[platform/kernel/linux-starfive.git] / drivers / ufs / core / ufshcd.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Universal Flash Storage Host controller driver Core
 * Copyright (C) 2011-2013 Samsung India Software Operations
 * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
 *
 * Authors:
 *      Santosh Yaraganavi <santosh.sy@samsung.com>
 *      Vinayak Holikatti <h.vinayak@samsung.com>
 */

#include <linux/async.h>
#include <linux/devfreq.h>
#include <linux/nls.h>
#include <linux/of.h>
#include <linux/bitfield.h>
#include <linux/blk-pm.h>
#include <linux/blkdev.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include "ufshcd-priv.h"
#include <ufs/ufs_quirks.h>
#include <ufs/unipro.h>
#include "ufs-sysfs.h"
#include "ufs-debugfs.h"
#include "ufs-fault-injection.h"
#include "ufs_bsg.h"
#include "ufshcd-crypto.h"
#include "ufshpb.h"
#include <asm/unaligned.h>

#define CREATE_TRACE_POINTS
#include <trace/events/ufs.h>

#define UFSHCD_ENABLE_INTRS     (UTP_TRANSFER_REQ_COMPL |\
                                 UTP_TASK_REQ_COMPL |\
                                 UFSHCD_ERROR_MASK)
/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT 500

/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES    10
/* Timeout after 50 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT    50 /* msecs */

/* Query request retries */
#define QUERY_REQ_RETRIES 3
/* Query request timeout */
#define QUERY_REQ_TIMEOUT 1500 /* 1.5 seconds */

/* Task management command timeout */
#define TM_CMD_TIMEOUT  100 /* msecs */

/* maximum number of retries for a general UIC command  */
#define UFS_UIC_COMMAND_RETRIES 3

/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3

/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5

/* Maximum number of error handler retries before giving up */
#define MAX_ERR_HANDLER_RETRIES 5

/* Expose the flag value from utp_upiu_query.value */
#define MASK_QUERY_UPIU_FLAG_LOC 0xFF

/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO 0x02

/* default delay of autosuspend: 2000 ms */
#define RPM_AUTOSUSPEND_DELAY_MS 2000

/* Default delay of RPM device flush delayed work */
#define RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS 5000

/* Default value of wait time before gating device ref clock */
#define UFSHCD_REF_CLK_GATING_WAIT_US 0xFF /* microsecs */

/* Polling time to wait for fDeviceInit */
#define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */

#define ufshcd_toggle_vreg(_dev, _vreg, _on)                            \
        ({                                                              \
                int _ret;                                               \
                if (_on)                                                \
                        _ret = ufshcd_enable_vreg(_dev, _vreg);         \
                else                                                    \
                        _ret = ufshcd_disable_vreg(_dev, _vreg);        \
                _ret;                                                   \
        })

#define ufshcd_hex_dump(prefix_str, buf, len) do {                       \
        size_t __len = (len);                                            \
        print_hex_dump(KERN_ERR, prefix_str,                             \
                       __len > 4 ? DUMP_PREFIX_OFFSET : DUMP_PREFIX_NONE,\
                       16, 4, buf, __len, false);                        \
} while (0)

int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
                     const char *prefix)
{
        u32 *regs;
        size_t pos;

        if (offset % 4 != 0 || len % 4 != 0) /* keep readl happy */
                return -EINVAL;

        regs = kzalloc(len, GFP_ATOMIC);
        if (!regs)
                return -ENOMEM;

        for (pos = 0; pos < len; pos += 4) {
                if (offset == 0 &&
                    pos >= REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER &&
                    pos <= REG_UIC_ERROR_CODE_DME)
                        continue;
                regs[pos / 4] = ufshcd_readl(hba, offset + pos);
        }

        ufshcd_hex_dump(prefix, regs, len);
        kfree(regs);

        return 0;
}
EXPORT_SYMBOL_GPL(ufshcd_dump_regs);

enum {
        UFSHCD_MAX_CHANNEL      = 0,
        UFSHCD_MAX_ID           = 1,
        UFSHCD_NUM_RESERVED     = 1,
        UFSHCD_CMD_PER_LUN      = 32 - UFSHCD_NUM_RESERVED,
        UFSHCD_CAN_QUEUE        = 32 - UFSHCD_NUM_RESERVED,
};

static const char *const ufshcd_state_name[] = {
        [UFSHCD_STATE_RESET]                    = "reset",
        [UFSHCD_STATE_OPERATIONAL]              = "operational",
        [UFSHCD_STATE_ERROR]                    = "error",
        [UFSHCD_STATE_EH_SCHEDULED_FATAL]       = "eh_fatal",
        [UFSHCD_STATE_EH_SCHEDULED_NON_FATAL]   = "eh_non_fatal",
};

/* UFSHCD error handling flags */
enum {
        UFSHCD_EH_IN_PROGRESS = (1 << 0),
};

/* UFSHCD UIC layer error flags */
enum {
        UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
        UFSHCD_UIC_DL_NAC_RECEIVED_ERROR = (1 << 1), /* Data link layer error */
        UFSHCD_UIC_DL_TCx_REPLAY_ERROR = (1 << 2), /* Data link layer error */
        UFSHCD_UIC_NL_ERROR = (1 << 3), /* Network layer error */
        UFSHCD_UIC_TL_ERROR = (1 << 4), /* Transport Layer error */
        UFSHCD_UIC_DME_ERROR = (1 << 5), /* DME error */
        UFSHCD_UIC_PA_GENERIC_ERROR = (1 << 6), /* Generic PA error */
};

#define ufshcd_set_eh_in_progress(h) \
        ((h)->eh_flags |= UFSHCD_EH_IN_PROGRESS)
#define ufshcd_eh_in_progress(h) \
        ((h)->eh_flags & UFSHCD_EH_IN_PROGRESS)
#define ufshcd_clear_eh_in_progress(h) \
        ((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)

const struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
        [UFS_PM_LVL_0] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
        [UFS_PM_LVL_1] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
        [UFS_PM_LVL_2] = {UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
        [UFS_PM_LVL_3] = {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
        [UFS_PM_LVL_4] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
        [UFS_PM_LVL_5] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
        /*
         * For DeepSleep, the link is first put in hibern8 and then off.
         * Leaving the link in hibern8 is not supported.
         */
        [UFS_PM_LVL_6] = {UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE},
};

static inline enum ufs_dev_pwr_mode
ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
{
        return ufs_pm_lvl_states[lvl].dev_state;
}

static inline enum uic_link_state
ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
{
        return ufs_pm_lvl_states[lvl].link_state;
}

static inline enum ufs_pm_level
ufs_get_desired_pm_lvl_for_dev_link_state(enum ufs_dev_pwr_mode dev_state,
                                        enum uic_link_state link_state)
{
        enum ufs_pm_level lvl;

        for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++) {
                if ((ufs_pm_lvl_states[lvl].dev_state == dev_state) &&
                        (ufs_pm_lvl_states[lvl].link_state == link_state))
                        return lvl;
        }

        /* if no match found, return the level 0 */
        return UFS_PM_LVL_0;
}

static const struct ufs_dev_quirk ufs_fixups[] = {
        /* UFS cards deviations table */
        { .wmanufacturerid = UFS_VENDOR_MICRON,
          .model = UFS_ANY_MODEL,
          .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
                   UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ },
        { .wmanufacturerid = UFS_VENDOR_SAMSUNG,
          .model = UFS_ANY_MODEL,
          .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
                   UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE |
                   UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS },
        { .wmanufacturerid = UFS_VENDOR_SKHYNIX,
          .model = UFS_ANY_MODEL,
          .quirk = UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME },
        { .wmanufacturerid = UFS_VENDOR_SKHYNIX,
          .model = "hB8aL1" /*H28U62301AMR*/,
          .quirk = UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME },
        { .wmanufacturerid = UFS_VENDOR_TOSHIBA,
          .model = UFS_ANY_MODEL,
          .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM },
        { .wmanufacturerid = UFS_VENDOR_TOSHIBA,
          .model = "THGLF2G9C8KBADG",
          .quirk = UFS_DEVICE_QUIRK_PA_TACTIVATE },
        { .wmanufacturerid = UFS_VENDOR_TOSHIBA,
          .model = "THGLF2G9D8KBADG",
          .quirk = UFS_DEVICE_QUIRK_PA_TACTIVATE },
        {}
};

static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
static void ufshcd_resume_clkscaling(struct ufs_hba *hba);
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
static int ufshcd_change_power_mode(struct ufs_hba *hba,
                             struct ufs_pa_layer_attr *pwr_mode);
static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
                                         struct ufs_vreg *vreg);
static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);

static inline void ufshcd_enable_irq(struct ufs_hba *hba)
{
        if (!hba->is_irq_enabled) {
                enable_irq(hba->irq);
                hba->is_irq_enabled = true;
        }
}

static inline void ufshcd_disable_irq(struct ufs_hba *hba)
{
        if (hba->is_irq_enabled) {
                disable_irq(hba->irq);
                hba->is_irq_enabled = false;
        }
}

static inline void ufshcd_wb_config(struct ufs_hba *hba)
{
        if (!ufshcd_is_wb_allowed(hba))
                return;

        ufshcd_wb_toggle(hba, true);

        ufshcd_wb_toggle_flush_during_h8(hba, true);
        if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
                ufshcd_wb_toggle_flush(hba, true);
}

static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba)
{
        if (atomic_dec_and_test(&hba->scsi_block_reqs_cnt))
                scsi_unblock_requests(hba->host);
}

static void ufshcd_scsi_block_requests(struct ufs_hba *hba)
{
        if (atomic_inc_return(&hba->scsi_block_reqs_cnt) == 1)
                scsi_block_requests(hba->host);
}

static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
                                      enum ufs_trace_str_t str_t)
{
        struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
        struct utp_upiu_header *header;

        if (!trace_ufshcd_upiu_enabled())
                return;

        if (str_t == UFS_CMD_SEND)
                header = &rq->header;
        else
                header = &hba->lrb[tag].ucd_rsp_ptr->header;

        trace_ufshcd_upiu(dev_name(hba->dev), str_t, header, &rq->sc.cdb,
                          UFS_TSF_CDB);
}

static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba,
                                        enum ufs_trace_str_t str_t,
                                        struct utp_upiu_req *rq_rsp)
{
        if (!trace_ufshcd_upiu_enabled())
                return;

        trace_ufshcd_upiu(dev_name(hba->dev), str_t, &rq_rsp->header,
                          &rq_rsp->qr, UFS_TSF_OSF);
}

static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
                                     enum ufs_trace_str_t str_t)
{
        struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[tag];

        if (!trace_ufshcd_upiu_enabled())
                return;

        if (str_t == UFS_TM_SEND)
                trace_ufshcd_upiu(dev_name(hba->dev), str_t,
                                  &descp->upiu_req.req_header,
                                  &descp->upiu_req.input_param1,
                                  UFS_TSF_TM_INPUT);
        else
                trace_ufshcd_upiu(dev_name(hba->dev), str_t,
                                  &descp->upiu_rsp.rsp_header,
                                  &descp->upiu_rsp.output_param1,
                                  UFS_TSF_TM_OUTPUT);
}

static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
                                         const struct uic_command *ucmd,
                                         enum ufs_trace_str_t str_t)
{
        u32 cmd;

        if (!trace_ufshcd_uic_command_enabled())
                return;

        if (str_t == UFS_CMD_SEND)
                cmd = ucmd->command;
        else
                cmd = ufshcd_readl(hba, REG_UIC_COMMAND);

        trace_ufshcd_uic_command(dev_name(hba->dev), str_t, cmd,
                                 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_1),
                                 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2),
                                 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3));
}

static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
                                     enum ufs_trace_str_t str_t)
{
        u64 lba = 0;
        u8 opcode = 0, group_id = 0;
        u32 intr, doorbell;
        struct ufshcd_lrb *lrbp = &hba->lrb[tag];
        struct scsi_cmnd *cmd = lrbp->cmd;
        struct request *rq = scsi_cmd_to_rq(cmd);
        int transfer_len = -1;

        if (!cmd)
                return;

        /* trace UPIU also */
        ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
        if (!trace_ufshcd_command_enabled())
                return;

        opcode = cmd->cmnd[0];

        if (opcode == READ_10 || opcode == WRITE_10) {
                /*
                 * Currently we only fully trace read(10) and write(10) commands
                 */
                transfer_len =
                       be32_to_cpu(lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
                lba = scsi_get_lba(cmd);
                if (opcode == WRITE_10)
                        group_id = lrbp->cmd->cmnd[6];
        } else if (opcode == UNMAP) {
                /*
                 * The number of Bytes to be unmapped beginning with the lba.
                 */
                transfer_len = blk_rq_bytes(rq);
                lba = scsi_get_lba(cmd);
        }

        intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
        doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
                        doorbell, transfer_len, intr, lba, opcode, group_id);
}

static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
{
        struct ufs_clk_info *clki;
        struct list_head *head = &hba->clk_list_head;

        if (list_empty(head))
                return;

        list_for_each_entry(clki, head, list) {
                if (!IS_ERR_OR_NULL(clki->clk) && clki->min_freq &&
                                clki->max_freq)
                        dev_err(hba->dev, "clk: %s, rate: %u\n",
                                        clki->name, clki->curr_freq);
        }
}

static void ufshcd_print_evt(struct ufs_hba *hba, u32 id,
                             const char *err_name)
{
        int i;
        bool found = false;
        const struct ufs_event_hist *e;

        if (id >= UFS_EVT_CNT)
                return;

        e = &hba->ufs_stats.event[id];

        for (i = 0; i < UFS_EVENT_HIST_LENGTH; i++) {
                int p = (i + e->pos) % UFS_EVENT_HIST_LENGTH;

                if (e->tstamp[p] == 0)
                        continue;
                dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, p,
                        e->val[p], ktime_to_us(e->tstamp[p]));
                found = true;
        }

        if (!found)
                dev_err(hba->dev, "No record of %s\n", err_name);
        else
                dev_err(hba->dev, "%s: total cnt=%llu\n", err_name, e->cnt);
}

static void ufshcd_print_evt_hist(struct ufs_hba *hba)
{
        ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");

        ufshcd_print_evt(hba, UFS_EVT_PA_ERR, "pa_err");
        ufshcd_print_evt(hba, UFS_EVT_DL_ERR, "dl_err");
        ufshcd_print_evt(hba, UFS_EVT_NL_ERR, "nl_err");
        ufshcd_print_evt(hba, UFS_EVT_TL_ERR, "tl_err");
        ufshcd_print_evt(hba, UFS_EVT_DME_ERR, "dme_err");
        ufshcd_print_evt(hba, UFS_EVT_AUTO_HIBERN8_ERR,
                         "auto_hibern8_err");
        ufshcd_print_evt(hba, UFS_EVT_FATAL_ERR, "fatal_err");
        ufshcd_print_evt(hba, UFS_EVT_LINK_STARTUP_FAIL,
                         "link_startup_fail");
        ufshcd_print_evt(hba, UFS_EVT_RESUME_ERR, "resume_fail");
        ufshcd_print_evt(hba, UFS_EVT_SUSPEND_ERR,
                         "suspend_fail");
        ufshcd_print_evt(hba, UFS_EVT_DEV_RESET, "dev_reset");
        ufshcd_print_evt(hba, UFS_EVT_HOST_RESET, "host_reset");
        ufshcd_print_evt(hba, UFS_EVT_ABORT, "task_abort");

        ufshcd_vops_dbg_register_dump(hba);
}

static
void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
{
        const struct ufshcd_lrb *lrbp;
        int prdt_length;
        int tag;

        for_each_set_bit(tag, &bitmap, hba->nutrs) {
                lrbp = &hba->lrb[tag];

                dev_err(hba->dev, "UPIU[%d] - issue time %lld us\n",
                                tag, ktime_to_us(lrbp->issue_time_stamp));
                dev_err(hba->dev, "UPIU[%d] - complete time %lld us\n",
                                tag, ktime_to_us(lrbp->compl_time_stamp));
                dev_err(hba->dev,
                        "UPIU[%d] - Transfer Request Descriptor phys@0x%llx\n",
                        tag, (u64)lrbp->utrd_dma_addr);

                ufshcd_hex_dump("UPIU TRD: ", lrbp->utr_descriptor_ptr,
                                sizeof(struct utp_transfer_req_desc));
                dev_err(hba->dev, "UPIU[%d] - Request UPIU phys@0x%llx\n", tag,
                        (u64)lrbp->ucd_req_dma_addr);
                ufshcd_hex_dump("UPIU REQ: ", lrbp->ucd_req_ptr,
                                sizeof(struct utp_upiu_req));
                dev_err(hba->dev, "UPIU[%d] - Response UPIU phys@0x%llx\n", tag,
                        (u64)lrbp->ucd_rsp_dma_addr);
                ufshcd_hex_dump("UPIU RSP: ", lrbp->ucd_rsp_ptr,
                                sizeof(struct utp_upiu_rsp));

                prdt_length = le16_to_cpu(
                        lrbp->utr_descriptor_ptr->prd_table_length);
                if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
                        prdt_length /= sizeof(struct ufshcd_sg_entry);

                dev_err(hba->dev,
                        "UPIU[%d] - PRDT - %d entries  phys@0x%llx\n",
                        tag, prdt_length,
                        (u64)lrbp->ucd_prdt_dma_addr);

                if (pr_prdt)
                        ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
                                sizeof(struct ufshcd_sg_entry) * prdt_length);
        }
}

static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
{
        int tag;

        for_each_set_bit(tag, &bitmap, hba->nutmrs) {
                struct utp_task_req_desc *tmrdp = &hba->utmrdl_base_addr[tag];

                dev_err(hba->dev, "TM[%d] - Task Management Header\n", tag);
                ufshcd_hex_dump("", tmrdp, sizeof(*tmrdp));
        }
}

static void ufshcd_print_host_state(struct ufs_hba *hba)
{
        const struct scsi_device *sdev_ufs = hba->ufs_device_wlun;

        dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
        dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n",
                hba->outstanding_reqs, hba->outstanding_tasks);
        dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
                hba->saved_err, hba->saved_uic_err);
        dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        dev_err(hba->dev, "PM in progress=%d, sys. suspended=%d\n",
                hba->pm_op_in_progress, hba->is_sys_suspended);
        dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
                hba->auto_bkops_enabled, hba->host->host_self_blocked);
        dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
        dev_err(hba->dev,
                "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n",
                ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
                hba->ufs_stats.hibern8_exit_cnt);
        dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n",
                ktime_to_us(hba->ufs_stats.last_intr_ts),
                hba->ufs_stats.last_intr_status);
        dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n",
                hba->eh_flags, hba->req_abort_count);
        dev_err(hba->dev, "hba->ufs_version=0x%x, Host capabilities=0x%x, caps=0x%x\n",
                hba->ufs_version, hba->capabilities, hba->caps);
        dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks,
                hba->dev_quirks);
        if (sdev_ufs)
                dev_err(hba->dev, "UFS dev info: %.8s %.16s rev %.4s\n",
                        sdev_ufs->vendor, sdev_ufs->model, sdev_ufs->rev);

        ufshcd_print_clk_freqs(hba);
}

/**
 * ufshcd_print_pwr_info - print power params as saved in hba
 * power info
 * @hba: per-adapter instance
 */
static void ufshcd_print_pwr_info(struct ufs_hba *hba)
{
        static const char * const names[] = {
                "INVALID MODE",
                "FAST MODE",
                "SLOW_MODE",
                "INVALID MODE",
                "FASTAUTO_MODE",
                "SLOWAUTO_MODE",
                "INVALID MODE",
        };

        /*
         * Using dev_dbg to avoid messages during runtime PM to avoid
         * never-ending cycles of messages written back to storage by user space
         * causing runtime resume, causing more messages and so on.
         */
        dev_dbg(hba->dev, "%s:[RX, TX]: gear=[%d, %d], lane[%d, %d], pwr[%s, %s], rate = %d\n",
                 __func__,
                 hba->pwr_info.gear_rx, hba->pwr_info.gear_tx,
                 hba->pwr_info.lane_rx, hba->pwr_info.lane_tx,
                 names[hba->pwr_info.pwr_rx],
                 names[hba->pwr_info.pwr_tx],
                 hba->pwr_info.hs_rate);
}

static void ufshcd_device_reset(struct ufs_hba *hba)
{
        int err;

        err = ufshcd_vops_device_reset(hba);

        if (!err) {
                ufshcd_set_ufs_dev_active(hba);
                if (ufshcd_is_wb_allowed(hba)) {
                        hba->dev_info.wb_enabled = false;
                        hba->dev_info.wb_buf_flush_enabled = false;
                }
        }
        if (err != -EOPNOTSUPP)
                ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, err);
}

void ufshcd_delay_us(unsigned long us, unsigned long tolerance)
{
        if (!us)
                return;

        if (us < 10)
                udelay(us);
        else
                usleep_range(us, us + tolerance);
}
EXPORT_SYMBOL_GPL(ufshcd_delay_us);

/**
 * ufshcd_wait_for_register - wait for register value to change
 * @hba: per-adapter interface
 * @reg: mmio register offset
 * @mask: mask to apply to the read register value
 * @val: value to wait for
 * @interval_us: polling interval in microseconds
 * @timeout_ms: timeout in milliseconds
 *
 * Return:
 * -ETIMEDOUT on error, zero on success.
 */
static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
                                u32 val, unsigned long interval_us,
                                unsigned long timeout_ms)
{
        int err = 0;
        unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

        /* ignore bits that we don't intend to wait on */
        val = val & mask;

        while ((ufshcd_readl(hba, reg) & mask) != val) {
                usleep_range(interval_us, interval_us + 50);
                if (time_after(jiffies, timeout)) {
                        if ((ufshcd_readl(hba, reg) & mask) != val)
                                err = -ETIMEDOUT;
                        break;
                }
        }

        return err;
}

/**
 * ufshcd_get_intr_mask - Get the interrupt bit mask
 * @hba: Pointer to adapter instance
 *
 * Returns interrupt bit mask per version
 */
static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
{
        if (hba->ufs_version == ufshci_version(1, 0))
                return INTERRUPT_MASK_ALL_VER_10;
        if (hba->ufs_version <= ufshci_version(2, 0))
                return INTERRUPT_MASK_ALL_VER_11;

        return INTERRUPT_MASK_ALL_VER_21;
}

/**
 * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 * @hba: Pointer to adapter instance
 *
 * Returns UFSHCI version supported by the controller
 */
static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
{
        u32 ufshci_ver;

        if (hba->quirks & UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION)
                ufshci_ver = ufshcd_vops_get_ufs_hci_version(hba);
        else
                ufshci_ver = ufshcd_readl(hba, REG_UFS_VERSION);

        /*
         * UFSHCI v1.x uses a different version scheme, in order
         * to allow the use of comparisons with the ufshci_version
         * function, we convert it to the same scheme as ufs 2.0+.
         */
        if (ufshci_ver & 0x00010000)
                return ufshci_version(1, ufshci_ver & 0x00000100);

        return ufshci_ver;
}

/**
 * ufshcd_is_device_present - Check if any device connected to
 *                            the host controller
 * @hba: pointer to adapter instance
 *
 * Returns true if device present, false if no device detected
 */
static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
{
        return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & DEVICE_PRESENT;
}

/**
 * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 * @lrbp: pointer to local command reference block
 *
 * This function is used to get the OCS field from UTRD
 * Returns the OCS field in the UTRD
 */
static enum utp_ocs ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
{
        return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
}

/**
 * ufshcd_utrl_clear() - Clear requests from the controller request list.
 * @hba: per adapter instance
 * @mask: mask with one bit set for each request to be cleared
 */
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 mask)
{
        if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
                mask = ~mask;
        /*
         * From the UFSHCI specification: "UTP Transfer Request List CLear
         * Register (UTRLCLR): This field is bit significant. Each bit
         * corresponds to a slot in the UTP Transfer Request List, where bit 0
         * corresponds to request slot 0. A bit in this field is set to ‘0’
         * by host software to indicate to the host controller that a transfer
         * request slot is cleared. The host controller
         * shall free up any resources associated to the request slot
         * immediately, and shall set the associated bit in UTRLDBR to ‘0’. The
         * host software indicates no change to request slots by setting the
         * associated bits in this field to ‘1’. Bits in this field shall only
         * be set ‘1’ or ‘0’ by host software when UTRLRSR is set to ‘1’."
         */
        ufshcd_writel(hba, ~mask, REG_UTP_TRANSFER_REQ_LIST_CLEAR);
}

/**
 * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
{
        if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
                ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
        else
                ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
}

/**
 * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 * @reg: Register value of host controller status
 *
 * Returns integer, 0 on Success and positive value if failed
 */
static inline int ufshcd_get_lists_status(u32 reg)
{
        return !((reg & UFSHCD_STATUS_READY) == UFSHCD_STATUS_READY);
}

/**
 * ufshcd_get_uic_cmd_result - Get the UIC command result
 * @hba: Pointer to adapter instance
 *
 * This function gets the result of UIC command completion
 * Returns 0 on success, non zero value on error
 */
static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
{
        return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
               MASK_UIC_COMMAND_RESULT;
}

/**
 * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 * @hba: Pointer to adapter instance
 *
 * This function gets UIC command argument3
 * Returns 0 on success, non zero value on error
 */
static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
{
        return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
}

/**
 * ufshcd_get_req_rsp - returns the TR response transaction type
 * @ucd_rsp_ptr: pointer to response UPIU
 */
static inline int
ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
{
        return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
}

/**
 * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * This function gets the response status and scsi_status from response UPIU
 * Returns the response result code.
 */
static inline int
ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
{
        return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
}

/*
 * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 *                              from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * Return the data segment length.
 */
static inline unsigned int
ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
{
        return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
                MASK_RSP_UPIU_DATA_SEG_LEN;
}

/**
 * ufshcd_is_exception_event - Check if the device raised an exception event
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * The function checks if the device raised an exception event indicated in
 * the Device Information field of response UPIU.
 *
 * Returns true if exception is raised, false otherwise.
 */
static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
{
        return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
                        MASK_RSP_EXCEPTION_EVENT;
}

/**
 * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
 * @hba: per adapter instance
 */
static inline void
ufshcd_reset_intr_aggr(struct ufs_hba *hba)
{
        ufshcd_writel(hba, INT_AGGR_ENABLE |
                      INT_AGGR_COUNTER_AND_TIMER_RESET,
                      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 * @hba: per adapter instance
 * @cnt: Interrupt aggregation counter threshold
 * @tmout: Interrupt aggregation timeout value
 */
static inline void
ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
{
        ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
                      INT_AGGR_COUNTER_THLD_VAL(cnt) |
                      INT_AGGR_TIMEOUT_VAL(tmout),
                      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_disable_intr_aggr - Disables interrupt aggregation.
 * @hba: per adapter instance
 */
static inline void ufshcd_disable_intr_aggr(struct ufs_hba *hba)
{
        ufshcd_writel(hba, 0, REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 *                      When run-stop registers are set to 1, it indicates the
 *                      host controller that it can process the requests
 * @hba: per adapter instance
 */
static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
{
        ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
                      REG_UTP_TASK_REQ_LIST_RUN_STOP);
        ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
                      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
}

/**
 * ufshcd_hba_start - Start controller initialization sequence
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_start(struct ufs_hba *hba)
{
        u32 val = CONTROLLER_ENABLE;

        if (ufshcd_crypto_enable(hba))
                val |= CRYPTO_GENERAL_ENABLE;

        ufshcd_writel(hba, val, REG_CONTROLLER_ENABLE);
}

/**
 * ufshcd_is_hba_active - Get controller state
 * @hba: per adapter instance
 *
 * Returns true if and only if the controller is active.
 */
static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
{
        return ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE;
}

u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
{
        /* HCI version 1.0 and 1.1 supports UniPro 1.41 */
        if (hba->ufs_version <= ufshci_version(1, 1))
                return UFS_UNIPRO_VER_1_41;
        else
                return UFS_UNIPRO_VER_1_6;
}
EXPORT_SYMBOL(ufshcd_get_local_unipro_ver);

static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
{
        /*
         * If both host and device support UniPro ver1.6 or later, PA layer
         * parameters tuning happens during link startup itself.
         *
         * We can manually tune PA layer parameters if either host or device
         * doesn't support UniPro ver 1.6 or later. But to keep manual tuning
         * logic simple, we will only do manual tuning if local unipro version
         * doesn't support ver1.6 or later.
         */
        return ufshcd_get_local_unipro_ver(hba) < UFS_UNIPRO_VER_1_6;
}

/**
 * ufshcd_set_clk_freq - set UFS controller clock frequencies
 * @hba: per adapter instance
 * @scale_up: If True, set max possible frequency othewise set low frequency
 *
 * Returns 0 if successful
 * Returns < 0 for any other errors
 */
static int ufshcd_set_clk_freq(struct ufs_hba *hba, bool scale_up)
{
        int ret = 0;
        struct ufs_clk_info *clki;
        struct list_head *head = &hba->clk_list_head;

        if (list_empty(head))
                goto out;

        list_for_each_entry(clki, head, list) {
                if (!IS_ERR_OR_NULL(clki->clk)) {
                        if (scale_up && clki->max_freq) {
                                if (clki->curr_freq == clki->max_freq)
                                        continue;

                                ret = clk_set_rate(clki->clk, clki->max_freq);
                                if (ret) {
                                        dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
                                                __func__, clki->name,
                                                clki->max_freq, ret);
                                        break;
                                }
                                trace_ufshcd_clk_scaling(dev_name(hba->dev),
                                                "scaled up", clki->name,
                                                clki->curr_freq,
                                                clki->max_freq);

                                clki->curr_freq = clki->max_freq;

                        } else if (!scale_up && clki->min_freq) {
                                if (clki->curr_freq == clki->min_freq)
                                        continue;

                                ret = clk_set_rate(clki->clk, clki->min_freq);
                                if (ret) {
                                        dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
                                                __func__, clki->name,
                                                clki->min_freq, ret);
                                        break;
                                }
                                trace_ufshcd_clk_scaling(dev_name(hba->dev),
                                                "scaled down", clki->name,
                                                clki->curr_freq,
                                                clki->min_freq);
                                clki->curr_freq = clki->min_freq;
                        }
                }
                dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
                                clki->name, clk_get_rate(clki->clk));
        }

out:
        return ret;
}

/**
 * ufshcd_scale_clks - scale up or scale down UFS controller clocks
 * @hba: per adapter instance
 * @scale_up: True if scaling up and false if scaling down
 *
 * Returns 0 if successful
 * Returns < 0 for any other errors
 */
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
{
        int ret = 0;
        ktime_t start = ktime_get();

        ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
        if (ret)
                goto out;

        ret = ufshcd_set_clk_freq(hba, scale_up);
        if (ret)
                goto out;

        ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
        if (ret)
                ufshcd_set_clk_freq(hba, !scale_up);

out:
        trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
                        (scale_up ? "up" : "down"),
                        ktime_to_us(ktime_sub(ktime_get(), start)), ret);
        return ret;
}

/**
 * ufshcd_is_devfreq_scaling_required - check if scaling is required or not
 * @hba: per adapter instance
 * @scale_up: True if scaling up and false if scaling down
 *
 * Returns true if scaling is required, false otherwise.
 */
static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba,
                                               bool scale_up)
{
        struct ufs_clk_info *clki;
        struct list_head *head = &hba->clk_list_head;

        if (list_empty(head))
                return false;

        list_for_each_entry(clki, head, list) {
                if (!IS_ERR_OR_NULL(clki->clk)) {
                        if (scale_up && clki->max_freq) {
                                if (clki->curr_freq == clki->max_freq)
                                        continue;
                                return true;
                        } else if (!scale_up && clki->min_freq) {
                                if (clki->curr_freq == clki->min_freq)
                                        continue;
                                return true;
                        }
                }
        }

        return false;
}

/*
 * Determine the number of pending commands by counting the bits in the SCSI
 * device budget maps. This approach has been selected because a bit is set in
 * the budget map before scsi_host_queue_ready() checks the host_self_blocked
 * flag. The host_self_blocked flag can be modified by calling
 * scsi_block_requests() or scsi_unblock_requests().
 */
static u32 ufshcd_pending_cmds(struct ufs_hba *hba)
{
        const struct scsi_device *sdev;
        u32 pending = 0;

        lockdep_assert_held(hba->host->host_lock);
        __shost_for_each_device(sdev, hba->host)
                pending += sbitmap_weight(&sdev->budget_map);

        return pending;
}

static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba,
                                        u64 wait_timeout_us)
{
        unsigned long flags;
        int ret = 0;
        u32 tm_doorbell;
        u32 tr_pending;
        bool timeout = false, do_last_check = false;
        ktime_t start;

        ufshcd_hold(hba, false);
        spin_lock_irqsave(hba->host->host_lock, flags);
        /*
         * Wait for all the outstanding tasks/transfer requests.
         * Verify by checking the doorbell registers are clear.
         */
        start = ktime_get();
        do {
                if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) {
                        ret = -EBUSY;
                        goto out;
                }

                tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
                tr_pending = ufshcd_pending_cmds(hba);
                if (!tm_doorbell && !tr_pending) {
                        timeout = false;
                        break;
                } else if (do_last_check) {
                        break;
                }

                spin_unlock_irqrestore(hba->host->host_lock, flags);
                schedule();
                if (ktime_to_us(ktime_sub(ktime_get(), start)) >
                    wait_timeout_us) {
                        timeout = true;
                        /*
                         * We might have scheduled out for long time so make
                         * sure to check if doorbells are cleared by this time
                         * or not.
                         */
                        do_last_check = true;
                }
                spin_lock_irqsave(hba->host->host_lock, flags);
        } while (tm_doorbell || tr_pending);

        if (timeout) {
                dev_err(hba->dev,
                        "%s: timedout waiting for doorbell to clear (tm=0x%x, tr=0x%x)\n",
                        __func__, tm_doorbell, tr_pending);
                ret = -EBUSY;
        }
out:
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        ufshcd_release(hba);
        return ret;
}

/**
 * ufshcd_scale_gear - scale up/down UFS gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up gear and false for scaling down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_scale_gear(struct ufs_hba *hba, bool scale_up)
{
        int ret = 0;
        struct ufs_pa_layer_attr new_pwr_info;

        if (scale_up) {
                memcpy(&new_pwr_info, &hba->clk_scaling.saved_pwr_info.info,
                       sizeof(struct ufs_pa_layer_attr));
        } else {
                memcpy(&new_pwr_info, &hba->pwr_info,
                       sizeof(struct ufs_pa_layer_attr));

                if (hba->pwr_info.gear_tx > hba->clk_scaling.min_gear ||
                    hba->pwr_info.gear_rx > hba->clk_scaling.min_gear) {
                        /* save the current power mode */
                        memcpy(&hba->clk_scaling.saved_pwr_info.info,
                                &hba->pwr_info,
                                sizeof(struct ufs_pa_layer_attr));

                        /* scale down gear */
                        new_pwr_info.gear_tx = hba->clk_scaling.min_gear;
                        new_pwr_info.gear_rx = hba->clk_scaling.min_gear;
                }
        }

        /* check if the power mode needs to be changed or not? */
        ret = ufshcd_config_pwr_mode(hba, &new_pwr_info);
        if (ret)
                dev_err(hba->dev, "%s: failed err %d, old gear: (tx %d rx %d), new gear: (tx %d rx %d)",
                        __func__, ret,
                        hba->pwr_info.gear_tx, hba->pwr_info.gear_rx,
                        new_pwr_info.gear_tx, new_pwr_info.gear_rx);

        return ret;
}

static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba)
{
        #define DOORBELL_CLR_TOUT_US            (1000 * 1000) /* 1 sec */
        int ret = 0;
        /*
         * make sure that there are no outstanding requests when
         * clock scaling is in progress
         */
        ufshcd_scsi_block_requests(hba);
        down_write(&hba->clk_scaling_lock);

        if (!hba->clk_scaling.is_allowed ||
            ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
                ret = -EBUSY;
                up_write(&hba->clk_scaling_lock);
                ufshcd_scsi_unblock_requests(hba);
                goto out;
        }

        /* let's not get into low power until clock scaling is completed */
        ufshcd_hold(hba, false);

out:
        return ret;
}

static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba, bool writelock)
{
        if (writelock)
                up_write(&hba->clk_scaling_lock);
        else
                up_read(&hba->clk_scaling_lock);
        ufshcd_scsi_unblock_requests(hba);
        ufshcd_release(hba);
}

/**
 * ufshcd_devfreq_scale - scale up/down UFS clocks and gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up and false for scalin down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
{
        int ret = 0;
        bool is_writelock = true;

        ret = ufshcd_clock_scaling_prepare(hba);
        if (ret)
                return ret;

        /* scale down the gear before scaling down clocks */
        if (!scale_up) {
                ret = ufshcd_scale_gear(hba, false);
                if (ret)
                        goto out_unprepare;
        }

        ret = ufshcd_scale_clks(hba, scale_up);
        if (ret) {
                if (!scale_up)
                        ufshcd_scale_gear(hba, true);
                goto out_unprepare;
        }

        /* scale up the gear after scaling up clocks */
        if (scale_up) {
                ret = ufshcd_scale_gear(hba, true);
                if (ret) {
                        ufshcd_scale_clks(hba, false);
                        goto out_unprepare;
                }
        }

        /* Enable Write Booster if we have scaled up else disable it */
        downgrade_write(&hba->clk_scaling_lock);
        is_writelock = false;
        ufshcd_wb_toggle(hba, scale_up);

out_unprepare:
        ufshcd_clock_scaling_unprepare(hba, is_writelock);
        return ret;
}

static void ufshcd_clk_scaling_suspend_work(struct work_struct *work)
{
        struct ufs_hba *hba = container_of(work, struct ufs_hba,
                                           clk_scaling.suspend_work);
        unsigned long irq_flags;

        spin_lock_irqsave(hba->host->host_lock, irq_flags);
        if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) {
                spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
                return;
        }
        hba->clk_scaling.is_suspended = true;
        spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

        __ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_clk_scaling_resume_work(struct work_struct *work)
{
        struct ufs_hba *hba = container_of(work, struct ufs_hba,
                                           clk_scaling.resume_work);
        unsigned long irq_flags;

        spin_lock_irqsave(hba->host->host_lock, irq_flags);
        if (!hba->clk_scaling.is_suspended) {
                spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
                return;
        }
        hba->clk_scaling.is_suspended = false;
        spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

        devfreq_resume_device(hba->devfreq);
}

static int ufshcd_devfreq_target(struct device *dev,
                                unsigned long *freq, u32 flags)
{
        int ret = 0;
        struct ufs_hba *hba = dev_get_drvdata(dev);
        ktime_t start;
        bool scale_up, sched_clk_scaling_suspend_work = false;
        struct list_head *clk_list = &hba->clk_list_head;
        struct ufs_clk_info *clki;
        unsigned long irq_flags;

        if (!ufshcd_is_clkscaling_supported(hba))
                return -EINVAL;

        clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
        /* Override with the closest supported frequency */
        *freq = (unsigned long) clk_round_rate(clki->clk, *freq);
        spin_lock_irqsave(hba->host->host_lock, irq_flags);
        if (ufshcd_eh_in_progress(hba)) {
                spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
                return 0;
        }

        if (!hba->clk_scaling.active_reqs)
                sched_clk_scaling_suspend_work = true;

        if (list_empty(clk_list)) {
                spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
                goto out;
        }

        /* Decide based on the rounded-off frequency and update */
        scale_up = *freq == clki->max_freq;
        if (!scale_up)
                *freq = clki->min_freq;
        /* Update the frequency */
        if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
                spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
                ret = 0;
                goto out; /* no state change required */
        }
        spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

        start = ktime_get();
        ret = ufshcd_devfreq_scale(hba, scale_up);

        trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
                (scale_up ? "up" : "down"),
                ktime_to_us(ktime_sub(ktime_get(), start)), ret);

out:
        if (sched_clk_scaling_suspend_work)
                queue_work(hba->clk_scaling.workq,
                           &hba->clk_scaling.suspend_work);

        return ret;
}

static int ufshcd_devfreq_get_dev_status(struct device *dev,
                struct devfreq_dev_status *stat)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        struct ufs_clk_scaling *scaling = &hba->clk_scaling;
        unsigned long flags;
        struct list_head *clk_list = &hba->clk_list_head;
        struct ufs_clk_info *clki;
        ktime_t curr_t;

        if (!ufshcd_is_clkscaling_supported(hba))
                return -EINVAL;

        memset(stat, 0, sizeof(*stat));

        spin_lock_irqsave(hba->host->host_lock, flags);
        curr_t = ktime_get();
        if (!scaling->window_start_t)
                goto start_window;

        clki = list_first_entry(clk_list, struct ufs_clk_info, list);
        /*
         * If current frequency is 0, then the ondemand governor considers
         * there's no initial frequency set. And it always requests to set
         * to max. frequency.
         */
        stat->current_frequency = clki->curr_freq;
        if (scaling->is_busy_started)
                scaling->tot_busy_t += ktime_us_delta(curr_t,
                                scaling->busy_start_t);

        stat->total_time = ktime_us_delta(curr_t, scaling->window_start_t);
        stat->busy_time = scaling->tot_busy_t;
start_window:
        scaling->window_start_t = curr_t;
        scaling->tot_busy_t = 0;

        if (hba->outstanding_reqs) {
                scaling->busy_start_t = curr_t;
                scaling->is_busy_started = true;
        } else {
                scaling->busy_start_t = 0;
                scaling->is_busy_started = false;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        return 0;
}

static int ufshcd_devfreq_init(struct ufs_hba *hba)
{
        struct list_head *clk_list = &hba->clk_list_head;
        struct ufs_clk_info *clki;
        struct devfreq *devfreq;
        int ret;

        /* Skip devfreq if we don't have any clocks in the list */
        if (list_empty(clk_list))
                return 0;

        clki = list_first_entry(clk_list, struct ufs_clk_info, list);
        dev_pm_opp_add(hba->dev, clki->min_freq, 0);
        dev_pm_opp_add(hba->dev, clki->max_freq, 0);

        ufshcd_vops_config_scaling_param(hba, &hba->vps->devfreq_profile,
                                         &hba->vps->ondemand_data);
        devfreq = devfreq_add_device(hba->dev,
                        &hba->vps->devfreq_profile,
                        DEVFREQ_GOV_SIMPLE_ONDEMAND,
                        &hba->vps->ondemand_data);
        if (IS_ERR(devfreq)) {
                ret = PTR_ERR(devfreq);
                dev_err(hba->dev, "Unable to register with devfreq %d\n", ret);

                dev_pm_opp_remove(hba->dev, clki->min_freq);
                dev_pm_opp_remove(hba->dev, clki->max_freq);
                return ret;
        }

        hba->devfreq = devfreq;

        return 0;
}

static void ufshcd_devfreq_remove(struct ufs_hba *hba)
{
        struct list_head *clk_list = &hba->clk_list_head;
        struct ufs_clk_info *clki;

        if (!hba->devfreq)
                return;

        devfreq_remove_device(hba->devfreq);
        hba->devfreq = NULL;

        clki = list_first_entry(clk_list, struct ufs_clk_info, list);
        dev_pm_opp_remove(hba->dev, clki->min_freq);
        dev_pm_opp_remove(hba->dev, clki->max_freq);
}

static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
        unsigned long flags;

        devfreq_suspend_device(hba->devfreq);
        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->clk_scaling.window_start_t = 0;
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
        unsigned long flags;
        bool suspend = false;

        cancel_work_sync(&hba->clk_scaling.suspend_work);
        cancel_work_sync(&hba->clk_scaling.resume_work);

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (!hba->clk_scaling.is_suspended) {
                suspend = true;
                hba->clk_scaling.is_suspended = true;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (suspend)
                __ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
{
        unsigned long flags;
        bool resume = false;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (hba->clk_scaling.is_suspended) {
                resume = true;
                hba->clk_scaling.is_suspended = false;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (resume)
                devfreq_resume_device(hba->devfreq);
}

static ssize_t ufshcd_clkscale_enable_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%d\n", hba->clk_scaling.is_enabled);
}

static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        u32 value;
        int err = 0;

        if (kstrtou32(buf, 0, &value))
                return -EINVAL;

        down(&hba->host_sem);
        if (!ufshcd_is_user_access_allowed(hba)) {
                err = -EBUSY;
                goto out;
        }

        value = !!value;
        if (value == hba->clk_scaling.is_enabled)
                goto out;

        ufshcd_rpm_get_sync(hba);
        ufshcd_hold(hba, false);

        hba->clk_scaling.is_enabled = value;

        if (value) {
                ufshcd_resume_clkscaling(hba);
        } else {
                ufshcd_suspend_clkscaling(hba);
                err = ufshcd_devfreq_scale(hba, true);
                if (err)
                        dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
                                        __func__, err);
        }

        ufshcd_release(hba);
        ufshcd_rpm_put_sync(hba);
out:
        up(&hba->host_sem);
        return err ? err : count;
}

static void ufshcd_init_clk_scaling_sysfs(struct ufs_hba *hba)
{
        hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
        hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
        sysfs_attr_init(&hba->clk_scaling.enable_attr.attr);
        hba->clk_scaling.enable_attr.attr.name = "clkscale_enable";
        hba->clk_scaling.enable_attr.attr.mode = 0644;
        if (device_create_file(hba->dev, &hba->clk_scaling.enable_attr))
                dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
}

static void ufshcd_remove_clk_scaling_sysfs(struct ufs_hba *hba)
{
        if (hba->clk_scaling.enable_attr.attr.name)
                device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
}

static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
{
        char wq_name[sizeof("ufs_clkscaling_00")];

        if (!ufshcd_is_clkscaling_supported(hba))
                return;

        if (!hba->clk_scaling.min_gear)
                hba->clk_scaling.min_gear = UFS_HS_G1;

        INIT_WORK(&hba->clk_scaling.suspend_work,
                  ufshcd_clk_scaling_suspend_work);
        INIT_WORK(&hba->clk_scaling.resume_work,
                  ufshcd_clk_scaling_resume_work);

        snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
                 hba->host->host_no);
        hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);

        hba->clk_scaling.is_initialized = true;
}

static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
{
        if (!hba->clk_scaling.is_initialized)
                return;

        ufshcd_remove_clk_scaling_sysfs(hba);
        destroy_workqueue(hba->clk_scaling.workq);
        ufshcd_devfreq_remove(hba);
        hba->clk_scaling.is_initialized = false;
}

static void ufshcd_ungate_work(struct work_struct *work)
{
        int ret;
        unsigned long flags;
        struct ufs_hba *hba = container_of(work, struct ufs_hba,
                        clk_gating.ungate_work);

        cancel_delayed_work_sync(&hba->clk_gating.gate_work);

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (hba->clk_gating.state == CLKS_ON) {
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                goto unblock_reqs;
        }

        spin_unlock_irqrestore(hba->host->host_lock, flags);
        ufshcd_hba_vreg_set_hpm(hba);
        ufshcd_setup_clocks(hba, true);

        ufshcd_enable_irq(hba);

        /* Exit from hibern8 */
        if (ufshcd_can_hibern8_during_gating(hba)) {
                /* Prevent gating in this path */
                hba->clk_gating.is_suspended = true;
                if (ufshcd_is_link_hibern8(hba)) {
                        ret = ufshcd_uic_hibern8_exit(hba);
                        if (ret)
                                dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
                                        __func__, ret);
                        else
                                ufshcd_set_link_active(hba);
                }
                hba->clk_gating.is_suspended = false;
        }
unblock_reqs:
        ufshcd_scsi_unblock_requests(hba);
}

/**
 * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 * Also, exit from hibern8 mode and set the link as active.
 * @hba: per adapter instance
 * @async: This indicates whether caller should ungate clocks asynchronously.
 */
int ufshcd_hold(struct ufs_hba *hba, bool async)
{
        int rc = 0;
        bool flush_result;
        unsigned long flags;

        if (!ufshcd_is_clkgating_allowed(hba) ||
            !hba->clk_gating.is_initialized)
                goto out;
        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->clk_gating.active_reqs++;

start:
        switch (hba->clk_gating.state) {
        case CLKS_ON:
                /*
                 * Wait for the ungate work to complete if in progress.
                 * Though the clocks may be in ON state, the link could
                 * still be in hibner8 state if hibern8 is allowed
                 * during clock gating.
                 * Make sure we exit hibern8 state also in addition to
                 * clocks being ON.
                 */
                if (ufshcd_can_hibern8_during_gating(hba) &&
                    ufshcd_is_link_hibern8(hba)) {
                        if (async) {
                                rc = -EAGAIN;
                                hba->clk_gating.active_reqs--;
                                break;
                        }
                        spin_unlock_irqrestore(hba->host->host_lock, flags);
                        flush_result = flush_work(&hba->clk_gating.ungate_work);
                        if (hba->clk_gating.is_suspended && !flush_result)
                                goto out;
                        spin_lock_irqsave(hba->host->host_lock, flags);
                        goto start;
                }
                break;
        case REQ_CLKS_OFF:
                if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
                        hba->clk_gating.state = CLKS_ON;
                        trace_ufshcd_clk_gating(dev_name(hba->dev),
                                                hba->clk_gating.state);
                        break;
                }
                /*
                 * If we are here, it means gating work is either done or
                 * currently running. Hence, fall through to cancel gating
                 * work and to enable clocks.
                 */
                fallthrough;
        case CLKS_OFF:
                hba->clk_gating.state = REQ_CLKS_ON;
                trace_ufshcd_clk_gating(dev_name(hba->dev),
                                        hba->clk_gating.state);
                if (queue_work(hba->clk_gating.clk_gating_workq,
                               &hba->clk_gating.ungate_work))
                        ufshcd_scsi_block_requests(hba);
                /*
                 * fall through to check if we should wait for this
                 * work to be done or not.
                 */
                fallthrough;
        case REQ_CLKS_ON:
                if (async) {
                        rc = -EAGAIN;
                        hba->clk_gating.active_reqs--;
                        break;
                }

                spin_unlock_irqrestore(hba->host->host_lock, flags);
                flush_work(&hba->clk_gating.ungate_work);
                /* Make sure state is CLKS_ON before returning */
                spin_lock_irqsave(hba->host->host_lock, flags);
                goto start;
        default:
                dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
                                __func__, hba->clk_gating.state);
                break;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
        return rc;
}
EXPORT_SYMBOL_GPL(ufshcd_hold);

static void ufshcd_gate_work(struct work_struct *work)
{
        struct ufs_hba *hba = container_of(work, struct ufs_hba,
                        clk_gating.gate_work.work);
        unsigned long flags;
        int ret;

        spin_lock_irqsave(hba->host->host_lock, flags);
        /*
         * In case you are here to cancel this work the gating state
         * would be marked as REQ_CLKS_ON. In this case save time by
         * skipping the gating work and exit after changing the clock
         * state to CLKS_ON.
         */
        if (hba->clk_gating.is_suspended ||
                (hba->clk_gating.state != REQ_CLKS_OFF)) {
                hba->clk_gating.state = CLKS_ON;
                trace_ufshcd_clk_gating(dev_name(hba->dev),
                                        hba->clk_gating.state);
                goto rel_lock;
        }

        if (hba->clk_gating.active_reqs
                || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
                || hba->outstanding_reqs || hba->outstanding_tasks
                || hba->active_uic_cmd || hba->uic_async_done)
                goto rel_lock;

        spin_unlock_irqrestore(hba->host->host_lock, flags);

        /* put the link into hibern8 mode before turning off clocks */
        if (ufshcd_can_hibern8_during_gating(hba)) {
                ret = ufshcd_uic_hibern8_enter(hba);
                if (ret) {
                        hba->clk_gating.state = CLKS_ON;
                        dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
                                        __func__, ret);
                        trace_ufshcd_clk_gating(dev_name(hba->dev),
                                                hba->clk_gating.state);
                        goto out;
                }
                ufshcd_set_link_hibern8(hba);
        }

        ufshcd_disable_irq(hba);

        ufshcd_setup_clocks(hba, false);

        /* Put the host controller in low power mode if possible */
        ufshcd_hba_vreg_set_lpm(hba);
        /*
         * In case you are here to cancel this work the gating state
         * would be marked as REQ_CLKS_ON. In this case keep the state
         * as REQ_CLKS_ON which would anyway imply that clocks are off
         * and a request to turn them on is pending. By doing this way,
         * we keep the state machine in tact and this would ultimately
         * prevent from doing cancel work multiple times when there are
         * new requests arriving before the current cancel work is done.
         */
        spin_lock_irqsave(hba->host->host_lock, flags);
        if (hba->clk_gating.state == REQ_CLKS_OFF) {
                hba->clk_gating.state = CLKS_OFF;
                trace_ufshcd_clk_gating(dev_name(hba->dev),
                                        hba->clk_gating.state);
        }
rel_lock:
        spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
        return;
}

/* host lock must be held before calling this variant */
static void __ufshcd_release(struct ufs_hba *hba)
{
        if (!ufshcd_is_clkgating_allowed(hba))
                return;

        hba->clk_gating.active_reqs--;

        if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended ||
            hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL ||
            hba->outstanding_tasks || !hba->clk_gating.is_initialized ||
            hba->active_uic_cmd || hba->uic_async_done ||
            hba->clk_gating.state == CLKS_OFF)
                return;

        hba->clk_gating.state = REQ_CLKS_OFF;
        trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
        queue_delayed_work(hba->clk_gating.clk_gating_workq,
                           &hba->clk_gating.gate_work,
                           msecs_to_jiffies(hba->clk_gating.delay_ms));
}

void ufshcd_release(struct ufs_hba *hba)
{
        unsigned long flags;

        spin_lock_irqsave(hba->host->host_lock, flags);
        __ufshcd_release(hba);
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}
EXPORT_SYMBOL_GPL(ufshcd_release);

static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%lu\n", hba->clk_gating.delay_ms);
}

void ufshcd_clkgate_delay_set(struct device *dev, unsigned long value)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        unsigned long flags;

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->clk_gating.delay_ms = value;
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}
EXPORT_SYMBOL_GPL(ufshcd_clkgate_delay_set);

static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        unsigned long value;

        if (kstrtoul(buf, 0, &value))
                return -EINVAL;

        ufshcd_clkgate_delay_set(dev, value);
        return count;
}

static ssize_t ufshcd_clkgate_enable_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%d\n", hba->clk_gating.is_enabled);
}

static ssize_t ufshcd_clkgate_enable_store(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        unsigned long flags;
        u32 value;

        if (kstrtou32(buf, 0, &value))
                return -EINVAL;

        value = !!value;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (value == hba->clk_gating.is_enabled)
                goto out;

        if (value)
                __ufshcd_release(hba);
        else
                hba->clk_gating.active_reqs++;

        hba->clk_gating.is_enabled = value;
out:
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        return count;
}

static void ufshcd_init_clk_gating_sysfs(struct ufs_hba *hba)
{
        hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
        hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
        sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
        hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
        hba->clk_gating.delay_attr.attr.mode = 0644;
        if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
                dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");

        hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
        hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
        sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
        hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
        hba->clk_gating.enable_attr.attr.mode = 0644;
        if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
                dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
}

static void ufshcd_remove_clk_gating_sysfs(struct ufs_hba *hba)
{
        if (hba->clk_gating.delay_attr.attr.name)
                device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
        if (hba->clk_gating.enable_attr.attr.name)
                device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
{
        char wq_name[sizeof("ufs_clk_gating_00")];

        if (!ufshcd_is_clkgating_allowed(hba))
                return;

        hba->clk_gating.state = CLKS_ON;

        hba->clk_gating.delay_ms = 150;
        INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
        INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);

        snprintf(wq_name, ARRAY_SIZE(wq_name), "ufs_clk_gating_%d",
                 hba->host->host_no);
        hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name,
                                        WQ_MEM_RECLAIM | WQ_HIGHPRI);

        ufshcd_init_clk_gating_sysfs(hba);

        hba->clk_gating.is_enabled = true;
        hba->clk_gating.is_initialized = true;
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
        if (!hba->clk_gating.is_initialized)
                return;

        ufshcd_remove_clk_gating_sysfs(hba);

        /* Ungate the clock if necessary. */
        ufshcd_hold(hba, false);
        hba->clk_gating.is_initialized = false;
        ufshcd_release(hba);

        destroy_workqueue(hba->clk_gating.clk_gating_workq);
}

/* Must be called with host lock acquired */
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
        bool queue_resume_work = false;
        ktime_t curr_t = ktime_get();
        unsigned long flags;

        if (!ufshcd_is_clkscaling_supported(hba))
                return;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (!hba->clk_scaling.active_reqs++)
                queue_resume_work = true;

        if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) {
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                return;
        }

        if (queue_resume_work)
                queue_work(hba->clk_scaling.workq,
                           &hba->clk_scaling.resume_work);

        if (!hba->clk_scaling.window_start_t) {
                hba->clk_scaling.window_start_t = curr_t;
                hba->clk_scaling.tot_busy_t = 0;
                hba->clk_scaling.is_busy_started = false;
        }

        if (!hba->clk_scaling.is_busy_started) {
                hba->clk_scaling.busy_start_t = curr_t;
                hba->clk_scaling.is_busy_started = true;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
        struct ufs_clk_scaling *scaling = &hba->clk_scaling;
        unsigned long flags;

        if (!ufshcd_is_clkscaling_supported(hba))
                return;

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->clk_scaling.active_reqs--;
        if (!hba->outstanding_reqs && scaling->is_busy_started) {
                scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
                                        scaling->busy_start_t));
                scaling->busy_start_t = 0;
                scaling->is_busy_started = false;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static inline int ufshcd_monitor_opcode2dir(u8 opcode)
{
        if (opcode == READ_6 || opcode == READ_10 || opcode == READ_16)
                return READ;
        else if (opcode == WRITE_6 || opcode == WRITE_10 || opcode == WRITE_16)
                return WRITE;
        else
                return -EINVAL;
}

static inline bool ufshcd_should_inform_monitor(struct ufs_hba *hba,
                                                struct ufshcd_lrb *lrbp)
{
        const struct ufs_hba_monitor *m = &hba->monitor;

        return (m->enabled && lrbp && lrbp->cmd &&
                (!m->chunk_size || m->chunk_size == lrbp->cmd->sdb.length) &&
                ktime_before(hba->monitor.enabled_ts, lrbp->issue_time_stamp));
}

static void ufshcd_start_monitor(struct ufs_hba *hba,
                                 const struct ufshcd_lrb *lrbp)
{
        int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
        unsigned long flags;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (dir >= 0 && hba->monitor.nr_queued[dir]++ == 0)
                hba->monitor.busy_start_ts[dir] = ktime_get();
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_update_monitor(struct ufs_hba *hba, const struct ufshcd_lrb *lrbp)
{
        int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
        unsigned long flags;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (dir >= 0 && hba->monitor.nr_queued[dir] > 0) {
                const struct request *req = scsi_cmd_to_rq(lrbp->cmd);
                struct ufs_hba_monitor *m = &hba->monitor;
                ktime_t now, inc, lat;

                now = lrbp->compl_time_stamp;
                inc = ktime_sub(now, m->busy_start_ts[dir]);
                m->total_busy[dir] = ktime_add(m->total_busy[dir], inc);
                m->nr_sec_rw[dir] += blk_rq_sectors(req);

                /* Update latencies */
                m->nr_req[dir]++;
                lat = ktime_sub(now, lrbp->issue_time_stamp);
                m->lat_sum[dir] += lat;
                if (m->lat_max[dir] < lat || !m->lat_max[dir])
                        m->lat_max[dir] = lat;
                if (m->lat_min[dir] > lat || !m->lat_min[dir])
                        m->lat_min[dir] = lat;

                m->nr_queued[dir]--;
                /* Push forward the busy start of monitor */
                m->busy_start_ts[dir] = now;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);
}

/**
 * ufshcd_send_command - Send SCSI or device management commands
 * @hba: per adapter instance
 * @task_tag: Task tag of the command
 */
static inline
void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
{
        struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
        unsigned long flags;

        lrbp->issue_time_stamp = ktime_get();
        lrbp->compl_time_stamp = ktime_set(0, 0);
        ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
        ufshcd_clk_scaling_start_busy(hba);
        if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
                ufshcd_start_monitor(hba, lrbp);

        spin_lock_irqsave(&hba->outstanding_lock, flags);
        if (hba->vops && hba->vops->setup_xfer_req)
                hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
        __set_bit(task_tag, &hba->outstanding_reqs);
        ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        spin_unlock_irqrestore(&hba->outstanding_lock, flags);
}

/**
 * ufshcd_copy_sense_data - Copy sense data in case of check condition
 * @lrbp: pointer to local reference block
 */
static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
{
        u8 *const sense_buffer = lrbp->cmd->sense_buffer;
        int len;

        if (sense_buffer &&
            ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
                int len_to_copy;

                len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
                len_to_copy = min_t(int, UFS_SENSE_SIZE, len);

                memcpy(sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
                       len_to_copy);
        }
}

/**
 * ufshcd_copy_query_response() - Copy the Query Response and the data
 * descriptor
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static
int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

        memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);

        /* Get the descriptor */
        if (hba->dev_cmd.query.descriptor &&
            lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
                u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
                                GENERAL_UPIU_REQUEST_SIZE;
                u16 resp_len;
                u16 buf_len;

                /* data segment length */
                resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
                                                MASK_QUERY_DATA_SEG_LEN;
                buf_len = be16_to_cpu(
                                hba->dev_cmd.query.request.upiu_req.length);
                if (likely(buf_len >= resp_len)) {
                        memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
                } else {
                        dev_warn(hba->dev,
                                 "%s: rsp size %d is bigger than buffer size %d",
                                 __func__, resp_len, buf_len);
                        return -EINVAL;
                }
        }

        return 0;
}

/**
 * ufshcd_hba_capabilities - Read controller capabilities
 * @hba: per adapter instance
 *
 * Return: 0 on success, negative on error.
 */
static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
{
        int err;

        hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
        if (hba->quirks & UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS)
                hba->capabilities &= ~MASK_64_ADDRESSING_SUPPORT;

        /* nutrs and nutmrs are 0 based values */
        hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
        hba->nutmrs =
        ((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
        hba->reserved_slot = hba->nutrs - 1;

        /* Read crypto capabilities */
        err = ufshcd_hba_init_crypto_capabilities(hba);
        if (err)
                dev_err(hba->dev, "crypto setup failed\n");

        return err;
}

/**
 * ufshcd_ready_for_uic_cmd - Check if controller is ready
 *                            to accept UIC commands
 * @hba: per adapter instance
 * Return true on success, else false
 */
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
        return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY;
}

/**
 * ufshcd_get_upmcrs - Get the power mode change request status
 * @hba: Pointer to adapter instance
 *
 * This function gets the UPMCRS field of HCS register
 * Returns value of UPMCRS field
 */
static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
{
        return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
}

/**
 * ufshcd_dispatch_uic_cmd - Dispatch an UIC command to the Unipro layer
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 */
static inline void
ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
        lockdep_assert_held(&hba->uic_cmd_mutex);

        WARN_ON(hba->active_uic_cmd);

        hba->active_uic_cmd = uic_cmd;

        /* Write Args */
        ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
        ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
        ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);

        ufshcd_add_uic_command_trace(hba, uic_cmd, UFS_CMD_SEND);

        /* Write UIC Cmd */
        ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
                      REG_UIC_COMMAND);
}

/**
 * ufshcd_wait_for_uic_cmd - Wait for completion of an UIC command
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
static int
ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
        int ret;
        unsigned long flags;

        lockdep_assert_held(&hba->uic_cmd_mutex);

        if (wait_for_completion_timeout(&uic_cmd->done,
                                        msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
                ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
        } else {
                ret = -ETIMEDOUT;
                dev_err(hba->dev,
                        "uic cmd 0x%x with arg3 0x%x completion timeout\n",
                        uic_cmd->command, uic_cmd->argument3);

                if (!uic_cmd->cmd_active) {
                        dev_err(hba->dev, "%s: UIC cmd has been completed, return the result\n",
                                __func__);
                        ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
                }
        }

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->active_uic_cmd = NULL;
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        return ret;
}

/**
 * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 * @completion: initialize the completion only if this is set to true
 *
 * Returns 0 only if success.
 */
static int
__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
                      bool completion)
{
        lockdep_assert_held(&hba->uic_cmd_mutex);
        lockdep_assert_held(hba->host->host_lock);

        if (!ufshcd_ready_for_uic_cmd(hba)) {
                dev_err(hba->dev,
                        "Controller not ready to accept UIC commands\n");
                return -EIO;
        }

        if (completion)
                init_completion(&uic_cmd->done);

        uic_cmd->cmd_active = 1;
        ufshcd_dispatch_uic_cmd(hba, uic_cmd);

        return 0;
}

/**
 * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
        int ret;
        unsigned long flags;

        if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
                return 0;

        ufshcd_hold(hba, false);
        mutex_lock(&hba->uic_cmd_mutex);
        ufshcd_add_delay_before_dme_cmd(hba);

        spin_lock_irqsave(hba->host->host_lock, flags);
        ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        if (!ret)
                ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);

        mutex_unlock(&hba->uic_cmd_mutex);

        ufshcd_release(hba);
        return ret;
}

/**
 * ufshcd_map_sg - Map scatter-gather list to prdt
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 *
 * Returns 0 in case of success, non-zero value in case of failure
 */
static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        struct ufshcd_sg_entry *prd_table;
        struct scatterlist *sg;
        struct scsi_cmnd *cmd;
        int sg_segments;
        int i;

        cmd = lrbp->cmd;
        sg_segments = scsi_dma_map(cmd);
        if (sg_segments < 0)
                return sg_segments;

        if (sg_segments) {

                if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
                        lrbp->utr_descriptor_ptr->prd_table_length =
                                cpu_to_le16((sg_segments *
                                        sizeof(struct ufshcd_sg_entry)));
                else
                        lrbp->utr_descriptor_ptr->prd_table_length =
                                cpu_to_le16(sg_segments);

                prd_table = lrbp->ucd_prdt_ptr;

                scsi_for_each_sg(cmd, sg, sg_segments, i) {
                        const unsigned int len = sg_dma_len(sg);

                        /*
                         * From the UFSHCI spec: "Data Byte Count (DBC): A '0'
                         * based value that indicates the length, in bytes, of
                         * the data block. A maximum of length of 256KB may
                         * exist for any entry. Bits 1:0 of this field shall be
                         * 11b to indicate Dword granularity. A value of '3'
                         * indicates 4 bytes, '7' indicates 8 bytes, etc."
                         */
                        WARN_ONCE(len > 256 * 1024, "len = %#x\n", len);
                        prd_table[i].size = cpu_to_le32(len - 1);
                        prd_table[i].addr = cpu_to_le64(sg->dma_address);
                        prd_table[i].reserved = 0;
                }
        } else {
                lrbp->utr_descriptor_ptr->prd_table_length = 0;
        }

        return 0;
}

/**
 * ufshcd_enable_intr - enable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
{
        u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

        if (hba->ufs_version == ufshci_version(1, 0)) {
                u32 rw;
                rw = set & INTERRUPT_MASK_RW_VER_10;
                set = rw | ((set ^ intrs) & intrs);
        } else {
                set |= intrs;
        }

        ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_disable_intr - disable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
{
        u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

        if (hba->ufs_version == ufshci_version(1, 0)) {
                u32 rw;
                rw = (set & INTERRUPT_MASK_RW_VER_10) &
                        ~(intrs & INTERRUPT_MASK_RW_VER_10);
                set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);

        } else {
                set &= ~intrs;
        }

        ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_prepare_req_desc_hdr() - Fills the requests header
 * descriptor according to request
 * @lrbp: pointer to local reference block
 * @upiu_flags: flags required in the header
 * @cmd_dir: requests data direction
 */
static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
                        u8 *upiu_flags, enum dma_data_direction cmd_dir)
{
        struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
        u32 data_direction;
        u32 dword_0;
        u32 dword_1 = 0;
        u32 dword_3 = 0;

        if (cmd_dir == DMA_FROM_DEVICE) {
                data_direction = UTP_DEVICE_TO_HOST;
                *upiu_flags = UPIU_CMD_FLAGS_READ;
        } else if (cmd_dir == DMA_TO_DEVICE) {
                data_direction = UTP_HOST_TO_DEVICE;
                *upiu_flags = UPIU_CMD_FLAGS_WRITE;
        } else {
                data_direction = UTP_NO_DATA_TRANSFER;
                *upiu_flags = UPIU_CMD_FLAGS_NONE;
        }

        dword_0 = data_direction | (lrbp->command_type
                                << UPIU_COMMAND_TYPE_OFFSET);
        if (lrbp->intr_cmd)
                dword_0 |= UTP_REQ_DESC_INT_CMD;

        /* Prepare crypto related dwords */
        ufshcd_prepare_req_desc_hdr_crypto(lrbp, &dword_0, &dword_1, &dword_3);

        /* Transfer request descriptor header fields */
        req_desc->header.dword_0 = cpu_to_le32(dword_0);
        req_desc->header.dword_1 = cpu_to_le32(dword_1);
        /*
         * assigning invalid value for command status. Controller
         * updates OCS on command completion, with the command
         * status
         */
        req_desc->header.dword_2 =
                cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
        req_desc->header.dword_3 = cpu_to_le32(dword_3);

        req_desc->prd_table_length = 0;
}

/**
 * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
 * for scsi commands
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static
void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u8 upiu_flags)
{
        struct scsi_cmnd *cmd = lrbp->cmd;
        struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
        unsigned short cdb_len;

        /* command descriptor fields */
        ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
                                UPIU_TRANSACTION_COMMAND, upiu_flags,
                                lrbp->lun, lrbp->task_tag);
        ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
                                UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);

        /* Total EHS length and Data segment length will be zero */
        ucd_req_ptr->header.dword_2 = 0;

        ucd_req_ptr->sc.exp_data_transfer_len = cpu_to_be32(cmd->sdb.length);

        cdb_len = min_t(unsigned short, cmd->cmd_len, UFS_CDB_SIZE);
        memset(ucd_req_ptr->sc.cdb, 0, UFS_CDB_SIZE);
        memcpy(ucd_req_ptr->sc.cdb, cmd->cmnd, cdb_len);

        memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
 * for query requsts
 * @hba: UFS hba
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
                                struct ufshcd_lrb *lrbp, u8 upiu_flags)
{
        struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
        struct ufs_query *query = &hba->dev_cmd.query;
        u16 len = be16_to_cpu(query->request.upiu_req.length);

        /* Query request header */
        ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
                        UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
                        lrbp->lun, lrbp->task_tag);
        ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
                        0, query->request.query_func, 0, 0);

        /* Data segment length only need for WRITE_DESC */
        if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
                ucd_req_ptr->header.dword_2 =
                        UPIU_HEADER_DWORD(0, 0, (len >> 8), (u8)len);
        else
                ucd_req_ptr->header.dword_2 = 0;

        /* Copy the Query Request buffer as is */
        memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
                        QUERY_OSF_SIZE);

        /* Copy the Descriptor */
        if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
                memcpy(ucd_req_ptr + 1, query->descriptor, len);

        memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
{
        struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

        memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));

        /* command descriptor fields */
        ucd_req_ptr->header.dword_0 =
                UPIU_HEADER_DWORD(
                        UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
        /* clear rest of the fields of basic header */
        ucd_req_ptr->header.dword_1 = 0;
        ucd_req_ptr->header.dword_2 = 0;

        memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_compose_devman_upiu - UFS Protocol Information Unit(UPIU)
 *                           for Device Management Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_compose_devman_upiu(struct ufs_hba *hba,
                                      struct ufshcd_lrb *lrbp)
{
        u8 upiu_flags;
        int ret = 0;

        if (hba->ufs_version <= ufshci_version(1, 1))
                lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
        else
                lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

        ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
        if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
                ufshcd_prepare_utp_query_req_upiu(hba, lrbp, upiu_flags);
        else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
                ufshcd_prepare_utp_nop_upiu(lrbp);
        else
                ret = -EINVAL;

        return ret;
}

/**
 * ufshcd_comp_scsi_upiu - UFS Protocol Information Unit(UPIU)
 *                         for SCSI Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        u8 upiu_flags;
        int ret = 0;

        if (hba->ufs_version <= ufshci_version(1, 1))
                lrbp->command_type = UTP_CMD_TYPE_SCSI;
        else
                lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

        if (likely(lrbp->cmd)) {
                ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
                                                lrbp->cmd->sc_data_direction);
                ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
        } else {
                ret = -EINVAL;
        }

        return ret;
}

/**
 * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
 * @upiu_wlun_id: UPIU W-LUN id
 *
 * Returns SCSI W-LUN id
 */
static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
{
        return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}

static inline bool is_device_wlun(struct scsi_device *sdev)
{
        return sdev->lun ==
                ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN);
}

/*
 * Associate the UFS controller queue with the default and poll HCTX types.
 * Initialize the mq_map[] arrays.
 */
static int ufshcd_map_queues(struct Scsi_Host *shost)
{
        int i, ret;

        for (i = 0; i < shost->nr_maps; i++) {
                struct blk_mq_queue_map *map = &shost->tag_set.map[i];

                switch (i) {
                case HCTX_TYPE_DEFAULT:
                case HCTX_TYPE_POLL:
                        map->nr_queues = 1;
                        break;
                case HCTX_TYPE_READ:
                        map->nr_queues = 0;
                        continue;
                default:
                        WARN_ON_ONCE(true);
                }
                map->queue_offset = 0;
                ret = blk_mq_map_queues(map);
                WARN_ON_ONCE(ret);
        }

        return 0;
}

static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i)
{
        struct utp_transfer_cmd_desc *cmd_descp = hba->ucdl_base_addr;
        struct utp_transfer_req_desc *utrdlp = hba->utrdl_base_addr;
        dma_addr_t cmd_desc_element_addr = hba->ucdl_dma_addr +
                i * sizeof(struct utp_transfer_cmd_desc);
        u16 response_offset = offsetof(struct utp_transfer_cmd_desc,
                                       response_upiu);
        u16 prdt_offset = offsetof(struct utp_transfer_cmd_desc, prd_table);

        lrb->utr_descriptor_ptr = utrdlp + i;
        lrb->utrd_dma_addr = hba->utrdl_dma_addr +
                i * sizeof(struct utp_transfer_req_desc);
        lrb->ucd_req_ptr = (struct utp_upiu_req *)(cmd_descp + i);
        lrb->ucd_req_dma_addr = cmd_desc_element_addr;
        lrb->ucd_rsp_ptr = (struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
        lrb->ucd_rsp_dma_addr = cmd_desc_element_addr + response_offset;
        lrb->ucd_prdt_ptr = cmd_descp[i].prd_table;
        lrb->ucd_prdt_dma_addr = cmd_desc_element_addr + prdt_offset;
}

/**
 * ufshcd_queuecommand - main entry point for SCSI requests
 * @host: SCSI host pointer
 * @cmd: command from SCSI Midlayer
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
        struct ufs_hba *hba = shost_priv(host);
        int tag = scsi_cmd_to_rq(cmd)->tag;
        struct ufshcd_lrb *lrbp;
        int err = 0;

        WARN_ONCE(tag < 0 || tag >= hba->nutrs, "Invalid tag %d\n", tag);

        /*
         * Allows the UFS error handler to wait for prior ufshcd_queuecommand()
         * calls.
         */
        rcu_read_lock();

        switch (hba->ufshcd_state) {
        case UFSHCD_STATE_OPERATIONAL:
                break;
        case UFSHCD_STATE_EH_SCHEDULED_NON_FATAL:
                /*
                 * SCSI error handler can call ->queuecommand() while UFS error
                 * handler is in progress. Error interrupts could change the
                 * state from UFSHCD_STATE_RESET to
                 * UFSHCD_STATE_EH_SCHEDULED_NON_FATAL. Prevent requests
                 * being issued in that case.
                 */
                if (ufshcd_eh_in_progress(hba)) {
                        err = SCSI_MLQUEUE_HOST_BUSY;
                        goto out;
                }
                break;
        case UFSHCD_STATE_EH_SCHEDULED_FATAL:
                /*
                 * pm_runtime_get_sync() is used at error handling preparation
                 * stage. If a scsi cmd, e.g. the SSU cmd, is sent from hba's
                 * PM ops, it can never be finished if we let SCSI layer keep
                 * retrying it, which gets err handler stuck forever. Neither
                 * can we let the scsi cmd pass through, because UFS is in bad
                 * state, the scsi cmd may eventually time out, which will get
                 * err handler blocked for too long. So, just fail the scsi cmd
                 * sent from PM ops, err handler can recover PM error anyways.
                 */
                if (hba->pm_op_in_progress) {
                        hba->force_reset = true;
                        set_host_byte(cmd, DID_BAD_TARGET);
                        scsi_done(cmd);
                        goto out;
                }
                fallthrough;
        case UFSHCD_STATE_RESET:
                err = SCSI_MLQUEUE_HOST_BUSY;
                goto out;
        case UFSHCD_STATE_ERROR:
                set_host_byte(cmd, DID_ERROR);
                scsi_done(cmd);
                goto out;
        }

        hba->req_abort_count = 0;

        err = ufshcd_hold(hba, true);
        if (err) {
                err = SCSI_MLQUEUE_HOST_BUSY;
                goto out;
        }
        WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
                (hba->clk_gating.state != CLKS_ON));

        lrbp = &hba->lrb[tag];
        WARN_ON(lrbp->cmd);
        lrbp->cmd = cmd;
        lrbp->task_tag = tag;
        lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
        lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba);

        ufshcd_prepare_lrbp_crypto(scsi_cmd_to_rq(cmd), lrbp);

        lrbp->req_abort_skip = false;

        ufshpb_prep(hba, lrbp);

        ufshcd_comp_scsi_upiu(hba, lrbp);

        err = ufshcd_map_sg(hba, lrbp);
        if (err) {
                lrbp->cmd = NULL;
                ufshcd_release(hba);
                goto out;
        }

        ufshcd_send_command(hba, tag);

out:
        rcu_read_unlock();

        if (ufs_trigger_eh()) {
                unsigned long flags;

                spin_lock_irqsave(hba->host->host_lock, flags);
                ufshcd_schedule_eh_work(hba);
                spin_unlock_irqrestore(hba->host->host_lock, flags);
        }

        return err;
}

static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
                struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
{
        lrbp->cmd = NULL;
        lrbp->task_tag = tag;
        lrbp->lun = 0; /* device management cmd is not specific to any LUN */
        lrbp->intr_cmd = true; /* No interrupt aggregation */
        ufshcd_prepare_lrbp_crypto(NULL, lrbp);
        hba->dev_cmd.type = cmd_type;

        return ufshcd_compose_devman_upiu(hba, lrbp);
}

/*
 * Clear all the requests from the controller for which a bit has been set in
 * @mask and wait until the controller confirms that these requests have been
 * cleared.
 */
static int ufshcd_clear_cmds(struct ufs_hba *hba, u32 mask)
{
        unsigned long flags;

        /* clear outstanding transaction before retry */
        spin_lock_irqsave(hba->host->host_lock, flags);
        ufshcd_utrl_clear(hba, mask);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        /*
         * wait for h/w to clear corresponding bit in door-bell.
         * max. wait is 1 sec.
         */
        return ufshcd_wait_for_register(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL,
                                        mask, ~mask, 1000, 1000);
}

static int
ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

        /* Get the UPIU response */
        query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
                                UPIU_RSP_CODE_OFFSET;
        return query_res->response;
}

/**
 * ufshcd_dev_cmd_completion() - handles device management command responses
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int
ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        int resp;
        int err = 0;

        hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
        resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);

        switch (resp) {
        case UPIU_TRANSACTION_NOP_IN:
                if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
                        err = -EINVAL;
                        dev_err(hba->dev, "%s: unexpected response %x\n",
                                        __func__, resp);
                }
                break;
        case UPIU_TRANSACTION_QUERY_RSP:
                err = ufshcd_check_query_response(hba, lrbp);
                if (!err)
                        err = ufshcd_copy_query_response(hba, lrbp);
                break;
        case UPIU_TRANSACTION_REJECT_UPIU:
                /* TODO: handle Reject UPIU Response */
                err = -EPERM;
                dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
                                __func__);
                break;
        default:
                err = -EINVAL;
                dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
                                __func__, resp);
                break;
        }

        return err;
}

static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
                struct ufshcd_lrb *lrbp, int max_timeout)
{
        int err = 0;
        unsigned long time_left;
        unsigned long flags;

        time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
                        msecs_to_jiffies(max_timeout));

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->dev_cmd.complete = NULL;
        if (likely(time_left)) {
                err = ufshcd_get_tr_ocs(lrbp);
                if (!err)
                        err = ufshcd_dev_cmd_completion(hba, lrbp);
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (!time_left) {
                err = -ETIMEDOUT;
                dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
                        __func__, lrbp->task_tag);
                if (!ufshcd_clear_cmds(hba, 1U << lrbp->task_tag))
                        /* successfully cleared the command, retry if needed */
                        err = -EAGAIN;
                /*
                 * in case of an error, after clearing the doorbell,
                 * we also need to clear the outstanding_request
                 * field in hba
                 */
                spin_lock_irqsave(&hba->outstanding_lock, flags);
                __clear_bit(lrbp->task_tag, &hba->outstanding_reqs);
                spin_unlock_irqrestore(&hba->outstanding_lock, flags);
        }

        return err;
}

/**
 * ufshcd_exec_dev_cmd - API for sending device management requests
 * @hba: UFS hba
 * @cmd_type: specifies the type (NOP, Query...)
 * @timeout: timeout in milliseconds
 *
 * NOTE: Since there is only one available tag for device management commands,
 * it is expected you hold the hba->dev_cmd.lock mutex.
 */
static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
                enum dev_cmd_type cmd_type, int timeout)
{
        DECLARE_COMPLETION_ONSTACK(wait);
        const u32 tag = hba->reserved_slot;
        struct ufshcd_lrb *lrbp;
        int err;

        /* Protects use of hba->reserved_slot. */
        lockdep_assert_held(&hba->dev_cmd.lock);

        down_read(&hba->clk_scaling_lock);

        lrbp = &hba->lrb[tag];
        WARN_ON(lrbp->cmd);
        err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
        if (unlikely(err))
                goto out;

        hba->dev_cmd.complete = &wait;

        ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);

        ufshcd_send_command(hba, tag);
        err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
        ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
                                    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);

out:
        up_read(&hba->clk_scaling_lock);
        return err;
}

/**
 * ufshcd_init_query() - init the query response and request parameters
 * @hba: per-adapter instance
 * @request: address of the request pointer to be initialized
 * @response: address of the response pointer to be initialized
 * @opcode: operation to perform
 * @idn: flag idn to access
 * @index: LU number to access
 * @selector: query/flag/descriptor further identification
 */
static inline void ufshcd_init_query(struct ufs_hba *hba,
                struct ufs_query_req **request, struct ufs_query_res **response,
                enum query_opcode opcode, u8 idn, u8 index, u8 selector)
{
        *request = &hba->dev_cmd.query.request;
        *response = &hba->dev_cmd.query.response;
        memset(*request, 0, sizeof(struct ufs_query_req));
        memset(*response, 0, sizeof(struct ufs_query_res));
        (*request)->upiu_req.opcode = opcode;
        (*request)->upiu_req.idn = idn;
        (*request)->upiu_req.index = index;
        (*request)->upiu_req.selector = selector;
}

static int ufshcd_query_flag_retry(struct ufs_hba *hba,
        enum query_opcode opcode, enum flag_idn idn, u8 index, bool *flag_res)
{
        int ret;
        int retries;

        for (retries = 0; retries < QUERY_REQ_RETRIES; retries++) {
                ret = ufshcd_query_flag(hba, opcode, idn, index, flag_res);
                if (ret)
                        dev_dbg(hba->dev,
                                "%s: failed with error %d, retries %d\n",
                                __func__, ret, retries);
                else
                        break;
        }

        if (ret)
                dev_err(hba->dev,
                        "%s: query attribute, opcode %d, idn %d, failed with error %d after %d retries\n",
                        __func__, opcode, idn, ret, retries);
        return ret;
}

/**
 * ufshcd_query_flag() - API function for sending flag query requests
 * @hba: per-adapter instance
 * @opcode: flag query to perform
 * @idn: flag idn to access
 * @index: flag index to access
 * @flag_res: the flag value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
 */
int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
                        enum flag_idn idn, u8 index, bool *flag_res)
{
        struct ufs_query_req *request = NULL;
        struct ufs_query_res *response = NULL;
        int err, selector = 0;
        int timeout = QUERY_REQ_TIMEOUT;

        BUG_ON(!hba);

        ufshcd_hold(hba, false);
        mutex_lock(&hba->dev_cmd.lock);
        ufshcd_init_query(hba, &request, &response, opcode, idn, index,
                        selector);

        switch (opcode) {
        case UPIU_QUERY_OPCODE_SET_FLAG:
        case UPIU_QUERY_OPCODE_CLEAR_FLAG:
        case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
                break;
        case UPIU_QUERY_OPCODE_READ_FLAG:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
                if (!flag_res) {
                        /* No dummy reads */
                        dev_err(hba->dev, "%s: Invalid argument for read request\n",
                                        __func__);
                        err = -EINVAL;
                        goto out_unlock;
                }
                break;
        default:
                dev_err(hba->dev,
                        "%s: Expected query flag opcode but got = %d\n",
                        __func__, opcode);
                err = -EINVAL;
                goto out_unlock;
        }

        err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, timeout);

        if (err) {
                dev_err(hba->dev,
                        "%s: Sending flag query for idn %d failed, err = %d\n",
                        __func__, idn, err);
                goto out_unlock;
        }

        if (flag_res)
                *flag_res = (be32_to_cpu(response->upiu_res.value) &
                                MASK_QUERY_UPIU_FLAG_LOC) & 0x1;

out_unlock:
        mutex_unlock(&hba->dev_cmd.lock);
        ufshcd_release(hba);
        return err;
}

/**
 * ufshcd_query_attr - API function for sending attribute requests
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @attr_val: the attribute value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
                      enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
{
        struct ufs_query_req *request = NULL;
        struct ufs_query_res *response = NULL;
        int err;

        BUG_ON(!hba);

        if (!attr_val) {
                dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
                                __func__, opcode);
                return -EINVAL;
        }

        ufshcd_hold(hba, false);

        mutex_lock(&hba->dev_cmd.lock);
        ufshcd_init_query(hba, &request, &response, opcode, idn, index,
                        selector);

        switch (opcode) {
        case UPIU_QUERY_OPCODE_WRITE_ATTR:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
                request->upiu_req.value = cpu_to_be32(*attr_val);
                break;
        case UPIU_QUERY_OPCODE_READ_ATTR:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
                break;
        default:
                dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
                                __func__, opcode);
                err = -EINVAL;
                goto out_unlock;
        }

        err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);

        if (err) {
                dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
                                __func__, opcode, idn, index, err);
                goto out_unlock;
        }

        *attr_val = be32_to_cpu(response->upiu_res.value);

out_unlock:
        mutex_unlock(&hba->dev_cmd.lock);
        ufshcd_release(hba);
        return err;
}

/**
 * ufshcd_query_attr_retry() - API function for sending query
 * attribute with retries
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @attr_val: the attribute value after the query request
 * completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
int ufshcd_query_attr_retry(struct ufs_hba *hba,
        enum query_opcode opcode, enum attr_idn idn, u8 index, u8 selector,
        u32 *attr_val)
{
        int ret = 0;
        u32 retries;

        for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
                ret = ufshcd_query_attr(hba, opcode, idn, index,
                                                selector, attr_val);
                if (ret)
                        dev_dbg(hba->dev, "%s: failed with error %d, retries %d\n",
                                __func__, ret, retries);
                else
                        break;
        }

        if (ret)
                dev_err(hba->dev,
                        "%s: query attribute, idn %d, failed with error %d after %d retries\n",
                        __func__, idn, ret, QUERY_REQ_RETRIES);
        return ret;
}

static int __ufshcd_query_descriptor(struct ufs_hba *hba,
                        enum query_opcode opcode, enum desc_idn idn, u8 index,
                        u8 selector, u8 *desc_buf, int *buf_len)
{
        struct ufs_query_req *request = NULL;
        struct ufs_query_res *response = NULL;
        int err;

        BUG_ON(!hba);

        if (!desc_buf) {
                dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
                                __func__, opcode);
                return -EINVAL;
        }

        if (*buf_len < QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
                dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
                                __func__, *buf_len);
                return -EINVAL;
        }

        ufshcd_hold(hba, false);

        mutex_lock(&hba->dev_cmd.lock);
        ufshcd_init_query(hba, &request, &response, opcode, idn, index,
                        selector);
        hba->dev_cmd.query.descriptor = desc_buf;
        request->upiu_req.length = cpu_to_be16(*buf_len);

        switch (opcode) {
        case UPIU_QUERY_OPCODE_WRITE_DESC:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
                break;
        case UPIU_QUERY_OPCODE_READ_DESC:
                request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
                break;
        default:
                dev_err(hba->dev,
                                "%s: Expected query descriptor opcode but got = 0x%.2x\n",
                                __func__, opcode);
                err = -EINVAL;
                goto out_unlock;
        }

        err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);

        if (err) {
                dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
                                __func__, opcode, idn, index, err);
                goto out_unlock;
        }

        *buf_len = be16_to_cpu(response->upiu_res.length);

out_unlock:
        hba->dev_cmd.query.descriptor = NULL;
        mutex_unlock(&hba->dev_cmd.lock);
        ufshcd_release(hba);
        return err;
}

/**
 * ufshcd_query_descriptor_retry - API function for sending descriptor requests
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @desc_buf: the buffer that contains the descriptor
 * @buf_len: length parameter passed to the device
 *
 * Returns 0 for success, non-zero in case of failure.
 * The buf_len parameter will contain, on return, the length parameter
 * received on the response.
 */
int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
                                  enum query_opcode opcode,
                                  enum desc_idn idn, u8 index,
                                  u8 selector,
                                  u8 *desc_buf, int *buf_len)
{
        int err;
        int retries;

        for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
                err = __ufshcd_query_descriptor(hba, opcode, idn, index,
                                                selector, desc_buf, buf_len);
                if (!err || err == -EINVAL)
                        break;
        }

        return err;
}

/**
 * ufshcd_map_desc_id_to_length - map descriptor IDN to its length
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_len: mapped desc length (out)
 */
void ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id,
                                  int *desc_len)
{
        if (desc_id >= QUERY_DESC_IDN_MAX || desc_id == QUERY_DESC_IDN_RFU_0 ||
            desc_id == QUERY_DESC_IDN_RFU_1)
                *desc_len = 0;
        else
                *desc_len = hba->desc_size[desc_id];
}
EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);

static void ufshcd_update_desc_length(struct ufs_hba *hba,
                                      enum desc_idn desc_id, int desc_index,
                                      unsigned char desc_len)
{
        if (hba->desc_size[desc_id] == QUERY_DESC_MAX_SIZE &&
            desc_id != QUERY_DESC_IDN_STRING && desc_index != UFS_RPMB_UNIT)
                /* For UFS 3.1, the normal unit descriptor is 10 bytes larger
                 * than the RPMB unit, however, both descriptors share the same
                 * desc_idn, to cover both unit descriptors with one length, we
                 * choose the normal unit descriptor length by desc_index.
                 */
                hba->desc_size[desc_id] = desc_len;
}

/**
 * ufshcd_read_desc_param - read the specified descriptor parameter
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_index: descriptor index
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
int ufshcd_read_desc_param(struct ufs_hba *hba,
                           enum desc_idn desc_id,
                           int desc_index,
                           u8 param_offset,
                           u8 *param_read_buf,
                           u8 param_size)
{
        int ret;
        u8 *desc_buf;
        int buff_len;
        bool is_kmalloc = true;

        /* Safety check */
        if (desc_id >= QUERY_DESC_IDN_MAX || !param_size)
                return -EINVAL;

        /* Get the length of descriptor */
        ufshcd_map_desc_id_to_length(hba, desc_id, &buff_len);
        if (!buff_len) {
                dev_err(hba->dev, "%s: Failed to get desc length\n", __func__);
                return -EINVAL;
        }

        if (param_offset >= buff_len) {
                dev_err(hba->dev, "%s: Invalid offset 0x%x in descriptor IDN 0x%x, length 0x%x\n",
                        __func__, param_offset, desc_id, buff_len);
                return -EINVAL;
        }

        /* Check whether we need temp memory */
        if (param_offset != 0 || param_size < buff_len) {
                desc_buf = kzalloc(buff_len, GFP_KERNEL);
                if (!desc_buf)
                        return -ENOMEM;
        } else {
                desc_buf = param_read_buf;
                is_kmalloc = false;
        }

        /* Request for full descriptor */
        ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
                                        desc_id, desc_index, 0,
                                        desc_buf, &buff_len);

        if (ret) {
                dev_err(hba->dev, "%s: Failed reading descriptor. desc_id %d, desc_index %d, param_offset %d, ret %d\n",
                        __func__, desc_id, desc_index, param_offset, ret);
                goto out;
        }

        /* Sanity check */
        if (desc_buf[QUERY_DESC_DESC_TYPE_OFFSET] != desc_id) {
                dev_err(hba->dev, "%s: invalid desc_id %d in descriptor header\n",
                        __func__, desc_buf[QUERY_DESC_DESC_TYPE_OFFSET]);
                ret = -EINVAL;
                goto out;
        }

        /* Update descriptor length */
        buff_len = desc_buf[QUERY_DESC_LENGTH_OFFSET];
        ufshcd_update_desc_length(hba, desc_id, desc_index, buff_len);

        if (is_kmalloc) {
                /* Make sure we don't copy more data than available */
                if (param_offset >= buff_len)
                        ret = -EINVAL;
                else
                        memcpy(param_read_buf, &desc_buf[param_offset],
                               min_t(u32, param_size, buff_len - param_offset));
        }
out:
        if (is_kmalloc)
                kfree(desc_buf);
        return ret;
}

/**
 * struct uc_string_id - unicode string
 *
 * @len: size of this descriptor inclusive
 * @type: descriptor type
 * @uc: unicode string character
 */
struct uc_string_id {
        u8 len;
        u8 type;
        wchar_t uc[];
} __packed;

/* replace non-printable or non-ASCII characters with spaces */
static inline char ufshcd_remove_non_printable(u8 ch)
{
        return (ch >= 0x20 && ch <= 0x7e) ? ch : ' ';
}

/**
 * ufshcd_read_string_desc - read string descriptor
 * @hba: pointer to adapter instance
 * @desc_index: descriptor index
 * @buf: pointer to buffer where descriptor would be read,
 *       the caller should free the memory.
 * @ascii: if true convert from unicode to ascii characters
 *         null terminated string.
 *
 * Return:
 * *      string size on success.
 * *      -ENOMEM: on allocation failure
 * *      -EINVAL: on a wrong parameter
 */
int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
                            u8 **buf, bool ascii)
{
        struct uc_string_id *uc_str;
        u8 *str;
        int ret;

        if (!buf)
                return -EINVAL;

        uc_str = kzalloc(QUERY_DESC_MAX_SIZE, GFP_KERNEL);
        if (!uc_str)
                return -ENOMEM;

        ret = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_STRING, desc_index, 0,
                                     (u8 *)uc_str, QUERY_DESC_MAX_SIZE);
        if (ret < 0) {
                dev_err(hba->dev, "Reading String Desc failed after %d retries. err = %d\n",
                        QUERY_REQ_RETRIES, ret);
                str = NULL;
                goto out;
        }

        if (uc_str->len <= QUERY_DESC_HDR_SIZE) {
                dev_dbg(hba->dev, "String Desc is of zero length\n");
                str = NULL;
                ret = 0;
                goto out;
        }

        if (ascii) {
                ssize_t ascii_len;
                int i;
                /* remove header and divide by 2 to move from UTF16 to UTF8 */
                ascii_len = (uc_str->len - QUERY_DESC_HDR_SIZE) / 2 + 1;
                str = kzalloc(ascii_len, GFP_KERNEL);
                if (!str) {
                        ret = -ENOMEM;
                        goto out;
                }

                /*
                 * the descriptor contains string in UTF16 format
                 * we need to convert to utf-8 so it can be displayed
                 */
                ret = utf16s_to_utf8s(uc_str->uc,
                                      uc_str->len - QUERY_DESC_HDR_SIZE,
                                      UTF16_BIG_ENDIAN, str, ascii_len);

                /* replace non-printable or non-ASCII characters with spaces */
                for (i = 0; i < ret; i++)
                        str[i] = ufshcd_remove_non_printable(str[i]);

                str[ret++] = '\0';

        } else {
                str = kmemdup(uc_str, uc_str->len, GFP_KERNEL);
                if (!str) {
                        ret = -ENOMEM;
                        goto out;
                }
                ret = uc_str->len;
        }
out:
        *buf = str;
        kfree(uc_str);
        return ret;
}

/**
 * ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
 * @hba: Pointer to adapter instance
 * @lun: lun id
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
                                              int lun,
                                              enum unit_desc_param param_offset,
                                              u8 *param_read_buf,
                                              u32 param_size)
{
        /*
         * Unit descriptors are only available for general purpose LUs (LUN id
         * from 0 to 7) and RPMB Well known LU.
         */
        if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun, param_offset))
                return -EOPNOTSUPP;

        return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
                                      param_offset, param_read_buf, param_size);
}

static int ufshcd_get_ref_clk_gating_wait(struct ufs_hba *hba)
{
        int err = 0;
        u32 gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US;

        if (hba->dev_info.wspecversion >= 0x300) {
                err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                                QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME, 0, 0,
                                &gating_wait);
                if (err)
                        dev_err(hba->dev, "Failed reading bRefClkGatingWait. err = %d, use default %uus\n",
                                         err, gating_wait);

                if (gating_wait == 0) {
                        gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US;
                        dev_err(hba->dev, "Undefined ref clk gating wait time, use default %uus\n",
                                         gating_wait);
                }

                hba->dev_info.clk_gating_wait_us = gating_wait;
        }

        return err;
}

/**
 * ufshcd_memory_alloc - allocate memory for host memory space data structures
 * @hba: per adapter instance
 *
 * 1. Allocate DMA memory for Command Descriptor array
 *      Each command descriptor consist of Command UPIU, Response UPIU and PRDT
 * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
 * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
 *      (UTMRDL)
 * 4. Allocate memory for local reference block(lrb).
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_memory_alloc(struct ufs_hba *hba)
{
        size_t utmrdl_size, utrdl_size, ucdl_size;

        /* Allocate memory for UTP command descriptors */
        ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
        hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
                                                  ucdl_size,
                                                  &hba->ucdl_dma_addr,
                                                  GFP_KERNEL);

        /*
         * UFSHCI requires UTP command descriptor to be 128 byte aligned.
         * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE
         * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will
         * be aligned to 128 bytes as well
         */
        if (!hba->ucdl_base_addr ||
            WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) {
                dev_err(hba->dev,
                        "Command Descriptor Memory allocation failed\n");
                goto out;
        }

        /*
         * Allocate memory for UTP Transfer descriptors
         * UFSHCI requires 1024 byte alignment of UTRD
         */
        utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
        hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
                                                   utrdl_size,
                                                   &hba->utrdl_dma_addr,
                                                   GFP_KERNEL);
        if (!hba->utrdl_base_addr ||
            WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
                dev_err(hba->dev,
                        "Transfer Descriptor Memory allocation failed\n");
                goto out;
        }

        /*
         * Allocate memory for UTP Task Management descriptors
         * UFSHCI requires 1024 byte alignment of UTMRD
         */
        utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
        hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
                                                    utmrdl_size,
                                                    &hba->utmrdl_dma_addr,
                                                    GFP_KERNEL);
        if (!hba->utmrdl_base_addr ||
            WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
                dev_err(hba->dev,
                "Task Management Descriptor Memory allocation failed\n");
                goto out;
        }

        /* Allocate memory for local reference block */
        hba->lrb = devm_kcalloc(hba->dev,
                                hba->nutrs, sizeof(struct ufshcd_lrb),
                                GFP_KERNEL);
        if (!hba->lrb) {
                dev_err(hba->dev, "LRB Memory allocation failed\n");
                goto out;
        }
        return 0;
out:
        return -ENOMEM;
}

/**
 * ufshcd_host_memory_configure - configure local reference block with
 *                              memory offsets
 * @hba: per adapter instance
 *
 * Configure Host memory space
 * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA
 * address.
 * 2. Update each UTRD with Response UPIU offset, Response UPIU length
 * and PRDT offset.
 * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
 * into local reference block.
 */
static void ufshcd_host_memory_configure(struct ufs_hba *hba)
{
        struct utp_transfer_req_desc *utrdlp;
        dma_addr_t cmd_desc_dma_addr;
        dma_addr_t cmd_desc_element_addr;
        u16 response_offset;
        u16 prdt_offset;
        int cmd_desc_size;
        int i;

        utrdlp = hba->utrdl_base_addr;

        response_offset =
                offsetof(struct utp_transfer_cmd_desc, response_upiu);
        prdt_offset =
                offsetof(struct utp_transfer_cmd_desc, prd_table);

        cmd_desc_size = sizeof(struct utp_transfer_cmd_desc);
        cmd_desc_dma_addr = hba->ucdl_dma_addr;

        for (i = 0; i < hba->nutrs; i++) {
                /* Configure UTRD with command descriptor base address */
                cmd_desc_element_addr =
                                (cmd_desc_dma_addr + (cmd_desc_size * i));
                utrdlp[i].command_desc_base_addr_lo =
                                cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
                utrdlp[i].command_desc_base_addr_hi =
                                cpu_to_le32(upper_32_bits(cmd_desc_element_addr));

                /* Response upiu and prdt offset should be in double words */
                if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
                        utrdlp[i].response_upiu_offset =
                                cpu_to_le16(response_offset);
                        utrdlp[i].prd_table_offset =
                                cpu_to_le16(prdt_offset);
                        utrdlp[i].response_upiu_length =
                                cpu_to_le16(ALIGNED_UPIU_SIZE);
                } else {
                        utrdlp[i].response_upiu_offset =
                                cpu_to_le16(response_offset >> 2);
                        utrdlp[i].prd_table_offset =
                                cpu_to_le16(prdt_offset >> 2);
                        utrdlp[i].response_upiu_length =
                                cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
                }

                ufshcd_init_lrb(hba, &hba->lrb[i], i);
        }
}

/**
 * ufshcd_dme_link_startup - Notify Unipro to perform link startup
 * @hba: per adapter instance
 *
 * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer,
 * in order to initialize the Unipro link startup procedure.
 * Once the Unipro links are up, the device connected to the controller
 * is detected.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_link_startup(struct ufs_hba *hba)
{
        struct uic_command uic_cmd = {0};
        int ret;

        uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;

        ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
        if (ret)
                dev_dbg(hba->dev,
                        "dme-link-startup: error code %d\n", ret);
        return ret;
}
/**
 * ufshcd_dme_reset - UIC command for DME_RESET
 * @hba: per adapter instance
 *
 * DME_RESET command is issued in order to reset UniPro stack.
 * This function now deals with cold reset.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_reset(struct ufs_hba *hba)
{
        struct uic_command uic_cmd = {0};
        int ret;

        uic_cmd.command = UIC_CMD_DME_RESET;

        ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
        if (ret)
                dev_err(hba->dev,
                        "dme-reset: error code %d\n", ret);

        return ret;
}

int ufshcd_dme_configure_adapt(struct ufs_hba *hba,
                               int agreed_gear,
                               int adapt_val)
{
        int ret;

        if (agreed_gear < UFS_HS_G4)
                adapt_val = PA_NO_ADAPT;

        ret = ufshcd_dme_set(hba,
                             UIC_ARG_MIB(PA_TXHSADAPTTYPE),
                             adapt_val);
        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_configure_adapt);

/**
 * ufshcd_dme_enable - UIC command for DME_ENABLE
 * @hba: per adapter instance
 *
 * DME_ENABLE command is issued in order to enable UniPro stack.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_enable(struct ufs_hba *hba)
{
        struct uic_command uic_cmd = {0};
        int ret;

        uic_cmd.command = UIC_CMD_DME_ENABLE;

        ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
        if (ret)
                dev_err(hba->dev,
                        "dme-enable: error code %d\n", ret);

        return ret;
}

static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
{
        #define MIN_DELAY_BEFORE_DME_CMDS_US    1000
        unsigned long min_sleep_time_us;

        if (!(hba->quirks & UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS))
                return;

        /*
         * last_dme_cmd_tstamp will be 0 only for 1st call to
         * this function
         */
        if (unlikely(!ktime_to_us(hba->last_dme_cmd_tstamp))) {
                min_sleep_time_us = MIN_DELAY_BEFORE_DME_CMDS_US;
        } else {
                unsigned long delta =
                        (unsigned long) ktime_to_us(
                                ktime_sub(ktime_get(),
                                hba->last_dme_cmd_tstamp));

                if (delta < MIN_DELAY_BEFORE_DME_CMDS_US)
                        min_sleep_time_us =
                                MIN_DELAY_BEFORE_DME_CMDS_US - delta;
                else
                        return; /* no more delay required */
        }

        /* allow sleep for extra 50us if needed */
        usleep_range(min_sleep_time_us, min_sleep_time_us + 50);
}

/**
 * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @attr_set: attribute set type as uic command argument2
 * @mib_val: setting value as uic command argument3
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
                        u8 attr_set, u32 mib_val, u8 peer)
{
        struct uic_command uic_cmd = {0};
        static const char *const action[] = {
                "dme-set",
                "dme-peer-set"
        };
        const char *set = action[!!peer];
        int ret;
        int retries = UFS_UIC_COMMAND_RETRIES;

        uic_cmd.command = peer ?
                UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
        uic_cmd.argument1 = attr_sel;
        uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
        uic_cmd.argument3 = mib_val;

        do {
                /* for peer attributes we retry upon failure */
                ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
                if (ret)
                        dev_dbg(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
                                set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
        } while (ret && peer && --retries);

        if (ret)
                dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x failed %d retries\n",
                        set, UIC_GET_ATTR_ID(attr_sel), mib_val,
                        UFS_UIC_COMMAND_RETRIES - retries);

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);

/**
 * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @mib_val: the value of the attribute as returned by the UIC command
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
                        u32 *mib_val, u8 peer)
{
        struct uic_command uic_cmd = {0};
        static const char *const action[] = {
                "dme-get",
                "dme-peer-get"
        };
        const char *get = action[!!peer];
        int ret;
        int retries = UFS_UIC_COMMAND_RETRIES;
        struct ufs_pa_layer_attr orig_pwr_info;
        struct ufs_pa_layer_attr temp_pwr_info;
        bool pwr_mode_change = false;

        if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)) {
                orig_pwr_info = hba->pwr_info;
                temp_pwr_info = orig_pwr_info;

                if (orig_pwr_info.pwr_tx == FAST_MODE ||
                    orig_pwr_info.pwr_rx == FAST_MODE) {
                        temp_pwr_info.pwr_tx = FASTAUTO_MODE;
                        temp_pwr_info.pwr_rx = FASTAUTO_MODE;
                        pwr_mode_change = true;
                } else if (orig_pwr_info.pwr_tx == SLOW_MODE ||
                    orig_pwr_info.pwr_rx == SLOW_MODE) {
                        temp_pwr_info.pwr_tx = SLOWAUTO_MODE;
                        temp_pwr_info.pwr_rx = SLOWAUTO_MODE;
                        pwr_mode_change = true;
                }
                if (pwr_mode_change) {
                        ret = ufshcd_change_power_mode(hba, &temp_pwr_info);
                        if (ret)
                                goto out;
                }
        }

        uic_cmd.command = peer ?
                UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
        uic_cmd.argument1 = attr_sel;

        do {
                /* for peer attributes we retry upon failure */
                ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
                if (ret)
                        dev_dbg(hba->dev, "%s: attr-id 0x%x error code %d\n",
                                get, UIC_GET_ATTR_ID(attr_sel), ret);
        } while (ret && peer && --retries);

        if (ret)
                dev_err(hba->dev, "%s: attr-id 0x%x failed %d retries\n",
                        get, UIC_GET_ATTR_ID(attr_sel),
                        UFS_UIC_COMMAND_RETRIES - retries);

        if (mib_val && !ret)
                *mib_val = uic_cmd.argument3;

        if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)
            && pwr_mode_change)
                ufshcd_change_power_mode(hba, &orig_pwr_info);
out:
        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);

/**
 * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
 * state) and waits for it to take effect.
 *
 * @hba: per adapter instance
 * @cmd: UIC command to execute
 *
 * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER &
 * DME_HIBERNATE_EXIT commands take some time to take its effect on both host
 * and device UniPro link and hence it's final completion would be indicated by
 * dedicated status bits in Interrupt Status register (UPMS, UHES, UHXS) in
 * addition to normal UIC command completion Status (UCCS). This function only
 * returns after the relevant status bits indicate the completion.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
{
        DECLARE_COMPLETION_ONSTACK(uic_async_done);
        unsigned long flags;
        u8 status;
        int ret;
        bool reenable_intr = false;

        mutex_lock(&hba->uic_cmd_mutex);
        ufshcd_add_delay_before_dme_cmd(hba);

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (ufshcd_is_link_broken(hba)) {
                ret = -ENOLINK;
                goto out_unlock;
        }
        hba->uic_async_done = &uic_async_done;
        if (ufshcd_readl(hba, REG_INTERRUPT_ENABLE) & UIC_COMMAND_COMPL) {
                ufshcd_disable_intr(hba, UIC_COMMAND_COMPL);
                /*
                 * Make sure UIC command completion interrupt is disabled before
                 * issuing UIC command.
                 */
                wmb();
                reenable_intr = true;
        }
        ret = __ufshcd_send_uic_cmd(hba, cmd, false);
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        if (ret) {
                dev_err(hba->dev,
                        "pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
                        cmd->command, cmd->argument3, ret);
                goto out;
        }

        if (!wait_for_completion_timeout(hba->uic_async_done,
                                         msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
                dev_err(hba->dev,
                        "pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n",
                        cmd->command, cmd->argument3);

                if (!cmd->cmd_active) {
                        dev_err(hba->dev, "%s: Power Mode Change operation has been completed, go check UPMCRS\n",
                                __func__);
                        goto check_upmcrs;
                }

                ret = -ETIMEDOUT;
                goto out;
        }

check_upmcrs:
        status = ufshcd_get_upmcrs(hba);
        if (status != PWR_LOCAL) {
                dev_err(hba->dev,
                        "pwr ctrl cmd 0x%x failed, host upmcrs:0x%x\n",
                        cmd->command, status);
                ret = (status != PWR_OK) ? status : -1;
        }
out:
        if (ret) {
                ufshcd_print_host_state(hba);
                ufshcd_print_pwr_info(hba);
                ufshcd_print_evt_hist(hba);
        }

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->active_uic_cmd = NULL;
        hba->uic_async_done = NULL;
        if (reenable_intr)
                ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
        if (ret) {
                ufshcd_set_link_broken(hba);
                ufshcd_schedule_eh_work(hba);
        }
out_unlock:
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        mutex_unlock(&hba->uic_cmd_mutex);

        return ret;
}

/**
 * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
 *                              using DME_SET primitives.
 * @hba: per adapter instance
 * @mode: powr mode value
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
{
        struct uic_command uic_cmd = {0};
        int ret;

        if (hba->quirks & UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP) {
                ret = ufshcd_dme_set(hba,
                                UIC_ARG_MIB_SEL(PA_RXHSUNTERMCAP, 0), 1);
                if (ret) {
                        dev_err(hba->dev, "%s: failed to enable PA_RXHSUNTERMCAP ret %d\n",
                                                __func__, ret);
                        goto out;
                }
        }

        uic_cmd.command = UIC_CMD_DME_SET;
        uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE);
        uic_cmd.argument3 = mode;
        ufshcd_hold(hba, false);
        ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
        ufshcd_release(hba);

out:
        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_uic_change_pwr_mode);

int ufshcd_link_recovery(struct ufs_hba *hba)
{
        int ret;
        unsigned long flags;

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->ufshcd_state = UFSHCD_STATE_RESET;
        ufshcd_set_eh_in_progress(hba);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        /* Reset the attached device */
        ufshcd_device_reset(hba);

        ret = ufshcd_host_reset_and_restore(hba);

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (ret)
                hba->ufshcd_state = UFSHCD_STATE_ERROR;
        ufshcd_clear_eh_in_progress(hba);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (ret)
                dev_err(hba->dev, "%s: link recovery failed, err %d",
                        __func__, ret);

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_link_recovery);

int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
        int ret;
        struct uic_command uic_cmd = {0};
        ktime_t start = ktime_get();

        ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, PRE_CHANGE);

        uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
        ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
        trace_ufshcd_profile_hibern8(dev_name(hba->dev), "enter",
                             ktime_to_us(ktime_sub(ktime_get(), start)), ret);

        if (ret)
                dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n",
                        __func__, ret);
        else
                ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER,
                                                                POST_CHANGE);

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_enter);

int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
{
        struct uic_command uic_cmd = {0};
        int ret;
        ktime_t start = ktime_get();

        ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, PRE_CHANGE);

        uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
        ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
        trace_ufshcd_profile_hibern8(dev_name(hba->dev), "exit",
                             ktime_to_us(ktime_sub(ktime_get(), start)), ret);

        if (ret) {
                dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n",
                        __func__, ret);
        } else {
                ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT,
                                                                POST_CHANGE);
                hba->ufs_stats.last_hibern8_exit_tstamp = ktime_get();
                hba->ufs_stats.hibern8_exit_cnt++;
        }

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_exit);

void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
{
        unsigned long flags;
        bool update = false;

        if (!ufshcd_is_auto_hibern8_supported(hba))
                return;

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (hba->ahit != ahit) {
                hba->ahit = ahit;
                update = true;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (update &&
            !pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) {
                ufshcd_rpm_get_sync(hba);
                ufshcd_hold(hba, false);
                ufshcd_auto_hibern8_enable(hba);
                ufshcd_release(hba);
                ufshcd_rpm_put_sync(hba);
        }
}
EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);

void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
{
        if (!ufshcd_is_auto_hibern8_supported(hba))
                return;

        ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
}

 /**
 * ufshcd_init_pwr_info - setting the POR (power on reset)
 * values in hba power info
 * @hba: per-adapter instance
 */
static void ufshcd_init_pwr_info(struct ufs_hba *hba)
{
        hba->pwr_info.gear_rx = UFS_PWM_G1;
        hba->pwr_info.gear_tx = UFS_PWM_G1;
        hba->pwr_info.lane_rx = 1;
        hba->pwr_info.lane_tx = 1;
        hba->pwr_info.pwr_rx = SLOWAUTO_MODE;
        hba->pwr_info.pwr_tx = SLOWAUTO_MODE;
        hba->pwr_info.hs_rate = 0;
}

/**
 * ufshcd_get_max_pwr_mode - reads the max power mode negotiated with device
 * @hba: per-adapter instance
 */
static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
{
        struct ufs_pa_layer_attr *pwr_info = &hba->max_pwr_info.info;

        if (hba->max_pwr_info.is_valid)
                return 0;

        if (hba->quirks & UFSHCD_QUIRK_HIBERN_FASTAUTO) {
                pwr_info->pwr_tx = FASTAUTO_MODE;
                pwr_info->pwr_rx = FASTAUTO_MODE;
        } else {
                pwr_info->pwr_tx = FAST_MODE;
                pwr_info->pwr_rx = FAST_MODE;
        }
        pwr_info->hs_rate = PA_HS_MODE_B;

        /* Get the connected lane count */
        ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDRXDATALANES),
                        &pwr_info->lane_rx);
        ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
                        &pwr_info->lane_tx);

        if (!pwr_info->lane_rx || !pwr_info->lane_tx) {
                dev_err(hba->dev, "%s: invalid connected lanes value. rx=%d, tx=%d\n",
                                __func__,
                                pwr_info->lane_rx,
                                pwr_info->lane_tx);
                return -EINVAL;
        }

        /*
         * First, get the maximum gears of HS speed.
         * If a zero value, it means there is no HSGEAR capability.
         * Then, get the maximum gears of PWM speed.
         */
        ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR), &pwr_info->gear_rx);
        if (!pwr_info->gear_rx) {
                ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
                                &pwr_info->gear_rx);
                if (!pwr_info->gear_rx) {
                        dev_err(hba->dev, "%s: invalid max pwm rx gear read = %d\n",
                                __func__, pwr_info->gear_rx);
                        return -EINVAL;
                }
                pwr_info->pwr_rx = SLOW_MODE;
        }

        ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR),
                        &pwr_info->gear_tx);
        if (!pwr_info->gear_tx) {
                ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
                                &pwr_info->gear_tx);
                if (!pwr_info->gear_tx) {
                        dev_err(hba->dev, "%s: invalid max pwm tx gear read = %d\n",
                                __func__, pwr_info->gear_tx);
                        return -EINVAL;
                }
                pwr_info->pwr_tx = SLOW_MODE;
        }

        hba->max_pwr_info.is_valid = true;
        return 0;
}

static int ufshcd_change_power_mode(struct ufs_hba *hba,
                             struct ufs_pa_layer_attr *pwr_mode)
{
        int ret;

        /* if already configured to the requested pwr_mode */
        if (!hba->force_pmc &&
            pwr_mode->gear_rx == hba->pwr_info.gear_rx &&
            pwr_mode->gear_tx == hba->pwr_info.gear_tx &&
            pwr_mode->lane_rx == hba->pwr_info.lane_rx &&
            pwr_mode->lane_tx == hba->pwr_info.lane_tx &&
            pwr_mode->pwr_rx == hba->pwr_info.pwr_rx &&
            pwr_mode->pwr_tx == hba->pwr_info.pwr_tx &&
            pwr_mode->hs_rate == hba->pwr_info.hs_rate) {
                dev_dbg(hba->dev, "%s: power already configured\n", __func__);
                return 0;
        }

        /*
         * Configure attributes for power mode change with below.
         * - PA_RXGEAR, PA_ACTIVERXDATALANES, PA_RXTERMINATION,
         * - PA_TXGEAR, PA_ACTIVETXDATALANES, PA_TXTERMINATION,
         * - PA_HSSERIES
         */
        ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), pwr_mode->gear_rx);
        ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
                        pwr_mode->lane_rx);
        if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
                        pwr_mode->pwr_rx == FAST_MODE)
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), true);
        else
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), false);

        ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), pwr_mode->gear_tx);
        ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
                        pwr_mode->lane_tx);
        if (pwr_mode->pwr_tx == FASTAUTO_MODE ||
                        pwr_mode->pwr_tx == FAST_MODE)
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), true);
        else
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), false);

        if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
            pwr_mode->pwr_tx == FASTAUTO_MODE ||
            pwr_mode->pwr_rx == FAST_MODE ||
            pwr_mode->pwr_tx == FAST_MODE)
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
                                                pwr_mode->hs_rate);

        if (!(hba->quirks & UFSHCD_QUIRK_SKIP_DEF_UNIPRO_TIMEOUT_SETTING)) {
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA0),
                                DL_FC0ProtectionTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA1),
                                DL_TC0ReplayTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA2),
                                DL_AFC0ReqTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA3),
                                DL_FC1ProtectionTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA4),
                                DL_TC1ReplayTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA5),
                                DL_AFC1ReqTimeOutVal_Default);

                ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalFC0ProtectionTimeOutVal),
                                DL_FC0ProtectionTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalTC0ReplayTimeOutVal),
                                DL_TC0ReplayTimeOutVal_Default);
                ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalAFC0ReqTimeOutVal),
                                DL_AFC0ReqTimeOutVal_Default);
        }

        ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
                        | pwr_mode->pwr_tx);

        if (ret) {
                dev_err(hba->dev,
                        "%s: power mode change failed %d\n", __func__, ret);
        } else {
                ufshcd_vops_pwr_change_notify(hba, POST_CHANGE, NULL,
                                                                pwr_mode);

                memcpy(&hba->pwr_info, pwr_mode,
                        sizeof(struct ufs_pa_layer_attr));
        }

        return ret;
}

/**
 * ufshcd_config_pwr_mode - configure a new power mode
 * @hba: per-adapter instance
 * @desired_pwr_mode: desired power configuration
 */
int ufshcd_config_pwr_mode(struct ufs_hba *hba,
                struct ufs_pa_layer_attr *desired_pwr_mode)
{
        struct ufs_pa_layer_attr final_params = { 0 };
        int ret;

        ret = ufshcd_vops_pwr_change_notify(hba, PRE_CHANGE,
                                        desired_pwr_mode, &final_params);

        if (ret)
                memcpy(&final_params, desired_pwr_mode, sizeof(final_params));

        ret = ufshcd_change_power_mode(hba, &final_params);

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_config_pwr_mode);

/**
 * ufshcd_complete_dev_init() - checks device readiness
 * @hba: per-adapter instance
 *
 * Set fDeviceInit flag and poll until device toggles it.
 */
static int ufshcd_complete_dev_init(struct ufs_hba *hba)
{
        int err;
        bool flag_res = true;
        ktime_t timeout;

        err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
                QUERY_FLAG_IDN_FDEVICEINIT, 0, NULL);
        if (err) {
                dev_err(hba->dev,
                        "%s setting fDeviceInit flag failed with error %d\n",
                        __func__, err);
                goto out;
        }

        /* Poll fDeviceInit flag to be cleared */
        timeout = ktime_add_ms(ktime_get(), FDEVICEINIT_COMPL_TIMEOUT);
        do {
                err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
                                        QUERY_FLAG_IDN_FDEVICEINIT, 0, &flag_res);
                if (!flag_res)
                        break;
                usleep_range(500, 1000);
        } while (ktime_before(ktime_get(), timeout));

        if (err) {
                dev_err(hba->dev,
                                "%s reading fDeviceInit flag failed with error %d\n",
                                __func__, err);
        } else if (flag_res) {
                dev_err(hba->dev,
                                "%s fDeviceInit was not cleared by the device\n",
                                __func__);
                err = -EBUSY;
        }
out:
        return err;
}

/**
 * ufshcd_make_hba_operational - Make UFS controller operational
 * @hba: per adapter instance
 *
 * To bring UFS host controller to operational state,
 * 1. Enable required interrupts
 * 2. Configure interrupt aggregation
 * 3. Program UTRL and UTMRL base address
 * 4. Configure run-stop-registers
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_make_hba_operational(struct ufs_hba *hba)
{
        int err = 0;
        u32 reg;

        /* Enable required interrupts */
        ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);

        /* Configure interrupt aggregation */
        if (ufshcd_is_intr_aggr_allowed(hba))
                ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
        else
                ufshcd_disable_intr_aggr(hba);

        /* Configure UTRL and UTMRL base address registers */
        ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
                        REG_UTP_TRANSFER_REQ_LIST_BASE_L);
        ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
                        REG_UTP_TRANSFER_REQ_LIST_BASE_H);
        ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
                        REG_UTP_TASK_REQ_LIST_BASE_L);
        ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
                        REG_UTP_TASK_REQ_LIST_BASE_H);

        /*
         * Make sure base address and interrupt setup are updated before
         * enabling the run/stop registers below.
         */
        wmb();

        /*
         * UCRDY, UTMRLDY and UTRLRDY bits must be 1
         */
        reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
        if (!(ufshcd_get_lists_status(reg))) {
                ufshcd_enable_run_stop_reg(hba);
        } else {
                dev_err(hba->dev,
                        "Host controller not ready to process requests");
                err = -EIO;
        }

        return err;
}
EXPORT_SYMBOL_GPL(ufshcd_make_hba_operational);

/**
 * ufshcd_hba_stop - Send controller to reset state
 * @hba: per adapter instance
 */
void ufshcd_hba_stop(struct ufs_hba *hba)
{
        unsigned long flags;
        int err;

        /*
         * Obtain the host lock to prevent that the controller is disabled
         * while the UFS interrupt handler is active on another CPU.
         */
        spin_lock_irqsave(hba->host->host_lock, flags);
        ufshcd_writel(hba, CONTROLLER_DISABLE,  REG_CONTROLLER_ENABLE);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        err = ufshcd_wait_for_register(hba, REG_CONTROLLER_ENABLE,
                                        CONTROLLER_ENABLE, CONTROLLER_DISABLE,
                                        10, 1);
        if (err)
                dev_err(hba->dev, "%s: Controller disable failed\n", __func__);
}
EXPORT_SYMBOL_GPL(ufshcd_hba_stop);

/**
 * ufshcd_hba_execute_hce - initialize the controller
 * @hba: per adapter instance
 *
 * The controller resets itself and controller firmware initialization
 * sequence kicks off. When controller is ready it will set
 * the Host Controller Enable bit to 1.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
{
        int retry_outer = 3;
        int retry_inner;

start:
        if (ufshcd_is_hba_active(hba))
                /* change controller state to "reset state" */
                ufshcd_hba_stop(hba);

        /* UniPro link is disabled at this point */
        ufshcd_set_link_off(hba);

        ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);

        /* start controller initialization sequence */
        ufshcd_hba_start(hba);

        /*
         * To initialize a UFS host controller HCE bit must be set to 1.
         * During initialization the HCE bit value changes from 1->0->1.
         * When the host controller completes initialization sequence
         * it sets the value of HCE bit to 1. The same HCE bit is read back
         * to check if the controller has completed initialization sequence.
         * So without this delay the value HCE = 1, set in the previous
         * instruction might be read back.
         * This delay can be changed based on the controller.
         */
        ufshcd_delay_us(hba->vps->hba_enable_delay_us, 100);

        /* wait for the host controller to complete initialization */
        retry_inner = 50;
        while (!ufshcd_is_hba_active(hba)) {
                if (retry_inner) {
                        retry_inner--;
                } else {
                        dev_err(hba->dev,
                                "Controller enable failed\n");
                        if (retry_outer) {
                                retry_outer--;
                                goto start;
                        }
                        return -EIO;
                }
                usleep_range(1000, 1100);
        }

        /* enable UIC related interrupts */
        ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);

        ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);

        return 0;
}

int ufshcd_hba_enable(struct ufs_hba *hba)
{
        int ret;

        if (hba->quirks & UFSHCI_QUIRK_BROKEN_HCE) {
                ufshcd_set_link_off(hba);
                ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);

                /* enable UIC related interrupts */
                ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
                ret = ufshcd_dme_reset(hba);
                if (!ret) {
                        ret = ufshcd_dme_enable(hba);
                        if (!ret)
                                ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
                        if (ret)
                                dev_err(hba->dev,
                                        "Host controller enable failed with non-hce\n");
                }
        } else {
                ret = ufshcd_hba_execute_hce(hba);
        }

        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_hba_enable);

static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
{
        int tx_lanes = 0, i, err = 0;

        if (!peer)
                ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
                               &tx_lanes);
        else
                ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
                                    &tx_lanes);
        for (i = 0; i < tx_lanes; i++) {
                if (!peer)
                        err = ufshcd_dme_set(hba,
                                UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
                                        UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
                                        0);
                else
                        err = ufshcd_dme_peer_set(hba,
                                UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
                                        UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
                                        0);
                if (err) {
                        dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d",
                                __func__, peer, i, err);
                        break;
                }
        }

        return err;
}

static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)
{
        return ufshcd_disable_tx_lcc(hba, true);
}

void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val)
{
        struct ufs_event_hist *e;

        if (id >= UFS_EVT_CNT)
                return;

        e = &hba->ufs_stats.event[id];
        e->val[e->pos] = val;
        e->tstamp[e->pos] = ktime_get();
        e->cnt += 1;
        e->pos = (e->pos + 1) % UFS_EVENT_HIST_LENGTH;

        ufshcd_vops_event_notify(hba, id, &val);
}
EXPORT_SYMBOL_GPL(ufshcd_update_evt_hist);

/**
 * ufshcd_link_startup - Initialize unipro link startup
 * @hba: per adapter instance
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_link_startup(struct ufs_hba *hba)
{
        int ret;
        int retries = DME_LINKSTARTUP_RETRIES;
        bool link_startup_again = false;

        /*
         * If UFS device isn't active then we will have to issue link startup
         * 2 times to make sure the device state move to active.
         */
        if (!ufshcd_is_ufs_dev_active(hba))
                link_startup_again = true;

link_startup:
        do {
                ufshcd_vops_link_startup_notify(hba, PRE_CHANGE);

                ret = ufshcd_dme_link_startup(hba);

                /* check if device is detected by inter-connect layer */
                if (!ret && !ufshcd_is_device_present(hba)) {
                        ufshcd_update_evt_hist(hba,
                                               UFS_EVT_LINK_STARTUP_FAIL,
                                               0);
                        dev_err(hba->dev, "%s: Device not present\n", __func__);
                        ret = -ENXIO;
                        goto out;
                }

                /*
                 * DME link lost indication is only received when link is up,
                 * but we can't be sure if the link is up until link startup
                 * succeeds. So reset the local Uni-Pro and try again.
                 */
                if (ret && retries && ufshcd_hba_enable(hba)) {
                        ufshcd_update_evt_hist(hba,
                                               UFS_EVT_LINK_STARTUP_FAIL,
                                               (u32)ret);
                        goto out;
                }
        } while (ret && retries--);

        if (ret) {
                /* failed to get the link up... retire */
                ufshcd_update_evt_hist(hba,
                                       UFS_EVT_LINK_STARTUP_FAIL,
                                       (u32)ret);
                goto out;
        }

        if (link_startup_again) {
                link_startup_again = false;
                retries = DME_LINKSTARTUP_RETRIES;
                goto link_startup;
        }

        /* Mark that link is up in PWM-G1, 1-lane, SLOW-AUTO mode */
        ufshcd_init_pwr_info(hba);
        ufshcd_print_pwr_info(hba);

        if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) {
                ret = ufshcd_disable_device_tx_lcc(hba);
                if (ret)
                        goto out;
        }

        /* Include any host controller configuration via UIC commands */
        ret = ufshcd_vops_link_startup_notify(hba, POST_CHANGE);
        if (ret)
                goto out;

        /* Clear UECPA once due to LINERESET has happened during LINK_STARTUP */
        ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
        ret = ufshcd_make_hba_operational(hba);
out:
        if (ret) {
                dev_err(hba->dev, "link startup failed %d\n", ret);
                ufshcd_print_host_state(hba);
                ufshcd_print_pwr_info(hba);
                ufshcd_print_evt_hist(hba);
        }
        return ret;
}

/**
 * ufshcd_verify_dev_init() - Verify device initialization
 * @hba: per-adapter instance
 *
 * Send NOP OUT UPIU and wait for NOP IN response to check whether the
 * device Transport Protocol (UTP) layer is ready after a reset.
 * If the UTP layer at the device side is not initialized, it may
 * not respond with NOP IN UPIU within timeout of %NOP_OUT_TIMEOUT
 * and we retry sending NOP OUT for %NOP_OUT_RETRIES iterations.
 */
static int ufshcd_verify_dev_init(struct ufs_hba *hba)
{
        int err = 0;
        int retries;

        ufshcd_hold(hba, false);
        mutex_lock(&hba->dev_cmd.lock);
        for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
                err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
                                          hba->nop_out_timeout);

                if (!err || err == -ETIMEDOUT)
                        break;

                dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
        }
        mutex_unlock(&hba->dev_cmd.lock);
        ufshcd_release(hba);

        if (err)
                dev_err(hba->dev, "%s: NOP OUT failed %d\n", __func__, err);
        return err;
}

/**
 * ufshcd_set_queue_depth - set lun queue depth
 * @sdev: pointer to SCSI device
 *
 * Read bLUQueueDepth value and activate scsi tagged command
 * queueing. For WLUN, queue depth is set to 1. For best-effort
 * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
 * value that host can queue.
 */
static void ufshcd_set_queue_depth(struct scsi_device *sdev)
{
        int ret = 0;
        u8 lun_qdepth;
        struct ufs_hba *hba;

        hba = shost_priv(sdev->host);

        lun_qdepth = hba->nutrs;
        ret = ufshcd_read_unit_desc_param(hba,
                                          ufshcd_scsi_to_upiu_lun(sdev->lun),
                                          UNIT_DESC_PARAM_LU_Q_DEPTH,
                                          &lun_qdepth,
                                          sizeof(lun_qdepth));

        /* Some WLUN doesn't support unit descriptor */
        if (ret == -EOPNOTSUPP)
                lun_qdepth = 1;
        else if (!lun_qdepth)
                /* eventually, we can figure out the real queue depth */
                lun_qdepth = hba->nutrs;
        else
                lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);

        dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
                        __func__, lun_qdepth);
        scsi_change_queue_depth(sdev, lun_qdepth);
}

/*
 * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
 * @hba: per-adapter instance
 * @lun: UFS device lun id
 * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
 *
 * Returns 0 in case of success and b_lu_write_protect status would be returned
 * @b_lu_write_protect parameter.
 * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
 * Returns -EINVAL in case of invalid parameters passed to this function.
 */
static int ufshcd_get_lu_wp(struct ufs_hba *hba,
                            u8 lun,
                            u8 *b_lu_write_protect)
{
        int ret;

        if (!b_lu_write_protect)
                ret = -EINVAL;
        /*
         * According to UFS device spec, RPMB LU can't be write
         * protected so skip reading bLUWriteProtect parameter for
         * it. For other W-LUs, UNIT DESCRIPTOR is not available.
         */
        else if (lun >= hba->dev_info.max_lu_supported)
                ret = -ENOTSUPP;
        else
                ret = ufshcd_read_unit_desc_param(hba,
                                          lun,
                                          UNIT_DESC_PARAM_LU_WR_PROTECT,
                                          b_lu_write_protect,
                                          sizeof(*b_lu_write_protect));
        return ret;
}

/**
 * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
 * status
 * @hba: per-adapter instance
 * @sdev: pointer to SCSI device
 *
 */
static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
                                                    const struct scsi_device *sdev)
{
        if (hba->dev_info.f_power_on_wp_en &&
            !hba->dev_info.is_lu_power_on_wp) {
                u8 b_lu_write_protect;

                if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
                                      &b_lu_write_protect) &&
                    (b_lu_write_protect == UFS_LU_POWER_ON_WP))
                        hba->dev_info.is_lu_power_on_wp = true;
        }
}

/**
 * ufshcd_setup_links - associate link b/w device wlun and other luns
 * @sdev: pointer to SCSI device
 * @hba: pointer to ufs hba
 */
static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
{
        struct device_link *link;

        /*
         * Device wlun is the supplier & rest of the luns are consumers.
         * This ensures that device wlun suspends after all other luns.
         */
        if (hba->ufs_device_wlun) {
                link = device_link_add(&sdev->sdev_gendev,
                                       &hba->ufs_device_wlun->sdev_gendev,
                                       DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
                if (!link) {
                        dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
                                dev_name(&hba->ufs_device_wlun->sdev_gendev));
                        return;
                }
                hba->luns_avail--;
                /* Ignore REPORT_LUN wlun probing */
                if (hba->luns_avail == 1) {
                        ufshcd_rpm_put(hba);
                        return;
                }
        } else {
                /*
                 * Device wlun is probed. The assumption is that WLUNs are
                 * scanned before other LUNs.
                 */
                hba->luns_avail--;
        }
}

/**
 * ufshcd_slave_alloc - handle initial SCSI device configurations
 * @sdev: pointer to SCSI device
 *
 * Returns success
 */
static int ufshcd_slave_alloc(struct scsi_device *sdev)
{
        struct ufs_hba *hba;

        hba = shost_priv(sdev->host);

        /* Mode sense(6) is not supported by UFS, so use Mode sense(10) */
        sdev->use_10_for_ms = 1;

        /* DBD field should be set to 1 in mode sense(10) */
        sdev->set_dbd_for_ms = 1;

        /* allow SCSI layer to restart the device in case of errors */
        sdev->allow_restart = 1;

        /* REPORT SUPPORTED OPERATION CODES is not supported */
        sdev->no_report_opcodes = 1;

        /* WRITE_SAME command is not supported */
        sdev->no_write_same = 1;

        ufshcd_set_queue_depth(sdev);

        ufshcd_get_lu_power_on_wp_status(hba, sdev);

        ufshcd_setup_links(hba, sdev);

        return 0;
}

/**
 * ufshcd_change_queue_depth - change queue depth
 * @sdev: pointer to SCSI device
 * @depth: required depth to set
 *
 * Change queue depth and make sure the max. limits are not crossed.
 */
static int ufshcd_change_queue_depth(struct scsi_device *sdev, int depth)
{
        return scsi_change_queue_depth(sdev, min(depth, sdev->host->can_queue));
}

static void ufshcd_hpb_destroy(struct ufs_hba *hba, struct scsi_device *sdev)
{
        /* skip well-known LU */
        if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) ||
            !(hba->dev_info.hpb_enabled) || !ufshpb_is_allowed(hba))
                return;

        ufshpb_destroy_lu(hba, sdev);
}

static void ufshcd_hpb_configure(struct ufs_hba *hba, struct scsi_device *sdev)
{
        /* skip well-known LU */
        if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) ||
            !(hba->dev_info.hpb_enabled) || !ufshpb_is_allowed(hba))
                return;

        ufshpb_init_hpb_lu(hba, sdev);
}

/**
 * ufshcd_slave_configure - adjust SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static int ufshcd_slave_configure(struct scsi_device *sdev)
{
        struct ufs_hba *hba = shost_priv(sdev->host);
        struct request_queue *q = sdev->request_queue;

        ufshcd_hpb_configure(hba, sdev);

        blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
        if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
                blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
        /*
         * Block runtime-pm until all consumers are added.
         * Refer ufshcd_setup_links().
         */
        if (is_device_wlun(sdev))
                pm_runtime_get_noresume(&sdev->sdev_gendev);
        else if (ufshcd_is_rpm_autosuspend_allowed(hba))
                sdev->rpm_autosuspend = 1;
        /*
         * Do not print messages during runtime PM to avoid never-ending cycles
         * of messages written back to storage by user space causing runtime
         * resume, causing more messages and so on.
         */
        sdev->silence_suspend = 1;

        ufshcd_crypto_register(hba, q);

        return 0;
}

/**
 * ufshcd_slave_destroy - remove SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static void ufshcd_slave_destroy(struct scsi_device *sdev)
{
        struct ufs_hba *hba;
        unsigned long flags;

        hba = shost_priv(sdev->host);

        ufshcd_hpb_destroy(hba, sdev);

        /* Drop the reference as it won't be needed anymore */
        if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) {
                spin_lock_irqsave(hba->host->host_lock, flags);
                hba->ufs_device_wlun = NULL;
                spin_unlock_irqrestore(hba->host->host_lock, flags);
        } else if (hba->ufs_device_wlun) {
                struct device *supplier = NULL;

                /* Ensure UFS Device WLUN exists and does not disappear */
                spin_lock_irqsave(hba->host->host_lock, flags);
                if (hba->ufs_device_wlun) {
                        supplier = &hba->ufs_device_wlun->sdev_gendev;
                        get_device(supplier);
                }
                spin_unlock_irqrestore(hba->host->host_lock, flags);

                if (supplier) {
                        /*
                         * If a LUN fails to probe (e.g. absent BOOT WLUN), the
                         * device will not have been registered but can still
                         * have a device link holding a reference to the device.
                         */
                        device_link_remove(&sdev->sdev_gendev, supplier);
                        put_device(supplier);
                }
        }
}

/**
 * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status
 * @lrbp: pointer to local reference block of completed command
 * @scsi_status: SCSI command status
 *
 * Returns value base on SCSI command status
 */
static inline int
ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
{
        int result = 0;

        switch (scsi_status) {
        case SAM_STAT_CHECK_CONDITION:
                ufshcd_copy_sense_data(lrbp);
                fallthrough;
        case SAM_STAT_GOOD:
                result |= DID_OK << 16 | scsi_status;
                break;
        case SAM_STAT_TASK_SET_FULL:
        case SAM_STAT_BUSY:
        case SAM_STAT_TASK_ABORTED:
                ufshcd_copy_sense_data(lrbp);
                result |= scsi_status;
                break;
        default:
                result |= DID_ERROR << 16;
                break;
        } /* end of switch */

        return result;
}

/**
 * ufshcd_transfer_rsp_status - Get overall status of the response
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block of completed command
 *
 * Returns result of the command to notify SCSI midlayer
 */
static inline int
ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
        int result = 0;
        int scsi_status;
        enum utp_ocs ocs;

        /* overall command status of utrd */
        ocs = ufshcd_get_tr_ocs(lrbp);

        if (hba->quirks & UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR) {
                if (be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_1) &
                                        MASK_RSP_UPIU_RESULT)
                        ocs = OCS_SUCCESS;
        }

        switch (ocs) {
        case OCS_SUCCESS:
                result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
                hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
                switch (result) {
                case UPIU_TRANSACTION_RESPONSE:
                        /*
                         * get the response UPIU result to extract
                         * the SCSI command status
                         */
                        result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);

                        /*
                         * get the result based on SCSI status response
                         * to notify the SCSI midlayer of the command status
                         */
                        scsi_status = result & MASK_SCSI_STATUS;
                        result = ufshcd_scsi_cmd_status(lrbp, scsi_status);

                        /*
                         * Currently we are only supporting BKOPs exception
                         * events hence we can ignore BKOPs exception event
                         * during power management callbacks. BKOPs exception
                         * event is not expected to be raised in runtime suspend
                         * callback as it allows the urgent bkops.
                         * During system suspend, we are anyway forcefully
                         * disabling the bkops and if urgent bkops is needed
                         * it will be enabled on system resume. Long term
                         * solution could be to abort the system suspend if
                         * UFS device needs urgent BKOPs.
                         */
                        if (!hba->pm_op_in_progress &&
                            !ufshcd_eh_in_progress(hba) &&
                            ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
                                /* Flushed in suspend */
                                schedule_work(&hba->eeh_work);

                        if (scsi_status == SAM_STAT_GOOD)
                                ufshpb_rsp_upiu(hba, lrbp);
                        break;
                case UPIU_TRANSACTION_REJECT_UPIU:
                        /* TODO: handle Reject UPIU Response */
                        result = DID_ERROR << 16;
                        dev_err(hba->dev,
                                "Reject UPIU not fully implemented\n");
                        break;
                default:
                        dev_err(hba->dev,
                                "Unexpected request response code = %x\n",
                                result);
                        result = DID_ERROR << 16;
                        break;
                }
                break;
        case OCS_ABORTED:
                result |= DID_ABORT << 16;
                break;
        case OCS_INVALID_COMMAND_STATUS:
                result |= DID_REQUEUE << 16;
                break;
        case OCS_INVALID_CMD_TABLE_ATTR:
        case OCS_INVALID_PRDT_ATTR:
        case OCS_MISMATCH_DATA_BUF_SIZE:
        case OCS_MISMATCH_RESP_UPIU_SIZE:
        case OCS_PEER_COMM_FAILURE:
        case OCS_FATAL_ERROR:
        case OCS_DEVICE_FATAL_ERROR:
        case OCS_INVALID_CRYPTO_CONFIG:
        case OCS_GENERAL_CRYPTO_ERROR:
        default:
                result |= DID_ERROR << 16;
                dev_err(hba->dev,
                                "OCS error from controller = %x for tag %d\n",
                                ocs, lrbp->task_tag);
                ufshcd_print_evt_hist(hba);
                ufshcd_print_host_state(hba);
                break;
        } /* end of switch */

        if ((host_byte(result) != DID_OK) &&
            (host_byte(result) != DID_REQUEUE) && !hba->silence_err_logs)
                ufshcd_print_trs(hba, 1 << lrbp->task_tag, true);
        return result;
}

static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
                                         u32 intr_mask)
{
        if (!ufshcd_is_auto_hibern8_supported(hba) ||
            !ufshcd_is_auto_hibern8_enabled(hba))
                return false;

        if (!(intr_mask & UFSHCD_UIC_HIBERN8_MASK))
                return false;

        if (hba->active_uic_cmd &&
            (hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_ENTER ||
            hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_EXIT))
                return false;

        return true;
}

/**
 * ufshcd_uic_cmd_compl - handle completion of uic command
 * @hba: per adapter instance
 * @intr_status: interrupt status generated by the controller
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
{
        irqreturn_t retval = IRQ_NONE;

        spin_lock(hba->host->host_lock);
        if (ufshcd_is_auto_hibern8_error(hba, intr_status))
                hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status);

        if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
                hba->active_uic_cmd->argument2 |=
                        ufshcd_get_uic_cmd_result(hba);
                hba->active_uic_cmd->argument3 =
                        ufshcd_get_dme_attr_val(hba);
                if (!hba->uic_async_done)
                        hba->active_uic_cmd->cmd_active = 0;
                complete(&hba->active_uic_cmd->done);
                retval = IRQ_HANDLED;
        }

        if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) {
                hba->active_uic_cmd->cmd_active = 0;
                complete(hba->uic_async_done);
                retval = IRQ_HANDLED;
        }

        if (retval == IRQ_HANDLED)
                ufshcd_add_uic_command_trace(hba, hba->active_uic_cmd,
                                             UFS_CMD_COMP);
        spin_unlock(hba->host->host_lock);
        return retval;
}

/* Release the resources allocated for processing a SCSI command. */
static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
                                    struct ufshcd_lrb *lrbp)
{
        struct scsi_cmnd *cmd = lrbp->cmd;

        scsi_dma_unmap(cmd);
        lrbp->cmd = NULL;       /* Mark the command as completed. */
        ufshcd_release(hba);
        ufshcd_clk_scaling_update_busy(hba);
}

/**
 * __ufshcd_transfer_req_compl - handle SCSI and query command completion
 * @hba: per adapter instance
 * @completed_reqs: bitmask that indicates which requests to complete
 */
static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
                                        unsigned long completed_reqs)
{
        struct ufshcd_lrb *lrbp;
        struct scsi_cmnd *cmd;
        int index;

        for_each_set_bit(index, &completed_reqs, hba->nutrs) {
                lrbp = &hba->lrb[index];
                lrbp->compl_time_stamp = ktime_get();
                cmd = lrbp->cmd;
                if (cmd) {
                        if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
                                ufshcd_update_monitor(hba, lrbp);
                        ufshcd_add_command_trace(hba, index, UFS_CMD_COMP);
                        cmd->result = ufshcd_transfer_rsp_status(hba, lrbp);
                        ufshcd_release_scsi_cmd(hba, lrbp);
                        /* Do not touch lrbp after scsi done */
                        scsi_done(cmd);
                } else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
                        lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
                        if (hba->dev_cmd.complete) {
                                ufshcd_add_command_trace(hba, index,
                                                         UFS_DEV_COMP);
                                complete(hba->dev_cmd.complete);
                                ufshcd_clk_scaling_update_busy(hba);
                        }
                }
        }
}

/*
 * Returns > 0 if one or more commands have been completed or 0 if no
 * requests have been completed.
 */
static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num)
{
        struct ufs_hba *hba = shost_priv(shost);
        unsigned long completed_reqs, flags;
        u32 tr_doorbell;

        spin_lock_irqsave(&hba->outstanding_lock, flags);
        tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        completed_reqs = ~tr_doorbell & hba->outstanding_reqs;
        WARN_ONCE(completed_reqs & ~hba->outstanding_reqs,
                  "completed: %#lx; outstanding: %#lx\n", completed_reqs,
                  hba->outstanding_reqs);
        hba->outstanding_reqs &= ~completed_reqs;
        spin_unlock_irqrestore(&hba->outstanding_lock, flags);

        if (completed_reqs)
                __ufshcd_transfer_req_compl(hba, completed_reqs);

        return completed_reqs;
}

/**
 * ufshcd_transfer_req_compl - handle SCSI and query command completion
 * @hba: per adapter instance
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
{
        /* Resetting interrupt aggregation counters first and reading the
         * DOOR_BELL afterward allows us to handle all the completed requests.
         * In order to prevent other interrupts starvation the DB is read once
         * after reset. The down side of this solution is the possibility of
         * false interrupt if device completes another request after resetting
         * aggregation and before reading the DB.
         */
        if (ufshcd_is_intr_aggr_allowed(hba) &&
            !(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
                ufshcd_reset_intr_aggr(hba);

        if (ufs_fail_completion())
                return IRQ_HANDLED;

        /*
         * Ignore the ufshcd_poll() return value and return IRQ_HANDLED since we
         * do not want polling to trigger spurious interrupt complaints.
         */
        ufshcd_poll(hba->host, 0);

        return IRQ_HANDLED;
}

int __ufshcd_write_ee_control(struct ufs_hba *hba, u32 ee_ctrl_mask)
{
        return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
                                       QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
                                       &ee_ctrl_mask);
}

int ufshcd_write_ee_control(struct ufs_hba *hba)
{
        int err;

        mutex_lock(&hba->ee_ctrl_mutex);
        err = __ufshcd_write_ee_control(hba, hba->ee_ctrl_mask);
        mutex_unlock(&hba->ee_ctrl_mutex);
        if (err)
                dev_err(hba->dev, "%s: failed to write ee control %d\n",
                        __func__, err);
        return err;
}

int ufshcd_update_ee_control(struct ufs_hba *hba, u16 *mask,
                             const u16 *other_mask, u16 set, u16 clr)
{
        u16 new_mask, ee_ctrl_mask;
        int err = 0;

        mutex_lock(&hba->ee_ctrl_mutex);
        new_mask = (*mask & ~clr) | set;
        ee_ctrl_mask = new_mask | *other_mask;
        if (ee_ctrl_mask != hba->ee_ctrl_mask)
                err = __ufshcd_write_ee_control(hba, ee_ctrl_mask);
        /* Still need to update 'mask' even if 'ee_ctrl_mask' was unchanged */
        if (!err) {
                hba->ee_ctrl_mask = ee_ctrl_mask;
                *mask = new_mask;
        }
        mutex_unlock(&hba->ee_ctrl_mutex);
        return err;
}

/**
 * ufshcd_disable_ee - disable exception event
 * @hba: per-adapter instance
 * @mask: exception event to disable
 *
 * Disables exception event in the device so that the EVENT_ALERT
 * bit is not set.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static inline int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
{
        return ufshcd_update_ee_drv_mask(hba, 0, mask);
}

/**
 * ufshcd_enable_ee - enable exception event
 * @hba: per-adapter instance
 * @mask: exception event to enable
 *
 * Enable corresponding exception event in the device to allow
 * device to alert host in critical scenarios.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static inline int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
{
        return ufshcd_update_ee_drv_mask(hba, mask, 0);
}

/**
 * ufshcd_enable_auto_bkops - Allow device managed BKOPS
 * @hba: per-adapter instance
 *
 * Allow device to manage background operations on its own. Enabling
 * this might lead to inconsistent latencies during normal data transfers
 * as the device is allowed to manage its own way of handling background
 * operations.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
{
        int err = 0;

        if (hba->auto_bkops_enabled)
                goto out;

        err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
                        QUERY_FLAG_IDN_BKOPS_EN, 0, NULL);
        if (err) {
                dev_err(hba->dev, "%s: failed to enable bkops %d\n",
                                __func__, err);
                goto out;
        }

        hba->auto_bkops_enabled = true;
        trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Enabled");

        /* No need of URGENT_BKOPS exception from the device */
        err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
        if (err)
                dev_err(hba->dev, "%s: failed to disable exception event %d\n",
                                __func__, err);
out:
        return err;
}

/**
 * ufshcd_disable_auto_bkops - block device in doing background operations
 * @hba: per-adapter instance
 *
 * Disabling background operations improves command response latency but
 * has drawback of device moving into critical state where the device is
 * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
 * host is idle so that BKOPS are managed effectively without any negative
 * impacts.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
{
        int err = 0;

        if (!hba->auto_bkops_enabled)
                goto out;

        /*
         * If host assisted BKOPs is to be enabled, make sure
         * urgent bkops exception is allowed.
         */
        err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
        if (err) {
                dev_err(hba->dev, "%s: failed to enable exception event %d\n",
                                __func__, err);
                goto out;
        }

        err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
                        QUERY_FLAG_IDN_BKOPS_EN, 0, NULL);
        if (err) {
                dev_err(hba->dev, "%s: failed to disable bkops %d\n",
                                __func__, err);
                ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
                goto out;
        }

        hba->auto_bkops_enabled = false;
        trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Disabled");
        hba->is_urgent_bkops_lvl_checked = false;
out:
        return err;
}

/**
 * ufshcd_force_reset_auto_bkops - force reset auto bkops state
 * @hba: per adapter instance
 *
 * After a device reset the device may toggle the BKOPS_EN flag
 * to default value. The s/w tracking variables should be updated
 * as well. This function would change the auto-bkops state based on
 * UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND.
 */
static void ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
{
        if (ufshcd_keep_autobkops_enabled_except_suspend(hba)) {
                hba->auto_bkops_enabled = false;
                hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
                ufshcd_enable_auto_bkops(hba);
        } else {
                hba->auto_bkops_enabled = true;
                hba->ee_ctrl_mask &= ~MASK_EE_URGENT_BKOPS;
                ufshcd_disable_auto_bkops(hba);
        }
        hba->urgent_bkops_lvl = BKOPS_STATUS_PERF_IMPACT;
        hba->is_urgent_bkops_lvl_checked = false;
}

static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
{
        return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                        QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
}

/**
 * ufshcd_bkops_ctrl - control the auto bkops based on current bkops status
 * @hba: per-adapter instance
 * @status: bkops_status value
 *
 * Read the bkops_status from the UFS device and Enable fBackgroundOpsEn
 * flag in the device to permit background operations if the device
 * bkops_status is greater than or equal to "status" argument passed to
 * this function, disable otherwise.
 *
 * Returns 0 for success, non-zero in case of failure.
 *
 * NOTE: Caller of this function can check the "hba->auto_bkops_enabled" flag
 * to know whether auto bkops is enabled or disabled after this function
 * returns control to it.
 */
static int ufshcd_bkops_ctrl(struct ufs_hba *hba,
                             enum bkops_status status)
{
        int err;
        u32 curr_status = 0;

        err = ufshcd_get_bkops_status(hba, &curr_status);
        if (err) {
                dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
                                __func__, err);
                goto out;
        } else if (curr_status > BKOPS_STATUS_MAX) {
                dev_err(hba->dev, "%s: invalid BKOPS status %d\n",
                                __func__, curr_status);
                err = -EINVAL;
                goto out;
        }

        if (curr_status >= status)
                err = ufshcd_enable_auto_bkops(hba);
        else
                err = ufshcd_disable_auto_bkops(hba);
out:
        return err;
}

/**
 * ufshcd_urgent_bkops - handle urgent bkops exception event
 * @hba: per-adapter instance
 *
 * Enable fBackgroundOpsEn flag in the device to permit background
 * operations.
 *
 * If BKOPs is enabled, this function returns 0, 1 if the bkops in not enabled
 * and negative error value for any other failure.
 */
static int ufshcd_urgent_bkops(struct ufs_hba *hba)
{
        return ufshcd_bkops_ctrl(hba, hba->urgent_bkops_lvl);
}

static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
{
        return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                        QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
}

static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
{
        int err;
        u32 curr_status = 0;

        if (hba->is_urgent_bkops_lvl_checked)
                goto enable_auto_bkops;

        err = ufshcd_get_bkops_status(hba, &curr_status);
        if (err) {
                dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
                                __func__, err);
                goto out;
        }

        /*
         * We are seeing that some devices are raising the urgent bkops
         * exception events even when BKOPS status doesn't indicate performace
         * impacted or critical. Handle these device by determining their urgent
         * bkops status at runtime.
         */
        if (curr_status < BKOPS_STATUS_PERF_IMPACT) {
                dev_err(hba->dev, "%s: device raised urgent BKOPS exception for bkops status %d\n",
                                __func__, curr_status);
                /* update the current status as the urgent bkops level */
                hba->urgent_bkops_lvl = curr_status;
                hba->is_urgent_bkops_lvl_checked = true;
        }

enable_auto_bkops:
        err = ufshcd_enable_auto_bkops(hba);
out:
        if (err < 0)
                dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
                                __func__, err);
}

static void ufshcd_temp_exception_event_handler(struct ufs_hba *hba, u16 status)
{
        u32 value;

        if (ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                                QUERY_ATTR_IDN_CASE_ROUGH_TEMP, 0, 0, &value))
                return;

        dev_info(hba->dev, "exception Tcase %d\n", value - 80);

        ufs_hwmon_notify_event(hba, status & MASK_EE_URGENT_TEMP);

        /*
         * A placeholder for the platform vendors to add whatever additional
         * steps required
         */
}

static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn idn)
{
        u8 index;
        enum query_opcode opcode = set ? UPIU_QUERY_OPCODE_SET_FLAG :
                                   UPIU_QUERY_OPCODE_CLEAR_FLAG;

        index = ufshcd_wb_get_query_index(hba);
        return ufshcd_query_flag_retry(hba, opcode, idn, index, NULL);
}

int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable)
{
        int ret;

        if (!ufshcd_is_wb_allowed(hba))
                return 0;

        if (!(enable ^ hba->dev_info.wb_enabled))
                return 0;

        ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_EN);
        if (ret) {
                dev_err(hba->dev, "%s Write Booster %s failed %d\n",
                        __func__, enable ? "enable" : "disable", ret);
                return ret;
        }

        hba->dev_info.wb_enabled = enable;
        dev_info(hba->dev, "%s Write Booster %s\n",
                        __func__, enable ? "enabled" : "disabled");

        return ret;
}

static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
{
        int ret;

        ret = __ufshcd_wb_toggle(hba, set,
                        QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8);
        if (ret) {
                dev_err(hba->dev, "%s: WB-Buf Flush during H8 %s failed: %d\n",
                        __func__, set ? "enable" : "disable", ret);
                return;
        }
        dev_dbg(hba->dev, "%s WB-Buf Flush during H8 %s\n",
                        __func__, set ? "enabled" : "disabled");
}

static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
{
        int ret;

        if (!ufshcd_is_wb_allowed(hba) ||
            hba->dev_info.wb_buf_flush_enabled == enable)
                return;

        ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN);
        if (ret) {
                dev_err(hba->dev, "%s WB-Buf Flush %s failed %d\n", __func__,
                        enable ? "enable" : "disable", ret);
                return;
        }

        hba->dev_info.wb_buf_flush_enabled = enable;

        dev_dbg(hba->dev, "%s WB-Buf Flush %s\n",
                        __func__, enable ? "enabled" : "disabled");
}

static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
                                                u32 avail_buf)
{
        u32 cur_buf;
        int ret;
        u8 index;

        index = ufshcd_wb_get_query_index(hba);
        ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                                              QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE,
                                              index, 0, &cur_buf);
        if (ret) {
                dev_err(hba->dev, "%s dCurWriteBoosterBufferSize read failed %d\n",
                        __func__, ret);
                return false;
        }

        if (!cur_buf) {
                dev_info(hba->dev, "dCurWBBuf: %d WB disabled until free-space is available\n",
                         cur_buf);
                return false;
        }
        /* Let it continue to flush when available buffer exceeds threshold */
        return avail_buf < hba->vps->wb_flush_threshold;
}

static void ufshcd_wb_force_disable(struct ufs_hba *hba)
{
        if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
                ufshcd_wb_toggle_flush(hba, false);

        ufshcd_wb_toggle_flush_during_h8(hba, false);
        ufshcd_wb_toggle(hba, false);
        hba->caps &= ~UFSHCD_CAP_WB_EN;

        dev_info(hba->dev, "%s: WB force disabled\n", __func__);
}

static bool ufshcd_is_wb_buf_lifetime_available(struct ufs_hba *hba)
{
        u32 lifetime;
        int ret;
        u8 index;

        index = ufshcd_wb_get_query_index(hba);
        ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                                      QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST,
                                      index, 0, &lifetime);
        if (ret) {
                dev_err(hba->dev,
                        "%s: bWriteBoosterBufferLifeTimeEst read failed %d\n",
                        __func__, ret);
                return false;
        }

        if (lifetime == UFS_WB_EXCEED_LIFETIME) {
                dev_err(hba->dev, "%s: WB buf lifetime is exhausted 0x%02X\n",
                        __func__, lifetime);
                return false;
        }

        dev_dbg(hba->dev, "%s: WB buf lifetime is 0x%02X\n",
                __func__, lifetime);

        return true;
}

static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
{
        int ret;
        u32 avail_buf;
        u8 index;

        if (!ufshcd_is_wb_allowed(hba))
                return false;

        if (!ufshcd_is_wb_buf_lifetime_available(hba)) {
                ufshcd_wb_force_disable(hba);
                return false;
        }

        /*
         * The ufs device needs the vcc to be ON to flush.
         * With user-space reduction enabled, it's enough to enable flush
         * by checking only the available buffer. The threshold
         * defined here is > 90% full.
         * With user-space preserved enabled, the current-buffer
         * should be checked too because the wb buffer size can reduce
         * when disk tends to be full. This info is provided by current
         * buffer (dCurrentWriteBoosterBufferSize). There's no point in
         * keeping vcc on when current buffer is empty.
         */
        index = ufshcd_wb_get_query_index(hba);
        ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                                      QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE,
                                      index, 0, &avail_buf);
        if (ret) {
                dev_warn(hba->dev, "%s dAvailableWriteBoosterBufferSize read failed %d\n",
                         __func__, ret);
                return false;
        }

        if (!hba->dev_info.b_presrv_uspc_en)
                return avail_buf <= UFS_WB_BUF_REMAIN_PERCENT(10);

        return ufshcd_wb_presrv_usrspc_keep_vcc_on(hba, avail_buf);
}

static void ufshcd_rpm_dev_flush_recheck_work(struct work_struct *work)
{
        struct ufs_hba *hba = container_of(to_delayed_work(work),
                                           struct ufs_hba,
                                           rpm_dev_flush_recheck_work);
        /*
         * To prevent unnecessary VCC power drain after device finishes
         * WriteBooster buffer flush or Auto BKOPs, force runtime resume
         * after a certain delay to recheck the threshold by next runtime
         * suspend.
         */
        ufshcd_rpm_get_sync(hba);
        ufshcd_rpm_put_sync(hba);
}

/**
 * ufshcd_exception_event_handler - handle exceptions raised by device
 * @work: pointer to work data
 *
 * Read bExceptionEventStatus attribute from the device and handle the
 * exception event accordingly.
 */
static void ufshcd_exception_event_handler(struct work_struct *work)
{
        struct ufs_hba *hba;
        int err;
        u32 status = 0;
        hba = container_of(work, struct ufs_hba, eeh_work);

        ufshcd_scsi_block_requests(hba);
        err = ufshcd_get_ee_status(hba, &status);
        if (err) {
                dev_err(hba->dev, "%s: failed to get exception status %d\n",
                                __func__, err);
                goto out;
        }

        trace_ufshcd_exception_event(dev_name(hba->dev), status);

        if (status & hba->ee_drv_mask & MASK_EE_URGENT_BKOPS)
                ufshcd_bkops_exception_event_handler(hba);

        if (status & hba->ee_drv_mask & MASK_EE_URGENT_TEMP)
                ufshcd_temp_exception_event_handler(hba, status);

        ufs_debugfs_exception_event(hba, status);
out:
        ufshcd_scsi_unblock_requests(hba);
}

/* Complete requests that have door-bell cleared */
static void ufshcd_complete_requests(struct ufs_hba *hba)
{
        ufshcd_transfer_req_compl(hba);
        ufshcd_tmc_handler(hba);
}

/**
 * ufshcd_quirk_dl_nac_errors - This function checks if error handling is
 *                              to recover from the DL NAC errors or not.
 * @hba: per-adapter instance
 *
 * Returns true if error handling is required, false otherwise
 */
static bool ufshcd_quirk_dl_nac_errors(struct ufs_hba *hba)
{
        unsigned long flags;
        bool err_handling = true;

        spin_lock_irqsave(hba->host->host_lock, flags);
        /*
         * UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS only workaround the
         * device fatal error and/or DL NAC & REPLAY timeout errors.
         */
        if (hba->saved_err & (CONTROLLER_FATAL_ERROR | SYSTEM_BUS_FATAL_ERROR))
                goto out;

        if ((hba->saved_err & DEVICE_FATAL_ERROR) ||
            ((hba->saved_err & UIC_ERROR) &&
             (hba->saved_uic_err & UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))
                goto out;

        if ((hba->saved_err & UIC_ERROR) &&
            (hba->saved_uic_err & UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)) {
                int err;
                /*
                 * wait for 50ms to see if we can get any other errors or not.
                 */
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                msleep(50);
                spin_lock_irqsave(hba->host->host_lock, flags);

                /*
                 * now check if we have got any other severe errors other than
                 * DL NAC error?
                 */
                if ((hba->saved_err & INT_FATAL_ERRORS) ||
                    ((hba->saved_err & UIC_ERROR) &&
                    (hba->saved_uic_err & ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)))
                        goto out;

                /*
                 * As DL NAC is the only error received so far, send out NOP
                 * command to confirm if link is still active or not.
                 *   - If we don't get any response then do error recovery.
                 *   - If we get response then clear the DL NAC error bit.
                 */

                spin_unlock_irqrestore(hba->host->host_lock, flags);
                err = ufshcd_verify_dev_init(hba);
                spin_lock_irqsave(hba->host->host_lock, flags);

                if (err)
                        goto out;

                /* Link seems to be alive hence ignore the DL NAC errors */
                if (hba->saved_uic_err == UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)
                        hba->saved_err &= ~UIC_ERROR;
                /* clear NAC error */
                hba->saved_uic_err &= ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
                if (!hba->saved_uic_err)
                        err_handling = false;
        }
out:
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        return err_handling;
}

/* host lock must be held before calling this func */
static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba)
{
        return (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR) ||
               (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK));
}

void ufshcd_schedule_eh_work(struct ufs_hba *hba)
{
        lockdep_assert_held(hba->host->host_lock);

        /* handle fatal errors only when link is not in error state */
        if (hba->ufshcd_state != UFSHCD_STATE_ERROR) {
                if (hba->force_reset || ufshcd_is_link_broken(hba) ||
                    ufshcd_is_saved_err_fatal(hba))
                        hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_FATAL;
                else
                        hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_NON_FATAL;
                queue_work(hba->eh_wq, &hba->eh_work);
        }
}

static void ufshcd_clk_scaling_allow(struct ufs_hba *hba, bool allow)
{
        down_write(&hba->clk_scaling_lock);
        hba->clk_scaling.is_allowed = allow;
        up_write(&hba->clk_scaling_lock);
}

static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend)
{
        if (suspend) {
                if (hba->clk_scaling.is_enabled)
                        ufshcd_suspend_clkscaling(hba);
                ufshcd_clk_scaling_allow(hba, false);
        } else {
                ufshcd_clk_scaling_allow(hba, true);
                if (hba->clk_scaling.is_enabled)
                        ufshcd_resume_clkscaling(hba);
        }
}

static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
{
        ufshcd_rpm_get_sync(hba);
        if (pm_runtime_status_suspended(&hba->ufs_device_wlun->sdev_gendev) ||
            hba->is_sys_suspended) {
                enum ufs_pm_op pm_op;

                /*
                 * Don't assume anything of resume, if
                 * resume fails, irq and clocks can be OFF, and powers
                 * can be OFF or in LPM.
                 */
                ufshcd_setup_hba_vreg(hba, true);
                ufshcd_enable_irq(hba);
                ufshcd_setup_vreg(hba, true);
                ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
                ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
                ufshcd_hold(hba, false);
                if (!ufshcd_is_clkgating_allowed(hba))
                        ufshcd_setup_clocks(hba, true);
                ufshcd_release(hba);
                pm_op = hba->is_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
                ufshcd_vops_resume(hba, pm_op);
        } else {
                ufshcd_hold(hba, false);
                if (ufshcd_is_clkscaling_supported(hba) &&
                    hba->clk_scaling.is_enabled)
                        ufshcd_suspend_clkscaling(hba);
                ufshcd_clk_scaling_allow(hba, false);
        }
        ufshcd_scsi_block_requests(hba);
        /* Drain ufshcd_queuecommand() */
        synchronize_rcu();
        cancel_work_sync(&hba->eeh_work);
}

static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
{
        ufshcd_scsi_unblock_requests(hba);
        ufshcd_release(hba);
        if (ufshcd_is_clkscaling_supported(hba))
                ufshcd_clk_scaling_suspend(hba, false);
        ufshcd_rpm_put(hba);
}

static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
{
        return (!hba->is_powered || hba->shutting_down ||
                !hba->ufs_device_wlun ||
                hba->ufshcd_state == UFSHCD_STATE_ERROR ||
                (!(hba->saved_err || hba->saved_uic_err || hba->force_reset ||
                   ufshcd_is_link_broken(hba))));
}

#ifdef CONFIG_PM
static void ufshcd_recover_pm_error(struct ufs_hba *hba)
{
        struct Scsi_Host *shost = hba->host;
        struct scsi_device *sdev;
        struct request_queue *q;
        int ret;

        hba->is_sys_suspended = false;
        /*
         * Set RPM status of wlun device to RPM_ACTIVE,
         * this also clears its runtime error.
         */
        ret = pm_runtime_set_active(&hba->ufs_device_wlun->sdev_gendev);

        /* hba device might have a runtime error otherwise */
        if (ret)
                ret = pm_runtime_set_active(hba->dev);
        /*
         * If wlun device had runtime error, we also need to resume those
         * consumer scsi devices in case any of them has failed to be
         * resumed due to supplier runtime resume failure. This is to unblock
         * blk_queue_enter in case there are bios waiting inside it.
         */
        if (!ret) {
                shost_for_each_device(sdev, shost) {
                        q = sdev->request_queue;
                        if (q->dev && (q->rpm_status == RPM_SUSPENDED ||
                                       q->rpm_status == RPM_SUSPENDING))
                                pm_request_resume(q->dev);
                }
        }
}
#else
static inline void ufshcd_recover_pm_error(struct ufs_hba *hba)
{
}
#endif

static bool ufshcd_is_pwr_mode_restore_needed(struct ufs_hba *hba)
{
        struct ufs_pa_layer_attr *pwr_info = &hba->pwr_info;
        u32 mode;

        ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PWRMODE), &mode);

        if (pwr_info->pwr_rx != ((mode >> PWRMODE_RX_OFFSET) & PWRMODE_MASK))
                return true;

        if (pwr_info->pwr_tx != (mode & PWRMODE_MASK))
                return true;

        return false;
}

/**
 * ufshcd_err_handler - handle UFS errors that require s/w attention
 * @work: pointer to work structure
 */
static void ufshcd_err_handler(struct work_struct *work)
{
        int retries = MAX_ERR_HANDLER_RETRIES;
        struct ufs_hba *hba;
        unsigned long flags;
        bool needs_restore;
        bool needs_reset;
        bool err_xfer;
        bool err_tm;
        int pmc_err;
        int tag;

        hba = container_of(work, struct ufs_hba, eh_work);

        dev_info(hba->dev,
                 "%s started; HBA state %s; powered %d; shutting down %d; saved_err = %d; saved_uic_err = %d; force_reset = %d%s\n",
                 __func__, ufshcd_state_name[hba->ufshcd_state],
                 hba->is_powered, hba->shutting_down, hba->saved_err,
                 hba->saved_uic_err, hba->force_reset,
                 ufshcd_is_link_broken(hba) ? "; link is broken" : "");

        down(&hba->host_sem);
        spin_lock_irqsave(hba->host->host_lock, flags);
        if (ufshcd_err_handling_should_stop(hba)) {
                if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
                        hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                up(&hba->host_sem);
                return;
        }
        ufshcd_set_eh_in_progress(hba);
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        ufshcd_err_handling_prepare(hba);
        /* Complete requests that have door-bell cleared by h/w */
        ufshcd_complete_requests(hba);
        spin_lock_irqsave(hba->host->host_lock, flags);
again:
        needs_restore = false;
        needs_reset = false;
        err_xfer = false;
        err_tm = false;

        if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
                hba->ufshcd_state = UFSHCD_STATE_RESET;
        /*
         * A full reset and restore might have happened after preparation
         * is finished, double check whether we should stop.
         */
        if (ufshcd_err_handling_should_stop(hba))
                goto skip_err_handling;

        if (hba->dev_quirks & UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
                bool ret;

                spin_unlock_irqrestore(hba->host->host_lock, flags);
                /* release the lock as ufshcd_quirk_dl_nac_errors() may sleep */
                ret = ufshcd_quirk_dl_nac_errors(hba);
                spin_lock_irqsave(hba->host->host_lock, flags);
                if (!ret && ufshcd_err_handling_should_stop(hba))
                        goto skip_err_handling;
        }

        if ((hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK)) ||
            (hba->saved_uic_err &&
             (hba->saved_uic_err != UFSHCD_UIC_PA_GENERIC_ERROR))) {
                bool pr_prdt = !!(hba->saved_err & SYSTEM_BUS_FATAL_ERROR);

                spin_unlock_irqrestore(hba->host->host_lock, flags);
                ufshcd_print_host_state(hba);
                ufshcd_print_pwr_info(hba);
                ufshcd_print_evt_hist(hba);
                ufshcd_print_tmrs(hba, hba->outstanding_tasks);
                ufshcd_print_trs(hba, hba->outstanding_reqs, pr_prdt);
                spin_lock_irqsave(hba->host->host_lock, flags);
        }

        /*
         * if host reset is required then skip clearing the pending
         * transfers forcefully because they will get cleared during
         * host reset and restore
         */
        if (hba->force_reset || ufshcd_is_link_broken(hba) ||
            ufshcd_is_saved_err_fatal(hba) ||
            ((hba->saved_err & UIC_ERROR) &&
             (hba->saved_uic_err & (UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
                                    UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))) {
                needs_reset = true;
                goto do_reset;
        }

        /*
         * If LINERESET was caught, UFS might have been put to PWM mode,
         * check if power mode restore is needed.
         */
        if (hba->saved_uic_err & UFSHCD_UIC_PA_GENERIC_ERROR) {
                hba->saved_uic_err &= ~UFSHCD_UIC_PA_GENERIC_ERROR;
                if (!hba->saved_uic_err)
                        hba->saved_err &= ~UIC_ERROR;
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                if (ufshcd_is_pwr_mode_restore_needed(hba))
                        needs_restore = true;
                spin_lock_irqsave(hba->host->host_lock, flags);
                if (!hba->saved_err && !needs_restore)
                        goto skip_err_handling;
        }

        hba->silence_err_logs = true;
        /* release lock as clear command might sleep */
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        /* Clear pending transfer requests */
        for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
                if (ufshcd_try_to_abort_task(hba, tag)) {
                        err_xfer = true;
                        goto lock_skip_pending_xfer_clear;
                }
                dev_err(hba->dev, "Aborted tag %d / CDB %#02x\n", tag,
                        hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1);
        }

        /* Clear pending task management requests */
        for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs) {
                if (ufshcd_clear_tm_cmd(hba, tag)) {
                        err_tm = true;
                        goto lock_skip_pending_xfer_clear;
                }
        }

lock_skip_pending_xfer_clear:
        /* Complete the requests that are cleared by s/w */
        ufshcd_complete_requests(hba);

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->silence_err_logs = false;
        if (err_xfer || err_tm) {
                needs_reset = true;
                goto do_reset;
        }

        /*
         * After all reqs and tasks are cleared from doorbell,
         * now it is safe to retore power mode.
         */
        if (needs_restore) {
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                /*
                 * Hold the scaling lock just in case dev cmds
                 * are sent via bsg and/or sysfs.
                 */
                down_write(&hba->clk_scaling_lock);
                hba->force_pmc = true;
                pmc_err = ufshcd_config_pwr_mode(hba, &(hba->pwr_info));
                if (pmc_err) {
                        needs_reset = true;
                        dev_err(hba->dev, "%s: Failed to restore power mode, err = %d\n",
                                        __func__, pmc_err);
                }
                hba->force_pmc = false;
                ufshcd_print_pwr_info(hba);
                up_write(&hba->clk_scaling_lock);
                spin_lock_irqsave(hba->host->host_lock, flags);
        }

do_reset:
        /* Fatal errors need reset */
        if (needs_reset) {
                int err;

                hba->force_reset = false;
                spin_unlock_irqrestore(hba->host->host_lock, flags);
                err = ufshcd_reset_and_restore(hba);
                if (err)
                        dev_err(hba->dev, "%s: reset and restore failed with err %d\n",
                                        __func__, err);
                else
                        ufshcd_recover_pm_error(hba);
                spin_lock_irqsave(hba->host->host_lock, flags);
        }

skip_err_handling:
        if (!needs_reset) {
                if (hba->ufshcd_state == UFSHCD_STATE_RESET)
                        hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
                if (hba->saved_err || hba->saved_uic_err)
                        dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x saved_uic_err 0x%x",
                            __func__, hba->saved_err, hba->saved_uic_err);
        }
        /* Exit in an operational state or dead */
        if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL &&
            hba->ufshcd_state != UFSHCD_STATE_ERROR) {
                if (--retries)
                        goto again;
                hba->ufshcd_state = UFSHCD_STATE_ERROR;
        }
        ufshcd_clear_eh_in_progress(hba);
        spin_unlock_irqrestore(hba->host->host_lock, flags);
        ufshcd_err_handling_unprepare(hba);
        up(&hba->host_sem);

        dev_info(hba->dev, "%s finished; HBA state %s\n", __func__,
                 ufshcd_state_name[hba->ufshcd_state]);
}

/**
 * ufshcd_update_uic_error - check and set fatal UIC error flags.
 * @hba: per-adapter instance
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_update_uic_error(struct ufs_hba *hba)
{
        u32 reg;
        irqreturn_t retval = IRQ_NONE;

        /* PHY layer error */
        reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
        if ((reg & UIC_PHY_ADAPTER_LAYER_ERROR) &&
            (reg & UIC_PHY_ADAPTER_LAYER_ERROR_CODE_MASK)) {
                ufshcd_update_evt_hist(hba, UFS_EVT_PA_ERR, reg);
                /*
                 * To know whether this error is fatal or not, DB timeout
                 * must be checked but this error is handled separately.
                 */
                if (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)
                        dev_dbg(hba->dev, "%s: UIC Lane error reported\n",
                                        __func__);

                /* Got a LINERESET indication. */
                if (reg & UIC_PHY_ADAPTER_LAYER_GENERIC_ERROR) {
                        struct uic_command *cmd = NULL;

                        hba->uic_error |= UFSHCD_UIC_PA_GENERIC_ERROR;
                        if (hba->uic_async_done && hba->active_uic_cmd)
                                cmd = hba->active_uic_cmd;
                        /*
                         * Ignore the LINERESET during power mode change
                         * operation via DME_SET command.
                         */
                        if (cmd && (cmd->command == UIC_CMD_DME_SET))
                                hba->uic_error &= ~UFSHCD_UIC_PA_GENERIC_ERROR;
                }
                retval |= IRQ_HANDLED;
        }

        /* PA_INIT_ERROR is fatal and needs UIC reset */
        reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
        if ((reg & UIC_DATA_LINK_LAYER_ERROR) &&
            (reg & UIC_DATA_LINK_LAYER_ERROR_CODE_MASK)) {
                ufshcd_update_evt_hist(hba, UFS_EVT_DL_ERR, reg);

                if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
                        hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
                else if (hba->dev_quirks &
                                UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
                        if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED)
                                hba->uic_error |=
                                        UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
                        else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT)
                                hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR;
                }
                retval |= IRQ_HANDLED;
        }

        /* UIC NL/TL/DME errors needs software retry */
        reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
        if ((reg & UIC_NETWORK_LAYER_ERROR) &&
            (reg & UIC_NETWORK_LAYER_ERROR_CODE_MASK)) {
                ufshcd_update_evt_hist(hba, UFS_EVT_NL_ERR, reg);
                hba->uic_error |= UFSHCD_UIC_NL_ERROR;
                retval |= IRQ_HANDLED;
        }

        reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
        if ((reg & UIC_TRANSPORT_LAYER_ERROR) &&
            (reg & UIC_TRANSPORT_LAYER_ERROR_CODE_MASK)) {
                ufshcd_update_evt_hist(hba, UFS_EVT_TL_ERR, reg);
                hba->uic_error |= UFSHCD_UIC_TL_ERROR;
                retval |= IRQ_HANDLED;
        }

        reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
        if ((reg & UIC_DME_ERROR) &&
            (reg & UIC_DME_ERROR_CODE_MASK)) {
                ufshcd_update_evt_hist(hba, UFS_EVT_DME_ERR, reg);
                hba->uic_error |= UFSHCD_UIC_DME_ERROR;
                retval |= IRQ_HANDLED;
        }

        dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
                        __func__, hba->uic_error);
        return retval;
}

/**
 * ufshcd_check_errors - Check for errors that need s/w attention
 * @hba: per-adapter instance
 * @intr_status: interrupt status generated by the controller
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba, u32 intr_status)
{
        bool queue_eh_work = false;
        irqreturn_t retval = IRQ_NONE;

        spin_lock(hba->host->host_lock);
        hba->errors |= UFSHCD_ERROR_MASK & intr_status;

        if (hba->errors & INT_FATAL_ERRORS) {
                ufshcd_update_evt_hist(hba, UFS_EVT_FATAL_ERR,
                                       hba->errors);
                queue_eh_work = true;
        }

        if (hba->errors & UIC_ERROR) {
                hba->uic_error = 0;
                retval = ufshcd_update_uic_error(hba);
                if (hba->uic_error)
                        queue_eh_work = true;
        }

        if (hba->errors & UFSHCD_UIC_HIBERN8_MASK) {
                dev_err(hba->dev,
                        "%s: Auto Hibern8 %s failed - status: 0x%08x, upmcrs: 0x%08x\n",
                        __func__, (hba->errors & UIC_HIBERNATE_ENTER) ?
                        "Enter" : "Exit",
                        hba->errors, ufshcd_get_upmcrs(hba));
                ufshcd_update_evt_hist(hba, UFS_EVT_AUTO_HIBERN8_ERR,
                                       hba->errors);
                ufshcd_set_link_broken(hba);
                queue_eh_work = true;
        }

        if (queue_eh_work) {
                /*
                 * update the transfer error masks to sticky bits, let's do this
                 * irrespective of current ufshcd_state.
                 */
                hba->saved_err |= hba->errors;
                hba->saved_uic_err |= hba->uic_error;

                /* dump controller state before resetting */
                if ((hba->saved_err &
                     (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK)) ||
                    (hba->saved_uic_err &&
                     (hba->saved_uic_err != UFSHCD_UIC_PA_GENERIC_ERROR))) {
                        dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
                                        __func__, hba->saved_err,
                                        hba->saved_uic_err);
                        ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE,
                                         "host_regs: ");
                        ufshcd_print_pwr_info(hba);
                }
                ufshcd_schedule_eh_work(hba);
                retval |= IRQ_HANDLED;
        }
        /*
         * if (!queue_eh_work) -
         * Other errors are either non-fatal where host recovers
         * itself without s/w intervention or errors that will be
         * handled by the SCSI core layer.
         */
        hba->errors = 0;
        hba->uic_error = 0;
        spin_unlock(hba->host->host_lock);
        return retval;
}

/**
 * ufshcd_tmc_handler - handle task management function completion
 * @hba: per adapter instance
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
{
        unsigned long flags, pending, issued;
        irqreturn_t ret = IRQ_NONE;
        int tag;

        spin_lock_irqsave(hba->host->host_lock, flags);
        pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
        issued = hba->outstanding_tasks & ~pending;
        for_each_set_bit(tag, &issued, hba->nutmrs) {
                struct request *req = hba->tmf_rqs[tag];
                struct completion *c = req->end_io_data;

                complete(c);
                ret = IRQ_HANDLED;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        return ret;
}

/**
 * ufshcd_sl_intr - Interrupt service routine
 * @hba: per adapter instance
 * @intr_status: contains interrupts generated by the controller
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
{
        irqreturn_t retval = IRQ_NONE;

        if (intr_status & UFSHCD_UIC_MASK)
                retval |= ufshcd_uic_cmd_compl(hba, intr_status);

        if (intr_status & UFSHCD_ERROR_MASK || hba->errors)
                retval |= ufshcd_check_errors(hba, intr_status);

        if (intr_status & UTP_TASK_REQ_COMPL)
                retval |= ufshcd_tmc_handler(hba);

        if (intr_status & UTP_TRANSFER_REQ_COMPL)
                retval |= ufshcd_transfer_req_compl(hba);

        return retval;
}

/**
 * ufshcd_intr - Main interrupt service routine
 * @irq: irq number
 * @__hba: pointer to adapter instance
 *
 * Returns
 *  IRQ_HANDLED - If interrupt is valid
 *  IRQ_NONE    - If invalid interrupt
 */
static irqreturn_t ufshcd_intr(int irq, void *__hba)
{
        u32 intr_status, enabled_intr_status = 0;
        irqreturn_t retval = IRQ_NONE;
        struct ufs_hba *hba = __hba;
        int retries = hba->nutrs;

        intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
        hba->ufs_stats.last_intr_status = intr_status;
        hba->ufs_stats.last_intr_ts = ktime_get();

        /*
         * There could be max of hba->nutrs reqs in flight and in worst case
         * if the reqs get finished 1 by 1 after the interrupt status is
         * read, make sure we handle them by checking the interrupt status
         * again in a loop until we process all of the reqs before returning.
         */
        while (intr_status && retries--) {
                enabled_intr_status =
                        intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
                ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
                if (enabled_intr_status)
                        retval |= ufshcd_sl_intr(hba, enabled_intr_status);

                intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
        }

        if (enabled_intr_status && retval == IRQ_NONE &&
            (!(enabled_intr_status & UTP_TRANSFER_REQ_COMPL) ||
             hba->outstanding_reqs) && !ufshcd_eh_in_progress(hba)) {
                dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x (0x%08x, 0x%08x)\n",
                                        __func__,
                                        intr_status,
                                        hba->ufs_stats.last_intr_status,
                                        enabled_intr_status);
                ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
        }

        return retval;
}

static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
{
        int err = 0;
        u32 mask = 1 << tag;
        unsigned long flags;

        if (!test_bit(tag, &hba->outstanding_tasks))
                goto out;

        spin_lock_irqsave(hba->host->host_lock, flags);
        ufshcd_utmrl_clear(hba, tag);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        /* poll for max. 1 sec to clear door bell register by h/w */
        err = ufshcd_wait_for_register(hba,
                        REG_UTP_TASK_REQ_DOOR_BELL,
                        mask, 0, 1000, 1000);

        dev_err(hba->dev, "Clearing task management function with tag %d %s\n",
                tag, err ? "succeeded" : "failed");

out:
        return err;
}

static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
                struct utp_task_req_desc *treq, u8 tm_function)
{
        struct request_queue *q = hba->tmf_queue;
        struct Scsi_Host *host = hba->host;
        DECLARE_COMPLETION_ONSTACK(wait);
        struct request *req;
        unsigned long flags;
        int task_tag, err;

        /*
         * blk_mq_alloc_request() is used here only to get a free tag.
         */
        req = blk_mq_alloc_request(q, REQ_OP_DRV_OUT, 0);
        if (IS_ERR(req))
                return PTR_ERR(req);

        req->end_io_data = &wait;
        ufshcd_hold(hba, false);

        spin_lock_irqsave(host->host_lock, flags);

        task_tag = req->tag;
        WARN_ONCE(task_tag < 0 || task_tag >= hba->nutmrs, "Invalid tag %d\n",
                  task_tag);
        hba->tmf_rqs[req->tag] = req;
        treq->upiu_req.req_header.dword_0 |= cpu_to_be32(task_tag);

        memcpy(hba->utmrdl_base_addr + task_tag, treq, sizeof(*treq));
        ufshcd_vops_setup_task_mgmt(hba, task_tag, tm_function);

        /* send command to the controller */
        __set_bit(task_tag, &hba->outstanding_tasks);

        ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL);
        /* Make sure that doorbell is committed immediately */
        wmb();

        spin_unlock_irqrestore(host->host_lock, flags);

        ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_SEND);

        /* wait until the task management command is completed */
        err = wait_for_completion_io_timeout(&wait,
                        msecs_to_jiffies(TM_CMD_TIMEOUT));
        if (!err) {
                ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_ERR);
                dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
                                __func__, tm_function);
                if (ufshcd_clear_tm_cmd(hba, task_tag))
                        dev_WARN(hba->dev, "%s: unable to clear tm cmd (slot %d) after timeout\n",
                                        __func__, task_tag);
                err = -ETIMEDOUT;
        } else {
                err = 0;
                memcpy(treq, hba->utmrdl_base_addr + task_tag, sizeof(*treq));

                ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_COMP);
        }

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->tmf_rqs[req->tag] = NULL;
        __clear_bit(task_tag, &hba->outstanding_tasks);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        ufshcd_release(hba);
        blk_mq_free_request(req);

        return err;
}

/**
 * ufshcd_issue_tm_cmd - issues task management commands to controller
 * @hba: per adapter instance
 * @lun_id: LUN ID to which TM command is sent
 * @task_id: task ID to which the TM command is applicable
 * @tm_function: task management function opcode
 * @tm_response: task management service response return value
 *
 * Returns non-zero value on error, zero on success.
 */
static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
                u8 tm_function, u8 *tm_response)
{
        struct utp_task_req_desc treq = { { 0 }, };
        enum utp_ocs ocs_value;
        int err;

        /* Configure task request descriptor */
        treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
        treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);

        /* Configure task request UPIU */
        treq.upiu_req.req_header.dword_0 = cpu_to_be32(lun_id << 8) |
                                  cpu_to_be32(UPIU_TRANSACTION_TASK_REQ << 24);
        treq.upiu_req.req_header.dword_1 = cpu_to_be32(tm_function << 16);

        /*
         * The host shall provide the same value for LUN field in the basic
         * header and for Input Parameter.
         */
        treq.upiu_req.input_param1 = cpu_to_be32(lun_id);
        treq.upiu_req.input_param2 = cpu_to_be32(task_id);

        err = __ufshcd_issue_tm_cmd(hba, &treq, tm_function);
        if (err == -ETIMEDOUT)
                return err;

        ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
        if (ocs_value != OCS_SUCCESS)
                dev_err(hba->dev, "%s: failed, ocs = 0x%x\n",
                                __func__, ocs_value);
        else if (tm_response)
                *tm_response = be32_to_cpu(treq.upiu_rsp.output_param1) &
                                MASK_TM_SERVICE_RESP;
        return err;
}

/**
 * ufshcd_issue_devman_upiu_cmd - API for sending "utrd" type requests
 * @hba:        per-adapter instance
 * @req_upiu:   upiu request
 * @rsp_upiu:   upiu reply
 * @desc_buff:  pointer to descriptor buffer, NULL if NA
 * @buff_len:   descriptor size, 0 if NA
 * @cmd_type:   specifies the type (NOP, Query...)
 * @desc_op:    descriptor operation
 *
 * Those type of requests uses UTP Transfer Request Descriptor - utrd.
 * Therefore, it "rides" the device management infrastructure: uses its tag and
 * tasks work queues.
 *
 * Since there is only one available tag for device management commands,
 * the caller is expected to hold the hba->dev_cmd.lock mutex.
 */
static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
                                        struct utp_upiu_req *req_upiu,
                                        struct utp_upiu_req *rsp_upiu,
                                        u8 *desc_buff, int *buff_len,
                                        enum dev_cmd_type cmd_type,
                                        enum query_opcode desc_op)
{
        DECLARE_COMPLETION_ONSTACK(wait);
        const u32 tag = hba->reserved_slot;
        struct ufshcd_lrb *lrbp;
        int err = 0;
        u8 upiu_flags;

        /* Protects use of hba->reserved_slot. */
        lockdep_assert_held(&hba->dev_cmd.lock);

        down_read(&hba->clk_scaling_lock);

        lrbp = &hba->lrb[tag];
        WARN_ON(lrbp->cmd);
        lrbp->cmd = NULL;
        lrbp->task_tag = tag;
        lrbp->lun = 0;
        lrbp->intr_cmd = true;
        ufshcd_prepare_lrbp_crypto(NULL, lrbp);
        hba->dev_cmd.type = cmd_type;

        if (hba->ufs_version <= ufshci_version(1, 1))
                lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
        else
                lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

        /* update the task tag in the request upiu */
        req_upiu->header.dword_0 |= cpu_to_be32(tag);

        ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);

        /* just copy the upiu request as it is */
        memcpy(lrbp->ucd_req_ptr, req_upiu, sizeof(*lrbp->ucd_req_ptr));
        if (desc_buff && desc_op == UPIU_QUERY_OPCODE_WRITE_DESC) {
                /* The Data Segment Area is optional depending upon the query
                 * function value. for WRITE DESCRIPTOR, the data segment
                 * follows right after the tsf.
                 */
                memcpy(lrbp->ucd_req_ptr + 1, desc_buff, *buff_len);
                *buff_len = 0;
        }

        memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));

        hba->dev_cmd.complete = &wait;

        ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);

        ufshcd_send_command(hba, tag);
        /*
         * ignore the returning value here - ufshcd_check_query_response is
         * bound to fail since dev_cmd.query and dev_cmd.type were left empty.
         * read the response directly ignoring all errors.
         */
        ufshcd_wait_for_dev_cmd(hba, lrbp, QUERY_REQ_TIMEOUT);

        /* just copy the upiu response as it is */
        memcpy(rsp_upiu, lrbp->ucd_rsp_ptr, sizeof(*rsp_upiu));
        if (desc_buff && desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
                u8 *descp = (u8 *)lrbp->ucd_rsp_ptr + sizeof(*rsp_upiu);
                u16 resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
                               MASK_QUERY_DATA_SEG_LEN;

                if (*buff_len >= resp_len) {
                        memcpy(desc_buff, descp, resp_len);
                        *buff_len = resp_len;
                } else {
                        dev_warn(hba->dev,
                                 "%s: rsp size %d is bigger than buffer size %d",
                                 __func__, resp_len, *buff_len);
                        *buff_len = 0;
                        err = -EINVAL;
                }
        }
        ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
                                    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);

        up_read(&hba->clk_scaling_lock);
        return err;
}

/**
 * ufshcd_exec_raw_upiu_cmd - API function for sending raw upiu commands
 * @hba:        per-adapter instance
 * @req_upiu:   upiu request
 * @rsp_upiu:   upiu reply - only 8 DW as we do not support scsi commands
 * @msgcode:    message code, one of UPIU Transaction Codes Initiator to Target
 * @desc_buff:  pointer to descriptor buffer, NULL if NA
 * @buff_len:   descriptor size, 0 if NA
 * @desc_op:    descriptor operation
 *
 * Supports UTP Transfer requests (nop and query), and UTP Task
 * Management requests.
 * It is up to the caller to fill the upiu conent properly, as it will
 * be copied without any further input validations.
 */
int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
                             struct utp_upiu_req *req_upiu,
                             struct utp_upiu_req *rsp_upiu,
                             int msgcode,
                             u8 *desc_buff, int *buff_len,
                             enum query_opcode desc_op)
{
        int err;
        enum dev_cmd_type cmd_type = DEV_CMD_TYPE_QUERY;
        struct utp_task_req_desc treq = { { 0 }, };
        enum utp_ocs ocs_value;
        u8 tm_f = be32_to_cpu(req_upiu->header.dword_1) >> 16 & MASK_TM_FUNC;

        switch (msgcode) {
        case UPIU_TRANSACTION_NOP_OUT:
                cmd_type = DEV_CMD_TYPE_NOP;
                fallthrough;
        case UPIU_TRANSACTION_QUERY_REQ:
                ufshcd_hold(hba, false);
                mutex_lock(&hba->dev_cmd.lock);
                err = ufshcd_issue_devman_upiu_cmd(hba, req_upiu, rsp_upiu,
                                                   desc_buff, buff_len,
                                                   cmd_type, desc_op);
                mutex_unlock(&hba->dev_cmd.lock);
                ufshcd_release(hba);

                break;
        case UPIU_TRANSACTION_TASK_REQ:
                treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
                treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);

                memcpy(&treq.upiu_req, req_upiu, sizeof(*req_upiu));

                err = __ufshcd_issue_tm_cmd(hba, &treq, tm_f);
                if (err == -ETIMEDOUT)
                        break;

                ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
                if (ocs_value != OCS_SUCCESS) {
                        dev_err(hba->dev, "%s: failed, ocs = 0x%x\n", __func__,
                                ocs_value);
                        break;
                }

                memcpy(rsp_upiu, &treq.upiu_rsp, sizeof(*rsp_upiu));

                break;
        default:
                err = -EINVAL;

                break;
        }

        return err;
}

/**
 * ufshcd_eh_device_reset_handler() - Reset a single logical unit.
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
        unsigned long flags, pending_reqs = 0, not_cleared = 0;
        struct Scsi_Host *host;
        struct ufs_hba *hba;
        u32 pos;
        int err;
        u8 resp = 0xF, lun;

        host = cmd->device->host;
        hba = shost_priv(host);

        lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
        err = ufshcd_issue_tm_cmd(hba, lun, 0, UFS_LOGICAL_RESET, &resp);
        if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
                if (!err)
                        err = resp;
                goto out;
        }

        /* clear the commands that were pending for corresponding LUN */
        spin_lock_irqsave(&hba->outstanding_lock, flags);
        for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs)
                if (hba->lrb[pos].lun == lun)
                        __set_bit(pos, &pending_reqs);
        hba->outstanding_reqs &= ~pending_reqs;
        spin_unlock_irqrestore(&hba->outstanding_lock, flags);

        if (ufshcd_clear_cmds(hba, pending_reqs) < 0) {
                spin_lock_irqsave(&hba->outstanding_lock, flags);
                not_cleared = pending_reqs &
                        ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
                hba->outstanding_reqs |= not_cleared;
                spin_unlock_irqrestore(&hba->outstanding_lock, flags);

                dev_err(hba->dev, "%s: failed to clear requests %#lx\n",
                        __func__, not_cleared);
        }
        __ufshcd_transfer_req_compl(hba, pending_reqs & ~not_cleared);

out:
        hba->req_abort_count = 0;
        ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, (u32)err);
        if (!err) {
                err = SUCCESS;
        } else {
                dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
                err = FAILED;
        }
        return err;
}

static void ufshcd_set_req_abort_skip(struct ufs_hba *hba, unsigned long bitmap)
{
        struct ufshcd_lrb *lrbp;
        int tag;

        for_each_set_bit(tag, &bitmap, hba->nutrs) {
                lrbp = &hba->lrb[tag];
                lrbp->req_abort_skip = true;
        }
}

/**
 * ufshcd_try_to_abort_task - abort a specific task
 * @hba: Pointer to adapter instance
 * @tag: Task tag/index to be aborted
 *
 * Abort the pending command in device by sending UFS_ABORT_TASK task management
 * command, and in host controller by clearing the door-bell register. There can
 * be race between controller sending the command to the device while abort is
 * issued. To avoid that, first issue UFS_QUERY_TASK to check if the command is
 * really issued and then try to abort it.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag)
{
        struct ufshcd_lrb *lrbp = &hba->lrb[tag];
        int err = 0;
        int poll_cnt;
        u8 resp = 0xF;
        u32 reg;

        for (poll_cnt = 100; poll_cnt; poll_cnt--) {
                err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
                                UFS_QUERY_TASK, &resp);
                if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) {
                        /* cmd pending in the device */
                        dev_err(hba->dev, "%s: cmd pending in the device. tag = %d\n",
                                __func__, tag);
                        break;
                } else if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
                        /*
                         * cmd not pending in the device, check if it is
                         * in transition.
                         */
                        dev_err(hba->dev, "%s: cmd at tag %d not pending in the device.\n",
                                __func__, tag);
                        reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
                        if (reg & (1 << tag)) {
                                /* sleep for max. 200us to stabilize */
                                usleep_range(100, 200);
                                continue;
                        }
                        /* command completed already */
                        dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from DB.\n",
                                __func__, tag);
                        goto out;
                } else {
                        dev_err(hba->dev,
                                "%s: no response from device. tag = %d, err %d\n",
                                __func__, tag, err);
                        if (!err)
                                err = resp; /* service response error */
                        goto out;
                }
        }

        if (!poll_cnt) {
                err = -EBUSY;
                goto out;
        }

        err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
                        UFS_ABORT_TASK, &resp);
        if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
                if (!err) {
                        err = resp; /* service response error */
                        dev_err(hba->dev, "%s: issued. tag = %d, err %d\n",
                                __func__, tag, err);
                }
                goto out;
        }

        err = ufshcd_clear_cmds(hba, 1U << tag);
        if (err)
                dev_err(hba->dev, "%s: Failed clearing cmd at tag %d, err %d\n",
                        __func__, tag, err);

out:
        return err;
}

/**
 * ufshcd_abort - scsi host template eh_abort_handler callback
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_abort(struct scsi_cmnd *cmd)
{
        struct Scsi_Host *host = cmd->device->host;
        struct ufs_hba *hba = shost_priv(host);
        int tag = scsi_cmd_to_rq(cmd)->tag;
        struct ufshcd_lrb *lrbp = &hba->lrb[tag];
        unsigned long flags;
        int err = FAILED;
        bool outstanding;
        u32 reg;

        WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);

        ufshcd_hold(hba, false);
        reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        /* If command is already aborted/completed, return FAILED. */
        if (!(test_bit(tag, &hba->outstanding_reqs))) {
                dev_err(hba->dev,
                        "%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
                        __func__, tag, hba->outstanding_reqs, reg);
                goto release;
        }

        /* Print Transfer Request of aborted task */
        dev_info(hba->dev, "%s: Device abort task at tag %d\n", __func__, tag);

        /*
         * Print detailed info about aborted request.
         * As more than one request might get aborted at the same time,
         * print full information only for the first aborted request in order
         * to reduce repeated printouts. For other aborted requests only print
         * basic details.
         */
        scsi_print_command(cmd);
        if (!hba->req_abort_count) {
                ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, tag);
                ufshcd_print_evt_hist(hba);
                ufshcd_print_host_state(hba);
                ufshcd_print_pwr_info(hba);
                ufshcd_print_trs(hba, 1 << tag, true);
        } else {
                ufshcd_print_trs(hba, 1 << tag, false);
        }
        hba->req_abort_count++;

        if (!(reg & (1 << tag))) {
                dev_err(hba->dev,
                "%s: cmd was completed, but without a notifying intr, tag = %d",
                __func__, tag);
                __ufshcd_transfer_req_compl(hba, 1UL << tag);
                goto release;
        }

        /*
         * Task abort to the device W-LUN is illegal. When this command
         * will fail, due to spec violation, scsi err handling next step
         * will be to send LU reset which, again, is a spec violation.
         * To avoid these unnecessary/illegal steps, first we clean up
         * the lrb taken by this cmd and re-set it in outstanding_reqs,
         * then queue the eh_work and bail.
         */
        if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN) {
                ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, lrbp->lun);

                spin_lock_irqsave(host->host_lock, flags);
                hba->force_reset = true;
                ufshcd_schedule_eh_work(hba);
                spin_unlock_irqrestore(host->host_lock, flags);
                goto release;
        }

        /* Skip task abort in case previous aborts failed and report failure */
        if (lrbp->req_abort_skip) {
                dev_err(hba->dev, "%s: skipping abort\n", __func__);
                ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
                goto release;
        }

        err = ufshcd_try_to_abort_task(hba, tag);
        if (err) {
                dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
                ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
                err = FAILED;
                goto release;
        }

        /*
         * Clear the corresponding bit from outstanding_reqs since the command
         * has been aborted successfully.
         */
        spin_lock_irqsave(&hba->outstanding_lock, flags);
        outstanding = __test_and_clear_bit(tag, &hba->outstanding_reqs);
        spin_unlock_irqrestore(&hba->outstanding_lock, flags);

        if (outstanding)
                ufshcd_release_scsi_cmd(hba, lrbp);

        err = SUCCESS;

release:
        /* Matches the ufshcd_hold() call at the start of this function. */
        ufshcd_release(hba);
        return err;
}

/**
 * ufshcd_host_reset_and_restore - reset and restore host controller
 * @hba: per-adapter instance
 *
 * Note that host controller reset may issue DME_RESET to
 * local and remote (device) Uni-Pro stack and the attributes
 * are reset to default state.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
{
        int err;

        /*
         * Stop the host controller and complete the requests
         * cleared by h/w
         */
        ufshpb_toggle_state(hba, HPB_PRESENT, HPB_RESET);
        ufshcd_hba_stop(hba);
        hba->silence_err_logs = true;
        ufshcd_complete_requests(hba);
        hba->silence_err_logs = false;

        /* scale up clocks to max frequency before full reinitialization */
        ufshcd_set_clk_freq(hba, true);

        err = ufshcd_hba_enable(hba);

        /* Establish the link again and restore the device */
        if (!err)
                err = ufshcd_probe_hba(hba, false);

        if (err)
                dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);
        ufshcd_update_evt_hist(hba, UFS_EVT_HOST_RESET, (u32)err);
        return err;
}

/**
 * ufshcd_reset_and_restore - reset and re-initialize host/device
 * @hba: per-adapter instance
 *
 * Reset and recover device, host and re-establish link. This
 * is helpful to recover the communication in fatal error conditions.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_reset_and_restore(struct ufs_hba *hba)
{
        u32 saved_err = 0;
        u32 saved_uic_err = 0;
        int err = 0;
        unsigned long flags;
        int retries = MAX_HOST_RESET_RETRIES;

        spin_lock_irqsave(hba->host->host_lock, flags);
        do {
                /*
                 * This is a fresh start, cache and clear saved error first,
                 * in case new error generated during reset and restore.
                 */
                saved_err |= hba->saved_err;
                saved_uic_err |= hba->saved_uic_err;
                hba->saved_err = 0;
                hba->saved_uic_err = 0;
                hba->force_reset = false;
                hba->ufshcd_state = UFSHCD_STATE_RESET;
                spin_unlock_irqrestore(hba->host->host_lock, flags);

                /* Reset the attached device */
                ufshcd_device_reset(hba);

                err = ufshcd_host_reset_and_restore(hba);

                spin_lock_irqsave(hba->host->host_lock, flags);
                if (err)
                        continue;
                /* Do not exit unless operational or dead */
                if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL &&
                    hba->ufshcd_state != UFSHCD_STATE_ERROR &&
                    hba->ufshcd_state != UFSHCD_STATE_EH_SCHEDULED_NON_FATAL)
                        err = -EAGAIN;
        } while (err && --retries);

        /*
         * Inform scsi mid-layer that we did reset and allow to handle
         * Unit Attention properly.
         */
        scsi_report_bus_reset(hba->host, 0);
        if (err) {
                hba->ufshcd_state = UFSHCD_STATE_ERROR;
                hba->saved_err |= saved_err;
                hba->saved_uic_err |= saved_uic_err;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        return err;
}

/**
 * ufshcd_eh_host_reset_handler - host reset handler registered to scsi layer
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
        int err = SUCCESS;
        unsigned long flags;
        struct ufs_hba *hba;

        hba = shost_priv(cmd->device->host);

        spin_lock_irqsave(hba->host->host_lock, flags);
        hba->force_reset = true;
        ufshcd_schedule_eh_work(hba);
        dev_err(hba->dev, "%s: reset in progress - 1\n", __func__);
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        flush_work(&hba->eh_work);

        spin_lock_irqsave(hba->host->host_lock, flags);
        if (hba->ufshcd_state == UFSHCD_STATE_ERROR)
                err = FAILED;
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        return err;
}

/**
 * ufshcd_get_max_icc_level - calculate the ICC level
 * @sup_curr_uA: max. current supported by the regulator
 * @start_scan: row at the desc table to start scan from
 * @buff: power descriptor buffer
 *
 * Returns calculated max ICC level for specific regulator
 */
static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan,
                                    const char *buff)
{
        int i;
        int curr_uA;
        u16 data;
        u16 unit;

        for (i = start_scan; i >= 0; i--) {
                data = get_unaligned_be16(&buff[2 * i]);
                unit = (data & ATTR_ICC_LVL_UNIT_MASK) >>
                                                ATTR_ICC_LVL_UNIT_OFFSET;
                curr_uA = data & ATTR_ICC_LVL_VALUE_MASK;
                switch (unit) {
                case UFSHCD_NANO_AMP:
                        curr_uA = curr_uA / 1000;
                        break;
                case UFSHCD_MILI_AMP:
                        curr_uA = curr_uA * 1000;
                        break;
                case UFSHCD_AMP:
                        curr_uA = curr_uA * 1000 * 1000;
                        break;
                case UFSHCD_MICRO_AMP:
                default:
                        break;
                }
                if (sup_curr_uA >= curr_uA)
                        break;
        }
        if (i < 0) {
                i = 0;
                pr_err("%s: Couldn't find valid icc_level = %d", __func__, i);
        }

        return (u32)i;
}

/**
 * ufshcd_find_max_sup_active_icc_level - calculate the max ICC level
 * In case regulators are not initialized we'll return 0
 * @hba: per-adapter instance
 * @desc_buf: power descriptor buffer to extract ICC levels from.
 * @len: length of desc_buff
 *
 * Returns calculated ICC level
 */
static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
                                                const u8 *desc_buf, int len)
{
        u32 icc_level = 0;

        if (!hba->vreg_info.vcc || !hba->vreg_info.vccq ||
                                                !hba->vreg_info.vccq2) {
                /*
                 * Using dev_dbg to avoid messages during runtime PM to avoid
                 * never-ending cycles of messages written back to storage by
                 * user space causing runtime resume, causing more messages and
                 * so on.
                 */
                dev_dbg(hba->dev,
                        "%s: Regulator capability was not set, actvIccLevel=%d",
                                                        __func__, icc_level);
                goto out;
        }

        if (hba->vreg_info.vcc->max_uA)
                icc_level = ufshcd_get_max_icc_level(
                                hba->vreg_info.vcc->max_uA,
                                POWER_DESC_MAX_ACTV_ICC_LVLS - 1,
                                &desc_buf[PWR_DESC_ACTIVE_LVLS_VCC_0]);

        if (hba->vreg_info.vccq->max_uA)
                icc_level = ufshcd_get_max_icc_level(
                                hba->vreg_info.vccq->max_uA,
                                icc_level,
                                &desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ_0]);

        if (hba->vreg_info.vccq2->max_uA)
                icc_level = ufshcd_get_max_icc_level(
                                hba->vreg_info.vccq2->max_uA,
                                icc_level,
                                &desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ2_0]);
out:
        return icc_level;
}

static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba)
{
        int ret;
        int buff_len = hba->desc_size[QUERY_DESC_IDN_POWER];
        u8 *desc_buf;
        u32 icc_level;

        desc_buf = kmalloc(buff_len, GFP_KERNEL);
        if (!desc_buf)
                return;

        ret = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_POWER, 0, 0,
                                     desc_buf, buff_len);
        if (ret) {
                dev_err(hba->dev,
                        "%s: Failed reading power descriptor.len = %d ret = %d",
                        __func__, buff_len, ret);
                goto out;
        }

        icc_level = ufshcd_find_max_sup_active_icc_level(hba, desc_buf,
                                                         buff_len);
        dev_dbg(hba->dev, "%s: setting icc_level 0x%x", __func__, icc_level);

        ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
                QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0, &icc_level);

        if (ret)
                dev_err(hba->dev,
                        "%s: Failed configuring bActiveICCLevel = %d ret = %d",
                        __func__, icc_level, ret);

out:
        kfree(desc_buf);
}

static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
{
        scsi_autopm_get_device(sdev);
        blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev);
        if (sdev->rpm_autosuspend)
                pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev,
                                                 RPM_AUTOSUSPEND_DELAY_MS);
        scsi_autopm_put_device(sdev);
}

/**
 * ufshcd_scsi_add_wlus - Adds required W-LUs
 * @hba: per-adapter instance
 *
 * UFS device specification requires the UFS devices to support 4 well known
 * logical units:
 *      "REPORT_LUNS" (address: 01h)
 *      "UFS Device" (address: 50h)
 *      "RPMB" (address: 44h)
 *      "BOOT" (address: 30h)
 * UFS device's power management needs to be controlled by "POWER CONDITION"
 * field of SSU (START STOP UNIT) command. But this "power condition" field
 * will take effect only when its sent to "UFS device" well known logical unit
 * hence we require the scsi_device instance to represent this logical unit in
 * order for the UFS host driver to send the SSU command for power management.
 *
 * We also require the scsi_device instance for "RPMB" (Replay Protected Memory
 * Block) LU so user space process can control this LU. User space may also
 * want to have access to BOOT LU.
 *
 * This function adds scsi device instances for each of all well known LUs
 * (except "REPORT LUNS" LU).
 *
 * Returns zero on success (all required W-LUs are added successfully),
 * non-zero error value on failure (if failed to add any of the required W-LU).
 */
static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
{
        int ret = 0;
        struct scsi_device *sdev_boot, *sdev_rpmb;

        hba->ufs_device_wlun = __scsi_add_device(hba->host, 0, 0,
                ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN), NULL);
        if (IS_ERR(hba->ufs_device_wlun)) {
                ret = PTR_ERR(hba->ufs_device_wlun);
                hba->ufs_device_wlun = NULL;
                goto out;
        }
        scsi_device_put(hba->ufs_device_wlun);

        sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
                ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN), NULL);
        if (IS_ERR(sdev_rpmb)) {
                ret = PTR_ERR(sdev_rpmb);
                goto remove_ufs_device_wlun;
        }
        ufshcd_blk_pm_runtime_init(sdev_rpmb);
        scsi_device_put(sdev_rpmb);

        sdev_boot = __scsi_add_device(hba->host, 0, 0,
                ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
        if (IS_ERR(sdev_boot)) {
                dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__);
        } else {
                ufshcd_blk_pm_runtime_init(sdev_boot);
                scsi_device_put(sdev_boot);
        }
        goto out;

remove_ufs_device_wlun:
        scsi_remove_device(hba->ufs_device_wlun);
out:
        return ret;
}

static void ufshcd_wb_probe(struct ufs_hba *hba, const u8 *desc_buf)
{
        struct ufs_dev_info *dev_info = &hba->dev_info;
        u8 lun;
        u32 d_lu_wb_buf_alloc;
        u32 ext_ufs_feature;

        if (!ufshcd_is_wb_allowed(hba))
                return;

        /*
         * Probe WB only for UFS-2.2 and UFS-3.1 (and later) devices or
         * UFS devices with quirk UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES
         * enabled
         */
        if (!(dev_info->wspecversion >= 0x310 ||
              dev_info->wspecversion == 0x220 ||
             (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES)))
                goto wb_disabled;

        if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
            DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
                goto wb_disabled;

        ext_ufs_feature = get_unaligned_be32(desc_buf +
                                        DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);

        if (!(ext_ufs_feature & UFS_DEV_WRITE_BOOSTER_SUP))
                goto wb_disabled;

        /*
         * WB may be supported but not configured while provisioning. The spec
         * says, in dedicated wb buffer mode, a max of 1 lun would have wb
         * buffer configured.
         */
        dev_info->wb_buffer_type = desc_buf[DEVICE_DESC_PARAM_WB_TYPE];

        dev_info->b_presrv_uspc_en =
                desc_buf[DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN];

        if (dev_info->wb_buffer_type == WB_BUF_MODE_SHARED) {
                if (!get_unaligned_be32(desc_buf +
                                   DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS))
                        goto wb_disabled;
        } else {
                for (lun = 0; lun < UFS_UPIU_MAX_WB_LUN_ID; lun++) {
                        d_lu_wb_buf_alloc = 0;
                        ufshcd_read_unit_desc_param(hba,
                                        lun,
                                        UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS,
                                        (u8 *)&d_lu_wb_buf_alloc,
                                        sizeof(d_lu_wb_buf_alloc));
                        if (d_lu_wb_buf_alloc) {
                                dev_info->wb_dedicated_lu = lun;
                                break;
                        }
                }

                if (!d_lu_wb_buf_alloc)
                        goto wb_disabled;
        }

        if (!ufshcd_is_wb_buf_lifetime_available(hba))
                goto wb_disabled;

        return;

wb_disabled:
        hba->caps &= ~UFSHCD_CAP_WB_EN;
}

static void ufshcd_temp_notif_probe(struct ufs_hba *hba, const u8 *desc_buf)
{
        struct ufs_dev_info *dev_info = &hba->dev_info;
        u32 ext_ufs_feature;
        u8 mask = 0;

        if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
                return;

        ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);

        if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
                mask |= MASK_EE_TOO_LOW_TEMP;

        if (ext_ufs_feature & UFS_DEV_HIGH_TEMP_NOTIF)
                mask |= MASK_EE_TOO_HIGH_TEMP;

        if (mask) {
                ufshcd_enable_ee(hba, mask);
                ufs_hwmon_probe(hba, mask);
        }
}

void ufshcd_fixup_dev_quirks(struct ufs_hba *hba,
                             const struct ufs_dev_quirk *fixups)
{
        const struct ufs_dev_quirk *f;
        struct ufs_dev_info *dev_info = &hba->dev_info;

        if (!fixups)
                return;

        for (f = fixups; f->quirk; f++) {
                if ((f->wmanufacturerid == dev_info->wmanufacturerid ||
                     f->wmanufacturerid == UFS_ANY_VENDOR) &&
                     ((dev_info->model &&
                       STR_PRFX_EQUAL(f->model, dev_info->model)) ||
                      !strcmp(f->model, UFS_ANY_MODEL)))
                        hba->dev_quirks |= f->quirk;
        }
}
EXPORT_SYMBOL_GPL(ufshcd_fixup_dev_quirks);

static void ufs_fixup_device_setup(struct ufs_hba *hba)
{
        /* fix by general quirk table */
        ufshcd_fixup_dev_quirks(hba, ufs_fixups);

        /* allow vendors to fix quirks */
        ufshcd_vops_fixup_dev_quirks(hba);
}

static int ufs_get_device_desc(struct ufs_hba *hba)
{
        int err;
        u8 model_index;
        u8 b_ufs_feature_sup;
        u8 *desc_buf;
        struct ufs_dev_info *dev_info = &hba->dev_info;

        desc_buf = kmalloc(QUERY_DESC_MAX_SIZE, GFP_KERNEL);
        if (!desc_buf) {
                err = -ENOMEM;
                goto out;
        }

        err = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_DEVICE, 0, 0, desc_buf,
                                     hba->desc_size[QUERY_DESC_IDN_DEVICE]);
        if (err) {
                dev_err(hba->dev, "%s: Failed reading Device Desc. err = %d\n",
                        __func__, err);
                goto out;
        }

        /*
         * getting vendor (manufacturerID) and Bank Index in big endian
         * format
         */
        dev_info->wmanufacturerid = desc_buf[DEVICE_DESC_PARAM_MANF_ID] << 8 |
                                     desc_buf[DEVICE_DESC_PARAM_MANF_ID + 1];

        /* getting Specification Version in big endian format */
        dev_info->wspecversion = desc_buf[DEVICE_DESC_PARAM_SPEC_VER] << 8 |
                                      desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
        b_ufs_feature_sup = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT];

        model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];

        if (dev_info->wspecversion >= UFS_DEV_HPB_SUPPORT_VERSION &&
            (b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT)) {
                bool hpb_en = false;

                ufshpb_get_dev_info(hba, desc_buf);

                if (!ufshpb_is_legacy(hba))
                        err = ufshcd_query_flag_retry(hba,
                                                      UPIU_QUERY_OPCODE_READ_FLAG,
                                                      QUERY_FLAG_IDN_HPB_EN, 0,
                                                      &hpb_en);

                if (ufshpb_is_legacy(hba) || (!err && hpb_en))
                        dev_info->hpb_enabled = true;
        }

        err = ufshcd_read_string_desc(hba, model_index,
                                      &dev_info->model, SD_ASCII_STD);
        if (err < 0) {
                dev_err(hba->dev, "%s: Failed reading Product Name. err = %d\n",
                        __func__, err);
                goto out;
        }

        hba->luns_avail = desc_buf[DEVICE_DESC_PARAM_NUM_LU] +
                desc_buf[DEVICE_DESC_PARAM_NUM_WLU];

        ufs_fixup_device_setup(hba);

        ufshcd_wb_probe(hba, desc_buf);

        ufshcd_temp_notif_probe(hba, desc_buf);

        /*
         * ufshcd_read_string_desc returns size of the string
         * reset the error value
         */
        err = 0;

out:
        kfree(desc_buf);
        return err;
}

static void ufs_put_device_desc(struct ufs_hba *hba)
{
        struct ufs_dev_info *dev_info = &hba->dev_info;

        kfree(dev_info->model);
        dev_info->model = NULL;
}

/**
 * ufshcd_tune_pa_tactivate - Tunes PA_TActivate of local UniPro
 * @hba: per-adapter instance
 *
 * PA_TActivate parameter can be tuned manually if UniPro version is less than
 * 1.61. PA_TActivate needs to be greater than or equal to peerM-PHY's
 * RX_MIN_ACTIVATETIME_CAPABILITY attribute. This optimal value can help reduce
 * the hibern8 exit latency.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_tune_pa_tactivate(struct ufs_hba *hba)
{
        int ret = 0;
        u32 peer_rx_min_activatetime = 0, tuned_pa_tactivate;

        ret = ufshcd_dme_peer_get(hba,
                                  UIC_ARG_MIB_SEL(
                                        RX_MIN_ACTIVATETIME_CAPABILITY,
                                        UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
                                  &peer_rx_min_activatetime);
        if (ret)
                goto out;

        /* make sure proper unit conversion is applied */
        tuned_pa_tactivate =
                ((peer_rx_min_activatetime * RX_MIN_ACTIVATETIME_UNIT_US)
                 / PA_TACTIVATE_TIME_UNIT_US);
        ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
                             tuned_pa_tactivate);

out:
        return ret;
}

/**
 * ufshcd_tune_pa_hibern8time - Tunes PA_Hibern8Time of local UniPro
 * @hba: per-adapter instance
 *
 * PA_Hibern8Time parameter can be tuned manually if UniPro version is less than
 * 1.61. PA_Hibern8Time needs to be maximum of local M-PHY's
 * TX_HIBERN8TIME_CAPABILITY & peer M-PHY's RX_HIBERN8TIME_CAPABILITY.
 * This optimal value can help reduce the hibern8 exit latency.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_tune_pa_hibern8time(struct ufs_hba *hba)
{
        int ret = 0;
        u32 local_tx_hibern8_time_cap = 0, peer_rx_hibern8_time_cap = 0;
        u32 max_hibern8_time, tuned_pa_hibern8time;

        ret = ufshcd_dme_get(hba,
                             UIC_ARG_MIB_SEL(TX_HIBERN8TIME_CAPABILITY,
                                        UIC_ARG_MPHY_TX_GEN_SEL_INDEX(0)),
                                  &local_tx_hibern8_time_cap);
        if (ret)
                goto out;

        ret = ufshcd_dme_peer_get(hba,
                                  UIC_ARG_MIB_SEL(RX_HIBERN8TIME_CAPABILITY,
                                        UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
                                  &peer_rx_hibern8_time_cap);
        if (ret)
                goto out;

        max_hibern8_time = max(local_tx_hibern8_time_cap,
                               peer_rx_hibern8_time_cap);
        /* make sure proper unit conversion is applied */
        tuned_pa_hibern8time = ((max_hibern8_time * HIBERN8TIME_UNIT_US)
                                / PA_HIBERN8_TIME_UNIT_US);
        ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HIBERN8TIME),
                             tuned_pa_hibern8time);
out:
        return ret;
}

/**
 * ufshcd_quirk_tune_host_pa_tactivate - Ensures that host PA_TACTIVATE is
 * less than device PA_TACTIVATE time.
 * @hba: per-adapter instance
 *
 * Some UFS devices require host PA_TACTIVATE to be lower than device
 * PA_TACTIVATE, we need to enable UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE quirk
 * for such devices.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_quirk_tune_host_pa_tactivate(struct ufs_hba *hba)
{
        int ret = 0;
        u32 granularity, peer_granularity;
        u32 pa_tactivate, peer_pa_tactivate;
        u32 pa_tactivate_us, peer_pa_tactivate_us;
        static const u8 gran_to_us_table[] = {1, 4, 8, 16, 32, 100};

        ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
                                  &granularity);
        if (ret)
                goto out;

        ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
                                  &peer_granularity);
        if (ret)
                goto out;

        if ((granularity < PA_GRANULARITY_MIN_VAL) ||
            (granularity > PA_GRANULARITY_MAX_VAL)) {
                dev_err(hba->dev, "%s: invalid host PA_GRANULARITY %d",
                        __func__, granularity);
                return -EINVAL;
        }

        if ((peer_granularity < PA_GRANULARITY_MIN_VAL) ||
            (peer_granularity > PA_GRANULARITY_MAX_VAL)) {
                dev_err(hba->dev, "%s: invalid device PA_GRANULARITY %d",
                        __func__, peer_granularity);
                return -EINVAL;
        }

        ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
        if (ret)
                goto out;

        ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE),
                                  &peer_pa_tactivate);
        if (ret)
                goto out;

        pa_tactivate_us = pa_tactivate * gran_to_us_table[granularity - 1];
        peer_pa_tactivate_us = peer_pa_tactivate *
                             gran_to_us_table[peer_granularity - 1];

        if (pa_tactivate_us >= peer_pa_tactivate_us) {
                u32 new_peer_pa_tactivate;

                new_peer_pa_tactivate = pa_tactivate_us /
                                      gran_to_us_table[peer_granularity - 1];
                new_peer_pa_tactivate++;
                ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
                                          new_peer_pa_tactivate);
        }

out:
        return ret;
}

static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
{
        if (ufshcd_is_unipro_pa_params_tuning_req(hba)) {
                ufshcd_tune_pa_tactivate(hba);
                ufshcd_tune_pa_hibern8time(hba);
        }

        ufshcd_vops_apply_dev_quirks(hba);

        if (hba->dev_quirks & UFS_DEVICE_QUIRK_PA_TACTIVATE)
                /* set 1ms timeout for PA_TACTIVATE */
                ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 10);

        if (hba->dev_quirks & UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE)
                ufshcd_quirk_tune_host_pa_tactivate(hba);
}

static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)
{
        hba->ufs_stats.hibern8_exit_cnt = 0;
        hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
        hba->req_abort_count = 0;
}

static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
{
        int err;
        size_t buff_len;
        u8 *desc_buf;

        buff_len = hba->desc_size[QUERY_DESC_IDN_GEOMETRY];
        desc_buf = kmalloc(buff_len, GFP_KERNEL);
        if (!desc_buf) {
                err = -ENOMEM;
                goto out;
        }

        err = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_GEOMETRY, 0, 0,
                                     desc_buf, buff_len);
        if (err) {
                dev_err(hba->dev, "%s: Failed reading Geometry Desc. err = %d\n",
                                __func__, err);
                goto out;
        }

        if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 1)
                hba->dev_info.max_lu_supported = 32;
        else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
                hba->dev_info.max_lu_supported = 8;

        if (hba->desc_size[QUERY_DESC_IDN_GEOMETRY] >=
                GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS)
                ufshpb_get_geo_info(hba, desc_buf);

out:
        kfree(desc_buf);
        return err;
}

struct ufs_ref_clk {
        unsigned long freq_hz;
        enum ufs_ref_clk_freq val;
};

static const struct ufs_ref_clk ufs_ref_clk_freqs[] = {
        {19200000, REF_CLK_FREQ_19_2_MHZ},
        {26000000, REF_CLK_FREQ_26_MHZ},
        {38400000, REF_CLK_FREQ_38_4_MHZ},
        {52000000, REF_CLK_FREQ_52_MHZ},
        {0, REF_CLK_FREQ_INVAL},
};

static enum ufs_ref_clk_freq
ufs_get_bref_clk_from_hz(unsigned long freq)
{
        int i;

        for (i = 0; ufs_ref_clk_freqs[i].freq_hz; i++)
                if (ufs_ref_clk_freqs[i].freq_hz == freq)
                        return ufs_ref_clk_freqs[i].val;

        return REF_CLK_FREQ_INVAL;
}

void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba, struct clk *refclk)
{
        unsigned long freq;

        freq = clk_get_rate(refclk);

        hba->dev_ref_clk_freq =
                ufs_get_bref_clk_from_hz(freq);

        if (hba->dev_ref_clk_freq == REF_CLK_FREQ_INVAL)
                dev_err(hba->dev,
                "invalid ref_clk setting = %ld\n", freq);
}

static int ufshcd_set_dev_ref_clk(struct ufs_hba *hba)
{
        int err;
        u32 ref_clk;
        u32 freq = hba->dev_ref_clk_freq;

        err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
                        QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &ref_clk);

        if (err) {
                dev_err(hba->dev, "failed reading bRefClkFreq. err = %d\n",
                        err);
                goto out;
        }

        if (ref_clk == freq)
                goto out; /* nothing to update */

        err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
                        QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &freq);

        if (err) {
                dev_err(hba->dev, "bRefClkFreq setting to %lu Hz failed\n",
                        ufs_ref_clk_freqs[freq].freq_hz);
                goto out;
        }

        dev_dbg(hba->dev, "bRefClkFreq setting to %lu Hz succeeded\n",
                        ufs_ref_clk_freqs[freq].freq_hz);

out:
        return err;
}

static int ufshcd_device_params_init(struct ufs_hba *hba)
{
        bool flag;
        int ret, i;

         /* Init device descriptor sizes */
        for (i = 0; i < QUERY_DESC_IDN_MAX; i++)
                hba->desc_size[i] = QUERY_DESC_MAX_SIZE;

        /* Init UFS geometry descriptor related parameters */
        ret = ufshcd_device_geo_params_init(hba);
        if (ret)
                goto out;

        /* Check and apply UFS device quirks */
        ret = ufs_get_device_desc(hba);
        if (ret) {
                dev_err(hba->dev, "%s: Failed getting device info. err = %d\n",
                        __func__, ret);
                goto out;
        }

        ufshcd_get_ref_clk_gating_wait(hba);

        if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
                        QUERY_FLAG_IDN_PWR_ON_WPE, 0, &flag))
                hba->dev_info.f_power_on_wp_en = flag;

        /* Probe maximum power mode co-supported by both UFS host and device */
        if (ufshcd_get_max_pwr_mode(hba))
                dev_err(hba->dev,
                        "%s: Failed getting max supported power mode\n",
                        __func__);
out:
        return ret;
}

/**
 * ufshcd_add_lus - probe and add UFS logical units
 * @hba: per-adapter instance
 */
static int ufshcd_add_lus(struct ufs_hba *hba)
{
        int ret;

        /* Add required well known logical units to scsi mid layer */
        ret = ufshcd_scsi_add_wlus(hba);
        if (ret)
                goto out;

        /* Initialize devfreq after UFS device is detected */
        if (ufshcd_is_clkscaling_supported(hba)) {
                memcpy(&hba->clk_scaling.saved_pwr_info.info,
                        &hba->pwr_info,
                        sizeof(struct ufs_pa_layer_attr));
                hba->clk_scaling.saved_pwr_info.is_valid = true;
                hba->clk_scaling.is_allowed = true;

                ret = ufshcd_devfreq_init(hba);
                if (ret)
                        goto out;

                hba->clk_scaling.is_enabled = true;
                ufshcd_init_clk_scaling_sysfs(hba);
        }

        ufs_bsg_probe(hba);
        ufshpb_init(hba);
        scsi_scan_host(hba->host);
        pm_runtime_put_sync(hba->dev);

out:
        return ret;
}

/**
 * ufshcd_probe_hba - probe hba to detect device and initialize it
 * @hba: per-adapter instance
 * @init_dev_params: whether or not to call ufshcd_device_params_init().
 *
 * Execute link-startup and verify device initialization
 */
static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
{
        int ret;
        unsigned long flags;
        ktime_t start = ktime_get();

        hba->ufshcd_state = UFSHCD_STATE_RESET;

        ret = ufshcd_link_startup(hba);
        if (ret)
                goto out;

        if (hba->quirks & UFSHCD_QUIRK_SKIP_PH_CONFIGURATION)
                goto out;

        /* Debug counters initialization */
        ufshcd_clear_dbg_ufs_stats(hba);

        /* UniPro link is active now */
        ufshcd_set_link_active(hba);

        /* Verify device initialization by sending NOP OUT UPIU */
        ret = ufshcd_verify_dev_init(hba);
        if (ret)
                goto out;

        /* Initiate UFS initialization, and waiting until completion */
        ret = ufshcd_complete_dev_init(hba);
        if (ret)
                goto out;

        /*
         * Initialize UFS device parameters used by driver, these
         * parameters are associated with UFS descriptors.
         */
        if (init_dev_params) {
                ret = ufshcd_device_params_init(hba);
                if (ret)
                        goto out;
        }

        ufshcd_tune_unipro_params(hba);

        /* UFS device is also active now */
        ufshcd_set_ufs_dev_active(hba);
        ufshcd_force_reset_auto_bkops(hba);

        /* Gear up to HS gear if supported */
        if (hba->max_pwr_info.is_valid) {
                /*
                 * Set the right value to bRefClkFreq before attempting to
                 * switch to HS gears.
                 */
                if (hba->dev_ref_clk_freq != REF_CLK_FREQ_INVAL)
                        ufshcd_set_dev_ref_clk(hba);
                ret = ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
                if (ret) {
                        dev_err(hba->dev, "%s: Failed setting power mode, err = %d\n",
                                        __func__, ret);
                        goto out;
                }
                ufshcd_print_pwr_info(hba);
        }

        /*
         * bActiveICCLevel is volatile for UFS device (as per latest v2.1 spec)
         * and for removable UFS card as well, hence always set the parameter.
         * Note: Error handler may issue the device reset hence resetting
         * bActiveICCLevel as well so it is always safe to set this here.
         */
        ufshcd_set_active_icc_lvl(hba);

        ufshcd_wb_config(hba);
        if (hba->ee_usr_mask)
                ufshcd_write_ee_control(hba);
        /* Enable Auto-Hibernate if configured */
        ufshcd_auto_hibern8_enable(hba);

        ufshpb_toggle_state(hba, HPB_RESET, HPB_PRESENT);
out:
        spin_lock_irqsave(hba->host->host_lock, flags);
        if (ret)
                hba->ufshcd_state = UFSHCD_STATE_ERROR;
        else if (hba->ufshcd_state == UFSHCD_STATE_RESET)
                hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        trace_ufshcd_init(dev_name(hba->dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        return ret;
}

/**
 * ufshcd_async_scan - asynchronous execution for probing hba
 * @data: data pointer to pass to this function
 * @cookie: cookie data
 */
static void ufshcd_async_scan(void *data, async_cookie_t cookie)
{
        struct ufs_hba *hba = (struct ufs_hba *)data;
        int ret;

        down(&hba->host_sem);
        /* Initialize hba, detect and initialize UFS device */
        ret = ufshcd_probe_hba(hba, true);
        up(&hba->host_sem);
        if (ret)
                goto out;

        /* Probe and add UFS logical units  */
        ret = ufshcd_add_lus(hba);
out:
        /*
         * If we failed to initialize the device or the device is not
         * present, turn off the power/clocks etc.
         */
        if (ret) {
                pm_runtime_put_sync(hba->dev);
                ufshcd_hba_exit(hba);
        }
}

static const struct attribute_group *ufshcd_driver_groups[] = {
        &ufs_sysfs_unit_descriptor_group,
        &ufs_sysfs_lun_attributes_group,
#ifdef CONFIG_SCSI_UFS_HPB
        &ufs_sysfs_hpb_stat_group,
        &ufs_sysfs_hpb_param_group,
#endif
        NULL,
};

static struct ufs_hba_variant_params ufs_hba_vps = {
        .hba_enable_delay_us            = 1000,
        .wb_flush_threshold             = UFS_WB_BUF_REMAIN_PERCENT(40),
        .devfreq_profile.polling_ms     = 100,
        .devfreq_profile.target         = ufshcd_devfreq_target,
        .devfreq_profile.get_dev_status = ufshcd_devfreq_get_dev_status,
        .ondemand_data.upthreshold      = 70,
        .ondemand_data.downdifferential = 5,
};

static struct scsi_host_template ufshcd_driver_template = {
        .module                 = THIS_MODULE,
        .name                   = UFSHCD,
        .proc_name              = UFSHCD,
        .map_queues             = ufshcd_map_queues,
        .queuecommand           = ufshcd_queuecommand,
        .mq_poll                = ufshcd_poll,
        .slave_alloc            = ufshcd_slave_alloc,
        .slave_configure        = ufshcd_slave_configure,
        .slave_destroy          = ufshcd_slave_destroy,
        .change_queue_depth     = ufshcd_change_queue_depth,
        .eh_abort_handler       = ufshcd_abort,
        .eh_device_reset_handler = ufshcd_eh_device_reset_handler,
        .eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
        .this_id                = -1,
        .sg_tablesize           = SG_ALL,
        .cmd_per_lun            = UFSHCD_CMD_PER_LUN,
        .can_queue              = UFSHCD_CAN_QUEUE,
        .max_segment_size       = PRDT_DATA_BYTE_COUNT_MAX,
        .max_host_blocked       = 1,
        .track_queue_depth      = 1,
        .sdev_groups            = ufshcd_driver_groups,
        .dma_boundary           = PAGE_SIZE - 1,
        .rpm_autosuspend_delay  = RPM_AUTOSUSPEND_DELAY_MS,
};

static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
                                   int ua)
{
        int ret;

        if (!vreg)
                return 0;

        /*
         * "set_load" operation shall be required on those regulators
         * which specifically configured current limitation. Otherwise
         * zero max_uA may cause unexpected behavior when regulator is
         * enabled or set as high power mode.
         */
        if (!vreg->max_uA)
                return 0;

        ret = regulator_set_load(vreg->reg, ua);
        if (ret < 0) {
                dev_err(dev, "%s: %s set load (ua=%d) failed, err=%d\n",
                                __func__, vreg->name, ua, ret);
        }

        return ret;
}

static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
                                         struct ufs_vreg *vreg)
{
        return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
}

static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
                                         struct ufs_vreg *vreg)
{
        if (!vreg)
                return 0;

        return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
}

static int ufshcd_config_vreg(struct device *dev,
                struct ufs_vreg *vreg, bool on)
{
        if (regulator_count_voltages(vreg->reg) <= 0)
                return 0;

        return ufshcd_config_vreg_load(dev, vreg, on ? vreg->max_uA : 0);
}

static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
        int ret = 0;

        if (!vreg || vreg->enabled)
                goto out;

        ret = ufshcd_config_vreg(dev, vreg, true);
        if (!ret)
                ret = regulator_enable(vreg->reg);

        if (!ret)
                vreg->enabled = true;
        else
                dev_err(dev, "%s: %s enable failed, err=%d\n",
                                __func__, vreg->name, ret);
out:
        return ret;
}

static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
        int ret = 0;

        if (!vreg || !vreg->enabled || vreg->always_on)
                goto out;

        ret = regulator_disable(vreg->reg);

        if (!ret) {
                /* ignore errors on applying disable config */
                ufshcd_config_vreg(dev, vreg, false);
                vreg->enabled = false;
        } else {
                dev_err(dev, "%s: %s disable failed, err=%d\n",
                                __func__, vreg->name, ret);
        }
out:
        return ret;
}

static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
{
        int ret = 0;
        struct device *dev = hba->dev;
        struct ufs_vreg_info *info = &hba->vreg_info;

        ret = ufshcd_toggle_vreg(dev, info->vcc, on);
        if (ret)
                goto out;

        ret = ufshcd_toggle_vreg(dev, info->vccq, on);
        if (ret)
                goto out;

        ret = ufshcd_toggle_vreg(dev, info->vccq2, on);

out:
        if (ret) {
                ufshcd_toggle_vreg(dev, info->vccq2, false);
                ufshcd_toggle_vreg(dev, info->vccq, false);
                ufshcd_toggle_vreg(dev, info->vcc, false);
        }
        return ret;
}

static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
{
        struct ufs_vreg_info *info = &hba->vreg_info;

        return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);
}

int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
{
        int ret = 0;

        if (!vreg)
                goto out;

        vreg->reg = devm_regulator_get(dev, vreg->name);
        if (IS_ERR(vreg->reg)) {
                ret = PTR_ERR(vreg->reg);
                dev_err(dev, "%s: %s get failed, err=%d\n",
                                __func__, vreg->name, ret);
        }
out:
        return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_get_vreg);

static int ufshcd_init_vreg(struct ufs_hba *hba)
{
        int ret = 0;
        struct device *dev = hba->dev;
        struct ufs_vreg_info *info = &hba->vreg_info;

        ret = ufshcd_get_vreg(dev, info->vcc);
        if (ret)
                goto out;

        ret = ufshcd_get_vreg(dev, info->vccq);
        if (!ret)
                ret = ufshcd_get_vreg(dev, info->vccq2);
out:
        return ret;
}

static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
{
        struct ufs_vreg_info *info = &hba->vreg_info;

        return ufshcd_get_vreg(hba->dev, info->vdd_hba);
}

static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
{
        int ret = 0;
        struct ufs_clk_info *clki;
        struct list_head *head = &hba->clk_list_head;
        unsigned long flags;
        ktime_t start = ktime_get();
        bool clk_state_changed = false;

        if (list_empty(head))
                goto out;

        ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
        if (ret)
                return ret;

        list_for_each_entry(clki, head, list) {
                if (!IS_ERR_OR_NULL(clki->clk)) {
                        /*
                         * Don't disable clocks which are needed
                         * to keep the link active.
                         */
                        if (ufshcd_is_link_active(hba) &&
                            clki->keep_link_active)
                                continue;

                        clk_state_changed = on ^ clki->enabled;
                        if (on && !clki->enabled) {
                                ret = clk_prepare_enable(clki->clk);
                                if (ret) {
                                        dev_err(hba->dev, "%s: %s prepare enable failed, %d\n",
                                                __func__, clki->name, ret);
                                        goto out;
                                }
                        } else if (!on && clki->enabled) {
                                clk_disable_unprepare(clki->clk);
                        }
                        clki->enabled = on;
                        dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
                                        clki->name, on ? "en" : "dis");
                }
        }

        ret = ufshcd_vops_setup_clocks(hba, on, POST_CHANGE);
        if (ret)
                return ret;

out:
        if (ret) {
                list_for_each_entry(clki, head, list) {
                        if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
                                clk_disable_unprepare(clki->clk);
                }
        } else if (!ret && on) {
                spin_lock_irqsave(hba->host->host_lock, flags);
                hba->clk_gating.state = CLKS_ON;
                trace_ufshcd_clk_gating(dev_name(hba->dev),
                                        hba->clk_gating.state);
                spin_unlock_irqrestore(hba->host->host_lock, flags);
        }

        if (clk_state_changed)
                trace_ufshcd_profile_clk_gating(dev_name(hba->dev),
                        (on ? "on" : "off"),
                        ktime_to_us(ktime_sub(ktime_get(), start)), ret);
        return ret;
}

static enum ufs_ref_clk_freq ufshcd_parse_ref_clk_property(struct ufs_hba *hba)
{
        u32 freq;
        int ret = device_property_read_u32(hba->dev, "ref-clk-freq", &freq);

        if (ret) {
                dev_dbg(hba->dev, "Cannnot query 'ref-clk-freq' property = %d", ret);
                return REF_CLK_FREQ_INVAL;
        }

        return ufs_get_bref_clk_from_hz(freq);
}

static int ufshcd_init_clocks(struct ufs_hba *hba)
{
        int ret = 0;
        struct ufs_clk_info *clki;
        struct device *dev = hba->dev;
        struct list_head *head = &hba->clk_list_head;

        if (list_empty(head))
                goto out;

        list_for_each_entry(clki, head, list) {
                if (!clki->name)
                        continue;

                clki->clk = devm_clk_get(dev, clki->name);
                if (IS_ERR(clki->clk)) {
                        ret = PTR_ERR(clki->clk);
                        dev_err(dev, "%s: %s clk get failed, %d\n",
                                        __func__, clki->name, ret);
                        goto out;
                }

                /*
                 * Parse device ref clk freq as per device tree "ref_clk".
                 * Default dev_ref_clk_freq is set to REF_CLK_FREQ_INVAL
                 * in ufshcd_alloc_host().
                 */
                if (!strcmp(clki->name, "ref_clk"))
                        ufshcd_parse_dev_ref_clk_freq(hba, clki->clk);

                if (clki->max_freq) {
                        ret = clk_set_rate(clki->clk, clki->max_freq);
                        if (ret) {
                                dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
                                        __func__, clki->name,
                                        clki->max_freq, ret);
                                goto out;
                        }
                        clki->curr_freq = clki->max_freq;
                }
                dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
                                clki->name, clk_get_rate(clki->clk));
        }
out:
        return ret;
}

static int ufshcd_variant_hba_init(struct ufs_hba *hba)
{
        int err = 0;

        if (!hba->vops)
                goto out;

        err = ufshcd_vops_init(hba);
        if (err)
                dev_err(hba->dev, "%s: variant %s init failed err %d\n",
                        __func__, ufshcd_get_var_name(hba), err);
out:
        return err;
}

static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
{
        if (!hba->vops)
                return;

        ufshcd_vops_exit(hba);
}

static int ufshcd_hba_init(struct ufs_hba *hba)
{
        int err;

        /*
         * Handle host controller power separately from the UFS device power
         * rails as it will help controlling the UFS host controller power
         * collapse easily which is different than UFS device power collapse.
         * Also, enable the host controller power before we go ahead with rest
         * of the initialization here.
         */
        err = ufshcd_init_hba_vreg(hba);
        if (err)
                goto out;

        err = ufshcd_setup_hba_vreg(hba, true);
        if (err)
                goto out;

        err = ufshcd_init_clocks(hba);
        if (err)
                goto out_disable_hba_vreg;

        if (hba->dev_ref_clk_freq == REF_CLK_FREQ_INVAL)
                hba->dev_ref_clk_freq = ufshcd_parse_ref_clk_property(hba);

        err = ufshcd_setup_clocks(hba, true);
        if (err)
                goto out_disable_hba_vreg;

        err = ufshcd_init_vreg(hba);
        if (err)
                goto out_disable_clks;

        err = ufshcd_setup_vreg(hba, true);
        if (err)
                goto out_disable_clks;

        err = ufshcd_variant_hba_init(hba);
        if (err)
                goto out_disable_vreg;

        ufs_debugfs_hba_init(hba);

        hba->is_powered = true;
        goto out;

out_disable_vreg:
        ufshcd_setup_vreg(hba, false);
out_disable_clks:
        ufshcd_setup_clocks(hba, false);
out_disable_hba_vreg:
        ufshcd_setup_hba_vreg(hba, false);
out:
        return err;
}

static void ufshcd_hba_exit(struct ufs_hba *hba)
{
        if (hba->is_powered) {
                ufshcd_exit_clk_scaling(hba);
                ufshcd_exit_clk_gating(hba);
                if (hba->eh_wq)
                        destroy_workqueue(hba->eh_wq);
                ufs_debugfs_hba_exit(hba);
                ufshcd_variant_hba_exit(hba);
                ufshcd_setup_vreg(hba, false);
                ufshcd_setup_clocks(hba, false);
                ufshcd_setup_hba_vreg(hba, false);
                hba->is_powered = false;
                ufs_put_device_desc(hba);
        }
}

/**
 * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
 *                           power mode
 * @hba: per adapter instance
 * @pwr_mode: device power mode to set
 *
 * Returns 0 if requested power mode is set successfully
 * Returns < 0 if failed to set the requested power mode
 */
static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
                                     enum ufs_dev_pwr_mode pwr_mode)
{
        unsigned char cmd[6] = { START_STOP };
        struct scsi_sense_hdr sshdr;
        struct scsi_device *sdp;
        unsigned long flags;
        int ret, retries;

        spin_lock_irqsave(hba->host->host_lock, flags);
        sdp = hba->ufs_device_wlun;
        if (sdp) {
                ret = scsi_device_get(sdp);
                if (!ret && !scsi_device_online(sdp)) {
                        ret = -ENODEV;
                        scsi_device_put(sdp);
                }
        } else {
                ret = -ENODEV;
        }
        spin_unlock_irqrestore(hba->host->host_lock, flags);

        if (ret)
                return ret;

        /*
         * If scsi commands fail, the scsi mid-layer schedules scsi error-
         * handling, which would wait for host to be resumed. Since we know
         * we are functional while we are here, skip host resume in error
         * handling context.
         */
        hba->host->eh_noresume = 1;

        cmd[4] = pwr_mode << 4;

        /*
         * Current function would be generally called from the power management
         * callbacks hence set the RQF_PM flag so that it doesn't resume the
         * already suspended childs.
         */
        for (retries = 3; retries > 0; --retries) {
                ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
                                START_STOP_TIMEOUT, 0, 0, RQF_PM, NULL);
                if (!scsi_status_is_check_condition(ret) ||
                                !scsi_sense_valid(&sshdr) ||
                                sshdr.sense_key != UNIT_ATTENTION)
                        break;
        }
        if (ret) {
                sdev_printk(KERN_WARNING, sdp,
                            "START_STOP failed for power mode: %d, result %x\n",
                            pwr_mode, ret);
                if (ret > 0) {
                        if (scsi_sense_valid(&sshdr))
                                scsi_print_sense_hdr(sdp, NULL, &sshdr);
                        ret = -EIO;
                }
        }

        if (!ret)
                hba->curr_dev_pwr_mode = pwr_mode;

        scsi_device_put(sdp);
        hba->host->eh_noresume = 0;
        return ret;
}

static int ufshcd_link_state_transition(struct ufs_hba *hba,
                                        enum uic_link_state req_link_state,
                                        int check_for_bkops)
{
        int ret = 0;

        if (req_link_state == hba->uic_link_state)
                return 0;

        if (req_link_state == UIC_LINK_HIBERN8_STATE) {
                ret = ufshcd_uic_hibern8_enter(hba);
                if (!ret) {
                        ufshcd_set_link_hibern8(hba);
                } else {
                        dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
                                        __func__, ret);
                        goto out;
                }
        }
        /*
         * If autobkops is enabled, link can't be turned off because
         * turning off the link would also turn off the device, except in the
         * case of DeepSleep where the device is expected to remain powered.
         */
        else if ((req_link_state == UIC_LINK_OFF_STATE) &&
                 (!check_for_bkops || !hba->auto_bkops_enabled)) {
                /*
                 * Let's make sure that link is in low power mode, we are doing
                 * this currently by putting the link in Hibern8. Otherway to
                 * put the link in low power mode is to send the DME end point
                 * to device and then send the DME reset command to local
                 * unipro. But putting the link in hibern8 is much faster.
                 *
                 * Note also that putting the link in Hibern8 is a requirement
                 * for entering DeepSleep.
                 */
                ret = ufshcd_uic_hibern8_enter(hba);
                if (ret) {
                        dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
                                        __func__, ret);
                        goto out;
                }
                /*
                 * Change controller state to "reset state" which
                 * should also put the link in off/reset state
                 */
                ufshcd_hba_stop(hba);
                /*
                 * TODO: Check if we need any delay to make sure that
                 * controller is reset
                 */
                ufshcd_set_link_off(hba);
        }

out:
        return ret;
}

static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
{
        bool vcc_off = false;

        /*
         * It seems some UFS devices may keep drawing more than sleep current
         * (atleast for 500us) from UFS rails (especially from VCCQ rail).
         * To avoid this situation, add 2ms delay before putting these UFS
         * rails in LPM mode.
         */
        if (!ufshcd_is_link_active(hba) &&
            hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM)
                usleep_range(2000, 2100);

        /*
         * If UFS device is either in UFS_Sleep turn off VCC rail to save some
         * power.
         *
         * If UFS device and link is in OFF state, all power supplies (VCC,
         * VCCQ, VCCQ2) can be turned off if power on write protect is not
         * required. If UFS link is inactive (Hibern8 or OFF state) and device
         * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode.
         *
         * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
         * in low power state which would save some power.
         *
         * If Write Booster is enabled and the device needs to flush the WB
         * buffer OR if bkops status is urgent for WB, keep Vcc on.
         */
        if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
            !hba->dev_info.is_lu_power_on_wp) {
                ufshcd_setup_vreg(hba, false);
                vcc_off = true;
        } else if (!ufshcd_is_ufs_dev_active(hba)) {
                ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
                vcc_off = true;
                if (ufshcd_is_link_hibern8(hba) || ufshcd_is_link_off(hba)) {
                        ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
                        ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
                }
        }

        /*
         * Some UFS devices require delay after VCC power rail is turned-off.
         */
        if (vcc_off && hba->vreg_info.vcc &&
                hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM)
                usleep_range(5000, 5100);
}

#ifdef CONFIG_PM
static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
{
        int ret = 0;

        if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
            !hba->dev_info.is_lu_power_on_wp) {
                ret = ufshcd_setup_vreg(hba, true);
        } else if (!ufshcd_is_ufs_dev_active(hba)) {
                if (!ufshcd_is_link_active(hba)) {
                        ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
                        if (ret)
                                goto vcc_disable;
                        ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
                        if (ret)
                                goto vccq_lpm;
                }
                ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true);
        }
        goto out;

vccq_lpm:
        ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
vcc_disable:
        ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
out:
        return ret;
}
#endif /* CONFIG_PM */

static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
{
        if (ufshcd_is_link_off(hba) || ufshcd_can_aggressive_pc(hba))
                ufshcd_setup_hba_vreg(hba, false);
}

static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
{
        if (ufshcd_is_link_off(hba) || ufshcd_can_aggressive_pc(hba))
                ufshcd_setup_hba_vreg(hba, true);
}

static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
        int ret = 0;
        int check_for_bkops;
        enum ufs_pm_level pm_lvl;
        enum ufs_dev_pwr_mode req_dev_pwr_mode;
        enum uic_link_state req_link_state;

        hba->pm_op_in_progress = true;
        if (pm_op != UFS_SHUTDOWN_PM) {
                pm_lvl = pm_op == UFS_RUNTIME_PM ?
                         hba->rpm_lvl : hba->spm_lvl;
                req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
                req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
        } else {
                req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
                req_link_state = UIC_LINK_OFF_STATE;
        }

        ufshpb_suspend(hba);

        /*
         * If we can't transition into any of the low power modes
         * just gate the clocks.
         */
        ufshcd_hold(hba, false);
        hba->clk_gating.is_suspended = true;

        if (ufshcd_is_clkscaling_supported(hba))
                ufshcd_clk_scaling_suspend(hba, true);

        if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
                        req_link_state == UIC_LINK_ACTIVE_STATE) {
                goto vops_suspend;
        }

        if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
            (req_link_state == hba->uic_link_state))
                goto enable_scaling;

        /* UFS device & link must be active before we enter in this function */
        if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
                ret = -EINVAL;
                goto enable_scaling;
        }

        if (pm_op == UFS_RUNTIME_PM) {
                if (ufshcd_can_autobkops_during_suspend(hba)) {
                        /*
                         * The device is idle with no requests in the queue,
                         * allow background operations if bkops status shows
                         * that performance might be impacted.
                         */
                        ret = ufshcd_urgent_bkops(hba);
                        if (ret)
                                goto enable_scaling;
                } else {
                        /* make sure that auto bkops is disabled */
                        ufshcd_disable_auto_bkops(hba);
                }
                /*
                 * If device needs to do BKOP or WB buffer flush during
                 * Hibern8, keep device power mode as "active power mode"
                 * and VCC supply.
                 */
                hba->dev_info.b_rpm_dev_flush_capable =
                        hba->auto_bkops_enabled ||
                        (((req_link_state == UIC_LINK_HIBERN8_STATE) ||
                        ((req_link_state == UIC_LINK_ACTIVE_STATE) &&
                        ufshcd_is_auto_hibern8_enabled(hba))) &&
                        ufshcd_wb_need_flush(hba));
        }

        flush_work(&hba->eeh_work);

        ret = ufshcd_vops_suspend(hba, pm_op, PRE_CHANGE);
        if (ret)
                goto enable_scaling;

        if (req_dev_pwr_mode != hba->curr_dev_pwr_mode) {
                if (pm_op != UFS_RUNTIME_PM)
                        /* ensure that bkops is disabled */
                        ufshcd_disable_auto_bkops(hba);

                if (!hba->dev_info.b_rpm_dev_flush_capable) {
                        ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
                        if (ret)
                                goto enable_scaling;
                }
        }

        /*
         * In the case of DeepSleep, the device is expected to remain powered
         * with the link off, so do not check for bkops.
         */
        check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
        ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
        if (ret)
                goto set_dev_active;

vops_suspend:
        /*
         * Call vendor specific suspend callback. As these callbacks may access
         * vendor specific host controller register space call them before the
         * host clocks are ON.
         */
        ret = ufshcd_vops_suspend(hba, pm_op, POST_CHANGE);
        if (ret)
                goto set_link_active;
        goto out;

set_link_active:
        /*
         * Device hardware reset is required to exit DeepSleep. Also, for
         * DeepSleep, the link is off so host reset and restore will be done
         * further below.
         */
        if (ufshcd_is_ufs_dev_deepsleep(hba)) {
                ufshcd_device_reset(hba);
                WARN_ON(!ufshcd_is_link_off(hba));
        }
        if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba))
                ufshcd_set_link_active(hba);
        else if (ufshcd_is_link_off(hba))
                ufshcd_host_reset_and_restore(hba);
set_dev_active:
        /* Can also get here needing to exit DeepSleep */
        if (ufshcd_is_ufs_dev_deepsleep(hba)) {
                ufshcd_device_reset(hba);
                ufshcd_host_reset_and_restore(hba);
        }
        if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
                ufshcd_disable_auto_bkops(hba);
enable_scaling:
        if (ufshcd_is_clkscaling_supported(hba))
                ufshcd_clk_scaling_suspend(hba, false);

        hba->dev_info.b_rpm_dev_flush_capable = false;
out:
        if (hba->dev_info.b_rpm_dev_flush_capable) {
                schedule_delayed_work(&hba->rpm_dev_flush_recheck_work,
                        msecs_to_jiffies(RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS));
        }

        if (ret) {
                ufshcd_update_evt_hist(hba, UFS_EVT_WL_SUSP_ERR, (u32)ret);
                hba->clk_gating.is_suspended = false;
                ufshcd_release(hba);
                ufshpb_resume(hba);
        }
        hba->pm_op_in_progress = false;
        return ret;
}

#ifdef CONFIG_PM
static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
        int ret;
        enum uic_link_state old_link_state = hba->uic_link_state;

        hba->pm_op_in_progress = true;

        /*
         * Call vendor specific resume callback. As these callbacks may access
         * vendor specific host controller register space call them when the
         * host clocks are ON.
         */
        ret = ufshcd_vops_resume(hba, pm_op);
        if (ret)
                goto out;

        /* For DeepSleep, the only supported option is to have the link off */
        WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba));

        if (ufshcd_is_link_hibern8(hba)) {
                ret = ufshcd_uic_hibern8_exit(hba);
                if (!ret) {
                        ufshcd_set_link_active(hba);
                } else {
                        dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
                                        __func__, ret);
                        goto vendor_suspend;
                }
        } else if (ufshcd_is_link_off(hba)) {
                /*
                 * A full initialization of the host and the device is
                 * required since the link was put to off during suspend.
                 * Note, in the case of DeepSleep, the device will exit
                 * DeepSleep due to device reset.
                 */
                ret = ufshcd_reset_and_restore(hba);
                /*
                 * ufshcd_reset_and_restore() should have already
                 * set the link state as active
                 */
                if (ret || !ufshcd_is_link_active(hba))
                        goto vendor_suspend;
        }

        if (!ufshcd_is_ufs_dev_active(hba)) {
                ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
                if (ret)
                        goto set_old_link_state;
        }

        if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
                ufshcd_enable_auto_bkops(hba);
        else
                /*
                 * If BKOPs operations are urgently needed at this moment then
                 * keep auto-bkops enabled or else disable it.
                 */
                ufshcd_urgent_bkops(hba);

        if (hba->ee_usr_mask)
                ufshcd_write_ee_control(hba);

        if (ufshcd_is_clkscaling_supported(hba))
                ufshcd_clk_scaling_suspend(hba, false);

        if (hba->dev_info.b_rpm_dev_flush_capable) {
                hba->dev_info.b_rpm_dev_flush_capable = false;
                cancel_delayed_work(&hba->rpm_dev_flush_recheck_work);
        }

        /* Enable Auto-Hibernate if configured */
        ufshcd_auto_hibern8_enable(hba);

        ufshpb_resume(hba);
        goto out;

set_old_link_state:
        ufshcd_link_state_transition(hba, old_link_state, 0);
vendor_suspend:
        ufshcd_vops_suspend(hba, pm_op, PRE_CHANGE);
        ufshcd_vops_suspend(hba, pm_op, POST_CHANGE);
out:
        if (ret)
                ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
        hba->clk_gating.is_suspended = false;
        ufshcd_release(hba);
        hba->pm_op_in_progress = false;
        return ret;
}

static int ufshcd_wl_runtime_suspend(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba;
        int ret;
        ktime_t start = ktime_get();

        hba = shost_priv(sdev->host);

        ret = __ufshcd_wl_suspend(hba, UFS_RUNTIME_PM);
        if (ret)
                dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);

        trace_ufshcd_wl_runtime_suspend(dev_name(dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);

        return ret;
}

static int ufshcd_wl_runtime_resume(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba;
        int ret = 0;
        ktime_t start = ktime_get();

        hba = shost_priv(sdev->host);

        ret = __ufshcd_wl_resume(hba, UFS_RUNTIME_PM);
        if (ret)
                dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);

        trace_ufshcd_wl_runtime_resume(dev_name(dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);

        return ret;
}
#endif

#ifdef CONFIG_PM_SLEEP
static int ufshcd_wl_suspend(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba;
        int ret = 0;
        ktime_t start = ktime_get();

        hba = shost_priv(sdev->host);
        down(&hba->host_sem);

        if (pm_runtime_suspended(dev))
                goto out;

        ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
        if (ret) {
                dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__,  ret);
                up(&hba->host_sem);
        }

out:
        if (!ret)
                hba->is_sys_suspended = true;
        trace_ufshcd_wl_suspend(dev_name(dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);

        return ret;
}

static int ufshcd_wl_resume(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba;
        int ret = 0;
        ktime_t start = ktime_get();

        hba = shost_priv(sdev->host);

        if (pm_runtime_suspended(dev))
                goto out;

        ret = __ufshcd_wl_resume(hba, UFS_SYSTEM_PM);
        if (ret)
                dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
out:
        trace_ufshcd_wl_resume(dev_name(dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        if (!ret)
                hba->is_sys_suspended = false;
        up(&hba->host_sem);
        return ret;
}
#endif

static void ufshcd_wl_shutdown(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba;

        hba = shost_priv(sdev->host);

        down(&hba->host_sem);
        hba->shutting_down = true;
        up(&hba->host_sem);

        /* Turn on everything while shutting down */
        ufshcd_rpm_get_sync(hba);
        scsi_device_quiesce(sdev);
        shost_for_each_device(sdev, hba->host) {
                if (sdev == hba->ufs_device_wlun)
                        continue;
                scsi_device_quiesce(sdev);
        }
        __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
}

/**
 * ufshcd_suspend - helper function for suspend operations
 * @hba: per adapter instance
 *
 * This function will put disable irqs, turn off clocks
 * and set vreg and hba-vreg in lpm mode.
 */
static int ufshcd_suspend(struct ufs_hba *hba)
{
        int ret;

        if (!hba->is_powered)
                return 0;
        /*
         * Disable the host irq as host controller as there won't be any
         * host controller transaction expected till resume.
         */
        ufshcd_disable_irq(hba);
        ret = ufshcd_setup_clocks(hba, false);
        if (ret) {
                ufshcd_enable_irq(hba);
                return ret;
        }
        if (ufshcd_is_clkgating_allowed(hba)) {
                hba->clk_gating.state = CLKS_OFF;
                trace_ufshcd_clk_gating(dev_name(hba->dev),
                                        hba->clk_gating.state);
        }

        ufshcd_vreg_set_lpm(hba);
        /* Put the host controller in low power mode if possible */
        ufshcd_hba_vreg_set_lpm(hba);
        return ret;
}

#ifdef CONFIG_PM
/**
 * ufshcd_resume - helper function for resume operations
 * @hba: per adapter instance
 *
 * This function basically turns on the regulators, clocks and
 * irqs of the hba.
 *
 * Returns 0 for success and non-zero for failure
 */
static int ufshcd_resume(struct ufs_hba *hba)
{
        int ret;

        if (!hba->is_powered)
                return 0;

        ufshcd_hba_vreg_set_hpm(hba);
        ret = ufshcd_vreg_set_hpm(hba);
        if (ret)
                goto out;

        /* Make sure clocks are enabled before accessing controller */
        ret = ufshcd_setup_clocks(hba, true);
        if (ret)
                goto disable_vreg;

        /* enable the host irq as host controller would be active soon */
        ufshcd_enable_irq(hba);
        goto out;

disable_vreg:
        ufshcd_vreg_set_lpm(hba);
out:
        if (ret)
                ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
        return ret;
}
#endif /* CONFIG_PM */

#ifdef CONFIG_PM_SLEEP
/**
 * ufshcd_system_suspend - system suspend callback
 * @dev: Device associated with the UFS controller.
 *
 * Executed before putting the system into a sleep state in which the contents
 * of main memory are preserved.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_system_suspend(struct device *dev)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        int ret = 0;
        ktime_t start = ktime_get();

        if (pm_runtime_suspended(hba->dev))
                goto out;

        ret = ufshcd_suspend(hba);
out:
        trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        return ret;
}
EXPORT_SYMBOL(ufshcd_system_suspend);

/**
 * ufshcd_system_resume - system resume callback
 * @dev: Device associated with the UFS controller.
 *
 * Executed after waking the system up from a sleep state in which the contents
 * of main memory were preserved.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_system_resume(struct device *dev)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        ktime_t start = ktime_get();
        int ret = 0;

        if (pm_runtime_suspended(hba->dev))
                goto out;

        ret = ufshcd_resume(hba);

out:
        trace_ufshcd_system_resume(dev_name(hba->dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);

        return ret;
}
EXPORT_SYMBOL(ufshcd_system_resume);
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM
/**
 * ufshcd_runtime_suspend - runtime suspend callback
 * @dev: Device associated with the UFS controller.
 *
 * Check the description of ufshcd_suspend() function for more details.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_runtime_suspend(struct device *dev)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        int ret;
        ktime_t start = ktime_get();

        ret = ufshcd_suspend(hba);

        trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_suspend);

/**
 * ufshcd_runtime_resume - runtime resume routine
 * @dev: Device associated with the UFS controller.
 *
 * This function basically brings controller
 * to active state. Following operations are done in this function:
 *
 * 1. Turn on all the controller related clocks
 * 2. Turn ON VCC rail
 */
int ufshcd_runtime_resume(struct device *dev)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        int ret;
        ktime_t start = ktime_get();

        ret = ufshcd_resume(hba);

        trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
                ktime_to_us(ktime_sub(ktime_get(), start)),
                hba->curr_dev_pwr_mode, hba->uic_link_state);
        return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_resume);
#endif /* CONFIG_PM */

/**
 * ufshcd_shutdown - shutdown routine
 * @hba: per adapter instance
 *
 * This function would turn off both UFS device and UFS hba
 * regulators. It would also disable clocks.
 *
 * Returns 0 always to allow force shutdown even in case of errors.
 */
int ufshcd_shutdown(struct ufs_hba *hba)
{
        if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
                goto out;

        pm_runtime_get_sync(hba->dev);

        ufshcd_suspend(hba);
out:
        hba->is_powered = false;
        /* allow force shutdown even in case of errors */
        return 0;
}
EXPORT_SYMBOL(ufshcd_shutdown);

/**
 * ufshcd_remove - de-allocate SCSI host and host memory space
 *              data structure memory
 * @hba: per adapter instance
 */
void ufshcd_remove(struct ufs_hba *hba)
{
        if (hba->ufs_device_wlun)
                ufshcd_rpm_get_sync(hba);
        ufs_hwmon_remove(hba);
        ufs_bsg_remove(hba);
        ufshpb_remove(hba);
        ufs_sysfs_remove_nodes(hba->dev);
        blk_cleanup_queue(hba->tmf_queue);
        blk_mq_free_tag_set(&hba->tmf_tag_set);
        scsi_remove_host(hba->host);
        /* disable interrupts */
        ufshcd_disable_intr(hba, hba->intr_mask);
        ufshcd_hba_stop(hba);
        ufshcd_hba_exit(hba);
}
EXPORT_SYMBOL_GPL(ufshcd_remove);

/**
 * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
 * @hba: pointer to Host Bus Adapter (HBA)
 */
void ufshcd_dealloc_host(struct ufs_hba *hba)
{
        scsi_host_put(hba->host);
}
EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);

/**
 * ufshcd_set_dma_mask - Set dma mask based on the controller
 *                       addressing capability
 * @hba: per adapter instance
 *
 * Returns 0 for success, non-zero for failure
 */
static int ufshcd_set_dma_mask(struct ufs_hba *hba)
{
        if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
                if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
                        return 0;
        }
        return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
}

/**
 * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
 * @dev: pointer to device handle
 * @hba_handle: driver private handle
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
{
        struct Scsi_Host *host;
        struct ufs_hba *hba;
        int err = 0;

        if (!dev) {
                dev_err(dev,
                "Invalid memory reference for dev is NULL\n");
                err = -ENODEV;
                goto out_error;
        }

        host = scsi_host_alloc(&ufshcd_driver_template,
                                sizeof(struct ufs_hba));
        if (!host) {
                dev_err(dev, "scsi_host_alloc failed\n");
                err = -ENOMEM;
                goto out_error;
        }
        host->nr_maps = HCTX_TYPE_POLL + 1;
        hba = shost_priv(host);
        hba->host = host;
        hba->dev = dev;
        hba->dev_ref_clk_freq = REF_CLK_FREQ_INVAL;
        hba->nop_out_timeout = NOP_OUT_TIMEOUT;
        INIT_LIST_HEAD(&hba->clk_list_head);
        spin_lock_init(&hba->outstanding_lock);

        *hba_handle = hba;

out_error:
        return err;
}
EXPORT_SYMBOL(ufshcd_alloc_host);

/* This function exists because blk_mq_alloc_tag_set() requires this. */
static blk_status_t ufshcd_queue_tmf(struct blk_mq_hw_ctx *hctx,
                                     const struct blk_mq_queue_data *qd)
{
        WARN_ON_ONCE(true);
        return BLK_STS_NOTSUPP;
}

static const struct blk_mq_ops ufshcd_tmf_ops = {
        .queue_rq = ufshcd_queue_tmf,
};

/**
 * ufshcd_init - Driver initialization routine
 * @hba: per-adapter instance
 * @mmio_base: base register address
 * @irq: Interrupt line of device
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
{
        int err;
        struct Scsi_Host *host = hba->host;
        struct device *dev = hba->dev;
        char eh_wq_name[sizeof("ufs_eh_wq_00")];

        /*
         * dev_set_drvdata() must be called before any callbacks are registered
         * that use dev_get_drvdata() (frequency scaling, clock scaling, hwmon,
         * sysfs).
         */
        dev_set_drvdata(dev, hba);

        if (!mmio_base) {
                dev_err(hba->dev,
                "Invalid memory reference for mmio_base is NULL\n");
                err = -ENODEV;
                goto out_error;
        }

        hba->mmio_base = mmio_base;
        hba->irq = irq;
        hba->vps = &ufs_hba_vps;

        err = ufshcd_hba_init(hba);
        if (err)
                goto out_error;

        /* Read capabilities registers */
        err = ufshcd_hba_capabilities(hba);
        if (err)
                goto out_disable;

        /* Get UFS version supported by the controller */
        hba->ufs_version = ufshcd_get_ufs_version(hba);

        /* Get Interrupt bit mask per version */
        hba->intr_mask = ufshcd_get_intr_mask(hba);

        err = ufshcd_set_dma_mask(hba);
        if (err) {
                dev_err(hba->dev, "set dma mask failed\n");
                goto out_disable;
        }

        /* Allocate memory for host memory space */
        err = ufshcd_memory_alloc(hba);
        if (err) {
                dev_err(hba->dev, "Memory allocation failed\n");
                goto out_disable;
        }

        /* Configure LRB */
        ufshcd_host_memory_configure(hba);

        host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
        host->cmd_per_lun = hba->nutrs - UFSHCD_NUM_RESERVED;
        host->max_id = UFSHCD_MAX_ID;
        host->max_lun = UFS_MAX_LUNS;
        host->max_channel = UFSHCD_MAX_CHANNEL;
        host->unique_id = host->host_no;
        host->max_cmd_len = UFS_CDB_SIZE;

        hba->max_pwr_info.is_valid = false;

        /* Initialize work queues */
        snprintf(eh_wq_name, sizeof(eh_wq_name), "ufs_eh_wq_%d",
                 hba->host->host_no);
        hba->eh_wq = create_singlethread_workqueue(eh_wq_name);
        if (!hba->eh_wq) {
                dev_err(hba->dev, "%s: failed to create eh workqueue\n",
                        __func__);
                err = -ENOMEM;
                goto out_disable;
        }
        INIT_WORK(&hba->eh_work, ufshcd_err_handler);
        INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);

        sema_init(&hba->host_sem, 1);

        /* Initialize UIC command mutex */
        mutex_init(&hba->uic_cmd_mutex);

        /* Initialize mutex for device management commands */
        mutex_init(&hba->dev_cmd.lock);

        /* Initialize mutex for exception event control */
        mutex_init(&hba->ee_ctrl_mutex);

        init_rwsem(&hba->clk_scaling_lock);

        ufshcd_init_clk_gating(hba);

        ufshcd_init_clk_scaling(hba);

        /*
         * In order to avoid any spurious interrupt immediately after
         * registering UFS controller interrupt handler, clear any pending UFS
         * interrupt status and disable all the UFS interrupts.
         */
        ufshcd_writel(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS),
                      REG_INTERRUPT_STATUS);
        ufshcd_writel(hba, 0, REG_INTERRUPT_ENABLE);
        /*
         * Make sure that UFS interrupts are disabled and any pending interrupt
         * status is cleared before registering UFS interrupt handler.
         */
        mb();

        /* IRQ registration */
        err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
        if (err) {
                dev_err(hba->dev, "request irq failed\n");
                goto out_disable;
        } else {
                hba->is_irq_enabled = true;
        }

        err = scsi_add_host(host, hba->dev);
        if (err) {
                dev_err(hba->dev, "scsi_add_host failed\n");
                goto out_disable;
        }

        hba->tmf_tag_set = (struct blk_mq_tag_set) {
                .nr_hw_queues   = 1,
                .queue_depth    = hba->nutmrs,
                .ops            = &ufshcd_tmf_ops,
                .flags          = BLK_MQ_F_NO_SCHED,
        };
        err = blk_mq_alloc_tag_set(&hba->tmf_tag_set);
        if (err < 0)
                goto out_remove_scsi_host;
        hba->tmf_queue = blk_mq_init_queue(&hba->tmf_tag_set);
        if (IS_ERR(hba->tmf_queue)) {
                err = PTR_ERR(hba->tmf_queue);
                goto free_tmf_tag_set;
        }
        hba->tmf_rqs = devm_kcalloc(hba->dev, hba->nutmrs,
                                    sizeof(*hba->tmf_rqs), GFP_KERNEL);
        if (!hba->tmf_rqs) {
                err = -ENOMEM;
                goto free_tmf_queue;
        }

        /* Reset the attached device */
        ufshcd_device_reset(hba);

        ufshcd_init_crypto(hba);

        /* Host controller enable */
        err = ufshcd_hba_enable(hba);
        if (err) {
                dev_err(hba->dev, "Host controller enable failed\n");
                ufshcd_print_evt_hist(hba);
                ufshcd_print_host_state(hba);
                goto free_tmf_queue;
        }

        /*
         * Set the default power management level for runtime and system PM.
         * Default power saving mode is to keep UFS link in Hibern8 state
         * and UFS device in sleep state.
         */
        hba->rpm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
                                                UFS_SLEEP_PWR_MODE,
                                                UIC_LINK_HIBERN8_STATE);
        hba->spm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
                                                UFS_SLEEP_PWR_MODE,
                                                UIC_LINK_HIBERN8_STATE);

        INIT_DELAYED_WORK(&hba->rpm_dev_flush_recheck_work,
                          ufshcd_rpm_dev_flush_recheck_work);

        /* Set the default auto-hiberate idle timer value to 150 ms */
        if (ufshcd_is_auto_hibern8_supported(hba) && !hba->ahit) {
                hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 150) |
                            FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
        }

        /* Hold auto suspend until async scan completes */
        pm_runtime_get_sync(dev);
        atomic_set(&hba->scsi_block_reqs_cnt, 0);
        /*
         * We are assuming that device wasn't put in sleep/power-down
         * state exclusively during the boot stage before kernel.
         * This assumption helps avoid doing link startup twice during
         * ufshcd_probe_hba().
         */
        ufshcd_set_ufs_dev_active(hba);

        async_schedule(ufshcd_async_scan, hba);
        ufs_sysfs_add_nodes(hba->dev);

        device_enable_async_suspend(dev);
        return 0;

free_tmf_queue:
        blk_cleanup_queue(hba->tmf_queue);
free_tmf_tag_set:
        blk_mq_free_tag_set(&hba->tmf_tag_set);
out_remove_scsi_host:
        scsi_remove_host(hba->host);
out_disable:
        hba->is_irq_enabled = false;
        ufshcd_hba_exit(hba);
out_error:
        return err;
}
EXPORT_SYMBOL_GPL(ufshcd_init);

void ufshcd_resume_complete(struct device *dev)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);

        if (hba->complete_put) {
                ufshcd_rpm_put(hba);
                hba->complete_put = false;
        }
}
EXPORT_SYMBOL_GPL(ufshcd_resume_complete);

static bool ufshcd_rpm_ok_for_spm(struct ufs_hba *hba)
{
        struct device *dev = &hba->ufs_device_wlun->sdev_gendev;
        enum ufs_dev_pwr_mode dev_pwr_mode;
        enum uic_link_state link_state;
        unsigned long flags;
        bool res;

        spin_lock_irqsave(&dev->power.lock, flags);
        dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl);
        link_state = ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl);
        res = pm_runtime_suspended(dev) &&
              hba->curr_dev_pwr_mode == dev_pwr_mode &&
              hba->uic_link_state == link_state &&
              !hba->dev_info.b_rpm_dev_flush_capable;
        spin_unlock_irqrestore(&dev->power.lock, flags);

        return res;
}

int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm)
{
        struct ufs_hba *hba = dev_get_drvdata(dev);
        int ret;

        /*
         * SCSI assumes that runtime-pm and system-pm for scsi drivers
         * are same. And it doesn't wake up the device for system-suspend
         * if it's runtime suspended. But ufs doesn't follow that.
         * Refer ufshcd_resume_complete()
         */
        if (hba->ufs_device_wlun) {
                /* Prevent runtime suspend */
                ufshcd_rpm_get_noresume(hba);
                /*
                 * Check if already runtime suspended in same state as system
                 * suspend would be.
                 */
                if (!rpm_ok_for_spm || !ufshcd_rpm_ok_for_spm(hba)) {
                        /* RPM state is not ok for SPM, so runtime resume */
                        ret = ufshcd_rpm_resume(hba);
                        if (ret < 0 && ret != -EACCES) {
                                ufshcd_rpm_put(hba);
                                return ret;
                        }
                }
                hba->complete_put = true;
        }
        return 0;
}
EXPORT_SYMBOL_GPL(__ufshcd_suspend_prepare);

int ufshcd_suspend_prepare(struct device *dev)
{
        return __ufshcd_suspend_prepare(dev, true);
}
EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);

#ifdef CONFIG_PM_SLEEP
static int ufshcd_wl_poweroff(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ufs_hba *hba = shost_priv(sdev->host);

        __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
        return 0;
}
#endif

static int ufshcd_wl_probe(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);

        if (!is_device_wlun(sdev))
                return -ENODEV;

        blk_pm_runtime_init(sdev->request_queue, dev);
        pm_runtime_set_autosuspend_delay(dev, 0);
        pm_runtime_allow(dev);

        return  0;
}

static int ufshcd_wl_remove(struct device *dev)
{
        pm_runtime_forbid(dev);
        return 0;
}

static const struct dev_pm_ops ufshcd_wl_pm_ops = {
#ifdef CONFIG_PM_SLEEP
        .suspend = ufshcd_wl_suspend,
        .resume = ufshcd_wl_resume,
        .freeze = ufshcd_wl_suspend,
        .thaw = ufshcd_wl_resume,
        .poweroff = ufshcd_wl_poweroff,
        .restore = ufshcd_wl_resume,
#endif
        SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
};

/*
 * ufs_dev_wlun_template - describes ufs device wlun
 * ufs-device wlun - used to send pm commands
 * All luns are consumers of ufs-device wlun.
 *
 * Currently, no sd driver is present for wluns.
 * Hence the no specific pm operations are performed.
 * With ufs design, SSU should be sent to ufs-device wlun.
 * Hence register a scsi driver for ufs wluns only.
 */
static struct scsi_driver ufs_dev_wlun_template = {
        .gendrv = {
                .name = "ufs_device_wlun",
                .owner = THIS_MODULE,
                .probe = ufshcd_wl_probe,
                .remove = ufshcd_wl_remove,
                .pm = &ufshcd_wl_pm_ops,
                .shutdown = ufshcd_wl_shutdown,
        },
};

static int __init ufshcd_core_init(void)
{
        int ret;

        /* Verify that there are no gaps in struct utp_transfer_cmd_desc. */
        static_assert(sizeof(struct utp_transfer_cmd_desc) ==
                      2 * ALIGNED_UPIU_SIZE +
                              SG_ALL * sizeof(struct ufshcd_sg_entry));

        ufs_debugfs_init();

        ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
        if (ret)
                ufs_debugfs_exit();
        return ret;
}

static void __exit ufshcd_core_exit(void)
{
        ufs_debugfs_exit();
        scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
}

module_init(ufshcd_core_init);
module_exit(ufshcd_core_exit);

MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
MODULE_DESCRIPTION("Generic UFS host controller driver Core");
MODULE_LICENSE("GPL");