drivers/block/mtip32xx/mtip32xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for the Micron P320 SSD
   4  *   Copyright (C) 2011 Micron Technology, Inc.
   5  *
   6  * Portions of this code were derived from works subjected to the
   7  * following copyright:
   8  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   9  */
  10
  11 #include <linux/pci.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/ata.h>
  14 #include <linux/delay.h>
  15 #include <linux/hdreg.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/random.h>
  18 #include <linux/smp.h>
  19 #include <linux/compat.h>
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/blk-mq.h>
  24 #include <linux/bio.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/idr.h>
  27 #include <linux/kthread.h>
  28 #include <../drivers/ata/ahci.h>
  29 #include <linux/export.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/prefetch.h>
  32 #include <linux/numa.h>
  33 #include "mtip32xx.h"
  34
  35 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  36
  37 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  38 #define AHCI_RX_FIS_SZ          0x100
  39 #define AHCI_RX_FIS_OFFSET      0x0
  40 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  41 #define AHCI_IDFY_OFFSET        0x400
  42 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  43 #define AHCI_SECTBUF_OFFSET     0x800
  44 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  45 #define AHCI_SMARTBUF_OFFSET    0xC00
  46 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  47 #define BLOCK_DMA_ALLOC_SZ      4096
  48
  49 /* DMA region containing command table (should be 8192 bytes) */
  50 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  51 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  52 #define AHCI_CMD_TBL_OFFSET     0x0
  53
  54 /* DMA region per command (contains header and SGL) */
  55 #define AHCI_CMD_TBL_HDR_SZ     0x80
  56 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  57 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  58 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  59 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  60
  61
  62 #define HOST_CAP_NZDMA          (1 << 19)
  63 #define HOST_HSORG              0xFC
  64 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  65 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  66 #define HSORG_HWREV             0xFF00
  67 #define HSORG_STYLE             0x8
  68 #define HSORG_SLOTGROUPS        0x7
  69
  70 #define PORT_COMMAND_ISSUE      0x38
  71 #define PORT_SDBV               0x7C
  72
  73 #define PORT_OFFSET             0x100
  74 #define PORT_MEM_SIZE           0x80
  75
  76 #define PORT_IRQ_ERR \
  77         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  78          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  79          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  80          PORT_IRQ_OVERFLOW)
  81 #define PORT_IRQ_LEGACY \
  82         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  83 #define PORT_IRQ_HANDLED \
  84         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  85          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  86          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  87 #define DEF_PORT_IRQ \
  88         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  89
  90 /* product numbers */
  91 #define MTIP_PRODUCT_UNKNOWN    0x00
  92 #define MTIP_PRODUCT_ASICFPGA   0x11
  93
  94 /* Device instance number, incremented each time a device is probed. */
  95 static int instance;
  96
  97 /*
  98  * Global variable used to hold the major block device number
  99  * allocated in mtip_init().
 100  */
 101 static int mtip_major;
 102 static struct dentry *dfs_parent;
 103
 104 static u32 cpu_use[NR_CPUS];
 105
 106 static DEFINE_IDA(rssd_index_ida);
 107
 108 static int mtip_block_initialize(struct driver_data *dd);
 109
 110 #ifdef CONFIG_COMPAT
 111 struct mtip_compat_ide_task_request_s {
 112         __u8            io_ports[8];
 113         __u8            hob_ports[8];
 114         ide_reg_valid_t out_flags;
 115         ide_reg_valid_t in_flags;
 116         int             data_phase;
 117         int             req_cmd;
 118         compat_ulong_t  out_size;
 119         compat_ulong_t  in_size;
 120 };
 121 #endif
 122
 123 /*
 124  * This function check_for_surprise_removal is called
 125  * while card is removed from the system and it will
 126  * read the vendor id from the configuration space
 127  *
 128  * @pdev Pointer to the pci_dev structure.
 129  *
 130  * return value
 131  *       true if device removed, else false
 132  */
 133 static bool mtip_check_surprise_removal(struct driver_data *dd)
 134 {
 135         u16 vendor_id = 0;
 136
 137         if (dd->sr)
 138                 return true;
 139
 140        /* Read the vendorID from the configuration space */
 141         pci_read_config_word(dd->pdev, 0x00, &vendor_id);
 142         if (vendor_id == 0xFFFF) {
 143                 dd->sr = true;
 144                 if (dd->disk)
 145                         blk_mark_disk_dead(dd->disk);
 146                 return true; /* device removed */
 147         }
 148
 149         return false; /* device present */
 150 }
 151
 152 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 153                                           unsigned int tag)
 154 {
 155         return blk_mq_rq_to_pdu(blk_mq_tag_to_rq(dd->tags.tags[0], tag));
 156 }
 157
 158 /*
 159  * Reset the HBA (without sleeping)
 160  *
 161  * @dd Pointer to the driver data structure.
 162  *
 163  * return value
 164  *      0       The reset was successful.
 165  *      -1      The HBA Reset bit did not clear.
 166  */
 167 static int mtip_hba_reset(struct driver_data *dd)
 168 {
 169         unsigned long timeout;
 170
 171         /* Set the reset bit */
 172         writel(HOST_RESET, dd->mmio + HOST_CTL);
 173
 174         /* Flush */
 175         readl(dd->mmio + HOST_CTL);
 176
 177         /*
 178          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 179          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 180          */
 181         timeout = jiffies + msecs_to_jiffies(10000);
 182         do {
 183                 mdelay(10);
 184                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 185                         return -1;
 186
 187         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 188                  && time_before(jiffies, timeout));
 189
 190         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 191                 return -1;
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * Issue a command to the hardware.
 198  *
 199  * Set the appropriate bit in the s_active and Command Issue hardware
 200  * registers, causing hardware command processing to begin.
 201  *
 202  * @port Pointer to the port structure.
 203  * @tag  The tag of the command to be issued.
 204  *
 205  * return value
 206  *      None
 207  */
 208 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 209 {
 210         int group = tag >> 5;
 211
 212         /* guard SACT and CI registers */
 213         spin_lock(&port->cmd_issue_lock[group]);
 214         writel((1 << MTIP_TAG_BIT(tag)),
 215                         port->s_active[MTIP_TAG_INDEX(tag)]);
 216         writel((1 << MTIP_TAG_BIT(tag)),
 217                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 218         spin_unlock(&port->cmd_issue_lock[group]);
 219 }
 220
 221 /*
 222  * Enable/disable the reception of FIS
 223  *
 224  * @port   Pointer to the port data structure
 225  * @enable 1 to enable, 0 to disable
 226  *
 227  * return value
 228  *      Previous state: 1 enabled, 0 disabled
 229  */
 230 static int mtip_enable_fis(struct mtip_port *port, int enable)
 231 {
 232         u32 tmp;
 233
 234         /* enable FIS reception */
 235         tmp = readl(port->mmio + PORT_CMD);
 236         if (enable)
 237                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 238         else
 239                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 240
 241         /* Flush */
 242         readl(port->mmio + PORT_CMD);
 243
 244         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 245 }
 246
 247 /*
 248  * Enable/disable the DMA engine
 249  *
 250  * @port   Pointer to the port data structure
 251  * @enable 1 to enable, 0 to disable
 252  *
 253  * return value
 254  *      Previous state: 1 enabled, 0 disabled.
 255  */
 256 static int mtip_enable_engine(struct mtip_port *port, int enable)
 257 {
 258         u32 tmp;
 259
 260         /* enable FIS reception */
 261         tmp = readl(port->mmio + PORT_CMD);
 262         if (enable)
 263                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 264         else
 265                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 266
 267         readl(port->mmio + PORT_CMD);
 268         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 269 }
 270
 271 /*
 272  * Enables the port DMA engine and FIS reception.
 273  *
 274  * return value
 275  *      None
 276  */
 277 static inline void mtip_start_port(struct mtip_port *port)
 278 {
 279         /* Enable FIS reception */
 280         mtip_enable_fis(port, 1);
 281
 282         /* Enable the DMA engine */
 283         mtip_enable_engine(port, 1);
 284 }
 285
 286 /*
 287  * Deinitialize a port by disabling port interrupts, the DMA engine,
 288  * and FIS reception.
 289  *
 290  * @port Pointer to the port structure
 291  *
 292  * return value
 293  *      None
 294  */
 295 static inline void mtip_deinit_port(struct mtip_port *port)
 296 {
 297         /* Disable interrupts on this port */
 298         writel(0, port->mmio + PORT_IRQ_MASK);
 299
 300         /* Disable the DMA engine */
 301         mtip_enable_engine(port, 0);
 302
 303         /* Disable FIS reception */
 304         mtip_enable_fis(port, 0);
 305 }
 306
 307 /*
 308  * Initialize a port.
 309  *
 310  * This function deinitializes the port by calling mtip_deinit_port() and
 311  * then initializes it by setting the command header and RX FIS addresses,
 312  * clearing the SError register and any pending port interrupts before
 313  * re-enabling the default set of port interrupts.
 314  *
 315  * @port Pointer to the port structure.
 316  *
 317  * return value
 318  *      None
 319  */
 320 static void mtip_init_port(struct mtip_port *port)
 321 {
 322         int i;
 323         mtip_deinit_port(port);
 324
 325         /* Program the command list base and FIS base addresses */
 326         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 327                 writel((port->command_list_dma >> 16) >> 16,
 328                          port->mmio + PORT_LST_ADDR_HI);
 329                 writel((port->rxfis_dma >> 16) >> 16,
 330                          port->mmio + PORT_FIS_ADDR_HI);
 331                 set_bit(MTIP_PF_HOST_CAP_64, &port->flags);
 332         }
 333
 334         writel(port->command_list_dma & 0xFFFFFFFF,
 335                         port->mmio + PORT_LST_ADDR);
 336         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 337
 338         /* Clear SError */
 339         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 340
 341         /* reset the completed registers.*/
 342         for (i = 0; i < port->dd->slot_groups; i++)
 343                 writel(0xFFFFFFFF, port->completed[i]);
 344
 345         /* Clear any pending interrupts for this port */
 346         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 347
 348         /* Clear any pending interrupts on the HBA. */
 349         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 350                                         port->dd->mmio + HOST_IRQ_STAT);
 351
 352         /* Enable port interrupts */
 353         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 354 }
 355
 356 /*
 357  * Restart a port
 358  *
 359  * @port Pointer to the port data structure.
 360  *
 361  * return value
 362  *      None
 363  */
 364 static void mtip_restart_port(struct mtip_port *port)
 365 {
 366         unsigned long timeout;
 367
 368         /* Disable the DMA engine */
 369         mtip_enable_engine(port, 0);
 370
 371         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 372         timeout = jiffies + msecs_to_jiffies(500);
 373         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 374                  && time_before(jiffies, timeout))
 375                 ;
 376
 377         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 378                 return;
 379
 380         /*
 381          * Chip quirk: escalate to hba reset if
 382          * PxCMD.CR not clear after 500 ms
 383          */
 384         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 385                 dev_warn(&port->dd->pdev->dev,
 386                         "PxCMD.CR not clear, escalating reset\n");
 387
 388                 if (mtip_hba_reset(port->dd))
 389                         dev_err(&port->dd->pdev->dev,
 390                                 "HBA reset escalation failed.\n");
 391
 392                 /* 30 ms delay before com reset to quiesce chip */
 393                 mdelay(30);
 394         }
 395
 396         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 397
 398         /* Set PxSCTL.DET */
 399         writel(readl(port->mmio + PORT_SCR_CTL) |
 400                          1, port->mmio + PORT_SCR_CTL);
 401         readl(port->mmio + PORT_SCR_CTL);
 402
 403         /* Wait 1 ms to quiesce chip function */
 404         timeout = jiffies + msecs_to_jiffies(1);
 405         while (time_before(jiffies, timeout))
 406                 ;
 407
 408         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 409                 return;
 410
 411         /* Clear PxSCTL.DET */
 412         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 413                          port->mmio + PORT_SCR_CTL);
 414         readl(port->mmio + PORT_SCR_CTL);
 415
 416         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 417         timeout = jiffies + msecs_to_jiffies(500);
 418         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 419                          && time_before(jiffies, timeout))
 420                 ;
 421
 422         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 423                 return;
 424
 425         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 426                 dev_warn(&port->dd->pdev->dev,
 427                         "COM reset failed\n");
 428
 429         mtip_init_port(port);
 430         mtip_start_port(port);
 431
 432 }
 433
 434 static int mtip_device_reset(struct driver_data *dd)
 435 {
 436         int rv = 0;
 437
 438         if (mtip_check_surprise_removal(dd))
 439                 return 0;
 440
 441         if (mtip_hba_reset(dd) < 0)
 442                 rv = -EFAULT;
 443
 444         mdelay(1);
 445         mtip_init_port(dd->port);
 446         mtip_start_port(dd->port);
 447
 448         /* Enable interrupts on the HBA. */
 449         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 450                                         dd->mmio + HOST_CTL);
 451         return rv;
 452 }
 453
 454 /*
 455  * Helper function for tag logging
 456  */
 457 static void print_tags(struct driver_data *dd,
 458                         char *msg,
 459                         unsigned long *tagbits,
 460                         int cnt)
 461 {
 462         unsigned char tagmap[128];
 463         int group, tagmap_len = 0;
 464
 465         memset(tagmap, 0, sizeof(tagmap));
 466         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 467                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 468                                                 tagbits[group-1]);
 469         dev_warn(&dd->pdev->dev,
 470                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 471 }
 472
 473 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 474                                 dma_addr_t buffer_dma, unsigned int sectors);
 475 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 476                                                 struct smart_attr *attrib);
 477
 478 static void mtip_complete_command(struct mtip_cmd *cmd, blk_status_t status)
 479 {
 480         struct request *req = blk_mq_rq_from_pdu(cmd);
 481
 482         cmd->status = status;
 483         if (likely(!blk_should_fake_timeout(req->q)))
 484                 blk_mq_complete_request(req);
 485 }
 486
 487 /*
 488  * Handle an error.
 489  *
 490  * @dd Pointer to the DRIVER_DATA structure.
 491  *
 492  * return value
 493  *      None
 494  */
 495 static void mtip_handle_tfe(struct driver_data *dd)
 496 {
 497         int group, tag, bit, reissue, rv;
 498         struct mtip_port *port;
 499         struct mtip_cmd  *cmd;
 500         u32 completed;
 501         struct host_to_dev_fis *fis;
 502         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 503         unsigned int cmd_cnt = 0;
 504         unsigned char *buf;
 505         char *fail_reason = NULL;
 506         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 507
 508         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 509
 510         port = dd->port;
 511
 512         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 513                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 514                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 515                 mtip_complete_command(cmd, BLK_STS_IOERR);
 516                 return;
 517         }
 518
 519         /* clear the tag accumulator */
 520         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 521
 522         /* Loop through all the groups */
 523         for (group = 0; group < dd->slot_groups; group++) {
 524                 completed = readl(port->completed[group]);
 525
 526                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 527
 528                 /* clear completed status register in the hardware.*/
 529                 writel(completed, port->completed[group]);
 530
 531                 /* Process successfully completed commands */
 532                 for (bit = 0; bit < 32 && completed; bit++) {
 533                         if (!(completed & (1<<bit)))
 534                                 continue;
 535                         tag = (group << 5) + bit;
 536
 537                         /* Skip the internal command slot */
 538                         if (tag == MTIP_TAG_INTERNAL)
 539                                 continue;
 540
 541                         cmd = mtip_cmd_from_tag(dd, tag);
 542                         mtip_complete_command(cmd, 0);
 543                         set_bit(tag, tagaccum);
 544                         cmd_cnt++;
 545                 }
 546         }
 547
 548         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 549
 550         /* Restart the port */
 551         mdelay(20);
 552         mtip_restart_port(port);
 553
 554         /* Trying to determine the cause of the error */
 555         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 556                                 dd->port->log_buf,
 557                                 dd->port->log_buf_dma, 1);
 558         if (rv) {
 559                 dev_warn(&dd->pdev->dev,
 560                         "Error in READ LOG EXT (10h) command\n");
 561                 /* non-critical error, don't fail the load */
 562         } else {
 563                 buf = (unsigned char *)dd->port->log_buf;
 564                 if (buf[259] & 0x1) {
 565                         dev_info(&dd->pdev->dev,
 566                                 "Write protect bit is set.\n");
 567                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 568                         fail_all_ncq_write = 1;
 569                         fail_reason = "write protect";
 570                 }
 571                 if (buf[288] == 0xF7) {
 572                         dev_info(&dd->pdev->dev,
 573                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 574                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 575                         fail_all_ncq_cmds = 1;
 576                         fail_reason = "thermal shutdown";
 577                 }
 578                 if (buf[288] == 0xBF) {
 579                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 580                         dev_info(&dd->pdev->dev,
 581                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 582                         fail_all_ncq_cmds = 1;
 583                         fail_reason = "rebuild failed";
 584                 }
 585         }
 586
 587         /* clear the tag accumulator */
 588         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 589
 590         /* Loop through all the groups */
 591         for (group = 0; group < dd->slot_groups; group++) {
 592                 for (bit = 0; bit < 32; bit++) {
 593                         reissue = 1;
 594                         tag = (group << 5) + bit;
 595                         cmd = mtip_cmd_from_tag(dd, tag);
 596
 597                         fis = (struct host_to_dev_fis *)cmd->command;
 598
 599                         /* Should re-issue? */
 600                         if (tag == MTIP_TAG_INTERNAL ||
 601                             fis->command == ATA_CMD_SET_FEATURES)
 602                                 reissue = 0;
 603                         else {
 604                                 if (fail_all_ncq_cmds ||
 605                                         (fail_all_ncq_write &&
 606                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 607                                         dev_warn(&dd->pdev->dev,
 608                                         "  Fail: %s w/tag %d [%s].\n",
 609                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 610                                                 "write" : "read",
 611                                         tag,
 612                                         fail_reason != NULL ?
 613                                                 fail_reason : "unknown");
 614                                         mtip_complete_command(cmd, BLK_STS_MEDIUM);
 615                                         continue;
 616                                 }
 617                         }
 618
 619                         /*
 620                          * First check if this command has
 621                          *  exceeded its retries.
 622                          */
 623                         if (reissue && (cmd->retries-- > 0)) {
 624
 625                                 set_bit(tag, tagaccum);
 626
 627                                 /* Re-issue the command. */
 628                                 mtip_issue_ncq_command(port, tag);
 629
 630                                 continue;
 631                         }
 632
 633                         /* Retire a command that will not be reissued */
 634                         dev_warn(&port->dd->pdev->dev,
 635                                 "retiring tag %d\n", tag);
 636
 637                         mtip_complete_command(cmd, BLK_STS_IOERR);
 638                 }
 639         }
 640         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 641 }
 642
 643 /*
 644  * Handle a set device bits interrupt
 645  */
 646 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 647                                                         u32 completed)
 648 {
 649         struct driver_data *dd = port->dd;
 650         int tag, bit;
 651         struct mtip_cmd *command;
 652
 653         if (!completed) {
 654                 WARN_ON_ONCE(!completed);
 655                 return;
 656         }
 657         /* clear completed status register in the hardware.*/
 658         writel(completed, port->completed[group]);
 659
 660         /* Process completed commands. */
 661         for (bit = 0; (bit < 32) && completed; bit++) {
 662                 if (completed & 0x01) {
 663                         tag = (group << 5) | bit;
 664
 665                         /* skip internal command slot. */
 666                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 667                                 continue;
 668
 669                         command = mtip_cmd_from_tag(dd, tag);
 670                         mtip_complete_command(command, 0);
 671                 }
 672                 completed >>= 1;
 673         }
 674
 675         /* If last, re-enable interrupts */
 676         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 677                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 678 }
 679
 680 /*
 681  * Process legacy pio and d2h interrupts
 682  */
 683 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 684 {
 685         struct mtip_port *port = dd->port;
 686         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 687
 688         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) && cmd) {
 689                 int group = MTIP_TAG_INDEX(MTIP_TAG_INTERNAL);
 690                 int status = readl(port->cmd_issue[group]);
 691
 692                 if (!(status & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))))
 693                         mtip_complete_command(cmd, 0);
 694         }
 695 }
 696
 697 /*
 698  * Demux and handle errors
 699  */
 700 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 701 {
 702         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 703                 dev_warn(&dd->pdev->dev,
 704                         "Clearing PxSERR.DIAG.x\n");
 705                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 706         }
 707
 708         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 709                 dev_warn(&dd->pdev->dev,
 710                         "Clearing PxSERR.DIAG.n\n");
 711                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 712         }
 713
 714         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 715                 dev_warn(&dd->pdev->dev,
 716                         "Port stat errors %x unhandled\n",
 717                         (port_stat & ~PORT_IRQ_HANDLED));
 718                 if (mtip_check_surprise_removal(dd))
 719                         return;
 720         }
 721         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 722                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 723                 wake_up_interruptible(&dd->port->svc_wait);
 724         }
 725 }
 726
 727 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 728 {
 729         struct driver_data *dd = (struct driver_data *) data;
 730         struct mtip_port *port = dd->port;
 731         u32 hba_stat, port_stat;
 732         int rv = IRQ_NONE;
 733         int do_irq_enable = 1, i, workers;
 734         struct mtip_work *twork;
 735
 736         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 737         if (hba_stat) {
 738                 rv = IRQ_HANDLED;
 739
 740                 /* Acknowledge the interrupt status on the port.*/
 741                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 742                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 743                         mtip_check_surprise_removal(dd);
 744                         return IRQ_HANDLED;
 745                 }
 746                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 747
 748                 /* Demux port status */
 749                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 750                         do_irq_enable = 0;
 751                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 752
 753                         /* Start at 1: group zero is always local? */
 754                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 755                                                                         i++) {
 756                                 twork = &dd->work[i];
 757                                 twork->completed = readl(port->completed[i]);
 758                                 if (twork->completed)
 759                                         workers++;
 760                         }
 761
 762                         atomic_set(&dd->irq_workers_active, workers);
 763                         if (workers) {
 764                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 765                                         twork = &dd->work[i];
 766                                         if (twork->completed)
 767                                                 queue_work_on(
 768                                                         twork->cpu_binding,
 769                                                         dd->isr_workq,
 770                                                         &twork->work);
 771                                 }
 772
 773                                 if (likely(dd->work[0].completed))
 774                                         mtip_workq_sdbfx(port, 0,
 775                                                         dd->work[0].completed);
 776
 777                         } else {
 778                                 /*
 779                                  * Chip quirk: SDB interrupt but nothing
 780                                  * to complete
 781                                  */
 782                                 do_irq_enable = 1;
 783                         }
 784                 }
 785
 786                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 787                         if (unlikely(mtip_check_surprise_removal(dd))) {
 788                                 /* don't proceed further */
 789                                 return IRQ_HANDLED;
 790                         }
 791                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 792                                                         &dd->dd_flag))
 793                                 return rv;
 794
 795                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 796                 }
 797
 798                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 799                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 800         }
 801
 802         /* acknowledge interrupt */
 803         if (unlikely(do_irq_enable))
 804                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 805
 806         return rv;
 807 }
 808
 809 /*
 810  * HBA interrupt subroutine.
 811  *
 812  * @irq         IRQ number.
 813  * @instance    Pointer to the driver data structure.
 814  *
 815  * return value
 816  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 817  *      IRQ_NONE        This interrupt was not for the HBA.
 818  */
 819 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 820 {
 821         struct driver_data *dd = instance;
 822
 823         return mtip_handle_irq(dd);
 824 }
 825
 826 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 827 {
 828         writel(1 << MTIP_TAG_BIT(tag), port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 829 }
 830
 831 static bool mtip_pause_ncq(struct mtip_port *port,
 832                                 struct host_to_dev_fis *fis)
 833 {
 834         unsigned long task_file_data;
 835
 836         task_file_data = readl(port->mmio+PORT_TFDATA);
 837         if ((task_file_data & 1))
 838                 return false;
 839
 840         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 841                 port->ic_pause_timer = jiffies;
 842                 return true;
 843         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 844                                         (fis->features == 0x03)) {
 845                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 846                 port->ic_pause_timer = jiffies;
 847                 return true;
 848         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
 849                 ((fis->command == 0xFC) &&
 850                         (fis->features == 0x27 || fis->features == 0x72 ||
 851                          fis->features == 0x62 || fis->features == 0x26))) {
 852                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
 853                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
 854                 /* Com reset after secure erase or lowlevel format */
 855                 mtip_restart_port(port);
 856                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 857                 return false;
 858         }
 859
 860         return false;
 861 }
 862
 863 static bool mtip_commands_active(struct mtip_port *port)
 864 {
 865         unsigned int active;
 866         unsigned int n;
 867
 868         /*
 869          * Ignore s_active bit 0 of array element 0.
 870          * This bit will always be set
 871          */
 872         active = readl(port->s_active[0]) & 0xFFFFFFFE;
 873         for (n = 1; n < port->dd->slot_groups; n++)
 874                 active |= readl(port->s_active[n]);
 875
 876         return active != 0;
 877 }
 878
 879 /*
 880  * Wait for port to quiesce
 881  *
 882  * @port    Pointer to port data structure
 883  * @timeout Max duration to wait (ms)
 884  *
 885  * return value
 886  *      0       Success
 887  *      -EBUSY  Commands still active
 888  */
 889 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 890 {
 891         unsigned long to;
 892         bool active = true;
 893
 894         blk_mq_quiesce_queue(port->dd->queue);
 895
 896         to = jiffies + msecs_to_jiffies(timeout);
 897         do {
 898                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
 899                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
 900                         msleep(20);
 901                         continue; /* svc thd is actively issuing commands */
 902                 }
 903
 904                 msleep(100);
 905
 906                 if (mtip_check_surprise_removal(port->dd))
 907                         goto err_fault;
 908
 909                 active = mtip_commands_active(port);
 910                 if (!active)
 911                         break;
 912         } while (time_before(jiffies, to));
 913
 914         blk_mq_unquiesce_queue(port->dd->queue);
 915         return active ? -EBUSY : 0;
 916 err_fault:
 917         blk_mq_unquiesce_queue(port->dd->queue);
 918         return -EFAULT;
 919 }
 920
 921 struct mtip_int_cmd {
 922         int fis_len;
 923         dma_addr_t buffer;
 924         int buf_len;
 925         u32 opts;
 926 };
 927
 928 /*
 929  * Execute an internal command and wait for the completion.
 930  *
 931  * @port    Pointer to the port data structure.
 932  * @fis     Pointer to the FIS that describes the command.
 933  * @fis_len  Length in WORDS of the FIS.
 934  * @buffer  DMA accessible for command data.
 935  * @buf_len  Length, in bytes, of the data buffer.
 936  * @opts    Command header options, excluding the FIS length
 937  *             and the number of PRD entries.
 938  * @timeout Time in ms to wait for the command to complete.
 939  *
 940  * return value
 941  *      0        Command completed successfully.
 942  *      -EFAULT  The buffer address is not correctly aligned.
 943  *      -EBUSY   Internal command or other IO in progress.
 944  *      -EAGAIN  Time out waiting for command to complete.
 945  */
 946 static int mtip_exec_internal_command(struct mtip_port *port,
 947                                         struct host_to_dev_fis *fis,
 948                                         int fis_len,
 949                                         dma_addr_t buffer,
 950                                         int buf_len,
 951                                         u32 opts,
 952                                         unsigned long timeout)
 953 {
 954         struct mtip_cmd *int_cmd;
 955         struct driver_data *dd = port->dd;
 956         struct request *rq;
 957         struct mtip_int_cmd icmd = {
 958                 .fis_len = fis_len,
 959                 .buffer = buffer,
 960                 .buf_len = buf_len,
 961                 .opts = opts
 962         };
 963         int rv = 0;
 964
 965         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
 966         if (buffer & 0x00000007) {
 967                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
 968                 return -EFAULT;
 969         }
 970
 971         if (mtip_check_surprise_removal(dd))
 972                 return -EFAULT;
 973
 974         rq = blk_mq_alloc_request(dd->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED);
 975         if (IS_ERR(rq)) {
 976                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
 977                 return -EFAULT;
 978         }
 979
 980         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 981
 982         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
 983                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 984
 985         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 986
 987         if (fis->command != ATA_CMD_STANDBYNOW1) {
 988                 /* wait for io to complete if non atomic */
 989                 if (mtip_quiesce_io(port, MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
 990                         dev_warn(&dd->pdev->dev, "Failed to quiesce IO\n");
 991                         blk_mq_free_request(rq);
 992                         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 993                         wake_up_interruptible(&port->svc_wait);
 994                         return -EBUSY;
 995                 }
 996         }
 997
 998         /* Copy the command to the command table */
 999         int_cmd = blk_mq_rq_to_pdu(rq);
1000         int_cmd->icmd = &icmd;
1001         memcpy(int_cmd->command, fis, fis_len*4);
1002
1003         rq->timeout = timeout;
1004
1005         /* insert request and run queue */
1006         blk_execute_rq(rq, true);
1007
1008         if (int_cmd->status) {
1009                 dev_err(&dd->pdev->dev, "Internal command [%02X] failed %d\n",
1010                                 fis->command, int_cmd->status);
1011                 rv = -EIO;
1012
1013                 if (mtip_check_surprise_removal(dd) ||
1014                         test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1015                                         &dd->dd_flag)) {
1016                         dev_err(&dd->pdev->dev,
1017                                 "Internal command [%02X] wait returned due to SR\n",
1018                                 fis->command);
1019                         rv = -ENXIO;
1020                         goto exec_ic_exit;
1021                 }
1022                 mtip_device_reset(dd); /* recover from timeout issue */
1023                 rv = -EAGAIN;
1024                 goto exec_ic_exit;
1025         }
1026
1027         if (readl(port->cmd_issue[MTIP_TAG_INDEX(MTIP_TAG_INTERNAL)])
1028                         & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))) {
1029                 rv = -ENXIO;
1030                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1031                         mtip_device_reset(dd);
1032                         rv = -EAGAIN;
1033                 }
1034         }
1035 exec_ic_exit:
1036         /* Clear the allocated and active bits for the internal command. */
1037         blk_mq_free_request(rq);
1038         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1039         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1040                 /* NCQ paused */
1041                 return rv;
1042         }
1043         wake_up_interruptible(&port->svc_wait);
1044
1045         return rv;
1046 }
1047
1048 /*
1049  * Byte-swap ATA ID strings.
1050  *
1051  * ATA identify data contains strings in byte-swapped 16-bit words.
1052  * They must be swapped (on all architectures) to be usable as C strings.
1053  * This function swaps bytes in-place.
1054  *
1055  * @buf The buffer location of the string
1056  * @len The number of bytes to swap
1057  *
1058  * return value
1059  *      None
1060  */
1061 static inline void ata_swap_string(u16 *buf, unsigned int len)
1062 {
1063         int i;
1064         for (i = 0; i < (len/2); i++)
1065                 be16_to_cpus(&buf[i]);
1066 }
1067
1068 static void mtip_set_timeout(struct driver_data *dd,
1069                                         struct host_to_dev_fis *fis,
1070                                         unsigned int *timeout, u8 erasemode)
1071 {
1072         switch (fis->command) {
1073         case ATA_CMD_DOWNLOAD_MICRO:
1074                 *timeout = 120000; /* 2 minutes */
1075                 break;
1076         case ATA_CMD_SEC_ERASE_UNIT:
1077         case 0xFC:
1078                 if (erasemode)
1079                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1080                 else
1081                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1082                 break;
1083         case ATA_CMD_STANDBYNOW1:
1084                 *timeout = 120000;  /* 2 minutes */
1085                 break;
1086         case 0xF7:
1087         case 0xFA:
1088                 *timeout = 60000;  /* 60 seconds */
1089                 break;
1090         case ATA_CMD_SMART:
1091                 *timeout = 15000;  /* 15 seconds */
1092                 break;
1093         default:
1094                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1095                 break;
1096         }
1097 }
1098
1099 /*
1100  * Request the device identity information.
1101  *
1102  * If a user space buffer is not specified, i.e. is NULL, the
1103  * identify information is still read from the drive and placed
1104  * into the identify data buffer (@e port->identify) in the
1105  * port data structure.
1106  * When the identify buffer contains valid identify information @e
1107  * port->identify_valid is non-zero.
1108  *
1109  * @port         Pointer to the port structure.
1110  * @user_buffer  A user space buffer where the identify data should be
1111  *                    copied.
1112  *
1113  * return value
1114  *      0       Command completed successfully.
1115  *      -EFAULT An error occurred while coping data to the user buffer.
1116  *      -1      Command failed.
1117  */
1118 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1119 {
1120         int rv = 0;
1121         struct host_to_dev_fis fis;
1122
1123         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1124                 return -EFAULT;
1125
1126         /* Build the FIS. */
1127         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1128         fis.type        = 0x27;
1129         fis.opts        = 1 << 7;
1130         fis.command     = ATA_CMD_ID_ATA;
1131
1132         /* Set the identify information as invalid. */
1133         port->identify_valid = 0;
1134
1135         /* Clear the identify information. */
1136         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1137
1138         /* Execute the command. */
1139         if (mtip_exec_internal_command(port,
1140                                 &fis,
1141                                 5,
1142                                 port->identify_dma,
1143                                 sizeof(u16) * ATA_ID_WORDS,
1144                                 0,
1145                                 MTIP_INT_CMD_TIMEOUT_MS)
1146                                 < 0) {
1147                 rv = -1;
1148                 goto out;
1149         }
1150
1151         /*
1152          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1153          * perform field-sensitive swapping on the string fields.
1154          * See the kernel use of ata_id_string() for proof of this.
1155          */
1156 #ifdef __LITTLE_ENDIAN
1157         ata_swap_string(port->identify + 27, 40);  /* model string*/
1158         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1159         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1160 #else
1161         {
1162                 int i;
1163                 for (i = 0; i < ATA_ID_WORDS; i++)
1164                         port->identify[i] = le16_to_cpu(port->identify[i]);
1165         }
1166 #endif
1167
1168         /* Check security locked state */
1169         if (port->identify[128] & 0x4)
1170                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1171         else
1172                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1173
1174         /* Set the identify buffer as valid. */
1175         port->identify_valid = 1;
1176
1177         if (user_buffer) {
1178                 if (copy_to_user(
1179                         user_buffer,
1180                         port->identify,
1181                         ATA_ID_WORDS * sizeof(u16))) {
1182                         rv = -EFAULT;
1183                         goto out;
1184                 }
1185         }
1186
1187 out:
1188         return rv;
1189 }
1190
1191 /*
1192  * Issue a standby immediate command to the device.
1193  *
1194  * @port Pointer to the port structure.
1195  *
1196  * return value
1197  *      0       Command was executed successfully.
1198  *      -1      An error occurred while executing the command.
1199  */
1200 static int mtip_standby_immediate(struct mtip_port *port)
1201 {
1202         int rv;
1203         struct host_to_dev_fis  fis;
1204         unsigned long __maybe_unused start;
1205         unsigned int timeout;
1206
1207         /* Build the FIS. */
1208         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1209         fis.type        = 0x27;
1210         fis.opts        = 1 << 7;
1211         fis.command     = ATA_CMD_STANDBYNOW1;
1212
1213         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1214
1215         start = jiffies;
1216         rv = mtip_exec_internal_command(port,
1217                                         &fis,
1218                                         5,
1219                                         0,
1220                                         0,
1221                                         0,
1222                                         timeout);
1223         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1224                         jiffies_to_msecs(jiffies - start));
1225         if (rv)
1226                 dev_warn(&port->dd->pdev->dev,
1227                         "STANDBY IMMEDIATE command failed.\n");
1228
1229         return rv;
1230 }
1231
1232 /*
1233  * Issue a READ LOG EXT command to the device.
1234  *
1235  * @port        pointer to the port structure.
1236  * @page        page number to fetch
1237  * @buffer      pointer to buffer
1238  * @buffer_dma  dma address corresponding to @buffer
1239  * @sectors     page length to fetch, in sectors
1240  *
1241  * return value
1242  *      @rv     return value from mtip_exec_internal_command()
1243  */
1244 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1245                                 dma_addr_t buffer_dma, unsigned int sectors)
1246 {
1247         struct host_to_dev_fis fis;
1248
1249         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1250         fis.type        = 0x27;
1251         fis.opts        = 1 << 7;
1252         fis.command     = ATA_CMD_READ_LOG_EXT;
1253         fis.sect_count  = sectors & 0xFF;
1254         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1255         fis.lba_low     = page;
1256         fis.lba_mid     = 0;
1257         fis.device      = ATA_DEVICE_OBS;
1258
1259         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1260
1261         return mtip_exec_internal_command(port,
1262                                         &fis,
1263                                         5,
1264                                         buffer_dma,
1265                                         sectors * ATA_SECT_SIZE,
1266                                         0,
1267                                         MTIP_INT_CMD_TIMEOUT_MS);
1268 }
1269
1270 /*
1271  * Issue a SMART READ DATA command to the device.
1272  *
1273  * @port        pointer to the port structure.
1274  * @buffer      pointer to buffer
1275  * @buffer_dma  dma address corresponding to @buffer
1276  *
1277  * return value
1278  *      @rv     return value from mtip_exec_internal_command()
1279  */
1280 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1281                                         dma_addr_t buffer_dma)
1282 {
1283         struct host_to_dev_fis fis;
1284
1285         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1286         fis.type        = 0x27;
1287         fis.opts        = 1 << 7;
1288         fis.command     = ATA_CMD_SMART;
1289         fis.features    = 0xD0;
1290         fis.sect_count  = 1;
1291         fis.lba_mid     = 0x4F;
1292         fis.lba_hi      = 0xC2;
1293         fis.device      = ATA_DEVICE_OBS;
1294
1295         return mtip_exec_internal_command(port,
1296                                         &fis,
1297                                         5,
1298                                         buffer_dma,
1299                                         ATA_SECT_SIZE,
1300                                         0,
1301                                         15000);
1302 }
1303
1304 /*
1305  * Get the value of a smart attribute
1306  *
1307  * @port        pointer to the port structure
1308  * @id          attribute number
1309  * @attrib      pointer to return attrib information corresponding to @id
1310  *
1311  * return value
1312  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1313  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1314  */
1315 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1316                                                 struct smart_attr *attrib)
1317 {
1318         int rv, i;
1319         struct smart_attr *pattr;
1320
1321         if (!attrib)
1322                 return -EINVAL;
1323
1324         if (!port->identify_valid) {
1325                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1326                 return -EPERM;
1327         }
1328         if (!(port->identify[82] & 0x1)) {
1329                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1330                 return -EPERM;
1331         }
1332         if (!(port->identify[85] & 0x1)) {
1333                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1334                 return -EPERM;
1335         }
1336
1337         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1338         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1339         if (rv) {
1340                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1341                 return rv;
1342         }
1343
1344         pattr = (struct smart_attr *)(port->smart_buf + 2);
1345         for (i = 0; i < 29; i++, pattr++)
1346                 if (pattr->attr_id == id) {
1347                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1348                         break;
1349                 }
1350
1351         if (i == 29) {
1352                 dev_warn(&port->dd->pdev->dev,
1353                         "Query for invalid SMART attribute ID\n");
1354                 rv = -EINVAL;
1355         }
1356
1357         return rv;
1358 }
1359
1360 /*
1361  * Get the drive capacity.
1362  *
1363  * @dd      Pointer to the device data structure.
1364  * @sectors Pointer to the variable that will receive the sector count.
1365  *
1366  * return value
1367  *      1 Capacity was returned successfully.
1368  *      0 The identify information is invalid.
1369  */
1370 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1371 {
1372         struct mtip_port *port = dd->port;
1373         u64 total, raw0, raw1, raw2, raw3;
1374         raw0 = port->identify[100];
1375         raw1 = port->identify[101];
1376         raw2 = port->identify[102];
1377         raw3 = port->identify[103];
1378         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1379         *sectors = total;
1380         return (bool) !!port->identify_valid;
1381 }
1382
1383 /*
1384  * Display the identify command data.
1385  *
1386  * @port Pointer to the port data structure.
1387  *
1388  * return value
1389  *      None
1390  */
1391 static void mtip_dump_identify(struct mtip_port *port)
1392 {
1393         sector_t sectors;
1394         unsigned short revid;
1395         char cbuf[42];
1396
1397         if (!port->identify_valid)
1398                 return;
1399
1400         strscpy(cbuf, (char *)(port->identify + 10), 21);
1401         dev_info(&port->dd->pdev->dev,
1402                 "Serial No.: %s\n", cbuf);
1403
1404         strscpy(cbuf, (char *)(port->identify + 23), 9);
1405         dev_info(&port->dd->pdev->dev,
1406                 "Firmware Ver.: %s\n", cbuf);
1407
1408         strscpy(cbuf, (char *)(port->identify + 27), 41);
1409         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1410
1411         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1412                 port->identify[128],
1413                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1414
1415         if (mtip_hw_get_capacity(port->dd, &sectors))
1416                 dev_info(&port->dd->pdev->dev,
1417                         "Capacity: %llu sectors (%llu MB)\n",
1418                          (u64)sectors,
1419                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1420
1421         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1422         switch (revid & 0xFF) {
1423         case 0x1:
1424                 strscpy(cbuf, "A0", 3);
1425                 break;
1426         case 0x3:
1427                 strscpy(cbuf, "A2", 3);
1428                 break;
1429         default:
1430                 strscpy(cbuf, "?", 2);
1431                 break;
1432         }
1433         dev_info(&port->dd->pdev->dev,
1434                 "Card Type: %s\n", cbuf);
1435 }
1436
1437 /*
1438  * Map the commands scatter list into the command table.
1439  *
1440  * @command Pointer to the command.
1441  * @nents Number of scatter list entries.
1442  *
1443  * return value
1444  *      None
1445  */
1446 static inline void fill_command_sg(struct driver_data *dd,
1447                                 struct mtip_cmd *command,
1448                                 int nents)
1449 {
1450         int n;
1451         unsigned int dma_len;
1452         struct mtip_cmd_sg *command_sg;
1453         struct scatterlist *sg;
1454
1455         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1456
1457         for_each_sg(command->sg, sg, nents, n) {
1458                 dma_len = sg_dma_len(sg);
1459                 if (dma_len > 0x400000)
1460                         dev_err(&dd->pdev->dev,
1461                                 "DMA segment length truncated\n");
1462                 command_sg->info = cpu_to_le32((dma_len-1) & 0x3FFFFF);
1463                 command_sg->dba =  cpu_to_le32(sg_dma_address(sg));
1464                 command_sg->dba_upper =
1465                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1466                 command_sg++;
1467         }
1468 }
1469
1470 /*
1471  * @brief Execute a drive command.
1472  *
1473  * return value 0 The command completed successfully.
1474  * return value -1 An error occurred while executing the command.
1475  */
1476 static int exec_drive_task(struct mtip_port *port, u8 *command)
1477 {
1478         struct host_to_dev_fis  fis;
1479         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1480         unsigned int to;
1481
1482         /* Build the FIS. */
1483         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1484         fis.type        = 0x27;
1485         fis.opts        = 1 << 7;
1486         fis.command     = command[0];
1487         fis.features    = command[1];
1488         fis.sect_count  = command[2];
1489         fis.sector      = command[3];
1490         fis.cyl_low     = command[4];
1491         fis.cyl_hi      = command[5];
1492         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1493
1494         mtip_set_timeout(port->dd, &fis, &to, 0);
1495
1496         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1497                 __func__,
1498                 command[0],
1499                 command[1],
1500                 command[2],
1501                 command[3],
1502                 command[4],
1503                 command[5],
1504                 command[6]);
1505
1506         /* Execute the command. */
1507         if (mtip_exec_internal_command(port,
1508                                  &fis,
1509                                  5,
1510                                  0,
1511                                  0,
1512                                  0,
1513                                  to) < 0) {
1514                 return -1;
1515         }
1516
1517         command[0] = reply->command; /* Status*/
1518         command[1] = reply->features; /* Error*/
1519         command[4] = reply->cyl_low;
1520         command[5] = reply->cyl_hi;
1521
1522         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1523                 __func__,
1524                 command[0],
1525                 command[1],
1526                 command[4],
1527                 command[5]);
1528
1529         return 0;
1530 }
1531
1532 /*
1533  * @brief Execute a drive command.
1534  *
1535  * @param port Pointer to the port data structure.
1536  * @param command Pointer to the user specified command parameters.
1537  * @param user_buffer Pointer to the user space buffer where read sector
1538  *                   data should be copied.
1539  *
1540  * return value 0 The command completed successfully.
1541  * return value -EFAULT An error occurred while copying the completion
1542  *                 data to the user space buffer.
1543  * return value -1 An error occurred while executing the command.
1544  */
1545 static int exec_drive_command(struct mtip_port *port, u8 *command,
1546                                 void __user *user_buffer)
1547 {
1548         struct host_to_dev_fis  fis;
1549         struct host_to_dev_fis *reply;
1550         u8 *buf = NULL;
1551         dma_addr_t dma_addr = 0;
1552         int rv = 0, xfer_sz = command[3];
1553         unsigned int to;
1554
1555         if (xfer_sz) {
1556                 if (!user_buffer)
1557                         return -EFAULT;
1558
1559                 buf = dma_alloc_coherent(&port->dd->pdev->dev,
1560                                 ATA_SECT_SIZE * xfer_sz,
1561                                 &dma_addr,
1562                                 GFP_KERNEL);
1563                 if (!buf) {
1564                         dev_err(&port->dd->pdev->dev,
1565                                 "Memory allocation failed (%d bytes)\n",
1566                                 ATA_SECT_SIZE * xfer_sz);
1567                         return -ENOMEM;
1568                 }
1569         }
1570
1571         /* Build the FIS. */
1572         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1573         fis.type        = 0x27;
1574         fis.opts        = 1 << 7;
1575         fis.command     = command[0];
1576         fis.features    = command[2];
1577         fis.sect_count  = command[3];
1578         if (fis.command == ATA_CMD_SMART) {
1579                 fis.sector      = command[1];
1580                 fis.cyl_low     = 0x4F;
1581                 fis.cyl_hi      = 0xC2;
1582         }
1583
1584         mtip_set_timeout(port->dd, &fis, &to, 0);
1585
1586         if (xfer_sz)
1587                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1588         else
1589                 reply = (port->rxfis + RX_FIS_D2H_REG);
1590
1591         dbg_printk(MTIP_DRV_NAME
1592                 " %s: User Command: cmd %x, sect %x, "
1593                 "feat %x, sectcnt %x\n",
1594                 __func__,
1595                 command[0],
1596                 command[1],
1597                 command[2],
1598                 command[3]);
1599
1600         /* Execute the command. */
1601         if (mtip_exec_internal_command(port,
1602                                 &fis,
1603                                  5,
1604                                  (xfer_sz ? dma_addr : 0),
1605                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1606                                  0,
1607                                  to)
1608                                  < 0) {
1609                 rv = -EFAULT;
1610                 goto exit_drive_command;
1611         }
1612
1613         /* Collect the completion status. */
1614         command[0] = reply->command; /* Status*/
1615         command[1] = reply->features; /* Error*/
1616         command[2] = reply->sect_count;
1617
1618         dbg_printk(MTIP_DRV_NAME
1619                 " %s: Completion Status: stat %x, "
1620                 "err %x, nsect %x\n",
1621                 __func__,
1622                 command[0],
1623                 command[1],
1624                 command[2]);
1625
1626         if (xfer_sz) {
1627                 if (copy_to_user(user_buffer,
1628                                  buf,
1629                                  ATA_SECT_SIZE * command[3])) {
1630                         rv = -EFAULT;
1631                         goto exit_drive_command;
1632                 }
1633         }
1634 exit_drive_command:
1635         if (buf)
1636                 dma_free_coherent(&port->dd->pdev->dev,
1637                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1638         return rv;
1639 }
1640
1641 /*
1642  *  Indicates whether a command has a single sector payload.
1643  *
1644  *  @command passed to the device to perform the certain event.
1645  *  @features passed to the device to perform the certain event.
1646  *
1647  *  return value
1648  *      1       command is one that always has a single sector payload,
1649  *              regardless of the value in the Sector Count field.
1650  *      0       otherwise
1651  *
1652  */
1653 static unsigned int implicit_sector(unsigned char command,
1654                                     unsigned char features)
1655 {
1656         unsigned int rv = 0;
1657
1658         /* list of commands that have an implicit sector count of 1 */
1659         switch (command) {
1660         case ATA_CMD_SEC_SET_PASS:
1661         case ATA_CMD_SEC_UNLOCK:
1662         case ATA_CMD_SEC_ERASE_PREP:
1663         case ATA_CMD_SEC_ERASE_UNIT:
1664         case ATA_CMD_SEC_FREEZE_LOCK:
1665         case ATA_CMD_SEC_DISABLE_PASS:
1666         case ATA_CMD_PMP_READ:
1667         case ATA_CMD_PMP_WRITE:
1668                 rv = 1;
1669                 break;
1670         case ATA_CMD_SET_MAX:
1671                 if (features == ATA_SET_MAX_UNLOCK)
1672                         rv = 1;
1673                 break;
1674         case ATA_CMD_SMART:
1675                 if ((features == ATA_SMART_READ_VALUES) ||
1676                                 (features == ATA_SMART_READ_THRESHOLDS))
1677                         rv = 1;
1678                 break;
1679         case ATA_CMD_CONF_OVERLAY:
1680                 if ((features == ATA_DCO_IDENTIFY) ||
1681                                 (features == ATA_DCO_SET))
1682                         rv = 1;
1683                 break;
1684         }
1685         return rv;
1686 }
1687
1688 /*
1689  * Executes a taskfile
1690  * See ide_taskfile_ioctl() for derivation
1691  */
1692 static int exec_drive_taskfile(struct driver_data *dd,
1693                                void __user *buf,
1694                                ide_task_request_t *req_task,
1695                                int outtotal)
1696 {
1697         struct host_to_dev_fis  fis;
1698         struct host_to_dev_fis *reply;
1699         u8 *outbuf = NULL;
1700         u8 *inbuf = NULL;
1701         dma_addr_t outbuf_dma = 0;
1702         dma_addr_t inbuf_dma = 0;
1703         dma_addr_t dma_buffer = 0;
1704         int err = 0;
1705         unsigned int taskin = 0;
1706         unsigned int taskout = 0;
1707         u8 nsect = 0;
1708         unsigned int timeout;
1709         unsigned int force_single_sector;
1710         unsigned int transfer_size;
1711         unsigned long task_file_data;
1712         int intotal = outtotal + req_task->out_size;
1713         int erasemode = 0;
1714
1715         taskout = req_task->out_size;
1716         taskin = req_task->in_size;
1717         /* 130560 = 512 * 0xFF*/
1718         if (taskin > 130560 || taskout > 130560)
1719                 return -EINVAL;
1720
1721         if (taskout) {
1722                 outbuf = memdup_user(buf + outtotal, taskout);
1723                 if (IS_ERR(outbuf))
1724                         return PTR_ERR(outbuf);
1725
1726                 outbuf_dma = dma_map_single(&dd->pdev->dev, outbuf,
1727                                             taskout, DMA_TO_DEVICE);
1728                 if (dma_mapping_error(&dd->pdev->dev, outbuf_dma)) {
1729                         err = -ENOMEM;
1730                         goto abort;
1731                 }
1732                 dma_buffer = outbuf_dma;
1733         }
1734
1735         if (taskin) {
1736                 inbuf = memdup_user(buf + intotal, taskin);
1737                 if (IS_ERR(inbuf)) {
1738                         err = PTR_ERR(inbuf);
1739                         inbuf = NULL;
1740                         goto abort;
1741                 }
1742                 inbuf_dma = dma_map_single(&dd->pdev->dev, inbuf,
1743                                            taskin, DMA_FROM_DEVICE);
1744                 if (dma_mapping_error(&dd->pdev->dev, inbuf_dma)) {
1745                         err = -ENOMEM;
1746                         goto abort;
1747                 }
1748                 dma_buffer = inbuf_dma;
1749         }
1750
1751         /* only supports PIO and non-data commands from this ioctl. */
1752         switch (req_task->data_phase) {
1753         case TASKFILE_OUT:
1754                 nsect = taskout / ATA_SECT_SIZE;
1755                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1756                 break;
1757         case TASKFILE_IN:
1758                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1759                 break;
1760         case TASKFILE_NO_DATA:
1761                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1762                 break;
1763         default:
1764                 err = -EINVAL;
1765                 goto abort;
1766         }
1767
1768         /* Build the FIS. */
1769         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1770
1771         fis.type        = 0x27;
1772         fis.opts        = 1 << 7;
1773         fis.command     = req_task->io_ports[7];
1774         fis.features    = req_task->io_ports[1];
1775         fis.sect_count  = req_task->io_ports[2];
1776         fis.lba_low     = req_task->io_ports[3];
1777         fis.lba_mid     = req_task->io_ports[4];
1778         fis.lba_hi      = req_task->io_ports[5];
1779          /* Clear the dev bit*/
1780         fis.device      = req_task->io_ports[6] & ~0x10;
1781
1782         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1783                 req_task->in_flags.all  =
1784                         IDE_TASKFILE_STD_IN_FLAGS |
1785                         (IDE_HOB_STD_IN_FLAGS << 8);
1786                 fis.lba_low_ex          = req_task->hob_ports[3];
1787                 fis.lba_mid_ex          = req_task->hob_ports[4];
1788                 fis.lba_hi_ex           = req_task->hob_ports[5];
1789                 fis.features_ex         = req_task->hob_ports[1];
1790                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1791
1792         } else {
1793                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1794         }
1795
1796         force_single_sector = implicit_sector(fis.command, fis.features);
1797
1798         if ((taskin || taskout) && (!fis.sect_count)) {
1799                 if (nsect)
1800                         fis.sect_count = nsect;
1801                 else {
1802                         if (!force_single_sector) {
1803                                 dev_warn(&dd->pdev->dev,
1804                                         "data movement but "
1805                                         "sect_count is 0\n");
1806                                 err = -EINVAL;
1807                                 goto abort;
1808                         }
1809                 }
1810         }
1811
1812         dbg_printk(MTIP_DRV_NAME
1813                 " %s: cmd %x, feat %x, nsect %x,"
1814                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1815                 " head/dev %x\n",
1816                 __func__,
1817                 fis.command,
1818                 fis.features,
1819                 fis.sect_count,
1820                 fis.lba_low,
1821                 fis.lba_mid,
1822                 fis.lba_hi,
1823                 fis.device);
1824
1825         /* check for erase mode support during secure erase.*/
1826         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
1827                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
1828                 erasemode = 1;
1829         }
1830
1831         mtip_set_timeout(dd, &fis, &timeout, erasemode);
1832
1833         /* Determine the correct transfer size.*/
1834         if (force_single_sector)
1835                 transfer_size = ATA_SECT_SIZE;
1836         else
1837                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1838
1839         /* Execute the command.*/
1840         if (mtip_exec_internal_command(dd->port,
1841                                  &fis,
1842                                  5,
1843                                  dma_buffer,
1844                                  transfer_size,
1845                                  0,
1846                                  timeout) < 0) {
1847                 err = -EIO;
1848                 goto abort;
1849         }
1850
1851         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1852
1853         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1854                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1855                 req_task->io_ports[7] = reply->control;
1856         } else {
1857                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
1858                 req_task->io_ports[7] = reply->command;
1859         }
1860
1861         /* reclaim the DMA buffers.*/
1862         if (inbuf_dma)
1863                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1864                                  DMA_FROM_DEVICE);
1865         if (outbuf_dma)
1866                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1867                                  DMA_TO_DEVICE);
1868         inbuf_dma  = 0;
1869         outbuf_dma = 0;
1870
1871         /* return the ATA registers to the caller.*/
1872         req_task->io_ports[1] = reply->features;
1873         req_task->io_ports[2] = reply->sect_count;
1874         req_task->io_ports[3] = reply->lba_low;
1875         req_task->io_ports[4] = reply->lba_mid;
1876         req_task->io_ports[5] = reply->lba_hi;
1877         req_task->io_ports[6] = reply->device;
1878
1879         if (req_task->out_flags.all & 1)  {
1880
1881                 req_task->hob_ports[3] = reply->lba_low_ex;
1882                 req_task->hob_ports[4] = reply->lba_mid_ex;
1883                 req_task->hob_ports[5] = reply->lba_hi_ex;
1884                 req_task->hob_ports[1] = reply->features_ex;
1885                 req_task->hob_ports[2] = reply->sect_cnt_ex;
1886         }
1887         dbg_printk(MTIP_DRV_NAME
1888                 " %s: Completion: stat %x,"
1889                 "err %x, sect_cnt %x, lbalo %x,"
1890                 "lbamid %x, lbahi %x, dev %x\n",
1891                 __func__,
1892                 req_task->io_ports[7],
1893                 req_task->io_ports[1],
1894                 req_task->io_ports[2],
1895                 req_task->io_ports[3],
1896                 req_task->io_ports[4],
1897                 req_task->io_ports[5],
1898                 req_task->io_ports[6]);
1899
1900         if (taskout) {
1901                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
1902                         err = -EFAULT;
1903                         goto abort;
1904                 }
1905         }
1906         if (taskin) {
1907                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
1908                         err = -EFAULT;
1909                         goto abort;
1910                 }
1911         }
1912 abort:
1913         if (inbuf_dma)
1914                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1915                                  DMA_FROM_DEVICE);
1916         if (outbuf_dma)
1917                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1918                                  DMA_TO_DEVICE);
1919         kfree(outbuf);
1920         kfree(inbuf);
1921
1922         return err;
1923 }
1924
1925 /*
1926  * Handle IOCTL calls from the Block Layer.
1927  *
1928  * This function is called by the Block Layer when it receives an IOCTL
1929  * command that it does not understand. If the IOCTL command is not supported
1930  * this function returns -ENOTTY.
1931  *
1932  * @dd  Pointer to the driver data structure.
1933  * @cmd IOCTL command passed from the Block Layer.
1934  * @arg IOCTL argument passed from the Block Layer.
1935  *
1936  * return value
1937  *      0       The IOCTL completed successfully.
1938  *      -ENOTTY The specified command is not supported.
1939  *      -EFAULT An error occurred copying data to a user space buffer.
1940  *      -EIO    An error occurred while executing the command.
1941  */
1942 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
1943                          unsigned long arg)
1944 {
1945         switch (cmd) {
1946         case HDIO_GET_IDENTITY:
1947         {
1948                 if (copy_to_user((void __user *)arg, dd->port->identify,
1949                                                 sizeof(u16) * ATA_ID_WORDS))
1950                         return -EFAULT;
1951                 break;
1952         }
1953         case HDIO_DRIVE_CMD:
1954         {
1955                 u8 drive_command[4];
1956
1957                 /* Copy the user command info to our buffer. */
1958                 if (copy_from_user(drive_command,
1959                                          (void __user *) arg,
1960                                          sizeof(drive_command)))
1961                         return -EFAULT;
1962
1963                 /* Execute the drive command. */
1964                 if (exec_drive_command(dd->port,
1965                                          drive_command,
1966                                          (void __user *) (arg+4)))
1967                         return -EIO;
1968
1969                 /* Copy the status back to the users buffer. */
1970                 if (copy_to_user((void __user *) arg,
1971                                          drive_command,
1972                                          sizeof(drive_command)))
1973                         return -EFAULT;
1974
1975                 break;
1976         }
1977         case HDIO_DRIVE_TASK:
1978         {
1979                 u8 drive_command[7];
1980
1981                 /* Copy the user command info to our buffer. */
1982                 if (copy_from_user(drive_command,
1983                                          (void __user *) arg,
1984                                          sizeof(drive_command)))
1985                         return -EFAULT;
1986
1987                 /* Execute the drive command. */
1988                 if (exec_drive_task(dd->port, drive_command))
1989                         return -EIO;
1990
1991                 /* Copy the status back to the users buffer. */
1992                 if (copy_to_user((void __user *) arg,
1993                                          drive_command,
1994                                          sizeof(drive_command)))
1995                         return -EFAULT;
1996
1997                 break;
1998         }
1999         case HDIO_DRIVE_TASKFILE: {
2000                 ide_task_request_t req_task;
2001                 int ret, outtotal;
2002
2003                 if (copy_from_user(&req_task, (void __user *) arg,
2004                                         sizeof(req_task)))
2005                         return -EFAULT;
2006
2007                 outtotal = sizeof(req_task);
2008
2009                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2010                                                 &req_task, outtotal);
2011
2012                 if (copy_to_user((void __user *) arg, &req_task,
2013                                                         sizeof(req_task)))
2014                         return -EFAULT;
2015
2016                 return ret;
2017         }
2018
2019         default:
2020                 return -EINVAL;
2021         }
2022         return 0;
2023 }
2024
2025 /*
2026  * Submit an IO to the hw
2027  *
2028  * This function is called by the block layer to issue an io
2029  * to the device. Upon completion, the callback function will
2030  * be called with the data parameter passed as the callback data.
2031  *
2032  * @dd       Pointer to the driver data structure.
2033  * @start    First sector to read.
2034  * @nsect    Number of sectors to read.
2035  * @tag      The tag of this read command.
2036  * @callback Pointer to the function that should be called
2037  *           when the read completes.
2038  * @data     Callback data passed to the callback function
2039  *           when the read completes.
2040  * @dir      Direction (read or write)
2041  *
2042  * return value
2043  *      None
2044  */
2045 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2046                               struct mtip_cmd *command,
2047                               struct blk_mq_hw_ctx *hctx)
2048 {
2049         struct mtip_cmd_hdr *hdr =
2050                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
2051         struct host_to_dev_fis  *fis;
2052         struct mtip_port *port = dd->port;
2053         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2054         u64 start = blk_rq_pos(rq);
2055         unsigned int nsect = blk_rq_sectors(rq);
2056         unsigned int nents;
2057
2058         /* Map the scatter list for DMA access */
2059         nents = blk_rq_map_sg(hctx->queue, rq, command->sg);
2060         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2061
2062         prefetch(&port->flags);
2063
2064         command->scatter_ents = nents;
2065
2066         /*
2067          * The number of retries for this command before it is
2068          * reported as a failure to the upper layers.
2069          */
2070         command->retries = MTIP_MAX_RETRIES;
2071
2072         /* Fill out fis */
2073         fis = command->command;
2074         fis->type        = 0x27;
2075         fis->opts        = 1 << 7;
2076         if (dma_dir == DMA_FROM_DEVICE)
2077                 fis->command = ATA_CMD_FPDMA_READ;
2078         else
2079                 fis->command = ATA_CMD_FPDMA_WRITE;
2080         fis->lba_low     = start & 0xFF;
2081         fis->lba_mid     = (start >> 8) & 0xFF;
2082         fis->lba_hi      = (start >> 16) & 0xFF;
2083         fis->lba_low_ex  = (start >> 24) & 0xFF;
2084         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2085         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2086         fis->device      = 1 << 6;
2087         fis->features    = nsect & 0xFF;
2088         fis->features_ex = (nsect >> 8) & 0xFF;
2089         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2090         fis->sect_cnt_ex = 0;
2091         fis->control     = 0;
2092         fis->res2        = 0;
2093         fis->res3        = 0;
2094         fill_command_sg(dd, command, nents);
2095
2096         if (unlikely(command->unaligned))
2097                 fis->device |= 1 << 7;
2098
2099         /* Populate the command header */
2100         hdr->ctba = cpu_to_le32(command->command_dma & 0xFFFFFFFF);
2101         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
2102                 hdr->ctbau = cpu_to_le32((command->command_dma >> 16) >> 16);
2103         hdr->opts = cpu_to_le32((nents << 16) | 5 | AHCI_CMD_PREFETCH);
2104         hdr->byte_count = 0;
2105
2106         command->direction = dma_dir;
2107
2108         /*
2109          * To prevent this command from being issued
2110          * if an internal command is in progress or error handling is active.
2111          */
2112         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2113                 set_bit(rq->tag, port->cmds_to_issue);
2114                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2115                 return;
2116         }
2117
2118         /* Issue the command to the hardware */
2119         mtip_issue_ncq_command(port, rq->tag);
2120 }
2121
2122 /*
2123  * Sysfs status dump.
2124  *
2125  * @dev  Pointer to the device structure, passed by the kernrel.
2126  * @attr Pointer to the device_attribute structure passed by the kernel.
2127  * @buf  Pointer to the char buffer that will receive the stats info.
2128  *
2129  * return value
2130  *      The size, in bytes, of the data copied into buf.
2131  */
2132 static ssize_t mtip_hw_show_status(struct device *dev,
2133                                 struct device_attribute *attr,
2134                                 char *buf)
2135 {
2136         struct driver_data *dd = dev_to_disk(dev)->private_data;
2137         int size = 0;
2138
2139         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2140                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2141         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2142                 size += sprintf(buf, "%s", "write_protect\n");
2143         else
2144                 size += sprintf(buf, "%s", "online\n");
2145
2146         return size;
2147 }
2148
2149 static DEVICE_ATTR(status, 0444, mtip_hw_show_status, NULL);
2150
2151 static struct attribute *mtip_disk_attrs[] = {
2152         &dev_attr_status.attr,
2153         NULL,
2154 };
2155
2156 static const struct attribute_group mtip_disk_attr_group = {
2157         .attrs = mtip_disk_attrs,
2158 };
2159
2160 static const struct attribute_group *mtip_disk_attr_groups[] = {
2161         &mtip_disk_attr_group,
2162         NULL,
2163 };
2164
2165 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2166                                   size_t len, loff_t *offset)
2167 {
2168         struct driver_data *dd =  (struct driver_data *)f->private_data;
2169         char *buf;
2170         u32 group_allocated;
2171         int size = *offset;
2172         int n, rv = 0;
2173
2174         if (!len || size)
2175                 return 0;
2176
2177         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2178         if (!buf)
2179                 return -ENOMEM;
2180
2181         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2182
2183         for (n = dd->slot_groups-1; n >= 0; n--)
2184                 size += sprintf(&buf[size], "%08X ",
2185                                          readl(dd->port->s_active[n]));
2186
2187         size += sprintf(&buf[size], "]\n");
2188         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2189
2190         for (n = dd->slot_groups-1; n >= 0; n--)
2191                 size += sprintf(&buf[size], "%08X ",
2192                                         readl(dd->port->cmd_issue[n]));
2193
2194         size += sprintf(&buf[size], "]\n");
2195         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2196
2197         for (n = dd->slot_groups-1; n >= 0; n--)
2198                 size += sprintf(&buf[size], "%08X ",
2199                                 readl(dd->port->completed[n]));
2200
2201         size += sprintf(&buf[size], "]\n");
2202         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2203                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2204         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2205                                 readl(dd->mmio + HOST_IRQ_STAT));
2206         size += sprintf(&buf[size], "\n");
2207
2208         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2209
2210         for (n = dd->slot_groups-1; n >= 0; n--) {
2211                 if (sizeof(long) > sizeof(u32))
2212                         group_allocated =
2213                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2214                 else
2215                         group_allocated = dd->port->cmds_to_issue[n];
2216                 size += sprintf(&buf[size], "%08X ", group_allocated);
2217         }
2218         size += sprintf(&buf[size], "]\n");
2219
2220         *offset = size <= len ? size : len;
2221         size = copy_to_user(ubuf, buf, *offset);
2222         if (size)
2223                 rv = -EFAULT;
2224
2225         kfree(buf);
2226         return rv ? rv : *offset;
2227 }
2228
2229 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2230                                   size_t len, loff_t *offset)
2231 {
2232         struct driver_data *dd =  (struct driver_data *)f->private_data;
2233         char *buf;
2234         int size = *offset;
2235         int rv = 0;
2236
2237         if (!len || size)
2238                 return 0;
2239
2240         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2241         if (!buf)
2242                 return -ENOMEM;
2243
2244         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2245                                                         dd->port->flags);
2246         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2247                                                         dd->dd_flag);
2248
2249         *offset = size <= len ? size : len;
2250         size = copy_to_user(ubuf, buf, *offset);
2251         if (size)
2252                 rv = -EFAULT;
2253
2254         kfree(buf);
2255         return rv ? rv : *offset;
2256 }
2257
2258 static const struct file_operations mtip_regs_fops = {
2259         .owner  = THIS_MODULE,
2260         .open   = simple_open,
2261         .read   = mtip_hw_read_registers,
2262         .llseek = no_llseek,
2263 };
2264
2265 static const struct file_operations mtip_flags_fops = {
2266         .owner  = THIS_MODULE,
2267         .open   = simple_open,
2268         .read   = mtip_hw_read_flags,
2269         .llseek = no_llseek,
2270 };
2271
2272 static int mtip_hw_debugfs_init(struct driver_data *dd)
2273 {
2274         if (!dfs_parent)
2275                 return -1;
2276
2277         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2278         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2279                 dev_warn(&dd->pdev->dev,
2280                         "Error creating node %s under debugfs\n",
2281                                                 dd->disk->disk_name);
2282                 dd->dfs_node = NULL;
2283                 return -1;
2284         }
2285
2286         debugfs_create_file("flags", 0444, dd->dfs_node, dd, &mtip_flags_fops);
2287         debugfs_create_file("registers", 0444, dd->dfs_node, dd,
2288                             &mtip_regs_fops);
2289
2290         return 0;
2291 }
2292
2293 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2294 {
2295         debugfs_remove_recursive(dd->dfs_node);
2296 }
2297
2298 /*
2299  * Perform any init/resume time hardware setup
2300  *
2301  * @dd Pointer to the driver data structure.
2302  *
2303  * return value
2304  *      None
2305  */
2306 static inline void hba_setup(struct driver_data *dd)
2307 {
2308         u32 hwdata;
2309         hwdata = readl(dd->mmio + HOST_HSORG);
2310
2311         /* interrupt bug workaround: use only 1 IS bit.*/
2312         writel(hwdata |
2313                 HSORG_DISABLE_SLOTGRP_INTR |
2314                 HSORG_DISABLE_SLOTGRP_PXIS,
2315                 dd->mmio + HOST_HSORG);
2316 }
2317
2318 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2319 {
2320         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2321 }
2322
2323 /*
2324  * Detect the details of the product, and store anything needed
2325  * into the driver data structure.  This includes product type and
2326  * version and number of slot groups.
2327  *
2328  * @dd Pointer to the driver data structure.
2329  *
2330  * return value
2331  *      None
2332  */
2333 static void mtip_detect_product(struct driver_data *dd)
2334 {
2335         u32 hwdata;
2336         unsigned int rev, slotgroups;
2337
2338         /*
2339          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2340          * info register:
2341          * [15:8] hardware/software interface rev#
2342          * [   3] asic-style interface
2343          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2344          */
2345         hwdata = readl(dd->mmio + HOST_HSORG);
2346
2347         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2348         dd->slot_groups = 1;
2349
2350         if (hwdata & 0x8) {
2351                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2352                 rev = (hwdata & HSORG_HWREV) >> 8;
2353                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2354                 dev_info(&dd->pdev->dev,
2355                         "ASIC-FPGA design, HS rev 0x%x, "
2356                         "%i slot groups [%i slots]\n",
2357                          rev,
2358                          slotgroups,
2359                          slotgroups * 32);
2360
2361                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2362                         dev_warn(&dd->pdev->dev,
2363                                 "Warning: driver only supports "
2364                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2365                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2366                 }
2367                 dd->slot_groups = slotgroups;
2368                 return;
2369         }
2370
2371         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2372 }
2373
2374 /*
2375  * Blocking wait for FTL rebuild to complete
2376  *
2377  * @dd Pointer to the DRIVER_DATA structure.
2378  *
2379  * return value
2380  *      0       FTL rebuild completed successfully
2381  *      -EFAULT FTL rebuild error/timeout/interruption
2382  */
2383 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2384 {
2385         unsigned long timeout, cnt = 0, start;
2386
2387         dev_warn(&dd->pdev->dev,
2388                 "FTL rebuild in progress. Polling for completion.\n");
2389
2390         start = jiffies;
2391         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2392
2393         do {
2394                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2395                                 &dd->dd_flag)))
2396                         return -EFAULT;
2397                 if (mtip_check_surprise_removal(dd))
2398                         return -EFAULT;
2399
2400                 if (mtip_get_identify(dd->port, NULL) < 0)
2401                         return -EFAULT;
2402
2403                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2404                         MTIP_FTL_REBUILD_MAGIC) {
2405                         ssleep(1);
2406                         /* Print message every 3 minutes */
2407                         if (cnt++ >= 180) {
2408                                 dev_warn(&dd->pdev->dev,
2409                                 "FTL rebuild in progress (%d secs).\n",
2410                                 jiffies_to_msecs(jiffies - start) / 1000);
2411                                 cnt = 0;
2412                         }
2413                 } else {
2414                         dev_warn(&dd->pdev->dev,
2415                                 "FTL rebuild complete (%d secs).\n",
2416                         jiffies_to_msecs(jiffies - start) / 1000);
2417                         mtip_block_initialize(dd);
2418                         return 0;
2419                 }
2420         } while (time_before(jiffies, timeout));
2421
2422         /* Check for timeout */
2423         dev_err(&dd->pdev->dev,
2424                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2425                 jiffies_to_msecs(jiffies - start) / 1000);
2426         return -EFAULT;
2427 }
2428
2429 static void mtip_softirq_done_fn(struct request *rq)
2430 {
2431         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2432         struct driver_data *dd = rq->q->queuedata;
2433
2434         /* Unmap the DMA scatter list entries */
2435         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2436                                                         cmd->direction);
2437
2438         if (unlikely(cmd->unaligned))
2439                 atomic_inc(&dd->port->cmd_slot_unal);
2440
2441         blk_mq_end_request(rq, cmd->status);
2442 }
2443
2444 static bool mtip_abort_cmd(struct request *req, void *data)
2445 {
2446         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
2447         struct driver_data *dd = data;
2448
2449         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2450
2451         clear_bit(req->tag, dd->port->cmds_to_issue);
2452         cmd->status = BLK_STS_IOERR;
2453         mtip_softirq_done_fn(req);
2454         return true;
2455 }
2456
2457 static bool mtip_queue_cmd(struct request *req, void *data)
2458 {
2459         struct driver_data *dd = data;
2460
2461         set_bit(req->tag, dd->port->cmds_to_issue);
2462         blk_abort_request(req);
2463         return true;
2464 }
2465
2466 /*
2467  * service thread to issue queued commands
2468  *
2469  * @data Pointer to the driver data structure.
2470  *
2471  * return value
2472  *      0
2473  */
2474
2475 static int mtip_service_thread(void *data)
2476 {
2477         struct driver_data *dd = (struct driver_data *)data;
2478         unsigned long slot, slot_start, slot_wrap, to;
2479         unsigned int num_cmd_slots = dd->slot_groups * 32;
2480         struct mtip_port *port = dd->port;
2481
2482         while (1) {
2483                 if (kthread_should_stop() ||
2484                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2485                         goto st_out;
2486                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2487
2488                 /*
2489                  * the condition is to check neither an internal command is
2490                  * is in progress nor error handling is active
2491                  */
2492                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2493                         (port->flags & MTIP_PF_SVC_THD_WORK));
2494
2495                 if (kthread_should_stop() ||
2496                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2497                         goto st_out;
2498
2499                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2500                                 &dd->dd_flag)))
2501                         goto st_out;
2502
2503                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2504
2505 restart_eh:
2506                 /* Demux bits: start with error handling */
2507                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2508                         mtip_handle_tfe(dd);
2509                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2510                 }
2511
2512                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2513                         goto restart_eh;
2514
2515                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2516                         to = jiffies + msecs_to_jiffies(5000);
2517
2518                         do {
2519                                 mdelay(100);
2520                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2521                                 time_before(jiffies, to));
2522
2523                         if (atomic_read(&dd->irq_workers_active) != 0)
2524                                 dev_warn(&dd->pdev->dev,
2525                                         "Completion workers still active!");
2526
2527                         blk_mq_quiesce_queue(dd->queue);
2528
2529                         blk_mq_tagset_busy_iter(&dd->tags, mtip_queue_cmd, dd);
2530
2531                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
2532
2533                         if (mtip_device_reset(dd))
2534                                 blk_mq_tagset_busy_iter(&dd->tags,
2535                                                         mtip_abort_cmd, dd);
2536
2537                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
2538
2539                         blk_mq_unquiesce_queue(dd->queue);
2540                 }
2541
2542                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2543                         slot = 1;
2544                         /* used to restrict the loop to one iteration */
2545                         slot_start = num_cmd_slots;
2546                         slot_wrap = 0;
2547                         while (1) {
2548                                 slot = find_next_bit(port->cmds_to_issue,
2549                                                 num_cmd_slots, slot);
2550                                 if (slot_wrap == 1) {
2551                                         if ((slot_start >= slot) ||
2552                                                 (slot >= num_cmd_slots))
2553                                                 break;
2554                                 }
2555                                 if (unlikely(slot_start == num_cmd_slots))
2556                                         slot_start = slot;
2557
2558                                 if (unlikely(slot == num_cmd_slots)) {
2559                                         slot = 1;
2560                                         slot_wrap = 1;
2561                                         continue;
2562                                 }
2563
2564                                 /* Issue the command to the hardware */
2565                                 mtip_issue_ncq_command(port, slot);
2566
2567                                 clear_bit(slot, port->cmds_to_issue);
2568                         }
2569
2570                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2571                 }
2572
2573                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2574                         if (mtip_ftl_rebuild_poll(dd) == 0)
2575                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2576                 }
2577         }
2578
2579 st_out:
2580         return 0;
2581 }
2582
2583 /*
2584  * DMA region teardown
2585  *
2586  * @dd Pointer to driver_data structure
2587  *
2588  * return value
2589  *      None
2590  */
2591 static void mtip_dma_free(struct driver_data *dd)
2592 {
2593         struct mtip_port *port = dd->port;
2594
2595         if (port->block1)
2596                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2597                                         port->block1, port->block1_dma);
2598
2599         if (port->command_list) {
2600                 dma_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2601                                 port->command_list, port->command_list_dma);
2602         }
2603 }
2604
2605 /*
2606  * DMA region setup
2607  *
2608  * @dd Pointer to driver_data structure
2609  *
2610  * return value
2611  *      -ENOMEM Not enough free DMA region space to initialize driver
2612  */
2613 static int mtip_dma_alloc(struct driver_data *dd)
2614 {
2615         struct mtip_port *port = dd->port;
2616
2617         /* Allocate dma memory for RX Fis, Identify, and Sector Buffer */
2618         port->block1 =
2619                 dma_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2620                                         &port->block1_dma, GFP_KERNEL);
2621         if (!port->block1)
2622                 return -ENOMEM;
2623
2624         /* Allocate dma memory for command list */
2625         port->command_list =
2626                 dma_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2627                                         &port->command_list_dma, GFP_KERNEL);
2628         if (!port->command_list) {
2629                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2630                                         port->block1, port->block1_dma);
2631                 port->block1 = NULL;
2632                 port->block1_dma = 0;
2633                 return -ENOMEM;
2634         }
2635
2636         /* Setup all pointers into first DMA region */
2637         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
2638         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
2639         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
2640         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
2641         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
2642         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
2643         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
2644         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
2645
2646         return 0;
2647 }
2648
2649 static int mtip_hw_get_identify(struct driver_data *dd)
2650 {
2651         struct smart_attr attr242;
2652         unsigned char *buf;
2653         int rv;
2654
2655         if (mtip_get_identify(dd->port, NULL) < 0)
2656                 return -EFAULT;
2657
2658         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2659                 MTIP_FTL_REBUILD_MAGIC) {
2660                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
2661                 return MTIP_FTL_REBUILD_MAGIC;
2662         }
2663         mtip_dump_identify(dd->port);
2664
2665         /* check write protect, over temp and rebuild statuses */
2666         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
2667                                 dd->port->log_buf,
2668                                 dd->port->log_buf_dma, 1);
2669         if (rv) {
2670                 dev_warn(&dd->pdev->dev,
2671                         "Error in READ LOG EXT (10h) command\n");
2672                 /* non-critical error, don't fail the load */
2673         } else {
2674                 buf = (unsigned char *)dd->port->log_buf;
2675                 if (buf[259] & 0x1) {
2676                         dev_info(&dd->pdev->dev,
2677                                 "Write protect bit is set.\n");
2678                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
2679                 }
2680                 if (buf[288] == 0xF7) {
2681                         dev_info(&dd->pdev->dev,
2682                                 "Exceeded Tmax, drive in thermal shutdown.\n");
2683                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
2684                 }
2685                 if (buf[288] == 0xBF) {
2686                         dev_info(&dd->pdev->dev,
2687                                 "Drive indicates rebuild has failed.\n");
2688                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
2689                 }
2690         }
2691
2692         /* get write protect progess */
2693         memset(&attr242, 0, sizeof(struct smart_attr));
2694         if (mtip_get_smart_attr(dd->port, 242, &attr242))
2695                 dev_warn(&dd->pdev->dev,
2696                                 "Unable to check write protect progress\n");
2697         else
2698                 dev_info(&dd->pdev->dev,
2699                                 "Write protect progress: %u%% (%u blocks)\n",
2700                                 attr242.cur, le32_to_cpu(attr242.data));
2701
2702         return rv;
2703 }
2704
2705 /*
2706  * Called once for each card.
2707  *
2708  * @dd Pointer to the driver data structure.
2709  *
2710  * return value
2711  *      0 on success, else an error code.
2712  */
2713 static int mtip_hw_init(struct driver_data *dd)
2714 {
2715         int i;
2716         int rv;
2717         unsigned long timeout, timetaken;
2718
2719         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2720
2721         mtip_detect_product(dd);
2722         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2723                 rv = -EIO;
2724                 goto out1;
2725         }
2726
2727         hba_setup(dd);
2728
2729         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
2730                                 dd->numa_node);
2731         if (!dd->port)
2732                 return -ENOMEM;
2733
2734         /* Continue workqueue setup */
2735         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2736                 dd->work[i].port = dd->port;
2737
2738         /* Enable unaligned IO constraints for some devices */
2739         if (mtip_device_unaligned_constrained(dd))
2740                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
2741         else
2742                 dd->unal_qdepth = 0;
2743
2744         atomic_set(&dd->port->cmd_slot_unal, dd->unal_qdepth);
2745
2746         /* Spinlock to prevent concurrent issue */
2747         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2748                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
2749
2750         /* Set the port mmio base address. */
2751         dd->port->mmio  = dd->mmio + PORT_OFFSET;
2752         dd->port->dd    = dd;
2753
2754         /* DMA allocations */
2755         rv = mtip_dma_alloc(dd);
2756         if (rv < 0)
2757                 goto out1;
2758
2759         /* Setup the pointers to the extended s_active and CI registers. */
2760         for (i = 0; i < dd->slot_groups; i++) {
2761                 dd->port->s_active[i] =
2762                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
2763                 dd->port->cmd_issue[i] =
2764                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
2765                 dd->port->completed[i] =
2766                         dd->port->mmio + i*0x80 + PORT_SDBV;
2767         }
2768
2769         timetaken = jiffies;
2770         timeout = jiffies + msecs_to_jiffies(30000);
2771         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
2772                  time_before(jiffies, timeout)) {
2773                 mdelay(100);
2774         }
2775         if (unlikely(mtip_check_surprise_removal(dd))) {
2776                 timetaken = jiffies - timetaken;
2777                 dev_warn(&dd->pdev->dev,
2778                         "Surprise removal detected at %u ms\n",
2779                         jiffies_to_msecs(timetaken));
2780                 rv = -ENODEV;
2781                 goto out2 ;
2782         }
2783         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2784                 timetaken = jiffies - timetaken;
2785                 dev_warn(&dd->pdev->dev,
2786                         "Removal detected at %u ms\n",
2787                         jiffies_to_msecs(timetaken));
2788                 rv = -EFAULT;
2789                 goto out2;
2790         }
2791
2792         /* Conditionally reset the HBA. */
2793         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
2794                 if (mtip_hba_reset(dd) < 0) {
2795                         dev_err(&dd->pdev->dev,
2796                                 "Card did not reset within timeout\n");
2797                         rv = -EIO;
2798                         goto out2;
2799                 }
2800         } else {
2801                 /* Clear any pending interrupts on the HBA */
2802                 writel(readl(dd->mmio + HOST_IRQ_STAT),
2803                         dd->mmio + HOST_IRQ_STAT);
2804         }
2805
2806         mtip_init_port(dd->port);
2807         mtip_start_port(dd->port);
2808
2809         /* Setup the ISR and enable interrupts. */
2810         rv = request_irq(dd->pdev->irq, mtip_irq_handler, IRQF_SHARED,
2811                          dev_driver_string(&dd->pdev->dev), dd);
2812         if (rv) {
2813                 dev_err(&dd->pdev->dev,
2814                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
2815                 goto out2;
2816         }
2817         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
2818
2819         /* Enable interrupts on the HBA. */
2820         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2821                                         dd->mmio + HOST_CTL);
2822
2823         init_waitqueue_head(&dd->port->svc_wait);
2824
2825         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
2826                 rv = -EFAULT;
2827                 goto out3;
2828         }
2829
2830         return rv;
2831
2832 out3:
2833         /* Disable interrupts on the HBA. */
2834         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2835                         dd->mmio + HOST_CTL);
2836
2837         /* Release the IRQ. */
2838         irq_set_affinity_hint(dd->pdev->irq, NULL);
2839         free_irq(dd->pdev->irq, dd);
2840
2841 out2:
2842         mtip_deinit_port(dd->port);
2843         mtip_dma_free(dd);
2844
2845 out1:
2846         /* Free the memory allocated for the for structure. */
2847         kfree(dd->port);
2848
2849         return rv;
2850 }
2851
2852 static int mtip_standby_drive(struct driver_data *dd)
2853 {
2854         int rv = 0;
2855
2856         if (dd->sr || !dd->port)
2857                 return -ENODEV;
2858         /*
2859          * Send standby immediate (E0h) to the drive so that it
2860          * saves its state.
2861          */
2862         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
2863             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
2864             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
2865                 rv = mtip_standby_immediate(dd->port);
2866                 if (rv)
2867                         dev_warn(&dd->pdev->dev,
2868                                 "STANDBY IMMEDIATE failed\n");
2869         }
2870         return rv;
2871 }
2872
2873 /*
2874  * Called to deinitialize an interface.
2875  *
2876  * @dd Pointer to the driver data structure.
2877  *
2878  * return value
2879  *      0
2880  */
2881 static int mtip_hw_exit(struct driver_data *dd)
2882 {
2883         if (!dd->sr) {
2884                 /* de-initialize the port. */
2885                 mtip_deinit_port(dd->port);
2886
2887                 /* Disable interrupts on the HBA. */
2888                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2889                                 dd->mmio + HOST_CTL);
2890         }
2891
2892         /* Release the IRQ. */
2893         irq_set_affinity_hint(dd->pdev->irq, NULL);
2894         free_irq(dd->pdev->irq, dd);
2895         msleep(1000);
2896
2897         /* Free dma regions */
2898         mtip_dma_free(dd);
2899
2900         /* Free the memory allocated for the for structure. */
2901         kfree(dd->port);
2902         dd->port = NULL;
2903
2904         return 0;
2905 }
2906
2907 /*
2908  * Issue a Standby Immediate command to the device.
2909  *
2910  * This function is called by the Block Layer just before the
2911  * system powers off during a shutdown.
2912  *
2913  * @dd Pointer to the driver data structure.
2914  *
2915  * return value
2916  *      0
2917  */
2918 static int mtip_hw_shutdown(struct driver_data *dd)
2919 {
2920         /*
2921          * Send standby immediate (E0h) to the drive so that it
2922          * saves its state.
2923          */
2924         mtip_standby_drive(dd);
2925
2926         return 0;
2927 }
2928
2929 /*
2930  * Suspend function
2931  *
2932  * This function is called by the Block Layer just before the
2933  * system hibernates.
2934  *
2935  * @dd Pointer to the driver data structure.
2936  *
2937  * return value
2938  *      0       Suspend was successful
2939  *      -EFAULT Suspend was not successful
2940  */
2941 static int mtip_hw_suspend(struct driver_data *dd)
2942 {
2943         /*
2944          * Send standby immediate (E0h) to the drive
2945          * so that it saves its state.
2946          */
2947         if (mtip_standby_drive(dd) != 0) {
2948                 dev_err(&dd->pdev->dev,
2949                         "Failed standby-immediate command\n");
2950                 return -EFAULT;
2951         }
2952
2953         /* Disable interrupts on the HBA.*/
2954         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2955                         dd->mmio + HOST_CTL);
2956         mtip_deinit_port(dd->port);
2957
2958         return 0;
2959 }
2960
2961 /*
2962  * Resume function
2963  *
2964  * This function is called by the Block Layer as the
2965  * system resumes.
2966  *
2967  * @dd Pointer to the driver data structure.
2968  *
2969  * return value
2970  *      0       Resume was successful
2971  *      -EFAULT Resume was not successful
2972  */
2973 static int mtip_hw_resume(struct driver_data *dd)
2974 {
2975         /* Perform any needed hardware setup steps */
2976         hba_setup(dd);
2977
2978         /* Reset the HBA */
2979         if (mtip_hba_reset(dd) != 0) {
2980                 dev_err(&dd->pdev->dev,
2981                         "Unable to reset the HBA\n");
2982                 return -EFAULT;
2983         }
2984
2985         /*
2986          * Enable the port, DMA engine, and FIS reception specific
2987          * h/w in controller.
2988          */
2989         mtip_init_port(dd->port);
2990         mtip_start_port(dd->port);
2991
2992         /* Enable interrupts on the HBA.*/
2993         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2994                         dd->mmio + HOST_CTL);
2995
2996         return 0;
2997 }
2998
2999 /*
3000  * Helper function for reusing disk name
3001  * upon hot insertion.
3002  */
3003 static int rssd_disk_name_format(char *prefix,
3004                                  int index,
3005                                  char *buf,
3006                                  int buflen)
3007 {
3008         const int base = 'z' - 'a' + 1;
3009         char *begin = buf + strlen(prefix);
3010         char *end = buf + buflen;
3011         char *p;
3012         int unit;
3013
3014         p = end - 1;
3015         *p = '\0';
3016         unit = base;
3017         do {
3018                 if (p == begin)
3019                         return -EINVAL;
3020                 *--p = 'a' + (index % unit);
3021                 index = (index / unit) - 1;
3022         } while (index >= 0);
3023
3024         memmove(begin, p, end - p);
3025         memcpy(buf, prefix, strlen(prefix));
3026
3027         return 0;
3028 }
3029
3030 /*
3031  * Block layer IOCTL handler.
3032  *
3033  * @dev Pointer to the block_device structure.
3034  * @mode ignored
3035  * @cmd IOCTL command passed from the user application.
3036  * @arg Argument passed from the user application.
3037  *
3038  * return value
3039  *      0        IOCTL completed successfully.
3040  *      -ENOTTY  IOCTL not supported or invalid driver data
3041  *                 structure pointer.
3042  */
3043 static int mtip_block_ioctl(struct block_device *dev,
3044                             blk_mode_t mode,
3045                             unsigned cmd,
3046                             unsigned long arg)
3047 {
3048         struct driver_data *dd = dev->bd_disk->private_data;
3049
3050         if (!capable(CAP_SYS_ADMIN))
3051                 return -EACCES;
3052
3053         if (!dd)
3054                 return -ENOTTY;
3055
3056         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3057                 return -ENOTTY;
3058
3059         switch (cmd) {
3060         case BLKFLSBUF:
3061                 return -ENOTTY;
3062         default:
3063                 return mtip_hw_ioctl(dd, cmd, arg);
3064         }
3065 }
3066
3067 #ifdef CONFIG_COMPAT
3068 /*
3069  * Block layer compat IOCTL handler.
3070  *
3071  * @dev Pointer to the block_device structure.
3072  * @mode ignored
3073  * @cmd IOCTL command passed from the user application.
3074  * @arg Argument passed from the user application.
3075  *
3076  * return value
3077  *      0        IOCTL completed successfully.
3078  *      -ENOTTY  IOCTL not supported or invalid driver data
3079  *                 structure pointer.
3080  */
3081 static int mtip_block_compat_ioctl(struct block_device *dev,
3082                             blk_mode_t mode,
3083                             unsigned cmd,
3084                             unsigned long arg)
3085 {
3086         struct driver_data *dd = dev->bd_disk->private_data;
3087
3088         if (!capable(CAP_SYS_ADMIN))
3089                 return -EACCES;
3090
3091         if (!dd)
3092                 return -ENOTTY;
3093
3094         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3095                 return -ENOTTY;
3096
3097         switch (cmd) {
3098         case BLKFLSBUF:
3099                 return -ENOTTY;
3100         case HDIO_DRIVE_TASKFILE: {
3101                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3102                 ide_task_request_t req_task;
3103                 int compat_tasksize, outtotal, ret;
3104
3105                 compat_tasksize =
3106                         sizeof(struct mtip_compat_ide_task_request_s);
3107
3108                 compat_req_task =
3109                         (struct mtip_compat_ide_task_request_s __user *) arg;
3110
3111                 if (copy_from_user(&req_task, (void __user *) arg,
3112                         compat_tasksize - (2 * sizeof(compat_long_t))))
3113                         return -EFAULT;
3114
3115                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3116                         return -EFAULT;
3117
3118                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3119                         return -EFAULT;
3120
3121                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3122
3123                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3124                                                 &req_task, outtotal);
3125
3126                 if (copy_to_user((void __user *) arg, &req_task,
3127                                 compat_tasksize -
3128                                 (2 * sizeof(compat_long_t))))
3129                         return -EFAULT;
3130
3131                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3132                         return -EFAULT;
3133
3134                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3135                         return -EFAULT;
3136
3137                 return ret;
3138         }
3139         default:
3140                 return mtip_hw_ioctl(dd, cmd, arg);
3141         }
3142 }
3143 #endif
3144
3145 /*
3146  * Obtain the geometry of the device.
3147  *
3148  * You may think that this function is obsolete, but some applications,
3149  * fdisk for example still used CHS values. This function describes the
3150  * device as having 224 heads and 56 sectors per cylinder. These values are
3151  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3152  * partition is described in terms of a start and end cylinder this means
3153  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3154  * affects performance.
3155  *
3156  * @dev Pointer to the block_device strucutre.
3157  * @geo Pointer to a hd_geometry structure.
3158  *
3159  * return value
3160  *      0       Operation completed successfully.
3161  *      -ENOTTY An error occurred while reading the drive capacity.
3162  */
3163 static int mtip_block_getgeo(struct block_device *dev,
3164                                 struct hd_geometry *geo)
3165 {
3166         struct driver_data *dd = dev->bd_disk->private_data;
3167         sector_t capacity;
3168
3169         if (!dd)
3170                 return -ENOTTY;
3171
3172         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3173                 dev_warn(&dd->pdev->dev,
3174                         "Could not get drive capacity.\n");
3175                 return -ENOTTY;
3176         }
3177
3178         geo->heads = 224;
3179         geo->sectors = 56;
3180         sector_div(capacity, (geo->heads * geo->sectors));
3181         geo->cylinders = capacity;
3182         return 0;
3183 }
3184
3185 static void mtip_block_free_disk(struct gendisk *disk)
3186 {
3187         struct driver_data *dd = disk->private_data;
3188
3189         ida_free(&rssd_index_ida, dd->index);
3190         kfree(dd);
3191 }
3192
3193 /*
3194  * Block device operation function.
3195  *
3196  * This structure contains pointers to the functions required by the block
3197  * layer.
3198  */
3199 static const struct block_device_operations mtip_block_ops = {
3200         .ioctl          = mtip_block_ioctl,
3201 #ifdef CONFIG_COMPAT
3202         .compat_ioctl   = mtip_block_compat_ioctl,
3203 #endif
3204         .getgeo         = mtip_block_getgeo,
3205         .free_disk      = mtip_block_free_disk,
3206         .owner          = THIS_MODULE
3207 };
3208
3209 static inline bool is_se_active(struct driver_data *dd)
3210 {
3211         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3212                 if (dd->port->ic_pause_timer) {
3213                         unsigned long to = dd->port->ic_pause_timer +
3214                                                         msecs_to_jiffies(1000);
3215                         if (time_after(jiffies, to)) {
3216                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3217                                                         &dd->port->flags);
3218                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3219                                 dd->port->ic_pause_timer = 0;
3220                                 wake_up_interruptible(&dd->port->svc_wait);
3221                                 return false;
3222                         }
3223                 }
3224                 return true;
3225         }
3226         return false;
3227 }
3228
3229 static inline bool is_stopped(struct driver_data *dd, struct request *rq)
3230 {
3231         if (likely(!(dd->dd_flag & MTIP_DDF_STOP_IO)))
3232                 return false;
3233
3234         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
3235                 return true;
3236         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
3237                 return true;
3238         if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag) &&
3239             rq_data_dir(rq))
3240                 return true;
3241         if (test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))
3242                 return true;
3243         if (test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag))
3244                 return true;
3245
3246         return false;
3247 }
3248
3249 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3250                                   struct request *rq)
3251 {
3252         struct driver_data *dd = hctx->queue->queuedata;
3253         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3254
3255         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3256                 return false;
3257
3258         /*
3259          * If unaligned depth must be limited on this controller, mark it
3260          * as unaligned if the IO isn't on a 4k boundary (start of length).
3261          */
3262         if (blk_rq_sectors(rq) <= 64) {
3263                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3264                         cmd->unaligned = 1;
3265         }
3266
3267         if (cmd->unaligned && atomic_dec_if_positive(&dd->port->cmd_slot_unal) >= 0)
3268                 return true;
3269
3270         return false;
3271 }
3272
3273 static blk_status_t mtip_issue_reserved_cmd(struct blk_mq_hw_ctx *hctx,
3274                 struct request *rq)
3275 {
3276         struct driver_data *dd = hctx->queue->queuedata;
3277         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3278         struct mtip_int_cmd *icmd = cmd->icmd;
3279         struct mtip_cmd_hdr *hdr =
3280                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
3281         struct mtip_cmd_sg *command_sg;
3282
3283         if (mtip_commands_active(dd->port))
3284                 return BLK_STS_DEV_RESOURCE;
3285
3286         hdr->ctba = cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
3287         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
3288                 hdr->ctbau = cpu_to_le32((cmd->command_dma >> 16) >> 16);
3289         /* Populate the SG list */
3290         hdr->opts = cpu_to_le32(icmd->opts | icmd->fis_len);
3291         if (icmd->buf_len) {
3292                 command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
3293
3294                 command_sg->info = cpu_to_le32((icmd->buf_len-1) & 0x3FFFFF);
3295                 command_sg->dba = cpu_to_le32(icmd->buffer & 0xFFFFFFFF);
3296                 command_sg->dba_upper =
3297                         cpu_to_le32((icmd->buffer >> 16) >> 16);
3298
3299                 hdr->opts |= cpu_to_le32((1 << 16));
3300         }
3301
3302         /* Populate the command header */
3303         hdr->byte_count = 0;
3304
3305         blk_mq_start_request(rq);
3306         mtip_issue_non_ncq_command(dd->port, rq->tag);
3307         return 0;
3308 }
3309
3310 static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3311                          const struct blk_mq_queue_data *bd)
3312 {
3313         struct driver_data *dd = hctx->queue->queuedata;
3314         struct request *rq = bd->rq;
3315         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3316
3317         if (blk_rq_is_passthrough(rq))
3318                 return mtip_issue_reserved_cmd(hctx, rq);
3319
3320         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3321                 return BLK_STS_DEV_RESOURCE;
3322
3323         if (is_se_active(dd) || is_stopped(dd, rq))
3324                 return BLK_STS_IOERR;
3325
3326         blk_mq_start_request(rq);
3327
3328         mtip_hw_submit_io(dd, rq, cmd, hctx);
3329         return BLK_STS_OK;
3330 }
3331
3332 static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
3333                           unsigned int hctx_idx)
3334 {
3335         struct driver_data *dd = set->driver_data;
3336         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3337
3338         if (!cmd->command)
3339                 return;
3340
3341         dma_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ, cmd->command,
3342                           cmd->command_dma);
3343 }
3344
3345 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
3346                          unsigned int hctx_idx, unsigned int numa_node)
3347 {
3348         struct driver_data *dd = set->driver_data;
3349         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3350
3351         cmd->command = dma_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3352                         &cmd->command_dma, GFP_KERNEL);
3353         if (!cmd->command)
3354                 return -ENOMEM;
3355
3356         sg_init_table(cmd->sg, MTIP_MAX_SG);
3357         return 0;
3358 }
3359
3360 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req)
3361 {
3362         struct driver_data *dd = req->q->queuedata;
3363
3364         if (blk_mq_is_reserved_rq(req)) {
3365                 struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
3366
3367                 cmd->status = BLK_STS_TIMEOUT;
3368                 blk_mq_complete_request(req);
3369                 return BLK_EH_DONE;
3370         }
3371
3372         if (test_bit(req->tag, dd->port->cmds_to_issue))
3373                 goto exit_handler;
3374
3375         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3376                 goto exit_handler;
3377
3378         wake_up_interruptible(&dd->port->svc_wait);
3379 exit_handler:
3380         return BLK_EH_RESET_TIMER;
3381 }
3382
3383 static const struct blk_mq_ops mtip_mq_ops = {
3384         .queue_rq       = mtip_queue_rq,
3385         .init_request   = mtip_init_cmd,
3386         .exit_request   = mtip_free_cmd,
3387         .complete       = mtip_softirq_done_fn,
3388         .timeout        = mtip_cmd_timeout,
3389 };
3390
3391 /*
3392  * Block layer initialization function.
3393  *
3394  * This function is called once by the PCI layer for each P320
3395  * device that is connected to the system.
3396  *
3397  * @dd Pointer to the driver data structure.
3398  *
3399  * return value
3400  *      0 on success else an error code.
3401  */
3402 static int mtip_block_initialize(struct driver_data *dd)
3403 {
3404         int rv = 0, wait_for_rebuild = 0;
3405         sector_t capacity;
3406         unsigned int index = 0;
3407
3408         if (dd->disk)
3409                 goto skip_create_disk; /* hw init done, before rebuild */
3410
3411         if (mtip_hw_init(dd)) {
3412                 rv = -EINVAL;
3413                 goto protocol_init_error;
3414         }
3415
3416         memset(&dd->tags, 0, sizeof(dd->tags));
3417         dd->tags.ops = &mtip_mq_ops;
3418         dd->tags.nr_hw_queues = 1;
3419         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3420         dd->tags.reserved_tags = 1;
3421         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3422         dd->tags.numa_node = dd->numa_node;
3423         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3424         dd->tags.driver_data = dd;
3425         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3426
3427         rv = blk_mq_alloc_tag_set(&dd->tags);
3428         if (rv) {
3429                 dev_err(&dd->pdev->dev,
3430                         "Unable to allocate request queue\n");
3431                 goto block_queue_alloc_tag_error;
3432         }
3433
3434         dd->disk = blk_mq_alloc_disk(&dd->tags, dd);
3435         if (IS_ERR(dd->disk)) {
3436                 dev_err(&dd->pdev->dev,
3437                         "Unable to allocate request queue\n");
3438                 rv = -ENOMEM;
3439                 goto block_queue_alloc_init_error;
3440         }
3441         dd->queue               = dd->disk->queue;
3442
3443         rv = ida_alloc(&rssd_index_ida, GFP_KERNEL);
3444         if (rv < 0)
3445                 goto ida_get_error;
3446         index = rv;
3447
3448         rv = rssd_disk_name_format("rssd",
3449                                 index,
3450                                 dd->disk->disk_name,
3451                                 DISK_NAME_LEN);
3452         if (rv)
3453                 goto disk_index_error;
3454
3455         dd->disk->major         = dd->major;
3456         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3457         dd->disk->minors        = MTIP_MAX_MINORS;
3458         dd->disk->fops          = &mtip_block_ops;
3459         dd->disk->private_data  = dd;
3460         dd->index               = index;
3461
3462         mtip_hw_debugfs_init(dd);
3463
3464 skip_create_disk:
3465         /* Initialize the protocol layer. */
3466         wait_for_rebuild = mtip_hw_get_identify(dd);
3467         if (wait_for_rebuild < 0) {
3468                 dev_err(&dd->pdev->dev,
3469                         "Protocol layer initialization failed\n");
3470                 rv = -EINVAL;
3471                 goto init_hw_cmds_error;
3472         }
3473
3474         /*
3475          * if rebuild pending, start the service thread, and delay the block
3476          * queue creation and device_add_disk()
3477          */
3478         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3479                 goto start_service_thread;
3480
3481         /* Set device limits. */
3482         blk_queue_flag_set(QUEUE_FLAG_NONROT, dd->queue);
3483         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, dd->queue);
3484         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3485         blk_queue_physical_block_size(dd->queue, 4096);
3486         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3487         blk_queue_max_segment_size(dd->queue, 0x400000);
3488         dma_set_max_seg_size(&dd->pdev->dev, 0x400000);
3489         blk_queue_io_min(dd->queue, 4096);
3490
3491         /* Set the capacity of the device in 512 byte sectors. */
3492         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3493                 dev_warn(&dd->pdev->dev,
3494                         "Could not read drive capacity\n");
3495                 rv = -EIO;
3496                 goto read_capacity_error;
3497         }
3498         set_capacity(dd->disk, capacity);
3499
3500         /* Enable the block device and add it to /dev */
3501         rv = device_add_disk(&dd->pdev->dev, dd->disk, mtip_disk_attr_groups);
3502         if (rv)
3503                 goto read_capacity_error;
3504
3505         if (dd->mtip_svc_handler) {
3506                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3507                 return rv; /* service thread created for handling rebuild */
3508         }
3509
3510 start_service_thread:
3511         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3512                                                 dd, dd->numa_node,
3513                                                 "mtip_svc_thd_%02d", index);
3514
3515         if (IS_ERR(dd->mtip_svc_handler)) {
3516                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3517                 dd->mtip_svc_handler = NULL;
3518                 rv = -EFAULT;
3519                 goto kthread_run_error;
3520         }
3521         wake_up_process(dd->mtip_svc_handler);
3522         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3523                 rv = wait_for_rebuild;
3524
3525         return rv;
3526
3527 kthread_run_error:
3528         /* Delete our gendisk. This also removes the device from /dev */
3529         del_gendisk(dd->disk);
3530 read_capacity_error:
3531 init_hw_cmds_error:
3532         mtip_hw_debugfs_exit(dd);
3533 disk_index_error:
3534         ida_free(&rssd_index_ida, index);
3535 ida_get_error:
3536         put_disk(dd->disk);
3537 block_queue_alloc_init_error:
3538         blk_mq_free_tag_set(&dd->tags);
3539 block_queue_alloc_tag_error:
3540         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3541 protocol_init_error:
3542         return rv;
3543 }
3544
3545 /*
3546  * Function called by the PCI layer when just before the
3547  * machine shuts down.
3548  *
3549  * If a protocol layer shutdown function is present it will be called
3550  * by this function.
3551  *
3552  * @dd Pointer to the driver data structure.
3553  *
3554  * return value
3555  *      0
3556  */
3557 static int mtip_block_shutdown(struct driver_data *dd)
3558 {
3559         mtip_hw_shutdown(dd);
3560
3561         dev_info(&dd->pdev->dev,
3562                 "Shutting down %s ...\n", dd->disk->disk_name);
3563
3564         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3565                 del_gendisk(dd->disk);
3566
3567         blk_mq_free_tag_set(&dd->tags);
3568         put_disk(dd->disk);
3569         return 0;
3570 }
3571
3572 static int mtip_block_suspend(struct driver_data *dd)
3573 {
3574         dev_info(&dd->pdev->dev,
3575                 "Suspending %s ...\n", dd->disk->disk_name);
3576         mtip_hw_suspend(dd);
3577         return 0;
3578 }
3579
3580 static int mtip_block_resume(struct driver_data *dd)
3581 {
3582         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
3583                 dd->disk->disk_name);
3584         mtip_hw_resume(dd);
3585         return 0;
3586 }
3587
3588 static void drop_cpu(int cpu)
3589 {
3590         cpu_use[cpu]--;
3591 }
3592
3593 static int get_least_used_cpu_on_node(int node)
3594 {
3595         int cpu, least_used_cpu, least_cnt;
3596         const struct cpumask *node_mask;
3597
3598         node_mask = cpumask_of_node(node);
3599         least_used_cpu = cpumask_first(node_mask);
3600         least_cnt = cpu_use[least_used_cpu];
3601         cpu = least_used_cpu;
3602
3603         for_each_cpu(cpu, node_mask) {
3604                 if (cpu_use[cpu] < least_cnt) {
3605                         least_used_cpu = cpu;
3606                         least_cnt = cpu_use[cpu];
3607                 }
3608         }
3609         cpu_use[least_used_cpu]++;
3610         return least_used_cpu;
3611 }
3612
3613 /* Helper for selecting a node in round robin mode */
3614 static inline int mtip_get_next_rr_node(void)
3615 {
3616         static int next_node = NUMA_NO_NODE;
3617
3618         if (next_node == NUMA_NO_NODE) {
3619                 next_node = first_online_node;
3620                 return next_node;
3621         }
3622
3623         next_node = next_online_node(next_node);
3624         if (next_node == MAX_NUMNODES)
3625                 next_node = first_online_node;
3626         return next_node;
3627 }
3628
3629 static DEFINE_HANDLER(0);
3630 static DEFINE_HANDLER(1);
3631 static DEFINE_HANDLER(2);
3632 static DEFINE_HANDLER(3);
3633 static DEFINE_HANDLER(4);
3634 static DEFINE_HANDLER(5);
3635 static DEFINE_HANDLER(6);
3636 static DEFINE_HANDLER(7);
3637
3638 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
3639 {
3640         unsigned short pcie_dev_ctrl;
3641
3642         if (pci_is_pcie(pdev)) {
3643                 pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctrl);
3644                 if (pcie_dev_ctrl & PCI_EXP_DEVCTL_NOSNOOP_EN ||
3645                     pcie_dev_ctrl & PCI_EXP_DEVCTL_RELAX_EN) {
3646                         dev_info(&dd->pdev->dev,
3647                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
3648                                         pdev->vendor, pdev->device);
3649                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
3650                                                 PCI_EXP_DEVCTL_RELAX_EN);
3651                         pcie_capability_write_word(pdev, PCI_EXP_DEVCTL,
3652                                 pcie_dev_ctrl);
3653                 }
3654         }
3655 }
3656
3657 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
3658 {
3659         /*
3660          * This workaround is specific to AMD/ATI chipset with a PCI upstream
3661          * device with device id 0x5aXX
3662          */
3663         if (pdev->bus && pdev->bus->self) {
3664                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
3665                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
3666                         mtip_disable_link_opts(dd, pdev->bus->self);
3667                 } else {
3668                         /* Check further up the topology */
3669                         struct pci_dev *parent_dev = pdev->bus->self;
3670                         if (parent_dev->bus &&
3671                                 parent_dev->bus->parent &&
3672                                 parent_dev->bus->parent->self &&
3673                                 parent_dev->bus->parent->self->vendor ==
3674                                          PCI_VENDOR_ID_ATI &&
3675                                 (parent_dev->bus->parent->self->device &
3676                                         0xff00) == 0x5a00) {
3677                                 mtip_disable_link_opts(dd,
3678                                         parent_dev->bus->parent->self);
3679                         }
3680                 }
3681         }
3682 }
3683
3684 /*
3685  * Called for each supported PCI device detected.
3686  *
3687  * This function allocates the private data structure, enables the
3688  * PCI device and then calls the block layer initialization function.
3689  *
3690  * return value
3691  *      0 on success else an error code.
3692  */
3693 static int mtip_pci_probe(struct pci_dev *pdev,
3694                         const struct pci_device_id *ent)
3695 {
3696         int rv = 0;
3697         struct driver_data *dd = NULL;
3698         char cpu_list[256];
3699         const struct cpumask *node_mask;
3700         int cpu, i = 0, j = 0;
3701         int my_node = NUMA_NO_NODE;
3702
3703         /* Allocate memory for this devices private data. */
3704         my_node = pcibus_to_node(pdev->bus);
3705         if (my_node != NUMA_NO_NODE) {
3706                 if (!node_online(my_node))
3707                         my_node = mtip_get_next_rr_node();
3708         } else {
3709                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
3710                 my_node = mtip_get_next_rr_node();
3711         }
3712         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
3713                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
3714                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
3715
3716         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
3717         if (!dd)
3718                 return -ENOMEM;
3719
3720         /* Attach the private data to this PCI device.  */
3721         pci_set_drvdata(pdev, dd);
3722
3723         rv = pcim_enable_device(pdev);
3724         if (rv < 0) {
3725                 dev_err(&pdev->dev, "Unable to enable device\n");
3726                 goto iomap_err;
3727         }
3728
3729         /* Map BAR5 to memory. */
3730         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
3731         if (rv < 0) {
3732                 dev_err(&pdev->dev, "Unable to map regions\n");
3733                 goto iomap_err;
3734         }
3735
3736         rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3737         if (rv) {
3738                 dev_warn(&pdev->dev, "64-bit DMA enable failed\n");
3739                 goto setmask_err;
3740         }
3741
3742         /* Copy the info we may need later into the private data structure. */
3743         dd->major       = mtip_major;
3744         dd->instance    = instance;
3745         dd->pdev        = pdev;
3746         dd->numa_node   = my_node;
3747
3748         memset(dd->workq_name, 0, 32);
3749         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
3750
3751         dd->isr_workq = create_workqueue(dd->workq_name);
3752         if (!dd->isr_workq) {
3753                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
3754                 rv = -ENOMEM;
3755                 goto setmask_err;
3756         }
3757
3758         memset(cpu_list, 0, sizeof(cpu_list));
3759
3760         node_mask = cpumask_of_node(dd->numa_node);
3761         if (!cpumask_empty(node_mask)) {
3762                 for_each_cpu(cpu, node_mask)
3763                 {
3764                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
3765                         j = strlen(cpu_list);
3766                 }
3767
3768                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
3769                         dd->numa_node,
3770                         topology_physical_package_id(cpumask_first(node_mask)),
3771                         nr_cpus_node(dd->numa_node),
3772                         cpu_list);
3773         } else
3774                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
3775
3776         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
3777         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
3778                 cpu_to_node(dd->isr_binding), dd->isr_binding);
3779
3780         /* first worker context always runs in ISR */
3781         dd->work[0].cpu_binding = dd->isr_binding;
3782         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
3783         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
3784         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
3785         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
3786         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
3787         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
3788         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
3789
3790         /* Log the bindings */
3791         for_each_present_cpu(cpu) {
3792                 memset(cpu_list, 0, sizeof(cpu_list));
3793                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
3794                         if (dd->work[i].cpu_binding == cpu) {
3795                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
3796                                 j = strlen(cpu_list);
3797                         }
3798                 }
3799                 if (j)
3800                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
3801         }
3802
3803         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
3804         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
3805         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
3806         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
3807         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
3808         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
3809         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
3810         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
3811
3812         pci_set_master(pdev);
3813         rv = pci_enable_msi(pdev);
3814         if (rv) {
3815                 dev_warn(&pdev->dev,
3816                         "Unable to enable MSI interrupt.\n");
3817                 goto msi_initialize_err;
3818         }
3819
3820         mtip_fix_ero_nosnoop(dd, pdev);
3821
3822         /* Initialize the block layer. */
3823         rv = mtip_block_initialize(dd);
3824         if (rv < 0) {
3825                 dev_err(&pdev->dev,
3826                         "Unable to initialize block layer\n");
3827                 goto block_initialize_err;
3828         }
3829
3830         /*
3831          * Increment the instance count so that each device has a unique
3832          * instance number.
3833          */
3834         instance++;
3835         if (rv != MTIP_FTL_REBUILD_MAGIC)
3836                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3837         else
3838                 rv = 0; /* device in rebuild state, return 0 from probe */
3839
3840         goto done;
3841
3842 block_initialize_err:
3843         pci_disable_msi(pdev);
3844
3845 msi_initialize_err:
3846         if (dd->isr_workq) {
3847                 destroy_workqueue(dd->isr_workq);
3848                 drop_cpu(dd->work[0].cpu_binding);
3849                 drop_cpu(dd->work[1].cpu_binding);
3850                 drop_cpu(dd->work[2].cpu_binding);
3851         }
3852 setmask_err:
3853         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
3854
3855 iomap_err:
3856         kfree(dd);
3857         pci_set_drvdata(pdev, NULL);
3858         return rv;
3859 done:
3860         return rv;
3861 }
3862
3863 /*
3864  * Called for each probed device when the device is removed or the
3865  * driver is unloaded.
3866  *
3867  * return value
3868  *      None
3869  */
3870 static void mtip_pci_remove(struct pci_dev *pdev)
3871 {
3872         struct driver_data *dd = pci_get_drvdata(pdev);
3873         unsigned long to;
3874
3875         mtip_check_surprise_removal(dd);
3876         synchronize_irq(dd->pdev->irq);
3877
3878         /* Spin until workers are done */
3879         to = jiffies + msecs_to_jiffies(4000);
3880         do {
3881                 msleep(20);
3882         } while (atomic_read(&dd->irq_workers_active) != 0 &&
3883                 time_before(jiffies, to));
3884
3885         if (atomic_read(&dd->irq_workers_active) != 0) {
3886                 dev_warn(&dd->pdev->dev,
3887                         "Completion workers still active!\n");
3888         }
3889
3890         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
3891
3892         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3893                 del_gendisk(dd->disk);
3894
3895         mtip_hw_debugfs_exit(dd);
3896
3897         if (dd->mtip_svc_handler) {
3898                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3899                 wake_up_interruptible(&dd->port->svc_wait);
3900                 kthread_stop(dd->mtip_svc_handler);
3901         }
3902
3903         if (!dd->sr) {
3904                 /*
3905                  * Explicitly wait here for IOs to quiesce,
3906                  * as mtip_standby_drive usually won't wait for IOs.
3907                  */
3908                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS))
3909                         mtip_standby_drive(dd);
3910         }
3911         else
3912                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
3913                                                 dd->disk->disk_name);
3914
3915         blk_mq_free_tag_set(&dd->tags);
3916
3917         /* De-initialize the protocol layer. */
3918         mtip_hw_exit(dd);
3919
3920         if (dd->isr_workq) {
3921                 destroy_workqueue(dd->isr_workq);
3922                 drop_cpu(dd->work[0].cpu_binding);
3923                 drop_cpu(dd->work[1].cpu_binding);
3924                 drop_cpu(dd->work[2].cpu_binding);
3925         }
3926
3927         pci_disable_msi(pdev);
3928
3929         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
3930         pci_set_drvdata(pdev, NULL);
3931
3932         put_disk(dd->disk);
3933 }
3934
3935 /*
3936  * Called for each probed device when the device is suspended.
3937  *
3938  * return value
3939  *      0  Success
3940  *      <0 Error
3941  */
3942 static int __maybe_unused mtip_pci_suspend(struct device *dev)
3943 {
3944         int rv = 0;
3945         struct driver_data *dd = dev_get_drvdata(dev);
3946
3947         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
3948
3949         /* Disable ports & interrupts then send standby immediate */
3950         rv = mtip_block_suspend(dd);
3951         if (rv < 0)
3952                 dev_err(dev, "Failed to suspend controller\n");
3953
3954         return rv;
3955 }
3956
3957 /*
3958  * Called for each probed device when the device is resumed.
3959  *
3960  * return value
3961  *      0  Success
3962  *      <0 Error
3963  */
3964 static int __maybe_unused mtip_pci_resume(struct device *dev)
3965 {
3966         int rv = 0;
3967         struct driver_data *dd = dev_get_drvdata(dev);
3968
3969         /*
3970          * Calls hbaReset, initPort, & startPort function
3971          * then enables interrupts
3972          */
3973         rv = mtip_block_resume(dd);
3974         if (rv < 0)
3975                 dev_err(dev, "Unable to resume\n");
3976
3977         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
3978
3979         return rv;
3980 }
3981
3982 /*
3983  * Shutdown routine
3984  *
3985  * return value
3986  *      None
3987  */
3988 static void mtip_pci_shutdown(struct pci_dev *pdev)
3989 {
3990         struct driver_data *dd = pci_get_drvdata(pdev);
3991         if (dd)
3992                 mtip_block_shutdown(dd);
3993 }
3994
3995 /* Table of device ids supported by this driver. */
3996 static const struct pci_device_id mtip_pci_tbl[] = {
3997         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
3998         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
3999         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4000         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4001         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4002         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4003         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4004         { 0 }
4005 };
4006
4007 static SIMPLE_DEV_PM_OPS(mtip_pci_pm_ops, mtip_pci_suspend, mtip_pci_resume);
4008
4009 /* Structure that describes the PCI driver functions. */
4010 static struct pci_driver mtip_pci_driver = {
4011         .name                   = MTIP_DRV_NAME,
4012         .id_table               = mtip_pci_tbl,
4013         .probe                  = mtip_pci_probe,
4014         .remove                 = mtip_pci_remove,
4015         .driver.pm              = &mtip_pci_pm_ops,
4016         .shutdown               = mtip_pci_shutdown,
4017 };
4018
4019 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4020
4021 /*
4022  * Module initialization function.
4023  *
4024  * Called once when the module is loaded. This function allocates a major
4025  * block device number to the Cyclone devices and registers the PCI layer
4026  * of the driver.
4027  *
4028  * Return value
4029  *      0 on success else error code.
4030  */
4031 static int __init mtip_init(void)
4032 {
4033         int error;
4034
4035         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4036
4037         /* Allocate a major block device number to use with this driver. */
4038         error = register_blkdev(0, MTIP_DRV_NAME);
4039         if (error <= 0) {
4040                 pr_err("Unable to register block device (%d)\n",
4041                 error);
4042                 return -EBUSY;
4043         }
4044         mtip_major = error;
4045
4046         dfs_parent = debugfs_create_dir("rssd", NULL);
4047         if (IS_ERR_OR_NULL(dfs_parent)) {
4048                 pr_warn("Error creating debugfs parent\n");
4049                 dfs_parent = NULL;
4050         }
4051
4052         /* Register our PCI operations. */
4053         error = pci_register_driver(&mtip_pci_driver);
4054         if (error) {
4055                 debugfs_remove(dfs_parent);
4056                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4057         }
4058
4059         return error;
4060 }
4061
4062 /*
4063  * Module de-initialization function.
4064  *
4065  * Called once when the module is unloaded. This function deallocates
4066  * the major block device number allocated by mtip_init() and
4067  * unregisters the PCI layer of the driver.
4068  *
4069  * Return value
4070  *      none
4071  */
4072 static void __exit mtip_exit(void)
4073 {
4074         /* Release the allocated major block device number. */
4075         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4076
4077         /* Unregister the PCI driver. */
4078         pci_unregister_driver(&mtip_pci_driver);
4079
4080         debugfs_remove_recursive(dfs_parent);
4081 }
4082
4083 MODULE_AUTHOR("Micron Technology, Inc");
4084 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4085 MODULE_LICENSE("GPL");
4086 MODULE_VERSION(MTIP_DRV_VERSION);
4087
4088 module_init(mtip_init);
4089 module_exit(mtip_exit);