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/genhd.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/blk-mq.h>
  25 #include <linux/bio.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/idr.h>
  28 #include <linux/kthread.h>
  29 #include <../drivers/ata/ahci.h>
  30 #include <linux/export.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/prefetch.h>
  33 #include <linux/numa.h>
  34 #include "mtip32xx.h"
  35
  36 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  37
  38 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  39 #define AHCI_RX_FIS_SZ          0x100
  40 #define AHCI_RX_FIS_OFFSET      0x0
  41 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  42 #define AHCI_IDFY_OFFSET        0x400
  43 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  44 #define AHCI_SECTBUF_OFFSET     0x800
  45 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  46 #define AHCI_SMARTBUF_OFFSET    0xC00
  47 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  48 #define BLOCK_DMA_ALLOC_SZ      4096
  49
  50 /* DMA region containing command table (should be 8192 bytes) */
  51 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  52 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  53 #define AHCI_CMD_TBL_OFFSET     0x0
  54
  55 /* DMA region per command (contains header and SGL) */
  56 #define AHCI_CMD_TBL_HDR_SZ     0x80
  57 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  58 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  59 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  60 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  61
  62
  63 #define HOST_CAP_NZDMA          (1 << 19)
  64 #define HOST_HSORG              0xFC
  65 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  66 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  67 #define HSORG_HWREV             0xFF00
  68 #define HSORG_STYLE             0x8
  69 #define HSORG_SLOTGROUPS        0x7
  70
  71 #define PORT_COMMAND_ISSUE      0x38
  72 #define PORT_SDBV               0x7C
  73
  74 #define PORT_OFFSET             0x100
  75 #define PORT_MEM_SIZE           0x80
  76
  77 #define PORT_IRQ_ERR \
  78         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  79          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  80          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  81          PORT_IRQ_OVERFLOW)
  82 #define PORT_IRQ_LEGACY \
  83         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  84 #define PORT_IRQ_HANDLED \
  85         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  86          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  87          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  88 #define DEF_PORT_IRQ \
  89         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  90
  91 /* product numbers */
  92 #define MTIP_PRODUCT_UNKNOWN    0x00
  93 #define MTIP_PRODUCT_ASICFPGA   0x11
  94
  95 /* Device instance number, incremented each time a device is probed. */
  96 static int instance;
  97
  98 static LIST_HEAD(online_list);
  99 static LIST_HEAD(removing_list);
 100 static DEFINE_SPINLOCK(dev_lock);
 101
 102 /*
 103  * Global variable used to hold the major block device number
 104  * allocated in mtip_init().
 105  */
 106 static int mtip_major;
 107 static struct dentry *dfs_parent;
 108 static struct dentry *dfs_device_status;
 109
 110 static u32 cpu_use[NR_CPUS];
 111
 112 static DEFINE_IDA(rssd_index_ida);
 113
 114 static int mtip_block_initialize(struct driver_data *dd);
 115
 116 #ifdef CONFIG_COMPAT
 117 struct mtip_compat_ide_task_request_s {
 118         __u8            io_ports[8];
 119         __u8            hob_ports[8];
 120         ide_reg_valid_t out_flags;
 121         ide_reg_valid_t in_flags;
 122         int             data_phase;
 123         int             req_cmd;
 124         compat_ulong_t  out_size;
 125         compat_ulong_t  in_size;
 126 };
 127 #endif
 128
 129 /*
 130  * This function check_for_surprise_removal is called
 131  * while card is removed from the system and it will
 132  * read the vendor id from the configuration space
 133  *
 134  * @pdev Pointer to the pci_dev structure.
 135  *
 136  * return value
 137  *       true if device removed, else false
 138  */
 139 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 140 {
 141         u16 vendor_id = 0;
 142         struct driver_data *dd = pci_get_drvdata(pdev);
 143
 144         if (dd->sr)
 145                 return true;
 146
 147        /* Read the vendorID from the configuration space */
 148         pci_read_config_word(pdev, 0x00, &vendor_id);
 149         if (vendor_id == 0xFFFF) {
 150                 dd->sr = true;
 151                 if (dd->queue)
 152                         blk_queue_flag_set(QUEUE_FLAG_DEAD, dd->queue);
 153                 else
 154                         dev_warn(&dd->pdev->dev,
 155                                 "%s: dd->queue is NULL\n", __func__);
 156                 return true; /* device removed */
 157         }
 158
 159         return false; /* device present */
 160 }
 161
 162 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 163                                           unsigned int tag)
 164 {
 165         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 166
 167         return blk_mq_rq_to_pdu(blk_mq_tag_to_rq(hctx->tags, tag));
 168 }
 169
 170 /*
 171  * Reset the HBA (without sleeping)
 172  *
 173  * @dd Pointer to the driver data structure.
 174  *
 175  * return value
 176  *      0       The reset was successful.
 177  *      -1      The HBA Reset bit did not clear.
 178  */
 179 static int mtip_hba_reset(struct driver_data *dd)
 180 {
 181         unsigned long timeout;
 182
 183         /* Set the reset bit */
 184         writel(HOST_RESET, dd->mmio + HOST_CTL);
 185
 186         /* Flush */
 187         readl(dd->mmio + HOST_CTL);
 188
 189         /*
 190          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 191          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 192          */
 193         timeout = jiffies + msecs_to_jiffies(10000);
 194         do {
 195                 mdelay(10);
 196                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 197                         return -1;
 198
 199         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 200                  && time_before(jiffies, timeout));
 201
 202         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 203                 return -1;
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * Issue a command to the hardware.
 210  *
 211  * Set the appropriate bit in the s_active and Command Issue hardware
 212  * registers, causing hardware command processing to begin.
 213  *
 214  * @port Pointer to the port structure.
 215  * @tag  The tag of the command to be issued.
 216  *
 217  * return value
 218  *      None
 219  */
 220 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 221 {
 222         int group = tag >> 5;
 223
 224         /* guard SACT and CI registers */
 225         spin_lock(&port->cmd_issue_lock[group]);
 226         writel((1 << MTIP_TAG_BIT(tag)),
 227                         port->s_active[MTIP_TAG_INDEX(tag)]);
 228         writel((1 << MTIP_TAG_BIT(tag)),
 229                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 230         spin_unlock(&port->cmd_issue_lock[group]);
 231 }
 232
 233 /*
 234  * Enable/disable the reception of FIS
 235  *
 236  * @port   Pointer to the port data structure
 237  * @enable 1 to enable, 0 to disable
 238  *
 239  * return value
 240  *      Previous state: 1 enabled, 0 disabled
 241  */
 242 static int mtip_enable_fis(struct mtip_port *port, int enable)
 243 {
 244         u32 tmp;
 245
 246         /* enable FIS reception */
 247         tmp = readl(port->mmio + PORT_CMD);
 248         if (enable)
 249                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 250         else
 251                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 252
 253         /* Flush */
 254         readl(port->mmio + PORT_CMD);
 255
 256         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 257 }
 258
 259 /*
 260  * Enable/disable the DMA engine
 261  *
 262  * @port   Pointer to the port data structure
 263  * @enable 1 to enable, 0 to disable
 264  *
 265  * return value
 266  *      Previous state: 1 enabled, 0 disabled.
 267  */
 268 static int mtip_enable_engine(struct mtip_port *port, int enable)
 269 {
 270         u32 tmp;
 271
 272         /* enable FIS reception */
 273         tmp = readl(port->mmio + PORT_CMD);
 274         if (enable)
 275                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 276         else
 277                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 278
 279         readl(port->mmio + PORT_CMD);
 280         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 281 }
 282
 283 /*
 284  * Enables the port DMA engine and FIS reception.
 285  *
 286  * return value
 287  *      None
 288  */
 289 static inline void mtip_start_port(struct mtip_port *port)
 290 {
 291         /* Enable FIS reception */
 292         mtip_enable_fis(port, 1);
 293
 294         /* Enable the DMA engine */
 295         mtip_enable_engine(port, 1);
 296 }
 297
 298 /*
 299  * Deinitialize a port by disabling port interrupts, the DMA engine,
 300  * and FIS reception.
 301  *
 302  * @port Pointer to the port structure
 303  *
 304  * return value
 305  *      None
 306  */
 307 static inline void mtip_deinit_port(struct mtip_port *port)
 308 {
 309         /* Disable interrupts on this port */
 310         writel(0, port->mmio + PORT_IRQ_MASK);
 311
 312         /* Disable the DMA engine */
 313         mtip_enable_engine(port, 0);
 314
 315         /* Disable FIS reception */
 316         mtip_enable_fis(port, 0);
 317 }
 318
 319 /*
 320  * Initialize a port.
 321  *
 322  * This function deinitializes the port by calling mtip_deinit_port() and
 323  * then initializes it by setting the command header and RX FIS addresses,
 324  * clearing the SError register and any pending port interrupts before
 325  * re-enabling the default set of port interrupts.
 326  *
 327  * @port Pointer to the port structure.
 328  *
 329  * return value
 330  *      None
 331  */
 332 static void mtip_init_port(struct mtip_port *port)
 333 {
 334         int i;
 335         mtip_deinit_port(port);
 336
 337         /* Program the command list base and FIS base addresses */
 338         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 339                 writel((port->command_list_dma >> 16) >> 16,
 340                          port->mmio + PORT_LST_ADDR_HI);
 341                 writel((port->rxfis_dma >> 16) >> 16,
 342                          port->mmio + PORT_FIS_ADDR_HI);
 343                 set_bit(MTIP_PF_HOST_CAP_64, &port->flags);
 344         }
 345
 346         writel(port->command_list_dma & 0xFFFFFFFF,
 347                         port->mmio + PORT_LST_ADDR);
 348         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 349
 350         /* Clear SError */
 351         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 352
 353         /* reset the completed registers.*/
 354         for (i = 0; i < port->dd->slot_groups; i++)
 355                 writel(0xFFFFFFFF, port->completed[i]);
 356
 357         /* Clear any pending interrupts for this port */
 358         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 359
 360         /* Clear any pending interrupts on the HBA. */
 361         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 362                                         port->dd->mmio + HOST_IRQ_STAT);
 363
 364         /* Enable port interrupts */
 365         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 366 }
 367
 368 /*
 369  * Restart a port
 370  *
 371  * @port Pointer to the port data structure.
 372  *
 373  * return value
 374  *      None
 375  */
 376 static void mtip_restart_port(struct mtip_port *port)
 377 {
 378         unsigned long timeout;
 379
 380         /* Disable the DMA engine */
 381         mtip_enable_engine(port, 0);
 382
 383         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 384         timeout = jiffies + msecs_to_jiffies(500);
 385         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 386                  && time_before(jiffies, timeout))
 387                 ;
 388
 389         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 390                 return;
 391
 392         /*
 393          * Chip quirk: escalate to hba reset if
 394          * PxCMD.CR not clear after 500 ms
 395          */
 396         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 397                 dev_warn(&port->dd->pdev->dev,
 398                         "PxCMD.CR not clear, escalating reset\n");
 399
 400                 if (mtip_hba_reset(port->dd))
 401                         dev_err(&port->dd->pdev->dev,
 402                                 "HBA reset escalation failed.\n");
 403
 404                 /* 30 ms delay before com reset to quiesce chip */
 405                 mdelay(30);
 406         }
 407
 408         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 409
 410         /* Set PxSCTL.DET */
 411         writel(readl(port->mmio + PORT_SCR_CTL) |
 412                          1, port->mmio + PORT_SCR_CTL);
 413         readl(port->mmio + PORT_SCR_CTL);
 414
 415         /* Wait 1 ms to quiesce chip function */
 416         timeout = jiffies + msecs_to_jiffies(1);
 417         while (time_before(jiffies, timeout))
 418                 ;
 419
 420         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 421                 return;
 422
 423         /* Clear PxSCTL.DET */
 424         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 425                          port->mmio + PORT_SCR_CTL);
 426         readl(port->mmio + PORT_SCR_CTL);
 427
 428         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 429         timeout = jiffies + msecs_to_jiffies(500);
 430         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 431                          && time_before(jiffies, timeout))
 432                 ;
 433
 434         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 435                 return;
 436
 437         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 438                 dev_warn(&port->dd->pdev->dev,
 439                         "COM reset failed\n");
 440
 441         mtip_init_port(port);
 442         mtip_start_port(port);
 443
 444 }
 445
 446 static int mtip_device_reset(struct driver_data *dd)
 447 {
 448         int rv = 0;
 449
 450         if (mtip_check_surprise_removal(dd->pdev))
 451                 return 0;
 452
 453         if (mtip_hba_reset(dd) < 0)
 454                 rv = -EFAULT;
 455
 456         mdelay(1);
 457         mtip_init_port(dd->port);
 458         mtip_start_port(dd->port);
 459
 460         /* Enable interrupts on the HBA. */
 461         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 462                                         dd->mmio + HOST_CTL);
 463         return rv;
 464 }
 465
 466 /*
 467  * Helper function for tag logging
 468  */
 469 static void print_tags(struct driver_data *dd,
 470                         char *msg,
 471                         unsigned long *tagbits,
 472                         int cnt)
 473 {
 474         unsigned char tagmap[128];
 475         int group, tagmap_len = 0;
 476
 477         memset(tagmap, 0, sizeof(tagmap));
 478         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 479                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 480                                                 tagbits[group-1]);
 481         dev_warn(&dd->pdev->dev,
 482                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 483 }
 484
 485 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 486                                 dma_addr_t buffer_dma, unsigned int sectors);
 487 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 488                                                 struct smart_attr *attrib);
 489
 490 static void mtip_complete_command(struct mtip_cmd *cmd, blk_status_t status)
 491 {
 492         struct request *req = blk_mq_rq_from_pdu(cmd);
 493
 494         cmd->status = status;
 495         if (likely(!blk_should_fake_timeout(req->q)))
 496                 blk_mq_complete_request(req);
 497 }
 498
 499 /*
 500  * Handle an error.
 501  *
 502  * @dd Pointer to the DRIVER_DATA structure.
 503  *
 504  * return value
 505  *      None
 506  */
 507 static void mtip_handle_tfe(struct driver_data *dd)
 508 {
 509         int group, tag, bit, reissue, rv;
 510         struct mtip_port *port;
 511         struct mtip_cmd  *cmd;
 512         u32 completed;
 513         struct host_to_dev_fis *fis;
 514         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 515         unsigned int cmd_cnt = 0;
 516         unsigned char *buf;
 517         char *fail_reason = NULL;
 518         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 519
 520         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 521
 522         port = dd->port;
 523
 524         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 525                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 526                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 527                 mtip_complete_command(cmd, BLK_STS_IOERR);
 528                 return;
 529         }
 530
 531         /* clear the tag accumulator */
 532         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 533
 534         /* Loop through all the groups */
 535         for (group = 0; group < dd->slot_groups; group++) {
 536                 completed = readl(port->completed[group]);
 537
 538                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 539
 540                 /* clear completed status register in the hardware.*/
 541                 writel(completed, port->completed[group]);
 542
 543                 /* Process successfully completed commands */
 544                 for (bit = 0; bit < 32 && completed; bit++) {
 545                         if (!(completed & (1<<bit)))
 546                                 continue;
 547                         tag = (group << 5) + bit;
 548
 549                         /* Skip the internal command slot */
 550                         if (tag == MTIP_TAG_INTERNAL)
 551                                 continue;
 552
 553                         cmd = mtip_cmd_from_tag(dd, tag);
 554                         mtip_complete_command(cmd, 0);
 555                         set_bit(tag, tagaccum);
 556                         cmd_cnt++;
 557                 }
 558         }
 559
 560         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 561
 562         /* Restart the port */
 563         mdelay(20);
 564         mtip_restart_port(port);
 565
 566         /* Trying to determine the cause of the error */
 567         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 568                                 dd->port->log_buf,
 569                                 dd->port->log_buf_dma, 1);
 570         if (rv) {
 571                 dev_warn(&dd->pdev->dev,
 572                         "Error in READ LOG EXT (10h) command\n");
 573                 /* non-critical error, don't fail the load */
 574         } else {
 575                 buf = (unsigned char *)dd->port->log_buf;
 576                 if (buf[259] & 0x1) {
 577                         dev_info(&dd->pdev->dev,
 578                                 "Write protect bit is set.\n");
 579                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 580                         fail_all_ncq_write = 1;
 581                         fail_reason = "write protect";
 582                 }
 583                 if (buf[288] == 0xF7) {
 584                         dev_info(&dd->pdev->dev,
 585                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 586                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 587                         fail_all_ncq_cmds = 1;
 588                         fail_reason = "thermal shutdown";
 589                 }
 590                 if (buf[288] == 0xBF) {
 591                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 592                         dev_info(&dd->pdev->dev,
 593                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 594                         fail_all_ncq_cmds = 1;
 595                         fail_reason = "rebuild failed";
 596                 }
 597         }
 598
 599         /* clear the tag accumulator */
 600         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 601
 602         /* Loop through all the groups */
 603         for (group = 0; group < dd->slot_groups; group++) {
 604                 for (bit = 0; bit < 32; bit++) {
 605                         reissue = 1;
 606                         tag = (group << 5) + bit;
 607                         cmd = mtip_cmd_from_tag(dd, tag);
 608
 609                         fis = (struct host_to_dev_fis *)cmd->command;
 610
 611                         /* Should re-issue? */
 612                         if (tag == MTIP_TAG_INTERNAL ||
 613                             fis->command == ATA_CMD_SET_FEATURES)
 614                                 reissue = 0;
 615                         else {
 616                                 if (fail_all_ncq_cmds ||
 617                                         (fail_all_ncq_write &&
 618                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 619                                         dev_warn(&dd->pdev->dev,
 620                                         "  Fail: %s w/tag %d [%s].\n",
 621                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 622                                                 "write" : "read",
 623                                         tag,
 624                                         fail_reason != NULL ?
 625                                                 fail_reason : "unknown");
 626                                         mtip_complete_command(cmd, BLK_STS_MEDIUM);
 627                                         continue;
 628                                 }
 629                         }
 630
 631                         /*
 632                          * First check if this command has
 633                          *  exceeded its retries.
 634                          */
 635                         if (reissue && (cmd->retries-- > 0)) {
 636
 637                                 set_bit(tag, tagaccum);
 638
 639                                 /* Re-issue the command. */
 640                                 mtip_issue_ncq_command(port, tag);
 641
 642                                 continue;
 643                         }
 644
 645                         /* Retire a command that will not be reissued */
 646                         dev_warn(&port->dd->pdev->dev,
 647                                 "retiring tag %d\n", tag);
 648
 649                         mtip_complete_command(cmd, BLK_STS_IOERR);
 650                 }
 651         }
 652         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 653 }
 654
 655 /*
 656  * Handle a set device bits interrupt
 657  */
 658 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 659                                                         u32 completed)
 660 {
 661         struct driver_data *dd = port->dd;
 662         int tag, bit;
 663         struct mtip_cmd *command;
 664
 665         if (!completed) {
 666                 WARN_ON_ONCE(!completed);
 667                 return;
 668         }
 669         /* clear completed status register in the hardware.*/
 670         writel(completed, port->completed[group]);
 671
 672         /* Process completed commands. */
 673         for (bit = 0; (bit < 32) && completed; bit++) {
 674                 if (completed & 0x01) {
 675                         tag = (group << 5) | bit;
 676
 677                         /* skip internal command slot. */
 678                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 679                                 continue;
 680
 681                         command = mtip_cmd_from_tag(dd, tag);
 682                         mtip_complete_command(command, 0);
 683                 }
 684                 completed >>= 1;
 685         }
 686
 687         /* If last, re-enable interrupts */
 688         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 689                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 690 }
 691
 692 /*
 693  * Process legacy pio and d2h interrupts
 694  */
 695 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 696 {
 697         struct mtip_port *port = dd->port;
 698         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 699
 700         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) && cmd) {
 701                 int group = MTIP_TAG_INDEX(MTIP_TAG_INTERNAL);
 702                 int status = readl(port->cmd_issue[group]);
 703
 704                 if (!(status & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))))
 705                         mtip_complete_command(cmd, 0);
 706         }
 707 }
 708
 709 /*
 710  * Demux and handle errors
 711  */
 712 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 713 {
 714         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 715                 dev_warn(&dd->pdev->dev,
 716                         "Clearing PxSERR.DIAG.x\n");
 717                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 718         }
 719
 720         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 721                 dev_warn(&dd->pdev->dev,
 722                         "Clearing PxSERR.DIAG.n\n");
 723                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 724         }
 725
 726         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 727                 dev_warn(&dd->pdev->dev,
 728                         "Port stat errors %x unhandled\n",
 729                         (port_stat & ~PORT_IRQ_HANDLED));
 730                 if (mtip_check_surprise_removal(dd->pdev))
 731                         return;
 732         }
 733         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 734                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 735                 wake_up_interruptible(&dd->port->svc_wait);
 736         }
 737 }
 738
 739 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 740 {
 741         struct driver_data *dd = (struct driver_data *) data;
 742         struct mtip_port *port = dd->port;
 743         u32 hba_stat, port_stat;
 744         int rv = IRQ_NONE;
 745         int do_irq_enable = 1, i, workers;
 746         struct mtip_work *twork;
 747
 748         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 749         if (hba_stat) {
 750                 rv = IRQ_HANDLED;
 751
 752                 /* Acknowledge the interrupt status on the port.*/
 753                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 754                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 755                         mtip_check_surprise_removal(dd->pdev);
 756                         return IRQ_HANDLED;
 757                 }
 758                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 759
 760                 /* Demux port status */
 761                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 762                         do_irq_enable = 0;
 763                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 764
 765                         /* Start at 1: group zero is always local? */
 766                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 767                                                                         i++) {
 768                                 twork = &dd->work[i];
 769                                 twork->completed = readl(port->completed[i]);
 770                                 if (twork->completed)
 771                                         workers++;
 772                         }
 773
 774                         atomic_set(&dd->irq_workers_active, workers);
 775                         if (workers) {
 776                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 777                                         twork = &dd->work[i];
 778                                         if (twork->completed)
 779                                                 queue_work_on(
 780                                                         twork->cpu_binding,
 781                                                         dd->isr_workq,
 782                                                         &twork->work);
 783                                 }
 784
 785                                 if (likely(dd->work[0].completed))
 786                                         mtip_workq_sdbfx(port, 0,
 787                                                         dd->work[0].completed);
 788
 789                         } else {
 790                                 /*
 791                                  * Chip quirk: SDB interrupt but nothing
 792                                  * to complete
 793                                  */
 794                                 do_irq_enable = 1;
 795                         }
 796                 }
 797
 798                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 799                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 800                                 /* don't proceed further */
 801                                 return IRQ_HANDLED;
 802                         }
 803                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 804                                                         &dd->dd_flag))
 805                                 return rv;
 806
 807                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 808                 }
 809
 810                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 811                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 812         }
 813
 814         /* acknowledge interrupt */
 815         if (unlikely(do_irq_enable))
 816                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 817
 818         return rv;
 819 }
 820
 821 /*
 822  * HBA interrupt subroutine.
 823  *
 824  * @irq         IRQ number.
 825  * @instance    Pointer to the driver data structure.
 826  *
 827  * return value
 828  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 829  *      IRQ_NONE        This interrupt was not for the HBA.
 830  */
 831 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 832 {
 833         struct driver_data *dd = instance;
 834
 835         return mtip_handle_irq(dd);
 836 }
 837
 838 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 839 {
 840         writel(1 << MTIP_TAG_BIT(tag), port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 841 }
 842
 843 static bool mtip_pause_ncq(struct mtip_port *port,
 844                                 struct host_to_dev_fis *fis)
 845 {
 846         unsigned long task_file_data;
 847
 848         task_file_data = readl(port->mmio+PORT_TFDATA);
 849         if ((task_file_data & 1))
 850                 return false;
 851
 852         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 853                 port->ic_pause_timer = jiffies;
 854                 return true;
 855         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 856                                         (fis->features == 0x03)) {
 857                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 858                 port->ic_pause_timer = jiffies;
 859                 return true;
 860         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
 861                 ((fis->command == 0xFC) &&
 862                         (fis->features == 0x27 || fis->features == 0x72 ||
 863                          fis->features == 0x62 || fis->features == 0x26))) {
 864                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
 865                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
 866                 /* Com reset after secure erase or lowlevel format */
 867                 mtip_restart_port(port);
 868                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 869                 return false;
 870         }
 871
 872         return false;
 873 }
 874
 875 static bool mtip_commands_active(struct mtip_port *port)
 876 {
 877         unsigned int active;
 878         unsigned int n;
 879
 880         /*
 881          * Ignore s_active bit 0 of array element 0.
 882          * This bit will always be set
 883          */
 884         active = readl(port->s_active[0]) & 0xFFFFFFFE;
 885         for (n = 1; n < port->dd->slot_groups; n++)
 886                 active |= readl(port->s_active[n]);
 887
 888         return active != 0;
 889 }
 890
 891 /*
 892  * Wait for port to quiesce
 893  *
 894  * @port    Pointer to port data structure
 895  * @timeout Max duration to wait (ms)
 896  *
 897  * return value
 898  *      0       Success
 899  *      -EBUSY  Commands still active
 900  */
 901 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 902 {
 903         unsigned long to;
 904         bool active = true;
 905
 906         blk_mq_quiesce_queue(port->dd->queue);
 907
 908         to = jiffies + msecs_to_jiffies(timeout);
 909         do {
 910                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
 911                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
 912                         msleep(20);
 913                         continue; /* svc thd is actively issuing commands */
 914                 }
 915
 916                 msleep(100);
 917
 918                 if (mtip_check_surprise_removal(port->dd->pdev))
 919                         goto err_fault;
 920
 921                 active = mtip_commands_active(port);
 922                 if (!active)
 923                         break;
 924         } while (time_before(jiffies, to));
 925
 926         blk_mq_unquiesce_queue(port->dd->queue);
 927         return active ? -EBUSY : 0;
 928 err_fault:
 929         blk_mq_unquiesce_queue(port->dd->queue);
 930         return -EFAULT;
 931 }
 932
 933 struct mtip_int_cmd {
 934         int fis_len;
 935         dma_addr_t buffer;
 936         int buf_len;
 937         u32 opts;
 938 };
 939
 940 /*
 941  * Execute an internal command and wait for the completion.
 942  *
 943  * @port    Pointer to the port data structure.
 944  * @fis     Pointer to the FIS that describes the command.
 945  * @fis_len  Length in WORDS of the FIS.
 946  * @buffer  DMA accessible for command data.
 947  * @buf_len  Length, in bytes, of the data buffer.
 948  * @opts    Command header options, excluding the FIS length
 949  *             and the number of PRD entries.
 950  * @timeout Time in ms to wait for the command to complete.
 951  *
 952  * return value
 953  *      0        Command completed successfully.
 954  *      -EFAULT  The buffer address is not correctly aligned.
 955  *      -EBUSY   Internal command or other IO in progress.
 956  *      -EAGAIN  Time out waiting for command to complete.
 957  */
 958 static int mtip_exec_internal_command(struct mtip_port *port,
 959                                         struct host_to_dev_fis *fis,
 960                                         int fis_len,
 961                                         dma_addr_t buffer,
 962                                         int buf_len,
 963                                         u32 opts,
 964                                         unsigned long timeout)
 965 {
 966         struct mtip_cmd *int_cmd;
 967         struct driver_data *dd = port->dd;
 968         struct request *rq;
 969         struct mtip_int_cmd icmd = {
 970                 .fis_len = fis_len,
 971                 .buffer = buffer,
 972                 .buf_len = buf_len,
 973                 .opts = opts
 974         };
 975         int rv = 0;
 976
 977         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
 978         if (buffer & 0x00000007) {
 979                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
 980                 return -EFAULT;
 981         }
 982
 983         if (mtip_check_surprise_removal(dd->pdev))
 984                 return -EFAULT;
 985
 986         rq = blk_mq_alloc_request(dd->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED);
 987         if (IS_ERR(rq)) {
 988                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
 989                 return -EFAULT;
 990         }
 991
 992         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 993
 994         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
 995                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 996
 997         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 998
 999         if (fis->command != ATA_CMD_STANDBYNOW1) {
1000                 /* wait for io to complete if non atomic */
1001                 if (mtip_quiesce_io(port, MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
1002                         dev_warn(&dd->pdev->dev, "Failed to quiesce IO\n");
1003                         blk_mq_free_request(rq);
1004                         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1005                         wake_up_interruptible(&port->svc_wait);
1006                         return -EBUSY;
1007                 }
1008         }
1009
1010         /* Copy the command to the command table */
1011         int_cmd = blk_mq_rq_to_pdu(rq);
1012         int_cmd->icmd = &icmd;
1013         memcpy(int_cmd->command, fis, fis_len*4);
1014
1015         rq->timeout = timeout;
1016
1017         /* insert request and run queue */
1018         blk_execute_rq(NULL, rq, true);
1019
1020         if (int_cmd->status) {
1021                 dev_err(&dd->pdev->dev, "Internal command [%02X] failed %d\n",
1022                                 fis->command, int_cmd->status);
1023                 rv = -EIO;
1024
1025                 if (mtip_check_surprise_removal(dd->pdev) ||
1026                         test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1027                                         &dd->dd_flag)) {
1028                         dev_err(&dd->pdev->dev,
1029                                 "Internal command [%02X] wait returned due to SR\n",
1030                                 fis->command);
1031                         rv = -ENXIO;
1032                         goto exec_ic_exit;
1033                 }
1034                 mtip_device_reset(dd); /* recover from timeout issue */
1035                 rv = -EAGAIN;
1036                 goto exec_ic_exit;
1037         }
1038
1039         if (readl(port->cmd_issue[MTIP_TAG_INDEX(MTIP_TAG_INTERNAL)])
1040                         & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))) {
1041                 rv = -ENXIO;
1042                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1043                         mtip_device_reset(dd);
1044                         rv = -EAGAIN;
1045                 }
1046         }
1047 exec_ic_exit:
1048         /* Clear the allocated and active bits for the internal command. */
1049         blk_mq_free_request(rq);
1050         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1051         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1052                 /* NCQ paused */
1053                 return rv;
1054         }
1055         wake_up_interruptible(&port->svc_wait);
1056
1057         return rv;
1058 }
1059
1060 /*
1061  * Byte-swap ATA ID strings.
1062  *
1063  * ATA identify data contains strings in byte-swapped 16-bit words.
1064  * They must be swapped (on all architectures) to be usable as C strings.
1065  * This function swaps bytes in-place.
1066  *
1067  * @buf The buffer location of the string
1068  * @len The number of bytes to swap
1069  *
1070  * return value
1071  *      None
1072  */
1073 static inline void ata_swap_string(u16 *buf, unsigned int len)
1074 {
1075         int i;
1076         for (i = 0; i < (len/2); i++)
1077                 be16_to_cpus(&buf[i]);
1078 }
1079
1080 static void mtip_set_timeout(struct driver_data *dd,
1081                                         struct host_to_dev_fis *fis,
1082                                         unsigned int *timeout, u8 erasemode)
1083 {
1084         switch (fis->command) {
1085         case ATA_CMD_DOWNLOAD_MICRO:
1086                 *timeout = 120000; /* 2 minutes */
1087                 break;
1088         case ATA_CMD_SEC_ERASE_UNIT:
1089         case 0xFC:
1090                 if (erasemode)
1091                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1092                 else
1093                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1094                 break;
1095         case ATA_CMD_STANDBYNOW1:
1096                 *timeout = 120000;  /* 2 minutes */
1097                 break;
1098         case 0xF7:
1099         case 0xFA:
1100                 *timeout = 60000;  /* 60 seconds */
1101                 break;
1102         case ATA_CMD_SMART:
1103                 *timeout = 15000;  /* 15 seconds */
1104                 break;
1105         default:
1106                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1107                 break;
1108         }
1109 }
1110
1111 /*
1112  * Request the device identity information.
1113  *
1114  * If a user space buffer is not specified, i.e. is NULL, the
1115  * identify information is still read from the drive and placed
1116  * into the identify data buffer (@e port->identify) in the
1117  * port data structure.
1118  * When the identify buffer contains valid identify information @e
1119  * port->identify_valid is non-zero.
1120  *
1121  * @port         Pointer to the port structure.
1122  * @user_buffer  A user space buffer where the identify data should be
1123  *                    copied.
1124  *
1125  * return value
1126  *      0       Command completed successfully.
1127  *      -EFAULT An error occurred while coping data to the user buffer.
1128  *      -1      Command failed.
1129  */
1130 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1131 {
1132         int rv = 0;
1133         struct host_to_dev_fis fis;
1134
1135         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1136                 return -EFAULT;
1137
1138         /* Build the FIS. */
1139         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1140         fis.type        = 0x27;
1141         fis.opts        = 1 << 7;
1142         fis.command     = ATA_CMD_ID_ATA;
1143
1144         /* Set the identify information as invalid. */
1145         port->identify_valid = 0;
1146
1147         /* Clear the identify information. */
1148         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1149
1150         /* Execute the command. */
1151         if (mtip_exec_internal_command(port,
1152                                 &fis,
1153                                 5,
1154                                 port->identify_dma,
1155                                 sizeof(u16) * ATA_ID_WORDS,
1156                                 0,
1157                                 MTIP_INT_CMD_TIMEOUT_MS)
1158                                 < 0) {
1159                 rv = -1;
1160                 goto out;
1161         }
1162
1163         /*
1164          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1165          * perform field-sensitive swapping on the string fields.
1166          * See the kernel use of ata_id_string() for proof of this.
1167          */
1168 #ifdef __LITTLE_ENDIAN
1169         ata_swap_string(port->identify + 27, 40);  /* model string*/
1170         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1171         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1172 #else
1173         {
1174                 int i;
1175                 for (i = 0; i < ATA_ID_WORDS; i++)
1176                         port->identify[i] = le16_to_cpu(port->identify[i]);
1177         }
1178 #endif
1179
1180         /* Check security locked state */
1181         if (port->identify[128] & 0x4)
1182                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1183         else
1184                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1185
1186         /* Set the identify buffer as valid. */
1187         port->identify_valid = 1;
1188
1189         if (user_buffer) {
1190                 if (copy_to_user(
1191                         user_buffer,
1192                         port->identify,
1193                         ATA_ID_WORDS * sizeof(u16))) {
1194                         rv = -EFAULT;
1195                         goto out;
1196                 }
1197         }
1198
1199 out:
1200         return rv;
1201 }
1202
1203 /*
1204  * Issue a standby immediate command to the device.
1205  *
1206  * @port Pointer to the port structure.
1207  *
1208  * return value
1209  *      0       Command was executed successfully.
1210  *      -1      An error occurred while executing the command.
1211  */
1212 static int mtip_standby_immediate(struct mtip_port *port)
1213 {
1214         int rv;
1215         struct host_to_dev_fis  fis;
1216         unsigned long __maybe_unused start;
1217         unsigned int timeout;
1218
1219         /* Build the FIS. */
1220         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1221         fis.type        = 0x27;
1222         fis.opts        = 1 << 7;
1223         fis.command     = ATA_CMD_STANDBYNOW1;
1224
1225         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1226
1227         start = jiffies;
1228         rv = mtip_exec_internal_command(port,
1229                                         &fis,
1230                                         5,
1231                                         0,
1232                                         0,
1233                                         0,
1234                                         timeout);
1235         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1236                         jiffies_to_msecs(jiffies - start));
1237         if (rv)
1238                 dev_warn(&port->dd->pdev->dev,
1239                         "STANDBY IMMEDIATE command failed.\n");
1240
1241         return rv;
1242 }
1243
1244 /*
1245  * Issue a READ LOG EXT command to the device.
1246  *
1247  * @port        pointer to the port structure.
1248  * @page        page number to fetch
1249  * @buffer      pointer to buffer
1250  * @buffer_dma  dma address corresponding to @buffer
1251  * @sectors     page length to fetch, in sectors
1252  *
1253  * return value
1254  *      @rv     return value from mtip_exec_internal_command()
1255  */
1256 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1257                                 dma_addr_t buffer_dma, unsigned int sectors)
1258 {
1259         struct host_to_dev_fis fis;
1260
1261         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1262         fis.type        = 0x27;
1263         fis.opts        = 1 << 7;
1264         fis.command     = ATA_CMD_READ_LOG_EXT;
1265         fis.sect_count  = sectors & 0xFF;
1266         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1267         fis.lba_low     = page;
1268         fis.lba_mid     = 0;
1269         fis.device      = ATA_DEVICE_OBS;
1270
1271         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1272
1273         return mtip_exec_internal_command(port,
1274                                         &fis,
1275                                         5,
1276                                         buffer_dma,
1277                                         sectors * ATA_SECT_SIZE,
1278                                         0,
1279                                         MTIP_INT_CMD_TIMEOUT_MS);
1280 }
1281
1282 /*
1283  * Issue a SMART READ DATA command to the device.
1284  *
1285  * @port        pointer to the port structure.
1286  * @buffer      pointer to buffer
1287  * @buffer_dma  dma address corresponding to @buffer
1288  *
1289  * return value
1290  *      @rv     return value from mtip_exec_internal_command()
1291  */
1292 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1293                                         dma_addr_t buffer_dma)
1294 {
1295         struct host_to_dev_fis fis;
1296
1297         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1298         fis.type        = 0x27;
1299         fis.opts        = 1 << 7;
1300         fis.command     = ATA_CMD_SMART;
1301         fis.features    = 0xD0;
1302         fis.sect_count  = 1;
1303         fis.lba_mid     = 0x4F;
1304         fis.lba_hi      = 0xC2;
1305         fis.device      = ATA_DEVICE_OBS;
1306
1307         return mtip_exec_internal_command(port,
1308                                         &fis,
1309                                         5,
1310                                         buffer_dma,
1311                                         ATA_SECT_SIZE,
1312                                         0,
1313                                         15000);
1314 }
1315
1316 /*
1317  * Get the value of a smart attribute
1318  *
1319  * @port        pointer to the port structure
1320  * @id          attribute number
1321  * @attrib      pointer to return attrib information corresponding to @id
1322  *
1323  * return value
1324  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1325  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1326  */
1327 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1328                                                 struct smart_attr *attrib)
1329 {
1330         int rv, i;
1331         struct smart_attr *pattr;
1332
1333         if (!attrib)
1334                 return -EINVAL;
1335
1336         if (!port->identify_valid) {
1337                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1338                 return -EPERM;
1339         }
1340         if (!(port->identify[82] & 0x1)) {
1341                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1342                 return -EPERM;
1343         }
1344         if (!(port->identify[85] & 0x1)) {
1345                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1346                 return -EPERM;
1347         }
1348
1349         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1350         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1351         if (rv) {
1352                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1353                 return rv;
1354         }
1355
1356         pattr = (struct smart_attr *)(port->smart_buf + 2);
1357         for (i = 0; i < 29; i++, pattr++)
1358                 if (pattr->attr_id == id) {
1359                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1360                         break;
1361                 }
1362
1363         if (i == 29) {
1364                 dev_warn(&port->dd->pdev->dev,
1365                         "Query for invalid SMART attribute ID\n");
1366                 rv = -EINVAL;
1367         }
1368
1369         return rv;
1370 }
1371
1372 /*
1373  * Get the drive capacity.
1374  *
1375  * @dd      Pointer to the device data structure.
1376  * @sectors Pointer to the variable that will receive the sector count.
1377  *
1378  * return value
1379  *      1 Capacity was returned successfully.
1380  *      0 The identify information is invalid.
1381  */
1382 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1383 {
1384         struct mtip_port *port = dd->port;
1385         u64 total, raw0, raw1, raw2, raw3;
1386         raw0 = port->identify[100];
1387         raw1 = port->identify[101];
1388         raw2 = port->identify[102];
1389         raw3 = port->identify[103];
1390         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1391         *sectors = total;
1392         return (bool) !!port->identify_valid;
1393 }
1394
1395 /*
1396  * Display the identify command data.
1397  *
1398  * @port Pointer to the port data structure.
1399  *
1400  * return value
1401  *      None
1402  */
1403 static void mtip_dump_identify(struct mtip_port *port)
1404 {
1405         sector_t sectors;
1406         unsigned short revid;
1407         char cbuf[42];
1408
1409         if (!port->identify_valid)
1410                 return;
1411
1412         strlcpy(cbuf, (char *)(port->identify+10), 21);
1413         dev_info(&port->dd->pdev->dev,
1414                 "Serial No.: %s\n", cbuf);
1415
1416         strlcpy(cbuf, (char *)(port->identify+23), 9);
1417         dev_info(&port->dd->pdev->dev,
1418                 "Firmware Ver.: %s\n", cbuf);
1419
1420         strlcpy(cbuf, (char *)(port->identify+27), 41);
1421         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1422
1423         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1424                 port->identify[128],
1425                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1426
1427         if (mtip_hw_get_capacity(port->dd, &sectors))
1428                 dev_info(&port->dd->pdev->dev,
1429                         "Capacity: %llu sectors (%llu MB)\n",
1430                          (u64)sectors,
1431                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1432
1433         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1434         switch (revid & 0xFF) {
1435         case 0x1:
1436                 strlcpy(cbuf, "A0", 3);
1437                 break;
1438         case 0x3:
1439                 strlcpy(cbuf, "A2", 3);
1440                 break;
1441         default:
1442                 strlcpy(cbuf, "?", 2);
1443                 break;
1444         }
1445         dev_info(&port->dd->pdev->dev,
1446                 "Card Type: %s\n", cbuf);
1447 }
1448
1449 /*
1450  * Map the commands scatter list into the command table.
1451  *
1452  * @command Pointer to the command.
1453  * @nents Number of scatter list entries.
1454  *
1455  * return value
1456  *      None
1457  */
1458 static inline void fill_command_sg(struct driver_data *dd,
1459                                 struct mtip_cmd *command,
1460                                 int nents)
1461 {
1462         int n;
1463         unsigned int dma_len;
1464         struct mtip_cmd_sg *command_sg;
1465         struct scatterlist *sg;
1466
1467         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1468
1469         for_each_sg(command->sg, sg, nents, n) {
1470                 dma_len = sg_dma_len(sg);
1471                 if (dma_len > 0x400000)
1472                         dev_err(&dd->pdev->dev,
1473                                 "DMA segment length truncated\n");
1474                 command_sg->info = cpu_to_le32((dma_len-1) & 0x3FFFFF);
1475                 command_sg->dba =  cpu_to_le32(sg_dma_address(sg));
1476                 command_sg->dba_upper =
1477                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1478                 command_sg++;
1479         }
1480 }
1481
1482 /*
1483  * @brief Execute a drive command.
1484  *
1485  * return value 0 The command completed successfully.
1486  * return value -1 An error occurred while executing the command.
1487  */
1488 static int exec_drive_task(struct mtip_port *port, u8 *command)
1489 {
1490         struct host_to_dev_fis  fis;
1491         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1492         unsigned int to;
1493
1494         /* Build the FIS. */
1495         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1496         fis.type        = 0x27;
1497         fis.opts        = 1 << 7;
1498         fis.command     = command[0];
1499         fis.features    = command[1];
1500         fis.sect_count  = command[2];
1501         fis.sector      = command[3];
1502         fis.cyl_low     = command[4];
1503         fis.cyl_hi      = command[5];
1504         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1505
1506         mtip_set_timeout(port->dd, &fis, &to, 0);
1507
1508         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1509                 __func__,
1510                 command[0],
1511                 command[1],
1512                 command[2],
1513                 command[3],
1514                 command[4],
1515                 command[5],
1516                 command[6]);
1517
1518         /* Execute the command. */
1519         if (mtip_exec_internal_command(port,
1520                                  &fis,
1521                                  5,
1522                                  0,
1523                                  0,
1524                                  0,
1525                                  to) < 0) {
1526                 return -1;
1527         }
1528
1529         command[0] = reply->command; /* Status*/
1530         command[1] = reply->features; /* Error*/
1531         command[4] = reply->cyl_low;
1532         command[5] = reply->cyl_hi;
1533
1534         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1535                 __func__,
1536                 command[0],
1537                 command[1],
1538                 command[4],
1539                 command[5]);
1540
1541         return 0;
1542 }
1543
1544 /*
1545  * @brief Execute a drive command.
1546  *
1547  * @param port Pointer to the port data structure.
1548  * @param command Pointer to the user specified command parameters.
1549  * @param user_buffer Pointer to the user space buffer where read sector
1550  *                   data should be copied.
1551  *
1552  * return value 0 The command completed successfully.
1553  * return value -EFAULT An error occurred while copying the completion
1554  *                 data to the user space buffer.
1555  * return value -1 An error occurred while executing the command.
1556  */
1557 static int exec_drive_command(struct mtip_port *port, u8 *command,
1558                                 void __user *user_buffer)
1559 {
1560         struct host_to_dev_fis  fis;
1561         struct host_to_dev_fis *reply;
1562         u8 *buf = NULL;
1563         dma_addr_t dma_addr = 0;
1564         int rv = 0, xfer_sz = command[3];
1565         unsigned int to;
1566
1567         if (xfer_sz) {
1568                 if (!user_buffer)
1569                         return -EFAULT;
1570
1571                 buf = dma_alloc_coherent(&port->dd->pdev->dev,
1572                                 ATA_SECT_SIZE * xfer_sz,
1573                                 &dma_addr,
1574                                 GFP_KERNEL);
1575                 if (!buf) {
1576                         dev_err(&port->dd->pdev->dev,
1577                                 "Memory allocation failed (%d bytes)\n",
1578                                 ATA_SECT_SIZE * xfer_sz);
1579                         return -ENOMEM;
1580                 }
1581         }
1582
1583         /* Build the FIS. */
1584         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1585         fis.type        = 0x27;
1586         fis.opts        = 1 << 7;
1587         fis.command     = command[0];
1588         fis.features    = command[2];
1589         fis.sect_count  = command[3];
1590         if (fis.command == ATA_CMD_SMART) {
1591                 fis.sector      = command[1];
1592                 fis.cyl_low     = 0x4F;
1593                 fis.cyl_hi      = 0xC2;
1594         }
1595
1596         mtip_set_timeout(port->dd, &fis, &to, 0);
1597
1598         if (xfer_sz)
1599                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1600         else
1601                 reply = (port->rxfis + RX_FIS_D2H_REG);
1602
1603         dbg_printk(MTIP_DRV_NAME
1604                 " %s: User Command: cmd %x, sect %x, "
1605                 "feat %x, sectcnt %x\n",
1606                 __func__,
1607                 command[0],
1608                 command[1],
1609                 command[2],
1610                 command[3]);
1611
1612         /* Execute the command. */
1613         if (mtip_exec_internal_command(port,
1614                                 &fis,
1615                                  5,
1616                                  (xfer_sz ? dma_addr : 0),
1617                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1618                                  0,
1619                                  to)
1620                                  < 0) {
1621                 rv = -EFAULT;
1622                 goto exit_drive_command;
1623         }
1624
1625         /* Collect the completion status. */
1626         command[0] = reply->command; /* Status*/
1627         command[1] = reply->features; /* Error*/
1628         command[2] = reply->sect_count;
1629
1630         dbg_printk(MTIP_DRV_NAME
1631                 " %s: Completion Status: stat %x, "
1632                 "err %x, nsect %x\n",
1633                 __func__,
1634                 command[0],
1635                 command[1],
1636                 command[2]);
1637
1638         if (xfer_sz) {
1639                 if (copy_to_user(user_buffer,
1640                                  buf,
1641                                  ATA_SECT_SIZE * command[3])) {
1642                         rv = -EFAULT;
1643                         goto exit_drive_command;
1644                 }
1645         }
1646 exit_drive_command:
1647         if (buf)
1648                 dma_free_coherent(&port->dd->pdev->dev,
1649                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1650         return rv;
1651 }
1652
1653 /*
1654  *  Indicates whether a command has a single sector payload.
1655  *
1656  *  @command passed to the device to perform the certain event.
1657  *  @features passed to the device to perform the certain event.
1658  *
1659  *  return value
1660  *      1       command is one that always has a single sector payload,
1661  *              regardless of the value in the Sector Count field.
1662  *      0       otherwise
1663  *
1664  */
1665 static unsigned int implicit_sector(unsigned char command,
1666                                     unsigned char features)
1667 {
1668         unsigned int rv = 0;
1669
1670         /* list of commands that have an implicit sector count of 1 */
1671         switch (command) {
1672         case ATA_CMD_SEC_SET_PASS:
1673         case ATA_CMD_SEC_UNLOCK:
1674         case ATA_CMD_SEC_ERASE_PREP:
1675         case ATA_CMD_SEC_ERASE_UNIT:
1676         case ATA_CMD_SEC_FREEZE_LOCK:
1677         case ATA_CMD_SEC_DISABLE_PASS:
1678         case ATA_CMD_PMP_READ:
1679         case ATA_CMD_PMP_WRITE:
1680                 rv = 1;
1681                 break;
1682         case ATA_CMD_SET_MAX:
1683                 if (features == ATA_SET_MAX_UNLOCK)
1684                         rv = 1;
1685                 break;
1686         case ATA_CMD_SMART:
1687                 if ((features == ATA_SMART_READ_VALUES) ||
1688                                 (features == ATA_SMART_READ_THRESHOLDS))
1689                         rv = 1;
1690                 break;
1691         case ATA_CMD_CONF_OVERLAY:
1692                 if ((features == ATA_DCO_IDENTIFY) ||
1693                                 (features == ATA_DCO_SET))
1694                         rv = 1;
1695                 break;
1696         }
1697         return rv;
1698 }
1699
1700 /*
1701  * Executes a taskfile
1702  * See ide_taskfile_ioctl() for derivation
1703  */
1704 static int exec_drive_taskfile(struct driver_data *dd,
1705                                void __user *buf,
1706                                ide_task_request_t *req_task,
1707                                int outtotal)
1708 {
1709         struct host_to_dev_fis  fis;
1710         struct host_to_dev_fis *reply;
1711         u8 *outbuf = NULL;
1712         u8 *inbuf = NULL;
1713         dma_addr_t outbuf_dma = 0;
1714         dma_addr_t inbuf_dma = 0;
1715         dma_addr_t dma_buffer = 0;
1716         int err = 0;
1717         unsigned int taskin = 0;
1718         unsigned int taskout = 0;
1719         u8 nsect = 0;
1720         unsigned int timeout;
1721         unsigned int force_single_sector;
1722         unsigned int transfer_size;
1723         unsigned long task_file_data;
1724         int intotal = outtotal + req_task->out_size;
1725         int erasemode = 0;
1726
1727         taskout = req_task->out_size;
1728         taskin = req_task->in_size;
1729         /* 130560 = 512 * 0xFF*/
1730         if (taskin > 130560 || taskout > 130560)
1731                 return -EINVAL;
1732
1733         if (taskout) {
1734                 outbuf = memdup_user(buf + outtotal, taskout);
1735                 if (IS_ERR(outbuf))
1736                         return PTR_ERR(outbuf);
1737
1738                 outbuf_dma = dma_map_single(&dd->pdev->dev, outbuf,
1739                                             taskout, DMA_TO_DEVICE);
1740                 if (dma_mapping_error(&dd->pdev->dev, outbuf_dma)) {
1741                         err = -ENOMEM;
1742                         goto abort;
1743                 }
1744                 dma_buffer = outbuf_dma;
1745         }
1746
1747         if (taskin) {
1748                 inbuf = memdup_user(buf + intotal, taskin);
1749                 if (IS_ERR(inbuf)) {
1750                         err = PTR_ERR(inbuf);
1751                         inbuf = NULL;
1752                         goto abort;
1753                 }
1754                 inbuf_dma = dma_map_single(&dd->pdev->dev, inbuf,
1755                                            taskin, DMA_FROM_DEVICE);
1756                 if (dma_mapping_error(&dd->pdev->dev, inbuf_dma)) {
1757                         err = -ENOMEM;
1758                         goto abort;
1759                 }
1760                 dma_buffer = inbuf_dma;
1761         }
1762
1763         /* only supports PIO and non-data commands from this ioctl. */
1764         switch (req_task->data_phase) {
1765         case TASKFILE_OUT:
1766                 nsect = taskout / ATA_SECT_SIZE;
1767                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1768                 break;
1769         case TASKFILE_IN:
1770                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1771                 break;
1772         case TASKFILE_NO_DATA:
1773                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1774                 break;
1775         default:
1776                 err = -EINVAL;
1777                 goto abort;
1778         }
1779
1780         /* Build the FIS. */
1781         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1782
1783         fis.type        = 0x27;
1784         fis.opts        = 1 << 7;
1785         fis.command     = req_task->io_ports[7];
1786         fis.features    = req_task->io_ports[1];
1787         fis.sect_count  = req_task->io_ports[2];
1788         fis.lba_low     = req_task->io_ports[3];
1789         fis.lba_mid     = req_task->io_ports[4];
1790         fis.lba_hi      = req_task->io_ports[5];
1791          /* Clear the dev bit*/
1792         fis.device      = req_task->io_ports[6] & ~0x10;
1793
1794         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1795                 req_task->in_flags.all  =
1796                         IDE_TASKFILE_STD_IN_FLAGS |
1797                         (IDE_HOB_STD_IN_FLAGS << 8);
1798                 fis.lba_low_ex          = req_task->hob_ports[3];
1799                 fis.lba_mid_ex          = req_task->hob_ports[4];
1800                 fis.lba_hi_ex           = req_task->hob_ports[5];
1801                 fis.features_ex         = req_task->hob_ports[1];
1802                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1803
1804         } else {
1805                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1806         }
1807
1808         force_single_sector = implicit_sector(fis.command, fis.features);
1809
1810         if ((taskin || taskout) && (!fis.sect_count)) {
1811                 if (nsect)
1812                         fis.sect_count = nsect;
1813                 else {
1814                         if (!force_single_sector) {
1815                                 dev_warn(&dd->pdev->dev,
1816                                         "data movement but "
1817                                         "sect_count is 0\n");
1818                                 err = -EINVAL;
1819                                 goto abort;
1820                         }
1821                 }
1822         }
1823
1824         dbg_printk(MTIP_DRV_NAME
1825                 " %s: cmd %x, feat %x, nsect %x,"
1826                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1827                 " head/dev %x\n",
1828                 __func__,
1829                 fis.command,
1830                 fis.features,
1831                 fis.sect_count,
1832                 fis.lba_low,
1833                 fis.lba_mid,
1834                 fis.lba_hi,
1835                 fis.device);
1836
1837         /* check for erase mode support during secure erase.*/
1838         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
1839                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
1840                 erasemode = 1;
1841         }
1842
1843         mtip_set_timeout(dd, &fis, &timeout, erasemode);
1844
1845         /* Determine the correct transfer size.*/
1846         if (force_single_sector)
1847                 transfer_size = ATA_SECT_SIZE;
1848         else
1849                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1850
1851         /* Execute the command.*/
1852         if (mtip_exec_internal_command(dd->port,
1853                                  &fis,
1854                                  5,
1855                                  dma_buffer,
1856                                  transfer_size,
1857                                  0,
1858                                  timeout) < 0) {
1859                 err = -EIO;
1860                 goto abort;
1861         }
1862
1863         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1864
1865         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1866                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1867                 req_task->io_ports[7] = reply->control;
1868         } else {
1869                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
1870                 req_task->io_ports[7] = reply->command;
1871         }
1872
1873         /* reclaim the DMA buffers.*/
1874         if (inbuf_dma)
1875                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1876                                  DMA_FROM_DEVICE);
1877         if (outbuf_dma)
1878                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1879                                  DMA_TO_DEVICE);
1880         inbuf_dma  = 0;
1881         outbuf_dma = 0;
1882
1883         /* return the ATA registers to the caller.*/
1884         req_task->io_ports[1] = reply->features;
1885         req_task->io_ports[2] = reply->sect_count;
1886         req_task->io_ports[3] = reply->lba_low;
1887         req_task->io_ports[4] = reply->lba_mid;
1888         req_task->io_ports[5] = reply->lba_hi;
1889         req_task->io_ports[6] = reply->device;
1890
1891         if (req_task->out_flags.all & 1)  {
1892
1893                 req_task->hob_ports[3] = reply->lba_low_ex;
1894                 req_task->hob_ports[4] = reply->lba_mid_ex;
1895                 req_task->hob_ports[5] = reply->lba_hi_ex;
1896                 req_task->hob_ports[1] = reply->features_ex;
1897                 req_task->hob_ports[2] = reply->sect_cnt_ex;
1898         }
1899         dbg_printk(MTIP_DRV_NAME
1900                 " %s: Completion: stat %x,"
1901                 "err %x, sect_cnt %x, lbalo %x,"
1902                 "lbamid %x, lbahi %x, dev %x\n",
1903                 __func__,
1904                 req_task->io_ports[7],
1905                 req_task->io_ports[1],
1906                 req_task->io_ports[2],
1907                 req_task->io_ports[3],
1908                 req_task->io_ports[4],
1909                 req_task->io_ports[5],
1910                 req_task->io_ports[6]);
1911
1912         if (taskout) {
1913                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
1914                         err = -EFAULT;
1915                         goto abort;
1916                 }
1917         }
1918         if (taskin) {
1919                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
1920                         err = -EFAULT;
1921                         goto abort;
1922                 }
1923         }
1924 abort:
1925         if (inbuf_dma)
1926                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1927                                  DMA_FROM_DEVICE);
1928         if (outbuf_dma)
1929                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1930                                  DMA_TO_DEVICE);
1931         kfree(outbuf);
1932         kfree(inbuf);
1933
1934         return err;
1935 }
1936
1937 /*
1938  * Handle IOCTL calls from the Block Layer.
1939  *
1940  * This function is called by the Block Layer when it receives an IOCTL
1941  * command that it does not understand. If the IOCTL command is not supported
1942  * this function returns -ENOTTY.
1943  *
1944  * @dd  Pointer to the driver data structure.
1945  * @cmd IOCTL command passed from the Block Layer.
1946  * @arg IOCTL argument passed from the Block Layer.
1947  *
1948  * return value
1949  *      0       The IOCTL completed successfully.
1950  *      -ENOTTY The specified command is not supported.
1951  *      -EFAULT An error occurred copying data to a user space buffer.
1952  *      -EIO    An error occurred while executing the command.
1953  */
1954 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
1955                          unsigned long arg)
1956 {
1957         switch (cmd) {
1958         case HDIO_GET_IDENTITY:
1959         {
1960                 if (copy_to_user((void __user *)arg, dd->port->identify,
1961                                                 sizeof(u16) * ATA_ID_WORDS))
1962                         return -EFAULT;
1963                 break;
1964         }
1965         case HDIO_DRIVE_CMD:
1966         {
1967                 u8 drive_command[4];
1968
1969                 /* Copy the user command info to our buffer. */
1970                 if (copy_from_user(drive_command,
1971                                          (void __user *) arg,
1972                                          sizeof(drive_command)))
1973                         return -EFAULT;
1974
1975                 /* Execute the drive command. */
1976                 if (exec_drive_command(dd->port,
1977                                          drive_command,
1978                                          (void __user *) (arg+4)))
1979                         return -EIO;
1980
1981                 /* Copy the status back to the users buffer. */
1982                 if (copy_to_user((void __user *) arg,
1983                                          drive_command,
1984                                          sizeof(drive_command)))
1985                         return -EFAULT;
1986
1987                 break;
1988         }
1989         case HDIO_DRIVE_TASK:
1990         {
1991                 u8 drive_command[7];
1992
1993                 /* Copy the user command info to our buffer. */
1994                 if (copy_from_user(drive_command,
1995                                          (void __user *) arg,
1996                                          sizeof(drive_command)))
1997                         return -EFAULT;
1998
1999                 /* Execute the drive command. */
2000                 if (exec_drive_task(dd->port, drive_command))
2001                         return -EIO;
2002
2003                 /* Copy the status back to the users buffer. */
2004                 if (copy_to_user((void __user *) arg,
2005                                          drive_command,
2006                                          sizeof(drive_command)))
2007                         return -EFAULT;
2008
2009                 break;
2010         }
2011         case HDIO_DRIVE_TASKFILE: {
2012                 ide_task_request_t req_task;
2013                 int ret, outtotal;
2014
2015                 if (copy_from_user(&req_task, (void __user *) arg,
2016                                         sizeof(req_task)))
2017                         return -EFAULT;
2018
2019                 outtotal = sizeof(req_task);
2020
2021                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2022                                                 &req_task, outtotal);
2023
2024                 if (copy_to_user((void __user *) arg, &req_task,
2025                                                         sizeof(req_task)))
2026                         return -EFAULT;
2027
2028                 return ret;
2029         }
2030
2031         default:
2032                 return -EINVAL;
2033         }
2034         return 0;
2035 }
2036
2037 /*
2038  * Submit an IO to the hw
2039  *
2040  * This function is called by the block layer to issue an io
2041  * to the device. Upon completion, the callback function will
2042  * be called with the data parameter passed as the callback data.
2043  *
2044  * @dd       Pointer to the driver data structure.
2045  * @start    First sector to read.
2046  * @nsect    Number of sectors to read.
2047  * @tag      The tag of this read command.
2048  * @callback Pointer to the function that should be called
2049  *           when the read completes.
2050  * @data     Callback data passed to the callback function
2051  *           when the read completes.
2052  * @dir      Direction (read or write)
2053  *
2054  * return value
2055  *      None
2056  */
2057 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2058                               struct mtip_cmd *command,
2059                               struct blk_mq_hw_ctx *hctx)
2060 {
2061         struct mtip_cmd_hdr *hdr =
2062                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
2063         struct host_to_dev_fis  *fis;
2064         struct mtip_port *port = dd->port;
2065         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2066         u64 start = blk_rq_pos(rq);
2067         unsigned int nsect = blk_rq_sectors(rq);
2068         unsigned int nents;
2069
2070         /* Map the scatter list for DMA access */
2071         nents = blk_rq_map_sg(hctx->queue, rq, command->sg);
2072         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2073
2074         prefetch(&port->flags);
2075
2076         command->scatter_ents = nents;
2077
2078         /*
2079          * The number of retries for this command before it is
2080          * reported as a failure to the upper layers.
2081          */
2082         command->retries = MTIP_MAX_RETRIES;
2083
2084         /* Fill out fis */
2085         fis = command->command;
2086         fis->type        = 0x27;
2087         fis->opts        = 1 << 7;
2088         if (dma_dir == DMA_FROM_DEVICE)
2089                 fis->command = ATA_CMD_FPDMA_READ;
2090         else
2091                 fis->command = ATA_CMD_FPDMA_WRITE;
2092         fis->lba_low     = start & 0xFF;
2093         fis->lba_mid     = (start >> 8) & 0xFF;
2094         fis->lba_hi      = (start >> 16) & 0xFF;
2095         fis->lba_low_ex  = (start >> 24) & 0xFF;
2096         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2097         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2098         fis->device      = 1 << 6;
2099         fis->features    = nsect & 0xFF;
2100         fis->features_ex = (nsect >> 8) & 0xFF;
2101         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2102         fis->sect_cnt_ex = 0;
2103         fis->control     = 0;
2104         fis->res2        = 0;
2105         fis->res3        = 0;
2106         fill_command_sg(dd, command, nents);
2107
2108         if (unlikely(command->unaligned))
2109                 fis->device |= 1 << 7;
2110
2111         /* Populate the command header */
2112         hdr->ctba = cpu_to_le32(command->command_dma & 0xFFFFFFFF);
2113         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
2114                 hdr->ctbau = cpu_to_le32((command->command_dma >> 16) >> 16);
2115         hdr->opts = cpu_to_le32((nents << 16) | 5 | AHCI_CMD_PREFETCH);
2116         hdr->byte_count = 0;
2117
2118         command->direction = dma_dir;
2119
2120         /*
2121          * To prevent this command from being issued
2122          * if an internal command is in progress or error handling is active.
2123          */
2124         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2125                 set_bit(rq->tag, port->cmds_to_issue);
2126                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2127                 return;
2128         }
2129
2130         /* Issue the command to the hardware */
2131         mtip_issue_ncq_command(port, rq->tag);
2132 }
2133
2134 /*
2135  * Sysfs status dump.
2136  *
2137  * @dev  Pointer to the device structure, passed by the kernrel.
2138  * @attr Pointer to the device_attribute structure passed by the kernel.
2139  * @buf  Pointer to the char buffer that will receive the stats info.
2140  *
2141  * return value
2142  *      The size, in bytes, of the data copied into buf.
2143  */
2144 static ssize_t mtip_hw_show_status(struct device *dev,
2145                                 struct device_attribute *attr,
2146                                 char *buf)
2147 {
2148         struct driver_data *dd = dev_to_disk(dev)->private_data;
2149         int size = 0;
2150
2151         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2152                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2153         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2154                 size += sprintf(buf, "%s", "write_protect\n");
2155         else
2156                 size += sprintf(buf, "%s", "online\n");
2157
2158         return size;
2159 }
2160
2161 static DEVICE_ATTR(status, 0444, mtip_hw_show_status, NULL);
2162
2163 static struct attribute *mtip_disk_attrs[] = {
2164         &dev_attr_status.attr,
2165         NULL,
2166 };
2167
2168 static const struct attribute_group mtip_disk_attr_group = {
2169         .attrs = mtip_disk_attrs,
2170 };
2171
2172 static const struct attribute_group *mtip_disk_attr_groups[] = {
2173         &mtip_disk_attr_group,
2174         NULL,
2175 };
2176
2177 /* debugsfs entries */
2178
2179 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2180 {
2181         int size = 0;
2182         struct driver_data *dd, *tmp;
2183         unsigned long flags;
2184         char id_buf[42];
2185         u16 status = 0;
2186
2187         spin_lock_irqsave(&dev_lock, flags);
2188         size += sprintf(&buf[size], "Devices Present:\n");
2189         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2190                 if (dd->pdev) {
2191                         if (dd->port &&
2192                             dd->port->identify &&
2193                             dd->port->identify_valid) {
2194                                 strlcpy(id_buf,
2195                                         (char *) (dd->port->identify + 10), 21);
2196                                 status = *(dd->port->identify + 141);
2197                         } else {
2198                                 memset(id_buf, 0, 42);
2199                                 status = 0;
2200                         }
2201
2202                         if (dd->port &&
2203                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2204                                 size += sprintf(&buf[size],
2205                                         " device %s %s (ftl rebuild %d %%)\n",
2206                                         dev_name(&dd->pdev->dev),
2207                                         id_buf,
2208                                         status);
2209                         } else {
2210                                 size += sprintf(&buf[size],
2211                                         " device %s %s\n",
2212                                         dev_name(&dd->pdev->dev),
2213                                         id_buf);
2214                         }
2215                 }
2216         }
2217
2218         size += sprintf(&buf[size], "Devices Being Removed:\n");
2219         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2220                 if (dd->pdev) {
2221                         if (dd->port &&
2222                             dd->port->identify &&
2223                             dd->port->identify_valid) {
2224                                 strlcpy(id_buf,
2225                                         (char *) (dd->port->identify+10), 21);
2226                                 status = *(dd->port->identify + 141);
2227                         } else {
2228                                 memset(id_buf, 0, 42);
2229                                 status = 0;
2230                         }
2231
2232                         if (dd->port &&
2233                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2234                                 size += sprintf(&buf[size],
2235                                         " device %s %s (ftl rebuild %d %%)\n",
2236                                         dev_name(&dd->pdev->dev),
2237                                         id_buf,
2238                                         status);
2239                         } else {
2240                                 size += sprintf(&buf[size],
2241                                         " device %s %s\n",
2242                                         dev_name(&dd->pdev->dev),
2243                                         id_buf);
2244                         }
2245                 }
2246         }
2247         spin_unlock_irqrestore(&dev_lock, flags);
2248
2249         return size;
2250 }
2251
2252 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2253                                                 size_t len, loff_t *offset)
2254 {
2255         int size = *offset;
2256         char *buf;
2257         int rv = 0;
2258
2259         if (!len || *offset)
2260                 return 0;
2261
2262         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2263         if (!buf)
2264                 return -ENOMEM;
2265
2266         size += show_device_status(NULL, buf);
2267
2268         *offset = size <= len ? size : len;
2269         size = copy_to_user(ubuf, buf, *offset);
2270         if (size)
2271                 rv = -EFAULT;
2272
2273         kfree(buf);
2274         return rv ? rv : *offset;
2275 }
2276
2277 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2278                                   size_t len, loff_t *offset)
2279 {
2280         struct driver_data *dd =  (struct driver_data *)f->private_data;
2281         char *buf;
2282         u32 group_allocated;
2283         int size = *offset;
2284         int n, rv = 0;
2285
2286         if (!len || size)
2287                 return 0;
2288
2289         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2290         if (!buf)
2291                 return -ENOMEM;
2292
2293         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2294
2295         for (n = dd->slot_groups-1; n >= 0; n--)
2296                 size += sprintf(&buf[size], "%08X ",
2297                                          readl(dd->port->s_active[n]));
2298
2299         size += sprintf(&buf[size], "]\n");
2300         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2301
2302         for (n = dd->slot_groups-1; n >= 0; n--)
2303                 size += sprintf(&buf[size], "%08X ",
2304                                         readl(dd->port->cmd_issue[n]));
2305
2306         size += sprintf(&buf[size], "]\n");
2307         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2308
2309         for (n = dd->slot_groups-1; n >= 0; n--)
2310                 size += sprintf(&buf[size], "%08X ",
2311                                 readl(dd->port->completed[n]));
2312
2313         size += sprintf(&buf[size], "]\n");
2314         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2315                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2316         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2317                                 readl(dd->mmio + HOST_IRQ_STAT));
2318         size += sprintf(&buf[size], "\n");
2319
2320         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2321
2322         for (n = dd->slot_groups-1; n >= 0; n--) {
2323                 if (sizeof(long) > sizeof(u32))
2324                         group_allocated =
2325                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2326                 else
2327                         group_allocated = dd->port->cmds_to_issue[n];
2328                 size += sprintf(&buf[size], "%08X ", group_allocated);
2329         }
2330         size += sprintf(&buf[size], "]\n");
2331
2332         *offset = size <= len ? size : len;
2333         size = copy_to_user(ubuf, buf, *offset);
2334         if (size)
2335                 rv = -EFAULT;
2336
2337         kfree(buf);
2338         return rv ? rv : *offset;
2339 }
2340
2341 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2342                                   size_t len, loff_t *offset)
2343 {
2344         struct driver_data *dd =  (struct driver_data *)f->private_data;
2345         char *buf;
2346         int size = *offset;
2347         int rv = 0;
2348
2349         if (!len || size)
2350                 return 0;
2351
2352         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2353         if (!buf)
2354                 return -ENOMEM;
2355
2356         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2357                                                         dd->port->flags);
2358         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2359                                                         dd->dd_flag);
2360
2361         *offset = size <= len ? size : len;
2362         size = copy_to_user(ubuf, buf, *offset);
2363         if (size)
2364                 rv = -EFAULT;
2365
2366         kfree(buf);
2367         return rv ? rv : *offset;
2368 }
2369
2370 static const struct file_operations mtip_device_status_fops = {
2371         .owner  = THIS_MODULE,
2372         .open   = simple_open,
2373         .read   = mtip_hw_read_device_status,
2374         .llseek = no_llseek,
2375 };
2376
2377 static const struct file_operations mtip_regs_fops = {
2378         .owner  = THIS_MODULE,
2379         .open   = simple_open,
2380         .read   = mtip_hw_read_registers,
2381         .llseek = no_llseek,
2382 };
2383
2384 static const struct file_operations mtip_flags_fops = {
2385         .owner  = THIS_MODULE,
2386         .open   = simple_open,
2387         .read   = mtip_hw_read_flags,
2388         .llseek = no_llseek,
2389 };
2390
2391 static int mtip_hw_debugfs_init(struct driver_data *dd)
2392 {
2393         if (!dfs_parent)
2394                 return -1;
2395
2396         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2397         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2398                 dev_warn(&dd->pdev->dev,
2399                         "Error creating node %s under debugfs\n",
2400                                                 dd->disk->disk_name);
2401                 dd->dfs_node = NULL;
2402                 return -1;
2403         }
2404
2405         debugfs_create_file("flags", 0444, dd->dfs_node, dd, &mtip_flags_fops);
2406         debugfs_create_file("registers", 0444, dd->dfs_node, dd,
2407                             &mtip_regs_fops);
2408
2409         return 0;
2410 }
2411
2412 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2413 {
2414         debugfs_remove_recursive(dd->dfs_node);
2415 }
2416
2417 /*
2418  * Perform any init/resume time hardware setup
2419  *
2420  * @dd Pointer to the driver data structure.
2421  *
2422  * return value
2423  *      None
2424  */
2425 static inline void hba_setup(struct driver_data *dd)
2426 {
2427         u32 hwdata;
2428         hwdata = readl(dd->mmio + HOST_HSORG);
2429
2430         /* interrupt bug workaround: use only 1 IS bit.*/
2431         writel(hwdata |
2432                 HSORG_DISABLE_SLOTGRP_INTR |
2433                 HSORG_DISABLE_SLOTGRP_PXIS,
2434                 dd->mmio + HOST_HSORG);
2435 }
2436
2437 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2438 {
2439         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2440 }
2441
2442 /*
2443  * Detect the details of the product, and store anything needed
2444  * into the driver data structure.  This includes product type and
2445  * version and number of slot groups.
2446  *
2447  * @dd Pointer to the driver data structure.
2448  *
2449  * return value
2450  *      None
2451  */
2452 static void mtip_detect_product(struct driver_data *dd)
2453 {
2454         u32 hwdata;
2455         unsigned int rev, slotgroups;
2456
2457         /*
2458          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2459          * info register:
2460          * [15:8] hardware/software interface rev#
2461          * [   3] asic-style interface
2462          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2463          */
2464         hwdata = readl(dd->mmio + HOST_HSORG);
2465
2466         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2467         dd->slot_groups = 1;
2468
2469         if (hwdata & 0x8) {
2470                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2471                 rev = (hwdata & HSORG_HWREV) >> 8;
2472                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2473                 dev_info(&dd->pdev->dev,
2474                         "ASIC-FPGA design, HS rev 0x%x, "
2475                         "%i slot groups [%i slots]\n",
2476                          rev,
2477                          slotgroups,
2478                          slotgroups * 32);
2479
2480                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2481                         dev_warn(&dd->pdev->dev,
2482                                 "Warning: driver only supports "
2483                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2484                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2485                 }
2486                 dd->slot_groups = slotgroups;
2487                 return;
2488         }
2489
2490         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2491 }
2492
2493 /*
2494  * Blocking wait for FTL rebuild to complete
2495  *
2496  * @dd Pointer to the DRIVER_DATA structure.
2497  *
2498  * return value
2499  *      0       FTL rebuild completed successfully
2500  *      -EFAULT FTL rebuild error/timeout/interruption
2501  */
2502 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2503 {
2504         unsigned long timeout, cnt = 0, start;
2505
2506         dev_warn(&dd->pdev->dev,
2507                 "FTL rebuild in progress. Polling for completion.\n");
2508
2509         start = jiffies;
2510         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2511
2512         do {
2513                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2514                                 &dd->dd_flag)))
2515                         return -EFAULT;
2516                 if (mtip_check_surprise_removal(dd->pdev))
2517                         return -EFAULT;
2518
2519                 if (mtip_get_identify(dd->port, NULL) < 0)
2520                         return -EFAULT;
2521
2522                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2523                         MTIP_FTL_REBUILD_MAGIC) {
2524                         ssleep(1);
2525                         /* Print message every 3 minutes */
2526                         if (cnt++ >= 180) {
2527                                 dev_warn(&dd->pdev->dev,
2528                                 "FTL rebuild in progress (%d secs).\n",
2529                                 jiffies_to_msecs(jiffies - start) / 1000);
2530                                 cnt = 0;
2531                         }
2532                 } else {
2533                         dev_warn(&dd->pdev->dev,
2534                                 "FTL rebuild complete (%d secs).\n",
2535                         jiffies_to_msecs(jiffies - start) / 1000);
2536                         mtip_block_initialize(dd);
2537                         return 0;
2538                 }
2539         } while (time_before(jiffies, timeout));
2540
2541         /* Check for timeout */
2542         dev_err(&dd->pdev->dev,
2543                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2544                 jiffies_to_msecs(jiffies - start) / 1000);
2545         return -EFAULT;
2546 }
2547
2548 static void mtip_softirq_done_fn(struct request *rq)
2549 {
2550         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2551         struct driver_data *dd = rq->q->queuedata;
2552
2553         /* Unmap the DMA scatter list entries */
2554         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2555                                                         cmd->direction);
2556
2557         if (unlikely(cmd->unaligned))
2558                 atomic_inc(&dd->port->cmd_slot_unal);
2559
2560         blk_mq_end_request(rq, cmd->status);
2561 }
2562
2563 static bool mtip_abort_cmd(struct request *req, void *data, bool reserved)
2564 {
2565         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
2566         struct driver_data *dd = data;
2567
2568         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2569
2570         clear_bit(req->tag, dd->port->cmds_to_issue);
2571         cmd->status = BLK_STS_IOERR;
2572         mtip_softirq_done_fn(req);
2573         return true;
2574 }
2575
2576 static bool mtip_queue_cmd(struct request *req, void *data, bool reserved)
2577 {
2578         struct driver_data *dd = data;
2579
2580         set_bit(req->tag, dd->port->cmds_to_issue);
2581         blk_abort_request(req);
2582         return true;
2583 }
2584
2585 /*
2586  * service thread to issue queued commands
2587  *
2588  * @data Pointer to the driver data structure.
2589  *
2590  * return value
2591  *      0
2592  */
2593
2594 static int mtip_service_thread(void *data)
2595 {
2596         struct driver_data *dd = (struct driver_data *)data;
2597         unsigned long slot, slot_start, slot_wrap, to;
2598         unsigned int num_cmd_slots = dd->slot_groups * 32;
2599         struct mtip_port *port = dd->port;
2600
2601         while (1) {
2602                 if (kthread_should_stop() ||
2603                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2604                         goto st_out;
2605                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2606
2607                 /*
2608                  * the condition is to check neither an internal command is
2609                  * is in progress nor error handling is active
2610                  */
2611                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2612                         (port->flags & MTIP_PF_SVC_THD_WORK));
2613
2614                 if (kthread_should_stop() ||
2615                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2616                         goto st_out;
2617
2618                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2619                                 &dd->dd_flag)))
2620                         goto st_out;
2621
2622                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2623
2624 restart_eh:
2625                 /* Demux bits: start with error handling */
2626                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2627                         mtip_handle_tfe(dd);
2628                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2629                 }
2630
2631                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2632                         goto restart_eh;
2633
2634                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2635                         to = jiffies + msecs_to_jiffies(5000);
2636
2637                         do {
2638                                 mdelay(100);
2639                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2640                                 time_before(jiffies, to));
2641
2642                         if (atomic_read(&dd->irq_workers_active) != 0)
2643                                 dev_warn(&dd->pdev->dev,
2644                                         "Completion workers still active!");
2645
2646                         blk_mq_quiesce_queue(dd->queue);
2647
2648                         blk_mq_tagset_busy_iter(&dd->tags, mtip_queue_cmd, dd);
2649
2650                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
2651
2652                         if (mtip_device_reset(dd))
2653                                 blk_mq_tagset_busy_iter(&dd->tags,
2654                                                         mtip_abort_cmd, dd);
2655
2656                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
2657
2658                         blk_mq_unquiesce_queue(dd->queue);
2659                 }
2660
2661                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2662                         slot = 1;
2663                         /* used to restrict the loop to one iteration */
2664                         slot_start = num_cmd_slots;
2665                         slot_wrap = 0;
2666                         while (1) {
2667                                 slot = find_next_bit(port->cmds_to_issue,
2668                                                 num_cmd_slots, slot);
2669                                 if (slot_wrap == 1) {
2670                                         if ((slot_start >= slot) ||
2671                                                 (slot >= num_cmd_slots))
2672                                                 break;
2673                                 }
2674                                 if (unlikely(slot_start == num_cmd_slots))
2675                                         slot_start = slot;
2676
2677                                 if (unlikely(slot == num_cmd_slots)) {
2678                                         slot = 1;
2679                                         slot_wrap = 1;
2680                                         continue;
2681                                 }
2682
2683                                 /* Issue the command to the hardware */
2684                                 mtip_issue_ncq_command(port, slot);
2685
2686                                 clear_bit(slot, port->cmds_to_issue);
2687                         }
2688
2689                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2690                 }
2691
2692                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2693                         if (mtip_ftl_rebuild_poll(dd) == 0)
2694                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2695                 }
2696         }
2697
2698 st_out:
2699         return 0;
2700 }
2701
2702 /*
2703  * DMA region teardown
2704  *
2705  * @dd Pointer to driver_data structure
2706  *
2707  * return value
2708  *      None
2709  */
2710 static void mtip_dma_free(struct driver_data *dd)
2711 {
2712         struct mtip_port *port = dd->port;
2713
2714         if (port->block1)
2715                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2716                                         port->block1, port->block1_dma);
2717
2718         if (port->command_list) {
2719                 dma_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2720                                 port->command_list, port->command_list_dma);
2721         }
2722 }
2723
2724 /*
2725  * DMA region setup
2726  *
2727  * @dd Pointer to driver_data structure
2728  *
2729  * return value
2730  *      -ENOMEM Not enough free DMA region space to initialize driver
2731  */
2732 static int mtip_dma_alloc(struct driver_data *dd)
2733 {
2734         struct mtip_port *port = dd->port;
2735
2736         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
2737         port->block1 =
2738                 dma_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2739                                         &port->block1_dma, GFP_KERNEL);
2740         if (!port->block1)
2741                 return -ENOMEM;
2742
2743         /* Allocate dma memory for command list */
2744         port->command_list =
2745                 dma_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2746                                         &port->command_list_dma, GFP_KERNEL);
2747         if (!port->command_list) {
2748                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2749                                         port->block1, port->block1_dma);
2750                 port->block1 = NULL;
2751                 port->block1_dma = 0;
2752                 return -ENOMEM;
2753         }
2754
2755         /* Setup all pointers into first DMA region */
2756         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
2757         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
2758         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
2759         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
2760         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
2761         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
2762         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
2763         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
2764
2765         return 0;
2766 }
2767
2768 static int mtip_hw_get_identify(struct driver_data *dd)
2769 {
2770         struct smart_attr attr242;
2771         unsigned char *buf;
2772         int rv;
2773
2774         if (mtip_get_identify(dd->port, NULL) < 0)
2775                 return -EFAULT;
2776
2777         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2778                 MTIP_FTL_REBUILD_MAGIC) {
2779                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
2780                 return MTIP_FTL_REBUILD_MAGIC;
2781         }
2782         mtip_dump_identify(dd->port);
2783
2784         /* check write protect, over temp and rebuild statuses */
2785         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
2786                                 dd->port->log_buf,
2787                                 dd->port->log_buf_dma, 1);
2788         if (rv) {
2789                 dev_warn(&dd->pdev->dev,
2790                         "Error in READ LOG EXT (10h) command\n");
2791                 /* non-critical error, don't fail the load */
2792         } else {
2793                 buf = (unsigned char *)dd->port->log_buf;
2794                 if (buf[259] & 0x1) {
2795                         dev_info(&dd->pdev->dev,
2796                                 "Write protect bit is set.\n");
2797                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
2798                 }
2799                 if (buf[288] == 0xF7) {
2800                         dev_info(&dd->pdev->dev,
2801                                 "Exceeded Tmax, drive in thermal shutdown.\n");
2802                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
2803                 }
2804                 if (buf[288] == 0xBF) {
2805                         dev_info(&dd->pdev->dev,
2806                                 "Drive indicates rebuild has failed.\n");
2807                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
2808                 }
2809         }
2810
2811         /* get write protect progess */
2812         memset(&attr242, 0, sizeof(struct smart_attr));
2813         if (mtip_get_smart_attr(dd->port, 242, &attr242))
2814                 dev_warn(&dd->pdev->dev,
2815                                 "Unable to check write protect progress\n");
2816         else
2817                 dev_info(&dd->pdev->dev,
2818                                 "Write protect progress: %u%% (%u blocks)\n",
2819                                 attr242.cur, le32_to_cpu(attr242.data));
2820
2821         return rv;
2822 }
2823
2824 /*
2825  * Called once for each card.
2826  *
2827  * @dd Pointer to the driver data structure.
2828  *
2829  * return value
2830  *      0 on success, else an error code.
2831  */
2832 static int mtip_hw_init(struct driver_data *dd)
2833 {
2834         int i;
2835         int rv;
2836         unsigned long timeout, timetaken;
2837
2838         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2839
2840         mtip_detect_product(dd);
2841         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2842                 rv = -EIO;
2843                 goto out1;
2844         }
2845
2846         hba_setup(dd);
2847
2848         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
2849                                 dd->numa_node);
2850         if (!dd->port)
2851                 return -ENOMEM;
2852
2853         /* Continue workqueue setup */
2854         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2855                 dd->work[i].port = dd->port;
2856
2857         /* Enable unaligned IO constraints for some devices */
2858         if (mtip_device_unaligned_constrained(dd))
2859                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
2860         else
2861                 dd->unal_qdepth = 0;
2862
2863         atomic_set(&dd->port->cmd_slot_unal, dd->unal_qdepth);
2864
2865         /* Spinlock to prevent concurrent issue */
2866         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2867                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
2868
2869         /* Set the port mmio base address. */
2870         dd->port->mmio  = dd->mmio + PORT_OFFSET;
2871         dd->port->dd    = dd;
2872
2873         /* DMA allocations */
2874         rv = mtip_dma_alloc(dd);
2875         if (rv < 0)
2876                 goto out1;
2877
2878         /* Setup the pointers to the extended s_active and CI registers. */
2879         for (i = 0; i < dd->slot_groups; i++) {
2880                 dd->port->s_active[i] =
2881                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
2882                 dd->port->cmd_issue[i] =
2883                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
2884                 dd->port->completed[i] =
2885                         dd->port->mmio + i*0x80 + PORT_SDBV;
2886         }
2887
2888         timetaken = jiffies;
2889         timeout = jiffies + msecs_to_jiffies(30000);
2890         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
2891                  time_before(jiffies, timeout)) {
2892                 mdelay(100);
2893         }
2894         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
2895                 timetaken = jiffies - timetaken;
2896                 dev_warn(&dd->pdev->dev,
2897                         "Surprise removal detected at %u ms\n",
2898                         jiffies_to_msecs(timetaken));
2899                 rv = -ENODEV;
2900                 goto out2 ;
2901         }
2902         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2903                 timetaken = jiffies - timetaken;
2904                 dev_warn(&dd->pdev->dev,
2905                         "Removal detected at %u ms\n",
2906                         jiffies_to_msecs(timetaken));
2907                 rv = -EFAULT;
2908                 goto out2;
2909         }
2910
2911         /* Conditionally reset the HBA. */
2912         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
2913                 if (mtip_hba_reset(dd) < 0) {
2914                         dev_err(&dd->pdev->dev,
2915                                 "Card did not reset within timeout\n");
2916                         rv = -EIO;
2917                         goto out2;
2918                 }
2919         } else {
2920                 /* Clear any pending interrupts on the HBA */
2921                 writel(readl(dd->mmio + HOST_IRQ_STAT),
2922                         dd->mmio + HOST_IRQ_STAT);
2923         }
2924
2925         mtip_init_port(dd->port);
2926         mtip_start_port(dd->port);
2927
2928         /* Setup the ISR and enable interrupts. */
2929         rv = request_irq(dd->pdev->irq, mtip_irq_handler, IRQF_SHARED,
2930                          dev_driver_string(&dd->pdev->dev), dd);
2931         if (rv) {
2932                 dev_err(&dd->pdev->dev,
2933                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
2934                 goto out2;
2935         }
2936         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
2937
2938         /* Enable interrupts on the HBA. */
2939         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2940                                         dd->mmio + HOST_CTL);
2941
2942         init_waitqueue_head(&dd->port->svc_wait);
2943
2944         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
2945                 rv = -EFAULT;
2946                 goto out3;
2947         }
2948
2949         return rv;
2950
2951 out3:
2952         /* Disable interrupts on the HBA. */
2953         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2954                         dd->mmio + HOST_CTL);
2955
2956         /* Release the IRQ. */
2957         irq_set_affinity_hint(dd->pdev->irq, NULL);
2958         free_irq(dd->pdev->irq, dd);
2959
2960 out2:
2961         mtip_deinit_port(dd->port);
2962         mtip_dma_free(dd);
2963
2964 out1:
2965         /* Free the memory allocated for the for structure. */
2966         kfree(dd->port);
2967
2968         return rv;
2969 }
2970
2971 static int mtip_standby_drive(struct driver_data *dd)
2972 {
2973         int rv = 0;
2974
2975         if (dd->sr || !dd->port)
2976                 return -ENODEV;
2977         /*
2978          * Send standby immediate (E0h) to the drive so that it
2979          * saves its state.
2980          */
2981         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
2982             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
2983             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
2984                 rv = mtip_standby_immediate(dd->port);
2985                 if (rv)
2986                         dev_warn(&dd->pdev->dev,
2987                                 "STANDBY IMMEDIATE failed\n");
2988         }
2989         return rv;
2990 }
2991
2992 /*
2993  * Called to deinitialize an interface.
2994  *
2995  * @dd Pointer to the driver data structure.
2996  *
2997  * return value
2998  *      0
2999  */
3000 static int mtip_hw_exit(struct driver_data *dd)
3001 {
3002         if (!dd->sr) {
3003                 /* de-initialize the port. */
3004                 mtip_deinit_port(dd->port);
3005
3006                 /* Disable interrupts on the HBA. */
3007                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3008                                 dd->mmio + HOST_CTL);
3009         }
3010
3011         /* Release the IRQ. */
3012         irq_set_affinity_hint(dd->pdev->irq, NULL);
3013         free_irq(dd->pdev->irq, dd);
3014         msleep(1000);
3015
3016         /* Free dma regions */
3017         mtip_dma_free(dd);
3018
3019         /* Free the memory allocated for the for structure. */
3020         kfree(dd->port);
3021         dd->port = NULL;
3022
3023         return 0;
3024 }
3025
3026 /*
3027  * Issue a Standby Immediate command to the device.
3028  *
3029  * This function is called by the Block Layer just before the
3030  * system powers off during a shutdown.
3031  *
3032  * @dd Pointer to the driver data structure.
3033  *
3034  * return value
3035  *      0
3036  */
3037 static int mtip_hw_shutdown(struct driver_data *dd)
3038 {
3039         /*
3040          * Send standby immediate (E0h) to the drive so that it
3041          * saves its state.
3042          */
3043         mtip_standby_drive(dd);
3044
3045         return 0;
3046 }
3047
3048 /*
3049  * Suspend function
3050  *
3051  * This function is called by the Block Layer just before the
3052  * system hibernates.
3053  *
3054  * @dd Pointer to the driver data structure.
3055  *
3056  * return value
3057  *      0       Suspend was successful
3058  *      -EFAULT Suspend was not successful
3059  */
3060 static int mtip_hw_suspend(struct driver_data *dd)
3061 {
3062         /*
3063          * Send standby immediate (E0h) to the drive
3064          * so that it saves its state.
3065          */
3066         if (mtip_standby_drive(dd) != 0) {
3067                 dev_err(&dd->pdev->dev,
3068                         "Failed standby-immediate command\n");
3069                 return -EFAULT;
3070         }
3071
3072         /* Disable interrupts on the HBA.*/
3073         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3074                         dd->mmio + HOST_CTL);
3075         mtip_deinit_port(dd->port);
3076
3077         return 0;
3078 }
3079
3080 /*
3081  * Resume function
3082  *
3083  * This function is called by the Block Layer as the
3084  * system resumes.
3085  *
3086  * @dd Pointer to the driver data structure.
3087  *
3088  * return value
3089  *      0       Resume was successful
3090  *      -EFAULT Resume was not successful
3091  */
3092 static int mtip_hw_resume(struct driver_data *dd)
3093 {
3094         /* Perform any needed hardware setup steps */
3095         hba_setup(dd);
3096
3097         /* Reset the HBA */
3098         if (mtip_hba_reset(dd) != 0) {
3099                 dev_err(&dd->pdev->dev,
3100                         "Unable to reset the HBA\n");
3101                 return -EFAULT;
3102         }
3103
3104         /*
3105          * Enable the port, DMA engine, and FIS reception specific
3106          * h/w in controller.
3107          */
3108         mtip_init_port(dd->port);
3109         mtip_start_port(dd->port);
3110
3111         /* Enable interrupts on the HBA.*/
3112         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3113                         dd->mmio + HOST_CTL);
3114
3115         return 0;
3116 }
3117
3118 /*
3119  * Helper function for reusing disk name
3120  * upon hot insertion.
3121  */
3122 static int rssd_disk_name_format(char *prefix,
3123                                  int index,
3124                                  char *buf,
3125                                  int buflen)
3126 {
3127         const int base = 'z' - 'a' + 1;
3128         char *begin = buf + strlen(prefix);
3129         char *end = buf + buflen;
3130         char *p;
3131         int unit;
3132
3133         p = end - 1;
3134         *p = '\0';
3135         unit = base;
3136         do {
3137                 if (p == begin)
3138                         return -EINVAL;
3139                 *--p = 'a' + (index % unit);
3140                 index = (index / unit) - 1;
3141         } while (index >= 0);
3142
3143         memmove(begin, p, end - p);
3144         memcpy(buf, prefix, strlen(prefix));
3145
3146         return 0;
3147 }
3148
3149 /*
3150  * Block layer IOCTL handler.
3151  *
3152  * @dev Pointer to the block_device structure.
3153  * @mode ignored
3154  * @cmd IOCTL command passed from the user application.
3155  * @arg Argument passed from the user application.
3156  *
3157  * return value
3158  *      0        IOCTL completed successfully.
3159  *      -ENOTTY  IOCTL not supported or invalid driver data
3160  *                 structure pointer.
3161  */
3162 static int mtip_block_ioctl(struct block_device *dev,
3163                             fmode_t mode,
3164                             unsigned cmd,
3165                             unsigned long arg)
3166 {
3167         struct driver_data *dd = dev->bd_disk->private_data;
3168
3169         if (!capable(CAP_SYS_ADMIN))
3170                 return -EACCES;
3171
3172         if (!dd)
3173                 return -ENOTTY;
3174
3175         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3176                 return -ENOTTY;
3177
3178         switch (cmd) {
3179         case BLKFLSBUF:
3180                 return -ENOTTY;
3181         default:
3182                 return mtip_hw_ioctl(dd, cmd, arg);
3183         }
3184 }
3185
3186 #ifdef CONFIG_COMPAT
3187 /*
3188  * Block layer compat IOCTL handler.
3189  *
3190  * @dev Pointer to the block_device structure.
3191  * @mode ignored
3192  * @cmd IOCTL command passed from the user application.
3193  * @arg Argument passed from the user application.
3194  *
3195  * return value
3196  *      0        IOCTL completed successfully.
3197  *      -ENOTTY  IOCTL not supported or invalid driver data
3198  *                 structure pointer.
3199  */
3200 static int mtip_block_compat_ioctl(struct block_device *dev,
3201                             fmode_t mode,
3202                             unsigned cmd,
3203                             unsigned long arg)
3204 {
3205         struct driver_data *dd = dev->bd_disk->private_data;
3206
3207         if (!capable(CAP_SYS_ADMIN))
3208                 return -EACCES;
3209
3210         if (!dd)
3211                 return -ENOTTY;
3212
3213         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3214                 return -ENOTTY;
3215
3216         switch (cmd) {
3217         case BLKFLSBUF:
3218                 return -ENOTTY;
3219         case HDIO_DRIVE_TASKFILE: {
3220                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3221                 ide_task_request_t req_task;
3222                 int compat_tasksize, outtotal, ret;
3223
3224                 compat_tasksize =
3225                         sizeof(struct mtip_compat_ide_task_request_s);
3226
3227                 compat_req_task =
3228                         (struct mtip_compat_ide_task_request_s __user *) arg;
3229
3230                 if (copy_from_user(&req_task, (void __user *) arg,
3231                         compat_tasksize - (2 * sizeof(compat_long_t))))
3232                         return -EFAULT;
3233
3234                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3235                         return -EFAULT;
3236
3237                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3238                         return -EFAULT;
3239
3240                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3241
3242                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3243                                                 &req_task, outtotal);
3244
3245                 if (copy_to_user((void __user *) arg, &req_task,
3246                                 compat_tasksize -
3247                                 (2 * sizeof(compat_long_t))))
3248                         return -EFAULT;
3249
3250                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3251                         return -EFAULT;
3252
3253                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3254                         return -EFAULT;
3255
3256                 return ret;
3257         }
3258         default:
3259                 return mtip_hw_ioctl(dd, cmd, arg);
3260         }
3261 }
3262 #endif
3263
3264 /*
3265  * Obtain the geometry of the device.
3266  *
3267  * You may think that this function is obsolete, but some applications,
3268  * fdisk for example still used CHS values. This function describes the
3269  * device as having 224 heads and 56 sectors per cylinder. These values are
3270  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3271  * partition is described in terms of a start and end cylinder this means
3272  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3273  * affects performance.
3274  *
3275  * @dev Pointer to the block_device strucutre.
3276  * @geo Pointer to a hd_geometry structure.
3277  *
3278  * return value
3279  *      0       Operation completed successfully.
3280  *      -ENOTTY An error occurred while reading the drive capacity.
3281  */
3282 static int mtip_block_getgeo(struct block_device *dev,
3283                                 struct hd_geometry *geo)
3284 {
3285         struct driver_data *dd = dev->bd_disk->private_data;
3286         sector_t capacity;
3287
3288         if (!dd)
3289                 return -ENOTTY;
3290
3291         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3292                 dev_warn(&dd->pdev->dev,
3293                         "Could not get drive capacity.\n");
3294                 return -ENOTTY;
3295         }
3296
3297         geo->heads = 224;
3298         geo->sectors = 56;
3299         sector_div(capacity, (geo->heads * geo->sectors));
3300         geo->cylinders = capacity;
3301         return 0;
3302 }
3303
3304 static int mtip_block_open(struct block_device *dev, fmode_t mode)
3305 {
3306         struct driver_data *dd;
3307
3308         if (dev && dev->bd_disk) {
3309                 dd = (struct driver_data *) dev->bd_disk->private_data;
3310
3311                 if (dd) {
3312                         if (test_bit(MTIP_DDF_REMOVAL_BIT,
3313                                                         &dd->dd_flag)) {
3314                                 return -ENODEV;
3315                         }
3316                         return 0;
3317                 }
3318         }
3319         return -ENODEV;
3320 }
3321
3322 static void mtip_block_release(struct gendisk *disk, fmode_t mode)
3323 {
3324 }
3325
3326 /*
3327  * Block device operation function.
3328  *
3329  * This structure contains pointers to the functions required by the block
3330  * layer.
3331  */
3332 static const struct block_device_operations mtip_block_ops = {
3333         .open           = mtip_block_open,
3334         .release        = mtip_block_release,
3335         .ioctl          = mtip_block_ioctl,
3336 #ifdef CONFIG_COMPAT
3337         .compat_ioctl   = mtip_block_compat_ioctl,
3338 #endif
3339         .getgeo         = mtip_block_getgeo,
3340         .owner          = THIS_MODULE
3341 };
3342
3343 static inline bool is_se_active(struct driver_data *dd)
3344 {
3345         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3346                 if (dd->port->ic_pause_timer) {
3347                         unsigned long to = dd->port->ic_pause_timer +
3348                                                         msecs_to_jiffies(1000);
3349                         if (time_after(jiffies, to)) {
3350                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3351                                                         &dd->port->flags);
3352                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3353                                 dd->port->ic_pause_timer = 0;
3354                                 wake_up_interruptible(&dd->port->svc_wait);
3355                                 return false;
3356                         }
3357                 }
3358                 return true;
3359         }
3360         return false;
3361 }
3362
3363 static inline bool is_stopped(struct driver_data *dd, struct request *rq)
3364 {
3365         if (likely(!(dd->dd_flag & MTIP_DDF_STOP_IO)))
3366                 return false;
3367
3368         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
3369                 return true;
3370         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
3371                 return true;
3372         if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag) &&
3373             rq_data_dir(rq))
3374                 return true;
3375         if (test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))
3376                 return true;
3377         if (test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag))
3378                 return true;
3379
3380         return false;
3381 }
3382
3383 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3384                                   struct request *rq)
3385 {
3386         struct driver_data *dd = hctx->queue->queuedata;
3387         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3388
3389         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3390                 return false;
3391
3392         /*
3393          * If unaligned depth must be limited on this controller, mark it
3394          * as unaligned if the IO isn't on a 4k boundary (start of length).
3395          */
3396         if (blk_rq_sectors(rq) <= 64) {
3397                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3398                         cmd->unaligned = 1;
3399         }
3400
3401         if (cmd->unaligned && atomic_dec_if_positive(&dd->port->cmd_slot_unal) >= 0)
3402                 return true;
3403
3404         return false;
3405 }
3406
3407 static blk_status_t mtip_issue_reserved_cmd(struct blk_mq_hw_ctx *hctx,
3408                 struct request *rq)
3409 {
3410         struct driver_data *dd = hctx->queue->queuedata;
3411         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3412         struct mtip_int_cmd *icmd = cmd->icmd;
3413         struct mtip_cmd_hdr *hdr =
3414                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
3415         struct mtip_cmd_sg *command_sg;
3416
3417         if (mtip_commands_active(dd->port))
3418                 return BLK_STS_DEV_RESOURCE;
3419
3420         hdr->ctba = cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
3421         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
3422                 hdr->ctbau = cpu_to_le32((cmd->command_dma >> 16) >> 16);
3423         /* Populate the SG list */
3424         hdr->opts = cpu_to_le32(icmd->opts | icmd->fis_len);
3425         if (icmd->buf_len) {
3426                 command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
3427
3428                 command_sg->info = cpu_to_le32((icmd->buf_len-1) & 0x3FFFFF);
3429                 command_sg->dba = cpu_to_le32(icmd->buffer & 0xFFFFFFFF);
3430                 command_sg->dba_upper =
3431                         cpu_to_le32((icmd->buffer >> 16) >> 16);
3432
3433                 hdr->opts |= cpu_to_le32((1 << 16));
3434         }
3435
3436         /* Populate the command header */
3437         hdr->byte_count = 0;
3438
3439         blk_mq_start_request(rq);
3440         mtip_issue_non_ncq_command(dd->port, rq->tag);
3441         return 0;
3442 }
3443
3444 static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3445                          const struct blk_mq_queue_data *bd)
3446 {
3447         struct driver_data *dd = hctx->queue->queuedata;
3448         struct request *rq = bd->rq;
3449         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3450
3451         if (blk_rq_is_passthrough(rq))
3452                 return mtip_issue_reserved_cmd(hctx, rq);
3453
3454         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3455                 return BLK_STS_DEV_RESOURCE;
3456
3457         if (is_se_active(dd) || is_stopped(dd, rq))
3458                 return BLK_STS_IOERR;
3459
3460         blk_mq_start_request(rq);
3461
3462         mtip_hw_submit_io(dd, rq, cmd, hctx);
3463         return BLK_STS_OK;
3464 }
3465
3466 static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
3467                           unsigned int hctx_idx)
3468 {
3469         struct driver_data *dd = set->driver_data;
3470         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3471
3472         if (!cmd->command)
3473                 return;
3474
3475         dma_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ, cmd->command,
3476                           cmd->command_dma);
3477 }
3478
3479 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
3480                          unsigned int hctx_idx, unsigned int numa_node)
3481 {
3482         struct driver_data *dd = set->driver_data;
3483         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3484
3485         cmd->command = dma_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3486                         &cmd->command_dma, GFP_KERNEL);
3487         if (!cmd->command)
3488                 return -ENOMEM;
3489
3490         sg_init_table(cmd->sg, MTIP_MAX_SG);
3491         return 0;
3492 }
3493
3494 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req,
3495                                                                 bool reserved)
3496 {
3497         struct driver_data *dd = req->q->queuedata;
3498
3499         if (reserved) {
3500                 struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
3501
3502                 cmd->status = BLK_STS_TIMEOUT;
3503                 blk_mq_complete_request(req);
3504                 return BLK_EH_DONE;
3505         }
3506
3507         if (test_bit(req->tag, dd->port->cmds_to_issue))
3508                 goto exit_handler;
3509
3510         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3511                 goto exit_handler;
3512
3513         wake_up_interruptible(&dd->port->svc_wait);
3514 exit_handler:
3515         return BLK_EH_RESET_TIMER;
3516 }
3517
3518 static const struct blk_mq_ops mtip_mq_ops = {
3519         .queue_rq       = mtip_queue_rq,
3520         .init_request   = mtip_init_cmd,
3521         .exit_request   = mtip_free_cmd,
3522         .complete       = mtip_softirq_done_fn,
3523         .timeout        = mtip_cmd_timeout,
3524 };
3525
3526 /*
3527  * Block layer initialization function.
3528  *
3529  * This function is called once by the PCI layer for each P320
3530  * device that is connected to the system.
3531  *
3532  * @dd Pointer to the driver data structure.
3533  *
3534  * return value
3535  *      0 on success else an error code.
3536  */
3537 static int mtip_block_initialize(struct driver_data *dd)
3538 {
3539         int rv = 0, wait_for_rebuild = 0;
3540         sector_t capacity;
3541         unsigned int index = 0;
3542
3543         if (dd->disk)
3544                 goto skip_create_disk; /* hw init done, before rebuild */
3545
3546         if (mtip_hw_init(dd)) {
3547                 rv = -EINVAL;
3548                 goto protocol_init_error;
3549         }
3550
3551         memset(&dd->tags, 0, sizeof(dd->tags));
3552         dd->tags.ops = &mtip_mq_ops;
3553         dd->tags.nr_hw_queues = 1;
3554         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3555         dd->tags.reserved_tags = 1;
3556         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3557         dd->tags.numa_node = dd->numa_node;
3558         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3559         dd->tags.driver_data = dd;
3560         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3561
3562         rv = blk_mq_alloc_tag_set(&dd->tags);
3563         if (rv) {
3564                 dev_err(&dd->pdev->dev,
3565                         "Unable to allocate request queue\n");
3566                 goto block_queue_alloc_tag_error;
3567         }
3568
3569         dd->disk = blk_mq_alloc_disk(&dd->tags, dd);
3570         if (IS_ERR(dd->disk)) {
3571                 dev_err(&dd->pdev->dev,
3572                         "Unable to allocate request queue\n");
3573                 rv = -ENOMEM;
3574                 goto block_queue_alloc_init_error;
3575         }
3576         dd->queue               = dd->disk->queue;
3577
3578         rv = ida_alloc(&rssd_index_ida, GFP_KERNEL);
3579         if (rv < 0)
3580                 goto ida_get_error;
3581         index = rv;
3582
3583         rv = rssd_disk_name_format("rssd",
3584                                 index,
3585                                 dd->disk->disk_name,
3586                                 DISK_NAME_LEN);
3587         if (rv)
3588                 goto disk_index_error;
3589
3590         dd->disk->major         = dd->major;
3591         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3592         dd->disk->minors        = MTIP_MAX_MINORS;
3593         dd->disk->fops          = &mtip_block_ops;
3594         dd->disk->private_data  = dd;
3595         dd->index               = index;
3596
3597         mtip_hw_debugfs_init(dd);
3598
3599 skip_create_disk:
3600         /* Initialize the protocol layer. */
3601         wait_for_rebuild = mtip_hw_get_identify(dd);
3602         if (wait_for_rebuild < 0) {
3603                 dev_err(&dd->pdev->dev,
3604                         "Protocol layer initialization failed\n");
3605                 rv = -EINVAL;
3606                 goto init_hw_cmds_error;
3607         }
3608
3609         /*
3610          * if rebuild pending, start the service thread, and delay the block
3611          * queue creation and device_add_disk()
3612          */
3613         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3614                 goto start_service_thread;
3615
3616         /* Set device limits. */
3617         blk_queue_flag_set(QUEUE_FLAG_NONROT, dd->queue);
3618         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, dd->queue);
3619         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3620         blk_queue_physical_block_size(dd->queue, 4096);
3621         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3622         blk_queue_max_segment_size(dd->queue, 0x400000);
3623         dma_set_max_seg_size(&dd->pdev->dev, 0x400000);
3624         blk_queue_io_min(dd->queue, 4096);
3625
3626         /* Set the capacity of the device in 512 byte sectors. */
3627         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3628                 dev_warn(&dd->pdev->dev,
3629                         "Could not read drive capacity\n");
3630                 rv = -EIO;
3631                 goto read_capacity_error;
3632         }
3633         set_capacity(dd->disk, capacity);
3634
3635         /* Enable the block device and add it to /dev */
3636         device_add_disk(&dd->pdev->dev, dd->disk, mtip_disk_attr_groups);
3637
3638         if (dd->mtip_svc_handler) {
3639                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3640                 return rv; /* service thread created for handling rebuild */
3641         }
3642
3643 start_service_thread:
3644         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3645                                                 dd, dd->numa_node,
3646                                                 "mtip_svc_thd_%02d", index);
3647
3648         if (IS_ERR(dd->mtip_svc_handler)) {
3649                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3650                 dd->mtip_svc_handler = NULL;
3651                 rv = -EFAULT;
3652                 goto kthread_run_error;
3653         }
3654         wake_up_process(dd->mtip_svc_handler);
3655         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3656                 rv = wait_for_rebuild;
3657
3658         return rv;
3659
3660 kthread_run_error:
3661         /* Delete our gendisk. This also removes the device from /dev */
3662         del_gendisk(dd->disk);
3663 read_capacity_error:
3664 init_hw_cmds_error:
3665         mtip_hw_debugfs_exit(dd);
3666 disk_index_error:
3667         ida_free(&rssd_index_ida, index);
3668 ida_get_error:
3669         blk_cleanup_disk(dd->disk);
3670 block_queue_alloc_init_error:
3671         blk_mq_free_tag_set(&dd->tags);
3672 block_queue_alloc_tag_error:
3673         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3674 protocol_init_error:
3675         return rv;
3676 }
3677
3678 static bool mtip_no_dev_cleanup(struct request *rq, void *data, bool reserv)
3679 {
3680         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3681
3682         cmd->status = BLK_STS_IOERR;
3683         blk_mq_complete_request(rq);
3684         return true;
3685 }
3686
3687 /*
3688  * Block layer deinitialization function.
3689  *
3690  * Called by the PCI layer as each P320 device is removed.
3691  *
3692  * @dd Pointer to the driver data structure.
3693  *
3694  * return value
3695  *      0
3696  */
3697 static int mtip_block_remove(struct driver_data *dd)
3698 {
3699         mtip_hw_debugfs_exit(dd);
3700
3701         if (dd->mtip_svc_handler) {
3702                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3703                 wake_up_interruptible(&dd->port->svc_wait);
3704                 kthread_stop(dd->mtip_svc_handler);
3705         }
3706
3707         if (!dd->sr) {
3708                 /*
3709                  * Explicitly wait here for IOs to quiesce,
3710                  * as mtip_standby_drive usually won't wait for IOs.
3711                  */
3712                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS))
3713                         mtip_standby_drive(dd);
3714         }
3715         else
3716                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
3717                                                 dd->disk->disk_name);
3718
3719         blk_freeze_queue_start(dd->queue);
3720         blk_mq_quiesce_queue(dd->queue);
3721         blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
3722         blk_mq_unquiesce_queue(dd->queue);
3723
3724         if (dd->disk) {
3725                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3726                         del_gendisk(dd->disk);
3727                 if (dd->disk->queue) {
3728                         blk_cleanup_queue(dd->queue);
3729                         blk_mq_free_tag_set(&dd->tags);
3730                         dd->queue = NULL;
3731                 }
3732                 put_disk(dd->disk);
3733         }
3734         dd->disk  = NULL;
3735
3736         ida_free(&rssd_index_ida, dd->index);
3737
3738         /* De-initialize the protocol layer. */
3739         mtip_hw_exit(dd);
3740
3741         return 0;
3742 }
3743
3744 /*
3745  * Function called by the PCI layer when just before the
3746  * machine shuts down.
3747  *
3748  * If a protocol layer shutdown function is present it will be called
3749  * by this function.
3750  *
3751  * @dd Pointer to the driver data structure.
3752  *
3753  * return value
3754  *      0
3755  */
3756 static int mtip_block_shutdown(struct driver_data *dd)
3757 {
3758         mtip_hw_shutdown(dd);
3759
3760         /* Delete our gendisk structure, and cleanup the blk queue. */
3761         if (dd->disk) {
3762                 dev_info(&dd->pdev->dev,
3763                         "Shutting down %s ...\n", dd->disk->disk_name);
3764
3765                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3766                         del_gendisk(dd->disk);
3767                 if (dd->disk->queue) {
3768                         blk_cleanup_queue(dd->queue);
3769                         blk_mq_free_tag_set(&dd->tags);
3770                 }
3771                 put_disk(dd->disk);
3772                 dd->disk  = NULL;
3773                 dd->queue = NULL;
3774         }
3775
3776         ida_free(&rssd_index_ida, dd->index);
3777         return 0;
3778 }
3779
3780 static int mtip_block_suspend(struct driver_data *dd)
3781 {
3782         dev_info(&dd->pdev->dev,
3783                 "Suspending %s ...\n", dd->disk->disk_name);
3784         mtip_hw_suspend(dd);
3785         return 0;
3786 }
3787
3788 static int mtip_block_resume(struct driver_data *dd)
3789 {
3790         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
3791                 dd->disk->disk_name);
3792         mtip_hw_resume(dd);
3793         return 0;
3794 }
3795
3796 static void drop_cpu(int cpu)
3797 {
3798         cpu_use[cpu]--;
3799 }
3800
3801 static int get_least_used_cpu_on_node(int node)
3802 {
3803         int cpu, least_used_cpu, least_cnt;
3804         const struct cpumask *node_mask;
3805
3806         node_mask = cpumask_of_node(node);
3807         least_used_cpu = cpumask_first(node_mask);
3808         least_cnt = cpu_use[least_used_cpu];
3809         cpu = least_used_cpu;
3810
3811         for_each_cpu(cpu, node_mask) {
3812                 if (cpu_use[cpu] < least_cnt) {
3813                         least_used_cpu = cpu;
3814                         least_cnt = cpu_use[cpu];
3815                 }
3816         }
3817         cpu_use[least_used_cpu]++;
3818         return least_used_cpu;
3819 }
3820
3821 /* Helper for selecting a node in round robin mode */
3822 static inline int mtip_get_next_rr_node(void)
3823 {
3824         static int next_node = NUMA_NO_NODE;
3825
3826         if (next_node == NUMA_NO_NODE) {
3827                 next_node = first_online_node;
3828                 return next_node;
3829         }
3830
3831         next_node = next_online_node(next_node);
3832         if (next_node == MAX_NUMNODES)
3833                 next_node = first_online_node;
3834         return next_node;
3835 }
3836
3837 static DEFINE_HANDLER(0);
3838 static DEFINE_HANDLER(1);
3839 static DEFINE_HANDLER(2);
3840 static DEFINE_HANDLER(3);
3841 static DEFINE_HANDLER(4);
3842 static DEFINE_HANDLER(5);
3843 static DEFINE_HANDLER(6);
3844 static DEFINE_HANDLER(7);
3845
3846 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
3847 {
3848         unsigned short pcie_dev_ctrl;
3849
3850         if (pci_is_pcie(pdev)) {
3851                 pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctrl);
3852                 if (pcie_dev_ctrl & PCI_EXP_DEVCTL_NOSNOOP_EN ||
3853                     pcie_dev_ctrl & PCI_EXP_DEVCTL_RELAX_EN) {
3854                         dev_info(&dd->pdev->dev,
3855                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
3856                                         pdev->vendor, pdev->device);
3857                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
3858                                                 PCI_EXP_DEVCTL_RELAX_EN);
3859                         pcie_capability_write_word(pdev, PCI_EXP_DEVCTL,
3860                                 pcie_dev_ctrl);
3861                 }
3862         }
3863 }
3864
3865 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
3866 {
3867         /*
3868          * This workaround is specific to AMD/ATI chipset with a PCI upstream
3869          * device with device id 0x5aXX
3870          */
3871         if (pdev->bus && pdev->bus->self) {
3872                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
3873                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
3874                         mtip_disable_link_opts(dd, pdev->bus->self);
3875                 } else {
3876                         /* Check further up the topology */
3877                         struct pci_dev *parent_dev = pdev->bus->self;
3878                         if (parent_dev->bus &&
3879                                 parent_dev->bus->parent &&
3880                                 parent_dev->bus->parent->self &&
3881                                 parent_dev->bus->parent->self->vendor ==
3882                                          PCI_VENDOR_ID_ATI &&
3883                                 (parent_dev->bus->parent->self->device &
3884                                         0xff00) == 0x5a00) {
3885                                 mtip_disable_link_opts(dd,
3886                                         parent_dev->bus->parent->self);
3887                         }
3888                 }
3889         }
3890 }
3891
3892 /*
3893  * Called for each supported PCI device detected.
3894  *
3895  * This function allocates the private data structure, enables the
3896  * PCI device and then calls the block layer initialization function.
3897  *
3898  * return value
3899  *      0 on success else an error code.
3900  */
3901 static int mtip_pci_probe(struct pci_dev *pdev,
3902                         const struct pci_device_id *ent)
3903 {
3904         int rv = 0;
3905         struct driver_data *dd = NULL;
3906         char cpu_list[256];
3907         const struct cpumask *node_mask;
3908         int cpu, i = 0, j = 0;
3909         int my_node = NUMA_NO_NODE;
3910         unsigned long flags;
3911
3912         /* Allocate memory for this devices private data. */
3913         my_node = pcibus_to_node(pdev->bus);
3914         if (my_node != NUMA_NO_NODE) {
3915                 if (!node_online(my_node))
3916                         my_node = mtip_get_next_rr_node();
3917         } else {
3918                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
3919                 my_node = mtip_get_next_rr_node();
3920         }
3921         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
3922                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
3923                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
3924
3925         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
3926         if (!dd)
3927                 return -ENOMEM;
3928
3929         /* Attach the private data to this PCI device.  */
3930         pci_set_drvdata(pdev, dd);
3931
3932         rv = pcim_enable_device(pdev);
3933         if (rv < 0) {
3934                 dev_err(&pdev->dev, "Unable to enable device\n");
3935                 goto iomap_err;
3936         }
3937
3938         /* Map BAR5 to memory. */
3939         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
3940         if (rv < 0) {
3941                 dev_err(&pdev->dev, "Unable to map regions\n");
3942                 goto iomap_err;
3943         }
3944
3945         rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3946         if (rv) {
3947                 dev_warn(&pdev->dev, "64-bit DMA enable failed\n");
3948                 goto setmask_err;
3949         }
3950
3951         /* Copy the info we may need later into the private data structure. */
3952         dd->major       = mtip_major;
3953         dd->instance    = instance;
3954         dd->pdev        = pdev;
3955         dd->numa_node   = my_node;
3956
3957         INIT_LIST_HEAD(&dd->online_list);
3958         INIT_LIST_HEAD(&dd->remove_list);
3959
3960         memset(dd->workq_name, 0, 32);
3961         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
3962
3963         dd->isr_workq = create_workqueue(dd->workq_name);
3964         if (!dd->isr_workq) {
3965                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
3966                 rv = -ENOMEM;
3967                 goto setmask_err;
3968         }
3969
3970         memset(cpu_list, 0, sizeof(cpu_list));
3971
3972         node_mask = cpumask_of_node(dd->numa_node);
3973         if (!cpumask_empty(node_mask)) {
3974                 for_each_cpu(cpu, node_mask)
3975                 {
3976                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
3977                         j = strlen(cpu_list);
3978                 }
3979
3980                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
3981                         dd->numa_node,
3982                         topology_physical_package_id(cpumask_first(node_mask)),
3983                         nr_cpus_node(dd->numa_node),
3984                         cpu_list);
3985         } else
3986                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
3987
3988         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
3989         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
3990                 cpu_to_node(dd->isr_binding), dd->isr_binding);
3991
3992         /* first worker context always runs in ISR */
3993         dd->work[0].cpu_binding = dd->isr_binding;
3994         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
3995         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
3996         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
3997         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
3998         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
3999         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4000         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4001
4002         /* Log the bindings */
4003         for_each_present_cpu(cpu) {
4004                 memset(cpu_list, 0, sizeof(cpu_list));
4005                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4006                         if (dd->work[i].cpu_binding == cpu) {
4007                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4008                                 j = strlen(cpu_list);
4009                         }
4010                 }
4011                 if (j)
4012                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4013         }
4014
4015         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4016         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4017         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4018         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4019         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4020         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4021         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4022         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4023
4024         pci_set_master(pdev);
4025         rv = pci_enable_msi(pdev);
4026         if (rv) {
4027                 dev_warn(&pdev->dev,
4028                         "Unable to enable MSI interrupt.\n");
4029                 goto msi_initialize_err;
4030         }
4031
4032         mtip_fix_ero_nosnoop(dd, pdev);
4033
4034         /* Initialize the block layer. */
4035         rv = mtip_block_initialize(dd);
4036         if (rv < 0) {
4037                 dev_err(&pdev->dev,
4038                         "Unable to initialize block layer\n");
4039                 goto block_initialize_err;
4040         }
4041
4042         /*
4043          * Increment the instance count so that each device has a unique
4044          * instance number.
4045          */
4046         instance++;
4047         if (rv != MTIP_FTL_REBUILD_MAGIC)
4048                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4049         else
4050                 rv = 0; /* device in rebuild state, return 0 from probe */
4051
4052         /* Add to online list even if in ftl rebuild */
4053         spin_lock_irqsave(&dev_lock, flags);
4054         list_add(&dd->online_list, &online_list);
4055         spin_unlock_irqrestore(&dev_lock, flags);
4056
4057         goto done;
4058
4059 block_initialize_err:
4060         pci_disable_msi(pdev);
4061
4062 msi_initialize_err:
4063         if (dd->isr_workq) {
4064                 flush_workqueue(dd->isr_workq);
4065                 destroy_workqueue(dd->isr_workq);
4066                 drop_cpu(dd->work[0].cpu_binding);
4067                 drop_cpu(dd->work[1].cpu_binding);
4068                 drop_cpu(dd->work[2].cpu_binding);
4069         }
4070 setmask_err:
4071         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4072
4073 iomap_err:
4074         kfree(dd);
4075         pci_set_drvdata(pdev, NULL);
4076         return rv;
4077 done:
4078         return rv;
4079 }
4080
4081 /*
4082  * Called for each probed device when the device is removed or the
4083  * driver is unloaded.
4084  *
4085  * return value
4086  *      None
4087  */
4088 static void mtip_pci_remove(struct pci_dev *pdev)
4089 {
4090         struct driver_data *dd = pci_get_drvdata(pdev);
4091         unsigned long flags, to;
4092
4093         set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);
4094
4095         spin_lock_irqsave(&dev_lock, flags);
4096         list_del_init(&dd->online_list);
4097         list_add(&dd->remove_list, &removing_list);
4098         spin_unlock_irqrestore(&dev_lock, flags);
4099
4100         mtip_check_surprise_removal(pdev);
4101         synchronize_irq(dd->pdev->irq);
4102
4103         /* Spin until workers are done */
4104         to = jiffies + msecs_to_jiffies(4000);
4105         do {
4106                 msleep(20);
4107         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4108                 time_before(jiffies, to));
4109
4110         if (atomic_read(&dd->irq_workers_active) != 0) {
4111                 dev_warn(&dd->pdev->dev,
4112                         "Completion workers still active!\n");
4113         }
4114
4115         blk_set_queue_dying(dd->queue);
4116         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4117
4118         /* Clean up the block layer. */
4119         mtip_block_remove(dd);
4120
4121         if (dd->isr_workq) {
4122                 flush_workqueue(dd->isr_workq);
4123                 destroy_workqueue(dd->isr_workq);
4124                 drop_cpu(dd->work[0].cpu_binding);
4125                 drop_cpu(dd->work[1].cpu_binding);
4126                 drop_cpu(dd->work[2].cpu_binding);
4127         }
4128
4129         pci_disable_msi(pdev);
4130
4131         spin_lock_irqsave(&dev_lock, flags);
4132         list_del_init(&dd->remove_list);
4133         spin_unlock_irqrestore(&dev_lock, flags);
4134
4135         kfree(dd);
4136
4137         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4138         pci_set_drvdata(pdev, NULL);
4139 }
4140
4141 /*
4142  * Called for each probed device when the device is suspended.
4143  *
4144  * return value
4145  *      0  Success
4146  *      <0 Error
4147  */
4148 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4149 {
4150         int rv = 0;
4151         struct driver_data *dd = pci_get_drvdata(pdev);
4152
4153         if (!dd) {
4154                 dev_err(&pdev->dev,
4155                         "Driver private datastructure is NULL\n");
4156                 return -EFAULT;
4157         }
4158
4159         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4160
4161         /* Disable ports & interrupts then send standby immediate */
4162         rv = mtip_block_suspend(dd);
4163         if (rv < 0) {
4164                 dev_err(&pdev->dev,
4165                         "Failed to suspend controller\n");
4166                 return rv;
4167         }
4168
4169         /*
4170          * Save the pci config space to pdev structure &
4171          * disable the device
4172          */
4173         pci_save_state(pdev);
4174         pci_disable_device(pdev);
4175
4176         /* Move to Low power state*/
4177         pci_set_power_state(pdev, PCI_D3hot);
4178
4179         return rv;
4180 }
4181
4182 /*
4183  * Called for each probed device when the device is resumed.
4184  *
4185  * return value
4186  *      0  Success
4187  *      <0 Error
4188  */
4189 static int mtip_pci_resume(struct pci_dev *pdev)
4190 {
4191         int rv = 0;
4192         struct driver_data *dd;
4193
4194         dd = pci_get_drvdata(pdev);
4195         if (!dd) {
4196                 dev_err(&pdev->dev,
4197                         "Driver private datastructure is NULL\n");
4198                 return -EFAULT;
4199         }
4200
4201         /* Move the device to active State */
4202         pci_set_power_state(pdev, PCI_D0);
4203
4204         /* Restore PCI configuration space */
4205         pci_restore_state(pdev);
4206
4207         /* Enable the PCI device*/
4208         rv = pcim_enable_device(pdev);
4209         if (rv < 0) {
4210                 dev_err(&pdev->dev,
4211                         "Failed to enable card during resume\n");
4212                 goto err;
4213         }
4214         pci_set_master(pdev);
4215
4216         /*
4217          * Calls hbaReset, initPort, & startPort function
4218          * then enables interrupts
4219          */
4220         rv = mtip_block_resume(dd);
4221         if (rv < 0)
4222                 dev_err(&pdev->dev, "Unable to resume\n");
4223
4224 err:
4225         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4226
4227         return rv;
4228 }
4229
4230 /*
4231  * Shutdown routine
4232  *
4233  * return value
4234  *      None
4235  */
4236 static void mtip_pci_shutdown(struct pci_dev *pdev)
4237 {
4238         struct driver_data *dd = pci_get_drvdata(pdev);
4239         if (dd)
4240                 mtip_block_shutdown(dd);
4241 }
4242
4243 /* Table of device ids supported by this driver. */
4244 static const struct pci_device_id mtip_pci_tbl[] = {
4245         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4246         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4247         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4248         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4249         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4250         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4251         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4252         { 0 }
4253 };
4254
4255 /* Structure that describes the PCI driver functions. */
4256 static struct pci_driver mtip_pci_driver = {
4257         .name                   = MTIP_DRV_NAME,
4258         .id_table               = mtip_pci_tbl,
4259         .probe                  = mtip_pci_probe,
4260         .remove                 = mtip_pci_remove,
4261         .suspend                = mtip_pci_suspend,
4262         .resume                 = mtip_pci_resume,
4263         .shutdown               = mtip_pci_shutdown,
4264 };
4265
4266 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4267
4268 /*
4269  * Module initialization function.
4270  *
4271  * Called once when the module is loaded. This function allocates a major
4272  * block device number to the Cyclone devices and registers the PCI layer
4273  * of the driver.
4274  *
4275  * Return value
4276  *      0 on success else error code.
4277  */
4278 static int __init mtip_init(void)
4279 {
4280         int error;
4281
4282         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4283
4284         /* Allocate a major block device number to use with this driver. */
4285         error = register_blkdev(0, MTIP_DRV_NAME);
4286         if (error <= 0) {
4287                 pr_err("Unable to register block device (%d)\n",
4288                 error);
4289                 return -EBUSY;
4290         }
4291         mtip_major = error;
4292
4293         dfs_parent = debugfs_create_dir("rssd", NULL);
4294         if (IS_ERR_OR_NULL(dfs_parent)) {
4295                 pr_warn("Error creating debugfs parent\n");
4296                 dfs_parent = NULL;
4297         }
4298         if (dfs_parent) {
4299                 dfs_device_status = debugfs_create_file("device_status",
4300                                         0444, dfs_parent, NULL,
4301                                         &mtip_device_status_fops);
4302                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4303                         pr_err("Error creating device_status node\n");
4304                         dfs_device_status = NULL;
4305                 }
4306         }
4307
4308         /* Register our PCI operations. */
4309         error = pci_register_driver(&mtip_pci_driver);
4310         if (error) {
4311                 debugfs_remove(dfs_parent);
4312                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4313         }
4314
4315         return error;
4316 }
4317
4318 /*
4319  * Module de-initialization function.
4320  *
4321  * Called once when the module is unloaded. This function deallocates
4322  * the major block device number allocated by mtip_init() and
4323  * unregisters the PCI layer of the driver.
4324  *
4325  * Return value
4326  *      none
4327  */
4328 static void __exit mtip_exit(void)
4329 {
4330         /* Release the allocated major block device number. */
4331         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4332
4333         /* Unregister the PCI driver. */
4334         pci_unregister_driver(&mtip_pci_driver);
4335
4336         debugfs_remove_recursive(dfs_parent);
4337 }
4338
4339 MODULE_AUTHOR("Micron Technology, Inc");
4340 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4341 MODULE_LICENSE("GPL");
4342 MODULE_VERSION(MTIP_DRV_VERSION);
4343
4344 module_init(mtip_init);
4345 module_exit(mtip_exit);