drivers/block/skd_main.c

   1 /*
   2  * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST
   3  * was acquired by Western Digital in 2012.
   4  *
   5  * Copyright 2012 sTec, Inc.
   6  * Copyright (c) 2017 Western Digital Corporation or its affiliates.
   7  *
   8  * This file is part of the Linux kernel, and is made available under
   9  * the terms of the GNU General Public License version 2.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/pci.h>
  16 #include <linux/slab.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/blk-mq.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/compiler.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/delay.h>
  25 #include <linux/time.h>
  26 #include <linux/hdreg.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/completion.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/version.h>
  31 #include <linux/err.h>
  32 #include <linux/aer.h>
  33 #include <linux/wait.h>
  34 #include <linux/stringify.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/sg.h>
  37 #include <linux/io.h>
  38 #include <linux/uaccess.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "skd_s1120.h"
  42
  43 static int skd_dbg_level;
  44 static int skd_isr_comp_limit = 4;
  45
  46 #define SKD_ASSERT(expr) \
  47         do { \
  48                 if (unlikely(!(expr))) { \
  49                         pr_err("Assertion failed! %s,%s,%s,line=%d\n",  \
  50                                # expr, __FILE__, __func__, __LINE__); \
  51                 } \
  52         } while (0)
  53
  54 #define DRV_NAME "skd"
  55 #define PFX DRV_NAME ": "
  56
  57 MODULE_LICENSE("GPL");
  58
  59 MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver");
  60
  61 #define PCI_VENDOR_ID_STEC      0x1B39
  62 #define PCI_DEVICE_ID_S1120     0x0001
  63
  64 #define SKD_FUA_NV              (1 << 1)
  65 #define SKD_MINORS_PER_DEVICE   16
  66
  67 #define SKD_MAX_QUEUE_DEPTH     200u
  68
  69 #define SKD_PAUSE_TIMEOUT       (5 * 1000)
  70
  71 #define SKD_N_FITMSG_BYTES      (512u)
  72 #define SKD_MAX_REQ_PER_MSG     14
  73
  74 #define SKD_N_SPECIAL_FITMSG_BYTES      (128u)
  75
  76 /* SG elements are 32 bytes, so we can make this 4096 and still be under the
  77  * 128KB limit.  That allows 4096*4K = 16M xfer size
  78  */
  79 #define SKD_N_SG_PER_REQ_DEFAULT 256u
  80
  81 #define SKD_N_COMPLETION_ENTRY  256u
  82 #define SKD_N_READ_CAP_BYTES    (8u)
  83
  84 #define SKD_N_INTERNAL_BYTES    (512u)
  85
  86 #define SKD_SKCOMP_SIZE                                                 \
  87         ((sizeof(struct fit_completion_entry_v1) +                      \
  88           sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY)
  89
  90 /* 5 bits of uniqifier, 0xF800 */
  91 #define SKD_ID_TABLE_MASK       (3u << 8u)
  92 #define  SKD_ID_RW_REQUEST      (0u << 8u)
  93 #define  SKD_ID_INTERNAL        (1u << 8u)
  94 #define  SKD_ID_FIT_MSG         (3u << 8u)
  95 #define SKD_ID_SLOT_MASK        0x00FFu
  96 #define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
  97
  98 #define SKD_N_MAX_SECTORS 2048u
  99
 100 #define SKD_MAX_RETRIES 2u
 101
 102 #define SKD_TIMER_SECONDS(seconds) (seconds)
 103 #define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
 104
 105 #define INQ_STD_NBYTES 36
 106
 107 enum skd_drvr_state {
 108         SKD_DRVR_STATE_LOAD,
 109         SKD_DRVR_STATE_IDLE,
 110         SKD_DRVR_STATE_BUSY,
 111         SKD_DRVR_STATE_STARTING,
 112         SKD_DRVR_STATE_ONLINE,
 113         SKD_DRVR_STATE_PAUSING,
 114         SKD_DRVR_STATE_PAUSED,
 115         SKD_DRVR_STATE_RESTARTING,
 116         SKD_DRVR_STATE_RESUMING,
 117         SKD_DRVR_STATE_STOPPING,
 118         SKD_DRVR_STATE_FAULT,
 119         SKD_DRVR_STATE_DISAPPEARED,
 120         SKD_DRVR_STATE_PROTOCOL_MISMATCH,
 121         SKD_DRVR_STATE_BUSY_ERASE,
 122         SKD_DRVR_STATE_BUSY_SANITIZE,
 123         SKD_DRVR_STATE_BUSY_IMMINENT,
 124         SKD_DRVR_STATE_WAIT_BOOT,
 125         SKD_DRVR_STATE_SYNCING,
 126 };
 127
 128 #define SKD_WAIT_BOOT_TIMO      SKD_TIMER_SECONDS(90u)
 129 #define SKD_STARTING_TIMO       SKD_TIMER_SECONDS(8u)
 130 #define SKD_RESTARTING_TIMO     SKD_TIMER_MINUTES(4u)
 131 #define SKD_BUSY_TIMO           SKD_TIMER_MINUTES(20u)
 132 #define SKD_STARTED_BUSY_TIMO   SKD_TIMER_SECONDS(60u)
 133 #define SKD_START_WAIT_SECONDS  90u
 134
 135 enum skd_req_state {
 136         SKD_REQ_STATE_IDLE,
 137         SKD_REQ_STATE_SETUP,
 138         SKD_REQ_STATE_BUSY,
 139         SKD_REQ_STATE_COMPLETED,
 140         SKD_REQ_STATE_TIMEOUT,
 141 };
 142
 143 enum skd_check_status_action {
 144         SKD_CHECK_STATUS_REPORT_GOOD,
 145         SKD_CHECK_STATUS_REPORT_SMART_ALERT,
 146         SKD_CHECK_STATUS_REQUEUE_REQUEST,
 147         SKD_CHECK_STATUS_REPORT_ERROR,
 148         SKD_CHECK_STATUS_BUSY_IMMINENT,
 149 };
 150
 151 struct skd_msg_buf {
 152         struct fit_msg_hdr      fmh;
 153         struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
 154 };
 155
 156 struct skd_fitmsg_context {
 157         u32 id;
 158
 159         u32 length;
 160
 161         struct skd_msg_buf *msg_buf;
 162         dma_addr_t mb_dma_address;
 163 };
 164
 165 struct skd_request_context {
 166         enum skd_req_state state;
 167
 168         u16 id;
 169         u32 fitmsg_id;
 170
 171         u8 flush_cmd;
 172
 173         enum dma_data_direction data_dir;
 174         struct scatterlist *sg;
 175         u32 n_sg;
 176         u32 sg_byte_count;
 177
 178         struct fit_sg_descriptor *sksg_list;
 179         dma_addr_t sksg_dma_address;
 180
 181         struct fit_completion_entry_v1 completion;
 182
 183         struct fit_comp_error_info err_info;
 184         int retries;
 185
 186         blk_status_t status;
 187 };
 188
 189 struct skd_special_context {
 190         struct skd_request_context req;
 191
 192         void *data_buf;
 193         dma_addr_t db_dma_address;
 194
 195         struct skd_msg_buf *msg_buf;
 196         dma_addr_t mb_dma_address;
 197 };
 198
 199 typedef enum skd_irq_type {
 200         SKD_IRQ_LEGACY,
 201         SKD_IRQ_MSI,
 202         SKD_IRQ_MSIX
 203 } skd_irq_type_t;
 204
 205 #define SKD_MAX_BARS                    2
 206
 207 struct skd_device {
 208         void __iomem *mem_map[SKD_MAX_BARS];
 209         resource_size_t mem_phys[SKD_MAX_BARS];
 210         u32 mem_size[SKD_MAX_BARS];
 211
 212         struct skd_msix_entry *msix_entries;
 213
 214         struct pci_dev *pdev;
 215         int pcie_error_reporting_is_enabled;
 216
 217         spinlock_t lock;
 218         struct gendisk *disk;
 219         struct blk_mq_tag_set tag_set;
 220         struct request_queue *queue;
 221         struct skd_fitmsg_context *skmsg;
 222         struct device *class_dev;
 223         int gendisk_on;
 224         int sync_done;
 225
 226         u32 devno;
 227         u32 major;
 228         char isr_name[30];
 229
 230         enum skd_drvr_state state;
 231         u32 drive_state;
 232
 233         u32 cur_max_queue_depth;
 234         u32 queue_low_water_mark;
 235         u32 dev_max_queue_depth;
 236
 237         u32 num_fitmsg_context;
 238         u32 num_req_context;
 239
 240         struct skd_fitmsg_context *skmsg_table;
 241
 242         struct skd_special_context internal_skspcl;
 243         u32 read_cap_blocksize;
 244         u32 read_cap_last_lba;
 245         int read_cap_is_valid;
 246         int inquiry_is_valid;
 247         u8 inq_serial_num[13];  /*12 chars plus null term */
 248
 249         u8 skcomp_cycle;
 250         u32 skcomp_ix;
 251         struct kmem_cache *msgbuf_cache;
 252         struct kmem_cache *sglist_cache;
 253         struct kmem_cache *databuf_cache;
 254         struct fit_completion_entry_v1 *skcomp_table;
 255         struct fit_comp_error_info *skerr_table;
 256         dma_addr_t cq_dma_address;
 257
 258         wait_queue_head_t waitq;
 259
 260         struct timer_list timer;
 261         u32 timer_countdown;
 262         u32 timer_substate;
 263
 264         int sgs_per_request;
 265         u32 last_mtd;
 266
 267         u32 proto_ver;
 268
 269         int dbg_level;
 270         u32 connect_time_stamp;
 271         int connect_retries;
 272 #define SKD_MAX_CONNECT_RETRIES 16
 273         u32 drive_jiffies;
 274
 275         u32 timo_slot;
 276
 277         struct work_struct start_queue;
 278         struct work_struct completion_worker;
 279 };
 280
 281 #define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
 282 #define SKD_READL(DEV, OFF)      skd_reg_read32(DEV, OFF)
 283 #define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
 284
 285 static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
 286 {
 287         u32 val = readl(skdev->mem_map[1] + offset);
 288
 289         if (unlikely(skdev->dbg_level >= 2))
 290                 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
 291         return val;
 292 }
 293
 294 static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
 295                                    u32 offset)
 296 {
 297         writel(val, skdev->mem_map[1] + offset);
 298         if (unlikely(skdev->dbg_level >= 2))
 299                 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
 300 }
 301
 302 static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
 303                                    u32 offset)
 304 {
 305         writeq(val, skdev->mem_map[1] + offset);
 306         if (unlikely(skdev->dbg_level >= 2))
 307                 dev_dbg(&skdev->pdev->dev, "offset %x = %016llx\n", offset,
 308                         val);
 309 }
 310
 311
 312 #define SKD_IRQ_DEFAULT SKD_IRQ_MSIX
 313 static int skd_isr_type = SKD_IRQ_DEFAULT;
 314
 315 module_param(skd_isr_type, int, 0444);
 316 MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
 317                  " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
 318
 319 #define SKD_MAX_REQ_PER_MSG_DEFAULT 1
 320 static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
 321
 322 module_param(skd_max_req_per_msg, int, 0444);
 323 MODULE_PARM_DESC(skd_max_req_per_msg,
 324                  "Maximum SCSI requests packed in a single message."
 325                  " (1-" __stringify(SKD_MAX_REQ_PER_MSG) ", default==1)");
 326
 327 #define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
 328 #define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
 329 static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
 330
 331 module_param(skd_max_queue_depth, int, 0444);
 332 MODULE_PARM_DESC(skd_max_queue_depth,
 333                  "Maximum SCSI requests issued to s1120."
 334                  " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
 335
 336 static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
 337 module_param(skd_sgs_per_request, int, 0444);
 338 MODULE_PARM_DESC(skd_sgs_per_request,
 339                  "Maximum SG elements per block request."
 340                  " (1-4096, default==256)");
 341
 342 static int skd_max_pass_thru = 1;
 343 module_param(skd_max_pass_thru, int, 0444);
 344 MODULE_PARM_DESC(skd_max_pass_thru,
 345                  "Maximum SCSI pass-thru at a time. IGNORED");
 346
 347 module_param(skd_dbg_level, int, 0444);
 348 MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
 349
 350 module_param(skd_isr_comp_limit, int, 0444);
 351 MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
 352
 353 /* Major device number dynamically assigned. */
 354 static u32 skd_major;
 355
 356 static void skd_destruct(struct skd_device *skdev);
 357 static const struct block_device_operations skd_blockdev_ops;
 358 static void skd_send_fitmsg(struct skd_device *skdev,
 359                             struct skd_fitmsg_context *skmsg);
 360 static void skd_send_special_fitmsg(struct skd_device *skdev,
 361                                     struct skd_special_context *skspcl);
 362 static bool skd_preop_sg_list(struct skd_device *skdev,
 363                              struct skd_request_context *skreq);
 364 static void skd_postop_sg_list(struct skd_device *skdev,
 365                                struct skd_request_context *skreq);
 366
 367 static void skd_restart_device(struct skd_device *skdev);
 368 static int skd_quiesce_dev(struct skd_device *skdev);
 369 static int skd_unquiesce_dev(struct skd_device *skdev);
 370 static void skd_disable_interrupts(struct skd_device *skdev);
 371 static void skd_isr_fwstate(struct skd_device *skdev);
 372 static void skd_recover_requests(struct skd_device *skdev);
 373 static void skd_soft_reset(struct skd_device *skdev);
 374
 375 const char *skd_drive_state_to_str(int state);
 376 const char *skd_skdev_state_to_str(enum skd_drvr_state state);
 377 static void skd_log_skdev(struct skd_device *skdev, const char *event);
 378 static void skd_log_skreq(struct skd_device *skdev,
 379                           struct skd_request_context *skreq, const char *event);
 380
 381 /*
 382  *****************************************************************************
 383  * READ/WRITE REQUESTS
 384  *****************************************************************************
 385  */
 386 static bool skd_inc_in_flight(struct request *rq, void *data, bool reserved)
 387 {
 388         int *count = data;
 389
 390         count++;
 391         return true;
 392 }
 393
 394 static int skd_in_flight(struct skd_device *skdev)
 395 {
 396         int count = 0;
 397
 398         blk_mq_tagset_busy_iter(&skdev->tag_set, skd_inc_in_flight, &count);
 399
 400         return count;
 401 }
 402
 403 static void
 404 skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
 405                 int data_dir, unsigned lba,
 406                 unsigned count)
 407 {
 408         if (data_dir == READ)
 409                 scsi_req->cdb[0] = READ_10;
 410         else
 411                 scsi_req->cdb[0] = WRITE_10;
 412
 413         scsi_req->cdb[1] = 0;
 414         scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
 415         scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
 416         scsi_req->cdb[4] = (lba & 0xff00) >> 8;
 417         scsi_req->cdb[5] = (lba & 0xff);
 418         scsi_req->cdb[6] = 0;
 419         scsi_req->cdb[7] = (count & 0xff00) >> 8;
 420         scsi_req->cdb[8] = count & 0xff;
 421         scsi_req->cdb[9] = 0;
 422 }
 423
 424 static void
 425 skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
 426                             struct skd_request_context *skreq)
 427 {
 428         skreq->flush_cmd = 1;
 429
 430         scsi_req->cdb[0] = SYNCHRONIZE_CACHE;
 431         scsi_req->cdb[1] = 0;
 432         scsi_req->cdb[2] = 0;
 433         scsi_req->cdb[3] = 0;
 434         scsi_req->cdb[4] = 0;
 435         scsi_req->cdb[5] = 0;
 436         scsi_req->cdb[6] = 0;
 437         scsi_req->cdb[7] = 0;
 438         scsi_req->cdb[8] = 0;
 439         scsi_req->cdb[9] = 0;
 440 }
 441
 442 /*
 443  * Return true if and only if all pending requests should be failed.
 444  */
 445 static bool skd_fail_all(struct request_queue *q)
 446 {
 447         struct skd_device *skdev = q->queuedata;
 448
 449         SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
 450
 451         skd_log_skdev(skdev, "req_not_online");
 452         switch (skdev->state) {
 453         case SKD_DRVR_STATE_PAUSING:
 454         case SKD_DRVR_STATE_PAUSED:
 455         case SKD_DRVR_STATE_STARTING:
 456         case SKD_DRVR_STATE_RESTARTING:
 457         case SKD_DRVR_STATE_WAIT_BOOT:
 458         /* In case of starting, we haven't started the queue,
 459          * so we can't get here... but requests are
 460          * possibly hanging out waiting for us because we
 461          * reported the dev/skd0 already.  They'll wait
 462          * forever if connect doesn't complete.
 463          * What to do??? delay dev/skd0 ??
 464          */
 465         case SKD_DRVR_STATE_BUSY:
 466         case SKD_DRVR_STATE_BUSY_IMMINENT:
 467         case SKD_DRVR_STATE_BUSY_ERASE:
 468                 return false;
 469
 470         case SKD_DRVR_STATE_BUSY_SANITIZE:
 471         case SKD_DRVR_STATE_STOPPING:
 472         case SKD_DRVR_STATE_SYNCING:
 473         case SKD_DRVR_STATE_FAULT:
 474         case SKD_DRVR_STATE_DISAPPEARED:
 475         default:
 476                 return true;
 477         }
 478 }
 479
 480 static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
 481                                     const struct blk_mq_queue_data *mqd)
 482 {
 483         struct request *const req = mqd->rq;
 484         struct request_queue *const q = req->q;
 485         struct skd_device *skdev = q->queuedata;
 486         struct skd_fitmsg_context *skmsg;
 487         struct fit_msg_hdr *fmh;
 488         const u32 tag = blk_mq_unique_tag(req);
 489         struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req);
 490         struct skd_scsi_request *scsi_req;
 491         unsigned long flags = 0;
 492         const u32 lba = blk_rq_pos(req);
 493         const u32 count = blk_rq_sectors(req);
 494         const int data_dir = rq_data_dir(req);
 495
 496         if (unlikely(skdev->state != SKD_DRVR_STATE_ONLINE))
 497                 return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE;
 498
 499         if (!(req->rq_flags & RQF_DONTPREP)) {
 500                 skreq->retries = 0;
 501                 req->rq_flags |= RQF_DONTPREP;
 502         }
 503
 504         blk_mq_start_request(req);
 505
 506         WARN_ONCE(tag >= skd_max_queue_depth, "%#x > %#x (nr_requests = %lu)\n",
 507                   tag, skd_max_queue_depth, q->nr_requests);
 508
 509         SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
 510
 511         dev_dbg(&skdev->pdev->dev,
 512                 "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba,
 513                 lba, count, count, data_dir);
 514
 515         skreq->id = tag + SKD_ID_RW_REQUEST;
 516         skreq->flush_cmd = 0;
 517         skreq->n_sg = 0;
 518         skreq->sg_byte_count = 0;
 519
 520         skreq->fitmsg_id = 0;
 521
 522         skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 523
 524         if (req->bio && !skd_preop_sg_list(skdev, skreq)) {
 525                 dev_dbg(&skdev->pdev->dev, "error Out\n");
 526                 skreq->status = BLK_STS_RESOURCE;
 527                 blk_mq_complete_request(req);
 528                 return BLK_STS_OK;
 529         }
 530
 531         dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address,
 532                                    skreq->n_sg *
 533                                    sizeof(struct fit_sg_descriptor),
 534                                    DMA_TO_DEVICE);
 535
 536         /* Either a FIT msg is in progress or we have to start one. */
 537         if (skd_max_req_per_msg == 1) {
 538                 skmsg = NULL;
 539         } else {
 540                 spin_lock_irqsave(&skdev->lock, flags);
 541                 skmsg = skdev->skmsg;
 542         }
 543         if (!skmsg) {
 544                 skmsg = &skdev->skmsg_table[tag];
 545                 skdev->skmsg = skmsg;
 546
 547                 /* Initialize the FIT msg header */
 548                 fmh = &skmsg->msg_buf->fmh;
 549                 memset(fmh, 0, sizeof(*fmh));
 550                 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
 551                 skmsg->length = sizeof(*fmh);
 552         } else {
 553                 fmh = &skmsg->msg_buf->fmh;
 554         }
 555
 556         skreq->fitmsg_id = skmsg->id;
 557
 558         scsi_req = &skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
 559         memset(scsi_req, 0, sizeof(*scsi_req));
 560
 561         scsi_req->hdr.tag = skreq->id;
 562         scsi_req->hdr.sg_list_dma_address =
 563                 cpu_to_be64(skreq->sksg_dma_address);
 564
 565         if (req_op(req) == REQ_OP_FLUSH) {
 566                 skd_prep_zerosize_flush_cdb(scsi_req, skreq);
 567                 SKD_ASSERT(skreq->flush_cmd == 1);
 568         } else {
 569                 skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
 570         }
 571
 572         if (req->cmd_flags & REQ_FUA)
 573                 scsi_req->cdb[1] |= SKD_FUA_NV;
 574
 575         scsi_req->hdr.sg_list_len_bytes = cpu_to_be32(skreq->sg_byte_count);
 576
 577         /* Complete resource allocations. */
 578         skreq->state = SKD_REQ_STATE_BUSY;
 579
 580         skmsg->length += sizeof(struct skd_scsi_request);
 581         fmh->num_protocol_cmds_coalesced++;
 582
 583         dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id,
 584                 skd_in_flight(skdev));
 585
 586         /*
 587          * If the FIT msg buffer is full send it.
 588          */
 589         if (skd_max_req_per_msg == 1) {
 590                 skd_send_fitmsg(skdev, skmsg);
 591         } else {
 592                 if (mqd->last ||
 593                     fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
 594                         skd_send_fitmsg(skdev, skmsg);
 595                         skdev->skmsg = NULL;
 596                 }
 597                 spin_unlock_irqrestore(&skdev->lock, flags);
 598         }
 599
 600         return BLK_STS_OK;
 601 }
 602
 603 static enum blk_eh_timer_return skd_timed_out(struct request *req,
 604                                               bool reserved)
 605 {
 606         struct skd_device *skdev = req->q->queuedata;
 607
 608         dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n",
 609                 blk_mq_unique_tag(req));
 610
 611         return BLK_EH_RESET_TIMER;
 612 }
 613
 614 static void skd_complete_rq(struct request *req)
 615 {
 616         struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
 617
 618         blk_mq_end_request(req, skreq->status);
 619 }
 620
 621 static bool skd_preop_sg_list(struct skd_device *skdev,
 622                              struct skd_request_context *skreq)
 623 {
 624         struct request *req = blk_mq_rq_from_pdu(skreq);
 625         struct scatterlist *sgl = &skreq->sg[0], *sg;
 626         int n_sg;
 627         int i;
 628
 629         skreq->sg_byte_count = 0;
 630
 631         WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE &&
 632                      skreq->data_dir != DMA_FROM_DEVICE);
 633
 634         n_sg = blk_rq_map_sg(skdev->queue, req, sgl);
 635         if (n_sg <= 0)
 636                 return false;
 637
 638         /*
 639          * Map scatterlist to PCI bus addresses.
 640          * Note PCI might change the number of entries.
 641          */
 642         n_sg = dma_map_sg(&skdev->pdev->dev, sgl, n_sg, skreq->data_dir);
 643         if (n_sg <= 0)
 644                 return false;
 645
 646         SKD_ASSERT(n_sg <= skdev->sgs_per_request);
 647
 648         skreq->n_sg = n_sg;
 649
 650         for_each_sg(sgl, sg, n_sg, i) {
 651                 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
 652                 u32 cnt = sg_dma_len(sg);
 653                 uint64_t dma_addr = sg_dma_address(sg);
 654
 655                 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
 656                 sgd->byte_count = cnt;
 657                 skreq->sg_byte_count += cnt;
 658                 sgd->host_side_addr = dma_addr;
 659                 sgd->dev_side_addr = 0;
 660         }
 661
 662         skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
 663         skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
 664
 665         if (unlikely(skdev->dbg_level > 1)) {
 666                 dev_dbg(&skdev->pdev->dev,
 667                         "skreq=%x sksg_list=%p sksg_dma=%pad\n",
 668                         skreq->id, skreq->sksg_list, &skreq->sksg_dma_address);
 669                 for (i = 0; i < n_sg; i++) {
 670                         struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
 671
 672                         dev_dbg(&skdev->pdev->dev,
 673                                 "  sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
 674                                 i, sgd->byte_count, sgd->control,
 675                                 sgd->host_side_addr, sgd->next_desc_ptr);
 676                 }
 677         }
 678
 679         return true;
 680 }
 681
 682 static void skd_postop_sg_list(struct skd_device *skdev,
 683                                struct skd_request_context *skreq)
 684 {
 685         /*
 686          * restore the next ptr for next IO request so we
 687          * don't have to set it every time.
 688          */
 689         skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
 690                 skreq->sksg_dma_address +
 691                 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
 692         dma_unmap_sg(&skdev->pdev->dev, &skreq->sg[0], skreq->n_sg,
 693                      skreq->data_dir);
 694 }
 695
 696 /*
 697  *****************************************************************************
 698  * TIMER
 699  *****************************************************************************
 700  */
 701
 702 static void skd_timer_tick_not_online(struct skd_device *skdev);
 703
 704 static void skd_start_queue(struct work_struct *work)
 705 {
 706         struct skd_device *skdev = container_of(work, typeof(*skdev),
 707                                                 start_queue);
 708
 709         /*
 710          * Although it is safe to call blk_start_queue() from interrupt
 711          * context, blk_mq_start_hw_queues() must not be called from
 712          * interrupt context.
 713          */
 714         blk_mq_start_hw_queues(skdev->queue);
 715 }
 716
 717 static void skd_timer_tick(struct timer_list *t)
 718 {
 719         struct skd_device *skdev = from_timer(skdev, t, timer);
 720         unsigned long reqflags;
 721         u32 state;
 722
 723         if (skdev->state == SKD_DRVR_STATE_FAULT)
 724                 /* The driver has declared fault, and we want it to
 725                  * stay that way until driver is reloaded.
 726                  */
 727                 return;
 728
 729         spin_lock_irqsave(&skdev->lock, reqflags);
 730
 731         state = SKD_READL(skdev, FIT_STATUS);
 732         state &= FIT_SR_DRIVE_STATE_MASK;
 733         if (state != skdev->drive_state)
 734                 skd_isr_fwstate(skdev);
 735
 736         if (skdev->state != SKD_DRVR_STATE_ONLINE)
 737                 skd_timer_tick_not_online(skdev);
 738
 739         mod_timer(&skdev->timer, (jiffies + HZ));
 740
 741         spin_unlock_irqrestore(&skdev->lock, reqflags);
 742 }
 743
 744 static void skd_timer_tick_not_online(struct skd_device *skdev)
 745 {
 746         switch (skdev->state) {
 747         case SKD_DRVR_STATE_IDLE:
 748         case SKD_DRVR_STATE_LOAD:
 749                 break;
 750         case SKD_DRVR_STATE_BUSY_SANITIZE:
 751                 dev_dbg(&skdev->pdev->dev,
 752                         "drive busy sanitize[%x], driver[%x]\n",
 753                         skdev->drive_state, skdev->state);
 754                 /* If we've been in sanitize for 3 seconds, we figure we're not
 755                  * going to get anymore completions, so recover requests now
 756                  */
 757                 if (skdev->timer_countdown > 0) {
 758                         skdev->timer_countdown--;
 759                         return;
 760                 }
 761                 skd_recover_requests(skdev);
 762                 break;
 763
 764         case SKD_DRVR_STATE_BUSY:
 765         case SKD_DRVR_STATE_BUSY_IMMINENT:
 766         case SKD_DRVR_STATE_BUSY_ERASE:
 767                 dev_dbg(&skdev->pdev->dev, "busy[%x], countdown=%d\n",
 768                         skdev->state, skdev->timer_countdown);
 769                 if (skdev->timer_countdown > 0) {
 770                         skdev->timer_countdown--;
 771                         return;
 772                 }
 773                 dev_dbg(&skdev->pdev->dev,
 774                         "busy[%x], timedout=%d, restarting device.",
 775                         skdev->state, skdev->timer_countdown);
 776                 skd_restart_device(skdev);
 777                 break;
 778
 779         case SKD_DRVR_STATE_WAIT_BOOT:
 780         case SKD_DRVR_STATE_STARTING:
 781                 if (skdev->timer_countdown > 0) {
 782                         skdev->timer_countdown--;
 783                         return;
 784                 }
 785                 /* For now, we fault the drive.  Could attempt resets to
 786                  * revcover at some point. */
 787                 skdev->state = SKD_DRVR_STATE_FAULT;
 788
 789                 dev_err(&skdev->pdev->dev, "DriveFault Connect Timeout (%x)\n",
 790                         skdev->drive_state);
 791
 792                 /*start the queue so we can respond with error to requests */
 793                 /* wakeup anyone waiting for startup complete */
 794                 schedule_work(&skdev->start_queue);
 795                 skdev->gendisk_on = -1;
 796                 wake_up_interruptible(&skdev->waitq);
 797                 break;
 798
 799         case SKD_DRVR_STATE_ONLINE:
 800                 /* shouldn't get here. */
 801                 break;
 802
 803         case SKD_DRVR_STATE_PAUSING:
 804         case SKD_DRVR_STATE_PAUSED:
 805                 break;
 806
 807         case SKD_DRVR_STATE_RESTARTING:
 808                 if (skdev->timer_countdown > 0) {
 809                         skdev->timer_countdown--;
 810                         return;
 811                 }
 812                 /* For now, we fault the drive. Could attempt resets to
 813                  * revcover at some point. */
 814                 skdev->state = SKD_DRVR_STATE_FAULT;
 815                 dev_err(&skdev->pdev->dev,
 816                         "DriveFault Reconnect Timeout (%x)\n",
 817                         skdev->drive_state);
 818
 819                 /*
 820                  * Recovering does two things:
 821                  * 1. completes IO with error
 822                  * 2. reclaims dma resources
 823                  * When is it safe to recover requests?
 824                  * - if the drive state is faulted
 825                  * - if the state is still soft reset after out timeout
 826                  * - if the drive registers are dead (state = FF)
 827                  * If it is "unsafe", we still need to recover, so we will
 828                  * disable pci bus mastering and disable our interrupts.
 829                  */
 830
 831                 if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
 832                     (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
 833                     (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
 834                         /* It never came out of soft reset. Try to
 835                          * recover the requests and then let them
 836                          * fail. This is to mitigate hung processes. */
 837                         skd_recover_requests(skdev);
 838                 else {
 839                         dev_err(&skdev->pdev->dev, "Disable BusMaster (%x)\n",
 840                                 skdev->drive_state);
 841                         pci_disable_device(skdev->pdev);
 842                         skd_disable_interrupts(skdev);
 843                         skd_recover_requests(skdev);
 844                 }
 845
 846                 /*start the queue so we can respond with error to requests */
 847                 /* wakeup anyone waiting for startup complete */
 848                 schedule_work(&skdev->start_queue);
 849                 skdev->gendisk_on = -1;
 850                 wake_up_interruptible(&skdev->waitq);
 851                 break;
 852
 853         case SKD_DRVR_STATE_RESUMING:
 854         case SKD_DRVR_STATE_STOPPING:
 855         case SKD_DRVR_STATE_SYNCING:
 856         case SKD_DRVR_STATE_FAULT:
 857         case SKD_DRVR_STATE_DISAPPEARED:
 858         default:
 859                 break;
 860         }
 861 }
 862
 863 static int skd_start_timer(struct skd_device *skdev)
 864 {
 865         int rc;
 866
 867         timer_setup(&skdev->timer, skd_timer_tick, 0);
 868
 869         rc = mod_timer(&skdev->timer, (jiffies + HZ));
 870         if (rc)
 871                 dev_err(&skdev->pdev->dev, "failed to start timer %d\n", rc);
 872         return rc;
 873 }
 874
 875 static void skd_kill_timer(struct skd_device *skdev)
 876 {
 877         del_timer_sync(&skdev->timer);
 878 }
 879
 880 /*
 881  *****************************************************************************
 882  * INTERNAL REQUESTS -- generated by driver itself
 883  *****************************************************************************
 884  */
 885
 886 static int skd_format_internal_skspcl(struct skd_device *skdev)
 887 {
 888         struct skd_special_context *skspcl = &skdev->internal_skspcl;
 889         struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
 890         struct fit_msg_hdr *fmh;
 891         uint64_t dma_address;
 892         struct skd_scsi_request *scsi;
 893
 894         fmh = &skspcl->msg_buf->fmh;
 895         fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
 896         fmh->num_protocol_cmds_coalesced = 1;
 897
 898         scsi = &skspcl->msg_buf->scsi[0];
 899         memset(scsi, 0, sizeof(*scsi));
 900         dma_address = skspcl->req.sksg_dma_address;
 901         scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
 902         skspcl->req.n_sg = 1;
 903         sgd->control = FIT_SGD_CONTROL_LAST;
 904         sgd->byte_count = 0;
 905         sgd->host_side_addr = skspcl->db_dma_address;
 906         sgd->dev_side_addr = 0;
 907         sgd->next_desc_ptr = 0LL;
 908
 909         return 1;
 910 }
 911
 912 #define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
 913
 914 static void skd_send_internal_skspcl(struct skd_device *skdev,
 915                                      struct skd_special_context *skspcl,
 916                                      u8 opcode)
 917 {
 918         struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
 919         struct skd_scsi_request *scsi;
 920         unsigned char *buf = skspcl->data_buf;
 921         int i;
 922
 923         if (skspcl->req.state != SKD_REQ_STATE_IDLE)
 924                 /*
 925                  * A refresh is already in progress.
 926                  * Just wait for it to finish.
 927                  */
 928                 return;
 929
 930         skspcl->req.state = SKD_REQ_STATE_BUSY;
 931
 932         scsi = &skspcl->msg_buf->scsi[0];
 933         scsi->hdr.tag = skspcl->req.id;
 934
 935         memset(scsi->cdb, 0, sizeof(scsi->cdb));
 936
 937         switch (opcode) {
 938         case TEST_UNIT_READY:
 939                 scsi->cdb[0] = TEST_UNIT_READY;
 940                 sgd->byte_count = 0;
 941                 scsi->hdr.sg_list_len_bytes = 0;
 942                 break;
 943
 944         case READ_CAPACITY:
 945                 scsi->cdb[0] = READ_CAPACITY;
 946                 sgd->byte_count = SKD_N_READ_CAP_BYTES;
 947                 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
 948                 break;
 949
 950         case INQUIRY:
 951                 scsi->cdb[0] = INQUIRY;
 952                 scsi->cdb[1] = 0x01;    /* evpd */
 953                 scsi->cdb[2] = 0x80;    /* serial number page */
 954                 scsi->cdb[4] = 0x10;
 955                 sgd->byte_count = 16;
 956                 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
 957                 break;
 958
 959         case SYNCHRONIZE_CACHE:
 960                 scsi->cdb[0] = SYNCHRONIZE_CACHE;
 961                 sgd->byte_count = 0;
 962                 scsi->hdr.sg_list_len_bytes = 0;
 963                 break;
 964
 965         case WRITE_BUFFER:
 966                 scsi->cdb[0] = WRITE_BUFFER;
 967                 scsi->cdb[1] = 0x02;
 968                 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
 969                 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
 970                 sgd->byte_count = WR_BUF_SIZE;
 971                 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
 972                 /* fill incrementing byte pattern */
 973                 for (i = 0; i < sgd->byte_count; i++)
 974                         buf[i] = i & 0xFF;
 975                 break;
 976
 977         case READ_BUFFER:
 978                 scsi->cdb[0] = READ_BUFFER;
 979                 scsi->cdb[1] = 0x02;
 980                 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
 981                 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
 982                 sgd->byte_count = WR_BUF_SIZE;
 983                 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
 984                 memset(skspcl->data_buf, 0, sgd->byte_count);
 985                 break;
 986
 987         default:
 988                 SKD_ASSERT("Don't know what to send");
 989                 return;
 990
 991         }
 992         skd_send_special_fitmsg(skdev, skspcl);
 993 }
 994
 995 static void skd_refresh_device_data(struct skd_device *skdev)
 996 {
 997         struct skd_special_context *skspcl = &skdev->internal_skspcl;
 998
 999         skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
1000 }
1001
1002 static int skd_chk_read_buf(struct skd_device *skdev,
1003                             struct skd_special_context *skspcl)
1004 {
1005         unsigned char *buf = skspcl->data_buf;
1006         int i;
1007
1008         /* check for incrementing byte pattern */
1009         for (i = 0; i < WR_BUF_SIZE; i++)
1010                 if (buf[i] != (i & 0xFF))
1011                         return 1;
1012
1013         return 0;
1014 }
1015
1016 static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
1017                                  u8 code, u8 qual, u8 fruc)
1018 {
1019         /* If the check condition is of special interest, log a message */
1020         if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
1021             && (code == 0x04) && (qual == 0x06)) {
1022                 dev_err(&skdev->pdev->dev,
1023                         "*** LOST_WRITE_DATA ERROR *** key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1024                         key, code, qual, fruc);
1025         }
1026 }
1027
1028 static void skd_complete_internal(struct skd_device *skdev,
1029                                   struct fit_completion_entry_v1 *skcomp,
1030                                   struct fit_comp_error_info *skerr,
1031                                   struct skd_special_context *skspcl)
1032 {
1033         u8 *buf = skspcl->data_buf;
1034         u8 status;
1035         int i;
1036         struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0];
1037
1038         lockdep_assert_held(&skdev->lock);
1039
1040         SKD_ASSERT(skspcl == &skdev->internal_skspcl);
1041
1042         dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]);
1043
1044         dma_sync_single_for_cpu(&skdev->pdev->dev,
1045                                 skspcl->db_dma_address,
1046                                 skspcl->req.sksg_list[0].byte_count,
1047                                 DMA_BIDIRECTIONAL);
1048
1049         skspcl->req.completion = *skcomp;
1050         skspcl->req.state = SKD_REQ_STATE_IDLE;
1051
1052         status = skspcl->req.completion.status;
1053
1054         skd_log_check_status(skdev, status, skerr->key, skerr->code,
1055                              skerr->qual, skerr->fruc);
1056
1057         switch (scsi->cdb[0]) {
1058         case TEST_UNIT_READY:
1059                 if (status == SAM_STAT_GOOD)
1060                         skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1061                 else if ((status == SAM_STAT_CHECK_CONDITION) &&
1062                          (skerr->key == MEDIUM_ERROR))
1063                         skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1064                 else {
1065                         if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1066                                 dev_dbg(&skdev->pdev->dev,
1067                                         "TUR failed, don't send anymore state 0x%x\n",
1068                                         skdev->state);
1069                                 return;
1070                         }
1071                         dev_dbg(&skdev->pdev->dev,
1072                                 "**** TUR failed, retry skerr\n");
1073                         skd_send_internal_skspcl(skdev, skspcl,
1074                                                  TEST_UNIT_READY);
1075                 }
1076                 break;
1077
1078         case WRITE_BUFFER:
1079                 if (status == SAM_STAT_GOOD)
1080                         skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
1081                 else {
1082                         if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1083                                 dev_dbg(&skdev->pdev->dev,
1084                                         "write buffer failed, don't send anymore state 0x%x\n",
1085                                         skdev->state);
1086                                 return;
1087                         }
1088                         dev_dbg(&skdev->pdev->dev,
1089                                 "**** write buffer failed, retry skerr\n");
1090                         skd_send_internal_skspcl(skdev, skspcl,
1091                                                  TEST_UNIT_READY);
1092                 }
1093                 break;
1094
1095         case READ_BUFFER:
1096                 if (status == SAM_STAT_GOOD) {
1097                         if (skd_chk_read_buf(skdev, skspcl) == 0)
1098                                 skd_send_internal_skspcl(skdev, skspcl,
1099                                                          READ_CAPACITY);
1100                         else {
1101                                 dev_err(&skdev->pdev->dev,
1102                                         "*** W/R Buffer mismatch %d ***\n",
1103                                         skdev->connect_retries);
1104                                 if (skdev->connect_retries <
1105                                     SKD_MAX_CONNECT_RETRIES) {
1106                                         skdev->connect_retries++;
1107                                         skd_soft_reset(skdev);
1108                                 } else {
1109                                         dev_err(&skdev->pdev->dev,
1110                                                 "W/R Buffer Connect Error\n");
1111                                         return;
1112                                 }
1113                         }
1114
1115                 } else {
1116                         if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1117                                 dev_dbg(&skdev->pdev->dev,
1118                                         "read buffer failed, don't send anymore state 0x%x\n",
1119                                         skdev->state);
1120                                 return;
1121                         }
1122                         dev_dbg(&skdev->pdev->dev,
1123                                 "**** read buffer failed, retry skerr\n");
1124                         skd_send_internal_skspcl(skdev, skspcl,
1125                                                  TEST_UNIT_READY);
1126                 }
1127                 break;
1128
1129         case READ_CAPACITY:
1130                 skdev->read_cap_is_valid = 0;
1131                 if (status == SAM_STAT_GOOD) {
1132                         skdev->read_cap_last_lba =
1133                                 (buf[0] << 24) | (buf[1] << 16) |
1134                                 (buf[2] << 8) | buf[3];
1135                         skdev->read_cap_blocksize =
1136                                 (buf[4] << 24) | (buf[5] << 16) |
1137                                 (buf[6] << 8) | buf[7];
1138
1139                         dev_dbg(&skdev->pdev->dev, "last lba %d, bs %d\n",
1140                                 skdev->read_cap_last_lba,
1141                                 skdev->read_cap_blocksize);
1142
1143                         set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1144
1145                         skdev->read_cap_is_valid = 1;
1146
1147                         skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1148                 } else if ((status == SAM_STAT_CHECK_CONDITION) &&
1149                            (skerr->key == MEDIUM_ERROR)) {
1150                         skdev->read_cap_last_lba = ~0;
1151                         set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1152                         dev_dbg(&skdev->pdev->dev, "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
1153                         skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1154                 } else {
1155                         dev_dbg(&skdev->pdev->dev, "**** READCAP failed, retry TUR\n");
1156                         skd_send_internal_skspcl(skdev, skspcl,
1157                                                  TEST_UNIT_READY);
1158                 }
1159                 break;
1160
1161         case INQUIRY:
1162                 skdev->inquiry_is_valid = 0;
1163                 if (status == SAM_STAT_GOOD) {
1164                         skdev->inquiry_is_valid = 1;
1165
1166                         for (i = 0; i < 12; i++)
1167                                 skdev->inq_serial_num[i] = buf[i + 4];
1168                         skdev->inq_serial_num[12] = 0;
1169                 }
1170
1171                 if (skd_unquiesce_dev(skdev) < 0)
1172                         dev_dbg(&skdev->pdev->dev, "**** failed, to ONLINE device\n");
1173                  /* connection is complete */
1174                 skdev->connect_retries = 0;
1175                 break;
1176
1177         case SYNCHRONIZE_CACHE:
1178                 if (status == SAM_STAT_GOOD)
1179                         skdev->sync_done = 1;
1180                 else
1181                         skdev->sync_done = -1;
1182                 wake_up_interruptible(&skdev->waitq);
1183                 break;
1184
1185         default:
1186                 SKD_ASSERT("we didn't send this");
1187         }
1188 }
1189
1190 /*
1191  *****************************************************************************
1192  * FIT MESSAGES
1193  *****************************************************************************
1194  */
1195
1196 static void skd_send_fitmsg(struct skd_device *skdev,
1197                             struct skd_fitmsg_context *skmsg)
1198 {
1199         u64 qcmd;
1200
1201         dev_dbg(&skdev->pdev->dev, "dma address %pad, busy=%d\n",
1202                 &skmsg->mb_dma_address, skd_in_flight(skdev));
1203         dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf);
1204
1205         qcmd = skmsg->mb_dma_address;
1206         qcmd |= FIT_QCMD_QID_NORMAL;
1207
1208         if (unlikely(skdev->dbg_level > 1)) {
1209                 u8 *bp = (u8 *)skmsg->msg_buf;
1210                 int i;
1211                 for (i = 0; i < skmsg->length; i += 8) {
1212                         dev_dbg(&skdev->pdev->dev, "msg[%2d] %8ph\n", i,
1213                                 &bp[i]);
1214                         if (i == 0)
1215                                 i = 64 - 8;
1216                 }
1217         }
1218
1219         if (skmsg->length > 256)
1220                 qcmd |= FIT_QCMD_MSGSIZE_512;
1221         else if (skmsg->length > 128)
1222                 qcmd |= FIT_QCMD_MSGSIZE_256;
1223         else if (skmsg->length > 64)
1224                 qcmd |= FIT_QCMD_MSGSIZE_128;
1225         else
1226                 /*
1227                  * This makes no sense because the FIT msg header is
1228                  * 64 bytes. If the msg is only 64 bytes long it has
1229                  * no payload.
1230                  */
1231                 qcmd |= FIT_QCMD_MSGSIZE_64;
1232
1233         dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address,
1234                                    skmsg->length, DMA_TO_DEVICE);
1235
1236         /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1237         smp_wmb();
1238
1239         SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1240 }
1241
1242 static void skd_send_special_fitmsg(struct skd_device *skdev,
1243                                     struct skd_special_context *skspcl)
1244 {
1245         u64 qcmd;
1246
1247         WARN_ON_ONCE(skspcl->req.n_sg != 1);
1248
1249         if (unlikely(skdev->dbg_level > 1)) {
1250                 u8 *bp = (u8 *)skspcl->msg_buf;
1251                 int i;
1252
1253                 for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
1254                         dev_dbg(&skdev->pdev->dev, " spcl[%2d] %8ph\n", i,
1255                                 &bp[i]);
1256                         if (i == 0)
1257                                 i = 64 - 8;
1258                 }
1259
1260                 dev_dbg(&skdev->pdev->dev,
1261                         "skspcl=%p id=%04x sksg_list=%p sksg_dma=%pad\n",
1262                         skspcl, skspcl->req.id, skspcl->req.sksg_list,
1263                         &skspcl->req.sksg_dma_address);
1264                 for (i = 0; i < skspcl->req.n_sg; i++) {
1265                         struct fit_sg_descriptor *sgd =
1266                                 &skspcl->req.sksg_list[i];
1267
1268                         dev_dbg(&skdev->pdev->dev,
1269                                 "  sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
1270                                 i, sgd->byte_count, sgd->control,
1271                                 sgd->host_side_addr, sgd->next_desc_ptr);
1272                 }
1273         }
1274
1275         /*
1276          * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
1277          * and one 64-byte SSDI command.
1278          */
1279         qcmd = skspcl->mb_dma_address;
1280         qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
1281
1282         dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address,
1283                                    SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE);
1284         dma_sync_single_for_device(&skdev->pdev->dev,
1285                                    skspcl->req.sksg_dma_address,
1286                                    1 * sizeof(struct fit_sg_descriptor),
1287                                    DMA_TO_DEVICE);
1288         dma_sync_single_for_device(&skdev->pdev->dev,
1289                                    skspcl->db_dma_address,
1290                                    skspcl->req.sksg_list[0].byte_count,
1291                                    DMA_BIDIRECTIONAL);
1292
1293         /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1294         smp_wmb();
1295
1296         SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1297 }
1298
1299 /*
1300  *****************************************************************************
1301  * COMPLETION QUEUE
1302  *****************************************************************************
1303  */
1304
1305 static void skd_complete_other(struct skd_device *skdev,
1306                                struct fit_completion_entry_v1 *skcomp,
1307                                struct fit_comp_error_info *skerr);
1308
1309 struct sns_info {
1310         u8 type;
1311         u8 stat;
1312         u8 key;
1313         u8 asc;
1314         u8 ascq;
1315         u8 mask;
1316         enum skd_check_status_action action;
1317 };
1318
1319 static struct sns_info skd_chkstat_table[] = {
1320         /* Good */
1321         { 0x70, 0x02, RECOVERED_ERROR, 0,    0,    0x1c,
1322           SKD_CHECK_STATUS_REPORT_GOOD },
1323
1324         /* Smart alerts */
1325         { 0x70, 0x02, NO_SENSE,        0x0B, 0x00, 0x1E,        /* warnings */
1326           SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1327         { 0x70, 0x02, NO_SENSE,        0x5D, 0x00, 0x1E,        /* thresholds */
1328           SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1329         { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F,        /* temperature over trigger */
1330           SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1331
1332         /* Retry (with limits) */
1333         { 0x70, 0x02, 0x0B,            0,    0,    0x1C,        /* This one is for DMA ERROR */
1334           SKD_CHECK_STATUS_REQUEUE_REQUEST },
1335         { 0x70, 0x02, 0x06,            0x0B, 0x00, 0x1E,        /* warnings */
1336           SKD_CHECK_STATUS_REQUEUE_REQUEST },
1337         { 0x70, 0x02, 0x06,            0x5D, 0x00, 0x1E,        /* thresholds */
1338           SKD_CHECK_STATUS_REQUEUE_REQUEST },
1339         { 0x70, 0x02, 0x06,            0x80, 0x30, 0x1F,        /* backup power */
1340           SKD_CHECK_STATUS_REQUEUE_REQUEST },
1341
1342         /* Busy (or about to be) */
1343         { 0x70, 0x02, 0x06,            0x3f, 0x01, 0x1F, /* fw changed */
1344           SKD_CHECK_STATUS_BUSY_IMMINENT },
1345 };
1346
1347 /*
1348  * Look up status and sense data to decide how to handle the error
1349  * from the device.
1350  * mask says which fields must match e.g., mask=0x18 means check
1351  * type and stat, ignore key, asc, ascq.
1352  */
1353
1354 static enum skd_check_status_action
1355 skd_check_status(struct skd_device *skdev,
1356                  u8 cmp_status, struct fit_comp_error_info *skerr)
1357 {
1358         int i;
1359
1360         dev_err(&skdev->pdev->dev, "key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1361                 skerr->key, skerr->code, skerr->qual, skerr->fruc);
1362
1363         dev_dbg(&skdev->pdev->dev,
1364                 "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n",
1365                 skerr->type, cmp_status, skerr->key, skerr->code, skerr->qual,
1366                 skerr->fruc);
1367
1368         /* Does the info match an entry in the good category? */
1369         for (i = 0; i < ARRAY_SIZE(skd_chkstat_table); i++) {
1370                 struct sns_info *sns = &skd_chkstat_table[i];
1371
1372                 if (sns->mask & 0x10)
1373                         if (skerr->type != sns->type)
1374                                 continue;
1375
1376                 if (sns->mask & 0x08)
1377                         if (cmp_status != sns->stat)
1378                                 continue;
1379
1380                 if (sns->mask & 0x04)
1381                         if (skerr->key != sns->key)
1382                                 continue;
1383
1384                 if (sns->mask & 0x02)
1385                         if (skerr->code != sns->asc)
1386                                 continue;
1387
1388                 if (sns->mask & 0x01)
1389                         if (skerr->qual != sns->ascq)
1390                                 continue;
1391
1392                 if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
1393                         dev_err(&skdev->pdev->dev,
1394                                 "SMART Alert: sense key/asc/ascq %02x/%02x/%02x\n",
1395                                 skerr->key, skerr->code, skerr->qual);
1396                 }
1397                 return sns->action;
1398         }
1399
1400         /* No other match, so nonzero status means error,
1401          * zero status means good
1402          */
1403         if (cmp_status) {
1404                 dev_dbg(&skdev->pdev->dev, "status check: error\n");
1405                 return SKD_CHECK_STATUS_REPORT_ERROR;
1406         }
1407
1408         dev_dbg(&skdev->pdev->dev, "status check good default\n");
1409         return SKD_CHECK_STATUS_REPORT_GOOD;
1410 }
1411
1412 static void skd_resolve_req_exception(struct skd_device *skdev,
1413                                       struct skd_request_context *skreq,
1414                                       struct request *req)
1415 {
1416         u8 cmp_status = skreq->completion.status;
1417
1418         switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
1419         case SKD_CHECK_STATUS_REPORT_GOOD:
1420         case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
1421                 skreq->status = BLK_STS_OK;
1422                 blk_mq_complete_request(req);
1423                 break;
1424
1425         case SKD_CHECK_STATUS_BUSY_IMMINENT:
1426                 skd_log_skreq(skdev, skreq, "retry(busy)");
1427                 blk_mq_requeue_request(req, true);
1428                 dev_info(&skdev->pdev->dev, "drive BUSY imminent\n");
1429                 skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
1430                 skdev->timer_countdown = SKD_TIMER_MINUTES(20);
1431                 skd_quiesce_dev(skdev);
1432                 break;
1433
1434         case SKD_CHECK_STATUS_REQUEUE_REQUEST:
1435                 if (++skreq->retries < SKD_MAX_RETRIES) {
1436                         skd_log_skreq(skdev, skreq, "retry");
1437                         blk_mq_requeue_request(req, true);
1438                         break;
1439                 }
1440                 /* fall through */
1441
1442         case SKD_CHECK_STATUS_REPORT_ERROR:
1443         default:
1444                 skreq->status = BLK_STS_IOERR;
1445                 blk_mq_complete_request(req);
1446                 break;
1447         }
1448 }
1449
1450 static void skd_release_skreq(struct skd_device *skdev,
1451                               struct skd_request_context *skreq)
1452 {
1453         /*
1454          * Reclaim the skd_request_context
1455          */
1456         skreq->state = SKD_REQ_STATE_IDLE;
1457 }
1458
1459 static int skd_isr_completion_posted(struct skd_device *skdev,
1460                                         int limit, int *enqueued)
1461 {
1462         struct fit_completion_entry_v1 *skcmp;
1463         struct fit_comp_error_info *skerr;
1464         u16 req_id;
1465         u32 tag;
1466         u16 hwq = 0;
1467         struct request *rq;
1468         struct skd_request_context *skreq;
1469         u16 cmp_cntxt;
1470         u8 cmp_status;
1471         u8 cmp_cycle;
1472         u32 cmp_bytes;
1473         int rc = 0;
1474         int processed = 0;
1475
1476         lockdep_assert_held(&skdev->lock);
1477
1478         for (;; ) {
1479                 SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
1480
1481                 skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
1482                 cmp_cycle = skcmp->cycle;
1483                 cmp_cntxt = skcmp->tag;
1484                 cmp_status = skcmp->status;
1485                 cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
1486
1487                 skerr = &skdev->skerr_table[skdev->skcomp_ix];
1488
1489                 dev_dbg(&skdev->pdev->dev,
1490                         "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n",
1491                         skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle,
1492                         cmp_cntxt, cmp_status, skd_in_flight(skdev),
1493                         cmp_bytes, skdev->proto_ver);
1494
1495                 if (cmp_cycle != skdev->skcomp_cycle) {
1496                         dev_dbg(&skdev->pdev->dev, "end of completions\n");
1497                         break;
1498                 }
1499                 /*
1500                  * Update the completion queue head index and possibly
1501                  * the completion cycle count. 8-bit wrap-around.
1502                  */
1503                 skdev->skcomp_ix++;
1504                 if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
1505                         skdev->skcomp_ix = 0;
1506                         skdev->skcomp_cycle++;
1507                 }
1508
1509                 /*
1510                  * The command context is a unique 32-bit ID. The low order
1511                  * bits help locate the request. The request is usually a
1512                  * r/w request (see skd_start() above) or a special request.
1513                  */
1514                 req_id = cmp_cntxt;
1515                 tag = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
1516
1517                 /* Is this other than a r/w request? */
1518                 if (tag >= skdev->num_req_context) {
1519                         /*
1520                          * This is not a completion for a r/w request.
1521                          */
1522                         WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq],
1523                                                       tag));
1524                         skd_complete_other(skdev, skcmp, skerr);
1525                         continue;
1526                 }
1527
1528                 rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag);
1529                 if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt,
1530                          tag))
1531                         continue;
1532                 skreq = blk_mq_rq_to_pdu(rq);
1533
1534                 /*
1535                  * Make sure the request ID for the slot matches.
1536                  */
1537                 if (skreq->id != req_id) {
1538                         dev_err(&skdev->pdev->dev,
1539                                 "Completion mismatch comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
1540                                 req_id, skreq->id, cmp_cntxt);
1541
1542                         continue;
1543                 }
1544
1545                 SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
1546
1547                 skreq->completion = *skcmp;
1548                 if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
1549                         skreq->err_info = *skerr;
1550                         skd_log_check_status(skdev, cmp_status, skerr->key,
1551                                              skerr->code, skerr->qual,
1552                                              skerr->fruc);
1553                 }
1554                 /* Release DMA resources for the request. */
1555                 if (skreq->n_sg > 0)
1556                         skd_postop_sg_list(skdev, skreq);
1557
1558                 skd_release_skreq(skdev, skreq);
1559
1560                 /*
1561                  * Capture the outcome and post it back to the native request.
1562                  */
1563                 if (likely(cmp_status == SAM_STAT_GOOD)) {
1564                         skreq->status = BLK_STS_OK;
1565                         blk_mq_complete_request(rq);
1566                 } else {
1567                         skd_resolve_req_exception(skdev, skreq, rq);
1568                 }
1569
1570                 /* skd_isr_comp_limit equal zero means no limit */
1571                 if (limit) {
1572                         if (++processed >= limit) {
1573                                 rc = 1;
1574                                 break;
1575                         }
1576                 }
1577         }
1578
1579         if (skdev->state == SKD_DRVR_STATE_PAUSING &&
1580             skd_in_flight(skdev) == 0) {
1581                 skdev->state = SKD_DRVR_STATE_PAUSED;
1582                 wake_up_interruptible(&skdev->waitq);
1583         }
1584
1585         return rc;
1586 }
1587
1588 static void skd_complete_other(struct skd_device *skdev,
1589                                struct fit_completion_entry_v1 *skcomp,
1590                                struct fit_comp_error_info *skerr)
1591 {
1592         u32 req_id = 0;
1593         u32 req_table;
1594         u32 req_slot;
1595         struct skd_special_context *skspcl;
1596
1597         lockdep_assert_held(&skdev->lock);
1598
1599         req_id = skcomp->tag;
1600         req_table = req_id & SKD_ID_TABLE_MASK;
1601         req_slot = req_id & SKD_ID_SLOT_MASK;
1602
1603         dev_dbg(&skdev->pdev->dev, "table=0x%x id=0x%x slot=%d\n", req_table,
1604                 req_id, req_slot);
1605
1606         /*
1607          * Based on the request id, determine how to dispatch this completion.
1608          * This swich/case is finding the good cases and forwarding the
1609          * completion entry. Errors are reported below the switch.
1610          */
1611         switch (req_table) {
1612         case SKD_ID_RW_REQUEST:
1613                 /*
1614                  * The caller, skd_isr_completion_posted() above,
1615                  * handles r/w requests. The only way we get here
1616                  * is if the req_slot is out of bounds.
1617                  */
1618                 break;
1619
1620         case SKD_ID_INTERNAL:
1621                 if (req_slot == 0) {
1622                         skspcl = &skdev->internal_skspcl;
1623                         if (skspcl->req.id == req_id &&
1624                             skspcl->req.state == SKD_REQ_STATE_BUSY) {
1625                                 skd_complete_internal(skdev,
1626                                                       skcomp, skerr, skspcl);
1627                                 return;
1628                         }
1629                 }
1630                 break;
1631
1632         case SKD_ID_FIT_MSG:
1633                 /*
1634                  * These id's should never appear in a completion record.
1635                  */
1636                 break;
1637
1638         default:
1639                 /*
1640                  * These id's should never appear anywhere;
1641                  */
1642                 break;
1643         }
1644
1645         /*
1646          * If we get here it is a bad or stale id.
1647          */
1648 }
1649
1650 static void skd_reset_skcomp(struct skd_device *skdev)
1651 {
1652         memset(skdev->skcomp_table, 0, SKD_SKCOMP_SIZE);
1653
1654         skdev->skcomp_ix = 0;
1655         skdev->skcomp_cycle = 1;
1656 }
1657
1658 /*
1659  *****************************************************************************
1660  * INTERRUPTS
1661  *****************************************************************************
1662  */
1663 static void skd_completion_worker(struct work_struct *work)
1664 {
1665         struct skd_device *skdev =
1666                 container_of(work, struct skd_device, completion_worker);
1667         unsigned long flags;
1668         int flush_enqueued = 0;
1669
1670         spin_lock_irqsave(&skdev->lock, flags);
1671
1672         /*
1673          * pass in limit=0, which means no limit..
1674          * process everything in compq
1675          */
1676         skd_isr_completion_posted(skdev, 0, &flush_enqueued);
1677         schedule_work(&skdev->start_queue);
1678
1679         spin_unlock_irqrestore(&skdev->lock, flags);
1680 }
1681
1682 static void skd_isr_msg_from_dev(struct skd_device *skdev);
1683
1684 static irqreturn_t
1685 skd_isr(int irq, void *ptr)
1686 {
1687         struct skd_device *skdev = ptr;
1688         u32 intstat;
1689         u32 ack;
1690         int rc = 0;
1691         int deferred = 0;
1692         int flush_enqueued = 0;
1693
1694         spin_lock(&skdev->lock);
1695
1696         for (;; ) {
1697                 intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
1698
1699                 ack = FIT_INT_DEF_MASK;
1700                 ack &= intstat;
1701
1702                 dev_dbg(&skdev->pdev->dev, "intstat=0x%x ack=0x%x\n", intstat,
1703                         ack);
1704
1705                 /* As long as there is an int pending on device, keep
1706                  * running loop.  When none, get out, but if we've never
1707                  * done any processing, call completion handler?
1708                  */
1709                 if (ack == 0) {
1710                         /* No interrupts on device, but run the completion
1711                          * processor anyway?
1712                          */
1713                         if (rc == 0)
1714                                 if (likely (skdev->state
1715                                         == SKD_DRVR_STATE_ONLINE))
1716                                         deferred = 1;
1717                         break;
1718                 }
1719
1720                 rc = IRQ_HANDLED;
1721
1722                 SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
1723
1724                 if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
1725                            (skdev->state != SKD_DRVR_STATE_STOPPING))) {
1726                         if (intstat & FIT_ISH_COMPLETION_POSTED) {
1727                                 /*
1728                                  * If we have already deferred completion
1729                                  * processing, don't bother running it again
1730                                  */
1731                                 if (deferred == 0)
1732                                         deferred =
1733                                                 skd_isr_completion_posted(skdev,
1734                                                 skd_isr_comp_limit, &flush_enqueued);
1735                         }
1736
1737                         if (intstat & FIT_ISH_FW_STATE_CHANGE) {
1738                                 skd_isr_fwstate(skdev);
1739                                 if (skdev->state == SKD_DRVR_STATE_FAULT ||
1740                                     skdev->state ==
1741                                     SKD_DRVR_STATE_DISAPPEARED) {
1742                                         spin_unlock(&skdev->lock);
1743                                         return rc;
1744                                 }
1745                         }
1746
1747                         if (intstat & FIT_ISH_MSG_FROM_DEV)
1748                                 skd_isr_msg_from_dev(skdev);
1749                 }
1750         }
1751
1752         if (unlikely(flush_enqueued))
1753                 schedule_work(&skdev->start_queue);
1754
1755         if (deferred)
1756                 schedule_work(&skdev->completion_worker);
1757         else if (!flush_enqueued)
1758                 schedule_work(&skdev->start_queue);
1759
1760         spin_unlock(&skdev->lock);
1761
1762         return rc;
1763 }
1764
1765 static void skd_drive_fault(struct skd_device *skdev)
1766 {
1767         skdev->state = SKD_DRVR_STATE_FAULT;
1768         dev_err(&skdev->pdev->dev, "Drive FAULT\n");
1769 }
1770
1771 static void skd_drive_disappeared(struct skd_device *skdev)
1772 {
1773         skdev->state = SKD_DRVR_STATE_DISAPPEARED;
1774         dev_err(&skdev->pdev->dev, "Drive DISAPPEARED\n");
1775 }
1776
1777 static void skd_isr_fwstate(struct skd_device *skdev)
1778 {
1779         u32 sense;
1780         u32 state;
1781         u32 mtd;
1782         int prev_driver_state = skdev->state;
1783
1784         sense = SKD_READL(skdev, FIT_STATUS);
1785         state = sense & FIT_SR_DRIVE_STATE_MASK;
1786
1787         dev_err(&skdev->pdev->dev, "s1120 state %s(%d)=>%s(%d)\n",
1788                 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
1789                 skd_drive_state_to_str(state), state);
1790
1791         skdev->drive_state = state;
1792
1793         switch (skdev->drive_state) {
1794         case FIT_SR_DRIVE_INIT:
1795                 if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
1796                         skd_disable_interrupts(skdev);
1797                         break;
1798                 }
1799                 if (skdev->state == SKD_DRVR_STATE_RESTARTING)
1800                         skd_recover_requests(skdev);
1801                 if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
1802                         skdev->timer_countdown = SKD_STARTING_TIMO;
1803                         skdev->state = SKD_DRVR_STATE_STARTING;
1804                         skd_soft_reset(skdev);
1805                         break;
1806                 }
1807                 mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
1808                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1809                 skdev->last_mtd = mtd;
1810                 break;
1811
1812         case FIT_SR_DRIVE_ONLINE:
1813                 skdev->cur_max_queue_depth = skd_max_queue_depth;
1814                 if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
1815                         skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
1816
1817                 skdev->queue_low_water_mark =
1818                         skdev->cur_max_queue_depth * 2 / 3 + 1;
1819                 if (skdev->queue_low_water_mark < 1)
1820                         skdev->queue_low_water_mark = 1;
1821                 dev_info(&skdev->pdev->dev,
1822                          "Queue depth limit=%d dev=%d lowat=%d\n",
1823                          skdev->cur_max_queue_depth,
1824                          skdev->dev_max_queue_depth,
1825                          skdev->queue_low_water_mark);
1826
1827                 skd_refresh_device_data(skdev);
1828                 break;
1829
1830         case FIT_SR_DRIVE_BUSY:
1831                 skdev->state = SKD_DRVR_STATE_BUSY;
1832                 skdev->timer_countdown = SKD_BUSY_TIMO;
1833                 skd_quiesce_dev(skdev);
1834                 break;
1835         case FIT_SR_DRIVE_BUSY_SANITIZE:
1836                 /* set timer for 3 seconds, we'll abort any unfinished
1837                  * commands after that expires
1838                  */
1839                 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
1840                 skdev->timer_countdown = SKD_TIMER_SECONDS(3);
1841                 schedule_work(&skdev->start_queue);
1842                 break;
1843         case FIT_SR_DRIVE_BUSY_ERASE:
1844                 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
1845                 skdev->timer_countdown = SKD_BUSY_TIMO;
1846                 break;
1847         case FIT_SR_DRIVE_OFFLINE:
1848                 skdev->state = SKD_DRVR_STATE_IDLE;
1849                 break;
1850         case FIT_SR_DRIVE_SOFT_RESET:
1851                 switch (skdev->state) {
1852                 case SKD_DRVR_STATE_STARTING:
1853                 case SKD_DRVR_STATE_RESTARTING:
1854                         /* Expected by a caller of skd_soft_reset() */
1855                         break;
1856                 default:
1857                         skdev->state = SKD_DRVR_STATE_RESTARTING;
1858                         break;
1859                 }
1860                 break;
1861         case FIT_SR_DRIVE_FW_BOOTING:
1862                 dev_dbg(&skdev->pdev->dev, "ISR FIT_SR_DRIVE_FW_BOOTING\n");
1863                 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
1864                 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
1865                 break;
1866
1867         case FIT_SR_DRIVE_DEGRADED:
1868         case FIT_SR_PCIE_LINK_DOWN:
1869         case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
1870                 break;
1871
1872         case FIT_SR_DRIVE_FAULT:
1873                 skd_drive_fault(skdev);
1874                 skd_recover_requests(skdev);
1875                 schedule_work(&skdev->start_queue);
1876                 break;
1877
1878         /* PCIe bus returned all Fs? */
1879         case 0xFF:
1880                 dev_info(&skdev->pdev->dev, "state=0x%x sense=0x%x\n", state,
1881                          sense);
1882                 skd_drive_disappeared(skdev);
1883                 skd_recover_requests(skdev);
1884                 schedule_work(&skdev->start_queue);
1885                 break;
1886         default:
1887                 /*
1888                  * Uknown FW State. Wait for a state we recognize.
1889                  */
1890                 break;
1891         }
1892         dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
1893                 skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
1894                 skd_skdev_state_to_str(skdev->state), skdev->state);
1895 }
1896
1897 static bool skd_recover_request(struct request *req, void *data, bool reserved)
1898 {
1899         struct skd_device *const skdev = data;
1900         struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
1901
1902         if (skreq->state != SKD_REQ_STATE_BUSY)
1903                 return true;
1904
1905         skd_log_skreq(skdev, skreq, "recover");
1906
1907         /* Release DMA resources for the request. */
1908         if (skreq->n_sg > 0)
1909                 skd_postop_sg_list(skdev, skreq);
1910
1911         skreq->state = SKD_REQ_STATE_IDLE;
1912         skreq->status = BLK_STS_IOERR;
1913         blk_mq_complete_request(req);
1914         return true;
1915 }
1916
1917 static void skd_recover_requests(struct skd_device *skdev)
1918 {
1919         blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev);
1920 }
1921
1922 static void skd_isr_msg_from_dev(struct skd_device *skdev)
1923 {
1924         u32 mfd;
1925         u32 mtd;
1926         u32 data;
1927
1928         mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
1929
1930         dev_dbg(&skdev->pdev->dev, "mfd=0x%x last_mtd=0x%x\n", mfd,
1931                 skdev->last_mtd);
1932
1933         /* ignore any mtd that is an ack for something we didn't send */
1934         if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
1935                 return;
1936
1937         switch (FIT_MXD_TYPE(mfd)) {
1938         case FIT_MTD_FITFW_INIT:
1939                 skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
1940
1941                 if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
1942                         dev_err(&skdev->pdev->dev, "protocol mismatch\n");
1943                         dev_err(&skdev->pdev->dev, "  got=%d support=%d\n",
1944                                 skdev->proto_ver, FIT_PROTOCOL_VERSION_1);
1945                         dev_err(&skdev->pdev->dev, "  please upgrade driver\n");
1946                         skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
1947                         skd_soft_reset(skdev);
1948                         break;
1949                 }
1950                 mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
1951                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1952                 skdev->last_mtd = mtd;
1953                 break;
1954
1955         case FIT_MTD_GET_CMDQ_DEPTH:
1956                 skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
1957                 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
1958                                    SKD_N_COMPLETION_ENTRY);
1959                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1960                 skdev->last_mtd = mtd;
1961                 break;
1962
1963         case FIT_MTD_SET_COMPQ_DEPTH:
1964                 SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
1965                 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
1966                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1967                 skdev->last_mtd = mtd;
1968                 break;
1969
1970         case FIT_MTD_SET_COMPQ_ADDR:
1971                 skd_reset_skcomp(skdev);
1972                 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
1973                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1974                 skdev->last_mtd = mtd;
1975                 break;
1976
1977         case FIT_MTD_CMD_LOG_HOST_ID:
1978                 /* hardware interface overflows in y2106 */
1979                 skdev->connect_time_stamp = (u32)ktime_get_real_seconds();
1980                 data = skdev->connect_time_stamp & 0xFFFF;
1981                 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
1982                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1983                 skdev->last_mtd = mtd;
1984                 break;
1985
1986         case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
1987                 skdev->drive_jiffies = FIT_MXD_DATA(mfd);
1988                 data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
1989                 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
1990                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1991                 skdev->last_mtd = mtd;
1992                 break;
1993
1994         case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
1995                 skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
1996                 mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
1997                 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1998                 skdev->last_mtd = mtd;
1999
2000                 dev_err(&skdev->pdev->dev, "Time sync driver=0x%x device=0x%x\n",
2001                         skdev->connect_time_stamp, skdev->drive_jiffies);
2002                 break;
2003
2004         case FIT_MTD_ARM_QUEUE:
2005                 skdev->last_mtd = 0;
2006                 /*
2007                  * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
2008                  */
2009                 break;
2010
2011         default:
2012                 break;
2013         }
2014 }
2015
2016 static void skd_disable_interrupts(struct skd_device *skdev)
2017 {
2018         u32 sense;
2019
2020         sense = SKD_READL(skdev, FIT_CONTROL);
2021         sense &= ~FIT_CR_ENABLE_INTERRUPTS;
2022         SKD_WRITEL(skdev, sense, FIT_CONTROL);
2023         dev_dbg(&skdev->pdev->dev, "sense 0x%x\n", sense);
2024
2025         /* Note that the 1s is written. A 1-bit means
2026          * disable, a 0 means enable.
2027          */
2028         SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
2029 }
2030
2031 static void skd_enable_interrupts(struct skd_device *skdev)
2032 {
2033         u32 val;
2034
2035         /* unmask interrupts first */
2036         val = FIT_ISH_FW_STATE_CHANGE +
2037               FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
2038
2039         /* Note that the compliment of mask is written. A 1-bit means
2040          * disable, a 0 means enable. */
2041         SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
2042         dev_dbg(&skdev->pdev->dev, "interrupt mask=0x%x\n", ~val);
2043
2044         val = SKD_READL(skdev, FIT_CONTROL);
2045         val |= FIT_CR_ENABLE_INTERRUPTS;
2046         dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2047         SKD_WRITEL(skdev, val, FIT_CONTROL);
2048 }
2049
2050 /*
2051  *****************************************************************************
2052  * START, STOP, RESTART, QUIESCE, UNQUIESCE
2053  *****************************************************************************
2054  */
2055
2056 static void skd_soft_reset(struct skd_device *skdev)
2057 {
2058         u32 val;
2059
2060         val = SKD_READL(skdev, FIT_CONTROL);
2061         val |= (FIT_CR_SOFT_RESET);
2062         dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2063         SKD_WRITEL(skdev, val, FIT_CONTROL);
2064 }
2065
2066 static void skd_start_device(struct skd_device *skdev)
2067 {
2068         unsigned long flags;
2069         u32 sense;
2070         u32 state;
2071
2072         spin_lock_irqsave(&skdev->lock, flags);
2073
2074         /* ack all ghost interrupts */
2075         SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2076
2077         sense = SKD_READL(skdev, FIT_STATUS);
2078
2079         dev_dbg(&skdev->pdev->dev, "initial status=0x%x\n", sense);
2080
2081         state = sense & FIT_SR_DRIVE_STATE_MASK;
2082         skdev->drive_state = state;
2083         skdev->last_mtd = 0;
2084
2085         skdev->state = SKD_DRVR_STATE_STARTING;
2086         skdev->timer_countdown = SKD_STARTING_TIMO;
2087
2088         skd_enable_interrupts(skdev);
2089
2090         switch (skdev->drive_state) {
2091         case FIT_SR_DRIVE_OFFLINE:
2092                 dev_err(&skdev->pdev->dev, "Drive offline...\n");
2093                 break;
2094
2095         case FIT_SR_DRIVE_FW_BOOTING:
2096                 dev_dbg(&skdev->pdev->dev, "FIT_SR_DRIVE_FW_BOOTING\n");
2097                 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
2098                 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
2099                 break;
2100
2101         case FIT_SR_DRIVE_BUSY_SANITIZE:
2102                 dev_info(&skdev->pdev->dev, "Start: BUSY_SANITIZE\n");
2103                 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
2104                 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2105                 break;
2106
2107         case FIT_SR_DRIVE_BUSY_ERASE:
2108                 dev_info(&skdev->pdev->dev, "Start: BUSY_ERASE\n");
2109                 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
2110                 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2111                 break;
2112
2113         case FIT_SR_DRIVE_INIT:
2114         case FIT_SR_DRIVE_ONLINE:
2115                 skd_soft_reset(skdev);
2116                 break;
2117
2118         case FIT_SR_DRIVE_BUSY:
2119                 dev_err(&skdev->pdev->dev, "Drive Busy...\n");
2120                 skdev->state = SKD_DRVR_STATE_BUSY;
2121                 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2122                 break;
2123
2124         case FIT_SR_DRIVE_SOFT_RESET:
2125                 dev_err(&skdev->pdev->dev, "drive soft reset in prog\n");
2126                 break;
2127
2128         case FIT_SR_DRIVE_FAULT:
2129                 /* Fault state is bad...soft reset won't do it...
2130                  * Hard reset, maybe, but does it work on device?
2131                  * For now, just fault so the system doesn't hang.
2132                  */
2133                 skd_drive_fault(skdev);
2134                 /*start the queue so we can respond with error to requests */
2135                 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2136                 schedule_work(&skdev->start_queue);
2137                 skdev->gendisk_on = -1;
2138                 wake_up_interruptible(&skdev->waitq);
2139                 break;
2140
2141         case 0xFF:
2142                 /* Most likely the device isn't there or isn't responding
2143                  * to the BAR1 addresses. */
2144                 skd_drive_disappeared(skdev);
2145                 /*start the queue so we can respond with error to requests */
2146                 dev_dbg(&skdev->pdev->dev,
2147                         "starting queue to error-out reqs\n");
2148                 schedule_work(&skdev->start_queue);
2149                 skdev->gendisk_on = -1;
2150                 wake_up_interruptible(&skdev->waitq);
2151                 break;
2152
2153         default:
2154                 dev_err(&skdev->pdev->dev, "Start: unknown state %x\n",
2155                         skdev->drive_state);
2156                 break;
2157         }
2158
2159         state = SKD_READL(skdev, FIT_CONTROL);
2160         dev_dbg(&skdev->pdev->dev, "FIT Control Status=0x%x\n", state);
2161
2162         state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
2163         dev_dbg(&skdev->pdev->dev, "Intr Status=0x%x\n", state);
2164
2165         state = SKD_READL(skdev, FIT_INT_MASK_HOST);
2166         dev_dbg(&skdev->pdev->dev, "Intr Mask=0x%x\n", state);
2167
2168         state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
2169         dev_dbg(&skdev->pdev->dev, "Msg from Dev=0x%x\n", state);
2170
2171         state = SKD_READL(skdev, FIT_HW_VERSION);
2172         dev_dbg(&skdev->pdev->dev, "HW version=0x%x\n", state);
2173
2174         spin_unlock_irqrestore(&skdev->lock, flags);
2175 }
2176
2177 static void skd_stop_device(struct skd_device *skdev)
2178 {
2179         unsigned long flags;
2180         struct skd_special_context *skspcl = &skdev->internal_skspcl;
2181         u32 dev_state;
2182         int i;
2183
2184         spin_lock_irqsave(&skdev->lock, flags);
2185
2186         if (skdev->state != SKD_DRVR_STATE_ONLINE) {
2187                 dev_err(&skdev->pdev->dev, "%s not online no sync\n", __func__);
2188                 goto stop_out;
2189         }
2190
2191         if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
2192                 dev_err(&skdev->pdev->dev, "%s no special\n", __func__);
2193                 goto stop_out;
2194         }
2195
2196         skdev->state = SKD_DRVR_STATE_SYNCING;
2197         skdev->sync_done = 0;
2198
2199         skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
2200
2201         spin_unlock_irqrestore(&skdev->lock, flags);
2202
2203         wait_event_interruptible_timeout(skdev->waitq,
2204                                          (skdev->sync_done), (10 * HZ));
2205
2206         spin_lock_irqsave(&skdev->lock, flags);
2207
2208         switch (skdev->sync_done) {
2209         case 0:
2210                 dev_err(&skdev->pdev->dev, "%s no sync\n", __func__);
2211                 break;
2212         case 1:
2213                 dev_err(&skdev->pdev->dev, "%s sync done\n", __func__);
2214                 break;
2215         default:
2216                 dev_err(&skdev->pdev->dev, "%s sync error\n", __func__);
2217         }
2218
2219 stop_out:
2220         skdev->state = SKD_DRVR_STATE_STOPPING;
2221         spin_unlock_irqrestore(&skdev->lock, flags);
2222
2223         skd_kill_timer(skdev);
2224
2225         spin_lock_irqsave(&skdev->lock, flags);
2226         skd_disable_interrupts(skdev);
2227
2228         /* ensure all ints on device are cleared */
2229         /* soft reset the device to unload with a clean slate */
2230         SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2231         SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
2232
2233         spin_unlock_irqrestore(&skdev->lock, flags);
2234
2235         /* poll every 100ms, 1 second timeout */
2236         for (i = 0; i < 10; i++) {
2237                 dev_state =
2238                         SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
2239                 if (dev_state == FIT_SR_DRIVE_INIT)
2240                         break;
2241                 set_current_state(TASK_INTERRUPTIBLE);
2242                 schedule_timeout(msecs_to_jiffies(100));
2243         }
2244
2245         if (dev_state != FIT_SR_DRIVE_INIT)
2246                 dev_err(&skdev->pdev->dev, "%s state error 0x%02x\n", __func__,
2247                         dev_state);
2248 }
2249
2250 /* assume spinlock is held */
2251 static void skd_restart_device(struct skd_device *skdev)
2252 {
2253         u32 state;
2254
2255         /* ack all ghost interrupts */
2256         SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2257
2258         state = SKD_READL(skdev, FIT_STATUS);
2259
2260         dev_dbg(&skdev->pdev->dev, "drive status=0x%x\n", state);
2261
2262         state &= FIT_SR_DRIVE_STATE_MASK;
2263         skdev->drive_state = state;
2264         skdev->last_mtd = 0;
2265
2266         skdev->state = SKD_DRVR_STATE_RESTARTING;
2267         skdev->timer_countdown = SKD_RESTARTING_TIMO;
2268
2269         skd_soft_reset(skdev);
2270 }
2271
2272 /* assume spinlock is held */
2273 static int skd_quiesce_dev(struct skd_device *skdev)
2274 {
2275         int rc = 0;
2276
2277         switch (skdev->state) {
2278         case SKD_DRVR_STATE_BUSY:
2279         case SKD_DRVR_STATE_BUSY_IMMINENT:
2280                 dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2281                 blk_mq_stop_hw_queues(skdev->queue);
2282                 break;
2283         case SKD_DRVR_STATE_ONLINE:
2284         case SKD_DRVR_STATE_STOPPING:
2285         case SKD_DRVR_STATE_SYNCING:
2286         case SKD_DRVR_STATE_PAUSING:
2287         case SKD_DRVR_STATE_PAUSED:
2288         case SKD_DRVR_STATE_STARTING:
2289         case SKD_DRVR_STATE_RESTARTING:
2290         case SKD_DRVR_STATE_RESUMING:
2291         default:
2292                 rc = -EINVAL;
2293                 dev_dbg(&skdev->pdev->dev, "state [%d] not implemented\n",
2294                         skdev->state);
2295         }
2296         return rc;
2297 }
2298
2299 /* assume spinlock is held */
2300 static int skd_unquiesce_dev(struct skd_device *skdev)
2301 {
2302         int prev_driver_state = skdev->state;
2303
2304         skd_log_skdev(skdev, "unquiesce");
2305         if (skdev->state == SKD_DRVR_STATE_ONLINE) {
2306                 dev_dbg(&skdev->pdev->dev, "**** device already ONLINE\n");
2307                 return 0;
2308         }
2309         if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
2310                 /*
2311                  * If there has been an state change to other than
2312                  * ONLINE, we will rely on controller state change
2313                  * to come back online and restart the queue.
2314                  * The BUSY state means that driver is ready to
2315                  * continue normal processing but waiting for controller
2316                  * to become available.
2317                  */
2318                 skdev->state = SKD_DRVR_STATE_BUSY;
2319                 dev_dbg(&skdev->pdev->dev, "drive BUSY state\n");
2320                 return 0;
2321         }
2322
2323         /*
2324          * Drive has just come online, driver is either in startup,
2325          * paused performing a task, or bust waiting for hardware.
2326          */
2327         switch (skdev->state) {
2328         case SKD_DRVR_STATE_PAUSED:
2329         case SKD_DRVR_STATE_BUSY:
2330         case SKD_DRVR_STATE_BUSY_IMMINENT:
2331         case SKD_DRVR_STATE_BUSY_ERASE:
2332         case SKD_DRVR_STATE_STARTING:
2333         case SKD_DRVR_STATE_RESTARTING:
2334         case SKD_DRVR_STATE_FAULT:
2335         case SKD_DRVR_STATE_IDLE:
2336         case SKD_DRVR_STATE_LOAD:
2337                 skdev->state = SKD_DRVR_STATE_ONLINE;
2338                 dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
2339                         skd_skdev_state_to_str(prev_driver_state),
2340                         prev_driver_state, skd_skdev_state_to_str(skdev->state),
2341                         skdev->state);
2342                 dev_dbg(&skdev->pdev->dev,
2343                         "**** device ONLINE...starting block queue\n");
2344                 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2345                 dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n");
2346                 schedule_work(&skdev->start_queue);
2347                 skdev->gendisk_on = 1;
2348                 wake_up_interruptible(&skdev->waitq);
2349                 break;
2350
2351         case SKD_DRVR_STATE_DISAPPEARED:
2352         default:
2353                 dev_dbg(&skdev->pdev->dev,
2354                         "**** driver state %d, not implemented\n",
2355                         skdev->state);
2356                 return -EBUSY;
2357         }
2358         return 0;
2359 }
2360
2361 /*
2362  *****************************************************************************
2363  * PCIe MSI/MSI-X INTERRUPT HANDLERS
2364  *****************************************************************************
2365  */
2366
2367 static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
2368 {
2369         struct skd_device *skdev = skd_host_data;
2370         unsigned long flags;
2371
2372         spin_lock_irqsave(&skdev->lock, flags);
2373         dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2374                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2375         dev_err(&skdev->pdev->dev, "MSIX reserved irq %d = 0x%x\n", irq,
2376                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2377         SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
2378         spin_unlock_irqrestore(&skdev->lock, flags);
2379         return IRQ_HANDLED;
2380 }
2381
2382 static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
2383 {
2384         struct skd_device *skdev = skd_host_data;
2385         unsigned long flags;
2386
2387         spin_lock_irqsave(&skdev->lock, flags);
2388         dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2389                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2390         SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
2391         skd_isr_fwstate(skdev);
2392         spin_unlock_irqrestore(&skdev->lock, flags);
2393         return IRQ_HANDLED;
2394 }
2395
2396 static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
2397 {
2398         struct skd_device *skdev = skd_host_data;
2399         unsigned long flags;
2400         int flush_enqueued = 0;
2401         int deferred;
2402
2403         spin_lock_irqsave(&skdev->lock, flags);
2404         dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2405                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2406         SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
2407         deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
2408                                                 &flush_enqueued);
2409         if (flush_enqueued)
2410                 schedule_work(&skdev->start_queue);
2411
2412         if (deferred)
2413                 schedule_work(&skdev->completion_worker);
2414         else if (!flush_enqueued)
2415                 schedule_work(&skdev->start_queue);
2416
2417         spin_unlock_irqrestore(&skdev->lock, flags);
2418
2419         return IRQ_HANDLED;
2420 }
2421
2422 static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
2423 {
2424         struct skd_device *skdev = skd_host_data;
2425         unsigned long flags;
2426
2427         spin_lock_irqsave(&skdev->lock, flags);
2428         dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2429                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2430         SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
2431         skd_isr_msg_from_dev(skdev);
2432         spin_unlock_irqrestore(&skdev->lock, flags);
2433         return IRQ_HANDLED;
2434 }
2435
2436 static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
2437 {
2438         struct skd_device *skdev = skd_host_data;
2439         unsigned long flags;
2440
2441         spin_lock_irqsave(&skdev->lock, flags);
2442         dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2443                 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2444         SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
2445         spin_unlock_irqrestore(&skdev->lock, flags);
2446         return IRQ_HANDLED;
2447 }
2448
2449 /*
2450  *****************************************************************************
2451  * PCIe MSI/MSI-X SETUP
2452  *****************************************************************************
2453  */
2454
2455 struct skd_msix_entry {
2456         char isr_name[30];
2457 };
2458
2459 struct skd_init_msix_entry {
2460         const char *name;
2461         irq_handler_t handler;
2462 };
2463
2464 #define SKD_MAX_MSIX_COUNT              13
2465 #define SKD_MIN_MSIX_COUNT              7
2466 #define SKD_BASE_MSIX_IRQ               4
2467
2468 static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
2469         { "(DMA 0)",        skd_reserved_isr },
2470         { "(DMA 1)",        skd_reserved_isr },
2471         { "(DMA 2)",        skd_reserved_isr },
2472         { "(DMA 3)",        skd_reserved_isr },
2473         { "(State Change)", skd_statec_isr   },
2474         { "(COMPL_Q)",      skd_comp_q       },
2475         { "(MSG)",          skd_msg_isr      },
2476         { "(Reserved)",     skd_reserved_isr },
2477         { "(Reserved)",     skd_reserved_isr },
2478         { "(Queue Full 0)", skd_qfull_isr    },
2479         { "(Queue Full 1)", skd_qfull_isr    },
2480         { "(Queue Full 2)", skd_qfull_isr    },
2481         { "(Queue Full 3)", skd_qfull_isr    },
2482 };
2483
2484 static int skd_acquire_msix(struct skd_device *skdev)
2485 {
2486         int i, rc;
2487         struct pci_dev *pdev = skdev->pdev;
2488
2489         rc = pci_alloc_irq_vectors(pdev, SKD_MAX_MSIX_COUNT, SKD_MAX_MSIX_COUNT,
2490                         PCI_IRQ_MSIX);
2491         if (rc < 0) {
2492                 dev_err(&skdev->pdev->dev, "failed to enable MSI-X %d\n", rc);
2493                 goto out;
2494         }
2495
2496         skdev->msix_entries = kcalloc(SKD_MAX_MSIX_COUNT,
2497                         sizeof(struct skd_msix_entry), GFP_KERNEL);
2498         if (!skdev->msix_entries) {
2499                 rc = -ENOMEM;
2500                 dev_err(&skdev->pdev->dev, "msix table allocation error\n");
2501                 goto out;
2502         }
2503
2504         /* Enable MSI-X vectors for the base queue */
2505         for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2506                 struct skd_msix_entry *qentry = &skdev->msix_entries[i];
2507
2508                 snprintf(qentry->isr_name, sizeof(qentry->isr_name),
2509                          "%s%d-msix %s", DRV_NAME, skdev->devno,
2510                          msix_entries[i].name);
2511
2512                 rc = devm_request_irq(&skdev->pdev->dev,
2513                                 pci_irq_vector(skdev->pdev, i),
2514                                 msix_entries[i].handler, 0,
2515                                 qentry->isr_name, skdev);
2516                 if (rc) {
2517                         dev_err(&skdev->pdev->dev,
2518                                 "Unable to register(%d) MSI-X handler %d: %s\n",
2519                                 rc, i, qentry->isr_name);
2520                         goto msix_out;
2521                 }
2522         }
2523
2524         dev_dbg(&skdev->pdev->dev, "%d msix irq(s) enabled\n",
2525                 SKD_MAX_MSIX_COUNT);
2526         return 0;
2527
2528 msix_out:
2529         while (--i >= 0)
2530                 devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), skdev);
2531 out:
2532         kfree(skdev->msix_entries);
2533         skdev->msix_entries = NULL;
2534         return rc;
2535 }
2536
2537 static int skd_acquire_irq(struct skd_device *skdev)
2538 {
2539         struct pci_dev *pdev = skdev->pdev;
2540         unsigned int irq_flag = PCI_IRQ_LEGACY;
2541         int rc;
2542
2543         if (skd_isr_type == SKD_IRQ_MSIX) {
2544                 rc = skd_acquire_msix(skdev);
2545                 if (!rc)
2546                         return 0;
2547
2548                 dev_err(&skdev->pdev->dev,
2549                         "failed to enable MSI-X, re-trying with MSI %d\n", rc);
2550         }
2551
2552         snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d", DRV_NAME,
2553                         skdev->devno);
2554
2555         if (skd_isr_type != SKD_IRQ_LEGACY)
2556                 irq_flag |= PCI_IRQ_MSI;
2557         rc = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag);
2558         if (rc < 0) {
2559                 dev_err(&skdev->pdev->dev,
2560                         "failed to allocate the MSI interrupt %d\n", rc);
2561                 return rc;
2562         }
2563
2564         rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
2565                         pdev->msi_enabled ? 0 : IRQF_SHARED,
2566                         skdev->isr_name, skdev);
2567         if (rc) {
2568                 pci_free_irq_vectors(pdev);
2569                 dev_err(&skdev->pdev->dev, "failed to allocate interrupt %d\n",
2570                         rc);
2571                 return rc;
2572         }
2573
2574         return 0;
2575 }
2576
2577 static void skd_release_irq(struct skd_device *skdev)
2578 {
2579         struct pci_dev *pdev = skdev->pdev;
2580
2581         if (skdev->msix_entries) {
2582                 int i;
2583
2584                 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2585                         devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i),
2586                                         skdev);
2587                 }
2588
2589                 kfree(skdev->msix_entries);
2590                 skdev->msix_entries = NULL;
2591         } else {
2592                 devm_free_irq(&pdev->dev, pdev->irq, skdev);
2593         }
2594
2595         pci_free_irq_vectors(pdev);
2596 }
2597
2598 /*
2599  *****************************************************************************
2600  * CONSTRUCT
2601  *****************************************************************************
2602  */
2603
2604 static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s,
2605                            dma_addr_t *dma_handle, gfp_t gfp,
2606                            enum dma_data_direction dir)
2607 {
2608         struct device *dev = &skdev->pdev->dev;
2609         void *buf;
2610
2611         buf = kmem_cache_alloc(s, gfp);
2612         if (!buf)
2613                 return NULL;
2614         *dma_handle = dma_map_single(dev, buf,
2615                                      kmem_cache_size(s), dir);
2616         if (dma_mapping_error(dev, *dma_handle)) {
2617                 kmem_cache_free(s, buf);
2618                 buf = NULL;
2619         }
2620         return buf;
2621 }
2622
2623 static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s,
2624                          void *vaddr, dma_addr_t dma_handle,
2625                          enum dma_data_direction dir)
2626 {
2627         if (!vaddr)
2628                 return;
2629
2630         dma_unmap_single(&skdev->pdev->dev, dma_handle,
2631                          kmem_cache_size(s), dir);
2632         kmem_cache_free(s, vaddr);
2633 }
2634
2635 static int skd_cons_skcomp(struct skd_device *skdev)
2636 {
2637         int rc = 0;
2638         struct fit_completion_entry_v1 *skcomp;
2639
2640         dev_dbg(&skdev->pdev->dev,
2641                 "comp pci_alloc, total bytes %zd entries %d\n",
2642                 SKD_SKCOMP_SIZE, SKD_N_COMPLETION_ENTRY);
2643
2644         skcomp = dma_alloc_coherent(&skdev->pdev->dev, SKD_SKCOMP_SIZE,
2645                                     &skdev->cq_dma_address, GFP_KERNEL);
2646
2647         if (skcomp == NULL) {
2648                 rc = -ENOMEM;
2649                 goto err_out;
2650         }
2651
2652         skdev->skcomp_table = skcomp;
2653         skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
2654                                                            sizeof(*skcomp) *
2655                                                            SKD_N_COMPLETION_ENTRY);
2656
2657 err_out:
2658         return rc;
2659 }
2660
2661 static int skd_cons_skmsg(struct skd_device *skdev)
2662 {
2663         int rc = 0;
2664         u32 i;
2665
2666         dev_dbg(&skdev->pdev->dev,
2667                 "skmsg_table kcalloc, struct %lu, count %u total %lu\n",
2668                 sizeof(struct skd_fitmsg_context), skdev->num_fitmsg_context,
2669                 sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
2670
2671         skdev->skmsg_table = kcalloc(skdev->num_fitmsg_context,
2672                                      sizeof(struct skd_fitmsg_context),
2673                                      GFP_KERNEL);
2674         if (skdev->skmsg_table == NULL) {
2675                 rc = -ENOMEM;
2676                 goto err_out;
2677         }
2678
2679         for (i = 0; i < skdev->num_fitmsg_context; i++) {
2680                 struct skd_fitmsg_context *skmsg;
2681
2682                 skmsg = &skdev->skmsg_table[i];
2683
2684                 skmsg->id = i + SKD_ID_FIT_MSG;
2685
2686                 skmsg->msg_buf = dma_alloc_coherent(&skdev->pdev->dev,
2687                                                     SKD_N_FITMSG_BYTES,
2688                                                     &skmsg->mb_dma_address,
2689                                                     GFP_KERNEL);
2690                 if (skmsg->msg_buf == NULL) {
2691                         rc = -ENOMEM;
2692                         goto err_out;
2693                 }
2694
2695                 WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) &
2696                      (FIT_QCMD_ALIGN - 1),
2697                      "not aligned: msg_buf %p mb_dma_address %pad\n",
2698                      skmsg->msg_buf, &skmsg->mb_dma_address);
2699                 memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
2700         }
2701
2702 err_out:
2703         return rc;
2704 }
2705
2706 static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
2707                                                   u32 n_sg,
2708                                                   dma_addr_t *ret_dma_addr)
2709 {
2710         struct fit_sg_descriptor *sg_list;
2711
2712         sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr,
2713                                 GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2714
2715         if (sg_list != NULL) {
2716                 uint64_t dma_address = *ret_dma_addr;
2717                 u32 i;
2718
2719                 for (i = 0; i < n_sg - 1; i++) {
2720                         uint64_t ndp_off;
2721                         ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
2722
2723                         sg_list[i].next_desc_ptr = dma_address + ndp_off;
2724                 }
2725                 sg_list[i].next_desc_ptr = 0LL;
2726         }
2727
2728         return sg_list;
2729 }
2730
2731 static void skd_free_sg_list(struct skd_device *skdev,
2732                              struct fit_sg_descriptor *sg_list,
2733                              dma_addr_t dma_addr)
2734 {
2735         if (WARN_ON_ONCE(!sg_list))
2736                 return;
2737
2738         skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr,
2739                      DMA_TO_DEVICE);
2740 }
2741
2742 static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
2743                             unsigned int hctx_idx, unsigned int numa_node)
2744 {
2745         struct skd_device *skdev = set->driver_data;
2746         struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2747
2748         skreq->state = SKD_REQ_STATE_IDLE;
2749         skreq->sg = (void *)(skreq + 1);
2750         sg_init_table(skreq->sg, skd_sgs_per_request);
2751         skreq->sksg_list = skd_cons_sg_list(skdev, skd_sgs_per_request,
2752                                             &skreq->sksg_dma_address);
2753
2754         return skreq->sksg_list ? 0 : -ENOMEM;
2755 }
2756
2757 static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
2758                              unsigned int hctx_idx)
2759 {
2760         struct skd_device *skdev = set->driver_data;
2761         struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2762
2763         skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address);
2764 }
2765
2766 static int skd_cons_sksb(struct skd_device *skdev)
2767 {
2768         int rc = 0;
2769         struct skd_special_context *skspcl;
2770
2771         skspcl = &skdev->internal_skspcl;
2772
2773         skspcl->req.id = 0 + SKD_ID_INTERNAL;
2774         skspcl->req.state = SKD_REQ_STATE_IDLE;
2775
2776         skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache,
2777                                          &skspcl->db_dma_address,
2778                                          GFP_DMA | __GFP_ZERO,
2779                                          DMA_BIDIRECTIONAL);
2780         if (skspcl->data_buf == NULL) {
2781                 rc = -ENOMEM;
2782                 goto err_out;
2783         }
2784
2785         skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache,
2786                                         &skspcl->mb_dma_address,
2787                                         GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2788         if (skspcl->msg_buf == NULL) {
2789                 rc = -ENOMEM;
2790                 goto err_out;
2791         }
2792
2793         skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
2794                                                  &skspcl->req.sksg_dma_address);
2795         if (skspcl->req.sksg_list == NULL) {
2796                 rc = -ENOMEM;
2797                 goto err_out;
2798         }
2799
2800         if (!skd_format_internal_skspcl(skdev)) {
2801                 rc = -EINVAL;
2802                 goto err_out;
2803         }
2804
2805 err_out:
2806         return rc;
2807 }
2808
2809 static const struct blk_mq_ops skd_mq_ops = {
2810         .queue_rq       = skd_mq_queue_rq,
2811         .complete       = skd_complete_rq,
2812         .timeout        = skd_timed_out,
2813         .init_request   = skd_init_request,
2814         .exit_request   = skd_exit_request,
2815 };
2816
2817 static int skd_cons_disk(struct skd_device *skdev)
2818 {
2819         int rc = 0;
2820         struct gendisk *disk;
2821         struct request_queue *q;
2822         unsigned long flags;
2823
2824         disk = alloc_disk(SKD_MINORS_PER_DEVICE);
2825         if (!disk) {
2826                 rc = -ENOMEM;
2827                 goto err_out;
2828         }
2829
2830         skdev->disk = disk;
2831         sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
2832
2833         disk->major = skdev->major;
2834         disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
2835         disk->fops = &skd_blockdev_ops;
2836         disk->private_data = skdev;
2837
2838         memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
2839         skdev->tag_set.ops = &skd_mq_ops;
2840         skdev->tag_set.nr_hw_queues = 1;
2841         skdev->tag_set.queue_depth = skd_max_queue_depth;
2842         skdev->tag_set.cmd_size = sizeof(struct skd_request_context) +
2843                 skdev->sgs_per_request * sizeof(struct scatterlist);
2844         skdev->tag_set.numa_node = NUMA_NO_NODE;
2845         skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
2846                 BLK_MQ_F_SG_MERGE |
2847                 BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
2848         skdev->tag_set.driver_data = skdev;
2849         rc = blk_mq_alloc_tag_set(&skdev->tag_set);
2850         if (rc)
2851                 goto err_out;
2852         q = blk_mq_init_queue(&skdev->tag_set);
2853         if (IS_ERR(q)) {
2854                 blk_mq_free_tag_set(&skdev->tag_set);
2855                 rc = PTR_ERR(q);
2856                 goto err_out;
2857         }
2858         q->queuedata = skdev;
2859
2860         skdev->queue = q;
2861         disk->queue = q;
2862
2863         blk_queue_write_cache(q, true, true);
2864         blk_queue_max_segments(q, skdev->sgs_per_request);
2865         blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
2866
2867         /* set optimal I/O size to 8KB */
2868         blk_queue_io_opt(q, 8192);
2869
2870         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2871         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2872
2873         blk_queue_rq_timeout(q, 8 * HZ);
2874
2875         spin_lock_irqsave(&skdev->lock, flags);
2876         dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2877         blk_mq_stop_hw_queues(skdev->queue);
2878         spin_unlock_irqrestore(&skdev->lock, flags);
2879
2880 err_out:
2881         return rc;
2882 }
2883
2884 #define SKD_N_DEV_TABLE         16u
2885 static u32 skd_next_devno;
2886
2887 static struct skd_device *skd_construct(struct pci_dev *pdev)
2888 {
2889         struct skd_device *skdev;
2890         int blk_major = skd_major;
2891         size_t size;
2892         int rc;
2893
2894         skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
2895
2896         if (!skdev) {
2897                 dev_err(&pdev->dev, "memory alloc failure\n");
2898                 return NULL;
2899         }
2900
2901         skdev->state = SKD_DRVR_STATE_LOAD;
2902         skdev->pdev = pdev;
2903         skdev->devno = skd_next_devno++;
2904         skdev->major = blk_major;
2905         skdev->dev_max_queue_depth = 0;
2906
2907         skdev->num_req_context = skd_max_queue_depth;
2908         skdev->num_fitmsg_context = skd_max_queue_depth;
2909         skdev->cur_max_queue_depth = 1;
2910         skdev->queue_low_water_mark = 1;
2911         skdev->proto_ver = 99;
2912         skdev->sgs_per_request = skd_sgs_per_request;
2913         skdev->dbg_level = skd_dbg_level;
2914
2915         spin_lock_init(&skdev->lock);
2916
2917         INIT_WORK(&skdev->start_queue, skd_start_queue);
2918         INIT_WORK(&skdev->completion_worker, skd_completion_worker);
2919
2920         size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES);
2921         skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0,
2922                                                 SLAB_HWCACHE_ALIGN, NULL);
2923         if (!skdev->msgbuf_cache)
2924                 goto err_out;
2925         WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size,
2926                   "skd-msgbuf: %d < %zd\n",
2927                   kmem_cache_size(skdev->msgbuf_cache), size);
2928         size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor);
2929         skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0,
2930                                                 SLAB_HWCACHE_ALIGN, NULL);
2931         if (!skdev->sglist_cache)
2932                 goto err_out;
2933         WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size,
2934                   "skd-sglist: %d < %zd\n",
2935                   kmem_cache_size(skdev->sglist_cache), size);
2936         size = SKD_N_INTERNAL_BYTES;
2937         skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0,
2938                                                  SLAB_HWCACHE_ALIGN, NULL);
2939         if (!skdev->databuf_cache)
2940                 goto err_out;
2941         WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size,
2942                   "skd-databuf: %d < %zd\n",
2943                   kmem_cache_size(skdev->databuf_cache), size);
2944
2945         dev_dbg(&skdev->pdev->dev, "skcomp\n");
2946         rc = skd_cons_skcomp(skdev);
2947         if (rc < 0)
2948                 goto err_out;
2949
2950         dev_dbg(&skdev->pdev->dev, "skmsg\n");
2951         rc = skd_cons_skmsg(skdev);
2952         if (rc < 0)
2953                 goto err_out;
2954
2955         dev_dbg(&skdev->pdev->dev, "sksb\n");
2956         rc = skd_cons_sksb(skdev);
2957         if (rc < 0)
2958                 goto err_out;
2959
2960         dev_dbg(&skdev->pdev->dev, "disk\n");
2961         rc = skd_cons_disk(skdev);
2962         if (rc < 0)
2963                 goto err_out;
2964
2965         dev_dbg(&skdev->pdev->dev, "VICTORY\n");
2966         return skdev;
2967
2968 err_out:
2969         dev_dbg(&skdev->pdev->dev, "construct failed\n");
2970         skd_destruct(skdev);
2971         return NULL;
2972 }
2973
2974 /*
2975  *****************************************************************************
2976  * DESTRUCT (FREE)
2977  *****************************************************************************
2978  */
2979
2980 static void skd_free_skcomp(struct skd_device *skdev)
2981 {
2982         if (skdev->skcomp_table)
2983                 dma_free_coherent(&skdev->pdev->dev, SKD_SKCOMP_SIZE,
2984                                   skdev->skcomp_table, skdev->cq_dma_address);
2985
2986         skdev->skcomp_table = NULL;
2987         skdev->cq_dma_address = 0;
2988 }
2989
2990 static void skd_free_skmsg(struct skd_device *skdev)
2991 {
2992         u32 i;
2993
2994         if (skdev->skmsg_table == NULL)
2995                 return;
2996
2997         for (i = 0; i < skdev->num_fitmsg_context; i++) {
2998                 struct skd_fitmsg_context *skmsg;
2999
3000                 skmsg = &skdev->skmsg_table[i];
3001
3002                 if (skmsg->msg_buf != NULL) {
3003                         dma_free_coherent(&skdev->pdev->dev, SKD_N_FITMSG_BYTES,
3004                                           skmsg->msg_buf,
3005                                             skmsg->mb_dma_address);
3006                 }
3007                 skmsg->msg_buf = NULL;
3008                 skmsg->mb_dma_address = 0;
3009         }
3010
3011         kfree(skdev->skmsg_table);
3012         skdev->skmsg_table = NULL;
3013 }
3014
3015 static void skd_free_sksb(struct skd_device *skdev)
3016 {
3017         struct skd_special_context *skspcl = &skdev->internal_skspcl;
3018
3019         skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf,
3020                      skspcl->db_dma_address, DMA_BIDIRECTIONAL);
3021
3022         skspcl->data_buf = NULL;
3023         skspcl->db_dma_address = 0;
3024
3025         skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf,
3026                      skspcl->mb_dma_address, DMA_TO_DEVICE);
3027
3028         skspcl->msg_buf = NULL;
3029         skspcl->mb_dma_address = 0;
3030
3031         skd_free_sg_list(skdev, skspcl->req.sksg_list,
3032                          skspcl->req.sksg_dma_address);
3033
3034         skspcl->req.sksg_list = NULL;
3035         skspcl->req.sksg_dma_address = 0;
3036 }
3037
3038 static void skd_free_disk(struct skd_device *skdev)
3039 {
3040         struct gendisk *disk = skdev->disk;
3041
3042         if (disk && (disk->flags & GENHD_FL_UP))
3043                 del_gendisk(disk);
3044
3045         if (skdev->queue) {
3046                 blk_cleanup_queue(skdev->queue);
3047                 skdev->queue = NULL;
3048                 if (disk)
3049                         disk->queue = NULL;
3050         }
3051
3052         if (skdev->tag_set.tags)
3053                 blk_mq_free_tag_set(&skdev->tag_set);
3054
3055         put_disk(disk);
3056         skdev->disk = NULL;
3057 }
3058
3059 static void skd_destruct(struct skd_device *skdev)
3060 {
3061         if (skdev == NULL)
3062                 return;
3063
3064         cancel_work_sync(&skdev->start_queue);
3065
3066         dev_dbg(&skdev->pdev->dev, "disk\n");
3067         skd_free_disk(skdev);
3068
3069         dev_dbg(&skdev->pdev->dev, "sksb\n");
3070         skd_free_sksb(skdev);
3071
3072         dev_dbg(&skdev->pdev->dev, "skmsg\n");
3073         skd_free_skmsg(skdev);
3074
3075         dev_dbg(&skdev->pdev->dev, "skcomp\n");
3076         skd_free_skcomp(skdev);
3077
3078         kmem_cache_destroy(skdev->databuf_cache);
3079         kmem_cache_destroy(skdev->sglist_cache);
3080         kmem_cache_destroy(skdev->msgbuf_cache);
3081
3082         dev_dbg(&skdev->pdev->dev, "skdev\n");
3083         kfree(skdev);
3084 }
3085
3086 /*
3087  *****************************************************************************
3088  * BLOCK DEVICE (BDEV) GLUE
3089  *****************************************************************************
3090  */
3091
3092 static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3093 {
3094         struct skd_device *skdev;
3095         u64 capacity;
3096
3097         skdev = bdev->bd_disk->private_data;
3098
3099         dev_dbg(&skdev->pdev->dev, "%s: CMD[%s] getgeo device\n",
3100                 bdev->bd_disk->disk_name, current->comm);
3101
3102         if (skdev->read_cap_is_valid) {
3103                 capacity = get_capacity(skdev->disk);
3104                 geo->heads = 64;
3105                 geo->sectors = 255;
3106                 geo->cylinders = (capacity) / (255 * 64);
3107
3108                 return 0;
3109         }
3110         return -EIO;
3111 }
3112
3113 static int skd_bdev_attach(struct device *parent, struct skd_device *skdev)
3114 {
3115         dev_dbg(&skdev->pdev->dev, "add_disk\n");
3116         device_add_disk(parent, skdev->disk, NULL);
3117         return 0;
3118 }
3119
3120 static const struct block_device_operations skd_blockdev_ops = {
3121         .owner          = THIS_MODULE,
3122         .getgeo         = skd_bdev_getgeo,
3123 };
3124
3125 /*
3126  *****************************************************************************
3127  * PCIe DRIVER GLUE
3128  *****************************************************************************
3129  */
3130
3131 static const struct pci_device_id skd_pci_tbl[] = {
3132         { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
3133           PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
3134         { 0 }                     /* terminate list */
3135 };
3136
3137 MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
3138
3139 static char *skd_pci_info(struct skd_device *skdev, char *str)
3140 {
3141         int pcie_reg;
3142
3143         strcpy(str, "PCIe (");
3144         pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
3145
3146         if (pcie_reg) {
3147
3148                 char lwstr[6];
3149                 uint16_t pcie_lstat, lspeed, lwidth;
3150
3151                 pcie_reg += 0x12;
3152                 pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
3153                 lspeed = pcie_lstat & (0xF);
3154                 lwidth = (pcie_lstat & 0x3F0) >> 4;
3155
3156                 if (lspeed == 1)
3157                         strcat(str, "2.5GT/s ");
3158                 else if (lspeed == 2)
3159                         strcat(str, "5.0GT/s ");
3160                 else
3161                         strcat(str, "<unknown> ");
3162                 snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
3163                 strcat(str, lwstr);
3164         }
3165         return str;
3166 }
3167
3168 static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
3169 {
3170         int i;
3171         int rc = 0;
3172         char pci_str[32];
3173         struct skd_device *skdev;
3174
3175         dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor,
3176                 pdev->device);
3177
3178         rc = pci_enable_device(pdev);
3179         if (rc)
3180                 return rc;
3181         rc = pci_request_regions(pdev, DRV_NAME);
3182         if (rc)
3183                 goto err_out;
3184         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3185         if (rc)
3186                 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
3187         if (rc) {
3188                 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3189                 goto err_out_regions;
3190         }
3191
3192         if (!skd_major) {
3193                 rc = register_blkdev(0, DRV_NAME);
3194                 if (rc < 0)
3195                         goto err_out_regions;
3196                 BUG_ON(!rc);
3197                 skd_major = rc;
3198         }
3199
3200         skdev = skd_construct(pdev);
3201         if (skdev == NULL) {
3202                 rc = -ENOMEM;
3203                 goto err_out_regions;
3204         }
3205
3206         skd_pci_info(skdev, pci_str);
3207         dev_info(&pdev->dev, "%s 64bit\n", pci_str);
3208
3209         pci_set_master(pdev);
3210         rc = pci_enable_pcie_error_reporting(pdev);
3211         if (rc) {
3212                 dev_err(&pdev->dev,
3213                         "bad enable of PCIe error reporting rc=%d\n", rc);
3214                 skdev->pcie_error_reporting_is_enabled = 0;
3215         } else
3216                 skdev->pcie_error_reporting_is_enabled = 1;
3217
3218         pci_set_drvdata(pdev, skdev);
3219
3220         for (i = 0; i < SKD_MAX_BARS; i++) {
3221                 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3222                 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3223                 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3224                                             skdev->mem_size[i]);
3225                 if (!skdev->mem_map[i]) {
3226                         dev_err(&pdev->dev,
3227                                 "Unable to map adapter memory!\n");
3228                         rc = -ENODEV;
3229                         goto err_out_iounmap;
3230                 }
3231                 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3232                         skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3233                         skdev->mem_size[i]);
3234         }
3235
3236         rc = skd_acquire_irq(skdev);
3237         if (rc) {
3238                 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3239                 goto err_out_iounmap;
3240         }
3241
3242         rc = skd_start_timer(skdev);
3243         if (rc)
3244                 goto err_out_timer;
3245
3246         init_waitqueue_head(&skdev->waitq);
3247
3248         skd_start_device(skdev);
3249
3250         rc = wait_event_interruptible_timeout(skdev->waitq,
3251                                               (skdev->gendisk_on),
3252                                               (SKD_START_WAIT_SECONDS * HZ));
3253         if (skdev->gendisk_on > 0) {
3254                 /* device came on-line after reset */
3255                 skd_bdev_attach(&pdev->dev, skdev);
3256                 rc = 0;
3257         } else {
3258                 /* we timed out, something is wrong with the device,
3259                    don't add the disk structure */
3260                 dev_err(&pdev->dev, "error: waiting for s1120 timed out %d!\n",
3261                         rc);
3262                 /* in case of no error; we timeout with ENXIO */
3263                 if (!rc)
3264                         rc = -ENXIO;
3265                 goto err_out_timer;
3266         }
3267
3268         return rc;
3269
3270 err_out_timer:
3271         skd_stop_device(skdev);
3272         skd_release_irq(skdev);
3273
3274 err_out_iounmap:
3275         for (i = 0; i < SKD_MAX_BARS; i++)
3276                 if (skdev->mem_map[i])
3277                         iounmap(skdev->mem_map[i]);
3278
3279         if (skdev->pcie_error_reporting_is_enabled)
3280                 pci_disable_pcie_error_reporting(pdev);
3281
3282         skd_destruct(skdev);
3283
3284 err_out_regions:
3285         pci_release_regions(pdev);
3286
3287 err_out:
3288         pci_disable_device(pdev);
3289         pci_set_drvdata(pdev, NULL);
3290         return rc;
3291 }
3292
3293 static void skd_pci_remove(struct pci_dev *pdev)
3294 {
3295         int i;
3296         struct skd_device *skdev;
3297
3298         skdev = pci_get_drvdata(pdev);
3299         if (!skdev) {
3300                 dev_err(&pdev->dev, "no device data for PCI\n");
3301                 return;
3302         }
3303         skd_stop_device(skdev);
3304         skd_release_irq(skdev);
3305
3306         for (i = 0; i < SKD_MAX_BARS; i++)
3307                 if (skdev->mem_map[i])
3308                         iounmap(skdev->mem_map[i]);
3309
3310         if (skdev->pcie_error_reporting_is_enabled)
3311                 pci_disable_pcie_error_reporting(pdev);
3312
3313         skd_destruct(skdev);
3314
3315         pci_release_regions(pdev);
3316         pci_disable_device(pdev);
3317         pci_set_drvdata(pdev, NULL);
3318
3319         return;
3320 }
3321
3322 static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
3323 {
3324         int i;
3325         struct skd_device *skdev;
3326
3327         skdev = pci_get_drvdata(pdev);
3328         if (!skdev) {
3329                 dev_err(&pdev->dev, "no device data for PCI\n");
3330                 return -EIO;
3331         }
3332
3333         skd_stop_device(skdev);
3334
3335         skd_release_irq(skdev);
3336
3337         for (i = 0; i < SKD_MAX_BARS; i++)
3338                 if (skdev->mem_map[i])
3339                         iounmap(skdev->mem_map[i]);
3340
3341         if (skdev->pcie_error_reporting_is_enabled)
3342                 pci_disable_pcie_error_reporting(pdev);
3343
3344         pci_release_regions(pdev);
3345         pci_save_state(pdev);
3346         pci_disable_device(pdev);
3347         pci_set_power_state(pdev, pci_choose_state(pdev, state));
3348         return 0;
3349 }
3350
3351 static int skd_pci_resume(struct pci_dev *pdev)
3352 {
3353         int i;
3354         int rc = 0;
3355         struct skd_device *skdev;
3356
3357         skdev = pci_get_drvdata(pdev);
3358         if (!skdev) {
3359                 dev_err(&pdev->dev, "no device data for PCI\n");
3360                 return -1;
3361         }
3362
3363         pci_set_power_state(pdev, PCI_D0);
3364         pci_enable_wake(pdev, PCI_D0, 0);
3365         pci_restore_state(pdev);
3366
3367         rc = pci_enable_device(pdev);
3368         if (rc)
3369                 return rc;
3370         rc = pci_request_regions(pdev, DRV_NAME);
3371         if (rc)
3372                 goto err_out;
3373         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3374         if (rc)
3375                 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
3376         if (rc) {
3377                 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3378                 goto err_out_regions;
3379         }
3380
3381         pci_set_master(pdev);
3382         rc = pci_enable_pcie_error_reporting(pdev);
3383         if (rc) {
3384                 dev_err(&pdev->dev,
3385                         "bad enable of PCIe error reporting rc=%d\n", rc);
3386                 skdev->pcie_error_reporting_is_enabled = 0;
3387         } else
3388                 skdev->pcie_error_reporting_is_enabled = 1;
3389
3390         for (i = 0; i < SKD_MAX_BARS; i++) {
3391
3392                 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3393                 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3394                 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3395                                             skdev->mem_size[i]);
3396                 if (!skdev->mem_map[i]) {
3397                         dev_err(&pdev->dev, "Unable to map adapter memory!\n");
3398                         rc = -ENODEV;
3399                         goto err_out_iounmap;
3400                 }
3401                 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3402                         skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3403                         skdev->mem_size[i]);
3404         }
3405         rc = skd_acquire_irq(skdev);
3406         if (rc) {
3407                 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3408                 goto err_out_iounmap;
3409         }
3410
3411         rc = skd_start_timer(skdev);
3412         if (rc)
3413                 goto err_out_timer;
3414
3415         init_waitqueue_head(&skdev->waitq);
3416
3417         skd_start_device(skdev);
3418
3419         return rc;
3420
3421 err_out_timer:
3422         skd_stop_device(skdev);
3423         skd_release_irq(skdev);
3424
3425 err_out_iounmap:
3426         for (i = 0; i < SKD_MAX_BARS; i++)
3427                 if (skdev->mem_map[i])
3428                         iounmap(skdev->mem_map[i]);
3429
3430         if (skdev->pcie_error_reporting_is_enabled)
3431                 pci_disable_pcie_error_reporting(pdev);
3432
3433 err_out_regions:
3434         pci_release_regions(pdev);
3435
3436 err_out:
3437         pci_disable_device(pdev);
3438         return rc;
3439 }
3440
3441 static void skd_pci_shutdown(struct pci_dev *pdev)
3442 {
3443         struct skd_device *skdev;
3444
3445         dev_err(&pdev->dev, "%s called\n", __func__);
3446
3447         skdev = pci_get_drvdata(pdev);
3448         if (!skdev) {
3449                 dev_err(&pdev->dev, "no device data for PCI\n");
3450                 return;
3451         }
3452
3453         dev_err(&pdev->dev, "calling stop\n");
3454         skd_stop_device(skdev);
3455 }
3456
3457 static struct pci_driver skd_driver = {
3458         .name           = DRV_NAME,
3459         .id_table       = skd_pci_tbl,
3460         .probe          = skd_pci_probe,
3461         .remove         = skd_pci_remove,
3462         .suspend        = skd_pci_suspend,
3463         .resume         = skd_pci_resume,
3464         .shutdown       = skd_pci_shutdown,
3465 };
3466
3467 /*
3468  *****************************************************************************
3469  * LOGGING SUPPORT
3470  *****************************************************************************
3471  */
3472
3473 const char *skd_drive_state_to_str(int state)
3474 {
3475         switch (state) {
3476         case FIT_SR_DRIVE_OFFLINE:
3477                 return "OFFLINE";
3478         case FIT_SR_DRIVE_INIT:
3479                 return "INIT";
3480         case FIT_SR_DRIVE_ONLINE:
3481                 return "ONLINE";
3482         case FIT_SR_DRIVE_BUSY:
3483                 return "BUSY";
3484         case FIT_SR_DRIVE_FAULT:
3485                 return "FAULT";
3486         case FIT_SR_DRIVE_DEGRADED:
3487                 return "DEGRADED";
3488         case FIT_SR_PCIE_LINK_DOWN:
3489                 return "INK_DOWN";
3490         case FIT_SR_DRIVE_SOFT_RESET:
3491                 return "SOFT_RESET";
3492         case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
3493                 return "NEED_FW";
3494         case FIT_SR_DRIVE_INIT_FAULT:
3495                 return "INIT_FAULT";
3496         case FIT_SR_DRIVE_BUSY_SANITIZE:
3497                 return "BUSY_SANITIZE";
3498         case FIT_SR_DRIVE_BUSY_ERASE:
3499                 return "BUSY_ERASE";
3500         case FIT_SR_DRIVE_FW_BOOTING:
3501                 return "FW_BOOTING";
3502         default:
3503                 return "???";
3504         }
3505 }
3506
3507 const char *skd_skdev_state_to_str(enum skd_drvr_state state)
3508 {
3509         switch (state) {
3510         case SKD_DRVR_STATE_LOAD:
3511                 return "LOAD";
3512         case SKD_DRVR_STATE_IDLE:
3513                 return "IDLE";
3514         case SKD_DRVR_STATE_BUSY:
3515                 return "BUSY";
3516         case SKD_DRVR_STATE_STARTING:
3517                 return "STARTING";
3518         case SKD_DRVR_STATE_ONLINE:
3519                 return "ONLINE";
3520         case SKD_DRVR_STATE_PAUSING:
3521                 return "PAUSING";
3522         case SKD_DRVR_STATE_PAUSED:
3523                 return "PAUSED";
3524         case SKD_DRVR_STATE_RESTARTING:
3525                 return "RESTARTING";
3526         case SKD_DRVR_STATE_RESUMING:
3527                 return "RESUMING";
3528         case SKD_DRVR_STATE_STOPPING:
3529                 return "STOPPING";
3530         case SKD_DRVR_STATE_SYNCING:
3531                 return "SYNCING";
3532         case SKD_DRVR_STATE_FAULT:
3533                 return "FAULT";
3534         case SKD_DRVR_STATE_DISAPPEARED:
3535                 return "DISAPPEARED";
3536         case SKD_DRVR_STATE_BUSY_ERASE:
3537                 return "BUSY_ERASE";
3538         case SKD_DRVR_STATE_BUSY_SANITIZE:
3539                 return "BUSY_SANITIZE";
3540         case SKD_DRVR_STATE_BUSY_IMMINENT:
3541                 return "BUSY_IMMINENT";
3542         case SKD_DRVR_STATE_WAIT_BOOT:
3543                 return "WAIT_BOOT";
3544
3545         default:
3546                 return "???";
3547         }
3548 }
3549
3550 static const char *skd_skreq_state_to_str(enum skd_req_state state)
3551 {
3552         switch (state) {
3553         case SKD_REQ_STATE_IDLE:
3554                 return "IDLE";
3555         case SKD_REQ_STATE_SETUP:
3556                 return "SETUP";
3557         case SKD_REQ_STATE_BUSY:
3558                 return "BUSY";
3559         case SKD_REQ_STATE_COMPLETED:
3560                 return "COMPLETED";
3561         case SKD_REQ_STATE_TIMEOUT:
3562                 return "TIMEOUT";
3563         default:
3564                 return "???";
3565         }
3566 }
3567
3568 static void skd_log_skdev(struct skd_device *skdev, const char *event)
3569 {
3570         dev_dbg(&skdev->pdev->dev, "skdev=%p event='%s'\n", skdev, event);
3571         dev_dbg(&skdev->pdev->dev, "  drive_state=%s(%d) driver_state=%s(%d)\n",
3572                 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
3573                 skd_skdev_state_to_str(skdev->state), skdev->state);
3574         dev_dbg(&skdev->pdev->dev, "  busy=%d limit=%d dev=%d lowat=%d\n",
3575                 skd_in_flight(skdev), skdev->cur_max_queue_depth,
3576                 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
3577         dev_dbg(&skdev->pdev->dev, "  cycle=%d cycle_ix=%d\n",
3578                 skdev->skcomp_cycle, skdev->skcomp_ix);
3579 }
3580
3581 static void skd_log_skreq(struct skd_device *skdev,
3582                           struct skd_request_context *skreq, const char *event)
3583 {
3584         struct request *req = blk_mq_rq_from_pdu(skreq);
3585         u32 lba = blk_rq_pos(req);
3586         u32 count = blk_rq_sectors(req);
3587
3588         dev_dbg(&skdev->pdev->dev, "skreq=%p event='%s'\n", skreq, event);
3589         dev_dbg(&skdev->pdev->dev, "  state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
3590                 skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id,
3591                 skreq->fitmsg_id);
3592         dev_dbg(&skdev->pdev->dev, "  sg_dir=%d n_sg=%d\n",
3593                 skreq->data_dir, skreq->n_sg);
3594
3595         dev_dbg(&skdev->pdev->dev,
3596                 "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba,
3597                 count, count, (int)rq_data_dir(req));
3598 }
3599
3600 /*
3601  *****************************************************************************
3602  * MODULE GLUE
3603  *****************************************************************************
3604  */
3605
3606 static int __init skd_init(void)
3607 {
3608         BUILD_BUG_ON(sizeof(struct fit_completion_entry_v1) != 8);
3609         BUILD_BUG_ON(sizeof(struct fit_comp_error_info) != 32);
3610         BUILD_BUG_ON(sizeof(struct skd_command_header) != 16);
3611         BUILD_BUG_ON(sizeof(struct skd_scsi_request) != 32);
3612         BUILD_BUG_ON(sizeof(struct driver_inquiry_data) != 44);
3613         BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
3614         BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
3615         BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
3616
3617         switch (skd_isr_type) {
3618         case SKD_IRQ_LEGACY:
3619         case SKD_IRQ_MSI:
3620         case SKD_IRQ_MSIX:
3621                 break;
3622         default:
3623                 pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n",
3624                        skd_isr_type, SKD_IRQ_DEFAULT);
3625                 skd_isr_type = SKD_IRQ_DEFAULT;
3626         }
3627
3628         if (skd_max_queue_depth < 1 ||
3629             skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
3630                 pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n",
3631                        skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
3632                 skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
3633         }
3634
3635         if (skd_max_req_per_msg < 1 ||
3636             skd_max_req_per_msg > SKD_MAX_REQ_PER_MSG) {
3637                 pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n",
3638                        skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
3639                 skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
3640         }
3641
3642         if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
3643                 pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n",
3644                        skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
3645                 skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
3646         }
3647
3648         if (skd_dbg_level < 0 || skd_dbg_level > 2) {
3649                 pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n",
3650                        skd_dbg_level, 0);
3651                 skd_dbg_level = 0;
3652         }
3653
3654         if (skd_isr_comp_limit < 0) {
3655                 pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n",
3656                        skd_isr_comp_limit, 0);
3657                 skd_isr_comp_limit = 0;
3658         }
3659
3660         return pci_register_driver(&skd_driver);
3661 }
3662
3663 static void __exit skd_exit(void)
3664 {
3665         pci_unregister_driver(&skd_driver);
3666
3667         if (skd_major)
3668                 unregister_blkdev(skd_major, DRV_NAME);
3669 }
3670
3671 module_init(skd_init);
3672 module_exit(skd_exit);