drivers/block/nvme-core.c

   1 /*
   2  * NVM Express device driver
   3  * Copyright (c) 2011, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <linux/nvme.h>
  20 #include <linux/bio.h>
  21 #include <linux/bitops.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/delay.h>
  24 #include <linux/errno.h>
  25 #include <linux/fs.h>
  26 #include <linux/genhd.h>
  27 #include <linux/idr.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/io.h>
  31 #include <linux/kdev_t.h>
  32 #include <linux/kthread.h>
  33 #include <linux/kernel.h>
  34 #include <linux/mm.h>
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/pci.h>
  38 #include <linux/poison.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/sched.h>
  41 #include <linux/slab.h>
  42 #include <linux/types.h>
  43 #include <scsi/sg.h>
  44 #include <asm-generic/io-64-nonatomic-lo-hi.h>
  45
  46 #define NVME_Q_DEPTH 1024
  47 #define SQ_SIZE(depth)          (depth * sizeof(struct nvme_command))
  48 #define CQ_SIZE(depth)          (depth * sizeof(struct nvme_completion))
  49 #define ADMIN_TIMEOUT   (60 * HZ)
  50
  51 static int nvme_major;
  52 module_param(nvme_major, int, 0);
  53
  54 static int use_threaded_interrupts;
  55 module_param(use_threaded_interrupts, int, 0);
  56
  57 static DEFINE_SPINLOCK(dev_list_lock);
  58 static LIST_HEAD(dev_list);
  59 static struct task_struct *nvme_thread;
  60 static struct workqueue_struct *nvme_workq;
  61
  62 static void nvme_reset_failed_dev(struct work_struct *ws);
  63
  64 struct async_cmd_info {
  65         struct kthread_work work;
  66         struct kthread_worker *worker;
  67         u32 result;
  68         int status;
  69         void *ctx;
  70 };
  71
  72 /*
  73  * An NVM Express queue.  Each device has at least two (one for admin
  74  * commands and one for I/O commands).
  75  */
  76 struct nvme_queue {
  77         struct device *q_dmadev;
  78         struct nvme_dev *dev;
  79         char irqname[24];       /* nvme4294967295-65535\0 */
  80         spinlock_t q_lock;
  81         struct nvme_command *sq_cmds;
  82         volatile struct nvme_completion *cqes;
  83         dma_addr_t sq_dma_addr;
  84         dma_addr_t cq_dma_addr;
  85         wait_queue_head_t sq_full;
  86         wait_queue_t sq_cong_wait;
  87         struct bio_list sq_cong;
  88         u32 __iomem *q_db;
  89         u16 q_depth;
  90         u16 cq_vector;
  91         u16 sq_head;
  92         u16 sq_tail;
  93         u16 cq_head;
  94         u16 qid;
  95         u8 cq_phase;
  96         u8 cqe_seen;
  97         u8 q_suspended;
  98         struct async_cmd_info cmdinfo;
  99         unsigned long cmdid_data[];
 100 };
 101
 102 /*
 103  * Check we didin't inadvertently grow the command struct
 104  */
 105 static inline void _nvme_check_size(void)
 106 {
 107         BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
 108         BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
 109         BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
 110         BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
 111         BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
 112         BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
 113         BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
 114         BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
 115         BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096);
 116         BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096);
 117         BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
 118         BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
 119 }
 120
 121 typedef void (*nvme_completion_fn)(struct nvme_dev *, void *,
 122                                                 struct nvme_completion *);
 123
 124 struct nvme_cmd_info {
 125         nvme_completion_fn fn;
 126         void *ctx;
 127         unsigned long timeout;
 128         int aborted;
 129 };
 130
 131 static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq)
 132 {
 133         return (void *)&nvmeq->cmdid_data[BITS_TO_LONGS(nvmeq->q_depth)];
 134 }
 135
 136 static unsigned nvme_queue_extra(int depth)
 137 {
 138         return DIV_ROUND_UP(depth, 8) + (depth * sizeof(struct nvme_cmd_info));
 139 }
 140
 141 /**
 142  * alloc_cmdid() - Allocate a Command ID
 143  * @nvmeq: The queue that will be used for this command
 144  * @ctx: A pointer that will be passed to the handler
 145  * @handler: The function to call on completion
 146  *
 147  * Allocate a Command ID for a queue.  The data passed in will
 148  * be passed to the completion handler.  This is implemented by using
 149  * the bottom two bits of the ctx pointer to store the handler ID.
 150  * Passing in a pointer that's not 4-byte aligned will cause a BUG.
 151  * We can change this if it becomes a problem.
 152  *
 153  * May be called with local interrupts disabled and the q_lock held,
 154  * or with interrupts enabled and no locks held.
 155  */
 156 static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx,
 157                                 nvme_completion_fn handler, unsigned timeout)
 158 {
 159         int depth = nvmeq->q_depth - 1;
 160         struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
 161         int cmdid;
 162
 163         do {
 164                 cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth);
 165                 if (cmdid >= depth)
 166                         return -EBUSY;
 167         } while (test_and_set_bit(cmdid, nvmeq->cmdid_data));
 168
 169         info[cmdid].fn = handler;
 170         info[cmdid].ctx = ctx;
 171         info[cmdid].timeout = jiffies + timeout;
 172         info[cmdid].aborted = 0;
 173         return cmdid;
 174 }
 175
 176 static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx,
 177                                 nvme_completion_fn handler, unsigned timeout)
 178 {
 179         int cmdid;
 180         wait_event_killable(nvmeq->sq_full,
 181                 (cmdid = alloc_cmdid(nvmeq, ctx, handler, timeout)) >= 0);
 182         return (cmdid < 0) ? -EINTR : cmdid;
 183 }
 184
 185 /* Special values must be less than 0x1000 */
 186 #define CMD_CTX_BASE            ((void *)POISON_POINTER_DELTA)
 187 #define CMD_CTX_CANCELLED       (0x30C + CMD_CTX_BASE)
 188 #define CMD_CTX_COMPLETED       (0x310 + CMD_CTX_BASE)
 189 #define CMD_CTX_INVALID         (0x314 + CMD_CTX_BASE)
 190 #define CMD_CTX_FLUSH           (0x318 + CMD_CTX_BASE)
 191 #define CMD_CTX_ABORT           (0x31C + CMD_CTX_BASE)
 192
 193 static void special_completion(struct nvme_dev *dev, void *ctx,
 194                                                 struct nvme_completion *cqe)
 195 {
 196         if (ctx == CMD_CTX_CANCELLED)
 197                 return;
 198         if (ctx == CMD_CTX_FLUSH)
 199                 return;
 200         if (ctx == CMD_CTX_ABORT) {
 201                 ++dev->abort_limit;
 202                 return;
 203         }
 204         if (ctx == CMD_CTX_COMPLETED) {
 205                 dev_warn(&dev->pci_dev->dev,
 206                                 "completed id %d twice on queue %d\n",
 207                                 cqe->command_id, le16_to_cpup(&cqe->sq_id));
 208                 return;
 209         }
 210         if (ctx == CMD_CTX_INVALID) {
 211                 dev_warn(&dev->pci_dev->dev,
 212                                 "invalid id %d completed on queue %d\n",
 213                                 cqe->command_id, le16_to_cpup(&cqe->sq_id));
 214                 return;
 215         }
 216
 217         dev_warn(&dev->pci_dev->dev, "Unknown special completion %p\n", ctx);
 218 }
 219
 220 static void async_completion(struct nvme_dev *dev, void *ctx,
 221                                                 struct nvme_completion *cqe)
 222 {
 223         struct async_cmd_info *cmdinfo = ctx;
 224         cmdinfo->result = le32_to_cpup(&cqe->result);
 225         cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
 226         queue_kthread_work(cmdinfo->worker, &cmdinfo->work);
 227 }
 228
 229 /*
 230  * Called with local interrupts disabled and the q_lock held.  May not sleep.
 231  */
 232 static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid,
 233                                                 nvme_completion_fn *fn)
 234 {
 235         void *ctx;
 236         struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
 237
 238         if (cmdid >= nvmeq->q_depth) {
 239                 *fn = special_completion;
 240                 return CMD_CTX_INVALID;
 241         }
 242         if (fn)
 243                 *fn = info[cmdid].fn;
 244         ctx = info[cmdid].ctx;
 245         info[cmdid].fn = special_completion;
 246         info[cmdid].ctx = CMD_CTX_COMPLETED;
 247         clear_bit(cmdid, nvmeq->cmdid_data);
 248         wake_up(&nvmeq->sq_full);
 249         return ctx;
 250 }
 251
 252 static void *cancel_cmdid(struct nvme_queue *nvmeq, int cmdid,
 253                                                 nvme_completion_fn *fn)
 254 {
 255         void *ctx;
 256         struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
 257         if (fn)
 258                 *fn = info[cmdid].fn;
 259         ctx = info[cmdid].ctx;
 260         info[cmdid].fn = special_completion;
 261         info[cmdid].ctx = CMD_CTX_CANCELLED;
 262         return ctx;
 263 }
 264
 265 struct nvme_queue *get_nvmeq(struct nvme_dev *dev)
 266 {
 267         return dev->queues[get_cpu() + 1];
 268 }
 269
 270 void put_nvmeq(struct nvme_queue *nvmeq)
 271 {
 272         put_cpu();
 273 }
 274
 275 /**
 276  * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
 277  * @nvmeq: The queue to use
 278  * @cmd: The command to send
 279  *
 280  * Safe to use from interrupt context
 281  */
 282 static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
 283 {
 284         unsigned long flags;
 285         u16 tail;
 286         spin_lock_irqsave(&nvmeq->q_lock, flags);
 287         tail = nvmeq->sq_tail;
 288         memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
 289         if (++tail == nvmeq->q_depth)
 290                 tail = 0;
 291         writel(tail, nvmeq->q_db);
 292         nvmeq->sq_tail = tail;
 293         spin_unlock_irqrestore(&nvmeq->q_lock, flags);
 294
 295         return 0;
 296 }
 297
 298 static __le64 **iod_list(struct nvme_iod *iod)
 299 {
 300         return ((void *)iod) + iod->offset;
 301 }
 302
 303 /*
 304  * Will slightly overestimate the number of pages needed.  This is OK
 305  * as it only leads to a small amount of wasted memory for the lifetime of
 306  * the I/O.
 307  */
 308 static int nvme_npages(unsigned size)
 309 {
 310         unsigned nprps = DIV_ROUND_UP(size + PAGE_SIZE, PAGE_SIZE);
 311         return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
 312 }
 313
 314 static struct nvme_iod *
 315 nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp)
 316 {
 317         struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
 318                                 sizeof(__le64 *) * nvme_npages(nbytes) +
 319                                 sizeof(struct scatterlist) * nseg, gfp);
 320
 321         if (iod) {
 322                 iod->offset = offsetof(struct nvme_iod, sg[nseg]);
 323                 iod->npages = -1;
 324                 iod->length = nbytes;
 325                 iod->nents = 0;
 326                 iod->start_time = jiffies;
 327         }
 328
 329         return iod;
 330 }
 331
 332 void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
 333 {
 334         const int last_prp = PAGE_SIZE / 8 - 1;
 335         int i;
 336         __le64 **list = iod_list(iod);
 337         dma_addr_t prp_dma = iod->first_dma;
 338
 339         if (iod->npages == 0)
 340                 dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
 341         for (i = 0; i < iod->npages; i++) {
 342                 __le64 *prp_list = list[i];
 343                 dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);
 344                 dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
 345                 prp_dma = next_prp_dma;
 346         }
 347         kfree(iod);
 348 }
 349
 350 static void nvme_start_io_acct(struct bio *bio)
 351 {
 352         struct gendisk *disk = bio->bi_bdev->bd_disk;
 353         const int rw = bio_data_dir(bio);
 354         int cpu = part_stat_lock();
 355         part_round_stats(cpu, &disk->part0);
 356         part_stat_inc(cpu, &disk->part0, ios[rw]);
 357         part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
 358         part_inc_in_flight(&disk->part0, rw);
 359         part_stat_unlock();
 360 }
 361
 362 static void nvme_end_io_acct(struct bio *bio, unsigned long start_time)
 363 {
 364         struct gendisk *disk = bio->bi_bdev->bd_disk;
 365         const int rw = bio_data_dir(bio);
 366         unsigned long duration = jiffies - start_time;
 367         int cpu = part_stat_lock();
 368         part_stat_add(cpu, &disk->part0, ticks[rw], duration);
 369         part_round_stats(cpu, &disk->part0);
 370         part_dec_in_flight(&disk->part0, rw);
 371         part_stat_unlock();
 372 }
 373
 374 static void bio_completion(struct nvme_dev *dev, void *ctx,
 375                                                 struct nvme_completion *cqe)
 376 {
 377         struct nvme_iod *iod = ctx;
 378         struct bio *bio = iod->private;
 379         u16 status = le16_to_cpup(&cqe->status) >> 1;
 380
 381         if (iod->nents) {
 382                 dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
 383                         bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 384                 nvme_end_io_acct(bio, iod->start_time);
 385         }
 386         nvme_free_iod(dev, iod);
 387         if (status)
 388                 bio_endio(bio, -EIO);
 389         else
 390                 bio_endio(bio, 0);
 391 }
 392
 393 /* length is in bytes.  gfp flags indicates whether we may sleep. */
 394 int nvme_setup_prps(struct nvme_dev *dev, struct nvme_common_command *cmd,
 395                         struct nvme_iod *iod, int total_len, gfp_t gfp)
 396 {
 397         struct dma_pool *pool;
 398         int length = total_len;
 399         struct scatterlist *sg = iod->sg;
 400         int dma_len = sg_dma_len(sg);
 401         u64 dma_addr = sg_dma_address(sg);
 402         int offset = offset_in_page(dma_addr);
 403         __le64 *prp_list;
 404         __le64 **list = iod_list(iod);
 405         dma_addr_t prp_dma;
 406         int nprps, i;
 407
 408         cmd->prp1 = cpu_to_le64(dma_addr);
 409         length -= (PAGE_SIZE - offset);
 410         if (length <= 0)
 411                 return total_len;
 412
 413         dma_len -= (PAGE_SIZE - offset);
 414         if (dma_len) {
 415                 dma_addr += (PAGE_SIZE - offset);
 416         } else {
 417                 sg = sg_next(sg);
 418                 dma_addr = sg_dma_address(sg);
 419                 dma_len = sg_dma_len(sg);
 420         }
 421
 422         if (length <= PAGE_SIZE) {
 423                 cmd->prp2 = cpu_to_le64(dma_addr);
 424                 return total_len;
 425         }
 426
 427         nprps = DIV_ROUND_UP(length, PAGE_SIZE);
 428         if (nprps <= (256 / 8)) {
 429                 pool = dev->prp_small_pool;
 430                 iod->npages = 0;
 431         } else {
 432                 pool = dev->prp_page_pool;
 433                 iod->npages = 1;
 434         }
 435
 436         prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
 437         if (!prp_list) {
 438                 cmd->prp2 = cpu_to_le64(dma_addr);
 439                 iod->npages = -1;
 440                 return (total_len - length) + PAGE_SIZE;
 441         }
 442         list[0] = prp_list;
 443         iod->first_dma = prp_dma;
 444         cmd->prp2 = cpu_to_le64(prp_dma);
 445         i = 0;
 446         for (;;) {
 447                 if (i == PAGE_SIZE / 8) {
 448                         __le64 *old_prp_list = prp_list;
 449                         prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
 450                         if (!prp_list)
 451                                 return total_len - length;
 452                         list[iod->npages++] = prp_list;
 453                         prp_list[0] = old_prp_list[i - 1];
 454                         old_prp_list[i - 1] = cpu_to_le64(prp_dma);
 455                         i = 1;
 456                 }
 457                 prp_list[i++] = cpu_to_le64(dma_addr);
 458                 dma_len -= PAGE_SIZE;
 459                 dma_addr += PAGE_SIZE;
 460                 length -= PAGE_SIZE;
 461                 if (length <= 0)
 462                         break;
 463                 if (dma_len > 0)
 464                         continue;
 465                 BUG_ON(dma_len < 0);
 466                 sg = sg_next(sg);
 467                 dma_addr = sg_dma_address(sg);
 468                 dma_len = sg_dma_len(sg);
 469         }
 470
 471         return total_len;
 472 }
 473
 474 static int nvme_split_and_submit(struct bio *bio, struct nvme_queue *nvmeq,
 475                                  int len)
 476 {
 477         struct bio *split = bio_split(bio, len >> 9, GFP_ATOMIC, NULL);
 478         if (!split)
 479                 return -ENOMEM;
 480
 481         bio_chain(split, bio);
 482
 483         if (bio_list_empty(&nvmeq->sq_cong))
 484                 add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
 485         bio_list_add(&nvmeq->sq_cong, split);
 486         bio_list_add(&nvmeq->sq_cong, bio);
 487
 488         return 0;
 489 }
 490
 491 /* NVMe scatterlists require no holes in the virtual address */
 492 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2)   ((vec2)->bv_offset || \
 493                         (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
 494
 495 static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod,
 496                 struct bio *bio, enum dma_data_direction dma_dir, int psegs)
 497 {
 498         struct bio_vec bvec, bvprv;
 499         struct bvec_iter iter;
 500         struct scatterlist *sg = NULL;
 501         int length = 0, nsegs = 0, split_len = bio->bi_iter.bi_size;
 502         int first = 1;
 503
 504         if (nvmeq->dev->stripe_size)
 505                 split_len = nvmeq->dev->stripe_size -
 506                         ((bio->bi_iter.bi_sector << 9) &
 507                          (nvmeq->dev->stripe_size - 1));
 508
 509         sg_init_table(iod->sg, psegs);
 510         bio_for_each_segment(bvec, bio, iter) {
 511                 if (!first && BIOVEC_PHYS_MERGEABLE(&bvprv, &bvec)) {
 512                         sg->length += bvec.bv_len;
 513                 } else {
 514                         if (!first && BIOVEC_NOT_VIRT_MERGEABLE(&bvprv, &bvec))
 515                                 return nvme_split_and_submit(bio, nvmeq,
 516                                                              length);
 517
 518                         sg = sg ? sg + 1 : iod->sg;
 519                         sg_set_page(sg, bvec.bv_page,
 520                                     bvec.bv_len, bvec.bv_offset);
 521                         nsegs++;
 522                 }
 523
 524                 if (split_len - length < bvec.bv_len)
 525                         return nvme_split_and_submit(bio, nvmeq, split_len);
 526                 length += bvec.bv_len;
 527                 bvprv = bvec;
 528                 first = 0;
 529         }
 530         iod->nents = nsegs;
 531         sg_mark_end(sg);
 532         if (dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir) == 0)
 533                 return -ENOMEM;
 534
 535         BUG_ON(length != bio->bi_iter.bi_size);
 536         return length;
 537 }
 538
 539 /*
 540  * We reuse the small pool to allocate the 16-byte range here as it is not
 541  * worth having a special pool for these or additional cases to handle freeing
 542  * the iod.
 543  */
 544 static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 545                 struct bio *bio, struct nvme_iod *iod, int cmdid)
 546 {
 547         struct nvme_dsm_range *range;
 548         struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
 549
 550         range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC,
 551                                                         &iod->first_dma);
 552         if (!range)
 553                 return -ENOMEM;
 554
 555         iod_list(iod)[0] = (__le64 *)range;
 556         iod->npages = 0;
 557
 558         range->cattr = cpu_to_le32(0);
 559         range->nlb = cpu_to_le32(bio->bi_iter.bi_size >> ns->lba_shift);
 560         range->slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_iter.bi_sector));
 561
 562         memset(cmnd, 0, sizeof(*cmnd));
 563         cmnd->dsm.opcode = nvme_cmd_dsm;
 564         cmnd->dsm.command_id = cmdid;
 565         cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
 566         cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma);
 567         cmnd->dsm.nr = 0;
 568         cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
 569
 570         if (++nvmeq->sq_tail == nvmeq->q_depth)
 571                 nvmeq->sq_tail = 0;
 572         writel(nvmeq->sq_tail, nvmeq->q_db);
 573
 574         return 0;
 575 }
 576
 577 static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 578                                                                 int cmdid)
 579 {
 580         struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
 581
 582         memset(cmnd, 0, sizeof(*cmnd));
 583         cmnd->common.opcode = nvme_cmd_flush;
 584         cmnd->common.command_id = cmdid;
 585         cmnd->common.nsid = cpu_to_le32(ns->ns_id);
 586
 587         if (++nvmeq->sq_tail == nvmeq->q_depth)
 588                 nvmeq->sq_tail = 0;
 589         writel(nvmeq->sq_tail, nvmeq->q_db);
 590
 591         return 0;
 592 }
 593
 594 int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns)
 595 {
 596         int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH,
 597                                         special_completion, NVME_IO_TIMEOUT);
 598         if (unlikely(cmdid < 0))
 599                 return cmdid;
 600
 601         return nvme_submit_flush(nvmeq, ns, cmdid);
 602 }
 603
 604 /*
 605  * Called with local interrupts disabled and the q_lock held.  May not sleep.
 606  */
 607 static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 608                                                                 struct bio *bio)
 609 {
 610         struct nvme_command *cmnd;
 611         struct nvme_iod *iod;
 612         enum dma_data_direction dma_dir;
 613         int cmdid, length, result;
 614         u16 control;
 615         u32 dsmgmt;
 616         int psegs = bio_phys_segments(ns->queue, bio);
 617
 618         if ((bio->bi_rw & REQ_FLUSH) && psegs) {
 619                 result = nvme_submit_flush_data(nvmeq, ns);
 620                 if (result)
 621                         return result;
 622         }
 623
 624         result = -ENOMEM;
 625         iod = nvme_alloc_iod(psegs, bio->bi_iter.bi_size, GFP_ATOMIC);
 626         if (!iod)
 627                 goto nomem;
 628         iod->private = bio;
 629
 630         result = -EBUSY;
 631         cmdid = alloc_cmdid(nvmeq, iod, bio_completion, NVME_IO_TIMEOUT);
 632         if (unlikely(cmdid < 0))
 633                 goto free_iod;
 634
 635         if (bio->bi_rw & REQ_DISCARD) {
 636                 result = nvme_submit_discard(nvmeq, ns, bio, iod, cmdid);
 637                 if (result)
 638                         goto free_cmdid;
 639                 return result;
 640         }
 641         if ((bio->bi_rw & REQ_FLUSH) && !psegs)
 642                 return nvme_submit_flush(nvmeq, ns, cmdid);
 643
 644         control = 0;
 645         if (bio->bi_rw & REQ_FUA)
 646                 control |= NVME_RW_FUA;
 647         if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD))
 648                 control |= NVME_RW_LR;
 649
 650         dsmgmt = 0;
 651         if (bio->bi_rw & REQ_RAHEAD)
 652                 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
 653
 654         cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
 655
 656         memset(cmnd, 0, sizeof(*cmnd));
 657         if (bio_data_dir(bio)) {
 658                 cmnd->rw.opcode = nvme_cmd_write;
 659                 dma_dir = DMA_TO_DEVICE;
 660         } else {
 661                 cmnd->rw.opcode = nvme_cmd_read;
 662                 dma_dir = DMA_FROM_DEVICE;
 663         }
 664
 665         result = nvme_map_bio(nvmeq, iod, bio, dma_dir, psegs);
 666         if (result <= 0)
 667                 goto free_cmdid;
 668         length = result;
 669
 670         cmnd->rw.command_id = cmdid;
 671         cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
 672         length = nvme_setup_prps(nvmeq->dev, &cmnd->common, iod, length,
 673                                                                 GFP_ATOMIC);
 674         cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_iter.bi_sector));
 675         cmnd->rw.length = cpu_to_le16((length >> ns->lba_shift) - 1);
 676         cmnd->rw.control = cpu_to_le16(control);
 677         cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
 678
 679         nvme_start_io_acct(bio);
 680         if (++nvmeq->sq_tail == nvmeq->q_depth)
 681                 nvmeq->sq_tail = 0;
 682         writel(nvmeq->sq_tail, nvmeq->q_db);
 683
 684         return 0;
 685
 686  free_cmdid:
 687         free_cmdid(nvmeq, cmdid, NULL);
 688  free_iod:
 689         nvme_free_iod(nvmeq->dev, iod);
 690  nomem:
 691         return result;
 692 }
 693
 694 static int nvme_process_cq(struct nvme_queue *nvmeq)
 695 {
 696         u16 head, phase;
 697
 698         head = nvmeq->cq_head;
 699         phase = nvmeq->cq_phase;
 700
 701         for (;;) {
 702                 void *ctx;
 703                 nvme_completion_fn fn;
 704                 struct nvme_completion cqe = nvmeq->cqes[head];
 705                 if ((le16_to_cpu(cqe.status) & 1) != phase)
 706                         break;
 707                 nvmeq->sq_head = le16_to_cpu(cqe.sq_head);
 708                 if (++head == nvmeq->q_depth) {
 709                         head = 0;
 710                         phase = !phase;
 711                 }
 712
 713                 ctx = free_cmdid(nvmeq, cqe.command_id, &fn);
 714                 fn(nvmeq->dev, ctx, &cqe);
 715         }
 716
 717         /* If the controller ignores the cq head doorbell and continuously
 718          * writes to the queue, it is theoretically possible to wrap around
 719          * the queue twice and mistakenly return IRQ_NONE.  Linux only
 720          * requires that 0.1% of your interrupts are handled, so this isn't
 721          * a big problem.
 722          */
 723         if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
 724                 return 0;
 725
 726         writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
 727         nvmeq->cq_head = head;
 728         nvmeq->cq_phase = phase;
 729
 730         nvmeq->cqe_seen = 1;
 731         return 1;
 732 }
 733
 734 static void nvme_make_request(struct request_queue *q, struct bio *bio)
 735 {
 736         struct nvme_ns *ns = q->queuedata;
 737         struct nvme_queue *nvmeq = get_nvmeq(ns->dev);
 738         int result = -EBUSY;
 739
 740         if (!nvmeq) {
 741                 put_nvmeq(NULL);
 742                 bio_endio(bio, -EIO);
 743                 return;
 744         }
 745
 746         spin_lock_irq(&nvmeq->q_lock);
 747         if (!nvmeq->q_suspended && bio_list_empty(&nvmeq->sq_cong))
 748                 result = nvme_submit_bio_queue(nvmeq, ns, bio);
 749         if (unlikely(result)) {
 750                 if (bio_list_empty(&nvmeq->sq_cong))
 751                         add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
 752                 bio_list_add(&nvmeq->sq_cong, bio);
 753         }
 754
 755         nvme_process_cq(nvmeq);
 756         spin_unlock_irq(&nvmeq->q_lock);
 757         put_nvmeq(nvmeq);
 758 }
 759
 760 static irqreturn_t nvme_irq(int irq, void *data)
 761 {
 762         irqreturn_t result;
 763         struct nvme_queue *nvmeq = data;
 764         spin_lock(&nvmeq->q_lock);
 765         nvme_process_cq(nvmeq);
 766         result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
 767         nvmeq->cqe_seen = 0;
 768         spin_unlock(&nvmeq->q_lock);
 769         return result;
 770 }
 771
 772 static irqreturn_t nvme_irq_check(int irq, void *data)
 773 {
 774         struct nvme_queue *nvmeq = data;
 775         struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head];
 776         if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase)
 777                 return IRQ_NONE;
 778         return IRQ_WAKE_THREAD;
 779 }
 780
 781 static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid)
 782 {
 783         spin_lock_irq(&nvmeq->q_lock);
 784         cancel_cmdid(nvmeq, cmdid, NULL);
 785         spin_unlock_irq(&nvmeq->q_lock);
 786 }
 787
 788 struct sync_cmd_info {
 789         struct task_struct *task;
 790         u32 result;
 791         int status;
 792 };
 793
 794 static void sync_completion(struct nvme_dev *dev, void *ctx,
 795                                                 struct nvme_completion *cqe)
 796 {
 797         struct sync_cmd_info *cmdinfo = ctx;
 798         cmdinfo->result = le32_to_cpup(&cqe->result);
 799         cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
 800         wake_up_process(cmdinfo->task);
 801 }
 802
 803 /*
 804  * Returns 0 on success.  If the result is negative, it's a Linux error code;
 805  * if the result is positive, it's an NVM Express status code
 806  */
 807 int nvme_submit_sync_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
 808                                                 u32 *result, unsigned timeout)
 809 {
 810         int cmdid;
 811         struct sync_cmd_info cmdinfo;
 812
 813         cmdinfo.task = current;
 814         cmdinfo.status = -EINTR;
 815
 816         cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion,
 817                                                                 timeout);
 818         if (cmdid < 0)
 819                 return cmdid;
 820         cmd->common.command_id = cmdid;
 821
 822         set_current_state(TASK_KILLABLE);
 823         nvme_submit_cmd(nvmeq, cmd);
 824         schedule_timeout(timeout);
 825
 826         if (cmdinfo.status == -EINTR) {
 827                 nvme_abort_command(nvmeq, cmdid);
 828                 return -EINTR;
 829         }
 830
 831         if (result)
 832                 *result = cmdinfo.result;
 833
 834         return cmdinfo.status;
 835 }
 836
 837 static int nvme_submit_async_cmd(struct nvme_queue *nvmeq,
 838                         struct nvme_command *cmd,
 839                         struct async_cmd_info *cmdinfo, unsigned timeout)
 840 {
 841         int cmdid;
 842
 843         cmdid = alloc_cmdid_killable(nvmeq, cmdinfo, async_completion, timeout);
 844         if (cmdid < 0)
 845                 return cmdid;
 846         cmdinfo->status = -EINTR;
 847         cmd->common.command_id = cmdid;
 848         nvme_submit_cmd(nvmeq, cmd);
 849         return 0;
 850 }
 851
 852 int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
 853                                                                 u32 *result)
 854 {
 855         return nvme_submit_sync_cmd(dev->queues[0], cmd, result, ADMIN_TIMEOUT);
 856 }
 857
 858 static int nvme_submit_admin_cmd_async(struct nvme_dev *dev,
 859                 struct nvme_command *cmd, struct async_cmd_info *cmdinfo)
 860 {
 861         return nvme_submit_async_cmd(dev->queues[0], cmd, cmdinfo,
 862                                                                 ADMIN_TIMEOUT);
 863 }
 864
 865 static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
 866 {
 867         int status;
 868         struct nvme_command c;
 869
 870         memset(&c, 0, sizeof(c));
 871         c.delete_queue.opcode = opcode;
 872         c.delete_queue.qid = cpu_to_le16(id);
 873
 874         status = nvme_submit_admin_cmd(dev, &c, NULL);
 875         if (status)
 876                 return -EIO;
 877         return 0;
 878 }
 879
 880 static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
 881                                                 struct nvme_queue *nvmeq)
 882 {
 883         int status;
 884         struct nvme_command c;
 885         int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
 886
 887         memset(&c, 0, sizeof(c));
 888         c.create_cq.opcode = nvme_admin_create_cq;
 889         c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
 890         c.create_cq.cqid = cpu_to_le16(qid);
 891         c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
 892         c.create_cq.cq_flags = cpu_to_le16(flags);
 893         c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
 894
 895         status = nvme_submit_admin_cmd(dev, &c, NULL);
 896         if (status)
 897                 return -EIO;
 898         return 0;
 899 }
 900
 901 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
 902                                                 struct nvme_queue *nvmeq)
 903 {
 904         int status;
 905         struct nvme_command c;
 906         int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
 907
 908         memset(&c, 0, sizeof(c));
 909         c.create_sq.opcode = nvme_admin_create_sq;
 910         c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
 911         c.create_sq.sqid = cpu_to_le16(qid);
 912         c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
 913         c.create_sq.sq_flags = cpu_to_le16(flags);
 914         c.create_sq.cqid = cpu_to_le16(qid);
 915
 916         status = nvme_submit_admin_cmd(dev, &c, NULL);
 917         if (status)
 918                 return -EIO;
 919         return 0;
 920 }
 921
 922 static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid)
 923 {
 924         return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
 925 }
 926
 927 static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
 928 {
 929         return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
 930 }
 931
 932 int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns,
 933                                                         dma_addr_t dma_addr)
 934 {
 935         struct nvme_command c;
 936
 937         memset(&c, 0, sizeof(c));
 938         c.identify.opcode = nvme_admin_identify;
 939         c.identify.nsid = cpu_to_le32(nsid);
 940         c.identify.prp1 = cpu_to_le64(dma_addr);
 941         c.identify.cns = cpu_to_le32(cns);
 942
 943         return nvme_submit_admin_cmd(dev, &c, NULL);
 944 }
 945
 946 int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
 947                                         dma_addr_t dma_addr, u32 *result)
 948 {
 949         struct nvme_command c;
 950
 951         memset(&c, 0, sizeof(c));
 952         c.features.opcode = nvme_admin_get_features;
 953         c.features.nsid = cpu_to_le32(nsid);
 954         c.features.prp1 = cpu_to_le64(dma_addr);
 955         c.features.fid = cpu_to_le32(fid);
 956
 957         return nvme_submit_admin_cmd(dev, &c, result);
 958 }
 959
 960 int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
 961                                         dma_addr_t dma_addr, u32 *result)
 962 {
 963         struct nvme_command c;
 964
 965         memset(&c, 0, sizeof(c));
 966         c.features.opcode = nvme_admin_set_features;
 967         c.features.prp1 = cpu_to_le64(dma_addr);
 968         c.features.fid = cpu_to_le32(fid);
 969         c.features.dword11 = cpu_to_le32(dword11);
 970
 971         return nvme_submit_admin_cmd(dev, &c, result);
 972 }
 973
 974 /**
 975  * nvme_abort_cmd - Attempt aborting a command
 976  * @cmdid: Command id of a timed out IO
 977  * @queue: The queue with timed out IO
 978  *
 979  * Schedule controller reset if the command was already aborted once before and
 980  * still hasn't been returned to the driver, or if this is the admin queue.
 981  */
 982 static void nvme_abort_cmd(int cmdid, struct nvme_queue *nvmeq)
 983 {
 984         int a_cmdid;
 985         struct nvme_command cmd;
 986         struct nvme_dev *dev = nvmeq->dev;
 987         struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
 988
 989         if (!nvmeq->qid || info[cmdid].aborted) {
 990                 if (work_busy(&dev->reset_work))
 991                         return;
 992                 list_del_init(&dev->node);
 993                 dev_warn(&dev->pci_dev->dev,
 994                         "I/O %d QID %d timeout, reset controller\n", cmdid,
 995                                                                 nvmeq->qid);
 996                 dev->reset_workfn = nvme_reset_failed_dev;
 997                 queue_work(nvme_workq, &dev->reset_work);
 998                 return;
 999         }
1000
1001         if (!dev->abort_limit)
1002                 return;
1003
1004         a_cmdid = alloc_cmdid(dev->queues[0], CMD_CTX_ABORT, special_completion,
1005                                                                 ADMIN_TIMEOUT);
1006         if (a_cmdid < 0)
1007                 return;
1008
1009         memset(&cmd, 0, sizeof(cmd));
1010         cmd.abort.opcode = nvme_admin_abort_cmd;
1011         cmd.abort.cid = cmdid;
1012         cmd.abort.sqid = cpu_to_le16(nvmeq->qid);
1013         cmd.abort.command_id = a_cmdid;
1014
1015         --dev->abort_limit;
1016         info[cmdid].aborted = 1;
1017         info[cmdid].timeout = jiffies + ADMIN_TIMEOUT;
1018
1019         dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", cmdid,
1020                                                         nvmeq->qid);
1021         nvme_submit_cmd(dev->queues[0], &cmd);
1022 }
1023
1024 /**
1025  * nvme_cancel_ios - Cancel outstanding I/Os
1026  * @queue: The queue to cancel I/Os on
1027  * @timeout: True to only cancel I/Os which have timed out
1028  */
1029 static void nvme_cancel_ios(struct nvme_queue *nvmeq, bool timeout)
1030 {
1031         int depth = nvmeq->q_depth - 1;
1032         struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
1033         unsigned long now = jiffies;
1034         int cmdid;
1035
1036         for_each_set_bit(cmdid, nvmeq->cmdid_data, depth) {
1037                 void *ctx;
1038                 nvme_completion_fn fn;
1039                 static struct nvme_completion cqe = {
1040                         .status = cpu_to_le16(NVME_SC_ABORT_REQ << 1),
1041                 };
1042
1043                 if (timeout && !time_after(now, info[cmdid].timeout))
1044                         continue;
1045                 if (info[cmdid].ctx == CMD_CTX_CANCELLED)
1046                         continue;
1047                 if (timeout && nvmeq->dev->initialized) {
1048                         nvme_abort_cmd(cmdid, nvmeq);
1049                         continue;
1050                 }
1051                 dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", cmdid,
1052                                                                 nvmeq->qid);
1053                 ctx = cancel_cmdid(nvmeq, cmdid, &fn);
1054                 fn(nvmeq->dev, ctx, &cqe);
1055         }
1056 }
1057
1058 static void nvme_free_queue(struct nvme_queue *nvmeq)
1059 {
1060         spin_lock_irq(&nvmeq->q_lock);
1061         while (bio_list_peek(&nvmeq->sq_cong)) {
1062                 struct bio *bio = bio_list_pop(&nvmeq->sq_cong);
1063                 bio_endio(bio, -EIO);
1064         }
1065         spin_unlock_irq(&nvmeq->q_lock);
1066
1067         dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
1068                                 (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
1069         dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
1070                                         nvmeq->sq_cmds, nvmeq->sq_dma_addr);
1071         kfree(nvmeq);
1072 }
1073
1074 static void nvme_free_queues(struct nvme_dev *dev, int lowest)
1075 {
1076         int i;
1077
1078         for (i = dev->queue_count - 1; i >= lowest; i--) {
1079                 nvme_free_queue(dev->queues[i]);
1080                 dev->queue_count--;
1081                 dev->queues[i] = NULL;
1082         }
1083 }
1084
1085 /**
1086  * nvme_suspend_queue - put queue into suspended state
1087  * @nvmeq - queue to suspend
1088  *
1089  * Returns 1 if already suspended, 0 otherwise.
1090  */
1091 static int nvme_suspend_queue(struct nvme_queue *nvmeq)
1092 {
1093         int vector = nvmeq->dev->entry[nvmeq->cq_vector].vector;
1094
1095         spin_lock_irq(&nvmeq->q_lock);
1096         if (nvmeq->q_suspended) {
1097                 spin_unlock_irq(&nvmeq->q_lock);
1098                 return 1;
1099         }
1100         nvmeq->q_suspended = 1;
1101         spin_unlock_irq(&nvmeq->q_lock);
1102
1103         irq_set_affinity_hint(vector, NULL);
1104         free_irq(vector, nvmeq);
1105
1106         return 0;
1107 }
1108
1109 static void nvme_clear_queue(struct nvme_queue *nvmeq)
1110 {
1111         spin_lock_irq(&nvmeq->q_lock);
1112         nvme_process_cq(nvmeq);
1113         nvme_cancel_ios(nvmeq, false);
1114         spin_unlock_irq(&nvmeq->q_lock);
1115 }
1116
1117 static void nvme_disable_queue(struct nvme_dev *dev, int qid)
1118 {
1119         struct nvme_queue *nvmeq = dev->queues[qid];
1120
1121         if (!nvmeq)
1122                 return;
1123         if (nvme_suspend_queue(nvmeq))
1124                 return;
1125
1126         /* Don't tell the adapter to delete the admin queue.
1127          * Don't tell a removed adapter to delete IO queues. */
1128         if (qid && readl(&dev->bar->csts) != -1) {
1129                 adapter_delete_sq(dev, qid);
1130                 adapter_delete_cq(dev, qid);
1131         }
1132         nvme_clear_queue(nvmeq);
1133 }
1134
1135 static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
1136                                                         int depth, int vector)
1137 {
1138         struct device *dmadev = &dev->pci_dev->dev;
1139         unsigned extra = nvme_queue_extra(depth);
1140         struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL);
1141         if (!nvmeq)
1142                 return NULL;
1143
1144         nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth),
1145                                         &nvmeq->cq_dma_addr, GFP_KERNEL);
1146         if (!nvmeq->cqes)
1147                 goto free_nvmeq;
1148         memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth));
1149
1150         nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth),
1151                                         &nvmeq->sq_dma_addr, GFP_KERNEL);
1152         if (!nvmeq->sq_cmds)
1153                 goto free_cqdma;
1154
1155         nvmeq->q_dmadev = dmadev;
1156         nvmeq->dev = dev;
1157         snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d",
1158                         dev->instance, qid);
1159         spin_lock_init(&nvmeq->q_lock);
1160         nvmeq->cq_head = 0;
1161         nvmeq->cq_phase = 1;
1162         init_waitqueue_head(&nvmeq->sq_full);
1163         init_waitqueue_entry(&nvmeq->sq_cong_wait, nvme_thread);
1164         bio_list_init(&nvmeq->sq_cong);
1165         nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1166         nvmeq->q_depth = depth;
1167         nvmeq->cq_vector = vector;
1168         nvmeq->qid = qid;
1169         nvmeq->q_suspended = 1;
1170         dev->queue_count++;
1171
1172         return nvmeq;
1173
1174  free_cqdma:
1175         dma_free_coherent(dmadev, CQ_SIZE(depth), (void *)nvmeq->cqes,
1176                                                         nvmeq->cq_dma_addr);
1177  free_nvmeq:
1178         kfree(nvmeq);
1179         return NULL;
1180 }
1181
1182 static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq,
1183                                                         const char *name)
1184 {
1185         if (use_threaded_interrupts)
1186                 return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector,
1187                                         nvme_irq_check, nvme_irq, IRQF_SHARED,
1188                                         name, nvmeq);
1189         return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq,
1190                                 IRQF_SHARED, name, nvmeq);
1191 }
1192
1193 static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
1194 {
1195         struct nvme_dev *dev = nvmeq->dev;
1196         unsigned extra = nvme_queue_extra(nvmeq->q_depth);
1197
1198         nvmeq->sq_tail = 0;
1199         nvmeq->cq_head = 0;
1200         nvmeq->cq_phase = 1;
1201         nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1202         memset(nvmeq->cmdid_data, 0, extra);
1203         memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
1204         nvme_cancel_ios(nvmeq, false);
1205         nvmeq->q_suspended = 0;
1206 }
1207
1208 static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
1209 {
1210         struct nvme_dev *dev = nvmeq->dev;
1211         int result;
1212
1213         result = adapter_alloc_cq(dev, qid, nvmeq);
1214         if (result < 0)
1215                 return result;
1216
1217         result = adapter_alloc_sq(dev, qid, nvmeq);
1218         if (result < 0)
1219                 goto release_cq;
1220
1221         result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
1222         if (result < 0)
1223                 goto release_sq;
1224
1225         spin_lock_irq(&nvmeq->q_lock);
1226         nvme_init_queue(nvmeq, qid);
1227         spin_unlock_irq(&nvmeq->q_lock);
1228
1229         return result;
1230
1231  release_sq:
1232         adapter_delete_sq(dev, qid);
1233  release_cq:
1234         adapter_delete_cq(dev, qid);
1235         return result;
1236 }
1237
1238 static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
1239 {
1240         unsigned long timeout;
1241         u32 bit = enabled ? NVME_CSTS_RDY : 0;
1242
1243         timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1244
1245         while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) {
1246                 msleep(100);
1247                 if (fatal_signal_pending(current))
1248                         return -EINTR;
1249                 if (time_after(jiffies, timeout)) {
1250                         dev_err(&dev->pci_dev->dev,
1251                                 "Device not ready; aborting initialisation\n");
1252                         return -ENODEV;
1253                 }
1254         }
1255
1256         return 0;
1257 }
1258
1259 /*
1260  * If the device has been passed off to us in an enabled state, just clear
1261  * the enabled bit.  The spec says we should set the 'shutdown notification
1262  * bits', but doing so may cause the device to complete commands to the
1263  * admin queue ... and we don't know what memory that might be pointing at!
1264  */
1265 static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap)
1266 {
1267         u32 cc = readl(&dev->bar->cc);
1268
1269         if (cc & NVME_CC_ENABLE)
1270                 writel(cc & ~NVME_CC_ENABLE, &dev->bar->cc);
1271         return nvme_wait_ready(dev, cap, false);
1272 }
1273
1274 static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap)
1275 {
1276         return nvme_wait_ready(dev, cap, true);
1277 }
1278
1279 static int nvme_shutdown_ctrl(struct nvme_dev *dev)
1280 {
1281         unsigned long timeout;
1282         u32 cc;
1283
1284         cc = (readl(&dev->bar->cc) & ~NVME_CC_SHN_MASK) | NVME_CC_SHN_NORMAL;
1285         writel(cc, &dev->bar->cc);
1286
1287         timeout = 2 * HZ + jiffies;
1288         while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) !=
1289                                                         NVME_CSTS_SHST_CMPLT) {
1290                 msleep(100);
1291                 if (fatal_signal_pending(current))
1292                         return -EINTR;
1293                 if (time_after(jiffies, timeout)) {
1294                         dev_err(&dev->pci_dev->dev,
1295                                 "Device shutdown incomplete; abort shutdown\n");
1296                         return -ENODEV;
1297                 }
1298         }
1299
1300         return 0;
1301 }
1302
1303 static int nvme_configure_admin_queue(struct nvme_dev *dev)
1304 {
1305         int result;
1306         u32 aqa;
1307         u64 cap = readq(&dev->bar->cap);
1308         struct nvme_queue *nvmeq;
1309
1310         result = nvme_disable_ctrl(dev, cap);
1311         if (result < 0)
1312                 return result;
1313
1314         nvmeq = dev->queues[0];
1315         if (!nvmeq) {
1316                 nvmeq = nvme_alloc_queue(dev, 0, 64, 0);
1317                 if (!nvmeq)
1318                         return -ENOMEM;
1319                 dev->queues[0] = nvmeq;
1320         }
1321
1322         aqa = nvmeq->q_depth - 1;
1323         aqa |= aqa << 16;
1324
1325         dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM;
1326         dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT;
1327         dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
1328         dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1329
1330         writel(aqa, &dev->bar->aqa);
1331         writeq(nvmeq->sq_dma_addr, &dev->bar->asq);
1332         writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
1333         writel(dev->ctrl_config, &dev->bar->cc);
1334
1335         result = nvme_enable_ctrl(dev, cap);
1336         if (result)
1337                 return result;
1338
1339         result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
1340         if (result)
1341                 return result;
1342
1343         spin_lock_irq(&nvmeq->q_lock);
1344         nvme_init_queue(nvmeq, 0);
1345         spin_unlock_irq(&nvmeq->q_lock);
1346         return result;
1347 }
1348
1349 struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
1350                                 unsigned long addr, unsigned length)
1351 {
1352         int i, err, count, nents, offset;
1353         struct scatterlist *sg;
1354         struct page **pages;
1355         struct nvme_iod *iod;
1356
1357         if (addr & 3)
1358                 return ERR_PTR(-EINVAL);
1359         if (!length || length > INT_MAX - PAGE_SIZE)
1360                 return ERR_PTR(-EINVAL);
1361
1362         offset = offset_in_page(addr);
1363         count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
1364         pages = kcalloc(count, sizeof(*pages), GFP_KERNEL);
1365         if (!pages)
1366                 return ERR_PTR(-ENOMEM);
1367
1368         err = get_user_pages_fast(addr, count, 1, pages);
1369         if (err < count) {
1370                 count = err;
1371                 err = -EFAULT;
1372                 goto put_pages;
1373         }
1374
1375         iod = nvme_alloc_iod(count, length, GFP_KERNEL);
1376         sg = iod->sg;
1377         sg_init_table(sg, count);
1378         for (i = 0; i < count; i++) {
1379                 sg_set_page(&sg[i], pages[i],
1380                             min_t(unsigned, length, PAGE_SIZE - offset),
1381                             offset);
1382                 length -= (PAGE_SIZE - offset);
1383                 offset = 0;
1384         }
1385         sg_mark_end(&sg[i - 1]);
1386         iod->nents = count;
1387
1388         err = -ENOMEM;
1389         nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
1390                                 write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1391         if (!nents)
1392                 goto free_iod;
1393
1394         kfree(pages);
1395         return iod;
1396
1397  free_iod:
1398         kfree(iod);
1399  put_pages:
1400         for (i = 0; i < count; i++)
1401                 put_page(pages[i]);
1402         kfree(pages);
1403         return ERR_PTR(err);
1404 }
1405
1406 void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
1407                         struct nvme_iod *iod)
1408 {
1409         int i;
1410
1411         dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
1412                                 write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1413
1414         for (i = 0; i < iod->nents; i++)
1415                 put_page(sg_page(&iod->sg[i]));
1416 }
1417
1418 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1419 {
1420         struct nvme_dev *dev = ns->dev;
1421         struct nvme_queue *nvmeq;
1422         struct nvme_user_io io;
1423         struct nvme_command c;
1424         unsigned length, meta_len;
1425         int status, i;
1426         struct nvme_iod *iod, *meta_iod = NULL;
1427         dma_addr_t meta_dma_addr;
1428         void *meta, *uninitialized_var(meta_mem);
1429
1430         if (copy_from_user(&io, uio, sizeof(io)))
1431                 return -EFAULT;
1432         length = (io.nblocks + 1) << ns->lba_shift;
1433         meta_len = (io.nblocks + 1) * ns->ms;
1434
1435         if (meta_len && ((io.metadata & 3) || !io.metadata))
1436                 return -EINVAL;
1437
1438         switch (io.opcode) {
1439         case nvme_cmd_write:
1440         case nvme_cmd_read:
1441         case nvme_cmd_compare:
1442                 iod = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length);
1443                 break;
1444         default:
1445                 return -EINVAL;
1446         }
1447
1448         if (IS_ERR(iod))
1449                 return PTR_ERR(iod);
1450
1451         memset(&c, 0, sizeof(c));
1452         c.rw.opcode = io.opcode;
1453         c.rw.flags = io.flags;
1454         c.rw.nsid = cpu_to_le32(ns->ns_id);
1455         c.rw.slba = cpu_to_le64(io.slba);
1456         c.rw.length = cpu_to_le16(io.nblocks);
1457         c.rw.control = cpu_to_le16(io.control);
1458         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1459         c.rw.reftag = cpu_to_le32(io.reftag);
1460         c.rw.apptag = cpu_to_le16(io.apptag);
1461         c.rw.appmask = cpu_to_le16(io.appmask);
1462
1463         if (meta_len) {
1464                 meta_iod = nvme_map_user_pages(dev, io.opcode & 1, io.metadata,
1465                                                                 meta_len);
1466                 if (IS_ERR(meta_iod)) {
1467                         status = PTR_ERR(meta_iod);
1468                         meta_iod = NULL;
1469                         goto unmap;
1470                 }
1471
1472                 meta_mem = dma_alloc_coherent(&dev->pci_dev->dev, meta_len,
1473                                                 &meta_dma_addr, GFP_KERNEL);
1474                 if (!meta_mem) {
1475                         status = -ENOMEM;
1476                         goto unmap;
1477                 }
1478
1479                 if (io.opcode & 1) {
1480                         int meta_offset = 0;
1481
1482                         for (i = 0; i < meta_iod->nents; i++) {
1483                                 meta = kmap_atomic(sg_page(&meta_iod->sg[i])) +
1484                                                 meta_iod->sg[i].offset;
1485                                 memcpy(meta_mem + meta_offset, meta,
1486                                                 meta_iod->sg[i].length);
1487                                 kunmap_atomic(meta);
1488                                 meta_offset += meta_iod->sg[i].length;
1489                         }
1490                 }
1491
1492                 c.rw.metadata = cpu_to_le64(meta_dma_addr);
1493         }
1494
1495         length = nvme_setup_prps(dev, &c.common, iod, length, GFP_KERNEL);
1496
1497         nvmeq = get_nvmeq(dev);
1498         /*
1499          * Since nvme_submit_sync_cmd sleeps, we can't keep preemption
1500          * disabled.  We may be preempted at any point, and be rescheduled
1501          * to a different CPU.  That will cause cacheline bouncing, but no
1502          * additional races since q_lock already protects against other CPUs.
1503          */
1504         put_nvmeq(nvmeq);
1505         if (length != (io.nblocks + 1) << ns->lba_shift)
1506                 status = -ENOMEM;
1507         else if (!nvmeq || nvmeq->q_suspended)
1508                 status = -EBUSY;
1509         else
1510                 status = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
1511
1512         if (meta_len) {
1513                 if (status == NVME_SC_SUCCESS && !(io.opcode & 1)) {
1514                         int meta_offset = 0;
1515
1516                         for (i = 0; i < meta_iod->nents; i++) {
1517                                 meta = kmap_atomic(sg_page(&meta_iod->sg[i])) +
1518                                                 meta_iod->sg[i].offset;
1519                                 memcpy(meta, meta_mem + meta_offset,
1520                                                 meta_iod->sg[i].length);
1521                                 kunmap_atomic(meta);
1522                                 meta_offset += meta_iod->sg[i].length;
1523                         }
1524                 }
1525
1526                 dma_free_coherent(&dev->pci_dev->dev, meta_len, meta_mem,
1527                                                                 meta_dma_addr);
1528         }
1529
1530  unmap:
1531         nvme_unmap_user_pages(dev, io.opcode & 1, iod);
1532         nvme_free_iod(dev, iod);
1533
1534         if (meta_iod) {
1535                 nvme_unmap_user_pages(dev, io.opcode & 1, meta_iod);
1536                 nvme_free_iod(dev, meta_iod);
1537         }
1538
1539         return status;
1540 }
1541
1542 static int nvme_user_admin_cmd(struct nvme_dev *dev,
1543                                         struct nvme_admin_cmd __user *ucmd)
1544 {
1545         struct nvme_admin_cmd cmd;
1546         struct nvme_command c;
1547         int status, length;
1548         struct nvme_iod *uninitialized_var(iod);
1549         unsigned timeout;
1550
1551         if (!capable(CAP_SYS_ADMIN))
1552                 return -EACCES;
1553         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1554                 return -EFAULT;
1555
1556         memset(&c, 0, sizeof(c));
1557         c.common.opcode = cmd.opcode;
1558         c.common.flags = cmd.flags;
1559         c.common.nsid = cpu_to_le32(cmd.nsid);
1560         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1561         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1562         c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
1563         c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
1564         c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
1565         c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
1566         c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
1567         c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
1568
1569         length = cmd.data_len;
1570         if (cmd.data_len) {
1571                 iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr,
1572                                                                 length);
1573                 if (IS_ERR(iod))
1574                         return PTR_ERR(iod);
1575                 length = nvme_setup_prps(dev, &c.common, iod, length,
1576                                                                 GFP_KERNEL);
1577         }
1578
1579         timeout = cmd.timeout_ms ? msecs_to_jiffies(cmd.timeout_ms) :
1580                                                                 ADMIN_TIMEOUT;
1581         if (length != cmd.data_len)
1582                 status = -ENOMEM;
1583         else
1584                 status = nvme_submit_sync_cmd(dev->queues[0], &c, &cmd.result,
1585                                                                 timeout);
1586
1587         if (cmd.data_len) {
1588                 nvme_unmap_user_pages(dev, cmd.opcode & 1, iod);
1589                 nvme_free_iod(dev, iod);
1590         }
1591
1592         if ((status >= 0) && copy_to_user(&ucmd->result, &cmd.result,
1593                                                         sizeof(cmd.result)))
1594                 status = -EFAULT;
1595
1596         return status;
1597 }
1598
1599 static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
1600                                                         unsigned long arg)
1601 {
1602         struct nvme_ns *ns = bdev->bd_disk->private_data;
1603
1604         switch (cmd) {
1605         case NVME_IOCTL_ID:
1606                 force_successful_syscall_return();
1607                 return ns->ns_id;
1608         case NVME_IOCTL_ADMIN_CMD:
1609                 return nvme_user_admin_cmd(ns->dev, (void __user *)arg);
1610         case NVME_IOCTL_SUBMIT_IO:
1611                 return nvme_submit_io(ns, (void __user *)arg);
1612         case SG_GET_VERSION_NUM:
1613                 return nvme_sg_get_version_num((void __user *)arg);
1614         case SG_IO:
1615                 return nvme_sg_io(ns, (void __user *)arg);
1616         default:
1617                 return -ENOTTY;
1618         }
1619 }
1620
1621 #ifdef CONFIG_COMPAT
1622 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
1623                                         unsigned int cmd, unsigned long arg)
1624 {
1625         struct nvme_ns *ns = bdev->bd_disk->private_data;
1626
1627         switch (cmd) {
1628         case SG_IO:
1629                 return nvme_sg_io32(ns, arg);
1630         }
1631         return nvme_ioctl(bdev, mode, cmd, arg);
1632 }
1633 #else
1634 #define nvme_compat_ioctl       NULL
1635 #endif
1636
1637 static int nvme_open(struct block_device *bdev, fmode_t mode)
1638 {
1639         struct nvme_ns *ns = bdev->bd_disk->private_data;
1640         struct nvme_dev *dev = ns->dev;
1641
1642         kref_get(&dev->kref);
1643         return 0;
1644 }
1645
1646 static void nvme_free_dev(struct kref *kref);
1647
1648 static void nvme_release(struct gendisk *disk, fmode_t mode)
1649 {
1650         struct nvme_ns *ns = disk->private_data;
1651         struct nvme_dev *dev = ns->dev;
1652
1653         kref_put(&dev->kref, nvme_free_dev);
1654 }
1655
1656 static const struct block_device_operations nvme_fops = {
1657         .owner          = THIS_MODULE,
1658         .ioctl          = nvme_ioctl,
1659         .compat_ioctl   = nvme_compat_ioctl,
1660         .open           = nvme_open,
1661         .release        = nvme_release,
1662 };
1663
1664 static void nvme_resubmit_bios(struct nvme_queue *nvmeq)
1665 {
1666         while (bio_list_peek(&nvmeq->sq_cong)) {
1667                 struct bio *bio = bio_list_pop(&nvmeq->sq_cong);
1668                 struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data;
1669
1670                 if (bio_list_empty(&nvmeq->sq_cong))
1671                         remove_wait_queue(&nvmeq->sq_full,
1672                                                         &nvmeq->sq_cong_wait);
1673                 if (nvme_submit_bio_queue(nvmeq, ns, bio)) {
1674                         if (bio_list_empty(&nvmeq->sq_cong))
1675                                 add_wait_queue(&nvmeq->sq_full,
1676                                                         &nvmeq->sq_cong_wait);
1677                         bio_list_add_head(&nvmeq->sq_cong, bio);
1678                         break;
1679                 }
1680         }
1681 }
1682
1683 static int nvme_kthread(void *data)
1684 {
1685         struct nvme_dev *dev, *next;
1686
1687         while (!kthread_should_stop()) {
1688                 set_current_state(TASK_INTERRUPTIBLE);
1689                 spin_lock(&dev_list_lock);
1690                 list_for_each_entry_safe(dev, next, &dev_list, node) {
1691                         int i;
1692                         if (readl(&dev->bar->csts) & NVME_CSTS_CFS &&
1693                                                         dev->initialized) {
1694                                 if (work_busy(&dev->reset_work))
1695                                         continue;
1696                                 list_del_init(&dev->node);
1697                                 dev_warn(&dev->pci_dev->dev,
1698                                         "Failed status, reset controller\n");
1699                                 dev->reset_workfn = nvme_reset_failed_dev;
1700                                 queue_work(nvme_workq, &dev->reset_work);
1701                                 continue;
1702                         }
1703                         for (i = 0; i < dev->queue_count; i++) {
1704                                 struct nvme_queue *nvmeq = dev->queues[i];
1705                                 if (!nvmeq)
1706                                         continue;
1707                                 spin_lock_irq(&nvmeq->q_lock);
1708                                 if (nvmeq->q_suspended)
1709                                         goto unlock;
1710                                 nvme_process_cq(nvmeq);
1711                                 nvme_cancel_ios(nvmeq, true);
1712                                 nvme_resubmit_bios(nvmeq);
1713  unlock:
1714                                 spin_unlock_irq(&nvmeq->q_lock);
1715                         }
1716                 }
1717                 spin_unlock(&dev_list_lock);
1718                 schedule_timeout(round_jiffies_relative(HZ));
1719         }
1720         return 0;
1721 }
1722
1723 static void nvme_config_discard(struct nvme_ns *ns)
1724 {
1725         u32 logical_block_size = queue_logical_block_size(ns->queue);
1726         ns->queue->limits.discard_zeroes_data = 0;
1727         ns->queue->limits.discard_alignment = logical_block_size;
1728         ns->queue->limits.discard_granularity = logical_block_size;
1729         ns->queue->limits.max_discard_sectors = 0xffffffff;
1730         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
1731 }
1732
1733 static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid,
1734                         struct nvme_id_ns *id, struct nvme_lba_range_type *rt)
1735 {
1736         struct nvme_ns *ns;
1737         struct gendisk *disk;
1738         int lbaf;
1739
1740         if (rt->attributes & NVME_LBART_ATTRIB_HIDE)
1741                 return NULL;
1742
1743         ns = kzalloc(sizeof(*ns), GFP_KERNEL);
1744         if (!ns)
1745                 return NULL;
1746         ns->queue = blk_alloc_queue(GFP_KERNEL);
1747         if (!ns->queue)
1748                 goto out_free_ns;
1749         ns->queue->queue_flags = QUEUE_FLAG_DEFAULT;
1750         queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
1751         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1752         blk_queue_make_request(ns->queue, nvme_make_request);
1753         ns->dev = dev;
1754         ns->queue->queuedata = ns;
1755
1756         disk = alloc_disk(0);
1757         if (!disk)
1758                 goto out_free_queue;
1759         ns->ns_id = nsid;
1760         ns->disk = disk;
1761         lbaf = id->flbas & 0xf;
1762         ns->lba_shift = id->lbaf[lbaf].ds;
1763         ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
1764         blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1765         if (dev->max_hw_sectors)
1766                 blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
1767
1768         disk->major = nvme_major;
1769         disk->first_minor = 0;
1770         disk->fops = &nvme_fops;
1771         disk->private_data = ns;
1772         disk->queue = ns->queue;
1773         disk->driverfs_dev = &dev->pci_dev->dev;
1774         disk->flags = GENHD_FL_EXT_DEVT;
1775         sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid);
1776         set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
1777
1778         if (dev->oncs & NVME_CTRL_ONCS_DSM)
1779                 nvme_config_discard(ns);
1780
1781         return ns;
1782
1783  out_free_queue:
1784         blk_cleanup_queue(ns->queue);
1785  out_free_ns:
1786         kfree(ns);
1787         return NULL;
1788 }
1789
1790 static int set_queue_count(struct nvme_dev *dev, int count)
1791 {
1792         int status;
1793         u32 result;
1794         u32 q_count = (count - 1) | ((count - 1) << 16);
1795
1796         status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0,
1797                                                                 &result);
1798         if (status)
1799                 return status < 0 ? -EIO : -EBUSY;
1800         return min(result & 0xffff, result >> 16) + 1;
1801 }
1802
1803 static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
1804 {
1805         return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
1806 }
1807
1808 static int nvme_setup_io_queues(struct nvme_dev *dev)
1809 {
1810         struct nvme_queue *adminq = dev->queues[0];
1811         struct pci_dev *pdev = dev->pci_dev;
1812         int result, cpu, i, vecs, nr_io_queues, size, q_depth;
1813
1814         nr_io_queues = num_online_cpus();
1815         result = set_queue_count(dev, nr_io_queues);
1816         if (result < 0)
1817                 return result;
1818         if (result < nr_io_queues)
1819                 nr_io_queues = result;
1820
1821         size = db_bar_size(dev, nr_io_queues);
1822         if (size > 8192) {
1823                 iounmap(dev->bar);
1824                 do {
1825                         dev->bar = ioremap(pci_resource_start(pdev, 0), size);
1826                         if (dev->bar)
1827                                 break;
1828                         if (!--nr_io_queues)
1829                                 return -ENOMEM;
1830                         size = db_bar_size(dev, nr_io_queues);
1831                 } while (1);
1832                 dev->dbs = ((void __iomem *)dev->bar) + 4096;
1833                 dev->queues[0]->q_db = dev->dbs;
1834         }
1835
1836         /* Deregister the admin queue's interrupt */
1837         free_irq(dev->entry[0].vector, adminq);
1838
1839         for (i = 0; i < nr_io_queues; i++)
1840                 dev->entry[i].entry = i;
1841         vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues);
1842         if (vecs < 0) {
1843                 vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32));
1844                 if (vecs < 0) {
1845                         vecs = 1;
1846                 } else {
1847                         for (i = 0; i < vecs; i++)
1848                                 dev->entry[i].vector = i + pdev->irq;
1849                 }
1850         }
1851
1852         /*
1853          * Should investigate if there's a performance win from allocating
1854          * more queues than interrupt vectors; it might allow the submission
1855          * path to scale better, even if the receive path is limited by the
1856          * number of interrupts.
1857          */
1858         nr_io_queues = vecs;
1859
1860         result = queue_request_irq(dev, adminq, adminq->irqname);
1861         if (result) {
1862                 adminq->q_suspended = 1;
1863                 goto free_queues;
1864         }
1865
1866         /* Free previously allocated queues that are no longer usable */
1867         spin_lock(&dev_list_lock);
1868         for (i = dev->queue_count - 1; i > nr_io_queues; i--) {
1869                 struct nvme_queue *nvmeq = dev->queues[i];
1870
1871                 spin_lock_irq(&nvmeq->q_lock);
1872                 nvme_cancel_ios(nvmeq, false);
1873                 spin_unlock_irq(&nvmeq->q_lock);
1874
1875                 nvme_free_queue(nvmeq);
1876                 dev->queue_count--;
1877                 dev->queues[i] = NULL;
1878         }
1879         spin_unlock(&dev_list_lock);
1880
1881         cpu = cpumask_first(cpu_online_mask);
1882         for (i = 0; i < nr_io_queues; i++) {
1883                 irq_set_affinity_hint(dev->entry[i].vector, get_cpu_mask(cpu));
1884                 cpu = cpumask_next(cpu, cpu_online_mask);
1885         }
1886
1887         q_depth = min_t(int, NVME_CAP_MQES(readq(&dev->bar->cap)) + 1,
1888                                                                 NVME_Q_DEPTH);
1889         for (i = dev->queue_count - 1; i < nr_io_queues; i++) {
1890                 dev->queues[i + 1] = nvme_alloc_queue(dev, i + 1, q_depth, i);
1891                 if (!dev->queues[i + 1]) {
1892                         result = -ENOMEM;
1893                         goto free_queues;
1894                 }
1895         }
1896
1897         for (; i < num_possible_cpus(); i++) {
1898                 int target = i % rounddown_pow_of_two(dev->queue_count - 1);
1899                 dev->queues[i + 1] = dev->queues[target + 1];
1900         }
1901
1902         for (i = 1; i < dev->queue_count; i++) {
1903                 result = nvme_create_queue(dev->queues[i], i);
1904                 if (result) {
1905                         for (--i; i > 0; i--)
1906                                 nvme_disable_queue(dev, i);
1907                         goto free_queues;
1908                 }
1909         }
1910
1911         return 0;
1912
1913  free_queues:
1914         nvme_free_queues(dev, 1);
1915         return result;
1916 }
1917
1918 /*
1919  * Return: error value if an error occurred setting up the queues or calling
1920  * Identify Device.  0 if these succeeded, even if adding some of the
1921  * namespaces failed.  At the moment, these failures are silent.  TBD which
1922  * failures should be reported.
1923  */
1924 static int nvme_dev_add(struct nvme_dev *dev)
1925 {
1926         struct pci_dev *pdev = dev->pci_dev;
1927         int res;
1928         unsigned nn, i;
1929         struct nvme_ns *ns;
1930         struct nvme_id_ctrl *ctrl;
1931         struct nvme_id_ns *id_ns;
1932         void *mem;
1933         dma_addr_t dma_addr;
1934         int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12;
1935
1936         mem = dma_alloc_coherent(&pdev->dev, 8192, &dma_addr, GFP_KERNEL);
1937         if (!mem)
1938                 return -ENOMEM;
1939
1940         res = nvme_identify(dev, 0, 1, dma_addr);
1941         if (res) {
1942                 res = -EIO;
1943                 goto out;
1944         }
1945
1946         ctrl = mem;
1947         nn = le32_to_cpup(&ctrl->nn);
1948         dev->oncs = le16_to_cpup(&ctrl->oncs);
1949         dev->abort_limit = ctrl->acl + 1;
1950         memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
1951         memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
1952         memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
1953         if (ctrl->mdts)
1954                 dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
1955         if ((pdev->vendor == PCI_VENDOR_ID_INTEL) &&
1956                         (pdev->device == 0x0953) && ctrl->vs[3])
1957                 dev->stripe_size = 1 << (ctrl->vs[3] + shift);
1958
1959         id_ns = mem;
1960         for (i = 1; i <= nn; i++) {
1961                 res = nvme_identify(dev, i, 0, dma_addr);
1962                 if (res)
1963                         continue;
1964
1965                 if (id_ns->ncap == 0)
1966                         continue;
1967
1968                 res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i,
1969                                                         dma_addr + 4096, NULL);
1970                 if (res)
1971                         memset(mem + 4096, 0, 4096);
1972
1973                 ns = nvme_alloc_ns(dev, i, mem, mem + 4096);
1974                 if (ns)
1975                         list_add_tail(&ns->list, &dev->namespaces);
1976         }
1977         list_for_each_entry(ns, &dev->namespaces, list)
1978                 add_disk(ns->disk);
1979         res = 0;
1980
1981  out:
1982         dma_free_coherent(&dev->pci_dev->dev, 8192, mem, dma_addr);
1983         return res;
1984 }
1985
1986 static int nvme_dev_map(struct nvme_dev *dev)
1987 {
1988         int bars, result = -ENOMEM;
1989         struct pci_dev *pdev = dev->pci_dev;
1990
1991         if (pci_enable_device_mem(pdev))
1992                 return result;
1993
1994         dev->entry[0].vector = pdev->irq;
1995         pci_set_master(pdev);
1996         bars = pci_select_bars(pdev, IORESOURCE_MEM);
1997         if (pci_request_selected_regions(pdev, bars, "nvme"))
1998                 goto disable_pci;
1999
2000         if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)) &&
2001             dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)))
2002                 goto disable;
2003
2004         dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
2005         if (!dev->bar)
2006                 goto disable;
2007         if (readl(&dev->bar->csts) == -1) {
2008                 result = -ENODEV;
2009                 goto unmap;
2010         }
2011         dev->db_stride = 1 << NVME_CAP_STRIDE(readq(&dev->bar->cap));
2012         dev->dbs = ((void __iomem *)dev->bar) + 4096;
2013
2014         return 0;
2015
2016  unmap:
2017         iounmap(dev->bar);
2018         dev->bar = NULL;
2019  disable:
2020         pci_release_regions(pdev);
2021  disable_pci:
2022         pci_disable_device(pdev);
2023         return result;
2024 }
2025
2026 static void nvme_dev_unmap(struct nvme_dev *dev)
2027 {
2028         if (dev->pci_dev->msi_enabled)
2029                 pci_disable_msi(dev->pci_dev);
2030         else if (dev->pci_dev->msix_enabled)
2031                 pci_disable_msix(dev->pci_dev);
2032
2033         if (dev->bar) {
2034                 iounmap(dev->bar);
2035                 dev->bar = NULL;
2036                 pci_release_regions(dev->pci_dev);
2037         }
2038
2039         if (pci_is_enabled(dev->pci_dev))
2040                 pci_disable_device(dev->pci_dev);
2041 }
2042
2043 struct nvme_delq_ctx {
2044         struct task_struct *waiter;
2045         struct kthread_worker *worker;
2046         atomic_t refcount;
2047 };
2048
2049 static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev)
2050 {
2051         dq->waiter = current;
2052         mb();
2053
2054         for (;;) {
2055                 set_current_state(TASK_KILLABLE);
2056                 if (!atomic_read(&dq->refcount))
2057                         break;
2058                 if (!schedule_timeout(ADMIN_TIMEOUT) ||
2059                                         fatal_signal_pending(current)) {
2060                         set_current_state(TASK_RUNNING);
2061
2062                         nvme_disable_ctrl(dev, readq(&dev->bar->cap));
2063                         nvme_disable_queue(dev, 0);
2064
2065                         send_sig(SIGKILL, dq->worker->task, 1);
2066                         flush_kthread_worker(dq->worker);
2067                         return;
2068                 }
2069         }
2070         set_current_state(TASK_RUNNING);
2071 }
2072
2073 static void nvme_put_dq(struct nvme_delq_ctx *dq)
2074 {
2075         atomic_dec(&dq->refcount);
2076         if (dq->waiter)
2077                 wake_up_process(dq->waiter);
2078 }
2079
2080 static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq)
2081 {
2082         atomic_inc(&dq->refcount);
2083         return dq;
2084 }
2085
2086 static void nvme_del_queue_end(struct nvme_queue *nvmeq)
2087 {
2088         struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx;
2089
2090         nvme_clear_queue(nvmeq);
2091         nvme_put_dq(dq);
2092 }
2093
2094 static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode,
2095                                                 kthread_work_func_t fn)
2096 {
2097         struct nvme_command c;
2098
2099         memset(&c, 0, sizeof(c));
2100         c.delete_queue.opcode = opcode;
2101         c.delete_queue.qid = cpu_to_le16(nvmeq->qid);
2102
2103         init_kthread_work(&nvmeq->cmdinfo.work, fn);
2104         return nvme_submit_admin_cmd_async(nvmeq->dev, &c, &nvmeq->cmdinfo);
2105 }
2106
2107 static void nvme_del_cq_work_handler(struct kthread_work *work)
2108 {
2109         struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2110                                                         cmdinfo.work);
2111         nvme_del_queue_end(nvmeq);
2112 }
2113
2114 static int nvme_delete_cq(struct nvme_queue *nvmeq)
2115 {
2116         return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq,
2117                                                 nvme_del_cq_work_handler);
2118 }
2119
2120 static void nvme_del_sq_work_handler(struct kthread_work *work)
2121 {
2122         struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2123                                                         cmdinfo.work);
2124         int status = nvmeq->cmdinfo.status;
2125
2126         if (!status)
2127                 status = nvme_delete_cq(nvmeq);
2128         if (status)
2129                 nvme_del_queue_end(nvmeq);
2130 }
2131
2132 static int nvme_delete_sq(struct nvme_queue *nvmeq)
2133 {
2134         return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq,
2135                                                 nvme_del_sq_work_handler);
2136 }
2137
2138 static void nvme_del_queue_start(struct kthread_work *work)
2139 {
2140         struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2141                                                         cmdinfo.work);
2142         allow_signal(SIGKILL);
2143         if (nvme_delete_sq(nvmeq))
2144                 nvme_del_queue_end(nvmeq);
2145 }
2146
2147 static void nvme_disable_io_queues(struct nvme_dev *dev)
2148 {
2149         int i;
2150         DEFINE_KTHREAD_WORKER_ONSTACK(worker);
2151         struct nvme_delq_ctx dq;
2152         struct task_struct *kworker_task = kthread_run(kthread_worker_fn,
2153                                         &worker, "nvme%d", dev->instance);
2154
2155         if (IS_ERR(kworker_task)) {
2156                 dev_err(&dev->pci_dev->dev,
2157                         "Failed to create queue del task\n");
2158                 for (i = dev->queue_count - 1; i > 0; i--)
2159                         nvme_disable_queue(dev, i);
2160                 return;
2161         }
2162
2163         dq.waiter = NULL;
2164         atomic_set(&dq.refcount, 0);
2165         dq.worker = &worker;
2166         for (i = dev->queue_count - 1; i > 0; i--) {
2167                 struct nvme_queue *nvmeq = dev->queues[i];
2168
2169                 if (nvme_suspend_queue(nvmeq))
2170                         continue;
2171                 nvmeq->cmdinfo.ctx = nvme_get_dq(&dq);
2172                 nvmeq->cmdinfo.worker = dq.worker;
2173                 init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start);
2174                 queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work);
2175         }
2176         nvme_wait_dq(&dq, dev);
2177         kthread_stop(kworker_task);
2178 }
2179
2180 static void nvme_dev_shutdown(struct nvme_dev *dev)
2181 {
2182         int i;
2183
2184         dev->initialized = 0;
2185
2186         spin_lock(&dev_list_lock);
2187         list_del_init(&dev->node);
2188         spin_unlock(&dev_list_lock);
2189
2190         if (!dev->bar || (dev->bar && readl(&dev->bar->csts) == -1)) {
2191                 for (i = dev->queue_count - 1; i >= 0; i--) {
2192                         struct nvme_queue *nvmeq = dev->queues[i];
2193                         nvme_suspend_queue(nvmeq);
2194                         nvme_clear_queue(nvmeq);
2195                 }
2196         } else {
2197                 nvme_disable_io_queues(dev);
2198                 nvme_shutdown_ctrl(dev);
2199                 nvme_disable_queue(dev, 0);
2200         }
2201         nvme_dev_unmap(dev);
2202 }
2203
2204 static void nvme_dev_remove(struct nvme_dev *dev)
2205 {
2206         struct nvme_ns *ns;
2207
2208         list_for_each_entry(ns, &dev->namespaces, list) {
2209                 if (ns->disk->flags & GENHD_FL_UP)
2210                         del_gendisk(ns->disk);
2211                 if (!blk_queue_dying(ns->queue))
2212                         blk_cleanup_queue(ns->queue);
2213         }
2214 }
2215
2216 static int nvme_setup_prp_pools(struct nvme_dev *dev)
2217 {
2218         struct device *dmadev = &dev->pci_dev->dev;
2219         dev->prp_page_pool = dma_pool_create("prp list page", dmadev,
2220                                                 PAGE_SIZE, PAGE_SIZE, 0);
2221         if (!dev->prp_page_pool)
2222                 return -ENOMEM;
2223
2224         /* Optimisation for I/Os between 4k and 128k */
2225         dev->prp_small_pool = dma_pool_create("prp list 256", dmadev,
2226                                                 256, 256, 0);
2227         if (!dev->prp_small_pool) {
2228                 dma_pool_destroy(dev->prp_page_pool);
2229                 return -ENOMEM;
2230         }
2231         return 0;
2232 }
2233
2234 static void nvme_release_prp_pools(struct nvme_dev *dev)
2235 {
2236         dma_pool_destroy(dev->prp_page_pool);
2237         dma_pool_destroy(dev->prp_small_pool);
2238 }
2239
2240 static DEFINE_IDA(nvme_instance_ida);
2241
2242 static int nvme_set_instance(struct nvme_dev *dev)
2243 {
2244         int instance, error;
2245
2246         do {
2247                 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
2248                         return -ENODEV;
2249
2250                 spin_lock(&dev_list_lock);
2251                 error = ida_get_new(&nvme_instance_ida, &instance);
2252                 spin_unlock(&dev_list_lock);
2253         } while (error == -EAGAIN);
2254
2255         if (error)
2256                 return -ENODEV;
2257
2258         dev->instance = instance;
2259         return 0;
2260 }
2261
2262 static void nvme_release_instance(struct nvme_dev *dev)
2263 {
2264         spin_lock(&dev_list_lock);
2265         ida_remove(&nvme_instance_ida, dev->instance);
2266         spin_unlock(&dev_list_lock);
2267 }
2268
2269 static void nvme_free_namespaces(struct nvme_dev *dev)
2270 {
2271         struct nvme_ns *ns, *next;
2272
2273         list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
2274                 list_del(&ns->list);
2275                 put_disk(ns->disk);
2276                 kfree(ns);
2277         }
2278 }
2279
2280 static void nvme_free_dev(struct kref *kref)
2281 {
2282         struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref);
2283
2284         nvme_free_namespaces(dev);
2285         kfree(dev->queues);
2286         kfree(dev->entry);
2287         kfree(dev);
2288 }
2289
2290 static int nvme_dev_open(struct inode *inode, struct file *f)
2291 {
2292         struct nvme_dev *dev = container_of(f->private_data, struct nvme_dev,
2293                                                                 miscdev);
2294         kref_get(&dev->kref);
2295         f->private_data = dev;
2296         return 0;
2297 }
2298
2299 static int nvme_dev_release(struct inode *inode, struct file *f)
2300 {
2301         struct nvme_dev *dev = f->private_data;
2302         kref_put(&dev->kref, nvme_free_dev);
2303         return 0;
2304 }
2305
2306 static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
2307 {
2308         struct nvme_dev *dev = f->private_data;
2309         switch (cmd) {
2310         case NVME_IOCTL_ADMIN_CMD:
2311                 return nvme_user_admin_cmd(dev, (void __user *)arg);
2312         default:
2313                 return -ENOTTY;
2314         }
2315 }
2316
2317 static const struct file_operations nvme_dev_fops = {
2318         .owner          = THIS_MODULE,
2319         .open           = nvme_dev_open,
2320         .release        = nvme_dev_release,
2321         .unlocked_ioctl = nvme_dev_ioctl,
2322         .compat_ioctl   = nvme_dev_ioctl,
2323 };
2324
2325 static int nvme_dev_start(struct nvme_dev *dev)
2326 {
2327         int result;
2328
2329         result = nvme_dev_map(dev);
2330         if (result)
2331                 return result;
2332
2333         result = nvme_configure_admin_queue(dev);
2334         if (result)
2335                 goto unmap;
2336
2337         spin_lock(&dev_list_lock);
2338         list_add(&dev->node, &dev_list);
2339         spin_unlock(&dev_list_lock);
2340
2341         result = nvme_setup_io_queues(dev);
2342         if (result && result != -EBUSY)
2343                 goto disable;
2344
2345         return result;
2346
2347  disable:
2348         nvme_disable_queue(dev, 0);
2349         spin_lock(&dev_list_lock);
2350         list_del_init(&dev->node);
2351         spin_unlock(&dev_list_lock);
2352  unmap:
2353         nvme_dev_unmap(dev);
2354         return result;
2355 }
2356
2357 static int nvme_remove_dead_ctrl(void *arg)
2358 {
2359         struct nvme_dev *dev = (struct nvme_dev *)arg;
2360         struct pci_dev *pdev = dev->pci_dev;
2361
2362         if (pci_get_drvdata(pdev))
2363                 pci_stop_and_remove_bus_device(pdev);
2364         kref_put(&dev->kref, nvme_free_dev);
2365         return 0;
2366 }
2367
2368 static void nvme_remove_disks(struct work_struct *ws)
2369 {
2370         int i;
2371         struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work);
2372
2373         nvme_dev_remove(dev);
2374         spin_lock(&dev_list_lock);
2375         for (i = dev->queue_count - 1; i > 0; i--) {
2376                 BUG_ON(!dev->queues[i] || !dev->queues[i]->q_suspended);
2377                 nvme_free_queue(dev->queues[i]);
2378                 dev->queue_count--;
2379                 dev->queues[i] = NULL;
2380         }
2381         spin_unlock(&dev_list_lock);
2382 }
2383
2384 static int nvme_dev_resume(struct nvme_dev *dev)
2385 {
2386         int ret;
2387
2388         ret = nvme_dev_start(dev);
2389         if (ret && ret != -EBUSY)
2390                 return ret;
2391         if (ret == -EBUSY) {
2392                 spin_lock(&dev_list_lock);
2393                 dev->reset_workfn = nvme_remove_disks;
2394                 queue_work(nvme_workq, &dev->reset_work);
2395                 spin_unlock(&dev_list_lock);
2396         }
2397         dev->initialized = 1;
2398         return 0;
2399 }
2400
2401 static void nvme_dev_reset(struct nvme_dev *dev)
2402 {
2403         nvme_dev_shutdown(dev);
2404         if (nvme_dev_resume(dev)) {
2405                 dev_err(&dev->pci_dev->dev, "Device failed to resume\n");
2406                 kref_get(&dev->kref);
2407                 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d",
2408                                                         dev->instance))) {
2409                         dev_err(&dev->pci_dev->dev,
2410                                 "Failed to start controller remove task\n");
2411                         kref_put(&dev->kref, nvme_free_dev);
2412                 }
2413         }
2414 }
2415
2416 static void nvme_reset_failed_dev(struct work_struct *ws)
2417 {
2418         struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work);
2419         nvme_dev_reset(dev);
2420 }
2421
2422 static void nvme_reset_workfn(struct work_struct *work)
2423 {
2424         struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work);
2425         dev->reset_workfn(work);
2426 }
2427
2428 static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
2429 {
2430         int result = -ENOMEM;
2431         struct nvme_dev *dev;
2432
2433         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2434         if (!dev)
2435                 return -ENOMEM;
2436         dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry),
2437                                                                 GFP_KERNEL);
2438         if (!dev->entry)
2439                 goto free;
2440         dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *),
2441                                                                 GFP_KERNEL);
2442         if (!dev->queues)
2443                 goto free;
2444
2445         INIT_LIST_HEAD(&dev->namespaces);
2446         dev->reset_workfn = nvme_reset_failed_dev;
2447         INIT_WORK(&dev->reset_work, nvme_reset_workfn);
2448         dev->pci_dev = pdev;
2449         pci_set_drvdata(pdev, dev);
2450         result = nvme_set_instance(dev);
2451         if (result)
2452                 goto free;
2453
2454         result = nvme_setup_prp_pools(dev);
2455         if (result)
2456                 goto release;
2457
2458         result = nvme_dev_start(dev);
2459         if (result) {
2460                 if (result == -EBUSY)
2461                         goto create_cdev;
2462                 goto release_pools;
2463         }
2464
2465         kref_init(&dev->kref);
2466         result = nvme_dev_add(dev);
2467         if (result)
2468                 goto shutdown;
2469
2470  create_cdev:
2471         scnprintf(dev->name, sizeof(dev->name), "nvme%d", dev->instance);
2472         dev->miscdev.minor = MISC_DYNAMIC_MINOR;
2473         dev->miscdev.parent = &pdev->dev;
2474         dev->miscdev.name = dev->name;
2475         dev->miscdev.fops = &nvme_dev_fops;
2476         result = misc_register(&dev->miscdev);
2477         if (result)
2478                 goto remove;
2479
2480         dev->initialized = 1;
2481         return 0;
2482
2483  remove:
2484         nvme_dev_remove(dev);
2485         nvme_free_namespaces(dev);
2486  shutdown:
2487         nvme_dev_shutdown(dev);
2488  release_pools:
2489         nvme_free_queues(dev, 0);
2490         nvme_release_prp_pools(dev);
2491  release:
2492         nvme_release_instance(dev);
2493  free:
2494         kfree(dev->queues);
2495         kfree(dev->entry);
2496         kfree(dev);
2497         return result;
2498 }
2499
2500 static void nvme_shutdown(struct pci_dev *pdev)
2501 {
2502         struct nvme_dev *dev = pci_get_drvdata(pdev);
2503         nvme_dev_shutdown(dev);
2504 }
2505
2506 static void nvme_remove(struct pci_dev *pdev)
2507 {
2508         struct nvme_dev *dev = pci_get_drvdata(pdev);
2509
2510         spin_lock(&dev_list_lock);
2511         list_del_init(&dev->node);
2512         spin_unlock(&dev_list_lock);
2513
2514         pci_set_drvdata(pdev, NULL);
2515         flush_work(&dev->reset_work);
2516         misc_deregister(&dev->miscdev);
2517         nvme_dev_remove(dev);
2518         nvme_dev_shutdown(dev);
2519         nvme_free_queues(dev, 0);
2520         nvme_release_instance(dev);
2521         nvme_release_prp_pools(dev);
2522         kref_put(&dev->kref, nvme_free_dev);
2523 }
2524
2525 /* These functions are yet to be implemented */
2526 #define nvme_error_detected NULL
2527 #define nvme_dump_registers NULL
2528 #define nvme_link_reset NULL
2529 #define nvme_slot_reset NULL
2530 #define nvme_error_resume NULL
2531
2532 static int nvme_suspend(struct device *dev)
2533 {
2534         struct pci_dev *pdev = to_pci_dev(dev);
2535         struct nvme_dev *ndev = pci_get_drvdata(pdev);
2536
2537         nvme_dev_shutdown(ndev);
2538         return 0;
2539 }
2540
2541 static int nvme_resume(struct device *dev)
2542 {
2543         struct pci_dev *pdev = to_pci_dev(dev);
2544         struct nvme_dev *ndev = pci_get_drvdata(pdev);
2545
2546         if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) {
2547                 ndev->reset_workfn = nvme_reset_failed_dev;
2548                 queue_work(nvme_workq, &ndev->reset_work);
2549         }
2550         return 0;
2551 }
2552
2553 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
2554
2555 static const struct pci_error_handlers nvme_err_handler = {
2556         .error_detected = nvme_error_detected,
2557         .mmio_enabled   = nvme_dump_registers,
2558         .link_reset     = nvme_link_reset,
2559         .slot_reset     = nvme_slot_reset,
2560         .resume         = nvme_error_resume,
2561 };
2562
2563 /* Move to pci_ids.h later */
2564 #define PCI_CLASS_STORAGE_EXPRESS       0x010802
2565
2566 static DEFINE_PCI_DEVICE_TABLE(nvme_id_table) = {
2567         { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
2568         { 0, }
2569 };
2570 MODULE_DEVICE_TABLE(pci, nvme_id_table);
2571
2572 static struct pci_driver nvme_driver = {
2573         .name           = "nvme",
2574         .id_table       = nvme_id_table,
2575         .probe          = nvme_probe,
2576         .remove         = nvme_remove,
2577         .shutdown       = nvme_shutdown,
2578         .driver         = {
2579                 .pm     = &nvme_dev_pm_ops,
2580         },
2581         .err_handler    = &nvme_err_handler,
2582 };
2583
2584 static int __init nvme_init(void)
2585 {
2586         int result;
2587
2588         nvme_thread = kthread_run(nvme_kthread, NULL, "nvme");
2589         if (IS_ERR(nvme_thread))
2590                 return PTR_ERR(nvme_thread);
2591
2592         result = -ENOMEM;
2593         nvme_workq = create_singlethread_workqueue("nvme");
2594         if (!nvme_workq)
2595                 goto kill_kthread;
2596
2597         result = register_blkdev(nvme_major, "nvme");
2598         if (result < 0)
2599                 goto kill_workq;
2600         else if (result > 0)
2601                 nvme_major = result;
2602
2603         result = pci_register_driver(&nvme_driver);
2604         if (result)
2605                 goto unregister_blkdev;
2606         return 0;
2607
2608  unregister_blkdev:
2609         unregister_blkdev(nvme_major, "nvme");
2610  kill_workq:
2611         destroy_workqueue(nvme_workq);
2612  kill_kthread:
2613         kthread_stop(nvme_thread);
2614         return result;
2615 }
2616
2617 static void __exit nvme_exit(void)
2618 {
2619         pci_unregister_driver(&nvme_driver);
2620         unregister_blkdev(nvme_major, "nvme");
2621         destroy_workqueue(nvme_workq);
2622         kthread_stop(nvme_thread);
2623 }
2624
2625 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
2626 MODULE_LICENSE("GPL");
2627 MODULE_VERSION("0.8");
2628 module_init(nvme_init);
2629 module_exit(nvme_exit);