drivers/nvme/host/core.c

   1 /*
   2  * NVM Express device driver
   3  * Copyright (c) 2011-2014, 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
  15 #include <linux/blkdev.h>
  16 #include <linux/blk-mq.h>
  17 #include <linux/delay.h>
  18 #include <linux/errno.h>
  19 #include <linux/hdreg.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/list_sort.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25 #include <linux/pr.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/nvme_ioctl.h>
  28 #include <linux/t10-pi.h>
  29 #include <scsi/sg.h>
  30 #include <asm/unaligned.h>
  31
  32 #include "nvme.h"
  33
  34 #define NVME_MINORS             (1U << MINORBITS)
  35
  36 unsigned char admin_timeout = 60;
  37 module_param(admin_timeout, byte, 0644);
  38 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
  39 EXPORT_SYMBOL_GPL(admin_timeout);
  40
  41 unsigned char nvme_io_timeout = 30;
  42 module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
  43 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
  44 EXPORT_SYMBOL_GPL(nvme_io_timeout);
  45
  46 unsigned char shutdown_timeout = 5;
  47 module_param(shutdown_timeout, byte, 0644);
  48 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
  49
  50 static int nvme_major;
  51 module_param(nvme_major, int, 0);
  52
  53 static int nvme_char_major;
  54 module_param(nvme_char_major, int, 0);
  55
  56 static LIST_HEAD(nvme_ctrl_list);
  57 static DEFINE_SPINLOCK(dev_list_lock);
  58
  59 static struct class *nvme_class;
  60
  61 void nvme_cancel_request(struct request *req, void *data, bool reserved)
  62 {
  63         int status;
  64
  65         if (!blk_mq_request_started(req))
  66                 return;
  67
  68         dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
  69                                 "Cancelling I/O %d", req->tag);
  70
  71         status = NVME_SC_ABORT_REQ;
  72         if (blk_queue_dying(req->q))
  73                 status |= NVME_SC_DNR;
  74         blk_mq_complete_request(req, status);
  75 }
  76 EXPORT_SYMBOL_GPL(nvme_cancel_request);
  77
  78 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
  79                 enum nvme_ctrl_state new_state)
  80 {
  81         enum nvme_ctrl_state old_state = ctrl->state;
  82         bool changed = false;
  83
  84         spin_lock_irq(&ctrl->lock);
  85         switch (new_state) {
  86         case NVME_CTRL_LIVE:
  87                 switch (old_state) {
  88                 case NVME_CTRL_RESETTING:
  89                         changed = true;
  90                         /* FALLTHRU */
  91                 default:
  92                         break;
  93                 }
  94                 break;
  95         case NVME_CTRL_RESETTING:
  96                 switch (old_state) {
  97                 case NVME_CTRL_NEW:
  98                 case NVME_CTRL_LIVE:
  99                         changed = true;
 100                         /* FALLTHRU */
 101                 default:
 102                         break;
 103                 }
 104                 break;
 105         case NVME_CTRL_DELETING:
 106                 switch (old_state) {
 107                 case NVME_CTRL_LIVE:
 108                 case NVME_CTRL_RESETTING:
 109                         changed = true;
 110                         /* FALLTHRU */
 111                 default:
 112                         break;
 113                 }
 114                 break;
 115         case NVME_CTRL_DEAD:
 116                 switch (old_state) {
 117                 case NVME_CTRL_DELETING:
 118                         changed = true;
 119                         /* FALLTHRU */
 120                 default:
 121                         break;
 122                 }
 123                 break;
 124         default:
 125                 break;
 126         }
 127         spin_unlock_irq(&ctrl->lock);
 128
 129         if (changed)
 130                 ctrl->state = new_state;
 131
 132         return changed;
 133 }
 134 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
 135
 136 static void nvme_free_ns(struct kref *kref)
 137 {
 138         struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
 139
 140         if (ns->type == NVME_NS_LIGHTNVM)
 141                 nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
 142
 143         spin_lock(&dev_list_lock);
 144         ns->disk->private_data = NULL;
 145         spin_unlock(&dev_list_lock);
 146
 147         put_disk(ns->disk);
 148         ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
 149         nvme_put_ctrl(ns->ctrl);
 150         kfree(ns);
 151 }
 152
 153 static void nvme_put_ns(struct nvme_ns *ns)
 154 {
 155         kref_put(&ns->kref, nvme_free_ns);
 156 }
 157
 158 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
 159 {
 160         struct nvme_ns *ns;
 161
 162         spin_lock(&dev_list_lock);
 163         ns = disk->private_data;
 164         if (ns) {
 165                 if (!kref_get_unless_zero(&ns->kref))
 166                         goto fail;
 167                 if (!try_module_get(ns->ctrl->ops->module))
 168                         goto fail_put_ns;
 169         }
 170         spin_unlock(&dev_list_lock);
 171
 172         return ns;
 173
 174 fail_put_ns:
 175         kref_put(&ns->kref, nvme_free_ns);
 176 fail:
 177         spin_unlock(&dev_list_lock);
 178         return NULL;
 179 }
 180
 181 void nvme_requeue_req(struct request *req)
 182 {
 183         unsigned long flags;
 184
 185         blk_mq_requeue_request(req);
 186         spin_lock_irqsave(req->q->queue_lock, flags);
 187         if (!blk_queue_stopped(req->q))
 188                 blk_mq_kick_requeue_list(req->q);
 189         spin_unlock_irqrestore(req->q->queue_lock, flags);
 190 }
 191 EXPORT_SYMBOL_GPL(nvme_requeue_req);
 192
 193 struct request *nvme_alloc_request(struct request_queue *q,
 194                 struct nvme_command *cmd, unsigned int flags)
 195 {
 196         bool write = cmd->common.opcode & 1;
 197         struct request *req;
 198
 199         req = blk_mq_alloc_request(q, write, flags);
 200         if (IS_ERR(req))
 201                 return req;
 202
 203         req->cmd_type = REQ_TYPE_DRV_PRIV;
 204         req->cmd_flags |= REQ_FAILFAST_DRIVER;
 205         req->__data_len = 0;
 206         req->__sector = (sector_t) -1;
 207         req->bio = req->biotail = NULL;
 208
 209         req->cmd = (unsigned char *)cmd;
 210         req->cmd_len = sizeof(struct nvme_command);
 211
 212         return req;
 213 }
 214 EXPORT_SYMBOL_GPL(nvme_alloc_request);
 215
 216 static inline void nvme_setup_flush(struct nvme_ns *ns,
 217                 struct nvme_command *cmnd)
 218 {
 219         memset(cmnd, 0, sizeof(*cmnd));
 220         cmnd->common.opcode = nvme_cmd_flush;
 221         cmnd->common.nsid = cpu_to_le32(ns->ns_id);
 222 }
 223
 224 static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
 225                 struct nvme_command *cmnd)
 226 {
 227         struct nvme_dsm_range *range;
 228         struct page *page;
 229         int offset;
 230         unsigned int nr_bytes = blk_rq_bytes(req);
 231
 232         range = kmalloc(sizeof(*range), GFP_ATOMIC);
 233         if (!range)
 234                 return BLK_MQ_RQ_QUEUE_BUSY;
 235
 236         range->cattr = cpu_to_le32(0);
 237         range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
 238         range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 239
 240         memset(cmnd, 0, sizeof(*cmnd));
 241         cmnd->dsm.opcode = nvme_cmd_dsm;
 242         cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
 243         cmnd->dsm.nr = 0;
 244         cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
 245
 246         req->completion_data = range;
 247         page = virt_to_page(range);
 248         offset = offset_in_page(range);
 249         blk_add_request_payload(req, page, offset, sizeof(*range));
 250
 251         /*
 252          * we set __data_len back to the size of the area to be discarded
 253          * on disk. This allows us to report completion on the full amount
 254          * of blocks described by the request.
 255          */
 256         req->__data_len = nr_bytes;
 257
 258         return 0;
 259 }
 260
 261 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
 262                 struct nvme_command *cmnd)
 263 {
 264         u16 control = 0;
 265         u32 dsmgmt = 0;
 266
 267         if (req->cmd_flags & REQ_FUA)
 268                 control |= NVME_RW_FUA;
 269         if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
 270                 control |= NVME_RW_LR;
 271
 272         if (req->cmd_flags & REQ_RAHEAD)
 273                 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
 274
 275         memset(cmnd, 0, sizeof(*cmnd));
 276         cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
 277         cmnd->rw.command_id = req->tag;
 278         cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
 279         cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 280         cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
 281
 282         if (ns->ms) {
 283                 switch (ns->pi_type) {
 284                 case NVME_NS_DPS_PI_TYPE3:
 285                         control |= NVME_RW_PRINFO_PRCHK_GUARD;
 286                         break;
 287                 case NVME_NS_DPS_PI_TYPE1:
 288                 case NVME_NS_DPS_PI_TYPE2:
 289                         control |= NVME_RW_PRINFO_PRCHK_GUARD |
 290                                         NVME_RW_PRINFO_PRCHK_REF;
 291                         cmnd->rw.reftag = cpu_to_le32(
 292                                         nvme_block_nr(ns, blk_rq_pos(req)));
 293                         break;
 294                 }
 295                 if (!blk_integrity_rq(req))
 296                         control |= NVME_RW_PRINFO_PRACT;
 297         }
 298
 299         cmnd->rw.control = cpu_to_le16(control);
 300         cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
 301 }
 302
 303 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 304                 struct nvme_command *cmd)
 305 {
 306         int ret = 0;
 307
 308         if (req->cmd_type == REQ_TYPE_DRV_PRIV)
 309                 memcpy(cmd, req->cmd, sizeof(*cmd));
 310         else if (req_op(req) == REQ_OP_FLUSH)
 311                 nvme_setup_flush(ns, cmd);
 312         else if (req_op(req) == REQ_OP_DISCARD)
 313                 ret = nvme_setup_discard(ns, req, cmd);
 314         else
 315                 nvme_setup_rw(ns, req, cmd);
 316
 317         return ret;
 318 }
 319 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
 320
 321 /*
 322  * Returns 0 on success.  If the result is negative, it's a Linux error code;
 323  * if the result is positive, it's an NVM Express status code
 324  */
 325 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 326                 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
 327                 unsigned timeout)
 328 {
 329         struct request *req;
 330         int ret;
 331
 332         req = nvme_alloc_request(q, cmd, 0);
 333         if (IS_ERR(req))
 334                 return PTR_ERR(req);
 335
 336         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 337         req->special = cqe;
 338
 339         if (buffer && bufflen) {
 340                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
 341                 if (ret)
 342                         goto out;
 343         }
 344
 345         blk_execute_rq(req->q, NULL, req, 0);
 346         ret = req->errors;
 347  out:
 348         blk_mq_free_request(req);
 349         return ret;
 350 }
 351
 352 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 353                 void *buffer, unsigned bufflen)
 354 {
 355         return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0);
 356 }
 357 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
 358
 359 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 360                 void __user *ubuffer, unsigned bufflen,
 361                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 362                 u32 *result, unsigned timeout)
 363 {
 364         bool write = cmd->common.opcode & 1;
 365         struct nvme_completion cqe;
 366         struct nvme_ns *ns = q->queuedata;
 367         struct gendisk *disk = ns ? ns->disk : NULL;
 368         struct request *req;
 369         struct bio *bio = NULL;
 370         void *meta = NULL;
 371         int ret;
 372
 373         req = nvme_alloc_request(q, cmd, 0);
 374         if (IS_ERR(req))
 375                 return PTR_ERR(req);
 376
 377         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 378         req->special = &cqe;
 379
 380         if (ubuffer && bufflen) {
 381                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
 382                                 GFP_KERNEL);
 383                 if (ret)
 384                         goto out;
 385                 bio = req->bio;
 386
 387                 if (!disk)
 388                         goto submit;
 389                 bio->bi_bdev = bdget_disk(disk, 0);
 390                 if (!bio->bi_bdev) {
 391                         ret = -ENODEV;
 392                         goto out_unmap;
 393                 }
 394
 395                 if (meta_buffer && meta_len) {
 396                         struct bio_integrity_payload *bip;
 397
 398                         meta = kmalloc(meta_len, GFP_KERNEL);
 399                         if (!meta) {
 400                                 ret = -ENOMEM;
 401                                 goto out_unmap;
 402                         }
 403
 404                         if (write) {
 405                                 if (copy_from_user(meta, meta_buffer,
 406                                                 meta_len)) {
 407                                         ret = -EFAULT;
 408                                         goto out_free_meta;
 409                                 }
 410                         }
 411
 412                         bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
 413                         if (IS_ERR(bip)) {
 414                                 ret = PTR_ERR(bip);
 415                                 goto out_free_meta;
 416                         }
 417
 418                         bip->bip_iter.bi_size = meta_len;
 419                         bip->bip_iter.bi_sector = meta_seed;
 420
 421                         ret = bio_integrity_add_page(bio, virt_to_page(meta),
 422                                         meta_len, offset_in_page(meta));
 423                         if (ret != meta_len) {
 424                                 ret = -ENOMEM;
 425                                 goto out_free_meta;
 426                         }
 427                 }
 428         }
 429  submit:
 430         blk_execute_rq(req->q, disk, req, 0);
 431         ret = req->errors;
 432         if (result)
 433                 *result = le32_to_cpu(cqe.result);
 434         if (meta && !ret && !write) {
 435                 if (copy_to_user(meta_buffer, meta, meta_len))
 436                         ret = -EFAULT;
 437         }
 438  out_free_meta:
 439         kfree(meta);
 440  out_unmap:
 441         if (bio) {
 442                 if (disk && bio->bi_bdev)
 443                         bdput(bio->bi_bdev);
 444                 blk_rq_unmap_user(bio);
 445         }
 446  out:
 447         blk_mq_free_request(req);
 448         return ret;
 449 }
 450
 451 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 452                 void __user *ubuffer, unsigned bufflen, u32 *result,
 453                 unsigned timeout)
 454 {
 455         return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
 456                         result, timeout);
 457 }
 458
 459 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 460 {
 461         struct nvme_command c = { };
 462         int error;
 463
 464         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 465         c.identify.opcode = nvme_admin_identify;
 466         c.identify.cns = cpu_to_le32(1);
 467
 468         *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
 469         if (!*id)
 470                 return -ENOMEM;
 471
 472         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 473                         sizeof(struct nvme_id_ctrl));
 474         if (error)
 475                 kfree(*id);
 476         return error;
 477 }
 478
 479 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
 480 {
 481         struct nvme_command c = { };
 482
 483         c.identify.opcode = nvme_admin_identify;
 484         c.identify.cns = cpu_to_le32(2);
 485         c.identify.nsid = cpu_to_le32(nsid);
 486         return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
 487 }
 488
 489 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 490                 struct nvme_id_ns **id)
 491 {
 492         struct nvme_command c = { };
 493         int error;
 494
 495         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 496         c.identify.opcode = nvme_admin_identify,
 497         c.identify.nsid = cpu_to_le32(nsid),
 498
 499         *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 500         if (!*id)
 501                 return -ENOMEM;
 502
 503         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 504                         sizeof(struct nvme_id_ns));
 505         if (error)
 506                 kfree(*id);
 507         return error;
 508 }
 509
 510 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 511                                         dma_addr_t dma_addr, u32 *result)
 512 {
 513         struct nvme_command c;
 514         struct nvme_completion cqe;
 515         int ret;
 516
 517         memset(&c, 0, sizeof(c));
 518         c.features.opcode = nvme_admin_get_features;
 519         c.features.nsid = cpu_to_le32(nsid);
 520         c.features.prp1 = cpu_to_le64(dma_addr);
 521         c.features.fid = cpu_to_le32(fid);
 522
 523         ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
 524         if (ret >= 0)
 525                 *result = le32_to_cpu(cqe.result);
 526         return ret;
 527 }
 528
 529 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 530                                         dma_addr_t dma_addr, u32 *result)
 531 {
 532         struct nvme_command c;
 533         struct nvme_completion cqe;
 534         int ret;
 535
 536         memset(&c, 0, sizeof(c));
 537         c.features.opcode = nvme_admin_set_features;
 538         c.features.prp1 = cpu_to_le64(dma_addr);
 539         c.features.fid = cpu_to_le32(fid);
 540         c.features.dword11 = cpu_to_le32(dword11);
 541
 542         ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
 543         if (ret >= 0)
 544                 *result = le32_to_cpu(cqe.result);
 545         return ret;
 546 }
 547
 548 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
 549 {
 550         struct nvme_command c = { };
 551         int error;
 552
 553         c.common.opcode = nvme_admin_get_log_page,
 554         c.common.nsid = cpu_to_le32(0xFFFFFFFF),
 555         c.common.cdw10[0] = cpu_to_le32(
 556                         (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 557                          NVME_LOG_SMART),
 558
 559         *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 560         if (!*log)
 561                 return -ENOMEM;
 562
 563         error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
 564                         sizeof(struct nvme_smart_log));
 565         if (error)
 566                 kfree(*log);
 567         return error;
 568 }
 569
 570 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
 571 {
 572         u32 q_count = (*count - 1) | ((*count - 1) << 16);
 573         u32 result;
 574         int status, nr_io_queues;
 575
 576         status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
 577                         &result);
 578         if (status)
 579                 return status;
 580
 581         nr_io_queues = min(result & 0xffff, result >> 16) + 1;
 582         *count = min(*count, nr_io_queues);
 583         return 0;
 584 }
 585 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
 586
 587 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 588 {
 589         struct nvme_user_io io;
 590         struct nvme_command c;
 591         unsigned length, meta_len;
 592         void __user *metadata;
 593
 594         if (copy_from_user(&io, uio, sizeof(io)))
 595                 return -EFAULT;
 596         if (io.flags)
 597                 return -EINVAL;
 598
 599         switch (io.opcode) {
 600         case nvme_cmd_write:
 601         case nvme_cmd_read:
 602         case nvme_cmd_compare:
 603                 break;
 604         default:
 605                 return -EINVAL;
 606         }
 607
 608         length = (io.nblocks + 1) << ns->lba_shift;
 609         meta_len = (io.nblocks + 1) * ns->ms;
 610         metadata = (void __user *)(uintptr_t)io.metadata;
 611
 612         if (ns->ext) {
 613                 length += meta_len;
 614                 meta_len = 0;
 615         } else if (meta_len) {
 616                 if ((io.metadata & 3) || !io.metadata)
 617                         return -EINVAL;
 618         }
 619
 620         memset(&c, 0, sizeof(c));
 621         c.rw.opcode = io.opcode;
 622         c.rw.flags = io.flags;
 623         c.rw.nsid = cpu_to_le32(ns->ns_id);
 624         c.rw.slba = cpu_to_le64(io.slba);
 625         c.rw.length = cpu_to_le16(io.nblocks);
 626         c.rw.control = cpu_to_le16(io.control);
 627         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
 628         c.rw.reftag = cpu_to_le32(io.reftag);
 629         c.rw.apptag = cpu_to_le16(io.apptag);
 630         c.rw.appmask = cpu_to_le16(io.appmask);
 631
 632         return __nvme_submit_user_cmd(ns->queue, &c,
 633                         (void __user *)(uintptr_t)io.addr, length,
 634                         metadata, meta_len, io.slba, NULL, 0);
 635 }
 636
 637 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 638                         struct nvme_passthru_cmd __user *ucmd)
 639 {
 640         struct nvme_passthru_cmd cmd;
 641         struct nvme_command c;
 642         unsigned timeout = 0;
 643         int status;
 644
 645         if (!capable(CAP_SYS_ADMIN))
 646                 return -EACCES;
 647         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 648                 return -EFAULT;
 649         if (cmd.flags)
 650                 return -EINVAL;
 651
 652         memset(&c, 0, sizeof(c));
 653         c.common.opcode = cmd.opcode;
 654         c.common.flags = cmd.flags;
 655         c.common.nsid = cpu_to_le32(cmd.nsid);
 656         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 657         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 658         c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
 659         c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
 660         c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
 661         c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
 662         c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
 663         c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
 664
 665         if (cmd.timeout_ms)
 666                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 667
 668         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 669                         (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
 670                         &cmd.result, timeout);
 671         if (status >= 0) {
 672                 if (put_user(cmd.result, &ucmd->result))
 673                         return -EFAULT;
 674         }
 675
 676         return status;
 677 }
 678
 679 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 680                 unsigned int cmd, unsigned long arg)
 681 {
 682         struct nvme_ns *ns = bdev->bd_disk->private_data;
 683
 684         switch (cmd) {
 685         case NVME_IOCTL_ID:
 686                 force_successful_syscall_return();
 687                 return ns->ns_id;
 688         case NVME_IOCTL_ADMIN_CMD:
 689                 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
 690         case NVME_IOCTL_IO_CMD:
 691                 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
 692         case NVME_IOCTL_SUBMIT_IO:
 693                 return nvme_submit_io(ns, (void __user *)arg);
 694 #ifdef CONFIG_BLK_DEV_NVME_SCSI
 695         case SG_GET_VERSION_NUM:
 696                 return nvme_sg_get_version_num((void __user *)arg);
 697         case SG_IO:
 698                 return nvme_sg_io(ns, (void __user *)arg);
 699 #endif
 700         default:
 701                 return -ENOTTY;
 702         }
 703 }
 704
 705 #ifdef CONFIG_COMPAT
 706 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
 707                         unsigned int cmd, unsigned long arg)
 708 {
 709         switch (cmd) {
 710         case SG_IO:
 711                 return -ENOIOCTLCMD;
 712         }
 713         return nvme_ioctl(bdev, mode, cmd, arg);
 714 }
 715 #else
 716 #define nvme_compat_ioctl       NULL
 717 #endif
 718
 719 static int nvme_open(struct block_device *bdev, fmode_t mode)
 720 {
 721         return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
 722 }
 723
 724 static void nvme_release(struct gendisk *disk, fmode_t mode)
 725 {
 726         struct nvme_ns *ns = disk->private_data;
 727
 728         module_put(ns->ctrl->ops->module);
 729         nvme_put_ns(ns);
 730 }
 731
 732 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 733 {
 734         /* some standard values */
 735         geo->heads = 1 << 6;
 736         geo->sectors = 1 << 5;
 737         geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
 738         return 0;
 739 }
 740
 741 #ifdef CONFIG_BLK_DEV_INTEGRITY
 742 static void nvme_init_integrity(struct nvme_ns *ns)
 743 {
 744         struct blk_integrity integrity;
 745
 746         switch (ns->pi_type) {
 747         case NVME_NS_DPS_PI_TYPE3:
 748                 integrity.profile = &t10_pi_type3_crc;
 749                 integrity.tag_size = sizeof(u16) + sizeof(u32);
 750                 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
 751                 break;
 752         case NVME_NS_DPS_PI_TYPE1:
 753         case NVME_NS_DPS_PI_TYPE2:
 754                 integrity.profile = &t10_pi_type1_crc;
 755                 integrity.tag_size = sizeof(u16);
 756                 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
 757                 break;
 758         default:
 759                 integrity.profile = NULL;
 760                 break;
 761         }
 762         integrity.tuple_size = ns->ms;
 763         blk_integrity_register(ns->disk, &integrity);
 764         blk_queue_max_integrity_segments(ns->queue, 1);
 765 }
 766 #else
 767 static void nvme_init_integrity(struct nvme_ns *ns)
 768 {
 769 }
 770 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 771
 772 static void nvme_config_discard(struct nvme_ns *ns)
 773 {
 774         struct nvme_ctrl *ctrl = ns->ctrl;
 775         u32 logical_block_size = queue_logical_block_size(ns->queue);
 776
 777         if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES)
 778                 ns->queue->limits.discard_zeroes_data = 1;
 779         else
 780                 ns->queue->limits.discard_zeroes_data = 0;
 781
 782         ns->queue->limits.discard_alignment = logical_block_size;
 783         ns->queue->limits.discard_granularity = logical_block_size;
 784         blk_queue_max_discard_sectors(ns->queue, UINT_MAX);
 785         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
 786 }
 787
 788 static int nvme_revalidate_disk(struct gendisk *disk)
 789 {
 790         struct nvme_ns *ns = disk->private_data;
 791         struct nvme_id_ns *id;
 792         u8 lbaf, pi_type;
 793         u16 old_ms;
 794         unsigned short bs;
 795
 796         if (test_bit(NVME_NS_DEAD, &ns->flags)) {
 797                 set_capacity(disk, 0);
 798                 return -ENODEV;
 799         }
 800         if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
 801                 dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n",
 802                                 __func__);
 803                 return -ENODEV;
 804         }
 805         if (id->ncap == 0) {
 806                 kfree(id);
 807                 return -ENODEV;
 808         }
 809
 810         if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
 811                 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
 812                         dev_warn(disk_to_dev(ns->disk),
 813                                 "%s: LightNVM init failure\n", __func__);
 814                         kfree(id);
 815                         return -ENODEV;
 816                 }
 817                 ns->type = NVME_NS_LIGHTNVM;
 818         }
 819
 820         if (ns->ctrl->vs >= NVME_VS(1, 1))
 821                 memcpy(ns->eui, id->eui64, sizeof(ns->eui));
 822         if (ns->ctrl->vs >= NVME_VS(1, 2))
 823                 memcpy(ns->uuid, id->nguid, sizeof(ns->uuid));
 824
 825         old_ms = ns->ms;
 826         lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
 827         ns->lba_shift = id->lbaf[lbaf].ds;
 828         ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
 829         ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
 830
 831         /*
 832          * If identify namespace failed, use default 512 byte block size so
 833          * block layer can use before failing read/write for 0 capacity.
 834          */
 835         if (ns->lba_shift == 0)
 836                 ns->lba_shift = 9;
 837         bs = 1 << ns->lba_shift;
 838         /* XXX: PI implementation requires metadata equal t10 pi tuple size */
 839         pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
 840                                         id->dps & NVME_NS_DPS_PI_MASK : 0;
 841
 842         blk_mq_freeze_queue(disk->queue);
 843         if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
 844                                 ns->ms != old_ms ||
 845                                 bs != queue_logical_block_size(disk->queue) ||
 846                                 (ns->ms && ns->ext)))
 847                 blk_integrity_unregister(disk);
 848
 849         ns->pi_type = pi_type;
 850         blk_queue_logical_block_size(ns->queue, bs);
 851
 852         if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
 853                 nvme_init_integrity(ns);
 854         if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
 855                 set_capacity(disk, 0);
 856         else
 857                 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
 858
 859         if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
 860                 nvme_config_discard(ns);
 861         blk_mq_unfreeze_queue(disk->queue);
 862
 863         kfree(id);
 864         return 0;
 865 }
 866
 867 static char nvme_pr_type(enum pr_type type)
 868 {
 869         switch (type) {
 870         case PR_WRITE_EXCLUSIVE:
 871                 return 1;
 872         case PR_EXCLUSIVE_ACCESS:
 873                 return 2;
 874         case PR_WRITE_EXCLUSIVE_REG_ONLY:
 875                 return 3;
 876         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
 877                 return 4;
 878         case PR_WRITE_EXCLUSIVE_ALL_REGS:
 879                 return 5;
 880         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
 881                 return 6;
 882         default:
 883                 return 0;
 884         }
 885 };
 886
 887 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 888                                 u64 key, u64 sa_key, u8 op)
 889 {
 890         struct nvme_ns *ns = bdev->bd_disk->private_data;
 891         struct nvme_command c;
 892         u8 data[16] = { 0, };
 893
 894         put_unaligned_le64(key, &data[0]);
 895         put_unaligned_le64(sa_key, &data[8]);
 896
 897         memset(&c, 0, sizeof(c));
 898         c.common.opcode = op;
 899         c.common.nsid = cpu_to_le32(ns->ns_id);
 900         c.common.cdw10[0] = cpu_to_le32(cdw10);
 901
 902         return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
 903 }
 904
 905 static int nvme_pr_register(struct block_device *bdev, u64 old,
 906                 u64 new, unsigned flags)
 907 {
 908         u32 cdw10;
 909
 910         if (flags & ~PR_FL_IGNORE_KEY)
 911                 return -EOPNOTSUPP;
 912
 913         cdw10 = old ? 2 : 0;
 914         cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
 915         cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
 916         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
 917 }
 918
 919 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
 920                 enum pr_type type, unsigned flags)
 921 {
 922         u32 cdw10;
 923
 924         if (flags & ~PR_FL_IGNORE_KEY)
 925                 return -EOPNOTSUPP;
 926
 927         cdw10 = nvme_pr_type(type) << 8;
 928         cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
 929         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
 930 }
 931
 932 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
 933                 enum pr_type type, bool abort)
 934 {
 935         u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
 936         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
 937 }
 938
 939 static int nvme_pr_clear(struct block_device *bdev, u64 key)
 940 {
 941         u32 cdw10 = 1 | (key ? 1 << 3 : 0);
 942         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
 943 }
 944
 945 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
 946 {
 947         u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
 948         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
 949 }
 950
 951 static const struct pr_ops nvme_pr_ops = {
 952         .pr_register    = nvme_pr_register,
 953         .pr_reserve     = nvme_pr_reserve,
 954         .pr_release     = nvme_pr_release,
 955         .pr_preempt     = nvme_pr_preempt,
 956         .pr_clear       = nvme_pr_clear,
 957 };
 958
 959 static const struct block_device_operations nvme_fops = {
 960         .owner          = THIS_MODULE,
 961         .ioctl          = nvme_ioctl,
 962         .compat_ioctl   = nvme_compat_ioctl,
 963         .open           = nvme_open,
 964         .release        = nvme_release,
 965         .getgeo         = nvme_getgeo,
 966         .revalidate_disk= nvme_revalidate_disk,
 967         .pr_ops         = &nvme_pr_ops,
 968 };
 969
 970 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
 971 {
 972         unsigned long timeout =
 973                 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
 974         u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
 975         int ret;
 976
 977         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
 978                 if ((csts & NVME_CSTS_RDY) == bit)
 979                         break;
 980
 981                 msleep(100);
 982                 if (fatal_signal_pending(current))
 983                         return -EINTR;
 984                 if (time_after(jiffies, timeout)) {
 985                         dev_err(ctrl->device,
 986                                 "Device not ready; aborting %s\n", enabled ?
 987                                                 "initialisation" : "reset");
 988                         return -ENODEV;
 989                 }
 990         }
 991
 992         return ret;
 993 }
 994
 995 /*
 996  * If the device has been passed off to us in an enabled state, just clear
 997  * the enabled bit.  The spec says we should set the 'shutdown notification
 998  * bits', but doing so may cause the device to complete commands to the
 999  * admin queue ... and we don't know what memory that might be pointing at!
1000  */
1001 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1002 {
1003         int ret;
1004
1005         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1006         ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1007
1008         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1009         if (ret)
1010                 return ret;
1011         return nvme_wait_ready(ctrl, cap, false);
1012 }
1013 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1014
1015 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1016 {
1017         /*
1018          * Default to a 4K page size, with the intention to update this
1019          * path in the future to accomodate architectures with differing
1020          * kernel and IO page sizes.
1021          */
1022         unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
1023         int ret;
1024
1025         if (page_shift < dev_page_min) {
1026                 dev_err(ctrl->device,
1027                         "Minimum device page size %u too large for host (%u)\n",
1028                         1 << dev_page_min, 1 << page_shift);
1029                 return -ENODEV;
1030         }
1031
1032         ctrl->page_size = 1 << page_shift;
1033
1034         ctrl->ctrl_config = NVME_CC_CSS_NVM;
1035         ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1036         ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
1037         ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1038         ctrl->ctrl_config |= NVME_CC_ENABLE;
1039
1040         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1041         if (ret)
1042                 return ret;
1043         return nvme_wait_ready(ctrl, cap, true);
1044 }
1045 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1046
1047 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
1048 {
1049         unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
1050         u32 csts;
1051         int ret;
1052
1053         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1054         ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
1055
1056         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1057         if (ret)
1058                 return ret;
1059
1060         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1061                 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
1062                         break;
1063
1064                 msleep(100);
1065                 if (fatal_signal_pending(current))
1066                         return -EINTR;
1067                 if (time_after(jiffies, timeout)) {
1068                         dev_err(ctrl->device,
1069                                 "Device shutdown incomplete; abort shutdown\n");
1070                         return -ENODEV;
1071                 }
1072         }
1073
1074         return ret;
1075 }
1076 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1077
1078 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
1079                 struct request_queue *q)
1080 {
1081         bool vwc = false;
1082
1083         if (ctrl->max_hw_sectors) {
1084                 u32 max_segments =
1085                         (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
1086
1087                 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1088                 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1089         }
1090         if (ctrl->stripe_size)
1091                 blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9);
1092         blk_queue_virt_boundary(q, ctrl->page_size - 1);
1093         if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1094                 vwc = true;
1095         blk_queue_write_cache(q, vwc, vwc);
1096 }
1097
1098 /*
1099  * Initialize the cached copies of the Identify data and various controller
1100  * register in our nvme_ctrl structure.  This should be called as soon as
1101  * the admin queue is fully up and running.
1102  */
1103 int nvme_init_identify(struct nvme_ctrl *ctrl)
1104 {
1105         struct nvme_id_ctrl *id;
1106         u64 cap;
1107         int ret, page_shift;
1108         u32 max_hw_sectors;
1109
1110         ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
1111         if (ret) {
1112                 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
1113                 return ret;
1114         }
1115
1116         ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
1117         if (ret) {
1118                 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1119                 return ret;
1120         }
1121         page_shift = NVME_CAP_MPSMIN(cap) + 12;
1122
1123         if (ctrl->vs >= NVME_VS(1, 1))
1124                 ctrl->subsystem = NVME_CAP_NSSRC(cap);
1125
1126         ret = nvme_identify_ctrl(ctrl, &id);
1127         if (ret) {
1128                 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
1129                 return -EIO;
1130         }
1131
1132         ctrl->vid = le16_to_cpu(id->vid);
1133         ctrl->oncs = le16_to_cpup(&id->oncs);
1134         atomic_set(&ctrl->abort_limit, id->acl + 1);
1135         ctrl->vwc = id->vwc;
1136         ctrl->cntlid = le16_to_cpup(&id->cntlid);
1137         memcpy(ctrl->serial, id->sn, sizeof(id->sn));
1138         memcpy(ctrl->model, id->mn, sizeof(id->mn));
1139         memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
1140         if (id->mdts)
1141                 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
1142         else
1143                 max_hw_sectors = UINT_MAX;
1144         ctrl->max_hw_sectors =
1145                 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
1146
1147         if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
1148                 unsigned int max_hw_sectors;
1149
1150                 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
1151                 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
1152                 if (ctrl->max_hw_sectors) {
1153                         ctrl->max_hw_sectors = min(max_hw_sectors,
1154                                                         ctrl->max_hw_sectors);
1155                 } else {
1156                         ctrl->max_hw_sectors = max_hw_sectors;
1157                 }
1158         }
1159
1160         nvme_set_queue_limits(ctrl, ctrl->admin_q);
1161
1162         kfree(id);
1163         return 0;
1164 }
1165 EXPORT_SYMBOL_GPL(nvme_init_identify);
1166
1167 static int nvme_dev_open(struct inode *inode, struct file *file)
1168 {
1169         struct nvme_ctrl *ctrl;
1170         int instance = iminor(inode);
1171         int ret = -ENODEV;
1172
1173         spin_lock(&dev_list_lock);
1174         list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
1175                 if (ctrl->instance != instance)
1176                         continue;
1177
1178                 if (!ctrl->admin_q) {
1179                         ret = -EWOULDBLOCK;
1180                         break;
1181                 }
1182                 if (!kref_get_unless_zero(&ctrl->kref))
1183                         break;
1184                 file->private_data = ctrl;
1185                 ret = 0;
1186                 break;
1187         }
1188         spin_unlock(&dev_list_lock);
1189
1190         return ret;
1191 }
1192
1193 static int nvme_dev_release(struct inode *inode, struct file *file)
1194 {
1195         nvme_put_ctrl(file->private_data);
1196         return 0;
1197 }
1198
1199 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
1200 {
1201         struct nvme_ns *ns;
1202         int ret;
1203
1204         mutex_lock(&ctrl->namespaces_mutex);
1205         if (list_empty(&ctrl->namespaces)) {
1206                 ret = -ENOTTY;
1207                 goto out_unlock;
1208         }
1209
1210         ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
1211         if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
1212                 dev_warn(ctrl->device,
1213                         "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
1214                 ret = -EINVAL;
1215                 goto out_unlock;
1216         }
1217
1218         dev_warn(ctrl->device,
1219                 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
1220         kref_get(&ns->kref);
1221         mutex_unlock(&ctrl->namespaces_mutex);
1222
1223         ret = nvme_user_cmd(ctrl, ns, argp);
1224         nvme_put_ns(ns);
1225         return ret;
1226
1227 out_unlock:
1228         mutex_unlock(&ctrl->namespaces_mutex);
1229         return ret;
1230 }
1231
1232 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
1233                 unsigned long arg)
1234 {
1235         struct nvme_ctrl *ctrl = file->private_data;
1236         void __user *argp = (void __user *)arg;
1237
1238         switch (cmd) {
1239         case NVME_IOCTL_ADMIN_CMD:
1240                 return nvme_user_cmd(ctrl, NULL, argp);
1241         case NVME_IOCTL_IO_CMD:
1242                 return nvme_dev_user_cmd(ctrl, argp);
1243         case NVME_IOCTL_RESET:
1244                 dev_warn(ctrl->device, "resetting controller\n");
1245                 return ctrl->ops->reset_ctrl(ctrl);
1246         case NVME_IOCTL_SUBSYS_RESET:
1247                 return nvme_reset_subsystem(ctrl);
1248         case NVME_IOCTL_RESCAN:
1249                 nvme_queue_scan(ctrl);
1250                 return 0;
1251         default:
1252                 return -ENOTTY;
1253         }
1254 }
1255
1256 static const struct file_operations nvme_dev_fops = {
1257         .owner          = THIS_MODULE,
1258         .open           = nvme_dev_open,
1259         .release        = nvme_dev_release,
1260         .unlocked_ioctl = nvme_dev_ioctl,
1261         .compat_ioctl   = nvme_dev_ioctl,
1262 };
1263
1264 static ssize_t nvme_sysfs_reset(struct device *dev,
1265                                 struct device_attribute *attr, const char *buf,
1266                                 size_t count)
1267 {
1268         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1269         int ret;
1270
1271         ret = ctrl->ops->reset_ctrl(ctrl);
1272         if (ret < 0)
1273                 return ret;
1274         return count;
1275 }
1276 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
1277
1278 static ssize_t nvme_sysfs_rescan(struct device *dev,
1279                                 struct device_attribute *attr, const char *buf,
1280                                 size_t count)
1281 {
1282         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1283
1284         nvme_queue_scan(ctrl);
1285         return count;
1286 }
1287 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
1288
1289 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
1290                                                                 char *buf)
1291 {
1292         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1293         struct nvme_ctrl *ctrl = ns->ctrl;
1294         int serial_len = sizeof(ctrl->serial);
1295         int model_len = sizeof(ctrl->model);
1296
1297         if (memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1298                 return sprintf(buf, "eui.%16phN\n", ns->uuid);
1299
1300         if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1301                 return sprintf(buf, "eui.%8phN\n", ns->eui);
1302
1303         while (ctrl->serial[serial_len - 1] == ' ')
1304                 serial_len--;
1305         while (ctrl->model[model_len - 1] == ' ')
1306                 model_len--;
1307
1308         return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
1309                 serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
1310 }
1311 static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
1312
1313 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
1314                                                                 char *buf)
1315 {
1316         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1317         return sprintf(buf, "%pU\n", ns->uuid);
1318 }
1319 static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
1320
1321 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
1322                                                                 char *buf)
1323 {
1324         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1325         return sprintf(buf, "%8phd\n", ns->eui);
1326 }
1327 static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
1328
1329 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
1330                                                                 char *buf)
1331 {
1332         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1333         return sprintf(buf, "%d\n", ns->ns_id);
1334 }
1335 static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
1336
1337 static struct attribute *nvme_ns_attrs[] = {
1338         &dev_attr_wwid.attr,
1339         &dev_attr_uuid.attr,
1340         &dev_attr_eui.attr,
1341         &dev_attr_nsid.attr,
1342         NULL,
1343 };
1344
1345 static umode_t nvme_attrs_are_visible(struct kobject *kobj,
1346                 struct attribute *a, int n)
1347 {
1348         struct device *dev = container_of(kobj, struct device, kobj);
1349         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1350
1351         if (a == &dev_attr_uuid.attr) {
1352                 if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1353                         return 0;
1354         }
1355         if (a == &dev_attr_eui.attr) {
1356                 if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1357                         return 0;
1358         }
1359         return a->mode;
1360 }
1361
1362 static const struct attribute_group nvme_ns_attr_group = {
1363         .attrs          = nvme_ns_attrs,
1364         .is_visible     = nvme_attrs_are_visible,
1365 };
1366
1367 #define nvme_show_str_function(field)                                           \
1368 static ssize_t  field##_show(struct device *dev,                                \
1369                             struct device_attribute *attr, char *buf)           \
1370 {                                                                               \
1371         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);                          \
1372         return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field);   \
1373 }                                                                               \
1374 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1375
1376 #define nvme_show_int_function(field)                                           \
1377 static ssize_t  field##_show(struct device *dev,                                \
1378                             struct device_attribute *attr, char *buf)           \
1379 {                                                                               \
1380         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);                          \
1381         return sprintf(buf, "%d\n", ctrl->field);       \
1382 }                                                                               \
1383 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1384
1385 nvme_show_str_function(model);
1386 nvme_show_str_function(serial);
1387 nvme_show_str_function(firmware_rev);
1388 nvme_show_int_function(cntlid);
1389
1390 static struct attribute *nvme_dev_attrs[] = {
1391         &dev_attr_reset_controller.attr,
1392         &dev_attr_rescan_controller.attr,
1393         &dev_attr_model.attr,
1394         &dev_attr_serial.attr,
1395         &dev_attr_firmware_rev.attr,
1396         &dev_attr_cntlid.attr,
1397         NULL
1398 };
1399
1400 static struct attribute_group nvme_dev_attrs_group = {
1401         .attrs = nvme_dev_attrs,
1402 };
1403
1404 static const struct attribute_group *nvme_dev_attr_groups[] = {
1405         &nvme_dev_attrs_group,
1406         NULL,
1407 };
1408
1409 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
1410 {
1411         struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
1412         struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
1413
1414         return nsa->ns_id - nsb->ns_id;
1415 }
1416
1417 static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1418 {
1419         struct nvme_ns *ns;
1420
1421         lockdep_assert_held(&ctrl->namespaces_mutex);
1422
1423         list_for_each_entry(ns, &ctrl->namespaces, list) {
1424                 if (ns->ns_id == nsid)
1425                         return ns;
1426                 if (ns->ns_id > nsid)
1427                         break;
1428         }
1429         return NULL;
1430 }
1431
1432 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1433 {
1434         struct nvme_ns *ns;
1435         struct gendisk *disk;
1436         int node = dev_to_node(ctrl->dev);
1437
1438         lockdep_assert_held(&ctrl->namespaces_mutex);
1439
1440         ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
1441         if (!ns)
1442                 return;
1443
1444         ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
1445         if (ns->instance < 0)
1446                 goto out_free_ns;
1447
1448         ns->queue = blk_mq_init_queue(ctrl->tagset);
1449         if (IS_ERR(ns->queue))
1450                 goto out_release_instance;
1451         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1452         ns->queue->queuedata = ns;
1453         ns->ctrl = ctrl;
1454
1455         disk = alloc_disk_node(0, node);
1456         if (!disk)
1457                 goto out_free_queue;
1458
1459         kref_init(&ns->kref);
1460         ns->ns_id = nsid;
1461         ns->disk = disk;
1462         ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1463
1464
1465         blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1466         nvme_set_queue_limits(ctrl, ns->queue);
1467
1468         disk->major = nvme_major;
1469         disk->first_minor = 0;
1470         disk->fops = &nvme_fops;
1471         disk->private_data = ns;
1472         disk->queue = ns->queue;
1473         disk->driverfs_dev = ctrl->device;
1474         disk->flags = GENHD_FL_EXT_DEVT;
1475         sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1476
1477         if (nvme_revalidate_disk(ns->disk))
1478                 goto out_free_disk;
1479
1480         list_add_tail_rcu(&ns->list, &ctrl->namespaces);
1481         kref_get(&ctrl->kref);
1482         if (ns->type == NVME_NS_LIGHTNVM)
1483                 return;
1484
1485         add_disk(ns->disk);
1486         if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
1487                                         &nvme_ns_attr_group))
1488                 pr_warn("%s: failed to create sysfs group for identification\n",
1489                         ns->disk->disk_name);
1490         return;
1491  out_free_disk:
1492         kfree(disk);
1493  out_free_queue:
1494         blk_cleanup_queue(ns->queue);
1495  out_release_instance:
1496         ida_simple_remove(&ctrl->ns_ida, ns->instance);
1497  out_free_ns:
1498         kfree(ns);
1499 }
1500
1501 static void nvme_ns_remove(struct nvme_ns *ns)
1502 {
1503         lockdep_assert_held(&ns->ctrl->namespaces_mutex);
1504
1505         if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
1506                 return;
1507
1508         if (ns->disk->flags & GENHD_FL_UP) {
1509                 if (blk_get_integrity(ns->disk))
1510                         blk_integrity_unregister(ns->disk);
1511                 sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
1512                                         &nvme_ns_attr_group);
1513                 del_gendisk(ns->disk);
1514                 blk_mq_abort_requeue_list(ns->queue);
1515                 blk_cleanup_queue(ns->queue);
1516         }
1517         list_del_init(&ns->list);
1518         synchronize_rcu();
1519         nvme_put_ns(ns);
1520 }
1521
1522 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1523 {
1524         struct nvme_ns *ns;
1525
1526         ns = nvme_find_ns(ctrl, nsid);
1527         if (ns) {
1528                 if (revalidate_disk(ns->disk))
1529                         nvme_ns_remove(ns);
1530         } else
1531                 nvme_alloc_ns(ctrl, nsid);
1532 }
1533
1534 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
1535                                         unsigned nsid)
1536 {
1537         struct nvme_ns *ns, *next;
1538
1539         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1540                 if (ns->ns_id > nsid)
1541                         nvme_ns_remove(ns);
1542         }
1543 }
1544
1545 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1546 {
1547         struct nvme_ns *ns;
1548         __le32 *ns_list;
1549         unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1550         int ret = 0;
1551
1552         ns_list = kzalloc(0x1000, GFP_KERNEL);
1553         if (!ns_list)
1554                 return -ENOMEM;
1555
1556         for (i = 0; i < num_lists; i++) {
1557                 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1558                 if (ret)
1559                         goto free;
1560
1561                 for (j = 0; j < min(nn, 1024U); j++) {
1562                         nsid = le32_to_cpu(ns_list[j]);
1563                         if (!nsid)
1564                                 goto out;
1565
1566                         nvme_validate_ns(ctrl, nsid);
1567
1568                         while (++prev < nsid) {
1569                                 ns = nvme_find_ns(ctrl, prev);
1570                                 if (ns)
1571                                         nvme_ns_remove(ns);
1572                         }
1573                 }
1574                 nn -= j;
1575         }
1576  out:
1577         nvme_remove_invalid_namespaces(ctrl, prev);
1578  free:
1579         kfree(ns_list);
1580         return ret;
1581 }
1582
1583 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
1584 {
1585         unsigned i;
1586
1587         lockdep_assert_held(&ctrl->namespaces_mutex);
1588
1589         for (i = 1; i <= nn; i++)
1590                 nvme_validate_ns(ctrl, i);
1591
1592         nvme_remove_invalid_namespaces(ctrl, nn);
1593 }
1594
1595 static void nvme_scan_work(struct work_struct *work)
1596 {
1597         struct nvme_ctrl *ctrl =
1598                 container_of(work, struct nvme_ctrl, scan_work);
1599         struct nvme_id_ctrl *id;
1600         unsigned nn;
1601
1602         if (ctrl->state != NVME_CTRL_LIVE)
1603                 return;
1604
1605         if (nvme_identify_ctrl(ctrl, &id))
1606                 return;
1607
1608         mutex_lock(&ctrl->namespaces_mutex);
1609         nn = le32_to_cpu(id->nn);
1610         if (ctrl->vs >= NVME_VS(1, 1) &&
1611             !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1612                 if (!nvme_scan_ns_list(ctrl, nn))
1613                         goto done;
1614         }
1615         nvme_scan_ns_sequential(ctrl, nn);
1616  done:
1617         list_sort(NULL, &ctrl->namespaces, ns_cmp);
1618         mutex_unlock(&ctrl->namespaces_mutex);
1619         kfree(id);
1620
1621         if (ctrl->ops->post_scan)
1622                 ctrl->ops->post_scan(ctrl);
1623 }
1624
1625 void nvme_queue_scan(struct nvme_ctrl *ctrl)
1626 {
1627         /*
1628          * Do not queue new scan work when a controller is reset during
1629          * removal.
1630          */
1631         if (ctrl->state == NVME_CTRL_LIVE)
1632                 schedule_work(&ctrl->scan_work);
1633 }
1634 EXPORT_SYMBOL_GPL(nvme_queue_scan);
1635
1636 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1637 {
1638         struct nvme_ns *ns, *next;
1639
1640         /*
1641          * The dead states indicates the controller was not gracefully
1642          * disconnected. In that case, we won't be able to flush any data while
1643          * removing the namespaces' disks; fail all the queues now to avoid
1644          * potentially having to clean up the failed sync later.
1645          */
1646         if (ctrl->state == NVME_CTRL_DEAD)
1647                 nvme_kill_queues(ctrl);
1648
1649         mutex_lock(&ctrl->namespaces_mutex);
1650         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1651                 nvme_ns_remove(ns);
1652         mutex_unlock(&ctrl->namespaces_mutex);
1653 }
1654 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
1655
1656 static void nvme_async_event_work(struct work_struct *work)
1657 {
1658         struct nvme_ctrl *ctrl =
1659                 container_of(work, struct nvme_ctrl, async_event_work);
1660
1661         spin_lock_irq(&ctrl->lock);
1662         while (ctrl->event_limit > 0) {
1663                 int aer_idx = --ctrl->event_limit;
1664
1665                 spin_unlock_irq(&ctrl->lock);
1666                 ctrl->ops->submit_async_event(ctrl, aer_idx);
1667                 spin_lock_irq(&ctrl->lock);
1668         }
1669         spin_unlock_irq(&ctrl->lock);
1670 }
1671
1672 void nvme_complete_async_event(struct nvme_ctrl *ctrl,
1673                 struct nvme_completion *cqe)
1674 {
1675         u16 status = le16_to_cpu(cqe->status) >> 1;
1676         u32 result = le32_to_cpu(cqe->result);
1677
1678         if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) {
1679                 ++ctrl->event_limit;
1680                 schedule_work(&ctrl->async_event_work);
1681         }
1682
1683         if (status != NVME_SC_SUCCESS)
1684                 return;
1685
1686         switch (result & 0xff07) {
1687         case NVME_AER_NOTICE_NS_CHANGED:
1688                 dev_info(ctrl->device, "rescanning\n");
1689                 nvme_queue_scan(ctrl);
1690                 break;
1691         default:
1692                 dev_warn(ctrl->device, "async event result %08x\n", result);
1693         }
1694 }
1695 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
1696
1697 void nvme_queue_async_events(struct nvme_ctrl *ctrl)
1698 {
1699         ctrl->event_limit = NVME_NR_AERS;
1700         schedule_work(&ctrl->async_event_work);
1701 }
1702 EXPORT_SYMBOL_GPL(nvme_queue_async_events);
1703
1704 static DEFINE_IDA(nvme_instance_ida);
1705
1706 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1707 {
1708         int instance, error;
1709
1710         do {
1711                 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1712                         return -ENODEV;
1713
1714                 spin_lock(&dev_list_lock);
1715                 error = ida_get_new(&nvme_instance_ida, &instance);
1716                 spin_unlock(&dev_list_lock);
1717         } while (error == -EAGAIN);
1718
1719         if (error)
1720                 return -ENODEV;
1721
1722         ctrl->instance = instance;
1723         return 0;
1724 }
1725
1726 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1727 {
1728         spin_lock(&dev_list_lock);
1729         ida_remove(&nvme_instance_ida, ctrl->instance);
1730         spin_unlock(&dev_list_lock);
1731 }
1732
1733 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1734 {
1735         flush_work(&ctrl->async_event_work);
1736         flush_work(&ctrl->scan_work);
1737         nvme_remove_namespaces(ctrl);
1738
1739         device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1740
1741         spin_lock(&dev_list_lock);
1742         list_del(&ctrl->node);
1743         spin_unlock(&dev_list_lock);
1744 }
1745 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
1746
1747 static void nvme_free_ctrl(struct kref *kref)
1748 {
1749         struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1750
1751         put_device(ctrl->device);
1752         nvme_release_instance(ctrl);
1753         ida_destroy(&ctrl->ns_ida);
1754
1755         ctrl->ops->free_ctrl(ctrl);
1756 }
1757
1758 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1759 {
1760         kref_put(&ctrl->kref, nvme_free_ctrl);
1761 }
1762 EXPORT_SYMBOL_GPL(nvme_put_ctrl);
1763
1764 /*
1765  * Initialize a NVMe controller structures.  This needs to be called during
1766  * earliest initialization so that we have the initialized structured around
1767  * during probing.
1768  */
1769 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1770                 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1771 {
1772         int ret;
1773
1774         ctrl->state = NVME_CTRL_NEW;
1775         spin_lock_init(&ctrl->lock);
1776         INIT_LIST_HEAD(&ctrl->namespaces);
1777         mutex_init(&ctrl->namespaces_mutex);
1778         kref_init(&ctrl->kref);
1779         ctrl->dev = dev;
1780         ctrl->ops = ops;
1781         ctrl->quirks = quirks;
1782         INIT_WORK(&ctrl->scan_work, nvme_scan_work);
1783         INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
1784
1785         ret = nvme_set_instance(ctrl);
1786         if (ret)
1787                 goto out;
1788
1789         ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
1790                                 MKDEV(nvme_char_major, ctrl->instance),
1791                                 ctrl, nvme_dev_attr_groups,
1792                                 "nvme%d", ctrl->instance);
1793         if (IS_ERR(ctrl->device)) {
1794                 ret = PTR_ERR(ctrl->device);
1795                 goto out_release_instance;
1796         }
1797         get_device(ctrl->device);
1798         ida_init(&ctrl->ns_ida);
1799
1800         spin_lock(&dev_list_lock);
1801         list_add_tail(&ctrl->node, &nvme_ctrl_list);
1802         spin_unlock(&dev_list_lock);
1803
1804         return 0;
1805 out_release_instance:
1806         nvme_release_instance(ctrl);
1807 out:
1808         return ret;
1809 }
1810 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
1811
1812 /**
1813  * nvme_kill_queues(): Ends all namespace queues
1814  * @ctrl: the dead controller that needs to end
1815  *
1816  * Call this function when the driver determines it is unable to get the
1817  * controller in a state capable of servicing IO.
1818  */
1819 void nvme_kill_queues(struct nvme_ctrl *ctrl)
1820 {
1821         struct nvme_ns *ns;
1822
1823         rcu_read_lock();
1824         list_for_each_entry_rcu(ns, &ctrl->namespaces, list) {
1825                 if (!kref_get_unless_zero(&ns->kref))
1826                         continue;
1827
1828                 /*
1829                  * Revalidating a dead namespace sets capacity to 0. This will
1830                  * end buffered writers dirtying pages that can't be synced.
1831                  */
1832                 if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags))
1833                         revalidate_disk(ns->disk);
1834
1835                 blk_set_queue_dying(ns->queue);
1836                 blk_mq_abort_requeue_list(ns->queue);
1837                 blk_mq_start_stopped_hw_queues(ns->queue, true);
1838
1839                 nvme_put_ns(ns);
1840         }
1841         rcu_read_unlock();
1842 }
1843 EXPORT_SYMBOL_GPL(nvme_kill_queues);
1844
1845 void nvme_stop_queues(struct nvme_ctrl *ctrl)
1846 {
1847         struct nvme_ns *ns;
1848
1849         rcu_read_lock();
1850         list_for_each_entry_rcu(ns, &ctrl->namespaces, list) {
1851                 spin_lock_irq(ns->queue->queue_lock);
1852                 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
1853                 spin_unlock_irq(ns->queue->queue_lock);
1854
1855                 blk_mq_cancel_requeue_work(ns->queue);
1856                 blk_mq_stop_hw_queues(ns->queue);
1857         }
1858         rcu_read_unlock();
1859 }
1860 EXPORT_SYMBOL_GPL(nvme_stop_queues);
1861
1862 void nvme_start_queues(struct nvme_ctrl *ctrl)
1863 {
1864         struct nvme_ns *ns;
1865
1866         rcu_read_lock();
1867         list_for_each_entry_rcu(ns, &ctrl->namespaces, list) {
1868                 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
1869                 blk_mq_start_stopped_hw_queues(ns->queue, true);
1870                 blk_mq_kick_requeue_list(ns->queue);
1871         }
1872         rcu_read_unlock();
1873 }
1874 EXPORT_SYMBOL_GPL(nvme_start_queues);
1875
1876 int __init nvme_core_init(void)
1877 {
1878         int result;
1879
1880         result = register_blkdev(nvme_major, "nvme");
1881         if (result < 0)
1882                 return result;
1883         else if (result > 0)
1884                 nvme_major = result;
1885
1886         result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
1887                                                         &nvme_dev_fops);
1888         if (result < 0)
1889                 goto unregister_blkdev;
1890         else if (result > 0)
1891                 nvme_char_major = result;
1892
1893         nvme_class = class_create(THIS_MODULE, "nvme");
1894         if (IS_ERR(nvme_class)) {
1895                 result = PTR_ERR(nvme_class);
1896                 goto unregister_chrdev;
1897         }
1898
1899         return 0;
1900
1901  unregister_chrdev:
1902         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1903  unregister_blkdev:
1904         unregister_blkdev(nvme_major, "nvme");
1905         return result;
1906 }
1907
1908 void nvme_core_exit(void)
1909 {
1910         class_destroy(nvme_class);
1911         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1912         unregister_blkdev(nvme_major, "nvme");
1913 }
1914
1915 MODULE_LICENSE("GPL");
1916 MODULE_VERSION("1.0");
1917 module_init(nvme_core_init);
1918 module_exit(nvme_core_exit);