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