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 static int nvme_major;
  37 module_param(nvme_major, int, 0);
  38
  39 static int nvme_char_major;
  40 module_param(nvme_char_major, int, 0);
  41
  42 static LIST_HEAD(nvme_ctrl_list);
  43 DEFINE_SPINLOCK(dev_list_lock);
  44
  45 static struct class *nvme_class;
  46
  47 static void nvme_free_ns(struct kref *kref)
  48 {
  49         struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
  50
  51         if (ns->type == NVME_NS_LIGHTNVM)
  52                 nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
  53
  54         spin_lock(&dev_list_lock);
  55         ns->disk->private_data = NULL;
  56         spin_unlock(&dev_list_lock);
  57
  58         nvme_put_ctrl(ns->ctrl);
  59         put_disk(ns->disk);
  60         kfree(ns);
  61 }
  62
  63 static void nvme_put_ns(struct nvme_ns *ns)
  64 {
  65         kref_put(&ns->kref, nvme_free_ns);
  66 }
  67
  68 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
  69 {
  70         struct nvme_ns *ns;
  71
  72         spin_lock(&dev_list_lock);
  73         ns = disk->private_data;
  74         if (ns && !kref_get_unless_zero(&ns->kref))
  75                 ns = NULL;
  76         spin_unlock(&dev_list_lock);
  77
  78         return ns;
  79 }
  80
  81 struct request *nvme_alloc_request(struct request_queue *q,
  82                 struct nvme_command *cmd, unsigned int flags)
  83 {
  84         bool write = cmd->common.opcode & 1;
  85         struct request *req;
  86
  87         req = blk_mq_alloc_request(q, write, flags);
  88         if (IS_ERR(req))
  89                 return req;
  90
  91         req->cmd_type = REQ_TYPE_DRV_PRIV;
  92         req->cmd_flags |= REQ_FAILFAST_DRIVER;
  93         req->__data_len = 0;
  94         req->__sector = (sector_t) -1;
  95         req->bio = req->biotail = NULL;
  96
  97         req->cmd = (unsigned char *)cmd;
  98         req->cmd_len = sizeof(struct nvme_command);
  99         req->special = (void *)0;
 100
 101         return req;
 102 }
 103
 104 /*
 105  * Returns 0 on success.  If the result is negative, it's a Linux error code;
 106  * if the result is positive, it's an NVM Express status code
 107  */
 108 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 109                 void *buffer, unsigned bufflen, u32 *result, unsigned timeout)
 110 {
 111         struct request *req;
 112         int ret;
 113
 114         req = nvme_alloc_request(q, cmd, 0);
 115         if (IS_ERR(req))
 116                 return PTR_ERR(req);
 117
 118         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 119
 120         if (buffer && bufflen) {
 121                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
 122                 if (ret)
 123                         goto out;
 124         }
 125
 126         blk_execute_rq(req->q, NULL, req, 0);
 127         if (result)
 128                 *result = (u32)(uintptr_t)req->special;
 129         ret = req->errors;
 130  out:
 131         blk_mq_free_request(req);
 132         return ret;
 133 }
 134
 135 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 136                 void *buffer, unsigned bufflen)
 137 {
 138         return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0);
 139 }
 140
 141 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 142                 void __user *ubuffer, unsigned bufflen,
 143                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 144                 u32 *result, unsigned timeout)
 145 {
 146         bool write = cmd->common.opcode & 1;
 147         struct nvme_ns *ns = q->queuedata;
 148         struct gendisk *disk = ns ? ns->disk : NULL;
 149         struct request *req;
 150         struct bio *bio = NULL;
 151         void *meta = NULL;
 152         int ret;
 153
 154         req = nvme_alloc_request(q, cmd, 0);
 155         if (IS_ERR(req))
 156                 return PTR_ERR(req);
 157
 158         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 159
 160         if (ubuffer && bufflen) {
 161                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
 162                                 GFP_KERNEL);
 163                 if (ret)
 164                         goto out;
 165                 bio = req->bio;
 166
 167                 if (!disk)
 168                         goto submit;
 169                 bio->bi_bdev = bdget_disk(disk, 0);
 170                 if (!bio->bi_bdev) {
 171                         ret = -ENODEV;
 172                         goto out_unmap;
 173                 }
 174
 175                 if (meta_buffer) {
 176                         struct bio_integrity_payload *bip;
 177
 178                         meta = kmalloc(meta_len, GFP_KERNEL);
 179                         if (!meta) {
 180                                 ret = -ENOMEM;
 181                                 goto out_unmap;
 182                         }
 183
 184                         if (write) {
 185                                 if (copy_from_user(meta, meta_buffer,
 186                                                 meta_len)) {
 187                                         ret = -EFAULT;
 188                                         goto out_free_meta;
 189                                 }
 190                         }
 191
 192                         bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
 193                         if (IS_ERR(bip)) {
 194                                 ret = PTR_ERR(bip);
 195                                 goto out_free_meta;
 196                         }
 197
 198                         bip->bip_iter.bi_size = meta_len;
 199                         bip->bip_iter.bi_sector = meta_seed;
 200
 201                         ret = bio_integrity_add_page(bio, virt_to_page(meta),
 202                                         meta_len, offset_in_page(meta));
 203                         if (ret != meta_len) {
 204                                 ret = -ENOMEM;
 205                                 goto out_free_meta;
 206                         }
 207                 }
 208         }
 209  submit:
 210         blk_execute_rq(req->q, disk, req, 0);
 211         ret = req->errors;
 212         if (result)
 213                 *result = (u32)(uintptr_t)req->special;
 214         if (meta && !ret && !write) {
 215                 if (copy_to_user(meta_buffer, meta, meta_len))
 216                         ret = -EFAULT;
 217         }
 218  out_free_meta:
 219         kfree(meta);
 220  out_unmap:
 221         if (bio) {
 222                 if (disk && bio->bi_bdev)
 223                         bdput(bio->bi_bdev);
 224                 blk_rq_unmap_user(bio);
 225         }
 226  out:
 227         blk_mq_free_request(req);
 228         return ret;
 229 }
 230
 231 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 232                 void __user *ubuffer, unsigned bufflen, u32 *result,
 233                 unsigned timeout)
 234 {
 235         return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
 236                         result, timeout);
 237 }
 238
 239 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 240 {
 241         struct nvme_command c = { };
 242         int error;
 243
 244         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 245         c.identify.opcode = nvme_admin_identify;
 246         c.identify.cns = cpu_to_le32(1);
 247
 248         *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
 249         if (!*id)
 250                 return -ENOMEM;
 251
 252         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 253                         sizeof(struct nvme_id_ctrl));
 254         if (error)
 255                 kfree(*id);
 256         return error;
 257 }
 258
 259 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
 260 {
 261         struct nvme_command c = { };
 262
 263         c.identify.opcode = nvme_admin_identify;
 264         c.identify.cns = cpu_to_le32(2);
 265         c.identify.nsid = cpu_to_le32(nsid);
 266         return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
 267 }
 268
 269 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 270                 struct nvme_id_ns **id)
 271 {
 272         struct nvme_command c = { };
 273         int error;
 274
 275         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 276         c.identify.opcode = nvme_admin_identify,
 277         c.identify.nsid = cpu_to_le32(nsid),
 278
 279         *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 280         if (!*id)
 281                 return -ENOMEM;
 282
 283         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 284                         sizeof(struct nvme_id_ns));
 285         if (error)
 286                 kfree(*id);
 287         return error;
 288 }
 289
 290 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 291                                         dma_addr_t dma_addr, u32 *result)
 292 {
 293         struct nvme_command c;
 294
 295         memset(&c, 0, sizeof(c));
 296         c.features.opcode = nvme_admin_get_features;
 297         c.features.nsid = cpu_to_le32(nsid);
 298         c.features.prp1 = cpu_to_le64(dma_addr);
 299         c.features.fid = cpu_to_le32(fid);
 300
 301         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
 302 }
 303
 304 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 305                                         dma_addr_t dma_addr, u32 *result)
 306 {
 307         struct nvme_command c;
 308
 309         memset(&c, 0, sizeof(c));
 310         c.features.opcode = nvme_admin_set_features;
 311         c.features.prp1 = cpu_to_le64(dma_addr);
 312         c.features.fid = cpu_to_le32(fid);
 313         c.features.dword11 = cpu_to_le32(dword11);
 314
 315         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
 316 }
 317
 318 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
 319 {
 320         struct nvme_command c = { };
 321         int error;
 322
 323         c.common.opcode = nvme_admin_get_log_page,
 324         c.common.nsid = cpu_to_le32(0xFFFFFFFF),
 325         c.common.cdw10[0] = cpu_to_le32(
 326                         (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 327                          NVME_LOG_SMART),
 328
 329         *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 330         if (!*log)
 331                 return -ENOMEM;
 332
 333         error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
 334                         sizeof(struct nvme_smart_log));
 335         if (error)
 336                 kfree(*log);
 337         return error;
 338 }
 339
 340 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
 341 {
 342         u32 q_count = (*count - 1) | ((*count - 1) << 16);
 343         u32 result;
 344         int status, nr_io_queues;
 345
 346         status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
 347                         &result);
 348         if (status)
 349                 return status;
 350
 351         nr_io_queues = min(result & 0xffff, result >> 16) + 1;
 352         *count = min(*count, nr_io_queues);
 353         return 0;
 354 }
 355
 356 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 357 {
 358         struct nvme_user_io io;
 359         struct nvme_command c;
 360         unsigned length, meta_len;
 361         void __user *metadata;
 362
 363         if (copy_from_user(&io, uio, sizeof(io)))
 364                 return -EFAULT;
 365
 366         switch (io.opcode) {
 367         case nvme_cmd_write:
 368         case nvme_cmd_read:
 369         case nvme_cmd_compare:
 370                 break;
 371         default:
 372                 return -EINVAL;
 373         }
 374
 375         length = (io.nblocks + 1) << ns->lba_shift;
 376         meta_len = (io.nblocks + 1) * ns->ms;
 377         metadata = (void __user *)(uintptr_t)io.metadata;
 378
 379         if (ns->ext) {
 380                 length += meta_len;
 381                 meta_len = 0;
 382         } else if (meta_len) {
 383                 if ((io.metadata & 3) || !io.metadata)
 384                         return -EINVAL;
 385         }
 386
 387         memset(&c, 0, sizeof(c));
 388         c.rw.opcode = io.opcode;
 389         c.rw.flags = io.flags;
 390         c.rw.nsid = cpu_to_le32(ns->ns_id);
 391         c.rw.slba = cpu_to_le64(io.slba);
 392         c.rw.length = cpu_to_le16(io.nblocks);
 393         c.rw.control = cpu_to_le16(io.control);
 394         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
 395         c.rw.reftag = cpu_to_le32(io.reftag);
 396         c.rw.apptag = cpu_to_le16(io.apptag);
 397         c.rw.appmask = cpu_to_le16(io.appmask);
 398
 399         return __nvme_submit_user_cmd(ns->queue, &c,
 400                         (void __user *)(uintptr_t)io.addr, length,
 401                         metadata, meta_len, io.slba, NULL, 0);
 402 }
 403
 404 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 405                         struct nvme_passthru_cmd __user *ucmd)
 406 {
 407         struct nvme_passthru_cmd cmd;
 408         struct nvme_command c;
 409         unsigned timeout = 0;
 410         int status;
 411
 412         if (!capable(CAP_SYS_ADMIN))
 413                 return -EACCES;
 414         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 415                 return -EFAULT;
 416
 417         memset(&c, 0, sizeof(c));
 418         c.common.opcode = cmd.opcode;
 419         c.common.flags = cmd.flags;
 420         c.common.nsid = cpu_to_le32(cmd.nsid);
 421         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 422         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 423         c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
 424         c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
 425         c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
 426         c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
 427         c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
 428         c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
 429
 430         if (cmd.timeout_ms)
 431                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 432
 433         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 434                         (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
 435                         &cmd.result, timeout);
 436         if (status >= 0) {
 437                 if (put_user(cmd.result, &ucmd->result))
 438                         return -EFAULT;
 439         }
 440
 441         return status;
 442 }
 443
 444 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 445                 unsigned int cmd, unsigned long arg)
 446 {
 447         struct nvme_ns *ns = bdev->bd_disk->private_data;
 448
 449         switch (cmd) {
 450         case NVME_IOCTL_ID:
 451                 force_successful_syscall_return();
 452                 return ns->ns_id;
 453         case NVME_IOCTL_ADMIN_CMD:
 454                 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
 455         case NVME_IOCTL_IO_CMD:
 456                 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
 457         case NVME_IOCTL_SUBMIT_IO:
 458                 return nvme_submit_io(ns, (void __user *)arg);
 459         case SG_GET_VERSION_NUM:
 460                 return nvme_sg_get_version_num((void __user *)arg);
 461         case SG_IO:
 462                 return nvme_sg_io(ns, (void __user *)arg);
 463         default:
 464                 return -ENOTTY;
 465         }
 466 }
 467
 468 #ifdef CONFIG_COMPAT
 469 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
 470                         unsigned int cmd, unsigned long arg)
 471 {
 472         switch (cmd) {
 473         case SG_IO:
 474                 return -ENOIOCTLCMD;
 475         }
 476         return nvme_ioctl(bdev, mode, cmd, arg);
 477 }
 478 #else
 479 #define nvme_compat_ioctl       NULL
 480 #endif
 481
 482 static int nvme_open(struct block_device *bdev, fmode_t mode)
 483 {
 484         return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
 485 }
 486
 487 static void nvme_release(struct gendisk *disk, fmode_t mode)
 488 {
 489         nvme_put_ns(disk->private_data);
 490 }
 491
 492 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 493 {
 494         /* some standard values */
 495         geo->heads = 1 << 6;
 496         geo->sectors = 1 << 5;
 497         geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
 498         return 0;
 499 }
 500
 501 #ifdef CONFIG_BLK_DEV_INTEGRITY
 502 static void nvme_init_integrity(struct nvme_ns *ns)
 503 {
 504         struct blk_integrity integrity;
 505
 506         switch (ns->pi_type) {
 507         case NVME_NS_DPS_PI_TYPE3:
 508                 integrity.profile = &t10_pi_type3_crc;
 509                 break;
 510         case NVME_NS_DPS_PI_TYPE1:
 511         case NVME_NS_DPS_PI_TYPE2:
 512                 integrity.profile = &t10_pi_type1_crc;
 513                 break;
 514         default:
 515                 integrity.profile = NULL;
 516                 break;
 517         }
 518         integrity.tuple_size = ns->ms;
 519         blk_integrity_register(ns->disk, &integrity);
 520         blk_queue_max_integrity_segments(ns->queue, 1);
 521 }
 522 #else
 523 static void nvme_init_integrity(struct nvme_ns *ns)
 524 {
 525 }
 526 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 527
 528 static void nvme_config_discard(struct nvme_ns *ns)
 529 {
 530         u32 logical_block_size = queue_logical_block_size(ns->queue);
 531         ns->queue->limits.discard_zeroes_data = 0;
 532         ns->queue->limits.discard_alignment = logical_block_size;
 533         ns->queue->limits.discard_granularity = logical_block_size;
 534         blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
 535         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
 536 }
 537
 538 static int nvme_revalidate_disk(struct gendisk *disk)
 539 {
 540         struct nvme_ns *ns = disk->private_data;
 541         struct nvme_id_ns *id;
 542         u8 lbaf, pi_type;
 543         u16 old_ms;
 544         unsigned short bs;
 545
 546         if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
 547                 dev_warn(ns->ctrl->dev, "%s: Identify failure nvme%dn%d\n",
 548                                 __func__, ns->ctrl->instance, ns->ns_id);
 549                 return -ENODEV;
 550         }
 551         if (id->ncap == 0) {
 552                 kfree(id);
 553                 return -ENODEV;
 554         }
 555
 556         if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
 557                 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
 558                         dev_warn(ns->ctrl->dev,
 559                                 "%s: LightNVM init failure\n", __func__);
 560                         kfree(id);
 561                         return -ENODEV;
 562                 }
 563                 ns->type = NVME_NS_LIGHTNVM;
 564         }
 565
 566         old_ms = ns->ms;
 567         lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
 568         ns->lba_shift = id->lbaf[lbaf].ds;
 569         ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
 570         ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
 571
 572         /*
 573          * If identify namespace failed, use default 512 byte block size so
 574          * block layer can use before failing read/write for 0 capacity.
 575          */
 576         if (ns->lba_shift == 0)
 577                 ns->lba_shift = 9;
 578         bs = 1 << ns->lba_shift;
 579
 580         /* XXX: PI implementation requires metadata equal t10 pi tuple size */
 581         pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
 582                                         id->dps & NVME_NS_DPS_PI_MASK : 0;
 583
 584         blk_mq_freeze_queue(disk->queue);
 585         if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
 586                                 ns->ms != old_ms ||
 587                                 bs != queue_logical_block_size(disk->queue) ||
 588                                 (ns->ms && ns->ext)))
 589                 blk_integrity_unregister(disk);
 590
 591         ns->pi_type = pi_type;
 592         blk_queue_logical_block_size(ns->queue, bs);
 593
 594         if (ns->ms && !ns->ext)
 595                 nvme_init_integrity(ns);
 596
 597         if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
 598                 set_capacity(disk, 0);
 599         else
 600                 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
 601
 602         if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
 603                 nvme_config_discard(ns);
 604         blk_mq_unfreeze_queue(disk->queue);
 605
 606         kfree(id);
 607         return 0;
 608 }
 609
 610 static char nvme_pr_type(enum pr_type type)
 611 {
 612         switch (type) {
 613         case PR_WRITE_EXCLUSIVE:
 614                 return 1;
 615         case PR_EXCLUSIVE_ACCESS:
 616                 return 2;
 617         case PR_WRITE_EXCLUSIVE_REG_ONLY:
 618                 return 3;
 619         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
 620                 return 4;
 621         case PR_WRITE_EXCLUSIVE_ALL_REGS:
 622                 return 5;
 623         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
 624                 return 6;
 625         default:
 626                 return 0;
 627         }
 628 };
 629
 630 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 631                                 u64 key, u64 sa_key, u8 op)
 632 {
 633         struct nvme_ns *ns = bdev->bd_disk->private_data;
 634         struct nvme_command c;
 635         u8 data[16] = { 0, };
 636
 637         put_unaligned_le64(key, &data[0]);
 638         put_unaligned_le64(sa_key, &data[8]);
 639
 640         memset(&c, 0, sizeof(c));
 641         c.common.opcode = op;
 642         c.common.nsid = cpu_to_le32(ns->ns_id);
 643         c.common.cdw10[0] = cpu_to_le32(cdw10);
 644
 645         return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
 646 }
 647
 648 static int nvme_pr_register(struct block_device *bdev, u64 old,
 649                 u64 new, unsigned flags)
 650 {
 651         u32 cdw10;
 652
 653         if (flags & ~PR_FL_IGNORE_KEY)
 654                 return -EOPNOTSUPP;
 655
 656         cdw10 = old ? 2 : 0;
 657         cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
 658         cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
 659         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
 660 }
 661
 662 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
 663                 enum pr_type type, unsigned flags)
 664 {
 665         u32 cdw10;
 666
 667         if (flags & ~PR_FL_IGNORE_KEY)
 668                 return -EOPNOTSUPP;
 669
 670         cdw10 = nvme_pr_type(type) << 8;
 671         cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
 672         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
 673 }
 674
 675 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
 676                 enum pr_type type, bool abort)
 677 {
 678         u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
 679         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
 680 }
 681
 682 static int nvme_pr_clear(struct block_device *bdev, u64 key)
 683 {
 684         u32 cdw10 = 1 | (key ? 1 << 3 : 0);
 685         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
 686 }
 687
 688 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
 689 {
 690         u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
 691         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
 692 }
 693
 694 static const struct pr_ops nvme_pr_ops = {
 695         .pr_register    = nvme_pr_register,
 696         .pr_reserve     = nvme_pr_reserve,
 697         .pr_release     = nvme_pr_release,
 698         .pr_preempt     = nvme_pr_preempt,
 699         .pr_clear       = nvme_pr_clear,
 700 };
 701
 702 static const struct block_device_operations nvme_fops = {
 703         .owner          = THIS_MODULE,
 704         .ioctl          = nvme_ioctl,
 705         .compat_ioctl   = nvme_compat_ioctl,
 706         .open           = nvme_open,
 707         .release        = nvme_release,
 708         .getgeo         = nvme_getgeo,
 709         .revalidate_disk= nvme_revalidate_disk,
 710         .pr_ops         = &nvme_pr_ops,
 711 };
 712
 713 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
 714 {
 715         unsigned long timeout =
 716                 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
 717         u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
 718         int ret;
 719
 720         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
 721                 if ((csts & NVME_CSTS_RDY) == bit)
 722                         break;
 723
 724                 msleep(100);
 725                 if (fatal_signal_pending(current))
 726                         return -EINTR;
 727                 if (time_after(jiffies, timeout)) {
 728                         dev_err(ctrl->dev,
 729                                 "Device not ready; aborting %s\n", enabled ?
 730                                                 "initialisation" : "reset");
 731                         return -ENODEV;
 732                 }
 733         }
 734
 735         return ret;
 736 }
 737
 738 /*
 739  * If the device has been passed off to us in an enabled state, just clear
 740  * the enabled bit.  The spec says we should set the 'shutdown notification
 741  * bits', but doing so may cause the device to complete commands to the
 742  * admin queue ... and we don't know what memory that might be pointing at!
 743  */
 744 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
 745 {
 746         int ret;
 747
 748         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
 749         ctrl->ctrl_config &= ~NVME_CC_ENABLE;
 750
 751         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 752         if (ret)
 753                 return ret;
 754         return nvme_wait_ready(ctrl, cap, false);
 755 }
 756
 757 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
 758 {
 759         /*
 760          * Default to a 4K page size, with the intention to update this
 761          * path in the future to accomodate architectures with differing
 762          * kernel and IO page sizes.
 763          */
 764         unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
 765         int ret;
 766
 767         if (page_shift < dev_page_min) {
 768                 dev_err(ctrl->dev,
 769                         "Minimum device page size %u too large for host (%u)\n",
 770                         1 << dev_page_min, 1 << page_shift);
 771                 return -ENODEV;
 772         }
 773
 774         ctrl->page_size = 1 << page_shift;
 775
 776         ctrl->ctrl_config = NVME_CC_CSS_NVM;
 777         ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
 778         ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
 779         ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
 780         ctrl->ctrl_config |= NVME_CC_ENABLE;
 781
 782         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 783         if (ret)
 784                 return ret;
 785         return nvme_wait_ready(ctrl, cap, true);
 786 }
 787
 788 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
 789 {
 790         unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
 791         u32 csts;
 792         int ret;
 793
 794         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
 795         ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
 796
 797         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 798         if (ret)
 799                 return ret;
 800
 801         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
 802                 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
 803                         break;
 804
 805                 msleep(100);
 806                 if (fatal_signal_pending(current))
 807                         return -EINTR;
 808                 if (time_after(jiffies, timeout)) {
 809                         dev_err(ctrl->dev,
 810                                 "Device shutdown incomplete; abort shutdown\n");
 811                         return -ENODEV;
 812                 }
 813         }
 814
 815         return ret;
 816 }
 817
 818 /*
 819  * Initialize the cached copies of the Identify data and various controller
 820  * register in our nvme_ctrl structure.  This should be called as soon as
 821  * the admin queue is fully up and running.
 822  */
 823 int nvme_init_identify(struct nvme_ctrl *ctrl)
 824 {
 825         struct nvme_id_ctrl *id;
 826         u64 cap;
 827         int ret, page_shift;
 828
 829         ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
 830         if (ret) {
 831                 dev_err(ctrl->dev, "Reading VS failed (%d)\n", ret);
 832                 return ret;
 833         }
 834
 835         ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
 836         if (ret) {
 837                 dev_err(ctrl->dev, "Reading CAP failed (%d)\n", ret);
 838                 return ret;
 839         }
 840         page_shift = NVME_CAP_MPSMIN(cap) + 12;
 841
 842         if (ctrl->vs >= NVME_VS(1, 1))
 843                 ctrl->subsystem = NVME_CAP_NSSRC(cap);
 844
 845         ret = nvme_identify_ctrl(ctrl, &id);
 846         if (ret) {
 847                 dev_err(ctrl->dev, "Identify Controller failed (%d)\n", ret);
 848                 return -EIO;
 849         }
 850
 851         ctrl->oncs = le16_to_cpup(&id->oncs);
 852         atomic_set(&ctrl->abort_limit, id->acl + 1);
 853         ctrl->vwc = id->vwc;
 854         memcpy(ctrl->serial, id->sn, sizeof(id->sn));
 855         memcpy(ctrl->model, id->mn, sizeof(id->mn));
 856         memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
 857         if (id->mdts)
 858                 ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
 859         else
 860                 ctrl->max_hw_sectors = UINT_MAX;
 861
 862         if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
 863                 unsigned int max_hw_sectors;
 864
 865                 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
 866                 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
 867                 if (ctrl->max_hw_sectors) {
 868                         ctrl->max_hw_sectors = min(max_hw_sectors,
 869                                                         ctrl->max_hw_sectors);
 870                 } else {
 871                         ctrl->max_hw_sectors = max_hw_sectors;
 872                 }
 873         }
 874
 875         kfree(id);
 876         return 0;
 877 }
 878
 879 static int nvme_dev_open(struct inode *inode, struct file *file)
 880 {
 881         struct nvme_ctrl *ctrl;
 882         int instance = iminor(inode);
 883         int ret = -ENODEV;
 884
 885         spin_lock(&dev_list_lock);
 886         list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
 887                 if (ctrl->instance != instance)
 888                         continue;
 889
 890                 if (!ctrl->admin_q) {
 891                         ret = -EWOULDBLOCK;
 892                         break;
 893                 }
 894                 if (!kref_get_unless_zero(&ctrl->kref))
 895                         break;
 896                 file->private_data = ctrl;
 897                 ret = 0;
 898                 break;
 899         }
 900         spin_unlock(&dev_list_lock);
 901
 902         return ret;
 903 }
 904
 905 static int nvme_dev_release(struct inode *inode, struct file *file)
 906 {
 907         nvme_put_ctrl(file->private_data);
 908         return 0;
 909 }
 910
 911 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 912                 unsigned long arg)
 913 {
 914         struct nvme_ctrl *ctrl = file->private_data;
 915         void __user *argp = (void __user *)arg;
 916         struct nvme_ns *ns;
 917
 918         switch (cmd) {
 919         case NVME_IOCTL_ADMIN_CMD:
 920                 return nvme_user_cmd(ctrl, NULL, argp);
 921         case NVME_IOCTL_IO_CMD:
 922                 if (list_empty(&ctrl->namespaces))
 923                         return -ENOTTY;
 924                 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
 925                 return nvme_user_cmd(ctrl, ns, argp);
 926         case NVME_IOCTL_RESET:
 927                 dev_warn(ctrl->dev, "resetting controller\n");
 928                 return ctrl->ops->reset_ctrl(ctrl);
 929         case NVME_IOCTL_SUBSYS_RESET:
 930                 return nvme_reset_subsystem(ctrl);
 931         default:
 932                 return -ENOTTY;
 933         }
 934 }
 935
 936 static const struct file_operations nvme_dev_fops = {
 937         .owner          = THIS_MODULE,
 938         .open           = nvme_dev_open,
 939         .release        = nvme_dev_release,
 940         .unlocked_ioctl = nvme_dev_ioctl,
 941         .compat_ioctl   = nvme_dev_ioctl,
 942 };
 943
 944 static ssize_t nvme_sysfs_reset(struct device *dev,
 945                                 struct device_attribute *attr, const char *buf,
 946                                 size_t count)
 947 {
 948         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
 949         int ret;
 950
 951         ret = ctrl->ops->reset_ctrl(ctrl);
 952         if (ret < 0)
 953                 return ret;
 954         return count;
 955 }
 956 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
 957
 958 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
 959 {
 960         struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
 961         struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
 962
 963         return nsa->ns_id - nsb->ns_id;
 964 }
 965
 966 static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 967 {
 968         struct nvme_ns *ns;
 969
 970         list_for_each_entry(ns, &ctrl->namespaces, list) {
 971                 if (ns->ns_id == nsid)
 972                         return ns;
 973                 if (ns->ns_id > nsid)
 974                         break;
 975         }
 976         return NULL;
 977 }
 978
 979 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 980 {
 981         struct nvme_ns *ns;
 982         struct gendisk *disk;
 983         int node = dev_to_node(ctrl->dev);
 984
 985         ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
 986         if (!ns)
 987                 return;
 988
 989         ns->queue = blk_mq_init_queue(ctrl->tagset);
 990         if (IS_ERR(ns->queue))
 991                 goto out_free_ns;
 992         queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
 993         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
 994         ns->queue->queuedata = ns;
 995         ns->ctrl = ctrl;
 996
 997         disk = alloc_disk_node(0, node);
 998         if (!disk)
 999                 goto out_free_queue;
1000
1001         kref_init(&ns->kref);
1002         ns->ns_id = nsid;
1003         ns->disk = disk;
1004         ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1005         list_add_tail(&ns->list, &ctrl->namespaces);
1006
1007         blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1008         if (ctrl->max_hw_sectors) {
1009                 blk_queue_max_hw_sectors(ns->queue, ctrl->max_hw_sectors);
1010                 blk_queue_max_segments(ns->queue,
1011                         (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1);
1012         }
1013         if (ctrl->stripe_size)
1014                 blk_queue_chunk_sectors(ns->queue, ctrl->stripe_size >> 9);
1015         if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1016                 blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
1017         blk_queue_virt_boundary(ns->queue, ctrl->page_size - 1);
1018
1019         disk->major = nvme_major;
1020         disk->first_minor = 0;
1021         disk->fops = &nvme_fops;
1022         disk->private_data = ns;
1023         disk->queue = ns->queue;
1024         disk->driverfs_dev = ctrl->device;
1025         disk->flags = GENHD_FL_EXT_DEVT;
1026         sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, nsid);
1027
1028         /*
1029          * Initialize capacity to 0 until we establish the namespace format and
1030          * setup integrity extentions if necessary. The revalidate_disk after
1031          * add_disk allows the driver to register with integrity if the format
1032          * requires it.
1033          */
1034         set_capacity(disk, 0);
1035         if (nvme_revalidate_disk(ns->disk))
1036                 goto out_free_disk;
1037
1038         kref_get(&ctrl->kref);
1039         if (ns->type != NVME_NS_LIGHTNVM) {
1040                 add_disk(ns->disk);
1041                 if (ns->ms) {
1042                         struct block_device *bd = bdget_disk(ns->disk, 0);
1043                         if (!bd)
1044                                 return;
1045                         if (blkdev_get(bd, FMODE_READ, NULL)) {
1046                                 bdput(bd);
1047                                 return;
1048                         }
1049                         blkdev_reread_part(bd);
1050                         blkdev_put(bd, FMODE_READ);
1051                 }
1052         }
1053
1054         return;
1055  out_free_disk:
1056         kfree(disk);
1057         list_del(&ns->list);
1058  out_free_queue:
1059         blk_cleanup_queue(ns->queue);
1060  out_free_ns:
1061         kfree(ns);
1062 }
1063
1064 static void nvme_ns_remove(struct nvme_ns *ns)
1065 {
1066         bool kill = nvme_io_incapable(ns->ctrl) &&
1067                         !blk_queue_dying(ns->queue);
1068
1069         if (kill)
1070                 blk_set_queue_dying(ns->queue);
1071         if (ns->disk->flags & GENHD_FL_UP) {
1072                 if (blk_get_integrity(ns->disk))
1073                         blk_integrity_unregister(ns->disk);
1074                 del_gendisk(ns->disk);
1075         }
1076         if (kill || !blk_queue_dying(ns->queue)) {
1077                 blk_mq_abort_requeue_list(ns->queue);
1078                 blk_cleanup_queue(ns->queue);
1079         }
1080         list_del_init(&ns->list);
1081         nvme_put_ns(ns);
1082 }
1083
1084 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1085 {
1086         struct nvme_ns *ns;
1087
1088         ns = nvme_find_ns(ctrl, nsid);
1089         if (ns) {
1090                 if (revalidate_disk(ns->disk))
1091                         nvme_ns_remove(ns);
1092         } else
1093                 nvme_alloc_ns(ctrl, nsid);
1094 }
1095
1096 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1097 {
1098         struct nvme_ns *ns;
1099         __le32 *ns_list;
1100         unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1101         int ret = 0;
1102
1103         ns_list = kzalloc(0x1000, GFP_KERNEL);
1104         if (!ns_list)
1105                 return -ENOMEM;
1106
1107         for (i = 0; i < num_lists; i++) {
1108                 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1109                 if (ret)
1110                         goto out;
1111
1112                 for (j = 0; j < min(nn, 1024U); j++) {
1113                         nsid = le32_to_cpu(ns_list[j]);
1114                         if (!nsid)
1115                                 goto out;
1116
1117                         nvme_validate_ns(ctrl, nsid);
1118
1119                         while (++prev < nsid) {
1120                                 ns = nvme_find_ns(ctrl, prev);
1121                                 if (ns)
1122                                         nvme_ns_remove(ns);
1123                         }
1124                 }
1125                 nn -= j;
1126         }
1127  out:
1128         kfree(ns_list);
1129         return ret;
1130 }
1131
1132 static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn)
1133 {
1134         struct nvme_ns *ns, *next;
1135         unsigned i;
1136
1137         for (i = 1; i <= nn; i++)
1138                 nvme_validate_ns(ctrl, i);
1139
1140         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1141                 if (ns->ns_id > nn)
1142                         nvme_ns_remove(ns);
1143         }
1144 }
1145
1146 void nvme_scan_namespaces(struct nvme_ctrl *ctrl)
1147 {
1148         struct nvme_id_ctrl *id;
1149         unsigned nn;
1150
1151         if (nvme_identify_ctrl(ctrl, &id))
1152                 return;
1153
1154         nn = le32_to_cpu(id->nn);
1155         if (ctrl->vs >= NVME_VS(1, 1) &&
1156             !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1157                 if (!nvme_scan_ns_list(ctrl, nn))
1158                         goto done;
1159         }
1160         __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn));
1161  done:
1162         list_sort(NULL, &ctrl->namespaces, ns_cmp);
1163         kfree(id);
1164 }
1165
1166 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1167 {
1168         struct nvme_ns *ns, *next;
1169
1170         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1171                 nvme_ns_remove(ns);
1172 }
1173
1174 static DEFINE_IDA(nvme_instance_ida);
1175
1176 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1177 {
1178         int instance, error;
1179
1180         do {
1181                 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1182                         return -ENODEV;
1183
1184                 spin_lock(&dev_list_lock);
1185                 error = ida_get_new(&nvme_instance_ida, &instance);
1186                 spin_unlock(&dev_list_lock);
1187         } while (error == -EAGAIN);
1188
1189         if (error)
1190                 return -ENODEV;
1191
1192         ctrl->instance = instance;
1193         return 0;
1194 }
1195
1196 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1197 {
1198         spin_lock(&dev_list_lock);
1199         ida_remove(&nvme_instance_ida, ctrl->instance);
1200         spin_unlock(&dev_list_lock);
1201 }
1202
1203 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1204  {
1205         device_remove_file(ctrl->device, &dev_attr_reset_controller);
1206         device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1207
1208         spin_lock(&dev_list_lock);
1209         list_del(&ctrl->node);
1210         spin_unlock(&dev_list_lock);
1211 }
1212
1213 static void nvme_free_ctrl(struct kref *kref)
1214 {
1215         struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1216
1217         put_device(ctrl->device);
1218         nvme_release_instance(ctrl);
1219
1220         ctrl->ops->free_ctrl(ctrl);
1221 }
1222
1223 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1224 {
1225         kref_put(&ctrl->kref, nvme_free_ctrl);
1226 }
1227
1228 /*
1229  * Initialize a NVMe controller structures.  This needs to be called during
1230  * earliest initialization so that we have the initialized structured around
1231  * during probing.
1232  */
1233 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1234                 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1235 {
1236         int ret;
1237
1238         INIT_LIST_HEAD(&ctrl->namespaces);
1239         kref_init(&ctrl->kref);
1240         ctrl->dev = dev;
1241         ctrl->ops = ops;
1242         ctrl->quirks = quirks;
1243
1244         ret = nvme_set_instance(ctrl);
1245         if (ret)
1246                 goto out;
1247
1248         ctrl->device = device_create(nvme_class, ctrl->dev,
1249                                 MKDEV(nvme_char_major, ctrl->instance),
1250                                 dev, "nvme%d", ctrl->instance);
1251         if (IS_ERR(ctrl->device)) {
1252                 ret = PTR_ERR(ctrl->device);
1253                 goto out_release_instance;
1254         }
1255         get_device(ctrl->device);
1256         dev_set_drvdata(ctrl->device, ctrl);
1257
1258         ret = device_create_file(ctrl->device, &dev_attr_reset_controller);
1259         if (ret)
1260                 goto out_put_device;
1261
1262         spin_lock(&dev_list_lock);
1263         list_add_tail(&ctrl->node, &nvme_ctrl_list);
1264         spin_unlock(&dev_list_lock);
1265
1266         return 0;
1267
1268 out_put_device:
1269         put_device(ctrl->device);
1270         device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1271 out_release_instance:
1272         nvme_release_instance(ctrl);
1273 out:
1274         return ret;
1275 }
1276
1277 int __init nvme_core_init(void)
1278 {
1279         int result;
1280
1281         result = register_blkdev(nvme_major, "nvme");
1282         if (result < 0)
1283                 return result;
1284         else if (result > 0)
1285                 nvme_major = result;
1286
1287         result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
1288                                                         &nvme_dev_fops);
1289         if (result < 0)
1290                 goto unregister_blkdev;
1291         else if (result > 0)
1292                 nvme_char_major = result;
1293
1294         nvme_class = class_create(THIS_MODULE, "nvme");
1295         if (IS_ERR(nvme_class)) {
1296                 result = PTR_ERR(nvme_class);
1297                 goto unregister_chrdev;
1298         }
1299
1300         return 0;
1301
1302  unregister_chrdev:
1303         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1304  unregister_blkdev:
1305         unregister_blkdev(nvme_major, "nvme");
1306         return result;
1307 }
1308
1309 void nvme_core_exit(void)
1310 {
1311         unregister_blkdev(nvme_major, "nvme");
1312         class_destroy(nvme_class);
1313         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1314 }