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         put_disk(ns->disk);
  59         ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
  60         nvme_put_ctrl(ns->ctrl);
  61         kfree(ns);
  62 }
  63
  64 static void nvme_put_ns(struct nvme_ns *ns)
  65 {
  66         kref_put(&ns->kref, nvme_free_ns);
  67 }
  68
  69 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
  70 {
  71         struct nvme_ns *ns;
  72
  73         spin_lock(&dev_list_lock);
  74         ns = disk->private_data;
  75         if (ns && !kref_get_unless_zero(&ns->kref))
  76                 ns = NULL;
  77         spin_unlock(&dev_list_lock);
  78
  79         return ns;
  80 }
  81
  82 void nvme_requeue_req(struct request *req)
  83 {
  84         unsigned long flags;
  85
  86         blk_mq_requeue_request(req);
  87         spin_lock_irqsave(req->q->queue_lock, flags);
  88         if (!blk_queue_stopped(req->q))
  89                 blk_mq_kick_requeue_list(req->q);
  90         spin_unlock_irqrestore(req->q->queue_lock, flags);
  91 }
  92
  93 struct request *nvme_alloc_request(struct request_queue *q,
  94                 struct nvme_command *cmd, unsigned int flags)
  95 {
  96         bool write = cmd->common.opcode & 1;
  97         struct request *req;
  98
  99         req = blk_mq_alloc_request(q, write, flags);
 100         if (IS_ERR(req))
 101                 return req;
 102
 103         req->cmd_type = REQ_TYPE_DRV_PRIV;
 104         req->cmd_flags |= REQ_FAILFAST_DRIVER;
 105         req->__data_len = 0;
 106         req->__sector = (sector_t) -1;
 107         req->bio = req->biotail = NULL;
 108
 109         req->cmd = (unsigned char *)cmd;
 110         req->cmd_len = sizeof(struct nvme_command);
 111         req->special = (void *)0;
 112
 113         return req;
 114 }
 115
 116 /*
 117  * Returns 0 on success.  If the result is negative, it's a Linux error code;
 118  * if the result is positive, it's an NVM Express status code
 119  */
 120 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 121                 void *buffer, unsigned bufflen, u32 *result, unsigned timeout)
 122 {
 123         struct request *req;
 124         int ret;
 125
 126         req = nvme_alloc_request(q, cmd, 0);
 127         if (IS_ERR(req))
 128                 return PTR_ERR(req);
 129
 130         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 131
 132         if (buffer && bufflen) {
 133                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
 134                 if (ret)
 135                         goto out;
 136         }
 137
 138         blk_execute_rq(req->q, NULL, req, 0);
 139         if (result)
 140                 *result = (u32)(uintptr_t)req->special;
 141         ret = req->errors;
 142  out:
 143         blk_mq_free_request(req);
 144         return ret;
 145 }
 146
 147 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 148                 void *buffer, unsigned bufflen)
 149 {
 150         return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0);
 151 }
 152
 153 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 154                 void __user *ubuffer, unsigned bufflen,
 155                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 156                 u32 *result, unsigned timeout)
 157 {
 158         bool write = cmd->common.opcode & 1;
 159         struct nvme_ns *ns = q->queuedata;
 160         struct gendisk *disk = ns ? ns->disk : NULL;
 161         struct request *req;
 162         struct bio *bio = NULL;
 163         void *meta = NULL;
 164         int ret;
 165
 166         req = nvme_alloc_request(q, cmd, 0);
 167         if (IS_ERR(req))
 168                 return PTR_ERR(req);
 169
 170         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 171
 172         if (ubuffer && bufflen) {
 173                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
 174                                 GFP_KERNEL);
 175                 if (ret)
 176                         goto out;
 177                 bio = req->bio;
 178
 179                 if (!disk)
 180                         goto submit;
 181                 bio->bi_bdev = bdget_disk(disk, 0);
 182                 if (!bio->bi_bdev) {
 183                         ret = -ENODEV;
 184                         goto out_unmap;
 185                 }
 186
 187                 if (meta_buffer && meta_len) {
 188                         struct bio_integrity_payload *bip;
 189
 190                         meta = kmalloc(meta_len, GFP_KERNEL);
 191                         if (!meta) {
 192                                 ret = -ENOMEM;
 193                                 goto out_unmap;
 194                         }
 195
 196                         if (write) {
 197                                 if (copy_from_user(meta, meta_buffer,
 198                                                 meta_len)) {
 199                                         ret = -EFAULT;
 200                                         goto out_free_meta;
 201                                 }
 202                         }
 203
 204                         bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
 205                         if (IS_ERR(bip)) {
 206                                 ret = PTR_ERR(bip);
 207                                 goto out_free_meta;
 208                         }
 209
 210                         bip->bip_iter.bi_size = meta_len;
 211                         bip->bip_iter.bi_sector = meta_seed;
 212
 213                         ret = bio_integrity_add_page(bio, virt_to_page(meta),
 214                                         meta_len, offset_in_page(meta));
 215                         if (ret != meta_len) {
 216                                 ret = -ENOMEM;
 217                                 goto out_free_meta;
 218                         }
 219                 }
 220         }
 221  submit:
 222         blk_execute_rq(req->q, disk, req, 0);
 223         ret = req->errors;
 224         if (result)
 225                 *result = (u32)(uintptr_t)req->special;
 226         if (meta && !ret && !write) {
 227                 if (copy_to_user(meta_buffer, meta, meta_len))
 228                         ret = -EFAULT;
 229         }
 230  out_free_meta:
 231         kfree(meta);
 232  out_unmap:
 233         if (bio) {
 234                 if (disk && bio->bi_bdev)
 235                         bdput(bio->bi_bdev);
 236                 blk_rq_unmap_user(bio);
 237         }
 238  out:
 239         blk_mq_free_request(req);
 240         return ret;
 241 }
 242
 243 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 244                 void __user *ubuffer, unsigned bufflen, u32 *result,
 245                 unsigned timeout)
 246 {
 247         return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
 248                         result, timeout);
 249 }
 250
 251 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 252 {
 253         struct nvme_command c = { };
 254         int error;
 255
 256         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 257         c.identify.opcode = nvme_admin_identify;
 258         c.identify.cns = cpu_to_le32(1);
 259
 260         *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
 261         if (!*id)
 262                 return -ENOMEM;
 263
 264         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 265                         sizeof(struct nvme_id_ctrl));
 266         if (error)
 267                 kfree(*id);
 268         return error;
 269 }
 270
 271 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
 272 {
 273         struct nvme_command c = { };
 274
 275         c.identify.opcode = nvme_admin_identify;
 276         c.identify.cns = cpu_to_le32(2);
 277         c.identify.nsid = cpu_to_le32(nsid);
 278         return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
 279 }
 280
 281 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 282                 struct nvme_id_ns **id)
 283 {
 284         struct nvme_command c = { };
 285         int error;
 286
 287         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 288         c.identify.opcode = nvme_admin_identify,
 289         c.identify.nsid = cpu_to_le32(nsid),
 290
 291         *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 292         if (!*id)
 293                 return -ENOMEM;
 294
 295         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 296                         sizeof(struct nvme_id_ns));
 297         if (error)
 298                 kfree(*id);
 299         return error;
 300 }
 301
 302 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 303                                         dma_addr_t dma_addr, u32 *result)
 304 {
 305         struct nvme_command c;
 306
 307         memset(&c, 0, sizeof(c));
 308         c.features.opcode = nvme_admin_get_features;
 309         c.features.nsid = cpu_to_le32(nsid);
 310         c.features.prp1 = cpu_to_le64(dma_addr);
 311         c.features.fid = cpu_to_le32(fid);
 312
 313         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
 314 }
 315
 316 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 317                                         dma_addr_t dma_addr, u32 *result)
 318 {
 319         struct nvme_command c;
 320
 321         memset(&c, 0, sizeof(c));
 322         c.features.opcode = nvme_admin_set_features;
 323         c.features.prp1 = cpu_to_le64(dma_addr);
 324         c.features.fid = cpu_to_le32(fid);
 325         c.features.dword11 = cpu_to_le32(dword11);
 326
 327         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
 328 }
 329
 330 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
 331 {
 332         struct nvme_command c = { };
 333         int error;
 334
 335         c.common.opcode = nvme_admin_get_log_page,
 336         c.common.nsid = cpu_to_le32(0xFFFFFFFF),
 337         c.common.cdw10[0] = cpu_to_le32(
 338                         (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 339                          NVME_LOG_SMART),
 340
 341         *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 342         if (!*log)
 343                 return -ENOMEM;
 344
 345         error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
 346                         sizeof(struct nvme_smart_log));
 347         if (error)
 348                 kfree(*log);
 349         return error;
 350 }
 351
 352 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
 353 {
 354         u32 q_count = (*count - 1) | ((*count - 1) << 16);
 355         u32 result;
 356         int status, nr_io_queues;
 357
 358         status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
 359                         &result);
 360         if (status)
 361                 return status;
 362
 363         nr_io_queues = min(result & 0xffff, result >> 16) + 1;
 364         *count = min(*count, nr_io_queues);
 365         return 0;
 366 }
 367
 368 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 369 {
 370         struct nvme_user_io io;
 371         struct nvme_command c;
 372         unsigned length, meta_len;
 373         void __user *metadata;
 374
 375         if (copy_from_user(&io, uio, sizeof(io)))
 376                 return -EFAULT;
 377         if (io.flags)
 378                 return -EINVAL;
 379
 380         switch (io.opcode) {
 381         case nvme_cmd_write:
 382         case nvme_cmd_read:
 383         case nvme_cmd_compare:
 384                 break;
 385         default:
 386                 return -EINVAL;
 387         }
 388
 389         length = (io.nblocks + 1) << ns->lba_shift;
 390         meta_len = (io.nblocks + 1) * ns->ms;
 391         metadata = (void __user *)(uintptr_t)io.metadata;
 392
 393         if (ns->ext) {
 394                 length += meta_len;
 395                 meta_len = 0;
 396         } else if (meta_len) {
 397                 if ((io.metadata & 3) || !io.metadata)
 398                         return -EINVAL;
 399         }
 400
 401         memset(&c, 0, sizeof(c));
 402         c.rw.opcode = io.opcode;
 403         c.rw.flags = io.flags;
 404         c.rw.nsid = cpu_to_le32(ns->ns_id);
 405         c.rw.slba = cpu_to_le64(io.slba);
 406         c.rw.length = cpu_to_le16(io.nblocks);
 407         c.rw.control = cpu_to_le16(io.control);
 408         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
 409         c.rw.reftag = cpu_to_le32(io.reftag);
 410         c.rw.apptag = cpu_to_le16(io.apptag);
 411         c.rw.appmask = cpu_to_le16(io.appmask);
 412
 413         return __nvme_submit_user_cmd(ns->queue, &c,
 414                         (void __user *)(uintptr_t)io.addr, length,
 415                         metadata, meta_len, io.slba, NULL, 0);
 416 }
 417
 418 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 419                         struct nvme_passthru_cmd __user *ucmd)
 420 {
 421         struct nvme_passthru_cmd cmd;
 422         struct nvme_command c;
 423         unsigned timeout = 0;
 424         int status;
 425
 426         if (!capable(CAP_SYS_ADMIN))
 427                 return -EACCES;
 428         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 429                 return -EFAULT;
 430         if (cmd.flags)
 431                 return -EINVAL;
 432
 433         memset(&c, 0, sizeof(c));
 434         c.common.opcode = cmd.opcode;
 435         c.common.flags = cmd.flags;
 436         c.common.nsid = cpu_to_le32(cmd.nsid);
 437         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 438         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 439         c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
 440         c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
 441         c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
 442         c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
 443         c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
 444         c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
 445
 446         if (cmd.timeout_ms)
 447                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 448
 449         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 450                         (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
 451                         &cmd.result, timeout);
 452         if (status >= 0) {
 453                 if (put_user(cmd.result, &ucmd->result))
 454                         return -EFAULT;
 455         }
 456
 457         return status;
 458 }
 459
 460 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 461                 unsigned int cmd, unsigned long arg)
 462 {
 463         struct nvme_ns *ns = bdev->bd_disk->private_data;
 464
 465         switch (cmd) {
 466         case NVME_IOCTL_ID:
 467                 force_successful_syscall_return();
 468                 return ns->ns_id;
 469         case NVME_IOCTL_ADMIN_CMD:
 470                 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
 471         case NVME_IOCTL_IO_CMD:
 472                 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
 473         case NVME_IOCTL_SUBMIT_IO:
 474                 return nvme_submit_io(ns, (void __user *)arg);
 475 #ifdef CONFIG_BLK_DEV_NVME_SCSI
 476         case SG_GET_VERSION_NUM:
 477                 return nvme_sg_get_version_num((void __user *)arg);
 478         case SG_IO:
 479                 return nvme_sg_io(ns, (void __user *)arg);
 480 #endif
 481         default:
 482                 return -ENOTTY;
 483         }
 484 }
 485
 486 #ifdef CONFIG_COMPAT
 487 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
 488                         unsigned int cmd, unsigned long arg)
 489 {
 490         switch (cmd) {
 491         case SG_IO:
 492                 return -ENOIOCTLCMD;
 493         }
 494         return nvme_ioctl(bdev, mode, cmd, arg);
 495 }
 496 #else
 497 #define nvme_compat_ioctl       NULL
 498 #endif
 499
 500 static int nvme_open(struct block_device *bdev, fmode_t mode)
 501 {
 502         return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
 503 }
 504
 505 static void nvme_release(struct gendisk *disk, fmode_t mode)
 506 {
 507         nvme_put_ns(disk->private_data);
 508 }
 509
 510 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 511 {
 512         /* some standard values */
 513         geo->heads = 1 << 6;
 514         geo->sectors = 1 << 5;
 515         geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
 516         return 0;
 517 }
 518
 519 #ifdef CONFIG_BLK_DEV_INTEGRITY
 520 static void nvme_init_integrity(struct nvme_ns *ns)
 521 {
 522         struct blk_integrity integrity;
 523
 524         switch (ns->pi_type) {
 525         case NVME_NS_DPS_PI_TYPE3:
 526                 integrity.profile = &t10_pi_type3_crc;
 527                 break;
 528         case NVME_NS_DPS_PI_TYPE1:
 529         case NVME_NS_DPS_PI_TYPE2:
 530                 integrity.profile = &t10_pi_type1_crc;
 531                 break;
 532         default:
 533                 integrity.profile = NULL;
 534                 break;
 535         }
 536         integrity.tuple_size = ns->ms;
 537         blk_integrity_register(ns->disk, &integrity);
 538         blk_queue_max_integrity_segments(ns->queue, 1);
 539 }
 540 #else
 541 static void nvme_init_integrity(struct nvme_ns *ns)
 542 {
 543 }
 544 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 545
 546 static void nvme_config_discard(struct nvme_ns *ns)
 547 {
 548         u32 logical_block_size = queue_logical_block_size(ns->queue);
 549         ns->queue->limits.discard_zeroes_data = 0;
 550         ns->queue->limits.discard_alignment = logical_block_size;
 551         ns->queue->limits.discard_granularity = logical_block_size;
 552         blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
 553         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
 554 }
 555
 556 static int nvme_revalidate_disk(struct gendisk *disk)
 557 {
 558         struct nvme_ns *ns = disk->private_data;
 559         struct nvme_id_ns *id;
 560         u8 lbaf, pi_type;
 561         u16 old_ms;
 562         unsigned short bs;
 563
 564         if (test_bit(NVME_NS_DEAD, &ns->flags)) {
 565                 set_capacity(disk, 0);
 566                 return -ENODEV;
 567         }
 568         if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
 569                 dev_warn(ns->ctrl->dev, "%s: Identify failure nvme%dn%d\n",
 570                                 __func__, ns->ctrl->instance, ns->ns_id);
 571                 return -ENODEV;
 572         }
 573         if (id->ncap == 0) {
 574                 kfree(id);
 575                 return -ENODEV;
 576         }
 577
 578         if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
 579                 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
 580                         dev_warn(ns->ctrl->dev,
 581                                 "%s: LightNVM init failure\n", __func__);
 582                         kfree(id);
 583                         return -ENODEV;
 584                 }
 585                 ns->type = NVME_NS_LIGHTNVM;
 586         }
 587
 588         if (ns->ctrl->vs >= NVME_VS(1, 1))
 589                 memcpy(ns->eui, id->eui64, sizeof(ns->eui));
 590         if (ns->ctrl->vs >= NVME_VS(1, 2))
 591                 memcpy(ns->uuid, id->nguid, sizeof(ns->uuid));
 592
 593         old_ms = ns->ms;
 594         lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
 595         ns->lba_shift = id->lbaf[lbaf].ds;
 596         ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
 597         ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
 598
 599         /*
 600          * If identify namespace failed, use default 512 byte block size so
 601          * block layer can use before failing read/write for 0 capacity.
 602          */
 603         if (ns->lba_shift == 0)
 604                 ns->lba_shift = 9;
 605         bs = 1 << ns->lba_shift;
 606         /* XXX: PI implementation requires metadata equal t10 pi tuple size */
 607         pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
 608                                         id->dps & NVME_NS_DPS_PI_MASK : 0;
 609
 610         blk_mq_freeze_queue(disk->queue);
 611         if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
 612                                 ns->ms != old_ms ||
 613                                 bs != queue_logical_block_size(disk->queue) ||
 614                                 (ns->ms && ns->ext)))
 615                 blk_integrity_unregister(disk);
 616
 617         ns->pi_type = pi_type;
 618         blk_queue_logical_block_size(ns->queue, bs);
 619
 620         if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
 621                 nvme_init_integrity(ns);
 622         if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
 623                 set_capacity(disk, 0);
 624         else
 625                 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
 626
 627         if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
 628                 nvme_config_discard(ns);
 629         blk_mq_unfreeze_queue(disk->queue);
 630
 631         kfree(id);
 632         return 0;
 633 }
 634
 635 static char nvme_pr_type(enum pr_type type)
 636 {
 637         switch (type) {
 638         case PR_WRITE_EXCLUSIVE:
 639                 return 1;
 640         case PR_EXCLUSIVE_ACCESS:
 641                 return 2;
 642         case PR_WRITE_EXCLUSIVE_REG_ONLY:
 643                 return 3;
 644         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
 645                 return 4;
 646         case PR_WRITE_EXCLUSIVE_ALL_REGS:
 647                 return 5;
 648         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
 649                 return 6;
 650         default:
 651                 return 0;
 652         }
 653 };
 654
 655 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 656                                 u64 key, u64 sa_key, u8 op)
 657 {
 658         struct nvme_ns *ns = bdev->bd_disk->private_data;
 659         struct nvme_command c;
 660         u8 data[16] = { 0, };
 661
 662         put_unaligned_le64(key, &data[0]);
 663         put_unaligned_le64(sa_key, &data[8]);
 664
 665         memset(&c, 0, sizeof(c));
 666         c.common.opcode = op;
 667         c.common.nsid = cpu_to_le32(ns->ns_id);
 668         c.common.cdw10[0] = cpu_to_le32(cdw10);
 669
 670         return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
 671 }
 672
 673 static int nvme_pr_register(struct block_device *bdev, u64 old,
 674                 u64 new, unsigned flags)
 675 {
 676         u32 cdw10;
 677
 678         if (flags & ~PR_FL_IGNORE_KEY)
 679                 return -EOPNOTSUPP;
 680
 681         cdw10 = old ? 2 : 0;
 682         cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
 683         cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
 684         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
 685 }
 686
 687 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
 688                 enum pr_type type, unsigned flags)
 689 {
 690         u32 cdw10;
 691
 692         if (flags & ~PR_FL_IGNORE_KEY)
 693                 return -EOPNOTSUPP;
 694
 695         cdw10 = nvme_pr_type(type) << 8;
 696         cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
 697         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
 698 }
 699
 700 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
 701                 enum pr_type type, bool abort)
 702 {
 703         u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
 704         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
 705 }
 706
 707 static int nvme_pr_clear(struct block_device *bdev, u64 key)
 708 {
 709         u32 cdw10 = 1 | (key ? 1 << 3 : 0);
 710         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
 711 }
 712
 713 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
 714 {
 715         u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
 716         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
 717 }
 718
 719 static const struct pr_ops nvme_pr_ops = {
 720         .pr_register    = nvme_pr_register,
 721         .pr_reserve     = nvme_pr_reserve,
 722         .pr_release     = nvme_pr_release,
 723         .pr_preempt     = nvme_pr_preempt,
 724         .pr_clear       = nvme_pr_clear,
 725 };
 726
 727 static const struct block_device_operations nvme_fops = {
 728         .owner          = THIS_MODULE,
 729         .ioctl          = nvme_ioctl,
 730         .compat_ioctl   = nvme_compat_ioctl,
 731         .open           = nvme_open,
 732         .release        = nvme_release,
 733         .getgeo         = nvme_getgeo,
 734         .revalidate_disk= nvme_revalidate_disk,
 735         .pr_ops         = &nvme_pr_ops,
 736 };
 737
 738 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
 739 {
 740         unsigned long timeout =
 741                 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
 742         u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
 743         int ret;
 744
 745         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
 746                 if ((csts & NVME_CSTS_RDY) == bit)
 747                         break;
 748
 749                 msleep(100);
 750                 if (fatal_signal_pending(current))
 751                         return -EINTR;
 752                 if (time_after(jiffies, timeout)) {
 753                         dev_err(ctrl->dev,
 754                                 "Device not ready; aborting %s\n", enabled ?
 755                                                 "initialisation" : "reset");
 756                         return -ENODEV;
 757                 }
 758         }
 759
 760         return ret;
 761 }
 762
 763 /*
 764  * If the device has been passed off to us in an enabled state, just clear
 765  * the enabled bit.  The spec says we should set the 'shutdown notification
 766  * bits', but doing so may cause the device to complete commands to the
 767  * admin queue ... and we don't know what memory that might be pointing at!
 768  */
 769 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
 770 {
 771         int ret;
 772
 773         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
 774         ctrl->ctrl_config &= ~NVME_CC_ENABLE;
 775
 776         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 777         if (ret)
 778                 return ret;
 779         return nvme_wait_ready(ctrl, cap, false);
 780 }
 781
 782 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
 783 {
 784         /*
 785          * Default to a 4K page size, with the intention to update this
 786          * path in the future to accomodate architectures with differing
 787          * kernel and IO page sizes.
 788          */
 789         unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
 790         int ret;
 791
 792         if (page_shift < dev_page_min) {
 793                 dev_err(ctrl->dev,
 794                         "Minimum device page size %u too large for host (%u)\n",
 795                         1 << dev_page_min, 1 << page_shift);
 796                 return -ENODEV;
 797         }
 798
 799         ctrl->page_size = 1 << page_shift;
 800
 801         ctrl->ctrl_config = NVME_CC_CSS_NVM;
 802         ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
 803         ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
 804         ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
 805         ctrl->ctrl_config |= NVME_CC_ENABLE;
 806
 807         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 808         if (ret)
 809                 return ret;
 810         return nvme_wait_ready(ctrl, cap, true);
 811 }
 812
 813 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
 814 {
 815         unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
 816         u32 csts;
 817         int ret;
 818
 819         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
 820         ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
 821
 822         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 823         if (ret)
 824                 return ret;
 825
 826         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
 827                 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
 828                         break;
 829
 830                 msleep(100);
 831                 if (fatal_signal_pending(current))
 832                         return -EINTR;
 833                 if (time_after(jiffies, timeout)) {
 834                         dev_err(ctrl->dev,
 835                                 "Device shutdown incomplete; abort shutdown\n");
 836                         return -ENODEV;
 837                 }
 838         }
 839
 840         return ret;
 841 }
 842
 843 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 844                 struct request_queue *q)
 845 {
 846         if (ctrl->max_hw_sectors) {
 847                 u32 max_segments =
 848                         (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
 849
 850                 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
 851                 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
 852         }
 853         if (ctrl->stripe_size)
 854                 blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9);
 855         if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
 856                 blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
 857         blk_queue_virt_boundary(q, ctrl->page_size - 1);
 858 }
 859
 860 /*
 861  * Initialize the cached copies of the Identify data and various controller
 862  * register in our nvme_ctrl structure.  This should be called as soon as
 863  * the admin queue is fully up and running.
 864  */
 865 int nvme_init_identify(struct nvme_ctrl *ctrl)
 866 {
 867         struct nvme_id_ctrl *id;
 868         u64 cap;
 869         int ret, page_shift;
 870
 871         ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
 872         if (ret) {
 873                 dev_err(ctrl->dev, "Reading VS failed (%d)\n", ret);
 874                 return ret;
 875         }
 876
 877         ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
 878         if (ret) {
 879                 dev_err(ctrl->dev, "Reading CAP failed (%d)\n", ret);
 880                 return ret;
 881         }
 882         page_shift = NVME_CAP_MPSMIN(cap) + 12;
 883
 884         if (ctrl->vs >= NVME_VS(1, 1))
 885                 ctrl->subsystem = NVME_CAP_NSSRC(cap);
 886
 887         ret = nvme_identify_ctrl(ctrl, &id);
 888         if (ret) {
 889                 dev_err(ctrl->dev, "Identify Controller failed (%d)\n", ret);
 890                 return -EIO;
 891         }
 892
 893         ctrl->oncs = le16_to_cpup(&id->oncs);
 894         atomic_set(&ctrl->abort_limit, id->acl + 1);
 895         ctrl->vwc = id->vwc;
 896         memcpy(ctrl->serial, id->sn, sizeof(id->sn));
 897         memcpy(ctrl->model, id->mn, sizeof(id->mn));
 898         memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
 899         if (id->mdts)
 900                 ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
 901         else
 902                 ctrl->max_hw_sectors = UINT_MAX;
 903
 904         if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
 905                 unsigned int max_hw_sectors;
 906
 907                 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
 908                 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
 909                 if (ctrl->max_hw_sectors) {
 910                         ctrl->max_hw_sectors = min(max_hw_sectors,
 911                                                         ctrl->max_hw_sectors);
 912                 } else {
 913                         ctrl->max_hw_sectors = max_hw_sectors;
 914                 }
 915         }
 916
 917         nvme_set_queue_limits(ctrl, ctrl->admin_q);
 918
 919         kfree(id);
 920         return 0;
 921 }
 922
 923 static int nvme_dev_open(struct inode *inode, struct file *file)
 924 {
 925         struct nvme_ctrl *ctrl;
 926         int instance = iminor(inode);
 927         int ret = -ENODEV;
 928
 929         spin_lock(&dev_list_lock);
 930         list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
 931                 if (ctrl->instance != instance)
 932                         continue;
 933
 934                 if (!ctrl->admin_q) {
 935                         ret = -EWOULDBLOCK;
 936                         break;
 937                 }
 938                 if (!kref_get_unless_zero(&ctrl->kref))
 939                         break;
 940                 file->private_data = ctrl;
 941                 ret = 0;
 942                 break;
 943         }
 944         spin_unlock(&dev_list_lock);
 945
 946         return ret;
 947 }
 948
 949 static int nvme_dev_release(struct inode *inode, struct file *file)
 950 {
 951         nvme_put_ctrl(file->private_data);
 952         return 0;
 953 }
 954
 955 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
 956 {
 957         struct nvme_ns *ns;
 958         int ret;
 959
 960         mutex_lock(&ctrl->namespaces_mutex);
 961         if (list_empty(&ctrl->namespaces)) {
 962                 ret = -ENOTTY;
 963                 goto out_unlock;
 964         }
 965
 966         ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
 967         if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
 968                 dev_warn(ctrl->dev,
 969                         "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
 970                 ret = -EINVAL;
 971                 goto out_unlock;
 972         }
 973
 974         dev_warn(ctrl->dev,
 975                 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
 976         kref_get(&ns->kref);
 977         mutex_unlock(&ctrl->namespaces_mutex);
 978
 979         ret = nvme_user_cmd(ctrl, ns, argp);
 980         nvme_put_ns(ns);
 981         return ret;
 982
 983 out_unlock:
 984         mutex_unlock(&ctrl->namespaces_mutex);
 985         return ret;
 986 }
 987
 988 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 989                 unsigned long arg)
 990 {
 991         struct nvme_ctrl *ctrl = file->private_data;
 992         void __user *argp = (void __user *)arg;
 993
 994         switch (cmd) {
 995         case NVME_IOCTL_ADMIN_CMD:
 996                 return nvme_user_cmd(ctrl, NULL, argp);
 997         case NVME_IOCTL_IO_CMD:
 998                 return nvme_dev_user_cmd(ctrl, argp);
 999         case NVME_IOCTL_RESET:
1000                 dev_warn(ctrl->dev, "resetting controller\n");
1001                 return ctrl->ops->reset_ctrl(ctrl);
1002         case NVME_IOCTL_SUBSYS_RESET:
1003                 return nvme_reset_subsystem(ctrl);
1004         default:
1005                 return -ENOTTY;
1006         }
1007 }
1008
1009 static const struct file_operations nvme_dev_fops = {
1010         .owner          = THIS_MODULE,
1011         .open           = nvme_dev_open,
1012         .release        = nvme_dev_release,
1013         .unlocked_ioctl = nvme_dev_ioctl,
1014         .compat_ioctl   = nvme_dev_ioctl,
1015 };
1016
1017 static ssize_t nvme_sysfs_reset(struct device *dev,
1018                                 struct device_attribute *attr, const char *buf,
1019                                 size_t count)
1020 {
1021         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1022         int ret;
1023
1024         ret = ctrl->ops->reset_ctrl(ctrl);
1025         if (ret < 0)
1026                 return ret;
1027         return count;
1028 }
1029 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
1030
1031 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
1032                                                                 char *buf)
1033 {
1034         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1035         return sprintf(buf, "%pU\n", ns->uuid);
1036 }
1037 static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
1038
1039 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
1040                                                                 char *buf)
1041 {
1042         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1043         return sprintf(buf, "%8phd\n", ns->eui);
1044 }
1045 static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
1046
1047 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
1048                                                                 char *buf)
1049 {
1050         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1051         return sprintf(buf, "%d\n", ns->ns_id);
1052 }
1053 static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
1054
1055 static struct attribute *nvme_ns_attrs[] = {
1056         &dev_attr_uuid.attr,
1057         &dev_attr_eui.attr,
1058         &dev_attr_nsid.attr,
1059         NULL,
1060 };
1061
1062 static umode_t nvme_attrs_are_visible(struct kobject *kobj,
1063                 struct attribute *a, int n)
1064 {
1065         struct device *dev = container_of(kobj, struct device, kobj);
1066         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1067
1068         if (a == &dev_attr_uuid.attr) {
1069                 if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1070                         return 0;
1071         }
1072         if (a == &dev_attr_eui.attr) {
1073                 if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1074                         return 0;
1075         }
1076         return a->mode;
1077 }
1078
1079 static const struct attribute_group nvme_ns_attr_group = {
1080         .attrs          = nvme_ns_attrs,
1081         .is_visible     = nvme_attrs_are_visible,
1082 };
1083
1084 #define nvme_show_function(field)                                               \
1085 static ssize_t  field##_show(struct device *dev,                                \
1086                             struct device_attribute *attr, char *buf)           \
1087 {                                                                               \
1088         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);                          \
1089         return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field);   \
1090 }                                                                               \
1091 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1092
1093 nvme_show_function(model);
1094 nvme_show_function(serial);
1095 nvme_show_function(firmware_rev);
1096
1097 static struct attribute *nvme_dev_attrs[] = {
1098         &dev_attr_reset_controller.attr,
1099         &dev_attr_model.attr,
1100         &dev_attr_serial.attr,
1101         &dev_attr_firmware_rev.attr,
1102         NULL
1103 };
1104
1105 static struct attribute_group nvme_dev_attrs_group = {
1106         .attrs = nvme_dev_attrs,
1107 };
1108
1109 static const struct attribute_group *nvme_dev_attr_groups[] = {
1110         &nvme_dev_attrs_group,
1111         NULL,
1112 };
1113
1114 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
1115 {
1116         struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
1117         struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
1118
1119         return nsa->ns_id - nsb->ns_id;
1120 }
1121
1122 static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1123 {
1124         struct nvme_ns *ns;
1125
1126         lockdep_assert_held(&ctrl->namespaces_mutex);
1127
1128         list_for_each_entry(ns, &ctrl->namespaces, list) {
1129                 if (ns->ns_id == nsid)
1130                         return ns;
1131                 if (ns->ns_id > nsid)
1132                         break;
1133         }
1134         return NULL;
1135 }
1136
1137 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1138 {
1139         struct nvme_ns *ns;
1140         struct gendisk *disk;
1141         int node = dev_to_node(ctrl->dev);
1142
1143         lockdep_assert_held(&ctrl->namespaces_mutex);
1144
1145         ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
1146         if (!ns)
1147                 return;
1148
1149         ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
1150         if (ns->instance < 0)
1151                 goto out_free_ns;
1152
1153         ns->queue = blk_mq_init_queue(ctrl->tagset);
1154         if (IS_ERR(ns->queue))
1155                 goto out_release_instance;
1156         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1157         ns->queue->queuedata = ns;
1158         ns->ctrl = ctrl;
1159
1160         disk = alloc_disk_node(0, node);
1161         if (!disk)
1162                 goto out_free_queue;
1163
1164         kref_init(&ns->kref);
1165         ns->ns_id = nsid;
1166         ns->disk = disk;
1167         ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1168
1169
1170         blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1171         nvme_set_queue_limits(ctrl, ns->queue);
1172
1173         disk->major = nvme_major;
1174         disk->first_minor = 0;
1175         disk->fops = &nvme_fops;
1176         disk->private_data = ns;
1177         disk->queue = ns->queue;
1178         disk->driverfs_dev = ctrl->device;
1179         disk->flags = GENHD_FL_EXT_DEVT;
1180         sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1181
1182         if (nvme_revalidate_disk(ns->disk))
1183                 goto out_free_disk;
1184
1185         list_add_tail(&ns->list, &ctrl->namespaces);
1186         kref_get(&ctrl->kref);
1187         if (ns->type == NVME_NS_LIGHTNVM)
1188                 return;
1189
1190         add_disk(ns->disk);
1191         if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
1192                                         &nvme_ns_attr_group))
1193                 pr_warn("%s: failed to create sysfs group for identification\n",
1194                         ns->disk->disk_name);
1195         return;
1196  out_free_disk:
1197         kfree(disk);
1198  out_free_queue:
1199         blk_cleanup_queue(ns->queue);
1200  out_release_instance:
1201         ida_simple_remove(&ctrl->ns_ida, ns->instance);
1202  out_free_ns:
1203         kfree(ns);
1204 }
1205
1206 static void nvme_ns_remove(struct nvme_ns *ns)
1207 {
1208         if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
1209                 return;
1210
1211         if (ns->disk->flags & GENHD_FL_UP) {
1212                 if (blk_get_integrity(ns->disk))
1213                         blk_integrity_unregister(ns->disk);
1214                 sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
1215                                         &nvme_ns_attr_group);
1216                 del_gendisk(ns->disk);
1217                 blk_mq_abort_requeue_list(ns->queue);
1218                 blk_cleanup_queue(ns->queue);
1219         }
1220         mutex_lock(&ns->ctrl->namespaces_mutex);
1221         list_del_init(&ns->list);
1222         mutex_unlock(&ns->ctrl->namespaces_mutex);
1223         nvme_put_ns(ns);
1224 }
1225
1226 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1227 {
1228         struct nvme_ns *ns;
1229
1230         ns = nvme_find_ns(ctrl, nsid);
1231         if (ns) {
1232                 if (revalidate_disk(ns->disk))
1233                         nvme_ns_remove(ns);
1234         } else
1235                 nvme_alloc_ns(ctrl, nsid);
1236 }
1237
1238 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1239 {
1240         struct nvme_ns *ns;
1241         __le32 *ns_list;
1242         unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1243         int ret = 0;
1244
1245         ns_list = kzalloc(0x1000, GFP_KERNEL);
1246         if (!ns_list)
1247                 return -ENOMEM;
1248
1249         for (i = 0; i < num_lists; i++) {
1250                 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1251                 if (ret)
1252                         goto out;
1253
1254                 for (j = 0; j < min(nn, 1024U); j++) {
1255                         nsid = le32_to_cpu(ns_list[j]);
1256                         if (!nsid)
1257                                 goto out;
1258
1259                         nvme_validate_ns(ctrl, nsid);
1260
1261                         while (++prev < nsid) {
1262                                 ns = nvme_find_ns(ctrl, prev);
1263                                 if (ns)
1264                                         nvme_ns_remove(ns);
1265                         }
1266                 }
1267                 nn -= j;
1268         }
1269  out:
1270         kfree(ns_list);
1271         return ret;
1272 }
1273
1274 static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn)
1275 {
1276         struct nvme_ns *ns, *next;
1277         unsigned i;
1278
1279         lockdep_assert_held(&ctrl->namespaces_mutex);
1280
1281         for (i = 1; i <= nn; i++)
1282                 nvme_validate_ns(ctrl, i);
1283
1284         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1285                 if (ns->ns_id > nn)
1286                         nvme_ns_remove(ns);
1287         }
1288 }
1289
1290 void nvme_scan_namespaces(struct nvme_ctrl *ctrl)
1291 {
1292         struct nvme_id_ctrl *id;
1293         unsigned nn;
1294
1295         if (nvme_identify_ctrl(ctrl, &id))
1296                 return;
1297
1298         mutex_lock(&ctrl->namespaces_mutex);
1299         nn = le32_to_cpu(id->nn);
1300         if (ctrl->vs >= NVME_VS(1, 1) &&
1301             !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1302                 if (!nvme_scan_ns_list(ctrl, nn))
1303                         goto done;
1304         }
1305         __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn));
1306  done:
1307         list_sort(NULL, &ctrl->namespaces, ns_cmp);
1308         mutex_unlock(&ctrl->namespaces_mutex);
1309         kfree(id);
1310 }
1311
1312 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1313 {
1314         struct nvme_ns *ns, *next;
1315
1316         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1317                 nvme_ns_remove(ns);
1318 }
1319
1320 static DEFINE_IDA(nvme_instance_ida);
1321
1322 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1323 {
1324         int instance, error;
1325
1326         do {
1327                 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1328                         return -ENODEV;
1329
1330                 spin_lock(&dev_list_lock);
1331                 error = ida_get_new(&nvme_instance_ida, &instance);
1332                 spin_unlock(&dev_list_lock);
1333         } while (error == -EAGAIN);
1334
1335         if (error)
1336                 return -ENODEV;
1337
1338         ctrl->instance = instance;
1339         return 0;
1340 }
1341
1342 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1343 {
1344         spin_lock(&dev_list_lock);
1345         ida_remove(&nvme_instance_ida, ctrl->instance);
1346         spin_unlock(&dev_list_lock);
1347 }
1348
1349 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1350  {
1351         device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1352
1353         spin_lock(&dev_list_lock);
1354         list_del(&ctrl->node);
1355         spin_unlock(&dev_list_lock);
1356 }
1357
1358 static void nvme_free_ctrl(struct kref *kref)
1359 {
1360         struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1361
1362         put_device(ctrl->device);
1363         nvme_release_instance(ctrl);
1364         ida_destroy(&ctrl->ns_ida);
1365
1366         ctrl->ops->free_ctrl(ctrl);
1367 }
1368
1369 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1370 {
1371         kref_put(&ctrl->kref, nvme_free_ctrl);
1372 }
1373
1374 /*
1375  * Initialize a NVMe controller structures.  This needs to be called during
1376  * earliest initialization so that we have the initialized structured around
1377  * during probing.
1378  */
1379 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1380                 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1381 {
1382         int ret;
1383
1384         INIT_LIST_HEAD(&ctrl->namespaces);
1385         mutex_init(&ctrl->namespaces_mutex);
1386         kref_init(&ctrl->kref);
1387         ctrl->dev = dev;
1388         ctrl->ops = ops;
1389         ctrl->quirks = quirks;
1390
1391         ret = nvme_set_instance(ctrl);
1392         if (ret)
1393                 goto out;
1394
1395         ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
1396                                 MKDEV(nvme_char_major, ctrl->instance),
1397                                 dev, nvme_dev_attr_groups,
1398                                 "nvme%d", ctrl->instance);
1399         if (IS_ERR(ctrl->device)) {
1400                 ret = PTR_ERR(ctrl->device);
1401                 goto out_release_instance;
1402         }
1403         get_device(ctrl->device);
1404         dev_set_drvdata(ctrl->device, ctrl);
1405         ida_init(&ctrl->ns_ida);
1406
1407         spin_lock(&dev_list_lock);
1408         list_add_tail(&ctrl->node, &nvme_ctrl_list);
1409         spin_unlock(&dev_list_lock);
1410
1411         return 0;
1412 out_release_instance:
1413         nvme_release_instance(ctrl);
1414 out:
1415         return ret;
1416 }
1417
1418 /**
1419  * nvme_kill_queues(): Ends all namespace queues
1420  * @ctrl: the dead controller that needs to end
1421  *
1422  * Call this function when the driver determines it is unable to get the
1423  * controller in a state capable of servicing IO.
1424  */
1425 void nvme_kill_queues(struct nvme_ctrl *ctrl)
1426 {
1427         struct nvme_ns *ns;
1428
1429         mutex_lock(&ctrl->namespaces_mutex);
1430         list_for_each_entry(ns, &ctrl->namespaces, list) {
1431                 if (!kref_get_unless_zero(&ns->kref))
1432                         continue;
1433
1434                 /*
1435                  * Revalidating a dead namespace sets capacity to 0. This will
1436                  * end buffered writers dirtying pages that can't be synced.
1437                  */
1438                 if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags))
1439                         revalidate_disk(ns->disk);
1440
1441                 blk_set_queue_dying(ns->queue);
1442                 blk_mq_abort_requeue_list(ns->queue);
1443                 blk_mq_start_stopped_hw_queues(ns->queue, true);
1444
1445                 nvme_put_ns(ns);
1446         }
1447         mutex_unlock(&ctrl->namespaces_mutex);
1448 }
1449
1450 void nvme_stop_queues(struct nvme_ctrl *ctrl)
1451 {
1452         struct nvme_ns *ns;
1453
1454         mutex_lock(&ctrl->namespaces_mutex);
1455         list_for_each_entry(ns, &ctrl->namespaces, list) {
1456                 spin_lock_irq(ns->queue->queue_lock);
1457                 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
1458                 spin_unlock_irq(ns->queue->queue_lock);
1459
1460                 blk_mq_cancel_requeue_work(ns->queue);
1461                 blk_mq_stop_hw_queues(ns->queue);
1462         }
1463         mutex_unlock(&ctrl->namespaces_mutex);
1464 }
1465
1466 void nvme_start_queues(struct nvme_ctrl *ctrl)
1467 {
1468         struct nvme_ns *ns;
1469
1470         mutex_lock(&ctrl->namespaces_mutex);
1471         list_for_each_entry(ns, &ctrl->namespaces, list) {
1472                 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
1473                 blk_mq_start_stopped_hw_queues(ns->queue, true);
1474                 blk_mq_kick_requeue_list(ns->queue);
1475         }
1476         mutex_unlock(&ctrl->namespaces_mutex);
1477 }
1478
1479 int __init nvme_core_init(void)
1480 {
1481         int result;
1482
1483         result = register_blkdev(nvme_major, "nvme");
1484         if (result < 0)
1485                 return result;
1486         else if (result > 0)
1487                 nvme_major = result;
1488
1489         result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
1490                                                         &nvme_dev_fops);
1491         if (result < 0)
1492                 goto unregister_blkdev;
1493         else if (result > 0)
1494                 nvme_char_major = result;
1495
1496         nvme_class = class_create(THIS_MODULE, "nvme");
1497         if (IS_ERR(nvme_class)) {
1498                 result = PTR_ERR(nvme_class);
1499                 goto unregister_chrdev;
1500         }
1501
1502         return 0;
1503
1504  unregister_chrdev:
1505         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1506  unregister_blkdev:
1507         unregister_blkdev(nvme_major, "nvme");
1508         return result;
1509 }
1510
1511 void nvme_core_exit(void)
1512 {
1513         unregister_blkdev(nvme_major, "nvme");
1514         class_destroy(nvme_class);
1515         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1516 }