drivers/nvme/host/nvme.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2011-2014, Intel Corporation.
   4  */
   5
   6 #ifndef _NVME_H
   7 #define _NVME_H
   8
   9 #include <linux/nvme.h>
  10 #include <linux/cdev.h>
  11 #include <linux/pci.h>
  12 #include <linux/kref.h>
  13 #include <linux/blk-mq.h>
  14 #include <linux/lightnvm.h>
  15 #include <linux/sed-opal.h>
  16 #include <linux/fault-inject.h>
  17 #include <linux/rcupdate.h>
  18 #include <linux/wait.h>
  19
  20 #include <trace/events/block.h>
  21
  22 extern unsigned int nvme_io_timeout;
  23 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  24
  25 extern unsigned int admin_timeout;
  26 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  27
  28 #define NVME_DEFAULT_KATO       5
  29 #define NVME_KATO_GRACE         10
  30
  31 extern struct workqueue_struct *nvme_wq;
  32 extern struct workqueue_struct *nvme_reset_wq;
  33 extern struct workqueue_struct *nvme_delete_wq;
  34
  35 enum {
  36         NVME_NS_LBA             = 0,
  37         NVME_NS_LIGHTNVM        = 1,
  38 };
  39
  40 /*
  41  * List of workarounds for devices that required behavior not specified in
  42  * the standard.
  43  */
  44 enum nvme_quirks {
  45         /*
  46          * Prefers I/O aligned to a stripe size specified in a vendor
  47          * specific Identify field.
  48          */
  49         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  50
  51         /*
  52          * The controller doesn't handle Identify value others than 0 or 1
  53          * correctly.
  54          */
  55         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  56
  57         /*
  58          * The controller deterministically returns O's on reads to
  59          * logical blocks that deallocate was called on.
  60          */
  61         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  62
  63         /*
  64          * The controller needs a delay before starts checking the device
  65          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  66          */
  67         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  68
  69         /*
  70          * APST should not be used.
  71          */
  72         NVME_QUIRK_NO_APST                      = (1 << 4),
  73
  74         /*
  75          * The deepest sleep state should not be used.
  76          */
  77         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  78
  79         /*
  80          * Supports the LighNVM command set if indicated in vs[1].
  81          */
  82         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  83
  84         /*
  85          * Set MEDIUM priority on SQ creation
  86          */
  87         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
  88
  89         /*
  90          * Ignore device provided subnqn.
  91          */
  92         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
  93
  94         /*
  95          * Broken Write Zeroes.
  96          */
  97         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
  98
  99         /*
 100          * Force simple suspend/resume path.
 101          */
 102         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 103
 104         /*
 105          * Use only one interrupt vector for all queues
 106          */
 107         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 108
 109         /*
 110          * Use non-standard 128 bytes SQEs.
 111          */
 112         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 113
 114         /*
 115          * Prevent tag overlap between queues
 116          */
 117         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 118 };
 119
 120 /*
 121  * Common request structure for NVMe passthrough.  All drivers must have
 122  * this structure as the first member of their request-private data.
 123  */
 124 struct nvme_request {
 125         struct nvme_command     *cmd;
 126         union nvme_result       result;
 127         u8                      retries;
 128         u8                      flags;
 129         u16                     status;
 130         struct nvme_ctrl        *ctrl;
 131 };
 132
 133 /*
 134  * Mark a bio as coming in through the mpath node.
 135  */
 136 #define REQ_NVME_MPATH          REQ_DRV
 137
 138 enum {
 139         NVME_REQ_CANCELLED              = (1 << 0),
 140         NVME_REQ_USERCMD                = (1 << 1),
 141 };
 142
 143 static inline struct nvme_request *nvme_req(struct request *req)
 144 {
 145         return blk_mq_rq_to_pdu(req);
 146 }
 147
 148 static inline u16 nvme_req_qid(struct request *req)
 149 {
 150         if (!req->rq_disk)
 151                 return 0;
 152         return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1;
 153 }
 154
 155 /* The below value is the specific amount of delay needed before checking
 156  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 157  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 158  * found empirically.
 159  */
 160 #define NVME_QUIRK_DELAY_AMOUNT         2300
 161
 162 enum nvme_ctrl_state {
 163         NVME_CTRL_NEW,
 164         NVME_CTRL_LIVE,
 165         NVME_CTRL_RESETTING,
 166         NVME_CTRL_CONNECTING,
 167         NVME_CTRL_DELETING,
 168         NVME_CTRL_DEAD,
 169 };
 170
 171 struct nvme_fault_inject {
 172 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 173         struct fault_attr attr;
 174         struct dentry *parent;
 175         bool dont_retry;        /* DNR, do not retry */
 176         u16 status;             /* status code */
 177 #endif
 178 };
 179
 180 struct nvme_ctrl {
 181         bool comp_seen;
 182         enum nvme_ctrl_state state;
 183         bool identified;
 184         spinlock_t lock;
 185         struct mutex scan_lock;
 186         const struct nvme_ctrl_ops *ops;
 187         struct request_queue *admin_q;
 188         struct request_queue *connect_q;
 189         struct request_queue *fabrics_q;
 190         struct device *dev;
 191         int instance;
 192         int numa_node;
 193         struct blk_mq_tag_set *tagset;
 194         struct blk_mq_tag_set *admin_tagset;
 195         struct list_head namespaces;
 196         struct rw_semaphore namespaces_rwsem;
 197         struct device ctrl_device;
 198         struct device *device;  /* char device */
 199         struct cdev cdev;
 200         struct work_struct reset_work;
 201         struct work_struct delete_work;
 202         wait_queue_head_t state_wq;
 203
 204         struct nvme_subsystem *subsys;
 205         struct list_head subsys_entry;
 206
 207         struct opal_dev *opal_dev;
 208
 209         char name[12];
 210         u16 cntlid;
 211
 212         u32 ctrl_config;
 213         u16 mtfa;
 214         u32 queue_count;
 215
 216         u64 cap;
 217         u32 page_size;
 218         u32 max_hw_sectors;
 219         u32 max_segments;
 220         u16 crdt[3];
 221         u16 oncs;
 222         u16 oacs;
 223         u16 nssa;
 224         u16 nr_streams;
 225         u16 sqsize;
 226         u32 max_namespaces;
 227         atomic_t abort_limit;
 228         u8 vwc;
 229         u32 vs;
 230         u32 sgls;
 231         u16 kas;
 232         u8 npss;
 233         u8 apsta;
 234         u32 oaes;
 235         u32 aen_result;
 236         u32 ctratt;
 237         unsigned int shutdown_timeout;
 238         unsigned int kato;
 239         bool subsystem;
 240         unsigned long quirks;
 241         struct nvme_id_power_state psd[32];
 242         struct nvme_effects_log *effects;
 243         struct work_struct scan_work;
 244         struct work_struct async_event_work;
 245         struct delayed_work ka_work;
 246         struct nvme_command ka_cmd;
 247         struct work_struct fw_act_work;
 248         unsigned long events;
 249
 250 #ifdef CONFIG_NVME_MULTIPATH
 251         /* asymmetric namespace access: */
 252         u8 anacap;
 253         u8 anatt;
 254         u32 anagrpmax;
 255         u32 nanagrpid;
 256         struct mutex ana_lock;
 257         struct nvme_ana_rsp_hdr *ana_log_buf;
 258         size_t ana_log_size;
 259         struct timer_list anatt_timer;
 260         struct work_struct ana_work;
 261 #endif
 262
 263         /* Power saving configuration */
 264         u64 ps_max_latency_us;
 265         bool apst_enabled;
 266
 267         /* PCIe only: */
 268         u32 hmpre;
 269         u32 hmmin;
 270         u32 hmminds;
 271         u16 hmmaxd;
 272
 273         /* Fabrics only */
 274         u32 ioccsz;
 275         u32 iorcsz;
 276         u16 icdoff;
 277         u16 maxcmd;
 278         int nr_reconnects;
 279         struct nvmf_ctrl_options *opts;
 280
 281         struct page *discard_page;
 282         unsigned long discard_page_busy;
 283
 284         struct nvme_fault_inject fault_inject;
 285 };
 286
 287 enum nvme_iopolicy {
 288         NVME_IOPOLICY_NUMA,
 289         NVME_IOPOLICY_RR,
 290 };
 291
 292 struct nvme_subsystem {
 293         int                     instance;
 294         struct device           dev;
 295         /*
 296          * Because we unregister the device on the last put we need
 297          * a separate refcount.
 298          */
 299         struct kref             ref;
 300         struct list_head        entry;
 301         struct mutex            lock;
 302         struct list_head        ctrls;
 303         struct list_head        nsheads;
 304         char                    subnqn[NVMF_NQN_SIZE];
 305         char                    serial[20];
 306         char                    model[40];
 307         char                    firmware_rev[8];
 308         u8                      cmic;
 309         u16                     vendor_id;
 310         u16                     awupf;  /* 0's based awupf value. */
 311         struct ida              ns_ida;
 312 #ifdef CONFIG_NVME_MULTIPATH
 313         enum nvme_iopolicy      iopolicy;
 314 #endif
 315 };
 316
 317 /*
 318  * Container structure for uniqueue namespace identifiers.
 319  */
 320 struct nvme_ns_ids {
 321         u8      eui64[8];
 322         u8      nguid[16];
 323         uuid_t  uuid;
 324 };
 325
 326 /*
 327  * Anchor structure for namespaces.  There is one for each namespace in a
 328  * NVMe subsystem that any of our controllers can see, and the namespace
 329  * structure for each controller is chained of it.  For private namespaces
 330  * there is a 1:1 relation to our namespace structures, that is ->list
 331  * only ever has a single entry for private namespaces.
 332  */
 333 struct nvme_ns_head {
 334         struct list_head        list;
 335         struct srcu_struct      srcu;
 336         struct nvme_subsystem   *subsys;
 337         unsigned                ns_id;
 338         struct nvme_ns_ids      ids;
 339         struct list_head        entry;
 340         struct kref             ref;
 341         int                     instance;
 342 #ifdef CONFIG_NVME_MULTIPATH
 343         struct gendisk          *disk;
 344         struct bio_list         requeue_list;
 345         spinlock_t              requeue_lock;
 346         struct work_struct      requeue_work;
 347         struct mutex            lock;
 348         struct nvme_ns __rcu    *current_path[];
 349 #endif
 350 };
 351
 352 struct nvme_ns {
 353         struct list_head list;
 354
 355         struct nvme_ctrl *ctrl;
 356         struct request_queue *queue;
 357         struct gendisk *disk;
 358 #ifdef CONFIG_NVME_MULTIPATH
 359         enum nvme_ana_state ana_state;
 360         u32 ana_grpid;
 361 #endif
 362         struct list_head siblings;
 363         struct nvm_dev *ndev;
 364         struct kref kref;
 365         struct nvme_ns_head *head;
 366
 367         int lba_shift;
 368         u16 ms;
 369         u16 sgs;
 370         u32 sws;
 371         bool ext;
 372         u8 pi_type;
 373         unsigned long flags;
 374 #define NVME_NS_REMOVING        0
 375 #define NVME_NS_DEAD            1
 376 #define NVME_NS_ANA_PENDING     2
 377         u16 noiob;
 378
 379         struct nvme_fault_inject fault_inject;
 380
 381 };
 382
 383 struct nvme_ctrl_ops {
 384         const char *name;
 385         struct module *module;
 386         unsigned int flags;
 387 #define NVME_F_FABRICS                  (1 << 0)
 388 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 389 #define NVME_F_PCI_P2PDMA               (1 << 2)
 390         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 391         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 392         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 393         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 394         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 395         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 396         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 397 };
 398
 399 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 400 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 401                             const char *dev_name);
 402 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 403 void nvme_should_fail(struct request *req);
 404 #else
 405 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 406                                           const char *dev_name)
 407 {
 408 }
 409 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 410 {
 411 }
 412 static inline void nvme_should_fail(struct request *req) {}
 413 #endif
 414
 415 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 416 {
 417         if (!ctrl->subsystem)
 418                 return -ENOTTY;
 419         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 420 }
 421
 422 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 423 {
 424         return (sector >> (ns->lba_shift - 9));
 425 }
 426
 427 static inline void nvme_end_request(struct request *req, __le16 status,
 428                 union nvme_result result)
 429 {
 430         struct nvme_request *rq = nvme_req(req);
 431
 432         rq->status = le16_to_cpu(status) >> 1;
 433         rq->result = result;
 434         /* inject error when permitted by fault injection framework */
 435         nvme_should_fail(req);
 436         blk_mq_complete_request(req);
 437 }
 438
 439 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 440 {
 441         get_device(ctrl->device);
 442 }
 443
 444 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 445 {
 446         put_device(ctrl->device);
 447 }
 448
 449 void nvme_complete_rq(struct request *req);
 450 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 451 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 452                 enum nvme_ctrl_state new_state);
 453 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 454 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
 455 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 456 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 457 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 458                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 459 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 460 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 461 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 462 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 463 int nvme_init_identify(struct nvme_ctrl *ctrl);
 464
 465 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 466
 467 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 468                 bool send);
 469
 470 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 471                 volatile union nvme_result *res);
 472
 473 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 474 void nvme_start_queues(struct nvme_ctrl *ctrl);
 475 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 476 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 477 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 478 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 479 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 480 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 481
 482 #define NVME_QID_ANY -1
 483 struct request *nvme_alloc_request(struct request_queue *q,
 484                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 485 void nvme_cleanup_cmd(struct request *req);
 486 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 487                 struct nvme_command *cmd);
 488 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 489                 void *buf, unsigned bufflen);
 490 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 491                 union nvme_result *result, void *buffer, unsigned bufflen,
 492                 unsigned timeout, int qid, int at_head,
 493                 blk_mq_req_flags_t flags, bool poll);
 494 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 495                       unsigned int dword11, void *buffer, size_t buflen,
 496                       u32 *result);
 497 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 498                       unsigned int dword11, void *buffer, size_t buflen,
 499                       u32 *result);
 500 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 501 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 502 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 503 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 504 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 505 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 506
 507 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
 508                 void *log, size_t size, u64 offset);
 509
 510 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 511 extern const struct block_device_operations nvme_ns_head_ops;
 512
 513 #ifdef CONFIG_NVME_MULTIPATH
 514 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 515 {
 516         return ctrl->ana_log_buf != NULL;
 517 }
 518
 519 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 520 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 521 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 522 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 523                         struct nvme_ctrl *ctrl, int *flags);
 524 void nvme_failover_req(struct request *req);
 525 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 526 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 527 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 528 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 529 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 530 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 531 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 532 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 533 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 534 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 535
 536 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 537 {
 538         struct nvme_ns_head *head = ns->head;
 539
 540         if (head->disk && list_empty(&head->list))
 541                 kblockd_schedule_work(&head->requeue_work);
 542 }
 543
 544 static inline void nvme_trace_bio_complete(struct request *req,
 545         blk_status_t status)
 546 {
 547         struct nvme_ns *ns = req->q->queuedata;
 548
 549         if (req->cmd_flags & REQ_NVME_MPATH)
 550                 trace_block_bio_complete(ns->head->disk->queue,
 551                                          req->bio, status);
 552 }
 553
 554 extern struct device_attribute dev_attr_ana_grpid;
 555 extern struct device_attribute dev_attr_ana_state;
 556 extern struct device_attribute subsys_attr_iopolicy;
 557
 558 #else
 559 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 560 {
 561         return false;
 562 }
 563 /*
 564  * Without the multipath code enabled, multiple controller per subsystems are
 565  * visible as devices and thus we cannot use the subsystem instance.
 566  */
 567 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 568                                       struct nvme_ctrl *ctrl, int *flags)
 569 {
 570         sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 571 }
 572
 573 static inline void nvme_failover_req(struct request *req)
 574 {
 575 }
 576 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 577 {
 578 }
 579 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 580                 struct nvme_ns_head *head)
 581 {
 582         return 0;
 583 }
 584 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 585                 struct nvme_id_ns *id)
 586 {
 587 }
 588 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 589 {
 590 }
 591 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 592 {
 593         return false;
 594 }
 595 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 596 {
 597 }
 598 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 599 {
 600 }
 601 static inline void nvme_trace_bio_complete(struct request *req,
 602         blk_status_t status)
 603 {
 604 }
 605 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
 606                 struct nvme_id_ctrl *id)
 607 {
 608         if (ctrl->subsys->cmic & (1 << 3))
 609                 dev_warn(ctrl->device,
 610 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 611         return 0;
 612 }
 613 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 614 {
 615 }
 616 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 617 {
 618 }
 619 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 620 {
 621 }
 622 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 623 {
 624 }
 625 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 626 {
 627 }
 628 #endif /* CONFIG_NVME_MULTIPATH */
 629
 630 #ifdef CONFIG_NVM
 631 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 632 void nvme_nvm_unregister(struct nvme_ns *ns);
 633 extern const struct attribute_group nvme_nvm_attr_group;
 634 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 635 #else
 636 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 637                                     int node)
 638 {
 639         return 0;
 640 }
 641
 642 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 643 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 644                                                         unsigned long arg)
 645 {
 646         return -ENOTTY;
 647 }
 648 #endif /* CONFIG_NVM */
 649
 650 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 651 {
 652         return dev_to_disk(dev)->private_data;
 653 }
 654
 655 #endif /* _NVME_H */