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 #ifdef CONFIG_ARCH_NO_SG_CHAIN
  32 #define  NVME_INLINE_SG_CNT  0
  33 #else
  34 #define  NVME_INLINE_SG_CNT  2
  35 #endif
  36
  37 extern struct workqueue_struct *nvme_wq;
  38 extern struct workqueue_struct *nvme_reset_wq;
  39 extern struct workqueue_struct *nvme_delete_wq;
  40
  41 enum {
  42         NVME_NS_LBA             = 0,
  43         NVME_NS_LIGHTNVM        = 1,
  44 };
  45
  46 /*
  47  * List of workarounds for devices that required behavior not specified in
  48  * the standard.
  49  */
  50 enum nvme_quirks {
  51         /*
  52          * Prefers I/O aligned to a stripe size specified in a vendor
  53          * specific Identify field.
  54          */
  55         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  56
  57         /*
  58          * The controller doesn't handle Identify value others than 0 or 1
  59          * correctly.
  60          */
  61         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  62
  63         /*
  64          * The controller deterministically returns O's on reads to
  65          * logical blocks that deallocate was called on.
  66          */
  67         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  68
  69         /*
  70          * The controller needs a delay before starts checking the device
  71          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  72          */
  73         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  74
  75         /*
  76          * APST should not be used.
  77          */
  78         NVME_QUIRK_NO_APST                      = (1 << 4),
  79
  80         /*
  81          * The deepest sleep state should not be used.
  82          */
  83         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  84
  85         /*
  86          * Supports the LighNVM command set if indicated in vs[1].
  87          */
  88         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  89
  90         /*
  91          * Set MEDIUM priority on SQ creation
  92          */
  93         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
  94
  95         /*
  96          * Ignore device provided subnqn.
  97          */
  98         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
  99
 100         /*
 101          * Broken Write Zeroes.
 102          */
 103         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
 104
 105         /*
 106          * Force simple suspend/resume path.
 107          */
 108         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 109
 110         /*
 111          * Use only one interrupt vector for all queues
 112          */
 113         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 114
 115         /*
 116          * Use non-standard 128 bytes SQEs.
 117          */
 118         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 119
 120         /*
 121          * Prevent tag overlap between queues
 122          */
 123         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 124
 125         /*
 126          * Don't change the value of the temperature threshold feature
 127          */
 128         NVME_QUIRK_NO_TEMP_THRESH_CHANGE        = (1 << 14),
 129 };
 130
 131 /*
 132  * Common request structure for NVMe passthrough.  All drivers must have
 133  * this structure as the first member of their request-private data.
 134  */
 135 struct nvme_request {
 136         struct nvme_command     *cmd;
 137         union nvme_result       result;
 138         u8                      retries;
 139         u8                      flags;
 140         u16                     status;
 141         struct nvme_ctrl        *ctrl;
 142 };
 143
 144 /*
 145  * Mark a bio as coming in through the mpath node.
 146  */
 147 #define REQ_NVME_MPATH          REQ_DRV
 148
 149 enum {
 150         NVME_REQ_CANCELLED              = (1 << 0),
 151         NVME_REQ_USERCMD                = (1 << 1),
 152 };
 153
 154 static inline struct nvme_request *nvme_req(struct request *req)
 155 {
 156         return blk_mq_rq_to_pdu(req);
 157 }
 158
 159 static inline u16 nvme_req_qid(struct request *req)
 160 {
 161         if (!req->rq_disk)
 162                 return 0;
 163         return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1;
 164 }
 165
 166 /* The below value is the specific amount of delay needed before checking
 167  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 168  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 169  * found empirically.
 170  */
 171 #define NVME_QUIRK_DELAY_AMOUNT         2300
 172
 173 enum nvme_ctrl_state {
 174         NVME_CTRL_NEW,
 175         NVME_CTRL_LIVE,
 176         NVME_CTRL_RESETTING,
 177         NVME_CTRL_CONNECTING,
 178         NVME_CTRL_DELETING,
 179         NVME_CTRL_DEAD,
 180 };
 181
 182 struct nvme_fault_inject {
 183 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 184         struct fault_attr attr;
 185         struct dentry *parent;
 186         bool dont_retry;        /* DNR, do not retry */
 187         u16 status;             /* status code */
 188 #endif
 189 };
 190
 191 struct nvme_ctrl {
 192         bool comp_seen;
 193         enum nvme_ctrl_state state;
 194         bool identified;
 195         spinlock_t lock;
 196         struct mutex scan_lock;
 197         const struct nvme_ctrl_ops *ops;
 198         struct request_queue *admin_q;
 199         struct request_queue *connect_q;
 200         struct request_queue *fabrics_q;
 201         struct device *dev;
 202         int instance;
 203         int numa_node;
 204         struct blk_mq_tag_set *tagset;
 205         struct blk_mq_tag_set *admin_tagset;
 206         struct list_head namespaces;
 207         struct rw_semaphore namespaces_rwsem;
 208         struct device ctrl_device;
 209         struct device *device;  /* char device */
 210         struct cdev cdev;
 211         struct work_struct reset_work;
 212         struct work_struct delete_work;
 213         wait_queue_head_t state_wq;
 214
 215         struct nvme_subsystem *subsys;
 216         struct list_head subsys_entry;
 217
 218         struct opal_dev *opal_dev;
 219
 220         char name[12];
 221         u16 cntlid;
 222
 223         u32 ctrl_config;
 224         u16 mtfa;
 225         u32 queue_count;
 226
 227         u64 cap;
 228         u32 page_size;
 229         u32 max_hw_sectors;
 230         u32 max_segments;
 231         u16 crdt[3];
 232         u16 oncs;
 233         u16 oacs;
 234         u16 nssa;
 235         u16 nr_streams;
 236         u16 sqsize;
 237         u32 max_namespaces;
 238         atomic_t abort_limit;
 239         u8 vwc;
 240         u32 vs;
 241         u32 sgls;
 242         u16 kas;
 243         u8 npss;
 244         u8 apsta;
 245         u16 wctemp;
 246         u16 cctemp;
 247         u32 oaes;
 248         u32 aen_result;
 249         u32 ctratt;
 250         unsigned int shutdown_timeout;
 251         unsigned int kato;
 252         bool subsystem;
 253         unsigned long quirks;
 254         struct nvme_id_power_state psd[32];
 255         struct nvme_effects_log *effects;
 256         struct work_struct scan_work;
 257         struct work_struct async_event_work;
 258         struct delayed_work ka_work;
 259         struct nvme_command ka_cmd;
 260         struct work_struct fw_act_work;
 261         unsigned long events;
 262
 263 #ifdef CONFIG_NVME_MULTIPATH
 264         /* asymmetric namespace access: */
 265         u8 anacap;
 266         u8 anatt;
 267         u32 anagrpmax;
 268         u32 nanagrpid;
 269         struct mutex ana_lock;
 270         struct nvme_ana_rsp_hdr *ana_log_buf;
 271         size_t ana_log_size;
 272         struct timer_list anatt_timer;
 273         struct work_struct ana_work;
 274 #endif
 275
 276         /* Power saving configuration */
 277         u64 ps_max_latency_us;
 278         bool apst_enabled;
 279
 280         /* PCIe only: */
 281         u32 hmpre;
 282         u32 hmmin;
 283         u32 hmminds;
 284         u16 hmmaxd;
 285
 286         /* Fabrics only */
 287         u32 ioccsz;
 288         u32 iorcsz;
 289         u16 icdoff;
 290         u16 maxcmd;
 291         int nr_reconnects;
 292         struct nvmf_ctrl_options *opts;
 293
 294         struct page *discard_page;
 295         unsigned long discard_page_busy;
 296
 297         struct nvme_fault_inject fault_inject;
 298 };
 299
 300 enum nvme_iopolicy {
 301         NVME_IOPOLICY_NUMA,
 302         NVME_IOPOLICY_RR,
 303 };
 304
 305 struct nvme_subsystem {
 306         int                     instance;
 307         struct device           dev;
 308         /*
 309          * Because we unregister the device on the last put we need
 310          * a separate refcount.
 311          */
 312         struct kref             ref;
 313         struct list_head        entry;
 314         struct mutex            lock;
 315         struct list_head        ctrls;
 316         struct list_head        nsheads;
 317         char                    subnqn[NVMF_NQN_SIZE];
 318         char                    serial[20];
 319         char                    model[40];
 320         char                    firmware_rev[8];
 321         u8                      cmic;
 322         u16                     vendor_id;
 323         u16                     awupf;  /* 0's based awupf value. */
 324         struct ida              ns_ida;
 325 #ifdef CONFIG_NVME_MULTIPATH
 326         enum nvme_iopolicy      iopolicy;
 327 #endif
 328 };
 329
 330 /*
 331  * Container structure for uniqueue namespace identifiers.
 332  */
 333 struct nvme_ns_ids {
 334         u8      eui64[8];
 335         u8      nguid[16];
 336         uuid_t  uuid;
 337 };
 338
 339 /*
 340  * Anchor structure for namespaces.  There is one for each namespace in a
 341  * NVMe subsystem that any of our controllers can see, and the namespace
 342  * structure for each controller is chained of it.  For private namespaces
 343  * there is a 1:1 relation to our namespace structures, that is ->list
 344  * only ever has a single entry for private namespaces.
 345  */
 346 struct nvme_ns_head {
 347         struct list_head        list;
 348         struct srcu_struct      srcu;
 349         struct nvme_subsystem   *subsys;
 350         unsigned                ns_id;
 351         struct nvme_ns_ids      ids;
 352         struct list_head        entry;
 353         struct kref             ref;
 354         int                     instance;
 355 #ifdef CONFIG_NVME_MULTIPATH
 356         struct gendisk          *disk;
 357         struct bio_list         requeue_list;
 358         spinlock_t              requeue_lock;
 359         struct work_struct      requeue_work;
 360         struct mutex            lock;
 361         struct nvme_ns __rcu    *current_path[];
 362 #endif
 363 };
 364
 365 struct nvme_ns {
 366         struct list_head list;
 367
 368         struct nvme_ctrl *ctrl;
 369         struct request_queue *queue;
 370         struct gendisk *disk;
 371 #ifdef CONFIG_NVME_MULTIPATH
 372         enum nvme_ana_state ana_state;
 373         u32 ana_grpid;
 374 #endif
 375         struct list_head siblings;
 376         struct nvm_dev *ndev;
 377         struct kref kref;
 378         struct nvme_ns_head *head;
 379
 380         int lba_shift;
 381         u16 ms;
 382         u16 sgs;
 383         u32 sws;
 384         bool ext;
 385         u8 pi_type;
 386         unsigned long flags;
 387 #define NVME_NS_REMOVING        0
 388 #define NVME_NS_DEAD            1
 389 #define NVME_NS_ANA_PENDING     2
 390         u16 noiob;
 391
 392         struct nvme_fault_inject fault_inject;
 393
 394 };
 395
 396 struct nvme_ctrl_ops {
 397         const char *name;
 398         struct module *module;
 399         unsigned int flags;
 400 #define NVME_F_FABRICS                  (1 << 0)
 401 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 402 #define NVME_F_PCI_P2PDMA               (1 << 2)
 403         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 404         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 405         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 406         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 407         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 408         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 409         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 410 };
 411
 412 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 413 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 414                             const char *dev_name);
 415 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 416 void nvme_should_fail(struct request *req);
 417 #else
 418 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 419                                           const char *dev_name)
 420 {
 421 }
 422 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 423 {
 424 }
 425 static inline void nvme_should_fail(struct request *req) {}
 426 #endif
 427
 428 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 429 {
 430         if (!ctrl->subsystem)
 431                 return -ENOTTY;
 432         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 433 }
 434
 435 /*
 436  * Convert a 512B sector number to a device logical block number.
 437  */
 438 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
 439 {
 440         return sector >> (ns->lba_shift - SECTOR_SHIFT);
 441 }
 442
 443 /*
 444  * Convert a device logical block number to a 512B sector number.
 445  */
 446 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
 447 {
 448         return lba << (ns->lba_shift - SECTOR_SHIFT);
 449 }
 450
 451 static inline void nvme_end_request(struct request *req, __le16 status,
 452                 union nvme_result result)
 453 {
 454         struct nvme_request *rq = nvme_req(req);
 455
 456         rq->status = le16_to_cpu(status) >> 1;
 457         rq->result = result;
 458         /* inject error when permitted by fault injection framework */
 459         nvme_should_fail(req);
 460         blk_mq_complete_request(req);
 461 }
 462
 463 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 464 {
 465         get_device(ctrl->device);
 466 }
 467
 468 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 469 {
 470         put_device(ctrl->device);
 471 }
 472
 473 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 474 {
 475         return !qid && command_id >= NVME_AQ_BLK_MQ_DEPTH;
 476 }
 477
 478 void nvme_complete_rq(struct request *req);
 479 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 480 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 481                 enum nvme_ctrl_state new_state);
 482 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 483 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
 484 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 485 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 486 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 487                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 488 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 489 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 490 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 491 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 492 int nvme_init_identify(struct nvme_ctrl *ctrl);
 493
 494 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 495
 496 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 497                 bool send);
 498
 499 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 500                 volatile union nvme_result *res);
 501
 502 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 503 void nvme_start_queues(struct nvme_ctrl *ctrl);
 504 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 505 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 506 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 507 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 508 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 509 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 510
 511 #define NVME_QID_ANY -1
 512 struct request *nvme_alloc_request(struct request_queue *q,
 513                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 514 void nvme_cleanup_cmd(struct request *req);
 515 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 516                 struct nvme_command *cmd);
 517 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 518                 void *buf, unsigned bufflen);
 519 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 520                 union nvme_result *result, void *buffer, unsigned bufflen,
 521                 unsigned timeout, int qid, int at_head,
 522                 blk_mq_req_flags_t flags, bool poll);
 523 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 524                       unsigned int dword11, void *buffer, size_t buflen,
 525                       u32 *result);
 526 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 527                       unsigned int dword11, void *buffer, size_t buflen,
 528                       u32 *result);
 529 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 530 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 531 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 532 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 533 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 534 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 535
 536 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
 537                 void *log, size_t size, u64 offset);
 538
 539 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 540 extern const struct block_device_operations nvme_ns_head_ops;
 541
 542 #ifdef CONFIG_NVME_MULTIPATH
 543 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 544 {
 545         return ctrl->ana_log_buf != NULL;
 546 }
 547
 548 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 549 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 550 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 551 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 552                         struct nvme_ctrl *ctrl, int *flags);
 553 void nvme_failover_req(struct request *req);
 554 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 555 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 556 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 557 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 558 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 559 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 560 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 561 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 562 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 563 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 564
 565 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 566 {
 567         struct nvme_ns_head *head = ns->head;
 568
 569         if (head->disk && list_empty(&head->list))
 570                 kblockd_schedule_work(&head->requeue_work);
 571 }
 572
 573 static inline void nvme_trace_bio_complete(struct request *req,
 574         blk_status_t status)
 575 {
 576         struct nvme_ns *ns = req->q->queuedata;
 577
 578         if (req->cmd_flags & REQ_NVME_MPATH)
 579                 trace_block_bio_complete(ns->head->disk->queue,
 580                                          req->bio, status);
 581 }
 582
 583 extern struct device_attribute dev_attr_ana_grpid;
 584 extern struct device_attribute dev_attr_ana_state;
 585 extern struct device_attribute subsys_attr_iopolicy;
 586
 587 #else
 588 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 589 {
 590         return false;
 591 }
 592 /*
 593  * Without the multipath code enabled, multiple controller per subsystems are
 594  * visible as devices and thus we cannot use the subsystem instance.
 595  */
 596 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 597                                       struct nvme_ctrl *ctrl, int *flags)
 598 {
 599         sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 600 }
 601
 602 static inline void nvme_failover_req(struct request *req)
 603 {
 604 }
 605 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 606 {
 607 }
 608 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 609                 struct nvme_ns_head *head)
 610 {
 611         return 0;
 612 }
 613 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 614                 struct nvme_id_ns *id)
 615 {
 616 }
 617 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 618 {
 619 }
 620 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 621 {
 622         return false;
 623 }
 624 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 625 {
 626 }
 627 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 628 {
 629 }
 630 static inline void nvme_trace_bio_complete(struct request *req,
 631         blk_status_t status)
 632 {
 633 }
 634 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
 635                 struct nvme_id_ctrl *id)
 636 {
 637         if (ctrl->subsys->cmic & (1 << 3))
 638                 dev_warn(ctrl->device,
 639 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 640         return 0;
 641 }
 642 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 643 {
 644 }
 645 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 646 {
 647 }
 648 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 649 {
 650 }
 651 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 652 {
 653 }
 654 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 655 {
 656 }
 657 #endif /* CONFIG_NVME_MULTIPATH */
 658
 659 #ifdef CONFIG_NVM
 660 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 661 void nvme_nvm_unregister(struct nvme_ns *ns);
 662 extern const struct attribute_group nvme_nvm_attr_group;
 663 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 664 #else
 665 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 666                                     int node)
 667 {
 668         return 0;
 669 }
 670
 671 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 672 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 673                                                         unsigned long arg)
 674 {
 675         return -ENOTTY;
 676 }
 677 #endif /* CONFIG_NVM */
 678
 679 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 680 {
 681         return dev_to_disk(dev)->private_data;
 682 }
 683
 684 #ifdef CONFIG_NVME_HWMON
 685 void nvme_hwmon_init(struct nvme_ctrl *ctrl);
 686 #else
 687 static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
 688 #endif
 689
 690 #endif /* _NVME_H */