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 #include <linux/t10-pi.h>
  20
  21 #include <trace/events/block.h>
  22
  23 extern unsigned int nvme_io_timeout;
  24 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  25
  26 extern unsigned int admin_timeout;
  27 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  28
  29 #define NVME_DEFAULT_KATO       5
  30 #define NVME_KATO_GRACE         10
  31
  32 #ifdef CONFIG_ARCH_NO_SG_CHAIN
  33 #define  NVME_INLINE_SG_CNT  0
  34 #define  NVME_INLINE_METADATA_SG_CNT  0
  35 #else
  36 #define  NVME_INLINE_SG_CNT  2
  37 #define  NVME_INLINE_METADATA_SG_CNT  1
  38 #endif
  39
  40 extern struct workqueue_struct *nvme_wq;
  41 extern struct workqueue_struct *nvme_reset_wq;
  42 extern struct workqueue_struct *nvme_delete_wq;
  43
  44 enum {
  45         NVME_NS_LBA             = 0,
  46         NVME_NS_LIGHTNVM        = 1,
  47 };
  48
  49 /*
  50  * List of workarounds for devices that required behavior not specified in
  51  * the standard.
  52  */
  53 enum nvme_quirks {
  54         /*
  55          * Prefers I/O aligned to a stripe size specified in a vendor
  56          * specific Identify field.
  57          */
  58         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  59
  60         /*
  61          * The controller doesn't handle Identify value others than 0 or 1
  62          * correctly.
  63          */
  64         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  65
  66         /*
  67          * The controller deterministically returns O's on reads to
  68          * logical blocks that deallocate was called on.
  69          */
  70         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  71
  72         /*
  73          * The controller needs a delay before starts checking the device
  74          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  75          */
  76         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  77
  78         /*
  79          * APST should not be used.
  80          */
  81         NVME_QUIRK_NO_APST                      = (1 << 4),
  82
  83         /*
  84          * The deepest sleep state should not be used.
  85          */
  86         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  87
  88         /*
  89          * Supports the LighNVM command set if indicated in vs[1].
  90          */
  91         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  92
  93         /*
  94          * Set MEDIUM priority on SQ creation
  95          */
  96         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
  97
  98         /*
  99          * Ignore device provided subnqn.
 100          */
 101         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
 102
 103         /*
 104          * Broken Write Zeroes.
 105          */
 106         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
 107
 108         /*
 109          * Force simple suspend/resume path.
 110          */
 111         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 112
 113         /*
 114          * Use only one interrupt vector for all queues
 115          */
 116         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 117
 118         /*
 119          * Use non-standard 128 bytes SQEs.
 120          */
 121         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 122
 123         /*
 124          * Prevent tag overlap between queues
 125          */
 126         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 127
 128         /*
 129          * Don't change the value of the temperature threshold feature
 130          */
 131         NVME_QUIRK_NO_TEMP_THRESH_CHANGE        = (1 << 14),
 132 };
 133
 134 /*
 135  * Common request structure for NVMe passthrough.  All drivers must have
 136  * this structure as the first member of their request-private data.
 137  */
 138 struct nvme_request {
 139         struct nvme_command     *cmd;
 140         union nvme_result       result;
 141         u8                      retries;
 142         u8                      flags;
 143         u16                     status;
 144         struct nvme_ctrl        *ctrl;
 145 };
 146
 147 /*
 148  * Mark a bio as coming in through the mpath node.
 149  */
 150 #define REQ_NVME_MPATH          REQ_DRV
 151
 152 enum {
 153         NVME_REQ_CANCELLED              = (1 << 0),
 154         NVME_REQ_USERCMD                = (1 << 1),
 155 };
 156
 157 static inline struct nvme_request *nvme_req(struct request *req)
 158 {
 159         return blk_mq_rq_to_pdu(req);
 160 }
 161
 162 static inline u16 nvme_req_qid(struct request *req)
 163 {
 164         if (!req->rq_disk)
 165                 return 0;
 166         return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1;
 167 }
 168
 169 /* The below value is the specific amount of delay needed before checking
 170  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 171  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 172  * found empirically.
 173  */
 174 #define NVME_QUIRK_DELAY_AMOUNT         2300
 175
 176 enum nvme_ctrl_state {
 177         NVME_CTRL_NEW,
 178         NVME_CTRL_LIVE,
 179         NVME_CTRL_RESETTING,
 180         NVME_CTRL_CONNECTING,
 181         NVME_CTRL_DELETING,
 182         NVME_CTRL_DEAD,
 183 };
 184
 185 struct nvme_fault_inject {
 186 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 187         struct fault_attr attr;
 188         struct dentry *parent;
 189         bool dont_retry;        /* DNR, do not retry */
 190         u16 status;             /* status code */
 191 #endif
 192 };
 193
 194 struct nvme_ctrl {
 195         bool comp_seen;
 196         enum nvme_ctrl_state state;
 197         bool identified;
 198         spinlock_t lock;
 199         struct mutex scan_lock;
 200         const struct nvme_ctrl_ops *ops;
 201         struct request_queue *admin_q;
 202         struct request_queue *connect_q;
 203         struct request_queue *fabrics_q;
 204         struct device *dev;
 205         int instance;
 206         int numa_node;
 207         struct blk_mq_tag_set *tagset;
 208         struct blk_mq_tag_set *admin_tagset;
 209         struct list_head namespaces;
 210         struct rw_semaphore namespaces_rwsem;
 211         struct device ctrl_device;
 212         struct device *device;  /* char device */
 213         struct cdev cdev;
 214         struct work_struct reset_work;
 215         struct work_struct delete_work;
 216         wait_queue_head_t state_wq;
 217
 218         struct nvme_subsystem *subsys;
 219         struct list_head subsys_entry;
 220
 221         struct opal_dev *opal_dev;
 222
 223         char name[12];
 224         u16 cntlid;
 225
 226         u32 ctrl_config;
 227         u16 mtfa;
 228         u32 queue_count;
 229
 230         u64 cap;
 231         u32 page_size;
 232         u32 max_hw_sectors;
 233         u32 max_segments;
 234         u32 max_integrity_segments;
 235         u16 crdt[3];
 236         u16 oncs;
 237         u16 oacs;
 238         u16 nssa;
 239         u16 nr_streams;
 240         u16 sqsize;
 241         u32 max_namespaces;
 242         atomic_t abort_limit;
 243         u8 vwc;
 244         u32 vs;
 245         u32 sgls;
 246         u16 kas;
 247         u8 npss;
 248         u8 apsta;
 249         u16 wctemp;
 250         u16 cctemp;
 251         u32 oaes;
 252         u32 aen_result;
 253         u32 ctratt;
 254         unsigned int shutdown_timeout;
 255         unsigned int kato;
 256         bool subsystem;
 257         unsigned long quirks;
 258         struct nvme_id_power_state psd[32];
 259         struct nvme_effects_log *effects;
 260         struct work_struct scan_work;
 261         struct work_struct async_event_work;
 262         struct delayed_work ka_work;
 263         struct nvme_command ka_cmd;
 264         struct work_struct fw_act_work;
 265         unsigned long events;
 266         bool created;
 267
 268 #ifdef CONFIG_NVME_MULTIPATH
 269         /* asymmetric namespace access: */
 270         u8 anacap;
 271         u8 anatt;
 272         u32 anagrpmax;
 273         u32 nanagrpid;
 274         struct mutex ana_lock;
 275         struct nvme_ana_rsp_hdr *ana_log_buf;
 276         size_t ana_log_size;
 277         struct timer_list anatt_timer;
 278         struct work_struct ana_work;
 279 #endif
 280
 281         /* Power saving configuration */
 282         u64 ps_max_latency_us;
 283         bool apst_enabled;
 284
 285         /* PCIe only: */
 286         u32 hmpre;
 287         u32 hmmin;
 288         u32 hmminds;
 289         u16 hmmaxd;
 290
 291         /* Fabrics only */
 292         u32 ioccsz;
 293         u32 iorcsz;
 294         u16 icdoff;
 295         u16 maxcmd;
 296         int nr_reconnects;
 297         struct nvmf_ctrl_options *opts;
 298
 299         struct page *discard_page;
 300         unsigned long discard_page_busy;
 301
 302         struct nvme_fault_inject fault_inject;
 303 };
 304
 305 enum nvme_iopolicy {
 306         NVME_IOPOLICY_NUMA,
 307         NVME_IOPOLICY_RR,
 308 };
 309
 310 struct nvme_subsystem {
 311         int                     instance;
 312         struct device           dev;
 313         /*
 314          * Because we unregister the device on the last put we need
 315          * a separate refcount.
 316          */
 317         struct kref             ref;
 318         struct list_head        entry;
 319         struct mutex            lock;
 320         struct list_head        ctrls;
 321         struct list_head        nsheads;
 322         char                    subnqn[NVMF_NQN_SIZE];
 323         char                    serial[20];
 324         char                    model[40];
 325         char                    firmware_rev[8];
 326         u8                      cmic;
 327         u16                     vendor_id;
 328         u16                     awupf;  /* 0's based awupf value. */
 329         struct ida              ns_ida;
 330 #ifdef CONFIG_NVME_MULTIPATH
 331         enum nvme_iopolicy      iopolicy;
 332 #endif
 333 };
 334
 335 /*
 336  * Container structure for uniqueue namespace identifiers.
 337  */
 338 struct nvme_ns_ids {
 339         u8      eui64[8];
 340         u8      nguid[16];
 341         uuid_t  uuid;
 342 };
 343
 344 /*
 345  * Anchor structure for namespaces.  There is one for each namespace in a
 346  * NVMe subsystem that any of our controllers can see, and the namespace
 347  * structure for each controller is chained of it.  For private namespaces
 348  * there is a 1:1 relation to our namespace structures, that is ->list
 349  * only ever has a single entry for private namespaces.
 350  */
 351 struct nvme_ns_head {
 352         struct list_head        list;
 353         struct srcu_struct      srcu;
 354         struct nvme_subsystem   *subsys;
 355         unsigned                ns_id;
 356         struct nvme_ns_ids      ids;
 357         struct list_head        entry;
 358         struct kref             ref;
 359         bool                    shared;
 360         int                     instance;
 361 #ifdef CONFIG_NVME_MULTIPATH
 362         struct gendisk          *disk;
 363         struct bio_list         requeue_list;
 364         spinlock_t              requeue_lock;
 365         struct work_struct      requeue_work;
 366         struct mutex            lock;
 367         struct nvme_ns __rcu    *current_path[];
 368 #endif
 369 };
 370
 371 enum nvme_ns_features {
 372         NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
 373         NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
 374 };
 375
 376 struct nvme_ns {
 377         struct list_head list;
 378
 379         struct nvme_ctrl *ctrl;
 380         struct request_queue *queue;
 381         struct gendisk *disk;
 382 #ifdef CONFIG_NVME_MULTIPATH
 383         enum nvme_ana_state ana_state;
 384         u32 ana_grpid;
 385 #endif
 386         struct list_head siblings;
 387         struct nvm_dev *ndev;
 388         struct kref kref;
 389         struct nvme_ns_head *head;
 390
 391         int lba_shift;
 392         u16 ms;
 393         u16 sgs;
 394         u32 sws;
 395         u8 pi_type;
 396         unsigned long features;
 397         unsigned long flags;
 398 #define NVME_NS_REMOVING        0
 399 #define NVME_NS_DEAD            1
 400 #define NVME_NS_ANA_PENDING     2
 401
 402         struct nvme_fault_inject fault_inject;
 403
 404 };
 405
 406 /* NVMe ns supports metadata actions by the controller (generate/strip) */
 407 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
 408 {
 409         return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
 410 }
 411
 412 struct nvme_ctrl_ops {
 413         const char *name;
 414         struct module *module;
 415         unsigned int flags;
 416 #define NVME_F_FABRICS                  (1 << 0)
 417 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 418 #define NVME_F_PCI_P2PDMA               (1 << 2)
 419         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 420         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 421         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 422         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 423         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 424         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 425         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 426 };
 427
 428 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 429 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 430                             const char *dev_name);
 431 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 432 void nvme_should_fail(struct request *req);
 433 #else
 434 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 435                                           const char *dev_name)
 436 {
 437 }
 438 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 439 {
 440 }
 441 static inline void nvme_should_fail(struct request *req) {}
 442 #endif
 443
 444 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 445 {
 446         if (!ctrl->subsystem)
 447                 return -ENOTTY;
 448         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 449 }
 450
 451 /*
 452  * Convert a 512B sector number to a device logical block number.
 453  */
 454 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
 455 {
 456         return sector >> (ns->lba_shift - SECTOR_SHIFT);
 457 }
 458
 459 /*
 460  * Convert a device logical block number to a 512B sector number.
 461  */
 462 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
 463 {
 464         return lba << (ns->lba_shift - SECTOR_SHIFT);
 465 }
 466
 467 /*
 468  * Convert byte length to nvme's 0-based num dwords
 469  */
 470 static inline u32 nvme_bytes_to_numd(size_t len)
 471 {
 472         return (len >> 2) - 1;
 473 }
 474
 475 static inline void nvme_end_request(struct request *req, __le16 status,
 476                 union nvme_result result)
 477 {
 478         struct nvme_request *rq = nvme_req(req);
 479
 480         rq->status = le16_to_cpu(status) >> 1;
 481         rq->result = result;
 482         /* inject error when permitted by fault injection framework */
 483         nvme_should_fail(req);
 484         blk_mq_complete_request(req);
 485 }
 486
 487 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 488 {
 489         get_device(ctrl->device);
 490 }
 491
 492 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 493 {
 494         put_device(ctrl->device);
 495 }
 496
 497 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 498 {
 499         return !qid && command_id >= NVME_AQ_BLK_MQ_DEPTH;
 500 }
 501
 502 void nvme_complete_rq(struct request *req);
 503 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 504 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 505                 enum nvme_ctrl_state new_state);
 506 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 507 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
 508 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 509 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 510 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 511                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 512 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 513 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 514 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 515 int nvme_init_identify(struct nvme_ctrl *ctrl);
 516
 517 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 518
 519 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 520                 bool send);
 521
 522 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 523                 volatile union nvme_result *res);
 524
 525 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 526 void nvme_start_queues(struct nvme_ctrl *ctrl);
 527 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 528 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 529 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 530 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 531 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 532 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 533
 534 #define NVME_QID_ANY -1
 535 struct request *nvme_alloc_request(struct request_queue *q,
 536                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 537 void nvme_cleanup_cmd(struct request *req);
 538 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 539                 struct nvme_command *cmd);
 540 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 541                 void *buf, unsigned bufflen);
 542 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 543                 union nvme_result *result, void *buffer, unsigned bufflen,
 544                 unsigned timeout, int qid, int at_head,
 545                 blk_mq_req_flags_t flags, bool poll);
 546 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 547                       unsigned int dword11, void *buffer, size_t buflen,
 548                       u32 *result);
 549 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 550                       unsigned int dword11, void *buffer, size_t buflen,
 551                       u32 *result);
 552 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 553 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 554 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 555 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 556 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 557 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 558
 559 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
 560                 void *log, size_t size, u64 offset);
 561
 562 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 563 extern const struct block_device_operations nvme_ns_head_ops;
 564
 565 #ifdef CONFIG_NVME_MULTIPATH
 566 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 567 {
 568         return ctrl->ana_log_buf != NULL;
 569 }
 570
 571 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 572 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 573 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 574 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 575                         struct nvme_ctrl *ctrl, int *flags);
 576 bool nvme_failover_req(struct request *req);
 577 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 578 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 579 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 580 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 581 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 582 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 583 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 584 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 585 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 586 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 587
 588 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 589 {
 590         struct nvme_ns_head *head = ns->head;
 591
 592         if (head->disk && list_empty(&head->list))
 593                 kblockd_schedule_work(&head->requeue_work);
 594 }
 595
 596 static inline void nvme_trace_bio_complete(struct request *req,
 597         blk_status_t status)
 598 {
 599         struct nvme_ns *ns = req->q->queuedata;
 600
 601         if (req->cmd_flags & REQ_NVME_MPATH)
 602                 trace_block_bio_complete(ns->head->disk->queue,
 603                                          req->bio, status);
 604 }
 605
 606 extern struct device_attribute dev_attr_ana_grpid;
 607 extern struct device_attribute dev_attr_ana_state;
 608 extern struct device_attribute subsys_attr_iopolicy;
 609
 610 #else
 611 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 612 {
 613         return false;
 614 }
 615 /*
 616  * Without the multipath code enabled, multiple controller per subsystems are
 617  * visible as devices and thus we cannot use the subsystem instance.
 618  */
 619 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 620                                       struct nvme_ctrl *ctrl, int *flags)
 621 {
 622         sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 623 }
 624
 625 static inline bool nvme_failover_req(struct request *req)
 626 {
 627         return false;
 628 }
 629 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 630 {
 631 }
 632 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 633                 struct nvme_ns_head *head)
 634 {
 635         return 0;
 636 }
 637 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 638                 struct nvme_id_ns *id)
 639 {
 640 }
 641 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 642 {
 643 }
 644 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 645 {
 646         return false;
 647 }
 648 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 649 {
 650 }
 651 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 652 {
 653 }
 654 static inline void nvme_trace_bio_complete(struct request *req,
 655         blk_status_t status)
 656 {
 657 }
 658 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
 659                 struct nvme_id_ctrl *id)
 660 {
 661         if (ctrl->subsys->cmic & (1 << 3))
 662                 dev_warn(ctrl->device,
 663 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 664         return 0;
 665 }
 666 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 667 {
 668 }
 669 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 670 {
 671 }
 672 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 673 {
 674 }
 675 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 676 {
 677 }
 678 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 679 {
 680 }
 681 #endif /* CONFIG_NVME_MULTIPATH */
 682
 683 #ifdef CONFIG_NVM
 684 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 685 void nvme_nvm_unregister(struct nvme_ns *ns);
 686 extern const struct attribute_group nvme_nvm_attr_group;
 687 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 688 #else
 689 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 690                                     int node)
 691 {
 692         return 0;
 693 }
 694
 695 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 696 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 697                                                         unsigned long arg)
 698 {
 699         return -ENOTTY;
 700 }
 701 #endif /* CONFIG_NVM */
 702
 703 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 704 {
 705         return dev_to_disk(dev)->private_data;
 706 }
 707
 708 #ifdef CONFIG_NVME_HWMON
 709 void nvme_hwmon_init(struct nvme_ctrl *ctrl);
 710 #else
 711 static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
 712 #endif
 713
 714 #endif /* _NVME_H */