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