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/sed-opal.h>
  15 #include <linux/fault-inject.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/wait.h>
  18 #include <linux/t10-pi.h>
  19 #include <linux/ratelimit_types.h>
  20
  21 #include <trace/events/block.h>
  22
  23 extern const struct pr_ops nvme_pr_ops;
  24
  25 extern unsigned int nvme_io_timeout;
  26 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  27
  28 extern unsigned int admin_timeout;
  29 #define NVME_ADMIN_TIMEOUT      (admin_timeout * HZ)
  30
  31 #define NVME_DEFAULT_KATO       5
  32
  33 #ifdef CONFIG_ARCH_NO_SG_CHAIN
  34 #define  NVME_INLINE_SG_CNT  0
  35 #define  NVME_INLINE_METADATA_SG_CNT  0
  36 #else
  37 #define  NVME_INLINE_SG_CNT  2
  38 #define  NVME_INLINE_METADATA_SG_CNT  1
  39 #endif
  40
  41 /*
  42  * Default to a 4K page size, with the intention to update this
  43  * path in the future to accommodate architectures with differing
  44  * kernel and IO page sizes.
  45  */
  46 #define NVME_CTRL_PAGE_SHIFT    12
  47 #define NVME_CTRL_PAGE_SIZE     (1 << NVME_CTRL_PAGE_SHIFT)
  48
  49 extern struct workqueue_struct *nvme_wq;
  50 extern struct workqueue_struct *nvme_reset_wq;
  51 extern struct workqueue_struct *nvme_delete_wq;
  52 extern struct mutex nvme_subsystems_lock;
  53
  54 /*
  55  * List of workarounds for devices that required behavior not specified in
  56  * the standard.
  57  */
  58 enum nvme_quirks {
  59         /*
  60          * Prefers I/O aligned to a stripe size specified in a vendor
  61          * specific Identify field.
  62          */
  63         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  64
  65         /*
  66          * The controller doesn't handle Identify value others than 0 or 1
  67          * correctly.
  68          */
  69         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  70
  71         /*
  72          * The controller deterministically returns O's on reads to
  73          * logical blocks that deallocate was called on.
  74          */
  75         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  76
  77         /*
  78          * The controller needs a delay before starts checking the device
  79          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  80          */
  81         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  82
  83         /*
  84          * APST should not be used.
  85          */
  86         NVME_QUIRK_NO_APST                      = (1 << 4),
  87
  88         /*
  89          * The deepest sleep state should not be used.
  90          */
  91         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  92
  93         /*
  94          *  Problems seen with concurrent commands
  95          */
  96         NVME_QUIRK_QDEPTH_ONE                   = (1 << 6),
  97
  98         /*
  99          * Set MEDIUM priority on SQ creation
 100          */
 101         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
 102
 103         /*
 104          * Ignore device provided subnqn.
 105          */
 106         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
 107
 108         /*
 109          * Broken Write Zeroes.
 110          */
 111         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
 112
 113         /*
 114          * Force simple suspend/resume path.
 115          */
 116         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 117
 118         /*
 119          * Use only one interrupt vector for all queues
 120          */
 121         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 122
 123         /*
 124          * Use non-standard 128 bytes SQEs.
 125          */
 126         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 127
 128         /*
 129          * Prevent tag overlap between queues
 130          */
 131         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 132
 133         /*
 134          * Don't change the value of the temperature threshold feature
 135          */
 136         NVME_QUIRK_NO_TEMP_THRESH_CHANGE        = (1 << 14),
 137
 138         /*
 139          * The controller doesn't handle the Identify Namespace
 140          * Identification Descriptor list subcommand despite claiming
 141          * NVMe 1.3 compliance.
 142          */
 143         NVME_QUIRK_NO_NS_DESC_LIST              = (1 << 15),
 144
 145         /*
 146          * The controller does not properly handle DMA addresses over
 147          * 48 bits.
 148          */
 149         NVME_QUIRK_DMA_ADDRESS_BITS_48          = (1 << 16),
 150
 151         /*
 152          * The controller requires the command_id value be limited, so skip
 153          * encoding the generation sequence number.
 154          */
 155         NVME_QUIRK_SKIP_CID_GEN                 = (1 << 17),
 156
 157         /*
 158          * Reports garbage in the namespace identifiers (eui64, nguid, uuid).
 159          */
 160         NVME_QUIRK_BOGUS_NID                    = (1 << 18),
 161
 162         /*
 163          * No temperature thresholds for channels other than 0 (Composite).
 164          */
 165         NVME_QUIRK_NO_SECONDARY_TEMP_THRESH     = (1 << 19),
 166
 167         /*
 168          * Disables simple suspend/resume path.
 169          */
 170         NVME_QUIRK_FORCE_NO_SIMPLE_SUSPEND      = (1 << 20),
 171
 172         /*
 173          * MSI (but not MSI-X) interrupts are broken and never fire.
 174          */
 175         NVME_QUIRK_BROKEN_MSI                   = (1 << 21),
 176 };
 177
 178 /*
 179  * Common request structure for NVMe passthrough.  All drivers must have
 180  * this structure as the first member of their request-private data.
 181  */
 182 struct nvme_request {
 183         struct nvme_command     *cmd;
 184         union nvme_result       result;
 185         u8                      genctr;
 186         u8                      retries;
 187         u8                      flags;
 188         u16                     status;
 189 #ifdef CONFIG_NVME_MULTIPATH
 190         unsigned long           start_time;
 191 #endif
 192         struct nvme_ctrl        *ctrl;
 193 };
 194
 195 /*
 196  * Mark a bio as coming in through the mpath node.
 197  */
 198 #define REQ_NVME_MPATH          REQ_DRV
 199
 200 enum {
 201         NVME_REQ_CANCELLED              = (1 << 0),
 202         NVME_REQ_USERCMD                = (1 << 1),
 203         NVME_MPATH_IO_STATS             = (1 << 2),
 204         NVME_MPATH_CNT_ACTIVE           = (1 << 3),
 205 };
 206
 207 static inline struct nvme_request *nvme_req(struct request *req)
 208 {
 209         return blk_mq_rq_to_pdu(req);
 210 }
 211
 212 static inline u16 nvme_req_qid(struct request *req)
 213 {
 214         if (!req->q->queuedata)
 215                 return 0;
 216
 217         return req->mq_hctx->queue_num + 1;
 218 }
 219
 220 /* The below value is the specific amount of delay needed before checking
 221  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 222  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 223  * found empirically.
 224  */
 225 #define NVME_QUIRK_DELAY_AMOUNT         2300
 226
 227 /*
 228  * enum nvme_ctrl_state: Controller state
 229  *
 230  * @NVME_CTRL_NEW:              New controller just allocated, initial state
 231  * @NVME_CTRL_LIVE:             Controller is connected and I/O capable
 232  * @NVME_CTRL_RESETTING:        Controller is resetting (or scheduled reset)
 233  * @NVME_CTRL_CONNECTING:       Controller is disconnected, now connecting the
 234  *                              transport
 235  * @NVME_CTRL_DELETING:         Controller is deleting (or scheduled deletion)
 236  * @NVME_CTRL_DELETING_NOIO:    Controller is deleting and I/O is not
 237  *                              disabled/failed immediately. This state comes
 238  *                              after all async event processing took place and
 239  *                              before ns removal and the controller deletion
 240  *                              progress
 241  * @NVME_CTRL_DEAD:             Controller is non-present/unresponsive during
 242  *                              shutdown or removal. In this case we forcibly
 243  *                              kill all inflight I/O as they have no chance to
 244  *                              complete
 245  */
 246 enum nvme_ctrl_state {
 247         NVME_CTRL_NEW,
 248         NVME_CTRL_LIVE,
 249         NVME_CTRL_RESETTING,
 250         NVME_CTRL_CONNECTING,
 251         NVME_CTRL_DELETING,
 252         NVME_CTRL_DELETING_NOIO,
 253         NVME_CTRL_DEAD,
 254 };
 255
 256 struct nvme_fault_inject {
 257 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 258         struct fault_attr attr;
 259         struct dentry *parent;
 260         bool dont_retry;        /* DNR, do not retry */
 261         u16 status;             /* status code */
 262 #endif
 263 };
 264
 265 enum nvme_ctrl_flags {
 266         NVME_CTRL_FAILFAST_EXPIRED      = 0,
 267         NVME_CTRL_ADMIN_Q_STOPPED       = 1,
 268         NVME_CTRL_STARTED_ONCE          = 2,
 269         NVME_CTRL_STOPPED               = 3,
 270         NVME_CTRL_SKIP_ID_CNS_CS        = 4,
 271         NVME_CTRL_DIRTY_CAPABILITY      = 5,
 272         NVME_CTRL_FROZEN                = 6,
 273 };
 274
 275 struct nvme_ctrl {
 276         bool comp_seen;
 277         bool identified;
 278         bool passthru_err_log_enabled;
 279         enum nvme_ctrl_state state;
 280         spinlock_t lock;
 281         struct mutex scan_lock;
 282         const struct nvme_ctrl_ops *ops;
 283         struct request_queue *admin_q;
 284         struct request_queue *connect_q;
 285         struct request_queue *fabrics_q;
 286         struct device *dev;
 287         int instance;
 288         int numa_node;
 289         struct blk_mq_tag_set *tagset;
 290         struct blk_mq_tag_set *admin_tagset;
 291         struct list_head namespaces;
 292         struct mutex namespaces_lock;
 293         struct srcu_struct srcu;
 294         struct device ctrl_device;
 295         struct device *device;  /* char device */
 296 #ifdef CONFIG_NVME_HWMON
 297         struct device *hwmon_device;
 298 #endif
 299         struct cdev cdev;
 300         struct work_struct reset_work;
 301         struct work_struct delete_work;
 302         wait_queue_head_t state_wq;
 303
 304         struct nvme_subsystem *subsys;
 305         struct list_head subsys_entry;
 306
 307         struct opal_dev *opal_dev;
 308
 309         u16 cntlid;
 310
 311         u16 mtfa;
 312         u32 ctrl_config;
 313         u32 queue_count;
 314
 315         u64 cap;
 316         u32 max_hw_sectors;
 317         u32 max_segments;
 318         u32 max_integrity_segments;
 319         u32 max_zeroes_sectors;
 320 #ifdef CONFIG_BLK_DEV_ZONED
 321         u32 max_zone_append;
 322 #endif
 323         u16 crdt[3];
 324         u16 oncs;
 325         u8 dmrl;
 326         u32 dmrsl;
 327         u16 oacs;
 328         u16 sqsize;
 329         u32 max_namespaces;
 330         atomic_t abort_limit;
 331         u8 vwc;
 332         u32 vs;
 333         u32 sgls;
 334         u16 kas;
 335         u8 npss;
 336         u8 apsta;
 337         u16 wctemp;
 338         u16 cctemp;
 339         u32 oaes;
 340         u32 aen_result;
 341         u32 ctratt;
 342         unsigned int shutdown_timeout;
 343         unsigned int kato;
 344         bool subsystem;
 345         unsigned long quirks;
 346         struct nvme_id_power_state psd[32];
 347         struct nvme_effects_log *effects;
 348         struct xarray cels;
 349         struct work_struct scan_work;
 350         struct work_struct async_event_work;
 351         struct delayed_work ka_work;
 352         struct delayed_work failfast_work;
 353         struct nvme_command ka_cmd;
 354         unsigned long ka_last_check_time;
 355         struct work_struct fw_act_work;
 356         unsigned long events;
 357
 358 #ifdef CONFIG_NVME_MULTIPATH
 359         /* asymmetric namespace access: */
 360         u8 anacap;
 361         u8 anatt;
 362         u32 anagrpmax;
 363         u32 nanagrpid;
 364         struct mutex ana_lock;
 365         struct nvme_ana_rsp_hdr *ana_log_buf;
 366         size_t ana_log_size;
 367         struct timer_list anatt_timer;
 368         struct work_struct ana_work;
 369         atomic_t nr_active;
 370 #endif
 371
 372 #ifdef CONFIG_NVME_HOST_AUTH
 373         struct work_struct dhchap_auth_work;
 374         struct mutex dhchap_auth_mutex;
 375         struct nvme_dhchap_queue_context *dhchap_ctxs;
 376         struct nvme_dhchap_key *host_key;
 377         struct nvme_dhchap_key *ctrl_key;
 378         u16 transaction;
 379 #endif
 380         key_serial_t tls_pskid;
 381
 382         /* Power saving configuration */
 383         u64 ps_max_latency_us;
 384         bool apst_enabled;
 385
 386         /* PCIe only: */
 387         u16 hmmaxd;
 388         u32 hmpre;
 389         u32 hmmin;
 390         u32 hmminds;
 391
 392         /* Fabrics only */
 393         u32 ioccsz;
 394         u32 iorcsz;
 395         u16 icdoff;
 396         u16 maxcmd;
 397         int nr_reconnects;
 398         unsigned long flags;
 399         struct nvmf_ctrl_options *opts;
 400
 401         struct page *discard_page;
 402         unsigned long discard_page_busy;
 403
 404         struct nvme_fault_inject fault_inject;
 405
 406         enum nvme_ctrl_type cntrltype;
 407         enum nvme_dctype dctype;
 408 };
 409
 410 static inline enum nvme_ctrl_state nvme_ctrl_state(struct nvme_ctrl *ctrl)
 411 {
 412         return READ_ONCE(ctrl->state);
 413 }
 414
 415 enum nvme_iopolicy {
 416         NVME_IOPOLICY_NUMA,
 417         NVME_IOPOLICY_RR,
 418         NVME_IOPOLICY_QD,
 419 };
 420
 421 struct nvme_subsystem {
 422         int                     instance;
 423         struct device           dev;
 424         /*
 425          * Because we unregister the device on the last put we need
 426          * a separate refcount.
 427          */
 428         struct kref             ref;
 429         struct list_head        entry;
 430         struct mutex            lock;
 431         struct list_head        ctrls;
 432         struct list_head        nsheads;
 433         char                    subnqn[NVMF_NQN_SIZE];
 434         char                    serial[20];
 435         char                    model[40];
 436         char                    firmware_rev[8];
 437         u8                      cmic;
 438         enum nvme_subsys_type   subtype;
 439         u16                     vendor_id;
 440         u16                     awupf;  /* 0's based awupf value. */
 441         struct ida              ns_ida;
 442 #ifdef CONFIG_NVME_MULTIPATH
 443         enum nvme_iopolicy      iopolicy;
 444 #endif
 445 };
 446
 447 /*
 448  * Container structure for uniqueue namespace identifiers.
 449  */
 450 struct nvme_ns_ids {
 451         u8      eui64[8];
 452         u8      nguid[16];
 453         uuid_t  uuid;
 454         u8      csi;
 455 };
 456
 457 /*
 458  * Anchor structure for namespaces.  There is one for each namespace in a
 459  * NVMe subsystem that any of our controllers can see, and the namespace
 460  * structure for each controller is chained of it.  For private namespaces
 461  * there is a 1:1 relation to our namespace structures, that is ->list
 462  * only ever has a single entry for private namespaces.
 463  */
 464 struct nvme_ns_head {
 465         struct list_head        list;
 466         struct srcu_struct      srcu;
 467         struct nvme_subsystem   *subsys;
 468         struct nvme_ns_ids      ids;
 469         u8                      lba_shift;
 470         u16                     ms;
 471         u16                     pi_size;
 472         u8                      pi_type;
 473         u8                      guard_type;
 474         struct list_head        entry;
 475         struct kref             ref;
 476         bool                    shared;
 477         bool                    passthru_err_log_enabled;
 478         struct nvme_effects_log *effects;
 479         u64                     nuse;
 480         unsigned                ns_id;
 481         int                     instance;
 482 #ifdef CONFIG_BLK_DEV_ZONED
 483         u64                     zsze;
 484 #endif
 485         unsigned long           features;
 486
 487         struct ratelimit_state  rs_nuse;
 488
 489         struct cdev             cdev;
 490         struct device           cdev_device;
 491
 492         struct gendisk          *disk;
 493 #ifdef CONFIG_NVME_MULTIPATH
 494         struct bio_list         requeue_list;
 495         spinlock_t              requeue_lock;
 496         struct work_struct      requeue_work;
 497         struct mutex            lock;
 498         unsigned long           flags;
 499 #define NVME_NSHEAD_DISK_LIVE   0
 500         struct nvme_ns __rcu    *current_path[];
 501 #endif
 502 };
 503
 504 static inline bool nvme_ns_head_multipath(struct nvme_ns_head *head)
 505 {
 506         return IS_ENABLED(CONFIG_NVME_MULTIPATH) && head->disk;
 507 }
 508
 509 enum nvme_ns_features {
 510         NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
 511         NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
 512         NVME_NS_DEAC = 1 << 2,          /* DEAC bit in Write Zeores supported */
 513 };
 514
 515 struct nvme_ns {
 516         struct list_head list;
 517
 518         struct nvme_ctrl *ctrl;
 519         struct request_queue *queue;
 520         struct gendisk *disk;
 521 #ifdef CONFIG_NVME_MULTIPATH
 522         enum nvme_ana_state ana_state;
 523         u32 ana_grpid;
 524 #endif
 525         struct list_head siblings;
 526         struct kref kref;
 527         struct nvme_ns_head *head;
 528
 529         unsigned long flags;
 530 #define NVME_NS_REMOVING        0
 531 #define NVME_NS_ANA_PENDING     2
 532 #define NVME_NS_FORCE_RO        3
 533 #define NVME_NS_READY           4
 534
 535         struct cdev             cdev;
 536         struct device           cdev_device;
 537
 538         struct nvme_fault_inject fault_inject;
 539 };
 540
 541 /* NVMe ns supports metadata actions by the controller (generate/strip) */
 542 static inline bool nvme_ns_has_pi(struct nvme_ns_head *head)
 543 {
 544         return head->pi_type && head->ms == head->pi_size;
 545 }
 546
 547 struct nvme_ctrl_ops {
 548         const char *name;
 549         struct module *module;
 550         unsigned int flags;
 551 #define NVME_F_FABRICS                  (1 << 0)
 552 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 553 #define NVME_F_BLOCKING                 (1 << 2)
 554
 555         const struct attribute_group **dev_attr_groups;
 556         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 557         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 558         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 559         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 560         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 561         int (*subsystem_reset)(struct nvme_ctrl *ctrl);
 562         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 563         void (*stop_ctrl)(struct nvme_ctrl *ctrl);
 564         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 565         void (*print_device_info)(struct nvme_ctrl *ctrl);
 566         bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl);
 567 };
 568
 569 /*
 570  * nvme command_id is constructed as such:
 571  * | xxxx | xxxxxxxxxxxx |
 572  *   gen    request tag
 573  */
 574 #define nvme_genctr_mask(gen)                   (gen & 0xf)
 575 #define nvme_cid_install_genctr(gen)            (nvme_genctr_mask(gen) << 12)
 576 #define nvme_genctr_from_cid(cid)               ((cid & 0xf000) >> 12)
 577 #define nvme_tag_from_cid(cid)                  (cid & 0xfff)
 578
 579 static inline u16 nvme_cid(struct request *rq)
 580 {
 581         return nvme_cid_install_genctr(nvme_req(rq)->genctr) | rq->tag;
 582 }
 583
 584 static inline struct request *nvme_find_rq(struct blk_mq_tags *tags,
 585                 u16 command_id)
 586 {
 587         u8 genctr = nvme_genctr_from_cid(command_id);
 588         u16 tag = nvme_tag_from_cid(command_id);
 589         struct request *rq;
 590
 591         rq = blk_mq_tag_to_rq(tags, tag);
 592         if (unlikely(!rq)) {
 593                 pr_err("could not locate request for tag %#x\n",
 594                         tag);
 595                 return NULL;
 596         }
 597         if (unlikely(nvme_genctr_mask(nvme_req(rq)->genctr) != genctr)) {
 598                 dev_err(nvme_req(rq)->ctrl->device,
 599                         "request %#x genctr mismatch (got %#x expected %#x)\n",
 600                         tag, genctr, nvme_genctr_mask(nvme_req(rq)->genctr));
 601                 return NULL;
 602         }
 603         return rq;
 604 }
 605
 606 static inline struct request *nvme_cid_to_rq(struct blk_mq_tags *tags,
 607                 u16 command_id)
 608 {
 609         return blk_mq_tag_to_rq(tags, nvme_tag_from_cid(command_id));
 610 }
 611
 612 /*
 613  * Return the length of the string without the space padding
 614  */
 615 static inline int nvme_strlen(char *s, int len)
 616 {
 617         while (s[len - 1] == ' ')
 618                 len--;
 619         return len;
 620 }
 621
 622 static inline void nvme_print_device_info(struct nvme_ctrl *ctrl)
 623 {
 624         struct nvme_subsystem *subsys = ctrl->subsys;
 625
 626         if (ctrl->ops->print_device_info) {
 627                 ctrl->ops->print_device_info(ctrl);
 628                 return;
 629         }
 630
 631         dev_err(ctrl->device,
 632                 "VID:%04x model:%.*s firmware:%.*s\n", subsys->vendor_id,
 633                 nvme_strlen(subsys->model, sizeof(subsys->model)),
 634                 subsys->model, nvme_strlen(subsys->firmware_rev,
 635                                            sizeof(subsys->firmware_rev)),
 636                 subsys->firmware_rev);
 637 }
 638
 639 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 640 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 641                             const char *dev_name);
 642 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 643 void nvme_should_fail(struct request *req);
 644 #else
 645 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 646                                           const char *dev_name)
 647 {
 648 }
 649 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 650 {
 651 }
 652 static inline void nvme_should_fail(struct request *req) {}
 653 #endif
 654
 655 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 656 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 657
 658 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 659 {
 660         if (!ctrl->subsystem || !ctrl->ops->subsystem_reset)
 661                 return -ENOTTY;
 662         return ctrl->ops->subsystem_reset(ctrl);
 663 }
 664
 665 /*
 666  * Convert a 512B sector number to a device logical block number.
 667  */
 668 static inline u64 nvme_sect_to_lba(struct nvme_ns_head *head, sector_t sector)
 669 {
 670         return sector >> (head->lba_shift - SECTOR_SHIFT);
 671 }
 672
 673 /*
 674  * Convert a device logical block number to a 512B sector number.
 675  */
 676 static inline sector_t nvme_lba_to_sect(struct nvme_ns_head *head, u64 lba)
 677 {
 678         return lba << (head->lba_shift - SECTOR_SHIFT);
 679 }
 680
 681 /*
 682  * Convert byte length to nvme's 0-based num dwords
 683  */
 684 static inline u32 nvme_bytes_to_numd(size_t len)
 685 {
 686         return (len >> 2) - 1;
 687 }
 688
 689 static inline bool nvme_is_ana_error(u16 status)
 690 {
 691         switch (status & NVME_SCT_SC_MASK) {
 692         case NVME_SC_ANA_TRANSITION:
 693         case NVME_SC_ANA_INACCESSIBLE:
 694         case NVME_SC_ANA_PERSISTENT_LOSS:
 695                 return true;
 696         default:
 697                 return false;
 698         }
 699 }
 700
 701 static inline bool nvme_is_path_error(u16 status)
 702 {
 703         /* check for a status code type of 'path related status' */
 704         return (status & NVME_SCT_MASK) == NVME_SCT_PATH;
 705 }
 706
 707 /*
 708  * Fill in the status and result information from the CQE, and then figure out
 709  * if blk-mq will need to use IPI magic to complete the request, and if yes do
 710  * so.  If not let the caller complete the request without an indirect function
 711  * call.
 712  */
 713 static inline bool nvme_try_complete_req(struct request *req, __le16 status,
 714                 union nvme_result result)
 715 {
 716         struct nvme_request *rq = nvme_req(req);
 717         struct nvme_ctrl *ctrl = rq->ctrl;
 718
 719         if (!(ctrl->quirks & NVME_QUIRK_SKIP_CID_GEN))
 720                 rq->genctr++;
 721
 722         rq->status = le16_to_cpu(status) >> 1;
 723         rq->result = result;
 724         /* inject error when permitted by fault injection framework */
 725         nvme_should_fail(req);
 726         if (unlikely(blk_should_fake_timeout(req->q)))
 727                 return true;
 728         return blk_mq_complete_request_remote(req);
 729 }
 730
 731 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 732 {
 733         get_device(ctrl->device);
 734 }
 735
 736 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 737 {
 738         put_device(ctrl->device);
 739 }
 740
 741 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 742 {
 743         return !qid &&
 744                 nvme_tag_from_cid(command_id) >= NVME_AQ_BLK_MQ_DEPTH;
 745 }
 746
 747 /*
 748  * Returns true for sink states that can't ever transition back to live.
 749  */
 750 static inline bool nvme_state_terminal(struct nvme_ctrl *ctrl)
 751 {
 752         switch (nvme_ctrl_state(ctrl)) {
 753         case NVME_CTRL_NEW:
 754         case NVME_CTRL_LIVE:
 755         case NVME_CTRL_RESETTING:
 756         case NVME_CTRL_CONNECTING:
 757                 return false;
 758         case NVME_CTRL_DELETING:
 759         case NVME_CTRL_DELETING_NOIO:
 760         case NVME_CTRL_DEAD:
 761                 return true;
 762         default:
 763                 WARN_ONCE(1, "Unhandled ctrl state:%d", ctrl->state);
 764                 return true;
 765         }
 766 }
 767
 768 void nvme_end_req(struct request *req);
 769 void nvme_complete_rq(struct request *req);
 770 void nvme_complete_batch_req(struct request *req);
 771
 772 static __always_inline void nvme_complete_batch(struct io_comp_batch *iob,
 773                                                 void (*fn)(struct request *rq))
 774 {
 775         struct request *req;
 776
 777         rq_list_for_each(&iob->req_list, req) {
 778                 fn(req);
 779                 nvme_complete_batch_req(req);
 780         }
 781         blk_mq_end_request_batch(iob);
 782 }
 783
 784 blk_status_t nvme_host_path_error(struct request *req);
 785 bool nvme_cancel_request(struct request *req, void *data);
 786 void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
 787 void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
 788 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 789                 enum nvme_ctrl_state new_state);
 790 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, bool shutdown);
 791 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 792 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 793                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 794 int nvme_add_ctrl(struct nvme_ctrl *ctrl);
 795 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 796 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 797 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 798 int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl, bool was_suspended);
 799 int nvme_alloc_admin_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 800                 const struct blk_mq_ops *ops, unsigned int cmd_size);
 801 void nvme_remove_admin_tag_set(struct nvme_ctrl *ctrl);
 802 int nvme_alloc_io_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 803                 const struct blk_mq_ops *ops, unsigned int nr_maps,
 804                 unsigned int cmd_size);
 805 void nvme_remove_io_tag_set(struct nvme_ctrl *ctrl);
 806
 807 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 808
 809 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 810                 volatile union nvme_result *res);
 811
 812 void nvme_quiesce_io_queues(struct nvme_ctrl *ctrl);
 813 void nvme_unquiesce_io_queues(struct nvme_ctrl *ctrl);
 814 void nvme_quiesce_admin_queue(struct nvme_ctrl *ctrl);
 815 void nvme_unquiesce_admin_queue(struct nvme_ctrl *ctrl);
 816 void nvme_mark_namespaces_dead(struct nvme_ctrl *ctrl);
 817 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 818 void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
 819 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 820 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 821 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 822 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 823
 824 static inline enum req_op nvme_req_op(struct nvme_command *cmd)
 825 {
 826         return nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
 827 }
 828
 829 #define NVME_QID_ANY -1
 830 void nvme_init_request(struct request *req, struct nvme_command *cmd);
 831 void nvme_cleanup_cmd(struct request *req);
 832 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req);
 833 blk_status_t nvme_fail_nonready_command(struct nvme_ctrl *ctrl,
 834                 struct request *req);
 835 bool __nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
 836                 bool queue_live, enum nvme_ctrl_state state);
 837
 838 static inline bool nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
 839                 bool queue_live)
 840 {
 841         enum nvme_ctrl_state state = nvme_ctrl_state(ctrl);
 842
 843         if (likely(state == NVME_CTRL_LIVE))
 844                 return true;
 845         if (ctrl->ops->flags & NVME_F_FABRICS && state == NVME_CTRL_DELETING)
 846                 return queue_live;
 847         return __nvme_check_ready(ctrl, rq, queue_live, state);
 848 }
 849
 850 /*
 851  * NSID shall be unique for all shared namespaces, or if at least one of the
 852  * following conditions is met:
 853  *   1. Namespace Management is supported by the controller
 854  *   2. ANA is supported by the controller
 855  *   3. NVM Set are supported by the controller
 856  *
 857  * In other case, private namespace are not required to report a unique NSID.
 858  */
 859 static inline bool nvme_is_unique_nsid(struct nvme_ctrl *ctrl,
 860                 struct nvme_ns_head *head)
 861 {
 862         return head->shared ||
 863                 (ctrl->oacs & NVME_CTRL_OACS_NS_MNGT_SUPP) ||
 864                 (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA) ||
 865                 (ctrl->ctratt & NVME_CTRL_CTRATT_NVM_SETS);
 866 }
 867
 868 /*
 869  * Flags for __nvme_submit_sync_cmd()
 870  */
 871 typedef __u32 __bitwise nvme_submit_flags_t;
 872
 873 enum {
 874         /* Insert request at the head of the queue */
 875         NVME_SUBMIT_AT_HEAD  = (__force nvme_submit_flags_t)(1 << 0),
 876         /* Set BLK_MQ_REQ_NOWAIT when allocating request */
 877         NVME_SUBMIT_NOWAIT = (__force nvme_submit_flags_t)(1 << 1),
 878         /* Set BLK_MQ_REQ_RESERVED when allocating request */
 879         NVME_SUBMIT_RESERVED = (__force nvme_submit_flags_t)(1 << 2),
 880         /* Retry command when NVME_STATUS_DNR is not set in the result */
 881         NVME_SUBMIT_RETRY = (__force nvme_submit_flags_t)(1 << 3),
 882 };
 883
 884 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 885                 void *buf, unsigned bufflen);
 886 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 887                 union nvme_result *result, void *buffer, unsigned bufflen,
 888                 int qid, nvme_submit_flags_t flags);
 889 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 890                       unsigned int dword11, void *buffer, size_t buflen,
 891                       u32 *result);
 892 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 893                       unsigned int dword11, void *buffer, size_t buflen,
 894                       u32 *result);
 895 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 896 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 897 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 898 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 899 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 900 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 901 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
 902                 void *log, size_t size, u64 offset);
 903 bool nvme_tryget_ns_head(struct nvme_ns_head *head);
 904 void nvme_put_ns_head(struct nvme_ns_head *head);
 905 int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device,
 906                 const struct file_operations *fops, struct module *owner);
 907 void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device);
 908 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode,
 909                 unsigned int cmd, unsigned long arg);
 910 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 911 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode,
 912                 unsigned int cmd, unsigned long arg);
 913 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
 914                 unsigned long arg);
 915 long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 916                 unsigned long arg);
 917 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
 918                 struct io_comp_batch *iob, unsigned int poll_flags);
 919 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 920                 unsigned int issue_flags);
 921 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 922                 unsigned int issue_flags);
 923 int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid,
 924                 struct nvme_id_ns **id);
 925 int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 926 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
 927
 928 extern const struct attribute_group *nvme_ns_attr_groups[];
 929 extern const struct pr_ops nvme_pr_ops;
 930 extern const struct block_device_operations nvme_ns_head_ops;
 931 extern const struct attribute_group nvme_dev_attrs_group;
 932 extern const struct attribute_group *nvme_subsys_attrs_groups[];
 933 extern const struct attribute_group *nvme_dev_attr_groups[];
 934 extern const struct block_device_operations nvme_bdev_ops;
 935
 936 void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
 937 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 938 #ifdef CONFIG_NVME_MULTIPATH
 939 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 940 {
 941         return ctrl->ana_log_buf != NULL;
 942 }
 943
 944 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 945 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 946 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 947 void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys);
 948 void nvme_failover_req(struct request *req);
 949 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 950 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 951 void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid);
 952 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 953 int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 954 void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl);
 955 void nvme_mpath_update(struct nvme_ctrl *ctrl);
 956 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 957 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 958 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 959 void nvme_mpath_revalidate_paths(struct nvme_ns *ns);
 960 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 961 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head);
 962 void nvme_mpath_start_request(struct request *rq);
 963 void nvme_mpath_end_request(struct request *rq);
 964
 965 static inline void nvme_trace_bio_complete(struct request *req)
 966 {
 967         struct nvme_ns *ns = req->q->queuedata;
 968
 969         if ((req->cmd_flags & REQ_NVME_MPATH) && req->bio)
 970                 trace_block_bio_complete(ns->head->disk->queue, req->bio);
 971 }
 972
 973 extern bool multipath;
 974 extern struct device_attribute dev_attr_ana_grpid;
 975 extern struct device_attribute dev_attr_ana_state;
 976 extern struct device_attribute subsys_attr_iopolicy;
 977
 978 static inline bool nvme_disk_is_ns_head(struct gendisk *disk)
 979 {
 980         return disk->fops == &nvme_ns_head_ops;
 981 }
 982 #else
 983 #define multipath false
 984 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 985 {
 986         return false;
 987 }
 988 static inline void nvme_failover_req(struct request *req)
 989 {
 990 }
 991 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 992 {
 993 }
 994 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 995                 struct nvme_ns_head *head)
 996 {
 997         return 0;
 998 }
 999 static inline void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid)
1000 {
1001 }
1002 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
1003 {
1004 }
1005 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
1006 {
1007         return false;
1008 }
1009 static inline void nvme_mpath_revalidate_paths(struct nvme_ns *ns)
1010 {
1011 }
1012 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
1013 {
1014 }
1015 static inline void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)
1016 {
1017 }
1018 static inline void nvme_trace_bio_complete(struct request *req)
1019 {
1020 }
1021 static inline void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)
1022 {
1023 }
1024 static inline int nvme_mpath_init_identify(struct nvme_ctrl *ctrl,
1025                 struct nvme_id_ctrl *id)
1026 {
1027         if (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)
1028                 dev_warn(ctrl->device,
1029 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
1030         return 0;
1031 }
1032 static inline void nvme_mpath_update(struct nvme_ctrl *ctrl)
1033 {
1034 }
1035 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
1036 {
1037 }
1038 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
1039 {
1040 }
1041 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
1042 {
1043 }
1044 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
1045 {
1046 }
1047 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
1048 {
1049 }
1050 static inline void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
1051 {
1052 }
1053 static inline void nvme_mpath_start_request(struct request *rq)
1054 {
1055 }
1056 static inline void nvme_mpath_end_request(struct request *rq)
1057 {
1058 }
1059 static inline bool nvme_disk_is_ns_head(struct gendisk *disk)
1060 {
1061         return false;
1062 }
1063 #endif /* CONFIG_NVME_MULTIPATH */
1064
1065 int nvme_ns_get_unique_id(struct nvme_ns *ns, u8 id[16],
1066                 enum blk_unique_id type);
1067
1068 struct nvme_zone_info {
1069         u64 zone_size;
1070         unsigned int max_open_zones;
1071         unsigned int max_active_zones;
1072 };
1073
1074 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
1075                 unsigned int nr_zones, report_zones_cb cb, void *data);
1076 int nvme_query_zone_info(struct nvme_ns *ns, unsigned lbaf,
1077                 struct nvme_zone_info *zi);
1078 void nvme_update_zone_info(struct nvme_ns *ns, struct queue_limits *lim,
1079                 struct nvme_zone_info *zi);
1080 #ifdef CONFIG_BLK_DEV_ZONED
1081 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
1082                                        struct nvme_command *cmnd,
1083                                        enum nvme_zone_mgmt_action action);
1084 #else
1085 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
1086                 struct request *req, struct nvme_command *cmnd,
1087                 enum nvme_zone_mgmt_action action)
1088 {
1089         return BLK_STS_NOTSUPP;
1090 }
1091 #endif
1092
1093 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
1094 {
1095         struct gendisk *disk = dev_to_disk(dev);
1096
1097         WARN_ON(nvme_disk_is_ns_head(disk));
1098         return disk->private_data;
1099 }
1100
1101 #ifdef CONFIG_NVME_HWMON
1102 int nvme_hwmon_init(struct nvme_ctrl *ctrl);
1103 void nvme_hwmon_exit(struct nvme_ctrl *ctrl);
1104 #else
1105 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
1106 {
1107         return 0;
1108 }
1109
1110 static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
1111 {
1112 }
1113 #endif
1114
1115 static inline void nvme_start_request(struct request *rq)
1116 {
1117         if (rq->cmd_flags & REQ_NVME_MPATH)
1118                 nvme_mpath_start_request(rq);
1119         blk_mq_start_request(rq);
1120 }
1121
1122 static inline bool nvme_ctrl_sgl_supported(struct nvme_ctrl *ctrl)
1123 {
1124         return ctrl->sgls & ((1 << 0) | (1 << 1));
1125 }
1126
1127 #ifdef CONFIG_NVME_HOST_AUTH
1128 int __init nvme_init_auth(void);
1129 void __exit nvme_exit_auth(void);
1130 int nvme_auth_init_ctrl(struct nvme_ctrl *ctrl);
1131 void nvme_auth_stop(struct nvme_ctrl *ctrl);
1132 int nvme_auth_negotiate(struct nvme_ctrl *ctrl, int qid);
1133 int nvme_auth_wait(struct nvme_ctrl *ctrl, int qid);
1134 void nvme_auth_free(struct nvme_ctrl *ctrl);
1135 #else
1136 static inline int nvme_auth_init_ctrl(struct nvme_ctrl *ctrl)
1137 {
1138         return 0;
1139 }
1140 static inline int __init nvme_init_auth(void)
1141 {
1142         return 0;
1143 }
1144 static inline void __exit nvme_exit_auth(void)
1145 {
1146 }
1147 static inline void nvme_auth_stop(struct nvme_ctrl *ctrl) {};
1148 static inline int nvme_auth_negotiate(struct nvme_ctrl *ctrl, int qid)
1149 {
1150         return -EPROTONOSUPPORT;
1151 }
1152 static inline int nvme_auth_wait(struct nvme_ctrl *ctrl, int qid)
1153 {
1154         return -EPROTONOSUPPORT;
1155 }
1156 static inline void nvme_auth_free(struct nvme_ctrl *ctrl) {};
1157 #endif
1158
1159 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1160                          u8 opcode);
1161 u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode);
1162 int nvme_execute_rq(struct request *rq, bool at_head);
1163 void nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
1164                        struct nvme_command *cmd, int status);
1165 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
1166 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
1167 bool nvme_get_ns(struct nvme_ns *ns);
1168 void nvme_put_ns(struct nvme_ns *ns);
1169
1170 static inline bool nvme_multi_css(struct nvme_ctrl *ctrl)
1171 {
1172         return (ctrl->ctrl_config & NVME_CC_CSS_MASK) == NVME_CC_CSS_CSI;
1173 }
1174
1175 #ifdef CONFIG_NVME_VERBOSE_ERRORS
1176 const char *nvme_get_error_status_str(u16 status);
1177 const char *nvme_get_opcode_str(u8 opcode);
1178 const char *nvme_get_admin_opcode_str(u8 opcode);
1179 const char *nvme_get_fabrics_opcode_str(u8 opcode);
1180 #else /* CONFIG_NVME_VERBOSE_ERRORS */
1181 static inline const char *nvme_get_error_status_str(u16 status)
1182 {
1183         return "I/O Error";
1184 }
1185 static inline const char *nvme_get_opcode_str(u8 opcode)
1186 {
1187         return "I/O Cmd";
1188 }
1189 static inline const char *nvme_get_admin_opcode_str(u8 opcode)
1190 {
1191         return "Admin Cmd";
1192 }
1193
1194 static inline const char *nvme_get_fabrics_opcode_str(u8 opcode)
1195 {
1196         return "Fabrics Cmd";
1197 }
1198 #endif /* CONFIG_NVME_VERBOSE_ERRORS */
1199
1200 static inline const char *nvme_opcode_str(int qid, u8 opcode)
1201 {
1202         return qid ? nvme_get_opcode_str(opcode) :
1203                 nvme_get_admin_opcode_str(opcode);
1204 }
1205
1206 static inline const char *nvme_fabrics_opcode_str(
1207                 int qid, const struct nvme_command *cmd)
1208 {
1209         if (nvme_is_fabrics(cmd))
1210                 return nvme_get_fabrics_opcode_str(cmd->fabrics.fctype);
1211
1212         return nvme_opcode_str(qid, cmd->common.opcode);
1213 }
1214 #endif /* _NVME_H */