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 NVME_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 /*
  41  * Default to a 4K page size, with the intention to update this
  42  * path in the future to accommodate architectures with differing
  43  * kernel and IO page sizes.
  44  */
  45 #define NVME_CTRL_PAGE_SHIFT    12
  46 #define NVME_CTRL_PAGE_SIZE     (1 << NVME_CTRL_PAGE_SHIFT)
  47
  48 extern struct workqueue_struct *nvme_wq;
  49 extern struct workqueue_struct *nvme_reset_wq;
  50 extern struct workqueue_struct *nvme_delete_wq;
  51
  52 enum {
  53         NVME_NS_LBA             = 0,
  54         NVME_NS_LIGHTNVM        = 1,
  55 };
  56
  57 /*
  58  * List of workarounds for devices that required behavior not specified in
  59  * the standard.
  60  */
  61 enum nvme_quirks {
  62         /*
  63          * Prefers I/O aligned to a stripe size specified in a vendor
  64          * specific Identify field.
  65          */
  66         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  67
  68         /*
  69          * The controller doesn't handle Identify value others than 0 or 1
  70          * correctly.
  71          */
  72         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  73
  74         /*
  75          * The controller deterministically returns O's on reads to
  76          * logical blocks that deallocate was called on.
  77          */
  78         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  79
  80         /*
  81          * The controller needs a delay before starts checking the device
  82          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  83          */
  84         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  85
  86         /*
  87          * APST should not be used.
  88          */
  89         NVME_QUIRK_NO_APST                      = (1 << 4),
  90
  91         /*
  92          * The deepest sleep state should not be used.
  93          */
  94         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  95
  96         /*
  97          * Supports the LighNVM command set if indicated in vs[1].
  98          */
  99         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
 100
 101         /*
 102          * Set MEDIUM priority on SQ creation
 103          */
 104         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
 105
 106         /*
 107          * Ignore device provided subnqn.
 108          */
 109         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
 110
 111         /*
 112          * Broken Write Zeroes.
 113          */
 114         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
 115
 116         /*
 117          * Force simple suspend/resume path.
 118          */
 119         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 120
 121         /*
 122          * Use only one interrupt vector for all queues
 123          */
 124         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 125
 126         /*
 127          * Use non-standard 128 bytes SQEs.
 128          */
 129         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 130
 131         /*
 132          * Prevent tag overlap between queues
 133          */
 134         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 135
 136         /*
 137          * Don't change the value of the temperature threshold feature
 138          */
 139         NVME_QUIRK_NO_TEMP_THRESH_CHANGE        = (1 << 14),
 140
 141         /*
 142          * The controller doesn't handle the Identify Namespace
 143          * Identification Descriptor list subcommand despite claiming
 144          * NVMe 1.3 compliance.
 145          */
 146         NVME_QUIRK_NO_NS_DESC_LIST              = (1 << 15),
 147
 148         /*
 149          * The controller does not properly handle DMA addresses over
 150          * 48 bits.
 151          */
 152         NVME_QUIRK_DMA_ADDRESS_BITS_48          = (1 << 16),
 153 };
 154
 155 /*
 156  * Common request structure for NVMe passthrough.  All drivers must have
 157  * this structure as the first member of their request-private data.
 158  */
 159 struct nvme_request {
 160         struct nvme_command     *cmd;
 161         union nvme_result       result;
 162         u8                      retries;
 163         u8                      flags;
 164         u16                     status;
 165         struct nvme_ctrl        *ctrl;
 166 };
 167
 168 /*
 169  * Mark a bio as coming in through the mpath node.
 170  */
 171 #define REQ_NVME_MPATH          REQ_DRV
 172
 173 enum {
 174         NVME_REQ_CANCELLED              = (1 << 0),
 175         NVME_REQ_USERCMD                = (1 << 1),
 176 };
 177
 178 static inline struct nvme_request *nvme_req(struct request *req)
 179 {
 180         return blk_mq_rq_to_pdu(req);
 181 }
 182
 183 static inline u16 nvme_req_qid(struct request *req)
 184 {
 185         if (!req->q->queuedata)
 186                 return 0;
 187
 188         return req->mq_hctx->queue_num + 1;
 189 }
 190
 191 /* The below value is the specific amount of delay needed before checking
 192  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 193  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 194  * found empirically.
 195  */
 196 #define NVME_QUIRK_DELAY_AMOUNT         2300
 197
 198 /*
 199  * enum nvme_ctrl_state: Controller state
 200  *
 201  * @NVME_CTRL_NEW:              New controller just allocated, initial state
 202  * @NVME_CTRL_LIVE:             Controller is connected and I/O capable
 203  * @NVME_CTRL_RESETTING:        Controller is resetting (or scheduled reset)
 204  * @NVME_CTRL_CONNECTING:       Controller is disconnected, now connecting the
 205  *                              transport
 206  * @NVME_CTRL_DELETING:         Controller is deleting (or scheduled deletion)
 207  * @NVME_CTRL_DELETING_NOIO:    Controller is deleting and I/O is not
 208  *                              disabled/failed immediately. This state comes
 209  *                              after all async event processing took place and
 210  *                              before ns removal and the controller deletion
 211  *                              progress
 212  * @NVME_CTRL_DEAD:             Controller is non-present/unresponsive during
 213  *                              shutdown or removal. In this case we forcibly
 214  *                              kill all inflight I/O as they have no chance to
 215  *                              complete
 216  */
 217 enum nvme_ctrl_state {
 218         NVME_CTRL_NEW,
 219         NVME_CTRL_LIVE,
 220         NVME_CTRL_RESETTING,
 221         NVME_CTRL_CONNECTING,
 222         NVME_CTRL_DELETING,
 223         NVME_CTRL_DELETING_NOIO,
 224         NVME_CTRL_DEAD,
 225 };
 226
 227 struct nvme_fault_inject {
 228 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 229         struct fault_attr attr;
 230         struct dentry *parent;
 231         bool dont_retry;        /* DNR, do not retry */
 232         u16 status;             /* status code */
 233 #endif
 234 };
 235
 236 struct nvme_ctrl {
 237         bool comp_seen;
 238         enum nvme_ctrl_state state;
 239         bool identified;
 240         spinlock_t lock;
 241         struct mutex scan_lock;
 242         const struct nvme_ctrl_ops *ops;
 243         struct request_queue *admin_q;
 244         struct request_queue *connect_q;
 245         struct request_queue *fabrics_q;
 246         struct device *dev;
 247         int instance;
 248         int numa_node;
 249         struct blk_mq_tag_set *tagset;
 250         struct blk_mq_tag_set *admin_tagset;
 251         struct list_head namespaces;
 252         struct rw_semaphore namespaces_rwsem;
 253         struct device ctrl_device;
 254         struct device *device;  /* char device */
 255 #ifdef CONFIG_NVME_HWMON
 256         struct device *hwmon_device;
 257 #endif
 258         struct cdev cdev;
 259         struct work_struct reset_work;
 260         struct work_struct delete_work;
 261         wait_queue_head_t state_wq;
 262
 263         struct nvme_subsystem *subsys;
 264         struct list_head subsys_entry;
 265
 266         struct opal_dev *opal_dev;
 267
 268         char name[12];
 269         u16 cntlid;
 270
 271         u32 ctrl_config;
 272         u16 mtfa;
 273         u32 queue_count;
 274
 275         u64 cap;
 276         u32 max_hw_sectors;
 277         u32 max_segments;
 278         u32 max_integrity_segments;
 279 #ifdef CONFIG_BLK_DEV_ZONED
 280         u32 max_zone_append;
 281 #endif
 282         u16 crdt[3];
 283         u16 oncs;
 284         u16 oacs;
 285         u16 nssa;
 286         u16 nr_streams;
 287         u16 sqsize;
 288         u32 max_namespaces;
 289         atomic_t abort_limit;
 290         u8 vwc;
 291         u32 vs;
 292         u32 sgls;
 293         u16 kas;
 294         u8 npss;
 295         u8 apsta;
 296         u16 wctemp;
 297         u16 cctemp;
 298         u32 oaes;
 299         u32 aen_result;
 300         u32 ctratt;
 301         unsigned int shutdown_timeout;
 302         unsigned int kato;
 303         bool subsystem;
 304         unsigned long quirks;
 305         struct nvme_id_power_state psd[32];
 306         struct nvme_effects_log *effects;
 307         struct xarray cels;
 308         struct work_struct scan_work;
 309         struct work_struct async_event_work;
 310         struct delayed_work ka_work;
 311         struct delayed_work failfast_work;
 312         struct nvme_command ka_cmd;
 313         struct work_struct fw_act_work;
 314         unsigned long events;
 315
 316 #ifdef CONFIG_NVME_MULTIPATH
 317         /* asymmetric namespace access: */
 318         u8 anacap;
 319         u8 anatt;
 320         u32 anagrpmax;
 321         u32 nanagrpid;
 322         struct mutex ana_lock;
 323         struct nvme_ana_rsp_hdr *ana_log_buf;
 324         size_t ana_log_size;
 325         struct timer_list anatt_timer;
 326         struct work_struct ana_work;
 327 #endif
 328
 329         /* Power saving configuration */
 330         u64 ps_max_latency_us;
 331         bool apst_enabled;
 332
 333         /* PCIe only: */
 334         u32 hmpre;
 335         u32 hmmin;
 336         u32 hmminds;
 337         u16 hmmaxd;
 338
 339         /* Fabrics only */
 340         u32 ioccsz;
 341         u32 iorcsz;
 342         u16 icdoff;
 343         u16 maxcmd;
 344         int nr_reconnects;
 345         unsigned long flags;
 346 #define NVME_CTRL_FAILFAST_EXPIRED      0
 347         struct nvmf_ctrl_options *opts;
 348
 349         struct page *discard_page;
 350         unsigned long discard_page_busy;
 351
 352         struct nvme_fault_inject fault_inject;
 353 };
 354
 355 enum nvme_iopolicy {
 356         NVME_IOPOLICY_NUMA,
 357         NVME_IOPOLICY_RR,
 358 };
 359
 360 struct nvme_subsystem {
 361         int                     instance;
 362         struct device           dev;
 363         /*
 364          * Because we unregister the device on the last put we need
 365          * a separate refcount.
 366          */
 367         struct kref             ref;
 368         struct list_head        entry;
 369         struct mutex            lock;
 370         struct list_head        ctrls;
 371         struct list_head        nsheads;
 372         char                    subnqn[NVMF_NQN_SIZE];
 373         char                    serial[20];
 374         char                    model[40];
 375         char                    firmware_rev[8];
 376         u8                      cmic;
 377         u16                     vendor_id;
 378         u16                     awupf;  /* 0's based awupf value. */
 379         struct ida              ns_ida;
 380 #ifdef CONFIG_NVME_MULTIPATH
 381         enum nvme_iopolicy      iopolicy;
 382 #endif
 383 };
 384
 385 /*
 386  * Container structure for uniqueue namespace identifiers.
 387  */
 388 struct nvme_ns_ids {
 389         u8      eui64[8];
 390         u8      nguid[16];
 391         uuid_t  uuid;
 392         u8      csi;
 393 };
 394
 395 /*
 396  * Anchor structure for namespaces.  There is one for each namespace in a
 397  * NVMe subsystem that any of our controllers can see, and the namespace
 398  * structure for each controller is chained of it.  For private namespaces
 399  * there is a 1:1 relation to our namespace structures, that is ->list
 400  * only ever has a single entry for private namespaces.
 401  */
 402 struct nvme_ns_head {
 403         struct list_head        list;
 404         struct srcu_struct      srcu;
 405         struct nvme_subsystem   *subsys;
 406         unsigned                ns_id;
 407         struct nvme_ns_ids      ids;
 408         struct list_head        entry;
 409         struct kref             ref;
 410         bool                    shared;
 411         int                     instance;
 412         struct nvme_effects_log *effects;
 413 #ifdef CONFIG_NVME_MULTIPATH
 414         struct gendisk          *disk;
 415         struct bio_list         requeue_list;
 416         spinlock_t              requeue_lock;
 417         struct work_struct      requeue_work;
 418         struct mutex            lock;
 419         unsigned long           flags;
 420 #define NVME_NSHEAD_DISK_LIVE   0
 421         struct nvme_ns __rcu    *current_path[];
 422 #endif
 423 };
 424
 425 enum nvme_ns_features {
 426         NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
 427         NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
 428 };
 429
 430 struct nvme_ns {
 431         struct list_head list;
 432
 433         struct nvme_ctrl *ctrl;
 434         struct request_queue *queue;
 435         struct gendisk *disk;
 436 #ifdef CONFIG_NVME_MULTIPATH
 437         enum nvme_ana_state ana_state;
 438         u32 ana_grpid;
 439 #endif
 440         struct list_head siblings;
 441         struct nvm_dev *ndev;
 442         struct kref kref;
 443         struct nvme_ns_head *head;
 444
 445         int lba_shift;
 446         u16 ms;
 447         u16 sgs;
 448         u32 sws;
 449         u8 pi_type;
 450 #ifdef CONFIG_BLK_DEV_ZONED
 451         u64 zsze;
 452 #endif
 453         unsigned long features;
 454         unsigned long flags;
 455 #define NVME_NS_REMOVING        0
 456 #define NVME_NS_DEAD            1
 457 #define NVME_NS_ANA_PENDING     2
 458 #define NVME_NS_FORCE_RO        3
 459
 460         struct nvme_fault_inject fault_inject;
 461
 462 };
 463
 464 /* NVMe ns supports metadata actions by the controller (generate/strip) */
 465 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
 466 {
 467         return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
 468 }
 469
 470 struct nvme_ctrl_ops {
 471         const char *name;
 472         struct module *module;
 473         unsigned int flags;
 474 #define NVME_F_FABRICS                  (1 << 0)
 475 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 476 #define NVME_F_PCI_P2PDMA               (1 << 2)
 477         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 478         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 479         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 480         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 481         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 482         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 483         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 484 };
 485
 486 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 487 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 488                             const char *dev_name);
 489 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 490 void nvme_should_fail(struct request *req);
 491 #else
 492 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 493                                           const char *dev_name)
 494 {
 495 }
 496 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 497 {
 498 }
 499 static inline void nvme_should_fail(struct request *req) {}
 500 #endif
 501
 502 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 503 {
 504         if (!ctrl->subsystem)
 505                 return -ENOTTY;
 506         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 507 }
 508
 509 /*
 510  * Convert a 512B sector number to a device logical block number.
 511  */
 512 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
 513 {
 514         return sector >> (ns->lba_shift - SECTOR_SHIFT);
 515 }
 516
 517 /*
 518  * Convert a device logical block number to a 512B sector number.
 519  */
 520 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
 521 {
 522         return lba << (ns->lba_shift - SECTOR_SHIFT);
 523 }
 524
 525 /*
 526  * Convert byte length to nvme's 0-based num dwords
 527  */
 528 static inline u32 nvme_bytes_to_numd(size_t len)
 529 {
 530         return (len >> 2) - 1;
 531 }
 532
 533 static inline bool nvme_is_ana_error(u16 status)
 534 {
 535         switch (status & 0x7ff) {
 536         case NVME_SC_ANA_TRANSITION:
 537         case NVME_SC_ANA_INACCESSIBLE:
 538         case NVME_SC_ANA_PERSISTENT_LOSS:
 539                 return true;
 540         default:
 541                 return false;
 542         }
 543 }
 544
 545 static inline bool nvme_is_path_error(u16 status)
 546 {
 547         /* check for a status code type of 'path related status' */
 548         return (status & 0x700) == 0x300;
 549 }
 550
 551 /*
 552  * Fill in the status and result information from the CQE, and then figure out
 553  * if blk-mq will need to use IPI magic to complete the request, and if yes do
 554  * so.  If not let the caller complete the request without an indirect function
 555  * call.
 556  */
 557 static inline bool nvme_try_complete_req(struct request *req, __le16 status,
 558                 union nvme_result result)
 559 {
 560         struct nvme_request *rq = nvme_req(req);
 561
 562         rq->status = le16_to_cpu(status) >> 1;
 563         rq->result = result;
 564         /* inject error when permitted by fault injection framework */
 565         nvme_should_fail(req);
 566         if (unlikely(blk_should_fake_timeout(req->q)))
 567                 return true;
 568         return blk_mq_complete_request_remote(req);
 569 }
 570
 571 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 572 {
 573         get_device(ctrl->device);
 574 }
 575
 576 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 577 {
 578         put_device(ctrl->device);
 579 }
 580
 581 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 582 {
 583         return !qid && command_id >= NVME_AQ_BLK_MQ_DEPTH;
 584 }
 585
 586 void nvme_complete_rq(struct request *req);
 587 blk_status_t nvme_host_path_error(struct request *req);
 588 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 589 void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
 590 void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
 591 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 592                 enum nvme_ctrl_state new_state);
 593 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 594 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
 595 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 596 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 597 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 598                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 599 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 600 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 601 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 602 int nvme_init_identify(struct nvme_ctrl *ctrl);
 603
 604 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 605
 606 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 607                 bool send);
 608
 609 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 610                 volatile union nvme_result *res);
 611
 612 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 613 void nvme_start_queues(struct nvme_ctrl *ctrl);
 614 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 615 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 616 void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
 617 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 618 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 619 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 620 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 621
 622 #define NVME_QID_ANY -1
 623 struct request *nvme_alloc_request(struct request_queue *q,
 624                 struct nvme_command *cmd, blk_mq_req_flags_t flags);
 625 void nvme_cleanup_cmd(struct request *req);
 626 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 627                 struct nvme_command *cmd);
 628 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 629                 void *buf, unsigned bufflen);
 630 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 631                 union nvme_result *result, void *buffer, unsigned bufflen,
 632                 unsigned timeout, int qid, int at_head,
 633                 blk_mq_req_flags_t flags, bool poll);
 634 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 635                       unsigned int dword11, void *buffer, size_t buflen,
 636                       u32 *result);
 637 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 638                       unsigned int dword11, void *buffer, size_t buflen,
 639                       u32 *result);
 640 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 641 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 642 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 643 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 644 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 645
 646 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
 647                 void *log, size_t size, u64 offset);
 648 struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
 649                 struct nvme_ns_head **head, int *srcu_idx);
 650 void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx);
 651
 652 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 653 extern const struct block_device_operations nvme_ns_head_ops;
 654
 655 #ifdef CONFIG_NVME_MULTIPATH
 656 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 657 {
 658         return ctrl->ana_log_buf != NULL;
 659 }
 660
 661 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 662 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 663 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 664 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 665                         struct nvme_ctrl *ctrl, int *flags);
 666 void nvme_failover_req(struct request *req);
 667 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 668 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 669 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 670 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 671 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 672 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 673 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 674 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 675 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 676 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 677 blk_qc_t nvme_ns_head_submit_bio(struct bio *bio);
 678
 679 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 680 {
 681         struct nvme_ns_head *head = ns->head;
 682
 683         if (head->disk && list_empty(&head->list))
 684                 kblockd_schedule_work(&head->requeue_work);
 685 }
 686
 687 static inline void nvme_trace_bio_complete(struct request *req)
 688 {
 689         struct nvme_ns *ns = req->q->queuedata;
 690
 691         if (req->cmd_flags & REQ_NVME_MPATH)
 692                 trace_block_bio_complete(ns->head->disk->queue, req->bio);
 693 }
 694
 695 extern struct device_attribute dev_attr_ana_grpid;
 696 extern struct device_attribute dev_attr_ana_state;
 697 extern struct device_attribute subsys_attr_iopolicy;
 698
 699 #else
 700 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 701 {
 702         return false;
 703 }
 704 /*
 705  * Without the multipath code enabled, multiple controller per subsystems are
 706  * visible as devices and thus we cannot use the subsystem instance.
 707  */
 708 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 709                                       struct nvme_ctrl *ctrl, int *flags)
 710 {
 711         sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 712 }
 713
 714 static inline void nvme_failover_req(struct request *req)
 715 {
 716 }
 717 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 718 {
 719 }
 720 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 721                 struct nvme_ns_head *head)
 722 {
 723         return 0;
 724 }
 725 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 726                 struct nvme_id_ns *id)
 727 {
 728 }
 729 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 730 {
 731 }
 732 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 733 {
 734         return false;
 735 }
 736 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 737 {
 738 }
 739 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 740 {
 741 }
 742 static inline void nvme_trace_bio_complete(struct request *req)
 743 {
 744 }
 745 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
 746                 struct nvme_id_ctrl *id)
 747 {
 748         if (ctrl->subsys->cmic & (1 << 3))
 749                 dev_warn(ctrl->device,
 750 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 751         return 0;
 752 }
 753 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 754 {
 755 }
 756 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 757 {
 758 }
 759 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 760 {
 761 }
 762 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 763 {
 764 }
 765 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 766 {
 767 }
 768 #endif /* CONFIG_NVME_MULTIPATH */
 769
 770 int nvme_revalidate_zones(struct nvme_ns *ns);
 771 #ifdef CONFIG_BLK_DEV_ZONED
 772 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf);
 773 int nvme_report_zones(struct gendisk *disk, sector_t sector,
 774                       unsigned int nr_zones, report_zones_cb cb, void *data);
 775
 776 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
 777                                        struct nvme_command *cmnd,
 778                                        enum nvme_zone_mgmt_action action);
 779 #else
 780 #define nvme_report_zones NULL
 781
 782 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
 783                 struct request *req, struct nvme_command *cmnd,
 784                 enum nvme_zone_mgmt_action action)
 785 {
 786         return BLK_STS_NOTSUPP;
 787 }
 788
 789 static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
 790 {
 791         dev_warn(ns->ctrl->device,
 792                  "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n");
 793         return -EPROTONOSUPPORT;
 794 }
 795 #endif
 796
 797 #ifdef CONFIG_NVM
 798 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 799 void nvme_nvm_unregister(struct nvme_ns *ns);
 800 extern const struct attribute_group nvme_nvm_attr_group;
 801 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 802 #else
 803 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 804                                     int node)
 805 {
 806         return 0;
 807 }
 808
 809 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 810 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 811                                                         unsigned long arg)
 812 {
 813         return -ENOTTY;
 814 }
 815 #endif /* CONFIG_NVM */
 816
 817 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 818 {
 819         return dev_to_disk(dev)->private_data;
 820 }
 821
 822 #ifdef CONFIG_NVME_HWMON
 823 int nvme_hwmon_init(struct nvme_ctrl *ctrl);
 824 void nvme_hwmon_exit(struct nvme_ctrl *ctrl);
 825 #else
 826 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 827 {
 828         return 0;
 829 }
 830
 831 static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
 832 {
 833 }
 834 #endif
 835
 836 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 837                          u8 opcode);
 838 void nvme_execute_passthru_rq(struct request *rq);
 839 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
 840 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
 841 void nvme_put_ns(struct nvme_ns *ns);
 842
 843 #endif /* _NVME_H */