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
  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 NVME_ADMIN_TIMEOUT      (admin_timeout * HZ)
  27
  28 #define NVME_DEFAULT_KATO       5
  29
  30 #ifdef CONFIG_ARCH_NO_SG_CHAIN
  31 #define  NVME_INLINE_SG_CNT  0
  32 #define  NVME_INLINE_METADATA_SG_CNT  0
  33 #else
  34 #define  NVME_INLINE_SG_CNT  2
  35 #define  NVME_INLINE_METADATA_SG_CNT  1
  36 #endif
  37
  38 /*
  39  * Default to a 4K page size, with the intention to update this
  40  * path in the future to accommodate architectures with differing
  41  * kernel and IO page sizes.
  42  */
  43 #define NVME_CTRL_PAGE_SHIFT    12
  44 #define NVME_CTRL_PAGE_SIZE     (1 << NVME_CTRL_PAGE_SHIFT)
  45
  46 extern struct workqueue_struct *nvme_wq;
  47 extern struct workqueue_struct *nvme_reset_wq;
  48 extern struct workqueue_struct *nvme_delete_wq;
  49
  50 /*
  51  * List of workarounds for devices that required behavior not specified in
  52  * the standard.
  53  */
  54 enum nvme_quirks {
  55         /*
  56          * Prefers I/O aligned to a stripe size specified in a vendor
  57          * specific Identify field.
  58          */
  59         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  60
  61         /*
  62          * The controller doesn't handle Identify value others than 0 or 1
  63          * correctly.
  64          */
  65         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  66
  67         /*
  68          * The controller deterministically returns O's on reads to
  69          * logical blocks that deallocate was called on.
  70          */
  71         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  72
  73         /*
  74          * The controller needs a delay before starts checking the device
  75          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  76          */
  77         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  78
  79         /*
  80          * APST should not be used.
  81          */
  82         NVME_QUIRK_NO_APST                      = (1 << 4),
  83
  84         /*
  85          * The deepest sleep state should not be used.
  86          */
  87         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  88
  89         /*
  90          * Set MEDIUM priority on SQ creation
  91          */
  92         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
  93
  94         /*
  95          * Ignore device provided subnqn.
  96          */
  97         NVME_QUIRK_IGNORE_DEV_SUBNQN            = (1 << 8),
  98
  99         /*
 100          * Broken Write Zeroes.
 101          */
 102         NVME_QUIRK_DISABLE_WRITE_ZEROES         = (1 << 9),
 103
 104         /*
 105          * Force simple suspend/resume path.
 106          */
 107         NVME_QUIRK_SIMPLE_SUSPEND               = (1 << 10),
 108
 109         /*
 110          * Use only one interrupt vector for all queues
 111          */
 112         NVME_QUIRK_SINGLE_VECTOR                = (1 << 11),
 113
 114         /*
 115          * Use non-standard 128 bytes SQEs.
 116          */
 117         NVME_QUIRK_128_BYTES_SQES               = (1 << 12),
 118
 119         /*
 120          * Prevent tag overlap between queues
 121          */
 122         NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
 123
 124         /*
 125          * Don't change the value of the temperature threshold feature
 126          */
 127         NVME_QUIRK_NO_TEMP_THRESH_CHANGE        = (1 << 14),
 128
 129         /*
 130          * The controller doesn't handle the Identify Namespace
 131          * Identification Descriptor list subcommand despite claiming
 132          * NVMe 1.3 compliance.
 133          */
 134         NVME_QUIRK_NO_NS_DESC_LIST              = (1 << 15),
 135
 136         /*
 137          * The controller does not properly handle DMA addresses over
 138          * 48 bits.
 139          */
 140         NVME_QUIRK_DMA_ADDRESS_BITS_48          = (1 << 16),
 141
 142         /*
 143          * The controller requires the command_id value be be limited, so skip
 144          * encoding the generation sequence number.
 145          */
 146         NVME_QUIRK_SKIP_CID_GEN                 = (1 << 17),
 147 };
 148
 149 /*
 150  * Common request structure for NVMe passthrough.  All drivers must have
 151  * this structure as the first member of their request-private data.
 152  */
 153 struct nvme_request {
 154         struct nvme_command     *cmd;
 155         union nvme_result       result;
 156         u8                      genctr;
 157         u8                      retries;
 158         u8                      flags;
 159         u16                     status;
 160         struct nvme_ctrl        *ctrl;
 161 };
 162
 163 /*
 164  * Mark a bio as coming in through the mpath node.
 165  */
 166 #define REQ_NVME_MPATH          REQ_DRV
 167
 168 enum {
 169         NVME_REQ_CANCELLED              = (1 << 0),
 170         NVME_REQ_USERCMD                = (1 << 1),
 171 };
 172
 173 static inline struct nvme_request *nvme_req(struct request *req)
 174 {
 175         return blk_mq_rq_to_pdu(req);
 176 }
 177
 178 static inline u16 nvme_req_qid(struct request *req)
 179 {
 180         if (!req->q->queuedata)
 181                 return 0;
 182
 183         return req->mq_hctx->queue_num + 1;
 184 }
 185
 186 /* The below value is the specific amount of delay needed before checking
 187  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 188  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 189  * found empirically.
 190  */
 191 #define NVME_QUIRK_DELAY_AMOUNT         2300
 192
 193 /*
 194  * enum nvme_ctrl_state: Controller state
 195  *
 196  * @NVME_CTRL_NEW:              New controller just allocated, initial state
 197  * @NVME_CTRL_LIVE:             Controller is connected and I/O capable
 198  * @NVME_CTRL_RESETTING:        Controller is resetting (or scheduled reset)
 199  * @NVME_CTRL_CONNECTING:       Controller is disconnected, now connecting the
 200  *                              transport
 201  * @NVME_CTRL_DELETING:         Controller is deleting (or scheduled deletion)
 202  * @NVME_CTRL_DELETING_NOIO:    Controller is deleting and I/O is not
 203  *                              disabled/failed immediately. This state comes
 204  *                              after all async event processing took place and
 205  *                              before ns removal and the controller deletion
 206  *                              progress
 207  * @NVME_CTRL_DEAD:             Controller is non-present/unresponsive during
 208  *                              shutdown or removal. In this case we forcibly
 209  *                              kill all inflight I/O as they have no chance to
 210  *                              complete
 211  */
 212 enum nvme_ctrl_state {
 213         NVME_CTRL_NEW,
 214         NVME_CTRL_LIVE,
 215         NVME_CTRL_RESETTING,
 216         NVME_CTRL_CONNECTING,
 217         NVME_CTRL_DELETING,
 218         NVME_CTRL_DELETING_NOIO,
 219         NVME_CTRL_DEAD,
 220 };
 221
 222 struct nvme_fault_inject {
 223 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 224         struct fault_attr attr;
 225         struct dentry *parent;
 226         bool dont_retry;        /* DNR, do not retry */
 227         u16 status;             /* status code */
 228 #endif
 229 };
 230
 231 struct nvme_ctrl {
 232         bool comp_seen;
 233         enum nvme_ctrl_state state;
 234         bool identified;
 235         spinlock_t lock;
 236         struct mutex scan_lock;
 237         const struct nvme_ctrl_ops *ops;
 238         struct request_queue *admin_q;
 239         struct request_queue *connect_q;
 240         struct request_queue *fabrics_q;
 241         struct device *dev;
 242         int instance;
 243         int numa_node;
 244         struct blk_mq_tag_set *tagset;
 245         struct blk_mq_tag_set *admin_tagset;
 246         struct list_head namespaces;
 247         struct rw_semaphore namespaces_rwsem;
 248         struct device ctrl_device;
 249         struct device *device;  /* char device */
 250 #ifdef CONFIG_NVME_HWMON
 251         struct device *hwmon_device;
 252 #endif
 253         struct cdev cdev;
 254         struct work_struct reset_work;
 255         struct work_struct delete_work;
 256         wait_queue_head_t state_wq;
 257
 258         struct nvme_subsystem *subsys;
 259         struct list_head subsys_entry;
 260
 261         struct opal_dev *opal_dev;
 262
 263         char name[12];
 264         u16 cntlid;
 265
 266         u32 ctrl_config;
 267         u16 mtfa;
 268         u32 queue_count;
 269
 270         u64 cap;
 271         u32 max_hw_sectors;
 272         u32 max_segments;
 273         u32 max_integrity_segments;
 274         u32 max_discard_sectors;
 275         u32 max_discard_segments;
 276         u32 max_zeroes_sectors;
 277 #ifdef CONFIG_BLK_DEV_ZONED
 278         u32 max_zone_append;
 279 #endif
 280         u16 crdt[3];
 281         u16 oncs;
 282         u16 oacs;
 283         u16 nssa;
 284         u16 nr_streams;
 285         u16 sqsize;
 286         u32 max_namespaces;
 287         atomic_t abort_limit;
 288         u8 vwc;
 289         u32 vs;
 290         u32 sgls;
 291         u16 kas;
 292         u8 npss;
 293         u8 apsta;
 294         u16 wctemp;
 295         u16 cctemp;
 296         u32 oaes;
 297         u32 aen_result;
 298         u32 ctratt;
 299         unsigned int shutdown_timeout;
 300         unsigned int kato;
 301         bool subsystem;
 302         unsigned long quirks;
 303         struct nvme_id_power_state psd[32];
 304         struct nvme_effects_log *effects;
 305         struct xarray cels;
 306         struct work_struct scan_work;
 307         struct work_struct async_event_work;
 308         struct delayed_work ka_work;
 309         struct delayed_work failfast_work;
 310         struct nvme_command ka_cmd;
 311         struct work_struct fw_act_work;
 312         unsigned long events;
 313
 314 #ifdef CONFIG_NVME_MULTIPATH
 315         /* asymmetric namespace access: */
 316         u8 anacap;
 317         u8 anatt;
 318         u32 anagrpmax;
 319         u32 nanagrpid;
 320         struct mutex ana_lock;
 321         struct nvme_ana_rsp_hdr *ana_log_buf;
 322         size_t ana_log_size;
 323         struct timer_list anatt_timer;
 324         struct work_struct ana_work;
 325 #endif
 326
 327         /* Power saving configuration */
 328         u64 ps_max_latency_us;
 329         bool apst_enabled;
 330
 331         /* PCIe only: */
 332         u32 hmpre;
 333         u32 hmmin;
 334         u32 hmminds;
 335         u16 hmmaxd;
 336
 337         /* Fabrics only */
 338         u32 ioccsz;
 339         u32 iorcsz;
 340         u16 icdoff;
 341         u16 maxcmd;
 342         int nr_reconnects;
 343         unsigned long flags;
 344 #define NVME_CTRL_FAILFAST_EXPIRED      0
 345 #define NVME_CTRL_ADMIN_Q_STOPPED       1
 346         struct nvmf_ctrl_options *opts;
 347
 348         struct page *discard_page;
 349         unsigned long discard_page_busy;
 350
 351         struct nvme_fault_inject fault_inject;
 352 };
 353
 354 enum nvme_iopolicy {
 355         NVME_IOPOLICY_NUMA,
 356         NVME_IOPOLICY_RR,
 357 };
 358
 359 struct nvme_subsystem {
 360         int                     instance;
 361         struct device           dev;
 362         /*
 363          * Because we unregister the device on the last put we need
 364          * a separate refcount.
 365          */
 366         struct kref             ref;
 367         struct list_head        entry;
 368         struct mutex            lock;
 369         struct list_head        ctrls;
 370         struct list_head        nsheads;
 371         char                    subnqn[NVMF_NQN_SIZE];
 372         char                    serial[20];
 373         char                    model[40];
 374         char                    firmware_rev[8];
 375         u8                      cmic;
 376         enum nvme_subsys_type   subtype;
 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
 414         struct cdev             cdev;
 415         struct device           cdev_device;
 416
 417         struct gendisk          *disk;
 418 #ifdef CONFIG_NVME_MULTIPATH
 419         struct bio_list         requeue_list;
 420         spinlock_t              requeue_lock;
 421         struct work_struct      requeue_work;
 422         struct mutex            lock;
 423         unsigned long           flags;
 424 #define NVME_NSHEAD_DISK_LIVE   0
 425         struct nvme_ns __rcu    *current_path[];
 426 #endif
 427 };
 428
 429 static inline bool nvme_ns_head_multipath(struct nvme_ns_head *head)
 430 {
 431         return IS_ENABLED(CONFIG_NVME_MULTIPATH) && head->disk;
 432 }
 433
 434 enum nvme_ns_features {
 435         NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
 436         NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
 437 };
 438
 439 struct nvme_ns {
 440         struct list_head list;
 441
 442         struct nvme_ctrl *ctrl;
 443         struct request_queue *queue;
 444         struct gendisk *disk;
 445 #ifdef CONFIG_NVME_MULTIPATH
 446         enum nvme_ana_state ana_state;
 447         u32 ana_grpid;
 448 #endif
 449         struct list_head siblings;
 450         struct kref kref;
 451         struct nvme_ns_head *head;
 452
 453         int lba_shift;
 454         u16 ms;
 455         u16 sgs;
 456         u32 sws;
 457         u8 pi_type;
 458 #ifdef CONFIG_BLK_DEV_ZONED
 459         u64 zsze;
 460 #endif
 461         unsigned long features;
 462         unsigned long flags;
 463 #define NVME_NS_REMOVING        0
 464 #define NVME_NS_DEAD            1
 465 #define NVME_NS_ANA_PENDING     2
 466 #define NVME_NS_FORCE_RO        3
 467 #define NVME_NS_READY           4
 468 #define NVME_NS_STOPPED         5
 469
 470         struct cdev             cdev;
 471         struct device           cdev_device;
 472
 473         struct nvme_fault_inject fault_inject;
 474
 475 };
 476
 477 /* NVMe ns supports metadata actions by the controller (generate/strip) */
 478 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
 479 {
 480         return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
 481 }
 482
 483 struct nvme_ctrl_ops {
 484         const char *name;
 485         struct module *module;
 486         unsigned int flags;
 487 #define NVME_F_FABRICS                  (1 << 0)
 488 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 489 #define NVME_F_PCI_P2PDMA               (1 << 2)
 490         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 491         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 492         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 493         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 494         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 495         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 496         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 497 };
 498
 499 /*
 500  * nvme command_id is constructed as such:
 501  * | xxxx | xxxxxxxxxxxx |
 502  *   gen    request tag
 503  */
 504 #define nvme_genctr_mask(gen)                   (gen & 0xf)
 505 #define nvme_cid_install_genctr(gen)            (nvme_genctr_mask(gen) << 12)
 506 #define nvme_genctr_from_cid(cid)               ((cid & 0xf000) >> 12)
 507 #define nvme_tag_from_cid(cid)                  (cid & 0xfff)
 508
 509 static inline u16 nvme_cid(struct request *rq)
 510 {
 511         return nvme_cid_install_genctr(nvme_req(rq)->genctr) | rq->tag;
 512 }
 513
 514 static inline struct request *nvme_find_rq(struct blk_mq_tags *tags,
 515                 u16 command_id)
 516 {
 517         u8 genctr = nvme_genctr_from_cid(command_id);
 518         u16 tag = nvme_tag_from_cid(command_id);
 519         struct request *rq;
 520
 521         rq = blk_mq_tag_to_rq(tags, tag);
 522         if (unlikely(!rq)) {
 523                 pr_err("could not locate request for tag %#x\n",
 524                         tag);
 525                 return NULL;
 526         }
 527         if (unlikely(nvme_genctr_mask(nvme_req(rq)->genctr) != genctr)) {
 528                 dev_err(nvme_req(rq)->ctrl->device,
 529                         "request %#x genctr mismatch (got %#x expected %#x)\n",
 530                         tag, genctr, nvme_genctr_mask(nvme_req(rq)->genctr));
 531                 return NULL;
 532         }
 533         return rq;
 534 }
 535
 536 static inline struct request *nvme_cid_to_rq(struct blk_mq_tags *tags,
 537                 u16 command_id)
 538 {
 539         return blk_mq_tag_to_rq(tags, nvme_tag_from_cid(command_id));
 540 }
 541
 542 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 543 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 544                             const char *dev_name);
 545 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
 546 void nvme_should_fail(struct request *req);
 547 #else
 548 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 549                                           const char *dev_name)
 550 {
 551 }
 552 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
 553 {
 554 }
 555 static inline void nvme_should_fail(struct request *req) {}
 556 #endif
 557
 558 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 559 {
 560         if (!ctrl->subsystem)
 561                 return -ENOTTY;
 562         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 563 }
 564
 565 /*
 566  * Convert a 512B sector number to a device logical block number.
 567  */
 568 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
 569 {
 570         return sector >> (ns->lba_shift - SECTOR_SHIFT);
 571 }
 572
 573 /*
 574  * Convert a device logical block number to a 512B sector number.
 575  */
 576 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
 577 {
 578         return lba << (ns->lba_shift - SECTOR_SHIFT);
 579 }
 580
 581 /*
 582  * Convert byte length to nvme's 0-based num dwords
 583  */
 584 static inline u32 nvme_bytes_to_numd(size_t len)
 585 {
 586         return (len >> 2) - 1;
 587 }
 588
 589 static inline bool nvme_is_ana_error(u16 status)
 590 {
 591         switch (status & 0x7ff) {
 592         case NVME_SC_ANA_TRANSITION:
 593         case NVME_SC_ANA_INACCESSIBLE:
 594         case NVME_SC_ANA_PERSISTENT_LOSS:
 595                 return true;
 596         default:
 597                 return false;
 598         }
 599 }
 600
 601 static inline bool nvme_is_path_error(u16 status)
 602 {
 603         /* check for a status code type of 'path related status' */
 604         return (status & 0x700) == 0x300;
 605 }
 606
 607 /*
 608  * Fill in the status and result information from the CQE, and then figure out
 609  * if blk-mq will need to use IPI magic to complete the request, and if yes do
 610  * so.  If not let the caller complete the request without an indirect function
 611  * call.
 612  */
 613 static inline bool nvme_try_complete_req(struct request *req, __le16 status,
 614                 union nvme_result result)
 615 {
 616         struct nvme_request *rq = nvme_req(req);
 617         struct nvme_ctrl *ctrl = rq->ctrl;
 618
 619         if (!(ctrl->quirks & NVME_QUIRK_SKIP_CID_GEN))
 620                 rq->genctr++;
 621
 622         rq->status = le16_to_cpu(status) >> 1;
 623         rq->result = result;
 624         /* inject error when permitted by fault injection framework */
 625         nvme_should_fail(req);
 626         if (unlikely(blk_should_fake_timeout(req->q)))
 627                 return true;
 628         return blk_mq_complete_request_remote(req);
 629 }
 630
 631 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 632 {
 633         get_device(ctrl->device);
 634 }
 635
 636 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 637 {
 638         put_device(ctrl->device);
 639 }
 640
 641 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 642 {
 643         return !qid &&
 644                 nvme_tag_from_cid(command_id) >= NVME_AQ_BLK_MQ_DEPTH;
 645 }
 646
 647 void nvme_complete_rq(struct request *req);
 648 void nvme_complete_batch_req(struct request *req);
 649
 650 static __always_inline void nvme_complete_batch(struct io_comp_batch *iob,
 651                                                 void (*fn)(struct request *rq))
 652 {
 653         struct request *req;
 654
 655         rq_list_for_each(&iob->req_list, req) {
 656                 fn(req);
 657                 nvme_complete_batch_req(req);
 658         }
 659         blk_mq_end_request_batch(iob);
 660 }
 661
 662 blk_status_t nvme_host_path_error(struct request *req);
 663 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 664 void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
 665 void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
 666 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 667                 enum nvme_ctrl_state new_state);
 668 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
 669 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
 670 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 671 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 672 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 673                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 674 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 675 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 676 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 677 int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl);
 678
 679 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 680
 681 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 682                 bool send);
 683
 684 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 685                 volatile union nvme_result *res);
 686
 687 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 688 void nvme_start_queues(struct nvme_ctrl *ctrl);
 689 void nvme_stop_admin_queue(struct nvme_ctrl *ctrl);
 690 void nvme_start_admin_queue(struct nvme_ctrl *ctrl);
 691 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 692 void nvme_sync_queues(struct nvme_ctrl *ctrl);
 693 void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
 694 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 695 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 696 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 697 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 698
 699 #define NVME_QID_ANY -1
 700 struct request *nvme_alloc_request(struct request_queue *q,
 701                 struct nvme_command *cmd, blk_mq_req_flags_t flags);
 702 void nvme_cleanup_cmd(struct request *req);
 703 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req);
 704 blk_status_t nvme_fail_nonready_command(struct nvme_ctrl *ctrl,
 705                 struct request *req);
 706 bool __nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
 707                 bool queue_live);
 708
 709 static inline bool nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
 710                 bool queue_live)
 711 {
 712         if (likely(ctrl->state == NVME_CTRL_LIVE))
 713                 return true;
 714         if (ctrl->ops->flags & NVME_F_FABRICS &&
 715             ctrl->state == NVME_CTRL_DELETING)
 716                 return queue_live;
 717         return __nvme_check_ready(ctrl, rq, queue_live);
 718 }
 719 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 720                 void *buf, unsigned bufflen);
 721 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 722                 union nvme_result *result, void *buffer, unsigned bufflen,
 723                 unsigned timeout, int qid, int at_head,
 724                 blk_mq_req_flags_t flags);
 725 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 726                       unsigned int dword11, void *buffer, size_t buflen,
 727                       u32 *result);
 728 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 729                       unsigned int dword11, void *buffer, size_t buflen,
 730                       u32 *result);
 731 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 732 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 733 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 734 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 735 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
 736 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 737 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 738 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
 739                 void *log, size_t size, u64 offset);
 740 bool nvme_tryget_ns_head(struct nvme_ns_head *head);
 741 void nvme_put_ns_head(struct nvme_ns_head *head);
 742 int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device,
 743                 const struct file_operations *fops, struct module *owner);
 744 void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device);
 745 int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 746                 unsigned int cmd, unsigned long arg);
 747 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 748 int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
 749                 unsigned int cmd, unsigned long arg);
 750 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
 751                 unsigned long arg);
 752 long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 753                 unsigned long arg);
 754 int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 755
 756 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 757 extern const struct pr_ops nvme_pr_ops;
 758 extern const struct block_device_operations nvme_ns_head_ops;
 759
 760 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 761 #ifdef CONFIG_NVME_MULTIPATH
 762 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 763 {
 764         return ctrl->ana_log_buf != NULL;
 765 }
 766
 767 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 768 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 769 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 770 void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys);
 771 bool nvme_mpath_set_disk_name(struct nvme_ns *ns, char *disk_name, int *flags);
 772 void nvme_failover_req(struct request *req);
 773 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 774 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 775 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 776 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 777 int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 778 void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl);
 779 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 780 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 781 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
 782 void nvme_mpath_revalidate_paths(struct nvme_ns *ns);
 783 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 784 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head);
 785
 786 static inline void nvme_trace_bio_complete(struct request *req)
 787 {
 788         struct nvme_ns *ns = req->q->queuedata;
 789
 790         if (req->cmd_flags & REQ_NVME_MPATH)
 791                 trace_block_bio_complete(ns->head->disk->queue, req->bio);
 792 }
 793
 794 extern struct device_attribute dev_attr_ana_grpid;
 795 extern struct device_attribute dev_attr_ana_state;
 796 extern struct device_attribute subsys_attr_iopolicy;
 797
 798 #else
 799 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 800 {
 801         return false;
 802 }
 803 static inline bool nvme_mpath_set_disk_name(struct nvme_ns *ns, char *disk_name,
 804                 int *flags)
 805 {
 806         return false;
 807 }
 808 static inline void nvme_failover_req(struct request *req)
 809 {
 810 }
 811 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 812 {
 813 }
 814 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 815                 struct nvme_ns_head *head)
 816 {
 817         return 0;
 818 }
 819 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 820                 struct nvme_id_ns *id)
 821 {
 822 }
 823 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 824 {
 825 }
 826 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 827 {
 828         return false;
 829 }
 830 static inline void nvme_mpath_revalidate_paths(struct nvme_ns *ns)
 831 {
 832 }
 833 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 834 {
 835 }
 836 static inline void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)
 837 {
 838 }
 839 static inline void nvme_trace_bio_complete(struct request *req)
 840 {
 841 }
 842 static inline void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)
 843 {
 844 }
 845 static inline int nvme_mpath_init_identify(struct nvme_ctrl *ctrl,
 846                 struct nvme_id_ctrl *id)
 847 {
 848         if (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)
 849                 dev_warn(ctrl->device,
 850 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 851         return 0;
 852 }
 853 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 854 {
 855 }
 856 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 857 {
 858 }
 859 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 860 {
 861 }
 862 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 863 {
 864 }
 865 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 866 {
 867 }
 868 static inline void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
 869 {
 870 }
 871 #endif /* CONFIG_NVME_MULTIPATH */
 872
 873 int nvme_revalidate_zones(struct nvme_ns *ns);
 874 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
 875                 unsigned int nr_zones, report_zones_cb cb, void *data);
 876 #ifdef CONFIG_BLK_DEV_ZONED
 877 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf);
 878 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
 879                                        struct nvme_command *cmnd,
 880                                        enum nvme_zone_mgmt_action action);
 881 #else
 882 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
 883                 struct request *req, struct nvme_command *cmnd,
 884                 enum nvme_zone_mgmt_action action)
 885 {
 886         return BLK_STS_NOTSUPP;
 887 }
 888
 889 static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
 890 {
 891         dev_warn(ns->ctrl->device,
 892                  "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n");
 893         return -EPROTONOSUPPORT;
 894 }
 895 #endif
 896
 897 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 898 {
 899         return dev_to_disk(dev)->private_data;
 900 }
 901
 902 #ifdef CONFIG_NVME_HWMON
 903 int nvme_hwmon_init(struct nvme_ctrl *ctrl);
 904 void nvme_hwmon_exit(struct nvme_ctrl *ctrl);
 905 #else
 906 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 907 {
 908         return 0;
 909 }
 910
 911 static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
 912 {
 913 }
 914 #endif
 915
 916 static inline bool nvme_ctrl_sgl_supported(struct nvme_ctrl *ctrl)
 917 {
 918         return ctrl->sgls & ((1 << 0) | (1 << 1));
 919 }
 920
 921 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 922                          u8 opcode);
 923 int nvme_execute_passthru_rq(struct request *rq);
 924 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
 925 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
 926 void nvme_put_ns(struct nvme_ns *ns);
 927
 928 static inline bool nvme_multi_css(struct nvme_ctrl *ctrl)
 929 {
 930         return (ctrl->ctrl_config & NVME_CC_CSS_MASK) == NVME_CC_CSS_CSI;
 931 }
 932
 933 #endif /* _NVME_H */