1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2011-2014, Intel Corporation. 4 */ 5 6 #ifndef _NVME_H 7 #define _NVME_H 8 9 #include <linux/nvme.h> 10 #include <linux/cdev.h> 11 #include <linux/pci.h> 12 #include <linux/kref.h> 13 #include <linux/blk-mq.h> 14 #include <linux/lightnvm.h> 15 #include <linux/sed-opal.h> 16 #include <linux/fault-inject.h> 17 #include <linux/rcupdate.h> 18 #include <linux/wait.h> 19 #include <linux/t10-pi.h> 20 21 #include <trace/events/block.h> 22 23 extern unsigned int nvme_io_timeout; 24 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) 25 26 extern unsigned int admin_timeout; 27 #define ADMIN_TIMEOUT (admin_timeout * HZ) 28 29 #define NVME_DEFAULT_KATO 5 30 #define NVME_KATO_GRACE 10 31 32 #ifdef CONFIG_ARCH_NO_SG_CHAIN 33 #define NVME_INLINE_SG_CNT 0 34 #define NVME_INLINE_METADATA_SG_CNT 0 35 #else 36 #define NVME_INLINE_SG_CNT 2 37 #define NVME_INLINE_METADATA_SG_CNT 1 38 #endif 39 40 /* 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 /* 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 retries; 157 u8 flags; 158 u16 status; 159 struct nvme_ctrl *ctrl; 160 }; 161 162 /* 163 * Mark a bio as coming in through the mpath node. 164 */ 165 #define REQ_NVME_MPATH REQ_DRV 166 167 enum { 168 NVME_REQ_CANCELLED = (1 << 0), 169 NVME_REQ_USERCMD = (1 << 1), 170 }; 171 172 static inline struct nvme_request *nvme_req(struct request *req) 173 { 174 return blk_mq_rq_to_pdu(req); 175 } 176 177 static inline u16 nvme_req_qid(struct request *req) 178 { 179 if (!req->q->queuedata) 180 return 0; 181 return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1; 182 } 183 184 /* The below value is the specific amount of delay needed before checking 185 * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the 186 * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was 187 * found empirically. 188 */ 189 #define NVME_QUIRK_DELAY_AMOUNT 2300 190 191 /* 192 * enum nvme_ctrl_state: Controller state 193 * 194 * @NVME_CTRL_NEW: New controller just allocated, initial state 195 * @NVME_CTRL_LIVE: Controller is connected and I/O capable 196 * @NVME_CTRL_RESETTING: Controller is resetting (or scheduled reset) 197 * @NVME_CTRL_CONNECTING: Controller is disconnected, now connecting the 198 * transport 199 * @NVME_CTRL_DELETING: Controller is deleting (or scheduled deletion) 200 * @NVME_CTRL_DELETING_NOIO: Controller is deleting and I/O is not 201 * disabled/failed immediately. This state comes 202 * after all async event processing took place and 203 * before ns removal and the controller deletion 204 * progress 205 * @NVME_CTRL_DEAD: Controller is non-present/unresponsive during 206 * shutdown or removal. In this case we forcibly 207 * kill all inflight I/O as they have no chance to 208 * complete 209 */ 210 enum nvme_ctrl_state { 211 NVME_CTRL_NEW, 212 NVME_CTRL_LIVE, 213 NVME_CTRL_RESETTING, 214 NVME_CTRL_CONNECTING, 215 NVME_CTRL_DELETING, 216 NVME_CTRL_DELETING_NOIO, 217 NVME_CTRL_DEAD, 218 }; 219 220 struct nvme_fault_inject { 221 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 222 struct fault_attr attr; 223 struct dentry *parent; 224 bool dont_retry; /* DNR, do not retry */ 225 u16 status; /* status code */ 226 #endif 227 }; 228 229 struct nvme_ctrl { 230 bool comp_seen; 231 enum nvme_ctrl_state state; 232 bool identified; 233 spinlock_t lock; 234 struct mutex scan_lock; 235 const struct nvme_ctrl_ops *ops; 236 struct request_queue *admin_q; 237 struct request_queue *connect_q; 238 struct request_queue *fabrics_q; 239 struct device *dev; 240 int instance; 241 int numa_node; 242 struct blk_mq_tag_set *tagset; 243 struct blk_mq_tag_set *admin_tagset; 244 struct list_head namespaces; 245 struct rw_semaphore namespaces_rwsem; 246 struct device ctrl_device; 247 struct device *device; /* char device */ 248 struct cdev cdev; 249 struct work_struct reset_work; 250 struct work_struct delete_work; 251 wait_queue_head_t state_wq; 252 253 struct nvme_subsystem *subsys; 254 struct list_head subsys_entry; 255 256 struct opal_dev *opal_dev; 257 258 char name[12]; 259 u16 cntlid; 260 261 u32 ctrl_config; 262 u16 mtfa; 263 u32 queue_count; 264 265 u64 cap; 266 u32 max_hw_sectors; 267 u32 max_segments; 268 u32 max_integrity_segments; 269 #ifdef CONFIG_BLK_DEV_ZONED 270 u32 max_zone_append; 271 #endif 272 u16 crdt[3]; 273 u16 oncs; 274 u16 oacs; 275 u16 nssa; 276 u16 nr_streams; 277 u16 sqsize; 278 u32 max_namespaces; 279 atomic_t abort_limit; 280 u8 vwc; 281 u32 vs; 282 u32 sgls; 283 u16 kas; 284 u8 npss; 285 u8 apsta; 286 u16 wctemp; 287 u16 cctemp; 288 u32 oaes; 289 u32 aen_result; 290 u32 ctratt; 291 unsigned int shutdown_timeout; 292 unsigned int kato; 293 bool subsystem; 294 unsigned long quirks; 295 struct nvme_id_power_state psd[32]; 296 struct nvme_effects_log *effects; 297 struct xarray cels; 298 struct work_struct scan_work; 299 struct work_struct async_event_work; 300 struct delayed_work ka_work; 301 struct nvme_command ka_cmd; 302 struct work_struct fw_act_work; 303 unsigned long events; 304 305 #ifdef CONFIG_NVME_MULTIPATH 306 /* asymmetric namespace access: */ 307 u8 anacap; 308 u8 anatt; 309 u32 anagrpmax; 310 u32 nanagrpid; 311 struct mutex ana_lock; 312 struct nvme_ana_rsp_hdr *ana_log_buf; 313 size_t ana_log_size; 314 struct timer_list anatt_timer; 315 struct work_struct ana_work; 316 #endif 317 318 /* Power saving configuration */ 319 u64 ps_max_latency_us; 320 bool apst_enabled; 321 322 /* PCIe only: */ 323 u32 hmpre; 324 u32 hmmin; 325 u32 hmminds; 326 u16 hmmaxd; 327 328 /* Fabrics only */ 329 u32 ioccsz; 330 u32 iorcsz; 331 u16 icdoff; 332 u16 maxcmd; 333 int nr_reconnects; 334 struct nvmf_ctrl_options *opts; 335 336 struct page *discard_page; 337 unsigned long discard_page_busy; 338 339 struct nvme_fault_inject fault_inject; 340 }; 341 342 enum nvme_iopolicy { 343 NVME_IOPOLICY_NUMA, 344 NVME_IOPOLICY_RR, 345 }; 346 347 struct nvme_subsystem { 348 int instance; 349 struct device dev; 350 /* 351 * Because we unregister the device on the last put we need 352 * a separate refcount. 353 */ 354 struct kref ref; 355 struct list_head entry; 356 struct mutex lock; 357 struct list_head ctrls; 358 struct list_head nsheads; 359 char subnqn[NVMF_NQN_SIZE]; 360 char serial[20]; 361 char model[40]; 362 char firmware_rev[8]; 363 u8 cmic; 364 u16 vendor_id; 365 u16 awupf; /* 0's based awupf value. */ 366 struct ida ns_ida; 367 #ifdef CONFIG_NVME_MULTIPATH 368 enum nvme_iopolicy iopolicy; 369 #endif 370 }; 371 372 /* 373 * Container structure for uniqueue namespace identifiers. 374 */ 375 struct nvme_ns_ids { 376 u8 eui64[8]; 377 u8 nguid[16]; 378 uuid_t uuid; 379 u8 csi; 380 }; 381 382 /* 383 * Anchor structure for namespaces. There is one for each namespace in a 384 * NVMe subsystem that any of our controllers can see, and the namespace 385 * structure for each controller is chained of it. For private namespaces 386 * there is a 1:1 relation to our namespace structures, that is ->list 387 * only ever has a single entry for private namespaces. 388 */ 389 struct nvme_ns_head { 390 struct list_head list; 391 struct srcu_struct srcu; 392 struct nvme_subsystem *subsys; 393 unsigned ns_id; 394 struct nvme_ns_ids ids; 395 struct list_head entry; 396 struct kref ref; 397 bool shared; 398 int instance; 399 struct nvme_effects_log *effects; 400 #ifdef CONFIG_NVME_MULTIPATH 401 struct gendisk *disk; 402 struct bio_list requeue_list; 403 spinlock_t requeue_lock; 404 struct work_struct requeue_work; 405 struct mutex lock; 406 unsigned long flags; 407 #define NVME_NSHEAD_DISK_LIVE 0 408 struct nvme_ns __rcu *current_path[]; 409 #endif 410 }; 411 412 enum nvme_ns_features { 413 NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */ 414 NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */ 415 }; 416 417 struct nvme_ns { 418 struct list_head list; 419 420 struct nvme_ctrl *ctrl; 421 struct request_queue *queue; 422 struct gendisk *disk; 423 #ifdef CONFIG_NVME_MULTIPATH 424 enum nvme_ana_state ana_state; 425 u32 ana_grpid; 426 #endif 427 struct list_head siblings; 428 struct nvm_dev *ndev; 429 struct kref kref; 430 struct nvme_ns_head *head; 431 432 int lba_shift; 433 u16 ms; 434 u16 sgs; 435 u32 sws; 436 u8 pi_type; 437 #ifdef CONFIG_BLK_DEV_ZONED 438 u64 zsze; 439 #endif 440 unsigned long features; 441 unsigned long flags; 442 #define NVME_NS_REMOVING 0 443 #define NVME_NS_DEAD 1 444 #define NVME_NS_ANA_PENDING 2 445 446 struct nvme_fault_inject fault_inject; 447 448 }; 449 450 /* NVMe ns supports metadata actions by the controller (generate/strip) */ 451 static inline bool nvme_ns_has_pi(struct nvme_ns *ns) 452 { 453 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple); 454 } 455 456 struct nvme_ctrl_ops { 457 const char *name; 458 struct module *module; 459 unsigned int flags; 460 #define NVME_F_FABRICS (1 << 0) 461 #define NVME_F_METADATA_SUPPORTED (1 << 1) 462 #define NVME_F_PCI_P2PDMA (1 << 2) 463 int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val); 464 int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); 465 int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); 466 void (*free_ctrl)(struct nvme_ctrl *ctrl); 467 void (*submit_async_event)(struct nvme_ctrl *ctrl); 468 void (*delete_ctrl)(struct nvme_ctrl *ctrl); 469 int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); 470 }; 471 472 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 473 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj, 474 const char *dev_name); 475 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject); 476 void nvme_should_fail(struct request *req); 477 #else 478 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj, 479 const char *dev_name) 480 { 481 } 482 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj) 483 { 484 } 485 static inline void nvme_should_fail(struct request *req) {} 486 #endif 487 488 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl) 489 { 490 if (!ctrl->subsystem) 491 return -ENOTTY; 492 return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65); 493 } 494 495 /* 496 * Convert a 512B sector number to a device logical block number. 497 */ 498 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector) 499 { 500 return sector >> (ns->lba_shift - SECTOR_SHIFT); 501 } 502 503 /* 504 * Convert a device logical block number to a 512B sector number. 505 */ 506 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba) 507 { 508 return lba << (ns->lba_shift - SECTOR_SHIFT); 509 } 510 511 /* 512 * Convert byte length to nvme's 0-based num dwords 513 */ 514 static inline u32 nvme_bytes_to_numd(size_t len) 515 { 516 return (len >> 2) - 1; 517 } 518 519 static inline bool nvme_is_ana_error(u16 status) 520 { 521 switch (status & 0x7ff) { 522 case NVME_SC_ANA_TRANSITION: 523 case NVME_SC_ANA_INACCESSIBLE: 524 case NVME_SC_ANA_PERSISTENT_LOSS: 525 return true; 526 default: 527 return false; 528 } 529 } 530 531 static inline bool nvme_is_path_error(u16 status) 532 { 533 /* check for a status code type of 'path related status' */ 534 return (status & 0x700) == 0x300; 535 } 536 537 /* 538 * Fill in the status and result information from the CQE, and then figure out 539 * if blk-mq will need to use IPI magic to complete the request, and if yes do 540 * so. If not let the caller complete the request without an indirect function 541 * call. 542 */ 543 static inline bool nvme_try_complete_req(struct request *req, __le16 status, 544 union nvme_result result) 545 { 546 struct nvme_request *rq = nvme_req(req); 547 548 rq->status = le16_to_cpu(status) >> 1; 549 rq->result = result; 550 /* inject error when permitted by fault injection framework */ 551 nvme_should_fail(req); 552 if (unlikely(blk_should_fake_timeout(req->q))) 553 return true; 554 return blk_mq_complete_request_remote(req); 555 } 556 557 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl) 558 { 559 get_device(ctrl->device); 560 } 561 562 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl) 563 { 564 put_device(ctrl->device); 565 } 566 567 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id) 568 { 569 return !qid && command_id >= NVME_AQ_BLK_MQ_DEPTH; 570 } 571 572 void nvme_complete_rq(struct request *req); 573 bool nvme_cancel_request(struct request *req, void *data, bool reserved); 574 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, 575 enum nvme_ctrl_state new_state); 576 bool nvme_wait_reset(struct nvme_ctrl *ctrl); 577 int nvme_disable_ctrl(struct nvme_ctrl *ctrl); 578 int nvme_enable_ctrl(struct nvme_ctrl *ctrl); 579 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl); 580 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, 581 const struct nvme_ctrl_ops *ops, unsigned long quirks); 582 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl); 583 void nvme_start_ctrl(struct nvme_ctrl *ctrl); 584 void nvme_stop_ctrl(struct nvme_ctrl *ctrl); 585 int nvme_init_identify(struct nvme_ctrl *ctrl); 586 587 void nvme_remove_namespaces(struct nvme_ctrl *ctrl); 588 589 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, 590 bool send); 591 592 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, 593 volatile union nvme_result *res); 594 595 void nvme_stop_queues(struct nvme_ctrl *ctrl); 596 void nvme_start_queues(struct nvme_ctrl *ctrl); 597 void nvme_kill_queues(struct nvme_ctrl *ctrl); 598 void nvme_sync_queues(struct nvme_ctrl *ctrl); 599 void nvme_sync_io_queues(struct nvme_ctrl *ctrl); 600 void nvme_unfreeze(struct nvme_ctrl *ctrl); 601 void nvme_wait_freeze(struct nvme_ctrl *ctrl); 602 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout); 603 void nvme_start_freeze(struct nvme_ctrl *ctrl); 604 605 #define NVME_QID_ANY -1 606 struct request *nvme_alloc_request(struct request_queue *q, 607 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid); 608 void nvme_cleanup_cmd(struct request *req); 609 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, 610 struct nvme_command *cmd); 611 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 612 void *buf, unsigned bufflen); 613 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 614 union nvme_result *result, void *buffer, unsigned bufflen, 615 unsigned timeout, int qid, int at_head, 616 blk_mq_req_flags_t flags, bool poll); 617 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid, 618 unsigned int dword11, void *buffer, size_t buflen, 619 u32 *result); 620 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid, 621 unsigned int dword11, void *buffer, size_t buflen, 622 u32 *result); 623 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count); 624 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl); 625 int nvme_reset_ctrl(struct nvme_ctrl *ctrl); 626 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl); 627 int nvme_try_sched_reset(struct nvme_ctrl *ctrl); 628 int nvme_delete_ctrl(struct nvme_ctrl *ctrl); 629 630 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi, 631 void *log, size_t size, u64 offset); 632 struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, 633 struct nvme_ns_head **head, int *srcu_idx); 634 void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx); 635 636 extern const struct attribute_group *nvme_ns_id_attr_groups[]; 637 extern const struct block_device_operations nvme_ns_head_ops; 638 639 #ifdef CONFIG_NVME_MULTIPATH 640 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl) 641 { 642 return ctrl->ana_log_buf != NULL; 643 } 644 645 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys); 646 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys); 647 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys); 648 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, 649 struct nvme_ctrl *ctrl, int *flags); 650 void nvme_failover_req(struct request *req); 651 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl); 652 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head); 653 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id); 654 void nvme_mpath_remove_disk(struct nvme_ns_head *head); 655 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id); 656 void nvme_mpath_uninit(struct nvme_ctrl *ctrl); 657 void nvme_mpath_stop(struct nvme_ctrl *ctrl); 658 bool nvme_mpath_clear_current_path(struct nvme_ns *ns); 659 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl); 660 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head); 661 blk_qc_t nvme_ns_head_submit_bio(struct bio *bio); 662 663 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) 664 { 665 struct nvme_ns_head *head = ns->head; 666 667 if (head->disk && list_empty(&head->list)) 668 kblockd_schedule_work(&head->requeue_work); 669 } 670 671 static inline void nvme_trace_bio_complete(struct request *req, 672 blk_status_t status) 673 { 674 struct nvme_ns *ns = req->q->queuedata; 675 676 if (req->cmd_flags & REQ_NVME_MPATH) 677 trace_block_bio_complete(ns->head->disk->queue, req->bio); 678 } 679 680 extern struct device_attribute dev_attr_ana_grpid; 681 extern struct device_attribute dev_attr_ana_state; 682 extern struct device_attribute subsys_attr_iopolicy; 683 684 #else 685 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl) 686 { 687 return false; 688 } 689 /* 690 * Without the multipath code enabled, multiple controller per subsystems are 691 * visible as devices and thus we cannot use the subsystem instance. 692 */ 693 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, 694 struct nvme_ctrl *ctrl, int *flags) 695 { 696 sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); 697 } 698 699 static inline void nvme_failover_req(struct request *req) 700 { 701 } 702 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) 703 { 704 } 705 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, 706 struct nvme_ns_head *head) 707 { 708 return 0; 709 } 710 static inline void nvme_mpath_add_disk(struct nvme_ns *ns, 711 struct nvme_id_ns *id) 712 { 713 } 714 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head) 715 { 716 } 717 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns) 718 { 719 return false; 720 } 721 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl) 722 { 723 } 724 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) 725 { 726 } 727 static inline void nvme_trace_bio_complete(struct request *req, 728 blk_status_t status) 729 { 730 } 731 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl, 732 struct nvme_id_ctrl *id) 733 { 734 if (ctrl->subsys->cmic & (1 << 3)) 735 dev_warn(ctrl->device, 736 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n"); 737 return 0; 738 } 739 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl) 740 { 741 } 742 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl) 743 { 744 } 745 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) 746 { 747 } 748 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys) 749 { 750 } 751 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys) 752 { 753 } 754 #endif /* CONFIG_NVME_MULTIPATH */ 755 756 int nvme_revalidate_zones(struct nvme_ns *ns); 757 #ifdef CONFIG_BLK_DEV_ZONED 758 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf); 759 int nvme_report_zones(struct gendisk *disk, sector_t sector, 760 unsigned int nr_zones, report_zones_cb cb, void *data); 761 762 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req, 763 struct nvme_command *cmnd, 764 enum nvme_zone_mgmt_action action); 765 #else 766 #define nvme_report_zones NULL 767 768 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, 769 struct request *req, struct nvme_command *cmnd, 770 enum nvme_zone_mgmt_action action) 771 { 772 return BLK_STS_NOTSUPP; 773 } 774 775 static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf) 776 { 777 dev_warn(ns->ctrl->device, 778 "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n"); 779 return -EPROTONOSUPPORT; 780 } 781 #endif 782 783 #ifdef CONFIG_NVM 784 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); 785 void nvme_nvm_unregister(struct nvme_ns *ns); 786 extern const struct attribute_group nvme_nvm_attr_group; 787 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg); 788 #else 789 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, 790 int node) 791 { 792 return 0; 793 } 794 795 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {}; 796 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, 797 unsigned long arg) 798 { 799 return -ENOTTY; 800 } 801 #endif /* CONFIG_NVM */ 802 803 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev) 804 { 805 return dev_to_disk(dev)->private_data; 806 } 807 808 #ifdef CONFIG_NVME_HWMON 809 int nvme_hwmon_init(struct nvme_ctrl *ctrl); 810 #else 811 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl) 812 { 813 return 0; 814 } 815 #endif 816 817 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 818 u8 opcode); 819 void nvme_execute_passthru_rq(struct request *rq); 820 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file); 821 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid); 822 void nvme_put_ns(struct nvme_ns *ns); 823 824 #endif /* _NVME_H */ 825