drivers/nvme/host/nvme.h

   1 /*
   2  * Copyright (c) 2011-2014, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #ifndef _NVME_H
  15 #define _NVME_H
  16
  17 #include <linux/nvme.h>
  18 #include <linux/cdev.h>
  19 #include <linux/pci.h>
  20 #include <linux/kref.h>
  21 #include <linux/blk-mq.h>
  22 #include <linux/lightnvm.h>
  23 #include <linux/sed-opal.h>
  24 #include <linux/fault-inject.h>
  25 #include <linux/rcupdate.h>
  26
  27 extern unsigned int nvme_io_timeout;
  28 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  29
  30 extern unsigned int admin_timeout;
  31 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  32
  33 #define NVME_DEFAULT_KATO       5
  34 #define NVME_KATO_GRACE         10
  35
  36 extern struct workqueue_struct *nvme_wq;
  37 extern struct workqueue_struct *nvme_reset_wq;
  38 extern struct workqueue_struct *nvme_delete_wq;
  39
  40 enum {
  41         NVME_NS_LBA             = 0,
  42         NVME_NS_LIGHTNVM        = 1,
  43 };
  44
  45 /*
  46  * List of workarounds for devices that required behavior not specified in
  47  * the standard.
  48  */
  49 enum nvme_quirks {
  50         /*
  51          * Prefers I/O aligned to a stripe size specified in a vendor
  52          * specific Identify field.
  53          */
  54         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  55
  56         /*
  57          * The controller doesn't handle Identify value others than 0 or 1
  58          * correctly.
  59          */
  60         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  61
  62         /*
  63          * The controller deterministically returns O's on reads to
  64          * logical blocks that deallocate was called on.
  65          */
  66         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  67
  68         /*
  69          * The controller needs a delay before starts checking the device
  70          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  71          */
  72         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  73
  74         /*
  75          * APST should not be used.
  76          */
  77         NVME_QUIRK_NO_APST                      = (1 << 4),
  78
  79         /*
  80          * The deepest sleep state should not be used.
  81          */
  82         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  83
  84         /*
  85          * Supports the LighNVM command set if indicated in vs[1].
  86          */
  87         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  88
  89         /*
  90          * Set MEDIUM priority on SQ creation
  91          */
  92         NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
  93 };
  94
  95 /*
  96  * Common request structure for NVMe passthrough.  All drivers must have
  97  * this structure as the first member of their request-private data.
  98  */
  99 struct nvme_request {
 100         struct nvme_command     *cmd;
 101         union nvme_result       result;
 102         u8                      retries;
 103         u8                      flags;
 104         u16                     status;
 105         struct nvme_ctrl        *ctrl;
 106 };
 107
 108 /*
 109  * Mark a bio as coming in through the mpath node.
 110  */
 111 #define REQ_NVME_MPATH          REQ_DRV
 112
 113 enum {
 114         NVME_REQ_CANCELLED              = (1 << 0),
 115         NVME_REQ_USERCMD                = (1 << 1),
 116 };
 117
 118 static inline struct nvme_request *nvme_req(struct request *req)
 119 {
 120         return blk_mq_rq_to_pdu(req);
 121 }
 122
 123 static inline u16 nvme_req_qid(struct request *req)
 124 {
 125         if (!req->rq_disk)
 126                 return 0;
 127         return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1;
 128 }
 129
 130 /* The below value is the specific amount of delay needed before checking
 131  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 132  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 133  * found empirically.
 134  */
 135 #define NVME_QUIRK_DELAY_AMOUNT         2300
 136
 137 enum nvme_ctrl_state {
 138         NVME_CTRL_NEW,
 139         NVME_CTRL_LIVE,
 140         NVME_CTRL_ADMIN_ONLY,    /* Only admin queue live */
 141         NVME_CTRL_RESETTING,
 142         NVME_CTRL_CONNECTING,
 143         NVME_CTRL_DELETING,
 144         NVME_CTRL_DEAD,
 145 };
 146
 147 struct nvme_ctrl {
 148         enum nvme_ctrl_state state;
 149         bool identified;
 150         spinlock_t lock;
 151         const struct nvme_ctrl_ops *ops;
 152         struct request_queue *admin_q;
 153         struct request_queue *connect_q;
 154         struct device *dev;
 155         int instance;
 156         struct blk_mq_tag_set *tagset;
 157         struct blk_mq_tag_set *admin_tagset;
 158         struct list_head namespaces;
 159         struct rw_semaphore namespaces_rwsem;
 160         struct device ctrl_device;
 161         struct device *device;  /* char device */
 162         struct cdev cdev;
 163         struct work_struct reset_work;
 164         struct work_struct delete_work;
 165
 166         struct nvme_subsystem *subsys;
 167         struct list_head subsys_entry;
 168
 169         struct opal_dev *opal_dev;
 170
 171         char name[12];
 172         u16 cntlid;
 173
 174         u32 ctrl_config;
 175         u16 mtfa;
 176         u32 queue_count;
 177
 178         u64 cap;
 179         u32 page_size;
 180         u32 max_hw_sectors;
 181         u32 max_segments;
 182         u16 oncs;
 183         u16 oacs;
 184         u16 nssa;
 185         u16 nr_streams;
 186         u32 max_namespaces;
 187         atomic_t abort_limit;
 188         u8 vwc;
 189         u32 vs;
 190         u32 sgls;
 191         u16 kas;
 192         u8 npss;
 193         u8 apsta;
 194         u32 oaes;
 195         u32 aen_result;
 196         unsigned int shutdown_timeout;
 197         unsigned int kato;
 198         bool subsystem;
 199         unsigned long quirks;
 200         struct nvme_id_power_state psd[32];
 201         struct nvme_effects_log *effects;
 202         struct work_struct scan_work;
 203         struct work_struct async_event_work;
 204         struct delayed_work ka_work;
 205         struct nvme_command ka_cmd;
 206         struct work_struct fw_act_work;
 207         unsigned long events;
 208
 209 #ifdef CONFIG_NVME_MULTIPATH
 210         /* asymmetric namespace access: */
 211         u8 anacap;
 212         u8 anatt;
 213         u32 anagrpmax;
 214         u32 nanagrpid;
 215         struct mutex ana_lock;
 216         struct nvme_ana_rsp_hdr *ana_log_buf;
 217         size_t ana_log_size;
 218         struct timer_list anatt_timer;
 219         struct work_struct ana_work;
 220 #endif
 221
 222         /* Power saving configuration */
 223         u64 ps_max_latency_us;
 224         bool apst_enabled;
 225
 226         /* PCIe only: */
 227         u32 hmpre;
 228         u32 hmmin;
 229         u32 hmminds;
 230         u16 hmmaxd;
 231
 232         /* Fabrics only */
 233         u16 sqsize;
 234         u32 ioccsz;
 235         u32 iorcsz;
 236         u16 icdoff;
 237         u16 maxcmd;
 238         int nr_reconnects;
 239         struct nvmf_ctrl_options *opts;
 240 };
 241
 242 struct nvme_subsystem {
 243         int                     instance;
 244         struct device           dev;
 245         /*
 246          * Because we unregister the device on the last put we need
 247          * a separate refcount.
 248          */
 249         struct kref             ref;
 250         struct list_head        entry;
 251         struct mutex            lock;
 252         struct list_head        ctrls;
 253         struct list_head        nsheads;
 254         char                    subnqn[NVMF_NQN_SIZE];
 255         char                    serial[20];
 256         char                    model[40];
 257         char                    firmware_rev[8];
 258         u8                      cmic;
 259         u16                     vendor_id;
 260         struct ida              ns_ida;
 261 };
 262
 263 /*
 264  * Container structure for uniqueue namespace identifiers.
 265  */
 266 struct nvme_ns_ids {
 267         u8      eui64[8];
 268         u8      nguid[16];
 269         uuid_t  uuid;
 270 };
 271
 272 /*
 273  * Anchor structure for namespaces.  There is one for each namespace in a
 274  * NVMe subsystem that any of our controllers can see, and the namespace
 275  * structure for each controller is chained of it.  For private namespaces
 276  * there is a 1:1 relation to our namespace structures, that is ->list
 277  * only ever has a single entry for private namespaces.
 278  */
 279 struct nvme_ns_head {
 280         struct list_head        list;
 281         struct srcu_struct      srcu;
 282         struct nvme_subsystem   *subsys;
 283         unsigned                ns_id;
 284         struct nvme_ns_ids      ids;
 285         struct list_head        entry;
 286         struct kref             ref;
 287         int                     instance;
 288 #ifdef CONFIG_NVME_MULTIPATH
 289         struct gendisk          *disk;
 290         struct bio_list         requeue_list;
 291         spinlock_t              requeue_lock;
 292         struct work_struct      requeue_work;
 293         struct mutex            lock;
 294         struct nvme_ns __rcu    *current_path[];
 295 #endif
 296 };
 297
 298 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 299 struct nvme_fault_inject {
 300         struct fault_attr attr;
 301         struct dentry *parent;
 302         bool dont_retry;        /* DNR, do not retry */
 303         u16 status;             /* status code */
 304 };
 305 #endif
 306
 307 struct nvme_ns {
 308         struct list_head list;
 309
 310         struct nvme_ctrl *ctrl;
 311         struct request_queue *queue;
 312         struct gendisk *disk;
 313 #ifdef CONFIG_NVME_MULTIPATH
 314         enum nvme_ana_state ana_state;
 315         u32 ana_grpid;
 316 #endif
 317         struct list_head siblings;
 318         struct nvm_dev *ndev;
 319         struct kref kref;
 320         struct nvme_ns_head *head;
 321
 322         int lba_shift;
 323         u16 ms;
 324         u16 sgs;
 325         u32 sws;
 326         bool ext;
 327         u8 pi_type;
 328         unsigned long flags;
 329 #define NVME_NS_REMOVING        0
 330 #define NVME_NS_DEAD            1
 331 #define NVME_NS_ANA_PENDING     2
 332         u16 noiob;
 333
 334 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 335         struct nvme_fault_inject fault_inject;
 336 #endif
 337
 338 };
 339
 340 struct nvme_ctrl_ops {
 341         const char *name;
 342         struct module *module;
 343         unsigned int flags;
 344 #define NVME_F_FABRICS                  (1 << 0)
 345 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 346 #define NVME_F_PCI_P2PDMA               (1 << 2)
 347         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 348         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 349         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 350         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 351         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 352         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 353         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 354         void (*stop_ctrl)(struct nvme_ctrl *ctrl);
 355 };
 356
 357 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 358 void nvme_fault_inject_init(struct nvme_ns *ns);
 359 void nvme_fault_inject_fini(struct nvme_ns *ns);
 360 void nvme_should_fail(struct request *req);
 361 #else
 362 static inline void nvme_fault_inject_init(struct nvme_ns *ns) {}
 363 static inline void nvme_fault_inject_fini(struct nvme_ns *ns) {}
 364 static inline void nvme_should_fail(struct request *req) {}
 365 #endif
 366
 367 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 368 {
 369         u32 val = 0;
 370
 371         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 372                 return false;
 373         return val & NVME_CSTS_RDY;
 374 }
 375
 376 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 377 {
 378         if (!ctrl->subsystem)
 379                 return -ENOTTY;
 380         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 381 }
 382
 383 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 384 {
 385         return (sector >> (ns->lba_shift - 9));
 386 }
 387
 388 static inline void nvme_end_request(struct request *req, __le16 status,
 389                 union nvme_result result)
 390 {
 391         struct nvme_request *rq = nvme_req(req);
 392
 393         rq->status = le16_to_cpu(status) >> 1;
 394         rq->result = result;
 395         /* inject error when permitted by fault injection framework */
 396         nvme_should_fail(req);
 397         blk_mq_complete_request(req);
 398 }
 399
 400 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 401 {
 402         get_device(ctrl->device);
 403 }
 404
 405 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 406 {
 407         put_device(ctrl->device);
 408 }
 409
 410 void nvme_complete_rq(struct request *req);
 411 void nvme_cancel_request(struct request *req, void *data, bool reserved);
 412 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 413                 enum nvme_ctrl_state new_state);
 414 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 415 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 416 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 417 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 418                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 419 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 420 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 421 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 422 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 423 int nvme_init_identify(struct nvme_ctrl *ctrl);
 424
 425 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 426
 427 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 428                 bool send);
 429
 430 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 431                 volatile union nvme_result *res);
 432
 433 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 434 void nvme_start_queues(struct nvme_ctrl *ctrl);
 435 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 436 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 437 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 438 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 439 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 440
 441 #define NVME_QID_ANY -1
 442 struct request *nvme_alloc_request(struct request_queue *q,
 443                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 444 void nvme_cleanup_cmd(struct request *req);
 445 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 446                 struct nvme_command *cmd);
 447 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 448                 void *buf, unsigned bufflen);
 449 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 450                 union nvme_result *result, void *buffer, unsigned bufflen,
 451                 unsigned timeout, int qid, int at_head,
 452                 blk_mq_req_flags_t flags);
 453 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 454 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 455 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 456 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 457 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 458 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
 459
 460 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
 461                 void *log, size_t size, u64 offset);
 462
 463 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 464 extern const struct block_device_operations nvme_ns_head_ops;
 465
 466 #ifdef CONFIG_NVME_MULTIPATH
 467 bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl);
 468 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 469                         struct nvme_ctrl *ctrl, int *flags);
 470 void nvme_failover_req(struct request *req);
 471 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 472 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 473 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
 474 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 475 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
 476 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 477 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 478 void nvme_mpath_clear_current_path(struct nvme_ns *ns);
 479 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 480
 481 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 482 {
 483         struct nvme_ns_head *head = ns->head;
 484
 485         if (head->disk && list_empty(&head->list))
 486                 kblockd_schedule_work(&head->requeue_work);
 487 }
 488
 489 extern struct device_attribute dev_attr_ana_grpid;
 490 extern struct device_attribute dev_attr_ana_state;
 491
 492 #else
 493 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 494 {
 495         return false;
 496 }
 497 /*
 498  * Without the multipath code enabled, multiple controller per subsystems are
 499  * visible as devices and thus we cannot use the subsystem instance.
 500  */
 501 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 502                                       struct nvme_ctrl *ctrl, int *flags)
 503 {
 504         sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 505 }
 506
 507 static inline void nvme_failover_req(struct request *req)
 508 {
 509 }
 510 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 511 {
 512 }
 513 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 514                 struct nvme_ns_head *head)
 515 {
 516         return 0;
 517 }
 518 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
 519                 struct nvme_id_ns *id)
 520 {
 521 }
 522 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 523 {
 524 }
 525 static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
 526 {
 527 }
 528 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 529 {
 530 }
 531 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
 532                 struct nvme_id_ctrl *id)
 533 {
 534         if (ctrl->subsys->cmic & (1 << 3))
 535                 dev_warn(ctrl->device,
 536 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
 537         return 0;
 538 }
 539 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 540 {
 541 }
 542 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 543 {
 544 }
 545 #endif /* CONFIG_NVME_MULTIPATH */
 546
 547 #ifdef CONFIG_NVM
 548 void nvme_nvm_update_nvm_info(struct nvme_ns *ns);
 549 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 550 void nvme_nvm_unregister(struct nvme_ns *ns);
 551 extern const struct attribute_group nvme_nvm_attr_group;
 552 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 553 #else
 554 static inline void nvme_nvm_update_nvm_info(struct nvme_ns *ns) {};
 555 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 556                                     int node)
 557 {
 558         return 0;
 559 }
 560
 561 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 562 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 563                                                         unsigned long arg)
 564 {
 565         return -ENOTTY;
 566 }
 567 #endif /* CONFIG_NVM */
 568
 569 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 570 {
 571         return dev_to_disk(dev)->private_data;
 572 }
 573
 574 int __init nvme_core_init(void);
 575 void nvme_core_exit(void);
 576
 577 #endif /* _NVME_H */