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