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
  25 extern unsigned int nvme_io_timeout;
  26 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  27
  28 extern unsigned int admin_timeout;
  29 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  30
  31 #define NVME_DEFAULT_KATO       5
  32 #define NVME_KATO_GRACE         10
  33
  34 extern struct workqueue_struct *nvme_wq;
  35 extern struct workqueue_struct *nvme_reset_wq;
  36 extern struct workqueue_struct *nvme_delete_wq;
  37
  38 enum {
  39         NVME_NS_LBA             = 0,
  40         NVME_NS_LIGHTNVM        = 1,
  41 };
  42
  43 /*
  44  * List of workarounds for devices that required behavior not specified in
  45  * the standard.
  46  */
  47 enum nvme_quirks {
  48         /*
  49          * Prefers I/O aligned to a stripe size specified in a vendor
  50          * specific Identify field.
  51          */
  52         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  53
  54         /*
  55          * The controller doesn't handle Identify value others than 0 or 1
  56          * correctly.
  57          */
  58         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  59
  60         /*
  61          * The controller deterministically returns O's on reads to
  62          * logical blocks that deallocate was called on.
  63          */
  64         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  65
  66         /*
  67          * The controller needs a delay before starts checking the device
  68          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  69          */
  70         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  71
  72         /*
  73          * APST should not be used.
  74          */
  75         NVME_QUIRK_NO_APST                      = (1 << 4),
  76
  77         /*
  78          * The deepest sleep state should not be used.
  79          */
  80         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  81
  82         /*
  83          * Supports the LighNVM command set if indicated in vs[1].
  84          */
  85         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  86 };
  87
  88 /*
  89  * Common request structure for NVMe passthrough.  All drivers must have
  90  * this structure as the first member of their request-private data.
  91  */
  92 struct nvme_request {
  93         struct nvme_command     *cmd;
  94         union nvme_result       result;
  95         u8                      retries;
  96         u8                      flags;
  97         u16                     status;
  98 };
  99
 100 /*
 101  * Mark a bio as coming in through the mpath node.
 102  */
 103 #define REQ_NVME_MPATH          REQ_DRV
 104
 105 enum {
 106         NVME_REQ_CANCELLED              = (1 << 0),
 107 };
 108
 109 static inline struct nvme_request *nvme_req(struct request *req)
 110 {
 111         return blk_mq_rq_to_pdu(req);
 112 }
 113
 114 /* The below value is the specific amount of delay needed before checking
 115  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 116  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 117  * found empirically.
 118  */
 119 #define NVME_QUIRK_DELAY_AMOUNT         2300
 120
 121 enum nvme_ctrl_state {
 122         NVME_CTRL_NEW,
 123         NVME_CTRL_LIVE,
 124         NVME_CTRL_ADMIN_ONLY,    /* Only admin queue live */
 125         NVME_CTRL_RESETTING,
 126         NVME_CTRL_CONNECTING,
 127         NVME_CTRL_DELETING,
 128         NVME_CTRL_DEAD,
 129 };
 130
 131 struct nvme_ctrl {
 132         enum nvme_ctrl_state state;
 133         bool identified;
 134         spinlock_t lock;
 135         const struct nvme_ctrl_ops *ops;
 136         struct request_queue *admin_q;
 137         struct request_queue *connect_q;
 138         struct device *dev;
 139         int instance;
 140         struct blk_mq_tag_set *tagset;
 141         struct blk_mq_tag_set *admin_tagset;
 142         struct list_head namespaces;
 143         struct mutex namespaces_mutex;
 144         struct device ctrl_device;
 145         struct device *device;  /* char device */
 146         struct cdev cdev;
 147         struct work_struct reset_work;
 148         struct work_struct delete_work;
 149
 150         struct nvme_subsystem *subsys;
 151         struct list_head subsys_entry;
 152
 153         struct opal_dev *opal_dev;
 154
 155         char name[12];
 156         u16 cntlid;
 157
 158         u32 ctrl_config;
 159         u16 mtfa;
 160         u32 queue_count;
 161
 162         u64 cap;
 163         u32 page_size;
 164         u32 max_hw_sectors;
 165         u16 oncs;
 166         u16 oacs;
 167         u16 nssa;
 168         u16 nr_streams;
 169         atomic_t abort_limit;
 170         u8 vwc;
 171         u32 vs;
 172         u32 sgls;
 173         u16 kas;
 174         u8 npss;
 175         u8 apsta;
 176         u32 aen_result;
 177         unsigned int shutdown_timeout;
 178         unsigned int kato;
 179         bool subsystem;
 180         unsigned long quirks;
 181         struct nvme_id_power_state psd[32];
 182         struct nvme_effects_log *effects;
 183         struct work_struct scan_work;
 184         struct work_struct async_event_work;
 185         struct delayed_work ka_work;
 186         struct nvme_command ka_cmd;
 187         struct work_struct fw_act_work;
 188
 189         /* Power saving configuration */
 190         u64 ps_max_latency_us;
 191         bool apst_enabled;
 192
 193         /* PCIe only: */
 194         u32 hmpre;
 195         u32 hmmin;
 196         u32 hmminds;
 197         u16 hmmaxd;
 198
 199         /* Fabrics only */
 200         u16 sqsize;
 201         u32 ioccsz;
 202         u32 iorcsz;
 203         u16 icdoff;
 204         u16 maxcmd;
 205         int nr_reconnects;
 206         struct nvmf_ctrl_options *opts;
 207 };
 208
 209 struct nvme_subsystem {
 210         int                     instance;
 211         struct device           dev;
 212         /*
 213          * Because we unregister the device on the last put we need
 214          * a separate refcount.
 215          */
 216         struct kref             ref;
 217         struct list_head        entry;
 218         struct mutex            lock;
 219         struct list_head        ctrls;
 220         struct list_head        nsheads;
 221         char                    subnqn[NVMF_NQN_SIZE];
 222         char                    serial[20];
 223         char                    model[40];
 224         char                    firmware_rev[8];
 225         u8                      cmic;
 226         u16                     vendor_id;
 227         struct ida              ns_ida;
 228 };
 229
 230 /*
 231  * Container structure for uniqueue namespace identifiers.
 232  */
 233 struct nvme_ns_ids {
 234         u8      eui64[8];
 235         u8      nguid[16];
 236         uuid_t  uuid;
 237 };
 238
 239 /*
 240  * Anchor structure for namespaces.  There is one for each namespace in a
 241  * NVMe subsystem that any of our controllers can see, and the namespace
 242  * structure for each controller is chained of it.  For private namespaces
 243  * there is a 1:1 relation to our namespace structures, that is ->list
 244  * only ever has a single entry for private namespaces.
 245  */
 246 struct nvme_ns_head {
 247 #ifdef CONFIG_NVME_MULTIPATH
 248         struct gendisk          *disk;
 249         struct nvme_ns __rcu    *current_path;
 250         struct bio_list         requeue_list;
 251         spinlock_t              requeue_lock;
 252         struct work_struct      requeue_work;
 253 #endif
 254         struct list_head        list;
 255         struct srcu_struct      srcu;
 256         struct nvme_subsystem   *subsys;
 257         unsigned                ns_id;
 258         struct nvme_ns_ids      ids;
 259         struct list_head        entry;
 260         struct kref             ref;
 261         int                     instance;
 262 };
 263
 264 struct nvme_ns {
 265         struct list_head list;
 266
 267         struct nvme_ctrl *ctrl;
 268         struct request_queue *queue;
 269         struct gendisk *disk;
 270         struct list_head siblings;
 271         struct nvm_dev *ndev;
 272         struct kref kref;
 273         struct nvme_ns_head *head;
 274
 275         int lba_shift;
 276         u16 ms;
 277         u16 sgs;
 278         u32 sws;
 279         bool ext;
 280         u8 pi_type;
 281         unsigned long flags;
 282 #define NVME_NS_REMOVING 0
 283 #define NVME_NS_DEAD     1
 284         u16 noiob;
 285 };
 286
 287 struct nvme_ctrl_ops {
 288         const char *name;
 289         struct module *module;
 290         unsigned int flags;
 291 #define NVME_F_FABRICS                  (1 << 0)
 292 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 293         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 294         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 295         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 296         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 297         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 298         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 299         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 300         int (*reinit_request)(void *data, struct request *rq);
 301 };
 302
 303 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 304 {
 305         u32 val = 0;
 306
 307         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 308                 return false;
 309         return val & NVME_CSTS_RDY;
 310 }
 311
 312 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 313 {
 314         if (!ctrl->subsystem)
 315                 return -ENOTTY;
 316         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 317 }
 318
 319 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 320 {
 321         return (sector >> (ns->lba_shift - 9));
 322 }
 323
 324 static inline void nvme_cleanup_cmd(struct request *req)
 325 {
 326         if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
 327                 kfree(page_address(req->special_vec.bv_page) +
 328                       req->special_vec.bv_offset);
 329         }
 330 }
 331
 332 static inline void nvme_end_request(struct request *req, __le16 status,
 333                 union nvme_result result)
 334 {
 335         struct nvme_request *rq = nvme_req(req);
 336
 337         rq->status = le16_to_cpu(status) >> 1;
 338         rq->result = result;
 339         blk_mq_complete_request(req);
 340 }
 341
 342 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 343 {
 344         get_device(ctrl->device);
 345 }
 346
 347 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 348 {
 349         put_device(ctrl->device);
 350 }
 351
 352 void nvme_complete_rq(struct request *req);
 353 void nvme_cancel_request(struct request *req, void *data, bool reserved);
 354 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 355                 enum nvme_ctrl_state new_state);
 356 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 357 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 358 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 359 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 360                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 361 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 362 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 363 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 364 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 365 int nvme_init_identify(struct nvme_ctrl *ctrl);
 366
 367 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 368 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 369
 370 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 371                 bool send);
 372
 373 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 374                 union nvme_result *res);
 375
 376 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 377 void nvme_start_queues(struct nvme_ctrl *ctrl);
 378 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 379 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 380 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 381 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 382 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 383 int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set);
 384
 385 #define NVME_QID_ANY -1
 386 struct request *nvme_alloc_request(struct request_queue *q,
 387                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 388 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 389                 struct nvme_command *cmd);
 390 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 391                 void *buf, unsigned bufflen);
 392 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 393                 union nvme_result *result, void *buffer, unsigned bufflen,
 394                 unsigned timeout, int qid, int at_head,
 395                 blk_mq_req_flags_t flags);
 396 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 397 void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
 398 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 399 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 400 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 401 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 402 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
 403
 404 extern const struct attribute_group nvme_ns_id_attr_group;
 405 extern const struct block_device_operations nvme_ns_head_ops;
 406
 407 #ifdef CONFIG_NVME_MULTIPATH
 408 void nvme_failover_req(struct request *req);
 409 bool nvme_req_needs_failover(struct request *req, blk_status_t error);
 410 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 411 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 412 void nvme_mpath_add_disk(struct nvme_ns_head *head);
 413 void nvme_mpath_add_disk_links(struct nvme_ns *ns);
 414 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 415 void nvme_mpath_remove_disk_links(struct nvme_ns *ns);
 416
 417 static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
 418 {
 419         struct nvme_ns_head *head = ns->head;
 420
 421         if (head && ns == srcu_dereference(head->current_path, &head->srcu))
 422                 rcu_assign_pointer(head->current_path, NULL);
 423 }
 424 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
 425
 426 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 427 {
 428         struct nvme_ns_head *head = ns->head;
 429
 430         if (head->disk && list_empty(&head->list))
 431                 kblockd_schedule_work(&head->requeue_work);
 432 }
 433
 434 #else
 435 static inline void nvme_failover_req(struct request *req)
 436 {
 437 }
 438 static inline bool nvme_req_needs_failover(struct request *req,
 439                                            blk_status_t error)
 440 {
 441         return false;
 442 }
 443 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 444 {
 445 }
 446 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
 447                 struct nvme_ns_head *head)
 448 {
 449         return 0;
 450 }
 451 static inline void nvme_mpath_add_disk(struct nvme_ns_head *head)
 452 {
 453 }
 454 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 455 {
 456 }
 457 static inline void nvme_mpath_add_disk_links(struct nvme_ns *ns)
 458 {
 459 }
 460 static inline void nvme_mpath_remove_disk_links(struct nvme_ns *ns)
 461 {
 462 }
 463 static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
 464 {
 465 }
 466 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
 467 {
 468 }
 469 #endif /* CONFIG_NVME_MULTIPATH */
 470
 471 #ifdef CONFIG_NVM
 472 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 473 void nvme_nvm_unregister(struct nvme_ns *ns);
 474 int nvme_nvm_register_sysfs(struct nvme_ns *ns);
 475 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
 476 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 477 #else
 478 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 479                                     int node)
 480 {
 481         return 0;
 482 }
 483
 484 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 485 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
 486 {
 487         return 0;
 488 }
 489 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
 490 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 491                                                         unsigned long arg)
 492 {
 493         return -ENOTTY;
 494 }
 495 #endif /* CONFIG_NVM */
 496
 497 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 498 {
 499         return dev_to_disk(dev)->private_data;
 500 }
 501
 502 int __init nvme_core_init(void);
 503 void nvme_core_exit(void);
 504
 505 #endif /* _NVME_H */