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