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