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
  36 enum {
  37         NVME_NS_LBA             = 0,
  38         NVME_NS_LIGHTNVM        = 1,
  39 };
  40
  41 /*
  42  * List of workarounds for devices that required behavior not specified in
  43  * the standard.
  44  */
  45 enum nvme_quirks {
  46         /*
  47          * Prefers I/O aligned to a stripe size specified in a vendor
  48          * specific Identify field.
  49          */
  50         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  51
  52         /*
  53          * The controller doesn't handle Identify value others than 0 or 1
  54          * correctly.
  55          */
  56         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  57
  58         /*
  59          * The controller deterministically returns O's on reads to
  60          * logical blocks that deallocate was called on.
  61          */
  62         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  63
  64         /*
  65          * The controller needs a delay before starts checking the device
  66          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  67          */
  68         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  69
  70         /*
  71          * APST should not be used.
  72          */
  73         NVME_QUIRK_NO_APST                      = (1 << 4),
  74
  75         /*
  76          * The deepest sleep state should not be used.
  77          */
  78         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  79
  80         /*
  81          * Supports the LighNVM command set if indicated in vs[1].
  82          */
  83         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  84 };
  85
  86 /*
  87  * Common request structure for NVMe passthrough.  All drivers must have
  88  * this structure as the first member of their request-private data.
  89  */
  90 struct nvme_request {
  91         struct nvme_command     *cmd;
  92         union nvme_result       result;
  93         u8                      retries;
  94         u8                      flags;
  95         u16                     status;
  96 };
  97
  98 enum {
  99         NVME_REQ_CANCELLED              = (1 << 0),
 100 };
 101
 102 static inline struct nvme_request *nvme_req(struct request *req)
 103 {
 104         return blk_mq_rq_to_pdu(req);
 105 }
 106
 107 /* The below value is the specific amount of delay needed before checking
 108  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 109  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 110  * found empirically.
 111  */
 112 #define NVME_QUIRK_DELAY_AMOUNT         2000
 113
 114 enum nvme_ctrl_state {
 115         NVME_CTRL_NEW,
 116         NVME_CTRL_LIVE,
 117         NVME_CTRL_RESETTING,
 118         NVME_CTRL_RECONNECTING,
 119         NVME_CTRL_DELETING,
 120         NVME_CTRL_DEAD,
 121 };
 122
 123 struct nvme_ctrl {
 124         enum nvme_ctrl_state state;
 125         bool identified;
 126         spinlock_t lock;
 127         const struct nvme_ctrl_ops *ops;
 128         struct request_queue *admin_q;
 129         struct request_queue *connect_q;
 130         struct device *dev;
 131         int instance;
 132         struct blk_mq_tag_set *tagset;
 133         struct blk_mq_tag_set *admin_tagset;
 134         struct list_head namespaces;
 135         struct mutex namespaces_mutex;
 136         struct device ctrl_device;
 137         struct device *device;  /* char device */
 138         struct cdev cdev;
 139         struct ida ns_ida;
 140         struct work_struct reset_work;
 141         struct work_struct delete_work;
 142
 143         struct nvme_subsystem *subsys;
 144         struct list_head subsys_entry;
 145
 146         struct opal_dev *opal_dev;
 147
 148         char name[12];
 149         u16 cntlid;
 150
 151         u32 ctrl_config;
 152         u16 mtfa;
 153         u32 queue_count;
 154
 155         u64 cap;
 156         u32 page_size;
 157         u32 max_hw_sectors;
 158         u16 oncs;
 159         u16 oacs;
 160         u16 nssa;
 161         u16 nr_streams;
 162         atomic_t abort_limit;
 163         u8 vwc;
 164         u32 vs;
 165         u32 sgls;
 166         u16 kas;
 167         u8 npss;
 168         u8 apsta;
 169         u32 aen_result;
 170         unsigned int shutdown_timeout;
 171         unsigned int kato;
 172         bool subsystem;
 173         unsigned long quirks;
 174         struct nvme_id_power_state psd[32];
 175         struct nvme_effects_log *effects;
 176         struct work_struct scan_work;
 177         struct work_struct async_event_work;
 178         struct delayed_work ka_work;
 179         struct work_struct fw_act_work;
 180
 181         /* Power saving configuration */
 182         u64 ps_max_latency_us;
 183         bool apst_enabled;
 184
 185         /* PCIe only: */
 186         u32 hmpre;
 187         u32 hmmin;
 188         u32 hmminds;
 189         u16 hmmaxd;
 190
 191         /* Fabrics only */
 192         u16 sqsize;
 193         u32 ioccsz;
 194         u32 iorcsz;
 195         u16 icdoff;
 196         u16 maxcmd;
 197         int nr_reconnects;
 198         struct nvmf_ctrl_options *opts;
 199 };
 200
 201 struct nvme_subsystem {
 202         int                     instance;
 203         struct device           dev;
 204         /*
 205          * Because we unregister the device on the last put we need
 206          * a separate refcount.
 207          */
 208         struct kref             ref;
 209         struct list_head        entry;
 210         struct mutex            lock;
 211         struct list_head        ctrls;
 212         char                    subnqn[NVMF_NQN_SIZE];
 213         char                    serial[20];
 214         char                    model[40];
 215         char                    firmware_rev[8];
 216         u8                      cmic;
 217         u16                     vendor_id;
 218 };
 219
 220 struct nvme_ns {
 221         struct list_head list;
 222
 223         struct nvme_ctrl *ctrl;
 224         struct request_queue *queue;
 225         struct gendisk *disk;
 226         struct nvm_dev *ndev;
 227         struct kref kref;
 228         int instance;
 229
 230         u8 eui[8];
 231         u8 nguid[16];
 232         uuid_t uuid;
 233
 234         unsigned ns_id;
 235         int lba_shift;
 236         u16 ms;
 237         u16 sgs;
 238         u32 sws;
 239         bool ext;
 240         u8 pi_type;
 241         unsigned long flags;
 242 #define NVME_NS_REMOVING 0
 243 #define NVME_NS_DEAD     1
 244         u16 noiob;
 245 };
 246
 247 struct nvme_ctrl_ops {
 248         const char *name;
 249         struct module *module;
 250         unsigned int flags;
 251 #define NVME_F_FABRICS                  (1 << 0)
 252 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 253         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 254         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 255         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 256         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 257         void (*submit_async_event)(struct nvme_ctrl *ctrl);
 258         void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 259         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 260         int (*reinit_request)(void *data, struct request *rq);
 261 };
 262
 263 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 264 {
 265         u32 val = 0;
 266
 267         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 268                 return false;
 269         return val & NVME_CSTS_RDY;
 270 }
 271
 272 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 273 {
 274         if (!ctrl->subsystem)
 275                 return -ENOTTY;
 276         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 277 }
 278
 279 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 280 {
 281         return (sector >> (ns->lba_shift - 9));
 282 }
 283
 284 static inline void nvme_cleanup_cmd(struct request *req)
 285 {
 286         if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
 287                 kfree(page_address(req->special_vec.bv_page) +
 288                       req->special_vec.bv_offset);
 289         }
 290 }
 291
 292 static inline void nvme_end_request(struct request *req, __le16 status,
 293                 union nvme_result result)
 294 {
 295         struct nvme_request *rq = nvme_req(req);
 296
 297         rq->status = le16_to_cpu(status) >> 1;
 298         rq->result = result;
 299         blk_mq_complete_request(req);
 300 }
 301
 302 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
 303 {
 304         get_device(ctrl->device);
 305 }
 306
 307 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 308 {
 309         put_device(ctrl->device);
 310 }
 311
 312 void nvme_complete_rq(struct request *req);
 313 void nvme_cancel_request(struct request *req, void *data, bool reserved);
 314 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 315                 enum nvme_ctrl_state new_state);
 316 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 317 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 318 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 319 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 320                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 321 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 322 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 323 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 324 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 325 int nvme_init_identify(struct nvme_ctrl *ctrl);
 326
 327 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 328 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 329
 330 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 331                 bool send);
 332
 333 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 334                 union nvme_result *res);
 335
 336 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 337 void nvme_start_queues(struct nvme_ctrl *ctrl);
 338 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 339 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 340 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 341 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 342 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 343 int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set);
 344
 345 #define NVME_QID_ANY -1
 346 struct request *nvme_alloc_request(struct request_queue *q,
 347                 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid);
 348 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 349                 struct nvme_command *cmd);
 350 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 351                 void *buf, unsigned bufflen);
 352 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 353                 union nvme_result *result, void *buffer, unsigned bufflen,
 354                 unsigned timeout, int qid, int at_head,
 355                 blk_mq_req_flags_t flags);
 356 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 357 void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
 358 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 359 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 360 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
 361 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
 362
 363 #ifdef CONFIG_NVM
 364 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 365 void nvme_nvm_unregister(struct nvme_ns *ns);
 366 int nvme_nvm_register_sysfs(struct nvme_ns *ns);
 367 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
 368 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 369 #else
 370 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 371                                     int node)
 372 {
 373         return 0;
 374 }
 375
 376 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 377 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
 378 {
 379         return 0;
 380 }
 381 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
 382 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 383                                                         unsigned long arg)
 384 {
 385         return -ENOTTY;
 386 }
 387 #endif /* CONFIG_NVM */
 388
 389 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 390 {
 391         return dev_to_disk(dev)->private_data;
 392 }
 393
 394 int __init nvme_core_init(void);
 395 void nvme_core_exit(void);
 396
 397 #endif /* _NVME_H */