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/pci.h>
  19 #include <linux/kref.h>
  20 #include <linux/blk-mq.h>
  21 #include <linux/lightnvm.h>
  22 #include <linux/sed-opal.h>
  23
  24 enum {
  25         /*
  26          * Driver internal status code for commands that were cancelled due
  27          * to timeouts or controller shutdown.  The value is negative so
  28          * that it a) doesn't overlap with the unsigned hardware error codes,
  29          * and b) can easily be tested for.
  30          */
  31         NVME_SC_CANCELLED               = -EINTR,
  32 };
  33
  34 extern unsigned char nvme_io_timeout;
  35 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  36
  37 extern unsigned char admin_timeout;
  38 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  39
  40 extern unsigned char shutdown_timeout;
  41 #define SHUTDOWN_TIMEOUT        (shutdown_timeout * HZ)
  42
  43 #define NVME_DEFAULT_KATO       5
  44 #define NVME_KATO_GRACE         10
  45
  46 extern unsigned int nvme_max_retries;
  47
  48 enum {
  49         NVME_NS_LBA             = 0,
  50         NVME_NS_LIGHTNVM        = 1,
  51 };
  52
  53 /*
  54  * List of workarounds for devices that required behavior not specified in
  55  * the standard.
  56  */
  57 enum nvme_quirks {
  58         /*
  59          * Prefers I/O aligned to a stripe size specified in a vendor
  60          * specific Identify field.
  61          */
  62         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  63
  64         /*
  65          * The controller doesn't handle Identify value others than 0 or 1
  66          * correctly.
  67          */
  68         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  69
  70         /*
  71          * The controller deterministically returns O's on reads to discarded
  72          * logical blocks.
  73          */
  74         NVME_QUIRK_DISCARD_ZEROES               = (1 << 2),
  75
  76         /*
  77          * The controller needs a delay before starts checking the device
  78          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  79          */
  80         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  81
  82         /*
  83          * APST should not be used.
  84          */
  85         NVME_QUIRK_NO_APST                      = (1 << 4),
  86
  87         /*
  88          * The deepest sleep state should not be used.
  89          */
  90         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  91 };
  92
  93 /*
  94  * Common request structure for NVMe passthrough.  All drivers must have
  95  * this structure as the first member of their request-private data.
  96  */
  97 struct nvme_request {
  98         struct nvme_command     *cmd;
  99         union nvme_result       result;
 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         struct kref kref;
 132         int instance;
 133         struct blk_mq_tag_set *tagset;
 134         struct list_head namespaces;
 135         struct mutex namespaces_mutex;
 136         struct device *device;  /* char device */
 137         struct list_head node;
 138         struct ida ns_ida;
 139
 140         struct opal_dev *opal_dev;
 141
 142         char name[12];
 143         char serial[20];
 144         char model[40];
 145         char firmware_rev[8];
 146         u16 cntlid;
 147
 148         u32 ctrl_config;
 149
 150         u32 page_size;
 151         u32 max_hw_sectors;
 152         u16 oncs;
 153         u16 vid;
 154         u16 oacs;
 155         atomic_t abort_limit;
 156         u8 event_limit;
 157         u8 vwc;
 158         u32 vs;
 159         u32 sgls;
 160         u16 kas;
 161         u8 npss;
 162         u8 apsta;
 163         unsigned int kato;
 164         bool subsystem;
 165         unsigned long quirks;
 166         struct nvme_id_power_state psd[32];
 167         struct work_struct scan_work;
 168         struct work_struct async_event_work;
 169         struct delayed_work ka_work;
 170
 171         /* Power saving configuration */
 172         u64 ps_max_latency_us;
 173
 174         /* Fabrics only */
 175         u16 sqsize;
 176         u32 ioccsz;
 177         u32 iorcsz;
 178         u16 icdoff;
 179         u16 maxcmd;
 180         struct nvmf_ctrl_options *opts;
 181 };
 182
 183 /*
 184  * An NVM Express namespace is equivalent to a SCSI LUN
 185  */
 186 struct nvme_ns {
 187         struct list_head list;
 188
 189         struct nvme_ctrl *ctrl;
 190         struct request_queue *queue;
 191         struct gendisk *disk;
 192         struct nvm_dev *ndev;
 193         struct kref kref;
 194         int instance;
 195
 196         u8 eui[8];
 197         u8 uuid[16];
 198
 199         unsigned ns_id;
 200         int lba_shift;
 201         u16 ms;
 202         bool ext;
 203         u8 pi_type;
 204         unsigned long flags;
 205
 206 #define NVME_NS_REMOVING 0
 207 #define NVME_NS_DEAD     1
 208
 209         u64 mode_select_num_blocks;
 210         u32 mode_select_block_len;
 211 };
 212
 213 struct nvme_ctrl_ops {
 214         const char *name;
 215         struct module *module;
 216         bool is_fabrics;
 217         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 218         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 219         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 220         int (*reset_ctrl)(struct nvme_ctrl *ctrl);
 221         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 222         void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
 223         int (*delete_ctrl)(struct nvme_ctrl *ctrl);
 224         const char *(*get_subsysnqn)(struct nvme_ctrl *ctrl);
 225         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 226 };
 227
 228 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 229 {
 230         u32 val = 0;
 231
 232         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 233                 return false;
 234         return val & NVME_CSTS_RDY;
 235 }
 236
 237 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 238 {
 239         if (!ctrl->subsystem)
 240                 return -ENOTTY;
 241         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 242 }
 243
 244 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 245 {
 246         return (sector >> (ns->lba_shift - 9));
 247 }
 248
 249 static inline void nvme_cleanup_cmd(struct request *req)
 250 {
 251         if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
 252                 kfree(page_address(req->special_vec.bv_page) +
 253                       req->special_vec.bv_offset);
 254         }
 255 }
 256
 257 static inline int nvme_error_status(u16 status)
 258 {
 259         switch (status & 0x7ff) {
 260         case NVME_SC_SUCCESS:
 261                 return 0;
 262         case NVME_SC_CAP_EXCEEDED:
 263                 return -ENOSPC;
 264         default:
 265                 return -EIO;
 266         }
 267 }
 268
 269 static inline bool nvme_req_needs_retry(struct request *req, u16 status)
 270 {
 271         return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
 272                 (jiffies - req->start_time) < req->timeout &&
 273                 req->retries < nvme_max_retries;
 274 }
 275
 276 void nvme_cancel_request(struct request *req, void *data, bool reserved);
 277 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 278                 enum nvme_ctrl_state new_state);
 279 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 280 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 281 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 282 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 283                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 284 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 285 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 286 int nvme_init_identify(struct nvme_ctrl *ctrl);
 287
 288 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 289 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 290
 291 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 292                 bool send);
 293
 294 #define NVME_NR_AERS    1
 295 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 296                 union nvme_result *res);
 297 void nvme_queue_async_events(struct nvme_ctrl *ctrl);
 298
 299 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 300 void nvme_start_queues(struct nvme_ctrl *ctrl);
 301 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 302 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 303 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 304 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 305 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 306
 307 #define NVME_QID_ANY -1
 308 struct request *nvme_alloc_request(struct request_queue *q,
 309                 struct nvme_command *cmd, unsigned int flags, int qid);
 310 void nvme_requeue_req(struct request *req);
 311 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 312                 struct nvme_command *cmd);
 313 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 314                 void *buf, unsigned bufflen);
 315 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 316                 union nvme_result *result, void *buffer, unsigned bufflen,
 317                 unsigned timeout, int qid, int at_head, int flags);
 318 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 319                 void __user *ubuffer, unsigned bufflen, u32 *result,
 320                 unsigned timeout);
 321 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 322                 void __user *ubuffer, unsigned bufflen,
 323                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 324                 u32 *result, unsigned timeout);
 325 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
 326 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 327                 struct nvme_id_ns **id);
 328 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
 329 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 330                       void *buffer, size_t buflen, u32 *result);
 331 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 332                       void *buffer, size_t buflen, u32 *result);
 333 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 334 void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
 335 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 336
 337 struct sg_io_hdr;
 338
 339 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 340 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 341 int nvme_sg_get_version_num(int __user *ip);
 342
 343 #ifdef CONFIG_NVM
 344 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
 345 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 346 void nvme_nvm_unregister(struct nvme_ns *ns);
 347 int nvme_nvm_register_sysfs(struct nvme_ns *ns);
 348 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
 349 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 350 #else
 351 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 352                                     int node)
 353 {
 354         return 0;
 355 }
 356
 357 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 358 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
 359 {
 360         return 0;
 361 }
 362 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
 363 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 364 {
 365         return 0;
 366 }
 367 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 368                                                         unsigned long arg)
 369 {
 370         return -ENOTTY;
 371 }
 372 #endif /* CONFIG_NVM */
 373
 374 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 375 {
 376         return dev_to_disk(dev)->private_data;
 377 }
 378
 379 int __init nvme_core_init(void);
 380 void nvme_core_exit(void);
 381
 382 #endif /* _NVME_H */