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 extern unsigned char nvme_io_timeout;
  25 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  26
  27 extern unsigned char admin_timeout;
  28 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  29
  30 #define NVME_DEFAULT_KATO       5
  31 #define NVME_KATO_GRACE         10
  32
  33 extern struct workqueue_struct *nvme_wq;
  34
  35 enum {
  36         NVME_NS_LBA             = 0,
  37         NVME_NS_LIGHTNVM        = 1,
  38 };
  39
  40 /*
  41  * List of workarounds for devices that required behavior not specified in
  42  * the standard.
  43  */
  44 enum nvme_quirks {
  45         /*
  46          * Prefers I/O aligned to a stripe size specified in a vendor
  47          * specific Identify field.
  48          */
  49         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  50
  51         /*
  52          * The controller doesn't handle Identify value others than 0 or 1
  53          * correctly.
  54          */
  55         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  56
  57         /*
  58          * The controller deterministically returns O's on reads to
  59          * logical blocks that deallocate was called on.
  60          */
  61         NVME_QUIRK_DEALLOCATE_ZEROES            = (1 << 2),
  62
  63         /*
  64          * The controller needs a delay before starts checking the device
  65          * readiness, which is done by reading the NVME_CSTS_RDY bit.
  66          */
  67         NVME_QUIRK_DELAY_BEFORE_CHK_RDY         = (1 << 3),
  68
  69         /*
  70          * APST should not be used.
  71          */
  72         NVME_QUIRK_NO_APST                      = (1 << 4),
  73
  74         /*
  75          * The deepest sleep state should not be used.
  76          */
  77         NVME_QUIRK_NO_DEEPEST_PS                = (1 << 5),
  78
  79         /*
  80          * Supports the LighNVM command set if indicated in vs[1].
  81          */
  82         NVME_QUIRK_LIGHTNVM                     = (1 << 6),
  83 };
  84
  85 /*
  86  * Common request structure for NVMe passthrough.  All drivers must have
  87  * this structure as the first member of their request-private data.
  88  */
  89 struct nvme_request {
  90         struct nvme_command     *cmd;
  91         union nvme_result       result;
  92         u8                      retries;
  93         u8                      flags;
  94         u16                     status;
  95 };
  96
  97 enum {
  98         NVME_REQ_CANCELLED              = (1 << 0),
  99 };
 100
 101 static inline struct nvme_request *nvme_req(struct request *req)
 102 {
 103         return blk_mq_rq_to_pdu(req);
 104 }
 105
 106 /* The below value is the specific amount of delay needed before checking
 107  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 108  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 109  * found empirically.
 110  */
 111 #define NVME_QUIRK_DELAY_AMOUNT         2000
 112
 113 enum nvme_ctrl_state {
 114         NVME_CTRL_NEW,
 115         NVME_CTRL_LIVE,
 116         NVME_CTRL_RESETTING,
 117         NVME_CTRL_RECONNECTING,
 118         NVME_CTRL_DELETING,
 119         NVME_CTRL_DEAD,
 120 };
 121
 122 struct nvme_ctrl {
 123         enum nvme_ctrl_state state;
 124         bool identified;
 125         spinlock_t lock;
 126         const struct nvme_ctrl_ops *ops;
 127         struct request_queue *admin_q;
 128         struct request_queue *connect_q;
 129         struct device *dev;
 130         struct kref kref;
 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 *device;  /* char device */
 137         struct list_head node;
 138         struct ida ns_ida;
 139         struct work_struct reset_work;
 140
 141         struct opal_dev *opal_dev;
 142
 143         char name[12];
 144         char serial[20];
 145         char model[40];
 146         char firmware_rev[8];
 147         char subnqn[NVMF_NQN_SIZE];
 148         u16 cntlid;
 149
 150         u32 ctrl_config;
 151         u16 mtfa;
 152         u32 queue_count;
 153
 154         u64 cap;
 155         u32 page_size;
 156         u32 max_hw_sectors;
 157         u16 oncs;
 158         u16 vid;
 159         u16 oacs;
 160         u16 nssa;
 161         u16 nr_streams;
 162         atomic_t abort_limit;
 163         u8 event_limit;
 164         u8 vwc;
 165         u32 vs;
 166         u32 sgls;
 167         u16 kas;
 168         u8 npss;
 169         u8 apsta;
 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 work_struct scan_work;
 176         struct work_struct async_event_work;
 177         struct delayed_work ka_work;
 178         struct work_struct fw_act_work;
 179
 180         /* Power saving configuration */
 181         u64 ps_max_latency_us;
 182         bool apst_enabled;
 183
 184         /* PCIe only: */
 185         u32 hmpre;
 186         u32 hmmin;
 187         u32 hmminds;
 188         u16 hmmaxd;
 189
 190         /* Fabrics only */
 191         u16 sqsize;
 192         u32 ioccsz;
 193         u32 iorcsz;
 194         u16 icdoff;
 195         u16 maxcmd;
 196         int nr_reconnects;
 197         struct nvmf_ctrl_options *opts;
 198 };
 199
 200 struct nvme_ns {
 201         struct list_head list;
 202
 203         struct nvme_ctrl *ctrl;
 204         struct request_queue *queue;
 205         struct gendisk *disk;
 206         struct nvm_dev *ndev;
 207         struct kref kref;
 208         int instance;
 209
 210         u8 eui[8];
 211         u8 nguid[16];
 212         uuid_t uuid;
 213
 214         unsigned ns_id;
 215         int lba_shift;
 216         u16 ms;
 217         u16 sgs;
 218         u32 sws;
 219         bool ext;
 220         u8 pi_type;
 221         unsigned long flags;
 222 #define NVME_NS_REMOVING 0
 223 #define NVME_NS_DEAD     1
 224         u16 noiob;
 225 };
 226
 227 struct nvme_ctrl_ops {
 228         const char *name;
 229         struct module *module;
 230         unsigned int flags;
 231 #define NVME_F_FABRICS                  (1 << 0)
 232 #define NVME_F_METADATA_SUPPORTED       (1 << 1)
 233         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 234         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 235         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 236         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 237         void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
 238         int (*delete_ctrl)(struct nvme_ctrl *ctrl);
 239         int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
 240 };
 241
 242 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 243 {
 244         u32 val = 0;
 245
 246         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 247                 return false;
 248         return val & NVME_CSTS_RDY;
 249 }
 250
 251 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 252 {
 253         if (!ctrl->subsystem)
 254                 return -ENOTTY;
 255         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 256 }
 257
 258 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 259 {
 260         return (sector >> (ns->lba_shift - 9));
 261 }
 262
 263 static inline void nvme_cleanup_cmd(struct request *req)
 264 {
 265         if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
 266                 kfree(page_address(req->special_vec.bv_page) +
 267                       req->special_vec.bv_offset);
 268         }
 269 }
 270
 271 static inline void nvme_end_request(struct request *req, __le16 status,
 272                 union nvme_result result)
 273 {
 274         struct nvme_request *rq = nvme_req(req);
 275
 276         rq->status = le16_to_cpu(status) >> 1;
 277         rq->result = result;
 278         blk_mq_complete_request(req);
 279 }
 280
 281 void nvme_complete_rq(struct request *req);
 282 void nvme_cancel_request(struct request *req, void *data, bool reserved);
 283 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 284                 enum nvme_ctrl_state new_state);
 285 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 286 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 287 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 288 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 289                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 290 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 291 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 292 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 293 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 294 int nvme_init_identify(struct nvme_ctrl *ctrl);
 295
 296 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 297 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 298
 299 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 300                 bool send);
 301
 302 #define NVME_NR_AERS    1
 303 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
 304                 union nvme_result *res);
 305 void nvme_queue_async_events(struct nvme_ctrl *ctrl);
 306
 307 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 308 void nvme_start_queues(struct nvme_ctrl *ctrl);
 309 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 310 void nvme_unfreeze(struct nvme_ctrl *ctrl);
 311 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 312 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 313 void nvme_start_freeze(struct nvme_ctrl *ctrl);
 314
 315 #define NVME_QID_ANY -1
 316 struct request *nvme_alloc_request(struct request_queue *q,
 317                 struct nvme_command *cmd, unsigned int flags, int qid);
 318 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 319                 struct nvme_command *cmd);
 320 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 321                 void *buf, unsigned bufflen);
 322 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 323                 union nvme_result *result, void *buffer, unsigned bufflen,
 324                 unsigned timeout, int qid, int at_head, int flags);
 325 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 326 void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
 327 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
 328 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 329
 330 #ifdef CONFIG_NVM
 331 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 332 void nvme_nvm_unregister(struct nvme_ns *ns);
 333 int nvme_nvm_register_sysfs(struct nvme_ns *ns);
 334 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
 335 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 336 #else
 337 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 338                                     int node)
 339 {
 340         return 0;
 341 }
 342
 343 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
 344 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
 345 {
 346         return 0;
 347 }
 348 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
 349 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
 350                                                         unsigned long arg)
 351 {
 352         return -ENOTTY;
 353 }
 354 #endif /* CONFIG_NVM */
 355
 356 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 357 {
 358         return dev_to_disk(dev)->private_data;
 359 }
 360
 361 int __init nvme_core_init(void);
 362 void nvme_core_exit(void);
 363
 364 #endif /* _NVME_H */