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
  22 enum {
  23         /*
  24          * Driver internal status code for commands that were cancelled due
  25          * to timeouts or controller shutdown.  The value is negative so
  26          * that it a) doesn't overlap with the unsigned hardware error codes,
  27          * and b) can easily be tested for.
  28          */
  29         NVME_SC_CANCELLED               = -EINTR,
  30 };
  31
  32 extern unsigned char nvme_io_timeout;
  33 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
  34
  35 extern unsigned char admin_timeout;
  36 #define ADMIN_TIMEOUT   (admin_timeout * HZ)
  37
  38 extern unsigned char shutdown_timeout;
  39 #define SHUTDOWN_TIMEOUT        (shutdown_timeout * HZ)
  40
  41 enum {
  42         NVME_NS_LBA             = 0,
  43         NVME_NS_LIGHTNVM        = 1,
  44 };
  45
  46 /*
  47  * List of workarounds for devices that required behavior not specified in
  48  * the standard.
  49  */
  50 enum nvme_quirks {
  51         /*
  52          * Prefers I/O aligned to a stripe size specified in a vendor
  53          * specific Identify field.
  54          */
  55         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  56
  57         /*
  58          * The controller doesn't handle Identify value others than 0 or 1
  59          * correctly.
  60          */
  61         NVME_QUIRK_IDENTIFY_CNS                 = (1 << 1),
  62
  63         /*
  64          * The controller deterministically returns O's on reads to discarded
  65          * logical blocks.
  66          */
  67         NVME_QUIRK_DISCARD_ZEROES               = (1 << 2),
  68 };
  69
  70 enum nvme_ctrl_state {
  71         NVME_CTRL_NEW,
  72         NVME_CTRL_LIVE,
  73         NVME_CTRL_RESETTING,
  74         NVME_CTRL_DELETING,
  75 };
  76
  77 struct nvme_ctrl {
  78         enum nvme_ctrl_state state;
  79         spinlock_t lock;
  80         const struct nvme_ctrl_ops *ops;
  81         struct request_queue *admin_q;
  82         struct device *dev;
  83         struct kref kref;
  84         int instance;
  85         struct blk_mq_tag_set *tagset;
  86         struct list_head namespaces;
  87         struct mutex namespaces_mutex;
  88         struct device *device;  /* char device */
  89         struct list_head node;
  90         struct ida ns_ida;
  91
  92         char name[12];
  93         char serial[20];
  94         char model[40];
  95         char firmware_rev[8];
  96         u16 cntlid;
  97
  98         u32 ctrl_config;
  99
 100         u32 page_size;
 101         u32 max_hw_sectors;
 102         u32 stripe_size;
 103         u16 oncs;
 104         u16 vid;
 105         atomic_t abort_limit;
 106         u8 event_limit;
 107         u8 vwc;
 108         u32 vs;
 109         bool subsystem;
 110         unsigned long quirks;
 111         struct work_struct scan_work;
 112         struct work_struct async_event_work;
 113 };
 114
 115 /*
 116  * An NVM Express namespace is equivalent to a SCSI LUN
 117  */
 118 struct nvme_ns {
 119         struct list_head list;
 120
 121         struct nvme_ctrl *ctrl;
 122         struct request_queue *queue;
 123         struct gendisk *disk;
 124         struct kref kref;
 125         int instance;
 126
 127         u8 eui[8];
 128         u8 uuid[16];
 129
 130         unsigned ns_id;
 131         int lba_shift;
 132         u16 ms;
 133         bool ext;
 134         u8 pi_type;
 135         int type;
 136         unsigned long flags;
 137
 138 #define NVME_NS_REMOVING 0
 139 #define NVME_NS_DEAD     1
 140
 141         u64 mode_select_num_blocks;
 142         u32 mode_select_block_len;
 143 };
 144
 145 struct nvme_ctrl_ops {
 146         struct module *module;
 147         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 148         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 149         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 150         int (*reset_ctrl)(struct nvme_ctrl *ctrl);
 151         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 152         void (*post_scan)(struct nvme_ctrl *ctrl);
 153         void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
 154 };
 155
 156 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 157 {
 158         u32 val = 0;
 159
 160         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 161                 return false;
 162         return val & NVME_CSTS_RDY;
 163 }
 164
 165 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 166 {
 167         if (!ctrl->subsystem)
 168                 return -ENOTTY;
 169         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 170 }
 171
 172 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 173 {
 174         return (sector >> (ns->lba_shift - 9));
 175 }
 176
 177 static inline unsigned nvme_map_len(struct request *rq)
 178 {
 179         if (rq->cmd_flags & REQ_DISCARD)
 180                 return sizeof(struct nvme_dsm_range);
 181         else
 182                 return blk_rq_bytes(rq);
 183 }
 184
 185 static inline void nvme_cleanup_cmd(struct request *req)
 186 {
 187         if (req->cmd_flags & REQ_DISCARD)
 188                 kfree(req->completion_data);
 189 }
 190
 191 static inline int nvme_error_status(u16 status)
 192 {
 193         switch (status & 0x7ff) {
 194         case NVME_SC_SUCCESS:
 195                 return 0;
 196         case NVME_SC_CAP_EXCEEDED:
 197                 return -ENOSPC;
 198         default:
 199                 return -EIO;
 200         }
 201 }
 202
 203 static inline bool nvme_req_needs_retry(struct request *req, u16 status)
 204 {
 205         return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
 206                 (jiffies - req->start_time) < req->timeout;
 207 }
 208
 209 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 210                 enum nvme_ctrl_state new_state);
 211 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 212 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 213 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 214 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 215                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 216 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 217 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 218 int nvme_init_identify(struct nvme_ctrl *ctrl);
 219
 220 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 221 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 222
 223 #define NVME_NR_AERS    1
 224 void nvme_complete_async_event(struct nvme_ctrl *ctrl,
 225                 struct nvme_completion *cqe);
 226 void nvme_queue_async_events(struct nvme_ctrl *ctrl);
 227
 228 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 229 void nvme_start_queues(struct nvme_ctrl *ctrl);
 230 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 231
 232 struct request *nvme_alloc_request(struct request_queue *q,
 233                 struct nvme_command *cmd, unsigned int flags);
 234 void nvme_requeue_req(struct request *req);
 235 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 236                 struct nvme_command *cmd);
 237 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 238                 void *buf, unsigned bufflen);
 239 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 240                 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
 241                 unsigned timeout);
 242 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 243                 void __user *ubuffer, unsigned bufflen, u32 *result,
 244                 unsigned timeout);
 245 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 246                 void __user *ubuffer, unsigned bufflen,
 247                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 248                 u32 *result, unsigned timeout);
 249 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
 250 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 251                 struct nvme_id_ns **id);
 252 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
 253 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 254                         dma_addr_t dma_addr, u32 *result);
 255 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 256                         dma_addr_t dma_addr, u32 *result);
 257 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 258
 259 struct sg_io_hdr;
 260
 261 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 262 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 263 int nvme_sg_get_version_num(int __user *ip);
 264
 265 #ifdef CONFIG_NVM
 266 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
 267 int nvme_nvm_register(struct request_queue *q, char *disk_name);
 268 void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
 269 #else
 270 static inline int nvme_nvm_register(struct request_queue *q, char *disk_name)
 271 {
 272         return 0;
 273 }
 274
 275 static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
 276
 277 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 278 {
 279         return 0;
 280 }
 281 #endif /* CONFIG_NVM */
 282
 283 int __init nvme_core_init(void);
 284 void nvme_core_exit(void);
 285
 286 #endif /* _NVME_H */