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 };
 113
 114 /*
 115  * An NVM Express namespace is equivalent to a SCSI LUN
 116  */
 117 struct nvme_ns {
 118         struct list_head list;
 119
 120         struct nvme_ctrl *ctrl;
 121         struct request_queue *queue;
 122         struct gendisk *disk;
 123         struct kref kref;
 124         int instance;
 125
 126         u8 eui[8];
 127         u8 uuid[16];
 128
 129         unsigned ns_id;
 130         int lba_shift;
 131         u16 ms;
 132         bool ext;
 133         u8 pi_type;
 134         int type;
 135         unsigned long flags;
 136
 137 #define NVME_NS_REMOVING 0
 138 #define NVME_NS_DEAD     1
 139
 140         u64 mode_select_num_blocks;
 141         u32 mode_select_block_len;
 142 };
 143
 144 struct nvme_ctrl_ops {
 145         struct module *module;
 146         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 147         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 148         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 149         int (*reset_ctrl)(struct nvme_ctrl *ctrl);
 150         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 151         void (*post_scan)(struct nvme_ctrl *ctrl);
 152 };
 153
 154 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 155 {
 156         u32 val = 0;
 157
 158         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 159                 return false;
 160         return val & NVME_CSTS_RDY;
 161 }
 162
 163 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 164 {
 165         if (!ctrl->subsystem)
 166                 return -ENOTTY;
 167         return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 168 }
 169
 170 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 171 {
 172         return (sector >> (ns->lba_shift - 9));
 173 }
 174
 175 static inline unsigned nvme_map_len(struct request *rq)
 176 {
 177         if (rq->cmd_flags & REQ_DISCARD)
 178                 return sizeof(struct nvme_dsm_range);
 179         else
 180                 return blk_rq_bytes(rq);
 181 }
 182
 183 static inline int nvme_error_status(u16 status)
 184 {
 185         switch (status & 0x7ff) {
 186         case NVME_SC_SUCCESS:
 187                 return 0;
 188         case NVME_SC_CAP_EXCEEDED:
 189                 return -ENOSPC;
 190         default:
 191                 return -EIO;
 192         }
 193 }
 194
 195 static inline bool nvme_req_needs_retry(struct request *req, u16 status)
 196 {
 197         return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
 198                 (jiffies - req->start_time) < req->timeout;
 199 }
 200
 201 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 202                 enum nvme_ctrl_state new_state);
 203 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 204 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 205 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 206 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 207                 const struct nvme_ctrl_ops *ops, unsigned long quirks);
 208 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 209 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 210 int nvme_init_identify(struct nvme_ctrl *ctrl);
 211
 212 void nvme_queue_scan(struct nvme_ctrl *ctrl);
 213 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 214
 215 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 216 void nvme_start_queues(struct nvme_ctrl *ctrl);
 217 void nvme_kill_queues(struct nvme_ctrl *ctrl);
 218
 219 struct request *nvme_alloc_request(struct request_queue *q,
 220                 struct nvme_command *cmd, unsigned int flags);
 221 void nvme_requeue_req(struct request *req);
 222 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 223                 struct nvme_command *cmd);
 224 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 225                 void *buf, unsigned bufflen);
 226 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 227                 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
 228                 unsigned timeout);
 229 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 230                 void __user *ubuffer, unsigned bufflen, u32 *result,
 231                 unsigned timeout);
 232 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 233                 void __user *ubuffer, unsigned bufflen,
 234                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 235                 u32 *result, unsigned timeout);
 236 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
 237 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 238                 struct nvme_id_ns **id);
 239 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
 240 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 241                         dma_addr_t dma_addr, u32 *result);
 242 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 243                         dma_addr_t dma_addr, u32 *result);
 244 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 245
 246 struct sg_io_hdr;
 247
 248 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 249 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 250 int nvme_sg_get_version_num(int __user *ip);
 251
 252 #ifdef CONFIG_NVM
 253 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
 254 int nvme_nvm_register(struct request_queue *q, char *disk_name);
 255 void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
 256 #else
 257 static inline int nvme_nvm_register(struct request_queue *q, char *disk_name)
 258 {
 259         return 0;
 260 }
 261
 262 static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
 263
 264 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 265 {
 266         return 0;
 267 }
 268 #endif /* CONFIG_NVM */
 269
 270 int __init nvme_core_init(void);
 271 void nvme_core_exit(void);
 272
 273 #endif /* _NVME_H */