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 struct nvme_passthru_cmd;
  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 extern unsigned char shutdown_timeout;
  31 #define SHUTDOWN_TIMEOUT        (shutdown_timeout * HZ)
  32
  33 enum {
  34         NVME_NS_LBA             = 0,
  35         NVME_NS_LIGHTNVM        = 1,
  36 };
  37
  38 /*
  39  * List of workarounds for devices that required behavior not specified in
  40  * the standard.
  41  */
  42 enum nvme_quirks {
  43         /*
  44          * Prefers I/O aligned to a stripe size specified in a vendor
  45          * specific Identify field.
  46          */
  47         NVME_QUIRK_STRIPE_SIZE                  = (1 << 0),
  48 };
  49
  50 struct nvme_ctrl {
  51         const struct nvme_ctrl_ops *ops;
  52         struct request_queue *admin_q;
  53         struct device *dev;
  54         struct kref kref;
  55         int instance;
  56
  57         char name[12];
  58         char serial[20];
  59         char model[40];
  60         char firmware_rev[8];
  61
  62         u32 ctrl_config;
  63
  64         u32 page_size;
  65         u32 max_hw_sectors;
  66         u32 stripe_size;
  67         u16 oncs;
  68         u16 abort_limit;
  69         u8 event_limit;
  70         u8 vwc;
  71         unsigned long quirks;
  72 };
  73
  74 /*
  75  * An NVM Express namespace is equivalent to a SCSI LUN
  76  */
  77 struct nvme_ns {
  78         struct list_head list;
  79
  80         struct nvme_ctrl *ctrl;
  81         struct request_queue *queue;
  82         struct gendisk *disk;
  83         struct kref kref;
  84
  85         unsigned ns_id;
  86         int lba_shift;
  87         u16 ms;
  88         bool ext;
  89         u8 pi_type;
  90         int type;
  91         u64 mode_select_num_blocks;
  92         u32 mode_select_block_len;
  93 };
  94
  95 struct nvme_ctrl_ops {
  96         int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
  97         int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
  98         int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
  99         void (*free_ctrl)(struct nvme_ctrl *ctrl);
 100 };
 101
 102 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 103 {
 104         u32 val = 0;
 105
 106         if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 107                 return false;
 108         return val & NVME_CSTS_RDY;
 109 }
 110
 111 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 112 {
 113         return (sector >> (ns->lba_shift - 9));
 114 }
 115
 116 static inline void nvme_setup_flush(struct nvme_ns *ns,
 117                 struct nvme_command *cmnd)
 118 {
 119         memset(cmnd, 0, sizeof(*cmnd));
 120         cmnd->common.opcode = nvme_cmd_flush;
 121         cmnd->common.nsid = cpu_to_le32(ns->ns_id);
 122 }
 123
 124 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
 125                 struct nvme_command *cmnd)
 126 {
 127         u16 control = 0;
 128         u32 dsmgmt = 0;
 129
 130         if (req->cmd_flags & REQ_FUA)
 131                 control |= NVME_RW_FUA;
 132         if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
 133                 control |= NVME_RW_LR;
 134
 135         if (req->cmd_flags & REQ_RAHEAD)
 136                 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
 137
 138         memset(cmnd, 0, sizeof(*cmnd));
 139         cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
 140         cmnd->rw.command_id = req->tag;
 141         cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
 142         cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 143         cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
 144
 145         if (ns->ms) {
 146                 switch (ns->pi_type) {
 147                 case NVME_NS_DPS_PI_TYPE3:
 148                         control |= NVME_RW_PRINFO_PRCHK_GUARD;
 149                         break;
 150                 case NVME_NS_DPS_PI_TYPE1:
 151                 case NVME_NS_DPS_PI_TYPE2:
 152                         control |= NVME_RW_PRINFO_PRCHK_GUARD |
 153                                         NVME_RW_PRINFO_PRCHK_REF;
 154                         cmnd->rw.reftag = cpu_to_le32(
 155                                         nvme_block_nr(ns, blk_rq_pos(req)));
 156                         break;
 157                 }
 158                 if (!blk_integrity_rq(req))
 159                         control |= NVME_RW_PRINFO_PRACT;
 160         }
 161
 162         cmnd->rw.control = cpu_to_le16(control);
 163         cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
 164 }
 165
 166
 167 static inline int nvme_error_status(u16 status)
 168 {
 169         switch (status & 0x7ff) {
 170         case NVME_SC_SUCCESS:
 171                 return 0;
 172         case NVME_SC_CAP_EXCEEDED:
 173                 return -ENOSPC;
 174         default:
 175                 return -EIO;
 176         }
 177 }
 178
 179 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 180 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 181 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 182 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 183 int nvme_init_identify(struct nvme_ctrl *ctrl);
 184 void nvme_put_ns(struct nvme_ns *ns);
 185
 186 struct request *nvme_alloc_request(struct request_queue *q,
 187                 struct nvme_command *cmd, unsigned int flags);
 188 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 189                 void *buf, unsigned bufflen);
 190 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 191                 void *buffer, unsigned bufflen,  u32 *result, unsigned timeout);
 192 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 193                 void __user *ubuffer, unsigned bufflen, u32 *result,
 194                 unsigned timeout);
 195 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 196                 void __user *ubuffer, unsigned bufflen,
 197                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 198                 u32 *result, unsigned timeout);
 199 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
 200 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 201                 struct nvme_id_ns **id);
 202 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
 203 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 204                         dma_addr_t dma_addr, u32 *result);
 205 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 206                         dma_addr_t dma_addr, u32 *result);
 207
 208 extern const struct block_device_operations nvme_fops;
 209 extern spinlock_t dev_list_lock;
 210
 211 int nvme_revalidate_disk(struct gendisk *disk);
 212 int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 213                         struct nvme_passthru_cmd __user *ucmd);
 214
 215 struct sg_io_hdr;
 216
 217 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 218 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 219 int nvme_sg_get_version_num(int __user *ip);
 220
 221 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
 222 int nvme_nvm_register(struct request_queue *q, char *disk_name);
 223 void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
 224
 225 #endif /* _NVME_H */