2 * Copyright (c) 2011-2014, Intel Corporation.
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.
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
17 #include <linux/nvme.h>
18 #include <linux/pci.h>
19 #include <linux/kref.h>
20 #include <linux/blk-mq.h>
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.
29 NVME_SC_CANCELLED
= -EINTR
,
32 extern unsigned char nvme_io_timeout
;
33 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
35 extern unsigned char admin_timeout
;
36 #define ADMIN_TIMEOUT (admin_timeout * HZ)
38 extern unsigned char shutdown_timeout
;
39 #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
47 * List of workarounds for devices that required behavior not specified in
52 * Prefers I/O aligned to a stripe size specified in a vendor
53 * specific Identify field.
55 NVME_QUIRK_STRIPE_SIZE
= (1 << 0),
58 * The controller doesn't handle Identify value others than 0 or 1
61 NVME_QUIRK_IDENTIFY_CNS
= (1 << 1),
64 * The controller deterministically returns O's on reads to discarded
67 NVME_QUIRK_DISCARD_ZEROES
= (1 << 2),
70 enum nvme_ctrl_state
{
78 enum nvme_ctrl_state state
;
80 const struct nvme_ctrl_ops
*ops
;
81 struct request_queue
*admin_q
;
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
;
105 atomic_t abort_limit
;
110 unsigned long quirks
;
114 * An NVM Express namespace is equivalent to a SCSI LUN
117 struct list_head list
;
119 struct nvme_ctrl
*ctrl
;
120 struct request_queue
*queue
;
121 struct gendisk
*disk
;
136 #define NVME_NS_REMOVING 0
137 #define NVME_NS_DEAD 1
139 u64 mode_select_num_blocks
;
140 u32 mode_select_block_len
;
143 struct nvme_ctrl_ops
{
144 struct module
*module
;
145 int (*reg_read32
)(struct nvme_ctrl
*ctrl
, u32 off
, u32
*val
);
146 int (*reg_write32
)(struct nvme_ctrl
*ctrl
, u32 off
, u32 val
);
147 int (*reg_read64
)(struct nvme_ctrl
*ctrl
, u32 off
, u64
*val
);
148 int (*reset_ctrl
)(struct nvme_ctrl
*ctrl
);
149 void (*free_ctrl
)(struct nvme_ctrl
*ctrl
);
152 static inline bool nvme_ctrl_ready(struct nvme_ctrl
*ctrl
)
156 if (ctrl
->ops
->reg_read32(ctrl
, NVME_REG_CSTS
, &val
))
158 return val
& NVME_CSTS_RDY
;
161 static inline int nvme_reset_subsystem(struct nvme_ctrl
*ctrl
)
163 if (!ctrl
->subsystem
)
165 return ctrl
->ops
->reg_write32(ctrl
, NVME_REG_NSSR
, 0x4E564D65);
168 static inline u64
nvme_block_nr(struct nvme_ns
*ns
, sector_t sector
)
170 return (sector
>> (ns
->lba_shift
- 9));
173 static inline unsigned nvme_map_len(struct request
*rq
)
175 if (rq
->cmd_flags
& REQ_DISCARD
)
176 return sizeof(struct nvme_dsm_range
);
178 return blk_rq_bytes(rq
);
181 static inline int nvme_error_status(u16 status
)
183 switch (status
& 0x7ff) {
184 case NVME_SC_SUCCESS
:
186 case NVME_SC_CAP_EXCEEDED
:
193 static inline bool nvme_req_needs_retry(struct request
*req
, u16 status
)
195 return !(status
& NVME_SC_DNR
|| blk_noretry_request(req
)) &&
196 (jiffies
- req
->start_time
) < req
->timeout
;
199 bool nvme_change_ctrl_state(struct nvme_ctrl
*ctrl
,
200 enum nvme_ctrl_state new_state
);
201 int nvme_disable_ctrl(struct nvme_ctrl
*ctrl
, u64 cap
);
202 int nvme_enable_ctrl(struct nvme_ctrl
*ctrl
, u64 cap
);
203 int nvme_shutdown_ctrl(struct nvme_ctrl
*ctrl
);
204 int nvme_init_ctrl(struct nvme_ctrl
*ctrl
, struct device
*dev
,
205 const struct nvme_ctrl_ops
*ops
, unsigned long quirks
);
206 void nvme_uninit_ctrl(struct nvme_ctrl
*ctrl
);
207 void nvme_put_ctrl(struct nvme_ctrl
*ctrl
);
208 int nvme_init_identify(struct nvme_ctrl
*ctrl
);
210 void nvme_scan_namespaces(struct nvme_ctrl
*ctrl
);
211 void nvme_remove_namespaces(struct nvme_ctrl
*ctrl
);
213 void nvme_stop_queues(struct nvme_ctrl
*ctrl
);
214 void nvme_start_queues(struct nvme_ctrl
*ctrl
);
215 void nvme_kill_queues(struct nvme_ctrl
*ctrl
);
217 struct request
*nvme_alloc_request(struct request_queue
*q
,
218 struct nvme_command
*cmd
, unsigned int flags
);
219 void nvme_requeue_req(struct request
*req
);
220 int nvme_setup_cmd(struct nvme_ns
*ns
, struct request
*req
,
221 struct nvme_command
*cmd
);
222 int nvme_submit_sync_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
223 void *buf
, unsigned bufflen
);
224 int __nvme_submit_sync_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
225 struct nvme_completion
*cqe
, void *buffer
, unsigned bufflen
,
227 int nvme_submit_user_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
228 void __user
*ubuffer
, unsigned bufflen
, u32
*result
,
230 int __nvme_submit_user_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
231 void __user
*ubuffer
, unsigned bufflen
,
232 void __user
*meta_buffer
, unsigned meta_len
, u32 meta_seed
,
233 u32
*result
, unsigned timeout
);
234 int nvme_identify_ctrl(struct nvme_ctrl
*dev
, struct nvme_id_ctrl
**id
);
235 int nvme_identify_ns(struct nvme_ctrl
*dev
, unsigned nsid
,
236 struct nvme_id_ns
**id
);
237 int nvme_get_log_page(struct nvme_ctrl
*dev
, struct nvme_smart_log
**log
);
238 int nvme_get_features(struct nvme_ctrl
*dev
, unsigned fid
, unsigned nsid
,
239 dma_addr_t dma_addr
, u32
*result
);
240 int nvme_set_features(struct nvme_ctrl
*dev
, unsigned fid
, unsigned dword11
,
241 dma_addr_t dma_addr
, u32
*result
);
242 int nvme_set_queue_count(struct nvme_ctrl
*ctrl
, int *count
);
246 int nvme_sg_io(struct nvme_ns
*ns
, struct sg_io_hdr __user
*u_hdr
);
247 int nvme_sg_io32(struct nvme_ns
*ns
, unsigned long arg
);
248 int nvme_sg_get_version_num(int __user
*ip
);
251 int nvme_nvm_ns_supported(struct nvme_ns
*ns
, struct nvme_id_ns
*id
);
252 int nvme_nvm_register(struct request_queue
*q
, char *disk_name
);
253 void nvme_nvm_unregister(struct request_queue
*q
, char *disk_name
);
255 static inline int nvme_nvm_register(struct request_queue
*q
, char *disk_name
)
260 static inline void nvme_nvm_unregister(struct request_queue
*q
, char *disk_name
) {};
262 static inline int nvme_nvm_ns_supported(struct nvme_ns
*ns
, struct nvme_id_ns
*id
)
266 #endif /* CONFIG_NVM */
268 int __init
nvme_core_init(void);
269 void nvme_core_exit(void);