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 {
79 enum nvme_ctrl_state state;
81 const struct nvme_ctrl_ops *ops;
82 struct request_queue *admin_q;
86 struct blk_mq_tag_set *tagset;
87 struct list_head namespaces;
88 struct mutex namespaces_mutex;
89 struct device *device; /* char device */
90 struct list_head node;
106 atomic_t abort_limit;
111 unsigned long quirks;
112 struct work_struct scan_work;
113 struct work_struct async_event_work;
117 * An NVM Express namespace is equivalent to a SCSI LUN
120 struct list_head list;
122 struct nvme_ctrl *ctrl;
123 struct request_queue *queue;
124 struct gendisk *disk;
139 #define NVME_NS_REMOVING 0
140 #define NVME_NS_DEAD 1
142 u64 mode_select_num_blocks;
143 u32 mode_select_block_len;
146 struct nvme_ctrl_ops {
147 struct module *module;
148 int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
149 int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
150 int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
151 int (*reset_ctrl)(struct nvme_ctrl *ctrl);
152 void (*free_ctrl)(struct nvme_ctrl *ctrl);
153 void (*post_scan)(struct nvme_ctrl *ctrl);
154 void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
157 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
161 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
163 return val & NVME_CSTS_RDY;
166 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
168 if (!ctrl->subsystem)
170 return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
173 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
175 return (sector >> (ns->lba_shift - 9));
178 static inline unsigned nvme_map_len(struct request *rq)
180 if (req_op(rq) == REQ_OP_DISCARD)
181 return sizeof(struct nvme_dsm_range);
183 return blk_rq_bytes(rq);
186 static inline void nvme_cleanup_cmd(struct request *req)
188 if (req_op(req) == REQ_OP_DISCARD)
189 kfree(req->completion_data);
192 static inline int nvme_error_status(u16 status)
194 switch (status & 0x7ff) {
195 case NVME_SC_SUCCESS:
197 case NVME_SC_CAP_EXCEEDED:
204 static inline bool nvme_req_needs_retry(struct request *req, u16 status)
206 return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
207 (jiffies - req->start_time) < req->timeout;
210 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
211 enum nvme_ctrl_state new_state);
212 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
213 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
214 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
215 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
216 const struct nvme_ctrl_ops *ops, unsigned long quirks);
217 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
218 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
219 int nvme_init_identify(struct nvme_ctrl *ctrl);
221 void nvme_queue_scan(struct nvme_ctrl *ctrl);
222 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
224 #define NVME_NR_AERS 1
225 void nvme_complete_async_event(struct nvme_ctrl *ctrl,
226 struct nvme_completion *cqe);
227 void nvme_queue_async_events(struct nvme_ctrl *ctrl);
229 void nvme_stop_queues(struct nvme_ctrl *ctrl);
230 void nvme_start_queues(struct nvme_ctrl *ctrl);
231 void nvme_kill_queues(struct nvme_ctrl *ctrl);
233 struct request *nvme_alloc_request(struct request_queue *q,
234 struct nvme_command *cmd, unsigned int flags);
235 void nvme_requeue_req(struct request *req);
236 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
237 struct nvme_command *cmd);
238 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
239 void *buf, unsigned bufflen);
240 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
241 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
243 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
244 void __user *ubuffer, unsigned bufflen, u32 *result,
246 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
247 void __user *ubuffer, unsigned bufflen,
248 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
249 u32 *result, unsigned timeout);
250 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
251 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
252 struct nvme_id_ns **id);
253 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
254 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
255 dma_addr_t dma_addr, u32 *result);
256 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
257 dma_addr_t dma_addr, u32 *result);
258 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
262 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
263 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
264 int nvme_sg_get_version_num(int __user *ip);
267 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
268 int nvme_nvm_register(struct request_queue *q, char *disk_name);
269 void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
271 static inline int nvme_nvm_register(struct request_queue *q, char *disk_name)
276 static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
278 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
282 #endif /* CONFIG_NVM */
284 int __init nvme_core_init(void);
285 void nvme_core_exit(void);