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/cdev.h>
19 #include <linux/pci.h>
20 #include <linux/kref.h>
21 #include <linux/blk-mq.h>
22 #include <linux/lightnvm.h>
23 #include <linux/sed-opal.h>
25 extern unsigned int nvme_io_timeout;
26 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
28 extern unsigned int admin_timeout;
29 #define ADMIN_TIMEOUT (admin_timeout * HZ)
31 #define NVME_DEFAULT_KATO 5
32 #define NVME_KATO_GRACE 10
34 extern struct workqueue_struct *nvme_wq;
42 * List of workarounds for devices that required behavior not specified in
47 * Prefers I/O aligned to a stripe size specified in a vendor
48 * specific Identify field.
50 NVME_QUIRK_STRIPE_SIZE = (1 << 0),
53 * The controller doesn't handle Identify value others than 0 or 1
56 NVME_QUIRK_IDENTIFY_CNS = (1 << 1),
59 * The controller deterministically returns O's on reads to
60 * logical blocks that deallocate was called on.
62 NVME_QUIRK_DEALLOCATE_ZEROES = (1 << 2),
65 * The controller needs a delay before starts checking the device
66 * readiness, which is done by reading the NVME_CSTS_RDY bit.
68 NVME_QUIRK_DELAY_BEFORE_CHK_RDY = (1 << 3),
71 * APST should not be used.
73 NVME_QUIRK_NO_APST = (1 << 4),
76 * The deepest sleep state should not be used.
78 NVME_QUIRK_NO_DEEPEST_PS = (1 << 5),
81 * Supports the LighNVM command set if indicated in vs[1].
83 NVME_QUIRK_LIGHTNVM = (1 << 6),
87 * Common request structure for NVMe passthrough. All drivers must have
88 * this structure as the first member of their request-private data.
91 struct nvme_command *cmd;
92 union nvme_result result;
99 NVME_REQ_CANCELLED = (1 << 0),
102 static inline struct nvme_request *nvme_req(struct request *req)
104 return blk_mq_rq_to_pdu(req);
107 /* The below value is the specific amount of delay needed before checking
108 * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
109 * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
112 #define NVME_QUIRK_DELAY_AMOUNT 2000
114 enum nvme_ctrl_state {
118 NVME_CTRL_RECONNECTING,
124 enum nvme_ctrl_state state;
127 const struct nvme_ctrl_ops *ops;
128 struct request_queue *admin_q;
129 struct request_queue *connect_q;
132 struct blk_mq_tag_set *tagset;
133 struct blk_mq_tag_set *admin_tagset;
134 struct list_head namespaces;
135 struct mutex namespaces_mutex;
136 struct device ctrl_device;
137 struct device *device; /* char device */
140 struct work_struct reset_work;
141 struct work_struct delete_work;
143 struct opal_dev *opal_dev;
148 char firmware_rev[8];
149 char subnqn[NVMF_NQN_SIZE];
164 atomic_t abort_limit;
172 unsigned int shutdown_timeout;
175 unsigned long quirks;
176 struct nvme_id_power_state psd[32];
177 struct nvme_effects_log *effects;
178 struct work_struct scan_work;
179 struct work_struct async_event_work;
180 struct delayed_work ka_work;
181 struct work_struct fw_act_work;
183 /* Power saving configuration */
184 u64 ps_max_latency_us;
200 struct nvmf_ctrl_options *opts;
204 struct list_head list;
206 struct nvme_ctrl *ctrl;
207 struct request_queue *queue;
208 struct gendisk *disk;
209 struct nvm_dev *ndev;
225 #define NVME_NS_REMOVING 0
226 #define NVME_NS_DEAD 1
230 struct nvme_ctrl_ops {
232 struct module *module;
234 #define NVME_F_FABRICS (1 << 0)
235 #define NVME_F_METADATA_SUPPORTED (1 << 1)
236 int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
237 int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
238 int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
239 void (*free_ctrl)(struct nvme_ctrl *ctrl);
240 void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
241 void (*delete_ctrl)(struct nvme_ctrl *ctrl);
242 int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
243 int (*reinit_request)(void *data, struct request *rq);
246 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
250 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
252 return val & NVME_CSTS_RDY;
255 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
257 if (!ctrl->subsystem)
259 return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
262 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
264 return (sector >> (ns->lba_shift - 9));
267 static inline void nvme_cleanup_cmd(struct request *req)
269 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
270 kfree(page_address(req->special_vec.bv_page) +
271 req->special_vec.bv_offset);
275 static inline void nvme_end_request(struct request *req, __le16 status,
276 union nvme_result result)
278 struct nvme_request *rq = nvme_req(req);
280 rq->status = le16_to_cpu(status) >> 1;
282 blk_mq_complete_request(req);
285 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
287 get_device(ctrl->device);
290 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
292 put_device(ctrl->device);
295 void nvme_complete_rq(struct request *req);
296 void nvme_cancel_request(struct request *req, void *data, bool reserved);
297 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
298 enum nvme_ctrl_state new_state);
299 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
300 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
301 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
302 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
303 const struct nvme_ctrl_ops *ops, unsigned long quirks);
304 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
305 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
306 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
307 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
308 int nvme_init_identify(struct nvme_ctrl *ctrl);
310 void nvme_queue_scan(struct nvme_ctrl *ctrl);
311 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
313 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
316 #define NVME_NR_AERS 1
317 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
318 union nvme_result *res);
319 void nvme_queue_async_events(struct nvme_ctrl *ctrl);
321 void nvme_stop_queues(struct nvme_ctrl *ctrl);
322 void nvme_start_queues(struct nvme_ctrl *ctrl);
323 void nvme_kill_queues(struct nvme_ctrl *ctrl);
324 void nvme_unfreeze(struct nvme_ctrl *ctrl);
325 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
326 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
327 void nvme_start_freeze(struct nvme_ctrl *ctrl);
328 int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set);
330 #define NVME_QID_ANY -1
331 struct request *nvme_alloc_request(struct request_queue *q,
332 struct nvme_command *cmd, unsigned int flags, int qid);
333 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
334 struct nvme_command *cmd);
335 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
336 void *buf, unsigned bufflen);
337 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
338 union nvme_result *result, void *buffer, unsigned bufflen,
339 unsigned timeout, int qid, int at_head, int flags);
340 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
341 void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
342 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
343 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
344 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
345 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
348 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
349 void nvme_nvm_unregister(struct nvme_ns *ns);
350 int nvme_nvm_register_sysfs(struct nvme_ns *ns);
351 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
352 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
354 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
360 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
361 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
365 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
366 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
371 #endif /* CONFIG_NVM */
373 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
375 return dev_to_disk(dev)->private_data;
378 int __init nvme_core_init(void);
379 void nvme_core_exit(void);