4 #include <linux/blkdev.h>
5 #include <linux/sbitmap.h>
6 #include <linux/srcu.h>
9 struct blk_flush_queue;
11 struct blk_mq_hw_ctx {
14 struct list_head dispatch;
15 unsigned long state; /* BLK_MQ_S_* flags */
16 } ____cacheline_aligned_in_smp;
18 struct delayed_work run_work;
19 cpumask_var_t cpumask;
23 unsigned long flags; /* BLK_MQ_F_* flags */
26 struct request_queue *queue;
27 struct blk_flush_queue *fq;
31 struct sbitmap ctx_map;
33 struct blk_mq_ctx **ctxs;
36 wait_queue_t dispatch_wait;
39 struct blk_mq_tags *tags;
40 struct blk_mq_tags *sched_tags;
42 struct srcu_struct queue_rq_srcu;
46 #define BLK_MQ_MAX_DISPATCH_ORDER 7
47 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
49 unsigned int numa_node;
50 unsigned int queue_num;
54 struct hlist_node cpuhp_dead;
57 unsigned long poll_considered;
58 unsigned long poll_invoked;
59 unsigned long poll_success;
61 #ifdef CONFIG_BLK_DEBUG_FS
62 struct dentry *debugfs_dir;
63 struct dentry *sched_debugfs_dir;
67 struct blk_mq_tag_set {
69 const struct blk_mq_ops *ops;
70 unsigned int nr_hw_queues;
71 unsigned int queue_depth; /* max hw supported */
72 unsigned int reserved_tags;
73 unsigned int cmd_size; /* per-request extra data */
76 unsigned int flags; /* BLK_MQ_F_* */
79 struct blk_mq_tags **tags;
81 struct mutex tag_list_lock;
82 struct list_head tag_list;
85 struct blk_mq_queue_data {
90 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
91 typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
92 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
93 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
94 typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
95 unsigned int, unsigned int);
96 typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
98 typedef int (reinit_request_fn)(void *, struct request *);
100 typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
102 typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
103 typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
104 typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
111 queue_rq_fn *queue_rq;
114 * Called on request timeout
119 * Called to poll for completion of a specific tag.
123 softirq_done_fn *complete;
126 * Called when the block layer side of a hardware queue has been
127 * set up, allowing the driver to allocate/init matching structures.
128 * Ditto for exit/teardown.
130 init_hctx_fn *init_hctx;
131 exit_hctx_fn *exit_hctx;
134 * Called for every command allocated by the block layer to allow
135 * the driver to set up driver specific data.
137 * Tag greater than or equal to queue_depth is for setting up
140 * Ditto for exit/teardown.
142 init_request_fn *init_request;
143 exit_request_fn *exit_request;
144 reinit_request_fn *reinit_request;
146 map_queues_fn *map_queues;
148 #ifdef CONFIG_BLK_DEBUG_FS
150 * Used by the debugfs implementation to show driver-specific
151 * information about a request.
153 void (*show_rq)(struct seq_file *m, struct request *rq);
158 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
159 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
160 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
162 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
163 BLK_MQ_F_TAG_SHARED = 1 << 1,
164 BLK_MQ_F_SG_MERGE = 1 << 2,
165 BLK_MQ_F_BLOCKING = 1 << 5,
166 BLK_MQ_F_NO_SCHED = 1 << 6,
167 BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
168 BLK_MQ_F_ALLOC_POLICY_BITS = 1,
170 BLK_MQ_S_STOPPED = 0,
171 BLK_MQ_S_TAG_ACTIVE = 1,
172 BLK_MQ_S_SCHED_RESTART = 2,
173 BLK_MQ_S_TAG_WAITING = 3,
174 BLK_MQ_S_START_ON_RUN = 4,
176 BLK_MQ_MAX_DEPTH = 10240,
178 BLK_MQ_CPU_WORK_BATCH = 8,
180 #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
181 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
182 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
183 #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
184 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
185 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
187 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
188 struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
189 struct request_queue *q);
190 int blk_mq_register_dev(struct device *, struct request_queue *);
191 void blk_mq_unregister_dev(struct device *, struct request_queue *);
193 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
194 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
196 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
198 void blk_mq_free_request(struct request *rq);
199 bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
202 BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
203 BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
204 BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
207 struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
209 struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op,
210 unsigned int flags, unsigned int hctx_idx);
211 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
214 BLK_MQ_UNIQUE_TAG_BITS = 16,
215 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
218 u32 blk_mq_unique_tag(struct request *rq);
220 static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
222 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
225 static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
227 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
231 int blk_mq_request_started(struct request *rq);
232 void blk_mq_start_request(struct request *rq);
233 void blk_mq_end_request(struct request *rq, int error);
234 void __blk_mq_end_request(struct request *rq, int error);
236 void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
237 void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
238 bool kick_requeue_list);
239 void blk_mq_kick_requeue_list(struct request_queue *q);
240 void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
241 void blk_mq_complete_request(struct request *rq);
243 bool blk_mq_queue_stopped(struct request_queue *q);
244 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
245 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
246 void blk_mq_stop_hw_queues(struct request_queue *q);
247 void blk_mq_start_hw_queues(struct request_queue *q);
248 void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
249 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
250 void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
251 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
252 void blk_mq_run_hw_queues(struct request_queue *q, bool async);
253 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
254 void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
255 busy_tag_iter_fn *fn, void *priv);
256 void blk_mq_freeze_queue(struct request_queue *q);
257 void blk_mq_unfreeze_queue(struct request_queue *q);
258 void blk_freeze_queue_start(struct request_queue *q);
259 void blk_mq_freeze_queue_wait(struct request_queue *q);
260 int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
261 unsigned long timeout);
262 int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
264 int blk_mq_map_queues(struct blk_mq_tag_set *set);
265 void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
268 * Driver command data is immediately after the request. So subtract request
269 * size to get back to the original request, add request size to get the PDU.
271 static inline struct request *blk_mq_rq_from_pdu(void *pdu)
273 return pdu - sizeof(struct request);
275 static inline void *blk_mq_rq_to_pdu(struct request *rq)
280 #define queue_for_each_hw_ctx(q, hctx, i) \
281 for ((i) = 0; (i) < (q)->nr_hw_queues && \
282 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
284 #define hctx_for_each_ctx(hctx, ctx, i) \
285 for ((i) = 0; (i) < (hctx)->nr_ctx && \
286 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)