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 work_struct 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 delayed_work delay_work;
56 struct hlist_node cpuhp_dead;
59 unsigned long poll_considered;
60 unsigned long poll_invoked;
61 unsigned long poll_success;
64 struct blk_mq_tag_set {
66 const struct blk_mq_ops *ops;
67 unsigned int nr_hw_queues;
68 unsigned int queue_depth; /* max hw supported */
69 unsigned int reserved_tags;
70 unsigned int cmd_size; /* per-request extra data */
73 unsigned int flags; /* BLK_MQ_F_* */
76 struct blk_mq_tags **tags;
78 struct mutex tag_list_lock;
79 struct list_head tag_list;
82 struct blk_mq_queue_data {
84 struct list_head *list;
88 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
89 typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
90 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
91 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
92 typedef int (init_request_fn)(void *, struct request *, unsigned int,
93 unsigned int, unsigned int);
94 typedef void (exit_request_fn)(void *, struct request *, unsigned int,
96 typedef int (reinit_request_fn)(void *, struct request *);
98 typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
100 typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
101 typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
102 typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
109 queue_rq_fn *queue_rq;
112 * Called on request timeout
117 * Called to poll for completion of a specific tag.
121 softirq_done_fn *complete;
124 * Called when the block layer side of a hardware queue has been
125 * set up, allowing the driver to allocate/init matching structures.
126 * Ditto for exit/teardown.
128 init_hctx_fn *init_hctx;
129 exit_hctx_fn *exit_hctx;
132 * Called for every command allocated by the block layer to allow
133 * the driver to set up driver specific data.
135 * Tag greater than or equal to queue_depth is for setting up
138 * Ditto for exit/teardown.
140 init_request_fn *init_request;
141 exit_request_fn *exit_request;
142 reinit_request_fn *reinit_request;
144 map_queues_fn *map_queues;
148 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
149 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
150 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
152 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
153 BLK_MQ_F_TAG_SHARED = 1 << 1,
154 BLK_MQ_F_SG_MERGE = 1 << 2,
155 BLK_MQ_F_DEFER_ISSUE = 1 << 4,
156 BLK_MQ_F_BLOCKING = 1 << 5,
157 BLK_MQ_F_NO_SCHED = 1 << 6,
158 BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
159 BLK_MQ_F_ALLOC_POLICY_BITS = 1,
161 BLK_MQ_S_STOPPED = 0,
162 BLK_MQ_S_TAG_ACTIVE = 1,
163 BLK_MQ_S_SCHED_RESTART = 2,
164 BLK_MQ_S_TAG_WAITING = 3,
166 BLK_MQ_MAX_DEPTH = 10240,
168 BLK_MQ_CPU_WORK_BATCH = 8,
170 #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
171 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
172 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
173 #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
174 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
175 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
177 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
178 struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
179 struct request_queue *q);
180 int blk_mq_register_dev(struct device *, struct request_queue *);
181 void blk_mq_unregister_dev(struct device *, struct request_queue *);
183 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
184 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
186 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
188 void blk_mq_free_request(struct request *rq);
189 bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
192 BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
193 BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
194 BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
197 struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
199 struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op,
200 unsigned int flags, unsigned int hctx_idx);
201 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
204 BLK_MQ_UNIQUE_TAG_BITS = 16,
205 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
208 u32 blk_mq_unique_tag(struct request *rq);
210 static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
212 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
215 static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
217 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
221 int blk_mq_request_started(struct request *rq);
222 void blk_mq_start_request(struct request *rq);
223 void blk_mq_end_request(struct request *rq, int error);
224 void __blk_mq_end_request(struct request *rq, int error);
226 void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
227 void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
228 bool kick_requeue_list);
229 void blk_mq_kick_requeue_list(struct request_queue *q);
230 void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
231 void blk_mq_abort_requeue_list(struct request_queue *q);
232 void blk_mq_complete_request(struct request *rq, int error);
234 bool blk_mq_queue_stopped(struct request_queue *q);
235 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
236 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
237 void blk_mq_stop_hw_queues(struct request_queue *q);
238 void blk_mq_start_hw_queues(struct request_queue *q);
239 void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
240 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
241 void blk_mq_run_hw_queues(struct request_queue *q, bool async);
242 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
243 void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
244 busy_tag_iter_fn *fn, void *priv);
245 void blk_mq_freeze_queue(struct request_queue *q);
246 void blk_mq_unfreeze_queue(struct request_queue *q);
247 void blk_mq_freeze_queue_start(struct request_queue *q);
248 int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
250 int blk_mq_map_queues(struct blk_mq_tag_set *set);
251 void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
254 * Driver command data is immediately after the request. So subtract request
255 * size to get back to the original request, add request size to get the PDU.
257 static inline struct request *blk_mq_rq_from_pdu(void *pdu)
259 return pdu - sizeof(struct request);
261 static inline void *blk_mq_rq_to_pdu(struct request *rq)
266 #define queue_for_each_hw_ctx(q, hctx, i) \
267 for ((i) = 0; (i) < (q)->nr_hw_queues && \
268 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
270 #define hctx_for_each_ctx(hctx, ctx, i) \
271 for ((i) = 0; (i) < (hctx)->nr_ctx && \
272 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)