1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef BLK_MQ_SCHED_H
3 #define BLK_MQ_SCHED_H
4
5 #include "blk-mq.h"
6 #include "blk-mq-tag.h"
7
8 void blk_mq_sched_assign_ioc(struct request *rq);
9
10 void blk_mq_sched_request_inserted(struct request *rq);
11 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
12 unsigned int nr_segs, struct request **merged_request);
13 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
14 unsigned int nr_segs);
15 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
16 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
17 void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
18
19 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
20 bool run_queue, bool async);
21 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
22 struct blk_mq_ctx *ctx,
23 struct list_head *list, bool run_queue_async);
24
25 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
26
27 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
28 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
29 void blk_mq_sched_free_requests(struct request_queue *q);
30
31 static inline bool
blk_mq_sched_bio_merge(struct request_queue * q,struct bio * bio,unsigned int nr_segs)32 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
33 unsigned int nr_segs)
34 {
35 if (blk_queue_nomerges(q) || !bio_mergeable(bio))
36 return false;
37
38 return __blk_mq_sched_bio_merge(q, bio, nr_segs);
39 }
40
41 static inline bool
blk_mq_sched_allow_merge(struct request_queue * q,struct request * rq,struct bio * bio)42 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
43 struct bio *bio)
44 {
45 struct elevator_queue *e = q->elevator;
46
47 if (e && e->type->ops.allow_merge)
48 return e->type->ops.allow_merge(q, rq, bio);
49
50 return true;
51 }
52
blk_mq_sched_completed_request(struct request * rq,u64 now)53 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
54 {
55 struct elevator_queue *e = rq->q->elevator;
56
57 if (e && e->type->ops.completed_request)
58 e->type->ops.completed_request(rq, now);
59 }
60
blk_mq_sched_requeue_request(struct request * rq)61 static inline void blk_mq_sched_requeue_request(struct request *rq)
62 {
63 struct request_queue *q = rq->q;
64 struct elevator_queue *e = q->elevator;
65
66 if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
67 e->type->ops.requeue_request(rq);
68 }
69
blk_mq_sched_has_work(struct blk_mq_hw_ctx * hctx)70 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
71 {
72 struct elevator_queue *e = hctx->queue->elevator;
73
74 if (e && e->type->ops.has_work)
75 return e->type->ops.has_work(hctx);
76
77 return false;
78 }
79
blk_mq_sched_needs_restart(struct blk_mq_hw_ctx * hctx)80 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
81 {
82 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
83 }
84
85 #endif
86
