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