1
2#ifndef BLK_MQ_SCHED_H
3#define BLK_MQ_SCHED_H
4
5#include "elevator.h"
6#include "blk-mq.h"
7
8#define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_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,
15 struct list_head *free);
16void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
17void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
18
19void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
20
21int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
22void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
23void blk_mq_sched_free_rqs(struct request_queue *q);
24
25static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
26{
27 if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
28 __blk_mq_sched_restart(hctx);
29}
30
31static inline bool bio_mergeable(struct bio *bio)
32{
33 return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
34}
35
36static inline bool
37blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
38 struct bio *bio)
39{
40 if (rq->rq_flags & RQF_USE_SCHED) {
41 struct elevator_queue *e = q->elevator;
42
43 if (e->type->ops.allow_merge)
44 return e->type->ops.allow_merge(q, rq, bio);
45 }
46 return true;
47}
48
49static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
50{
51 if (rq->rq_flags & RQF_USE_SCHED) {
52 struct elevator_queue *e = rq->q->elevator;
53
54 if (e->type->ops.completed_request)
55 e->type->ops.completed_request(rq, now);
56 }
57}
58
59static inline void blk_mq_sched_requeue_request(struct request *rq)
60{
61 if (rq->rq_flags & RQF_USE_SCHED) {
62 struct request_queue *q = rq->q;
63 struct elevator_queue *e = q->elevator;
64
65 if (e->type->ops.requeue_request)
66 e->type->ops.requeue_request(rq);
67 }
68}
69
70static 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
80static 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
