1 /* SPDX-License-Identifier: GPL-2.0 */
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
10 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
11 unsigned int nr_segs, struct request **merged_request);
12 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
13 unsigned int nr_segs);
14 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
15 struct list_head *free);
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_dispatch_requests(struct blk_mq_hw_ctx *hctx);
20
21 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
22 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
23 void blk_mq_sched_free_rqs(struct request_queue *q);
24
25 static 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
31 static inline bool bio_mergeable(struct bio *bio)
32 {
33 return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
34 }
35
36 static inline bool
37 blk_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
49 static 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
59 static 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
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
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
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