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 #include "blk-mq-tag.h"
8
9 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
10
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 struct list_head *free);
17 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
18 void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
19
20 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
21 bool run_queue, bool async);
22 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
23 struct blk_mq_ctx *ctx,
24 struct list_head *list, bool run_queue_async);
25
26 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
27
28 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
29 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
30 void blk_mq_sched_free_rqs(struct request_queue *q);
31
blk_mq_sched_restart(struct blk_mq_hw_ctx * hctx)32 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
33 {
34 if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
35 __blk_mq_sched_restart(hctx);
36 }
37
bio_mergeable(struct bio * bio)38 static inline bool bio_mergeable(struct bio *bio)
39 {
40 return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
41 }
42
43 static inline bool
blk_mq_sched_allow_merge(struct request_queue * q,struct request * rq,struct bio * bio)44 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
45 struct bio *bio)
46 {
47 if (rq->rq_flags & RQF_ELV) {
48 struct elevator_queue *e = q->elevator;
49
50 if (e->type->ops.allow_merge)
51 return e->type->ops.allow_merge(q, rq, bio);
52 }
53 return true;
54 }
55
blk_mq_sched_completed_request(struct request * rq,u64 now)56 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
57 {
58 if (rq->rq_flags & RQF_ELV) {
59 struct elevator_queue *e = rq->q->elevator;
60
61 if (e->type->ops.completed_request)
62 e->type->ops.completed_request(rq, now);
63 }
64 }
65
blk_mq_sched_requeue_request(struct request * rq)66 static inline void blk_mq_sched_requeue_request(struct request *rq)
67 {
68 if (rq->rq_flags & RQF_ELV) {
69 struct request_queue *q = rq->q;
70 struct elevator_queue *e = q->elevator;
71
72 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
73 e->type->ops.requeue_request(rq);
74 }
75 }
76
blk_mq_sched_has_work(struct blk_mq_hw_ctx * hctx)77 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
78 {
79 struct elevator_queue *e = hctx->queue->elevator;
80
81 if (e && e->type->ops.has_work)
82 return e->type->ops.has_work(hctx);
83
84 return false;
85 }
86
blk_mq_sched_needs_restart(struct blk_mq_hw_ctx * hctx)87 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
88 {
89 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
90 }
91
92 #endif
93