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 #define MAX_SCHED_RQ (16 * BLKDEV_MAX_RQ)
9
10 void blk_mq_sched_assign_ioc(struct request *rq);
11
12 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
13 unsigned int nr_segs, struct request **merged_request);
14 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
15 unsigned int nr_segs);
16 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
17 struct list_head *free);
18 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
19 void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
20
21 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
22 bool run_queue, bool async);
23 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
24 struct blk_mq_ctx *ctx,
25 struct list_head *list, bool run_queue_async);
26
27 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
28
29 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
30 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
31 void blk_mq_sched_free_requests(struct request_queue *q);
32
33 static inline bool
blk_mq_sched_bio_merge(struct request_queue * q,struct bio * bio,unsigned int nr_segs)34 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
35 unsigned int nr_segs)
36 {
37 if (blk_queue_nomerges(q) || !bio_mergeable(bio))
38 return false;
39
40 return __blk_mq_sched_bio_merge(q, bio, nr_segs);
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 struct elevator_queue *e = q->elevator;
48
49 if (e && e->type->ops.allow_merge)
50 return e->type->ops.allow_merge(q, rq, bio);
51
52 return true;
53 }
54
blk_mq_sched_completed_request(struct request * rq,u64 now)55 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
56 {
57 struct elevator_queue *e = rq->q->elevator;
58
59 if (e && e->type->ops.completed_request)
60 e->type->ops.completed_request(rq, now);
61 }
62
blk_mq_sched_requeue_request(struct request * rq)63 static inline void blk_mq_sched_requeue_request(struct request *rq)
64 {
65 struct request_queue *q = rq->q;
66 struct elevator_queue *e = q->elevator;
67
68 if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
69 e->type->ops.requeue_request(rq);
70 }
71
blk_mq_sched_has_work(struct blk_mq_hw_ctx * hctx)72 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
73 {
74 struct elevator_queue *e = hctx->queue->elevator;
75
76 if (e && e->type->ops.has_work)
77 return e->type->ops.has_work(hctx);
78
79 return false;
80 }
81
blk_mq_sched_needs_restart(struct blk_mq_hw_ctx * hctx)82 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
83 {
84 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
85 }
86
87 #endif
88
