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
10void blk_mq_sched_assign_ioc(struct request *rq);
11
12bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
13		unsigned int nr_segs, struct request **merged_request);
14bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
15		unsigned int nr_segs);
16bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
17				   struct list_head *free);
18void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
19void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
20
21void blk_mq_sched_insert_request(struct request *rq, bool at_head,
22				 bool run_queue, bool async);
23void 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
27void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
28
29int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
30void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
31void blk_mq_sched_free_requests(struct request_queue *q);
32
33static inline bool
34blk_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
43static inline bool
44blk_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
55static 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
63static 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
72static 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
82static 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