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
8void blk_mq_sched_assign_ioc(struct request *rq);
9
10void blk_mq_sched_request_inserted(struct request *rq);
11bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
12		unsigned int nr_segs, struct request **merged_request);
13bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
14		unsigned int nr_segs);
15bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
16				   struct list_head *free);
17void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
18void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
19
20void blk_mq_sched_insert_request(struct request *rq, bool at_head,
21				 bool run_queue, bool async);
22void 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
26void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
27
28int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
29void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
30void blk_mq_sched_free_requests(struct request_queue *q);
31
32static inline bool
33blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
34		unsigned int nr_segs)
35{
36	if (blk_queue_nomerges(q) || !bio_mergeable(bio))
37		return false;
38
39	return __blk_mq_sched_bio_merge(q, bio, nr_segs);
40}
41
42static inline bool
43blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
44			 struct bio *bio)
45{
46	struct elevator_queue *e = q->elevator;
47
48	if (e && e->type->ops.allow_merge)
49		return e->type->ops.allow_merge(q, rq, bio);
50
51	return true;
52}
53
54static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
55{
56	struct elevator_queue *e = rq->q->elevator;
57
58	if (e && e->type->ops.completed_request)
59		e->type->ops.completed_request(rq, now);
60}
61
62static inline void blk_mq_sched_requeue_request(struct request *rq)
63{
64	struct request_queue *q = rq->q;
65	struct elevator_queue *e = q->elevator;
66
67	if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
68		e->type->ops.requeue_request(rq);
69}
70
71static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
72{
73	struct elevator_queue *e = hctx->queue->elevator;
74
75	if (e && e->type->ops.has_work)
76		return e->type->ops.has_work(hctx);
77
78	return false;
79}
80
81static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
82{
83	return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
84}
85
86#endif
87