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_free_hctx_data(struct request_queue *q,
 9				 void (*exit)(struct blk_mq_hw_ctx *));
10
11void blk_mq_sched_assign_ioc(struct request *rq);
12
13void blk_mq_sched_request_inserted(struct request *rq);
14bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
15		unsigned int nr_segs, struct request **merged_request);
16bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
17		unsigned int nr_segs);
18bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
19void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
20void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
21
22void blk_mq_sched_insert_request(struct request *rq, bool at_head,
23				 bool run_queue, bool async);
24void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
25				  struct blk_mq_ctx *ctx,
26				  struct list_head *list, bool run_queue_async);
27
28void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
29
30int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
31void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
32void blk_mq_sched_free_requests(struct request_queue *q);
33
34static inline bool
35blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
36		unsigned int nr_segs)
37{
38	if (blk_queue_nomerges(q) || !bio_mergeable(bio))
39		return false;
40
41	return __blk_mq_sched_bio_merge(q, bio, nr_segs);
42}
43
44static inline bool
45blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
46			 struct bio *bio)
47{
48	struct elevator_queue *e = q->elevator;
49
50	if (e && e->type->ops.allow_merge)
51		return e->type->ops.allow_merge(q, rq, bio);
52
53	return true;
54}
55
56static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
57{
58	struct elevator_queue *e = rq->q->elevator;
59
60	if (e && e->type->ops.completed_request)
61		e->type->ops.completed_request(rq, now);
62}
63
64static inline void blk_mq_sched_requeue_request(struct request *rq)
65{
66	struct request_queue *q = rq->q;
67	struct elevator_queue *e = q->elevator;
68
69	if (e && e->type->ops.requeue_request)
70		e->type->ops.requeue_request(rq);
71}
72
73static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
74{
75	struct elevator_queue *e = hctx->queue->elevator;
76
77	if (e && e->type->ops.has_work)
78		return e->type->ops.has_work(hctx);
79
80	return false;
81}
82
83static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
84{
85	return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
86}
87
88#endif