1 /* SPDX-License-Identifier: GPL-2.0 */
8 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
10 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
11 unsigned int nr_segs, struct request **merged_request);
12 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
13 unsigned int nr_segs);
14 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
15 struct list_head *free);
16 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
17 void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
19 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
20 bool run_queue, bool async);
22 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
24 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
25 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
26 void blk_mq_sched_free_rqs(struct request_queue *q);
28 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
30 if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
31 __blk_mq_sched_restart(hctx);
34 static inline bool bio_mergeable(struct bio *bio)
36 return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
40 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
43 if (rq->rq_flags & RQF_ELV) {
44 struct elevator_queue *e = q->elevator;
46 if (e->type->ops.allow_merge)
47 return e->type->ops.allow_merge(q, rq, bio);
52 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
54 if (rq->rq_flags & RQF_ELV) {
55 struct elevator_queue *e = rq->q->elevator;
57 if (e->type->ops.completed_request)
58 e->type->ops.completed_request(rq, now);
62 static inline void blk_mq_sched_requeue_request(struct request *rq)
64 if (rq->rq_flags & RQF_ELV) {
65 struct request_queue *q = rq->q;
66 struct elevator_queue *e = q->elevator;
68 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
69 e->type->ops.requeue_request(rq);
73 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
75 struct elevator_queue *e = hctx->queue->elevator;
77 if (e && e->type->ops.has_work)
78 return e->type->ops.has_work(hctx);
83 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
85 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);