1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include "blk-mq-tag.h"
8 #define MAX_SCHED_RQ (16 * BLKDEV_MAX_RQ)
10 void blk_mq_sched_assign_ioc(struct request *rq);
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);
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);
27 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
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);
34 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
37 if (blk_queue_nomerges(q) || !bio_mergeable(bio))
40 return __blk_mq_sched_bio_merge(q, bio, nr_segs);
44 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
47 struct elevator_queue *e = q->elevator;
49 if (e && e->type->ops.allow_merge)
50 return e->type->ops.allow_merge(q, rq, bio);
55 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
57 struct elevator_queue *e = rq->q->elevator;
59 if (e && e->type->ops.completed_request)
60 e->type->ops.completed_request(rq, now);
63 static inline void blk_mq_sched_requeue_request(struct request *rq)
65 struct request_queue *q = rq->q;
66 struct elevator_queue *e = q->elevator;
68 if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
69 e->type->ops.requeue_request(rq);
72 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
74 struct elevator_queue *e = hctx->queue->elevator;
76 if (e && e->type->ops.has_work)
77 return e->type->ops.has_work(hctx);
82 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
84 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);