1  /* SPDX-License-Identifier: GPL-2.0 */
2  #ifndef BLK_MQ_SCHED_H
3  #define BLK_MQ_SCHED_H
4  
5  #include "elevator.h"
6  #include "blk-mq.h"
7  
8  #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
9  
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);
18  
19  void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
20  
21  int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
22  void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
23  void blk_mq_sched_free_rqs(struct request_queue *q);
24  
blk_mq_sched_restart(struct blk_mq_hw_ctx * hctx)25  static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
26  {
27  	if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
28  		__blk_mq_sched_restart(hctx);
29  }
30  
bio_mergeable(struct bio * bio)31  static inline bool bio_mergeable(struct bio *bio)
32  {
33  	return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
34  }
35  
36  static inline bool
blk_mq_sched_allow_merge(struct request_queue * q,struct request * rq,struct bio * bio)37  blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
38  			 struct bio *bio)
39  {
40  	if (rq->rq_flags & RQF_USE_SCHED) {
41  		struct elevator_queue *e = q->elevator;
42  
43  		if (e->type->ops.allow_merge)
44  			return e->type->ops.allow_merge(q, rq, bio);
45  	}
46  	return true;
47  }
48  
blk_mq_sched_completed_request(struct request * rq,u64 now)49  static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
50  {
51  	if (rq->rq_flags & RQF_USE_SCHED) {
52  		struct elevator_queue *e = rq->q->elevator;
53  
54  		if (e->type->ops.completed_request)
55  			e->type->ops.completed_request(rq, now);
56  	}
57  }
58  
blk_mq_sched_requeue_request(struct request * rq)59  static inline void blk_mq_sched_requeue_request(struct request *rq)
60  {
61  	if (rq->rq_flags & RQF_USE_SCHED) {
62  		struct request_queue *q = rq->q;
63  		struct elevator_queue *e = q->elevator;
64  
65  		if (e->type->ops.requeue_request)
66  			e->type->ops.requeue_request(rq);
67  	}
68  }
69  
blk_mq_sched_has_work(struct blk_mq_hw_ctx * hctx)70  static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
71  {
72  	struct elevator_queue *e = hctx->queue->elevator;
73  
74  	if (e && e->type->ops.has_work)
75  		return e->type->ops.has_work(hctx);
76  
77  	return false;
78  }
79  
blk_mq_sched_needs_restart(struct blk_mq_hw_ctx * hctx)80  static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
81  {
82  	return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
83  }
84  
85  #endif
86