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 #include "blk-mq-tag.h" 8 9 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ) 10 11 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio, 12 unsigned int nr_segs, struct request **merged_request); 13 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio, 14 unsigned int nr_segs); 15 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq, 16 struct list_head *free); 17 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx); 18 void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx); 19 20 void blk_mq_sched_insert_request(struct request *rq, bool at_head, 21 bool run_queue, bool async); 22 void 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 26 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx); 27 28 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e); 29 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e); 30 void blk_mq_sched_free_rqs(struct request_queue *q); 31 32 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx) 33 { 34 if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state)) 35 __blk_mq_sched_restart(hctx); 36 } 37 38 static inline bool bio_mergeable(struct bio *bio) 39 { 40 return !(bio->bi_opf & REQ_NOMERGE_FLAGS); 41 } 42 43 static inline bool 44 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq, 45 struct bio *bio) 46 { 47 if (rq->rq_flags & RQF_ELV) { 48 struct elevator_queue *e = q->elevator; 49 50 if (e->type->ops.allow_merge) 51 return e->type->ops.allow_merge(q, rq, bio); 52 } 53 return true; 54 } 55 56 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now) 57 { 58 if (rq->rq_flags & RQF_ELV) { 59 struct elevator_queue *e = rq->q->elevator; 60 61 if (e->type->ops.completed_request) 62 e->type->ops.completed_request(rq, now); 63 } 64 } 65 66 static inline void blk_mq_sched_requeue_request(struct request *rq) 67 { 68 if (rq->rq_flags & RQF_ELV) { 69 struct request_queue *q = rq->q; 70 struct elevator_queue *e = q->elevator; 71 72 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request) 73 e->type->ops.requeue_request(rq); 74 } 75 } 76 77 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx) 78 { 79 struct elevator_queue *e = hctx->queue->elevator; 80 81 if (e && e->type->ops.has_work) 82 return e->type->ops.has_work(hctx); 83 84 return false; 85 } 86 87 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx) 88 { 89 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state); 90 } 91 92 #endif 93