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 void blk_mq_sched_assign_ioc(struct request *rq); 12 13 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio, 14 unsigned int nr_segs, struct request **merged_request); 15 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio, 16 unsigned int nr_segs); 17 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq, 18 struct list_head *free); 19 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx); 20 void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx); 21 22 void blk_mq_sched_insert_request(struct request *rq, bool at_head, 23 bool run_queue, bool async); 24 void 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 28 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx); 29 30 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e); 31 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e); 32 void blk_mq_sched_free_rqs(struct request_queue *q); 33 34 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx) 35 { 36 if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state)) 37 __blk_mq_sched_restart(hctx); 38 } 39 40 static inline bool bio_mergeable(struct bio *bio) 41 { 42 return !(bio->bi_opf & REQ_NOMERGE_FLAGS); 43 } 44 45 static inline bool 46 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq, 47 struct bio *bio) 48 { 49 if (rq->rq_flags & RQF_ELV) { 50 struct elevator_queue *e = q->elevator; 51 52 if (e->type->ops.allow_merge) 53 return e->type->ops.allow_merge(q, rq, bio); 54 } 55 return true; 56 } 57 58 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now) 59 { 60 if (rq->rq_flags & RQF_ELV) { 61 struct elevator_queue *e = rq->q->elevator; 62 63 if (e->type->ops.completed_request) 64 e->type->ops.completed_request(rq, now); 65 } 66 } 67 68 static inline void blk_mq_sched_requeue_request(struct request *rq) 69 { 70 if (rq->rq_flags & RQF_ELV) { 71 struct request_queue *q = rq->q; 72 struct elevator_queue *e = q->elevator; 73 74 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request) 75 e->type->ops.requeue_request(rq); 76 } 77 } 78 79 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx) 80 { 81 struct elevator_queue *e = hctx->queue->elevator; 82 83 if (e && e->type->ops.has_work) 84 return e->type->ops.has_work(hctx); 85 86 return false; 87 } 88 89 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx) 90 { 91 return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state); 92 } 93 94 #endif 95