block/blk-mq-sched.h

   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_insert_request(struct request *rq, bool at_head,
  20                                  bool run_queue, bool async);
  21 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
  22                                   struct blk_mq_ctx *ctx,
  23                                   struct list_head *list, bool run_queue_async);
  24
  25 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  26
  27 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
  28 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
  29 void blk_mq_sched_free_rqs(struct request_queue *q);
  30
  31 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
  32 {
  33         if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
  34                 __blk_mq_sched_restart(hctx);
  35 }
  36
  37 static inline bool bio_mergeable(struct bio *bio)
  38 {
  39         return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
  40 }
  41
  42 static inline bool
  43 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  44                          struct bio *bio)
  45 {
  46         if (rq->rq_flags & RQF_ELV) {
  47                 struct elevator_queue *e = q->elevator;
  48
  49                 if (e->type->ops.allow_merge)
  50                         return e->type->ops.allow_merge(q, rq, bio);
  51         }
  52         return true;
  53 }
  54
  55 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  56 {
  57         if (rq->rq_flags & RQF_ELV) {
  58                 struct elevator_queue *e = rq->q->elevator;
  59
  60                 if (e->type->ops.completed_request)
  61                         e->type->ops.completed_request(rq, now);
  62         }
  63 }
  64
  65 static inline void blk_mq_sched_requeue_request(struct request *rq)
  66 {
  67         if (rq->rq_flags & RQF_ELV) {
  68                 struct request_queue *q = rq->q;
  69                 struct elevator_queue *e = q->elevator;
  70
  71                 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
  72                         e->type->ops.requeue_request(rq);
  73         }
  74 }
  75
  76 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  77 {
  78         struct elevator_queue *e = hctx->queue->elevator;
  79
  80         if (e && e->type->ops.has_work)
  81                 return e->type->ops.has_work(hctx);
  82
  83         return false;
  84 }
  85
  86 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  87 {
  88         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  89 }
  90
  91 #endif