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_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
  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
  31 static inline bool bio_mergeable(struct bio *bio)
  32 {
  33         return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
  34 }
  35
  36 static inline bool
  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
  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
  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
  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
  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