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