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 "blk-mq.h"
   6 #include "blk-mq-tag.h"
   7
   8 void blk_mq_sched_free_hctx_data(struct request_queue *q,
   9                                  void (*exit)(struct blk_mq_hw_ctx *));
  10
  11 void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio);
  12
  13 void blk_mq_sched_request_inserted(struct request *rq);
  14 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  15                                 struct request **merged_request);
  16 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio);
  17 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  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 request_queue *q,
  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
  31 int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  32                            unsigned int hctx_idx);
  33 void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  34                             unsigned int hctx_idx);
  35
  36 static inline bool
  37 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
  38 {
  39         if (blk_queue_nomerges(q) || !bio_mergeable(bio))
  40                 return false;
  41
  42         return __blk_mq_sched_bio_merge(q, bio);
  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         struct elevator_queue *e = q->elevator;
  50
  51         if (e && e->type->ops.mq.allow_merge)
  52                 return e->type->ops.mq.allow_merge(q, rq, bio);
  53
  54         return true;
  55 }
  56
  57 static inline void blk_mq_sched_completed_request(struct request *rq)
  58 {
  59         struct elevator_queue *e = rq->q->elevator;
  60
  61         if (e && e->type->ops.mq.completed_request)
  62                 e->type->ops.mq.completed_request(rq);
  63 }
  64
  65 static inline void blk_mq_sched_started_request(struct request *rq)
  66 {
  67         struct request_queue *q = rq->q;
  68         struct elevator_queue *e = q->elevator;
  69
  70         if (e && e->type->ops.mq.started_request)
  71                 e->type->ops.mq.started_request(rq);
  72 }
  73
  74 static inline void blk_mq_sched_requeue_request(struct request *rq)
  75 {
  76         struct request_queue *q = rq->q;
  77         struct elevator_queue *e = q->elevator;
  78
  79         if (e && e->type->ops.mq.requeue_request)
  80                 e->type->ops.mq.requeue_request(rq);
  81 }
  82
  83 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  84 {
  85         struct elevator_queue *e = hctx->queue->elevator;
  86
  87         if (e && e->type->ops.mq.has_work)
  88                 return e->type->ops.mq.has_work(hctx);
  89
  90         return false;
  91 }
  92
  93 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  94 {
  95         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  96 }
  97
  98 #endif