block/blk-mq-sched.h

   1 #ifndef BLK_MQ_SCHED_H
   2 #define BLK_MQ_SCHED_H
   3
   4 #include "blk-mq.h"
   5 #include "blk-mq-tag.h"
   6
   7 void blk_mq_sched_free_hctx_data(struct request_queue *q,
   8                                  void (*exit)(struct blk_mq_hw_ctx *));
   9
  10 void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio);
  11
  12 void blk_mq_sched_request_inserted(struct request *rq);
  13 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  14                                 struct request **merged_request);
  15 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio);
  16 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  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, bool can_block);
  21 void blk_mq_sched_insert_requests(struct request_queue *q,
  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
  30 int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  31                            unsigned int hctx_idx);
  32 void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  33                             unsigned int hctx_idx);
  34
  35 int blk_mq_sched_init(struct request_queue *q);
  36
  37 static inline bool
  38 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
  39 {
  40         if (blk_queue_nomerges(q) || !bio_mergeable(bio))
  41                 return false;
  42
  43         return __blk_mq_sched_bio_merge(q, bio);
  44 }
  45
  46 static inline bool
  47 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  48                          struct bio *bio)
  49 {
  50         struct elevator_queue *e = q->elevator;
  51
  52         if (e && e->type->ops.mq.allow_merge)
  53                 return e->type->ops.mq.allow_merge(q, rq, bio);
  54
  55         return true;
  56 }
  57
  58 static inline void blk_mq_sched_completed_request(struct request *rq)
  59 {
  60         struct elevator_queue *e = rq->q->elevator;
  61
  62         if (e && e->type->ops.mq.completed_request)
  63                 e->type->ops.mq.completed_request(rq);
  64 }
  65
  66 static inline void blk_mq_sched_started_request(struct request *rq)
  67 {
  68         struct request_queue *q = rq->q;
  69         struct elevator_queue *e = q->elevator;
  70
  71         if (e && e->type->ops.mq.started_request)
  72                 e->type->ops.mq.started_request(rq);
  73 }
  74
  75 static inline void blk_mq_sched_requeue_request(struct request *rq)
  76 {
  77         struct request_queue *q = rq->q;
  78         struct elevator_queue *e = q->elevator;
  79
  80         if (e && e->type->ops.mq.requeue_request)
  81                 e->type->ops.mq.requeue_request(rq);
  82 }
  83
  84 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  85 {
  86         struct elevator_queue *e = hctx->queue->elevator;
  87
  88         if (e && e->type->ops.mq.has_work)
  89                 return e->type->ops.mq.has_work(hctx);
  90
  91         return false;
  92 }
  93
  94 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  95 {
  96         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  97 }
  98
  99 #endif