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 struct request *blk_mq_sched_get_request(struct request_queue *q, struct bio *bio, unsigned int op, struct blk_mq_alloc_data *data);
  11 void blk_mq_sched_put_request(struct request *rq);
  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, bool can_block);
  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 int blk_mq_sched_init(struct request_queue *q);
  37
  38 static inline bool
  39 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
  40 {
  41         struct elevator_queue *e = q->elevator;
  42
  43         if (!e || blk_queue_nomerges(q) || !bio_mergeable(bio))
  44                 return false;
  45
  46         return __blk_mq_sched_bio_merge(q, bio);
  47 }
  48
  49 static inline int blk_mq_sched_get_rq_priv(struct request_queue *q,
  50                                            struct request *rq,
  51                                            struct bio *bio)
  52 {
  53         struct elevator_queue *e = q->elevator;
  54
  55         if (e && e->type->ops.mq.get_rq_priv)
  56                 return e->type->ops.mq.get_rq_priv(q, rq, bio);
  57
  58         return 0;
  59 }
  60
  61 static inline void blk_mq_sched_put_rq_priv(struct request_queue *q,
  62                                             struct request *rq)
  63 {
  64         struct elevator_queue *e = q->elevator;
  65
  66         if (e && e->type->ops.mq.put_rq_priv)
  67                 e->type->ops.mq.put_rq_priv(q, rq);
  68 }
  69
  70 static inline bool
  71 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  72                          struct bio *bio)
  73 {
  74         struct elevator_queue *e = q->elevator;
  75
  76         if (e && e->type->ops.mq.allow_merge)
  77                 return e->type->ops.mq.allow_merge(q, rq, bio);
  78
  79         return true;
  80 }
  81
  82 static inline void blk_mq_sched_completed_request(struct request *rq)
  83 {
  84         struct elevator_queue *e = rq->q->elevator;
  85
  86         if (e && e->type->ops.mq.completed_request)
  87                 e->type->ops.mq.completed_request(rq);
  88 }
  89
  90 static inline void blk_mq_sched_started_request(struct request *rq)
  91 {
  92         struct request_queue *q = rq->q;
  93         struct elevator_queue *e = q->elevator;
  94
  95         if (e && e->type->ops.mq.started_request)
  96                 e->type->ops.mq.started_request(rq);
  97 }
  98
  99 static inline void blk_mq_sched_requeue_request(struct request *rq)
 100 {
 101         struct request_queue *q = rq->q;
 102         struct elevator_queue *e = q->elevator;
 103
 104         if (e && e->type->ops.mq.requeue_request)
 105                 e->type->ops.mq.requeue_request(rq);
 106 }
 107
 108 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
 109 {
 110         struct elevator_queue *e = hctx->queue->elevator;
 111
 112         if (e && e->type->ops.mq.has_work)
 113                 return e->type->ops.mq.has_work(hctx);
 114
 115         return false;
 116 }
 117
 118 /*
 119  * Mark a hardware queue as needing a restart.
 120  */
 121 static inline void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx)
 122 {
 123         if (!test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
 124                 set_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 125 }
 126
 127 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
 128 {
 129         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 130 }
 131
 132 #endif