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 int blk_mq_sched_init_hctx_data(struct request_queue *q, size_t size,
   8                                 int (*init)(struct blk_mq_hw_ctx *),
   9                                 void (*exit)(struct blk_mq_hw_ctx *));
  10
  11 void blk_mq_sched_free_hctx_data(struct request_queue *q,
  12                                  void (*exit)(struct blk_mq_hw_ctx *));
  13
  14 struct request *blk_mq_sched_get_request(struct request_queue *q, struct bio *bio, unsigned int op, struct blk_mq_alloc_data *data);
  15 void blk_mq_sched_put_request(struct request *rq);
  16
  17 void blk_mq_sched_request_inserted(struct request *rq);
  18 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  19                                 struct request **merged_request);
  20 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio);
  21 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  22 void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
  23
  24 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
  25                                  bool run_queue, bool async, bool can_block);
  26 void blk_mq_sched_insert_requests(struct request_queue *q,
  27                                   struct blk_mq_ctx *ctx,
  28                                   struct list_head *list, bool run_queue_async);
  29
  30 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  31 void blk_mq_sched_move_to_dispatch(struct blk_mq_hw_ctx *hctx,
  32                         struct list_head *rq_list,
  33                         struct request *(*get_rq)(struct blk_mq_hw_ctx *));
  34
  35 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
  36 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
  37
  38 int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  39                            unsigned int hctx_idx);
  40 void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
  41                             unsigned int hctx_idx);
  42
  43 int blk_mq_sched_init(struct request_queue *q);
  44
  45 static inline bool
  46 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
  47 {
  48         struct elevator_queue *e = q->elevator;
  49
  50         if (!e || blk_queue_nomerges(q) || !bio_mergeable(bio))
  51                 return false;
  52
  53         return __blk_mq_sched_bio_merge(q, bio);
  54 }
  55
  56 static inline int blk_mq_sched_get_rq_priv(struct request_queue *q,
  57                                            struct request *rq,
  58                                            struct bio *bio)
  59 {
  60         struct elevator_queue *e = q->elevator;
  61
  62         if (e && e->type->ops.mq.get_rq_priv)
  63                 return e->type->ops.mq.get_rq_priv(q, rq, bio);
  64
  65         return 0;
  66 }
  67
  68 static inline void blk_mq_sched_put_rq_priv(struct request_queue *q,
  69                                             struct request *rq)
  70 {
  71         struct elevator_queue *e = q->elevator;
  72
  73         if (e && e->type->ops.mq.put_rq_priv)
  74                 e->type->ops.mq.put_rq_priv(q, rq);
  75 }
  76
  77 static inline bool
  78 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  79                          struct bio *bio)
  80 {
  81         struct elevator_queue *e = q->elevator;
  82
  83         if (e && e->type->ops.mq.allow_merge)
  84                 return e->type->ops.mq.allow_merge(q, rq, bio);
  85
  86         return true;
  87 }
  88
  89 static inline void
  90 blk_mq_sched_completed_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
  91 {
  92         struct elevator_queue *e = hctx->queue->elevator;
  93
  94         if (e && e->type->ops.mq.completed_request)
  95                 e->type->ops.mq.completed_request(hctx, rq);
  96
  97         BUG_ON(rq->internal_tag == -1);
  98
  99         blk_mq_put_tag(hctx, hctx->sched_tags, rq->mq_ctx, rq->internal_tag);
 100 }
 101
 102 static inline void blk_mq_sched_started_request(struct request *rq)
 103 {
 104         struct request_queue *q = rq->q;
 105         struct elevator_queue *e = q->elevator;
 106
 107         if (e && e->type->ops.mq.started_request)
 108                 e->type->ops.mq.started_request(rq);
 109 }
 110
 111 static inline void blk_mq_sched_requeue_request(struct request *rq)
 112 {
 113         struct request_queue *q = rq->q;
 114         struct elevator_queue *e = q->elevator;
 115
 116         if (e && e->type->ops.mq.requeue_request)
 117                 e->type->ops.mq.requeue_request(rq);
 118 }
 119
 120 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
 121 {
 122         struct elevator_queue *e = hctx->queue->elevator;
 123
 124         if (e && e->type->ops.mq.has_work)
 125                 return e->type->ops.mq.has_work(hctx);
 126
 127         return false;
 128 }
 129
 130 /*
 131  * Mark a hardware queue as needing a restart.
 132  */
 133 static inline void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx)
 134 {
 135         if (!test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
 136                 set_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 137 }
 138
 139 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
 140 {
 141         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 142 }
 143
 144 #endif