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);
  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                 unsigned int nr_segs, struct request **merged_request);
  16 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  17                 unsigned int nr_segs);
  18 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  19 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
  20 void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
  21
  22 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
  23                                  bool run_queue, bool async);
  24 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
  25                                   struct blk_mq_ctx *ctx,
  26                                   struct list_head *list, bool run_queue_async);
  27
  28 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  29
  30 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
  31 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
  32 void blk_mq_sched_free_requests(struct request_queue *q);
  33
  34 static inline bool
  35 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  36                 unsigned int nr_segs)
  37 {
  38         if (blk_queue_nomerges(q) || !bio_mergeable(bio))
  39                 return false;
  40
  41         return __blk_mq_sched_bio_merge(q, bio, nr_segs);
  42 }
  43
  44 static inline bool
  45 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  46                          struct bio *bio)
  47 {
  48         struct elevator_queue *e = q->elevator;
  49
  50         if (e && e->type->ops.allow_merge)
  51                 return e->type->ops.allow_merge(q, rq, bio);
  52
  53         return true;
  54 }
  55
  56 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  57 {
  58         struct elevator_queue *e = rq->q->elevator;
  59
  60         if (e && e->type->ops.completed_request)
  61                 e->type->ops.completed_request(rq, now);
  62 }
  63
  64 static inline void blk_mq_sched_requeue_request(struct request *rq)
  65 {
  66         struct request_queue *q = rq->q;
  67         struct elevator_queue *e = q->elevator;
  68
  69         if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
  70                 e->type->ops.requeue_request(rq);
  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