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_assign_ioc(struct request *rq);
   9
  10 void blk_mq_sched_request_inserted(struct request *rq);
  11 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  12                 unsigned int nr_segs, struct request **merged_request);
  13 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  14                 unsigned int nr_segs);
  15 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  16 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
  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);
  21 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
  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 void blk_mq_sched_free_requests(struct request_queue *q);
  30
  31 static inline bool
  32 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  33                 unsigned int nr_segs)
  34 {
  35         if (blk_queue_nomerges(q) || !bio_mergeable(bio))
  36                 return false;
  37
  38         return __blk_mq_sched_bio_merge(q, bio, nr_segs);
  39 }
  40
  41 static inline bool
  42 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  43                          struct bio *bio)
  44 {
  45         struct elevator_queue *e = q->elevator;
  46
  47         if (e && e->type->ops.allow_merge)
  48                 return e->type->ops.allow_merge(q, rq, bio);
  49
  50         return true;
  51 }
  52
  53 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  54 {
  55         struct elevator_queue *e = rq->q->elevator;
  56
  57         if (e && e->type->ops.completed_request)
  58                 e->type->ops.completed_request(rq, now);
  59 }
  60
  61 static inline void blk_mq_sched_requeue_request(struct request *rq)
  62 {
  63         struct request_queue *q = rq->q;
  64         struct elevator_queue *e = q->elevator;
  65
  66         if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
  67                 e->type->ops.requeue_request(rq);
  68 }
  69
  70 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  71 {
  72         struct elevator_queue *e = hctx->queue->elevator;
  73
  74         if (e && e->type->ops.has_work)
  75                 return e->type->ops.has_work(hctx);
  76
  77         return false;
  78 }
  79
  80 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  81 {
  82         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  83 }
  84
  85 #endif