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 "elevator.h"
   6 #include "blk-mq.h"
   7 #include "blk-mq-tag.h"
   8
   9 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
  10
  11 void blk_mq_sched_assign_ioc(struct request *rq);
  12
  13 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  14                 unsigned int nr_segs, struct request **merged_request);
  15 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  16                 unsigned int nr_segs);
  17 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
  18                                    struct list_head *free);
  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_rqs(struct request_queue *q);
  33
  34 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
  35 {
  36         if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
  37                 __blk_mq_sched_restart(hctx);
  38 }
  39
  40 static inline bool bio_mergeable(struct bio *bio)
  41 {
  42         return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
  43 }
  44
  45 static inline bool
  46 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  47                          struct bio *bio)
  48 {
  49         if (rq->rq_flags & RQF_ELV) {
  50                 struct elevator_queue *e = q->elevator;
  51
  52                 if (e->type->ops.allow_merge)
  53                         return e->type->ops.allow_merge(q, rq, bio);
  54         }
  55         return true;
  56 }
  57
  58 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  59 {
  60         if (rq->rq_flags & RQF_ELV) {
  61                 struct elevator_queue *e = rq->q->elevator;
  62
  63                 if (e->type->ops.completed_request)
  64                         e->type->ops.completed_request(rq, now);
  65         }
  66 }
  67
  68 static inline void blk_mq_sched_requeue_request(struct request *rq)
  69 {
  70         if (rq->rq_flags & RQF_ELV) {
  71                 struct request_queue *q = rq->q;
  72                 struct elevator_queue *e = q->elevator;
  73
  74                 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
  75                         e->type->ops.requeue_request(rq);
  76         }
  77 }
  78
  79 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  80 {
  81         struct elevator_queue *e = hctx->queue->elevator;
  82
  83         if (e && e->type->ops.has_work)
  84                 return e->type->ops.has_work(hctx);
  85
  86         return false;
  87 }
  88
  89 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  90 {
  91         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  92 }
  93
  94 #endif