LXR linux/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#define MAX_SCHED_RQ (16 * BLKDEV_MAX_RQ)
   9
  10void blk_mq_sched_assign_ioc(struct request *rq);
  11
  12bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  13                unsigned int nr_segs, struct request **merged_request);
  14bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  15                unsigned int nr_segs);
  16bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
  17                                   struct list_head *free);
  18void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
  19void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
  20
  21void blk_mq_sched_insert_request(struct request *rq, bool at_head,
  22                                 bool run_queue, bool async);
  23void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
  24                                  struct blk_mq_ctx *ctx,
  25                                  struct list_head *list, bool run_queue_async);
  26
  27void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  28
  29int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
  30void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
  31void blk_mq_sched_free_requests(struct request_queue *q);
  32
  33static inline bool
  34blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  35                unsigned int nr_segs)
  36{
  37        if (blk_queue_nomerges(q) || !bio_mergeable(bio))
  38                return false;
  39
  40        return __blk_mq_sched_bio_merge(q, bio, nr_segs);
  41}
  42
  43static inline bool
  44blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  45                         struct bio *bio)
  46{
  47        struct elevator_queue *e = q->elevator;
  48
  49        if (e && e->type->ops.allow_merge)
  50                return e->type->ops.allow_merge(q, rq, bio);
  51
  52        return true;
  53}
  54
  55static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  56{
  57        struct elevator_queue *e = rq->q->elevator;
  58
  59        if (e && e->type->ops.completed_request)
  60                e->type->ops.completed_request(rq, now);
  61}
  62
  63static inline void blk_mq_sched_requeue_request(struct request *rq)
  64{
  65        struct request_queue *q = rq->q;
  66        struct elevator_queue *e = q->elevator;
  67
  68        if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
  69                e->type->ops.requeue_request(rq);
  70}
  71
  72static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  73{
  74        struct elevator_queue *e = hctx->queue->elevator;
  75
  76        if (e && e->type->ops.has_work)
  77                return e->type->ops.has_work(hctx);
  78
  79        return false;
  80}
  81
  82static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  83{
  84        return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  85}
  86
  87#endif
  88