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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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c05f8525f6
Currently, this callback is called right after put_request() and has no distinguishable purpose. Instead, let's call it before put_request() as soon as I/O has completed on the request, before we account it in blk-stat. With this, Kyber can enable stats when it sees a latency outlier and make sure the outlier gets accounted. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
#ifndef BLK_MQ_SCHED_H
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#define BLK_MQ_SCHED_H
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#include "blk-mq.h"
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#include "blk-mq-tag.h"
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void blk_mq_sched_free_hctx_data(struct request_queue *q,
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void (*exit)(struct blk_mq_hw_ctx *));
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struct request *blk_mq_sched_get_request(struct request_queue *q, struct bio *bio, unsigned int op, struct blk_mq_alloc_data *data);
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void blk_mq_sched_put_request(struct request *rq);
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void blk_mq_sched_request_inserted(struct request *rq);
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bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
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struct request **merged_request);
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bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio);
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bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
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void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
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void blk_mq_sched_insert_request(struct request *rq, bool at_head,
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bool run_queue, bool async, bool can_block);
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void blk_mq_sched_insert_requests(struct request_queue *q,
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struct blk_mq_ctx *ctx,
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struct list_head *list, bool run_queue_async);
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void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
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void blk_mq_sched_move_to_dispatch(struct blk_mq_hw_ctx *hctx,
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struct list_head *rq_list,
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struct request *(*get_rq)(struct blk_mq_hw_ctx *));
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int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
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void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
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int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
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unsigned int hctx_idx);
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void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
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unsigned int hctx_idx);
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int blk_mq_sched_init(struct request_queue *q);
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static inline bool
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blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
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{
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struct elevator_queue *e = q->elevator;
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if (!e || blk_queue_nomerges(q) || !bio_mergeable(bio))
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return false;
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return __blk_mq_sched_bio_merge(q, bio);
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}
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static inline int blk_mq_sched_get_rq_priv(struct request_queue *q,
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struct request *rq,
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struct bio *bio)
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{
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struct elevator_queue *e = q->elevator;
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if (e && e->type->ops.mq.get_rq_priv)
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return e->type->ops.mq.get_rq_priv(q, rq, bio);
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return 0;
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}
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static inline void blk_mq_sched_put_rq_priv(struct request_queue *q,
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struct request *rq)
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{
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struct elevator_queue *e = q->elevator;
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if (e && e->type->ops.mq.put_rq_priv)
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e->type->ops.mq.put_rq_priv(q, rq);
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}
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static inline bool
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blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
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struct bio *bio)
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{
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struct elevator_queue *e = q->elevator;
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if (e && e->type->ops.mq.allow_merge)
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return e->type->ops.mq.allow_merge(q, rq, bio);
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return true;
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}
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static inline void blk_mq_sched_completed_request(struct request *rq)
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{
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struct elevator_queue *e = rq->q->elevator;
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if (e && e->type->ops.mq.completed_request)
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e->type->ops.mq.completed_request(rq);
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}
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static inline void blk_mq_sched_started_request(struct request *rq)
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{
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struct request_queue *q = rq->q;
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struct elevator_queue *e = q->elevator;
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if (e && e->type->ops.mq.started_request)
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e->type->ops.mq.started_request(rq);
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}
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static inline void blk_mq_sched_requeue_request(struct request *rq)
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{
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struct request_queue *q = rq->q;
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struct elevator_queue *e = q->elevator;
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if (e && e->type->ops.mq.requeue_request)
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e->type->ops.mq.requeue_request(rq);
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}
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static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
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{
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struct elevator_queue *e = hctx->queue->elevator;
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if (e && e->type->ops.mq.has_work)
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return e->type->ops.mq.has_work(hctx);
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return false;
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}
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/*
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* Mark a hardware queue as needing a restart.
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*/
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static inline void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx)
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{
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if (!test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
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set_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
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}
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static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
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{
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return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
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}
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#endif
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