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Currently we lookup ICQ only after the request is allocated. However BFQ will want to decide how many scheduler tags it allows a given bfq queue (effectively a process) to consume based on cgroup weight. So provide a function blk_mq_sched_get_icq() so that BFQ can lookup ICQ earlier. Acked-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20211125133645.27483-1-jack@suse.cz Signed-off-by: Jens Axboe <axboe@kernel.dk>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BLK_MQ_SCHED_H
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#define BLK_MQ_SCHED_H
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#include "elevator.h"
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#include "blk-mq.h"
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#include "blk-mq-tag.h"
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#define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
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struct io_cq *blk_mq_sched_get_icq(struct request_queue *q);
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void blk_mq_sched_assign_ioc(struct request *rq);
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bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
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unsigned int nr_segs, 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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unsigned int nr_segs);
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bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
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struct list_head *free);
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void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
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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);
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void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
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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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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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void blk_mq_sched_free_rqs(struct request_queue *q);
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static inline void blk_mq_sched_restart(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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__blk_mq_sched_restart(hctx);
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}
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static inline bool bio_mergeable(struct bio *bio)
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{
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return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
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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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if (rq->rq_flags & RQF_ELV) {
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struct elevator_queue *e = q->elevator;
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if (e->type->ops.allow_merge)
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return e->type->ops.allow_merge(q, rq, bio);
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}
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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, u64 now)
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{
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if (rq->rq_flags & RQF_ELV) {
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struct elevator_queue *e = rq->q->elevator;
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if (e->type->ops.completed_request)
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e->type->ops.completed_request(rq, now);
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}
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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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if (rq->rq_flags & RQF_ELV) {
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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 ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
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e->type->ops.requeue_request(rq);
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}
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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.has_work)
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return e->type->ops.has_work(hctx);
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return false;
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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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