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block/blk-mq-tag.h
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/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef INT_BLK_MQ_TAG_H #define INT_BLK_MQ_TAG_H |
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#include "blk-mq.h" |
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/* * Tag address space map. */ struct blk_mq_tags { unsigned int nr_tags; unsigned int nr_reserved_tags; |
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atomic_t active_queues; |
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struct sbitmap_queue bitmap_tags; struct sbitmap_queue breserved_tags; |
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struct request **rqs; |
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struct request **static_rqs; |
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struct list_head page_list; }; |
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extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
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extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
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extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
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extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags, struct blk_mq_ctx *ctx, unsigned int tag); |
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extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
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extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags **tags, unsigned int depth, bool can_grow); |
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extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
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void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, void *priv); |
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static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, struct blk_mq_hw_ctx *hctx) { if (!hctx) return &bt->ws[0]; return sbq_wait_ptr(bt, &hctx->wait_index); } |
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enum { BLK_MQ_TAG_CACHE_MIN = 1, BLK_MQ_TAG_CACHE_MAX = 64, }; enum { BLK_MQ_TAG_FAIL = -1U, BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, }; |
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extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) { if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) return false; return __blk_mq_tag_busy(hctx); } static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) { if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) return; __blk_mq_tag_idle(hctx); } |
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/* * This helper should only be used for flush request to share tag * with the request cloned from, and both the two requests can't be * in flight at the same time. The caller has to make sure the tag * can't be freed. */ static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag, struct request *rq) { hctx->tags->rqs[tag] = rq; } |
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static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags, unsigned int tag) { return tag < tags->nr_reserved_tags; } |
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#endif |