e93ecf602b
We will use it for the pending list in blk-mq core as well. Signed-off-by: Jens Axboe <axboe@fb.com>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
#ifndef INT_BLK_MQ_TAG_H
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#define INT_BLK_MQ_TAG_H
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#include "blk-mq.h"
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enum {
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BT_WAIT_QUEUES = 8,
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BT_WAIT_BATCH = 8,
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};
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struct bt_wait_state {
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atomic_t wait_cnt;
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wait_queue_head_t wait;
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} ____cacheline_aligned_in_smp;
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#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
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#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
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struct blk_mq_bitmap_tags {
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unsigned int depth;
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unsigned int wake_cnt;
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unsigned int bits_per_word;
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unsigned int map_nr;
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struct blk_align_bitmap *map;
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unsigned int wake_index;
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struct bt_wait_state *bs;
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};
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/*
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* Tag address space map.
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*/
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struct blk_mq_tags {
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unsigned int nr_tags;
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unsigned int nr_reserved_tags;
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struct blk_mq_bitmap_tags bitmap_tags;
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struct blk_mq_bitmap_tags breserved_tags;
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struct request **rqs;
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struct list_head page_list;
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};
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extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
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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_tags *tags, struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
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extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved);
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extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag);
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extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
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extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
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extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
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extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
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enum {
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BLK_MQ_TAG_CACHE_MIN = 1,
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BLK_MQ_TAG_CACHE_MAX = 64,
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};
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enum {
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BLK_MQ_TAG_FAIL = -1U,
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BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
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BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
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};
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#endif
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