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https://github.com/torvalds/linux
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f26cdc8536
Storage controllers may expose multiple block devices that share hardware resources managed by blk-mq. This patch enhances the shared tags so a low-level driver can access the shared resources not tied to the unshared h/w contexts. This way the LLD can dynamically add and delete disks and request queues without having to track all the request_queue hctx's to iterate outstanding tags. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
92 lines
2.2 KiB
C
92 lines
2.2 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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atomic_t 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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atomic_t active_queues;
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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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int alloc_policy;
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cpumask_var_t cpumask;
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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, 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, unsigned int tag, unsigned int *last_tag);
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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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extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
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extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
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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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extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
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extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
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static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
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{
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if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
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return false;
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return __blk_mq_tag_busy(hctx);
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}
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static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
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{
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if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
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return;
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__blk_mq_tag_idle(hctx);
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}
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#endif
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