mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 19:53:59 +08:00
24391c0dc5
This is the blk-mq part to support tag allocation policy. The default allocation policy isn't changed (though it's not a strict FIFO). The new policy is round-robin for libata. But it's a try-best implementation. If multiple tasks are competing, the tags returned will be mixed (which is unavoidable even with !mq, as requests from different tasks can be mixed in queue) Cc: Jens Axboe <axboe@fb.com> Cc: Tejun Heo <tj@kernel.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
#ifndef INT_BLK_MQ_TAG_H
|
|
#define INT_BLK_MQ_TAG_H
|
|
|
|
#include "blk-mq.h"
|
|
|
|
enum {
|
|
BT_WAIT_QUEUES = 8,
|
|
BT_WAIT_BATCH = 8,
|
|
};
|
|
|
|
struct bt_wait_state {
|
|
atomic_t wait_cnt;
|
|
wait_queue_head_t wait;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
|
|
#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
|
|
|
|
struct blk_mq_bitmap_tags {
|
|
unsigned int depth;
|
|
unsigned int wake_cnt;
|
|
unsigned int bits_per_word;
|
|
|
|
unsigned int map_nr;
|
|
struct blk_align_bitmap *map;
|
|
|
|
atomic_t wake_index;
|
|
struct bt_wait_state *bs;
|
|
};
|
|
|
|
/*
|
|
* Tag address space map.
|
|
*/
|
|
struct blk_mq_tags {
|
|
unsigned int nr_tags;
|
|
unsigned int nr_reserved_tags;
|
|
|
|
atomic_t active_queues;
|
|
|
|
struct blk_mq_bitmap_tags bitmap_tags;
|
|
struct blk_mq_bitmap_tags breserved_tags;
|
|
|
|
struct request **rqs;
|
|
struct list_head page_list;
|
|
|
|
int alloc_policy;
|
|
};
|
|
|
|
|
|
extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
|
|
extern void blk_mq_free_tags(struct blk_mq_tags *tags);
|
|
|
|
extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
|
|
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
|
|
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
|
|
extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
|
|
extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
|
|
extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
|
|
extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
|
|
|
|
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,
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
#endif
|