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authorOmar Sandoval <osandov@fb.com>2016-09-17 08:38:44 -0600
committerJens Axboe <axboe@fb.com>2016-09-17 08:38:44 -0600
commit88459642cba452630326b9cab1c651e09577d4e4 (patch)
treecd7ecd917b294a92ff827b0e7dab526f0069547f /block/blk-mq-tag.h
parent703fd1c0f177219e3a84e6c095c31dc566514d81 (diff)
blk-mq: abstract tag allocation out into sbitmap library
This is a generally useful data structure, so make it available to anyone else who might want to use it. It's also a nice cleanup separating the allocation logic from the rest of the tag handling logic. The code is behind a new Kconfig option, CONFIG_SBITMAP, which is only selected by CONFIG_BLOCK for now. This should be a complete noop functionality-wise. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-tag.h')
-rw-r--r--block/blk-mq-tag.h37
1 files changed, 10 insertions, 27 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index d468a79f2c4a..3215c08c63cc 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -3,31 +3,6 @@
#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.
*/
@@ -37,8 +12,8 @@ struct blk_mq_tags {
atomic_t active_queues;
- struct blk_mq_bitmap_tags bitmap_tags;
- struct blk_mq_bitmap_tags breserved_tags;
+ struct sbitmap_queue bitmap_tags;
+ struct sbitmap_queue breserved_tags;
struct request **rqs;
struct list_head page_list;
@@ -61,6 +36,14 @@ extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
void *priv);
+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);
+}
+
enum {
BLK_MQ_TAG_CACHE_MIN = 1,
BLK_MQ_TAG_CACHE_MAX = 64,