Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / block / blk-mq-tag.h

diff --git a/kernel/block/blk-mq-tag.h b/kernel/block/blk-mq-tag.h
new file mode 100644 (file)
index 0000000..90767b3
--- /dev/null
+++ b/kernel/block/blk-mq-tag.h
@@ -0,0 +1,91 @@
+#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