1 files changed, 73 insertions, 0 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
new file mode 100644
index 000000000..91ff37e3b
--- /dev/null
+++ b/block/blk-mq-tag.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef INT_BLK_MQ_TAG_H
+#define INT_BLK_MQ_TAG_H
+
+struct blk_mq_alloc_data;
+
+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 int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
+			       struct sbitmap_queue *breserved_tags,
+			       unsigned int queue_depth,
+			       unsigned int reserved,
+			       int node, int alloc_policy);
+
+extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
+unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
+			      unsigned int *offset);
+extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
+			   unsigned int tag);
+void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
+extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
+					struct blk_mq_tags **tags,
+					unsigned int depth, bool can_grow);
+extern void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
+					     unsigned int size);
+extern void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
+
+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_tag_iter_fn *fn,
+		void *priv);
+void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_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_NO_TAG		= -1U,
+	BLK_MQ_TAG_MIN		= 1,
+	BLK_MQ_TAG_MAX		= BLK_MQ_NO_TAG - 1,
+};
+
+extern void __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
+extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
+
+static inline void blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
+{
+	if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
+		__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_QUEUE_SHARED))
+		return;
+
+	__blk_mq_tag_idle(hctx);
+}
+
+static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
+					  unsigned int tag)
+{
+	return tag < tags->nr_reserved_tags;
+}
+
+#endif