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-rw-r--r--block/blk-mq-tag.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
new file mode 100644
index 000000000..f887988e5
--- /dev/null
+++ b/block/blk-mq-tag.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef INT_BLK_MQ_TAG_H
+#define INT_BLK_MQ_TAG_H
+
+/*
+ * Tag address space map.
+ */
+struct blk_mq_tags {
+ unsigned int nr_tags;
+ unsigned int nr_reserved_tags;
+
+ atomic_t active_queues;
+
+ struct sbitmap_queue *bitmap_tags;
+ struct sbitmap_queue *breserved_tags;
+
+ struct sbitmap_queue __bitmap_tags;
+ struct sbitmap_queue __breserved_tags;
+
+ struct request **rqs;
+ struct request **static_rqs;
+ struct list_head page_list;
+
+ /*
+ * used to clear request reference in rqs[] before freeing one
+ * request pool
+ */
+ spinlock_t lock;
+};
+
+extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
+ unsigned int reserved_tags,
+ int node, unsigned int flags);
+extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
+
+extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
+ unsigned int flags);
+extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
+
+extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
+extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
+ unsigned int tag);
+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_sbitmap(struct blk_mq_tag_set *set,
+ unsigned int size);
+
+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);
+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 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_QUEUE_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_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