1/* SPDX-License-Identifier: MIT */
 2/*
 3 * Copyright © 2023 Intel Corporation
 4 */
 5
 6#ifndef _XE_RANGE_FENCE_H_
 7#define _XE_RANGE_FENCE_H_
 8
 9#include <linux/dma-fence.h>
10#include <linux/rbtree.h>
11#include <linux/types.h>
12
13struct xe_range_fence_tree;
14struct xe_range_fence;
15
16/** struct xe_range_fence_ops - XE range fence ops */
17struct xe_range_fence_ops {
18	/** @free: free range fence op */
19	void (*free)(struct xe_range_fence *rfence);
20};
21
22/** struct xe_range_fence - XE range fence (address conflict tracking) */
23struct xe_range_fence {
24	/** @rb: RB tree node inserted into interval tree */
25	struct rb_node rb;
26	/** @start: start address of range fence is interval tree */
27	u64 start;
28	/** @last: last address (inclusive) of range fence is interval tree */
29	u64 last;
30	/** @__subtree_last: interval tree internal usage */
31	u64 __subtree_last;
32	/**
33	 * @fence: fence signals address in range fence no longer has conflict
34	 */
35	struct dma_fence *fence;
36	/** @tree: interval tree which range fence belongs to */
37	struct xe_range_fence_tree *tree;
38	/**
39	 * @cb: callback when fence signals to remove range fence free from interval tree
40	 */
41	struct dma_fence_cb cb;
42	/** @link: used to defer free of range fence to non-irq context */
43	struct llist_node link;
44	/** @ops: range fence ops */
45	const struct xe_range_fence_ops *ops;
46};
47
48/** struct xe_range_fence_tree - interval tree to store range fences */
49struct xe_range_fence_tree {
50	/** @root: interval tree root */
51	struct rb_root_cached root;
52	/** @list: list of pending range fences to be freed */
53	struct llist_head list;
54};
55
56extern const struct xe_range_fence_ops xe_range_fence_kfree_ops;
57
58struct xe_range_fence *
59xe_range_fence_tree_first(struct xe_range_fence_tree *tree, u64 start,
60			  u64 last);
61
62struct xe_range_fence *
63xe_range_fence_tree_next(struct xe_range_fence *rfence, u64 start, u64 last);
64
65void xe_range_fence_tree_init(struct xe_range_fence_tree *tree);
66
67void xe_range_fence_tree_fini(struct xe_range_fence_tree *tree);
68
69int xe_range_fence_insert(struct xe_range_fence_tree *tree,
70			  struct xe_range_fence *rfence,
71			  const struct xe_range_fence_ops *ops,
72			  u64 start, u64 end,
73			  struct dma_fence *fence);
74
75#endif