1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * fence-array: aggregates fence to be waited together
4 *
5 * Copyright (C) 2016 Collabora Ltd
6 * Copyright (C) 2016 Advanced Micro Devices, Inc.
7 * Authors:
8 * Gustavo Padovan <gustavo@padovan.org>
9 * Christian König <christian.koenig@amd.com>
10 */
11
12#ifndef __LINUX_DMA_FENCE_ARRAY_H
13#define __LINUX_DMA_FENCE_ARRAY_H
14
15#include <linux/dma-fence.h>
16#include <linux/irq_work.h>
17
18/**
19 * struct dma_fence_array_cb - callback helper for fence array
20 * @cb: fence callback structure for signaling
21 * @array: reference to the parent fence array object
22 */
23struct dma_fence_array_cb {
24 struct dma_fence_cb cb;
25 struct dma_fence_array *array;
26};
27
28/**
29 * struct dma_fence_array - fence to represent an array of fences
30 * @base: fence base class
31 * @lock: spinlock for fence handling
32 * @num_fences: number of fences in the array
33 * @num_pending: fences in the array still pending
34 * @fences: array of the fences
35 * @work: internal irq_work function
36 * @callbacks: array of callback helpers
37 */
38struct dma_fence_array {
39 struct dma_fence base;
40
41 spinlock_t lock;
42 unsigned num_fences;
43 atomic_t num_pending;
44 struct dma_fence **fences;
45
46 struct irq_work work;
47
48 struct dma_fence_array_cb callbacks[] __counted_by(num_fences);
49};
50
51/**
52 * to_dma_fence_array - cast a fence to a dma_fence_array
53 * @fence: fence to cast to a dma_fence_array
54 *
55 * Returns NULL if the fence is not a dma_fence_array,
56 * or the dma_fence_array otherwise.
57 */
58static inline struct dma_fence_array *
59to_dma_fence_array(struct dma_fence *fence)
60{
61 if (!fence || !dma_fence_is_array(fence))
62 return NULL;
63
64 return container_of(fence, struct dma_fence_array, base);
65}
66
67/**
68 * dma_fence_array_for_each - iterate over all fences in array
69 * @fence: current fence
70 * @index: index into the array
71 * @head: potential dma_fence_array object
72 *
73 * Test if @array is a dma_fence_array object and if yes iterate over all fences
74 * in the array. If not just iterate over the fence in @array itself.
75 *
76 * For a deep dive iterator see dma_fence_unwrap_for_each().
77 */
78#define dma_fence_array_for_each(fence, index, head) \
79 for (index = 0, fence = dma_fence_array_first(head); fence; \
80 ++(index), fence = dma_fence_array_next(head, index))
81
82struct dma_fence_array *dma_fence_array_alloc(int num_fences);
83void dma_fence_array_init(struct dma_fence_array *array,
84 int num_fences, struct dma_fence **fences,
85 u64 context, unsigned seqno,
86 bool signal_on_any);
87
88struct dma_fence_array *dma_fence_array_create(int num_fences,
89 struct dma_fence **fences,
90 u64 context, unsigned seqno,
91 bool signal_on_any);
92
93bool dma_fence_match_context(struct dma_fence *fence, u64 context);
94
95struct dma_fence *dma_fence_array_first(struct dma_fence *head);
96struct dma_fence *dma_fence_array_next(struct dma_fence *head,
97 unsigned int index);
98
99#endif /* __LINUX_DMA_FENCE_ARRAY_H */
100

source code of linux/include/linux/dma-fence-array.h