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1802d0be | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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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> | |
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10 | */ |
11 | ||
12 | #ifndef __LINUX_DMA_FENCE_ARRAY_H | |
13 | #define __LINUX_DMA_FENCE_ARRAY_H | |
14 | ||
15 | #include <linux/dma-fence.h> | |
03e4e0a9 | 16 | #include <linux/irq_work.h> |
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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 | */ | |
23 | struct 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 | |
3725cd09 | 35 | * @work: internal irq_work function |
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36 | */ |
37 | struct dma_fence_array { | |
38 | struct dma_fence base; | |
39 | ||
40 | spinlock_t lock; | |
41 | unsigned num_fences; | |
42 | atomic_t num_pending; | |
43 | struct dma_fence **fences; | |
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44 | |
45 | struct irq_work work; | |
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46 | }; |
47 | ||
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48 | /** |
49 | * to_dma_fence_array - cast a fence to a dma_fence_array | |
50 | * @fence: fence to cast to a dma_fence_array | |
51 | * | |
52 | * Returns NULL if the fence is not a dma_fence_array, | |
53 | * or the dma_fence_array otherwise. | |
54 | */ | |
55 | static inline struct dma_fence_array * | |
56 | to_dma_fence_array(struct dma_fence *fence) | |
57 | { | |
976b6d97 | 58 | if (!fence || !dma_fence_is_array(fence)) |
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59 | return NULL; |
60 | ||
61 | return container_of(fence, struct dma_fence_array, base); | |
62 | } | |
63 | ||
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64 | /** |
65 | * dma_fence_array_for_each - iterate over all fences in array | |
66 | * @fence: current fence | |
67 | * @index: index into the array | |
68 | * @head: potential dma_fence_array object | |
69 | * | |
70 | * Test if @array is a dma_fence_array object and if yes iterate over all fences | |
71 | * in the array. If not just iterate over the fence in @array itself. | |
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72 | * |
73 | * For a deep dive iterator see dma_fence_unwrap_for_each(). | |
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74 | */ |
75 | #define dma_fence_array_for_each(fence, index, head) \ | |
76 | for (index = 0, fence = dma_fence_array_first(head); fence; \ | |
77 | ++(index), fence = dma_fence_array_next(head, index)) | |
78 | ||
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79 | struct dma_fence_array *dma_fence_array_create(int num_fences, |
80 | struct dma_fence **fences, | |
81 | u64 context, unsigned seqno, | |
82 | bool signal_on_any); | |
83 | ||
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84 | bool dma_fence_match_context(struct dma_fence *fence, u64 context); |
85 | ||
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86 | struct dma_fence *dma_fence_array_first(struct dma_fence *head); |
87 | struct dma_fence *dma_fence_array_next(struct dma_fence *head, | |
88 | unsigned int index); | |
89 | ||
f54d1867 | 90 | #endif /* __LINUX_DMA_FENCE_ARRAY_H */ |