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 | */ |
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 |
35 | * @work: internal irq_work function |
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; |
44 | |
45 | struct irq_work work; |
46 | }; |
47 | |
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 | { |
58 | if (!fence || !dma_fence_is_array(fence)) |
59 | return NULL; |
60 | |
61 | return container_of(fence, struct dma_fence_array, base); |
62 | } |
63 | |
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. |
72 | * |
73 | * For a deep dive iterator see dma_fence_unwrap_for_each(). |
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 | |
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 | |
84 | bool dma_fence_match_context(struct dma_fence *fence, u64 context); |
85 | |
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 | |
90 | #endif /* __LINUX_DMA_FENCE_ARRAY_H */ |
91 | |