1 | /* |
2 | * fence-array: aggregates fence to be waited together |
3 | * |
4 | * Copyright (C) 2016 Collabora Ltd |
5 | * Copyright (C) 2016 Advanced Micro Devices, Inc. |
6 | * Authors: |
7 | * Gustavo Padovan <gustavo@padovan.org> |
8 | * Christian König <christian.koenig@amd.com> |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify it |
11 | * under the terms of the GNU General Public License version 2 as published by |
12 | * the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, but WITHOUT |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
17 | * more details. |
18 | */ |
19 | |
20 | #ifndef __LINUX_DMA_FENCE_ARRAY_H |
21 | #define __LINUX_DMA_FENCE_ARRAY_H |
22 | |
23 | #include <linux/dma-fence.h> |
24 | #include <linux/irq_work.h> |
25 | |
26 | /** |
27 | * struct dma_fence_array_cb - callback helper for fence array |
28 | * @cb: fence callback structure for signaling |
29 | * @array: reference to the parent fence array object |
30 | */ |
31 | struct dma_fence_array_cb { |
32 | struct dma_fence_cb cb; |
33 | struct dma_fence_array *array; |
34 | }; |
35 | |
36 | /** |
37 | * struct dma_fence_array - fence to represent an array of fences |
38 | * @base: fence base class |
39 | * @lock: spinlock for fence handling |
40 | * @num_fences: number of fences in the array |
41 | * @num_pending: fences in the array still pending |
42 | * @fences: array of the fences |
43 | * @work: internal irq_work function |
44 | */ |
45 | struct dma_fence_array { |
46 | struct dma_fence base; |
47 | |
48 | spinlock_t lock; |
49 | unsigned num_fences; |
50 | atomic_t num_pending; |
51 | struct dma_fence **fences; |
52 | |
53 | struct irq_work work; |
54 | }; |
55 | |
56 | extern const struct dma_fence_ops dma_fence_array_ops; |
57 | |
58 | /** |
59 | * dma_fence_is_array - check if a fence is from the array subsclass |
60 | * @fence: fence to test |
61 | * |
62 | * Return true if it is a dma_fence_array and false otherwise. |
63 | */ |
64 | static inline bool dma_fence_is_array(struct dma_fence *fence) |
65 | { |
66 | return fence->ops == &dma_fence_array_ops; |
67 | } |
68 | |
69 | /** |
70 | * to_dma_fence_array - cast a fence to a dma_fence_array |
71 | * @fence: fence to cast to a dma_fence_array |
72 | * |
73 | * Returns NULL if the fence is not a dma_fence_array, |
74 | * or the dma_fence_array otherwise. |
75 | */ |
76 | static inline struct dma_fence_array * |
77 | to_dma_fence_array(struct dma_fence *fence) |
78 | { |
79 | if (fence->ops != &dma_fence_array_ops) |
80 | return NULL; |
81 | |
82 | return container_of(fence, struct dma_fence_array, base); |
83 | } |
84 | |
85 | struct dma_fence_array *dma_fence_array_create(int num_fences, |
86 | struct dma_fence **fences, |
87 | u64 context, unsigned seqno, |
88 | bool signal_on_any); |
89 | |
90 | bool dma_fence_match_context(struct dma_fence *fence, u64 context); |
91 | |
92 | #endif /* __LINUX_DMA_FENCE_ARRAY_H */ |
93 | |