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
25/**
26 * struct dma_fence_array_cb - callback helper for fence array
27 * @cb: fence callback structure for signaling
28 * @array: reference to the parent fence array object
29 */
30struct dma_fence_array_cb {
31	struct dma_fence_cb cb;
32	struct dma_fence_array *array;
33};
34
35/**
36 * struct dma_fence_array - fence to represent an array of fences
37 * @base: fence base class
38 * @lock: spinlock for fence handling
39 * @num_fences: number of fences in the array
40 * @num_pending: fences in the array still pending
41 * @fences: array of the fences
42 */
43struct dma_fence_array {
44	struct dma_fence base;
45
46	spinlock_t lock;
47	unsigned num_fences;
48	atomic_t num_pending;
49	struct dma_fence **fences;
 
 
50};
51
52extern const struct dma_fence_ops dma_fence_array_ops;
53
54/**
55 * dma_fence_is_array - check if a fence is from the array subsclass
56 * @fence: fence to test
57 *
58 * Return true if it is a dma_fence_array and false otherwise.
59 */
60static inline bool dma_fence_is_array(struct dma_fence *fence)
61{
62	return fence->ops == &dma_fence_array_ops;
63}
64
65/**
66 * to_dma_fence_array - cast a fence to a dma_fence_array
67 * @fence: fence to cast to a dma_fence_array
68 *
69 * Returns NULL if the fence is not a dma_fence_array,
70 * or the dma_fence_array otherwise.
71 */
72static inline struct dma_fence_array *
73to_dma_fence_array(struct dma_fence *fence)
74{
75	if (fence->ops != &dma_fence_array_ops)
76		return NULL;
77
78	return container_of(fence, struct dma_fence_array, base);
79}
80
81struct dma_fence_array *dma_fence_array_create(int num_fences,
82					       struct dma_fence **fences,
83					       u64 context, unsigned seqno,
84					       bool signal_on_any);
 
 
85
86#endif /* __LINUX_DMA_FENCE_ARRAY_H */

 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 */
31struct 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 */
44struct dma_fence_array {
45	struct dma_fence base;
46
47	spinlock_t lock;
48	unsigned num_fences;
49	atomic_t num_pending;
50	struct dma_fence **fences;
51
52	struct irq_work work;
53};
54
55extern const struct dma_fence_ops dma_fence_array_ops;
56
57/**
58 * dma_fence_is_array - check if a fence is from the array subsclass
59 * @fence: fence to test
60 *
61 * Return true if it is a dma_fence_array and false otherwise.
62 */
63static inline bool dma_fence_is_array(struct dma_fence *fence)
64{
65	return fence->ops == &dma_fence_array_ops;
66}
67
68/**
69 * to_dma_fence_array - cast a fence to a dma_fence_array
70 * @fence: fence to cast to a dma_fence_array
71 *
72 * Returns NULL if the fence is not a dma_fence_array,
73 * or the dma_fence_array otherwise.
74 */
75static inline struct dma_fence_array *
76to_dma_fence_array(struct dma_fence *fence)
77{
78	if (fence->ops != &dma_fence_array_ops)
79		return NULL;
80
81	return container_of(fence, struct dma_fence_array, base);
82}
83
84struct dma_fence_array *dma_fence_array_create(int num_fences,
85					       struct dma_fence **fences,
86					       u64 context, unsigned seqno,
87					       bool signal_on_any);
88
89bool dma_fence_match_context(struct dma_fence *fence, u64 context);
90
91#endif /* __LINUX_DMA_FENCE_ARRAY_H */