1/*
 2 * seqno-fence, using a dma-buf to synchronize fencing
 3 *
 4 * Copyright (C) 2012 Texas Instruments
 5 * Copyright (C) 2012-2014 Canonical Ltd
 6 * Authors:
 7 *   Rob Clark <robdclark@gmail.com>
 8 *   Maarten Lankhorst <maarten.lankhorst@canonical.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#include <linux/slab.h>
21#include <linux/export.h>
22#include <linux/seqno-fence.h>
23
24static const char *seqno_fence_get_driver_name(struct dma_fence *fence)
25{
26	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
27
28	return seqno_fence->ops->get_driver_name(fence);
29}
30
31static const char *seqno_fence_get_timeline_name(struct dma_fence *fence)
32{
33	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
34
35	return seqno_fence->ops->get_timeline_name(fence);
36}
37
38static bool seqno_enable_signaling(struct dma_fence *fence)
39{
40	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
41
42	return seqno_fence->ops->enable_signaling(fence);
43}
44
45static bool seqno_signaled(struct dma_fence *fence)
46{
47	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
48
49	return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
50}
51
52static void seqno_release(struct dma_fence *fence)
53{
54	struct seqno_fence *f = to_seqno_fence(fence);
55
56	dma_buf_put(f->sync_buf);
57	if (f->ops->release)
58		f->ops->release(fence);
59	else
60		dma_fence_free(&f->base);
61}
62
63static signed long seqno_wait(struct dma_fence *fence, bool intr,
64			      signed long timeout)
65{
66	struct seqno_fence *f = to_seqno_fence(fence);
67
68	return f->ops->wait(fence, intr, timeout);
69}
70
71const struct dma_fence_ops seqno_fence_ops = {
72	.get_driver_name = seqno_fence_get_driver_name,
73	.get_timeline_name = seqno_fence_get_timeline_name,
74	.enable_signaling = seqno_enable_signaling,
75	.signaled = seqno_signaled,
76	.wait = seqno_wait,
77	.release = seqno_release,
78};
79EXPORT_SYMBOL(seqno_fence_ops);