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 fence *fence)
25{
26	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
27	return seqno_fence->ops->get_driver_name(fence);
28}
29
30static const char *seqno_fence_get_timeline_name(struct fence *fence)
31{
32	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
33	return seqno_fence->ops->get_timeline_name(fence);
34}
35
36static bool seqno_enable_signaling(struct fence *fence)
37{
38	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
39	return seqno_fence->ops->enable_signaling(fence);
40}
41
42static bool seqno_signaled(struct fence *fence)
43{
44	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
45	return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
46}
47
48static void seqno_release(struct fence *fence)
49{
50	struct seqno_fence *f = to_seqno_fence(fence);
51
52	dma_buf_put(f->sync_buf);
53	if (f->ops->release)
54		f->ops->release(fence);
55	else
56		fence_free(&f->base);
57}
58
59static signed long seqno_wait(struct fence *fence, bool intr, signed long timeout)
60{
61	struct seqno_fence *f = to_seqno_fence(fence);
62	return f->ops->wait(fence, intr, timeout);
63}
64
65const struct fence_ops seqno_fence_ops = {
66	.get_driver_name = seqno_fence_get_driver_name,
67	.get_timeline_name = seqno_fence_get_timeline_name,
68	.enable_signaling = seqno_enable_signaling,
69	.signaled = seqno_signaled,
70	.wait = seqno_wait,
71	.release = seqno_release,
72};
73EXPORT_SYMBOL(seqno_fence_ops);
74