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
seqno_fence_get_driver_name(struct fence * fence)24 static 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
seqno_fence_get_timeline_name(struct fence * fence)30 static 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
seqno_enable_signaling(struct fence * fence)36 static 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
seqno_signaled(struct fence * fence)42 static 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
seqno_release(struct fence * fence)48 static 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
seqno_wait(struct fence * fence,bool intr,signed long timeout)59 static 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
65 const 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 };
73 EXPORT_SYMBOL(seqno_fence_ops);
74