tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2005 Thomas Hellstrom. All Rights Reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S), AND/OR THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Author: Thomas Hellstrom 2005.
24 *
25 * Video and XvMC related functions.
26 */
27
28#include "drmP.h"
29#include "via_drm.h"
30#include "via_drv.h"
31
32void via_init_futex(drm_via_private_t * dev_priv)
33{
34 unsigned int i;
35
36 DRM_DEBUG("%s\n", __FUNCTION__);
37
38 for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
39 DRM_INIT_WAITQUEUE(&(dev_priv->decoder_queue[i]));
40 XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
41 }
42}
43
44void via_cleanup_futex(drm_via_private_t * dev_priv)
45{
46}
47
48void via_release_futex(drm_via_private_t * dev_priv, int context)
49{
50 unsigned int i;
51 volatile int *lock;
52
53 if (!dev_priv->sarea_priv)
54 return;
55
56 for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
57 lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
58 if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
59 if (_DRM_LOCK_IS_HELD(*lock)
60 && (*lock & _DRM_LOCK_CONT)) {
61 DRM_WAKEUP(&(dev_priv->decoder_queue[i]));
62 }
63 *lock = 0;
64 }
65 }
66}
67
68int via_decoder_futex(DRM_IOCTL_ARGS)
69{
70 DRM_DEVICE;
71 drm_via_futex_t fx;
72 volatile int *lock;
73 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
74 drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
75 int ret = 0;
76
77 DRM_DEBUG("%s\n", __FUNCTION__);
78
79 DRM_COPY_FROM_USER_IOCTL(fx, (drm_via_futex_t __user *) data,
80 sizeof(fx));
81
82 if (fx.lock > VIA_NR_XVMC_LOCKS)
83 return -EFAULT;
84
85 lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx.lock);
86
87 switch (fx.func) {
88 case VIA_FUTEX_WAIT:
89 DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx.lock],
90 (fx.ms / 10) * (DRM_HZ / 100), *lock != fx.val);
91 return ret;
92 case VIA_FUTEX_WAKE:
93 DRM_WAKEUP(&(dev_priv->decoder_queue[fx.lock]));
94 return 0;
95 }
96 return 0;
97}