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}
98