xref: /netbsd-src/sys/external/bsd/drm2/dist/drm/via/via_video.c (revision 92e958de60c71aa0f2452bd7074cbb006fe6546b)
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 <drm/drmP.h>
29 #include <drm/via_drm.h>
30 #include "via_drv.h"
31 
32 void via_init_futex(drm_via_private_t *dev_priv)
33 {
34 	unsigned int i;
35 
36 	DRM_DEBUG("\n");
37 
38 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
39 #ifdef __NetBSD__
40 		spin_lock_init(&dev_priv->decoder_lock[i]);
41 		DRM_INIT_WAITQUEUE(&dev_priv->decoder_queue[i], "viadec");
42 #else
43 		init_waitqueue_head(&(dev_priv->decoder_queue[i]));
44 #endif
45 		XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
46 	}
47 }
48 
49 void via_cleanup_futex(drm_via_private_t *dev_priv)
50 {
51 #ifdef __NetBSD__
52 	unsigned i;
53 
54 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
55 		DRM_DESTROY_WAITQUEUE(&dev_priv->decoder_queue[i]);
56 		spin_lock_destroy(&dev_priv->decoder_lock[i]);
57 	}
58 #endif
59 }
60 
61 void via_release_futex(drm_via_private_t *dev_priv, int context)
62 {
63 	unsigned int i;
64 	volatile int *lock;
65 
66 	if (!dev_priv->sarea_priv)
67 		return;
68 
69 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
70 		lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
71 		if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
72 			if (_DRM_LOCK_IS_HELD(*lock)
73 			    && (*lock & _DRM_LOCK_CONT)) {
74 #ifdef __NetBSD__
75 				spin_lock(&dev_priv->decoder_lock[i]);
76 				DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[i],
77 				    &dev_priv->decoder_lock[i]);
78 				spin_unlock(&dev_priv->decoder_lock[i]);
79 #else
80 				wake_up(&(dev_priv->decoder_queue[i]));
81 #endif
82 			}
83 			*lock = 0;
84 		}
85 	}
86 }
87 
88 int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
89 {
90 	drm_via_futex_t *fx = data;
91 	volatile int *lock;
92 	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
93 	drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
94 	int ret = 0;
95 
96 	DRM_DEBUG("\n");
97 
98 	if (fx->lock >= VIA_NR_XVMC_LOCKS)
99 		return -EFAULT;
100 
101 	lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
102 
103 	switch (fx->func) {
104 	case VIA_FUTEX_WAIT:
105 #ifdef __NetBSD__
106 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
107 		DRM_SPIN_WAIT_ON(ret, &dev_priv->decoder_queue[fx->lock],
108 		    &dev_priv->decoder_lock[fx->lock],
109 		    (fx->ms / 10) * (DRM_HZ / 100),
110 		    *lock != fx->val);
111 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
112 #else
113 		DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
114 			    (fx->ms / 10) * (HZ / 100), *lock != fx->val);
115 #endif
116 		return ret;
117 	case VIA_FUTEX_WAKE:
118 #ifdef __NetBSD__
119 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
120 		DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[fx->lock],
121 		    &dev_priv->decoder_lock[fx->lock]);
122 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
123 #else
124 		wake_up(&(dev_priv->decoder_queue[fx->lock]));
125 #endif
126 		return 0;
127 	}
128 	return 0;
129 }
130