drm/via/via_video.c

0001 /*
0002  * Copyright 2005 Thomas Hellstrom. All Rights Reserved.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sub license,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice (including the
0012  * next paragraph) shall be included in all copies or substantial portions
0013  * of the Software.
0014  *
0015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0016  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0017  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
0018  * THE AUTHOR(S), AND/OR THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0019  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0020  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
0021  * DEALINGS IN THE SOFTWARE.
0022  *
0023  * Author: Thomas Hellstrom 2005.
0024  *
0025  * Video and XvMC related functions.
0026  */
0027
0028 #include <drm/drm_device.h>
0029 #include <drm/via_drm.h>
0030
0031 #include "via_drv.h"
0032
0033 void via_init_futex(drm_via_private_t *dev_priv)
0034 {
0035     unsigned int i;
0036
0037     DRM_DEBUG("\n");
0038
0039     for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
0040         init_waitqueue_head(&(dev_priv->decoder_queue[i]));
0041         XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
0042     }
0043 }
0044
0045 void via_cleanup_futex(drm_via_private_t *dev_priv)
0046 {
0047 }
0048
0049 void via_release_futex(drm_via_private_t *dev_priv, int context)
0050 {
0051     unsigned int i;
0052     volatile int *lock;
0053
0054     if (!dev_priv->sarea_priv)
0055         return;
0056
0057     for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
0058         lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
0059         if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
0060             if (_DRM_LOCK_IS_HELD(*lock)
0061                 && (*lock & _DRM_LOCK_CONT)) {
0062                 wake_up(&(dev_priv->decoder_queue[i]));
0063             }
0064             *lock = 0;
0065         }
0066     }
0067 }
0068
0069 int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
0070 {
0071     drm_via_futex_t *fx = data;
0072     volatile int *lock;
0073     drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
0074     drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
0075     int ret = 0;
0076
0077     DRM_DEBUG("\n");
0078
0079     if (fx->lock >= VIA_NR_XVMC_LOCKS)
0080         return -EFAULT;
0081
0082     lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
0083
0084     switch (fx->func) {
0085     case VIA_FUTEX_WAIT:
0086         VIA_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
0087                 (fx->ms / 10) * (HZ / 100), *lock != fx->val);
0088         return ret;
0089     case VIA_FUTEX_WAKE:
0090         wake_up(&(dev_priv->decoder_queue[fx->lock]));
0091         return 0;
0092     }
0093     return 0;
0094 }