drivers/char/drm/via_video.c

   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
  32 void 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
  44 void via_cleanup_futex(drm_via_private_t * dev_priv)
  45 {
  46 }
  47
  48 void 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
  68 int 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 }