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
  33 via_init_futex(drm_via_private_t *dev_priv)
  34 {
  35         unsigned int i;
  36
  37         DRM_DEBUG("%s\n", __FUNCTION__);
  38
  39         for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
  40                 DRM_INIT_WAITQUEUE(&(dev_priv->decoder_queue[i]));
  41                 XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
  42         }
  43 }
  44
  45 void
  46 via_cleanup_futex(drm_via_private_t *dev_priv)
  47 {
  48 }
  49
  50 void
  51 via_release_futex(drm_via_private_t *dev_priv, int context)
  52 {
  53         unsigned int i;
  54         volatile int *lock;
  55
  56         for (i=0; i < VIA_NR_XVMC_LOCKS; ++i) {
  57                 lock = (int *) XVMCLOCKPTR(dev_priv->sarea_priv, i);
  58                 if ( (_DRM_LOCKING_CONTEXT( *lock ) == context)) {
  59                         if (_DRM_LOCK_IS_HELD( *lock ) && (*lock & _DRM_LOCK_CONT)) {
  60                                 DRM_WAKEUP( &(dev_priv->decoder_queue[i]));
  61                         }
  62                         *lock = 0;
  63                 }
  64         }
  65 }
  66
  67 int
  68 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 *) data, sizeof(fx));
  80
  81         if (fx.lock > VIA_NR_XVMC_LOCKS)
  82                 return -EFAULT;
  83
  84         lock = (int *)XVMCLOCKPTR(sAPriv, fx.lock);
  85
  86         switch (fx.func) {
  87         case VIA_FUTEX_WAIT:
  88                 DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx.lock],
  89                             (fx.ms / 10) * (DRM_HZ / 100), *lock != fx.val);
  90                 return ret;
  91         case VIA_FUTEX_WAKE:
  92                 DRM_WAKEUP(&(dev_priv->decoder_queue[fx.lock]));
  93                 return 0;
  94         }
  95         return 0;
  96 }
  97