LXR linux/drivers/gpu/drm/via/via

   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("\n");
  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(struct drm_device *dev, void *data, struct drm_file *file_priv)
  69{
  70        drm_via_futex_t *fx = data;
  71        volatile int *lock;
  72        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
  73        drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
  74        int ret = 0;
  75
  76        DRM_DEBUG("\n");
  77
  78        if (fx->lock > VIA_NR_XVMC_LOCKS)
  79                return -EFAULT;
  80
  81        lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
  82
  83        switch (fx->func) {
  84        case VIA_FUTEX_WAIT:
  85                DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
  86                            (fx->ms / 10) * (DRM_HZ / 100), *lock != fx->val);
  87                return ret;
  88        case VIA_FUTEX_WAKE:
  89                DRM_WAKEUP(&(dev_priv->decoder_queue[fx->lock]));
  90                return 0;
  91        }
  92        return 0;
  93}
  94