via_video.c

Go to the documentation of this file.

/*
 * Copyright 2005 Thomas Hellstrom. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S), AND/OR THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Author: Thomas Hellstrom 2005.
 *
 * Video and XvMC related functions.
 */

#include <drm/drmP.h>
#include <drm/via_drm.h>
#include "via_drv.h"

void via_init_futex(drm_via_private_t *dev_priv)
{
    unsigned int i;

    DRM_DEBUG("\n");

    for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
        DRM_INIT_WAITQUEUE(&(dev_priv->decoder_queue[i]));
        XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
    }
}

void via_cleanup_futex(drm_via_private_t *dev_priv)
{
}

void via_release_futex(drm_via_private_t *dev_priv, int context)
{
    unsigned int i;
    volatile int *lock;

    if (!dev_priv->sarea_priv)
        return;

    for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
        lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
        if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
            if (_DRM_LOCK_IS_HELD(*lock)
                && (*lock & _DRM_LOCK_CONT)) {
                DRM_WAKEUP(&(dev_priv->decoder_queue[i]));
            }
            *lock = 0;
        }
    }
}

int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
    drm_via_futex_t *fx = data;
    volatile int *lock;
    drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
    drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
    int ret = 0;

    DRM_DEBUG("\n");

    if (fx->lock >= VIA_NR_XVMC_LOCKS)
        return -EFAULT;

    lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);

    switch (fx->func) {
    case VIA_FUTEX_WAIT:
        DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
                (fx->ms / 10) * (DRM_HZ / 100), *lock != fx->val);
        return ret;
    case VIA_FUTEX_WAKE:
        DRM_WAKEUP(&(dev_priv->decoder_queue[fx->lock]));
        return 0;
    }
    return 0;
}