cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

via_video.c (2751B)

      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 <drm/drm_device.h>
     29#include <drm/via_drm.h>
     30
     31#include "via_drv.h"
     32
     33void via_init_futex(drm_via_private_t *dev_priv)
     34{
     35	unsigned int i;
     36
     37	DRM_DEBUG("\n");
     38
     39	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     40		init_waitqueue_head(&(dev_priv->decoder_queue[i]));
     41		XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
     42	}
     43}
     44
     45void via_cleanup_futex(drm_via_private_t *dev_priv)
     46{
     47}
     48
     49void via_release_futex(drm_via_private_t *dev_priv, int context)
     50{
     51	unsigned int i;
     52	volatile int *lock;
     53
     54	if (!dev_priv->sarea_priv)
     55		return;
     56
     57	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     58		lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
     59		if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
     60			if (_DRM_LOCK_IS_HELD(*lock)
     61			    && (*lock & _DRM_LOCK_CONT)) {
     62				wake_up(&(dev_priv->decoder_queue[i]));
     63			}
     64			*lock = 0;
     65		}
     66	}
     67}
     68
     69int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
     70{
     71	drm_via_futex_t *fx = data;
     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("\n");
     78
     79	if (fx->lock >= VIA_NR_XVMC_LOCKS)
     80		return -EFAULT;
     81
     82	lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
     83
     84	switch (fx->func) {
     85	case VIA_FUTEX_WAIT:
     86		VIA_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
     87			    (fx->ms / 10) * (HZ / 100), *lock != fx->val);
     88		return ret;
     89	case VIA_FUTEX_WAKE:
     90		wake_up(&(dev_priv->decoder_queue[fx->lock]));
     91		return 0;
     92	}
     93	return 0;
     94}