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via_video.c revision 1.5 
      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/drmP.h>
     29 #include <drm/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("\n");
     37 
     38 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     39 #ifdef __NetBSD__
     40 		spin_lock_init(&dev_priv->decoder_lock[i]);
     41 		DRM_INIT_WAITQUEUE(&dev_priv->decoder_queue[i], "viadec");
     42 #else
     43 		init_waitqueue_head(&(dev_priv->decoder_queue[i]));
     44 #endif
     45 		XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
     46 	}
     47 }
     48 
     49 void via_cleanup_futex(drm_via_private_t *dev_priv)
     50 {
     51 #ifdef __NetBSD__
     52 	unsigned i;
     53 
     54 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     55 		DRM_DESTROY_WAITQUEUE(&dev_priv->decoder_queue[i]);
     56 		spin_lock_destroy(&dev_priv->decoder_lock[i]);
     57 	}
     58 #endif
     59 }
     60 
     61 void via_release_futex(drm_via_private_t *dev_priv, int context)
     62 {
     63 	unsigned int i;
     64 	volatile int *lock;
     65 
     66 	if (!dev_priv->sarea_priv)
     67 		return;
     68 
     69 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     70 		lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
     71 		if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
     72 			if (_DRM_LOCK_IS_HELD(*lock)
     73 			    && (*lock & _DRM_LOCK_CONT)) {
     74 #ifdef __NetBSD__
     75 				spin_lock(&dev_priv->decoder_lock[i]);
     76 				DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[i],
     77 				    &dev_priv->decoder_lock[i]);
     78 				spin_unlock(&dev_priv->decoder_lock[i]);
     79 #else
     80 				wake_up(&(dev_priv->decoder_queue[i]));
     81 #endif
     82 			}
     83 			*lock = 0;
     84 		}
     85 	}
     86 }
     87 
     88 int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
     89 {
     90 	drm_via_futex_t *fx = data;
     91 	volatile int *lock;
     92 	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     93 	drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
     94 	int ret = 0;
     95 
     96 	DRM_DEBUG("\n");
     97 
     98 	if (fx->lock >= VIA_NR_XVMC_LOCKS)
     99 		return -EFAULT;
    100 
    101 	lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
    102 
    103 	switch (fx->func) {
    104 	case VIA_FUTEX_WAIT:
    105 #ifdef __NetBSD__
    106 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
    107 		DRM_SPIN_WAIT_ON(ret, &dev_priv->decoder_queue[fx->lock],
    108 		    &dev_priv->decoder_lock[fx->lock],
    109 		    (fx->ms / 10) * (DRM_HZ / 100),
    110 		    *lock != fx->val);
    111 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
    112 #else
    113 		DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
    114 			    (fx->ms / 10) * (HZ / 100), *lock != fx->val);
    115 #endif
    116 		return ret;
    117 	case VIA_FUTEX_WAKE:
    118 #ifdef __NetBSD__
    119 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
    120 		DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[fx->lock],
    121 		    &dev_priv->decoder_lock[fx->lock]);
    122 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
    123 #else
    124 		wake_up(&(dev_priv->decoder_queue[fx->lock]));
    125 #endif
    126 		return 0;
    127 	}
    128 	return 0;
    129 }
    130