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      1 /*	$NetBSD: via_video.c,v 1.8 2021/12/18 23:45:44 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2005 Thomas Hellstrom. All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sub license,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the
     14  * next paragraph) shall be included in all copies or substantial portions
     15  * of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     20  * THE AUTHOR(S), AND/OR THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     23  * DEALINGS IN THE SOFTWARE.
     24  *
     25  * Author: Thomas Hellstrom 2005.
     26  *
     27  * Video and XvMC related functions.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: via_video.c,v 1.8 2021/12/18 23:45:44 riastradh Exp $");
     32 
     33 #include <drm/drm_device.h>
     34 #include <drm/via_drm.h>
     35 
     36 #include "via_drv.h"
     37 
     38 void via_init_futex(drm_via_private_t *dev_priv)
     39 {
     40 	unsigned int i;
     41 
     42 	DRM_DEBUG("\n");
     43 
     44 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     45 #ifdef __NetBSD__
     46 		spin_lock_init(&dev_priv->decoder_lock[i]);
     47 		DRM_INIT_WAITQUEUE(&dev_priv->decoder_queue[i], "viadec");
     48 #else
     49 		init_waitqueue_head(&(dev_priv->decoder_queue[i]));
     50 #endif
     51 		XVMCLOCKPTR(dev_priv->sarea_priv, i)->lock = 0;
     52 	}
     53 }
     54 
     55 void via_cleanup_futex(drm_via_private_t *dev_priv)
     56 {
     57 #ifdef __NetBSD__
     58 	unsigned i;
     59 
     60 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     61 		DRM_DESTROY_WAITQUEUE(&dev_priv->decoder_queue[i]);
     62 		spin_lock_destroy(&dev_priv->decoder_lock[i]);
     63 	}
     64 #endif
     65 }
     66 
     67 void via_release_futex(drm_via_private_t *dev_priv, int context)
     68 {
     69 	unsigned int i;
     70 	volatile int *lock;
     71 
     72 	if (!dev_priv->sarea_priv)
     73 		return;
     74 
     75 	for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
     76 		lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
     77 		if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
     78 			if (_DRM_LOCK_IS_HELD(*lock)
     79 			    && (*lock & _DRM_LOCK_CONT)) {
     80 #ifdef __NetBSD__
     81 				spin_lock(&dev_priv->decoder_lock[i]);
     82 				DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[i],
     83 				    &dev_priv->decoder_lock[i]);
     84 				spin_unlock(&dev_priv->decoder_lock[i]);
     85 #else
     86 				wake_up(&(dev_priv->decoder_queue[i]));
     87 #endif
     88 			}
     89 			*lock = 0;
     90 		}
     91 	}
     92 }
     93 
     94 int via_decoder_futex(struct drm_device *dev, void *data, struct drm_file *file_priv)
     95 {
     96 	drm_via_futex_t *fx = data;
     97 	volatile int *lock;
     98 	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     99 	drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
    100 	int ret = 0;
    101 
    102 	DRM_DEBUG("\n");
    103 
    104 	if (fx->lock >= VIA_NR_XVMC_LOCKS)
    105 		return -EFAULT;
    106 
    107 	lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx->lock);
    108 
    109 	switch (fx->func) {
    110 	case VIA_FUTEX_WAIT:
    111 #ifdef __NetBSD__
    112 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
    113 		DRM_SPIN_WAIT_ON(ret, &dev_priv->decoder_queue[fx->lock],
    114 		    &dev_priv->decoder_lock[fx->lock],
    115 		    (fx->ms / 10) * (HZ / 100),
    116 		    *lock != fx->val);
    117 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
    118 #else
    119 		VIA_WAIT_ON(ret, dev_priv->decoder_queue[fx->lock],
    120 			    (fx->ms / 10) * (HZ / 100), *lock != fx->val);
    121 #endif
    122 		return ret;
    123 	case VIA_FUTEX_WAKE:
    124 #ifdef __NetBSD__
    125 		spin_lock(&dev_priv->decoder_lock[fx->lock]);
    126 		DRM_SPIN_WAKEUP_ALL(&dev_priv->decoder_queue[fx->lock],
    127 		    &dev_priv->decoder_lock[fx->lock]);
    128 		spin_unlock(&dev_priv->decoder_lock[fx->lock]);
    129 #else
    130 		wake_up(&(dev_priv->decoder_queue[fx->lock]));
    131 #endif
    132 		return 0;
    133 	}
    134 	return 0;
    135 }
    136