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drm/radeon: add a way to revoke hyper-z access 

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Marek Olšák 2010-08-07 03:36:34 +02:00 committed by Dave Airlie
parent c17c2f892e
commit 43861f713c
1 changed files with 20 additions and 6 deletions
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26
drivers/gpu/drm/radeon/radeon_kms.c
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@ -162,13 +162,27 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
return -EINVAL;
}
case RADEON_INFO_WANT_HYPERZ:
mutex_lock(&dev->struct_mutex);
if (rdev->hyperz_filp)
value = 0;
else {
rdev->hyperz_filp = filp;
value = 1;
/* The "value" here is both an input and output parameter.
* If the input value is 1, filp requests hyper-z access.
* If the input value is 0, filp revokes its hyper-z access.
*
* When returning, the value is 1 if filp owns hyper-z access,
* 0 otherwise. */
if (value >= 2) {
DRM_DEBUG_KMS("WANT_HYPERZ: invalid value %d\n", value);
return -EINVAL;
}
mutex_lock(&dev->struct_mutex);
if (value == 1) {
/* wants hyper-z */
if (!rdev->hyperz_filp)
rdev->hyperz_filp = filp;
} else if (value == 0) {
/* revokes hyper-z */
if (rdev->hyperz_filp == filp)
rdev->hyperz_filp = NULL;
}
value = rdev->hyperz_filp == filp ? 1 : 0;
mutex_unlock(&dev->struct_mutex);
break;
default: