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drm/exynos: added new funtion to get/put dma address. 

this function would be used for drm based 2d acceleration driver
to get/put dma address through gem handle.
when exynos_drm_get_dma_address is called reference count of
gem object would be increased not to be released by gem close and
when exynos_drm_put_dma_address is called the reference count of
this gem object would be decreased to be released.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Inki Dae 2012-03-16 18:47:06 +09:00 committed by Dave Airlie
parent 2b35892e9d
commit f0b1bda725
2 changed files with 76 additions and 0 deletions
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58
drivers/gpu/drm/exynos/exynos_drm_gem.c
View File

@ -386,6 +386,64 @@ int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
return 0;
}
void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return ERR_PTR(-EINVAL);
}
exynos_gem_obj = to_exynos_gem_obj(obj);
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
DRM_DEBUG_KMS("not support NONCONTIG type.\n");
drm_gem_object_unreference_unlocked(obj);
/* TODO */
return ERR_PTR(-EINVAL);
}
return &exynos_gem_obj->buffer->dma_addr;
}
void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return;
}
exynos_gem_obj = to_exynos_gem_obj(obj);
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
DRM_DEBUG_KMS("not support NONCONTIG type.\n");
drm_gem_object_unreference_unlocked(obj);
/* TODO */
return;
}
drm_gem_object_unreference_unlocked(obj);
/*
* decrease obj->refcount one more time because we has already
* increased it at exynos_drm_gem_get_dma_addr().
*/
drm_gem_object_unreference_unlocked(obj);
}
int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{

18
drivers/gpu/drm/exynos/exynos_drm_gem.h
View File

@ -88,6 +88,24 @@ struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
/*
* get dma address from gem handle and this function could be used for
* other drivers such as 2d/3d acceleration drivers.
* with this function call, gem object reference count would be increased.
*/
void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv);
/*
* put dma address from gem handle and this function could be used for
* other drivers such as 2d/3d acceleration drivers.
* with this function call, gem object reference count would be decreased.
*/
void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv);
/* get buffer offset to map to user space. */
int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);