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 --- drivers/gpu/drm/exynos/exynos_drm_gem.c | 58 +++++++++++++++++++++++++++++++ drivers/gpu/drm/exynos/exynos_drm_gem.h | 18 +++++++++ 2 files changed, 76 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index 36d081d..ddcb7e3 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -377,6 +377,64 @@ 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) { diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h b/drivers/gpu/drm/exynos/exynos_drm_gem.h index 096267d..e40fbad 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.h +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h @@ -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);