drm/exynos: Add a new function to get gem buffer size

This patch adds a new function to get gem buffer size. And this
funtion could be used for g2d driver or others can get gem buffer
size to check if the buffer is valid or not.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 67e17ce112b69eb5ce795358e1471fd9db2ad841..0e6fe000578c08c78be0df9fa00e2205429e8576 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -164,6 +164,27 @@ out:
        exynos_gem_obj = NULL;
 }
 
+unsigned long exynos_drm_gem_get_size(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 0;
+       }
+
+       exynos_gem_obj = to_exynos_gem_obj(obj);
+
+       drm_gem_object_unreference_unlocked(obj);
+
+       return exynos_gem_obj->buffer->size;
+}
+
+
 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
                                                      unsigned long size)
 {

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index 35ebac47dc2bacfec928d54001b6065aa9e75564..468766bee450837eefe19f37db7e7fdcc00133c6 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -130,6 +130,11 @@ int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data,
 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file_priv);
 
+/* get buffer size to gem handle. */
+unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
+                                               unsigned int gem_handle,
+                                               struct drm_file *file_priv);
+
 /* initialize gem object. */
 int exynos_drm_gem_init_object(struct drm_gem_object *obj);