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Commit db611527 authored by Noralf Trønnes's avatar Noralf Trønnes
Browse files

drm/gem: Add drm_gem_dumb_map_offset() 



Add a common drm_driver.dumb_map_offset function for GEM backed drivers.

Signed-off-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Reviewed-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1500837417-40580-2-git-send-email-noralf@tronnes.org
parent 4e6b1e91

drivers/gpu/drm/drm_gem.c

+35 −0
Original line number Diff line number Diff line
@@ -310,6 +310,41 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle) 
}

EXPORT_SYMBOL(drm_gem_handle_delete);



/**

 * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object

 * @file: drm file-private structure containing the gem object

 * @dev: corresponding drm_device

 * @handle: gem object handle

 * @offset: return location for the fake mmap offset

 *

 * This implements the &drm_driver.dumb_map_offset kms driver callback for

 * drivers which use gem to manage their backing storage.

 *

 * Returns:

 * 0 on success or a negative error code on failure.

 */

int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,

			    u32 handle, u64 *offset)

{

	struct drm_gem_object *obj;

	int ret;



	obj = drm_gem_object_lookup(file, handle);

	if (!obj)

		return -ENOENT;



	ret = drm_gem_create_mmap_offset(obj);

	if (ret)

		goto out;



	*offset = drm_vma_node_offset_addr(&obj->vma_node);

out:

	drm_gem_object_put_unlocked(obj);



	return ret;

}

EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset);



/**

 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers

 * @file: drm file-private structure to remove the dumb handle from

include/drm/drm_gem.h

+2 −0
Original line number Diff line number Diff line
@@ -302,6 +302,8 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, 
		bool dirty, bool accessed);



struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);

int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,

			    u32 handle, u64 *offset);

int drm_gem_dumb_destroy(struct drm_file *file,

			 struct drm_device *dev,

			 uint32_t handle);