Commit 5690e486 authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

drm/gem-ttm-helper: Provide helper for struct drm_driver.dumb_map_offset 



Provides an implementation of struct drm_driver.dumb_map_offset that
can be used by TTM-based GEM drivers.

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Acked-by: default avatarMaxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210408140139.27731-2-tzimmermann@suse.de
parent d4e68236

drivers/gpu/drm/drm_gem_ttm_helper.c

+33 −0
Original line number Diff line number Diff line
@@ -114,5 +114,38 @@ int drm_gem_ttm_mmap(struct drm_gem_object *gem, 
}

EXPORT_SYMBOL(drm_gem_ttm_mmap);



/**

 * drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset

 * @file:	DRM file pointer.

 * @dev:	DRM device.

 * @handle:	GEM handle

 * @offset:	Returns the mapping's memory offset on success

 *

 * Provides an implementation of struct &drm_driver.dumb_map_offset for

 * TTM-based GEM drivers. TTM allocates the offset internally and

 * drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations.

 *

 * See struct &drm_driver.dumb_map_offset.

 *

 * Returns:

 * 0 on success, or a negative errno code otherwise.

 */

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

				uint32_t handle, uint64_t *offset)

{

	struct drm_gem_object *gem;



	gem = drm_gem_object_lookup(file, handle);

	if (!gem)

		return -ENOENT;



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



	drm_gem_object_put(gem);



	return 0;

}

EXPORT_SYMBOL(drm_gem_ttm_dumb_map_offset);



MODULE_DESCRIPTION("DRM gem ttm helpers");

MODULE_LICENSE("GPL");

include/drm/drm_gem_ttm_helper.h

+4 −1
Original line number Diff line number Diff line
@@ -5,8 +5,8 @@ 


#include <linux/kernel.h>



#include <drm/drm_gem.h>

#include <drm/drm_device.h>

#include <drm/drm_gem.h>

#include <drm/ttm/ttm_bo_api.h>

#include <drm/ttm/ttm_bo_driver.h>
@@ -24,4 +24,7 @@ void drm_gem_ttm_vunmap(struct drm_gem_object *gem, 
int drm_gem_ttm_mmap(struct drm_gem_object *gem,

		     struct vm_area_struct *vma);



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

				uint32_t handle, uint64_t *offset);



#endif