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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: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210408140139.27731-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-04-08 16:01:36 +02:00
parent d4e6823609
commit 5690e48639
2 changed files with 37 additions and 1 deletions
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33
drivers/gpu/drm/drm_gem_ttm_helper.c
View File

@ -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");

5
include/drm/drm_gem_ttm_helper.h
View File

@ -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