drm_gem_create_mmap_offset — create a fake mmap offset for an object
int drm_gem_create_mmap_offset ( | struct drm_gem_object * obj); |
GEM memory mapping works by handing back to userspace a fake mmap offset it can use in a subsequent mmap(2) call. The DRM core code then looks up the object based on the offset and sets up the various memory mapping structures.
This routine allocates and attaches a fake offset for obj.
Drivers can call drm_gem_free_mmap_offset before freeing obj to release
the fake offset again.