drm_gem_create_mmap_offset_size9
Create a fake mmap offset for an object
Usage
int drm_gem_create_mmap_offset_size(struct drm_gem_object * obj, size_t size);
Arguments
obj
obj in question
size
the virtual size
Overview
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, in cases where the virtual size differs from the physical size (ie. obj->size). Otherwise just use drm_gem_create_mmap_offset.