/** * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object * @obj: obj in question * @size: the virtual size * * 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(). */ int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) { struct drm_device *dev = obj->dev; return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node, size / PAGE_SIZE); }
/** * drm_gem_create_mmap_offset - create a fake mmap offset for an object * @obj: obj in question * * 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. */ int drm_gem_create_mmap_offset(struct drm_gem_object *obj) { struct drm_device *dev = obj->dev; struct drm_gem_mm *mm = dev->mm_private; return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node, obj->size / PAGE_SIZE); }