drm_addbufs
extern int drm_addbufs(struct drm_device *dev, void *data,
DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
err = drm_addbufs(dev, (void *)&buf, file_priv);