drm_addmap_ioctl
extern int drm_addmap_ioctl(struct drm_device *dev, void *data,
DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
err = drm_addmap_ioctl(dev, (void *)&map, file_priv);