iommulib_iommu_dma_sync
error = iommulib_iommu_dma_sync(dip, rdip, dma_handle, off,
return (iommulib_iommu_dma_sync(dip, rdip, dma_handle, off, len,
int iommulib_iommu_dma_sync(dev_info_t *dip, dev_info_t *rdip,