acpiiort_smmu_map
return acpiiort_smmu_map(node, rid, dmat);
bus_dma_tag_t acpiiort_smmu_map(struct acpi_iort_node *, uint32_t, bus_dma_tag_t);
pa->pa_dmat = acpiiort_smmu_map(node, rid, pa->pa_dmat);