iommu_device_map
fa.fa_dmat = iommu_device_map(fa.fa_node, fa.fa_dmat);
fa.fa_dmat = iommu_device_map(fa.fa_node, fa.fa_dmat);
bus_dma_tag_t iommu_device_map(int, bus_dma_tag_t);
pdev->dmat = iommu_device_map(pdev->node, dmat);