iommu_iova_to_phys
addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
phy_addr = iommu_iova_to_phys(domain, bfr->iova);
phys_addr_t iommu_iova_to_phys(struct iommu_domain *, dma_addr_t);