+static struct dmar_domain *set_domain_for_dev(struct device *dev,
+ struct dmar_domain *domain)
+{
+ struct intel_iommu *iommu;
+ struct dmar_domain *tmp;
+ u16 req_id, dma_alias;
+ u8 bus, devfn;
+
+ iommu = device_to_iommu(dev, &bus, &devfn);
+ if (!iommu)
+ return NULL;
+
+ req_id = ((u16)bus << 8) | devfn;
+
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias);
+
+ /* register PCI DMA alias device */
+ if (req_id != dma_alias) {
+ tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias),
+ dma_alias & 0xff, NULL, domain);
+
+ if (!tmp || tmp != domain)
+ return tmp;
+ }