/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include static void iommu_read_resources(struct device *dev) { struct resource *res; /* Get the normal pci resources of this device */ pci_dev_read_resources(dev); /* Add an extra subtractive resource for both memory and I/O. */ res = new_resource(dev, 0x44); res->size = 512 * 1024; res->align = log2(res->size); res->gran = log2(res->size); res->limit = 0xffffffff; /* 4G */ res->flags = IORESOURCE_MEM; } static void iommu_set_resources(struct device *dev) { struct resource *res; pci_dev_set_resources(dev); res = find_resource(dev, 0x44); /* Remember this resource has been stored */ res->flags |= IORESOURCE_STORED; /* For now, do only 32-bit space allocation */ pci_write_config32(dev, 0x48, 0x0); pci_write_config32(dev, 0x44, res->base | (1 << 0)); } static struct device_operations iommu_ops = { .read_resources = iommu_read_resources, .set_resources = iommu_set_resources, .enable_resources = pci_dev_enable_resources, .ops_pci = &pci_dev_ops_pci, }; static const struct pci_driver iommu_driver __pci_driver = { .ops = &iommu_ops, .vendor = PCI_VENDOR_ID_AMD, .device = PCI_DEVICE_ID_AMD_15H_MODEL_101F_NB_IOMMU, };