intel-iommu: Cope with yet another BIOS screwup causing crashes (2ff729f5) · Commits · e / devices / android_kernel_teracube_2e

drivers/pci/intel-iommu.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -1975,6 +1975,17 @@ static int iommu_prepare_identity_map(struct pci_dev *pdev,
		"IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
		pci_name(pdev), start, end);

		if (end >> agaw_to_width(domain->agaw)) {
		WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
		"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
		agaw_to_width(domain->agaw),
		dmi_get_system_info(DMI_BIOS_VENDOR),
		dmi_get_system_info(DMI_BIOS_VERSION),
		dmi_get_system_info(DMI_PRODUCT_VERSION));
		ret = -EIO;
		goto error;
		}

		ret = iommu_domain_identity_map(domain, start, end);
		if (ret)
		goto error;