tree: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/host-vmd head: 155f39b4552f5ea5f6d0a4c7d942445369c32b08 commit: 155f39b4552f5ea5f6d0a4c7d942445369c32b08 [7/7] iommu/vt-d: Prevent VMD child devices from being remapping targets config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 6.2.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 155f39b4552f5ea5f6d0a4c7d942445369c32b08 # save the attached .config to linux build tree make.cross ARCH=ia64 All errors (new ones prefixed by >>): drivers/iommu/intel-iommu.c: In function 'device_to_iommu': >> drivers/iommu/intel-iommu.c:906:7: error: implicit declaration of function 'is_vmd' [-Werror=implicit-function-declaration] if (is_vmd(pdev->bus)) ^~~~~~ cc1: some warnings being treated as errors vim +/is_vmd +906 drivers/iommu/intel-iommu.c 887 888 static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) 889 { 890 struct dmar_drhd_unit *drhd = NULL; 891 struct intel_iommu *iommu; 892 struct device *tmp; 893 struct pci_dev *ptmp, *pdev = NULL; 894 u16 segment = 0; 895 int i; 896 897 if (iommu_dummy(dev)) 898 return NULL; 899 900 if (dev_is_pci(dev)) { 901 struct pci_dev *pf_pdev; 902 903 pdev = to_pci_dev(dev); 904 905 /* VMD child devices currently cannot be handled individually */ > 906 if (is_vmd(pdev->bus)) 907 return NULL; 908 909 /* VFs aren't listed in scope tables; we need to look up 910 * the PF instead to find the IOMMU. */ 911 pf_pdev = pci_physfn(pdev); 912 dev = &pf_pdev->dev; 913 segment = pci_domain_nr(pdev->bus); 914 } else if (has_acpi_companion(dev)) 915 dev = &ACPI_COMPANION(dev)->dev; 916 917 rcu_read_lock(); 918 for_each_active_iommu(iommu, drhd) { 919 if (pdev && segment != drhd->segment) 920 continue; 921 922 for_each_active_dev_scope(drhd->devices, 923 drhd->devices_cnt, i, tmp) { 924 if (tmp == dev) { 925 /* For a VF use its original BDF# not that of the PF 926 * which we used for the IOMMU lookup. Strictly speaking 927 * we could do this for all PCI devices; we only need to 928 * get the BDF# from the scope table for ACPI matches. */ 929 if (pdev && pdev->is_virtfn) 930 goto got_pdev; 931 932 *bus = drhd->devices[i].bus; 933 *devfn = drhd->devices[i].devfn; 934 goto out; 935 } 936 937 if (!pdev || !dev_is_pci(tmp)) 938 continue; 939 940 ptmp = to_pci_dev(tmp); 941 if (ptmp->subordinate && 942 ptmp->subordinate->number <= pdev->bus->number && 943 ptmp->subordinate->busn_res.end >= pdev->bus->number) 944 goto got_pdev; 945 } 946 947 if (pdev && drhd->include_all) { 948 got_pdev: 949 *bus = pdev->bus->number; 950 *devfn = pdev->devfn; 951 goto out; 952 } 953 } 954 iommu = NULL; 955 out: 956 rcu_read_unlock(); 957 958 return iommu; 959 } 960 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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