diff options
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 4c780efff169..f78f455ae8aa 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -4075,6 +4075,51 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain, return 0; } +/* + * Group numbers are arbitrary. Device with the same group number + * indicate the iommu cannot differentiate between them. To avoid + * tracking used groups we just use the seg|bus|devfn of the lowest + * level we're able to differentiate devices + */ +static int intel_iommu_device_group(struct device *dev, unsigned int *groupid) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_dev *bridge; + union { + struct { + u8 devfn; + u8 bus; + u16 segment; + } pci; + u32 group; + } id; + + if (iommu_no_mapping(dev)) + return -ENODEV; + + id.pci.segment = pci_domain_nr(pdev->bus); + id.pci.bus = pdev->bus->number; + id.pci.devfn = pdev->devfn; + + if (!device_to_iommu(id.pci.segment, id.pci.bus, id.pci.devfn)) + return -ENODEV; + + bridge = pci_find_upstream_pcie_bridge(pdev); + if (bridge) { + if (pci_is_pcie(bridge)) { + id.pci.bus = bridge->subordinate->number; + id.pci.devfn = 0; + } else { + id.pci.bus = bridge->bus->number; + id.pci.devfn = bridge->devfn; + } + } + + *groupid = id.group; + + return 0; +} + static struct iommu_ops intel_iommu_ops = { .domain_init = intel_iommu_domain_init, .domain_destroy = intel_iommu_domain_destroy, @@ -4084,6 +4129,7 @@ static struct iommu_ops intel_iommu_ops = { .unmap = intel_iommu_unmap, .iova_to_phys = intel_iommu_iova_to_phys, .domain_has_cap = intel_iommu_domain_has_cap, + .device_group = intel_iommu_device_group, .pgsize_bitmap = INTEL_IOMMU_PGSIZES, }; |