iommu/intel: Implement iommu_device_group
We generally have BDF granularity for devices, so we just need to make sure devices aren't hidden behind PCIe-to-PCI bridges. We can then make up a group number that's simply the concatenated seg|bus|dev|fn so we don't have to track them (not that users should depend on that). Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Acked-By: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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@ -4060,6 +4060,51 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
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return 0;
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}
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/*
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* Group numbers are arbitrary. Device with the same group number
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* indicate the iommu cannot differentiate between them. To avoid
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* tracking used groups we just use the seg|bus|devfn of the lowest
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* level we're able to differentiate devices
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*/
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static int intel_iommu_device_group(struct device *dev, unsigned int *groupid)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pci_dev *bridge;
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union {
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struct {
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u8 devfn;
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u8 bus;
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u16 segment;
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} pci;
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u32 group;
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} id;
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if (iommu_no_mapping(dev))
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return -ENODEV;
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id.pci.segment = pci_domain_nr(pdev->bus);
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id.pci.bus = pdev->bus->number;
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id.pci.devfn = pdev->devfn;
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if (!device_to_iommu(id.pci.segment, id.pci.bus, id.pci.devfn))
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return -ENODEV;
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bridge = pci_find_upstream_pcie_bridge(pdev);
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if (bridge) {
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if (pci_is_pcie(bridge)) {
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id.pci.bus = bridge->subordinate->number;
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id.pci.devfn = 0;
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} else {
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id.pci.bus = bridge->bus->number;
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id.pci.devfn = bridge->devfn;
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}
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}
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*groupid = id.group;
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return 0;
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}
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static struct iommu_ops intel_iommu_ops = {
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.domain_init = intel_iommu_domain_init,
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.domain_destroy = intel_iommu_domain_destroy,
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@ -4069,6 +4114,7 @@ static struct iommu_ops intel_iommu_ops = {
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.unmap = intel_iommu_unmap,
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.iova_to_phys = intel_iommu_iova_to_phys,
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.domain_has_cap = intel_iommu_domain_has_cap,
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.device_group = intel_iommu_device_group,
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};
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static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
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