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Diffstat (limited to 'drivers/iommu/intel-iommu.c')
-rw-r--r--drivers/iommu/intel-iommu.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index aea72e11e166..77e3b917c8da 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4080,6 +4080,54 @@ 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;
+ }
+ }
+
+ if (!pdev->is_virtfn && iommu_group_mf)
+ id.pci.devfn = PCI_DEVFN(PCI_SLOT(id.pci.devfn), 0);
+
+ *groupid = id.group;
+
+ return 0;
+}
+
static struct iommu_ops intel_iommu_ops = {
.domain_init = intel_iommu_domain_init,
.domain_destroy = intel_iommu_domain_destroy,
@@ -4089,6 +4137,7 @@ 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,
};