Merge branches 'iommu/page-sizes' and 'iommu/group-id' into next
[~shefty/rdma-dev.git] / drivers / iommu / intel-iommu.c
index aea72e11e166dd397a8725059ff13e16d23c78d6..77e3b917c8da8a6767e47fae9bf9532394c1190d 100644 (file)
@@ -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,
 };