AMD IOMMU: add device detach function for IOMMU API

Impact: add a generic function to detach devices from protection domains

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 891d713..ef9b309 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1657,4 +1657,30 @@ static void amd_iommu_domain_destroy(struct iommu_domain *dom)
        dom->priv = NULL;
 }
 
+static void amd_iommu_detach_device(struct iommu_domain *dom,
+                                   struct device *dev)
+{
+       struct protection_domain *domain = dom->priv;
+       struct amd_iommu *iommu;
+       struct pci_dev *pdev;
+       u16 devid;
+
+       if (dev->bus != &pci_bus_type)
+               return;
+
+       pdev = to_pci_dev(dev);
+
+       devid = calc_devid(pdev->bus->number, pdev->devfn);
+
+       if (devid > 0)
+               detach_device(domain, devid);
+
+       iommu = amd_iommu_rlookup_table[devid];
+       if (!iommu)
+               return;
+
+       iommu_queue_inv_dev_entry(iommu, devid);
+       iommu_completion_wait(iommu);
+}
+
 #endif