intel-iommu: Support PCIe hot-plug

[karo-tx-linux.git] / drivers / pci / intel-iommu.c

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 7fe5f7920caf780a2db9095c5587bbb2345cfd45..1840a0578a429366874ca049d05af748a1f88c09 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3215,6 +3215,33 @@ static int __init init_iommu_sysfs(void)
 }
 #endif /* CONFIG_PM */
 
+/*
+ * Here we only respond to action of unbound device from driver.
+ *
+ * Added device is not attached to its DMAR domain here yet. That will happen
+ * when mapping the device to iova.
+ */
+static int device_notifier(struct notifier_block *nb,
+                                 unsigned long action, void *data)
+{
+       struct device *dev = data;
+       struct pci_dev *pdev = to_pci_dev(dev);
+       struct dmar_domain *domain;
+
+       domain = find_domain(pdev);
+       if (!domain)
+               return 0;
+
+       if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through)
+               domain_remove_one_dev_info(domain, pdev);
+
+       return 0;
+}
+
+static struct notifier_block device_nb = {
+       .notifier_call = device_notifier,
+};
+
 int __init intel_iommu_init(void)
 {
        int ret = 0;
@@ -3267,6 +3294,8 @@ int __init intel_iommu_init(void)
 
        register_iommu(&intel_iommu_ops);
 
+       bus_register_notifier(&pci_bus_type, &device_nb);
+
        return 0;
 }