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authorFenghua Yu <fenghua.yu@intel.com>2009-11-11 07:23:06 -0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-11-12 02:28:45 +0000
commit99dcadede42f8898d4c963ef69192ef4b9b76ba8 (patch)
tree36db26e700bfa17f56a30ef05b4092372149e147
parente8bb910d1bbc65e7081e73aab4b3a3dd8630332c (diff)
intel-iommu: Support PCIe hot-plug
To support PCIe hot plug in IOMMU, we register a notifier to respond to device change action. When the notifier gets BUS_NOTIFY_UNBOUND_DRIVER, it removes the device from its DMAR domain. A hot added device will be added into an IOMMU domain when it first does IOMMU op. So there is no need to add more code for hot add. Without the patch, after a hot-remove, a hot-added device on the same slot will not work. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Tested-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/pci/intel-iommu.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 7fe5f7920caf..1840a0578a42 100644
--- 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;
}