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Subject[PATCH] PCIe hot plug for Intel iommu
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.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>

---
intel-iommu.c | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+)
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 855dd7c..d8b8cfc 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3193,6 +3193,33 @@ 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;
@@ -3245,6 +3272,8 @@ int __init intel_iommu_init(void)

register_iommu(&intel_iommu_ops);

+ bus_register_notifier(&pci_bus_type, &device_nb);
+
return 0;
}


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