[PATCH 1/2] intel-iommu: PCIe hot plug for Intel iommu - IOMMU API

[Fenghua Yu <fenghua.yu@intel.com>]

We expand existing IOMMU API iommu_detach_device for PCIe hot remove. We don't
need IOMMU API for hot add.

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

 drivers/pci/intel-iommu.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 855dd7c..5c12283 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3559,9 +3559,20 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 static void intel_iommu_detach_device(struct iommu_domain *domain,
 				      struct device *dev)
 {
-	struct dmar_domain *dmar_domain = domain->priv;
+	struct dmar_domain *dmar_domain;
 	struct pci_dev *pdev = to_pci_dev(dev);
 
+	/* If domain=NULL, we'll find a valid domain for the device.*/
+	if (!domain) {
+		dmar_domain = find_domain(pdev);
+		if (!dmar_domain) {
+			printk(KERN_ERR "Can not find IOMMU domain for %s\n",
+			       pci_name(pdev));
+			return;
+		}
+	} else
+		dmar_domain = domain->priv;
+
 	domain_remove_one_dev_info(dmar_domain, pdev);
 }