[RFC PATCH 03/10] iommu/vt-d: Allocate groups for mediated devices

[Lu Baolu]

With the Intel IOMMU supporting PASID granularity isolation and
protection, a mediated device could be isolated and protected by
an IOMMU unit. We need to allocate a new group instead of a PCI
group.

Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Liu Yi L <yi.l.liu@xxxxxxxxx>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/intel-iommu.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 3ede34a..57ccfc4 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5276,6 +5276,17 @@ static void intel_iommu_put_resv_regions(struct device *dev,
 	}
 }
 
+static struct iommu_group *intel_iommu_device_group(struct device *dev)
+{
+	if (dev_is_pci(dev))
+		return pci_device_group(dev);
+
+	if (dev_is_mdev(dev))
+		return iommu_group_alloc();
+
+	return ERR_PTR(-EINVAL);
+}
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
 {
@@ -5370,7 +5381,7 @@ const struct iommu_ops intel_iommu_ops = {
 	.remove_device		= intel_iommu_remove_device,
 	.get_resv_regions	= intel_iommu_get_resv_regions,
 	.put_resv_regions	= intel_iommu_put_resv_regions,
-	.device_group		= pci_device_group,
+	.device_group		= intel_iommu_device_group,
 	.pgsize_bitmap		= INTEL_IOMMU_PGSIZES,
 };
 
-- 
2.7.4