[PATCH 2/4] iommu/tegra-smmu: Add iommu_group support

[Robin Murphy]

As the last step to making groups mandatory, clean up the remaining
drivers by adding basic support. Whilst it may not perfectly reflect
the isolation capabilities of the hardware (tegra_smmu_swgroup sounds
suspiciously like something that might warrant representing at the
iommu_group level), using generic_device_group() should at least
maintain existing behaviour with respect to the API.

Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
 drivers/iommu/tegra-smmu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index eeb19f560a05..faa9c1e70482 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -704,6 +704,7 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
 static int tegra_smmu_add_device(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
+	struct iommu_group *group;
 	struct of_phandle_args args;
 	unsigned int index = 0;
 
@@ -725,12 +726,19 @@ static int tegra_smmu_add_device(struct device *dev)
 		index++;
 	}
 
+	group = iommu_group_get_for_dev(dev);
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	iommu_group_put(group);
+
 	return 0;
 }
 
 static void tegra_smmu_remove_device(struct device *dev)
 {
 	dev->archdata.iommu = NULL;
+	iommu_group_remove_device(dev);
 }
 
 static const struct iommu_ops tegra_smmu_ops = {
@@ -741,6 +749,7 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.detach_dev = tegra_smmu_detach_dev,
 	.add_device = tegra_smmu_add_device,
 	.remove_device = tegra_smmu_remove_device,
+	.device_group = generic_device_group,
 	.map = tegra_smmu_map,
 	.unmap = tegra_smmu_unmap,
 	.map_sg = default_iommu_map_sg,
-- 
2.12.2.dirty