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iommu/tegra-smmu: Add iommu_group support

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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@arm.com>
Tested-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2017-07-21 13:12:36 +01:00 committed by Joerg Roedel
parent ce2eb8f44e
commit d92e1f8498
1 changed files with 9 additions and 0 deletions
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9
drivers/iommu/tegra-smmu.c
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@ -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,