[PATCH 08/20] iommu/tegra-smmu: Support DMA domains in tegra

[Jason Gunthorpe]

All ARM64 iommu drivers should support IOMMU_DOMAIN_DMA to enable
dma-iommu.c.

tegra is blocking dma-iommu usage, and also default_domain's, because it
wants an identity translation. This is needed for some device quirk. The
correct way to do this is to support IDENTITY domains and use
ops->def_domain_type() to return IOMMU_DOMAIN_IDENTITY for only the quirky
devices.

Add support for IOMMU_DOMAIN_DMA and force IOMMU_DOMAIN_IDENTITY mode for
everything so no behavior changes.

Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
 drivers/iommu/tegra-smmu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 153ea0b5de8db4..7c301a732db2c0 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -276,7 +276,7 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
 {
 	struct tegra_smmu_as *as;
 
-	if (type != IOMMU_DOMAIN_UNMANAGED)
+	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
 		return NULL;
 
 	as = kzalloc(sizeof(*as), GFP_KERNEL);
@@ -979,6 +979,12 @@ static int tegra_smmu_of_xlate(struct device *dev,
 }
 
 static const struct iommu_ops tegra_smmu_ops = {
+	/*
+	 * FIXME: For now we want to run all translation in IDENTITY mode,
+	 * better would be to have a def_domain_type op do this for just the
+	 * quirky device.
+	 */
+	.default_domain = &tegra_smmu_identity_domain,
 	.identity_domain = &tegra_smmu_identity_domain,
 	.domain_alloc = tegra_smmu_domain_alloc,
 	.probe_device = tegra_smmu_probe_device,
-- 
2.40.0