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[v5,12/25] iommu/tegra-smmu: Support DMA domains in tegra

Message ID 12-v5-d0a204c678c7+3d16a-iommu_all_defdom_jgg@nvidia.com (mailing list archive)
State New, archived
Headers show
Series iommu: Make default_domain's mandatory | expand

Commit Message

Jason Gunthorpe July 24, 2023, 5:22 p.m. UTC 
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@nvidia.com>
---
 drivers/iommu/tegra-smmu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index f63f1d4f0bd10f..6cba034905edbf 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);
@@ -989,6 +989,12 @@  static int tegra_smmu_def_domain_type(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,
 	.def_domain_type = &tegra_smmu_def_domain_type,
 	.domain_alloc = tegra_smmu_domain_alloc,