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iommu/arm-smmu-v3: Add explicit feature for nesting

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In certain cases we may want to refuse to allow nested translation even
when both stages are implemented, so let's add an explicit feature for
nesting support which we can control in its own right. For now this
merely serves as documentation, but it means a nice convenient check
will be ready and waiting for the future nesting code.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/136c3f4a3a84cc14a5a1978ace57dfd3ed67b688.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2023-05-10 16:38:45 +01:00 committed by Will Deacon
parent 309a15cb16
commit 1d9777b9f3
2 changed files with 5 additions and 0 deletions
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4
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -3674,6 +3674,10 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
smmu->ias = max(smmu->ias, smmu->oas);
if ((smmu->features & ARM_SMMU_FEAT_TRANS_S1) &&
(smmu->features & ARM_SMMU_FEAT_TRANS_S2))
smmu->features |= ARM_SMMU_FEAT_NESTING;
arm_smmu_device_iidr_probe(smmu);
if (arm_smmu_sva_supported(smmu))

1
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
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@ -645,6 +645,7 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_BTM (1 << 16)
#define ARM_SMMU_FEAT_SVA (1 << 17)
#define ARM_SMMU_FEAT_E2H (1 << 18)
#define ARM_SMMU_FEAT_NESTING (1 << 19)
u32 features;
#define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0)