diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2023-05-10 17:38:45 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-06-08 22:58:12 +0200 |
| commit | 1d9777b9f3d55b4b6faf186ba4f1d6fb560c0523 (patch) | |
| tree | 5e61960c5f579d53f92e58a0eaf855d5e0611d4d /drivers/iommu | |
| parent | iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 (diff) | |
| download | linux-1d9777b9f3d55b4b6faf186ba4f1d6fb560c0523.tar.xz linux-1d9777b9f3d55b4b6faf186ba4f1d6fb560c0523.zip | |
iommu/arm-smmu-v3: Add explicit feature for nesting
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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 | ||||
| -rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index b0ccd735f8bb..7e08ec55df2a 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -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)) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 1555c8220381..dcab85698a4e 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -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) |