diff options
| author | Will Deacon <will.deacon@arm.com> | 2015-08-20 13:12:32 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-09-22 18:36:04 +0200 |
| commit | f0c453dbcce7767cd868deb809ba68083c93954e (patch) | |
| tree | f129889801deafa68ad7ae6caa2ed454bdba3b48 /drivers/iommu | |
| parent | iommu/io-pgtable-arm: Don't use dma_to_phys() (diff) | |
| download | linux-f0c453dbcce7767cd868deb809ba68083c93954e.tar.xz linux-f0c453dbcce7767cd868deb809ba68083c93954e.zip | |
iommu/arm-smmu: Ensure IAS is set correctly for AArch32-capable SMMUs
AArch32-capable SMMU implementations have a minimum IAS of 40 bits, so
ensure that is reflected in the stage-2 page table configuration.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index dafaf59dc3b8..a24f359fa0d0 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -56,6 +56,7 @@ #define IDR0_TTF_SHIFT 2 #define IDR0_TTF_MASK 0x3 #define IDR0_TTF_AARCH64 (2 << IDR0_TTF_SHIFT) +#define IDR0_TTF_AARCH32_64 (3 << IDR0_TTF_SHIFT) #define IDR0_S1P (1 << 1) #define IDR0_S2P (1 << 0) @@ -2460,7 +2461,13 @@ static int arm_smmu_device_probe(struct arm_smmu_device *smmu) } /* We only support the AArch64 table format at present */ - if ((reg & IDR0_TTF_MASK << IDR0_TTF_SHIFT) < IDR0_TTF_AARCH64) { + switch (reg & IDR0_TTF_MASK << IDR0_TTF_SHIFT) { + case IDR0_TTF_AARCH32_64: + smmu->ias = 40; + /* Fallthrough */ + case IDR0_TTF_AARCH64: + break; + default: dev_err(smmu->dev, "AArch64 table format not supported!\n"); return -ENXIO; } @@ -2541,8 +2548,7 @@ static int arm_smmu_device_probe(struct arm_smmu_device *smmu) dev_warn(smmu->dev, "failed to set DMA mask for table walker\n"); - if (!smmu->ias) - smmu->ias = smmu->oas; + smmu->ias = max(smmu->ias, smmu->oas); dev_info(smmu->dev, "ias %lu-bit, oas %lu-bit (features 0x%08x)\n", smmu->ias, smmu->oas, smmu->features); |