diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2018-03-26 13:35:15 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-03-27 14:12:06 +0100 |
| commit | dcd189e6d2eca4663da6120463fbff0995bc06eb (patch) | |
| tree | 8f73c5208f0ea272a81325421de7c8582c02d40e /drivers/iommu | |
| parent | 6619c9138533597dc0ff52155d263f14e8578ca2 (diff) | |
| download | linux-dcd189e6d2eca4663da6120463fbff0995bc06eb.tar.bz2 | |
iommu/arm-smmu-v3: Support 52-bit virtual address
Stage 1 input addresses are effectively 64-bit in SMMUv3 anyway, so
really all that's involved is letting io-pgtable know the appropriate
upper bound for T0SZ.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index b73a5950eb65..1d647104bccc 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -92,6 +92,8 @@ #define IDR5_OAS_44_BIT 4 #define IDR5_OAS_48_BIT 5 #define IDR5_OAS_52_BIT 6 +#define IDR5_VAX GENMASK(11, 10) +#define IDR5_VAX_52_BIT 1 #define ARM_SMMU_CR0 0x20 #define CR0_CMDQEN (1 << 3) @@ -551,6 +553,7 @@ struct arm_smmu_device { #define ARM_SMMU_FEAT_STALLS (1 << 11) #define ARM_SMMU_FEAT_HYP (1 << 12) #define ARM_SMMU_FEAT_STALL_FORCE (1 << 13) +#define ARM_SMMU_FEAT_VAX (1 << 14) u32 features; #define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0) @@ -1591,7 +1594,8 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain) switch (smmu_domain->stage) { case ARM_SMMU_DOMAIN_S1: - ias = VA_BITS; + ias = (smmu->features & ARM_SMMU_FEAT_VAX) ? 52 : 48; + ias = min_t(unsigned long, ias, VA_BITS); oas = smmu->ias; fmt = ARM_64_LPAE_S1; finalise_stage_fn = arm_smmu_domain_finalise_s1; @@ -2645,6 +2649,10 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) if (reg & IDR5_GRAN4K) smmu->pgsize_bitmap |= SZ_4K | SZ_2M | SZ_1G; + /* Input address size */ + if (FIELD_GET(IDR5_VAX, reg) == IDR5_VAX_52_BIT) + smmu->features |= ARM_SMMU_FEAT_VAX; + /* Output address size */ switch (FIELD_GET(IDR5_OAS, reg)) { case IDR5_OAS_32_BIT: |