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iommu/arm-smmu: prefer stage-1 mappings where we have a choice 

For an SMMU that supports both Stage-1 and Stage-2 mappings (but not
nested translation), then we should prefer stage-1 mappings as we
otherwise rely on the memory attributes of the incoming transactions
for IOMMU_CACHE mappings.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-06-25 12:12:41 +01:00
parent 44680eedf9
commit 9c5c92e35c
1 changed files with 4 additions and 4 deletions
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8
drivers/iommu/arm-smmu.c
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@ -876,12 +876,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
*/ */
cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS; cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS;
start = smmu->num_s2_context_banks; start = smmu->num_s2_context_banks;
} else if (smmu->features & ARM_SMMU_FEAT_TRANS_S2) { } else if (smmu->features & ARM_SMMU_FEAT_TRANS_S1) {
cfg->cbar = CBAR_TYPE_S2_TRANS;
start = 0;
} else {
cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS; cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS;
start = smmu->num_s2_context_banks; start = smmu->num_s2_context_banks;
} else {
cfg->cbar = CBAR_TYPE_S2_TRANS;
start = 0;
} }
ret = __arm_smmu_alloc_bitmap(smmu->context_map, start, ret = __arm_smmu_alloc_bitmap(smmu->context_map, start,