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iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed 

For software initiated address translation, when domain type is
IOMMU_DOMAIN_IDENTITY i.e SMMU is bypassed, mimic HW behavior
i.e return the same IOVA as translated address.

This patch is an extension to Will Deacon's patchset
"Implement SMMU passthrough using the default domain".

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sunil Goutham 2017-04-25 15:27:52 +05:30 committed by Joerg Roedel
parent 6323f47490
commit bdf9592308
2 changed files with 6 additions and 0 deletions
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3
drivers/iommu/arm-smmu-v3.c
View File

@ -1714,6 +1714,9 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
if (domain->type == IOMMU_DOMAIN_IDENTITY)
return iova;
if (!ops)
return 0;

3
drivers/iommu/arm-smmu.c
View File

@ -1459,6 +1459,9 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
if (domain->type == IOMMU_DOMAIN_IDENTITY)
return iova;
if (!ops)
return 0;