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Commit bdf95923 authored by Sunil Goutham's avatar Sunil Goutham Committed by Joerg Roedel
Browse files

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: default avatarSunil Goutham <sgoutham@cavium.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 6323f474

drivers/iommu/arm-smmu-v3.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

drivers/iommu/arm-smmu.c

+3 −0
Original line number Diff line number Diff line
@@ -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;