iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed (bdf95923) · Commits · 戴 / test

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>

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;

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