Commit 43d957b1 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Joerg Roedel
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iommu/tegra-smmu: Respect IOMMU API read-write protections 



Set PTE read/write attributes accordingly to the the protections requested
by IOMMU API.

Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 4f97031f

drivers/iommu/tegra-smmu.c

+10 −3
Original line number Diff line number Diff line
@@ -145,8 +145,6 @@ static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset) 


#define SMMU_PDE_ATTR		(SMMU_PDE_READABLE | SMMU_PDE_WRITABLE | \

				 SMMU_PDE_NONSECURE)

#define SMMU_PTE_ATTR		(SMMU_PTE_READABLE | SMMU_PTE_WRITABLE | \

				 SMMU_PTE_NONSECURE)



static unsigned int iova_pd_index(unsigned long iova)

{
@@ -659,6 +657,7 @@ static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova, 
{

	struct tegra_smmu_as *as = to_smmu_as(domain);

	dma_addr_t pte_dma;

	u32 pte_attrs;

	u32 *pte;



	pte = as_get_pte(as, iova, &pte_dma);
@@ -669,8 +668,16 @@ static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova, 
	if (*pte == 0)

		tegra_smmu_pte_get_use(as, iova);



	pte_attrs = SMMU_PTE_NONSECURE;



	if (prot & IOMMU_READ)

		pte_attrs |= SMMU_PTE_READABLE;



	if (prot & IOMMU_WRITE)

		pte_attrs |= SMMU_PTE_WRITABLE;



	tegra_smmu_set_pte(as, iova, pte, pte_dma,

			   __phys_to_pfn(paddr) | SMMU_PTE_ATTR);

			   __phys_to_pfn(paddr) | pte_attrs);



	return 0;

}

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