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Subject[PATCH v1 3/3] iommu/tegra-smmu: Respect IOMMU API read-write protections
Date
Set PTE read/write attributes accordingly to the the protections requested
by IOMMU API.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/iommu/tegra-smmu.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 27b1249f0773..463ee08f7d3a 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -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;
}
--
2.20.1
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