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: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files 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;
 }