redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

iommu/arm-smmu: add support for IOMMU_EXEC

Browse source 
Previously, all of our mappings were marked as executable, which isn't
usually required. Now that we have the IOMMU_EXEC flag, use that to
determine whether or not a mapping should be marked as executable.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2013-11-05 16:32:00 +00:00
parent ca13bb3d4e
commit cf2d45b19d
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/iommu/arm-smmu.c
View file

@ -61,12 +61,13 @@
#define ARM_SMMU_GR1(smmu) ((smmu)->base + (smmu)->pagesize)
/* Page table bits */
#define ARM_SMMU_PTE_PAGE (((pteval_t)3) << 0)
#define ARM_SMMU_PTE_XN (((pteval_t)3) << 53)
#define ARM_SMMU_PTE_CONT (((pteval_t)1) << 52)
#define ARM_SMMU_PTE_AF (((pteval_t)1) << 10)
#define ARM_SMMU_PTE_SH_NS (((pteval_t)0) << 8)
#define ARM_SMMU_PTE_SH_OS (((pteval_t)2) << 8)
#define ARM_SMMU_PTE_SH_IS (((pteval_t)3) << 8)
#define ARM_SMMU_PTE_PAGE (((pteval_t)3) << 0)
#if PAGE_SIZE == SZ_4K
#define ARM_SMMU_PTE_CONT_ENTRIES 16
@ -1205,7 +1206,7 @@ static int arm_smmu_alloc_init_pte(struct arm_smmu_device *smmu, pmd_t *pmd,
unsigned long pfn, int flags, int stage)
{
pte_t *pte, *start;
pteval_t pteval = ARM_SMMU_PTE_PAGE | ARM_SMMU_PTE_AF;
pteval_t pteval = ARM_SMMU_PTE_PAGE | ARM_SMMU_PTE_AF | ARM_SMMU_PTE_XN;
if (pmd_none(*pmd)) {
/* Allocate a new set of tables */
@ -1244,7 +1245,9 @@ static int arm_smmu_alloc_init_pte(struct arm_smmu_device *smmu, pmd_t *pmd,
}
/* If no access, create a faulting entry to avoid TLB fills */
if (!(flags & (IOMMU_READ | IOMMU_WRITE)))
if (flags & IOMMU_EXEC)
pteval &= ~ARM_SMMU_PTE_XN;
else if (!(flags & (IOMMU_READ | IOMMU_WRITE)))
pteval &= ~ARM_SMMU_PTE_PAGE;
pteval |= ARM_SMMU_PTE_SH_IS;