[PATCH v4 2/6] iommu/io-pgtable-arm: add support for the IOMMU_PRIV flag

Mitchel Humpherys
2016-07-25T19:16:33Z

From: Jeremy Gebben <jgebben@codeaurora.org>

Allow the creation of privileged mode mappings, for stage 1 only.

Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
---

Notes:
v2..v3

- Use existing bit definitions.

drivers/iommu/io-pgtable-arm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index f5c90e1366ce..69ba83a135f1 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -350,11 +350,14 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,

if (data->iop.fmt == ARM_64_LPAE_S1 ||
data->iop.fmt == ARM_32_LPAE_S1) {
- pte = ARM_LPAE_PTE_AP_UNPRIV | ARM_LPAE_PTE_nG;
+ pte = ARM_LPAE_PTE_nG;

if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
pte |= ARM_LPAE_PTE_AP_RDONLY;

+ if (!(prot & IOMMU_PRIV))
+ pte |= ARM_LPAE_PTE_AP_UNPRIV;
+
if (prot & IOMMU_MMIO)
pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);