Under some condition, user want to use the
only stage 2 translation ability, so smmu
driver need support setting only s2 domain
attribute.
Signed-off-by: Rick Song <songwenjun@xxxxxxxxxx>
---
drivers/iommu/arm-smmu-v3.c | 12 ++++++++++++
include/linux/iommu.h | 1 +
2 files changed, 13 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 15c01c3..d3b19d2 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1854,6 +1854,18 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
mutex_lock(&smmu_domain->init_mutex);
switch (attr) {
+ case DOMAIN_ATTR_S2:
+ if (smmu_domain->smmu) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+
+ if (*(int *)data)
+ smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
+ else
+ smmu_domain->stage = ARM_SMMU_DOMAIN_S1;
+
+ break;
case DOMAIN_ATTR_NESTING:
if (smmu_domain->smmu) {
ret = -EPERM;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 436dc21..0b5a387 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -114,6 +114,7 @@ enum iommu_attr {
DOMAIN_ATTR_FSL_PAMU_ENABLE,
DOMAIN_ATTR_FSL_PAMUV1,
DOMAIN_ATTR_NESTING, /* two stages of translation */
+ DOMAIN_ATTR_S2, /* only stage 2 translation */
DOMAIN_ATTR_MAX,
};
--
1.9.1
--
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