The ARM SMMU drivers provide a DOMAIN_ATTR_NESTING domain attribute,
which allows callers of the IOMMU API to request that the page table
for a domain is installed at stage-2, if supported by the hardware.
Since setting this attribute only makes sense for UNMANAGED domains,
this patch returns -ENODEV if the domain_{get,set}_attr operations are
called on other domain types.
Signed-off-by: Will Deacon <will.dea...@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 6 ++++++
drivers/iommu/arm-smmu.c | 6 ++++++
2 files changed, 12 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 4d6ec444a9d6..c254325b0c7a 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1839,6 +1839,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -ENODEV;
+
switch (attr) {
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
@@ -1854,6 +1857,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain
*domain,
int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -ENODEV;
+
mutex_lock(&smmu_domain->init_mutex);
switch (attr) {
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a60cded8a6ed..a328ffb75509 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1497,6 +1497,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -ENODEV;
+
switch (attr) {
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
@@ -1512,6 +1515,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain
*domain,
int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -ENODEV;
+
mutex_lock(&smmu_domain->init_mutex);
switch (attr) {
--
2.1.4
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