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iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains
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.deacon@arm.com>
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@ -1837,6 +1837,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
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{
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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if (domain->type != IOMMU_DOMAIN_UNMANAGED)
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return -EINVAL;
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switch (attr) {
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case DOMAIN_ATTR_NESTING:
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*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
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@ -1852,6 +1855,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
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int ret = 0;
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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if (domain->type != IOMMU_DOMAIN_UNMANAGED)
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return -EINVAL;
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mutex_lock(&smmu_domain->init_mutex);
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switch (attr) {
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@ -1603,6 +1603,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
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{
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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if (domain->type != IOMMU_DOMAIN_UNMANAGED)
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return -EINVAL;
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switch (attr) {
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case DOMAIN_ATTR_NESTING:
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*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
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@ -1618,6 +1621,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
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int ret = 0;
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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if (domain->type != IOMMU_DOMAIN_UNMANAGED)
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return -EINVAL;
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mutex_lock(&smmu_domain->init_mutex);
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switch (attr) {
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