[PATCH v4 13/13] iommu/arm-smmu-v3-sva: Add check when enabling sva

[Michael Shavit]

SVA domains can only be attached when the master's STEs have a stage 1
domain.

Signed-off-by: Michael Shavit <mshavit at google.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index b615a85e6a54e..e2a91f20f0906 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -499,9 +499,15 @@ int arm_smmu_master_enable_sva(struct arm_smmu_master *master)
 	int ret;
 
 	mutex_lock(&sva_lock);
+
+	if (!master->s1_cfg) {
+		ret = -EBUSY;
+		goto unlock;
+	}
 	ret = arm_smmu_master_sva_enable_iopf(master);
 	if (!ret)
 		master->sva_enabled = true;
+unlock:
 	mutex_unlock(&sva_lock);
 
 	return ret;
-- 
2.41.0.162.gfafddb0af9-goog