[PATCH v2 06/22] iommufd/selftest: Support user_data in mock_viommu_alloc

Nicolin Chen
2025-04-26T07:22:42Z

Add a simple user_data for an input-to-output loopback test.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
drivers/iommu/iommufd/iommufd_test.h | 13 +++++++++++++
drivers/iommu/iommufd/selftest.c | 19 +++++++++++++++++++
2 files changed, 32 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 1cd7e8394129..fbf9ecb35a13 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -227,6 +227,19 @@ struct iommu_hwpt_invalidate_selftest {

#define IOMMU_VIOMMU_TYPE_SELFTEST 0xdeadbeef

+/**
+ * struct iommu_viommu_selftest - vIOMMU data for Mock driver
+ * (IOMMU_VIOMMU_TYPE_SELFTEST)
+ * @in_data: Input random data from user space
+ * @out_data: Output data (matching @in_data) to user space
+ *
+ * Simply set @out_data=@in_data for a loopback test
+ */
+struct iommu_viommu_selftest {
+ __u32 in_data;
+ __u32 out_data;
+};
+
/* Should not be equal to any defined value in enum iommu_viommu_invalidate_data_type */
#define IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST 0xdeadbeef
#define IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST_INVALID 0xdadbeef
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 8b8ba4fb91cd..b04bd2fbc53d 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -740,16 +740,35 @@ mock_viommu_alloc(struct device *dev, struct iommu_domain *domain,
{
struct mock_iommu_device *mock_iommu =
iommu_get_iommu_dev(dev, struct mock_iommu_device, iommu_dev);
+ struct iommu_viommu_selftest data;
struct mock_viommu *mock_viommu;
+ int rc;

if (viommu_type != IOMMU_VIOMMU_TYPE_SELFTEST)
return ERR_PTR(-EOPNOTSUPP);

+ if (user_data) {
+ rc = iommu_copy_struct_from_user(
+ &data, user_data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
+ if (rc)
+ return ERR_PTR(rc);
+ }
+
mock_viommu = iommufd_viommu_alloc(ictx, struct mock_viommu, core,
&mock_viommu_ops);
if (IS_ERR(mock_viommu))
return ERR_CAST(mock_viommu);

+ if (user_data) {
+ data.out_data = data.in_data;
+ rc = iommu_copy_struct_to_user(
+ user_data, &data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
+ if (rc) {
+ iommufd_struct_destroy(ictx, mock_viommu, core);
+ return ERR_PTR(rc);
+ }
+ }
+
refcount_inc(&mock_iommu->users);
return &mock_viommu->core;
}
--
2.43.0