[PATCH v1 05/16] iommufd/selftest: Support user_data in mock_viommu_alloc

[Nicolin Chen]

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

Signed-off-by: Nicolin Chen <nicol...@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