diff mbox series

[v6,04/25] iommufd/selftest: Support user_data in mock_viommu_alloc

Message ID 276c060cd102c34fa19411df5a9ea637b071cf8b.1749884998.git.nicolinc@nvidia.com
State New
Headers show
Series iommufd: Add vIOMMU infrastructure (Part-4 HW QUEUE) | expand

Commit Message

Nicolin Chen June 14, 2025, 7:14 a.m. UTC 
Add a simple user_data for an input-to-output loopback test.

Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/iommufd/iommufd_test.h | 13 +++++++++++++
 drivers/iommu/iommufd/selftest.c     | 15 +++++++++++++++
 2 files changed, 28 insertions(+)
diff mbox series

Patch

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 e09fa859c359..6bd1816e0794 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -783,6 +783,21 @@  static int mock_viommu_init(struct iommufd_viommu *viommu,
 {
 	struct mock_iommu_device *mock_iommu = container_of(
 		viommu->iommu_dev, struct mock_iommu_device, iommu_dev);
+	struct iommu_viommu_selftest data;
+	int rc;
+
+	if (user_data) {
+		rc = iommu_copy_struct_from_user(
+			&data, user_data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
+		if (rc)
+			return rc;
+
+		data.out_data = data.in_data;
+		rc = iommu_copy_struct_to_user(
+			user_data, &data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
+		if (rc)
+			return rc;
+	}
 
 	refcount_inc(&mock_iommu->users);
 	viommu->ops = &mock_viommu_ops;