linux-kernel - [PATCH v1 05/16] iommufd/selftest: Support user_data in mock_viommu

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Message-ID: <05aa9acfafa0d92f76c9394d49a9a5c7b29ae94a.1744353300.git.nicolinc@nvidia.com>
Date: Thu, 10 Apr 2025 23:37:44 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <corbet@....net>,
	<will@...nel.org>
CC: <robin.murphy@....com>, <joro@...tes.org>, <thierry.reding@...il.com>,
	<vdumpa@...dia.com>, <jonathanh@...dia.com>, <shuah@...nel.org>,
	<praan@...gle.com>, <nathan@...nel.org>, <peterz@...radead.org>,
	<yi.l.liu@...el.com>, <jsnitsel@...hat.com>, <mshavit@...gle.com>,
	<zhangzekun11@...wei.com>, <iommu@...ts.linux.dev>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>
Subject: [PATCH v1 05/16] iommufd/selftest: Support user_data in mock_viommu_alloc

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

Signed-off-by: Nicolin Chen <nicolinc@...dia.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=@...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