[PATCH RFCv1 10/14] iommufd/selftest: Add IOMMU_TEST_OP_MV_CHECK_DEV_ID

[Nicolin Chen]

This allows verifying the ids xarray of struct mock_viommu, and confirming
the correctness of an IOMMU_VIOMMU_SET_DEV_ID call.

Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
 drivers/iommu/iommufd/iommufd_test.h          |  5 +++
 drivers/iommu/iommufd/selftest.c              | 32 +++++++++++++++++++
 tools/testing/selftests/iommu/iommufd.c       |  7 ++++
 tools/testing/selftests/iommu/iommufd_utils.h | 24 ++++++++++++++
 4 files changed, 68 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index e854d3f67205..91af979a0c23 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -22,6 +22,7 @@ enum {
 	IOMMU_TEST_OP_MOCK_DOMAIN_FLAGS,
 	IOMMU_TEST_OP_DIRTY,
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
+	IOMMU_TEST_OP_MV_CHECK_DEVID,
 };
 
 enum {
@@ -127,6 +128,10 @@ struct iommu_test_cmd {
 			__u32 id;
 			__u32 iotlb;
 		} check_iotlb;
+		struct {
+			__u32 idev_id;
+			__u32 dev_id;
+		} check_dev_id;
 	};
 	__u32 last;
 };
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 4caed9304065..b7d0ce3d3659 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -999,6 +999,34 @@ static int iommufd_test_md_check_iotlb(struct iommufd_ucmd *ucmd,
 	return rc;
 }
 
+static int iommufd_test_mv_check_dev_id(struct iommufd_ucmd *ucmd,
+					u32 viommu_id, unsigned int idev_id,
+					u32 dev_id)
+{
+	struct iommufd_device *idev;
+	struct mock_viommu *mv;
+	int rc = 0;
+
+	mv = container_of(iommufd_get_viommu(ucmd, viommu_id),
+			  struct mock_viommu, core);
+	if (IS_ERR(mv))
+		return PTR_ERR(mv);
+
+	idev = iommufd_get_device(ucmd, idev_id);
+	if (IS_ERR(idev)) {
+		rc = PTR_ERR(idev);
+		goto out_put_viommu;
+	}
+
+	if (idev->dev != xa_load(&mv->ids, dev_id))
+		rc = -EINVAL;
+
+	iommufd_put_object(ucmd->ictx, &idev->obj);
+out_put_viommu:
+	iommufd_put_object(ucmd->ictx, &mv->core.obj);
+	return rc;
+}
+
 struct selftest_access {
 	struct iommufd_access *access;
 	struct file *file;
@@ -1484,6 +1512,10 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 		return iommufd_test_md_check_iotlb(ucmd, cmd->id,
 						   cmd->check_iotlb.id,
 						   cmd->check_iotlb.iotlb);
+	case IOMMU_TEST_OP_MV_CHECK_DEVID:
+		return iommufd_test_mv_check_dev_id(ucmd, cmd->id,
+						    cmd->check_dev_id.idev_id,
+						    cmd->check_dev_id.dev_id);
 	case IOMMU_TEST_OP_CREATE_ACCESS:
 		return iommufd_test_create_access(ucmd, cmd->id,
 						  cmd->create_access.flags);
diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index 378fbf00730e..3af5932c227c 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -288,14 +288,21 @@ TEST_F(iommufd_ioas, viommu)
 		test_err_viommu_set_dev_id(EINVAL, dev_id, viommu_id, 1ULL << 32);
 		test_cmd_viommu_set_dev_id(dev_id, viommu_id, 0x99);
 		test_err_viommu_set_dev_id(EBUSY, dev_id, viommu_id, 0x99);
+		test_cmd_viommu_check_dev_id(viommu_id, dev_id, 0x99);
 
 		test_cmd_mock_domain(self->ioas_id, &stdev2, &hwpt2, &device2);
 		test_err_viommu_set_dev_id(EBUSY, device2, viommu_id, 0x99);
 		test_cmd_viommu_set_dev_id(device2, viommu_id, 0xaa);
 		test_err_viommu_set_dev_id(EBUSY, device2, viommu_id, 0xaa);
+		test_cmd_viommu_check_dev_id(viommu_id, dev_id, 0x99);
+		test_cmd_viommu_check_dev_id(viommu_id, device2, 0xaa);
+
 		test_ioctl_destroy(stdev2);
+		test_cmd_viommu_check_dev_id(viommu_id, dev_id, 0x99);
+		test_err_viommu_check_dev_id(ENOENT, viommu_id, device2, 0xaa);
 
 		test_ioctl_destroy(viommu_id);
+		test_err_viommu_check_dev_id(ENOENT, viommu_id, dev_id, 0x99);
 		test_ioctl_destroy(hwpt_id);
 	} else {
 		test_err_viommu_alloc(ENOENT, dev_id, hwpt_id, &viommu_id);
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index 81e9184fd1d5..e926fa289baa 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -731,3 +731,27 @@ static int _test_cmd_viommu_set_dev_id(int fd, __u32 device_id,
 	EXPECT_ERRNO(_errno,                                                 \
 		     _test_cmd_viommu_set_dev_id(self->fd, device_id,        \
 						  viommu_id, virtual_id))
+
+static int _test_cmd_viommu_check_dev_id(int fd, __u32 viommu_id,
+					 __u32 device_id, __u64 virtual_id)
+{
+	struct iommu_test_cmd test_cmd = {
+		.size = sizeof(test_cmd),
+		.op = IOMMU_TEST_OP_MV_CHECK_DEVID,
+		.id = viommu_id,
+		.check_dev_id = {
+			.idev_id = device_id,
+			.dev_id = virtual_id,
+		},
+	};
+	return ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_MV_CHECK_DEVID),
+		     &test_cmd);
+}
+#define test_cmd_viommu_check_dev_id(viommu_id, device_id, expected)    \
+	ASSERT_EQ(0, _test_cmd_viommu_check_dev_id(self->fd, viommu_id, \
+						   device_id, expected))
+
+#define test_err_viommu_check_dev_id(_errno, viommu_id, device_id, expected) \
+	EXPECT_ERRNO(_errno,                                                 \
+		     _test_cmd_viommu_check_dev_id(self->fd, viommu_id,      \
+						  device_id, expected))
-- 
2.43.0