[PATCH 16/17] iommufd/selftest: Add IOMMU_TEST_OP_MD_CHECK_IOTLB test op

[Yi Liu]

From: Nicolin Chen <nicolinc@xxxxxxxxxx>

This allows to test whether IOTLB has been invalidated or not.

Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/iommu/iommufd/iommufd_test.h          |  4 +++
 drivers/iommu/iommufd/selftest.c              | 22 +++++++++++++++
 tools/testing/selftests/iommu/iommufd_utils.h | 27 +++++++++++++++----
 3 files changed, 48 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 842b81397a2a..5998c63a89f2 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -13,6 +13,7 @@ enum {
 	IOMMU_TEST_OP_MOCK_DOMAIN_REPLACE,
 	IOMMU_TEST_OP_MD_CHECK_MAP,
 	IOMMU_TEST_OP_MD_CHECK_REFS,
+	IOMMU_TEST_OP_MD_CHECK_IOTLB,
 	IOMMU_TEST_OP_CREATE_ACCESS,
 	IOMMU_TEST_OP_ACCESS_SET_IOAS,
 	IOMMU_TEST_OP_DESTROY_ACCESS_PAGES,
@@ -68,6 +69,9 @@ struct iommu_test_cmd {
 			__aligned_u64 uptr;
 			__u32 refs;
 		} check_refs;
+		struct {
+			__u32 iotlb;
+		} check_iotlb;
 		struct {
 			__u32 out_access_fd;
 			__u32 flags;
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 354a0054afad..21134000bc78 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -536,6 +536,25 @@ static int iommufd_test_md_check_refs(struct iommufd_ucmd *ucmd,
 	return 0;
 }
 
+static int iommufd_test_md_check_iotlb(struct iommufd_ucmd *ucmd,
+				       u32 mockpt_id, u32 iotlb)
+{
+	struct iommufd_hw_pagetable *hwpt;
+	struct mock_iommu_domain *mock;
+	int rc = 0;
+
+	hwpt = get_md_pagetable(ucmd, mockpt_id, &mock);
+	if (IS_ERR(hwpt))
+		return PTR_ERR(hwpt);
+
+	mock = container_of(hwpt->domain, struct mock_iommu_domain, domain);
+
+	if (iotlb != mock->iotlb)
+		rc = -EINVAL;
+	iommufd_put_object(&hwpt->obj);
+	return rc;
+}
+
 struct selftest_access {
 	struct iommufd_access *access;
 	struct file *file;
@@ -950,6 +969,9 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 		return iommufd_test_md_check_refs(
 			ucmd, u64_to_user_ptr(cmd->check_refs.uptr),
 			cmd->check_refs.length, cmd->check_refs.refs);
+	case IOMMU_TEST_OP_MD_CHECK_IOTLB:
+		return iommufd_test_md_check_iotlb(ucmd, cmd->id,
+						   cmd->check_iotlb.iotlb);
 	case IOMMU_TEST_OP_CREATE_ACCESS:
 		return iommufd_test_create_access(ucmd,
 						  cmd->create_access.flags);
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index cb8a5e3beca6..ea61b81fbc52 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -189,6 +189,20 @@ static int _test_ioctl_ioas_alloc(int fd, __u32 *id)
 		ASSERT_NE(0, *(id));                                \
 	})
 
+#define test_ioctl_hwpt_check_iotlb(hwpt_id, expected)                         \
+	({                                                                     \
+		struct iommu_test_cmd test_cmd = {                             \
+			.size = sizeof(test_cmd),                              \
+			.op = IOMMU_TEST_OP_MD_CHECK_IOTLB,                    \
+			.id = hwpt_id,                                         \
+			.check_iotlb = { .iotlb = expected },                  \
+		};                                                             \
+		ASSERT_EQ(0,                                                   \
+			  ioctl(self->fd,                                      \
+				_IOMMU_TEST_CMD(IOMMU_TEST_OP_MD_CHECK_IOTLB), \
+				&test_cmd));                                   \
+	})
+
 static int _test_ioctl_hwpt_alloc(int fd, __u32 pt_id, __u32 dev_id,
 				  __u32 *out_hwpt_id, bool nested)
 {
@@ -213,11 +227,14 @@ static int _test_ioctl_hwpt_alloc(int fd, __u32 pt_id, __u32 dev_id,
 	return 0;
 }
 
-#define test_ioctl_hwpt_alloc(pt_id, dev_id, out_hwpt_id, nested)            \
-	({                                                                   \
-		ASSERT_EQ(0, _test_ioctl_hwpt_alloc(self->fd, pt_id, dev_id, \
-						    out_hwpt_id, nested));   \
-		ASSERT_NE(0, *(out_hwpt_id));                                \
+#define test_ioctl_hwpt_alloc(pt_id, dev_id, out_hwpt_id, nested)              \
+	({                                                                     \
+		ASSERT_EQ(0, _test_ioctl_hwpt_alloc(self->fd, pt_id, dev_id,   \
+						    out_hwpt_id, nested));     \
+		ASSERT_NE(0, *(out_hwpt_id));                                  \
+		if (nested)                                                    \
+			test_ioctl_hwpt_check_iotlb(*(out_hwpt_id),            \
+						    IOMMU_TEST_IOTLB_DEFAULT); \
 	})
 #define test_err_ioctl_hwpt_alloc(_errno, pt_id, dev_id, out_hwpt_id, nested) \
 	({                                                                    \
-- 
2.34.1