[PATCH v4 17/17] iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl

[Yi Liu]

From: Nicolin Chen <nicolinc@xxxxxxxxxx>

Add test cases for the IOMMU_HWPT_INVALIDATE ioctl and verify it by using
the new IOMMU_TEST_OP_MD_CHECK_IOTLB.

Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 tools/testing/selftests/iommu/iommufd.c       | 61 +++++++++++++++++++
 tools/testing/selftests/iommu/iommufd_utils.h | 36 +++++++++++
 2 files changed, 97 insertions(+)

diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index c59299248a98..617e11153761 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -116,6 +116,7 @@ TEST_F(iommufd, cmd_length)
 	TEST_LENGTH(iommu_destroy, IOMMU_DESTROY, id);
 	TEST_LENGTH(iommu_hw_info, IOMMU_GET_HW_INFO, __reserved);
 	TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC, __reserved);
+	TEST_LENGTH(iommu_hwpt_invalidate, IOMMU_HWPT_INVALIDATE, out_driver_error_code);
 	TEST_LENGTH(iommu_ioas_alloc, IOMMU_IOAS_ALLOC, out_ioas_id);
 	TEST_LENGTH(iommu_ioas_iova_ranges, IOMMU_IOAS_IOVA_RANGES,
 		    out_iova_alignment);
@@ -271,7 +272,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 	struct iommu_hwpt_selftest data = {
 		.iotlb =  IOMMU_TEST_IOTLB_DEFAULT,
 	};
+	struct iommu_hwpt_invalidate_selftest inv_reqs[2] = {0};
 	uint32_t nested_hwpt_id[2] = {};
+	uint32_t num_inv, driver_error;
 	uint32_t parent_hwpt_id = 0;
 	uint32_t parent_hwpt_id_not_work = 0;
 	uint32_t test_hwpt_id = 0;
@@ -342,6 +345,64 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 		EXPECT_ERRNO(EBUSY,
 			     _test_ioctl_destroy(self->fd, parent_hwpt_id));
 
+		/* hwpt_invalidate only supports a user-managed hwpt (nested) */
+		num_inv = 1;
+		test_err_hwpt_invalidate(EINVAL, parent_hwpt_id, inv_reqs,
+					 sizeof(*inv_reqs), &num_inv, NULL);
+		/* Negative test: structure size sanity */
+		num_inv = 1;
+		test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+					 sizeof(*inv_reqs) + 1, &num_inv,
+					 &driver_error);
+		assert(driver_error == IOMMU_TEST_INVALIDATE_ERR_FETCH);
+
+		num_inv = 1;
+		test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+					 1, &num_inv, &driver_error);
+		assert(driver_error == IOMMU_TEST_INVALIDATE_ERR_FETCH);
+
+		/* Invalidate the 1st iotlb entry but fail the 2nd request */
+		num_inv = 2;
+		inv_reqs[0].iotlb_id = 0;
+		inv_reqs[1].iotlb_id = MOCK_NESTED_DOMAIN_IOTLB_ID_MAX + 1;
+		test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+					 sizeof(*inv_reqs), &num_inv,
+					 &driver_error);
+		assert(num_inv == 1);
+		assert(driver_error == IOMMU_TEST_INVALIDATE_ERR_REQ);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0, 0);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 1,
+					  IOMMU_TEST_IOTLB_DEFAULT);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 2,
+					  IOMMU_TEST_IOTLB_DEFAULT);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 3,
+					  IOMMU_TEST_IOTLB_DEFAULT);
+
+		/* Invalidate the 2nd iotlb entry and verify */
+		num_inv = 1;
+		inv_reqs[0].iotlb_id = 1;
+		test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+					 sizeof(*inv_reqs), &num_inv);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0, 0);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 1, 0);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 2,
+					  IOMMU_TEST_IOTLB_DEFAULT);
+		test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 3,
+					  IOMMU_TEST_IOTLB_DEFAULT);
+		/* Invalidate the 3rd and 4th iotlb entries and verify */
+		num_inv = 2;
+		inv_reqs[0].iotlb_id = 2;
+		inv_reqs[1].iotlb_id = 3;
+		test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+					 sizeof(*inv_reqs), &num_inv);
+		test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[0], 0);
+		/* Invalidate all iotlb entries for nested_hwpt_id[1] and verify */
+		num_inv = 1;
+		inv_reqs[0].flags = IOMMU_TEST_INVALIDATE_ALL;
+		test_cmd_hwpt_invalidate(nested_hwpt_id[1], inv_reqs,
+					 sizeof(*inv_reqs), &num_inv);
+		test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[1], 0);
+
 		/* Attach device to nested_hwpt_id[0] that then will be busy */
 		test_cmd_mock_domain_replace(self->stdev_id,
 					     nested_hwpt_id[0]);
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index 2bc41e9a69e8..55906c5da1a9 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -169,6 +169,42 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
 			test_cmd_hwpt_check_iotlb(hwpt_id, i, expected);       \
 	})
 
+static int _test_cmd_hwpt_invalidate(int fd, __u32 hwpt_id, void *reqs,
+				     uint32_t lreq, uint32_t *nreqs,
+				     uint32_t *driver_error)
+{
+	struct iommu_hwpt_invalidate cmd = {
+		.size = sizeof(cmd),
+		.hwpt_id = hwpt_id,
+		.reqs_uptr = (uint64_t)reqs,
+		.req_len = lreq,
+		.req_num = *nreqs,
+	};
+	int rc = ioctl(fd, IOMMU_HWPT_INVALIDATE, &cmd);
+	*nreqs = cmd.req_num;
+	if (driver_error)
+		*driver_error = cmd.out_driver_error_code;
+	return rc;
+}
+
+#define test_cmd_hwpt_invalidate(hwpt_id, reqs, lreq, nreqs)                 \
+	({                                                                   \
+		uint32_t error, num = *nreqs;                                \
+		ASSERT_EQ(0,                                                 \
+			  _test_cmd_hwpt_invalidate(self->fd, hwpt_id, reqs, \
+						    lreq, nreqs, &error));   \
+		assert(num == *nreqs);                                       \
+		assert(error == 0);                                          \
+	})
+#define test_err_hwpt_invalidate(_errno, hwpt_id, reqs, lreq, nreqs,      \
+				 driver_error)                            \
+	({                                                                \
+		EXPECT_ERRNO(_errno,                                      \
+			     _test_cmd_hwpt_invalidate(self->fd, hwpt_id, \
+						       reqs, lreq, nreqs, \
+						       driver_error));    \
+	})
+
 static int _test_cmd_access_replace_ioas(int fd, __u32 access_id,
 					 unsigned int ioas_id)
 {
-- 
2.34.1