iommufd/selftest: Add coverage for IOPF test

Extend the selftest tool to add coverage of testing IOPF handling. This
would include the following tests:

- Allocating and destroying an iommufd fault object.
- Allocating and destroying an IOPF-capable HWPT.
- Attaching/detaching/replacing an IOPF-capable HWPT on a device.
- Triggering an IOPF on the mock device.
- Retrieving and responding to the IOPF through the file interface.

Link: https://lore.kernel.org/r/20240702063444.105814-11-baolu.lu@linux.intel.comSigned-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

tools/testing/selftests/iommu/iommufd.c

@@ -279,6 +279,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 	uint32_t parent_hwpt_id = 0;
 	uint32_t parent_hwpt_id_not_work = 0;
 	uint32_t test_hwpt_id = 0;
+	uint32_t iopf_hwpt_id;
+	uint32_t fault_id;
+	uint32_t fault_fd;
 
 	if (self->device_id) {
 		/* Negative tests */
@@ -326,6 +329,7 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 					   sizeof(data));
 
 		/* Allocate two nested hwpts sharing one common parent hwpt */
+		test_ioctl_fault_alloc(&fault_id, &fault_fd);
 		test_cmd_hwpt_alloc_nested(self->device_id, parent_hwpt_id, 0,
 					   &nested_hwpt_id[0],
 					   IOMMU_HWPT_DATA_SELFTEST, &data,
@@ -334,6 +338,14 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 					   &nested_hwpt_id[1],
 					   IOMMU_HWPT_DATA_SELFTEST, &data,
 					   sizeof(data));
+		test_err_hwpt_alloc_iopf(ENOENT, self->device_id, parent_hwpt_id,
+					 UINT32_MAX, IOMMU_HWPT_FAULT_ID_VALID,
+					 &iopf_hwpt_id, IOMMU_HWPT_DATA_SELFTEST,
+					 &data, sizeof(data));
+		test_cmd_hwpt_alloc_iopf(self->device_id, parent_hwpt_id, fault_id,
+					 IOMMU_HWPT_FAULT_ID_VALID, &iopf_hwpt_id,
+					 IOMMU_HWPT_DATA_SELFTEST, &data,
+					 sizeof(data));
 		test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[0],
 					      IOMMU_TEST_IOTLB_DEFAULT);
 		test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[1],
@@ -504,14 +516,24 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
 			     _test_ioctl_destroy(self->fd, nested_hwpt_id[1]));
 		test_ioctl_destroy(nested_hwpt_id[0]);
 
+		/* Switch from nested_hwpt_id[1] to iopf_hwpt_id */
+		test_cmd_mock_domain_replace(self->stdev_id, iopf_hwpt_id);
+		EXPECT_ERRNO(EBUSY,
+			     _test_ioctl_destroy(self->fd, iopf_hwpt_id));
+		/* Trigger an IOPF on the device */
+		test_cmd_trigger_iopf(self->device_id, fault_fd);
+
 		/* Detach from nested_hwpt_id[1] and destroy it */
 		test_cmd_mock_domain_replace(self->stdev_id, parent_hwpt_id);
 		test_ioctl_destroy(nested_hwpt_id[1]);
+		test_ioctl_destroy(iopf_hwpt_id);
 
 		/* Detach from the parent hw_pagetable and destroy it */
 		test_cmd_mock_domain_replace(self->stdev_id, self->ioas_id);
 		test_ioctl_destroy(parent_hwpt_id);
 		test_ioctl_destroy(parent_hwpt_id_not_work);
+		close(fault_fd);
+		test_ioctl_destroy(fault_id);
 	} else {
 		test_err_hwpt_alloc(ENOENT, self->device_id, self->ioas_id, 0,
 				    &parent_hwpt_id);

tools/testing/selftests/iommu/iommufd_fail_nth.c

@@ -615,7 +615,7 @@ TEST_FAIL_NTH(basic_fail_nth, device)
 	if (_test_cmd_get_hw_info(self->fd, idev_id, &info, sizeof(info), NULL))
 		return -1;
 
-	if (_test_cmd_hwpt_alloc(self->fd, idev_id, ioas_id, 0, &hwpt_id,
+	if (_test_cmd_hwpt_alloc(self->fd, idev_id, ioas_id, 0, 0, &hwpt_id,
 				 IOMMU_HWPT_DATA_NONE, 0, 0))
 		return -1;
 

tools/testing/selftests/iommu/iommufd_utils.h

@@ -153,7 +153,7 @@ static int _test_cmd_mock_domain_replace(int fd, __u32 stdev_id, __u32 pt_id,
 	EXPECT_ERRNO(_errno, _test_cmd_mock_domain_replace(self->fd, stdev_id, \
 							   pt_id, NULL))
 
-static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
+static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id, __u32 ft_id,
 				__u32 flags, __u32 *hwpt_id, __u32 data_type,
 				void *data, size_t data_len)
 {
@@ -165,6 +165,7 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
 		.data_type = data_type,
 		.data_len = data_len,
 		.data_uptr = (uint64_t)data,
+		.fault_id = ft_id,
 	};
 	int ret;
 
@@ -177,24 +178,36 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
 }
 
 #define test_cmd_hwpt_alloc(device_id, pt_id, flags, hwpt_id)                  \
-	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, flags,   \
+	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, 0, flags,   \
 					  hwpt_id, IOMMU_HWPT_DATA_NONE, NULL, \
 					  0))
 #define test_err_hwpt_alloc(_errno, device_id, pt_id, flags, hwpt_id)   \
 	EXPECT_ERRNO(_errno, _test_cmd_hwpt_alloc(                      \
-				     self->fd, device_id, pt_id, flags, \
+				     self->fd, device_id, pt_id, 0, flags, \
 				     hwpt_id, IOMMU_HWPT_DATA_NONE, NULL, 0))
 
 #define test_cmd_hwpt_alloc_nested(device_id, pt_id, flags, hwpt_id,         \
 				   data_type, data, data_len)                \
-	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, flags, \
+	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, 0, flags, \
 					  hwpt_id, data_type, data, data_len))
 #define test_err_hwpt_alloc_nested(_errno, device_id, pt_id, flags, hwpt_id, \
 				   data_type, data, data_len)                \
 	EXPECT_ERRNO(_errno,                                                 \
-		     _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, flags, \
+		     _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, 0, flags, \
 					  hwpt_id, data_type, data, data_len))
 
+#define test_cmd_hwpt_alloc_iopf(device_id, pt_id, fault_id, flags, hwpt_id,    \
+				   data_type, data, data_len)                   \
+	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, fault_id, \
+					  flags, hwpt_id, data_type, data,      \
+					  data_len))
+#define test_err_hwpt_alloc_iopf(_errno, device_id, pt_id, fault_id, flags,     \
+				 hwpt_id, data_type, data, data_len)            \
+	EXPECT_ERRNO(_errno,                                                    \
+		     _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, fault_id, \
+					  flags, hwpt_id, data_type, data,      \
+					  data_len))
+
 #define test_cmd_hwpt_check_iotlb(hwpt_id, iotlb_id, expected)                 \
 	({                                                                     \
 		struct iommu_test_cmd test_cmd = {                             \
@@ -684,3 +697,66 @@ static int _test_cmd_get_hw_info(int fd, __u32 device_id, void *data,
 
 #define test_cmd_get_hw_capabilities(device_id, caps, mask) \
 	ASSERT_EQ(0, _test_cmd_get_hw_info(self->fd, device_id, NULL, 0, &caps))
+
+static int _test_ioctl_fault_alloc(int fd, __u32 *fault_id, __u32 *fault_fd)
+{
+	struct iommu_fault_alloc cmd = {
+		.size = sizeof(cmd),
+	};
+	int ret;
+
+	ret = ioctl(fd, IOMMU_FAULT_QUEUE_ALLOC, &cmd);
+	if (ret)
+		return ret;
+	*fault_id = cmd.out_fault_id;
+	*fault_fd = cmd.out_fault_fd;
+	return 0;
+}
+
+#define test_ioctl_fault_alloc(fault_id, fault_fd)                       \
+	({                                                               \
+		ASSERT_EQ(0, _test_ioctl_fault_alloc(self->fd, fault_id, \
+						     fault_fd));         \
+		ASSERT_NE(0, *(fault_id));                               \
+		ASSERT_NE(0, *(fault_fd));                               \
+	})
+
+static int _test_cmd_trigger_iopf(int fd, __u32 device_id, __u32 fault_fd)
+{
+	struct iommu_test_cmd trigger_iopf_cmd = {
+		.size = sizeof(trigger_iopf_cmd),
+		.op = IOMMU_TEST_OP_TRIGGER_IOPF,
+		.trigger_iopf = {
+			.dev_id = device_id,
+			.pasid = 0x1,
+			.grpid = 0x2,
+			.perm = IOMMU_PGFAULT_PERM_READ | IOMMU_PGFAULT_PERM_WRITE,
+			.addr = 0xdeadbeaf,
+		},
+	};
+	struct iommu_hwpt_page_response response = {
+		.code = IOMMUFD_PAGE_RESP_SUCCESS,
+	};
+	struct iommu_hwpt_pgfault fault = {};
+	ssize_t bytes;
+	int ret;
+
+	ret = ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_IOPF), &trigger_iopf_cmd);
+	if (ret)
+		return ret;
+
+	bytes = read(fault_fd, &fault, sizeof(fault));
+	if (bytes <= 0)
+		return -EIO;
+
+	response.cookie = fault.cookie;
+
+	bytes = write(fault_fd, &response, sizeof(response));
+	if (bytes <= 0)
+		return -EIO;
+
+	return 0;
+}
+
+#define test_cmd_trigger_iopf(device_id, fault_fd) \
+	ASSERT_EQ(0, _test_cmd_trigger_iopf(self->fd, device_id, fault_fd))