iommufd/selftest: Add domain_alloc_user() support in iommu mock

Add mock_domain_alloc_user() and a new test case for
IOMMU_HWPT_ALLOC_NEST_PARENT.

Link: https://lore.kernel.org/r/20230928071528.26258-6-yi.l.liu@intel.com
Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: yiliu1765

drivers/iommu/iommufd/selftest.c

@@ -146,6 +146,8 @@ static void *mock_domain_hw_info(struct device *dev, u32 *length, u32 *type)
 	return info;
 }
 
+static const struct iommu_ops mock_ops;
+
 static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
 {
 	struct mock_iommu_domain *mock;
@@ -162,10 +164,26 @@ static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
 	mock->domain.geometry.aperture_start = MOCK_APERTURE_START;
 	mock->domain.geometry.aperture_end = MOCK_APERTURE_LAST;
 	mock->domain.pgsize_bitmap = MOCK_IO_PAGE_SIZE;
+	mock->domain.ops = mock_ops.default_domain_ops;
+	mock->domain.type = iommu_domain_type;
 	xa_init(&mock->pfns);
 	return &mock->domain;
 }
 
+static struct iommu_domain *
+mock_domain_alloc_user(struct device *dev, u32 flags)
+{
+	struct iommu_domain *domain;
+
+	if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT))
+		return ERR_PTR(-EOPNOTSUPP);
+
+	domain = mock_domain_alloc(IOMMU_DOMAIN_UNMANAGED);
+	if (!domain)
+		domain = ERR_PTR(-ENOMEM);
+	return domain;
+}
+
 static void mock_domain_free(struct iommu_domain *domain)
 {
 	struct mock_iommu_domain *mock =
@@ -307,6 +325,7 @@ static const struct iommu_ops mock_ops = {
 	.pgsize_bitmap = MOCK_IO_PAGE_SIZE,
 	.hw_info = mock_domain_hw_info,
 	.domain_alloc = mock_domain_alloc,
+	.domain_alloc_user = mock_domain_alloc_user,
 	.capable = mock_domain_capable,
 	.set_platform_dma_ops = mock_domain_set_plaform_dma_ops,
 	.device_group = generic_device_group,

tools/testing/selftests/iommu/iommufd.c

@@ -114,6 +114,7 @@ TEST_F(iommufd, cmd_length)
 
 	TEST_LENGTH(iommu_destroy, IOMMU_DESTROY);
 	TEST_LENGTH(iommu_hw_info, IOMMU_GET_HW_INFO);
+	TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC);
 	TEST_LENGTH(iommu_ioas_alloc, IOMMU_IOAS_ALLOC);
 	TEST_LENGTH(iommu_ioas_iova_ranges, IOMMU_IOAS_IOVA_RANGES);
 	TEST_LENGTH(iommu_ioas_allow_iovas, IOMMU_IOAS_ALLOW_IOVAS);
@@ -1404,13 +1405,28 @@ TEST_F(iommufd_mock_domain, alloc_hwpt)
 	int i;
 
 	for (i = 0; i != variant->mock_domains; i++) {
+		uint32_t hwpt_id[2];
 		uint32_t stddev_id;
-		uint32_t hwpt_id;
 
-		test_cmd_hwpt_alloc(self->idev_ids[i], self->ioas_id, &hwpt_id);
-		test_cmd_mock_domain(hwpt_id, &stddev_id, NULL, NULL);
+		test_err_hwpt_alloc(EOPNOTSUPP,
+				    self->idev_ids[i], self->ioas_id,
+				    ~IOMMU_HWPT_ALLOC_NEST_PARENT, &hwpt_id[0]);
+		test_cmd_hwpt_alloc(self->idev_ids[i], self->ioas_id,
+				    0, &hwpt_id[0]);
+		test_cmd_hwpt_alloc(self->idev_ids[i], self->ioas_id,
+				    IOMMU_HWPT_ALLOC_NEST_PARENT, &hwpt_id[1]);
+
+		/* Do a hw_pagetable rotation test */
+		test_cmd_mock_domain_replace(self->stdev_ids[i], hwpt_id[0]);
+		EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, hwpt_id[0]));
+		test_cmd_mock_domain_replace(self->stdev_ids[i], hwpt_id[1]);
+		EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, hwpt_id[1]));
+		test_cmd_mock_domain_replace(self->stdev_ids[i], self->ioas_id);
+		test_ioctl_destroy(hwpt_id[1]);
+
+		test_cmd_mock_domain(hwpt_id[0], &stddev_id, NULL, NULL);
 		test_ioctl_destroy(stddev_id);
-		test_ioctl_destroy(hwpt_id);
+		test_ioctl_destroy(hwpt_id[0]);
 	}
 }
 

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)))
 		return -1;
 
-	if (_test_cmd_hwpt_alloc(self->fd, idev_id, ioas_id, &hwpt_id))
+	if (_test_cmd_hwpt_alloc(self->fd, idev_id, ioas_id, 0, &hwpt_id))
 		return -1;
 
 	if (_test_cmd_mock_domain_replace(self->fd, stdev_id, ioas_id2, NULL))

tools/testing/selftests/iommu/iommufd_utils.h

@@ -103,10 +103,11 @@ static int _test_cmd_mock_domain_replace(int fd, __u32 stdev_id, __u32 pt_id,
 							   pt_id, NULL))
 
 static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
-					 __u32 *hwpt_id)
+				__u32 flags, __u32 *hwpt_id)
 {
 	struct iommu_hwpt_alloc cmd = {
 		.size = sizeof(cmd),
+		.flags = flags,
 		.dev_id = device_id,
 		.pt_id = pt_id,
 	};
@@ -120,8 +121,12 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
 	return 0;
 }
 
-#define test_cmd_hwpt_alloc(device_id, pt_id, hwpt_id) \
-	ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, hwpt_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, hwpt_id))
+#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, hwpt_id))
 
 static int _test_cmd_access_replace_ioas(int fd, __u32 access_id,
 					 unsigned int ioas_id)