kunit: add KUNIT_INIT_TABLE to init linker section

Add KUNIT_INIT_TABLE to the INIT_DATA linker section.

Alter the KUnit macros to create init tests:
kunit_test_init_section_suites

Update lib/kunit/executor.c to run both the suites in KUNIT_TABLE and
KUNIT_INIT_TABLE.

Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Rae Moar <rmoar@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

2 files changed, 77 insertions, 13 deletions

diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 1236b3cd2fbb..847329c51e91 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -12,6 +12,8 @@
  */
 extern struct kunit_suite * const __kunit_suites_start[];
 extern struct kunit_suite * const __kunit_suites_end[];
+extern struct kunit_suite * const __kunit_init_suites_start[];
+extern struct kunit_suite * const __kunit_init_suites_end[];
 
 static char *action_param;
 
@@ -292,6 +294,33 @@ void kunit_exec_list_tests(struct kunit_suite_set *suite_set, bool include_attr)
 	}
 }
 
+struct kunit_suite_set kunit_merge_suite_sets(struct kunit_suite_set init_suite_set,
+		struct kunit_suite_set suite_set)
+{
+	struct kunit_suite_set total_suite_set = {NULL, NULL};
+	struct kunit_suite **total_suite_start = NULL;
+	size_t init_num_suites, num_suites, suite_size;
+
+	init_num_suites = init_suite_set.end - init_suite_set.start;
+	num_suites = suite_set.end - suite_set.start;
+	suite_size = sizeof(suite_set.start);
+
+	/* Allocate memory for array of all kunit suites */
+	total_suite_start = kmalloc_array(init_num_suites + num_suites, suite_size, GFP_KERNEL);
+	if (!total_suite_start)
+		return total_suite_set;
+
+	/* Append init suites and then all other kunit suites */
+	memcpy(total_suite_start, init_suite_set.start, init_num_suites * suite_size);
+	memcpy(total_suite_start + init_num_suites, suite_set.start, num_suites * suite_size);
+
+	/* Set kunit suite set start and end */
+	total_suite_set.start = total_suite_start;
+	total_suite_set.end = total_suite_start + (init_num_suites + num_suites);
+
+	return total_suite_set;
+}
+
 #if IS_BUILTIN(CONFIG_KUNIT)
 
 static char *kunit_shutdown;
@@ -313,21 +342,41 @@ static void kunit_handle_shutdown(void)
 
 int kunit_run_all_tests(void)
 {
-	struct kunit_suite_set suite_set = {
+	struct kunit_suite_set suite_set = {NULL, NULL};
+	struct kunit_suite_set filtered_suite_set = {NULL, NULL};
+	struct kunit_suite_set init_suite_set = {
+		__kunit_init_suites_start, __kunit_init_suites_end,
+	};
+	struct kunit_suite_set normal_suite_set = {
 		__kunit_suites_start, __kunit_suites_end,
 	};
+	size_t init_num_suites = init_suite_set.end - init_suite_set.start;
 	int err = 0;
+
+	if (init_num_suites > 0) {
+		suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
+		if (!suite_set.start)
+			goto out;
+	} else
+		suite_set = normal_suite_set;
+
 	if (!kunit_enabled()) {
 		pr_info("kunit: disabled\n");
-		goto out;
+		goto free_out;
 	}
 
 	if (filter_glob_param || filter_param) {
-		suite_set = kunit_filter_suites(&suite_set, filter_glob_param,
+		filtered_suite_set = kunit_filter_suites(&suite_set, filter_glob_param,
 				filter_param, filter_action_param, &err);
+
+		/* Free original suite set before using filtered suite set */
+		if (init_num_suites > 0)
+			kfree(suite_set.start);
+		suite_set = filtered_suite_set;
+
 		if (err) {
 			pr_err("kunit executor: error filtering suites: %d\n", err);
-			goto out;
+			goto free_out;
 		}
 	}
 
@@ -340,9 +389,12 @@ int kunit_run_all_tests(void)
 	else
 		pr_err("kunit executor: unknown action '%s'\n", action_param);
 
-	if (filter_glob_param || filter_param) { /* a copy was made of each suite */
+free_out:
+	if (filter_glob_param || filter_param)
 		kunit_free_suite_set(suite_set);
-	}
+	else if (init_num_suites > 0)
+		/* Don't use kunit_free_suite_set because suites aren't individually allocated */
+		kfree(suite_set.start);
 
 out:
 	kunit_handle_shutdown();
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 7deee3701d20..6b60d85ce108 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -742,28 +742,40 @@ EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
 #ifdef CONFIG_MODULES
 static void kunit_module_init(struct module *mod)
 {
-	struct kunit_suite_set suite_set = {
+	struct kunit_suite_set suite_set, filtered_set;
+	struct kunit_suite_set normal_suite_set = {
 		mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
 	};
+	struct kunit_suite_set init_suite_set = {
+		mod->kunit_init_suites, mod->kunit_init_suites + mod->num_kunit_init_suites,
+	};
 	const char *action = kunit_action();
 	int err = 0;
 
-	suite_set = kunit_filter_suites(&suite_set,
+	if (mod->num_kunit_init_suites > 0)
+		suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
+	else
+		suite_set = normal_suite_set;
+
+	filtered_set = kunit_filter_suites(&suite_set,
 					kunit_filter_glob() ?: "*.*",
 					kunit_filter(), kunit_filter_action(),
 					&err);
 	if (err)
 		pr_err("kunit module: error filtering suites: %d\n", err);
 
-	mod->kunit_suites = (struct kunit_suite **)suite_set.start;
-	mod->num_kunit_suites = suite_set.end - suite_set.start;
+	mod->kunit_suites = (struct kunit_suite **)filtered_set.start;
+	mod->num_kunit_suites = filtered_set.end - filtered_set.start;
+
+	if (mod->num_kunit_init_suites > 0)
+		kfree(suite_set.start);
 
 	if (!action)
-		kunit_exec_run_tests(&suite_set, false);
+		kunit_exec_run_tests(&filtered_set, false);
 	else if (!strcmp(action, "list"))
-		kunit_exec_list_tests(&suite_set, false);
+		kunit_exec_list_tests(&filtered_set, false);
 	else if (!strcmp(action, "list_attr"))
-		kunit_exec_list_tests(&suite_set, true);
+		kunit_exec_list_tests(&filtered_set, true);
 	else
 		pr_err("kunit: unknown action '%s'\n", action);
 }