perf test: Add test case struct.

Add a test case struct mirroring the 'struct kunit_case'. Use the struct
with the DEFINE_SUITE macro, where the single test is turned into a test
case. Update the helpers in builtin-test to handle test cases.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20211104064208.3156807-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/builtin-test.c

@@ -117,10 +117,19 @@ static struct test_suite **tests[] = {
 
 static int num_subtests(const struct test_suite *t)
 {
+	int num;
+
 	if (t->subtest.get_nr)
 		return t->subtest.get_nr();
 
-	return 0;
+	if (!t->test_cases)
+		return 0;
+
+	num = 0;
+	while (t->test_cases[num].name)
+		num++;
+
+	return num;
 }
 
 static bool has_subtests(const struct test_suite *t)
@@ -138,10 +147,13 @@ static const char *skip_reason(const struct test_suite *t, int subtest)
 
 static const char *test_description(const struct test_suite *t, int subtest)
 {
-	if (subtest < 0 || !t->subtest.get_desc)
-		return t->desc;
+	if (t->test_cases && subtest >= 0)
+		return t->test_cases[subtest].desc;
 
-	return t->subtest.get_desc(subtest);
+	if (t->subtest.get_desc && subtest >= 0)
+		return t->subtest.get_desc(subtest);
+
+	return t->desc;
 }
 
 static bool is_supported(const struct test_suite *t)
@@ -149,9 +161,15 @@ static bool is_supported(const struct test_suite *t)
 	return !t->is_supported || t->is_supported();
 }
 
-static test_fnptr test_function(const struct test_suite *t, int subtest __maybe_unused)
+static test_fnptr test_function(const struct test_suite *t, int subtest)
 {
-	return t->func;
+	if (t->func)
+		return t->func;
+
+	if (subtest <= 0)
+		return t->test_cases[0].run_case;
+
+	return t->test_cases[subtest].run_case;
 }
 
 static bool perf_test__matches(const char *desc, int curr, int argc, const char *argv[])

tools/perf/tests/tests.h

@@ -31,6 +31,12 @@ struct test_suite;
 
 typedef int (*test_fnptr)(struct test_suite *, int);
 
+struct test_case {
+	const char *name;
+	const char *desc;
+	test_fnptr run_case;
+};
+
 struct test_suite {
 	const char *desc;
 	test_fnptr func;
@@ -40,6 +46,7 @@ struct test_suite {
 		const char *(*get_desc)(int subtest);
 		const char *(*skip_reason)(int subtest);
 	} subtest;
+	struct test_case *test_cases;
 	bool (*is_supported)(void);
 	void *priv;
 };
@@ -47,10 +54,21 @@ struct test_suite {
 #define DECLARE_SUITE(name) \
 	extern struct test_suite suite__##name;
 
-#define DEFINE_SUITE(description, name)		\
-	struct test_suite suite__##name = {		\
-		.desc = description,		\
-		.func = test__##name,		\
+#define TEST_CASE(description, _name)			\
+	{						\
+		.name = #_name,				\
+		.desc = description,			\
+		.run_case = test__##_name,		\
+	}
+
+#define DEFINE_SUITE(description, _name)			\
+	struct test_case tests__##_name[] = {           \
+		TEST_CASE(description, _name),		\
+		{	.name = NULL, }			\
+	};						\
+	struct test_suite suite__##_name = {		\
+		.desc = description,			\
+		.test_cases = tests__##_name,		\
 	}
 
 /* Tests */