perf test: Convert watch point tests to test cases.

Use null terminated array of test cases rather than the previous sub
test functions.

Committer notes:

On s/390x we don't use __event(), so wrap it with __s390x__

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/20211104064208.3156807-12-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/wp.c

@@ -48,6 +48,7 @@ static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
 	attr->exclude_hv     = 1;
 }
 
+#ifndef __s390x__
 static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
 {
 	int fd;
@@ -61,9 +62,14 @@ static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
 
 	return fd;
 }
+#endif
 
-static int wp_ro_test(void)
+static int test__wp_ro(struct test_suite *test __maybe_unused,
+		       int subtest __maybe_unused)
 {
+#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)
+	return TEST_SKIP;
+#else
 	int fd;
 	unsigned long tmp, tmp1 = rand();
 
@@ -79,10 +85,15 @@ static int wp_ro_test(void)
 
 	close(fd);
 	return 0;
+#endif
 }
 
-static int wp_wo_test(void)
+static int test__wp_wo(struct test_suite *test __maybe_unused,
+		       int subtest __maybe_unused)
 {
+#if defined(__s390x__)
+	return TEST_SKIP;
+#else
 	int fd;
 	unsigned long tmp, tmp1 = rand();
 
@@ -98,10 +109,15 @@ static int wp_wo_test(void)
 
 	close(fd);
 	return 0;
+#endif
 }
 
-static int wp_rw_test(void)
+static int test__wp_rw(struct test_suite *test __maybe_unused,
+		       int subtest __maybe_unused)
 {
+#if defined(__s390x__)
+	return TEST_SKIP;
+#else
 	int fd;
 	unsigned long tmp, tmp1 = rand();
 
@@ -118,10 +134,15 @@ static int wp_rw_test(void)
 
 	close(fd);
 	return 0;
+#endif
 }
 
-static int wp_modify_test(void)
+static int test__wp_modify(struct test_suite *test __maybe_unused,
+			   int subtest __maybe_unused)
 {
+#if defined(__s390x__)
+	return TEST_SKIP;
+#else
 	int fd, ret;
 	unsigned long tmp = rand();
 	struct perf_event_attr new_attr;
@@ -163,105 +184,18 @@ static int wp_modify_test(void)
 
 	close(fd);
 	return 0;
-}
-
-static bool wp_ro_supported(void)
-{
-#if defined (__x86_64__) || defined (__i386__)
-	return false;
-#else
-	return true;
 #endif
 }
 
-static const char *wp_ro_skip_msg(void)
-{
-#if defined (__x86_64__) || defined (__i386__)
-	return "missing hardware support";
-#else
-	return NULL;
-#endif
-}
-
-static struct {
-	const char *desc;
-	int (*target_func)(void);
-	bool (*is_supported)(void);
-	const char *(*skip_msg)(void);
-} wp_testcase_table[] = {
-	{
-		.desc = "Read Only Watchpoint",
-		.target_func = &wp_ro_test,
-		.is_supported = &wp_ro_supported,
-		.skip_msg = &wp_ro_skip_msg,
-	},
-	{
-		.desc = "Write Only Watchpoint",
-		.target_func = &wp_wo_test,
-	},
-	{
-		.desc = "Read / Write Watchpoint",
-		.target_func = &wp_rw_test,
-	},
-	{
-		.desc = "Modify Watchpoint",
-		.target_func = &wp_modify_test,
-	},
+static struct test_case wp_tests[] = {
+	TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"),
+	TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"),
+	TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"),
+	TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"),
+	{ .name = NULL, }
 };
 
-static int test__wp_subtest_get_nr(void)
-{
-	return (int)ARRAY_SIZE(wp_testcase_table);
-}
-
-static const char *test__wp_subtest_get_desc(int i)
-{
-	if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
-		return NULL;
-	return wp_testcase_table[i].desc;
-}
-
-static const char *test__wp_subtest_skip_reason(int i)
-{
-	if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
-		return NULL;
-	if (!wp_testcase_table[i].skip_msg)
-		return NULL;
-	return wp_testcase_table[i].skip_msg();
-}
-
-static int test__wp(struct test_suite *test __maybe_unused, int i)
-{
-	if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
-		return TEST_FAIL;
-
-	if (wp_testcase_table[i].is_supported &&
-	    !wp_testcase_table[i].is_supported())
-		return TEST_SKIP;
-
-	return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
-}
-
-/* The s390 so far does not have support for
- * instruction breakpoint using the perf_event_open() system call.
- */
-static bool test__wp_is_supported(void)
-{
-#if defined(__s390x__)
-	return false;
-#else
-	return true;
-#endif
-}
-
 struct test_suite suite__wp = {
 	.desc = "Watchpoint",
-	.func = test__wp,
-	.is_supported = test__wp_is_supported,
-	.subtest = {
-		.skip_if_fail	= false,
-		.get_nr		= test__wp_subtest_get_nr,
-		.get_desc	= test__wp_subtest_get_desc,
-		.skip_reason    = test__wp_subtest_skip_reason,
-	},
+	.test_cases = wp_tests,
 };