[PATCH 19/35] selftest/powerpc/pmu: Add selftest for group constraint check when using same PMC

[Kajol Jain <kjain@linux.ibm.com>]

From: Athira Rajeev <atrajeev@linux.vnet.ibm.com>

Testcase for group constraint check when using events
with same PMC. Multiple events in a group asking for
same PMC should fail. Testcase uses "0x22C040" on PMC2
as leader and also subling which is expected to fail.
Using PMC1 for sibling event should pass the test.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
 .../powerpc/pmu/event_code_tests/Makefile     |  3 +-
 .../group_constraint_repeat_test.c            | 56 +++++++++++++++++++
 2 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/pmu/event_code_tests/group_constraint_repeat_test.c

diff --git a/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile b/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
index 6310634c5beb..ace100e3226e 100644
--- a/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 CFLAGS += -m64
 
-TEST_GEN_PROGS := group_constraint_pmc56_test group_pmc56_exclude_constraints_test group_constraint_pmc_count_test
+TEST_GEN_PROGS := group_constraint_pmc56_test group_pmc56_exclude_constraints_test group_constraint_pmc_count_test \
+	group_constraint_repeat_test
 
 top_srcdir = ../../../../../..
 include ../../../lib.mk
diff --git a/tools/testing/selftests/powerpc/pmu/event_code_tests/group_constraint_repeat_test.c b/tools/testing/selftests/powerpc/pmu/event_code_tests/group_constraint_repeat_test.c
new file mode 100644
index 000000000000..371cd05bb3ed
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/group_constraint_repeat_test.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include "../event.h"
+#include "../sampling_tests/misc.h"
+
+/* The processor's L1 data cache was reloaded */
+#define EventCode1 0x21C040
+#define EventCode2 0x22C040
+
+/*
+ * Testcase for group constraint check
+ * when using events with same PMC.
+ * Multiple events in a group shouldn't
+ * ask for same PMC. If so it should fail.
+ */
+
+static int group_constraint_repeat(void)
+{
+	struct event event, leader;
+
+	/* Check for platform support for the test */
+	SKIP_IF(platform_check_for_tests());
+
+	/*
+	 * Two events in a group using same PMC
+	 * should fail to get scheduled. Usei same PMC2
+	 * for leader and sibling event which is expected
+	 * to fail.
+	 */
+	event_init(&leader, EventCode1);
+	FAIL_IF(event_open(&leader));
+
+	event_init(&event, EventCode1);
+
+	/* Expected to fail since sibling event is requesting same PMC as leader */
+	FAIL_IF(!event_open_with_group(&event, leader.fd));
+
+	event_init(&event, EventCode2);
+
+	/* Expected to pass since sibling event is requesting different PMC */
+	FAIL_IF(event_open_with_group(&event, leader.fd));
+
+	event_close(&leader);
+	event_close(&event);
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(group_constraint_repeat, "group_constraint_repeat");
+}
-- 
2.31.1