[PATCH V2 17/35] selftest/powerpc/pmu: Add selftest to check PMC5/6 is excluded from some constraint checks

[Athira Rajeev <atrajeev@linux.vnet.ibm.com>]

Events using Performance Monitor Counter 5 (PMC5) and
Performance Monitor Counter 6 (PMC6) should be excluded
from constraint check when scheduled along with group of
events. Example, combination of PMC5, PMC6, and an event
with cache bit will succeed to schedule though first two
events doesn't have cache bit set. Testcase use three events,
ie, 600f4(cycles), 500fa(instructions), 22C040 with cache
bit (dc_ic) set to test this constraint check.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
 .../powerpc/pmu/event_code_tests/Makefile     |  2 +-
 .../group_pmc56_exclude_constraints_test.c    | 64 +++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/pmu/event_code_tests/group_pmc56_exclude_constraints_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 eb0017233b0b..c0eb28935e6e 100644
--- a/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 CFLAGS += -m64
 
-TEST_GEN_PROGS := group_constraint_pmc56_test
+TEST_GEN_PROGS := group_constraint_pmc56_test group_pmc56_exclude_constraints_test
 
 top_srcdir = ../../../../../..
 include ../../../lib.mk
diff --git a/tools/testing/selftests/powerpc/pmu/event_code_tests/group_pmc56_exclude_constraints_test.c b/tools/testing/selftests/powerpc/pmu/event_code_tests/group_pmc56_exclude_constraints_test.c
new file mode 100644
index 000000000000..cff9ac170df6
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/group_pmc56_exclude_constraints_test.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include "../event.h"
+#include <sys/prctl.h>
+#include <limits.h>
+#include "../sampling_tests/misc.h"
+
+/*
+ * Testcase for group constraint check for
+ * Performance Monitor Counter 5 (PMC5) and also
+ * Performance Monitor Counter 6 (PMC6).
+ * Test that pmc5/6 is excluded from constraint
+ * check when scheduled along with group of events.
+ */
+
+static int group_pmc56_exclude_constraints(void)
+{
+	struct event *e, events[3];
+	int i;
+
+	/* Check for platform support for the test */
+	SKIP_IF(platform_check_for_tests());
+
+	/*
+	 * PMC5/6 is excluded from constraint bit
+	 * check along with group of events. Use
+	 * group of events with PMC5, PMC6 and also
+	 * event with cache bit (dc_ic) set. Test expects
+	 * this set of events to go in as a group.
+	 */
+	e = &events[0];
+	event_init(e, 0x500fa);
+
+	e = &events[1];
+	event_init(e, 0x600f4);
+
+	e = &events[2];
+	event_init(e, 0x22C040);
+
+	FAIL_IF(event_open(&events[0]));
+
+	/*
+	 * The event_open will fail if constraint check fails.
+	 * Since we are asking for events in a group and since
+	 * PMC5/PMC6 is excluded from group constraints, even_open
+	 * should pass.
+	 */
+	for (i = 1; i < 3; i++)
+		FAIL_IF(event_open_with_group(&events[i], events[0].fd));
+
+	for (i = 0; i < 3; i++)
+		event_close(&events[i]);
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(group_pmc56_exclude_constraints, "group_pmc56_exclude_constraints");
+}
-- 
2.35.1