1 files changed, 57 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c
new file mode 100644
index 000000000000..839d2d225da0
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../event.h"
+#include "misc.h"
+#include "utils.h"
+
+/*
+ * A perf sampling test for making sure
+ * sampling with -intr-regs doesn't crash
+ * in any environment, say:
+ *  - With generic compat PMU
+ *  - without any PMU registered
+ *  - With platform specific PMU.
+ *  A fix for crash with intr_regs was
+ *  addressed in commit: f75e7d73bdf7 in kernel.
+ *
+ * This testcase exercises this code path by doing
+ * intr_regs using software event. Software event is
+ * used since s/w event will work even in platform
+ * without PMU.
+ */
+static int intr_regs_no_crash_wo_pmu_test(void)
+{
+	struct event event;
+
+	/*
+	 * Init the event for the sampling test.
+	 * This uses software event which works on
+	 * any platform.
+	 */
+	event_init_opts(&event, 0, PERF_TYPE_SOFTWARE, "cycles");
+
+	event.attr.sample_period = 1000;
+	event.attr.sample_type = PERF_SAMPLE_REGS_INTR;
+	event.attr.disabled = 1;
+
+	/*
+	 * Return code of event_open is not considered
+	 * since test just expects no crash from using
+	 * PERF_SAMPLE_REGS_INTR.
+	 */
+	event_open(&event);
+
+	event_close(&event);
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(intr_regs_no_crash_wo_pmu_test, "intr_regs_no_crash_wo_pmu_test");
+}