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// 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");
}
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