linux_kernel/tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c

/*
 * Copyright 2014, Michael Ellerman, IBM Corp.
 * Licensed under GPLv2.
 */

#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
#include <signal.h>

#include "ebb.h"


/* Test that things work sanely if we have no handler */

static int no_handler_test(void)
{
	struct event event;
	u64 val;
	int i;

	SKIP_IF(!ebb_is_supported());

	event_init_named(&event, 0x1001e, "cycles");
	event_leader_ebb_init(&event);

	event.attr.exclude_kernel = 1;
	event.attr.exclude_hv = 1;
	event.attr.exclude_idle = 1;

	FAIL_IF(event_open(&event));
	FAIL_IF(ebb_event_enable(&event));

	val = mfspr(SPRN_EBBHR);
	FAIL_IF(val != 0);

	/* Make sure it overflows quickly */
	sample_period = 1000;
	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));

	/* Spin to make sure the event has time to overflow */
	for (i = 0; i < 1000; i++)
		mb();

	dump_ebb_state();

	/* We expect to see the PMU frozen & PMAO set */
	val = mfspr(SPRN_MMCR0);
	FAIL_IF(val != 0x0000000080000080);

	event_close(&event);

	dump_ebb_state();

	/* The real test is that we never took an EBB at 0x0 */

	return 0;
}

int main(void)
{
	return test_harness(no_handler_test,"no_handler_test");
}