1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2014, Michael Ellerman, IBM Corp.
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <setjmp.h>
9#include <signal.h>
10
11#include "ebb.h"
12
13
14/* Test that things work sanely if we have no handler */
15
16static int no_handler_test(void)
17{
18	struct event event;
19	u64 val;
20	int i;
21
22	SKIP_IF(!ebb_is_supported());
23
24	event_init_named(&event, 0x1001e, "cycles");
25	event_leader_ebb_init(&event);
26
27	event.attr.exclude_kernel = 1;
28	event.attr.exclude_hv = 1;
29	event.attr.exclude_idle = 1;
30
31	FAIL_IF(event_open(&event));
32	FAIL_IF(ebb_event_enable(&event));
33
34	val = mfspr(SPRN_EBBHR);
35	FAIL_IF(val != 0);
36
37	/* Make sure it overflows quickly */
38	sample_period = 1000;
39	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
40
41	/* Spin to make sure the event has time to overflow */
42	for (i = 0; i < 1000; i++)
43		mb();
44
45	dump_ebb_state();
46
47	/* We expect to see the PMU frozen & PMAO set */
48	val = mfspr(SPRN_MMCR0);
49	FAIL_IF(val != 0x0000000080000080);
50
51	event_close(&event);
52
53	/* The real test is that we never took an EBB at 0x0 */
54
55	return 0;
56}
57
58int main(void)
59{
60	return test_harness(no_handler_test,"no_handler_test");
61}
62