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 <stdbool.h>
9
10#include "ebb.h"
11
12
13/*
14 * Test of counting cycles while manipulating the user accessible bits in MMCR2.
15 */
16
17/* We use two values because the first freezes PMC1 and so we would get no EBBs */
18#define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */
19#define MMCR2_EXPECTED_2 0x0020100804020000UL /* (     FC2P|FC3P|FC4P|FC5P|FC6P) */
20
21
22int cycles_with_mmcr2(void)
23{
24	struct event event;
25	uint64_t val, expected[2], actual;
26	int i;
27	bool bad_mmcr2;
28
29	SKIP_IF(!ebb_is_supported());
30
31	event_init_named(&event, 0x1001e, "cycles");
32	event_leader_ebb_init(&event);
33
34	event.attr.exclude_kernel = 1;
35	event.attr.exclude_hv = 1;
36	event.attr.exclude_idle = 1;
37
38	FAIL_IF(event_open(&event));
39
40	ebb_enable_pmc_counting(1);
41	setup_ebb_handler(standard_ebb_callee);
42	ebb_global_enable();
43
44	FAIL_IF(ebb_event_enable(&event));
45
46	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
47
48	/* XXX Set of MMCR2 must be after enable */
49	expected[0] = MMCR2_EXPECTED_1;
50	expected[1] = MMCR2_EXPECTED_2;
51	i = 0;
52	bad_mmcr2 = false;
53	actual = 0;
54
55	/* Make sure we loop until we take at least one EBB */
56	while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||
57		ebb_state.stats.ebb_count < 1)
58	{
59		mtspr(SPRN_MMCR2, expected[i % 2]);
60
61		FAIL_IF(core_busy_loop());
62
63		val = mfspr(SPRN_MMCR2);
64		if (val != expected[i % 2]) {
65			bad_mmcr2 = true;
66			actual = val;
67		}
68
69		i++;
70	}
71
72	ebb_global_disable();
73	ebb_freeze_pmcs();
74
75	dump_ebb_state();
76
77	event_close(&event);
78
79	FAIL_IF(ebb_state.stats.ebb_count == 0);
80
81	if (bad_mmcr2)
82		printf("Bad MMCR2 value seen is 0x%lx\n", actual);
83
84	FAIL_IF(bad_mmcr2);
85
86	return 0;
87}
88
89int main(void)
90{
91	return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");
92}
93