1/*
2 * Copyright 2014, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
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	event_init_named(&event, 0x1001e, "cycles");
30	event_leader_ebb_init(&event);
31
32	event.attr.exclude_kernel = 1;
33	event.attr.exclude_hv = 1;
34	event.attr.exclude_idle = 1;
35
36	FAIL_IF(event_open(&event));
37
38	ebb_enable_pmc_counting(1);
39	setup_ebb_handler(standard_ebb_callee);
40	ebb_global_enable();
41
42	FAIL_IF(ebb_event_enable(&event));
43
44	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
45
46	/* XXX Set of MMCR2 must be after enable */
47	expected[0] = MMCR2_EXPECTED_1;
48	expected[1] = MMCR2_EXPECTED_2;
49	i = 0;
50	bad_mmcr2 = false;
51
52	/* Make sure we loop until we take at least one EBB */
53	while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||
54		ebb_state.stats.ebb_count < 1)
55	{
56		mtspr(SPRN_MMCR2, expected[i % 2]);
57
58		FAIL_IF(core_busy_loop());
59
60		val = mfspr(SPRN_MMCR2);
61		if (val != expected[i % 2]) {
62			bad_mmcr2 = true;
63			actual = val;
64		}
65
66		i++;
67	}
68
69	ebb_global_disable();
70	ebb_freeze_pmcs();
71
72	count_pmc(1, sample_period);
73
74	dump_ebb_state();
75
76	event_close(&event);
77
78	FAIL_IF(ebb_state.stats.ebb_count == 0);
79
80	if (bad_mmcr2)
81		printf("Bad MMCR2 value seen is 0x%lx\n", actual);
82
83	FAIL_IF(bad_mmcr2);
84
85	return 0;
86}
87
88int main(void)
89{
90	return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");
91}
92