1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2014, Michael Ellerman, IBM Corp.
4 */
5
6#define _GNU_SOURCE
7
8#include <elf.h>
9#include <limits.h>
10#include <stdio.h>
11#include <stdbool.h>
12#include <string.h>
13#include <sys/prctl.h>
14
15#include "event.h"
16#include "lib.h"
17#include "utils.h"
18
19/*
20 * Test that per-event excludes work.
21 */
22
23static int per_event_excludes(void)
24{
25	struct event *e, events[4];
26	int i;
27
28	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
29
30	/*
31	 * We need to create the events disabled, otherwise the running/enabled
32	 * counts don't match up.
33	 */
34	e = &events[0];
35	event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
36			PERF_TYPE_HARDWARE, "instructions");
37	e->attr.disabled = 1;
38
39	e = &events[1];
40	event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
41			PERF_TYPE_HARDWARE, "instructions(k)");
42	e->attr.disabled = 1;
43	e->attr.exclude_user = 1;
44	e->attr.exclude_hv = 1;
45
46	e = &events[2];
47	event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
48			PERF_TYPE_HARDWARE, "instructions(h)");
49	e->attr.disabled = 1;
50	e->attr.exclude_user = 1;
51	e->attr.exclude_kernel = 1;
52
53	e = &events[3];
54	event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
55			PERF_TYPE_HARDWARE, "instructions(u)");
56	e->attr.disabled = 1;
57	e->attr.exclude_hv = 1;
58	e->attr.exclude_kernel = 1;
59
60	FAIL_IF(event_open(&events[0]));
61
62	/*
63	 * The open here will fail if we don't have per event exclude support,
64	 * because the second event has an incompatible set of exclude settings
65	 * and we're asking for the events to be in a group.
66	 */
67	for (i = 1; i < 4; i++)
68		FAIL_IF(event_open_with_group(&events[i], events[0].fd));
69
70	/*
71	 * Even though the above will fail without per-event excludes we keep
72	 * testing in order to be thorough.
73	 */
74	prctl(PR_TASK_PERF_EVENTS_ENABLE);
75
76	/* Spin for a while */
77	for (i = 0; i < INT_MAX; i++)
78		asm volatile("" : : : "memory");
79
80	prctl(PR_TASK_PERF_EVENTS_DISABLE);
81
82	for (i = 0; i < 4; i++) {
83		FAIL_IF(event_read(&events[i]));
84		event_report(&events[i]);
85	}
86
87	/*
88	 * We should see that all events have enabled == running. That
89	 * shows that they were all on the PMU at once.
90	 */
91	for (i = 0; i < 4; i++)
92		FAIL_IF(events[i].result.running != events[i].result.enabled);
93
94	/*
95	 * We can also check that the result for instructions is >= all the
96	 * other counts. That's because it is counting all instructions while
97	 * the others are counting a subset.
98	 */
99	for (i = 1; i < 4; i++)
100		FAIL_IF(events[0].result.value < events[i].result.value);
101
102	for (i = 0; i < 4; i++)
103		event_close(&events[i]);
104
105	return 0;
106}
107
108int main(void)
109{
110	return test_harness(per_event_excludes, "per_event_excludes");
111}
112