per_event_excludes.c

  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}