event_groups.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <string.h>
  3#include <unistd.h>
  4#include <stdio.h>
  5#include "linux/perf_event.h"
  6#include "tests.h"
  7#include "debug.h"
  8#include "pmu.h"
  9#include "pmus.h"
 10#include "header.h"
 11#include "../perf-sys.h"
 12
 13/* hw: cycles,instructions sw: context-switch, uncore: [arch dependent] */
 14static int types[] = {0, 1, -1};
 15static unsigned long configs[] = {0, 3, 0};
 16static unsigned long configs_hw[] = {1};
 17
 18#define NR_UNCORE_PMUS 5
 19
 20/* Uncore pmus that support more than 3 counters */
 21static struct uncore_pmus {
 22	const char *name;
 23	__u64 config;
 24} uncore_pmus[NR_UNCORE_PMUS] = {
 25	{ "amd_l3", 0x0 },
 26	{ "amd_df", 0x0 },
 27	{ "uncore_imc_0", 0x1 },         /* Intel */
 28	{ "core_imc", 0x318 },           /* PowerPC: core_imc/CPM_STCX_FIN/ */
 29	{ "hv_24x7", 0x22000000003 },    /* PowerPC: hv_24x7/CPM_STCX_FIN/ */
 30};
 31
 32static int event_open(int type, unsigned long config, int group_fd)
 33{
 34	struct perf_event_attr attr;
 35
 36	memset(&attr, 0, sizeof(struct perf_event_attr));
 37	attr.type = type;
 38	attr.size = sizeof(struct perf_event_attr);
 39	attr.config = config;
 40	/*
 41	 * When creating an event group, typically the group leader is
 42	 * initialized with disabled set to 1 and any child events are
 43	 * initialized with disabled set to 0. Despite disabled being 0,
 44	 * the child events will not start until the group leader is
 45	 * enabled.
 46	 */
 47	attr.disabled = group_fd == -1 ? 1 : 0;
 48
 49	return sys_perf_event_open(&attr, -1, 0, group_fd, 0);
 50}
 51
 52static int setup_uncore_event(void)
 53{
 54	struct perf_pmu *pmu = NULL;
 55	int i, fd;
 56
 57	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
 58		for (i = 0; i < NR_UNCORE_PMUS; i++) {
 59			if (!strcmp(uncore_pmus[i].name, pmu->name)) {
 60				pr_debug("Using %s for uncore pmu event\n", pmu->name);
 61				types[2] = pmu->type;
 62				configs[2] = uncore_pmus[i].config;
 63				/*
 64				 * Check if the chosen uncore pmu event can be
 65				 * used in the test. For example, incase of accessing
 66				 * hv_24x7 pmu counters, partition should have
 67				 * additional permissions. If not, event open will
 68				 * fail. So check if the event open succeeds
 69				 * before proceeding.
 70				 */
 71				fd = event_open(types[2], configs[2], -1);
 72				if (fd < 0)
 73					return -1;
 74				close(fd);
 75				return 0;
 76			}
 77		}
 78	}
 79	return -1;
 80}
 81
 82static int run_test(int i, int j, int k)
 83{
 84	int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);
 85	int group_fd, sibling_fd1, sibling_fd2;
 86
 87	group_fd = event_open(types[i], configs[i], -1);
 88	if (group_fd == -1)
 89		return -1;
 90
 91	sibling_fd1 = event_open(types[j], configs[j], group_fd);
 92	if (sibling_fd1 == -1) {
 93		close(group_fd);
 94		return erroneous ? 0 : -1;
 95	}
 96
 97	/*
 98	 * if all three events (leader and two sibling events)
 99	 * are hardware events, use instructions as one of the
100	 * sibling event. There is event constraint in powerpc that
101	 * events using same counter cannot be programmed in a group.
102	 * Since PERF_COUNT_HW_INSTRUCTIONS is a generic hardware
103	 * event and present in all platforms, lets use that.
104	 */
105	if (!i && !j && !k)
106		sibling_fd2 = event_open(types[k], configs_hw[k], group_fd);
107	else
108		sibling_fd2 = event_open(types[k], configs[k], group_fd);
109	if (sibling_fd2 == -1) {
110		close(sibling_fd1);
111		close(group_fd);
112		return erroneous ? 0 : -1;
113	}
114
115	close(sibling_fd2);
116	close(sibling_fd1);
117	close(group_fd);
118	return erroneous ? -1 : 0;
119}
120
121static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)
122{
123	int i, j, k;
124	int ret;
125	int r;
126
127	ret = setup_uncore_event();
128	if (ret || types[2] == -1)
129		return TEST_SKIP;
130
131	ret = TEST_OK;
132	for (i = 0; i < 3; i++) {
133		for (j = 0; j < 3; j++) {
134			for (k = 0; k < 3; k++) {
135				r = run_test(i, j, k);
136				if (r)
137					ret = TEST_FAIL;
138
139				/*
140				 * For all three events as HW events, second sibling
141				 * event is picked from configs_hw. So print accordingly
142				 */
143				if (!i && !j && !k)
144					pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
145						 types[i], configs[i], types[j], configs[j],
146						 types[k], configs_hw[k], r ? "Fail" : "Pass");
147				else
148					pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
149						 types[i], configs[i], types[j], configs[j],
150						 types[k], configs[k], r ? "Fail" : "Pass");
151			}
152		}
153	}
154	return ret;
155}
156
157DEFINE_SUITE("Event groups", event_groups);