1// SPDX-License-Identifier: GPL-2.0
  2#include <string.h>
  3#include <stdlib.h>
  4#include <stdio.h>
  5#include <perf/cpumap.h>
  6#include "cpumap.h"
  7#include "tests.h"
  8#include "session.h"
  9#include "evlist.h"
 10#include "debug.h"
 11#include <linux/err.h>
 12
 13#define TEMPL "/tmp/perf-test-XXXXXX"
 14#define DATA_SIZE	10
 15
 16static int get_temp(char *path)
 17{
 18	int fd;
 19
 20	strcpy(path, TEMPL);
 21
 22	fd = mkstemp(path);
 23	if (fd < 0) {
 24		perror("mkstemp failed");
 25		return -1;
 26	}
 27
 28	close(fd);
 29	return 0;
 30}
 31
 32static int session_write_header(char *path)
 33{
 34	struct perf_session *session;
 35	struct perf_data data = {
 36		.file      = {
 37			.path = path,
 38		},
 39		.mode      = PERF_DATA_MODE_WRITE,
 40	};
 41
 42	session = perf_session__new(&data, false, NULL);
 43	TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
 44
 45	session->evlist = perf_evlist__new_default();
 46	TEST_ASSERT_VAL("can't get evlist", session->evlist);
 47
 48	perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
 49	perf_header__set_feat(&session->header, HEADER_NRCPUS);
 50	perf_header__set_feat(&session->header, HEADER_ARCH);
 51
 52	session->header.data_size += DATA_SIZE;
 53
 54	TEST_ASSERT_VAL("failed to write header",
 55			!perf_session__write_header(session, session->evlist, data.file.fd, true));
 56
 57	perf_session__delete(session);
 58
 59	return 0;
 60}
 61
 62static int check_cpu_topology(char *path, struct perf_cpu_map *map)
 63{
 64	struct perf_session *session;
 65	struct perf_data data = {
 66		.file      = {
 67			.path = path,
 68		},
 69		.mode      = PERF_DATA_MODE_READ,
 70	};
 71	int i;
 72
 73	session = perf_session__new(&data, false, NULL);
 74	TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
 75
 76	/* On platforms with large numbers of CPUs process_cpu_topology()
 77	 * might issue an error while reading the perf.data file section
 78	 * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
 79	 * cpu is a NULL pointer.
 80	 * Example: On s390
 81	 *   CPU 0 is on core_id 0 and physical_package_id 6
 82	 *   CPU 1 is on core_id 1 and physical_package_id 3
 83	 *
 84	 *   Core_id and physical_package_id are platform and architecture
 85	 *   dependend and might have higher numbers than the CPU id.
 86	 *   This actually depends on the configuration.
 87	 *
 88	 *  In this case process_cpu_topology() prints error message:
 89	 *  "socket_id number is too big. You may need to upgrade the
 90	 *  perf tool."
 91	 *
 92	 *  This is the reason why this test might be skipped.
 93	 */
 94	if (!session->header.env.cpu)
 95		return TEST_SKIP;
 96
 97	for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
 98		if (!cpu_map__has(map, i))
 99			continue;
100		pr_debug("CPU %d, core %d, socket %d\n", i,
101			 session->header.env.cpu[i].core_id,
102			 session->header.env.cpu[i].socket_id);
103	}
104
105	for (i = 0; i < map->nr; i++) {
106		TEST_ASSERT_VAL("Core ID doesn't match",
107			(session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
108
109		TEST_ASSERT_VAL("Socket ID doesn't match",
110			(session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
111	}
112
113	perf_session__delete(session);
114
115	return 0;
116}
117
118int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
119{
120	char path[PATH_MAX];
121	struct perf_cpu_map *map;
122	int ret = TEST_FAIL;
123
124	TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
125
126	pr_debug("templ file: %s\n", path);
127
128	if (session_write_header(path))
129		goto free_path;
130
131	map = perf_cpu_map__new(NULL);
132	if (map == NULL) {
133		pr_debug("failed to get system cpumap\n");
134		goto free_path;
135	}
136
137	ret = check_cpu_topology(path, map);
138	perf_cpu_map__put(map);
139
140free_path:
141	unlink(path);
142	return ret;
143}