LXR linux/tools/perf/tests/topology.c

   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}
 144