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