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                .path = path,
  37                .mode = PERF_DATA_MODE_WRITE,
  38        };
  39
  40        session = perf_session__new(&data, false, NULL);
  41        TEST_ASSERT_VAL("can't get session", !IS_ERR(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 perf_cpu_map *map)
  61{
  62        struct perf_session *session;
  63        struct perf_data data = {
  64                .path = path,
  65                .mode = PERF_DATA_MODE_READ,
  66        };
  67        int i;
  68
  69        session = perf_session__new(&data, false, NULL);
  70        TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
  71
  72        /* On platforms with large numbers of CPUs process_cpu_topology()
  73         * might issue an error while reading the perf.data file section
  74         * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
  75         * cpu is a NULL pointer.
  76         * Example: On s390
  77         *   CPU 0 is on core_id 0 and physical_package_id 6
  78         *   CPU 1 is on core_id 1 and physical_package_id 3
  79         *
  80         *   Core_id and physical_package_id are platform and architecture
  81         *   dependend and might have higher numbers than the CPU id.
  82         *   This actually depends on the configuration.
  83         *
  84         *  In this case process_cpu_topology() prints error message:
  85         *  "socket_id number is too big. You may need to upgrade the
  86         *  perf tool."
  87         *
  88         *  This is the reason why this test might be skipped.
  89         */
  90        if (!session->header.env.cpu)
  91                return TEST_SKIP;
  92
  93        for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
  94                if (!cpu_map__has(map, i))
  95                        continue;
  96                pr_debug("CPU %d, core %d, socket %d\n", i,
  97                         session->header.env.cpu[i].core_id,
  98                         session->header.env.cpu[i].socket_id);
  99        }
 100
 101        for (i = 0; i < map->nr; i++) {
 102                TEST_ASSERT_VAL("Core ID doesn't match",
 103                        (session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
 104
 105                TEST_ASSERT_VAL("Socket ID doesn't match",
 106                        (session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
 107        }
 108
 109        perf_session__delete(session);
 110
 111        return 0;
 112}
 113
 114int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
 115{
 116        char path[PATH_MAX];
 117        struct perf_cpu_map *map;
 118        int ret = TEST_FAIL;
 119
 120        TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
 121
 122        pr_debug("templ file: %s\n", path);
 123
 124        if (session_write_header(path))
 125                goto free_path;
 126
 127        map = perf_cpu_map__new(NULL);
 128        if (map == NULL) {
 129                pr_debug("failed to get system cpumap\n");
 130                goto free_path;
 131        }
 132
 133        ret = check_cpu_topology(path, map);
 134        perf_cpu_map__put(map);
 135
 136free_path:
 137        unlink(path);
 138        return ret;
 139}
 140