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