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