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
  16 static 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
  32 static 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
  60 static 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
 114 int 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
 136 free_path:
 137         unlink(path);
 138         return ret;
 139 }