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