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 = 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, id;
  68
  69         session = perf_session__new(&data, false, NULL);
  70         TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
  71         cpu__setup_cpunode_map();
  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. aarch64 and
  90          *  s390 always write this part of the header, even when the above
  91          *  condition is true (see do_core_id_test in header.c). So always
  92          *  run this test on those platforms.
  93          */
  94         if (!session->header.env.cpu
  95                         && strncmp(session->header.env.arch, "s390", 4)
  96                         && strncmp(session->header.env.arch, "aarch64", 7))
  97                 return TEST_SKIP;
  98
  99         TEST_ASSERT_VAL("Session header CPU map not set", session->header.env.cpu);
 100
 101         for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
 102                 if (!cpu_map__has(map, i))
 103                         continue;
 104                 pr_debug("CPU %d, core %d, socket %d\n", i,
 105                          session->header.env.cpu[i].core_id,
 106                          session->header.env.cpu[i].socket_id);
 107         }
 108
 109         // Test that core ID contains socket, die and core
 110         for (i = 0; i < map->nr; i++) {
 111                 id = cpu_map__get_core(map, i, NULL);
 112                 TEST_ASSERT_VAL("Core map - Core ID doesn't match",
 113                         session->header.env.cpu[map->map[i]].core_id == cpu_map__id_to_cpu(id));
 114
 115                 TEST_ASSERT_VAL("Core map - Socket ID doesn't match",
 116                         session->header.env.cpu[map->map[i]].socket_id ==
 117                                 cpu_map__id_to_socket(id));
 118
 119                 TEST_ASSERT_VAL("Core map - Die ID doesn't match",
 120                         session->header.env.cpu[map->map[i]].die_id == cpu_map__id_to_die(id));
 121         }
 122
 123         // Test that die ID contains socket and die
 124         for (i = 0; i < map->nr; i++) {
 125                 id = cpu_map__get_die(map, i, NULL);
 126                 TEST_ASSERT_VAL("Die map - Socket ID doesn't match",
 127                         session->header.env.cpu[map->map[i]].socket_id ==
 128                                 cpu_map__id_to_socket(id << 16));
 129
 130                 TEST_ASSERT_VAL("Die map - Die ID doesn't match",
 131                         session->header.env.cpu[map->map[i]].die_id ==
 132                                 cpu_map__id_to_die(id << 16));
 133         }
 134
 135         // Test that socket ID contains only socket
 136         for (i = 0; i < map->nr; i++) {
 137                 id = cpu_map__get_socket(map, i, NULL);
 138                 TEST_ASSERT_VAL("Socket map - Socket ID doesn't match",
 139                         session->header.env.cpu[map->map[i]].socket_id == id);
 140         }
 141
 142         // Test that node ID contains only node
 143         for (i = 0; i < map->nr; i++) {
 144                 id = cpu_map__get_node(map, i, NULL);
 145                 TEST_ASSERT_VAL("Node map - Node ID doesn't match",
 146                         cpu__get_node(map->map[i]) == id);
 147         }
 148         perf_session__delete(session);
 149
 150         return 0;
 151 }
 152
 153 int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
 154 {
 155         char path[PATH_MAX];
 156         struct perf_cpu_map *map;
 157         int ret = TEST_FAIL;
 158
 159         TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
 160
 161         pr_debug("templ file: %s\n", path);
 162
 163         if (session_write_header(path))
 164                 goto free_path;
 165
 166         map = perf_cpu_map__new(NULL);
 167         if (map == NULL) {
 168                 pr_debug("failed to get system cpumap\n");
 169                 goto free_path;
 170         }
 171
 172         ret = check_cpu_topology(path, map);
 173         perf_cpu_map__put(map);
 174
 175 free_path:
 176         unlink(path);
 177         return ret;
 178 }