Quelle  topology.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <perf/cpumap.h>
#include "cpumap.h"
#include "tests.h"
#include "session.h"
#include "evlist.h"
#include "debug.h"
#include "pmus.h"
#include <linux/err.h>

#define TEMPL "/tmp/perf-test-XXXXXX"
#define DATA_SIZE 10

static int get_temp(char *path)
{
 int fd;

 strcpy(path, TEMPL);

 fd = mkstemp(path);
 if (fd < 0) {
  perror("mkstemp failed");
  return -1;
 }

 close(fd);
 return 0;
}

static int session_write_header(char *path)
{
 struct perf_session *session;
 struct perf_data data = {
  .path = path,
  .mode = PERF_DATA_MODE_WRITE,
 };

 session = perf_session__new(&data, NULL);
 TEST_ASSERT_VAL("can't get session", !IS_ERR(session));

 session->evlist = evlist__new_default();
 TEST_ASSERT_VAL("can't get evlist", session->evlist);
 session->evlist->session = session;

 perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
 perf_header__set_feat(&session->header, HEADER_NRCPUS);
 perf_header__set_feat(&session->header, HEADER_ARCH);

 session->header.data_size += DATA_SIZE;

 TEST_ASSERT_VAL("failed to write header",
   !perf_session__write_header(session, session->evlist, data.file.fd, true));

 evlist__delete(session->evlist);
 perf_session__delete(session);

 return 0;
}

static int check_cpu_topology(char *path, struct perf_cpu_map *map)
{
 struct perf_session *session;
 struct perf_data data = {
  .path = path,
  .mode = PERF_DATA_MODE_READ,
 };
 int i;
 struct aggr_cpu_id id;
 struct perf_cpu cpu;
 struct perf_env *env;

 session = perf_session__new(&data, NULL);
 TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
 env = perf_session__env(session);
 cpu__setup_cpunode_map();

 /* On platforms with large numbers of CPUs process_cpu_topology()
 * might issue an error while reading the perf.data file section
 * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
 * cpu is a NULL pointer.
 * Example: On s390
 *   CPU 0 is on core_id 0 and physical_package_id 6
 *   CPU 1 is on core_id 1 and physical_package_id 3
 *
 *   Core_id and physical_package_id are platform and architecture
 *   dependent and might have higher numbers than the CPU id.
 *   This actually depends on the configuration.
 *
 *  In this case process_cpu_topology() prints error message:
 *  "socket_id number is too big. You may need to upgrade the
 *  perf tool."
 *
 *  This is the reason why this test might be skipped. aarch64 and
 *  s390 always write this part of the header, even when the above
 *  condition is true (see do_core_id_test in header.c). So always
 *  run this test on those platforms.
 */
 if (!env->cpu && strncmp(env->arch, "s390", 4) && strncmp(env->arch, "aarch64", 7))
  return TEST_SKIP;

 /*
 * In powerpc pSeries platform, not all the topology information
 * are exposed via sysfs. Due to restriction, detail like
 * physical_package_id will be set to -1. Hence skip this
 * test if physical_package_id returns -1 for cpu from perf_cpu_map.
 */
 if (!strncmp(env->arch, "ppc64le", 7)) {
  if (cpu__get_socket_id(perf_cpu_map__cpu(map, 0)) == -1)
   return TEST_SKIP;
 }

 TEST_ASSERT_VAL("Session header CPU map not set", env->cpu);

 for (i = 0; i < env->nr_cpus_avail; i++) {
  cpu.cpu = i;
  if (!perf_cpu_map__has(map, cpu))
   continue;
  pr_debug("CPU %d, core %d, socket %d\n", i,
    env->cpu[i].core_id,
    env->cpu[i].socket_id);
 }

 // Test that CPU ID contains socket, die, core and CPU
 perf_cpu_map__for_each_cpu(cpu, i, map) {
  id = aggr_cpu_id__cpu(cpu, NULL);
  TEST_ASSERT_VAL("Cpu map - CPU ID doesn't match",
    cpu.cpu == id.cpu.cpu);

  TEST_ASSERT_VAL("Cpu map - Core ID doesn't match",
   env->cpu[cpu.cpu].core_id == id.core);
  TEST_ASSERT_VAL("Cpu map - Socket ID doesn't match",
   env->cpu[cpu.cpu].socket_id == id.socket);

  TEST_ASSERT_VAL("Cpu map - Die ID doesn't match",
   env->cpu[cpu.cpu].die_id == id.die);
  TEST_ASSERT_VAL("Cpu map - Node ID is set", id.node == -1);
  TEST_ASSERT_VAL("Cpu map - Thread IDX is set", id.thread_idx == -1);
 }

 // Test that core ID contains socket, die and core
 perf_cpu_map__for_each_cpu(cpu, i, map) {
  id = aggr_cpu_id__core(cpu, NULL);
  TEST_ASSERT_VAL("Core map - Core ID doesn't match",
   env->cpu[cpu.cpu].core_id == id.core);

  TEST_ASSERT_VAL("Core map - Socket ID doesn't match",
   env->cpu[cpu.cpu].socket_id == id.socket);

  TEST_ASSERT_VAL("Core map - Die ID doesn't match",
   env->cpu[cpu.cpu].die_id == id.die);
  TEST_ASSERT_VAL("Core map - Node ID is set", id.node == -1);
  TEST_ASSERT_VAL("Core map - Thread IDX is set", id.thread_idx == -1);
 }

 // Test that die ID contains socket and die
 perf_cpu_map__for_each_cpu(cpu, i, map) {
  id = aggr_cpu_id__die(cpu, NULL);
  TEST_ASSERT_VAL("Die map - Socket ID doesn't match",
   env->cpu[cpu.cpu].socket_id == id.socket);

  TEST_ASSERT_VAL("Die map - Die ID doesn't match",
   env->cpu[cpu.cpu].die_id == id.die);

  TEST_ASSERT_VAL("Die map - Node ID is set", id.node == -1);
  TEST_ASSERT_VAL("Die map - Core is set", id.core == -1);
  TEST_ASSERT_VAL("Die map - CPU is set", id.cpu.cpu == -1);
  TEST_ASSERT_VAL("Die map - Thread IDX is set", id.thread_idx == -1);
 }

 // Test that socket ID contains only socket
 perf_cpu_map__for_each_cpu(cpu, i, map) {
  id = aggr_cpu_id__socket(cpu, NULL);
  TEST_ASSERT_VAL("Socket map - Socket ID doesn't match",
   env->cpu[cpu.cpu].socket_id == id.socket);

  TEST_ASSERT_VAL("Socket map - Node ID is set", id.node == -1);
  TEST_ASSERT_VAL("Socket map - Die ID is set", id.die == -1);
  TEST_ASSERT_VAL("Socket map - Core is set", id.core == -1);
  TEST_ASSERT_VAL("Socket map - CPU is set", id.cpu.cpu == -1);
  TEST_ASSERT_VAL("Socket map - Thread IDX is set", id.thread_idx == -1);
 }

 // Test that node ID contains only node
 perf_cpu_map__for_each_cpu(cpu, i, map) {
  id = aggr_cpu_id__node(cpu, NULL);
  TEST_ASSERT_VAL("Node map - Node ID doesn't match",
    cpu__get_node(cpu) == id.node);
  TEST_ASSERT_VAL("Node map - Socket is set", id.socket == -1);
  TEST_ASSERT_VAL("Node map - Die ID is set", id.die == -1);
  TEST_ASSERT_VAL("Node map - Core is set", id.core == -1);
  TEST_ASSERT_VAL("Node map - CPU is set", id.cpu.cpu == -1);
  TEST_ASSERT_VAL("Node map - Thread IDX is set", id.thread_idx == -1);
 }
 perf_session__delete(session);

 return 0;
}

static int test__session_topology(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
{
 char path[PATH_MAX];
 struct perf_cpu_map *map;
 int ret = TEST_FAIL;

 TEST_ASSERT_VAL("can't get templ file", !get_temp(path));

 pr_debug("templ file: %s\n", path);

 if (session_write_header(path))
  goto free_path;

 map = perf_cpu_map__new_online_cpus();
 if (map == NULL) {
  pr_debug("failed to get system cpumap\n");
  goto free_path;
 }

 ret = check_cpu_topology(path, map);
 perf_cpu_map__put(map);

free_path:
 unlink(path);
 return ret;
}

DEFINE_SUITE("Session topology", session_topology);