Quelle  test-evsel.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <linux/perf_event.h>
#include <linux/kernel.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <perf/evsel.h>
#include <internal/evsel.h>
#include <internal/tests.h>
#include "tests.h"

static int libperf_print(enum libperf_print_level level,
    const char *fmt, va_list ap)
{
 return vfprintf(stderr, fmt, ap);
}

static int test_stat_cpu(void)
{
 struct perf_cpu_map *cpus;
 struct perf_evsel *evsel;
 struct perf_event_attr attr = {
  .type = PERF_TYPE_SOFTWARE,
  .config = PERF_COUNT_SW_CPU_CLOCK,
 };
 int err, idx;

 cpus = perf_cpu_map__new_online_cpus();
 __T("failed to create cpus", cpus);

 evsel = perf_evsel__new(&attr);
 __T("failed to create evsel", evsel);

 err = perf_evsel__open(evsel, cpus, NULL);
 __T("failed to open evsel", err == 0);

 for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) {
  struct perf_counts_values counts = { .val = 0 };

  perf_evsel__read(evsel, idx, 0, &counts);
  __T("failed to read value for evsel", counts.val != 0);
 }

 perf_evsel__close(evsel);
 perf_evsel__delete(evsel);

 perf_cpu_map__put(cpus);
 return 0;
}

static int test_stat_thread(void)
{
 struct perf_counts_values counts = { .val = 0 };
 struct perf_thread_map *threads;
 struct perf_evsel *evsel;
 struct perf_event_attr attr = {
  .type = PERF_TYPE_SOFTWARE,
  .config = PERF_COUNT_SW_TASK_CLOCK,
 };
 int err;

 threads = perf_thread_map__new_dummy();
 __T("failed to create threads", threads);

 perf_thread_map__set_pid(threads, 0, 0);

 evsel = perf_evsel__new(&attr);
 __T("failed to create evsel", evsel);

 err = perf_evsel__open(evsel, NULL, threads);
 __T("failed to open evsel", err == 0);

 perf_evsel__read(evsel, 0, 0, &counts);
 __T("failed to read value for evsel", counts.val != 0);

 perf_evsel__close(evsel);
 perf_evsel__delete(evsel);

 perf_thread_map__put(threads);
 return 0;
}

static int test_stat_thread_enable(void)
{
 struct perf_counts_values counts = { .val = 0 };
 struct perf_thread_map *threads;
 struct perf_evsel *evsel;
 struct perf_event_attr attr = {
  .type   = PERF_TYPE_SOFTWARE,
  .config   = PERF_COUNT_SW_TASK_CLOCK,
  .disabled = 1,
 };
 int err;

 threads = perf_thread_map__new_dummy();
 __T("failed to create threads", threads);

 perf_thread_map__set_pid(threads, 0, 0);

 evsel = perf_evsel__new(&attr);
 __T("failed to create evsel", evsel);

 err = perf_evsel__open(evsel, NULL, threads);
 __T("failed to open evsel", err == 0);

 perf_evsel__read(evsel, 0, 0, &counts);
 __T("failed to read value for evsel", counts.val == 0);

 err = perf_evsel__enable(evsel);
 __T("failed to enable evsel", err == 0);

 perf_evsel__read(evsel, 0, 0, &counts);
 __T("failed to read value for evsel", counts.val != 0);

 err = perf_evsel__disable(evsel);
 __T("failed to enable evsel", err == 0);

 perf_evsel__close(evsel);
 perf_evsel__delete(evsel);

 perf_thread_map__put(threads);
 return 0;
}

static int test_stat_user_read(int event)
{
 struct perf_counts_values counts = { .val = 0 };
 struct perf_thread_map *threads;
 struct perf_evsel *evsel;
 struct perf_event_mmap_page *pc;
 struct perf_event_attr attr = {
  .type = PERF_TYPE_HARDWARE,
  .config = event,
#ifdef __aarch64__
  .config1 = 0x2,  /* Request user access */
#endif
 };
 int err, i;

 threads = perf_thread_map__new_dummy();
 __T("failed to create threads", threads);

 perf_thread_map__set_pid(threads, 0, 0);

 evsel = perf_evsel__new(&attr);
 __T("failed to create evsel", evsel);

 err = perf_evsel__open(evsel, NULL, threads);
 __T("failed to open evsel", err == 0);

 err = perf_evsel__mmap(evsel, 0);
 __T("failed to mmap evsel", err == 0);

 pc = perf_evsel__mmap_base(evsel, 0, 0);
 __T("failed to get mmapped address", pc);

#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
 __T("userspace counter access not supported", pc->cap_user_rdpmc);
 __T("userspace counter access not enabled", pc->index);
 __T("userspace counter width not set", pc->pmc_width >= 32);
#endif

 perf_evsel__read(evsel, 0, 0, &counts);
 __T("failed to read value for evsel", counts.val != 0);

 for (i = 0; i < 5; i++) {
  volatile int count = 0x10000 << i;
  __u64 start, end, last = 0;

  __T_VERBOSE("\tloop = %u, ", count);

  perf_evsel__read(evsel, 0, 0, &counts);
  start = counts.val;

  while (count--) ;

  perf_evsel__read(evsel, 0, 0, &counts);
  end = counts.val;

  __T("invalid counter data", (end - start) > last);
  last = end - start;
  __T_VERBOSE("count = %llu\n", end - start);
 }

 perf_evsel__munmap(evsel);
 perf_evsel__close(evsel);
 perf_evsel__delete(evsel);

 perf_thread_map__put(threads);
 return 0;
}

static int test_stat_read_format_single(struct perf_event_attr *attr, struct perf_thread_map *threads)
{
 struct perf_evsel *evsel;
 struct perf_counts_values counts;
 volatile int count = 0x100000;
 int err;

 evsel = perf_evsel__new(attr);
 __T("failed to create evsel", evsel);

 /* skip old kernels that don't support the format */
 err = perf_evsel__open(evsel, NULL, threads);
 if (err < 0)
  return 0;

 while (count--) ;

 memset(&counts, -1, sizeof(counts));
 perf_evsel__read(evsel, 0, 0, &counts);

 __T("failed to read value", counts.val);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  __T("failed to read TOTAL_TIME_ENABLED", counts.ena);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  __T("failed to read TOTAL_TIME_RUNNING", counts.run);
 if (attr->read_format & PERF_FORMAT_ID)
  __T("failed to read ID", counts.id);
 if (attr->read_format & PERF_FORMAT_LOST)
  __T("failed to read LOST", counts.lost == 0);

 perf_evsel__close(evsel);
 perf_evsel__delete(evsel);
 return 0;
}

static int test_stat_read_format_group(struct perf_event_attr *attr, struct perf_thread_map *threads)
{
 struct perf_evsel *leader, *member;
 struct perf_counts_values counts;
 volatile int count = 0x100000;
 int err;

 attr->read_format |= PERF_FORMAT_GROUP;
 leader = perf_evsel__new(attr);
 __T("failed to create leader", leader);

 attr->read_format &= ~PERF_FORMAT_GROUP;
 member = perf_evsel__new(attr);
 __T("failed to create member", member);

 member->leader = leader;
 leader->nr_members = 2;

 /* skip old kernels that don't support the format */
 err = perf_evsel__open(leader, NULL, threads);
 if (err < 0)
  return 0;
 err = perf_evsel__open(member, NULL, threads);
 if (err < 0)
  return 0;

 while (count--) ;

 memset(&counts, -1, sizeof(counts));
 perf_evsel__read(leader, 0, 0, &counts);

 __T("failed to read leader value", counts.val);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  __T("failed to read leader TOTAL_TIME_ENABLED", counts.ena);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  __T("failed to read leader TOTAL_TIME_RUNNING", counts.run);
 if (attr->read_format & PERF_FORMAT_ID)
  __T("failed to read leader ID", counts.id);
 if (attr->read_format & PERF_FORMAT_LOST)
  __T("failed to read leader LOST", counts.lost == 0);

 memset(&counts, -1, sizeof(counts));
 perf_evsel__read(member, 0, 0, &counts);

 __T("failed to read member value", counts.val);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  __T("failed to read member TOTAL_TIME_ENABLED", counts.ena);
 if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  __T("failed to read member TOTAL_TIME_RUNNING", counts.run);
 if (attr->read_format & PERF_FORMAT_ID)
  __T("failed to read member ID", counts.id);
 if (attr->read_format & PERF_FORMAT_LOST)
  __T("failed to read member LOST", counts.lost == 0);

 perf_evsel__close(member);
 perf_evsel__close(leader);
 perf_evsel__delete(member);
 perf_evsel__delete(leader);
 return 0;
}

static int test_stat_read_format(void)
{
 struct perf_thread_map *threads;
 struct perf_event_attr attr = {
  .type = PERF_TYPE_SOFTWARE,
  .config = PERF_COUNT_SW_TASK_CLOCK,
 };
 int err, i;

#define FMT(_fmt)  PERF_FORMAT_ ## _fmt
#define FMT_TIME  (FMT(TOTAL_TIME_ENABLED) | FMT(TOTAL_TIME_RUNNING))

 uint64_t test_formats [] = {
  0,
  FMT_TIME,
  FMT(ID),
  FMT(LOST),
  FMT_TIME | FMT(ID),
  FMT_TIME | FMT(LOST),
  FMT_TIME | FMT(ID) | FMT(LOST),
  FMT(ID) | FMT(LOST),
 };

#undef FMT
#undef FMT_TIME

 threads = perf_thread_map__new_dummy();
 __T("failed to create threads", threads);

 perf_thread_map__set_pid(threads, 0, 0);

 for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
  attr.read_format = test_formats[i];
  __T_VERBOSE("testing single read with read_format: %lx\n",
       (unsigned long)test_formats[i]);

  err = test_stat_read_format_single(&attr, threads);
  __T("failed to read single format", err == 0);
 }

 perf_thread_map__put(threads);

 threads = perf_thread_map__new_array(2, NULL);
 __T("failed to create threads", threads);

 perf_thread_map__set_pid(threads, 0, 0);
 perf_thread_map__set_pid(threads, 1, 0);

 for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
  attr.read_format = test_formats[i];
  __T_VERBOSE("testing group read with read_format: %lx\n",
       (unsigned long)test_formats[i]);

  err = test_stat_read_format_group(&attr, threads);
  __T("failed to read group format", err == 0);
 }

 perf_thread_map__put(threads);
 return 0;
}

int test_evsel(int argc, char **argv)
{
 __T_START;

 libperf_init(libperf_print);

 test_stat_cpu();
 test_stat_thread();
 test_stat_thread_enable();
 test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
 test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
 test_stat_read_format();

 __T_END;
 return tests_failed == 0 ? 0 : -1;
}