tools/perf/arch/x86/tests/perf-time-to-tsc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 #include <stdio.h>
   5 #include <unistd.h>
   6 #include <linux/types.h>
   7 #include <sys/prctl.h>
   8
   9 #include "parse-events.h"
  10 #include "evlist.h"
  11 #include "evsel.h"
  12 #include "thread_map.h"
  13 #include "cpumap.h"
  14 #include "tsc.h"
  15 #include "tests/tests.h"
  16
  17 #include "arch-tests.h"
  18
  19 #define CHECK__(x) {                            \
  20         while ((x) < 0) {                       \
  21                 pr_debug(#x " failed!\n");      \
  22                 goto out_err;                   \
  23         }                                       \
  24 }
  25
  26 #define CHECK_NOT_NULL__(x) {                   \
  27         while ((x) == NULL) {                   \
  28                 pr_debug(#x " failed!\n");      \
  29                 goto out_err;                   \
  30         }                                       \
  31 }
  32
  33 /**
  34  * test__perf_time_to_tsc - test converting perf time to TSC.
  35  *
  36  * This function implements a test that checks that the conversion of perf time
  37  * to and from TSC is consistent with the order of events.  If the test passes
  38  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
  39  * supported then then the test passes but " (not supported)" is printed.
  40  */
  41 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
  42 {
  43         struct record_opts opts = {
  44                 .mmap_pages          = UINT_MAX,
  45                 .user_freq           = UINT_MAX,
  46                 .user_interval       = ULLONG_MAX,
  47                 .target              = {
  48                         .uses_mmap   = true,
  49                 },
  50                 .sample_time         = true,
  51         };
  52         struct thread_map *threads = NULL;
  53         struct cpu_map *cpus = NULL;
  54         struct perf_evlist *evlist = NULL;
  55         struct perf_evsel *evsel = NULL;
  56         int err = -1, ret, i;
  57         const char *comm1, *comm2;
  58         struct perf_tsc_conversion tc;
  59         struct perf_event_mmap_page *pc;
  60         union perf_event *event;
  61         u64 test_tsc, comm1_tsc, comm2_tsc;
  62         u64 test_time, comm1_time = 0, comm2_time = 0;
  63         struct perf_mmap *md;
  64
  65         threads = thread_map__new(-1, getpid(), UINT_MAX);
  66         CHECK_NOT_NULL__(threads);
  67
  68         cpus = cpu_map__new(NULL);
  69         CHECK_NOT_NULL__(cpus);
  70
  71         evlist = perf_evlist__new();
  72         CHECK_NOT_NULL__(evlist);
  73
  74         perf_evlist__set_maps(evlist, cpus, threads);
  75
  76         CHECK__(parse_events(evlist, "cycles:u", NULL));
  77
  78         perf_evlist__config(evlist, &opts, NULL);
  79
  80         evsel = perf_evlist__first(evlist);
  81
  82         evsel->attr.comm = 1;
  83         evsel->attr.disabled = 1;
  84         evsel->attr.enable_on_exec = 0;
  85
  86         CHECK__(perf_evlist__open(evlist));
  87
  88         CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
  89
  90         pc = evlist->mmap[0].base;
  91         ret = perf_read_tsc_conversion(pc, &tc);
  92         if (ret) {
  93                 if (ret == -EOPNOTSUPP) {
  94                         fprintf(stderr, " (not supported)");
  95                         return 0;
  96                 }
  97                 goto out_err;
  98         }
  99
 100         perf_evlist__enable(evlist);
 101
 102         comm1 = "Test COMM 1";
 103         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
 104
 105         test_tsc = rdtsc();
 106
 107         comm2 = "Test COMM 2";
 108         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 109
 110         perf_evlist__disable(evlist);
 111
 112         for (i = 0; i < evlist->nr_mmaps; i++) {
 113                 md = &evlist->mmap[i];
 114                 if (perf_mmap__read_init(md) < 0)
 115                         continue;
 116
 117                 while ((event = perf_mmap__read_event(md)) != NULL) {
 118                         struct perf_sample sample;
 119
 120                         if (event->header.type != PERF_RECORD_COMM ||
 121                             (pid_t)event->comm.pid != getpid() ||
 122                             (pid_t)event->comm.tid != getpid())
 123                                 goto next_event;
 124
 125                         if (strcmp(event->comm.comm, comm1) == 0) {
 126                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 127                                                                  &sample));
 128                                 comm1_time = sample.time;
 129                         }
 130                         if (strcmp(event->comm.comm, comm2) == 0) {
 131                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 132                                                                  &sample));
 133                                 comm2_time = sample.time;
 134                         }
 135 next_event:
 136                         perf_mmap__consume(md);
 137                 }
 138                 perf_mmap__read_done(md);
 139         }
 140
 141         if (!comm1_time || !comm2_time)
 142                 goto out_err;
 143
 144         test_time = tsc_to_perf_time(test_tsc, &tc);
 145         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 146         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 147
 148         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 149                  comm1_time, comm1_tsc);
 150         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 151                  test_time, test_tsc);
 152         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 153                  comm2_time, comm2_tsc);
 154
 155         if (test_time <= comm1_time ||
 156             test_time >= comm2_time)
 157                 goto out_err;
 158
 159         if (test_tsc <= comm1_tsc ||
 160             test_tsc >= comm2_tsc)
 161                 goto out_err;
 162
 163         err = 0;
 164
 165 out_err:
 166         perf_evlist__delete(evlist);
 167         return err;
 168 }