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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 #include <limits.h>
   5 #include <stdbool.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <linux/types.h>
   9 #include <sys/prctl.h>
  10 #include <perf/cpumap.h>
  11 #include <perf/evlist.h>
  12 #include <perf/mmap.h>
  13
  14 #include "debug.h"
  15 #include "parse-events.h"
  16 #include "evlist.h"
  17 #include "evsel.h"
  18 #include "thread_map.h"
  19 #include "record.h"
  20 #include "tsc.h"
  21 #include "mmap.h"
  22 #include "tests.h"
  23 #include "pmu.h"
  24
  25 #define CHECK__(x) {                            \
  26         while ((x) < 0) {                       \
  27                 pr_debug(#x " failed!\n");      \
  28                 goto out_err;                   \
  29         }                                       \
  30 }
  31
  32 #define CHECK_NOT_NULL__(x) {                   \
  33         while ((x) == NULL) {                   \
  34                 pr_debug(#x " failed!\n");      \
  35                 goto out_err;                   \
  36         }                                       \
  37 }
  38
  39 /**
  40  * test__perf_time_to_tsc - test converting perf time to TSC.
  41  *
  42  * This function implements a test that checks that the conversion of perf time
  43  * to and from TSC is consistent with the order of events.  If the test passes
  44  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
  45  * supported then then the test passes but " (not supported)" is printed.
  46  */
  47 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
  48 {
  49         struct record_opts opts = {
  50                 .mmap_pages          = UINT_MAX,
  51                 .user_freq           = UINT_MAX,
  52                 .user_interval       = ULLONG_MAX,
  53                 .target              = {
  54                         .uses_mmap   = true,
  55                 },
  56                 .sample_time         = true,
  57         };
  58         struct perf_thread_map *threads = NULL;
  59         struct perf_cpu_map *cpus = NULL;
  60         struct evlist *evlist = NULL;
  61         struct evsel *evsel = NULL;
  62         int err = -1, ret, i;
  63         const char *comm1, *comm2;
  64         struct perf_tsc_conversion tc;
  65         struct perf_event_mmap_page *pc;
  66         union perf_event *event;
  67         u64 test_tsc, comm1_tsc, comm2_tsc;
  68         u64 test_time, comm1_time = 0, comm2_time = 0;
  69         struct mmap *md;
  70
  71         threads = thread_map__new(-1, getpid(), UINT_MAX);
  72         CHECK_NOT_NULL__(threads);
  73
  74         cpus = perf_cpu_map__new(NULL);
  75         CHECK_NOT_NULL__(cpus);
  76
  77         evlist = evlist__new();
  78         CHECK_NOT_NULL__(evlist);
  79
  80         perf_evlist__set_maps(&evlist->core, cpus, threads);
  81
  82         CHECK__(parse_events(evlist, "cycles:u", NULL));
  83
  84         evlist__config(evlist, &opts, NULL);
  85
  86         evsel = evlist__first(evlist);
  87
  88         evsel->core.attr.comm = 1;
  89         evsel->core.attr.disabled = 1;
  90         evsel->core.attr.enable_on_exec = 0;
  91
  92         /*
  93          * For hybrid "cycles:u", it creates two events.
  94          * Init the second evsel here.
  95          */
  96         if (perf_pmu__has_hybrid()) {
  97                 evsel = evsel__next(evsel);
  98                 evsel->core.attr.comm = 1;
  99                 evsel->core.attr.disabled = 1;
 100                 evsel->core.attr.enable_on_exec = 0;
 101         }
 102
 103         CHECK__(evlist__open(evlist));
 104
 105         CHECK__(evlist__mmap(evlist, UINT_MAX));
 106
 107         pc = evlist->mmap[0].core.base;
 108         ret = perf_read_tsc_conversion(pc, &tc);
 109         if (ret) {
 110                 if (ret == -EOPNOTSUPP) {
 111                         fprintf(stderr, " (not supported)");
 112                         return 0;
 113                 }
 114                 goto out_err;
 115         }
 116
 117         evlist__enable(evlist);
 118
 119         comm1 = "Test COMM 1";
 120         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
 121
 122         test_tsc = rdtsc();
 123
 124         comm2 = "Test COMM 2";
 125         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 126
 127         evlist__disable(evlist);
 128
 129         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 130                 md = &evlist->mmap[i];
 131                 if (perf_mmap__read_init(&md->core) < 0)
 132                         continue;
 133
 134                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 135                         struct perf_sample sample;
 136
 137                         if (event->header.type != PERF_RECORD_COMM ||
 138                             (pid_t)event->comm.pid != getpid() ||
 139                             (pid_t)event->comm.tid != getpid())
 140                                 goto next_event;
 141
 142                         if (strcmp(event->comm.comm, comm1) == 0) {
 143                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 144                                 comm1_time = sample.time;
 145                         }
 146                         if (strcmp(event->comm.comm, comm2) == 0) {
 147                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 148                                 comm2_time = sample.time;
 149                         }
 150 next_event:
 151                         perf_mmap__consume(&md->core);
 152                 }
 153                 perf_mmap__read_done(&md->core);
 154         }
 155
 156         if (!comm1_time || !comm2_time)
 157                 goto out_err;
 158
 159         test_time = tsc_to_perf_time(test_tsc, &tc);
 160         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 161         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 162
 163         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 164                  comm1_time, comm1_tsc);
 165         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 166                  test_time, test_tsc);
 167         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 168                  comm2_time, comm2_tsc);
 169
 170         if (test_time <= comm1_time ||
 171             test_time >= comm2_time)
 172                 goto out_err;
 173
 174         if (test_tsc <= comm1_tsc ||
 175             test_tsc >= comm2_tsc)
 176                 goto out_err;
 177
 178         err = 0;
 179
 180 out_err:
 181         evlist__delete(evlist);
 182         perf_cpu_map__put(cpus);
 183         perf_thread_map__put(threads);
 184         return err;
 185 }
 186
 187 bool test__tsc_is_supported(void)
 188 {
 189         /*
 190          * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.
 191          * Just enable the test for x86_64/i386 and Arm64 archs.
 192          */
 193 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
 194         return true;
 195 #else
 196         return false;
 197 #endif
 198 }