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 #include "pmu-hybrid.h"
  25
  26 #define CHECK__(x) {                            \
  27         while ((x) < 0) {                       \
  28                 pr_debug(#x " failed!\n");      \
  29                 goto out_err;                   \
  30         }                                       \
  31 }
  32
  33 #define CHECK_NOT_NULL__(x) {                   \
  34         while ((x) == NULL) {                   \
  35                 pr_debug(#x " failed!\n");      \
  36                 goto out_err;                   \
  37         }                                       \
  38 }
  39
  40 /**
  41  * test__perf_time_to_tsc - test converting perf time to TSC.
  42  *
  43  * This function implements a test that checks that the conversion of perf time
  44  * to and from TSC is consistent with the order of events.  If the test passes
  45  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
  46  * supported then then the test passes but " (not supported)" is printed.
  47  */
  48 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
  49 {
  50         struct record_opts opts = {
  51                 .mmap_pages          = UINT_MAX,
  52                 .user_freq           = UINT_MAX,
  53                 .user_interval       = ULLONG_MAX,
  54                 .target              = {
  55                         .uses_mmap   = true,
  56                 },
  57                 .sample_time         = true,
  58         };
  59         struct perf_thread_map *threads = NULL;
  60         struct perf_cpu_map *cpus = NULL;
  61         struct evlist *evlist = NULL;
  62         struct evsel *evsel = NULL;
  63         int err = -1, ret, i;
  64         const char *comm1, *comm2;
  65         struct perf_tsc_conversion tc;
  66         struct perf_event_mmap_page *pc;
  67         union perf_event *event;
  68         u64 test_tsc, comm1_tsc, comm2_tsc;
  69         u64 test_time, comm1_time = 0, comm2_time = 0;
  70         struct mmap *md;
  71
  72         threads = thread_map__new(-1, getpid(), UINT_MAX);
  73         CHECK_NOT_NULL__(threads);
  74
  75         cpus = perf_cpu_map__new(NULL);
  76         CHECK_NOT_NULL__(cpus);
  77
  78         evlist = evlist__new();
  79         CHECK_NOT_NULL__(evlist);
  80
  81         perf_evlist__set_maps(&evlist->core, cpus, threads);
  82
  83         CHECK__(parse_events(evlist, "cycles:u", NULL));
  84
  85         evlist__config(evlist, &opts, NULL);
  86
  87         evsel = evlist__first(evlist);
  88
  89         evsel->core.attr.comm = 1;
  90         evsel->core.attr.disabled = 1;
  91         evsel->core.attr.enable_on_exec = 0;
  92
  93         /*
  94          * For hybrid "cycles:u", it creates two events.
  95          * Init the second evsel here.
  96          */
  97         if (perf_pmu__has_hybrid() && perf_pmu__hybrid_mounted("cpu_atom")) {
  98                 evsel = evsel__next(evsel);
  99                 evsel->core.attr.comm = 1;
 100                 evsel->core.attr.disabled = 1;
 101                 evsel->core.attr.enable_on_exec = 0;
 102         }
 103
 104         CHECK__(evlist__open(evlist));
 105
 106         CHECK__(evlist__mmap(evlist, UINT_MAX));
 107
 108         pc = evlist->mmap[0].core.base;
 109         ret = perf_read_tsc_conversion(pc, &tc);
 110         if (ret) {
 111                 if (ret == -EOPNOTSUPP) {
 112                         fprintf(stderr, " (not supported)");
 113                         return 0;
 114                 }
 115                 goto out_err;
 116         }
 117
 118         evlist__enable(evlist);
 119
 120         comm1 = "Test COMM 1";
 121         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
 122
 123         test_tsc = rdtsc();
 124
 125         comm2 = "Test COMM 2";
 126         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 127
 128         evlist__disable(evlist);
 129
 130         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 131                 md = &evlist->mmap[i];
 132                 if (perf_mmap__read_init(&md->core) < 0)
 133                         continue;
 134
 135                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 136                         struct perf_sample sample;
 137
 138                         if (event->header.type != PERF_RECORD_COMM ||
 139                             (pid_t)event->comm.pid != getpid() ||
 140                             (pid_t)event->comm.tid != getpid())
 141                                 goto next_event;
 142
 143                         if (strcmp(event->comm.comm, comm1) == 0) {
 144                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 145                                 comm1_time = sample.time;
 146                         }
 147                         if (strcmp(event->comm.comm, comm2) == 0) {
 148                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 149                                 comm2_time = sample.time;
 150                         }
 151 next_event:
 152                         perf_mmap__consume(&md->core);
 153                 }
 154                 perf_mmap__read_done(&md->core);
 155         }
 156
 157         if (!comm1_time || !comm2_time)
 158                 goto out_err;
 159
 160         test_time = tsc_to_perf_time(test_tsc, &tc);
 161         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 162         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 163
 164         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 165                  comm1_time, comm1_tsc);
 166         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 167                  test_time, test_tsc);
 168         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 169                  comm2_time, comm2_tsc);
 170
 171         if (test_time <= comm1_time ||
 172             test_time >= comm2_time)
 173                 goto out_err;
 174
 175         if (test_tsc <= comm1_tsc ||
 176             test_tsc >= comm2_tsc)
 177                 goto out_err;
 178
 179         err = 0;
 180
 181 out_err:
 182         evlist__delete(evlist);
 183         perf_cpu_map__put(cpus);
 184         perf_thread_map__put(threads);
 185         return err;
 186 }
 187
 188 bool test__tsc_is_supported(void)
 189 {
 190         /*
 191          * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.
 192          * Just enable the test for x86_64/i386 and Arm64 archs.
 193          */
 194 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
 195         return true;
 196 #else
 197         return false;
 198 #endif
 199 }