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 <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 "util/mmap.h"
  22 #include "tests/tests.h"
  23
  24 #include "arch-tests.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         perf_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         CHECK__(evlist__open(evlist));
  94
  95         CHECK__(evlist__mmap(evlist, UINT_MAX));
  96
  97         pc = evlist->mmap[0].core.base;
  98         ret = perf_read_tsc_conversion(pc, &tc);
  99         if (ret) {
 100                 if (ret == -EOPNOTSUPP) {
 101                         fprintf(stderr, " (not supported)");
 102                         return 0;
 103                 }
 104                 goto out_err;
 105         }
 106
 107         evlist__enable(evlist);
 108
 109         comm1 = "Test COMM 1";
 110         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
 111
 112         test_tsc = rdtsc();
 113
 114         comm2 = "Test COMM 2";
 115         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 116
 117         evlist__disable(evlist);
 118
 119         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 120                 md = &evlist->mmap[i];
 121                 if (perf_mmap__read_init(&md->core) < 0)
 122                         continue;
 123
 124                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 125                         struct perf_sample sample;
 126
 127                         if (event->header.type != PERF_RECORD_COMM ||
 128                             (pid_t)event->comm.pid != getpid() ||
 129                             (pid_t)event->comm.tid != getpid())
 130                                 goto next_event;
 131
 132                         if (strcmp(event->comm.comm, comm1) == 0) {
 133                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 134                                 comm1_time = sample.time;
 135                         }
 136                         if (strcmp(event->comm.comm, comm2) == 0) {
 137                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
 138                                 comm2_time = sample.time;
 139                         }
 140 next_event:
 141                         perf_mmap__consume(&md->core);
 142                 }
 143                 perf_mmap__read_done(&md->core);
 144         }
 145
 146         if (!comm1_time || !comm2_time)
 147                 goto out_err;
 148
 149         test_time = tsc_to_perf_time(test_tsc, &tc);
 150         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 151         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 152
 153         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 154                  comm1_time, comm1_tsc);
 155         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 156                  test_time, test_tsc);
 157         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 158                  comm2_time, comm2_tsc);
 159
 160         if (test_time <= comm1_time ||
 161             test_time >= comm2_time)
 162                 goto out_err;
 163
 164         if (test_tsc <= comm1_tsc ||
 165             test_tsc >= comm2_tsc)
 166                 goto out_err;
 167
 168         err = 0;
 169
 170 out_err:
 171         evlist__delete(evlist);
 172         return err;
 173 }