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

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