tools/perf/tests/openat-syscall-tp-fields.c

   1 #include <linux/err.h>
   2 #include "perf.h"
   3 #include "evlist.h"
   4 #include "evsel.h"
   5 #include "thread_map.h"
   6 #include "tests.h"
   7 #include "debug.h"
   8
   9 #ifndef O_DIRECTORY
  10 #define O_DIRECTORY    00200000
  11 #endif
  12 #ifndef AT_FDCWD
  13 #define AT_FDCWD       -100
  14 #endif
  15
  16 int test__syscall_openat_tp_fields(int subtest __maybe_unused)
  17 {
  18         struct record_opts opts = {
  19                 .target = {
  20                         .uid = UINT_MAX,
  21                         .uses_mmap = true,
  22                 },
  23                 .no_buffering = true,
  24                 .freq         = 1,
  25                 .mmap_pages   = 256,
  26                 .raw_samples  = true,
  27         };
  28         const char *filename = "/etc/passwd";
  29         int flags = O_RDONLY | O_DIRECTORY;
  30         struct perf_evlist *evlist = perf_evlist__new();
  31         struct perf_evsel *evsel;
  32         int err = -1, i, nr_events = 0, nr_polls = 0;
  33         char sbuf[STRERR_BUFSIZE];
  34
  35         if (evlist == NULL) {
  36                 pr_debug("%s: perf_evlist__new\n", __func__);
  37                 goto out;
  38         }
  39
  40         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  41         if (IS_ERR(evsel)) {
  42                 pr_debug("%s: perf_evsel__newtp\n", __func__);
  43                 goto out_delete_evlist;
  44         }
  45
  46         perf_evlist__add(evlist, evsel);
  47
  48         err = perf_evlist__create_maps(evlist, &opts.target);
  49         if (err < 0) {
  50                 pr_debug("%s: perf_evlist__create_maps\n", __func__);
  51                 goto out_delete_evlist;
  52         }
  53
  54         perf_evsel__config(evsel, &opts, NULL);
  55
  56         thread_map__set_pid(evlist->threads, 0, getpid());
  57
  58         err = perf_evlist__open(evlist);
  59         if (err < 0) {
  60                 pr_debug("perf_evlist__open: %s\n",
  61                          str_error_r(errno, sbuf, sizeof(sbuf)));
  62                 goto out_delete_evlist;
  63         }
  64
  65         err = perf_evlist__mmap(evlist, UINT_MAX, false);
  66         if (err < 0) {
  67                 pr_debug("perf_evlist__mmap: %s\n",
  68                          str_error_r(errno, sbuf, sizeof(sbuf)));
  69                 goto out_delete_evlist;
  70         }
  71
  72         perf_evlist__enable(evlist);
  73
  74         /*
  75          * Generate the event:
  76          */
  77         openat(AT_FDCWD, filename, flags);
  78
  79         while (1) {
  80                 int before = nr_events;
  81
  82                 for (i = 0; i < evlist->nr_mmaps; i++) {
  83                         union perf_event *event;
  84
  85                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
  86                                 const u32 type = event->header.type;
  87                                 int tp_flags;
  88                                 struct perf_sample sample;
  89
  90                                 ++nr_events;
  91
  92                                 if (type != PERF_RECORD_SAMPLE) {
  93                                         perf_evlist__mmap_consume(evlist, i);
  94                                         continue;
  95                                 }
  96
  97                                 err = perf_evsel__parse_sample(evsel, event, &sample);
  98                                 if (err) {
  99                                         pr_debug("Can't parse sample, err = %d\n", err);
 100                                         goto out_delete_evlist;
 101                                 }
 102
 103                                 tp_flags = perf_evsel__intval(evsel, &sample, "flags");
 104
 105                                 if (flags != tp_flags) {
 106                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 107                                                  __func__, flags, tp_flags);
 108                                         goto out_delete_evlist;
 109                                 }
 110
 111                                 goto out_ok;
 112                         }
 113                 }
 114
 115                 if (nr_events == before)
 116                         perf_evlist__poll(evlist, 10);
 117
 118                 if (++nr_polls > 5) {
 119                         pr_debug("%s: no events!\n", __func__);
 120                         goto out_delete_evlist;
 121                 }
 122         }
 123 out_ok:
 124         err = 0;
 125 out_delete_evlist:
 126         perf_evlist__delete(evlist);
 127 out:
 128         return err;
 129 }