kernel/tools/perf/tests/open-syscall-tp-fields.c

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