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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/err.h>
   3 #include "perf.h"
   4 #include "evlist.h"
   5 #include "evsel.h"
   6 #include "thread_map.h"
   7 #include "tests.h"
   8 #include "debug.h"
   9 #include <errno.h>
  10
  11 #ifndef O_DIRECTORY
  12 #define O_DIRECTORY    00200000
  13 #endif
  14 #ifndef AT_FDCWD
  15 #define AT_FDCWD       -100
  16 #endif
  17
  18 int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
  19 {
  20         struct record_opts opts = {
  21                 .target = {
  22                         .uid = UINT_MAX,
  23                         .uses_mmap = true,
  24                 },
  25                 .no_buffering = true,
  26                 .freq         = 1,
  27                 .mmap_pages   = 256,
  28                 .raw_samples  = true,
  29         };
  30         const char *filename = "/etc/passwd";
  31         int flags = O_RDONLY | O_DIRECTORY;
  32         struct perf_evlist *evlist = perf_evlist__new();
  33         struct perf_evsel *evsel;
  34         int err = -1, i, nr_events = 0, nr_polls = 0;
  35         char sbuf[STRERR_BUFSIZE];
  36
  37         if (evlist == NULL) {
  38                 pr_debug("%s: perf_evlist__new\n", __func__);
  39                 goto out;
  40         }
  41
  42         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  43         if (IS_ERR(evsel)) {
  44                 pr_debug("%s: perf_evsel__newtp\n", __func__);
  45                 goto out_delete_evlist;
  46         }
  47
  48         perf_evlist__add(evlist, evsel);
  49
  50         err = perf_evlist__create_maps(evlist, &opts.target);
  51         if (err < 0) {
  52                 pr_debug("%s: perf_evlist__create_maps\n", __func__);
  53                 goto out_delete_evlist;
  54         }
  55
  56         perf_evsel__config(evsel, &opts, NULL);
  57
  58         thread_map__set_pid(evlist->threads, 0, getpid());
  59
  60         err = perf_evlist__open(evlist);
  61         if (err < 0) {
  62                 pr_debug("perf_evlist__open: %s\n",
  63                          str_error_r(errno, sbuf, sizeof(sbuf)));
  64                 goto out_delete_evlist;
  65         }
  66
  67         err = perf_evlist__mmap(evlist, UINT_MAX, false);
  68         if (err < 0) {
  69                 pr_debug("perf_evlist__mmap: %s\n",
  70                          str_error_r(errno, sbuf, sizeof(sbuf)));
  71                 goto out_delete_evlist;
  72         }
  73
  74         perf_evlist__enable(evlist);
  75
  76         /*
  77          * Generate the event:
  78          */
  79         openat(AT_FDCWD, filename, flags);
  80
  81         while (1) {
  82                 int before = nr_events;
  83
  84                 for (i = 0; i < evlist->nr_mmaps; i++) {
  85                         union perf_event *event;
  86
  87                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
  88                                 const u32 type = event->header.type;
  89                                 int tp_flags;
  90                                 struct perf_sample sample;
  91
  92                                 ++nr_events;
  93
  94                                 if (type != PERF_RECORD_SAMPLE) {
  95                                         perf_evlist__mmap_consume(evlist, i);
  96                                         continue;
  97                                 }
  98
  99                                 err = perf_evsel__parse_sample(evsel, event, &sample);
 100                                 if (err) {
 101                                         pr_debug("Can't parse sample, err = %d\n", err);
 102                                         goto out_delete_evlist;
 103                                 }
 104
 105                                 tp_flags = perf_evsel__intval(evsel, &sample, "flags");
 106
 107                                 if (flags != tp_flags) {
 108                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 109                                                  __func__, flags, tp_flags);
 110                                         goto out_delete_evlist;
 111                                 }
 112
 113                                 goto out_ok;
 114                         }
 115                 }
 116
 117                 if (nr_events == before)
 118                         perf_evlist__poll(evlist, 10);
 119
 120                 if (++nr_polls > 5) {
 121                         pr_debug("%s: no events!\n", __func__);
 122                         goto out_delete_evlist;
 123                 }
 124         }
 125 out_ok:
 126         err = 0;
 127 out_delete_evlist:
 128         perf_evlist__delete(evlist);
 129 out:
 130         return err;
 131 }