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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdbool.h>
   3 #include <linux/err.h>
   4 #include <linux/string.h>
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include "evlist.h"
   9 #include "evsel.h"
  10 #include "thread_map.h"
  11 #include "record.h"
  12 #include "tests.h"
  13 #include "debug.h"
  14 #include "util/mmap.h"
  15 #include <errno.h>
  16 #include <perf/mmap.h>
  17 #include "util/sample.h"
  18
  19 #ifndef O_DIRECTORY
  20 #define O_DIRECTORY    00200000
  21 #endif
  22 #ifndef AT_FDCWD
  23 #define AT_FDCWD       -100
  24 #endif
  25
  26 static int test__syscall_openat_tp_fields(struct test_suite *test __maybe_unused,
  27                                           int subtest __maybe_unused)
  28 {
  29         struct record_opts opts = {
  30                 .target = {
  31                         .uid = UINT_MAX,
  32                         .uses_mmap = true,
  33                 },
  34                 .no_buffering = true,
  35                 .freq         = 1,
  36                 .mmap_pages   = 256,
  37                 .raw_samples  = true,
  38         };
  39         const char *filename = "/etc/passwd";
  40         int flags = O_RDONLY | O_DIRECTORY;
  41         struct evlist *evlist = evlist__new();
  42         struct evsel *evsel;
  43         int err = -1, i, nr_events = 0, nr_polls = 0;
  44         char sbuf[STRERR_BUFSIZE];
  45
  46         if (evlist == NULL) {
  47                 pr_debug("%s: evlist__new\n", __func__);
  48                 goto out;
  49         }
  50
  51         evsel = evsel__newtp("syscalls", "sys_enter_openat");
  52         if (IS_ERR(evsel)) {
  53                 pr_debug("%s: evsel__newtp\n", __func__);
  54                 goto out_delete_evlist;
  55         }
  56
  57         evlist__add(evlist, evsel);
  58
  59         err = evlist__create_maps(evlist, &opts.target);
  60         if (err < 0) {
  61                 pr_debug("%s: evlist__create_maps\n", __func__);
  62                 goto out_delete_evlist;
  63         }
  64
  65         evsel__config(evsel, &opts, NULL);
  66
  67         perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
  68
  69         err = evlist__open(evlist);
  70         if (err < 0) {
  71                 pr_debug("perf_evlist__open: %s\n",
  72                          str_error_r(errno, sbuf, sizeof(sbuf)));
  73                 goto out_delete_evlist;
  74         }
  75
  76         err = evlist__mmap(evlist, UINT_MAX);
  77         if (err < 0) {
  78                 pr_debug("evlist__mmap: %s\n",
  79                          str_error_r(errno, sbuf, sizeof(sbuf)));
  80                 goto out_delete_evlist;
  81         }
  82
  83         evlist__enable(evlist);
  84
  85         /*
  86          * Generate the event:
  87          */
  88         openat(AT_FDCWD, filename, flags);
  89
  90         while (1) {
  91                 int before = nr_events;
  92
  93                 for (i = 0; i < evlist->core.nr_mmaps; i++) {
  94                         union perf_event *event;
  95                         struct mmap *md;
  96
  97                         md = &evlist->mmap[i];
  98                         if (perf_mmap__read_init(&md->core) < 0)
  99                                 continue;
 100
 101                         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 102                                 const u32 type = event->header.type;
 103                                 int tp_flags;
 104                                 struct perf_sample sample;
 105
 106                                 ++nr_events;
 107
 108                                 if (type != PERF_RECORD_SAMPLE) {
 109                                         perf_mmap__consume(&md->core);
 110                                         continue;
 111                                 }
 112
 113                                 err = evsel__parse_sample(evsel, event, &sample);
 114                                 if (err) {
 115                                         pr_debug("Can't parse sample, err = %d\n", err);
 116                                         goto out_delete_evlist;
 117                                 }
 118
 119                                 tp_flags = evsel__intval(evsel, &sample, "flags");
 120
 121                                 if (flags != tp_flags) {
 122                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 123                                                  __func__, flags, tp_flags);
 124                                         goto out_delete_evlist;
 125                                 }
 126
 127                                 goto out_ok;
 128                         }
 129                         perf_mmap__read_done(&md->core);
 130                 }
 131
 132                 if (nr_events == before)
 133                         evlist__poll(evlist, 10);
 134
 135                 if (++nr_polls > 5) {
 136                         pr_debug("%s: no events!\n", __func__);
 137                         goto out_delete_evlist;
 138                 }
 139         }
 140 out_ok:
 141         err = 0;
 142 out_delete_evlist:
 143         evlist__delete(evlist);
 144 out:
 145         return err;
 146 }
 147
 148 DEFINE_SUITE("syscalls:sys_enter_openat event fields", syscall_openat_tp_fields);