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