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