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

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