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 ret = TEST_FAIL, err, 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                 ret = PTR_ERR(evsel) == -EACCES ? TEST_SKIP : TEST_FAIL;
  55                 goto out_delete_evlist;
  56         }
  57
  58         evlist__add(evlist, evsel);
  59
  60         err = evlist__create_maps(evlist, &opts.target);
  61         if (err < 0) {
  62                 pr_debug("%s: evlist__create_maps\n", __func__);
  63                 goto out_delete_evlist;
  64         }
  65
  66         evsel__config(evsel, &opts, NULL);
  67
  68         perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
  69
  70         err = evlist__open(evlist);
  71         if (err < 0) {
  72                 pr_debug("perf_evlist__open: %s\n",
  73                          str_error_r(errno, sbuf, sizeof(sbuf)));
  74                 goto out_delete_evlist;
  75         }
  76
  77         err = evlist__mmap(evlist, UINT_MAX);
  78         if (err < 0) {
  79                 pr_debug("evlist__mmap: %s\n",
  80                          str_error_r(errno, sbuf, sizeof(sbuf)));
  81                 goto out_delete_evlist;
  82         }
  83
  84         evlist__enable(evlist);
  85
  86         /*
  87          * Generate the event:
  88          */
  89         openat(AT_FDCWD, filename, flags);
  90
  91         while (1) {
  92                 int before = nr_events;
  93
  94                 for (i = 0; i < evlist->core.nr_mmaps; i++) {
  95                         union perf_event *event;
  96                         struct mmap *md;
  97
  98                         md = &evlist->mmap[i];
  99                         if (perf_mmap__read_init(&md->core) < 0)
 100                                 continue;
 101
 102                         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 103                                 const u32 type = event->header.type;
 104                                 int tp_flags;
 105                                 struct perf_sample sample;
 106
 107                                 ++nr_events;
 108
 109                                 if (type != PERF_RECORD_SAMPLE) {
 110                                         perf_mmap__consume(&md->core);
 111                                         continue;
 112                                 }
 113
 114                                 err = evsel__parse_sample(evsel, event, &sample);
 115                                 if (err) {
 116                                         pr_debug("Can't parse sample, err = %d\n", err);
 117                                         goto out_delete_evlist;
 118                                 }
 119
 120                                 tp_flags = evsel__intval(evsel, &sample, "flags");
 121
 122                                 if (flags != tp_flags) {
 123                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 124                                                  __func__, flags, tp_flags);
 125                                         goto out_delete_evlist;
 126                                 }
 127
 128                                 goto out_ok;
 129                         }
 130                         perf_mmap__read_done(&md->core);
 131                 }
 132
 133                 if (nr_events == before)
 134                         evlist__poll(evlist, 10);
 135
 136                 if (++nr_polls > 5) {
 137                         pr_debug("%s: no events!\n", __func__);
 138                         goto out_delete_evlist;
 139                 }
 140         }
 141 out_ok:
 142         ret = TEST_OK;
 143 out_delete_evlist:
 144         evlist__delete(evlist);
 145 out:
 146         return ret;
 147 }
 148
 149 static struct test_case tests__syscall_openat_tp_fields[] = {
 150         TEST_CASE_REASON("syscalls:sys_enter_openat event fields",
 151                          syscall_openat_tp_fields,
 152                          "permissions"),
 153         {       .name = NULL, }
 154 };
 155
 156 struct test_suite suite__syscall_openat_tp_fields = {
 157         .desc = "syscalls:sys_enter_openat event fields",
 158         .test_cases = tests__syscall_openat_tp_fields,
 159 };