tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
25static 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 }
139out_ok:
140 err = 0;
141out_delete_evlist:
142 evlist__delete(evlist);
143out:
144 return err;
145}
146
147DEFINE_SUITE("syscalls:sys_enter_openat event fields", syscall_openat_tp_fields);