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