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 }
141