Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ee74701e WN |
2 | /* |
3 | * Test backward bit in event attribute, read ring buffer from end to | |
4 | * beginning | |
5 | */ | |
6 | ||
ee74701e WN |
7 | #include <evlist.h> |
8 | #include <sys/prctl.h> | |
aeb00b1a | 9 | #include "record.h" |
ee74701e WN |
10 | #include "tests.h" |
11 | #include "debug.h" | |
f2a39fe8 | 12 | #include "parse-events.h" |
e0fcfb08 | 13 | #include "util/mmap.h" |
a43783ae | 14 | #include <errno.h> |
8520a98d | 15 | #include <linux/string.h> |
7728fa0c | 16 | #include <perf/mmap.h> |
ee74701e WN |
17 | |
18 | #define NR_ITERS 111 | |
19 | ||
20 | static void testcase(void) | |
21 | { | |
22 | int i; | |
23 | ||
24 | for (i = 0; i < NR_ITERS; i++) { | |
11c1ea6f | 25 | char proc_name[15]; |
ee74701e WN |
26 | |
27 | snprintf(proc_name, sizeof(proc_name), "p:%d\n", i); | |
28 | prctl(PR_SET_NAME, proc_name); | |
29 | } | |
30 | } | |
31 | ||
63503dba | 32 | static int count_samples(struct evlist *evlist, int *sample_count, |
ee74701e WN |
33 | int *comm_count) |
34 | { | |
35 | int i; | |
36 | ||
c976ee11 | 37 | for (i = 0; i < evlist->core.nr_mmaps; i++) { |
a5830532 | 38 | struct mmap *map = &evlist->overwrite_mmap[i]; |
ee74701e WN |
39 | union perf_event *event; |
40 | ||
7c4d4182 | 41 | perf_mmap__read_init(&map->core); |
151ed5d7 | 42 | while ((event = perf_mmap__read_event(&map->core)) != NULL) { |
ee74701e WN |
43 | const u32 type = event->header.type; |
44 | ||
45 | switch (type) { | |
46 | case PERF_RECORD_SAMPLE: | |
47 | (*sample_count)++; | |
48 | break; | |
49 | case PERF_RECORD_COMM: | |
50 | (*comm_count)++; | |
51 | break; | |
52 | default: | |
53 | pr_err("Unexpected record of type %d\n", type); | |
54 | return TEST_FAIL; | |
55 | } | |
56 | } | |
32fdc2ca | 57 | perf_mmap__read_done(&map->core); |
ee74701e WN |
58 | } |
59 | return TEST_OK; | |
60 | } | |
61 | ||
63503dba | 62 | static int do_test(struct evlist *evlist, int mmap_pages, |
ee74701e WN |
63 | int *sample_count, int *comm_count) |
64 | { | |
65 | int err; | |
66 | char sbuf[STRERR_BUFSIZE]; | |
67 | ||
9521b5f2 | 68 | err = evlist__mmap(evlist, mmap_pages); |
ee74701e | 69 | if (err < 0) { |
9521b5f2 | 70 | pr_debug("evlist__mmap: %s\n", |
c8b5f2c9 | 71 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
72 | return TEST_FAIL; |
73 | } | |
74 | ||
1c87f165 | 75 | evlist__enable(evlist); |
ee74701e | 76 | testcase(); |
e74676de | 77 | evlist__disable(evlist); |
ee74701e WN |
78 | |
79 | err = count_samples(evlist, sample_count, comm_count); | |
db6b7b13 | 80 | evlist__munmap(evlist); |
ee74701e WN |
81 | return err; |
82 | } | |
83 | ||
84 | ||
33f44bfd | 85 | static int test__backward_ring_buffer(struct test_suite *test __maybe_unused, int subtest __maybe_unused) |
ee74701e WN |
86 | { |
87 | int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0; | |
88 | char pid[16], sbuf[STRERR_BUFSIZE]; | |
63503dba | 89 | struct evlist *evlist; |
32dcd021 | 90 | struct evsel *evsel __maybe_unused; |
ee74701e WN |
91 | struct parse_events_error parse_error; |
92 | struct record_opts opts = { | |
93 | .target = { | |
94 | .uid = UINT_MAX, | |
95 | .uses_mmap = true, | |
96 | }, | |
97 | .freq = 0, | |
98 | .mmap_pages = 256, | |
99 | .default_interval = 1, | |
100 | }; | |
101 | ||
102 | snprintf(pid, sizeof(pid), "%d", getpid()); | |
103 | pid[sizeof(pid) - 1] = '\0'; | |
104 | opts.target.tid = opts.target.pid = pid; | |
105 | ||
0f98b11c | 106 | evlist = evlist__new(); |
ee74701e | 107 | if (!evlist) { |
042cfb5f | 108 | pr_debug("Not enough memory to create evlist\n"); |
ee74701e WN |
109 | return TEST_FAIL; |
110 | } | |
111 | ||
7748bb71 | 112 | err = evlist__create_maps(evlist, &opts.target); |
ee74701e WN |
113 | if (err < 0) { |
114 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
115 | goto out_delete_evlist; | |
116 | } | |
117 | ||
07eafd4e | 118 | parse_events_error__init(&parse_error); |
626a6b78 WN |
119 | /* |
120 | * Set backward bit, ring buffer should be writing from end. Record | |
121 | * it in aux evlist | |
122 | */ | |
123 | err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error); | |
07eafd4e | 124 | parse_events_error__exit(&parse_error); |
ee74701e WN |
125 | if (err) { |
126 | pr_debug("Failed to parse tracepoint event, try use root\n"); | |
127 | ret = TEST_SKIP; | |
128 | goto out_delete_evlist; | |
129 | } | |
130 | ||
78e1bc25 | 131 | evlist__config(evlist, &opts, NULL); |
ee74701e | 132 | |
474ddc4c | 133 | err = evlist__open(evlist); |
ee74701e WN |
134 | if (err < 0) { |
135 | pr_debug("perf_evlist__open: %s\n", | |
c8b5f2c9 | 136 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
137 | goto out_delete_evlist; |
138 | } | |
139 | ||
140 | ret = TEST_FAIL; | |
141 | err = do_test(evlist, opts.mmap_pages, &sample_count, | |
142 | &comm_count); | |
143 | if (err != TEST_OK) | |
144 | goto out_delete_evlist; | |
145 | ||
146 | if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) { | |
147 | pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n", | |
148 | sample_count, comm_count); | |
149 | goto out_delete_evlist; | |
150 | } | |
151 | ||
af8490eb LY |
152 | evlist__close(evlist); |
153 | ||
154 | err = evlist__open(evlist); | |
155 | if (err < 0) { | |
156 | pr_debug("perf_evlist__open: %s\n", | |
157 | str_error_r(errno, sbuf, sizeof(sbuf))); | |
158 | goto out_delete_evlist; | |
159 | } | |
160 | ||
ee74701e WN |
161 | err = do_test(evlist, 1, &sample_count, &comm_count); |
162 | if (err != TEST_OK) | |
163 | goto out_delete_evlist; | |
164 | ||
165 | ret = TEST_OK; | |
166 | out_delete_evlist: | |
c12995a5 | 167 | evlist__delete(evlist); |
ee74701e WN |
168 | return ret; |
169 | } | |
d68f0365 IR |
170 | |
171 | DEFINE_SUITE("Read backward ring buffer", backward_ring_buffer); |