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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 | ||
7 | #include <perf.h> | |
8 | #include <evlist.h> | |
9 | #include <sys/prctl.h> | |
10 | #include "tests.h" | |
11 | #include "debug.h" | |
a43783ae | 12 | #include <errno.h> |
ee74701e WN |
13 | |
14 | #define NR_ITERS 111 | |
15 | ||
16 | static void testcase(void) | |
17 | { | |
18 | int i; | |
19 | ||
20 | for (i = 0; i < NR_ITERS; i++) { | |
11c1ea6f | 21 | char proc_name[15]; |
ee74701e WN |
22 | |
23 | snprintf(proc_name, sizeof(proc_name), "p:%d\n", i); | |
24 | prctl(PR_SET_NAME, proc_name); | |
25 | } | |
26 | } | |
27 | ||
28 | static int count_samples(struct perf_evlist *evlist, int *sample_count, | |
29 | int *comm_count) | |
30 | { | |
31 | int i; | |
32 | ||
33 | for (i = 0; i < evlist->nr_mmaps; i++) { | |
600a7cfe | 34 | struct perf_mmap *map = &evlist->overwrite_mmap[i]; |
ee74701e WN |
35 | union perf_event *event; |
36 | ||
b9bae2c8 | 37 | perf_mmap__read_init(map); |
0019dc87 | 38 | while ((event = perf_mmap__read_event(map)) != NULL) { |
ee74701e WN |
39 | const u32 type = event->header.type; |
40 | ||
41 | switch (type) { | |
42 | case PERF_RECORD_SAMPLE: | |
43 | (*sample_count)++; | |
44 | break; | |
45 | case PERF_RECORD_COMM: | |
46 | (*comm_count)++; | |
47 | break; | |
48 | default: | |
49 | pr_err("Unexpected record of type %d\n", type); | |
50 | return TEST_FAIL; | |
51 | } | |
52 | } | |
600a7cfe | 53 | perf_mmap__read_done(map); |
ee74701e WN |
54 | } |
55 | return TEST_OK; | |
56 | } | |
57 | ||
58 | static int do_test(struct perf_evlist *evlist, int mmap_pages, | |
59 | int *sample_count, int *comm_count) | |
60 | { | |
61 | int err; | |
62 | char sbuf[STRERR_BUFSIZE]; | |
63 | ||
f74b9d3a | 64 | err = perf_evlist__mmap(evlist, mmap_pages); |
ee74701e WN |
65 | if (err < 0) { |
66 | pr_debug("perf_evlist__mmap: %s\n", | |
c8b5f2c9 | 67 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
68 | return TEST_FAIL; |
69 | } | |
70 | ||
71 | perf_evlist__enable(evlist); | |
72 | testcase(); | |
73 | perf_evlist__disable(evlist); | |
74 | ||
75 | err = count_samples(evlist, sample_count, comm_count); | |
76 | perf_evlist__munmap(evlist); | |
77 | return err; | |
78 | } | |
79 | ||
80 | ||
81f17c90 | 81 | int test__backward_ring_buffer(struct test *test __maybe_unused, int subtest __maybe_unused) |
ee74701e WN |
82 | { |
83 | int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0; | |
84 | char pid[16], sbuf[STRERR_BUFSIZE]; | |
85 | struct perf_evlist *evlist; | |
86 | struct perf_evsel *evsel __maybe_unused; | |
87 | struct parse_events_error parse_error; | |
88 | struct record_opts opts = { | |
89 | .target = { | |
90 | .uid = UINT_MAX, | |
91 | .uses_mmap = true, | |
92 | }, | |
93 | .freq = 0, | |
94 | .mmap_pages = 256, | |
95 | .default_interval = 1, | |
96 | }; | |
97 | ||
98 | snprintf(pid, sizeof(pid), "%d", getpid()); | |
99 | pid[sizeof(pid) - 1] = '\0'; | |
100 | opts.target.tid = opts.target.pid = pid; | |
101 | ||
102 | evlist = perf_evlist__new(); | |
103 | if (!evlist) { | |
042cfb5f | 104 | pr_debug("Not enough memory to create evlist\n"); |
ee74701e WN |
105 | return TEST_FAIL; |
106 | } | |
107 | ||
108 | err = perf_evlist__create_maps(evlist, &opts.target); | |
109 | if (err < 0) { | |
110 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
111 | goto out_delete_evlist; | |
112 | } | |
113 | ||
114 | bzero(&parse_error, sizeof(parse_error)); | |
626a6b78 WN |
115 | /* |
116 | * Set backward bit, ring buffer should be writing from end. Record | |
117 | * it in aux evlist | |
118 | */ | |
119 | err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error); | |
ee74701e WN |
120 | if (err) { |
121 | pr_debug("Failed to parse tracepoint event, try use root\n"); | |
122 | ret = TEST_SKIP; | |
123 | goto out_delete_evlist; | |
124 | } | |
125 | ||
126 | perf_evlist__config(evlist, &opts, NULL); | |
127 | ||
ee74701e WN |
128 | err = perf_evlist__open(evlist); |
129 | if (err < 0) { | |
130 | pr_debug("perf_evlist__open: %s\n", | |
c8b5f2c9 | 131 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
132 | goto out_delete_evlist; |
133 | } | |
134 | ||
135 | ret = TEST_FAIL; | |
136 | err = do_test(evlist, opts.mmap_pages, &sample_count, | |
137 | &comm_count); | |
138 | if (err != TEST_OK) | |
139 | goto out_delete_evlist; | |
140 | ||
141 | if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) { | |
142 | pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n", | |
143 | sample_count, comm_count); | |
144 | goto out_delete_evlist; | |
145 | } | |
146 | ||
147 | err = do_test(evlist, 1, &sample_count, &comm_count); | |
148 | if (err != TEST_OK) | |
149 | goto out_delete_evlist; | |
150 | ||
151 | ret = TEST_OK; | |
152 | out_delete_evlist: | |
153 | perf_evlist__delete(evlist); | |
154 | return ret; | |
155 | } |