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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++) { | |
21 | char proc_name[10]; | |
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++) { | |
34 | union perf_event *event; | |
35 | ||
078c3386 WN |
36 | perf_mmap__read_catchup(&evlist->backward_mmap[i]); |
37 | while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != NULL) { | |
ee74701e WN |
38 | const u32 type = event->header.type; |
39 | ||
40 | switch (type) { | |
41 | case PERF_RECORD_SAMPLE: | |
42 | (*sample_count)++; | |
43 | break; | |
44 | case PERF_RECORD_COMM: | |
45 | (*comm_count)++; | |
46 | break; | |
47 | default: | |
48 | pr_err("Unexpected record of type %d\n", type); | |
49 | return TEST_FAIL; | |
50 | } | |
51 | } | |
52 | } | |
53 | return TEST_OK; | |
54 | } | |
55 | ||
56 | static int do_test(struct perf_evlist *evlist, int mmap_pages, | |
57 | int *sample_count, int *comm_count) | |
58 | { | |
59 | int err; | |
60 | char sbuf[STRERR_BUFSIZE]; | |
61 | ||
62 | err = perf_evlist__mmap(evlist, mmap_pages, true); | |
63 | if (err < 0) { | |
64 | pr_debug("perf_evlist__mmap: %s\n", | |
c8b5f2c9 | 65 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
66 | return TEST_FAIL; |
67 | } | |
68 | ||
69 | perf_evlist__enable(evlist); | |
70 | testcase(); | |
71 | perf_evlist__disable(evlist); | |
72 | ||
73 | err = count_samples(evlist, sample_count, comm_count); | |
74 | perf_evlist__munmap(evlist); | |
75 | return err; | |
76 | } | |
77 | ||
78 | ||
81f17c90 | 79 | int test__backward_ring_buffer(struct test *test __maybe_unused, int subtest __maybe_unused) |
ee74701e WN |
80 | { |
81 | int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0; | |
82 | char pid[16], sbuf[STRERR_BUFSIZE]; | |
83 | struct perf_evlist *evlist; | |
84 | struct perf_evsel *evsel __maybe_unused; | |
85 | struct parse_events_error parse_error; | |
86 | struct record_opts opts = { | |
87 | .target = { | |
88 | .uid = UINT_MAX, | |
89 | .uses_mmap = true, | |
90 | }, | |
91 | .freq = 0, | |
92 | .mmap_pages = 256, | |
93 | .default_interval = 1, | |
94 | }; | |
95 | ||
96 | snprintf(pid, sizeof(pid), "%d", getpid()); | |
97 | pid[sizeof(pid) - 1] = '\0'; | |
98 | opts.target.tid = opts.target.pid = pid; | |
99 | ||
100 | evlist = perf_evlist__new(); | |
101 | if (!evlist) { | |
042cfb5f | 102 | pr_debug("Not enough memory to create evlist\n"); |
ee74701e WN |
103 | return TEST_FAIL; |
104 | } | |
105 | ||
106 | err = perf_evlist__create_maps(evlist, &opts.target); | |
107 | if (err < 0) { | |
108 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
109 | goto out_delete_evlist; | |
110 | } | |
111 | ||
112 | bzero(&parse_error, sizeof(parse_error)); | |
626a6b78 WN |
113 | /* |
114 | * Set backward bit, ring buffer should be writing from end. Record | |
115 | * it in aux evlist | |
116 | */ | |
117 | err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error); | |
ee74701e WN |
118 | if (err) { |
119 | pr_debug("Failed to parse tracepoint event, try use root\n"); | |
120 | ret = TEST_SKIP; | |
121 | goto out_delete_evlist; | |
122 | } | |
123 | ||
124 | perf_evlist__config(evlist, &opts, NULL); | |
125 | ||
ee74701e WN |
126 | err = perf_evlist__open(evlist); |
127 | if (err < 0) { | |
128 | pr_debug("perf_evlist__open: %s\n", | |
c8b5f2c9 | 129 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ee74701e WN |
130 | goto out_delete_evlist; |
131 | } | |
132 | ||
133 | ret = TEST_FAIL; | |
134 | err = do_test(evlist, opts.mmap_pages, &sample_count, | |
135 | &comm_count); | |
136 | if (err != TEST_OK) | |
137 | goto out_delete_evlist; | |
138 | ||
139 | if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) { | |
140 | pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n", | |
141 | sample_count, comm_count); | |
142 | goto out_delete_evlist; | |
143 | } | |
144 | ||
145 | err = do_test(evlist, 1, &sample_count, &comm_count); | |
146 | if (err != TEST_OK) | |
147 | goto out_delete_evlist; | |
148 | ||
149 | ret = TEST_OK; | |
150 | out_delete_evlist: | |
151 | perf_evlist__delete(evlist); | |
152 | return ret; | |
153 | } |