1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
2ee74701eSWang Nan /*
3ee74701eSWang Nan * Test backward bit in event attribute, read ring buffer from end to
4ee74701eSWang Nan * beginning
5ee74701eSWang Nan */
6ee74701eSWang Nan
7ee74701eSWang Nan #include <evlist.h>
8ee74701eSWang Nan #include <sys/prctl.h>
9aeb00b1aSArnaldo Carvalho de Melo #include "record.h"
10ee74701eSWang Nan #include "tests.h"
11ee74701eSWang Nan #include "debug.h"
12f2a39fe8SArnaldo Carvalho de Melo #include "parse-events.h"
13e0fcfb08SArnaldo Carvalho de Melo #include "util/mmap.h"
14a43783aeSArnaldo Carvalho de Melo #include <errno.h>
158520a98dSArnaldo Carvalho de Melo #include <linux/string.h>
167728fa0cSJiri Olsa #include <perf/mmap.h>
17ee74701eSWang Nan
18ee74701eSWang Nan #define NR_ITERS 111
19ee74701eSWang Nan
testcase(void)20ee74701eSWang Nan static void testcase(void)
21ee74701eSWang Nan {
22ee74701eSWang Nan int i;
23ee74701eSWang Nan
24ee74701eSWang Nan for (i = 0; i < NR_ITERS; i++) {
2511c1ea6fSChangbin Du char proc_name[15];
26ee74701eSWang Nan
27ee74701eSWang Nan snprintf(proc_name, sizeof(proc_name), "p:%d\n", i);
28ee74701eSWang Nan prctl(PR_SET_NAME, proc_name);
29ee74701eSWang Nan }
30ee74701eSWang Nan }
31ee74701eSWang Nan
count_samples(struct evlist * evlist,int * sample_count,int * comm_count)3263503dbaSJiri Olsa static int count_samples(struct evlist *evlist, int *sample_count,
33ee74701eSWang Nan int *comm_count)
34ee74701eSWang Nan {
35ee74701eSWang Nan int i;
36ee74701eSWang Nan
37c976ee11SJiri Olsa for (i = 0; i < evlist->core.nr_mmaps; i++) {
38a5830532SJiri Olsa struct mmap *map = &evlist->overwrite_mmap[i];
39ee74701eSWang Nan union perf_event *event;
40ee74701eSWang Nan
417c4d4182SJiri Olsa perf_mmap__read_init(&map->core);
42151ed5d7SJiri Olsa while ((event = perf_mmap__read_event(&map->core)) != NULL) {
43ee74701eSWang Nan const u32 type = event->header.type;
44ee74701eSWang Nan
45ee74701eSWang Nan switch (type) {
46ee74701eSWang Nan case PERF_RECORD_SAMPLE:
47ee74701eSWang Nan (*sample_count)++;
48ee74701eSWang Nan break;
49ee74701eSWang Nan case PERF_RECORD_COMM:
50ee74701eSWang Nan (*comm_count)++;
51ee74701eSWang Nan break;
52ee74701eSWang Nan default:
53ee74701eSWang Nan pr_err("Unexpected record of type %d\n", type);
54ee74701eSWang Nan return TEST_FAIL;
55ee74701eSWang Nan }
56ee74701eSWang Nan }
5732fdc2caSJiri Olsa perf_mmap__read_done(&map->core);
58ee74701eSWang Nan }
59ee74701eSWang Nan return TEST_OK;
60ee74701eSWang Nan }
61ee74701eSWang Nan
do_test(struct evlist * evlist,int mmap_pages,int * sample_count,int * comm_count)6263503dbaSJiri Olsa static int do_test(struct evlist *evlist, int mmap_pages,
63ee74701eSWang Nan int *sample_count, int *comm_count)
64ee74701eSWang Nan {
65ee74701eSWang Nan int err;
66ee74701eSWang Nan char sbuf[STRERR_BUFSIZE];
67ee74701eSWang Nan
689521b5f2SJiri Olsa err = evlist__mmap(evlist, mmap_pages);
69ee74701eSWang Nan if (err < 0) {
709521b5f2SJiri Olsa pr_debug("evlist__mmap: %s\n",
71c8b5f2c9SArnaldo Carvalho de Melo str_error_r(errno, sbuf, sizeof(sbuf)));
72ee74701eSWang Nan return TEST_FAIL;
73ee74701eSWang Nan }
74ee74701eSWang Nan
751c87f165SJiri Olsa evlist__enable(evlist);
76ee74701eSWang Nan testcase();
77e74676deSJiri Olsa evlist__disable(evlist);
78ee74701eSWang Nan
79ee74701eSWang Nan err = count_samples(evlist, sample_count, comm_count);
80db6b7b13SJiri Olsa evlist__munmap(evlist);
81ee74701eSWang Nan return err;
82ee74701eSWang Nan }
83ee74701eSWang Nan
84ee74701eSWang Nan
test__backward_ring_buffer(struct test_suite * test __maybe_unused,int subtest __maybe_unused)85*33f44bfdSIan Rogers static int test__backward_ring_buffer(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
86ee74701eSWang Nan {
87ee74701eSWang Nan int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
88ee74701eSWang Nan char pid[16], sbuf[STRERR_BUFSIZE];
8963503dbaSJiri Olsa struct evlist *evlist;
9032dcd021SJiri Olsa struct evsel *evsel __maybe_unused;
91ee74701eSWang Nan struct parse_events_error parse_error;
92ee74701eSWang Nan struct record_opts opts = {
93ee74701eSWang Nan .target = {
94ee74701eSWang Nan .uid = UINT_MAX,
95ee74701eSWang Nan .uses_mmap = true,
96ee74701eSWang Nan },
97ee74701eSWang Nan .freq = 0,
98ee74701eSWang Nan .mmap_pages = 256,
99ee74701eSWang Nan .default_interval = 1,
100ee74701eSWang Nan };
101ee74701eSWang Nan
102ee74701eSWang Nan snprintf(pid, sizeof(pid), "%d", getpid());
103ee74701eSWang Nan pid[sizeof(pid) - 1] = '\0';
104ee74701eSWang Nan opts.target.tid = opts.target.pid = pid;
105ee74701eSWang Nan
1060f98b11cSJiri Olsa evlist = evlist__new();
107ee74701eSWang Nan if (!evlist) {
108042cfb5fSAlexander Alemayhu pr_debug("Not enough memory to create evlist\n");
109ee74701eSWang Nan return TEST_FAIL;
110ee74701eSWang Nan }
111ee74701eSWang Nan
1127748bb71SArnaldo Carvalho de Melo err = evlist__create_maps(evlist, &opts.target);
113ee74701eSWang Nan if (err < 0) {
114ee74701eSWang Nan pr_debug("Not enough memory to create thread/cpu maps\n");
115ee74701eSWang Nan goto out_delete_evlist;
116ee74701eSWang Nan }
117ee74701eSWang Nan
11807eafd4eSIan Rogers parse_events_error__init(&parse_error);
119626a6b78SWang Nan /*
120626a6b78SWang Nan * Set backward bit, ring buffer should be writing from end. Record
121626a6b78SWang Nan * it in aux evlist
122626a6b78SWang Nan */
123626a6b78SWang Nan err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);
12407eafd4eSIan Rogers parse_events_error__exit(&parse_error);
125ee74701eSWang Nan if (err) {
126ee74701eSWang Nan pr_debug("Failed to parse tracepoint event, try use root\n");
127ee74701eSWang Nan ret = TEST_SKIP;
128ee74701eSWang Nan goto out_delete_evlist;
129ee74701eSWang Nan }
130ee74701eSWang Nan
13178e1bc25SArnaldo Carvalho de Melo evlist__config(evlist, &opts, NULL);
132ee74701eSWang Nan
133474ddc4cSJiri Olsa err = evlist__open(evlist);
134ee74701eSWang Nan if (err < 0) {
135ee74701eSWang Nan pr_debug("perf_evlist__open: %s\n",
136c8b5f2c9SArnaldo Carvalho de Melo str_error_r(errno, sbuf, sizeof(sbuf)));
137ee74701eSWang Nan goto out_delete_evlist;
138ee74701eSWang Nan }
139ee74701eSWang Nan
140ee74701eSWang Nan ret = TEST_FAIL;
141ee74701eSWang Nan err = do_test(evlist, opts.mmap_pages, &sample_count,
142ee74701eSWang Nan &comm_count);
143ee74701eSWang Nan if (err != TEST_OK)
144ee74701eSWang Nan goto out_delete_evlist;
145ee74701eSWang Nan
146ee74701eSWang Nan if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
147ee74701eSWang Nan pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
148ee74701eSWang Nan sample_count, comm_count);
149ee74701eSWang Nan goto out_delete_evlist;
150ee74701eSWang Nan }
151ee74701eSWang Nan
152af8490ebSLeo Yan evlist__close(evlist);
153af8490ebSLeo Yan
154af8490ebSLeo Yan err = evlist__open(evlist);
155af8490ebSLeo Yan if (err < 0) {
156af8490ebSLeo Yan pr_debug("perf_evlist__open: %s\n",
157af8490ebSLeo Yan str_error_r(errno, sbuf, sizeof(sbuf)));
158af8490ebSLeo Yan goto out_delete_evlist;
159af8490ebSLeo Yan }
160af8490ebSLeo Yan
161ee74701eSWang Nan err = do_test(evlist, 1, &sample_count, &comm_count);
162ee74701eSWang Nan if (err != TEST_OK)
163ee74701eSWang Nan goto out_delete_evlist;
164ee74701eSWang Nan
165ee74701eSWang Nan ret = TEST_OK;
166ee74701eSWang Nan out_delete_evlist:
167c12995a5SJiri Olsa evlist__delete(evlist);
168ee74701eSWang Nan return ret;
169ee74701eSWang Nan }
170d68f0365SIan Rogers
171d68f0365SIan Rogers DEFINE_SUITE("Read backward ring buffer", backward_ring_buffer);
172