1 // SPDX-License-Identifier: GPL-2.0
5 #include <perf/cpumap.h>
11 #include "thread_map.h"
13 #include "util/mmap.h"
14 #include "util/sample.h"
15 #include <linux/err.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <perf/evlist.h>
19 #include <perf/mmap.h>
22 * This test will generate random numbers of calls to some getpid syscalls,
23 * then establish an mmap for a group of events that are created to monitor
26 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
27 * sample.id field to map back to its respective perf_evsel instance.
29 * Then it checks if the number of syscalls reported as perf events by
30 * the kernel corresponds to the number of syscalls made.
32 static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
35 union perf_event *event;
36 struct perf_thread_map *threads;
37 struct perf_cpu_map *cpus;
38 struct evlist *evlist;
40 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
41 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
42 #define nsyscalls ARRAY_SIZE(syscall_names)
43 unsigned int nr_events[nsyscalls],
44 expected_nr_events[nsyscalls], i, j;
45 struct evsel *evsels[nsyscalls], *evsel;
46 char sbuf[STRERR_BUFSIZE];
49 threads = thread_map__new(-1, getpid(), UINT_MAX);
50 if (threads == NULL) {
51 pr_debug("thread_map__new\n");
55 cpus = perf_cpu_map__new_online_cpus();
57 pr_debug("perf_cpu_map__new\n");
58 goto out_free_threads;
62 CPU_SET(perf_cpu_map__cpu(cpus, 0).cpu, &cpu_set);
63 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
64 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
65 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
66 perf_cpu_map__cpu(cpus, 0).cpu,
67 str_error_r(errno, sbuf, sizeof(sbuf)));
71 evlist = evlist__new();
73 pr_debug("evlist__new\n");
77 perf_evlist__set_maps(&evlist->core, cpus, threads);
79 for (i = 0; i < nsyscalls; ++i) {
82 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
83 evsels[i] = evsel__newtp("syscalls", name);
84 if (IS_ERR(evsels[i])) {
85 pr_debug("evsel__new(%s)\n", name);
86 if (PTR_ERR(evsels[i]) == -EACCES) {
87 /* Permissions failure, flag the failure as a skip. */
90 goto out_delete_evlist;
93 evsels[i]->core.attr.wakeup_events = 1;
94 evsel__set_sample_id(evsels[i], false);
96 evlist__add(evlist, evsels[i]);
98 if (evsel__open(evsels[i], cpus, threads) < 0) {
99 pr_debug("failed to open counter: %s, "
100 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
101 str_error_r(errno, sbuf, sizeof(sbuf)));
102 goto out_delete_evlist;
106 expected_nr_events[i] = 1 + rand() % 127;
109 if (evlist__mmap(evlist, 128) < 0) {
110 pr_debug("failed to mmap events: %d (%s)\n", errno,
111 str_error_r(errno, sbuf, sizeof(sbuf)));
112 goto out_delete_evlist;
115 for (i = 0; i < nsyscalls; ++i)
116 for (j = 0; j < expected_nr_events[i]; ++j) {
120 md = &evlist->mmap[0];
121 if (perf_mmap__read_init(&md->core) < 0)
124 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
125 struct perf_sample sample;
127 if (event->header.type != PERF_RECORD_SAMPLE) {
128 pr_debug("unexpected %s event\n",
129 perf_event__name(event->header.type));
130 goto out_delete_evlist;
133 err = evlist__parse_sample(evlist, event, &sample);
135 pr_err("Can't parse sample, err = %d\n", err);
136 goto out_delete_evlist;
140 evsel = evlist__id2evsel(evlist, sample.id);
142 pr_debug("event with id %" PRIu64
143 " doesn't map to an evsel\n", sample.id);
144 goto out_delete_evlist;
146 nr_events[evsel->core.idx]++;
147 perf_mmap__consume(&md->core);
149 perf_mmap__read_done(&md->core);
153 evlist__for_each_entry(evlist, evsel) {
154 if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) {
155 pr_debug("expected %d %s events, got %d\n",
156 expected_nr_events[evsel->core.idx],
157 evsel__name(evsel), nr_events[evsel->core.idx]);
159 goto out_delete_evlist;
164 evlist__delete(evlist);
166 perf_cpu_map__put(cpus);
168 perf_thread_map__put(threads);
172 static int test_stat_user_read(int event)
174 struct perf_counts_values counts = { .val = 0 };
175 struct perf_thread_map *threads;
176 struct perf_evsel *evsel;
177 struct perf_event_mmap_page *pc;
178 struct perf_event_attr attr = {
179 .type = PERF_TYPE_HARDWARE,
182 .config1 = 0x2, /* Request user access */
185 int err, i, ret = TEST_FAIL;
186 bool opened = false, mapped = false;
188 threads = perf_thread_map__new_dummy();
189 TEST_ASSERT_VAL("failed to create threads", threads);
191 perf_thread_map__set_pid(threads, 0, 0);
193 evsel = perf_evsel__new(&attr);
194 TEST_ASSERT_VAL("failed to create evsel", evsel);
196 err = perf_evsel__open(evsel, NULL, threads);
198 pr_err("failed to open evsel: %s\n", strerror(-err));
204 err = perf_evsel__mmap(evsel, 0);
206 pr_err("failed to mmap evsel: %s\n", strerror(-err));
211 pc = perf_evsel__mmap_base(evsel, 0, 0);
213 pr_err("failed to get mmapped address\n");
217 if (!pc->cap_user_rdpmc || !pc->index) {
218 pr_err("userspace counter access not %s\n",
219 !pc->cap_user_rdpmc ? "supported" : "enabled");
223 if (pc->pmc_width < 32) {
224 pr_err("userspace counter width not set (%d)\n", pc->pmc_width);
228 perf_evsel__read(evsel, 0, 0, &counts);
229 if (counts.val == 0) {
230 pr_err("failed to read value for evsel\n");
234 for (i = 0; i < 5; i++) {
235 volatile int count = 0x10000 << i;
236 __u64 start, end, last = 0;
238 pr_debug("\tloop = %u, ", count);
240 perf_evsel__read(evsel, 0, 0, &counts);
245 perf_evsel__read(evsel, 0, 0, &counts);
248 if ((end - start) < last) {
249 pr_err("invalid counter data: end=%llu start=%llu last= %llu\n",
254 pr_debug("count = %llu\n", end - start);
260 perf_evsel__munmap(evsel);
262 perf_evsel__close(evsel);
263 perf_evsel__delete(evsel);
265 perf_thread_map__put(threads);
269 static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused,
270 int subtest __maybe_unused)
272 return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
275 static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused,
276 int subtest __maybe_unused)
278 return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
281 static struct test_case tests__basic_mmap[] = {
282 TEST_CASE_REASON("Read samples using the mmap interface",
285 TEST_CASE_REASON("User space counter reading of instructions",
286 mmap_user_read_instr,
287 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
288 (defined(__riscv) && __riscv_xlen == 64)
294 TEST_CASE_REASON("User space counter reading of cycles",
295 mmap_user_read_cycles,
296 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
297 (defined(__riscv) && __riscv_xlen == 64)
306 struct test_suite suite__basic_mmap = {
307 .desc = "mmap interface tests",
308 .test_cases = tests__basic_mmap,