1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <stdlib.h> 5 #include <perf/cpumap.h> 6 7 #include "debug.h" 8 #include "evlist.h" 9 #include "evsel.h" 10 #include "thread_map.h" 11 #include "tests.h" 12 #include "util/mmap.h" 13 #include <linux/err.h> 14 #include <linux/kernel.h> 15 #include <linux/string.h> 16 #include <perf/evlist.h> 17 #include <perf/mmap.h> 18 19 /* 20 * This test will generate random numbers of calls to some getpid syscalls, 21 * then establish an mmap for a group of events that are created to monitor 22 * the syscalls. 23 * 24 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated 25 * sample.id field to map back to its respective perf_evsel instance. 26 * 27 * Then it checks if the number of syscalls reported as perf events by 28 * the kernel corresponds to the number of syscalls made. 29 */ 30 static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 31 { 32 int err = TEST_FAIL; 33 union perf_event *event; 34 struct perf_thread_map *threads; 35 struct perf_cpu_map *cpus; 36 struct evlist *evlist; 37 cpu_set_t cpu_set; 38 const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; 39 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; 40 #define nsyscalls ARRAY_SIZE(syscall_names) 41 unsigned int nr_events[nsyscalls], 42 expected_nr_events[nsyscalls], i, j; 43 struct evsel *evsels[nsyscalls], *evsel; 44 char sbuf[STRERR_BUFSIZE]; 45 struct mmap *md; 46 47 threads = thread_map__new(-1, getpid(), UINT_MAX); 48 if (threads == NULL) { 49 pr_debug("thread_map__new\n"); 50 return -1; 51 } 52 53 cpus = perf_cpu_map__new(NULL); 54 if (cpus == NULL) { 55 pr_debug("perf_cpu_map__new\n"); 56 goto out_free_threads; 57 } 58 59 CPU_ZERO(&cpu_set); 60 CPU_SET(perf_cpu_map__cpu(cpus, 0).cpu, &cpu_set); 61 sched_setaffinity(0, sizeof(cpu_set), &cpu_set); 62 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 63 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 64 perf_cpu_map__cpu(cpus, 0).cpu, 65 str_error_r(errno, sbuf, sizeof(sbuf))); 66 goto out_free_cpus; 67 } 68 69 evlist = evlist__new(); 70 if (evlist == NULL) { 71 pr_debug("evlist__new\n"); 72 goto out_free_cpus; 73 } 74 75 perf_evlist__set_maps(&evlist->core, cpus, threads); 76 77 for (i = 0; i < nsyscalls; ++i) { 78 char name[64]; 79 80 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); 81 evsels[i] = evsel__newtp("syscalls", name); 82 if (IS_ERR(evsels[i])) { 83 pr_debug("evsel__new(%s)\n", name); 84 if (PTR_ERR(evsels[i]) == -EACCES) { 85 /* Permissions failure, flag the failure as a skip. */ 86 err = TEST_SKIP; 87 } 88 goto out_delete_evlist; 89 } 90 91 evsels[i]->core.attr.wakeup_events = 1; 92 evsel__set_sample_id(evsels[i], false); 93 94 evlist__add(evlist, evsels[i]); 95 96 if (evsel__open(evsels[i], cpus, threads) < 0) { 97 pr_debug("failed to open counter: %s, " 98 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 99 str_error_r(errno, sbuf, sizeof(sbuf))); 100 goto out_delete_evlist; 101 } 102 103 nr_events[i] = 0; 104 expected_nr_events[i] = 1 + rand() % 127; 105 } 106 107 if (evlist__mmap(evlist, 128) < 0) { 108 pr_debug("failed to mmap events: %d (%s)\n", errno, 109 str_error_r(errno, sbuf, sizeof(sbuf))); 110 goto out_delete_evlist; 111 } 112 113 for (i = 0; i < nsyscalls; ++i) 114 for (j = 0; j < expected_nr_events[i]; ++j) { 115 syscalls[i](); 116 } 117 118 md = &evlist->mmap[0]; 119 if (perf_mmap__read_init(&md->core) < 0) 120 goto out_init; 121 122 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 123 struct perf_sample sample; 124 125 if (event->header.type != PERF_RECORD_SAMPLE) { 126 pr_debug("unexpected %s event\n", 127 perf_event__name(event->header.type)); 128 goto out_delete_evlist; 129 } 130 131 err = evlist__parse_sample(evlist, event, &sample); 132 if (err) { 133 pr_err("Can't parse sample, err = %d\n", err); 134 goto out_delete_evlist; 135 } 136 137 err = -1; 138 evsel = evlist__id2evsel(evlist, sample.id); 139 if (evsel == NULL) { 140 pr_debug("event with id %" PRIu64 141 " doesn't map to an evsel\n", sample.id); 142 goto out_delete_evlist; 143 } 144 nr_events[evsel->core.idx]++; 145 perf_mmap__consume(&md->core); 146 } 147 perf_mmap__read_done(&md->core); 148 149 out_init: 150 err = 0; 151 evlist__for_each_entry(evlist, evsel) { 152 if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) { 153 pr_debug("expected %d %s events, got %d\n", 154 expected_nr_events[evsel->core.idx], 155 evsel__name(evsel), nr_events[evsel->core.idx]); 156 err = -1; 157 goto out_delete_evlist; 158 } 159 } 160 161 out_delete_evlist: 162 evlist__delete(evlist); 163 out_free_cpus: 164 perf_cpu_map__put(cpus); 165 out_free_threads: 166 perf_thread_map__put(threads); 167 return err; 168 } 169 170 static int test_stat_user_read(int event) 171 { 172 struct perf_counts_values counts = { .val = 0 }; 173 struct perf_thread_map *threads; 174 struct perf_evsel *evsel; 175 struct perf_event_mmap_page *pc; 176 struct perf_event_attr attr = { 177 .type = PERF_TYPE_HARDWARE, 178 .config = event, 179 #ifdef __aarch64__ 180 .config1 = 0x2, /* Request user access */ 181 #endif 182 }; 183 int err, i, ret = TEST_FAIL; 184 bool opened = false, mapped = false; 185 186 threads = perf_thread_map__new_dummy(); 187 TEST_ASSERT_VAL("failed to create threads", threads); 188 189 perf_thread_map__set_pid(threads, 0, 0); 190 191 evsel = perf_evsel__new(&attr); 192 TEST_ASSERT_VAL("failed to create evsel", evsel); 193 194 err = perf_evsel__open(evsel, NULL, threads); 195 if (err) { 196 pr_err("failed to open evsel: %s\n", strerror(-err)); 197 ret = TEST_SKIP; 198 goto out; 199 } 200 opened = true; 201 202 err = perf_evsel__mmap(evsel, 0); 203 if (err) { 204 pr_err("failed to mmap evsel: %s\n", strerror(-err)); 205 goto out; 206 } 207 mapped = true; 208 209 pc = perf_evsel__mmap_base(evsel, 0, 0); 210 if (!pc) { 211 pr_err("failed to get mmapped address\n"); 212 goto out; 213 } 214 215 if (!pc->cap_user_rdpmc || !pc->index) { 216 pr_err("userspace counter access not %s\n", 217 !pc->cap_user_rdpmc ? "supported" : "enabled"); 218 ret = TEST_SKIP; 219 goto out; 220 } 221 if (pc->pmc_width < 32) { 222 pr_err("userspace counter width not set (%d)\n", pc->pmc_width); 223 goto out; 224 } 225 226 perf_evsel__read(evsel, 0, 0, &counts); 227 if (counts.val == 0) { 228 pr_err("failed to read value for evsel\n"); 229 goto out; 230 } 231 232 for (i = 0; i < 5; i++) { 233 volatile int count = 0x10000 << i; 234 __u64 start, end, last = 0; 235 236 pr_debug("\tloop = %u, ", count); 237 238 perf_evsel__read(evsel, 0, 0, &counts); 239 start = counts.val; 240 241 while (count--) ; 242 243 perf_evsel__read(evsel, 0, 0, &counts); 244 end = counts.val; 245 246 if ((end - start) < last) { 247 pr_err("invalid counter data: end=%llu start=%llu last= %llu\n", 248 end, start, last); 249 goto out; 250 } 251 last = end - start; 252 pr_debug("count = %llu\n", end - start); 253 } 254 ret = TEST_OK; 255 256 out: 257 if (mapped) 258 perf_evsel__munmap(evsel); 259 if (opened) 260 perf_evsel__close(evsel); 261 perf_evsel__delete(evsel); 262 263 perf_thread_map__put(threads); 264 return ret; 265 } 266 267 static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused, 268 int subtest __maybe_unused) 269 { 270 return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS); 271 } 272 273 static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused, 274 int subtest __maybe_unused) 275 { 276 return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES); 277 } 278 279 static struct test_case tests__basic_mmap[] = { 280 TEST_CASE_REASON("Read samples using the mmap interface", 281 basic_mmap, 282 "permissions"), 283 TEST_CASE_REASON("User space counter reading of instructions", 284 mmap_user_read_instr, 285 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) 286 "permissions" 287 #else 288 "unsupported" 289 #endif 290 ), 291 TEST_CASE_REASON("User space counter reading of cycles", 292 mmap_user_read_cycles, 293 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) 294 "permissions" 295 #else 296 "unsupported" 297 #endif 298 ), 299 { .name = NULL, } 300 }; 301 302 struct test_suite suite__basic_mmap = { 303 .desc = "mmap interface tests", 304 .test_cases = tests__basic_mmap, 305 }; 306