1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <linux/string.h> 5 6 #include <sched.h> 7 #include <perf/mmap.h> 8 #include "event.h" 9 #include "evlist.h" 10 #include "evsel.h" 11 #include "debug.h" 12 #include "record.h" 13 #include "tests.h" 14 #include "util/mmap.h" 15 #include "util/sample.h" 16 17 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp) 18 { 19 int i, cpu = -1, nrcpus = 1024; 20 realloc: 21 CPU_ZERO(maskp); 22 23 if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) { 24 if (errno == EINVAL && nrcpus < (1024 << 8)) { 25 nrcpus = nrcpus << 2; 26 goto realloc; 27 } 28 perror("sched_getaffinity"); 29 return -1; 30 } 31 32 for (i = 0; i < nrcpus; i++) { 33 if (CPU_ISSET(i, maskp)) { 34 if (cpu == -1) 35 cpu = i; 36 else 37 CPU_CLR(i, maskp); 38 } 39 } 40 41 return cpu; 42 } 43 44 static int test__PERF_RECORD(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 45 { 46 struct record_opts opts = { 47 .target = { 48 .uid = UINT_MAX, 49 .uses_mmap = true, 50 }, 51 .no_buffering = true, 52 .mmap_pages = 256, 53 }; 54 cpu_set_t cpu_mask; 55 size_t cpu_mask_size = sizeof(cpu_mask); 56 struct evlist *evlist = evlist__new_dummy(); 57 struct evsel *evsel; 58 struct perf_sample sample; 59 const char *cmd = "sleep"; 60 const char *argv[] = { cmd, "1", NULL, }; 61 char *bname, *mmap_filename; 62 u64 prev_time = 0; 63 bool found_cmd_mmap = false, 64 found_coreutils_mmap = false, 65 found_libc_mmap = false, 66 found_vdso_mmap = false, 67 found_ld_mmap = false; 68 int err = -1, errs = 0, i, wakeups = 0; 69 u32 cpu; 70 int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; 71 char sbuf[STRERR_BUFSIZE]; 72 73 perf_sample__init(&sample, /*all=*/false); 74 if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ 75 evlist = evlist__new_default(); 76 77 if (evlist == NULL) { 78 pr_debug("Not enough memory to create evlist\n"); 79 goto out; 80 } 81 82 /* 83 * Create maps of threads and cpus to monitor. In this case 84 * we start with all threads and cpus (-1, -1) but then in 85 * evlist__prepare_workload we'll fill in the only thread 86 * we're monitoring, the one forked there. 87 */ 88 err = evlist__create_maps(evlist, &opts.target); 89 if (err < 0) { 90 pr_debug("Not enough memory to create thread/cpu maps\n"); 91 goto out_delete_evlist; 92 } 93 94 /* 95 * Prepare the workload in argv[] to run, it'll fork it, and then wait 96 * for evlist__start_workload() to exec it. This is done this way 97 * so that we have time to open the evlist (calling sys_perf_event_open 98 * on all the fds) and then mmap them. 99 */ 100 err = evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); 101 if (err < 0) { 102 pr_debug("Couldn't run the workload!\n"); 103 goto out_delete_evlist; 104 } 105 106 /* 107 * Config the evsels, setting attr->comm on the first one, etc. 108 */ 109 evsel = evlist__first(evlist); 110 evsel__set_sample_bit(evsel, CPU); 111 evsel__set_sample_bit(evsel, TID); 112 evsel__set_sample_bit(evsel, TIME); 113 evlist__config(evlist, &opts, NULL); 114 115 err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); 116 if (err < 0) { 117 pr_debug("sched__get_first_possible_cpu: %s\n", 118 str_error_r(errno, sbuf, sizeof(sbuf))); 119 goto out_delete_evlist; 120 } 121 122 cpu = err; 123 124 /* 125 * So that we can check perf_sample.cpu on all the samples. 126 */ 127 if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { 128 pr_debug("sched_setaffinity: %s\n", 129 str_error_r(errno, sbuf, sizeof(sbuf))); 130 goto out_delete_evlist; 131 } 132 133 /* 134 * Call sys_perf_event_open on all the fds on all the evsels, 135 * grouping them if asked to. 136 */ 137 err = evlist__open(evlist); 138 if (err < 0) { 139 pr_debug("perf_evlist__open: %s\n", 140 str_error_r(errno, sbuf, sizeof(sbuf))); 141 goto out_delete_evlist; 142 } 143 144 /* 145 * mmap the first fd on a given CPU and ask for events for the other 146 * fds in the same CPU to be injected in the same mmap ring buffer 147 * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). 148 */ 149 err = evlist__mmap(evlist, opts.mmap_pages); 150 if (err < 0) { 151 pr_debug("evlist__mmap: %s\n", 152 str_error_r(errno, sbuf, sizeof(sbuf))); 153 goto out_delete_evlist; 154 } 155 156 /* 157 * Now that all is properly set up, enable the events, they will 158 * count just on workload.pid, which will start... 159 */ 160 evlist__enable(evlist); 161 162 /* 163 * Now! 164 */ 165 evlist__start_workload(evlist); 166 167 while (1) { 168 int before = total_events; 169 170 for (i = 0; i < evlist->core.nr_mmaps; i++) { 171 union perf_event *event; 172 struct mmap *md; 173 174 md = &evlist->mmap[i]; 175 if (perf_mmap__read_init(&md->core) < 0) 176 continue; 177 178 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 179 const u32 type = event->header.type; 180 const char *name = perf_event__name(type); 181 182 ++total_events; 183 if (type < PERF_RECORD_MAX) 184 nr_events[type]++; 185 186 err = evlist__parse_sample(evlist, event, &sample); 187 if (err < 0) { 188 if (verbose > 0) 189 perf_event__fprintf(event, NULL, stderr); 190 pr_debug("Couldn't parse sample\n"); 191 goto out_delete_evlist; 192 } 193 194 if (verbose > 0) { 195 pr_info("%" PRIu64" %d ", sample.time, sample.cpu); 196 perf_event__fprintf(event, NULL, stderr); 197 } 198 199 if (prev_time > sample.time) { 200 pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", 201 name, prev_time, sample.time); 202 ++errs; 203 } 204 205 prev_time = sample.time; 206 207 if (sample.cpu != cpu) { 208 pr_debug("%s with unexpected cpu, expected %d, got %d\n", 209 name, cpu, sample.cpu); 210 ++errs; 211 } 212 213 if ((pid_t)sample.pid != evlist->workload.pid) { 214 pr_debug("%s with unexpected pid, expected %d, got %d\n", 215 name, evlist->workload.pid, sample.pid); 216 ++errs; 217 } 218 219 if ((pid_t)sample.tid != evlist->workload.pid) { 220 pr_debug("%s with unexpected tid, expected %d, got %d\n", 221 name, evlist->workload.pid, sample.tid); 222 ++errs; 223 } 224 225 if ((type == PERF_RECORD_COMM || 226 type == PERF_RECORD_MMAP || 227 type == PERF_RECORD_MMAP2 || 228 type == PERF_RECORD_FORK || 229 type == PERF_RECORD_EXIT) && 230 (pid_t)event->comm.pid != evlist->workload.pid) { 231 pr_debug("%s with unexpected pid/tid\n", name); 232 ++errs; 233 } 234 235 if ((type == PERF_RECORD_COMM || 236 type == PERF_RECORD_MMAP || 237 type == PERF_RECORD_MMAP2) && 238 event->comm.pid != event->comm.tid) { 239 pr_debug("%s with different pid/tid!\n", name); 240 ++errs; 241 } 242 243 switch (type) { 244 case PERF_RECORD_COMM: 245 if (strcmp(event->comm.comm, cmd)) { 246 pr_debug("%s with unexpected comm!\n", name); 247 ++errs; 248 } 249 break; 250 case PERF_RECORD_EXIT: 251 goto found_exit; 252 case PERF_RECORD_MMAP: 253 mmap_filename = event->mmap.filename; 254 goto check_bname; 255 case PERF_RECORD_MMAP2: 256 mmap_filename = event->mmap2.filename; 257 check_bname: 258 bname = strrchr(mmap_filename, '/'); 259 if (bname != NULL) { 260 if (!found_cmd_mmap) 261 found_cmd_mmap = !strcmp(bname + 1, cmd); 262 if (!found_coreutils_mmap) 263 found_coreutils_mmap = !strcmp(bname + 1, "coreutils"); 264 if (!found_libc_mmap) 265 found_libc_mmap = !strncmp(bname + 1, "libc", 4); 266 if (!found_ld_mmap) 267 found_ld_mmap = !strncmp(bname + 1, "ld", 2); 268 } else if (!found_vdso_mmap) 269 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); 270 break; 271 272 case PERF_RECORD_SAMPLE: 273 /* Just ignore samples for now */ 274 break; 275 default: 276 pr_debug("Unexpected perf_event->header.type %d!\n", 277 type); 278 ++errs; 279 } 280 281 perf_mmap__consume(&md->core); 282 } 283 perf_mmap__read_done(&md->core); 284 } 285 286 /* 287 * We don't use poll here because at least at 3.1 times the 288 * PERF_RECORD_{!SAMPLE} events don't honour 289 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. 290 */ 291 if (total_events == before && false) 292 evlist__poll(evlist, -1); 293 294 sleep(1); 295 if (++wakeups > 5) { 296 pr_debug("No PERF_RECORD_EXIT event!\n"); 297 break; 298 } 299 } 300 301 found_exit: 302 if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) { 303 pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); 304 ++errs; 305 } 306 307 if (nr_events[PERF_RECORD_COMM] == 0) { 308 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); 309 ++errs; 310 } 311 312 if (!found_cmd_mmap && !found_coreutils_mmap) { 313 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); 314 ++errs; 315 } 316 317 if (!found_libc_mmap) { 318 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); 319 ++errs; 320 } 321 322 if (!found_ld_mmap) { 323 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); 324 ++errs; 325 } 326 327 if (!found_vdso_mmap) { 328 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); 329 ++errs; 330 } 331 out_delete_evlist: 332 evlist__delete(evlist); 333 out: 334 perf_sample__exit(&sample); 335 if (err == -EACCES) 336 return TEST_SKIP; 337 if (err < 0 || errs != 0) 338 return TEST_FAIL; 339 return TEST_OK; 340 } 341 342 static struct test_case tests__PERF_RECORD[] = { 343 TEST_CASE_REASON("PERF_RECORD_* events & perf_sample fields", 344 PERF_RECORD, 345 "permissions"), 346 { .name = NULL, } 347 }; 348 349 struct test_suite suite__PERF_RECORD = { 350 .desc = "PERF_RECORD_* events & perf_sample fields", 351 .test_cases = tests__PERF_RECORD, 352 }; 353