1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <unistd.h> 4 #include <sys/syscall.h> 5 #include <perf/evsel.h> 6 #include <perf/cpumap.h> 7 #include <perf/threadmap.h> 8 #include <linux/list.h> 9 #include <internal/evsel.h> 10 #include <linux/zalloc.h> 11 #include <stdlib.h> 12 #include <internal/xyarray.h> 13 #include <internal/cpumap.h> 14 #include <internal/mmap.h> 15 #include <internal/threadmap.h> 16 #include <internal/lib.h> 17 #include <linux/string.h> 18 #include <sys/ioctl.h> 19 #include <sys/mman.h> 20 #include <asm/bug.h> 21 22 void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr, 23 int idx) 24 { 25 INIT_LIST_HEAD(&evsel->node); 26 evsel->attr = *attr; 27 evsel->idx = idx; 28 evsel->leader = evsel; 29 } 30 31 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr) 32 { 33 struct perf_evsel *evsel = zalloc(sizeof(*evsel)); 34 35 if (evsel != NULL) 36 perf_evsel__init(evsel, attr, 0); 37 38 return evsel; 39 } 40 41 void perf_evsel__delete(struct perf_evsel *evsel) 42 { 43 free(evsel); 44 } 45 46 #define FD(_evsel, _cpu_map_idx, _thread) \ 47 ((int *)xyarray__entry(_evsel->fd, _cpu_map_idx, _thread)) 48 #define MMAP(_evsel, _cpu_map_idx, _thread) \ 49 (_evsel->mmap ? ((struct perf_mmap *) xyarray__entry(_evsel->mmap, _cpu_map_idx, _thread)) \ 50 : NULL) 51 52 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) 53 { 54 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int)); 55 56 if (evsel->fd) { 57 int idx, thread; 58 59 for (idx = 0; idx < ncpus; idx++) { 60 for (thread = 0; thread < nthreads; thread++) { 61 int *fd = FD(evsel, idx, thread); 62 63 if (fd) 64 *fd = -1; 65 } 66 } 67 } 68 69 return evsel->fd != NULL ? 0 : -ENOMEM; 70 } 71 72 static int perf_evsel__alloc_mmap(struct perf_evsel *evsel, int ncpus, int nthreads) 73 { 74 evsel->mmap = xyarray__new(ncpus, nthreads, sizeof(struct perf_mmap)); 75 76 return evsel->mmap != NULL ? 0 : -ENOMEM; 77 } 78 79 static int 80 sys_perf_event_open(struct perf_event_attr *attr, 81 pid_t pid, struct perf_cpu cpu, int group_fd, 82 unsigned long flags) 83 { 84 return syscall(__NR_perf_event_open, attr, pid, cpu.cpu, group_fd, flags); 85 } 86 87 static int get_group_fd(struct perf_evsel *evsel, int cpu_map_idx, int thread, int *group_fd) 88 { 89 struct perf_evsel *leader = evsel->leader; 90 int *fd; 91 92 if (evsel == leader) { 93 *group_fd = -1; 94 return 0; 95 } 96 97 /* 98 * Leader must be already processed/open, 99 * if not it's a bug. 100 */ 101 if (!leader->fd) 102 return -ENOTCONN; 103 104 fd = FD(leader, cpu_map_idx, thread); 105 if (fd == NULL || *fd == -1) 106 return -EBADF; 107 108 *group_fd = *fd; 109 110 return 0; 111 } 112 113 int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus, 114 struct perf_thread_map *threads) 115 { 116 struct perf_cpu cpu; 117 int idx, thread, err = 0; 118 119 if (cpus == NULL) { 120 static struct perf_cpu_map *empty_cpu_map; 121 122 if (empty_cpu_map == NULL) { 123 empty_cpu_map = perf_cpu_map__dummy_new(); 124 if (empty_cpu_map == NULL) 125 return -ENOMEM; 126 } 127 128 cpus = empty_cpu_map; 129 } 130 131 if (threads == NULL) { 132 static struct perf_thread_map *empty_thread_map; 133 134 if (empty_thread_map == NULL) { 135 empty_thread_map = perf_thread_map__new_dummy(); 136 if (empty_thread_map == NULL) 137 return -ENOMEM; 138 } 139 140 threads = empty_thread_map; 141 } 142 143 if (evsel->fd == NULL && 144 perf_evsel__alloc_fd(evsel, perf_cpu_map__nr(cpus), threads->nr) < 0) 145 return -ENOMEM; 146 147 perf_cpu_map__for_each_cpu(cpu, idx, cpus) { 148 for (thread = 0; thread < threads->nr; thread++) { 149 int fd, group_fd, *evsel_fd; 150 151 evsel_fd = FD(evsel, idx, thread); 152 if (evsel_fd == NULL) 153 return -EINVAL; 154 155 err = get_group_fd(evsel, idx, thread, &group_fd); 156 if (err < 0) 157 return err; 158 159 fd = sys_perf_event_open(&evsel->attr, 160 threads->map[thread].pid, 161 cpu, group_fd, 0); 162 163 if (fd < 0) 164 return -errno; 165 166 *evsel_fd = fd; 167 } 168 } 169 170 return err; 171 } 172 173 static void perf_evsel__close_fd_cpu(struct perf_evsel *evsel, int cpu_map_idx) 174 { 175 int thread; 176 177 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) { 178 int *fd = FD(evsel, cpu_map_idx, thread); 179 180 if (fd && *fd >= 0) { 181 close(*fd); 182 *fd = -1; 183 } 184 } 185 } 186 187 void perf_evsel__close_fd(struct perf_evsel *evsel) 188 { 189 for (int idx = 0; idx < xyarray__max_x(evsel->fd); idx++) 190 perf_evsel__close_fd_cpu(evsel, idx); 191 } 192 193 void perf_evsel__free_fd(struct perf_evsel *evsel) 194 { 195 xyarray__delete(evsel->fd); 196 evsel->fd = NULL; 197 } 198 199 void perf_evsel__close(struct perf_evsel *evsel) 200 { 201 if (evsel->fd == NULL) 202 return; 203 204 perf_evsel__close_fd(evsel); 205 perf_evsel__free_fd(evsel); 206 } 207 208 void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu_map_idx) 209 { 210 if (evsel->fd == NULL) 211 return; 212 213 perf_evsel__close_fd_cpu(evsel, cpu_map_idx); 214 } 215 216 void perf_evsel__munmap(struct perf_evsel *evsel) 217 { 218 int idx, thread; 219 220 if (evsel->fd == NULL || evsel->mmap == NULL) 221 return; 222 223 for (idx = 0; idx < xyarray__max_x(evsel->fd); idx++) { 224 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) { 225 int *fd = FD(evsel, idx, thread); 226 227 if (fd == NULL || *fd < 0) 228 continue; 229 230 perf_mmap__munmap(MMAP(evsel, idx, thread)); 231 } 232 } 233 234 xyarray__delete(evsel->mmap); 235 evsel->mmap = NULL; 236 } 237 238 int perf_evsel__mmap(struct perf_evsel *evsel, int pages) 239 { 240 int ret, idx, thread; 241 struct perf_mmap_param mp = { 242 .prot = PROT_READ | PROT_WRITE, 243 .mask = (pages * page_size) - 1, 244 }; 245 246 if (evsel->fd == NULL || evsel->mmap) 247 return -EINVAL; 248 249 if (perf_evsel__alloc_mmap(evsel, xyarray__max_x(evsel->fd), xyarray__max_y(evsel->fd)) < 0) 250 return -ENOMEM; 251 252 for (idx = 0; idx < xyarray__max_x(evsel->fd); idx++) { 253 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) { 254 int *fd = FD(evsel, idx, thread); 255 struct perf_mmap *map; 256 struct perf_cpu cpu = perf_cpu_map__cpu(evsel->cpus, idx); 257 258 if (fd == NULL || *fd < 0) 259 continue; 260 261 map = MMAP(evsel, idx, thread); 262 perf_mmap__init(map, NULL, false, NULL); 263 264 ret = perf_mmap__mmap(map, &mp, *fd, cpu); 265 if (ret) { 266 perf_evsel__munmap(evsel); 267 return ret; 268 } 269 } 270 } 271 272 return 0; 273 } 274 275 void *perf_evsel__mmap_base(struct perf_evsel *evsel, int cpu_map_idx, int thread) 276 { 277 int *fd = FD(evsel, cpu_map_idx, thread); 278 279 if (fd == NULL || *fd < 0 || MMAP(evsel, cpu_map_idx, thread) == NULL) 280 return NULL; 281 282 return MMAP(evsel, cpu_map_idx, thread)->base; 283 } 284 285 int perf_evsel__read_size(struct perf_evsel *evsel) 286 { 287 u64 read_format = evsel->attr.read_format; 288 int entry = sizeof(u64); /* value */ 289 int size = 0; 290 int nr = 1; 291 292 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 293 size += sizeof(u64); 294 295 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 296 size += sizeof(u64); 297 298 if (read_format & PERF_FORMAT_ID) 299 entry += sizeof(u64); 300 301 if (read_format & PERF_FORMAT_GROUP) { 302 nr = evsel->nr_members; 303 size += sizeof(u64); 304 } 305 306 size += entry * nr; 307 return size; 308 } 309 310 int perf_evsel__read(struct perf_evsel *evsel, int cpu_map_idx, int thread, 311 struct perf_counts_values *count) 312 { 313 size_t size = perf_evsel__read_size(evsel); 314 int *fd = FD(evsel, cpu_map_idx, thread); 315 316 memset(count, 0, sizeof(*count)); 317 318 if (fd == NULL || *fd < 0) 319 return -EINVAL; 320 321 if (MMAP(evsel, cpu_map_idx, thread) && 322 !perf_mmap__read_self(MMAP(evsel, cpu_map_idx, thread), count)) 323 return 0; 324 325 if (readn(*fd, count->values, size) <= 0) 326 return -errno; 327 328 return 0; 329 } 330 331 static int perf_evsel__ioctl(struct perf_evsel *evsel, int ioc, void *arg, 332 int cpu_map_idx, int thread) 333 { 334 int *fd = FD(evsel, cpu_map_idx, thread); 335 336 if (fd == NULL || *fd < 0) 337 return -1; 338 339 return ioctl(*fd, ioc, arg); 340 } 341 342 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, 343 int ioc, void *arg, 344 int cpu_map_idx) 345 { 346 int thread; 347 348 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) { 349 int err = perf_evsel__ioctl(evsel, ioc, arg, cpu_map_idx, thread); 350 351 if (err) 352 return err; 353 } 354 355 return 0; 356 } 357 358 int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx) 359 { 360 return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu_map_idx); 361 } 362 363 int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread) 364 { 365 struct perf_cpu cpu __maybe_unused; 366 int idx; 367 int err; 368 369 perf_cpu_map__for_each_cpu(cpu, idx, evsel->cpus) { 370 err = perf_evsel__ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, idx, thread); 371 if (err) 372 return err; 373 } 374 375 return 0; 376 } 377 378 int perf_evsel__enable(struct perf_evsel *evsel) 379 { 380 int i; 381 int err = 0; 382 383 for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++) 384 err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i); 385 return err; 386 } 387 388 int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx) 389 { 390 return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu_map_idx); 391 } 392 393 int perf_evsel__disable(struct perf_evsel *evsel) 394 { 395 int i; 396 int err = 0; 397 398 for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++) 399 err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i); 400 return err; 401 } 402 403 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter) 404 { 405 int err = 0, i; 406 407 for (i = 0; i < perf_cpu_map__nr(evsel->cpus) && !err; i++) 408 err = perf_evsel__run_ioctl(evsel, 409 PERF_EVENT_IOC_SET_FILTER, 410 (void *)filter, i); 411 return err; 412 } 413 414 struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel) 415 { 416 return evsel->cpus; 417 } 418 419 struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel) 420 { 421 return evsel->threads; 422 } 423 424 struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel) 425 { 426 return &evsel->attr; 427 } 428 429 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads) 430 { 431 if (ncpus == 0 || nthreads == 0) 432 return 0; 433 434 if (evsel->system_wide) 435 nthreads = 1; 436 437 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id)); 438 if (evsel->sample_id == NULL) 439 return -ENOMEM; 440 441 evsel->id = zalloc(ncpus * nthreads * sizeof(u64)); 442 if (evsel->id == NULL) { 443 xyarray__delete(evsel->sample_id); 444 evsel->sample_id = NULL; 445 return -ENOMEM; 446 } 447 448 return 0; 449 } 450 451 void perf_evsel__free_id(struct perf_evsel *evsel) 452 { 453 xyarray__delete(evsel->sample_id); 454 evsel->sample_id = NULL; 455 zfree(&evsel->id); 456 evsel->ids = 0; 457 } 458 459 void perf_counts_values__scale(struct perf_counts_values *count, 460 bool scale, __s8 *pscaled) 461 { 462 s8 scaled = 0; 463 464 if (scale) { 465 if (count->run == 0) { 466 scaled = -1; 467 count->val = 0; 468 } else if (count->run < count->ena) { 469 scaled = 1; 470 count->val = (u64)((double)count->val * count->ena / count->run); 471 } 472 } 473 474 if (pscaled) 475 *pscaled = scaled; 476 } 477