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__run_ioctl(struct perf_evsel *evsel, 332 int ioc, void *arg, 333 int cpu_map_idx) 334 { 335 int thread; 336 337 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) { 338 int err; 339 int *fd = FD(evsel, cpu_map_idx, thread); 340 341 if (fd == NULL || *fd < 0) 342 return -1; 343 344 err = ioctl(*fd, ioc, arg); 345 346 if (err) 347 return err; 348 } 349 350 return 0; 351 } 352 353 int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx) 354 { 355 return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu_map_idx); 356 } 357 358 int perf_evsel__enable(struct perf_evsel *evsel) 359 { 360 int i; 361 int err = 0; 362 363 for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++) 364 err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i); 365 return err; 366 } 367 368 int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx) 369 { 370 return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu_map_idx); 371 } 372 373 int perf_evsel__disable(struct perf_evsel *evsel) 374 { 375 int i; 376 int err = 0; 377 378 for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++) 379 err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i); 380 return err; 381 } 382 383 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter) 384 { 385 int err = 0, i; 386 387 for (i = 0; i < perf_cpu_map__nr(evsel->cpus) && !err; i++) 388 err = perf_evsel__run_ioctl(evsel, 389 PERF_EVENT_IOC_SET_FILTER, 390 (void *)filter, i); 391 return err; 392 } 393 394 struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel) 395 { 396 return evsel->cpus; 397 } 398 399 struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel) 400 { 401 return evsel->threads; 402 } 403 404 struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel) 405 { 406 return &evsel->attr; 407 } 408 409 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads) 410 { 411 if (ncpus == 0 || nthreads == 0) 412 return 0; 413 414 if (evsel->system_wide) 415 nthreads = 1; 416 417 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id)); 418 if (evsel->sample_id == NULL) 419 return -ENOMEM; 420 421 evsel->id = zalloc(ncpus * nthreads * sizeof(u64)); 422 if (evsel->id == NULL) { 423 xyarray__delete(evsel->sample_id); 424 evsel->sample_id = NULL; 425 return -ENOMEM; 426 } 427 428 return 0; 429 } 430 431 void perf_evsel__free_id(struct perf_evsel *evsel) 432 { 433 xyarray__delete(evsel->sample_id); 434 evsel->sample_id = NULL; 435 zfree(&evsel->id); 436 evsel->ids = 0; 437 } 438 439 void perf_counts_values__scale(struct perf_counts_values *count, 440 bool scale, __s8 *pscaled) 441 { 442 s8 scaled = 0; 443 444 if (scale) { 445 if (count->run == 0) { 446 scaled = -1; 447 count->val = 0; 448 } else if (count->run < count->ena) { 449 scaled = 1; 450 count->val = (u64)((double)count->val * count->ena / count->run); 451 } 452 } 453 454 if (pscaled) 455 *pscaled = scaled; 456 } 457