| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <errno.h> |
| 20 | #include <urcu/list.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include <lttng/lttng.h> |
| 24 | #include <common/error.h> |
| 25 | #include <common/sessiond-comm/sessiond-comm.h> |
| 26 | |
| 27 | #include "channel.h" |
| 28 | #include "event.h" |
| 29 | #include "kernel.h" |
| 30 | #include "ust-ctl.h" |
| 31 | #include "ust-app.h" |
| 32 | #include "trace-kernel.h" |
| 33 | #include "trace-ust.h" |
| 34 | |
| 35 | /* |
| 36 | * Setup a lttng_event used to enable *all* syscall tracing. |
| 37 | */ |
| 38 | static void init_syscalls_kernel_event(struct lttng_event *event) |
| 39 | { |
| 40 | event->name[0] = '\0'; |
| 41 | /* |
| 42 | * We use LTTNG_EVENT* here since the trace kernel creation will make the |
| 43 | * right changes for the kernel. |
| 44 | */ |
| 45 | event->type = LTTNG_EVENT_SYSCALL; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Disable kernel tracepoint event for a channel from the kernel session. |
| 50 | */ |
| 51 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
| 52 | struct ltt_kernel_channel *kchan, char *event_name) |
| 53 | { |
| 54 | int ret; |
| 55 | struct ltt_kernel_event *kevent; |
| 56 | |
| 57 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
| 58 | if (kevent == NULL) { |
| 59 | ret = LTTCOMM_NO_EVENT; |
| 60 | goto error; |
| 61 | } |
| 62 | |
| 63 | ret = kernel_disable_event(kevent); |
| 64 | if (ret < 0) { |
| 65 | ret = LTTCOMM_KERN_DISABLE_FAIL; |
| 66 | goto error; |
| 67 | } |
| 68 | |
| 69 | DBG("Kernel event %s disable for channel %s.", |
| 70 | kevent->event->name, kchan->channel->name); |
| 71 | |
| 72 | ret = LTTCOMM_OK; |
| 73 | |
| 74 | error: |
| 75 | return ret; |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Disable kernel tracepoint events for a channel from the kernel session. |
| 80 | */ |
| 81 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
| 82 | struct ltt_kernel_channel *kchan) |
| 83 | { |
| 84 | int ret; |
| 85 | struct ltt_kernel_event *kevent; |
| 86 | |
| 87 | /* For each event in the kernel session */ |
| 88 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 89 | ret = kernel_disable_event(kevent); |
| 90 | if (ret < 0) { |
| 91 | /* We continue disabling the rest */ |
| 92 | continue; |
| 93 | } |
| 94 | } |
| 95 | ret = LTTCOMM_OK; |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Disable kernel syscall events for a channel from the kernel session. |
| 101 | */ |
| 102 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, |
| 103 | struct ltt_kernel_channel *kchan) |
| 104 | { |
| 105 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); |
| 106 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Disable all kernel event for a channel from the kernel session. |
| 111 | */ |
| 112 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, |
| 113 | struct ltt_kernel_channel *kchan) |
| 114 | { |
| 115 | int ret; |
| 116 | |
| 117 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); |
| 118 | if (ret != LTTCOMM_OK) |
| 119 | return ret; |
| 120 | ret = event_kernel_disable_all_syscalls(ksession, kchan); |
| 121 | return ret; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Enable kernel tracepoint event for a channel from the kernel session. |
| 126 | */ |
| 127 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
| 128 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
| 129 | { |
| 130 | int ret; |
| 131 | struct ltt_kernel_event *kevent; |
| 132 | |
| 133 | kevent = trace_kernel_get_event_by_name(event->name, kchan); |
| 134 | if (kevent == NULL) { |
| 135 | ret = kernel_create_event(event, kchan); |
| 136 | if (ret < 0) { |
| 137 | if (ret == -EEXIST) { |
| 138 | ret = LTTCOMM_KERN_EVENT_EXIST; |
| 139 | } else { |
| 140 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 141 | } |
| 142 | goto end; |
| 143 | } |
| 144 | } else if (kevent->enabled == 0) { |
| 145 | ret = kernel_enable_event(kevent); |
| 146 | if (ret < 0) { |
| 147 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 148 | goto end; |
| 149 | } |
| 150 | } else { |
| 151 | /* At this point, the event is considered enabled */ |
| 152 | ret = LTTCOMM_KERN_EVENT_EXIST; |
| 153 | goto end; |
| 154 | } |
| 155 | |
| 156 | ret = LTTCOMM_OK; |
| 157 | end: |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Enable all kernel tracepoint events of a channel of the kernel session. |
| 163 | */ |
| 164 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
| 165 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 166 | { |
| 167 | int size, i, ret; |
| 168 | struct ltt_kernel_event *kevent; |
| 169 | struct lttng_event *event_list = NULL; |
| 170 | |
| 171 | /* For each event in the kernel session */ |
| 172 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 173 | if (kevent->enabled == 0) { |
| 174 | ret = kernel_enable_event(kevent); |
| 175 | if (ret < 0) { |
| 176 | /* Enable failed but still continue */ |
| 177 | continue; |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
| 183 | if (size < 0) { |
| 184 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 185 | goto end; |
| 186 | } |
| 187 | |
| 188 | for (i = 0; i < size; i++) { |
| 189 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
| 190 | if (kevent == NULL) { |
| 191 | /* Default event type for enable all */ |
| 192 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; |
| 193 | /* Enable each single tracepoint event */ |
| 194 | ret = kernel_create_event(&event_list[i], kchan); |
| 195 | if (ret < 0) { |
| 196 | /* Ignore error here and continue */ |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | free(event_list); |
| 201 | |
| 202 | ret = LTTCOMM_OK; |
| 203 | end: |
| 204 | return ret; |
| 205 | |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * Enable all kernel tracepoint events of a channel of the kernel session. |
| 210 | */ |
| 211 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
| 212 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 213 | { |
| 214 | int ret; |
| 215 | struct lttng_event event; |
| 216 | |
| 217 | init_syscalls_kernel_event(&event); |
| 218 | |
| 219 | DBG("Enabling all syscall tracing"); |
| 220 | |
| 221 | ret = kernel_create_event(&event, kchan); |
| 222 | if (ret < 0) { |
| 223 | if (ret == -EEXIST) { |
| 224 | ret = LTTCOMM_KERN_EVENT_EXIST; |
| 225 | } else { |
| 226 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 227 | } |
| 228 | goto end; |
| 229 | } |
| 230 | |
| 231 | ret = LTTCOMM_OK; |
| 232 | end: |
| 233 | return ret; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Enable all kernel events of a channel of the kernel session. |
| 238 | */ |
| 239 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, |
| 240 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 241 | { |
| 242 | int ret; |
| 243 | |
| 244 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); |
| 245 | if (ret != LTTCOMM_OK) { |
| 246 | goto end; |
| 247 | } |
| 248 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); |
| 249 | end: |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * ============================ |
| 255 | * UST : The Ultimate Frontier! |
| 256 | * ============================ |
| 257 | */ |
| 258 | |
| 259 | /* |
| 260 | * Enable all UST tracepoints for a channel from a UST session. |
| 261 | */ |
| 262 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, |
| 263 | struct ltt_ust_channel *uchan) |
| 264 | { |
| 265 | int ret, i; |
| 266 | size_t size; |
| 267 | struct lttng_ht_iter iter; |
| 268 | struct ltt_ust_event *uevent = NULL; |
| 269 | struct lttng_event *events = NULL; |
| 270 | |
| 271 | switch (domain) { |
| 272 | case LTTNG_DOMAIN_UST: |
| 273 | { |
| 274 | /* Enable existing events */ |
| 275 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 276 | node.node) { |
| 277 | if (uevent->enabled == 0) { |
| 278 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 279 | if (ret < 0) { |
| 280 | continue; |
| 281 | } |
| 282 | uevent->enabled = 1; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /* Get all UST available events */ |
| 287 | size = ust_app_list_events(&events); |
| 288 | if (size < 0) { |
| 289 | ret = LTTCOMM_UST_LIST_FAIL; |
| 290 | goto error; |
| 291 | } |
| 292 | |
| 293 | for (i = 0; i < size; i++) { |
| 294 | /* |
| 295 | * Check if event exist and if so, continue since it was enable |
| 296 | * previously. |
| 297 | */ |
| 298 | uevent = trace_ust_find_event_by_name(uchan->events, |
| 299 | events[i].name); |
| 300 | if (uevent != NULL) { |
| 301 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 302 | events[i].pid); |
| 303 | if (ret < 0) { |
| 304 | if (ret != -EEXIST) { |
| 305 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 306 | goto error; |
| 307 | } |
| 308 | } |
| 309 | continue; |
| 310 | } |
| 311 | |
| 312 | /* Create ust event */ |
| 313 | uevent = trace_ust_create_event(&events[i]); |
| 314 | if (uevent == NULL) { |
| 315 | ret = LTTCOMM_FATAL; |
| 316 | goto error_destroy; |
| 317 | } |
| 318 | |
| 319 | /* Create event for the specific PID */ |
| 320 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 321 | events[i].pid); |
| 322 | if (ret < 0) { |
| 323 | if (ret == -EEXIST) { |
| 324 | ret = LTTCOMM_UST_EVENT_EXIST; |
| 325 | goto error; |
| 326 | } else { |
| 327 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 328 | goto error_destroy; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | uevent->enabled = 1; |
| 333 | /* Add ltt ust event to channel */ |
| 334 | rcu_read_lock(); |
| 335 | lttng_ht_add_unique_str(uchan->events, &uevent->node); |
| 336 | rcu_read_unlock(); |
| 337 | } |
| 338 | |
| 339 | free(events); |
| 340 | break; |
| 341 | } |
| 342 | #if 0 |
| 343 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 344 | case LTTNG_DOMAIN_UST_PID: |
| 345 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 346 | #endif |
| 347 | default: |
| 348 | ret = LTTCOMM_UND; |
| 349 | goto error; |
| 350 | } |
| 351 | |
| 352 | return LTTCOMM_OK; |
| 353 | |
| 354 | error_destroy: |
| 355 | trace_ust_destroy_event(uevent); |
| 356 | |
| 357 | error: |
| 358 | free(events); |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * Enable UST tracepoint event for a channel from a UST session. |
| 364 | */ |
| 365 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, |
| 366 | struct ltt_ust_channel *uchan, struct lttng_event *event) |
| 367 | { |
| 368 | int ret = LTTCOMM_OK, to_create = 0; |
| 369 | struct ltt_ust_event *uevent; |
| 370 | |
| 371 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
| 372 | if (uevent == NULL) { |
| 373 | uevent = trace_ust_create_event(event); |
| 374 | if (uevent == NULL) { |
| 375 | ret = LTTCOMM_FATAL; |
| 376 | goto error; |
| 377 | } |
| 378 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 379 | to_create = 1; |
| 380 | } |
| 381 | |
| 382 | if (uevent->enabled) { |
| 383 | /* It's already enabled so everything is OK */ |
| 384 | goto end; |
| 385 | } |
| 386 | |
| 387 | uevent->enabled = 1; |
| 388 | |
| 389 | switch (domain) { |
| 390 | case LTTNG_DOMAIN_UST: |
| 391 | { |
| 392 | if (to_create) { |
| 393 | /* Create event on all UST registered apps for session */ |
| 394 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 395 | } else { |
| 396 | /* Enable event on all UST registered apps for session */ |
| 397 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 398 | } |
| 399 | |
| 400 | if (ret < 0) { |
| 401 | if (ret == -EEXIST) { |
| 402 | ret = LTTCOMM_UST_EVENT_EXIST; |
| 403 | goto end; |
| 404 | } else { |
| 405 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 406 | goto error; |
| 407 | } |
| 408 | } |
| 409 | break; |
| 410 | } |
| 411 | #if 0 |
| 412 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 413 | case LTTNG_DOMAIN_UST_PID: |
| 414 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 415 | #endif |
| 416 | default: |
| 417 | ret = LTTCOMM_UND; |
| 418 | goto end; |
| 419 | } |
| 420 | |
| 421 | if (to_create) { |
| 422 | rcu_read_lock(); |
| 423 | /* Add ltt ust event to channel */ |
| 424 | lttng_ht_add_unique_str(uchan->events, &uevent->node); |
| 425 | rcu_read_unlock(); |
| 426 | } |
| 427 | |
| 428 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 429 | to_create ? "created" : "enabled", uchan->name); |
| 430 | |
| 431 | ret = LTTCOMM_OK; |
| 432 | |
| 433 | end: |
| 434 | return ret; |
| 435 | |
| 436 | error: |
| 437 | /* |
| 438 | * Only destroy event on creation time (not enabling time) because if the |
| 439 | * event is found in the channel (to_create == 0), it means that at some |
| 440 | * point the enable_event worked and it's thus valid to keep it alive. |
| 441 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 442 | * everyone up. |
| 443 | */ |
| 444 | if (to_create) { |
| 445 | /* In this code path, the uevent was not added to the hash table */ |
| 446 | trace_ust_destroy_event(uevent); |
| 447 | } |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Disable UST tracepoint of a channel from a UST session. |
| 453 | */ |
| 454 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, |
| 455 | struct ltt_ust_channel *uchan, char *event_name) |
| 456 | { |
| 457 | int ret; |
| 458 | struct ltt_ust_event *uevent; |
| 459 | |
| 460 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
| 461 | if (uevent == NULL) { |
| 462 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; |
| 463 | goto error; |
| 464 | } |
| 465 | |
| 466 | if (uevent->enabled == 0) { |
| 467 | /* It's already enabled so everything is OK */ |
| 468 | ret = LTTCOMM_OK; |
| 469 | goto end; |
| 470 | } |
| 471 | |
| 472 | switch (domain) { |
| 473 | case LTTNG_DOMAIN_UST: |
| 474 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 475 | if (ret < 0 && ret != -EEXIST) { |
| 476 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 477 | goto error; |
| 478 | } |
| 479 | break; |
| 480 | #if 0 |
| 481 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 482 | case LTTNG_DOMAIN_UST_PID: |
| 483 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 484 | #endif |
| 485 | default: |
| 486 | ret = LTTCOMM_UND; |
| 487 | goto error; |
| 488 | } |
| 489 | |
| 490 | uevent->enabled = 0; |
| 491 | ret = LTTCOMM_OK; |
| 492 | |
| 493 | end: |
| 494 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 495 | uchan->name); |
| 496 | |
| 497 | error: |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Disable all UST tracepoints for a channel from a UST session. |
| 503 | */ |
| 504 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain, |
| 505 | struct ltt_ust_channel *uchan) |
| 506 | { |
| 507 | int ret, i; |
| 508 | size_t size; |
| 509 | struct lttng_ht_iter iter; |
| 510 | struct ltt_ust_event *uevent = NULL; |
| 511 | struct lttng_event *events = NULL; |
| 512 | |
| 513 | switch (domain) { |
| 514 | case LTTNG_DOMAIN_UST: |
| 515 | { |
| 516 | /* Disabling existing events */ |
| 517 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 518 | node.node) { |
| 519 | if (uevent->enabled == 1) { |
| 520 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 521 | if (ret < 0) { |
| 522 | continue; |
| 523 | } |
| 524 | uevent->enabled = 0; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* Get all UST available events */ |
| 529 | size = ust_app_list_events(&events); |
| 530 | if (size < 0) { |
| 531 | ret = LTTCOMM_UST_LIST_FAIL; |
| 532 | goto error; |
| 533 | } |
| 534 | |
| 535 | for (i = 0; i < size; i++) { |
| 536 | uevent = trace_ust_find_event_by_name(uchan->events, |
| 537 | events[i].name); |
| 538 | if (uevent != NULL && uevent->enabled == 1) { |
| 539 | ret = ust_app_disable_event_pid(usess, uchan, uevent, |
| 540 | events[i].pid); |
| 541 | if (ret < 0 && ret != -EEXIST) { |
| 542 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 543 | goto error; |
| 544 | } |
| 545 | uevent->enabled = 0; |
| 546 | continue; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | free(events); |
| 551 | break; |
| 552 | } |
| 553 | #if 0 |
| 554 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 555 | case LTTNG_DOMAIN_UST_PID: |
| 556 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 557 | #endif |
| 558 | default: |
| 559 | ret = LTTCOMM_UND; |
| 560 | goto error; |
| 561 | } |
| 562 | |
| 563 | return LTTCOMM_OK; |
| 564 | |
| 565 | error: |
| 566 | free(events); |
| 567 | return ret; |
| 568 | } |