| 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 it |
| 5 | * under the terms of the GNU General Public License as published by the Free |
| 6 | * Software Foundation; only version 2 of the License. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307, 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 | } |
| 151 | ret = LTTCOMM_OK; |
| 152 | end: |
| 153 | return ret; |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Enable all kernel tracepoint events of a channel of the kernel session. |
| 158 | */ |
| 159 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
| 160 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 161 | { |
| 162 | int size, i, ret; |
| 163 | struct ltt_kernel_event *kevent; |
| 164 | struct lttng_event *event_list = NULL; |
| 165 | |
| 166 | /* For each event in the kernel session */ |
| 167 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 168 | if (kevent->enabled == 0) { |
| 169 | ret = kernel_enable_event(kevent); |
| 170 | if (ret < 0) { |
| 171 | /* Enable failed but still continue */ |
| 172 | continue; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
| 178 | if (size < 0) { |
| 179 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 180 | goto end; |
| 181 | } |
| 182 | |
| 183 | for (i = 0; i < size; i++) { |
| 184 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
| 185 | if (kevent == NULL) { |
| 186 | /* Default event type for enable all */ |
| 187 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; |
| 188 | /* Enable each single tracepoint event */ |
| 189 | ret = kernel_create_event(&event_list[i], kchan); |
| 190 | if (ret < 0) { |
| 191 | /* Ignore error here and continue */ |
| 192 | } |
| 193 | } |
| 194 | } |
| 195 | free(event_list); |
| 196 | |
| 197 | ret = LTTCOMM_OK; |
| 198 | end: |
| 199 | return ret; |
| 200 | |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Enable all kernel tracepoint events of a channel of the kernel session. |
| 205 | */ |
| 206 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
| 207 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 208 | { |
| 209 | int ret; |
| 210 | struct lttng_event event; |
| 211 | |
| 212 | init_syscalls_kernel_event(&event); |
| 213 | |
| 214 | DBG("Enabling all syscall tracing"); |
| 215 | |
| 216 | ret = kernel_create_event(&event, kchan); |
| 217 | if (ret < 0) { |
| 218 | if (ret == -EEXIST) { |
| 219 | ret = LTTCOMM_KERN_EVENT_EXIST; |
| 220 | } else { |
| 221 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 222 | } |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | ret = LTTCOMM_OK; |
| 227 | end: |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Enable all kernel events of a channel of the kernel session. |
| 233 | */ |
| 234 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, |
| 235 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
| 236 | { |
| 237 | int ret; |
| 238 | |
| 239 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); |
| 240 | if (ret != LTTCOMM_OK) { |
| 241 | goto end; |
| 242 | } |
| 243 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); |
| 244 | end: |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * ============================ |
| 250 | * UST : The Ultimate Frontier! |
| 251 | * ============================ |
| 252 | */ |
| 253 | |
| 254 | /* |
| 255 | * Enable all UST tracepoints for a channel from a UST session. |
| 256 | */ |
| 257 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, |
| 258 | struct ltt_ust_channel *uchan) |
| 259 | { |
| 260 | int ret, i; |
| 261 | size_t size; |
| 262 | struct lttng_ht_iter iter; |
| 263 | struct ltt_ust_event *uevent = NULL; |
| 264 | struct lttng_event *events = NULL; |
| 265 | |
| 266 | switch (domain) { |
| 267 | case LTTNG_DOMAIN_UST: |
| 268 | { |
| 269 | /* Enable existing events */ |
| 270 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 271 | node.node) { |
| 272 | if (uevent->enabled == 0) { |
| 273 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 274 | if (ret < 0) { |
| 275 | continue; |
| 276 | } |
| 277 | uevent->enabled = 1; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | /* Get all UST available events */ |
| 282 | size = ust_app_list_events(&events); |
| 283 | if (size < 0) { |
| 284 | ret = LTTCOMM_UST_LIST_FAIL; |
| 285 | goto error; |
| 286 | } |
| 287 | |
| 288 | for (i = 0; i < size; i++) { |
| 289 | /* |
| 290 | * Check if event exist and if so, continue since it was enable |
| 291 | * previously. |
| 292 | */ |
| 293 | uevent = trace_ust_find_event_by_name(uchan->events, |
| 294 | events[i].name); |
| 295 | if (uevent != NULL) { |
| 296 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 297 | events[i].pid); |
| 298 | if (ret < 0) { |
| 299 | if (ret != -EEXIST) { |
| 300 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 301 | goto error; |
| 302 | } |
| 303 | } |
| 304 | continue; |
| 305 | } |
| 306 | |
| 307 | /* Create ust event */ |
| 308 | uevent = trace_ust_create_event(&events[i]); |
| 309 | if (uevent == NULL) { |
| 310 | ret = LTTCOMM_FATAL; |
| 311 | goto error_destroy; |
| 312 | } |
| 313 | |
| 314 | /* Create event for the specific PID */ |
| 315 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 316 | events[i].pid); |
| 317 | if (ret < 0) { |
| 318 | if (ret == -EEXIST) { |
| 319 | ret = LTTCOMM_UST_EVENT_EXIST; |
| 320 | goto error; |
| 321 | } else { |
| 322 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 323 | goto error_destroy; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | uevent->enabled = 1; |
| 328 | /* Add ltt ust event to channel */ |
| 329 | rcu_read_lock(); |
| 330 | lttng_ht_add_unique_str(uchan->events, &uevent->node); |
| 331 | rcu_read_unlock(); |
| 332 | } |
| 333 | |
| 334 | free(events); |
| 335 | break; |
| 336 | } |
| 337 | #if 0 |
| 338 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 339 | case LTTNG_DOMAIN_UST_PID: |
| 340 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 341 | #endif |
| 342 | default: |
| 343 | ret = LTTCOMM_UND; |
| 344 | goto error; |
| 345 | } |
| 346 | |
| 347 | return LTTCOMM_OK; |
| 348 | |
| 349 | error_destroy: |
| 350 | trace_ust_destroy_event(uevent); |
| 351 | |
| 352 | error: |
| 353 | free(events); |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Enable UST tracepoint event for a channel from a UST session. |
| 359 | */ |
| 360 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, |
| 361 | struct ltt_ust_channel *uchan, struct lttng_event *event) |
| 362 | { |
| 363 | int ret = LTTCOMM_OK, to_create = 0; |
| 364 | struct ltt_ust_event *uevent; |
| 365 | |
| 366 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
| 367 | if (uevent == NULL) { |
| 368 | uevent = trace_ust_create_event(event); |
| 369 | if (uevent == NULL) { |
| 370 | ret = LTTCOMM_FATAL; |
| 371 | goto error; |
| 372 | } |
| 373 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 374 | to_create = 1; |
| 375 | } |
| 376 | |
| 377 | if (uevent->enabled) { |
| 378 | /* It's already enabled so everything is OK */ |
| 379 | goto end; |
| 380 | } |
| 381 | |
| 382 | uevent->enabled = 1; |
| 383 | |
| 384 | switch (domain) { |
| 385 | case LTTNG_DOMAIN_UST: |
| 386 | { |
| 387 | if (to_create) { |
| 388 | /* Create event on all UST registered apps for session */ |
| 389 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 390 | } else { |
| 391 | /* Enable event on all UST registered apps for session */ |
| 392 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 393 | } |
| 394 | |
| 395 | if (ret < 0) { |
| 396 | if (ret == -EEXIST) { |
| 397 | ret = LTTCOMM_UST_EVENT_EXIST; |
| 398 | goto end; |
| 399 | } else { |
| 400 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 401 | goto error; |
| 402 | } |
| 403 | } |
| 404 | break; |
| 405 | } |
| 406 | #if 0 |
| 407 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 408 | case LTTNG_DOMAIN_UST_PID: |
| 409 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 410 | #endif |
| 411 | default: |
| 412 | ret = LTTCOMM_UND; |
| 413 | goto end; |
| 414 | } |
| 415 | |
| 416 | if (to_create) { |
| 417 | rcu_read_lock(); |
| 418 | /* Add ltt ust event to channel */ |
| 419 | lttng_ht_add_unique_str(uchan->events, &uevent->node); |
| 420 | rcu_read_unlock(); |
| 421 | } |
| 422 | |
| 423 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 424 | to_create ? "created" : "enabled", uchan->name); |
| 425 | |
| 426 | ret = LTTCOMM_OK; |
| 427 | |
| 428 | end: |
| 429 | return ret; |
| 430 | |
| 431 | error: |
| 432 | /* |
| 433 | * Only destroy event on creation time (not enabling time) because if the |
| 434 | * event is found in the channel (to_create == 0), it means that at some |
| 435 | * point the enable_event worked and it's thus valid to keep it alive. |
| 436 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 437 | * everyone up. |
| 438 | */ |
| 439 | if (to_create) { |
| 440 | /* In this code path, the uevent was not added to the hash table */ |
| 441 | trace_ust_destroy_event(uevent); |
| 442 | } |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Disable UST tracepoint of a channel from a UST session. |
| 448 | */ |
| 449 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, |
| 450 | struct ltt_ust_channel *uchan, char *event_name) |
| 451 | { |
| 452 | int ret; |
| 453 | struct ltt_ust_event *uevent; |
| 454 | |
| 455 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
| 456 | if (uevent == NULL) { |
| 457 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; |
| 458 | goto error; |
| 459 | } |
| 460 | |
| 461 | if (uevent->enabled == 0) { |
| 462 | /* It's already enabled so everything is OK */ |
| 463 | ret = LTTCOMM_OK; |
| 464 | goto end; |
| 465 | } |
| 466 | |
| 467 | switch (domain) { |
| 468 | case LTTNG_DOMAIN_UST: |
| 469 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 470 | if (ret < 0 && ret != -EEXIST) { |
| 471 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 472 | goto error; |
| 473 | } |
| 474 | break; |
| 475 | #if 0 |
| 476 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 477 | case LTTNG_DOMAIN_UST_PID: |
| 478 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 479 | #endif |
| 480 | default: |
| 481 | ret = LTTCOMM_UND; |
| 482 | goto error; |
| 483 | } |
| 484 | |
| 485 | uevent->enabled = 0; |
| 486 | ret = LTTCOMM_OK; |
| 487 | |
| 488 | end: |
| 489 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 490 | uchan->name); |
| 491 | |
| 492 | error: |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * Disable all UST tracepoints for a channel from a UST session. |
| 498 | */ |
| 499 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain, |
| 500 | struct ltt_ust_channel *uchan) |
| 501 | { |
| 502 | int ret, i; |
| 503 | size_t size; |
| 504 | struct lttng_ht_iter iter; |
| 505 | struct ltt_ust_event *uevent = NULL; |
| 506 | struct lttng_event *events = NULL; |
| 507 | |
| 508 | switch (domain) { |
| 509 | case LTTNG_DOMAIN_UST: |
| 510 | { |
| 511 | /* Disabling existing events */ |
| 512 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 513 | node.node) { |
| 514 | if (uevent->enabled == 1) { |
| 515 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 516 | if (ret < 0) { |
| 517 | continue; |
| 518 | } |
| 519 | uevent->enabled = 0; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | /* Get all UST available events */ |
| 524 | size = ust_app_list_events(&events); |
| 525 | if (size < 0) { |
| 526 | ret = LTTCOMM_UST_LIST_FAIL; |
| 527 | goto error; |
| 528 | } |
| 529 | |
| 530 | for (i = 0; i < size; i++) { |
| 531 | uevent = trace_ust_find_event_by_name(uchan->events, |
| 532 | events[i].name); |
| 533 | if (uevent != NULL && uevent->enabled == 1) { |
| 534 | ret = ust_app_disable_event_pid(usess, uchan, uevent, |
| 535 | events[i].pid); |
| 536 | if (ret < 0 && ret != -EEXIST) { |
| 537 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 538 | goto error; |
| 539 | } |
| 540 | uevent->enabled = 0; |
| 541 | continue; |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | free(events); |
| 546 | break; |
| 547 | } |
| 548 | #if 0 |
| 549 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 550 | case LTTNG_DOMAIN_UST_PID: |
| 551 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 552 | #endif |
| 553 | default: |
| 554 | ret = LTTCOMM_UND; |
| 555 | goto error; |
| 556 | } |
| 557 | |
| 558 | return LTTCOMM_OK; |
| 559 | |
| 560 | error: |
| 561 | free(events); |
| 562 | return ret; |
| 563 | } |