| 1 | /* |
| 2 | * lttng-events.c |
| 3 | * |
| 4 | * Holds LTTng per-session event registry. |
| 5 | * |
| 6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; only |
| 11 | * version 2.1 of the License. |
| 12 | * |
| 13 | * This library is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with this library; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #define _LGPL_SOURCE |
| 24 | #include <stdio.h> |
| 25 | #include <assert.h> |
| 26 | #include <errno.h> |
| 27 | #include <limits.h> |
| 28 | #include <pthread.h> |
| 29 | #include <sys/shm.h> |
| 30 | #include <sys/ipc.h> |
| 31 | #include <stdint.h> |
| 32 | #include <stddef.h> |
| 33 | #include <inttypes.h> |
| 34 | #include <time.h> |
| 35 | #include <stdbool.h> |
| 36 | #include <unistd.h> |
| 37 | #include <lttng/ust-endian.h> |
| 38 | |
| 39 | #include <urcu-bp.h> |
| 40 | #include <urcu/arch.h> |
| 41 | #include <urcu/compiler.h> |
| 42 | #include <urcu/hlist.h> |
| 43 | #include <urcu/list.h> |
| 44 | #include <urcu/uatomic.h> |
| 45 | |
| 46 | #include <lttng/tracepoint.h> |
| 47 | #include <lttng/ust-events.h> |
| 48 | |
| 49 | #include <usterr-signal-safe.h> |
| 50 | #include <helper.h> |
| 51 | #include <lttng/ust-ctl.h> |
| 52 | #include <ust-comm.h> |
| 53 | #include <ust-fd.h> |
| 54 | #include <lttng/ust-dynamic-type.h> |
| 55 | #include <lttng/ust-context-provider.h> |
| 56 | #include "error.h" |
| 57 | #include "compat.h" |
| 58 | #include "lttng-ust-uuid.h" |
| 59 | |
| 60 | #include "tracepoint-internal.h" |
| 61 | #include "string-utils.h" |
| 62 | #include "lttng-tracer.h" |
| 63 | #include "lttng-tracer-core.h" |
| 64 | #include "lttng-ust-statedump.h" |
| 65 | #include "ust-events-internal.h" |
| 66 | #include "wait.h" |
| 67 | #include "../libringbuffer/shm.h" |
| 68 | #include "jhash.h" |
| 69 | #include <lttng/ust-abi.h> |
| 70 | |
| 71 | /* |
| 72 | * All operations within this file are called by the communication |
| 73 | * thread, under ust_lock protection. |
| 74 | */ |
| 75 | |
| 76 | static CDS_LIST_HEAD(sessions); |
| 77 | static CDS_LIST_HEAD(event_notifier_groups); |
| 78 | |
| 79 | struct cds_list_head *_lttng_get_sessions(void) |
| 80 | { |
| 81 | return &sessions; |
| 82 | } |
| 83 | |
| 84 | static void _lttng_event_destroy(struct lttng_event *event); |
| 85 | static void _lttng_event_notifier_destroy( |
| 86 | struct lttng_event_notifier *event_notifier); |
| 87 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
| 88 | |
| 89 | static |
| 90 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
| 91 | static |
| 92 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
| 93 | static |
| 94 | void lttng_event_notifier_group_sync_enablers( |
| 95 | struct lttng_event_notifier_group *event_notifier_group); |
| 96 | static |
| 97 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
| 98 | |
| 99 | /* |
| 100 | * Called with ust lock held. |
| 101 | */ |
| 102 | int lttng_session_active(void) |
| 103 | { |
| 104 | struct lttng_session *iter; |
| 105 | |
| 106 | cds_list_for_each_entry(iter, &sessions, node) { |
| 107 | if (iter->active) |
| 108 | return 1; |
| 109 | } |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static |
| 114 | int lttng_loglevel_match(int loglevel, |
| 115 | unsigned int has_loglevel, |
| 116 | enum lttng_ust_loglevel_type req_type, |
| 117 | int req_loglevel) |
| 118 | { |
| 119 | if (!has_loglevel) |
| 120 | loglevel = TRACE_DEFAULT; |
| 121 | switch (req_type) { |
| 122 | case LTTNG_UST_LOGLEVEL_RANGE: |
| 123 | if (loglevel <= req_loglevel |
| 124 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
| 125 | return 1; |
| 126 | else |
| 127 | return 0; |
| 128 | case LTTNG_UST_LOGLEVEL_SINGLE: |
| 129 | if (loglevel == req_loglevel |
| 130 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
| 131 | return 1; |
| 132 | else |
| 133 | return 0; |
| 134 | case LTTNG_UST_LOGLEVEL_ALL: |
| 135 | default: |
| 136 | if (loglevel <= TRACE_DEBUG) |
| 137 | return 1; |
| 138 | else |
| 139 | return 0; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | void synchronize_trace(void) |
| 144 | { |
| 145 | synchronize_rcu(); |
| 146 | } |
| 147 | |
| 148 | struct lttng_session *lttng_session_create(void) |
| 149 | { |
| 150 | struct lttng_session *session; |
| 151 | int i; |
| 152 | |
| 153 | session = zmalloc(sizeof(struct lttng_session)); |
| 154 | if (!session) |
| 155 | return NULL; |
| 156 | if (lttng_session_context_init(&session->ctx)) { |
| 157 | free(session); |
| 158 | return NULL; |
| 159 | } |
| 160 | CDS_INIT_LIST_HEAD(&session->chan_head); |
| 161 | CDS_INIT_LIST_HEAD(&session->events_head); |
| 162 | CDS_INIT_LIST_HEAD(&session->enums_head); |
| 163 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
| 164 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
| 165 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); |
| 166 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
| 167 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); |
| 168 | cds_list_add(&session->node, &sessions); |
| 169 | return session; |
| 170 | } |
| 171 | |
| 172 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
| 173 | { |
| 174 | struct lttng_event_notifier_group *event_notifier_group; |
| 175 | int i; |
| 176 | |
| 177 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); |
| 178 | if (!event_notifier_group) |
| 179 | return NULL; |
| 180 | |
| 181 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
| 182 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); |
| 183 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) |
| 184 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); |
| 185 | |
| 186 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); |
| 187 | |
| 188 | return event_notifier_group; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Only used internally at session destruction. |
| 193 | */ |
| 194 | static |
| 195 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) |
| 196 | { |
| 197 | struct channel *chan; |
| 198 | struct lttng_ust_shm_handle *handle; |
| 199 | |
| 200 | cds_list_del(<tng_chan->node); |
| 201 | lttng_destroy_context(lttng_chan->ctx); |
| 202 | chan = lttng_chan->chan; |
| 203 | handle = lttng_chan->handle; |
| 204 | /* |
| 205 | * note: lttng_chan is private data contained within handle. It |
| 206 | * will be freed along with the handle. |
| 207 | */ |
| 208 | channel_destroy(chan, handle, 0); |
| 209 | } |
| 210 | |
| 211 | static |
| 212 | void register_event(struct lttng_event *event) |
| 213 | { |
| 214 | int ret; |
| 215 | const struct lttng_event_desc *desc; |
| 216 | |
| 217 | assert(event->registered == 0); |
| 218 | desc = event->desc; |
| 219 | ret = __tracepoint_probe_register_queue_release(desc->name, |
| 220 | desc->probe_callback, |
| 221 | event, desc->signature); |
| 222 | WARN_ON_ONCE(ret); |
| 223 | if (!ret) |
| 224 | event->registered = 1; |
| 225 | } |
| 226 | |
| 227 | static |
| 228 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
| 229 | { |
| 230 | int ret; |
| 231 | const struct lttng_event_desc *desc; |
| 232 | |
| 233 | assert(event_notifier->registered == 0); |
| 234 | desc = event_notifier->desc; |
| 235 | ret = __tracepoint_probe_register_queue_release(desc->name, |
| 236 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); |
| 237 | WARN_ON_ONCE(ret); |
| 238 | if (!ret) |
| 239 | event_notifier->registered = 1; |
| 240 | } |
| 241 | |
| 242 | static |
| 243 | void unregister_event(struct lttng_event *event) |
| 244 | { |
| 245 | int ret; |
| 246 | const struct lttng_event_desc *desc; |
| 247 | |
| 248 | assert(event->registered == 1); |
| 249 | desc = event->desc; |
| 250 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
| 251 | desc->probe_callback, |
| 252 | event); |
| 253 | WARN_ON_ONCE(ret); |
| 254 | if (!ret) |
| 255 | event->registered = 0; |
| 256 | } |
| 257 | |
| 258 | static |
| 259 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) |
| 260 | { |
| 261 | int ret; |
| 262 | const struct lttng_event_desc *desc; |
| 263 | |
| 264 | assert(event_notifier->registered == 1); |
| 265 | desc = event_notifier->desc; |
| 266 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
| 267 | desc->u.ext.event_notifier_callback, event_notifier); |
| 268 | WARN_ON_ONCE(ret); |
| 269 | if (!ret) |
| 270 | event_notifier->registered = 0; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Only used internally at session destruction. |
| 275 | */ |
| 276 | static |
| 277 | void _lttng_event_unregister(struct lttng_event *event) |
| 278 | { |
| 279 | if (event->registered) |
| 280 | unregister_event(event); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Only used internally at session destruction. |
| 285 | */ |
| 286 | static |
| 287 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) |
| 288 | { |
| 289 | if (event_notifier->registered) |
| 290 | unregister_event_notifier(event_notifier); |
| 291 | } |
| 292 | |
| 293 | void lttng_session_destroy(struct lttng_session *session) |
| 294 | { |
| 295 | struct lttng_channel *chan, *tmpchan; |
| 296 | struct lttng_event *event, *tmpevent; |
| 297 | struct lttng_enum *_enum, *tmp_enum; |
| 298 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
| 299 | |
| 300 | CMM_ACCESS_ONCE(session->active) = 0; |
| 301 | cds_list_for_each_entry(event, &session->events_head, node) { |
| 302 | _lttng_event_unregister(event); |
| 303 | } |
| 304 | synchronize_trace(); /* Wait for in-flight events to complete */ |
| 305 | __tracepoint_probe_prune_release_queue(); |
| 306 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
| 307 | &session->enablers_head, node) |
| 308 | lttng_event_enabler_destroy(event_enabler); |
| 309 | cds_list_for_each_entry_safe(event, tmpevent, |
| 310 | &session->events_head, node) |
| 311 | _lttng_event_destroy(event); |
| 312 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
| 313 | &session->enums_head, node) |
| 314 | _lttng_enum_destroy(_enum); |
| 315 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
| 316 | _lttng_channel_unmap(chan); |
| 317 | cds_list_del(&session->node); |
| 318 | lttng_destroy_context(session->ctx); |
| 319 | free(session); |
| 320 | } |
| 321 | |
| 322 | void lttng_event_notifier_group_destroy( |
| 323 | struct lttng_event_notifier_group *event_notifier_group) |
| 324 | { |
| 325 | int close_ret; |
| 326 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; |
| 327 | struct lttng_event_notifier *notifier, *tmpnotifier; |
| 328 | |
| 329 | if (!event_notifier_group) { |
| 330 | return; |
| 331 | } |
| 332 | |
| 333 | cds_list_for_each_entry(notifier, |
| 334 | &event_notifier_group->event_notifiers_head, node) |
| 335 | _lttng_event_notifier_unregister(notifier); |
| 336 | |
| 337 | synchronize_trace(); |
| 338 | |
| 339 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, |
| 340 | &event_notifier_group->enablers_head, node) |
| 341 | lttng_event_notifier_enabler_destroy(notifier_enabler); |
| 342 | |
| 343 | cds_list_for_each_entry_safe(notifier, tmpnotifier, |
| 344 | &event_notifier_group->event_notifiers_head, node) |
| 345 | _lttng_event_notifier_destroy(notifier); |
| 346 | |
| 347 | /* Close the notification fd to the listener of event notifiers. */ |
| 348 | |
| 349 | lttng_ust_lock_fd_tracker(); |
| 350 | close_ret = close(event_notifier_group->notification_fd); |
| 351 | if (!close_ret) { |
| 352 | lttng_ust_delete_fd_from_tracker( |
| 353 | event_notifier_group->notification_fd); |
| 354 | } else { |
| 355 | PERROR("close"); |
| 356 | abort(); |
| 357 | } |
| 358 | lttng_ust_unlock_fd_tracker(); |
| 359 | |
| 360 | cds_list_del(&event_notifier_group->node); |
| 361 | |
| 362 | free(event_notifier_group); |
| 363 | } |
| 364 | |
| 365 | static |
| 366 | void lttng_enabler_destroy(struct lttng_enabler *enabler) |
| 367 | { |
| 368 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
| 369 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
| 370 | |
| 371 | if (!enabler) { |
| 372 | return; |
| 373 | } |
| 374 | |
| 375 | /* Destroy filter bytecode */ |
| 376 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, |
| 377 | &enabler->filter_bytecode_head, node) { |
| 378 | free(filter_node); |
| 379 | } |
| 380 | |
| 381 | /* Destroy excluders */ |
| 382 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, |
| 383 | &enabler->excluder_head, node) { |
| 384 | free(excluder_node); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
| 389 | { |
| 390 | if (!event_notifier_enabler) { |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | cds_list_del(&event_notifier_enabler->node); |
| 395 | |
| 396 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
| 397 | |
| 398 | free(event_notifier_enabler); |
| 399 | } |
| 400 | |
| 401 | static |
| 402 | int lttng_enum_create(const struct lttng_enum_desc *desc, |
| 403 | struct lttng_session *session) |
| 404 | { |
| 405 | const char *enum_name = desc->name; |
| 406 | struct lttng_enum *_enum; |
| 407 | struct cds_hlist_head *head; |
| 408 | int ret = 0; |
| 409 | size_t name_len = strlen(enum_name); |
| 410 | uint32_t hash; |
| 411 | int notify_socket; |
| 412 | |
| 413 | /* Check if this enum is already registered for this session. */ |
| 414 | hash = jhash(enum_name, name_len, 0); |
| 415 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; |
| 416 | |
| 417 | _enum = lttng_ust_enum_get_from_desc(session, desc); |
| 418 | if (_enum) { |
| 419 | ret = -EEXIST; |
| 420 | goto exist; |
| 421 | } |
| 422 | |
| 423 | notify_socket = lttng_get_notify_socket(session->owner); |
| 424 | if (notify_socket < 0) { |
| 425 | ret = notify_socket; |
| 426 | goto socket_error; |
| 427 | } |
| 428 | |
| 429 | _enum = zmalloc(sizeof(*_enum)); |
| 430 | if (!_enum) { |
| 431 | ret = -ENOMEM; |
| 432 | goto cache_error; |
| 433 | } |
| 434 | _enum->session = session; |
| 435 | _enum->desc = desc; |
| 436 | |
| 437 | ret = ustcomm_register_enum(notify_socket, |
| 438 | session->objd, |
| 439 | enum_name, |
| 440 | desc->nr_entries, |
| 441 | desc->entries, |
| 442 | &_enum->id); |
| 443 | if (ret < 0) { |
| 444 | DBG("Error (%d) registering enumeration to sessiond", ret); |
| 445 | goto sessiond_register_error; |
| 446 | } |
| 447 | cds_list_add(&_enum->node, &session->enums_head); |
| 448 | cds_hlist_add_head(&_enum->hlist, head); |
| 449 | return 0; |
| 450 | |
| 451 | sessiond_register_error: |
| 452 | free(_enum); |
| 453 | cache_error: |
| 454 | socket_error: |
| 455 | exist: |
| 456 | return ret; |
| 457 | } |
| 458 | |
| 459 | static |
| 460 | int lttng_create_enum_check(const struct lttng_type *type, |
| 461 | struct lttng_session *session) |
| 462 | { |
| 463 | switch (type->atype) { |
| 464 | case atype_enum: |
| 465 | { |
| 466 | const struct lttng_enum_desc *enum_desc; |
| 467 | int ret; |
| 468 | |
| 469 | enum_desc = type->u.legacy.basic.enumeration.desc; |
| 470 | ret = lttng_enum_create(enum_desc, session); |
| 471 | if (ret && ret != -EEXIST) { |
| 472 | DBG("Unable to create enum error: (%d)", ret); |
| 473 | return ret; |
| 474 | } |
| 475 | break; |
| 476 | } |
| 477 | case atype_enum_nestable: |
| 478 | { |
| 479 | const struct lttng_enum_desc *enum_desc; |
| 480 | int ret; |
| 481 | |
| 482 | enum_desc = type->u.enum_nestable.desc; |
| 483 | ret = lttng_enum_create(enum_desc, session); |
| 484 | if (ret && ret != -EEXIST) { |
| 485 | DBG("Unable to create enum error: (%d)", ret); |
| 486 | return ret; |
| 487 | } |
| 488 | break; |
| 489 | } |
| 490 | case atype_dynamic: |
| 491 | { |
| 492 | const struct lttng_event_field *tag_field_generic; |
| 493 | const struct lttng_enum_desc *enum_desc; |
| 494 | int ret; |
| 495 | |
| 496 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); |
| 497 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
| 498 | ret = lttng_enum_create(enum_desc, session); |
| 499 | if (ret && ret != -EEXIST) { |
| 500 | DBG("Unable to create enum error: (%d)", ret); |
| 501 | return ret; |
| 502 | } |
| 503 | break; |
| 504 | } |
| 505 | default: |
| 506 | /* TODO: nested types when they become supported. */ |
| 507 | break; |
| 508 | } |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | static |
| 513 | int lttng_create_all_event_enums(size_t nr_fields, |
| 514 | const struct lttng_event_field *event_fields, |
| 515 | struct lttng_session *session) |
| 516 | { |
| 517 | size_t i; |
| 518 | int ret; |
| 519 | |
| 520 | /* For each field, ensure enum is part of the session. */ |
| 521 | for (i = 0; i < nr_fields; i++) { |
| 522 | const struct lttng_type *type = &event_fields[i].type; |
| 523 | |
| 524 | ret = lttng_create_enum_check(type, session); |
| 525 | if (ret) |
| 526 | return ret; |
| 527 | } |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static |
| 532 | int lttng_create_all_ctx_enums(size_t nr_fields, |
| 533 | const struct lttng_ctx_field *ctx_fields, |
| 534 | struct lttng_session *session) |
| 535 | { |
| 536 | size_t i; |
| 537 | int ret; |
| 538 | |
| 539 | /* For each field, ensure enum is part of the session. */ |
| 540 | for (i = 0; i < nr_fields; i++) { |
| 541 | const struct lttng_type *type = &ctx_fields[i].event_field.type; |
| 542 | |
| 543 | ret = lttng_create_enum_check(type, session); |
| 544 | if (ret) |
| 545 | return ret; |
| 546 | } |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * Ensure that a state-dump will be performed for this session at the end |
| 552 | * of the current handle_message(). |
| 553 | */ |
| 554 | int lttng_session_statedump(struct lttng_session *session) |
| 555 | { |
| 556 | session->statedump_pending = 1; |
| 557 | lttng_ust_sockinfo_session_enabled(session->owner); |
| 558 | return 0; |
| 559 | } |
| 560 | |
| 561 | int lttng_session_enable(struct lttng_session *session) |
| 562 | { |
| 563 | int ret = 0; |
| 564 | struct lttng_channel *chan; |
| 565 | int notify_socket; |
| 566 | |
| 567 | if (session->active) { |
| 568 | ret = -EBUSY; |
| 569 | goto end; |
| 570 | } |
| 571 | |
| 572 | notify_socket = lttng_get_notify_socket(session->owner); |
| 573 | if (notify_socket < 0) |
| 574 | return notify_socket; |
| 575 | |
| 576 | /* Set transient enabler state to "enabled" */ |
| 577 | session->tstate = 1; |
| 578 | |
| 579 | /* We need to sync enablers with session before activation. */ |
| 580 | lttng_session_sync_event_enablers(session); |
| 581 | |
| 582 | /* |
| 583 | * Snapshot the number of events per channel to know the type of header |
| 584 | * we need to use. |
| 585 | */ |
| 586 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
| 587 | const struct lttng_ctx *ctx; |
| 588 | const struct lttng_ctx_field *fields = NULL; |
| 589 | size_t nr_fields = 0; |
| 590 | uint32_t chan_id; |
| 591 | |
| 592 | /* don't change it if session stop/restart */ |
| 593 | if (chan->header_type) |
| 594 | continue; |
| 595 | ctx = chan->ctx; |
| 596 | if (ctx) { |
| 597 | nr_fields = ctx->nr_fields; |
| 598 | fields = ctx->fields; |
| 599 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
| 600 | session); |
| 601 | if (ret < 0) { |
| 602 | DBG("Error (%d) adding enum to session", ret); |
| 603 | return ret; |
| 604 | } |
| 605 | } |
| 606 | ret = ustcomm_register_channel(notify_socket, |
| 607 | session, |
| 608 | session->objd, |
| 609 | chan->objd, |
| 610 | nr_fields, |
| 611 | fields, |
| 612 | &chan_id, |
| 613 | &chan->header_type); |
| 614 | if (ret) { |
| 615 | DBG("Error (%d) registering channel to sessiond", ret); |
| 616 | return ret; |
| 617 | } |
| 618 | if (chan_id != chan->id) { |
| 619 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", |
| 620 | chan_id, chan->id); |
| 621 | return -EINVAL; |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | /* Set atomically the state to "active" */ |
| 626 | CMM_ACCESS_ONCE(session->active) = 1; |
| 627 | CMM_ACCESS_ONCE(session->been_active) = 1; |
| 628 | |
| 629 | ret = lttng_session_statedump(session); |
| 630 | if (ret) |
| 631 | return ret; |
| 632 | end: |
| 633 | return ret; |
| 634 | } |
| 635 | |
| 636 | int lttng_session_disable(struct lttng_session *session) |
| 637 | { |
| 638 | int ret = 0; |
| 639 | |
| 640 | if (!session->active) { |
| 641 | ret = -EBUSY; |
| 642 | goto end; |
| 643 | } |
| 644 | /* Set atomically the state to "inactive" */ |
| 645 | CMM_ACCESS_ONCE(session->active) = 0; |
| 646 | |
| 647 | /* Set transient enabler state to "disabled" */ |
| 648 | session->tstate = 0; |
| 649 | lttng_session_sync_event_enablers(session); |
| 650 | end: |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | int lttng_channel_enable(struct lttng_channel *channel) |
| 655 | { |
| 656 | int ret = 0; |
| 657 | |
| 658 | if (channel->enabled) { |
| 659 | ret = -EBUSY; |
| 660 | goto end; |
| 661 | } |
| 662 | /* Set transient enabler state to "enabled" */ |
| 663 | channel->tstate = 1; |
| 664 | lttng_session_sync_event_enablers(channel->session); |
| 665 | /* Set atomically the state to "enabled" */ |
| 666 | CMM_ACCESS_ONCE(channel->enabled) = 1; |
| 667 | end: |
| 668 | return ret; |
| 669 | } |
| 670 | |
| 671 | int lttng_channel_disable(struct lttng_channel *channel) |
| 672 | { |
| 673 | int ret = 0; |
| 674 | |
| 675 | if (!channel->enabled) { |
| 676 | ret = -EBUSY; |
| 677 | goto end; |
| 678 | } |
| 679 | /* Set atomically the state to "disabled" */ |
| 680 | CMM_ACCESS_ONCE(channel->enabled) = 0; |
| 681 | /* Set transient enabler state to "enabled" */ |
| 682 | channel->tstate = 0; |
| 683 | lttng_session_sync_event_enablers(channel->session); |
| 684 | end: |
| 685 | return ret; |
| 686 | } |
| 687 | |
| 688 | static inline |
| 689 | struct cds_hlist_head *borrow_hash_table_bucket( |
| 690 | struct cds_hlist_head *hash_table, |
| 691 | unsigned int hash_table_size, |
| 692 | const struct lttng_event_desc *desc) |
| 693 | { |
| 694 | const char *event_name; |
| 695 | size_t name_len; |
| 696 | uint32_t hash; |
| 697 | |
| 698 | event_name = desc->name; |
| 699 | name_len = strlen(event_name); |
| 700 | |
| 701 | hash = jhash(event_name, name_len, 0); |
| 702 | return &hash_table[hash & (hash_table_size - 1)]; |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Supports event creation while tracing session is active. |
| 707 | */ |
| 708 | static |
| 709 | int lttng_event_create(const struct lttng_event_desc *desc, |
| 710 | struct lttng_channel *chan) |
| 711 | { |
| 712 | struct lttng_event *event; |
| 713 | struct lttng_session *session = chan->session; |
| 714 | struct cds_hlist_head *head; |
| 715 | int ret = 0; |
| 716 | int notify_socket, loglevel; |
| 717 | const char *uri; |
| 718 | |
| 719 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
| 720 | LTTNG_UST_EVENT_HT_SIZE, desc); |
| 721 | |
| 722 | notify_socket = lttng_get_notify_socket(session->owner); |
| 723 | if (notify_socket < 0) { |
| 724 | ret = notify_socket; |
| 725 | goto socket_error; |
| 726 | } |
| 727 | |
| 728 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
| 729 | session); |
| 730 | if (ret < 0) { |
| 731 | DBG("Error (%d) adding enum to session", ret); |
| 732 | goto create_enum_error; |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * Check if loglevel match. Refuse to connect event if not. |
| 737 | */ |
| 738 | event = zmalloc(sizeof(struct lttng_event)); |
| 739 | if (!event) { |
| 740 | ret = -ENOMEM; |
| 741 | goto cache_error; |
| 742 | } |
| 743 | event->chan = chan; |
| 744 | |
| 745 | /* Event will be enabled by enabler sync. */ |
| 746 | event->enabled = 0; |
| 747 | event->registered = 0; |
| 748 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
| 749 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
| 750 | event->desc = desc; |
| 751 | |
| 752 | if (desc->loglevel) |
| 753 | loglevel = *(*event->desc->loglevel); |
| 754 | else |
| 755 | loglevel = TRACE_DEFAULT; |
| 756 | if (desc->u.ext.model_emf_uri) |
| 757 | uri = *(desc->u.ext.model_emf_uri); |
| 758 | else |
| 759 | uri = NULL; |
| 760 | |
| 761 | /* Fetch event ID from sessiond */ |
| 762 | ret = ustcomm_register_event(notify_socket, |
| 763 | session, |
| 764 | session->objd, |
| 765 | chan->objd, |
| 766 | desc->name, |
| 767 | loglevel, |
| 768 | desc->signature, |
| 769 | desc->nr_fields, |
| 770 | desc->fields, |
| 771 | uri, |
| 772 | &event->id); |
| 773 | if (ret < 0) { |
| 774 | DBG("Error (%d) registering event to sessiond", ret); |
| 775 | goto sessiond_register_error; |
| 776 | } |
| 777 | |
| 778 | cds_list_add(&event->node, &chan->session->events_head); |
| 779 | cds_hlist_add_head(&event->hlist, head); |
| 780 | return 0; |
| 781 | |
| 782 | sessiond_register_error: |
| 783 | free(event); |
| 784 | cache_error: |
| 785 | create_enum_error: |
| 786 | socket_error: |
| 787 | return ret; |
| 788 | } |
| 789 | |
| 790 | static |
| 791 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, |
| 792 | uint64_t token, |
| 793 | struct lttng_event_notifier_group *event_notifier_group) |
| 794 | { |
| 795 | struct lttng_event_notifier *event_notifier; |
| 796 | struct cds_hlist_head *head; |
| 797 | int ret = 0; |
| 798 | |
| 799 | /* |
| 800 | * Get the hashtable bucket the created lttng_event_notifier object |
| 801 | * should be inserted. |
| 802 | */ |
| 803 | head = borrow_hash_table_bucket( |
| 804 | event_notifier_group->event_notifiers_ht.table, |
| 805 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); |
| 806 | |
| 807 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); |
| 808 | if (!event_notifier) { |
| 809 | ret = -ENOMEM; |
| 810 | goto error; |
| 811 | } |
| 812 | |
| 813 | event_notifier->group = event_notifier_group; |
| 814 | event_notifier->user_token = token; |
| 815 | |
| 816 | /* Event notifier will be enabled by enabler sync. */ |
| 817 | event_notifier->enabled = 0; |
| 818 | event_notifier->registered = 0; |
| 819 | |
| 820 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
| 821 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
| 822 | event_notifier->desc = desc; |
| 823 | |
| 824 | cds_list_add(&event_notifier->node, |
| 825 | &event_notifier_group->event_notifiers_head); |
| 826 | cds_hlist_add_head(&event_notifier->hlist, head); |
| 827 | |
| 828 | return 0; |
| 829 | |
| 830 | error: |
| 831 | return ret; |
| 832 | } |
| 833 | |
| 834 | static |
| 835 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) |
| 836 | { |
| 837 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
| 838 | |
| 839 | /* Remove from event_notifier list. */ |
| 840 | cds_list_del(&event_notifier->node); |
| 841 | /* Remove from event_notifier hash table. */ |
| 842 | cds_hlist_del(&event_notifier->hlist); |
| 843 | |
| 844 | lttng_free_event_notifier_filter_runtime(event_notifier); |
| 845 | |
| 846 | /* Free event_notifier enabler refs */ |
| 847 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, |
| 848 | &event_notifier->enablers_ref_head, node) |
| 849 | free(enabler_ref); |
| 850 | free(event_notifier); |
| 851 | } |
| 852 | |
| 853 | static |
| 854 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
| 855 | struct lttng_enabler *enabler) |
| 856 | { |
| 857 | int loglevel = 0; |
| 858 | unsigned int has_loglevel = 0; |
| 859 | |
| 860 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
| 861 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
| 862 | desc->name, SIZE_MAX)) |
| 863 | return 0; |
| 864 | if (desc->loglevel) { |
| 865 | loglevel = *(*desc->loglevel); |
| 866 | has_loglevel = 1; |
| 867 | } |
| 868 | if (!lttng_loglevel_match(loglevel, |
| 869 | has_loglevel, |
| 870 | enabler->event_param.loglevel_type, |
| 871 | enabler->event_param.loglevel)) |
| 872 | return 0; |
| 873 | return 1; |
| 874 | } |
| 875 | |
| 876 | static |
| 877 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, |
| 878 | struct lttng_enabler *enabler) |
| 879 | { |
| 880 | int loglevel = 0; |
| 881 | unsigned int has_loglevel = 0; |
| 882 | |
| 883 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
| 884 | if (strcmp(desc->name, enabler->event_param.name)) |
| 885 | return 0; |
| 886 | if (desc->loglevel) { |
| 887 | loglevel = *(*desc->loglevel); |
| 888 | has_loglevel = 1; |
| 889 | } |
| 890 | if (!lttng_loglevel_match(loglevel, |
| 891 | has_loglevel, |
| 892 | enabler->event_param.loglevel_type, |
| 893 | enabler->event_param.loglevel)) |
| 894 | return 0; |
| 895 | return 1; |
| 896 | } |
| 897 | |
| 898 | static |
| 899 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
| 900 | struct lttng_enabler *enabler) |
| 901 | { |
| 902 | switch (enabler->format_type) { |
| 903 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: |
| 904 | { |
| 905 | struct lttng_ust_excluder_node *excluder; |
| 906 | |
| 907 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * If the matching event matches with an excluder, |
| 913 | * return 'does not match' |
| 914 | */ |
| 915 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { |
| 916 | int count; |
| 917 | |
| 918 | for (count = 0; count < excluder->excluder.count; count++) { |
| 919 | int len; |
| 920 | char *excluder_name; |
| 921 | |
| 922 | excluder_name = (char *) (excluder->excluder.names) |
| 923 | + count * LTTNG_UST_SYM_NAME_LEN; |
| 924 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); |
| 925 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
| 926 | return 0; |
| 927 | } |
| 928 | } |
| 929 | return 1; |
| 930 | } |
| 931 | case LTTNG_ENABLER_FORMAT_EVENT: |
| 932 | return lttng_desc_match_event_enabler(desc, enabler); |
| 933 | default: |
| 934 | return -EINVAL; |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | static |
| 939 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
| 940 | struct lttng_event *event) |
| 941 | { |
| 942 | if (lttng_desc_match_enabler(event->desc, |
| 943 | lttng_event_enabler_as_enabler(event_enabler)) |
| 944 | && event->chan == event_enabler->chan) |
| 945 | return 1; |
| 946 | else |
| 947 | return 0; |
| 948 | } |
| 949 | |
| 950 | static |
| 951 | int lttng_event_notifier_enabler_match_event_notifier( |
| 952 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
| 953 | struct lttng_event_notifier *event_notifier) |
| 954 | { |
| 955 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, |
| 956 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
| 957 | |
| 958 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && |
| 959 | event_notifier->user_token == event_notifier_enabler->user_token) |
| 960 | return 1; |
| 961 | else |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | static |
| 966 | struct lttng_enabler_ref *lttng_enabler_ref( |
| 967 | struct cds_list_head *enabler_ref_list, |
| 968 | struct lttng_enabler *enabler) |
| 969 | { |
| 970 | struct lttng_enabler_ref *enabler_ref; |
| 971 | |
| 972 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
| 973 | if (enabler_ref->ref == enabler) |
| 974 | return enabler_ref; |
| 975 | } |
| 976 | return NULL; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Create struct lttng_event if it is missing and present in the list of |
| 981 | * tracepoint probes. |
| 982 | */ |
| 983 | static |
| 984 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
| 985 | { |
| 986 | struct lttng_session *session = event_enabler->chan->session; |
| 987 | struct lttng_probe_desc *probe_desc; |
| 988 | const struct lttng_event_desc *desc; |
| 989 | struct lttng_event *event; |
| 990 | int i; |
| 991 | struct cds_list_head *probe_list; |
| 992 | |
| 993 | probe_list = lttng_get_probe_list_head(); |
| 994 | /* |
| 995 | * For each probe event, if we find that a probe event matches |
| 996 | * our enabler, create an associated lttng_event if not |
| 997 | * already present. |
| 998 | */ |
| 999 | cds_list_for_each_entry(probe_desc, probe_list, head) { |
| 1000 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 1001 | int ret; |
| 1002 | bool found = false; |
| 1003 | struct cds_hlist_head *head; |
| 1004 | struct cds_hlist_node *node; |
| 1005 | |
| 1006 | desc = probe_desc->event_desc[i]; |
| 1007 | if (!lttng_desc_match_enabler(desc, |
| 1008 | lttng_event_enabler_as_enabler(event_enabler))) |
| 1009 | continue; |
| 1010 | |
| 1011 | head = borrow_hash_table_bucket( |
| 1012 | session->events_ht.table, |
| 1013 | LTTNG_UST_EVENT_HT_SIZE, desc); |
| 1014 | |
| 1015 | cds_hlist_for_each_entry(event, node, head, hlist) { |
| 1016 | if (event->desc == desc |
| 1017 | && event->chan == event_enabler->chan) { |
| 1018 | found = true; |
| 1019 | break; |
| 1020 | } |
| 1021 | } |
| 1022 | if (found) |
| 1023 | continue; |
| 1024 | |
| 1025 | /* |
| 1026 | * We need to create an event for this |
| 1027 | * event probe. |
| 1028 | */ |
| 1029 | ret = lttng_event_create(probe_desc->event_desc[i], |
| 1030 | event_enabler->chan); |
| 1031 | if (ret) { |
| 1032 | DBG("Unable to create event %s, error %d\n", |
| 1033 | probe_desc->event_desc[i]->name, ret); |
| 1034 | } |
| 1035 | } |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | static |
| 1040 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, |
| 1041 | void (*event_func)(struct lttng_session *session, |
| 1042 | struct lttng_event *event), |
| 1043 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) |
| 1044 | { |
| 1045 | struct cds_hlist_node *node, *tmp_node; |
| 1046 | struct cds_list_head *sessionsp; |
| 1047 | unsigned int i; |
| 1048 | |
| 1049 | /* Get handle on list of sessions. */ |
| 1050 | sessionsp = _lttng_get_sessions(); |
| 1051 | |
| 1052 | /* |
| 1053 | * Iterate over all events in the probe provider descriptions and |
| 1054 | * sessions to queue the unregistration of the events. |
| 1055 | */ |
| 1056 | for (i = 0; i < provider_desc->nr_events; i++) { |
| 1057 | const struct lttng_event_desc *event_desc; |
| 1058 | struct lttng_event_notifier_group *event_notifier_group; |
| 1059 | struct lttng_event_notifier *event_notifier; |
| 1060 | struct lttng_session *session; |
| 1061 | struct cds_hlist_head *head; |
| 1062 | struct lttng_event *event; |
| 1063 | |
| 1064 | event_desc = provider_desc->event_desc[i]; |
| 1065 | |
| 1066 | /* |
| 1067 | * Iterate over all session to find the current event |
| 1068 | * description. |
| 1069 | */ |
| 1070 | cds_list_for_each_entry(session, sessionsp, node) { |
| 1071 | /* |
| 1072 | * Get the list of events in the hashtable bucket and |
| 1073 | * iterate to find the event matching this descriptor. |
| 1074 | */ |
| 1075 | head = borrow_hash_table_bucket( |
| 1076 | session->events_ht.table, |
| 1077 | LTTNG_UST_EVENT_HT_SIZE, event_desc); |
| 1078 | |
| 1079 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
| 1080 | if (event_desc == event->desc) { |
| 1081 | event_func(session, event); |
| 1082 | break; |
| 1083 | } |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | /* |
| 1088 | * Iterate over all event_notifier groups to find the current event |
| 1089 | * description. |
| 1090 | */ |
| 1091 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { |
| 1092 | /* |
| 1093 | * Get the list of event_notifiers in the hashtable bucket and |
| 1094 | * iterate to find the event_notifier matching this |
| 1095 | * descriptor. |
| 1096 | */ |
| 1097 | head = borrow_hash_table_bucket( |
| 1098 | event_notifier_group->event_notifiers_ht.table, |
| 1099 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); |
| 1100 | |
| 1101 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { |
| 1102 | if (event_desc == event_notifier->desc) { |
| 1103 | event_notifier_func(event_notifier); |
| 1104 | break; |
| 1105 | } |
| 1106 | } |
| 1107 | } |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | static |
| 1112 | void _unregister_event(struct lttng_session *session, |
| 1113 | struct lttng_event *event) |
| 1114 | { |
| 1115 | _lttng_event_unregister(event); |
| 1116 | } |
| 1117 | |
| 1118 | static |
| 1119 | void _event_enum_destroy(struct lttng_session *session, |
| 1120 | struct lttng_event *event) |
| 1121 | { |
| 1122 | unsigned int i; |
| 1123 | |
| 1124 | /* Destroy enums of the current event. */ |
| 1125 | for (i = 0; i < event->desc->nr_fields; i++) { |
| 1126 | const struct lttng_enum_desc *enum_desc; |
| 1127 | const struct lttng_event_field *field; |
| 1128 | struct lttng_enum *curr_enum; |
| 1129 | |
| 1130 | field = &(event->desc->fields[i]); |
| 1131 | switch (field->type.atype) { |
| 1132 | case atype_enum: |
| 1133 | enum_desc = field->type.u.legacy.basic.enumeration.desc; |
| 1134 | break; |
| 1135 | case atype_enum_nestable: |
| 1136 | enum_desc = field->type.u.enum_nestable.desc; |
| 1137 | break; |
| 1138 | default: |
| 1139 | continue; |
| 1140 | } |
| 1141 | |
| 1142 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); |
| 1143 | if (curr_enum) { |
| 1144 | _lttng_enum_destroy(curr_enum); |
| 1145 | } |
| 1146 | } |
| 1147 | |
| 1148 | /* Destroy event. */ |
| 1149 | _lttng_event_destroy(event); |
| 1150 | } |
| 1151 | |
| 1152 | /* |
| 1153 | * Iterate over all the UST sessions to unregister and destroy all probes from |
| 1154 | * the probe provider descriptor received as argument. Must me called with the |
| 1155 | * ust_lock held. |
| 1156 | */ |
| 1157 | void lttng_probe_provider_unregister_events( |
| 1158 | struct lttng_probe_desc *provider_desc) |
| 1159 | { |
| 1160 | /* |
| 1161 | * Iterate over all events in the probe provider descriptions and sessions |
| 1162 | * to queue the unregistration of the events. |
| 1163 | */ |
| 1164 | probe_provider_event_for_each(provider_desc, _unregister_event, |
| 1165 | _lttng_event_notifier_unregister); |
| 1166 | |
| 1167 | /* Wait for grace period. */ |
| 1168 | synchronize_trace(); |
| 1169 | /* Prune the unregistration queue. */ |
| 1170 | __tracepoint_probe_prune_release_queue(); |
| 1171 | |
| 1172 | /* |
| 1173 | * It is now safe to destroy the events and remove them from the event list |
| 1174 | * and hashtables. |
| 1175 | */ |
| 1176 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
| 1177 | _lttng_event_notifier_destroy); |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * Create events associated with an event enabler (if not already present), |
| 1182 | * and add backward reference from the event to the enabler. |
| 1183 | */ |
| 1184 | static |
| 1185 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
| 1186 | { |
| 1187 | struct lttng_session *session = event_enabler->chan->session; |
| 1188 | struct lttng_event *event; |
| 1189 | |
| 1190 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
| 1191 | goto end; |
| 1192 | |
| 1193 | /* First ensure that probe events are created for this enabler. */ |
| 1194 | lttng_create_event_if_missing(event_enabler); |
| 1195 | |
| 1196 | /* For each event matching enabler in session event list. */ |
| 1197 | cds_list_for_each_entry(event, &session->events_head, node) { |
| 1198 | struct lttng_enabler_ref *enabler_ref; |
| 1199 | |
| 1200 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
| 1201 | continue; |
| 1202 | |
| 1203 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
| 1204 | lttng_event_enabler_as_enabler(event_enabler)); |
| 1205 | if (!enabler_ref) { |
| 1206 | /* |
| 1207 | * If no backward ref, create it. |
| 1208 | * Add backward ref from event to enabler. |
| 1209 | */ |
| 1210 | enabler_ref = zmalloc(sizeof(*enabler_ref)); |
| 1211 | if (!enabler_ref) |
| 1212 | return -ENOMEM; |
| 1213 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
| 1214 | event_enabler); |
| 1215 | cds_list_add(&enabler_ref->node, |
| 1216 | &event->enablers_ref_head); |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * Link filter bytecodes if not linked yet. |
| 1221 | */ |
| 1222 | lttng_enabler_link_bytecode(event->desc, |
| 1223 | &session->ctx, |
| 1224 | &event->filter_bytecode_runtime_head, |
| 1225 | lttng_event_enabler_as_enabler(event_enabler)); |
| 1226 | |
| 1227 | /* TODO: merge event context. */ |
| 1228 | } |
| 1229 | end: |
| 1230 | return 0; |
| 1231 | } |
| 1232 | |
| 1233 | /* |
| 1234 | * Called at library load: connect the probe on all enablers matching |
| 1235 | * this event. |
| 1236 | * Called with session mutex held. |
| 1237 | */ |
| 1238 | int lttng_fix_pending_events(void) |
| 1239 | { |
| 1240 | struct lttng_session *session; |
| 1241 | |
| 1242 | cds_list_for_each_entry(session, &sessions, node) { |
| 1243 | lttng_session_lazy_sync_event_enablers(session); |
| 1244 | } |
| 1245 | return 0; |
| 1246 | } |
| 1247 | |
| 1248 | int lttng_fix_pending_event_notifiers(void) |
| 1249 | { |
| 1250 | struct lttng_event_notifier_group *event_notifier_group; |
| 1251 | |
| 1252 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { |
| 1253 | lttng_event_notifier_group_sync_enablers(event_notifier_group); |
| 1254 | } |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | * For each session of the owner thread, execute pending statedump. |
| 1260 | * Only dump state for the sessions owned by the caller thread, because |
| 1261 | * we don't keep ust_lock across the entire iteration. |
| 1262 | */ |
| 1263 | void lttng_handle_pending_statedump(void *owner) |
| 1264 | { |
| 1265 | struct lttng_session *session; |
| 1266 | |
| 1267 | /* Execute state dump */ |
| 1268 | do_lttng_ust_statedump(owner); |
| 1269 | |
| 1270 | /* Clear pending state dump */ |
| 1271 | if (ust_lock()) { |
| 1272 | goto end; |
| 1273 | } |
| 1274 | cds_list_for_each_entry(session, &sessions, node) { |
| 1275 | if (session->owner != owner) |
| 1276 | continue; |
| 1277 | if (!session->statedump_pending) |
| 1278 | continue; |
| 1279 | session->statedump_pending = 0; |
| 1280 | } |
| 1281 | end: |
| 1282 | ust_unlock(); |
| 1283 | return; |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Only used internally at session destruction. |
| 1288 | */ |
| 1289 | static |
| 1290 | void _lttng_event_destroy(struct lttng_event *event) |
| 1291 | { |
| 1292 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
| 1293 | |
| 1294 | /* Remove from event list. */ |
| 1295 | cds_list_del(&event->node); |
| 1296 | /* Remove from event hash table. */ |
| 1297 | cds_hlist_del(&event->hlist); |
| 1298 | |
| 1299 | lttng_destroy_context(event->ctx); |
| 1300 | lttng_free_event_filter_runtime(event); |
| 1301 | /* Free event enabler refs */ |
| 1302 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, |
| 1303 | &event->enablers_ref_head, node) |
| 1304 | free(enabler_ref); |
| 1305 | free(event); |
| 1306 | } |
| 1307 | |
| 1308 | static |
| 1309 | void _lttng_enum_destroy(struct lttng_enum *_enum) |
| 1310 | { |
| 1311 | cds_list_del(&_enum->node); |
| 1312 | cds_hlist_del(&_enum->hlist); |
| 1313 | free(_enum); |
| 1314 | } |
| 1315 | |
| 1316 | void lttng_ust_events_exit(void) |
| 1317 | { |
| 1318 | struct lttng_session *session, *tmpsession; |
| 1319 | |
| 1320 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
| 1321 | lttng_session_destroy(session); |
| 1322 | } |
| 1323 | |
| 1324 | /* |
| 1325 | * Enabler management. |
| 1326 | */ |
| 1327 | struct lttng_event_enabler *lttng_event_enabler_create( |
| 1328 | enum lttng_enabler_format_type format_type, |
| 1329 | struct lttng_ust_event *event_param, |
| 1330 | struct lttng_channel *chan) |
| 1331 | { |
| 1332 | struct lttng_event_enabler *event_enabler; |
| 1333 | |
| 1334 | event_enabler = zmalloc(sizeof(*event_enabler)); |
| 1335 | if (!event_enabler) |
| 1336 | return NULL; |
| 1337 | event_enabler->base.format_type = format_type; |
| 1338 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); |
| 1339 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); |
| 1340 | memcpy(&event_enabler->base.event_param, event_param, |
| 1341 | sizeof(event_enabler->base.event_param)); |
| 1342 | event_enabler->chan = chan; |
| 1343 | /* ctx left NULL */ |
| 1344 | event_enabler->base.enabled = 0; |
| 1345 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
| 1346 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
| 1347 | |
| 1348 | return event_enabler; |
| 1349 | } |
| 1350 | |
| 1351 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
| 1352 | struct lttng_event_notifier_group *event_notifier_group, |
| 1353 | enum lttng_enabler_format_type format_type, |
| 1354 | struct lttng_ust_event_notifier *event_notifier_param) |
| 1355 | { |
| 1356 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
| 1357 | |
| 1358 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); |
| 1359 | if (!event_notifier_enabler) |
| 1360 | return NULL; |
| 1361 | event_notifier_enabler->base.format_type = format_type; |
| 1362 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); |
| 1363 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
| 1364 | |
| 1365 | event_notifier_enabler->user_token = event_notifier_param->event.token; |
| 1366 | |
| 1367 | memcpy(&event_notifier_enabler->base.event_param.name, |
| 1368 | event_notifier_param->event.name, |
| 1369 | sizeof(event_notifier_enabler->base.event_param.name)); |
| 1370 | event_notifier_enabler->base.event_param.instrumentation = |
| 1371 | event_notifier_param->event.instrumentation; |
| 1372 | event_notifier_enabler->base.event_param.loglevel = |
| 1373 | event_notifier_param->event.loglevel; |
| 1374 | event_notifier_enabler->base.event_param.loglevel_type = |
| 1375 | event_notifier_param->event.loglevel_type; |
| 1376 | |
| 1377 | event_notifier_enabler->base.enabled = 0; |
| 1378 | event_notifier_enabler->group = event_notifier_group; |
| 1379 | |
| 1380 | cds_list_add(&event_notifier_enabler->node, |
| 1381 | &event_notifier_group->enablers_head); |
| 1382 | |
| 1383 | lttng_event_notifier_group_sync_enablers(event_notifier_group); |
| 1384 | |
| 1385 | return event_notifier_enabler; |
| 1386 | } |
| 1387 | |
| 1388 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
| 1389 | { |
| 1390 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
| 1391 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
| 1392 | |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
| 1397 | { |
| 1398 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
| 1399 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
| 1400 | |
| 1401 | return 0; |
| 1402 | } |
| 1403 | |
| 1404 | static |
| 1405 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
| 1406 | struct lttng_ust_bytecode_node *bytecode) |
| 1407 | { |
| 1408 | bytecode->enabler = enabler; |
| 1409 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); |
| 1410 | } |
| 1411 | |
| 1412 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
| 1413 | struct lttng_ust_bytecode_node *bytecode) |
| 1414 | { |
| 1415 | _lttng_enabler_attach_filter_bytecode( |
| 1416 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
| 1417 | |
| 1418 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | static |
| 1423 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, |
| 1424 | struct lttng_ust_excluder_node *excluder) |
| 1425 | { |
| 1426 | excluder->enabler = enabler; |
| 1427 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); |
| 1428 | } |
| 1429 | |
| 1430 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, |
| 1431 | struct lttng_ust_excluder_node *excluder) |
| 1432 | { |
| 1433 | _lttng_enabler_attach_exclusion( |
| 1434 | lttng_event_enabler_as_enabler(event_enabler), excluder); |
| 1435 | |
| 1436 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
| 1437 | return 0; |
| 1438 | } |
| 1439 | |
| 1440 | int lttng_event_notifier_enabler_enable( |
| 1441 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
| 1442 | { |
| 1443 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; |
| 1444 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
| 1445 | |
| 1446 | return 0; |
| 1447 | } |
| 1448 | |
| 1449 | int lttng_event_notifier_enabler_disable( |
| 1450 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
| 1451 | { |
| 1452 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; |
| 1453 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
| 1454 | |
| 1455 | return 0; |
| 1456 | } |
| 1457 | |
| 1458 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
| 1459 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
| 1460 | struct lttng_ust_bytecode_node *bytecode) |
| 1461 | { |
| 1462 | _lttng_enabler_attach_filter_bytecode( |
| 1463 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
| 1464 | bytecode); |
| 1465 | |
| 1466 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
| 1467 | return 0; |
| 1468 | } |
| 1469 | |
| 1470 | int lttng_event_notifier_enabler_attach_exclusion( |
| 1471 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
| 1472 | struct lttng_ust_excluder_node *excluder) |
| 1473 | { |
| 1474 | _lttng_enabler_attach_exclusion( |
| 1475 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
| 1476 | excluder); |
| 1477 | |
| 1478 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
| 1479 | return 0; |
| 1480 | } |
| 1481 | |
| 1482 | int lttng_attach_context(struct lttng_ust_context *context_param, |
| 1483 | union ust_args *uargs, |
| 1484 | struct lttng_ctx **ctx, struct lttng_session *session) |
| 1485 | { |
| 1486 | /* |
| 1487 | * We cannot attach a context after trace has been started for a |
| 1488 | * session because the metadata does not allow expressing this |
| 1489 | * information outside of the original channel scope. |
| 1490 | */ |
| 1491 | if (session->been_active) |
| 1492 | return -EPERM; |
| 1493 | |
| 1494 | switch (context_param->ctx) { |
| 1495 | case LTTNG_UST_CONTEXT_PTHREAD_ID: |
| 1496 | return lttng_add_pthread_id_to_ctx(ctx); |
| 1497 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
| 1498 | { |
| 1499 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; |
| 1500 | |
| 1501 | perf_ctx_param = &context_param->u.perf_counter; |
| 1502 | return lttng_add_perf_counter_to_ctx( |
| 1503 | perf_ctx_param->type, |
| 1504 | perf_ctx_param->config, |
| 1505 | perf_ctx_param->name, |
| 1506 | ctx); |
| 1507 | } |
| 1508 | case LTTNG_UST_CONTEXT_VTID: |
| 1509 | return lttng_add_vtid_to_ctx(ctx); |
| 1510 | case LTTNG_UST_CONTEXT_VPID: |
| 1511 | return lttng_add_vpid_to_ctx(ctx); |
| 1512 | case LTTNG_UST_CONTEXT_PROCNAME: |
| 1513 | return lttng_add_procname_to_ctx(ctx); |
| 1514 | case LTTNG_UST_CONTEXT_IP: |
| 1515 | return lttng_add_ip_to_ctx(ctx); |
| 1516 | case LTTNG_UST_CONTEXT_CPU_ID: |
| 1517 | return lttng_add_cpu_id_to_ctx(ctx); |
| 1518 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
| 1519 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, |
| 1520 | ctx); |
| 1521 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
| 1522 | return lttng_add_cgroup_ns_to_ctx(ctx); |
| 1523 | case LTTNG_UST_CONTEXT_IPC_NS: |
| 1524 | return lttng_add_ipc_ns_to_ctx(ctx); |
| 1525 | case LTTNG_UST_CONTEXT_MNT_NS: |
| 1526 | return lttng_add_mnt_ns_to_ctx(ctx); |
| 1527 | case LTTNG_UST_CONTEXT_NET_NS: |
| 1528 | return lttng_add_net_ns_to_ctx(ctx); |
| 1529 | case LTTNG_UST_CONTEXT_PID_NS: |
| 1530 | return lttng_add_pid_ns_to_ctx(ctx); |
| 1531 | case LTTNG_UST_CONTEXT_TIME_NS: |
| 1532 | return lttng_add_time_ns_to_ctx(ctx); |
| 1533 | case LTTNG_UST_CONTEXT_USER_NS: |
| 1534 | return lttng_add_user_ns_to_ctx(ctx); |
| 1535 | case LTTNG_UST_CONTEXT_UTS_NS: |
| 1536 | return lttng_add_uts_ns_to_ctx(ctx); |
| 1537 | case LTTNG_UST_CONTEXT_VUID: |
| 1538 | return lttng_add_vuid_to_ctx(ctx); |
| 1539 | case LTTNG_UST_CONTEXT_VEUID: |
| 1540 | return lttng_add_veuid_to_ctx(ctx); |
| 1541 | case LTTNG_UST_CONTEXT_VSUID: |
| 1542 | return lttng_add_vsuid_to_ctx(ctx); |
| 1543 | case LTTNG_UST_CONTEXT_VGID: |
| 1544 | return lttng_add_vgid_to_ctx(ctx); |
| 1545 | case LTTNG_UST_CONTEXT_VEGID: |
| 1546 | return lttng_add_vegid_to_ctx(ctx); |
| 1547 | case LTTNG_UST_CONTEXT_VSGID: |
| 1548 | return lttng_add_vsgid_to_ctx(ctx); |
| 1549 | default: |
| 1550 | return -EINVAL; |
| 1551 | } |
| 1552 | } |
| 1553 | |
| 1554 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
| 1555 | struct lttng_ust_context *context_param) |
| 1556 | { |
| 1557 | return -ENOSYS; |
| 1558 | } |
| 1559 | |
| 1560 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
| 1561 | { |
| 1562 | if (!event_enabler) { |
| 1563 | return; |
| 1564 | } |
| 1565 | cds_list_del(&event_enabler->node); |
| 1566 | |
| 1567 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
| 1568 | |
| 1569 | lttng_destroy_context(event_enabler->ctx); |
| 1570 | free(event_enabler); |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * lttng_session_sync_event_enablers should be called just before starting a |
| 1575 | * session. |
| 1576 | */ |
| 1577 | static |
| 1578 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
| 1579 | { |
| 1580 | struct lttng_event_enabler *event_enabler; |
| 1581 | struct lttng_event *event; |
| 1582 | |
| 1583 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
| 1584 | lttng_event_enabler_ref_events(event_enabler); |
| 1585 | /* |
| 1586 | * For each event, if at least one of its enablers is enabled, |
| 1587 | * and its channel and session transient states are enabled, we |
| 1588 | * enable the event, else we disable it. |
| 1589 | */ |
| 1590 | cds_list_for_each_entry(event, &session->events_head, node) { |
| 1591 | struct lttng_enabler_ref *enabler_ref; |
| 1592 | struct lttng_bytecode_runtime *runtime; |
| 1593 | int enabled = 0, has_enablers_without_bytecode = 0; |
| 1594 | |
| 1595 | /* Enable events */ |
| 1596 | cds_list_for_each_entry(enabler_ref, |
| 1597 | &event->enablers_ref_head, node) { |
| 1598 | if (enabler_ref->ref->enabled) { |
| 1599 | enabled = 1; |
| 1600 | break; |
| 1601 | } |
| 1602 | } |
| 1603 | /* |
| 1604 | * Enabled state is based on union of enablers, with |
| 1605 | * intesection of session and channel transient enable |
| 1606 | * states. |
| 1607 | */ |
| 1608 | enabled = enabled && session->tstate && event->chan->tstate; |
| 1609 | |
| 1610 | CMM_STORE_SHARED(event->enabled, enabled); |
| 1611 | /* |
| 1612 | * Sync tracepoint registration with event enabled |
| 1613 | * state. |
| 1614 | */ |
| 1615 | if (enabled) { |
| 1616 | if (!event->registered) |
| 1617 | register_event(event); |
| 1618 | } else { |
| 1619 | if (event->registered) |
| 1620 | unregister_event(event); |
| 1621 | } |
| 1622 | |
| 1623 | /* Check if has enablers without bytecode enabled */ |
| 1624 | cds_list_for_each_entry(enabler_ref, |
| 1625 | &event->enablers_ref_head, node) { |
| 1626 | if (enabler_ref->ref->enabled |
| 1627 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { |
| 1628 | has_enablers_without_bytecode = 1; |
| 1629 | break; |
| 1630 | } |
| 1631 | } |
| 1632 | event->has_enablers_without_bytecode = |
| 1633 | has_enablers_without_bytecode; |
| 1634 | |
| 1635 | /* Enable filters */ |
| 1636 | cds_list_for_each_entry(runtime, |
| 1637 | &event->filter_bytecode_runtime_head, node) { |
| 1638 | lttng_filter_sync_state(runtime); |
| 1639 | } |
| 1640 | } |
| 1641 | __tracepoint_probe_prune_release_queue(); |
| 1642 | } |
| 1643 | |
| 1644 | static |
| 1645 | void lttng_create_event_notifier_if_missing( |
| 1646 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
| 1647 | { |
| 1648 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; |
| 1649 | struct lttng_probe_desc *probe_desc; |
| 1650 | struct cds_list_head *probe_list; |
| 1651 | int i; |
| 1652 | |
| 1653 | probe_list = lttng_get_probe_list_head(); |
| 1654 | |
| 1655 | cds_list_for_each_entry(probe_desc, probe_list, head) { |
| 1656 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 1657 | int ret; |
| 1658 | bool found = false; |
| 1659 | const struct lttng_event_desc *desc; |
| 1660 | struct lttng_event_notifier *event_notifier; |
| 1661 | struct cds_hlist_head *head; |
| 1662 | struct cds_hlist_node *node; |
| 1663 | |
| 1664 | desc = probe_desc->event_desc[i]; |
| 1665 | if (!lttng_desc_match_enabler(desc, |
| 1666 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) |
| 1667 | continue; |
| 1668 | |
| 1669 | /* |
| 1670 | * Given the current event_notifier group, get the bucket that |
| 1671 | * the target event_notifier would be if it was already |
| 1672 | * created. |
| 1673 | */ |
| 1674 | head = borrow_hash_table_bucket( |
| 1675 | event_notifier_group->event_notifiers_ht.table, |
| 1676 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); |
| 1677 | |
| 1678 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { |
| 1679 | /* |
| 1680 | * Check if event_notifier already exists by checking |
| 1681 | * if the event_notifier and enabler share the same |
| 1682 | * description and id. |
| 1683 | */ |
| 1684 | if (event_notifier->desc == desc && |
| 1685 | event_notifier->user_token == event_notifier_enabler->user_token) { |
| 1686 | found = true; |
| 1687 | break; |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | if (found) |
| 1692 | continue; |
| 1693 | |
| 1694 | /* |
| 1695 | * We need to create a event_notifier for this event probe. |
| 1696 | */ |
| 1697 | ret = lttng_event_notifier_create(desc, |
| 1698 | event_notifier_enabler->user_token, |
| 1699 | event_notifier_group); |
| 1700 | if (ret) { |
| 1701 | DBG("Unable to create event_notifier %s, error %d\n", |
| 1702 | probe_desc->event_desc[i]->name, ret); |
| 1703 | } |
| 1704 | } |
| 1705 | } |
| 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | * Create event_notifiers associated with a event_notifier enabler (if not already present). |
| 1710 | */ |
| 1711 | static |
| 1712 | int lttng_event_notifier_enabler_ref_event_notifiers( |
| 1713 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
| 1714 | { |
| 1715 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; |
| 1716 | struct lttng_event_notifier *event_notifier; |
| 1717 | |
| 1718 | /* |
| 1719 | * Only try to create event_notifiers for enablers that are enabled, the user |
| 1720 | * might still be attaching filter or exclusion to the |
| 1721 | * event_notifier_enabler. |
| 1722 | */ |
| 1723 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) |
| 1724 | goto end; |
| 1725 | |
| 1726 | /* First, ensure that probe event_notifiers are created for this enabler. */ |
| 1727 | lttng_create_event_notifier_if_missing(event_notifier_enabler); |
| 1728 | |
| 1729 | /* Link the created event_notifier with its associated enabler. */ |
| 1730 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { |
| 1731 | struct lttng_enabler_ref *enabler_ref; |
| 1732 | |
| 1733 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) |
| 1734 | continue; |
| 1735 | |
| 1736 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, |
| 1737 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
| 1738 | if (!enabler_ref) { |
| 1739 | /* |
| 1740 | * If no backward ref, create it. |
| 1741 | * Add backward ref from event_notifier to enabler. |
| 1742 | */ |
| 1743 | enabler_ref = zmalloc(sizeof(*enabler_ref)); |
| 1744 | if (!enabler_ref) |
| 1745 | return -ENOMEM; |
| 1746 | |
| 1747 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( |
| 1748 | event_notifier_enabler); |
| 1749 | cds_list_add(&enabler_ref->node, |
| 1750 | &event_notifier->enablers_ref_head); |
| 1751 | } |
| 1752 | |
| 1753 | /* |
| 1754 | * Link filter bytecodes if not linked yet. |
| 1755 | */ |
| 1756 | lttng_enabler_link_bytecode(event_notifier->desc, |
| 1757 | &event_notifier_group->ctx, &event_notifier->filter_bytecode_runtime_head, |
| 1758 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
| 1759 | } |
| 1760 | end: |
| 1761 | return 0; |
| 1762 | } |
| 1763 | |
| 1764 | static |
| 1765 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) |
| 1766 | { |
| 1767 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
| 1768 | struct lttng_event_notifier *event_notifier; |
| 1769 | |
| 1770 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) |
| 1771 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); |
| 1772 | |
| 1773 | /* |
| 1774 | * For each event_notifier, if at least one of its enablers is enabled, |
| 1775 | * we enable the event_notifier, else we disable it. |
| 1776 | */ |
| 1777 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { |
| 1778 | struct lttng_enabler_ref *enabler_ref; |
| 1779 | struct lttng_bytecode_runtime *runtime; |
| 1780 | int enabled = 0, has_enablers_without_bytecode = 0; |
| 1781 | |
| 1782 | /* Enable event_notifiers */ |
| 1783 | cds_list_for_each_entry(enabler_ref, |
| 1784 | &event_notifier->enablers_ref_head, node) { |
| 1785 | if (enabler_ref->ref->enabled) { |
| 1786 | enabled = 1; |
| 1787 | break; |
| 1788 | } |
| 1789 | } |
| 1790 | |
| 1791 | CMM_STORE_SHARED(event_notifier->enabled, enabled); |
| 1792 | /* |
| 1793 | * Sync tracepoint registration with event_notifier enabled |
| 1794 | * state. |
| 1795 | */ |
| 1796 | if (enabled) { |
| 1797 | if (!event_notifier->registered) |
| 1798 | register_event_notifier(event_notifier); |
| 1799 | } else { |
| 1800 | if (event_notifier->registered) |
| 1801 | unregister_event_notifier(event_notifier); |
| 1802 | } |
| 1803 | |
| 1804 | /* Check if has enablers without bytecode enabled */ |
| 1805 | cds_list_for_each_entry(enabler_ref, |
| 1806 | &event_notifier->enablers_ref_head, node) { |
| 1807 | if (enabler_ref->ref->enabled |
| 1808 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { |
| 1809 | has_enablers_without_bytecode = 1; |
| 1810 | break; |
| 1811 | } |
| 1812 | } |
| 1813 | event_notifier->has_enablers_without_bytecode = |
| 1814 | has_enablers_without_bytecode; |
| 1815 | |
| 1816 | /* Enable filters */ |
| 1817 | cds_list_for_each_entry(runtime, |
| 1818 | &event_notifier->filter_bytecode_runtime_head, node) { |
| 1819 | lttng_filter_sync_state(runtime); |
| 1820 | } |
| 1821 | } |
| 1822 | __tracepoint_probe_prune_release_queue(); |
| 1823 | } |
| 1824 | |
| 1825 | /* |
| 1826 | * Apply enablers to session events, adding events to session if need |
| 1827 | * be. It is required after each modification applied to an active |
| 1828 | * session, and right before session "start". |
| 1829 | * "lazy" sync means we only sync if required. |
| 1830 | */ |
| 1831 | static |
| 1832 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
| 1833 | { |
| 1834 | /* We can skip if session is not active */ |
| 1835 | if (!session->active) |
| 1836 | return; |
| 1837 | lttng_session_sync_event_enablers(session); |
| 1838 | } |
| 1839 | |
| 1840 | /* |
| 1841 | * Update all sessions with the given app context. |
| 1842 | * Called with ust lock held. |
| 1843 | * This is invoked when an application context gets loaded/unloaded. It |
| 1844 | * ensures the context callbacks are in sync with the application |
| 1845 | * context (either app context callbacks, or dummy callbacks). |
| 1846 | */ |
| 1847 | void lttng_ust_context_set_session_provider(const char *name, |
| 1848 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), |
| 1849 | void (*record)(struct lttng_ctx_field *field, |
| 1850 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
| 1851 | struct lttng_channel *chan), |
| 1852 | void (*get_value)(struct lttng_ctx_field *field, |
| 1853 | struct lttng_ctx_value *value)) |
| 1854 | { |
| 1855 | struct lttng_session *session; |
| 1856 | |
| 1857 | cds_list_for_each_entry(session, &sessions, node) { |
| 1858 | struct lttng_channel *chan; |
| 1859 | struct lttng_event *event; |
| 1860 | int ret; |
| 1861 | |
| 1862 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, |
| 1863 | name, get_size, record, get_value); |
| 1864 | if (ret) |
| 1865 | abort(); |
| 1866 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
| 1867 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, |
| 1868 | name, get_size, record, get_value); |
| 1869 | if (ret) |
| 1870 | abort(); |
| 1871 | } |
| 1872 | cds_list_for_each_entry(event, &session->events_head, node) { |
| 1873 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, |
| 1874 | name, get_size, record, get_value); |
| 1875 | if (ret) |
| 1876 | abort(); |
| 1877 | } |
| 1878 | } |
| 1879 | } |
| 1880 | |
| 1881 | /* |
| 1882 | * Update all event_notifier groups with the given app context. |
| 1883 | * Called with ust lock held. |
| 1884 | * This is invoked when an application context gets loaded/unloaded. It |
| 1885 | * ensures the context callbacks are in sync with the application |
| 1886 | * context (either app context callbacks, or dummy callbacks). |
| 1887 | */ |
| 1888 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, |
| 1889 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), |
| 1890 | void (*record)(struct lttng_ctx_field *field, |
| 1891 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
| 1892 | struct lttng_channel *chan), |
| 1893 | void (*get_value)(struct lttng_ctx_field *field, |
| 1894 | struct lttng_ctx_value *value)) |
| 1895 | { |
| 1896 | struct lttng_event_notifier_group *event_notifier_group; |
| 1897 | |
| 1898 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { |
| 1899 | int ret; |
| 1900 | |
| 1901 | ret = lttng_ust_context_set_provider_rcu( |
| 1902 | &event_notifier_group->ctx, |
| 1903 | name, get_size, record, get_value); |
| 1904 | if (ret) |
| 1905 | abort(); |
| 1906 | } |
| 1907 | } |