| 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 | #define _LGPL_SOURCE |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <inttypes.h> |
| 25 | |
| 26 | #include <common/common.h> |
| 27 | #include <common/defaults.h> |
| 28 | |
| 29 | #include "buffer-registry.h" |
| 30 | #include "trace-ust.h" |
| 31 | #include "utils.h" |
| 32 | #include "ust-app.h" |
| 33 | |
| 34 | /* |
| 35 | * Match function for the events hash table lookup. |
| 36 | * |
| 37 | * Matches by name only. Used by the disable command. |
| 38 | */ |
| 39 | int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node, |
| 40 | const void *_key) |
| 41 | { |
| 42 | struct ltt_ust_event *event; |
| 43 | const char *name; |
| 44 | |
| 45 | assert(node); |
| 46 | assert(_key); |
| 47 | |
| 48 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 49 | name = _key; |
| 50 | |
| 51 | /* Event name */ |
| 52 | if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) { |
| 53 | goto no_match; |
| 54 | } |
| 55 | |
| 56 | /* Match */ |
| 57 | return 1; |
| 58 | |
| 59 | no_match: |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Match function for the hash table lookup. |
| 65 | * |
| 66 | * It matches an ust event based on three attributes which are the event name, |
| 67 | * the filter bytecode and the loglevel. |
| 68 | */ |
| 69 | int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key) |
| 70 | { |
| 71 | struct ltt_ust_event *event; |
| 72 | const struct ltt_ust_ht_key *key; |
| 73 | |
| 74 | assert(node); |
| 75 | assert(_key); |
| 76 | |
| 77 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 78 | key = _key; |
| 79 | |
| 80 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */ |
| 81 | |
| 82 | /* Event name */ |
| 83 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { |
| 84 | goto no_match; |
| 85 | } |
| 86 | |
| 87 | /* Event loglevel. */ |
| 88 | if (event->attr.loglevel != key->loglevel) { |
| 89 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
| 90 | && key->loglevel == 0 && event->attr.loglevel == -1) { |
| 91 | /* |
| 92 | * Match is accepted. This is because on event creation, the |
| 93 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and |
| 94 | * -1 are accepted for this loglevel type since 0 is the one set by |
| 95 | * the API when receiving an enable event. |
| 96 | */ |
| 97 | } else { |
| 98 | goto no_match; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* Only one of the filters is NULL, fail. */ |
| 103 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { |
| 104 | goto no_match; |
| 105 | } |
| 106 | |
| 107 | if (key->filter && event->filter) { |
| 108 | /* Both filters exists, check length followed by the bytecode. */ |
| 109 | if (event->filter->len != key->filter->len || |
| 110 | memcmp(event->filter->data, key->filter->data, |
| 111 | event->filter->len) != 0) { |
| 112 | goto no_match; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | /* If only one of the exclusions is NULL, fail. */ |
| 117 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { |
| 118 | goto no_match; |
| 119 | } |
| 120 | |
| 121 | if (key->exclusion && event->exclusion) { |
| 122 | /* Both exclusions exist; check count followed by names. */ |
| 123 | if (event->exclusion->count != key->exclusion->count || |
| 124 | memcmp(event->exclusion->names, key->exclusion->names, |
| 125 | event->exclusion->count * LTTNG_SYMBOL_NAME_LEN) != 0) { |
| 126 | goto no_match; |
| 127 | } |
| 128 | } |
| 129 | /* Match. */ |
| 130 | return 1; |
| 131 | |
| 132 | no_match: |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Find the channel in the hashtable and return channel pointer. RCU read side |
| 138 | * lock MUST be acquired before calling this. |
| 139 | */ |
| 140 | struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht, |
| 141 | char *name) |
| 142 | { |
| 143 | struct lttng_ht_node_str *node; |
| 144 | struct lttng_ht_iter iter; |
| 145 | |
| 146 | /* |
| 147 | * If we receive an empty string for channel name, it means the |
| 148 | * default channel name is requested. |
| 149 | */ |
| 150 | if (name[0] == '\0') |
| 151 | name = DEFAULT_CHANNEL_NAME; |
| 152 | |
| 153 | lttng_ht_lookup(ht, (void *)name, &iter); |
| 154 | node = lttng_ht_iter_get_node_str(&iter); |
| 155 | if (node == NULL) { |
| 156 | goto error; |
| 157 | } |
| 158 | |
| 159 | DBG2("Trace UST channel %s found by name", name); |
| 160 | |
| 161 | return caa_container_of(node, struct ltt_ust_channel, node); |
| 162 | |
| 163 | error: |
| 164 | DBG2("Trace UST channel %s not found by name", name); |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Find the event in the hashtable and return event pointer. RCU read side lock |
| 170 | * MUST be acquired before calling this. |
| 171 | */ |
| 172 | struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht, |
| 173 | char *name, struct lttng_filter_bytecode *filter, int loglevel, |
| 174 | struct lttng_event_exclusion *exclusion) |
| 175 | { |
| 176 | struct lttng_ht_node_str *node; |
| 177 | struct lttng_ht_iter iter; |
| 178 | struct ltt_ust_ht_key key; |
| 179 | |
| 180 | assert(name); |
| 181 | assert(ht); |
| 182 | |
| 183 | key.name = name; |
| 184 | key.filter = filter; |
| 185 | key.loglevel = loglevel; |
| 186 | key.exclusion = exclusion; |
| 187 | |
| 188 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 189 | trace_ust_ht_match_event, &key, &iter.iter); |
| 190 | node = lttng_ht_iter_get_node_str(&iter); |
| 191 | if (node == NULL) { |
| 192 | goto error; |
| 193 | } |
| 194 | |
| 195 | DBG2("Trace UST event %s found", key.name); |
| 196 | |
| 197 | return caa_container_of(node, struct ltt_ust_event, node); |
| 198 | |
| 199 | error: |
| 200 | DBG2("Trace UST event %s NOT found", key.name); |
| 201 | return NULL; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Lookup an agent in the session agents hash table by domain type and return |
| 206 | * the object if found else NULL. |
| 207 | * |
| 208 | * RCU read side lock must be acquired before calling and only released |
| 209 | * once the agent is no longer in scope or being used. |
| 210 | */ |
| 211 | struct agent *trace_ust_find_agent(struct ltt_ust_session *session, |
| 212 | enum lttng_domain_type domain_type) |
| 213 | { |
| 214 | struct agent *agt = NULL; |
| 215 | struct lttng_ht_node_u64 *node; |
| 216 | struct lttng_ht_iter iter; |
| 217 | uint64_t key; |
| 218 | |
| 219 | assert(session); |
| 220 | |
| 221 | DBG3("Trace ust agent lookup for domain %d", domain_type); |
| 222 | |
| 223 | key = domain_type; |
| 224 | |
| 225 | lttng_ht_lookup(session->agents, &key, &iter); |
| 226 | node = lttng_ht_iter_get_node_u64(&iter); |
| 227 | if (!node) { |
| 228 | goto end; |
| 229 | } |
| 230 | agt = caa_container_of(node, struct agent, node); |
| 231 | |
| 232 | end: |
| 233 | return agt; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Allocate and initialize a ust session data structure. |
| 238 | * |
| 239 | * Return pointer to structure or NULL. |
| 240 | */ |
| 241 | struct ltt_ust_session *trace_ust_create_session(uint64_t session_id) |
| 242 | { |
| 243 | struct ltt_ust_session *lus; |
| 244 | |
| 245 | /* Allocate a new ltt ust session */ |
| 246 | lus = zmalloc(sizeof(struct ltt_ust_session)); |
| 247 | if (lus == NULL) { |
| 248 | PERROR("create ust session zmalloc"); |
| 249 | goto error; |
| 250 | } |
| 251 | |
| 252 | /* Init data structure */ |
| 253 | lus->id = session_id; |
| 254 | lus->active = 0; |
| 255 | |
| 256 | /* Set default metadata channel attribute. */ |
| 257 | lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 258 | lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size(); |
| 259 | lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
| 260 | lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
| 261 | lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; |
| 262 | lus->metadata_attr.output = LTTNG_UST_MMAP; |
| 263 | |
| 264 | /* |
| 265 | * Default buffer type. This can be changed through an enable channel |
| 266 | * requesting a different type. Note that this can only be changed once |
| 267 | * during the session lifetime which is at the first enable channel and |
| 268 | * only before start. The flag buffer_type_changed indicates the status. |
| 269 | */ |
| 270 | lus->buffer_type = LTTNG_BUFFER_PER_UID; |
| 271 | /* Once set to 1, the buffer_type is immutable for the session. */ |
| 272 | lus->buffer_type_changed = 0; |
| 273 | /* Init it in case it get used after allocation. */ |
| 274 | CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list); |
| 275 | |
| 276 | /* Alloc UST global domain channels' HT */ |
| 277 | lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 278 | /* Alloc agent hash table. */ |
| 279 | lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 280 | |
| 281 | lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
| 282 | if (lus->consumer == NULL) { |
| 283 | goto error_consumer; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * The tmp_consumer stays NULL until a set_consumer_uri command is |
| 288 | * executed. At this point, the consumer should be nullify until an |
| 289 | * enable_consumer command. This assignment is symbolic since we've zmalloc |
| 290 | * the struct. |
| 291 | */ |
| 292 | lus->tmp_consumer = NULL; |
| 293 | |
| 294 | DBG2("UST trace session create successful"); |
| 295 | |
| 296 | return lus; |
| 297 | |
| 298 | error_consumer: |
| 299 | ht_cleanup_push(lus->domain_global.channels); |
| 300 | ht_cleanup_push(lus->agents); |
| 301 | free(lus); |
| 302 | error: |
| 303 | return NULL; |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Allocate and initialize a ust channel data structure. |
| 308 | * |
| 309 | * Return pointer to structure or NULL. |
| 310 | */ |
| 311 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan) |
| 312 | { |
| 313 | struct ltt_ust_channel *luc; |
| 314 | |
| 315 | assert(chan); |
| 316 | |
| 317 | luc = zmalloc(sizeof(struct ltt_ust_channel)); |
| 318 | if (luc == NULL) { |
| 319 | PERROR("ltt_ust_channel zmalloc"); |
| 320 | goto error; |
| 321 | } |
| 322 | |
| 323 | /* Copy UST channel attributes */ |
| 324 | luc->attr.overwrite = chan->attr.overwrite; |
| 325 | luc->attr.subbuf_size = chan->attr.subbuf_size; |
| 326 | luc->attr.num_subbuf = chan->attr.num_subbuf; |
| 327 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; |
| 328 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; |
| 329 | luc->attr.output = (enum lttng_ust_output) chan->attr.output; |
| 330 | |
| 331 | /* Translate to UST output enum */ |
| 332 | switch (luc->attr.output) { |
| 333 | default: |
| 334 | luc->attr.output = LTTNG_UST_MMAP; |
| 335 | break; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * If we receive an empty string for channel name, it means the |
| 340 | * default channel name is requested. |
| 341 | */ |
| 342 | if (chan->name[0] == '\0') { |
| 343 | strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name)); |
| 344 | } else { |
| 345 | /* Copy channel name */ |
| 346 | strncpy(luc->name, chan->name, sizeof(luc->name)); |
| 347 | } |
| 348 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 349 | |
| 350 | /* Init node */ |
| 351 | lttng_ht_node_init_str(&luc->node, luc->name); |
| 352 | CDS_INIT_LIST_HEAD(&luc->ctx_list); |
| 353 | |
| 354 | /* Alloc hash tables */ |
| 355 | luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 356 | luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 357 | |
| 358 | /* On-disk circular buffer parameters */ |
| 359 | luc->tracefile_size = chan->attr.tracefile_size; |
| 360 | luc->tracefile_count = chan->attr.tracefile_count; |
| 361 | |
| 362 | DBG2("Trace UST channel %s created", luc->name); |
| 363 | |
| 364 | error: |
| 365 | return luc; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Allocate and initialize a ust event. Set name and event type. |
| 370 | * We own filter_expression, filter, and exclusion. |
| 371 | * |
| 372 | * Return pointer to structure or NULL. |
| 373 | */ |
| 374 | struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev, |
| 375 | char *filter_expression, |
| 376 | struct lttng_filter_bytecode *filter, |
| 377 | struct lttng_event_exclusion *exclusion, |
| 378 | bool internal_event) |
| 379 | { |
| 380 | struct ltt_ust_event *lue; |
| 381 | |
| 382 | assert(ev); |
| 383 | |
| 384 | lue = zmalloc(sizeof(struct ltt_ust_event)); |
| 385 | if (lue == NULL) { |
| 386 | PERROR("ust event zmalloc"); |
| 387 | goto error; |
| 388 | } |
| 389 | |
| 390 | lue->internal = internal_event; |
| 391 | |
| 392 | switch (ev->type) { |
| 393 | case LTTNG_EVENT_PROBE: |
| 394 | lue->attr.instrumentation = LTTNG_UST_PROBE; |
| 395 | break; |
| 396 | case LTTNG_EVENT_FUNCTION: |
| 397 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 398 | break; |
| 399 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 400 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 401 | break; |
| 402 | case LTTNG_EVENT_TRACEPOINT: |
| 403 | lue->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
| 404 | break; |
| 405 | default: |
| 406 | ERR("Unknown ust instrumentation type (%d)", ev->type); |
| 407 | goto error_free_event; |
| 408 | } |
| 409 | |
| 410 | /* Copy event name */ |
| 411 | strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
| 412 | lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 413 | |
| 414 | switch (ev->loglevel_type) { |
| 415 | case LTTNG_EVENT_LOGLEVEL_ALL: |
| 416 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL; |
| 417 | lue->attr.loglevel = -1; /* Force to -1 */ |
| 418 | break; |
| 419 | case LTTNG_EVENT_LOGLEVEL_RANGE: |
| 420 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; |
| 421 | lue->attr.loglevel = ev->loglevel; |
| 422 | break; |
| 423 | case LTTNG_EVENT_LOGLEVEL_SINGLE: |
| 424 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; |
| 425 | lue->attr.loglevel = ev->loglevel; |
| 426 | break; |
| 427 | default: |
| 428 | ERR("Unknown ust loglevel type (%d)", ev->loglevel_type); |
| 429 | goto error_free_event; |
| 430 | } |
| 431 | |
| 432 | /* Same layout. */ |
| 433 | lue->filter_expression = filter_expression; |
| 434 | lue->filter = (struct lttng_ust_filter_bytecode *) filter; |
| 435 | lue->exclusion = (struct lttng_event_exclusion *) exclusion; |
| 436 | |
| 437 | /* Init node */ |
| 438 | lttng_ht_node_init_str(&lue->node, lue->attr.name); |
| 439 | |
| 440 | DBG2("Trace UST event %s, loglevel (%d,%d) created", |
| 441 | lue->attr.name, lue->attr.loglevel_type, |
| 442 | lue->attr.loglevel); |
| 443 | |
| 444 | return lue; |
| 445 | |
| 446 | error_free_event: |
| 447 | free(lue); |
| 448 | error: |
| 449 | free(filter_expression); |
| 450 | free(filter); |
| 451 | free(exclusion); |
| 452 | return NULL; |
| 453 | } |
| 454 | |
| 455 | static |
| 456 | int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type) |
| 457 | { |
| 458 | int utype; |
| 459 | |
| 460 | switch (type) { |
| 461 | case LTTNG_EVENT_CONTEXT_VTID: |
| 462 | utype = LTTNG_UST_CONTEXT_VTID; |
| 463 | break; |
| 464 | case LTTNG_EVENT_CONTEXT_VPID: |
| 465 | utype = LTTNG_UST_CONTEXT_VPID; |
| 466 | break; |
| 467 | case LTTNG_EVENT_CONTEXT_PTHREAD_ID: |
| 468 | utype = LTTNG_UST_CONTEXT_PTHREAD_ID; |
| 469 | break; |
| 470 | case LTTNG_EVENT_CONTEXT_PROCNAME: |
| 471 | utype = LTTNG_UST_CONTEXT_PROCNAME; |
| 472 | break; |
| 473 | case LTTNG_EVENT_CONTEXT_IP: |
| 474 | utype = LTTNG_UST_CONTEXT_IP; |
| 475 | break; |
| 476 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 477 | if (!ustctl_has_perf_counters()) { |
| 478 | utype = -1; |
| 479 | WARN("Perf counters not implemented in UST"); |
| 480 | } else { |
| 481 | utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER; |
| 482 | } |
| 483 | break; |
| 484 | default: |
| 485 | ERR("Invalid UST context"); |
| 486 | utype = -1; |
| 487 | break; |
| 488 | } |
| 489 | return utype; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Return 1 if contexts match, 0 otherwise. |
| 494 | */ |
| 495 | int trace_ust_match_context(struct ltt_ust_context *uctx, |
| 496 | struct lttng_event_context *ctx) |
| 497 | { |
| 498 | int utype; |
| 499 | |
| 500 | utype = trace_ust_context_type_event_to_ust(ctx->ctx); |
| 501 | if (utype < 0) { |
| 502 | return 0; |
| 503 | } |
| 504 | if (uctx->ctx.ctx != utype) { |
| 505 | return 0; |
| 506 | } |
| 507 | switch (utype) { |
| 508 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
| 509 | if (uctx->ctx.u.perf_counter.type |
| 510 | != ctx->u.perf_counter.type) { |
| 511 | return 0; |
| 512 | } |
| 513 | if (uctx->ctx.u.perf_counter.config |
| 514 | != ctx->u.perf_counter.config) { |
| 515 | return 0; |
| 516 | } |
| 517 | if (strncmp(uctx->ctx.u.perf_counter.name, |
| 518 | ctx->u.perf_counter.name, |
| 519 | LTTNG_UST_SYM_NAME_LEN)) { |
| 520 | return 0; |
| 521 | } |
| 522 | break; |
| 523 | default: |
| 524 | break; |
| 525 | |
| 526 | } |
| 527 | return 1; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Allocate and initialize an UST context. |
| 532 | * |
| 533 | * Return pointer to structure or NULL. |
| 534 | */ |
| 535 | struct ltt_ust_context *trace_ust_create_context( |
| 536 | struct lttng_event_context *ctx) |
| 537 | { |
| 538 | struct ltt_ust_context *uctx; |
| 539 | int utype; |
| 540 | |
| 541 | assert(ctx); |
| 542 | |
| 543 | utype = trace_ust_context_type_event_to_ust(ctx->ctx); |
| 544 | if (utype < 0) { |
| 545 | return NULL; |
| 546 | } |
| 547 | |
| 548 | uctx = zmalloc(sizeof(struct ltt_ust_context)); |
| 549 | if (uctx == NULL) { |
| 550 | PERROR("zmalloc ltt_ust_context"); |
| 551 | goto error; |
| 552 | } |
| 553 | |
| 554 | uctx->ctx.ctx = (enum lttng_ust_context_type) utype; |
| 555 | switch (utype) { |
| 556 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
| 557 | uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type; |
| 558 | uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config; |
| 559 | strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name, |
| 560 | LTTNG_UST_SYM_NAME_LEN); |
| 561 | uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 562 | break; |
| 563 | default: |
| 564 | break; |
| 565 | } |
| 566 | lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx); |
| 567 | |
| 568 | return uctx; |
| 569 | |
| 570 | error: |
| 571 | return NULL; |
| 572 | } |
| 573 | |
| 574 | static |
| 575 | void destroy_pid_tracker_node_rcu(struct rcu_head *head) |
| 576 | { |
| 577 | struct ust_pid_tracker_node *tracker_node = |
| 578 | caa_container_of(head, struct ust_pid_tracker_node, node.head); |
| 579 | free(tracker_node); |
| 580 | } |
| 581 | |
| 582 | static |
| 583 | void destroy_pid_tracker_node(struct ust_pid_tracker_node *tracker_node) |
| 584 | { |
| 585 | |
| 586 | call_rcu(&tracker_node->node.head, destroy_pid_tracker_node_rcu); |
| 587 | } |
| 588 | |
| 589 | static |
| 590 | int init_pid_tracker(struct ust_pid_tracker *pid_tracker) |
| 591 | { |
| 592 | int ret = 0; |
| 593 | |
| 594 | pid_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 595 | if (!pid_tracker->ht) { |
| 596 | ret = -1; |
| 597 | goto end; |
| 598 | } |
| 599 | |
| 600 | end: |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Teardown pid tracker content, but don't free pid_tracker object. |
| 606 | */ |
| 607 | static |
| 608 | void fini_pid_tracker(struct ust_pid_tracker *pid_tracker) |
| 609 | { |
| 610 | struct ust_pid_tracker_node *tracker_node; |
| 611 | struct lttng_ht_iter iter; |
| 612 | |
| 613 | if (!pid_tracker->ht) { |
| 614 | return; |
| 615 | } |
| 616 | rcu_read_lock(); |
| 617 | cds_lfht_for_each_entry(pid_tracker->ht->ht, |
| 618 | &iter.iter, tracker_node, node.node) { |
| 619 | int ret = lttng_ht_del(pid_tracker->ht, &iter); |
| 620 | |
| 621 | assert(!ret); |
| 622 | destroy_pid_tracker_node(tracker_node); |
| 623 | } |
| 624 | rcu_read_unlock(); |
| 625 | ht_cleanup_push(pid_tracker->ht); |
| 626 | pid_tracker->ht = NULL; |
| 627 | } |
| 628 | |
| 629 | static |
| 630 | struct ust_pid_tracker_node *pid_tracker_lookup( |
| 631 | struct ust_pid_tracker *pid_tracker, int pid, |
| 632 | struct lttng_ht_iter *iter) |
| 633 | { |
| 634 | unsigned long _pid = (unsigned long) pid; |
| 635 | struct lttng_ht_node_ulong *node; |
| 636 | |
| 637 | lttng_ht_lookup(pid_tracker->ht, (void *) _pid, iter); |
| 638 | node = lttng_ht_iter_get_node_ulong(iter); |
| 639 | if (node) { |
| 640 | return caa_container_of(node, struct ust_pid_tracker_node, |
| 641 | node); |
| 642 | } else { |
| 643 | return NULL; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | static |
| 648 | int pid_tracker_add_pid(struct ust_pid_tracker *pid_tracker, int pid) |
| 649 | { |
| 650 | int retval = LTTNG_OK; |
| 651 | struct ust_pid_tracker_node *tracker_node; |
| 652 | struct lttng_ht_iter iter; |
| 653 | |
| 654 | if (pid < 0) { |
| 655 | retval = LTTNG_ERR_INVALID; |
| 656 | goto end; |
| 657 | } |
| 658 | tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter); |
| 659 | if (tracker_node) { |
| 660 | /* Already exists. */ |
| 661 | retval = LTTNG_ERR_PID_TRACKED; |
| 662 | goto end; |
| 663 | } |
| 664 | tracker_node = zmalloc(sizeof(*tracker_node)); |
| 665 | if (!tracker_node) { |
| 666 | retval = LTTNG_ERR_NOMEM; |
| 667 | goto end; |
| 668 | } |
| 669 | lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) pid); |
| 670 | lttng_ht_add_unique_ulong(pid_tracker->ht, &tracker_node->node); |
| 671 | end: |
| 672 | return retval; |
| 673 | } |
| 674 | |
| 675 | static |
| 676 | int pid_tracker_del_pid(struct ust_pid_tracker *pid_tracker, int pid) |
| 677 | { |
| 678 | int retval = LTTNG_OK, ret; |
| 679 | struct ust_pid_tracker_node *tracker_node; |
| 680 | struct lttng_ht_iter iter; |
| 681 | |
| 682 | if (pid < 0) { |
| 683 | retval = LTTNG_ERR_INVALID; |
| 684 | goto end; |
| 685 | } |
| 686 | tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter); |
| 687 | if (!tracker_node) { |
| 688 | /* Not found */ |
| 689 | retval = LTTNG_ERR_PID_NOT_TRACKED; |
| 690 | goto end; |
| 691 | } |
| 692 | ret = lttng_ht_del(pid_tracker->ht, &iter); |
| 693 | assert(!ret); |
| 694 | |
| 695 | destroy_pid_tracker_node(tracker_node); |
| 696 | end: |
| 697 | return retval; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * The session lock is held when calling this function. |
| 702 | */ |
| 703 | int trace_ust_pid_tracker_lookup(struct ltt_ust_session *session, int pid) |
| 704 | { |
| 705 | struct lttng_ht_iter iter; |
| 706 | |
| 707 | if (!session->pid_tracker.ht) { |
| 708 | return 1; |
| 709 | } |
| 710 | if (pid_tracker_lookup(&session->pid_tracker, pid, &iter)) { |
| 711 | return 1; |
| 712 | } |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * Called with the session lock held. |
| 718 | */ |
| 719 | int trace_ust_track_pid(struct ltt_ust_session *session, int pid) |
| 720 | { |
| 721 | int retval = LTTNG_OK; |
| 722 | |
| 723 | if (pid == -1) { |
| 724 | /* Track all pids: destroy tracker if exists. */ |
| 725 | if (session->pid_tracker.ht) { |
| 726 | fini_pid_tracker(&session->pid_tracker); |
| 727 | /* Ensure all apps have session. */ |
| 728 | ust_app_global_update_all(session); |
| 729 | } |
| 730 | } else { |
| 731 | int ret; |
| 732 | |
| 733 | if (!session->pid_tracker.ht) { |
| 734 | /* Create tracker. */ |
| 735 | if (init_pid_tracker(&session->pid_tracker)) { |
| 736 | ERR("Error initializing PID tracker"); |
| 737 | retval = LTTNG_ERR_NOMEM; |
| 738 | goto end; |
| 739 | } |
| 740 | ret = pid_tracker_add_pid(&session->pid_tracker, pid); |
| 741 | if (ret != LTTNG_OK) { |
| 742 | retval = ret; |
| 743 | fini_pid_tracker(&session->pid_tracker); |
| 744 | goto end; |
| 745 | } |
| 746 | /* Remove all apps from session except pid. */ |
| 747 | ust_app_global_update_all(session); |
| 748 | } else { |
| 749 | struct ust_app *app; |
| 750 | |
| 751 | ret = pid_tracker_add_pid(&session->pid_tracker, pid); |
| 752 | if (ret != LTTNG_OK) { |
| 753 | retval = ret; |
| 754 | goto end; |
| 755 | } |
| 756 | /* Add session to application */ |
| 757 | app = ust_app_find_by_pid(pid); |
| 758 | if (app) { |
| 759 | ust_app_global_update(session, app); |
| 760 | } |
| 761 | } |
| 762 | } |
| 763 | end: |
| 764 | return retval; |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | * Called with the session lock held. |
| 769 | */ |
| 770 | int trace_ust_untrack_pid(struct ltt_ust_session *session, int pid) |
| 771 | { |
| 772 | int retval = LTTNG_OK; |
| 773 | |
| 774 | if (pid == -1) { |
| 775 | /* Create empty tracker, replace old tracker. */ |
| 776 | struct ust_pid_tracker tmp_tracker; |
| 777 | |
| 778 | tmp_tracker = session->pid_tracker; |
| 779 | if (init_pid_tracker(&session->pid_tracker)) { |
| 780 | ERR("Error initializing PID tracker"); |
| 781 | retval = LTTNG_ERR_NOMEM; |
| 782 | /* Rollback operation. */ |
| 783 | session->pid_tracker = tmp_tracker; |
| 784 | goto end; |
| 785 | } |
| 786 | fini_pid_tracker(&tmp_tracker); |
| 787 | |
| 788 | /* Remove session from all applications */ |
| 789 | ust_app_global_update_all(session); |
| 790 | } else { |
| 791 | int ret; |
| 792 | struct ust_app *app; |
| 793 | |
| 794 | if (!session->pid_tracker.ht) { |
| 795 | retval = LTTNG_ERR_INVALID; |
| 796 | goto end; |
| 797 | } |
| 798 | /* Remove PID from tracker */ |
| 799 | ret = pid_tracker_del_pid(&session->pid_tracker, pid); |
| 800 | if (ret != LTTNG_OK) { |
| 801 | retval = ret; |
| 802 | goto end; |
| 803 | } |
| 804 | /* Remove session from application. */ |
| 805 | app = ust_app_find_by_pid(pid); |
| 806 | if (app) { |
| 807 | ust_app_global_update(session, app); |
| 808 | } |
| 809 | } |
| 810 | end: |
| 811 | return retval; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Called with session lock held. |
| 816 | */ |
| 817 | ssize_t trace_ust_list_tracker_pids(struct ltt_ust_session *session, |
| 818 | int32_t **_pids) |
| 819 | { |
| 820 | struct ust_pid_tracker_node *tracker_node; |
| 821 | struct lttng_ht_iter iter; |
| 822 | unsigned long count, i = 0; |
| 823 | long approx[2]; |
| 824 | int32_t *pids; |
| 825 | int ret = 0; |
| 826 | |
| 827 | if (!session->pid_tracker.ht) { |
| 828 | /* Tracker disabled. Set first entry to -1. */ |
| 829 | pids = zmalloc(sizeof(*pids)); |
| 830 | if (!pids) { |
| 831 | ret = -1; |
| 832 | goto end; |
| 833 | } |
| 834 | pids[0] = -1; |
| 835 | *_pids = pids; |
| 836 | return 1; |
| 837 | } |
| 838 | |
| 839 | rcu_read_lock(); |
| 840 | cds_lfht_count_nodes(session->pid_tracker.ht->ht, |
| 841 | &approx[0], &count, &approx[1]); |
| 842 | pids = zmalloc(sizeof(*pids) * count); |
| 843 | if (!pids) { |
| 844 | ret = -1; |
| 845 | goto end; |
| 846 | } |
| 847 | cds_lfht_for_each_entry(session->pid_tracker.ht->ht, |
| 848 | &iter.iter, tracker_node, node.node) { |
| 849 | pids[i++] = tracker_node->node.key; |
| 850 | } |
| 851 | *_pids = pids; |
| 852 | ret = count; |
| 853 | end: |
| 854 | rcu_read_unlock(); |
| 855 | return ret; |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | * RCU safe free context structure. |
| 860 | */ |
| 861 | static void destroy_context_rcu(struct rcu_head *head) |
| 862 | { |
| 863 | struct lttng_ht_node_ulong *node = |
| 864 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 865 | struct ltt_ust_context *ctx = |
| 866 | caa_container_of(node, struct ltt_ust_context, node); |
| 867 | |
| 868 | free(ctx); |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Cleanup UST context hash table. |
| 873 | */ |
| 874 | static void destroy_contexts(struct lttng_ht *ht) |
| 875 | { |
| 876 | int ret; |
| 877 | struct lttng_ht_node_ulong *node; |
| 878 | struct lttng_ht_iter iter; |
| 879 | struct ltt_ust_context *ctx; |
| 880 | |
| 881 | assert(ht); |
| 882 | |
| 883 | rcu_read_lock(); |
| 884 | cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) { |
| 885 | /* Remove from ordered list. */ |
| 886 | ctx = caa_container_of(node, struct ltt_ust_context, node); |
| 887 | cds_list_del(&ctx->list); |
| 888 | /* Remove from channel's hash table. */ |
| 889 | ret = lttng_ht_del(ht, &iter); |
| 890 | if (!ret) { |
| 891 | call_rcu(&node->head, destroy_context_rcu); |
| 892 | } |
| 893 | } |
| 894 | rcu_read_unlock(); |
| 895 | |
| 896 | ht_cleanup_push(ht); |
| 897 | } |
| 898 | |
| 899 | /* |
| 900 | * Cleanup ust event structure. |
| 901 | */ |
| 902 | void trace_ust_destroy_event(struct ltt_ust_event *event) |
| 903 | { |
| 904 | assert(event); |
| 905 | |
| 906 | DBG2("Trace destroy UST event %s", event->attr.name); |
| 907 | free(event->filter_expression); |
| 908 | free(event->filter); |
| 909 | free(event->exclusion); |
| 910 | free(event); |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * URCU intermediate call to complete destroy event. |
| 915 | */ |
| 916 | static void destroy_event_rcu(struct rcu_head *head) |
| 917 | { |
| 918 | struct lttng_ht_node_str *node = |
| 919 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 920 | struct ltt_ust_event *event = |
| 921 | caa_container_of(node, struct ltt_ust_event, node); |
| 922 | |
| 923 | trace_ust_destroy_event(event); |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * Cleanup UST events hashtable. |
| 928 | */ |
| 929 | static void destroy_events(struct lttng_ht *events) |
| 930 | { |
| 931 | int ret; |
| 932 | struct lttng_ht_node_str *node; |
| 933 | struct lttng_ht_iter iter; |
| 934 | |
| 935 | assert(events); |
| 936 | |
| 937 | rcu_read_lock(); |
| 938 | cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) { |
| 939 | ret = lttng_ht_del(events, &iter); |
| 940 | assert(!ret); |
| 941 | call_rcu(&node->head, destroy_event_rcu); |
| 942 | } |
| 943 | rcu_read_unlock(); |
| 944 | |
| 945 | ht_cleanup_push(events); |
| 946 | } |
| 947 | |
| 948 | /* |
| 949 | * Cleanup ust channel structure. |
| 950 | * |
| 951 | * Should _NOT_ be called with RCU read lock held. |
| 952 | */ |
| 953 | static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 954 | { |
| 955 | assert(channel); |
| 956 | |
| 957 | DBG2("Trace destroy UST channel %s", channel->name); |
| 958 | |
| 959 | /* Destroying all events of the channel */ |
| 960 | destroy_events(channel->events); |
| 961 | /* Destroying all context of the channel */ |
| 962 | destroy_contexts(channel->ctx); |
| 963 | |
| 964 | free(channel); |
| 965 | } |
| 966 | |
| 967 | /* |
| 968 | * URCU intermediate call to complete destroy channel. |
| 969 | */ |
| 970 | static void destroy_channel_rcu(struct rcu_head *head) |
| 971 | { |
| 972 | struct lttng_ht_node_str *node = |
| 973 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 974 | struct ltt_ust_channel *channel = |
| 975 | caa_container_of(node, struct ltt_ust_channel, node); |
| 976 | |
| 977 | _trace_ust_destroy_channel(channel); |
| 978 | } |
| 979 | |
| 980 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 981 | { |
| 982 | call_rcu(&channel->node.head, destroy_channel_rcu); |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * Remove an UST channel from a channel HT. |
| 987 | */ |
| 988 | void trace_ust_delete_channel(struct lttng_ht *ht, |
| 989 | struct ltt_ust_channel *channel) |
| 990 | { |
| 991 | int ret; |
| 992 | struct lttng_ht_iter iter; |
| 993 | |
| 994 | assert(ht); |
| 995 | assert(channel); |
| 996 | |
| 997 | iter.iter.node = &channel->node.node; |
| 998 | ret = lttng_ht_del(ht, &iter); |
| 999 | assert(!ret); |
| 1000 | } |
| 1001 | |
| 1002 | /* |
| 1003 | * Iterate over a hash table containing channels and cleanup safely. |
| 1004 | */ |
| 1005 | static void destroy_channels(struct lttng_ht *channels) |
| 1006 | { |
| 1007 | int ret; |
| 1008 | struct lttng_ht_node_str *node; |
| 1009 | struct lttng_ht_iter iter; |
| 1010 | |
| 1011 | assert(channels); |
| 1012 | |
| 1013 | rcu_read_lock(); |
| 1014 | |
| 1015 | cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) { |
| 1016 | ret = lttng_ht_del(channels, &iter); |
| 1017 | assert(!ret); |
| 1018 | call_rcu(&node->head, destroy_channel_rcu); |
| 1019 | } |
| 1020 | rcu_read_unlock(); |
| 1021 | |
| 1022 | ht_cleanup_push(channels); |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Cleanup UST global domain. |
| 1027 | */ |
| 1028 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) |
| 1029 | { |
| 1030 | assert(dom); |
| 1031 | |
| 1032 | destroy_channels(dom->channels); |
| 1033 | } |
| 1034 | |
| 1035 | /* |
| 1036 | * Cleanup ust session structure |
| 1037 | * |
| 1038 | * Should *NOT* be called with RCU read-side lock held. |
| 1039 | */ |
| 1040 | void trace_ust_destroy_session(struct ltt_ust_session *session) |
| 1041 | { |
| 1042 | struct agent *agt; |
| 1043 | struct buffer_reg_uid *reg, *sreg; |
| 1044 | struct lttng_ht_iter iter; |
| 1045 | |
| 1046 | assert(session); |
| 1047 | |
| 1048 | DBG2("Trace UST destroy session %" PRIu64, session->id); |
| 1049 | |
| 1050 | /* Cleaning up UST domain */ |
| 1051 | destroy_domain_global(&session->domain_global); |
| 1052 | |
| 1053 | rcu_read_lock(); |
| 1054 | cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) { |
| 1055 | int ret = lttng_ht_del(session->agents, &iter); |
| 1056 | |
| 1057 | assert(!ret); |
| 1058 | agent_destroy(agt); |
| 1059 | } |
| 1060 | rcu_read_unlock(); |
| 1061 | |
| 1062 | ht_cleanup_push(session->agents); |
| 1063 | |
| 1064 | /* Cleanup UID buffer registry object(s). */ |
| 1065 | cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list, |
| 1066 | lnode) { |
| 1067 | cds_list_del(®->lnode); |
| 1068 | buffer_reg_uid_remove(reg); |
| 1069 | buffer_reg_uid_destroy(reg, session->consumer); |
| 1070 | } |
| 1071 | |
| 1072 | consumer_destroy_output(session->consumer); |
| 1073 | consumer_destroy_output(session->tmp_consumer); |
| 1074 | |
| 1075 | fini_pid_tracker(&session->pid_tracker); |
| 1076 | |
| 1077 | free(session); |
| 1078 | } |