| 1 | /* |
| 2 | * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <fcntl.h> |
| 9 | #include <sys/mman.h> |
| 10 | #include <sys/stat.h> |
| 11 | #include <unistd.h> |
| 12 | #include <urcu/compiler.h> |
| 13 | #include <pthread.h> |
| 14 | |
| 15 | #include <common/error.h> |
| 16 | #include <common/hashtable/hashtable.h> |
| 17 | #include <common/index-allocator.h> |
| 18 | #include <common/kernel-ctl/kernel-ctl.h> |
| 19 | #include <common/shm.h> |
| 20 | #include <lttng/trigger/trigger-internal.h> |
| 21 | |
| 22 | #include "event-notifier-error-accounting.h" |
| 23 | #include "lttng-ust-error.h" |
| 24 | #include "ust-app.h" |
| 25 | |
| 26 | #define ERROR_COUNTER_INDEX_HT_INITIAL_SIZE 16 |
| 27 | |
| 28 | struct index_ht_entry { |
| 29 | struct lttng_ht_node_u64 node; |
| 30 | uint64_t error_counter_index; |
| 31 | struct rcu_head rcu_head; |
| 32 | }; |
| 33 | |
| 34 | struct ust_error_accounting_entry { |
| 35 | uid_t uid; |
| 36 | struct urcu_ref ref; |
| 37 | struct lttng_ht_node_u64 node; |
| 38 | struct rcu_head rcu_head; |
| 39 | struct lttng_ust_ctl_daemon_counter *daemon_counter; |
| 40 | /* |
| 41 | * Those `lttng_ust_abi_object_data` are anonymous handles to the |
| 42 | * counters objects. |
| 43 | * They are only used to be duplicated for each new applications of the |
| 44 | * user. To destroy them, call with the `sock` parameter set to -1. |
| 45 | * e.g. `lttng_ust_ctl_release_object(-1, data)`; |
| 46 | */ |
| 47 | struct lttng_ust_abi_object_data *counter; |
| 48 | struct lttng_ust_abi_object_data **cpu_counters; |
| 49 | int nr_counter_cpu_fds; |
| 50 | }; |
| 51 | |
| 52 | struct kernel_error_accounting_entry { |
| 53 | int error_counter_fd; |
| 54 | }; |
| 55 | |
| 56 | static struct kernel_error_accounting_entry kernel_error_accounting_entry; |
| 57 | |
| 58 | /* Hashtable mapping uid to error_account_entry. */ |
| 59 | static struct lttng_ht *error_counter_uid_ht; |
| 60 | |
| 61 | struct error_accounting_state { |
| 62 | struct lttng_index_allocator *index_allocator; |
| 63 | /* Hashtable mapping event notifier token to index_ht_entry. */ |
| 64 | struct lttng_ht *indices_ht; |
| 65 | uint64_t number_indices; |
| 66 | }; |
| 67 | |
| 68 | static struct error_accounting_state ust_state; |
| 69 | static struct error_accounting_state kernel_state; |
| 70 | |
| 71 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
| 72 | const char **trigger_name, |
| 73 | uid_t *trigger_owner_uid) |
| 74 | { |
| 75 | enum lttng_trigger_status trigger_status; |
| 76 | |
| 77 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); |
| 78 | switch (trigger_status) { |
| 79 | case LTTNG_TRIGGER_STATUS_OK: |
| 80 | break; |
| 81 | case LTTNG_TRIGGER_STATUS_UNSET: |
| 82 | *trigger_name = "(anonymous)"; |
| 83 | break; |
| 84 | default: |
| 85 | abort(); |
| 86 | } |
| 87 | |
| 88 | trigger_status = lttng_trigger_get_owner_uid(trigger, |
| 89 | trigger_owner_uid); |
| 90 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 91 | } |
| 92 | |
| 93 | static inline |
| 94 | const char *error_accounting_status_str( |
| 95 | enum event_notifier_error_accounting_status status) |
| 96 | { |
| 97 | switch (status) { |
| 98 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: |
| 99 | return "OK"; |
| 100 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR: |
| 101 | return "ERROR"; |
| 102 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND: |
| 103 | return "NOT_FOUND"; |
| 104 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM: |
| 105 | return "NOMEM"; |
| 106 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE: |
| 107 | return "NO_INDEX_AVAILABLE"; |
| 108 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD: |
| 109 | return "APP_DEAD"; |
| 110 | default: |
| 111 | abort(); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 116 | struct event_notifier_counter { |
| 117 | pthread_mutex_t lock; |
| 118 | long count; |
| 119 | }; |
| 120 | |
| 121 | static struct event_notifier_counter the_event_notifier_counter; |
| 122 | |
| 123 | static void free_ust_error_accounting_entry(struct rcu_head *head) |
| 124 | { |
| 125 | int i; |
| 126 | struct ust_error_accounting_entry *entry = |
| 127 | caa_container_of(head, typeof(*entry), rcu_head); |
| 128 | |
| 129 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 130 | lttng_ust_ctl_release_object(-1, entry->cpu_counters[i]); |
| 131 | free(entry->cpu_counters[i]); |
| 132 | } |
| 133 | |
| 134 | free(entry->cpu_counters); |
| 135 | |
| 136 | lttng_ust_ctl_release_object(-1, entry->counter); |
| 137 | free(entry->counter); |
| 138 | |
| 139 | lttng_ust_ctl_destroy_counter(entry->daemon_counter); |
| 140 | |
| 141 | free(entry); |
| 142 | } |
| 143 | |
| 144 | static |
| 145 | bool ust_error_accounting_entry_get(struct ust_error_accounting_entry *entry) |
| 146 | { |
| 147 | return urcu_ref_get_unless_zero(&entry->ref); |
| 148 | } |
| 149 | |
| 150 | static |
| 151 | void ust_error_accounting_entry_release(struct urcu_ref *entry_ref) |
| 152 | { |
| 153 | struct ust_error_accounting_entry *entry = |
| 154 | container_of(entry_ref, typeof(*entry), ref); |
| 155 | |
| 156 | rcu_read_lock(); |
| 157 | cds_lfht_del(error_counter_uid_ht->ht, &entry->node.node); |
| 158 | call_rcu(&entry->rcu_head, free_ust_error_accounting_entry); |
| 159 | rcu_read_unlock(); |
| 160 | } |
| 161 | |
| 162 | |
| 163 | static |
| 164 | void ust_error_accounting_entry_put(struct ust_error_accounting_entry *entry) |
| 165 | { |
| 166 | if (!entry) { |
| 167 | return; |
| 168 | } |
| 169 | |
| 170 | urcu_ref_put(&entry->ref, ust_error_accounting_entry_release); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Put one reference to every UID entries. |
| 175 | */ |
| 176 | static |
| 177 | void put_ref_all_ust_error_accounting_entry(void) |
| 178 | { |
| 179 | struct lttng_ht_iter iter; |
| 180 | struct ust_error_accounting_entry *uid_entry; |
| 181 | |
| 182 | ASSERT_LOCKED(the_event_notifier_counter.lock); |
| 183 | |
| 184 | rcu_read_lock(); |
| 185 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
| 186 | uid_entry, node.node) { |
| 187 | ust_error_accounting_entry_put(uid_entry); |
| 188 | } |
| 189 | |
| 190 | rcu_read_unlock(); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Get one reference to every UID entries. |
| 195 | */ |
| 196 | static |
| 197 | void get_ref_all_ust_error_accounting_entry(void) |
| 198 | { |
| 199 | struct lttng_ht_iter iter; |
| 200 | struct ust_error_accounting_entry *uid_entry; |
| 201 | |
| 202 | ASSERT_LOCKED(the_event_notifier_counter.lock); |
| 203 | |
| 204 | rcu_read_lock(); |
| 205 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
| 206 | uid_entry, node.node) { |
| 207 | ust_error_accounting_entry_get(uid_entry); |
| 208 | } |
| 209 | |
| 210 | rcu_read_unlock(); |
| 211 | } |
| 212 | |
| 213 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 214 | |
| 215 | static |
| 216 | enum event_notifier_error_accounting_status |
| 217 | init_error_accounting_state(struct error_accounting_state *state, |
| 218 | uint64_t index_count) |
| 219 | { |
| 220 | enum event_notifier_error_accounting_status status; |
| 221 | |
| 222 | LTTNG_ASSERT(state); |
| 223 | |
| 224 | state->number_indices = index_count; |
| 225 | |
| 226 | state->index_allocator = lttng_index_allocator_create(index_count); |
| 227 | if (!state->index_allocator) { |
| 228 | ERR("Failed to allocate event notifier error counter index allocator"); |
| 229 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 230 | goto end; |
| 231 | } |
| 232 | |
| 233 | state->indices_ht = lttng_ht_new(ERROR_COUNTER_INDEX_HT_INITIAL_SIZE, |
| 234 | LTTNG_HT_TYPE_U64); |
| 235 | if (!state->indices_ht) { |
| 236 | ERR("Failed to allocate error counter indices hash table"); |
| 237 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 238 | goto error_indices_ht; |
| 239 | } |
| 240 | |
| 241 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 242 | goto end; |
| 243 | |
| 244 | error_indices_ht: |
| 245 | lttng_index_allocator_destroy(state->index_allocator); |
| 246 | state->index_allocator = NULL; |
| 247 | end: |
| 248 | return status; |
| 249 | } |
| 250 | |
| 251 | static |
| 252 | void fini_error_accounting_state(struct error_accounting_state *state) |
| 253 | { |
| 254 | LTTNG_ASSERT(state); |
| 255 | |
| 256 | /* |
| 257 | * Will assert if some error counter indices were not released (an |
| 258 | * internal error). |
| 259 | */ |
| 260 | lttng_ht_destroy(state->indices_ht); |
| 261 | lttng_index_allocator_destroy(state->index_allocator); |
| 262 | } |
| 263 | |
| 264 | enum event_notifier_error_accounting_status |
| 265 | event_notifier_error_accounting_init(uint64_t buffer_size_kernel, |
| 266 | uint64_t buffer_size_ust) |
| 267 | { |
| 268 | enum event_notifier_error_accounting_status status; |
| 269 | |
| 270 | status = init_error_accounting_state(&kernel_state, buffer_size_kernel); |
| 271 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 272 | ERR("Failed to initialize kernel event notifier accounting state: status = %s", |
| 273 | error_accounting_status_str(status)); |
| 274 | goto end; |
| 275 | } |
| 276 | |
| 277 | status = init_error_accounting_state(&ust_state, buffer_size_ust); |
| 278 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 279 | ERR("Failed to initialize UST event notifier accounting state: status = %s", |
| 280 | error_accounting_status_str(status)); |
| 281 | goto error_ust_state; |
| 282 | } |
| 283 | |
| 284 | error_counter_uid_ht = lttng_ht_new( |
| 285 | ERROR_COUNTER_INDEX_HT_INITIAL_SIZE, LTTNG_HT_TYPE_U64); |
| 286 | if (!error_counter_uid_ht) { |
| 287 | ERR("Failed to allocate UID to error counter accountant hash table"); |
| 288 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 289 | goto error_uid_ht; |
| 290 | } |
| 291 | |
| 292 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 293 | goto end; |
| 294 | |
| 295 | error_uid_ht: |
| 296 | fini_error_accounting_state(&ust_state); |
| 297 | error_ust_state: |
| 298 | fini_error_accounting_state(&kernel_state); |
| 299 | end: |
| 300 | return status; |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Return the error counteur index associated to this event notifier tracer |
| 305 | * token. Returns _STATUS_OK if found and _STATUS_NOT_FOUND otherwise. |
| 306 | */ |
| 307 | static |
| 308 | enum event_notifier_error_accounting_status get_error_counter_index_for_token( |
| 309 | struct error_accounting_state *state, uint64_t tracer_token, |
| 310 | uint64_t *error_counter_index) |
| 311 | { |
| 312 | struct lttng_ht_node_u64 *node; |
| 313 | struct lttng_ht_iter iter; |
| 314 | const struct index_ht_entry *index_entry; |
| 315 | enum event_notifier_error_accounting_status status; |
| 316 | |
| 317 | rcu_read_lock(); |
| 318 | lttng_ht_lookup(state->indices_ht, &tracer_token, &iter); |
| 319 | node = lttng_ht_iter_get_node_u64(&iter); |
| 320 | if (node) { |
| 321 | index_entry = caa_container_of( |
| 322 | node, const struct index_ht_entry, node); |
| 323 | *error_counter_index = index_entry->error_counter_index; |
| 324 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 325 | } else { |
| 326 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND; |
| 327 | } |
| 328 | |
| 329 | rcu_read_unlock(); |
| 330 | return status; |
| 331 | } |
| 332 | |
| 333 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 334 | /* |
| 335 | * Find the entry for this app's UID, the caller acquires a reference if the |
| 336 | * entry is found. |
| 337 | */ |
| 338 | static |
| 339 | struct ust_error_accounting_entry *ust_error_accounting_entry_find( |
| 340 | struct lttng_ht *uid_ht, const struct ust_app *app) |
| 341 | { |
| 342 | struct ust_error_accounting_entry *entry; |
| 343 | struct lttng_ht_node_u64 *node; |
| 344 | struct lttng_ht_iter iter; |
| 345 | uint64_t key = app->uid; |
| 346 | |
| 347 | lttng_ht_lookup(uid_ht, &key, &iter); |
| 348 | node = lttng_ht_iter_get_node_u64(&iter); |
| 349 | if(node == NULL) { |
| 350 | entry = NULL; |
| 351 | } else { |
| 352 | bool got_ref; |
| 353 | |
| 354 | entry = caa_container_of(node, |
| 355 | struct ust_error_accounting_entry, node); |
| 356 | |
| 357 | got_ref = ust_error_accounting_entry_get(entry); |
| 358 | if (!got_ref) { |
| 359 | entry = NULL; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | return entry; |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * Create the entry for this app's UID, the caller acquires a reference to the |
| 368 | * entry, |
| 369 | */ |
| 370 | static |
| 371 | struct ust_error_accounting_entry *ust_error_accounting_entry_create( |
| 372 | struct lttng_ht *uid_ht, const struct ust_app *app) |
| 373 | { |
| 374 | int i, ret, *cpu_counter_fds = NULL; |
| 375 | struct lttng_ust_ctl_daemon_counter *daemon_counter; |
| 376 | struct lttng_ust_abi_object_data *counter, **cpu_counters; |
| 377 | struct ust_error_accounting_entry *entry = NULL; |
| 378 | const struct lttng_ust_ctl_counter_dimension dimension = { |
| 379 | .size = ust_state.number_indices, |
| 380 | .has_underflow = false, |
| 381 | .has_overflow = false, |
| 382 | }; |
| 383 | |
| 384 | if (!ust_app_supports_counters(app)) { |
| 385 | DBG("Refusing to create accounting entry for application (unsupported feature): app name = '%s', app ppid = %d", |
| 386 | app->name, (int) app->ppid); |
| 387 | goto error; |
| 388 | } |
| 389 | |
| 390 | entry = zmalloc(sizeof(struct ust_error_accounting_entry)); |
| 391 | if (!entry) { |
| 392 | PERROR("Failed to allocate event notifier error acounting entry") |
| 393 | goto error; |
| 394 | } |
| 395 | |
| 396 | urcu_ref_init(&entry->ref); |
| 397 | entry->uid = app->uid; |
| 398 | entry->nr_counter_cpu_fds = lttng_ust_ctl_get_nr_cpu_per_counter(); |
| 399 | |
| 400 | cpu_counter_fds = zmalloc(entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds)); |
| 401 | if (!cpu_counter_fds) { |
| 402 | PERROR("Failed to allocate event notifier error counter file descriptors array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu", |
| 403 | (int) app->uid, app->name, (int) app->pid, |
| 404 | entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds)); |
| 405 | goto error_counter_cpu_fds_alloc; |
| 406 | } |
| 407 | |
| 408 | /* Initialize to an invalid fd value to closes fds in case of error. */ |
| 409 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 410 | cpu_counter_fds[i] = -1; |
| 411 | } |
| 412 | |
| 413 | cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
| 414 | if (!cpu_counters) { |
| 415 | PERROR("Failed to allocate event notifier error counter lttng_ust_abi_object_data array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu", |
| 416 | (int) app->uid, app->name, (int) app->pid, |
| 417 | entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
| 418 | goto error_counter_cpus_alloc; |
| 419 | } |
| 420 | |
| 421 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 422 | cpu_counter_fds[i] = shm_create_anonymous("event-notifier-error-accounting"); |
| 423 | if (cpu_counter_fds[i] == -1) { |
| 424 | ERR("Failed to create event notifier error accounting shared memory for application user: application uid = %d, pid = %d, application name = '%s'", |
| 425 | (int) app->uid, (int) app->pid, app->name); |
| 426 | goto error_shm_alloc; |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Ownership of the file descriptors transferred to the ustctl object. |
| 432 | */ |
| 433 | daemon_counter = lttng_ust_ctl_create_counter(1, &dimension, 0, -1, |
| 434 | entry->nr_counter_cpu_fds, cpu_counter_fds, |
| 435 | LTTNG_UST_CTL_COUNTER_BITNESS_32, |
| 436 | LTTNG_UST_CTL_COUNTER_ARITHMETIC_MODULAR, |
| 437 | LTTNG_UST_CTL_COUNTER_ALLOC_PER_CPU, |
| 438 | false); |
| 439 | if (!daemon_counter) { |
| 440 | goto error_create_daemon_counter; |
| 441 | } |
| 442 | |
| 443 | ret = lttng_ust_ctl_create_counter_data(daemon_counter, &counter); |
| 444 | if (ret) { |
| 445 | ERR("Failed to create userspace tracer counter data for application user: uid = %d, pid = %d, application name = '%s'", |
| 446 | (int) app->uid, (int) app->pid, app->name); |
| 447 | goto error_create_counter_data; |
| 448 | } |
| 449 | |
| 450 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 451 | ret = lttng_ust_ctl_create_counter_cpu_data(daemon_counter, i, |
| 452 | &cpu_counters[i]); |
| 453 | if (ret) { |
| 454 | ERR("Failed to create userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'", |
| 455 | (int) app->uid, (int) app->pid, |
| 456 | app->name); |
| 457 | goto error_create_counter_cpu_data; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | entry->daemon_counter = daemon_counter; |
| 462 | entry->counter = counter; |
| 463 | entry->cpu_counters = cpu_counters; |
| 464 | |
| 465 | lttng_ht_node_init_u64(&entry->node, entry->uid); |
| 466 | lttng_ht_add_unique_u64(error_counter_uid_ht, &entry->node); |
| 467 | |
| 468 | goto end; |
| 469 | |
| 470 | error_create_counter_cpu_data: |
| 471 | /* Teardown any allocated cpu counters. */ |
| 472 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 473 | if (!cpu_counters[i]) { |
| 474 | /* |
| 475 | * Early-exit when error occurred before all cpu |
| 476 | * counters could be initialized. |
| 477 | */ |
| 478 | break; |
| 479 | } |
| 480 | |
| 481 | lttng_ust_ctl_release_object(-1, cpu_counters[i]); |
| 482 | free(cpu_counters[i]); |
| 483 | } |
| 484 | |
| 485 | lttng_ust_ctl_release_object(-1, entry->counter); |
| 486 | free(entry->counter); |
| 487 | error_create_counter_data: |
| 488 | lttng_ust_ctl_destroy_counter(daemon_counter); |
| 489 | error_create_daemon_counter: |
| 490 | error_shm_alloc: |
| 491 | /* Error occurred before per-cpu SHMs were handed-off to ustctl. */ |
| 492 | if (cpu_counter_fds) { |
| 493 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 494 | if (cpu_counter_fds[i] < 0) { |
| 495 | /* |
| 496 | * Early-exit when error occurred before all cpu |
| 497 | * counter shm fds could be initialized. |
| 498 | */ |
| 499 | break; |
| 500 | } |
| 501 | |
| 502 | ret = close(cpu_counter_fds[i]); |
| 503 | if (ret) { |
| 504 | PERROR("Failed to close error counter per-CPU shm file descriptor: fd = %d", |
| 505 | cpu_counter_fds[i]); |
| 506 | } |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | free(cpu_counters); |
| 511 | error_counter_cpus_alloc: |
| 512 | error_counter_cpu_fds_alloc: |
| 513 | free(entry); |
| 514 | error: |
| 515 | entry = NULL; |
| 516 | end: |
| 517 | free(cpu_counter_fds); |
| 518 | return entry; |
| 519 | } |
| 520 | |
| 521 | static |
| 522 | enum event_notifier_error_accounting_status send_counter_data_to_ust( |
| 523 | struct ust_app *app, |
| 524 | struct lttng_ust_abi_object_data *new_counter) |
| 525 | { |
| 526 | int ret; |
| 527 | enum event_notifier_error_accounting_status status; |
| 528 | |
| 529 | /* Attach counter to trigger group. */ |
| 530 | pthread_mutex_lock(&app->sock_lock); |
| 531 | ret = lttng_ust_ctl_send_counter_data_to_ust(app->sock, |
| 532 | app->event_notifier_group.object->handle, new_counter); |
| 533 | pthread_mutex_unlock(&app->sock_lock); |
| 534 | if (ret < 0) { |
| 535 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 536 | ERR("Failed to send counter data to application: application name = '%s', pid = %d, ret = %d", |
| 537 | app->name, app->pid, ret); |
| 538 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 539 | } else { |
| 540 | DBG3("Failed to send counter data to application (application is dead): application name = '%s', pid = %d, ret = %d", |
| 541 | app->name, app->pid, ret); |
| 542 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD; |
| 543 | } |
| 544 | |
| 545 | goto end; |
| 546 | } |
| 547 | |
| 548 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 549 | end: |
| 550 | return status; |
| 551 | } |
| 552 | |
| 553 | static |
| 554 | enum event_notifier_error_accounting_status send_counter_cpu_data_to_ust( |
| 555 | struct ust_app *app, |
| 556 | struct lttng_ust_abi_object_data *counter, |
| 557 | struct lttng_ust_abi_object_data *counter_cpu) |
| 558 | { |
| 559 | int ret; |
| 560 | enum event_notifier_error_accounting_status status; |
| 561 | |
| 562 | pthread_mutex_lock(&app->sock_lock); |
| 563 | ret = lttng_ust_ctl_send_counter_cpu_data_to_ust(app->sock, |
| 564 | counter, counter_cpu); |
| 565 | pthread_mutex_unlock(&app->sock_lock); |
| 566 | if (ret < 0) { |
| 567 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 568 | ERR("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d", |
| 569 | app->name, app->pid, ret); |
| 570 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 571 | } else { |
| 572 | DBG3("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d", |
| 573 | app->name, app->pid, ret); |
| 574 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD; |
| 575 | } |
| 576 | |
| 577 | goto end; |
| 578 | } |
| 579 | |
| 580 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 581 | end: |
| 582 | return status; |
| 583 | } |
| 584 | |
| 585 | enum event_notifier_error_accounting_status |
| 586 | event_notifier_error_accounting_register_app(struct ust_app *app) |
| 587 | { |
| 588 | int ret; |
| 589 | uint64_t i; |
| 590 | struct lttng_ust_abi_object_data *new_counter; |
| 591 | struct ust_error_accounting_entry *entry; |
| 592 | enum event_notifier_error_accounting_status status; |
| 593 | struct lttng_ust_abi_object_data **cpu_counters; |
| 594 | |
| 595 | if (!ust_app_supports_counters(app)) { |
| 596 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_UNSUPPORTED; |
| 597 | goto end; |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * Check if we already have a error counter for the user id of this |
| 602 | * app. If not, create one. |
| 603 | */ |
| 604 | rcu_read_lock(); |
| 605 | entry = ust_error_accounting_entry_find(error_counter_uid_ht, app); |
| 606 | if (entry == NULL) { |
| 607 | /* |
| 608 | * Take the event notifier counter lock before creating the new |
| 609 | * entry to ensure that no event notifier is registered between |
| 610 | * the the entry creation and event notifier count check. |
| 611 | */ |
| 612 | pthread_mutex_lock(&the_event_notifier_counter.lock); |
| 613 | |
| 614 | entry = ust_error_accounting_entry_create(error_counter_uid_ht, |
| 615 | app); |
| 616 | if (!entry) { |
| 617 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 618 | pthread_mutex_unlock(&the_event_notifier_counter.lock); |
| 619 | goto error_creating_entry; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * We just created a new UID entry, If there are event |
| 624 | * notifiers already registered, take one reference on their |
| 625 | * behalf. |
| 626 | */ |
| 627 | if (the_event_notifier_counter.count > 0) { |
| 628 | ust_error_accounting_entry_get(entry); |
| 629 | } |
| 630 | |
| 631 | pthread_mutex_unlock(&the_event_notifier_counter.lock); |
| 632 | } |
| 633 | |
| 634 | /* Duplicate counter object data. */ |
| 635 | ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter, |
| 636 | entry->counter); |
| 637 | if (ret) { |
| 638 | ERR("Failed to duplicate event notifier error accounting counter for application user: application uid = %d, pid = %d, application name = '%s'", |
| 639 | (int) app->uid, (int) app->pid, app->name); |
| 640 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 641 | goto error_duplicate_counter; |
| 642 | } |
| 643 | |
| 644 | status = send_counter_data_to_ust(app, new_counter); |
| 645 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 646 | if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) { |
| 647 | goto error_send_counter_data; |
| 648 | } |
| 649 | |
| 650 | ERR("Failed to send counter data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'", |
| 651 | error_accounting_status_str(status), |
| 652 | (int) app->uid, (int) app->pid, app->name); |
| 653 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 654 | goto error_send_counter_data; |
| 655 | } |
| 656 | |
| 657 | cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
| 658 | if (!cpu_counters) { |
| 659 | PERROR("Failed to allocate event notifier error counter lttng_ust_abi_object_data array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu", |
| 660 | (int) app->uid, app->name, (int) app->pid, |
| 661 | entry->nr_counter_cpu_fds * sizeof(**cpu_counters)); |
| 662 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 663 | goto error_allocate_cpu_counters; |
| 664 | } |
| 665 | |
| 666 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 667 | struct lttng_ust_abi_object_data *new_counter_cpu = NULL; |
| 668 | |
| 669 | ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter_cpu, |
| 670 | entry->cpu_counters[i]); |
| 671 | if (ret) { |
| 672 | ERR("Failed to duplicate userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'", |
| 673 | (int) app->uid, (int) app->pid, |
| 674 | app->name); |
| 675 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 676 | goto error_duplicate_cpu_counter; |
| 677 | } |
| 678 | |
| 679 | cpu_counters[i] = new_counter_cpu; |
| 680 | |
| 681 | status = send_counter_cpu_data_to_ust(app, new_counter, |
| 682 | new_counter_cpu); |
| 683 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 684 | if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) { |
| 685 | goto error_send_cpu_counter_data; |
| 686 | } |
| 687 | |
| 688 | ERR("Failed to send counter cpu data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'", |
| 689 | error_accounting_status_str(status), |
| 690 | (int) app->uid, (int) app->pid, |
| 691 | app->name); |
| 692 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 693 | goto error_send_cpu_counter_data; |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | app->event_notifier_group.counter = new_counter; |
| 698 | new_counter = NULL; |
| 699 | app->event_notifier_group.nr_counter_cpu = entry->nr_counter_cpu_fds; |
| 700 | app->event_notifier_group.counter_cpu = cpu_counters; |
| 701 | cpu_counters = NULL; |
| 702 | goto end_unlock; |
| 703 | |
| 704 | error_send_cpu_counter_data: |
| 705 | error_duplicate_cpu_counter: |
| 706 | /* Teardown any duplicated cpu counters. */ |
| 707 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { |
| 708 | if (!cpu_counters[i]) { |
| 709 | /* |
| 710 | * Early-exit when error occurred before all cpu |
| 711 | * counters could be initialized. |
| 712 | */ |
| 713 | break; |
| 714 | } |
| 715 | |
| 716 | lttng_ust_ctl_release_object(-1, cpu_counters[i]); |
| 717 | free(cpu_counters[i]); |
| 718 | } |
| 719 | |
| 720 | free(cpu_counters); |
| 721 | |
| 722 | error_allocate_cpu_counters: |
| 723 | error_send_counter_data: |
| 724 | lttng_ust_ctl_release_object(-1, new_counter); |
| 725 | free(new_counter); |
| 726 | error_duplicate_counter: |
| 727 | ust_error_accounting_entry_put(entry); |
| 728 | error_creating_entry: |
| 729 | app->event_notifier_group.counter = NULL; |
| 730 | end_unlock: |
| 731 | rcu_read_unlock(); |
| 732 | end: |
| 733 | return status; |
| 734 | } |
| 735 | |
| 736 | enum event_notifier_error_accounting_status |
| 737 | event_notifier_error_accounting_unregister_app(struct ust_app *app) |
| 738 | { |
| 739 | enum event_notifier_error_accounting_status status; |
| 740 | struct ust_error_accounting_entry *entry; |
| 741 | int i; |
| 742 | |
| 743 | rcu_read_lock(); |
| 744 | |
| 745 | /* If an error occurred during app registration no entry was created. */ |
| 746 | if (!app->event_notifier_group.counter) { |
| 747 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 748 | goto end; |
| 749 | } |
| 750 | |
| 751 | entry = ust_error_accounting_entry_find(error_counter_uid_ht, app); |
| 752 | if (entry == NULL) { |
| 753 | ERR("Failed to find event notitifier error accounting entry on application teardown: pid = %d, application name = '%s'", |
| 754 | app->pid, app->name); |
| 755 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 756 | goto end; |
| 757 | } else { |
| 758 | /* |
| 759 | * Put the entry twice as we acquired a reference from the |
| 760 | * `ust_error_accounting_entry_find()` above. |
| 761 | */ |
| 762 | ust_error_accounting_entry_put(entry); |
| 763 | ust_error_accounting_entry_put(entry); |
| 764 | } |
| 765 | |
| 766 | for (i = 0; i < app->event_notifier_group.nr_counter_cpu; i++) { |
| 767 | lttng_ust_ctl_release_object(app->sock, |
| 768 | app->event_notifier_group.counter_cpu[i]); |
| 769 | free(app->event_notifier_group.counter_cpu[i]); |
| 770 | } |
| 771 | |
| 772 | free(app->event_notifier_group.counter_cpu); |
| 773 | |
| 774 | lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.counter); |
| 775 | free(app->event_notifier_group.counter); |
| 776 | |
| 777 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 778 | end: |
| 779 | rcu_read_unlock(); |
| 780 | return status; |
| 781 | } |
| 782 | |
| 783 | static |
| 784 | enum event_notifier_error_accounting_status |
| 785 | event_notifier_error_accounting_ust_get_count( |
| 786 | const struct lttng_trigger *trigger, uint64_t *count) |
| 787 | { |
| 788 | struct lttng_ht_iter iter; |
| 789 | struct ust_error_accounting_entry *uid_entry; |
| 790 | uint64_t error_counter_index, global_sum = 0; |
| 791 | enum event_notifier_error_accounting_status status; |
| 792 | size_t dimension_indexes[1]; |
| 793 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); |
| 794 | uid_t trigger_owner_uid; |
| 795 | const char *trigger_name; |
| 796 | |
| 797 | |
| 798 | rcu_read_lock(); |
| 799 | |
| 800 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); |
| 801 | |
| 802 | status = get_error_counter_index_for_token(&ust_state, tracer_token, |
| 803 | &error_counter_index); |
| 804 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 805 | |
| 806 | ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s", |
| 807 | tracer_token, trigger_name, |
| 808 | (int) trigger_owner_uid, |
| 809 | error_accounting_status_str(status)); |
| 810 | goto end; |
| 811 | } |
| 812 | |
| 813 | dimension_indexes[0] = error_counter_index; |
| 814 | |
| 815 | /* |
| 816 | * Iterate over all the UID entries. |
| 817 | * We aggregate the value of all uid entries regardless of if the uid |
| 818 | * matches the trigger's uid because a user that is allowed to register |
| 819 | * a trigger to a given sessiond is also allowed to create an event |
| 820 | * notifier on all apps that this sessiond is aware of. |
| 821 | */ |
| 822 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
| 823 | uid_entry, node.node) { |
| 824 | int ret; |
| 825 | int64_t local_value = 0; |
| 826 | bool overflow = false, underflow = false; |
| 827 | |
| 828 | ret = lttng_ust_ctl_counter_aggregate(uid_entry->daemon_counter, |
| 829 | dimension_indexes, &local_value, &overflow, |
| 830 | &underflow); |
| 831 | if (ret || local_value < 0) { |
| 832 | if (ret) { |
| 833 | ERR("Failed to aggregate event notifier error counter values of trigger: trigger name = '%s', trigger owner uid = %d", |
| 834 | trigger_name, |
| 835 | (int) trigger_owner_uid); |
| 836 | } else if (local_value < 0) { |
| 837 | ERR("Negative event notifier error counter value encountered during aggregation: trigger name = '%s', trigger owner uid = %d, value = %" PRId64, |
| 838 | trigger_name, |
| 839 | (int) trigger_owner_uid, |
| 840 | local_value); |
| 841 | } else { |
| 842 | abort(); |
| 843 | } |
| 844 | |
| 845 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 846 | goto end; |
| 847 | } |
| 848 | |
| 849 | /* Cast is safe as negative values are checked-for above. */ |
| 850 | global_sum += (uint64_t) local_value; |
| 851 | } |
| 852 | |
| 853 | *count = global_sum; |
| 854 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 855 | |
| 856 | end: |
| 857 | rcu_read_unlock(); |
| 858 | return status; |
| 859 | } |
| 860 | |
| 861 | static |
| 862 | enum event_notifier_error_accounting_status event_notifier_error_accounting_ust_clear( |
| 863 | const struct lttng_trigger *trigger) |
| 864 | { |
| 865 | struct lttng_ht_iter iter; |
| 866 | struct ust_error_accounting_entry *uid_entry; |
| 867 | uint64_t error_counter_index; |
| 868 | enum event_notifier_error_accounting_status status; |
| 869 | size_t dimension_index; |
| 870 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); |
| 871 | |
| 872 | rcu_read_lock(); |
| 873 | status = get_error_counter_index_for_token(&ust_state, tracer_token, |
| 874 | &error_counter_index); |
| 875 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 876 | uid_t trigger_owner_uid; |
| 877 | const char *trigger_name; |
| 878 | |
| 879 | get_trigger_info_for_log(trigger, &trigger_name, |
| 880 | &trigger_owner_uid); |
| 881 | |
| 882 | ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s", |
| 883 | tracer_token, trigger_name, |
| 884 | (int) trigger_owner_uid, |
| 885 | error_accounting_status_str(status)); |
| 886 | goto end; |
| 887 | } |
| 888 | |
| 889 | dimension_index = error_counter_index; |
| 890 | |
| 891 | /* |
| 892 | * Go over all error counters (ignoring uid) as a trigger (and trigger |
| 893 | * errors) can be generated from any applications that this session |
| 894 | * daemon is managing. |
| 895 | */ |
| 896 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
| 897 | uid_entry, node.node) { |
| 898 | const int ret = lttng_ust_ctl_counter_clear(uid_entry->daemon_counter, |
| 899 | &dimension_index); |
| 900 | |
| 901 | if (ret) { |
| 902 | uid_t trigger_owner_uid; |
| 903 | const char *trigger_name; |
| 904 | |
| 905 | get_trigger_info_for_log(trigger, &trigger_name, |
| 906 | &trigger_owner_uid); |
| 907 | ERR("Failed to clear event notifier counter value for trigger: counter uid = %d, trigger name = '%s', trigger owner uid = %d", |
| 908 | (int) uid_entry->node.key, trigger_name, |
| 909 | (int) trigger_owner_uid); |
| 910 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 911 | goto end; |
| 912 | } |
| 913 | } |
| 914 | |
| 915 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 916 | end: |
| 917 | rcu_read_unlock(); |
| 918 | return status; |
| 919 | } |
| 920 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 921 | |
| 922 | static |
| 923 | enum event_notifier_error_accounting_status |
| 924 | event_notifier_error_accounting_kernel_clear( |
| 925 | const struct lttng_trigger *trigger) |
| 926 | { |
| 927 | int ret; |
| 928 | uint64_t error_counter_index; |
| 929 | enum event_notifier_error_accounting_status status; |
| 930 | struct lttng_kernel_abi_counter_clear counter_clear = {}; |
| 931 | |
| 932 | status = get_error_counter_index_for_token(&kernel_state, |
| 933 | lttng_trigger_get_tracer_token(trigger), |
| 934 | &error_counter_index); |
| 935 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 936 | uid_t trigger_owner_uid; |
| 937 | const char *trigger_name; |
| 938 | |
| 939 | get_trigger_info_for_log( |
| 940 | trigger, &trigger_name, &trigger_owner_uid); |
| 941 | |
| 942 | ERR("Failed to get event notifier error counter index: trigger owner uid = %d, trigger name = '%s', status = '%s'", |
| 943 | trigger_owner_uid, trigger_name, |
| 944 | error_accounting_status_str(status)); |
| 945 | goto end; |
| 946 | } |
| 947 | |
| 948 | counter_clear.index.number_dimensions = 1; |
| 949 | counter_clear.index.dimension_indexes[0] = error_counter_index; |
| 950 | |
| 951 | ret = kernctl_counter_clear( |
| 952 | kernel_error_accounting_entry.error_counter_fd, |
| 953 | &counter_clear); |
| 954 | if (ret) { |
| 955 | uid_t trigger_owner_uid; |
| 956 | const char *trigger_name; |
| 957 | |
| 958 | get_trigger_info_for_log( |
| 959 | trigger, &trigger_name, &trigger_owner_uid); |
| 960 | |
| 961 | ERR("Failed to clear kernel event notifier error counter: trigger owner uid = %d, trigger name = '%s'", |
| 962 | trigger_owner_uid, trigger_name); |
| 963 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 964 | goto end; |
| 965 | } |
| 966 | |
| 967 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 968 | end: |
| 969 | return status; |
| 970 | } |
| 971 | |
| 972 | enum event_notifier_error_accounting_status |
| 973 | event_notifier_error_accounting_register_kernel( |
| 974 | int kernel_event_notifier_group_fd) |
| 975 | { |
| 976 | int error_counter_fd = -1, ret; |
| 977 | enum event_notifier_error_accounting_status status; |
| 978 | const struct lttng_kernel_abi_counter_conf error_counter_conf = { |
| 979 | .arithmetic = LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR, |
| 980 | .bitness = sizeof(void *) == sizeof(uint32_t) ? |
| 981 | LTTNG_KERNEL_ABI_COUNTER_BITNESS_32 : |
| 982 | LTTNG_KERNEL_ABI_COUNTER_BITNESS_64, |
| 983 | .global_sum_step = 0, |
| 984 | .number_dimensions = 1, |
| 985 | .dimensions[0].size = kernel_state.number_indices, |
| 986 | .dimensions[0].has_underflow = false, |
| 987 | .dimensions[0].has_overflow = false, |
| 988 | }; |
| 989 | |
| 990 | ret = kernctl_create_event_notifier_group_error_counter( |
| 991 | kernel_event_notifier_group_fd, &error_counter_conf); |
| 992 | if (ret < 0) { |
| 993 | PERROR("Failed to create event notifier group error counter through kernel ioctl: kernel_event_notifier_group_fd = %d", |
| 994 | kernel_event_notifier_group_fd); |
| 995 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 996 | goto error; |
| 997 | } |
| 998 | |
| 999 | error_counter_fd = ret; |
| 1000 | |
| 1001 | /* Prevent fd duplication after execlp(). */ |
| 1002 | ret = fcntl(error_counter_fd, F_SETFD, FD_CLOEXEC); |
| 1003 | if (ret < 0) { |
| 1004 | PERROR("Failed to set FD_CLOEXEC flag on event notifier error counter file descriptor: error_counter_fd = %d", |
| 1005 | error_counter_fd); |
| 1006 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 1007 | goto error; |
| 1008 | } |
| 1009 | |
| 1010 | DBG("Created kernel event notifier group error counter: fd = %d", |
| 1011 | error_counter_fd); |
| 1012 | |
| 1013 | kernel_error_accounting_entry.error_counter_fd = |
| 1014 | error_counter_fd; |
| 1015 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1016 | |
| 1017 | error: |
| 1018 | return status; |
| 1019 | } |
| 1020 | |
| 1021 | static |
| 1022 | enum event_notifier_error_accounting_status create_error_counter_index_for_token( |
| 1023 | struct error_accounting_state *state, uint64_t tracer_token, |
| 1024 | uint64_t *error_counter_index) |
| 1025 | { |
| 1026 | struct index_ht_entry *index_entry; |
| 1027 | enum lttng_index_allocator_status index_alloc_status; |
| 1028 | uint64_t local_error_counter_index; |
| 1029 | enum event_notifier_error_accounting_status status; |
| 1030 | |
| 1031 | LTTNG_ASSERT(state); |
| 1032 | |
| 1033 | /* Allocate a new index for that counter. */ |
| 1034 | index_alloc_status = lttng_index_allocator_alloc(state->index_allocator, |
| 1035 | &local_error_counter_index); |
| 1036 | switch (index_alloc_status) { |
| 1037 | case LTTNG_INDEX_ALLOCATOR_STATUS_EMPTY: |
| 1038 | DBG("No indices left in the configured event notifier error counter: " |
| 1039 | "number-of-indices = %"PRIu64, |
| 1040 | lttng_index_allocator_get_index_count( |
| 1041 | state->index_allocator)); |
| 1042 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE; |
| 1043 | goto end; |
| 1044 | case LTTNG_INDEX_ALLOCATOR_STATUS_OK: |
| 1045 | break; |
| 1046 | default: |
| 1047 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 1048 | goto end; |
| 1049 | } |
| 1050 | |
| 1051 | index_entry = zmalloc(sizeof(*index_entry)); |
| 1052 | if (index_entry == NULL) { |
| 1053 | PERROR("Failed to allocate event notifier error counter hash table entry"); |
| 1054 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
| 1055 | goto end; |
| 1056 | } |
| 1057 | |
| 1058 | index_entry->error_counter_index = local_error_counter_index; |
| 1059 | lttng_ht_node_init_u64(&index_entry->node, tracer_token); |
| 1060 | lttng_ht_add_unique_u64(state->indices_ht, &index_entry->node); |
| 1061 | |
| 1062 | DBG("Allocated error counter index for tracer token: tracer token = %" PRIu64 ", index = %" PRIu64, |
| 1063 | tracer_token, local_error_counter_index); |
| 1064 | *error_counter_index = local_error_counter_index; |
| 1065 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1066 | end: |
| 1067 | return status; |
| 1068 | } |
| 1069 | |
| 1070 | enum event_notifier_error_accounting_status |
| 1071 | event_notifier_error_accounting_register_event_notifier( |
| 1072 | const struct lttng_trigger *trigger, |
| 1073 | uint64_t *error_counter_index) |
| 1074 | { |
| 1075 | enum event_notifier_error_accounting_status status; |
| 1076 | uint64_t local_error_counter_index; |
| 1077 | struct error_accounting_state *state; |
| 1078 | |
| 1079 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
| 1080 | case LTTNG_DOMAIN_KERNEL: |
| 1081 | state = &kernel_state; |
| 1082 | break; |
| 1083 | case LTTNG_DOMAIN_UST: |
| 1084 | case LTTNG_DOMAIN_PYTHON: |
| 1085 | case LTTNG_DOMAIN_JUL: |
| 1086 | case LTTNG_DOMAIN_LOG4J: |
| 1087 | state = &ust_state; |
| 1088 | break; |
| 1089 | default: |
| 1090 | abort(); |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * Check if this event notifier already has a error counter index |
| 1095 | * assigned. |
| 1096 | */ |
| 1097 | status = get_error_counter_index_for_token(state, |
| 1098 | lttng_trigger_get_tracer_token(trigger), |
| 1099 | &local_error_counter_index); |
| 1100 | switch (status) { |
| 1101 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND: |
| 1102 | { |
| 1103 | uid_t trigger_owner_uid; |
| 1104 | const char *trigger_name; |
| 1105 | |
| 1106 | get_trigger_info_for_log( |
| 1107 | trigger, &trigger_name, &trigger_owner_uid); |
| 1108 | |
| 1109 | DBG("Event notifier error counter index not found for tracer token (allocating a new one): trigger name = '%s', trigger owner uid = %d, tracer token = %" PRIu64, |
| 1110 | trigger_name, trigger_owner_uid, |
| 1111 | lttng_trigger_get_tracer_token(trigger)); |
| 1112 | |
| 1113 | status = create_error_counter_index_for_token(state, |
| 1114 | lttng_trigger_get_tracer_token(trigger), |
| 1115 | &local_error_counter_index); |
| 1116 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 1117 | ERR("Error creating index for token: status = %s, trigger name = '%s', trigger owner uid = %d", |
| 1118 | error_accounting_status_str(status), |
| 1119 | trigger_name, trigger_owner_uid); |
| 1120 | goto end; |
| 1121 | } |
| 1122 | /* fall-through. */ |
| 1123 | } |
| 1124 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: |
| 1125 | *error_counter_index = local_error_counter_index; |
| 1126 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1127 | break; |
| 1128 | default: |
| 1129 | break; |
| 1130 | } |
| 1131 | |
| 1132 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 1133 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
| 1134 | case LTTNG_DOMAIN_UST: |
| 1135 | case LTTNG_DOMAIN_PYTHON: |
| 1136 | case LTTNG_DOMAIN_JUL: |
| 1137 | case LTTNG_DOMAIN_LOG4J: |
| 1138 | pthread_mutex_lock(&the_event_notifier_counter.lock); |
| 1139 | the_event_notifier_counter.count++; |
| 1140 | if (the_event_notifier_counter.count == 1) { |
| 1141 | /* |
| 1142 | * On the first event notifier, we get a reference to |
| 1143 | * every existing UID entries. This ensures that the |
| 1144 | * entries are kept around if there are still |
| 1145 | * registered event notifiers but no apps. |
| 1146 | */ |
| 1147 | get_ref_all_ust_error_accounting_entry(); |
| 1148 | } |
| 1149 | pthread_mutex_unlock(&the_event_notifier_counter.lock); |
| 1150 | break; |
| 1151 | default: |
| 1152 | break; |
| 1153 | } |
| 1154 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 1155 | |
| 1156 | |
| 1157 | end: |
| 1158 | return status; |
| 1159 | } |
| 1160 | |
| 1161 | static |
| 1162 | enum event_notifier_error_accounting_status |
| 1163 | event_notifier_error_accounting_kernel_get_count( |
| 1164 | const struct lttng_trigger *trigger, uint64_t *count) |
| 1165 | { |
| 1166 | struct lttng_kernel_abi_counter_aggregate counter_aggregate = {}; |
| 1167 | enum event_notifier_error_accounting_status status; |
| 1168 | uint64_t error_counter_index; |
| 1169 | int ret; |
| 1170 | |
| 1171 | status = get_error_counter_index_for_token(&kernel_state, |
| 1172 | lttng_trigger_get_tracer_token(trigger), |
| 1173 | &error_counter_index); |
| 1174 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 1175 | ERR("Error getting index for token: status=%s", |
| 1176 | error_accounting_status_str(status)); |
| 1177 | goto end; |
| 1178 | } |
| 1179 | |
| 1180 | counter_aggregate.index.number_dimensions = 1; |
| 1181 | counter_aggregate.index.dimension_indexes[0] = error_counter_index; |
| 1182 | |
| 1183 | LTTNG_ASSERT(kernel_error_accounting_entry.error_counter_fd); |
| 1184 | |
| 1185 | ret = kernctl_counter_get_aggregate_value( |
| 1186 | kernel_error_accounting_entry.error_counter_fd, |
| 1187 | &counter_aggregate); |
| 1188 | if (ret || counter_aggregate.value.value < 0) { |
| 1189 | uid_t trigger_owner_uid; |
| 1190 | const char *trigger_name; |
| 1191 | |
| 1192 | get_trigger_info_for_log(trigger, &trigger_name, |
| 1193 | &trigger_owner_uid); |
| 1194 | |
| 1195 | if (counter_aggregate.value.value < 0) { |
| 1196 | ERR("Invalid negative event notifier error counter value: trigger owner = %d, trigger name = '%s', value = %" PRId64, |
| 1197 | trigger_owner_uid, trigger_name, |
| 1198 | counter_aggregate.value.value); |
| 1199 | } else { |
| 1200 | ERR("Failed to getting event notifier error count: trigger owner = %d, trigger name = '%s', ret = %d", |
| 1201 | trigger_owner_uid, trigger_name, ret); |
| 1202 | } |
| 1203 | |
| 1204 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
| 1205 | goto end; |
| 1206 | } |
| 1207 | |
| 1208 | /* Error count can't be negative. */ |
| 1209 | LTTNG_ASSERT(counter_aggregate.value.value >= 0); |
| 1210 | *count = (uint64_t) counter_aggregate.value.value; |
| 1211 | |
| 1212 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1213 | |
| 1214 | end: |
| 1215 | return status; |
| 1216 | } |
| 1217 | |
| 1218 | enum event_notifier_error_accounting_status |
| 1219 | event_notifier_error_accounting_get_count( |
| 1220 | const struct lttng_trigger *trigger, uint64_t *count) |
| 1221 | { |
| 1222 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
| 1223 | case LTTNG_DOMAIN_KERNEL: |
| 1224 | return event_notifier_error_accounting_kernel_get_count( |
| 1225 | trigger, count); |
| 1226 | case LTTNG_DOMAIN_UST: |
| 1227 | case LTTNG_DOMAIN_PYTHON: |
| 1228 | case LTTNG_DOMAIN_JUL: |
| 1229 | case LTTNG_DOMAIN_LOG4J: |
| 1230 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 1231 | return event_notifier_error_accounting_ust_get_count(trigger, |
| 1232 | count); |
| 1233 | #else |
| 1234 | *count = 0; |
| 1235 | return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1236 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 1237 | default: |
| 1238 | abort(); |
| 1239 | } |
| 1240 | } |
| 1241 | |
| 1242 | static |
| 1243 | enum event_notifier_error_accounting_status |
| 1244 | event_notifier_error_accounting_clear(const struct lttng_trigger *trigger) |
| 1245 | { |
| 1246 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
| 1247 | case LTTNG_DOMAIN_KERNEL: |
| 1248 | return event_notifier_error_accounting_kernel_clear(trigger); |
| 1249 | case LTTNG_DOMAIN_UST: |
| 1250 | case LTTNG_DOMAIN_PYTHON: |
| 1251 | case LTTNG_DOMAIN_JUL: |
| 1252 | case LTTNG_DOMAIN_LOG4J: |
| 1253 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 1254 | return event_notifier_error_accounting_ust_clear(trigger); |
| 1255 | #else |
| 1256 | return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
| 1257 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 1258 | default: |
| 1259 | abort(); |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | static void free_index_ht_entry(struct rcu_head *head) |
| 1264 | { |
| 1265 | struct index_ht_entry *entry = caa_container_of(head, |
| 1266 | struct index_ht_entry, rcu_head); |
| 1267 | |
| 1268 | free(entry); |
| 1269 | } |
| 1270 | |
| 1271 | void event_notifier_error_accounting_unregister_event_notifier( |
| 1272 | const struct lttng_trigger *trigger) |
| 1273 | { |
| 1274 | struct lttng_ht_iter iter; |
| 1275 | struct lttng_ht_node_u64 *node; |
| 1276 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); |
| 1277 | enum event_notifier_error_accounting_status status; |
| 1278 | struct error_accounting_state *state; |
| 1279 | |
| 1280 | status = event_notifier_error_accounting_clear(trigger); |
| 1281 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 1282 | /* Trigger details already logged by callee on error. */ |
| 1283 | ERR("Failed to clear event notifier error counter during unregistration of event notifier: status = '%s'", |
| 1284 | error_accounting_status_str(status)); |
| 1285 | goto end; |
| 1286 | } |
| 1287 | |
| 1288 | rcu_read_lock(); |
| 1289 | |
| 1290 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
| 1291 | case LTTNG_DOMAIN_KERNEL: |
| 1292 | state = &kernel_state; |
| 1293 | break; |
| 1294 | #ifdef HAVE_LIBLTTNG_UST_CTL |
| 1295 | case LTTNG_DOMAIN_UST: |
| 1296 | case LTTNG_DOMAIN_PYTHON: |
| 1297 | case LTTNG_DOMAIN_JUL: |
| 1298 | case LTTNG_DOMAIN_LOG4J: |
| 1299 | state = &ust_state; |
| 1300 | |
| 1301 | pthread_mutex_lock(&the_event_notifier_counter.lock); |
| 1302 | the_event_notifier_counter.count--; |
| 1303 | if (the_event_notifier_counter.count == 0) { |
| 1304 | |
| 1305 | /* |
| 1306 | * When unregistering the last event notifier, put one |
| 1307 | * reference to every uid entries on the behalf of all |
| 1308 | * event notifiers. |
| 1309 | */ |
| 1310 | put_ref_all_ust_error_accounting_entry(); |
| 1311 | } |
| 1312 | |
| 1313 | pthread_mutex_unlock(&the_event_notifier_counter.lock); |
| 1314 | |
| 1315 | break; |
| 1316 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
| 1317 | default: |
| 1318 | abort(); |
| 1319 | } |
| 1320 | |
| 1321 | lttng_ht_lookup(state->indices_ht, &tracer_token, &iter); |
| 1322 | node = lttng_ht_iter_get_node_u64(&iter); |
| 1323 | if (node) { |
| 1324 | int del_ret; |
| 1325 | struct index_ht_entry *index_entry = caa_container_of( |
| 1326 | node, typeof(*index_entry), node); |
| 1327 | enum lttng_index_allocator_status index_alloc_status; |
| 1328 | |
| 1329 | index_alloc_status = lttng_index_allocator_release( |
| 1330 | state->index_allocator, |
| 1331 | index_entry->error_counter_index); |
| 1332 | if (index_alloc_status != LTTNG_INDEX_ALLOCATOR_STATUS_OK) { |
| 1333 | uid_t trigger_owner_uid; |
| 1334 | const char *trigger_name; |
| 1335 | |
| 1336 | get_trigger_info_for_log(trigger, &trigger_name, |
| 1337 | &trigger_owner_uid); |
| 1338 | |
| 1339 | ERR("Failed to release event notifier error counter index: index = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d", |
| 1340 | index_entry->error_counter_index, |
| 1341 | trigger_name, (int) trigger_owner_uid); |
| 1342 | /* Don't exit, perform the rest of the clean-up. */ |
| 1343 | } |
| 1344 | |
| 1345 | del_ret = lttng_ht_del(state->indices_ht, &iter); |
| 1346 | LTTNG_ASSERT(!del_ret); |
| 1347 | call_rcu(&index_entry->rcu_head, free_index_ht_entry); |
| 1348 | } |
| 1349 | |
| 1350 | end: |
| 1351 | rcu_read_unlock(); |
| 1352 | } |
| 1353 | |
| 1354 | void event_notifier_error_accounting_fini(void) |
| 1355 | { |
| 1356 | if (kernel_error_accounting_entry.error_counter_fd) { |
| 1357 | const int ret = close(kernel_error_accounting_entry.error_counter_fd); |
| 1358 | |
| 1359 | if (ret) { |
| 1360 | PERROR("Failed to close kernel event notifier error counter"); |
| 1361 | } |
| 1362 | } |
| 1363 | |
| 1364 | lttng_ht_destroy(error_counter_uid_ht); |
| 1365 | |
| 1366 | fini_error_accounting_state(&kernel_state); |
| 1367 | fini_error_accounting_state(&ust_state); |
| 1368 | } |