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