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90aa04a1 FD |
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> | |
533a90fb | 13 | #include <pthread.h> |
90aa04a1 FD |
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> | |
533a90fb | 19 | #include <common/shm.h> |
90aa04a1 FD |
20 | #include <lttng/trigger/trigger-internal.h> |
21 | ||
22 | #include "event-notifier-error-accounting.h" | |
533a90fb FD |
23 | #include "lttng-ust-error.h" |
24 | #include "ust-app.h" | |
90aa04a1 FD |
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 | ||
761ffce2 FD |
34 | struct ust_error_accounting_entry { |
35 | uid_t uid; | |
a5a21280 | 36 | struct urcu_ref ref; |
533a90fb FD |
37 | struct lttng_ht_node_u64 node; |
38 | struct rcu_head rcu_head; | |
b623cb6a | 39 | struct lttng_ust_ctl_daemon_counter *daemon_counter; |
533a90fb | 40 | /* |
a5a21280 FD |
41 | * Those `lttng_ust_abi_object_data` are anonymous handles to the |
42 | * counters objects. | |
533a90fb FD |
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. | |
b623cb6a | 45 | * e.g. `lttng_ust_ctl_release_object(-1, data)`; |
533a90fb FD |
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 | ||
761ffce2 | 52 | struct kernel_error_accounting_entry { |
a5a21280 | 53 | int error_counter_fd; |
90aa04a1 FD |
54 | }; |
55 | ||
a5a21280 | 56 | static struct kernel_error_accounting_entry kernel_error_accounting_entry; |
90aa04a1 | 57 | |
533a90fb FD |
58 | /* Hashtable mapping uid to error_account_entry. */ |
59 | static struct lttng_ht *error_counter_uid_ht; | |
60 | ||
761ffce2 FD |
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; | |
90aa04a1 | 70 | |
533a90fb FD |
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: | |
0efb2ad7 | 82 | *trigger_name = "(anonymous)"; |
533a90fb FD |
83 | break; |
84 | default: | |
85 | abort(); | |
86 | } | |
87 | ||
88 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
89 | trigger_owner_uid); | |
90 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
91 | } | |
92 | ||
90aa04a1 FD |
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"; | |
533a90fb FD |
108 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD: |
109 | return "APP_DEAD"; | |
90aa04a1 FD |
110 | default: |
111 | abort(); | |
112 | } | |
113 | } | |
114 | ||
a5a21280 FD |
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++) { | |
b623cb6a | 130 | lttng_ust_ctl_release_object(-1, entry->cpu_counters[i]); |
a5a21280 FD |
131 | free(entry->cpu_counters[i]); |
132 | } | |
133 | ||
134 | free(entry->cpu_counters); | |
135 | ||
b623cb6a | 136 | lttng_ust_ctl_release_object(-1, entry->counter); |
a5a21280 FD |
137 | free(entry->counter); |
138 | ||
b623cb6a | 139 | lttng_ust_ctl_destroy_counter(entry->daemon_counter); |
a5a21280 FD |
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 | ||
761ffce2 | 215 | static |
90aa04a1 | 216 | enum event_notifier_error_accounting_status |
761ffce2 FD |
217 | init_error_accounting_state(struct error_accounting_state *state, |
218 | uint64_t index_count) | |
90aa04a1 FD |
219 | { |
220 | enum event_notifier_error_accounting_status status; | |
221 | ||
761ffce2 FD |
222 | 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"); | |
90aa04a1 | 229 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
761ffce2 | 230 | goto end; |
90aa04a1 FD |
231 | } |
232 | ||
761ffce2 FD |
233 | state->indices_ht = lttng_ht_new(ERROR_COUNTER_INDEX_HT_INITIAL_SIZE, |
234 | LTTNG_HT_TYPE_U64); | |
235 | if (!state->indices_ht) { | |
533a90fb FD |
236 | ERR("Failed to allocate error counter indices hash table"); |
237 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; | |
761ffce2 FD |
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 | 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; | |
533a90fb FD |
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"); | |
90aa04a1 | 288 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; |
761ffce2 | 289 | goto error_uid_ht; |
90aa04a1 FD |
290 | } |
291 | ||
90aa04a1 | 292 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
761ffce2 | 293 | goto end; |
90aa04a1 | 294 | |
761ffce2 FD |
295 | error_uid_ht: |
296 | fini_error_accounting_state(&ust_state); | |
297 | error_ust_state: | |
298 | fini_error_accounting_state(&kernel_state); | |
299 | end: | |
90aa04a1 FD |
300 | return status; |
301 | } | |
302 | ||
a5a21280 FD |
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 | */ | |
90aa04a1 FD |
307 | static |
308 | enum event_notifier_error_accounting_status get_error_counter_index_for_token( | |
761ffce2 FD |
309 | struct error_accounting_state *state, uint64_t tracer_token, |
310 | uint64_t *error_counter_index) | |
90aa04a1 FD |
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(); | |
761ffce2 | 318 | lttng_ht_lookup(state->indices_ht, &tracer_token, &iter); |
90aa04a1 FD |
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 | ||
533a90fb | 333 | #ifdef HAVE_LIBLTTNG_UST_CTL |
a5a21280 FD |
334 | /* |
335 | * Find the entry for this app's UID, the caller acquires a reference if the | |
336 | * entry is found. | |
337 | */ | |
533a90fb | 338 | static |
a5a21280 FD |
339 | struct ust_error_accounting_entry *ust_error_accounting_entry_find( |
340 | struct lttng_ht *uid_ht, const struct ust_app *app) | |
533a90fb | 341 | { |
761ffce2 | 342 | struct ust_error_accounting_entry *entry; |
533a90fb FD |
343 | struct lttng_ht_node_u64 *node; |
344 | struct lttng_ht_iter iter; | |
345 | uint64_t key = app->uid; | |
346 | ||
a5a21280 | 347 | lttng_ht_lookup(uid_ht, &key, &iter); |
533a90fb FD |
348 | node = lttng_ht_iter_get_node_u64(&iter); |
349 | if(node == NULL) { | |
350 | entry = NULL; | |
351 | } else { | |
a5a21280 FD |
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 | } | |
533a90fb FD |
361 | } |
362 | ||
363 | return entry; | |
364 | } | |
365 | ||
a5a21280 FD |
366 | /* |
367 | * Create the entry for this app's UID, the caller acquires a reference to the | |
368 | * entry, | |
369 | */ | |
533a90fb | 370 | static |
a5a21280 FD |
371 | struct ust_error_accounting_entry *ust_error_accounting_entry_create( |
372 | struct lttng_ht *uid_ht, const struct ust_app *app) | |
533a90fb | 373 | { |
a5a21280 | 374 | int i, ret, *cpu_counter_fds = NULL; |
b623cb6a | 375 | struct lttng_ust_ctl_daemon_counter *daemon_counter; |
533a90fb | 376 | struct lttng_ust_abi_object_data *counter, **cpu_counters; |
761ffce2 | 377 | struct ust_error_accounting_entry *entry = NULL; |
b623cb6a | 378 | const struct lttng_ust_ctl_counter_dimension dimension = { |
761ffce2 | 379 | .size = ust_state.number_indices, |
533a90fb FD |
380 | .has_underflow = false, |
381 | .has_overflow = false, | |
382 | }; | |
383 | ||
761ffce2 | 384 | entry = zmalloc(sizeof(struct ust_error_accounting_entry)); |
533a90fb FD |
385 | if (!entry) { |
386 | PERROR("Failed to allocate event notifier error acounting entry") | |
387 | goto error; | |
388 | } | |
389 | ||
a5a21280 | 390 | urcu_ref_init(&entry->ref); |
761ffce2 | 391 | entry->uid = app->uid; |
b623cb6a | 392 | entry->nr_counter_cpu_fds = lttng_ust_ctl_get_nr_cpu_per_counter(); |
761ffce2 | 393 | |
533a90fb FD |
394 | cpu_counter_fds = zmalloc(entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds)); |
395 | if (!cpu_counter_fds) { | |
396 | PERROR("Failed to allocate event notifier error counter file descriptors array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu", | |
397 | (int) app->uid, app->name, (int) app->pid, | |
398 | entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds)); | |
533a90fb FD |
399 | goto error_counter_cpu_fds_alloc; |
400 | } | |
401 | ||
402 | /* Initialize to an invalid fd value to closes fds in case of error. */ | |
403 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
404 | cpu_counter_fds[i] = -1; | |
405 | } | |
406 | ||
74f286be | 407 | cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
533a90fb FD |
408 | if (!cpu_counters) { |
409 | 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", | |
410 | (int) app->uid, app->name, (int) app->pid, | |
74f286be | 411 | entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
533a90fb FD |
412 | goto error_counter_cpus_alloc; |
413 | } | |
414 | ||
415 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
416 | cpu_counter_fds[i] = shm_create_anonymous("event-notifier-error-accounting"); | |
417 | if (cpu_counter_fds[i] == -1) { | |
418 | ERR("Failed to create event notifier error accounting shared memory for application user: application uid = %d, pid = %d, application name = '%s'", | |
419 | (int) app->uid, (int) app->pid, app->name); | |
420 | goto error_shm_alloc; | |
421 | } | |
422 | } | |
423 | ||
424 | /* | |
425 | * Ownership of the file descriptors transferred to the ustctl object. | |
426 | */ | |
b623cb6a | 427 | daemon_counter = lttng_ust_ctl_create_counter(1, &dimension, 0, -1, |
533a90fb | 428 | entry->nr_counter_cpu_fds, cpu_counter_fds, |
b623cb6a MJ |
429 | LTTNG_UST_CTL_COUNTER_BITNESS_32, |
430 | LTTNG_UST_CTL_COUNTER_ARITHMETIC_MODULAR, | |
431 | LTTNG_UST_CTL_COUNTER_ALLOC_PER_CPU, | |
533a90fb FD |
432 | false); |
433 | if (!daemon_counter) { | |
434 | goto error_create_daemon_counter; | |
435 | } | |
436 | ||
b623cb6a | 437 | ret = lttng_ust_ctl_create_counter_data(daemon_counter, &counter); |
533a90fb FD |
438 | if (ret) { |
439 | ERR("Failed to create userspace tracer counter data for application user: uid = %d, pid = %d, application name = '%s'", | |
440 | (int) app->uid, (int) app->pid, app->name); | |
441 | goto error_create_counter_data; | |
442 | } | |
443 | ||
444 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
b623cb6a | 445 | ret = lttng_ust_ctl_create_counter_cpu_data(daemon_counter, i, |
533a90fb FD |
446 | &cpu_counters[i]); |
447 | if (ret) { | |
448 | ERR("Failed to create userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'", | |
449 | (int) app->uid, (int) app->pid, | |
450 | app->name); | |
451 | goto error_create_counter_cpu_data; | |
452 | } | |
453 | } | |
454 | ||
455 | entry->daemon_counter = daemon_counter; | |
456 | entry->counter = counter; | |
457 | entry->cpu_counters = cpu_counters; | |
458 | ||
a5a21280 | 459 | lttng_ht_node_init_u64(&entry->node, entry->uid); |
533a90fb FD |
460 | lttng_ht_add_unique_u64(error_counter_uid_ht, &entry->node); |
461 | ||
462 | goto end; | |
463 | ||
464 | error_create_counter_cpu_data: | |
465 | /* Teardown any allocated cpu counters. */ | |
466 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
467 | if (!cpu_counters[i]) { | |
468 | /* | |
469 | * Early-exit when error occurred before all cpu | |
470 | * counters could be initialized. | |
471 | */ | |
472 | break; | |
473 | } | |
474 | ||
b623cb6a | 475 | lttng_ust_ctl_release_object(-1, cpu_counters[i]); |
533a90fb FD |
476 | free(cpu_counters[i]); |
477 | } | |
478 | ||
b623cb6a | 479 | lttng_ust_ctl_release_object(-1, entry->counter); |
533a90fb FD |
480 | free(entry->counter); |
481 | error_create_counter_data: | |
b623cb6a | 482 | lttng_ust_ctl_destroy_counter(daemon_counter); |
533a90fb FD |
483 | error_create_daemon_counter: |
484 | error_shm_alloc: | |
485 | /* Error occured before per-cpu SHMs were handed-off to ustctl. */ | |
486 | if (cpu_counter_fds) { | |
487 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
488 | if (cpu_counter_fds[i] < 0) { | |
489 | /* | |
490 | * Early-exit when error occurred before all cpu | |
491 | * counter shm fds could be initialized. | |
492 | */ | |
493 | break; | |
494 | } | |
495 | ||
496 | ret = close(cpu_counter_fds[i]); | |
497 | if (ret) { | |
a5a21280 FD |
498 | PERROR("Failed to close error counter per-CPU shm file descriptor: fd = %d", |
499 | cpu_counter_fds[i]); | |
533a90fb FD |
500 | } |
501 | } | |
502 | } | |
503 | ||
504 | free(cpu_counters); | |
505 | error_counter_cpus_alloc: | |
506 | error_counter_cpu_fds_alloc: | |
507 | free(entry); | |
508 | error: | |
509 | entry = NULL; | |
510 | end: | |
511 | free(cpu_counter_fds); | |
512 | return entry; | |
513 | } | |
514 | ||
515 | static | |
516 | enum event_notifier_error_accounting_status send_counter_data_to_ust( | |
517 | struct ust_app *app, | |
518 | struct lttng_ust_abi_object_data *new_counter) | |
519 | { | |
520 | int ret; | |
521 | enum event_notifier_error_accounting_status status; | |
522 | ||
523 | /* Attach counter to trigger group. */ | |
524 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 525 | ret = lttng_ust_ctl_send_counter_data_to_ust(app->sock, |
533a90fb FD |
526 | app->event_notifier_group.object->handle, new_counter); |
527 | pthread_mutex_unlock(&app->sock_lock); | |
528 | if (ret < 0) { | |
529 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
530 | ERR("Failed to send counter data to application: application name = '%s', pid = %d, ret = %d", | |
531 | app->name, app->pid, ret); | |
532 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
533 | } else { | |
534 | DBG3("Failed to send counter data to application (application is dead): application name = '%s', pid = %d, ret = %d", | |
535 | app->name, app->pid, ret); | |
536 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD; | |
537 | } | |
538 | ||
539 | goto end; | |
540 | } | |
541 | ||
542 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
543 | end: | |
544 | return status; | |
545 | } | |
546 | ||
547 | static | |
548 | enum event_notifier_error_accounting_status send_counter_cpu_data_to_ust( | |
549 | struct ust_app *app, | |
550 | struct lttng_ust_abi_object_data *counter, | |
551 | struct lttng_ust_abi_object_data *counter_cpu) | |
552 | { | |
553 | int ret; | |
554 | enum event_notifier_error_accounting_status status; | |
555 | ||
556 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 557 | ret = lttng_ust_ctl_send_counter_cpu_data_to_ust(app->sock, |
533a90fb FD |
558 | counter, counter_cpu); |
559 | pthread_mutex_unlock(&app->sock_lock); | |
560 | if (ret < 0) { | |
561 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
562 | ERR("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d", | |
563 | app->name, app->pid, ret); | |
564 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
565 | } else { | |
566 | DBG3("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d", | |
567 | app->name, app->pid, ret); | |
568 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD; | |
569 | } | |
570 | ||
571 | goto end; | |
572 | } | |
573 | ||
574 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
575 | end: | |
576 | return status; | |
577 | } | |
578 | ||
579 | enum event_notifier_error_accounting_status | |
580 | event_notifier_error_accounting_register_app(struct ust_app *app) | |
581 | { | |
582 | int ret; | |
583 | uint64_t i; | |
584 | struct lttng_ust_abi_object_data *new_counter; | |
761ffce2 | 585 | struct ust_error_accounting_entry *entry; |
533a90fb FD |
586 | enum event_notifier_error_accounting_status status; |
587 | struct lttng_ust_abi_object_data **cpu_counters; | |
588 | ||
589 | /* | |
590 | * Check if we already have a error counter for the user id of this | |
591 | * app. If not, create one. | |
592 | */ | |
593 | rcu_read_lock(); | |
a5a21280 | 594 | entry = ust_error_accounting_entry_find(error_counter_uid_ht, app); |
533a90fb | 595 | if (entry == NULL) { |
a5a21280 FD |
596 | /* |
597 | * Take the event notifier counter lock before creating the new | |
598 | * entry to ensure that no event notifier is registered between | |
599 | * the the entry creation and event notifier count check. | |
600 | */ | |
601 | pthread_mutex_lock(&the_event_notifier_counter.lock); | |
602 | ||
603 | entry = ust_error_accounting_entry_create(error_counter_uid_ht, | |
604 | app); | |
533a90fb FD |
605 | if (!entry) { |
606 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
a5a21280 FD |
607 | pthread_mutex_unlock(&the_event_notifier_counter.lock); |
608 | goto error_creating_entry; | |
609 | } | |
610 | ||
611 | /* | |
612 | * We just created a new UID entry, If there are event | |
613 | * notifiers already registered, take one reference on their | |
614 | * behalf. | |
615 | */ | |
616 | if (the_event_notifier_counter.count > 0) { | |
617 | ust_error_accounting_entry_get(entry); | |
533a90fb | 618 | } |
a5a21280 FD |
619 | |
620 | pthread_mutex_unlock(&the_event_notifier_counter.lock); | |
533a90fb FD |
621 | } |
622 | ||
623 | /* Duplicate counter object data. */ | |
b623cb6a | 624 | ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter, |
533a90fb FD |
625 | entry->counter); |
626 | if (ret) { | |
627 | ERR("Failed to duplicate event notifier error accounting counter for application user: application uid = %d, pid = %d, application name = '%s'", | |
628 | (int) app->uid, (int) app->pid, app->name); | |
629 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
a5a21280 | 630 | goto error_duplicate_counter; |
533a90fb FD |
631 | } |
632 | ||
633 | status = send_counter_data_to_ust(app, new_counter); | |
634 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
cd9c532c FD |
635 | if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) { |
636 | goto error_send_counter_data; | |
637 | } | |
638 | ||
533a90fb FD |
639 | ERR("Failed to send counter data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'", |
640 | error_accounting_status_str(status), | |
641 | (int) app->uid, (int) app->pid, app->name); | |
642 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
643 | goto error_send_counter_data; | |
644 | } | |
645 | ||
477b83a4 | 646 | cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *)); |
533a90fb FD |
647 | if (!cpu_counters) { |
648 | 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", | |
649 | (int) app->uid, app->name, (int) app->pid, | |
650 | entry->nr_counter_cpu_fds * sizeof(**cpu_counters)); | |
651 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; | |
652 | goto error_allocate_cpu_counters; | |
653 | } | |
654 | ||
655 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
656 | struct lttng_ust_abi_object_data *new_counter_cpu = NULL; | |
657 | ||
b623cb6a | 658 | ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter_cpu, |
533a90fb FD |
659 | entry->cpu_counters[i]); |
660 | if (ret) { | |
661 | ERR("Failed to duplicate userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'", | |
662 | (int) app->uid, (int) app->pid, | |
663 | app->name); | |
664 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; | |
665 | goto error_duplicate_cpu_counter; | |
666 | } | |
667 | ||
668 | cpu_counters[i] = new_counter_cpu; | |
669 | ||
670 | status = send_counter_cpu_data_to_ust(app, new_counter, | |
671 | new_counter_cpu); | |
672 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
cd9c532c FD |
673 | if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) { |
674 | goto error_send_cpu_counter_data; | |
675 | } | |
676 | ||
533a90fb FD |
677 | ERR("Failed to send counter cpu data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'", |
678 | error_accounting_status_str(status), | |
679 | (int) app->uid, (int) app->pid, | |
680 | app->name); | |
681 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
682 | goto error_send_cpu_counter_data; | |
683 | } | |
684 | } | |
685 | ||
686 | app->event_notifier_group.counter = new_counter; | |
687 | new_counter = NULL; | |
688 | app->event_notifier_group.nr_counter_cpu = entry->nr_counter_cpu_fds; | |
689 | app->event_notifier_group.counter_cpu = cpu_counters; | |
690 | cpu_counters = NULL; | |
691 | goto end; | |
692 | ||
533a90fb FD |
693 | error_send_cpu_counter_data: |
694 | error_duplicate_cpu_counter: | |
695 | /* Teardown any duplicated cpu counters. */ | |
696 | for (i = 0; i < entry->nr_counter_cpu_fds; i++) { | |
697 | if (!cpu_counters[i]) { | |
698 | /* | |
699 | * Early-exit when error occurred before all cpu | |
700 | * counters could be initialized. | |
701 | */ | |
702 | break; | |
703 | } | |
704 | ||
b623cb6a | 705 | lttng_ust_ctl_release_object(-1, cpu_counters[i]); |
533a90fb FD |
706 | free(cpu_counters[i]); |
707 | } | |
708 | ||
a55f8ad1 JG |
709 | free(cpu_counters); |
710 | ||
5d650dcd | 711 | error_allocate_cpu_counters: |
533a90fb | 712 | error_send_counter_data: |
b623cb6a | 713 | lttng_ust_ctl_release_object(-1, new_counter); |
533a90fb | 714 | free(new_counter); |
a5a21280 FD |
715 | error_duplicate_counter: |
716 | ust_error_accounting_entry_put(entry); | |
717 | error_creating_entry: | |
718 | app->event_notifier_group.counter = NULL; | |
533a90fb FD |
719 | end: |
720 | rcu_read_unlock(); | |
721 | return status; | |
722 | } | |
723 | ||
724 | enum event_notifier_error_accounting_status | |
725 | event_notifier_error_accounting_unregister_app(struct ust_app *app) | |
726 | { | |
727 | enum event_notifier_error_accounting_status status; | |
761ffce2 | 728 | struct ust_error_accounting_entry *entry; |
533a90fb FD |
729 | int i; |
730 | ||
731 | rcu_read_lock(); | |
a5a21280 FD |
732 | |
733 | /* If an error occurred during app registration no entry was created. */ | |
734 | if (!app->event_notifier_group.counter) { | |
735 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
736 | goto end; | |
737 | } | |
738 | ||
739 | entry = ust_error_accounting_entry_find(error_counter_uid_ht, app); | |
533a90fb FD |
740 | if (entry == NULL) { |
741 | ERR("Failed to find event notitifier error accounting entry on application teardown: pid = %d, application name = '%s'", | |
742 | app->pid, app->name); | |
743 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
744 | goto end; | |
a5a21280 FD |
745 | } else { |
746 | /* | |
747 | * Put the entry twice as we acquired a reference from the | |
748 | * `ust_error_accounting_entry_find()` above. | |
749 | */ | |
750 | ust_error_accounting_entry_put(entry); | |
751 | ust_error_accounting_entry_put(entry); | |
533a90fb FD |
752 | } |
753 | ||
754 | for (i = 0; i < app->event_notifier_group.nr_counter_cpu; i++) { | |
b623cb6a | 755 | lttng_ust_ctl_release_object(app->sock, |
533a90fb FD |
756 | app->event_notifier_group.counter_cpu[i]); |
757 | free(app->event_notifier_group.counter_cpu[i]); | |
758 | } | |
759 | ||
760 | free(app->event_notifier_group.counter_cpu); | |
761 | ||
b623cb6a | 762 | lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.counter); |
533a90fb FD |
763 | free(app->event_notifier_group.counter); |
764 | ||
765 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
766 | end: | |
767 | rcu_read_unlock(); | |
768 | return status; | |
769 | } | |
770 | ||
771 | static | |
772 | enum event_notifier_error_accounting_status | |
773 | event_notifier_error_accounting_ust_get_count( | |
774 | const struct lttng_trigger *trigger, uint64_t *count) | |
775 | { | |
776 | struct lttng_ht_iter iter; | |
761ffce2 | 777 | struct ust_error_accounting_entry *uid_entry; |
533a90fb FD |
778 | uint64_t error_counter_index, global_sum = 0; |
779 | enum event_notifier_error_accounting_status status; | |
780 | size_t dimension_indexes[1]; | |
781 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); | |
761ffce2 FD |
782 | uid_t trigger_owner_uid; |
783 | const char *trigger_name; | |
533a90fb | 784 | |
533a90fb FD |
785 | |
786 | rcu_read_lock(); | |
787 | ||
761ffce2 FD |
788 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); |
789 | ||
a5a21280 | 790 | status = get_error_counter_index_for_token(&ust_state, tracer_token, |
533a90fb FD |
791 | &error_counter_index); |
792 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
533a90fb FD |
793 | |
794 | ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s", | |
795 | tracer_token, trigger_name, | |
796 | (int) trigger_owner_uid, | |
797 | error_accounting_status_str(status)); | |
798 | goto end; | |
799 | } | |
800 | ||
801 | dimension_indexes[0] = error_counter_index; | |
802 | ||
761ffce2 FD |
803 | /* |
804 | * Iterate over all the UID entries. | |
805 | * We aggregate the value of all uid entries regardless of if the uid | |
806 | * matches the trigger's uid because a user that is allowed to register | |
807 | * a trigger to a given sessiond is also allowed to create an event | |
808 | * notifier on all apps that this sessiond is aware of. | |
809 | */ | |
533a90fb FD |
810 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
811 | uid_entry, node.node) { | |
812 | int ret; | |
813 | int64_t local_value = 0; | |
814 | bool overflow = false, underflow = false; | |
815 | ||
b623cb6a | 816 | ret = lttng_ust_ctl_counter_aggregate(uid_entry->daemon_counter, |
533a90fb FD |
817 | dimension_indexes, &local_value, &overflow, |
818 | &underflow); | |
819 | if (ret || local_value < 0) { | |
533a90fb FD |
820 | if (ret) { |
821 | ERR("Failed to aggregate event notifier error counter values of trigger: trigger name = '%s', trigger owner uid = %d", | |
822 | trigger_name, | |
823 | (int) trigger_owner_uid); | |
824 | } else if (local_value < 0) { | |
825 | ERR("Negative event notifier error counter value encountered during aggregation: trigger name = '%s', trigger owner uid = %d, value = %" PRId64, | |
826 | trigger_name, | |
827 | (int) trigger_owner_uid, | |
828 | local_value); | |
829 | } else { | |
830 | abort(); | |
831 | } | |
832 | ||
833 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
834 | goto end; | |
835 | } | |
836 | ||
837 | /* Cast is safe as negative values are checked-for above. */ | |
838 | global_sum += (uint64_t) local_value; | |
533a90fb FD |
839 | } |
840 | ||
841 | *count = global_sum; | |
842 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
843 | ||
844 | end: | |
845 | rcu_read_unlock(); | |
846 | return status; | |
847 | } | |
848 | ||
849 | static | |
850 | enum event_notifier_error_accounting_status event_notifier_error_accounting_ust_clear( | |
851 | const struct lttng_trigger *trigger) | |
852 | { | |
853 | struct lttng_ht_iter iter; | |
761ffce2 | 854 | struct ust_error_accounting_entry *uid_entry; |
533a90fb FD |
855 | uint64_t error_counter_index; |
856 | enum event_notifier_error_accounting_status status; | |
857 | size_t dimension_index; | |
858 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); | |
859 | ||
533a90fb | 860 | rcu_read_lock(); |
a5a21280 | 861 | status = get_error_counter_index_for_token(&ust_state, tracer_token, |
533a90fb FD |
862 | &error_counter_index); |
863 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
864 | uid_t trigger_owner_uid; | |
865 | const char *trigger_name; | |
866 | ||
867 | get_trigger_info_for_log(trigger, &trigger_name, | |
868 | &trigger_owner_uid); | |
869 | ||
870 | ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s", | |
871 | tracer_token, trigger_name, | |
872 | (int) trigger_owner_uid, | |
873 | error_accounting_status_str(status)); | |
874 | goto end; | |
875 | } | |
876 | ||
877 | dimension_index = error_counter_index; | |
878 | ||
a5a21280 FD |
879 | /* |
880 | * Go over all error counters (ignoring uid) as a trigger (and trigger | |
881 | * errors) can be generated from any applications that this session | |
882 | * daemon is managing. | |
883 | */ | |
533a90fb FD |
884 | cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter, |
885 | uid_entry, node.node) { | |
b623cb6a | 886 | const int ret = lttng_ust_ctl_counter_clear(uid_entry->daemon_counter, |
533a90fb FD |
887 | &dimension_index); |
888 | ||
889 | if (ret) { | |
890 | uid_t trigger_owner_uid; | |
891 | const char *trigger_name; | |
892 | ||
893 | get_trigger_info_for_log(trigger, &trigger_name, | |
894 | &trigger_owner_uid); | |
895 | ERR("Failed to clear event notifier counter value for trigger: counter uid = %d, trigger name = '%s', trigger owner uid = %d", | |
896 | (int) uid_entry->node.key, trigger_name, | |
897 | (int) trigger_owner_uid); | |
898 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
899 | goto end; | |
900 | } | |
901 | } | |
902 | ||
903 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
904 | end: | |
905 | rcu_read_unlock(); | |
906 | return status; | |
907 | } | |
908 | #endif /* HAVE_LIBLTTNG_UST_CTL */ | |
909 | ||
90aa04a1 FD |
910 | static |
911 | enum event_notifier_error_accounting_status | |
912 | event_notifier_error_accounting_kernel_clear( | |
913 | const struct lttng_trigger *trigger) | |
914 | { | |
915 | int ret; | |
916 | uint64_t error_counter_index; | |
917 | enum event_notifier_error_accounting_status status; | |
918 | struct lttng_kernel_counter_clear counter_clear = {}; | |
919 | ||
a5a21280 | 920 | status = get_error_counter_index_for_token(&kernel_state, |
90aa04a1 FD |
921 | lttng_trigger_get_tracer_token(trigger), |
922 | &error_counter_index); | |
923 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
924 | uid_t trigger_owner_uid; | |
925 | const char *trigger_name; | |
90aa04a1 | 926 | |
533a90fb FD |
927 | get_trigger_info_for_log( |
928 | trigger, &trigger_name, &trigger_owner_uid); | |
929 | ||
930 | ERR("Failed to get event notifier error counter index: trigger owner uid = %d, trigger name = '%s', status = '%s'", | |
931 | trigger_owner_uid, trigger_name, | |
932 | error_accounting_status_str(status)); | |
90aa04a1 FD |
933 | goto end; |
934 | } | |
935 | ||
936 | counter_clear.index.number_dimensions = 1; | |
937 | counter_clear.index.dimension_indexes[0] = error_counter_index; | |
938 | ||
939 | ret = kernctl_counter_clear( | |
a5a21280 | 940 | kernel_error_accounting_entry.error_counter_fd, |
90aa04a1 FD |
941 | &counter_clear); |
942 | if (ret) { | |
533a90fb FD |
943 | uid_t trigger_owner_uid; |
944 | const char *trigger_name; | |
945 | ||
946 | get_trigger_info_for_log( | |
947 | trigger, &trigger_name, &trigger_owner_uid); | |
948 | ||
949 | ERR("Failed to clear kernel event notifier error counter: trigger owner uid = %d, trigger name = '%s'", | |
950 | trigger_owner_uid, trigger_name); | |
90aa04a1 FD |
951 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; |
952 | goto end; | |
953 | } | |
954 | ||
955 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
956 | end: | |
957 | return status; | |
958 | } | |
959 | ||
960 | enum event_notifier_error_accounting_status | |
961 | event_notifier_error_accounting_register_kernel( | |
962 | int kernel_event_notifier_group_fd) | |
963 | { | |
964 | int error_counter_fd = -1, ret; | |
965 | enum event_notifier_error_accounting_status status; | |
966 | const struct lttng_kernel_counter_conf error_counter_conf = { | |
967 | .arithmetic = LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR, | |
968 | .bitness = sizeof(void *) == sizeof(uint32_t) ? | |
969 | LTTNG_KERNEL_COUNTER_BITNESS_32 : | |
970 | LTTNG_KERNEL_COUNTER_BITNESS_64, | |
971 | .global_sum_step = 0, | |
972 | .number_dimensions = 1, | |
761ffce2 | 973 | .dimensions[0].size = kernel_state.number_indices, |
90aa04a1 FD |
974 | .dimensions[0].has_underflow = false, |
975 | .dimensions[0].has_overflow = false, | |
976 | }; | |
977 | ||
978 | ret = kernctl_create_event_notifier_group_error_counter( | |
979 | kernel_event_notifier_group_fd, &error_counter_conf); | |
980 | if (ret < 0) { | |
981 | PERROR("Failed to create event notifier group error counter through kernel ioctl: kernel_event_notifier_group_fd = %d", | |
982 | kernel_event_notifier_group_fd); | |
983 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
984 | goto error; | |
985 | } | |
986 | ||
987 | error_counter_fd = ret; | |
988 | ||
989 | /* Prevent fd duplication after execlp(). */ | |
990 | ret = fcntl(error_counter_fd, F_SETFD, FD_CLOEXEC); | |
991 | if (ret < 0) { | |
992 | PERROR("Failed to set FD_CLOEXEC flag on event notifier error counter file descriptor: error_counter_fd = %d", | |
993 | error_counter_fd); | |
994 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
995 | goto error; | |
996 | } | |
997 | ||
998 | DBG("Created kernel event notifier group error counter: fd = %d", | |
999 | error_counter_fd); | |
1000 | ||
a5a21280 | 1001 | kernel_error_accounting_entry.error_counter_fd = |
90aa04a1 FD |
1002 | error_counter_fd; |
1003 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
1004 | ||
1005 | error: | |
1006 | return status; | |
1007 | } | |
1008 | ||
1009 | static | |
1010 | enum event_notifier_error_accounting_status create_error_counter_index_for_token( | |
761ffce2 FD |
1011 | struct error_accounting_state *state, uint64_t tracer_token, |
1012 | uint64_t *error_counter_index) | |
90aa04a1 FD |
1013 | { |
1014 | struct index_ht_entry *index_entry; | |
1015 | enum lttng_index_allocator_status index_alloc_status; | |
1016 | uint64_t local_error_counter_index; | |
1017 | enum event_notifier_error_accounting_status status; | |
1018 | ||
761ffce2 FD |
1019 | assert(state); |
1020 | ||
90aa04a1 | 1021 | /* Allocate a new index for that counter. */ |
761ffce2 | 1022 | index_alloc_status = lttng_index_allocator_alloc(state->index_allocator, |
90aa04a1 FD |
1023 | &local_error_counter_index); |
1024 | switch (index_alloc_status) { | |
1025 | case LTTNG_INDEX_ALLOCATOR_STATUS_EMPTY: | |
1026 | DBG("No indices left in the configured event notifier error counter: " | |
1027 | "number-of-indices = %"PRIu64, | |
1028 | lttng_index_allocator_get_index_count( | |
761ffce2 | 1029 | state->index_allocator)); |
90aa04a1 FD |
1030 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE; |
1031 | goto end; | |
1032 | case LTTNG_INDEX_ALLOCATOR_STATUS_OK: | |
1033 | break; | |
1034 | default: | |
1035 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
1036 | goto end; | |
1037 | } | |
1038 | ||
1039 | index_entry = zmalloc(sizeof(*index_entry)); | |
1040 | if (index_entry == NULL) { | |
1041 | PERROR("Failed to allocate event notifier error counter hash table entry"); | |
1042 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM; | |
1043 | goto end; | |
1044 | } | |
1045 | ||
1046 | index_entry->error_counter_index = local_error_counter_index; | |
1047 | lttng_ht_node_init_u64(&index_entry->node, tracer_token); | |
761ffce2 | 1048 | lttng_ht_add_unique_u64(state->indices_ht, &index_entry->node); |
90aa04a1 FD |
1049 | |
1050 | DBG("Allocated error counter index for tracer token: tracer token = %" PRIu64 ", index = %" PRIu64, | |
1051 | tracer_token, local_error_counter_index); | |
1052 | *error_counter_index = local_error_counter_index; | |
1053 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
1054 | end: | |
1055 | return status; | |
1056 | } | |
1057 | ||
1058 | enum event_notifier_error_accounting_status | |
1059 | event_notifier_error_accounting_register_event_notifier( | |
1060 | const struct lttng_trigger *trigger, | |
1061 | uint64_t *error_counter_index) | |
1062 | { | |
1063 | enum event_notifier_error_accounting_status status; | |
1064 | uint64_t local_error_counter_index; | |
761ffce2 FD |
1065 | struct error_accounting_state *state; |
1066 | ||
1067 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { | |
1068 | case LTTNG_DOMAIN_KERNEL: | |
1069 | state = &kernel_state; | |
1070 | break; | |
1071 | case LTTNG_DOMAIN_UST: | |
1072 | state = &ust_state; | |
1073 | break; | |
1074 | default: | |
1075 | abort(); | |
1076 | } | |
90aa04a1 FD |
1077 | |
1078 | /* | |
1079 | * Check if this event notifier already has a error counter index | |
1080 | * assigned. | |
1081 | */ | |
761ffce2 | 1082 | status = get_error_counter_index_for_token(state, |
90aa04a1 FD |
1083 | lttng_trigger_get_tracer_token(trigger), |
1084 | &local_error_counter_index); | |
1085 | switch (status) { | |
1086 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND: | |
1087 | { | |
1088 | uid_t trigger_owner_uid; | |
1089 | const char *trigger_name; | |
90aa04a1 | 1090 | |
533a90fb FD |
1091 | get_trigger_info_for_log( |
1092 | trigger, &trigger_name, &trigger_owner_uid); | |
1093 | ||
1094 | 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, | |
1095 | trigger_name, trigger_owner_uid, | |
90aa04a1 | 1096 | lttng_trigger_get_tracer_token(trigger)); |
533a90fb | 1097 | |
761ffce2 | 1098 | status = create_error_counter_index_for_token(state, |
90aa04a1 FD |
1099 | lttng_trigger_get_tracer_token(trigger), |
1100 | &local_error_counter_index); | |
1101 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
533a90fb FD |
1102 | ERR("Error creating index for token: status = %s, trigger name = '%s', trigger owner uid = %d", |
1103 | error_accounting_status_str(status), | |
1104 | trigger_name, trigger_owner_uid); | |
90aa04a1 FD |
1105 | goto end; |
1106 | } | |
1107 | /* fall-through. */ | |
1108 | } | |
1109 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: | |
1110 | *error_counter_index = local_error_counter_index; | |
1111 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
1112 | break; | |
1113 | default: | |
1114 | break; | |
1115 | } | |
1116 | ||
a5a21280 FD |
1117 | #ifdef HAVE_LIBLTTNG_UST_CTL |
1118 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { | |
1119 | case LTTNG_DOMAIN_UST: | |
1120 | pthread_mutex_lock(&the_event_notifier_counter.lock); | |
1121 | the_event_notifier_counter.count++; | |
1122 | if (the_event_notifier_counter.count == 1) { | |
1123 | /* | |
1124 | * On the first event notifier, we get a reference to | |
1125 | * every existing UID entries. This ensures that the | |
1126 | * entries are kept around if there are still | |
1127 | * registered event notifiers but no apps. | |
1128 | */ | |
1129 | get_ref_all_ust_error_accounting_entry(); | |
1130 | } | |
1131 | pthread_mutex_unlock(&the_event_notifier_counter.lock); | |
1132 | break; | |
1133 | default: | |
1134 | break; | |
1135 | } | |
1136 | #endif /* HAVE_LIBLTTNG_UST_CTL */ | |
1137 | ||
1138 | ||
90aa04a1 FD |
1139 | end: |
1140 | return status; | |
1141 | } | |
1142 | ||
1143 | static | |
1144 | enum event_notifier_error_accounting_status | |
1145 | event_notifier_error_accounting_kernel_get_count( | |
1146 | const struct lttng_trigger *trigger, uint64_t *count) | |
1147 | { | |
1148 | struct lttng_kernel_counter_aggregate counter_aggregate = {}; | |
1149 | enum event_notifier_error_accounting_status status; | |
1150 | uint64_t error_counter_index; | |
1151 | int ret; | |
1152 | ||
a5a21280 | 1153 | status = get_error_counter_index_for_token(&kernel_state, |
761ffce2 FD |
1154 | lttng_trigger_get_tracer_token(trigger), |
1155 | &error_counter_index); | |
90aa04a1 | 1156 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
533a90fb FD |
1157 | ERR("Error getting index for token: status=%s", |
1158 | error_accounting_status_str(status)); | |
90aa04a1 FD |
1159 | goto end; |
1160 | } | |
1161 | ||
1162 | counter_aggregate.index.number_dimensions = 1; | |
1163 | counter_aggregate.index.dimension_indexes[0] = error_counter_index; | |
1164 | ||
a5a21280 | 1165 | assert(kernel_error_accounting_entry.error_counter_fd); |
90aa04a1 FD |
1166 | |
1167 | ret = kernctl_counter_get_aggregate_value( | |
a5a21280 | 1168 | kernel_error_accounting_entry.error_counter_fd, |
90aa04a1 FD |
1169 | &counter_aggregate); |
1170 | if (ret || counter_aggregate.value.value < 0) { | |
1171 | uid_t trigger_owner_uid; | |
1172 | const char *trigger_name; | |
533a90fb FD |
1173 | |
1174 | get_trigger_info_for_log(trigger, &trigger_name, | |
1175 | &trigger_owner_uid); | |
90aa04a1 FD |
1176 | |
1177 | if (counter_aggregate.value.value < 0) { | |
1178 | ERR("Invalid negative event notifier error counter value: trigger owner = %d, trigger name = '%s', value = %" PRId64, | |
1179 | trigger_owner_uid, trigger_name, | |
1180 | counter_aggregate.value.value); | |
1181 | } else { | |
1182 | ERR("Failed to getting event notifier error count: trigger owner = %d, trigger name = '%s', ret = %d", | |
1183 | trigger_owner_uid, trigger_name, ret); | |
1184 | } | |
1185 | ||
1186 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR; | |
1187 | goto end; | |
1188 | } | |
1189 | ||
1190 | /* Error count can't be negative. */ | |
1191 | assert(counter_aggregate.value.value >= 0); | |
1192 | *count = (uint64_t) counter_aggregate.value.value; | |
1193 | ||
1194 | status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; | |
1195 | ||
1196 | end: | |
1197 | return status; | |
1198 | } | |
1199 | ||
1200 | enum event_notifier_error_accounting_status | |
1201 | event_notifier_error_accounting_get_count( | |
1202 | const struct lttng_trigger *trigger, uint64_t *count) | |
1203 | { | |
1204 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { | |
1205 | case LTTNG_DOMAIN_KERNEL: | |
1206 | return event_notifier_error_accounting_kernel_get_count( | |
1207 | trigger, count); | |
1208 | case LTTNG_DOMAIN_UST: | |
533a90fb | 1209 | #ifdef HAVE_LIBLTTNG_UST_CTL |
761ffce2 FD |
1210 | return event_notifier_error_accounting_ust_get_count(trigger, |
1211 | count); | |
533a90fb | 1212 | #else |
43cee6f9 | 1213 | *count = 0; |
90aa04a1 | 1214 | return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
533a90fb | 1215 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
90aa04a1 FD |
1216 | default: |
1217 | abort(); | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | static | |
1222 | enum event_notifier_error_accounting_status | |
1223 | event_notifier_error_accounting_clear(const struct lttng_trigger *trigger) | |
1224 | { | |
1225 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { | |
1226 | case LTTNG_DOMAIN_KERNEL: | |
1227 | return event_notifier_error_accounting_kernel_clear(trigger); | |
1228 | case LTTNG_DOMAIN_UST: | |
533a90fb FD |
1229 | #ifdef HAVE_LIBLTTNG_UST_CTL |
1230 | return event_notifier_error_accounting_ust_clear(trigger); | |
1231 | #else | |
90aa04a1 | 1232 | return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK; |
533a90fb | 1233 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
90aa04a1 FD |
1234 | default: |
1235 | abort(); | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | static void free_index_ht_entry(struct rcu_head *head) | |
1240 | { | |
1241 | struct index_ht_entry *entry = caa_container_of(head, | |
1242 | struct index_ht_entry, rcu_head); | |
1243 | ||
1244 | free(entry); | |
1245 | } | |
1246 | ||
1247 | void event_notifier_error_accounting_unregister_event_notifier( | |
1248 | const struct lttng_trigger *trigger) | |
1249 | { | |
1250 | struct lttng_ht_iter iter; | |
1251 | struct lttng_ht_node_u64 *node; | |
533a90fb | 1252 | const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger); |
90aa04a1 | 1253 | enum event_notifier_error_accounting_status status; |
761ffce2 | 1254 | struct error_accounting_state *state; |
90aa04a1 FD |
1255 | |
1256 | status = event_notifier_error_accounting_clear(trigger); | |
1257 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
533a90fb FD |
1258 | /* Trigger details already logged by callee on error. */ |
1259 | ERR("Failed to clear event notifier error counter during unregistration of event notifier: status = '%s'", | |
1260 | error_accounting_status_str(status)); | |
a5a21280 | 1261 | goto end; |
90aa04a1 FD |
1262 | } |
1263 | ||
a5a21280 FD |
1264 | rcu_read_lock(); |
1265 | ||
761ffce2 FD |
1266 | switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) { |
1267 | case LTTNG_DOMAIN_KERNEL: | |
1268 | state = &kernel_state; | |
1269 | break; | |
a5a21280 | 1270 | #ifdef HAVE_LIBLTTNG_UST_CTL |
761ffce2 FD |
1271 | case LTTNG_DOMAIN_UST: |
1272 | state = &ust_state; | |
a5a21280 FD |
1273 | |
1274 | pthread_mutex_lock(&the_event_notifier_counter.lock); | |
1275 | the_event_notifier_counter.count--; | |
1276 | if (the_event_notifier_counter.count == 0) { | |
1277 | ||
1278 | /* | |
1279 | * When unregistering the last event notifier, put one | |
1280 | * reference to every uid entries on the behalf of all | |
1281 | * event notifiers. | |
1282 | */ | |
1283 | put_ref_all_ust_error_accounting_entry(); | |
1284 | } | |
1285 | ||
1286 | pthread_mutex_unlock(&the_event_notifier_counter.lock); | |
1287 | ||
761ffce2 | 1288 | break; |
a5a21280 | 1289 | #endif /* HAVE_LIBLTTNG_UST_CTL */ |
761ffce2 FD |
1290 | default: |
1291 | abort(); | |
1292 | } | |
1293 | ||
761ffce2 | 1294 | lttng_ht_lookup(state->indices_ht, &tracer_token, &iter); |
90aa04a1 | 1295 | node = lttng_ht_iter_get_node_u64(&iter); |
533a90fb | 1296 | if (node) { |
44d0e2f1 | 1297 | int del_ret; |
533a90fb FD |
1298 | struct index_ht_entry *index_entry = caa_container_of( |
1299 | node, typeof(*index_entry), node); | |
1300 | enum lttng_index_allocator_status index_alloc_status; | |
1301 | ||
90aa04a1 | 1302 | index_alloc_status = lttng_index_allocator_release( |
761ffce2 | 1303 | state->index_allocator, |
90aa04a1 FD |
1304 | index_entry->error_counter_index); |
1305 | if (index_alloc_status != LTTNG_INDEX_ALLOCATOR_STATUS_OK) { | |
533a90fb FD |
1306 | uid_t trigger_owner_uid; |
1307 | const char *trigger_name; | |
1308 | ||
1309 | get_trigger_info_for_log(trigger, &trigger_name, | |
1310 | &trigger_owner_uid); | |
1311 | ||
1312 | ERR("Failed to release event notifier error counter index: index = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d", | |
1313 | index_entry->error_counter_index, | |
1314 | trigger_name, (int) trigger_owner_uid); | |
1315 | /* Don't exit, perform the rest of the clean-up. */ | |
90aa04a1 FD |
1316 | } |
1317 | ||
761ffce2 | 1318 | del_ret = lttng_ht_del(state->indices_ht, &iter); |
44d0e2f1 | 1319 | assert(!del_ret); |
90aa04a1 FD |
1320 | call_rcu(&index_entry->rcu_head, free_index_ht_entry); |
1321 | } | |
1322 | ||
a5a21280 | 1323 | end: |
90aa04a1 FD |
1324 | rcu_read_unlock(); |
1325 | } | |
1326 | ||
1327 | void event_notifier_error_accounting_fini(void) | |
1328 | { | |
a5a21280 FD |
1329 | if (kernel_error_accounting_entry.error_counter_fd) { |
1330 | const int ret = close(kernel_error_accounting_entry.error_counter_fd); | |
90aa04a1 FD |
1331 | |
1332 | if (ret) { | |
1333 | PERROR("Failed to close kernel event notifier error counter"); | |
1334 | } | |
1335 | } | |
1336 | ||
533a90fb FD |
1337 | lttng_ht_destroy(error_counter_uid_ht); |
1338 | ||
761ffce2 FD |
1339 | fini_error_accounting_state(&kernel_state); |
1340 | fini_error_accounting_state(&ust_state); | |
90aa04a1 | 1341 | } |