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ust-abi: Clarify "size" field comment
[lttng-ust.git] / src / lib / lttng-ust / lttng-events.c
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1/*
2 * SPDX-License-Identifier: LGPL-2.1-only
3 *
4 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 *
6 * Holds LTTng per-session event registry.
7 */
8
9#define _LGPL_SOURCE
10#include <stdio.h>
11#include <assert.h>
12#include <errno.h>
13#include <limits.h>
14#include <pthread.h>
15#include <sys/shm.h>
16#include <sys/ipc.h>
17#include <stdint.h>
18#include <stddef.h>
19#include <inttypes.h>
20#include <time.h>
21#include <stdbool.h>
22#include <unistd.h>
23#include <dlfcn.h>
24#include <lttng/ust-endian.h>
25
26#include <urcu/arch.h>
27#include <urcu/compiler.h>
28#include <urcu/hlist.h>
29#include <urcu/list.h>
30#include <urcu/uatomic.h>
31
32#include <lttng/tracepoint.h>
33#include <lttng/ust-events.h>
34
35#include "common/logging.h"
36#include "common/macros.h"
37#include <lttng/ust-ctl.h>
38#include "common/ustcomm.h"
39#include "common/ust-fd.h"
40#include "common/dynamic-type.h"
41#include "common/ust-context-provider.h"
42
43#include "common/tracepoint.h"
44#include "common/strutils.h"
45#include "lttng-bytecode.h"
46#include "common/tracer.h"
47#include "lttng-tracer-core.h"
48#include "lttng-ust-statedump.h"
49#include "context-internal.h"
50#include "lib/lttng-ust/events.h"
51#include "common/ringbuffer/shm.h"
52#include "common/ringbuffer/frontend_types.h"
53#include "common/ringbuffer/frontend.h"
54#include "common/counter/counter.h"
55#include "common/jhash.h"
56#include <lttng/ust-abi.h>
57#include "context-provider-internal.h"
58
59/*
60 * All operations within this file are called by the communication
61 * thread, under ust_lock protection.
62 */
63
64static CDS_LIST_HEAD(sessions);
65static CDS_LIST_HEAD(event_notifier_groups);
66
67struct cds_list_head *lttng_get_sessions(void)
68{
69 return &sessions;
70}
71
72static void _lttng_event_destroy(struct lttng_ust_event_common *event);
73static void _lttng_enum_destroy(struct lttng_enum *_enum);
74
75static
76void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session *session);
77static
78void lttng_session_sync_event_enablers(struct lttng_ust_session *session);
79static
80void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
81static
82void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
83
84bool lttng_ust_validate_event_name(const struct lttng_ust_event_desc *desc)
85{
86 if (strlen(desc->probe_desc->provider_name) + 1 +
87 strlen(desc->event_name) >= LTTNG_UST_ABI_SYM_NAME_LEN)
88 return false;
89 return true;
90}
91
92void lttng_ust_format_event_name(const struct lttng_ust_event_desc *desc,
93 char *name)
94{
95 strcpy(name, desc->probe_desc->provider_name);
96 strcat(name, ":");
97 strcat(name, desc->event_name);
98}
99
100static
101void lttng_event_enabler_unsync(struct lttng_event_enabler_common *event_enabler)
102{
103 switch (event_enabler->enabler_type) {
104 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
105 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
106 {
107 struct lttng_event_enabler_session_common *event_enabler_session =
108 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
109 cds_list_move(&event_enabler->node,
110 &event_enabler_session->chan->session->priv->unsync_enablers_head);
111 break;
112 }
113 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
114 {
115 struct lttng_event_notifier_enabler *event_notifier_enabler =
116 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
117 cds_list_move(&event_enabler->node,
118 &event_notifier_enabler->group->unsync_enablers_head);
119 break;
120 }
121 default:
122 WARN_ON_ONCE(1);
123 }
124}
125
126static
127void lttng_session_unsync_enablers(struct lttng_ust_session *session)
128{
129 cds_list_splice(&session->priv->sync_enablers_head,
130 &session->priv->unsync_enablers_head);
131 CDS_INIT_LIST_HEAD(&session->priv->sync_enablers_head);
132}
133
134static
135void lttng_event_notifier_group_unsync_enablers(struct lttng_event_notifier_group *event_notifier_group)
136{
137 cds_list_splice(&event_notifier_group->sync_enablers_head,
138 &event_notifier_group->unsync_enablers_head);
139 CDS_INIT_LIST_HEAD(&event_notifier_group->sync_enablers_head);
140}
141
142/*
143 * Called with ust lock held.
144 */
145int lttng_session_active(void)
146{
147 struct lttng_ust_session_private *iter;
148
149 cds_list_for_each_entry(iter, &sessions, node) {
150 if (iter->pub->active)
151 return 1;
152 }
153 return 0;
154}
155
156static
157int lttng_loglevel_match(int loglevel,
158 unsigned int has_loglevel,
159 enum lttng_ust_abi_loglevel_type req_type,
160 int req_loglevel)
161{
162 if (!has_loglevel)
163 loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
164 switch (req_type) {
165 case LTTNG_UST_ABI_LOGLEVEL_RANGE:
166 if (loglevel <= req_loglevel
167 || (req_loglevel == -1 && loglevel <= LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG))
168 return 1;
169 else
170 return 0;
171 case LTTNG_UST_ABI_LOGLEVEL_SINGLE:
172 if (loglevel == req_loglevel
173 || (req_loglevel == -1 && loglevel <= LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG))
174 return 1;
175 else
176 return 0;
177 case LTTNG_UST_ABI_LOGLEVEL_ALL:
178 default:
179 if (loglevel <= LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG)
180 return 1;
181 else
182 return 0;
183 }
184}
185
186struct lttng_ust_session *lttng_session_create(void)
187{
188 struct lttng_ust_session *session;
189 struct lttng_ust_session_private *session_priv;
190 int i;
191
192 session = zmalloc(sizeof(struct lttng_ust_session));
193 if (!session)
194 return NULL;
195 session->struct_size = sizeof(struct lttng_ust_session);
196 session_priv = zmalloc(sizeof(struct lttng_ust_session_private));
197 if (!session_priv) {
198 free(session);
199 return NULL;
200 }
201 session->priv = session_priv;
202 session_priv->pub = session;
203 if (lttng_context_init_all(&session->priv->ctx)) {
204 free(session_priv);
205 free(session);
206 return NULL;
207 }
208 CDS_INIT_LIST_HEAD(&session->priv->chan_head);
209 CDS_INIT_LIST_HEAD(&session->priv->events_head);
210 CDS_INIT_LIST_HEAD(&session->priv->enums_head);
211 CDS_INIT_LIST_HEAD(&session->priv->unsync_enablers_head);
212 CDS_INIT_LIST_HEAD(&session->priv->sync_enablers_head);
213 CDS_INIT_LIST_HEAD(&session->priv->counters_head);
214 for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
215 CDS_INIT_HLIST_HEAD(&session->priv->events_name_ht.table[i]);
216 for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++)
217 CDS_INIT_HLIST_HEAD(&session->priv->enums_ht.table[i]);
218 cds_list_add(&session->priv->node, &sessions);
219 return session;
220}
221
222struct lttng_ust_channel_counter *lttng_ust_counter_create(
223 const char *counter_transport_name,
224 size_t number_dimensions,
225 const struct lttng_counter_dimension *dimensions,
226 int64_t global_sum_step,
227 bool coalesce_hits)
228{
229 struct lttng_counter_transport *counter_transport = NULL;
230 struct lttng_ust_channel_counter *counter = NULL;
231
232 counter_transport = lttng_counter_transport_find(counter_transport_name);
233 if (!counter_transport) {
234 goto notransport;
235 }
236 counter = counter_transport->ops.priv->counter_create(number_dimensions, dimensions,
237 global_sum_step, -1, 0, NULL, false);
238 if (!counter) {
239 goto create_error;
240 }
241 counter->ops = &counter_transport->ops;
242 counter->priv->parent.coalesce_hits = coalesce_hits;
243
244 return counter;
245
246create_error:
247notransport:
248 return NULL;
249}
250
251static
252void lttng_ust_counter_destroy(struct lttng_ust_channel_counter *counter)
253{
254 counter->ops->priv->counter_destroy(counter);
255}
256
257struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
258{
259 struct lttng_event_notifier_group *event_notifier_group;
260 int i;
261
262 event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group));
263 if (!event_notifier_group)
264 return NULL;
265
266 /* Add all contexts. */
267 if (lttng_context_init_all(&event_notifier_group->ctx)) {
268 free(event_notifier_group);
269 return NULL;
270 }
271
272 CDS_INIT_LIST_HEAD(&event_notifier_group->sync_enablers_head);
273 CDS_INIT_LIST_HEAD(&event_notifier_group->unsync_enablers_head);
274 CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
275 for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
276 CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
277
278 cds_list_add(&event_notifier_group->node, &event_notifier_groups);
279
280 return event_notifier_group;
281}
282
283/*
284 * Only used internally at session destruction.
285 */
286static
287void _lttng_channel_unmap(struct lttng_ust_channel_buffer *lttng_chan)
288{
289 struct lttng_ust_ring_buffer_channel *chan;
290 struct lttng_ust_shm_handle *handle;
291
292 cds_list_del(&lttng_chan->priv->node);
293 lttng_destroy_context(lttng_chan->priv->ctx);
294 chan = lttng_chan->priv->rb_chan;
295 handle = chan->handle;
296 channel_destroy(chan, handle, 0);
297 free(lttng_chan->parent);
298 free(lttng_chan->priv);
299 free(lttng_chan);
300}
301
302static
303void register_event(struct lttng_ust_event_common *event)
304{
305 int ret;
306 const struct lttng_ust_event_desc *desc;
307
308 assert(event->priv->registered == 0);
309 desc = event->priv->desc;
310 ret = lttng_ust_tp_probe_register_queue_release(desc->probe_desc->provider_name,
311 desc->event_name,
312 desc->tp_class->probe_callback,
313 event, desc->tp_class->signature);
314 WARN_ON_ONCE(ret);
315 if (!ret)
316 event->priv->registered = 1;
317}
318
319static
320void unregister_event(struct lttng_ust_event_common *event)
321{
322 int ret;
323 const struct lttng_ust_event_desc *desc;
324
325 assert(event->priv->registered == 1);
326 desc = event->priv->desc;
327 ret = lttng_ust_tp_probe_unregister_queue_release(desc->probe_desc->provider_name,
328 desc->event_name,
329 desc->tp_class->probe_callback,
330 event);
331 WARN_ON_ONCE(ret);
332 if (!ret)
333 event->priv->registered = 0;
334}
335
336static
337void _lttng_event_unregister(struct lttng_ust_event_common *event)
338{
339 if (event->priv->registered)
340 unregister_event(event);
341}
342
343void lttng_session_destroy(struct lttng_ust_session *session)
344{
345 struct lttng_ust_channel_buffer_private *chan_buffer, *tmpchan_buffer;
346 struct lttng_ust_channel_counter_private *chan_counter, *tmpchan_counter;
347 struct lttng_ust_event_common_private *event_priv, *tmpevent_priv;
348 struct lttng_enum *_enum, *tmp_enum;
349 struct lttng_event_enabler_common *event_enabler, *event_tmpenabler;
350
351 CMM_ACCESS_ONCE(session->active) = 0;
352 cds_list_for_each_entry(event_priv, &session->priv->events_head, node)
353 _lttng_event_unregister(event_priv->pub);
354 lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */
355 lttng_ust_tp_probe_prune_release_queue();
356 cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, &session->priv->unsync_enablers_head, node)
357 lttng_event_enabler_destroy(event_enabler);
358 cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, &session->priv->sync_enablers_head, node)
359 lttng_event_enabler_destroy(event_enabler);
360 cds_list_for_each_entry_safe(event_priv, tmpevent_priv, &session->priv->events_head, node)
361 _lttng_event_destroy(event_priv->pub);
362 cds_list_for_each_entry_safe(_enum, tmp_enum, &session->priv->enums_head, node)
363 _lttng_enum_destroy(_enum);
364 cds_list_for_each_entry_safe(chan_buffer, tmpchan_buffer, &session->priv->chan_head, node)
365 _lttng_channel_unmap(chan_buffer->pub);
366 cds_list_for_each_entry_safe(chan_counter, tmpchan_counter, &session->priv->counters_head, node) {
367 cds_list_del(&chan_counter->node);
368 lttng_ust_counter_destroy(chan_counter->pub);
369 }
370 cds_list_del(&session->priv->node);
371 lttng_destroy_context(session->priv->ctx);
372 free(session->priv);
373 free(session);
374}
375
376void lttng_event_notifier_group_destroy(
377 struct lttng_event_notifier_group *event_notifier_group)
378{
379 int close_ret;
380 struct lttng_event_enabler_common *event_enabler, *tmpevent_enabler;
381 struct lttng_ust_event_common_private *event_priv, *tmpevent_priv;
382
383 if (!event_notifier_group) {
384 return;
385 }
386
387 cds_list_for_each_entry(event_priv, &event_notifier_group->event_notifiers_head, node)
388 _lttng_event_unregister(event_priv->pub);
389
390 lttng_ust_urcu_synchronize_rcu();
391
392 cds_list_for_each_entry_safe(event_enabler, tmpevent_enabler, &event_notifier_group->sync_enablers_head, node)
393 lttng_event_enabler_destroy(event_enabler);
394 cds_list_for_each_entry_safe(event_enabler, tmpevent_enabler, &event_notifier_group->unsync_enablers_head, node)
395 lttng_event_enabler_destroy(event_enabler);
396 cds_list_for_each_entry_safe(event_priv, tmpevent_priv, &event_notifier_group->event_notifiers_head, node)
397 _lttng_event_destroy(event_priv->pub);
398
399 if (event_notifier_group->error_counter)
400 lttng_ust_counter_destroy(event_notifier_group->error_counter);
401
402 /* Close the notification fd to the listener of event_notifiers. */
403
404 lttng_ust_lock_fd_tracker();
405 close_ret = close(event_notifier_group->notification_fd);
406 if (!close_ret) {
407 lttng_ust_delete_fd_from_tracker(
408 event_notifier_group->notification_fd);
409 } else {
410 PERROR("close");
411 abort();
412 }
413 lttng_ust_unlock_fd_tracker();
414
415 cds_list_del(&event_notifier_group->node);
416 lttng_destroy_context(event_notifier_group->ctx);
417 free(event_notifier_group);
418}
419
420static
421int lttng_enum_create(const struct lttng_ust_enum_desc *desc,
422 struct lttng_ust_session *session)
423{
424 const char *enum_name = desc->name;
425 struct lttng_enum *_enum;
426 struct cds_hlist_head *head;
427 int ret = 0;
428 size_t name_len = strlen(enum_name);
429 uint32_t hash;
430 int notify_socket;
431
432 /* Check if this enum is already registered for this session. */
433 hash = jhash(enum_name, name_len, 0);
434 head = &session->priv->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
435
436 _enum = lttng_ust_enum_get_from_desc(session, desc);
437 if (_enum) {
438 ret = -EEXIST;
439 goto exist;
440 }
441
442 notify_socket = lttng_get_notify_socket(session->priv->owner);
443 if (notify_socket < 0) {
444 ret = notify_socket;
445 goto socket_error;
446 }
447
448 _enum = zmalloc(sizeof(*_enum));
449 if (!_enum) {
450 ret = -ENOMEM;
451 goto cache_error;
452 }
453 _enum->session = session;
454 _enum->desc = desc;
455
456 ret = ustcomm_register_enum(notify_socket,
457 session->priv->objd,
458 enum_name,
459 desc->nr_entries,
460 desc->entries,
461 &_enum->id);
462 if (ret < 0) {
463 DBG("Error (%d) registering enumeration to sessiond", ret);
464 goto sessiond_register_error;
465 }
466 cds_list_add(&_enum->node, &session->priv->enums_head);
467 cds_hlist_add_head(&_enum->hlist, head);
468 return 0;
469
470sessiond_register_error:
471 free(_enum);
472cache_error:
473socket_error:
474exist:
475 return ret;
476}
477
478static
479int lttng_create_enum_check(const struct lttng_ust_type_common *type,
480 struct lttng_ust_session *session)
481{
482 switch (type->type) {
483 case lttng_ust_type_enum:
484 {
485 const struct lttng_ust_enum_desc *enum_desc;
486 int ret;
487
488 enum_desc = lttng_ust_get_type_enum(type)->desc;
489 ret = lttng_enum_create(enum_desc, session);
490 if (ret && ret != -EEXIST) {
491 DBG("Unable to create enum error: (%d)", ret);
492 return ret;
493 }
494 break;
495 }
496 case lttng_ust_type_dynamic:
497 {
498 const struct lttng_ust_event_field *tag_field_generic;
499 const struct lttng_ust_enum_desc *enum_desc;
500 int ret;
501
502 tag_field_generic = lttng_ust_dynamic_type_tag_field();
503 enum_desc = lttng_ust_get_type_enum(tag_field_generic->type)->desc;
504 ret = lttng_enum_create(enum_desc, session);
505 if (ret && ret != -EEXIST) {
506 DBG("Unable to create enum error: (%d)", ret);
507 return ret;
508 }
509 break;
510 }
511 default:
512 /* TODO: nested types when they become supported. */
513 break;
514 }
515 return 0;
516}
517
518static
519int lttng_create_all_event_enums(struct lttng_event_enabler_common *event_enabler,
520 const struct lttng_ust_event_desc *desc)
521{
522 size_t nr_fields = desc->tp_class->nr_fields;
523 const struct lttng_ust_event_field * const *event_fields = desc->tp_class->fields;
524 struct lttng_ust_session *session;
525 size_t i;
526 int ret;
527
528 switch (event_enabler->enabler_type) {
529 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
530 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
531 {
532 struct lttng_event_enabler_session_common *event_enabler_session =
533 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
534
535 session = event_enabler_session->chan->session;
536 /* For each field, ensure enum is part of the session. */
537 for (i = 0; i < nr_fields; i++) {
538 const struct lttng_ust_type_common *type = event_fields[i]->type;
539
540 ret = lttng_create_enum_check(type, session);
541 if (ret)
542 return ret;
543 }
544 return 0;
545 }
546 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
547 return 0;
548 default:
549 return -EINVAL;
550 }
551}
552
553static
554int lttng_create_all_ctx_enums(size_t nr_fields,
555 struct lttng_ust_ctx_field *ctx_fields,
556 struct lttng_ust_session *session)
557{
558 size_t i;
559 int ret;
560
561 /* For each field, ensure enum is part of the session. */
562 for (i = 0; i < nr_fields; i++) {
563 const struct lttng_ust_type_common *type = ctx_fields[i].event_field->type;
564
565 ret = lttng_create_enum_check(type, session);
566 if (ret)
567 return ret;
568 }
569 return 0;
570}
571
572/*
573 * Ensure that a state-dump will be performed for this session at the end
574 * of the current handle_message().
575 */
576int lttng_session_statedump(struct lttng_ust_session *session)
577{
578 session->priv->statedump_pending = 1;
579 lttng_ust_sockinfo_session_enabled(session->priv->owner);
580 return 0;
581}
582
583int lttng_session_enable(struct lttng_ust_session *session)
584{
585 int ret = 0;
586 struct lttng_ust_channel_buffer_private *chan;
587 int notify_socket;
588
589 if (session->active) {
590 ret = -EBUSY;
591 goto end;
592 }
593
594 notify_socket = lttng_get_notify_socket(session->priv->owner);
595 if (notify_socket < 0)
596 return notify_socket;
597
598 /* Set transient enabler state to "enabled" */
599 session->priv->tstate = 1;
600
601 /* We need to sync enablers with session before activation. */
602 lttng_session_sync_event_enablers(session);
603
604 /*
605 * Snapshot the number of events per channel to know the type of header
606 * we need to use.
607 */
608 cds_list_for_each_entry(chan, &session->priv->chan_head, node) {
609 struct lttng_ust_ctx *ctx;
610 struct lttng_ust_ctx_field *fields = NULL;
611 size_t nr_fields = 0;
612 uint32_t chan_id;
613
614 /* don't change it if session stop/restart */
615 if (chan->header_type)
616 continue;
617 ctx = chan->ctx;
618 if (ctx) {
619 nr_fields = ctx->nr_fields;
620 fields = ctx->fields;
621 ret = lttng_create_all_ctx_enums(nr_fields, fields,
622 session);
623 if (ret < 0) {
624 DBG("Error (%d) adding enum to session", ret);
625 return ret;
626 }
627 }
628 ret = ustcomm_register_channel(notify_socket,
629 session,
630 session->priv->objd,
631 chan->parent.objd,
632 nr_fields,
633 fields,
634 &chan_id,
635 &chan->header_type);
636 if (ret) {
637 DBG("Error (%d) registering channel to sessiond", ret);
638 return ret;
639 }
640 if (chan_id != chan->id) {
641 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
642 chan_id, chan->id);
643 return -EINVAL;
644 }
645 }
646
647 /* Set atomically the state to "active" */
648 CMM_ACCESS_ONCE(session->active) = 1;
649 CMM_ACCESS_ONCE(session->priv->been_active) = 1;
650
651 ret = lttng_session_statedump(session);
652 if (ret)
653 return ret;
654end:
655 return ret;
656}
657
658int lttng_session_disable(struct lttng_ust_session *session)
659{
660 int ret = 0;
661
662 if (!session->active) {
663 ret = -EBUSY;
664 goto end;
665 }
666 /* Set atomically the state to "inactive" */
667 CMM_ACCESS_ONCE(session->active) = 0;
668
669 /* Set transient enabler state to "disabled" */
670 session->priv->tstate = 0;
671 lttng_session_sync_event_enablers(session);
672end:
673 return ret;
674}
675
676int lttng_channel_enable(struct lttng_ust_channel_common *lttng_channel)
677{
678 int ret = 0;
679
680 if (lttng_channel->enabled) {
681 ret = -EBUSY;
682 goto end;
683 }
684 /* Set transient enabler state to "enabled" */
685 lttng_channel->priv->tstate = 1;
686 lttng_session_sync_event_enablers(lttng_channel->session);
687 /* Set atomically the state to "enabled" */
688 CMM_ACCESS_ONCE(lttng_channel->enabled) = 1;
689end:
690 return ret;
691}
692
693int lttng_channel_disable(struct lttng_ust_channel_common *lttng_channel)
694{
695 int ret = 0;
696
697 if (!lttng_channel->enabled) {
698 ret = -EBUSY;
699 goto end;
700 }
701 /* Set atomically the state to "disabled" */
702 CMM_ACCESS_ONCE(lttng_channel->enabled) = 0;
703 /* Set transient enabler state to "enabled" */
704 lttng_channel->priv->tstate = 0;
705 lttng_session_sync_event_enablers(lttng_channel->session);
706end:
707 return ret;
708}
709
710static inline
711struct cds_hlist_head *borrow_hash_table_bucket(
712 struct cds_hlist_head *hash_table,
713 unsigned int hash_table_size,
714 const char *name)
715{
716 size_t name_len;
717 uint32_t hash;
718
719 name_len = strlen(name);
720
721 hash = jhash(name, name_len, 0);
722 return &hash_table[hash & (hash_table_size - 1)];
723}
724
725static
726int format_event_key(struct lttng_event_enabler_common *event_enabler, char *key_string,
727 const char *provider_name, const char *event_name)
728{
729 struct lttng_event_counter_enabler *event_counter_enabler;
730 const struct lttng_counter_key_dimension *dim;
731 size_t i, left = LTTNG_KEY_TOKEN_STRING_LEN_MAX;
732 const struct lttng_counter_key *key;
733
734 if (event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_COUNTER) {
735 return 0;
736 }
737 event_counter_enabler = caa_container_of(event_enabler, struct lttng_event_counter_enabler, parent.parent);
738 key = &event_counter_enabler->key;
739 if (!key->nr_dimensions)
740 return 0;
741 /* Currently event keys can only be specified on a single dimension. */
742 if (key->nr_dimensions != 1)
743 return -EINVAL;
744 dim = &key->key_dimensions[0];
745 /* Currently only tokens keys are supported. */
746 if (dim->key_type != LTTNG_KEY_TYPE_TOKENS)
747 return -EINVAL;
748 for (i = 0; i < dim->u.tokens.nr_key_tokens; i++) {
749 const struct lttng_key_token *token = &dim->u.tokens.key_tokens[i];
750 size_t token_len;
751 const char *str;
752
753 switch (token->type) {
754 case LTTNG_KEY_TOKEN_STRING:
755 str = token->arg.string;
756 break;
757 case LTTNG_KEY_TOKEN_EVENT_NAME:
758 str = event_name;
759 break;
760 case LTTNG_KEY_TOKEN_PROVIDER_NAME:
761 str = provider_name;
762 break;
763 default:
764 return -EINVAL;
765 }
766 token_len = strlen(str);
767 if (token_len >= left)
768 return -EINVAL;
769 strcat(key_string, str);
770 left -= token_len;
771 }
772 return 0;
773}
774
775static
776bool match_event_key(struct lttng_ust_event_common *event, const char *key_string)
777{
778 switch (event->type) {
779 case LTTNG_UST_EVENT_TYPE_RECORDER: /* Fall-through */
780 case LTTNG_UST_EVENT_TYPE_NOTIFIER:
781 return true;
782
783 case LTTNG_UST_EVENT_TYPE_COUNTER:
784 {
785 struct lttng_ust_event_counter_private *event_counter_priv =
786 caa_container_of(event->priv, struct lttng_ust_event_counter_private, parent.parent);
787
788 if (key_string[0] == '\0')
789 return true;
790 return !strcmp(key_string, event_counter_priv->key);
791 }
792
793 default:
794 WARN_ON_ONCE(1);
795 return false;
796 }
797}
798
799static
800bool match_event_session_token(struct lttng_ust_event_session_common_private *event_session_priv,
801 uint64_t token)
802{
803 if (event_session_priv->chan->priv->coalesce_hits)
804 return true;
805 if (event_session_priv->parent.user_token == token)
806 return true;
807 return false;
808}
809
810static
811struct lttng_ust_event_common *lttng_ust_event_alloc(struct lttng_event_enabler_common *event_enabler,
812 const struct lttng_ust_event_desc *desc,
813 const char *key_string)
814{
815
816 switch (event_enabler->enabler_type) {
817 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
818 {
819 struct lttng_event_recorder_enabler *event_recorder_enabler =
820 caa_container_of(event_enabler, struct lttng_event_recorder_enabler, parent.parent);
821 struct lttng_ust_event_recorder *event_recorder;
822 struct lttng_ust_event_recorder_private *event_recorder_priv;
823
824 event_recorder = zmalloc(sizeof(struct lttng_ust_event_recorder));
825 if (!event_recorder)
826 return NULL;
827 event_recorder->struct_size = sizeof(struct lttng_ust_event_recorder);
828
829 event_recorder->parent = zmalloc(sizeof(struct lttng_ust_event_common));
830 if (!event_recorder->parent) {
831 free(event_recorder);
832 return NULL;
833 }
834 event_recorder->parent->struct_size = sizeof(struct lttng_ust_event_common);
835 event_recorder->parent->type = LTTNG_UST_EVENT_TYPE_RECORDER;
836 event_recorder->parent->child = event_recorder;
837
838 event_recorder_priv = zmalloc(sizeof(struct lttng_ust_event_recorder_private));
839 if (!event_recorder_priv) {
840 free(event_recorder->parent);
841 free(event_recorder);
842 return NULL;
843 }
844 event_recorder->priv = event_recorder_priv;
845 event_recorder_priv->pub = event_recorder;
846 event_recorder->parent->priv = &event_recorder_priv->parent.parent;
847 event_recorder_priv->parent.parent.pub = event_recorder->parent;
848 event_recorder->chan = event_recorder_enabler->chan;
849
850 /* Event will be enabled by enabler sync. */
851 event_recorder->parent->run_filter = lttng_ust_interpret_event_filter;
852 event_recorder->parent->enabled = 0;
853 event_recorder->parent->priv->registered = 0;
854 CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->filter_bytecode_runtime_head);
855 CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->enablers_ref_head);
856 event_recorder_priv->parent.chan = event_recorder_enabler->chan->parent;
857 event_recorder->priv->parent.parent.desc = desc;
858
859 return event_recorder->parent;
860 }
861 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
862 {
863 struct lttng_event_notifier_enabler *event_notifier_enabler =
864 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
865 struct lttng_ust_event_notifier *event_notifier;
866 struct lttng_ust_event_notifier_private *event_notifier_priv;
867 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
868 uint64_t token = event_notifier_enabler->parent.user_token;
869 uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
870
871 event_notifier = zmalloc(sizeof(struct lttng_ust_event_notifier));
872 if (!event_notifier)
873 return NULL;
874 event_notifier->struct_size = sizeof(struct lttng_ust_event_notifier);
875
876 event_notifier->parent = zmalloc(sizeof(struct lttng_ust_event_common));
877 if (!event_notifier->parent) {
878 free(event_notifier);
879 return NULL;
880 }
881 event_notifier->parent->struct_size = sizeof(struct lttng_ust_event_common);
882 event_notifier->parent->type = LTTNG_UST_EVENT_TYPE_NOTIFIER;
883 event_notifier->parent->child = event_notifier;
884
885 event_notifier_priv = zmalloc(sizeof(struct lttng_ust_event_notifier_private));
886 if (!event_notifier_priv) {
887 free(event_notifier->parent);
888 free(event_notifier);
889 return NULL;
890 }
891 event_notifier->priv = event_notifier_priv;
892 event_notifier_priv->pub = event_notifier;
893 event_notifier->parent->priv = &event_notifier_priv->parent;
894 event_notifier_priv->parent.pub = event_notifier->parent;
895
896 event_notifier_priv->group = event_notifier_group;
897 event_notifier_priv->parent.user_token = token;
898 event_notifier_priv->error_counter_index = error_counter_index;
899
900 /* Event notifier will be enabled by enabler sync. */
901 event_notifier->parent->run_filter = lttng_ust_interpret_event_filter;
902 event_notifier->parent->enabled = 0;
903 event_notifier_priv->parent.registered = 0;
904
905 CDS_INIT_LIST_HEAD(&event_notifier->parent->priv->filter_bytecode_runtime_head);
906 CDS_INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
907 CDS_INIT_LIST_HEAD(&event_notifier_priv->parent.enablers_ref_head);
908 event_notifier->notification_send = lttng_event_notifier_notification_send;
909 event_notifier_priv->parent.desc = desc;
910 return event_notifier->parent;
911 }
912 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
913 {
914 struct lttng_event_counter_enabler *event_counter_enabler =
915 caa_container_of(event_enabler, struct lttng_event_counter_enabler, parent.parent);
916 struct lttng_ust_event_counter *event_counter;
917 struct lttng_ust_event_counter_private *event_counter_priv;
918
919 event_counter = zmalloc(sizeof(struct lttng_ust_event_counter));
920 if (!event_counter)
921 return NULL;
922 event_counter->struct_size = sizeof(struct lttng_ust_event_counter);
923
924 event_counter->parent = zmalloc(sizeof(struct lttng_ust_event_common));
925 if (!event_counter->parent) {
926 free(event_counter);
927 return NULL;
928 }
929 event_counter->parent->struct_size = sizeof(struct lttng_ust_event_common);
930 event_counter->parent->type = LTTNG_UST_EVENT_TYPE_COUNTER;
931 event_counter->parent->child = event_counter;
932
933 event_counter_priv = zmalloc(sizeof(struct lttng_ust_event_counter_private));
934 if (!event_counter_priv) {
935 free(event_counter->parent);
936 free(event_counter);
937 return NULL;
938 }
939 event_counter->priv = event_counter_priv;
940 event_counter_priv->pub = event_counter;
941 event_counter->parent->priv = &event_counter_priv->parent.parent;
942 event_counter_priv->parent.parent.pub = event_counter->parent;
943 event_counter->chan = event_counter_enabler->chan;
944
945 /* Event will be enabled by enabler sync. */
946 event_counter->parent->run_filter = lttng_ust_interpret_event_filter;
947 event_counter->parent->enabled = 0;
948 event_counter->parent->priv->registered = 0;
949 CDS_INIT_LIST_HEAD(&event_counter->parent->priv->filter_bytecode_runtime_head);
950 CDS_INIT_LIST_HEAD(&event_counter->parent->priv->enablers_ref_head);
951 event_counter_priv->parent.chan = event_counter_enabler->chan->parent;
952 if (!event_counter->chan->priv->parent.coalesce_hits)
953 event_counter->priv->parent.parent.user_token = event_counter_enabler->parent.parent.user_token;
954 event_counter->priv->parent.parent.desc = desc;
955 strcpy(event_counter_priv->key, key_string);
956 event_counter_priv->action = event_counter_enabler->action;
957 return event_counter->parent;
958 }
959 default:
960 return NULL;
961 }
962}
963
964static
965void lttng_ust_event_free(struct lttng_ust_event_common *event)
966{
967 struct lttng_ust_event_common_private *event_priv = event->priv;
968
969 switch (event->type) {
970 case LTTNG_UST_EVENT_TYPE_RECORDER:
971 {
972 struct lttng_ust_event_recorder_private *event_recorder_priv =
973 caa_container_of(event_priv, struct lttng_ust_event_recorder_private, parent.parent);
974
975 free(event_recorder_priv->pub->parent);
976 free(event_recorder_priv->pub);
977 free(event_recorder_priv);
978 break;
979 }
980 case LTTNG_UST_EVENT_TYPE_NOTIFIER:
981 {
982 struct lttng_ust_event_notifier_private *event_notifier_priv =
983 caa_container_of(event_priv, struct lttng_ust_event_notifier_private, parent);
984
985 free(event_notifier_priv->pub->parent);
986 free(event_notifier_priv->pub);
987 free(event_notifier_priv);
988 break;
989 }
990 case LTTNG_UST_EVENT_TYPE_COUNTER:
991 {
992 struct lttng_ust_event_counter_private *event_counter_priv =
993 caa_container_of(event_priv, struct lttng_ust_event_counter_private, parent.parent);
994
995 free(event_counter_priv->pub->parent);
996 free(event_counter_priv->pub);
997 free(event_counter_priv);
998 break;
999 }
1000 default:
1001 WARN_ON_ONCE(1);
1002 }
1003}
1004
1005static
1006int lttng_event_register_to_sessiond(struct lttng_event_enabler_common *event_enabler,
1007 struct lttng_ust_event_common *event,
1008 const char *name)
1009{
1010 switch (event_enabler->enabler_type) {
1011 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1012 {
1013 struct lttng_event_enabler_session_common *event_enabler_session =
1014 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1015 struct lttng_ust_event_session_common_private *event_session_priv =
1016 caa_container_of(event->priv, struct lttng_ust_event_session_common_private, parent);
1017 struct lttng_ust_session *session = event_enabler_session->chan->session;
1018 const struct lttng_ust_event_desc *desc = event->priv->desc;
1019 int notify_socket, loglevel, ret;
1020 const char *uri;
1021 uint32_t id;
1022
1023 if (desc->loglevel)
1024 loglevel = *(*desc->loglevel);
1025 else
1026 loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
1027 if (desc->model_emf_uri)
1028 uri = *(desc->model_emf_uri);
1029 else
1030 uri = NULL;
1031
1032 notify_socket = lttng_get_notify_socket(session->priv->owner);
1033 if (notify_socket < 0)
1034 return notify_socket;
1035
1036 /* Fetch event ID from sessiond */
1037 ret = ustcomm_register_event(notify_socket,
1038 session,
1039 session->priv->objd,
1040 event_enabler_session->chan->priv->objd,
1041 name,
1042 loglevel,
1043 desc->tp_class->signature,
1044 desc->tp_class->nr_fields,
1045 desc->tp_class->fields,
1046 uri,
1047 event_enabler_session->parent.user_token,
1048 &id);
1049 if (ret)
1050 return ret;
1051 event_session_priv->id = id;
1052 return 0;
1053 }
1054 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1055 {
1056 struct lttng_event_enabler_session_common *event_enabler_session =
1057 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1058 struct lttng_ust_event_session_common_private *event_session_priv =
1059 caa_container_of(event->priv, struct lttng_ust_event_session_common_private, parent);
1060 struct lttng_ust_session *session = event_enabler_session->chan->session;
1061 uint64_t dimension_index[LTTNG_COUNTER_DIMENSION_MAX];
1062 int notify_socket, ret;
1063
1064 notify_socket = lttng_get_notify_socket(session->priv->owner);
1065 if (notify_socket < 0)
1066 return notify_socket;
1067
1068 /* Fetch key index from sessiond */
1069 ret = ustcomm_register_key(notify_socket,
1070 session->priv->objd,
1071 event_enabler_session->chan->priv->objd,
1072 0, /* target dimension */
1073 NULL,
1074 name,
1075 event_enabler_session->parent.user_token,
1076 dimension_index); /* Filled up to target dimension. */
1077 if (ret)
1078 return ret;
1079 event_session_priv->id = dimension_index[0];
1080 return 0;
1081 }
1082
1083 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1084 return 0;
1085 default:
1086 return -EINVAL;
1087 }
1088}
1089
1090static
1091bool lttng_event_enabler_event_desc_key_match_event(struct lttng_event_enabler_common *event_enabler,
1092 const struct lttng_ust_event_desc *desc,
1093 const char *key_string,
1094 struct lttng_ust_event_common *event)
1095{
1096 switch (event_enabler->enabler_type) {
1097 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1098 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1099 {
1100 struct lttng_event_enabler_session_common *event_session_enabler =
1101 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1102 struct lttng_ust_event_session_common_private *event_session_priv =
1103 caa_container_of(event->priv, struct lttng_ust_event_session_common_private, parent);
1104 bool same_event = false, same_channel = false, same_key = false,
1105 same_token = false;
1106
1107 WARN_ON_ONCE(!event->priv->desc);
1108 if (event->priv->desc == desc)
1109 same_event = true;
1110 if (event_session_enabler->chan == event_session_priv->chan) {
1111 same_channel = true;
1112 if (match_event_session_token(event_session_priv, event_enabler->user_token))
1113 same_token = true;
1114 }
1115 if (match_event_key(event, key_string))
1116 same_key = true;
1117 return same_event && same_channel && same_key && same_token;
1118 }
1119
1120 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1121 {
1122 /*
1123 * Check if event_notifier already exists by checking
1124 * if the event_notifier and enabler share the same
1125 * description and id.
1126 */
1127 return event->priv->desc == desc && event->priv->user_token == event_enabler->user_token;
1128 }
1129
1130 default:
1131 WARN_ON_ONCE(1);
1132 return false;
1133 }
1134}
1135
1136static
1137int lttng_ust_event_create(struct lttng_event_enabler_common *event_enabler, const struct lttng_ust_event_desc *desc)
1138{
1139 char key_string[LTTNG_KEY_TOKEN_STRING_LEN_MAX] = { 0 };
1140 char name[LTTNG_UST_ABI_SYM_NAME_LEN] = { 0 };
1141 struct cds_list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
1142 struct lttng_ust_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
1143 struct lttng_ust_event_common_private *event_priv_iter;
1144 struct lttng_ust_event_common *event;
1145 struct cds_hlist_head *name_head;
1146 int ret = 0;
1147
1148 if (format_event_key(event_enabler, key_string, desc->probe_desc->provider_name, desc->event_name)) {
1149 ret = -EINVAL;
1150 goto type_error;
1151 }
1152
1153 lttng_ust_format_event_name(desc, name);
1154 name_head = borrow_hash_table_bucket(events_ht->table, LTTNG_UST_EVENT_HT_SIZE, name);
1155 cds_hlist_for_each_entry_2(event_priv_iter, name_head, name_hlist_node) {
1156 if (lttng_event_enabler_event_desc_key_match_event(event_enabler,
1157 desc, key_string, event_priv_iter->pub)) {
1158 ret = -EEXIST;
1159 goto exist;
1160 }
1161 }
1162
1163 ret = lttng_create_all_event_enums(event_enabler, desc);
1164 if (ret < 0) {
1165 DBG("Error (%d) adding enum to session", ret);
1166 goto create_enum_error;
1167 }
1168
1169 event = lttng_ust_event_alloc(event_enabler, desc, key_string);
1170 if (!event) {
1171 ret = -ENOMEM;
1172 goto alloc_error;
1173 }
1174
1175 ret = lttng_event_register_to_sessiond(event_enabler, event, name);
1176 if (ret < 0) {
1177 DBG("Error (%d) registering event '%s' key '%s' to sessiond", ret, name, key_string);
1178 goto sessiond_register_error;
1179 }
1180
1181 cds_list_add(&event->priv->node, event_list_head);
1182 cds_hlist_add_head(&event->priv->name_hlist_node, name_head);
1183 return 0;
1184
1185sessiond_register_error:
1186 lttng_ust_event_free(event);
1187alloc_error:
1188create_enum_error:
1189exist:
1190type_error:
1191 return ret;
1192}
1193
1194static
1195int lttng_desc_match_star_glob_enabler(const struct lttng_ust_event_desc *desc,
1196 struct lttng_event_enabler_common *enabler)
1197{
1198 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
1199 int loglevel = 0;
1200 unsigned int has_loglevel = 0;
1201
1202 lttng_ust_format_event_name(desc, name);
1203 assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB);
1204 if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX,
1205 name, SIZE_MAX))
1206 return 0;
1207 if (desc->loglevel) {
1208 loglevel = *(*desc->loglevel);
1209 has_loglevel = 1;
1210 }
1211 if (!lttng_loglevel_match(loglevel,
1212 has_loglevel,
1213 enabler->event_param.loglevel_type,
1214 enabler->event_param.loglevel))
1215 return 0;
1216 return 1;
1217}
1218
1219static
1220int lttng_desc_match_event_enabler(const struct lttng_ust_event_desc *desc,
1221 struct lttng_event_enabler_common *enabler)
1222{
1223 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
1224 int loglevel = 0;
1225 unsigned int has_loglevel = 0;
1226
1227 lttng_ust_format_event_name(desc, name);
1228 assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT);
1229 if (strcmp(name, enabler->event_param.name))
1230 return 0;
1231 if (desc->loglevel) {
1232 loglevel = *(*desc->loglevel);
1233 has_loglevel = 1;
1234 }
1235 if (!lttng_loglevel_match(loglevel,
1236 has_loglevel,
1237 enabler->event_param.loglevel_type,
1238 enabler->event_param.loglevel))
1239 return 0;
1240 return 1;
1241}
1242
1243static
1244int lttng_desc_match_enabler(const struct lttng_ust_event_desc *desc,
1245 struct lttng_event_enabler_common *enabler)
1246{
1247 switch (enabler->format_type) {
1248 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
1249 {
1250 struct lttng_ust_excluder_node *excluder;
1251
1252 if (!lttng_desc_match_star_glob_enabler(desc, enabler)) {
1253 return 0;
1254 }
1255
1256 /*
1257 * If the matching event matches with an excluder,
1258 * return 'does not match'
1259 */
1260 cds_list_for_each_entry(excluder, &enabler->excluder_head, node) {
1261 int count;
1262
1263 for (count = 0; count < excluder->excluder.count; count++) {
1264 int len;
1265 char *excluder_name;
1266
1267 excluder_name = (char *) (excluder->excluder.names)
1268 + count * LTTNG_UST_ABI_SYM_NAME_LEN;
1269 len = strnlen(excluder_name, LTTNG_UST_ABI_SYM_NAME_LEN);
1270 if (len > 0) {
1271 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
1272
1273 lttng_ust_format_event_name(desc, name);
1274 if (strutils_star_glob_match(excluder_name, len, name, SIZE_MAX)) {
1275 return 0;
1276 }
1277 }
1278 }
1279 }
1280 return 1;
1281 }
1282 case LTTNG_ENABLER_FORMAT_EVENT:
1283 return lttng_desc_match_event_enabler(desc, enabler);
1284 default:
1285 return -EINVAL;
1286 }
1287}
1288
1289static
1290bool lttng_event_session_enabler_match_event_session(struct lttng_event_enabler_session_common *event_enabler_session,
1291 struct lttng_ust_event_session_common_private *event_session_priv)
1292{
1293 if (lttng_desc_match_enabler(event_session_priv->parent.desc, &event_enabler_session->parent)
1294 && event_session_priv->chan == event_enabler_session->chan
1295 && match_event_session_token(event_session_priv, event_enabler_session->parent.user_token))
1296 return true;
1297 else
1298 return false;
1299}
1300
1301static
1302int lttng_event_notifier_enabler_match_event_notifier(
1303 struct lttng_event_notifier_enabler *event_notifier_enabler,
1304 struct lttng_ust_event_notifier_private *event_notifier_priv)
1305{
1306 int desc_matches = lttng_desc_match_enabler(event_notifier_priv->parent.desc,
1307 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
1308
1309 if (desc_matches && event_notifier_priv->group == event_notifier_enabler->group &&
1310 event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token)
1311 return 1;
1312 else
1313 return 0;
1314}
1315
1316static
1317bool lttng_event_enabler_match_event(
1318 struct lttng_event_enabler_common *event_enabler,
1319 struct lttng_ust_event_common *event)
1320{
1321 switch (event_enabler->enabler_type) {
1322 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1323 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1324 {
1325 struct lttng_event_enabler_session_common *event_enabler_session =
1326 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1327 struct lttng_ust_event_session_common_private *event_session_priv =
1328 caa_container_of(event->priv, struct lttng_ust_event_session_common_private, parent);
1329 return lttng_event_session_enabler_match_event_session(event_enabler_session, event_session_priv);
1330 }
1331 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1332 {
1333 struct lttng_event_notifier_enabler *event_notifier_enabler =
1334 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1335 struct lttng_ust_event_notifier_private *event_notifier_priv =
1336 caa_container_of(event->priv, struct lttng_ust_event_notifier_private, parent);
1337 return lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier_priv);
1338 }
1339 }
1340 return false;
1341}
1342
1343static
1344struct lttng_enabler_ref *lttng_enabler_ref(
1345 struct cds_list_head *enabler_ref_list,
1346 struct lttng_event_enabler_common *enabler)
1347{
1348 struct lttng_enabler_ref *enabler_ref;
1349
1350 cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) {
1351 if (enabler_ref->ref == enabler)
1352 return enabler_ref;
1353 }
1354 return NULL;
1355}
1356
1357/*
1358 * Create struct lttng_ust_event_common if it is missing and present in the list of
1359 * tracepoint probes.
1360 */
1361static
1362void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler)
1363{
1364 struct lttng_ust_registered_probe *reg_probe;
1365 const struct lttng_ust_event_desc *desc;
1366 struct cds_list_head *probe_list;
1367 int i;
1368
1369 probe_list = lttng_get_probe_list_head();
1370 /*
1371 * For each probe event, if we find that a probe event matches
1372 * our enabler, create an associated lttng_ust_event_common if not
1373 * already present.
1374 */
1375 cds_list_for_each_entry(reg_probe, probe_list, head) {
1376 const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc;
1377
1378 for (i = 0; i < probe_desc->nr_events; i++) {
1379 int ret;
1380
1381 desc = probe_desc->event_desc[i];
1382 if (!lttng_desc_match_enabler(desc, event_enabler))
1383 continue;
1384 /*
1385 * We need to create an event for this event probe.
1386 */
1387 ret = lttng_ust_event_create(event_enabler, probe_desc->event_desc[i]);
1388 /* Skip if already found. */
1389 if (ret == -EEXIST)
1390 continue;
1391 if (ret) {
1392 DBG("Unable to create event \"%s:%s\", error %d\n",
1393 probe_desc->provider_name,
1394 probe_desc->event_desc[i]->event_name, ret);
1395 }
1396 }
1397 }
1398}
1399
1400static
1401void probe_provider_event_for_each(const struct lttng_ust_probe_desc *provider_desc,
1402 void (*event_func)(struct lttng_ust_event_common *event))
1403{
1404 struct cds_hlist_node *node, *tmp_node;
1405 struct cds_list_head *sessionsp;
1406 unsigned int i;
1407
1408 /* Get handle on list of sessions. */
1409 sessionsp = lttng_get_sessions();
1410
1411 /*
1412 * Iterate over all events in the probe provider descriptions and
1413 * sessions to queue the unregistration of the events.
1414 */
1415 for (i = 0; i < provider_desc->nr_events; i++) {
1416 const struct lttng_ust_event_desc *event_desc;
1417 struct lttng_event_notifier_group *event_notifier_group;
1418 struct lttng_ust_session_private *session_priv;
1419 struct cds_hlist_head *head;
1420
1421 event_desc = provider_desc->event_desc[i];
1422
1423 /*
1424 * Iterate over all session to find the current event
1425 * description.
1426 */
1427 cds_list_for_each_entry(session_priv, sessionsp, node) {
1428 struct lttng_ust_event_common_private *event_priv;
1429 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
1430
1431 /*
1432 * Get the list of events in the hashtable bucket and
1433 * iterate to find the event matching this descriptor.
1434 */
1435 lttng_ust_format_event_name(event_desc, name);
1436 head = borrow_hash_table_bucket(
1437 session_priv->events_name_ht.table,
1438 LTTNG_UST_EVENT_HT_SIZE, name);
1439
1440 cds_hlist_for_each_entry_safe(event_priv, node, tmp_node, head, name_hlist_node) {
1441 if (event_desc == event_priv->desc) {
1442 event_func(event_priv->pub);
1443 break;
1444 }
1445 }
1446 }
1447
1448 /*
1449 * Iterate over all event_notifier groups to find the current event
1450 * description.
1451 */
1452 cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
1453 struct lttng_ust_event_common_private *event_priv;
1454 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
1455
1456 /*
1457 * Get the list of event_notifiers in the hashtable bucket and
1458 * iterate to find the event_notifier matching this
1459 * descriptor.
1460 */
1461 lttng_ust_format_event_name(event_desc, name);
1462 head = borrow_hash_table_bucket(
1463 event_notifier_group->event_notifiers_ht.table,
1464 LTTNG_UST_EVENT_HT_SIZE, name);
1465
1466 cds_hlist_for_each_entry_safe(event_priv, node, tmp_node, head, name_hlist_node) {
1467 if (event_desc == event_priv->desc) {
1468 event_func(event_priv->pub);
1469 break;
1470 }
1471 }
1472 }
1473 }
1474}
1475
1476static
1477void _event_enum_destroy(struct lttng_ust_event_common *event)
1478{
1479
1480 switch (event->type) {
1481 case LTTNG_UST_EVENT_TYPE_RECORDER: /* Fall-through */
1482 case LTTNG_UST_EVENT_TYPE_COUNTER:
1483 {
1484 struct lttng_ust_event_common_private *event_priv = event->priv;
1485 struct lttng_ust_event_session_common_private *event_session_priv =
1486 caa_container_of(event_priv, struct lttng_ust_event_session_common_private, parent);
1487 struct lttng_ust_session *session = event_session_priv->chan->session;
1488 unsigned int i;
1489
1490 /* Destroy enums of the current event. */
1491 for (i = 0; i < event_session_priv->parent.desc->tp_class->nr_fields; i++) {
1492 const struct lttng_ust_enum_desc *enum_desc;
1493 const struct lttng_ust_event_field *field;
1494 struct lttng_enum *curr_enum;
1495
1496 field = event_session_priv->parent.desc->tp_class->fields[i];
1497 switch (field->type->type) {
1498 case lttng_ust_type_enum:
1499 enum_desc = lttng_ust_get_type_enum(field->type)->desc;
1500 break;
1501 default:
1502 continue;
1503 }
1504
1505 curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc);
1506 if (curr_enum) {
1507 _lttng_enum_destroy(curr_enum);
1508 }
1509 }
1510 break;
1511 }
1512 case LTTNG_UST_EVENT_TYPE_NOTIFIER:
1513 break;
1514 default:
1515 abort();
1516 }
1517 /* Destroy event. */
1518 _lttng_event_destroy(event);
1519}
1520
1521/*
1522 * Iterate over all the UST sessions to unregister and destroy all probes from
1523 * the probe provider descriptor received as argument. Must me called with the
1524 * ust_lock held.
1525 */
1526void lttng_probe_provider_unregister_events(
1527 const struct lttng_ust_probe_desc *provider_desc)
1528{
1529 /*
1530 * Iterate over all events in the probe provider descriptions and sessions
1531 * to queue the unregistration of the events.
1532 */
1533 probe_provider_event_for_each(provider_desc, _lttng_event_unregister);
1534
1535 /* Wait for grace period. */
1536 lttng_ust_urcu_synchronize_rcu();
1537 /* Prune the unregistration queue. */
1538 lttng_ust_tp_probe_prune_release_queue();
1539
1540 /*
1541 * It is now safe to destroy the events and remove them from the event list
1542 * and hashtables.
1543 */
1544 probe_provider_event_for_each(provider_desc, _event_enum_destroy);
1545}
1546
1547static
1548void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
1549 struct lttng_ust_event_common *event)
1550{
1551 switch (event_enabler->enabler_type) {
1552 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1553 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1554 {
1555 struct lttng_event_enabler_session_common *event_enabler_session =
1556 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1557
1558 lttng_enabler_link_bytecode(event->priv->desc, &event_enabler_session->chan->session->priv->ctx,
1559 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
1560 break;
1561 }
1562 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1563 {
1564 struct lttng_event_notifier_enabler *event_notifier_enabler =
1565 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1566
1567 lttng_enabler_link_bytecode(event->priv->desc, &event_notifier_enabler->group->ctx,
1568 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
1569 break;
1570 }
1571 default:
1572 WARN_ON_ONCE(1);
1573 }
1574}
1575
1576static
1577void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
1578 struct lttng_ust_event_common *event)
1579{
1580 switch (event_enabler->enabler_type) {
1581 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1582 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1583 break;
1584 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1585 {
1586 struct lttng_event_notifier_enabler *event_notifier_enabler =
1587 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1588 struct lttng_ust_event_notifier *event_notifier = event->child;
1589
1590 lttng_enabler_link_bytecode(event->priv->desc, &event_notifier_enabler->group->ctx,
1591 &event_notifier->priv->capture_bytecode_runtime_head,
1592 &event_notifier_enabler->capture_bytecode_head);
1593 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
1594 break;
1595 }
1596 default:
1597 WARN_ON_ONCE(1);
1598 }
1599}
1600
1601/*
1602 * Called at library load: connect the probe on all enablers matching
1603 * this event.
1604 * Called with session mutex held.
1605 */
1606int lttng_fix_pending_events(void)
1607{
1608 struct lttng_ust_session_private *session_priv;
1609
1610 cds_list_for_each_entry(session_priv, &sessions, node) {
1611 /*
1612 * New probes have appeared, we need to re-sync all
1613 * enablers.
1614 */
1615 lttng_session_unsync_enablers(session_priv->pub);
1616 lttng_session_lazy_sync_event_enablers(session_priv->pub);
1617 }
1618 return 0;
1619}
1620
1621int lttng_fix_pending_event_notifiers(void)
1622{
1623 struct lttng_event_notifier_group *event_notifier_group;
1624
1625 cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
1626 /*
1627 * New probes have appeared, we need to re-sync all
1628 * enablers.
1629 */
1630 lttng_event_notifier_group_unsync_enablers(event_notifier_group);
1631 lttng_event_notifier_group_sync_enablers(event_notifier_group);
1632 }
1633 return 0;
1634}
1635
1636/*
1637 * For each session of the owner thread, execute pending statedump.
1638 * Only dump state for the sessions owned by the caller thread, because
1639 * we don't keep ust_lock across the entire iteration.
1640 */
1641void lttng_handle_pending_statedump(void *owner)
1642{
1643 struct lttng_ust_session_private *session_priv;
1644
1645 /* Execute state dump */
1646 do_lttng_ust_statedump(owner);
1647
1648 /* Clear pending state dump */
1649 if (ust_lock()) {
1650 goto end;
1651 }
1652 cds_list_for_each_entry(session_priv, &sessions, node) {
1653 if (session_priv->owner != owner)
1654 continue;
1655 if (!session_priv->statedump_pending)
1656 continue;
1657 session_priv->statedump_pending = 0;
1658 }
1659end:
1660 ust_unlock();
1661 return;
1662}
1663
1664static
1665void _lttng_event_destroy(struct lttng_ust_event_common *event)
1666{
1667 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1668
1669 lttng_free_event_filter_runtime(event);
1670 /* Free event enabler refs */
1671 cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1672 &event->priv->enablers_ref_head, node)
1673 free(enabler_ref);
1674
1675 /* Remove from event list. */
1676 cds_list_del(&event->priv->node);
1677 /* Remove from event hash table. */
1678 cds_hlist_del(&event->priv->name_hlist_node);
1679
1680 lttng_ust_event_free(event);
1681}
1682
1683static
1684void _lttng_enum_destroy(struct lttng_enum *_enum)
1685{
1686 cds_list_del(&_enum->node);
1687 cds_hlist_del(&_enum->hlist);
1688 free(_enum);
1689}
1690
1691void lttng_ust_abi_events_exit(void)
1692{
1693 struct lttng_ust_session_private *session_priv, *tmpsession_priv;
1694
1695 cds_list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, node)
1696 lttng_session_destroy(session_priv->pub);
1697}
1698
1699/*
1700 * Enabler management.
1701 */
1702struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
1703 enum lttng_enabler_format_type format_type,
1704 const struct lttng_ust_abi_event *event_param,
1705 struct lttng_ust_channel_buffer *chan)
1706{
1707 struct lttng_event_recorder_enabler *event_enabler;
1708
1709 event_enabler = zmalloc(sizeof(*event_enabler));
1710 if (!event_enabler)
1711 return NULL;
1712 event_enabler->parent.parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
1713 event_enabler->parent.parent.format_type = format_type;
1714 CDS_INIT_LIST_HEAD(&event_enabler->parent.parent.filter_bytecode_head);
1715 CDS_INIT_LIST_HEAD(&event_enabler->parent.parent.excluder_head);
1716 memcpy(&event_enabler->parent.parent.event_param, event_param,
1717 sizeof(event_enabler->parent.parent.event_param));
1718 event_enabler->chan = chan;
1719 /* ctx left NULL */
1720 event_enabler->parent.parent.enabled = 0;
1721 event_enabler->parent.parent.user_token = event_param->token;
1722 event_enabler->parent.chan = chan->parent;
1723 cds_list_add(&event_enabler->parent.parent.node, &event_enabler->chan->parent->session->priv->unsync_enablers_head);
1724 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
1725
1726 return event_enabler;
1727}
1728
1729struct lttng_event_counter_enabler *lttng_event_counter_enabler_create(
1730 enum lttng_enabler_format_type format_type,
1731 const struct lttng_ust_abi_counter_event *counter_event,
1732 const struct lttng_counter_key *key,
1733 struct lttng_ust_channel_counter *chan)
1734{
1735 struct lttng_event_counter_enabler *event_enabler;
1736 enum lttng_event_counter_action action;
1737
1738 event_enabler = zmalloc(sizeof(*event_enabler));
1739 if (!event_enabler)
1740 return NULL;
1741
1742 switch (counter_event->action) {
1743 case LTTNG_UST_ABI_COUNTER_ACTION_INCREMENT:
1744 action = LTTNG_EVENT_COUNTER_ACTION_INCREMENT;
1745 break;
1746 default:
1747 goto error;
1748 }
1749 event_enabler->action = action;
1750 event_enabler->parent.parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_COUNTER;
1751 event_enabler->parent.parent.format_type = format_type;
1752 CDS_INIT_LIST_HEAD(&event_enabler->parent.parent.filter_bytecode_head);
1753 CDS_INIT_LIST_HEAD(&event_enabler->parent.parent.excluder_head);
1754 memcpy(&event_enabler->parent.parent.event_param, &counter_event->event,
1755 sizeof(event_enabler->parent.parent.event_param));
1756 event_enabler->chan = chan;
1757 memcpy(&event_enabler->key, key, sizeof(struct lttng_counter_key));
1758 /* ctx left NULL */
1759 event_enabler->parent.parent.enabled = 0;
1760 event_enabler->parent.parent.user_token = counter_event->event.token;
1761 event_enabler->parent.chan = chan->parent;
1762 cds_list_add(&event_enabler->parent.parent.node, &event_enabler->chan->parent->session->priv->unsync_enablers_head);
1763 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
1764
1765 return event_enabler;
1766
1767error:
1768 free(event_enabler);
1769 return NULL;
1770}
1771
1772struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
1773 struct lttng_event_notifier_group *event_notifier_group,
1774 enum lttng_enabler_format_type format_type,
1775 struct lttng_ust_abi_event_notifier *event_notifier_param)
1776{
1777 struct lttng_event_notifier_enabler *event_notifier_enabler;
1778
1779 event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler));
1780 if (!event_notifier_enabler)
1781 return NULL;
1782 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
1783 event_notifier_enabler->parent.format_type = format_type;
1784 CDS_INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
1785 CDS_INIT_LIST_HEAD(&event_notifier_enabler->parent.excluder_head);
1786 CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
1787
1788 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
1789 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
1790 event_notifier_enabler->num_captures = 0;
1791
1792 memcpy(&event_notifier_enabler->parent.event_param.name,
1793 event_notifier_param->event.name,
1794 sizeof(event_notifier_enabler->parent.event_param.name));
1795 event_notifier_enabler->parent.event_param.instrumentation =
1796 event_notifier_param->event.instrumentation;
1797 event_notifier_enabler->parent.event_param.loglevel =
1798 event_notifier_param->event.loglevel;
1799 event_notifier_enabler->parent.event_param.loglevel_type =
1800 event_notifier_param->event.loglevel_type;
1801
1802 event_notifier_enabler->parent.enabled = 0;
1803 event_notifier_enabler->group = event_notifier_group;
1804
1805 cds_list_add(&event_notifier_enabler->parent.node, &event_notifier_group->unsync_enablers_head);
1806
1807 lttng_event_notifier_group_sync_enablers(event_notifier_group);
1808
1809 return event_notifier_enabler;
1810}
1811
1812int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
1813{
1814 event_enabler->enabled = 1;
1815 lttng_event_enabler_unsync(event_enabler);
1816 lttng_event_enabler_sync(event_enabler);
1817 return 0;
1818}
1819
1820int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
1821{
1822 event_enabler->enabled = 0;
1823 lttng_event_enabler_unsync(event_enabler);
1824 lttng_event_enabler_sync(event_enabler);
1825
1826 return 0;
1827}
1828
1829int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
1830 struct lttng_ust_bytecode_node **bytecode)
1831{
1832 (*bytecode)->enabler = event_enabler;
1833 cds_list_add_tail(&(*bytecode)->node, &event_enabler->filter_bytecode_head);
1834 /* Take ownership of bytecode */
1835 *bytecode = NULL;
1836 lttng_event_enabler_unsync(event_enabler);
1837 lttng_event_enabler_sync(event_enabler);
1838 return 0;
1839}
1840
1841int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler_common *event_enabler,
1842 struct lttng_ust_excluder_node **excluder)
1843{
1844 (*excluder)->enabler = event_enabler;
1845 cds_list_add_tail(&(*excluder)->node, &event_enabler->excluder_head);
1846 /* Take ownership of excluder */
1847 *excluder = NULL;
1848 lttng_event_enabler_unsync(event_enabler);
1849 lttng_event_enabler_sync(event_enabler);
1850 return 0;
1851}
1852
1853int lttng_event_notifier_enabler_attach_capture_bytecode(
1854 struct lttng_event_notifier_enabler *event_notifier_enabler,
1855 struct lttng_ust_bytecode_node **bytecode)
1856{
1857 (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler(
1858 event_notifier_enabler);
1859 cds_list_add_tail(&(*bytecode)->node,
1860 &event_notifier_enabler->capture_bytecode_head);
1861 /* Take ownership of bytecode */
1862 *bytecode = NULL;
1863 event_notifier_enabler->num_captures++;
1864 lttng_event_enabler_unsync(&event_notifier_enabler->parent);
1865 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
1866 return 0;
1867}
1868
1869int lttng_attach_context(struct lttng_ust_abi_context *context_param,
1870 union lttng_ust_abi_args *uargs,
1871 struct lttng_ust_ctx **ctx, struct lttng_ust_session *session)
1872{
1873 /*
1874 * We cannot attach a context after trace has been started for a
1875 * session because the metadata does not allow expressing this
1876 * information outside of the original channel scope.
1877 */
1878 if (session->priv->been_active)
1879 return -EPERM;
1880
1881 switch (context_param->ctx) {
1882 case LTTNG_UST_ABI_CONTEXT_PTHREAD_ID:
1883 return lttng_add_pthread_id_to_ctx(ctx);
1884 case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER:
1885 {
1886 struct lttng_ust_abi_perf_counter_ctx *perf_ctx_param;
1887
1888 perf_ctx_param = &context_param->u.perf_counter;
1889 return lttng_add_perf_counter_to_ctx(
1890 perf_ctx_param->type,
1891 perf_ctx_param->config,
1892 perf_ctx_param->name,
1893 ctx);
1894 }
1895 case LTTNG_UST_ABI_CONTEXT_VTID:
1896 return lttng_add_vtid_to_ctx(ctx);
1897 case LTTNG_UST_ABI_CONTEXT_VPID:
1898 return lttng_add_vpid_to_ctx(ctx);
1899 case LTTNG_UST_ABI_CONTEXT_PROCNAME:
1900 return lttng_add_procname_to_ctx(ctx);
1901 case LTTNG_UST_ABI_CONTEXT_IP:
1902 return lttng_add_ip_to_ctx(ctx);
1903 case LTTNG_UST_ABI_CONTEXT_CPU_ID:
1904 return lttng_add_cpu_id_to_ctx(ctx);
1905 case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT:
1906 return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname,
1907 ctx);
1908 case LTTNG_UST_ABI_CONTEXT_CGROUP_NS:
1909 return lttng_add_cgroup_ns_to_ctx(ctx);
1910 case LTTNG_UST_ABI_CONTEXT_IPC_NS:
1911 return lttng_add_ipc_ns_to_ctx(ctx);
1912 case LTTNG_UST_ABI_CONTEXT_MNT_NS:
1913 return lttng_add_mnt_ns_to_ctx(ctx);
1914 case LTTNG_UST_ABI_CONTEXT_NET_NS:
1915 return lttng_add_net_ns_to_ctx(ctx);
1916 case LTTNG_UST_ABI_CONTEXT_PID_NS:
1917 return lttng_add_pid_ns_to_ctx(ctx);
1918 case LTTNG_UST_ABI_CONTEXT_TIME_NS:
1919 return lttng_add_time_ns_to_ctx(ctx);
1920 case LTTNG_UST_ABI_CONTEXT_USER_NS:
1921 return lttng_add_user_ns_to_ctx(ctx);
1922 case LTTNG_UST_ABI_CONTEXT_UTS_NS:
1923 return lttng_add_uts_ns_to_ctx(ctx);
1924 case LTTNG_UST_ABI_CONTEXT_VUID:
1925 return lttng_add_vuid_to_ctx(ctx);
1926 case LTTNG_UST_ABI_CONTEXT_VEUID:
1927 return lttng_add_veuid_to_ctx(ctx);
1928 case LTTNG_UST_ABI_CONTEXT_VSUID:
1929 return lttng_add_vsuid_to_ctx(ctx);
1930 case LTTNG_UST_ABI_CONTEXT_VGID:
1931 return lttng_add_vgid_to_ctx(ctx);
1932 case LTTNG_UST_ABI_CONTEXT_VEGID:
1933 return lttng_add_vegid_to_ctx(ctx);
1934 case LTTNG_UST_ABI_CONTEXT_VSGID:
1935 return lttng_add_vsgid_to_ctx(ctx);
1936 default:
1937 return -EINVAL;
1938 }
1939}
1940
1941int lttng_event_enabler_attach_context(
1942 struct lttng_event_enabler_session_common *enabler __attribute__((unused)),
1943 struct lttng_ust_abi_context *context_param __attribute__((unused)))
1944{
1945 return -ENOSYS;
1946}
1947
1948void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
1949{
1950 struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node;
1951 struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node;
1952
1953 if (!event_enabler) {
1954 return;
1955 }
1956
1957 /* Destroy filter bytecode */
1958 cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
1959 &event_enabler->filter_bytecode_head, node) {
1960 free(filter_node);
1961 }
1962 /* Destroy excluders */
1963 cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node,
1964 &event_enabler->excluder_head, node) {
1965 free(excluder_node);
1966 }
1967
1968 switch (event_enabler->enabler_type) {
1969 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
1970 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
1971 {
1972 struct lttng_event_enabler_session_common *enabler_session =
1973 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
1974
1975 cds_list_del(&enabler_session->parent.node);
1976 break;
1977 }
1978 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1979 break;
1980 }
1981
1982 switch (event_enabler->enabler_type) {
1983 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1984 {
1985 struct lttng_event_recorder_enabler *recorder_enabler =
1986 caa_container_of(event_enabler, struct lttng_event_recorder_enabler, parent.parent);
1987 free(recorder_enabler);
1988 break;
1989 }
1990 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1991 {
1992 struct lttng_event_notifier_enabler *notifier_enabler =
1993 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1994
1995 cds_list_del(&notifier_enabler->parent.node);
1996 free(notifier_enabler);
1997 break;
1998 }
1999 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
2000 {
2001 struct lttng_event_counter_enabler *counter_enabler =
2002 caa_container_of(event_enabler, struct lttng_event_counter_enabler, parent.parent);
2003 free(counter_enabler);
2004 break;
2005 }
2006 }
2007}
2008
2009/*
2010 * Create events associated with an event enabler (if not already present).
2011 * and add backward reference from the event to the enabler.
2012 */
2013static
2014int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
2015{
2016 struct cds_list_head *event_list = lttng_get_event_list_head_from_enabler(event_enabler);
2017 struct lttng_ust_event_common_private *event_priv;
2018
2019 /*
2020 * Only try to create events for enablers that are enabled, the user
2021 * might still be attaching filter or exclusion to the event enabler.
2022 */
2023 if (!event_enabler->enabled)
2024 goto end;
2025
2026 /* First, ensure that probe event_notifiers are created for this enabler. */
2027 lttng_create_event_if_missing(event_enabler);
2028
2029 /* Link the created events with their associated enabler. */
2030 cds_list_for_each_entry(event_priv, event_list, node) {
2031 struct lttng_enabler_ref *enabler_ref;
2032
2033 if (!lttng_event_enabler_match_event(event_enabler, event_priv->pub))
2034 continue;
2035
2036 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
2037 if (!enabler_ref) {
2038 /*
2039 * If no backward ref, create it.
2040 * Add backward ref from event_notifier to enabler.
2041 */
2042 enabler_ref = zmalloc(sizeof(*enabler_ref));
2043 if (!enabler_ref)
2044 return -ENOMEM;
2045
2046 enabler_ref->ref = event_enabler;
2047 cds_list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
2048 }
2049
2050 lttng_event_enabler_init_event_filter(event_enabler, event_priv->pub);
2051 lttng_event_enabler_init_event_capture(event_enabler, event_priv->pub);
2052 }
2053end:
2054 return 0;
2055}
2056
2057static
2058void lttng_event_sync_filter_state(struct lttng_ust_event_common *event)
2059{
2060 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2061 struct lttng_ust_bytecode_runtime *runtime;
2062 struct lttng_enabler_ref *enabler_ref;
2063
2064 /* Check if has enablers without bytecode enabled */
2065 cds_list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2066 if (enabler_ref->ref->enabled
2067 && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2068 has_enablers_without_filter_bytecode = 1;
2069 break;
2070 }
2071 }
2072 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2073
2074 /* Enable filters */
2075 cds_list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2076 lttng_bytecode_sync_state(runtime);
2077 nr_filters++;
2078 }
2079 CMM_STORE_SHARED(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2080}
2081
2082static
2083void lttng_event_sync_capture_state(struct lttng_ust_event_common *event)
2084{
2085 switch (event->type) {
2086 case LTTNG_UST_EVENT_TYPE_RECORDER: /* Fall-through */
2087 case LTTNG_UST_EVENT_TYPE_COUNTER:
2088 break;
2089 case LTTNG_UST_EVENT_TYPE_NOTIFIER:
2090 {
2091 struct lttng_ust_event_notifier *event_notifier = event->child;
2092 struct lttng_ust_bytecode_runtime *runtime;
2093 int nr_captures = 0;
2094
2095 /* Enable captures */
2096 cds_list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2097 lttng_bytecode_sync_state(runtime);
2098 nr_captures++;
2099 }
2100 CMM_STORE_SHARED(event_notifier->eval_capture, !!nr_captures);
2101 break;
2102 }
2103 default:
2104 WARN_ON_ONCE(1);
2105 }
2106}
2107
2108static
2109bool lttng_get_event_enabled_state(struct lttng_ust_event_common *event)
2110{
2111 struct lttng_enabler_ref *enabler_ref;
2112 bool enabled = false;
2113
2114 /* Enable events */
2115 cds_list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2116 if (enabler_ref->ref->enabled) {
2117 enabled = true;
2118 break;
2119 }
2120 }
2121
2122 switch (event->type) {
2123 case LTTNG_UST_EVENT_TYPE_RECORDER: /* Fall-through */
2124 case LTTNG_UST_EVENT_TYPE_COUNTER:
2125 {
2126 struct lttng_ust_event_common_private *event_priv = event->priv;
2127 struct lttng_ust_event_session_common_private *event_session_priv =
2128 caa_container_of(event_priv, struct lttng_ust_event_session_common_private, parent);
2129
2130 /*
2131 * Enabled state is based on union of enablers, with
2132 * intersection of session and channel transient enable
2133 * states.
2134 */
2135 return enabled && event_session_priv->chan->session->priv->tstate && event_session_priv->chan->priv->tstate;
2136 }
2137 case LTTNG_UST_EVENT_TYPE_NOTIFIER:
2138 return enabled;
2139 default:
2140 WARN_ON_ONCE(1);
2141 return false;
2142 }
2143}
2144
2145static
2146void lttng_sync_event_list(struct cds_list_head *sync_event_enabler_list,
2147 struct cds_list_head *unsync_event_enabler_list,
2148 struct cds_list_head *event_list)
2149{
2150 struct lttng_ust_event_common_private *event_priv;
2151 struct lttng_event_enabler_common *event_enabler;
2152 struct cds_list_head iter_list;
2153
2154 /*
2155 * lttng_event_enabler_ref_events can cause lazy probes
2156 * to add items to the unsync_enablers_head list. Iterate on a
2157 * local copy of that list until it is stable (empty).
2158 */
2159 do {
2160 CDS_INIT_LIST_HEAD(&iter_list);
2161 cds_list_splice(unsync_event_enabler_list, &iter_list);
2162 CDS_INIT_LIST_HEAD(unsync_event_enabler_list);
2163 cds_list_for_each_entry(event_enabler, &iter_list, node)
2164 lttng_event_enabler_ref_events(event_enabler);
2165 cds_list_splice(&iter_list, sync_event_enabler_list);
2166 } while (!cds_list_empty(unsync_event_enabler_list));
2167
2168 /*
2169 * For each event, if at least one of its enablers is enabled,
2170 * and its channel and session transient states are enabled, we
2171 * enable the event, else we disable it.
2172 */
2173 cds_list_for_each_entry(event_priv, event_list, node) {
2174 bool enabled = lttng_get_event_enabled_state(event_priv->pub);
2175
2176 CMM_STORE_SHARED(event_priv->pub->enabled, enabled);
2177 /*
2178 * Sync tracepoint registration with event enabled
2179 * state.
2180 */
2181 if (enabled) {
2182 if (!event_priv->registered)
2183 register_event(event_priv->pub);
2184 } else {
2185 if (event_priv->registered)
2186 unregister_event(event_priv->pub);
2187 }
2188
2189 lttng_event_sync_filter_state(event_priv->pub);
2190 lttng_event_sync_capture_state(event_priv->pub);
2191 }
2192 lttng_ust_tp_probe_prune_release_queue();
2193}
2194
2195/*
2196 * lttng_session_sync_event_enablers should be called just before starting a
2197 * session.
2198 */
2199static
2200void lttng_session_sync_event_enablers(struct lttng_ust_session *session)
2201{
2202 lttng_sync_event_list(&session->priv->sync_enablers_head,
2203 &session->priv->unsync_enablers_head,
2204 &session->priv->events_head);
2205}
2206
2207/*
2208 * Apply enablers to session events, adding events to session if need
2209 * be. It is required after each modification applied to an active
2210 * session, and right before session "start".
2211 * "lazy" sync means we only sync if required.
2212 */
2213static
2214void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session *session)
2215{
2216 /* We can skip if session is not active */
2217 if (!session->active)
2218 return;
2219 lttng_session_sync_event_enablers(session);
2220}
2221
2222static
2223void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2224{
2225 lttng_sync_event_list(&event_notifier_group->sync_enablers_head,
2226 &event_notifier_group->unsync_enablers_head,
2227 &event_notifier_group->event_notifiers_head);
2228}
2229
2230static
2231void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2232{
2233 switch (event_enabler->enabler_type) {
2234 case LTTNG_EVENT_ENABLER_TYPE_RECORDER: /* Fall-through */
2235 case LTTNG_EVENT_ENABLER_TYPE_COUNTER:
2236 {
2237 struct lttng_event_enabler_session_common *event_enabler_session =
2238 caa_container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
2239 lttng_session_sync_event_enablers(event_enabler_session->chan->session);
2240 break;
2241 }
2242 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2243 {
2244 struct lttng_event_notifier_enabler *event_notifier_enabler =
2245 caa_container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2246 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2247 break;
2248 }
2249 default:
2250 WARN_ON_ONCE(1);
2251 }
2252}
2253
2254/*
2255 * Update all sessions with the given app context.
2256 * Called with ust lock held.
2257 * This is invoked when an application context gets loaded/unloaded. It
2258 * ensures the context callbacks are in sync with the application
2259 * context (either app context callbacks, or dummy callbacks).
2260 */
2261void lttng_ust_context_set_session_provider(const char *name,
2262 size_t (*get_size)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2263 size_t offset),
2264 void (*record)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2265 struct lttng_ust_ring_buffer_ctx *ctx,
2266 struct lttng_ust_channel_buffer *chan),
2267 void (*get_value)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2268 struct lttng_ust_ctx_value *value))
2269{
2270 struct lttng_ust_session_private *session_priv;
2271
2272 cds_list_for_each_entry(session_priv, &sessions, node) {
2273 struct lttng_ust_channel_buffer_private *chan;
2274 int ret;
2275
2276 ret = lttng_ust_context_set_provider_rcu(&session_priv->ctx,
2277 name, get_size, record, get_value);
2278 if (ret)
2279 abort();
2280 cds_list_for_each_entry(chan, &session_priv->chan_head, node) {
2281 ret = lttng_ust_context_set_provider_rcu(&chan->ctx,
2282 name, get_size, record, get_value);
2283 if (ret)
2284 abort();
2285 }
2286 }
2287}
2288
2289/*
2290 * Update all event_notifier groups with the given app context.
2291 * Called with ust lock held.
2292 * This is invoked when an application context gets loaded/unloaded. It
2293 * ensures the context callbacks are in sync with the application
2294 * context (either app context callbacks, or dummy callbacks).
2295 */
2296void lttng_ust_context_set_event_notifier_group_provider(const char *name,
2297 size_t (*get_size)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2298 size_t offset),
2299 void (*record)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2300 struct lttng_ust_ring_buffer_ctx *ctx,
2301 struct lttng_ust_channel_buffer *chan),
2302 void (*get_value)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
2303 struct lttng_ust_ctx_value *value))
2304{
2305 struct lttng_event_notifier_group *event_notifier_group;
2306
2307 cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2308 int ret;
2309
2310 ret = lttng_ust_context_set_provider_rcu(
2311 &event_notifier_group->ctx,
2312 name, get_size, record, get_value);
2313 if (ret)
2314 abort();
2315 }
2316}
2317
2318int lttng_ust_session_uuid_validate(struct lttng_ust_session *session,
2319 unsigned char *uuid)
2320{
2321 if (!session)
2322 return 0;
2323 /* Compare UUID with session. */
2324 if (session->priv->uuid_set) {
2325 if (memcmp(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN)) {
2326 return -1;
2327 }
2328 } else {
2329 memcpy(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN);
2330 session->priv->uuid_set = true;
2331 }
2332 return 0;
2333
2334}
LTTng 2.0 Userspace Tracer
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