Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
4442bc1b | 39 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 40 | #include <lttng/tracer.h> |
4442bc1b | 41 | #include <lttng/trigger-notification.h> |
2df37e95 MD |
42 | #include <lttng/abi-old.h> |
43 | #include <lttng/endian.h> | |
44 | #include <lttng/string-utils.h> | |
4442bc1b | 45 | #include <lttng/utils.h> |
24591303 MD |
46 | #include <ringbuffer/backend.h> |
47 | #include <ringbuffer/frontend.h> | |
3636085f | 48 | #include <wrapper/time.h> |
4e3c1b9b | 49 | |
d83004aa JD |
50 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
51 | ||
4e3c1b9b | 52 | static LIST_HEAD(sessions); |
4442bc1b | 53 | static LIST_HEAD(trigger_groups); |
a90917c3 | 54 | static LIST_HEAD(lttng_transport_list); |
4442bc1b | 55 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
56 | /* |
57 | * Protect the sessions and metadata caches. | |
58 | */ | |
4e3c1b9b MD |
59 | static DEFINE_MUTEX(sessions_mutex); |
60 | static struct kmem_cache *event_cache; | |
4442bc1b | 61 | static struct kmem_cache *trigger_cache; |
4e3c1b9b | 62 | |
4442bc1b JR |
63 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
64 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
65 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
66 | static void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler *trigger_enabler); | |
67 | static void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group); | |
3c997079 | 68 | |
a90917c3 | 69 | static void _lttng_event_destroy(struct lttng_event *event); |
4442bc1b | 70 | static void _lttng_trigger_destroy(struct lttng_trigger *trigger); |
a90917c3 MD |
71 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
72 | static int _lttng_event_unregister(struct lttng_event *event); | |
4442bc1b | 73 | static int _lttng_trigger_unregister(struct lttng_trigger *trigger); |
c099397a | 74 | static |
a90917c3 MD |
75 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
76 | struct lttng_channel *chan, | |
77 | struct lttng_event *event); | |
c099397a | 78 | static |
a90917c3 | 79 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
80 | static |
81 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 82 | static |
ceabb767 MD |
83 | int _lttng_type_statedump(struct lttng_session *session, |
84 | const struct lttng_type *type, | |
85 | size_t nesting); | |
86 | static | |
f513b2bf MD |
87 | int _lttng_field_statedump(struct lttng_session *session, |
88 | const struct lttng_event_field *field, | |
89 | size_t nesting); | |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
92da05ce MJ |
93 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
94 | synchronize_rcu(); | |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
92da05ce MJ |
97 | #endif |
98 | ||
b8590f40 MD |
99 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
100 | #ifdef CONFIG_PREEMPT_RT_FULL | |
101 | synchronize_rcu(); | |
102 | #endif | |
103 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
b8590f40 | 107 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
4442bc1b JR |
120 | static struct lttng_transport *lttng_transport_find(const char *name) |
121 | { | |
122 | struct lttng_transport *transport; | |
123 | ||
124 | list_for_each_entry(transport, <tng_transport_list, node) { | |
125 | if (!strcmp(transport->name, name)) | |
126 | return transport; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
3c997079 MD |
131 | /* |
132 | * Called with sessions lock held. | |
133 | */ | |
134 | int lttng_session_active(void) | |
135 | { | |
136 | struct lttng_session *iter; | |
137 | ||
138 | list_for_each_entry(iter, &sessions, list) { | |
139 | if (iter->active) | |
140 | return 1; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
a90917c3 | 145 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 146 | { |
a90917c3 | 147 | struct lttng_session *session; |
d83004aa | 148 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 149 | int i; |
4e3c1b9b MD |
150 | |
151 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 152 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 153 | if (!session) |
d83004aa | 154 | goto err; |
4e3c1b9b | 155 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 156 | INIT_LIST_HEAD(&session->events); |
a7008254 | 157 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
158 | |
159 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
160 | GFP_KERNEL); | |
161 | if (!metadata_cache) | |
162 | goto err_free_session; | |
0ca42eb7 | 163 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
164 | if (!metadata_cache->data) |
165 | goto err_free_cache; | |
166 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
167 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 168 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
169 | session->metadata_cache = metadata_cache; |
170 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
171 | memcpy(&metadata_cache->uuid, &session->uuid, |
172 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
173 | INIT_LIST_HEAD(&session->enablers_head); |
174 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
175 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 176 | list_add(&session->list, &sessions); |
d1f652f8 MD |
177 | session->pid_tracker.session = session; |
178 | session->pid_tracker.tracker_type = TRACKER_PID; | |
179 | session->vpid_tracker.session = session; | |
180 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
181 | session->uid_tracker.session = session; | |
182 | session->uid_tracker.tracker_type = TRACKER_UID; | |
183 | session->vuid_tracker.session = session; | |
184 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
185 | session->gid_tracker.session = session; | |
186 | session->gid_tracker.tracker_type = TRACKER_GID; | |
187 | session->vgid_tracker.session = session; | |
188 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
189 | mutex_unlock(&sessions_mutex); |
190 | return session; | |
d83004aa JD |
191 | |
192 | err_free_cache: | |
193 | kfree(metadata_cache); | |
194 | err_free_session: | |
48f5e0b5 | 195 | lttng_kvfree(session); |
d83004aa JD |
196 | err: |
197 | mutex_unlock(&sessions_mutex); | |
198 | return NULL; | |
199 | } | |
200 | ||
4442bc1b JR |
201 | static |
202 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
203 | { | |
204 | struct lttng_counter_transport *transport; | |
205 | ||
206 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
207 | if (!strcmp(transport->name, name)) | |
208 | return transport; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | struct lttng_counter *lttng_kernel_counter_create( | |
214 | const char *counter_transport_name, | |
215 | size_t number_dimensions, const size_t *dimensions_sizes) | |
216 | { | |
217 | struct lttng_counter *counter = NULL; | |
218 | struct lttng_counter_transport *counter_transport = NULL; | |
219 | ||
220 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
221 | if (!counter_transport) { | |
222 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
223 | counter_transport_name); | |
224 | goto notransport; | |
225 | } | |
226 | if (!try_module_get(counter_transport->owner)) { | |
227 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
228 | goto notransport; | |
229 | } | |
230 | ||
231 | counter = kzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
232 | if (!counter) | |
233 | goto nomem; | |
234 | ||
235 | /* Create trigger error counter. */ | |
236 | counter->ops = &counter_transport->ops; | |
237 | counter->transport = counter_transport; | |
238 | ||
239 | counter->counter = counter->ops->counter_create( | |
240 | number_dimensions, dimensions_sizes, 0); | |
241 | if (!counter->counter) { | |
242 | goto create_error; | |
243 | } | |
244 | ||
245 | return counter; | |
246 | ||
247 | create_error: | |
248 | kfree(counter); | |
249 | nomem: | |
250 | if (counter_transport) | |
251 | module_put(counter_transport->owner); | |
252 | notransport: | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | struct lttng_trigger_group *lttng_trigger_group_create(void) | |
257 | { | |
258 | struct lttng_transport *transport = NULL; | |
259 | struct lttng_trigger_group *trigger_group; | |
260 | const char *transport_name = "relay-trigger"; | |
261 | size_t subbuf_size = 4096; //TODO | |
262 | size_t num_subbuf = 16; //TODO | |
263 | unsigned int switch_timer_interval = 0; | |
264 | unsigned int read_timer_interval = 0; | |
265 | int i; | |
266 | ||
267 | mutex_lock(&sessions_mutex); | |
268 | ||
269 | transport = lttng_transport_find(transport_name); | |
270 | if (!transport) { | |
271 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
272 | transport_name); | |
273 | goto notransport; | |
274 | } | |
275 | if (!try_module_get(transport->owner)) { | |
276 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); | |
277 | goto notransport; | |
278 | } | |
279 | ||
280 | trigger_group = lttng_kvzalloc(sizeof(struct lttng_trigger_group), | |
281 | GFP_KERNEL); | |
282 | if (!trigger_group) | |
283 | goto nomem; | |
284 | ||
285 | trigger_group->ops = &transport->ops; | |
286 | trigger_group->chan = transport->ops.channel_create(transport_name, | |
287 | trigger_group, NULL, subbuf_size, num_subbuf, | |
288 | switch_timer_interval, read_timer_interval); | |
289 | if (!trigger_group->chan) | |
290 | goto create_error; | |
291 | ||
292 | trigger_group->transport = transport; | |
293 | INIT_LIST_HEAD(&trigger_group->enablers_head); | |
294 | INIT_LIST_HEAD(&trigger_group->triggers_head); | |
295 | for (i = 0; i < LTTNG_TRIGGER_HT_SIZE; i++) | |
296 | INIT_HLIST_HEAD(&trigger_group->triggers_ht.table[i]); | |
297 | ||
298 | list_add(&trigger_group->node, &trigger_groups); | |
299 | mutex_unlock(&sessions_mutex); | |
300 | ||
301 | return trigger_group; | |
302 | ||
303 | create_error: | |
304 | lttng_kvfree(trigger_group); | |
305 | nomem: | |
306 | if (transport) | |
307 | module_put(transport->owner); | |
308 | notransport: | |
309 | mutex_unlock(&sessions_mutex); | |
310 | return NULL; | |
311 | } | |
312 | ||
d83004aa JD |
313 | void metadata_cache_destroy(struct kref *kref) |
314 | { | |
315 | struct lttng_metadata_cache *cache = | |
316 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 317 | vfree(cache->data); |
d83004aa | 318 | kfree(cache); |
4e3c1b9b MD |
319 | } |
320 | ||
a90917c3 | 321 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 322 | { |
a90917c3 MD |
323 | struct lttng_channel *chan, *tmpchan; |
324 | struct lttng_event *event, *tmpevent; | |
d83004aa | 325 | struct lttng_metadata_stream *metadata_stream; |
4442bc1b | 326 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 327 | int ret; |
4e3c1b9b MD |
328 | |
329 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 330 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 331 | list_for_each_entry(chan, &session->chan, list) { |
4442bc1b | 332 | ret = lttng_syscalls_unregister_event(chan); |
1ec65de1 MD |
333 | WARN_ON(ret); |
334 | } | |
dda6a249 | 335 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 336 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
337 | WARN_ON(ret); |
338 | } | |
abcca994 | 339 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 340 | list_for_each_entry(chan, &session->chan, list) { |
4442bc1b | 341 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
342 | WARN_ON(ret); |
343 | } | |
4442bc1b | 344 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 345 | &session->enablers_head, node) |
4442bc1b | 346 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 347 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 348 | _lttng_event_destroy(event); |
d83004aa JD |
349 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
350 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 351 | _lttng_channel_destroy(chan); |
d83004aa | 352 | } |
ab036a63 | 353 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
354 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
355 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 356 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
357 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
358 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
359 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
360 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
361 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
362 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 363 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
364 | list_del(&session->list); |
365 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 366 | lttng_kvfree(session); |
4e3c1b9b MD |
367 | } |
368 | ||
4442bc1b JR |
369 | void lttng_trigger_group_destroy(struct lttng_trigger_group *trigger_group) |
370 | { | |
371 | struct lttng_trigger_enabler *trigger_enabler, *tmp_trigger_enabler; | |
372 | struct lttng_trigger *trigger, *tmptrigger; | |
373 | int ret; | |
374 | ||
375 | if (!trigger_group) | |
376 | return; | |
377 | ||
378 | mutex_lock(&sessions_mutex); | |
379 | ||
380 | ret = lttng_syscalls_unregister_trigger(trigger_group); | |
381 | WARN_ON(ret); | |
382 | ||
383 | list_for_each_entry_safe(trigger, tmptrigger, | |
384 | &trigger_group->triggers_head, list) { | |
385 | ret = _lttng_trigger_unregister(trigger); | |
386 | WARN_ON(ret); | |
387 | } | |
388 | ||
389 | synchronize_trace(); /* Wait for in-flight triggers to complete */ | |
390 | ||
391 | irq_work_sync(&trigger_group->wakeup_pending); | |
392 | ||
393 | list_for_each_entry_safe(trigger_enabler, tmp_trigger_enabler, | |
394 | &trigger_group->enablers_head, node) | |
395 | lttng_trigger_enabler_destroy(trigger_enabler); | |
396 | ||
397 | list_for_each_entry_safe(trigger, tmptrigger, | |
398 | &trigger_group->triggers_head, list) | |
399 | _lttng_trigger_destroy(trigger); | |
400 | ||
401 | if (trigger_group->error_counter) { | |
402 | struct lttng_counter *error_counter = trigger_group->error_counter; | |
403 | error_counter->ops->counter_destroy(error_counter->counter); | |
404 | module_put(error_counter->transport->owner); | |
405 | lttng_kvfree(error_counter); | |
406 | trigger_group->error_counter = NULL; | |
407 | } | |
408 | trigger_group->ops->channel_destroy(trigger_group->chan); | |
409 | module_put(trigger_group->transport->owner); | |
410 | list_del(&trigger_group->node); | |
411 | mutex_unlock(&sessions_mutex); | |
412 | lttng_kvfree(trigger_group); | |
413 | } | |
414 | ||
601252cf MD |
415 | int lttng_session_statedump(struct lttng_session *session) |
416 | { | |
417 | int ret; | |
418 | ||
419 | mutex_lock(&sessions_mutex); | |
420 | ret = lttng_statedump_start(session); | |
421 | mutex_unlock(&sessions_mutex); | |
422 | return ret; | |
423 | } | |
424 | ||
a90917c3 | 425 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
426 | { |
427 | int ret = 0; | |
a90917c3 | 428 | struct lttng_channel *chan; |
c0e31d2e MD |
429 | |
430 | mutex_lock(&sessions_mutex); | |
431 | if (session->active) { | |
432 | ret = -EBUSY; | |
433 | goto end; | |
434 | } | |
c099397a | 435 | |
3c997079 MD |
436 | /* Set transient enabler state to "enabled" */ |
437 | session->tstate = 1; | |
438 | ||
4ef81e4a | 439 | /* We need to sync enablers with session before activation. */ |
4442bc1b | 440 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 441 | |
c099397a MD |
442 | /* |
443 | * Snapshot the number of events per channel to know the type of header | |
444 | * we need to use. | |
445 | */ | |
446 | list_for_each_entry(chan, &session->chan, list) { | |
447 | if (chan->header_type) | |
448 | continue; /* don't change it if session stop/restart */ | |
449 | if (chan->free_event_id < 31) | |
450 | chan->header_type = 1; /* compact */ | |
451 | else | |
452 | chan->header_type = 2; /* large */ | |
453 | } | |
454 | ||
64af2437 | 455 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
456 | list_for_each_entry(chan, &session->chan, list) { |
457 | if (chan->channel_type != METADATA_CHANNEL) | |
458 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
459 | } | |
64af2437 | 460 | |
a8f2d0c7 MJ |
461 | WRITE_ONCE(session->active, 1); |
462 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 463 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 464 | if (ret) { |
a8f2d0c7 | 465 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
466 | goto end; |
467 | } | |
468 | ret = lttng_statedump_start(session); | |
360f38ea | 469 | if (ret) |
a8f2d0c7 | 470 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
471 | end: |
472 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 473 | return ret; |
c0e31d2e MD |
474 | } |
475 | ||
a90917c3 | 476 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
477 | { |
478 | int ret = 0; | |
64af2437 | 479 | struct lttng_channel *chan; |
c0e31d2e MD |
480 | |
481 | mutex_lock(&sessions_mutex); | |
482 | if (!session->active) { | |
483 | ret = -EBUSY; | |
484 | goto end; | |
485 | } | |
a8f2d0c7 | 486 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
487 | |
488 | /* Set transient enabler state to "disabled" */ | |
489 | session->tstate = 0; | |
4442bc1b | 490 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
491 | |
492 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
493 | list_for_each_entry(chan, &session->chan, list) { |
494 | if (chan->channel_type != METADATA_CHANNEL) | |
495 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
496 | } | |
c0e31d2e MD |
497 | end: |
498 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 499 | return ret; |
c0e31d2e MD |
500 | } |
501 | ||
9616f0bf JD |
502 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
503 | { | |
504 | int ret = 0; | |
505 | struct lttng_channel *chan; | |
506 | struct lttng_event *event; | |
507 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
508 | struct lttng_metadata_stream *stream; | |
509 | ||
510 | mutex_lock(&sessions_mutex); | |
511 | if (!session->active) { | |
512 | ret = -EBUSY; | |
513 | goto end; | |
514 | } | |
515 | ||
516 | mutex_lock(&cache->lock); | |
517 | memset(cache->data, 0, cache->cache_alloc); | |
518 | cache->metadata_written = 0; | |
519 | cache->version++; | |
520 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
521 | stream->metadata_out = 0; | |
522 | stream->metadata_in = 0; | |
523 | } | |
524 | mutex_unlock(&cache->lock); | |
525 | ||
526 | session->metadata_dumped = 0; | |
527 | list_for_each_entry(chan, &session->chan, list) { | |
528 | chan->metadata_dumped = 0; | |
529 | } | |
530 | ||
531 | list_for_each_entry(event, &session->events, list) { | |
532 | event->metadata_dumped = 0; | |
533 | } | |
534 | ||
535 | ret = _lttng_session_metadata_statedump(session); | |
536 | ||
537 | end: | |
538 | mutex_unlock(&sessions_mutex); | |
539 | return ret; | |
540 | } | |
541 | ||
a90917c3 | 542 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 543 | { |
3c997079 | 544 | int ret = 0; |
e64957da | 545 | |
3c997079 MD |
546 | mutex_lock(&sessions_mutex); |
547 | if (channel->channel_type == METADATA_CHANNEL) { | |
548 | ret = -EPERM; | |
549 | goto end; | |
550 | } | |
551 | if (channel->enabled) { | |
552 | ret = -EEXIST; | |
553 | goto end; | |
554 | } | |
555 | /* Set transient enabler state to "enabled" */ | |
556 | channel->tstate = 1; | |
4442bc1b | 557 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 558 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 559 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
560 | end: |
561 | mutex_unlock(&sessions_mutex); | |
562 | return ret; | |
e64957da MD |
563 | } |
564 | ||
a90917c3 | 565 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 566 | { |
3c997079 | 567 | int ret = 0; |
e64957da | 568 | |
3c997079 MD |
569 | mutex_lock(&sessions_mutex); |
570 | if (channel->channel_type == METADATA_CHANNEL) { | |
571 | ret = -EPERM; | |
572 | goto end; | |
573 | } | |
574 | if (!channel->enabled) { | |
575 | ret = -EEXIST; | |
576 | goto end; | |
577 | } | |
578 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 579 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
580 | /* Set transient enabler state to "enabled" */ |
581 | channel->tstate = 0; | |
4442bc1b | 582 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
583 | end: |
584 | mutex_unlock(&sessions_mutex); | |
585 | return ret; | |
e64957da MD |
586 | } |
587 | ||
a90917c3 | 588 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 589 | { |
3c997079 | 590 | int ret = 0; |
e64957da | 591 | |
3c997079 MD |
592 | mutex_lock(&sessions_mutex); |
593 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
594 | ret = -EPERM; | |
595 | goto end; | |
596 | } | |
597 | if (event->enabled) { | |
598 | ret = -EEXIST; | |
599 | goto end; | |
600 | } | |
a0493bef MD |
601 | switch (event->instrumentation) { |
602 | case LTTNG_KERNEL_TRACEPOINT: | |
603 | case LTTNG_KERNEL_SYSCALL: | |
604 | ret = -EINVAL; | |
605 | break; | |
606 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 607 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 608 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 609 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
610 | break; |
611 | case LTTNG_KERNEL_KRETPROBE: | |
612 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
613 | break; | |
e884017c | 614 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
615 | default: |
616 | WARN_ON_ONCE(1); | |
617 | ret = -EINVAL; | |
618 | } | |
3c997079 MD |
619 | end: |
620 | mutex_unlock(&sessions_mutex); | |
621 | return ret; | |
e64957da MD |
622 | } |
623 | ||
a90917c3 | 624 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 625 | { |
3c997079 | 626 | int ret = 0; |
e64957da | 627 | |
3c997079 MD |
628 | mutex_lock(&sessions_mutex); |
629 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
630 | ret = -EPERM; | |
631 | goto end; | |
632 | } | |
633 | if (!event->enabled) { | |
634 | ret = -EEXIST; | |
635 | goto end; | |
636 | } | |
a0493bef MD |
637 | switch (event->instrumentation) { |
638 | case LTTNG_KERNEL_TRACEPOINT: | |
639 | case LTTNG_KERNEL_SYSCALL: | |
640 | ret = -EINVAL; | |
641 | break; | |
642 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 643 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 644 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 645 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
646 | break; |
647 | case LTTNG_KERNEL_KRETPROBE: | |
648 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
649 | break; | |
e884017c | 650 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
651 | default: |
652 | WARN_ON_ONCE(1); | |
653 | ret = -EINVAL; | |
654 | } | |
3c997079 MD |
655 | end: |
656 | mutex_unlock(&sessions_mutex); | |
657 | return ret; | |
e64957da MD |
658 | } |
659 | ||
4442bc1b | 660 | int lttng_trigger_enable(struct lttng_trigger *trigger) |
f3d01b96 | 661 | { |
4442bc1b | 662 | int ret = 0; |
f3d01b96 | 663 | |
4442bc1b JR |
664 | mutex_lock(&sessions_mutex); |
665 | if (trigger->enabled) { | |
666 | ret = -EEXIST; | |
667 | goto end; | |
f3d01b96 | 668 | } |
4442bc1b JR |
669 | switch (trigger->instrumentation) { |
670 | case LTTNG_KERNEL_TRACEPOINT: | |
671 | case LTTNG_KERNEL_SYSCALL: | |
672 | ret = -EINVAL; | |
673 | break; | |
674 | case LTTNG_KERNEL_KPROBE: | |
675 | case LTTNG_KERNEL_UPROBE: | |
676 | WRITE_ONCE(trigger->enabled, 1); | |
677 | break; | |
678 | case LTTNG_KERNEL_FUNCTION: | |
679 | case LTTNG_KERNEL_NOOP: | |
680 | case LTTNG_KERNEL_KRETPROBE: | |
681 | default: | |
682 | WARN_ON_ONCE(1); | |
683 | ret = -EINVAL; | |
684 | } | |
685 | end: | |
686 | mutex_unlock(&sessions_mutex); | |
687 | return ret; | |
688 | } | |
689 | ||
690 | int lttng_trigger_disable(struct lttng_trigger *trigger) | |
691 | { | |
692 | int ret = 0; | |
693 | ||
694 | mutex_lock(&sessions_mutex); | |
695 | if (!trigger->enabled) { | |
696 | ret = -EEXIST; | |
697 | goto end; | |
698 | } | |
699 | switch (trigger->instrumentation) { | |
700 | case LTTNG_KERNEL_TRACEPOINT: | |
701 | case LTTNG_KERNEL_SYSCALL: | |
702 | ret = -EINVAL; | |
703 | break; | |
704 | case LTTNG_KERNEL_KPROBE: | |
705 | case LTTNG_KERNEL_UPROBE: | |
706 | WRITE_ONCE(trigger->enabled, 0); | |
707 | break; | |
708 | case LTTNG_KERNEL_FUNCTION: | |
709 | case LTTNG_KERNEL_NOOP: | |
710 | case LTTNG_KERNEL_KRETPROBE: | |
711 | default: | |
712 | WARN_ON_ONCE(1); | |
713 | ret = -EINVAL; | |
714 | } | |
715 | end: | |
716 | mutex_unlock(&sessions_mutex); | |
717 | return ret; | |
f3d01b96 MD |
718 | } |
719 | ||
a90917c3 | 720 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
721 | const char *transport_name, |
722 | void *buf_addr, | |
4e3c1b9b MD |
723 | size_t subbuf_size, size_t num_subbuf, |
724 | unsigned int switch_timer_interval, | |
d83004aa JD |
725 | unsigned int read_timer_interval, |
726 | enum channel_type channel_type) | |
4e3c1b9b | 727 | { |
a90917c3 MD |
728 | struct lttng_channel *chan; |
729 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
730 | |
731 | mutex_lock(&sessions_mutex); | |
d83004aa | 732 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 733 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 734 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 735 | if (!transport) { |
5a15f70c | 736 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 737 | transport_name); |
c0e31d2e | 738 | goto notransport; |
f3d01b96 | 739 | } |
a33c9927 | 740 | if (!try_module_get(transport->owner)) { |
5a15f70c | 741 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
742 | goto notransport; |
743 | } | |
a90917c3 | 744 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 745 | if (!chan) |
c0e31d2e | 746 | goto nomem; |
4e3c1b9b | 747 | chan->session = session; |
05d32c64 | 748 | chan->id = session->free_chan_id++; |
3b731ab1 | 749 | chan->ops = &transport->ops; |
125b4df4 MD |
750 | /* |
751 | * Note: the channel creation op already writes into the packet | |
752 | * headers. Therefore the "chan" information used as input | |
753 | * should be already accessible. | |
754 | */ | |
5f5ddf01 MD |
755 | chan->chan = transport->ops.channel_create(transport_name, |
756 | chan, buf_addr, subbuf_size, num_subbuf, | |
757 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
758 | if (!chan->chan) |
759 | goto create_error; | |
3c997079 | 760 | chan->tstate = 1; |
e64957da | 761 | chan->enabled = 1; |
a33c9927 | 762 | chan->transport = transport; |
d83004aa | 763 | chan->channel_type = channel_type; |
4e3c1b9b MD |
764 | list_add(&chan->list, &session->chan); |
765 | mutex_unlock(&sessions_mutex); | |
766 | return chan; | |
767 | ||
f3d01b96 MD |
768 | create_error: |
769 | kfree(chan); | |
c0e31d2e | 770 | nomem: |
a33c9927 MD |
771 | if (transport) |
772 | module_put(transport->owner); | |
c0e31d2e | 773 | notransport: |
e5382b6d | 774 | active: |
4e3c1b9b MD |
775 | mutex_unlock(&sessions_mutex); |
776 | return NULL; | |
777 | } | |
778 | ||
779 | /* | |
d83004aa JD |
780 | * Only used internally at session destruction for per-cpu channels, and |
781 | * when metadata channel is released. | |
782 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 783 | */ |
aa7c23a9 | 784 | static |
a90917c3 | 785 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 786 | { |
11b5a3c2 | 787 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 788 | module_put(chan->transport->owner); |
4e3c1b9b | 789 | list_del(&chan->list); |
8070f5c0 | 790 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
791 | kfree(chan); |
792 | } | |
793 | ||
d83004aa JD |
794 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
795 | { | |
796 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
797 | ||
798 | /* Protect the metadata cache with the sessions_mutex. */ | |
799 | mutex_lock(&sessions_mutex); | |
800 | _lttng_channel_destroy(chan); | |
801 | mutex_unlock(&sessions_mutex); | |
802 | } | |
803 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
804 | ||
805 | static | |
806 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
807 | { | |
808 | stream->finalized = 1; | |
809 | wake_up_interruptible(&stream->read_wait); | |
810 | } | |
811 | ||
4442bc1b | 812 | |
e5382b6d MD |
813 | /* |
814 | * Supports event creation while tracing session is active. | |
3c997079 | 815 | * Needs to be called with sessions mutex held. |
e5382b6d | 816 | */ |
3c997079 MD |
817 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
818 | struct lttng_kernel_event *event_param, | |
819 | void *filter, | |
820 | const struct lttng_event_desc *event_desc, | |
821 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 822 | { |
3c997079 | 823 | struct lttng_session *session = chan->session; |
a90917c3 | 824 | struct lttng_event *event; |
3c997079 MD |
825 | const char *event_name; |
826 | struct hlist_head *head; | |
3d084699 | 827 | int ret; |
4e3c1b9b | 828 | |
abc0446a | 829 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 830 | ret = -EMFILE; |
e5382b6d | 831 | goto full; |
abc0446a | 832 | } |
3c997079 MD |
833 | |
834 | switch (itype) { | |
835 | case LTTNG_KERNEL_TRACEPOINT: | |
836 | event_name = event_desc->name; | |
837 | break; | |
838 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 839 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 840 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 841 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 842 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
843 | event_name = event_param->name; |
844 | break; | |
e884017c | 845 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
846 | default: |
847 | WARN_ON_ONCE(1); | |
848 | ret = -EINVAL; | |
849 | goto type_error; | |
850 | } | |
4442bc1b JR |
851 | |
852 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
853 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 854 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
855 | WARN_ON_ONCE(!event->desc); |
856 | if (!strncmp(event->desc->name, event_name, | |
857 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
858 | && chan == event->chan) { | |
859 | ret = -EEXIST; | |
860 | goto exist; | |
abc0446a MD |
861 | } |
862 | } | |
3c997079 | 863 | |
11b5a3c2 | 864 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 865 | if (!event) { |
4cf0bf51 | 866 | ret = -ENOMEM; |
4e3c1b9b | 867 | goto cache_error; |
abc0446a | 868 | } |
4e3c1b9b MD |
869 | event->chan = chan; |
870 | event->filter = filter; | |
e5382b6d | 871 | event->id = chan->free_event_id++; |
3c997079 MD |
872 | event->instrumentation = itype; |
873 | event->evtype = LTTNG_TYPE_EVENT; | |
4442bc1b | 874 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
875 | INIT_LIST_HEAD(&event->enablers_ref_head); |
876 | ||
877 | switch (itype) { | |
ab2277d6 | 878 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
879 | /* Event will be enabled by enabler sync. */ |
880 | event->enabled = 0; | |
881 | event->registered = 0; | |
4442bc1b | 882 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 883 | if (!event->desc) { |
4cf0bf51 | 884 | ret = -ENOENT; |
d3dbe23c | 885 | goto register_error; |
abc0446a | 886 | } |
3c997079 MD |
887 | /* Populate lttng_event structure before event registration. */ |
888 | smp_wmb(); | |
baf20995 | 889 | break; |
ab2277d6 | 890 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
891 | /* |
892 | * Needs to be explicitly enabled after creation, since | |
893 | * we may want to apply filters. | |
894 | */ | |
895 | event->enabled = 0; | |
3c997079 MD |
896 | event->registered = 1; |
897 | /* | |
898 | * Populate lttng_event structure before event | |
899 | * registration. | |
900 | */ | |
901 | smp_wmb(); | |
4442bc1b | 902 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
903 | event_param->u.kprobe.symbol_name, |
904 | event_param->u.kprobe.offset, | |
905 | event_param->u.kprobe.addr, | |
906 | event); | |
abc0446a | 907 | if (ret) { |
4cf0bf51 | 908 | ret = -EINVAL; |
d6d808f3 | 909 | goto register_error; |
abc0446a | 910 | } |
edeb3137 MD |
911 | ret = try_module_get(event->desc->owner); |
912 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 913 | break; |
7371f44c MD |
914 | case LTTNG_KERNEL_KRETPROBE: |
915 | { | |
a90917c3 | 916 | struct lttng_event *event_return; |
7371f44c MD |
917 | |
918 | /* kretprobe defines 2 events */ | |
a0493bef MD |
919 | /* |
920 | * Needs to be explicitly enabled after creation, since | |
921 | * we may want to apply filters. | |
922 | */ | |
923 | event->enabled = 0; | |
3c997079 | 924 | event->registered = 1; |
7371f44c MD |
925 | event_return = |
926 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 927 | if (!event_return) { |
4cf0bf51 | 928 | ret = -ENOMEM; |
7371f44c | 929 | goto register_error; |
abc0446a | 930 | } |
7371f44c MD |
931 | event_return->chan = chan; |
932 | event_return->filter = filter; | |
933 | event_return->id = chan->free_event_id++; | |
a0493bef | 934 | event_return->enabled = 0; |
3c997079 MD |
935 | event_return->registered = 1; |
936 | event_return->instrumentation = itype; | |
7371f44c | 937 | /* |
a90917c3 | 938 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
939 | */ |
940 | smp_wmb(); | |
3c997079 | 941 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
942 | event_param->u.kretprobe.symbol_name, |
943 | event_param->u.kretprobe.offset, | |
944 | event_param->u.kretprobe.addr, | |
945 | event, event_return); | |
946 | if (ret) { | |
947 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 948 | ret = -EINVAL; |
7371f44c MD |
949 | goto register_error; |
950 | } | |
951 | /* Take 2 refs on the module: one per event. */ | |
952 | ret = try_module_get(event->desc->owner); | |
953 | WARN_ON_ONCE(!ret); | |
954 | ret = try_module_get(event->desc->owner); | |
955 | WARN_ON_ONCE(!ret); | |
a90917c3 | 956 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 957 | event_return); |
abc0446a | 958 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
959 | if (ret) { |
960 | kmem_cache_free(event_cache, event_return); | |
961 | module_put(event->desc->owner); | |
962 | module_put(event->desc->owner); | |
963 | goto statedump_error; | |
964 | } | |
965 | list_add(&event_return->list, &chan->session->events); | |
966 | break; | |
967 | } | |
1ec65de1 | 968 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 969 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
970 | /* |
971 | * Needs to be explicitly enabled after creation, since | |
972 | * we may want to apply filters. | |
973 | */ | |
974 | event->enabled = 0; | |
3c997079 MD |
975 | event->registered = 0; |
976 | event->desc = event_desc; | |
badfe9f5 MD |
977 | switch (event_param->u.syscall.entryexit) { |
978 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
979 | ret = -EINVAL; | |
980 | goto register_error; | |
981 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
982 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
983 | break; | |
984 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
985 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
986 | break; | |
987 | } | |
988 | switch (event_param->u.syscall.abi) { | |
989 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
990 | ret = -EINVAL; | |
991 | goto register_error; | |
992 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
993 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
994 | break; | |
995 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
996 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
997 | break; | |
998 | } | |
abc0446a | 999 | if (!event->desc) { |
4cf0bf51 | 1000 | ret = -EINVAL; |
259b6cb3 | 1001 | goto register_error; |
abc0446a | 1002 | } |
1ec65de1 | 1003 | break; |
149b9a9d | 1004 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1005 | /* |
1006 | * Needs to be explicitly enabled after creation, since | |
1007 | * we may want to apply filters. | |
1008 | */ | |
1009 | event->enabled = 0; | |
1010 | event->registered = 1; | |
3aed4dca | 1011 | |
a344f64b FD |
1012 | /* |
1013 | * Populate lttng_event structure before event | |
1014 | * registration. | |
1015 | */ | |
1016 | smp_wmb(); | |
149b9a9d | 1017 | |
4442bc1b | 1018 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1019 | event_param->u.uprobe.fd, |
149b9a9d YB |
1020 | event); |
1021 | if (ret) | |
1022 | goto register_error; | |
1023 | ret = try_module_get(event->desc->owner); | |
1024 | WARN_ON_ONCE(!ret); | |
1025 | break; | |
e884017c | 1026 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1027 | default: |
1028 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1029 | ret = -EINVAL; |
df07930b | 1030 | goto register_error; |
baf20995 | 1031 | } |
a90917c3 | 1032 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
1033 | WARN_ON_ONCE(ret > 0); |
1034 | if (ret) { | |
c099397a | 1035 | goto statedump_error; |
abc0446a | 1036 | } |
3c997079 | 1037 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1038 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1039 | return event; |
1040 | ||
c099397a | 1041 | statedump_error: |
259b6cb3 | 1042 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1043 | register_error: |
11b5a3c2 | 1044 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1045 | cache_error: |
1046 | exist: | |
3c997079 | 1047 | type_error: |
e5382b6d | 1048 | full: |
4cf0bf51 | 1049 | return ERR_PTR(ret); |
4e3c1b9b MD |
1050 | } |
1051 | ||
4442bc1b JR |
1052 | struct lttng_trigger *_lttng_trigger_create( |
1053 | const struct lttng_event_desc *event_desc, | |
1054 | uint64_t id, uint64_t error_counter_index, | |
1055 | struct lttng_trigger_group *trigger_group, | |
1056 | struct lttng_kernel_trigger *trigger_param, void *filter, | |
1057 | enum lttng_kernel_instrumentation itype) | |
1058 | { | |
1059 | struct lttng_trigger *trigger; | |
1060 | const char *event_name; | |
1061 | struct hlist_head *head; | |
1062 | int ret; | |
1063 | size_t dimension_index[1]; | |
1064 | ||
1065 | switch (itype) { | |
1066 | case LTTNG_KERNEL_TRACEPOINT: | |
1067 | event_name = event_desc->name; | |
1068 | break; | |
1069 | case LTTNG_KERNEL_KPROBE: | |
1070 | case LTTNG_KERNEL_UPROBE: | |
1071 | case LTTNG_KERNEL_SYSCALL: | |
1072 | event_name = trigger_param->name; | |
1073 | break; | |
1074 | case LTTNG_KERNEL_KRETPROBE: | |
1075 | case LTTNG_KERNEL_FUNCTION: | |
1076 | case LTTNG_KERNEL_NOOP: | |
1077 | default: | |
1078 | WARN_ON_ONCE(1); | |
1079 | ret = -EINVAL; | |
1080 | goto type_error; | |
1081 | } | |
1082 | ||
1083 | head = utils_borrow_hash_table_bucket(trigger_group->triggers_ht.table, | |
1084 | LTTNG_TRIGGER_HT_SIZE, event_name); | |
1085 | lttng_hlist_for_each_entry(trigger, head, hlist) { | |
1086 | WARN_ON_ONCE(!trigger->desc); | |
1087 | if (!strncmp(trigger->desc->name, event_name, | |
1088 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1089 | && trigger_group == trigger->group | |
1090 | && id == trigger->id) { | |
1091 | ret = -EEXIST; | |
1092 | goto exist; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | trigger = kmem_cache_zalloc(trigger_cache, GFP_KERNEL); | |
1097 | if (!trigger) { | |
1098 | ret = -ENOMEM; | |
1099 | goto cache_error; | |
1100 | } | |
1101 | trigger->group = trigger_group; | |
1102 | trigger->id = id; | |
1103 | trigger->error_counter_index = error_counter_index; | |
1104 | trigger->num_captures = 0; | |
1105 | trigger->filter = filter; | |
1106 | trigger->instrumentation = itype; | |
1107 | trigger->evtype = LTTNG_TYPE_EVENT; | |
1108 | trigger->send_notification = lttng_trigger_notification_send; | |
1109 | INIT_LIST_HEAD(&trigger->filter_bytecode_runtime_head); | |
1110 | INIT_LIST_HEAD(&trigger->capture_bytecode_runtime_head); | |
1111 | INIT_LIST_HEAD(&trigger->enablers_ref_head); | |
1112 | ||
1113 | switch (itype) { | |
1114 | case LTTNG_KERNEL_TRACEPOINT: | |
1115 | /* Event will be enabled by enabler sync. */ | |
1116 | trigger->enabled = 0; | |
1117 | trigger->registered = 0; | |
1118 | trigger->desc = lttng_event_desc_get(event_name); | |
1119 | if (!trigger->desc) { | |
1120 | ret = -ENOENT; | |
1121 | goto register_error; | |
1122 | } | |
1123 | /* Populate lttng_trigger structure before event registration. */ | |
1124 | smp_wmb(); | |
1125 | break; | |
1126 | case LTTNG_KERNEL_KPROBE: | |
1127 | /* | |
1128 | * Needs to be explicitly enabled after creation, since | |
1129 | * we may want to apply filters. | |
1130 | */ | |
1131 | trigger->enabled = 0; | |
1132 | trigger->registered = 1; | |
1133 | /* | |
1134 | * Populate lttng_trigger structure before event | |
1135 | * registration. | |
1136 | */ | |
1137 | smp_wmb(); | |
1138 | ret = lttng_kprobes_register_trigger( | |
1139 | trigger_param->u.kprobe.symbol_name, | |
1140 | trigger_param->u.kprobe.offset, | |
1141 | trigger_param->u.kprobe.addr, | |
1142 | trigger); | |
1143 | if (ret) { | |
1144 | ret = -EINVAL; | |
1145 | goto register_error; | |
1146 | } | |
1147 | ret = try_module_get(trigger->desc->owner); | |
1148 | WARN_ON_ONCE(!ret); | |
1149 | break; | |
1150 | case LTTNG_KERNEL_NOOP: | |
1151 | case LTTNG_KERNEL_SYSCALL: | |
1152 | /* | |
1153 | * Needs to be explicitly enabled after creation, since | |
1154 | * we may want to apply filters. | |
1155 | */ | |
1156 | trigger->enabled = 0; | |
1157 | trigger->registered = 0; | |
1158 | trigger->desc = event_desc; | |
1159 | if (!trigger->desc) { | |
1160 | ret = -EINVAL; | |
1161 | goto register_error; | |
1162 | } | |
1163 | break; | |
1164 | case LTTNG_KERNEL_UPROBE: | |
1165 | /* | |
1166 | * Needs to be explicitly enabled after creation, since | |
1167 | * we may want to apply filters. | |
1168 | */ | |
1169 | trigger->enabled = 0; | |
1170 | trigger->registered = 1; | |
1171 | ||
1172 | /* | |
1173 | * Populate lttng_trigger structure before trigger | |
1174 | * registration. | |
1175 | */ | |
1176 | smp_wmb(); | |
1177 | ||
1178 | ret = lttng_uprobes_register_trigger(trigger_param->name, | |
1179 | trigger_param->u.uprobe.fd, | |
1180 | trigger); | |
1181 | if (ret) | |
1182 | goto register_error; | |
1183 | ret = try_module_get(trigger->desc->owner); | |
1184 | WARN_ON_ONCE(!ret); | |
1185 | break; | |
1186 | case LTTNG_KERNEL_KRETPROBE: | |
1187 | case LTTNG_KERNEL_FUNCTION: | |
1188 | default: | |
1189 | WARN_ON_ONCE(1); | |
1190 | ret = -EINVAL; | |
1191 | goto register_error; | |
1192 | } | |
1193 | ||
1194 | list_add(&trigger->list, &trigger_group->triggers_head); | |
1195 | hlist_add_head(&trigger->hlist, head); | |
1196 | ||
1197 | /* | |
1198 | * Clear the error counter bucket. The sessiond keeps track of which | |
1199 | * bucket is currently in use. We trust it. | |
1200 | */ | |
1201 | if (trigger_group->error_counter) { | |
1202 | /* | |
1203 | * Check that the index is within the boundary of the counter. | |
1204 | */ | |
1205 | if (trigger->error_counter_index >= trigger_group->error_counter_len) { | |
1206 | printk(KERN_INFO "LTTng: Trigger: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1207 | trigger_group->error_counter_len, trigger->error_counter_index); | |
1208 | ret = -EINVAL; | |
1209 | goto register_error; | |
1210 | } | |
1211 | ||
1212 | dimension_index[0] = trigger->error_counter_index; | |
1213 | ret = trigger_group->error_counter->ops->counter_clear( | |
1214 | trigger_group->error_counter->counter, | |
1215 | dimension_index); | |
1216 | if (ret) { | |
1217 | printk(KERN_INFO "LTTng: Trigger: Unable to clear error counter bucket %llu\n", | |
1218 | trigger->error_counter_index); | |
1219 | goto register_error; | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | return trigger; | |
1224 | ||
1225 | register_error: | |
1226 | kmem_cache_free(trigger_cache, trigger); | |
1227 | cache_error: | |
1228 | exist: | |
1229 | type_error: | |
1230 | return ERR_PTR(ret); | |
1231 | } | |
1232 | ||
1233 | int lttng_kernel_counter_value(struct lttng_counter *counter, | |
1234 | const size_t *dim_indexes, int64_t *val) | |
1235 | { | |
1236 | int ret; | |
1237 | bool overflow, underflow; | |
1238 | ||
1239 | ret = counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1240 | val, &overflow, &underflow); | |
1241 | if (ret) { | |
1242 | printk(KERN_WARNING "LTTng: Error getting counter value.\n"); | |
1243 | goto error; | |
1244 | } | |
1245 | ||
1246 | if (overflow) | |
1247 | printk(KERN_WARNING "LTTng: counter overflow detected.\n"); | |
1248 | ||
1249 | if (underflow) | |
1250 | printk(KERN_WARNING "LTTng: counter underflow detected.\n"); | |
1251 | ||
1252 | error: | |
1253 | return ret; | |
1254 | } | |
1255 | ||
3c997079 MD |
1256 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1257 | struct lttng_kernel_event *event_param, | |
1258 | void *filter, | |
1259 | const struct lttng_event_desc *event_desc, | |
1260 | enum lttng_kernel_instrumentation itype) | |
1261 | { | |
1262 | struct lttng_event *event; | |
1263 | ||
1264 | mutex_lock(&sessions_mutex); | |
1265 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1266 | itype); | |
1267 | mutex_unlock(&sessions_mutex); | |
1268 | return event; | |
1269 | } | |
1270 | ||
4442bc1b JR |
1271 | struct lttng_trigger *lttng_trigger_create( |
1272 | const struct lttng_event_desc *event_desc, | |
1273 | uint64_t id, uint64_t error_counter_index, | |
1274 | struct lttng_trigger_group *trigger_group, | |
1275 | struct lttng_kernel_trigger *trigger_param, void *filter, | |
1276 | enum lttng_kernel_instrumentation itype) | |
1277 | { | |
1278 | struct lttng_trigger *trigger; | |
1279 | ||
1280 | mutex_lock(&sessions_mutex); | |
1281 | trigger = _lttng_trigger_create(event_desc, id, error_counter_index, | |
1282 | trigger_group, trigger_param, filter, itype); | |
1283 | mutex_unlock(&sessions_mutex); | |
1284 | return trigger; | |
1285 | } | |
1286 | ||
3c997079 MD |
1287 | /* Only used for tracepoints for now. */ |
1288 | static | |
1289 | void register_event(struct lttng_event *event) | |
1290 | { | |
1291 | const struct lttng_event_desc *desc; | |
f127e61e | 1292 | int ret = -EINVAL; |
3c997079 | 1293 | |
3c997079 MD |
1294 | if (event->registered) |
1295 | return; | |
4ecb5ad5 | 1296 | |
3c997079 | 1297 | desc = event->desc; |
4ecb5ad5 MD |
1298 | switch (event->instrumentation) { |
1299 | case LTTNG_KERNEL_TRACEPOINT: | |
1300 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1301 | desc->probe_callback, | |
1302 | event); | |
1303 | break; | |
1304 | case LTTNG_KERNEL_SYSCALL: | |
4442bc1b | 1305 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1306 | break; |
1307 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1308 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1309 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1310 | case LTTNG_KERNEL_NOOP: |
1311 | ret = 0; | |
1312 | break; | |
e884017c | 1313 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1314 | default: |
1315 | WARN_ON_ONCE(1); | |
1316 | } | |
3c997079 MD |
1317 | if (!ret) |
1318 | event->registered = 1; | |
1319 | } | |
1320 | ||
4e3c1b9b MD |
1321 | /* |
1322 | * Only used internally at session destruction. | |
1323 | */ | |
a90917c3 | 1324 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1325 | { |
4ecb5ad5 | 1326 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1327 | int ret = -EINVAL; |
1328 | ||
3c997079 MD |
1329 | if (!event->registered) |
1330 | return 0; | |
1331 | ||
4ecb5ad5 | 1332 | desc = event->desc; |
38d024ae | 1333 | switch (event->instrumentation) { |
ab2277d6 | 1334 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1335 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1336 | event->desc->probe_callback, |
11b5a3c2 | 1337 | event); |
baf20995 | 1338 | break; |
ab2277d6 | 1339 | case LTTNG_KERNEL_KPROBE: |
4442bc1b | 1340 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1341 | ret = 0; |
1342 | break; | |
7371f44c MD |
1343 | case LTTNG_KERNEL_KRETPROBE: |
1344 | lttng_kretprobes_unregister(event); | |
1345 | ret = 0; | |
1346 | break; | |
33a39a3c | 1347 | case LTTNG_KERNEL_SYSCALL: |
4442bc1b | 1348 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1349 | break; |
1350 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1351 | ret = 0; |
1352 | break; | |
149b9a9d | 1353 | case LTTNG_KERNEL_UPROBE: |
4442bc1b | 1354 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1355 | ret = 0; |
1356 | break; | |
e884017c | 1357 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1358 | default: |
1359 | WARN_ON_ONCE(1); | |
1360 | } | |
3c997079 MD |
1361 | if (!ret) |
1362 | event->registered = 0; | |
dda6a249 MD |
1363 | return ret; |
1364 | } | |
1365 | ||
4442bc1b JR |
1366 | /* Only used for tracepoints for now. */ |
1367 | static | |
1368 | void register_trigger(struct lttng_trigger *trigger) | |
1369 | { | |
1370 | const struct lttng_event_desc *desc; | |
1371 | int ret = -EINVAL; | |
1372 | ||
1373 | if (trigger->registered) | |
1374 | return; | |
1375 | ||
1376 | desc = trigger->desc; | |
1377 | switch (trigger->instrumentation) { | |
1378 | case LTTNG_KERNEL_TRACEPOINT: | |
1379 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1380 | desc->trigger_callback, | |
1381 | trigger); | |
1382 | break; | |
1383 | case LTTNG_KERNEL_SYSCALL: | |
1384 | ret = lttng_syscall_filter_enable_trigger(trigger); | |
1385 | break; | |
1386 | case LTTNG_KERNEL_KPROBE: | |
1387 | case LTTNG_KERNEL_UPROBE: | |
1388 | ret = 0; | |
1389 | break; | |
1390 | case LTTNG_KERNEL_KRETPROBE: | |
1391 | case LTTNG_KERNEL_FUNCTION: | |
1392 | case LTTNG_KERNEL_NOOP: | |
1393 | default: | |
1394 | WARN_ON_ONCE(1); | |
1395 | } | |
1396 | if (!ret) | |
1397 | trigger->registered = 1; | |
1398 | } | |
1399 | ||
1400 | static | |
1401 | int _lttng_trigger_unregister(struct lttng_trigger *trigger) | |
1402 | { | |
1403 | const struct lttng_event_desc *desc; | |
1404 | int ret = -EINVAL; | |
1405 | ||
1406 | if (!trigger->registered) | |
1407 | return 0; | |
1408 | ||
1409 | desc = trigger->desc; | |
1410 | switch (trigger->instrumentation) { | |
1411 | case LTTNG_KERNEL_TRACEPOINT: | |
1412 | ret = lttng_wrapper_tracepoint_probe_unregister(trigger->desc->kname, | |
1413 | trigger->desc->trigger_callback, | |
1414 | trigger); | |
1415 | break; | |
1416 | case LTTNG_KERNEL_KPROBE: | |
1417 | lttng_kprobes_unregister_trigger(trigger); | |
1418 | ret = 0; | |
1419 | break; | |
1420 | case LTTNG_KERNEL_UPROBE: | |
1421 | lttng_uprobes_unregister_trigger(trigger); | |
1422 | ret = 0; | |
1423 | break; | |
1424 | case LTTNG_KERNEL_SYSCALL: | |
1425 | ret = lttng_syscall_filter_disable_trigger(trigger); | |
1426 | break; | |
1427 | case LTTNG_KERNEL_KRETPROBE: | |
1428 | case LTTNG_KERNEL_FUNCTION: | |
1429 | case LTTNG_KERNEL_NOOP: | |
1430 | default: | |
1431 | WARN_ON_ONCE(1); | |
1432 | } | |
1433 | if (!ret) | |
1434 | trigger->registered = 0; | |
1435 | return ret; | |
1436 | } | |
1437 | ||
dda6a249 MD |
1438 | /* |
1439 | * Only used internally at session destruction. | |
1440 | */ | |
be066e6c | 1441 | static |
a90917c3 | 1442 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1443 | { |
edeb3137 MD |
1444 | switch (event->instrumentation) { |
1445 | case LTTNG_KERNEL_TRACEPOINT: | |
4442bc1b | 1446 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1447 | break; |
1448 | case LTTNG_KERNEL_KPROBE: | |
1449 | module_put(event->desc->owner); | |
4442bc1b | 1450 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1451 | break; |
7371f44c MD |
1452 | case LTTNG_KERNEL_KRETPROBE: |
1453 | module_put(event->desc->owner); | |
1454 | lttng_kretprobes_destroy_private(event); | |
1455 | break; | |
259b6cb3 | 1456 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1457 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1458 | break; |
149b9a9d YB |
1459 | case LTTNG_KERNEL_UPROBE: |
1460 | module_put(event->desc->owner); | |
4442bc1b | 1461 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1462 | break; |
e884017c | 1463 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1464 | default: |
1465 | WARN_ON_ONCE(1); | |
1466 | } | |
dda6a249 | 1467 | list_del(&event->list); |
8070f5c0 | 1468 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1469 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1470 | } |
1471 | ||
4442bc1b JR |
1472 | /* |
1473 | * Only used internally at session destruction. | |
1474 | */ | |
1475 | static | |
1476 | void _lttng_trigger_destroy(struct lttng_trigger *trigger) | |
1477 | { | |
1478 | switch (trigger->instrumentation) { | |
1479 | case LTTNG_KERNEL_TRACEPOINT: | |
1480 | lttng_event_desc_put(trigger->desc); | |
1481 | break; | |
1482 | case LTTNG_KERNEL_KPROBE: | |
1483 | module_put(trigger->desc->owner); | |
1484 | lttng_kprobes_destroy_trigger_private(trigger); | |
1485 | break; | |
1486 | case LTTNG_KERNEL_NOOP: | |
1487 | case LTTNG_KERNEL_SYSCALL: | |
1488 | break; | |
1489 | case LTTNG_KERNEL_UPROBE: | |
1490 | module_put(trigger->desc->owner); | |
1491 | lttng_uprobes_destroy_trigger_private(trigger); | |
1492 | break; | |
1493 | case LTTNG_KERNEL_KRETPROBE: | |
1494 | case LTTNG_KERNEL_FUNCTION: | |
1495 | default: | |
1496 | WARN_ON_ONCE(1); | |
1497 | } | |
1498 | list_del(&trigger->list); | |
1499 | kmem_cache_free(trigger_cache, trigger); | |
1500 | } | |
1501 | ||
d1f652f8 MD |
1502 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1503 | enum tracker_type tracker_type) | |
e0130fab | 1504 | { |
d1f652f8 MD |
1505 | switch (tracker_type) { |
1506 | case TRACKER_PID: | |
1507 | return &session->pid_tracker; | |
1508 | case TRACKER_VPID: | |
1509 | return &session->vpid_tracker; | |
1510 | case TRACKER_UID: | |
1511 | return &session->uid_tracker; | |
1512 | case TRACKER_VUID: | |
1513 | return &session->vuid_tracker; | |
1514 | case TRACKER_GID: | |
1515 | return &session->gid_tracker; | |
1516 | case TRACKER_VGID: | |
1517 | return &session->vgid_tracker; | |
1518 | default: | |
1519 | WARN_ON_ONCE(1); | |
1520 | return NULL; | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | int lttng_session_track_id(struct lttng_session *session, | |
1525 | enum tracker_type tracker_type, int id) | |
1526 | { | |
1527 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1528 | int ret; |
1529 | ||
d1f652f8 MD |
1530 | tracker = get_tracker(session, tracker_type); |
1531 | if (!tracker) | |
1532 | return -EINVAL; | |
1533 | if (id < -1) | |
e0130fab MD |
1534 | return -EINVAL; |
1535 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1536 | if (id == -1) { |
1537 | /* track all ids: destroy tracker. */ | |
1538 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1539 | ret = 0; |
1540 | } else { | |
d1f652f8 | 1541 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1542 | } |
e0130fab MD |
1543 | mutex_unlock(&sessions_mutex); |
1544 | return ret; | |
1545 | } | |
1546 | ||
d1f652f8 MD |
1547 | int lttng_session_untrack_id(struct lttng_session *session, |
1548 | enum tracker_type tracker_type, int id) | |
e0130fab | 1549 | { |
d1f652f8 | 1550 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1551 | int ret; |
1552 | ||
d1f652f8 MD |
1553 | tracker = get_tracker(session, tracker_type); |
1554 | if (!tracker) | |
1555 | return -EINVAL; | |
1556 | if (id < -1) | |
e0130fab MD |
1557 | return -EINVAL; |
1558 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1559 | if (id == -1) { |
1560 | /* untrack all ids: replace by empty tracker. */ | |
1561 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1562 | } else { |
d1f652f8 | 1563 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1564 | } |
e0130fab MD |
1565 | mutex_unlock(&sessions_mutex); |
1566 | return ret; | |
1567 | } | |
1568 | ||
7e6f9ef6 | 1569 | static |
d1f652f8 | 1570 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1571 | { |
d1f652f8 MD |
1572 | struct lttng_id_tracker *id_tracker = m->private; |
1573 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1574 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1575 | int iter = 0, i; |
1576 | ||
1577 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1578 | if (id_tracker_p) { |
1579 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1580 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1581 | |
f934e302 | 1582 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1583 | if (iter++ >= *pos) |
1584 | return e; | |
1585 | } | |
1586 | } | |
1587 | } else { | |
d1f652f8 | 1588 | /* ID tracker disabled. */ |
7e6f9ef6 | 1589 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1590 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1591 | } |
1592 | iter++; | |
1593 | } | |
1594 | /* End of list */ | |
1595 | return NULL; | |
1596 | } | |
1597 | ||
1598 | /* Called with sessions_mutex held. */ | |
1599 | static | |
d1f652f8 | 1600 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1601 | { |
d1f652f8 MD |
1602 | struct lttng_id_tracker *id_tracker = m->private; |
1603 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1604 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1605 | int iter = 0, i; |
1606 | ||
1607 | (*ppos)++; | |
d1f652f8 MD |
1608 | if (id_tracker_p) { |
1609 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1610 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1611 | |
f934e302 | 1612 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1613 | if (iter++ >= *ppos) |
1614 | return e; | |
1615 | } | |
1616 | } | |
1617 | } else { | |
d1f652f8 | 1618 | /* ID tracker disabled. */ |
7e6f9ef6 | 1619 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1620 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1621 | iter++; |
1622 | } | |
1623 | ||
1624 | /* End of list */ | |
1625 | return NULL; | |
1626 | } | |
1627 | ||
1628 | static | |
d1f652f8 | 1629 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1630 | { |
1631 | mutex_unlock(&sessions_mutex); | |
1632 | } | |
1633 | ||
1634 | static | |
d1f652f8 | 1635 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1636 | { |
d1f652f8 MD |
1637 | struct lttng_id_tracker *id_tracker = m->private; |
1638 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1639 | int id; | |
7e6f9ef6 | 1640 | |
d1f652f8 | 1641 | if (p == id_tracker_p) { |
7e6f9ef6 | 1642 | /* Tracker disabled. */ |
d1f652f8 | 1643 | id = -1; |
7e6f9ef6 | 1644 | } else { |
d1f652f8 | 1645 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1646 | |
d1f652f8 MD |
1647 | id = lttng_id_tracker_get_node_id(e); |
1648 | } | |
1649 | switch (id_tracker->tracker_type) { | |
1650 | case TRACKER_PID: | |
1651 | seq_printf(m, "process { pid = %d; };\n", id); | |
1652 | break; | |
1653 | case TRACKER_VPID: | |
1654 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1655 | break; | |
1656 | case TRACKER_UID: | |
1657 | seq_printf(m, "user { uid = %d; };\n", id); | |
1658 | break; | |
1659 | case TRACKER_VUID: | |
1660 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1661 | break; | |
1662 | case TRACKER_GID: | |
1663 | seq_printf(m, "group { gid = %d; };\n", id); | |
1664 | break; | |
1665 | case TRACKER_VGID: | |
1666 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1667 | break; | |
1668 | default: | |
1669 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1670 | } |
7e6f9ef6 MD |
1671 | return 0; |
1672 | } | |
1673 | ||
1674 | static | |
d1f652f8 MD |
1675 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1676 | .start = id_list_start, | |
1677 | .next = id_list_next, | |
1678 | .stop = id_list_stop, | |
1679 | .show = id_list_show, | |
7e6f9ef6 MD |
1680 | }; |
1681 | ||
1682 | static | |
d1f652f8 | 1683 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1684 | { |
d1f652f8 | 1685 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1686 | } |
1687 | ||
1688 | static | |
d1f652f8 | 1689 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1690 | { |
1691 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1692 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1693 | int ret; |
1694 | ||
d1f652f8 | 1695 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1696 | ret = seq_release(inode, file); |
d1f652f8 MD |
1697 | if (!ret) |
1698 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1699 | return ret; |
1700 | } | |
1701 | ||
d1f652f8 | 1702 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1703 | .owner = THIS_MODULE, |
d1f652f8 | 1704 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1705 | .read = seq_read, |
1706 | .llseek = seq_lseek, | |
d1f652f8 | 1707 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1708 | }; |
1709 | ||
d1f652f8 MD |
1710 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1711 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1712 | { |
d1f652f8 | 1713 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1714 | struct seq_file *m; |
1715 | int file_fd, ret; | |
1716 | ||
1717 | file_fd = lttng_get_unused_fd(); | |
1718 | if (file_fd < 0) { | |
1719 | ret = file_fd; | |
1720 | goto fd_error; | |
1721 | } | |
1722 | ||
d1f652f8 MD |
1723 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1724 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1725 | NULL, O_RDWR); |
d1f652f8 MD |
1726 | if (IS_ERR(tracker_ids_list_file)) { |
1727 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1728 | goto file_error; |
1729 | } | |
98d7281c MJ |
1730 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1731 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1732 | goto refcount_error; |
1733 | } | |
d1f652f8 | 1734 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1735 | if (ret < 0) |
1736 | goto open_error; | |
d1f652f8 MD |
1737 | m = tracker_ids_list_file->private_data; |
1738 | ||
1739 | m->private = get_tracker(session, tracker_type); | |
1740 | BUG_ON(!m->private); | |
1741 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1742 | |
1743 | return file_fd; | |
1744 | ||
1745 | open_error: | |
9c1f4643 MD |
1746 | atomic_long_dec(&session->file->f_count); |
1747 | refcount_error: | |
d1f652f8 | 1748 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1749 | file_error: |
1750 | put_unused_fd(file_fd); | |
1751 | fd_error: | |
1752 | return ret; | |
1753 | } | |
1754 | ||
3c997079 MD |
1755 | /* |
1756 | * Enabler management. | |
1757 | */ | |
1758 | static | |
4993071a PP |
1759 | int lttng_match_enabler_star_glob(const char *desc_name, |
1760 | const char *pattern) | |
3c997079 | 1761 | { |
cbc19040 MD |
1762 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1763 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1764 | return 0; |
1765 | return 1; | |
1766 | } | |
1767 | ||
1768 | static | |
4ecb5ad5 MD |
1769 | int lttng_match_enabler_name(const char *desc_name, |
1770 | const char *name) | |
3c997079 | 1771 | { |
4ecb5ad5 | 1772 | if (strcmp(desc_name, name)) |
3c997079 MD |
1773 | return 0; |
1774 | return 1; | |
1775 | } | |
1776 | ||
3c997079 MD |
1777 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1778 | struct lttng_enabler *enabler) | |
1779 | { | |
4ecb5ad5 | 1780 | const char *desc_name, *enabler_name; |
badfe9f5 | 1781 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1782 | |
1783 | enabler_name = enabler->event_param.name; | |
1784 | switch (enabler->event_param.instrumentation) { | |
1785 | case LTTNG_KERNEL_TRACEPOINT: | |
1786 | desc_name = desc->name; | |
4442bc1b JR |
1787 | switch (enabler->format_type) { |
1788 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1789 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
4442bc1b | 1790 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1791 | return lttng_match_enabler_name(desc_name, enabler_name); |
1792 | default: | |
1793 | return -EINVAL; | |
1794 | } | |
4ecb5ad5 MD |
1795 | break; |
1796 | case LTTNG_KERNEL_SYSCALL: | |
1797 | desc_name = desc->name; | |
badfe9f5 | 1798 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1799 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1800 | compat = true; |
1801 | } | |
4ecb5ad5 MD |
1802 | if (!strncmp(desc_name, "syscall_exit_", |
1803 | strlen("syscall_exit_"))) { | |
1804 | desc_name += strlen("syscall_exit_"); | |
1805 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1806 | strlen("syscall_entry_"))) { | |
1807 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1808 | entry = true; |
4ecb5ad5 MD |
1809 | } else { |
1810 | WARN_ON_ONCE(1); | |
1811 | return -EINVAL; | |
1812 | } | |
badfe9f5 MD |
1813 | switch (enabler->event_param.u.syscall.entryexit) { |
1814 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1815 | break; | |
1816 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1817 | if (!entry) | |
1818 | return 0; | |
1819 | break; | |
1820 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1821 | if (entry) | |
1822 | return 0; | |
1823 | break; | |
1824 | default: | |
1825 | return -EINVAL; | |
1826 | } | |
1827 | switch (enabler->event_param.u.syscall.abi) { | |
1828 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1829 | break; | |
1830 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1831 | if (compat) | |
1832 | return 0; | |
1833 | break; | |
1834 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1835 | if (!compat) | |
1836 | return 0; | |
1837 | break; | |
1838 | default: | |
1839 | return -EINVAL; | |
1840 | } | |
1841 | switch (enabler->event_param.u.syscall.match) { | |
1842 | case LTTNG_SYSCALL_MATCH_NAME: | |
4442bc1b JR |
1843 | switch (enabler->format_type) { |
1844 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1845 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
4442bc1b | 1846 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1847 | return lttng_match_enabler_name(desc_name, enabler_name); |
1848 | default: | |
1849 | return -EINVAL; | |
1850 | } | |
1851 | break; | |
1852 | case LTTNG_SYSCALL_MATCH_NR: | |
1853 | return -EINVAL; /* Not implemented. */ | |
1854 | default: | |
1855 | return -EINVAL; | |
1856 | } | |
4ecb5ad5 MD |
1857 | break; |
1858 | default: | |
1859 | WARN_ON_ONCE(1); | |
1860 | return -EINVAL; | |
1861 | } | |
3c997079 MD |
1862 | } |
1863 | ||
1864 | static | |
4442bc1b JR |
1865 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1866 | struct lttng_event *event) | |
3c997079 | 1867 | { |
4442bc1b JR |
1868 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1869 | event_enabler); | |
1870 | ||
1871 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1872 | return 0; |
4442bc1b JR |
1873 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1874 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1875 | return 1; |
1876 | else | |
1877 | return 0; | |
1878 | } | |
1879 | ||
1880 | static | |
4442bc1b JR |
1881 | int lttng_trigger_enabler_match_trigger(struct lttng_trigger_enabler *trigger_enabler, |
1882 | struct lttng_trigger *trigger) | |
1883 | { | |
1884 | struct lttng_enabler *base_enabler = lttng_trigger_enabler_as_enabler( | |
1885 | trigger_enabler); | |
1886 | ||
1887 | if (base_enabler->event_param.instrumentation != trigger->instrumentation) | |
1888 | return 0; | |
1889 | if (lttng_desc_match_enabler(trigger->desc, base_enabler) | |
1890 | && trigger->group == trigger_enabler->group | |
1891 | && trigger->id == trigger_enabler->id) | |
1892 | return 1; | |
1893 | else | |
1894 | return 0; | |
1895 | } | |
1896 | ||
1897 | static | |
1898 | struct lttng_enabler_ref *lttng_enabler_ref( | |
1899 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1900 | struct lttng_enabler *enabler) |
1901 | { | |
1902 | struct lttng_enabler_ref *enabler_ref; | |
1903 | ||
4442bc1b | 1904 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1905 | if (enabler_ref->ref == enabler) |
1906 | return enabler_ref; | |
1907 | } | |
1908 | return NULL; | |
1909 | } | |
1910 | ||
3c997079 | 1911 | static |
4442bc1b | 1912 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1913 | { |
4442bc1b | 1914 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1915 | struct lttng_probe_desc *probe_desc; |
1916 | const struct lttng_event_desc *desc; | |
1917 | int i; | |
1918 | struct list_head *probe_list; | |
1919 | ||
1920 | probe_list = lttng_get_probe_list_head(); | |
1921 | /* | |
1922 | * For each probe event, if we find that a probe event matches | |
1923 | * our enabler, create an associated lttng_event if not | |
1924 | * already present. | |
1925 | */ | |
1926 | list_for_each_entry(probe_desc, probe_list, head) { | |
1927 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1928 | int found = 0; | |
1929 | struct hlist_head *head; | |
3c997079 MD |
1930 | struct lttng_event *event; |
1931 | ||
1932 | desc = probe_desc->event_desc[i]; | |
4442bc1b JR |
1933 | if (!lttng_desc_match_enabler(desc, |
1934 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1935 | continue; |
3c997079 MD |
1936 | |
1937 | /* | |
1938 | * Check if already created. | |
1939 | */ | |
4442bc1b JR |
1940 | head = utils_borrow_hash_table_bucket( |
1941 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1942 | desc->name); | |
d216ecae | 1943 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1944 | if (event->desc == desc |
4442bc1b JR |
1945 | && event->chan == event_enabler->chan) |
1946 | found = 1; | |
1947 | } | |
1948 | if (found) | |
1949 | continue; | |
1950 | ||
1951 | /* | |
1952 | * We need to create an event for this | |
1953 | * event probe. | |
1954 | */ | |
1955 | event = _lttng_event_create(event_enabler->chan, | |
1956 | NULL, NULL, desc, | |
1957 | LTTNG_KERNEL_TRACEPOINT); | |
1958 | if (!event) { | |
1959 | printk(KERN_INFO "LTTng: Unable to create event %s\n", | |
1960 | probe_desc->event_desc[i]->name); | |
1961 | } | |
1962 | } | |
1963 | } | |
1964 | } | |
1965 | ||
1966 | static | |
1967 | void lttng_create_tracepoint_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
1968 | { | |
1969 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1970 | struct lttng_probe_desc *probe_desc; | |
1971 | const struct lttng_event_desc *desc; | |
1972 | int i; | |
1973 | struct list_head *probe_list; | |
1974 | ||
1975 | probe_list = lttng_get_probe_list_head(); | |
1976 | /* | |
1977 | * For each probe event, if we find that a probe event matches | |
1978 | * our enabler, create an associated lttng_trigger if not | |
1979 | * already present. | |
1980 | */ | |
1981 | list_for_each_entry(probe_desc, probe_list, head) { | |
1982 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1983 | int found = 0; | |
1984 | struct hlist_head *head; | |
1985 | struct lttng_trigger *trigger; | |
1986 | ||
1987 | desc = probe_desc->event_desc[i]; | |
1988 | if (!lttng_desc_match_enabler(desc, | |
1989 | lttng_trigger_enabler_as_enabler(trigger_enabler))) | |
1990 | continue; | |
1991 | ||
1992 | /* | |
1993 | * Check if already created. | |
1994 | */ | |
1995 | head = utils_borrow_hash_table_bucket( | |
1996 | trigger_group->triggers_ht.table, | |
1997 | LTTNG_TRIGGER_HT_SIZE, desc->name); | |
1998 | lttng_hlist_for_each_entry(trigger, head, hlist) { | |
1999 | if (trigger->desc == desc | |
2000 | && trigger->id == trigger_enabler->id) | |
3c997079 MD |
2001 | found = 1; |
2002 | } | |
2003 | if (found) | |
2004 | continue; | |
2005 | ||
2006 | /* | |
4442bc1b | 2007 | * We need to create a trigger for this event probe. |
3c997079 | 2008 | */ |
4442bc1b JR |
2009 | trigger = _lttng_trigger_create(desc, |
2010 | trigger_enabler->id, | |
2011 | trigger_enabler->error_counter_index, | |
2012 | trigger_group, NULL, NULL, | |
2013 | LTTNG_KERNEL_TRACEPOINT); | |
2014 | if (IS_ERR(trigger)) { | |
2015 | printk(KERN_INFO "Unable to create trigger %s\n", | |
3c997079 MD |
2016 | probe_desc->event_desc[i]->name); |
2017 | } | |
2018 | } | |
2019 | } | |
2020 | } | |
2021 | ||
33a39a3c | 2022 | static |
4442bc1b JR |
2023 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
2024 | { | |
2025 | int ret; | |
2026 | ||
2027 | ret = lttng_syscalls_register_event(event_enabler->chan, NULL); | |
2028 | WARN_ON_ONCE(ret); | |
2029 | } | |
2030 | ||
2031 | static | |
2032 | void lttng_create_syscall_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
33a39a3c MD |
2033 | { |
2034 | int ret; | |
2035 | ||
4442bc1b JR |
2036 | ret = lttng_syscalls_register_trigger(trigger_enabler, NULL); |
2037 | WARN_ON_ONCE(ret); | |
2038 | ret = lttng_syscals_create_matching_triggers(trigger_enabler, NULL); | |
33a39a3c MD |
2039 | WARN_ON_ONCE(ret); |
2040 | } | |
2041 | ||
2042 | /* | |
2043 | * Create struct lttng_event if it is missing and present in the list of | |
2044 | * tracepoint probes. | |
2045 | * Should be called with sessions mutex held. | |
2046 | */ | |
2047 | static | |
4442bc1b | 2048 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2049 | { |
4442bc1b | 2050 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2051 | case LTTNG_KERNEL_TRACEPOINT: |
4442bc1b | 2052 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
2053 | break; |
2054 | case LTTNG_KERNEL_SYSCALL: | |
4442bc1b | 2055 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
2056 | break; |
2057 | default: | |
2058 | WARN_ON_ONCE(1); | |
2059 | break; | |
2060 | } | |
2061 | } | |
2062 | ||
3c997079 | 2063 | /* |
4442bc1b | 2064 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2065 | * and add backward reference from the event to the enabler. |
2066 | * Should be called with sessions mutex held. | |
2067 | */ | |
2068 | static | |
4442bc1b | 2069 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2070 | { |
4442bc1b JR |
2071 | struct lttng_channel *chan = event_enabler->chan; |
2072 | struct lttng_session *session = event_enabler->chan->session; | |
2073 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2074 | struct lttng_event *event; |
2075 | ||
4442bc1b JR |
2076 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2077 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
2078 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2079 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
2080 | !strcmp(base_enabler->event_param.name, "*")) { | |
2081 | if (base_enabler->enabled) | |
badfe9f5 MD |
2082 | WRITE_ONCE(chan->syscall_all, 1); |
2083 | else | |
2084 | WRITE_ONCE(chan->syscall_all, 0); | |
2085 | } | |
2086 | ||
3c997079 | 2087 | /* First ensure that probe events are created for this enabler. */ |
4442bc1b | 2088 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2089 | |
4442bc1b | 2090 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2091 | list_for_each_entry(event, &session->events, list) { |
2092 | struct lttng_enabler_ref *enabler_ref; | |
2093 | ||
4442bc1b | 2094 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2095 | continue; |
4442bc1b JR |
2096 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2097 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2098 | if (!enabler_ref) { |
2099 | /* | |
2100 | * If no backward ref, create it. | |
4442bc1b | 2101 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2102 | */ |
2103 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2104 | if (!enabler_ref) | |
2105 | return -ENOMEM; | |
4442bc1b | 2106 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2107 | list_add(&enabler_ref->node, |
2108 | &event->enablers_ref_head); | |
2109 | } | |
2110 | ||
f127e61e MD |
2111 | /* |
2112 | * Link filter bytecodes if not linked yet. | |
2113 | */ | |
4442bc1b JR |
2114 | lttng_enabler_link_bytecode(event->desc, |
2115 | lttng_static_ctx, | |
2116 | &event->filter_bytecode_runtime_head, | |
2117 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); | |
f127e61e | 2118 | |
3c997079 MD |
2119 | /* TODO: merge event context. */ |
2120 | } | |
2121 | return 0; | |
2122 | } | |
2123 | ||
4442bc1b JR |
2124 | /* |
2125 | * Create struct lttng_trigger if it is missing and present in the list of | |
2126 | * tracepoint probes. | |
2127 | * Should be called with sessions mutex held. | |
2128 | */ | |
2129 | static | |
2130 | void lttng_create_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
2131 | { | |
2132 | switch (trigger_enabler->base.event_param.instrumentation) { | |
2133 | case LTTNG_KERNEL_TRACEPOINT: | |
2134 | lttng_create_tracepoint_trigger_if_missing(trigger_enabler); | |
2135 | break; | |
2136 | case LTTNG_KERNEL_SYSCALL: | |
2137 | lttng_create_syscall_trigger_if_missing(trigger_enabler); | |
2138 | break; | |
2139 | default: | |
2140 | WARN_ON_ONCE(1); | |
2141 | break; | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Create triggers associated with a trigger enabler (if not already present). | |
2147 | */ | |
2148 | static | |
2149 | int lttng_trigger_enabler_ref_triggers(struct lttng_trigger_enabler *trigger_enabler) | |
2150 | { | |
2151 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
2152 | struct lttng_trigger *trigger; | |
2153 | ||
2154 | /* First ensure that probe triggers are created for this enabler. */ | |
2155 | lttng_create_trigger_if_missing(trigger_enabler); | |
2156 | ||
2157 | /* Link the created trigger with its associated enabler. */ | |
2158 | list_for_each_entry(trigger, &trigger_group->triggers_head, list) { | |
2159 | struct lttng_enabler_ref *enabler_ref; | |
2160 | ||
2161 | if (!lttng_trigger_enabler_match_trigger(trigger_enabler, trigger)) | |
2162 | continue; | |
2163 | ||
2164 | enabler_ref = lttng_enabler_ref(&trigger->enablers_ref_head, | |
2165 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
2166 | if (!enabler_ref) { | |
2167 | /* | |
2168 | * If no backward ref, create it. | |
2169 | * Add backward ref from trigger to enabler. | |
2170 | */ | |
2171 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2172 | if (!enabler_ref) | |
2173 | return -ENOMEM; | |
2174 | ||
2175 | enabler_ref->ref = lttng_trigger_enabler_as_enabler( | |
2176 | trigger_enabler); | |
2177 | list_add(&enabler_ref->node, | |
2178 | &trigger->enablers_ref_head); | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Link filter bytecodes if not linked yet. | |
2183 | */ | |
2184 | lttng_enabler_link_bytecode(trigger->desc, | |
2185 | lttng_static_ctx, &trigger->filter_bytecode_runtime_head, | |
2186 | <tng_trigger_enabler_as_enabler(trigger_enabler)->filter_bytecode_head); | |
2187 | ||
2188 | /* Link capture bytecodes if not linked yet. */ | |
2189 | lttng_enabler_link_bytecode(trigger->desc, | |
2190 | lttng_static_ctx, &trigger->capture_bytecode_runtime_head, | |
2191 | &trigger_enabler->capture_bytecode_head); | |
2192 | ||
2193 | trigger->num_captures = trigger_enabler->num_captures; | |
2194 | } | |
2195 | return 0; | |
2196 | } | |
2197 | ||
3c997079 MD |
2198 | /* |
2199 | * Called at module load: connect the probe on all enablers matching | |
2200 | * this event. | |
2201 | * Called with sessions lock held. | |
2202 | */ | |
2203 | int lttng_fix_pending_events(void) | |
2204 | { | |
2205 | struct lttng_session *session; | |
2206 | ||
2207 | list_for_each_entry(session, &sessions, list) | |
4442bc1b JR |
2208 | lttng_session_lazy_sync_event_enablers(session); |
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | static bool lttng_trigger_group_has_active_triggers( | |
2213 | struct lttng_trigger_group *trigger_group) | |
2214 | { | |
2215 | struct lttng_trigger_enabler *trigger_enabler; | |
2216 | ||
2217 | list_for_each_entry(trigger_enabler, &trigger_group->enablers_head, | |
2218 | node) { | |
2219 | if (trigger_enabler->base.enabled) | |
2220 | return true; | |
2221 | } | |
2222 | return false; | |
2223 | } | |
2224 | ||
2225 | bool lttng_trigger_active(void) | |
2226 | { | |
2227 | struct lttng_trigger_group *trigger_group; | |
2228 | ||
2229 | list_for_each_entry(trigger_group, &trigger_groups, node) { | |
2230 | if (lttng_trigger_group_has_active_triggers(trigger_group)) | |
2231 | return true; | |
2232 | } | |
2233 | return false; | |
2234 | } | |
2235 | ||
2236 | int lttng_fix_pending_triggers(void) | |
2237 | { | |
2238 | struct lttng_trigger_group *trigger_group; | |
2239 | ||
2240 | list_for_each_entry(trigger_group, &trigger_groups, node) | |
2241 | lttng_trigger_group_sync_enablers(trigger_group); | |
3c997079 MD |
2242 | return 0; |
2243 | } | |
2244 | ||
4442bc1b JR |
2245 | struct lttng_event_enabler *lttng_event_enabler_create( |
2246 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2247 | struct lttng_kernel_event *event_param, |
2248 | struct lttng_channel *chan) | |
2249 | { | |
4442bc1b | 2250 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2251 | |
4442bc1b JR |
2252 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2253 | if (!event_enabler) | |
3c997079 | 2254 | return NULL; |
4442bc1b JR |
2255 | event_enabler->base.format_type = format_type; |
2256 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2257 | memcpy(&event_enabler->base.event_param, event_param, | |
2258 | sizeof(event_enabler->base.event_param)); | |
2259 | event_enabler->chan = chan; | |
3c997079 | 2260 | /* ctx left NULL */ |
4442bc1b JR |
2261 | event_enabler->base.enabled = 0; |
2262 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2263 | mutex_lock(&sessions_mutex); |
4442bc1b JR |
2264 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2265 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2266 | mutex_unlock(&sessions_mutex); |
4442bc1b | 2267 | return event_enabler; |
3c997079 MD |
2268 | } |
2269 | ||
4442bc1b | 2270 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2271 | { |
2272 | mutex_lock(&sessions_mutex); | |
4442bc1b JR |
2273 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2274 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2275 | mutex_unlock(&sessions_mutex); |
2276 | return 0; | |
2277 | } | |
2278 | ||
4442bc1b | 2279 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2280 | { |
2281 | mutex_lock(&sessions_mutex); | |
4442bc1b JR |
2282 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2283 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2284 | mutex_unlock(&sessions_mutex); |
2285 | return 0; | |
2286 | } | |
2287 | ||
4442bc1b JR |
2288 | static |
2289 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, | |
07dfc1d0 MD |
2290 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2291 | { | |
4442bc1b | 2292 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2293 | uint32_t bytecode_len; |
2294 | int ret; | |
2295 | ||
2296 | ret = get_user(bytecode_len, &bytecode->len); | |
2297 | if (ret) | |
2298 | return ret; | |
2299 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2300 | GFP_KERNEL); | |
2301 | if (!bytecode_node) | |
2302 | return -ENOMEM; | |
2303 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2304 | sizeof(*bytecode) + bytecode_len); | |
2305 | if (ret) | |
2306 | goto error_free; | |
4442bc1b JR |
2307 | |
2308 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; | |
07dfc1d0 MD |
2309 | bytecode_node->enabler = enabler; |
2310 | /* Enforce length based on allocated size */ | |
2311 | bytecode_node->bc.len = bytecode_len; | |
2312 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
4442bc1b | 2313 | |
07dfc1d0 MD |
2314 | return 0; |
2315 | ||
2316 | error_free: | |
2317 | kfree(bytecode_node); | |
2318 | return ret; | |
2319 | } | |
2320 | ||
4442bc1b JR |
2321 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
2322 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2323 | { | |
2324 | int ret; | |
2325 | ret = lttng_enabler_attach_filter_bytecode( | |
2326 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
2327 | if (ret) | |
2328 | goto error; | |
2329 | ||
2330 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2331 | return 0; | |
2332 | ||
2333 | error: | |
2334 | return ret; | |
2335 | } | |
2336 | ||
3aed4dca FD |
2337 | int lttng_event_add_callsite(struct lttng_event *event, |
2338 | struct lttng_kernel_event_callsite __user *callsite) | |
2339 | { | |
2340 | ||
2341 | switch (event->instrumentation) { | |
2342 | case LTTNG_KERNEL_UPROBE: | |
4442bc1b | 2343 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2344 | default: |
2345 | return -EINVAL; | |
2346 | } | |
2347 | } | |
2348 | ||
4442bc1b | 2349 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2350 | struct lttng_kernel_context *context_param) |
2351 | { | |
2352 | return -ENOSYS; | |
2353 | } | |
2354 | ||
2355 | static | |
2356 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2357 | { | |
4442bc1b | 2358 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2359 | |
2360 | /* Destroy filter bytecode */ | |
2361 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2362 | &enabler->filter_bytecode_head, node) { | |
2363 | kfree(filter_node); | |
2364 | } | |
4442bc1b JR |
2365 | } |
2366 | ||
2367 | static | |
2368 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2369 | { | |
2370 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2371 | |
3c997079 | 2372 | /* Destroy contexts */ |
4442bc1b JR |
2373 | lttng_destroy_context(event_enabler->ctx); |
2374 | ||
2375 | list_del(&event_enabler->node); | |
2376 | kfree(event_enabler); | |
2377 | } | |
2378 | ||
2379 | struct lttng_trigger_enabler *lttng_trigger_enabler_create( | |
2380 | struct lttng_trigger_group *trigger_group, | |
2381 | enum lttng_enabler_format_type format_type, | |
2382 | struct lttng_kernel_trigger *trigger_param) | |
2383 | { | |
2384 | struct lttng_trigger_enabler *trigger_enabler; | |
2385 | ||
2386 | trigger_enabler = kzalloc(sizeof(*trigger_enabler), GFP_KERNEL); | |
2387 | if (!trigger_enabler) | |
2388 | return NULL; | |
2389 | ||
2390 | trigger_enabler->base.format_type = format_type; | |
2391 | INIT_LIST_HEAD(&trigger_enabler->base.filter_bytecode_head); | |
2392 | INIT_LIST_HEAD(&trigger_enabler->capture_bytecode_head); | |
2393 | ||
2394 | trigger_enabler->id = trigger_param->id; | |
2395 | trigger_enabler->error_counter_index = trigger_param->error_counter_index; | |
2396 | trigger_enabler->num_captures = 0; | |
2397 | ||
2398 | memcpy(&trigger_enabler->base.event_param.name, trigger_param->name, | |
2399 | sizeof(trigger_enabler->base.event_param.name)); | |
2400 | trigger_enabler->base.event_param.instrumentation = trigger_param->instrumentation; | |
2401 | trigger_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
2402 | ||
2403 | trigger_enabler->base.enabled = 0; | |
2404 | trigger_enabler->group = trigger_group; | |
2405 | ||
2406 | mutex_lock(&sessions_mutex); | |
2407 | list_add(&trigger_enabler->node, &trigger_enabler->group->enablers_head); | |
2408 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
2409 | ||
2410 | mutex_unlock(&sessions_mutex); | |
2411 | ||
2412 | return trigger_enabler; | |
2413 | } | |
2414 | ||
2415 | int lttng_trigger_enabler_enable(struct lttng_trigger_enabler *trigger_enabler) | |
2416 | { | |
2417 | mutex_lock(&sessions_mutex); | |
2418 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 1; | |
2419 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
2420 | mutex_unlock(&sessions_mutex); | |
2421 | return 0; | |
2422 | } | |
2423 | ||
2424 | int lttng_trigger_enabler_disable(struct lttng_trigger_enabler *trigger_enabler) | |
2425 | { | |
2426 | mutex_lock(&sessions_mutex); | |
2427 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 0; | |
2428 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
2429 | mutex_unlock(&sessions_mutex); | |
2430 | return 0; | |
2431 | } | |
2432 | ||
2433 | int lttng_trigger_enabler_attach_filter_bytecode( | |
2434 | struct lttng_trigger_enabler *trigger_enabler, | |
2435 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2436 | { | |
2437 | int ret; | |
2438 | ||
2439 | ret = lttng_enabler_attach_filter_bytecode( | |
2440 | lttng_trigger_enabler_as_enabler(trigger_enabler), bytecode); | |
2441 | if (ret) | |
2442 | goto error; | |
2443 | ||
2444 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
2445 | return 0; | |
2446 | ||
2447 | error: | |
2448 | return ret; | |
2449 | } | |
2450 | ||
2451 | int lttng_trigger_enabler_attach_capture_bytecode( | |
2452 | struct lttng_trigger_enabler *trigger_enabler, | |
2453 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2454 | { | |
2455 | struct lttng_bytecode_node *bytecode_node; | |
2456 | struct lttng_enabler *enabler = | |
2457 | lttng_trigger_enabler_as_enabler(trigger_enabler); | |
2458 | uint32_t bytecode_len; | |
2459 | int ret; | |
2460 | ||
2461 | ret = get_user(bytecode_len, &bytecode->len); | |
2462 | if (ret) | |
2463 | return ret; | |
2464 | ||
2465 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2466 | GFP_KERNEL); | |
2467 | if (!bytecode_node) | |
2468 | return -ENOMEM; | |
2469 | ||
2470 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2471 | sizeof(*bytecode) + bytecode_len); | |
2472 | if (ret) | |
2473 | goto error_free; | |
2474 | ||
2475 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2476 | bytecode_node->enabler = enabler; | |
2477 | ||
2478 | /* Enforce length based on allocated size */ | |
2479 | bytecode_node->bc.len = bytecode_len; | |
2480 | list_add_tail(&bytecode_node->node, &trigger_enabler->capture_bytecode_head); | |
2481 | ||
2482 | trigger_enabler->num_captures++; | |
2483 | ||
2484 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
2485 | goto end; | |
2486 | ||
2487 | error_free: | |
2488 | kfree(bytecode_node); | |
2489 | end: | |
2490 | return ret; | |
2491 | } | |
2492 | ||
2493 | int lttng_trigger_add_callsite(struct lttng_trigger *trigger, | |
2494 | struct lttng_kernel_event_callsite __user *callsite) | |
2495 | { | |
2496 | ||
2497 | switch (trigger->instrumentation) { | |
2498 | case LTTNG_KERNEL_UPROBE: | |
2499 | return lttng_uprobes_trigger_add_callsite(trigger, callsite); | |
2500 | default: | |
2501 | return -EINVAL; | |
2502 | } | |
2503 | } | |
2504 | ||
2505 | int lttng_trigger_enabler_attach_context(struct lttng_trigger_enabler *trigger_enabler, | |
2506 | struct lttng_kernel_context *context_param) | |
2507 | { | |
2508 | return -ENOSYS; | |
2509 | } | |
2510 | ||
2511 | static | |
2512 | void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler *trigger_enabler) | |
2513 | { | |
2514 | if (!trigger_enabler) { | |
2515 | return; | |
2516 | } | |
3c997079 | 2517 | |
4442bc1b JR |
2518 | list_del(&trigger_enabler->node); |
2519 | ||
2520 | lttng_enabler_destroy(lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
2521 | kfree(trigger_enabler); | |
3c997079 MD |
2522 | } |
2523 | ||
2524 | /* | |
4442bc1b | 2525 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2526 | * session. |
2527 | * Should be called with sessions mutex held. | |
2528 | */ | |
2529 | static | |
4442bc1b | 2530 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2531 | { |
4442bc1b | 2532 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2533 | struct lttng_event *event; |
2534 | ||
4442bc1b JR |
2535 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2536 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2537 | /* |
2538 | * For each event, if at least one of its enablers is enabled, | |
2539 | * and its channel and session transient states are enabled, we | |
2540 | * enable the event, else we disable it. | |
2541 | */ | |
2542 | list_for_each_entry(event, &session->events, list) { | |
2543 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2544 | struct lttng_bytecode_runtime *runtime; |
2545 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2546 | |
4ecb5ad5 MD |
2547 | switch (event->instrumentation) { |
2548 | case LTTNG_KERNEL_TRACEPOINT: | |
2549 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2550 | /* Enable events */ |
2551 | list_for_each_entry(enabler_ref, | |
2552 | &event->enablers_ref_head, node) { | |
2553 | if (enabler_ref->ref->enabled) { | |
2554 | enabled = 1; | |
2555 | break; | |
2556 | } | |
2557 | } | |
4ecb5ad5 MD |
2558 | break; |
2559 | default: | |
3c997079 MD |
2560 | /* Not handled with lazy sync. */ |
2561 | continue; | |
2562 | } | |
2563 | /* | |
2564 | * Enabled state is based on union of enablers, with | |
2565 | * intesection of session and channel transient enable | |
2566 | * states. | |
2567 | */ | |
2568 | enabled = enabled && session->tstate && event->chan->tstate; | |
2569 | ||
a8f2d0c7 | 2570 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2571 | /* |
2572 | * Sync tracepoint registration with event enabled | |
2573 | * state. | |
2574 | */ | |
2575 | if (enabled) { | |
2576 | register_event(event); | |
2577 | } else { | |
2578 | _lttng_event_unregister(event); | |
2579 | } | |
07dfc1d0 MD |
2580 | |
2581 | /* Check if has enablers without bytecode enabled */ | |
2582 | list_for_each_entry(enabler_ref, | |
2583 | &event->enablers_ref_head, node) { | |
2584 | if (enabler_ref->ref->enabled | |
2585 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2586 | has_enablers_without_bytecode = 1; | |
2587 | break; | |
2588 | } | |
2589 | } | |
2590 | event->has_enablers_without_bytecode = | |
2591 | has_enablers_without_bytecode; | |
2592 | ||
2593 | /* Enable filters */ | |
2594 | list_for_each_entry(runtime, | |
4442bc1b JR |
2595 | &event->filter_bytecode_runtime_head, node) |
2596 | lttng_bytecode_filter_sync_state(runtime); | |
3c997079 MD |
2597 | } |
2598 | } | |
2599 | ||
2600 | /* | |
2601 | * Apply enablers to session events, adding events to session if need | |
2602 | * be. It is required after each modification applied to an active | |
2603 | * session, and right before session "start". | |
2604 | * "lazy" sync means we only sync if required. | |
2605 | * Should be called with sessions mutex held. | |
2606 | */ | |
2607 | static | |
4442bc1b | 2608 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2609 | { |
2610 | /* We can skip if session is not active */ | |
2611 | if (!session->active) | |
2612 | return; | |
4442bc1b JR |
2613 | lttng_session_sync_event_enablers(session); |
2614 | } | |
2615 | ||
2616 | static | |
2617 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group) | |
2618 | { | |
2619 | struct lttng_trigger_enabler *trigger_enabler; | |
2620 | struct lttng_trigger *trigger; | |
2621 | ||
2622 | list_for_each_entry(trigger_enabler, &trigger_group->enablers_head, node) | |
2623 | lttng_trigger_enabler_ref_triggers(trigger_enabler); | |
2624 | ||
2625 | /* | |
2626 | * For each trigger, if at least one of its enablers is enabled, | |
2627 | * we enable the trigger, else we disable it. | |
2628 | */ | |
2629 | list_for_each_entry(trigger, &trigger_group->triggers_head, list) { | |
2630 | struct lttng_enabler_ref *enabler_ref; | |
2631 | struct lttng_bytecode_runtime *runtime; | |
2632 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2633 | ||
2634 | switch (trigger->instrumentation) { | |
2635 | case LTTNG_KERNEL_TRACEPOINT: | |
2636 | case LTTNG_KERNEL_SYSCALL: | |
2637 | /* Enable triggers */ | |
2638 | list_for_each_entry(enabler_ref, | |
2639 | &trigger->enablers_ref_head, node) { | |
2640 | if (enabler_ref->ref->enabled) { | |
2641 | enabled = 1; | |
2642 | break; | |
2643 | } | |
2644 | } | |
2645 | break; | |
2646 | default: | |
2647 | /* Not handled with sync. */ | |
2648 | continue; | |
2649 | } | |
2650 | ||
2651 | WRITE_ONCE(trigger->enabled, enabled); | |
2652 | /* | |
2653 | * Sync tracepoint registration with trigger enabled | |
2654 | * state. | |
2655 | */ | |
2656 | if (enabled) { | |
2657 | if (!trigger->registered) | |
2658 | register_trigger(trigger); | |
2659 | } else { | |
2660 | if (trigger->registered) | |
2661 | _lttng_trigger_unregister(trigger); | |
2662 | } | |
2663 | ||
2664 | /* Check if has enablers without bytecode enabled */ | |
2665 | list_for_each_entry(enabler_ref, | |
2666 | &trigger->enablers_ref_head, node) { | |
2667 | if (enabler_ref->ref->enabled | |
2668 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2669 | has_enablers_without_bytecode = 1; | |
2670 | break; | |
2671 | } | |
2672 | } | |
2673 | trigger->has_enablers_without_bytecode = | |
2674 | has_enablers_without_bytecode; | |
2675 | ||
2676 | /* Enable filters */ | |
2677 | list_for_each_entry(runtime, | |
2678 | &trigger->filter_bytecode_runtime_head, node) | |
2679 | lttng_bytecode_filter_sync_state(runtime); | |
2680 | ||
2681 | /* Enable captures */ | |
2682 | list_for_each_entry(runtime, | |
2683 | &trigger->capture_bytecode_runtime_head, node) | |
2684 | lttng_bytecode_capture_sync_state(runtime); | |
2685 | } | |
3c997079 MD |
2686 | } |
2687 | ||
1ec3f75a | 2688 | /* |
d83004aa JD |
2689 | * Serialize at most one packet worth of metadata into a metadata |
2690 | * channel. | |
92d9f5e6 MD |
2691 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2692 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2693 | * allows us to do racy operations such as looking for remaining space left in | |
2694 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2695 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2696 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2697 | * Returns the number of bytes written in the channel, 0 if no data |
2698 | * was written and a negative value on error. | |
1ec3f75a | 2699 | */ |
b3b8072b | 2700 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2701 | struct channel *chan, bool *coherent) |
d83004aa JD |
2702 | { |
2703 | struct lib_ring_buffer_ctx ctx; | |
2704 | int ret = 0; | |
2705 | size_t len, reserve_len; | |
2706 | ||
f613e3e6 | 2707 | /* |
92d9f5e6 MD |
2708 | * Ensure we support mutiple get_next / put sequences followed by |
2709 | * put_next. The metadata cache lock protects reading the metadata | |
2710 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2711 | * "flush" operations on the buffer invoked by different processes. | |
2712 | * Moreover, since the metadata cache memory can be reallocated, we | |
2713 | * need to have exclusive access against updates even though we only | |
2714 | * read it. | |
f613e3e6 | 2715 | */ |
92d9f5e6 | 2716 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2717 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2718 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2719 | goto end; |
f613e3e6 | 2720 | |
9616f0bf JD |
2721 | /* Metadata regenerated, change the version. */ |
2722 | if (stream->metadata_cache->version != stream->version) | |
2723 | stream->version = stream->metadata_cache->version; | |
2724 | ||
d83004aa | 2725 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2726 | stream->metadata_in; |
9de2c215 | 2727 | if (!len) |
de23d59d | 2728 | goto end; |
d83004aa | 2729 | reserve_len = min_t(size_t, |
b3b8072b | 2730 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2731 | len); |
b3b8072b | 2732 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2733 | sizeof(char), -1); |
2734 | /* | |
2735 | * If reservation failed, return an error to the caller. | |
2736 | */ | |
b3b8072b | 2737 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2738 | if (ret != 0) { |
2739 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2740 | stream->coherent = false; |
d83004aa JD |
2741 | goto end; |
2742 | } | |
b3b8072b | 2743 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2744 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2745 | reserve_len); |
b3b8072b | 2746 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2747 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2748 | if (reserve_len < len) |
8b97fd42 MD |
2749 | stream->coherent = false; |
2750 | else | |
2751 | stream->coherent = true; | |
d83004aa JD |
2752 | ret = reserve_len; |
2753 | ||
2754 | end: | |
8b97fd42 MD |
2755 | if (coherent) |
2756 | *coherent = stream->coherent; | |
92d9f5e6 | 2757 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2758 | return ret; |
2759 | } | |
2760 | ||
8b97fd42 MD |
2761 | static |
2762 | void lttng_metadata_begin(struct lttng_session *session) | |
2763 | { | |
3e75e2a7 MD |
2764 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2765 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2766 | } |
2767 | ||
2768 | static | |
2769 | void lttng_metadata_end(struct lttng_session *session) | |
2770 | { | |
3e75e2a7 MD |
2771 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2772 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2773 | struct lttng_metadata_stream *stream; | |
2774 | ||
3e75e2a7 MD |
2775 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2776 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2777 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2778 | } |
8b97fd42 MD |
2779 | } |
2780 | ||
d83004aa JD |
2781 | /* |
2782 | * Write the metadata to the metadata cache. | |
2783 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2784 | * The metadata cache lock protects us from concurrent read access from |
2785 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2786 | * The content of the printf is printed as a single atomic metadata |
2787 | * transaction. | |
d83004aa | 2788 | */ |
a90917c3 | 2789 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2790 | const char *fmt, ...) |
2791 | { | |
c099397a | 2792 | char *str; |
d83004aa | 2793 | size_t len; |
c099397a MD |
2794 | va_list ap; |
2795 | ||
585e5dcc | 2796 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2797 | |
2798 | va_start(ap, fmt); | |
2799 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2800 | va_end(ap); | |
2801 | if (!str) | |
2802 | return -ENOMEM; | |
2803 | ||
1ec3f75a | 2804 | len = strlen(str); |
3e75e2a7 | 2805 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2806 | if (session->metadata_cache->metadata_written + len > |
2807 | session->metadata_cache->cache_alloc) { | |
2808 | char *tmp_cache_realloc; | |
2809 | unsigned int tmp_cache_alloc_size; | |
2810 | ||
2811 | tmp_cache_alloc_size = max_t(unsigned int, | |
2812 | session->metadata_cache->cache_alloc + len, | |
2813 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2814 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2815 | if (!tmp_cache_realloc) |
2816 | goto err; | |
a606b6e8 ML |
2817 | if (session->metadata_cache->data) { |
2818 | memcpy(tmp_cache_realloc, | |
2819 | session->metadata_cache->data, | |
2820 | session->metadata_cache->cache_alloc); | |
2821 | vfree(session->metadata_cache->data); | |
2822 | } | |
2823 | ||
d83004aa JD |
2824 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2825 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2826 | } |
d83004aa JD |
2827 | memcpy(session->metadata_cache->data + |
2828 | session->metadata_cache->metadata_written, | |
2829 | str, len); | |
2830 | session->metadata_cache->metadata_written += len; | |
c099397a | 2831 | kfree(str); |
d83004aa | 2832 | |
d83004aa JD |
2833 | return 0; |
2834 | ||
2835 | err: | |
2836 | kfree(str); | |
2837 | return -ENOMEM; | |
c099397a MD |
2838 | } |
2839 | ||
f513b2bf MD |
2840 | static |
2841 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2842 | { | |
2843 | size_t i; | |
2844 | ||
2845 | for (i = 0; i < nesting; i++) { | |
2846 | int ret; | |
2847 | ||
2848 | ret = lttng_metadata_printf(session, " "); | |
2849 | if (ret) { | |
2850 | return ret; | |
2851 | } | |
2852 | } | |
2853 | return 0; | |
2854 | } | |
2855 | ||
ceabb767 MD |
2856 | static |
2857 | int lttng_field_name_statedump(struct lttng_session *session, | |
2858 | const struct lttng_event_field *field, | |
2859 | size_t nesting) | |
2860 | { | |
2861 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2862 | } | |
2863 | ||
2864 | static | |
2865 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2866 | const struct lttng_type *type, | |
2867 | size_t nesting) | |
2868 | { | |
2869 | int ret; | |
2870 | ||
2871 | WARN_ON_ONCE(type->atype != atype_integer); | |
2872 | ret = print_tabs(session, nesting); | |
2873 | if (ret) | |
2874 | return ret; | |
2875 | ret = lttng_metadata_printf(session, | |
2876 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2877 | type->u.integer.size, | |
2878 | type->u.integer.alignment, | |
2879 | type->u.integer.signedness, | |
2880 | (type->u.integer.encoding == lttng_encode_none) | |
2881 | ? "none" | |
2882 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2883 | ? "UTF8" | |
2884 | : "ASCII", | |
2885 | type->u.integer.base, | |
2886 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2887 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2888 | #else | |
2889 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2890 | #endif | |
2891 | ); | |
2892 | return ret; | |
2893 | } | |
2894 | ||
f513b2bf MD |
2895 | /* |
2896 | * Must be called with sessions_mutex held. | |
2897 | */ | |
2898 | static | |
2899 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2900 | const struct lttng_type *type, | |
2901 | size_t nesting) | |
2902 | { | |
2903 | int ret; | |
2904 | uint32_t i, nr_fields; | |
ceabb767 MD |
2905 | unsigned int alignment; |
2906 | ||
2907 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2908 | |
2909 | ret = print_tabs(session, nesting); | |
2910 | if (ret) | |
2911 | return ret; | |
2912 | ret = lttng_metadata_printf(session, | |
2913 | "struct {\n"); | |
2914 | if (ret) | |
2915 | return ret; | |
ceabb767 | 2916 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2917 | for (i = 0; i < nr_fields; i++) { |
2918 | const struct lttng_event_field *iter_field; | |
2919 | ||
ceabb767 | 2920 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2921 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2922 | if (ret) | |
2923 | return ret; | |
2924 | } | |
2925 | ret = print_tabs(session, nesting); | |
2926 | if (ret) | |
2927 | return ret; | |
ceabb767 MD |
2928 | alignment = type->u.struct_nestable.alignment; |
2929 | if (alignment) { | |
2930 | ret = lttng_metadata_printf(session, | |
2931 | "} align(%u)", | |
2932 | alignment); | |
2933 | } else { | |
2934 | ret = lttng_metadata_printf(session, | |
2935 | "}"); | |
2936 | } | |
f513b2bf MD |
2937 | return ret; |
2938 | } | |
2939 | ||
2940 | /* | |
2941 | * Must be called with sessions_mutex held. | |
2942 | */ | |
2943 | static | |
ceabb767 | 2944 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2945 | const struct lttng_event_field *field, |
2946 | size_t nesting) | |
2947 | { | |
2948 | int ret; | |
2949 | ||
2950 | ret = _lttng_struct_type_statedump(session, | |
2951 | &field->type, nesting); | |
2952 | if (ret) | |
2953 | return ret; | |
ceabb767 | 2954 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2955 | } |
2956 | ||
65c85aa6 MD |
2957 | /* |
2958 | * Must be called with sessions_mutex held. | |
2959 | */ | |
2960 | static | |
2961 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2962 | const struct lttng_type *type, | |
2963 | size_t nesting) | |
2964 | { | |
2965 | int ret; | |
2966 | uint32_t i, nr_choices; | |
2967 | ||
ceabb767 MD |
2968 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2969 | /* | |
2970 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2971 | */ | |
2972 | if (type->u.variant_nestable.alignment != 0) | |
2973 | return -EINVAL; | |
65c85aa6 MD |
2974 | ret = print_tabs(session, nesting); |
2975 | if (ret) | |
2976 | return ret; | |
2977 | ret = lttng_metadata_printf(session, | |
2978 | "variant <_%s> {\n", | |
ceabb767 | 2979 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2980 | if (ret) |
2981 | return ret; | |
ceabb767 | 2982 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2983 | for (i = 0; i < nr_choices; i++) { |
2984 | const struct lttng_event_field *iter_field; | |
2985 | ||
ceabb767 | 2986 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2987 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2988 | if (ret) | |
2989 | return ret; | |
2990 | } | |
2991 | ret = print_tabs(session, nesting); | |
2992 | if (ret) | |
2993 | return ret; | |
2994 | ret = lttng_metadata_printf(session, | |
2995 | "}"); | |
2996 | return ret; | |
2997 | } | |
2998 | ||
2999 | /* | |
3000 | * Must be called with sessions_mutex held. | |
3001 | */ | |
3002 | static | |
ceabb767 | 3003 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3004 | const struct lttng_event_field *field, |
3005 | size_t nesting) | |
3006 | { | |
3007 | int ret; | |
3008 | ||
3009 | ret = _lttng_variant_type_statedump(session, | |
3010 | &field->type, nesting); | |
3011 | if (ret) | |
3012 | return ret; | |
ceabb767 | 3013 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3014 | } |
3015 | ||
f513b2bf MD |
3016 | /* |
3017 | * Must be called with sessions_mutex held. | |
3018 | */ | |
3019 | static | |
ceabb767 | 3020 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3021 | const struct lttng_event_field *field, |
3022 | size_t nesting) | |
3023 | { | |
3024 | int ret; | |
3025 | const struct lttng_type *elem_type; | |
3026 | ||
ceabb767 MD |
3027 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
3028 | ||
3029 | if (field->type.u.array_nestable.alignment) { | |
3030 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3031 | if (ret) |
3032 | return ret; | |
ceabb767 MD |
3033 | ret = lttng_metadata_printf(session, |
3034 | "struct { } align(%u) _%s_padding;\n", | |
3035 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3036 | field->name); | |
3037 | if (ret) | |
3038 | return ret; | |
3039 | } | |
3040 | /* | |
3041 | * Nested compound types: Only array of structures and variants are | |
3042 | * currently supported. | |
3043 | */ | |
3044 | elem_type = field->type.u.array_nestable.elem_type; | |
3045 | switch (elem_type->atype) { | |
3046 | case atype_integer: | |
3047 | case atype_struct_nestable: | |
3048 | case atype_variant_nestable: | |
3049 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3050 | if (ret) |
3051 | return ret; | |
3052 | break; | |
ceabb767 | 3053 | |
f513b2bf MD |
3054 | default: |
3055 | return -EINVAL; | |
3056 | } | |
3057 | ret = lttng_metadata_printf(session, | |
3058 | " _%s[%u];\n", | |
3059 | field->name, | |
ceabb767 | 3060 | field->type.u.array_nestable.length); |
f513b2bf MD |
3061 | return ret; |
3062 | } | |
3063 | ||
3064 | /* | |
3065 | * Must be called with sessions_mutex held. | |
3066 | */ | |
3067 | static | |
ceabb767 | 3068 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3069 | const struct lttng_event_field *field, |
3070 | size_t nesting) | |
3071 | { | |
3072 | int ret; | |
3073 | const char *length_name; | |
3074 | const struct lttng_type *elem_type; | |
3075 | ||
ceabb767 | 3076 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3077 | |
ceabb767 MD |
3078 | length_name = field->type.u.sequence_nestable.length_name; |
3079 | ||
3080 | if (field->type.u.sequence_nestable.alignment) { | |
3081 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3082 | if (ret) |
3083 | return ret; | |
ceabb767 MD |
3084 | ret = lttng_metadata_printf(session, |
3085 | "struct { } align(%u) _%s_padding;\n", | |
3086 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3087 | field->name); | |
3088 | if (ret) | |
3089 | return ret; | |
3090 | } | |
3091 | ||
3092 | /* | |
3093 | * Nested compound types: Only array of structures and variants are | |
3094 | * currently supported. | |
3095 | */ | |
3096 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3097 | switch (elem_type->atype) { | |
3098 | case atype_integer: | |
3099 | case atype_struct_nestable: | |
3100 | case atype_variant_nestable: | |
3101 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3102 | if (ret) |
3103 | return ret; | |
3104 | break; | |
ceabb767 | 3105 | |
f513b2bf MD |
3106 | default: |
3107 | return -EINVAL; | |
3108 | } | |
3109 | ret = lttng_metadata_printf(session, | |
3110 | " _%s[ _%s ];\n", | |
3111 | field->name, | |
ceabb767 | 3112 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3113 | return ret; |
3114 | } | |
3115 | ||
141ddf28 MD |
3116 | /* |
3117 | * Must be called with sessions_mutex held. | |
3118 | */ | |
3119 | static | |
ceabb767 MD |
3120 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3121 | const struct lttng_type *type, | |
141ddf28 MD |
3122 | size_t nesting) |
3123 | { | |
3124 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3125 | const struct lttng_type *container_type; |
141ddf28 MD |
3126 | int ret; |
3127 | unsigned int i, nr_entries; | |
3128 | ||
ceabb767 MD |
3129 | container_type = type->u.enum_nestable.container_type; |
3130 | if (container_type->atype != atype_integer) { | |
3131 | ret = -EINVAL; | |
3132 | goto end; | |
3133 | } | |
3134 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3135 | nr_entries = enum_desc->nr_entries; |
3136 | ||
3137 | ret = print_tabs(session, nesting); | |
3138 | if (ret) | |
3139 | goto end; | |
ceabb767 MD |
3140 | ret = lttng_metadata_printf(session, "enum : "); |
3141 | if (ret) | |
3142 | goto end; | |
3143 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3144 | if (ret) |
ceabb767 MD |
3145 | goto end; |
3146 | ret = lttng_metadata_printf(session, " {\n"); | |
3147 | if (ret) | |
3148 | goto end; | |
141ddf28 MD |
3149 | /* Dump all entries */ |
3150 | for (i = 0; i < nr_entries; i++) { | |
3151 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3152 | int j, len; | |
3153 | ||
3154 | ret = print_tabs(session, nesting + 1); | |
3155 | if (ret) | |
3156 | goto end; | |
3157 | ret = lttng_metadata_printf(session, | |
3158 | "\""); | |
3159 | if (ret) | |
3160 | goto end; | |
3161 | len = strlen(entry->string); | |
3162 | /* Escape the character '"' */ | |
3163 | for (j = 0; j < len; j++) { | |
3164 | char c = entry->string[j]; | |
3165 | ||
3166 | switch (c) { | |
3167 | case '"': | |
3168 | ret = lttng_metadata_printf(session, | |
3169 | "\\\""); | |
3170 | break; | |
3171 | case '\\': | |
3172 | ret = lttng_metadata_printf(session, | |
3173 | "\\\\"); | |
3174 | break; | |
3175 | default: | |
3176 | ret = lttng_metadata_printf(session, | |
3177 | "%c", c); | |
3178 | break; | |
3179 | } | |
3180 | if (ret) | |
3181 | goto end; | |
3182 | } | |
08ad1061 PP |
3183 | ret = lttng_metadata_printf(session, "\""); |
3184 | if (ret) | |
3185 | goto end; | |
3186 | ||
3187 | if (entry->options.is_auto) { | |
3188 | ret = lttng_metadata_printf(session, ",\n"); | |
3189 | if (ret) | |
3190 | goto end; | |
141ddf28 | 3191 | } else { |
7c559490 MD |
3192 | ret = lttng_metadata_printf(session, |
3193 | " = "); | |
3194 | if (ret) | |
3195 | goto end; | |
3196 | if (entry->start.signedness) | |
141ddf28 | 3197 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3198 | "%lld", (long long) entry->start.value); |
3199 | else | |
3200 | ret = lttng_metadata_printf(session, | |
3201 | "%llu", entry->start.value); | |
3202 | if (ret) | |
3203 | goto end; | |
3204 | if (entry->start.signedness == entry->end.signedness && | |
3205 | entry->start.value | |
3206 | == entry->end.value) { | |
141ddf28 | 3207 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3208 | ",\n"); |
3209 | } else { | |
3210 | if (entry->end.signedness) { | |
3211 | ret = lttng_metadata_printf(session, | |
3212 | " ... %lld,\n", | |
3213 | (long long) entry->end.value); | |
3214 | } else { | |
3215 | ret = lttng_metadata_printf(session, | |
3216 | " ... %llu,\n", | |
3217 | entry->end.value); | |
3218 | } | |
141ddf28 | 3219 | } |
7c559490 MD |
3220 | if (ret) |
3221 | goto end; | |
141ddf28 | 3222 | } |
141ddf28 MD |
3223 | } |
3224 | ret = print_tabs(session, nesting); | |
3225 | if (ret) | |
3226 | goto end; | |
ceabb767 | 3227 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3228 | end: |
3229 | return ret; | |
3230 | } | |
3231 | ||
d83004aa JD |
3232 | /* |
3233 | * Must be called with sessions_mutex held. | |
3234 | */ | |
c099397a | 3235 | static |
ceabb767 MD |
3236 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3237 | const struct lttng_event_field *field, | |
3238 | size_t nesting) | |
3239 | { | |
3240 | int ret; | |
3241 | ||
3242 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3243 | if (ret) | |
3244 | return ret; | |
3245 | return lttng_field_name_statedump(session, field, nesting); | |
3246 | } | |
3247 | ||
3248 | static | |
3249 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3250 | const struct lttng_event_field *field, | |
3251 | size_t nesting) | |
3252 | { | |
3253 | int ret; | |
3254 | ||
3255 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3256 | if (ret) | |
3257 | return ret; | |
3258 | return lttng_field_name_statedump(session, field, nesting); | |
3259 | } | |
3260 | ||
3261 | static | |
3262 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3263 | const struct lttng_type *type, | |
3264 | size_t nesting) | |
3265 | { | |
3266 | int ret; | |
3267 | ||
3268 | WARN_ON_ONCE(type->atype != atype_string); | |
3269 | /* Default encoding is UTF8 */ | |
3270 | ret = print_tabs(session, nesting); | |
3271 | if (ret) | |
3272 | return ret; | |
3273 | ret = lttng_metadata_printf(session, | |
3274 | "string%s", | |
3275 | type->u.string.encoding == lttng_encode_ASCII ? | |
3276 | " { encoding = ASCII; }" : ""); | |
3277 | return ret; | |
3278 | } | |
3279 | ||
3280 | static | |
3281 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3282 | const struct lttng_event_field *field, |
3283 | size_t nesting) | |
ceabb767 MD |
3284 | { |
3285 | int ret; | |
3286 | ||
3287 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3288 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3289 | if (ret) | |
3290 | return ret; | |
3291 | return lttng_field_name_statedump(session, field, nesting); | |
3292 | } | |
3293 | ||
3294 | /* | |
3295 | * Must be called with sessions_mutex held. | |
3296 | */ | |
3297 | static | |
3298 | int _lttng_type_statedump(struct lttng_session *session, | |
3299 | const struct lttng_type *type, | |
3300 | size_t nesting) | |
c099397a | 3301 | { |
c099397a | 3302 | int ret = 0; |
c099397a | 3303 | |
ceabb767 | 3304 | switch (type->atype) { |
8070f5c0 | 3305 | case atype_integer: |
ceabb767 | 3306 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3307 | break; |
ceabb767 MD |
3308 | case atype_enum_nestable: |
3309 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3310 | break; |
ceabb767 MD |
3311 | case atype_string: |
3312 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3313 | break; | |
3314 | case atype_struct_nestable: | |
3315 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3316 | break; |
ceabb767 MD |
3317 | case atype_variant_nestable: |
3318 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3319 | break; | |
3320 | ||
3321 | /* Nested arrays and sequences are not supported yet. */ | |
3322 | case atype_array_nestable: | |
3323 | case atype_sequence_nestable: | |
3324 | default: | |
3325 | WARN_ON_ONCE(1); | |
3326 | return -EINVAL; | |
8070f5c0 | 3327 | } |
ceabb767 MD |
3328 | return ret; |
3329 | } | |
8070f5c0 | 3330 | |
ceabb767 MD |
3331 | /* |
3332 | * Must be called with sessions_mutex held. | |
3333 | */ | |
3334 | static | |
3335 | int _lttng_field_statedump(struct lttng_session *session, | |
3336 | const struct lttng_event_field *field, | |
3337 | size_t nesting) | |
3338 | { | |
3339 | int ret = 0; | |
27d2368e | 3340 | |
ceabb767 MD |
3341 | switch (field->type.atype) { |
3342 | case atype_integer: | |
3343 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3344 | break; | |
3345 | case atype_enum_nestable: | |
3346 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3347 | break; |
8070f5c0 | 3348 | case atype_string: |
ceabb767 | 3349 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3350 | break; |
ceabb767 MD |
3351 | case atype_struct_nestable: |
3352 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3353 | break; |
ceabb767 MD |
3354 | case atype_array_nestable: |
3355 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3356 | break; |
ceabb767 MD |
3357 | case atype_sequence_nestable: |
3358 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3359 | break; |
ceabb767 MD |
3360 | case atype_variant_nestable: |
3361 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3362 | break; |
f513b2bf | 3363 | |
8070f5c0 MD |
3364 | default: |
3365 | WARN_ON_ONCE(1); | |
3366 | return -EINVAL; | |
3367 | } | |
3368 | return ret; | |
3369 | } | |
3370 | ||
3371 | static | |
a90917c3 | 3372 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3373 | struct lttng_ctx *ctx) |
3374 | { | |
3375 | int ret = 0; | |
3376 | int i; | |
3377 | ||
3378 | if (!ctx) | |
3379 | return 0; | |
3380 | for (i = 0; i < ctx->nr_fields; i++) { | |
3381 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3382 | ||
f513b2bf | 3383 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3384 | if (ret) |
3385 | return ret; | |
3386 | } | |
3387 | return ret; | |
3388 | } | |
3389 | ||
3390 | static | |
a90917c3 MD |
3391 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3392 | struct lttng_event *event) | |
8070f5c0 MD |
3393 | { |
3394 | const struct lttng_event_desc *desc = event->desc; | |
3395 | int ret = 0; | |
3396 | int i; | |
3397 | ||
3398 | for (i = 0; i < desc->nr_fields; i++) { | |
3399 | const struct lttng_event_field *field = &desc->fields[i]; | |
3400 | ||
f513b2bf | 3401 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3402 | if (ret) |
3403 | return ret; | |
c099397a MD |
3404 | } |
3405 | return ret; | |
3406 | } | |
3407 | ||
d83004aa JD |
3408 | /* |
3409 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3410 | * The entire event metadata is printed as a single atomic metadata |
3411 | * transaction. | |
d83004aa | 3412 | */ |
c099397a | 3413 | static |
a90917c3 MD |
3414 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3415 | struct lttng_channel *chan, | |
3416 | struct lttng_event *event) | |
c099397a MD |
3417 | { |
3418 | int ret = 0; | |
3419 | ||
585e5dcc | 3420 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3421 | return 0; |
d83004aa | 3422 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3423 | return 0; |
3424 | ||
8b97fd42 MD |
3425 | lttng_metadata_begin(session); |
3426 | ||
c099397a MD |
3427 | ret = lttng_metadata_printf(session, |
3428 | "event {\n" | |
ae734547 | 3429 | " name = \"%s\";\n" |
c099397a | 3430 | " id = %u;\n" |
b9074a1b | 3431 | " stream_id = %u;\n", |
c099397a MD |
3432 | event->desc->name, |
3433 | event->id, | |
3434 | event->chan->id); | |
3435 | if (ret) | |
3436 | goto end; | |
3437 | ||
b9074a1b MD |
3438 | if (event->ctx) { |
3439 | ret = lttng_metadata_printf(session, | |
3440 | " context := struct {\n"); | |
3441 | if (ret) | |
3442 | goto end; | |
3443 | } | |
a90917c3 | 3444 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3445 | if (ret) |
3446 | goto end; | |
b9074a1b MD |
3447 | if (event->ctx) { |
3448 | ret = lttng_metadata_printf(session, | |
3449 | " };\n"); | |
3450 | if (ret) | |
3451 | goto end; | |
3452 | } | |
8070f5c0 MD |
3453 | |
3454 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3455 | " fields := struct {\n" |
3456 | ); | |
3457 | if (ret) | |
3458 | goto end; | |
3459 | ||
a90917c3 | 3460 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3461 | if (ret) |
3462 | goto end; | |
3463 | ||
3464 | /* | |
3465 | * LTTng space reservation can only reserve multiples of the | |
3466 | * byte size. | |
3467 | */ | |
3468 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3469 | " };\n" |
3470 | "};\n\n"); | |
c099397a MD |
3471 | if (ret) |
3472 | goto end; | |
3473 | ||
c099397a MD |
3474 | event->metadata_dumped = 1; |
3475 | end: | |
8b97fd42 | 3476 | lttng_metadata_end(session); |
c099397a MD |
3477 | return ret; |
3478 | ||
3479 | } | |
3480 | ||
d83004aa JD |
3481 | /* |
3482 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3483 | * The entire channel metadata is printed as a single atomic metadata |
3484 | * transaction. | |
d83004aa | 3485 | */ |
c099397a | 3486 | static |
a90917c3 MD |
3487 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3488 | struct lttng_channel *chan) | |
c099397a MD |
3489 | { |
3490 | int ret = 0; | |
3491 | ||
585e5dcc | 3492 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3493 | return 0; |
d83004aa JD |
3494 | |
3495 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3496 | return 0; |
3497 | ||
8b97fd42 MD |
3498 | lttng_metadata_begin(session); |
3499 | ||
c099397a MD |
3500 | WARN_ON_ONCE(!chan->header_type); |
3501 | ret = lttng_metadata_printf(session, | |
3502 | "stream {\n" | |
3503 | " id = %u;\n" | |
9115fbdc | 3504 | " event.header := %s;\n" |
b9074a1b | 3505 | " packet.context := struct packet_context;\n", |
c099397a MD |
3506 | chan->id, |
3507 | chan->header_type == 1 ? "struct event_header_compact" : | |
3508 | "struct event_header_large"); | |
3509 | if (ret) | |
3510 | goto end; | |
3511 | ||
b9074a1b MD |
3512 | if (chan->ctx) { |
3513 | ret = lttng_metadata_printf(session, | |
3514 | " event.context := struct {\n"); | |
3515 | if (ret) | |
3516 | goto end; | |
3517 | } | |
a90917c3 | 3518 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3519 | if (ret) |
3520 | goto end; | |
b9074a1b MD |
3521 | if (chan->ctx) { |
3522 | ret = lttng_metadata_printf(session, | |
3523 | " };\n"); | |
3524 | if (ret) | |
3525 | goto end; | |
3526 | } | |
8070f5c0 MD |
3527 | |
3528 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3529 | "};\n\n"); |
8070f5c0 | 3530 | |
c099397a MD |
3531 | chan->metadata_dumped = 1; |
3532 | end: | |
8b97fd42 | 3533 | lttng_metadata_end(session); |
c099397a MD |
3534 | return ret; |
3535 | } | |
3536 | ||
d83004aa JD |
3537 | /* |
3538 | * Must be called with sessions_mutex held. | |
3539 | */ | |
9115fbdc | 3540 | static |
a90917c3 | 3541 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3542 | { |
3543 | return lttng_metadata_printf(session, | |
3544 | "struct packet_context {\n" | |
a3ccff4f MD |
3545 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3546 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3547 | " uint64_t content_size;\n" |
3548 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3549 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3550 | " unsigned long events_discarded;\n" |
9115fbdc | 3551 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3552 | "};\n\n" |
9115fbdc MD |
3553 | ); |
3554 | } | |
3555 | ||
3556 | /* | |
3557 | * Compact header: | |
3558 | * id: range: 0 - 30. | |
3559 | * id 31 is reserved to indicate an extended header. | |
3560 | * | |
3561 | * Large header: | |
3562 | * id: range: 0 - 65534. | |
3563 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3564 | * |
3565 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3566 | */ |
3567 | static | |
a90917c3 | 3568 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3569 | { |
3570 | return lttng_metadata_printf(session, | |
3571 | "struct event_header_compact {\n" | |
3572 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3573 | " variant <id> {\n" | |
3574 | " struct {\n" | |
a3ccff4f | 3575 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3576 | " } compact;\n" |
3577 | " struct {\n" | |
3578 | " uint32_t id;\n" | |
a3ccff4f | 3579 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3580 | " } extended;\n" |
3581 | " } v;\n" | |
3582 | "} align(%u);\n" | |
3583 | "\n" | |
3584 | "struct event_header_large {\n" | |
3585 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3586 | " variant <id> {\n" | |
3587 | " struct {\n" | |
a3ccff4f | 3588 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3589 | " } compact;\n" |
3590 | " struct {\n" | |
3591 | " uint32_t id;\n" | |
a3ccff4f | 3592 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3593 | " } extended;\n" |
3594 | " } v;\n" | |
3595 | "} align(%u);\n\n", | |
a90917c3 MD |
3596 | lttng_alignof(uint32_t) * CHAR_BIT, |
3597 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3598 | ); |
3599 | } | |
3600 | ||
a3ccff4f MD |
3601 | /* |
3602 | * Approximation of NTP time of day to clock monotonic correlation, | |
3603 | * taken at start of trace. | |
3604 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3605 | * in future versions. | |
5283350b MD |
3606 | * This function may return a negative offset. It may happen if the |
3607 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3608 | * |
3609 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3610 | * y2038 compliant. | |
a3ccff4f MD |
3611 | */ |
3612 | static | |
8967b2a3 | 3613 | int64_t measure_clock_offset(void) |
a3ccff4f | 3614 | { |
dcb93448 | 3615 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3616 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3617 | int64_t offset; |
a3ccff4f | 3618 | unsigned long flags; |
3636085f MJ |
3619 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3620 | struct timespec64 rts = { 0, 0 }; | |
3621 | #else | |
3622 | struct timespec rts = { 0, 0 }; | |
3623 | #endif | |
a3ccff4f MD |
3624 | |
3625 | /* Disable interrupts to increase correlation precision. */ | |
3626 | local_irq_save(flags); | |
3627 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3628 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3629 | ktime_get_real_ts64(&rts); | |
3630 | #else | |
216b6baa | 3631 | getnstimeofday(&rts); |
3636085f | 3632 | #endif |
a3ccff4f MD |
3633 | monotonic[1] = trace_clock_read64(); |
3634 | local_irq_restore(flags); | |
3635 | ||
dcb93448 | 3636 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3637 | realtime = (uint64_t) rts.tv_sec * tcf; |
3638 | if (tcf == NSEC_PER_SEC) { | |
3639 | realtime += rts.tv_nsec; | |
3640 | } else { | |
3641 | uint64_t n = rts.tv_nsec * tcf; | |
3642 | ||
3643 | do_div(n, NSEC_PER_SEC); | |
3644 | realtime += n; | |
3645 | } | |
dcb93448 | 3646 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3647 | return offset; |
3648 | } | |
3649 | ||
3eb95be4 JR |
3650 | static |
3651 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3652 | { | |
0f3eaad4 | 3653 | int ret = 0; |
3eb95be4 JR |
3654 | size_t i; |
3655 | char cur; | |
3656 | ||
3657 | i = 0; | |
3658 | cur = string[i]; | |
3659 | while (cur != '\0') { | |
3660 | switch (cur) { | |
3661 | case '\n': | |
3662 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3663 | break; | |
3664 | case '\\': | |
3665 | case '"': | |
3666 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3667 | if (ret) | |
3668 | goto error; | |
3669 | /* We still print the current char */ | |
3670 | /* Fallthrough */ | |
3671 | default: | |
3672 | ret = lttng_metadata_printf(session, "%c", cur); | |
3673 | break; | |
3674 | } | |
3675 | ||
3676 | if (ret) | |
3677 | goto error; | |
3678 | ||
3679 | cur = string[++i]; | |
3680 | } | |
3681 | error: | |
3682 | return ret; | |
3683 | } | |
3684 | ||
3685 | static | |
1c88f269 JR |
3686 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3687 | const char *field_value) | |
3eb95be4 JR |
3688 | { |
3689 | int ret; | |
3690 | ||
1c88f269 | 3691 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3692 | if (ret) |
3693 | goto error; | |
3694 | ||
1c88f269 | 3695 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3696 | if (ret) |
3697 | goto error; | |
3698 | ||
3699 | ret = lttng_metadata_printf(session, "\";\n"); | |
3700 | ||
3701 | error: | |
3702 | return ret; | |
3703 | } | |
3704 | ||
c099397a MD |
3705 | /* |
3706 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3707 | * Must be called with sessions_mutex held. |
c099397a MD |
3708 | */ |
3709 | static | |
a90917c3 | 3710 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3711 | { |
30bdb6e4 | 3712 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3713 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3714 | const char *product_uuid; |
a90917c3 MD |
3715 | struct lttng_channel *chan; |
3716 | struct lttng_event *event; | |
c099397a MD |
3717 | int ret = 0; |
3718 | ||
585e5dcc | 3719 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3720 | return 0; |
8b97fd42 MD |
3721 | |
3722 | lttng_metadata_begin(session); | |
3723 | ||
c099397a MD |
3724 | if (session->metadata_dumped) |
3725 | goto skip_session; | |
c099397a | 3726 | |
d793d5e1 | 3727 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3728 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3729 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3730 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3731 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3732 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3733 | |
3734 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3735 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3736 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3737 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3738 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3739 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3740 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3741 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3742 | "\n" |
3743 | "trace {\n" | |
3744 | " major = %u;\n" | |
3745 | " minor = %u;\n" | |
30bdb6e4 | 3746 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3747 | " byte_order = %s;\n" |
3748 | " packet.header := struct {\n" | |
3749 | " uint32_t magic;\n" | |
1ec3f75a | 3750 | " uint8_t uuid[16];\n" |
d793d5e1 | 3751 | " uint32_t stream_id;\n" |
5594698f | 3752 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3753 | " };\n" |
d793d5e1 | 3754 | "};\n\n", |
a90917c3 MD |
3755 | lttng_alignof(uint8_t) * CHAR_BIT, |
3756 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3757 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3758 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3759 | sizeof(unsigned long) * CHAR_BIT, |
3760 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3761 | CTF_SPEC_MAJOR, |
3762 | CTF_SPEC_MINOR, | |
d793d5e1 | 3763 | uuid_s, |
5214fa50 | 3764 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3765 | "be" |
3766 | #else | |
3767 | "le" | |
3768 | #endif | |
3769 | ); | |
3770 | if (ret) | |
3771 | goto end; | |
3772 | ||
99dc9597 MD |
3773 | ret = lttng_metadata_printf(session, |
3774 | "env {\n" | |
a6058143 | 3775 | " hostname = \"%s\";\n" |
c6c9e10f | 3776 | " domain = \"kernel\";\n" |
99dc9597 | 3777 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3778 | " kernel_release = \"%s\";\n" |
3779 | " kernel_version = \"%s\";\n" | |
3780 | " tracer_name = \"lttng-modules\";\n" | |
3781 | " tracer_major = %d;\n" | |
3782 | " tracer_minor = %d;\n" | |
3783 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3784 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3785 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3786 | utsname()->sysname, |
3787 | utsname()->release, | |
c6c9e10f MD |
3788 | utsname()->version, |
3789 | LTTNG_MODULES_MAJOR_VERSION, | |
3790 | LTTNG_MODULES_MINOR_VERSION, | |
3791 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3792 | ); |
3793 | if (ret) | |
3794 | goto end; | |
3795 | ||
1c88f269 JR |
3796 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3797 | if (ret) | |
3798 | goto end; | |
3799 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3800 | session->creation_time); | |
3eb95be4 JR |
3801 | if (ret) |
3802 | goto end; | |
3803 | ||
c88f762e GB |
3804 | /* Add the product UUID to the 'env' section */ |
3805 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3806 | if (product_uuid) { | |
3807 | ret = lttng_metadata_printf(session, | |
3808 | " product_uuid = \"%s\";\n", | |
3809 | product_uuid | |
3810 | ); | |
3811 | if (ret) | |
3812 | goto end; | |
3813 | } | |
3814 | ||
3815 | /* Close the 'env' section */ | |
3eb95be4 JR |
3816 | ret = lttng_metadata_printf(session, "};\n\n"); |
3817 | if (ret) | |
3818 | goto end; | |
3819 | ||
a3ccff4f MD |
3820 | ret = lttng_metadata_printf(session, |
3821 | "clock {\n" | |
2754583e MD |
3822 | " name = \"%s\";\n", |
3823 | trace_clock_name() | |
a82c63f1 MD |
3824 | ); |
3825 | if (ret) | |
3826 | goto end; | |
3827 | ||
3828 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3829 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3830 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3831 | clock_uuid_s |
3832 | ); | |
3833 | if (ret) | |
3834 | goto end; | |
3835 | } | |
3836 | ||
3837 | ret = lttng_metadata_printf(session, | |
2754583e | 3838 | " description = \"%s\";\n" |
a3ccff4f MD |
3839 | " freq = %llu; /* Frequency, in Hz */\n" |
3840 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3841 | " offset = %lld;\n" |
a3ccff4f | 3842 | "};\n\n", |
2754583e | 3843 | trace_clock_description(), |
a3ccff4f | 3844 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3845 | (long long) measure_clock_offset() |
a3ccff4f MD |
3846 | ); |
3847 | if (ret) | |
3848 | goto end; | |
3849 | ||
3850 | ret = lttng_metadata_printf(session, | |
3851 | "typealias integer {\n" | |
3852 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3853 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3854 | "} := uint27_clock_monotonic_t;\n" |
3855 | "\n" | |
3856 | "typealias integer {\n" | |
3857 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3858 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3859 | "} := uint32_clock_monotonic_t;\n" |
3860 | "\n" | |
3861 | "typealias integer {\n" | |
3862 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3863 | " map = clock.%s.value;\n" |
a3ccff4f | 3864 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3865 | trace_clock_name(), |
a3ccff4f | 3866 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3867 | trace_clock_name(), |
3868 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3869 | trace_clock_name() | |
a3ccff4f MD |
3870 | ); |
3871 | if (ret) | |
3872 | goto end; | |
3873 | ||
a90917c3 | 3874 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3875 | if (ret) |
3876 | goto end; | |
3877 | ||
a90917c3 | 3878 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3879 | if (ret) |
3880 | goto end; | |
3881 | ||
c099397a MD |
3882 | skip_session: |
3883 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3884 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3885 | if (ret) |
3886 | goto end; | |
3887 | } | |
3888 | ||
3889 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3890 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3891 | if (ret) |
3892 | goto end; | |
3893 | } | |
3894 | session->metadata_dumped = 1; | |
3895 | end: | |
8b97fd42 | 3896 | lttng_metadata_end(session); |
c099397a MD |
3897 | return ret; |
3898 | } | |
3899 | ||
c0e31d2e | 3900 | /** |
a90917c3 | 3901 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3902 | * @transport: transport structure |
3903 | * | |
3904 | * Registers a transport which can be used as output to extract the data out of | |
3905 | * LTTng. The module calling this registration function must ensure that no | |
3906 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3907 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3908 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3909 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3910 | * after its registration must it synchronize the TLBs. |
3911 | */ | |
a90917c3 | 3912 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3913 | { |
3914 | /* | |
3915 | * Make sure no page fault can be triggered by the module about to be | |
3916 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3917 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3918 | */ |
263b6c88 | 3919 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3920 | |
3921 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3922 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3923 | mutex_unlock(&sessions_mutex); |
3924 | } | |
a90917c3 | 3925 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3926 | |
3927 | /** | |
a90917c3 | 3928 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3929 | * @transport: transport structure |
3930 | */ | |
a90917c3 | 3931 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3932 | { |
3933 | mutex_lock(&sessions_mutex); | |
3934 | list_del(&transport->node); | |
3935 | mutex_unlock(&sessions_mutex); | |
3936 | } | |
a90917c3 | 3937 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3938 | |
4442bc1b JR |
3939 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
3940 | { | |
3941 | /* | |
3942 | * Make sure no page fault can be triggered by the module about to be | |
3943 | * registered. We deal with this here so we don't have to call | |
3944 | * vmalloc_sync_mappings() in each module's init. | |
3945 | */ | |
3946 | wrapper_vmalloc_sync_mappings(); | |
3947 | ||
3948 | mutex_lock(&sessions_mutex); | |
3949 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
3950 | mutex_unlock(&sessions_mutex); | |
3951 | } | |
3952 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
3953 | ||
3954 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
3955 | { | |
3956 | mutex_lock(&sessions_mutex); | |
3957 | list_del(&transport->node); | |
3958 | mutex_unlock(&sessions_mutex); | |
3959 | } | |
3960 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
3961 | ||
894ce5dc | 3962 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3963 | |
3964 | enum cpuhp_state lttng_hp_prepare; | |
3965 | enum cpuhp_state lttng_hp_online; | |
3966 | ||
3967 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3968 | { | |
3969 | struct lttng_cpuhp_node *lttng_node; | |
3970 | ||
3971 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3972 | switch (lttng_node->component) { | |
3973 | case LTTNG_RING_BUFFER_FRONTEND: | |
3974 | return 0; | |
3975 | case LTTNG_RING_BUFFER_BACKEND: | |
3976 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3977 | case LTTNG_RING_BUFFER_ITER: | |
3978 | return 0; | |
3979 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3980 | return 0; | |
3981 | default: | |
3982 | return -EINVAL; | |
3983 | } | |
3984 | } | |
3985 | ||
3986 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3987 | { | |
3988 | struct lttng_cpuhp_node *lttng_node; | |
3989 | ||
3990 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3991 | switch (lttng_node->component) { | |
3992 | case LTTNG_RING_BUFFER_FRONTEND: | |
3993 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3994 | case LTTNG_RING_BUFFER_BACKEND: | |
3995 | return 0; | |
3996 | case LTTNG_RING_BUFFER_ITER: | |
3997 | return 0; | |
3998 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3999 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4000 | default: | |
4001 | return -EINVAL; | |
4002 | } | |
4003 | } | |
4004 | ||
4005 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4006 | { | |
4007 | struct lttng_cpuhp_node *lttng_node; | |
4008 | ||
4009 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4010 | switch (lttng_node->component) { | |
4011 | case LTTNG_RING_BUFFER_FRONTEND: | |
4012 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4013 | case LTTNG_RING_BUFFER_BACKEND: | |
4014 | return 0; | |
4015 | case LTTNG_RING_BUFFER_ITER: | |
4016 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4017 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4018 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4019 | default: | |
4020 | return -EINVAL; | |
4021 | } | |
4022 | } | |
4023 | ||
4024 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4025 | { | |
4026 | struct lttng_cpuhp_node *lttng_node; | |
4027 | ||
4028 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4029 | switch (lttng_node->component) { | |
4030 | case LTTNG_RING_BUFFER_FRONTEND: | |
4031 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4032 | case LTTNG_RING_BUFFER_BACKEND: | |
4033 | return 0; | |
4034 | case LTTNG_RING_BUFFER_ITER: | |
4035 | return 0; | |
4036 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4037 | return 0; | |
4038 | default: | |
4039 | return -EINVAL; | |
4040 | } | |
4041 | } | |
4042 | ||
4043 | static int __init lttng_init_cpu_hotplug(void) | |
4044 | { | |
4045 | int ret; | |
4046 | ||
4047 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4048 | lttng_hotplug_prepare, | |
4049 | lttng_hotplug_dead); | |
4050 | if (ret < 0) { | |
4051 | return ret; | |
4052 | } | |
4053 | lttng_hp_prepare = ret; | |
4054 | lttng_rb_set_hp_prepare(ret); | |
4055 | ||
4056 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4057 | lttng_hotplug_online, | |
4058 | lttng_hotplug_offline); | |
4059 | if (ret < 0) { | |
4060 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4061 | lttng_hp_prepare = 0; | |
4062 | return ret; | |
4063 | } | |
4064 | lttng_hp_online = ret; | |
4065 | lttng_rb_set_hp_online(ret); | |
4066 | ||
4067 | return 0; | |
4068 | } | |
4069 | ||
4070 | static void __exit lttng_exit_cpu_hotplug(void) | |
4071 | { | |
4072 | lttng_rb_set_hp_online(0); | |
4073 | cpuhp_remove_multi_state(lttng_hp_online); | |
4074 | lttng_rb_set_hp_prepare(0); | |
4075 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4076 | } | |
4077 | ||
1ee63d8d | 4078 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4079 | static int lttng_init_cpu_hotplug(void) |
4080 | { | |
4081 | return 0; | |
4082 | } | |
4083 | static void lttng_exit_cpu_hotplug(void) | |
4084 | { | |
4085 | } | |
1ee63d8d | 4086 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4087 | |
4088 | ||
a90917c3 | 4089 | static int __init lttng_events_init(void) |
4e3c1b9b | 4090 | { |
1c25284c MD |
4091 | int ret; |
4092 | ||
453b2495 JD |
4093 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4094 | if (ret) | |
4095 | return ret; | |
389d7070 | 4096 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4097 | if (ret) |
4098 | return ret; | |
4099 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4100 | if (ret) |
4101 | return ret; | |
4102 | ret = lttng_probes_init(); | |
389d7070 MD |
4103 | if (ret) |
4104 | return ret; | |
07dfc1d0 | 4105 | ret = lttng_context_init(); |
20591cf7 MD |
4106 | if (ret) |
4107 | return ret; | |
07dfc1d0 MD |
4108 | ret = lttng_tracepoint_init(); |
4109 | if (ret) | |
4110 | goto error_tp; | |
a90917c3 | 4111 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4112 | if (!event_cache) { |
4113 | ret = -ENOMEM; | |
4442bc1b JR |
4114 | goto error_kmem_event; |
4115 | } | |
4116 | trigger_cache = KMEM_CACHE(lttng_trigger, 0); | |
4117 | if (!trigger_cache) { | |
4118 | ret = -ENOMEM; | |
4119 | goto error_kmem_trigger; | |
20591cf7 | 4120 | } |
80996790 | 4121 | ret = lttng_abi_init(); |
02119ee5 MD |
4122 | if (ret) |
4123 | goto error_abi; | |
0c956676 MD |
4124 | ret = lttng_logger_init(); |
4125 | if (ret) | |
4126 | goto error_logger; | |
1e367326 MD |
4127 | ret = lttng_init_cpu_hotplug(); |
4128 | if (ret) | |
4129 | goto error_hotplug; | |
101215b7 | 4130 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4131 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4132 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4133 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4134 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4135 | LTTNG_VERSION_NAME, |
4136 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4137 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4138 | #else | |
4139 | "", | |
4140 | #endif | |
4141 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4142 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4143 | #else | |
4144 | ""); | |
4145 | #endif | |
4e3c1b9b | 4146 | return 0; |
0c956676 | 4147 | |
1e367326 MD |
4148 | error_hotplug: |
4149 | lttng_logger_exit(); | |
0c956676 MD |
4150 | error_logger: |
4151 | lttng_abi_exit(); | |
02119ee5 | 4152 | error_abi: |
4442bc1b JR |
4153 | kmem_cache_destroy(trigger_cache); |
4154 | error_kmem_trigger: | |
1c25284c | 4155 | kmem_cache_destroy(event_cache); |
4442bc1b | 4156 | error_kmem_event: |
20591cf7 | 4157 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4158 | error_tp: |
4159 | lttng_context_exit(); | |
101215b7 | 4160 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4161 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4162 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4163 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4164 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4165 | LTTNG_VERSION_NAME, |
4166 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4167 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4168 | #else | |
4169 | "", | |
4170 | #endif | |
4171 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4172 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4173 | #else | |
4174 | ""); | |
4175 | #endif | |
1c25284c | 4176 | return ret; |
4e3c1b9b MD |
4177 | } |
4178 | ||
a90917c3 | 4179 | module_init(lttng_events_init); |
11b5a3c2 | 4180 | |
a90917c3 | 4181 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4182 | { |
a90917c3 | 4183 | struct lttng_session *session, *tmpsession; |
92e94819 | 4184 | |
1e367326 | 4185 | lttng_exit_cpu_hotplug(); |
0c956676 | 4186 | lttng_logger_exit(); |
80996790 | 4187 | lttng_abi_exit(); |
92e94819 | 4188 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4189 | lttng_session_destroy(session); |
11b5a3c2 | 4190 | kmem_cache_destroy(event_cache); |
4442bc1b | 4191 | kmem_cache_destroy(trigger_cache); |
20591cf7 | 4192 | lttng_tracepoint_exit(); |
07dfc1d0 | 4193 | lttng_context_exit(); |
101215b7 | 4194 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4195 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4196 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4197 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4198 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4199 | LTTNG_VERSION_NAME, |
4200 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4201 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4202 | #else | |
4203 | "", | |
4204 | #endif | |
4205 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4206 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4207 | #else | |
4208 | ""); | |
4209 | #endif | |
4e3c1b9b | 4210 | } |
92e94819 | 4211 | |
a90917c3 | 4212 | module_exit(lttng_events_exit); |
11b5a3c2 | 4213 | |
7ca11e77 | 4214 | #include <generated/patches.h> |
101215b7 MJ |
4215 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4216 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4217 | #endif | |
4218 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4219 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4220 | #endif | |
92e94819 MD |
4221 | MODULE_LICENSE("GPL and additional rights"); |
4222 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4223 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4224 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4225 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4226 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4227 | LTTNG_MODULES_EXTRAVERSION); |