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> | |
92bc1e23 | 39 | #include <lttng/events-internal.h> |
0b365677 | 40 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 41 | #include <lttng/tracer.h> |
21f58fb7 | 42 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
43 | #include <lttng/abi-old.h> |
44 | #include <lttng/endian.h> | |
45 | #include <lttng/string-utils.h> | |
4a11ef1c | 46 | #include <lttng/utils.h> |
24591303 MD |
47 | #include <ringbuffer/backend.h> |
48 | #include <ringbuffer/frontend.h> | |
3636085f | 49 | #include <wrapper/time.h> |
4e3c1b9b | 50 | |
d83004aa JD |
51 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
52 | ||
4e3c1b9b | 53 | static LIST_HEAD(sessions); |
750b05f2 | 54 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 55 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 56 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
57 | /* |
58 | * Protect the sessions and metadata caches. | |
59 | */ | |
4e3c1b9b MD |
60 | static DEFINE_MUTEX(sessions_mutex); |
61 | static struct kmem_cache *event_cache; | |
dffef45d | 62 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 63 | |
b2bc0bc8 FD |
64 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
65 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
66 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 67 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 68 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 69 | |
a90917c3 | 70 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 71 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
72 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
73 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 74 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 75 | static |
a90917c3 MD |
76 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
77 | struct lttng_channel *chan, | |
78 | struct lttng_event *event); | |
c099397a | 79 | static |
a90917c3 | 80 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 83 | static |
ceabb767 | 84 | int _lttng_type_statedump(struct lttng_session *session, |
437d5aa5 MD |
85 | const struct lttng_kernel_type_common *type, |
86 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
87 | size_t nesting); |
88 | static | |
f513b2bf | 89 | int _lttng_field_statedump(struct lttng_session *session, |
437d5aa5 | 90 | const struct lttng_kernel_event_field *field, |
f513b2bf | 91 | size_t nesting); |
c099397a | 92 | |
c099397a | 93 | void synchronize_trace(void) |
abcca994 | 94 | { |
5f4c791e | 95 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
96 | synchronize_rcu(); |
97 | #else | |
abcca994 | 98 | synchronize_sched(); |
92da05ce MJ |
99 | #endif |
100 | ||
5f4c791e | 101 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
102 | #ifdef CONFIG_PREEMPT_RT_FULL |
103 | synchronize_rcu(); | |
104 | #endif | |
5f4c791e | 105 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
106 | #ifdef CONFIG_PREEMPT_RT |
107 | synchronize_rcu(); | |
108 | #endif | |
5f4c791e | 109 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
110 | } |
111 | ||
3c997079 MD |
112 | void lttng_lock_sessions(void) |
113 | { | |
114 | mutex_lock(&sessions_mutex); | |
115 | } | |
116 | ||
117 | void lttng_unlock_sessions(void) | |
118 | { | |
119 | mutex_unlock(&sessions_mutex); | |
120 | } | |
121 | ||
9fe593d2 FD |
122 | static struct lttng_transport *lttng_transport_find(const char *name) |
123 | { | |
124 | struct lttng_transport *transport; | |
125 | ||
126 | list_for_each_entry(transport, <tng_transport_list, node) { | |
127 | if (!strcmp(transport->name, name)) | |
128 | return transport; | |
129 | } | |
130 | return NULL; | |
131 | } | |
132 | ||
3c997079 MD |
133 | /* |
134 | * Called with sessions lock held. | |
135 | */ | |
136 | int lttng_session_active(void) | |
137 | { | |
138 | struct lttng_session *iter; | |
139 | ||
140 | list_for_each_entry(iter, &sessions, list) { | |
141 | if (iter->active) | |
142 | return 1; | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
a90917c3 | 147 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 148 | { |
a90917c3 | 149 | struct lttng_session *session; |
d83004aa | 150 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 151 | int i; |
4e3c1b9b MD |
152 | |
153 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 154 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 155 | if (!session) |
d83004aa | 156 | goto err; |
4e3c1b9b | 157 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 158 | INIT_LIST_HEAD(&session->events); |
a7008254 | 159 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
160 | |
161 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
162 | GFP_KERNEL); | |
163 | if (!metadata_cache) | |
164 | goto err_free_session; | |
0ca42eb7 | 165 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
166 | if (!metadata_cache->data) |
167 | goto err_free_cache; | |
168 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
169 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 170 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
171 | session->metadata_cache = metadata_cache; |
172 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
173 | memcpy(&metadata_cache->uuid, &session->uuid, |
174 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
175 | INIT_LIST_HEAD(&session->enablers_head); |
176 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
177 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 178 | list_add(&session->list, &sessions); |
d1f652f8 MD |
179 | session->pid_tracker.session = session; |
180 | session->pid_tracker.tracker_type = TRACKER_PID; | |
181 | session->vpid_tracker.session = session; | |
182 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
183 | session->uid_tracker.session = session; | |
184 | session->uid_tracker.tracker_type = TRACKER_UID; | |
185 | session->vuid_tracker.session = session; | |
186 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
187 | session->gid_tracker.session = session; | |
188 | session->gid_tracker.tracker_type = TRACKER_GID; | |
189 | session->vgid_tracker.session = session; | |
190 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
191 | mutex_unlock(&sessions_mutex); |
192 | return session; | |
d83004aa JD |
193 | |
194 | err_free_cache: | |
195 | kfree(metadata_cache); | |
196 | err_free_session: | |
48f5e0b5 | 197 | lttng_kvfree(session); |
d83004aa JD |
198 | err: |
199 | mutex_unlock(&sessions_mutex); | |
200 | return NULL; | |
201 | } | |
202 | ||
99f52fcc FD |
203 | static |
204 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
205 | { | |
206 | struct lttng_counter_transport *transport; | |
207 | ||
208 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
209 | if (!strcmp(transport->name, name)) | |
210 | return transport; | |
211 | } | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | struct lttng_counter *lttng_kernel_counter_create( | |
216 | const char *counter_transport_name, | |
217 | size_t number_dimensions, const size_t *dimensions_sizes) | |
218 | { | |
219 | struct lttng_counter *counter = NULL; | |
220 | struct lttng_counter_transport *counter_transport = NULL; | |
221 | ||
222 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
223 | if (!counter_transport) { | |
224 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
225 | counter_transport_name); | |
226 | goto notransport; | |
227 | } | |
228 | if (!try_module_get(counter_transport->owner)) { | |
229 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
230 | goto notransport; | |
231 | } | |
232 | ||
233 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
234 | if (!counter) | |
235 | goto nomem; | |
236 | ||
237 | /* Create event notifier error counter. */ | |
238 | counter->ops = &counter_transport->ops; | |
239 | counter->transport = counter_transport; | |
240 | ||
241 | counter->counter = counter->ops->counter_create( | |
242 | number_dimensions, dimensions_sizes, 0); | |
243 | if (!counter->counter) { | |
244 | goto create_error; | |
245 | } | |
246 | ||
247 | return counter; | |
248 | ||
249 | create_error: | |
250 | lttng_kvfree(counter); | |
251 | nomem: | |
252 | if (counter_transport) | |
253 | module_put(counter_transport->owner); | |
254 | notransport: | |
255 | return NULL; | |
256 | } | |
257 | ||
750b05f2 FD |
258 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
259 | { | |
260 | struct lttng_transport *transport = NULL; | |
261 | struct lttng_event_notifier_group *event_notifier_group; | |
262 | const char *transport_name = "relay-event-notifier"; | |
263 | size_t subbuf_size = 4096; //TODO | |
264 | size_t num_subbuf = 16; //TODO | |
265 | unsigned int switch_timer_interval = 0; | |
266 | unsigned int read_timer_interval = 0; | |
dffef45d | 267 | int i; |
750b05f2 FD |
268 | |
269 | mutex_lock(&sessions_mutex); | |
270 | ||
271 | transport = lttng_transport_find(transport_name); | |
272 | if (!transport) { | |
273 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
274 | transport_name); | |
275 | goto notransport; | |
276 | } | |
277 | if (!try_module_get(transport->owner)) { | |
278 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
279 | transport_name); | |
280 | goto notransport; | |
281 | } | |
282 | ||
283 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
284 | GFP_KERNEL); | |
285 | if (!event_notifier_group) | |
286 | goto nomem; | |
287 | ||
288 | /* | |
289 | * Initialize the ring buffer used to store event notifier | |
290 | * notifications. | |
291 | */ | |
292 | event_notifier_group->ops = &transport->ops; | |
293 | event_notifier_group->chan = transport->ops.channel_create( | |
294 | transport_name, event_notifier_group, NULL, | |
295 | subbuf_size, num_subbuf, switch_timer_interval, | |
296 | read_timer_interval); | |
297 | if (!event_notifier_group->chan) | |
298 | goto create_error; | |
299 | ||
300 | event_notifier_group->transport = transport; | |
dffef45d FD |
301 | |
302 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
303 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
304 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
305 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
306 | ||
750b05f2 FD |
307 | list_add(&event_notifier_group->node, &event_notifier_groups); |
308 | ||
309 | mutex_unlock(&sessions_mutex); | |
310 | ||
311 | return event_notifier_group; | |
312 | ||
313 | create_error: | |
314 | lttng_kvfree(event_notifier_group); | |
315 | nomem: | |
316 | if (transport) | |
317 | module_put(transport->owner); | |
318 | notransport: | |
319 | mutex_unlock(&sessions_mutex); | |
320 | return NULL; | |
321 | } | |
322 | ||
d83004aa JD |
323 | void metadata_cache_destroy(struct kref *kref) |
324 | { | |
325 | struct lttng_metadata_cache *cache = | |
326 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 327 | vfree(cache->data); |
d83004aa | 328 | kfree(cache); |
4e3c1b9b MD |
329 | } |
330 | ||
a90917c3 | 331 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 332 | { |
a90917c3 MD |
333 | struct lttng_channel *chan, *tmpchan; |
334 | struct lttng_event *event, *tmpevent; | |
d83004aa | 335 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 336 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 337 | int ret; |
4e3c1b9b MD |
338 | |
339 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 340 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 341 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 342 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
343 | WARN_ON(ret); |
344 | } | |
dda6a249 | 345 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 346 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
347 | WARN_ON(ret); |
348 | } | |
abcca994 | 349 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 350 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 351 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
352 | WARN_ON(ret); |
353 | } | |
b2bc0bc8 | 354 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 355 | &session->enablers_head, node) |
b2bc0bc8 | 356 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 357 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 358 | _lttng_event_destroy(event); |
d83004aa JD |
359 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
360 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 361 | _lttng_channel_destroy(chan); |
d83004aa | 362 | } |
ab036a63 | 363 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
364 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
365 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 366 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
367 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
368 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
369 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
371 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
372 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 373 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
374 | list_del(&session->list); |
375 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 376 | lttng_kvfree(session); |
4e3c1b9b MD |
377 | } |
378 | ||
dffef45d FD |
379 | void lttng_event_notifier_group_destroy( |
380 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 381 | { |
dffef45d FD |
382 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
383 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
384 | int ret; | |
385 | ||
750b05f2 FD |
386 | if (!event_notifier_group) |
387 | return; | |
388 | ||
389 | mutex_lock(&sessions_mutex); | |
dffef45d | 390 | |
3b82c4e1 | 391 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
392 | WARN_ON(ret); |
393 | ||
dffef45d FD |
394 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
395 | &event_notifier_group->event_notifiers_head, list) { | |
396 | ret = _lttng_event_notifier_unregister(event_notifier); | |
397 | WARN_ON(ret); | |
398 | } | |
399 | ||
b01155ba FD |
400 | /* Wait for in-flight event notifier to complete */ |
401 | synchronize_trace(); | |
402 | ||
21f58fb7 FD |
403 | irq_work_sync(&event_notifier_group->wakeup_pending); |
404 | ||
8a8ac9a8 FD |
405 | kfree(event_notifier_group->sc_filter); |
406 | ||
dffef45d FD |
407 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
408 | &event_notifier_group->enablers_head, node) | |
409 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
410 | ||
411 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
412 | &event_notifier_group->event_notifiers_head, list) | |
413 | _lttng_event_notifier_destroy(event_notifier); | |
414 | ||
99f52fcc FD |
415 | if (event_notifier_group->error_counter) { |
416 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 417 | |
99f52fcc FD |
418 | error_counter->ops->counter_destroy(error_counter->counter); |
419 | module_put(error_counter->transport->owner); | |
420 | lttng_kvfree(error_counter); | |
421 | event_notifier_group->error_counter = NULL; | |
422 | } | |
423 | ||
750b05f2 FD |
424 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
425 | module_put(event_notifier_group->transport->owner); | |
426 | list_del(&event_notifier_group->node); | |
dffef45d | 427 | |
750b05f2 FD |
428 | mutex_unlock(&sessions_mutex); |
429 | lttng_kvfree(event_notifier_group); | |
430 | } | |
431 | ||
601252cf MD |
432 | int lttng_session_statedump(struct lttng_session *session) |
433 | { | |
434 | int ret; | |
435 | ||
436 | mutex_lock(&sessions_mutex); | |
437 | ret = lttng_statedump_start(session); | |
438 | mutex_unlock(&sessions_mutex); | |
439 | return ret; | |
440 | } | |
441 | ||
a90917c3 | 442 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
443 | { |
444 | int ret = 0; | |
a90917c3 | 445 | struct lttng_channel *chan; |
c0e31d2e MD |
446 | |
447 | mutex_lock(&sessions_mutex); | |
448 | if (session->active) { | |
449 | ret = -EBUSY; | |
450 | goto end; | |
451 | } | |
c099397a | 452 | |
3c997079 MD |
453 | /* Set transient enabler state to "enabled" */ |
454 | session->tstate = 1; | |
455 | ||
4ef81e4a | 456 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 457 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 458 | |
c099397a MD |
459 | /* |
460 | * Snapshot the number of events per channel to know the type of header | |
461 | * we need to use. | |
462 | */ | |
463 | list_for_each_entry(chan, &session->chan, list) { | |
464 | if (chan->header_type) | |
465 | continue; /* don't change it if session stop/restart */ | |
466 | if (chan->free_event_id < 31) | |
467 | chan->header_type = 1; /* compact */ | |
468 | else | |
469 | chan->header_type = 2; /* large */ | |
470 | } | |
471 | ||
64af2437 | 472 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
473 | list_for_each_entry(chan, &session->chan, list) { |
474 | if (chan->channel_type != METADATA_CHANNEL) | |
475 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
476 | } | |
64af2437 | 477 | |
a8f2d0c7 MJ |
478 | WRITE_ONCE(session->active, 1); |
479 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 480 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 481 | if (ret) { |
a8f2d0c7 | 482 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
483 | goto end; |
484 | } | |
485 | ret = lttng_statedump_start(session); | |
360f38ea | 486 | if (ret) |
a8f2d0c7 | 487 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
488 | end: |
489 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 490 | return ret; |
c0e31d2e MD |
491 | } |
492 | ||
a90917c3 | 493 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
494 | { |
495 | int ret = 0; | |
64af2437 | 496 | struct lttng_channel *chan; |
c0e31d2e MD |
497 | |
498 | mutex_lock(&sessions_mutex); | |
499 | if (!session->active) { | |
500 | ret = -EBUSY; | |
501 | goto end; | |
502 | } | |
a8f2d0c7 | 503 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
504 | |
505 | /* Set transient enabler state to "disabled" */ | |
506 | session->tstate = 0; | |
b2bc0bc8 | 507 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
508 | |
509 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
510 | list_for_each_entry(chan, &session->chan, list) { |
511 | if (chan->channel_type != METADATA_CHANNEL) | |
512 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
513 | } | |
c0e31d2e MD |
514 | end: |
515 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 516 | return ret; |
c0e31d2e MD |
517 | } |
518 | ||
9616f0bf JD |
519 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
520 | { | |
521 | int ret = 0; | |
522 | struct lttng_channel *chan; | |
523 | struct lttng_event *event; | |
524 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
525 | struct lttng_metadata_stream *stream; | |
526 | ||
527 | mutex_lock(&sessions_mutex); | |
528 | if (!session->active) { | |
529 | ret = -EBUSY; | |
530 | goto end; | |
531 | } | |
532 | ||
533 | mutex_lock(&cache->lock); | |
534 | memset(cache->data, 0, cache->cache_alloc); | |
535 | cache->metadata_written = 0; | |
536 | cache->version++; | |
537 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
538 | stream->metadata_out = 0; | |
539 | stream->metadata_in = 0; | |
540 | } | |
541 | mutex_unlock(&cache->lock); | |
542 | ||
543 | session->metadata_dumped = 0; | |
544 | list_for_each_entry(chan, &session->chan, list) { | |
545 | chan->metadata_dumped = 0; | |
546 | } | |
547 | ||
548 | list_for_each_entry(event, &session->events, list) { | |
549 | event->metadata_dumped = 0; | |
550 | } | |
551 | ||
552 | ret = _lttng_session_metadata_statedump(session); | |
553 | ||
554 | end: | |
555 | mutex_unlock(&sessions_mutex); | |
556 | return ret; | |
557 | } | |
558 | ||
a90917c3 | 559 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 560 | { |
3c997079 | 561 | int ret = 0; |
e64957da | 562 | |
3c997079 MD |
563 | mutex_lock(&sessions_mutex); |
564 | if (channel->channel_type == METADATA_CHANNEL) { | |
565 | ret = -EPERM; | |
566 | goto end; | |
567 | } | |
568 | if (channel->enabled) { | |
569 | ret = -EEXIST; | |
570 | goto end; | |
571 | } | |
572 | /* Set transient enabler state to "enabled" */ | |
573 | channel->tstate = 1; | |
b2bc0bc8 | 574 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 575 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 576 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
577 | end: |
578 | mutex_unlock(&sessions_mutex); | |
579 | return ret; | |
e64957da MD |
580 | } |
581 | ||
a90917c3 | 582 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 583 | { |
3c997079 | 584 | int ret = 0; |
e64957da | 585 | |
3c997079 MD |
586 | mutex_lock(&sessions_mutex); |
587 | if (channel->channel_type == METADATA_CHANNEL) { | |
588 | ret = -EPERM; | |
589 | goto end; | |
590 | } | |
591 | if (!channel->enabled) { | |
592 | ret = -EEXIST; | |
593 | goto end; | |
594 | } | |
595 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 596 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
597 | /* Set transient enabler state to "enabled" */ |
598 | channel->tstate = 0; | |
b2bc0bc8 | 599 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
600 | end: |
601 | mutex_unlock(&sessions_mutex); | |
602 | return ret; | |
e64957da MD |
603 | } |
604 | ||
a90917c3 | 605 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 606 | { |
3c997079 | 607 | int ret = 0; |
e64957da | 608 | |
3c997079 MD |
609 | mutex_lock(&sessions_mutex); |
610 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
611 | ret = -EPERM; | |
612 | goto end; | |
613 | } | |
614 | if (event->enabled) { | |
615 | ret = -EEXIST; | |
616 | goto end; | |
617 | } | |
a0493bef | 618 | switch (event->instrumentation) { |
b4a75708 | 619 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
620 | case LTTNG_KERNEL_SYSCALL: |
621 | ret = -EINVAL; | |
622 | break; | |
b4a75708 MD |
623 | |
624 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 625 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 626 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 627 | break; |
b4a75708 | 628 | |
a0493bef MD |
629 | case LTTNG_KERNEL_KRETPROBE: |
630 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
631 | break; | |
b4a75708 MD |
632 | |
633 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
634 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
635 | default: |
636 | WARN_ON_ONCE(1); | |
637 | ret = -EINVAL; | |
638 | } | |
3c997079 MD |
639 | end: |
640 | mutex_unlock(&sessions_mutex); | |
641 | return ret; | |
e64957da MD |
642 | } |
643 | ||
a90917c3 | 644 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 645 | { |
3c997079 | 646 | int ret = 0; |
e64957da | 647 | |
3c997079 MD |
648 | mutex_lock(&sessions_mutex); |
649 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
650 | ret = -EPERM; | |
651 | goto end; | |
652 | } | |
653 | if (!event->enabled) { | |
654 | ret = -EEXIST; | |
655 | goto end; | |
656 | } | |
a0493bef | 657 | switch (event->instrumentation) { |
b4a75708 | 658 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
659 | case LTTNG_KERNEL_SYSCALL: |
660 | ret = -EINVAL; | |
661 | break; | |
b4a75708 MD |
662 | |
663 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 664 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 665 | WRITE_ONCE(event->enabled, 0); |
a0493bef | 666 | break; |
b4a75708 | 667 | |
a0493bef | 668 | case LTTNG_KERNEL_KRETPROBE: |
b4a75708 | 669 | |
a0493bef MD |
670 | ret = lttng_kretprobes_event_enable_state(event, 0); |
671 | break; | |
b4a75708 MD |
672 | |
673 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
674 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
675 | default: |
676 | WARN_ON_ONCE(1); | |
677 | ret = -EINVAL; | |
678 | } | |
3c997079 MD |
679 | end: |
680 | mutex_unlock(&sessions_mutex); | |
681 | return ret; | |
e64957da MD |
682 | } |
683 | ||
dffef45d FD |
684 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
685 | { | |
686 | int ret = 0; | |
687 | ||
688 | mutex_lock(&sessions_mutex); | |
689 | if (event_notifier->enabled) { | |
690 | ret = -EEXIST; | |
691 | goto end; | |
692 | } | |
693 | switch (event_notifier->instrumentation) { | |
b4a75708 | 694 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 695 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
696 | ret = -EINVAL; |
697 | break; | |
b4a75708 MD |
698 | |
699 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 700 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
701 | WRITE_ONCE(event_notifier->enabled, 1); |
702 | break; | |
b4a75708 MD |
703 | |
704 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
705 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
706 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
707 | default: |
708 | WARN_ON_ONCE(1); | |
709 | ret = -EINVAL; | |
710 | } | |
711 | end: | |
712 | mutex_unlock(&sessions_mutex); | |
713 | return ret; | |
714 | } | |
715 | ||
716 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
717 | { | |
718 | int ret = 0; | |
719 | ||
720 | mutex_lock(&sessions_mutex); | |
721 | if (!event_notifier->enabled) { | |
722 | ret = -EEXIST; | |
723 | goto end; | |
724 | } | |
725 | switch (event_notifier->instrumentation) { | |
b4a75708 | 726 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 727 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
728 | ret = -EINVAL; |
729 | break; | |
b4a75708 MD |
730 | |
731 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 732 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
733 | WRITE_ONCE(event_notifier->enabled, 0); |
734 | break; | |
b4a75708 MD |
735 | |
736 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
737 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
738 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
739 | default: |
740 | WARN_ON_ONCE(1); | |
741 | ret = -EINVAL; | |
742 | } | |
743 | end: | |
744 | mutex_unlock(&sessions_mutex); | |
745 | return ret; | |
746 | } | |
747 | ||
a90917c3 | 748 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
749 | const char *transport_name, |
750 | void *buf_addr, | |
4e3c1b9b MD |
751 | size_t subbuf_size, size_t num_subbuf, |
752 | unsigned int switch_timer_interval, | |
d83004aa JD |
753 | unsigned int read_timer_interval, |
754 | enum channel_type channel_type) | |
4e3c1b9b | 755 | { |
a90917c3 MD |
756 | struct lttng_channel *chan; |
757 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
758 | |
759 | mutex_lock(&sessions_mutex); | |
d83004aa | 760 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 761 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 762 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 763 | if (!transport) { |
5a15f70c | 764 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 765 | transport_name); |
c0e31d2e | 766 | goto notransport; |
f3d01b96 | 767 | } |
a33c9927 | 768 | if (!try_module_get(transport->owner)) { |
5a15f70c | 769 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
770 | goto notransport; |
771 | } | |
a90917c3 | 772 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 773 | if (!chan) |
c0e31d2e | 774 | goto nomem; |
4e3c1b9b | 775 | chan->session = session; |
05d32c64 | 776 | chan->id = session->free_chan_id++; |
3b731ab1 | 777 | chan->ops = &transport->ops; |
125b4df4 MD |
778 | /* |
779 | * Note: the channel creation op already writes into the packet | |
780 | * headers. Therefore the "chan" information used as input | |
781 | * should be already accessible. | |
782 | */ | |
5f5ddf01 MD |
783 | chan->chan = transport->ops.channel_create(transport_name, |
784 | chan, buf_addr, subbuf_size, num_subbuf, | |
785 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
786 | if (!chan->chan) |
787 | goto create_error; | |
3c997079 | 788 | chan->tstate = 1; |
e64957da | 789 | chan->enabled = 1; |
a33c9927 | 790 | chan->transport = transport; |
d83004aa | 791 | chan->channel_type = channel_type; |
4e3c1b9b MD |
792 | list_add(&chan->list, &session->chan); |
793 | mutex_unlock(&sessions_mutex); | |
794 | return chan; | |
795 | ||
f3d01b96 MD |
796 | create_error: |
797 | kfree(chan); | |
c0e31d2e | 798 | nomem: |
a33c9927 MD |
799 | if (transport) |
800 | module_put(transport->owner); | |
c0e31d2e | 801 | notransport: |
e5382b6d | 802 | active: |
4e3c1b9b MD |
803 | mutex_unlock(&sessions_mutex); |
804 | return NULL; | |
805 | } | |
806 | ||
807 | /* | |
d83004aa JD |
808 | * Only used internally at session destruction for per-cpu channels, and |
809 | * when metadata channel is released. | |
810 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 811 | */ |
aa7c23a9 | 812 | static |
a90917c3 | 813 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 814 | { |
11b5a3c2 | 815 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 816 | module_put(chan->transport->owner); |
4e3c1b9b | 817 | list_del(&chan->list); |
437d5aa5 | 818 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
819 | kfree(chan); |
820 | } | |
821 | ||
d83004aa JD |
822 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
823 | { | |
824 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
825 | ||
826 | /* Protect the metadata cache with the sessions_mutex. */ | |
827 | mutex_lock(&sessions_mutex); | |
828 | _lttng_channel_destroy(chan); | |
829 | mutex_unlock(&sessions_mutex); | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
832 | ||
833 | static | |
834 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
835 | { | |
836 | stream->finalized = 1; | |
837 | wake_up_interruptible(&stream->read_wait); | |
838 | } | |
839 | ||
a101fa10 | 840 | |
e5382b6d MD |
841 | /* |
842 | * Supports event creation while tracing session is active. | |
3c997079 | 843 | * Needs to be called with sessions mutex held. |
e5382b6d | 844 | */ |
3c997079 MD |
845 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
846 | struct lttng_kernel_event *event_param, | |
847 | void *filter, | |
437d5aa5 | 848 | const struct lttng_kernel_event_desc *event_desc, |
3c997079 | 849 | enum lttng_kernel_instrumentation itype) |
4e3c1b9b | 850 | { |
3c997079 | 851 | struct lttng_session *session = chan->session; |
a90917c3 | 852 | struct lttng_event *event; |
3c997079 MD |
853 | const char *event_name; |
854 | struct hlist_head *head; | |
3d084699 | 855 | int ret; |
4e3c1b9b | 856 | |
abc0446a | 857 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 858 | ret = -EMFILE; |
e5382b6d | 859 | goto full; |
abc0446a | 860 | } |
3c997079 MD |
861 | |
862 | switch (itype) { | |
863 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 864 | event_name = event_desc->event_name; |
3c997079 | 865 | break; |
b4a75708 MD |
866 | |
867 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
868 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
869 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
33a39a3c | 870 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
871 | event_name = event_param->name; |
872 | break; | |
b4a75708 MD |
873 | |
874 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
875 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
3c997079 MD |
876 | default: |
877 | WARN_ON_ONCE(1); | |
878 | ret = -EINVAL; | |
879 | goto type_error; | |
880 | } | |
4a11ef1c FD |
881 | |
882 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
883 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 884 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 885 | WARN_ON_ONCE(!event->desc); |
437d5aa5 | 886 | if (!strncmp(event->desc->event_name, event_name, |
3c997079 MD |
887 | LTTNG_KERNEL_SYM_NAME_LEN - 1) |
888 | && chan == event->chan) { | |
889 | ret = -EEXIST; | |
890 | goto exist; | |
abc0446a MD |
891 | } |
892 | } | |
3c997079 | 893 | |
11b5a3c2 | 894 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 895 | if (!event) { |
4cf0bf51 | 896 | ret = -ENOMEM; |
4e3c1b9b | 897 | goto cache_error; |
abc0446a | 898 | } |
4e3c1b9b MD |
899 | event->chan = chan; |
900 | event->filter = filter; | |
e5382b6d | 901 | event->id = chan->free_event_id++; |
3c997079 MD |
902 | event->instrumentation = itype; |
903 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 904 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
905 | INIT_LIST_HEAD(&event->enablers_ref_head); |
906 | ||
907 | switch (itype) { | |
ab2277d6 | 908 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
909 | /* Event will be enabled by enabler sync. */ |
910 | event->enabled = 0; | |
911 | event->registered = 0; | |
0bcedee9 | 912 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 913 | if (!event->desc) { |
4cf0bf51 | 914 | ret = -ENOENT; |
d3dbe23c | 915 | goto register_error; |
abc0446a | 916 | } |
3c997079 MD |
917 | /* Populate lttng_event structure before event registration. */ |
918 | smp_wmb(); | |
baf20995 | 919 | break; |
b4a75708 | 920 | |
ab2277d6 | 921 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
922 | /* |
923 | * Needs to be explicitly enabled after creation, since | |
924 | * we may want to apply filters. | |
925 | */ | |
926 | event->enabled = 0; | |
3c997079 MD |
927 | event->registered = 1; |
928 | /* | |
929 | * Populate lttng_event structure before event | |
930 | * registration. | |
931 | */ | |
932 | smp_wmb(); | |
8bf17deb | 933 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
934 | event_param->u.kprobe.symbol_name, |
935 | event_param->u.kprobe.offset, | |
936 | event_param->u.kprobe.addr, | |
937 | event); | |
abc0446a | 938 | if (ret) { |
4cf0bf51 | 939 | ret = -EINVAL; |
d6d808f3 | 940 | goto register_error; |
abc0446a | 941 | } |
edeb3137 MD |
942 | ret = try_module_get(event->desc->owner); |
943 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 944 | break; |
b4a75708 | 945 | |
7371f44c MD |
946 | case LTTNG_KERNEL_KRETPROBE: |
947 | { | |
a90917c3 | 948 | struct lttng_event *event_return; |
7371f44c MD |
949 | |
950 | /* kretprobe defines 2 events */ | |
a0493bef MD |
951 | /* |
952 | * Needs to be explicitly enabled after creation, since | |
953 | * we may want to apply filters. | |
954 | */ | |
955 | event->enabled = 0; | |
3c997079 | 956 | event->registered = 1; |
7371f44c MD |
957 | event_return = |
958 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 959 | if (!event_return) { |
4cf0bf51 | 960 | ret = -ENOMEM; |
7371f44c | 961 | goto register_error; |
abc0446a | 962 | } |
7371f44c MD |
963 | event_return->chan = chan; |
964 | event_return->filter = filter; | |
965 | event_return->id = chan->free_event_id++; | |
a0493bef | 966 | event_return->enabled = 0; |
3c997079 MD |
967 | event_return->registered = 1; |
968 | event_return->instrumentation = itype; | |
484ec217 FD |
969 | INIT_LIST_HEAD(&event_return->filter_bytecode_runtime_head); |
970 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
7371f44c | 971 | /* |
a90917c3 | 972 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
973 | */ |
974 | smp_wmb(); | |
3c997079 | 975 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
976 | event_param->u.kretprobe.symbol_name, |
977 | event_param->u.kretprobe.offset, | |
978 | event_param->u.kretprobe.addr, | |
979 | event, event_return); | |
980 | if (ret) { | |
981 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 982 | ret = -EINVAL; |
7371f44c MD |
983 | goto register_error; |
984 | } | |
985 | /* Take 2 refs on the module: one per event. */ | |
986 | ret = try_module_get(event->desc->owner); | |
987 | WARN_ON_ONCE(!ret); | |
988 | ret = try_module_get(event->desc->owner); | |
989 | WARN_ON_ONCE(!ret); | |
a90917c3 | 990 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 991 | event_return); |
abc0446a | 992 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
993 | if (ret) { |
994 | kmem_cache_free(event_cache, event_return); | |
995 | module_put(event->desc->owner); | |
996 | module_put(event->desc->owner); | |
997 | goto statedump_error; | |
998 | } | |
999 | list_add(&event_return->list, &chan->session->events); | |
1000 | break; | |
1001 | } | |
b4a75708 | 1002 | |
33a39a3c | 1003 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
1004 | /* |
1005 | * Needs to be explicitly enabled after creation, since | |
1006 | * we may want to apply filters. | |
1007 | */ | |
1008 | event->enabled = 0; | |
3c997079 MD |
1009 | event->registered = 0; |
1010 | event->desc = event_desc; | |
badfe9f5 MD |
1011 | switch (event_param->u.syscall.entryexit) { |
1012 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1013 | ret = -EINVAL; | |
1014 | goto register_error; | |
1015 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1016 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1017 | break; | |
1018 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1019 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1020 | break; | |
1021 | } | |
1022 | switch (event_param->u.syscall.abi) { | |
1023 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1024 | ret = -EINVAL; | |
1025 | goto register_error; | |
1026 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1027 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1028 | break; | |
1029 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1030 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1031 | break; | |
1032 | } | |
abc0446a | 1033 | if (!event->desc) { |
4cf0bf51 | 1034 | ret = -EINVAL; |
259b6cb3 | 1035 | goto register_error; |
abc0446a | 1036 | } |
1ec65de1 | 1037 | break; |
b4a75708 | 1038 | |
149b9a9d | 1039 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1040 | /* |
1041 | * Needs to be explicitly enabled after creation, since | |
1042 | * we may want to apply filters. | |
1043 | */ | |
1044 | event->enabled = 0; | |
1045 | event->registered = 1; | |
3aed4dca | 1046 | |
a344f64b FD |
1047 | /* |
1048 | * Populate lttng_event structure before event | |
1049 | * registration. | |
1050 | */ | |
1051 | smp_wmb(); | |
149b9a9d | 1052 | |
83b802dc | 1053 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1054 | event_param->u.uprobe.fd, |
149b9a9d YB |
1055 | event); |
1056 | if (ret) | |
1057 | goto register_error; | |
1058 | ret = try_module_get(event->desc->owner); | |
1059 | WARN_ON_ONCE(!ret); | |
1060 | break; | |
b4a75708 | 1061 | |
e884017c | 1062 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1063 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
baf20995 MD |
1064 | default: |
1065 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1066 | ret = -EINVAL; |
df07930b | 1067 | goto register_error; |
baf20995 | 1068 | } |
a90917c3 | 1069 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
1070 | WARN_ON_ONCE(ret > 0); |
1071 | if (ret) { | |
c099397a | 1072 | goto statedump_error; |
abc0446a | 1073 | } |
3c997079 | 1074 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1075 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1076 | return event; |
1077 | ||
c099397a | 1078 | statedump_error: |
259b6cb3 | 1079 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1080 | register_error: |
11b5a3c2 | 1081 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1082 | cache_error: |
1083 | exist: | |
3c997079 | 1084 | type_error: |
e5382b6d | 1085 | full: |
4cf0bf51 | 1086 | return ERR_PTR(ret); |
4e3c1b9b MD |
1087 | } |
1088 | ||
dffef45d | 1089 | struct lttng_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1090 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1091 | uint64_t token, uint64_t error_counter_index, |
1092 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1093 | struct lttng_kernel_event_notifier *event_notifier_param, |
1094 | void *filter, enum lttng_kernel_instrumentation itype) | |
1095 | { | |
1096 | struct lttng_event_notifier *event_notifier; | |
ab04d7b1 | 1097 | struct lttng_counter *error_counter; |
dffef45d FD |
1098 | const char *event_name; |
1099 | struct hlist_head *head; | |
1100 | int ret; | |
1101 | ||
1102 | switch (itype) { | |
1103 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 1104 | event_name = event_desc->event_name; |
b01155ba | 1105 | break; |
b4a75708 MD |
1106 | |
1107 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1108 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
8a8ac9a8 | 1109 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1110 | event_name = event_notifier_param->event.name; |
1111 | break; | |
b4a75708 MD |
1112 | |
1113 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1114 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1115 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1116 | default: |
1117 | WARN_ON_ONCE(1); | |
1118 | ret = -EINVAL; | |
1119 | goto type_error; | |
1120 | } | |
1121 | ||
1122 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1123 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1124 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1125 | WARN_ON_ONCE(!event_notifier->desc); | |
437d5aa5 | 1126 | if (!strncmp(event_notifier->desc->event_name, event_name, |
dffef45d FD |
1127 | LTTNG_KERNEL_SYM_NAME_LEN - 1) |
1128 | && event_notifier_group == event_notifier->group | |
1129 | && token == event_notifier->user_token) { | |
1130 | ret = -EEXIST; | |
1131 | goto exist; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1136 | if (!event_notifier) { | |
1137 | ret = -ENOMEM; | |
1138 | goto cache_error; | |
1139 | } | |
21f58fb7 | 1140 | |
dffef45d FD |
1141 | event_notifier->group = event_notifier_group; |
1142 | event_notifier->user_token = token; | |
99f52fcc | 1143 | event_notifier->error_counter_index = error_counter_index; |
99d223ad | 1144 | event_notifier->num_captures = 0; |
dffef45d FD |
1145 | event_notifier->filter = filter; |
1146 | event_notifier->instrumentation = itype; | |
1147 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1148 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1149 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1150 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1151 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1152 | ||
1153 | switch (itype) { | |
1154 | case LTTNG_KERNEL_TRACEPOINT: | |
1155 | /* Event will be enabled by enabler sync. */ | |
1156 | event_notifier->enabled = 0; | |
1157 | event_notifier->registered = 0; | |
1158 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1159 | if (!event_notifier->desc) { | |
1160 | ret = -ENOENT; | |
1161 | goto register_error; | |
1162 | } | |
1163 | /* Populate lttng_event_notifier structure before event registration. */ | |
1164 | smp_wmb(); | |
1165 | break; | |
b4a75708 | 1166 | |
dffef45d | 1167 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1168 | /* |
1169 | * Needs to be explicitly enabled after creation, since | |
1170 | * we may want to apply filters. | |
1171 | */ | |
1172 | event_notifier->enabled = 0; | |
1173 | event_notifier->registered = 1; | |
1174 | /* | |
1175 | * Populate lttng_event_notifier structure before event | |
1176 | * registration. | |
1177 | */ | |
1178 | smp_wmb(); | |
1179 | ret = lttng_kprobes_register_event_notifier( | |
1180 | event_notifier_param->event.u.kprobe.symbol_name, | |
1181 | event_notifier_param->event.u.kprobe.offset, | |
1182 | event_notifier_param->event.u.kprobe.addr, | |
1183 | event_notifier); | |
1184 | if (ret) { | |
1185 | ret = -EINVAL; | |
1186 | goto register_error; | |
1187 | } | |
1188 | ret = try_module_get(event_notifier->desc->owner); | |
1189 | WARN_ON_ONCE(!ret); | |
1190 | break; | |
b4a75708 | 1191 | |
8a8ac9a8 FD |
1192 | case LTTNG_KERNEL_SYSCALL: |
1193 | /* | |
1194 | * Needs to be explicitly enabled after creation, since | |
1195 | * we may want to apply filters. | |
1196 | */ | |
1197 | event_notifier->enabled = 0; | |
1198 | event_notifier->registered = 0; | |
1199 | event_notifier->desc = event_desc; | |
1200 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1201 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1202 | ret = -EINVAL; | |
1203 | goto register_error; | |
1204 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1205 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1206 | break; | |
1207 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1208 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1209 | break; | |
1210 | } | |
1211 | switch (event_notifier_param->event.u.syscall.abi) { | |
1212 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1213 | ret = -EINVAL; | |
1214 | goto register_error; | |
1215 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1216 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1217 | break; | |
1218 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1219 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1220 | break; | |
1221 | } | |
1222 | ||
1223 | if (!event_notifier->desc) { | |
1224 | ret = -EINVAL; | |
1225 | goto register_error; | |
1226 | } | |
1227 | break; | |
b4a75708 | 1228 | |
dffef45d | 1229 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1230 | /* |
1231 | * Needs to be explicitly enabled after creation, since | |
1232 | * we may want to apply filters. | |
1233 | */ | |
1234 | event_notifier->enabled = 0; | |
1235 | event_notifier->registered = 1; | |
1236 | ||
1237 | /* | |
1238 | * Populate lttng_event_notifier structure before | |
1239 | * event_notifier registration. | |
1240 | */ | |
1241 | smp_wmb(); | |
1242 | ||
1243 | ret = lttng_uprobes_register_event_notifier( | |
1244 | event_notifier_param->event.name, | |
1245 | event_notifier_param->event.u.uprobe.fd, | |
1246 | event_notifier); | |
1247 | if (ret) | |
1248 | goto register_error; | |
1249 | ret = try_module_get(event_notifier->desc->owner); | |
1250 | WARN_ON_ONCE(!ret); | |
1251 | break; | |
b4a75708 MD |
1252 | |
1253 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1254 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1255 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1256 | default: |
1257 | WARN_ON_ONCE(1); | |
1258 | ret = -EINVAL; | |
1259 | goto register_error; | |
1260 | } | |
1261 | ||
1262 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1263 | hlist_add_head(&event_notifier->hlist, head); | |
99f52fcc FD |
1264 | |
1265 | /* | |
1266 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1267 | * bucket is currently in use. We trust it. The session lock |
1268 | * synchronizes against concurrent creation of the error | |
1269 | * counter. | |
99f52fcc | 1270 | */ |
ab04d7b1 MD |
1271 | error_counter = event_notifier_group->error_counter; |
1272 | if (error_counter) { | |
99f52fcc FD |
1273 | size_t dimension_index[1]; |
1274 | ||
1275 | /* | |
1276 | * Check that the index is within the boundary of the counter. | |
1277 | */ | |
1278 | if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) { | |
1279 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1280 | event_notifier_group->error_counter_len, event_notifier->error_counter_index); | |
1281 | ret = -EINVAL; | |
1282 | goto register_error; | |
1283 | } | |
1284 | ||
1285 | dimension_index[0] = event_notifier->error_counter_index; | |
ab04d7b1 | 1286 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1287 | if (ret) { |
1288 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1289 | event_notifier->error_counter_index); | |
1290 | goto register_error; | |
1291 | } | |
1292 | } | |
1293 | ||
dffef45d FD |
1294 | return event_notifier; |
1295 | ||
1296 | register_error: | |
1297 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1298 | cache_error: | |
1299 | exist: | |
1300 | type_error: | |
1301 | return ERR_PTR(ret); | |
1302 | } | |
1303 | ||
99f52fcc FD |
1304 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1305 | const size_t *dim_indexes, int32_t cpu, | |
1306 | int64_t *val, bool *overflow, bool *underflow) | |
1307 | { | |
1308 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1309 | cpu, val, overflow, underflow); | |
1310 | } | |
1311 | ||
1312 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1313 | const size_t *dim_indexes, int64_t *val, | |
1314 | bool *overflow, bool *underflow) | |
1315 | { | |
1316 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1317 | val, overflow, underflow); | |
1318 | } | |
1319 | ||
1320 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1321 | const size_t *dim_indexes) | |
1322 | { | |
1323 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1324 | } | |
1325 | ||
3c997079 MD |
1326 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1327 | struct lttng_kernel_event *event_param, | |
1328 | void *filter, | |
437d5aa5 | 1329 | const struct lttng_kernel_event_desc *event_desc, |
3c997079 MD |
1330 | enum lttng_kernel_instrumentation itype) |
1331 | { | |
1332 | struct lttng_event *event; | |
1333 | ||
1334 | mutex_lock(&sessions_mutex); | |
1335 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1336 | itype); | |
1337 | mutex_unlock(&sessions_mutex); | |
1338 | return event; | |
1339 | } | |
1340 | ||
dffef45d | 1341 | struct lttng_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1342 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1343 | uint64_t id, uint64_t error_counter_index, |
1344 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1345 | struct lttng_kernel_event_notifier *event_notifier_param, |
1346 | void *filter, enum lttng_kernel_instrumentation itype) | |
1347 | { | |
1348 | struct lttng_event_notifier *event_notifier; | |
1349 | ||
1350 | mutex_lock(&sessions_mutex); | |
1351 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc FD |
1352 | error_counter_index, event_notifier_group, |
1353 | event_notifier_param, filter, itype); | |
dffef45d FD |
1354 | mutex_unlock(&sessions_mutex); |
1355 | return event_notifier; | |
1356 | } | |
1357 | ||
3c997079 MD |
1358 | /* Only used for tracepoints for now. */ |
1359 | static | |
1360 | void register_event(struct lttng_event *event) | |
1361 | { | |
437d5aa5 | 1362 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1363 | int ret = -EINVAL; |
3c997079 | 1364 | |
3c997079 MD |
1365 | if (event->registered) |
1366 | return; | |
4ecb5ad5 | 1367 | |
3c997079 | 1368 | desc = event->desc; |
4ecb5ad5 MD |
1369 | switch (event->instrumentation) { |
1370 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 1371 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 MD |
1372 | desc->probe_callback, |
1373 | event); | |
1374 | break; | |
b4a75708 | 1375 | |
4ecb5ad5 | 1376 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1377 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 | 1378 | break; |
b4a75708 MD |
1379 | |
1380 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1381 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
4ecb5ad5 | 1382 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1383 | ret = 0; |
1384 | break; | |
b4a75708 | 1385 | |
e884017c | 1386 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1387 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
4ecb5ad5 MD |
1388 | default: |
1389 | WARN_ON_ONCE(1); | |
1390 | } | |
3c997079 MD |
1391 | if (!ret) |
1392 | event->registered = 1; | |
1393 | } | |
1394 | ||
4e3c1b9b MD |
1395 | /* |
1396 | * Only used internally at session destruction. | |
1397 | */ | |
a90917c3 | 1398 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1399 | { |
437d5aa5 | 1400 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1401 | int ret = -EINVAL; |
1402 | ||
3c997079 MD |
1403 | if (!event->registered) |
1404 | return 0; | |
1405 | ||
4ecb5ad5 | 1406 | desc = event->desc; |
38d024ae | 1407 | switch (event->instrumentation) { |
ab2277d6 | 1408 | case LTTNG_KERNEL_TRACEPOINT: |
437d5aa5 | 1409 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->event_kname, |
85a9ca7f | 1410 | event->desc->probe_callback, |
11b5a3c2 | 1411 | event); |
baf20995 | 1412 | break; |
b4a75708 | 1413 | |
ab2277d6 | 1414 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1415 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1416 | ret = 0; |
1417 | break; | |
b4a75708 | 1418 | |
7371f44c MD |
1419 | case LTTNG_KERNEL_KRETPROBE: |
1420 | lttng_kretprobes_unregister(event); | |
1421 | ret = 0; | |
1422 | break; | |
b4a75708 | 1423 | |
33a39a3c | 1424 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1425 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 | 1426 | break; |
b4a75708 | 1427 | |
4ecb5ad5 | 1428 | case LTTNG_KERNEL_NOOP: |
259b6cb3 MD |
1429 | ret = 0; |
1430 | break; | |
b4a75708 | 1431 | |
149b9a9d | 1432 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1433 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1434 | ret = 0; |
1435 | break; | |
b4a75708 | 1436 | |
e884017c | 1437 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1438 | default: |
1439 | WARN_ON_ONCE(1); | |
1440 | } | |
3c997079 MD |
1441 | if (!ret) |
1442 | event->registered = 0; | |
dda6a249 MD |
1443 | return ret; |
1444 | } | |
1445 | ||
dffef45d FD |
1446 | /* Only used for tracepoints for now. */ |
1447 | static | |
b01155ba | 1448 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d | 1449 | { |
437d5aa5 | 1450 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1451 | int ret = -EINVAL; |
1452 | ||
1453 | if (event_notifier->registered) | |
1454 | return; | |
1455 | ||
1456 | desc = event_notifier->desc; | |
1457 | switch (event_notifier->instrumentation) { | |
1458 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 1459 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
b01155ba FD |
1460 | desc->event_notifier_callback, |
1461 | event_notifier); | |
1462 | break; | |
b4a75708 | 1463 | |
8a8ac9a8 FD |
1464 | case LTTNG_KERNEL_SYSCALL: |
1465 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1466 | break; | |
b4a75708 MD |
1467 | |
1468 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 1469 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1470 | ret = 0; |
1471 | break; | |
b4a75708 MD |
1472 | |
1473 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1474 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1475 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1476 | default: |
1477 | WARN_ON_ONCE(1); | |
1478 | } | |
1479 | if (!ret) | |
1480 | event_notifier->registered = 1; | |
1481 | } | |
1482 | ||
1483 | static | |
1484 | int _lttng_event_notifier_unregister( | |
1485 | struct lttng_event_notifier *event_notifier) | |
1486 | { | |
437d5aa5 | 1487 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1488 | int ret = -EINVAL; |
1489 | ||
1490 | if (!event_notifier->registered) | |
1491 | return 0; | |
1492 | ||
1493 | desc = event_notifier->desc; | |
1494 | switch (event_notifier->instrumentation) { | |
1495 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 1496 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->event_kname, |
b01155ba FD |
1497 | event_notifier->desc->event_notifier_callback, |
1498 | event_notifier); | |
1499 | break; | |
b4a75708 | 1500 | |
dffef45d | 1501 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1502 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1503 | ret = 0; | |
1504 | break; | |
b4a75708 | 1505 | |
9de67196 FD |
1506 | case LTTNG_KERNEL_UPROBE: |
1507 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1508 | ret = 0; | |
1509 | break; | |
b4a75708 | 1510 | |
8a8ac9a8 FD |
1511 | case LTTNG_KERNEL_SYSCALL: |
1512 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1513 | break; | |
b4a75708 MD |
1514 | |
1515 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1516 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1517 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1518 | default: |
1519 | WARN_ON_ONCE(1); | |
1520 | } | |
1521 | if (!ret) | |
1522 | event_notifier->registered = 0; | |
1523 | return ret; | |
1524 | } | |
1525 | ||
dda6a249 MD |
1526 | /* |
1527 | * Only used internally at session destruction. | |
1528 | */ | |
be066e6c | 1529 | static |
a90917c3 | 1530 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1531 | { |
966ad253 MD |
1532 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1533 | ||
edeb3137 MD |
1534 | switch (event->instrumentation) { |
1535 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1536 | lttng_event_desc_put(event->desc); |
edeb3137 | 1537 | break; |
b4a75708 | 1538 | |
edeb3137 MD |
1539 | case LTTNG_KERNEL_KPROBE: |
1540 | module_put(event->desc->owner); | |
8bf17deb | 1541 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1542 | break; |
b4a75708 | 1543 | |
7371f44c MD |
1544 | case LTTNG_KERNEL_KRETPROBE: |
1545 | module_put(event->desc->owner); | |
1546 | lttng_kretprobes_destroy_private(event); | |
1547 | break; | |
b4a75708 | 1548 | |
33a39a3c | 1549 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1550 | break; |
b4a75708 | 1551 | |
149b9a9d YB |
1552 | case LTTNG_KERNEL_UPROBE: |
1553 | module_put(event->desc->owner); | |
83b802dc | 1554 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1555 | break; |
b4a75708 | 1556 | |
e884017c | 1557 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1558 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
edeb3137 MD |
1559 | default: |
1560 | WARN_ON_ONCE(1); | |
1561 | } | |
dda6a249 | 1562 | list_del(&event->list); |
437d5aa5 | 1563 | lttng_kernel_destroy_context(event->ctx); |
966ad253 MD |
1564 | lttng_free_event_filter_runtime(event); |
1565 | /* Free event enabler refs */ | |
1566 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1567 | &event->enablers_ref_head, node) | |
1568 | kfree(enabler_ref); | |
11b5a3c2 | 1569 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1570 | } |
1571 | ||
dffef45d FD |
1572 | /* |
1573 | * Only used internally at session destruction. | |
1574 | */ | |
1575 | static | |
1576 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1577 | { | |
3ef5cc03 MD |
1578 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1579 | ||
dffef45d FD |
1580 | switch (event_notifier->instrumentation) { |
1581 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1582 | lttng_event_desc_put(event_notifier->desc); |
1583 | break; | |
b4a75708 | 1584 | |
dffef45d | 1585 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1586 | module_put(event_notifier->desc->owner); |
1587 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1588 | break; | |
b4a75708 | 1589 | |
8a8ac9a8 FD |
1590 | case LTTNG_KERNEL_SYSCALL: |
1591 | break; | |
b4a75708 | 1592 | |
9de67196 FD |
1593 | case LTTNG_KERNEL_UPROBE: |
1594 | module_put(event_notifier->desc->owner); | |
1595 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1596 | break; | |
b4a75708 MD |
1597 | |
1598 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1599 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1600 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1601 | default: |
1602 | WARN_ON_ONCE(1); | |
1603 | } | |
1604 | list_del(&event_notifier->list); | |
3ef5cc03 MD |
1605 | lttng_free_event_notifier_filter_runtime(event_notifier); |
1606 | /* Free event enabler refs */ | |
1607 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1608 | &event_notifier->enablers_ref_head, node) | |
1609 | kfree(enabler_ref); | |
dffef45d FD |
1610 | kmem_cache_free(event_notifier_cache, event_notifier); |
1611 | } | |
1612 | ||
d1f652f8 MD |
1613 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1614 | enum tracker_type tracker_type) | |
e0130fab | 1615 | { |
d1f652f8 MD |
1616 | switch (tracker_type) { |
1617 | case TRACKER_PID: | |
1618 | return &session->pid_tracker; | |
1619 | case TRACKER_VPID: | |
1620 | return &session->vpid_tracker; | |
1621 | case TRACKER_UID: | |
1622 | return &session->uid_tracker; | |
1623 | case TRACKER_VUID: | |
1624 | return &session->vuid_tracker; | |
1625 | case TRACKER_GID: | |
1626 | return &session->gid_tracker; | |
1627 | case TRACKER_VGID: | |
1628 | return &session->vgid_tracker; | |
1629 | default: | |
1630 | WARN_ON_ONCE(1); | |
1631 | return NULL; | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | int lttng_session_track_id(struct lttng_session *session, | |
1636 | enum tracker_type tracker_type, int id) | |
1637 | { | |
1638 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1639 | int ret; |
1640 | ||
d1f652f8 MD |
1641 | tracker = get_tracker(session, tracker_type); |
1642 | if (!tracker) | |
1643 | return -EINVAL; | |
1644 | if (id < -1) | |
e0130fab MD |
1645 | return -EINVAL; |
1646 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1647 | if (id == -1) { |
1648 | /* track all ids: destroy tracker. */ | |
1649 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1650 | ret = 0; |
1651 | } else { | |
d1f652f8 | 1652 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1653 | } |
e0130fab MD |
1654 | mutex_unlock(&sessions_mutex); |
1655 | return ret; | |
1656 | } | |
1657 | ||
d1f652f8 MD |
1658 | int lttng_session_untrack_id(struct lttng_session *session, |
1659 | enum tracker_type tracker_type, int id) | |
e0130fab | 1660 | { |
d1f652f8 | 1661 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1662 | int ret; |
1663 | ||
d1f652f8 MD |
1664 | tracker = get_tracker(session, tracker_type); |
1665 | if (!tracker) | |
1666 | return -EINVAL; | |
1667 | if (id < -1) | |
e0130fab MD |
1668 | return -EINVAL; |
1669 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1670 | if (id == -1) { |
1671 | /* untrack all ids: replace by empty tracker. */ | |
1672 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1673 | } else { |
d1f652f8 | 1674 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1675 | } |
e0130fab MD |
1676 | mutex_unlock(&sessions_mutex); |
1677 | return ret; | |
1678 | } | |
1679 | ||
7e6f9ef6 | 1680 | static |
d1f652f8 | 1681 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1682 | { |
d1f652f8 MD |
1683 | struct lttng_id_tracker *id_tracker = m->private; |
1684 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1685 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1686 | int iter = 0, i; |
1687 | ||
1688 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1689 | if (id_tracker_p) { |
1690 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1691 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1692 | |
f934e302 | 1693 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1694 | if (iter++ >= *pos) |
1695 | return e; | |
1696 | } | |
1697 | } | |
1698 | } else { | |
d1f652f8 | 1699 | /* ID tracker disabled. */ |
7e6f9ef6 | 1700 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1701 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1702 | } |
1703 | iter++; | |
1704 | } | |
1705 | /* End of list */ | |
1706 | return NULL; | |
1707 | } | |
1708 | ||
1709 | /* Called with sessions_mutex held. */ | |
1710 | static | |
d1f652f8 | 1711 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1712 | { |
d1f652f8 MD |
1713 | struct lttng_id_tracker *id_tracker = m->private; |
1714 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1715 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1716 | int iter = 0, i; |
1717 | ||
1718 | (*ppos)++; | |
d1f652f8 MD |
1719 | if (id_tracker_p) { |
1720 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1721 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1722 | |
f934e302 | 1723 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1724 | if (iter++ >= *ppos) |
1725 | return e; | |
1726 | } | |
1727 | } | |
1728 | } else { | |
d1f652f8 | 1729 | /* ID tracker disabled. */ |
7e6f9ef6 | 1730 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1731 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1732 | iter++; |
1733 | } | |
1734 | ||
1735 | /* End of list */ | |
1736 | return NULL; | |
1737 | } | |
1738 | ||
1739 | static | |
d1f652f8 | 1740 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1741 | { |
1742 | mutex_unlock(&sessions_mutex); | |
1743 | } | |
1744 | ||
1745 | static | |
d1f652f8 | 1746 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1747 | { |
d1f652f8 MD |
1748 | struct lttng_id_tracker *id_tracker = m->private; |
1749 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1750 | int id; | |
7e6f9ef6 | 1751 | |
d1f652f8 | 1752 | if (p == id_tracker_p) { |
7e6f9ef6 | 1753 | /* Tracker disabled. */ |
d1f652f8 | 1754 | id = -1; |
7e6f9ef6 | 1755 | } else { |
d1f652f8 | 1756 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1757 | |
d1f652f8 MD |
1758 | id = lttng_id_tracker_get_node_id(e); |
1759 | } | |
1760 | switch (id_tracker->tracker_type) { | |
1761 | case TRACKER_PID: | |
1762 | seq_printf(m, "process { pid = %d; };\n", id); | |
1763 | break; | |
1764 | case TRACKER_VPID: | |
1765 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1766 | break; | |
1767 | case TRACKER_UID: | |
1768 | seq_printf(m, "user { uid = %d; };\n", id); | |
1769 | break; | |
1770 | case TRACKER_VUID: | |
1771 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1772 | break; | |
1773 | case TRACKER_GID: | |
1774 | seq_printf(m, "group { gid = %d; };\n", id); | |
1775 | break; | |
1776 | case TRACKER_VGID: | |
1777 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1778 | break; | |
1779 | default: | |
1780 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1781 | } |
7e6f9ef6 MD |
1782 | return 0; |
1783 | } | |
1784 | ||
1785 | static | |
d1f652f8 MD |
1786 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1787 | .start = id_list_start, | |
1788 | .next = id_list_next, | |
1789 | .stop = id_list_stop, | |
1790 | .show = id_list_show, | |
7e6f9ef6 MD |
1791 | }; |
1792 | ||
1793 | static | |
d1f652f8 | 1794 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1795 | { |
d1f652f8 | 1796 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1797 | } |
1798 | ||
1799 | static | |
d1f652f8 | 1800 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1801 | { |
1802 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1803 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1804 | int ret; |
1805 | ||
d1f652f8 | 1806 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1807 | ret = seq_release(inode, file); |
d1f652f8 MD |
1808 | if (!ret) |
1809 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1810 | return ret; |
1811 | } | |
1812 | ||
d1f652f8 | 1813 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1814 | .owner = THIS_MODULE, |
d1f652f8 | 1815 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1816 | .read = seq_read, |
1817 | .llseek = seq_lseek, | |
d1f652f8 | 1818 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1819 | }; |
1820 | ||
d1f652f8 MD |
1821 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1822 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1823 | { |
d1f652f8 | 1824 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1825 | struct seq_file *m; |
1826 | int file_fd, ret; | |
1827 | ||
1828 | file_fd = lttng_get_unused_fd(); | |
1829 | if (file_fd < 0) { | |
1830 | ret = file_fd; | |
1831 | goto fd_error; | |
1832 | } | |
1833 | ||
d1f652f8 MD |
1834 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1835 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1836 | NULL, O_RDWR); |
d1f652f8 MD |
1837 | if (IS_ERR(tracker_ids_list_file)) { |
1838 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1839 | goto file_error; |
1840 | } | |
98d7281c MJ |
1841 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1842 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1843 | goto refcount_error; |
1844 | } | |
d1f652f8 | 1845 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1846 | if (ret < 0) |
1847 | goto open_error; | |
d1f652f8 MD |
1848 | m = tracker_ids_list_file->private_data; |
1849 | ||
1850 | m->private = get_tracker(session, tracker_type); | |
1851 | BUG_ON(!m->private); | |
1852 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1853 | |
1854 | return file_fd; | |
1855 | ||
1856 | open_error: | |
9c1f4643 MD |
1857 | atomic_long_dec(&session->file->f_count); |
1858 | refcount_error: | |
d1f652f8 | 1859 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1860 | file_error: |
1861 | put_unused_fd(file_fd); | |
1862 | fd_error: | |
1863 | return ret; | |
1864 | } | |
1865 | ||
3c997079 MD |
1866 | /* |
1867 | * Enabler management. | |
1868 | */ | |
1869 | static | |
4993071a PP |
1870 | int lttng_match_enabler_star_glob(const char *desc_name, |
1871 | const char *pattern) | |
3c997079 | 1872 | { |
cbc19040 MD |
1873 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1874 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1875 | return 0; |
1876 | return 1; | |
1877 | } | |
1878 | ||
1879 | static | |
4ecb5ad5 MD |
1880 | int lttng_match_enabler_name(const char *desc_name, |
1881 | const char *name) | |
3c997079 | 1882 | { |
4ecb5ad5 | 1883 | if (strcmp(desc_name, name)) |
3c997079 MD |
1884 | return 0; |
1885 | return 1; | |
1886 | } | |
1887 | ||
437d5aa5 | 1888 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1889 | struct lttng_enabler *enabler) |
1890 | { | |
4ecb5ad5 | 1891 | const char *desc_name, *enabler_name; |
badfe9f5 | 1892 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1893 | |
1894 | enabler_name = enabler->event_param.name; | |
1895 | switch (enabler->event_param.instrumentation) { | |
1896 | case LTTNG_KERNEL_TRACEPOINT: | |
437d5aa5 | 1897 | desc_name = desc->event_name; |
3b861b22 FD |
1898 | switch (enabler->format_type) { |
1899 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1900 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1901 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1902 | return lttng_match_enabler_name(desc_name, enabler_name); |
1903 | default: | |
1904 | return -EINVAL; | |
1905 | } | |
4ecb5ad5 | 1906 | break; |
b4a75708 | 1907 | |
4ecb5ad5 | 1908 | case LTTNG_KERNEL_SYSCALL: |
437d5aa5 | 1909 | desc_name = desc->event_name; |
badfe9f5 | 1910 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1911 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1912 | compat = true; |
1913 | } | |
4ecb5ad5 MD |
1914 | if (!strncmp(desc_name, "syscall_exit_", |
1915 | strlen("syscall_exit_"))) { | |
1916 | desc_name += strlen("syscall_exit_"); | |
1917 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1918 | strlen("syscall_entry_"))) { | |
1919 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1920 | entry = true; |
4ecb5ad5 MD |
1921 | } else { |
1922 | WARN_ON_ONCE(1); | |
1923 | return -EINVAL; | |
1924 | } | |
badfe9f5 MD |
1925 | switch (enabler->event_param.u.syscall.entryexit) { |
1926 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1927 | break; | |
1928 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1929 | if (!entry) | |
1930 | return 0; | |
1931 | break; | |
1932 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1933 | if (entry) | |
1934 | return 0; | |
1935 | break; | |
1936 | default: | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | switch (enabler->event_param.u.syscall.abi) { | |
1940 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1941 | break; | |
1942 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1943 | if (compat) | |
1944 | return 0; | |
1945 | break; | |
1946 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1947 | if (!compat) | |
1948 | return 0; | |
1949 | break; | |
1950 | default: | |
1951 | return -EINVAL; | |
1952 | } | |
1953 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1954 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1955 | switch (enabler->format_type) { |
1956 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1957 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1958 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1959 | return lttng_match_enabler_name(desc_name, enabler_name); |
1960 | default: | |
1961 | return -EINVAL; | |
1962 | } | |
1963 | break; | |
cff6938b | 1964 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1965 | return -EINVAL; /* Not implemented. */ |
1966 | default: | |
1967 | return -EINVAL; | |
1968 | } | |
4ecb5ad5 | 1969 | break; |
b4a75708 | 1970 | |
4ecb5ad5 MD |
1971 | default: |
1972 | WARN_ON_ONCE(1); | |
1973 | return -EINVAL; | |
1974 | } | |
3c997079 MD |
1975 | } |
1976 | ||
1977 | static | |
b2bc0bc8 FD |
1978 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1979 | struct lttng_event *event) | |
3c997079 | 1980 | { |
b2bc0bc8 FD |
1981 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1982 | event_enabler); | |
1983 | ||
1984 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1985 | return 0; |
b2bc0bc8 FD |
1986 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1987 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1988 | return 1; |
1989 | else | |
1990 | return 0; | |
1991 | } | |
1992 | ||
b01155ba FD |
1993 | static |
1994 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1995 | struct lttng_event_notifier *event_notifier) | |
1996 | { | |
1997 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1998 | event_notifier_enabler); | |
1999 | ||
2000 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
2001 | return 0; | |
2002 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
2003 | && event_notifier->group == event_notifier_enabler->group | |
2004 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2005 | return 1; | |
2006 | else | |
2007 | return 0; | |
2008 | } | |
2009 | ||
3c997079 | 2010 | static |
b2bc0bc8 FD |
2011 | struct lttng_enabler_ref *lttng_enabler_ref( |
2012 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2013 | struct lttng_enabler *enabler) |
2014 | { | |
2015 | struct lttng_enabler_ref *enabler_ref; | |
2016 | ||
b2bc0bc8 | 2017 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2018 | if (enabler_ref->ref == enabler) |
2019 | return enabler_ref; | |
2020 | } | |
2021 | return NULL; | |
2022 | } | |
2023 | ||
3c997079 | 2024 | static |
1b917d6b | 2025 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2026 | { |
b2bc0bc8 | 2027 | struct lttng_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2028 | struct lttng_kernel_probe_desc *probe_desc; |
2029 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2030 | int i; |
2031 | struct list_head *probe_list; | |
2032 | ||
2033 | probe_list = lttng_get_probe_list_head(); | |
2034 | /* | |
2035 | * For each probe event, if we find that a probe event matches | |
2036 | * our enabler, create an associated lttng_event if not | |
2037 | * already present. | |
2038 | */ | |
2039 | list_for_each_entry(probe_desc, probe_list, head) { | |
2040 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2041 | int found = 0; | |
2042 | struct hlist_head *head; | |
3c997079 MD |
2043 | struct lttng_event *event; |
2044 | ||
2045 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2046 | if (!lttng_desc_match_enabler(desc, |
2047 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2048 | continue; |
3c997079 MD |
2049 | |
2050 | /* | |
2051 | * Check if already created. | |
2052 | */ | |
4a11ef1c FD |
2053 | head = utils_borrow_hash_table_bucket( |
2054 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 2055 | desc->event_name); |
d216ecae | 2056 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 2057 | if (event->desc == desc |
b2bc0bc8 | 2058 | && event->chan == event_enabler->chan) |
3c997079 MD |
2059 | found = 1; |
2060 | } | |
2061 | if (found) | |
2062 | continue; | |
2063 | ||
2064 | /* | |
2065 | * We need to create an event for this | |
2066 | * event probe. | |
2067 | */ | |
b2bc0bc8 | 2068 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
2069 | NULL, NULL, desc, |
2070 | LTTNG_KERNEL_TRACEPOINT); | |
2071 | if (!event) { | |
5a15f70c | 2072 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2073 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2074 | } |
2075 | } | |
2076 | } | |
2077 | } | |
2078 | ||
b01155ba FD |
2079 | static |
2080 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2081 | { | |
2082 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2083 | struct lttng_kernel_probe_desc *probe_desc; |
2084 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2085 | int i; |
2086 | struct list_head *probe_list; | |
2087 | ||
2088 | probe_list = lttng_get_probe_list_head(); | |
2089 | /* | |
2090 | * For each probe event, if we find that a probe event matches | |
2091 | * our enabler, create an associated lttng_event_notifier if not | |
2092 | * already present. | |
2093 | */ | |
2094 | list_for_each_entry(probe_desc, probe_list, head) { | |
2095 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2096 | int found = 0; | |
2097 | struct hlist_head *head; | |
2098 | struct lttng_event_notifier *event_notifier; | |
2099 | ||
2100 | desc = probe_desc->event_desc[i]; | |
2101 | if (!lttng_desc_match_enabler(desc, | |
2102 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2103 | continue; | |
2104 | ||
2105 | /* | |
2106 | * Check if already created. | |
2107 | */ | |
2108 | head = utils_borrow_hash_table_bucket( | |
2109 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2110 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
b01155ba FD |
2111 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { |
2112 | if (event_notifier->desc == desc | |
2113 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2114 | found = 1; | |
2115 | } | |
2116 | if (found) | |
2117 | continue; | |
2118 | ||
2119 | /* | |
2120 | * We need to create a event_notifier for this event probe. | |
2121 | */ | |
2122 | event_notifier = _lttng_event_notifier_create(desc, | |
2123 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2124 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2125 | event_notifier_group, NULL, NULL, |
2126 | LTTNG_KERNEL_TRACEPOINT); | |
2127 | if (IS_ERR(event_notifier)) { | |
2128 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2129 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2130 | } |
2131 | } | |
2132 | } | |
2133 | } | |
2134 | ||
33a39a3c | 2135 | static |
1b917d6b | 2136 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2137 | { |
2138 | int ret; | |
2139 | ||
3b82c4e1 | 2140 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2141 | WARN_ON_ONCE(ret); |
2142 | } | |
2143 | ||
8a8ac9a8 FD |
2144 | static |
2145 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2146 | { | |
2147 | int ret; | |
2148 | ||
2149 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2150 | WARN_ON_ONCE(ret); | |
2151 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2152 | WARN_ON_ONCE(ret); | |
2153 | } | |
2154 | ||
33a39a3c MD |
2155 | /* |
2156 | * Create struct lttng_event if it is missing and present in the list of | |
2157 | * tracepoint probes. | |
2158 | * Should be called with sessions mutex held. | |
2159 | */ | |
2160 | static | |
b2bc0bc8 | 2161 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2162 | { |
b2bc0bc8 | 2163 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2164 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2165 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2166 | break; |
b4a75708 | 2167 | |
33a39a3c | 2168 | case LTTNG_KERNEL_SYSCALL: |
1b917d6b | 2169 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2170 | break; |
b4a75708 | 2171 | |
33a39a3c MD |
2172 | default: |
2173 | WARN_ON_ONCE(1); | |
2174 | break; | |
2175 | } | |
2176 | } | |
2177 | ||
3c997079 | 2178 | /* |
b2bc0bc8 | 2179 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2180 | * and add backward reference from the event to the enabler. |
2181 | * Should be called with sessions mutex held. | |
2182 | */ | |
2183 | static | |
b2bc0bc8 | 2184 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2185 | { |
b2bc0bc8 FD |
2186 | struct lttng_channel *chan = event_enabler->chan; |
2187 | struct lttng_session *session = event_enabler->chan->session; | |
2188 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2189 | struct lttng_event *event; |
2190 | ||
b2bc0bc8 | 2191 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2192 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2193 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2194 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2195 | int enabled = base_enabler->enabled; |
2196 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2197 | ||
2198 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2199 | WRITE_ONCE(chan->syscall_all_entry, enabled); | |
2200 | ||
2201 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2202 | WRITE_ONCE(chan->syscall_all_exit, enabled); | |
badfe9f5 MD |
2203 | } |
2204 | ||
3c997079 | 2205 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2206 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2207 | |
b2bc0bc8 | 2208 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2209 | list_for_each_entry(event, &session->events, list) { |
2210 | struct lttng_enabler_ref *enabler_ref; | |
2211 | ||
b2bc0bc8 | 2212 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2213 | continue; |
b2bc0bc8 FD |
2214 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2215 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2216 | if (!enabler_ref) { |
2217 | /* | |
2218 | * If no backward ref, create it. | |
b2bc0bc8 | 2219 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2220 | */ |
2221 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2222 | if (!enabler_ref) | |
2223 | return -ENOMEM; | |
b2bc0bc8 | 2224 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2225 | list_add(&enabler_ref->node, |
2226 | &event->enablers_ref_head); | |
2227 | } | |
2228 | ||
f127e61e MD |
2229 | /* |
2230 | * Link filter bytecodes if not linked yet. | |
2231 | */ | |
2dfda770 FD |
2232 | lttng_enabler_link_bytecode(event->desc, |
2233 | lttng_static_ctx, | |
183e8b3a | 2234 | &event->filter_bytecode_runtime_head, |
60206944 | 2235 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2236 | |
3c997079 MD |
2237 | /* TODO: merge event context. */ |
2238 | } | |
2239 | return 0; | |
2240 | } | |
2241 | ||
b01155ba FD |
2242 | /* |
2243 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2244 | * tracepoint probes. | |
2245 | * Should be called with sessions mutex held. | |
2246 | */ | |
2247 | static | |
2248 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2249 | { | |
2250 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2251 | case LTTNG_KERNEL_TRACEPOINT: | |
2252 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2253 | break; | |
b4a75708 | 2254 | |
8a8ac9a8 FD |
2255 | case LTTNG_KERNEL_SYSCALL: |
2256 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2257 | break; | |
b4a75708 | 2258 | |
b01155ba FD |
2259 | default: |
2260 | WARN_ON_ONCE(1); | |
2261 | break; | |
2262 | } | |
2263 | } | |
2264 | ||
2265 | /* | |
2266 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2267 | */ | |
2268 | static | |
8a8ac9a8 FD |
2269 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2270 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2271 | { |
2272 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2273 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2274 | struct lttng_event_notifier *event_notifier; |
2275 | ||
8a8ac9a8 FD |
2276 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2277 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2278 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2279 | !strcmp(base_enabler->event_param.name, "*")) { | |
2280 | ||
2281 | int enabled = base_enabler->enabled; | |
2282 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2283 | ||
2284 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2285 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2286 | ||
2287 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2288 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2289 | ||
2290 | } | |
2291 | ||
b01155ba FD |
2292 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2293 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2294 | ||
2295 | /* Link the created event_notifier with its associated enabler. */ | |
2296 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2297 | struct lttng_enabler_ref *enabler_ref; | |
2298 | ||
2299 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2300 | continue; | |
2301 | ||
2302 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2303 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2304 | if (!enabler_ref) { | |
2305 | /* | |
2306 | * If no backward ref, create it. | |
2307 | * Add backward ref from event_notifier to enabler. | |
2308 | */ | |
2309 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2310 | if (!enabler_ref) | |
2311 | return -ENOMEM; | |
2312 | ||
2313 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2314 | event_notifier_enabler); | |
2315 | list_add(&enabler_ref->node, | |
2316 | &event_notifier->enablers_ref_head); | |
2317 | } | |
2318 | ||
2319 | /* | |
2320 | * Link filter bytecodes if not linked yet. | |
2321 | */ | |
2322 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2323 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2324 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2325 | |
2326 | /* Link capture bytecodes if not linked yet. */ | |
2327 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2328 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2329 | &event_notifier_enabler->capture_bytecode_head); | |
2330 | ||
2331 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2332 | } |
2333 | return 0; | |
2334 | } | |
2335 | ||
3c997079 MD |
2336 | /* |
2337 | * Called at module load: connect the probe on all enablers matching | |
2338 | * this event. | |
2339 | * Called with sessions lock held. | |
2340 | */ | |
2341 | int lttng_fix_pending_events(void) | |
2342 | { | |
2343 | struct lttng_session *session; | |
2344 | ||
2345 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2346 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2347 | return 0; |
2348 | } | |
2349 | ||
b01155ba FD |
2350 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2351 | struct lttng_event_notifier_group *event_notifier_group) | |
2352 | { | |
2353 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2354 | ||
2355 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2356 | node) { | |
2357 | if (event_notifier_enabler->base.enabled) | |
2358 | return true; | |
2359 | } | |
2360 | return false; | |
2361 | } | |
2362 | ||
2363 | bool lttng_event_notifier_active(void) | |
2364 | { | |
2365 | struct lttng_event_notifier_group *event_notifier_group; | |
2366 | ||
2367 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2368 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2369 | return true; | |
2370 | } | |
2371 | return false; | |
2372 | } | |
2373 | ||
2374 | int lttng_fix_pending_event_notifiers(void) | |
2375 | { | |
2376 | struct lttng_event_notifier_group *event_notifier_group; | |
2377 | ||
2378 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2379 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2380 | return 0; | |
2381 | } | |
2382 | ||
b2bc0bc8 FD |
2383 | struct lttng_event_enabler *lttng_event_enabler_create( |
2384 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2385 | struct lttng_kernel_event *event_param, |
2386 | struct lttng_channel *chan) | |
2387 | { | |
b2bc0bc8 | 2388 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2389 | |
b2bc0bc8 FD |
2390 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2391 | if (!event_enabler) | |
3c997079 | 2392 | return NULL; |
b2bc0bc8 FD |
2393 | event_enabler->base.format_type = format_type; |
2394 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2395 | memcpy(&event_enabler->base.event_param, event_param, | |
2396 | sizeof(event_enabler->base.event_param)); | |
2397 | event_enabler->chan = chan; | |
3c997079 | 2398 | /* ctx left NULL */ |
b2bc0bc8 FD |
2399 | event_enabler->base.enabled = 0; |
2400 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2401 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2402 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2403 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2404 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2405 | return event_enabler; |
3c997079 MD |
2406 | } |
2407 | ||
b2bc0bc8 | 2408 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2409 | { |
2410 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2411 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2412 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2413 | mutex_unlock(&sessions_mutex); |
2414 | return 0; | |
2415 | } | |
2416 | ||
b2bc0bc8 | 2417 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2418 | { |
2419 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2420 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2421 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2422 | mutex_unlock(&sessions_mutex); |
2423 | return 0; | |
2424 | } | |
2425 | ||
b2bc0bc8 | 2426 | static |
183e8b3a | 2427 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2428 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2429 | { | |
89ec2b91 | 2430 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2431 | uint32_t bytecode_len; |
2432 | int ret; | |
2433 | ||
2434 | ret = get_user(bytecode_len, &bytecode->len); | |
2435 | if (ret) | |
2436 | return ret; | |
52cfcdf3 | 2437 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2438 | GFP_KERNEL); |
2439 | if (!bytecode_node) | |
2440 | return -ENOMEM; | |
2441 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2442 | sizeof(*bytecode) + bytecode_len); | |
2443 | if (ret) | |
2444 | goto error_free; | |
b2bc0bc8 | 2445 | |
89ec2b91 | 2446 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2447 | bytecode_node->enabler = enabler; |
2448 | /* Enforce length based on allocated size */ | |
2449 | bytecode_node->bc.len = bytecode_len; | |
2450 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2451 | |
07dfc1d0 MD |
2452 | return 0; |
2453 | ||
2454 | error_free: | |
52cfcdf3 | 2455 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2456 | return ret; |
2457 | } | |
2458 | ||
183e8b3a | 2459 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2460 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2461 | { | |
2462 | int ret; | |
183e8b3a | 2463 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2464 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2465 | if (ret) | |
2466 | goto error; | |
2467 | ||
2468 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2469 | return 0; | |
2470 | ||
2471 | error: | |
2472 | return ret; | |
2473 | } | |
2474 | ||
3aed4dca FD |
2475 | int lttng_event_add_callsite(struct lttng_event *event, |
2476 | struct lttng_kernel_event_callsite __user *callsite) | |
2477 | { | |
2478 | ||
2479 | switch (event->instrumentation) { | |
2480 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2481 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2482 | default: |
2483 | return -EINVAL; | |
2484 | } | |
2485 | } | |
2486 | ||
b2bc0bc8 | 2487 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2488 | struct lttng_kernel_context *context_param) |
2489 | { | |
2490 | return -ENOSYS; | |
2491 | } | |
2492 | ||
2493 | static | |
2494 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2495 | { | |
89ec2b91 | 2496 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2497 | |
2498 | /* Destroy filter bytecode */ | |
2499 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2500 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2501 | lttng_kvfree(filter_node); |
07dfc1d0 | 2502 | } |
b2bc0bc8 FD |
2503 | } |
2504 | ||
2505 | static | |
2506 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2507 | { | |
2508 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2509 | |
3c997079 | 2510 | /* Destroy contexts */ |
437d5aa5 | 2511 | lttng_kernel_destroy_context(event_enabler->ctx); |
3c997079 | 2512 | |
b2bc0bc8 FD |
2513 | list_del(&event_enabler->node); |
2514 | kfree(event_enabler); | |
3c997079 MD |
2515 | } |
2516 | ||
dffef45d FD |
2517 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2518 | struct lttng_event_notifier_group *event_notifier_group, | |
2519 | enum lttng_enabler_format_type format_type, | |
2520 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2521 | { | |
2522 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2523 | ||
2524 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2525 | if (!event_notifier_enabler) | |
2526 | return NULL; | |
2527 | ||
2528 | event_notifier_enabler->base.format_type = format_type; | |
2529 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2530 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2531 | ||
99f52fcc | 2532 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2533 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2534 | |
8a8ac9a8 FD |
2535 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2536 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2537 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2538 | ||
2539 | event_notifier_enabler->base.enabled = 0; | |
2540 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2541 | event_notifier_enabler->group = event_notifier_group; | |
2542 | ||
2543 | mutex_lock(&sessions_mutex); | |
2544 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2545 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2546 | |
2547 | mutex_unlock(&sessions_mutex); | |
2548 | ||
2549 | return event_notifier_enabler; | |
2550 | } | |
2551 | ||
2552 | int lttng_event_notifier_enabler_enable( | |
2553 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2554 | { | |
2555 | mutex_lock(&sessions_mutex); | |
2556 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2557 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2558 | mutex_unlock(&sessions_mutex); |
2559 | return 0; | |
2560 | } | |
2561 | ||
2562 | int lttng_event_notifier_enabler_disable( | |
2563 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2564 | { | |
2565 | mutex_lock(&sessions_mutex); | |
2566 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2567 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2568 | mutex_unlock(&sessions_mutex); |
2569 | return 0; | |
2570 | } | |
2571 | ||
183e8b3a | 2572 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2573 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2574 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2575 | { | |
2576 | int ret; | |
2577 | ||
183e8b3a | 2578 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2579 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2580 | bytecode); | |
2581 | if (ret) | |
2582 | goto error; | |
2583 | ||
b01155ba | 2584 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2585 | return 0; |
2586 | ||
2587 | error: | |
2588 | return ret; | |
2589 | } | |
2590 | ||
99d223ad FD |
2591 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2592 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2593 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2594 | { | |
2595 | struct lttng_bytecode_node *bytecode_node; | |
2596 | struct lttng_enabler *enabler = | |
2597 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2598 | uint32_t bytecode_len; | |
2599 | int ret; | |
2600 | ||
2601 | ret = get_user(bytecode_len, &bytecode->len); | |
2602 | if (ret) | |
2603 | return ret; | |
2604 | ||
2605 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2606 | GFP_KERNEL); | |
2607 | if (!bytecode_node) | |
2608 | return -ENOMEM; | |
2609 | ||
2610 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2611 | sizeof(*bytecode) + bytecode_len); | |
2612 | if (ret) | |
2613 | goto error_free; | |
2614 | ||
2615 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2616 | bytecode_node->enabler = enabler; | |
2617 | ||
2618 | /* Enforce length based on allocated size */ | |
2619 | bytecode_node->bc.len = bytecode_len; | |
2620 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2621 | ||
2622 | event_notifier_enabler->num_captures++; | |
2623 | ||
2624 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2625 | goto end; | |
2626 | ||
2627 | error_free: | |
2628 | lttng_kvfree(bytecode_node); | |
2629 | end: | |
2630 | return ret; | |
2631 | } | |
2632 | ||
9de67196 FD |
2633 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2634 | struct lttng_kernel_event_callsite __user *callsite) | |
2635 | { | |
2636 | ||
2637 | switch (event_notifier->instrumentation) { | |
2638 | case LTTNG_KERNEL_UPROBE: | |
2639 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2640 | callsite); | |
2641 | default: | |
2642 | return -EINVAL; | |
2643 | } | |
2644 | } | |
2645 | ||
dffef45d FD |
2646 | int lttng_event_notifier_enabler_attach_context( |
2647 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2648 | struct lttng_kernel_context *context_param) | |
2649 | { | |
2650 | return -ENOSYS; | |
2651 | } | |
2652 | ||
2653 | static | |
2654 | void lttng_event_notifier_enabler_destroy( | |
2655 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2656 | { | |
2657 | if (!event_notifier_enabler) { | |
2658 | return; | |
2659 | } | |
2660 | ||
2661 | list_del(&event_notifier_enabler->node); | |
2662 | ||
2663 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2664 | kfree(event_notifier_enabler); | |
2665 | } | |
2666 | ||
3c997079 | 2667 | /* |
b2bc0bc8 | 2668 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2669 | * session. |
2670 | * Should be called with sessions mutex held. | |
2671 | */ | |
2672 | static | |
b2bc0bc8 | 2673 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2674 | { |
b2bc0bc8 | 2675 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2676 | struct lttng_event *event; |
2677 | ||
b2bc0bc8 FD |
2678 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2679 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2680 | /* |
2681 | * For each event, if at least one of its enablers is enabled, | |
2682 | * and its channel and session transient states are enabled, we | |
2683 | * enable the event, else we disable it. | |
2684 | */ | |
2685 | list_for_each_entry(event, &session->events, list) { | |
2686 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2687 | struct lttng_bytecode_runtime *runtime; |
2688 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2689 | |
4ecb5ad5 | 2690 | switch (event->instrumentation) { |
b4a75708 | 2691 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
4ecb5ad5 | 2692 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
2693 | /* Enable events */ |
2694 | list_for_each_entry(enabler_ref, | |
2695 | &event->enablers_ref_head, node) { | |
2696 | if (enabler_ref->ref->enabled) { | |
2697 | enabled = 1; | |
2698 | break; | |
2699 | } | |
2700 | } | |
4ecb5ad5 | 2701 | break; |
b4a75708 | 2702 | |
4ecb5ad5 | 2703 | default: |
3c997079 MD |
2704 | /* Not handled with lazy sync. */ |
2705 | continue; | |
2706 | } | |
2707 | /* | |
2708 | * Enabled state is based on union of enablers, with | |
2709 | * intesection of session and channel transient enable | |
2710 | * states. | |
2711 | */ | |
2712 | enabled = enabled && session->tstate && event->chan->tstate; | |
2713 | ||
a8f2d0c7 | 2714 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2715 | /* |
2716 | * Sync tracepoint registration with event enabled | |
2717 | * state. | |
2718 | */ | |
2719 | if (enabled) { | |
2720 | register_event(event); | |
2721 | } else { | |
2722 | _lttng_event_unregister(event); | |
2723 | } | |
07dfc1d0 MD |
2724 | |
2725 | /* Check if has enablers without bytecode enabled */ | |
2726 | list_for_each_entry(enabler_ref, | |
2727 | &event->enablers_ref_head, node) { | |
2728 | if (enabler_ref->ref->enabled | |
2729 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2730 | has_enablers_without_bytecode = 1; | |
2731 | break; | |
2732 | } | |
2733 | } | |
2734 | event->has_enablers_without_bytecode = | |
2735 | has_enablers_without_bytecode; | |
2736 | ||
2737 | /* Enable filters */ | |
2738 | list_for_each_entry(runtime, | |
183e8b3a | 2739 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2740 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2741 | } |
2742 | } | |
2743 | ||
2744 | /* | |
2745 | * Apply enablers to session events, adding events to session if need | |
2746 | * be. It is required after each modification applied to an active | |
2747 | * session, and right before session "start". | |
2748 | * "lazy" sync means we only sync if required. | |
2749 | * Should be called with sessions mutex held. | |
2750 | */ | |
2751 | static | |
b2bc0bc8 | 2752 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2753 | { |
2754 | /* We can skip if session is not active */ | |
2755 | if (!session->active) | |
2756 | return; | |
b2bc0bc8 | 2757 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2758 | } |
2759 | ||
b01155ba FD |
2760 | static |
2761 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2762 | { | |
2763 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2764 | struct lttng_event_notifier *event_notifier; | |
2765 | ||
2766 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2767 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2768 | ||
2769 | /* | |
2770 | * For each event_notifier, if at least one of its enablers is enabled, | |
2771 | * we enable the event_notifier, else we disable it. | |
2772 | */ | |
2773 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2774 | struct lttng_enabler_ref *enabler_ref; | |
2775 | struct lttng_bytecode_runtime *runtime; | |
2776 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2777 | ||
2778 | switch (event_notifier->instrumentation) { | |
b4a75708 | 2779 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
b01155ba FD |
2780 | case LTTNG_KERNEL_SYSCALL: |
2781 | /* Enable event_notifiers */ | |
2782 | list_for_each_entry(enabler_ref, | |
2783 | &event_notifier->enablers_ref_head, node) { | |
2784 | if (enabler_ref->ref->enabled) { | |
2785 | enabled = 1; | |
2786 | break; | |
2787 | } | |
2788 | } | |
2789 | break; | |
b4a75708 | 2790 | |
b01155ba FD |
2791 | default: |
2792 | /* Not handled with sync. */ | |
2793 | continue; | |
2794 | } | |
2795 | ||
2796 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2797 | /* | |
2798 | * Sync tracepoint registration with event_notifier enabled | |
2799 | * state. | |
2800 | */ | |
2801 | if (enabled) { | |
2802 | if (!event_notifier->registered) | |
2803 | register_event_notifier(event_notifier); | |
2804 | } else { | |
2805 | if (event_notifier->registered) | |
2806 | _lttng_event_notifier_unregister(event_notifier); | |
2807 | } | |
2808 | ||
2809 | /* Check if has enablers without bytecode enabled */ | |
2810 | list_for_each_entry(enabler_ref, | |
2811 | &event_notifier->enablers_ref_head, node) { | |
2812 | if (enabler_ref->ref->enabled | |
2813 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2814 | has_enablers_without_bytecode = 1; | |
2815 | break; | |
2816 | } | |
2817 | } | |
2818 | event_notifier->has_enablers_without_bytecode = | |
2819 | has_enablers_without_bytecode; | |
2820 | ||
2821 | /* Enable filters */ | |
2822 | list_for_each_entry(runtime, | |
183e8b3a | 2823 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2824 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2825 | |
2826 | /* Enable captures */ | |
2827 | list_for_each_entry(runtime, | |
2828 | &event_notifier->capture_bytecode_runtime_head, node) | |
2829 | lttng_bytecode_capture_sync_state(runtime); | |
c3eddb2e MD |
2830 | |
2831 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier->num_captures); | |
b01155ba FD |
2832 | } |
2833 | } | |
2834 | ||
1ec3f75a | 2835 | /* |
d83004aa JD |
2836 | * Serialize at most one packet worth of metadata into a metadata |
2837 | * channel. | |
92d9f5e6 MD |
2838 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2839 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2840 | * allows us to do racy operations such as looking for remaining space left in | |
2841 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2842 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2843 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2844 | * Returns the number of bytes written in the channel, 0 if no data |
2845 | * was written and a negative value on error. | |
1ec3f75a | 2846 | */ |
b3b8072b | 2847 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2848 | struct channel *chan, bool *coherent) |
d83004aa JD |
2849 | { |
2850 | struct lib_ring_buffer_ctx ctx; | |
2851 | int ret = 0; | |
2852 | size_t len, reserve_len; | |
2853 | ||
f613e3e6 | 2854 | /* |
92d9f5e6 MD |
2855 | * Ensure we support mutiple get_next / put sequences followed by |
2856 | * put_next. The metadata cache lock protects reading the metadata | |
2857 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2858 | * "flush" operations on the buffer invoked by different processes. | |
2859 | * Moreover, since the metadata cache memory can be reallocated, we | |
2860 | * need to have exclusive access against updates even though we only | |
2861 | * read it. | |
f613e3e6 | 2862 | */ |
92d9f5e6 | 2863 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2864 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2865 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2866 | goto end; |
f613e3e6 | 2867 | |
9616f0bf JD |
2868 | /* Metadata regenerated, change the version. */ |
2869 | if (stream->metadata_cache->version != stream->version) | |
2870 | stream->version = stream->metadata_cache->version; | |
2871 | ||
d83004aa | 2872 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2873 | stream->metadata_in; |
9de2c215 | 2874 | if (!len) |
de23d59d | 2875 | goto end; |
d83004aa | 2876 | reserve_len = min_t(size_t, |
b3b8072b | 2877 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2878 | len); |
b3b8072b | 2879 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2880 | sizeof(char), -1); |
2881 | /* | |
2882 | * If reservation failed, return an error to the caller. | |
2883 | */ | |
b3b8072b | 2884 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2885 | if (ret != 0) { |
2886 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2887 | stream->coherent = false; |
d83004aa JD |
2888 | goto end; |
2889 | } | |
b3b8072b | 2890 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2891 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2892 | reserve_len); |
b3b8072b | 2893 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2894 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2895 | if (reserve_len < len) |
8b97fd42 MD |
2896 | stream->coherent = false; |
2897 | else | |
2898 | stream->coherent = true; | |
d83004aa JD |
2899 | ret = reserve_len; |
2900 | ||
2901 | end: | |
8b97fd42 MD |
2902 | if (coherent) |
2903 | *coherent = stream->coherent; | |
92d9f5e6 | 2904 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2905 | return ret; |
2906 | } | |
2907 | ||
8b97fd42 MD |
2908 | static |
2909 | void lttng_metadata_begin(struct lttng_session *session) | |
2910 | { | |
3e75e2a7 MD |
2911 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2912 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2913 | } |
2914 | ||
2915 | static | |
2916 | void lttng_metadata_end(struct lttng_session *session) | |
2917 | { | |
3e75e2a7 MD |
2918 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2919 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2920 | struct lttng_metadata_stream *stream; | |
2921 | ||
3e75e2a7 MD |
2922 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2923 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2924 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2925 | } |
8b97fd42 MD |
2926 | } |
2927 | ||
d83004aa JD |
2928 | /* |
2929 | * Write the metadata to the metadata cache. | |
2930 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2931 | * The metadata cache lock protects us from concurrent read access from |
2932 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2933 | * The content of the printf is printed as a single atomic metadata |
2934 | * transaction. | |
d83004aa | 2935 | */ |
a90917c3 | 2936 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2937 | const char *fmt, ...) |
2938 | { | |
c099397a | 2939 | char *str; |
d83004aa | 2940 | size_t len; |
c099397a MD |
2941 | va_list ap; |
2942 | ||
585e5dcc | 2943 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2944 | |
2945 | va_start(ap, fmt); | |
2946 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2947 | va_end(ap); | |
2948 | if (!str) | |
2949 | return -ENOMEM; | |
2950 | ||
1ec3f75a | 2951 | len = strlen(str); |
3e75e2a7 | 2952 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2953 | if (session->metadata_cache->metadata_written + len > |
2954 | session->metadata_cache->cache_alloc) { | |
2955 | char *tmp_cache_realloc; | |
2956 | unsigned int tmp_cache_alloc_size; | |
2957 | ||
2958 | tmp_cache_alloc_size = max_t(unsigned int, | |
2959 | session->metadata_cache->cache_alloc + len, | |
2960 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2961 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2962 | if (!tmp_cache_realloc) |
2963 | goto err; | |
a606b6e8 ML |
2964 | if (session->metadata_cache->data) { |
2965 | memcpy(tmp_cache_realloc, | |
2966 | session->metadata_cache->data, | |
2967 | session->metadata_cache->cache_alloc); | |
2968 | vfree(session->metadata_cache->data); | |
2969 | } | |
2970 | ||
d83004aa JD |
2971 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2972 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2973 | } |
d83004aa JD |
2974 | memcpy(session->metadata_cache->data + |
2975 | session->metadata_cache->metadata_written, | |
2976 | str, len); | |
2977 | session->metadata_cache->metadata_written += len; | |
c099397a | 2978 | kfree(str); |
d83004aa | 2979 | |
d83004aa JD |
2980 | return 0; |
2981 | ||
2982 | err: | |
2983 | kfree(str); | |
2984 | return -ENOMEM; | |
c099397a MD |
2985 | } |
2986 | ||
f513b2bf MD |
2987 | static |
2988 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2989 | { | |
2990 | size_t i; | |
2991 | ||
2992 | for (i = 0; i < nesting; i++) { | |
2993 | int ret; | |
2994 | ||
2995 | ret = lttng_metadata_printf(session, " "); | |
2996 | if (ret) { | |
2997 | return ret; | |
2998 | } | |
2999 | } | |
3000 | return 0; | |
3001 | } | |
3002 | ||
ceabb767 MD |
3003 | static |
3004 | int lttng_field_name_statedump(struct lttng_session *session, | |
437d5aa5 | 3005 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3006 | size_t nesting) |
3007 | { | |
3008 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3009 | } | |
3010 | ||
3011 | static | |
3012 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3013 | const struct lttng_kernel_type_integer *type, |
3014 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3015 | size_t nesting) |
3016 | { | |
3017 | int ret; | |
3018 | ||
ceabb767 MD |
3019 | ret = print_tabs(session, nesting); |
3020 | if (ret) | |
3021 | return ret; | |
3022 | ret = lttng_metadata_printf(session, | |
3023 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3024 | type->size, |
3025 | type->alignment, | |
3026 | type->signedness, | |
3027 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3028 | ? "none" |
437d5aa5 | 3029 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3030 | ? "UTF8" |
3031 | : "ASCII", | |
437d5aa5 | 3032 | type->base, |
ceabb767 | 3033 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3034 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3035 | #else |
437d5aa5 | 3036 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3037 | #endif |
3038 | ); | |
3039 | return ret; | |
3040 | } | |
3041 | ||
f513b2bf MD |
3042 | /* |
3043 | * Must be called with sessions_mutex held. | |
3044 | */ | |
3045 | static | |
3046 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3047 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3048 | size_t nesting) |
3049 | { | |
3050 | int ret; | |
3051 | uint32_t i, nr_fields; | |
ceabb767 MD |
3052 | unsigned int alignment; |
3053 | ||
f513b2bf MD |
3054 | ret = print_tabs(session, nesting); |
3055 | if (ret) | |
3056 | return ret; | |
3057 | ret = lttng_metadata_printf(session, | |
3058 | "struct {\n"); | |
3059 | if (ret) | |
3060 | return ret; | |
437d5aa5 | 3061 | nr_fields = type->nr_fields; |
f513b2bf | 3062 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3063 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3064 | |
437d5aa5 | 3065 | iter_field = type->fields[i]; |
f513b2bf MD |
3066 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3067 | if (ret) | |
3068 | return ret; | |
3069 | } | |
3070 | ret = print_tabs(session, nesting); | |
3071 | if (ret) | |
3072 | return ret; | |
437d5aa5 | 3073 | alignment = type->alignment; |
ceabb767 MD |
3074 | if (alignment) { |
3075 | ret = lttng_metadata_printf(session, | |
3076 | "} align(%u)", | |
3077 | alignment); | |
3078 | } else { | |
3079 | ret = lttng_metadata_printf(session, | |
3080 | "}"); | |
3081 | } | |
f513b2bf MD |
3082 | return ret; |
3083 | } | |
3084 | ||
3085 | /* | |
3086 | * Must be called with sessions_mutex held. | |
3087 | */ | |
3088 | static | |
ceabb767 | 3089 | int _lttng_struct_field_statedump(struct lttng_session *session, |
437d5aa5 | 3090 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3091 | size_t nesting) |
3092 | { | |
3093 | int ret; | |
3094 | ||
3095 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3096 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3097 | if (ret) |
3098 | return ret; | |
ceabb767 | 3099 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3100 | } |
3101 | ||
65c85aa6 MD |
3102 | /* |
3103 | * Must be called with sessions_mutex held. | |
3104 | */ | |
3105 | static | |
3106 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3107 | const struct lttng_kernel_type_variant *type, |
65c85aa6 MD |
3108 | size_t nesting) |
3109 | { | |
3110 | int ret; | |
3111 | uint32_t i, nr_choices; | |
3112 | ||
ceabb767 MD |
3113 | /* |
3114 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3115 | */ | |
437d5aa5 | 3116 | if (type->alignment != 0) |
ceabb767 | 3117 | return -EINVAL; |
65c85aa6 MD |
3118 | ret = print_tabs(session, nesting); |
3119 | if (ret) | |
3120 | return ret; | |
3121 | ret = lttng_metadata_printf(session, | |
3122 | "variant <_%s> {\n", | |
437d5aa5 | 3123 | type->tag_name); |
65c85aa6 MD |
3124 | if (ret) |
3125 | return ret; | |
437d5aa5 | 3126 | nr_choices = type->nr_choices; |
65c85aa6 | 3127 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3128 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3129 | |
437d5aa5 | 3130 | iter_field = type->choices[i]; |
65c85aa6 MD |
3131 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3132 | if (ret) | |
3133 | return ret; | |
3134 | } | |
3135 | ret = print_tabs(session, nesting); | |
3136 | if (ret) | |
3137 | return ret; | |
3138 | ret = lttng_metadata_printf(session, | |
3139 | "}"); | |
3140 | return ret; | |
3141 | } | |
3142 | ||
3143 | /* | |
3144 | * Must be called with sessions_mutex held. | |
3145 | */ | |
3146 | static | |
ceabb767 | 3147 | int _lttng_variant_field_statedump(struct lttng_session *session, |
437d5aa5 | 3148 | const struct lttng_kernel_event_field *field, |
65c85aa6 MD |
3149 | size_t nesting) |
3150 | { | |
3151 | int ret; | |
3152 | ||
3153 | ret = _lttng_variant_type_statedump(session, | |
437d5aa5 | 3154 | lttng_kernel_get_type_variant(field->type), nesting); |
65c85aa6 MD |
3155 | if (ret) |
3156 | return ret; | |
ceabb767 | 3157 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3158 | } |
3159 | ||
f513b2bf MD |
3160 | /* |
3161 | * Must be called with sessions_mutex held. | |
3162 | */ | |
3163 | static | |
ceabb767 | 3164 | int _lttng_array_field_statedump(struct lttng_session *session, |
437d5aa5 | 3165 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3166 | size_t nesting) |
3167 | { | |
3168 | int ret; | |
437d5aa5 MD |
3169 | const struct lttng_kernel_type_array *array_type; |
3170 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3171 | |
437d5aa5 MD |
3172 | array_type = lttng_kernel_get_type_array(field->type); |
3173 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3174 | |
437d5aa5 | 3175 | if (array_type->alignment) { |
ceabb767 | 3176 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3177 | if (ret) |
3178 | return ret; | |
ceabb767 MD |
3179 | ret = lttng_metadata_printf(session, |
3180 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3181 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3182 | field->name); |
3183 | if (ret) | |
3184 | return ret; | |
3185 | } | |
3186 | /* | |
3187 | * Nested compound types: Only array of structures and variants are | |
3188 | * currently supported. | |
3189 | */ | |
437d5aa5 | 3190 | elem_type = array_type->elem_type; |
12bb2edb MD |
3191 | switch (elem_type->type) { |
3192 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3193 | case lttng_kernel_type_struct: |
3194 | case lttng_kernel_type_variant: | |
3195 | ret = _lttng_type_statedump(session, elem_type, | |
3196 | array_type->encoding, nesting); | |
65c85aa6 MD |
3197 | if (ret) |
3198 | return ret; | |
3199 | break; | |
ceabb767 | 3200 | |
f513b2bf MD |
3201 | default: |
3202 | return -EINVAL; | |
3203 | } | |
3204 | ret = lttng_metadata_printf(session, | |
3205 | " _%s[%u];\n", | |
3206 | field->name, | |
437d5aa5 | 3207 | array_type->length); |
f513b2bf MD |
3208 | return ret; |
3209 | } | |
3210 | ||
3211 | /* | |
3212 | * Must be called with sessions_mutex held. | |
3213 | */ | |
3214 | static | |
ceabb767 | 3215 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
437d5aa5 | 3216 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3217 | size_t nesting) |
3218 | { | |
3219 | int ret; | |
3220 | const char *length_name; | |
437d5aa5 MD |
3221 | const struct lttng_kernel_type_sequence *sequence_type; |
3222 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3223 | |
437d5aa5 MD |
3224 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3225 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3226 | |
437d5aa5 | 3227 | length_name = sequence_type->length_name; |
ceabb767 | 3228 | |
437d5aa5 | 3229 | if (sequence_type->alignment) { |
ceabb767 | 3230 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3231 | if (ret) |
3232 | return ret; | |
ceabb767 MD |
3233 | ret = lttng_metadata_printf(session, |
3234 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3235 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3236 | field->name); |
3237 | if (ret) | |
3238 | return ret; | |
3239 | } | |
3240 | ||
3241 | /* | |
3242 | * Nested compound types: Only array of structures and variants are | |
3243 | * currently supported. | |
3244 | */ | |
437d5aa5 | 3245 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3246 | switch (elem_type->type) { |
3247 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3248 | case lttng_kernel_type_struct: |
3249 | case lttng_kernel_type_variant: | |
3250 | ret = _lttng_type_statedump(session, elem_type, | |
3251 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3252 | if (ret) |
3253 | return ret; | |
3254 | break; | |
ceabb767 | 3255 | |
f513b2bf MD |
3256 | default: |
3257 | return -EINVAL; | |
3258 | } | |
3259 | ret = lttng_metadata_printf(session, | |
3260 | " _%s[ _%s ];\n", | |
3261 | field->name, | |
437d5aa5 | 3262 | sequence_type->length_name); |
f513b2bf MD |
3263 | return ret; |
3264 | } | |
3265 | ||
141ddf28 MD |
3266 | /* |
3267 | * Must be called with sessions_mutex held. | |
3268 | */ | |
3269 | static | |
ceabb767 | 3270 | int _lttng_enum_type_statedump(struct lttng_session *session, |
437d5aa5 | 3271 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3272 | size_t nesting) |
3273 | { | |
d96a4a7a | 3274 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3275 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3276 | int ret; |
3277 | unsigned int i, nr_entries; | |
3278 | ||
437d5aa5 | 3279 | container_type = type->container_type; |
12bb2edb | 3280 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3281 | ret = -EINVAL; |
3282 | goto end; | |
3283 | } | |
437d5aa5 | 3284 | enum_desc = type->desc; |
141ddf28 MD |
3285 | nr_entries = enum_desc->nr_entries; |
3286 | ||
3287 | ret = print_tabs(session, nesting); | |
3288 | if (ret) | |
3289 | goto end; | |
ceabb767 MD |
3290 | ret = lttng_metadata_printf(session, "enum : "); |
3291 | if (ret) | |
3292 | goto end; | |
437d5aa5 MD |
3293 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3294 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3295 | if (ret) |
ceabb767 MD |
3296 | goto end; |
3297 | ret = lttng_metadata_printf(session, " {\n"); | |
3298 | if (ret) | |
3299 | goto end; | |
141ddf28 MD |
3300 | /* Dump all entries */ |
3301 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3302 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3303 | int j, len; |
3304 | ||
3305 | ret = print_tabs(session, nesting + 1); | |
3306 | if (ret) | |
3307 | goto end; | |
3308 | ret = lttng_metadata_printf(session, | |
3309 | "\""); | |
3310 | if (ret) | |
3311 | goto end; | |
3312 | len = strlen(entry->string); | |
3313 | /* Escape the character '"' */ | |
3314 | for (j = 0; j < len; j++) { | |
3315 | char c = entry->string[j]; | |
3316 | ||
3317 | switch (c) { | |
3318 | case '"': | |
3319 | ret = lttng_metadata_printf(session, | |
3320 | "\\\""); | |
3321 | break; | |
3322 | case '\\': | |
3323 | ret = lttng_metadata_printf(session, | |
3324 | "\\\\"); | |
3325 | break; | |
3326 | default: | |
3327 | ret = lttng_metadata_printf(session, | |
3328 | "%c", c); | |
3329 | break; | |
3330 | } | |
3331 | if (ret) | |
3332 | goto end; | |
3333 | } | |
08ad1061 PP |
3334 | ret = lttng_metadata_printf(session, "\""); |
3335 | if (ret) | |
3336 | goto end; | |
3337 | ||
3338 | if (entry->options.is_auto) { | |
3339 | ret = lttng_metadata_printf(session, ",\n"); | |
3340 | if (ret) | |
3341 | goto end; | |
141ddf28 | 3342 | } else { |
7c559490 MD |
3343 | ret = lttng_metadata_printf(session, |
3344 | " = "); | |
3345 | if (ret) | |
3346 | goto end; | |
3347 | if (entry->start.signedness) | |
141ddf28 | 3348 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3349 | "%lld", (long long) entry->start.value); |
3350 | else | |
3351 | ret = lttng_metadata_printf(session, | |
3352 | "%llu", entry->start.value); | |
3353 | if (ret) | |
3354 | goto end; | |
3355 | if (entry->start.signedness == entry->end.signedness && | |
3356 | entry->start.value | |
3357 | == entry->end.value) { | |
141ddf28 | 3358 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3359 | ",\n"); |
3360 | } else { | |
3361 | if (entry->end.signedness) { | |
3362 | ret = lttng_metadata_printf(session, | |
3363 | " ... %lld,\n", | |
3364 | (long long) entry->end.value); | |
3365 | } else { | |
3366 | ret = lttng_metadata_printf(session, | |
3367 | " ... %llu,\n", | |
3368 | entry->end.value); | |
3369 | } | |
141ddf28 | 3370 | } |
7c559490 MD |
3371 | if (ret) |
3372 | goto end; | |
141ddf28 | 3373 | } |
141ddf28 MD |
3374 | } |
3375 | ret = print_tabs(session, nesting); | |
3376 | if (ret) | |
3377 | goto end; | |
ceabb767 | 3378 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3379 | end: |
3380 | return ret; | |
3381 | } | |
3382 | ||
d83004aa JD |
3383 | /* |
3384 | * Must be called with sessions_mutex held. | |
3385 | */ | |
c099397a | 3386 | static |
ceabb767 | 3387 | int _lttng_enum_field_statedump(struct lttng_session *session, |
437d5aa5 | 3388 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3389 | size_t nesting) |
3390 | { | |
3391 | int ret; | |
437d5aa5 | 3392 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3393 | |
437d5aa5 MD |
3394 | enum_type = lttng_kernel_get_type_enum(field->type); |
3395 | WARN_ON_ONCE(!enum_type); | |
3396 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3397 | if (ret) |
3398 | return ret; | |
3399 | return lttng_field_name_statedump(session, field, nesting); | |
3400 | } | |
3401 | ||
3402 | static | |
3403 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3404 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3405 | size_t nesting) |
3406 | { | |
3407 | int ret; | |
3408 | ||
437d5aa5 MD |
3409 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3410 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3411 | if (ret) |
3412 | return ret; | |
3413 | return lttng_field_name_statedump(session, field, nesting); | |
3414 | } | |
3415 | ||
3416 | static | |
3417 | int _lttng_string_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3418 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3419 | size_t nesting) |
3420 | { | |
3421 | int ret; | |
3422 | ||
ceabb767 MD |
3423 | /* Default encoding is UTF8 */ |
3424 | ret = print_tabs(session, nesting); | |
3425 | if (ret) | |
3426 | return ret; | |
3427 | ret = lttng_metadata_printf(session, | |
3428 | "string%s", | |
437d5aa5 | 3429 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3430 | " { encoding = ASCII; }" : ""); |
3431 | return ret; | |
3432 | } | |
3433 | ||
3434 | static | |
3435 | int _lttng_string_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3436 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3437 | size_t nesting) |
ceabb767 | 3438 | { |
437d5aa5 | 3439 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3440 | int ret; |
3441 | ||
437d5aa5 MD |
3442 | string_type = lttng_kernel_get_type_string(field->type); |
3443 | WARN_ON_ONCE(!string_type); | |
3444 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3445 | if (ret) |
3446 | return ret; | |
3447 | return lttng_field_name_statedump(session, field, nesting); | |
3448 | } | |
3449 | ||
3450 | /* | |
3451 | * Must be called with sessions_mutex held. | |
3452 | */ | |
3453 | static | |
3454 | int _lttng_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3455 | const struct lttng_kernel_type_common *type, |
3456 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3457 | size_t nesting) |
c099397a | 3458 | { |
c099397a | 3459 | int ret = 0; |
c099397a | 3460 | |
12bb2edb MD |
3461 | switch (type->type) { |
3462 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3463 | ret = _lttng_integer_type_statedump(session, |
3464 | lttng_kernel_get_type_integer(type), | |
3465 | parent_encoding, nesting); | |
8070f5c0 | 3466 | break; |
437d5aa5 MD |
3467 | case lttng_kernel_type_enum: |
3468 | ret = _lttng_enum_type_statedump(session, | |
3469 | lttng_kernel_get_type_enum(type), | |
3470 | nesting); | |
8070f5c0 | 3471 | break; |
12bb2edb | 3472 | case lttng_kernel_type_string: |
437d5aa5 MD |
3473 | ret = _lttng_string_type_statedump(session, |
3474 | lttng_kernel_get_type_string(type), | |
3475 | nesting); | |
ceabb767 | 3476 | break; |
437d5aa5 MD |
3477 | case lttng_kernel_type_struct: |
3478 | ret = _lttng_struct_type_statedump(session, | |
3479 | lttng_kernel_get_type_struct(type), | |
3480 | nesting); | |
8070f5c0 | 3481 | break; |
437d5aa5 MD |
3482 | case lttng_kernel_type_variant: |
3483 | ret = _lttng_variant_type_statedump(session, | |
3484 | lttng_kernel_get_type_variant(type), | |
3485 | nesting); | |
ceabb767 MD |
3486 | break; |
3487 | ||
3488 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3489 | case lttng_kernel_type_array: |
3490 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3491 | default: |
3492 | WARN_ON_ONCE(1); | |
3493 | return -EINVAL; | |
8070f5c0 | 3494 | } |
ceabb767 MD |
3495 | return ret; |
3496 | } | |
8070f5c0 | 3497 | |
ceabb767 MD |
3498 | /* |
3499 | * Must be called with sessions_mutex held. | |
3500 | */ | |
3501 | static | |
3502 | int _lttng_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3503 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3504 | size_t nesting) |
3505 | { | |
3506 | int ret = 0; | |
27d2368e | 3507 | |
437d5aa5 | 3508 | switch (field->type->type) { |
12bb2edb | 3509 | case lttng_kernel_type_integer: |
ceabb767 MD |
3510 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3511 | break; | |
437d5aa5 | 3512 | case lttng_kernel_type_enum: |
ceabb767 | 3513 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3514 | break; |
12bb2edb | 3515 | case lttng_kernel_type_string: |
ceabb767 | 3516 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3517 | break; |
437d5aa5 | 3518 | case lttng_kernel_type_struct: |
ceabb767 | 3519 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3520 | break; |
437d5aa5 | 3521 | case lttng_kernel_type_array: |
ceabb767 | 3522 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3523 | break; |
437d5aa5 | 3524 | case lttng_kernel_type_sequence: |
ceabb767 | 3525 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3526 | break; |
437d5aa5 | 3527 | case lttng_kernel_type_variant: |
ceabb767 | 3528 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3529 | break; |
f513b2bf | 3530 | |
8070f5c0 MD |
3531 | default: |
3532 | WARN_ON_ONCE(1); | |
3533 | return -EINVAL; | |
3534 | } | |
3535 | return ret; | |
3536 | } | |
3537 | ||
3538 | static | |
a90917c3 | 3539 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
437d5aa5 | 3540 | struct lttng_kernel_ctx *ctx) |
8070f5c0 MD |
3541 | { |
3542 | int ret = 0; | |
3543 | int i; | |
3544 | ||
3545 | if (!ctx) | |
3546 | return 0; | |
3547 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3548 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3549 | |
437d5aa5 | 3550 | ret = _lttng_field_statedump(session, field->event_field, 2); |
8070f5c0 MD |
3551 | if (ret) |
3552 | return ret; | |
3553 | } | |
3554 | return ret; | |
3555 | } | |
3556 | ||
3557 | static | |
a90917c3 MD |
3558 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3559 | struct lttng_event *event) | |
8070f5c0 | 3560 | { |
437d5aa5 | 3561 | const struct lttng_kernel_event_desc *desc = event->desc; |
8070f5c0 MD |
3562 | int ret = 0; |
3563 | int i; | |
3564 | ||
3565 | for (i = 0; i < desc->nr_fields; i++) { | |
437d5aa5 | 3566 | const struct lttng_kernel_event_field *field = desc->fields[i]; |
8070f5c0 | 3567 | |
f513b2bf | 3568 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3569 | if (ret) |
3570 | return ret; | |
c099397a MD |
3571 | } |
3572 | return ret; | |
3573 | } | |
3574 | ||
d83004aa JD |
3575 | /* |
3576 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3577 | * The entire event metadata is printed as a single atomic metadata |
3578 | * transaction. | |
d83004aa | 3579 | */ |
c099397a | 3580 | static |
a90917c3 MD |
3581 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3582 | struct lttng_channel *chan, | |
3583 | struct lttng_event *event) | |
c099397a MD |
3584 | { |
3585 | int ret = 0; | |
3586 | ||
585e5dcc | 3587 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3588 | return 0; |
d83004aa | 3589 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3590 | return 0; |
3591 | ||
8b97fd42 MD |
3592 | lttng_metadata_begin(session); |
3593 | ||
c099397a MD |
3594 | ret = lttng_metadata_printf(session, |
3595 | "event {\n" | |
ae734547 | 3596 | " name = \"%s\";\n" |
c099397a | 3597 | " id = %u;\n" |
b9074a1b | 3598 | " stream_id = %u;\n", |
437d5aa5 | 3599 | event->desc->event_name, |
c099397a MD |
3600 | event->id, |
3601 | event->chan->id); | |
3602 | if (ret) | |
3603 | goto end; | |
3604 | ||
b9074a1b MD |
3605 | if (event->ctx) { |
3606 | ret = lttng_metadata_printf(session, | |
3607 | " context := struct {\n"); | |
3608 | if (ret) | |
3609 | goto end; | |
3610 | } | |
a90917c3 | 3611 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3612 | if (ret) |
3613 | goto end; | |
b9074a1b MD |
3614 | if (event->ctx) { |
3615 | ret = lttng_metadata_printf(session, | |
3616 | " };\n"); | |
3617 | if (ret) | |
3618 | goto end; | |
3619 | } | |
8070f5c0 MD |
3620 | |
3621 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3622 | " fields := struct {\n" |
3623 | ); | |
3624 | if (ret) | |
3625 | goto end; | |
3626 | ||
a90917c3 | 3627 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3628 | if (ret) |
3629 | goto end; | |
3630 | ||
3631 | /* | |
3632 | * LTTng space reservation can only reserve multiples of the | |
3633 | * byte size. | |
3634 | */ | |
3635 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3636 | " };\n" |
3637 | "};\n\n"); | |
c099397a MD |
3638 | if (ret) |
3639 | goto end; | |
3640 | ||
c099397a MD |
3641 | event->metadata_dumped = 1; |
3642 | end: | |
8b97fd42 | 3643 | lttng_metadata_end(session); |
c099397a MD |
3644 | return ret; |
3645 | ||
3646 | } | |
3647 | ||
d83004aa JD |
3648 | /* |
3649 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3650 | * The entire channel metadata is printed as a single atomic metadata |
3651 | * transaction. | |
d83004aa | 3652 | */ |
c099397a | 3653 | static |
a90917c3 MD |
3654 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3655 | struct lttng_channel *chan) | |
c099397a MD |
3656 | { |
3657 | int ret = 0; | |
3658 | ||
585e5dcc | 3659 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3660 | return 0; |
d83004aa JD |
3661 | |
3662 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3663 | return 0; |
3664 | ||
8b97fd42 MD |
3665 | lttng_metadata_begin(session); |
3666 | ||
c099397a MD |
3667 | WARN_ON_ONCE(!chan->header_type); |
3668 | ret = lttng_metadata_printf(session, | |
3669 | "stream {\n" | |
3670 | " id = %u;\n" | |
9115fbdc | 3671 | " event.header := %s;\n" |
b9074a1b | 3672 | " packet.context := struct packet_context;\n", |
c099397a MD |
3673 | chan->id, |
3674 | chan->header_type == 1 ? "struct event_header_compact" : | |
3675 | "struct event_header_large"); | |
3676 | if (ret) | |
3677 | goto end; | |
3678 | ||
b9074a1b MD |
3679 | if (chan->ctx) { |
3680 | ret = lttng_metadata_printf(session, | |
3681 | " event.context := struct {\n"); | |
3682 | if (ret) | |
3683 | goto end; | |
3684 | } | |
a90917c3 | 3685 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3686 | if (ret) |
3687 | goto end; | |
b9074a1b MD |
3688 | if (chan->ctx) { |
3689 | ret = lttng_metadata_printf(session, | |
3690 | " };\n"); | |
3691 | if (ret) | |
3692 | goto end; | |
3693 | } | |
8070f5c0 MD |
3694 | |
3695 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3696 | "};\n\n"); |
8070f5c0 | 3697 | |
c099397a MD |
3698 | chan->metadata_dumped = 1; |
3699 | end: | |
8b97fd42 | 3700 | lttng_metadata_end(session); |
c099397a MD |
3701 | return ret; |
3702 | } | |
3703 | ||
d83004aa JD |
3704 | /* |
3705 | * Must be called with sessions_mutex held. | |
3706 | */ | |
9115fbdc | 3707 | static |
a90917c3 | 3708 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3709 | { |
3710 | return lttng_metadata_printf(session, | |
3711 | "struct packet_context {\n" | |
a3ccff4f MD |
3712 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3713 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3714 | " uint64_t content_size;\n" |
3715 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3716 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3717 | " unsigned long events_discarded;\n" |
9115fbdc | 3718 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3719 | "};\n\n" |
9115fbdc MD |
3720 | ); |
3721 | } | |
3722 | ||
3723 | /* | |
3724 | * Compact header: | |
3725 | * id: range: 0 - 30. | |
3726 | * id 31 is reserved to indicate an extended header. | |
3727 | * | |
3728 | * Large header: | |
3729 | * id: range: 0 - 65534. | |
3730 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3731 | * |
3732 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3733 | */ |
3734 | static | |
a90917c3 | 3735 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3736 | { |
3737 | return lttng_metadata_printf(session, | |
3738 | "struct event_header_compact {\n" | |
3739 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3740 | " variant <id> {\n" | |
3741 | " struct {\n" | |
a3ccff4f | 3742 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3743 | " } compact;\n" |
3744 | " struct {\n" | |
3745 | " uint32_t id;\n" | |
a3ccff4f | 3746 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3747 | " } extended;\n" |
3748 | " } v;\n" | |
3749 | "} align(%u);\n" | |
3750 | "\n" | |
3751 | "struct event_header_large {\n" | |
3752 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3753 | " variant <id> {\n" | |
3754 | " struct {\n" | |
a3ccff4f | 3755 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3756 | " } compact;\n" |
3757 | " struct {\n" | |
3758 | " uint32_t id;\n" | |
a3ccff4f | 3759 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3760 | " } extended;\n" |
3761 | " } v;\n" | |
3762 | "} align(%u);\n\n", | |
a90917c3 MD |
3763 | lttng_alignof(uint32_t) * CHAR_BIT, |
3764 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3765 | ); |
3766 | } | |
3767 | ||
a3ccff4f MD |
3768 | /* |
3769 | * Approximation of NTP time of day to clock monotonic correlation, | |
3770 | * taken at start of trace. | |
3771 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3772 | * in future versions. | |
5283350b MD |
3773 | * This function may return a negative offset. It may happen if the |
3774 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3775 | * |
3776 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3777 | * y2038 compliant. | |
a3ccff4f MD |
3778 | */ |
3779 | static | |
8967b2a3 | 3780 | int64_t measure_clock_offset(void) |
a3ccff4f | 3781 | { |
dcb93448 | 3782 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3783 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3784 | int64_t offset; |
a3ccff4f | 3785 | unsigned long flags; |
3636085f MJ |
3786 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3787 | struct timespec64 rts = { 0, 0 }; | |
3788 | #else | |
3789 | struct timespec rts = { 0, 0 }; | |
3790 | #endif | |
a3ccff4f MD |
3791 | |
3792 | /* Disable interrupts to increase correlation precision. */ | |
3793 | local_irq_save(flags); | |
3794 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3795 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3796 | ktime_get_real_ts64(&rts); | |
3797 | #else | |
216b6baa | 3798 | getnstimeofday(&rts); |
3636085f | 3799 | #endif |
a3ccff4f MD |
3800 | monotonic[1] = trace_clock_read64(); |
3801 | local_irq_restore(flags); | |
3802 | ||
dcb93448 | 3803 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3804 | realtime = (uint64_t) rts.tv_sec * tcf; |
3805 | if (tcf == NSEC_PER_SEC) { | |
3806 | realtime += rts.tv_nsec; | |
3807 | } else { | |
3808 | uint64_t n = rts.tv_nsec * tcf; | |
3809 | ||
3810 | do_div(n, NSEC_PER_SEC); | |
3811 | realtime += n; | |
3812 | } | |
dcb93448 | 3813 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3814 | return offset; |
3815 | } | |
3816 | ||
3eb95be4 JR |
3817 | static |
3818 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3819 | { | |
0f3eaad4 | 3820 | int ret = 0; |
3eb95be4 JR |
3821 | size_t i; |
3822 | char cur; | |
3823 | ||
3824 | i = 0; | |
3825 | cur = string[i]; | |
3826 | while (cur != '\0') { | |
3827 | switch (cur) { | |
3828 | case '\n': | |
3829 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3830 | break; | |
3831 | case '\\': | |
3832 | case '"': | |
3833 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3834 | if (ret) | |
3835 | goto error; | |
3836 | /* We still print the current char */ | |
3837 | /* Fallthrough */ | |
3838 | default: | |
3839 | ret = lttng_metadata_printf(session, "%c", cur); | |
3840 | break; | |
3841 | } | |
3842 | ||
3843 | if (ret) | |
3844 | goto error; | |
3845 | ||
3846 | cur = string[++i]; | |
3847 | } | |
3848 | error: | |
3849 | return ret; | |
3850 | } | |
3851 | ||
3852 | static | |
1c88f269 JR |
3853 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3854 | const char *field_value) | |
3eb95be4 JR |
3855 | { |
3856 | int ret; | |
3857 | ||
1c88f269 | 3858 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3859 | if (ret) |
3860 | goto error; | |
3861 | ||
1c88f269 | 3862 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3863 | if (ret) |
3864 | goto error; | |
3865 | ||
3866 | ret = lttng_metadata_printf(session, "\";\n"); | |
3867 | ||
3868 | error: | |
3869 | return ret; | |
3870 | } | |
3871 | ||
c099397a MD |
3872 | /* |
3873 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3874 | * Must be called with sessions_mutex held. |
c099397a MD |
3875 | */ |
3876 | static | |
a90917c3 | 3877 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3878 | { |
30bdb6e4 | 3879 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3880 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3881 | const char *product_uuid; |
a90917c3 MD |
3882 | struct lttng_channel *chan; |
3883 | struct lttng_event *event; | |
c099397a MD |
3884 | int ret = 0; |
3885 | ||
585e5dcc | 3886 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3887 | return 0; |
8b97fd42 MD |
3888 | |
3889 | lttng_metadata_begin(session); | |
3890 | ||
c099397a MD |
3891 | if (session->metadata_dumped) |
3892 | goto skip_session; | |
c099397a | 3893 | |
d793d5e1 | 3894 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3895 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3896 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3897 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3898 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3899 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3900 | |
3901 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3902 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3903 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3904 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3905 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3906 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3907 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3908 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3909 | "\n" |
3910 | "trace {\n" | |
3911 | " major = %u;\n" | |
3912 | " minor = %u;\n" | |
30bdb6e4 | 3913 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3914 | " byte_order = %s;\n" |
3915 | " packet.header := struct {\n" | |
3916 | " uint32_t magic;\n" | |
1ec3f75a | 3917 | " uint8_t uuid[16];\n" |
d793d5e1 | 3918 | " uint32_t stream_id;\n" |
5594698f | 3919 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3920 | " };\n" |
d793d5e1 | 3921 | "};\n\n", |
a90917c3 MD |
3922 | lttng_alignof(uint8_t) * CHAR_BIT, |
3923 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3924 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3925 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3926 | sizeof(unsigned long) * CHAR_BIT, |
3927 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3928 | CTF_SPEC_MAJOR, |
3929 | CTF_SPEC_MINOR, | |
d793d5e1 | 3930 | uuid_s, |
5214fa50 | 3931 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3932 | "be" |
3933 | #else | |
3934 | "le" | |
3935 | #endif | |
3936 | ); | |
3937 | if (ret) | |
3938 | goto end; | |
3939 | ||
99dc9597 MD |
3940 | ret = lttng_metadata_printf(session, |
3941 | "env {\n" | |
a6058143 | 3942 | " hostname = \"%s\";\n" |
c6c9e10f | 3943 | " domain = \"kernel\";\n" |
99dc9597 | 3944 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3945 | " kernel_release = \"%s\";\n" |
3946 | " kernel_version = \"%s\";\n" | |
3947 | " tracer_name = \"lttng-modules\";\n" | |
3948 | " tracer_major = %d;\n" | |
3949 | " tracer_minor = %d;\n" | |
3950 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3951 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3952 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3953 | utsname()->sysname, |
3954 | utsname()->release, | |
c6c9e10f MD |
3955 | utsname()->version, |
3956 | LTTNG_MODULES_MAJOR_VERSION, | |
3957 | LTTNG_MODULES_MINOR_VERSION, | |
3958 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3959 | ); |
3960 | if (ret) | |
3961 | goto end; | |
3962 | ||
1c88f269 JR |
3963 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3964 | if (ret) | |
3965 | goto end; | |
3966 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3967 | session->creation_time); | |
3eb95be4 JR |
3968 | if (ret) |
3969 | goto end; | |
3970 | ||
c88f762e GB |
3971 | /* Add the product UUID to the 'env' section */ |
3972 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3973 | if (product_uuid) { | |
3974 | ret = lttng_metadata_printf(session, | |
3975 | " product_uuid = \"%s\";\n", | |
3976 | product_uuid | |
3977 | ); | |
3978 | if (ret) | |
3979 | goto end; | |
3980 | } | |
3981 | ||
3982 | /* Close the 'env' section */ | |
3eb95be4 JR |
3983 | ret = lttng_metadata_printf(session, "};\n\n"); |
3984 | if (ret) | |
3985 | goto end; | |
3986 | ||
a3ccff4f MD |
3987 | ret = lttng_metadata_printf(session, |
3988 | "clock {\n" | |
2754583e MD |
3989 | " name = \"%s\";\n", |
3990 | trace_clock_name() | |
a82c63f1 MD |
3991 | ); |
3992 | if (ret) | |
3993 | goto end; | |
3994 | ||
3995 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3996 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3997 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3998 | clock_uuid_s |
3999 | ); | |
4000 | if (ret) | |
4001 | goto end; | |
4002 | } | |
4003 | ||
4004 | ret = lttng_metadata_printf(session, | |
2754583e | 4005 | " description = \"%s\";\n" |
a3ccff4f MD |
4006 | " freq = %llu; /* Frequency, in Hz */\n" |
4007 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4008 | " offset = %lld;\n" |
a3ccff4f | 4009 | "};\n\n", |
2754583e | 4010 | trace_clock_description(), |
a3ccff4f | 4011 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4012 | (long long) measure_clock_offset() |
a3ccff4f MD |
4013 | ); |
4014 | if (ret) | |
4015 | goto end; | |
4016 | ||
4017 | ret = lttng_metadata_printf(session, | |
4018 | "typealias integer {\n" | |
4019 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4020 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4021 | "} := uint27_clock_monotonic_t;\n" |
4022 | "\n" | |
4023 | "typealias integer {\n" | |
4024 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4025 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4026 | "} := uint32_clock_monotonic_t;\n" |
4027 | "\n" | |
4028 | "typealias integer {\n" | |
4029 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4030 | " map = clock.%s.value;\n" |
a3ccff4f | 4031 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4032 | trace_clock_name(), |
a3ccff4f | 4033 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4034 | trace_clock_name(), |
4035 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4036 | trace_clock_name() | |
a3ccff4f MD |
4037 | ); |
4038 | if (ret) | |
4039 | goto end; | |
4040 | ||
a90917c3 | 4041 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4042 | if (ret) |
4043 | goto end; | |
4044 | ||
a90917c3 | 4045 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4046 | if (ret) |
4047 | goto end; | |
4048 | ||
c099397a MD |
4049 | skip_session: |
4050 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4051 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4052 | if (ret) |
4053 | goto end; | |
4054 | } | |
4055 | ||
4056 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 4057 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
4058 | if (ret) |
4059 | goto end; | |
4060 | } | |
4061 | session->metadata_dumped = 1; | |
4062 | end: | |
8b97fd42 | 4063 | lttng_metadata_end(session); |
c099397a MD |
4064 | return ret; |
4065 | } | |
4066 | ||
c0e31d2e | 4067 | /** |
a90917c3 | 4068 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4069 | * @transport: transport structure |
4070 | * | |
4071 | * Registers a transport which can be used as output to extract the data out of | |
4072 | * LTTng. The module calling this registration function must ensure that no | |
4073 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4074 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4075 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4076 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4077 | * after its registration must it synchronize the TLBs. |
4078 | */ | |
a90917c3 | 4079 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4080 | { |
4081 | /* | |
4082 | * Make sure no page fault can be triggered by the module about to be | |
4083 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4084 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4085 | */ |
263b6c88 | 4086 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4087 | |
4088 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4089 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4090 | mutex_unlock(&sessions_mutex); |
4091 | } | |
a90917c3 | 4092 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4093 | |
4094 | /** | |
a90917c3 | 4095 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4096 | * @transport: transport structure |
4097 | */ | |
a90917c3 | 4098 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4099 | { |
4100 | mutex_lock(&sessions_mutex); | |
4101 | list_del(&transport->node); | |
4102 | mutex_unlock(&sessions_mutex); | |
4103 | } | |
a90917c3 | 4104 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4105 | |
a101fa10 MD |
4106 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4107 | { | |
4108 | /* | |
4109 | * Make sure no page fault can be triggered by the module about to be | |
4110 | * registered. We deal with this here so we don't have to call | |
4111 | * vmalloc_sync_mappings() in each module's init. | |
4112 | */ | |
4113 | wrapper_vmalloc_sync_mappings(); | |
4114 | ||
4115 | mutex_lock(&sessions_mutex); | |
4116 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4117 | mutex_unlock(&sessions_mutex); | |
4118 | } | |
4119 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4120 | ||
4121 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4122 | { | |
4123 | mutex_lock(&sessions_mutex); | |
4124 | list_del(&transport->node); | |
4125 | mutex_unlock(&sessions_mutex); | |
4126 | } | |
4127 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4128 | ||
5f4c791e | 4129 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4130 | |
4131 | enum cpuhp_state lttng_hp_prepare; | |
4132 | enum cpuhp_state lttng_hp_online; | |
4133 | ||
4134 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4135 | { | |
4136 | struct lttng_cpuhp_node *lttng_node; | |
4137 | ||
4138 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4139 | switch (lttng_node->component) { | |
4140 | case LTTNG_RING_BUFFER_FRONTEND: | |
4141 | return 0; | |
4142 | case LTTNG_RING_BUFFER_BACKEND: | |
4143 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4144 | case LTTNG_RING_BUFFER_ITER: | |
4145 | return 0; | |
4146 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4147 | return 0; | |
4148 | default: | |
4149 | return -EINVAL; | |
4150 | } | |
4151 | } | |
4152 | ||
4153 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4154 | { | |
4155 | struct lttng_cpuhp_node *lttng_node; | |
4156 | ||
4157 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4158 | switch (lttng_node->component) { | |
4159 | case LTTNG_RING_BUFFER_FRONTEND: | |
4160 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4161 | case LTTNG_RING_BUFFER_BACKEND: | |
4162 | return 0; | |
4163 | case LTTNG_RING_BUFFER_ITER: | |
4164 | return 0; | |
4165 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4166 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4167 | default: | |
4168 | return -EINVAL; | |
4169 | } | |
4170 | } | |
4171 | ||
4172 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4173 | { | |
4174 | struct lttng_cpuhp_node *lttng_node; | |
4175 | ||
4176 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4177 | switch (lttng_node->component) { | |
4178 | case LTTNG_RING_BUFFER_FRONTEND: | |
4179 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4180 | case LTTNG_RING_BUFFER_BACKEND: | |
4181 | return 0; | |
4182 | case LTTNG_RING_BUFFER_ITER: | |
4183 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4184 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4185 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4186 | default: | |
4187 | return -EINVAL; | |
4188 | } | |
4189 | } | |
4190 | ||
4191 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4192 | { | |
4193 | struct lttng_cpuhp_node *lttng_node; | |
4194 | ||
4195 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4196 | switch (lttng_node->component) { | |
4197 | case LTTNG_RING_BUFFER_FRONTEND: | |
4198 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4199 | case LTTNG_RING_BUFFER_BACKEND: | |
4200 | return 0; | |
4201 | case LTTNG_RING_BUFFER_ITER: | |
4202 | return 0; | |
4203 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4204 | return 0; | |
4205 | default: | |
4206 | return -EINVAL; | |
4207 | } | |
4208 | } | |
4209 | ||
4210 | static int __init lttng_init_cpu_hotplug(void) | |
4211 | { | |
4212 | int ret; | |
4213 | ||
4214 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4215 | lttng_hotplug_prepare, | |
4216 | lttng_hotplug_dead); | |
4217 | if (ret < 0) { | |
4218 | return ret; | |
4219 | } | |
4220 | lttng_hp_prepare = ret; | |
4221 | lttng_rb_set_hp_prepare(ret); | |
4222 | ||
4223 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4224 | lttng_hotplug_online, | |
4225 | lttng_hotplug_offline); | |
4226 | if (ret < 0) { | |
4227 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4228 | lttng_hp_prepare = 0; | |
4229 | return ret; | |
4230 | } | |
4231 | lttng_hp_online = ret; | |
4232 | lttng_rb_set_hp_online(ret); | |
4233 | ||
4234 | return 0; | |
4235 | } | |
4236 | ||
4237 | static void __exit lttng_exit_cpu_hotplug(void) | |
4238 | { | |
4239 | lttng_rb_set_hp_online(0); | |
4240 | cpuhp_remove_multi_state(lttng_hp_online); | |
4241 | lttng_rb_set_hp_prepare(0); | |
4242 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4243 | } | |
4244 | ||
5f4c791e | 4245 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4246 | static int lttng_init_cpu_hotplug(void) |
4247 | { | |
4248 | return 0; | |
4249 | } | |
4250 | static void lttng_exit_cpu_hotplug(void) | |
4251 | { | |
4252 | } | |
5f4c791e | 4253 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4254 | |
4255 | ||
a90917c3 | 4256 | static int __init lttng_events_init(void) |
4e3c1b9b | 4257 | { |
1c25284c MD |
4258 | int ret; |
4259 | ||
453b2495 JD |
4260 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4261 | if (ret) | |
4262 | return ret; | |
389d7070 | 4263 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4264 | if (ret) |
4265 | return ret; | |
4266 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4267 | if (ret) |
4268 | return ret; | |
4269 | ret = lttng_probes_init(); | |
389d7070 MD |
4270 | if (ret) |
4271 | return ret; | |
07dfc1d0 | 4272 | ret = lttng_context_init(); |
20591cf7 MD |
4273 | if (ret) |
4274 | return ret; | |
07dfc1d0 MD |
4275 | ret = lttng_tracepoint_init(); |
4276 | if (ret) | |
4277 | goto error_tp; | |
a90917c3 | 4278 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4279 | if (!event_cache) { |
4280 | ret = -ENOMEM; | |
dffef45d FD |
4281 | goto error_kmem_event; |
4282 | } | |
4283 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4284 | if (!event_notifier_cache) { | |
4285 | ret = -ENOMEM; | |
4286 | goto error_kmem_event_notifier; | |
20591cf7 | 4287 | } |
80996790 | 4288 | ret = lttng_abi_init(); |
02119ee5 MD |
4289 | if (ret) |
4290 | goto error_abi; | |
0c956676 MD |
4291 | ret = lttng_logger_init(); |
4292 | if (ret) | |
4293 | goto error_logger; | |
1e367326 MD |
4294 | ret = lttng_init_cpu_hotplug(); |
4295 | if (ret) | |
4296 | goto error_hotplug; | |
101215b7 | 4297 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4298 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4299 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4300 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4301 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4302 | LTTNG_VERSION_NAME, |
4303 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4304 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4305 | #else | |
4306 | "", | |
4307 | #endif | |
4308 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4309 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4310 | #else | |
4311 | ""); | |
4312 | #endif | |
4e3c1b9b | 4313 | return 0; |
0c956676 | 4314 | |
1e367326 MD |
4315 | error_hotplug: |
4316 | lttng_logger_exit(); | |
0c956676 MD |
4317 | error_logger: |
4318 | lttng_abi_exit(); | |
02119ee5 | 4319 | error_abi: |
dffef45d FD |
4320 | kmem_cache_destroy(event_notifier_cache); |
4321 | error_kmem_event_notifier: | |
1c25284c | 4322 | kmem_cache_destroy(event_cache); |
dffef45d | 4323 | error_kmem_event: |
20591cf7 | 4324 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4325 | error_tp: |
4326 | lttng_context_exit(); | |
101215b7 | 4327 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4328 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4329 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4330 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4331 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4332 | LTTNG_VERSION_NAME, |
4333 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4334 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4335 | #else | |
4336 | "", | |
4337 | #endif | |
4338 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4339 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4340 | #else | |
4341 | ""); | |
4342 | #endif | |
1c25284c | 4343 | return ret; |
4e3c1b9b MD |
4344 | } |
4345 | ||
a90917c3 | 4346 | module_init(lttng_events_init); |
11b5a3c2 | 4347 | |
a90917c3 | 4348 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4349 | { |
a90917c3 | 4350 | struct lttng_session *session, *tmpsession; |
92e94819 | 4351 | |
1e367326 | 4352 | lttng_exit_cpu_hotplug(); |
0c956676 | 4353 | lttng_logger_exit(); |
80996790 | 4354 | lttng_abi_exit(); |
92e94819 | 4355 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4356 | lttng_session_destroy(session); |
11b5a3c2 | 4357 | kmem_cache_destroy(event_cache); |
dffef45d | 4358 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4359 | lttng_tracepoint_exit(); |
07dfc1d0 | 4360 | lttng_context_exit(); |
101215b7 | 4361 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4362 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4363 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4364 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4365 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4366 | LTTNG_VERSION_NAME, |
4367 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4368 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4369 | #else | |
4370 | "", | |
4371 | #endif | |
4372 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4373 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4374 | #else | |
4375 | ""); | |
4376 | #endif | |
4e3c1b9b | 4377 | } |
92e94819 | 4378 | |
a90917c3 | 4379 | module_exit(lttng_events_exit); |
11b5a3c2 | 4380 | |
7ca11e77 | 4381 | #include <generated/patches.h> |
101215b7 MJ |
4382 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4383 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4384 | #endif | |
4385 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4386 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4387 | #endif | |
92e94819 MD |
4388 | MODULE_LICENSE("GPL and additional rights"); |
4389 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4390 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4391 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4392 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4393 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4394 | LTTNG_MODULES_EXTRAVERSION); |