Commit | Line | Data |
---|---|---|
4e3c1b9b | 1 | /* |
a90917c3 | 2 | * lttng-events.c |
4e3c1b9b | 3 | * |
4e3c1b9b | 4 | * Holds LTTng per-session event registry. |
17baffe2 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
4e3c1b9b MD |
21 | */ |
22 | ||
389d7070 MD |
23 | /* |
24 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
25 | * overrides a function with a define. | |
26 | */ | |
27 | #include "wrapper/page_alloc.h" | |
28 | ||
4e3c1b9b | 29 | #include <linux/module.h> |
c0e31d2e MD |
30 | #include <linux/mutex.h> |
31 | #include <linux/sched.h> | |
11b5a3c2 | 32 | #include <linux/slab.h> |
c099397a | 33 | #include <linux/jiffies.h> |
99dc9597 | 34 | #include <linux/utsname.h> |
abc0446a | 35 | #include <linux/err.h> |
7e6f9ef6 MD |
36 | #include <linux/seq_file.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/anon_inodes.h> | |
39 | #include "wrapper/file.h" | |
3c997079 MD |
40 | #include <linux/jhash.h> |
41 | ||
a864fb02 | 42 | #include "wrapper/uuid.h" |
b13f3ebe | 43 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
a82c63f1 | 44 | #include "wrapper/random.h" |
3a523f5b | 45 | #include "wrapper/tracepoint.h" |
f934e302 | 46 | #include "wrapper/list.h" |
b8590f40 | 47 | #include "lttng-kernel-version.h" |
a90917c3 MD |
48 | #include "lttng-events.h" |
49 | #include "lttng-tracer.h" | |
6dccd6c1 | 50 | #include "lttng-abi-old.h" |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
a90917c3 | 55 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
56 | /* |
57 | * Protect the sessions and metadata caches. | |
58 | */ | |
4e3c1b9b MD |
59 | static DEFINE_MUTEX(sessions_mutex); |
60 | static struct kmem_cache *event_cache; | |
61 | ||
3c997079 MD |
62 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
63 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
64 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
65 | ||
a90917c3 MD |
66 | static void _lttng_event_destroy(struct lttng_event *event); |
67 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
68 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 69 | static |
a90917c3 MD |
70 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
71 | struct lttng_channel *chan, | |
72 | struct lttng_event *event); | |
c099397a | 73 | static |
a90917c3 | 74 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
75 | static |
76 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 77 | |
c099397a | 78 | void synchronize_trace(void) |
abcca994 MD |
79 | { |
80 | synchronize_sched(); | |
b8590f40 MD |
81 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
82 | #ifdef CONFIG_PREEMPT_RT_FULL | |
83 | synchronize_rcu(); | |
84 | #endif | |
85 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
86 | #ifdef CONFIG_PREEMPT_RT |
87 | synchronize_rcu(); | |
88 | #endif | |
b8590f40 | 89 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
90 | } |
91 | ||
3c997079 MD |
92 | void lttng_lock_sessions(void) |
93 | { | |
94 | mutex_lock(&sessions_mutex); | |
95 | } | |
96 | ||
97 | void lttng_unlock_sessions(void) | |
98 | { | |
99 | mutex_unlock(&sessions_mutex); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Called with sessions lock held. | |
104 | */ | |
105 | int lttng_session_active(void) | |
106 | { | |
107 | struct lttng_session *iter; | |
108 | ||
109 | list_for_each_entry(iter, &sessions, list) { | |
110 | if (iter->active) | |
111 | return 1; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
a90917c3 | 116 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 117 | { |
a90917c3 | 118 | struct lttng_session *session; |
d83004aa | 119 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 120 | int i; |
4e3c1b9b MD |
121 | |
122 | mutex_lock(&sessions_mutex); | |
a90917c3 | 123 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 124 | if (!session) |
d83004aa | 125 | goto err; |
4e3c1b9b | 126 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 127 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 128 | uuid_le_gen(&session->uuid); |
d83004aa JD |
129 | |
130 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
131 | GFP_KERNEL); | |
132 | if (!metadata_cache) | |
133 | goto err_free_session; | |
134 | metadata_cache->data = kzalloc(METADATA_CACHE_DEFAULT_SIZE, | |
135 | GFP_KERNEL); | |
136 | if (!metadata_cache->data) | |
137 | goto err_free_cache; | |
138 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
139 | kref_init(&metadata_cache->refcount); | |
140 | session->metadata_cache = metadata_cache; | |
141 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
142 | memcpy(&metadata_cache->uuid, &session->uuid, |
143 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
144 | INIT_LIST_HEAD(&session->enablers_head); |
145 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
146 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
147 | list_add(&session->list, &sessions); |
148 | mutex_unlock(&sessions_mutex); | |
149 | return session; | |
d83004aa JD |
150 | |
151 | err_free_cache: | |
152 | kfree(metadata_cache); | |
153 | err_free_session: | |
154 | kfree(session); | |
155 | err: | |
156 | mutex_unlock(&sessions_mutex); | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | void metadata_cache_destroy(struct kref *kref) | |
161 | { | |
162 | struct lttng_metadata_cache *cache = | |
163 | container_of(kref, struct lttng_metadata_cache, refcount); | |
164 | kfree(cache->data); | |
165 | kfree(cache); | |
4e3c1b9b MD |
166 | } |
167 | ||
a90917c3 | 168 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 169 | { |
a90917c3 MD |
170 | struct lttng_channel *chan, *tmpchan; |
171 | struct lttng_event *event, *tmpevent; | |
d83004aa | 172 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 173 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 174 | int ret; |
4e3c1b9b MD |
175 | |
176 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 177 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
178 | list_for_each_entry(chan, &session->chan, list) { |
179 | ret = lttng_syscalls_unregister(chan); | |
180 | WARN_ON(ret); | |
181 | } | |
dda6a249 | 182 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 183 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
184 | WARN_ON(ret); |
185 | } | |
abcca994 | 186 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
187 | list_for_each_entry_safe(enabler, tmpenabler, |
188 | &session->enablers_head, node) | |
189 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 190 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 191 | _lttng_event_destroy(event); |
d83004aa JD |
192 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
193 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 194 | _lttng_channel_destroy(chan); |
d83004aa JD |
195 | } |
196 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
197 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
198 | if (session->pid_tracker) |
199 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 200 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
201 | list_del(&session->list); |
202 | mutex_unlock(&sessions_mutex); | |
203 | kfree(session); | |
204 | } | |
205 | ||
a90917c3 | 206 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
207 | { |
208 | int ret = 0; | |
a90917c3 | 209 | struct lttng_channel *chan; |
c0e31d2e MD |
210 | |
211 | mutex_lock(&sessions_mutex); | |
212 | if (session->active) { | |
213 | ret = -EBUSY; | |
214 | goto end; | |
215 | } | |
c099397a | 216 | |
3c997079 MD |
217 | /* Set transient enabler state to "enabled" */ |
218 | session->tstate = 1; | |
219 | ||
c099397a MD |
220 | /* |
221 | * Snapshot the number of events per channel to know the type of header | |
222 | * we need to use. | |
223 | */ | |
224 | list_for_each_entry(chan, &session->chan, list) { | |
225 | if (chan->header_type) | |
226 | continue; /* don't change it if session stop/restart */ | |
227 | if (chan->free_event_id < 31) | |
228 | chan->header_type = 1; /* compact */ | |
229 | else | |
230 | chan->header_type = 2; /* large */ | |
231 | } | |
232 | ||
3c997079 MD |
233 | /* We need to sync enablers with session before activation. */ |
234 | lttng_session_sync_enablers(session); | |
235 | ||
52fc2e1f | 236 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 237 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 238 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
239 | if (ret) { |
240 | ACCESS_ONCE(session->active) = 0; | |
241 | goto end; | |
242 | } | |
243 | ret = lttng_statedump_start(session); | |
360f38ea | 244 | if (ret) |
c099397a | 245 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
246 | end: |
247 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 248 | return ret; |
c0e31d2e MD |
249 | } |
250 | ||
a90917c3 | 251 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
252 | { |
253 | int ret = 0; | |
254 | ||
255 | mutex_lock(&sessions_mutex); | |
256 | if (!session->active) { | |
257 | ret = -EBUSY; | |
258 | goto end; | |
259 | } | |
52fc2e1f | 260 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
261 | |
262 | /* Set transient enabler state to "disabled" */ | |
263 | session->tstate = 0; | |
264 | lttng_session_sync_enablers(session); | |
c0e31d2e MD |
265 | end: |
266 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 267 | return ret; |
c0e31d2e MD |
268 | } |
269 | ||
a90917c3 | 270 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 271 | { |
3c997079 | 272 | int ret = 0; |
e64957da | 273 | |
3c997079 MD |
274 | mutex_lock(&sessions_mutex); |
275 | if (channel->channel_type == METADATA_CHANNEL) { | |
276 | ret = -EPERM; | |
277 | goto end; | |
278 | } | |
279 | if (channel->enabled) { | |
280 | ret = -EEXIST; | |
281 | goto end; | |
282 | } | |
283 | /* Set transient enabler state to "enabled" */ | |
284 | channel->tstate = 1; | |
285 | lttng_session_sync_enablers(channel->session); | |
286 | /* Set atomically the state to "enabled" */ | |
287 | ACCESS_ONCE(channel->enabled) = 1; | |
288 | end: | |
289 | mutex_unlock(&sessions_mutex); | |
290 | return ret; | |
e64957da MD |
291 | } |
292 | ||
a90917c3 | 293 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 294 | { |
3c997079 | 295 | int ret = 0; |
e64957da | 296 | |
3c997079 MD |
297 | mutex_lock(&sessions_mutex); |
298 | if (channel->channel_type == METADATA_CHANNEL) { | |
299 | ret = -EPERM; | |
300 | goto end; | |
301 | } | |
302 | if (!channel->enabled) { | |
303 | ret = -EEXIST; | |
304 | goto end; | |
305 | } | |
306 | /* Set atomically the state to "disabled" */ | |
307 | ACCESS_ONCE(channel->enabled) = 0; | |
308 | /* Set transient enabler state to "enabled" */ | |
309 | channel->tstate = 0; | |
310 | lttng_session_sync_enablers(channel->session); | |
311 | end: | |
312 | mutex_unlock(&sessions_mutex); | |
313 | return ret; | |
e64957da MD |
314 | } |
315 | ||
a90917c3 | 316 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 317 | { |
3c997079 | 318 | int ret = 0; |
e64957da | 319 | |
3c997079 MD |
320 | mutex_lock(&sessions_mutex); |
321 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
322 | ret = -EPERM; | |
323 | goto end; | |
324 | } | |
325 | if (event->enabled) { | |
326 | ret = -EEXIST; | |
327 | goto end; | |
328 | } | |
329 | ACCESS_ONCE(event->enabled) = 1; | |
330 | lttng_session_sync_enablers(event->chan->session); | |
331 | end: | |
332 | mutex_unlock(&sessions_mutex); | |
333 | return ret; | |
e64957da MD |
334 | } |
335 | ||
a90917c3 | 336 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 337 | { |
3c997079 | 338 | int ret = 0; |
e64957da | 339 | |
3c997079 MD |
340 | mutex_lock(&sessions_mutex); |
341 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
342 | ret = -EPERM; | |
343 | goto end; | |
344 | } | |
345 | if (!event->enabled) { | |
346 | ret = -EEXIST; | |
347 | goto end; | |
348 | } | |
349 | ACCESS_ONCE(event->enabled) = 0; | |
350 | lttng_session_sync_enablers(event->chan->session); | |
351 | end: | |
352 | mutex_unlock(&sessions_mutex); | |
353 | return ret; | |
e64957da MD |
354 | } |
355 | ||
a90917c3 | 356 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 357 | { |
a90917c3 | 358 | struct lttng_transport *transport; |
f3d01b96 | 359 | |
a90917c3 | 360 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
361 | if (!strcmp(transport->name, name)) |
362 | return transport; | |
363 | } | |
364 | return NULL; | |
365 | } | |
366 | ||
a90917c3 | 367 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
368 | const char *transport_name, |
369 | void *buf_addr, | |
4e3c1b9b MD |
370 | size_t subbuf_size, size_t num_subbuf, |
371 | unsigned int switch_timer_interval, | |
d83004aa JD |
372 | unsigned int read_timer_interval, |
373 | enum channel_type channel_type) | |
4e3c1b9b | 374 | { |
a90917c3 MD |
375 | struct lttng_channel *chan; |
376 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
377 | |
378 | mutex_lock(&sessions_mutex); | |
d83004aa | 379 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 380 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 381 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
382 | if (!transport) { |
383 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
384 | transport_name); | |
c0e31d2e | 385 | goto notransport; |
f3d01b96 | 386 | } |
a33c9927 MD |
387 | if (!try_module_get(transport->owner)) { |
388 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
389 | goto notransport; | |
390 | } | |
a90917c3 | 391 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 392 | if (!chan) |
c0e31d2e | 393 | goto nomem; |
4e3c1b9b | 394 | chan->session = session; |
05d32c64 | 395 | chan->id = session->free_chan_id++; |
3b731ab1 | 396 | chan->ops = &transport->ops; |
125b4df4 MD |
397 | /* |
398 | * Note: the channel creation op already writes into the packet | |
399 | * headers. Therefore the "chan" information used as input | |
400 | * should be already accessible. | |
401 | */ | |
5f5ddf01 MD |
402 | chan->chan = transport->ops.channel_create(transport_name, |
403 | chan, buf_addr, subbuf_size, num_subbuf, | |
404 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
405 | if (!chan->chan) |
406 | goto create_error; | |
3c997079 | 407 | chan->tstate = 1; |
e64957da | 408 | chan->enabled = 1; |
a33c9927 | 409 | chan->transport = transport; |
d83004aa | 410 | chan->channel_type = channel_type; |
4e3c1b9b MD |
411 | list_add(&chan->list, &session->chan); |
412 | mutex_unlock(&sessions_mutex); | |
413 | return chan; | |
414 | ||
f3d01b96 MD |
415 | create_error: |
416 | kfree(chan); | |
c0e31d2e | 417 | nomem: |
a33c9927 MD |
418 | if (transport) |
419 | module_put(transport->owner); | |
c0e31d2e | 420 | notransport: |
e5382b6d | 421 | active: |
4e3c1b9b MD |
422 | mutex_unlock(&sessions_mutex); |
423 | return NULL; | |
424 | } | |
425 | ||
426 | /* | |
d83004aa JD |
427 | * Only used internally at session destruction for per-cpu channels, and |
428 | * when metadata channel is released. | |
429 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 430 | */ |
aa7c23a9 | 431 | static |
a90917c3 | 432 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 433 | { |
11b5a3c2 | 434 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 435 | module_put(chan->transport->owner); |
4e3c1b9b | 436 | list_del(&chan->list); |
8070f5c0 | 437 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
438 | kfree(chan); |
439 | } | |
440 | ||
d83004aa JD |
441 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
442 | { | |
443 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
444 | ||
445 | /* Protect the metadata cache with the sessions_mutex. */ | |
446 | mutex_lock(&sessions_mutex); | |
447 | _lttng_channel_destroy(chan); | |
448 | mutex_unlock(&sessions_mutex); | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
451 | ||
452 | static | |
453 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
454 | { | |
455 | stream->finalized = 1; | |
456 | wake_up_interruptible(&stream->read_wait); | |
457 | } | |
458 | ||
e5382b6d MD |
459 | /* |
460 | * Supports event creation while tracing session is active. | |
3c997079 | 461 | * Needs to be called with sessions mutex held. |
e5382b6d | 462 | */ |
3c997079 MD |
463 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
464 | struct lttng_kernel_event *event_param, | |
465 | void *filter, | |
466 | const struct lttng_event_desc *event_desc, | |
467 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 468 | { |
3c997079 | 469 | struct lttng_session *session = chan->session; |
a90917c3 | 470 | struct lttng_event *event; |
3c997079 MD |
471 | const char *event_name; |
472 | struct hlist_head *head; | |
473 | size_t name_len; | |
474 | uint32_t hash; | |
3d084699 | 475 | int ret; |
4e3c1b9b | 476 | |
abc0446a | 477 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 478 | ret = -EMFILE; |
e5382b6d | 479 | goto full; |
abc0446a | 480 | } |
3c997079 MD |
481 | |
482 | switch (itype) { | |
483 | case LTTNG_KERNEL_TRACEPOINT: | |
484 | event_name = event_desc->name; | |
485 | break; | |
486 | case LTTNG_KERNEL_KPROBE: | |
487 | case LTTNG_KERNEL_KRETPROBE: | |
488 | case LTTNG_KERNEL_FUNCTION: | |
489 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 490 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
491 | event_name = event_param->name; |
492 | break; | |
493 | default: | |
494 | WARN_ON_ONCE(1); | |
495 | ret = -EINVAL; | |
496 | goto type_error; | |
497 | } | |
498 | name_len = strlen(event_name); | |
499 | hash = jhash(event_name, name_len, 0); | |
500 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 501 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
502 | WARN_ON_ONCE(!event->desc); |
503 | if (!strncmp(event->desc->name, event_name, | |
504 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
505 | && chan == event->chan) { | |
506 | ret = -EEXIST; | |
507 | goto exist; | |
abc0446a MD |
508 | } |
509 | } | |
3c997079 | 510 | |
11b5a3c2 | 511 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 512 | if (!event) { |
4cf0bf51 | 513 | ret = -ENOMEM; |
4e3c1b9b | 514 | goto cache_error; |
abc0446a | 515 | } |
4e3c1b9b MD |
516 | event->chan = chan; |
517 | event->filter = filter; | |
e5382b6d | 518 | event->id = chan->free_event_id++; |
3c997079 MD |
519 | event->instrumentation = itype; |
520 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 521 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
522 | INIT_LIST_HEAD(&event->enablers_ref_head); |
523 | ||
524 | switch (itype) { | |
ab2277d6 | 525 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
526 | /* Event will be enabled by enabler sync. */ |
527 | event->enabled = 0; | |
528 | event->registered = 0; | |
529 | event->desc = lttng_event_get(event_name); | |
abc0446a | 530 | if (!event->desc) { |
4cf0bf51 | 531 | ret = -ENOENT; |
d3dbe23c | 532 | goto register_error; |
abc0446a | 533 | } |
3c997079 MD |
534 | /* Populate lttng_event structure before event registration. */ |
535 | smp_wmb(); | |
baf20995 | 536 | break; |
ab2277d6 | 537 | case LTTNG_KERNEL_KPROBE: |
3c997079 MD |
538 | event->enabled = 1; |
539 | event->registered = 1; | |
540 | /* | |
541 | * Populate lttng_event structure before event | |
542 | * registration. | |
543 | */ | |
544 | smp_wmb(); | |
545 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
546 | event_param->u.kprobe.symbol_name, |
547 | event_param->u.kprobe.offset, | |
548 | event_param->u.kprobe.addr, | |
549 | event); | |
abc0446a | 550 | if (ret) { |
4cf0bf51 | 551 | ret = -EINVAL; |
d6d808f3 | 552 | goto register_error; |
abc0446a | 553 | } |
edeb3137 MD |
554 | ret = try_module_get(event->desc->owner); |
555 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 556 | break; |
7371f44c MD |
557 | case LTTNG_KERNEL_KRETPROBE: |
558 | { | |
a90917c3 | 559 | struct lttng_event *event_return; |
7371f44c MD |
560 | |
561 | /* kretprobe defines 2 events */ | |
3c997079 MD |
562 | event->enabled = 1; |
563 | event->registered = 1; | |
7371f44c MD |
564 | event_return = |
565 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 566 | if (!event_return) { |
4cf0bf51 | 567 | ret = -ENOMEM; |
7371f44c | 568 | goto register_error; |
abc0446a | 569 | } |
7371f44c MD |
570 | event_return->chan = chan; |
571 | event_return->filter = filter; | |
572 | event_return->id = chan->free_event_id++; | |
573 | event_return->enabled = 1; | |
3c997079 MD |
574 | event_return->registered = 1; |
575 | event_return->instrumentation = itype; | |
7371f44c | 576 | /* |
a90917c3 | 577 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
578 | */ |
579 | smp_wmb(); | |
3c997079 | 580 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
581 | event_param->u.kretprobe.symbol_name, |
582 | event_param->u.kretprobe.offset, | |
583 | event_param->u.kretprobe.addr, | |
584 | event, event_return); | |
585 | if (ret) { | |
586 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 587 | ret = -EINVAL; |
7371f44c MD |
588 | goto register_error; |
589 | } | |
590 | /* Take 2 refs on the module: one per event. */ | |
591 | ret = try_module_get(event->desc->owner); | |
592 | WARN_ON_ONCE(!ret); | |
593 | ret = try_module_get(event->desc->owner); | |
594 | WARN_ON_ONCE(!ret); | |
a90917c3 | 595 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 596 | event_return); |
abc0446a | 597 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
598 | if (ret) { |
599 | kmem_cache_free(event_cache, event_return); | |
600 | module_put(event->desc->owner); | |
601 | module_put(event->desc->owner); | |
602 | goto statedump_error; | |
603 | } | |
604 | list_add(&event_return->list, &chan->session->events); | |
605 | break; | |
606 | } | |
ab2277d6 | 607 | case LTTNG_KERNEL_FUNCTION: |
3c997079 MD |
608 | event->enabled = 1; |
609 | event->registered = 1; | |
610 | /* | |
611 | * Populate lttng_event structure before event | |
612 | * registration. | |
613 | */ | |
614 | smp_wmb(); | |
615 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
616 | event_param->u.ftrace.symbol_name, |
617 | event); | |
abc0446a | 618 | if (ret) { |
e0a7a7c4 | 619 | goto register_error; |
abc0446a | 620 | } |
edeb3137 MD |
621 | ret = try_module_get(event->desc->owner); |
622 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 623 | break; |
1ec65de1 | 624 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 625 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
626 | event->enabled = 1; |
627 | event->registered = 0; | |
628 | event->desc = event_desc; | |
abc0446a | 629 | if (!event->desc) { |
4cf0bf51 | 630 | ret = -EINVAL; |
259b6cb3 | 631 | goto register_error; |
abc0446a | 632 | } |
1ec65de1 | 633 | break; |
baf20995 MD |
634 | default: |
635 | WARN_ON_ONCE(1); | |
4cf0bf51 | 636 | ret = -EINVAL; |
df07930b | 637 | goto register_error; |
baf20995 | 638 | } |
a90917c3 | 639 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
640 | WARN_ON_ONCE(ret > 0); |
641 | if (ret) { | |
c099397a | 642 | goto statedump_error; |
abc0446a | 643 | } |
3c997079 | 644 | hlist_add_head(&event->hlist, head); |
dda6a249 | 645 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
646 | return event; |
647 | ||
c099397a | 648 | statedump_error: |
259b6cb3 | 649 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 650 | register_error: |
11b5a3c2 | 651 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
652 | cache_error: |
653 | exist: | |
3c997079 | 654 | type_error: |
e5382b6d | 655 | full: |
4cf0bf51 | 656 | return ERR_PTR(ret); |
4e3c1b9b MD |
657 | } |
658 | ||
3c997079 MD |
659 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
660 | struct lttng_kernel_event *event_param, | |
661 | void *filter, | |
662 | const struct lttng_event_desc *event_desc, | |
663 | enum lttng_kernel_instrumentation itype) | |
664 | { | |
665 | struct lttng_event *event; | |
666 | ||
667 | mutex_lock(&sessions_mutex); | |
668 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
669 | itype); | |
670 | mutex_unlock(&sessions_mutex); | |
671 | return event; | |
672 | } | |
673 | ||
674 | /* Only used for tracepoints for now. */ | |
675 | static | |
676 | void register_event(struct lttng_event *event) | |
677 | { | |
678 | const struct lttng_event_desc *desc; | |
f127e61e | 679 | int ret = -EINVAL; |
3c997079 | 680 | |
3c997079 MD |
681 | if (event->registered) |
682 | return; | |
4ecb5ad5 | 683 | |
3c997079 | 684 | desc = event->desc; |
4ecb5ad5 MD |
685 | switch (event->instrumentation) { |
686 | case LTTNG_KERNEL_TRACEPOINT: | |
687 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
688 | desc->probe_callback, | |
689 | event); | |
690 | break; | |
691 | case LTTNG_KERNEL_SYSCALL: | |
692 | ret = lttng_syscall_filter_enable(event->chan, | |
693 | desc->name); | |
694 | break; | |
695 | case LTTNG_KERNEL_KPROBE: | |
696 | case LTTNG_KERNEL_KRETPROBE: | |
697 | case LTTNG_KERNEL_FUNCTION: | |
698 | case LTTNG_KERNEL_NOOP: | |
699 | ret = 0; | |
700 | break; | |
701 | default: | |
702 | WARN_ON_ONCE(1); | |
703 | } | |
3c997079 MD |
704 | if (!ret) |
705 | event->registered = 1; | |
706 | } | |
707 | ||
4e3c1b9b MD |
708 | /* |
709 | * Only used internally at session destruction. | |
710 | */ | |
a90917c3 | 711 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 712 | { |
4ecb5ad5 | 713 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
714 | int ret = -EINVAL; |
715 | ||
3c997079 MD |
716 | if (!event->registered) |
717 | return 0; | |
718 | ||
4ecb5ad5 | 719 | desc = event->desc; |
38d024ae | 720 | switch (event->instrumentation) { |
ab2277d6 | 721 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 722 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 723 | event->desc->probe_callback, |
11b5a3c2 | 724 | event); |
baf20995 | 725 | break; |
ab2277d6 | 726 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 727 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
728 | ret = 0; |
729 | break; | |
7371f44c MD |
730 | case LTTNG_KERNEL_KRETPROBE: |
731 | lttng_kretprobes_unregister(event); | |
732 | ret = 0; | |
733 | break; | |
ab2277d6 | 734 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
735 | lttng_ftrace_unregister(event); |
736 | ret = 0; | |
737 | break; | |
33a39a3c | 738 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
739 | ret = lttng_syscall_filter_disable(event->chan, |
740 | desc->name); | |
741 | break; | |
742 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
743 | ret = 0; |
744 | break; | |
baf20995 MD |
745 | default: |
746 | WARN_ON_ONCE(1); | |
747 | } | |
3c997079 MD |
748 | if (!ret) |
749 | event->registered = 0; | |
dda6a249 MD |
750 | return ret; |
751 | } | |
752 | ||
753 | /* | |
754 | * Only used internally at session destruction. | |
755 | */ | |
be066e6c | 756 | static |
a90917c3 | 757 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 758 | { |
edeb3137 MD |
759 | switch (event->instrumentation) { |
760 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 761 | lttng_event_put(event->desc); |
edeb3137 MD |
762 | break; |
763 | case LTTNG_KERNEL_KPROBE: | |
764 | module_put(event->desc->owner); | |
765 | lttng_kprobes_destroy_private(event); | |
766 | break; | |
7371f44c MD |
767 | case LTTNG_KERNEL_KRETPROBE: |
768 | module_put(event->desc->owner); | |
769 | lttng_kretprobes_destroy_private(event); | |
770 | break; | |
edeb3137 MD |
771 | case LTTNG_KERNEL_FUNCTION: |
772 | module_put(event->desc->owner); | |
773 | lttng_ftrace_destroy_private(event); | |
774 | break; | |
259b6cb3 | 775 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 776 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 777 | break; |
edeb3137 MD |
778 | default: |
779 | WARN_ON_ONCE(1); | |
780 | } | |
dda6a249 | 781 | list_del(&event->list); |
8070f5c0 | 782 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 783 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
784 | } |
785 | ||
e0130fab MD |
786 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
787 | { | |
788 | int ret; | |
789 | ||
790 | if (pid < -1) | |
791 | return -EINVAL; | |
792 | mutex_lock(&sessions_mutex); | |
793 | if (pid == -1) { | |
794 | /* track all pids: destroy tracker. */ | |
795 | if (session->pid_tracker) { | |
796 | struct lttng_pid_tracker *lpf; | |
797 | ||
798 | lpf = session->pid_tracker; | |
799 | rcu_assign_pointer(session->pid_tracker, NULL); | |
800 | synchronize_trace(); | |
801 | lttng_pid_tracker_destroy(lpf); | |
802 | } | |
803 | ret = 0; | |
804 | } else { | |
805 | if (!session->pid_tracker) { | |
806 | struct lttng_pid_tracker *lpf; | |
807 | ||
808 | lpf = lttng_pid_tracker_create(); | |
809 | if (!lpf) { | |
810 | ret = -ENOMEM; | |
811 | goto unlock; | |
812 | } | |
813 | ret = lttng_pid_tracker_add(lpf, pid); | |
814 | rcu_assign_pointer(session->pid_tracker, lpf); | |
815 | } else { | |
816 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
817 | } | |
818 | } | |
819 | unlock: | |
820 | mutex_unlock(&sessions_mutex); | |
821 | return ret; | |
822 | } | |
823 | ||
824 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
825 | { | |
826 | int ret; | |
827 | ||
828 | if (pid < -1) | |
829 | return -EINVAL; | |
830 | mutex_lock(&sessions_mutex); | |
831 | if (pid == -1) { | |
832 | /* untrack all pids: replace by empty tracker. */ | |
833 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
834 | struct lttng_pid_tracker *lpf; | |
835 | ||
836 | lpf = lttng_pid_tracker_create(); | |
837 | if (!lpf) { | |
838 | ret = -ENOMEM; | |
839 | goto unlock; | |
840 | } | |
841 | rcu_assign_pointer(session->pid_tracker, lpf); | |
842 | synchronize_trace(); | |
843 | if (old_lpf) | |
844 | lttng_pid_tracker_destroy(old_lpf); | |
845 | ret = 0; | |
846 | } else { | |
847 | if (!session->pid_tracker) { | |
848 | ret = -ENOENT; | |
849 | goto unlock; | |
850 | } | |
851 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
852 | } | |
853 | unlock: | |
854 | mutex_unlock(&sessions_mutex); | |
855 | return ret; | |
856 | } | |
857 | ||
7e6f9ef6 MD |
858 | static |
859 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
860 | { | |
861 | struct lttng_session *session = m->private; | |
862 | struct lttng_pid_tracker *lpf; | |
863 | struct lttng_pid_hash_node *e; | |
864 | int iter = 0, i; | |
865 | ||
866 | mutex_lock(&sessions_mutex); | |
867 | lpf = session->pid_tracker; | |
868 | if (lpf) { | |
869 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
870 | struct hlist_head *head = &lpf->pid_hash[i]; | |
871 | ||
f934e302 | 872 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
873 | if (iter++ >= *pos) |
874 | return e; | |
875 | } | |
876 | } | |
877 | } else { | |
878 | /* PID tracker disabled. */ | |
879 | if (iter >= *pos && iter == 0) { | |
880 | return session; /* empty tracker */ | |
881 | } | |
882 | iter++; | |
883 | } | |
884 | /* End of list */ | |
885 | return NULL; | |
886 | } | |
887 | ||
888 | /* Called with sessions_mutex held. */ | |
889 | static | |
890 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
891 | { | |
892 | struct lttng_session *session = m->private; | |
893 | struct lttng_pid_tracker *lpf; | |
894 | struct lttng_pid_hash_node *e; | |
895 | int iter = 0, i; | |
896 | ||
897 | (*ppos)++; | |
898 | lpf = session->pid_tracker; | |
899 | if (lpf) { | |
900 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
901 | struct hlist_head *head = &lpf->pid_hash[i]; | |
902 | ||
f934e302 | 903 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
904 | if (iter++ >= *ppos) |
905 | return e; | |
906 | } | |
907 | } | |
908 | } else { | |
909 | /* PID tracker disabled. */ | |
910 | if (iter >= *ppos && iter == 0) | |
911 | return session; /* empty tracker */ | |
912 | iter++; | |
913 | } | |
914 | ||
915 | /* End of list */ | |
916 | return NULL; | |
917 | } | |
918 | ||
919 | static | |
920 | void pid_list_stop(struct seq_file *m, void *p) | |
921 | { | |
922 | mutex_unlock(&sessions_mutex); | |
923 | } | |
924 | ||
925 | static | |
926 | int pid_list_show(struct seq_file *m, void *p) | |
927 | { | |
928 | int pid; | |
929 | ||
930 | if (p == m->private) { | |
931 | /* Tracker disabled. */ | |
932 | pid = -1; | |
933 | } else { | |
934 | const struct lttng_pid_hash_node *e = p; | |
935 | ||
936 | pid = lttng_pid_tracker_get_node_pid(e); | |
937 | } | |
938 | seq_printf(m, "process { pid = %d; };\n", pid); | |
939 | return 0; | |
940 | } | |
941 | ||
942 | static | |
943 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
944 | .start = pid_list_start, | |
945 | .next = pid_list_next, | |
946 | .stop = pid_list_stop, | |
947 | .show = pid_list_show, | |
948 | }; | |
949 | ||
950 | static | |
951 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
952 | { | |
953 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
954 | } | |
955 | ||
956 | static | |
957 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
958 | { | |
959 | struct seq_file *m = file->private_data; | |
960 | struct lttng_session *session = m->private; | |
961 | int ret; | |
962 | ||
963 | WARN_ON_ONCE(!session); | |
964 | ret = seq_release(inode, file); | |
965 | if (!ret && session) | |
966 | fput(session->file); | |
967 | return ret; | |
968 | } | |
969 | ||
970 | const struct file_operations lttng_tracker_pids_list_fops = { | |
971 | .owner = THIS_MODULE, | |
972 | .open = lttng_tracker_pids_list_open, | |
973 | .read = seq_read, | |
974 | .llseek = seq_lseek, | |
975 | .release = lttng_tracker_pids_list_release, | |
976 | }; | |
977 | ||
978 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
979 | { | |
980 | struct file *tracker_pids_list_file; | |
981 | struct seq_file *m; | |
982 | int file_fd, ret; | |
983 | ||
984 | file_fd = lttng_get_unused_fd(); | |
985 | if (file_fd < 0) { | |
986 | ret = file_fd; | |
987 | goto fd_error; | |
988 | } | |
989 | ||
990 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
991 | <tng_tracker_pids_list_fops, | |
992 | NULL, O_RDWR); | |
993 | if (IS_ERR(tracker_pids_list_file)) { | |
994 | ret = PTR_ERR(tracker_pids_list_file); | |
995 | goto file_error; | |
996 | } | |
997 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); | |
998 | if (ret < 0) | |
999 | goto open_error; | |
1000 | m = tracker_pids_list_file->private_data; | |
1001 | m->private = session; | |
1002 | fd_install(file_fd, tracker_pids_list_file); | |
1003 | atomic_long_inc(&session->file->f_count); | |
1004 | ||
1005 | return file_fd; | |
1006 | ||
1007 | open_error: | |
1008 | fput(tracker_pids_list_file); | |
1009 | file_error: | |
1010 | put_unused_fd(file_fd); | |
1011 | fd_error: | |
1012 | return ret; | |
1013 | } | |
1014 | ||
3c997079 MD |
1015 | /* |
1016 | * Enabler management. | |
1017 | */ | |
1018 | static | |
4ecb5ad5 MD |
1019 | int lttng_match_enabler_wildcard(const char *desc_name, |
1020 | const char *name) | |
3c997079 | 1021 | { |
3c997079 | 1022 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1023 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1024 | return 0; |
1025 | return 1; | |
1026 | } | |
1027 | ||
1028 | static | |
4ecb5ad5 MD |
1029 | int lttng_match_enabler_name(const char *desc_name, |
1030 | const char *name) | |
3c997079 | 1031 | { |
4ecb5ad5 | 1032 | if (strcmp(desc_name, name)) |
3c997079 MD |
1033 | return 0; |
1034 | return 1; | |
1035 | } | |
1036 | ||
1037 | static | |
1038 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1039 | struct lttng_enabler *enabler) | |
1040 | { | |
4ecb5ad5 MD |
1041 | const char *desc_name, *enabler_name; |
1042 | ||
1043 | enabler_name = enabler->event_param.name; | |
1044 | switch (enabler->event_param.instrumentation) { | |
1045 | case LTTNG_KERNEL_TRACEPOINT: | |
1046 | desc_name = desc->name; | |
1047 | break; | |
1048 | case LTTNG_KERNEL_SYSCALL: | |
1049 | desc_name = desc->name; | |
1050 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1051 | desc_name += strlen("compat_"); | |
1052 | if (!strncmp(desc_name, "syscall_exit_", | |
1053 | strlen("syscall_exit_"))) { | |
1054 | desc_name += strlen("syscall_exit_"); | |
1055 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1056 | strlen("syscall_entry_"))) { | |
1057 | desc_name += strlen("syscall_entry_"); | |
1058 | } else { | |
1059 | WARN_ON_ONCE(1); | |
1060 | return -EINVAL; | |
1061 | } | |
1062 | break; | |
1063 | default: | |
1064 | WARN_ON_ONCE(1); | |
1065 | return -EINVAL; | |
1066 | } | |
3c997079 MD |
1067 | switch (enabler->type) { |
1068 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1069 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1070 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1071 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1072 | default: |
1073 | return -EINVAL; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | static | |
1078 | int lttng_event_match_enabler(struct lttng_event *event, | |
1079 | struct lttng_enabler *enabler) | |
1080 | { | |
33a39a3c MD |
1081 | if (enabler->event_param.instrumentation != event->instrumentation) |
1082 | return 0; | |
3c997079 MD |
1083 | if (lttng_desc_match_enabler(event->desc, enabler) |
1084 | && event->chan == enabler->chan) | |
1085 | return 1; | |
1086 | else | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | static | |
1091 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1092 | struct lttng_enabler *enabler) | |
1093 | { | |
1094 | struct lttng_enabler_ref *enabler_ref; | |
1095 | ||
1096 | list_for_each_entry(enabler_ref, | |
1097 | &event->enablers_ref_head, node) { | |
1098 | if (enabler_ref->ref == enabler) | |
1099 | return enabler_ref; | |
1100 | } | |
1101 | return NULL; | |
1102 | } | |
1103 | ||
3c997079 | 1104 | static |
33a39a3c | 1105 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1106 | { |
1107 | struct lttng_session *session = enabler->chan->session; | |
1108 | struct lttng_probe_desc *probe_desc; | |
1109 | const struct lttng_event_desc *desc; | |
1110 | int i; | |
1111 | struct list_head *probe_list; | |
1112 | ||
1113 | probe_list = lttng_get_probe_list_head(); | |
1114 | /* | |
1115 | * For each probe event, if we find that a probe event matches | |
1116 | * our enabler, create an associated lttng_event if not | |
1117 | * already present. | |
1118 | */ | |
1119 | list_for_each_entry(probe_desc, probe_list, head) { | |
1120 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1121 | int found = 0; | |
1122 | struct hlist_head *head; | |
1123 | const char *event_name; | |
1124 | size_t name_len; | |
1125 | uint32_t hash; | |
1126 | struct lttng_event *event; | |
1127 | ||
1128 | desc = probe_desc->event_desc[i]; | |
1129 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1130 | continue; | |
1131 | event_name = desc->name; | |
1132 | name_len = strlen(event_name); | |
1133 | ||
1134 | /* | |
1135 | * Check if already created. | |
1136 | */ | |
1137 | hash = jhash(event_name, name_len, 0); | |
1138 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1139 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1140 | if (event->desc == desc |
1141 | && event->chan == enabler->chan) | |
1142 | found = 1; | |
1143 | } | |
1144 | if (found) | |
1145 | continue; | |
1146 | ||
1147 | /* | |
1148 | * We need to create an event for this | |
1149 | * event probe. | |
1150 | */ | |
1151 | event = _lttng_event_create(enabler->chan, | |
1152 | NULL, NULL, desc, | |
1153 | LTTNG_KERNEL_TRACEPOINT); | |
1154 | if (!event) { | |
1155 | printk(KERN_INFO "Unable to create event %s\n", | |
1156 | probe_desc->event_desc[i]->name); | |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | } | |
1161 | ||
33a39a3c MD |
1162 | static |
1163 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1164 | { | |
1165 | int ret; | |
1166 | ||
1167 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1168 | WARN_ON_ONCE(ret); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Create struct lttng_event if it is missing and present in the list of | |
1173 | * tracepoint probes. | |
1174 | * Should be called with sessions mutex held. | |
1175 | */ | |
1176 | static | |
1177 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1178 | { | |
1179 | switch (enabler->event_param.instrumentation) { | |
1180 | case LTTNG_KERNEL_TRACEPOINT: | |
1181 | lttng_create_tracepoint_if_missing(enabler); | |
1182 | break; | |
1183 | case LTTNG_KERNEL_SYSCALL: | |
1184 | lttng_create_syscall_if_missing(enabler); | |
1185 | break; | |
1186 | default: | |
1187 | WARN_ON_ONCE(1); | |
1188 | break; | |
1189 | } | |
1190 | } | |
1191 | ||
3c997079 MD |
1192 | /* |
1193 | * Create events associated with an enabler (if not already present), | |
1194 | * and add backward reference from the event to the enabler. | |
1195 | * Should be called with sessions mutex held. | |
1196 | */ | |
1197 | static | |
1198 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1199 | { | |
1200 | struct lttng_session *session = enabler->chan->session; | |
1201 | struct lttng_event *event; | |
1202 | ||
1203 | /* First ensure that probe events are created for this enabler. */ | |
1204 | lttng_create_event_if_missing(enabler); | |
1205 | ||
1206 | /* For each event matching enabler in session event list. */ | |
1207 | list_for_each_entry(event, &session->events, list) { | |
1208 | struct lttng_enabler_ref *enabler_ref; | |
1209 | ||
1210 | if (!lttng_event_match_enabler(event, enabler)) | |
1211 | continue; | |
1212 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1213 | if (!enabler_ref) { | |
1214 | /* | |
1215 | * If no backward ref, create it. | |
1216 | * Add backward ref from event to enabler. | |
1217 | */ | |
1218 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1219 | if (!enabler_ref) | |
1220 | return -ENOMEM; | |
1221 | enabler_ref->ref = enabler; | |
1222 | list_add(&enabler_ref->node, | |
1223 | &event->enablers_ref_head); | |
1224 | } | |
1225 | ||
f127e61e MD |
1226 | /* |
1227 | * Link filter bytecodes if not linked yet. | |
1228 | */ | |
1229 | lttng_enabler_event_link_bytecode(event, enabler); | |
1230 | ||
3c997079 MD |
1231 | /* TODO: merge event context. */ |
1232 | } | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Called at module load: connect the probe on all enablers matching | |
1238 | * this event. | |
1239 | * Called with sessions lock held. | |
1240 | */ | |
1241 | int lttng_fix_pending_events(void) | |
1242 | { | |
1243 | struct lttng_session *session; | |
1244 | ||
1245 | list_for_each_entry(session, &sessions, list) | |
1246 | lttng_session_lazy_sync_enablers(session); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1251 | struct lttng_kernel_event *event_param, | |
1252 | struct lttng_channel *chan) | |
1253 | { | |
1254 | struct lttng_enabler *enabler; | |
1255 | ||
1256 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1257 | if (!enabler) | |
1258 | return NULL; | |
1259 | enabler->type = type; | |
07dfc1d0 | 1260 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1261 | memcpy(&enabler->event_param, event_param, |
1262 | sizeof(enabler->event_param)); | |
1263 | enabler->chan = chan; | |
1264 | /* ctx left NULL */ | |
4fd19d8a | 1265 | enabler->enabled = 0; |
3c997079 MD |
1266 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1267 | mutex_lock(&sessions_mutex); | |
1268 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1269 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1270 | mutex_unlock(&sessions_mutex); | |
1271 | return enabler; | |
1272 | } | |
1273 | ||
1274 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1275 | { | |
1276 | mutex_lock(&sessions_mutex); | |
1277 | enabler->enabled = 1; | |
1278 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1279 | mutex_unlock(&sessions_mutex); | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1284 | { | |
1285 | mutex_lock(&sessions_mutex); | |
1286 | enabler->enabled = 0; | |
1287 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1288 | mutex_unlock(&sessions_mutex); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
07dfc1d0 MD |
1292 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1293 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1294 | { | |
1295 | struct lttng_filter_bytecode_node *bytecode_node; | |
1296 | uint32_t bytecode_len; | |
1297 | int ret; | |
1298 | ||
1299 | ret = get_user(bytecode_len, &bytecode->len); | |
1300 | if (ret) | |
1301 | return ret; | |
1302 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1303 | GFP_KERNEL); | |
1304 | if (!bytecode_node) | |
1305 | return -ENOMEM; | |
1306 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1307 | sizeof(*bytecode) + bytecode_len); | |
1308 | if (ret) | |
1309 | goto error_free; | |
1310 | bytecode_node->enabler = enabler; | |
1311 | /* Enforce length based on allocated size */ | |
1312 | bytecode_node->bc.len = bytecode_len; | |
1313 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1314 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1315 | return 0; | |
1316 | ||
1317 | error_free: | |
1318 | kfree(bytecode_node); | |
1319 | return ret; | |
1320 | } | |
1321 | ||
3c997079 MD |
1322 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1323 | struct lttng_kernel_context *context_param) | |
1324 | { | |
1325 | return -ENOSYS; | |
1326 | } | |
1327 | ||
1328 | static | |
1329 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1330 | { | |
07dfc1d0 MD |
1331 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1332 | ||
1333 | /* Destroy filter bytecode */ | |
1334 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1335 | &enabler->filter_bytecode_head, node) { | |
1336 | kfree(filter_node); | |
1337 | } | |
1338 | ||
3c997079 MD |
1339 | /* Destroy contexts */ |
1340 | lttng_destroy_context(enabler->ctx); | |
1341 | ||
1342 | list_del(&enabler->node); | |
1343 | kfree(enabler); | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * lttng_session_sync_enablers should be called just before starting a | |
1348 | * session. | |
1349 | * Should be called with sessions mutex held. | |
1350 | */ | |
1351 | static | |
1352 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1353 | { | |
1354 | struct lttng_enabler *enabler; | |
1355 | struct lttng_event *event; | |
1356 | ||
1357 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1358 | lttng_enabler_ref_events(enabler); | |
1359 | /* | |
1360 | * For each event, if at least one of its enablers is enabled, | |
1361 | * and its channel and session transient states are enabled, we | |
1362 | * enable the event, else we disable it. | |
1363 | */ | |
1364 | list_for_each_entry(event, &session->events, list) { | |
1365 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1366 | struct lttng_bytecode_runtime *runtime; |
1367 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1368 | |
4ecb5ad5 MD |
1369 | switch (event->instrumentation) { |
1370 | case LTTNG_KERNEL_TRACEPOINT: | |
1371 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1372 | /* Enable events */ |
1373 | list_for_each_entry(enabler_ref, | |
1374 | &event->enablers_ref_head, node) { | |
1375 | if (enabler_ref->ref->enabled) { | |
1376 | enabled = 1; | |
1377 | break; | |
1378 | } | |
1379 | } | |
4ecb5ad5 MD |
1380 | break; |
1381 | default: | |
3c997079 MD |
1382 | /* Not handled with lazy sync. */ |
1383 | continue; | |
1384 | } | |
1385 | /* | |
1386 | * Enabled state is based on union of enablers, with | |
1387 | * intesection of session and channel transient enable | |
1388 | * states. | |
1389 | */ | |
1390 | enabled = enabled && session->tstate && event->chan->tstate; | |
1391 | ||
1392 | ACCESS_ONCE(event->enabled) = enabled; | |
1393 | /* | |
1394 | * Sync tracepoint registration with event enabled | |
1395 | * state. | |
1396 | */ | |
1397 | if (enabled) { | |
1398 | register_event(event); | |
1399 | } else { | |
1400 | _lttng_event_unregister(event); | |
1401 | } | |
07dfc1d0 MD |
1402 | |
1403 | /* Check if has enablers without bytecode enabled */ | |
1404 | list_for_each_entry(enabler_ref, | |
1405 | &event->enablers_ref_head, node) { | |
1406 | if (enabler_ref->ref->enabled | |
1407 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1408 | has_enablers_without_bytecode = 1; | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | event->has_enablers_without_bytecode = | |
1413 | has_enablers_without_bytecode; | |
1414 | ||
1415 | /* Enable filters */ | |
1416 | list_for_each_entry(runtime, | |
f127e61e | 1417 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1418 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1419 | } |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Apply enablers to session events, adding events to session if need | |
1424 | * be. It is required after each modification applied to an active | |
1425 | * session, and right before session "start". | |
1426 | * "lazy" sync means we only sync if required. | |
1427 | * Should be called with sessions mutex held. | |
1428 | */ | |
1429 | static | |
1430 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1431 | { | |
1432 | /* We can skip if session is not active */ | |
1433 | if (!session->active) | |
1434 | return; | |
1435 | lttng_session_sync_enablers(session); | |
1436 | } | |
1437 | ||
1ec3f75a | 1438 | /* |
d83004aa JD |
1439 | * Serialize at most one packet worth of metadata into a metadata |
1440 | * channel. | |
1ec3f75a MD |
1441 | * We have exclusive access to our metadata buffer (protected by the |
1442 | * sessions_mutex), so we can do racy operations such as looking for | |
1443 | * remaining space left in packet and write, since mutual exclusion | |
1444 | * protects us from concurrent writes. | |
35097f36 JD |
1445 | * Returns the number of bytes written in the channel, 0 if no data |
1446 | * was written and a negative value on error. | |
1ec3f75a | 1447 | */ |
b3b8072b MD |
1448 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1449 | struct channel *chan) | |
d83004aa JD |
1450 | { |
1451 | struct lib_ring_buffer_ctx ctx; | |
1452 | int ret = 0; | |
1453 | size_t len, reserve_len; | |
1454 | ||
f613e3e6 MD |
1455 | /* |
1456 | * Ensure we support mutiple get_next / put sequences followed | |
de23d59d MD |
1457 | * by put_next. The metadata stream lock internally protects |
1458 | * reading the metadata cache. It can indeed be read | |
1459 | * concurrently by "get_next_subbuf" and "flush" operations on | |
1460 | * the buffer invoked by different processes. | |
f613e3e6 | 1461 | */ |
de23d59d | 1462 | mutex_lock(&stream->lock); |
f613e3e6 MD |
1463 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1464 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1465 | goto end; |
f613e3e6 | 1466 | |
d83004aa | 1467 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1468 | stream->metadata_in; |
9de2c215 | 1469 | if (!len) |
de23d59d | 1470 | goto end; |
d83004aa | 1471 | reserve_len = min_t(size_t, |
b3b8072b | 1472 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1473 | len); |
b3b8072b | 1474 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1475 | sizeof(char), -1); |
1476 | /* | |
1477 | * If reservation failed, return an error to the caller. | |
1478 | */ | |
b3b8072b | 1479 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1480 | if (ret != 0) { |
1481 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1482 | goto end; | |
1483 | } | |
b3b8072b | 1484 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1485 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1486 | reserve_len); |
b3b8072b | 1487 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1488 | stream->metadata_in += reserve_len; |
d83004aa JD |
1489 | ret = reserve_len; |
1490 | ||
1491 | end: | |
de23d59d | 1492 | mutex_unlock(&stream->lock); |
d83004aa JD |
1493 | return ret; |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * Write the metadata to the metadata cache. | |
1498 | * Must be called with sessions_mutex held. | |
1499 | */ | |
a90917c3 | 1500 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1501 | const char *fmt, ...) |
1502 | { | |
c099397a | 1503 | char *str; |
d83004aa | 1504 | size_t len; |
c099397a | 1505 | va_list ap; |
d83004aa | 1506 | struct lttng_metadata_stream *stream; |
c099397a MD |
1507 | |
1508 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1509 | ||
1510 | va_start(ap, fmt); | |
1511 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1512 | va_end(ap); | |
1513 | if (!str) | |
1514 | return -ENOMEM; | |
1515 | ||
1ec3f75a | 1516 | len = strlen(str); |
d83004aa JD |
1517 | if (session->metadata_cache->metadata_written + len > |
1518 | session->metadata_cache->cache_alloc) { | |
1519 | char *tmp_cache_realloc; | |
1520 | unsigned int tmp_cache_alloc_size; | |
1521 | ||
1522 | tmp_cache_alloc_size = max_t(unsigned int, | |
1523 | session->metadata_cache->cache_alloc + len, | |
1524 | session->metadata_cache->cache_alloc << 1); | |
1525 | tmp_cache_realloc = krealloc(session->metadata_cache->data, | |
1526 | tmp_cache_alloc_size, GFP_KERNEL); | |
1527 | if (!tmp_cache_realloc) | |
1528 | goto err; | |
1529 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; | |
1530 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1531 | } |
d83004aa JD |
1532 | memcpy(session->metadata_cache->data + |
1533 | session->metadata_cache->metadata_written, | |
1534 | str, len); | |
1535 | session->metadata_cache->metadata_written += len; | |
c099397a | 1536 | kfree(str); |
d83004aa JD |
1537 | |
1538 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1539 | wake_up_interruptible(&stream->read_wait); | |
1540 | ||
1541 | return 0; | |
1542 | ||
1543 | err: | |
1544 | kfree(str); | |
1545 | return -ENOMEM; | |
c099397a MD |
1546 | } |
1547 | ||
d83004aa JD |
1548 | /* |
1549 | * Must be called with sessions_mutex held. | |
1550 | */ | |
c099397a | 1551 | static |
a90917c3 | 1552 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 1553 | const struct lttng_event_field *field) |
c099397a | 1554 | { |
c099397a | 1555 | int ret = 0; |
c099397a | 1556 | |
8070f5c0 MD |
1557 | switch (field->type.atype) { |
1558 | case atype_integer: | |
1559 | ret = lttng_metadata_printf(session, | |
244465ab | 1560 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1561 | field->type.u.basic.integer.size, |
1562 | field->type.u.basic.integer.alignment, | |
1563 | field->type.u.basic.integer.signedness, | |
1564 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1565 | ? "none" | |
1566 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1567 | ? "UTF8" | |
1568 | : "ASCII", | |
1569 | field->type.u.basic.integer.base, | |
c099397a | 1570 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1571 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1572 | #else |
8070f5c0 | 1573 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1574 | #endif |
8070f5c0 MD |
1575 | field->name); |
1576 | break; | |
1577 | case atype_enum: | |
1578 | ret = lttng_metadata_printf(session, | |
244465ab | 1579 | " %s _%s;\n", |
8070f5c0 MD |
1580 | field->type.u.basic.enumeration.name, |
1581 | field->name); | |
1582 | break; | |
1583 | case atype_array: | |
1584 | { | |
1585 | const struct lttng_basic_type *elem_type; | |
1586 | ||
1587 | elem_type = &field->type.u.array.elem_type; | |
1588 | ret = lttng_metadata_printf(session, | |
244465ab | 1589 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1590 | elem_type->u.basic.integer.size, |
1591 | elem_type->u.basic.integer.alignment, | |
1592 | elem_type->u.basic.integer.signedness, | |
1593 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1594 | ? "none" | |
1595 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1596 | ? "UTF8" | |
1597 | : "ASCII", | |
1598 | elem_type->u.basic.integer.base, | |
8fa75f34 | 1599 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1600 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1601 | #else |
8070f5c0 | 1602 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1603 | #endif |
8070f5c0 MD |
1604 | field->name, field->type.u.array.length); |
1605 | break; | |
1606 | } | |
1607 | case atype_sequence: | |
1608 | { | |
1609 | const struct lttng_basic_type *elem_type; | |
1610 | const struct lttng_basic_type *length_type; | |
1611 | ||
1612 | elem_type = &field->type.u.sequence.elem_type; | |
1613 | length_type = &field->type.u.sequence.length_type; | |
1614 | ret = lttng_metadata_printf(session, | |
1615 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1616 | length_type->u.basic.integer.size, |
32257272 | 1617 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1618 | length_type->u.basic.integer.signedness, |
1619 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1620 | ? "none" | |
0635cdd4 | 1621 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1622 | ? "UTF8" |
0635cdd4 | 1623 | : "ASCII"), |
8070f5c0 | 1624 | length_type->u.basic.integer.base, |
e0a7a7c4 | 1625 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1626 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1627 | #else |
0635cdd4 | 1628 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1629 | #endif |
27d2368e MD |
1630 | field->name); |
1631 | if (ret) | |
1632 | return ret; | |
1633 | ||
1634 | ret = lttng_metadata_printf(session, | |
244465ab | 1635 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1636 | elem_type->u.basic.integer.size, |
32257272 | 1637 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1638 | elem_type->u.basic.integer.signedness, |
1639 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1640 | ? "none" | |
0635cdd4 | 1641 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1642 | ? "UTF8" |
0635cdd4 | 1643 | : "ASCII"), |
8070f5c0 | 1644 | elem_type->u.basic.integer.base, |
8fa75f34 | 1645 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1646 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1647 | #else |
8070f5c0 | 1648 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1649 | #endif |
8070f5c0 | 1650 | field->name, |
27d2368e | 1651 | field->name); |
8070f5c0 MD |
1652 | break; |
1653 | } | |
c099397a | 1654 | |
8070f5c0 MD |
1655 | case atype_string: |
1656 | /* Default encoding is UTF8 */ | |
1657 | ret = lttng_metadata_printf(session, | |
244465ab | 1658 | " string%s _%s;\n", |
8070f5c0 MD |
1659 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1660 | " { encoding = ASCII; }" : "", | |
1661 | field->name); | |
1662 | break; | |
1663 | default: | |
1664 | WARN_ON_ONCE(1); | |
1665 | return -EINVAL; | |
1666 | } | |
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | static | |
a90917c3 | 1671 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1672 | struct lttng_ctx *ctx) |
1673 | { | |
1674 | int ret = 0; | |
1675 | int i; | |
1676 | ||
1677 | if (!ctx) | |
1678 | return 0; | |
1679 | for (i = 0; i < ctx->nr_fields; i++) { | |
1680 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1681 | ||
a90917c3 | 1682 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1683 | if (ret) |
1684 | return ret; | |
1685 | } | |
1686 | return ret; | |
1687 | } | |
1688 | ||
1689 | static | |
a90917c3 MD |
1690 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1691 | struct lttng_event *event) | |
8070f5c0 MD |
1692 | { |
1693 | const struct lttng_event_desc *desc = event->desc; | |
1694 | int ret = 0; | |
1695 | int i; | |
1696 | ||
1697 | for (i = 0; i < desc->nr_fields; i++) { | |
1698 | const struct lttng_event_field *field = &desc->fields[i]; | |
1699 | ||
a90917c3 | 1700 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1701 | if (ret) |
1702 | return ret; | |
c099397a MD |
1703 | } |
1704 | return ret; | |
1705 | } | |
1706 | ||
d83004aa JD |
1707 | /* |
1708 | * Must be called with sessions_mutex held. | |
1709 | */ | |
c099397a | 1710 | static |
a90917c3 MD |
1711 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1712 | struct lttng_channel *chan, | |
1713 | struct lttng_event *event) | |
c099397a MD |
1714 | { |
1715 | int ret = 0; | |
1716 | ||
1717 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1718 | return 0; | |
d83004aa | 1719 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1720 | return 0; |
1721 | ||
1722 | ret = lttng_metadata_printf(session, | |
1723 | "event {\n" | |
ae734547 | 1724 | " name = \"%s\";\n" |
c099397a | 1725 | " id = %u;\n" |
b9074a1b | 1726 | " stream_id = %u;\n", |
c099397a MD |
1727 | event->desc->name, |
1728 | event->id, | |
1729 | event->chan->id); | |
1730 | if (ret) | |
1731 | goto end; | |
1732 | ||
b9074a1b MD |
1733 | if (event->ctx) { |
1734 | ret = lttng_metadata_printf(session, | |
1735 | " context := struct {\n"); | |
1736 | if (ret) | |
1737 | goto end; | |
1738 | } | |
a90917c3 | 1739 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1740 | if (ret) |
1741 | goto end; | |
b9074a1b MD |
1742 | if (event->ctx) { |
1743 | ret = lttng_metadata_printf(session, | |
1744 | " };\n"); | |
1745 | if (ret) | |
1746 | goto end; | |
1747 | } | |
8070f5c0 MD |
1748 | |
1749 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1750 | " fields := struct {\n" |
1751 | ); | |
1752 | if (ret) | |
1753 | goto end; | |
1754 | ||
a90917c3 | 1755 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1756 | if (ret) |
1757 | goto end; | |
1758 | ||
1759 | /* | |
1760 | * LTTng space reservation can only reserve multiples of the | |
1761 | * byte size. | |
1762 | */ | |
1763 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1764 | " };\n" |
1765 | "};\n\n"); | |
c099397a MD |
1766 | if (ret) |
1767 | goto end; | |
1768 | ||
c099397a MD |
1769 | event->metadata_dumped = 1; |
1770 | end: | |
1771 | return ret; | |
1772 | ||
1773 | } | |
1774 | ||
d83004aa JD |
1775 | /* |
1776 | * Must be called with sessions_mutex held. | |
1777 | */ | |
c099397a | 1778 | static |
a90917c3 MD |
1779 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1780 | struct lttng_channel *chan) | |
c099397a MD |
1781 | { |
1782 | int ret = 0; | |
1783 | ||
1784 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1785 | return 0; | |
d83004aa JD |
1786 | |
1787 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1788 | return 0; |
1789 | ||
1790 | WARN_ON_ONCE(!chan->header_type); | |
1791 | ret = lttng_metadata_printf(session, | |
1792 | "stream {\n" | |
1793 | " id = %u;\n" | |
9115fbdc | 1794 | " event.header := %s;\n" |
b9074a1b | 1795 | " packet.context := struct packet_context;\n", |
c099397a MD |
1796 | chan->id, |
1797 | chan->header_type == 1 ? "struct event_header_compact" : | |
1798 | "struct event_header_large"); | |
1799 | if (ret) | |
1800 | goto end; | |
1801 | ||
b9074a1b MD |
1802 | if (chan->ctx) { |
1803 | ret = lttng_metadata_printf(session, | |
1804 | " event.context := struct {\n"); | |
1805 | if (ret) | |
1806 | goto end; | |
1807 | } | |
a90917c3 | 1808 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1809 | if (ret) |
1810 | goto end; | |
b9074a1b MD |
1811 | if (chan->ctx) { |
1812 | ret = lttng_metadata_printf(session, | |
1813 | " };\n"); | |
1814 | if (ret) | |
1815 | goto end; | |
1816 | } | |
8070f5c0 MD |
1817 | |
1818 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1819 | "};\n\n"); |
8070f5c0 | 1820 | |
c099397a MD |
1821 | chan->metadata_dumped = 1; |
1822 | end: | |
1823 | return ret; | |
1824 | } | |
1825 | ||
d83004aa JD |
1826 | /* |
1827 | * Must be called with sessions_mutex held. | |
1828 | */ | |
9115fbdc | 1829 | static |
a90917c3 | 1830 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1831 | { |
1832 | return lttng_metadata_printf(session, | |
1833 | "struct packet_context {\n" | |
a3ccff4f MD |
1834 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1835 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1836 | " uint64_t content_size;\n" |
1837 | " uint64_t packet_size;\n" | |
a9afe705 | 1838 | " unsigned long events_discarded;\n" |
9115fbdc | 1839 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1840 | "};\n\n" |
9115fbdc MD |
1841 | ); |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Compact header: | |
1846 | * id: range: 0 - 30. | |
1847 | * id 31 is reserved to indicate an extended header. | |
1848 | * | |
1849 | * Large header: | |
1850 | * id: range: 0 - 65534. | |
1851 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1852 | * |
1853 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1854 | */ |
1855 | static | |
a90917c3 | 1856 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1857 | { |
1858 | return lttng_metadata_printf(session, | |
1859 | "struct event_header_compact {\n" | |
1860 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1861 | " variant <id> {\n" | |
1862 | " struct {\n" | |
a3ccff4f | 1863 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1864 | " } compact;\n" |
1865 | " struct {\n" | |
1866 | " uint32_t id;\n" | |
a3ccff4f | 1867 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1868 | " } extended;\n" |
1869 | " } v;\n" | |
1870 | "} align(%u);\n" | |
1871 | "\n" | |
1872 | "struct event_header_large {\n" | |
1873 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1874 | " variant <id> {\n" | |
1875 | " struct {\n" | |
a3ccff4f | 1876 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1877 | " } compact;\n" |
1878 | " struct {\n" | |
1879 | " uint32_t id;\n" | |
a3ccff4f | 1880 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1881 | " } extended;\n" |
1882 | " } v;\n" | |
1883 | "} align(%u);\n\n", | |
a90917c3 MD |
1884 | lttng_alignof(uint32_t) * CHAR_BIT, |
1885 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1886 | ); |
1887 | } | |
1888 | ||
a3ccff4f MD |
1889 | /* |
1890 | * Approximation of NTP time of day to clock monotonic correlation, | |
1891 | * taken at start of trace. | |
1892 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1893 | * in future versions. | |
1894 | */ | |
1895 | static | |
1896 | uint64_t measure_clock_offset(void) | |
1897 | { | |
1898 | uint64_t offset, monotonic[2], realtime; | |
1899 | struct timespec rts = { 0, 0 }; | |
1900 | unsigned long flags; | |
1901 | ||
1902 | /* Disable interrupts to increase correlation precision. */ | |
1903 | local_irq_save(flags); | |
1904 | monotonic[0] = trace_clock_read64(); | |
1905 | getnstimeofday(&rts); | |
1906 | monotonic[1] = trace_clock_read64(); | |
1907 | local_irq_restore(flags); | |
1908 | ||
1909 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
57be518d | 1910 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f MD |
1911 | realtime += rts.tv_nsec; |
1912 | offset = realtime - offset; | |
1913 | return offset; | |
1914 | } | |
1915 | ||
c099397a MD |
1916 | /* |
1917 | * Output metadata into this session's metadata buffers. | |
d83004aa | 1918 | * Must be called with sessions_mutex held. |
c099397a MD |
1919 | */ |
1920 | static | |
a90917c3 | 1921 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 1922 | { |
30bdb6e4 | 1923 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 1924 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
1925 | struct lttng_channel *chan; |
1926 | struct lttng_event *event; | |
c099397a MD |
1927 | int ret = 0; |
1928 | ||
1929 | if (!ACCESS_ONCE(session->active)) | |
1930 | return 0; | |
1931 | if (session->metadata_dumped) | |
1932 | goto skip_session; | |
c099397a | 1933 | |
d793d5e1 | 1934 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
1935 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
1936 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1937 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1938 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1939 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
1940 | |
1941 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1942 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
1943 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1944 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1945 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 1946 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
1947 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1948 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
1949 | "\n" |
1950 | "trace {\n" | |
1951 | " major = %u;\n" | |
1952 | " minor = %u;\n" | |
30bdb6e4 | 1953 | " uuid = \"%s\";\n" |
d793d5e1 MD |
1954 | " byte_order = %s;\n" |
1955 | " packet.header := struct {\n" | |
1956 | " uint32_t magic;\n" | |
1ec3f75a | 1957 | " uint8_t uuid[16];\n" |
d793d5e1 | 1958 | " uint32_t stream_id;\n" |
0eb25f58 | 1959 | " };\n" |
d793d5e1 | 1960 | "};\n\n", |
a90917c3 MD |
1961 | lttng_alignof(uint8_t) * CHAR_BIT, |
1962 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1963 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1964 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
1965 | sizeof(unsigned long) * CHAR_BIT, |
1966 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
1967 | CTF_SPEC_MAJOR, |
1968 | CTF_SPEC_MINOR, | |
d793d5e1 MD |
1969 | uuid_s, |
1970 | #ifdef __BIG_ENDIAN | |
1971 | "be" | |
1972 | #else | |
1973 | "le" | |
1974 | #endif | |
1975 | ); | |
1976 | if (ret) | |
1977 | goto end; | |
1978 | ||
99dc9597 MD |
1979 | ret = lttng_metadata_printf(session, |
1980 | "env {\n" | |
a6058143 | 1981 | " hostname = \"%s\";\n" |
c6c9e10f | 1982 | " domain = \"kernel\";\n" |
99dc9597 | 1983 | " sysname = \"%s\";\n" |
c6c9e10f MD |
1984 | " kernel_release = \"%s\";\n" |
1985 | " kernel_version = \"%s\";\n" | |
1986 | " tracer_name = \"lttng-modules\";\n" | |
1987 | " tracer_major = %d;\n" | |
1988 | " tracer_minor = %d;\n" | |
1989 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 1990 | "};\n\n", |
3d0d43db | 1991 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
1992 | utsname()->sysname, |
1993 | utsname()->release, | |
c6c9e10f MD |
1994 | utsname()->version, |
1995 | LTTNG_MODULES_MAJOR_VERSION, | |
1996 | LTTNG_MODULES_MINOR_VERSION, | |
1997 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
1998 | ); |
1999 | if (ret) | |
2000 | goto end; | |
2001 | ||
a3ccff4f MD |
2002 | ret = lttng_metadata_printf(session, |
2003 | "clock {\n" | |
a82c63f1 MD |
2004 | " name = %s;\n", |
2005 | "monotonic" | |
2006 | ); | |
2007 | if (ret) | |
2008 | goto end; | |
2009 | ||
2010 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2011 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2012 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2013 | clock_uuid_s |
2014 | ); | |
2015 | if (ret) | |
2016 | goto end; | |
2017 | } | |
2018 | ||
2019 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
2020 | " description = \"Monotonic Clock\";\n" |
2021 | " freq = %llu; /* Frequency, in Hz */\n" | |
2022 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
2023 | " offset = %llu;\n" | |
2024 | "};\n\n", | |
a3ccff4f MD |
2025 | (unsigned long long) trace_clock_freq(), |
2026 | (unsigned long long) measure_clock_offset() | |
2027 | ); | |
2028 | if (ret) | |
2029 | goto end; | |
2030 | ||
2031 | ret = lttng_metadata_printf(session, | |
2032 | "typealias integer {\n" | |
2033 | " size = 27; align = 1; signed = false;\n" | |
2034 | " map = clock.monotonic.value;\n" | |
2035 | "} := uint27_clock_monotonic_t;\n" | |
2036 | "\n" | |
2037 | "typealias integer {\n" | |
2038 | " size = 32; align = %u; signed = false;\n" | |
2039 | " map = clock.monotonic.value;\n" | |
2040 | "} := uint32_clock_monotonic_t;\n" | |
2041 | "\n" | |
2042 | "typealias integer {\n" | |
2043 | " size = 64; align = %u; signed = false;\n" | |
2044 | " map = clock.monotonic.value;\n" | |
2045 | "} := uint64_clock_monotonic_t;\n\n", | |
2046 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2047 | lttng_alignof(uint64_t) * CHAR_BIT | |
2048 | ); | |
2049 | if (ret) | |
2050 | goto end; | |
2051 | ||
a90917c3 | 2052 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2053 | if (ret) |
2054 | goto end; | |
2055 | ||
a90917c3 | 2056 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2057 | if (ret) |
2058 | goto end; | |
2059 | ||
c099397a MD |
2060 | skip_session: |
2061 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2062 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2063 | if (ret) |
2064 | goto end; | |
2065 | } | |
2066 | ||
2067 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2068 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2069 | if (ret) |
2070 | goto end; | |
2071 | } | |
2072 | session->metadata_dumped = 1; | |
2073 | end: | |
2074 | return ret; | |
2075 | } | |
2076 | ||
c0e31d2e | 2077 | /** |
a90917c3 | 2078 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2079 | * @transport: transport structure |
2080 | * | |
2081 | * Registers a transport which can be used as output to extract the data out of | |
2082 | * LTTng. The module calling this registration function must ensure that no | |
2083 | * trap-inducing code will be executed by the transport functions. E.g. | |
2084 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2085 | * is made visible to the transport function. This registration acts as a | |
2086 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2087 | * after its registration must it synchronize the TLBs. | |
2088 | */ | |
a90917c3 | 2089 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2090 | { |
2091 | /* | |
2092 | * Make sure no page fault can be triggered by the module about to be | |
2093 | * registered. We deal with this here so we don't have to call | |
2094 | * vmalloc_sync_all() in each module's init. | |
2095 | */ | |
6d2a620c | 2096 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2097 | |
2098 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2099 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2100 | mutex_unlock(&sessions_mutex); |
2101 | } | |
a90917c3 | 2102 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2103 | |
2104 | /** | |
a90917c3 | 2105 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2106 | * @transport: transport structure |
2107 | */ | |
a90917c3 | 2108 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2109 | { |
2110 | mutex_lock(&sessions_mutex); | |
2111 | list_del(&transport->node); | |
2112 | mutex_unlock(&sessions_mutex); | |
2113 | } | |
a90917c3 | 2114 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2115 | |
a90917c3 | 2116 | static int __init lttng_events_init(void) |
4e3c1b9b | 2117 | { |
1c25284c MD |
2118 | int ret; |
2119 | ||
453b2495 JD |
2120 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2121 | if (ret) | |
2122 | return ret; | |
389d7070 MD |
2123 | ret = wrapper_get_pfnblock_flags_mask_init(); |
2124 | if (ret) | |
2125 | return ret; | |
07dfc1d0 | 2126 | ret = lttng_context_init(); |
20591cf7 MD |
2127 | if (ret) |
2128 | return ret; | |
07dfc1d0 MD |
2129 | ret = lttng_tracepoint_init(); |
2130 | if (ret) | |
2131 | goto error_tp; | |
a90917c3 | 2132 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2133 | if (!event_cache) { |
2134 | ret = -ENOMEM; | |
2135 | goto error_kmem; | |
2136 | } | |
80996790 | 2137 | ret = lttng_abi_init(); |
02119ee5 MD |
2138 | if (ret) |
2139 | goto error_abi; | |
0c956676 MD |
2140 | ret = lttng_logger_init(); |
2141 | if (ret) | |
2142 | goto error_logger; | |
4e3c1b9b | 2143 | return 0; |
0c956676 MD |
2144 | |
2145 | error_logger: | |
2146 | lttng_abi_exit(); | |
02119ee5 | 2147 | error_abi: |
1c25284c | 2148 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2149 | error_kmem: |
2150 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2151 | error_tp: |
2152 | lttng_context_exit(); | |
1c25284c | 2153 | return ret; |
4e3c1b9b MD |
2154 | } |
2155 | ||
a90917c3 | 2156 | module_init(lttng_events_init); |
11b5a3c2 | 2157 | |
a90917c3 | 2158 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2159 | { |
a90917c3 | 2160 | struct lttng_session *session, *tmpsession; |
92e94819 | 2161 | |
0c956676 | 2162 | lttng_logger_exit(); |
80996790 | 2163 | lttng_abi_exit(); |
92e94819 | 2164 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2165 | lttng_session_destroy(session); |
11b5a3c2 | 2166 | kmem_cache_destroy(event_cache); |
20591cf7 | 2167 | lttng_tracepoint_exit(); |
07dfc1d0 | 2168 | lttng_context_exit(); |
4e3c1b9b | 2169 | } |
92e94819 | 2170 | |
a90917c3 | 2171 | module_exit(lttng_events_exit); |
11b5a3c2 | 2172 | |
92e94819 MD |
2173 | MODULE_LICENSE("GPL and additional rights"); |
2174 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2175 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2176 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2177 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2178 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2179 | LTTNG_MODULES_EXTRAVERSION); |