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> | |
241ae9a8 | 39 | #include <wrapper/file.h> |
3c997079 | 40 | #include <linux/jhash.h> |
8c6e7f13 | 41 | #include <linux/uaccess.h> |
a606b6e8 | 42 | #include <linux/vmalloc.h> |
3c997079 | 43 | |
241ae9a8 MD |
44 | #include <wrapper/uuid.h> |
45 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ | |
46 | #include <wrapper/random.h> | |
47 | #include <wrapper/tracepoint.h> | |
48 | #include <wrapper/list.h> | |
49 | #include <lttng-kernel-version.h> | |
50 | #include <lttng-events.h> | |
51 | #include <lttng-tracer.h> | |
52 | #include <lttng-abi-old.h> | |
5214fa50 | 53 | #include <lttng-endian.h> |
241ae9a8 | 54 | #include <wrapper/vzalloc.h> |
64af2437 MD |
55 | #include <wrapper/ringbuffer/backend.h> |
56 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 57 | |
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
62 | /* |
63 | * Protect the sessions and metadata caches. | |
64 | */ | |
4e3c1b9b MD |
65 | static DEFINE_MUTEX(sessions_mutex); |
66 | static struct kmem_cache *event_cache; | |
67 | ||
3c997079 MD |
68 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
69 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
70 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
71 | ||
a90917c3 MD |
72 | static void _lttng_event_destroy(struct lttng_event *event); |
73 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
74 | static int _lttng_event_unregister(struct lttng_event *event); | |
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 MD |
83 | static |
84 | int _lttng_field_statedump(struct lttng_session *session, | |
85 | const struct lttng_event_field *field, | |
86 | size_t nesting); | |
c099397a | 87 | |
c099397a | 88 | void synchronize_trace(void) |
abcca994 MD |
89 | { |
90 | synchronize_sched(); | |
b8590f40 MD |
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
92 | #ifdef CONFIG_PREEMPT_RT_FULL | |
93 | synchronize_rcu(); | |
94 | #endif | |
95 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
96 | #ifdef CONFIG_PREEMPT_RT |
97 | synchronize_rcu(); | |
98 | #endif | |
b8590f40 | 99 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
100 | } |
101 | ||
3c997079 MD |
102 | void lttng_lock_sessions(void) |
103 | { | |
104 | mutex_lock(&sessions_mutex); | |
105 | } | |
106 | ||
107 | void lttng_unlock_sessions(void) | |
108 | { | |
109 | mutex_unlock(&sessions_mutex); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Called with sessions lock held. | |
114 | */ | |
115 | int lttng_session_active(void) | |
116 | { | |
117 | struct lttng_session *iter; | |
118 | ||
119 | list_for_each_entry(iter, &sessions, list) { | |
120 | if (iter->active) | |
121 | return 1; | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
a90917c3 | 126 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 127 | { |
a90917c3 | 128 | struct lttng_session *session; |
d83004aa | 129 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 130 | int i; |
4e3c1b9b MD |
131 | |
132 | mutex_lock(&sessions_mutex); | |
a90917c3 | 133 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 134 | if (!session) |
d83004aa | 135 | goto err; |
4e3c1b9b | 136 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 137 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 138 | uuid_le_gen(&session->uuid); |
d83004aa JD |
139 | |
140 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
141 | GFP_KERNEL); | |
142 | if (!metadata_cache) | |
143 | goto err_free_session; | |
f6da044f | 144 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
145 | if (!metadata_cache->data) |
146 | goto err_free_cache; | |
147 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
148 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 149 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
150 | session->metadata_cache = metadata_cache; |
151 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
152 | memcpy(&metadata_cache->uuid, &session->uuid, |
153 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
154 | INIT_LIST_HEAD(&session->enablers_head); |
155 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
156 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
157 | list_add(&session->list, &sessions); |
158 | mutex_unlock(&sessions_mutex); | |
159 | return session; | |
d83004aa JD |
160 | |
161 | err_free_cache: | |
162 | kfree(metadata_cache); | |
163 | err_free_session: | |
164 | kfree(session); | |
165 | err: | |
166 | mutex_unlock(&sessions_mutex); | |
167 | return NULL; | |
168 | } | |
169 | ||
170 | void metadata_cache_destroy(struct kref *kref) | |
171 | { | |
172 | struct lttng_metadata_cache *cache = | |
173 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 174 | vfree(cache->data); |
d83004aa | 175 | kfree(cache); |
4e3c1b9b MD |
176 | } |
177 | ||
a90917c3 | 178 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 179 | { |
a90917c3 MD |
180 | struct lttng_channel *chan, *tmpchan; |
181 | struct lttng_event *event, *tmpevent; | |
d83004aa | 182 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 183 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 184 | int ret; |
4e3c1b9b MD |
185 | |
186 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 187 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
188 | list_for_each_entry(chan, &session->chan, list) { |
189 | ret = lttng_syscalls_unregister(chan); | |
190 | WARN_ON(ret); | |
191 | } | |
dda6a249 | 192 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 193 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
194 | WARN_ON(ret); |
195 | } | |
abcca994 | 196 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
197 | list_for_each_entry_safe(enabler, tmpenabler, |
198 | &session->enablers_head, node) | |
199 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 200 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 201 | _lttng_event_destroy(event); |
d83004aa JD |
202 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
203 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 204 | _lttng_channel_destroy(chan); |
d83004aa JD |
205 | } |
206 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
207 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
208 | if (session->pid_tracker) |
209 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 210 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
211 | list_del(&session->list); |
212 | mutex_unlock(&sessions_mutex); | |
213 | kfree(session); | |
214 | } | |
215 | ||
a90917c3 | 216 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
217 | { |
218 | int ret = 0; | |
a90917c3 | 219 | struct lttng_channel *chan; |
c0e31d2e MD |
220 | |
221 | mutex_lock(&sessions_mutex); | |
222 | if (session->active) { | |
223 | ret = -EBUSY; | |
224 | goto end; | |
225 | } | |
c099397a | 226 | |
3c997079 MD |
227 | /* Set transient enabler state to "enabled" */ |
228 | session->tstate = 1; | |
229 | ||
c099397a MD |
230 | /* |
231 | * Snapshot the number of events per channel to know the type of header | |
232 | * we need to use. | |
233 | */ | |
234 | list_for_each_entry(chan, &session->chan, list) { | |
235 | if (chan->header_type) | |
236 | continue; /* don't change it if session stop/restart */ | |
237 | if (chan->free_event_id < 31) | |
238 | chan->header_type = 1; /* compact */ | |
239 | else | |
240 | chan->header_type = 2; /* large */ | |
241 | } | |
242 | ||
3c997079 MD |
243 | /* We need to sync enablers with session before activation. */ |
244 | lttng_session_sync_enablers(session); | |
245 | ||
64af2437 | 246 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
247 | list_for_each_entry(chan, &session->chan, list) { |
248 | if (chan->channel_type != METADATA_CHANNEL) | |
249 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
250 | } | |
64af2437 | 251 | |
52fc2e1f | 252 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 253 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 254 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
255 | if (ret) { |
256 | ACCESS_ONCE(session->active) = 0; | |
257 | goto end; | |
258 | } | |
259 | ret = lttng_statedump_start(session); | |
360f38ea | 260 | if (ret) |
c099397a | 261 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
262 | end: |
263 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 264 | return ret; |
c0e31d2e MD |
265 | } |
266 | ||
a90917c3 | 267 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
268 | { |
269 | int ret = 0; | |
64af2437 | 270 | struct lttng_channel *chan; |
c0e31d2e MD |
271 | |
272 | mutex_lock(&sessions_mutex); | |
273 | if (!session->active) { | |
274 | ret = -EBUSY; | |
275 | goto end; | |
276 | } | |
52fc2e1f | 277 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
278 | |
279 | /* Set transient enabler state to "disabled" */ | |
280 | session->tstate = 0; | |
281 | lttng_session_sync_enablers(session); | |
64af2437 MD |
282 | |
283 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
284 | list_for_each_entry(chan, &session->chan, list) { |
285 | if (chan->channel_type != METADATA_CHANNEL) | |
286 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
287 | } | |
c0e31d2e MD |
288 | end: |
289 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 290 | return ret; |
c0e31d2e MD |
291 | } |
292 | ||
9616f0bf JD |
293 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
294 | { | |
295 | int ret = 0; | |
296 | struct lttng_channel *chan; | |
297 | struct lttng_event *event; | |
298 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
299 | struct lttng_metadata_stream *stream; | |
300 | ||
301 | mutex_lock(&sessions_mutex); | |
302 | if (!session->active) { | |
303 | ret = -EBUSY; | |
304 | goto end; | |
305 | } | |
306 | ||
307 | mutex_lock(&cache->lock); | |
308 | memset(cache->data, 0, cache->cache_alloc); | |
309 | cache->metadata_written = 0; | |
310 | cache->version++; | |
311 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
312 | stream->metadata_out = 0; | |
313 | stream->metadata_in = 0; | |
314 | } | |
315 | mutex_unlock(&cache->lock); | |
316 | ||
317 | session->metadata_dumped = 0; | |
318 | list_for_each_entry(chan, &session->chan, list) { | |
319 | chan->metadata_dumped = 0; | |
320 | } | |
321 | ||
322 | list_for_each_entry(event, &session->events, list) { | |
323 | event->metadata_dumped = 0; | |
324 | } | |
325 | ||
326 | ret = _lttng_session_metadata_statedump(session); | |
327 | ||
328 | end: | |
329 | mutex_unlock(&sessions_mutex); | |
330 | return ret; | |
331 | } | |
332 | ||
333 | ||
334 | ||
a90917c3 | 335 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 336 | { |
3c997079 | 337 | int ret = 0; |
e64957da | 338 | |
3c997079 MD |
339 | mutex_lock(&sessions_mutex); |
340 | if (channel->channel_type == METADATA_CHANNEL) { | |
341 | ret = -EPERM; | |
342 | goto end; | |
343 | } | |
344 | if (channel->enabled) { | |
345 | ret = -EEXIST; | |
346 | goto end; | |
347 | } | |
348 | /* Set transient enabler state to "enabled" */ | |
349 | channel->tstate = 1; | |
350 | lttng_session_sync_enablers(channel->session); | |
351 | /* Set atomically the state to "enabled" */ | |
352 | ACCESS_ONCE(channel->enabled) = 1; | |
353 | end: | |
354 | mutex_unlock(&sessions_mutex); | |
355 | return ret; | |
e64957da MD |
356 | } |
357 | ||
a90917c3 | 358 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 359 | { |
3c997079 | 360 | int ret = 0; |
e64957da | 361 | |
3c997079 MD |
362 | mutex_lock(&sessions_mutex); |
363 | if (channel->channel_type == METADATA_CHANNEL) { | |
364 | ret = -EPERM; | |
365 | goto end; | |
366 | } | |
367 | if (!channel->enabled) { | |
368 | ret = -EEXIST; | |
369 | goto end; | |
370 | } | |
371 | /* Set atomically the state to "disabled" */ | |
372 | ACCESS_ONCE(channel->enabled) = 0; | |
373 | /* Set transient enabler state to "enabled" */ | |
374 | channel->tstate = 0; | |
375 | lttng_session_sync_enablers(channel->session); | |
376 | end: | |
377 | mutex_unlock(&sessions_mutex); | |
378 | return ret; | |
e64957da MD |
379 | } |
380 | ||
a90917c3 | 381 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 382 | { |
3c997079 | 383 | int ret = 0; |
e64957da | 384 | |
3c997079 MD |
385 | mutex_lock(&sessions_mutex); |
386 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
387 | ret = -EPERM; | |
388 | goto end; | |
389 | } | |
390 | if (event->enabled) { | |
391 | ret = -EEXIST; | |
392 | goto end; | |
393 | } | |
a0493bef MD |
394 | switch (event->instrumentation) { |
395 | case LTTNG_KERNEL_TRACEPOINT: | |
396 | case LTTNG_KERNEL_SYSCALL: | |
397 | ret = -EINVAL; | |
398 | break; | |
399 | case LTTNG_KERNEL_KPROBE: | |
400 | case LTTNG_KERNEL_FUNCTION: | |
401 | case LTTNG_KERNEL_NOOP: | |
402 | ACCESS_ONCE(event->enabled) = 1; | |
403 | break; | |
404 | case LTTNG_KERNEL_KRETPROBE: | |
405 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
406 | break; | |
407 | default: | |
408 | WARN_ON_ONCE(1); | |
409 | ret = -EINVAL; | |
410 | } | |
3c997079 MD |
411 | end: |
412 | mutex_unlock(&sessions_mutex); | |
413 | return ret; | |
e64957da MD |
414 | } |
415 | ||
a90917c3 | 416 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 417 | { |
3c997079 | 418 | int ret = 0; |
e64957da | 419 | |
3c997079 MD |
420 | mutex_lock(&sessions_mutex); |
421 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
422 | ret = -EPERM; | |
423 | goto end; | |
424 | } | |
425 | if (!event->enabled) { | |
426 | ret = -EEXIST; | |
427 | goto end; | |
428 | } | |
a0493bef MD |
429 | switch (event->instrumentation) { |
430 | case LTTNG_KERNEL_TRACEPOINT: | |
431 | case LTTNG_KERNEL_SYSCALL: | |
432 | ret = -EINVAL; | |
433 | break; | |
434 | case LTTNG_KERNEL_KPROBE: | |
435 | case LTTNG_KERNEL_FUNCTION: | |
436 | case LTTNG_KERNEL_NOOP: | |
437 | ACCESS_ONCE(event->enabled) = 0; | |
438 | break; | |
439 | case LTTNG_KERNEL_KRETPROBE: | |
440 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
441 | break; | |
442 | default: | |
443 | WARN_ON_ONCE(1); | |
444 | ret = -EINVAL; | |
445 | } | |
3c997079 MD |
446 | end: |
447 | mutex_unlock(&sessions_mutex); | |
448 | return ret; | |
e64957da MD |
449 | } |
450 | ||
a90917c3 | 451 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 452 | { |
a90917c3 | 453 | struct lttng_transport *transport; |
f3d01b96 | 454 | |
a90917c3 | 455 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
456 | if (!strcmp(transport->name, name)) |
457 | return transport; | |
458 | } | |
459 | return NULL; | |
460 | } | |
461 | ||
a90917c3 | 462 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
463 | const char *transport_name, |
464 | void *buf_addr, | |
4e3c1b9b MD |
465 | size_t subbuf_size, size_t num_subbuf, |
466 | unsigned int switch_timer_interval, | |
d83004aa JD |
467 | unsigned int read_timer_interval, |
468 | enum channel_type channel_type) | |
4e3c1b9b | 469 | { |
a90917c3 MD |
470 | struct lttng_channel *chan; |
471 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
472 | |
473 | mutex_lock(&sessions_mutex); | |
d83004aa | 474 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 475 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 476 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
477 | if (!transport) { |
478 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
479 | transport_name); | |
c0e31d2e | 480 | goto notransport; |
f3d01b96 | 481 | } |
a33c9927 MD |
482 | if (!try_module_get(transport->owner)) { |
483 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
484 | goto notransport; | |
485 | } | |
a90917c3 | 486 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 487 | if (!chan) |
c0e31d2e | 488 | goto nomem; |
4e3c1b9b | 489 | chan->session = session; |
05d32c64 | 490 | chan->id = session->free_chan_id++; |
3b731ab1 | 491 | chan->ops = &transport->ops; |
125b4df4 MD |
492 | /* |
493 | * Note: the channel creation op already writes into the packet | |
494 | * headers. Therefore the "chan" information used as input | |
495 | * should be already accessible. | |
496 | */ | |
5f5ddf01 MD |
497 | chan->chan = transport->ops.channel_create(transport_name, |
498 | chan, buf_addr, subbuf_size, num_subbuf, | |
499 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
500 | if (!chan->chan) |
501 | goto create_error; | |
3c997079 | 502 | chan->tstate = 1; |
e64957da | 503 | chan->enabled = 1; |
a33c9927 | 504 | chan->transport = transport; |
d83004aa | 505 | chan->channel_type = channel_type; |
4e3c1b9b MD |
506 | list_add(&chan->list, &session->chan); |
507 | mutex_unlock(&sessions_mutex); | |
508 | return chan; | |
509 | ||
f3d01b96 MD |
510 | create_error: |
511 | kfree(chan); | |
c0e31d2e | 512 | nomem: |
a33c9927 MD |
513 | if (transport) |
514 | module_put(transport->owner); | |
c0e31d2e | 515 | notransport: |
e5382b6d | 516 | active: |
4e3c1b9b MD |
517 | mutex_unlock(&sessions_mutex); |
518 | return NULL; | |
519 | } | |
520 | ||
521 | /* | |
d83004aa JD |
522 | * Only used internally at session destruction for per-cpu channels, and |
523 | * when metadata channel is released. | |
524 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 525 | */ |
aa7c23a9 | 526 | static |
a90917c3 | 527 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 528 | { |
11b5a3c2 | 529 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 530 | module_put(chan->transport->owner); |
4e3c1b9b | 531 | list_del(&chan->list); |
8070f5c0 | 532 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
533 | kfree(chan); |
534 | } | |
535 | ||
d83004aa JD |
536 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
537 | { | |
538 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
539 | ||
540 | /* Protect the metadata cache with the sessions_mutex. */ | |
541 | mutex_lock(&sessions_mutex); | |
542 | _lttng_channel_destroy(chan); | |
543 | mutex_unlock(&sessions_mutex); | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
546 | ||
547 | static | |
548 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
549 | { | |
550 | stream->finalized = 1; | |
551 | wake_up_interruptible(&stream->read_wait); | |
552 | } | |
553 | ||
e5382b6d MD |
554 | /* |
555 | * Supports event creation while tracing session is active. | |
3c997079 | 556 | * Needs to be called with sessions mutex held. |
e5382b6d | 557 | */ |
3c997079 MD |
558 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
559 | struct lttng_kernel_event *event_param, | |
560 | void *filter, | |
561 | const struct lttng_event_desc *event_desc, | |
562 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 563 | { |
3c997079 | 564 | struct lttng_session *session = chan->session; |
a90917c3 | 565 | struct lttng_event *event; |
3c997079 MD |
566 | const char *event_name; |
567 | struct hlist_head *head; | |
568 | size_t name_len; | |
569 | uint32_t hash; | |
3d084699 | 570 | int ret; |
4e3c1b9b | 571 | |
abc0446a | 572 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 573 | ret = -EMFILE; |
e5382b6d | 574 | goto full; |
abc0446a | 575 | } |
3c997079 MD |
576 | |
577 | switch (itype) { | |
578 | case LTTNG_KERNEL_TRACEPOINT: | |
579 | event_name = event_desc->name; | |
580 | break; | |
581 | case LTTNG_KERNEL_KPROBE: | |
582 | case LTTNG_KERNEL_KRETPROBE: | |
583 | case LTTNG_KERNEL_FUNCTION: | |
584 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 585 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
586 | event_name = event_param->name; |
587 | break; | |
588 | default: | |
589 | WARN_ON_ONCE(1); | |
590 | ret = -EINVAL; | |
591 | goto type_error; | |
592 | } | |
593 | name_len = strlen(event_name); | |
594 | hash = jhash(event_name, name_len, 0); | |
595 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 596 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
597 | WARN_ON_ONCE(!event->desc); |
598 | if (!strncmp(event->desc->name, event_name, | |
599 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
600 | && chan == event->chan) { | |
601 | ret = -EEXIST; | |
602 | goto exist; | |
abc0446a MD |
603 | } |
604 | } | |
3c997079 | 605 | |
11b5a3c2 | 606 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 607 | if (!event) { |
4cf0bf51 | 608 | ret = -ENOMEM; |
4e3c1b9b | 609 | goto cache_error; |
abc0446a | 610 | } |
4e3c1b9b MD |
611 | event->chan = chan; |
612 | event->filter = filter; | |
e5382b6d | 613 | event->id = chan->free_event_id++; |
3c997079 MD |
614 | event->instrumentation = itype; |
615 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 616 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
617 | INIT_LIST_HEAD(&event->enablers_ref_head); |
618 | ||
619 | switch (itype) { | |
ab2277d6 | 620 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
621 | /* Event will be enabled by enabler sync. */ |
622 | event->enabled = 0; | |
623 | event->registered = 0; | |
624 | event->desc = lttng_event_get(event_name); | |
abc0446a | 625 | if (!event->desc) { |
4cf0bf51 | 626 | ret = -ENOENT; |
d3dbe23c | 627 | goto register_error; |
abc0446a | 628 | } |
3c997079 MD |
629 | /* Populate lttng_event structure before event registration. */ |
630 | smp_wmb(); | |
baf20995 | 631 | break; |
ab2277d6 | 632 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
633 | /* |
634 | * Needs to be explicitly enabled after creation, since | |
635 | * we may want to apply filters. | |
636 | */ | |
637 | event->enabled = 0; | |
3c997079 MD |
638 | event->registered = 1; |
639 | /* | |
640 | * Populate lttng_event structure before event | |
641 | * registration. | |
642 | */ | |
643 | smp_wmb(); | |
644 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
645 | event_param->u.kprobe.symbol_name, |
646 | event_param->u.kprobe.offset, | |
647 | event_param->u.kprobe.addr, | |
648 | event); | |
abc0446a | 649 | if (ret) { |
4cf0bf51 | 650 | ret = -EINVAL; |
d6d808f3 | 651 | goto register_error; |
abc0446a | 652 | } |
edeb3137 MD |
653 | ret = try_module_get(event->desc->owner); |
654 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 655 | break; |
7371f44c MD |
656 | case LTTNG_KERNEL_KRETPROBE: |
657 | { | |
a90917c3 | 658 | struct lttng_event *event_return; |
7371f44c MD |
659 | |
660 | /* kretprobe defines 2 events */ | |
a0493bef MD |
661 | /* |
662 | * Needs to be explicitly enabled after creation, since | |
663 | * we may want to apply filters. | |
664 | */ | |
665 | event->enabled = 0; | |
3c997079 | 666 | event->registered = 1; |
7371f44c MD |
667 | event_return = |
668 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 669 | if (!event_return) { |
4cf0bf51 | 670 | ret = -ENOMEM; |
7371f44c | 671 | goto register_error; |
abc0446a | 672 | } |
7371f44c MD |
673 | event_return->chan = chan; |
674 | event_return->filter = filter; | |
675 | event_return->id = chan->free_event_id++; | |
a0493bef | 676 | event_return->enabled = 0; |
3c997079 MD |
677 | event_return->registered = 1; |
678 | event_return->instrumentation = itype; | |
7371f44c | 679 | /* |
a90917c3 | 680 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
681 | */ |
682 | smp_wmb(); | |
3c997079 | 683 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
684 | event_param->u.kretprobe.symbol_name, |
685 | event_param->u.kretprobe.offset, | |
686 | event_param->u.kretprobe.addr, | |
687 | event, event_return); | |
688 | if (ret) { | |
689 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 690 | ret = -EINVAL; |
7371f44c MD |
691 | goto register_error; |
692 | } | |
693 | /* Take 2 refs on the module: one per event. */ | |
694 | ret = try_module_get(event->desc->owner); | |
695 | WARN_ON_ONCE(!ret); | |
696 | ret = try_module_get(event->desc->owner); | |
697 | WARN_ON_ONCE(!ret); | |
a90917c3 | 698 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 699 | event_return); |
abc0446a | 700 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
701 | if (ret) { |
702 | kmem_cache_free(event_cache, event_return); | |
703 | module_put(event->desc->owner); | |
704 | module_put(event->desc->owner); | |
705 | goto statedump_error; | |
706 | } | |
707 | list_add(&event_return->list, &chan->session->events); | |
708 | break; | |
709 | } | |
ab2277d6 | 710 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
711 | /* |
712 | * Needs to be explicitly enabled after creation, since | |
713 | * we may want to apply filters. | |
714 | */ | |
715 | event->enabled = 0; | |
3c997079 MD |
716 | event->registered = 1; |
717 | /* | |
718 | * Populate lttng_event structure before event | |
719 | * registration. | |
720 | */ | |
721 | smp_wmb(); | |
722 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
723 | event_param->u.ftrace.symbol_name, |
724 | event); | |
abc0446a | 725 | if (ret) { |
e0a7a7c4 | 726 | goto register_error; |
abc0446a | 727 | } |
edeb3137 MD |
728 | ret = try_module_get(event->desc->owner); |
729 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 730 | break; |
1ec65de1 | 731 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 732 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
733 | /* |
734 | * Needs to be explicitly enabled after creation, since | |
735 | * we may want to apply filters. | |
736 | */ | |
737 | event->enabled = 0; | |
3c997079 MD |
738 | event->registered = 0; |
739 | event->desc = event_desc; | |
abc0446a | 740 | if (!event->desc) { |
4cf0bf51 | 741 | ret = -EINVAL; |
259b6cb3 | 742 | goto register_error; |
abc0446a | 743 | } |
1ec65de1 | 744 | break; |
baf20995 MD |
745 | default: |
746 | WARN_ON_ONCE(1); | |
4cf0bf51 | 747 | ret = -EINVAL; |
df07930b | 748 | goto register_error; |
baf20995 | 749 | } |
a90917c3 | 750 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
751 | WARN_ON_ONCE(ret > 0); |
752 | if (ret) { | |
c099397a | 753 | goto statedump_error; |
abc0446a | 754 | } |
3c997079 | 755 | hlist_add_head(&event->hlist, head); |
dda6a249 | 756 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
757 | return event; |
758 | ||
c099397a | 759 | statedump_error: |
259b6cb3 | 760 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 761 | register_error: |
11b5a3c2 | 762 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
763 | cache_error: |
764 | exist: | |
3c997079 | 765 | type_error: |
e5382b6d | 766 | full: |
4cf0bf51 | 767 | return ERR_PTR(ret); |
4e3c1b9b MD |
768 | } |
769 | ||
3c997079 MD |
770 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
771 | struct lttng_kernel_event *event_param, | |
772 | void *filter, | |
773 | const struct lttng_event_desc *event_desc, | |
774 | enum lttng_kernel_instrumentation itype) | |
775 | { | |
776 | struct lttng_event *event; | |
777 | ||
778 | mutex_lock(&sessions_mutex); | |
779 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
780 | itype); | |
781 | mutex_unlock(&sessions_mutex); | |
782 | return event; | |
783 | } | |
784 | ||
785 | /* Only used for tracepoints for now. */ | |
786 | static | |
787 | void register_event(struct lttng_event *event) | |
788 | { | |
789 | const struct lttng_event_desc *desc; | |
f127e61e | 790 | int ret = -EINVAL; |
3c997079 | 791 | |
3c997079 MD |
792 | if (event->registered) |
793 | return; | |
4ecb5ad5 | 794 | |
3c997079 | 795 | desc = event->desc; |
4ecb5ad5 MD |
796 | switch (event->instrumentation) { |
797 | case LTTNG_KERNEL_TRACEPOINT: | |
798 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
799 | desc->probe_callback, | |
800 | event); | |
801 | break; | |
802 | case LTTNG_KERNEL_SYSCALL: | |
803 | ret = lttng_syscall_filter_enable(event->chan, | |
804 | desc->name); | |
805 | break; | |
806 | case LTTNG_KERNEL_KPROBE: | |
807 | case LTTNG_KERNEL_KRETPROBE: | |
808 | case LTTNG_KERNEL_FUNCTION: | |
809 | case LTTNG_KERNEL_NOOP: | |
810 | ret = 0; | |
811 | break; | |
812 | default: | |
813 | WARN_ON_ONCE(1); | |
814 | } | |
3c997079 MD |
815 | if (!ret) |
816 | event->registered = 1; | |
817 | } | |
818 | ||
4e3c1b9b MD |
819 | /* |
820 | * Only used internally at session destruction. | |
821 | */ | |
a90917c3 | 822 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 823 | { |
4ecb5ad5 | 824 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
825 | int ret = -EINVAL; |
826 | ||
3c997079 MD |
827 | if (!event->registered) |
828 | return 0; | |
829 | ||
4ecb5ad5 | 830 | desc = event->desc; |
38d024ae | 831 | switch (event->instrumentation) { |
ab2277d6 | 832 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 833 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 834 | event->desc->probe_callback, |
11b5a3c2 | 835 | event); |
baf20995 | 836 | break; |
ab2277d6 | 837 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 838 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
839 | ret = 0; |
840 | break; | |
7371f44c MD |
841 | case LTTNG_KERNEL_KRETPROBE: |
842 | lttng_kretprobes_unregister(event); | |
843 | ret = 0; | |
844 | break; | |
ab2277d6 | 845 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
846 | lttng_ftrace_unregister(event); |
847 | ret = 0; | |
848 | break; | |
33a39a3c | 849 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
850 | ret = lttng_syscall_filter_disable(event->chan, |
851 | desc->name); | |
852 | break; | |
853 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
854 | ret = 0; |
855 | break; | |
baf20995 MD |
856 | default: |
857 | WARN_ON_ONCE(1); | |
858 | } | |
3c997079 MD |
859 | if (!ret) |
860 | event->registered = 0; | |
dda6a249 MD |
861 | return ret; |
862 | } | |
863 | ||
864 | /* | |
865 | * Only used internally at session destruction. | |
866 | */ | |
be066e6c | 867 | static |
a90917c3 | 868 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 869 | { |
edeb3137 MD |
870 | switch (event->instrumentation) { |
871 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 872 | lttng_event_put(event->desc); |
edeb3137 MD |
873 | break; |
874 | case LTTNG_KERNEL_KPROBE: | |
875 | module_put(event->desc->owner); | |
876 | lttng_kprobes_destroy_private(event); | |
877 | break; | |
7371f44c MD |
878 | case LTTNG_KERNEL_KRETPROBE: |
879 | module_put(event->desc->owner); | |
880 | lttng_kretprobes_destroy_private(event); | |
881 | break; | |
edeb3137 MD |
882 | case LTTNG_KERNEL_FUNCTION: |
883 | module_put(event->desc->owner); | |
884 | lttng_ftrace_destroy_private(event); | |
885 | break; | |
259b6cb3 | 886 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 887 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 888 | break; |
edeb3137 MD |
889 | default: |
890 | WARN_ON_ONCE(1); | |
891 | } | |
dda6a249 | 892 | list_del(&event->list); |
8070f5c0 | 893 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 894 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
895 | } |
896 | ||
e0130fab MD |
897 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
898 | { | |
899 | int ret; | |
900 | ||
901 | if (pid < -1) | |
902 | return -EINVAL; | |
903 | mutex_lock(&sessions_mutex); | |
904 | if (pid == -1) { | |
905 | /* track all pids: destroy tracker. */ | |
906 | if (session->pid_tracker) { | |
907 | struct lttng_pid_tracker *lpf; | |
908 | ||
909 | lpf = session->pid_tracker; | |
910 | rcu_assign_pointer(session->pid_tracker, NULL); | |
911 | synchronize_trace(); | |
912 | lttng_pid_tracker_destroy(lpf); | |
913 | } | |
914 | ret = 0; | |
915 | } else { | |
916 | if (!session->pid_tracker) { | |
917 | struct lttng_pid_tracker *lpf; | |
918 | ||
919 | lpf = lttng_pid_tracker_create(); | |
920 | if (!lpf) { | |
921 | ret = -ENOMEM; | |
922 | goto unlock; | |
923 | } | |
924 | ret = lttng_pid_tracker_add(lpf, pid); | |
925 | rcu_assign_pointer(session->pid_tracker, lpf); | |
926 | } else { | |
927 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
928 | } | |
929 | } | |
930 | unlock: | |
931 | mutex_unlock(&sessions_mutex); | |
932 | return ret; | |
933 | } | |
934 | ||
935 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
936 | { | |
937 | int ret; | |
938 | ||
939 | if (pid < -1) | |
940 | return -EINVAL; | |
941 | mutex_lock(&sessions_mutex); | |
942 | if (pid == -1) { | |
943 | /* untrack all pids: replace by empty tracker. */ | |
944 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
945 | struct lttng_pid_tracker *lpf; | |
946 | ||
947 | lpf = lttng_pid_tracker_create(); | |
948 | if (!lpf) { | |
949 | ret = -ENOMEM; | |
950 | goto unlock; | |
951 | } | |
952 | rcu_assign_pointer(session->pid_tracker, lpf); | |
953 | synchronize_trace(); | |
954 | if (old_lpf) | |
955 | lttng_pid_tracker_destroy(old_lpf); | |
956 | ret = 0; | |
957 | } else { | |
958 | if (!session->pid_tracker) { | |
959 | ret = -ENOENT; | |
960 | goto unlock; | |
961 | } | |
962 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
963 | } | |
964 | unlock: | |
965 | mutex_unlock(&sessions_mutex); | |
966 | return ret; | |
967 | } | |
968 | ||
7e6f9ef6 MD |
969 | static |
970 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
971 | { | |
972 | struct lttng_session *session = m->private; | |
973 | struct lttng_pid_tracker *lpf; | |
974 | struct lttng_pid_hash_node *e; | |
975 | int iter = 0, i; | |
976 | ||
977 | mutex_lock(&sessions_mutex); | |
978 | lpf = session->pid_tracker; | |
979 | if (lpf) { | |
980 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
981 | struct hlist_head *head = &lpf->pid_hash[i]; | |
982 | ||
f934e302 | 983 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
984 | if (iter++ >= *pos) |
985 | return e; | |
986 | } | |
987 | } | |
988 | } else { | |
989 | /* PID tracker disabled. */ | |
990 | if (iter >= *pos && iter == 0) { | |
991 | return session; /* empty tracker */ | |
992 | } | |
993 | iter++; | |
994 | } | |
995 | /* End of list */ | |
996 | return NULL; | |
997 | } | |
998 | ||
999 | /* Called with sessions_mutex held. */ | |
1000 | static | |
1001 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1002 | { | |
1003 | struct lttng_session *session = m->private; | |
1004 | struct lttng_pid_tracker *lpf; | |
1005 | struct lttng_pid_hash_node *e; | |
1006 | int iter = 0, i; | |
1007 | ||
1008 | (*ppos)++; | |
1009 | lpf = session->pid_tracker; | |
1010 | if (lpf) { | |
1011 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1012 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1013 | ||
f934e302 | 1014 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1015 | if (iter++ >= *ppos) |
1016 | return e; | |
1017 | } | |
1018 | } | |
1019 | } else { | |
1020 | /* PID tracker disabled. */ | |
1021 | if (iter >= *ppos && iter == 0) | |
1022 | return session; /* empty tracker */ | |
1023 | iter++; | |
1024 | } | |
1025 | ||
1026 | /* End of list */ | |
1027 | return NULL; | |
1028 | } | |
1029 | ||
1030 | static | |
1031 | void pid_list_stop(struct seq_file *m, void *p) | |
1032 | { | |
1033 | mutex_unlock(&sessions_mutex); | |
1034 | } | |
1035 | ||
1036 | static | |
1037 | int pid_list_show(struct seq_file *m, void *p) | |
1038 | { | |
1039 | int pid; | |
1040 | ||
1041 | if (p == m->private) { | |
1042 | /* Tracker disabled. */ | |
1043 | pid = -1; | |
1044 | } else { | |
1045 | const struct lttng_pid_hash_node *e = p; | |
1046 | ||
1047 | pid = lttng_pid_tracker_get_node_pid(e); | |
1048 | } | |
1049 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static | |
1054 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1055 | .start = pid_list_start, | |
1056 | .next = pid_list_next, | |
1057 | .stop = pid_list_stop, | |
1058 | .show = pid_list_show, | |
1059 | }; | |
1060 | ||
1061 | static | |
1062 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1063 | { | |
1064 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1065 | } | |
1066 | ||
1067 | static | |
1068 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1069 | { | |
1070 | struct seq_file *m = file->private_data; | |
1071 | struct lttng_session *session = m->private; | |
1072 | int ret; | |
1073 | ||
1074 | WARN_ON_ONCE(!session); | |
1075 | ret = seq_release(inode, file); | |
1076 | if (!ret && session) | |
1077 | fput(session->file); | |
1078 | return ret; | |
1079 | } | |
1080 | ||
1081 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1082 | .owner = THIS_MODULE, | |
1083 | .open = lttng_tracker_pids_list_open, | |
1084 | .read = seq_read, | |
1085 | .llseek = seq_lseek, | |
1086 | .release = lttng_tracker_pids_list_release, | |
1087 | }; | |
1088 | ||
1089 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1090 | { | |
1091 | struct file *tracker_pids_list_file; | |
1092 | struct seq_file *m; | |
1093 | int file_fd, ret; | |
1094 | ||
1095 | file_fd = lttng_get_unused_fd(); | |
1096 | if (file_fd < 0) { | |
1097 | ret = file_fd; | |
1098 | goto fd_error; | |
1099 | } | |
1100 | ||
1101 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1102 | <tng_tracker_pids_list_fops, | |
1103 | NULL, O_RDWR); | |
1104 | if (IS_ERR(tracker_pids_list_file)) { | |
1105 | ret = PTR_ERR(tracker_pids_list_file); | |
1106 | goto file_error; | |
1107 | } | |
9c1f4643 MD |
1108 | if (atomic_long_add_unless(&session->file->f_count, |
1109 | 1, INT_MAX) == INT_MAX) { | |
1110 | goto refcount_error; | |
1111 | } | |
7e6f9ef6 MD |
1112 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1113 | if (ret < 0) | |
1114 | goto open_error; | |
1115 | m = tracker_pids_list_file->private_data; | |
1116 | m->private = session; | |
1117 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1118 | |
1119 | return file_fd; | |
1120 | ||
1121 | open_error: | |
9c1f4643 MD |
1122 | atomic_long_dec(&session->file->f_count); |
1123 | refcount_error: | |
7e6f9ef6 MD |
1124 | fput(tracker_pids_list_file); |
1125 | file_error: | |
1126 | put_unused_fd(file_fd); | |
1127 | fd_error: | |
1128 | return ret; | |
1129 | } | |
1130 | ||
3c997079 MD |
1131 | /* |
1132 | * Enabler management. | |
1133 | */ | |
1134 | static | |
4ecb5ad5 MD |
1135 | int lttng_match_enabler_wildcard(const char *desc_name, |
1136 | const char *name) | |
3c997079 | 1137 | { |
3c997079 | 1138 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1139 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1140 | return 0; |
1141 | return 1; | |
1142 | } | |
1143 | ||
1144 | static | |
4ecb5ad5 MD |
1145 | int lttng_match_enabler_name(const char *desc_name, |
1146 | const char *name) | |
3c997079 | 1147 | { |
4ecb5ad5 | 1148 | if (strcmp(desc_name, name)) |
3c997079 MD |
1149 | return 0; |
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | static | |
1154 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1155 | struct lttng_enabler *enabler) | |
1156 | { | |
4ecb5ad5 MD |
1157 | const char *desc_name, *enabler_name; |
1158 | ||
1159 | enabler_name = enabler->event_param.name; | |
1160 | switch (enabler->event_param.instrumentation) { | |
1161 | case LTTNG_KERNEL_TRACEPOINT: | |
1162 | desc_name = desc->name; | |
1163 | break; | |
1164 | case LTTNG_KERNEL_SYSCALL: | |
1165 | desc_name = desc->name; | |
1166 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1167 | desc_name += strlen("compat_"); | |
1168 | if (!strncmp(desc_name, "syscall_exit_", | |
1169 | strlen("syscall_exit_"))) { | |
1170 | desc_name += strlen("syscall_exit_"); | |
1171 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1172 | strlen("syscall_entry_"))) { | |
1173 | desc_name += strlen("syscall_entry_"); | |
1174 | } else { | |
1175 | WARN_ON_ONCE(1); | |
1176 | return -EINVAL; | |
1177 | } | |
1178 | break; | |
1179 | default: | |
1180 | WARN_ON_ONCE(1); | |
1181 | return -EINVAL; | |
1182 | } | |
3c997079 MD |
1183 | switch (enabler->type) { |
1184 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1185 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1186 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1187 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1188 | default: |
1189 | return -EINVAL; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | static | |
1194 | int lttng_event_match_enabler(struct lttng_event *event, | |
1195 | struct lttng_enabler *enabler) | |
1196 | { | |
33a39a3c MD |
1197 | if (enabler->event_param.instrumentation != event->instrumentation) |
1198 | return 0; | |
3c997079 MD |
1199 | if (lttng_desc_match_enabler(event->desc, enabler) |
1200 | && event->chan == enabler->chan) | |
1201 | return 1; | |
1202 | else | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static | |
1207 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1208 | struct lttng_enabler *enabler) | |
1209 | { | |
1210 | struct lttng_enabler_ref *enabler_ref; | |
1211 | ||
1212 | list_for_each_entry(enabler_ref, | |
1213 | &event->enablers_ref_head, node) { | |
1214 | if (enabler_ref->ref == enabler) | |
1215 | return enabler_ref; | |
1216 | } | |
1217 | return NULL; | |
1218 | } | |
1219 | ||
3c997079 | 1220 | static |
33a39a3c | 1221 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1222 | { |
1223 | struct lttng_session *session = enabler->chan->session; | |
1224 | struct lttng_probe_desc *probe_desc; | |
1225 | const struct lttng_event_desc *desc; | |
1226 | int i; | |
1227 | struct list_head *probe_list; | |
1228 | ||
1229 | probe_list = lttng_get_probe_list_head(); | |
1230 | /* | |
1231 | * For each probe event, if we find that a probe event matches | |
1232 | * our enabler, create an associated lttng_event if not | |
1233 | * already present. | |
1234 | */ | |
1235 | list_for_each_entry(probe_desc, probe_list, head) { | |
1236 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1237 | int found = 0; | |
1238 | struct hlist_head *head; | |
1239 | const char *event_name; | |
1240 | size_t name_len; | |
1241 | uint32_t hash; | |
1242 | struct lttng_event *event; | |
1243 | ||
1244 | desc = probe_desc->event_desc[i]; | |
1245 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1246 | continue; | |
1247 | event_name = desc->name; | |
1248 | name_len = strlen(event_name); | |
1249 | ||
1250 | /* | |
1251 | * Check if already created. | |
1252 | */ | |
1253 | hash = jhash(event_name, name_len, 0); | |
1254 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1255 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1256 | if (event->desc == desc |
1257 | && event->chan == enabler->chan) | |
1258 | found = 1; | |
1259 | } | |
1260 | if (found) | |
1261 | continue; | |
1262 | ||
1263 | /* | |
1264 | * We need to create an event for this | |
1265 | * event probe. | |
1266 | */ | |
1267 | event = _lttng_event_create(enabler->chan, | |
1268 | NULL, NULL, desc, | |
1269 | LTTNG_KERNEL_TRACEPOINT); | |
1270 | if (!event) { | |
1271 | printk(KERN_INFO "Unable to create event %s\n", | |
1272 | probe_desc->event_desc[i]->name); | |
1273 | } | |
1274 | } | |
1275 | } | |
1276 | } | |
1277 | ||
33a39a3c MD |
1278 | static |
1279 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1280 | { | |
1281 | int ret; | |
1282 | ||
1283 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1284 | WARN_ON_ONCE(ret); | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * Create struct lttng_event if it is missing and present in the list of | |
1289 | * tracepoint probes. | |
1290 | * Should be called with sessions mutex held. | |
1291 | */ | |
1292 | static | |
1293 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1294 | { | |
1295 | switch (enabler->event_param.instrumentation) { | |
1296 | case LTTNG_KERNEL_TRACEPOINT: | |
1297 | lttng_create_tracepoint_if_missing(enabler); | |
1298 | break; | |
1299 | case LTTNG_KERNEL_SYSCALL: | |
1300 | lttng_create_syscall_if_missing(enabler); | |
1301 | break; | |
1302 | default: | |
1303 | WARN_ON_ONCE(1); | |
1304 | break; | |
1305 | } | |
1306 | } | |
1307 | ||
3c997079 MD |
1308 | /* |
1309 | * Create events associated with an enabler (if not already present), | |
1310 | * and add backward reference from the event to the enabler. | |
1311 | * Should be called with sessions mutex held. | |
1312 | */ | |
1313 | static | |
1314 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1315 | { | |
1316 | struct lttng_session *session = enabler->chan->session; | |
1317 | struct lttng_event *event; | |
1318 | ||
1319 | /* First ensure that probe events are created for this enabler. */ | |
1320 | lttng_create_event_if_missing(enabler); | |
1321 | ||
1322 | /* For each event matching enabler in session event list. */ | |
1323 | list_for_each_entry(event, &session->events, list) { | |
1324 | struct lttng_enabler_ref *enabler_ref; | |
1325 | ||
1326 | if (!lttng_event_match_enabler(event, enabler)) | |
1327 | continue; | |
1328 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1329 | if (!enabler_ref) { | |
1330 | /* | |
1331 | * If no backward ref, create it. | |
1332 | * Add backward ref from event to enabler. | |
1333 | */ | |
1334 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1335 | if (!enabler_ref) | |
1336 | return -ENOMEM; | |
1337 | enabler_ref->ref = enabler; | |
1338 | list_add(&enabler_ref->node, | |
1339 | &event->enablers_ref_head); | |
1340 | } | |
1341 | ||
f127e61e MD |
1342 | /* |
1343 | * Link filter bytecodes if not linked yet. | |
1344 | */ | |
1345 | lttng_enabler_event_link_bytecode(event, enabler); | |
1346 | ||
3c997079 MD |
1347 | /* TODO: merge event context. */ |
1348 | } | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Called at module load: connect the probe on all enablers matching | |
1354 | * this event. | |
1355 | * Called with sessions lock held. | |
1356 | */ | |
1357 | int lttng_fix_pending_events(void) | |
1358 | { | |
1359 | struct lttng_session *session; | |
1360 | ||
1361 | list_for_each_entry(session, &sessions, list) | |
1362 | lttng_session_lazy_sync_enablers(session); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1367 | struct lttng_kernel_event *event_param, | |
1368 | struct lttng_channel *chan) | |
1369 | { | |
1370 | struct lttng_enabler *enabler; | |
1371 | ||
1372 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1373 | if (!enabler) | |
1374 | return NULL; | |
1375 | enabler->type = type; | |
07dfc1d0 | 1376 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1377 | memcpy(&enabler->event_param, event_param, |
1378 | sizeof(enabler->event_param)); | |
1379 | enabler->chan = chan; | |
1380 | /* ctx left NULL */ | |
4fd19d8a | 1381 | enabler->enabled = 0; |
3c997079 MD |
1382 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1383 | mutex_lock(&sessions_mutex); | |
1384 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1385 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1386 | mutex_unlock(&sessions_mutex); | |
1387 | return enabler; | |
1388 | } | |
1389 | ||
1390 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1391 | { | |
1392 | mutex_lock(&sessions_mutex); | |
1393 | enabler->enabled = 1; | |
1394 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1395 | mutex_unlock(&sessions_mutex); | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1400 | { | |
1401 | mutex_lock(&sessions_mutex); | |
1402 | enabler->enabled = 0; | |
1403 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1404 | mutex_unlock(&sessions_mutex); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
07dfc1d0 MD |
1408 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1409 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1410 | { | |
1411 | struct lttng_filter_bytecode_node *bytecode_node; | |
1412 | uint32_t bytecode_len; | |
1413 | int ret; | |
1414 | ||
1415 | ret = get_user(bytecode_len, &bytecode->len); | |
1416 | if (ret) | |
1417 | return ret; | |
1418 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1419 | GFP_KERNEL); | |
1420 | if (!bytecode_node) | |
1421 | return -ENOMEM; | |
1422 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1423 | sizeof(*bytecode) + bytecode_len); | |
1424 | if (ret) | |
1425 | goto error_free; | |
1426 | bytecode_node->enabler = enabler; | |
1427 | /* Enforce length based on allocated size */ | |
1428 | bytecode_node->bc.len = bytecode_len; | |
1429 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1430 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1431 | return 0; | |
1432 | ||
1433 | error_free: | |
1434 | kfree(bytecode_node); | |
1435 | return ret; | |
1436 | } | |
1437 | ||
3c997079 MD |
1438 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1439 | struct lttng_kernel_context *context_param) | |
1440 | { | |
1441 | return -ENOSYS; | |
1442 | } | |
1443 | ||
1444 | static | |
1445 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1446 | { | |
07dfc1d0 MD |
1447 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1448 | ||
1449 | /* Destroy filter bytecode */ | |
1450 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1451 | &enabler->filter_bytecode_head, node) { | |
1452 | kfree(filter_node); | |
1453 | } | |
1454 | ||
3c997079 MD |
1455 | /* Destroy contexts */ |
1456 | lttng_destroy_context(enabler->ctx); | |
1457 | ||
1458 | list_del(&enabler->node); | |
1459 | kfree(enabler); | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * lttng_session_sync_enablers should be called just before starting a | |
1464 | * session. | |
1465 | * Should be called with sessions mutex held. | |
1466 | */ | |
1467 | static | |
1468 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1469 | { | |
1470 | struct lttng_enabler *enabler; | |
1471 | struct lttng_event *event; | |
1472 | ||
1473 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1474 | lttng_enabler_ref_events(enabler); | |
1475 | /* | |
1476 | * For each event, if at least one of its enablers is enabled, | |
1477 | * and its channel and session transient states are enabled, we | |
1478 | * enable the event, else we disable it. | |
1479 | */ | |
1480 | list_for_each_entry(event, &session->events, list) { | |
1481 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1482 | struct lttng_bytecode_runtime *runtime; |
1483 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1484 | |
4ecb5ad5 MD |
1485 | switch (event->instrumentation) { |
1486 | case LTTNG_KERNEL_TRACEPOINT: | |
1487 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1488 | /* Enable events */ |
1489 | list_for_each_entry(enabler_ref, | |
1490 | &event->enablers_ref_head, node) { | |
1491 | if (enabler_ref->ref->enabled) { | |
1492 | enabled = 1; | |
1493 | break; | |
1494 | } | |
1495 | } | |
4ecb5ad5 MD |
1496 | break; |
1497 | default: | |
3c997079 MD |
1498 | /* Not handled with lazy sync. */ |
1499 | continue; | |
1500 | } | |
1501 | /* | |
1502 | * Enabled state is based on union of enablers, with | |
1503 | * intesection of session and channel transient enable | |
1504 | * states. | |
1505 | */ | |
1506 | enabled = enabled && session->tstate && event->chan->tstate; | |
1507 | ||
1508 | ACCESS_ONCE(event->enabled) = enabled; | |
1509 | /* | |
1510 | * Sync tracepoint registration with event enabled | |
1511 | * state. | |
1512 | */ | |
1513 | if (enabled) { | |
1514 | register_event(event); | |
1515 | } else { | |
1516 | _lttng_event_unregister(event); | |
1517 | } | |
07dfc1d0 MD |
1518 | |
1519 | /* Check if has enablers without bytecode enabled */ | |
1520 | list_for_each_entry(enabler_ref, | |
1521 | &event->enablers_ref_head, node) { | |
1522 | if (enabler_ref->ref->enabled | |
1523 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1524 | has_enablers_without_bytecode = 1; | |
1525 | break; | |
1526 | } | |
1527 | } | |
1528 | event->has_enablers_without_bytecode = | |
1529 | has_enablers_without_bytecode; | |
1530 | ||
1531 | /* Enable filters */ | |
1532 | list_for_each_entry(runtime, | |
f127e61e | 1533 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1534 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1535 | } |
1536 | } | |
1537 | ||
1538 | /* | |
1539 | * Apply enablers to session events, adding events to session if need | |
1540 | * be. It is required after each modification applied to an active | |
1541 | * session, and right before session "start". | |
1542 | * "lazy" sync means we only sync if required. | |
1543 | * Should be called with sessions mutex held. | |
1544 | */ | |
1545 | static | |
1546 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1547 | { | |
1548 | /* We can skip if session is not active */ | |
1549 | if (!session->active) | |
1550 | return; | |
1551 | lttng_session_sync_enablers(session); | |
1552 | } | |
1553 | ||
1ec3f75a | 1554 | /* |
d83004aa JD |
1555 | * Serialize at most one packet worth of metadata into a metadata |
1556 | * channel. | |
92d9f5e6 MD |
1557 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1558 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1559 | * allows us to do racy operations such as looking for remaining space left in | |
1560 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1561 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1562 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1563 | * Returns the number of bytes written in the channel, 0 if no data |
1564 | * was written and a negative value on error. | |
1ec3f75a | 1565 | */ |
b3b8072b MD |
1566 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1567 | struct channel *chan) | |
d83004aa JD |
1568 | { |
1569 | struct lib_ring_buffer_ctx ctx; | |
1570 | int ret = 0; | |
1571 | size_t len, reserve_len; | |
1572 | ||
f613e3e6 | 1573 | /* |
92d9f5e6 MD |
1574 | * Ensure we support mutiple get_next / put sequences followed by |
1575 | * put_next. The metadata cache lock protects reading the metadata | |
1576 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1577 | * "flush" operations on the buffer invoked by different processes. | |
1578 | * Moreover, since the metadata cache memory can be reallocated, we | |
1579 | * need to have exclusive access against updates even though we only | |
1580 | * read it. | |
f613e3e6 | 1581 | */ |
92d9f5e6 | 1582 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1583 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1584 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1585 | goto end; |
f613e3e6 | 1586 | |
9616f0bf JD |
1587 | /* Metadata regenerated, change the version. */ |
1588 | if (stream->metadata_cache->version != stream->version) | |
1589 | stream->version = stream->metadata_cache->version; | |
1590 | ||
d83004aa | 1591 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1592 | stream->metadata_in; |
9de2c215 | 1593 | if (!len) |
de23d59d | 1594 | goto end; |
d83004aa | 1595 | reserve_len = min_t(size_t, |
b3b8072b | 1596 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1597 | len); |
b3b8072b | 1598 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1599 | sizeof(char), -1); |
1600 | /* | |
1601 | * If reservation failed, return an error to the caller. | |
1602 | */ | |
b3b8072b | 1603 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1604 | if (ret != 0) { |
1605 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1606 | goto end; | |
1607 | } | |
b3b8072b | 1608 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1609 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1610 | reserve_len); |
b3b8072b | 1611 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1612 | stream->metadata_in += reserve_len; |
d83004aa JD |
1613 | ret = reserve_len; |
1614 | ||
1615 | end: | |
92d9f5e6 | 1616 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1617 | return ret; |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Write the metadata to the metadata cache. | |
1622 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1623 | * The metadata cache lock protects us from concurrent read access from |
1624 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1625 | */ |
a90917c3 | 1626 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1627 | const char *fmt, ...) |
1628 | { | |
c099397a | 1629 | char *str; |
d83004aa | 1630 | size_t len; |
c099397a | 1631 | va_list ap; |
d83004aa | 1632 | struct lttng_metadata_stream *stream; |
c099397a MD |
1633 | |
1634 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1635 | ||
1636 | va_start(ap, fmt); | |
1637 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1638 | va_end(ap); | |
1639 | if (!str) | |
1640 | return -ENOMEM; | |
1641 | ||
1ec3f75a | 1642 | len = strlen(str); |
92d9f5e6 | 1643 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1644 | if (session->metadata_cache->metadata_written + len > |
1645 | session->metadata_cache->cache_alloc) { | |
1646 | char *tmp_cache_realloc; | |
1647 | unsigned int tmp_cache_alloc_size; | |
1648 | ||
1649 | tmp_cache_alloc_size = max_t(unsigned int, | |
1650 | session->metadata_cache->cache_alloc + len, | |
1651 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1652 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1653 | if (!tmp_cache_realloc) |
1654 | goto err; | |
a606b6e8 ML |
1655 | if (session->metadata_cache->data) { |
1656 | memcpy(tmp_cache_realloc, | |
1657 | session->metadata_cache->data, | |
1658 | session->metadata_cache->cache_alloc); | |
1659 | vfree(session->metadata_cache->data); | |
1660 | } | |
1661 | ||
d83004aa JD |
1662 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1663 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1664 | } |
d83004aa JD |
1665 | memcpy(session->metadata_cache->data + |
1666 | session->metadata_cache->metadata_written, | |
1667 | str, len); | |
1668 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1669 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1670 | kfree(str); |
d83004aa JD |
1671 | |
1672 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1673 | wake_up_interruptible(&stream->read_wait); | |
1674 | ||
1675 | return 0; | |
1676 | ||
1677 | err: | |
92d9f5e6 | 1678 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1679 | kfree(str); |
1680 | return -ENOMEM; | |
c099397a MD |
1681 | } |
1682 | ||
f513b2bf MD |
1683 | static |
1684 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1685 | { | |
1686 | size_t i; | |
1687 | ||
1688 | for (i = 0; i < nesting; i++) { | |
1689 | int ret; | |
1690 | ||
1691 | ret = lttng_metadata_printf(session, " "); | |
1692 | if (ret) { | |
1693 | return ret; | |
1694 | } | |
1695 | } | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * Must be called with sessions_mutex held. | |
1701 | */ | |
1702 | static | |
1703 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1704 | const struct lttng_type *type, | |
1705 | size_t nesting) | |
1706 | { | |
1707 | int ret; | |
1708 | uint32_t i, nr_fields; | |
1709 | ||
1710 | ret = print_tabs(session, nesting); | |
1711 | if (ret) | |
1712 | return ret; | |
1713 | ret = lttng_metadata_printf(session, | |
1714 | "struct {\n"); | |
1715 | if (ret) | |
1716 | return ret; | |
1717 | nr_fields = type->u._struct.nr_fields; | |
1718 | for (i = 0; i < nr_fields; i++) { | |
1719 | const struct lttng_event_field *iter_field; | |
1720 | ||
1721 | iter_field = &type->u._struct.fields[i]; | |
1722 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1723 | if (ret) | |
1724 | return ret; | |
1725 | } | |
1726 | ret = print_tabs(session, nesting); | |
1727 | if (ret) | |
1728 | return ret; | |
1729 | ret = lttng_metadata_printf(session, | |
1730 | "}"); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * Must be called with sessions_mutex held. | |
1736 | */ | |
1737 | static | |
1738 | int _lttng_struct_statedump(struct lttng_session *session, | |
1739 | const struct lttng_event_field *field, | |
1740 | size_t nesting) | |
1741 | { | |
1742 | int ret; | |
1743 | ||
1744 | ret = _lttng_struct_type_statedump(session, | |
1745 | &field->type, nesting); | |
1746 | if (ret) | |
1747 | return ret; | |
1748 | ret = lttng_metadata_printf(session, | |
1749 | "_%s;\n", | |
1750 | field->name); | |
1751 | return ret; | |
1752 | } | |
1753 | ||
65c85aa6 MD |
1754 | /* |
1755 | * Must be called with sessions_mutex held. | |
1756 | */ | |
1757 | static | |
1758 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1759 | const struct lttng_type *type, | |
1760 | size_t nesting) | |
1761 | { | |
1762 | int ret; | |
1763 | uint32_t i, nr_choices; | |
1764 | ||
1765 | ret = print_tabs(session, nesting); | |
1766 | if (ret) | |
1767 | return ret; | |
1768 | ret = lttng_metadata_printf(session, | |
1769 | "variant <_%s> {\n", | |
1770 | type->u.variant.tag_name); | |
1771 | if (ret) | |
1772 | return ret; | |
1773 | nr_choices = type->u.variant.nr_choices; | |
1774 | for (i = 0; i < nr_choices; i++) { | |
1775 | const struct lttng_event_field *iter_field; | |
1776 | ||
1777 | iter_field = &type->u.variant.choices[i]; | |
1778 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1779 | if (ret) | |
1780 | return ret; | |
1781 | } | |
1782 | ret = print_tabs(session, nesting); | |
1783 | if (ret) | |
1784 | return ret; | |
1785 | ret = lttng_metadata_printf(session, | |
1786 | "}"); | |
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Must be called with sessions_mutex held. | |
1792 | */ | |
1793 | static | |
1794 | int _lttng_variant_statedump(struct lttng_session *session, | |
1795 | const struct lttng_event_field *field, | |
1796 | size_t nesting) | |
1797 | { | |
1798 | int ret; | |
1799 | ||
1800 | ret = _lttng_variant_type_statedump(session, | |
1801 | &field->type, nesting); | |
1802 | if (ret) | |
1803 | return ret; | |
1804 | ret = lttng_metadata_printf(session, | |
1805 | "_%s;\n", | |
1806 | field->name); | |
1807 | return ret; | |
1808 | } | |
1809 | ||
f513b2bf MD |
1810 | /* |
1811 | * Must be called with sessions_mutex held. | |
1812 | */ | |
1813 | static | |
1814 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1815 | const struct lttng_event_field *field, | |
1816 | size_t nesting) | |
1817 | { | |
1818 | int ret; | |
1819 | const struct lttng_type *elem_type; | |
1820 | ||
65c85aa6 | 1821 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1822 | elem_type = field->type.u.array_compound.elem_type; |
1823 | switch (elem_type->atype) { | |
1824 | case atype_struct: | |
1825 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1826 | if (ret) | |
1827 | return ret; | |
1828 | break; | |
65c85aa6 MD |
1829 | case atype_variant: |
1830 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1831 | if (ret) | |
1832 | return ret; | |
1833 | break; | |
f513b2bf MD |
1834 | default: |
1835 | return -EINVAL; | |
1836 | } | |
1837 | ret = lttng_metadata_printf(session, | |
1838 | " _%s[%u];\n", | |
1839 | field->name, | |
1840 | field->type.u.array_compound.length); | |
1841 | return ret; | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Must be called with sessions_mutex held. | |
1846 | */ | |
1847 | static | |
1848 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1849 | const struct lttng_event_field *field, | |
1850 | size_t nesting) | |
1851 | { | |
1852 | int ret; | |
1853 | const char *length_name; | |
1854 | const struct lttng_type *elem_type; | |
1855 | ||
1856 | length_name = field->type.u.sequence_compound.length_name; | |
1857 | ||
65c85aa6 | 1858 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1859 | elem_type = field->type.u.sequence_compound.elem_type; |
1860 | switch (elem_type->atype) { | |
1861 | case atype_struct: | |
1862 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1863 | if (ret) | |
1864 | return ret; | |
1865 | break; | |
65c85aa6 MD |
1866 | case atype_variant: |
1867 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1868 | if (ret) | |
1869 | return ret; | |
1870 | break; | |
f513b2bf MD |
1871 | default: |
1872 | return -EINVAL; | |
1873 | } | |
1874 | ret = lttng_metadata_printf(session, | |
1875 | " _%s[ _%s ];\n", | |
1876 | field->name, | |
1877 | length_name); | |
1878 | return ret; | |
1879 | } | |
1880 | ||
141ddf28 MD |
1881 | /* |
1882 | * Must be called with sessions_mutex held. | |
1883 | */ | |
1884 | static | |
1885 | int _lttng_enum_statedump(struct lttng_session *session, | |
1886 | const struct lttng_event_field *field, | |
1887 | size_t nesting) | |
1888 | { | |
1889 | const struct lttng_enum_desc *enum_desc; | |
1890 | const struct lttng_integer_type *container_type; | |
1891 | int ret; | |
1892 | unsigned int i, nr_entries; | |
1893 | ||
1894 | enum_desc = field->type.u.basic.enumeration.desc; | |
1895 | container_type = &field->type.u.basic.enumeration.container_type; | |
1896 | nr_entries = enum_desc->nr_entries; | |
1897 | ||
1898 | ret = print_tabs(session, nesting); | |
1899 | if (ret) | |
1900 | goto end; | |
1901 | ret = lttng_metadata_printf(session, | |
1902 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u; } {\n", | |
1903 | container_type->size, | |
1904 | container_type->alignment, | |
1905 | container_type->signedness, | |
1906 | (container_type->encoding == lttng_encode_none) | |
1907 | ? "none" | |
1908 | : (container_type->encoding == lttng_encode_UTF8) | |
1909 | ? "UTF8" | |
1910 | : "ASCII", | |
1911 | container_type->base); | |
1912 | if (ret) | |
1913 | goto end; | |
1914 | /* Dump all entries */ | |
1915 | for (i = 0; i < nr_entries; i++) { | |
1916 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1917 | int j, len; | |
1918 | ||
1919 | ret = print_tabs(session, nesting + 1); | |
1920 | if (ret) | |
1921 | goto end; | |
1922 | ret = lttng_metadata_printf(session, | |
1923 | "\""); | |
1924 | if (ret) | |
1925 | goto end; | |
1926 | len = strlen(entry->string); | |
1927 | /* Escape the character '"' */ | |
1928 | for (j = 0; j < len; j++) { | |
1929 | char c = entry->string[j]; | |
1930 | ||
1931 | switch (c) { | |
1932 | case '"': | |
1933 | ret = lttng_metadata_printf(session, | |
1934 | "\\\""); | |
1935 | break; | |
1936 | case '\\': | |
1937 | ret = lttng_metadata_printf(session, | |
1938 | "\\\\"); | |
1939 | break; | |
1940 | default: | |
1941 | ret = lttng_metadata_printf(session, | |
1942 | "%c", c); | |
1943 | break; | |
1944 | } | |
1945 | if (ret) | |
1946 | goto end; | |
1947 | } | |
1948 | ret = lttng_metadata_printf(session, | |
1949 | "\" = "); | |
1950 | if (ret) | |
1951 | goto end; | |
1952 | if (entry->start.signedness) | |
1953 | ret = lttng_metadata_printf(session, | |
1954 | "%lld", (long long) entry->start.value); | |
1955 | else | |
1956 | ret = lttng_metadata_printf(session, | |
1957 | "%llu", entry->start.value); | |
1958 | if (ret) | |
1959 | goto end; | |
1960 | if (entry->start.signedness == entry->end.signedness && | |
1961 | entry->start.value == entry->end.value) { | |
1962 | ret = lttng_metadata_printf(session, | |
1963 | ",\n"); | |
1964 | } else { | |
1965 | if (entry->end.signedness) { | |
1966 | ret = lttng_metadata_printf(session, | |
1967 | " ... %lld,\n", (long long) entry->end.value); | |
1968 | } else { | |
1969 | ret = lttng_metadata_printf(session, | |
1970 | " ... %llu,\n", entry->end.value); | |
1971 | } | |
1972 | } | |
1973 | if (ret) | |
1974 | goto end; | |
1975 | } | |
1976 | ret = print_tabs(session, nesting); | |
1977 | if (ret) | |
1978 | goto end; | |
1979 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
1980 | field->name); | |
1981 | end: | |
1982 | return ret; | |
1983 | } | |
1984 | ||
d83004aa JD |
1985 | /* |
1986 | * Must be called with sessions_mutex held. | |
1987 | */ | |
c099397a | 1988 | static |
a90917c3 | 1989 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1990 | const struct lttng_event_field *field, |
1991 | size_t nesting) | |
c099397a | 1992 | { |
c099397a | 1993 | int ret = 0; |
c099397a | 1994 | |
8070f5c0 MD |
1995 | switch (field->type.atype) { |
1996 | case atype_integer: | |
f513b2bf MD |
1997 | ret = print_tabs(session, nesting); |
1998 | if (ret) | |
1999 | return ret; | |
8070f5c0 | 2000 | ret = lttng_metadata_printf(session, |
f513b2bf | 2001 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2002 | field->type.u.basic.integer.size, |
2003 | field->type.u.basic.integer.alignment, | |
2004 | field->type.u.basic.integer.signedness, | |
2005 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2006 | ? "none" | |
2007 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2008 | ? "UTF8" | |
2009 | : "ASCII", | |
2010 | field->type.u.basic.integer.base, | |
5214fa50 | 2011 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2012 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2013 | #else |
8070f5c0 | 2014 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2015 | #endif |
8070f5c0 MD |
2016 | field->name); |
2017 | break; | |
2018 | case atype_enum: | |
141ddf28 | 2019 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2020 | break; |
2021 | case atype_array: | |
2022 | { | |
2023 | const struct lttng_basic_type *elem_type; | |
2024 | ||
2025 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2026 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2027 | ret = print_tabs(session, nesting); |
2028 | if (ret) | |
2029 | return ret; | |
43803cf2 | 2030 | ret = lttng_metadata_printf(session, |
f513b2bf | 2031 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2032 | field->type.u.array.elem_alignment * CHAR_BIT, |
2033 | field->name); | |
2034 | if (ret) | |
2035 | return ret; | |
2036 | } | |
f513b2bf MD |
2037 | ret = print_tabs(session, nesting); |
2038 | if (ret) | |
2039 | return ret; | |
8070f5c0 | 2040 | ret = lttng_metadata_printf(session, |
f513b2bf | 2041 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2042 | elem_type->u.basic.integer.size, |
2043 | elem_type->u.basic.integer.alignment, | |
2044 | elem_type->u.basic.integer.signedness, | |
2045 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2046 | ? "none" | |
2047 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2048 | ? "UTF8" | |
2049 | : "ASCII", | |
2050 | elem_type->u.basic.integer.base, | |
5214fa50 | 2051 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2052 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2053 | #else |
8070f5c0 | 2054 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2055 | #endif |
8070f5c0 MD |
2056 | field->name, field->type.u.array.length); |
2057 | break; | |
2058 | } | |
2059 | case atype_sequence: | |
2060 | { | |
2061 | const struct lttng_basic_type *elem_type; | |
2062 | const struct lttng_basic_type *length_type; | |
2063 | ||
2064 | elem_type = &field->type.u.sequence.elem_type; | |
2065 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2066 | ret = print_tabs(session, nesting); |
2067 | if (ret) | |
2068 | return ret; | |
8070f5c0 | 2069 | ret = lttng_metadata_printf(session, |
f513b2bf | 2070 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2071 | length_type->u.basic.integer.size, |
32257272 | 2072 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2073 | length_type->u.basic.integer.signedness, |
2074 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2075 | ? "none" | |
0635cdd4 | 2076 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2077 | ? "UTF8" |
0635cdd4 | 2078 | : "ASCII"), |
8070f5c0 | 2079 | length_type->u.basic.integer.base, |
5214fa50 | 2080 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2081 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2082 | #else |
0635cdd4 | 2083 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2084 | #endif |
27d2368e MD |
2085 | field->name); |
2086 | if (ret) | |
2087 | return ret; | |
2088 | ||
43803cf2 | 2089 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2090 | ret = print_tabs(session, nesting); |
2091 | if (ret) | |
2092 | return ret; | |
43803cf2 | 2093 | ret = lttng_metadata_printf(session, |
f513b2bf | 2094 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2095 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2096 | field->name); | |
2097 | if (ret) | |
2098 | return ret; | |
2099 | } | |
f513b2bf MD |
2100 | ret = print_tabs(session, nesting); |
2101 | if (ret) | |
2102 | return ret; | |
27d2368e | 2103 | ret = lttng_metadata_printf(session, |
f513b2bf | 2104 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2105 | elem_type->u.basic.integer.size, |
32257272 | 2106 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2107 | elem_type->u.basic.integer.signedness, |
2108 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2109 | ? "none" | |
0635cdd4 | 2110 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2111 | ? "UTF8" |
0635cdd4 | 2112 | : "ASCII"), |
8070f5c0 | 2113 | elem_type->u.basic.integer.base, |
5214fa50 | 2114 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2115 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2116 | #else |
8070f5c0 | 2117 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2118 | #endif |
8070f5c0 | 2119 | field->name, |
27d2368e | 2120 | field->name); |
8070f5c0 MD |
2121 | break; |
2122 | } | |
c099397a | 2123 | |
8070f5c0 MD |
2124 | case atype_string: |
2125 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2126 | ret = print_tabs(session, nesting); |
2127 | if (ret) | |
2128 | return ret; | |
8070f5c0 | 2129 | ret = lttng_metadata_printf(session, |
f513b2bf | 2130 | "string%s _%s;\n", |
8070f5c0 MD |
2131 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2132 | " { encoding = ASCII; }" : "", | |
2133 | field->name); | |
2134 | break; | |
f513b2bf MD |
2135 | case atype_struct: |
2136 | ret = _lttng_struct_statedump(session, field, nesting); | |
2137 | break; | |
2138 | case atype_array_compound: | |
2139 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2140 | break; | |
2141 | case atype_sequence_compound: | |
2142 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2143 | break; | |
65c85aa6 MD |
2144 | case atype_variant: |
2145 | ret = _lttng_variant_statedump(session, field, nesting); | |
2146 | break; | |
f513b2bf | 2147 | |
8070f5c0 MD |
2148 | default: |
2149 | WARN_ON_ONCE(1); | |
2150 | return -EINVAL; | |
2151 | } | |
2152 | return ret; | |
2153 | } | |
2154 | ||
2155 | static | |
a90917c3 | 2156 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2157 | struct lttng_ctx *ctx) |
2158 | { | |
2159 | int ret = 0; | |
2160 | int i; | |
2161 | ||
2162 | if (!ctx) | |
2163 | return 0; | |
2164 | for (i = 0; i < ctx->nr_fields; i++) { | |
2165 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2166 | ||
f513b2bf | 2167 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2168 | if (ret) |
2169 | return ret; | |
2170 | } | |
2171 | return ret; | |
2172 | } | |
2173 | ||
2174 | static | |
a90917c3 MD |
2175 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2176 | struct lttng_event *event) | |
8070f5c0 MD |
2177 | { |
2178 | const struct lttng_event_desc *desc = event->desc; | |
2179 | int ret = 0; | |
2180 | int i; | |
2181 | ||
2182 | for (i = 0; i < desc->nr_fields; i++) { | |
2183 | const struct lttng_event_field *field = &desc->fields[i]; | |
2184 | ||
f513b2bf | 2185 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2186 | if (ret) |
2187 | return ret; | |
c099397a MD |
2188 | } |
2189 | return ret; | |
2190 | } | |
2191 | ||
d83004aa JD |
2192 | /* |
2193 | * Must be called with sessions_mutex held. | |
2194 | */ | |
c099397a | 2195 | static |
a90917c3 MD |
2196 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2197 | struct lttng_channel *chan, | |
2198 | struct lttng_event *event) | |
c099397a MD |
2199 | { |
2200 | int ret = 0; | |
2201 | ||
2202 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2203 | return 0; | |
d83004aa | 2204 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2205 | return 0; |
2206 | ||
2207 | ret = lttng_metadata_printf(session, | |
2208 | "event {\n" | |
ae734547 | 2209 | " name = \"%s\";\n" |
c099397a | 2210 | " id = %u;\n" |
b9074a1b | 2211 | " stream_id = %u;\n", |
c099397a MD |
2212 | event->desc->name, |
2213 | event->id, | |
2214 | event->chan->id); | |
2215 | if (ret) | |
2216 | goto end; | |
2217 | ||
b9074a1b MD |
2218 | if (event->ctx) { |
2219 | ret = lttng_metadata_printf(session, | |
2220 | " context := struct {\n"); | |
2221 | if (ret) | |
2222 | goto end; | |
2223 | } | |
a90917c3 | 2224 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2225 | if (ret) |
2226 | goto end; | |
b9074a1b MD |
2227 | if (event->ctx) { |
2228 | ret = lttng_metadata_printf(session, | |
2229 | " };\n"); | |
2230 | if (ret) | |
2231 | goto end; | |
2232 | } | |
8070f5c0 MD |
2233 | |
2234 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2235 | " fields := struct {\n" |
2236 | ); | |
2237 | if (ret) | |
2238 | goto end; | |
2239 | ||
a90917c3 | 2240 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2241 | if (ret) |
2242 | goto end; | |
2243 | ||
2244 | /* | |
2245 | * LTTng space reservation can only reserve multiples of the | |
2246 | * byte size. | |
2247 | */ | |
2248 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2249 | " };\n" |
2250 | "};\n\n"); | |
c099397a MD |
2251 | if (ret) |
2252 | goto end; | |
2253 | ||
c099397a MD |
2254 | event->metadata_dumped = 1; |
2255 | end: | |
2256 | return ret; | |
2257 | ||
2258 | } | |
2259 | ||
d83004aa JD |
2260 | /* |
2261 | * Must be called with sessions_mutex held. | |
2262 | */ | |
c099397a | 2263 | static |
a90917c3 MD |
2264 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2265 | struct lttng_channel *chan) | |
c099397a MD |
2266 | { |
2267 | int ret = 0; | |
2268 | ||
2269 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2270 | return 0; | |
d83004aa JD |
2271 | |
2272 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2273 | return 0; |
2274 | ||
2275 | WARN_ON_ONCE(!chan->header_type); | |
2276 | ret = lttng_metadata_printf(session, | |
2277 | "stream {\n" | |
2278 | " id = %u;\n" | |
9115fbdc | 2279 | " event.header := %s;\n" |
b9074a1b | 2280 | " packet.context := struct packet_context;\n", |
c099397a MD |
2281 | chan->id, |
2282 | chan->header_type == 1 ? "struct event_header_compact" : | |
2283 | "struct event_header_large"); | |
2284 | if (ret) | |
2285 | goto end; | |
2286 | ||
b9074a1b MD |
2287 | if (chan->ctx) { |
2288 | ret = lttng_metadata_printf(session, | |
2289 | " event.context := struct {\n"); | |
2290 | if (ret) | |
2291 | goto end; | |
2292 | } | |
a90917c3 | 2293 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2294 | if (ret) |
2295 | goto end; | |
b9074a1b MD |
2296 | if (chan->ctx) { |
2297 | ret = lttng_metadata_printf(session, | |
2298 | " };\n"); | |
2299 | if (ret) | |
2300 | goto end; | |
2301 | } | |
8070f5c0 MD |
2302 | |
2303 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2304 | "};\n\n"); |
8070f5c0 | 2305 | |
c099397a MD |
2306 | chan->metadata_dumped = 1; |
2307 | end: | |
2308 | return ret; | |
2309 | } | |
2310 | ||
d83004aa JD |
2311 | /* |
2312 | * Must be called with sessions_mutex held. | |
2313 | */ | |
9115fbdc | 2314 | static |
a90917c3 | 2315 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2316 | { |
2317 | return lttng_metadata_printf(session, | |
2318 | "struct packet_context {\n" | |
a3ccff4f MD |
2319 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2320 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2321 | " uint64_t content_size;\n" |
2322 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2323 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2324 | " unsigned long events_discarded;\n" |
9115fbdc | 2325 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2326 | "};\n\n" |
9115fbdc MD |
2327 | ); |
2328 | } | |
2329 | ||
2330 | /* | |
2331 | * Compact header: | |
2332 | * id: range: 0 - 30. | |
2333 | * id 31 is reserved to indicate an extended header. | |
2334 | * | |
2335 | * Large header: | |
2336 | * id: range: 0 - 65534. | |
2337 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2338 | * |
2339 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2340 | */ |
2341 | static | |
a90917c3 | 2342 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2343 | { |
2344 | return lttng_metadata_printf(session, | |
2345 | "struct event_header_compact {\n" | |
2346 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2347 | " variant <id> {\n" | |
2348 | " struct {\n" | |
a3ccff4f | 2349 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2350 | " } compact;\n" |
2351 | " struct {\n" | |
2352 | " uint32_t id;\n" | |
a3ccff4f | 2353 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2354 | " } extended;\n" |
2355 | " } v;\n" | |
2356 | "} align(%u);\n" | |
2357 | "\n" | |
2358 | "struct event_header_large {\n" | |
2359 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2360 | " variant <id> {\n" | |
2361 | " struct {\n" | |
a3ccff4f | 2362 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2363 | " } compact;\n" |
2364 | " struct {\n" | |
2365 | " uint32_t id;\n" | |
a3ccff4f | 2366 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2367 | " } extended;\n" |
2368 | " } v;\n" | |
2369 | "} align(%u);\n\n", | |
a90917c3 MD |
2370 | lttng_alignof(uint32_t) * CHAR_BIT, |
2371 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2372 | ); |
2373 | } | |
2374 | ||
a3ccff4f MD |
2375 | /* |
2376 | * Approximation of NTP time of day to clock monotonic correlation, | |
2377 | * taken at start of trace. | |
2378 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2379 | * in future versions. | |
5283350b MD |
2380 | * This function may return a negative offset. It may happen if the |
2381 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2382 | */ |
2383 | static | |
8967b2a3 | 2384 | int64_t measure_clock_offset(void) |
a3ccff4f | 2385 | { |
dcb93448 | 2386 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2387 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2388 | int64_t offset; |
a3ccff4f MD |
2389 | struct timespec rts = { 0, 0 }; |
2390 | unsigned long flags; | |
2391 | ||
2392 | /* Disable interrupts to increase correlation precision. */ | |
2393 | local_irq_save(flags); | |
2394 | monotonic[0] = trace_clock_read64(); | |
2395 | getnstimeofday(&rts); | |
2396 | monotonic[1] = trace_clock_read64(); | |
2397 | local_irq_restore(flags); | |
2398 | ||
dcb93448 | 2399 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2400 | realtime = (uint64_t) rts.tv_sec * tcf; |
2401 | if (tcf == NSEC_PER_SEC) { | |
2402 | realtime += rts.tv_nsec; | |
2403 | } else { | |
2404 | uint64_t n = rts.tv_nsec * tcf; | |
2405 | ||
2406 | do_div(n, NSEC_PER_SEC); | |
2407 | realtime += n; | |
2408 | } | |
dcb93448 | 2409 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2410 | return offset; |
2411 | } | |
2412 | ||
c099397a MD |
2413 | /* |
2414 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2415 | * Must be called with sessions_mutex held. |
c099397a MD |
2416 | */ |
2417 | static | |
a90917c3 | 2418 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2419 | { |
30bdb6e4 | 2420 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2421 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2422 | struct lttng_channel *chan; |
2423 | struct lttng_event *event; | |
c099397a MD |
2424 | int ret = 0; |
2425 | ||
2426 | if (!ACCESS_ONCE(session->active)) | |
2427 | return 0; | |
2428 | if (session->metadata_dumped) | |
2429 | goto skip_session; | |
c099397a | 2430 | |
d793d5e1 | 2431 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2432 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2433 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2434 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2435 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2436 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2437 | |
2438 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2439 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2440 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2441 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2442 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2443 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2444 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2445 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2446 | "\n" |
2447 | "trace {\n" | |
2448 | " major = %u;\n" | |
2449 | " minor = %u;\n" | |
30bdb6e4 | 2450 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2451 | " byte_order = %s;\n" |
2452 | " packet.header := struct {\n" | |
2453 | " uint32_t magic;\n" | |
1ec3f75a | 2454 | " uint8_t uuid[16];\n" |
d793d5e1 | 2455 | " uint32_t stream_id;\n" |
5594698f | 2456 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2457 | " };\n" |
d793d5e1 | 2458 | "};\n\n", |
a90917c3 MD |
2459 | lttng_alignof(uint8_t) * CHAR_BIT, |
2460 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2461 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2462 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2463 | sizeof(unsigned long) * CHAR_BIT, |
2464 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2465 | CTF_SPEC_MAJOR, |
2466 | CTF_SPEC_MINOR, | |
d793d5e1 | 2467 | uuid_s, |
5214fa50 | 2468 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2469 | "be" |
2470 | #else | |
2471 | "le" | |
2472 | #endif | |
2473 | ); | |
2474 | if (ret) | |
2475 | goto end; | |
2476 | ||
99dc9597 MD |
2477 | ret = lttng_metadata_printf(session, |
2478 | "env {\n" | |
a6058143 | 2479 | " hostname = \"%s\";\n" |
c6c9e10f | 2480 | " domain = \"kernel\";\n" |
99dc9597 | 2481 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2482 | " kernel_release = \"%s\";\n" |
2483 | " kernel_version = \"%s\";\n" | |
2484 | " tracer_name = \"lttng-modules\";\n" | |
2485 | " tracer_major = %d;\n" | |
2486 | " tracer_minor = %d;\n" | |
2487 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2488 | "};\n\n", |
3d0d43db | 2489 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2490 | utsname()->sysname, |
2491 | utsname()->release, | |
c6c9e10f MD |
2492 | utsname()->version, |
2493 | LTTNG_MODULES_MAJOR_VERSION, | |
2494 | LTTNG_MODULES_MINOR_VERSION, | |
2495 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2496 | ); |
2497 | if (ret) | |
2498 | goto end; | |
2499 | ||
a3ccff4f MD |
2500 | ret = lttng_metadata_printf(session, |
2501 | "clock {\n" | |
2754583e MD |
2502 | " name = \"%s\";\n", |
2503 | trace_clock_name() | |
a82c63f1 MD |
2504 | ); |
2505 | if (ret) | |
2506 | goto end; | |
2507 | ||
2508 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2509 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2510 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2511 | clock_uuid_s |
2512 | ); | |
2513 | if (ret) | |
2514 | goto end; | |
2515 | } | |
2516 | ||
2517 | ret = lttng_metadata_printf(session, | |
2754583e | 2518 | " description = \"%s\";\n" |
a3ccff4f MD |
2519 | " freq = %llu; /* Frequency, in Hz */\n" |
2520 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2521 | " offset = %lld;\n" |
a3ccff4f | 2522 | "};\n\n", |
2754583e | 2523 | trace_clock_description(), |
a3ccff4f | 2524 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2525 | (long long) measure_clock_offset() |
a3ccff4f MD |
2526 | ); |
2527 | if (ret) | |
2528 | goto end; | |
2529 | ||
2530 | ret = lttng_metadata_printf(session, | |
2531 | "typealias integer {\n" | |
2532 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2533 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2534 | "} := uint27_clock_monotonic_t;\n" |
2535 | "\n" | |
2536 | "typealias integer {\n" | |
2537 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2538 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2539 | "} := uint32_clock_monotonic_t;\n" |
2540 | "\n" | |
2541 | "typealias integer {\n" | |
2542 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2543 | " map = clock.%s.value;\n" |
a3ccff4f | 2544 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2545 | trace_clock_name(), |
a3ccff4f | 2546 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2547 | trace_clock_name(), |
2548 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2549 | trace_clock_name() | |
a3ccff4f MD |
2550 | ); |
2551 | if (ret) | |
2552 | goto end; | |
2553 | ||
a90917c3 | 2554 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2555 | if (ret) |
2556 | goto end; | |
2557 | ||
a90917c3 | 2558 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2559 | if (ret) |
2560 | goto end; | |
2561 | ||
c099397a MD |
2562 | skip_session: |
2563 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2564 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2565 | if (ret) |
2566 | goto end; | |
2567 | } | |
2568 | ||
2569 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2570 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2571 | if (ret) |
2572 | goto end; | |
2573 | } | |
2574 | session->metadata_dumped = 1; | |
2575 | end: | |
2576 | return ret; | |
2577 | } | |
2578 | ||
c0e31d2e | 2579 | /** |
a90917c3 | 2580 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2581 | * @transport: transport structure |
2582 | * | |
2583 | * Registers a transport which can be used as output to extract the data out of | |
2584 | * LTTng. The module calling this registration function must ensure that no | |
2585 | * trap-inducing code will be executed by the transport functions. E.g. | |
2586 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2587 | * is made visible to the transport function. This registration acts as a | |
2588 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2589 | * after its registration must it synchronize the TLBs. | |
2590 | */ | |
a90917c3 | 2591 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2592 | { |
2593 | /* | |
2594 | * Make sure no page fault can be triggered by the module about to be | |
2595 | * registered. We deal with this here so we don't have to call | |
2596 | * vmalloc_sync_all() in each module's init. | |
2597 | */ | |
6d2a620c | 2598 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2599 | |
2600 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2601 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2602 | mutex_unlock(&sessions_mutex); |
2603 | } | |
a90917c3 | 2604 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2605 | |
2606 | /** | |
a90917c3 | 2607 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2608 | * @transport: transport structure |
2609 | */ | |
a90917c3 | 2610 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2611 | { |
2612 | mutex_lock(&sessions_mutex); | |
2613 | list_del(&transport->node); | |
2614 | mutex_unlock(&sessions_mutex); | |
2615 | } | |
a90917c3 | 2616 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2617 | |
a90917c3 | 2618 | static int __init lttng_events_init(void) |
4e3c1b9b | 2619 | { |
1c25284c MD |
2620 | int ret; |
2621 | ||
453b2495 JD |
2622 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2623 | if (ret) | |
2624 | return ret; | |
389d7070 | 2625 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2626 | if (ret) |
2627 | return ret; | |
2628 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2629 | if (ret) |
2630 | return ret; | |
2631 | ret = lttng_probes_init(); | |
389d7070 MD |
2632 | if (ret) |
2633 | return ret; | |
07dfc1d0 | 2634 | ret = lttng_context_init(); |
20591cf7 MD |
2635 | if (ret) |
2636 | return ret; | |
07dfc1d0 MD |
2637 | ret = lttng_tracepoint_init(); |
2638 | if (ret) | |
2639 | goto error_tp; | |
a90917c3 | 2640 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2641 | if (!event_cache) { |
2642 | ret = -ENOMEM; | |
2643 | goto error_kmem; | |
2644 | } | |
80996790 | 2645 | ret = lttng_abi_init(); |
02119ee5 MD |
2646 | if (ret) |
2647 | goto error_abi; | |
0c956676 MD |
2648 | ret = lttng_logger_init(); |
2649 | if (ret) | |
2650 | goto error_logger; | |
4e3c1b9b | 2651 | return 0; |
0c956676 MD |
2652 | |
2653 | error_logger: | |
2654 | lttng_abi_exit(); | |
02119ee5 | 2655 | error_abi: |
1c25284c | 2656 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2657 | error_kmem: |
2658 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2659 | error_tp: |
2660 | lttng_context_exit(); | |
1c25284c | 2661 | return ret; |
4e3c1b9b MD |
2662 | } |
2663 | ||
a90917c3 | 2664 | module_init(lttng_events_init); |
11b5a3c2 | 2665 | |
a90917c3 | 2666 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2667 | { |
a90917c3 | 2668 | struct lttng_session *session, *tmpsession; |
92e94819 | 2669 | |
0c956676 | 2670 | lttng_logger_exit(); |
80996790 | 2671 | lttng_abi_exit(); |
92e94819 | 2672 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2673 | lttng_session_destroy(session); |
11b5a3c2 | 2674 | kmem_cache_destroy(event_cache); |
20591cf7 | 2675 | lttng_tracepoint_exit(); |
07dfc1d0 | 2676 | lttng_context_exit(); |
4e3c1b9b | 2677 | } |
92e94819 | 2678 | |
a90917c3 | 2679 | module_exit(lttng_events_exit); |
11b5a3c2 | 2680 | |
92e94819 MD |
2681 | MODULE_LICENSE("GPL and additional rights"); |
2682 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2683 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2684 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2685 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2686 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2687 | LTTNG_MODULES_EXTRAVERSION); |