Commit | Line | Data |
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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 | ||
23 | #include <linux/module.h> | |
c0e31d2e MD |
24 | #include <linux/list.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/sched.h> | |
11b5a3c2 | 27 | #include <linux/slab.h> |
c099397a | 28 | #include <linux/jiffies.h> |
99dc9597 | 29 | #include <linux/utsname.h> |
abc0446a | 30 | #include <linux/err.h> |
7e6f9ef6 MD |
31 | #include <linux/seq_file.h> |
32 | #include <linux/file.h> | |
33 | #include <linux/anon_inodes.h> | |
34 | #include "wrapper/file.h" | |
a864fb02 | 35 | #include "wrapper/uuid.h" |
b13f3ebe | 36 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
a82c63f1 | 37 | #include "wrapper/random.h" |
3a523f5b | 38 | #include "wrapper/tracepoint.h" |
b8590f40 | 39 | #include "lttng-kernel-version.h" |
a90917c3 MD |
40 | #include "lttng-events.h" |
41 | #include "lttng-tracer.h" | |
6dccd6c1 | 42 | #include "lttng-abi-old.h" |
4e3c1b9b | 43 | |
d83004aa JD |
44 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
45 | ||
4e3c1b9b | 46 | static LIST_HEAD(sessions); |
a90917c3 | 47 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
48 | /* |
49 | * Protect the sessions and metadata caches. | |
50 | */ | |
4e3c1b9b MD |
51 | static DEFINE_MUTEX(sessions_mutex); |
52 | static struct kmem_cache *event_cache; | |
53 | ||
a90917c3 MD |
54 | static void _lttng_event_destroy(struct lttng_event *event); |
55 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
56 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 57 | static |
a90917c3 MD |
58 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
59 | struct lttng_channel *chan, | |
60 | struct lttng_event *event); | |
c099397a | 61 | static |
a90917c3 | 62 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
63 | static |
64 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 65 | |
c099397a | 66 | void synchronize_trace(void) |
abcca994 MD |
67 | { |
68 | synchronize_sched(); | |
b8590f40 MD |
69 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
70 | #ifdef CONFIG_PREEMPT_RT_FULL | |
71 | synchronize_rcu(); | |
72 | #endif | |
73 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
74 | #ifdef CONFIG_PREEMPT_RT |
75 | synchronize_rcu(); | |
76 | #endif | |
b8590f40 | 77 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
78 | } |
79 | ||
a90917c3 | 80 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 81 | { |
a90917c3 | 82 | struct lttng_session *session; |
d83004aa | 83 | struct lttng_metadata_cache *metadata_cache; |
4e3c1b9b MD |
84 | |
85 | mutex_lock(&sessions_mutex); | |
a90917c3 | 86 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 87 | if (!session) |
d83004aa | 88 | goto err; |
4e3c1b9b | 89 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 90 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 91 | uuid_le_gen(&session->uuid); |
d83004aa JD |
92 | |
93 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
94 | GFP_KERNEL); | |
95 | if (!metadata_cache) | |
96 | goto err_free_session; | |
97 | metadata_cache->data = kzalloc(METADATA_CACHE_DEFAULT_SIZE, | |
98 | GFP_KERNEL); | |
99 | if (!metadata_cache->data) | |
100 | goto err_free_cache; | |
101 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
102 | kref_init(&metadata_cache->refcount); | |
103 | session->metadata_cache = metadata_cache; | |
104 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
105 | memcpy(&metadata_cache->uuid, &session->uuid, |
106 | sizeof(metadata_cache->uuid)); | |
4e3c1b9b MD |
107 | list_add(&session->list, &sessions); |
108 | mutex_unlock(&sessions_mutex); | |
109 | return session; | |
d83004aa JD |
110 | |
111 | err_free_cache: | |
112 | kfree(metadata_cache); | |
113 | err_free_session: | |
114 | kfree(session); | |
115 | err: | |
116 | mutex_unlock(&sessions_mutex); | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | void metadata_cache_destroy(struct kref *kref) | |
121 | { | |
122 | struct lttng_metadata_cache *cache = | |
123 | container_of(kref, struct lttng_metadata_cache, refcount); | |
124 | kfree(cache->data); | |
125 | kfree(cache); | |
4e3c1b9b MD |
126 | } |
127 | ||
a90917c3 | 128 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 129 | { |
a90917c3 MD |
130 | struct lttng_channel *chan, *tmpchan; |
131 | struct lttng_event *event, *tmpevent; | |
d83004aa | 132 | struct lttng_metadata_stream *metadata_stream; |
dda6a249 | 133 | int ret; |
4e3c1b9b MD |
134 | |
135 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 136 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
137 | list_for_each_entry(chan, &session->chan, list) { |
138 | ret = lttng_syscalls_unregister(chan); | |
139 | WARN_ON(ret); | |
140 | } | |
dda6a249 | 141 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 142 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
143 | WARN_ON(ret); |
144 | } | |
abcca994 | 145 | synchronize_trace(); /* Wait for in-flight events to complete */ |
4e3c1b9b | 146 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 147 | _lttng_event_destroy(event); |
d83004aa JD |
148 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
149 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 150 | _lttng_channel_destroy(chan); |
d83004aa JD |
151 | } |
152 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
153 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
154 | if (session->pid_tracker) |
155 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 156 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
157 | list_del(&session->list); |
158 | mutex_unlock(&sessions_mutex); | |
159 | kfree(session); | |
160 | } | |
161 | ||
a90917c3 | 162 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
163 | { |
164 | int ret = 0; | |
a90917c3 | 165 | struct lttng_channel *chan; |
c0e31d2e MD |
166 | |
167 | mutex_lock(&sessions_mutex); | |
168 | if (session->active) { | |
169 | ret = -EBUSY; | |
170 | goto end; | |
171 | } | |
c099397a MD |
172 | |
173 | /* | |
174 | * Snapshot the number of events per channel to know the type of header | |
175 | * we need to use. | |
176 | */ | |
177 | list_for_each_entry(chan, &session->chan, list) { | |
178 | if (chan->header_type) | |
179 | continue; /* don't change it if session stop/restart */ | |
180 | if (chan->free_event_id < 31) | |
181 | chan->header_type = 1; /* compact */ | |
182 | else | |
183 | chan->header_type = 2; /* large */ | |
184 | } | |
185 | ||
52fc2e1f | 186 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 187 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 188 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
189 | if (ret) { |
190 | ACCESS_ONCE(session->active) = 0; | |
191 | goto end; | |
192 | } | |
193 | ret = lttng_statedump_start(session); | |
360f38ea | 194 | if (ret) |
c099397a | 195 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
196 | end: |
197 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 198 | return ret; |
c0e31d2e MD |
199 | } |
200 | ||
a90917c3 | 201 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
202 | { |
203 | int ret = 0; | |
204 | ||
205 | mutex_lock(&sessions_mutex); | |
206 | if (!session->active) { | |
207 | ret = -EBUSY; | |
208 | goto end; | |
209 | } | |
52fc2e1f | 210 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
211 | end: |
212 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 213 | return ret; |
c0e31d2e MD |
214 | } |
215 | ||
a90917c3 | 216 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da MD |
217 | { |
218 | int old; | |
219 | ||
d83004aa | 220 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 221 | return -EPERM; |
e64957da MD |
222 | old = xchg(&channel->enabled, 1); |
223 | if (old) | |
224 | return -EEXIST; | |
225 | return 0; | |
226 | } | |
227 | ||
a90917c3 | 228 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da MD |
229 | { |
230 | int old; | |
231 | ||
d83004aa | 232 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 233 | return -EPERM; |
e64957da MD |
234 | old = xchg(&channel->enabled, 0); |
235 | if (!old) | |
236 | return -EEXIST; | |
237 | return 0; | |
238 | } | |
239 | ||
a90917c3 | 240 | int lttng_event_enable(struct lttng_event *event) |
e64957da MD |
241 | { |
242 | int old; | |
243 | ||
d83004aa | 244 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 245 | return -EPERM; |
e64957da MD |
246 | old = xchg(&event->enabled, 1); |
247 | if (old) | |
248 | return -EEXIST; | |
249 | return 0; | |
250 | } | |
251 | ||
a90917c3 | 252 | int lttng_event_disable(struct lttng_event *event) |
e64957da MD |
253 | { |
254 | int old; | |
255 | ||
d83004aa | 256 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 257 | return -EPERM; |
e64957da MD |
258 | old = xchg(&event->enabled, 0); |
259 | if (!old) | |
260 | return -EEXIST; | |
261 | return 0; | |
262 | } | |
263 | ||
a90917c3 | 264 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 265 | { |
a90917c3 | 266 | struct lttng_transport *transport; |
f3d01b96 | 267 | |
a90917c3 | 268 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
269 | if (!strcmp(transport->name, name)) |
270 | return transport; | |
271 | } | |
272 | return NULL; | |
273 | } | |
274 | ||
a90917c3 | 275 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
276 | const char *transport_name, |
277 | void *buf_addr, | |
4e3c1b9b MD |
278 | size_t subbuf_size, size_t num_subbuf, |
279 | unsigned int switch_timer_interval, | |
d83004aa JD |
280 | unsigned int read_timer_interval, |
281 | enum channel_type channel_type) | |
4e3c1b9b | 282 | { |
a90917c3 MD |
283 | struct lttng_channel *chan; |
284 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
285 | |
286 | mutex_lock(&sessions_mutex); | |
d83004aa | 287 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 288 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 289 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
290 | if (!transport) { |
291 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
292 | transport_name); | |
c0e31d2e | 293 | goto notransport; |
f3d01b96 | 294 | } |
a33c9927 MD |
295 | if (!try_module_get(transport->owner)) { |
296 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
297 | goto notransport; | |
298 | } | |
a90917c3 | 299 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 300 | if (!chan) |
c0e31d2e | 301 | goto nomem; |
4e3c1b9b | 302 | chan->session = session; |
05d32c64 | 303 | chan->id = session->free_chan_id++; |
3b731ab1 | 304 | chan->ops = &transport->ops; |
125b4df4 MD |
305 | /* |
306 | * Note: the channel creation op already writes into the packet | |
307 | * headers. Therefore the "chan" information used as input | |
308 | * should be already accessible. | |
309 | */ | |
5f5ddf01 MD |
310 | chan->chan = transport->ops.channel_create(transport_name, |
311 | chan, buf_addr, subbuf_size, num_subbuf, | |
312 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
313 | if (!chan->chan) |
314 | goto create_error; | |
e64957da | 315 | chan->enabled = 1; |
a33c9927 | 316 | chan->transport = transport; |
d83004aa | 317 | chan->channel_type = channel_type; |
4e3c1b9b MD |
318 | list_add(&chan->list, &session->chan); |
319 | mutex_unlock(&sessions_mutex); | |
320 | return chan; | |
321 | ||
f3d01b96 MD |
322 | create_error: |
323 | kfree(chan); | |
c0e31d2e | 324 | nomem: |
a33c9927 MD |
325 | if (transport) |
326 | module_put(transport->owner); | |
c0e31d2e | 327 | notransport: |
e5382b6d | 328 | active: |
4e3c1b9b MD |
329 | mutex_unlock(&sessions_mutex); |
330 | return NULL; | |
331 | } | |
332 | ||
333 | /* | |
d83004aa JD |
334 | * Only used internally at session destruction for per-cpu channels, and |
335 | * when metadata channel is released. | |
336 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 337 | */ |
aa7c23a9 | 338 | static |
a90917c3 | 339 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 340 | { |
11b5a3c2 | 341 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 342 | module_put(chan->transport->owner); |
4e3c1b9b | 343 | list_del(&chan->list); |
8070f5c0 | 344 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
345 | kfree(chan); |
346 | } | |
347 | ||
d83004aa JD |
348 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
349 | { | |
350 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
351 | ||
352 | /* Protect the metadata cache with the sessions_mutex. */ | |
353 | mutex_lock(&sessions_mutex); | |
354 | _lttng_channel_destroy(chan); | |
355 | mutex_unlock(&sessions_mutex); | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
358 | ||
359 | static | |
360 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
361 | { | |
362 | stream->finalized = 1; | |
363 | wake_up_interruptible(&stream->read_wait); | |
364 | } | |
365 | ||
e5382b6d MD |
366 | /* |
367 | * Supports event creation while tracing session is active. | |
368 | */ | |
a90917c3 | 369 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
d6d808f3 | 370 | struct lttng_kernel_event *event_param, |
259b6cb3 MD |
371 | void *filter, |
372 | const struct lttng_event_desc *internal_desc) | |
4e3c1b9b | 373 | { |
a90917c3 | 374 | struct lttng_event *event; |
3d084699 | 375 | int ret; |
4e3c1b9b MD |
376 | |
377 | mutex_lock(&sessions_mutex); | |
abc0446a | 378 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 379 | ret = -EMFILE; |
e5382b6d | 380 | goto full; |
abc0446a | 381 | } |
4e3c1b9b | 382 | /* |
dda6a249 MD |
383 | * This is O(n^2) (for each event, the loop is called at event |
384 | * creation). Might require a hash if we have lots of events. | |
4e3c1b9b | 385 | */ |
abc0446a MD |
386 | list_for_each_entry(event, &chan->session->events, list) { |
387 | if (!strcmp(event->desc->name, event_param->name)) { | |
f046a95d MD |
388 | /* |
389 | * Allow events with the same name to appear in | |
390 | * different channels. | |
391 | */ | |
392 | if (event->chan == chan) { | |
393 | ret = -EEXIST; | |
394 | goto exist; | |
395 | } | |
abc0446a MD |
396 | } |
397 | } | |
11b5a3c2 | 398 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 399 | if (!event) { |
4cf0bf51 | 400 | ret = -ENOMEM; |
4e3c1b9b | 401 | goto cache_error; |
abc0446a | 402 | } |
4e3c1b9b MD |
403 | event->chan = chan; |
404 | event->filter = filter; | |
e5382b6d | 405 | event->id = chan->free_event_id++; |
e64957da | 406 | event->enabled = 1; |
d6d808f3 | 407 | event->instrumentation = event_param->instrumentation; |
a90917c3 | 408 | /* Populate lttng_event structure before tracepoint registration. */ |
e5382b6d | 409 | smp_wmb(); |
d6d808f3 | 410 | switch (event_param->instrumentation) { |
ab2277d6 | 411 | case LTTNG_KERNEL_TRACEPOINT: |
a90917c3 | 412 | event->desc = lttng_event_get(event_param->name); |
abc0446a | 413 | if (!event->desc) { |
4cf0bf51 | 414 | ret = -ENOENT; |
d3dbe23c | 415 | goto register_error; |
abc0446a | 416 | } |
20591cf7 | 417 | ret = lttng_wrapper_tracepoint_probe_register(event->desc->kname, |
d3dbe23c MD |
418 | event->desc->probe_callback, |
419 | event); | |
abc0446a | 420 | if (ret) { |
4cf0bf51 | 421 | ret = -EINVAL; |
11b5a3c2 | 422 | goto register_error; |
abc0446a | 423 | } |
baf20995 | 424 | break; |
ab2277d6 | 425 | case LTTNG_KERNEL_KPROBE: |
30bdb6e4 | 426 | ret = lttng_kprobes_register(event_param->name, |
f17701fb MD |
427 | event_param->u.kprobe.symbol_name, |
428 | event_param->u.kprobe.offset, | |
429 | event_param->u.kprobe.addr, | |
430 | event); | |
abc0446a | 431 | if (ret) { |
4cf0bf51 | 432 | ret = -EINVAL; |
d6d808f3 | 433 | goto register_error; |
abc0446a | 434 | } |
edeb3137 MD |
435 | ret = try_module_get(event->desc->owner); |
436 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 437 | break; |
7371f44c MD |
438 | case LTTNG_KERNEL_KRETPROBE: |
439 | { | |
a90917c3 | 440 | struct lttng_event *event_return; |
7371f44c MD |
441 | |
442 | /* kretprobe defines 2 events */ | |
443 | event_return = | |
444 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 445 | if (!event_return) { |
4cf0bf51 | 446 | ret = -ENOMEM; |
7371f44c | 447 | goto register_error; |
abc0446a | 448 | } |
7371f44c MD |
449 | event_return->chan = chan; |
450 | event_return->filter = filter; | |
451 | event_return->id = chan->free_event_id++; | |
452 | event_return->enabled = 1; | |
453 | event_return->instrumentation = event_param->instrumentation; | |
454 | /* | |
a90917c3 | 455 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
456 | */ |
457 | smp_wmb(); | |
458 | ret = lttng_kretprobes_register(event_param->name, | |
459 | event_param->u.kretprobe.symbol_name, | |
460 | event_param->u.kretprobe.offset, | |
461 | event_param->u.kretprobe.addr, | |
462 | event, event_return); | |
463 | if (ret) { | |
464 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 465 | ret = -EINVAL; |
7371f44c MD |
466 | goto register_error; |
467 | } | |
468 | /* Take 2 refs on the module: one per event. */ | |
469 | ret = try_module_get(event->desc->owner); | |
470 | WARN_ON_ONCE(!ret); | |
471 | ret = try_module_get(event->desc->owner); | |
472 | WARN_ON_ONCE(!ret); | |
a90917c3 | 473 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 474 | event_return); |
abc0446a | 475 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
476 | if (ret) { |
477 | kmem_cache_free(event_cache, event_return); | |
478 | module_put(event->desc->owner); | |
479 | module_put(event->desc->owner); | |
480 | goto statedump_error; | |
481 | } | |
482 | list_add(&event_return->list, &chan->session->events); | |
483 | break; | |
484 | } | |
ab2277d6 | 485 | case LTTNG_KERNEL_FUNCTION: |
30bdb6e4 | 486 | ret = lttng_ftrace_register(event_param->name, |
e0a7a7c4 MD |
487 | event_param->u.ftrace.symbol_name, |
488 | event); | |
abc0446a | 489 | if (ret) { |
e0a7a7c4 | 490 | goto register_error; |
abc0446a | 491 | } |
edeb3137 MD |
492 | ret = try_module_get(event->desc->owner); |
493 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 494 | break; |
1ec65de1 | 495 | case LTTNG_KERNEL_NOOP: |
259b6cb3 | 496 | event->desc = internal_desc; |
abc0446a | 497 | if (!event->desc) { |
4cf0bf51 | 498 | ret = -EINVAL; |
259b6cb3 | 499 | goto register_error; |
abc0446a | 500 | } |
1ec65de1 | 501 | break; |
baf20995 MD |
502 | default: |
503 | WARN_ON_ONCE(1); | |
4cf0bf51 | 504 | ret = -EINVAL; |
df07930b | 505 | goto register_error; |
baf20995 | 506 | } |
a90917c3 | 507 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
508 | WARN_ON_ONCE(ret > 0); |
509 | if (ret) { | |
c099397a | 510 | goto statedump_error; |
abc0446a | 511 | } |
dda6a249 | 512 | list_add(&event->list, &chan->session->events); |
11b5a3c2 | 513 | mutex_unlock(&sessions_mutex); |
4e3c1b9b MD |
514 | return event; |
515 | ||
c099397a | 516 | statedump_error: |
259b6cb3 | 517 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 518 | register_error: |
11b5a3c2 | 519 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
520 | cache_error: |
521 | exist: | |
e5382b6d | 522 | full: |
4e3c1b9b | 523 | mutex_unlock(&sessions_mutex); |
4cf0bf51 | 524 | return ERR_PTR(ret); |
4e3c1b9b MD |
525 | } |
526 | ||
527 | /* | |
528 | * Only used internally at session destruction. | |
529 | */ | |
a90917c3 | 530 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 531 | { |
11b5a3c2 MD |
532 | int ret = -EINVAL; |
533 | ||
38d024ae | 534 | switch (event->instrumentation) { |
ab2277d6 | 535 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 536 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 537 | event->desc->probe_callback, |
11b5a3c2 MD |
538 | event); |
539 | if (ret) | |
540 | return ret; | |
baf20995 | 541 | break; |
ab2277d6 | 542 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 543 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
544 | ret = 0; |
545 | break; | |
7371f44c MD |
546 | case LTTNG_KERNEL_KRETPROBE: |
547 | lttng_kretprobes_unregister(event); | |
548 | ret = 0; | |
549 | break; | |
ab2277d6 | 550 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
551 | lttng_ftrace_unregister(event); |
552 | ret = 0; | |
553 | break; | |
259b6cb3 MD |
554 | case LTTNG_KERNEL_NOOP: |
555 | ret = 0; | |
556 | break; | |
baf20995 MD |
557 | default: |
558 | WARN_ON_ONCE(1); | |
559 | } | |
dda6a249 MD |
560 | return ret; |
561 | } | |
562 | ||
563 | /* | |
564 | * Only used internally at session destruction. | |
565 | */ | |
be066e6c | 566 | static |
a90917c3 | 567 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 568 | { |
edeb3137 MD |
569 | switch (event->instrumentation) { |
570 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 571 | lttng_event_put(event->desc); |
edeb3137 MD |
572 | break; |
573 | case LTTNG_KERNEL_KPROBE: | |
574 | module_put(event->desc->owner); | |
575 | lttng_kprobes_destroy_private(event); | |
576 | break; | |
7371f44c MD |
577 | case LTTNG_KERNEL_KRETPROBE: |
578 | module_put(event->desc->owner); | |
579 | lttng_kretprobes_destroy_private(event); | |
580 | break; | |
edeb3137 MD |
581 | case LTTNG_KERNEL_FUNCTION: |
582 | module_put(event->desc->owner); | |
583 | lttng_ftrace_destroy_private(event); | |
584 | break; | |
259b6cb3 MD |
585 | case LTTNG_KERNEL_NOOP: |
586 | break; | |
edeb3137 MD |
587 | default: |
588 | WARN_ON_ONCE(1); | |
589 | } | |
dda6a249 | 590 | list_del(&event->list); |
8070f5c0 | 591 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 592 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
593 | } |
594 | ||
e0130fab MD |
595 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
596 | { | |
597 | int ret; | |
598 | ||
599 | if (pid < -1) | |
600 | return -EINVAL; | |
601 | mutex_lock(&sessions_mutex); | |
602 | if (pid == -1) { | |
603 | /* track all pids: destroy tracker. */ | |
604 | if (session->pid_tracker) { | |
605 | struct lttng_pid_tracker *lpf; | |
606 | ||
607 | lpf = session->pid_tracker; | |
608 | rcu_assign_pointer(session->pid_tracker, NULL); | |
609 | synchronize_trace(); | |
610 | lttng_pid_tracker_destroy(lpf); | |
611 | } | |
612 | ret = 0; | |
613 | } else { | |
614 | if (!session->pid_tracker) { | |
615 | struct lttng_pid_tracker *lpf; | |
616 | ||
617 | lpf = lttng_pid_tracker_create(); | |
618 | if (!lpf) { | |
619 | ret = -ENOMEM; | |
620 | goto unlock; | |
621 | } | |
622 | ret = lttng_pid_tracker_add(lpf, pid); | |
623 | rcu_assign_pointer(session->pid_tracker, lpf); | |
624 | } else { | |
625 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
626 | } | |
627 | } | |
628 | unlock: | |
629 | mutex_unlock(&sessions_mutex); | |
630 | return ret; | |
631 | } | |
632 | ||
633 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
634 | { | |
635 | int ret; | |
636 | ||
637 | if (pid < -1) | |
638 | return -EINVAL; | |
639 | mutex_lock(&sessions_mutex); | |
640 | if (pid == -1) { | |
641 | /* untrack all pids: replace by empty tracker. */ | |
642 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
643 | struct lttng_pid_tracker *lpf; | |
644 | ||
645 | lpf = lttng_pid_tracker_create(); | |
646 | if (!lpf) { | |
647 | ret = -ENOMEM; | |
648 | goto unlock; | |
649 | } | |
650 | rcu_assign_pointer(session->pid_tracker, lpf); | |
651 | synchronize_trace(); | |
652 | if (old_lpf) | |
653 | lttng_pid_tracker_destroy(old_lpf); | |
654 | ret = 0; | |
655 | } else { | |
656 | if (!session->pid_tracker) { | |
657 | ret = -ENOENT; | |
658 | goto unlock; | |
659 | } | |
660 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
661 | } | |
662 | unlock: | |
663 | mutex_unlock(&sessions_mutex); | |
664 | return ret; | |
665 | } | |
666 | ||
7e6f9ef6 MD |
667 | static |
668 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
669 | { | |
670 | struct lttng_session *session = m->private; | |
671 | struct lttng_pid_tracker *lpf; | |
672 | struct lttng_pid_hash_node *e; | |
673 | int iter = 0, i; | |
674 | ||
675 | mutex_lock(&sessions_mutex); | |
676 | lpf = session->pid_tracker; | |
677 | if (lpf) { | |
678 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
679 | struct hlist_head *head = &lpf->pid_hash[i]; | |
680 | ||
681 | hlist_for_each_entry(e, head, hlist) { | |
682 | if (iter++ >= *pos) | |
683 | return e; | |
684 | } | |
685 | } | |
686 | } else { | |
687 | /* PID tracker disabled. */ | |
688 | if (iter >= *pos && iter == 0) { | |
689 | return session; /* empty tracker */ | |
690 | } | |
691 | iter++; | |
692 | } | |
693 | /* End of list */ | |
694 | return NULL; | |
695 | } | |
696 | ||
697 | /* Called with sessions_mutex held. */ | |
698 | static | |
699 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
700 | { | |
701 | struct lttng_session *session = m->private; | |
702 | struct lttng_pid_tracker *lpf; | |
703 | struct lttng_pid_hash_node *e; | |
704 | int iter = 0, i; | |
705 | ||
706 | (*ppos)++; | |
707 | lpf = session->pid_tracker; | |
708 | if (lpf) { | |
709 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
710 | struct hlist_head *head = &lpf->pid_hash[i]; | |
711 | ||
712 | hlist_for_each_entry(e, head, hlist) { | |
713 | if (iter++ >= *ppos) | |
714 | return e; | |
715 | } | |
716 | } | |
717 | } else { | |
718 | /* PID tracker disabled. */ | |
719 | if (iter >= *ppos && iter == 0) | |
720 | return session; /* empty tracker */ | |
721 | iter++; | |
722 | } | |
723 | ||
724 | /* End of list */ | |
725 | return NULL; | |
726 | } | |
727 | ||
728 | static | |
729 | void pid_list_stop(struct seq_file *m, void *p) | |
730 | { | |
731 | mutex_unlock(&sessions_mutex); | |
732 | } | |
733 | ||
734 | static | |
735 | int pid_list_show(struct seq_file *m, void *p) | |
736 | { | |
737 | int pid; | |
738 | ||
739 | if (p == m->private) { | |
740 | /* Tracker disabled. */ | |
741 | pid = -1; | |
742 | } else { | |
743 | const struct lttng_pid_hash_node *e = p; | |
744 | ||
745 | pid = lttng_pid_tracker_get_node_pid(e); | |
746 | } | |
747 | seq_printf(m, "process { pid = %d; };\n", pid); | |
748 | return 0; | |
749 | } | |
750 | ||
751 | static | |
752 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
753 | .start = pid_list_start, | |
754 | .next = pid_list_next, | |
755 | .stop = pid_list_stop, | |
756 | .show = pid_list_show, | |
757 | }; | |
758 | ||
759 | static | |
760 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
761 | { | |
762 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
763 | } | |
764 | ||
765 | static | |
766 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
767 | { | |
768 | struct seq_file *m = file->private_data; | |
769 | struct lttng_session *session = m->private; | |
770 | int ret; | |
771 | ||
772 | WARN_ON_ONCE(!session); | |
773 | ret = seq_release(inode, file); | |
774 | if (!ret && session) | |
775 | fput(session->file); | |
776 | return ret; | |
777 | } | |
778 | ||
779 | const struct file_operations lttng_tracker_pids_list_fops = { | |
780 | .owner = THIS_MODULE, | |
781 | .open = lttng_tracker_pids_list_open, | |
782 | .read = seq_read, | |
783 | .llseek = seq_lseek, | |
784 | .release = lttng_tracker_pids_list_release, | |
785 | }; | |
786 | ||
787 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
788 | { | |
789 | struct file *tracker_pids_list_file; | |
790 | struct seq_file *m; | |
791 | int file_fd, ret; | |
792 | ||
793 | file_fd = lttng_get_unused_fd(); | |
794 | if (file_fd < 0) { | |
795 | ret = file_fd; | |
796 | goto fd_error; | |
797 | } | |
798 | ||
799 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
800 | <tng_tracker_pids_list_fops, | |
801 | NULL, O_RDWR); | |
802 | if (IS_ERR(tracker_pids_list_file)) { | |
803 | ret = PTR_ERR(tracker_pids_list_file); | |
804 | goto file_error; | |
805 | } | |
806 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); | |
807 | if (ret < 0) | |
808 | goto open_error; | |
809 | m = tracker_pids_list_file->private_data; | |
810 | m->private = session; | |
811 | fd_install(file_fd, tracker_pids_list_file); | |
812 | atomic_long_inc(&session->file->f_count); | |
813 | ||
814 | return file_fd; | |
815 | ||
816 | open_error: | |
817 | fput(tracker_pids_list_file); | |
818 | file_error: | |
819 | put_unused_fd(file_fd); | |
820 | fd_error: | |
821 | return ret; | |
822 | } | |
823 | ||
1ec3f75a | 824 | /* |
d83004aa JD |
825 | * Serialize at most one packet worth of metadata into a metadata |
826 | * channel. | |
1ec3f75a MD |
827 | * We have exclusive access to our metadata buffer (protected by the |
828 | * sessions_mutex), so we can do racy operations such as looking for | |
829 | * remaining space left in packet and write, since mutual exclusion | |
830 | * protects us from concurrent writes. | |
35097f36 JD |
831 | * Returns the number of bytes written in the channel, 0 if no data |
832 | * was written and a negative value on error. | |
1ec3f75a | 833 | */ |
b3b8072b MD |
834 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
835 | struct channel *chan) | |
d83004aa JD |
836 | { |
837 | struct lib_ring_buffer_ctx ctx; | |
838 | int ret = 0; | |
839 | size_t len, reserve_len; | |
840 | ||
f613e3e6 MD |
841 | /* |
842 | * Ensure we support mutiple get_next / put sequences followed | |
de23d59d MD |
843 | * by put_next. The metadata stream lock internally protects |
844 | * reading the metadata cache. It can indeed be read | |
845 | * concurrently by "get_next_subbuf" and "flush" operations on | |
846 | * the buffer invoked by different processes. | |
f613e3e6 | 847 | */ |
de23d59d | 848 | mutex_lock(&stream->lock); |
f613e3e6 MD |
849 | WARN_ON(stream->metadata_in < stream->metadata_out); |
850 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 851 | goto end; |
f613e3e6 | 852 | |
d83004aa | 853 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 854 | stream->metadata_in; |
9de2c215 | 855 | if (!len) |
de23d59d | 856 | goto end; |
d83004aa | 857 | reserve_len = min_t(size_t, |
b3b8072b | 858 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 859 | len); |
b3b8072b | 860 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
861 | sizeof(char), -1); |
862 | /* | |
863 | * If reservation failed, return an error to the caller. | |
864 | */ | |
b3b8072b | 865 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
866 | if (ret != 0) { |
867 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
868 | goto end; | |
869 | } | |
b3b8072b | 870 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 871 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 872 | reserve_len); |
b3b8072b | 873 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 874 | stream->metadata_in += reserve_len; |
d83004aa JD |
875 | ret = reserve_len; |
876 | ||
877 | end: | |
de23d59d | 878 | mutex_unlock(&stream->lock); |
d83004aa JD |
879 | return ret; |
880 | } | |
881 | ||
882 | /* | |
883 | * Write the metadata to the metadata cache. | |
884 | * Must be called with sessions_mutex held. | |
885 | */ | |
a90917c3 | 886 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
887 | const char *fmt, ...) |
888 | { | |
c099397a | 889 | char *str; |
d83004aa | 890 | size_t len; |
c099397a | 891 | va_list ap; |
d83004aa | 892 | struct lttng_metadata_stream *stream; |
c099397a MD |
893 | |
894 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
895 | ||
896 | va_start(ap, fmt); | |
897 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
898 | va_end(ap); | |
899 | if (!str) | |
900 | return -ENOMEM; | |
901 | ||
1ec3f75a | 902 | len = strlen(str); |
d83004aa JD |
903 | if (session->metadata_cache->metadata_written + len > |
904 | session->metadata_cache->cache_alloc) { | |
905 | char *tmp_cache_realloc; | |
906 | unsigned int tmp_cache_alloc_size; | |
907 | ||
908 | tmp_cache_alloc_size = max_t(unsigned int, | |
909 | session->metadata_cache->cache_alloc + len, | |
910 | session->metadata_cache->cache_alloc << 1); | |
911 | tmp_cache_realloc = krealloc(session->metadata_cache->data, | |
912 | tmp_cache_alloc_size, GFP_KERNEL); | |
913 | if (!tmp_cache_realloc) | |
914 | goto err; | |
915 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; | |
916 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 917 | } |
d83004aa JD |
918 | memcpy(session->metadata_cache->data + |
919 | session->metadata_cache->metadata_written, | |
920 | str, len); | |
921 | session->metadata_cache->metadata_written += len; | |
c099397a | 922 | kfree(str); |
d83004aa JD |
923 | |
924 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
925 | wake_up_interruptible(&stream->read_wait); | |
926 | ||
927 | return 0; | |
928 | ||
929 | err: | |
930 | kfree(str); | |
931 | return -ENOMEM; | |
c099397a MD |
932 | } |
933 | ||
d83004aa JD |
934 | /* |
935 | * Must be called with sessions_mutex held. | |
936 | */ | |
c099397a | 937 | static |
a90917c3 | 938 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 939 | const struct lttng_event_field *field) |
c099397a | 940 | { |
c099397a | 941 | int ret = 0; |
c099397a | 942 | |
8070f5c0 MD |
943 | switch (field->type.atype) { |
944 | case atype_integer: | |
945 | ret = lttng_metadata_printf(session, | |
244465ab | 946 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
947 | field->type.u.basic.integer.size, |
948 | field->type.u.basic.integer.alignment, | |
949 | field->type.u.basic.integer.signedness, | |
950 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
951 | ? "none" | |
952 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
953 | ? "UTF8" | |
954 | : "ASCII", | |
955 | field->type.u.basic.integer.base, | |
c099397a | 956 | #ifdef __BIG_ENDIAN |
8070f5c0 | 957 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 958 | #else |
8070f5c0 | 959 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 960 | #endif |
8070f5c0 MD |
961 | field->name); |
962 | break; | |
963 | case atype_enum: | |
964 | ret = lttng_metadata_printf(session, | |
244465ab | 965 | " %s _%s;\n", |
8070f5c0 MD |
966 | field->type.u.basic.enumeration.name, |
967 | field->name); | |
968 | break; | |
969 | case atype_array: | |
970 | { | |
971 | const struct lttng_basic_type *elem_type; | |
972 | ||
973 | elem_type = &field->type.u.array.elem_type; | |
974 | ret = lttng_metadata_printf(session, | |
244465ab | 975 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
976 | elem_type->u.basic.integer.size, |
977 | elem_type->u.basic.integer.alignment, | |
978 | elem_type->u.basic.integer.signedness, | |
979 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
980 | ? "none" | |
981 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
982 | ? "UTF8" | |
983 | : "ASCII", | |
984 | elem_type->u.basic.integer.base, | |
8fa75f34 | 985 | #ifdef __BIG_ENDIAN |
8070f5c0 | 986 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 987 | #else |
8070f5c0 | 988 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 989 | #endif |
8070f5c0 MD |
990 | field->name, field->type.u.array.length); |
991 | break; | |
992 | } | |
993 | case atype_sequence: | |
994 | { | |
995 | const struct lttng_basic_type *elem_type; | |
996 | const struct lttng_basic_type *length_type; | |
997 | ||
998 | elem_type = &field->type.u.sequence.elem_type; | |
999 | length_type = &field->type.u.sequence.length_type; | |
1000 | ret = lttng_metadata_printf(session, | |
1001 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1002 | length_type->u.basic.integer.size, |
32257272 | 1003 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1004 | length_type->u.basic.integer.signedness, |
1005 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1006 | ? "none" | |
0635cdd4 | 1007 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1008 | ? "UTF8" |
0635cdd4 | 1009 | : "ASCII"), |
8070f5c0 | 1010 | length_type->u.basic.integer.base, |
e0a7a7c4 | 1011 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1012 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1013 | #else |
0635cdd4 | 1014 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1015 | #endif |
27d2368e MD |
1016 | field->name); |
1017 | if (ret) | |
1018 | return ret; | |
1019 | ||
1020 | ret = lttng_metadata_printf(session, | |
244465ab | 1021 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1022 | elem_type->u.basic.integer.size, |
32257272 | 1023 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1024 | elem_type->u.basic.integer.signedness, |
1025 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1026 | ? "none" | |
0635cdd4 | 1027 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1028 | ? "UTF8" |
0635cdd4 | 1029 | : "ASCII"), |
8070f5c0 | 1030 | elem_type->u.basic.integer.base, |
8fa75f34 | 1031 | #ifdef __BIG_ENDIAN |
8070f5c0 | 1032 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1033 | #else |
8070f5c0 | 1034 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1035 | #endif |
8070f5c0 | 1036 | field->name, |
27d2368e | 1037 | field->name); |
8070f5c0 MD |
1038 | break; |
1039 | } | |
c099397a | 1040 | |
8070f5c0 MD |
1041 | case atype_string: |
1042 | /* Default encoding is UTF8 */ | |
1043 | ret = lttng_metadata_printf(session, | |
244465ab | 1044 | " string%s _%s;\n", |
8070f5c0 MD |
1045 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1046 | " { encoding = ASCII; }" : "", | |
1047 | field->name); | |
1048 | break; | |
1049 | default: | |
1050 | WARN_ON_ONCE(1); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | static | |
a90917c3 | 1057 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1058 | struct lttng_ctx *ctx) |
1059 | { | |
1060 | int ret = 0; | |
1061 | int i; | |
1062 | ||
1063 | if (!ctx) | |
1064 | return 0; | |
1065 | for (i = 0; i < ctx->nr_fields; i++) { | |
1066 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1067 | ||
a90917c3 | 1068 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1069 | if (ret) |
1070 | return ret; | |
1071 | } | |
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | static | |
a90917c3 MD |
1076 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1077 | struct lttng_event *event) | |
8070f5c0 MD |
1078 | { |
1079 | const struct lttng_event_desc *desc = event->desc; | |
1080 | int ret = 0; | |
1081 | int i; | |
1082 | ||
1083 | for (i = 0; i < desc->nr_fields; i++) { | |
1084 | const struct lttng_event_field *field = &desc->fields[i]; | |
1085 | ||
a90917c3 | 1086 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1087 | if (ret) |
1088 | return ret; | |
c099397a MD |
1089 | } |
1090 | return ret; | |
1091 | } | |
1092 | ||
d83004aa JD |
1093 | /* |
1094 | * Must be called with sessions_mutex held. | |
1095 | */ | |
c099397a | 1096 | static |
a90917c3 MD |
1097 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1098 | struct lttng_channel *chan, | |
1099 | struct lttng_event *event) | |
c099397a MD |
1100 | { |
1101 | int ret = 0; | |
1102 | ||
1103 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1104 | return 0; | |
d83004aa | 1105 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1106 | return 0; |
1107 | ||
1108 | ret = lttng_metadata_printf(session, | |
1109 | "event {\n" | |
ae734547 | 1110 | " name = \"%s\";\n" |
c099397a | 1111 | " id = %u;\n" |
b9074a1b | 1112 | " stream_id = %u;\n", |
c099397a MD |
1113 | event->desc->name, |
1114 | event->id, | |
1115 | event->chan->id); | |
1116 | if (ret) | |
1117 | goto end; | |
1118 | ||
b9074a1b MD |
1119 | if (event->ctx) { |
1120 | ret = lttng_metadata_printf(session, | |
1121 | " context := struct {\n"); | |
1122 | if (ret) | |
1123 | goto end; | |
1124 | } | |
a90917c3 | 1125 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1126 | if (ret) |
1127 | goto end; | |
b9074a1b MD |
1128 | if (event->ctx) { |
1129 | ret = lttng_metadata_printf(session, | |
1130 | " };\n"); | |
1131 | if (ret) | |
1132 | goto end; | |
1133 | } | |
8070f5c0 MD |
1134 | |
1135 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1136 | " fields := struct {\n" |
1137 | ); | |
1138 | if (ret) | |
1139 | goto end; | |
1140 | ||
a90917c3 | 1141 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1142 | if (ret) |
1143 | goto end; | |
1144 | ||
1145 | /* | |
1146 | * LTTng space reservation can only reserve multiples of the | |
1147 | * byte size. | |
1148 | */ | |
1149 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1150 | " };\n" |
1151 | "};\n\n"); | |
c099397a MD |
1152 | if (ret) |
1153 | goto end; | |
1154 | ||
c099397a MD |
1155 | event->metadata_dumped = 1; |
1156 | end: | |
1157 | return ret; | |
1158 | ||
1159 | } | |
1160 | ||
d83004aa JD |
1161 | /* |
1162 | * Must be called with sessions_mutex held. | |
1163 | */ | |
c099397a | 1164 | static |
a90917c3 MD |
1165 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1166 | struct lttng_channel *chan) | |
c099397a MD |
1167 | { |
1168 | int ret = 0; | |
1169 | ||
1170 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1171 | return 0; | |
d83004aa JD |
1172 | |
1173 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1174 | return 0; |
1175 | ||
1176 | WARN_ON_ONCE(!chan->header_type); | |
1177 | ret = lttng_metadata_printf(session, | |
1178 | "stream {\n" | |
1179 | " id = %u;\n" | |
9115fbdc | 1180 | " event.header := %s;\n" |
b9074a1b | 1181 | " packet.context := struct packet_context;\n", |
c099397a MD |
1182 | chan->id, |
1183 | chan->header_type == 1 ? "struct event_header_compact" : | |
1184 | "struct event_header_large"); | |
1185 | if (ret) | |
1186 | goto end; | |
1187 | ||
b9074a1b MD |
1188 | if (chan->ctx) { |
1189 | ret = lttng_metadata_printf(session, | |
1190 | " event.context := struct {\n"); | |
1191 | if (ret) | |
1192 | goto end; | |
1193 | } | |
a90917c3 | 1194 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1195 | if (ret) |
1196 | goto end; | |
b9074a1b MD |
1197 | if (chan->ctx) { |
1198 | ret = lttng_metadata_printf(session, | |
1199 | " };\n"); | |
1200 | if (ret) | |
1201 | goto end; | |
1202 | } | |
8070f5c0 MD |
1203 | |
1204 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1205 | "};\n\n"); |
8070f5c0 | 1206 | |
c099397a MD |
1207 | chan->metadata_dumped = 1; |
1208 | end: | |
1209 | return ret; | |
1210 | } | |
1211 | ||
d83004aa JD |
1212 | /* |
1213 | * Must be called with sessions_mutex held. | |
1214 | */ | |
9115fbdc | 1215 | static |
a90917c3 | 1216 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1217 | { |
1218 | return lttng_metadata_printf(session, | |
1219 | "struct packet_context {\n" | |
a3ccff4f MD |
1220 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1221 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1222 | " uint64_t content_size;\n" |
1223 | " uint64_t packet_size;\n" | |
a9afe705 | 1224 | " unsigned long events_discarded;\n" |
9115fbdc | 1225 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1226 | "};\n\n" |
9115fbdc MD |
1227 | ); |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Compact header: | |
1232 | * id: range: 0 - 30. | |
1233 | * id 31 is reserved to indicate an extended header. | |
1234 | * | |
1235 | * Large header: | |
1236 | * id: range: 0 - 65534. | |
1237 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1238 | * |
1239 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1240 | */ |
1241 | static | |
a90917c3 | 1242 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1243 | { |
1244 | return lttng_metadata_printf(session, | |
1245 | "struct event_header_compact {\n" | |
1246 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1247 | " variant <id> {\n" | |
1248 | " struct {\n" | |
a3ccff4f | 1249 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1250 | " } compact;\n" |
1251 | " struct {\n" | |
1252 | " uint32_t id;\n" | |
a3ccff4f | 1253 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1254 | " } extended;\n" |
1255 | " } v;\n" | |
1256 | "} align(%u);\n" | |
1257 | "\n" | |
1258 | "struct event_header_large {\n" | |
1259 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1260 | " variant <id> {\n" | |
1261 | " struct {\n" | |
a3ccff4f | 1262 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1263 | " } compact;\n" |
1264 | " struct {\n" | |
1265 | " uint32_t id;\n" | |
a3ccff4f | 1266 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1267 | " } extended;\n" |
1268 | " } v;\n" | |
1269 | "} align(%u);\n\n", | |
a90917c3 MD |
1270 | lttng_alignof(uint32_t) * CHAR_BIT, |
1271 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1272 | ); |
1273 | } | |
1274 | ||
a3ccff4f MD |
1275 | /* |
1276 | * Approximation of NTP time of day to clock monotonic correlation, | |
1277 | * taken at start of trace. | |
1278 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1279 | * in future versions. | |
1280 | */ | |
1281 | static | |
1282 | uint64_t measure_clock_offset(void) | |
1283 | { | |
1284 | uint64_t offset, monotonic[2], realtime; | |
1285 | struct timespec rts = { 0, 0 }; | |
1286 | unsigned long flags; | |
1287 | ||
1288 | /* Disable interrupts to increase correlation precision. */ | |
1289 | local_irq_save(flags); | |
1290 | monotonic[0] = trace_clock_read64(); | |
1291 | getnstimeofday(&rts); | |
1292 | monotonic[1] = trace_clock_read64(); | |
1293 | local_irq_restore(flags); | |
1294 | ||
1295 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
57be518d | 1296 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f MD |
1297 | realtime += rts.tv_nsec; |
1298 | offset = realtime - offset; | |
1299 | return offset; | |
1300 | } | |
1301 | ||
c099397a MD |
1302 | /* |
1303 | * Output metadata into this session's metadata buffers. | |
d83004aa | 1304 | * Must be called with sessions_mutex held. |
c099397a MD |
1305 | */ |
1306 | static | |
a90917c3 | 1307 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 1308 | { |
30bdb6e4 | 1309 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 1310 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
1311 | struct lttng_channel *chan; |
1312 | struct lttng_event *event; | |
c099397a MD |
1313 | int ret = 0; |
1314 | ||
1315 | if (!ACCESS_ONCE(session->active)) | |
1316 | return 0; | |
1317 | if (session->metadata_dumped) | |
1318 | goto skip_session; | |
c099397a | 1319 | |
d793d5e1 | 1320 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
1321 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
1322 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1323 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1324 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1325 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
1326 | |
1327 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1328 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
1329 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1330 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1331 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 1332 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
1333 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1334 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
1335 | "\n" |
1336 | "trace {\n" | |
1337 | " major = %u;\n" | |
1338 | " minor = %u;\n" | |
30bdb6e4 | 1339 | " uuid = \"%s\";\n" |
d793d5e1 MD |
1340 | " byte_order = %s;\n" |
1341 | " packet.header := struct {\n" | |
1342 | " uint32_t magic;\n" | |
1ec3f75a | 1343 | " uint8_t uuid[16];\n" |
d793d5e1 | 1344 | " uint32_t stream_id;\n" |
0eb25f58 | 1345 | " };\n" |
d793d5e1 | 1346 | "};\n\n", |
a90917c3 MD |
1347 | lttng_alignof(uint8_t) * CHAR_BIT, |
1348 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1349 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1350 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
1351 | sizeof(unsigned long) * CHAR_BIT, |
1352 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
1353 | CTF_SPEC_MAJOR, |
1354 | CTF_SPEC_MINOR, | |
d793d5e1 MD |
1355 | uuid_s, |
1356 | #ifdef __BIG_ENDIAN | |
1357 | "be" | |
1358 | #else | |
1359 | "le" | |
1360 | #endif | |
1361 | ); | |
1362 | if (ret) | |
1363 | goto end; | |
1364 | ||
99dc9597 MD |
1365 | ret = lttng_metadata_printf(session, |
1366 | "env {\n" | |
a6058143 | 1367 | " hostname = \"%s\";\n" |
c6c9e10f | 1368 | " domain = \"kernel\";\n" |
99dc9597 | 1369 | " sysname = \"%s\";\n" |
c6c9e10f MD |
1370 | " kernel_release = \"%s\";\n" |
1371 | " kernel_version = \"%s\";\n" | |
1372 | " tracer_name = \"lttng-modules\";\n" | |
1373 | " tracer_major = %d;\n" | |
1374 | " tracer_minor = %d;\n" | |
1375 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 1376 | "};\n\n", |
3d0d43db | 1377 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
1378 | utsname()->sysname, |
1379 | utsname()->release, | |
c6c9e10f MD |
1380 | utsname()->version, |
1381 | LTTNG_MODULES_MAJOR_VERSION, | |
1382 | LTTNG_MODULES_MINOR_VERSION, | |
1383 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
1384 | ); |
1385 | if (ret) | |
1386 | goto end; | |
1387 | ||
a3ccff4f MD |
1388 | ret = lttng_metadata_printf(session, |
1389 | "clock {\n" | |
a82c63f1 MD |
1390 | " name = %s;\n", |
1391 | "monotonic" | |
1392 | ); | |
1393 | if (ret) | |
1394 | goto end; | |
1395 | ||
1396 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1397 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 1398 | " uuid = \"%s\";\n", |
a82c63f1 MD |
1399 | clock_uuid_s |
1400 | ); | |
1401 | if (ret) | |
1402 | goto end; | |
1403 | } | |
1404 | ||
1405 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
1406 | " description = \"Monotonic Clock\";\n" |
1407 | " freq = %llu; /* Frequency, in Hz */\n" | |
1408 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1409 | " offset = %llu;\n" | |
1410 | "};\n\n", | |
a3ccff4f MD |
1411 | (unsigned long long) trace_clock_freq(), |
1412 | (unsigned long long) measure_clock_offset() | |
1413 | ); | |
1414 | if (ret) | |
1415 | goto end; | |
1416 | ||
1417 | ret = lttng_metadata_printf(session, | |
1418 | "typealias integer {\n" | |
1419 | " size = 27; align = 1; signed = false;\n" | |
1420 | " map = clock.monotonic.value;\n" | |
1421 | "} := uint27_clock_monotonic_t;\n" | |
1422 | "\n" | |
1423 | "typealias integer {\n" | |
1424 | " size = 32; align = %u; signed = false;\n" | |
1425 | " map = clock.monotonic.value;\n" | |
1426 | "} := uint32_clock_monotonic_t;\n" | |
1427 | "\n" | |
1428 | "typealias integer {\n" | |
1429 | " size = 64; align = %u; signed = false;\n" | |
1430 | " map = clock.monotonic.value;\n" | |
1431 | "} := uint64_clock_monotonic_t;\n\n", | |
1432 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1433 | lttng_alignof(uint64_t) * CHAR_BIT | |
1434 | ); | |
1435 | if (ret) | |
1436 | goto end; | |
1437 | ||
a90917c3 | 1438 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
1439 | if (ret) |
1440 | goto end; | |
1441 | ||
a90917c3 | 1442 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
1443 | if (ret) |
1444 | goto end; | |
1445 | ||
c099397a MD |
1446 | skip_session: |
1447 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 1448 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
1449 | if (ret) |
1450 | goto end; | |
1451 | } | |
1452 | ||
1453 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 1454 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
1455 | if (ret) |
1456 | goto end; | |
1457 | } | |
1458 | session->metadata_dumped = 1; | |
1459 | end: | |
1460 | return ret; | |
1461 | } | |
1462 | ||
c0e31d2e | 1463 | /** |
a90917c3 | 1464 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
1465 | * @transport: transport structure |
1466 | * | |
1467 | * Registers a transport which can be used as output to extract the data out of | |
1468 | * LTTng. The module calling this registration function must ensure that no | |
1469 | * trap-inducing code will be executed by the transport functions. E.g. | |
1470 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
1471 | * is made visible to the transport function. This registration acts as a | |
1472 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
1473 | * after its registration must it synchronize the TLBs. | |
1474 | */ | |
a90917c3 | 1475 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
1476 | { |
1477 | /* | |
1478 | * Make sure no page fault can be triggered by the module about to be | |
1479 | * registered. We deal with this here so we don't have to call | |
1480 | * vmalloc_sync_all() in each module's init. | |
1481 | */ | |
6d2a620c | 1482 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
1483 | |
1484 | mutex_lock(&sessions_mutex); | |
a90917c3 | 1485 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
1486 | mutex_unlock(&sessions_mutex); |
1487 | } | |
a90917c3 | 1488 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
1489 | |
1490 | /** | |
a90917c3 | 1491 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
1492 | * @transport: transport structure |
1493 | */ | |
a90917c3 | 1494 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
1495 | { |
1496 | mutex_lock(&sessions_mutex); | |
1497 | list_del(&transport->node); | |
1498 | mutex_unlock(&sessions_mutex); | |
1499 | } | |
a90917c3 | 1500 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 1501 | |
a90917c3 | 1502 | static int __init lttng_events_init(void) |
4e3c1b9b | 1503 | { |
1c25284c MD |
1504 | int ret; |
1505 | ||
453b2495 JD |
1506 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
1507 | if (ret) | |
1508 | return ret; | |
1509 | ||
20591cf7 MD |
1510 | ret = lttng_tracepoint_init(); |
1511 | if (ret) | |
1512 | return ret; | |
a90917c3 | 1513 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
1514 | if (!event_cache) { |
1515 | ret = -ENOMEM; | |
1516 | goto error_kmem; | |
1517 | } | |
80996790 | 1518 | ret = lttng_abi_init(); |
02119ee5 MD |
1519 | if (ret) |
1520 | goto error_abi; | |
0c956676 MD |
1521 | ret = lttng_logger_init(); |
1522 | if (ret) | |
1523 | goto error_logger; | |
4e3c1b9b | 1524 | return 0; |
0c956676 MD |
1525 | |
1526 | error_logger: | |
1527 | lttng_abi_exit(); | |
02119ee5 | 1528 | error_abi: |
1c25284c | 1529 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
1530 | error_kmem: |
1531 | lttng_tracepoint_exit(); | |
1c25284c | 1532 | return ret; |
4e3c1b9b MD |
1533 | } |
1534 | ||
a90917c3 | 1535 | module_init(lttng_events_init); |
11b5a3c2 | 1536 | |
a90917c3 | 1537 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 1538 | { |
a90917c3 | 1539 | struct lttng_session *session, *tmpsession; |
92e94819 | 1540 | |
0c956676 | 1541 | lttng_logger_exit(); |
80996790 | 1542 | lttng_abi_exit(); |
92e94819 | 1543 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 1544 | lttng_session_destroy(session); |
11b5a3c2 | 1545 | kmem_cache_destroy(event_cache); |
20591cf7 | 1546 | lttng_tracepoint_exit(); |
4e3c1b9b | 1547 | } |
92e94819 | 1548 | |
a90917c3 | 1549 | module_exit(lttng_events_exit); |
11b5a3c2 | 1550 | |
92e94819 MD |
1551 | MODULE_LICENSE("GPL and additional rights"); |
1552 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1553 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
1554 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
1555 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
1556 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
1557 | LTTNG_MODULES_EXTRAVERSION); |