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> | |
d669b02d | 53 | #include <lttng-endian.h> |
241ae9a8 | 54 | #include <wrapper/vzalloc.h> |
4e3c1b9b | 55 | |
d83004aa JD |
56 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
57 | ||
4e3c1b9b | 58 | static LIST_HEAD(sessions); |
a90917c3 | 59 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
60 | /* |
61 | * Protect the sessions and metadata caches. | |
62 | */ | |
4e3c1b9b MD |
63 | static DEFINE_MUTEX(sessions_mutex); |
64 | static struct kmem_cache *event_cache; | |
65 | ||
3c997079 MD |
66 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
67 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
68 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
69 | ||
a90917c3 MD |
70 | static void _lttng_event_destroy(struct lttng_event *event); |
71 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
72 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 73 | static |
a90917c3 MD |
74 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
75 | struct lttng_channel *chan, | |
76 | struct lttng_event *event); | |
c099397a | 77 | static |
a90917c3 | 78 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
79 | static |
80 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 81 | |
c099397a | 82 | void synchronize_trace(void) |
abcca994 MD |
83 | { |
84 | synchronize_sched(); | |
b8590f40 MD |
85 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
86 | #ifdef CONFIG_PREEMPT_RT_FULL | |
87 | synchronize_rcu(); | |
88 | #endif | |
89 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
90 | #ifdef CONFIG_PREEMPT_RT |
91 | synchronize_rcu(); | |
92 | #endif | |
b8590f40 | 93 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
94 | } |
95 | ||
3c997079 MD |
96 | void lttng_lock_sessions(void) |
97 | { | |
98 | mutex_lock(&sessions_mutex); | |
99 | } | |
100 | ||
101 | void lttng_unlock_sessions(void) | |
102 | { | |
103 | mutex_unlock(&sessions_mutex); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Called with sessions lock held. | |
108 | */ | |
109 | int lttng_session_active(void) | |
110 | { | |
111 | struct lttng_session *iter; | |
112 | ||
113 | list_for_each_entry(iter, &sessions, list) { | |
114 | if (iter->active) | |
115 | return 1; | |
116 | } | |
117 | return 0; | |
118 | } | |
119 | ||
a90917c3 | 120 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 121 | { |
a90917c3 | 122 | struct lttng_session *session; |
d83004aa | 123 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 124 | int i; |
4e3c1b9b MD |
125 | |
126 | mutex_lock(&sessions_mutex); | |
a90917c3 | 127 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 128 | if (!session) |
d83004aa | 129 | goto err; |
4e3c1b9b | 130 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 131 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 132 | uuid_le_gen(&session->uuid); |
d83004aa JD |
133 | |
134 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
135 | GFP_KERNEL); | |
136 | if (!metadata_cache) | |
137 | goto err_free_session; | |
f6da044f | 138 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
139 | if (!metadata_cache->data) |
140 | goto err_free_cache; | |
141 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
142 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 143 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
144 | session->metadata_cache = metadata_cache; |
145 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
146 | memcpy(&metadata_cache->uuid, &session->uuid, |
147 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
148 | INIT_LIST_HEAD(&session->enablers_head); |
149 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
150 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
151 | list_add(&session->list, &sessions); |
152 | mutex_unlock(&sessions_mutex); | |
153 | return session; | |
d83004aa JD |
154 | |
155 | err_free_cache: | |
156 | kfree(metadata_cache); | |
157 | err_free_session: | |
158 | kfree(session); | |
159 | err: | |
160 | mutex_unlock(&sessions_mutex); | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | void metadata_cache_destroy(struct kref *kref) | |
165 | { | |
166 | struct lttng_metadata_cache *cache = | |
167 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 168 | vfree(cache->data); |
d83004aa | 169 | kfree(cache); |
4e3c1b9b MD |
170 | } |
171 | ||
a90917c3 | 172 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 173 | { |
a90917c3 MD |
174 | struct lttng_channel *chan, *tmpchan; |
175 | struct lttng_event *event, *tmpevent; | |
d83004aa | 176 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 177 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 178 | int ret; |
4e3c1b9b MD |
179 | |
180 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 181 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
182 | list_for_each_entry(chan, &session->chan, list) { |
183 | ret = lttng_syscalls_unregister(chan); | |
184 | WARN_ON(ret); | |
185 | } | |
dda6a249 | 186 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 187 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
188 | WARN_ON(ret); |
189 | } | |
abcca994 | 190 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
191 | list_for_each_entry_safe(enabler, tmpenabler, |
192 | &session->enablers_head, node) | |
193 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 194 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 195 | _lttng_event_destroy(event); |
d83004aa JD |
196 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
197 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 198 | _lttng_channel_destroy(chan); |
d83004aa JD |
199 | } |
200 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
201 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
202 | if (session->pid_tracker) |
203 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 204 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
205 | list_del(&session->list); |
206 | mutex_unlock(&sessions_mutex); | |
207 | kfree(session); | |
208 | } | |
209 | ||
a90917c3 | 210 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
211 | { |
212 | int ret = 0; | |
a90917c3 | 213 | struct lttng_channel *chan; |
c0e31d2e MD |
214 | |
215 | mutex_lock(&sessions_mutex); | |
216 | if (session->active) { | |
217 | ret = -EBUSY; | |
218 | goto end; | |
219 | } | |
c099397a | 220 | |
3c997079 MD |
221 | /* Set transient enabler state to "enabled" */ |
222 | session->tstate = 1; | |
223 | ||
c099397a MD |
224 | /* |
225 | * Snapshot the number of events per channel to know the type of header | |
226 | * we need to use. | |
227 | */ | |
228 | list_for_each_entry(chan, &session->chan, list) { | |
229 | if (chan->header_type) | |
230 | continue; /* don't change it if session stop/restart */ | |
231 | if (chan->free_event_id < 31) | |
232 | chan->header_type = 1; /* compact */ | |
233 | else | |
234 | chan->header_type = 2; /* large */ | |
235 | } | |
236 | ||
3c997079 MD |
237 | /* We need to sync enablers with session before activation. */ |
238 | lttng_session_sync_enablers(session); | |
239 | ||
52fc2e1f | 240 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 241 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 242 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
243 | if (ret) { |
244 | ACCESS_ONCE(session->active) = 0; | |
245 | goto end; | |
246 | } | |
247 | ret = lttng_statedump_start(session); | |
360f38ea | 248 | if (ret) |
c099397a | 249 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
250 | end: |
251 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 252 | return ret; |
c0e31d2e MD |
253 | } |
254 | ||
a90917c3 | 255 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
256 | { |
257 | int ret = 0; | |
258 | ||
259 | mutex_lock(&sessions_mutex); | |
260 | if (!session->active) { | |
261 | ret = -EBUSY; | |
262 | goto end; | |
263 | } | |
52fc2e1f | 264 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
265 | |
266 | /* Set transient enabler state to "disabled" */ | |
267 | session->tstate = 0; | |
268 | lttng_session_sync_enablers(session); | |
c0e31d2e MD |
269 | end: |
270 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 271 | return ret; |
c0e31d2e MD |
272 | } |
273 | ||
9616f0bf JD |
274 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
275 | { | |
276 | int ret = 0; | |
277 | struct lttng_channel *chan; | |
278 | struct lttng_event *event; | |
279 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
280 | struct lttng_metadata_stream *stream; | |
281 | ||
282 | mutex_lock(&sessions_mutex); | |
283 | if (!session->active) { | |
284 | ret = -EBUSY; | |
285 | goto end; | |
286 | } | |
287 | ||
288 | mutex_lock(&cache->lock); | |
289 | memset(cache->data, 0, cache->cache_alloc); | |
290 | cache->metadata_written = 0; | |
291 | cache->version++; | |
292 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
293 | stream->metadata_out = 0; | |
294 | stream->metadata_in = 0; | |
295 | } | |
296 | mutex_unlock(&cache->lock); | |
297 | ||
298 | session->metadata_dumped = 0; | |
299 | list_for_each_entry(chan, &session->chan, list) { | |
300 | chan->metadata_dumped = 0; | |
301 | } | |
302 | ||
303 | list_for_each_entry(event, &session->events, list) { | |
304 | event->metadata_dumped = 0; | |
305 | } | |
306 | ||
307 | ret = _lttng_session_metadata_statedump(session); | |
308 | ||
309 | end: | |
310 | mutex_unlock(&sessions_mutex); | |
311 | return ret; | |
312 | } | |
313 | ||
314 | ||
315 | ||
a90917c3 | 316 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 317 | { |
3c997079 | 318 | int ret = 0; |
e64957da | 319 | |
3c997079 MD |
320 | mutex_lock(&sessions_mutex); |
321 | if (channel->channel_type == METADATA_CHANNEL) { | |
322 | ret = -EPERM; | |
323 | goto end; | |
324 | } | |
325 | if (channel->enabled) { | |
326 | ret = -EEXIST; | |
327 | goto end; | |
328 | } | |
329 | /* Set transient enabler state to "enabled" */ | |
330 | channel->tstate = 1; | |
331 | lttng_session_sync_enablers(channel->session); | |
332 | /* Set atomically the state to "enabled" */ | |
333 | ACCESS_ONCE(channel->enabled) = 1; | |
334 | end: | |
335 | mutex_unlock(&sessions_mutex); | |
336 | return ret; | |
e64957da MD |
337 | } |
338 | ||
a90917c3 | 339 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 340 | { |
3c997079 | 341 | int ret = 0; |
e64957da | 342 | |
3c997079 MD |
343 | mutex_lock(&sessions_mutex); |
344 | if (channel->channel_type == METADATA_CHANNEL) { | |
345 | ret = -EPERM; | |
346 | goto end; | |
347 | } | |
348 | if (!channel->enabled) { | |
349 | ret = -EEXIST; | |
350 | goto end; | |
351 | } | |
352 | /* Set atomically the state to "disabled" */ | |
353 | ACCESS_ONCE(channel->enabled) = 0; | |
354 | /* Set transient enabler state to "enabled" */ | |
355 | channel->tstate = 0; | |
356 | lttng_session_sync_enablers(channel->session); | |
357 | end: | |
358 | mutex_unlock(&sessions_mutex); | |
359 | return ret; | |
e64957da MD |
360 | } |
361 | ||
a90917c3 | 362 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 363 | { |
3c997079 | 364 | int ret = 0; |
e64957da | 365 | |
3c997079 MD |
366 | mutex_lock(&sessions_mutex); |
367 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
368 | ret = -EPERM; | |
369 | goto end; | |
370 | } | |
371 | if (event->enabled) { | |
372 | ret = -EEXIST; | |
373 | goto end; | |
374 | } | |
a0493bef MD |
375 | switch (event->instrumentation) { |
376 | case LTTNG_KERNEL_TRACEPOINT: | |
377 | case LTTNG_KERNEL_SYSCALL: | |
378 | ret = -EINVAL; | |
379 | break; | |
380 | case LTTNG_KERNEL_KPROBE: | |
381 | case LTTNG_KERNEL_FUNCTION: | |
382 | case LTTNG_KERNEL_NOOP: | |
383 | ACCESS_ONCE(event->enabled) = 1; | |
384 | break; | |
385 | case LTTNG_KERNEL_KRETPROBE: | |
386 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
387 | break; | |
388 | default: | |
389 | WARN_ON_ONCE(1); | |
390 | ret = -EINVAL; | |
391 | } | |
3c997079 MD |
392 | end: |
393 | mutex_unlock(&sessions_mutex); | |
394 | return ret; | |
e64957da MD |
395 | } |
396 | ||
a90917c3 | 397 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 398 | { |
3c997079 | 399 | int ret = 0; |
e64957da | 400 | |
3c997079 MD |
401 | mutex_lock(&sessions_mutex); |
402 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
403 | ret = -EPERM; | |
404 | goto end; | |
405 | } | |
406 | if (!event->enabled) { | |
407 | ret = -EEXIST; | |
408 | goto end; | |
409 | } | |
a0493bef MD |
410 | switch (event->instrumentation) { |
411 | case LTTNG_KERNEL_TRACEPOINT: | |
412 | case LTTNG_KERNEL_SYSCALL: | |
413 | ret = -EINVAL; | |
414 | break; | |
415 | case LTTNG_KERNEL_KPROBE: | |
416 | case LTTNG_KERNEL_FUNCTION: | |
417 | case LTTNG_KERNEL_NOOP: | |
418 | ACCESS_ONCE(event->enabled) = 0; | |
419 | break; | |
420 | case LTTNG_KERNEL_KRETPROBE: | |
421 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
422 | break; | |
423 | default: | |
424 | WARN_ON_ONCE(1); | |
425 | ret = -EINVAL; | |
426 | } | |
3c997079 MD |
427 | end: |
428 | mutex_unlock(&sessions_mutex); | |
429 | return ret; | |
e64957da MD |
430 | } |
431 | ||
a90917c3 | 432 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 433 | { |
a90917c3 | 434 | struct lttng_transport *transport; |
f3d01b96 | 435 | |
a90917c3 | 436 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
437 | if (!strcmp(transport->name, name)) |
438 | return transport; | |
439 | } | |
440 | return NULL; | |
441 | } | |
442 | ||
a90917c3 | 443 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
444 | const char *transport_name, |
445 | void *buf_addr, | |
4e3c1b9b MD |
446 | size_t subbuf_size, size_t num_subbuf, |
447 | unsigned int switch_timer_interval, | |
d83004aa JD |
448 | unsigned int read_timer_interval, |
449 | enum channel_type channel_type) | |
4e3c1b9b | 450 | { |
a90917c3 MD |
451 | struct lttng_channel *chan; |
452 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
453 | |
454 | mutex_lock(&sessions_mutex); | |
d83004aa | 455 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 456 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 457 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
458 | if (!transport) { |
459 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
460 | transport_name); | |
c0e31d2e | 461 | goto notransport; |
f3d01b96 | 462 | } |
a33c9927 MD |
463 | if (!try_module_get(transport->owner)) { |
464 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
465 | goto notransport; | |
466 | } | |
a90917c3 | 467 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 468 | if (!chan) |
c0e31d2e | 469 | goto nomem; |
4e3c1b9b | 470 | chan->session = session; |
05d32c64 | 471 | chan->id = session->free_chan_id++; |
3b731ab1 | 472 | chan->ops = &transport->ops; |
125b4df4 MD |
473 | /* |
474 | * Note: the channel creation op already writes into the packet | |
475 | * headers. Therefore the "chan" information used as input | |
476 | * should be already accessible. | |
477 | */ | |
5f5ddf01 MD |
478 | chan->chan = transport->ops.channel_create(transport_name, |
479 | chan, buf_addr, subbuf_size, num_subbuf, | |
480 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
481 | if (!chan->chan) |
482 | goto create_error; | |
3c997079 | 483 | chan->tstate = 1; |
e64957da | 484 | chan->enabled = 1; |
a33c9927 | 485 | chan->transport = transport; |
d83004aa | 486 | chan->channel_type = channel_type; |
4e3c1b9b MD |
487 | list_add(&chan->list, &session->chan); |
488 | mutex_unlock(&sessions_mutex); | |
489 | return chan; | |
490 | ||
f3d01b96 MD |
491 | create_error: |
492 | kfree(chan); | |
c0e31d2e | 493 | nomem: |
a33c9927 MD |
494 | if (transport) |
495 | module_put(transport->owner); | |
c0e31d2e | 496 | notransport: |
e5382b6d | 497 | active: |
4e3c1b9b MD |
498 | mutex_unlock(&sessions_mutex); |
499 | return NULL; | |
500 | } | |
501 | ||
502 | /* | |
d83004aa JD |
503 | * Only used internally at session destruction for per-cpu channels, and |
504 | * when metadata channel is released. | |
505 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 506 | */ |
aa7c23a9 | 507 | static |
a90917c3 | 508 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 509 | { |
11b5a3c2 | 510 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 511 | module_put(chan->transport->owner); |
4e3c1b9b | 512 | list_del(&chan->list); |
8070f5c0 | 513 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
514 | kfree(chan); |
515 | } | |
516 | ||
d83004aa JD |
517 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
518 | { | |
519 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
520 | ||
521 | /* Protect the metadata cache with the sessions_mutex. */ | |
522 | mutex_lock(&sessions_mutex); | |
523 | _lttng_channel_destroy(chan); | |
524 | mutex_unlock(&sessions_mutex); | |
525 | } | |
526 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
527 | ||
528 | static | |
529 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
530 | { | |
531 | stream->finalized = 1; | |
532 | wake_up_interruptible(&stream->read_wait); | |
533 | } | |
534 | ||
e5382b6d MD |
535 | /* |
536 | * Supports event creation while tracing session is active. | |
3c997079 | 537 | * Needs to be called with sessions mutex held. |
e5382b6d | 538 | */ |
3c997079 MD |
539 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
540 | struct lttng_kernel_event *event_param, | |
541 | void *filter, | |
542 | const struct lttng_event_desc *event_desc, | |
543 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 544 | { |
3c997079 | 545 | struct lttng_session *session = chan->session; |
a90917c3 | 546 | struct lttng_event *event; |
3c997079 MD |
547 | const char *event_name; |
548 | struct hlist_head *head; | |
549 | size_t name_len; | |
550 | uint32_t hash; | |
3d084699 | 551 | int ret; |
4e3c1b9b | 552 | |
abc0446a | 553 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 554 | ret = -EMFILE; |
e5382b6d | 555 | goto full; |
abc0446a | 556 | } |
3c997079 MD |
557 | |
558 | switch (itype) { | |
559 | case LTTNG_KERNEL_TRACEPOINT: | |
560 | event_name = event_desc->name; | |
561 | break; | |
562 | case LTTNG_KERNEL_KPROBE: | |
563 | case LTTNG_KERNEL_KRETPROBE: | |
564 | case LTTNG_KERNEL_FUNCTION: | |
565 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 566 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
567 | event_name = event_param->name; |
568 | break; | |
569 | default: | |
570 | WARN_ON_ONCE(1); | |
571 | ret = -EINVAL; | |
572 | goto type_error; | |
573 | } | |
574 | name_len = strlen(event_name); | |
575 | hash = jhash(event_name, name_len, 0); | |
576 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 577 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
578 | WARN_ON_ONCE(!event->desc); |
579 | if (!strncmp(event->desc->name, event_name, | |
580 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
581 | && chan == event->chan) { | |
582 | ret = -EEXIST; | |
583 | goto exist; | |
abc0446a MD |
584 | } |
585 | } | |
3c997079 | 586 | |
11b5a3c2 | 587 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 588 | if (!event) { |
4cf0bf51 | 589 | ret = -ENOMEM; |
4e3c1b9b | 590 | goto cache_error; |
abc0446a | 591 | } |
4e3c1b9b MD |
592 | event->chan = chan; |
593 | event->filter = filter; | |
e5382b6d | 594 | event->id = chan->free_event_id++; |
3c997079 MD |
595 | event->instrumentation = itype; |
596 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 597 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
598 | INIT_LIST_HEAD(&event->enablers_ref_head); |
599 | ||
600 | switch (itype) { | |
ab2277d6 | 601 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
602 | /* Event will be enabled by enabler sync. */ |
603 | event->enabled = 0; | |
604 | event->registered = 0; | |
605 | event->desc = lttng_event_get(event_name); | |
abc0446a | 606 | if (!event->desc) { |
4cf0bf51 | 607 | ret = -ENOENT; |
d3dbe23c | 608 | goto register_error; |
abc0446a | 609 | } |
3c997079 MD |
610 | /* Populate lttng_event structure before event registration. */ |
611 | smp_wmb(); | |
baf20995 | 612 | break; |
ab2277d6 | 613 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
614 | /* |
615 | * Needs to be explicitly enabled after creation, since | |
616 | * we may want to apply filters. | |
617 | */ | |
618 | event->enabled = 0; | |
3c997079 MD |
619 | event->registered = 1; |
620 | /* | |
621 | * Populate lttng_event structure before event | |
622 | * registration. | |
623 | */ | |
624 | smp_wmb(); | |
625 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
626 | event_param->u.kprobe.symbol_name, |
627 | event_param->u.kprobe.offset, | |
628 | event_param->u.kprobe.addr, | |
629 | event); | |
abc0446a | 630 | if (ret) { |
4cf0bf51 | 631 | ret = -EINVAL; |
d6d808f3 | 632 | goto register_error; |
abc0446a | 633 | } |
edeb3137 MD |
634 | ret = try_module_get(event->desc->owner); |
635 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 636 | break; |
7371f44c MD |
637 | case LTTNG_KERNEL_KRETPROBE: |
638 | { | |
a90917c3 | 639 | struct lttng_event *event_return; |
7371f44c MD |
640 | |
641 | /* kretprobe defines 2 events */ | |
a0493bef MD |
642 | /* |
643 | * Needs to be explicitly enabled after creation, since | |
644 | * we may want to apply filters. | |
645 | */ | |
646 | event->enabled = 0; | |
3c997079 | 647 | event->registered = 1; |
7371f44c MD |
648 | event_return = |
649 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 650 | if (!event_return) { |
4cf0bf51 | 651 | ret = -ENOMEM; |
7371f44c | 652 | goto register_error; |
abc0446a | 653 | } |
7371f44c MD |
654 | event_return->chan = chan; |
655 | event_return->filter = filter; | |
656 | event_return->id = chan->free_event_id++; | |
a0493bef | 657 | event_return->enabled = 0; |
3c997079 MD |
658 | event_return->registered = 1; |
659 | event_return->instrumentation = itype; | |
7371f44c | 660 | /* |
a90917c3 | 661 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
662 | */ |
663 | smp_wmb(); | |
3c997079 | 664 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
665 | event_param->u.kretprobe.symbol_name, |
666 | event_param->u.kretprobe.offset, | |
667 | event_param->u.kretprobe.addr, | |
668 | event, event_return); | |
669 | if (ret) { | |
670 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 671 | ret = -EINVAL; |
7371f44c MD |
672 | goto register_error; |
673 | } | |
674 | /* Take 2 refs on the module: one per event. */ | |
675 | ret = try_module_get(event->desc->owner); | |
676 | WARN_ON_ONCE(!ret); | |
677 | ret = try_module_get(event->desc->owner); | |
678 | WARN_ON_ONCE(!ret); | |
a90917c3 | 679 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 680 | event_return); |
abc0446a | 681 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
682 | if (ret) { |
683 | kmem_cache_free(event_cache, event_return); | |
684 | module_put(event->desc->owner); | |
685 | module_put(event->desc->owner); | |
686 | goto statedump_error; | |
687 | } | |
688 | list_add(&event_return->list, &chan->session->events); | |
689 | break; | |
690 | } | |
ab2277d6 | 691 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
692 | /* |
693 | * Needs to be explicitly enabled after creation, since | |
694 | * we may want to apply filters. | |
695 | */ | |
696 | event->enabled = 0; | |
3c997079 MD |
697 | event->registered = 1; |
698 | /* | |
699 | * Populate lttng_event structure before event | |
700 | * registration. | |
701 | */ | |
702 | smp_wmb(); | |
703 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
704 | event_param->u.ftrace.symbol_name, |
705 | event); | |
abc0446a | 706 | if (ret) { |
e0a7a7c4 | 707 | goto register_error; |
abc0446a | 708 | } |
edeb3137 MD |
709 | ret = try_module_get(event->desc->owner); |
710 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 711 | break; |
1ec65de1 | 712 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 713 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
714 | /* |
715 | * Needs to be explicitly enabled after creation, since | |
716 | * we may want to apply filters. | |
717 | */ | |
718 | event->enabled = 0; | |
3c997079 MD |
719 | event->registered = 0; |
720 | event->desc = event_desc; | |
abc0446a | 721 | if (!event->desc) { |
4cf0bf51 | 722 | ret = -EINVAL; |
259b6cb3 | 723 | goto register_error; |
abc0446a | 724 | } |
1ec65de1 | 725 | break; |
baf20995 MD |
726 | default: |
727 | WARN_ON_ONCE(1); | |
4cf0bf51 | 728 | ret = -EINVAL; |
df07930b | 729 | goto register_error; |
baf20995 | 730 | } |
a90917c3 | 731 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
732 | WARN_ON_ONCE(ret > 0); |
733 | if (ret) { | |
c099397a | 734 | goto statedump_error; |
abc0446a | 735 | } |
3c997079 | 736 | hlist_add_head(&event->hlist, head); |
dda6a249 | 737 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
738 | return event; |
739 | ||
c099397a | 740 | statedump_error: |
259b6cb3 | 741 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 742 | register_error: |
11b5a3c2 | 743 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
744 | cache_error: |
745 | exist: | |
3c997079 | 746 | type_error: |
e5382b6d | 747 | full: |
4cf0bf51 | 748 | return ERR_PTR(ret); |
4e3c1b9b MD |
749 | } |
750 | ||
3c997079 MD |
751 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
752 | struct lttng_kernel_event *event_param, | |
753 | void *filter, | |
754 | const struct lttng_event_desc *event_desc, | |
755 | enum lttng_kernel_instrumentation itype) | |
756 | { | |
757 | struct lttng_event *event; | |
758 | ||
759 | mutex_lock(&sessions_mutex); | |
760 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
761 | itype); | |
762 | mutex_unlock(&sessions_mutex); | |
763 | return event; | |
764 | } | |
765 | ||
766 | /* Only used for tracepoints for now. */ | |
767 | static | |
768 | void register_event(struct lttng_event *event) | |
769 | { | |
770 | const struct lttng_event_desc *desc; | |
f127e61e | 771 | int ret = -EINVAL; |
3c997079 | 772 | |
3c997079 MD |
773 | if (event->registered) |
774 | return; | |
4ecb5ad5 | 775 | |
3c997079 | 776 | desc = event->desc; |
4ecb5ad5 MD |
777 | switch (event->instrumentation) { |
778 | case LTTNG_KERNEL_TRACEPOINT: | |
779 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
780 | desc->probe_callback, | |
781 | event); | |
782 | break; | |
783 | case LTTNG_KERNEL_SYSCALL: | |
784 | ret = lttng_syscall_filter_enable(event->chan, | |
785 | desc->name); | |
786 | break; | |
787 | case LTTNG_KERNEL_KPROBE: | |
788 | case LTTNG_KERNEL_KRETPROBE: | |
789 | case LTTNG_KERNEL_FUNCTION: | |
790 | case LTTNG_KERNEL_NOOP: | |
791 | ret = 0; | |
792 | break; | |
793 | default: | |
794 | WARN_ON_ONCE(1); | |
795 | } | |
3c997079 MD |
796 | if (!ret) |
797 | event->registered = 1; | |
798 | } | |
799 | ||
4e3c1b9b MD |
800 | /* |
801 | * Only used internally at session destruction. | |
802 | */ | |
a90917c3 | 803 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 804 | { |
4ecb5ad5 | 805 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
806 | int ret = -EINVAL; |
807 | ||
3c997079 MD |
808 | if (!event->registered) |
809 | return 0; | |
810 | ||
4ecb5ad5 | 811 | desc = event->desc; |
38d024ae | 812 | switch (event->instrumentation) { |
ab2277d6 | 813 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 814 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 815 | event->desc->probe_callback, |
11b5a3c2 | 816 | event); |
baf20995 | 817 | break; |
ab2277d6 | 818 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 819 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
820 | ret = 0; |
821 | break; | |
7371f44c MD |
822 | case LTTNG_KERNEL_KRETPROBE: |
823 | lttng_kretprobes_unregister(event); | |
824 | ret = 0; | |
825 | break; | |
ab2277d6 | 826 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
827 | lttng_ftrace_unregister(event); |
828 | ret = 0; | |
829 | break; | |
33a39a3c | 830 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
831 | ret = lttng_syscall_filter_disable(event->chan, |
832 | desc->name); | |
833 | break; | |
834 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
835 | ret = 0; |
836 | break; | |
baf20995 MD |
837 | default: |
838 | WARN_ON_ONCE(1); | |
839 | } | |
3c997079 MD |
840 | if (!ret) |
841 | event->registered = 0; | |
dda6a249 MD |
842 | return ret; |
843 | } | |
844 | ||
845 | /* | |
846 | * Only used internally at session destruction. | |
847 | */ | |
be066e6c | 848 | static |
a90917c3 | 849 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 850 | { |
edeb3137 MD |
851 | switch (event->instrumentation) { |
852 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 853 | lttng_event_put(event->desc); |
edeb3137 MD |
854 | break; |
855 | case LTTNG_KERNEL_KPROBE: | |
856 | module_put(event->desc->owner); | |
857 | lttng_kprobes_destroy_private(event); | |
858 | break; | |
7371f44c MD |
859 | case LTTNG_KERNEL_KRETPROBE: |
860 | module_put(event->desc->owner); | |
861 | lttng_kretprobes_destroy_private(event); | |
862 | break; | |
edeb3137 MD |
863 | case LTTNG_KERNEL_FUNCTION: |
864 | module_put(event->desc->owner); | |
865 | lttng_ftrace_destroy_private(event); | |
866 | break; | |
259b6cb3 | 867 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 868 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 869 | break; |
edeb3137 MD |
870 | default: |
871 | WARN_ON_ONCE(1); | |
872 | } | |
dda6a249 | 873 | list_del(&event->list); |
8070f5c0 | 874 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 875 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
876 | } |
877 | ||
e0130fab MD |
878 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
879 | { | |
880 | int ret; | |
881 | ||
882 | if (pid < -1) | |
883 | return -EINVAL; | |
884 | mutex_lock(&sessions_mutex); | |
885 | if (pid == -1) { | |
886 | /* track all pids: destroy tracker. */ | |
887 | if (session->pid_tracker) { | |
888 | struct lttng_pid_tracker *lpf; | |
889 | ||
890 | lpf = session->pid_tracker; | |
891 | rcu_assign_pointer(session->pid_tracker, NULL); | |
892 | synchronize_trace(); | |
893 | lttng_pid_tracker_destroy(lpf); | |
894 | } | |
895 | ret = 0; | |
896 | } else { | |
897 | if (!session->pid_tracker) { | |
898 | struct lttng_pid_tracker *lpf; | |
899 | ||
900 | lpf = lttng_pid_tracker_create(); | |
901 | if (!lpf) { | |
902 | ret = -ENOMEM; | |
903 | goto unlock; | |
904 | } | |
905 | ret = lttng_pid_tracker_add(lpf, pid); | |
906 | rcu_assign_pointer(session->pid_tracker, lpf); | |
907 | } else { | |
908 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
909 | } | |
910 | } | |
911 | unlock: | |
912 | mutex_unlock(&sessions_mutex); | |
913 | return ret; | |
914 | } | |
915 | ||
916 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
917 | { | |
918 | int ret; | |
919 | ||
920 | if (pid < -1) | |
921 | return -EINVAL; | |
922 | mutex_lock(&sessions_mutex); | |
923 | if (pid == -1) { | |
924 | /* untrack all pids: replace by empty tracker. */ | |
925 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
926 | struct lttng_pid_tracker *lpf; | |
927 | ||
928 | lpf = lttng_pid_tracker_create(); | |
929 | if (!lpf) { | |
930 | ret = -ENOMEM; | |
931 | goto unlock; | |
932 | } | |
933 | rcu_assign_pointer(session->pid_tracker, lpf); | |
934 | synchronize_trace(); | |
935 | if (old_lpf) | |
936 | lttng_pid_tracker_destroy(old_lpf); | |
937 | ret = 0; | |
938 | } else { | |
939 | if (!session->pid_tracker) { | |
940 | ret = -ENOENT; | |
941 | goto unlock; | |
942 | } | |
943 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
944 | } | |
945 | unlock: | |
946 | mutex_unlock(&sessions_mutex); | |
947 | return ret; | |
948 | } | |
949 | ||
7e6f9ef6 MD |
950 | static |
951 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
952 | { | |
953 | struct lttng_session *session = m->private; | |
954 | struct lttng_pid_tracker *lpf; | |
955 | struct lttng_pid_hash_node *e; | |
956 | int iter = 0, i; | |
957 | ||
958 | mutex_lock(&sessions_mutex); | |
959 | lpf = session->pid_tracker; | |
960 | if (lpf) { | |
961 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
962 | struct hlist_head *head = &lpf->pid_hash[i]; | |
963 | ||
f934e302 | 964 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
965 | if (iter++ >= *pos) |
966 | return e; | |
967 | } | |
968 | } | |
969 | } else { | |
970 | /* PID tracker disabled. */ | |
971 | if (iter >= *pos && iter == 0) { | |
972 | return session; /* empty tracker */ | |
973 | } | |
974 | iter++; | |
975 | } | |
976 | /* End of list */ | |
977 | return NULL; | |
978 | } | |
979 | ||
980 | /* Called with sessions_mutex held. */ | |
981 | static | |
982 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
983 | { | |
984 | struct lttng_session *session = m->private; | |
985 | struct lttng_pid_tracker *lpf; | |
986 | struct lttng_pid_hash_node *e; | |
987 | int iter = 0, i; | |
988 | ||
989 | (*ppos)++; | |
990 | lpf = session->pid_tracker; | |
991 | if (lpf) { | |
992 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
993 | struct hlist_head *head = &lpf->pid_hash[i]; | |
994 | ||
f934e302 | 995 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
996 | if (iter++ >= *ppos) |
997 | return e; | |
998 | } | |
999 | } | |
1000 | } else { | |
1001 | /* PID tracker disabled. */ | |
1002 | if (iter >= *ppos && iter == 0) | |
1003 | return session; /* empty tracker */ | |
1004 | iter++; | |
1005 | } | |
1006 | ||
1007 | /* End of list */ | |
1008 | return NULL; | |
1009 | } | |
1010 | ||
1011 | static | |
1012 | void pid_list_stop(struct seq_file *m, void *p) | |
1013 | { | |
1014 | mutex_unlock(&sessions_mutex); | |
1015 | } | |
1016 | ||
1017 | static | |
1018 | int pid_list_show(struct seq_file *m, void *p) | |
1019 | { | |
1020 | int pid; | |
1021 | ||
1022 | if (p == m->private) { | |
1023 | /* Tracker disabled. */ | |
1024 | pid = -1; | |
1025 | } else { | |
1026 | const struct lttng_pid_hash_node *e = p; | |
1027 | ||
1028 | pid = lttng_pid_tracker_get_node_pid(e); | |
1029 | } | |
1030 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static | |
1035 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1036 | .start = pid_list_start, | |
1037 | .next = pid_list_next, | |
1038 | .stop = pid_list_stop, | |
1039 | .show = pid_list_show, | |
1040 | }; | |
1041 | ||
1042 | static | |
1043 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1044 | { | |
1045 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1046 | } | |
1047 | ||
1048 | static | |
1049 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1050 | { | |
1051 | struct seq_file *m = file->private_data; | |
1052 | struct lttng_session *session = m->private; | |
1053 | int ret; | |
1054 | ||
1055 | WARN_ON_ONCE(!session); | |
1056 | ret = seq_release(inode, file); | |
1057 | if (!ret && session) | |
1058 | fput(session->file); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1063 | .owner = THIS_MODULE, | |
1064 | .open = lttng_tracker_pids_list_open, | |
1065 | .read = seq_read, | |
1066 | .llseek = seq_lseek, | |
1067 | .release = lttng_tracker_pids_list_release, | |
1068 | }; | |
1069 | ||
1070 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1071 | { | |
1072 | struct file *tracker_pids_list_file; | |
1073 | struct seq_file *m; | |
1074 | int file_fd, ret; | |
1075 | ||
1076 | file_fd = lttng_get_unused_fd(); | |
1077 | if (file_fd < 0) { | |
1078 | ret = file_fd; | |
1079 | goto fd_error; | |
1080 | } | |
1081 | ||
1082 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1083 | <tng_tracker_pids_list_fops, | |
1084 | NULL, O_RDWR); | |
1085 | if (IS_ERR(tracker_pids_list_file)) { | |
1086 | ret = PTR_ERR(tracker_pids_list_file); | |
1087 | goto file_error; | |
1088 | } | |
9c1f4643 MD |
1089 | if (atomic_long_add_unless(&session->file->f_count, |
1090 | 1, INT_MAX) == INT_MAX) { | |
1091 | goto refcount_error; | |
1092 | } | |
7e6f9ef6 MD |
1093 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1094 | if (ret < 0) | |
1095 | goto open_error; | |
1096 | m = tracker_pids_list_file->private_data; | |
1097 | m->private = session; | |
1098 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1099 | |
1100 | return file_fd; | |
1101 | ||
1102 | open_error: | |
9c1f4643 MD |
1103 | atomic_long_dec(&session->file->f_count); |
1104 | refcount_error: | |
7e6f9ef6 MD |
1105 | fput(tracker_pids_list_file); |
1106 | file_error: | |
1107 | put_unused_fd(file_fd); | |
1108 | fd_error: | |
1109 | return ret; | |
1110 | } | |
1111 | ||
3c997079 MD |
1112 | /* |
1113 | * Enabler management. | |
1114 | */ | |
1115 | static | |
4ecb5ad5 MD |
1116 | int lttng_match_enabler_wildcard(const char *desc_name, |
1117 | const char *name) | |
3c997079 | 1118 | { |
3c997079 | 1119 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1120 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1121 | return 0; |
1122 | return 1; | |
1123 | } | |
1124 | ||
1125 | static | |
4ecb5ad5 MD |
1126 | int lttng_match_enabler_name(const char *desc_name, |
1127 | const char *name) | |
3c997079 | 1128 | { |
4ecb5ad5 | 1129 | if (strcmp(desc_name, name)) |
3c997079 MD |
1130 | return 0; |
1131 | return 1; | |
1132 | } | |
1133 | ||
1134 | static | |
1135 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1136 | struct lttng_enabler *enabler) | |
1137 | { | |
4ecb5ad5 MD |
1138 | const char *desc_name, *enabler_name; |
1139 | ||
1140 | enabler_name = enabler->event_param.name; | |
1141 | switch (enabler->event_param.instrumentation) { | |
1142 | case LTTNG_KERNEL_TRACEPOINT: | |
1143 | desc_name = desc->name; | |
1144 | break; | |
1145 | case LTTNG_KERNEL_SYSCALL: | |
1146 | desc_name = desc->name; | |
1147 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1148 | desc_name += strlen("compat_"); | |
1149 | if (!strncmp(desc_name, "syscall_exit_", | |
1150 | strlen("syscall_exit_"))) { | |
1151 | desc_name += strlen("syscall_exit_"); | |
1152 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1153 | strlen("syscall_entry_"))) { | |
1154 | desc_name += strlen("syscall_entry_"); | |
1155 | } else { | |
1156 | WARN_ON_ONCE(1); | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | break; | |
1160 | default: | |
1161 | WARN_ON_ONCE(1); | |
1162 | return -EINVAL; | |
1163 | } | |
3c997079 MD |
1164 | switch (enabler->type) { |
1165 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1166 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1167 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1168 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1169 | default: |
1170 | return -EINVAL; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | static | |
1175 | int lttng_event_match_enabler(struct lttng_event *event, | |
1176 | struct lttng_enabler *enabler) | |
1177 | { | |
33a39a3c MD |
1178 | if (enabler->event_param.instrumentation != event->instrumentation) |
1179 | return 0; | |
3c997079 MD |
1180 | if (lttng_desc_match_enabler(event->desc, enabler) |
1181 | && event->chan == enabler->chan) | |
1182 | return 1; | |
1183 | else | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static | |
1188 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1189 | struct lttng_enabler *enabler) | |
1190 | { | |
1191 | struct lttng_enabler_ref *enabler_ref; | |
1192 | ||
1193 | list_for_each_entry(enabler_ref, | |
1194 | &event->enablers_ref_head, node) { | |
1195 | if (enabler_ref->ref == enabler) | |
1196 | return enabler_ref; | |
1197 | } | |
1198 | return NULL; | |
1199 | } | |
1200 | ||
3c997079 | 1201 | static |
33a39a3c | 1202 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1203 | { |
1204 | struct lttng_session *session = enabler->chan->session; | |
1205 | struct lttng_probe_desc *probe_desc; | |
1206 | const struct lttng_event_desc *desc; | |
1207 | int i; | |
1208 | struct list_head *probe_list; | |
1209 | ||
1210 | probe_list = lttng_get_probe_list_head(); | |
1211 | /* | |
1212 | * For each probe event, if we find that a probe event matches | |
1213 | * our enabler, create an associated lttng_event if not | |
1214 | * already present. | |
1215 | */ | |
1216 | list_for_each_entry(probe_desc, probe_list, head) { | |
1217 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1218 | int found = 0; | |
1219 | struct hlist_head *head; | |
1220 | const char *event_name; | |
1221 | size_t name_len; | |
1222 | uint32_t hash; | |
1223 | struct lttng_event *event; | |
1224 | ||
1225 | desc = probe_desc->event_desc[i]; | |
1226 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1227 | continue; | |
1228 | event_name = desc->name; | |
1229 | name_len = strlen(event_name); | |
1230 | ||
1231 | /* | |
1232 | * Check if already created. | |
1233 | */ | |
1234 | hash = jhash(event_name, name_len, 0); | |
1235 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1236 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1237 | if (event->desc == desc |
1238 | && event->chan == enabler->chan) | |
1239 | found = 1; | |
1240 | } | |
1241 | if (found) | |
1242 | continue; | |
1243 | ||
1244 | /* | |
1245 | * We need to create an event for this | |
1246 | * event probe. | |
1247 | */ | |
1248 | event = _lttng_event_create(enabler->chan, | |
1249 | NULL, NULL, desc, | |
1250 | LTTNG_KERNEL_TRACEPOINT); | |
1251 | if (!event) { | |
1252 | printk(KERN_INFO "Unable to create event %s\n", | |
1253 | probe_desc->event_desc[i]->name); | |
1254 | } | |
1255 | } | |
1256 | } | |
1257 | } | |
1258 | ||
33a39a3c MD |
1259 | static |
1260 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1261 | { | |
1262 | int ret; | |
1263 | ||
1264 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1265 | WARN_ON_ONCE(ret); | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Create struct lttng_event if it is missing and present in the list of | |
1270 | * tracepoint probes. | |
1271 | * Should be called with sessions mutex held. | |
1272 | */ | |
1273 | static | |
1274 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1275 | { | |
1276 | switch (enabler->event_param.instrumentation) { | |
1277 | case LTTNG_KERNEL_TRACEPOINT: | |
1278 | lttng_create_tracepoint_if_missing(enabler); | |
1279 | break; | |
1280 | case LTTNG_KERNEL_SYSCALL: | |
1281 | lttng_create_syscall_if_missing(enabler); | |
1282 | break; | |
1283 | default: | |
1284 | WARN_ON_ONCE(1); | |
1285 | break; | |
1286 | } | |
1287 | } | |
1288 | ||
3c997079 MD |
1289 | /* |
1290 | * Create events associated with an enabler (if not already present), | |
1291 | * and add backward reference from the event to the enabler. | |
1292 | * Should be called with sessions mutex held. | |
1293 | */ | |
1294 | static | |
1295 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1296 | { | |
1297 | struct lttng_session *session = enabler->chan->session; | |
1298 | struct lttng_event *event; | |
1299 | ||
1300 | /* First ensure that probe events are created for this enabler. */ | |
1301 | lttng_create_event_if_missing(enabler); | |
1302 | ||
1303 | /* For each event matching enabler in session event list. */ | |
1304 | list_for_each_entry(event, &session->events, list) { | |
1305 | struct lttng_enabler_ref *enabler_ref; | |
1306 | ||
1307 | if (!lttng_event_match_enabler(event, enabler)) | |
1308 | continue; | |
1309 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1310 | if (!enabler_ref) { | |
1311 | /* | |
1312 | * If no backward ref, create it. | |
1313 | * Add backward ref from event to enabler. | |
1314 | */ | |
1315 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1316 | if (!enabler_ref) | |
1317 | return -ENOMEM; | |
1318 | enabler_ref->ref = enabler; | |
1319 | list_add(&enabler_ref->node, | |
1320 | &event->enablers_ref_head); | |
1321 | } | |
1322 | ||
f127e61e MD |
1323 | /* |
1324 | * Link filter bytecodes if not linked yet. | |
1325 | */ | |
1326 | lttng_enabler_event_link_bytecode(event, enabler); | |
1327 | ||
3c997079 MD |
1328 | /* TODO: merge event context. */ |
1329 | } | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Called at module load: connect the probe on all enablers matching | |
1335 | * this event. | |
1336 | * Called with sessions lock held. | |
1337 | */ | |
1338 | int lttng_fix_pending_events(void) | |
1339 | { | |
1340 | struct lttng_session *session; | |
1341 | ||
1342 | list_for_each_entry(session, &sessions, list) | |
1343 | lttng_session_lazy_sync_enablers(session); | |
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1348 | struct lttng_kernel_event *event_param, | |
1349 | struct lttng_channel *chan) | |
1350 | { | |
1351 | struct lttng_enabler *enabler; | |
1352 | ||
1353 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1354 | if (!enabler) | |
1355 | return NULL; | |
1356 | enabler->type = type; | |
07dfc1d0 | 1357 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1358 | memcpy(&enabler->event_param, event_param, |
1359 | sizeof(enabler->event_param)); | |
1360 | enabler->chan = chan; | |
1361 | /* ctx left NULL */ | |
4fd19d8a | 1362 | enabler->enabled = 0; |
3c997079 MD |
1363 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1364 | mutex_lock(&sessions_mutex); | |
1365 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1366 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1367 | mutex_unlock(&sessions_mutex); | |
1368 | return enabler; | |
1369 | } | |
1370 | ||
1371 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1372 | { | |
1373 | mutex_lock(&sessions_mutex); | |
1374 | enabler->enabled = 1; | |
1375 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1376 | mutex_unlock(&sessions_mutex); | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1381 | { | |
1382 | mutex_lock(&sessions_mutex); | |
1383 | enabler->enabled = 0; | |
1384 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1385 | mutex_unlock(&sessions_mutex); | |
1386 | return 0; | |
1387 | } | |
1388 | ||
07dfc1d0 MD |
1389 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1390 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1391 | { | |
1392 | struct lttng_filter_bytecode_node *bytecode_node; | |
1393 | uint32_t bytecode_len; | |
1394 | int ret; | |
1395 | ||
1396 | ret = get_user(bytecode_len, &bytecode->len); | |
1397 | if (ret) | |
1398 | return ret; | |
1399 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1400 | GFP_KERNEL); | |
1401 | if (!bytecode_node) | |
1402 | return -ENOMEM; | |
1403 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1404 | sizeof(*bytecode) + bytecode_len); | |
1405 | if (ret) | |
1406 | goto error_free; | |
1407 | bytecode_node->enabler = enabler; | |
1408 | /* Enforce length based on allocated size */ | |
1409 | bytecode_node->bc.len = bytecode_len; | |
1410 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1411 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1412 | return 0; | |
1413 | ||
1414 | error_free: | |
1415 | kfree(bytecode_node); | |
1416 | return ret; | |
1417 | } | |
1418 | ||
3c997079 MD |
1419 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1420 | struct lttng_kernel_context *context_param) | |
1421 | { | |
1422 | return -ENOSYS; | |
1423 | } | |
1424 | ||
1425 | static | |
1426 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1427 | { | |
07dfc1d0 MD |
1428 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1429 | ||
1430 | /* Destroy filter bytecode */ | |
1431 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1432 | &enabler->filter_bytecode_head, node) { | |
1433 | kfree(filter_node); | |
1434 | } | |
1435 | ||
3c997079 MD |
1436 | /* Destroy contexts */ |
1437 | lttng_destroy_context(enabler->ctx); | |
1438 | ||
1439 | list_del(&enabler->node); | |
1440 | kfree(enabler); | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * lttng_session_sync_enablers should be called just before starting a | |
1445 | * session. | |
1446 | * Should be called with sessions mutex held. | |
1447 | */ | |
1448 | static | |
1449 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1450 | { | |
1451 | struct lttng_enabler *enabler; | |
1452 | struct lttng_event *event; | |
1453 | ||
1454 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1455 | lttng_enabler_ref_events(enabler); | |
1456 | /* | |
1457 | * For each event, if at least one of its enablers is enabled, | |
1458 | * and its channel and session transient states are enabled, we | |
1459 | * enable the event, else we disable it. | |
1460 | */ | |
1461 | list_for_each_entry(event, &session->events, list) { | |
1462 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1463 | struct lttng_bytecode_runtime *runtime; |
1464 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1465 | |
4ecb5ad5 MD |
1466 | switch (event->instrumentation) { |
1467 | case LTTNG_KERNEL_TRACEPOINT: | |
1468 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1469 | /* Enable events */ |
1470 | list_for_each_entry(enabler_ref, | |
1471 | &event->enablers_ref_head, node) { | |
1472 | if (enabler_ref->ref->enabled) { | |
1473 | enabled = 1; | |
1474 | break; | |
1475 | } | |
1476 | } | |
4ecb5ad5 MD |
1477 | break; |
1478 | default: | |
3c997079 MD |
1479 | /* Not handled with lazy sync. */ |
1480 | continue; | |
1481 | } | |
1482 | /* | |
1483 | * Enabled state is based on union of enablers, with | |
1484 | * intesection of session and channel transient enable | |
1485 | * states. | |
1486 | */ | |
1487 | enabled = enabled && session->tstate && event->chan->tstate; | |
1488 | ||
1489 | ACCESS_ONCE(event->enabled) = enabled; | |
1490 | /* | |
1491 | * Sync tracepoint registration with event enabled | |
1492 | * state. | |
1493 | */ | |
1494 | if (enabled) { | |
1495 | register_event(event); | |
1496 | } else { | |
1497 | _lttng_event_unregister(event); | |
1498 | } | |
07dfc1d0 MD |
1499 | |
1500 | /* Check if has enablers without bytecode enabled */ | |
1501 | list_for_each_entry(enabler_ref, | |
1502 | &event->enablers_ref_head, node) { | |
1503 | if (enabler_ref->ref->enabled | |
1504 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1505 | has_enablers_without_bytecode = 1; | |
1506 | break; | |
1507 | } | |
1508 | } | |
1509 | event->has_enablers_without_bytecode = | |
1510 | has_enablers_without_bytecode; | |
1511 | ||
1512 | /* Enable filters */ | |
1513 | list_for_each_entry(runtime, | |
f127e61e | 1514 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1515 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1516 | } |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Apply enablers to session events, adding events to session if need | |
1521 | * be. It is required after each modification applied to an active | |
1522 | * session, and right before session "start". | |
1523 | * "lazy" sync means we only sync if required. | |
1524 | * Should be called with sessions mutex held. | |
1525 | */ | |
1526 | static | |
1527 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1528 | { | |
1529 | /* We can skip if session is not active */ | |
1530 | if (!session->active) | |
1531 | return; | |
1532 | lttng_session_sync_enablers(session); | |
1533 | } | |
1534 | ||
1ec3f75a | 1535 | /* |
d83004aa JD |
1536 | * Serialize at most one packet worth of metadata into a metadata |
1537 | * channel. | |
92d9f5e6 MD |
1538 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1539 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1540 | * allows us to do racy operations such as looking for remaining space left in | |
1541 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1542 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1543 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1544 | * Returns the number of bytes written in the channel, 0 if no data |
1545 | * was written and a negative value on error. | |
1ec3f75a | 1546 | */ |
b3b8072b MD |
1547 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1548 | struct channel *chan) | |
d83004aa JD |
1549 | { |
1550 | struct lib_ring_buffer_ctx ctx; | |
1551 | int ret = 0; | |
1552 | size_t len, reserve_len; | |
1553 | ||
f613e3e6 | 1554 | /* |
92d9f5e6 MD |
1555 | * Ensure we support mutiple get_next / put sequences followed by |
1556 | * put_next. The metadata cache lock protects reading the metadata | |
1557 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1558 | * "flush" operations on the buffer invoked by different processes. | |
1559 | * Moreover, since the metadata cache memory can be reallocated, we | |
1560 | * need to have exclusive access against updates even though we only | |
1561 | * read it. | |
f613e3e6 | 1562 | */ |
92d9f5e6 | 1563 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1564 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1565 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1566 | goto end; |
f613e3e6 | 1567 | |
9616f0bf JD |
1568 | /* Metadata regenerated, change the version. */ |
1569 | if (stream->metadata_cache->version != stream->version) | |
1570 | stream->version = stream->metadata_cache->version; | |
1571 | ||
d83004aa | 1572 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1573 | stream->metadata_in; |
9de2c215 | 1574 | if (!len) |
de23d59d | 1575 | goto end; |
d83004aa | 1576 | reserve_len = min_t(size_t, |
b3b8072b | 1577 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1578 | len); |
b3b8072b | 1579 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1580 | sizeof(char), -1); |
1581 | /* | |
1582 | * If reservation failed, return an error to the caller. | |
1583 | */ | |
b3b8072b | 1584 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1585 | if (ret != 0) { |
1586 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1587 | goto end; | |
1588 | } | |
b3b8072b | 1589 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1590 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1591 | reserve_len); |
b3b8072b | 1592 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1593 | stream->metadata_in += reserve_len; |
d83004aa JD |
1594 | ret = reserve_len; |
1595 | ||
1596 | end: | |
92d9f5e6 | 1597 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1598 | return ret; |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * Write the metadata to the metadata cache. | |
1603 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1604 | * The metadata cache lock protects us from concurrent read access from |
1605 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1606 | */ |
a90917c3 | 1607 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1608 | const char *fmt, ...) |
1609 | { | |
c099397a | 1610 | char *str; |
d83004aa | 1611 | size_t len; |
c099397a | 1612 | va_list ap; |
d83004aa | 1613 | struct lttng_metadata_stream *stream; |
c099397a MD |
1614 | |
1615 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1616 | ||
1617 | va_start(ap, fmt); | |
1618 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1619 | va_end(ap); | |
1620 | if (!str) | |
1621 | return -ENOMEM; | |
1622 | ||
1ec3f75a | 1623 | len = strlen(str); |
92d9f5e6 | 1624 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1625 | if (session->metadata_cache->metadata_written + len > |
1626 | session->metadata_cache->cache_alloc) { | |
1627 | char *tmp_cache_realloc; | |
1628 | unsigned int tmp_cache_alloc_size; | |
1629 | ||
1630 | tmp_cache_alloc_size = max_t(unsigned int, | |
1631 | session->metadata_cache->cache_alloc + len, | |
1632 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1633 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1634 | if (!tmp_cache_realloc) |
1635 | goto err; | |
a606b6e8 ML |
1636 | if (session->metadata_cache->data) { |
1637 | memcpy(tmp_cache_realloc, | |
1638 | session->metadata_cache->data, | |
1639 | session->metadata_cache->cache_alloc); | |
1640 | vfree(session->metadata_cache->data); | |
1641 | } | |
1642 | ||
d83004aa JD |
1643 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1644 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1645 | } |
d83004aa JD |
1646 | memcpy(session->metadata_cache->data + |
1647 | session->metadata_cache->metadata_written, | |
1648 | str, len); | |
1649 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1650 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1651 | kfree(str); |
d83004aa JD |
1652 | |
1653 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1654 | wake_up_interruptible(&stream->read_wait); | |
1655 | ||
1656 | return 0; | |
1657 | ||
1658 | err: | |
92d9f5e6 | 1659 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1660 | kfree(str); |
1661 | return -ENOMEM; | |
c099397a MD |
1662 | } |
1663 | ||
d83004aa JD |
1664 | /* |
1665 | * Must be called with sessions_mutex held. | |
1666 | */ | |
c099397a | 1667 | static |
a90917c3 | 1668 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 1669 | const struct lttng_event_field *field) |
c099397a | 1670 | { |
c099397a | 1671 | int ret = 0; |
c099397a | 1672 | |
8070f5c0 MD |
1673 | switch (field->type.atype) { |
1674 | case atype_integer: | |
1675 | ret = lttng_metadata_printf(session, | |
244465ab | 1676 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1677 | field->type.u.basic.integer.size, |
1678 | field->type.u.basic.integer.alignment, | |
1679 | field->type.u.basic.integer.signedness, | |
1680 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1681 | ? "none" | |
1682 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1683 | ? "UTF8" | |
1684 | : "ASCII", | |
1685 | field->type.u.basic.integer.base, | |
d669b02d | 1686 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1687 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1688 | #else |
8070f5c0 | 1689 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1690 | #endif |
8070f5c0 MD |
1691 | field->name); |
1692 | break; | |
1693 | case atype_enum: | |
1694 | ret = lttng_metadata_printf(session, | |
244465ab | 1695 | " %s _%s;\n", |
8070f5c0 MD |
1696 | field->type.u.basic.enumeration.name, |
1697 | field->name); | |
1698 | break; | |
1699 | case atype_array: | |
1700 | { | |
1701 | const struct lttng_basic_type *elem_type; | |
1702 | ||
1703 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 MD |
1704 | if (field->type.u.array.elem_alignment) { |
1705 | ret = lttng_metadata_printf(session, | |
1706 | " struct { } align(%u) _%s_padding;\n", | |
1707 | field->type.u.array.elem_alignment * CHAR_BIT, | |
1708 | field->name); | |
1709 | if (ret) | |
1710 | return ret; | |
1711 | } | |
8070f5c0 | 1712 | ret = lttng_metadata_printf(session, |
244465ab | 1713 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1714 | elem_type->u.basic.integer.size, |
1715 | elem_type->u.basic.integer.alignment, | |
1716 | elem_type->u.basic.integer.signedness, | |
1717 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1718 | ? "none" | |
1719 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1720 | ? "UTF8" | |
1721 | : "ASCII", | |
1722 | elem_type->u.basic.integer.base, | |
d669b02d | 1723 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1724 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1725 | #else |
8070f5c0 | 1726 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1727 | #endif |
8070f5c0 MD |
1728 | field->name, field->type.u.array.length); |
1729 | break; | |
1730 | } | |
1731 | case atype_sequence: | |
1732 | { | |
1733 | const struct lttng_basic_type *elem_type; | |
1734 | const struct lttng_basic_type *length_type; | |
1735 | ||
1736 | elem_type = &field->type.u.sequence.elem_type; | |
1737 | length_type = &field->type.u.sequence.length_type; | |
1738 | ret = lttng_metadata_printf(session, | |
1739 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1740 | length_type->u.basic.integer.size, |
32257272 | 1741 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1742 | length_type->u.basic.integer.signedness, |
1743 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1744 | ? "none" | |
0635cdd4 | 1745 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1746 | ? "UTF8" |
0635cdd4 | 1747 | : "ASCII"), |
8070f5c0 | 1748 | length_type->u.basic.integer.base, |
d669b02d | 1749 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1750 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1751 | #else |
0635cdd4 | 1752 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1753 | #endif |
27d2368e MD |
1754 | field->name); |
1755 | if (ret) | |
1756 | return ret; | |
1757 | ||
43803cf2 MD |
1758 | if (field->type.u.sequence.elem_alignment) { |
1759 | ret = lttng_metadata_printf(session, | |
1760 | " struct { } align(%u) _%s_padding;\n", | |
1761 | field->type.u.sequence.elem_alignment * CHAR_BIT, | |
1762 | field->name); | |
1763 | if (ret) | |
1764 | return ret; | |
1765 | } | |
27d2368e | 1766 | ret = lttng_metadata_printf(session, |
244465ab | 1767 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1768 | elem_type->u.basic.integer.size, |
32257272 | 1769 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1770 | elem_type->u.basic.integer.signedness, |
1771 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1772 | ? "none" | |
0635cdd4 | 1773 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1774 | ? "UTF8" |
0635cdd4 | 1775 | : "ASCII"), |
8070f5c0 | 1776 | elem_type->u.basic.integer.base, |
d669b02d | 1777 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1778 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1779 | #else |
8070f5c0 | 1780 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1781 | #endif |
8070f5c0 | 1782 | field->name, |
27d2368e | 1783 | field->name); |
8070f5c0 MD |
1784 | break; |
1785 | } | |
c099397a | 1786 | |
8070f5c0 MD |
1787 | case atype_string: |
1788 | /* Default encoding is UTF8 */ | |
1789 | ret = lttng_metadata_printf(session, | |
244465ab | 1790 | " string%s _%s;\n", |
8070f5c0 MD |
1791 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1792 | " { encoding = ASCII; }" : "", | |
1793 | field->name); | |
1794 | break; | |
1795 | default: | |
1796 | WARN_ON_ONCE(1); | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | return ret; | |
1800 | } | |
1801 | ||
1802 | static | |
a90917c3 | 1803 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1804 | struct lttng_ctx *ctx) |
1805 | { | |
1806 | int ret = 0; | |
1807 | int i; | |
1808 | ||
1809 | if (!ctx) | |
1810 | return 0; | |
1811 | for (i = 0; i < ctx->nr_fields; i++) { | |
1812 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1813 | ||
a90917c3 | 1814 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1815 | if (ret) |
1816 | return ret; | |
1817 | } | |
1818 | return ret; | |
1819 | } | |
1820 | ||
1821 | static | |
a90917c3 MD |
1822 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1823 | struct lttng_event *event) | |
8070f5c0 MD |
1824 | { |
1825 | const struct lttng_event_desc *desc = event->desc; | |
1826 | int ret = 0; | |
1827 | int i; | |
1828 | ||
1829 | for (i = 0; i < desc->nr_fields; i++) { | |
1830 | const struct lttng_event_field *field = &desc->fields[i]; | |
1831 | ||
a90917c3 | 1832 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1833 | if (ret) |
1834 | return ret; | |
c099397a MD |
1835 | } |
1836 | return ret; | |
1837 | } | |
1838 | ||
d83004aa JD |
1839 | /* |
1840 | * Must be called with sessions_mutex held. | |
1841 | */ | |
c099397a | 1842 | static |
a90917c3 MD |
1843 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1844 | struct lttng_channel *chan, | |
1845 | struct lttng_event *event) | |
c099397a MD |
1846 | { |
1847 | int ret = 0; | |
1848 | ||
1849 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1850 | return 0; | |
d83004aa | 1851 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1852 | return 0; |
1853 | ||
1854 | ret = lttng_metadata_printf(session, | |
1855 | "event {\n" | |
ae734547 | 1856 | " name = \"%s\";\n" |
c099397a | 1857 | " id = %u;\n" |
b9074a1b | 1858 | " stream_id = %u;\n", |
c099397a MD |
1859 | event->desc->name, |
1860 | event->id, | |
1861 | event->chan->id); | |
1862 | if (ret) | |
1863 | goto end; | |
1864 | ||
b9074a1b MD |
1865 | if (event->ctx) { |
1866 | ret = lttng_metadata_printf(session, | |
1867 | " context := struct {\n"); | |
1868 | if (ret) | |
1869 | goto end; | |
1870 | } | |
a90917c3 | 1871 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1872 | if (ret) |
1873 | goto end; | |
b9074a1b MD |
1874 | if (event->ctx) { |
1875 | ret = lttng_metadata_printf(session, | |
1876 | " };\n"); | |
1877 | if (ret) | |
1878 | goto end; | |
1879 | } | |
8070f5c0 MD |
1880 | |
1881 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1882 | " fields := struct {\n" |
1883 | ); | |
1884 | if (ret) | |
1885 | goto end; | |
1886 | ||
a90917c3 | 1887 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1888 | if (ret) |
1889 | goto end; | |
1890 | ||
1891 | /* | |
1892 | * LTTng space reservation can only reserve multiples of the | |
1893 | * byte size. | |
1894 | */ | |
1895 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1896 | " };\n" |
1897 | "};\n\n"); | |
c099397a MD |
1898 | if (ret) |
1899 | goto end; | |
1900 | ||
c099397a MD |
1901 | event->metadata_dumped = 1; |
1902 | end: | |
1903 | return ret; | |
1904 | ||
1905 | } | |
1906 | ||
d83004aa JD |
1907 | /* |
1908 | * Must be called with sessions_mutex held. | |
1909 | */ | |
c099397a | 1910 | static |
a90917c3 MD |
1911 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1912 | struct lttng_channel *chan) | |
c099397a MD |
1913 | { |
1914 | int ret = 0; | |
1915 | ||
1916 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1917 | return 0; | |
d83004aa JD |
1918 | |
1919 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1920 | return 0; |
1921 | ||
1922 | WARN_ON_ONCE(!chan->header_type); | |
1923 | ret = lttng_metadata_printf(session, | |
1924 | "stream {\n" | |
1925 | " id = %u;\n" | |
9115fbdc | 1926 | " event.header := %s;\n" |
b9074a1b | 1927 | " packet.context := struct packet_context;\n", |
c099397a MD |
1928 | chan->id, |
1929 | chan->header_type == 1 ? "struct event_header_compact" : | |
1930 | "struct event_header_large"); | |
1931 | if (ret) | |
1932 | goto end; | |
1933 | ||
b9074a1b MD |
1934 | if (chan->ctx) { |
1935 | ret = lttng_metadata_printf(session, | |
1936 | " event.context := struct {\n"); | |
1937 | if (ret) | |
1938 | goto end; | |
1939 | } | |
a90917c3 | 1940 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1941 | if (ret) |
1942 | goto end; | |
b9074a1b MD |
1943 | if (chan->ctx) { |
1944 | ret = lttng_metadata_printf(session, | |
1945 | " };\n"); | |
1946 | if (ret) | |
1947 | goto end; | |
1948 | } | |
8070f5c0 MD |
1949 | |
1950 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1951 | "};\n\n"); |
8070f5c0 | 1952 | |
c099397a MD |
1953 | chan->metadata_dumped = 1; |
1954 | end: | |
1955 | return ret; | |
1956 | } | |
1957 | ||
d83004aa JD |
1958 | /* |
1959 | * Must be called with sessions_mutex held. | |
1960 | */ | |
9115fbdc | 1961 | static |
a90917c3 | 1962 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1963 | { |
1964 | return lttng_metadata_printf(session, | |
1965 | "struct packet_context {\n" | |
a3ccff4f MD |
1966 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1967 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1968 | " uint64_t content_size;\n" |
1969 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 1970 | " uint64_t packet_seq_num;\n" |
a9afe705 | 1971 | " unsigned long events_discarded;\n" |
9115fbdc | 1972 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1973 | "};\n\n" |
9115fbdc MD |
1974 | ); |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * Compact header: | |
1979 | * id: range: 0 - 30. | |
1980 | * id 31 is reserved to indicate an extended header. | |
1981 | * | |
1982 | * Large header: | |
1983 | * id: range: 0 - 65534. | |
1984 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1985 | * |
1986 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1987 | */ |
1988 | static | |
a90917c3 | 1989 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1990 | { |
1991 | return lttng_metadata_printf(session, | |
1992 | "struct event_header_compact {\n" | |
1993 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1994 | " variant <id> {\n" | |
1995 | " struct {\n" | |
a3ccff4f | 1996 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1997 | " } compact;\n" |
1998 | " struct {\n" | |
1999 | " uint32_t id;\n" | |
a3ccff4f | 2000 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2001 | " } extended;\n" |
2002 | " } v;\n" | |
2003 | "} align(%u);\n" | |
2004 | "\n" | |
2005 | "struct event_header_large {\n" | |
2006 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2007 | " variant <id> {\n" | |
2008 | " struct {\n" | |
a3ccff4f | 2009 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2010 | " } compact;\n" |
2011 | " struct {\n" | |
2012 | " uint32_t id;\n" | |
a3ccff4f | 2013 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2014 | " } extended;\n" |
2015 | " } v;\n" | |
2016 | "} align(%u);\n\n", | |
a90917c3 MD |
2017 | lttng_alignof(uint32_t) * CHAR_BIT, |
2018 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2019 | ); |
2020 | } | |
2021 | ||
a3ccff4f MD |
2022 | /* |
2023 | * Approximation of NTP time of day to clock monotonic correlation, | |
2024 | * taken at start of trace. | |
2025 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2026 | * in future versions. | |
5283350b MD |
2027 | * This function may return a negative offset. It may happen if the |
2028 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2029 | */ |
2030 | static | |
8967b2a3 | 2031 | int64_t measure_clock_offset(void) |
a3ccff4f | 2032 | { |
dcb93448 | 2033 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2034 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2035 | int64_t offset; |
a3ccff4f MD |
2036 | struct timespec rts = { 0, 0 }; |
2037 | unsigned long flags; | |
2038 | ||
2039 | /* Disable interrupts to increase correlation precision. */ | |
2040 | local_irq_save(flags); | |
2041 | monotonic[0] = trace_clock_read64(); | |
2042 | getnstimeofday(&rts); | |
2043 | monotonic[1] = trace_clock_read64(); | |
2044 | local_irq_restore(flags); | |
2045 | ||
dcb93448 | 2046 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2047 | realtime = (uint64_t) rts.tv_sec * tcf; |
2048 | if (tcf == NSEC_PER_SEC) { | |
2049 | realtime += rts.tv_nsec; | |
2050 | } else { | |
2051 | uint64_t n = rts.tv_nsec * tcf; | |
2052 | ||
2053 | do_div(n, NSEC_PER_SEC); | |
2054 | realtime += n; | |
2055 | } | |
dcb93448 | 2056 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2057 | return offset; |
2058 | } | |
2059 | ||
c099397a MD |
2060 | /* |
2061 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2062 | * Must be called with sessions_mutex held. |
c099397a MD |
2063 | */ |
2064 | static | |
a90917c3 | 2065 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2066 | { |
30bdb6e4 | 2067 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2068 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2069 | struct lttng_channel *chan; |
2070 | struct lttng_event *event; | |
c099397a MD |
2071 | int ret = 0; |
2072 | ||
2073 | if (!ACCESS_ONCE(session->active)) | |
2074 | return 0; | |
2075 | if (session->metadata_dumped) | |
2076 | goto skip_session; | |
c099397a | 2077 | |
d793d5e1 | 2078 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2079 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2080 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2081 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2082 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2083 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2084 | |
2085 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2086 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2087 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2088 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2089 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2090 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2091 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2092 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2093 | "\n" |
2094 | "trace {\n" | |
2095 | " major = %u;\n" | |
2096 | " minor = %u;\n" | |
30bdb6e4 | 2097 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2098 | " byte_order = %s;\n" |
2099 | " packet.header := struct {\n" | |
2100 | " uint32_t magic;\n" | |
1ec3f75a | 2101 | " uint8_t uuid[16];\n" |
d793d5e1 | 2102 | " uint32_t stream_id;\n" |
5594698f | 2103 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2104 | " };\n" |
d793d5e1 | 2105 | "};\n\n", |
a90917c3 MD |
2106 | lttng_alignof(uint8_t) * CHAR_BIT, |
2107 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2108 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2109 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2110 | sizeof(unsigned long) * CHAR_BIT, |
2111 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2112 | CTF_SPEC_MAJOR, |
2113 | CTF_SPEC_MINOR, | |
d793d5e1 | 2114 | uuid_s, |
d669b02d | 2115 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2116 | "be" |
2117 | #else | |
2118 | "le" | |
2119 | #endif | |
2120 | ); | |
2121 | if (ret) | |
2122 | goto end; | |
2123 | ||
99dc9597 MD |
2124 | ret = lttng_metadata_printf(session, |
2125 | "env {\n" | |
a6058143 | 2126 | " hostname = \"%s\";\n" |
c6c9e10f | 2127 | " domain = \"kernel\";\n" |
99dc9597 | 2128 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2129 | " kernel_release = \"%s\";\n" |
2130 | " kernel_version = \"%s\";\n" | |
2131 | " tracer_name = \"lttng-modules\";\n" | |
2132 | " tracer_major = %d;\n" | |
2133 | " tracer_minor = %d;\n" | |
2134 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2135 | "};\n\n", |
3d0d43db | 2136 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2137 | utsname()->sysname, |
2138 | utsname()->release, | |
c6c9e10f MD |
2139 | utsname()->version, |
2140 | LTTNG_MODULES_MAJOR_VERSION, | |
2141 | LTTNG_MODULES_MINOR_VERSION, | |
2142 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2143 | ); |
2144 | if (ret) | |
2145 | goto end; | |
2146 | ||
a3ccff4f MD |
2147 | ret = lttng_metadata_printf(session, |
2148 | "clock {\n" | |
2754583e MD |
2149 | " name = \"%s\";\n", |
2150 | trace_clock_name() | |
a82c63f1 MD |
2151 | ); |
2152 | if (ret) | |
2153 | goto end; | |
2154 | ||
2155 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2156 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2157 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2158 | clock_uuid_s |
2159 | ); | |
2160 | if (ret) | |
2161 | goto end; | |
2162 | } | |
2163 | ||
2164 | ret = lttng_metadata_printf(session, | |
2754583e | 2165 | " description = \"%s\";\n" |
a3ccff4f MD |
2166 | " freq = %llu; /* Frequency, in Hz */\n" |
2167 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2168 | " offset = %lld;\n" |
a3ccff4f | 2169 | "};\n\n", |
2754583e | 2170 | trace_clock_description(), |
a3ccff4f | 2171 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2172 | (long long) measure_clock_offset() |
a3ccff4f MD |
2173 | ); |
2174 | if (ret) | |
2175 | goto end; | |
2176 | ||
2177 | ret = lttng_metadata_printf(session, | |
2178 | "typealias integer {\n" | |
2179 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2180 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2181 | "} := uint27_clock_monotonic_t;\n" |
2182 | "\n" | |
2183 | "typealias integer {\n" | |
2184 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2185 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2186 | "} := uint32_clock_monotonic_t;\n" |
2187 | "\n" | |
2188 | "typealias integer {\n" | |
2189 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2190 | " map = clock.%s.value;\n" |
a3ccff4f | 2191 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2192 | trace_clock_name(), |
a3ccff4f | 2193 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2194 | trace_clock_name(), |
2195 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2196 | trace_clock_name() | |
a3ccff4f MD |
2197 | ); |
2198 | if (ret) | |
2199 | goto end; | |
2200 | ||
a90917c3 | 2201 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2202 | if (ret) |
2203 | goto end; | |
2204 | ||
a90917c3 | 2205 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2206 | if (ret) |
2207 | goto end; | |
2208 | ||
c099397a MD |
2209 | skip_session: |
2210 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2211 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2212 | if (ret) |
2213 | goto end; | |
2214 | } | |
2215 | ||
2216 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2217 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2218 | if (ret) |
2219 | goto end; | |
2220 | } | |
2221 | session->metadata_dumped = 1; | |
2222 | end: | |
2223 | return ret; | |
2224 | } | |
2225 | ||
c0e31d2e | 2226 | /** |
a90917c3 | 2227 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2228 | * @transport: transport structure |
2229 | * | |
2230 | * Registers a transport which can be used as output to extract the data out of | |
2231 | * LTTng. The module calling this registration function must ensure that no | |
2232 | * trap-inducing code will be executed by the transport functions. E.g. | |
2233 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2234 | * is made visible to the transport function. This registration acts as a | |
2235 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2236 | * after its registration must it synchronize the TLBs. | |
2237 | */ | |
a90917c3 | 2238 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2239 | { |
2240 | /* | |
2241 | * Make sure no page fault can be triggered by the module about to be | |
2242 | * registered. We deal with this here so we don't have to call | |
2243 | * vmalloc_sync_all() in each module's init. | |
2244 | */ | |
6d2a620c | 2245 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2246 | |
2247 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2248 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2249 | mutex_unlock(&sessions_mutex); |
2250 | } | |
a90917c3 | 2251 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2252 | |
2253 | /** | |
a90917c3 | 2254 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2255 | * @transport: transport structure |
2256 | */ | |
a90917c3 | 2257 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2258 | { |
2259 | mutex_lock(&sessions_mutex); | |
2260 | list_del(&transport->node); | |
2261 | mutex_unlock(&sessions_mutex); | |
2262 | } | |
a90917c3 | 2263 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2264 | |
a90917c3 | 2265 | static int __init lttng_events_init(void) |
4e3c1b9b | 2266 | { |
1c25284c MD |
2267 | int ret; |
2268 | ||
453b2495 JD |
2269 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2270 | if (ret) | |
2271 | return ret; | |
389d7070 | 2272 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2273 | if (ret) |
2274 | return ret; | |
2275 | ret = wrapper_get_pageblock_flags_mask_init(); | |
389d7070 MD |
2276 | if (ret) |
2277 | return ret; | |
07dfc1d0 | 2278 | ret = lttng_context_init(); |
20591cf7 MD |
2279 | if (ret) |
2280 | return ret; | |
07dfc1d0 MD |
2281 | ret = lttng_tracepoint_init(); |
2282 | if (ret) | |
2283 | goto error_tp; | |
a90917c3 | 2284 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2285 | if (!event_cache) { |
2286 | ret = -ENOMEM; | |
2287 | goto error_kmem; | |
2288 | } | |
80996790 | 2289 | ret = lttng_abi_init(); |
02119ee5 MD |
2290 | if (ret) |
2291 | goto error_abi; | |
0c956676 MD |
2292 | ret = lttng_logger_init(); |
2293 | if (ret) | |
2294 | goto error_logger; | |
4e3c1b9b | 2295 | return 0; |
0c956676 MD |
2296 | |
2297 | error_logger: | |
2298 | lttng_abi_exit(); | |
02119ee5 | 2299 | error_abi: |
1c25284c | 2300 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2301 | error_kmem: |
2302 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2303 | error_tp: |
2304 | lttng_context_exit(); | |
1c25284c | 2305 | return ret; |
4e3c1b9b MD |
2306 | } |
2307 | ||
a90917c3 | 2308 | module_init(lttng_events_init); |
11b5a3c2 | 2309 | |
a90917c3 | 2310 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2311 | { |
a90917c3 | 2312 | struct lttng_session *session, *tmpsession; |
92e94819 | 2313 | |
0c956676 | 2314 | lttng_logger_exit(); |
80996790 | 2315 | lttng_abi_exit(); |
92e94819 | 2316 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2317 | lttng_session_destroy(session); |
11b5a3c2 | 2318 | kmem_cache_destroy(event_cache); |
20591cf7 | 2319 | lttng_tracepoint_exit(); |
07dfc1d0 | 2320 | lttng_context_exit(); |
4e3c1b9b | 2321 | } |
92e94819 | 2322 | |
a90917c3 | 2323 | module_exit(lttng_events_exit); |
11b5a3c2 | 2324 | |
92e94819 MD |
2325 | MODULE_LICENSE("GPL and additional rights"); |
2326 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2327 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2328 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2329 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2330 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2331 | LTTNG_MODULES_EXTRAVERSION); |