Commit | Line | Data |
---|---|---|
4e3c1b9b | 1 | /* |
a90917c3 | 2 | * lttng-events.c |
4e3c1b9b | 3 | * |
4e3c1b9b | 4 | * Holds LTTng per-session event registry. |
17baffe2 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
4e3c1b9b MD |
21 | */ |
22 | ||
389d7070 MD |
23 | /* |
24 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
25 | * overrides a function with a define. | |
26 | */ | |
27 | #include "wrapper/page_alloc.h" | |
28 | ||
4e3c1b9b | 29 | #include <linux/module.h> |
c0e31d2e MD |
30 | #include <linux/mutex.h> |
31 | #include <linux/sched.h> | |
11b5a3c2 | 32 | #include <linux/slab.h> |
c099397a | 33 | #include <linux/jiffies.h> |
99dc9597 | 34 | #include <linux/utsname.h> |
abc0446a | 35 | #include <linux/err.h> |
7e6f9ef6 MD |
36 | #include <linux/seq_file.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/anon_inodes.h> | |
241ae9a8 | 39 | #include <wrapper/file.h> |
3c997079 | 40 | #include <linux/jhash.h> |
8c6e7f13 | 41 | #include <linux/uaccess.h> |
a606b6e8 | 42 | #include <linux/vmalloc.h> |
3c997079 | 43 | |
241ae9a8 MD |
44 | #include <wrapper/uuid.h> |
45 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ | |
46 | #include <wrapper/random.h> | |
47 | #include <wrapper/tracepoint.h> | |
48 | #include <wrapper/list.h> | |
49 | #include <lttng-kernel-version.h> | |
50 | #include <lttng-events.h> | |
51 | #include <lttng-tracer.h> | |
52 | #include <lttng-abi-old.h> | |
5214fa50 | 53 | #include <lttng-endian.h> |
241ae9a8 | 54 | #include <wrapper/vzalloc.h> |
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); | |
f513b2bf MD |
81 | static |
82 | int _lttng_field_statedump(struct lttng_session *session, | |
83 | const struct lttng_event_field *field, | |
84 | size_t nesting); | |
c099397a | 85 | |
c099397a | 86 | void synchronize_trace(void) |
abcca994 MD |
87 | { |
88 | synchronize_sched(); | |
b8590f40 MD |
89 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
90 | #ifdef CONFIG_PREEMPT_RT_FULL | |
91 | synchronize_rcu(); | |
92 | #endif | |
93 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
94 | #ifdef CONFIG_PREEMPT_RT |
95 | synchronize_rcu(); | |
96 | #endif | |
b8590f40 | 97 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
98 | } |
99 | ||
3c997079 MD |
100 | void lttng_lock_sessions(void) |
101 | { | |
102 | mutex_lock(&sessions_mutex); | |
103 | } | |
104 | ||
105 | void lttng_unlock_sessions(void) | |
106 | { | |
107 | mutex_unlock(&sessions_mutex); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Called with sessions lock held. | |
112 | */ | |
113 | int lttng_session_active(void) | |
114 | { | |
115 | struct lttng_session *iter; | |
116 | ||
117 | list_for_each_entry(iter, &sessions, list) { | |
118 | if (iter->active) | |
119 | return 1; | |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
a90917c3 | 124 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 125 | { |
a90917c3 | 126 | struct lttng_session *session; |
d83004aa | 127 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 128 | int i; |
4e3c1b9b MD |
129 | |
130 | mutex_lock(&sessions_mutex); | |
a90917c3 | 131 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 132 | if (!session) |
d83004aa | 133 | goto err; |
4e3c1b9b | 134 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 135 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 136 | uuid_le_gen(&session->uuid); |
d83004aa JD |
137 | |
138 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
139 | GFP_KERNEL); | |
140 | if (!metadata_cache) | |
141 | goto err_free_session; | |
f6da044f | 142 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
143 | if (!metadata_cache->data) |
144 | goto err_free_cache; | |
145 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
146 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 147 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
148 | session->metadata_cache = metadata_cache; |
149 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
150 | memcpy(&metadata_cache->uuid, &session->uuid, |
151 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
152 | INIT_LIST_HEAD(&session->enablers_head); |
153 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
154 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
155 | list_add(&session->list, &sessions); |
156 | mutex_unlock(&sessions_mutex); | |
157 | return session; | |
d83004aa JD |
158 | |
159 | err_free_cache: | |
160 | kfree(metadata_cache); | |
161 | err_free_session: | |
162 | kfree(session); | |
163 | err: | |
164 | mutex_unlock(&sessions_mutex); | |
165 | return NULL; | |
166 | } | |
167 | ||
168 | void metadata_cache_destroy(struct kref *kref) | |
169 | { | |
170 | struct lttng_metadata_cache *cache = | |
171 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 172 | vfree(cache->data); |
d83004aa | 173 | kfree(cache); |
4e3c1b9b MD |
174 | } |
175 | ||
a90917c3 | 176 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 177 | { |
a90917c3 MD |
178 | struct lttng_channel *chan, *tmpchan; |
179 | struct lttng_event *event, *tmpevent; | |
d83004aa | 180 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 181 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 182 | int ret; |
4e3c1b9b MD |
183 | |
184 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 185 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
186 | list_for_each_entry(chan, &session->chan, list) { |
187 | ret = lttng_syscalls_unregister(chan); | |
188 | WARN_ON(ret); | |
189 | } | |
dda6a249 | 190 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 191 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
192 | WARN_ON(ret); |
193 | } | |
abcca994 | 194 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
195 | list_for_each_entry_safe(enabler, tmpenabler, |
196 | &session->enablers_head, node) | |
197 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 198 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 199 | _lttng_event_destroy(event); |
d83004aa JD |
200 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
201 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 202 | _lttng_channel_destroy(chan); |
d83004aa JD |
203 | } |
204 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
205 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
206 | if (session->pid_tracker) |
207 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 208 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
209 | list_del(&session->list); |
210 | mutex_unlock(&sessions_mutex); | |
211 | kfree(session); | |
212 | } | |
213 | ||
a90917c3 | 214 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
215 | { |
216 | int ret = 0; | |
a90917c3 | 217 | struct lttng_channel *chan; |
c0e31d2e MD |
218 | |
219 | mutex_lock(&sessions_mutex); | |
220 | if (session->active) { | |
221 | ret = -EBUSY; | |
222 | goto end; | |
223 | } | |
c099397a | 224 | |
3c997079 MD |
225 | /* Set transient enabler state to "enabled" */ |
226 | session->tstate = 1; | |
227 | ||
c099397a MD |
228 | /* |
229 | * Snapshot the number of events per channel to know the type of header | |
230 | * we need to use. | |
231 | */ | |
232 | list_for_each_entry(chan, &session->chan, list) { | |
233 | if (chan->header_type) | |
234 | continue; /* don't change it if session stop/restart */ | |
235 | if (chan->free_event_id < 31) | |
236 | chan->header_type = 1; /* compact */ | |
237 | else | |
238 | chan->header_type = 2; /* large */ | |
239 | } | |
240 | ||
3c997079 MD |
241 | /* We need to sync enablers with session before activation. */ |
242 | lttng_session_sync_enablers(session); | |
243 | ||
52fc2e1f | 244 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 245 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 246 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
247 | if (ret) { |
248 | ACCESS_ONCE(session->active) = 0; | |
249 | goto end; | |
250 | } | |
251 | ret = lttng_statedump_start(session); | |
360f38ea | 252 | if (ret) |
c099397a | 253 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
254 | end: |
255 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 256 | return ret; |
c0e31d2e MD |
257 | } |
258 | ||
a90917c3 | 259 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
260 | { |
261 | int ret = 0; | |
262 | ||
263 | mutex_lock(&sessions_mutex); | |
264 | if (!session->active) { | |
265 | ret = -EBUSY; | |
266 | goto end; | |
267 | } | |
52fc2e1f | 268 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
269 | |
270 | /* Set transient enabler state to "disabled" */ | |
271 | session->tstate = 0; | |
272 | lttng_session_sync_enablers(session); | |
c0e31d2e MD |
273 | end: |
274 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 275 | return ret; |
c0e31d2e MD |
276 | } |
277 | ||
9616f0bf JD |
278 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
279 | { | |
280 | int ret = 0; | |
281 | struct lttng_channel *chan; | |
282 | struct lttng_event *event; | |
283 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
284 | struct lttng_metadata_stream *stream; | |
285 | ||
286 | mutex_lock(&sessions_mutex); | |
287 | if (!session->active) { | |
288 | ret = -EBUSY; | |
289 | goto end; | |
290 | } | |
291 | ||
292 | mutex_lock(&cache->lock); | |
293 | memset(cache->data, 0, cache->cache_alloc); | |
294 | cache->metadata_written = 0; | |
295 | cache->version++; | |
296 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
297 | stream->metadata_out = 0; | |
298 | stream->metadata_in = 0; | |
299 | } | |
300 | mutex_unlock(&cache->lock); | |
301 | ||
302 | session->metadata_dumped = 0; | |
303 | list_for_each_entry(chan, &session->chan, list) { | |
304 | chan->metadata_dumped = 0; | |
305 | } | |
306 | ||
307 | list_for_each_entry(event, &session->events, list) { | |
308 | event->metadata_dumped = 0; | |
309 | } | |
310 | ||
311 | ret = _lttng_session_metadata_statedump(session); | |
312 | ||
313 | end: | |
314 | mutex_unlock(&sessions_mutex); | |
315 | return ret; | |
316 | } | |
317 | ||
318 | ||
319 | ||
a90917c3 | 320 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 321 | { |
3c997079 | 322 | int ret = 0; |
e64957da | 323 | |
3c997079 MD |
324 | mutex_lock(&sessions_mutex); |
325 | if (channel->channel_type == METADATA_CHANNEL) { | |
326 | ret = -EPERM; | |
327 | goto end; | |
328 | } | |
329 | if (channel->enabled) { | |
330 | ret = -EEXIST; | |
331 | goto end; | |
332 | } | |
333 | /* Set transient enabler state to "enabled" */ | |
334 | channel->tstate = 1; | |
335 | lttng_session_sync_enablers(channel->session); | |
336 | /* Set atomically the state to "enabled" */ | |
337 | ACCESS_ONCE(channel->enabled) = 1; | |
338 | end: | |
339 | mutex_unlock(&sessions_mutex); | |
340 | return ret; | |
e64957da MD |
341 | } |
342 | ||
a90917c3 | 343 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 344 | { |
3c997079 | 345 | int ret = 0; |
e64957da | 346 | |
3c997079 MD |
347 | mutex_lock(&sessions_mutex); |
348 | if (channel->channel_type == METADATA_CHANNEL) { | |
349 | ret = -EPERM; | |
350 | goto end; | |
351 | } | |
352 | if (!channel->enabled) { | |
353 | ret = -EEXIST; | |
354 | goto end; | |
355 | } | |
356 | /* Set atomically the state to "disabled" */ | |
357 | ACCESS_ONCE(channel->enabled) = 0; | |
358 | /* Set transient enabler state to "enabled" */ | |
359 | channel->tstate = 0; | |
360 | lttng_session_sync_enablers(channel->session); | |
361 | end: | |
362 | mutex_unlock(&sessions_mutex); | |
363 | return ret; | |
e64957da MD |
364 | } |
365 | ||
a90917c3 | 366 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 367 | { |
3c997079 | 368 | int ret = 0; |
e64957da | 369 | |
3c997079 MD |
370 | mutex_lock(&sessions_mutex); |
371 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
372 | ret = -EPERM; | |
373 | goto end; | |
374 | } | |
375 | if (event->enabled) { | |
376 | ret = -EEXIST; | |
377 | goto end; | |
378 | } | |
a0493bef MD |
379 | switch (event->instrumentation) { |
380 | case LTTNG_KERNEL_TRACEPOINT: | |
381 | case LTTNG_KERNEL_SYSCALL: | |
382 | ret = -EINVAL; | |
383 | break; | |
384 | case LTTNG_KERNEL_KPROBE: | |
385 | case LTTNG_KERNEL_FUNCTION: | |
386 | case LTTNG_KERNEL_NOOP: | |
387 | ACCESS_ONCE(event->enabled) = 1; | |
388 | break; | |
389 | case LTTNG_KERNEL_KRETPROBE: | |
390 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
391 | break; | |
392 | default: | |
393 | WARN_ON_ONCE(1); | |
394 | ret = -EINVAL; | |
395 | } | |
3c997079 MD |
396 | end: |
397 | mutex_unlock(&sessions_mutex); | |
398 | return ret; | |
e64957da MD |
399 | } |
400 | ||
a90917c3 | 401 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 402 | { |
3c997079 | 403 | int ret = 0; |
e64957da | 404 | |
3c997079 MD |
405 | mutex_lock(&sessions_mutex); |
406 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
407 | ret = -EPERM; | |
408 | goto end; | |
409 | } | |
410 | if (!event->enabled) { | |
411 | ret = -EEXIST; | |
412 | goto end; | |
413 | } | |
a0493bef MD |
414 | switch (event->instrumentation) { |
415 | case LTTNG_KERNEL_TRACEPOINT: | |
416 | case LTTNG_KERNEL_SYSCALL: | |
417 | ret = -EINVAL; | |
418 | break; | |
419 | case LTTNG_KERNEL_KPROBE: | |
420 | case LTTNG_KERNEL_FUNCTION: | |
421 | case LTTNG_KERNEL_NOOP: | |
422 | ACCESS_ONCE(event->enabled) = 0; | |
423 | break; | |
424 | case LTTNG_KERNEL_KRETPROBE: | |
425 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
426 | break; | |
427 | default: | |
428 | WARN_ON_ONCE(1); | |
429 | ret = -EINVAL; | |
430 | } | |
3c997079 MD |
431 | end: |
432 | mutex_unlock(&sessions_mutex); | |
433 | return ret; | |
e64957da MD |
434 | } |
435 | ||
a90917c3 | 436 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 437 | { |
a90917c3 | 438 | struct lttng_transport *transport; |
f3d01b96 | 439 | |
a90917c3 | 440 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
441 | if (!strcmp(transport->name, name)) |
442 | return transport; | |
443 | } | |
444 | return NULL; | |
445 | } | |
446 | ||
a90917c3 | 447 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
448 | const char *transport_name, |
449 | void *buf_addr, | |
4e3c1b9b MD |
450 | size_t subbuf_size, size_t num_subbuf, |
451 | unsigned int switch_timer_interval, | |
d83004aa JD |
452 | unsigned int read_timer_interval, |
453 | enum channel_type channel_type) | |
4e3c1b9b | 454 | { |
a90917c3 MD |
455 | struct lttng_channel *chan; |
456 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
457 | |
458 | mutex_lock(&sessions_mutex); | |
d83004aa | 459 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 460 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 461 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
462 | if (!transport) { |
463 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
464 | transport_name); | |
c0e31d2e | 465 | goto notransport; |
f3d01b96 | 466 | } |
a33c9927 MD |
467 | if (!try_module_get(transport->owner)) { |
468 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
469 | goto notransport; | |
470 | } | |
a90917c3 | 471 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 472 | if (!chan) |
c0e31d2e | 473 | goto nomem; |
4e3c1b9b | 474 | chan->session = session; |
05d32c64 | 475 | chan->id = session->free_chan_id++; |
3b731ab1 | 476 | chan->ops = &transport->ops; |
125b4df4 MD |
477 | /* |
478 | * Note: the channel creation op already writes into the packet | |
479 | * headers. Therefore the "chan" information used as input | |
480 | * should be already accessible. | |
481 | */ | |
5f5ddf01 MD |
482 | chan->chan = transport->ops.channel_create(transport_name, |
483 | chan, buf_addr, subbuf_size, num_subbuf, | |
484 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
485 | if (!chan->chan) |
486 | goto create_error; | |
3c997079 | 487 | chan->tstate = 1; |
e64957da | 488 | chan->enabled = 1; |
a33c9927 | 489 | chan->transport = transport; |
d83004aa | 490 | chan->channel_type = channel_type; |
4e3c1b9b MD |
491 | list_add(&chan->list, &session->chan); |
492 | mutex_unlock(&sessions_mutex); | |
493 | return chan; | |
494 | ||
f3d01b96 MD |
495 | create_error: |
496 | kfree(chan); | |
c0e31d2e | 497 | nomem: |
a33c9927 MD |
498 | if (transport) |
499 | module_put(transport->owner); | |
c0e31d2e | 500 | notransport: |
e5382b6d | 501 | active: |
4e3c1b9b MD |
502 | mutex_unlock(&sessions_mutex); |
503 | return NULL; | |
504 | } | |
505 | ||
506 | /* | |
d83004aa JD |
507 | * Only used internally at session destruction for per-cpu channels, and |
508 | * when metadata channel is released. | |
509 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 510 | */ |
aa7c23a9 | 511 | static |
a90917c3 | 512 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 513 | { |
11b5a3c2 | 514 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 515 | module_put(chan->transport->owner); |
4e3c1b9b | 516 | list_del(&chan->list); |
8070f5c0 | 517 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
518 | kfree(chan); |
519 | } | |
520 | ||
d83004aa JD |
521 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
522 | { | |
523 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
524 | ||
525 | /* Protect the metadata cache with the sessions_mutex. */ | |
526 | mutex_lock(&sessions_mutex); | |
527 | _lttng_channel_destroy(chan); | |
528 | mutex_unlock(&sessions_mutex); | |
529 | } | |
530 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
531 | ||
532 | static | |
533 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
534 | { | |
535 | stream->finalized = 1; | |
536 | wake_up_interruptible(&stream->read_wait); | |
537 | } | |
538 | ||
e5382b6d MD |
539 | /* |
540 | * Supports event creation while tracing session is active. | |
3c997079 | 541 | * Needs to be called with sessions mutex held. |
e5382b6d | 542 | */ |
3c997079 MD |
543 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
544 | struct lttng_kernel_event *event_param, | |
545 | void *filter, | |
546 | const struct lttng_event_desc *event_desc, | |
547 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 548 | { |
3c997079 | 549 | struct lttng_session *session = chan->session; |
a90917c3 | 550 | struct lttng_event *event; |
3c997079 MD |
551 | const char *event_name; |
552 | struct hlist_head *head; | |
553 | size_t name_len; | |
554 | uint32_t hash; | |
3d084699 | 555 | int ret; |
4e3c1b9b | 556 | |
abc0446a | 557 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 558 | ret = -EMFILE; |
e5382b6d | 559 | goto full; |
abc0446a | 560 | } |
3c997079 MD |
561 | |
562 | switch (itype) { | |
563 | case LTTNG_KERNEL_TRACEPOINT: | |
564 | event_name = event_desc->name; | |
565 | break; | |
566 | case LTTNG_KERNEL_KPROBE: | |
567 | case LTTNG_KERNEL_KRETPROBE: | |
568 | case LTTNG_KERNEL_FUNCTION: | |
569 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 570 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
571 | event_name = event_param->name; |
572 | break; | |
573 | default: | |
574 | WARN_ON_ONCE(1); | |
575 | ret = -EINVAL; | |
576 | goto type_error; | |
577 | } | |
578 | name_len = strlen(event_name); | |
579 | hash = jhash(event_name, name_len, 0); | |
580 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 581 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
582 | WARN_ON_ONCE(!event->desc); |
583 | if (!strncmp(event->desc->name, event_name, | |
584 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
585 | && chan == event->chan) { | |
586 | ret = -EEXIST; | |
587 | goto exist; | |
abc0446a MD |
588 | } |
589 | } | |
3c997079 | 590 | |
11b5a3c2 | 591 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 592 | if (!event) { |
4cf0bf51 | 593 | ret = -ENOMEM; |
4e3c1b9b | 594 | goto cache_error; |
abc0446a | 595 | } |
4e3c1b9b MD |
596 | event->chan = chan; |
597 | event->filter = filter; | |
e5382b6d | 598 | event->id = chan->free_event_id++; |
3c997079 MD |
599 | event->instrumentation = itype; |
600 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 601 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
602 | INIT_LIST_HEAD(&event->enablers_ref_head); |
603 | ||
604 | switch (itype) { | |
ab2277d6 | 605 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
606 | /* Event will be enabled by enabler sync. */ |
607 | event->enabled = 0; | |
608 | event->registered = 0; | |
609 | event->desc = lttng_event_get(event_name); | |
abc0446a | 610 | if (!event->desc) { |
4cf0bf51 | 611 | ret = -ENOENT; |
d3dbe23c | 612 | goto register_error; |
abc0446a | 613 | } |
3c997079 MD |
614 | /* Populate lttng_event structure before event registration. */ |
615 | smp_wmb(); | |
baf20995 | 616 | break; |
ab2277d6 | 617 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
618 | /* |
619 | * Needs to be explicitly enabled after creation, since | |
620 | * we may want to apply filters. | |
621 | */ | |
622 | event->enabled = 0; | |
3c997079 MD |
623 | event->registered = 1; |
624 | /* | |
625 | * Populate lttng_event structure before event | |
626 | * registration. | |
627 | */ | |
628 | smp_wmb(); | |
629 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
630 | event_param->u.kprobe.symbol_name, |
631 | event_param->u.kprobe.offset, | |
632 | event_param->u.kprobe.addr, | |
633 | event); | |
abc0446a | 634 | if (ret) { |
4cf0bf51 | 635 | ret = -EINVAL; |
d6d808f3 | 636 | goto register_error; |
abc0446a | 637 | } |
edeb3137 MD |
638 | ret = try_module_get(event->desc->owner); |
639 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 640 | break; |
7371f44c MD |
641 | case LTTNG_KERNEL_KRETPROBE: |
642 | { | |
a90917c3 | 643 | struct lttng_event *event_return; |
7371f44c MD |
644 | |
645 | /* kretprobe defines 2 events */ | |
a0493bef MD |
646 | /* |
647 | * Needs to be explicitly enabled after creation, since | |
648 | * we may want to apply filters. | |
649 | */ | |
650 | event->enabled = 0; | |
3c997079 | 651 | event->registered = 1; |
7371f44c MD |
652 | event_return = |
653 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 654 | if (!event_return) { |
4cf0bf51 | 655 | ret = -ENOMEM; |
7371f44c | 656 | goto register_error; |
abc0446a | 657 | } |
7371f44c MD |
658 | event_return->chan = chan; |
659 | event_return->filter = filter; | |
660 | event_return->id = chan->free_event_id++; | |
a0493bef | 661 | event_return->enabled = 0; |
3c997079 MD |
662 | event_return->registered = 1; |
663 | event_return->instrumentation = itype; | |
7371f44c | 664 | /* |
a90917c3 | 665 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
666 | */ |
667 | smp_wmb(); | |
3c997079 | 668 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
669 | event_param->u.kretprobe.symbol_name, |
670 | event_param->u.kretprobe.offset, | |
671 | event_param->u.kretprobe.addr, | |
672 | event, event_return); | |
673 | if (ret) { | |
674 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 675 | ret = -EINVAL; |
7371f44c MD |
676 | goto register_error; |
677 | } | |
678 | /* Take 2 refs on the module: one per event. */ | |
679 | ret = try_module_get(event->desc->owner); | |
680 | WARN_ON_ONCE(!ret); | |
681 | ret = try_module_get(event->desc->owner); | |
682 | WARN_ON_ONCE(!ret); | |
a90917c3 | 683 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 684 | event_return); |
abc0446a | 685 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
686 | if (ret) { |
687 | kmem_cache_free(event_cache, event_return); | |
688 | module_put(event->desc->owner); | |
689 | module_put(event->desc->owner); | |
690 | goto statedump_error; | |
691 | } | |
692 | list_add(&event_return->list, &chan->session->events); | |
693 | break; | |
694 | } | |
ab2277d6 | 695 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
696 | /* |
697 | * Needs to be explicitly enabled after creation, since | |
698 | * we may want to apply filters. | |
699 | */ | |
700 | event->enabled = 0; | |
3c997079 MD |
701 | event->registered = 1; |
702 | /* | |
703 | * Populate lttng_event structure before event | |
704 | * registration. | |
705 | */ | |
706 | smp_wmb(); | |
707 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
708 | event_param->u.ftrace.symbol_name, |
709 | event); | |
abc0446a | 710 | if (ret) { |
e0a7a7c4 | 711 | goto register_error; |
abc0446a | 712 | } |
edeb3137 MD |
713 | ret = try_module_get(event->desc->owner); |
714 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 715 | break; |
1ec65de1 | 716 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 717 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
718 | /* |
719 | * Needs to be explicitly enabled after creation, since | |
720 | * we may want to apply filters. | |
721 | */ | |
722 | event->enabled = 0; | |
3c997079 MD |
723 | event->registered = 0; |
724 | event->desc = event_desc; | |
abc0446a | 725 | if (!event->desc) { |
4cf0bf51 | 726 | ret = -EINVAL; |
259b6cb3 | 727 | goto register_error; |
abc0446a | 728 | } |
1ec65de1 | 729 | break; |
baf20995 MD |
730 | default: |
731 | WARN_ON_ONCE(1); | |
4cf0bf51 | 732 | ret = -EINVAL; |
df07930b | 733 | goto register_error; |
baf20995 | 734 | } |
a90917c3 | 735 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
736 | WARN_ON_ONCE(ret > 0); |
737 | if (ret) { | |
c099397a | 738 | goto statedump_error; |
abc0446a | 739 | } |
3c997079 | 740 | hlist_add_head(&event->hlist, head); |
dda6a249 | 741 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
742 | return event; |
743 | ||
c099397a | 744 | statedump_error: |
259b6cb3 | 745 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 746 | register_error: |
11b5a3c2 | 747 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
748 | cache_error: |
749 | exist: | |
3c997079 | 750 | type_error: |
e5382b6d | 751 | full: |
4cf0bf51 | 752 | return ERR_PTR(ret); |
4e3c1b9b MD |
753 | } |
754 | ||
3c997079 MD |
755 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
756 | struct lttng_kernel_event *event_param, | |
757 | void *filter, | |
758 | const struct lttng_event_desc *event_desc, | |
759 | enum lttng_kernel_instrumentation itype) | |
760 | { | |
761 | struct lttng_event *event; | |
762 | ||
763 | mutex_lock(&sessions_mutex); | |
764 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
765 | itype); | |
766 | mutex_unlock(&sessions_mutex); | |
767 | return event; | |
768 | } | |
769 | ||
770 | /* Only used for tracepoints for now. */ | |
771 | static | |
772 | void register_event(struct lttng_event *event) | |
773 | { | |
774 | const struct lttng_event_desc *desc; | |
f127e61e | 775 | int ret = -EINVAL; |
3c997079 | 776 | |
3c997079 MD |
777 | if (event->registered) |
778 | return; | |
4ecb5ad5 | 779 | |
3c997079 | 780 | desc = event->desc; |
4ecb5ad5 MD |
781 | switch (event->instrumentation) { |
782 | case LTTNG_KERNEL_TRACEPOINT: | |
783 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
784 | desc->probe_callback, | |
785 | event); | |
786 | break; | |
787 | case LTTNG_KERNEL_SYSCALL: | |
788 | ret = lttng_syscall_filter_enable(event->chan, | |
789 | desc->name); | |
790 | break; | |
791 | case LTTNG_KERNEL_KPROBE: | |
792 | case LTTNG_KERNEL_KRETPROBE: | |
793 | case LTTNG_KERNEL_FUNCTION: | |
794 | case LTTNG_KERNEL_NOOP: | |
795 | ret = 0; | |
796 | break; | |
797 | default: | |
798 | WARN_ON_ONCE(1); | |
799 | } | |
3c997079 MD |
800 | if (!ret) |
801 | event->registered = 1; | |
802 | } | |
803 | ||
4e3c1b9b MD |
804 | /* |
805 | * Only used internally at session destruction. | |
806 | */ | |
a90917c3 | 807 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 808 | { |
4ecb5ad5 | 809 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
810 | int ret = -EINVAL; |
811 | ||
3c997079 MD |
812 | if (!event->registered) |
813 | return 0; | |
814 | ||
4ecb5ad5 | 815 | desc = event->desc; |
38d024ae | 816 | switch (event->instrumentation) { |
ab2277d6 | 817 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 818 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 819 | event->desc->probe_callback, |
11b5a3c2 | 820 | event); |
baf20995 | 821 | break; |
ab2277d6 | 822 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 823 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
824 | ret = 0; |
825 | break; | |
7371f44c MD |
826 | case LTTNG_KERNEL_KRETPROBE: |
827 | lttng_kretprobes_unregister(event); | |
828 | ret = 0; | |
829 | break; | |
ab2277d6 | 830 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
831 | lttng_ftrace_unregister(event); |
832 | ret = 0; | |
833 | break; | |
33a39a3c | 834 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
835 | ret = lttng_syscall_filter_disable(event->chan, |
836 | desc->name); | |
837 | break; | |
838 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
839 | ret = 0; |
840 | break; | |
baf20995 MD |
841 | default: |
842 | WARN_ON_ONCE(1); | |
843 | } | |
3c997079 MD |
844 | if (!ret) |
845 | event->registered = 0; | |
dda6a249 MD |
846 | return ret; |
847 | } | |
848 | ||
849 | /* | |
850 | * Only used internally at session destruction. | |
851 | */ | |
be066e6c | 852 | static |
a90917c3 | 853 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 854 | { |
edeb3137 MD |
855 | switch (event->instrumentation) { |
856 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 857 | lttng_event_put(event->desc); |
edeb3137 MD |
858 | break; |
859 | case LTTNG_KERNEL_KPROBE: | |
860 | module_put(event->desc->owner); | |
861 | lttng_kprobes_destroy_private(event); | |
862 | break; | |
7371f44c MD |
863 | case LTTNG_KERNEL_KRETPROBE: |
864 | module_put(event->desc->owner); | |
865 | lttng_kretprobes_destroy_private(event); | |
866 | break; | |
edeb3137 MD |
867 | case LTTNG_KERNEL_FUNCTION: |
868 | module_put(event->desc->owner); | |
869 | lttng_ftrace_destroy_private(event); | |
870 | break; | |
259b6cb3 | 871 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 872 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 873 | break; |
edeb3137 MD |
874 | default: |
875 | WARN_ON_ONCE(1); | |
876 | } | |
dda6a249 | 877 | list_del(&event->list); |
8070f5c0 | 878 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 879 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
880 | } |
881 | ||
e0130fab MD |
882 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
883 | { | |
884 | int ret; | |
885 | ||
886 | if (pid < -1) | |
887 | return -EINVAL; | |
888 | mutex_lock(&sessions_mutex); | |
889 | if (pid == -1) { | |
890 | /* track all pids: destroy tracker. */ | |
891 | if (session->pid_tracker) { | |
892 | struct lttng_pid_tracker *lpf; | |
893 | ||
894 | lpf = session->pid_tracker; | |
895 | rcu_assign_pointer(session->pid_tracker, NULL); | |
896 | synchronize_trace(); | |
897 | lttng_pid_tracker_destroy(lpf); | |
898 | } | |
899 | ret = 0; | |
900 | } else { | |
901 | if (!session->pid_tracker) { | |
902 | struct lttng_pid_tracker *lpf; | |
903 | ||
904 | lpf = lttng_pid_tracker_create(); | |
905 | if (!lpf) { | |
906 | ret = -ENOMEM; | |
907 | goto unlock; | |
908 | } | |
909 | ret = lttng_pid_tracker_add(lpf, pid); | |
910 | rcu_assign_pointer(session->pid_tracker, lpf); | |
911 | } else { | |
912 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
913 | } | |
914 | } | |
915 | unlock: | |
916 | mutex_unlock(&sessions_mutex); | |
917 | return ret; | |
918 | } | |
919 | ||
920 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
921 | { | |
922 | int ret; | |
923 | ||
924 | if (pid < -1) | |
925 | return -EINVAL; | |
926 | mutex_lock(&sessions_mutex); | |
927 | if (pid == -1) { | |
928 | /* untrack all pids: replace by empty tracker. */ | |
929 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
930 | struct lttng_pid_tracker *lpf; | |
931 | ||
932 | lpf = lttng_pid_tracker_create(); | |
933 | if (!lpf) { | |
934 | ret = -ENOMEM; | |
935 | goto unlock; | |
936 | } | |
937 | rcu_assign_pointer(session->pid_tracker, lpf); | |
938 | synchronize_trace(); | |
939 | if (old_lpf) | |
940 | lttng_pid_tracker_destroy(old_lpf); | |
941 | ret = 0; | |
942 | } else { | |
943 | if (!session->pid_tracker) { | |
944 | ret = -ENOENT; | |
945 | goto unlock; | |
946 | } | |
947 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
948 | } | |
949 | unlock: | |
950 | mutex_unlock(&sessions_mutex); | |
951 | return ret; | |
952 | } | |
953 | ||
7e6f9ef6 MD |
954 | static |
955 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
956 | { | |
957 | struct lttng_session *session = m->private; | |
958 | struct lttng_pid_tracker *lpf; | |
959 | struct lttng_pid_hash_node *e; | |
960 | int iter = 0, i; | |
961 | ||
962 | mutex_lock(&sessions_mutex); | |
963 | lpf = session->pid_tracker; | |
964 | if (lpf) { | |
965 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
966 | struct hlist_head *head = &lpf->pid_hash[i]; | |
967 | ||
f934e302 | 968 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
969 | if (iter++ >= *pos) |
970 | return e; | |
971 | } | |
972 | } | |
973 | } else { | |
974 | /* PID tracker disabled. */ | |
975 | if (iter >= *pos && iter == 0) { | |
976 | return session; /* empty tracker */ | |
977 | } | |
978 | iter++; | |
979 | } | |
980 | /* End of list */ | |
981 | return NULL; | |
982 | } | |
983 | ||
984 | /* Called with sessions_mutex held. */ | |
985 | static | |
986 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
987 | { | |
988 | struct lttng_session *session = m->private; | |
989 | struct lttng_pid_tracker *lpf; | |
990 | struct lttng_pid_hash_node *e; | |
991 | int iter = 0, i; | |
992 | ||
993 | (*ppos)++; | |
994 | lpf = session->pid_tracker; | |
995 | if (lpf) { | |
996 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
997 | struct hlist_head *head = &lpf->pid_hash[i]; | |
998 | ||
f934e302 | 999 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1000 | if (iter++ >= *ppos) |
1001 | return e; | |
1002 | } | |
1003 | } | |
1004 | } else { | |
1005 | /* PID tracker disabled. */ | |
1006 | if (iter >= *ppos && iter == 0) | |
1007 | return session; /* empty tracker */ | |
1008 | iter++; | |
1009 | } | |
1010 | ||
1011 | /* End of list */ | |
1012 | return NULL; | |
1013 | } | |
1014 | ||
1015 | static | |
1016 | void pid_list_stop(struct seq_file *m, void *p) | |
1017 | { | |
1018 | mutex_unlock(&sessions_mutex); | |
1019 | } | |
1020 | ||
1021 | static | |
1022 | int pid_list_show(struct seq_file *m, void *p) | |
1023 | { | |
1024 | int pid; | |
1025 | ||
1026 | if (p == m->private) { | |
1027 | /* Tracker disabled. */ | |
1028 | pid = -1; | |
1029 | } else { | |
1030 | const struct lttng_pid_hash_node *e = p; | |
1031 | ||
1032 | pid = lttng_pid_tracker_get_node_pid(e); | |
1033 | } | |
1034 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static | |
1039 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1040 | .start = pid_list_start, | |
1041 | .next = pid_list_next, | |
1042 | .stop = pid_list_stop, | |
1043 | .show = pid_list_show, | |
1044 | }; | |
1045 | ||
1046 | static | |
1047 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1048 | { | |
1049 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1050 | } | |
1051 | ||
1052 | static | |
1053 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1054 | { | |
1055 | struct seq_file *m = file->private_data; | |
1056 | struct lttng_session *session = m->private; | |
1057 | int ret; | |
1058 | ||
1059 | WARN_ON_ONCE(!session); | |
1060 | ret = seq_release(inode, file); | |
1061 | if (!ret && session) | |
1062 | fput(session->file); | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1067 | .owner = THIS_MODULE, | |
1068 | .open = lttng_tracker_pids_list_open, | |
1069 | .read = seq_read, | |
1070 | .llseek = seq_lseek, | |
1071 | .release = lttng_tracker_pids_list_release, | |
1072 | }; | |
1073 | ||
1074 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1075 | { | |
1076 | struct file *tracker_pids_list_file; | |
1077 | struct seq_file *m; | |
1078 | int file_fd, ret; | |
1079 | ||
1080 | file_fd = lttng_get_unused_fd(); | |
1081 | if (file_fd < 0) { | |
1082 | ret = file_fd; | |
1083 | goto fd_error; | |
1084 | } | |
1085 | ||
1086 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1087 | <tng_tracker_pids_list_fops, | |
1088 | NULL, O_RDWR); | |
1089 | if (IS_ERR(tracker_pids_list_file)) { | |
1090 | ret = PTR_ERR(tracker_pids_list_file); | |
1091 | goto file_error; | |
1092 | } | |
9c1f4643 MD |
1093 | if (atomic_long_add_unless(&session->file->f_count, |
1094 | 1, INT_MAX) == INT_MAX) { | |
1095 | goto refcount_error; | |
1096 | } | |
7e6f9ef6 MD |
1097 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1098 | if (ret < 0) | |
1099 | goto open_error; | |
1100 | m = tracker_pids_list_file->private_data; | |
1101 | m->private = session; | |
1102 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1103 | |
1104 | return file_fd; | |
1105 | ||
1106 | open_error: | |
9c1f4643 MD |
1107 | atomic_long_dec(&session->file->f_count); |
1108 | refcount_error: | |
7e6f9ef6 MD |
1109 | fput(tracker_pids_list_file); |
1110 | file_error: | |
1111 | put_unused_fd(file_fd); | |
1112 | fd_error: | |
1113 | return ret; | |
1114 | } | |
1115 | ||
3c997079 MD |
1116 | /* |
1117 | * Enabler management. | |
1118 | */ | |
1119 | static | |
4ecb5ad5 MD |
1120 | int lttng_match_enabler_wildcard(const char *desc_name, |
1121 | const char *name) | |
3c997079 | 1122 | { |
3c997079 | 1123 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1124 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1125 | return 0; |
1126 | return 1; | |
1127 | } | |
1128 | ||
1129 | static | |
4ecb5ad5 MD |
1130 | int lttng_match_enabler_name(const char *desc_name, |
1131 | const char *name) | |
3c997079 | 1132 | { |
4ecb5ad5 | 1133 | if (strcmp(desc_name, name)) |
3c997079 MD |
1134 | return 0; |
1135 | return 1; | |
1136 | } | |
1137 | ||
1138 | static | |
1139 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1140 | struct lttng_enabler *enabler) | |
1141 | { | |
4ecb5ad5 MD |
1142 | const char *desc_name, *enabler_name; |
1143 | ||
1144 | enabler_name = enabler->event_param.name; | |
1145 | switch (enabler->event_param.instrumentation) { | |
1146 | case LTTNG_KERNEL_TRACEPOINT: | |
1147 | desc_name = desc->name; | |
1148 | break; | |
1149 | case LTTNG_KERNEL_SYSCALL: | |
1150 | desc_name = desc->name; | |
1151 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1152 | desc_name += strlen("compat_"); | |
1153 | if (!strncmp(desc_name, "syscall_exit_", | |
1154 | strlen("syscall_exit_"))) { | |
1155 | desc_name += strlen("syscall_exit_"); | |
1156 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1157 | strlen("syscall_entry_"))) { | |
1158 | desc_name += strlen("syscall_entry_"); | |
1159 | } else { | |
1160 | WARN_ON_ONCE(1); | |
1161 | return -EINVAL; | |
1162 | } | |
1163 | break; | |
1164 | default: | |
1165 | WARN_ON_ONCE(1); | |
1166 | return -EINVAL; | |
1167 | } | |
3c997079 MD |
1168 | switch (enabler->type) { |
1169 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1170 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1171 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1172 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1173 | default: |
1174 | return -EINVAL; | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | static | |
1179 | int lttng_event_match_enabler(struct lttng_event *event, | |
1180 | struct lttng_enabler *enabler) | |
1181 | { | |
33a39a3c MD |
1182 | if (enabler->event_param.instrumentation != event->instrumentation) |
1183 | return 0; | |
3c997079 MD |
1184 | if (lttng_desc_match_enabler(event->desc, enabler) |
1185 | && event->chan == enabler->chan) | |
1186 | return 1; | |
1187 | else | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | static | |
1192 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1193 | struct lttng_enabler *enabler) | |
1194 | { | |
1195 | struct lttng_enabler_ref *enabler_ref; | |
1196 | ||
1197 | list_for_each_entry(enabler_ref, | |
1198 | &event->enablers_ref_head, node) { | |
1199 | if (enabler_ref->ref == enabler) | |
1200 | return enabler_ref; | |
1201 | } | |
1202 | return NULL; | |
1203 | } | |
1204 | ||
3c997079 | 1205 | static |
33a39a3c | 1206 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1207 | { |
1208 | struct lttng_session *session = enabler->chan->session; | |
1209 | struct lttng_probe_desc *probe_desc; | |
1210 | const struct lttng_event_desc *desc; | |
1211 | int i; | |
1212 | struct list_head *probe_list; | |
1213 | ||
1214 | probe_list = lttng_get_probe_list_head(); | |
1215 | /* | |
1216 | * For each probe event, if we find that a probe event matches | |
1217 | * our enabler, create an associated lttng_event if not | |
1218 | * already present. | |
1219 | */ | |
1220 | list_for_each_entry(probe_desc, probe_list, head) { | |
1221 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1222 | int found = 0; | |
1223 | struct hlist_head *head; | |
1224 | const char *event_name; | |
1225 | size_t name_len; | |
1226 | uint32_t hash; | |
1227 | struct lttng_event *event; | |
1228 | ||
1229 | desc = probe_desc->event_desc[i]; | |
1230 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1231 | continue; | |
1232 | event_name = desc->name; | |
1233 | name_len = strlen(event_name); | |
1234 | ||
1235 | /* | |
1236 | * Check if already created. | |
1237 | */ | |
1238 | hash = jhash(event_name, name_len, 0); | |
1239 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1240 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1241 | if (event->desc == desc |
1242 | && event->chan == enabler->chan) | |
1243 | found = 1; | |
1244 | } | |
1245 | if (found) | |
1246 | continue; | |
1247 | ||
1248 | /* | |
1249 | * We need to create an event for this | |
1250 | * event probe. | |
1251 | */ | |
1252 | event = _lttng_event_create(enabler->chan, | |
1253 | NULL, NULL, desc, | |
1254 | LTTNG_KERNEL_TRACEPOINT); | |
1255 | if (!event) { | |
1256 | printk(KERN_INFO "Unable to create event %s\n", | |
1257 | probe_desc->event_desc[i]->name); | |
1258 | } | |
1259 | } | |
1260 | } | |
1261 | } | |
1262 | ||
33a39a3c MD |
1263 | static |
1264 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1265 | { | |
1266 | int ret; | |
1267 | ||
1268 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1269 | WARN_ON_ONCE(ret); | |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * Create struct lttng_event if it is missing and present in the list of | |
1274 | * tracepoint probes. | |
1275 | * Should be called with sessions mutex held. | |
1276 | */ | |
1277 | static | |
1278 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1279 | { | |
1280 | switch (enabler->event_param.instrumentation) { | |
1281 | case LTTNG_KERNEL_TRACEPOINT: | |
1282 | lttng_create_tracepoint_if_missing(enabler); | |
1283 | break; | |
1284 | case LTTNG_KERNEL_SYSCALL: | |
1285 | lttng_create_syscall_if_missing(enabler); | |
1286 | break; | |
1287 | default: | |
1288 | WARN_ON_ONCE(1); | |
1289 | break; | |
1290 | } | |
1291 | } | |
1292 | ||
3c997079 MD |
1293 | /* |
1294 | * Create events associated with an enabler (if not already present), | |
1295 | * and add backward reference from the event to the enabler. | |
1296 | * Should be called with sessions mutex held. | |
1297 | */ | |
1298 | static | |
1299 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1300 | { | |
1301 | struct lttng_session *session = enabler->chan->session; | |
1302 | struct lttng_event *event; | |
1303 | ||
1304 | /* First ensure that probe events are created for this enabler. */ | |
1305 | lttng_create_event_if_missing(enabler); | |
1306 | ||
1307 | /* For each event matching enabler in session event list. */ | |
1308 | list_for_each_entry(event, &session->events, list) { | |
1309 | struct lttng_enabler_ref *enabler_ref; | |
1310 | ||
1311 | if (!lttng_event_match_enabler(event, enabler)) | |
1312 | continue; | |
1313 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1314 | if (!enabler_ref) { | |
1315 | /* | |
1316 | * If no backward ref, create it. | |
1317 | * Add backward ref from event to enabler. | |
1318 | */ | |
1319 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1320 | if (!enabler_ref) | |
1321 | return -ENOMEM; | |
1322 | enabler_ref->ref = enabler; | |
1323 | list_add(&enabler_ref->node, | |
1324 | &event->enablers_ref_head); | |
1325 | } | |
1326 | ||
f127e61e MD |
1327 | /* |
1328 | * Link filter bytecodes if not linked yet. | |
1329 | */ | |
1330 | lttng_enabler_event_link_bytecode(event, enabler); | |
1331 | ||
3c997079 MD |
1332 | /* TODO: merge event context. */ |
1333 | } | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | /* | |
1338 | * Called at module load: connect the probe on all enablers matching | |
1339 | * this event. | |
1340 | * Called with sessions lock held. | |
1341 | */ | |
1342 | int lttng_fix_pending_events(void) | |
1343 | { | |
1344 | struct lttng_session *session; | |
1345 | ||
1346 | list_for_each_entry(session, &sessions, list) | |
1347 | lttng_session_lazy_sync_enablers(session); | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1352 | struct lttng_kernel_event *event_param, | |
1353 | struct lttng_channel *chan) | |
1354 | { | |
1355 | struct lttng_enabler *enabler; | |
1356 | ||
1357 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1358 | if (!enabler) | |
1359 | return NULL; | |
1360 | enabler->type = type; | |
07dfc1d0 | 1361 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1362 | memcpy(&enabler->event_param, event_param, |
1363 | sizeof(enabler->event_param)); | |
1364 | enabler->chan = chan; | |
1365 | /* ctx left NULL */ | |
4fd19d8a | 1366 | enabler->enabled = 0; |
3c997079 MD |
1367 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1368 | mutex_lock(&sessions_mutex); | |
1369 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1370 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1371 | mutex_unlock(&sessions_mutex); | |
1372 | return enabler; | |
1373 | } | |
1374 | ||
1375 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1376 | { | |
1377 | mutex_lock(&sessions_mutex); | |
1378 | enabler->enabled = 1; | |
1379 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1380 | mutex_unlock(&sessions_mutex); | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1385 | { | |
1386 | mutex_lock(&sessions_mutex); | |
1387 | enabler->enabled = 0; | |
1388 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1389 | mutex_unlock(&sessions_mutex); | |
1390 | return 0; | |
1391 | } | |
1392 | ||
07dfc1d0 MD |
1393 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1394 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1395 | { | |
1396 | struct lttng_filter_bytecode_node *bytecode_node; | |
1397 | uint32_t bytecode_len; | |
1398 | int ret; | |
1399 | ||
1400 | ret = get_user(bytecode_len, &bytecode->len); | |
1401 | if (ret) | |
1402 | return ret; | |
1403 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1404 | GFP_KERNEL); | |
1405 | if (!bytecode_node) | |
1406 | return -ENOMEM; | |
1407 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1408 | sizeof(*bytecode) + bytecode_len); | |
1409 | if (ret) | |
1410 | goto error_free; | |
1411 | bytecode_node->enabler = enabler; | |
1412 | /* Enforce length based on allocated size */ | |
1413 | bytecode_node->bc.len = bytecode_len; | |
1414 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1415 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1416 | return 0; | |
1417 | ||
1418 | error_free: | |
1419 | kfree(bytecode_node); | |
1420 | return ret; | |
1421 | } | |
1422 | ||
3c997079 MD |
1423 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1424 | struct lttng_kernel_context *context_param) | |
1425 | { | |
1426 | return -ENOSYS; | |
1427 | } | |
1428 | ||
1429 | static | |
1430 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1431 | { | |
07dfc1d0 MD |
1432 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1433 | ||
1434 | /* Destroy filter bytecode */ | |
1435 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1436 | &enabler->filter_bytecode_head, node) { | |
1437 | kfree(filter_node); | |
1438 | } | |
1439 | ||
3c997079 MD |
1440 | /* Destroy contexts */ |
1441 | lttng_destroy_context(enabler->ctx); | |
1442 | ||
1443 | list_del(&enabler->node); | |
1444 | kfree(enabler); | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * lttng_session_sync_enablers should be called just before starting a | |
1449 | * session. | |
1450 | * Should be called with sessions mutex held. | |
1451 | */ | |
1452 | static | |
1453 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1454 | { | |
1455 | struct lttng_enabler *enabler; | |
1456 | struct lttng_event *event; | |
1457 | ||
1458 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1459 | lttng_enabler_ref_events(enabler); | |
1460 | /* | |
1461 | * For each event, if at least one of its enablers is enabled, | |
1462 | * and its channel and session transient states are enabled, we | |
1463 | * enable the event, else we disable it. | |
1464 | */ | |
1465 | list_for_each_entry(event, &session->events, list) { | |
1466 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1467 | struct lttng_bytecode_runtime *runtime; |
1468 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1469 | |
4ecb5ad5 MD |
1470 | switch (event->instrumentation) { |
1471 | case LTTNG_KERNEL_TRACEPOINT: | |
1472 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1473 | /* Enable events */ |
1474 | list_for_each_entry(enabler_ref, | |
1475 | &event->enablers_ref_head, node) { | |
1476 | if (enabler_ref->ref->enabled) { | |
1477 | enabled = 1; | |
1478 | break; | |
1479 | } | |
1480 | } | |
4ecb5ad5 MD |
1481 | break; |
1482 | default: | |
3c997079 MD |
1483 | /* Not handled with lazy sync. */ |
1484 | continue; | |
1485 | } | |
1486 | /* | |
1487 | * Enabled state is based on union of enablers, with | |
1488 | * intesection of session and channel transient enable | |
1489 | * states. | |
1490 | */ | |
1491 | enabled = enabled && session->tstate && event->chan->tstate; | |
1492 | ||
1493 | ACCESS_ONCE(event->enabled) = enabled; | |
1494 | /* | |
1495 | * Sync tracepoint registration with event enabled | |
1496 | * state. | |
1497 | */ | |
1498 | if (enabled) { | |
1499 | register_event(event); | |
1500 | } else { | |
1501 | _lttng_event_unregister(event); | |
1502 | } | |
07dfc1d0 MD |
1503 | |
1504 | /* Check if has enablers without bytecode enabled */ | |
1505 | list_for_each_entry(enabler_ref, | |
1506 | &event->enablers_ref_head, node) { | |
1507 | if (enabler_ref->ref->enabled | |
1508 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1509 | has_enablers_without_bytecode = 1; | |
1510 | break; | |
1511 | } | |
1512 | } | |
1513 | event->has_enablers_without_bytecode = | |
1514 | has_enablers_without_bytecode; | |
1515 | ||
1516 | /* Enable filters */ | |
1517 | list_for_each_entry(runtime, | |
f127e61e | 1518 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1519 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1520 | } |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Apply enablers to session events, adding events to session if need | |
1525 | * be. It is required after each modification applied to an active | |
1526 | * session, and right before session "start". | |
1527 | * "lazy" sync means we only sync if required. | |
1528 | * Should be called with sessions mutex held. | |
1529 | */ | |
1530 | static | |
1531 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1532 | { | |
1533 | /* We can skip if session is not active */ | |
1534 | if (!session->active) | |
1535 | return; | |
1536 | lttng_session_sync_enablers(session); | |
1537 | } | |
1538 | ||
1ec3f75a | 1539 | /* |
d83004aa JD |
1540 | * Serialize at most one packet worth of metadata into a metadata |
1541 | * channel. | |
92d9f5e6 MD |
1542 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1543 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1544 | * allows us to do racy operations such as looking for remaining space left in | |
1545 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1546 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1547 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1548 | * Returns the number of bytes written in the channel, 0 if no data |
1549 | * was written and a negative value on error. | |
1ec3f75a | 1550 | */ |
b3b8072b MD |
1551 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1552 | struct channel *chan) | |
d83004aa JD |
1553 | { |
1554 | struct lib_ring_buffer_ctx ctx; | |
1555 | int ret = 0; | |
1556 | size_t len, reserve_len; | |
1557 | ||
f613e3e6 | 1558 | /* |
92d9f5e6 MD |
1559 | * Ensure we support mutiple get_next / put sequences followed by |
1560 | * put_next. The metadata cache lock protects reading the metadata | |
1561 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1562 | * "flush" operations on the buffer invoked by different processes. | |
1563 | * Moreover, since the metadata cache memory can be reallocated, we | |
1564 | * need to have exclusive access against updates even though we only | |
1565 | * read it. | |
f613e3e6 | 1566 | */ |
92d9f5e6 | 1567 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1568 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1569 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1570 | goto end; |
f613e3e6 | 1571 | |
9616f0bf JD |
1572 | /* Metadata regenerated, change the version. */ |
1573 | if (stream->metadata_cache->version != stream->version) | |
1574 | stream->version = stream->metadata_cache->version; | |
1575 | ||
d83004aa | 1576 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1577 | stream->metadata_in; |
9de2c215 | 1578 | if (!len) |
de23d59d | 1579 | goto end; |
d83004aa | 1580 | reserve_len = min_t(size_t, |
b3b8072b | 1581 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1582 | len); |
b3b8072b | 1583 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1584 | sizeof(char), -1); |
1585 | /* | |
1586 | * If reservation failed, return an error to the caller. | |
1587 | */ | |
b3b8072b | 1588 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1589 | if (ret != 0) { |
1590 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1591 | goto end; | |
1592 | } | |
b3b8072b | 1593 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1594 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1595 | reserve_len); |
b3b8072b | 1596 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1597 | stream->metadata_in += reserve_len; |
d83004aa JD |
1598 | ret = reserve_len; |
1599 | ||
1600 | end: | |
92d9f5e6 | 1601 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1602 | return ret; |
1603 | } | |
1604 | ||
1605 | /* | |
1606 | * Write the metadata to the metadata cache. | |
1607 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1608 | * The metadata cache lock protects us from concurrent read access from |
1609 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1610 | */ |
a90917c3 | 1611 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1612 | const char *fmt, ...) |
1613 | { | |
c099397a | 1614 | char *str; |
d83004aa | 1615 | size_t len; |
c099397a | 1616 | va_list ap; |
d83004aa | 1617 | struct lttng_metadata_stream *stream; |
c099397a MD |
1618 | |
1619 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1620 | ||
1621 | va_start(ap, fmt); | |
1622 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1623 | va_end(ap); | |
1624 | if (!str) | |
1625 | return -ENOMEM; | |
1626 | ||
1ec3f75a | 1627 | len = strlen(str); |
92d9f5e6 | 1628 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1629 | if (session->metadata_cache->metadata_written + len > |
1630 | session->metadata_cache->cache_alloc) { | |
1631 | char *tmp_cache_realloc; | |
1632 | unsigned int tmp_cache_alloc_size; | |
1633 | ||
1634 | tmp_cache_alloc_size = max_t(unsigned int, | |
1635 | session->metadata_cache->cache_alloc + len, | |
1636 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1637 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1638 | if (!tmp_cache_realloc) |
1639 | goto err; | |
a606b6e8 ML |
1640 | if (session->metadata_cache->data) { |
1641 | memcpy(tmp_cache_realloc, | |
1642 | session->metadata_cache->data, | |
1643 | session->metadata_cache->cache_alloc); | |
1644 | vfree(session->metadata_cache->data); | |
1645 | } | |
1646 | ||
d83004aa JD |
1647 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1648 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1649 | } |
d83004aa JD |
1650 | memcpy(session->metadata_cache->data + |
1651 | session->metadata_cache->metadata_written, | |
1652 | str, len); | |
1653 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1654 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1655 | kfree(str); |
d83004aa JD |
1656 | |
1657 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1658 | wake_up_interruptible(&stream->read_wait); | |
1659 | ||
1660 | return 0; | |
1661 | ||
1662 | err: | |
92d9f5e6 | 1663 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1664 | kfree(str); |
1665 | return -ENOMEM; | |
c099397a MD |
1666 | } |
1667 | ||
f513b2bf MD |
1668 | static |
1669 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1670 | { | |
1671 | size_t i; | |
1672 | ||
1673 | for (i = 0; i < nesting; i++) { | |
1674 | int ret; | |
1675 | ||
1676 | ret = lttng_metadata_printf(session, " "); | |
1677 | if (ret) { | |
1678 | return ret; | |
1679 | } | |
1680 | } | |
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * Must be called with sessions_mutex held. | |
1686 | */ | |
1687 | static | |
1688 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1689 | const struct lttng_type *type, | |
1690 | size_t nesting) | |
1691 | { | |
1692 | int ret; | |
1693 | uint32_t i, nr_fields; | |
1694 | ||
1695 | ret = print_tabs(session, nesting); | |
1696 | if (ret) | |
1697 | return ret; | |
1698 | ret = lttng_metadata_printf(session, | |
1699 | "struct {\n"); | |
1700 | if (ret) | |
1701 | return ret; | |
1702 | nr_fields = type->u._struct.nr_fields; | |
1703 | for (i = 0; i < nr_fields; i++) { | |
1704 | const struct lttng_event_field *iter_field; | |
1705 | ||
1706 | iter_field = &type->u._struct.fields[i]; | |
1707 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1708 | if (ret) | |
1709 | return ret; | |
1710 | } | |
1711 | ret = print_tabs(session, nesting); | |
1712 | if (ret) | |
1713 | return ret; | |
1714 | ret = lttng_metadata_printf(session, | |
1715 | "}"); | |
1716 | return ret; | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Must be called with sessions_mutex held. | |
1721 | */ | |
1722 | static | |
1723 | int _lttng_struct_statedump(struct lttng_session *session, | |
1724 | const struct lttng_event_field *field, | |
1725 | size_t nesting) | |
1726 | { | |
1727 | int ret; | |
1728 | ||
1729 | ret = _lttng_struct_type_statedump(session, | |
1730 | &field->type, nesting); | |
1731 | if (ret) | |
1732 | return ret; | |
1733 | ret = lttng_metadata_printf(session, | |
1734 | "_%s;\n", | |
1735 | field->name); | |
1736 | return ret; | |
1737 | } | |
1738 | ||
65c85aa6 MD |
1739 | /* |
1740 | * Must be called with sessions_mutex held. | |
1741 | */ | |
1742 | static | |
1743 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1744 | const struct lttng_type *type, | |
1745 | size_t nesting) | |
1746 | { | |
1747 | int ret; | |
1748 | uint32_t i, nr_choices; | |
1749 | ||
1750 | ret = print_tabs(session, nesting); | |
1751 | if (ret) | |
1752 | return ret; | |
1753 | ret = lttng_metadata_printf(session, | |
1754 | "variant <_%s> {\n", | |
1755 | type->u.variant.tag_name); | |
1756 | if (ret) | |
1757 | return ret; | |
1758 | nr_choices = type->u.variant.nr_choices; | |
1759 | for (i = 0; i < nr_choices; i++) { | |
1760 | const struct lttng_event_field *iter_field; | |
1761 | ||
1762 | iter_field = &type->u.variant.choices[i]; | |
1763 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1764 | if (ret) | |
1765 | return ret; | |
1766 | } | |
1767 | ret = print_tabs(session, nesting); | |
1768 | if (ret) | |
1769 | return ret; | |
1770 | ret = lttng_metadata_printf(session, | |
1771 | "}"); | |
1772 | return ret; | |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * Must be called with sessions_mutex held. | |
1777 | */ | |
1778 | static | |
1779 | int _lttng_variant_statedump(struct lttng_session *session, | |
1780 | const struct lttng_event_field *field, | |
1781 | size_t nesting) | |
1782 | { | |
1783 | int ret; | |
1784 | ||
1785 | ret = _lttng_variant_type_statedump(session, | |
1786 | &field->type, nesting); | |
1787 | if (ret) | |
1788 | return ret; | |
1789 | ret = lttng_metadata_printf(session, | |
1790 | "_%s;\n", | |
1791 | field->name); | |
1792 | return ret; | |
1793 | } | |
1794 | ||
f513b2bf MD |
1795 | /* |
1796 | * Must be called with sessions_mutex held. | |
1797 | */ | |
1798 | static | |
1799 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1800 | const struct lttng_event_field *field, | |
1801 | size_t nesting) | |
1802 | { | |
1803 | int ret; | |
1804 | const struct lttng_type *elem_type; | |
1805 | ||
65c85aa6 | 1806 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1807 | elem_type = field->type.u.array_compound.elem_type; |
1808 | switch (elem_type->atype) { | |
1809 | case atype_struct: | |
1810 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1811 | if (ret) | |
1812 | return ret; | |
1813 | break; | |
65c85aa6 MD |
1814 | case atype_variant: |
1815 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1816 | if (ret) | |
1817 | return ret; | |
1818 | break; | |
f513b2bf MD |
1819 | default: |
1820 | return -EINVAL; | |
1821 | } | |
1822 | ret = lttng_metadata_printf(session, | |
1823 | " _%s[%u];\n", | |
1824 | field->name, | |
1825 | field->type.u.array_compound.length); | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * Must be called with sessions_mutex held. | |
1831 | */ | |
1832 | static | |
1833 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1834 | const struct lttng_event_field *field, | |
1835 | size_t nesting) | |
1836 | { | |
1837 | int ret; | |
1838 | const char *length_name; | |
1839 | const struct lttng_type *elem_type; | |
1840 | ||
1841 | length_name = field->type.u.sequence_compound.length_name; | |
1842 | ||
65c85aa6 | 1843 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1844 | elem_type = field->type.u.sequence_compound.elem_type; |
1845 | switch (elem_type->atype) { | |
1846 | case atype_struct: | |
1847 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1848 | if (ret) | |
1849 | return ret; | |
1850 | break; | |
65c85aa6 MD |
1851 | case atype_variant: |
1852 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1853 | if (ret) | |
1854 | return ret; | |
1855 | break; | |
f513b2bf MD |
1856 | default: |
1857 | return -EINVAL; | |
1858 | } | |
1859 | ret = lttng_metadata_printf(session, | |
1860 | " _%s[ _%s ];\n", | |
1861 | field->name, | |
1862 | length_name); | |
1863 | return ret; | |
1864 | } | |
1865 | ||
d83004aa JD |
1866 | /* |
1867 | * Must be called with sessions_mutex held. | |
1868 | */ | |
c099397a | 1869 | static |
a90917c3 | 1870 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1871 | const struct lttng_event_field *field, |
1872 | size_t nesting) | |
c099397a | 1873 | { |
c099397a | 1874 | int ret = 0; |
c099397a | 1875 | |
8070f5c0 MD |
1876 | switch (field->type.atype) { |
1877 | case atype_integer: | |
f513b2bf MD |
1878 | ret = print_tabs(session, nesting); |
1879 | if (ret) | |
1880 | return ret; | |
8070f5c0 | 1881 | ret = lttng_metadata_printf(session, |
f513b2bf | 1882 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1883 | field->type.u.basic.integer.size, |
1884 | field->type.u.basic.integer.alignment, | |
1885 | field->type.u.basic.integer.signedness, | |
1886 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1887 | ? "none" | |
1888 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1889 | ? "UTF8" | |
1890 | : "ASCII", | |
1891 | field->type.u.basic.integer.base, | |
5214fa50 | 1892 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1893 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1894 | #else |
8070f5c0 | 1895 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1896 | #endif |
8070f5c0 MD |
1897 | field->name); |
1898 | break; | |
1899 | case atype_enum: | |
f513b2bf MD |
1900 | ret = print_tabs(session, nesting); |
1901 | if (ret) | |
1902 | return ret; | |
8070f5c0 | 1903 | ret = lttng_metadata_printf(session, |
f513b2bf | 1904 | "%s _%s;\n", |
8070f5c0 MD |
1905 | field->type.u.basic.enumeration.name, |
1906 | field->name); | |
1907 | break; | |
1908 | case atype_array: | |
1909 | { | |
1910 | const struct lttng_basic_type *elem_type; | |
1911 | ||
1912 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 1913 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
1914 | ret = print_tabs(session, nesting); |
1915 | if (ret) | |
1916 | return ret; | |
43803cf2 | 1917 | ret = lttng_metadata_printf(session, |
f513b2bf | 1918 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
1919 | field->type.u.array.elem_alignment * CHAR_BIT, |
1920 | field->name); | |
1921 | if (ret) | |
1922 | return ret; | |
1923 | } | |
f513b2bf MD |
1924 | ret = print_tabs(session, nesting); |
1925 | if (ret) | |
1926 | return ret; | |
8070f5c0 | 1927 | ret = lttng_metadata_printf(session, |
f513b2bf | 1928 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1929 | elem_type->u.basic.integer.size, |
1930 | elem_type->u.basic.integer.alignment, | |
1931 | elem_type->u.basic.integer.signedness, | |
1932 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1933 | ? "none" | |
1934 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1935 | ? "UTF8" | |
1936 | : "ASCII", | |
1937 | elem_type->u.basic.integer.base, | |
5214fa50 | 1938 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1939 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1940 | #else |
8070f5c0 | 1941 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1942 | #endif |
8070f5c0 MD |
1943 | field->name, field->type.u.array.length); |
1944 | break; | |
1945 | } | |
1946 | case atype_sequence: | |
1947 | { | |
1948 | const struct lttng_basic_type *elem_type; | |
1949 | const struct lttng_basic_type *length_type; | |
1950 | ||
1951 | elem_type = &field->type.u.sequence.elem_type; | |
1952 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
1953 | ret = print_tabs(session, nesting); |
1954 | if (ret) | |
1955 | return ret; | |
8070f5c0 | 1956 | ret = lttng_metadata_printf(session, |
f513b2bf | 1957 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 1958 | length_type->u.basic.integer.size, |
32257272 | 1959 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1960 | length_type->u.basic.integer.signedness, |
1961 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1962 | ? "none" | |
0635cdd4 | 1963 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1964 | ? "UTF8" |
0635cdd4 | 1965 | : "ASCII"), |
8070f5c0 | 1966 | length_type->u.basic.integer.base, |
5214fa50 | 1967 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1968 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1969 | #else |
0635cdd4 | 1970 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1971 | #endif |
27d2368e MD |
1972 | field->name); |
1973 | if (ret) | |
1974 | return ret; | |
1975 | ||
43803cf2 | 1976 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
1977 | ret = print_tabs(session, nesting); |
1978 | if (ret) | |
1979 | return ret; | |
43803cf2 | 1980 | ret = lttng_metadata_printf(session, |
f513b2bf | 1981 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
1982 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
1983 | field->name); | |
1984 | if (ret) | |
1985 | return ret; | |
1986 | } | |
f513b2bf MD |
1987 | ret = print_tabs(session, nesting); |
1988 | if (ret) | |
1989 | return ret; | |
27d2368e | 1990 | ret = lttng_metadata_printf(session, |
f513b2bf | 1991 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1992 | elem_type->u.basic.integer.size, |
32257272 | 1993 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1994 | elem_type->u.basic.integer.signedness, |
1995 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1996 | ? "none" | |
0635cdd4 | 1997 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1998 | ? "UTF8" |
0635cdd4 | 1999 | : "ASCII"), |
8070f5c0 | 2000 | elem_type->u.basic.integer.base, |
5214fa50 | 2001 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2002 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2003 | #else |
8070f5c0 | 2004 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2005 | #endif |
8070f5c0 | 2006 | field->name, |
27d2368e | 2007 | field->name); |
8070f5c0 MD |
2008 | break; |
2009 | } | |
c099397a | 2010 | |
8070f5c0 MD |
2011 | case atype_string: |
2012 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2013 | ret = print_tabs(session, nesting); |
2014 | if (ret) | |
2015 | return ret; | |
8070f5c0 | 2016 | ret = lttng_metadata_printf(session, |
f513b2bf | 2017 | "string%s _%s;\n", |
8070f5c0 MD |
2018 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2019 | " { encoding = ASCII; }" : "", | |
2020 | field->name); | |
2021 | break; | |
f513b2bf MD |
2022 | case atype_struct: |
2023 | ret = _lttng_struct_statedump(session, field, nesting); | |
2024 | break; | |
2025 | case atype_array_compound: | |
2026 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2027 | break; | |
2028 | case atype_sequence_compound: | |
2029 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2030 | break; | |
65c85aa6 MD |
2031 | case atype_variant: |
2032 | ret = _lttng_variant_statedump(session, field, nesting); | |
2033 | break; | |
f513b2bf | 2034 | |
8070f5c0 MD |
2035 | default: |
2036 | WARN_ON_ONCE(1); | |
2037 | return -EINVAL; | |
2038 | } | |
2039 | return ret; | |
2040 | } | |
2041 | ||
2042 | static | |
a90917c3 | 2043 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2044 | struct lttng_ctx *ctx) |
2045 | { | |
2046 | int ret = 0; | |
2047 | int i; | |
2048 | ||
2049 | if (!ctx) | |
2050 | return 0; | |
2051 | for (i = 0; i < ctx->nr_fields; i++) { | |
2052 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2053 | ||
f513b2bf | 2054 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2055 | if (ret) |
2056 | return ret; | |
2057 | } | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | static | |
a90917c3 MD |
2062 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2063 | struct lttng_event *event) | |
8070f5c0 MD |
2064 | { |
2065 | const struct lttng_event_desc *desc = event->desc; | |
2066 | int ret = 0; | |
2067 | int i; | |
2068 | ||
2069 | for (i = 0; i < desc->nr_fields; i++) { | |
2070 | const struct lttng_event_field *field = &desc->fields[i]; | |
2071 | ||
f513b2bf | 2072 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2073 | if (ret) |
2074 | return ret; | |
c099397a MD |
2075 | } |
2076 | return ret; | |
2077 | } | |
2078 | ||
d83004aa JD |
2079 | /* |
2080 | * Must be called with sessions_mutex held. | |
2081 | */ | |
c099397a | 2082 | static |
a90917c3 MD |
2083 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2084 | struct lttng_channel *chan, | |
2085 | struct lttng_event *event) | |
c099397a MD |
2086 | { |
2087 | int ret = 0; | |
2088 | ||
2089 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2090 | return 0; | |
d83004aa | 2091 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2092 | return 0; |
2093 | ||
2094 | ret = lttng_metadata_printf(session, | |
2095 | "event {\n" | |
ae734547 | 2096 | " name = \"%s\";\n" |
c099397a | 2097 | " id = %u;\n" |
b9074a1b | 2098 | " stream_id = %u;\n", |
c099397a MD |
2099 | event->desc->name, |
2100 | event->id, | |
2101 | event->chan->id); | |
2102 | if (ret) | |
2103 | goto end; | |
2104 | ||
b9074a1b MD |
2105 | if (event->ctx) { |
2106 | ret = lttng_metadata_printf(session, | |
2107 | " context := struct {\n"); | |
2108 | if (ret) | |
2109 | goto end; | |
2110 | } | |
a90917c3 | 2111 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2112 | if (ret) |
2113 | goto end; | |
b9074a1b MD |
2114 | if (event->ctx) { |
2115 | ret = lttng_metadata_printf(session, | |
2116 | " };\n"); | |
2117 | if (ret) | |
2118 | goto end; | |
2119 | } | |
8070f5c0 MD |
2120 | |
2121 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2122 | " fields := struct {\n" |
2123 | ); | |
2124 | if (ret) | |
2125 | goto end; | |
2126 | ||
a90917c3 | 2127 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2128 | if (ret) |
2129 | goto end; | |
2130 | ||
2131 | /* | |
2132 | * LTTng space reservation can only reserve multiples of the | |
2133 | * byte size. | |
2134 | */ | |
2135 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2136 | " };\n" |
2137 | "};\n\n"); | |
c099397a MD |
2138 | if (ret) |
2139 | goto end; | |
2140 | ||
c099397a MD |
2141 | event->metadata_dumped = 1; |
2142 | end: | |
2143 | return ret; | |
2144 | ||
2145 | } | |
2146 | ||
d83004aa JD |
2147 | /* |
2148 | * Must be called with sessions_mutex held. | |
2149 | */ | |
c099397a | 2150 | static |
a90917c3 MD |
2151 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2152 | struct lttng_channel *chan) | |
c099397a MD |
2153 | { |
2154 | int ret = 0; | |
2155 | ||
2156 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2157 | return 0; | |
d83004aa JD |
2158 | |
2159 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2160 | return 0; |
2161 | ||
2162 | WARN_ON_ONCE(!chan->header_type); | |
2163 | ret = lttng_metadata_printf(session, | |
2164 | "stream {\n" | |
2165 | " id = %u;\n" | |
9115fbdc | 2166 | " event.header := %s;\n" |
b9074a1b | 2167 | " packet.context := struct packet_context;\n", |
c099397a MD |
2168 | chan->id, |
2169 | chan->header_type == 1 ? "struct event_header_compact" : | |
2170 | "struct event_header_large"); | |
2171 | if (ret) | |
2172 | goto end; | |
2173 | ||
b9074a1b MD |
2174 | if (chan->ctx) { |
2175 | ret = lttng_metadata_printf(session, | |
2176 | " event.context := struct {\n"); | |
2177 | if (ret) | |
2178 | goto end; | |
2179 | } | |
a90917c3 | 2180 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2181 | if (ret) |
2182 | goto end; | |
b9074a1b MD |
2183 | if (chan->ctx) { |
2184 | ret = lttng_metadata_printf(session, | |
2185 | " };\n"); | |
2186 | if (ret) | |
2187 | goto end; | |
2188 | } | |
8070f5c0 MD |
2189 | |
2190 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2191 | "};\n\n"); |
8070f5c0 | 2192 | |
c099397a MD |
2193 | chan->metadata_dumped = 1; |
2194 | end: | |
2195 | return ret; | |
2196 | } | |
2197 | ||
d83004aa JD |
2198 | /* |
2199 | * Must be called with sessions_mutex held. | |
2200 | */ | |
9115fbdc | 2201 | static |
a90917c3 | 2202 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2203 | { |
2204 | return lttng_metadata_printf(session, | |
2205 | "struct packet_context {\n" | |
a3ccff4f MD |
2206 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2207 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2208 | " uint64_t content_size;\n" |
2209 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2210 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2211 | " unsigned long events_discarded;\n" |
9115fbdc | 2212 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2213 | "};\n\n" |
9115fbdc MD |
2214 | ); |
2215 | } | |
2216 | ||
2217 | /* | |
2218 | * Compact header: | |
2219 | * id: range: 0 - 30. | |
2220 | * id 31 is reserved to indicate an extended header. | |
2221 | * | |
2222 | * Large header: | |
2223 | * id: range: 0 - 65534. | |
2224 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2225 | * |
2226 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2227 | */ |
2228 | static | |
a90917c3 | 2229 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2230 | { |
2231 | return lttng_metadata_printf(session, | |
2232 | "struct event_header_compact {\n" | |
2233 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2234 | " variant <id> {\n" | |
2235 | " struct {\n" | |
a3ccff4f | 2236 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2237 | " } compact;\n" |
2238 | " struct {\n" | |
2239 | " uint32_t id;\n" | |
a3ccff4f | 2240 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2241 | " } extended;\n" |
2242 | " } v;\n" | |
2243 | "} align(%u);\n" | |
2244 | "\n" | |
2245 | "struct event_header_large {\n" | |
2246 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2247 | " variant <id> {\n" | |
2248 | " struct {\n" | |
a3ccff4f | 2249 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2250 | " } compact;\n" |
2251 | " struct {\n" | |
2252 | " uint32_t id;\n" | |
a3ccff4f | 2253 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2254 | " } extended;\n" |
2255 | " } v;\n" | |
2256 | "} align(%u);\n\n", | |
a90917c3 MD |
2257 | lttng_alignof(uint32_t) * CHAR_BIT, |
2258 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2259 | ); |
2260 | } | |
2261 | ||
a3ccff4f MD |
2262 | /* |
2263 | * Approximation of NTP time of day to clock monotonic correlation, | |
2264 | * taken at start of trace. | |
2265 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2266 | * in future versions. | |
5283350b MD |
2267 | * This function may return a negative offset. It may happen if the |
2268 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2269 | */ |
2270 | static | |
8967b2a3 | 2271 | int64_t measure_clock_offset(void) |
a3ccff4f | 2272 | { |
dcb93448 | 2273 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2274 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2275 | int64_t offset; |
a3ccff4f MD |
2276 | struct timespec rts = { 0, 0 }; |
2277 | unsigned long flags; | |
2278 | ||
2279 | /* Disable interrupts to increase correlation precision. */ | |
2280 | local_irq_save(flags); | |
2281 | monotonic[0] = trace_clock_read64(); | |
2282 | getnstimeofday(&rts); | |
2283 | monotonic[1] = trace_clock_read64(); | |
2284 | local_irq_restore(flags); | |
2285 | ||
dcb93448 | 2286 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2287 | realtime = (uint64_t) rts.tv_sec * tcf; |
2288 | if (tcf == NSEC_PER_SEC) { | |
2289 | realtime += rts.tv_nsec; | |
2290 | } else { | |
2291 | uint64_t n = rts.tv_nsec * tcf; | |
2292 | ||
2293 | do_div(n, NSEC_PER_SEC); | |
2294 | realtime += n; | |
2295 | } | |
dcb93448 | 2296 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2297 | return offset; |
2298 | } | |
2299 | ||
c099397a MD |
2300 | /* |
2301 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2302 | * Must be called with sessions_mutex held. |
c099397a MD |
2303 | */ |
2304 | static | |
a90917c3 | 2305 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2306 | { |
30bdb6e4 | 2307 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2308 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2309 | struct lttng_channel *chan; |
2310 | struct lttng_event *event; | |
c099397a MD |
2311 | int ret = 0; |
2312 | ||
2313 | if (!ACCESS_ONCE(session->active)) | |
2314 | return 0; | |
2315 | if (session->metadata_dumped) | |
2316 | goto skip_session; | |
c099397a | 2317 | |
d793d5e1 | 2318 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2319 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2320 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2321 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2322 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2323 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2324 | |
2325 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2326 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2327 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2328 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2329 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2330 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2331 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2332 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2333 | "\n" |
2334 | "trace {\n" | |
2335 | " major = %u;\n" | |
2336 | " minor = %u;\n" | |
30bdb6e4 | 2337 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2338 | " byte_order = %s;\n" |
2339 | " packet.header := struct {\n" | |
2340 | " uint32_t magic;\n" | |
1ec3f75a | 2341 | " uint8_t uuid[16];\n" |
d793d5e1 | 2342 | " uint32_t stream_id;\n" |
5594698f | 2343 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2344 | " };\n" |
d793d5e1 | 2345 | "};\n\n", |
a90917c3 MD |
2346 | lttng_alignof(uint8_t) * CHAR_BIT, |
2347 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2348 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2349 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2350 | sizeof(unsigned long) * CHAR_BIT, |
2351 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2352 | CTF_SPEC_MAJOR, |
2353 | CTF_SPEC_MINOR, | |
d793d5e1 | 2354 | uuid_s, |
5214fa50 | 2355 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2356 | "be" |
2357 | #else | |
2358 | "le" | |
2359 | #endif | |
2360 | ); | |
2361 | if (ret) | |
2362 | goto end; | |
2363 | ||
99dc9597 MD |
2364 | ret = lttng_metadata_printf(session, |
2365 | "env {\n" | |
a6058143 | 2366 | " hostname = \"%s\";\n" |
c6c9e10f | 2367 | " domain = \"kernel\";\n" |
99dc9597 | 2368 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2369 | " kernel_release = \"%s\";\n" |
2370 | " kernel_version = \"%s\";\n" | |
2371 | " tracer_name = \"lttng-modules\";\n" | |
2372 | " tracer_major = %d;\n" | |
2373 | " tracer_minor = %d;\n" | |
2374 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2375 | "};\n\n", |
3d0d43db | 2376 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2377 | utsname()->sysname, |
2378 | utsname()->release, | |
c6c9e10f MD |
2379 | utsname()->version, |
2380 | LTTNG_MODULES_MAJOR_VERSION, | |
2381 | LTTNG_MODULES_MINOR_VERSION, | |
2382 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2383 | ); |
2384 | if (ret) | |
2385 | goto end; | |
2386 | ||
a3ccff4f MD |
2387 | ret = lttng_metadata_printf(session, |
2388 | "clock {\n" | |
2754583e MD |
2389 | " name = \"%s\";\n", |
2390 | trace_clock_name() | |
a82c63f1 MD |
2391 | ); |
2392 | if (ret) | |
2393 | goto end; | |
2394 | ||
2395 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2396 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2397 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2398 | clock_uuid_s |
2399 | ); | |
2400 | if (ret) | |
2401 | goto end; | |
2402 | } | |
2403 | ||
2404 | ret = lttng_metadata_printf(session, | |
2754583e | 2405 | " description = \"%s\";\n" |
a3ccff4f MD |
2406 | " freq = %llu; /* Frequency, in Hz */\n" |
2407 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2408 | " offset = %lld;\n" |
a3ccff4f | 2409 | "};\n\n", |
2754583e | 2410 | trace_clock_description(), |
a3ccff4f | 2411 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2412 | (long long) measure_clock_offset() |
a3ccff4f MD |
2413 | ); |
2414 | if (ret) | |
2415 | goto end; | |
2416 | ||
2417 | ret = lttng_metadata_printf(session, | |
2418 | "typealias integer {\n" | |
2419 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2420 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2421 | "} := uint27_clock_monotonic_t;\n" |
2422 | "\n" | |
2423 | "typealias integer {\n" | |
2424 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2425 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2426 | "} := uint32_clock_monotonic_t;\n" |
2427 | "\n" | |
2428 | "typealias integer {\n" | |
2429 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2430 | " map = clock.%s.value;\n" |
a3ccff4f | 2431 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2432 | trace_clock_name(), |
a3ccff4f | 2433 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2434 | trace_clock_name(), |
2435 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2436 | trace_clock_name() | |
a3ccff4f MD |
2437 | ); |
2438 | if (ret) | |
2439 | goto end; | |
2440 | ||
a90917c3 | 2441 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2442 | if (ret) |
2443 | goto end; | |
2444 | ||
a90917c3 | 2445 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2446 | if (ret) |
2447 | goto end; | |
2448 | ||
c099397a MD |
2449 | skip_session: |
2450 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2451 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2452 | if (ret) |
2453 | goto end; | |
2454 | } | |
2455 | ||
2456 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2457 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2458 | if (ret) |
2459 | goto end; | |
2460 | } | |
2461 | session->metadata_dumped = 1; | |
2462 | end: | |
2463 | return ret; | |
2464 | } | |
2465 | ||
c0e31d2e | 2466 | /** |
a90917c3 | 2467 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2468 | * @transport: transport structure |
2469 | * | |
2470 | * Registers a transport which can be used as output to extract the data out of | |
2471 | * LTTng. The module calling this registration function must ensure that no | |
2472 | * trap-inducing code will be executed by the transport functions. E.g. | |
2473 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2474 | * is made visible to the transport function. This registration acts as a | |
2475 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2476 | * after its registration must it synchronize the TLBs. | |
2477 | */ | |
a90917c3 | 2478 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2479 | { |
2480 | /* | |
2481 | * Make sure no page fault can be triggered by the module about to be | |
2482 | * registered. We deal with this here so we don't have to call | |
2483 | * vmalloc_sync_all() in each module's init. | |
2484 | */ | |
6d2a620c | 2485 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2486 | |
2487 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2488 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2489 | mutex_unlock(&sessions_mutex); |
2490 | } | |
a90917c3 | 2491 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2492 | |
2493 | /** | |
a90917c3 | 2494 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2495 | * @transport: transport structure |
2496 | */ | |
a90917c3 | 2497 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2498 | { |
2499 | mutex_lock(&sessions_mutex); | |
2500 | list_del(&transport->node); | |
2501 | mutex_unlock(&sessions_mutex); | |
2502 | } | |
a90917c3 | 2503 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2504 | |
a90917c3 | 2505 | static int __init lttng_events_init(void) |
4e3c1b9b | 2506 | { |
1c25284c MD |
2507 | int ret; |
2508 | ||
453b2495 JD |
2509 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2510 | if (ret) | |
2511 | return ret; | |
389d7070 | 2512 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2513 | if (ret) |
2514 | return ret; | |
2515 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2516 | if (ret) |
2517 | return ret; | |
2518 | ret = lttng_probes_init(); | |
389d7070 MD |
2519 | if (ret) |
2520 | return ret; | |
07dfc1d0 | 2521 | ret = lttng_context_init(); |
20591cf7 MD |
2522 | if (ret) |
2523 | return ret; | |
07dfc1d0 MD |
2524 | ret = lttng_tracepoint_init(); |
2525 | if (ret) | |
2526 | goto error_tp; | |
a90917c3 | 2527 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2528 | if (!event_cache) { |
2529 | ret = -ENOMEM; | |
2530 | goto error_kmem; | |
2531 | } | |
80996790 | 2532 | ret = lttng_abi_init(); |
02119ee5 MD |
2533 | if (ret) |
2534 | goto error_abi; | |
0c956676 MD |
2535 | ret = lttng_logger_init(); |
2536 | if (ret) | |
2537 | goto error_logger; | |
4e3c1b9b | 2538 | return 0; |
0c956676 MD |
2539 | |
2540 | error_logger: | |
2541 | lttng_abi_exit(); | |
02119ee5 | 2542 | error_abi: |
1c25284c | 2543 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2544 | error_kmem: |
2545 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2546 | error_tp: |
2547 | lttng_context_exit(); | |
1c25284c | 2548 | return ret; |
4e3c1b9b MD |
2549 | } |
2550 | ||
a90917c3 | 2551 | module_init(lttng_events_init); |
11b5a3c2 | 2552 | |
a90917c3 | 2553 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2554 | { |
a90917c3 | 2555 | struct lttng_session *session, *tmpsession; |
92e94819 | 2556 | |
0c956676 | 2557 | lttng_logger_exit(); |
80996790 | 2558 | lttng_abi_exit(); |
92e94819 | 2559 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2560 | lttng_session_destroy(session); |
11b5a3c2 | 2561 | kmem_cache_destroy(event_cache); |
20591cf7 | 2562 | lttng_tracepoint_exit(); |
07dfc1d0 | 2563 | lttng_context_exit(); |
4e3c1b9b | 2564 | } |
92e94819 | 2565 | |
a90917c3 | 2566 | module_exit(lttng_events_exit); |
11b5a3c2 | 2567 | |
92e94819 MD |
2568 | MODULE_LICENSE("GPL and additional rights"); |
2569 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2570 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2571 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2572 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2573 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2574 | LTTNG_MODULES_EXTRAVERSION); |