Commit | Line | Data |
---|---|---|
4e3c1b9b | 1 | /* |
a90917c3 | 2 | * lttng-events.c |
4e3c1b9b | 3 | * |
4e3c1b9b | 4 | * Holds LTTng per-session event registry. |
17baffe2 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
4e3c1b9b MD |
21 | */ |
22 | ||
389d7070 MD |
23 | /* |
24 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
25 | * overrides a function with a define. | |
26 | */ | |
27 | #include "wrapper/page_alloc.h" | |
28 | ||
4e3c1b9b | 29 | #include <linux/module.h> |
c0e31d2e MD |
30 | #include <linux/mutex.h> |
31 | #include <linux/sched.h> | |
11b5a3c2 | 32 | #include <linux/slab.h> |
c099397a | 33 | #include <linux/jiffies.h> |
99dc9597 | 34 | #include <linux/utsname.h> |
abc0446a | 35 | #include <linux/err.h> |
7e6f9ef6 MD |
36 | #include <linux/seq_file.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/anon_inodes.h> | |
241ae9a8 | 39 | #include <wrapper/file.h> |
3c997079 | 40 | #include <linux/jhash.h> |
8c6e7f13 | 41 | #include <linux/uaccess.h> |
a606b6e8 | 42 | #include <linux/vmalloc.h> |
3c997079 | 43 | |
241ae9a8 MD |
44 | #include <wrapper/uuid.h> |
45 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ | |
46 | #include <wrapper/random.h> | |
47 | #include <wrapper/tracepoint.h> | |
48 | #include <wrapper/list.h> | |
49 | #include <lttng-kernel-version.h> | |
50 | #include <lttng-events.h> | |
51 | #include <lttng-tracer.h> | |
52 | #include <lttng-abi-old.h> | |
5214fa50 | 53 | #include <lttng-endian.h> |
241ae9a8 | 54 | #include <wrapper/vzalloc.h> |
64af2437 MD |
55 | #include <wrapper/ringbuffer/backend.h> |
56 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 57 | |
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
62 | /* |
63 | * Protect the sessions and metadata caches. | |
64 | */ | |
4e3c1b9b MD |
65 | static DEFINE_MUTEX(sessions_mutex); |
66 | static struct kmem_cache *event_cache; | |
67 | ||
3c997079 MD |
68 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
69 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
70 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
71 | ||
a90917c3 MD |
72 | static void _lttng_event_destroy(struct lttng_event *event); |
73 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
74 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 75 | static |
a90917c3 MD |
76 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
77 | struct lttng_channel *chan, | |
78 | struct lttng_event *event); | |
c099397a | 79 | static |
a90917c3 | 80 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
83 | static |
84 | int _lttng_field_statedump(struct lttng_session *session, | |
85 | const struct lttng_event_field *field, | |
86 | size_t nesting); | |
c099397a | 87 | |
c099397a | 88 | void synchronize_trace(void) |
abcca994 MD |
89 | { |
90 | synchronize_sched(); | |
b8590f40 MD |
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
92 | #ifdef CONFIG_PREEMPT_RT_FULL | |
93 | synchronize_rcu(); | |
94 | #endif | |
95 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
96 | #ifdef CONFIG_PREEMPT_RT |
97 | synchronize_rcu(); | |
98 | #endif | |
b8590f40 | 99 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
100 | } |
101 | ||
3c997079 MD |
102 | void lttng_lock_sessions(void) |
103 | { | |
104 | mutex_lock(&sessions_mutex); | |
105 | } | |
106 | ||
107 | void lttng_unlock_sessions(void) | |
108 | { | |
109 | mutex_unlock(&sessions_mutex); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Called with sessions lock held. | |
114 | */ | |
115 | int lttng_session_active(void) | |
116 | { | |
117 | struct lttng_session *iter; | |
118 | ||
119 | list_for_each_entry(iter, &sessions, list) { | |
120 | if (iter->active) | |
121 | return 1; | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
a90917c3 | 126 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 127 | { |
a90917c3 | 128 | struct lttng_session *session; |
d83004aa | 129 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 130 | int i; |
4e3c1b9b MD |
131 | |
132 | mutex_lock(&sessions_mutex); | |
df57c35d | 133 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 134 | if (!session) |
d83004aa | 135 | goto err; |
4e3c1b9b | 136 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 137 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 138 | uuid_le_gen(&session->uuid); |
d83004aa JD |
139 | |
140 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
141 | GFP_KERNEL); | |
142 | if (!metadata_cache) | |
143 | goto err_free_session; | |
f6da044f | 144 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
145 | if (!metadata_cache->data) |
146 | goto err_free_cache; | |
147 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
148 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 149 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
150 | session->metadata_cache = metadata_cache; |
151 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
152 | memcpy(&metadata_cache->uuid, &session->uuid, |
153 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
154 | INIT_LIST_HEAD(&session->enablers_head); |
155 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
156 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 157 | list_add(&session->list, &sessions); |
6599a4eb MD |
158 | session->pid_tracker.session = session; |
159 | session->pid_tracker.tracker_type = TRACKER_PID; | |
160 | session->vpid_tracker.session = session; | |
161 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
162 | session->uid_tracker.session = session; | |
163 | session->uid_tracker.tracker_type = TRACKER_UID; | |
164 | session->vuid_tracker.session = session; | |
165 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
166 | session->gid_tracker.session = session; | |
167 | session->gid_tracker.tracker_type = TRACKER_GID; | |
168 | session->vgid_tracker.session = session; | |
169 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
170 | mutex_unlock(&sessions_mutex); |
171 | return session; | |
d83004aa JD |
172 | |
173 | err_free_cache: | |
174 | kfree(metadata_cache); | |
175 | err_free_session: | |
df57c35d | 176 | lttng_kvfree(session); |
d83004aa JD |
177 | err: |
178 | mutex_unlock(&sessions_mutex); | |
179 | return NULL; | |
180 | } | |
181 | ||
182 | void metadata_cache_destroy(struct kref *kref) | |
183 | { | |
184 | struct lttng_metadata_cache *cache = | |
185 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 186 | vfree(cache->data); |
d83004aa | 187 | kfree(cache); |
4e3c1b9b MD |
188 | } |
189 | ||
a90917c3 | 190 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 191 | { |
a90917c3 MD |
192 | struct lttng_channel *chan, *tmpchan; |
193 | struct lttng_event *event, *tmpevent; | |
d83004aa | 194 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 195 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 196 | int ret; |
4e3c1b9b MD |
197 | |
198 | mutex_lock(&sessions_mutex); | |
d4fe3450 | 199 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
200 | list_for_each_entry(chan, &session->chan, list) { |
201 | ret = lttng_syscalls_unregister(chan); | |
202 | WARN_ON(ret); | |
203 | } | |
dda6a249 | 204 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 205 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
206 | WARN_ON(ret); |
207 | } | |
abcca994 | 208 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
209 | list_for_each_entry_safe(enabler, tmpenabler, |
210 | &session->enablers_head, node) | |
211 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 212 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 213 | _lttng_event_destroy(event); |
d83004aa JD |
214 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
215 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 216 | _lttng_channel_destroy(chan); |
d83004aa JD |
217 | } |
218 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
219 | _lttng_metadata_channel_hangup(metadata_stream); | |
6599a4eb MD |
220 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
221 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
222 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
223 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
224 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
225 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 226 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
227 | list_del(&session->list); |
228 | mutex_unlock(&sessions_mutex); | |
df57c35d | 229 | lttng_kvfree(session); |
4e3c1b9b MD |
230 | } |
231 | ||
601252cf MD |
232 | int lttng_session_statedump(struct lttng_session *session) |
233 | { | |
234 | int ret; | |
235 | ||
236 | mutex_lock(&sessions_mutex); | |
237 | ret = lttng_statedump_start(session); | |
238 | mutex_unlock(&sessions_mutex); | |
239 | return ret; | |
240 | } | |
241 | ||
a90917c3 | 242 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
243 | { |
244 | int ret = 0; | |
a90917c3 | 245 | struct lttng_channel *chan; |
c0e31d2e MD |
246 | |
247 | mutex_lock(&sessions_mutex); | |
248 | if (session->active) { | |
249 | ret = -EBUSY; | |
250 | goto end; | |
251 | } | |
c099397a | 252 | |
3c997079 MD |
253 | /* Set transient enabler state to "enabled" */ |
254 | session->tstate = 1; | |
255 | ||
c099397a MD |
256 | /* |
257 | * Snapshot the number of events per channel to know the type of header | |
258 | * we need to use. | |
259 | */ | |
260 | list_for_each_entry(chan, &session->chan, list) { | |
261 | if (chan->header_type) | |
262 | continue; /* don't change it if session stop/restart */ | |
263 | if (chan->free_event_id < 31) | |
264 | chan->header_type = 1; /* compact */ | |
265 | else | |
266 | chan->header_type = 2; /* large */ | |
267 | } | |
268 | ||
3c997079 MD |
269 | /* We need to sync enablers with session before activation. */ |
270 | lttng_session_sync_enablers(session); | |
271 | ||
64af2437 | 272 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
273 | list_for_each_entry(chan, &session->chan, list) { |
274 | if (chan->channel_type != METADATA_CHANNEL) | |
275 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
276 | } | |
64af2437 | 277 | |
d4fe3450 MJ |
278 | WRITE_ONCE(session->active, 1); |
279 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 280 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 281 | if (ret) { |
d4fe3450 | 282 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
283 | goto end; |
284 | } | |
285 | ret = lttng_statedump_start(session); | |
360f38ea | 286 | if (ret) |
d4fe3450 | 287 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
288 | end: |
289 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 290 | return ret; |
c0e31d2e MD |
291 | } |
292 | ||
a90917c3 | 293 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
294 | { |
295 | int ret = 0; | |
64af2437 | 296 | struct lttng_channel *chan; |
c0e31d2e MD |
297 | |
298 | mutex_lock(&sessions_mutex); | |
299 | if (!session->active) { | |
300 | ret = -EBUSY; | |
301 | goto end; | |
302 | } | |
d4fe3450 | 303 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
304 | |
305 | /* Set transient enabler state to "disabled" */ | |
306 | session->tstate = 0; | |
307 | lttng_session_sync_enablers(session); | |
64af2437 MD |
308 | |
309 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
310 | list_for_each_entry(chan, &session->chan, list) { |
311 | if (chan->channel_type != METADATA_CHANNEL) | |
312 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
313 | } | |
c0e31d2e MD |
314 | end: |
315 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 316 | return ret; |
c0e31d2e MD |
317 | } |
318 | ||
9616f0bf JD |
319 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
320 | { | |
321 | int ret = 0; | |
322 | struct lttng_channel *chan; | |
323 | struct lttng_event *event; | |
324 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
325 | struct lttng_metadata_stream *stream; | |
326 | ||
327 | mutex_lock(&sessions_mutex); | |
328 | if (!session->active) { | |
329 | ret = -EBUSY; | |
330 | goto end; | |
331 | } | |
332 | ||
333 | mutex_lock(&cache->lock); | |
334 | memset(cache->data, 0, cache->cache_alloc); | |
335 | cache->metadata_written = 0; | |
336 | cache->version++; | |
337 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
338 | stream->metadata_out = 0; | |
339 | stream->metadata_in = 0; | |
340 | } | |
341 | mutex_unlock(&cache->lock); | |
342 | ||
343 | session->metadata_dumped = 0; | |
344 | list_for_each_entry(chan, &session->chan, list) { | |
345 | chan->metadata_dumped = 0; | |
346 | } | |
347 | ||
348 | list_for_each_entry(event, &session->events, list) { | |
349 | event->metadata_dumped = 0; | |
350 | } | |
351 | ||
352 | ret = _lttng_session_metadata_statedump(session); | |
353 | ||
354 | end: | |
355 | mutex_unlock(&sessions_mutex); | |
356 | return ret; | |
357 | } | |
358 | ||
359 | ||
360 | ||
a90917c3 | 361 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 362 | { |
3c997079 | 363 | int ret = 0; |
e64957da | 364 | |
3c997079 MD |
365 | mutex_lock(&sessions_mutex); |
366 | if (channel->channel_type == METADATA_CHANNEL) { | |
367 | ret = -EPERM; | |
368 | goto end; | |
369 | } | |
370 | if (channel->enabled) { | |
371 | ret = -EEXIST; | |
372 | goto end; | |
373 | } | |
374 | /* Set transient enabler state to "enabled" */ | |
375 | channel->tstate = 1; | |
376 | lttng_session_sync_enablers(channel->session); | |
377 | /* Set atomically the state to "enabled" */ | |
d4fe3450 | 378 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
379 | end: |
380 | mutex_unlock(&sessions_mutex); | |
381 | return ret; | |
e64957da MD |
382 | } |
383 | ||
a90917c3 | 384 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 385 | { |
3c997079 | 386 | int ret = 0; |
e64957da | 387 | |
3c997079 MD |
388 | mutex_lock(&sessions_mutex); |
389 | if (channel->channel_type == METADATA_CHANNEL) { | |
390 | ret = -EPERM; | |
391 | goto end; | |
392 | } | |
393 | if (!channel->enabled) { | |
394 | ret = -EEXIST; | |
395 | goto end; | |
396 | } | |
397 | /* Set atomically the state to "disabled" */ | |
d4fe3450 | 398 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
399 | /* Set transient enabler state to "enabled" */ |
400 | channel->tstate = 0; | |
401 | lttng_session_sync_enablers(channel->session); | |
402 | end: | |
403 | mutex_unlock(&sessions_mutex); | |
404 | return ret; | |
e64957da MD |
405 | } |
406 | ||
a90917c3 | 407 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 408 | { |
3c997079 | 409 | int ret = 0; |
e64957da | 410 | |
3c997079 MD |
411 | mutex_lock(&sessions_mutex); |
412 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
413 | ret = -EPERM; | |
414 | goto end; | |
415 | } | |
416 | if (event->enabled) { | |
417 | ret = -EEXIST; | |
418 | goto end; | |
419 | } | |
a0493bef MD |
420 | switch (event->instrumentation) { |
421 | case LTTNG_KERNEL_TRACEPOINT: | |
422 | case LTTNG_KERNEL_SYSCALL: | |
423 | ret = -EINVAL; | |
424 | break; | |
425 | case LTTNG_KERNEL_KPROBE: | |
426 | case LTTNG_KERNEL_FUNCTION: | |
427 | case LTTNG_KERNEL_NOOP: | |
d4fe3450 | 428 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
429 | break; |
430 | case LTTNG_KERNEL_KRETPROBE: | |
431 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
432 | break; | |
433 | default: | |
434 | WARN_ON_ONCE(1); | |
435 | ret = -EINVAL; | |
436 | } | |
3c997079 MD |
437 | end: |
438 | mutex_unlock(&sessions_mutex); | |
439 | return ret; | |
e64957da MD |
440 | } |
441 | ||
a90917c3 | 442 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 443 | { |
3c997079 | 444 | int ret = 0; |
e64957da | 445 | |
3c997079 MD |
446 | mutex_lock(&sessions_mutex); |
447 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
448 | ret = -EPERM; | |
449 | goto end; | |
450 | } | |
451 | if (!event->enabled) { | |
452 | ret = -EEXIST; | |
453 | goto end; | |
454 | } | |
a0493bef MD |
455 | switch (event->instrumentation) { |
456 | case LTTNG_KERNEL_TRACEPOINT: | |
457 | case LTTNG_KERNEL_SYSCALL: | |
458 | ret = -EINVAL; | |
459 | break; | |
460 | case LTTNG_KERNEL_KPROBE: | |
461 | case LTTNG_KERNEL_FUNCTION: | |
462 | case LTTNG_KERNEL_NOOP: | |
d4fe3450 | 463 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
464 | break; |
465 | case LTTNG_KERNEL_KRETPROBE: | |
466 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
467 | break; | |
468 | default: | |
469 | WARN_ON_ONCE(1); | |
470 | ret = -EINVAL; | |
471 | } | |
3c997079 MD |
472 | end: |
473 | mutex_unlock(&sessions_mutex); | |
474 | return ret; | |
e64957da MD |
475 | } |
476 | ||
a90917c3 | 477 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 478 | { |
a90917c3 | 479 | struct lttng_transport *transport; |
f3d01b96 | 480 | |
a90917c3 | 481 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
482 | if (!strcmp(transport->name, name)) |
483 | return transport; | |
484 | } | |
485 | return NULL; | |
486 | } | |
487 | ||
a90917c3 | 488 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
489 | const char *transport_name, |
490 | void *buf_addr, | |
4e3c1b9b MD |
491 | size_t subbuf_size, size_t num_subbuf, |
492 | unsigned int switch_timer_interval, | |
d83004aa JD |
493 | unsigned int read_timer_interval, |
494 | enum channel_type channel_type) | |
4e3c1b9b | 495 | { |
a90917c3 MD |
496 | struct lttng_channel *chan; |
497 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
498 | |
499 | mutex_lock(&sessions_mutex); | |
d83004aa | 500 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 501 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 502 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
503 | if (!transport) { |
504 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
505 | transport_name); | |
c0e31d2e | 506 | goto notransport; |
f3d01b96 | 507 | } |
a33c9927 MD |
508 | if (!try_module_get(transport->owner)) { |
509 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
510 | goto notransport; | |
511 | } | |
a90917c3 | 512 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 513 | if (!chan) |
c0e31d2e | 514 | goto nomem; |
4e3c1b9b | 515 | chan->session = session; |
05d32c64 | 516 | chan->id = session->free_chan_id++; |
3b731ab1 | 517 | chan->ops = &transport->ops; |
125b4df4 MD |
518 | /* |
519 | * Note: the channel creation op already writes into the packet | |
520 | * headers. Therefore the "chan" information used as input | |
521 | * should be already accessible. | |
522 | */ | |
5f5ddf01 MD |
523 | chan->chan = transport->ops.channel_create(transport_name, |
524 | chan, buf_addr, subbuf_size, num_subbuf, | |
525 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
526 | if (!chan->chan) |
527 | goto create_error; | |
3c997079 | 528 | chan->tstate = 1; |
e64957da | 529 | chan->enabled = 1; |
a33c9927 | 530 | chan->transport = transport; |
d83004aa | 531 | chan->channel_type = channel_type; |
4e3c1b9b MD |
532 | list_add(&chan->list, &session->chan); |
533 | mutex_unlock(&sessions_mutex); | |
534 | return chan; | |
535 | ||
f3d01b96 MD |
536 | create_error: |
537 | kfree(chan); | |
c0e31d2e | 538 | nomem: |
a33c9927 MD |
539 | if (transport) |
540 | module_put(transport->owner); | |
c0e31d2e | 541 | notransport: |
e5382b6d | 542 | active: |
4e3c1b9b MD |
543 | mutex_unlock(&sessions_mutex); |
544 | return NULL; | |
545 | } | |
546 | ||
547 | /* | |
d83004aa JD |
548 | * Only used internally at session destruction for per-cpu channels, and |
549 | * when metadata channel is released. | |
550 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 551 | */ |
aa7c23a9 | 552 | static |
a90917c3 | 553 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 554 | { |
11b5a3c2 | 555 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 556 | module_put(chan->transport->owner); |
4e3c1b9b | 557 | list_del(&chan->list); |
8070f5c0 | 558 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
559 | kfree(chan); |
560 | } | |
561 | ||
d83004aa JD |
562 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
563 | { | |
564 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
565 | ||
566 | /* Protect the metadata cache with the sessions_mutex. */ | |
567 | mutex_lock(&sessions_mutex); | |
568 | _lttng_channel_destroy(chan); | |
569 | mutex_unlock(&sessions_mutex); | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
572 | ||
573 | static | |
574 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
575 | { | |
576 | stream->finalized = 1; | |
577 | wake_up_interruptible(&stream->read_wait); | |
578 | } | |
579 | ||
e5382b6d MD |
580 | /* |
581 | * Supports event creation while tracing session is active. | |
3c997079 | 582 | * Needs to be called with sessions mutex held. |
e5382b6d | 583 | */ |
3c997079 MD |
584 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
585 | struct lttng_kernel_event *event_param, | |
586 | void *filter, | |
587 | const struct lttng_event_desc *event_desc, | |
588 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 589 | { |
3c997079 | 590 | struct lttng_session *session = chan->session; |
a90917c3 | 591 | struct lttng_event *event; |
3c997079 MD |
592 | const char *event_name; |
593 | struct hlist_head *head; | |
594 | size_t name_len; | |
595 | uint32_t hash; | |
3d084699 | 596 | int ret; |
4e3c1b9b | 597 | |
abc0446a | 598 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 599 | ret = -EMFILE; |
e5382b6d | 600 | goto full; |
abc0446a | 601 | } |
3c997079 MD |
602 | |
603 | switch (itype) { | |
604 | case LTTNG_KERNEL_TRACEPOINT: | |
605 | event_name = event_desc->name; | |
606 | break; | |
607 | case LTTNG_KERNEL_KPROBE: | |
608 | case LTTNG_KERNEL_KRETPROBE: | |
609 | case LTTNG_KERNEL_FUNCTION: | |
610 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 611 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
612 | event_name = event_param->name; |
613 | break; | |
614 | default: | |
615 | WARN_ON_ONCE(1); | |
616 | ret = -EINVAL; | |
617 | goto type_error; | |
618 | } | |
619 | name_len = strlen(event_name); | |
620 | hash = jhash(event_name, name_len, 0); | |
621 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 622 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
623 | WARN_ON_ONCE(!event->desc); |
624 | if (!strncmp(event->desc->name, event_name, | |
625 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
626 | && chan == event->chan) { | |
627 | ret = -EEXIST; | |
628 | goto exist; | |
abc0446a MD |
629 | } |
630 | } | |
3c997079 | 631 | |
11b5a3c2 | 632 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 633 | if (!event) { |
4cf0bf51 | 634 | ret = -ENOMEM; |
4e3c1b9b | 635 | goto cache_error; |
abc0446a | 636 | } |
4e3c1b9b MD |
637 | event->chan = chan; |
638 | event->filter = filter; | |
e5382b6d | 639 | event->id = chan->free_event_id++; |
3c997079 MD |
640 | event->instrumentation = itype; |
641 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 642 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
643 | INIT_LIST_HEAD(&event->enablers_ref_head); |
644 | ||
645 | switch (itype) { | |
ab2277d6 | 646 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
647 | /* Event will be enabled by enabler sync. */ |
648 | event->enabled = 0; | |
649 | event->registered = 0; | |
650 | event->desc = lttng_event_get(event_name); | |
abc0446a | 651 | if (!event->desc) { |
4cf0bf51 | 652 | ret = -ENOENT; |
d3dbe23c | 653 | goto register_error; |
abc0446a | 654 | } |
3c997079 MD |
655 | /* Populate lttng_event structure before event registration. */ |
656 | smp_wmb(); | |
baf20995 | 657 | break; |
ab2277d6 | 658 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
659 | /* |
660 | * Needs to be explicitly enabled after creation, since | |
661 | * we may want to apply filters. | |
662 | */ | |
663 | event->enabled = 0; | |
3c997079 MD |
664 | event->registered = 1; |
665 | /* | |
666 | * Populate lttng_event structure before event | |
667 | * registration. | |
668 | */ | |
669 | smp_wmb(); | |
670 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
671 | event_param->u.kprobe.symbol_name, |
672 | event_param->u.kprobe.offset, | |
673 | event_param->u.kprobe.addr, | |
674 | event); | |
abc0446a | 675 | if (ret) { |
4cf0bf51 | 676 | ret = -EINVAL; |
d6d808f3 | 677 | goto register_error; |
abc0446a | 678 | } |
edeb3137 MD |
679 | ret = try_module_get(event->desc->owner); |
680 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 681 | break; |
7371f44c MD |
682 | case LTTNG_KERNEL_KRETPROBE: |
683 | { | |
a90917c3 | 684 | struct lttng_event *event_return; |
7371f44c MD |
685 | |
686 | /* kretprobe defines 2 events */ | |
a0493bef MD |
687 | /* |
688 | * Needs to be explicitly enabled after creation, since | |
689 | * we may want to apply filters. | |
690 | */ | |
691 | event->enabled = 0; | |
3c997079 | 692 | event->registered = 1; |
7371f44c MD |
693 | event_return = |
694 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 695 | if (!event_return) { |
4cf0bf51 | 696 | ret = -ENOMEM; |
7371f44c | 697 | goto register_error; |
abc0446a | 698 | } |
7371f44c MD |
699 | event_return->chan = chan; |
700 | event_return->filter = filter; | |
701 | event_return->id = chan->free_event_id++; | |
a0493bef | 702 | event_return->enabled = 0; |
3c997079 MD |
703 | event_return->registered = 1; |
704 | event_return->instrumentation = itype; | |
7371f44c | 705 | /* |
a90917c3 | 706 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
707 | */ |
708 | smp_wmb(); | |
3c997079 | 709 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
710 | event_param->u.kretprobe.symbol_name, |
711 | event_param->u.kretprobe.offset, | |
712 | event_param->u.kretprobe.addr, | |
713 | event, event_return); | |
714 | if (ret) { | |
715 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 716 | ret = -EINVAL; |
7371f44c MD |
717 | goto register_error; |
718 | } | |
719 | /* Take 2 refs on the module: one per event. */ | |
720 | ret = try_module_get(event->desc->owner); | |
721 | WARN_ON_ONCE(!ret); | |
722 | ret = try_module_get(event->desc->owner); | |
723 | WARN_ON_ONCE(!ret); | |
a90917c3 | 724 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 725 | event_return); |
abc0446a | 726 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
727 | if (ret) { |
728 | kmem_cache_free(event_cache, event_return); | |
729 | module_put(event->desc->owner); | |
730 | module_put(event->desc->owner); | |
731 | goto statedump_error; | |
732 | } | |
733 | list_add(&event_return->list, &chan->session->events); | |
734 | break; | |
735 | } | |
ab2277d6 | 736 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
737 | /* |
738 | * Needs to be explicitly enabled after creation, since | |
739 | * we may want to apply filters. | |
740 | */ | |
741 | event->enabled = 0; | |
3c997079 MD |
742 | event->registered = 1; |
743 | /* | |
744 | * Populate lttng_event structure before event | |
745 | * registration. | |
746 | */ | |
747 | smp_wmb(); | |
748 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
749 | event_param->u.ftrace.symbol_name, |
750 | event); | |
abc0446a | 751 | if (ret) { |
e0a7a7c4 | 752 | goto register_error; |
abc0446a | 753 | } |
edeb3137 MD |
754 | ret = try_module_get(event->desc->owner); |
755 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 756 | break; |
1ec65de1 | 757 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 758 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
759 | /* |
760 | * Needs to be explicitly enabled after creation, since | |
761 | * we may want to apply filters. | |
762 | */ | |
763 | event->enabled = 0; | |
3c997079 MD |
764 | event->registered = 0; |
765 | event->desc = event_desc; | |
abc0446a | 766 | if (!event->desc) { |
4cf0bf51 | 767 | ret = -EINVAL; |
259b6cb3 | 768 | goto register_error; |
abc0446a | 769 | } |
1ec65de1 | 770 | break; |
baf20995 MD |
771 | default: |
772 | WARN_ON_ONCE(1); | |
4cf0bf51 | 773 | ret = -EINVAL; |
df07930b | 774 | goto register_error; |
baf20995 | 775 | } |
a90917c3 | 776 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
777 | WARN_ON_ONCE(ret > 0); |
778 | if (ret) { | |
c099397a | 779 | goto statedump_error; |
abc0446a | 780 | } |
3c997079 | 781 | hlist_add_head(&event->hlist, head); |
dda6a249 | 782 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
783 | return event; |
784 | ||
c099397a | 785 | statedump_error: |
259b6cb3 | 786 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 787 | register_error: |
11b5a3c2 | 788 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
789 | cache_error: |
790 | exist: | |
3c997079 | 791 | type_error: |
e5382b6d | 792 | full: |
4cf0bf51 | 793 | return ERR_PTR(ret); |
4e3c1b9b MD |
794 | } |
795 | ||
3c997079 MD |
796 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
797 | struct lttng_kernel_event *event_param, | |
798 | void *filter, | |
799 | const struct lttng_event_desc *event_desc, | |
800 | enum lttng_kernel_instrumentation itype) | |
801 | { | |
802 | struct lttng_event *event; | |
803 | ||
804 | mutex_lock(&sessions_mutex); | |
805 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
806 | itype); | |
807 | mutex_unlock(&sessions_mutex); | |
808 | return event; | |
809 | } | |
810 | ||
811 | /* Only used for tracepoints for now. */ | |
812 | static | |
813 | void register_event(struct lttng_event *event) | |
814 | { | |
815 | const struct lttng_event_desc *desc; | |
f127e61e | 816 | int ret = -EINVAL; |
3c997079 | 817 | |
3c997079 MD |
818 | if (event->registered) |
819 | return; | |
4ecb5ad5 | 820 | |
3c997079 | 821 | desc = event->desc; |
4ecb5ad5 MD |
822 | switch (event->instrumentation) { |
823 | case LTTNG_KERNEL_TRACEPOINT: | |
824 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
825 | desc->probe_callback, | |
826 | event); | |
827 | break; | |
828 | case LTTNG_KERNEL_SYSCALL: | |
829 | ret = lttng_syscall_filter_enable(event->chan, | |
830 | desc->name); | |
831 | break; | |
832 | case LTTNG_KERNEL_KPROBE: | |
833 | case LTTNG_KERNEL_KRETPROBE: | |
834 | case LTTNG_KERNEL_FUNCTION: | |
835 | case LTTNG_KERNEL_NOOP: | |
836 | ret = 0; | |
837 | break; | |
838 | default: | |
839 | WARN_ON_ONCE(1); | |
840 | } | |
3c997079 MD |
841 | if (!ret) |
842 | event->registered = 1; | |
843 | } | |
844 | ||
4e3c1b9b MD |
845 | /* |
846 | * Only used internally at session destruction. | |
847 | */ | |
a90917c3 | 848 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 849 | { |
4ecb5ad5 | 850 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
851 | int ret = -EINVAL; |
852 | ||
3c997079 MD |
853 | if (!event->registered) |
854 | return 0; | |
855 | ||
4ecb5ad5 | 856 | desc = event->desc; |
38d024ae | 857 | switch (event->instrumentation) { |
ab2277d6 | 858 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 859 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 860 | event->desc->probe_callback, |
11b5a3c2 | 861 | event); |
baf20995 | 862 | break; |
ab2277d6 | 863 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 864 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
865 | ret = 0; |
866 | break; | |
7371f44c MD |
867 | case LTTNG_KERNEL_KRETPROBE: |
868 | lttng_kretprobes_unregister(event); | |
869 | ret = 0; | |
870 | break; | |
ab2277d6 | 871 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
872 | lttng_ftrace_unregister(event); |
873 | ret = 0; | |
874 | break; | |
33a39a3c | 875 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
876 | ret = lttng_syscall_filter_disable(event->chan, |
877 | desc->name); | |
878 | break; | |
879 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
880 | ret = 0; |
881 | break; | |
baf20995 MD |
882 | default: |
883 | WARN_ON_ONCE(1); | |
884 | } | |
3c997079 MD |
885 | if (!ret) |
886 | event->registered = 0; | |
dda6a249 MD |
887 | return ret; |
888 | } | |
889 | ||
890 | /* | |
891 | * Only used internally at session destruction. | |
892 | */ | |
be066e6c | 893 | static |
a90917c3 | 894 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 895 | { |
edeb3137 MD |
896 | switch (event->instrumentation) { |
897 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 898 | lttng_event_put(event->desc); |
edeb3137 MD |
899 | break; |
900 | case LTTNG_KERNEL_KPROBE: | |
901 | module_put(event->desc->owner); | |
902 | lttng_kprobes_destroy_private(event); | |
903 | break; | |
7371f44c MD |
904 | case LTTNG_KERNEL_KRETPROBE: |
905 | module_put(event->desc->owner); | |
906 | lttng_kretprobes_destroy_private(event); | |
907 | break; | |
edeb3137 MD |
908 | case LTTNG_KERNEL_FUNCTION: |
909 | module_put(event->desc->owner); | |
910 | lttng_ftrace_destroy_private(event); | |
911 | break; | |
259b6cb3 | 912 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 913 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 914 | break; |
edeb3137 MD |
915 | default: |
916 | WARN_ON_ONCE(1); | |
917 | } | |
dda6a249 | 918 | list_del(&event->list); |
8070f5c0 | 919 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 920 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
921 | } |
922 | ||
6599a4eb MD |
923 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
924 | enum tracker_type tracker_type) | |
e0130fab | 925 | { |
6599a4eb MD |
926 | switch (tracker_type) { |
927 | case TRACKER_PID: | |
928 | return &session->pid_tracker; | |
929 | case TRACKER_VPID: | |
930 | return &session->vpid_tracker; | |
931 | case TRACKER_UID: | |
932 | return &session->uid_tracker; | |
933 | case TRACKER_VUID: | |
934 | return &session->vuid_tracker; | |
935 | case TRACKER_GID: | |
936 | return &session->gid_tracker; | |
937 | case TRACKER_VGID: | |
938 | return &session->vgid_tracker; | |
939 | default: | |
940 | WARN_ON_ONCE(1); | |
941 | return NULL; | |
942 | } | |
943 | } | |
944 | ||
945 | int lttng_session_track_id(struct lttng_session *session, | |
946 | enum tracker_type tracker_type, int id) | |
947 | { | |
948 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
949 | int ret; |
950 | ||
6599a4eb MD |
951 | tracker = get_tracker(session, tracker_type); |
952 | if (!tracker) | |
953 | return -EINVAL; | |
954 | if (id < -1) | |
e0130fab MD |
955 | return -EINVAL; |
956 | mutex_lock(&sessions_mutex); | |
6599a4eb MD |
957 | if (id == -1) { |
958 | /* track all ids: destroy tracker. */ | |
959 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
960 | ret = 0; |
961 | } else { | |
6599a4eb | 962 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 963 | } |
e0130fab MD |
964 | mutex_unlock(&sessions_mutex); |
965 | return ret; | |
966 | } | |
967 | ||
6599a4eb MD |
968 | int lttng_session_untrack_id(struct lttng_session *session, |
969 | enum tracker_type tracker_type, int id) | |
e0130fab | 970 | { |
6599a4eb | 971 | struct lttng_id_tracker *tracker; |
e0130fab MD |
972 | int ret; |
973 | ||
6599a4eb MD |
974 | tracker = get_tracker(session, tracker_type); |
975 | if (!tracker) | |
976 | return -EINVAL; | |
977 | if (id < -1) | |
e0130fab MD |
978 | return -EINVAL; |
979 | mutex_lock(&sessions_mutex); | |
6599a4eb MD |
980 | if (id == -1) { |
981 | /* untrack all ids: replace by empty tracker. */ | |
982 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 983 | } else { |
6599a4eb | 984 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 985 | } |
e0130fab MD |
986 | mutex_unlock(&sessions_mutex); |
987 | return ret; | |
988 | } | |
989 | ||
7e6f9ef6 | 990 | static |
6599a4eb | 991 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 992 | { |
6599a4eb MD |
993 | struct lttng_id_tracker *id_tracker = m->private; |
994 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
995 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
996 | int iter = 0, i; |
997 | ||
998 | mutex_lock(&sessions_mutex); | |
6599a4eb MD |
999 | if (id_tracker_p) { |
1000 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1001 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1002 | |
f934e302 | 1003 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1004 | if (iter++ >= *pos) |
1005 | return e; | |
1006 | } | |
1007 | } | |
1008 | } else { | |
6599a4eb | 1009 | /* ID tracker disabled. */ |
7e6f9ef6 | 1010 | if (iter >= *pos && iter == 0) { |
6599a4eb | 1011 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1012 | } |
1013 | iter++; | |
1014 | } | |
1015 | /* End of list */ | |
1016 | return NULL; | |
1017 | } | |
1018 | ||
1019 | /* Called with sessions_mutex held. */ | |
1020 | static | |
6599a4eb | 1021 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1022 | { |
6599a4eb MD |
1023 | struct lttng_id_tracker *id_tracker = m->private; |
1024 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1025 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1026 | int iter = 0, i; |
1027 | ||
1028 | (*ppos)++; | |
6599a4eb MD |
1029 | if (id_tracker_p) { |
1030 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1031 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1032 | |
f934e302 | 1033 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1034 | if (iter++ >= *ppos) |
1035 | return e; | |
1036 | } | |
1037 | } | |
1038 | } else { | |
6599a4eb | 1039 | /* ID tracker disabled. */ |
7e6f9ef6 | 1040 | if (iter >= *ppos && iter == 0) |
6599a4eb | 1041 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1042 | iter++; |
1043 | } | |
1044 | ||
1045 | /* End of list */ | |
1046 | return NULL; | |
1047 | } | |
1048 | ||
1049 | static | |
6599a4eb | 1050 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1051 | { |
1052 | mutex_unlock(&sessions_mutex); | |
1053 | } | |
1054 | ||
1055 | static | |
6599a4eb | 1056 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1057 | { |
6599a4eb MD |
1058 | struct lttng_id_tracker *id_tracker = m->private; |
1059 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1060 | int id; | |
7e6f9ef6 | 1061 | |
6599a4eb | 1062 | if (p == id_tracker_p) { |
7e6f9ef6 | 1063 | /* Tracker disabled. */ |
6599a4eb | 1064 | id = -1; |
7e6f9ef6 | 1065 | } else { |
6599a4eb | 1066 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1067 | |
6599a4eb MD |
1068 | id = lttng_id_tracker_get_node_id(e); |
1069 | } | |
1070 | switch (id_tracker->tracker_type) { | |
1071 | case TRACKER_PID: | |
1072 | seq_printf(m, "process { pid = %d; };\n", id); | |
1073 | break; | |
1074 | case TRACKER_VPID: | |
1075 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1076 | break; | |
1077 | case TRACKER_UID: | |
1078 | seq_printf(m, "user { uid = %d; };\n", id); | |
1079 | break; | |
1080 | case TRACKER_VUID: | |
1081 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1082 | break; | |
1083 | case TRACKER_GID: | |
1084 | seq_printf(m, "group { gid = %d; };\n", id); | |
1085 | break; | |
1086 | case TRACKER_VGID: | |
1087 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1088 | break; | |
1089 | default: | |
1090 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1091 | } |
7e6f9ef6 MD |
1092 | return 0; |
1093 | } | |
1094 | ||
1095 | static | |
6599a4eb MD |
1096 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1097 | .start = id_list_start, | |
1098 | .next = id_list_next, | |
1099 | .stop = id_list_stop, | |
1100 | .show = id_list_show, | |
7e6f9ef6 MD |
1101 | }; |
1102 | ||
1103 | static | |
6599a4eb | 1104 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1105 | { |
6599a4eb | 1106 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1107 | } |
1108 | ||
1109 | static | |
6599a4eb | 1110 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1111 | { |
1112 | struct seq_file *m = file->private_data; | |
6599a4eb | 1113 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1114 | int ret; |
1115 | ||
6599a4eb | 1116 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1117 | ret = seq_release(inode, file); |
6599a4eb MD |
1118 | if (!ret) |
1119 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1120 | return ret; |
1121 | } | |
1122 | ||
6599a4eb | 1123 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1124 | .owner = THIS_MODULE, |
6599a4eb | 1125 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1126 | .read = seq_read, |
1127 | .llseek = seq_lseek, | |
6599a4eb | 1128 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1129 | }; |
1130 | ||
6599a4eb MD |
1131 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1132 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1133 | { |
6599a4eb | 1134 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1135 | struct seq_file *m; |
1136 | int file_fd, ret; | |
1137 | ||
1138 | file_fd = lttng_get_unused_fd(); | |
1139 | if (file_fd < 0) { | |
1140 | ret = file_fd; | |
1141 | goto fd_error; | |
1142 | } | |
1143 | ||
6599a4eb MD |
1144 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1145 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1146 | NULL, O_RDWR); |
6599a4eb MD |
1147 | if (IS_ERR(tracker_ids_list_file)) { |
1148 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1149 | goto file_error; |
1150 | } | |
9c1f4643 MD |
1151 | if (atomic_long_add_unless(&session->file->f_count, |
1152 | 1, INT_MAX) == INT_MAX) { | |
1153 | goto refcount_error; | |
1154 | } | |
6599a4eb | 1155 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1156 | if (ret < 0) |
1157 | goto open_error; | |
6599a4eb MD |
1158 | m = tracker_ids_list_file->private_data; |
1159 | ||
1160 | m->private = get_tracker(session, tracker_type); | |
1161 | BUG_ON(!m->private); | |
1162 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1163 | |
1164 | return file_fd; | |
1165 | ||
1166 | open_error: | |
9c1f4643 MD |
1167 | atomic_long_dec(&session->file->f_count); |
1168 | refcount_error: | |
6599a4eb | 1169 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1170 | file_error: |
1171 | put_unused_fd(file_fd); | |
1172 | fd_error: | |
1173 | return ret; | |
1174 | } | |
1175 | ||
3c997079 MD |
1176 | /* |
1177 | * Enabler management. | |
1178 | */ | |
1179 | static | |
4ecb5ad5 MD |
1180 | int lttng_match_enabler_wildcard(const char *desc_name, |
1181 | const char *name) | |
3c997079 | 1182 | { |
3c997079 | 1183 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1184 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1185 | return 0; |
1186 | return 1; | |
1187 | } | |
1188 | ||
1189 | static | |
4ecb5ad5 MD |
1190 | int lttng_match_enabler_name(const char *desc_name, |
1191 | const char *name) | |
3c997079 | 1192 | { |
4ecb5ad5 | 1193 | if (strcmp(desc_name, name)) |
3c997079 MD |
1194 | return 0; |
1195 | return 1; | |
1196 | } | |
1197 | ||
1198 | static | |
1199 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1200 | struct lttng_enabler *enabler) | |
1201 | { | |
4ecb5ad5 MD |
1202 | const char *desc_name, *enabler_name; |
1203 | ||
1204 | enabler_name = enabler->event_param.name; | |
1205 | switch (enabler->event_param.instrumentation) { | |
1206 | case LTTNG_KERNEL_TRACEPOINT: | |
1207 | desc_name = desc->name; | |
1208 | break; | |
1209 | case LTTNG_KERNEL_SYSCALL: | |
1210 | desc_name = desc->name; | |
1211 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1212 | desc_name += strlen("compat_"); | |
1213 | if (!strncmp(desc_name, "syscall_exit_", | |
1214 | strlen("syscall_exit_"))) { | |
1215 | desc_name += strlen("syscall_exit_"); | |
1216 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1217 | strlen("syscall_entry_"))) { | |
1218 | desc_name += strlen("syscall_entry_"); | |
1219 | } else { | |
1220 | WARN_ON_ONCE(1); | |
1221 | return -EINVAL; | |
1222 | } | |
1223 | break; | |
1224 | default: | |
1225 | WARN_ON_ONCE(1); | |
1226 | return -EINVAL; | |
1227 | } | |
3c997079 MD |
1228 | switch (enabler->type) { |
1229 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1230 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1231 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1232 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1233 | default: |
1234 | return -EINVAL; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | static | |
1239 | int lttng_event_match_enabler(struct lttng_event *event, | |
1240 | struct lttng_enabler *enabler) | |
1241 | { | |
33a39a3c MD |
1242 | if (enabler->event_param.instrumentation != event->instrumentation) |
1243 | return 0; | |
3c997079 MD |
1244 | if (lttng_desc_match_enabler(event->desc, enabler) |
1245 | && event->chan == enabler->chan) | |
1246 | return 1; | |
1247 | else | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static | |
1252 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1253 | struct lttng_enabler *enabler) | |
1254 | { | |
1255 | struct lttng_enabler_ref *enabler_ref; | |
1256 | ||
1257 | list_for_each_entry(enabler_ref, | |
1258 | &event->enablers_ref_head, node) { | |
1259 | if (enabler_ref->ref == enabler) | |
1260 | return enabler_ref; | |
1261 | } | |
1262 | return NULL; | |
1263 | } | |
1264 | ||
3c997079 | 1265 | static |
33a39a3c | 1266 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1267 | { |
1268 | struct lttng_session *session = enabler->chan->session; | |
1269 | struct lttng_probe_desc *probe_desc; | |
1270 | const struct lttng_event_desc *desc; | |
1271 | int i; | |
1272 | struct list_head *probe_list; | |
1273 | ||
1274 | probe_list = lttng_get_probe_list_head(); | |
1275 | /* | |
1276 | * For each probe event, if we find that a probe event matches | |
1277 | * our enabler, create an associated lttng_event if not | |
1278 | * already present. | |
1279 | */ | |
1280 | list_for_each_entry(probe_desc, probe_list, head) { | |
1281 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1282 | int found = 0; | |
1283 | struct hlist_head *head; | |
1284 | const char *event_name; | |
1285 | size_t name_len; | |
1286 | uint32_t hash; | |
1287 | struct lttng_event *event; | |
1288 | ||
1289 | desc = probe_desc->event_desc[i]; | |
1290 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1291 | continue; | |
1292 | event_name = desc->name; | |
1293 | name_len = strlen(event_name); | |
1294 | ||
1295 | /* | |
1296 | * Check if already created. | |
1297 | */ | |
1298 | hash = jhash(event_name, name_len, 0); | |
1299 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1300 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1301 | if (event->desc == desc |
1302 | && event->chan == enabler->chan) | |
1303 | found = 1; | |
1304 | } | |
1305 | if (found) | |
1306 | continue; | |
1307 | ||
1308 | /* | |
1309 | * We need to create an event for this | |
1310 | * event probe. | |
1311 | */ | |
1312 | event = _lttng_event_create(enabler->chan, | |
1313 | NULL, NULL, desc, | |
1314 | LTTNG_KERNEL_TRACEPOINT); | |
1315 | if (!event) { | |
1316 | printk(KERN_INFO "Unable to create event %s\n", | |
1317 | probe_desc->event_desc[i]->name); | |
1318 | } | |
1319 | } | |
1320 | } | |
1321 | } | |
1322 | ||
33a39a3c MD |
1323 | static |
1324 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1325 | { | |
1326 | int ret; | |
1327 | ||
1328 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1329 | WARN_ON_ONCE(ret); | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * Create struct lttng_event if it is missing and present in the list of | |
1334 | * tracepoint probes. | |
1335 | * Should be called with sessions mutex held. | |
1336 | */ | |
1337 | static | |
1338 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1339 | { | |
1340 | switch (enabler->event_param.instrumentation) { | |
1341 | case LTTNG_KERNEL_TRACEPOINT: | |
1342 | lttng_create_tracepoint_if_missing(enabler); | |
1343 | break; | |
1344 | case LTTNG_KERNEL_SYSCALL: | |
1345 | lttng_create_syscall_if_missing(enabler); | |
1346 | break; | |
1347 | default: | |
1348 | WARN_ON_ONCE(1); | |
1349 | break; | |
1350 | } | |
1351 | } | |
1352 | ||
3c997079 MD |
1353 | /* |
1354 | * Create events associated with an enabler (if not already present), | |
1355 | * and add backward reference from the event to the enabler. | |
1356 | * Should be called with sessions mutex held. | |
1357 | */ | |
1358 | static | |
1359 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1360 | { | |
1361 | struct lttng_session *session = enabler->chan->session; | |
1362 | struct lttng_event *event; | |
1363 | ||
1364 | /* First ensure that probe events are created for this enabler. */ | |
1365 | lttng_create_event_if_missing(enabler); | |
1366 | ||
1367 | /* For each event matching enabler in session event list. */ | |
1368 | list_for_each_entry(event, &session->events, list) { | |
1369 | struct lttng_enabler_ref *enabler_ref; | |
1370 | ||
1371 | if (!lttng_event_match_enabler(event, enabler)) | |
1372 | continue; | |
1373 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1374 | if (!enabler_ref) { | |
1375 | /* | |
1376 | * If no backward ref, create it. | |
1377 | * Add backward ref from event to enabler. | |
1378 | */ | |
1379 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1380 | if (!enabler_ref) | |
1381 | return -ENOMEM; | |
1382 | enabler_ref->ref = enabler; | |
1383 | list_add(&enabler_ref->node, | |
1384 | &event->enablers_ref_head); | |
1385 | } | |
1386 | ||
f127e61e MD |
1387 | /* |
1388 | * Link filter bytecodes if not linked yet. | |
1389 | */ | |
1390 | lttng_enabler_event_link_bytecode(event, enabler); | |
1391 | ||
3c997079 MD |
1392 | /* TODO: merge event context. */ |
1393 | } | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Called at module load: connect the probe on all enablers matching | |
1399 | * this event. | |
1400 | * Called with sessions lock held. | |
1401 | */ | |
1402 | int lttng_fix_pending_events(void) | |
1403 | { | |
1404 | struct lttng_session *session; | |
1405 | ||
1406 | list_for_each_entry(session, &sessions, list) | |
1407 | lttng_session_lazy_sync_enablers(session); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1412 | struct lttng_kernel_event *event_param, | |
1413 | struct lttng_channel *chan) | |
1414 | { | |
1415 | struct lttng_enabler *enabler; | |
1416 | ||
1417 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1418 | if (!enabler) | |
1419 | return NULL; | |
1420 | enabler->type = type; | |
07dfc1d0 | 1421 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1422 | memcpy(&enabler->event_param, event_param, |
1423 | sizeof(enabler->event_param)); | |
1424 | enabler->chan = chan; | |
1425 | /* ctx left NULL */ | |
4fd19d8a | 1426 | enabler->enabled = 0; |
3c997079 MD |
1427 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1428 | mutex_lock(&sessions_mutex); | |
1429 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1430 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1431 | mutex_unlock(&sessions_mutex); | |
1432 | return enabler; | |
1433 | } | |
1434 | ||
1435 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1436 | { | |
1437 | mutex_lock(&sessions_mutex); | |
1438 | enabler->enabled = 1; | |
1439 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1440 | mutex_unlock(&sessions_mutex); | |
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1445 | { | |
1446 | mutex_lock(&sessions_mutex); | |
1447 | enabler->enabled = 0; | |
1448 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1449 | mutex_unlock(&sessions_mutex); | |
1450 | return 0; | |
1451 | } | |
1452 | ||
07dfc1d0 MD |
1453 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1454 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1455 | { | |
1456 | struct lttng_filter_bytecode_node *bytecode_node; | |
1457 | uint32_t bytecode_len; | |
1458 | int ret; | |
1459 | ||
1460 | ret = get_user(bytecode_len, &bytecode->len); | |
1461 | if (ret) | |
1462 | return ret; | |
1463 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1464 | GFP_KERNEL); | |
1465 | if (!bytecode_node) | |
1466 | return -ENOMEM; | |
1467 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1468 | sizeof(*bytecode) + bytecode_len); | |
1469 | if (ret) | |
1470 | goto error_free; | |
1471 | bytecode_node->enabler = enabler; | |
1472 | /* Enforce length based on allocated size */ | |
1473 | bytecode_node->bc.len = bytecode_len; | |
1474 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1475 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1476 | return 0; | |
1477 | ||
1478 | error_free: | |
1479 | kfree(bytecode_node); | |
1480 | return ret; | |
1481 | } | |
1482 | ||
3c997079 MD |
1483 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1484 | struct lttng_kernel_context *context_param) | |
1485 | { | |
1486 | return -ENOSYS; | |
1487 | } | |
1488 | ||
1489 | static | |
1490 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1491 | { | |
07dfc1d0 MD |
1492 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1493 | ||
1494 | /* Destroy filter bytecode */ | |
1495 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1496 | &enabler->filter_bytecode_head, node) { | |
1497 | kfree(filter_node); | |
1498 | } | |
1499 | ||
3c997079 MD |
1500 | /* Destroy contexts */ |
1501 | lttng_destroy_context(enabler->ctx); | |
1502 | ||
1503 | list_del(&enabler->node); | |
1504 | kfree(enabler); | |
1505 | } | |
1506 | ||
1507 | /* | |
1508 | * lttng_session_sync_enablers should be called just before starting a | |
1509 | * session. | |
1510 | * Should be called with sessions mutex held. | |
1511 | */ | |
1512 | static | |
1513 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1514 | { | |
1515 | struct lttng_enabler *enabler; | |
1516 | struct lttng_event *event; | |
1517 | ||
1518 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1519 | lttng_enabler_ref_events(enabler); | |
1520 | /* | |
1521 | * For each event, if at least one of its enablers is enabled, | |
1522 | * and its channel and session transient states are enabled, we | |
1523 | * enable the event, else we disable it. | |
1524 | */ | |
1525 | list_for_each_entry(event, &session->events, list) { | |
1526 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1527 | struct lttng_bytecode_runtime *runtime; |
1528 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1529 | |
4ecb5ad5 MD |
1530 | switch (event->instrumentation) { |
1531 | case LTTNG_KERNEL_TRACEPOINT: | |
1532 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1533 | /* Enable events */ |
1534 | list_for_each_entry(enabler_ref, | |
1535 | &event->enablers_ref_head, node) { | |
1536 | if (enabler_ref->ref->enabled) { | |
1537 | enabled = 1; | |
1538 | break; | |
1539 | } | |
1540 | } | |
4ecb5ad5 MD |
1541 | break; |
1542 | default: | |
3c997079 MD |
1543 | /* Not handled with lazy sync. */ |
1544 | continue; | |
1545 | } | |
1546 | /* | |
1547 | * Enabled state is based on union of enablers, with | |
1548 | * intesection of session and channel transient enable | |
1549 | * states. | |
1550 | */ | |
1551 | enabled = enabled && session->tstate && event->chan->tstate; | |
1552 | ||
d4fe3450 | 1553 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1554 | /* |
1555 | * Sync tracepoint registration with event enabled | |
1556 | * state. | |
1557 | */ | |
1558 | if (enabled) { | |
1559 | register_event(event); | |
1560 | } else { | |
1561 | _lttng_event_unregister(event); | |
1562 | } | |
07dfc1d0 MD |
1563 | |
1564 | /* Check if has enablers without bytecode enabled */ | |
1565 | list_for_each_entry(enabler_ref, | |
1566 | &event->enablers_ref_head, node) { | |
1567 | if (enabler_ref->ref->enabled | |
1568 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1569 | has_enablers_without_bytecode = 1; | |
1570 | break; | |
1571 | } | |
1572 | } | |
1573 | event->has_enablers_without_bytecode = | |
1574 | has_enablers_without_bytecode; | |
1575 | ||
1576 | /* Enable filters */ | |
1577 | list_for_each_entry(runtime, | |
f127e61e | 1578 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1579 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1580 | } |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * Apply enablers to session events, adding events to session if need | |
1585 | * be. It is required after each modification applied to an active | |
1586 | * session, and right before session "start". | |
1587 | * "lazy" sync means we only sync if required. | |
1588 | * Should be called with sessions mutex held. | |
1589 | */ | |
1590 | static | |
1591 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1592 | { | |
1593 | /* We can skip if session is not active */ | |
1594 | if (!session->active) | |
1595 | return; | |
1596 | lttng_session_sync_enablers(session); | |
1597 | } | |
1598 | ||
1ec3f75a | 1599 | /* |
d83004aa JD |
1600 | * Serialize at most one packet worth of metadata into a metadata |
1601 | * channel. | |
92d9f5e6 MD |
1602 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1603 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1604 | * allows us to do racy operations such as looking for remaining space left in | |
1605 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1606 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1607 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1608 | * Returns the number of bytes written in the channel, 0 if no data |
1609 | * was written and a negative value on error. | |
1ec3f75a | 1610 | */ |
b3b8072b MD |
1611 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1612 | struct channel *chan) | |
d83004aa JD |
1613 | { |
1614 | struct lib_ring_buffer_ctx ctx; | |
1615 | int ret = 0; | |
1616 | size_t len, reserve_len; | |
1617 | ||
f613e3e6 | 1618 | /* |
92d9f5e6 MD |
1619 | * Ensure we support mutiple get_next / put sequences followed by |
1620 | * put_next. The metadata cache lock protects reading the metadata | |
1621 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1622 | * "flush" operations on the buffer invoked by different processes. | |
1623 | * Moreover, since the metadata cache memory can be reallocated, we | |
1624 | * need to have exclusive access against updates even though we only | |
1625 | * read it. | |
f613e3e6 | 1626 | */ |
92d9f5e6 | 1627 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1628 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1629 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1630 | goto end; |
f613e3e6 | 1631 | |
9616f0bf JD |
1632 | /* Metadata regenerated, change the version. */ |
1633 | if (stream->metadata_cache->version != stream->version) | |
1634 | stream->version = stream->metadata_cache->version; | |
1635 | ||
d83004aa | 1636 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1637 | stream->metadata_in; |
9de2c215 | 1638 | if (!len) |
de23d59d | 1639 | goto end; |
d83004aa | 1640 | reserve_len = min_t(size_t, |
b3b8072b | 1641 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1642 | len); |
b3b8072b | 1643 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1644 | sizeof(char), -1); |
1645 | /* | |
1646 | * If reservation failed, return an error to the caller. | |
1647 | */ | |
b3b8072b | 1648 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1649 | if (ret != 0) { |
1650 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1651 | goto end; | |
1652 | } | |
b3b8072b | 1653 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1654 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1655 | reserve_len); |
b3b8072b | 1656 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1657 | stream->metadata_in += reserve_len; |
d83004aa JD |
1658 | ret = reserve_len; |
1659 | ||
1660 | end: | |
92d9f5e6 | 1661 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1662 | return ret; |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * Write the metadata to the metadata cache. | |
1667 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1668 | * The metadata cache lock protects us from concurrent read access from |
1669 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1670 | */ |
a90917c3 | 1671 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1672 | const char *fmt, ...) |
1673 | { | |
c099397a | 1674 | char *str; |
d83004aa | 1675 | size_t len; |
c099397a | 1676 | va_list ap; |
d83004aa | 1677 | struct lttng_metadata_stream *stream; |
c099397a | 1678 | |
d4fe3450 | 1679 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1680 | |
1681 | va_start(ap, fmt); | |
1682 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1683 | va_end(ap); | |
1684 | if (!str) | |
1685 | return -ENOMEM; | |
1686 | ||
1ec3f75a | 1687 | len = strlen(str); |
92d9f5e6 | 1688 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1689 | if (session->metadata_cache->metadata_written + len > |
1690 | session->metadata_cache->cache_alloc) { | |
1691 | char *tmp_cache_realloc; | |
1692 | unsigned int tmp_cache_alloc_size; | |
1693 | ||
1694 | tmp_cache_alloc_size = max_t(unsigned int, | |
1695 | session->metadata_cache->cache_alloc + len, | |
1696 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1697 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1698 | if (!tmp_cache_realloc) |
1699 | goto err; | |
a606b6e8 ML |
1700 | if (session->metadata_cache->data) { |
1701 | memcpy(tmp_cache_realloc, | |
1702 | session->metadata_cache->data, | |
1703 | session->metadata_cache->cache_alloc); | |
1704 | vfree(session->metadata_cache->data); | |
1705 | } | |
1706 | ||
d83004aa JD |
1707 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1708 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1709 | } |
d83004aa JD |
1710 | memcpy(session->metadata_cache->data + |
1711 | session->metadata_cache->metadata_written, | |
1712 | str, len); | |
1713 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1714 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1715 | kfree(str); |
d83004aa JD |
1716 | |
1717 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1718 | wake_up_interruptible(&stream->read_wait); | |
1719 | ||
1720 | return 0; | |
1721 | ||
1722 | err: | |
92d9f5e6 | 1723 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1724 | kfree(str); |
1725 | return -ENOMEM; | |
c099397a MD |
1726 | } |
1727 | ||
f513b2bf MD |
1728 | static |
1729 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1730 | { | |
1731 | size_t i; | |
1732 | ||
1733 | for (i = 0; i < nesting; i++) { | |
1734 | int ret; | |
1735 | ||
1736 | ret = lttng_metadata_printf(session, " "); | |
1737 | if (ret) { | |
1738 | return ret; | |
1739 | } | |
1740 | } | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | /* | |
1745 | * Must be called with sessions_mutex held. | |
1746 | */ | |
1747 | static | |
1748 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1749 | const struct lttng_type *type, | |
1750 | size_t nesting) | |
1751 | { | |
1752 | int ret; | |
1753 | uint32_t i, nr_fields; | |
1754 | ||
1755 | ret = print_tabs(session, nesting); | |
1756 | if (ret) | |
1757 | return ret; | |
1758 | ret = lttng_metadata_printf(session, | |
1759 | "struct {\n"); | |
1760 | if (ret) | |
1761 | return ret; | |
1762 | nr_fields = type->u._struct.nr_fields; | |
1763 | for (i = 0; i < nr_fields; i++) { | |
1764 | const struct lttng_event_field *iter_field; | |
1765 | ||
1766 | iter_field = &type->u._struct.fields[i]; | |
1767 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1768 | if (ret) | |
1769 | return ret; | |
1770 | } | |
1771 | ret = print_tabs(session, nesting); | |
1772 | if (ret) | |
1773 | return ret; | |
1774 | ret = lttng_metadata_printf(session, | |
1775 | "}"); | |
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | /* | |
1780 | * Must be called with sessions_mutex held. | |
1781 | */ | |
1782 | static | |
1783 | int _lttng_struct_statedump(struct lttng_session *session, | |
1784 | const struct lttng_event_field *field, | |
1785 | size_t nesting) | |
1786 | { | |
1787 | int ret; | |
1788 | ||
1789 | ret = _lttng_struct_type_statedump(session, | |
1790 | &field->type, nesting); | |
1791 | if (ret) | |
1792 | return ret; | |
1793 | ret = lttng_metadata_printf(session, | |
1794 | "_%s;\n", | |
1795 | field->name); | |
1796 | return ret; | |
1797 | } | |
1798 | ||
65c85aa6 MD |
1799 | /* |
1800 | * Must be called with sessions_mutex held. | |
1801 | */ | |
1802 | static | |
1803 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1804 | const struct lttng_type *type, | |
1805 | size_t nesting) | |
1806 | { | |
1807 | int ret; | |
1808 | uint32_t i, nr_choices; | |
1809 | ||
1810 | ret = print_tabs(session, nesting); | |
1811 | if (ret) | |
1812 | return ret; | |
1813 | ret = lttng_metadata_printf(session, | |
1814 | "variant <_%s> {\n", | |
1815 | type->u.variant.tag_name); | |
1816 | if (ret) | |
1817 | return ret; | |
1818 | nr_choices = type->u.variant.nr_choices; | |
1819 | for (i = 0; i < nr_choices; i++) { | |
1820 | const struct lttng_event_field *iter_field; | |
1821 | ||
1822 | iter_field = &type->u.variant.choices[i]; | |
1823 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1824 | if (ret) | |
1825 | return ret; | |
1826 | } | |
1827 | ret = print_tabs(session, nesting); | |
1828 | if (ret) | |
1829 | return ret; | |
1830 | ret = lttng_metadata_printf(session, | |
1831 | "}"); | |
1832 | return ret; | |
1833 | } | |
1834 | ||
1835 | /* | |
1836 | * Must be called with sessions_mutex held. | |
1837 | */ | |
1838 | static | |
1839 | int _lttng_variant_statedump(struct lttng_session *session, | |
1840 | const struct lttng_event_field *field, | |
1841 | size_t nesting) | |
1842 | { | |
1843 | int ret; | |
1844 | ||
1845 | ret = _lttng_variant_type_statedump(session, | |
1846 | &field->type, nesting); | |
1847 | if (ret) | |
1848 | return ret; | |
1849 | ret = lttng_metadata_printf(session, | |
1850 | "_%s;\n", | |
1851 | field->name); | |
1852 | return ret; | |
1853 | } | |
1854 | ||
f513b2bf MD |
1855 | /* |
1856 | * Must be called with sessions_mutex held. | |
1857 | */ | |
1858 | static | |
1859 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1860 | const struct lttng_event_field *field, | |
1861 | size_t nesting) | |
1862 | { | |
1863 | int ret; | |
1864 | const struct lttng_type *elem_type; | |
1865 | ||
65c85aa6 | 1866 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1867 | elem_type = field->type.u.array_compound.elem_type; |
1868 | switch (elem_type->atype) { | |
1869 | case atype_struct: | |
1870 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1871 | if (ret) | |
1872 | return ret; | |
1873 | break; | |
65c85aa6 MD |
1874 | case atype_variant: |
1875 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1876 | if (ret) | |
1877 | return ret; | |
1878 | break; | |
f513b2bf MD |
1879 | default: |
1880 | return -EINVAL; | |
1881 | } | |
1882 | ret = lttng_metadata_printf(session, | |
1883 | " _%s[%u];\n", | |
1884 | field->name, | |
1885 | field->type.u.array_compound.length); | |
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | /* | |
1890 | * Must be called with sessions_mutex held. | |
1891 | */ | |
1892 | static | |
1893 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1894 | const struct lttng_event_field *field, | |
1895 | size_t nesting) | |
1896 | { | |
1897 | int ret; | |
1898 | const char *length_name; | |
1899 | const struct lttng_type *elem_type; | |
1900 | ||
1901 | length_name = field->type.u.sequence_compound.length_name; | |
1902 | ||
65c85aa6 | 1903 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1904 | elem_type = field->type.u.sequence_compound.elem_type; |
1905 | switch (elem_type->atype) { | |
1906 | case atype_struct: | |
1907 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1908 | if (ret) | |
1909 | return ret; | |
1910 | break; | |
65c85aa6 MD |
1911 | case atype_variant: |
1912 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1913 | if (ret) | |
1914 | return ret; | |
1915 | break; | |
f513b2bf MD |
1916 | default: |
1917 | return -EINVAL; | |
1918 | } | |
1919 | ret = lttng_metadata_printf(session, | |
1920 | " _%s[ _%s ];\n", | |
1921 | field->name, | |
1922 | length_name); | |
1923 | return ret; | |
1924 | } | |
1925 | ||
141ddf28 MD |
1926 | /* |
1927 | * Must be called with sessions_mutex held. | |
1928 | */ | |
1929 | static | |
1930 | int _lttng_enum_statedump(struct lttng_session *session, | |
1931 | const struct lttng_event_field *field, | |
1932 | size_t nesting) | |
1933 | { | |
1934 | const struct lttng_enum_desc *enum_desc; | |
1935 | const struct lttng_integer_type *container_type; | |
1936 | int ret; | |
1937 | unsigned int i, nr_entries; | |
1938 | ||
1939 | enum_desc = field->type.u.basic.enumeration.desc; | |
1940 | container_type = &field->type.u.basic.enumeration.container_type; | |
1941 | nr_entries = enum_desc->nr_entries; | |
1942 | ||
1943 | ret = print_tabs(session, nesting); | |
1944 | if (ret) | |
1945 | goto end; | |
1946 | ret = lttng_metadata_printf(session, | |
578e68ec | 1947 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1948 | container_type->size, |
1949 | container_type->alignment, | |
1950 | container_type->signedness, | |
1951 | (container_type->encoding == lttng_encode_none) | |
1952 | ? "none" | |
1953 | : (container_type->encoding == lttng_encode_UTF8) | |
1954 | ? "UTF8" | |
1955 | : "ASCII", | |
578e68ec GB |
1956 | container_type->base, |
1957 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1958 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1959 | #else | |
1960 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1961 | #endif | |
1962 | ); | |
141ddf28 MD |
1963 | if (ret) |
1964 | goto end; | |
1965 | /* Dump all entries */ | |
1966 | for (i = 0; i < nr_entries; i++) { | |
1967 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1968 | int j, len; | |
1969 | ||
1970 | ret = print_tabs(session, nesting + 1); | |
1971 | if (ret) | |
1972 | goto end; | |
1973 | ret = lttng_metadata_printf(session, | |
1974 | "\""); | |
1975 | if (ret) | |
1976 | goto end; | |
1977 | len = strlen(entry->string); | |
1978 | /* Escape the character '"' */ | |
1979 | for (j = 0; j < len; j++) { | |
1980 | char c = entry->string[j]; | |
1981 | ||
1982 | switch (c) { | |
1983 | case '"': | |
1984 | ret = lttng_metadata_printf(session, | |
1985 | "\\\""); | |
1986 | break; | |
1987 | case '\\': | |
1988 | ret = lttng_metadata_printf(session, | |
1989 | "\\\\"); | |
1990 | break; | |
1991 | default: | |
1992 | ret = lttng_metadata_printf(session, | |
1993 | "%c", c); | |
1994 | break; | |
1995 | } | |
1996 | if (ret) | |
1997 | goto end; | |
1998 | } | |
08ad1061 PP |
1999 | ret = lttng_metadata_printf(session, "\""); |
2000 | if (ret) | |
2001 | goto end; | |
2002 | ||
2003 | if (entry->options.is_auto) { | |
2004 | ret = lttng_metadata_printf(session, ",\n"); | |
2005 | if (ret) | |
2006 | goto end; | |
141ddf28 | 2007 | } else { |
7c559490 MD |
2008 | ret = lttng_metadata_printf(session, |
2009 | " = "); | |
2010 | if (ret) | |
2011 | goto end; | |
2012 | if (entry->start.signedness) | |
141ddf28 | 2013 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2014 | "%lld", (long long) entry->start.value); |
2015 | else | |
2016 | ret = lttng_metadata_printf(session, | |
2017 | "%llu", entry->start.value); | |
2018 | if (ret) | |
2019 | goto end; | |
2020 | if (entry->start.signedness == entry->end.signedness && | |
2021 | entry->start.value | |
2022 | == entry->end.value) { | |
141ddf28 | 2023 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2024 | ",\n"); |
2025 | } else { | |
2026 | if (entry->end.signedness) { | |
2027 | ret = lttng_metadata_printf(session, | |
2028 | " ... %lld,\n", | |
2029 | (long long) entry->end.value); | |
2030 | } else { | |
2031 | ret = lttng_metadata_printf(session, | |
2032 | " ... %llu,\n", | |
2033 | entry->end.value); | |
2034 | } | |
141ddf28 | 2035 | } |
7c559490 MD |
2036 | if (ret) |
2037 | goto end; | |
141ddf28 | 2038 | } |
141ddf28 MD |
2039 | } |
2040 | ret = print_tabs(session, nesting); | |
2041 | if (ret) | |
2042 | goto end; | |
2043 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2044 | field->name); | |
2045 | end: | |
2046 | return ret; | |
2047 | } | |
2048 | ||
d83004aa JD |
2049 | /* |
2050 | * Must be called with sessions_mutex held. | |
2051 | */ | |
c099397a | 2052 | static |
a90917c3 | 2053 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2054 | const struct lttng_event_field *field, |
2055 | size_t nesting) | |
c099397a | 2056 | { |
c099397a | 2057 | int ret = 0; |
c099397a | 2058 | |
8070f5c0 MD |
2059 | switch (field->type.atype) { |
2060 | case atype_integer: | |
f513b2bf MD |
2061 | ret = print_tabs(session, nesting); |
2062 | if (ret) | |
2063 | return ret; | |
8070f5c0 | 2064 | ret = lttng_metadata_printf(session, |
f513b2bf | 2065 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2066 | field->type.u.basic.integer.size, |
2067 | field->type.u.basic.integer.alignment, | |
2068 | field->type.u.basic.integer.signedness, | |
2069 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2070 | ? "none" | |
2071 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2072 | ? "UTF8" | |
2073 | : "ASCII", | |
2074 | field->type.u.basic.integer.base, | |
5214fa50 | 2075 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2076 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2077 | #else |
8070f5c0 | 2078 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2079 | #endif |
8070f5c0 MD |
2080 | field->name); |
2081 | break; | |
2082 | case atype_enum: | |
141ddf28 | 2083 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2084 | break; |
2085 | case atype_array: | |
2086 | { | |
2087 | const struct lttng_basic_type *elem_type; | |
2088 | ||
2089 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2090 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2091 | ret = print_tabs(session, nesting); |
2092 | if (ret) | |
2093 | return ret; | |
43803cf2 | 2094 | ret = lttng_metadata_printf(session, |
f513b2bf | 2095 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2096 | field->type.u.array.elem_alignment * CHAR_BIT, |
2097 | field->name); | |
2098 | if (ret) | |
2099 | return ret; | |
2100 | } | |
f513b2bf MD |
2101 | ret = print_tabs(session, nesting); |
2102 | if (ret) | |
2103 | return ret; | |
8070f5c0 | 2104 | ret = lttng_metadata_printf(session, |
f513b2bf | 2105 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2106 | elem_type->u.basic.integer.size, |
2107 | elem_type->u.basic.integer.alignment, | |
2108 | elem_type->u.basic.integer.signedness, | |
2109 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2110 | ? "none" | |
2111 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2112 | ? "UTF8" | |
2113 | : "ASCII", | |
2114 | elem_type->u.basic.integer.base, | |
5214fa50 | 2115 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2116 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2117 | #else |
8070f5c0 | 2118 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2119 | #endif |
8070f5c0 MD |
2120 | field->name, field->type.u.array.length); |
2121 | break; | |
2122 | } | |
2123 | case atype_sequence: | |
2124 | { | |
2125 | const struct lttng_basic_type *elem_type; | |
2126 | const struct lttng_basic_type *length_type; | |
2127 | ||
2128 | elem_type = &field->type.u.sequence.elem_type; | |
2129 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2130 | ret = print_tabs(session, nesting); |
2131 | if (ret) | |
2132 | return ret; | |
8070f5c0 | 2133 | ret = lttng_metadata_printf(session, |
f513b2bf | 2134 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2135 | length_type->u.basic.integer.size, |
32257272 | 2136 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2137 | length_type->u.basic.integer.signedness, |
2138 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2139 | ? "none" | |
0635cdd4 | 2140 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2141 | ? "UTF8" |
0635cdd4 | 2142 | : "ASCII"), |
8070f5c0 | 2143 | length_type->u.basic.integer.base, |
5214fa50 | 2144 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2145 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2146 | #else |
0635cdd4 | 2147 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2148 | #endif |
27d2368e MD |
2149 | field->name); |
2150 | if (ret) | |
2151 | return ret; | |
2152 | ||
43803cf2 | 2153 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2154 | ret = print_tabs(session, nesting); |
2155 | if (ret) | |
2156 | return ret; | |
43803cf2 | 2157 | ret = lttng_metadata_printf(session, |
f513b2bf | 2158 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2159 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2160 | field->name); | |
2161 | if (ret) | |
2162 | return ret; | |
2163 | } | |
f513b2bf MD |
2164 | ret = print_tabs(session, nesting); |
2165 | if (ret) | |
2166 | return ret; | |
27d2368e | 2167 | ret = lttng_metadata_printf(session, |
f513b2bf | 2168 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2169 | elem_type->u.basic.integer.size, |
32257272 | 2170 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2171 | elem_type->u.basic.integer.signedness, |
2172 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2173 | ? "none" | |
0635cdd4 | 2174 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2175 | ? "UTF8" |
0635cdd4 | 2176 | : "ASCII"), |
8070f5c0 | 2177 | elem_type->u.basic.integer.base, |
5214fa50 | 2178 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2179 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2180 | #else |
8070f5c0 | 2181 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2182 | #endif |
8070f5c0 | 2183 | field->name, |
27d2368e | 2184 | field->name); |
8070f5c0 MD |
2185 | break; |
2186 | } | |
c099397a | 2187 | |
8070f5c0 MD |
2188 | case atype_string: |
2189 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2190 | ret = print_tabs(session, nesting); |
2191 | if (ret) | |
2192 | return ret; | |
8070f5c0 | 2193 | ret = lttng_metadata_printf(session, |
f513b2bf | 2194 | "string%s _%s;\n", |
8070f5c0 MD |
2195 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2196 | " { encoding = ASCII; }" : "", | |
2197 | field->name); | |
2198 | break; | |
f513b2bf MD |
2199 | case atype_struct: |
2200 | ret = _lttng_struct_statedump(session, field, nesting); | |
2201 | break; | |
2202 | case atype_array_compound: | |
2203 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2204 | break; | |
2205 | case atype_sequence_compound: | |
2206 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2207 | break; | |
65c85aa6 MD |
2208 | case atype_variant: |
2209 | ret = _lttng_variant_statedump(session, field, nesting); | |
2210 | break; | |
f513b2bf | 2211 | |
8070f5c0 MD |
2212 | default: |
2213 | WARN_ON_ONCE(1); | |
2214 | return -EINVAL; | |
2215 | } | |
2216 | return ret; | |
2217 | } | |
2218 | ||
2219 | static | |
a90917c3 | 2220 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2221 | struct lttng_ctx *ctx) |
2222 | { | |
2223 | int ret = 0; | |
2224 | int i; | |
2225 | ||
2226 | if (!ctx) | |
2227 | return 0; | |
2228 | for (i = 0; i < ctx->nr_fields; i++) { | |
2229 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2230 | ||
f513b2bf | 2231 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2232 | if (ret) |
2233 | return ret; | |
2234 | } | |
2235 | return ret; | |
2236 | } | |
2237 | ||
2238 | static | |
a90917c3 MD |
2239 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2240 | struct lttng_event *event) | |
8070f5c0 MD |
2241 | { |
2242 | const struct lttng_event_desc *desc = event->desc; | |
2243 | int ret = 0; | |
2244 | int i; | |
2245 | ||
2246 | for (i = 0; i < desc->nr_fields; i++) { | |
2247 | const struct lttng_event_field *field = &desc->fields[i]; | |
2248 | ||
f513b2bf | 2249 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2250 | if (ret) |
2251 | return ret; | |
c099397a MD |
2252 | } |
2253 | return ret; | |
2254 | } | |
2255 | ||
d83004aa JD |
2256 | /* |
2257 | * Must be called with sessions_mutex held. | |
2258 | */ | |
c099397a | 2259 | static |
a90917c3 MD |
2260 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2261 | struct lttng_channel *chan, | |
2262 | struct lttng_event *event) | |
c099397a MD |
2263 | { |
2264 | int ret = 0; | |
2265 | ||
d4fe3450 | 2266 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2267 | return 0; |
d83004aa | 2268 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2269 | return 0; |
2270 | ||
2271 | ret = lttng_metadata_printf(session, | |
2272 | "event {\n" | |
ae734547 | 2273 | " name = \"%s\";\n" |
c099397a | 2274 | " id = %u;\n" |
b9074a1b | 2275 | " stream_id = %u;\n", |
c099397a MD |
2276 | event->desc->name, |
2277 | event->id, | |
2278 | event->chan->id); | |
2279 | if (ret) | |
2280 | goto end; | |
2281 | ||
b9074a1b MD |
2282 | if (event->ctx) { |
2283 | ret = lttng_metadata_printf(session, | |
2284 | " context := struct {\n"); | |
2285 | if (ret) | |
2286 | goto end; | |
2287 | } | |
a90917c3 | 2288 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2289 | if (ret) |
2290 | goto end; | |
b9074a1b MD |
2291 | if (event->ctx) { |
2292 | ret = lttng_metadata_printf(session, | |
2293 | " };\n"); | |
2294 | if (ret) | |
2295 | goto end; | |
2296 | } | |
8070f5c0 MD |
2297 | |
2298 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2299 | " fields := struct {\n" |
2300 | ); | |
2301 | if (ret) | |
2302 | goto end; | |
2303 | ||
a90917c3 | 2304 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2305 | if (ret) |
2306 | goto end; | |
2307 | ||
2308 | /* | |
2309 | * LTTng space reservation can only reserve multiples of the | |
2310 | * byte size. | |
2311 | */ | |
2312 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2313 | " };\n" |
2314 | "};\n\n"); | |
c099397a MD |
2315 | if (ret) |
2316 | goto end; | |
2317 | ||
c099397a MD |
2318 | event->metadata_dumped = 1; |
2319 | end: | |
2320 | return ret; | |
2321 | ||
2322 | } | |
2323 | ||
d83004aa JD |
2324 | /* |
2325 | * Must be called with sessions_mutex held. | |
2326 | */ | |
c099397a | 2327 | static |
a90917c3 MD |
2328 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2329 | struct lttng_channel *chan) | |
c099397a MD |
2330 | { |
2331 | int ret = 0; | |
2332 | ||
d4fe3450 | 2333 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2334 | return 0; |
d83004aa JD |
2335 | |
2336 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2337 | return 0; |
2338 | ||
2339 | WARN_ON_ONCE(!chan->header_type); | |
2340 | ret = lttng_metadata_printf(session, | |
2341 | "stream {\n" | |
2342 | " id = %u;\n" | |
9115fbdc | 2343 | " event.header := %s;\n" |
b9074a1b | 2344 | " packet.context := struct packet_context;\n", |
c099397a MD |
2345 | chan->id, |
2346 | chan->header_type == 1 ? "struct event_header_compact" : | |
2347 | "struct event_header_large"); | |
2348 | if (ret) | |
2349 | goto end; | |
2350 | ||
b9074a1b MD |
2351 | if (chan->ctx) { |
2352 | ret = lttng_metadata_printf(session, | |
2353 | " event.context := struct {\n"); | |
2354 | if (ret) | |
2355 | goto end; | |
2356 | } | |
a90917c3 | 2357 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2358 | if (ret) |
2359 | goto end; | |
b9074a1b MD |
2360 | if (chan->ctx) { |
2361 | ret = lttng_metadata_printf(session, | |
2362 | " };\n"); | |
2363 | if (ret) | |
2364 | goto end; | |
2365 | } | |
8070f5c0 MD |
2366 | |
2367 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2368 | "};\n\n"); |
8070f5c0 | 2369 | |
c099397a MD |
2370 | chan->metadata_dumped = 1; |
2371 | end: | |
2372 | return ret; | |
2373 | } | |
2374 | ||
d83004aa JD |
2375 | /* |
2376 | * Must be called with sessions_mutex held. | |
2377 | */ | |
9115fbdc | 2378 | static |
a90917c3 | 2379 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2380 | { |
2381 | return lttng_metadata_printf(session, | |
2382 | "struct packet_context {\n" | |
a3ccff4f MD |
2383 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2384 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2385 | " uint64_t content_size;\n" |
2386 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2387 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2388 | " unsigned long events_discarded;\n" |
9115fbdc | 2389 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2390 | "};\n\n" |
9115fbdc MD |
2391 | ); |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * Compact header: | |
2396 | * id: range: 0 - 30. | |
2397 | * id 31 is reserved to indicate an extended header. | |
2398 | * | |
2399 | * Large header: | |
2400 | * id: range: 0 - 65534. | |
2401 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2402 | * |
2403 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2404 | */ |
2405 | static | |
a90917c3 | 2406 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2407 | { |
2408 | return lttng_metadata_printf(session, | |
2409 | "struct event_header_compact {\n" | |
2410 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2411 | " variant <id> {\n" | |
2412 | " struct {\n" | |
a3ccff4f | 2413 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2414 | " } compact;\n" |
2415 | " struct {\n" | |
2416 | " uint32_t id;\n" | |
a3ccff4f | 2417 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2418 | " } extended;\n" |
2419 | " } v;\n" | |
2420 | "} align(%u);\n" | |
2421 | "\n" | |
2422 | "struct event_header_large {\n" | |
2423 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2424 | " variant <id> {\n" | |
2425 | " struct {\n" | |
a3ccff4f | 2426 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2427 | " } compact;\n" |
2428 | " struct {\n" | |
2429 | " uint32_t id;\n" | |
a3ccff4f | 2430 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2431 | " } extended;\n" |
2432 | " } v;\n" | |
2433 | "} align(%u);\n\n", | |
a90917c3 MD |
2434 | lttng_alignof(uint32_t) * CHAR_BIT, |
2435 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2436 | ); |
2437 | } | |
2438 | ||
a3ccff4f MD |
2439 | /* |
2440 | * Approximation of NTP time of day to clock monotonic correlation, | |
2441 | * taken at start of trace. | |
2442 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2443 | * in future versions. | |
5283350b MD |
2444 | * This function may return a negative offset. It may happen if the |
2445 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2446 | */ |
2447 | static | |
8967b2a3 | 2448 | int64_t measure_clock_offset(void) |
a3ccff4f | 2449 | { |
dcb93448 | 2450 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2451 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2452 | int64_t offset; |
a3ccff4f MD |
2453 | struct timespec rts = { 0, 0 }; |
2454 | unsigned long flags; | |
2455 | ||
2456 | /* Disable interrupts to increase correlation precision. */ | |
2457 | local_irq_save(flags); | |
2458 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2459 | getnstimeofday(&rts); |
a3ccff4f MD |
2460 | monotonic[1] = trace_clock_read64(); |
2461 | local_irq_restore(flags); | |
2462 | ||
dcb93448 | 2463 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2464 | realtime = (uint64_t) rts.tv_sec * tcf; |
2465 | if (tcf == NSEC_PER_SEC) { | |
2466 | realtime += rts.tv_nsec; | |
2467 | } else { | |
2468 | uint64_t n = rts.tv_nsec * tcf; | |
2469 | ||
2470 | do_div(n, NSEC_PER_SEC); | |
2471 | realtime += n; | |
2472 | } | |
dcb93448 | 2473 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2474 | return offset; |
2475 | } | |
2476 | ||
c099397a MD |
2477 | /* |
2478 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2479 | * Must be called with sessions_mutex held. |
c099397a MD |
2480 | */ |
2481 | static | |
a90917c3 | 2482 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2483 | { |
30bdb6e4 | 2484 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2485 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2486 | struct lttng_channel *chan; |
2487 | struct lttng_event *event; | |
c099397a MD |
2488 | int ret = 0; |
2489 | ||
d4fe3450 | 2490 | if (!READ_ONCE(session->active)) |
c099397a MD |
2491 | return 0; |
2492 | if (session->metadata_dumped) | |
2493 | goto skip_session; | |
c099397a | 2494 | |
d793d5e1 | 2495 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2496 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2497 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2498 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2499 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2500 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2501 | |
2502 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2503 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2504 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2505 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2506 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2507 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2508 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2509 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2510 | "\n" |
2511 | "trace {\n" | |
2512 | " major = %u;\n" | |
2513 | " minor = %u;\n" | |
30bdb6e4 | 2514 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2515 | " byte_order = %s;\n" |
2516 | " packet.header := struct {\n" | |
2517 | " uint32_t magic;\n" | |
1ec3f75a | 2518 | " uint8_t uuid[16];\n" |
d793d5e1 | 2519 | " uint32_t stream_id;\n" |
5594698f | 2520 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2521 | " };\n" |
d793d5e1 | 2522 | "};\n\n", |
a90917c3 MD |
2523 | lttng_alignof(uint8_t) * CHAR_BIT, |
2524 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2525 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2526 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2527 | sizeof(unsigned long) * CHAR_BIT, |
2528 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2529 | CTF_SPEC_MAJOR, |
2530 | CTF_SPEC_MINOR, | |
d793d5e1 | 2531 | uuid_s, |
5214fa50 | 2532 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2533 | "be" |
2534 | #else | |
2535 | "le" | |
2536 | #endif | |
2537 | ); | |
2538 | if (ret) | |
2539 | goto end; | |
2540 | ||
99dc9597 MD |
2541 | ret = lttng_metadata_printf(session, |
2542 | "env {\n" | |
a6058143 | 2543 | " hostname = \"%s\";\n" |
c6c9e10f | 2544 | " domain = \"kernel\";\n" |
99dc9597 | 2545 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2546 | " kernel_release = \"%s\";\n" |
2547 | " kernel_version = \"%s\";\n" | |
2548 | " tracer_name = \"lttng-modules\";\n" | |
2549 | " tracer_major = %d;\n" | |
2550 | " tracer_minor = %d;\n" | |
2551 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2552 | "};\n\n", |
3d0d43db | 2553 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2554 | utsname()->sysname, |
2555 | utsname()->release, | |
c6c9e10f MD |
2556 | utsname()->version, |
2557 | LTTNG_MODULES_MAJOR_VERSION, | |
2558 | LTTNG_MODULES_MINOR_VERSION, | |
2559 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2560 | ); |
2561 | if (ret) | |
2562 | goto end; | |
2563 | ||
a3ccff4f MD |
2564 | ret = lttng_metadata_printf(session, |
2565 | "clock {\n" | |
2754583e MD |
2566 | " name = \"%s\";\n", |
2567 | trace_clock_name() | |
a82c63f1 MD |
2568 | ); |
2569 | if (ret) | |
2570 | goto end; | |
2571 | ||
2572 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2573 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2574 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2575 | clock_uuid_s |
2576 | ); | |
2577 | if (ret) | |
2578 | goto end; | |
2579 | } | |
2580 | ||
2581 | ret = lttng_metadata_printf(session, | |
2754583e | 2582 | " description = \"%s\";\n" |
a3ccff4f MD |
2583 | " freq = %llu; /* Frequency, in Hz */\n" |
2584 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2585 | " offset = %lld;\n" |
a3ccff4f | 2586 | "};\n\n", |
2754583e | 2587 | trace_clock_description(), |
a3ccff4f | 2588 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2589 | (long long) measure_clock_offset() |
a3ccff4f MD |
2590 | ); |
2591 | if (ret) | |
2592 | goto end; | |
2593 | ||
2594 | ret = lttng_metadata_printf(session, | |
2595 | "typealias integer {\n" | |
2596 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2597 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2598 | "} := uint27_clock_monotonic_t;\n" |
2599 | "\n" | |
2600 | "typealias integer {\n" | |
2601 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2602 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2603 | "} := uint32_clock_monotonic_t;\n" |
2604 | "\n" | |
2605 | "typealias integer {\n" | |
2606 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2607 | " map = clock.%s.value;\n" |
a3ccff4f | 2608 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2609 | trace_clock_name(), |
a3ccff4f | 2610 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2611 | trace_clock_name(), |
2612 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2613 | trace_clock_name() | |
a3ccff4f MD |
2614 | ); |
2615 | if (ret) | |
2616 | goto end; | |
2617 | ||
a90917c3 | 2618 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2619 | if (ret) |
2620 | goto end; | |
2621 | ||
a90917c3 | 2622 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2623 | if (ret) |
2624 | goto end; | |
2625 | ||
c099397a MD |
2626 | skip_session: |
2627 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2628 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2629 | if (ret) |
2630 | goto end; | |
2631 | } | |
2632 | ||
2633 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2634 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2635 | if (ret) |
2636 | goto end; | |
2637 | } | |
2638 | session->metadata_dumped = 1; | |
2639 | end: | |
2640 | return ret; | |
2641 | } | |
2642 | ||
c0e31d2e | 2643 | /** |
a90917c3 | 2644 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2645 | * @transport: transport structure |
2646 | * | |
2647 | * Registers a transport which can be used as output to extract the data out of | |
2648 | * LTTng. The module calling this registration function must ensure that no | |
2649 | * trap-inducing code will be executed by the transport functions. E.g. | |
2650 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2651 | * is made visible to the transport function. This registration acts as a | |
2652 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2653 | * after its registration must it synchronize the TLBs. | |
2654 | */ | |
a90917c3 | 2655 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2656 | { |
2657 | /* | |
2658 | * Make sure no page fault can be triggered by the module about to be | |
2659 | * registered. We deal with this here so we don't have to call | |
2660 | * vmalloc_sync_all() in each module's init. | |
2661 | */ | |
6d2a620c | 2662 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2663 | |
2664 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2665 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2666 | mutex_unlock(&sessions_mutex); |
2667 | } | |
a90917c3 | 2668 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2669 | |
2670 | /** | |
a90917c3 | 2671 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2672 | * @transport: transport structure |
2673 | */ | |
a90917c3 | 2674 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2675 | { |
2676 | mutex_lock(&sessions_mutex); | |
2677 | list_del(&transport->node); | |
2678 | mutex_unlock(&sessions_mutex); | |
2679 | } | |
a90917c3 | 2680 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2681 | |
ca6fdddb | 2682 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
815aa903 MD |
2683 | |
2684 | enum cpuhp_state lttng_hp_prepare; | |
2685 | enum cpuhp_state lttng_hp_online; | |
2686 | ||
2687 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2688 | { | |
2689 | struct lttng_cpuhp_node *lttng_node; | |
2690 | ||
2691 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2692 | switch (lttng_node->component) { | |
2693 | case LTTNG_RING_BUFFER_FRONTEND: | |
2694 | return 0; | |
2695 | case LTTNG_RING_BUFFER_BACKEND: | |
2696 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2697 | case LTTNG_RING_BUFFER_ITER: | |
2698 | return 0; | |
2699 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2700 | return 0; | |
2701 | default: | |
2702 | return -EINVAL; | |
2703 | } | |
2704 | } | |
2705 | ||
2706 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2707 | { | |
2708 | struct lttng_cpuhp_node *lttng_node; | |
2709 | ||
2710 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2711 | switch (lttng_node->component) { | |
2712 | case LTTNG_RING_BUFFER_FRONTEND: | |
2713 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2714 | case LTTNG_RING_BUFFER_BACKEND: | |
2715 | return 0; | |
2716 | case LTTNG_RING_BUFFER_ITER: | |
2717 | return 0; | |
2718 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2719 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2720 | default: | |
2721 | return -EINVAL; | |
2722 | } | |
2723 | } | |
2724 | ||
2725 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2726 | { | |
2727 | struct lttng_cpuhp_node *lttng_node; | |
2728 | ||
2729 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2730 | switch (lttng_node->component) { | |
2731 | case LTTNG_RING_BUFFER_FRONTEND: | |
2732 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2733 | case LTTNG_RING_BUFFER_BACKEND: | |
2734 | return 0; | |
2735 | case LTTNG_RING_BUFFER_ITER: | |
2736 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2737 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2738 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2739 | default: | |
2740 | return -EINVAL; | |
2741 | } | |
2742 | } | |
2743 | ||
2744 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2745 | { | |
2746 | struct lttng_cpuhp_node *lttng_node; | |
2747 | ||
2748 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2749 | switch (lttng_node->component) { | |
2750 | case LTTNG_RING_BUFFER_FRONTEND: | |
2751 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2752 | case LTTNG_RING_BUFFER_BACKEND: | |
2753 | return 0; | |
2754 | case LTTNG_RING_BUFFER_ITER: | |
2755 | return 0; | |
2756 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2757 | return 0; | |
2758 | default: | |
2759 | return -EINVAL; | |
2760 | } | |
2761 | } | |
2762 | ||
2763 | static int __init lttng_init_cpu_hotplug(void) | |
2764 | { | |
2765 | int ret; | |
2766 | ||
2767 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2768 | lttng_hotplug_prepare, | |
2769 | lttng_hotplug_dead); | |
2770 | if (ret < 0) { | |
2771 | return ret; | |
2772 | } | |
2773 | lttng_hp_prepare = ret; | |
2774 | lttng_rb_set_hp_prepare(ret); | |
2775 | ||
2776 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2777 | lttng_hotplug_online, | |
2778 | lttng_hotplug_offline); | |
2779 | if (ret < 0) { | |
2780 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2781 | lttng_hp_prepare = 0; | |
2782 | return ret; | |
2783 | } | |
2784 | lttng_hp_online = ret; | |
2785 | lttng_rb_set_hp_online(ret); | |
2786 | ||
2787 | return 0; | |
2788 | } | |
2789 | ||
2790 | static void __exit lttng_exit_cpu_hotplug(void) | |
2791 | { | |
2792 | lttng_rb_set_hp_online(0); | |
2793 | cpuhp_remove_multi_state(lttng_hp_online); | |
2794 | lttng_rb_set_hp_prepare(0); | |
2795 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2796 | } | |
2797 | ||
5f26db40 | 2798 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
815aa903 MD |
2799 | static int lttng_init_cpu_hotplug(void) |
2800 | { | |
2801 | return 0; | |
2802 | } | |
2803 | static void lttng_exit_cpu_hotplug(void) | |
2804 | { | |
2805 | } | |
5f26db40 | 2806 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
815aa903 MD |
2807 | |
2808 | ||
a90917c3 | 2809 | static int __init lttng_events_init(void) |
4e3c1b9b | 2810 | { |
1c25284c MD |
2811 | int ret; |
2812 | ||
453b2495 JD |
2813 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2814 | if (ret) | |
2815 | return ret; | |
389d7070 | 2816 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2817 | if (ret) |
2818 | return ret; | |
2819 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2820 | if (ret) |
2821 | return ret; | |
2822 | ret = lttng_probes_init(); | |
389d7070 MD |
2823 | if (ret) |
2824 | return ret; | |
07dfc1d0 | 2825 | ret = lttng_context_init(); |
20591cf7 MD |
2826 | if (ret) |
2827 | return ret; | |
07dfc1d0 MD |
2828 | ret = lttng_tracepoint_init(); |
2829 | if (ret) | |
2830 | goto error_tp; | |
a90917c3 | 2831 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2832 | if (!event_cache) { |
2833 | ret = -ENOMEM; | |
2834 | goto error_kmem; | |
2835 | } | |
80996790 | 2836 | ret = lttng_abi_init(); |
02119ee5 MD |
2837 | if (ret) |
2838 | goto error_abi; | |
0c956676 MD |
2839 | ret = lttng_logger_init(); |
2840 | if (ret) | |
2841 | goto error_logger; | |
815aa903 MD |
2842 | ret = lttng_init_cpu_hotplug(); |
2843 | if (ret) | |
2844 | goto error_hotplug; | |
7f9b8cf7 MJ |
2845 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
2846 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2847 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2848 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2849 | LTTNG_MODULES_EXTRAVERSION, | |
2850 | LTTNG_VERSION_NAME, | |
2851 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2852 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2853 | #else | |
2854 | "", | |
2855 | #endif | |
2856 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2857 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2858 | #else | |
2859 | ""); | |
2860 | #endif | |
4e3c1b9b | 2861 | return 0; |
0c956676 | 2862 | |
815aa903 MD |
2863 | error_hotplug: |
2864 | lttng_logger_exit(); | |
0c956676 MD |
2865 | error_logger: |
2866 | lttng_abi_exit(); | |
02119ee5 | 2867 | error_abi: |
1c25284c | 2868 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2869 | error_kmem: |
2870 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2871 | error_tp: |
2872 | lttng_context_exit(); | |
7f9b8cf7 MJ |
2873 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
2874 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2875 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2876 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2877 | LTTNG_MODULES_EXTRAVERSION, | |
2878 | LTTNG_VERSION_NAME, | |
2879 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2880 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2881 | #else | |
2882 | "", | |
2883 | #endif | |
2884 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2885 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2886 | #else | |
2887 | ""); | |
2888 | #endif | |
1c25284c | 2889 | return ret; |
4e3c1b9b MD |
2890 | } |
2891 | ||
a90917c3 | 2892 | module_init(lttng_events_init); |
11b5a3c2 | 2893 | |
a90917c3 | 2894 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2895 | { |
a90917c3 | 2896 | struct lttng_session *session, *tmpsession; |
92e94819 | 2897 | |
815aa903 | 2898 | lttng_exit_cpu_hotplug(); |
0c956676 | 2899 | lttng_logger_exit(); |
80996790 | 2900 | lttng_abi_exit(); |
92e94819 | 2901 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2902 | lttng_session_destroy(session); |
11b5a3c2 | 2903 | kmem_cache_destroy(event_cache); |
20591cf7 | 2904 | lttng_tracepoint_exit(); |
07dfc1d0 | 2905 | lttng_context_exit(); |
7f9b8cf7 MJ |
2906 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
2907 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2908 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2909 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2910 | LTTNG_MODULES_EXTRAVERSION, | |
2911 | LTTNG_VERSION_NAME, | |
2912 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2913 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2914 | #else | |
2915 | "", | |
2916 | #endif | |
2917 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2918 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2919 | #else | |
2920 | ""); | |
2921 | #endif | |
4e3c1b9b | 2922 | } |
92e94819 | 2923 | |
a90917c3 | 2924 | module_exit(lttng_events_exit); |
11b5a3c2 | 2925 | |
7f9b8cf7 MJ |
2926 | #include "extra_version/patches.i" |
2927 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2928 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2929 | #endif | |
2930 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2931 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2932 | #endif | |
92e94819 MD |
2933 | MODULE_LICENSE("GPL and additional rights"); |
2934 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2935 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2936 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2937 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2938 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2939 | LTTNG_MODULES_EXTRAVERSION); |