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> | |
cbc19040 | 49 | #include <wrapper/types.h> |
241ae9a8 MD |
50 | #include <lttng-kernel-version.h> |
51 | #include <lttng-events.h> | |
52 | #include <lttng-tracer.h> | |
53 | #include <lttng-abi-old.h> | |
5214fa50 | 54 | #include <lttng-endian.h> |
4993071a | 55 | #include <lttng-string-utils.h> |
241ae9a8 | 56 | #include <wrapper/vzalloc.h> |
64af2437 MD |
57 | #include <wrapper/ringbuffer/backend.h> |
58 | #include <wrapper/ringbuffer/frontend.h> | |
0ff00f07 | 59 | #include <wrapper/time.h> |
4e3c1b9b | 60 | |
d83004aa JD |
61 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
62 | ||
4e3c1b9b | 63 | static LIST_HEAD(sessions); |
a90917c3 | 64 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
65 | /* |
66 | * Protect the sessions and metadata caches. | |
67 | */ | |
4e3c1b9b MD |
68 | static DEFINE_MUTEX(sessions_mutex); |
69 | static struct kmem_cache *event_cache; | |
70 | ||
3c997079 MD |
71 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
72 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
73 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
74 | ||
a90917c3 MD |
75 | static void _lttng_event_destroy(struct lttng_event *event); |
76 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
77 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 78 | static |
a90917c3 MD |
79 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
80 | struct lttng_channel *chan, | |
81 | struct lttng_event *event); | |
c099397a | 82 | static |
a90917c3 | 83 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
84 | static |
85 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
86 | static |
87 | int _lttng_field_statedump(struct lttng_session *session, | |
88 | const struct lttng_event_field *field, | |
89 | size_t nesting); | |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
360d3efe | 93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
06980203 MJ |
94 | synchronize_rcu(); |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
06980203 MJ |
97 | #endif |
98 | ||
360d3efe | 99 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
100 | #ifdef CONFIG_PREEMPT_RT_FULL |
101 | synchronize_rcu(); | |
102 | #endif | |
360d3efe | 103 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
360d3efe | 107 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Called with sessions lock held. | |
122 | */ | |
123 | int lttng_session_active(void) | |
124 | { | |
125 | struct lttng_session *iter; | |
126 | ||
127 | list_for_each_entry(iter, &sessions, list) { | |
128 | if (iter->active) | |
129 | return 1; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
a90917c3 | 134 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 135 | { |
a90917c3 | 136 | struct lttng_session *session; |
d83004aa | 137 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 138 | int i; |
4e3c1b9b MD |
139 | |
140 | mutex_lock(&sessions_mutex); | |
fd0cebd8 | 141 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 142 | if (!session) |
d83004aa | 143 | goto err; |
4e3c1b9b | 144 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 145 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 146 | uuid_le_gen(&session->uuid); |
d83004aa JD |
147 | |
148 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
149 | GFP_KERNEL); | |
150 | if (!metadata_cache) | |
151 | goto err_free_session; | |
f6da044f | 152 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
153 | if (!metadata_cache->data) |
154 | goto err_free_cache; | |
155 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
156 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 157 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
158 | session->metadata_cache = metadata_cache; |
159 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
160 | memcpy(&metadata_cache->uuid, &session->uuid, |
161 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
162 | INIT_LIST_HEAD(&session->enablers_head); |
163 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
164 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
165 | list_add(&session->list, &sessions); |
166 | mutex_unlock(&sessions_mutex); | |
167 | return session; | |
d83004aa JD |
168 | |
169 | err_free_cache: | |
170 | kfree(metadata_cache); | |
171 | err_free_session: | |
fd0cebd8 | 172 | lttng_kvfree(session); |
d83004aa JD |
173 | err: |
174 | mutex_unlock(&sessions_mutex); | |
175 | return NULL; | |
176 | } | |
177 | ||
178 | void metadata_cache_destroy(struct kref *kref) | |
179 | { | |
180 | struct lttng_metadata_cache *cache = | |
181 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 182 | vfree(cache->data); |
d83004aa | 183 | kfree(cache); |
4e3c1b9b MD |
184 | } |
185 | ||
a90917c3 | 186 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 187 | { |
a90917c3 MD |
188 | struct lttng_channel *chan, *tmpchan; |
189 | struct lttng_event *event, *tmpevent; | |
d83004aa | 190 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 191 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 192 | int ret; |
4e3c1b9b MD |
193 | |
194 | mutex_lock(&sessions_mutex); | |
acb98454 | 195 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
196 | list_for_each_entry(chan, &session->chan, list) { |
197 | ret = lttng_syscalls_unregister(chan); | |
198 | WARN_ON(ret); | |
199 | } | |
dda6a249 | 200 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 201 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
202 | WARN_ON(ret); |
203 | } | |
abcca994 | 204 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
205 | list_for_each_entry_safe(enabler, tmpenabler, |
206 | &session->enablers_head, node) | |
207 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 208 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 209 | _lttng_event_destroy(event); |
d83004aa JD |
210 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
211 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 212 | _lttng_channel_destroy(chan); |
d83004aa JD |
213 | } |
214 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
215 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
216 | if (session->pid_tracker) |
217 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 218 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
219 | list_del(&session->list); |
220 | mutex_unlock(&sessions_mutex); | |
fd0cebd8 | 221 | lttng_kvfree(session); |
4e3c1b9b MD |
222 | } |
223 | ||
601252cf MD |
224 | int lttng_session_statedump(struct lttng_session *session) |
225 | { | |
226 | int ret; | |
227 | ||
228 | mutex_lock(&sessions_mutex); | |
229 | ret = lttng_statedump_start(session); | |
230 | mutex_unlock(&sessions_mutex); | |
231 | return ret; | |
232 | } | |
233 | ||
a90917c3 | 234 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
235 | { |
236 | int ret = 0; | |
a90917c3 | 237 | struct lttng_channel *chan; |
c0e31d2e MD |
238 | |
239 | mutex_lock(&sessions_mutex); | |
240 | if (session->active) { | |
241 | ret = -EBUSY; | |
242 | goto end; | |
243 | } | |
c099397a | 244 | |
3c997079 MD |
245 | /* Set transient enabler state to "enabled" */ |
246 | session->tstate = 1; | |
247 | ||
c099397a MD |
248 | /* |
249 | * Snapshot the number of events per channel to know the type of header | |
250 | * we need to use. | |
251 | */ | |
252 | list_for_each_entry(chan, &session->chan, list) { | |
253 | if (chan->header_type) | |
254 | continue; /* don't change it if session stop/restart */ | |
255 | if (chan->free_event_id < 31) | |
256 | chan->header_type = 1; /* compact */ | |
257 | else | |
258 | chan->header_type = 2; /* large */ | |
259 | } | |
260 | ||
3c997079 MD |
261 | /* We need to sync enablers with session before activation. */ |
262 | lttng_session_sync_enablers(session); | |
263 | ||
64af2437 | 264 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
265 | list_for_each_entry(chan, &session->chan, list) { |
266 | if (chan->channel_type != METADATA_CHANNEL) | |
267 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
268 | } | |
64af2437 | 269 | |
acb98454 MJ |
270 | WRITE_ONCE(session->active, 1); |
271 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 272 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 273 | if (ret) { |
acb98454 | 274 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
275 | goto end; |
276 | } | |
277 | ret = lttng_statedump_start(session); | |
360f38ea | 278 | if (ret) |
acb98454 | 279 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
280 | end: |
281 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 282 | return ret; |
c0e31d2e MD |
283 | } |
284 | ||
a90917c3 | 285 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
286 | { |
287 | int ret = 0; | |
64af2437 | 288 | struct lttng_channel *chan; |
c0e31d2e MD |
289 | |
290 | mutex_lock(&sessions_mutex); | |
291 | if (!session->active) { | |
292 | ret = -EBUSY; | |
293 | goto end; | |
294 | } | |
acb98454 | 295 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
296 | |
297 | /* Set transient enabler state to "disabled" */ | |
298 | session->tstate = 0; | |
299 | lttng_session_sync_enablers(session); | |
64af2437 MD |
300 | |
301 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
302 | list_for_each_entry(chan, &session->chan, list) { |
303 | if (chan->channel_type != METADATA_CHANNEL) | |
304 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
305 | } | |
c0e31d2e MD |
306 | end: |
307 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 308 | return ret; |
c0e31d2e MD |
309 | } |
310 | ||
9616f0bf JD |
311 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
312 | { | |
313 | int ret = 0; | |
314 | struct lttng_channel *chan; | |
315 | struct lttng_event *event; | |
316 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
317 | struct lttng_metadata_stream *stream; | |
318 | ||
319 | mutex_lock(&sessions_mutex); | |
320 | if (!session->active) { | |
321 | ret = -EBUSY; | |
322 | goto end; | |
323 | } | |
324 | ||
325 | mutex_lock(&cache->lock); | |
326 | memset(cache->data, 0, cache->cache_alloc); | |
327 | cache->metadata_written = 0; | |
328 | cache->version++; | |
329 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
330 | stream->metadata_out = 0; | |
331 | stream->metadata_in = 0; | |
332 | } | |
333 | mutex_unlock(&cache->lock); | |
334 | ||
335 | session->metadata_dumped = 0; | |
336 | list_for_each_entry(chan, &session->chan, list) { | |
337 | chan->metadata_dumped = 0; | |
338 | } | |
339 | ||
340 | list_for_each_entry(event, &session->events, list) { | |
341 | event->metadata_dumped = 0; | |
342 | } | |
343 | ||
344 | ret = _lttng_session_metadata_statedump(session); | |
345 | ||
346 | end: | |
347 | mutex_unlock(&sessions_mutex); | |
348 | return ret; | |
349 | } | |
350 | ||
351 | ||
352 | ||
a90917c3 | 353 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 354 | { |
3c997079 | 355 | int ret = 0; |
e64957da | 356 | |
3c997079 MD |
357 | mutex_lock(&sessions_mutex); |
358 | if (channel->channel_type == METADATA_CHANNEL) { | |
359 | ret = -EPERM; | |
360 | goto end; | |
361 | } | |
362 | if (channel->enabled) { | |
363 | ret = -EEXIST; | |
364 | goto end; | |
365 | } | |
366 | /* Set transient enabler state to "enabled" */ | |
367 | channel->tstate = 1; | |
368 | lttng_session_sync_enablers(channel->session); | |
369 | /* Set atomically the state to "enabled" */ | |
acb98454 | 370 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
371 | end: |
372 | mutex_unlock(&sessions_mutex); | |
373 | return ret; | |
e64957da MD |
374 | } |
375 | ||
a90917c3 | 376 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 377 | { |
3c997079 | 378 | int ret = 0; |
e64957da | 379 | |
3c997079 MD |
380 | mutex_lock(&sessions_mutex); |
381 | if (channel->channel_type == METADATA_CHANNEL) { | |
382 | ret = -EPERM; | |
383 | goto end; | |
384 | } | |
385 | if (!channel->enabled) { | |
386 | ret = -EEXIST; | |
387 | goto end; | |
388 | } | |
389 | /* Set atomically the state to "disabled" */ | |
acb98454 | 390 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
391 | /* Set transient enabler state to "enabled" */ |
392 | channel->tstate = 0; | |
393 | lttng_session_sync_enablers(channel->session); | |
394 | end: | |
395 | mutex_unlock(&sessions_mutex); | |
396 | return ret; | |
e64957da MD |
397 | } |
398 | ||
a90917c3 | 399 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 400 | { |
3c997079 | 401 | int ret = 0; |
e64957da | 402 | |
3c997079 MD |
403 | mutex_lock(&sessions_mutex); |
404 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
405 | ret = -EPERM; | |
406 | goto end; | |
407 | } | |
408 | if (event->enabled) { | |
409 | ret = -EEXIST; | |
410 | goto end; | |
411 | } | |
a0493bef MD |
412 | switch (event->instrumentation) { |
413 | case LTTNG_KERNEL_TRACEPOINT: | |
414 | case LTTNG_KERNEL_SYSCALL: | |
415 | ret = -EINVAL; | |
416 | break; | |
417 | case LTTNG_KERNEL_KPROBE: | |
a0493bef | 418 | case LTTNG_KERNEL_NOOP: |
acb98454 | 419 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
420 | break; |
421 | case LTTNG_KERNEL_KRETPROBE: | |
422 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
423 | break; | |
a7cedfa3 | 424 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
425 | default: |
426 | WARN_ON_ONCE(1); | |
427 | ret = -EINVAL; | |
428 | } | |
3c997079 MD |
429 | end: |
430 | mutex_unlock(&sessions_mutex); | |
431 | return ret; | |
e64957da MD |
432 | } |
433 | ||
a90917c3 | 434 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 435 | { |
3c997079 | 436 | int ret = 0; |
e64957da | 437 | |
3c997079 MD |
438 | mutex_lock(&sessions_mutex); |
439 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
440 | ret = -EPERM; | |
441 | goto end; | |
442 | } | |
443 | if (!event->enabled) { | |
444 | ret = -EEXIST; | |
445 | goto end; | |
446 | } | |
a0493bef MD |
447 | switch (event->instrumentation) { |
448 | case LTTNG_KERNEL_TRACEPOINT: | |
449 | case LTTNG_KERNEL_SYSCALL: | |
450 | ret = -EINVAL; | |
451 | break; | |
452 | case LTTNG_KERNEL_KPROBE: | |
a0493bef | 453 | case LTTNG_KERNEL_NOOP: |
acb98454 | 454 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
455 | break; |
456 | case LTTNG_KERNEL_KRETPROBE: | |
457 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
458 | break; | |
a7cedfa3 | 459 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
460 | default: |
461 | WARN_ON_ONCE(1); | |
462 | ret = -EINVAL; | |
463 | } | |
3c997079 MD |
464 | end: |
465 | mutex_unlock(&sessions_mutex); | |
466 | return ret; | |
e64957da MD |
467 | } |
468 | ||
a90917c3 | 469 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 470 | { |
a90917c3 | 471 | struct lttng_transport *transport; |
f3d01b96 | 472 | |
a90917c3 | 473 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
474 | if (!strcmp(transport->name, name)) |
475 | return transport; | |
476 | } | |
477 | return NULL; | |
478 | } | |
479 | ||
a90917c3 | 480 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
481 | const char *transport_name, |
482 | void *buf_addr, | |
4e3c1b9b MD |
483 | size_t subbuf_size, size_t num_subbuf, |
484 | unsigned int switch_timer_interval, | |
d83004aa JD |
485 | unsigned int read_timer_interval, |
486 | enum channel_type channel_type) | |
4e3c1b9b | 487 | { |
a90917c3 MD |
488 | struct lttng_channel *chan; |
489 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
490 | |
491 | mutex_lock(&sessions_mutex); | |
d83004aa | 492 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 493 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 494 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
495 | if (!transport) { |
496 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
497 | transport_name); | |
c0e31d2e | 498 | goto notransport; |
f3d01b96 | 499 | } |
a33c9927 MD |
500 | if (!try_module_get(transport->owner)) { |
501 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
502 | goto notransport; | |
503 | } | |
a90917c3 | 504 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 505 | if (!chan) |
c0e31d2e | 506 | goto nomem; |
4e3c1b9b | 507 | chan->session = session; |
05d32c64 | 508 | chan->id = session->free_chan_id++; |
3b731ab1 | 509 | chan->ops = &transport->ops; |
125b4df4 MD |
510 | /* |
511 | * Note: the channel creation op already writes into the packet | |
512 | * headers. Therefore the "chan" information used as input | |
513 | * should be already accessible. | |
514 | */ | |
5f5ddf01 MD |
515 | chan->chan = transport->ops.channel_create(transport_name, |
516 | chan, buf_addr, subbuf_size, num_subbuf, | |
517 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
518 | if (!chan->chan) |
519 | goto create_error; | |
3c997079 | 520 | chan->tstate = 1; |
e64957da | 521 | chan->enabled = 1; |
a33c9927 | 522 | chan->transport = transport; |
d83004aa | 523 | chan->channel_type = channel_type; |
4e3c1b9b MD |
524 | list_add(&chan->list, &session->chan); |
525 | mutex_unlock(&sessions_mutex); | |
526 | return chan; | |
527 | ||
f3d01b96 MD |
528 | create_error: |
529 | kfree(chan); | |
c0e31d2e | 530 | nomem: |
a33c9927 MD |
531 | if (transport) |
532 | module_put(transport->owner); | |
c0e31d2e | 533 | notransport: |
e5382b6d | 534 | active: |
4e3c1b9b MD |
535 | mutex_unlock(&sessions_mutex); |
536 | return NULL; | |
537 | } | |
538 | ||
539 | /* | |
d83004aa JD |
540 | * Only used internally at session destruction for per-cpu channels, and |
541 | * when metadata channel is released. | |
542 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 543 | */ |
aa7c23a9 | 544 | static |
a90917c3 | 545 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 546 | { |
11b5a3c2 | 547 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 548 | module_put(chan->transport->owner); |
4e3c1b9b | 549 | list_del(&chan->list); |
8070f5c0 | 550 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
551 | kfree(chan); |
552 | } | |
553 | ||
d83004aa JD |
554 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
555 | { | |
556 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
557 | ||
558 | /* Protect the metadata cache with the sessions_mutex. */ | |
559 | mutex_lock(&sessions_mutex); | |
560 | _lttng_channel_destroy(chan); | |
561 | mutex_unlock(&sessions_mutex); | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
564 | ||
565 | static | |
566 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
567 | { | |
568 | stream->finalized = 1; | |
569 | wake_up_interruptible(&stream->read_wait); | |
570 | } | |
571 | ||
e5382b6d MD |
572 | /* |
573 | * Supports event creation while tracing session is active. | |
3c997079 | 574 | * Needs to be called with sessions mutex held. |
e5382b6d | 575 | */ |
3c997079 MD |
576 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
577 | struct lttng_kernel_event *event_param, | |
578 | void *filter, | |
579 | const struct lttng_event_desc *event_desc, | |
580 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 581 | { |
3c997079 | 582 | struct lttng_session *session = chan->session; |
a90917c3 | 583 | struct lttng_event *event; |
3c997079 MD |
584 | const char *event_name; |
585 | struct hlist_head *head; | |
586 | size_t name_len; | |
587 | uint32_t hash; | |
3d084699 | 588 | int ret; |
4e3c1b9b | 589 | |
abc0446a | 590 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 591 | ret = -EMFILE; |
e5382b6d | 592 | goto full; |
abc0446a | 593 | } |
3c997079 MD |
594 | |
595 | switch (itype) { | |
596 | case LTTNG_KERNEL_TRACEPOINT: | |
597 | event_name = event_desc->name; | |
598 | break; | |
599 | case LTTNG_KERNEL_KPROBE: | |
600 | case LTTNG_KERNEL_KRETPROBE: | |
3c997079 | 601 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 602 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
603 | event_name = event_param->name; |
604 | break; | |
a7cedfa3 | 605 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
606 | default: |
607 | WARN_ON_ONCE(1); | |
608 | ret = -EINVAL; | |
609 | goto type_error; | |
610 | } | |
611 | name_len = strlen(event_name); | |
612 | hash = jhash(event_name, name_len, 0); | |
613 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 614 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
615 | WARN_ON_ONCE(!event->desc); |
616 | if (!strncmp(event->desc->name, event_name, | |
617 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
618 | && chan == event->chan) { | |
619 | ret = -EEXIST; | |
620 | goto exist; | |
abc0446a MD |
621 | } |
622 | } | |
3c997079 | 623 | |
11b5a3c2 | 624 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 625 | if (!event) { |
4cf0bf51 | 626 | ret = -ENOMEM; |
4e3c1b9b | 627 | goto cache_error; |
abc0446a | 628 | } |
4e3c1b9b MD |
629 | event->chan = chan; |
630 | event->filter = filter; | |
e5382b6d | 631 | event->id = chan->free_event_id++; |
3c997079 MD |
632 | event->instrumentation = itype; |
633 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 634 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
635 | INIT_LIST_HEAD(&event->enablers_ref_head); |
636 | ||
637 | switch (itype) { | |
ab2277d6 | 638 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
639 | /* Event will be enabled by enabler sync. */ |
640 | event->enabled = 0; | |
641 | event->registered = 0; | |
642 | event->desc = lttng_event_get(event_name); | |
abc0446a | 643 | if (!event->desc) { |
4cf0bf51 | 644 | ret = -ENOENT; |
d3dbe23c | 645 | goto register_error; |
abc0446a | 646 | } |
3c997079 MD |
647 | /* Populate lttng_event structure before event registration. */ |
648 | smp_wmb(); | |
baf20995 | 649 | break; |
ab2277d6 | 650 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
651 | /* |
652 | * Needs to be explicitly enabled after creation, since | |
653 | * we may want to apply filters. | |
654 | */ | |
655 | event->enabled = 0; | |
3c997079 MD |
656 | event->registered = 1; |
657 | /* | |
658 | * Populate lttng_event structure before event | |
659 | * registration. | |
660 | */ | |
661 | smp_wmb(); | |
662 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
663 | event_param->u.kprobe.symbol_name, |
664 | event_param->u.kprobe.offset, | |
665 | event_param->u.kprobe.addr, | |
666 | event); | |
abc0446a | 667 | if (ret) { |
4cf0bf51 | 668 | ret = -EINVAL; |
d6d808f3 | 669 | goto register_error; |
abc0446a | 670 | } |
edeb3137 MD |
671 | ret = try_module_get(event->desc->owner); |
672 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 673 | break; |
7371f44c MD |
674 | case LTTNG_KERNEL_KRETPROBE: |
675 | { | |
a90917c3 | 676 | struct lttng_event *event_return; |
7371f44c MD |
677 | |
678 | /* kretprobe defines 2 events */ | |
a0493bef MD |
679 | /* |
680 | * Needs to be explicitly enabled after creation, since | |
681 | * we may want to apply filters. | |
682 | */ | |
683 | event->enabled = 0; | |
3c997079 | 684 | event->registered = 1; |
7371f44c MD |
685 | event_return = |
686 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 687 | if (!event_return) { |
4cf0bf51 | 688 | ret = -ENOMEM; |
7371f44c | 689 | goto register_error; |
abc0446a | 690 | } |
7371f44c MD |
691 | event_return->chan = chan; |
692 | event_return->filter = filter; | |
693 | event_return->id = chan->free_event_id++; | |
a0493bef | 694 | event_return->enabled = 0; |
3c997079 MD |
695 | event_return->registered = 1; |
696 | event_return->instrumentation = itype; | |
7371f44c | 697 | /* |
a90917c3 | 698 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
699 | */ |
700 | smp_wmb(); | |
3c997079 | 701 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
702 | event_param->u.kretprobe.symbol_name, |
703 | event_param->u.kretprobe.offset, | |
704 | event_param->u.kretprobe.addr, | |
705 | event, event_return); | |
706 | if (ret) { | |
707 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 708 | ret = -EINVAL; |
7371f44c MD |
709 | goto register_error; |
710 | } | |
711 | /* Take 2 refs on the module: one per event. */ | |
712 | ret = try_module_get(event->desc->owner); | |
713 | WARN_ON_ONCE(!ret); | |
714 | ret = try_module_get(event->desc->owner); | |
715 | WARN_ON_ONCE(!ret); | |
a90917c3 | 716 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 717 | event_return); |
abc0446a | 718 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
719 | if (ret) { |
720 | kmem_cache_free(event_cache, event_return); | |
721 | module_put(event->desc->owner); | |
722 | module_put(event->desc->owner); | |
723 | goto statedump_error; | |
724 | } | |
725 | list_add(&event_return->list, &chan->session->events); | |
726 | break; | |
727 | } | |
1ec65de1 | 728 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 729 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
730 | /* |
731 | * Needs to be explicitly enabled after creation, since | |
732 | * we may want to apply filters. | |
733 | */ | |
734 | event->enabled = 0; | |
3c997079 MD |
735 | event->registered = 0; |
736 | event->desc = event_desc; | |
abc0446a | 737 | if (!event->desc) { |
4cf0bf51 | 738 | ret = -EINVAL; |
259b6cb3 | 739 | goto register_error; |
abc0446a | 740 | } |
1ec65de1 | 741 | break; |
a7cedfa3 | 742 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
743 | default: |
744 | WARN_ON_ONCE(1); | |
4cf0bf51 | 745 | ret = -EINVAL; |
df07930b | 746 | goto register_error; |
baf20995 | 747 | } |
a90917c3 | 748 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
749 | WARN_ON_ONCE(ret > 0); |
750 | if (ret) { | |
c099397a | 751 | goto statedump_error; |
abc0446a | 752 | } |
3c997079 | 753 | hlist_add_head(&event->hlist, head); |
dda6a249 | 754 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
755 | return event; |
756 | ||
c099397a | 757 | statedump_error: |
259b6cb3 | 758 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 759 | register_error: |
11b5a3c2 | 760 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
761 | cache_error: |
762 | exist: | |
3c997079 | 763 | type_error: |
e5382b6d | 764 | full: |
4cf0bf51 | 765 | return ERR_PTR(ret); |
4e3c1b9b MD |
766 | } |
767 | ||
3c997079 MD |
768 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
769 | struct lttng_kernel_event *event_param, | |
770 | void *filter, | |
771 | const struct lttng_event_desc *event_desc, | |
772 | enum lttng_kernel_instrumentation itype) | |
773 | { | |
774 | struct lttng_event *event; | |
775 | ||
776 | mutex_lock(&sessions_mutex); | |
777 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
778 | itype); | |
779 | mutex_unlock(&sessions_mutex); | |
780 | return event; | |
781 | } | |
782 | ||
783 | /* Only used for tracepoints for now. */ | |
784 | static | |
785 | void register_event(struct lttng_event *event) | |
786 | { | |
787 | const struct lttng_event_desc *desc; | |
f127e61e | 788 | int ret = -EINVAL; |
3c997079 | 789 | |
3c997079 MD |
790 | if (event->registered) |
791 | return; | |
4ecb5ad5 | 792 | |
3c997079 | 793 | desc = event->desc; |
4ecb5ad5 MD |
794 | switch (event->instrumentation) { |
795 | case LTTNG_KERNEL_TRACEPOINT: | |
796 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
797 | desc->probe_callback, | |
798 | event); | |
799 | break; | |
800 | case LTTNG_KERNEL_SYSCALL: | |
801 | ret = lttng_syscall_filter_enable(event->chan, | |
802 | desc->name); | |
803 | break; | |
804 | case LTTNG_KERNEL_KPROBE: | |
805 | case LTTNG_KERNEL_KRETPROBE: | |
4ecb5ad5 MD |
806 | case LTTNG_KERNEL_NOOP: |
807 | ret = 0; | |
808 | break; | |
a7cedfa3 | 809 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
810 | default: |
811 | WARN_ON_ONCE(1); | |
812 | } | |
3c997079 MD |
813 | if (!ret) |
814 | event->registered = 1; | |
815 | } | |
816 | ||
4e3c1b9b MD |
817 | /* |
818 | * Only used internally at session destruction. | |
819 | */ | |
a90917c3 | 820 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 821 | { |
4ecb5ad5 | 822 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
823 | int ret = -EINVAL; |
824 | ||
3c997079 MD |
825 | if (!event->registered) |
826 | return 0; | |
827 | ||
4ecb5ad5 | 828 | desc = event->desc; |
38d024ae | 829 | switch (event->instrumentation) { |
ab2277d6 | 830 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 831 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 832 | event->desc->probe_callback, |
11b5a3c2 | 833 | event); |
baf20995 | 834 | break; |
ab2277d6 | 835 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 836 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
837 | ret = 0; |
838 | break; | |
7371f44c MD |
839 | case LTTNG_KERNEL_KRETPROBE: |
840 | lttng_kretprobes_unregister(event); | |
841 | ret = 0; | |
842 | break; | |
33a39a3c | 843 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
844 | ret = lttng_syscall_filter_disable(event->chan, |
845 | desc->name); | |
846 | break; | |
847 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
848 | ret = 0; |
849 | break; | |
a7cedfa3 | 850 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
851 | default: |
852 | WARN_ON_ONCE(1); | |
853 | } | |
3c997079 MD |
854 | if (!ret) |
855 | event->registered = 0; | |
dda6a249 MD |
856 | return ret; |
857 | } | |
858 | ||
859 | /* | |
860 | * Only used internally at session destruction. | |
861 | */ | |
be066e6c | 862 | static |
a90917c3 | 863 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 864 | { |
edeb3137 MD |
865 | switch (event->instrumentation) { |
866 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 867 | lttng_event_put(event->desc); |
edeb3137 MD |
868 | break; |
869 | case LTTNG_KERNEL_KPROBE: | |
870 | module_put(event->desc->owner); | |
871 | lttng_kprobes_destroy_private(event); | |
872 | break; | |
7371f44c MD |
873 | case LTTNG_KERNEL_KRETPROBE: |
874 | module_put(event->desc->owner); | |
875 | lttng_kretprobes_destroy_private(event); | |
876 | break; | |
259b6cb3 | 877 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 878 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 879 | break; |
a7cedfa3 | 880 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
881 | default: |
882 | WARN_ON_ONCE(1); | |
883 | } | |
dda6a249 | 884 | list_del(&event->list); |
8070f5c0 | 885 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 886 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
887 | } |
888 | ||
e0130fab MD |
889 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
890 | { | |
891 | int ret; | |
892 | ||
893 | if (pid < -1) | |
894 | return -EINVAL; | |
895 | mutex_lock(&sessions_mutex); | |
896 | if (pid == -1) { | |
897 | /* track all pids: destroy tracker. */ | |
898 | if (session->pid_tracker) { | |
899 | struct lttng_pid_tracker *lpf; | |
900 | ||
901 | lpf = session->pid_tracker; | |
902 | rcu_assign_pointer(session->pid_tracker, NULL); | |
903 | synchronize_trace(); | |
904 | lttng_pid_tracker_destroy(lpf); | |
905 | } | |
906 | ret = 0; | |
907 | } else { | |
908 | if (!session->pid_tracker) { | |
909 | struct lttng_pid_tracker *lpf; | |
910 | ||
911 | lpf = lttng_pid_tracker_create(); | |
912 | if (!lpf) { | |
913 | ret = -ENOMEM; | |
914 | goto unlock; | |
915 | } | |
916 | ret = lttng_pid_tracker_add(lpf, pid); | |
917 | rcu_assign_pointer(session->pid_tracker, lpf); | |
918 | } else { | |
919 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
920 | } | |
921 | } | |
922 | unlock: | |
923 | mutex_unlock(&sessions_mutex); | |
924 | return ret; | |
925 | } | |
926 | ||
927 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
928 | { | |
929 | int ret; | |
930 | ||
931 | if (pid < -1) | |
932 | return -EINVAL; | |
933 | mutex_lock(&sessions_mutex); | |
934 | if (pid == -1) { | |
935 | /* untrack all pids: replace by empty tracker. */ | |
936 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
937 | struct lttng_pid_tracker *lpf; | |
938 | ||
939 | lpf = lttng_pid_tracker_create(); | |
940 | if (!lpf) { | |
941 | ret = -ENOMEM; | |
942 | goto unlock; | |
943 | } | |
944 | rcu_assign_pointer(session->pid_tracker, lpf); | |
945 | synchronize_trace(); | |
946 | if (old_lpf) | |
947 | lttng_pid_tracker_destroy(old_lpf); | |
948 | ret = 0; | |
949 | } else { | |
950 | if (!session->pid_tracker) { | |
951 | ret = -ENOENT; | |
952 | goto unlock; | |
953 | } | |
954 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
955 | } | |
956 | unlock: | |
957 | mutex_unlock(&sessions_mutex); | |
958 | return ret; | |
959 | } | |
960 | ||
7e6f9ef6 MD |
961 | static |
962 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
963 | { | |
964 | struct lttng_session *session = m->private; | |
965 | struct lttng_pid_tracker *lpf; | |
966 | struct lttng_pid_hash_node *e; | |
967 | int iter = 0, i; | |
968 | ||
969 | mutex_lock(&sessions_mutex); | |
970 | lpf = session->pid_tracker; | |
971 | if (lpf) { | |
972 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
973 | struct hlist_head *head = &lpf->pid_hash[i]; | |
974 | ||
f934e302 | 975 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
976 | if (iter++ >= *pos) |
977 | return e; | |
978 | } | |
979 | } | |
980 | } else { | |
981 | /* PID tracker disabled. */ | |
982 | if (iter >= *pos && iter == 0) { | |
983 | return session; /* empty tracker */ | |
984 | } | |
985 | iter++; | |
986 | } | |
987 | /* End of list */ | |
988 | return NULL; | |
989 | } | |
990 | ||
991 | /* Called with sessions_mutex held. */ | |
992 | static | |
993 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
994 | { | |
995 | struct lttng_session *session = m->private; | |
996 | struct lttng_pid_tracker *lpf; | |
997 | struct lttng_pid_hash_node *e; | |
998 | int iter = 0, i; | |
999 | ||
1000 | (*ppos)++; | |
1001 | lpf = session->pid_tracker; | |
1002 | if (lpf) { | |
1003 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1004 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1005 | ||
f934e302 | 1006 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1007 | if (iter++ >= *ppos) |
1008 | return e; | |
1009 | } | |
1010 | } | |
1011 | } else { | |
1012 | /* PID tracker disabled. */ | |
1013 | if (iter >= *ppos && iter == 0) | |
1014 | return session; /* empty tracker */ | |
1015 | iter++; | |
1016 | } | |
1017 | ||
1018 | /* End of list */ | |
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | static | |
1023 | void pid_list_stop(struct seq_file *m, void *p) | |
1024 | { | |
1025 | mutex_unlock(&sessions_mutex); | |
1026 | } | |
1027 | ||
1028 | static | |
1029 | int pid_list_show(struct seq_file *m, void *p) | |
1030 | { | |
1031 | int pid; | |
1032 | ||
1033 | if (p == m->private) { | |
1034 | /* Tracker disabled. */ | |
1035 | pid = -1; | |
1036 | } else { | |
1037 | const struct lttng_pid_hash_node *e = p; | |
1038 | ||
1039 | pid = lttng_pid_tracker_get_node_pid(e); | |
1040 | } | |
1041 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | static | |
1046 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1047 | .start = pid_list_start, | |
1048 | .next = pid_list_next, | |
1049 | .stop = pid_list_stop, | |
1050 | .show = pid_list_show, | |
1051 | }; | |
1052 | ||
1053 | static | |
1054 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1055 | { | |
1056 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1057 | } | |
1058 | ||
1059 | static | |
1060 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1061 | { | |
1062 | struct seq_file *m = file->private_data; | |
1063 | struct lttng_session *session = m->private; | |
1064 | int ret; | |
1065 | ||
1066 | WARN_ON_ONCE(!session); | |
1067 | ret = seq_release(inode, file); | |
1068 | if (!ret && session) | |
1069 | fput(session->file); | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1074 | .owner = THIS_MODULE, | |
1075 | .open = lttng_tracker_pids_list_open, | |
1076 | .read = seq_read, | |
1077 | .llseek = seq_lseek, | |
1078 | .release = lttng_tracker_pids_list_release, | |
1079 | }; | |
1080 | ||
1081 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1082 | { | |
1083 | struct file *tracker_pids_list_file; | |
1084 | struct seq_file *m; | |
1085 | int file_fd, ret; | |
1086 | ||
1087 | file_fd = lttng_get_unused_fd(); | |
1088 | if (file_fd < 0) { | |
1089 | ret = file_fd; | |
1090 | goto fd_error; | |
1091 | } | |
1092 | ||
1093 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1094 | <tng_tracker_pids_list_fops, | |
1095 | NULL, O_RDWR); | |
1096 | if (IS_ERR(tracker_pids_list_file)) { | |
1097 | ret = PTR_ERR(tracker_pids_list_file); | |
1098 | goto file_error; | |
1099 | } | |
afbee416 MJ |
1100 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1101 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1102 | goto refcount_error; |
1103 | } | |
7e6f9ef6 MD |
1104 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1105 | if (ret < 0) | |
1106 | goto open_error; | |
1107 | m = tracker_pids_list_file->private_data; | |
1108 | m->private = session; | |
1109 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1110 | |
1111 | return file_fd; | |
1112 | ||
1113 | open_error: | |
9c1f4643 MD |
1114 | atomic_long_dec(&session->file->f_count); |
1115 | refcount_error: | |
7e6f9ef6 MD |
1116 | fput(tracker_pids_list_file); |
1117 | file_error: | |
1118 | put_unused_fd(file_fd); | |
1119 | fd_error: | |
1120 | return ret; | |
1121 | } | |
1122 | ||
3c997079 MD |
1123 | /* |
1124 | * Enabler management. | |
1125 | */ | |
1126 | static | |
4993071a PP |
1127 | int lttng_match_enabler_star_glob(const char *desc_name, |
1128 | const char *pattern) | |
3c997079 | 1129 | { |
cbc19040 MD |
1130 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1131 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1132 | return 0; |
1133 | return 1; | |
1134 | } | |
1135 | ||
1136 | static | |
4ecb5ad5 MD |
1137 | int lttng_match_enabler_name(const char *desc_name, |
1138 | const char *name) | |
3c997079 | 1139 | { |
4ecb5ad5 | 1140 | if (strcmp(desc_name, name)) |
3c997079 MD |
1141 | return 0; |
1142 | return 1; | |
1143 | } | |
1144 | ||
1145 | static | |
1146 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1147 | struct lttng_enabler *enabler) | |
1148 | { | |
4ecb5ad5 MD |
1149 | const char *desc_name, *enabler_name; |
1150 | ||
1151 | enabler_name = enabler->event_param.name; | |
1152 | switch (enabler->event_param.instrumentation) { | |
1153 | case LTTNG_KERNEL_TRACEPOINT: | |
1154 | desc_name = desc->name; | |
1155 | break; | |
1156 | case LTTNG_KERNEL_SYSCALL: | |
1157 | desc_name = desc->name; | |
1158 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1159 | desc_name += strlen("compat_"); | |
1160 | if (!strncmp(desc_name, "syscall_exit_", | |
1161 | strlen("syscall_exit_"))) { | |
1162 | desc_name += strlen("syscall_exit_"); | |
1163 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1164 | strlen("syscall_entry_"))) { | |
1165 | desc_name += strlen("syscall_entry_"); | |
1166 | } else { | |
1167 | WARN_ON_ONCE(1); | |
1168 | return -EINVAL; | |
1169 | } | |
1170 | break; | |
1171 | default: | |
1172 | WARN_ON_ONCE(1); | |
1173 | return -EINVAL; | |
1174 | } | |
3c997079 | 1175 | switch (enabler->type) { |
4993071a PP |
1176 | case LTTNG_ENABLER_STAR_GLOB: |
1177 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1178 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1179 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1180 | default: |
1181 | return -EINVAL; | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static | |
1186 | int lttng_event_match_enabler(struct lttng_event *event, | |
1187 | struct lttng_enabler *enabler) | |
1188 | { | |
33a39a3c MD |
1189 | if (enabler->event_param.instrumentation != event->instrumentation) |
1190 | return 0; | |
3c997079 MD |
1191 | if (lttng_desc_match_enabler(event->desc, enabler) |
1192 | && event->chan == enabler->chan) | |
1193 | return 1; | |
1194 | else | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | static | |
1199 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1200 | struct lttng_enabler *enabler) | |
1201 | { | |
1202 | struct lttng_enabler_ref *enabler_ref; | |
1203 | ||
1204 | list_for_each_entry(enabler_ref, | |
1205 | &event->enablers_ref_head, node) { | |
1206 | if (enabler_ref->ref == enabler) | |
1207 | return enabler_ref; | |
1208 | } | |
1209 | return NULL; | |
1210 | } | |
1211 | ||
3c997079 | 1212 | static |
33a39a3c | 1213 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1214 | { |
1215 | struct lttng_session *session = enabler->chan->session; | |
1216 | struct lttng_probe_desc *probe_desc; | |
1217 | const struct lttng_event_desc *desc; | |
1218 | int i; | |
1219 | struct list_head *probe_list; | |
1220 | ||
1221 | probe_list = lttng_get_probe_list_head(); | |
1222 | /* | |
1223 | * For each probe event, if we find that a probe event matches | |
1224 | * our enabler, create an associated lttng_event if not | |
1225 | * already present. | |
1226 | */ | |
1227 | list_for_each_entry(probe_desc, probe_list, head) { | |
1228 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1229 | int found = 0; | |
1230 | struct hlist_head *head; | |
1231 | const char *event_name; | |
1232 | size_t name_len; | |
1233 | uint32_t hash; | |
1234 | struct lttng_event *event; | |
1235 | ||
1236 | desc = probe_desc->event_desc[i]; | |
1237 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1238 | continue; | |
1239 | event_name = desc->name; | |
1240 | name_len = strlen(event_name); | |
1241 | ||
1242 | /* | |
1243 | * Check if already created. | |
1244 | */ | |
1245 | hash = jhash(event_name, name_len, 0); | |
1246 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1247 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1248 | if (event->desc == desc |
1249 | && event->chan == enabler->chan) | |
1250 | found = 1; | |
1251 | } | |
1252 | if (found) | |
1253 | continue; | |
1254 | ||
1255 | /* | |
1256 | * We need to create an event for this | |
1257 | * event probe. | |
1258 | */ | |
1259 | event = _lttng_event_create(enabler->chan, | |
1260 | NULL, NULL, desc, | |
1261 | LTTNG_KERNEL_TRACEPOINT); | |
1262 | if (!event) { | |
1263 | printk(KERN_INFO "Unable to create event %s\n", | |
1264 | probe_desc->event_desc[i]->name); | |
1265 | } | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | ||
33a39a3c MD |
1270 | static |
1271 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1272 | { | |
1273 | int ret; | |
1274 | ||
1275 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1276 | WARN_ON_ONCE(ret); | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * Create struct lttng_event if it is missing and present in the list of | |
1281 | * tracepoint probes. | |
1282 | * Should be called with sessions mutex held. | |
1283 | */ | |
1284 | static | |
1285 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1286 | { | |
1287 | switch (enabler->event_param.instrumentation) { | |
1288 | case LTTNG_KERNEL_TRACEPOINT: | |
1289 | lttng_create_tracepoint_if_missing(enabler); | |
1290 | break; | |
1291 | case LTTNG_KERNEL_SYSCALL: | |
1292 | lttng_create_syscall_if_missing(enabler); | |
1293 | break; | |
1294 | default: | |
1295 | WARN_ON_ONCE(1); | |
1296 | break; | |
1297 | } | |
1298 | } | |
1299 | ||
3c997079 MD |
1300 | /* |
1301 | * Create events associated with an enabler (if not already present), | |
1302 | * and add backward reference from the event to the enabler. | |
1303 | * Should be called with sessions mutex held. | |
1304 | */ | |
1305 | static | |
1306 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1307 | { | |
1308 | struct lttng_session *session = enabler->chan->session; | |
1309 | struct lttng_event *event; | |
1310 | ||
1311 | /* First ensure that probe events are created for this enabler. */ | |
1312 | lttng_create_event_if_missing(enabler); | |
1313 | ||
1314 | /* For each event matching enabler in session event list. */ | |
1315 | list_for_each_entry(event, &session->events, list) { | |
1316 | struct lttng_enabler_ref *enabler_ref; | |
1317 | ||
1318 | if (!lttng_event_match_enabler(event, enabler)) | |
1319 | continue; | |
1320 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1321 | if (!enabler_ref) { | |
1322 | /* | |
1323 | * If no backward ref, create it. | |
1324 | * Add backward ref from event to enabler. | |
1325 | */ | |
1326 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1327 | if (!enabler_ref) | |
1328 | return -ENOMEM; | |
1329 | enabler_ref->ref = enabler; | |
1330 | list_add(&enabler_ref->node, | |
1331 | &event->enablers_ref_head); | |
1332 | } | |
1333 | ||
f127e61e MD |
1334 | /* |
1335 | * Link filter bytecodes if not linked yet. | |
1336 | */ | |
1337 | lttng_enabler_event_link_bytecode(event, enabler); | |
1338 | ||
3c997079 MD |
1339 | /* TODO: merge event context. */ |
1340 | } | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * Called at module load: connect the probe on all enablers matching | |
1346 | * this event. | |
1347 | * Called with sessions lock held. | |
1348 | */ | |
1349 | int lttng_fix_pending_events(void) | |
1350 | { | |
1351 | struct lttng_session *session; | |
1352 | ||
1353 | list_for_each_entry(session, &sessions, list) | |
1354 | lttng_session_lazy_sync_enablers(session); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1359 | struct lttng_kernel_event *event_param, | |
1360 | struct lttng_channel *chan) | |
1361 | { | |
1362 | struct lttng_enabler *enabler; | |
1363 | ||
1364 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1365 | if (!enabler) | |
1366 | return NULL; | |
1367 | enabler->type = type; | |
07dfc1d0 | 1368 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1369 | memcpy(&enabler->event_param, event_param, |
1370 | sizeof(enabler->event_param)); | |
1371 | enabler->chan = chan; | |
1372 | /* ctx left NULL */ | |
4fd19d8a | 1373 | enabler->enabled = 0; |
3c997079 MD |
1374 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1375 | mutex_lock(&sessions_mutex); | |
1376 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1377 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1378 | mutex_unlock(&sessions_mutex); | |
1379 | return enabler; | |
1380 | } | |
1381 | ||
1382 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1383 | { | |
1384 | mutex_lock(&sessions_mutex); | |
1385 | enabler->enabled = 1; | |
1386 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1387 | mutex_unlock(&sessions_mutex); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1392 | { | |
1393 | mutex_lock(&sessions_mutex); | |
1394 | enabler->enabled = 0; | |
1395 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1396 | mutex_unlock(&sessions_mutex); | |
1397 | return 0; | |
1398 | } | |
1399 | ||
07dfc1d0 MD |
1400 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1401 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1402 | { | |
1403 | struct lttng_filter_bytecode_node *bytecode_node; | |
1404 | uint32_t bytecode_len; | |
1405 | int ret; | |
1406 | ||
1407 | ret = get_user(bytecode_len, &bytecode->len); | |
1408 | if (ret) | |
1409 | return ret; | |
1410 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1411 | GFP_KERNEL); | |
1412 | if (!bytecode_node) | |
1413 | return -ENOMEM; | |
1414 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1415 | sizeof(*bytecode) + bytecode_len); | |
1416 | if (ret) | |
1417 | goto error_free; | |
1418 | bytecode_node->enabler = enabler; | |
1419 | /* Enforce length based on allocated size */ | |
1420 | bytecode_node->bc.len = bytecode_len; | |
1421 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1422 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1423 | return 0; | |
1424 | ||
1425 | error_free: | |
1426 | kfree(bytecode_node); | |
1427 | return ret; | |
1428 | } | |
1429 | ||
3c997079 MD |
1430 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1431 | struct lttng_kernel_context *context_param) | |
1432 | { | |
1433 | return -ENOSYS; | |
1434 | } | |
1435 | ||
1436 | static | |
1437 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1438 | { | |
07dfc1d0 MD |
1439 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1440 | ||
1441 | /* Destroy filter bytecode */ | |
1442 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1443 | &enabler->filter_bytecode_head, node) { | |
1444 | kfree(filter_node); | |
1445 | } | |
1446 | ||
3c997079 MD |
1447 | /* Destroy contexts */ |
1448 | lttng_destroy_context(enabler->ctx); | |
1449 | ||
1450 | list_del(&enabler->node); | |
1451 | kfree(enabler); | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * lttng_session_sync_enablers should be called just before starting a | |
1456 | * session. | |
1457 | * Should be called with sessions mutex held. | |
1458 | */ | |
1459 | static | |
1460 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1461 | { | |
1462 | struct lttng_enabler *enabler; | |
1463 | struct lttng_event *event; | |
1464 | ||
1465 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1466 | lttng_enabler_ref_events(enabler); | |
1467 | /* | |
1468 | * For each event, if at least one of its enablers is enabled, | |
1469 | * and its channel and session transient states are enabled, we | |
1470 | * enable the event, else we disable it. | |
1471 | */ | |
1472 | list_for_each_entry(event, &session->events, list) { | |
1473 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1474 | struct lttng_bytecode_runtime *runtime; |
1475 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1476 | |
4ecb5ad5 MD |
1477 | switch (event->instrumentation) { |
1478 | case LTTNG_KERNEL_TRACEPOINT: | |
1479 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1480 | /* Enable events */ |
1481 | list_for_each_entry(enabler_ref, | |
1482 | &event->enablers_ref_head, node) { | |
1483 | if (enabler_ref->ref->enabled) { | |
1484 | enabled = 1; | |
1485 | break; | |
1486 | } | |
1487 | } | |
4ecb5ad5 MD |
1488 | break; |
1489 | default: | |
3c997079 MD |
1490 | /* Not handled with lazy sync. */ |
1491 | continue; | |
1492 | } | |
1493 | /* | |
1494 | * Enabled state is based on union of enablers, with | |
1495 | * intesection of session and channel transient enable | |
1496 | * states. | |
1497 | */ | |
1498 | enabled = enabled && session->tstate && event->chan->tstate; | |
1499 | ||
acb98454 | 1500 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1501 | /* |
1502 | * Sync tracepoint registration with event enabled | |
1503 | * state. | |
1504 | */ | |
1505 | if (enabled) { | |
1506 | register_event(event); | |
1507 | } else { | |
1508 | _lttng_event_unregister(event); | |
1509 | } | |
07dfc1d0 MD |
1510 | |
1511 | /* Check if has enablers without bytecode enabled */ | |
1512 | list_for_each_entry(enabler_ref, | |
1513 | &event->enablers_ref_head, node) { | |
1514 | if (enabler_ref->ref->enabled | |
1515 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1516 | has_enablers_without_bytecode = 1; | |
1517 | break; | |
1518 | } | |
1519 | } | |
1520 | event->has_enablers_without_bytecode = | |
1521 | has_enablers_without_bytecode; | |
1522 | ||
1523 | /* Enable filters */ | |
1524 | list_for_each_entry(runtime, | |
f127e61e | 1525 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1526 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1527 | } |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Apply enablers to session events, adding events to session if need | |
1532 | * be. It is required after each modification applied to an active | |
1533 | * session, and right before session "start". | |
1534 | * "lazy" sync means we only sync if required. | |
1535 | * Should be called with sessions mutex held. | |
1536 | */ | |
1537 | static | |
1538 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1539 | { | |
1540 | /* We can skip if session is not active */ | |
1541 | if (!session->active) | |
1542 | return; | |
1543 | lttng_session_sync_enablers(session); | |
1544 | } | |
1545 | ||
1ec3f75a | 1546 | /* |
d83004aa JD |
1547 | * Serialize at most one packet worth of metadata into a metadata |
1548 | * channel. | |
92d9f5e6 MD |
1549 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1550 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1551 | * allows us to do racy operations such as looking for remaining space left in | |
1552 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1553 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1554 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1555 | * Returns the number of bytes written in the channel, 0 if no data |
1556 | * was written and a negative value on error. | |
1ec3f75a | 1557 | */ |
b3b8072b MD |
1558 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1559 | struct channel *chan) | |
d83004aa JD |
1560 | { |
1561 | struct lib_ring_buffer_ctx ctx; | |
1562 | int ret = 0; | |
1563 | size_t len, reserve_len; | |
1564 | ||
f613e3e6 | 1565 | /* |
92d9f5e6 MD |
1566 | * Ensure we support mutiple get_next / put sequences followed by |
1567 | * put_next. The metadata cache lock protects reading the metadata | |
1568 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1569 | * "flush" operations on the buffer invoked by different processes. | |
1570 | * Moreover, since the metadata cache memory can be reallocated, we | |
1571 | * need to have exclusive access against updates even though we only | |
1572 | * read it. | |
f613e3e6 | 1573 | */ |
92d9f5e6 | 1574 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1575 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1576 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1577 | goto end; |
f613e3e6 | 1578 | |
9616f0bf JD |
1579 | /* Metadata regenerated, change the version. */ |
1580 | if (stream->metadata_cache->version != stream->version) | |
1581 | stream->version = stream->metadata_cache->version; | |
1582 | ||
d83004aa | 1583 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1584 | stream->metadata_in; |
9de2c215 | 1585 | if (!len) |
de23d59d | 1586 | goto end; |
d83004aa | 1587 | reserve_len = min_t(size_t, |
b3b8072b | 1588 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1589 | len); |
b3b8072b | 1590 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1591 | sizeof(char), -1); |
1592 | /* | |
1593 | * If reservation failed, return an error to the caller. | |
1594 | */ | |
b3b8072b | 1595 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1596 | if (ret != 0) { |
1597 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1598 | goto end; | |
1599 | } | |
b3b8072b | 1600 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1601 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1602 | reserve_len); |
b3b8072b | 1603 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1604 | stream->metadata_in += reserve_len; |
d83004aa JD |
1605 | ret = reserve_len; |
1606 | ||
1607 | end: | |
92d9f5e6 | 1608 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1609 | return ret; |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * Write the metadata to the metadata cache. | |
1614 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1615 | * The metadata cache lock protects us from concurrent read access from |
1616 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1617 | */ |
a90917c3 | 1618 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1619 | const char *fmt, ...) |
1620 | { | |
c099397a | 1621 | char *str; |
d83004aa | 1622 | size_t len; |
c099397a | 1623 | va_list ap; |
d83004aa | 1624 | struct lttng_metadata_stream *stream; |
c099397a | 1625 | |
acb98454 | 1626 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1627 | |
1628 | va_start(ap, fmt); | |
1629 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1630 | va_end(ap); | |
1631 | if (!str) | |
1632 | return -ENOMEM; | |
1633 | ||
1ec3f75a | 1634 | len = strlen(str); |
92d9f5e6 | 1635 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1636 | if (session->metadata_cache->metadata_written + len > |
1637 | session->metadata_cache->cache_alloc) { | |
1638 | char *tmp_cache_realloc; | |
1639 | unsigned int tmp_cache_alloc_size; | |
1640 | ||
1641 | tmp_cache_alloc_size = max_t(unsigned int, | |
1642 | session->metadata_cache->cache_alloc + len, | |
1643 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1644 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1645 | if (!tmp_cache_realloc) |
1646 | goto err; | |
a606b6e8 ML |
1647 | if (session->metadata_cache->data) { |
1648 | memcpy(tmp_cache_realloc, | |
1649 | session->metadata_cache->data, | |
1650 | session->metadata_cache->cache_alloc); | |
1651 | vfree(session->metadata_cache->data); | |
1652 | } | |
1653 | ||
d83004aa JD |
1654 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1655 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1656 | } |
d83004aa JD |
1657 | memcpy(session->metadata_cache->data + |
1658 | session->metadata_cache->metadata_written, | |
1659 | str, len); | |
1660 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1661 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1662 | kfree(str); |
d83004aa JD |
1663 | |
1664 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1665 | wake_up_interruptible(&stream->read_wait); | |
1666 | ||
1667 | return 0; | |
1668 | ||
1669 | err: | |
92d9f5e6 | 1670 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1671 | kfree(str); |
1672 | return -ENOMEM; | |
c099397a MD |
1673 | } |
1674 | ||
f513b2bf MD |
1675 | static |
1676 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1677 | { | |
1678 | size_t i; | |
1679 | ||
1680 | for (i = 0; i < nesting; i++) { | |
1681 | int ret; | |
1682 | ||
1683 | ret = lttng_metadata_printf(session, " "); | |
1684 | if (ret) { | |
1685 | return ret; | |
1686 | } | |
1687 | } | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Must be called with sessions_mutex held. | |
1693 | */ | |
1694 | static | |
1695 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1696 | const struct lttng_type *type, | |
1697 | size_t nesting) | |
1698 | { | |
1699 | int ret; | |
1700 | uint32_t i, nr_fields; | |
1701 | ||
1702 | ret = print_tabs(session, nesting); | |
1703 | if (ret) | |
1704 | return ret; | |
1705 | ret = lttng_metadata_printf(session, | |
1706 | "struct {\n"); | |
1707 | if (ret) | |
1708 | return ret; | |
1709 | nr_fields = type->u._struct.nr_fields; | |
1710 | for (i = 0; i < nr_fields; i++) { | |
1711 | const struct lttng_event_field *iter_field; | |
1712 | ||
1713 | iter_field = &type->u._struct.fields[i]; | |
1714 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1715 | if (ret) | |
1716 | return ret; | |
1717 | } | |
1718 | ret = print_tabs(session, nesting); | |
1719 | if (ret) | |
1720 | return ret; | |
1721 | ret = lttng_metadata_printf(session, | |
1722 | "}"); | |
1723 | return ret; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * Must be called with sessions_mutex held. | |
1728 | */ | |
1729 | static | |
1730 | int _lttng_struct_statedump(struct lttng_session *session, | |
1731 | const struct lttng_event_field *field, | |
1732 | size_t nesting) | |
1733 | { | |
1734 | int ret; | |
1735 | ||
1736 | ret = _lttng_struct_type_statedump(session, | |
1737 | &field->type, nesting); | |
1738 | if (ret) | |
1739 | return ret; | |
1740 | ret = lttng_metadata_printf(session, | |
1741 | "_%s;\n", | |
1742 | field->name); | |
1743 | return ret; | |
1744 | } | |
1745 | ||
65c85aa6 MD |
1746 | /* |
1747 | * Must be called with sessions_mutex held. | |
1748 | */ | |
1749 | static | |
1750 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1751 | const struct lttng_type *type, | |
1752 | size_t nesting) | |
1753 | { | |
1754 | int ret; | |
1755 | uint32_t i, nr_choices; | |
1756 | ||
1757 | ret = print_tabs(session, nesting); | |
1758 | if (ret) | |
1759 | return ret; | |
1760 | ret = lttng_metadata_printf(session, | |
1761 | "variant <_%s> {\n", | |
1762 | type->u.variant.tag_name); | |
1763 | if (ret) | |
1764 | return ret; | |
1765 | nr_choices = type->u.variant.nr_choices; | |
1766 | for (i = 0; i < nr_choices; i++) { | |
1767 | const struct lttng_event_field *iter_field; | |
1768 | ||
1769 | iter_field = &type->u.variant.choices[i]; | |
1770 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1771 | if (ret) | |
1772 | return ret; | |
1773 | } | |
1774 | ret = print_tabs(session, nesting); | |
1775 | if (ret) | |
1776 | return ret; | |
1777 | ret = lttng_metadata_printf(session, | |
1778 | "}"); | |
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Must be called with sessions_mutex held. | |
1784 | */ | |
1785 | static | |
1786 | int _lttng_variant_statedump(struct lttng_session *session, | |
1787 | const struct lttng_event_field *field, | |
1788 | size_t nesting) | |
1789 | { | |
1790 | int ret; | |
1791 | ||
1792 | ret = _lttng_variant_type_statedump(session, | |
1793 | &field->type, nesting); | |
1794 | if (ret) | |
1795 | return ret; | |
1796 | ret = lttng_metadata_printf(session, | |
1797 | "_%s;\n", | |
1798 | field->name); | |
1799 | return ret; | |
1800 | } | |
1801 | ||
f513b2bf MD |
1802 | /* |
1803 | * Must be called with sessions_mutex held. | |
1804 | */ | |
1805 | static | |
1806 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1807 | const struct lttng_event_field *field, | |
1808 | size_t nesting) | |
1809 | { | |
1810 | int ret; | |
1811 | const struct lttng_type *elem_type; | |
1812 | ||
65c85aa6 | 1813 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1814 | elem_type = field->type.u.array_compound.elem_type; |
1815 | switch (elem_type->atype) { | |
1816 | case atype_struct: | |
1817 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1818 | if (ret) | |
1819 | return ret; | |
1820 | break; | |
65c85aa6 MD |
1821 | case atype_variant: |
1822 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1823 | if (ret) | |
1824 | return ret; | |
1825 | break; | |
f513b2bf MD |
1826 | default: |
1827 | return -EINVAL; | |
1828 | } | |
1829 | ret = lttng_metadata_printf(session, | |
1830 | " _%s[%u];\n", | |
1831 | field->name, | |
1832 | field->type.u.array_compound.length); | |
1833 | return ret; | |
1834 | } | |
1835 | ||
1836 | /* | |
1837 | * Must be called with sessions_mutex held. | |
1838 | */ | |
1839 | static | |
1840 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1841 | const struct lttng_event_field *field, | |
1842 | size_t nesting) | |
1843 | { | |
1844 | int ret; | |
1845 | const char *length_name; | |
1846 | const struct lttng_type *elem_type; | |
1847 | ||
1848 | length_name = field->type.u.sequence_compound.length_name; | |
1849 | ||
65c85aa6 | 1850 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1851 | elem_type = field->type.u.sequence_compound.elem_type; |
1852 | switch (elem_type->atype) { | |
1853 | case atype_struct: | |
1854 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1855 | if (ret) | |
1856 | return ret; | |
1857 | break; | |
65c85aa6 MD |
1858 | case atype_variant: |
1859 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1860 | if (ret) | |
1861 | return ret; | |
1862 | break; | |
f513b2bf MD |
1863 | default: |
1864 | return -EINVAL; | |
1865 | } | |
1866 | ret = lttng_metadata_printf(session, | |
1867 | " _%s[ _%s ];\n", | |
1868 | field->name, | |
1869 | length_name); | |
1870 | return ret; | |
1871 | } | |
1872 | ||
141ddf28 MD |
1873 | /* |
1874 | * Must be called with sessions_mutex held. | |
1875 | */ | |
1876 | static | |
1877 | int _lttng_enum_statedump(struct lttng_session *session, | |
1878 | const struct lttng_event_field *field, | |
1879 | size_t nesting) | |
1880 | { | |
1881 | const struct lttng_enum_desc *enum_desc; | |
1882 | const struct lttng_integer_type *container_type; | |
1883 | int ret; | |
1884 | unsigned int i, nr_entries; | |
1885 | ||
1886 | enum_desc = field->type.u.basic.enumeration.desc; | |
1887 | container_type = &field->type.u.basic.enumeration.container_type; | |
1888 | nr_entries = enum_desc->nr_entries; | |
1889 | ||
1890 | ret = print_tabs(session, nesting); | |
1891 | if (ret) | |
1892 | goto end; | |
1893 | ret = lttng_metadata_printf(session, | |
578e68ec | 1894 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1895 | container_type->size, |
1896 | container_type->alignment, | |
1897 | container_type->signedness, | |
1898 | (container_type->encoding == lttng_encode_none) | |
1899 | ? "none" | |
1900 | : (container_type->encoding == lttng_encode_UTF8) | |
1901 | ? "UTF8" | |
1902 | : "ASCII", | |
578e68ec GB |
1903 | container_type->base, |
1904 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1905 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1906 | #else | |
1907 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1908 | #endif | |
1909 | ); | |
141ddf28 MD |
1910 | if (ret) |
1911 | goto end; | |
1912 | /* Dump all entries */ | |
1913 | for (i = 0; i < nr_entries; i++) { | |
1914 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1915 | int j, len; | |
1916 | ||
1917 | ret = print_tabs(session, nesting + 1); | |
1918 | if (ret) | |
1919 | goto end; | |
1920 | ret = lttng_metadata_printf(session, | |
1921 | "\""); | |
1922 | if (ret) | |
1923 | goto end; | |
1924 | len = strlen(entry->string); | |
1925 | /* Escape the character '"' */ | |
1926 | for (j = 0; j < len; j++) { | |
1927 | char c = entry->string[j]; | |
1928 | ||
1929 | switch (c) { | |
1930 | case '"': | |
1931 | ret = lttng_metadata_printf(session, | |
1932 | "\\\""); | |
1933 | break; | |
1934 | case '\\': | |
1935 | ret = lttng_metadata_printf(session, | |
1936 | "\\\\"); | |
1937 | break; | |
1938 | default: | |
1939 | ret = lttng_metadata_printf(session, | |
1940 | "%c", c); | |
1941 | break; | |
1942 | } | |
1943 | if (ret) | |
1944 | goto end; | |
1945 | } | |
08ad1061 PP |
1946 | ret = lttng_metadata_printf(session, "\""); |
1947 | if (ret) | |
1948 | goto end; | |
1949 | ||
1950 | if (entry->options.is_auto) { | |
1951 | ret = lttng_metadata_printf(session, ",\n"); | |
1952 | if (ret) | |
1953 | goto end; | |
141ddf28 | 1954 | } else { |
7c559490 MD |
1955 | ret = lttng_metadata_printf(session, |
1956 | " = "); | |
1957 | if (ret) | |
1958 | goto end; | |
1959 | if (entry->start.signedness) | |
141ddf28 | 1960 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1961 | "%lld", (long long) entry->start.value); |
1962 | else | |
1963 | ret = lttng_metadata_printf(session, | |
1964 | "%llu", entry->start.value); | |
1965 | if (ret) | |
1966 | goto end; | |
1967 | if (entry->start.signedness == entry->end.signedness && | |
1968 | entry->start.value | |
1969 | == entry->end.value) { | |
141ddf28 | 1970 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1971 | ",\n"); |
1972 | } else { | |
1973 | if (entry->end.signedness) { | |
1974 | ret = lttng_metadata_printf(session, | |
1975 | " ... %lld,\n", | |
1976 | (long long) entry->end.value); | |
1977 | } else { | |
1978 | ret = lttng_metadata_printf(session, | |
1979 | " ... %llu,\n", | |
1980 | entry->end.value); | |
1981 | } | |
141ddf28 | 1982 | } |
7c559490 MD |
1983 | if (ret) |
1984 | goto end; | |
141ddf28 | 1985 | } |
141ddf28 MD |
1986 | } |
1987 | ret = print_tabs(session, nesting); | |
1988 | if (ret) | |
1989 | goto end; | |
1990 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
1991 | field->name); | |
1992 | end: | |
1993 | return ret; | |
1994 | } | |
1995 | ||
d83004aa JD |
1996 | /* |
1997 | * Must be called with sessions_mutex held. | |
1998 | */ | |
c099397a | 1999 | static |
a90917c3 | 2000 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2001 | const struct lttng_event_field *field, |
2002 | size_t nesting) | |
c099397a | 2003 | { |
c099397a | 2004 | int ret = 0; |
c099397a | 2005 | |
8070f5c0 MD |
2006 | switch (field->type.atype) { |
2007 | case atype_integer: | |
f513b2bf MD |
2008 | ret = print_tabs(session, nesting); |
2009 | if (ret) | |
2010 | return ret; | |
8070f5c0 | 2011 | ret = lttng_metadata_printf(session, |
f513b2bf | 2012 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2013 | field->type.u.basic.integer.size, |
2014 | field->type.u.basic.integer.alignment, | |
2015 | field->type.u.basic.integer.signedness, | |
2016 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2017 | ? "none" | |
2018 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2019 | ? "UTF8" | |
2020 | : "ASCII", | |
2021 | field->type.u.basic.integer.base, | |
5214fa50 | 2022 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2023 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2024 | #else |
8070f5c0 | 2025 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2026 | #endif |
8070f5c0 MD |
2027 | field->name); |
2028 | break; | |
2029 | case atype_enum: | |
141ddf28 | 2030 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2031 | break; |
2032 | case atype_array: | |
2033 | { | |
2034 | const struct lttng_basic_type *elem_type; | |
2035 | ||
2036 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2037 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2038 | ret = print_tabs(session, nesting); |
2039 | if (ret) | |
2040 | return ret; | |
43803cf2 | 2041 | ret = lttng_metadata_printf(session, |
f513b2bf | 2042 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2043 | field->type.u.array.elem_alignment * CHAR_BIT, |
2044 | field->name); | |
2045 | if (ret) | |
2046 | return ret; | |
2047 | } | |
f513b2bf MD |
2048 | ret = print_tabs(session, nesting); |
2049 | if (ret) | |
2050 | return ret; | |
8070f5c0 | 2051 | ret = lttng_metadata_printf(session, |
f513b2bf | 2052 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2053 | elem_type->u.basic.integer.size, |
2054 | elem_type->u.basic.integer.alignment, | |
2055 | elem_type->u.basic.integer.signedness, | |
2056 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2057 | ? "none" | |
2058 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2059 | ? "UTF8" | |
2060 | : "ASCII", | |
2061 | elem_type->u.basic.integer.base, | |
5214fa50 | 2062 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2063 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2064 | #else |
8070f5c0 | 2065 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2066 | #endif |
8070f5c0 MD |
2067 | field->name, field->type.u.array.length); |
2068 | break; | |
2069 | } | |
2070 | case atype_sequence: | |
2071 | { | |
2072 | const struct lttng_basic_type *elem_type; | |
2073 | const struct lttng_basic_type *length_type; | |
2074 | ||
2075 | elem_type = &field->type.u.sequence.elem_type; | |
2076 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2077 | ret = print_tabs(session, nesting); |
2078 | if (ret) | |
2079 | return ret; | |
8070f5c0 | 2080 | ret = lttng_metadata_printf(session, |
f513b2bf | 2081 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2082 | length_type->u.basic.integer.size, |
32257272 | 2083 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2084 | length_type->u.basic.integer.signedness, |
2085 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2086 | ? "none" | |
0635cdd4 | 2087 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2088 | ? "UTF8" |
0635cdd4 | 2089 | : "ASCII"), |
8070f5c0 | 2090 | length_type->u.basic.integer.base, |
5214fa50 | 2091 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2092 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2093 | #else |
0635cdd4 | 2094 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2095 | #endif |
27d2368e MD |
2096 | field->name); |
2097 | if (ret) | |
2098 | return ret; | |
2099 | ||
43803cf2 | 2100 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2101 | ret = print_tabs(session, nesting); |
2102 | if (ret) | |
2103 | return ret; | |
43803cf2 | 2104 | ret = lttng_metadata_printf(session, |
f513b2bf | 2105 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2106 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2107 | field->name); | |
2108 | if (ret) | |
2109 | return ret; | |
2110 | } | |
f513b2bf MD |
2111 | ret = print_tabs(session, nesting); |
2112 | if (ret) | |
2113 | return ret; | |
27d2368e | 2114 | ret = lttng_metadata_printf(session, |
f513b2bf | 2115 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2116 | elem_type->u.basic.integer.size, |
32257272 | 2117 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2118 | elem_type->u.basic.integer.signedness, |
2119 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2120 | ? "none" | |
0635cdd4 | 2121 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2122 | ? "UTF8" |
0635cdd4 | 2123 | : "ASCII"), |
8070f5c0 | 2124 | elem_type->u.basic.integer.base, |
5214fa50 | 2125 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2126 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2127 | #else |
8070f5c0 | 2128 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2129 | #endif |
8070f5c0 | 2130 | field->name, |
27d2368e | 2131 | field->name); |
8070f5c0 MD |
2132 | break; |
2133 | } | |
c099397a | 2134 | |
8070f5c0 MD |
2135 | case atype_string: |
2136 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2137 | ret = print_tabs(session, nesting); |
2138 | if (ret) | |
2139 | return ret; | |
8070f5c0 | 2140 | ret = lttng_metadata_printf(session, |
f513b2bf | 2141 | "string%s _%s;\n", |
8070f5c0 MD |
2142 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2143 | " { encoding = ASCII; }" : "", | |
2144 | field->name); | |
2145 | break; | |
f513b2bf MD |
2146 | case atype_struct: |
2147 | ret = _lttng_struct_statedump(session, field, nesting); | |
2148 | break; | |
2149 | case atype_array_compound: | |
2150 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2151 | break; | |
2152 | case atype_sequence_compound: | |
2153 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2154 | break; | |
65c85aa6 MD |
2155 | case atype_variant: |
2156 | ret = _lttng_variant_statedump(session, field, nesting); | |
2157 | break; | |
f513b2bf | 2158 | |
8070f5c0 MD |
2159 | default: |
2160 | WARN_ON_ONCE(1); | |
2161 | return -EINVAL; | |
2162 | } | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | static | |
a90917c3 | 2167 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2168 | struct lttng_ctx *ctx) |
2169 | { | |
2170 | int ret = 0; | |
2171 | int i; | |
2172 | ||
2173 | if (!ctx) | |
2174 | return 0; | |
2175 | for (i = 0; i < ctx->nr_fields; i++) { | |
2176 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2177 | ||
f513b2bf | 2178 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2179 | if (ret) |
2180 | return ret; | |
2181 | } | |
2182 | return ret; | |
2183 | } | |
2184 | ||
2185 | static | |
a90917c3 MD |
2186 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2187 | struct lttng_event *event) | |
8070f5c0 MD |
2188 | { |
2189 | const struct lttng_event_desc *desc = event->desc; | |
2190 | int ret = 0; | |
2191 | int i; | |
2192 | ||
2193 | for (i = 0; i < desc->nr_fields; i++) { | |
2194 | const struct lttng_event_field *field = &desc->fields[i]; | |
2195 | ||
f513b2bf | 2196 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2197 | if (ret) |
2198 | return ret; | |
c099397a MD |
2199 | } |
2200 | return ret; | |
2201 | } | |
2202 | ||
d83004aa JD |
2203 | /* |
2204 | * Must be called with sessions_mutex held. | |
2205 | */ | |
c099397a | 2206 | static |
a90917c3 MD |
2207 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2208 | struct lttng_channel *chan, | |
2209 | struct lttng_event *event) | |
c099397a MD |
2210 | { |
2211 | int ret = 0; | |
2212 | ||
acb98454 | 2213 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2214 | return 0; |
d83004aa | 2215 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2216 | return 0; |
2217 | ||
2218 | ret = lttng_metadata_printf(session, | |
2219 | "event {\n" | |
ae734547 | 2220 | " name = \"%s\";\n" |
c099397a | 2221 | " id = %u;\n" |
b9074a1b | 2222 | " stream_id = %u;\n", |
c099397a MD |
2223 | event->desc->name, |
2224 | event->id, | |
2225 | event->chan->id); | |
2226 | if (ret) | |
2227 | goto end; | |
2228 | ||
b9074a1b MD |
2229 | if (event->ctx) { |
2230 | ret = lttng_metadata_printf(session, | |
2231 | " context := struct {\n"); | |
2232 | if (ret) | |
2233 | goto end; | |
2234 | } | |
a90917c3 | 2235 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2236 | if (ret) |
2237 | goto end; | |
b9074a1b MD |
2238 | if (event->ctx) { |
2239 | ret = lttng_metadata_printf(session, | |
2240 | " };\n"); | |
2241 | if (ret) | |
2242 | goto end; | |
2243 | } | |
8070f5c0 MD |
2244 | |
2245 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2246 | " fields := struct {\n" |
2247 | ); | |
2248 | if (ret) | |
2249 | goto end; | |
2250 | ||
a90917c3 | 2251 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2252 | if (ret) |
2253 | goto end; | |
2254 | ||
2255 | /* | |
2256 | * LTTng space reservation can only reserve multiples of the | |
2257 | * byte size. | |
2258 | */ | |
2259 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2260 | " };\n" |
2261 | "};\n\n"); | |
c099397a MD |
2262 | if (ret) |
2263 | goto end; | |
2264 | ||
c099397a MD |
2265 | event->metadata_dumped = 1; |
2266 | end: | |
2267 | return ret; | |
2268 | ||
2269 | } | |
2270 | ||
d83004aa JD |
2271 | /* |
2272 | * Must be called with sessions_mutex held. | |
2273 | */ | |
c099397a | 2274 | static |
a90917c3 MD |
2275 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2276 | struct lttng_channel *chan) | |
c099397a MD |
2277 | { |
2278 | int ret = 0; | |
2279 | ||
acb98454 | 2280 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2281 | return 0; |
d83004aa JD |
2282 | |
2283 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2284 | return 0; |
2285 | ||
2286 | WARN_ON_ONCE(!chan->header_type); | |
2287 | ret = lttng_metadata_printf(session, | |
2288 | "stream {\n" | |
2289 | " id = %u;\n" | |
9115fbdc | 2290 | " event.header := %s;\n" |
b9074a1b | 2291 | " packet.context := struct packet_context;\n", |
c099397a MD |
2292 | chan->id, |
2293 | chan->header_type == 1 ? "struct event_header_compact" : | |
2294 | "struct event_header_large"); | |
2295 | if (ret) | |
2296 | goto end; | |
2297 | ||
b9074a1b MD |
2298 | if (chan->ctx) { |
2299 | ret = lttng_metadata_printf(session, | |
2300 | " event.context := struct {\n"); | |
2301 | if (ret) | |
2302 | goto end; | |
2303 | } | |
a90917c3 | 2304 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2305 | if (ret) |
2306 | goto end; | |
b9074a1b MD |
2307 | if (chan->ctx) { |
2308 | ret = lttng_metadata_printf(session, | |
2309 | " };\n"); | |
2310 | if (ret) | |
2311 | goto end; | |
2312 | } | |
8070f5c0 MD |
2313 | |
2314 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2315 | "};\n\n"); |
8070f5c0 | 2316 | |
c099397a MD |
2317 | chan->metadata_dumped = 1; |
2318 | end: | |
2319 | return ret; | |
2320 | } | |
2321 | ||
d83004aa JD |
2322 | /* |
2323 | * Must be called with sessions_mutex held. | |
2324 | */ | |
9115fbdc | 2325 | static |
a90917c3 | 2326 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2327 | { |
2328 | return lttng_metadata_printf(session, | |
2329 | "struct packet_context {\n" | |
a3ccff4f MD |
2330 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2331 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2332 | " uint64_t content_size;\n" |
2333 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2334 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2335 | " unsigned long events_discarded;\n" |
9115fbdc | 2336 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2337 | "};\n\n" |
9115fbdc MD |
2338 | ); |
2339 | } | |
2340 | ||
2341 | /* | |
2342 | * Compact header: | |
2343 | * id: range: 0 - 30. | |
2344 | * id 31 is reserved to indicate an extended header. | |
2345 | * | |
2346 | * Large header: | |
2347 | * id: range: 0 - 65534. | |
2348 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2349 | * |
2350 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2351 | */ |
2352 | static | |
a90917c3 | 2353 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2354 | { |
2355 | return lttng_metadata_printf(session, | |
2356 | "struct event_header_compact {\n" | |
2357 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2358 | " variant <id> {\n" | |
2359 | " struct {\n" | |
a3ccff4f | 2360 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2361 | " } compact;\n" |
2362 | " struct {\n" | |
2363 | " uint32_t id;\n" | |
a3ccff4f | 2364 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2365 | " } extended;\n" |
2366 | " } v;\n" | |
2367 | "} align(%u);\n" | |
2368 | "\n" | |
2369 | "struct event_header_large {\n" | |
2370 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2371 | " variant <id> {\n" | |
2372 | " struct {\n" | |
a3ccff4f | 2373 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2374 | " } compact;\n" |
2375 | " struct {\n" | |
2376 | " uint32_t id;\n" | |
a3ccff4f | 2377 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2378 | " } extended;\n" |
2379 | " } v;\n" | |
2380 | "} align(%u);\n\n", | |
a90917c3 MD |
2381 | lttng_alignof(uint32_t) * CHAR_BIT, |
2382 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2383 | ); |
2384 | } | |
2385 | ||
a3ccff4f MD |
2386 | /* |
2387 | * Approximation of NTP time of day to clock monotonic correlation, | |
2388 | * taken at start of trace. | |
2389 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2390 | * in future versions. | |
5283350b MD |
2391 | * This function may return a negative offset. It may happen if the |
2392 | * system sets the REALTIME clock to 0 after boot. | |
0ff00f07 MJ |
2393 | * |
2394 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2395 | * y2038 compliant. | |
a3ccff4f MD |
2396 | */ |
2397 | static | |
8967b2a3 | 2398 | int64_t measure_clock_offset(void) |
a3ccff4f | 2399 | { |
dcb93448 | 2400 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2401 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2402 | int64_t offset; |
a3ccff4f | 2403 | unsigned long flags; |
0ff00f07 MJ |
2404 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2405 | struct timespec64 rts = { 0, 0 }; | |
2406 | #else | |
2407 | struct timespec rts = { 0, 0 }; | |
2408 | #endif | |
a3ccff4f MD |
2409 | |
2410 | /* Disable interrupts to increase correlation precision. */ | |
2411 | local_irq_save(flags); | |
2412 | monotonic[0] = trace_clock_read64(); | |
0ff00f07 MJ |
2413 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2414 | ktime_get_real_ts64(&rts); | |
2415 | #else | |
216b6baa | 2416 | getnstimeofday(&rts); |
0ff00f07 | 2417 | #endif |
a3ccff4f MD |
2418 | monotonic[1] = trace_clock_read64(); |
2419 | local_irq_restore(flags); | |
2420 | ||
dcb93448 | 2421 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2422 | realtime = (uint64_t) rts.tv_sec * tcf; |
2423 | if (tcf == NSEC_PER_SEC) { | |
2424 | realtime += rts.tv_nsec; | |
2425 | } else { | |
2426 | uint64_t n = rts.tv_nsec * tcf; | |
2427 | ||
2428 | do_div(n, NSEC_PER_SEC); | |
2429 | realtime += n; | |
2430 | } | |
dcb93448 | 2431 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2432 | return offset; |
2433 | } | |
2434 | ||
c099397a MD |
2435 | /* |
2436 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2437 | * Must be called with sessions_mutex held. |
c099397a MD |
2438 | */ |
2439 | static | |
a90917c3 | 2440 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2441 | { |
30bdb6e4 | 2442 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2443 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2444 | struct lttng_channel *chan; |
2445 | struct lttng_event *event; | |
c099397a MD |
2446 | int ret = 0; |
2447 | ||
acb98454 | 2448 | if (!READ_ONCE(session->active)) |
c099397a MD |
2449 | return 0; |
2450 | if (session->metadata_dumped) | |
2451 | goto skip_session; | |
c099397a | 2452 | |
d793d5e1 | 2453 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2454 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2455 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2456 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2457 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2458 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2459 | |
2460 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2461 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2462 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2463 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2464 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2465 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2466 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2467 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2468 | "\n" |
2469 | "trace {\n" | |
2470 | " major = %u;\n" | |
2471 | " minor = %u;\n" | |
30bdb6e4 | 2472 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2473 | " byte_order = %s;\n" |
2474 | " packet.header := struct {\n" | |
2475 | " uint32_t magic;\n" | |
1ec3f75a | 2476 | " uint8_t uuid[16];\n" |
d793d5e1 | 2477 | " uint32_t stream_id;\n" |
5594698f | 2478 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2479 | " };\n" |
d793d5e1 | 2480 | "};\n\n", |
a90917c3 MD |
2481 | lttng_alignof(uint8_t) * CHAR_BIT, |
2482 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2483 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2484 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2485 | sizeof(unsigned long) * CHAR_BIT, |
2486 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2487 | CTF_SPEC_MAJOR, |
2488 | CTF_SPEC_MINOR, | |
d793d5e1 | 2489 | uuid_s, |
5214fa50 | 2490 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2491 | "be" |
2492 | #else | |
2493 | "le" | |
2494 | #endif | |
2495 | ); | |
2496 | if (ret) | |
2497 | goto end; | |
2498 | ||
99dc9597 MD |
2499 | ret = lttng_metadata_printf(session, |
2500 | "env {\n" | |
a6058143 | 2501 | " hostname = \"%s\";\n" |
c6c9e10f | 2502 | " domain = \"kernel\";\n" |
99dc9597 | 2503 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2504 | " kernel_release = \"%s\";\n" |
2505 | " kernel_version = \"%s\";\n" | |
2506 | " tracer_name = \"lttng-modules\";\n" | |
2507 | " tracer_major = %d;\n" | |
2508 | " tracer_minor = %d;\n" | |
2509 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2510 | "};\n\n", |
3d0d43db | 2511 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2512 | utsname()->sysname, |
2513 | utsname()->release, | |
c6c9e10f MD |
2514 | utsname()->version, |
2515 | LTTNG_MODULES_MAJOR_VERSION, | |
2516 | LTTNG_MODULES_MINOR_VERSION, | |
2517 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2518 | ); |
2519 | if (ret) | |
2520 | goto end; | |
2521 | ||
a3ccff4f MD |
2522 | ret = lttng_metadata_printf(session, |
2523 | "clock {\n" | |
2754583e MD |
2524 | " name = \"%s\";\n", |
2525 | trace_clock_name() | |
a82c63f1 MD |
2526 | ); |
2527 | if (ret) | |
2528 | goto end; | |
2529 | ||
2530 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2531 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2532 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2533 | clock_uuid_s |
2534 | ); | |
2535 | if (ret) | |
2536 | goto end; | |
2537 | } | |
2538 | ||
2539 | ret = lttng_metadata_printf(session, | |
2754583e | 2540 | " description = \"%s\";\n" |
a3ccff4f MD |
2541 | " freq = %llu; /* Frequency, in Hz */\n" |
2542 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2543 | " offset = %lld;\n" |
a3ccff4f | 2544 | "};\n\n", |
2754583e | 2545 | trace_clock_description(), |
a3ccff4f | 2546 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2547 | (long long) measure_clock_offset() |
a3ccff4f MD |
2548 | ); |
2549 | if (ret) | |
2550 | goto end; | |
2551 | ||
2552 | ret = lttng_metadata_printf(session, | |
2553 | "typealias integer {\n" | |
2554 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2555 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2556 | "} := uint27_clock_monotonic_t;\n" |
2557 | "\n" | |
2558 | "typealias integer {\n" | |
2559 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2560 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2561 | "} := uint32_clock_monotonic_t;\n" |
2562 | "\n" | |
2563 | "typealias integer {\n" | |
2564 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2565 | " map = clock.%s.value;\n" |
a3ccff4f | 2566 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2567 | trace_clock_name(), |
a3ccff4f | 2568 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2569 | trace_clock_name(), |
2570 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2571 | trace_clock_name() | |
a3ccff4f MD |
2572 | ); |
2573 | if (ret) | |
2574 | goto end; | |
2575 | ||
a90917c3 | 2576 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2577 | if (ret) |
2578 | goto end; | |
2579 | ||
a90917c3 | 2580 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2581 | if (ret) |
2582 | goto end; | |
2583 | ||
c099397a MD |
2584 | skip_session: |
2585 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2586 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2587 | if (ret) |
2588 | goto end; | |
2589 | } | |
2590 | ||
2591 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2592 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2593 | if (ret) |
2594 | goto end; | |
2595 | } | |
2596 | session->metadata_dumped = 1; | |
2597 | end: | |
2598 | return ret; | |
2599 | } | |
2600 | ||
c0e31d2e | 2601 | /** |
a90917c3 | 2602 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2603 | * @transport: transport structure |
2604 | * | |
2605 | * Registers a transport which can be used as output to extract the data out of | |
2606 | * LTTng. The module calling this registration function must ensure that no | |
2607 | * trap-inducing code will be executed by the transport functions. E.g. | |
2608 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2609 | * is made visible to the transport function. This registration acts as a | |
2610 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2611 | * after its registration must it synchronize the TLBs. | |
2612 | */ | |
a90917c3 | 2613 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2614 | { |
2615 | /* | |
2616 | * Make sure no page fault can be triggered by the module about to be | |
2617 | * registered. We deal with this here so we don't have to call | |
2618 | * vmalloc_sync_all() in each module's init. | |
2619 | */ | |
6d2a620c | 2620 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2621 | |
2622 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2623 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2624 | mutex_unlock(&sessions_mutex); |
2625 | } | |
a90917c3 | 2626 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2627 | |
2628 | /** | |
a90917c3 | 2629 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2630 | * @transport: transport structure |
2631 | */ | |
a90917c3 | 2632 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2633 | { |
2634 | mutex_lock(&sessions_mutex); | |
2635 | list_del(&transport->node); | |
2636 | mutex_unlock(&sessions_mutex); | |
2637 | } | |
a90917c3 | 2638 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2639 | |
360d3efe | 2640 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2641 | |
2642 | enum cpuhp_state lttng_hp_prepare; | |
2643 | enum cpuhp_state lttng_hp_online; | |
2644 | ||
2645 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2646 | { | |
2647 | struct lttng_cpuhp_node *lttng_node; | |
2648 | ||
2649 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2650 | switch (lttng_node->component) { | |
2651 | case LTTNG_RING_BUFFER_FRONTEND: | |
2652 | return 0; | |
2653 | case LTTNG_RING_BUFFER_BACKEND: | |
2654 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2655 | case LTTNG_RING_BUFFER_ITER: | |
2656 | return 0; | |
2657 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2658 | return 0; | |
2659 | default: | |
2660 | return -EINVAL; | |
2661 | } | |
2662 | } | |
2663 | ||
2664 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2665 | { | |
2666 | struct lttng_cpuhp_node *lttng_node; | |
2667 | ||
2668 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2669 | switch (lttng_node->component) { | |
2670 | case LTTNG_RING_BUFFER_FRONTEND: | |
2671 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2672 | case LTTNG_RING_BUFFER_BACKEND: | |
2673 | return 0; | |
2674 | case LTTNG_RING_BUFFER_ITER: | |
2675 | return 0; | |
2676 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2677 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2678 | default: | |
2679 | return -EINVAL; | |
2680 | } | |
2681 | } | |
2682 | ||
2683 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2684 | { | |
2685 | struct lttng_cpuhp_node *lttng_node; | |
2686 | ||
2687 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2688 | switch (lttng_node->component) { | |
2689 | case LTTNG_RING_BUFFER_FRONTEND: | |
2690 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2691 | case LTTNG_RING_BUFFER_BACKEND: | |
2692 | return 0; | |
2693 | case LTTNG_RING_BUFFER_ITER: | |
2694 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2695 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2696 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2697 | default: | |
2698 | return -EINVAL; | |
2699 | } | |
2700 | } | |
2701 | ||
2702 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2703 | { | |
2704 | struct lttng_cpuhp_node *lttng_node; | |
2705 | ||
2706 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2707 | switch (lttng_node->component) { | |
2708 | case LTTNG_RING_BUFFER_FRONTEND: | |
2709 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2710 | case LTTNG_RING_BUFFER_BACKEND: | |
2711 | return 0; | |
2712 | case LTTNG_RING_BUFFER_ITER: | |
2713 | return 0; | |
2714 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2715 | return 0; | |
2716 | default: | |
2717 | return -EINVAL; | |
2718 | } | |
2719 | } | |
2720 | ||
2721 | static int __init lttng_init_cpu_hotplug(void) | |
2722 | { | |
2723 | int ret; | |
2724 | ||
2725 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2726 | lttng_hotplug_prepare, | |
2727 | lttng_hotplug_dead); | |
2728 | if (ret < 0) { | |
2729 | return ret; | |
2730 | } | |
2731 | lttng_hp_prepare = ret; | |
2732 | lttng_rb_set_hp_prepare(ret); | |
2733 | ||
2734 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2735 | lttng_hotplug_online, | |
2736 | lttng_hotplug_offline); | |
2737 | if (ret < 0) { | |
2738 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2739 | lttng_hp_prepare = 0; | |
2740 | return ret; | |
2741 | } | |
2742 | lttng_hp_online = ret; | |
2743 | lttng_rb_set_hp_online(ret); | |
2744 | ||
2745 | return 0; | |
2746 | } | |
2747 | ||
2748 | static void __exit lttng_exit_cpu_hotplug(void) | |
2749 | { | |
2750 | lttng_rb_set_hp_online(0); | |
2751 | cpuhp_remove_multi_state(lttng_hp_online); | |
2752 | lttng_rb_set_hp_prepare(0); | |
2753 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2754 | } | |
2755 | ||
360d3efe | 2756 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2757 | static int lttng_init_cpu_hotplug(void) |
2758 | { | |
2759 | return 0; | |
2760 | } | |
2761 | static void lttng_exit_cpu_hotplug(void) | |
2762 | { | |
2763 | } | |
360d3efe | 2764 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2765 | |
2766 | ||
a90917c3 | 2767 | static int __init lttng_events_init(void) |
4e3c1b9b | 2768 | { |
1c25284c MD |
2769 | int ret; |
2770 | ||
453b2495 JD |
2771 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2772 | if (ret) | |
2773 | return ret; | |
389d7070 | 2774 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2775 | if (ret) |
2776 | return ret; | |
2777 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2778 | if (ret) |
2779 | return ret; | |
2780 | ret = lttng_probes_init(); | |
389d7070 MD |
2781 | if (ret) |
2782 | return ret; | |
07dfc1d0 | 2783 | ret = lttng_context_init(); |
20591cf7 MD |
2784 | if (ret) |
2785 | return ret; | |
07dfc1d0 MD |
2786 | ret = lttng_tracepoint_init(); |
2787 | if (ret) | |
2788 | goto error_tp; | |
a90917c3 | 2789 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2790 | if (!event_cache) { |
2791 | ret = -ENOMEM; | |
2792 | goto error_kmem; | |
2793 | } | |
80996790 | 2794 | ret = lttng_abi_init(); |
02119ee5 MD |
2795 | if (ret) |
2796 | goto error_abi; | |
0c956676 MD |
2797 | ret = lttng_logger_init(); |
2798 | if (ret) | |
2799 | goto error_logger; | |
1e367326 MD |
2800 | ret = lttng_init_cpu_hotplug(); |
2801 | if (ret) | |
2802 | goto error_hotplug; | |
2df5d4b7 | 2803 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2804 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2805 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2806 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2807 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2808 | LTTNG_VERSION_NAME, |
2809 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2810 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2811 | #else | |
2812 | "", | |
2813 | #endif | |
2814 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2815 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2816 | #else | |
2817 | ""); | |
2818 | #endif | |
4e3c1b9b | 2819 | return 0; |
0c956676 | 2820 | |
1e367326 MD |
2821 | error_hotplug: |
2822 | lttng_logger_exit(); | |
0c956676 MD |
2823 | error_logger: |
2824 | lttng_abi_exit(); | |
02119ee5 | 2825 | error_abi: |
1c25284c | 2826 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2827 | error_kmem: |
2828 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2829 | error_tp: |
2830 | lttng_context_exit(); | |
2df5d4b7 | 2831 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2832 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2833 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2834 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2835 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2836 | LTTNG_VERSION_NAME, |
2837 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2838 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2839 | #else | |
2840 | "", | |
2841 | #endif | |
2842 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2843 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2844 | #else | |
2845 | ""); | |
2846 | #endif | |
1c25284c | 2847 | return ret; |
4e3c1b9b MD |
2848 | } |
2849 | ||
a90917c3 | 2850 | module_init(lttng_events_init); |
11b5a3c2 | 2851 | |
a90917c3 | 2852 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2853 | { |
a90917c3 | 2854 | struct lttng_session *session, *tmpsession; |
92e94819 | 2855 | |
1e367326 | 2856 | lttng_exit_cpu_hotplug(); |
0c956676 | 2857 | lttng_logger_exit(); |
80996790 | 2858 | lttng_abi_exit(); |
92e94819 | 2859 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2860 | lttng_session_destroy(session); |
11b5a3c2 | 2861 | kmem_cache_destroy(event_cache); |
20591cf7 | 2862 | lttng_tracepoint_exit(); |
07dfc1d0 | 2863 | lttng_context_exit(); |
2df5d4b7 | 2864 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2865 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2866 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2867 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2868 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2869 | LTTNG_VERSION_NAME, |
2870 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2871 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2872 | #else | |
2873 | "", | |
2874 | #endif | |
2875 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2876 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2877 | #else | |
2878 | ""); | |
2879 | #endif | |
4e3c1b9b | 2880 | } |
92e94819 | 2881 | |
a90917c3 | 2882 | module_exit(lttng_events_exit); |
11b5a3c2 | 2883 | |
2df5d4b7 MJ |
2884 | #include "extra_version/patches.i" |
2885 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2886 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2887 | #endif | |
2888 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2889 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2890 | #endif | |
92e94819 MD |
2891 | MODULE_LICENSE("GPL and additional rights"); |
2892 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2893 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2894 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2895 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2896 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2897 | LTTNG_MODULES_EXTRAVERSION); |