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 | { |
06980203 MJ |
93 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
94 | synchronize_rcu(); | |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
06980203 MJ |
97 | #endif |
98 | ||
b8590f40 MD |
99 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
100 | #ifdef CONFIG_PREEMPT_RT_FULL | |
101 | synchronize_rcu(); | |
102 | #endif | |
103 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
b8590f40 | 107 | #endif /* (LINUX_VERSION_CODE >= 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: | |
418 | case LTTNG_KERNEL_FUNCTION: | |
419 | case LTTNG_KERNEL_NOOP: | |
acb98454 | 420 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
421 | break; |
422 | case LTTNG_KERNEL_KRETPROBE: | |
423 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
424 | break; | |
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: | |
453 | case LTTNG_KERNEL_FUNCTION: | |
454 | case LTTNG_KERNEL_NOOP: | |
acb98454 | 455 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
456 | break; |
457 | case LTTNG_KERNEL_KRETPROBE: | |
458 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
459 | break; | |
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: | |
601 | case LTTNG_KERNEL_FUNCTION: | |
602 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 603 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
604 | event_name = event_param->name; |
605 | break; | |
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 | } | |
ab2277d6 | 728 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
729 | /* |
730 | * Needs to be explicitly enabled after creation, since | |
731 | * we may want to apply filters. | |
732 | */ | |
733 | event->enabled = 0; | |
3c997079 MD |
734 | event->registered = 1; |
735 | /* | |
736 | * Populate lttng_event structure before event | |
737 | * registration. | |
738 | */ | |
739 | smp_wmb(); | |
740 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
741 | event_param->u.ftrace.symbol_name, |
742 | event); | |
abc0446a | 743 | if (ret) { |
e0a7a7c4 | 744 | goto register_error; |
abc0446a | 745 | } |
edeb3137 MD |
746 | ret = try_module_get(event->desc->owner); |
747 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 748 | break; |
1ec65de1 | 749 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 750 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
751 | /* |
752 | * Needs to be explicitly enabled after creation, since | |
753 | * we may want to apply filters. | |
754 | */ | |
755 | event->enabled = 0; | |
3c997079 MD |
756 | event->registered = 0; |
757 | event->desc = event_desc; | |
abc0446a | 758 | if (!event->desc) { |
4cf0bf51 | 759 | ret = -EINVAL; |
259b6cb3 | 760 | goto register_error; |
abc0446a | 761 | } |
1ec65de1 | 762 | break; |
baf20995 MD |
763 | default: |
764 | WARN_ON_ONCE(1); | |
4cf0bf51 | 765 | ret = -EINVAL; |
df07930b | 766 | goto register_error; |
baf20995 | 767 | } |
a90917c3 | 768 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
769 | WARN_ON_ONCE(ret > 0); |
770 | if (ret) { | |
c099397a | 771 | goto statedump_error; |
abc0446a | 772 | } |
3c997079 | 773 | hlist_add_head(&event->hlist, head); |
dda6a249 | 774 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
775 | return event; |
776 | ||
c099397a | 777 | statedump_error: |
259b6cb3 | 778 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 779 | register_error: |
11b5a3c2 | 780 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
781 | cache_error: |
782 | exist: | |
3c997079 | 783 | type_error: |
e5382b6d | 784 | full: |
4cf0bf51 | 785 | return ERR_PTR(ret); |
4e3c1b9b MD |
786 | } |
787 | ||
3c997079 MD |
788 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
789 | struct lttng_kernel_event *event_param, | |
790 | void *filter, | |
791 | const struct lttng_event_desc *event_desc, | |
792 | enum lttng_kernel_instrumentation itype) | |
793 | { | |
794 | struct lttng_event *event; | |
795 | ||
796 | mutex_lock(&sessions_mutex); | |
797 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
798 | itype); | |
799 | mutex_unlock(&sessions_mutex); | |
800 | return event; | |
801 | } | |
802 | ||
803 | /* Only used for tracepoints for now. */ | |
804 | static | |
805 | void register_event(struct lttng_event *event) | |
806 | { | |
807 | const struct lttng_event_desc *desc; | |
f127e61e | 808 | int ret = -EINVAL; |
3c997079 | 809 | |
3c997079 MD |
810 | if (event->registered) |
811 | return; | |
4ecb5ad5 | 812 | |
3c997079 | 813 | desc = event->desc; |
4ecb5ad5 MD |
814 | switch (event->instrumentation) { |
815 | case LTTNG_KERNEL_TRACEPOINT: | |
816 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
817 | desc->probe_callback, | |
818 | event); | |
819 | break; | |
820 | case LTTNG_KERNEL_SYSCALL: | |
821 | ret = lttng_syscall_filter_enable(event->chan, | |
822 | desc->name); | |
823 | break; | |
824 | case LTTNG_KERNEL_KPROBE: | |
825 | case LTTNG_KERNEL_KRETPROBE: | |
826 | case LTTNG_KERNEL_FUNCTION: | |
827 | case LTTNG_KERNEL_NOOP: | |
828 | ret = 0; | |
829 | break; | |
830 | default: | |
831 | WARN_ON_ONCE(1); | |
832 | } | |
3c997079 MD |
833 | if (!ret) |
834 | event->registered = 1; | |
835 | } | |
836 | ||
4e3c1b9b MD |
837 | /* |
838 | * Only used internally at session destruction. | |
839 | */ | |
a90917c3 | 840 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 841 | { |
4ecb5ad5 | 842 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
843 | int ret = -EINVAL; |
844 | ||
3c997079 MD |
845 | if (!event->registered) |
846 | return 0; | |
847 | ||
4ecb5ad5 | 848 | desc = event->desc; |
38d024ae | 849 | switch (event->instrumentation) { |
ab2277d6 | 850 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 851 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 852 | event->desc->probe_callback, |
11b5a3c2 | 853 | event); |
baf20995 | 854 | break; |
ab2277d6 | 855 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 856 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
857 | ret = 0; |
858 | break; | |
7371f44c MD |
859 | case LTTNG_KERNEL_KRETPROBE: |
860 | lttng_kretprobes_unregister(event); | |
861 | ret = 0; | |
862 | break; | |
ab2277d6 | 863 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
864 | lttng_ftrace_unregister(event); |
865 | ret = 0; | |
866 | break; | |
33a39a3c | 867 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
868 | ret = lttng_syscall_filter_disable(event->chan, |
869 | desc->name); | |
870 | break; | |
871 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
872 | ret = 0; |
873 | break; | |
baf20995 MD |
874 | default: |
875 | WARN_ON_ONCE(1); | |
876 | } | |
3c997079 MD |
877 | if (!ret) |
878 | event->registered = 0; | |
dda6a249 MD |
879 | return ret; |
880 | } | |
881 | ||
882 | /* | |
883 | * Only used internally at session destruction. | |
884 | */ | |
be066e6c | 885 | static |
a90917c3 | 886 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 887 | { |
edeb3137 MD |
888 | switch (event->instrumentation) { |
889 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 890 | lttng_event_put(event->desc); |
edeb3137 MD |
891 | break; |
892 | case LTTNG_KERNEL_KPROBE: | |
893 | module_put(event->desc->owner); | |
894 | lttng_kprobes_destroy_private(event); | |
895 | break; | |
7371f44c MD |
896 | case LTTNG_KERNEL_KRETPROBE: |
897 | module_put(event->desc->owner); | |
898 | lttng_kretprobes_destroy_private(event); | |
899 | break; | |
edeb3137 MD |
900 | case LTTNG_KERNEL_FUNCTION: |
901 | module_put(event->desc->owner); | |
902 | lttng_ftrace_destroy_private(event); | |
903 | break; | |
259b6cb3 | 904 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 905 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 906 | break; |
edeb3137 MD |
907 | default: |
908 | WARN_ON_ONCE(1); | |
909 | } | |
dda6a249 | 910 | list_del(&event->list); |
8070f5c0 | 911 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 912 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
913 | } |
914 | ||
e0130fab MD |
915 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
916 | { | |
917 | int ret; | |
918 | ||
919 | if (pid < -1) | |
920 | return -EINVAL; | |
921 | mutex_lock(&sessions_mutex); | |
922 | if (pid == -1) { | |
923 | /* track all pids: destroy tracker. */ | |
924 | if (session->pid_tracker) { | |
925 | struct lttng_pid_tracker *lpf; | |
926 | ||
927 | lpf = session->pid_tracker; | |
928 | rcu_assign_pointer(session->pid_tracker, NULL); | |
929 | synchronize_trace(); | |
930 | lttng_pid_tracker_destroy(lpf); | |
931 | } | |
932 | ret = 0; | |
933 | } else { | |
934 | if (!session->pid_tracker) { | |
935 | struct lttng_pid_tracker *lpf; | |
936 | ||
937 | lpf = lttng_pid_tracker_create(); | |
938 | if (!lpf) { | |
939 | ret = -ENOMEM; | |
940 | goto unlock; | |
941 | } | |
942 | ret = lttng_pid_tracker_add(lpf, pid); | |
943 | rcu_assign_pointer(session->pid_tracker, lpf); | |
944 | } else { | |
945 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
946 | } | |
947 | } | |
948 | unlock: | |
949 | mutex_unlock(&sessions_mutex); | |
950 | return ret; | |
951 | } | |
952 | ||
953 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
954 | { | |
955 | int ret; | |
956 | ||
957 | if (pid < -1) | |
958 | return -EINVAL; | |
959 | mutex_lock(&sessions_mutex); | |
960 | if (pid == -1) { | |
961 | /* untrack all pids: replace by empty tracker. */ | |
962 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
963 | struct lttng_pid_tracker *lpf; | |
964 | ||
965 | lpf = lttng_pid_tracker_create(); | |
966 | if (!lpf) { | |
967 | ret = -ENOMEM; | |
968 | goto unlock; | |
969 | } | |
970 | rcu_assign_pointer(session->pid_tracker, lpf); | |
971 | synchronize_trace(); | |
972 | if (old_lpf) | |
973 | lttng_pid_tracker_destroy(old_lpf); | |
974 | ret = 0; | |
975 | } else { | |
976 | if (!session->pid_tracker) { | |
977 | ret = -ENOENT; | |
978 | goto unlock; | |
979 | } | |
980 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
981 | } | |
982 | unlock: | |
983 | mutex_unlock(&sessions_mutex); | |
984 | return ret; | |
985 | } | |
986 | ||
7e6f9ef6 MD |
987 | static |
988 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
989 | { | |
990 | struct lttng_session *session = m->private; | |
991 | struct lttng_pid_tracker *lpf; | |
992 | struct lttng_pid_hash_node *e; | |
993 | int iter = 0, i; | |
994 | ||
995 | mutex_lock(&sessions_mutex); | |
996 | lpf = session->pid_tracker; | |
997 | if (lpf) { | |
998 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
999 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1000 | ||
f934e302 | 1001 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1002 | if (iter++ >= *pos) |
1003 | return e; | |
1004 | } | |
1005 | } | |
1006 | } else { | |
1007 | /* PID tracker disabled. */ | |
1008 | if (iter >= *pos && iter == 0) { | |
1009 | return session; /* empty tracker */ | |
1010 | } | |
1011 | iter++; | |
1012 | } | |
1013 | /* End of list */ | |
1014 | return NULL; | |
1015 | } | |
1016 | ||
1017 | /* Called with sessions_mutex held. */ | |
1018 | static | |
1019 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1020 | { | |
1021 | struct lttng_session *session = m->private; | |
1022 | struct lttng_pid_tracker *lpf; | |
1023 | struct lttng_pid_hash_node *e; | |
1024 | int iter = 0, i; | |
1025 | ||
1026 | (*ppos)++; | |
1027 | lpf = session->pid_tracker; | |
1028 | if (lpf) { | |
1029 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1030 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1031 | ||
f934e302 | 1032 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1033 | if (iter++ >= *ppos) |
1034 | return e; | |
1035 | } | |
1036 | } | |
1037 | } else { | |
1038 | /* PID tracker disabled. */ | |
1039 | if (iter >= *ppos && iter == 0) | |
1040 | return session; /* empty tracker */ | |
1041 | iter++; | |
1042 | } | |
1043 | ||
1044 | /* End of list */ | |
1045 | return NULL; | |
1046 | } | |
1047 | ||
1048 | static | |
1049 | void pid_list_stop(struct seq_file *m, void *p) | |
1050 | { | |
1051 | mutex_unlock(&sessions_mutex); | |
1052 | } | |
1053 | ||
1054 | static | |
1055 | int pid_list_show(struct seq_file *m, void *p) | |
1056 | { | |
1057 | int pid; | |
1058 | ||
1059 | if (p == m->private) { | |
1060 | /* Tracker disabled. */ | |
1061 | pid = -1; | |
1062 | } else { | |
1063 | const struct lttng_pid_hash_node *e = p; | |
1064 | ||
1065 | pid = lttng_pid_tracker_get_node_pid(e); | |
1066 | } | |
1067 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static | |
1072 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1073 | .start = pid_list_start, | |
1074 | .next = pid_list_next, | |
1075 | .stop = pid_list_stop, | |
1076 | .show = pid_list_show, | |
1077 | }; | |
1078 | ||
1079 | static | |
1080 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1081 | { | |
1082 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1083 | } | |
1084 | ||
1085 | static | |
1086 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1087 | { | |
1088 | struct seq_file *m = file->private_data; | |
1089 | struct lttng_session *session = m->private; | |
1090 | int ret; | |
1091 | ||
1092 | WARN_ON_ONCE(!session); | |
1093 | ret = seq_release(inode, file); | |
1094 | if (!ret && session) | |
1095 | fput(session->file); | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1100 | .owner = THIS_MODULE, | |
1101 | .open = lttng_tracker_pids_list_open, | |
1102 | .read = seq_read, | |
1103 | .llseek = seq_lseek, | |
1104 | .release = lttng_tracker_pids_list_release, | |
1105 | }; | |
1106 | ||
1107 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1108 | { | |
1109 | struct file *tracker_pids_list_file; | |
1110 | struct seq_file *m; | |
1111 | int file_fd, ret; | |
1112 | ||
1113 | file_fd = lttng_get_unused_fd(); | |
1114 | if (file_fd < 0) { | |
1115 | ret = file_fd; | |
1116 | goto fd_error; | |
1117 | } | |
1118 | ||
1119 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1120 | <tng_tracker_pids_list_fops, | |
1121 | NULL, O_RDWR); | |
1122 | if (IS_ERR(tracker_pids_list_file)) { | |
1123 | ret = PTR_ERR(tracker_pids_list_file); | |
1124 | goto file_error; | |
1125 | } | |
afbee416 MJ |
1126 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1127 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1128 | goto refcount_error; |
1129 | } | |
7e6f9ef6 MD |
1130 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1131 | if (ret < 0) | |
1132 | goto open_error; | |
1133 | m = tracker_pids_list_file->private_data; | |
1134 | m->private = session; | |
1135 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1136 | |
1137 | return file_fd; | |
1138 | ||
1139 | open_error: | |
9c1f4643 MD |
1140 | atomic_long_dec(&session->file->f_count); |
1141 | refcount_error: | |
7e6f9ef6 MD |
1142 | fput(tracker_pids_list_file); |
1143 | file_error: | |
1144 | put_unused_fd(file_fd); | |
1145 | fd_error: | |
1146 | return ret; | |
1147 | } | |
1148 | ||
3c997079 MD |
1149 | /* |
1150 | * Enabler management. | |
1151 | */ | |
1152 | static | |
4993071a PP |
1153 | int lttng_match_enabler_star_glob(const char *desc_name, |
1154 | const char *pattern) | |
3c997079 | 1155 | { |
cbc19040 MD |
1156 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1157 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1158 | return 0; |
1159 | return 1; | |
1160 | } | |
1161 | ||
1162 | static | |
4ecb5ad5 MD |
1163 | int lttng_match_enabler_name(const char *desc_name, |
1164 | const char *name) | |
3c997079 | 1165 | { |
4ecb5ad5 | 1166 | if (strcmp(desc_name, name)) |
3c997079 MD |
1167 | return 0; |
1168 | return 1; | |
1169 | } | |
1170 | ||
1171 | static | |
1172 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1173 | struct lttng_enabler *enabler) | |
1174 | { | |
4ecb5ad5 MD |
1175 | const char *desc_name, *enabler_name; |
1176 | ||
1177 | enabler_name = enabler->event_param.name; | |
1178 | switch (enabler->event_param.instrumentation) { | |
1179 | case LTTNG_KERNEL_TRACEPOINT: | |
1180 | desc_name = desc->name; | |
1181 | break; | |
1182 | case LTTNG_KERNEL_SYSCALL: | |
1183 | desc_name = desc->name; | |
1184 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1185 | desc_name += strlen("compat_"); | |
1186 | if (!strncmp(desc_name, "syscall_exit_", | |
1187 | strlen("syscall_exit_"))) { | |
1188 | desc_name += strlen("syscall_exit_"); | |
1189 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1190 | strlen("syscall_entry_"))) { | |
1191 | desc_name += strlen("syscall_entry_"); | |
1192 | } else { | |
1193 | WARN_ON_ONCE(1); | |
1194 | return -EINVAL; | |
1195 | } | |
1196 | break; | |
1197 | default: | |
1198 | WARN_ON_ONCE(1); | |
1199 | return -EINVAL; | |
1200 | } | |
3c997079 | 1201 | switch (enabler->type) { |
4993071a PP |
1202 | case LTTNG_ENABLER_STAR_GLOB: |
1203 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1204 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1205 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1206 | default: |
1207 | return -EINVAL; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static | |
1212 | int lttng_event_match_enabler(struct lttng_event *event, | |
1213 | struct lttng_enabler *enabler) | |
1214 | { | |
33a39a3c MD |
1215 | if (enabler->event_param.instrumentation != event->instrumentation) |
1216 | return 0; | |
3c997079 MD |
1217 | if (lttng_desc_match_enabler(event->desc, enabler) |
1218 | && event->chan == enabler->chan) | |
1219 | return 1; | |
1220 | else | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static | |
1225 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1226 | struct lttng_enabler *enabler) | |
1227 | { | |
1228 | struct lttng_enabler_ref *enabler_ref; | |
1229 | ||
1230 | list_for_each_entry(enabler_ref, | |
1231 | &event->enablers_ref_head, node) { | |
1232 | if (enabler_ref->ref == enabler) | |
1233 | return enabler_ref; | |
1234 | } | |
1235 | return NULL; | |
1236 | } | |
1237 | ||
3c997079 | 1238 | static |
33a39a3c | 1239 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1240 | { |
1241 | struct lttng_session *session = enabler->chan->session; | |
1242 | struct lttng_probe_desc *probe_desc; | |
1243 | const struct lttng_event_desc *desc; | |
1244 | int i; | |
1245 | struct list_head *probe_list; | |
1246 | ||
1247 | probe_list = lttng_get_probe_list_head(); | |
1248 | /* | |
1249 | * For each probe event, if we find that a probe event matches | |
1250 | * our enabler, create an associated lttng_event if not | |
1251 | * already present. | |
1252 | */ | |
1253 | list_for_each_entry(probe_desc, probe_list, head) { | |
1254 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1255 | int found = 0; | |
1256 | struct hlist_head *head; | |
1257 | const char *event_name; | |
1258 | size_t name_len; | |
1259 | uint32_t hash; | |
1260 | struct lttng_event *event; | |
1261 | ||
1262 | desc = probe_desc->event_desc[i]; | |
1263 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1264 | continue; | |
1265 | event_name = desc->name; | |
1266 | name_len = strlen(event_name); | |
1267 | ||
1268 | /* | |
1269 | * Check if already created. | |
1270 | */ | |
1271 | hash = jhash(event_name, name_len, 0); | |
1272 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1273 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1274 | if (event->desc == desc |
1275 | && event->chan == enabler->chan) | |
1276 | found = 1; | |
1277 | } | |
1278 | if (found) | |
1279 | continue; | |
1280 | ||
1281 | /* | |
1282 | * We need to create an event for this | |
1283 | * event probe. | |
1284 | */ | |
1285 | event = _lttng_event_create(enabler->chan, | |
1286 | NULL, NULL, desc, | |
1287 | LTTNG_KERNEL_TRACEPOINT); | |
1288 | if (!event) { | |
1289 | printk(KERN_INFO "Unable to create event %s\n", | |
1290 | probe_desc->event_desc[i]->name); | |
1291 | } | |
1292 | } | |
1293 | } | |
1294 | } | |
1295 | ||
33a39a3c MD |
1296 | static |
1297 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1298 | { | |
1299 | int ret; | |
1300 | ||
1301 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1302 | WARN_ON_ONCE(ret); | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * Create struct lttng_event if it is missing and present in the list of | |
1307 | * tracepoint probes. | |
1308 | * Should be called with sessions mutex held. | |
1309 | */ | |
1310 | static | |
1311 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1312 | { | |
1313 | switch (enabler->event_param.instrumentation) { | |
1314 | case LTTNG_KERNEL_TRACEPOINT: | |
1315 | lttng_create_tracepoint_if_missing(enabler); | |
1316 | break; | |
1317 | case LTTNG_KERNEL_SYSCALL: | |
1318 | lttng_create_syscall_if_missing(enabler); | |
1319 | break; | |
1320 | default: | |
1321 | WARN_ON_ONCE(1); | |
1322 | break; | |
1323 | } | |
1324 | } | |
1325 | ||
3c997079 MD |
1326 | /* |
1327 | * Create events associated with an enabler (if not already present), | |
1328 | * and add backward reference from the event to the enabler. | |
1329 | * Should be called with sessions mutex held. | |
1330 | */ | |
1331 | static | |
1332 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1333 | { | |
1334 | struct lttng_session *session = enabler->chan->session; | |
1335 | struct lttng_event *event; | |
1336 | ||
1337 | /* First ensure that probe events are created for this enabler. */ | |
1338 | lttng_create_event_if_missing(enabler); | |
1339 | ||
1340 | /* For each event matching enabler in session event list. */ | |
1341 | list_for_each_entry(event, &session->events, list) { | |
1342 | struct lttng_enabler_ref *enabler_ref; | |
1343 | ||
1344 | if (!lttng_event_match_enabler(event, enabler)) | |
1345 | continue; | |
1346 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1347 | if (!enabler_ref) { | |
1348 | /* | |
1349 | * If no backward ref, create it. | |
1350 | * Add backward ref from event to enabler. | |
1351 | */ | |
1352 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1353 | if (!enabler_ref) | |
1354 | return -ENOMEM; | |
1355 | enabler_ref->ref = enabler; | |
1356 | list_add(&enabler_ref->node, | |
1357 | &event->enablers_ref_head); | |
1358 | } | |
1359 | ||
f127e61e MD |
1360 | /* |
1361 | * Link filter bytecodes if not linked yet. | |
1362 | */ | |
1363 | lttng_enabler_event_link_bytecode(event, enabler); | |
1364 | ||
3c997079 MD |
1365 | /* TODO: merge event context. */ |
1366 | } | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Called at module load: connect the probe on all enablers matching | |
1372 | * this event. | |
1373 | * Called with sessions lock held. | |
1374 | */ | |
1375 | int lttng_fix_pending_events(void) | |
1376 | { | |
1377 | struct lttng_session *session; | |
1378 | ||
1379 | list_for_each_entry(session, &sessions, list) | |
1380 | lttng_session_lazy_sync_enablers(session); | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1385 | struct lttng_kernel_event *event_param, | |
1386 | struct lttng_channel *chan) | |
1387 | { | |
1388 | struct lttng_enabler *enabler; | |
1389 | ||
1390 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1391 | if (!enabler) | |
1392 | return NULL; | |
1393 | enabler->type = type; | |
07dfc1d0 | 1394 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1395 | memcpy(&enabler->event_param, event_param, |
1396 | sizeof(enabler->event_param)); | |
1397 | enabler->chan = chan; | |
1398 | /* ctx left NULL */ | |
4fd19d8a | 1399 | enabler->enabled = 0; |
3c997079 MD |
1400 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1401 | mutex_lock(&sessions_mutex); | |
1402 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1403 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1404 | mutex_unlock(&sessions_mutex); | |
1405 | return enabler; | |
1406 | } | |
1407 | ||
1408 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1409 | { | |
1410 | mutex_lock(&sessions_mutex); | |
1411 | enabler->enabled = 1; | |
1412 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1413 | mutex_unlock(&sessions_mutex); | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1418 | { | |
1419 | mutex_lock(&sessions_mutex); | |
1420 | enabler->enabled = 0; | |
1421 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1422 | mutex_unlock(&sessions_mutex); | |
1423 | return 0; | |
1424 | } | |
1425 | ||
07dfc1d0 MD |
1426 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1427 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1428 | { | |
1429 | struct lttng_filter_bytecode_node *bytecode_node; | |
1430 | uint32_t bytecode_len; | |
1431 | int ret; | |
1432 | ||
1433 | ret = get_user(bytecode_len, &bytecode->len); | |
1434 | if (ret) | |
1435 | return ret; | |
1436 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1437 | GFP_KERNEL); | |
1438 | if (!bytecode_node) | |
1439 | return -ENOMEM; | |
1440 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1441 | sizeof(*bytecode) + bytecode_len); | |
1442 | if (ret) | |
1443 | goto error_free; | |
1444 | bytecode_node->enabler = enabler; | |
1445 | /* Enforce length based on allocated size */ | |
1446 | bytecode_node->bc.len = bytecode_len; | |
1447 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1448 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1449 | return 0; | |
1450 | ||
1451 | error_free: | |
1452 | kfree(bytecode_node); | |
1453 | return ret; | |
1454 | } | |
1455 | ||
3c997079 MD |
1456 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1457 | struct lttng_kernel_context *context_param) | |
1458 | { | |
1459 | return -ENOSYS; | |
1460 | } | |
1461 | ||
1462 | static | |
1463 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1464 | { | |
07dfc1d0 MD |
1465 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1466 | ||
1467 | /* Destroy filter bytecode */ | |
1468 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1469 | &enabler->filter_bytecode_head, node) { | |
1470 | kfree(filter_node); | |
1471 | } | |
1472 | ||
3c997079 MD |
1473 | /* Destroy contexts */ |
1474 | lttng_destroy_context(enabler->ctx); | |
1475 | ||
1476 | list_del(&enabler->node); | |
1477 | kfree(enabler); | |
1478 | } | |
1479 | ||
1480 | /* | |
1481 | * lttng_session_sync_enablers should be called just before starting a | |
1482 | * session. | |
1483 | * Should be called with sessions mutex held. | |
1484 | */ | |
1485 | static | |
1486 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1487 | { | |
1488 | struct lttng_enabler *enabler; | |
1489 | struct lttng_event *event; | |
1490 | ||
1491 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1492 | lttng_enabler_ref_events(enabler); | |
1493 | /* | |
1494 | * For each event, if at least one of its enablers is enabled, | |
1495 | * and its channel and session transient states are enabled, we | |
1496 | * enable the event, else we disable it. | |
1497 | */ | |
1498 | list_for_each_entry(event, &session->events, list) { | |
1499 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1500 | struct lttng_bytecode_runtime *runtime; |
1501 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1502 | |
4ecb5ad5 MD |
1503 | switch (event->instrumentation) { |
1504 | case LTTNG_KERNEL_TRACEPOINT: | |
1505 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1506 | /* Enable events */ |
1507 | list_for_each_entry(enabler_ref, | |
1508 | &event->enablers_ref_head, node) { | |
1509 | if (enabler_ref->ref->enabled) { | |
1510 | enabled = 1; | |
1511 | break; | |
1512 | } | |
1513 | } | |
4ecb5ad5 MD |
1514 | break; |
1515 | default: | |
3c997079 MD |
1516 | /* Not handled with lazy sync. */ |
1517 | continue; | |
1518 | } | |
1519 | /* | |
1520 | * Enabled state is based on union of enablers, with | |
1521 | * intesection of session and channel transient enable | |
1522 | * states. | |
1523 | */ | |
1524 | enabled = enabled && session->tstate && event->chan->tstate; | |
1525 | ||
acb98454 | 1526 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1527 | /* |
1528 | * Sync tracepoint registration with event enabled | |
1529 | * state. | |
1530 | */ | |
1531 | if (enabled) { | |
1532 | register_event(event); | |
1533 | } else { | |
1534 | _lttng_event_unregister(event); | |
1535 | } | |
07dfc1d0 MD |
1536 | |
1537 | /* Check if has enablers without bytecode enabled */ | |
1538 | list_for_each_entry(enabler_ref, | |
1539 | &event->enablers_ref_head, node) { | |
1540 | if (enabler_ref->ref->enabled | |
1541 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1542 | has_enablers_without_bytecode = 1; | |
1543 | break; | |
1544 | } | |
1545 | } | |
1546 | event->has_enablers_without_bytecode = | |
1547 | has_enablers_without_bytecode; | |
1548 | ||
1549 | /* Enable filters */ | |
1550 | list_for_each_entry(runtime, | |
f127e61e | 1551 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1552 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1553 | } |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Apply enablers to session events, adding events to session if need | |
1558 | * be. It is required after each modification applied to an active | |
1559 | * session, and right before session "start". | |
1560 | * "lazy" sync means we only sync if required. | |
1561 | * Should be called with sessions mutex held. | |
1562 | */ | |
1563 | static | |
1564 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1565 | { | |
1566 | /* We can skip if session is not active */ | |
1567 | if (!session->active) | |
1568 | return; | |
1569 | lttng_session_sync_enablers(session); | |
1570 | } | |
1571 | ||
1ec3f75a | 1572 | /* |
d83004aa JD |
1573 | * Serialize at most one packet worth of metadata into a metadata |
1574 | * channel. | |
92d9f5e6 MD |
1575 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1576 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1577 | * allows us to do racy operations such as looking for remaining space left in | |
1578 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1579 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1580 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1581 | * Returns the number of bytes written in the channel, 0 if no data |
1582 | * was written and a negative value on error. | |
1ec3f75a | 1583 | */ |
b3b8072b MD |
1584 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1585 | struct channel *chan) | |
d83004aa JD |
1586 | { |
1587 | struct lib_ring_buffer_ctx ctx; | |
1588 | int ret = 0; | |
1589 | size_t len, reserve_len; | |
1590 | ||
f613e3e6 | 1591 | /* |
92d9f5e6 MD |
1592 | * Ensure we support mutiple get_next / put sequences followed by |
1593 | * put_next. The metadata cache lock protects reading the metadata | |
1594 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1595 | * "flush" operations on the buffer invoked by different processes. | |
1596 | * Moreover, since the metadata cache memory can be reallocated, we | |
1597 | * need to have exclusive access against updates even though we only | |
1598 | * read it. | |
f613e3e6 | 1599 | */ |
92d9f5e6 | 1600 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1601 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1602 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1603 | goto end; |
f613e3e6 | 1604 | |
9616f0bf JD |
1605 | /* Metadata regenerated, change the version. */ |
1606 | if (stream->metadata_cache->version != stream->version) | |
1607 | stream->version = stream->metadata_cache->version; | |
1608 | ||
d83004aa | 1609 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1610 | stream->metadata_in; |
9de2c215 | 1611 | if (!len) |
de23d59d | 1612 | goto end; |
d83004aa | 1613 | reserve_len = min_t(size_t, |
b3b8072b | 1614 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1615 | len); |
b3b8072b | 1616 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1617 | sizeof(char), -1); |
1618 | /* | |
1619 | * If reservation failed, return an error to the caller. | |
1620 | */ | |
b3b8072b | 1621 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1622 | if (ret != 0) { |
1623 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1624 | goto end; | |
1625 | } | |
b3b8072b | 1626 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1627 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1628 | reserve_len); |
b3b8072b | 1629 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1630 | stream->metadata_in += reserve_len; |
d83004aa JD |
1631 | ret = reserve_len; |
1632 | ||
1633 | end: | |
92d9f5e6 | 1634 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1635 | return ret; |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * Write the metadata to the metadata cache. | |
1640 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1641 | * The metadata cache lock protects us from concurrent read access from |
1642 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1643 | */ |
a90917c3 | 1644 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1645 | const char *fmt, ...) |
1646 | { | |
c099397a | 1647 | char *str; |
d83004aa | 1648 | size_t len; |
c099397a | 1649 | va_list ap; |
d83004aa | 1650 | struct lttng_metadata_stream *stream; |
c099397a | 1651 | |
acb98454 | 1652 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1653 | |
1654 | va_start(ap, fmt); | |
1655 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1656 | va_end(ap); | |
1657 | if (!str) | |
1658 | return -ENOMEM; | |
1659 | ||
1ec3f75a | 1660 | len = strlen(str); |
92d9f5e6 | 1661 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1662 | if (session->metadata_cache->metadata_written + len > |
1663 | session->metadata_cache->cache_alloc) { | |
1664 | char *tmp_cache_realloc; | |
1665 | unsigned int tmp_cache_alloc_size; | |
1666 | ||
1667 | tmp_cache_alloc_size = max_t(unsigned int, | |
1668 | session->metadata_cache->cache_alloc + len, | |
1669 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1670 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1671 | if (!tmp_cache_realloc) |
1672 | goto err; | |
a606b6e8 ML |
1673 | if (session->metadata_cache->data) { |
1674 | memcpy(tmp_cache_realloc, | |
1675 | session->metadata_cache->data, | |
1676 | session->metadata_cache->cache_alloc); | |
1677 | vfree(session->metadata_cache->data); | |
1678 | } | |
1679 | ||
d83004aa JD |
1680 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1681 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1682 | } |
d83004aa JD |
1683 | memcpy(session->metadata_cache->data + |
1684 | session->metadata_cache->metadata_written, | |
1685 | str, len); | |
1686 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1687 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1688 | kfree(str); |
d83004aa JD |
1689 | |
1690 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1691 | wake_up_interruptible(&stream->read_wait); | |
1692 | ||
1693 | return 0; | |
1694 | ||
1695 | err: | |
92d9f5e6 | 1696 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1697 | kfree(str); |
1698 | return -ENOMEM; | |
c099397a MD |
1699 | } |
1700 | ||
f513b2bf MD |
1701 | static |
1702 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1703 | { | |
1704 | size_t i; | |
1705 | ||
1706 | for (i = 0; i < nesting; i++) { | |
1707 | int ret; | |
1708 | ||
1709 | ret = lttng_metadata_printf(session, " "); | |
1710 | if (ret) { | |
1711 | return ret; | |
1712 | } | |
1713 | } | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Must be called with sessions_mutex held. | |
1719 | */ | |
1720 | static | |
1721 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1722 | const struct lttng_type *type, | |
1723 | size_t nesting) | |
1724 | { | |
1725 | int ret; | |
1726 | uint32_t i, nr_fields; | |
1727 | ||
1728 | ret = print_tabs(session, nesting); | |
1729 | if (ret) | |
1730 | return ret; | |
1731 | ret = lttng_metadata_printf(session, | |
1732 | "struct {\n"); | |
1733 | if (ret) | |
1734 | return ret; | |
1735 | nr_fields = type->u._struct.nr_fields; | |
1736 | for (i = 0; i < nr_fields; i++) { | |
1737 | const struct lttng_event_field *iter_field; | |
1738 | ||
1739 | iter_field = &type->u._struct.fields[i]; | |
1740 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1741 | if (ret) | |
1742 | return ret; | |
1743 | } | |
1744 | ret = print_tabs(session, nesting); | |
1745 | if (ret) | |
1746 | return ret; | |
1747 | ret = lttng_metadata_printf(session, | |
1748 | "}"); | |
1749 | return ret; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * Must be called with sessions_mutex held. | |
1754 | */ | |
1755 | static | |
1756 | int _lttng_struct_statedump(struct lttng_session *session, | |
1757 | const struct lttng_event_field *field, | |
1758 | size_t nesting) | |
1759 | { | |
1760 | int ret; | |
1761 | ||
1762 | ret = _lttng_struct_type_statedump(session, | |
1763 | &field->type, nesting); | |
1764 | if (ret) | |
1765 | return ret; | |
1766 | ret = lttng_metadata_printf(session, | |
1767 | "_%s;\n", | |
1768 | field->name); | |
1769 | return ret; | |
1770 | } | |
1771 | ||
65c85aa6 MD |
1772 | /* |
1773 | * Must be called with sessions_mutex held. | |
1774 | */ | |
1775 | static | |
1776 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1777 | const struct lttng_type *type, | |
1778 | size_t nesting) | |
1779 | { | |
1780 | int ret; | |
1781 | uint32_t i, nr_choices; | |
1782 | ||
1783 | ret = print_tabs(session, nesting); | |
1784 | if (ret) | |
1785 | return ret; | |
1786 | ret = lttng_metadata_printf(session, | |
1787 | "variant <_%s> {\n", | |
1788 | type->u.variant.tag_name); | |
1789 | if (ret) | |
1790 | return ret; | |
1791 | nr_choices = type->u.variant.nr_choices; | |
1792 | for (i = 0; i < nr_choices; i++) { | |
1793 | const struct lttng_event_field *iter_field; | |
1794 | ||
1795 | iter_field = &type->u.variant.choices[i]; | |
1796 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1797 | if (ret) | |
1798 | return ret; | |
1799 | } | |
1800 | ret = print_tabs(session, nesting); | |
1801 | if (ret) | |
1802 | return ret; | |
1803 | ret = lttng_metadata_printf(session, | |
1804 | "}"); | |
1805 | return ret; | |
1806 | } | |
1807 | ||
1808 | /* | |
1809 | * Must be called with sessions_mutex held. | |
1810 | */ | |
1811 | static | |
1812 | int _lttng_variant_statedump(struct lttng_session *session, | |
1813 | const struct lttng_event_field *field, | |
1814 | size_t nesting) | |
1815 | { | |
1816 | int ret; | |
1817 | ||
1818 | ret = _lttng_variant_type_statedump(session, | |
1819 | &field->type, nesting); | |
1820 | if (ret) | |
1821 | return ret; | |
1822 | ret = lttng_metadata_printf(session, | |
1823 | "_%s;\n", | |
1824 | field->name); | |
1825 | return ret; | |
1826 | } | |
1827 | ||
f513b2bf MD |
1828 | /* |
1829 | * Must be called with sessions_mutex held. | |
1830 | */ | |
1831 | static | |
1832 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1833 | const struct lttng_event_field *field, | |
1834 | size_t nesting) | |
1835 | { | |
1836 | int ret; | |
1837 | const struct lttng_type *elem_type; | |
1838 | ||
65c85aa6 | 1839 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1840 | elem_type = field->type.u.array_compound.elem_type; |
1841 | switch (elem_type->atype) { | |
1842 | case atype_struct: | |
1843 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1844 | if (ret) | |
1845 | return ret; | |
1846 | break; | |
65c85aa6 MD |
1847 | case atype_variant: |
1848 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1849 | if (ret) | |
1850 | return ret; | |
1851 | break; | |
f513b2bf MD |
1852 | default: |
1853 | return -EINVAL; | |
1854 | } | |
1855 | ret = lttng_metadata_printf(session, | |
1856 | " _%s[%u];\n", | |
1857 | field->name, | |
1858 | field->type.u.array_compound.length); | |
1859 | return ret; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * Must be called with sessions_mutex held. | |
1864 | */ | |
1865 | static | |
1866 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1867 | const struct lttng_event_field *field, | |
1868 | size_t nesting) | |
1869 | { | |
1870 | int ret; | |
1871 | const char *length_name; | |
1872 | const struct lttng_type *elem_type; | |
1873 | ||
1874 | length_name = field->type.u.sequence_compound.length_name; | |
1875 | ||
65c85aa6 | 1876 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1877 | elem_type = field->type.u.sequence_compound.elem_type; |
1878 | switch (elem_type->atype) { | |
1879 | case atype_struct: | |
1880 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1881 | if (ret) | |
1882 | return ret; | |
1883 | break; | |
65c85aa6 MD |
1884 | case atype_variant: |
1885 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1886 | if (ret) | |
1887 | return ret; | |
1888 | break; | |
f513b2bf MD |
1889 | default: |
1890 | return -EINVAL; | |
1891 | } | |
1892 | ret = lttng_metadata_printf(session, | |
1893 | " _%s[ _%s ];\n", | |
1894 | field->name, | |
1895 | length_name); | |
1896 | return ret; | |
1897 | } | |
1898 | ||
141ddf28 MD |
1899 | /* |
1900 | * Must be called with sessions_mutex held. | |
1901 | */ | |
1902 | static | |
1903 | int _lttng_enum_statedump(struct lttng_session *session, | |
1904 | const struct lttng_event_field *field, | |
1905 | size_t nesting) | |
1906 | { | |
1907 | const struct lttng_enum_desc *enum_desc; | |
1908 | const struct lttng_integer_type *container_type; | |
1909 | int ret; | |
1910 | unsigned int i, nr_entries; | |
1911 | ||
1912 | enum_desc = field->type.u.basic.enumeration.desc; | |
1913 | container_type = &field->type.u.basic.enumeration.container_type; | |
1914 | nr_entries = enum_desc->nr_entries; | |
1915 | ||
1916 | ret = print_tabs(session, nesting); | |
1917 | if (ret) | |
1918 | goto end; | |
1919 | ret = lttng_metadata_printf(session, | |
578e68ec | 1920 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1921 | container_type->size, |
1922 | container_type->alignment, | |
1923 | container_type->signedness, | |
1924 | (container_type->encoding == lttng_encode_none) | |
1925 | ? "none" | |
1926 | : (container_type->encoding == lttng_encode_UTF8) | |
1927 | ? "UTF8" | |
1928 | : "ASCII", | |
578e68ec GB |
1929 | container_type->base, |
1930 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1931 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1932 | #else | |
1933 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1934 | #endif | |
1935 | ); | |
141ddf28 MD |
1936 | if (ret) |
1937 | goto end; | |
1938 | /* Dump all entries */ | |
1939 | for (i = 0; i < nr_entries; i++) { | |
1940 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1941 | int j, len; | |
1942 | ||
1943 | ret = print_tabs(session, nesting + 1); | |
1944 | if (ret) | |
1945 | goto end; | |
1946 | ret = lttng_metadata_printf(session, | |
1947 | "\""); | |
1948 | if (ret) | |
1949 | goto end; | |
1950 | len = strlen(entry->string); | |
1951 | /* Escape the character '"' */ | |
1952 | for (j = 0; j < len; j++) { | |
1953 | char c = entry->string[j]; | |
1954 | ||
1955 | switch (c) { | |
1956 | case '"': | |
1957 | ret = lttng_metadata_printf(session, | |
1958 | "\\\""); | |
1959 | break; | |
1960 | case '\\': | |
1961 | ret = lttng_metadata_printf(session, | |
1962 | "\\\\"); | |
1963 | break; | |
1964 | default: | |
1965 | ret = lttng_metadata_printf(session, | |
1966 | "%c", c); | |
1967 | break; | |
1968 | } | |
1969 | if (ret) | |
1970 | goto end; | |
1971 | } | |
08ad1061 PP |
1972 | ret = lttng_metadata_printf(session, "\""); |
1973 | if (ret) | |
1974 | goto end; | |
1975 | ||
1976 | if (entry->options.is_auto) { | |
1977 | ret = lttng_metadata_printf(session, ",\n"); | |
1978 | if (ret) | |
1979 | goto end; | |
141ddf28 | 1980 | } else { |
7c559490 MD |
1981 | ret = lttng_metadata_printf(session, |
1982 | " = "); | |
1983 | if (ret) | |
1984 | goto end; | |
1985 | if (entry->start.signedness) | |
141ddf28 | 1986 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1987 | "%lld", (long long) entry->start.value); |
1988 | else | |
1989 | ret = lttng_metadata_printf(session, | |
1990 | "%llu", entry->start.value); | |
1991 | if (ret) | |
1992 | goto end; | |
1993 | if (entry->start.signedness == entry->end.signedness && | |
1994 | entry->start.value | |
1995 | == entry->end.value) { | |
141ddf28 | 1996 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1997 | ",\n"); |
1998 | } else { | |
1999 | if (entry->end.signedness) { | |
2000 | ret = lttng_metadata_printf(session, | |
2001 | " ... %lld,\n", | |
2002 | (long long) entry->end.value); | |
2003 | } else { | |
2004 | ret = lttng_metadata_printf(session, | |
2005 | " ... %llu,\n", | |
2006 | entry->end.value); | |
2007 | } | |
141ddf28 | 2008 | } |
7c559490 MD |
2009 | if (ret) |
2010 | goto end; | |
141ddf28 | 2011 | } |
141ddf28 MD |
2012 | } |
2013 | ret = print_tabs(session, nesting); | |
2014 | if (ret) | |
2015 | goto end; | |
2016 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2017 | field->name); | |
2018 | end: | |
2019 | return ret; | |
2020 | } | |
2021 | ||
d83004aa JD |
2022 | /* |
2023 | * Must be called with sessions_mutex held. | |
2024 | */ | |
c099397a | 2025 | static |
a90917c3 | 2026 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2027 | const struct lttng_event_field *field, |
2028 | size_t nesting) | |
c099397a | 2029 | { |
c099397a | 2030 | int ret = 0; |
c099397a | 2031 | |
8070f5c0 MD |
2032 | switch (field->type.atype) { |
2033 | case atype_integer: | |
f513b2bf MD |
2034 | ret = print_tabs(session, nesting); |
2035 | if (ret) | |
2036 | return ret; | |
8070f5c0 | 2037 | ret = lttng_metadata_printf(session, |
f513b2bf | 2038 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2039 | field->type.u.basic.integer.size, |
2040 | field->type.u.basic.integer.alignment, | |
2041 | field->type.u.basic.integer.signedness, | |
2042 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2043 | ? "none" | |
2044 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2045 | ? "UTF8" | |
2046 | : "ASCII", | |
2047 | field->type.u.basic.integer.base, | |
5214fa50 | 2048 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2049 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2050 | #else |
8070f5c0 | 2051 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2052 | #endif |
8070f5c0 MD |
2053 | field->name); |
2054 | break; | |
2055 | case atype_enum: | |
141ddf28 | 2056 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2057 | break; |
2058 | case atype_array: | |
2059 | { | |
2060 | const struct lttng_basic_type *elem_type; | |
2061 | ||
2062 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2063 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2064 | ret = print_tabs(session, nesting); |
2065 | if (ret) | |
2066 | return ret; | |
43803cf2 | 2067 | ret = lttng_metadata_printf(session, |
f513b2bf | 2068 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2069 | field->type.u.array.elem_alignment * CHAR_BIT, |
2070 | field->name); | |
2071 | if (ret) | |
2072 | return ret; | |
2073 | } | |
f513b2bf MD |
2074 | ret = print_tabs(session, nesting); |
2075 | if (ret) | |
2076 | return ret; | |
8070f5c0 | 2077 | ret = lttng_metadata_printf(session, |
f513b2bf | 2078 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2079 | elem_type->u.basic.integer.size, |
2080 | elem_type->u.basic.integer.alignment, | |
2081 | elem_type->u.basic.integer.signedness, | |
2082 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2083 | ? "none" | |
2084 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2085 | ? "UTF8" | |
2086 | : "ASCII", | |
2087 | elem_type->u.basic.integer.base, | |
5214fa50 | 2088 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2089 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2090 | #else |
8070f5c0 | 2091 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2092 | #endif |
8070f5c0 MD |
2093 | field->name, field->type.u.array.length); |
2094 | break; | |
2095 | } | |
2096 | case atype_sequence: | |
2097 | { | |
2098 | const struct lttng_basic_type *elem_type; | |
2099 | const struct lttng_basic_type *length_type; | |
2100 | ||
2101 | elem_type = &field->type.u.sequence.elem_type; | |
2102 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2103 | ret = print_tabs(session, nesting); |
2104 | if (ret) | |
2105 | return ret; | |
8070f5c0 | 2106 | ret = lttng_metadata_printf(session, |
f513b2bf | 2107 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2108 | length_type->u.basic.integer.size, |
32257272 | 2109 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2110 | length_type->u.basic.integer.signedness, |
2111 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2112 | ? "none" | |
0635cdd4 | 2113 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2114 | ? "UTF8" |
0635cdd4 | 2115 | : "ASCII"), |
8070f5c0 | 2116 | length_type->u.basic.integer.base, |
5214fa50 | 2117 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2118 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2119 | #else |
0635cdd4 | 2120 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2121 | #endif |
27d2368e MD |
2122 | field->name); |
2123 | if (ret) | |
2124 | return ret; | |
2125 | ||
43803cf2 | 2126 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2127 | ret = print_tabs(session, nesting); |
2128 | if (ret) | |
2129 | return ret; | |
43803cf2 | 2130 | ret = lttng_metadata_printf(session, |
f513b2bf | 2131 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2132 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2133 | field->name); | |
2134 | if (ret) | |
2135 | return ret; | |
2136 | } | |
f513b2bf MD |
2137 | ret = print_tabs(session, nesting); |
2138 | if (ret) | |
2139 | return ret; | |
27d2368e | 2140 | ret = lttng_metadata_printf(session, |
f513b2bf | 2141 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2142 | elem_type->u.basic.integer.size, |
32257272 | 2143 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2144 | elem_type->u.basic.integer.signedness, |
2145 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2146 | ? "none" | |
0635cdd4 | 2147 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2148 | ? "UTF8" |
0635cdd4 | 2149 | : "ASCII"), |
8070f5c0 | 2150 | elem_type->u.basic.integer.base, |
5214fa50 | 2151 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2152 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2153 | #else |
8070f5c0 | 2154 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2155 | #endif |
8070f5c0 | 2156 | field->name, |
27d2368e | 2157 | field->name); |
8070f5c0 MD |
2158 | break; |
2159 | } | |
c099397a | 2160 | |
8070f5c0 MD |
2161 | case atype_string: |
2162 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2163 | ret = print_tabs(session, nesting); |
2164 | if (ret) | |
2165 | return ret; | |
8070f5c0 | 2166 | ret = lttng_metadata_printf(session, |
f513b2bf | 2167 | "string%s _%s;\n", |
8070f5c0 MD |
2168 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2169 | " { encoding = ASCII; }" : "", | |
2170 | field->name); | |
2171 | break; | |
f513b2bf MD |
2172 | case atype_struct: |
2173 | ret = _lttng_struct_statedump(session, field, nesting); | |
2174 | break; | |
2175 | case atype_array_compound: | |
2176 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2177 | break; | |
2178 | case atype_sequence_compound: | |
2179 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2180 | break; | |
65c85aa6 MD |
2181 | case atype_variant: |
2182 | ret = _lttng_variant_statedump(session, field, nesting); | |
2183 | break; | |
f513b2bf | 2184 | |
8070f5c0 MD |
2185 | default: |
2186 | WARN_ON_ONCE(1); | |
2187 | return -EINVAL; | |
2188 | } | |
2189 | return ret; | |
2190 | } | |
2191 | ||
2192 | static | |
a90917c3 | 2193 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2194 | struct lttng_ctx *ctx) |
2195 | { | |
2196 | int ret = 0; | |
2197 | int i; | |
2198 | ||
2199 | if (!ctx) | |
2200 | return 0; | |
2201 | for (i = 0; i < ctx->nr_fields; i++) { | |
2202 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2203 | ||
f513b2bf | 2204 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2205 | if (ret) |
2206 | return ret; | |
2207 | } | |
2208 | return ret; | |
2209 | } | |
2210 | ||
2211 | static | |
a90917c3 MD |
2212 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2213 | struct lttng_event *event) | |
8070f5c0 MD |
2214 | { |
2215 | const struct lttng_event_desc *desc = event->desc; | |
2216 | int ret = 0; | |
2217 | int i; | |
2218 | ||
2219 | for (i = 0; i < desc->nr_fields; i++) { | |
2220 | const struct lttng_event_field *field = &desc->fields[i]; | |
2221 | ||
f513b2bf | 2222 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2223 | if (ret) |
2224 | return ret; | |
c099397a MD |
2225 | } |
2226 | return ret; | |
2227 | } | |
2228 | ||
d83004aa JD |
2229 | /* |
2230 | * Must be called with sessions_mutex held. | |
2231 | */ | |
c099397a | 2232 | static |
a90917c3 MD |
2233 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2234 | struct lttng_channel *chan, | |
2235 | struct lttng_event *event) | |
c099397a MD |
2236 | { |
2237 | int ret = 0; | |
2238 | ||
acb98454 | 2239 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2240 | return 0; |
d83004aa | 2241 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2242 | return 0; |
2243 | ||
2244 | ret = lttng_metadata_printf(session, | |
2245 | "event {\n" | |
ae734547 | 2246 | " name = \"%s\";\n" |
c099397a | 2247 | " id = %u;\n" |
b9074a1b | 2248 | " stream_id = %u;\n", |
c099397a MD |
2249 | event->desc->name, |
2250 | event->id, | |
2251 | event->chan->id); | |
2252 | if (ret) | |
2253 | goto end; | |
2254 | ||
b9074a1b MD |
2255 | if (event->ctx) { |
2256 | ret = lttng_metadata_printf(session, | |
2257 | " context := struct {\n"); | |
2258 | if (ret) | |
2259 | goto end; | |
2260 | } | |
a90917c3 | 2261 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2262 | if (ret) |
2263 | goto end; | |
b9074a1b MD |
2264 | if (event->ctx) { |
2265 | ret = lttng_metadata_printf(session, | |
2266 | " };\n"); | |
2267 | if (ret) | |
2268 | goto end; | |
2269 | } | |
8070f5c0 MD |
2270 | |
2271 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2272 | " fields := struct {\n" |
2273 | ); | |
2274 | if (ret) | |
2275 | goto end; | |
2276 | ||
a90917c3 | 2277 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2278 | if (ret) |
2279 | goto end; | |
2280 | ||
2281 | /* | |
2282 | * LTTng space reservation can only reserve multiples of the | |
2283 | * byte size. | |
2284 | */ | |
2285 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2286 | " };\n" |
2287 | "};\n\n"); | |
c099397a MD |
2288 | if (ret) |
2289 | goto end; | |
2290 | ||
c099397a MD |
2291 | event->metadata_dumped = 1; |
2292 | end: | |
2293 | return ret; | |
2294 | ||
2295 | } | |
2296 | ||
d83004aa JD |
2297 | /* |
2298 | * Must be called with sessions_mutex held. | |
2299 | */ | |
c099397a | 2300 | static |
a90917c3 MD |
2301 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2302 | struct lttng_channel *chan) | |
c099397a MD |
2303 | { |
2304 | int ret = 0; | |
2305 | ||
acb98454 | 2306 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2307 | return 0; |
d83004aa JD |
2308 | |
2309 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2310 | return 0; |
2311 | ||
2312 | WARN_ON_ONCE(!chan->header_type); | |
2313 | ret = lttng_metadata_printf(session, | |
2314 | "stream {\n" | |
2315 | " id = %u;\n" | |
9115fbdc | 2316 | " event.header := %s;\n" |
b9074a1b | 2317 | " packet.context := struct packet_context;\n", |
c099397a MD |
2318 | chan->id, |
2319 | chan->header_type == 1 ? "struct event_header_compact" : | |
2320 | "struct event_header_large"); | |
2321 | if (ret) | |
2322 | goto end; | |
2323 | ||
b9074a1b MD |
2324 | if (chan->ctx) { |
2325 | ret = lttng_metadata_printf(session, | |
2326 | " event.context := struct {\n"); | |
2327 | if (ret) | |
2328 | goto end; | |
2329 | } | |
a90917c3 | 2330 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2331 | if (ret) |
2332 | goto end; | |
b9074a1b MD |
2333 | if (chan->ctx) { |
2334 | ret = lttng_metadata_printf(session, | |
2335 | " };\n"); | |
2336 | if (ret) | |
2337 | goto end; | |
2338 | } | |
8070f5c0 MD |
2339 | |
2340 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2341 | "};\n\n"); |
8070f5c0 | 2342 | |
c099397a MD |
2343 | chan->metadata_dumped = 1; |
2344 | end: | |
2345 | return ret; | |
2346 | } | |
2347 | ||
d83004aa JD |
2348 | /* |
2349 | * Must be called with sessions_mutex held. | |
2350 | */ | |
9115fbdc | 2351 | static |
a90917c3 | 2352 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2353 | { |
2354 | return lttng_metadata_printf(session, | |
2355 | "struct packet_context {\n" | |
a3ccff4f MD |
2356 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2357 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2358 | " uint64_t content_size;\n" |
2359 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2360 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2361 | " unsigned long events_discarded;\n" |
9115fbdc | 2362 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2363 | "};\n\n" |
9115fbdc MD |
2364 | ); |
2365 | } | |
2366 | ||
2367 | /* | |
2368 | * Compact header: | |
2369 | * id: range: 0 - 30. | |
2370 | * id 31 is reserved to indicate an extended header. | |
2371 | * | |
2372 | * Large header: | |
2373 | * id: range: 0 - 65534. | |
2374 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2375 | * |
2376 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2377 | */ |
2378 | static | |
a90917c3 | 2379 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2380 | { |
2381 | return lttng_metadata_printf(session, | |
2382 | "struct event_header_compact {\n" | |
2383 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2384 | " variant <id> {\n" | |
2385 | " struct {\n" | |
a3ccff4f | 2386 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2387 | " } compact;\n" |
2388 | " struct {\n" | |
2389 | " uint32_t id;\n" | |
a3ccff4f | 2390 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2391 | " } extended;\n" |
2392 | " } v;\n" | |
2393 | "} align(%u);\n" | |
2394 | "\n" | |
2395 | "struct event_header_large {\n" | |
2396 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2397 | " variant <id> {\n" | |
2398 | " struct {\n" | |
a3ccff4f | 2399 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2400 | " } compact;\n" |
2401 | " struct {\n" | |
2402 | " uint32_t id;\n" | |
a3ccff4f | 2403 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2404 | " } extended;\n" |
2405 | " } v;\n" | |
2406 | "} align(%u);\n\n", | |
a90917c3 MD |
2407 | lttng_alignof(uint32_t) * CHAR_BIT, |
2408 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2409 | ); |
2410 | } | |
2411 | ||
a3ccff4f MD |
2412 | /* |
2413 | * Approximation of NTP time of day to clock monotonic correlation, | |
2414 | * taken at start of trace. | |
2415 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2416 | * in future versions. | |
5283350b MD |
2417 | * This function may return a negative offset. It may happen if the |
2418 | * system sets the REALTIME clock to 0 after boot. | |
0ff00f07 MJ |
2419 | * |
2420 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2421 | * y2038 compliant. | |
a3ccff4f MD |
2422 | */ |
2423 | static | |
8967b2a3 | 2424 | int64_t measure_clock_offset(void) |
a3ccff4f | 2425 | { |
dcb93448 | 2426 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2427 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2428 | int64_t offset; |
a3ccff4f | 2429 | unsigned long flags; |
0ff00f07 MJ |
2430 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2431 | struct timespec64 rts = { 0, 0 }; | |
2432 | #else | |
2433 | struct timespec rts = { 0, 0 }; | |
2434 | #endif | |
a3ccff4f MD |
2435 | |
2436 | /* Disable interrupts to increase correlation precision. */ | |
2437 | local_irq_save(flags); | |
2438 | monotonic[0] = trace_clock_read64(); | |
0ff00f07 MJ |
2439 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2440 | ktime_get_real_ts64(&rts); | |
2441 | #else | |
216b6baa | 2442 | getnstimeofday(&rts); |
0ff00f07 | 2443 | #endif |
a3ccff4f MD |
2444 | monotonic[1] = trace_clock_read64(); |
2445 | local_irq_restore(flags); | |
2446 | ||
dcb93448 | 2447 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2448 | realtime = (uint64_t) rts.tv_sec * tcf; |
2449 | if (tcf == NSEC_PER_SEC) { | |
2450 | realtime += rts.tv_nsec; | |
2451 | } else { | |
2452 | uint64_t n = rts.tv_nsec * tcf; | |
2453 | ||
2454 | do_div(n, NSEC_PER_SEC); | |
2455 | realtime += n; | |
2456 | } | |
dcb93448 | 2457 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2458 | return offset; |
2459 | } | |
2460 | ||
c099397a MD |
2461 | /* |
2462 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2463 | * Must be called with sessions_mutex held. |
c099397a MD |
2464 | */ |
2465 | static | |
a90917c3 | 2466 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2467 | { |
30bdb6e4 | 2468 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2469 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2470 | struct lttng_channel *chan; |
2471 | struct lttng_event *event; | |
c099397a MD |
2472 | int ret = 0; |
2473 | ||
acb98454 | 2474 | if (!READ_ONCE(session->active)) |
c099397a MD |
2475 | return 0; |
2476 | if (session->metadata_dumped) | |
2477 | goto skip_session; | |
c099397a | 2478 | |
d793d5e1 | 2479 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2480 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2481 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2482 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2483 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2484 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2485 | |
2486 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2487 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2488 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2489 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2490 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2491 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2492 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2493 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2494 | "\n" |
2495 | "trace {\n" | |
2496 | " major = %u;\n" | |
2497 | " minor = %u;\n" | |
30bdb6e4 | 2498 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2499 | " byte_order = %s;\n" |
2500 | " packet.header := struct {\n" | |
2501 | " uint32_t magic;\n" | |
1ec3f75a | 2502 | " uint8_t uuid[16];\n" |
d793d5e1 | 2503 | " uint32_t stream_id;\n" |
5594698f | 2504 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2505 | " };\n" |
d793d5e1 | 2506 | "};\n\n", |
a90917c3 MD |
2507 | lttng_alignof(uint8_t) * CHAR_BIT, |
2508 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2509 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2510 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2511 | sizeof(unsigned long) * CHAR_BIT, |
2512 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2513 | CTF_SPEC_MAJOR, |
2514 | CTF_SPEC_MINOR, | |
d793d5e1 | 2515 | uuid_s, |
5214fa50 | 2516 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2517 | "be" |
2518 | #else | |
2519 | "le" | |
2520 | #endif | |
2521 | ); | |
2522 | if (ret) | |
2523 | goto end; | |
2524 | ||
99dc9597 MD |
2525 | ret = lttng_metadata_printf(session, |
2526 | "env {\n" | |
a6058143 | 2527 | " hostname = \"%s\";\n" |
c6c9e10f | 2528 | " domain = \"kernel\";\n" |
99dc9597 | 2529 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2530 | " kernel_release = \"%s\";\n" |
2531 | " kernel_version = \"%s\";\n" | |
2532 | " tracer_name = \"lttng-modules\";\n" | |
2533 | " tracer_major = %d;\n" | |
2534 | " tracer_minor = %d;\n" | |
2535 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2536 | "};\n\n", |
3d0d43db | 2537 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2538 | utsname()->sysname, |
2539 | utsname()->release, | |
c6c9e10f MD |
2540 | utsname()->version, |
2541 | LTTNG_MODULES_MAJOR_VERSION, | |
2542 | LTTNG_MODULES_MINOR_VERSION, | |
2543 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2544 | ); |
2545 | if (ret) | |
2546 | goto end; | |
2547 | ||
a3ccff4f MD |
2548 | ret = lttng_metadata_printf(session, |
2549 | "clock {\n" | |
2754583e MD |
2550 | " name = \"%s\";\n", |
2551 | trace_clock_name() | |
a82c63f1 MD |
2552 | ); |
2553 | if (ret) | |
2554 | goto end; | |
2555 | ||
2556 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2557 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2558 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2559 | clock_uuid_s |
2560 | ); | |
2561 | if (ret) | |
2562 | goto end; | |
2563 | } | |
2564 | ||
2565 | ret = lttng_metadata_printf(session, | |
2754583e | 2566 | " description = \"%s\";\n" |
a3ccff4f MD |
2567 | " freq = %llu; /* Frequency, in Hz */\n" |
2568 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2569 | " offset = %lld;\n" |
a3ccff4f | 2570 | "};\n\n", |
2754583e | 2571 | trace_clock_description(), |
a3ccff4f | 2572 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2573 | (long long) measure_clock_offset() |
a3ccff4f MD |
2574 | ); |
2575 | if (ret) | |
2576 | goto end; | |
2577 | ||
2578 | ret = lttng_metadata_printf(session, | |
2579 | "typealias integer {\n" | |
2580 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2581 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2582 | "} := uint27_clock_monotonic_t;\n" |
2583 | "\n" | |
2584 | "typealias integer {\n" | |
2585 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2586 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2587 | "} := uint32_clock_monotonic_t;\n" |
2588 | "\n" | |
2589 | "typealias integer {\n" | |
2590 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2591 | " map = clock.%s.value;\n" |
a3ccff4f | 2592 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2593 | trace_clock_name(), |
a3ccff4f | 2594 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2595 | trace_clock_name(), |
2596 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2597 | trace_clock_name() | |
a3ccff4f MD |
2598 | ); |
2599 | if (ret) | |
2600 | goto end; | |
2601 | ||
a90917c3 | 2602 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2603 | if (ret) |
2604 | goto end; | |
2605 | ||
a90917c3 | 2606 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2607 | if (ret) |
2608 | goto end; | |
2609 | ||
c099397a MD |
2610 | skip_session: |
2611 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2612 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2613 | if (ret) |
2614 | goto end; | |
2615 | } | |
2616 | ||
2617 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2618 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2619 | if (ret) |
2620 | goto end; | |
2621 | } | |
2622 | session->metadata_dumped = 1; | |
2623 | end: | |
2624 | return ret; | |
2625 | } | |
2626 | ||
c0e31d2e | 2627 | /** |
a90917c3 | 2628 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2629 | * @transport: transport structure |
2630 | * | |
2631 | * Registers a transport which can be used as output to extract the data out of | |
2632 | * LTTng. The module calling this registration function must ensure that no | |
2633 | * trap-inducing code will be executed by the transport functions. E.g. | |
2634 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2635 | * is made visible to the transport function. This registration acts as a | |
2636 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2637 | * after its registration must it synchronize the TLBs. | |
2638 | */ | |
a90917c3 | 2639 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2640 | { |
2641 | /* | |
2642 | * Make sure no page fault can be triggered by the module about to be | |
2643 | * registered. We deal with this here so we don't have to call | |
2644 | * vmalloc_sync_all() in each module's init. | |
2645 | */ | |
6d2a620c | 2646 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2647 | |
2648 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2649 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2650 | mutex_unlock(&sessions_mutex); |
2651 | } | |
a90917c3 | 2652 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2653 | |
2654 | /** | |
a90917c3 | 2655 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2656 | * @transport: transport structure |
2657 | */ | |
a90917c3 | 2658 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2659 | { |
2660 | mutex_lock(&sessions_mutex); | |
2661 | list_del(&transport->node); | |
2662 | mutex_unlock(&sessions_mutex); | |
2663 | } | |
a90917c3 | 2664 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2665 | |
1759a734 | 2666 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2667 | |
2668 | enum cpuhp_state lttng_hp_prepare; | |
2669 | enum cpuhp_state lttng_hp_online; | |
2670 | ||
2671 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2672 | { | |
2673 | struct lttng_cpuhp_node *lttng_node; | |
2674 | ||
2675 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2676 | switch (lttng_node->component) { | |
2677 | case LTTNG_RING_BUFFER_FRONTEND: | |
2678 | return 0; | |
2679 | case LTTNG_RING_BUFFER_BACKEND: | |
2680 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2681 | case LTTNG_RING_BUFFER_ITER: | |
2682 | return 0; | |
2683 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2684 | return 0; | |
2685 | default: | |
2686 | return -EINVAL; | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2691 | { | |
2692 | struct lttng_cpuhp_node *lttng_node; | |
2693 | ||
2694 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2695 | switch (lttng_node->component) { | |
2696 | case LTTNG_RING_BUFFER_FRONTEND: | |
2697 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2698 | case LTTNG_RING_BUFFER_BACKEND: | |
2699 | return 0; | |
2700 | case LTTNG_RING_BUFFER_ITER: | |
2701 | return 0; | |
2702 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2703 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2704 | default: | |
2705 | return -EINVAL; | |
2706 | } | |
2707 | } | |
2708 | ||
2709 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2710 | { | |
2711 | struct lttng_cpuhp_node *lttng_node; | |
2712 | ||
2713 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2714 | switch (lttng_node->component) { | |
2715 | case LTTNG_RING_BUFFER_FRONTEND: | |
2716 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2717 | case LTTNG_RING_BUFFER_BACKEND: | |
2718 | return 0; | |
2719 | case LTTNG_RING_BUFFER_ITER: | |
2720 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2721 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2722 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2723 | default: | |
2724 | return -EINVAL; | |
2725 | } | |
2726 | } | |
2727 | ||
2728 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2729 | { | |
2730 | struct lttng_cpuhp_node *lttng_node; | |
2731 | ||
2732 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2733 | switch (lttng_node->component) { | |
2734 | case LTTNG_RING_BUFFER_FRONTEND: | |
2735 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2736 | case LTTNG_RING_BUFFER_BACKEND: | |
2737 | return 0; | |
2738 | case LTTNG_RING_BUFFER_ITER: | |
2739 | return 0; | |
2740 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2741 | return 0; | |
2742 | default: | |
2743 | return -EINVAL; | |
2744 | } | |
2745 | } | |
2746 | ||
2747 | static int __init lttng_init_cpu_hotplug(void) | |
2748 | { | |
2749 | int ret; | |
2750 | ||
2751 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2752 | lttng_hotplug_prepare, | |
2753 | lttng_hotplug_dead); | |
2754 | if (ret < 0) { | |
2755 | return ret; | |
2756 | } | |
2757 | lttng_hp_prepare = ret; | |
2758 | lttng_rb_set_hp_prepare(ret); | |
2759 | ||
2760 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2761 | lttng_hotplug_online, | |
2762 | lttng_hotplug_offline); | |
2763 | if (ret < 0) { | |
2764 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2765 | lttng_hp_prepare = 0; | |
2766 | return ret; | |
2767 | } | |
2768 | lttng_hp_online = ret; | |
2769 | lttng_rb_set_hp_online(ret); | |
2770 | ||
2771 | return 0; | |
2772 | } | |
2773 | ||
2774 | static void __exit lttng_exit_cpu_hotplug(void) | |
2775 | { | |
2776 | lttng_rb_set_hp_online(0); | |
2777 | cpuhp_remove_multi_state(lttng_hp_online); | |
2778 | lttng_rb_set_hp_prepare(0); | |
2779 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2780 | } | |
2781 | ||
00e00f24 | 2782 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2783 | static int lttng_init_cpu_hotplug(void) |
2784 | { | |
2785 | return 0; | |
2786 | } | |
2787 | static void lttng_exit_cpu_hotplug(void) | |
2788 | { | |
2789 | } | |
00e00f24 | 2790 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2791 | |
2792 | ||
a90917c3 | 2793 | static int __init lttng_events_init(void) |
4e3c1b9b | 2794 | { |
1c25284c MD |
2795 | int ret; |
2796 | ||
453b2495 JD |
2797 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2798 | if (ret) | |
2799 | return ret; | |
389d7070 | 2800 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2801 | if (ret) |
2802 | return ret; | |
2803 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2804 | if (ret) |
2805 | return ret; | |
2806 | ret = lttng_probes_init(); | |
389d7070 MD |
2807 | if (ret) |
2808 | return ret; | |
07dfc1d0 | 2809 | ret = lttng_context_init(); |
20591cf7 MD |
2810 | if (ret) |
2811 | return ret; | |
07dfc1d0 MD |
2812 | ret = lttng_tracepoint_init(); |
2813 | if (ret) | |
2814 | goto error_tp; | |
a90917c3 | 2815 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2816 | if (!event_cache) { |
2817 | ret = -ENOMEM; | |
2818 | goto error_kmem; | |
2819 | } | |
80996790 | 2820 | ret = lttng_abi_init(); |
02119ee5 MD |
2821 | if (ret) |
2822 | goto error_abi; | |
0c956676 MD |
2823 | ret = lttng_logger_init(); |
2824 | if (ret) | |
2825 | goto error_logger; | |
1e367326 MD |
2826 | ret = lttng_init_cpu_hotplug(); |
2827 | if (ret) | |
2828 | goto error_hotplug; | |
2df5d4b7 | 2829 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2830 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2831 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2832 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2833 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2834 | LTTNG_VERSION_NAME, |
2835 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2836 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2837 | #else | |
2838 | "", | |
2839 | #endif | |
2840 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2841 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2842 | #else | |
2843 | ""); | |
2844 | #endif | |
4e3c1b9b | 2845 | return 0; |
0c956676 | 2846 | |
1e367326 MD |
2847 | error_hotplug: |
2848 | lttng_logger_exit(); | |
0c956676 MD |
2849 | error_logger: |
2850 | lttng_abi_exit(); | |
02119ee5 | 2851 | error_abi: |
1c25284c | 2852 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2853 | error_kmem: |
2854 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2855 | error_tp: |
2856 | lttng_context_exit(); | |
2df5d4b7 | 2857 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2858 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2859 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2860 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2861 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2862 | LTTNG_VERSION_NAME, |
2863 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2864 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2865 | #else | |
2866 | "", | |
2867 | #endif | |
2868 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2869 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2870 | #else | |
2871 | ""); | |
2872 | #endif | |
1c25284c | 2873 | return ret; |
4e3c1b9b MD |
2874 | } |
2875 | ||
a90917c3 | 2876 | module_init(lttng_events_init); |
11b5a3c2 | 2877 | |
a90917c3 | 2878 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2879 | { |
a90917c3 | 2880 | struct lttng_session *session, *tmpsession; |
92e94819 | 2881 | |
1e367326 | 2882 | lttng_exit_cpu_hotplug(); |
0c956676 | 2883 | lttng_logger_exit(); |
80996790 | 2884 | lttng_abi_exit(); |
92e94819 | 2885 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2886 | lttng_session_destroy(session); |
11b5a3c2 | 2887 | kmem_cache_destroy(event_cache); |
20591cf7 | 2888 | lttng_tracepoint_exit(); |
07dfc1d0 | 2889 | lttng_context_exit(); |
2df5d4b7 | 2890 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2891 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2892 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2893 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2894 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2895 | LTTNG_VERSION_NAME, |
2896 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2897 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2898 | #else | |
2899 | "", | |
2900 | #endif | |
2901 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2902 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2903 | #else | |
2904 | ""); | |
2905 | #endif | |
4e3c1b9b | 2906 | } |
92e94819 | 2907 | |
a90917c3 | 2908 | module_exit(lttng_events_exit); |
11b5a3c2 | 2909 | |
2df5d4b7 MJ |
2910 | #include "extra_version/patches.i" |
2911 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2912 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2913 | #endif | |
2914 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2915 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2916 | #endif | |
92e94819 MD |
2917 | MODULE_LICENSE("GPL and additional rights"); |
2918 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2919 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2920 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2921 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2922 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2923 | LTTNG_MODULES_EXTRAVERSION); |