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> | |
4e3c1b9b | 59 | |
d83004aa JD |
60 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
61 | ||
4e3c1b9b | 62 | static LIST_HEAD(sessions); |
a90917c3 | 63 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
64 | /* |
65 | * Protect the sessions and metadata caches. | |
66 | */ | |
4e3c1b9b MD |
67 | static DEFINE_MUTEX(sessions_mutex); |
68 | static struct kmem_cache *event_cache; | |
69 | ||
3c997079 MD |
70 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
71 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
72 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
73 | ||
a90917c3 MD |
74 | static void _lttng_event_destroy(struct lttng_event *event); |
75 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
76 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 77 | static |
a90917c3 MD |
78 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
79 | struct lttng_channel *chan, | |
80 | struct lttng_event *event); | |
c099397a | 81 | static |
a90917c3 | 82 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
83 | static |
84 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
85 | static |
86 | int _lttng_field_statedump(struct lttng_session *session, | |
87 | const struct lttng_event_field *field, | |
88 | size_t nesting); | |
c099397a | 89 | |
c099397a | 90 | void synchronize_trace(void) |
abcca994 | 91 | { |
06980203 MJ |
92 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
93 | synchronize_rcu(); | |
94 | #else | |
abcca994 | 95 | synchronize_sched(); |
06980203 MJ |
96 | #endif |
97 | ||
b8590f40 MD |
98 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
99 | #ifdef CONFIG_PREEMPT_RT_FULL | |
100 | synchronize_rcu(); | |
101 | #endif | |
102 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
103 | #ifdef CONFIG_PREEMPT_RT |
104 | synchronize_rcu(); | |
105 | #endif | |
b8590f40 | 106 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | } |
108 | ||
3c997079 MD |
109 | void lttng_lock_sessions(void) |
110 | { | |
111 | mutex_lock(&sessions_mutex); | |
112 | } | |
113 | ||
114 | void lttng_unlock_sessions(void) | |
115 | { | |
116 | mutex_unlock(&sessions_mutex); | |
117 | } | |
118 | ||
119 | /* | |
120 | * Called with sessions lock held. | |
121 | */ | |
122 | int lttng_session_active(void) | |
123 | { | |
124 | struct lttng_session *iter; | |
125 | ||
126 | list_for_each_entry(iter, &sessions, list) { | |
127 | if (iter->active) | |
128 | return 1; | |
129 | } | |
130 | return 0; | |
131 | } | |
132 | ||
a90917c3 | 133 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 134 | { |
a90917c3 | 135 | struct lttng_session *session; |
d83004aa | 136 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 137 | int i; |
4e3c1b9b MD |
138 | |
139 | mutex_lock(&sessions_mutex); | |
fd0cebd8 | 140 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 141 | if (!session) |
d83004aa | 142 | goto err; |
4e3c1b9b | 143 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 144 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 145 | uuid_le_gen(&session->uuid); |
d83004aa JD |
146 | |
147 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
148 | GFP_KERNEL); | |
149 | if (!metadata_cache) | |
150 | goto err_free_session; | |
f6da044f | 151 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
152 | if (!metadata_cache->data) |
153 | goto err_free_cache; | |
154 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
155 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 156 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
157 | session->metadata_cache = metadata_cache; |
158 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
159 | memcpy(&metadata_cache->uuid, &session->uuid, |
160 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
161 | INIT_LIST_HEAD(&session->enablers_head); |
162 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
163 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
164 | list_add(&session->list, &sessions); |
165 | mutex_unlock(&sessions_mutex); | |
166 | return session; | |
d83004aa JD |
167 | |
168 | err_free_cache: | |
169 | kfree(metadata_cache); | |
170 | err_free_session: | |
fd0cebd8 | 171 | lttng_kvfree(session); |
d83004aa JD |
172 | err: |
173 | mutex_unlock(&sessions_mutex); | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | void metadata_cache_destroy(struct kref *kref) | |
178 | { | |
179 | struct lttng_metadata_cache *cache = | |
180 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 181 | vfree(cache->data); |
d83004aa | 182 | kfree(cache); |
4e3c1b9b MD |
183 | } |
184 | ||
a90917c3 | 185 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 186 | { |
a90917c3 MD |
187 | struct lttng_channel *chan, *tmpchan; |
188 | struct lttng_event *event, *tmpevent; | |
d83004aa | 189 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 190 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 191 | int ret; |
4e3c1b9b MD |
192 | |
193 | mutex_lock(&sessions_mutex); | |
acb98454 | 194 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
195 | list_for_each_entry(chan, &session->chan, list) { |
196 | ret = lttng_syscalls_unregister(chan); | |
197 | WARN_ON(ret); | |
198 | } | |
dda6a249 | 199 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 200 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
201 | WARN_ON(ret); |
202 | } | |
abcca994 | 203 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
204 | list_for_each_entry_safe(enabler, tmpenabler, |
205 | &session->enablers_head, node) | |
206 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 207 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 208 | _lttng_event_destroy(event); |
d83004aa JD |
209 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
210 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 211 | _lttng_channel_destroy(chan); |
d83004aa JD |
212 | } |
213 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
214 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
215 | if (session->pid_tracker) |
216 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 217 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
218 | list_del(&session->list); |
219 | mutex_unlock(&sessions_mutex); | |
fd0cebd8 | 220 | lttng_kvfree(session); |
4e3c1b9b MD |
221 | } |
222 | ||
601252cf MD |
223 | int lttng_session_statedump(struct lttng_session *session) |
224 | { | |
225 | int ret; | |
226 | ||
227 | mutex_lock(&sessions_mutex); | |
228 | ret = lttng_statedump_start(session); | |
229 | mutex_unlock(&sessions_mutex); | |
230 | return ret; | |
231 | } | |
232 | ||
a90917c3 | 233 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
234 | { |
235 | int ret = 0; | |
a90917c3 | 236 | struct lttng_channel *chan; |
c0e31d2e MD |
237 | |
238 | mutex_lock(&sessions_mutex); | |
239 | if (session->active) { | |
240 | ret = -EBUSY; | |
241 | goto end; | |
242 | } | |
c099397a | 243 | |
3c997079 MD |
244 | /* Set transient enabler state to "enabled" */ |
245 | session->tstate = 1; | |
246 | ||
c099397a MD |
247 | /* |
248 | * Snapshot the number of events per channel to know the type of header | |
249 | * we need to use. | |
250 | */ | |
251 | list_for_each_entry(chan, &session->chan, list) { | |
252 | if (chan->header_type) | |
253 | continue; /* don't change it if session stop/restart */ | |
254 | if (chan->free_event_id < 31) | |
255 | chan->header_type = 1; /* compact */ | |
256 | else | |
257 | chan->header_type = 2; /* large */ | |
258 | } | |
259 | ||
3c997079 MD |
260 | /* We need to sync enablers with session before activation. */ |
261 | lttng_session_sync_enablers(session); | |
262 | ||
64af2437 | 263 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
264 | list_for_each_entry(chan, &session->chan, list) { |
265 | if (chan->channel_type != METADATA_CHANNEL) | |
266 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
267 | } | |
64af2437 | 268 | |
acb98454 MJ |
269 | WRITE_ONCE(session->active, 1); |
270 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 271 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 272 | if (ret) { |
acb98454 | 273 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
274 | goto end; |
275 | } | |
276 | ret = lttng_statedump_start(session); | |
360f38ea | 277 | if (ret) |
acb98454 | 278 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
279 | end: |
280 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 281 | return ret; |
c0e31d2e MD |
282 | } |
283 | ||
a90917c3 | 284 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
285 | { |
286 | int ret = 0; | |
64af2437 | 287 | struct lttng_channel *chan; |
c0e31d2e MD |
288 | |
289 | mutex_lock(&sessions_mutex); | |
290 | if (!session->active) { | |
291 | ret = -EBUSY; | |
292 | goto end; | |
293 | } | |
acb98454 | 294 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
295 | |
296 | /* Set transient enabler state to "disabled" */ | |
297 | session->tstate = 0; | |
298 | lttng_session_sync_enablers(session); | |
64af2437 MD |
299 | |
300 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
301 | list_for_each_entry(chan, &session->chan, list) { |
302 | if (chan->channel_type != METADATA_CHANNEL) | |
303 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
304 | } | |
c0e31d2e MD |
305 | end: |
306 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 307 | return ret; |
c0e31d2e MD |
308 | } |
309 | ||
9616f0bf JD |
310 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
311 | { | |
312 | int ret = 0; | |
313 | struct lttng_channel *chan; | |
314 | struct lttng_event *event; | |
315 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
316 | struct lttng_metadata_stream *stream; | |
317 | ||
318 | mutex_lock(&sessions_mutex); | |
319 | if (!session->active) { | |
320 | ret = -EBUSY; | |
321 | goto end; | |
322 | } | |
323 | ||
324 | mutex_lock(&cache->lock); | |
325 | memset(cache->data, 0, cache->cache_alloc); | |
326 | cache->metadata_written = 0; | |
327 | cache->version++; | |
328 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
329 | stream->metadata_out = 0; | |
330 | stream->metadata_in = 0; | |
331 | } | |
332 | mutex_unlock(&cache->lock); | |
333 | ||
334 | session->metadata_dumped = 0; | |
335 | list_for_each_entry(chan, &session->chan, list) { | |
336 | chan->metadata_dumped = 0; | |
337 | } | |
338 | ||
339 | list_for_each_entry(event, &session->events, list) { | |
340 | event->metadata_dumped = 0; | |
341 | } | |
342 | ||
343 | ret = _lttng_session_metadata_statedump(session); | |
344 | ||
345 | end: | |
346 | mutex_unlock(&sessions_mutex); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | ||
351 | ||
a90917c3 | 352 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 353 | { |
3c997079 | 354 | int ret = 0; |
e64957da | 355 | |
3c997079 MD |
356 | mutex_lock(&sessions_mutex); |
357 | if (channel->channel_type == METADATA_CHANNEL) { | |
358 | ret = -EPERM; | |
359 | goto end; | |
360 | } | |
361 | if (channel->enabled) { | |
362 | ret = -EEXIST; | |
363 | goto end; | |
364 | } | |
365 | /* Set transient enabler state to "enabled" */ | |
366 | channel->tstate = 1; | |
367 | lttng_session_sync_enablers(channel->session); | |
368 | /* Set atomically the state to "enabled" */ | |
acb98454 | 369 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
370 | end: |
371 | mutex_unlock(&sessions_mutex); | |
372 | return ret; | |
e64957da MD |
373 | } |
374 | ||
a90917c3 | 375 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 376 | { |
3c997079 | 377 | int ret = 0; |
e64957da | 378 | |
3c997079 MD |
379 | mutex_lock(&sessions_mutex); |
380 | if (channel->channel_type == METADATA_CHANNEL) { | |
381 | ret = -EPERM; | |
382 | goto end; | |
383 | } | |
384 | if (!channel->enabled) { | |
385 | ret = -EEXIST; | |
386 | goto end; | |
387 | } | |
388 | /* Set atomically the state to "disabled" */ | |
acb98454 | 389 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
390 | /* Set transient enabler state to "enabled" */ |
391 | channel->tstate = 0; | |
392 | lttng_session_sync_enablers(channel->session); | |
393 | end: | |
394 | mutex_unlock(&sessions_mutex); | |
395 | return ret; | |
e64957da MD |
396 | } |
397 | ||
a90917c3 | 398 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 399 | { |
3c997079 | 400 | int ret = 0; |
e64957da | 401 | |
3c997079 MD |
402 | mutex_lock(&sessions_mutex); |
403 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
404 | ret = -EPERM; | |
405 | goto end; | |
406 | } | |
407 | if (event->enabled) { | |
408 | ret = -EEXIST; | |
409 | goto end; | |
410 | } | |
a0493bef MD |
411 | switch (event->instrumentation) { |
412 | case LTTNG_KERNEL_TRACEPOINT: | |
413 | case LTTNG_KERNEL_SYSCALL: | |
414 | ret = -EINVAL; | |
415 | break; | |
416 | case LTTNG_KERNEL_KPROBE: | |
417 | case LTTNG_KERNEL_FUNCTION: | |
418 | case LTTNG_KERNEL_NOOP: | |
acb98454 | 419 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
420 | break; |
421 | case LTTNG_KERNEL_KRETPROBE: | |
422 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
423 | break; | |
424 | default: | |
425 | WARN_ON_ONCE(1); | |
426 | ret = -EINVAL; | |
427 | } | |
3c997079 MD |
428 | end: |
429 | mutex_unlock(&sessions_mutex); | |
430 | return ret; | |
e64957da MD |
431 | } |
432 | ||
a90917c3 | 433 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 434 | { |
3c997079 | 435 | int ret = 0; |
e64957da | 436 | |
3c997079 MD |
437 | mutex_lock(&sessions_mutex); |
438 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
439 | ret = -EPERM; | |
440 | goto end; | |
441 | } | |
442 | if (!event->enabled) { | |
443 | ret = -EEXIST; | |
444 | goto end; | |
445 | } | |
a0493bef MD |
446 | switch (event->instrumentation) { |
447 | case LTTNG_KERNEL_TRACEPOINT: | |
448 | case LTTNG_KERNEL_SYSCALL: | |
449 | ret = -EINVAL; | |
450 | break; | |
451 | case LTTNG_KERNEL_KPROBE: | |
452 | case LTTNG_KERNEL_FUNCTION: | |
453 | case LTTNG_KERNEL_NOOP: | |
acb98454 | 454 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
455 | break; |
456 | case LTTNG_KERNEL_KRETPROBE: | |
457 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
458 | break; | |
459 | default: | |
460 | WARN_ON_ONCE(1); | |
461 | ret = -EINVAL; | |
462 | } | |
3c997079 MD |
463 | end: |
464 | mutex_unlock(&sessions_mutex); | |
465 | return ret; | |
e64957da MD |
466 | } |
467 | ||
a90917c3 | 468 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 469 | { |
a90917c3 | 470 | struct lttng_transport *transport; |
f3d01b96 | 471 | |
a90917c3 | 472 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
473 | if (!strcmp(transport->name, name)) |
474 | return transport; | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
a90917c3 | 479 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
480 | const char *transport_name, |
481 | void *buf_addr, | |
4e3c1b9b MD |
482 | size_t subbuf_size, size_t num_subbuf, |
483 | unsigned int switch_timer_interval, | |
d83004aa JD |
484 | unsigned int read_timer_interval, |
485 | enum channel_type channel_type) | |
4e3c1b9b | 486 | { |
a90917c3 MD |
487 | struct lttng_channel *chan; |
488 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
489 | |
490 | mutex_lock(&sessions_mutex); | |
d83004aa | 491 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 492 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 493 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
494 | if (!transport) { |
495 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
496 | transport_name); | |
c0e31d2e | 497 | goto notransport; |
f3d01b96 | 498 | } |
a33c9927 MD |
499 | if (!try_module_get(transport->owner)) { |
500 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
501 | goto notransport; | |
502 | } | |
a90917c3 | 503 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 504 | if (!chan) |
c0e31d2e | 505 | goto nomem; |
4e3c1b9b | 506 | chan->session = session; |
05d32c64 | 507 | chan->id = session->free_chan_id++; |
3b731ab1 | 508 | chan->ops = &transport->ops; |
125b4df4 MD |
509 | /* |
510 | * Note: the channel creation op already writes into the packet | |
511 | * headers. Therefore the "chan" information used as input | |
512 | * should be already accessible. | |
513 | */ | |
5f5ddf01 MD |
514 | chan->chan = transport->ops.channel_create(transport_name, |
515 | chan, buf_addr, subbuf_size, num_subbuf, | |
516 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
517 | if (!chan->chan) |
518 | goto create_error; | |
3c997079 | 519 | chan->tstate = 1; |
e64957da | 520 | chan->enabled = 1; |
a33c9927 | 521 | chan->transport = transport; |
d83004aa | 522 | chan->channel_type = channel_type; |
4e3c1b9b MD |
523 | list_add(&chan->list, &session->chan); |
524 | mutex_unlock(&sessions_mutex); | |
525 | return chan; | |
526 | ||
f3d01b96 MD |
527 | create_error: |
528 | kfree(chan); | |
c0e31d2e | 529 | nomem: |
a33c9927 MD |
530 | if (transport) |
531 | module_put(transport->owner); | |
c0e31d2e | 532 | notransport: |
e5382b6d | 533 | active: |
4e3c1b9b MD |
534 | mutex_unlock(&sessions_mutex); |
535 | return NULL; | |
536 | } | |
537 | ||
538 | /* | |
d83004aa JD |
539 | * Only used internally at session destruction for per-cpu channels, and |
540 | * when metadata channel is released. | |
541 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 542 | */ |
aa7c23a9 | 543 | static |
a90917c3 | 544 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 545 | { |
11b5a3c2 | 546 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 547 | module_put(chan->transport->owner); |
4e3c1b9b | 548 | list_del(&chan->list); |
8070f5c0 | 549 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
550 | kfree(chan); |
551 | } | |
552 | ||
d83004aa JD |
553 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
554 | { | |
555 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
556 | ||
557 | /* Protect the metadata cache with the sessions_mutex. */ | |
558 | mutex_lock(&sessions_mutex); | |
559 | _lttng_channel_destroy(chan); | |
560 | mutex_unlock(&sessions_mutex); | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
563 | ||
564 | static | |
565 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
566 | { | |
567 | stream->finalized = 1; | |
568 | wake_up_interruptible(&stream->read_wait); | |
569 | } | |
570 | ||
e5382b6d MD |
571 | /* |
572 | * Supports event creation while tracing session is active. | |
3c997079 | 573 | * Needs to be called with sessions mutex held. |
e5382b6d | 574 | */ |
3c997079 MD |
575 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
576 | struct lttng_kernel_event *event_param, | |
577 | void *filter, | |
578 | const struct lttng_event_desc *event_desc, | |
579 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 580 | { |
3c997079 | 581 | struct lttng_session *session = chan->session; |
a90917c3 | 582 | struct lttng_event *event; |
3c997079 MD |
583 | const char *event_name; |
584 | struct hlist_head *head; | |
585 | size_t name_len; | |
586 | uint32_t hash; | |
3d084699 | 587 | int ret; |
4e3c1b9b | 588 | |
abc0446a | 589 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 590 | ret = -EMFILE; |
e5382b6d | 591 | goto full; |
abc0446a | 592 | } |
3c997079 MD |
593 | |
594 | switch (itype) { | |
595 | case LTTNG_KERNEL_TRACEPOINT: | |
596 | event_name = event_desc->name; | |
597 | break; | |
598 | case LTTNG_KERNEL_KPROBE: | |
599 | case LTTNG_KERNEL_KRETPROBE: | |
600 | case LTTNG_KERNEL_FUNCTION: | |
601 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 602 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
603 | event_name = event_param->name; |
604 | break; | |
605 | default: | |
606 | WARN_ON_ONCE(1); | |
607 | ret = -EINVAL; | |
608 | goto type_error; | |
609 | } | |
610 | name_len = strlen(event_name); | |
611 | hash = jhash(event_name, name_len, 0); | |
612 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 613 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
614 | WARN_ON_ONCE(!event->desc); |
615 | if (!strncmp(event->desc->name, event_name, | |
616 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
617 | && chan == event->chan) { | |
618 | ret = -EEXIST; | |
619 | goto exist; | |
abc0446a MD |
620 | } |
621 | } | |
3c997079 | 622 | |
11b5a3c2 | 623 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 624 | if (!event) { |
4cf0bf51 | 625 | ret = -ENOMEM; |
4e3c1b9b | 626 | goto cache_error; |
abc0446a | 627 | } |
4e3c1b9b MD |
628 | event->chan = chan; |
629 | event->filter = filter; | |
e5382b6d | 630 | event->id = chan->free_event_id++; |
3c997079 MD |
631 | event->instrumentation = itype; |
632 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 633 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
634 | INIT_LIST_HEAD(&event->enablers_ref_head); |
635 | ||
636 | switch (itype) { | |
ab2277d6 | 637 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
638 | /* Event will be enabled by enabler sync. */ |
639 | event->enabled = 0; | |
640 | event->registered = 0; | |
641 | event->desc = lttng_event_get(event_name); | |
abc0446a | 642 | if (!event->desc) { |
4cf0bf51 | 643 | ret = -ENOENT; |
d3dbe23c | 644 | goto register_error; |
abc0446a | 645 | } |
3c997079 MD |
646 | /* Populate lttng_event structure before event registration. */ |
647 | smp_wmb(); | |
baf20995 | 648 | break; |
ab2277d6 | 649 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
650 | /* |
651 | * Needs to be explicitly enabled after creation, since | |
652 | * we may want to apply filters. | |
653 | */ | |
654 | event->enabled = 0; | |
3c997079 MD |
655 | event->registered = 1; |
656 | /* | |
657 | * Populate lttng_event structure before event | |
658 | * registration. | |
659 | */ | |
660 | smp_wmb(); | |
661 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
662 | event_param->u.kprobe.symbol_name, |
663 | event_param->u.kprobe.offset, | |
664 | event_param->u.kprobe.addr, | |
665 | event); | |
abc0446a | 666 | if (ret) { |
4cf0bf51 | 667 | ret = -EINVAL; |
d6d808f3 | 668 | goto register_error; |
abc0446a | 669 | } |
edeb3137 MD |
670 | ret = try_module_get(event->desc->owner); |
671 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 672 | break; |
7371f44c MD |
673 | case LTTNG_KERNEL_KRETPROBE: |
674 | { | |
a90917c3 | 675 | struct lttng_event *event_return; |
7371f44c MD |
676 | |
677 | /* kretprobe defines 2 events */ | |
a0493bef MD |
678 | /* |
679 | * Needs to be explicitly enabled after creation, since | |
680 | * we may want to apply filters. | |
681 | */ | |
682 | event->enabled = 0; | |
3c997079 | 683 | event->registered = 1; |
7371f44c MD |
684 | event_return = |
685 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 686 | if (!event_return) { |
4cf0bf51 | 687 | ret = -ENOMEM; |
7371f44c | 688 | goto register_error; |
abc0446a | 689 | } |
7371f44c MD |
690 | event_return->chan = chan; |
691 | event_return->filter = filter; | |
692 | event_return->id = chan->free_event_id++; | |
a0493bef | 693 | event_return->enabled = 0; |
3c997079 MD |
694 | event_return->registered = 1; |
695 | event_return->instrumentation = itype; | |
7371f44c | 696 | /* |
a90917c3 | 697 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
698 | */ |
699 | smp_wmb(); | |
3c997079 | 700 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
701 | event_param->u.kretprobe.symbol_name, |
702 | event_param->u.kretprobe.offset, | |
703 | event_param->u.kretprobe.addr, | |
704 | event, event_return); | |
705 | if (ret) { | |
706 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 707 | ret = -EINVAL; |
7371f44c MD |
708 | goto register_error; |
709 | } | |
710 | /* Take 2 refs on the module: one per event. */ | |
711 | ret = try_module_get(event->desc->owner); | |
712 | WARN_ON_ONCE(!ret); | |
713 | ret = try_module_get(event->desc->owner); | |
714 | WARN_ON_ONCE(!ret); | |
a90917c3 | 715 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 716 | event_return); |
abc0446a | 717 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
718 | if (ret) { |
719 | kmem_cache_free(event_cache, event_return); | |
720 | module_put(event->desc->owner); | |
721 | module_put(event->desc->owner); | |
722 | goto statedump_error; | |
723 | } | |
724 | list_add(&event_return->list, &chan->session->events); | |
725 | break; | |
726 | } | |
ab2277d6 | 727 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
728 | /* |
729 | * Needs to be explicitly enabled after creation, since | |
730 | * we may want to apply filters. | |
731 | */ | |
732 | event->enabled = 0; | |
3c997079 MD |
733 | event->registered = 1; |
734 | /* | |
735 | * Populate lttng_event structure before event | |
736 | * registration. | |
737 | */ | |
738 | smp_wmb(); | |
739 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
740 | event_param->u.ftrace.symbol_name, |
741 | event); | |
abc0446a | 742 | if (ret) { |
e0a7a7c4 | 743 | goto register_error; |
abc0446a | 744 | } |
edeb3137 MD |
745 | ret = try_module_get(event->desc->owner); |
746 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 747 | break; |
1ec65de1 | 748 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 749 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
750 | /* |
751 | * Needs to be explicitly enabled after creation, since | |
752 | * we may want to apply filters. | |
753 | */ | |
754 | event->enabled = 0; | |
3c997079 MD |
755 | event->registered = 0; |
756 | event->desc = event_desc; | |
abc0446a | 757 | if (!event->desc) { |
4cf0bf51 | 758 | ret = -EINVAL; |
259b6cb3 | 759 | goto register_error; |
abc0446a | 760 | } |
1ec65de1 | 761 | break; |
baf20995 MD |
762 | default: |
763 | WARN_ON_ONCE(1); | |
4cf0bf51 | 764 | ret = -EINVAL; |
df07930b | 765 | goto register_error; |
baf20995 | 766 | } |
a90917c3 | 767 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
768 | WARN_ON_ONCE(ret > 0); |
769 | if (ret) { | |
c099397a | 770 | goto statedump_error; |
abc0446a | 771 | } |
3c997079 | 772 | hlist_add_head(&event->hlist, head); |
dda6a249 | 773 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
774 | return event; |
775 | ||
c099397a | 776 | statedump_error: |
259b6cb3 | 777 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 778 | register_error: |
11b5a3c2 | 779 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
780 | cache_error: |
781 | exist: | |
3c997079 | 782 | type_error: |
e5382b6d | 783 | full: |
4cf0bf51 | 784 | return ERR_PTR(ret); |
4e3c1b9b MD |
785 | } |
786 | ||
3c997079 MD |
787 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
788 | struct lttng_kernel_event *event_param, | |
789 | void *filter, | |
790 | const struct lttng_event_desc *event_desc, | |
791 | enum lttng_kernel_instrumentation itype) | |
792 | { | |
793 | struct lttng_event *event; | |
794 | ||
795 | mutex_lock(&sessions_mutex); | |
796 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
797 | itype); | |
798 | mutex_unlock(&sessions_mutex); | |
799 | return event; | |
800 | } | |
801 | ||
802 | /* Only used for tracepoints for now. */ | |
803 | static | |
804 | void register_event(struct lttng_event *event) | |
805 | { | |
806 | const struct lttng_event_desc *desc; | |
f127e61e | 807 | int ret = -EINVAL; |
3c997079 | 808 | |
3c997079 MD |
809 | if (event->registered) |
810 | return; | |
4ecb5ad5 | 811 | |
3c997079 | 812 | desc = event->desc; |
4ecb5ad5 MD |
813 | switch (event->instrumentation) { |
814 | case LTTNG_KERNEL_TRACEPOINT: | |
815 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
816 | desc->probe_callback, | |
817 | event); | |
818 | break; | |
819 | case LTTNG_KERNEL_SYSCALL: | |
820 | ret = lttng_syscall_filter_enable(event->chan, | |
821 | desc->name); | |
822 | break; | |
823 | case LTTNG_KERNEL_KPROBE: | |
824 | case LTTNG_KERNEL_KRETPROBE: | |
825 | case LTTNG_KERNEL_FUNCTION: | |
826 | case LTTNG_KERNEL_NOOP: | |
827 | ret = 0; | |
828 | break; | |
829 | default: | |
830 | WARN_ON_ONCE(1); | |
831 | } | |
3c997079 MD |
832 | if (!ret) |
833 | event->registered = 1; | |
834 | } | |
835 | ||
4e3c1b9b MD |
836 | /* |
837 | * Only used internally at session destruction. | |
838 | */ | |
a90917c3 | 839 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 840 | { |
4ecb5ad5 | 841 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
842 | int ret = -EINVAL; |
843 | ||
3c997079 MD |
844 | if (!event->registered) |
845 | return 0; | |
846 | ||
4ecb5ad5 | 847 | desc = event->desc; |
38d024ae | 848 | switch (event->instrumentation) { |
ab2277d6 | 849 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 850 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 851 | event->desc->probe_callback, |
11b5a3c2 | 852 | event); |
baf20995 | 853 | break; |
ab2277d6 | 854 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 855 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
856 | ret = 0; |
857 | break; | |
7371f44c MD |
858 | case LTTNG_KERNEL_KRETPROBE: |
859 | lttng_kretprobes_unregister(event); | |
860 | ret = 0; | |
861 | break; | |
ab2277d6 | 862 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
863 | lttng_ftrace_unregister(event); |
864 | ret = 0; | |
865 | break; | |
33a39a3c | 866 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
867 | ret = lttng_syscall_filter_disable(event->chan, |
868 | desc->name); | |
869 | break; | |
870 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
871 | ret = 0; |
872 | break; | |
baf20995 MD |
873 | default: |
874 | WARN_ON_ONCE(1); | |
875 | } | |
3c997079 MD |
876 | if (!ret) |
877 | event->registered = 0; | |
dda6a249 MD |
878 | return ret; |
879 | } | |
880 | ||
881 | /* | |
882 | * Only used internally at session destruction. | |
883 | */ | |
be066e6c | 884 | static |
a90917c3 | 885 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 886 | { |
edeb3137 MD |
887 | switch (event->instrumentation) { |
888 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 889 | lttng_event_put(event->desc); |
edeb3137 MD |
890 | break; |
891 | case LTTNG_KERNEL_KPROBE: | |
892 | module_put(event->desc->owner); | |
893 | lttng_kprobes_destroy_private(event); | |
894 | break; | |
7371f44c MD |
895 | case LTTNG_KERNEL_KRETPROBE: |
896 | module_put(event->desc->owner); | |
897 | lttng_kretprobes_destroy_private(event); | |
898 | break; | |
edeb3137 MD |
899 | case LTTNG_KERNEL_FUNCTION: |
900 | module_put(event->desc->owner); | |
901 | lttng_ftrace_destroy_private(event); | |
902 | break; | |
259b6cb3 | 903 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 904 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 905 | break; |
edeb3137 MD |
906 | default: |
907 | WARN_ON_ONCE(1); | |
908 | } | |
dda6a249 | 909 | list_del(&event->list); |
8070f5c0 | 910 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 911 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
912 | } |
913 | ||
e0130fab MD |
914 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
915 | { | |
916 | int ret; | |
917 | ||
918 | if (pid < -1) | |
919 | return -EINVAL; | |
920 | mutex_lock(&sessions_mutex); | |
921 | if (pid == -1) { | |
922 | /* track all pids: destroy tracker. */ | |
923 | if (session->pid_tracker) { | |
924 | struct lttng_pid_tracker *lpf; | |
925 | ||
926 | lpf = session->pid_tracker; | |
927 | rcu_assign_pointer(session->pid_tracker, NULL); | |
928 | synchronize_trace(); | |
929 | lttng_pid_tracker_destroy(lpf); | |
930 | } | |
931 | ret = 0; | |
932 | } else { | |
933 | if (!session->pid_tracker) { | |
934 | struct lttng_pid_tracker *lpf; | |
935 | ||
936 | lpf = lttng_pid_tracker_create(); | |
937 | if (!lpf) { | |
938 | ret = -ENOMEM; | |
939 | goto unlock; | |
940 | } | |
941 | ret = lttng_pid_tracker_add(lpf, pid); | |
942 | rcu_assign_pointer(session->pid_tracker, lpf); | |
943 | } else { | |
944 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
945 | } | |
946 | } | |
947 | unlock: | |
948 | mutex_unlock(&sessions_mutex); | |
949 | return ret; | |
950 | } | |
951 | ||
952 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
953 | { | |
954 | int ret; | |
955 | ||
956 | if (pid < -1) | |
957 | return -EINVAL; | |
958 | mutex_lock(&sessions_mutex); | |
959 | if (pid == -1) { | |
960 | /* untrack all pids: replace by empty tracker. */ | |
961 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
962 | struct lttng_pid_tracker *lpf; | |
963 | ||
964 | lpf = lttng_pid_tracker_create(); | |
965 | if (!lpf) { | |
966 | ret = -ENOMEM; | |
967 | goto unlock; | |
968 | } | |
969 | rcu_assign_pointer(session->pid_tracker, lpf); | |
970 | synchronize_trace(); | |
971 | if (old_lpf) | |
972 | lttng_pid_tracker_destroy(old_lpf); | |
973 | ret = 0; | |
974 | } else { | |
975 | if (!session->pid_tracker) { | |
976 | ret = -ENOENT; | |
977 | goto unlock; | |
978 | } | |
979 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
980 | } | |
981 | unlock: | |
982 | mutex_unlock(&sessions_mutex); | |
983 | return ret; | |
984 | } | |
985 | ||
7e6f9ef6 MD |
986 | static |
987 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
988 | { | |
989 | struct lttng_session *session = m->private; | |
990 | struct lttng_pid_tracker *lpf; | |
991 | struct lttng_pid_hash_node *e; | |
992 | int iter = 0, i; | |
993 | ||
994 | mutex_lock(&sessions_mutex); | |
995 | lpf = session->pid_tracker; | |
996 | if (lpf) { | |
997 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
998 | struct hlist_head *head = &lpf->pid_hash[i]; | |
999 | ||
f934e302 | 1000 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1001 | if (iter++ >= *pos) |
1002 | return e; | |
1003 | } | |
1004 | } | |
1005 | } else { | |
1006 | /* PID tracker disabled. */ | |
1007 | if (iter >= *pos && iter == 0) { | |
1008 | return session; /* empty tracker */ | |
1009 | } | |
1010 | iter++; | |
1011 | } | |
1012 | /* End of list */ | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
1016 | /* Called with sessions_mutex held. */ | |
1017 | static | |
1018 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1019 | { | |
1020 | struct lttng_session *session = m->private; | |
1021 | struct lttng_pid_tracker *lpf; | |
1022 | struct lttng_pid_hash_node *e; | |
1023 | int iter = 0, i; | |
1024 | ||
1025 | (*ppos)++; | |
1026 | lpf = session->pid_tracker; | |
1027 | if (lpf) { | |
1028 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1029 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1030 | ||
f934e302 | 1031 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1032 | if (iter++ >= *ppos) |
1033 | return e; | |
1034 | } | |
1035 | } | |
1036 | } else { | |
1037 | /* PID tracker disabled. */ | |
1038 | if (iter >= *ppos && iter == 0) | |
1039 | return session; /* empty tracker */ | |
1040 | iter++; | |
1041 | } | |
1042 | ||
1043 | /* End of list */ | |
1044 | return NULL; | |
1045 | } | |
1046 | ||
1047 | static | |
1048 | void pid_list_stop(struct seq_file *m, void *p) | |
1049 | { | |
1050 | mutex_unlock(&sessions_mutex); | |
1051 | } | |
1052 | ||
1053 | static | |
1054 | int pid_list_show(struct seq_file *m, void *p) | |
1055 | { | |
1056 | int pid; | |
1057 | ||
1058 | if (p == m->private) { | |
1059 | /* Tracker disabled. */ | |
1060 | pid = -1; | |
1061 | } else { | |
1062 | const struct lttng_pid_hash_node *e = p; | |
1063 | ||
1064 | pid = lttng_pid_tracker_get_node_pid(e); | |
1065 | } | |
1066 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static | |
1071 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1072 | .start = pid_list_start, | |
1073 | .next = pid_list_next, | |
1074 | .stop = pid_list_stop, | |
1075 | .show = pid_list_show, | |
1076 | }; | |
1077 | ||
1078 | static | |
1079 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1080 | { | |
1081 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1082 | } | |
1083 | ||
1084 | static | |
1085 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1086 | { | |
1087 | struct seq_file *m = file->private_data; | |
1088 | struct lttng_session *session = m->private; | |
1089 | int ret; | |
1090 | ||
1091 | WARN_ON_ONCE(!session); | |
1092 | ret = seq_release(inode, file); | |
1093 | if (!ret && session) | |
1094 | fput(session->file); | |
1095 | return ret; | |
1096 | } | |
1097 | ||
1098 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1099 | .owner = THIS_MODULE, | |
1100 | .open = lttng_tracker_pids_list_open, | |
1101 | .read = seq_read, | |
1102 | .llseek = seq_lseek, | |
1103 | .release = lttng_tracker_pids_list_release, | |
1104 | }; | |
1105 | ||
1106 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1107 | { | |
1108 | struct file *tracker_pids_list_file; | |
1109 | struct seq_file *m; | |
1110 | int file_fd, ret; | |
1111 | ||
1112 | file_fd = lttng_get_unused_fd(); | |
1113 | if (file_fd < 0) { | |
1114 | ret = file_fd; | |
1115 | goto fd_error; | |
1116 | } | |
1117 | ||
1118 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1119 | <tng_tracker_pids_list_fops, | |
1120 | NULL, O_RDWR); | |
1121 | if (IS_ERR(tracker_pids_list_file)) { | |
1122 | ret = PTR_ERR(tracker_pids_list_file); | |
1123 | goto file_error; | |
1124 | } | |
afbee416 MJ |
1125 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1126 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1127 | goto refcount_error; |
1128 | } | |
7e6f9ef6 MD |
1129 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1130 | if (ret < 0) | |
1131 | goto open_error; | |
1132 | m = tracker_pids_list_file->private_data; | |
1133 | m->private = session; | |
1134 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1135 | |
1136 | return file_fd; | |
1137 | ||
1138 | open_error: | |
9c1f4643 MD |
1139 | atomic_long_dec(&session->file->f_count); |
1140 | refcount_error: | |
7e6f9ef6 MD |
1141 | fput(tracker_pids_list_file); |
1142 | file_error: | |
1143 | put_unused_fd(file_fd); | |
1144 | fd_error: | |
1145 | return ret; | |
1146 | } | |
1147 | ||
3c997079 MD |
1148 | /* |
1149 | * Enabler management. | |
1150 | */ | |
1151 | static | |
4993071a PP |
1152 | int lttng_match_enabler_star_glob(const char *desc_name, |
1153 | const char *pattern) | |
3c997079 | 1154 | { |
cbc19040 MD |
1155 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1156 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1157 | return 0; |
1158 | return 1; | |
1159 | } | |
1160 | ||
1161 | static | |
4ecb5ad5 MD |
1162 | int lttng_match_enabler_name(const char *desc_name, |
1163 | const char *name) | |
3c997079 | 1164 | { |
4ecb5ad5 | 1165 | if (strcmp(desc_name, name)) |
3c997079 MD |
1166 | return 0; |
1167 | return 1; | |
1168 | } | |
1169 | ||
1170 | static | |
1171 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1172 | struct lttng_enabler *enabler) | |
1173 | { | |
4ecb5ad5 MD |
1174 | const char *desc_name, *enabler_name; |
1175 | ||
1176 | enabler_name = enabler->event_param.name; | |
1177 | switch (enabler->event_param.instrumentation) { | |
1178 | case LTTNG_KERNEL_TRACEPOINT: | |
1179 | desc_name = desc->name; | |
1180 | break; | |
1181 | case LTTNG_KERNEL_SYSCALL: | |
1182 | desc_name = desc->name; | |
1183 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1184 | desc_name += strlen("compat_"); | |
1185 | if (!strncmp(desc_name, "syscall_exit_", | |
1186 | strlen("syscall_exit_"))) { | |
1187 | desc_name += strlen("syscall_exit_"); | |
1188 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1189 | strlen("syscall_entry_"))) { | |
1190 | desc_name += strlen("syscall_entry_"); | |
1191 | } else { | |
1192 | WARN_ON_ONCE(1); | |
1193 | return -EINVAL; | |
1194 | } | |
1195 | break; | |
1196 | default: | |
1197 | WARN_ON_ONCE(1); | |
1198 | return -EINVAL; | |
1199 | } | |
3c997079 | 1200 | switch (enabler->type) { |
4993071a PP |
1201 | case LTTNG_ENABLER_STAR_GLOB: |
1202 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1203 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1204 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1205 | default: |
1206 | return -EINVAL; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | static | |
1211 | int lttng_event_match_enabler(struct lttng_event *event, | |
1212 | struct lttng_enabler *enabler) | |
1213 | { | |
33a39a3c MD |
1214 | if (enabler->event_param.instrumentation != event->instrumentation) |
1215 | return 0; | |
3c997079 MD |
1216 | if (lttng_desc_match_enabler(event->desc, enabler) |
1217 | && event->chan == enabler->chan) | |
1218 | return 1; | |
1219 | else | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static | |
1224 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1225 | struct lttng_enabler *enabler) | |
1226 | { | |
1227 | struct lttng_enabler_ref *enabler_ref; | |
1228 | ||
1229 | list_for_each_entry(enabler_ref, | |
1230 | &event->enablers_ref_head, node) { | |
1231 | if (enabler_ref->ref == enabler) | |
1232 | return enabler_ref; | |
1233 | } | |
1234 | return NULL; | |
1235 | } | |
1236 | ||
3c997079 | 1237 | static |
33a39a3c | 1238 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1239 | { |
1240 | struct lttng_session *session = enabler->chan->session; | |
1241 | struct lttng_probe_desc *probe_desc; | |
1242 | const struct lttng_event_desc *desc; | |
1243 | int i; | |
1244 | struct list_head *probe_list; | |
1245 | ||
1246 | probe_list = lttng_get_probe_list_head(); | |
1247 | /* | |
1248 | * For each probe event, if we find that a probe event matches | |
1249 | * our enabler, create an associated lttng_event if not | |
1250 | * already present. | |
1251 | */ | |
1252 | list_for_each_entry(probe_desc, probe_list, head) { | |
1253 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1254 | int found = 0; | |
1255 | struct hlist_head *head; | |
1256 | const char *event_name; | |
1257 | size_t name_len; | |
1258 | uint32_t hash; | |
1259 | struct lttng_event *event; | |
1260 | ||
1261 | desc = probe_desc->event_desc[i]; | |
1262 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1263 | continue; | |
1264 | event_name = desc->name; | |
1265 | name_len = strlen(event_name); | |
1266 | ||
1267 | /* | |
1268 | * Check if already created. | |
1269 | */ | |
1270 | hash = jhash(event_name, name_len, 0); | |
1271 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1272 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1273 | if (event->desc == desc |
1274 | && event->chan == enabler->chan) | |
1275 | found = 1; | |
1276 | } | |
1277 | if (found) | |
1278 | continue; | |
1279 | ||
1280 | /* | |
1281 | * We need to create an event for this | |
1282 | * event probe. | |
1283 | */ | |
1284 | event = _lttng_event_create(enabler->chan, | |
1285 | NULL, NULL, desc, | |
1286 | LTTNG_KERNEL_TRACEPOINT); | |
1287 | if (!event) { | |
1288 | printk(KERN_INFO "Unable to create event %s\n", | |
1289 | probe_desc->event_desc[i]->name); | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | } | |
1294 | ||
33a39a3c MD |
1295 | static |
1296 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1297 | { | |
1298 | int ret; | |
1299 | ||
1300 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1301 | WARN_ON_ONCE(ret); | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Create struct lttng_event if it is missing and present in the list of | |
1306 | * tracepoint probes. | |
1307 | * Should be called with sessions mutex held. | |
1308 | */ | |
1309 | static | |
1310 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1311 | { | |
1312 | switch (enabler->event_param.instrumentation) { | |
1313 | case LTTNG_KERNEL_TRACEPOINT: | |
1314 | lttng_create_tracepoint_if_missing(enabler); | |
1315 | break; | |
1316 | case LTTNG_KERNEL_SYSCALL: | |
1317 | lttng_create_syscall_if_missing(enabler); | |
1318 | break; | |
1319 | default: | |
1320 | WARN_ON_ONCE(1); | |
1321 | break; | |
1322 | } | |
1323 | } | |
1324 | ||
3c997079 MD |
1325 | /* |
1326 | * Create events associated with an enabler (if not already present), | |
1327 | * and add backward reference from the event to the enabler. | |
1328 | * Should be called with sessions mutex held. | |
1329 | */ | |
1330 | static | |
1331 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1332 | { | |
1333 | struct lttng_session *session = enabler->chan->session; | |
1334 | struct lttng_event *event; | |
1335 | ||
1336 | /* First ensure that probe events are created for this enabler. */ | |
1337 | lttng_create_event_if_missing(enabler); | |
1338 | ||
1339 | /* For each event matching enabler in session event list. */ | |
1340 | list_for_each_entry(event, &session->events, list) { | |
1341 | struct lttng_enabler_ref *enabler_ref; | |
1342 | ||
1343 | if (!lttng_event_match_enabler(event, enabler)) | |
1344 | continue; | |
1345 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1346 | if (!enabler_ref) { | |
1347 | /* | |
1348 | * If no backward ref, create it. | |
1349 | * Add backward ref from event to enabler. | |
1350 | */ | |
1351 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1352 | if (!enabler_ref) | |
1353 | return -ENOMEM; | |
1354 | enabler_ref->ref = enabler; | |
1355 | list_add(&enabler_ref->node, | |
1356 | &event->enablers_ref_head); | |
1357 | } | |
1358 | ||
f127e61e MD |
1359 | /* |
1360 | * Link filter bytecodes if not linked yet. | |
1361 | */ | |
1362 | lttng_enabler_event_link_bytecode(event, enabler); | |
1363 | ||
3c997079 MD |
1364 | /* TODO: merge event context. */ |
1365 | } | |
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | /* | |
1370 | * Called at module load: connect the probe on all enablers matching | |
1371 | * this event. | |
1372 | * Called with sessions lock held. | |
1373 | */ | |
1374 | int lttng_fix_pending_events(void) | |
1375 | { | |
1376 | struct lttng_session *session; | |
1377 | ||
1378 | list_for_each_entry(session, &sessions, list) | |
1379 | lttng_session_lazy_sync_enablers(session); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1384 | struct lttng_kernel_event *event_param, | |
1385 | struct lttng_channel *chan) | |
1386 | { | |
1387 | struct lttng_enabler *enabler; | |
1388 | ||
1389 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1390 | if (!enabler) | |
1391 | return NULL; | |
1392 | enabler->type = type; | |
07dfc1d0 | 1393 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1394 | memcpy(&enabler->event_param, event_param, |
1395 | sizeof(enabler->event_param)); | |
1396 | enabler->chan = chan; | |
1397 | /* ctx left NULL */ | |
4fd19d8a | 1398 | enabler->enabled = 0; |
3c997079 MD |
1399 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1400 | mutex_lock(&sessions_mutex); | |
1401 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1402 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1403 | mutex_unlock(&sessions_mutex); | |
1404 | return enabler; | |
1405 | } | |
1406 | ||
1407 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1408 | { | |
1409 | mutex_lock(&sessions_mutex); | |
1410 | enabler->enabled = 1; | |
1411 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1412 | mutex_unlock(&sessions_mutex); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1417 | { | |
1418 | mutex_lock(&sessions_mutex); | |
1419 | enabler->enabled = 0; | |
1420 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1421 | mutex_unlock(&sessions_mutex); | |
1422 | return 0; | |
1423 | } | |
1424 | ||
07dfc1d0 MD |
1425 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1426 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1427 | { | |
1428 | struct lttng_filter_bytecode_node *bytecode_node; | |
1429 | uint32_t bytecode_len; | |
1430 | int ret; | |
1431 | ||
1432 | ret = get_user(bytecode_len, &bytecode->len); | |
1433 | if (ret) | |
1434 | return ret; | |
1435 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1436 | GFP_KERNEL); | |
1437 | if (!bytecode_node) | |
1438 | return -ENOMEM; | |
1439 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1440 | sizeof(*bytecode) + bytecode_len); | |
1441 | if (ret) | |
1442 | goto error_free; | |
1443 | bytecode_node->enabler = enabler; | |
1444 | /* Enforce length based on allocated size */ | |
1445 | bytecode_node->bc.len = bytecode_len; | |
1446 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1447 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1448 | return 0; | |
1449 | ||
1450 | error_free: | |
1451 | kfree(bytecode_node); | |
1452 | return ret; | |
1453 | } | |
1454 | ||
3c997079 MD |
1455 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1456 | struct lttng_kernel_context *context_param) | |
1457 | { | |
1458 | return -ENOSYS; | |
1459 | } | |
1460 | ||
1461 | static | |
1462 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1463 | { | |
07dfc1d0 MD |
1464 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1465 | ||
1466 | /* Destroy filter bytecode */ | |
1467 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1468 | &enabler->filter_bytecode_head, node) { | |
1469 | kfree(filter_node); | |
1470 | } | |
1471 | ||
3c997079 MD |
1472 | /* Destroy contexts */ |
1473 | lttng_destroy_context(enabler->ctx); | |
1474 | ||
1475 | list_del(&enabler->node); | |
1476 | kfree(enabler); | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * lttng_session_sync_enablers should be called just before starting a | |
1481 | * session. | |
1482 | * Should be called with sessions mutex held. | |
1483 | */ | |
1484 | static | |
1485 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1486 | { | |
1487 | struct lttng_enabler *enabler; | |
1488 | struct lttng_event *event; | |
1489 | ||
1490 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1491 | lttng_enabler_ref_events(enabler); | |
1492 | /* | |
1493 | * For each event, if at least one of its enablers is enabled, | |
1494 | * and its channel and session transient states are enabled, we | |
1495 | * enable the event, else we disable it. | |
1496 | */ | |
1497 | list_for_each_entry(event, &session->events, list) { | |
1498 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1499 | struct lttng_bytecode_runtime *runtime; |
1500 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1501 | |
4ecb5ad5 MD |
1502 | switch (event->instrumentation) { |
1503 | case LTTNG_KERNEL_TRACEPOINT: | |
1504 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1505 | /* Enable events */ |
1506 | list_for_each_entry(enabler_ref, | |
1507 | &event->enablers_ref_head, node) { | |
1508 | if (enabler_ref->ref->enabled) { | |
1509 | enabled = 1; | |
1510 | break; | |
1511 | } | |
1512 | } | |
4ecb5ad5 MD |
1513 | break; |
1514 | default: | |
3c997079 MD |
1515 | /* Not handled with lazy sync. */ |
1516 | continue; | |
1517 | } | |
1518 | /* | |
1519 | * Enabled state is based on union of enablers, with | |
1520 | * intesection of session and channel transient enable | |
1521 | * states. | |
1522 | */ | |
1523 | enabled = enabled && session->tstate && event->chan->tstate; | |
1524 | ||
acb98454 | 1525 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1526 | /* |
1527 | * Sync tracepoint registration with event enabled | |
1528 | * state. | |
1529 | */ | |
1530 | if (enabled) { | |
1531 | register_event(event); | |
1532 | } else { | |
1533 | _lttng_event_unregister(event); | |
1534 | } | |
07dfc1d0 MD |
1535 | |
1536 | /* Check if has enablers without bytecode enabled */ | |
1537 | list_for_each_entry(enabler_ref, | |
1538 | &event->enablers_ref_head, node) { | |
1539 | if (enabler_ref->ref->enabled | |
1540 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1541 | has_enablers_without_bytecode = 1; | |
1542 | break; | |
1543 | } | |
1544 | } | |
1545 | event->has_enablers_without_bytecode = | |
1546 | has_enablers_without_bytecode; | |
1547 | ||
1548 | /* Enable filters */ | |
1549 | list_for_each_entry(runtime, | |
f127e61e | 1550 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1551 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1552 | } |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Apply enablers to session events, adding events to session if need | |
1557 | * be. It is required after each modification applied to an active | |
1558 | * session, and right before session "start". | |
1559 | * "lazy" sync means we only sync if required. | |
1560 | * Should be called with sessions mutex held. | |
1561 | */ | |
1562 | static | |
1563 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1564 | { | |
1565 | /* We can skip if session is not active */ | |
1566 | if (!session->active) | |
1567 | return; | |
1568 | lttng_session_sync_enablers(session); | |
1569 | } | |
1570 | ||
1ec3f75a | 1571 | /* |
d83004aa JD |
1572 | * Serialize at most one packet worth of metadata into a metadata |
1573 | * channel. | |
92d9f5e6 MD |
1574 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1575 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1576 | * allows us to do racy operations such as looking for remaining space left in | |
1577 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1578 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1579 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1580 | * Returns the number of bytes written in the channel, 0 if no data |
1581 | * was written and a negative value on error. | |
1ec3f75a | 1582 | */ |
b3b8072b MD |
1583 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1584 | struct channel *chan) | |
d83004aa JD |
1585 | { |
1586 | struct lib_ring_buffer_ctx ctx; | |
1587 | int ret = 0; | |
1588 | size_t len, reserve_len; | |
1589 | ||
f613e3e6 | 1590 | /* |
92d9f5e6 MD |
1591 | * Ensure we support mutiple get_next / put sequences followed by |
1592 | * put_next. The metadata cache lock protects reading the metadata | |
1593 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1594 | * "flush" operations on the buffer invoked by different processes. | |
1595 | * Moreover, since the metadata cache memory can be reallocated, we | |
1596 | * need to have exclusive access against updates even though we only | |
1597 | * read it. | |
f613e3e6 | 1598 | */ |
92d9f5e6 | 1599 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1600 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1601 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1602 | goto end; |
f613e3e6 | 1603 | |
9616f0bf JD |
1604 | /* Metadata regenerated, change the version. */ |
1605 | if (stream->metadata_cache->version != stream->version) | |
1606 | stream->version = stream->metadata_cache->version; | |
1607 | ||
d83004aa | 1608 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1609 | stream->metadata_in; |
9de2c215 | 1610 | if (!len) |
de23d59d | 1611 | goto end; |
d83004aa | 1612 | reserve_len = min_t(size_t, |
b3b8072b | 1613 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1614 | len); |
b3b8072b | 1615 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1616 | sizeof(char), -1); |
1617 | /* | |
1618 | * If reservation failed, return an error to the caller. | |
1619 | */ | |
b3b8072b | 1620 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1621 | if (ret != 0) { |
1622 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1623 | goto end; | |
1624 | } | |
b3b8072b | 1625 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1626 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1627 | reserve_len); |
b3b8072b | 1628 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1629 | stream->metadata_in += reserve_len; |
d83004aa JD |
1630 | ret = reserve_len; |
1631 | ||
1632 | end: | |
92d9f5e6 | 1633 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1634 | return ret; |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * Write the metadata to the metadata cache. | |
1639 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1640 | * The metadata cache lock protects us from concurrent read access from |
1641 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1642 | */ |
a90917c3 | 1643 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1644 | const char *fmt, ...) |
1645 | { | |
c099397a | 1646 | char *str; |
d83004aa | 1647 | size_t len; |
c099397a | 1648 | va_list ap; |
d83004aa | 1649 | struct lttng_metadata_stream *stream; |
c099397a | 1650 | |
acb98454 | 1651 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1652 | |
1653 | va_start(ap, fmt); | |
1654 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1655 | va_end(ap); | |
1656 | if (!str) | |
1657 | return -ENOMEM; | |
1658 | ||
1ec3f75a | 1659 | len = strlen(str); |
92d9f5e6 | 1660 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1661 | if (session->metadata_cache->metadata_written + len > |
1662 | session->metadata_cache->cache_alloc) { | |
1663 | char *tmp_cache_realloc; | |
1664 | unsigned int tmp_cache_alloc_size; | |
1665 | ||
1666 | tmp_cache_alloc_size = max_t(unsigned int, | |
1667 | session->metadata_cache->cache_alloc + len, | |
1668 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1669 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1670 | if (!tmp_cache_realloc) |
1671 | goto err; | |
a606b6e8 ML |
1672 | if (session->metadata_cache->data) { |
1673 | memcpy(tmp_cache_realloc, | |
1674 | session->metadata_cache->data, | |
1675 | session->metadata_cache->cache_alloc); | |
1676 | vfree(session->metadata_cache->data); | |
1677 | } | |
1678 | ||
d83004aa JD |
1679 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1680 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1681 | } |
d83004aa JD |
1682 | memcpy(session->metadata_cache->data + |
1683 | session->metadata_cache->metadata_written, | |
1684 | str, len); | |
1685 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1686 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1687 | kfree(str); |
d83004aa JD |
1688 | |
1689 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1690 | wake_up_interruptible(&stream->read_wait); | |
1691 | ||
1692 | return 0; | |
1693 | ||
1694 | err: | |
92d9f5e6 | 1695 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1696 | kfree(str); |
1697 | return -ENOMEM; | |
c099397a MD |
1698 | } |
1699 | ||
f513b2bf MD |
1700 | static |
1701 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1702 | { | |
1703 | size_t i; | |
1704 | ||
1705 | for (i = 0; i < nesting; i++) { | |
1706 | int ret; | |
1707 | ||
1708 | ret = lttng_metadata_printf(session, " "); | |
1709 | if (ret) { | |
1710 | return ret; | |
1711 | } | |
1712 | } | |
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | /* | |
1717 | * Must be called with sessions_mutex held. | |
1718 | */ | |
1719 | static | |
1720 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1721 | const struct lttng_type *type, | |
1722 | size_t nesting) | |
1723 | { | |
1724 | int ret; | |
1725 | uint32_t i, nr_fields; | |
1726 | ||
1727 | ret = print_tabs(session, nesting); | |
1728 | if (ret) | |
1729 | return ret; | |
1730 | ret = lttng_metadata_printf(session, | |
1731 | "struct {\n"); | |
1732 | if (ret) | |
1733 | return ret; | |
1734 | nr_fields = type->u._struct.nr_fields; | |
1735 | for (i = 0; i < nr_fields; i++) { | |
1736 | const struct lttng_event_field *iter_field; | |
1737 | ||
1738 | iter_field = &type->u._struct.fields[i]; | |
1739 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1740 | if (ret) | |
1741 | return ret; | |
1742 | } | |
1743 | ret = print_tabs(session, nesting); | |
1744 | if (ret) | |
1745 | return ret; | |
1746 | ret = lttng_metadata_printf(session, | |
1747 | "}"); | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * Must be called with sessions_mutex held. | |
1753 | */ | |
1754 | static | |
1755 | int _lttng_struct_statedump(struct lttng_session *session, | |
1756 | const struct lttng_event_field *field, | |
1757 | size_t nesting) | |
1758 | { | |
1759 | int ret; | |
1760 | ||
1761 | ret = _lttng_struct_type_statedump(session, | |
1762 | &field->type, nesting); | |
1763 | if (ret) | |
1764 | return ret; | |
1765 | ret = lttng_metadata_printf(session, | |
1766 | "_%s;\n", | |
1767 | field->name); | |
1768 | return ret; | |
1769 | } | |
1770 | ||
65c85aa6 MD |
1771 | /* |
1772 | * Must be called with sessions_mutex held. | |
1773 | */ | |
1774 | static | |
1775 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1776 | const struct lttng_type *type, | |
1777 | size_t nesting) | |
1778 | { | |
1779 | int ret; | |
1780 | uint32_t i, nr_choices; | |
1781 | ||
1782 | ret = print_tabs(session, nesting); | |
1783 | if (ret) | |
1784 | return ret; | |
1785 | ret = lttng_metadata_printf(session, | |
1786 | "variant <_%s> {\n", | |
1787 | type->u.variant.tag_name); | |
1788 | if (ret) | |
1789 | return ret; | |
1790 | nr_choices = type->u.variant.nr_choices; | |
1791 | for (i = 0; i < nr_choices; i++) { | |
1792 | const struct lttng_event_field *iter_field; | |
1793 | ||
1794 | iter_field = &type->u.variant.choices[i]; | |
1795 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1796 | if (ret) | |
1797 | return ret; | |
1798 | } | |
1799 | ret = print_tabs(session, nesting); | |
1800 | if (ret) | |
1801 | return ret; | |
1802 | ret = lttng_metadata_printf(session, | |
1803 | "}"); | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1807 | /* | |
1808 | * Must be called with sessions_mutex held. | |
1809 | */ | |
1810 | static | |
1811 | int _lttng_variant_statedump(struct lttng_session *session, | |
1812 | const struct lttng_event_field *field, | |
1813 | size_t nesting) | |
1814 | { | |
1815 | int ret; | |
1816 | ||
1817 | ret = _lttng_variant_type_statedump(session, | |
1818 | &field->type, nesting); | |
1819 | if (ret) | |
1820 | return ret; | |
1821 | ret = lttng_metadata_printf(session, | |
1822 | "_%s;\n", | |
1823 | field->name); | |
1824 | return ret; | |
1825 | } | |
1826 | ||
f513b2bf MD |
1827 | /* |
1828 | * Must be called with sessions_mutex held. | |
1829 | */ | |
1830 | static | |
1831 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1832 | const struct lttng_event_field *field, | |
1833 | size_t nesting) | |
1834 | { | |
1835 | int ret; | |
1836 | const struct lttng_type *elem_type; | |
1837 | ||
65c85aa6 | 1838 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1839 | elem_type = field->type.u.array_compound.elem_type; |
1840 | switch (elem_type->atype) { | |
1841 | case atype_struct: | |
1842 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1843 | if (ret) | |
1844 | return ret; | |
1845 | break; | |
65c85aa6 MD |
1846 | case atype_variant: |
1847 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1848 | if (ret) | |
1849 | return ret; | |
1850 | break; | |
f513b2bf MD |
1851 | default: |
1852 | return -EINVAL; | |
1853 | } | |
1854 | ret = lttng_metadata_printf(session, | |
1855 | " _%s[%u];\n", | |
1856 | field->name, | |
1857 | field->type.u.array_compound.length); | |
1858 | return ret; | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * Must be called with sessions_mutex held. | |
1863 | */ | |
1864 | static | |
1865 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1866 | const struct lttng_event_field *field, | |
1867 | size_t nesting) | |
1868 | { | |
1869 | int ret; | |
1870 | const char *length_name; | |
1871 | const struct lttng_type *elem_type; | |
1872 | ||
1873 | length_name = field->type.u.sequence_compound.length_name; | |
1874 | ||
65c85aa6 | 1875 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1876 | elem_type = field->type.u.sequence_compound.elem_type; |
1877 | switch (elem_type->atype) { | |
1878 | case atype_struct: | |
1879 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1880 | if (ret) | |
1881 | return ret; | |
1882 | break; | |
65c85aa6 MD |
1883 | case atype_variant: |
1884 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1885 | if (ret) | |
1886 | return ret; | |
1887 | break; | |
f513b2bf MD |
1888 | default: |
1889 | return -EINVAL; | |
1890 | } | |
1891 | ret = lttng_metadata_printf(session, | |
1892 | " _%s[ _%s ];\n", | |
1893 | field->name, | |
1894 | length_name); | |
1895 | return ret; | |
1896 | } | |
1897 | ||
141ddf28 MD |
1898 | /* |
1899 | * Must be called with sessions_mutex held. | |
1900 | */ | |
1901 | static | |
1902 | int _lttng_enum_statedump(struct lttng_session *session, | |
1903 | const struct lttng_event_field *field, | |
1904 | size_t nesting) | |
1905 | { | |
1906 | const struct lttng_enum_desc *enum_desc; | |
1907 | const struct lttng_integer_type *container_type; | |
1908 | int ret; | |
1909 | unsigned int i, nr_entries; | |
1910 | ||
1911 | enum_desc = field->type.u.basic.enumeration.desc; | |
1912 | container_type = &field->type.u.basic.enumeration.container_type; | |
1913 | nr_entries = enum_desc->nr_entries; | |
1914 | ||
1915 | ret = print_tabs(session, nesting); | |
1916 | if (ret) | |
1917 | goto end; | |
1918 | ret = lttng_metadata_printf(session, | |
578e68ec | 1919 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1920 | container_type->size, |
1921 | container_type->alignment, | |
1922 | container_type->signedness, | |
1923 | (container_type->encoding == lttng_encode_none) | |
1924 | ? "none" | |
1925 | : (container_type->encoding == lttng_encode_UTF8) | |
1926 | ? "UTF8" | |
1927 | : "ASCII", | |
578e68ec GB |
1928 | container_type->base, |
1929 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1930 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1931 | #else | |
1932 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1933 | #endif | |
1934 | ); | |
141ddf28 MD |
1935 | if (ret) |
1936 | goto end; | |
1937 | /* Dump all entries */ | |
1938 | for (i = 0; i < nr_entries; i++) { | |
1939 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1940 | int j, len; | |
1941 | ||
1942 | ret = print_tabs(session, nesting + 1); | |
1943 | if (ret) | |
1944 | goto end; | |
1945 | ret = lttng_metadata_printf(session, | |
1946 | "\""); | |
1947 | if (ret) | |
1948 | goto end; | |
1949 | len = strlen(entry->string); | |
1950 | /* Escape the character '"' */ | |
1951 | for (j = 0; j < len; j++) { | |
1952 | char c = entry->string[j]; | |
1953 | ||
1954 | switch (c) { | |
1955 | case '"': | |
1956 | ret = lttng_metadata_printf(session, | |
1957 | "\\\""); | |
1958 | break; | |
1959 | case '\\': | |
1960 | ret = lttng_metadata_printf(session, | |
1961 | "\\\\"); | |
1962 | break; | |
1963 | default: | |
1964 | ret = lttng_metadata_printf(session, | |
1965 | "%c", c); | |
1966 | break; | |
1967 | } | |
1968 | if (ret) | |
1969 | goto end; | |
1970 | } | |
08ad1061 PP |
1971 | ret = lttng_metadata_printf(session, "\""); |
1972 | if (ret) | |
1973 | goto end; | |
1974 | ||
1975 | if (entry->options.is_auto) { | |
1976 | ret = lttng_metadata_printf(session, ",\n"); | |
1977 | if (ret) | |
1978 | goto end; | |
141ddf28 | 1979 | } else { |
7c559490 MD |
1980 | ret = lttng_metadata_printf(session, |
1981 | " = "); | |
1982 | if (ret) | |
1983 | goto end; | |
1984 | if (entry->start.signedness) | |
141ddf28 | 1985 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1986 | "%lld", (long long) entry->start.value); |
1987 | else | |
1988 | ret = lttng_metadata_printf(session, | |
1989 | "%llu", entry->start.value); | |
1990 | if (ret) | |
1991 | goto end; | |
1992 | if (entry->start.signedness == entry->end.signedness && | |
1993 | entry->start.value | |
1994 | == entry->end.value) { | |
141ddf28 | 1995 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1996 | ",\n"); |
1997 | } else { | |
1998 | if (entry->end.signedness) { | |
1999 | ret = lttng_metadata_printf(session, | |
2000 | " ... %lld,\n", | |
2001 | (long long) entry->end.value); | |
2002 | } else { | |
2003 | ret = lttng_metadata_printf(session, | |
2004 | " ... %llu,\n", | |
2005 | entry->end.value); | |
2006 | } | |
141ddf28 | 2007 | } |
7c559490 MD |
2008 | if (ret) |
2009 | goto end; | |
141ddf28 | 2010 | } |
141ddf28 MD |
2011 | } |
2012 | ret = print_tabs(session, nesting); | |
2013 | if (ret) | |
2014 | goto end; | |
2015 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2016 | field->name); | |
2017 | end: | |
2018 | return ret; | |
2019 | } | |
2020 | ||
d83004aa JD |
2021 | /* |
2022 | * Must be called with sessions_mutex held. | |
2023 | */ | |
c099397a | 2024 | static |
a90917c3 | 2025 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2026 | const struct lttng_event_field *field, |
2027 | size_t nesting) | |
c099397a | 2028 | { |
c099397a | 2029 | int ret = 0; |
c099397a | 2030 | |
8070f5c0 MD |
2031 | switch (field->type.atype) { |
2032 | case atype_integer: | |
f513b2bf MD |
2033 | ret = print_tabs(session, nesting); |
2034 | if (ret) | |
2035 | return ret; | |
8070f5c0 | 2036 | ret = lttng_metadata_printf(session, |
f513b2bf | 2037 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2038 | field->type.u.basic.integer.size, |
2039 | field->type.u.basic.integer.alignment, | |
2040 | field->type.u.basic.integer.signedness, | |
2041 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2042 | ? "none" | |
2043 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2044 | ? "UTF8" | |
2045 | : "ASCII", | |
2046 | field->type.u.basic.integer.base, | |
5214fa50 | 2047 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2048 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2049 | #else |
8070f5c0 | 2050 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2051 | #endif |
8070f5c0 MD |
2052 | field->name); |
2053 | break; | |
2054 | case atype_enum: | |
141ddf28 | 2055 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2056 | break; |
2057 | case atype_array: | |
2058 | { | |
2059 | const struct lttng_basic_type *elem_type; | |
2060 | ||
2061 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2062 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2063 | ret = print_tabs(session, nesting); |
2064 | if (ret) | |
2065 | return ret; | |
43803cf2 | 2066 | ret = lttng_metadata_printf(session, |
f513b2bf | 2067 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2068 | field->type.u.array.elem_alignment * CHAR_BIT, |
2069 | field->name); | |
2070 | if (ret) | |
2071 | return ret; | |
2072 | } | |
f513b2bf MD |
2073 | ret = print_tabs(session, nesting); |
2074 | if (ret) | |
2075 | return ret; | |
8070f5c0 | 2076 | ret = lttng_metadata_printf(session, |
f513b2bf | 2077 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2078 | elem_type->u.basic.integer.size, |
2079 | elem_type->u.basic.integer.alignment, | |
2080 | elem_type->u.basic.integer.signedness, | |
2081 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2082 | ? "none" | |
2083 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2084 | ? "UTF8" | |
2085 | : "ASCII", | |
2086 | elem_type->u.basic.integer.base, | |
5214fa50 | 2087 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2088 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2089 | #else |
8070f5c0 | 2090 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2091 | #endif |
8070f5c0 MD |
2092 | field->name, field->type.u.array.length); |
2093 | break; | |
2094 | } | |
2095 | case atype_sequence: | |
2096 | { | |
2097 | const struct lttng_basic_type *elem_type; | |
2098 | const struct lttng_basic_type *length_type; | |
2099 | ||
2100 | elem_type = &field->type.u.sequence.elem_type; | |
2101 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2102 | ret = print_tabs(session, nesting); |
2103 | if (ret) | |
2104 | return ret; | |
8070f5c0 | 2105 | ret = lttng_metadata_printf(session, |
f513b2bf | 2106 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2107 | length_type->u.basic.integer.size, |
32257272 | 2108 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2109 | length_type->u.basic.integer.signedness, |
2110 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2111 | ? "none" | |
0635cdd4 | 2112 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2113 | ? "UTF8" |
0635cdd4 | 2114 | : "ASCII"), |
8070f5c0 | 2115 | length_type->u.basic.integer.base, |
5214fa50 | 2116 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2117 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2118 | #else |
0635cdd4 | 2119 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2120 | #endif |
27d2368e MD |
2121 | field->name); |
2122 | if (ret) | |
2123 | return ret; | |
2124 | ||
43803cf2 | 2125 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2126 | ret = print_tabs(session, nesting); |
2127 | if (ret) | |
2128 | return ret; | |
43803cf2 | 2129 | ret = lttng_metadata_printf(session, |
f513b2bf | 2130 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2131 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2132 | field->name); | |
2133 | if (ret) | |
2134 | return ret; | |
2135 | } | |
f513b2bf MD |
2136 | ret = print_tabs(session, nesting); |
2137 | if (ret) | |
2138 | return ret; | |
27d2368e | 2139 | ret = lttng_metadata_printf(session, |
f513b2bf | 2140 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2141 | elem_type->u.basic.integer.size, |
32257272 | 2142 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2143 | elem_type->u.basic.integer.signedness, |
2144 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2145 | ? "none" | |
0635cdd4 | 2146 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2147 | ? "UTF8" |
0635cdd4 | 2148 | : "ASCII"), |
8070f5c0 | 2149 | elem_type->u.basic.integer.base, |
5214fa50 | 2150 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2151 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2152 | #else |
8070f5c0 | 2153 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2154 | #endif |
8070f5c0 | 2155 | field->name, |
27d2368e | 2156 | field->name); |
8070f5c0 MD |
2157 | break; |
2158 | } | |
c099397a | 2159 | |
8070f5c0 MD |
2160 | case atype_string: |
2161 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2162 | ret = print_tabs(session, nesting); |
2163 | if (ret) | |
2164 | return ret; | |
8070f5c0 | 2165 | ret = lttng_metadata_printf(session, |
f513b2bf | 2166 | "string%s _%s;\n", |
8070f5c0 MD |
2167 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2168 | " { encoding = ASCII; }" : "", | |
2169 | field->name); | |
2170 | break; | |
f513b2bf MD |
2171 | case atype_struct: |
2172 | ret = _lttng_struct_statedump(session, field, nesting); | |
2173 | break; | |
2174 | case atype_array_compound: | |
2175 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2176 | break; | |
2177 | case atype_sequence_compound: | |
2178 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2179 | break; | |
65c85aa6 MD |
2180 | case atype_variant: |
2181 | ret = _lttng_variant_statedump(session, field, nesting); | |
2182 | break; | |
f513b2bf | 2183 | |
8070f5c0 MD |
2184 | default: |
2185 | WARN_ON_ONCE(1); | |
2186 | return -EINVAL; | |
2187 | } | |
2188 | return ret; | |
2189 | } | |
2190 | ||
2191 | static | |
a90917c3 | 2192 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2193 | struct lttng_ctx *ctx) |
2194 | { | |
2195 | int ret = 0; | |
2196 | int i; | |
2197 | ||
2198 | if (!ctx) | |
2199 | return 0; | |
2200 | for (i = 0; i < ctx->nr_fields; i++) { | |
2201 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2202 | ||
f513b2bf | 2203 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2204 | if (ret) |
2205 | return ret; | |
2206 | } | |
2207 | return ret; | |
2208 | } | |
2209 | ||
2210 | static | |
a90917c3 MD |
2211 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2212 | struct lttng_event *event) | |
8070f5c0 MD |
2213 | { |
2214 | const struct lttng_event_desc *desc = event->desc; | |
2215 | int ret = 0; | |
2216 | int i; | |
2217 | ||
2218 | for (i = 0; i < desc->nr_fields; i++) { | |
2219 | const struct lttng_event_field *field = &desc->fields[i]; | |
2220 | ||
f513b2bf | 2221 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2222 | if (ret) |
2223 | return ret; | |
c099397a MD |
2224 | } |
2225 | return ret; | |
2226 | } | |
2227 | ||
d83004aa JD |
2228 | /* |
2229 | * Must be called with sessions_mutex held. | |
2230 | */ | |
c099397a | 2231 | static |
a90917c3 MD |
2232 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2233 | struct lttng_channel *chan, | |
2234 | struct lttng_event *event) | |
c099397a MD |
2235 | { |
2236 | int ret = 0; | |
2237 | ||
acb98454 | 2238 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2239 | return 0; |
d83004aa | 2240 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2241 | return 0; |
2242 | ||
2243 | ret = lttng_metadata_printf(session, | |
2244 | "event {\n" | |
ae734547 | 2245 | " name = \"%s\";\n" |
c099397a | 2246 | " id = %u;\n" |
b9074a1b | 2247 | " stream_id = %u;\n", |
c099397a MD |
2248 | event->desc->name, |
2249 | event->id, | |
2250 | event->chan->id); | |
2251 | if (ret) | |
2252 | goto end; | |
2253 | ||
b9074a1b MD |
2254 | if (event->ctx) { |
2255 | ret = lttng_metadata_printf(session, | |
2256 | " context := struct {\n"); | |
2257 | if (ret) | |
2258 | goto end; | |
2259 | } | |
a90917c3 | 2260 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2261 | if (ret) |
2262 | goto end; | |
b9074a1b MD |
2263 | if (event->ctx) { |
2264 | ret = lttng_metadata_printf(session, | |
2265 | " };\n"); | |
2266 | if (ret) | |
2267 | goto end; | |
2268 | } | |
8070f5c0 MD |
2269 | |
2270 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2271 | " fields := struct {\n" |
2272 | ); | |
2273 | if (ret) | |
2274 | goto end; | |
2275 | ||
a90917c3 | 2276 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2277 | if (ret) |
2278 | goto end; | |
2279 | ||
2280 | /* | |
2281 | * LTTng space reservation can only reserve multiples of the | |
2282 | * byte size. | |
2283 | */ | |
2284 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2285 | " };\n" |
2286 | "};\n\n"); | |
c099397a MD |
2287 | if (ret) |
2288 | goto end; | |
2289 | ||
c099397a MD |
2290 | event->metadata_dumped = 1; |
2291 | end: | |
2292 | return ret; | |
2293 | ||
2294 | } | |
2295 | ||
d83004aa JD |
2296 | /* |
2297 | * Must be called with sessions_mutex held. | |
2298 | */ | |
c099397a | 2299 | static |
a90917c3 MD |
2300 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2301 | struct lttng_channel *chan) | |
c099397a MD |
2302 | { |
2303 | int ret = 0; | |
2304 | ||
acb98454 | 2305 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2306 | return 0; |
d83004aa JD |
2307 | |
2308 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2309 | return 0; |
2310 | ||
2311 | WARN_ON_ONCE(!chan->header_type); | |
2312 | ret = lttng_metadata_printf(session, | |
2313 | "stream {\n" | |
2314 | " id = %u;\n" | |
9115fbdc | 2315 | " event.header := %s;\n" |
b9074a1b | 2316 | " packet.context := struct packet_context;\n", |
c099397a MD |
2317 | chan->id, |
2318 | chan->header_type == 1 ? "struct event_header_compact" : | |
2319 | "struct event_header_large"); | |
2320 | if (ret) | |
2321 | goto end; | |
2322 | ||
b9074a1b MD |
2323 | if (chan->ctx) { |
2324 | ret = lttng_metadata_printf(session, | |
2325 | " event.context := struct {\n"); | |
2326 | if (ret) | |
2327 | goto end; | |
2328 | } | |
a90917c3 | 2329 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2330 | if (ret) |
2331 | goto end; | |
b9074a1b MD |
2332 | if (chan->ctx) { |
2333 | ret = lttng_metadata_printf(session, | |
2334 | " };\n"); | |
2335 | if (ret) | |
2336 | goto end; | |
2337 | } | |
8070f5c0 MD |
2338 | |
2339 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2340 | "};\n\n"); |
8070f5c0 | 2341 | |
c099397a MD |
2342 | chan->metadata_dumped = 1; |
2343 | end: | |
2344 | return ret; | |
2345 | } | |
2346 | ||
d83004aa JD |
2347 | /* |
2348 | * Must be called with sessions_mutex held. | |
2349 | */ | |
9115fbdc | 2350 | static |
a90917c3 | 2351 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2352 | { |
2353 | return lttng_metadata_printf(session, | |
2354 | "struct packet_context {\n" | |
a3ccff4f MD |
2355 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2356 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2357 | " uint64_t content_size;\n" |
2358 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2359 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2360 | " unsigned long events_discarded;\n" |
9115fbdc | 2361 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2362 | "};\n\n" |
9115fbdc MD |
2363 | ); |
2364 | } | |
2365 | ||
2366 | /* | |
2367 | * Compact header: | |
2368 | * id: range: 0 - 30. | |
2369 | * id 31 is reserved to indicate an extended header. | |
2370 | * | |
2371 | * Large header: | |
2372 | * id: range: 0 - 65534. | |
2373 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2374 | * |
2375 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2376 | */ |
2377 | static | |
a90917c3 | 2378 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2379 | { |
2380 | return lttng_metadata_printf(session, | |
2381 | "struct event_header_compact {\n" | |
2382 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2383 | " variant <id> {\n" | |
2384 | " struct {\n" | |
a3ccff4f | 2385 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2386 | " } compact;\n" |
2387 | " struct {\n" | |
2388 | " uint32_t id;\n" | |
a3ccff4f | 2389 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2390 | " } extended;\n" |
2391 | " } v;\n" | |
2392 | "} align(%u);\n" | |
2393 | "\n" | |
2394 | "struct event_header_large {\n" | |
2395 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2396 | " variant <id> {\n" | |
2397 | " struct {\n" | |
a3ccff4f | 2398 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2399 | " } compact;\n" |
2400 | " struct {\n" | |
2401 | " uint32_t id;\n" | |
a3ccff4f | 2402 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2403 | " } extended;\n" |
2404 | " } v;\n" | |
2405 | "} align(%u);\n\n", | |
a90917c3 MD |
2406 | lttng_alignof(uint32_t) * CHAR_BIT, |
2407 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2408 | ); |
2409 | } | |
2410 | ||
a3ccff4f MD |
2411 | /* |
2412 | * Approximation of NTP time of day to clock monotonic correlation, | |
2413 | * taken at start of trace. | |
2414 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2415 | * in future versions. | |
5283350b MD |
2416 | * This function may return a negative offset. It may happen if the |
2417 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2418 | */ |
2419 | static | |
8967b2a3 | 2420 | int64_t measure_clock_offset(void) |
a3ccff4f | 2421 | { |
dcb93448 | 2422 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2423 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2424 | int64_t offset; |
a3ccff4f MD |
2425 | struct timespec rts = { 0, 0 }; |
2426 | unsigned long flags; | |
2427 | ||
2428 | /* Disable interrupts to increase correlation precision. */ | |
2429 | local_irq_save(flags); | |
2430 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2431 | getnstimeofday(&rts); |
a3ccff4f MD |
2432 | monotonic[1] = trace_clock_read64(); |
2433 | local_irq_restore(flags); | |
2434 | ||
dcb93448 | 2435 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2436 | realtime = (uint64_t) rts.tv_sec * tcf; |
2437 | if (tcf == NSEC_PER_SEC) { | |
2438 | realtime += rts.tv_nsec; | |
2439 | } else { | |
2440 | uint64_t n = rts.tv_nsec * tcf; | |
2441 | ||
2442 | do_div(n, NSEC_PER_SEC); | |
2443 | realtime += n; | |
2444 | } | |
dcb93448 | 2445 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2446 | return offset; |
2447 | } | |
2448 | ||
c099397a MD |
2449 | /* |
2450 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2451 | * Must be called with sessions_mutex held. |
c099397a MD |
2452 | */ |
2453 | static | |
a90917c3 | 2454 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2455 | { |
30bdb6e4 | 2456 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2457 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2458 | struct lttng_channel *chan; |
2459 | struct lttng_event *event; | |
c099397a MD |
2460 | int ret = 0; |
2461 | ||
acb98454 | 2462 | if (!READ_ONCE(session->active)) |
c099397a MD |
2463 | return 0; |
2464 | if (session->metadata_dumped) | |
2465 | goto skip_session; | |
c099397a | 2466 | |
d793d5e1 | 2467 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2468 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2469 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2470 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2471 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2472 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2473 | |
2474 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2475 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2476 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2477 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2478 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2479 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2480 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2481 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2482 | "\n" |
2483 | "trace {\n" | |
2484 | " major = %u;\n" | |
2485 | " minor = %u;\n" | |
30bdb6e4 | 2486 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2487 | " byte_order = %s;\n" |
2488 | " packet.header := struct {\n" | |
2489 | " uint32_t magic;\n" | |
1ec3f75a | 2490 | " uint8_t uuid[16];\n" |
d793d5e1 | 2491 | " uint32_t stream_id;\n" |
5594698f | 2492 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2493 | " };\n" |
d793d5e1 | 2494 | "};\n\n", |
a90917c3 MD |
2495 | lttng_alignof(uint8_t) * CHAR_BIT, |
2496 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2497 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2498 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2499 | sizeof(unsigned long) * CHAR_BIT, |
2500 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2501 | CTF_SPEC_MAJOR, |
2502 | CTF_SPEC_MINOR, | |
d793d5e1 | 2503 | uuid_s, |
5214fa50 | 2504 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2505 | "be" |
2506 | #else | |
2507 | "le" | |
2508 | #endif | |
2509 | ); | |
2510 | if (ret) | |
2511 | goto end; | |
2512 | ||
99dc9597 MD |
2513 | ret = lttng_metadata_printf(session, |
2514 | "env {\n" | |
a6058143 | 2515 | " hostname = \"%s\";\n" |
c6c9e10f | 2516 | " domain = \"kernel\";\n" |
99dc9597 | 2517 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2518 | " kernel_release = \"%s\";\n" |
2519 | " kernel_version = \"%s\";\n" | |
2520 | " tracer_name = \"lttng-modules\";\n" | |
2521 | " tracer_major = %d;\n" | |
2522 | " tracer_minor = %d;\n" | |
2523 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2524 | "};\n\n", |
3d0d43db | 2525 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2526 | utsname()->sysname, |
2527 | utsname()->release, | |
c6c9e10f MD |
2528 | utsname()->version, |
2529 | LTTNG_MODULES_MAJOR_VERSION, | |
2530 | LTTNG_MODULES_MINOR_VERSION, | |
2531 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2532 | ); |
2533 | if (ret) | |
2534 | goto end; | |
2535 | ||
a3ccff4f MD |
2536 | ret = lttng_metadata_printf(session, |
2537 | "clock {\n" | |
2754583e MD |
2538 | " name = \"%s\";\n", |
2539 | trace_clock_name() | |
a82c63f1 MD |
2540 | ); |
2541 | if (ret) | |
2542 | goto end; | |
2543 | ||
2544 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2545 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2546 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2547 | clock_uuid_s |
2548 | ); | |
2549 | if (ret) | |
2550 | goto end; | |
2551 | } | |
2552 | ||
2553 | ret = lttng_metadata_printf(session, | |
2754583e | 2554 | " description = \"%s\";\n" |
a3ccff4f MD |
2555 | " freq = %llu; /* Frequency, in Hz */\n" |
2556 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2557 | " offset = %lld;\n" |
a3ccff4f | 2558 | "};\n\n", |
2754583e | 2559 | trace_clock_description(), |
a3ccff4f | 2560 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2561 | (long long) measure_clock_offset() |
a3ccff4f MD |
2562 | ); |
2563 | if (ret) | |
2564 | goto end; | |
2565 | ||
2566 | ret = lttng_metadata_printf(session, | |
2567 | "typealias integer {\n" | |
2568 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2569 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2570 | "} := uint27_clock_monotonic_t;\n" |
2571 | "\n" | |
2572 | "typealias integer {\n" | |
2573 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2574 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2575 | "} := uint32_clock_monotonic_t;\n" |
2576 | "\n" | |
2577 | "typealias integer {\n" | |
2578 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2579 | " map = clock.%s.value;\n" |
a3ccff4f | 2580 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2581 | trace_clock_name(), |
a3ccff4f | 2582 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2583 | trace_clock_name(), |
2584 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2585 | trace_clock_name() | |
a3ccff4f MD |
2586 | ); |
2587 | if (ret) | |
2588 | goto end; | |
2589 | ||
a90917c3 | 2590 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2591 | if (ret) |
2592 | goto end; | |
2593 | ||
a90917c3 | 2594 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2595 | if (ret) |
2596 | goto end; | |
2597 | ||
c099397a MD |
2598 | skip_session: |
2599 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2600 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2601 | if (ret) |
2602 | goto end; | |
2603 | } | |
2604 | ||
2605 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2606 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2607 | if (ret) |
2608 | goto end; | |
2609 | } | |
2610 | session->metadata_dumped = 1; | |
2611 | end: | |
2612 | return ret; | |
2613 | } | |
2614 | ||
c0e31d2e | 2615 | /** |
a90917c3 | 2616 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2617 | * @transport: transport structure |
2618 | * | |
2619 | * Registers a transport which can be used as output to extract the data out of | |
2620 | * LTTng. The module calling this registration function must ensure that no | |
2621 | * trap-inducing code will be executed by the transport functions. E.g. | |
2622 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2623 | * is made visible to the transport function. This registration acts as a | |
2624 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2625 | * after its registration must it synchronize the TLBs. | |
2626 | */ | |
a90917c3 | 2627 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2628 | { |
2629 | /* | |
2630 | * Make sure no page fault can be triggered by the module about to be | |
2631 | * registered. We deal with this here so we don't have to call | |
2632 | * vmalloc_sync_all() in each module's init. | |
2633 | */ | |
6d2a620c | 2634 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2635 | |
2636 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2637 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2638 | mutex_unlock(&sessions_mutex); |
2639 | } | |
a90917c3 | 2640 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2641 | |
2642 | /** | |
a90917c3 | 2643 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2644 | * @transport: transport structure |
2645 | */ | |
a90917c3 | 2646 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2647 | { |
2648 | mutex_lock(&sessions_mutex); | |
2649 | list_del(&transport->node); | |
2650 | mutex_unlock(&sessions_mutex); | |
2651 | } | |
a90917c3 | 2652 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2653 | |
1759a734 | 2654 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2655 | |
2656 | enum cpuhp_state lttng_hp_prepare; | |
2657 | enum cpuhp_state lttng_hp_online; | |
2658 | ||
2659 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2660 | { | |
2661 | struct lttng_cpuhp_node *lttng_node; | |
2662 | ||
2663 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2664 | switch (lttng_node->component) { | |
2665 | case LTTNG_RING_BUFFER_FRONTEND: | |
2666 | return 0; | |
2667 | case LTTNG_RING_BUFFER_BACKEND: | |
2668 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2669 | case LTTNG_RING_BUFFER_ITER: | |
2670 | return 0; | |
2671 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2672 | return 0; | |
2673 | default: | |
2674 | return -EINVAL; | |
2675 | } | |
2676 | } | |
2677 | ||
2678 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2679 | { | |
2680 | struct lttng_cpuhp_node *lttng_node; | |
2681 | ||
2682 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2683 | switch (lttng_node->component) { | |
2684 | case LTTNG_RING_BUFFER_FRONTEND: | |
2685 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2686 | case LTTNG_RING_BUFFER_BACKEND: | |
2687 | return 0; | |
2688 | case LTTNG_RING_BUFFER_ITER: | |
2689 | return 0; | |
2690 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2691 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2692 | default: | |
2693 | return -EINVAL; | |
2694 | } | |
2695 | } | |
2696 | ||
2697 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2698 | { | |
2699 | struct lttng_cpuhp_node *lttng_node; | |
2700 | ||
2701 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2702 | switch (lttng_node->component) { | |
2703 | case LTTNG_RING_BUFFER_FRONTEND: | |
2704 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2705 | case LTTNG_RING_BUFFER_BACKEND: | |
2706 | return 0; | |
2707 | case LTTNG_RING_BUFFER_ITER: | |
2708 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2709 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2710 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2711 | default: | |
2712 | return -EINVAL; | |
2713 | } | |
2714 | } | |
2715 | ||
2716 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2717 | { | |
2718 | struct lttng_cpuhp_node *lttng_node; | |
2719 | ||
2720 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2721 | switch (lttng_node->component) { | |
2722 | case LTTNG_RING_BUFFER_FRONTEND: | |
2723 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2724 | case LTTNG_RING_BUFFER_BACKEND: | |
2725 | return 0; | |
2726 | case LTTNG_RING_BUFFER_ITER: | |
2727 | return 0; | |
2728 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2729 | return 0; | |
2730 | default: | |
2731 | return -EINVAL; | |
2732 | } | |
2733 | } | |
2734 | ||
2735 | static int __init lttng_init_cpu_hotplug(void) | |
2736 | { | |
2737 | int ret; | |
2738 | ||
2739 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2740 | lttng_hotplug_prepare, | |
2741 | lttng_hotplug_dead); | |
2742 | if (ret < 0) { | |
2743 | return ret; | |
2744 | } | |
2745 | lttng_hp_prepare = ret; | |
2746 | lttng_rb_set_hp_prepare(ret); | |
2747 | ||
2748 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2749 | lttng_hotplug_online, | |
2750 | lttng_hotplug_offline); | |
2751 | if (ret < 0) { | |
2752 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2753 | lttng_hp_prepare = 0; | |
2754 | return ret; | |
2755 | } | |
2756 | lttng_hp_online = ret; | |
2757 | lttng_rb_set_hp_online(ret); | |
2758 | ||
2759 | return 0; | |
2760 | } | |
2761 | ||
2762 | static void __exit lttng_exit_cpu_hotplug(void) | |
2763 | { | |
2764 | lttng_rb_set_hp_online(0); | |
2765 | cpuhp_remove_multi_state(lttng_hp_online); | |
2766 | lttng_rb_set_hp_prepare(0); | |
2767 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2768 | } | |
2769 | ||
00e00f24 | 2770 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2771 | static int lttng_init_cpu_hotplug(void) |
2772 | { | |
2773 | return 0; | |
2774 | } | |
2775 | static void lttng_exit_cpu_hotplug(void) | |
2776 | { | |
2777 | } | |
00e00f24 | 2778 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2779 | |
2780 | ||
a90917c3 | 2781 | static int __init lttng_events_init(void) |
4e3c1b9b | 2782 | { |
1c25284c MD |
2783 | int ret; |
2784 | ||
453b2495 JD |
2785 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2786 | if (ret) | |
2787 | return ret; | |
389d7070 | 2788 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2789 | if (ret) |
2790 | return ret; | |
2791 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2792 | if (ret) |
2793 | return ret; | |
2794 | ret = lttng_probes_init(); | |
389d7070 MD |
2795 | if (ret) |
2796 | return ret; | |
07dfc1d0 | 2797 | ret = lttng_context_init(); |
20591cf7 MD |
2798 | if (ret) |
2799 | return ret; | |
07dfc1d0 MD |
2800 | ret = lttng_tracepoint_init(); |
2801 | if (ret) | |
2802 | goto error_tp; | |
a90917c3 | 2803 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2804 | if (!event_cache) { |
2805 | ret = -ENOMEM; | |
2806 | goto error_kmem; | |
2807 | } | |
80996790 | 2808 | ret = lttng_abi_init(); |
02119ee5 MD |
2809 | if (ret) |
2810 | goto error_abi; | |
0c956676 MD |
2811 | ret = lttng_logger_init(); |
2812 | if (ret) | |
2813 | goto error_logger; | |
1e367326 MD |
2814 | ret = lttng_init_cpu_hotplug(); |
2815 | if (ret) | |
2816 | goto error_hotplug; | |
2df5d4b7 | 2817 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2818 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2819 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2820 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2821 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2822 | LTTNG_VERSION_NAME, |
2823 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2824 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2825 | #else | |
2826 | "", | |
2827 | #endif | |
2828 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2829 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2830 | #else | |
2831 | ""); | |
2832 | #endif | |
4e3c1b9b | 2833 | return 0; |
0c956676 | 2834 | |
1e367326 MD |
2835 | error_hotplug: |
2836 | lttng_logger_exit(); | |
0c956676 MD |
2837 | error_logger: |
2838 | lttng_abi_exit(); | |
02119ee5 | 2839 | error_abi: |
1c25284c | 2840 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2841 | error_kmem: |
2842 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2843 | error_tp: |
2844 | lttng_context_exit(); | |
2df5d4b7 | 2845 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2846 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2847 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2848 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2849 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2850 | LTTNG_VERSION_NAME, |
2851 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2852 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2853 | #else | |
2854 | "", | |
2855 | #endif | |
2856 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2857 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2858 | #else | |
2859 | ""); | |
2860 | #endif | |
1c25284c | 2861 | return ret; |
4e3c1b9b MD |
2862 | } |
2863 | ||
a90917c3 | 2864 | module_init(lttng_events_init); |
11b5a3c2 | 2865 | |
a90917c3 | 2866 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2867 | { |
a90917c3 | 2868 | struct lttng_session *session, *tmpsession; |
92e94819 | 2869 | |
1e367326 | 2870 | lttng_exit_cpu_hotplug(); |
0c956676 | 2871 | lttng_logger_exit(); |
80996790 | 2872 | lttng_abi_exit(); |
92e94819 | 2873 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2874 | lttng_session_destroy(session); |
11b5a3c2 | 2875 | kmem_cache_destroy(event_cache); |
20591cf7 | 2876 | lttng_tracepoint_exit(); |
07dfc1d0 | 2877 | lttng_context_exit(); |
2df5d4b7 | 2878 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2879 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2880 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2881 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2882 | LTTNG_MODULES_EXTRAVERSION, | |
2df5d4b7 MJ |
2883 | LTTNG_VERSION_NAME, |
2884 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2885 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2886 | #else | |
2887 | "", | |
2888 | #endif | |
2889 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2890 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2891 | #else | |
2892 | ""); | |
2893 | #endif | |
4e3c1b9b | 2894 | } |
92e94819 | 2895 | |
a90917c3 | 2896 | module_exit(lttng_events_exit); |
11b5a3c2 | 2897 | |
2df5d4b7 MJ |
2898 | #include "extra_version/patches.i" |
2899 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2900 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2901 | #endif | |
2902 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2903 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2904 | #endif | |
92e94819 MD |
2905 | MODULE_LICENSE("GPL and additional rights"); |
2906 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2907 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2908 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2909 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2910 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2911 | LTTNG_MODULES_EXTRAVERSION); |