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 MD |
91 | { |
92 | synchronize_sched(); | |
b8590f40 MD |
93 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
94 | #ifdef CONFIG_PREEMPT_RT_FULL | |
95 | synchronize_rcu(); | |
96 | #endif | |
97 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
98 | #ifdef CONFIG_PREEMPT_RT |
99 | synchronize_rcu(); | |
100 | #endif | |
b8590f40 | 101 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
102 | } |
103 | ||
3c997079 MD |
104 | void lttng_lock_sessions(void) |
105 | { | |
106 | mutex_lock(&sessions_mutex); | |
107 | } | |
108 | ||
109 | void lttng_unlock_sessions(void) | |
110 | { | |
111 | mutex_unlock(&sessions_mutex); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Called with sessions lock held. | |
116 | */ | |
117 | int lttng_session_active(void) | |
118 | { | |
119 | struct lttng_session *iter; | |
120 | ||
121 | list_for_each_entry(iter, &sessions, list) { | |
122 | if (iter->active) | |
123 | return 1; | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
a90917c3 | 128 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 129 | { |
a90917c3 | 130 | struct lttng_session *session; |
d83004aa | 131 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 132 | int i; |
4e3c1b9b MD |
133 | |
134 | mutex_lock(&sessions_mutex); | |
a90917c3 | 135 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 136 | if (!session) |
d83004aa | 137 | goto err; |
4e3c1b9b | 138 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 139 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 140 | uuid_le_gen(&session->uuid); |
d83004aa JD |
141 | |
142 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
143 | GFP_KERNEL); | |
144 | if (!metadata_cache) | |
145 | goto err_free_session; | |
f6da044f | 146 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
147 | if (!metadata_cache->data) |
148 | goto err_free_cache; | |
149 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
150 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 151 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
152 | session->metadata_cache = metadata_cache; |
153 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
154 | memcpy(&metadata_cache->uuid, &session->uuid, |
155 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
156 | INIT_LIST_HEAD(&session->enablers_head); |
157 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
158 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
159 | list_add(&session->list, &sessions); |
160 | mutex_unlock(&sessions_mutex); | |
161 | return session; | |
d83004aa JD |
162 | |
163 | err_free_cache: | |
164 | kfree(metadata_cache); | |
165 | err_free_session: | |
166 | kfree(session); | |
167 | err: | |
168 | mutex_unlock(&sessions_mutex); | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | void metadata_cache_destroy(struct kref *kref) | |
173 | { | |
174 | struct lttng_metadata_cache *cache = | |
175 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 176 | vfree(cache->data); |
d83004aa | 177 | kfree(cache); |
4e3c1b9b MD |
178 | } |
179 | ||
a90917c3 | 180 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 181 | { |
a90917c3 MD |
182 | struct lttng_channel *chan, *tmpchan; |
183 | struct lttng_event *event, *tmpevent; | |
d83004aa | 184 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 185 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 186 | int ret; |
4e3c1b9b MD |
187 | |
188 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 189 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
190 | list_for_each_entry(chan, &session->chan, list) { |
191 | ret = lttng_syscalls_unregister(chan); | |
192 | WARN_ON(ret); | |
193 | } | |
dda6a249 | 194 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 195 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
196 | WARN_ON(ret); |
197 | } | |
abcca994 | 198 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
199 | list_for_each_entry_safe(enabler, tmpenabler, |
200 | &session->enablers_head, node) | |
201 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 202 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 203 | _lttng_event_destroy(event); |
d83004aa JD |
204 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
205 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 206 | _lttng_channel_destroy(chan); |
d83004aa JD |
207 | } |
208 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
209 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
210 | if (session->pid_tracker) |
211 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 212 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
213 | list_del(&session->list); |
214 | mutex_unlock(&sessions_mutex); | |
215 | kfree(session); | |
216 | } | |
217 | ||
601252cf MD |
218 | int lttng_session_statedump(struct lttng_session *session) |
219 | { | |
220 | int ret; | |
221 | ||
222 | mutex_lock(&sessions_mutex); | |
223 | ret = lttng_statedump_start(session); | |
224 | mutex_unlock(&sessions_mutex); | |
225 | return ret; | |
226 | } | |
227 | ||
a90917c3 | 228 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
229 | { |
230 | int ret = 0; | |
a90917c3 | 231 | struct lttng_channel *chan; |
c0e31d2e MD |
232 | |
233 | mutex_lock(&sessions_mutex); | |
234 | if (session->active) { | |
235 | ret = -EBUSY; | |
236 | goto end; | |
237 | } | |
c099397a | 238 | |
3c997079 MD |
239 | /* Set transient enabler state to "enabled" */ |
240 | session->tstate = 1; | |
241 | ||
c099397a MD |
242 | /* |
243 | * Snapshot the number of events per channel to know the type of header | |
244 | * we need to use. | |
245 | */ | |
246 | list_for_each_entry(chan, &session->chan, list) { | |
247 | if (chan->header_type) | |
248 | continue; /* don't change it if session stop/restart */ | |
249 | if (chan->free_event_id < 31) | |
250 | chan->header_type = 1; /* compact */ | |
251 | else | |
252 | chan->header_type = 2; /* large */ | |
253 | } | |
254 | ||
3c997079 MD |
255 | /* We need to sync enablers with session before activation. */ |
256 | lttng_session_sync_enablers(session); | |
257 | ||
64af2437 | 258 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
259 | list_for_each_entry(chan, &session->chan, list) { |
260 | if (chan->channel_type != METADATA_CHANNEL) | |
261 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
262 | } | |
64af2437 | 263 | |
52fc2e1f | 264 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 265 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 266 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
267 | if (ret) { |
268 | ACCESS_ONCE(session->active) = 0; | |
269 | goto end; | |
270 | } | |
271 | ret = lttng_statedump_start(session); | |
360f38ea | 272 | if (ret) |
c099397a | 273 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
274 | end: |
275 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 276 | return ret; |
c0e31d2e MD |
277 | } |
278 | ||
a90917c3 | 279 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
280 | { |
281 | int ret = 0; | |
64af2437 | 282 | struct lttng_channel *chan; |
c0e31d2e MD |
283 | |
284 | mutex_lock(&sessions_mutex); | |
285 | if (!session->active) { | |
286 | ret = -EBUSY; | |
287 | goto end; | |
288 | } | |
52fc2e1f | 289 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
290 | |
291 | /* Set transient enabler state to "disabled" */ | |
292 | session->tstate = 0; | |
293 | lttng_session_sync_enablers(session); | |
64af2437 MD |
294 | |
295 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
296 | list_for_each_entry(chan, &session->chan, list) { |
297 | if (chan->channel_type != METADATA_CHANNEL) | |
298 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
299 | } | |
c0e31d2e MD |
300 | end: |
301 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 302 | return ret; |
c0e31d2e MD |
303 | } |
304 | ||
9616f0bf JD |
305 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
306 | { | |
307 | int ret = 0; | |
308 | struct lttng_channel *chan; | |
309 | struct lttng_event *event; | |
310 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
311 | struct lttng_metadata_stream *stream; | |
312 | ||
313 | mutex_lock(&sessions_mutex); | |
314 | if (!session->active) { | |
315 | ret = -EBUSY; | |
316 | goto end; | |
317 | } | |
318 | ||
319 | mutex_lock(&cache->lock); | |
320 | memset(cache->data, 0, cache->cache_alloc); | |
321 | cache->metadata_written = 0; | |
322 | cache->version++; | |
323 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
324 | stream->metadata_out = 0; | |
325 | stream->metadata_in = 0; | |
326 | } | |
327 | mutex_unlock(&cache->lock); | |
328 | ||
329 | session->metadata_dumped = 0; | |
330 | list_for_each_entry(chan, &session->chan, list) { | |
331 | chan->metadata_dumped = 0; | |
332 | } | |
333 | ||
334 | list_for_each_entry(event, &session->events, list) { | |
335 | event->metadata_dumped = 0; | |
336 | } | |
337 | ||
338 | ret = _lttng_session_metadata_statedump(session); | |
339 | ||
340 | end: | |
341 | mutex_unlock(&sessions_mutex); | |
342 | return ret; | |
343 | } | |
344 | ||
345 | ||
346 | ||
a90917c3 | 347 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 348 | { |
3c997079 | 349 | int ret = 0; |
e64957da | 350 | |
3c997079 MD |
351 | mutex_lock(&sessions_mutex); |
352 | if (channel->channel_type == METADATA_CHANNEL) { | |
353 | ret = -EPERM; | |
354 | goto end; | |
355 | } | |
356 | if (channel->enabled) { | |
357 | ret = -EEXIST; | |
358 | goto end; | |
359 | } | |
360 | /* Set transient enabler state to "enabled" */ | |
361 | channel->tstate = 1; | |
362 | lttng_session_sync_enablers(channel->session); | |
363 | /* Set atomically the state to "enabled" */ | |
364 | ACCESS_ONCE(channel->enabled) = 1; | |
365 | end: | |
366 | mutex_unlock(&sessions_mutex); | |
367 | return ret; | |
e64957da MD |
368 | } |
369 | ||
a90917c3 | 370 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 371 | { |
3c997079 | 372 | int ret = 0; |
e64957da | 373 | |
3c997079 MD |
374 | mutex_lock(&sessions_mutex); |
375 | if (channel->channel_type == METADATA_CHANNEL) { | |
376 | ret = -EPERM; | |
377 | goto end; | |
378 | } | |
379 | if (!channel->enabled) { | |
380 | ret = -EEXIST; | |
381 | goto end; | |
382 | } | |
383 | /* Set atomically the state to "disabled" */ | |
384 | ACCESS_ONCE(channel->enabled) = 0; | |
385 | /* Set transient enabler state to "enabled" */ | |
386 | channel->tstate = 0; | |
387 | lttng_session_sync_enablers(channel->session); | |
388 | end: | |
389 | mutex_unlock(&sessions_mutex); | |
390 | return ret; | |
e64957da MD |
391 | } |
392 | ||
a90917c3 | 393 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 394 | { |
3c997079 | 395 | int ret = 0; |
e64957da | 396 | |
3c997079 MD |
397 | mutex_lock(&sessions_mutex); |
398 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
399 | ret = -EPERM; | |
400 | goto end; | |
401 | } | |
402 | if (event->enabled) { | |
403 | ret = -EEXIST; | |
404 | goto end; | |
405 | } | |
a0493bef MD |
406 | switch (event->instrumentation) { |
407 | case LTTNG_KERNEL_TRACEPOINT: | |
408 | case LTTNG_KERNEL_SYSCALL: | |
409 | ret = -EINVAL; | |
410 | break; | |
411 | case LTTNG_KERNEL_KPROBE: | |
412 | case LTTNG_KERNEL_FUNCTION: | |
413 | case LTTNG_KERNEL_NOOP: | |
414 | ACCESS_ONCE(event->enabled) = 1; | |
415 | break; | |
416 | case LTTNG_KERNEL_KRETPROBE: | |
417 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
418 | break; | |
419 | default: | |
420 | WARN_ON_ONCE(1); | |
421 | ret = -EINVAL; | |
422 | } | |
3c997079 MD |
423 | end: |
424 | mutex_unlock(&sessions_mutex); | |
425 | return ret; | |
e64957da MD |
426 | } |
427 | ||
a90917c3 | 428 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 429 | { |
3c997079 | 430 | int ret = 0; |
e64957da | 431 | |
3c997079 MD |
432 | mutex_lock(&sessions_mutex); |
433 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
434 | ret = -EPERM; | |
435 | goto end; | |
436 | } | |
437 | if (!event->enabled) { | |
438 | ret = -EEXIST; | |
439 | goto end; | |
440 | } | |
a0493bef MD |
441 | switch (event->instrumentation) { |
442 | case LTTNG_KERNEL_TRACEPOINT: | |
443 | case LTTNG_KERNEL_SYSCALL: | |
444 | ret = -EINVAL; | |
445 | break; | |
446 | case LTTNG_KERNEL_KPROBE: | |
447 | case LTTNG_KERNEL_FUNCTION: | |
448 | case LTTNG_KERNEL_NOOP: | |
449 | ACCESS_ONCE(event->enabled) = 0; | |
450 | break; | |
451 | case LTTNG_KERNEL_KRETPROBE: | |
452 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
453 | break; | |
454 | default: | |
455 | WARN_ON_ONCE(1); | |
456 | ret = -EINVAL; | |
457 | } | |
3c997079 MD |
458 | end: |
459 | mutex_unlock(&sessions_mutex); | |
460 | return ret; | |
e64957da MD |
461 | } |
462 | ||
a90917c3 | 463 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 464 | { |
a90917c3 | 465 | struct lttng_transport *transport; |
f3d01b96 | 466 | |
a90917c3 | 467 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
468 | if (!strcmp(transport->name, name)) |
469 | return transport; | |
470 | } | |
471 | return NULL; | |
472 | } | |
473 | ||
a90917c3 | 474 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
475 | const char *transport_name, |
476 | void *buf_addr, | |
4e3c1b9b MD |
477 | size_t subbuf_size, size_t num_subbuf, |
478 | unsigned int switch_timer_interval, | |
d83004aa JD |
479 | unsigned int read_timer_interval, |
480 | enum channel_type channel_type) | |
4e3c1b9b | 481 | { |
a90917c3 MD |
482 | struct lttng_channel *chan; |
483 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
484 | |
485 | mutex_lock(&sessions_mutex); | |
d83004aa | 486 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 487 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 488 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
489 | if (!transport) { |
490 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
491 | transport_name); | |
c0e31d2e | 492 | goto notransport; |
f3d01b96 | 493 | } |
a33c9927 MD |
494 | if (!try_module_get(transport->owner)) { |
495 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
496 | goto notransport; | |
497 | } | |
a90917c3 | 498 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 499 | if (!chan) |
c0e31d2e | 500 | goto nomem; |
4e3c1b9b | 501 | chan->session = session; |
05d32c64 | 502 | chan->id = session->free_chan_id++; |
3b731ab1 | 503 | chan->ops = &transport->ops; |
125b4df4 MD |
504 | /* |
505 | * Note: the channel creation op already writes into the packet | |
506 | * headers. Therefore the "chan" information used as input | |
507 | * should be already accessible. | |
508 | */ | |
5f5ddf01 MD |
509 | chan->chan = transport->ops.channel_create(transport_name, |
510 | chan, buf_addr, subbuf_size, num_subbuf, | |
511 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
512 | if (!chan->chan) |
513 | goto create_error; | |
3c997079 | 514 | chan->tstate = 1; |
e64957da | 515 | chan->enabled = 1; |
a33c9927 | 516 | chan->transport = transport; |
d83004aa | 517 | chan->channel_type = channel_type; |
4e3c1b9b MD |
518 | list_add(&chan->list, &session->chan); |
519 | mutex_unlock(&sessions_mutex); | |
520 | return chan; | |
521 | ||
f3d01b96 MD |
522 | create_error: |
523 | kfree(chan); | |
c0e31d2e | 524 | nomem: |
a33c9927 MD |
525 | if (transport) |
526 | module_put(transport->owner); | |
c0e31d2e | 527 | notransport: |
e5382b6d | 528 | active: |
4e3c1b9b MD |
529 | mutex_unlock(&sessions_mutex); |
530 | return NULL; | |
531 | } | |
532 | ||
533 | /* | |
d83004aa JD |
534 | * Only used internally at session destruction for per-cpu channels, and |
535 | * when metadata channel is released. | |
536 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 537 | */ |
aa7c23a9 | 538 | static |
a90917c3 | 539 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 540 | { |
11b5a3c2 | 541 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 542 | module_put(chan->transport->owner); |
4e3c1b9b | 543 | list_del(&chan->list); |
8070f5c0 | 544 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
545 | kfree(chan); |
546 | } | |
547 | ||
d83004aa JD |
548 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
549 | { | |
550 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
551 | ||
552 | /* Protect the metadata cache with the sessions_mutex. */ | |
553 | mutex_lock(&sessions_mutex); | |
554 | _lttng_channel_destroy(chan); | |
555 | mutex_unlock(&sessions_mutex); | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
558 | ||
559 | static | |
560 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
561 | { | |
562 | stream->finalized = 1; | |
563 | wake_up_interruptible(&stream->read_wait); | |
564 | } | |
565 | ||
e5382b6d MD |
566 | /* |
567 | * Supports event creation while tracing session is active. | |
3c997079 | 568 | * Needs to be called with sessions mutex held. |
e5382b6d | 569 | */ |
3c997079 MD |
570 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
571 | struct lttng_kernel_event *event_param, | |
572 | void *filter, | |
573 | const struct lttng_event_desc *event_desc, | |
574 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 575 | { |
3c997079 | 576 | struct lttng_session *session = chan->session; |
a90917c3 | 577 | struct lttng_event *event; |
3c997079 MD |
578 | const char *event_name; |
579 | struct hlist_head *head; | |
580 | size_t name_len; | |
581 | uint32_t hash; | |
3d084699 | 582 | int ret; |
4e3c1b9b | 583 | |
abc0446a | 584 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 585 | ret = -EMFILE; |
e5382b6d | 586 | goto full; |
abc0446a | 587 | } |
3c997079 MD |
588 | |
589 | switch (itype) { | |
590 | case LTTNG_KERNEL_TRACEPOINT: | |
591 | event_name = event_desc->name; | |
592 | break; | |
593 | case LTTNG_KERNEL_KPROBE: | |
594 | case LTTNG_KERNEL_KRETPROBE: | |
595 | case LTTNG_KERNEL_FUNCTION: | |
596 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 597 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
598 | event_name = event_param->name; |
599 | break; | |
600 | default: | |
601 | WARN_ON_ONCE(1); | |
602 | ret = -EINVAL; | |
603 | goto type_error; | |
604 | } | |
605 | name_len = strlen(event_name); | |
606 | hash = jhash(event_name, name_len, 0); | |
607 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 608 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
609 | WARN_ON_ONCE(!event->desc); |
610 | if (!strncmp(event->desc->name, event_name, | |
611 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
612 | && chan == event->chan) { | |
613 | ret = -EEXIST; | |
614 | goto exist; | |
abc0446a MD |
615 | } |
616 | } | |
3c997079 | 617 | |
11b5a3c2 | 618 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 619 | if (!event) { |
4cf0bf51 | 620 | ret = -ENOMEM; |
4e3c1b9b | 621 | goto cache_error; |
abc0446a | 622 | } |
4e3c1b9b MD |
623 | event->chan = chan; |
624 | event->filter = filter; | |
e5382b6d | 625 | event->id = chan->free_event_id++; |
3c997079 MD |
626 | event->instrumentation = itype; |
627 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 628 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
629 | INIT_LIST_HEAD(&event->enablers_ref_head); |
630 | ||
631 | switch (itype) { | |
ab2277d6 | 632 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
633 | /* Event will be enabled by enabler sync. */ |
634 | event->enabled = 0; | |
635 | event->registered = 0; | |
636 | event->desc = lttng_event_get(event_name); | |
abc0446a | 637 | if (!event->desc) { |
4cf0bf51 | 638 | ret = -ENOENT; |
d3dbe23c | 639 | goto register_error; |
abc0446a | 640 | } |
3c997079 MD |
641 | /* Populate lttng_event structure before event registration. */ |
642 | smp_wmb(); | |
baf20995 | 643 | break; |
ab2277d6 | 644 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
645 | /* |
646 | * Needs to be explicitly enabled after creation, since | |
647 | * we may want to apply filters. | |
648 | */ | |
649 | event->enabled = 0; | |
3c997079 MD |
650 | event->registered = 1; |
651 | /* | |
652 | * Populate lttng_event structure before event | |
653 | * registration. | |
654 | */ | |
655 | smp_wmb(); | |
656 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
657 | event_param->u.kprobe.symbol_name, |
658 | event_param->u.kprobe.offset, | |
659 | event_param->u.kprobe.addr, | |
660 | event); | |
abc0446a | 661 | if (ret) { |
4cf0bf51 | 662 | ret = -EINVAL; |
d6d808f3 | 663 | goto register_error; |
abc0446a | 664 | } |
edeb3137 MD |
665 | ret = try_module_get(event->desc->owner); |
666 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 667 | break; |
7371f44c MD |
668 | case LTTNG_KERNEL_KRETPROBE: |
669 | { | |
a90917c3 | 670 | struct lttng_event *event_return; |
7371f44c MD |
671 | |
672 | /* kretprobe defines 2 events */ | |
a0493bef MD |
673 | /* |
674 | * Needs to be explicitly enabled after creation, since | |
675 | * we may want to apply filters. | |
676 | */ | |
677 | event->enabled = 0; | |
3c997079 | 678 | event->registered = 1; |
7371f44c MD |
679 | event_return = |
680 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 681 | if (!event_return) { |
4cf0bf51 | 682 | ret = -ENOMEM; |
7371f44c | 683 | goto register_error; |
abc0446a | 684 | } |
7371f44c MD |
685 | event_return->chan = chan; |
686 | event_return->filter = filter; | |
687 | event_return->id = chan->free_event_id++; | |
a0493bef | 688 | event_return->enabled = 0; |
3c997079 MD |
689 | event_return->registered = 1; |
690 | event_return->instrumentation = itype; | |
7371f44c | 691 | /* |
a90917c3 | 692 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
693 | */ |
694 | smp_wmb(); | |
3c997079 | 695 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
696 | event_param->u.kretprobe.symbol_name, |
697 | event_param->u.kretprobe.offset, | |
698 | event_param->u.kretprobe.addr, | |
699 | event, event_return); | |
700 | if (ret) { | |
701 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 702 | ret = -EINVAL; |
7371f44c MD |
703 | goto register_error; |
704 | } | |
705 | /* Take 2 refs on the module: one per event. */ | |
706 | ret = try_module_get(event->desc->owner); | |
707 | WARN_ON_ONCE(!ret); | |
708 | ret = try_module_get(event->desc->owner); | |
709 | WARN_ON_ONCE(!ret); | |
a90917c3 | 710 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 711 | event_return); |
abc0446a | 712 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
713 | if (ret) { |
714 | kmem_cache_free(event_cache, event_return); | |
715 | module_put(event->desc->owner); | |
716 | module_put(event->desc->owner); | |
717 | goto statedump_error; | |
718 | } | |
719 | list_add(&event_return->list, &chan->session->events); | |
720 | break; | |
721 | } | |
ab2277d6 | 722 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
723 | /* |
724 | * Needs to be explicitly enabled after creation, since | |
725 | * we may want to apply filters. | |
726 | */ | |
727 | event->enabled = 0; | |
3c997079 MD |
728 | event->registered = 1; |
729 | /* | |
730 | * Populate lttng_event structure before event | |
731 | * registration. | |
732 | */ | |
733 | smp_wmb(); | |
734 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
735 | event_param->u.ftrace.symbol_name, |
736 | event); | |
abc0446a | 737 | if (ret) { |
e0a7a7c4 | 738 | goto register_error; |
abc0446a | 739 | } |
edeb3137 MD |
740 | ret = try_module_get(event->desc->owner); |
741 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 742 | break; |
1ec65de1 | 743 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 744 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
745 | /* |
746 | * Needs to be explicitly enabled after creation, since | |
747 | * we may want to apply filters. | |
748 | */ | |
749 | event->enabled = 0; | |
3c997079 MD |
750 | event->registered = 0; |
751 | event->desc = event_desc; | |
abc0446a | 752 | if (!event->desc) { |
4cf0bf51 | 753 | ret = -EINVAL; |
259b6cb3 | 754 | goto register_error; |
abc0446a | 755 | } |
1ec65de1 | 756 | break; |
baf20995 MD |
757 | default: |
758 | WARN_ON_ONCE(1); | |
4cf0bf51 | 759 | ret = -EINVAL; |
df07930b | 760 | goto register_error; |
baf20995 | 761 | } |
a90917c3 | 762 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
763 | WARN_ON_ONCE(ret > 0); |
764 | if (ret) { | |
c099397a | 765 | goto statedump_error; |
abc0446a | 766 | } |
3c997079 | 767 | hlist_add_head(&event->hlist, head); |
dda6a249 | 768 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
769 | return event; |
770 | ||
c099397a | 771 | statedump_error: |
259b6cb3 | 772 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 773 | register_error: |
11b5a3c2 | 774 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
775 | cache_error: |
776 | exist: | |
3c997079 | 777 | type_error: |
e5382b6d | 778 | full: |
4cf0bf51 | 779 | return ERR_PTR(ret); |
4e3c1b9b MD |
780 | } |
781 | ||
3c997079 MD |
782 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
783 | struct lttng_kernel_event *event_param, | |
784 | void *filter, | |
785 | const struct lttng_event_desc *event_desc, | |
786 | enum lttng_kernel_instrumentation itype) | |
787 | { | |
788 | struct lttng_event *event; | |
789 | ||
790 | mutex_lock(&sessions_mutex); | |
791 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
792 | itype); | |
793 | mutex_unlock(&sessions_mutex); | |
794 | return event; | |
795 | } | |
796 | ||
797 | /* Only used for tracepoints for now. */ | |
798 | static | |
799 | void register_event(struct lttng_event *event) | |
800 | { | |
801 | const struct lttng_event_desc *desc; | |
f127e61e | 802 | int ret = -EINVAL; |
3c997079 | 803 | |
3c997079 MD |
804 | if (event->registered) |
805 | return; | |
4ecb5ad5 | 806 | |
3c997079 | 807 | desc = event->desc; |
4ecb5ad5 MD |
808 | switch (event->instrumentation) { |
809 | case LTTNG_KERNEL_TRACEPOINT: | |
810 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
811 | desc->probe_callback, | |
812 | event); | |
813 | break; | |
814 | case LTTNG_KERNEL_SYSCALL: | |
815 | ret = lttng_syscall_filter_enable(event->chan, | |
816 | desc->name); | |
817 | break; | |
818 | case LTTNG_KERNEL_KPROBE: | |
819 | case LTTNG_KERNEL_KRETPROBE: | |
820 | case LTTNG_KERNEL_FUNCTION: | |
821 | case LTTNG_KERNEL_NOOP: | |
822 | ret = 0; | |
823 | break; | |
824 | default: | |
825 | WARN_ON_ONCE(1); | |
826 | } | |
3c997079 MD |
827 | if (!ret) |
828 | event->registered = 1; | |
829 | } | |
830 | ||
4e3c1b9b MD |
831 | /* |
832 | * Only used internally at session destruction. | |
833 | */ | |
a90917c3 | 834 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 835 | { |
4ecb5ad5 | 836 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
837 | int ret = -EINVAL; |
838 | ||
3c997079 MD |
839 | if (!event->registered) |
840 | return 0; | |
841 | ||
4ecb5ad5 | 842 | desc = event->desc; |
38d024ae | 843 | switch (event->instrumentation) { |
ab2277d6 | 844 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 845 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 846 | event->desc->probe_callback, |
11b5a3c2 | 847 | event); |
baf20995 | 848 | break; |
ab2277d6 | 849 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 850 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
851 | ret = 0; |
852 | break; | |
7371f44c MD |
853 | case LTTNG_KERNEL_KRETPROBE: |
854 | lttng_kretprobes_unregister(event); | |
855 | ret = 0; | |
856 | break; | |
ab2277d6 | 857 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
858 | lttng_ftrace_unregister(event); |
859 | ret = 0; | |
860 | break; | |
33a39a3c | 861 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
862 | ret = lttng_syscall_filter_disable(event->chan, |
863 | desc->name); | |
864 | break; | |
865 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
866 | ret = 0; |
867 | break; | |
baf20995 MD |
868 | default: |
869 | WARN_ON_ONCE(1); | |
870 | } | |
3c997079 MD |
871 | if (!ret) |
872 | event->registered = 0; | |
dda6a249 MD |
873 | return ret; |
874 | } | |
875 | ||
876 | /* | |
877 | * Only used internally at session destruction. | |
878 | */ | |
be066e6c | 879 | static |
a90917c3 | 880 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 881 | { |
edeb3137 MD |
882 | switch (event->instrumentation) { |
883 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 884 | lttng_event_put(event->desc); |
edeb3137 MD |
885 | break; |
886 | case LTTNG_KERNEL_KPROBE: | |
887 | module_put(event->desc->owner); | |
888 | lttng_kprobes_destroy_private(event); | |
889 | break; | |
7371f44c MD |
890 | case LTTNG_KERNEL_KRETPROBE: |
891 | module_put(event->desc->owner); | |
892 | lttng_kretprobes_destroy_private(event); | |
893 | break; | |
edeb3137 MD |
894 | case LTTNG_KERNEL_FUNCTION: |
895 | module_put(event->desc->owner); | |
896 | lttng_ftrace_destroy_private(event); | |
897 | break; | |
259b6cb3 | 898 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 899 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 900 | break; |
edeb3137 MD |
901 | default: |
902 | WARN_ON_ONCE(1); | |
903 | } | |
dda6a249 | 904 | list_del(&event->list); |
8070f5c0 | 905 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 906 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
907 | } |
908 | ||
e0130fab MD |
909 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
910 | { | |
911 | int ret; | |
912 | ||
913 | if (pid < -1) | |
914 | return -EINVAL; | |
915 | mutex_lock(&sessions_mutex); | |
916 | if (pid == -1) { | |
917 | /* track all pids: destroy tracker. */ | |
918 | if (session->pid_tracker) { | |
919 | struct lttng_pid_tracker *lpf; | |
920 | ||
921 | lpf = session->pid_tracker; | |
922 | rcu_assign_pointer(session->pid_tracker, NULL); | |
923 | synchronize_trace(); | |
924 | lttng_pid_tracker_destroy(lpf); | |
925 | } | |
926 | ret = 0; | |
927 | } else { | |
928 | if (!session->pid_tracker) { | |
929 | struct lttng_pid_tracker *lpf; | |
930 | ||
931 | lpf = lttng_pid_tracker_create(); | |
932 | if (!lpf) { | |
933 | ret = -ENOMEM; | |
934 | goto unlock; | |
935 | } | |
936 | ret = lttng_pid_tracker_add(lpf, pid); | |
937 | rcu_assign_pointer(session->pid_tracker, lpf); | |
938 | } else { | |
939 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
940 | } | |
941 | } | |
942 | unlock: | |
943 | mutex_unlock(&sessions_mutex); | |
944 | return ret; | |
945 | } | |
946 | ||
947 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
948 | { | |
949 | int ret; | |
950 | ||
951 | if (pid < -1) | |
952 | return -EINVAL; | |
953 | mutex_lock(&sessions_mutex); | |
954 | if (pid == -1) { | |
955 | /* untrack all pids: replace by empty tracker. */ | |
956 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
957 | struct lttng_pid_tracker *lpf; | |
958 | ||
959 | lpf = lttng_pid_tracker_create(); | |
960 | if (!lpf) { | |
961 | ret = -ENOMEM; | |
962 | goto unlock; | |
963 | } | |
964 | rcu_assign_pointer(session->pid_tracker, lpf); | |
965 | synchronize_trace(); | |
966 | if (old_lpf) | |
967 | lttng_pid_tracker_destroy(old_lpf); | |
968 | ret = 0; | |
969 | } else { | |
970 | if (!session->pid_tracker) { | |
971 | ret = -ENOENT; | |
972 | goto unlock; | |
973 | } | |
974 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
975 | } | |
976 | unlock: | |
977 | mutex_unlock(&sessions_mutex); | |
978 | return ret; | |
979 | } | |
980 | ||
7e6f9ef6 MD |
981 | static |
982 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
983 | { | |
984 | struct lttng_session *session = m->private; | |
985 | struct lttng_pid_tracker *lpf; | |
986 | struct lttng_pid_hash_node *e; | |
987 | int iter = 0, i; | |
988 | ||
989 | mutex_lock(&sessions_mutex); | |
990 | lpf = session->pid_tracker; | |
991 | if (lpf) { | |
992 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
993 | struct hlist_head *head = &lpf->pid_hash[i]; | |
994 | ||
f934e302 | 995 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
996 | if (iter++ >= *pos) |
997 | return e; | |
998 | } | |
999 | } | |
1000 | } else { | |
1001 | /* PID tracker disabled. */ | |
1002 | if (iter >= *pos && iter == 0) { | |
1003 | return session; /* empty tracker */ | |
1004 | } | |
1005 | iter++; | |
1006 | } | |
1007 | /* End of list */ | |
1008 | return NULL; | |
1009 | } | |
1010 | ||
1011 | /* Called with sessions_mutex held. */ | |
1012 | static | |
1013 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1014 | { | |
1015 | struct lttng_session *session = m->private; | |
1016 | struct lttng_pid_tracker *lpf; | |
1017 | struct lttng_pid_hash_node *e; | |
1018 | int iter = 0, i; | |
1019 | ||
1020 | (*ppos)++; | |
1021 | lpf = session->pid_tracker; | |
1022 | if (lpf) { | |
1023 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1024 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1025 | ||
f934e302 | 1026 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1027 | if (iter++ >= *ppos) |
1028 | return e; | |
1029 | } | |
1030 | } | |
1031 | } else { | |
1032 | /* PID tracker disabled. */ | |
1033 | if (iter >= *ppos && iter == 0) | |
1034 | return session; /* empty tracker */ | |
1035 | iter++; | |
1036 | } | |
1037 | ||
1038 | /* End of list */ | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | static | |
1043 | void pid_list_stop(struct seq_file *m, void *p) | |
1044 | { | |
1045 | mutex_unlock(&sessions_mutex); | |
1046 | } | |
1047 | ||
1048 | static | |
1049 | int pid_list_show(struct seq_file *m, void *p) | |
1050 | { | |
1051 | int pid; | |
1052 | ||
1053 | if (p == m->private) { | |
1054 | /* Tracker disabled. */ | |
1055 | pid = -1; | |
1056 | } else { | |
1057 | const struct lttng_pid_hash_node *e = p; | |
1058 | ||
1059 | pid = lttng_pid_tracker_get_node_pid(e); | |
1060 | } | |
1061 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static | |
1066 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1067 | .start = pid_list_start, | |
1068 | .next = pid_list_next, | |
1069 | .stop = pid_list_stop, | |
1070 | .show = pid_list_show, | |
1071 | }; | |
1072 | ||
1073 | static | |
1074 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1075 | { | |
1076 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1077 | } | |
1078 | ||
1079 | static | |
1080 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1081 | { | |
1082 | struct seq_file *m = file->private_data; | |
1083 | struct lttng_session *session = m->private; | |
1084 | int ret; | |
1085 | ||
1086 | WARN_ON_ONCE(!session); | |
1087 | ret = seq_release(inode, file); | |
1088 | if (!ret && session) | |
1089 | fput(session->file); | |
1090 | return ret; | |
1091 | } | |
1092 | ||
1093 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1094 | .owner = THIS_MODULE, | |
1095 | .open = lttng_tracker_pids_list_open, | |
1096 | .read = seq_read, | |
1097 | .llseek = seq_lseek, | |
1098 | .release = lttng_tracker_pids_list_release, | |
1099 | }; | |
1100 | ||
1101 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1102 | { | |
1103 | struct file *tracker_pids_list_file; | |
1104 | struct seq_file *m; | |
1105 | int file_fd, ret; | |
1106 | ||
1107 | file_fd = lttng_get_unused_fd(); | |
1108 | if (file_fd < 0) { | |
1109 | ret = file_fd; | |
1110 | goto fd_error; | |
1111 | } | |
1112 | ||
1113 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1114 | <tng_tracker_pids_list_fops, | |
1115 | NULL, O_RDWR); | |
1116 | if (IS_ERR(tracker_pids_list_file)) { | |
1117 | ret = PTR_ERR(tracker_pids_list_file); | |
1118 | goto file_error; | |
1119 | } | |
9c1f4643 MD |
1120 | if (atomic_long_add_unless(&session->file->f_count, |
1121 | 1, INT_MAX) == INT_MAX) { | |
1122 | goto refcount_error; | |
1123 | } | |
7e6f9ef6 MD |
1124 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1125 | if (ret < 0) | |
1126 | goto open_error; | |
1127 | m = tracker_pids_list_file->private_data; | |
1128 | m->private = session; | |
1129 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1130 | |
1131 | return file_fd; | |
1132 | ||
1133 | open_error: | |
9c1f4643 MD |
1134 | atomic_long_dec(&session->file->f_count); |
1135 | refcount_error: | |
7e6f9ef6 MD |
1136 | fput(tracker_pids_list_file); |
1137 | file_error: | |
1138 | put_unused_fd(file_fd); | |
1139 | fd_error: | |
1140 | return ret; | |
1141 | } | |
1142 | ||
3c997079 MD |
1143 | /* |
1144 | * Enabler management. | |
1145 | */ | |
1146 | static | |
4993071a PP |
1147 | int lttng_match_enabler_star_glob(const char *desc_name, |
1148 | const char *pattern) | |
3c997079 | 1149 | { |
cbc19040 MD |
1150 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1151 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1152 | return 0; |
1153 | return 1; | |
1154 | } | |
1155 | ||
1156 | static | |
4ecb5ad5 MD |
1157 | int lttng_match_enabler_name(const char *desc_name, |
1158 | const char *name) | |
3c997079 | 1159 | { |
4ecb5ad5 | 1160 | if (strcmp(desc_name, name)) |
3c997079 MD |
1161 | return 0; |
1162 | return 1; | |
1163 | } | |
1164 | ||
1165 | static | |
1166 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1167 | struct lttng_enabler *enabler) | |
1168 | { | |
4ecb5ad5 MD |
1169 | const char *desc_name, *enabler_name; |
1170 | ||
1171 | enabler_name = enabler->event_param.name; | |
1172 | switch (enabler->event_param.instrumentation) { | |
1173 | case LTTNG_KERNEL_TRACEPOINT: | |
1174 | desc_name = desc->name; | |
1175 | break; | |
1176 | case LTTNG_KERNEL_SYSCALL: | |
1177 | desc_name = desc->name; | |
1178 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1179 | desc_name += strlen("compat_"); | |
1180 | if (!strncmp(desc_name, "syscall_exit_", | |
1181 | strlen("syscall_exit_"))) { | |
1182 | desc_name += strlen("syscall_exit_"); | |
1183 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1184 | strlen("syscall_entry_"))) { | |
1185 | desc_name += strlen("syscall_entry_"); | |
1186 | } else { | |
1187 | WARN_ON_ONCE(1); | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | break; | |
1191 | default: | |
1192 | WARN_ON_ONCE(1); | |
1193 | return -EINVAL; | |
1194 | } | |
3c997079 | 1195 | switch (enabler->type) { |
4993071a PP |
1196 | case LTTNG_ENABLER_STAR_GLOB: |
1197 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1198 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1199 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1200 | default: |
1201 | return -EINVAL; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | static | |
1206 | int lttng_event_match_enabler(struct lttng_event *event, | |
1207 | struct lttng_enabler *enabler) | |
1208 | { | |
33a39a3c MD |
1209 | if (enabler->event_param.instrumentation != event->instrumentation) |
1210 | return 0; | |
3c997079 MD |
1211 | if (lttng_desc_match_enabler(event->desc, enabler) |
1212 | && event->chan == enabler->chan) | |
1213 | return 1; | |
1214 | else | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static | |
1219 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1220 | struct lttng_enabler *enabler) | |
1221 | { | |
1222 | struct lttng_enabler_ref *enabler_ref; | |
1223 | ||
1224 | list_for_each_entry(enabler_ref, | |
1225 | &event->enablers_ref_head, node) { | |
1226 | if (enabler_ref->ref == enabler) | |
1227 | return enabler_ref; | |
1228 | } | |
1229 | return NULL; | |
1230 | } | |
1231 | ||
3c997079 | 1232 | static |
33a39a3c | 1233 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1234 | { |
1235 | struct lttng_session *session = enabler->chan->session; | |
1236 | struct lttng_probe_desc *probe_desc; | |
1237 | const struct lttng_event_desc *desc; | |
1238 | int i; | |
1239 | struct list_head *probe_list; | |
1240 | ||
1241 | probe_list = lttng_get_probe_list_head(); | |
1242 | /* | |
1243 | * For each probe event, if we find that a probe event matches | |
1244 | * our enabler, create an associated lttng_event if not | |
1245 | * already present. | |
1246 | */ | |
1247 | list_for_each_entry(probe_desc, probe_list, head) { | |
1248 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1249 | int found = 0; | |
1250 | struct hlist_head *head; | |
1251 | const char *event_name; | |
1252 | size_t name_len; | |
1253 | uint32_t hash; | |
1254 | struct lttng_event *event; | |
1255 | ||
1256 | desc = probe_desc->event_desc[i]; | |
1257 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1258 | continue; | |
1259 | event_name = desc->name; | |
1260 | name_len = strlen(event_name); | |
1261 | ||
1262 | /* | |
1263 | * Check if already created. | |
1264 | */ | |
1265 | hash = jhash(event_name, name_len, 0); | |
1266 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1267 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1268 | if (event->desc == desc |
1269 | && event->chan == enabler->chan) | |
1270 | found = 1; | |
1271 | } | |
1272 | if (found) | |
1273 | continue; | |
1274 | ||
1275 | /* | |
1276 | * We need to create an event for this | |
1277 | * event probe. | |
1278 | */ | |
1279 | event = _lttng_event_create(enabler->chan, | |
1280 | NULL, NULL, desc, | |
1281 | LTTNG_KERNEL_TRACEPOINT); | |
1282 | if (!event) { | |
1283 | printk(KERN_INFO "Unable to create event %s\n", | |
1284 | probe_desc->event_desc[i]->name); | |
1285 | } | |
1286 | } | |
1287 | } | |
1288 | } | |
1289 | ||
33a39a3c MD |
1290 | static |
1291 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1292 | { | |
1293 | int ret; | |
1294 | ||
1295 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1296 | WARN_ON_ONCE(ret); | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Create struct lttng_event if it is missing and present in the list of | |
1301 | * tracepoint probes. | |
1302 | * Should be called with sessions mutex held. | |
1303 | */ | |
1304 | static | |
1305 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1306 | { | |
1307 | switch (enabler->event_param.instrumentation) { | |
1308 | case LTTNG_KERNEL_TRACEPOINT: | |
1309 | lttng_create_tracepoint_if_missing(enabler); | |
1310 | break; | |
1311 | case LTTNG_KERNEL_SYSCALL: | |
1312 | lttng_create_syscall_if_missing(enabler); | |
1313 | break; | |
1314 | default: | |
1315 | WARN_ON_ONCE(1); | |
1316 | break; | |
1317 | } | |
1318 | } | |
1319 | ||
3c997079 MD |
1320 | /* |
1321 | * Create events associated with an enabler (if not already present), | |
1322 | * and add backward reference from the event to the enabler. | |
1323 | * Should be called with sessions mutex held. | |
1324 | */ | |
1325 | static | |
1326 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1327 | { | |
1328 | struct lttng_session *session = enabler->chan->session; | |
1329 | struct lttng_event *event; | |
1330 | ||
1331 | /* First ensure that probe events are created for this enabler. */ | |
1332 | lttng_create_event_if_missing(enabler); | |
1333 | ||
1334 | /* For each event matching enabler in session event list. */ | |
1335 | list_for_each_entry(event, &session->events, list) { | |
1336 | struct lttng_enabler_ref *enabler_ref; | |
1337 | ||
1338 | if (!lttng_event_match_enabler(event, enabler)) | |
1339 | continue; | |
1340 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1341 | if (!enabler_ref) { | |
1342 | /* | |
1343 | * If no backward ref, create it. | |
1344 | * Add backward ref from event to enabler. | |
1345 | */ | |
1346 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1347 | if (!enabler_ref) | |
1348 | return -ENOMEM; | |
1349 | enabler_ref->ref = enabler; | |
1350 | list_add(&enabler_ref->node, | |
1351 | &event->enablers_ref_head); | |
1352 | } | |
1353 | ||
f127e61e MD |
1354 | /* |
1355 | * Link filter bytecodes if not linked yet. | |
1356 | */ | |
1357 | lttng_enabler_event_link_bytecode(event, enabler); | |
1358 | ||
3c997079 MD |
1359 | /* TODO: merge event context. */ |
1360 | } | |
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Called at module load: connect the probe on all enablers matching | |
1366 | * this event. | |
1367 | * Called with sessions lock held. | |
1368 | */ | |
1369 | int lttng_fix_pending_events(void) | |
1370 | { | |
1371 | struct lttng_session *session; | |
1372 | ||
1373 | list_for_each_entry(session, &sessions, list) | |
1374 | lttng_session_lazy_sync_enablers(session); | |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1379 | struct lttng_kernel_event *event_param, | |
1380 | struct lttng_channel *chan) | |
1381 | { | |
1382 | struct lttng_enabler *enabler; | |
1383 | ||
1384 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1385 | if (!enabler) | |
1386 | return NULL; | |
1387 | enabler->type = type; | |
07dfc1d0 | 1388 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1389 | memcpy(&enabler->event_param, event_param, |
1390 | sizeof(enabler->event_param)); | |
1391 | enabler->chan = chan; | |
1392 | /* ctx left NULL */ | |
4fd19d8a | 1393 | enabler->enabled = 0; |
3c997079 MD |
1394 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1395 | mutex_lock(&sessions_mutex); | |
1396 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1397 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1398 | mutex_unlock(&sessions_mutex); | |
1399 | return enabler; | |
1400 | } | |
1401 | ||
1402 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1403 | { | |
1404 | mutex_lock(&sessions_mutex); | |
1405 | enabler->enabled = 1; | |
1406 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1407 | mutex_unlock(&sessions_mutex); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1412 | { | |
1413 | mutex_lock(&sessions_mutex); | |
1414 | enabler->enabled = 0; | |
1415 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1416 | mutex_unlock(&sessions_mutex); | |
1417 | return 0; | |
1418 | } | |
1419 | ||
07dfc1d0 MD |
1420 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1421 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1422 | { | |
1423 | struct lttng_filter_bytecode_node *bytecode_node; | |
1424 | uint32_t bytecode_len; | |
1425 | int ret; | |
1426 | ||
1427 | ret = get_user(bytecode_len, &bytecode->len); | |
1428 | if (ret) | |
1429 | return ret; | |
1430 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1431 | GFP_KERNEL); | |
1432 | if (!bytecode_node) | |
1433 | return -ENOMEM; | |
1434 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1435 | sizeof(*bytecode) + bytecode_len); | |
1436 | if (ret) | |
1437 | goto error_free; | |
1438 | bytecode_node->enabler = enabler; | |
1439 | /* Enforce length based on allocated size */ | |
1440 | bytecode_node->bc.len = bytecode_len; | |
1441 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1442 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1443 | return 0; | |
1444 | ||
1445 | error_free: | |
1446 | kfree(bytecode_node); | |
1447 | return ret; | |
1448 | } | |
1449 | ||
3c997079 MD |
1450 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1451 | struct lttng_kernel_context *context_param) | |
1452 | { | |
1453 | return -ENOSYS; | |
1454 | } | |
1455 | ||
1456 | static | |
1457 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1458 | { | |
07dfc1d0 MD |
1459 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1460 | ||
1461 | /* Destroy filter bytecode */ | |
1462 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1463 | &enabler->filter_bytecode_head, node) { | |
1464 | kfree(filter_node); | |
1465 | } | |
1466 | ||
3c997079 MD |
1467 | /* Destroy contexts */ |
1468 | lttng_destroy_context(enabler->ctx); | |
1469 | ||
1470 | list_del(&enabler->node); | |
1471 | kfree(enabler); | |
1472 | } | |
1473 | ||
1474 | /* | |
1475 | * lttng_session_sync_enablers should be called just before starting a | |
1476 | * session. | |
1477 | * Should be called with sessions mutex held. | |
1478 | */ | |
1479 | static | |
1480 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1481 | { | |
1482 | struct lttng_enabler *enabler; | |
1483 | struct lttng_event *event; | |
1484 | ||
1485 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1486 | lttng_enabler_ref_events(enabler); | |
1487 | /* | |
1488 | * For each event, if at least one of its enablers is enabled, | |
1489 | * and its channel and session transient states are enabled, we | |
1490 | * enable the event, else we disable it. | |
1491 | */ | |
1492 | list_for_each_entry(event, &session->events, list) { | |
1493 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1494 | struct lttng_bytecode_runtime *runtime; |
1495 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1496 | |
4ecb5ad5 MD |
1497 | switch (event->instrumentation) { |
1498 | case LTTNG_KERNEL_TRACEPOINT: | |
1499 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1500 | /* Enable events */ |
1501 | list_for_each_entry(enabler_ref, | |
1502 | &event->enablers_ref_head, node) { | |
1503 | if (enabler_ref->ref->enabled) { | |
1504 | enabled = 1; | |
1505 | break; | |
1506 | } | |
1507 | } | |
4ecb5ad5 MD |
1508 | break; |
1509 | default: | |
3c997079 MD |
1510 | /* Not handled with lazy sync. */ |
1511 | continue; | |
1512 | } | |
1513 | /* | |
1514 | * Enabled state is based on union of enablers, with | |
1515 | * intesection of session and channel transient enable | |
1516 | * states. | |
1517 | */ | |
1518 | enabled = enabled && session->tstate && event->chan->tstate; | |
1519 | ||
1520 | ACCESS_ONCE(event->enabled) = enabled; | |
1521 | /* | |
1522 | * Sync tracepoint registration with event enabled | |
1523 | * state. | |
1524 | */ | |
1525 | if (enabled) { | |
1526 | register_event(event); | |
1527 | } else { | |
1528 | _lttng_event_unregister(event); | |
1529 | } | |
07dfc1d0 MD |
1530 | |
1531 | /* Check if has enablers without bytecode enabled */ | |
1532 | list_for_each_entry(enabler_ref, | |
1533 | &event->enablers_ref_head, node) { | |
1534 | if (enabler_ref->ref->enabled | |
1535 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1536 | has_enablers_without_bytecode = 1; | |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | event->has_enablers_without_bytecode = | |
1541 | has_enablers_without_bytecode; | |
1542 | ||
1543 | /* Enable filters */ | |
1544 | list_for_each_entry(runtime, | |
f127e61e | 1545 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1546 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1547 | } |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Apply enablers to session events, adding events to session if need | |
1552 | * be. It is required after each modification applied to an active | |
1553 | * session, and right before session "start". | |
1554 | * "lazy" sync means we only sync if required. | |
1555 | * Should be called with sessions mutex held. | |
1556 | */ | |
1557 | static | |
1558 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1559 | { | |
1560 | /* We can skip if session is not active */ | |
1561 | if (!session->active) | |
1562 | return; | |
1563 | lttng_session_sync_enablers(session); | |
1564 | } | |
1565 | ||
1ec3f75a | 1566 | /* |
d83004aa JD |
1567 | * Serialize at most one packet worth of metadata into a metadata |
1568 | * channel. | |
92d9f5e6 MD |
1569 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1570 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1571 | * allows us to do racy operations such as looking for remaining space left in | |
1572 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1573 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1574 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1575 | * Returns the number of bytes written in the channel, 0 if no data |
1576 | * was written and a negative value on error. | |
1ec3f75a | 1577 | */ |
b3b8072b MD |
1578 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1579 | struct channel *chan) | |
d83004aa JD |
1580 | { |
1581 | struct lib_ring_buffer_ctx ctx; | |
1582 | int ret = 0; | |
1583 | size_t len, reserve_len; | |
1584 | ||
f613e3e6 | 1585 | /* |
92d9f5e6 MD |
1586 | * Ensure we support mutiple get_next / put sequences followed by |
1587 | * put_next. The metadata cache lock protects reading the metadata | |
1588 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1589 | * "flush" operations on the buffer invoked by different processes. | |
1590 | * Moreover, since the metadata cache memory can be reallocated, we | |
1591 | * need to have exclusive access against updates even though we only | |
1592 | * read it. | |
f613e3e6 | 1593 | */ |
92d9f5e6 | 1594 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1595 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1596 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1597 | goto end; |
f613e3e6 | 1598 | |
9616f0bf JD |
1599 | /* Metadata regenerated, change the version. */ |
1600 | if (stream->metadata_cache->version != stream->version) | |
1601 | stream->version = stream->metadata_cache->version; | |
1602 | ||
d83004aa | 1603 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1604 | stream->metadata_in; |
9de2c215 | 1605 | if (!len) |
de23d59d | 1606 | goto end; |
d83004aa | 1607 | reserve_len = min_t(size_t, |
b3b8072b | 1608 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1609 | len); |
b3b8072b | 1610 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1611 | sizeof(char), -1); |
1612 | /* | |
1613 | * If reservation failed, return an error to the caller. | |
1614 | */ | |
b3b8072b | 1615 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1616 | if (ret != 0) { |
1617 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1618 | goto end; | |
1619 | } | |
b3b8072b | 1620 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1621 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1622 | reserve_len); |
b3b8072b | 1623 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1624 | stream->metadata_in += reserve_len; |
d83004aa JD |
1625 | ret = reserve_len; |
1626 | ||
1627 | end: | |
92d9f5e6 | 1628 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1629 | return ret; |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Write the metadata to the metadata cache. | |
1634 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1635 | * The metadata cache lock protects us from concurrent read access from |
1636 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1637 | */ |
a90917c3 | 1638 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1639 | const char *fmt, ...) |
1640 | { | |
c099397a | 1641 | char *str; |
d83004aa | 1642 | size_t len; |
c099397a | 1643 | va_list ap; |
d83004aa | 1644 | struct lttng_metadata_stream *stream; |
c099397a MD |
1645 | |
1646 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1647 | ||
1648 | va_start(ap, fmt); | |
1649 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1650 | va_end(ap); | |
1651 | if (!str) | |
1652 | return -ENOMEM; | |
1653 | ||
1ec3f75a | 1654 | len = strlen(str); |
92d9f5e6 | 1655 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1656 | if (session->metadata_cache->metadata_written + len > |
1657 | session->metadata_cache->cache_alloc) { | |
1658 | char *tmp_cache_realloc; | |
1659 | unsigned int tmp_cache_alloc_size; | |
1660 | ||
1661 | tmp_cache_alloc_size = max_t(unsigned int, | |
1662 | session->metadata_cache->cache_alloc + len, | |
1663 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1664 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1665 | if (!tmp_cache_realloc) |
1666 | goto err; | |
a606b6e8 ML |
1667 | if (session->metadata_cache->data) { |
1668 | memcpy(tmp_cache_realloc, | |
1669 | session->metadata_cache->data, | |
1670 | session->metadata_cache->cache_alloc); | |
1671 | vfree(session->metadata_cache->data); | |
1672 | } | |
1673 | ||
d83004aa JD |
1674 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1675 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1676 | } |
d83004aa JD |
1677 | memcpy(session->metadata_cache->data + |
1678 | session->metadata_cache->metadata_written, | |
1679 | str, len); | |
1680 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1681 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1682 | kfree(str); |
d83004aa JD |
1683 | |
1684 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1685 | wake_up_interruptible(&stream->read_wait); | |
1686 | ||
1687 | return 0; | |
1688 | ||
1689 | err: | |
92d9f5e6 | 1690 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1691 | kfree(str); |
1692 | return -ENOMEM; | |
c099397a MD |
1693 | } |
1694 | ||
f513b2bf MD |
1695 | static |
1696 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1697 | { | |
1698 | size_t i; | |
1699 | ||
1700 | for (i = 0; i < nesting; i++) { | |
1701 | int ret; | |
1702 | ||
1703 | ret = lttng_metadata_printf(session, " "); | |
1704 | if (ret) { | |
1705 | return ret; | |
1706 | } | |
1707 | } | |
1708 | return 0; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * Must be called with sessions_mutex held. | |
1713 | */ | |
1714 | static | |
1715 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1716 | const struct lttng_type *type, | |
1717 | size_t nesting) | |
1718 | { | |
1719 | int ret; | |
1720 | uint32_t i, nr_fields; | |
1721 | ||
1722 | ret = print_tabs(session, nesting); | |
1723 | if (ret) | |
1724 | return ret; | |
1725 | ret = lttng_metadata_printf(session, | |
1726 | "struct {\n"); | |
1727 | if (ret) | |
1728 | return ret; | |
1729 | nr_fields = type->u._struct.nr_fields; | |
1730 | for (i = 0; i < nr_fields; i++) { | |
1731 | const struct lttng_event_field *iter_field; | |
1732 | ||
1733 | iter_field = &type->u._struct.fields[i]; | |
1734 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1735 | if (ret) | |
1736 | return ret; | |
1737 | } | |
1738 | ret = print_tabs(session, nesting); | |
1739 | if (ret) | |
1740 | return ret; | |
1741 | ret = lttng_metadata_printf(session, | |
1742 | "}"); | |
1743 | return ret; | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * Must be called with sessions_mutex held. | |
1748 | */ | |
1749 | static | |
1750 | int _lttng_struct_statedump(struct lttng_session *session, | |
1751 | const struct lttng_event_field *field, | |
1752 | size_t nesting) | |
1753 | { | |
1754 | int ret; | |
1755 | ||
1756 | ret = _lttng_struct_type_statedump(session, | |
1757 | &field->type, nesting); | |
1758 | if (ret) | |
1759 | return ret; | |
1760 | ret = lttng_metadata_printf(session, | |
1761 | "_%s;\n", | |
1762 | field->name); | |
1763 | return ret; | |
1764 | } | |
1765 | ||
65c85aa6 MD |
1766 | /* |
1767 | * Must be called with sessions_mutex held. | |
1768 | */ | |
1769 | static | |
1770 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1771 | const struct lttng_type *type, | |
1772 | size_t nesting) | |
1773 | { | |
1774 | int ret; | |
1775 | uint32_t i, nr_choices; | |
1776 | ||
1777 | ret = print_tabs(session, nesting); | |
1778 | if (ret) | |
1779 | return ret; | |
1780 | ret = lttng_metadata_printf(session, | |
1781 | "variant <_%s> {\n", | |
1782 | type->u.variant.tag_name); | |
1783 | if (ret) | |
1784 | return ret; | |
1785 | nr_choices = type->u.variant.nr_choices; | |
1786 | for (i = 0; i < nr_choices; i++) { | |
1787 | const struct lttng_event_field *iter_field; | |
1788 | ||
1789 | iter_field = &type->u.variant.choices[i]; | |
1790 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1791 | if (ret) | |
1792 | return ret; | |
1793 | } | |
1794 | ret = print_tabs(session, nesting); | |
1795 | if (ret) | |
1796 | return ret; | |
1797 | ret = lttng_metadata_printf(session, | |
1798 | "}"); | |
1799 | return ret; | |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * Must be called with sessions_mutex held. | |
1804 | */ | |
1805 | static | |
1806 | int _lttng_variant_statedump(struct lttng_session *session, | |
1807 | const struct lttng_event_field *field, | |
1808 | size_t nesting) | |
1809 | { | |
1810 | int ret; | |
1811 | ||
1812 | ret = _lttng_variant_type_statedump(session, | |
1813 | &field->type, nesting); | |
1814 | if (ret) | |
1815 | return ret; | |
1816 | ret = lttng_metadata_printf(session, | |
1817 | "_%s;\n", | |
1818 | field->name); | |
1819 | return ret; | |
1820 | } | |
1821 | ||
f513b2bf MD |
1822 | /* |
1823 | * Must be called with sessions_mutex held. | |
1824 | */ | |
1825 | static | |
1826 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1827 | const struct lttng_event_field *field, | |
1828 | size_t nesting) | |
1829 | { | |
1830 | int ret; | |
1831 | const struct lttng_type *elem_type; | |
1832 | ||
65c85aa6 | 1833 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1834 | elem_type = field->type.u.array_compound.elem_type; |
1835 | switch (elem_type->atype) { | |
1836 | case atype_struct: | |
1837 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1838 | if (ret) | |
1839 | return ret; | |
1840 | break; | |
65c85aa6 MD |
1841 | case atype_variant: |
1842 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1843 | if (ret) | |
1844 | return ret; | |
1845 | break; | |
f513b2bf MD |
1846 | default: |
1847 | return -EINVAL; | |
1848 | } | |
1849 | ret = lttng_metadata_printf(session, | |
1850 | " _%s[%u];\n", | |
1851 | field->name, | |
1852 | field->type.u.array_compound.length); | |
1853 | return ret; | |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Must be called with sessions_mutex held. | |
1858 | */ | |
1859 | static | |
1860 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1861 | const struct lttng_event_field *field, | |
1862 | size_t nesting) | |
1863 | { | |
1864 | int ret; | |
1865 | const char *length_name; | |
1866 | const struct lttng_type *elem_type; | |
1867 | ||
1868 | length_name = field->type.u.sequence_compound.length_name; | |
1869 | ||
65c85aa6 | 1870 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1871 | elem_type = field->type.u.sequence_compound.elem_type; |
1872 | switch (elem_type->atype) { | |
1873 | case atype_struct: | |
1874 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1875 | if (ret) | |
1876 | return ret; | |
1877 | break; | |
65c85aa6 MD |
1878 | case atype_variant: |
1879 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1880 | if (ret) | |
1881 | return ret; | |
1882 | break; | |
f513b2bf MD |
1883 | default: |
1884 | return -EINVAL; | |
1885 | } | |
1886 | ret = lttng_metadata_printf(session, | |
1887 | " _%s[ _%s ];\n", | |
1888 | field->name, | |
1889 | length_name); | |
1890 | return ret; | |
1891 | } | |
1892 | ||
141ddf28 MD |
1893 | /* |
1894 | * Must be called with sessions_mutex held. | |
1895 | */ | |
1896 | static | |
1897 | int _lttng_enum_statedump(struct lttng_session *session, | |
1898 | const struct lttng_event_field *field, | |
1899 | size_t nesting) | |
1900 | { | |
1901 | const struct lttng_enum_desc *enum_desc; | |
1902 | const struct lttng_integer_type *container_type; | |
1903 | int ret; | |
1904 | unsigned int i, nr_entries; | |
1905 | ||
1906 | enum_desc = field->type.u.basic.enumeration.desc; | |
1907 | container_type = &field->type.u.basic.enumeration.container_type; | |
1908 | nr_entries = enum_desc->nr_entries; | |
1909 | ||
1910 | ret = print_tabs(session, nesting); | |
1911 | if (ret) | |
1912 | goto end; | |
1913 | ret = lttng_metadata_printf(session, | |
578e68ec | 1914 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1915 | container_type->size, |
1916 | container_type->alignment, | |
1917 | container_type->signedness, | |
1918 | (container_type->encoding == lttng_encode_none) | |
1919 | ? "none" | |
1920 | : (container_type->encoding == lttng_encode_UTF8) | |
1921 | ? "UTF8" | |
1922 | : "ASCII", | |
578e68ec GB |
1923 | container_type->base, |
1924 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1925 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1926 | #else | |
1927 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1928 | #endif | |
1929 | ); | |
141ddf28 MD |
1930 | if (ret) |
1931 | goto end; | |
1932 | /* Dump all entries */ | |
1933 | for (i = 0; i < nr_entries; i++) { | |
1934 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1935 | int j, len; | |
1936 | ||
1937 | ret = print_tabs(session, nesting + 1); | |
1938 | if (ret) | |
1939 | goto end; | |
1940 | ret = lttng_metadata_printf(session, | |
1941 | "\""); | |
1942 | if (ret) | |
1943 | goto end; | |
1944 | len = strlen(entry->string); | |
1945 | /* Escape the character '"' */ | |
1946 | for (j = 0; j < len; j++) { | |
1947 | char c = entry->string[j]; | |
1948 | ||
1949 | switch (c) { | |
1950 | case '"': | |
1951 | ret = lttng_metadata_printf(session, | |
1952 | "\\\""); | |
1953 | break; | |
1954 | case '\\': | |
1955 | ret = lttng_metadata_printf(session, | |
1956 | "\\\\"); | |
1957 | break; | |
1958 | default: | |
1959 | ret = lttng_metadata_printf(session, | |
1960 | "%c", c); | |
1961 | break; | |
1962 | } | |
1963 | if (ret) | |
1964 | goto end; | |
1965 | } | |
08ad1061 PP |
1966 | ret = lttng_metadata_printf(session, "\""); |
1967 | if (ret) | |
1968 | goto end; | |
1969 | ||
1970 | if (entry->options.is_auto) { | |
1971 | ret = lttng_metadata_printf(session, ",\n"); | |
1972 | if (ret) | |
1973 | goto end; | |
141ddf28 | 1974 | } else { |
7c559490 MD |
1975 | ret = lttng_metadata_printf(session, |
1976 | " = "); | |
1977 | if (ret) | |
1978 | goto end; | |
1979 | if (entry->start.signedness) | |
141ddf28 | 1980 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1981 | "%lld", (long long) entry->start.value); |
1982 | else | |
1983 | ret = lttng_metadata_printf(session, | |
1984 | "%llu", entry->start.value); | |
1985 | if (ret) | |
1986 | goto end; | |
1987 | if (entry->start.signedness == entry->end.signedness && | |
1988 | entry->start.value | |
1989 | == entry->end.value) { | |
141ddf28 | 1990 | ret = lttng_metadata_printf(session, |
7c559490 MD |
1991 | ",\n"); |
1992 | } else { | |
1993 | if (entry->end.signedness) { | |
1994 | ret = lttng_metadata_printf(session, | |
1995 | " ... %lld,\n", | |
1996 | (long long) entry->end.value); | |
1997 | } else { | |
1998 | ret = lttng_metadata_printf(session, | |
1999 | " ... %llu,\n", | |
2000 | entry->end.value); | |
2001 | } | |
141ddf28 | 2002 | } |
7c559490 MD |
2003 | if (ret) |
2004 | goto end; | |
141ddf28 | 2005 | } |
141ddf28 MD |
2006 | } |
2007 | ret = print_tabs(session, nesting); | |
2008 | if (ret) | |
2009 | goto end; | |
2010 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2011 | field->name); | |
2012 | end: | |
2013 | return ret; | |
2014 | } | |
2015 | ||
d83004aa JD |
2016 | /* |
2017 | * Must be called with sessions_mutex held. | |
2018 | */ | |
c099397a | 2019 | static |
a90917c3 | 2020 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2021 | const struct lttng_event_field *field, |
2022 | size_t nesting) | |
c099397a | 2023 | { |
c099397a | 2024 | int ret = 0; |
c099397a | 2025 | |
8070f5c0 MD |
2026 | switch (field->type.atype) { |
2027 | case atype_integer: | |
f513b2bf MD |
2028 | ret = print_tabs(session, nesting); |
2029 | if (ret) | |
2030 | return ret; | |
8070f5c0 | 2031 | ret = lttng_metadata_printf(session, |
f513b2bf | 2032 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2033 | field->type.u.basic.integer.size, |
2034 | field->type.u.basic.integer.alignment, | |
2035 | field->type.u.basic.integer.signedness, | |
2036 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2037 | ? "none" | |
2038 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2039 | ? "UTF8" | |
2040 | : "ASCII", | |
2041 | field->type.u.basic.integer.base, | |
5214fa50 | 2042 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2043 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2044 | #else |
8070f5c0 | 2045 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2046 | #endif |
8070f5c0 MD |
2047 | field->name); |
2048 | break; | |
2049 | case atype_enum: | |
141ddf28 | 2050 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2051 | break; |
2052 | case atype_array: | |
2053 | { | |
2054 | const struct lttng_basic_type *elem_type; | |
2055 | ||
2056 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2057 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2058 | ret = print_tabs(session, nesting); |
2059 | if (ret) | |
2060 | return ret; | |
43803cf2 | 2061 | ret = lttng_metadata_printf(session, |
f513b2bf | 2062 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2063 | field->type.u.array.elem_alignment * CHAR_BIT, |
2064 | field->name); | |
2065 | if (ret) | |
2066 | return ret; | |
2067 | } | |
f513b2bf MD |
2068 | ret = print_tabs(session, nesting); |
2069 | if (ret) | |
2070 | return ret; | |
8070f5c0 | 2071 | ret = lttng_metadata_printf(session, |
f513b2bf | 2072 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2073 | elem_type->u.basic.integer.size, |
2074 | elem_type->u.basic.integer.alignment, | |
2075 | elem_type->u.basic.integer.signedness, | |
2076 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2077 | ? "none" | |
2078 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2079 | ? "UTF8" | |
2080 | : "ASCII", | |
2081 | elem_type->u.basic.integer.base, | |
5214fa50 | 2082 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2083 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2084 | #else |
8070f5c0 | 2085 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2086 | #endif |
8070f5c0 MD |
2087 | field->name, field->type.u.array.length); |
2088 | break; | |
2089 | } | |
2090 | case atype_sequence: | |
2091 | { | |
2092 | const struct lttng_basic_type *elem_type; | |
2093 | const struct lttng_basic_type *length_type; | |
2094 | ||
2095 | elem_type = &field->type.u.sequence.elem_type; | |
2096 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2097 | ret = print_tabs(session, nesting); |
2098 | if (ret) | |
2099 | return ret; | |
8070f5c0 | 2100 | ret = lttng_metadata_printf(session, |
f513b2bf | 2101 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2102 | length_type->u.basic.integer.size, |
32257272 | 2103 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2104 | length_type->u.basic.integer.signedness, |
2105 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2106 | ? "none" | |
0635cdd4 | 2107 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2108 | ? "UTF8" |
0635cdd4 | 2109 | : "ASCII"), |
8070f5c0 | 2110 | length_type->u.basic.integer.base, |
5214fa50 | 2111 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2112 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2113 | #else |
0635cdd4 | 2114 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2115 | #endif |
27d2368e MD |
2116 | field->name); |
2117 | if (ret) | |
2118 | return ret; | |
2119 | ||
43803cf2 | 2120 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2121 | ret = print_tabs(session, nesting); |
2122 | if (ret) | |
2123 | return ret; | |
43803cf2 | 2124 | ret = lttng_metadata_printf(session, |
f513b2bf | 2125 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2126 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2127 | field->name); | |
2128 | if (ret) | |
2129 | return ret; | |
2130 | } | |
f513b2bf MD |
2131 | ret = print_tabs(session, nesting); |
2132 | if (ret) | |
2133 | return ret; | |
27d2368e | 2134 | ret = lttng_metadata_printf(session, |
f513b2bf | 2135 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2136 | elem_type->u.basic.integer.size, |
32257272 | 2137 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2138 | elem_type->u.basic.integer.signedness, |
2139 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2140 | ? "none" | |
0635cdd4 | 2141 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2142 | ? "UTF8" |
0635cdd4 | 2143 | : "ASCII"), |
8070f5c0 | 2144 | elem_type->u.basic.integer.base, |
5214fa50 | 2145 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2146 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2147 | #else |
8070f5c0 | 2148 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2149 | #endif |
8070f5c0 | 2150 | field->name, |
27d2368e | 2151 | field->name); |
8070f5c0 MD |
2152 | break; |
2153 | } | |
c099397a | 2154 | |
8070f5c0 MD |
2155 | case atype_string: |
2156 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2157 | ret = print_tabs(session, nesting); |
2158 | if (ret) | |
2159 | return ret; | |
8070f5c0 | 2160 | ret = lttng_metadata_printf(session, |
f513b2bf | 2161 | "string%s _%s;\n", |
8070f5c0 MD |
2162 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2163 | " { encoding = ASCII; }" : "", | |
2164 | field->name); | |
2165 | break; | |
f513b2bf MD |
2166 | case atype_struct: |
2167 | ret = _lttng_struct_statedump(session, field, nesting); | |
2168 | break; | |
2169 | case atype_array_compound: | |
2170 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2171 | break; | |
2172 | case atype_sequence_compound: | |
2173 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2174 | break; | |
65c85aa6 MD |
2175 | case atype_variant: |
2176 | ret = _lttng_variant_statedump(session, field, nesting); | |
2177 | break; | |
f513b2bf | 2178 | |
8070f5c0 MD |
2179 | default: |
2180 | WARN_ON_ONCE(1); | |
2181 | return -EINVAL; | |
2182 | } | |
2183 | return ret; | |
2184 | } | |
2185 | ||
2186 | static | |
a90917c3 | 2187 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2188 | struct lttng_ctx *ctx) |
2189 | { | |
2190 | int ret = 0; | |
2191 | int i; | |
2192 | ||
2193 | if (!ctx) | |
2194 | return 0; | |
2195 | for (i = 0; i < ctx->nr_fields; i++) { | |
2196 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2197 | ||
f513b2bf | 2198 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2199 | if (ret) |
2200 | return ret; | |
2201 | } | |
2202 | return ret; | |
2203 | } | |
2204 | ||
2205 | static | |
a90917c3 MD |
2206 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2207 | struct lttng_event *event) | |
8070f5c0 MD |
2208 | { |
2209 | const struct lttng_event_desc *desc = event->desc; | |
2210 | int ret = 0; | |
2211 | int i; | |
2212 | ||
2213 | for (i = 0; i < desc->nr_fields; i++) { | |
2214 | const struct lttng_event_field *field = &desc->fields[i]; | |
2215 | ||
f513b2bf | 2216 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2217 | if (ret) |
2218 | return ret; | |
c099397a MD |
2219 | } |
2220 | return ret; | |
2221 | } | |
2222 | ||
d83004aa JD |
2223 | /* |
2224 | * Must be called with sessions_mutex held. | |
2225 | */ | |
c099397a | 2226 | static |
a90917c3 MD |
2227 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2228 | struct lttng_channel *chan, | |
2229 | struct lttng_event *event) | |
c099397a MD |
2230 | { |
2231 | int ret = 0; | |
2232 | ||
2233 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2234 | return 0; | |
d83004aa | 2235 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2236 | return 0; |
2237 | ||
2238 | ret = lttng_metadata_printf(session, | |
2239 | "event {\n" | |
ae734547 | 2240 | " name = \"%s\";\n" |
c099397a | 2241 | " id = %u;\n" |
b9074a1b | 2242 | " stream_id = %u;\n", |
c099397a MD |
2243 | event->desc->name, |
2244 | event->id, | |
2245 | event->chan->id); | |
2246 | if (ret) | |
2247 | goto end; | |
2248 | ||
b9074a1b MD |
2249 | if (event->ctx) { |
2250 | ret = lttng_metadata_printf(session, | |
2251 | " context := struct {\n"); | |
2252 | if (ret) | |
2253 | goto end; | |
2254 | } | |
a90917c3 | 2255 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2256 | if (ret) |
2257 | goto end; | |
b9074a1b MD |
2258 | if (event->ctx) { |
2259 | ret = lttng_metadata_printf(session, | |
2260 | " };\n"); | |
2261 | if (ret) | |
2262 | goto end; | |
2263 | } | |
8070f5c0 MD |
2264 | |
2265 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2266 | " fields := struct {\n" |
2267 | ); | |
2268 | if (ret) | |
2269 | goto end; | |
2270 | ||
a90917c3 | 2271 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2272 | if (ret) |
2273 | goto end; | |
2274 | ||
2275 | /* | |
2276 | * LTTng space reservation can only reserve multiples of the | |
2277 | * byte size. | |
2278 | */ | |
2279 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2280 | " };\n" |
2281 | "};\n\n"); | |
c099397a MD |
2282 | if (ret) |
2283 | goto end; | |
2284 | ||
c099397a MD |
2285 | event->metadata_dumped = 1; |
2286 | end: | |
2287 | return ret; | |
2288 | ||
2289 | } | |
2290 | ||
d83004aa JD |
2291 | /* |
2292 | * Must be called with sessions_mutex held. | |
2293 | */ | |
c099397a | 2294 | static |
a90917c3 MD |
2295 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2296 | struct lttng_channel *chan) | |
c099397a MD |
2297 | { |
2298 | int ret = 0; | |
2299 | ||
2300 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
2301 | return 0; | |
d83004aa JD |
2302 | |
2303 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2304 | return 0; |
2305 | ||
2306 | WARN_ON_ONCE(!chan->header_type); | |
2307 | ret = lttng_metadata_printf(session, | |
2308 | "stream {\n" | |
2309 | " id = %u;\n" | |
9115fbdc | 2310 | " event.header := %s;\n" |
b9074a1b | 2311 | " packet.context := struct packet_context;\n", |
c099397a MD |
2312 | chan->id, |
2313 | chan->header_type == 1 ? "struct event_header_compact" : | |
2314 | "struct event_header_large"); | |
2315 | if (ret) | |
2316 | goto end; | |
2317 | ||
b9074a1b MD |
2318 | if (chan->ctx) { |
2319 | ret = lttng_metadata_printf(session, | |
2320 | " event.context := struct {\n"); | |
2321 | if (ret) | |
2322 | goto end; | |
2323 | } | |
a90917c3 | 2324 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2325 | if (ret) |
2326 | goto end; | |
b9074a1b MD |
2327 | if (chan->ctx) { |
2328 | ret = lttng_metadata_printf(session, | |
2329 | " };\n"); | |
2330 | if (ret) | |
2331 | goto end; | |
2332 | } | |
8070f5c0 MD |
2333 | |
2334 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2335 | "};\n\n"); |
8070f5c0 | 2336 | |
c099397a MD |
2337 | chan->metadata_dumped = 1; |
2338 | end: | |
2339 | return ret; | |
2340 | } | |
2341 | ||
d83004aa JD |
2342 | /* |
2343 | * Must be called with sessions_mutex held. | |
2344 | */ | |
9115fbdc | 2345 | static |
a90917c3 | 2346 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2347 | { |
2348 | return lttng_metadata_printf(session, | |
2349 | "struct packet_context {\n" | |
a3ccff4f MD |
2350 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2351 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2352 | " uint64_t content_size;\n" |
2353 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2354 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2355 | " unsigned long events_discarded;\n" |
9115fbdc | 2356 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2357 | "};\n\n" |
9115fbdc MD |
2358 | ); |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Compact header: | |
2363 | * id: range: 0 - 30. | |
2364 | * id 31 is reserved to indicate an extended header. | |
2365 | * | |
2366 | * Large header: | |
2367 | * id: range: 0 - 65534. | |
2368 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2369 | * |
2370 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2371 | */ |
2372 | static | |
a90917c3 | 2373 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2374 | { |
2375 | return lttng_metadata_printf(session, | |
2376 | "struct event_header_compact {\n" | |
2377 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2378 | " variant <id> {\n" | |
2379 | " struct {\n" | |
a3ccff4f | 2380 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2381 | " } compact;\n" |
2382 | " struct {\n" | |
2383 | " uint32_t id;\n" | |
a3ccff4f | 2384 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2385 | " } extended;\n" |
2386 | " } v;\n" | |
2387 | "} align(%u);\n" | |
2388 | "\n" | |
2389 | "struct event_header_large {\n" | |
2390 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2391 | " variant <id> {\n" | |
2392 | " struct {\n" | |
a3ccff4f | 2393 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2394 | " } compact;\n" |
2395 | " struct {\n" | |
2396 | " uint32_t id;\n" | |
a3ccff4f | 2397 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2398 | " } extended;\n" |
2399 | " } v;\n" | |
2400 | "} align(%u);\n\n", | |
a90917c3 MD |
2401 | lttng_alignof(uint32_t) * CHAR_BIT, |
2402 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2403 | ); |
2404 | } | |
2405 | ||
a3ccff4f MD |
2406 | /* |
2407 | * Approximation of NTP time of day to clock monotonic correlation, | |
2408 | * taken at start of trace. | |
2409 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2410 | * in future versions. | |
5283350b MD |
2411 | * This function may return a negative offset. It may happen if the |
2412 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2413 | */ |
2414 | static | |
8967b2a3 | 2415 | int64_t measure_clock_offset(void) |
a3ccff4f | 2416 | { |
dcb93448 | 2417 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2418 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2419 | int64_t offset; |
a3ccff4f MD |
2420 | struct timespec rts = { 0, 0 }; |
2421 | unsigned long flags; | |
2422 | ||
2423 | /* Disable interrupts to increase correlation precision. */ | |
2424 | local_irq_save(flags); | |
2425 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2426 | getnstimeofday(&rts); |
a3ccff4f MD |
2427 | monotonic[1] = trace_clock_read64(); |
2428 | local_irq_restore(flags); | |
2429 | ||
dcb93448 | 2430 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2431 | realtime = (uint64_t) rts.tv_sec * tcf; |
2432 | if (tcf == NSEC_PER_SEC) { | |
2433 | realtime += rts.tv_nsec; | |
2434 | } else { | |
2435 | uint64_t n = rts.tv_nsec * tcf; | |
2436 | ||
2437 | do_div(n, NSEC_PER_SEC); | |
2438 | realtime += n; | |
2439 | } | |
dcb93448 | 2440 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2441 | return offset; |
2442 | } | |
2443 | ||
c099397a MD |
2444 | /* |
2445 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2446 | * Must be called with sessions_mutex held. |
c099397a MD |
2447 | */ |
2448 | static | |
a90917c3 | 2449 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2450 | { |
30bdb6e4 | 2451 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2452 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2453 | struct lttng_channel *chan; |
2454 | struct lttng_event *event; | |
c099397a MD |
2455 | int ret = 0; |
2456 | ||
2457 | if (!ACCESS_ONCE(session->active)) | |
2458 | return 0; | |
2459 | if (session->metadata_dumped) | |
2460 | goto skip_session; | |
c099397a | 2461 | |
d793d5e1 | 2462 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2463 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2464 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2465 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2466 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2467 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2468 | |
2469 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2470 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2471 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2472 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2473 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2474 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2475 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2476 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2477 | "\n" |
2478 | "trace {\n" | |
2479 | " major = %u;\n" | |
2480 | " minor = %u;\n" | |
30bdb6e4 | 2481 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2482 | " byte_order = %s;\n" |
2483 | " packet.header := struct {\n" | |
2484 | " uint32_t magic;\n" | |
1ec3f75a | 2485 | " uint8_t uuid[16];\n" |
d793d5e1 | 2486 | " uint32_t stream_id;\n" |
5594698f | 2487 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2488 | " };\n" |
d793d5e1 | 2489 | "};\n\n", |
a90917c3 MD |
2490 | lttng_alignof(uint8_t) * CHAR_BIT, |
2491 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2492 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2493 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2494 | sizeof(unsigned long) * CHAR_BIT, |
2495 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2496 | CTF_SPEC_MAJOR, |
2497 | CTF_SPEC_MINOR, | |
d793d5e1 | 2498 | uuid_s, |
5214fa50 | 2499 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2500 | "be" |
2501 | #else | |
2502 | "le" | |
2503 | #endif | |
2504 | ); | |
2505 | if (ret) | |
2506 | goto end; | |
2507 | ||
99dc9597 MD |
2508 | ret = lttng_metadata_printf(session, |
2509 | "env {\n" | |
a6058143 | 2510 | " hostname = \"%s\";\n" |
c6c9e10f | 2511 | " domain = \"kernel\";\n" |
99dc9597 | 2512 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2513 | " kernel_release = \"%s\";\n" |
2514 | " kernel_version = \"%s\";\n" | |
2515 | " tracer_name = \"lttng-modules\";\n" | |
2516 | " tracer_major = %d;\n" | |
2517 | " tracer_minor = %d;\n" | |
2518 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2519 | "};\n\n", |
3d0d43db | 2520 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2521 | utsname()->sysname, |
2522 | utsname()->release, | |
c6c9e10f MD |
2523 | utsname()->version, |
2524 | LTTNG_MODULES_MAJOR_VERSION, | |
2525 | LTTNG_MODULES_MINOR_VERSION, | |
2526 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2527 | ); |
2528 | if (ret) | |
2529 | goto end; | |
2530 | ||
a3ccff4f MD |
2531 | ret = lttng_metadata_printf(session, |
2532 | "clock {\n" | |
2754583e MD |
2533 | " name = \"%s\";\n", |
2534 | trace_clock_name() | |
a82c63f1 MD |
2535 | ); |
2536 | if (ret) | |
2537 | goto end; | |
2538 | ||
2539 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2540 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2541 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2542 | clock_uuid_s |
2543 | ); | |
2544 | if (ret) | |
2545 | goto end; | |
2546 | } | |
2547 | ||
2548 | ret = lttng_metadata_printf(session, | |
2754583e | 2549 | " description = \"%s\";\n" |
a3ccff4f MD |
2550 | " freq = %llu; /* Frequency, in Hz */\n" |
2551 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2552 | " offset = %lld;\n" |
a3ccff4f | 2553 | "};\n\n", |
2754583e | 2554 | trace_clock_description(), |
a3ccff4f | 2555 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2556 | (long long) measure_clock_offset() |
a3ccff4f MD |
2557 | ); |
2558 | if (ret) | |
2559 | goto end; | |
2560 | ||
2561 | ret = lttng_metadata_printf(session, | |
2562 | "typealias integer {\n" | |
2563 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2564 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2565 | "} := uint27_clock_monotonic_t;\n" |
2566 | "\n" | |
2567 | "typealias integer {\n" | |
2568 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2569 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2570 | "} := uint32_clock_monotonic_t;\n" |
2571 | "\n" | |
2572 | "typealias integer {\n" | |
2573 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2574 | " map = clock.%s.value;\n" |
a3ccff4f | 2575 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2576 | trace_clock_name(), |
a3ccff4f | 2577 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2578 | trace_clock_name(), |
2579 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2580 | trace_clock_name() | |
a3ccff4f MD |
2581 | ); |
2582 | if (ret) | |
2583 | goto end; | |
2584 | ||
a90917c3 | 2585 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2586 | if (ret) |
2587 | goto end; | |
2588 | ||
a90917c3 | 2589 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2590 | if (ret) |
2591 | goto end; | |
2592 | ||
c099397a MD |
2593 | skip_session: |
2594 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2595 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2596 | if (ret) |
2597 | goto end; | |
2598 | } | |
2599 | ||
2600 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2601 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2602 | if (ret) |
2603 | goto end; | |
2604 | } | |
2605 | session->metadata_dumped = 1; | |
2606 | end: | |
2607 | return ret; | |
2608 | } | |
2609 | ||
c0e31d2e | 2610 | /** |
a90917c3 | 2611 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2612 | * @transport: transport structure |
2613 | * | |
2614 | * Registers a transport which can be used as output to extract the data out of | |
2615 | * LTTng. The module calling this registration function must ensure that no | |
2616 | * trap-inducing code will be executed by the transport functions. E.g. | |
2617 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2618 | * is made visible to the transport function. This registration acts as a | |
2619 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2620 | * after its registration must it synchronize the TLBs. | |
2621 | */ | |
a90917c3 | 2622 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2623 | { |
2624 | /* | |
2625 | * Make sure no page fault can be triggered by the module about to be | |
2626 | * registered. We deal with this here so we don't have to call | |
2627 | * vmalloc_sync_all() in each module's init. | |
2628 | */ | |
6d2a620c | 2629 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2630 | |
2631 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2632 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2633 | mutex_unlock(&sessions_mutex); |
2634 | } | |
a90917c3 | 2635 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2636 | |
2637 | /** | |
a90917c3 | 2638 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2639 | * @transport: transport structure |
2640 | */ | |
a90917c3 | 2641 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2642 | { |
2643 | mutex_lock(&sessions_mutex); | |
2644 | list_del(&transport->node); | |
2645 | mutex_unlock(&sessions_mutex); | |
2646 | } | |
a90917c3 | 2647 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2648 | |
1e367326 MD |
2649 | #if (defined(CONFIG_HOTPLUG_CPU) && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))) |
2650 | ||
2651 | enum cpuhp_state lttng_hp_prepare; | |
2652 | enum cpuhp_state lttng_hp_online; | |
2653 | ||
2654 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2655 | { | |
2656 | struct lttng_cpuhp_node *lttng_node; | |
2657 | ||
2658 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2659 | switch (lttng_node->component) { | |
2660 | case LTTNG_RING_BUFFER_FRONTEND: | |
2661 | return 0; | |
2662 | case LTTNG_RING_BUFFER_BACKEND: | |
2663 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2664 | case LTTNG_RING_BUFFER_ITER: | |
2665 | return 0; | |
2666 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2667 | return 0; | |
2668 | default: | |
2669 | return -EINVAL; | |
2670 | } | |
2671 | } | |
2672 | ||
2673 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2674 | { | |
2675 | struct lttng_cpuhp_node *lttng_node; | |
2676 | ||
2677 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2678 | switch (lttng_node->component) { | |
2679 | case LTTNG_RING_BUFFER_FRONTEND: | |
2680 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2681 | case LTTNG_RING_BUFFER_BACKEND: | |
2682 | return 0; | |
2683 | case LTTNG_RING_BUFFER_ITER: | |
2684 | return 0; | |
2685 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2686 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2687 | default: | |
2688 | return -EINVAL; | |
2689 | } | |
2690 | } | |
2691 | ||
2692 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2693 | { | |
2694 | struct lttng_cpuhp_node *lttng_node; | |
2695 | ||
2696 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2697 | switch (lttng_node->component) { | |
2698 | case LTTNG_RING_BUFFER_FRONTEND: | |
2699 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2700 | case LTTNG_RING_BUFFER_BACKEND: | |
2701 | return 0; | |
2702 | case LTTNG_RING_BUFFER_ITER: | |
2703 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2704 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2705 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2706 | default: | |
2707 | return -EINVAL; | |
2708 | } | |
2709 | } | |
2710 | ||
2711 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2712 | { | |
2713 | struct lttng_cpuhp_node *lttng_node; | |
2714 | ||
2715 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2716 | switch (lttng_node->component) { | |
2717 | case LTTNG_RING_BUFFER_FRONTEND: | |
2718 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2719 | case LTTNG_RING_BUFFER_BACKEND: | |
2720 | return 0; | |
2721 | case LTTNG_RING_BUFFER_ITER: | |
2722 | return 0; | |
2723 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2724 | return 0; | |
2725 | default: | |
2726 | return -EINVAL; | |
2727 | } | |
2728 | } | |
2729 | ||
2730 | static int __init lttng_init_cpu_hotplug(void) | |
2731 | { | |
2732 | int ret; | |
2733 | ||
2734 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2735 | lttng_hotplug_prepare, | |
2736 | lttng_hotplug_dead); | |
2737 | if (ret < 0) { | |
2738 | return ret; | |
2739 | } | |
2740 | lttng_hp_prepare = ret; | |
2741 | lttng_rb_set_hp_prepare(ret); | |
2742 | ||
2743 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2744 | lttng_hotplug_online, | |
2745 | lttng_hotplug_offline); | |
2746 | if (ret < 0) { | |
2747 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2748 | lttng_hp_prepare = 0; | |
2749 | return ret; | |
2750 | } | |
2751 | lttng_hp_online = ret; | |
2752 | lttng_rb_set_hp_online(ret); | |
2753 | ||
2754 | return 0; | |
2755 | } | |
2756 | ||
2757 | static void __exit lttng_exit_cpu_hotplug(void) | |
2758 | { | |
2759 | lttng_rb_set_hp_online(0); | |
2760 | cpuhp_remove_multi_state(lttng_hp_online); | |
2761 | lttng_rb_set_hp_prepare(0); | |
2762 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2763 | } | |
2764 | ||
2765 | #else /* #if (CONFIG_HOTPLUG_CPU && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))) */ | |
2766 | static int lttng_init_cpu_hotplug(void) | |
2767 | { | |
2768 | return 0; | |
2769 | } | |
2770 | static void lttng_exit_cpu_hotplug(void) | |
2771 | { | |
2772 | } | |
2773 | #endif /* #else #if (CONFIG_HOTPLUG_CPU && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))) */ | |
2774 | ||
2775 | ||
a90917c3 | 2776 | static int __init lttng_events_init(void) |
4e3c1b9b | 2777 | { |
1c25284c MD |
2778 | int ret; |
2779 | ||
453b2495 JD |
2780 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2781 | if (ret) | |
2782 | return ret; | |
389d7070 | 2783 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2784 | if (ret) |
2785 | return ret; | |
2786 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2787 | if (ret) |
2788 | return ret; | |
2789 | ret = lttng_probes_init(); | |
389d7070 MD |
2790 | if (ret) |
2791 | return ret; | |
07dfc1d0 | 2792 | ret = lttng_context_init(); |
20591cf7 MD |
2793 | if (ret) |
2794 | return ret; | |
07dfc1d0 MD |
2795 | ret = lttng_tracepoint_init(); |
2796 | if (ret) | |
2797 | goto error_tp; | |
a90917c3 | 2798 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2799 | if (!event_cache) { |
2800 | ret = -ENOMEM; | |
2801 | goto error_kmem; | |
2802 | } | |
80996790 | 2803 | ret = lttng_abi_init(); |
02119ee5 MD |
2804 | if (ret) |
2805 | goto error_abi; | |
0c956676 MD |
2806 | ret = lttng_logger_init(); |
2807 | if (ret) | |
2808 | goto error_logger; | |
1e367326 MD |
2809 | ret = lttng_init_cpu_hotplug(); |
2810 | if (ret) | |
2811 | goto error_hotplug; | |
489de24b MJ |
2812 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)\n", |
2813 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2814 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2815 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2816 | LTTNG_MODULES_EXTRAVERSION, | |
2817 | LTTNG_VERSION_NAME); | |
4e3c1b9b | 2818 | return 0; |
0c956676 | 2819 | |
1e367326 MD |
2820 | error_hotplug: |
2821 | lttng_logger_exit(); | |
0c956676 MD |
2822 | error_logger: |
2823 | lttng_abi_exit(); | |
02119ee5 | 2824 | error_abi: |
1c25284c | 2825 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2826 | error_kmem: |
2827 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2828 | error_tp: |
2829 | lttng_context_exit(); | |
489de24b MJ |
2830 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)\n", |
2831 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2832 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2833 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2834 | LTTNG_MODULES_EXTRAVERSION, | |
2835 | LTTNG_VERSION_NAME); | |
1c25284c | 2836 | return ret; |
4e3c1b9b MD |
2837 | } |
2838 | ||
a90917c3 | 2839 | module_init(lttng_events_init); |
11b5a3c2 | 2840 | |
a90917c3 | 2841 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2842 | { |
a90917c3 | 2843 | struct lttng_session *session, *tmpsession; |
92e94819 | 2844 | |
1e367326 | 2845 | lttng_exit_cpu_hotplug(); |
0c956676 | 2846 | lttng_logger_exit(); |
80996790 | 2847 | lttng_abi_exit(); |
92e94819 | 2848 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2849 | lttng_session_destroy(session); |
11b5a3c2 | 2850 | kmem_cache_destroy(event_cache); |
20591cf7 | 2851 | lttng_tracepoint_exit(); |
07dfc1d0 | 2852 | lttng_context_exit(); |
489de24b MJ |
2853 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)\n", |
2854 | __stringify(LTTNG_MODULES_MAJOR_VERSION), | |
2855 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2856 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2857 | LTTNG_MODULES_EXTRAVERSION, | |
2858 | LTTNG_VERSION_NAME); | |
4e3c1b9b | 2859 | } |
92e94819 | 2860 | |
a90917c3 | 2861 | module_exit(lttng_events_exit); |
11b5a3c2 | 2862 | |
92e94819 MD |
2863 | MODULE_LICENSE("GPL and additional rights"); |
2864 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2865 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2866 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2867 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2868 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2869 | LTTNG_MODULES_EXTRAVERSION); |