Commit | Line | Data |
---|---|---|
4e3c1b9b | 1 | /* |
a90917c3 | 2 | * lttng-events.c |
4e3c1b9b | 3 | * |
4e3c1b9b | 4 | * Holds LTTng per-session event registry. |
17baffe2 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
4e3c1b9b MD |
21 | */ |
22 | ||
389d7070 MD |
23 | /* |
24 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
25 | * overrides a function with a define. | |
26 | */ | |
27 | #include "wrapper/page_alloc.h" | |
28 | ||
4e3c1b9b | 29 | #include <linux/module.h> |
c0e31d2e MD |
30 | #include <linux/mutex.h> |
31 | #include <linux/sched.h> | |
11b5a3c2 | 32 | #include <linux/slab.h> |
c099397a | 33 | #include <linux/jiffies.h> |
99dc9597 | 34 | #include <linux/utsname.h> |
abc0446a | 35 | #include <linux/err.h> |
7e6f9ef6 MD |
36 | #include <linux/seq_file.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/anon_inodes.h> | |
241ae9a8 | 39 | #include <wrapper/file.h> |
3c997079 | 40 | #include <linux/jhash.h> |
8c6e7f13 | 41 | #include <linux/uaccess.h> |
a606b6e8 | 42 | #include <linux/vmalloc.h> |
3c997079 | 43 | |
241ae9a8 MD |
44 | #include <wrapper/uuid.h> |
45 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ | |
46 | #include <wrapper/random.h> | |
47 | #include <wrapper/tracepoint.h> | |
48 | #include <wrapper/list.h> | |
49 | #include <lttng-kernel-version.h> | |
50 | #include <lttng-events.h> | |
51 | #include <lttng-tracer.h> | |
52 | #include <lttng-abi-old.h> | |
d669b02d | 53 | #include <lttng-endian.h> |
241ae9a8 | 54 | #include <wrapper/vzalloc.h> |
1b7801d6 MD |
55 | #include <wrapper/ringbuffer/backend.h> |
56 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 57 | |
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
62 | /* |
63 | * Protect the sessions and metadata caches. | |
64 | */ | |
4e3c1b9b MD |
65 | static DEFINE_MUTEX(sessions_mutex); |
66 | static struct kmem_cache *event_cache; | |
67 | ||
3c997079 MD |
68 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
69 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
70 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
71 | ||
a90917c3 MD |
72 | static void _lttng_event_destroy(struct lttng_event *event); |
73 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
74 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 75 | static |
a90917c3 MD |
76 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
77 | struct lttng_channel *chan, | |
78 | struct lttng_event *event); | |
c099397a | 79 | static |
a90917c3 | 80 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 83 | |
c099397a | 84 | void synchronize_trace(void) |
abcca994 MD |
85 | { |
86 | synchronize_sched(); | |
b8590f40 MD |
87 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
88 | #ifdef CONFIG_PREEMPT_RT_FULL | |
89 | synchronize_rcu(); | |
90 | #endif | |
91 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
92 | #ifdef CONFIG_PREEMPT_RT |
93 | synchronize_rcu(); | |
94 | #endif | |
b8590f40 | 95 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
96 | } |
97 | ||
3c997079 MD |
98 | void lttng_lock_sessions(void) |
99 | { | |
100 | mutex_lock(&sessions_mutex); | |
101 | } | |
102 | ||
103 | void lttng_unlock_sessions(void) | |
104 | { | |
105 | mutex_unlock(&sessions_mutex); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Called with sessions lock held. | |
110 | */ | |
111 | int lttng_session_active(void) | |
112 | { | |
113 | struct lttng_session *iter; | |
114 | ||
115 | list_for_each_entry(iter, &sessions, list) { | |
116 | if (iter->active) | |
117 | return 1; | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
a90917c3 | 122 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 123 | { |
a90917c3 | 124 | struct lttng_session *session; |
d83004aa | 125 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 126 | int i; |
4e3c1b9b MD |
127 | |
128 | mutex_lock(&sessions_mutex); | |
a90917c3 | 129 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 130 | if (!session) |
d83004aa | 131 | goto err; |
4e3c1b9b | 132 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 133 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 134 | uuid_le_gen(&session->uuid); |
d83004aa JD |
135 | |
136 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
137 | GFP_KERNEL); | |
138 | if (!metadata_cache) | |
139 | goto err_free_session; | |
f6da044f | 140 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
141 | if (!metadata_cache->data) |
142 | goto err_free_cache; | |
143 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
144 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 145 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
146 | session->metadata_cache = metadata_cache; |
147 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
148 | memcpy(&metadata_cache->uuid, &session->uuid, |
149 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
150 | INIT_LIST_HEAD(&session->enablers_head); |
151 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
152 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
153 | list_add(&session->list, &sessions); |
154 | mutex_unlock(&sessions_mutex); | |
155 | return session; | |
d83004aa JD |
156 | |
157 | err_free_cache: | |
158 | kfree(metadata_cache); | |
159 | err_free_session: | |
160 | kfree(session); | |
161 | err: | |
162 | mutex_unlock(&sessions_mutex); | |
163 | return NULL; | |
164 | } | |
165 | ||
166 | void metadata_cache_destroy(struct kref *kref) | |
167 | { | |
168 | struct lttng_metadata_cache *cache = | |
169 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 170 | vfree(cache->data); |
d83004aa | 171 | kfree(cache); |
4e3c1b9b MD |
172 | } |
173 | ||
a90917c3 | 174 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 175 | { |
a90917c3 MD |
176 | struct lttng_channel *chan, *tmpchan; |
177 | struct lttng_event *event, *tmpevent; | |
d83004aa | 178 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 179 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 180 | int ret; |
4e3c1b9b MD |
181 | |
182 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 183 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
184 | list_for_each_entry(chan, &session->chan, list) { |
185 | ret = lttng_syscalls_unregister(chan); | |
186 | WARN_ON(ret); | |
187 | } | |
dda6a249 | 188 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 189 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
190 | WARN_ON(ret); |
191 | } | |
abcca994 | 192 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
193 | list_for_each_entry_safe(enabler, tmpenabler, |
194 | &session->enablers_head, node) | |
195 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 196 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 197 | _lttng_event_destroy(event); |
d83004aa JD |
198 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
199 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 200 | _lttng_channel_destroy(chan); |
d83004aa JD |
201 | } |
202 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
203 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
204 | if (session->pid_tracker) |
205 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 206 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
207 | list_del(&session->list); |
208 | mutex_unlock(&sessions_mutex); | |
209 | kfree(session); | |
210 | } | |
211 | ||
a90917c3 | 212 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
213 | { |
214 | int ret = 0; | |
a90917c3 | 215 | struct lttng_channel *chan; |
c0e31d2e MD |
216 | |
217 | mutex_lock(&sessions_mutex); | |
218 | if (session->active) { | |
219 | ret = -EBUSY; | |
220 | goto end; | |
221 | } | |
c099397a | 222 | |
3c997079 MD |
223 | /* Set transient enabler state to "enabled" */ |
224 | session->tstate = 1; | |
225 | ||
c099397a MD |
226 | /* |
227 | * Snapshot the number of events per channel to know the type of header | |
228 | * we need to use. | |
229 | */ | |
230 | list_for_each_entry(chan, &session->chan, list) { | |
231 | if (chan->header_type) | |
232 | continue; /* don't change it if session stop/restart */ | |
233 | if (chan->free_event_id < 31) | |
234 | chan->header_type = 1; /* compact */ | |
235 | else | |
236 | chan->header_type = 2; /* large */ | |
237 | } | |
238 | ||
3c997079 MD |
239 | /* We need to sync enablers with session before activation. */ |
240 | lttng_session_sync_enablers(session); | |
241 | ||
1b7801d6 MD |
242 | /* Clear each stream's quiescent state. */ |
243 | list_for_each_entry(chan, &session->chan, list) | |
244 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
245 | ||
52fc2e1f | 246 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 247 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 248 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
249 | if (ret) { |
250 | ACCESS_ONCE(session->active) = 0; | |
251 | goto end; | |
252 | } | |
253 | ret = lttng_statedump_start(session); | |
360f38ea | 254 | if (ret) |
c099397a | 255 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
256 | end: |
257 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 258 | return ret; |
c0e31d2e MD |
259 | } |
260 | ||
a90917c3 | 261 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
262 | { |
263 | int ret = 0; | |
1b7801d6 | 264 | struct lttng_channel *chan; |
c0e31d2e MD |
265 | |
266 | mutex_lock(&sessions_mutex); | |
267 | if (!session->active) { | |
268 | ret = -EBUSY; | |
269 | goto end; | |
270 | } | |
52fc2e1f | 271 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
272 | |
273 | /* Set transient enabler state to "disabled" */ | |
274 | session->tstate = 0; | |
275 | lttng_session_sync_enablers(session); | |
1b7801d6 MD |
276 | |
277 | /* Set each stream's quiescent state. */ | |
278 | list_for_each_entry(chan, &session->chan, list) | |
279 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
c0e31d2e MD |
280 | end: |
281 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 282 | return ret; |
c0e31d2e MD |
283 | } |
284 | ||
9616f0bf JD |
285 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
286 | { | |
287 | int ret = 0; | |
288 | struct lttng_channel *chan; | |
289 | struct lttng_event *event; | |
290 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
291 | struct lttng_metadata_stream *stream; | |
292 | ||
293 | mutex_lock(&sessions_mutex); | |
294 | if (!session->active) { | |
295 | ret = -EBUSY; | |
296 | goto end; | |
297 | } | |
298 | ||
299 | mutex_lock(&cache->lock); | |
300 | memset(cache->data, 0, cache->cache_alloc); | |
301 | cache->metadata_written = 0; | |
302 | cache->version++; | |
303 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
304 | stream->metadata_out = 0; | |
305 | stream->metadata_in = 0; | |
306 | } | |
307 | mutex_unlock(&cache->lock); | |
308 | ||
309 | session->metadata_dumped = 0; | |
310 | list_for_each_entry(chan, &session->chan, list) { | |
311 | chan->metadata_dumped = 0; | |
312 | } | |
313 | ||
314 | list_for_each_entry(event, &session->events, list) { | |
315 | event->metadata_dumped = 0; | |
316 | } | |
317 | ||
318 | ret = _lttng_session_metadata_statedump(session); | |
319 | ||
320 | end: | |
321 | mutex_unlock(&sessions_mutex); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | ||
326 | ||
a90917c3 | 327 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 328 | { |
3c997079 | 329 | int ret = 0; |
e64957da | 330 | |
3c997079 MD |
331 | mutex_lock(&sessions_mutex); |
332 | if (channel->channel_type == METADATA_CHANNEL) { | |
333 | ret = -EPERM; | |
334 | goto end; | |
335 | } | |
336 | if (channel->enabled) { | |
337 | ret = -EEXIST; | |
338 | goto end; | |
339 | } | |
340 | /* Set transient enabler state to "enabled" */ | |
341 | channel->tstate = 1; | |
342 | lttng_session_sync_enablers(channel->session); | |
343 | /* Set atomically the state to "enabled" */ | |
344 | ACCESS_ONCE(channel->enabled) = 1; | |
345 | end: | |
346 | mutex_unlock(&sessions_mutex); | |
347 | return ret; | |
e64957da MD |
348 | } |
349 | ||
a90917c3 | 350 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 351 | { |
3c997079 | 352 | int ret = 0; |
e64957da | 353 | |
3c997079 MD |
354 | mutex_lock(&sessions_mutex); |
355 | if (channel->channel_type == METADATA_CHANNEL) { | |
356 | ret = -EPERM; | |
357 | goto end; | |
358 | } | |
359 | if (!channel->enabled) { | |
360 | ret = -EEXIST; | |
361 | goto end; | |
362 | } | |
363 | /* Set atomically the state to "disabled" */ | |
364 | ACCESS_ONCE(channel->enabled) = 0; | |
365 | /* Set transient enabler state to "enabled" */ | |
366 | channel->tstate = 0; | |
367 | lttng_session_sync_enablers(channel->session); | |
368 | end: | |
369 | mutex_unlock(&sessions_mutex); | |
370 | return ret; | |
e64957da MD |
371 | } |
372 | ||
a90917c3 | 373 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 374 | { |
3c997079 | 375 | int ret = 0; |
e64957da | 376 | |
3c997079 MD |
377 | mutex_lock(&sessions_mutex); |
378 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
379 | ret = -EPERM; | |
380 | goto end; | |
381 | } | |
382 | if (event->enabled) { | |
383 | ret = -EEXIST; | |
384 | goto end; | |
385 | } | |
a0493bef MD |
386 | switch (event->instrumentation) { |
387 | case LTTNG_KERNEL_TRACEPOINT: | |
388 | case LTTNG_KERNEL_SYSCALL: | |
389 | ret = -EINVAL; | |
390 | break; | |
391 | case LTTNG_KERNEL_KPROBE: | |
392 | case LTTNG_KERNEL_FUNCTION: | |
393 | case LTTNG_KERNEL_NOOP: | |
394 | ACCESS_ONCE(event->enabled) = 1; | |
395 | break; | |
396 | case LTTNG_KERNEL_KRETPROBE: | |
397 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
398 | break; | |
399 | default: | |
400 | WARN_ON_ONCE(1); | |
401 | ret = -EINVAL; | |
402 | } | |
3c997079 MD |
403 | end: |
404 | mutex_unlock(&sessions_mutex); | |
405 | return ret; | |
e64957da MD |
406 | } |
407 | ||
a90917c3 | 408 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 409 | { |
3c997079 | 410 | int ret = 0; |
e64957da | 411 | |
3c997079 MD |
412 | mutex_lock(&sessions_mutex); |
413 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
414 | ret = -EPERM; | |
415 | goto end; | |
416 | } | |
417 | if (!event->enabled) { | |
418 | ret = -EEXIST; | |
419 | goto end; | |
420 | } | |
a0493bef MD |
421 | switch (event->instrumentation) { |
422 | case LTTNG_KERNEL_TRACEPOINT: | |
423 | case LTTNG_KERNEL_SYSCALL: | |
424 | ret = -EINVAL; | |
425 | break; | |
426 | case LTTNG_KERNEL_KPROBE: | |
427 | case LTTNG_KERNEL_FUNCTION: | |
428 | case LTTNG_KERNEL_NOOP: | |
429 | ACCESS_ONCE(event->enabled) = 0; | |
430 | break; | |
431 | case LTTNG_KERNEL_KRETPROBE: | |
432 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
433 | break; | |
434 | default: | |
435 | WARN_ON_ONCE(1); | |
436 | ret = -EINVAL; | |
437 | } | |
3c997079 MD |
438 | end: |
439 | mutex_unlock(&sessions_mutex); | |
440 | return ret; | |
e64957da MD |
441 | } |
442 | ||
a90917c3 | 443 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 444 | { |
a90917c3 | 445 | struct lttng_transport *transport; |
f3d01b96 | 446 | |
a90917c3 | 447 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
448 | if (!strcmp(transport->name, name)) |
449 | return transport; | |
450 | } | |
451 | return NULL; | |
452 | } | |
453 | ||
a90917c3 | 454 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
455 | const char *transport_name, |
456 | void *buf_addr, | |
4e3c1b9b MD |
457 | size_t subbuf_size, size_t num_subbuf, |
458 | unsigned int switch_timer_interval, | |
d83004aa JD |
459 | unsigned int read_timer_interval, |
460 | enum channel_type channel_type) | |
4e3c1b9b | 461 | { |
a90917c3 MD |
462 | struct lttng_channel *chan; |
463 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
464 | |
465 | mutex_lock(&sessions_mutex); | |
d83004aa | 466 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 467 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 468 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
469 | if (!transport) { |
470 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
471 | transport_name); | |
c0e31d2e | 472 | goto notransport; |
f3d01b96 | 473 | } |
a33c9927 MD |
474 | if (!try_module_get(transport->owner)) { |
475 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
476 | goto notransport; | |
477 | } | |
a90917c3 | 478 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 479 | if (!chan) |
c0e31d2e | 480 | goto nomem; |
4e3c1b9b | 481 | chan->session = session; |
05d32c64 | 482 | chan->id = session->free_chan_id++; |
3b731ab1 | 483 | chan->ops = &transport->ops; |
125b4df4 MD |
484 | /* |
485 | * Note: the channel creation op already writes into the packet | |
486 | * headers. Therefore the "chan" information used as input | |
487 | * should be already accessible. | |
488 | */ | |
5f5ddf01 MD |
489 | chan->chan = transport->ops.channel_create(transport_name, |
490 | chan, buf_addr, subbuf_size, num_subbuf, | |
491 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
492 | if (!chan->chan) |
493 | goto create_error; | |
3c997079 | 494 | chan->tstate = 1; |
e64957da | 495 | chan->enabled = 1; |
a33c9927 | 496 | chan->transport = transport; |
d83004aa | 497 | chan->channel_type = channel_type; |
4e3c1b9b MD |
498 | list_add(&chan->list, &session->chan); |
499 | mutex_unlock(&sessions_mutex); | |
500 | return chan; | |
501 | ||
f3d01b96 MD |
502 | create_error: |
503 | kfree(chan); | |
c0e31d2e | 504 | nomem: |
a33c9927 MD |
505 | if (transport) |
506 | module_put(transport->owner); | |
c0e31d2e | 507 | notransport: |
e5382b6d | 508 | active: |
4e3c1b9b MD |
509 | mutex_unlock(&sessions_mutex); |
510 | return NULL; | |
511 | } | |
512 | ||
513 | /* | |
d83004aa JD |
514 | * Only used internally at session destruction for per-cpu channels, and |
515 | * when metadata channel is released. | |
516 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 517 | */ |
aa7c23a9 | 518 | static |
a90917c3 | 519 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 520 | { |
11b5a3c2 | 521 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 522 | module_put(chan->transport->owner); |
4e3c1b9b | 523 | list_del(&chan->list); |
8070f5c0 | 524 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
525 | kfree(chan); |
526 | } | |
527 | ||
d83004aa JD |
528 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
529 | { | |
530 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
531 | ||
532 | /* Protect the metadata cache with the sessions_mutex. */ | |
533 | mutex_lock(&sessions_mutex); | |
534 | _lttng_channel_destroy(chan); | |
535 | mutex_unlock(&sessions_mutex); | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
538 | ||
539 | static | |
540 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
541 | { | |
542 | stream->finalized = 1; | |
543 | wake_up_interruptible(&stream->read_wait); | |
544 | } | |
545 | ||
e5382b6d MD |
546 | /* |
547 | * Supports event creation while tracing session is active. | |
3c997079 | 548 | * Needs to be called with sessions mutex held. |
e5382b6d | 549 | */ |
3c997079 MD |
550 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
551 | struct lttng_kernel_event *event_param, | |
552 | void *filter, | |
553 | const struct lttng_event_desc *event_desc, | |
554 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 555 | { |
3c997079 | 556 | struct lttng_session *session = chan->session; |
a90917c3 | 557 | struct lttng_event *event; |
3c997079 MD |
558 | const char *event_name; |
559 | struct hlist_head *head; | |
560 | size_t name_len; | |
561 | uint32_t hash; | |
3d084699 | 562 | int ret; |
4e3c1b9b | 563 | |
abc0446a | 564 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 565 | ret = -EMFILE; |
e5382b6d | 566 | goto full; |
abc0446a | 567 | } |
3c997079 MD |
568 | |
569 | switch (itype) { | |
570 | case LTTNG_KERNEL_TRACEPOINT: | |
571 | event_name = event_desc->name; | |
572 | break; | |
573 | case LTTNG_KERNEL_KPROBE: | |
574 | case LTTNG_KERNEL_KRETPROBE: | |
575 | case LTTNG_KERNEL_FUNCTION: | |
576 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 577 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
578 | event_name = event_param->name; |
579 | break; | |
580 | default: | |
581 | WARN_ON_ONCE(1); | |
582 | ret = -EINVAL; | |
583 | goto type_error; | |
584 | } | |
585 | name_len = strlen(event_name); | |
586 | hash = jhash(event_name, name_len, 0); | |
587 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 588 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
589 | WARN_ON_ONCE(!event->desc); |
590 | if (!strncmp(event->desc->name, event_name, | |
591 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
592 | && chan == event->chan) { | |
593 | ret = -EEXIST; | |
594 | goto exist; | |
abc0446a MD |
595 | } |
596 | } | |
3c997079 | 597 | |
11b5a3c2 | 598 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 599 | if (!event) { |
4cf0bf51 | 600 | ret = -ENOMEM; |
4e3c1b9b | 601 | goto cache_error; |
abc0446a | 602 | } |
4e3c1b9b MD |
603 | event->chan = chan; |
604 | event->filter = filter; | |
e5382b6d | 605 | event->id = chan->free_event_id++; |
3c997079 MD |
606 | event->instrumentation = itype; |
607 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 608 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
609 | INIT_LIST_HEAD(&event->enablers_ref_head); |
610 | ||
611 | switch (itype) { | |
ab2277d6 | 612 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
613 | /* Event will be enabled by enabler sync. */ |
614 | event->enabled = 0; | |
615 | event->registered = 0; | |
616 | event->desc = lttng_event_get(event_name); | |
abc0446a | 617 | if (!event->desc) { |
4cf0bf51 | 618 | ret = -ENOENT; |
d3dbe23c | 619 | goto register_error; |
abc0446a | 620 | } |
3c997079 MD |
621 | /* Populate lttng_event structure before event registration. */ |
622 | smp_wmb(); | |
baf20995 | 623 | break; |
ab2277d6 | 624 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
625 | /* |
626 | * Needs to be explicitly enabled after creation, since | |
627 | * we may want to apply filters. | |
628 | */ | |
629 | event->enabled = 0; | |
3c997079 MD |
630 | event->registered = 1; |
631 | /* | |
632 | * Populate lttng_event structure before event | |
633 | * registration. | |
634 | */ | |
635 | smp_wmb(); | |
636 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
637 | event_param->u.kprobe.symbol_name, |
638 | event_param->u.kprobe.offset, | |
639 | event_param->u.kprobe.addr, | |
640 | event); | |
abc0446a | 641 | if (ret) { |
4cf0bf51 | 642 | ret = -EINVAL; |
d6d808f3 | 643 | goto register_error; |
abc0446a | 644 | } |
edeb3137 MD |
645 | ret = try_module_get(event->desc->owner); |
646 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 647 | break; |
7371f44c MD |
648 | case LTTNG_KERNEL_KRETPROBE: |
649 | { | |
a90917c3 | 650 | struct lttng_event *event_return; |
7371f44c MD |
651 | |
652 | /* kretprobe defines 2 events */ | |
a0493bef MD |
653 | /* |
654 | * Needs to be explicitly enabled after creation, since | |
655 | * we may want to apply filters. | |
656 | */ | |
657 | event->enabled = 0; | |
3c997079 | 658 | event->registered = 1; |
7371f44c MD |
659 | event_return = |
660 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 661 | if (!event_return) { |
4cf0bf51 | 662 | ret = -ENOMEM; |
7371f44c | 663 | goto register_error; |
abc0446a | 664 | } |
7371f44c MD |
665 | event_return->chan = chan; |
666 | event_return->filter = filter; | |
667 | event_return->id = chan->free_event_id++; | |
a0493bef | 668 | event_return->enabled = 0; |
3c997079 MD |
669 | event_return->registered = 1; |
670 | event_return->instrumentation = itype; | |
7371f44c | 671 | /* |
a90917c3 | 672 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
673 | */ |
674 | smp_wmb(); | |
3c997079 | 675 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
676 | event_param->u.kretprobe.symbol_name, |
677 | event_param->u.kretprobe.offset, | |
678 | event_param->u.kretprobe.addr, | |
679 | event, event_return); | |
680 | if (ret) { | |
681 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 682 | ret = -EINVAL; |
7371f44c MD |
683 | goto register_error; |
684 | } | |
685 | /* Take 2 refs on the module: one per event. */ | |
686 | ret = try_module_get(event->desc->owner); | |
687 | WARN_ON_ONCE(!ret); | |
688 | ret = try_module_get(event->desc->owner); | |
689 | WARN_ON_ONCE(!ret); | |
a90917c3 | 690 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 691 | event_return); |
abc0446a | 692 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
693 | if (ret) { |
694 | kmem_cache_free(event_cache, event_return); | |
695 | module_put(event->desc->owner); | |
696 | module_put(event->desc->owner); | |
697 | goto statedump_error; | |
698 | } | |
699 | list_add(&event_return->list, &chan->session->events); | |
700 | break; | |
701 | } | |
ab2277d6 | 702 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
703 | /* |
704 | * Needs to be explicitly enabled after creation, since | |
705 | * we may want to apply filters. | |
706 | */ | |
707 | event->enabled = 0; | |
3c997079 MD |
708 | event->registered = 1; |
709 | /* | |
710 | * Populate lttng_event structure before event | |
711 | * registration. | |
712 | */ | |
713 | smp_wmb(); | |
714 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
715 | event_param->u.ftrace.symbol_name, |
716 | event); | |
abc0446a | 717 | if (ret) { |
e0a7a7c4 | 718 | goto register_error; |
abc0446a | 719 | } |
edeb3137 MD |
720 | ret = try_module_get(event->desc->owner); |
721 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 722 | break; |
1ec65de1 | 723 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 724 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
725 | /* |
726 | * Needs to be explicitly enabled after creation, since | |
727 | * we may want to apply filters. | |
728 | */ | |
729 | event->enabled = 0; | |
3c997079 MD |
730 | event->registered = 0; |
731 | event->desc = event_desc; | |
abc0446a | 732 | if (!event->desc) { |
4cf0bf51 | 733 | ret = -EINVAL; |
259b6cb3 | 734 | goto register_error; |
abc0446a | 735 | } |
1ec65de1 | 736 | break; |
baf20995 MD |
737 | default: |
738 | WARN_ON_ONCE(1); | |
4cf0bf51 | 739 | ret = -EINVAL; |
df07930b | 740 | goto register_error; |
baf20995 | 741 | } |
a90917c3 | 742 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
743 | WARN_ON_ONCE(ret > 0); |
744 | if (ret) { | |
c099397a | 745 | goto statedump_error; |
abc0446a | 746 | } |
3c997079 | 747 | hlist_add_head(&event->hlist, head); |
dda6a249 | 748 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
749 | return event; |
750 | ||
c099397a | 751 | statedump_error: |
259b6cb3 | 752 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 753 | register_error: |
11b5a3c2 | 754 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
755 | cache_error: |
756 | exist: | |
3c997079 | 757 | type_error: |
e5382b6d | 758 | full: |
4cf0bf51 | 759 | return ERR_PTR(ret); |
4e3c1b9b MD |
760 | } |
761 | ||
3c997079 MD |
762 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
763 | struct lttng_kernel_event *event_param, | |
764 | void *filter, | |
765 | const struct lttng_event_desc *event_desc, | |
766 | enum lttng_kernel_instrumentation itype) | |
767 | { | |
768 | struct lttng_event *event; | |
769 | ||
770 | mutex_lock(&sessions_mutex); | |
771 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
772 | itype); | |
773 | mutex_unlock(&sessions_mutex); | |
774 | return event; | |
775 | } | |
776 | ||
777 | /* Only used for tracepoints for now. */ | |
778 | static | |
779 | void register_event(struct lttng_event *event) | |
780 | { | |
781 | const struct lttng_event_desc *desc; | |
f127e61e | 782 | int ret = -EINVAL; |
3c997079 | 783 | |
3c997079 MD |
784 | if (event->registered) |
785 | return; | |
4ecb5ad5 | 786 | |
3c997079 | 787 | desc = event->desc; |
4ecb5ad5 MD |
788 | switch (event->instrumentation) { |
789 | case LTTNG_KERNEL_TRACEPOINT: | |
790 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
791 | desc->probe_callback, | |
792 | event); | |
793 | break; | |
794 | case LTTNG_KERNEL_SYSCALL: | |
795 | ret = lttng_syscall_filter_enable(event->chan, | |
796 | desc->name); | |
797 | break; | |
798 | case LTTNG_KERNEL_KPROBE: | |
799 | case LTTNG_KERNEL_KRETPROBE: | |
800 | case LTTNG_KERNEL_FUNCTION: | |
801 | case LTTNG_KERNEL_NOOP: | |
802 | ret = 0; | |
803 | break; | |
804 | default: | |
805 | WARN_ON_ONCE(1); | |
806 | } | |
3c997079 MD |
807 | if (!ret) |
808 | event->registered = 1; | |
809 | } | |
810 | ||
4e3c1b9b MD |
811 | /* |
812 | * Only used internally at session destruction. | |
813 | */ | |
a90917c3 | 814 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 815 | { |
4ecb5ad5 | 816 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
817 | int ret = -EINVAL; |
818 | ||
3c997079 MD |
819 | if (!event->registered) |
820 | return 0; | |
821 | ||
4ecb5ad5 | 822 | desc = event->desc; |
38d024ae | 823 | switch (event->instrumentation) { |
ab2277d6 | 824 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 825 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 826 | event->desc->probe_callback, |
11b5a3c2 | 827 | event); |
baf20995 | 828 | break; |
ab2277d6 | 829 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 830 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
831 | ret = 0; |
832 | break; | |
7371f44c MD |
833 | case LTTNG_KERNEL_KRETPROBE: |
834 | lttng_kretprobes_unregister(event); | |
835 | ret = 0; | |
836 | break; | |
ab2277d6 | 837 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
838 | lttng_ftrace_unregister(event); |
839 | ret = 0; | |
840 | break; | |
33a39a3c | 841 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
842 | ret = lttng_syscall_filter_disable(event->chan, |
843 | desc->name); | |
844 | break; | |
845 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
846 | ret = 0; |
847 | break; | |
baf20995 MD |
848 | default: |
849 | WARN_ON_ONCE(1); | |
850 | } | |
3c997079 MD |
851 | if (!ret) |
852 | event->registered = 0; | |
dda6a249 MD |
853 | return ret; |
854 | } | |
855 | ||
856 | /* | |
857 | * Only used internally at session destruction. | |
858 | */ | |
be066e6c | 859 | static |
a90917c3 | 860 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 861 | { |
edeb3137 MD |
862 | switch (event->instrumentation) { |
863 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 864 | lttng_event_put(event->desc); |
edeb3137 MD |
865 | break; |
866 | case LTTNG_KERNEL_KPROBE: | |
867 | module_put(event->desc->owner); | |
868 | lttng_kprobes_destroy_private(event); | |
869 | break; | |
7371f44c MD |
870 | case LTTNG_KERNEL_KRETPROBE: |
871 | module_put(event->desc->owner); | |
872 | lttng_kretprobes_destroy_private(event); | |
873 | break; | |
edeb3137 MD |
874 | case LTTNG_KERNEL_FUNCTION: |
875 | module_put(event->desc->owner); | |
876 | lttng_ftrace_destroy_private(event); | |
877 | break; | |
259b6cb3 | 878 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 879 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 880 | break; |
edeb3137 MD |
881 | default: |
882 | WARN_ON_ONCE(1); | |
883 | } | |
dda6a249 | 884 | list_del(&event->list); |
8070f5c0 | 885 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 886 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
887 | } |
888 | ||
e0130fab MD |
889 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
890 | { | |
891 | int ret; | |
892 | ||
893 | if (pid < -1) | |
894 | return -EINVAL; | |
895 | mutex_lock(&sessions_mutex); | |
896 | if (pid == -1) { | |
897 | /* track all pids: destroy tracker. */ | |
898 | if (session->pid_tracker) { | |
899 | struct lttng_pid_tracker *lpf; | |
900 | ||
901 | lpf = session->pid_tracker; | |
902 | rcu_assign_pointer(session->pid_tracker, NULL); | |
903 | synchronize_trace(); | |
904 | lttng_pid_tracker_destroy(lpf); | |
905 | } | |
906 | ret = 0; | |
907 | } else { | |
908 | if (!session->pid_tracker) { | |
909 | struct lttng_pid_tracker *lpf; | |
910 | ||
911 | lpf = lttng_pid_tracker_create(); | |
912 | if (!lpf) { | |
913 | ret = -ENOMEM; | |
914 | goto unlock; | |
915 | } | |
916 | ret = lttng_pid_tracker_add(lpf, pid); | |
917 | rcu_assign_pointer(session->pid_tracker, lpf); | |
918 | } else { | |
919 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
920 | } | |
921 | } | |
922 | unlock: | |
923 | mutex_unlock(&sessions_mutex); | |
924 | return ret; | |
925 | } | |
926 | ||
927 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
928 | { | |
929 | int ret; | |
930 | ||
931 | if (pid < -1) | |
932 | return -EINVAL; | |
933 | mutex_lock(&sessions_mutex); | |
934 | if (pid == -1) { | |
935 | /* untrack all pids: replace by empty tracker. */ | |
936 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
937 | struct lttng_pid_tracker *lpf; | |
938 | ||
939 | lpf = lttng_pid_tracker_create(); | |
940 | if (!lpf) { | |
941 | ret = -ENOMEM; | |
942 | goto unlock; | |
943 | } | |
944 | rcu_assign_pointer(session->pid_tracker, lpf); | |
945 | synchronize_trace(); | |
946 | if (old_lpf) | |
947 | lttng_pid_tracker_destroy(old_lpf); | |
948 | ret = 0; | |
949 | } else { | |
950 | if (!session->pid_tracker) { | |
951 | ret = -ENOENT; | |
952 | goto unlock; | |
953 | } | |
954 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
955 | } | |
956 | unlock: | |
957 | mutex_unlock(&sessions_mutex); | |
958 | return ret; | |
959 | } | |
960 | ||
7e6f9ef6 MD |
961 | static |
962 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
963 | { | |
964 | struct lttng_session *session = m->private; | |
965 | struct lttng_pid_tracker *lpf; | |
966 | struct lttng_pid_hash_node *e; | |
967 | int iter = 0, i; | |
968 | ||
969 | mutex_lock(&sessions_mutex); | |
970 | lpf = session->pid_tracker; | |
971 | if (lpf) { | |
972 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
973 | struct hlist_head *head = &lpf->pid_hash[i]; | |
974 | ||
f934e302 | 975 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
976 | if (iter++ >= *pos) |
977 | return e; | |
978 | } | |
979 | } | |
980 | } else { | |
981 | /* PID tracker disabled. */ | |
982 | if (iter >= *pos && iter == 0) { | |
983 | return session; /* empty tracker */ | |
984 | } | |
985 | iter++; | |
986 | } | |
987 | /* End of list */ | |
988 | return NULL; | |
989 | } | |
990 | ||
991 | /* Called with sessions_mutex held. */ | |
992 | static | |
993 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
994 | { | |
995 | struct lttng_session *session = m->private; | |
996 | struct lttng_pid_tracker *lpf; | |
997 | struct lttng_pid_hash_node *e; | |
998 | int iter = 0, i; | |
999 | ||
1000 | (*ppos)++; | |
1001 | lpf = session->pid_tracker; | |
1002 | if (lpf) { | |
1003 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1004 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1005 | ||
f934e302 | 1006 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1007 | if (iter++ >= *ppos) |
1008 | return e; | |
1009 | } | |
1010 | } | |
1011 | } else { | |
1012 | /* PID tracker disabled. */ | |
1013 | if (iter >= *ppos && iter == 0) | |
1014 | return session; /* empty tracker */ | |
1015 | iter++; | |
1016 | } | |
1017 | ||
1018 | /* End of list */ | |
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | static | |
1023 | void pid_list_stop(struct seq_file *m, void *p) | |
1024 | { | |
1025 | mutex_unlock(&sessions_mutex); | |
1026 | } | |
1027 | ||
1028 | static | |
1029 | int pid_list_show(struct seq_file *m, void *p) | |
1030 | { | |
1031 | int pid; | |
1032 | ||
1033 | if (p == m->private) { | |
1034 | /* Tracker disabled. */ | |
1035 | pid = -1; | |
1036 | } else { | |
1037 | const struct lttng_pid_hash_node *e = p; | |
1038 | ||
1039 | pid = lttng_pid_tracker_get_node_pid(e); | |
1040 | } | |
1041 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | static | |
1046 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1047 | .start = pid_list_start, | |
1048 | .next = pid_list_next, | |
1049 | .stop = pid_list_stop, | |
1050 | .show = pid_list_show, | |
1051 | }; | |
1052 | ||
1053 | static | |
1054 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1055 | { | |
1056 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1057 | } | |
1058 | ||
1059 | static | |
1060 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1061 | { | |
1062 | struct seq_file *m = file->private_data; | |
1063 | struct lttng_session *session = m->private; | |
1064 | int ret; | |
1065 | ||
1066 | WARN_ON_ONCE(!session); | |
1067 | ret = seq_release(inode, file); | |
1068 | if (!ret && session) | |
1069 | fput(session->file); | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1074 | .owner = THIS_MODULE, | |
1075 | .open = lttng_tracker_pids_list_open, | |
1076 | .read = seq_read, | |
1077 | .llseek = seq_lseek, | |
1078 | .release = lttng_tracker_pids_list_release, | |
1079 | }; | |
1080 | ||
1081 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1082 | { | |
1083 | struct file *tracker_pids_list_file; | |
1084 | struct seq_file *m; | |
1085 | int file_fd, ret; | |
1086 | ||
1087 | file_fd = lttng_get_unused_fd(); | |
1088 | if (file_fd < 0) { | |
1089 | ret = file_fd; | |
1090 | goto fd_error; | |
1091 | } | |
1092 | ||
1093 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1094 | <tng_tracker_pids_list_fops, | |
1095 | NULL, O_RDWR); | |
1096 | if (IS_ERR(tracker_pids_list_file)) { | |
1097 | ret = PTR_ERR(tracker_pids_list_file); | |
1098 | goto file_error; | |
1099 | } | |
9c1f4643 MD |
1100 | if (atomic_long_add_unless(&session->file->f_count, |
1101 | 1, INT_MAX) == INT_MAX) { | |
1102 | goto refcount_error; | |
1103 | } | |
7e6f9ef6 MD |
1104 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1105 | if (ret < 0) | |
1106 | goto open_error; | |
1107 | m = tracker_pids_list_file->private_data; | |
1108 | m->private = session; | |
1109 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1110 | |
1111 | return file_fd; | |
1112 | ||
1113 | open_error: | |
9c1f4643 MD |
1114 | atomic_long_dec(&session->file->f_count); |
1115 | refcount_error: | |
7e6f9ef6 MD |
1116 | fput(tracker_pids_list_file); |
1117 | file_error: | |
1118 | put_unused_fd(file_fd); | |
1119 | fd_error: | |
1120 | return ret; | |
1121 | } | |
1122 | ||
3c997079 MD |
1123 | /* |
1124 | * Enabler management. | |
1125 | */ | |
1126 | static | |
4ecb5ad5 MD |
1127 | int lttng_match_enabler_wildcard(const char *desc_name, |
1128 | const char *name) | |
3c997079 | 1129 | { |
3c997079 | 1130 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1131 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1132 | return 0; |
1133 | return 1; | |
1134 | } | |
1135 | ||
1136 | static | |
4ecb5ad5 MD |
1137 | int lttng_match_enabler_name(const char *desc_name, |
1138 | const char *name) | |
3c997079 | 1139 | { |
4ecb5ad5 | 1140 | if (strcmp(desc_name, name)) |
3c997079 MD |
1141 | return 0; |
1142 | return 1; | |
1143 | } | |
1144 | ||
1145 | static | |
1146 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1147 | struct lttng_enabler *enabler) | |
1148 | { | |
4ecb5ad5 MD |
1149 | const char *desc_name, *enabler_name; |
1150 | ||
1151 | enabler_name = enabler->event_param.name; | |
1152 | switch (enabler->event_param.instrumentation) { | |
1153 | case LTTNG_KERNEL_TRACEPOINT: | |
1154 | desc_name = desc->name; | |
1155 | break; | |
1156 | case LTTNG_KERNEL_SYSCALL: | |
1157 | desc_name = desc->name; | |
1158 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1159 | desc_name += strlen("compat_"); | |
1160 | if (!strncmp(desc_name, "syscall_exit_", | |
1161 | strlen("syscall_exit_"))) { | |
1162 | desc_name += strlen("syscall_exit_"); | |
1163 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1164 | strlen("syscall_entry_"))) { | |
1165 | desc_name += strlen("syscall_entry_"); | |
1166 | } else { | |
1167 | WARN_ON_ONCE(1); | |
1168 | return -EINVAL; | |
1169 | } | |
1170 | break; | |
1171 | default: | |
1172 | WARN_ON_ONCE(1); | |
1173 | return -EINVAL; | |
1174 | } | |
3c997079 MD |
1175 | switch (enabler->type) { |
1176 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1177 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1178 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1179 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1180 | default: |
1181 | return -EINVAL; | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static | |
1186 | int lttng_event_match_enabler(struct lttng_event *event, | |
1187 | struct lttng_enabler *enabler) | |
1188 | { | |
33a39a3c MD |
1189 | if (enabler->event_param.instrumentation != event->instrumentation) |
1190 | return 0; | |
3c997079 MD |
1191 | if (lttng_desc_match_enabler(event->desc, enabler) |
1192 | && event->chan == enabler->chan) | |
1193 | return 1; | |
1194 | else | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | static | |
1199 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1200 | struct lttng_enabler *enabler) | |
1201 | { | |
1202 | struct lttng_enabler_ref *enabler_ref; | |
1203 | ||
1204 | list_for_each_entry(enabler_ref, | |
1205 | &event->enablers_ref_head, node) { | |
1206 | if (enabler_ref->ref == enabler) | |
1207 | return enabler_ref; | |
1208 | } | |
1209 | return NULL; | |
1210 | } | |
1211 | ||
3c997079 | 1212 | static |
33a39a3c | 1213 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1214 | { |
1215 | struct lttng_session *session = enabler->chan->session; | |
1216 | struct lttng_probe_desc *probe_desc; | |
1217 | const struct lttng_event_desc *desc; | |
1218 | int i; | |
1219 | struct list_head *probe_list; | |
1220 | ||
1221 | probe_list = lttng_get_probe_list_head(); | |
1222 | /* | |
1223 | * For each probe event, if we find that a probe event matches | |
1224 | * our enabler, create an associated lttng_event if not | |
1225 | * already present. | |
1226 | */ | |
1227 | list_for_each_entry(probe_desc, probe_list, head) { | |
1228 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1229 | int found = 0; | |
1230 | struct hlist_head *head; | |
1231 | const char *event_name; | |
1232 | size_t name_len; | |
1233 | uint32_t hash; | |
1234 | struct lttng_event *event; | |
1235 | ||
1236 | desc = probe_desc->event_desc[i]; | |
1237 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1238 | continue; | |
1239 | event_name = desc->name; | |
1240 | name_len = strlen(event_name); | |
1241 | ||
1242 | /* | |
1243 | * Check if already created. | |
1244 | */ | |
1245 | hash = jhash(event_name, name_len, 0); | |
1246 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1247 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1248 | if (event->desc == desc |
1249 | && event->chan == enabler->chan) | |
1250 | found = 1; | |
1251 | } | |
1252 | if (found) | |
1253 | continue; | |
1254 | ||
1255 | /* | |
1256 | * We need to create an event for this | |
1257 | * event probe. | |
1258 | */ | |
1259 | event = _lttng_event_create(enabler->chan, | |
1260 | NULL, NULL, desc, | |
1261 | LTTNG_KERNEL_TRACEPOINT); | |
1262 | if (!event) { | |
1263 | printk(KERN_INFO "Unable to create event %s\n", | |
1264 | probe_desc->event_desc[i]->name); | |
1265 | } | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | ||
33a39a3c MD |
1270 | static |
1271 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1272 | { | |
1273 | int ret; | |
1274 | ||
1275 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1276 | WARN_ON_ONCE(ret); | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * Create struct lttng_event if it is missing and present in the list of | |
1281 | * tracepoint probes. | |
1282 | * Should be called with sessions mutex held. | |
1283 | */ | |
1284 | static | |
1285 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1286 | { | |
1287 | switch (enabler->event_param.instrumentation) { | |
1288 | case LTTNG_KERNEL_TRACEPOINT: | |
1289 | lttng_create_tracepoint_if_missing(enabler); | |
1290 | break; | |
1291 | case LTTNG_KERNEL_SYSCALL: | |
1292 | lttng_create_syscall_if_missing(enabler); | |
1293 | break; | |
1294 | default: | |
1295 | WARN_ON_ONCE(1); | |
1296 | break; | |
1297 | } | |
1298 | } | |
1299 | ||
3c997079 MD |
1300 | /* |
1301 | * Create events associated with an enabler (if not already present), | |
1302 | * and add backward reference from the event to the enabler. | |
1303 | * Should be called with sessions mutex held. | |
1304 | */ | |
1305 | static | |
1306 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1307 | { | |
1308 | struct lttng_session *session = enabler->chan->session; | |
1309 | struct lttng_event *event; | |
1310 | ||
1311 | /* First ensure that probe events are created for this enabler. */ | |
1312 | lttng_create_event_if_missing(enabler); | |
1313 | ||
1314 | /* For each event matching enabler in session event list. */ | |
1315 | list_for_each_entry(event, &session->events, list) { | |
1316 | struct lttng_enabler_ref *enabler_ref; | |
1317 | ||
1318 | if (!lttng_event_match_enabler(event, enabler)) | |
1319 | continue; | |
1320 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1321 | if (!enabler_ref) { | |
1322 | /* | |
1323 | * If no backward ref, create it. | |
1324 | * Add backward ref from event to enabler. | |
1325 | */ | |
1326 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1327 | if (!enabler_ref) | |
1328 | return -ENOMEM; | |
1329 | enabler_ref->ref = enabler; | |
1330 | list_add(&enabler_ref->node, | |
1331 | &event->enablers_ref_head); | |
1332 | } | |
1333 | ||
f127e61e MD |
1334 | /* |
1335 | * Link filter bytecodes if not linked yet. | |
1336 | */ | |
1337 | lttng_enabler_event_link_bytecode(event, enabler); | |
1338 | ||
3c997079 MD |
1339 | /* TODO: merge event context. */ |
1340 | } | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * Called at module load: connect the probe on all enablers matching | |
1346 | * this event. | |
1347 | * Called with sessions lock held. | |
1348 | */ | |
1349 | int lttng_fix_pending_events(void) | |
1350 | { | |
1351 | struct lttng_session *session; | |
1352 | ||
1353 | list_for_each_entry(session, &sessions, list) | |
1354 | lttng_session_lazy_sync_enablers(session); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1359 | struct lttng_kernel_event *event_param, | |
1360 | struct lttng_channel *chan) | |
1361 | { | |
1362 | struct lttng_enabler *enabler; | |
1363 | ||
1364 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1365 | if (!enabler) | |
1366 | return NULL; | |
1367 | enabler->type = type; | |
07dfc1d0 | 1368 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1369 | memcpy(&enabler->event_param, event_param, |
1370 | sizeof(enabler->event_param)); | |
1371 | enabler->chan = chan; | |
1372 | /* ctx left NULL */ | |
4fd19d8a | 1373 | enabler->enabled = 0; |
3c997079 MD |
1374 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1375 | mutex_lock(&sessions_mutex); | |
1376 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1377 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1378 | mutex_unlock(&sessions_mutex); | |
1379 | return enabler; | |
1380 | } | |
1381 | ||
1382 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1383 | { | |
1384 | mutex_lock(&sessions_mutex); | |
1385 | enabler->enabled = 1; | |
1386 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1387 | mutex_unlock(&sessions_mutex); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1392 | { | |
1393 | mutex_lock(&sessions_mutex); | |
1394 | enabler->enabled = 0; | |
1395 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1396 | mutex_unlock(&sessions_mutex); | |
1397 | return 0; | |
1398 | } | |
1399 | ||
07dfc1d0 MD |
1400 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1401 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1402 | { | |
1403 | struct lttng_filter_bytecode_node *bytecode_node; | |
1404 | uint32_t bytecode_len; | |
1405 | int ret; | |
1406 | ||
1407 | ret = get_user(bytecode_len, &bytecode->len); | |
1408 | if (ret) | |
1409 | return ret; | |
1410 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1411 | GFP_KERNEL); | |
1412 | if (!bytecode_node) | |
1413 | return -ENOMEM; | |
1414 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1415 | sizeof(*bytecode) + bytecode_len); | |
1416 | if (ret) | |
1417 | goto error_free; | |
1418 | bytecode_node->enabler = enabler; | |
1419 | /* Enforce length based on allocated size */ | |
1420 | bytecode_node->bc.len = bytecode_len; | |
1421 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1422 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1423 | return 0; | |
1424 | ||
1425 | error_free: | |
1426 | kfree(bytecode_node); | |
1427 | return ret; | |
1428 | } | |
1429 | ||
3c997079 MD |
1430 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1431 | struct lttng_kernel_context *context_param) | |
1432 | { | |
1433 | return -ENOSYS; | |
1434 | } | |
1435 | ||
1436 | static | |
1437 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1438 | { | |
07dfc1d0 MD |
1439 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1440 | ||
1441 | /* Destroy filter bytecode */ | |
1442 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1443 | &enabler->filter_bytecode_head, node) { | |
1444 | kfree(filter_node); | |
1445 | } | |
1446 | ||
3c997079 MD |
1447 | /* Destroy contexts */ |
1448 | lttng_destroy_context(enabler->ctx); | |
1449 | ||
1450 | list_del(&enabler->node); | |
1451 | kfree(enabler); | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * lttng_session_sync_enablers should be called just before starting a | |
1456 | * session. | |
1457 | * Should be called with sessions mutex held. | |
1458 | */ | |
1459 | static | |
1460 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1461 | { | |
1462 | struct lttng_enabler *enabler; | |
1463 | struct lttng_event *event; | |
1464 | ||
1465 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1466 | lttng_enabler_ref_events(enabler); | |
1467 | /* | |
1468 | * For each event, if at least one of its enablers is enabled, | |
1469 | * and its channel and session transient states are enabled, we | |
1470 | * enable the event, else we disable it. | |
1471 | */ | |
1472 | list_for_each_entry(event, &session->events, list) { | |
1473 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1474 | struct lttng_bytecode_runtime *runtime; |
1475 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1476 | |
4ecb5ad5 MD |
1477 | switch (event->instrumentation) { |
1478 | case LTTNG_KERNEL_TRACEPOINT: | |
1479 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1480 | /* Enable events */ |
1481 | list_for_each_entry(enabler_ref, | |
1482 | &event->enablers_ref_head, node) { | |
1483 | if (enabler_ref->ref->enabled) { | |
1484 | enabled = 1; | |
1485 | break; | |
1486 | } | |
1487 | } | |
4ecb5ad5 MD |
1488 | break; |
1489 | default: | |
3c997079 MD |
1490 | /* Not handled with lazy sync. */ |
1491 | continue; | |
1492 | } | |
1493 | /* | |
1494 | * Enabled state is based on union of enablers, with | |
1495 | * intesection of session and channel transient enable | |
1496 | * states. | |
1497 | */ | |
1498 | enabled = enabled && session->tstate && event->chan->tstate; | |
1499 | ||
1500 | ACCESS_ONCE(event->enabled) = enabled; | |
1501 | /* | |
1502 | * Sync tracepoint registration with event enabled | |
1503 | * state. | |
1504 | */ | |
1505 | if (enabled) { | |
1506 | register_event(event); | |
1507 | } else { | |
1508 | _lttng_event_unregister(event); | |
1509 | } | |
07dfc1d0 MD |
1510 | |
1511 | /* Check if has enablers without bytecode enabled */ | |
1512 | list_for_each_entry(enabler_ref, | |
1513 | &event->enablers_ref_head, node) { | |
1514 | if (enabler_ref->ref->enabled | |
1515 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1516 | has_enablers_without_bytecode = 1; | |
1517 | break; | |
1518 | } | |
1519 | } | |
1520 | event->has_enablers_without_bytecode = | |
1521 | has_enablers_without_bytecode; | |
1522 | ||
1523 | /* Enable filters */ | |
1524 | list_for_each_entry(runtime, | |
f127e61e | 1525 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1526 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1527 | } |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Apply enablers to session events, adding events to session if need | |
1532 | * be. It is required after each modification applied to an active | |
1533 | * session, and right before session "start". | |
1534 | * "lazy" sync means we only sync if required. | |
1535 | * Should be called with sessions mutex held. | |
1536 | */ | |
1537 | static | |
1538 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1539 | { | |
1540 | /* We can skip if session is not active */ | |
1541 | if (!session->active) | |
1542 | return; | |
1543 | lttng_session_sync_enablers(session); | |
1544 | } | |
1545 | ||
1ec3f75a | 1546 | /* |
d83004aa JD |
1547 | * Serialize at most one packet worth of metadata into a metadata |
1548 | * channel. | |
92d9f5e6 MD |
1549 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1550 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1551 | * allows us to do racy operations such as looking for remaining space left in | |
1552 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1553 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1554 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1555 | * Returns the number of bytes written in the channel, 0 if no data |
1556 | * was written and a negative value on error. | |
1ec3f75a | 1557 | */ |
b3b8072b MD |
1558 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1559 | struct channel *chan) | |
d83004aa JD |
1560 | { |
1561 | struct lib_ring_buffer_ctx ctx; | |
1562 | int ret = 0; | |
1563 | size_t len, reserve_len; | |
1564 | ||
f613e3e6 | 1565 | /* |
92d9f5e6 MD |
1566 | * Ensure we support mutiple get_next / put sequences followed by |
1567 | * put_next. The metadata cache lock protects reading the metadata | |
1568 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1569 | * "flush" operations on the buffer invoked by different processes. | |
1570 | * Moreover, since the metadata cache memory can be reallocated, we | |
1571 | * need to have exclusive access against updates even though we only | |
1572 | * read it. | |
f613e3e6 | 1573 | */ |
92d9f5e6 | 1574 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1575 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1576 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1577 | goto end; |
f613e3e6 | 1578 | |
9616f0bf JD |
1579 | /* Metadata regenerated, change the version. */ |
1580 | if (stream->metadata_cache->version != stream->version) | |
1581 | stream->version = stream->metadata_cache->version; | |
1582 | ||
d83004aa | 1583 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1584 | stream->metadata_in; |
9de2c215 | 1585 | if (!len) |
de23d59d | 1586 | goto end; |
d83004aa | 1587 | reserve_len = min_t(size_t, |
b3b8072b | 1588 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1589 | len); |
b3b8072b | 1590 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1591 | sizeof(char), -1); |
1592 | /* | |
1593 | * If reservation failed, return an error to the caller. | |
1594 | */ | |
b3b8072b | 1595 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1596 | if (ret != 0) { |
1597 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1598 | goto end; | |
1599 | } | |
b3b8072b | 1600 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1601 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1602 | reserve_len); |
b3b8072b | 1603 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1604 | stream->metadata_in += reserve_len; |
d83004aa JD |
1605 | ret = reserve_len; |
1606 | ||
1607 | end: | |
92d9f5e6 | 1608 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1609 | return ret; |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * Write the metadata to the metadata cache. | |
1614 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1615 | * The metadata cache lock protects us from concurrent read access from |
1616 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1617 | */ |
a90917c3 | 1618 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1619 | const char *fmt, ...) |
1620 | { | |
c099397a | 1621 | char *str; |
d83004aa | 1622 | size_t len; |
c099397a | 1623 | va_list ap; |
d83004aa | 1624 | struct lttng_metadata_stream *stream; |
c099397a MD |
1625 | |
1626 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1627 | ||
1628 | va_start(ap, fmt); | |
1629 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1630 | va_end(ap); | |
1631 | if (!str) | |
1632 | return -ENOMEM; | |
1633 | ||
1ec3f75a | 1634 | len = strlen(str); |
92d9f5e6 | 1635 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1636 | if (session->metadata_cache->metadata_written + len > |
1637 | session->metadata_cache->cache_alloc) { | |
1638 | char *tmp_cache_realloc; | |
1639 | unsigned int tmp_cache_alloc_size; | |
1640 | ||
1641 | tmp_cache_alloc_size = max_t(unsigned int, | |
1642 | session->metadata_cache->cache_alloc + len, | |
1643 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1644 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1645 | if (!tmp_cache_realloc) |
1646 | goto err; | |
a606b6e8 ML |
1647 | if (session->metadata_cache->data) { |
1648 | memcpy(tmp_cache_realloc, | |
1649 | session->metadata_cache->data, | |
1650 | session->metadata_cache->cache_alloc); | |
1651 | vfree(session->metadata_cache->data); | |
1652 | } | |
1653 | ||
d83004aa JD |
1654 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1655 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1656 | } |
d83004aa JD |
1657 | memcpy(session->metadata_cache->data + |
1658 | session->metadata_cache->metadata_written, | |
1659 | str, len); | |
1660 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1661 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1662 | kfree(str); |
d83004aa JD |
1663 | |
1664 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1665 | wake_up_interruptible(&stream->read_wait); | |
1666 | ||
1667 | return 0; | |
1668 | ||
1669 | err: | |
92d9f5e6 | 1670 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1671 | kfree(str); |
1672 | return -ENOMEM; | |
c099397a MD |
1673 | } |
1674 | ||
d83004aa JD |
1675 | /* |
1676 | * Must be called with sessions_mutex held. | |
1677 | */ | |
c099397a | 1678 | static |
a90917c3 | 1679 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 1680 | const struct lttng_event_field *field) |
c099397a | 1681 | { |
c099397a | 1682 | int ret = 0; |
c099397a | 1683 | |
8070f5c0 MD |
1684 | switch (field->type.atype) { |
1685 | case atype_integer: | |
1686 | ret = lttng_metadata_printf(session, | |
244465ab | 1687 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1688 | field->type.u.basic.integer.size, |
1689 | field->type.u.basic.integer.alignment, | |
1690 | field->type.u.basic.integer.signedness, | |
1691 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1692 | ? "none" | |
1693 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1694 | ? "UTF8" | |
1695 | : "ASCII", | |
1696 | field->type.u.basic.integer.base, | |
d669b02d | 1697 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1698 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1699 | #else |
8070f5c0 | 1700 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1701 | #endif |
8070f5c0 MD |
1702 | field->name); |
1703 | break; | |
1704 | case atype_enum: | |
1705 | ret = lttng_metadata_printf(session, | |
244465ab | 1706 | " %s _%s;\n", |
8070f5c0 MD |
1707 | field->type.u.basic.enumeration.name, |
1708 | field->name); | |
1709 | break; | |
1710 | case atype_array: | |
1711 | { | |
1712 | const struct lttng_basic_type *elem_type; | |
1713 | ||
1714 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 MD |
1715 | if (field->type.u.array.elem_alignment) { |
1716 | ret = lttng_metadata_printf(session, | |
1717 | " struct { } align(%u) _%s_padding;\n", | |
1718 | field->type.u.array.elem_alignment * CHAR_BIT, | |
1719 | field->name); | |
1720 | if (ret) | |
1721 | return ret; | |
1722 | } | |
8070f5c0 | 1723 | ret = lttng_metadata_printf(session, |
244465ab | 1724 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1725 | elem_type->u.basic.integer.size, |
1726 | elem_type->u.basic.integer.alignment, | |
1727 | elem_type->u.basic.integer.signedness, | |
1728 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1729 | ? "none" | |
1730 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1731 | ? "UTF8" | |
1732 | : "ASCII", | |
1733 | elem_type->u.basic.integer.base, | |
d669b02d | 1734 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1735 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1736 | #else |
8070f5c0 | 1737 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1738 | #endif |
8070f5c0 MD |
1739 | field->name, field->type.u.array.length); |
1740 | break; | |
1741 | } | |
1742 | case atype_sequence: | |
1743 | { | |
1744 | const struct lttng_basic_type *elem_type; | |
1745 | const struct lttng_basic_type *length_type; | |
1746 | ||
1747 | elem_type = &field->type.u.sequence.elem_type; | |
1748 | length_type = &field->type.u.sequence.length_type; | |
1749 | ret = lttng_metadata_printf(session, | |
1750 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1751 | length_type->u.basic.integer.size, |
32257272 | 1752 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1753 | length_type->u.basic.integer.signedness, |
1754 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1755 | ? "none" | |
0635cdd4 | 1756 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1757 | ? "UTF8" |
0635cdd4 | 1758 | : "ASCII"), |
8070f5c0 | 1759 | length_type->u.basic.integer.base, |
d669b02d | 1760 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1761 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1762 | #else |
0635cdd4 | 1763 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1764 | #endif |
27d2368e MD |
1765 | field->name); |
1766 | if (ret) | |
1767 | return ret; | |
1768 | ||
43803cf2 MD |
1769 | if (field->type.u.sequence.elem_alignment) { |
1770 | ret = lttng_metadata_printf(session, | |
1771 | " struct { } align(%u) _%s_padding;\n", | |
1772 | field->type.u.sequence.elem_alignment * CHAR_BIT, | |
1773 | field->name); | |
1774 | if (ret) | |
1775 | return ret; | |
1776 | } | |
27d2368e | 1777 | ret = lttng_metadata_printf(session, |
244465ab | 1778 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1779 | elem_type->u.basic.integer.size, |
32257272 | 1780 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1781 | elem_type->u.basic.integer.signedness, |
1782 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1783 | ? "none" | |
0635cdd4 | 1784 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1785 | ? "UTF8" |
0635cdd4 | 1786 | : "ASCII"), |
8070f5c0 | 1787 | elem_type->u.basic.integer.base, |
d669b02d | 1788 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1789 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1790 | #else |
8070f5c0 | 1791 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1792 | #endif |
8070f5c0 | 1793 | field->name, |
27d2368e | 1794 | field->name); |
8070f5c0 MD |
1795 | break; |
1796 | } | |
c099397a | 1797 | |
8070f5c0 MD |
1798 | case atype_string: |
1799 | /* Default encoding is UTF8 */ | |
1800 | ret = lttng_metadata_printf(session, | |
244465ab | 1801 | " string%s _%s;\n", |
8070f5c0 MD |
1802 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1803 | " { encoding = ASCII; }" : "", | |
1804 | field->name); | |
1805 | break; | |
1806 | default: | |
1807 | WARN_ON_ONCE(1); | |
1808 | return -EINVAL; | |
1809 | } | |
1810 | return ret; | |
1811 | } | |
1812 | ||
1813 | static | |
a90917c3 | 1814 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1815 | struct lttng_ctx *ctx) |
1816 | { | |
1817 | int ret = 0; | |
1818 | int i; | |
1819 | ||
1820 | if (!ctx) | |
1821 | return 0; | |
1822 | for (i = 0; i < ctx->nr_fields; i++) { | |
1823 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1824 | ||
a90917c3 | 1825 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1826 | if (ret) |
1827 | return ret; | |
1828 | } | |
1829 | return ret; | |
1830 | } | |
1831 | ||
1832 | static | |
a90917c3 MD |
1833 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1834 | struct lttng_event *event) | |
8070f5c0 MD |
1835 | { |
1836 | const struct lttng_event_desc *desc = event->desc; | |
1837 | int ret = 0; | |
1838 | int i; | |
1839 | ||
1840 | for (i = 0; i < desc->nr_fields; i++) { | |
1841 | const struct lttng_event_field *field = &desc->fields[i]; | |
1842 | ||
a90917c3 | 1843 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1844 | if (ret) |
1845 | return ret; | |
c099397a MD |
1846 | } |
1847 | return ret; | |
1848 | } | |
1849 | ||
d83004aa JD |
1850 | /* |
1851 | * Must be called with sessions_mutex held. | |
1852 | */ | |
c099397a | 1853 | static |
a90917c3 MD |
1854 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1855 | struct lttng_channel *chan, | |
1856 | struct lttng_event *event) | |
c099397a MD |
1857 | { |
1858 | int ret = 0; | |
1859 | ||
1860 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1861 | return 0; | |
d83004aa | 1862 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1863 | return 0; |
1864 | ||
1865 | ret = lttng_metadata_printf(session, | |
1866 | "event {\n" | |
ae734547 | 1867 | " name = \"%s\";\n" |
c099397a | 1868 | " id = %u;\n" |
b9074a1b | 1869 | " stream_id = %u;\n", |
c099397a MD |
1870 | event->desc->name, |
1871 | event->id, | |
1872 | event->chan->id); | |
1873 | if (ret) | |
1874 | goto end; | |
1875 | ||
b9074a1b MD |
1876 | if (event->ctx) { |
1877 | ret = lttng_metadata_printf(session, | |
1878 | " context := struct {\n"); | |
1879 | if (ret) | |
1880 | goto end; | |
1881 | } | |
a90917c3 | 1882 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1883 | if (ret) |
1884 | goto end; | |
b9074a1b MD |
1885 | if (event->ctx) { |
1886 | ret = lttng_metadata_printf(session, | |
1887 | " };\n"); | |
1888 | if (ret) | |
1889 | goto end; | |
1890 | } | |
8070f5c0 MD |
1891 | |
1892 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1893 | " fields := struct {\n" |
1894 | ); | |
1895 | if (ret) | |
1896 | goto end; | |
1897 | ||
a90917c3 | 1898 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1899 | if (ret) |
1900 | goto end; | |
1901 | ||
1902 | /* | |
1903 | * LTTng space reservation can only reserve multiples of the | |
1904 | * byte size. | |
1905 | */ | |
1906 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1907 | " };\n" |
1908 | "};\n\n"); | |
c099397a MD |
1909 | if (ret) |
1910 | goto end; | |
1911 | ||
c099397a MD |
1912 | event->metadata_dumped = 1; |
1913 | end: | |
1914 | return ret; | |
1915 | ||
1916 | } | |
1917 | ||
d83004aa JD |
1918 | /* |
1919 | * Must be called with sessions_mutex held. | |
1920 | */ | |
c099397a | 1921 | static |
a90917c3 MD |
1922 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1923 | struct lttng_channel *chan) | |
c099397a MD |
1924 | { |
1925 | int ret = 0; | |
1926 | ||
1927 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1928 | return 0; | |
d83004aa JD |
1929 | |
1930 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1931 | return 0; |
1932 | ||
1933 | WARN_ON_ONCE(!chan->header_type); | |
1934 | ret = lttng_metadata_printf(session, | |
1935 | "stream {\n" | |
1936 | " id = %u;\n" | |
9115fbdc | 1937 | " event.header := %s;\n" |
b9074a1b | 1938 | " packet.context := struct packet_context;\n", |
c099397a MD |
1939 | chan->id, |
1940 | chan->header_type == 1 ? "struct event_header_compact" : | |
1941 | "struct event_header_large"); | |
1942 | if (ret) | |
1943 | goto end; | |
1944 | ||
b9074a1b MD |
1945 | if (chan->ctx) { |
1946 | ret = lttng_metadata_printf(session, | |
1947 | " event.context := struct {\n"); | |
1948 | if (ret) | |
1949 | goto end; | |
1950 | } | |
a90917c3 | 1951 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1952 | if (ret) |
1953 | goto end; | |
b9074a1b MD |
1954 | if (chan->ctx) { |
1955 | ret = lttng_metadata_printf(session, | |
1956 | " };\n"); | |
1957 | if (ret) | |
1958 | goto end; | |
1959 | } | |
8070f5c0 MD |
1960 | |
1961 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1962 | "};\n\n"); |
8070f5c0 | 1963 | |
c099397a MD |
1964 | chan->metadata_dumped = 1; |
1965 | end: | |
1966 | return ret; | |
1967 | } | |
1968 | ||
d83004aa JD |
1969 | /* |
1970 | * Must be called with sessions_mutex held. | |
1971 | */ | |
9115fbdc | 1972 | static |
a90917c3 | 1973 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1974 | { |
1975 | return lttng_metadata_printf(session, | |
1976 | "struct packet_context {\n" | |
a3ccff4f MD |
1977 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1978 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1979 | " uint64_t content_size;\n" |
1980 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 1981 | " uint64_t packet_seq_num;\n" |
a9afe705 | 1982 | " unsigned long events_discarded;\n" |
9115fbdc | 1983 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1984 | "};\n\n" |
9115fbdc MD |
1985 | ); |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Compact header: | |
1990 | * id: range: 0 - 30. | |
1991 | * id 31 is reserved to indicate an extended header. | |
1992 | * | |
1993 | * Large header: | |
1994 | * id: range: 0 - 65534. | |
1995 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1996 | * |
1997 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1998 | */ |
1999 | static | |
a90917c3 | 2000 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2001 | { |
2002 | return lttng_metadata_printf(session, | |
2003 | "struct event_header_compact {\n" | |
2004 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2005 | " variant <id> {\n" | |
2006 | " struct {\n" | |
a3ccff4f | 2007 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2008 | " } compact;\n" |
2009 | " struct {\n" | |
2010 | " uint32_t id;\n" | |
a3ccff4f | 2011 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2012 | " } extended;\n" |
2013 | " } v;\n" | |
2014 | "} align(%u);\n" | |
2015 | "\n" | |
2016 | "struct event_header_large {\n" | |
2017 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2018 | " variant <id> {\n" | |
2019 | " struct {\n" | |
a3ccff4f | 2020 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2021 | " } compact;\n" |
2022 | " struct {\n" | |
2023 | " uint32_t id;\n" | |
a3ccff4f | 2024 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2025 | " } extended;\n" |
2026 | " } v;\n" | |
2027 | "} align(%u);\n\n", | |
a90917c3 MD |
2028 | lttng_alignof(uint32_t) * CHAR_BIT, |
2029 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2030 | ); |
2031 | } | |
2032 | ||
a3ccff4f MD |
2033 | /* |
2034 | * Approximation of NTP time of day to clock monotonic correlation, | |
2035 | * taken at start of trace. | |
2036 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2037 | * in future versions. | |
5283350b MD |
2038 | * This function may return a negative offset. It may happen if the |
2039 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2040 | */ |
2041 | static | |
8967b2a3 | 2042 | int64_t measure_clock_offset(void) |
a3ccff4f | 2043 | { |
dcb93448 | 2044 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2045 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2046 | int64_t offset; |
a3ccff4f MD |
2047 | struct timespec rts = { 0, 0 }; |
2048 | unsigned long flags; | |
2049 | ||
2050 | /* Disable interrupts to increase correlation precision. */ | |
2051 | local_irq_save(flags); | |
2052 | monotonic[0] = trace_clock_read64(); | |
2053 | getnstimeofday(&rts); | |
2054 | monotonic[1] = trace_clock_read64(); | |
2055 | local_irq_restore(flags); | |
2056 | ||
dcb93448 | 2057 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2058 | realtime = (uint64_t) rts.tv_sec * tcf; |
2059 | if (tcf == NSEC_PER_SEC) { | |
2060 | realtime += rts.tv_nsec; | |
2061 | } else { | |
2062 | uint64_t n = rts.tv_nsec * tcf; | |
2063 | ||
2064 | do_div(n, NSEC_PER_SEC); | |
2065 | realtime += n; | |
2066 | } | |
dcb93448 | 2067 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2068 | return offset; |
2069 | } | |
2070 | ||
c099397a MD |
2071 | /* |
2072 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2073 | * Must be called with sessions_mutex held. |
c099397a MD |
2074 | */ |
2075 | static | |
a90917c3 | 2076 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2077 | { |
30bdb6e4 | 2078 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2079 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2080 | struct lttng_channel *chan; |
2081 | struct lttng_event *event; | |
c099397a MD |
2082 | int ret = 0; |
2083 | ||
2084 | if (!ACCESS_ONCE(session->active)) | |
2085 | return 0; | |
2086 | if (session->metadata_dumped) | |
2087 | goto skip_session; | |
c099397a | 2088 | |
d793d5e1 | 2089 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2090 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2091 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2092 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2093 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2094 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2095 | |
2096 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2097 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2098 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2099 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2100 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2101 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2102 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2103 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2104 | "\n" |
2105 | "trace {\n" | |
2106 | " major = %u;\n" | |
2107 | " minor = %u;\n" | |
30bdb6e4 | 2108 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2109 | " byte_order = %s;\n" |
2110 | " packet.header := struct {\n" | |
2111 | " uint32_t magic;\n" | |
1ec3f75a | 2112 | " uint8_t uuid[16];\n" |
d793d5e1 | 2113 | " uint32_t stream_id;\n" |
5594698f | 2114 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2115 | " };\n" |
d793d5e1 | 2116 | "};\n\n", |
a90917c3 MD |
2117 | lttng_alignof(uint8_t) * CHAR_BIT, |
2118 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2119 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2120 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2121 | sizeof(unsigned long) * CHAR_BIT, |
2122 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2123 | CTF_SPEC_MAJOR, |
2124 | CTF_SPEC_MINOR, | |
d793d5e1 | 2125 | uuid_s, |
d669b02d | 2126 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2127 | "be" |
2128 | #else | |
2129 | "le" | |
2130 | #endif | |
2131 | ); | |
2132 | if (ret) | |
2133 | goto end; | |
2134 | ||
99dc9597 MD |
2135 | ret = lttng_metadata_printf(session, |
2136 | "env {\n" | |
a6058143 | 2137 | " hostname = \"%s\";\n" |
c6c9e10f | 2138 | " domain = \"kernel\";\n" |
99dc9597 | 2139 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2140 | " kernel_release = \"%s\";\n" |
2141 | " kernel_version = \"%s\";\n" | |
2142 | " tracer_name = \"lttng-modules\";\n" | |
2143 | " tracer_major = %d;\n" | |
2144 | " tracer_minor = %d;\n" | |
2145 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2146 | "};\n\n", |
3d0d43db | 2147 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2148 | utsname()->sysname, |
2149 | utsname()->release, | |
c6c9e10f MD |
2150 | utsname()->version, |
2151 | LTTNG_MODULES_MAJOR_VERSION, | |
2152 | LTTNG_MODULES_MINOR_VERSION, | |
2153 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2154 | ); |
2155 | if (ret) | |
2156 | goto end; | |
2157 | ||
a3ccff4f MD |
2158 | ret = lttng_metadata_printf(session, |
2159 | "clock {\n" | |
2754583e MD |
2160 | " name = \"%s\";\n", |
2161 | trace_clock_name() | |
a82c63f1 MD |
2162 | ); |
2163 | if (ret) | |
2164 | goto end; | |
2165 | ||
2166 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2167 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2168 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2169 | clock_uuid_s |
2170 | ); | |
2171 | if (ret) | |
2172 | goto end; | |
2173 | } | |
2174 | ||
2175 | ret = lttng_metadata_printf(session, | |
2754583e | 2176 | " description = \"%s\";\n" |
a3ccff4f MD |
2177 | " freq = %llu; /* Frequency, in Hz */\n" |
2178 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2179 | " offset = %lld;\n" |
a3ccff4f | 2180 | "};\n\n", |
2754583e | 2181 | trace_clock_description(), |
a3ccff4f | 2182 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2183 | (long long) measure_clock_offset() |
a3ccff4f MD |
2184 | ); |
2185 | if (ret) | |
2186 | goto end; | |
2187 | ||
2188 | ret = lttng_metadata_printf(session, | |
2189 | "typealias integer {\n" | |
2190 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2191 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2192 | "} := uint27_clock_monotonic_t;\n" |
2193 | "\n" | |
2194 | "typealias integer {\n" | |
2195 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2196 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2197 | "} := uint32_clock_monotonic_t;\n" |
2198 | "\n" | |
2199 | "typealias integer {\n" | |
2200 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2201 | " map = clock.%s.value;\n" |
a3ccff4f | 2202 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2203 | trace_clock_name(), |
a3ccff4f | 2204 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2205 | trace_clock_name(), |
2206 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2207 | trace_clock_name() | |
a3ccff4f MD |
2208 | ); |
2209 | if (ret) | |
2210 | goto end; | |
2211 | ||
a90917c3 | 2212 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2213 | if (ret) |
2214 | goto end; | |
2215 | ||
a90917c3 | 2216 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2217 | if (ret) |
2218 | goto end; | |
2219 | ||
c099397a MD |
2220 | skip_session: |
2221 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2222 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2223 | if (ret) |
2224 | goto end; | |
2225 | } | |
2226 | ||
2227 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2228 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2229 | if (ret) |
2230 | goto end; | |
2231 | } | |
2232 | session->metadata_dumped = 1; | |
2233 | end: | |
2234 | return ret; | |
2235 | } | |
2236 | ||
c0e31d2e | 2237 | /** |
a90917c3 | 2238 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2239 | * @transport: transport structure |
2240 | * | |
2241 | * Registers a transport which can be used as output to extract the data out of | |
2242 | * LTTng. The module calling this registration function must ensure that no | |
2243 | * trap-inducing code will be executed by the transport functions. E.g. | |
2244 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2245 | * is made visible to the transport function. This registration acts as a | |
2246 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2247 | * after its registration must it synchronize the TLBs. | |
2248 | */ | |
a90917c3 | 2249 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2250 | { |
2251 | /* | |
2252 | * Make sure no page fault can be triggered by the module about to be | |
2253 | * registered. We deal with this here so we don't have to call | |
2254 | * vmalloc_sync_all() in each module's init. | |
2255 | */ | |
6d2a620c | 2256 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2257 | |
2258 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2259 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2260 | mutex_unlock(&sessions_mutex); |
2261 | } | |
a90917c3 | 2262 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2263 | |
2264 | /** | |
a90917c3 | 2265 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2266 | * @transport: transport structure |
2267 | */ | |
a90917c3 | 2268 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2269 | { |
2270 | mutex_lock(&sessions_mutex); | |
2271 | list_del(&transport->node); | |
2272 | mutex_unlock(&sessions_mutex); | |
2273 | } | |
a90917c3 | 2274 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2275 | |
a90917c3 | 2276 | static int __init lttng_events_init(void) |
4e3c1b9b | 2277 | { |
1c25284c MD |
2278 | int ret; |
2279 | ||
453b2495 JD |
2280 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2281 | if (ret) | |
2282 | return ret; | |
389d7070 | 2283 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2284 | if (ret) |
2285 | return ret; | |
2286 | ret = wrapper_get_pageblock_flags_mask_init(); | |
389d7070 MD |
2287 | if (ret) |
2288 | return ret; | |
07dfc1d0 | 2289 | ret = lttng_context_init(); |
20591cf7 MD |
2290 | if (ret) |
2291 | return ret; | |
07dfc1d0 MD |
2292 | ret = lttng_tracepoint_init(); |
2293 | if (ret) | |
2294 | goto error_tp; | |
a90917c3 | 2295 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2296 | if (!event_cache) { |
2297 | ret = -ENOMEM; | |
2298 | goto error_kmem; | |
2299 | } | |
80996790 | 2300 | ret = lttng_abi_init(); |
02119ee5 MD |
2301 | if (ret) |
2302 | goto error_abi; | |
0c956676 MD |
2303 | ret = lttng_logger_init(); |
2304 | if (ret) | |
2305 | goto error_logger; | |
4e3c1b9b | 2306 | return 0; |
0c956676 MD |
2307 | |
2308 | error_logger: | |
2309 | lttng_abi_exit(); | |
02119ee5 | 2310 | error_abi: |
1c25284c | 2311 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2312 | error_kmem: |
2313 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2314 | error_tp: |
2315 | lttng_context_exit(); | |
1c25284c | 2316 | return ret; |
4e3c1b9b MD |
2317 | } |
2318 | ||
a90917c3 | 2319 | module_init(lttng_events_init); |
11b5a3c2 | 2320 | |
a90917c3 | 2321 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2322 | { |
a90917c3 | 2323 | struct lttng_session *session, *tmpsession; |
92e94819 | 2324 | |
0c956676 | 2325 | lttng_logger_exit(); |
80996790 | 2326 | lttng_abi_exit(); |
92e94819 | 2327 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2328 | lttng_session_destroy(session); |
11b5a3c2 | 2329 | kmem_cache_destroy(event_cache); |
20591cf7 | 2330 | lttng_tracepoint_exit(); |
07dfc1d0 | 2331 | lttng_context_exit(); |
4e3c1b9b | 2332 | } |
92e94819 | 2333 | |
a90917c3 | 2334 | module_exit(lttng_events_exit); |
11b5a3c2 | 2335 | |
92e94819 MD |
2336 | MODULE_LICENSE("GPL and additional rights"); |
2337 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2338 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2339 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2340 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2341 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2342 | LTTNG_MODULES_EXTRAVERSION); |