Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
3c997079 | 27 | #include <linux/jhash.h> |
8c6e7f13 | 28 | #include <linux/uaccess.h> |
a606b6e8 | 29 | #include <linux/vmalloc.h> |
8a107a42 | 30 | #include <linux/uuid.h> |
3c997079 | 31 | |
dc61cb20 | 32 | #include <wrapper/uuid.h> |
da0fcb14 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
241ae9a8 MD |
38 | #include <lttng-kernel-version.h> |
39 | #include <lttng-events.h> | |
40 | #include <lttng-tracer.h> | |
41 | #include <lttng-abi-old.h> | |
5214fa50 | 42 | #include <lttng-endian.h> |
4993071a | 43 | #include <lttng-string-utils.h> |
241ae9a8 | 44 | #include <wrapper/vzalloc.h> |
64af2437 MD |
45 | #include <wrapper/ringbuffer/backend.h> |
46 | #include <wrapper/ringbuffer/frontend.h> | |
25cc7051 | 47 | #include <wrapper/time.h> |
4e3c1b9b | 48 | |
d83004aa JD |
49 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
50 | ||
4e3c1b9b | 51 | static LIST_HEAD(sessions); |
a90917c3 | 52 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
53 | /* |
54 | * Protect the sessions and metadata caches. | |
55 | */ | |
4e3c1b9b MD |
56 | static DEFINE_MUTEX(sessions_mutex); |
57 | static struct kmem_cache *event_cache; | |
58 | ||
3c997079 MD |
59 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
60 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
61 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
62 | ||
a90917c3 MD |
63 | static void _lttng_event_destroy(struct lttng_event *event); |
64 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
65 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 66 | static |
a90917c3 MD |
67 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
68 | struct lttng_channel *chan, | |
69 | struct lttng_event *event); | |
c099397a | 70 | static |
a90917c3 | 71 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
72 | static |
73 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
74 | static |
75 | int _lttng_field_statedump(struct lttng_session *session, | |
76 | const struct lttng_event_field *field, | |
77 | size_t nesting); | |
c099397a | 78 | |
c099397a | 79 | void synchronize_trace(void) |
abcca994 | 80 | { |
46e6a937 MJ |
81 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
82 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
f4a8ec4d MJ |
83 | synchronize_rcu(); |
84 | #else | |
abcca994 | 85 | synchronize_sched(); |
f4a8ec4d MJ |
86 | #endif |
87 | ||
b78104db | 88 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
89 | #ifdef CONFIG_PREEMPT_RT_FULL |
90 | synchronize_rcu(); | |
91 | #endif | |
b78104db | 92 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
93 | #ifdef CONFIG_PREEMPT_RT |
94 | synchronize_rcu(); | |
95 | #endif | |
b78104db | 96 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
97 | } |
98 | ||
3c997079 MD |
99 | void lttng_lock_sessions(void) |
100 | { | |
101 | mutex_lock(&sessions_mutex); | |
102 | } | |
103 | ||
104 | void lttng_unlock_sessions(void) | |
105 | { | |
106 | mutex_unlock(&sessions_mutex); | |
107 | } | |
108 | ||
109 | /* | |
110 | * Called with sessions lock held. | |
111 | */ | |
112 | int lttng_session_active(void) | |
113 | { | |
114 | struct lttng_session *iter; | |
115 | ||
116 | list_for_each_entry(iter, &sessions, list) { | |
117 | if (iter->active) | |
118 | return 1; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
a90917c3 | 123 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 124 | { |
a90917c3 | 125 | struct lttng_session *session; |
d83004aa | 126 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 127 | int i; |
4e3c1b9b MD |
128 | |
129 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 130 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 131 | if (!session) |
d83004aa | 132 | goto err; |
4e3c1b9b | 133 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 134 | INIT_LIST_HEAD(&session->events); |
dc61cb20 | 135 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
136 | |
137 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
138 | GFP_KERNEL); | |
139 | if (!metadata_cache) | |
140 | goto err_free_session; | |
f6da044f | 141 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
142 | if (!metadata_cache->data) |
143 | goto err_free_cache; | |
144 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
145 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 146 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
147 | session->metadata_cache = metadata_cache; |
148 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
149 | memcpy(&metadata_cache->uuid, &session->uuid, |
150 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
151 | INIT_LIST_HEAD(&session->enablers_head); |
152 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
153 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
154 | list_add(&session->list, &sessions); |
155 | mutex_unlock(&sessions_mutex); | |
156 | return session; | |
d83004aa JD |
157 | |
158 | err_free_cache: | |
159 | kfree(metadata_cache); | |
160 | err_free_session: | |
48f5e0b5 | 161 | lttng_kvfree(session); |
d83004aa JD |
162 | err: |
163 | mutex_unlock(&sessions_mutex); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | void metadata_cache_destroy(struct kref *kref) | |
168 | { | |
169 | struct lttng_metadata_cache *cache = | |
170 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 171 | vfree(cache->data); |
d83004aa | 172 | kfree(cache); |
4e3c1b9b MD |
173 | } |
174 | ||
a90917c3 | 175 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 176 | { |
a90917c3 MD |
177 | struct lttng_channel *chan, *tmpchan; |
178 | struct lttng_event *event, *tmpevent; | |
d83004aa | 179 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 180 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 181 | int ret; |
4e3c1b9b MD |
182 | |
183 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 184 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
185 | list_for_each_entry(chan, &session->chan, list) { |
186 | ret = lttng_syscalls_unregister(chan); | |
187 | WARN_ON(ret); | |
188 | } | |
dda6a249 | 189 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 190 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
191 | WARN_ON(ret); |
192 | } | |
abcca994 | 193 | synchronize_trace(); /* Wait for in-flight events to complete */ |
e298d6af MD |
194 | list_for_each_entry(chan, &session->chan, list) { |
195 | ret = lttng_syscalls_destroy(chan); | |
196 | WARN_ON(ret); | |
197 | } | |
3c997079 MD |
198 | list_for_each_entry_safe(enabler, tmpenabler, |
199 | &session->enablers_head, node) | |
200 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 201 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 202 | _lttng_event_destroy(event); |
d83004aa JD |
203 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
204 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 205 | _lttng_channel_destroy(chan); |
d83004aa | 206 | } |
b8363d6a | 207 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
208 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
209 | _lttng_metadata_channel_hangup(metadata_stream); | |
b8363d6a | 210 | mutex_unlock(&session->metadata_cache->lock); |
e0130fab MD |
211 | if (session->pid_tracker) |
212 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 213 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
214 | list_del(&session->list); |
215 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 216 | lttng_kvfree(session); |
4e3c1b9b MD |
217 | } |
218 | ||
601252cf MD |
219 | int lttng_session_statedump(struct lttng_session *session) |
220 | { | |
221 | int ret; | |
222 | ||
223 | mutex_lock(&sessions_mutex); | |
224 | ret = lttng_statedump_start(session); | |
225 | mutex_unlock(&sessions_mutex); | |
226 | return ret; | |
227 | } | |
228 | ||
a90917c3 | 229 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
230 | { |
231 | int ret = 0; | |
a90917c3 | 232 | struct lttng_channel *chan; |
c0e31d2e MD |
233 | |
234 | mutex_lock(&sessions_mutex); | |
235 | if (session->active) { | |
236 | ret = -EBUSY; | |
237 | goto end; | |
238 | } | |
c099397a | 239 | |
3c997079 MD |
240 | /* Set transient enabler state to "enabled" */ |
241 | session->tstate = 1; | |
242 | ||
c099397a MD |
243 | /* |
244 | * Snapshot the number of events per channel to know the type of header | |
245 | * we need to use. | |
246 | */ | |
247 | list_for_each_entry(chan, &session->chan, list) { | |
248 | if (chan->header_type) | |
249 | continue; /* don't change it if session stop/restart */ | |
250 | if (chan->free_event_id < 31) | |
251 | chan->header_type = 1; /* compact */ | |
252 | else | |
253 | chan->header_type = 2; /* large */ | |
254 | } | |
255 | ||
3c997079 MD |
256 | /* We need to sync enablers with session before activation. */ |
257 | lttng_session_sync_enablers(session); | |
258 | ||
64af2437 | 259 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
260 | list_for_each_entry(chan, &session->chan, list) { |
261 | if (chan->channel_type != METADATA_CHANNEL) | |
262 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
263 | } | |
64af2437 | 264 | |
a8f2d0c7 MJ |
265 | WRITE_ONCE(session->active, 1); |
266 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 267 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 268 | if (ret) { |
a8f2d0c7 | 269 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
270 | goto end; |
271 | } | |
272 | ret = lttng_statedump_start(session); | |
360f38ea | 273 | if (ret) |
a8f2d0c7 | 274 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
275 | end: |
276 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 277 | return ret; |
c0e31d2e MD |
278 | } |
279 | ||
a90917c3 | 280 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
281 | { |
282 | int ret = 0; | |
64af2437 | 283 | struct lttng_channel *chan; |
c0e31d2e MD |
284 | |
285 | mutex_lock(&sessions_mutex); | |
286 | if (!session->active) { | |
287 | ret = -EBUSY; | |
288 | goto end; | |
289 | } | |
a8f2d0c7 | 290 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
291 | |
292 | /* Set transient enabler state to "disabled" */ | |
293 | session->tstate = 0; | |
294 | lttng_session_sync_enablers(session); | |
64af2437 MD |
295 | |
296 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
297 | list_for_each_entry(chan, &session->chan, list) { |
298 | if (chan->channel_type != METADATA_CHANNEL) | |
299 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
300 | } | |
c0e31d2e MD |
301 | end: |
302 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 303 | return ret; |
c0e31d2e MD |
304 | } |
305 | ||
9616f0bf JD |
306 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
307 | { | |
308 | int ret = 0; | |
309 | struct lttng_channel *chan; | |
310 | struct lttng_event *event; | |
311 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
312 | struct lttng_metadata_stream *stream; | |
313 | ||
314 | mutex_lock(&sessions_mutex); | |
315 | if (!session->active) { | |
316 | ret = -EBUSY; | |
317 | goto end; | |
318 | } | |
319 | ||
320 | mutex_lock(&cache->lock); | |
321 | memset(cache->data, 0, cache->cache_alloc); | |
322 | cache->metadata_written = 0; | |
323 | cache->version++; | |
324 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
325 | stream->metadata_out = 0; | |
326 | stream->metadata_in = 0; | |
327 | } | |
328 | mutex_unlock(&cache->lock); | |
329 | ||
330 | session->metadata_dumped = 0; | |
331 | list_for_each_entry(chan, &session->chan, list) { | |
332 | chan->metadata_dumped = 0; | |
333 | } | |
334 | ||
335 | list_for_each_entry(event, &session->events, list) { | |
336 | event->metadata_dumped = 0; | |
337 | } | |
338 | ||
339 | ret = _lttng_session_metadata_statedump(session); | |
340 | ||
341 | end: | |
342 | mutex_unlock(&sessions_mutex); | |
343 | return ret; | |
344 | } | |
345 | ||
a90917c3 | 346 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 347 | { |
3c997079 | 348 | int ret = 0; |
e64957da | 349 | |
3c997079 MD |
350 | mutex_lock(&sessions_mutex); |
351 | if (channel->channel_type == METADATA_CHANNEL) { | |
352 | ret = -EPERM; | |
353 | goto end; | |
354 | } | |
355 | if (channel->enabled) { | |
356 | ret = -EEXIST; | |
357 | goto end; | |
358 | } | |
359 | /* Set transient enabler state to "enabled" */ | |
360 | channel->tstate = 1; | |
361 | lttng_session_sync_enablers(channel->session); | |
362 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 363 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
364 | end: |
365 | mutex_unlock(&sessions_mutex); | |
366 | return ret; | |
e64957da MD |
367 | } |
368 | ||
a90917c3 | 369 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 370 | { |
3c997079 | 371 | int ret = 0; |
e64957da | 372 | |
3c997079 MD |
373 | mutex_lock(&sessions_mutex); |
374 | if (channel->channel_type == METADATA_CHANNEL) { | |
375 | ret = -EPERM; | |
376 | goto end; | |
377 | } | |
378 | if (!channel->enabled) { | |
379 | ret = -EEXIST; | |
380 | goto end; | |
381 | } | |
382 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 383 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
384 | /* Set transient enabler state to "enabled" */ |
385 | channel->tstate = 0; | |
386 | lttng_session_sync_enablers(channel->session); | |
387 | end: | |
388 | mutex_unlock(&sessions_mutex); | |
389 | return ret; | |
e64957da MD |
390 | } |
391 | ||
a90917c3 | 392 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 393 | { |
3c997079 | 394 | int ret = 0; |
e64957da | 395 | |
3c997079 MD |
396 | mutex_lock(&sessions_mutex); |
397 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
398 | ret = -EPERM; | |
399 | goto end; | |
400 | } | |
401 | if (event->enabled) { | |
402 | ret = -EEXIST; | |
403 | goto end; | |
404 | } | |
a0493bef MD |
405 | switch (event->instrumentation) { |
406 | case LTTNG_KERNEL_TRACEPOINT: | |
407 | case LTTNG_KERNEL_SYSCALL: | |
408 | ret = -EINVAL; | |
409 | break; | |
410 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 411 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 412 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 413 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
414 | break; |
415 | case LTTNG_KERNEL_KRETPROBE: | |
416 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
417 | break; | |
853aee81 | 418 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
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: | |
149b9a9d | 447 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 448 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 449 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
450 | break; |
451 | case LTTNG_KERNEL_KRETPROBE: | |
452 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
453 | break; | |
853aee81 | 454 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
455 | default: |
456 | WARN_ON_ONCE(1); | |
457 | ret = -EINVAL; | |
458 | } | |
3c997079 MD |
459 | end: |
460 | mutex_unlock(&sessions_mutex); | |
461 | return ret; | |
e64957da MD |
462 | } |
463 | ||
a90917c3 | 464 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 465 | { |
a90917c3 | 466 | struct lttng_transport *transport; |
f3d01b96 | 467 | |
a90917c3 | 468 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
469 | if (!strcmp(transport->name, name)) |
470 | return transport; | |
471 | } | |
472 | return NULL; | |
473 | } | |
474 | ||
a90917c3 | 475 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
476 | const char *transport_name, |
477 | void *buf_addr, | |
4e3c1b9b MD |
478 | size_t subbuf_size, size_t num_subbuf, |
479 | unsigned int switch_timer_interval, | |
d83004aa JD |
480 | unsigned int read_timer_interval, |
481 | enum channel_type channel_type) | |
4e3c1b9b | 482 | { |
a90917c3 MD |
483 | struct lttng_channel *chan; |
484 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
485 | |
486 | mutex_lock(&sessions_mutex); | |
d83004aa | 487 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 488 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 489 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
490 | if (!transport) { |
491 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
492 | transport_name); | |
c0e31d2e | 493 | goto notransport; |
f3d01b96 | 494 | } |
a33c9927 MD |
495 | if (!try_module_get(transport->owner)) { |
496 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
497 | goto notransport; | |
498 | } | |
a90917c3 | 499 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 500 | if (!chan) |
c0e31d2e | 501 | goto nomem; |
4e3c1b9b | 502 | chan->session = session; |
05d32c64 | 503 | chan->id = session->free_chan_id++; |
3b731ab1 | 504 | chan->ops = &transport->ops; |
125b4df4 MD |
505 | /* |
506 | * Note: the channel creation op already writes into the packet | |
507 | * headers. Therefore the "chan" information used as input | |
508 | * should be already accessible. | |
509 | */ | |
5f5ddf01 MD |
510 | chan->chan = transport->ops.channel_create(transport_name, |
511 | chan, buf_addr, subbuf_size, num_subbuf, | |
512 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
513 | if (!chan->chan) |
514 | goto create_error; | |
3c997079 | 515 | chan->tstate = 1; |
e64957da | 516 | chan->enabled = 1; |
a33c9927 | 517 | chan->transport = transport; |
d83004aa | 518 | chan->channel_type = channel_type; |
4e3c1b9b MD |
519 | list_add(&chan->list, &session->chan); |
520 | mutex_unlock(&sessions_mutex); | |
521 | return chan; | |
522 | ||
f3d01b96 MD |
523 | create_error: |
524 | kfree(chan); | |
c0e31d2e | 525 | nomem: |
a33c9927 MD |
526 | if (transport) |
527 | module_put(transport->owner); | |
c0e31d2e | 528 | notransport: |
e5382b6d | 529 | active: |
4e3c1b9b MD |
530 | mutex_unlock(&sessions_mutex); |
531 | return NULL; | |
532 | } | |
533 | ||
534 | /* | |
d83004aa JD |
535 | * Only used internally at session destruction for per-cpu channels, and |
536 | * when metadata channel is released. | |
537 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 538 | */ |
aa7c23a9 | 539 | static |
a90917c3 | 540 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 541 | { |
11b5a3c2 | 542 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 543 | module_put(chan->transport->owner); |
4e3c1b9b | 544 | list_del(&chan->list); |
8070f5c0 | 545 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
546 | kfree(chan); |
547 | } | |
548 | ||
d83004aa JD |
549 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
550 | { | |
551 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
552 | ||
553 | /* Protect the metadata cache with the sessions_mutex. */ | |
554 | mutex_lock(&sessions_mutex); | |
555 | _lttng_channel_destroy(chan); | |
556 | mutex_unlock(&sessions_mutex); | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
559 | ||
560 | static | |
561 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
562 | { | |
563 | stream->finalized = 1; | |
564 | wake_up_interruptible(&stream->read_wait); | |
565 | } | |
566 | ||
e5382b6d MD |
567 | /* |
568 | * Supports event creation while tracing session is active. | |
3c997079 | 569 | * Needs to be called with sessions mutex held. |
e5382b6d | 570 | */ |
3c997079 MD |
571 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
572 | struct lttng_kernel_event *event_param, | |
573 | void *filter, | |
574 | const struct lttng_event_desc *event_desc, | |
575 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 576 | { |
3c997079 | 577 | struct lttng_session *session = chan->session; |
a90917c3 | 578 | struct lttng_event *event; |
3c997079 MD |
579 | const char *event_name; |
580 | struct hlist_head *head; | |
581 | size_t name_len; | |
582 | uint32_t hash; | |
3d084699 | 583 | int ret; |
4e3c1b9b | 584 | |
abc0446a | 585 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 586 | ret = -EMFILE; |
e5382b6d | 587 | goto full; |
abc0446a | 588 | } |
3c997079 MD |
589 | |
590 | switch (itype) { | |
591 | case LTTNG_KERNEL_TRACEPOINT: | |
592 | event_name = event_desc->name; | |
593 | break; | |
594 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 595 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 596 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 597 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 598 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
599 | event_name = event_param->name; |
600 | break; | |
853aee81 | 601 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
602 | default: |
603 | WARN_ON_ONCE(1); | |
604 | ret = -EINVAL; | |
605 | goto type_error; | |
606 | } | |
607 | name_len = strlen(event_name); | |
608 | hash = jhash(event_name, name_len, 0); | |
609 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 610 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
611 | WARN_ON_ONCE(!event->desc); |
612 | if (!strncmp(event->desc->name, event_name, | |
613 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
614 | && chan == event->chan) { | |
615 | ret = -EEXIST; | |
616 | goto exist; | |
abc0446a MD |
617 | } |
618 | } | |
3c997079 | 619 | |
11b5a3c2 | 620 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 621 | if (!event) { |
4cf0bf51 | 622 | ret = -ENOMEM; |
4e3c1b9b | 623 | goto cache_error; |
abc0446a | 624 | } |
4e3c1b9b MD |
625 | event->chan = chan; |
626 | event->filter = filter; | |
e5382b6d | 627 | event->id = chan->free_event_id++; |
3c997079 MD |
628 | event->instrumentation = itype; |
629 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 630 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
631 | INIT_LIST_HEAD(&event->enablers_ref_head); |
632 | ||
633 | switch (itype) { | |
ab2277d6 | 634 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
635 | /* Event will be enabled by enabler sync. */ |
636 | event->enabled = 0; | |
637 | event->registered = 0; | |
638 | event->desc = lttng_event_get(event_name); | |
abc0446a | 639 | if (!event->desc) { |
4cf0bf51 | 640 | ret = -ENOENT; |
d3dbe23c | 641 | goto register_error; |
abc0446a | 642 | } |
3c997079 MD |
643 | /* Populate lttng_event structure before event registration. */ |
644 | smp_wmb(); | |
baf20995 | 645 | break; |
ab2277d6 | 646 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
647 | /* |
648 | * Needs to be explicitly enabled after creation, since | |
649 | * we may want to apply filters. | |
650 | */ | |
651 | event->enabled = 0; | |
3c997079 MD |
652 | event->registered = 1; |
653 | /* | |
654 | * Populate lttng_event structure before event | |
655 | * registration. | |
656 | */ | |
657 | smp_wmb(); | |
658 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
659 | event_param->u.kprobe.symbol_name, |
660 | event_param->u.kprobe.offset, | |
661 | event_param->u.kprobe.addr, | |
662 | event); | |
abc0446a | 663 | if (ret) { |
4cf0bf51 | 664 | ret = -EINVAL; |
d6d808f3 | 665 | goto register_error; |
abc0446a | 666 | } |
edeb3137 MD |
667 | ret = try_module_get(event->desc->owner); |
668 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 669 | break; |
7371f44c MD |
670 | case LTTNG_KERNEL_KRETPROBE: |
671 | { | |
a90917c3 | 672 | struct lttng_event *event_return; |
7371f44c MD |
673 | |
674 | /* kretprobe defines 2 events */ | |
a0493bef MD |
675 | /* |
676 | * Needs to be explicitly enabled after creation, since | |
677 | * we may want to apply filters. | |
678 | */ | |
679 | event->enabled = 0; | |
3c997079 | 680 | event->registered = 1; |
7371f44c MD |
681 | event_return = |
682 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 683 | if (!event_return) { |
4cf0bf51 | 684 | ret = -ENOMEM; |
7371f44c | 685 | goto register_error; |
abc0446a | 686 | } |
7371f44c MD |
687 | event_return->chan = chan; |
688 | event_return->filter = filter; | |
689 | event_return->id = chan->free_event_id++; | |
a0493bef | 690 | event_return->enabled = 0; |
3c997079 MD |
691 | event_return->registered = 1; |
692 | event_return->instrumentation = itype; | |
62c465b6 FD |
693 | INIT_LIST_HEAD(&event_return->bytecode_runtime_head); |
694 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
7371f44c | 695 | /* |
a90917c3 | 696 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
697 | */ |
698 | smp_wmb(); | |
3c997079 | 699 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
700 | event_param->u.kretprobe.symbol_name, |
701 | event_param->u.kretprobe.offset, | |
702 | event_param->u.kretprobe.addr, | |
703 | event, event_return); | |
704 | if (ret) { | |
705 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 706 | ret = -EINVAL; |
7371f44c MD |
707 | goto register_error; |
708 | } | |
709 | /* Take 2 refs on the module: one per event. */ | |
710 | ret = try_module_get(event->desc->owner); | |
711 | WARN_ON_ONCE(!ret); | |
712 | ret = try_module_get(event->desc->owner); | |
713 | WARN_ON_ONCE(!ret); | |
a90917c3 | 714 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 715 | event_return); |
abc0446a | 716 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
717 | if (ret) { |
718 | kmem_cache_free(event_cache, event_return); | |
719 | module_put(event->desc->owner); | |
720 | module_put(event->desc->owner); | |
721 | goto statedump_error; | |
722 | } | |
723 | list_add(&event_return->list, &chan->session->events); | |
724 | break; | |
725 | } | |
1ec65de1 | 726 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 727 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
728 | /* |
729 | * Needs to be explicitly enabled after creation, since | |
730 | * we may want to apply filters. | |
731 | */ | |
732 | event->enabled = 0; | |
3c997079 MD |
733 | event->registered = 0; |
734 | event->desc = event_desc; | |
e298d6af MD |
735 | switch (event_param->u.syscall.entryexit) { |
736 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
737 | ret = -EINVAL; | |
738 | goto register_error; | |
739 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
740 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
741 | break; | |
742 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
743 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
744 | break; | |
745 | } | |
746 | switch (event_param->u.syscall.abi) { | |
747 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
748 | ret = -EINVAL; | |
749 | goto register_error; | |
750 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
751 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
752 | break; | |
753 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
754 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
755 | break; | |
756 | } | |
abc0446a | 757 | if (!event->desc) { |
4cf0bf51 | 758 | ret = -EINVAL; |
259b6cb3 | 759 | goto register_error; |
abc0446a | 760 | } |
1ec65de1 | 761 | break; |
149b9a9d | 762 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
763 | /* |
764 | * Needs to be explicitly enabled after creation, since | |
765 | * we may want to apply filters. | |
766 | */ | |
767 | event->enabled = 0; | |
768 | event->registered = 1; | |
3aed4dca | 769 | |
a344f64b FD |
770 | /* |
771 | * Populate lttng_event structure before event | |
772 | * registration. | |
773 | */ | |
774 | smp_wmb(); | |
149b9a9d YB |
775 | |
776 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 777 | event_param->u.uprobe.fd, |
149b9a9d YB |
778 | event); |
779 | if (ret) | |
780 | goto register_error; | |
781 | ret = try_module_get(event->desc->owner); | |
782 | WARN_ON_ONCE(!ret); | |
783 | break; | |
853aee81 | 784 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
785 | default: |
786 | WARN_ON_ONCE(1); | |
4cf0bf51 | 787 | ret = -EINVAL; |
df07930b | 788 | goto register_error; |
baf20995 | 789 | } |
a90917c3 | 790 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
791 | WARN_ON_ONCE(ret > 0); |
792 | if (ret) { | |
c099397a | 793 | goto statedump_error; |
abc0446a | 794 | } |
3c997079 | 795 | hlist_add_head(&event->hlist, head); |
dda6a249 | 796 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
797 | return event; |
798 | ||
c099397a | 799 | statedump_error: |
259b6cb3 | 800 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 801 | register_error: |
11b5a3c2 | 802 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
803 | cache_error: |
804 | exist: | |
3c997079 | 805 | type_error: |
e5382b6d | 806 | full: |
4cf0bf51 | 807 | return ERR_PTR(ret); |
4e3c1b9b MD |
808 | } |
809 | ||
3c997079 MD |
810 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
811 | struct lttng_kernel_event *event_param, | |
812 | void *filter, | |
813 | const struct lttng_event_desc *event_desc, | |
814 | enum lttng_kernel_instrumentation itype) | |
815 | { | |
816 | struct lttng_event *event; | |
817 | ||
818 | mutex_lock(&sessions_mutex); | |
819 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
820 | itype); | |
821 | mutex_unlock(&sessions_mutex); | |
822 | return event; | |
823 | } | |
824 | ||
825 | /* Only used for tracepoints for now. */ | |
826 | static | |
827 | void register_event(struct lttng_event *event) | |
828 | { | |
829 | const struct lttng_event_desc *desc; | |
f127e61e | 830 | int ret = -EINVAL; |
3c997079 | 831 | |
3c997079 MD |
832 | if (event->registered) |
833 | return; | |
4ecb5ad5 | 834 | |
3c997079 | 835 | desc = event->desc; |
4ecb5ad5 MD |
836 | switch (event->instrumentation) { |
837 | case LTTNG_KERNEL_TRACEPOINT: | |
838 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
839 | desc->probe_callback, | |
840 | event); | |
841 | break; | |
842 | case LTTNG_KERNEL_SYSCALL: | |
e298d6af | 843 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
844 | break; |
845 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 846 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 847 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
848 | case LTTNG_KERNEL_NOOP: |
849 | ret = 0; | |
850 | break; | |
853aee81 | 851 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
852 | default: |
853 | WARN_ON_ONCE(1); | |
854 | } | |
3c997079 MD |
855 | if (!ret) |
856 | event->registered = 1; | |
857 | } | |
858 | ||
4e3c1b9b MD |
859 | /* |
860 | * Only used internally at session destruction. | |
861 | */ | |
a90917c3 | 862 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 863 | { |
4ecb5ad5 | 864 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
865 | int ret = -EINVAL; |
866 | ||
3c997079 MD |
867 | if (!event->registered) |
868 | return 0; | |
869 | ||
4ecb5ad5 | 870 | desc = event->desc; |
38d024ae | 871 | switch (event->instrumentation) { |
ab2277d6 | 872 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 873 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 874 | event->desc->probe_callback, |
11b5a3c2 | 875 | event); |
baf20995 | 876 | break; |
ab2277d6 | 877 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 878 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
879 | ret = 0; |
880 | break; | |
7371f44c MD |
881 | case LTTNG_KERNEL_KRETPROBE: |
882 | lttng_kretprobes_unregister(event); | |
883 | ret = 0; | |
884 | break; | |
33a39a3c | 885 | case LTTNG_KERNEL_SYSCALL: |
e298d6af | 886 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
887 | break; |
888 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
889 | ret = 0; |
890 | break; | |
149b9a9d YB |
891 | case LTTNG_KERNEL_UPROBE: |
892 | lttng_uprobes_unregister(event); | |
893 | ret = 0; | |
894 | break; | |
853aee81 | 895 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
896 | default: |
897 | WARN_ON_ONCE(1); | |
898 | } | |
3c997079 MD |
899 | if (!ret) |
900 | event->registered = 0; | |
dda6a249 MD |
901 | return ret; |
902 | } | |
903 | ||
904 | /* | |
905 | * Only used internally at session destruction. | |
906 | */ | |
be066e6c | 907 | static |
a90917c3 | 908 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 909 | { |
509680fb MD |
910 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
911 | ||
edeb3137 MD |
912 | switch (event->instrumentation) { |
913 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 914 | lttng_event_put(event->desc); |
edeb3137 MD |
915 | break; |
916 | case LTTNG_KERNEL_KPROBE: | |
917 | module_put(event->desc->owner); | |
918 | lttng_kprobes_destroy_private(event); | |
919 | break; | |
7371f44c MD |
920 | case LTTNG_KERNEL_KRETPROBE: |
921 | module_put(event->desc->owner); | |
922 | lttng_kretprobes_destroy_private(event); | |
923 | break; | |
259b6cb3 | 924 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 925 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 926 | break; |
149b9a9d YB |
927 | case LTTNG_KERNEL_UPROBE: |
928 | module_put(event->desc->owner); | |
929 | lttng_uprobes_destroy_private(event); | |
930 | break; | |
853aee81 | 931 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
932 | default: |
933 | WARN_ON_ONCE(1); | |
934 | } | |
dda6a249 | 935 | list_del(&event->list); |
8070f5c0 | 936 | lttng_destroy_context(event->ctx); |
509680fb MD |
937 | lttng_free_event_filter_runtime(event); |
938 | /* Free event enabler refs */ | |
939 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
940 | &event->enablers_ref_head, node) | |
941 | kfree(enabler_ref); | |
11b5a3c2 | 942 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
943 | } |
944 | ||
e0130fab MD |
945 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
946 | { | |
947 | int ret; | |
948 | ||
949 | if (pid < -1) | |
950 | return -EINVAL; | |
951 | mutex_lock(&sessions_mutex); | |
952 | if (pid == -1) { | |
953 | /* track all pids: destroy tracker. */ | |
954 | if (session->pid_tracker) { | |
955 | struct lttng_pid_tracker *lpf; | |
956 | ||
957 | lpf = session->pid_tracker; | |
958 | rcu_assign_pointer(session->pid_tracker, NULL); | |
959 | synchronize_trace(); | |
960 | lttng_pid_tracker_destroy(lpf); | |
961 | } | |
962 | ret = 0; | |
963 | } else { | |
964 | if (!session->pid_tracker) { | |
965 | struct lttng_pid_tracker *lpf; | |
966 | ||
967 | lpf = lttng_pid_tracker_create(); | |
968 | if (!lpf) { | |
969 | ret = -ENOMEM; | |
970 | goto unlock; | |
971 | } | |
972 | ret = lttng_pid_tracker_add(lpf, pid); | |
973 | rcu_assign_pointer(session->pid_tracker, lpf); | |
974 | } else { | |
975 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
976 | } | |
977 | } | |
978 | unlock: | |
979 | mutex_unlock(&sessions_mutex); | |
980 | return ret; | |
981 | } | |
982 | ||
983 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
984 | { | |
985 | int ret; | |
986 | ||
987 | if (pid < -1) | |
988 | return -EINVAL; | |
989 | mutex_lock(&sessions_mutex); | |
990 | if (pid == -1) { | |
991 | /* untrack all pids: replace by empty tracker. */ | |
992 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
993 | struct lttng_pid_tracker *lpf; | |
994 | ||
995 | lpf = lttng_pid_tracker_create(); | |
996 | if (!lpf) { | |
997 | ret = -ENOMEM; | |
998 | goto unlock; | |
999 | } | |
1000 | rcu_assign_pointer(session->pid_tracker, lpf); | |
1001 | synchronize_trace(); | |
1002 | if (old_lpf) | |
1003 | lttng_pid_tracker_destroy(old_lpf); | |
1004 | ret = 0; | |
1005 | } else { | |
1006 | if (!session->pid_tracker) { | |
1007 | ret = -ENOENT; | |
1008 | goto unlock; | |
1009 | } | |
1010 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
1011 | } | |
1012 | unlock: | |
1013 | mutex_unlock(&sessions_mutex); | |
1014 | return ret; | |
1015 | } | |
1016 | ||
7e6f9ef6 MD |
1017 | static |
1018 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
1019 | { | |
1020 | struct lttng_session *session = m->private; | |
1021 | struct lttng_pid_tracker *lpf; | |
1022 | struct lttng_pid_hash_node *e; | |
1023 | int iter = 0, i; | |
1024 | ||
1025 | mutex_lock(&sessions_mutex); | |
1026 | lpf = session->pid_tracker; | |
1027 | if (lpf) { | |
1028 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1029 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1030 | ||
f934e302 | 1031 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1032 | if (iter++ >= *pos) |
1033 | return e; | |
1034 | } | |
1035 | } | |
1036 | } else { | |
1037 | /* PID tracker disabled. */ | |
1038 | if (iter >= *pos && iter == 0) { | |
1039 | return session; /* empty tracker */ | |
1040 | } | |
1041 | iter++; | |
1042 | } | |
1043 | /* End of list */ | |
1044 | return NULL; | |
1045 | } | |
1046 | ||
1047 | /* Called with sessions_mutex held. */ | |
1048 | static | |
1049 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1050 | { | |
1051 | struct lttng_session *session = m->private; | |
1052 | struct lttng_pid_tracker *lpf; | |
1053 | struct lttng_pid_hash_node *e; | |
1054 | int iter = 0, i; | |
1055 | ||
1056 | (*ppos)++; | |
1057 | lpf = session->pid_tracker; | |
1058 | if (lpf) { | |
1059 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1060 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1061 | ||
f934e302 | 1062 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1063 | if (iter++ >= *ppos) |
1064 | return e; | |
1065 | } | |
1066 | } | |
1067 | } else { | |
1068 | /* PID tracker disabled. */ | |
1069 | if (iter >= *ppos && iter == 0) | |
1070 | return session; /* empty tracker */ | |
1071 | iter++; | |
1072 | } | |
1073 | ||
1074 | /* End of list */ | |
1075 | return NULL; | |
1076 | } | |
1077 | ||
1078 | static | |
1079 | void pid_list_stop(struct seq_file *m, void *p) | |
1080 | { | |
1081 | mutex_unlock(&sessions_mutex); | |
1082 | } | |
1083 | ||
1084 | static | |
1085 | int pid_list_show(struct seq_file *m, void *p) | |
1086 | { | |
1087 | int pid; | |
1088 | ||
1089 | if (p == m->private) { | |
1090 | /* Tracker disabled. */ | |
1091 | pid = -1; | |
1092 | } else { | |
1093 | const struct lttng_pid_hash_node *e = p; | |
1094 | ||
1095 | pid = lttng_pid_tracker_get_node_pid(e); | |
1096 | } | |
1097 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static | |
1102 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1103 | .start = pid_list_start, | |
1104 | .next = pid_list_next, | |
1105 | .stop = pid_list_stop, | |
1106 | .show = pid_list_show, | |
1107 | }; | |
1108 | ||
1109 | static | |
1110 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1111 | { | |
1112 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1113 | } | |
1114 | ||
1115 | static | |
1116 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1117 | { | |
1118 | struct seq_file *m = file->private_data; | |
1119 | struct lttng_session *session = m->private; | |
1120 | int ret; | |
1121 | ||
1122 | WARN_ON_ONCE(!session); | |
1123 | ret = seq_release(inode, file); | |
1124 | if (!ret && session) | |
1125 | fput(session->file); | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1130 | .owner = THIS_MODULE, | |
1131 | .open = lttng_tracker_pids_list_open, | |
1132 | .read = seq_read, | |
1133 | .llseek = seq_lseek, | |
1134 | .release = lttng_tracker_pids_list_release, | |
1135 | }; | |
1136 | ||
1137 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1138 | { | |
1139 | struct file *tracker_pids_list_file; | |
1140 | struct seq_file *m; | |
1141 | int file_fd, ret; | |
1142 | ||
1143 | file_fd = lttng_get_unused_fd(); | |
1144 | if (file_fd < 0) { | |
1145 | ret = file_fd; | |
1146 | goto fd_error; | |
1147 | } | |
1148 | ||
1149 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1150 | <tng_tracker_pids_list_fops, | |
1151 | NULL, O_RDWR); | |
1152 | if (IS_ERR(tracker_pids_list_file)) { | |
1153 | ret = PTR_ERR(tracker_pids_list_file); | |
1154 | goto file_error; | |
1155 | } | |
5ad19305 MJ |
1156 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1157 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1158 | goto refcount_error; |
1159 | } | |
7e6f9ef6 MD |
1160 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1161 | if (ret < 0) | |
1162 | goto open_error; | |
1163 | m = tracker_pids_list_file->private_data; | |
1164 | m->private = session; | |
1165 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1166 | |
1167 | return file_fd; | |
1168 | ||
1169 | open_error: | |
9c1f4643 MD |
1170 | atomic_long_dec(&session->file->f_count); |
1171 | refcount_error: | |
7e6f9ef6 MD |
1172 | fput(tracker_pids_list_file); |
1173 | file_error: | |
1174 | put_unused_fd(file_fd); | |
1175 | fd_error: | |
1176 | return ret; | |
1177 | } | |
1178 | ||
3c997079 MD |
1179 | /* |
1180 | * Enabler management. | |
1181 | */ | |
1182 | static | |
4993071a PP |
1183 | int lttng_match_enabler_star_glob(const char *desc_name, |
1184 | const char *pattern) | |
3c997079 | 1185 | { |
cbc19040 MD |
1186 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1187 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1188 | return 0; |
1189 | return 1; | |
1190 | } | |
1191 | ||
1192 | static | |
4ecb5ad5 MD |
1193 | int lttng_match_enabler_name(const char *desc_name, |
1194 | const char *name) | |
3c997079 | 1195 | { |
4ecb5ad5 | 1196 | if (strcmp(desc_name, name)) |
3c997079 MD |
1197 | return 0; |
1198 | return 1; | |
1199 | } | |
1200 | ||
1201 | static | |
1202 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1203 | struct lttng_enabler *enabler) | |
1204 | { | |
4ecb5ad5 | 1205 | const char *desc_name, *enabler_name; |
e298d6af | 1206 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1207 | |
1208 | enabler_name = enabler->event_param.name; | |
1209 | switch (enabler->event_param.instrumentation) { | |
1210 | case LTTNG_KERNEL_TRACEPOINT: | |
1211 | desc_name = desc->name; | |
e298d6af MD |
1212 | switch (enabler->type) { |
1213 | case LTTNG_ENABLER_STAR_GLOB: | |
1214 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1215 | case LTTNG_ENABLER_NAME: | |
1216 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1217 | default: | |
1218 | return -EINVAL; | |
1219 | } | |
4ecb5ad5 MD |
1220 | break; |
1221 | case LTTNG_KERNEL_SYSCALL: | |
1222 | desc_name = desc->name; | |
e298d6af | 1223 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1224 | desc_name += strlen("compat_"); |
e298d6af MD |
1225 | compat = true; |
1226 | } | |
4ecb5ad5 MD |
1227 | if (!strncmp(desc_name, "syscall_exit_", |
1228 | strlen("syscall_exit_"))) { | |
1229 | desc_name += strlen("syscall_exit_"); | |
1230 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1231 | strlen("syscall_entry_"))) { | |
1232 | desc_name += strlen("syscall_entry_"); | |
e298d6af | 1233 | entry = true; |
4ecb5ad5 MD |
1234 | } else { |
1235 | WARN_ON_ONCE(1); | |
1236 | return -EINVAL; | |
1237 | } | |
e298d6af MD |
1238 | switch (enabler->event_param.u.syscall.entryexit) { |
1239 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1240 | break; | |
1241 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1242 | if (!entry) | |
1243 | return 0; | |
1244 | break; | |
1245 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1246 | if (entry) | |
1247 | return 0; | |
1248 | break; | |
1249 | default: | |
1250 | return -EINVAL; | |
1251 | } | |
1252 | switch (enabler->event_param.u.syscall.abi) { | |
1253 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1254 | break; | |
1255 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1256 | if (compat) | |
1257 | return 0; | |
1258 | break; | |
1259 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1260 | if (!compat) | |
1261 | return 0; | |
1262 | break; | |
1263 | default: | |
1264 | return -EINVAL; | |
1265 | } | |
1266 | switch (enabler->event_param.u.syscall.match) { | |
1267 | case LTTNG_SYSCALL_MATCH_NAME: | |
1268 | switch (enabler->type) { | |
1269 | case LTTNG_ENABLER_STAR_GLOB: | |
1270 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1271 | case LTTNG_ENABLER_NAME: | |
1272 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1273 | default: | |
1274 | return -EINVAL; | |
1275 | } | |
1276 | break; | |
1277 | case LTTNG_SYSCALL_MATCH_NR: | |
1278 | return -EINVAL; /* Not implemented. */ | |
1279 | default: | |
1280 | return -EINVAL; | |
1281 | } | |
4ecb5ad5 MD |
1282 | break; |
1283 | default: | |
1284 | WARN_ON_ONCE(1); | |
1285 | return -EINVAL; | |
1286 | } | |
3c997079 MD |
1287 | } |
1288 | ||
1289 | static | |
1290 | int lttng_event_match_enabler(struct lttng_event *event, | |
1291 | struct lttng_enabler *enabler) | |
1292 | { | |
33a39a3c MD |
1293 | if (enabler->event_param.instrumentation != event->instrumentation) |
1294 | return 0; | |
3c997079 MD |
1295 | if (lttng_desc_match_enabler(event->desc, enabler) |
1296 | && event->chan == enabler->chan) | |
1297 | return 1; | |
1298 | else | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static | |
1303 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1304 | struct lttng_enabler *enabler) | |
1305 | { | |
1306 | struct lttng_enabler_ref *enabler_ref; | |
1307 | ||
1308 | list_for_each_entry(enabler_ref, | |
1309 | &event->enablers_ref_head, node) { | |
1310 | if (enabler_ref->ref == enabler) | |
1311 | return enabler_ref; | |
1312 | } | |
1313 | return NULL; | |
1314 | } | |
1315 | ||
3c997079 | 1316 | static |
33a39a3c | 1317 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1318 | { |
1319 | struct lttng_session *session = enabler->chan->session; | |
1320 | struct lttng_probe_desc *probe_desc; | |
1321 | const struct lttng_event_desc *desc; | |
1322 | int i; | |
1323 | struct list_head *probe_list; | |
1324 | ||
1325 | probe_list = lttng_get_probe_list_head(); | |
1326 | /* | |
1327 | * For each probe event, if we find that a probe event matches | |
1328 | * our enabler, create an associated lttng_event if not | |
1329 | * already present. | |
1330 | */ | |
1331 | list_for_each_entry(probe_desc, probe_list, head) { | |
1332 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1333 | int found = 0; | |
1334 | struct hlist_head *head; | |
1335 | const char *event_name; | |
1336 | size_t name_len; | |
1337 | uint32_t hash; | |
1338 | struct lttng_event *event; | |
1339 | ||
1340 | desc = probe_desc->event_desc[i]; | |
1341 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1342 | continue; | |
1343 | event_name = desc->name; | |
1344 | name_len = strlen(event_name); | |
1345 | ||
1346 | /* | |
1347 | * Check if already created. | |
1348 | */ | |
1349 | hash = jhash(event_name, name_len, 0); | |
1350 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1351 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1352 | if (event->desc == desc |
1353 | && event->chan == enabler->chan) | |
1354 | found = 1; | |
1355 | } | |
1356 | if (found) | |
1357 | continue; | |
1358 | ||
1359 | /* | |
1360 | * We need to create an event for this | |
1361 | * event probe. | |
1362 | */ | |
1363 | event = _lttng_event_create(enabler->chan, | |
1364 | NULL, NULL, desc, | |
1365 | LTTNG_KERNEL_TRACEPOINT); | |
1366 | if (!event) { | |
1367 | printk(KERN_INFO "Unable to create event %s\n", | |
1368 | probe_desc->event_desc[i]->name); | |
1369 | } | |
1370 | } | |
1371 | } | |
1372 | } | |
1373 | ||
33a39a3c MD |
1374 | static |
1375 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1376 | { | |
1377 | int ret; | |
1378 | ||
1379 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1380 | WARN_ON_ONCE(ret); | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * Create struct lttng_event if it is missing and present in the list of | |
1385 | * tracepoint probes. | |
1386 | * Should be called with sessions mutex held. | |
1387 | */ | |
1388 | static | |
1389 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1390 | { | |
1391 | switch (enabler->event_param.instrumentation) { | |
1392 | case LTTNG_KERNEL_TRACEPOINT: | |
1393 | lttng_create_tracepoint_if_missing(enabler); | |
1394 | break; | |
1395 | case LTTNG_KERNEL_SYSCALL: | |
1396 | lttng_create_syscall_if_missing(enabler); | |
1397 | break; | |
1398 | default: | |
1399 | WARN_ON_ONCE(1); | |
1400 | break; | |
1401 | } | |
1402 | } | |
1403 | ||
3c997079 MD |
1404 | /* |
1405 | * Create events associated with an enabler (if not already present), | |
1406 | * and add backward reference from the event to the enabler. | |
1407 | * Should be called with sessions mutex held. | |
1408 | */ | |
1409 | static | |
1410 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1411 | { | |
e298d6af MD |
1412 | struct lttng_channel *chan = enabler->chan; |
1413 | struct lttng_session *session = chan->session; | |
3c997079 MD |
1414 | struct lttng_event *event; |
1415 | ||
e298d6af MD |
1416 | if (enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1417 | enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1418 | enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1419 | enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1420 | !strcmp(enabler->event_param.name, "*")) { | |
1421 | if (enabler->enabled) | |
1422 | WRITE_ONCE(chan->syscall_all, 1); | |
1423 | else | |
1424 | WRITE_ONCE(chan->syscall_all, 0); | |
1425 | } | |
1426 | ||
3c997079 MD |
1427 | /* First ensure that probe events are created for this enabler. */ |
1428 | lttng_create_event_if_missing(enabler); | |
1429 | ||
1430 | /* For each event matching enabler in session event list. */ | |
1431 | list_for_each_entry(event, &session->events, list) { | |
1432 | struct lttng_enabler_ref *enabler_ref; | |
1433 | ||
1434 | if (!lttng_event_match_enabler(event, enabler)) | |
1435 | continue; | |
1436 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1437 | if (!enabler_ref) { | |
1438 | /* | |
1439 | * If no backward ref, create it. | |
1440 | * Add backward ref from event to enabler. | |
1441 | */ | |
1442 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1443 | if (!enabler_ref) | |
1444 | return -ENOMEM; | |
1445 | enabler_ref->ref = enabler; | |
1446 | list_add(&enabler_ref->node, | |
1447 | &event->enablers_ref_head); | |
1448 | } | |
1449 | ||
f127e61e MD |
1450 | /* |
1451 | * Link filter bytecodes if not linked yet. | |
1452 | */ | |
1453 | lttng_enabler_event_link_bytecode(event, enabler); | |
1454 | ||
3c997079 MD |
1455 | /* TODO: merge event context. */ |
1456 | } | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | /* | |
1461 | * Called at module load: connect the probe on all enablers matching | |
1462 | * this event. | |
1463 | * Called with sessions lock held. | |
1464 | */ | |
1465 | int lttng_fix_pending_events(void) | |
1466 | { | |
1467 | struct lttng_session *session; | |
1468 | ||
1469 | list_for_each_entry(session, &sessions, list) | |
1470 | lttng_session_lazy_sync_enablers(session); | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1475 | struct lttng_kernel_event *event_param, | |
1476 | struct lttng_channel *chan) | |
1477 | { | |
1478 | struct lttng_enabler *enabler; | |
1479 | ||
1480 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1481 | if (!enabler) | |
1482 | return NULL; | |
1483 | enabler->type = type; | |
07dfc1d0 | 1484 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1485 | memcpy(&enabler->event_param, event_param, |
1486 | sizeof(enabler->event_param)); | |
1487 | enabler->chan = chan; | |
1488 | /* ctx left NULL */ | |
4fd19d8a | 1489 | enabler->enabled = 0; |
3c997079 MD |
1490 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1491 | mutex_lock(&sessions_mutex); | |
1492 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1493 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1494 | mutex_unlock(&sessions_mutex); | |
1495 | return enabler; | |
1496 | } | |
1497 | ||
1498 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1499 | { | |
1500 | mutex_lock(&sessions_mutex); | |
1501 | enabler->enabled = 1; | |
1502 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1503 | mutex_unlock(&sessions_mutex); | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1508 | { | |
1509 | mutex_lock(&sessions_mutex); | |
1510 | enabler->enabled = 0; | |
1511 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1512 | mutex_unlock(&sessions_mutex); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
07dfc1d0 MD |
1516 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1517 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1518 | { | |
1519 | struct lttng_filter_bytecode_node *bytecode_node; | |
1520 | uint32_t bytecode_len; | |
1521 | int ret; | |
1522 | ||
1523 | ret = get_user(bytecode_len, &bytecode->len); | |
1524 | if (ret) | |
1525 | return ret; | |
1526 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1527 | GFP_KERNEL); | |
1528 | if (!bytecode_node) | |
1529 | return -ENOMEM; | |
1530 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1531 | sizeof(*bytecode) + bytecode_len); | |
1532 | if (ret) | |
1533 | goto error_free; | |
1534 | bytecode_node->enabler = enabler; | |
1535 | /* Enforce length based on allocated size */ | |
1536 | bytecode_node->bc.len = bytecode_len; | |
1537 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1538 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1539 | return 0; | |
1540 | ||
1541 | error_free: | |
1542 | kfree(bytecode_node); | |
1543 | return ret; | |
1544 | } | |
1545 | ||
3aed4dca FD |
1546 | int lttng_event_add_callsite(struct lttng_event *event, |
1547 | struct lttng_kernel_event_callsite __user *callsite) | |
1548 | { | |
1549 | ||
1550 | switch (event->instrumentation) { | |
1551 | case LTTNG_KERNEL_UPROBE: | |
1552 | return lttng_uprobes_add_callsite(event, callsite); | |
1553 | default: | |
1554 | return -EINVAL; | |
1555 | } | |
1556 | } | |
1557 | ||
3c997079 MD |
1558 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1559 | struct lttng_kernel_context *context_param) | |
1560 | { | |
1561 | return -ENOSYS; | |
1562 | } | |
1563 | ||
1564 | static | |
1565 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1566 | { | |
07dfc1d0 MD |
1567 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1568 | ||
1569 | /* Destroy filter bytecode */ | |
1570 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1571 | &enabler->filter_bytecode_head, node) { | |
1572 | kfree(filter_node); | |
1573 | } | |
1574 | ||
3c997079 MD |
1575 | /* Destroy contexts */ |
1576 | lttng_destroy_context(enabler->ctx); | |
1577 | ||
1578 | list_del(&enabler->node); | |
1579 | kfree(enabler); | |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * lttng_session_sync_enablers should be called just before starting a | |
1584 | * session. | |
1585 | * Should be called with sessions mutex held. | |
1586 | */ | |
1587 | static | |
1588 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1589 | { | |
1590 | struct lttng_enabler *enabler; | |
1591 | struct lttng_event *event; | |
1592 | ||
1593 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1594 | lttng_enabler_ref_events(enabler); | |
1595 | /* | |
1596 | * For each event, if at least one of its enablers is enabled, | |
1597 | * and its channel and session transient states are enabled, we | |
1598 | * enable the event, else we disable it. | |
1599 | */ | |
1600 | list_for_each_entry(event, &session->events, list) { | |
1601 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1602 | struct lttng_bytecode_runtime *runtime; |
1603 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1604 | |
4ecb5ad5 MD |
1605 | switch (event->instrumentation) { |
1606 | case LTTNG_KERNEL_TRACEPOINT: | |
1607 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1608 | /* Enable events */ |
1609 | list_for_each_entry(enabler_ref, | |
1610 | &event->enablers_ref_head, node) { | |
1611 | if (enabler_ref->ref->enabled) { | |
1612 | enabled = 1; | |
1613 | break; | |
1614 | } | |
1615 | } | |
4ecb5ad5 MD |
1616 | break; |
1617 | default: | |
3c997079 MD |
1618 | /* Not handled with lazy sync. */ |
1619 | continue; | |
1620 | } | |
1621 | /* | |
1622 | * Enabled state is based on union of enablers, with | |
1623 | * intesection of session and channel transient enable | |
1624 | * states. | |
1625 | */ | |
1626 | enabled = enabled && session->tstate && event->chan->tstate; | |
1627 | ||
a8f2d0c7 | 1628 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1629 | /* |
1630 | * Sync tracepoint registration with event enabled | |
1631 | * state. | |
1632 | */ | |
1633 | if (enabled) { | |
1634 | register_event(event); | |
1635 | } else { | |
1636 | _lttng_event_unregister(event); | |
1637 | } | |
07dfc1d0 MD |
1638 | |
1639 | /* Check if has enablers without bytecode enabled */ | |
1640 | list_for_each_entry(enabler_ref, | |
1641 | &event->enablers_ref_head, node) { | |
1642 | if (enabler_ref->ref->enabled | |
1643 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1644 | has_enablers_without_bytecode = 1; | |
1645 | break; | |
1646 | } | |
1647 | } | |
1648 | event->has_enablers_without_bytecode = | |
1649 | has_enablers_without_bytecode; | |
1650 | ||
1651 | /* Enable filters */ | |
1652 | list_for_each_entry(runtime, | |
f127e61e | 1653 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1654 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1655 | } |
1656 | } | |
1657 | ||
1658 | /* | |
1659 | * Apply enablers to session events, adding events to session if need | |
1660 | * be. It is required after each modification applied to an active | |
1661 | * session, and right before session "start". | |
1662 | * "lazy" sync means we only sync if required. | |
1663 | * Should be called with sessions mutex held. | |
1664 | */ | |
1665 | static | |
1666 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1667 | { | |
1668 | /* We can skip if session is not active */ | |
1669 | if (!session->active) | |
1670 | return; | |
1671 | lttng_session_sync_enablers(session); | |
1672 | } | |
1673 | ||
1ec3f75a | 1674 | /* |
d83004aa JD |
1675 | * Serialize at most one packet worth of metadata into a metadata |
1676 | * channel. | |
92d9f5e6 MD |
1677 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1678 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1679 | * allows us to do racy operations such as looking for remaining space left in | |
1680 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1681 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1682 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1683 | * Returns the number of bytes written in the channel, 0 if no data |
1684 | * was written and a negative value on error. | |
1ec3f75a | 1685 | */ |
b3b8072b | 1686 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
695b3509 | 1687 | struct channel *chan, bool *coherent) |
d83004aa JD |
1688 | { |
1689 | struct lib_ring_buffer_ctx ctx; | |
1690 | int ret = 0; | |
1691 | size_t len, reserve_len; | |
1692 | ||
f613e3e6 | 1693 | /* |
92d9f5e6 MD |
1694 | * Ensure we support mutiple get_next / put sequences followed by |
1695 | * put_next. The metadata cache lock protects reading the metadata | |
1696 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1697 | * "flush" operations on the buffer invoked by different processes. | |
1698 | * Moreover, since the metadata cache memory can be reallocated, we | |
1699 | * need to have exclusive access against updates even though we only | |
1700 | * read it. | |
f613e3e6 | 1701 | */ |
92d9f5e6 | 1702 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1703 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1704 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1705 | goto end; |
f613e3e6 | 1706 | |
9616f0bf JD |
1707 | /* Metadata regenerated, change the version. */ |
1708 | if (stream->metadata_cache->version != stream->version) | |
1709 | stream->version = stream->metadata_cache->version; | |
1710 | ||
d83004aa | 1711 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1712 | stream->metadata_in; |
9de2c215 | 1713 | if (!len) |
de23d59d | 1714 | goto end; |
d83004aa | 1715 | reserve_len = min_t(size_t, |
b3b8072b | 1716 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1717 | len); |
b3b8072b | 1718 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1719 | sizeof(char), -1); |
1720 | /* | |
1721 | * If reservation failed, return an error to the caller. | |
1722 | */ | |
b3b8072b | 1723 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1724 | if (ret != 0) { |
1725 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
695b3509 | 1726 | stream->coherent = false; |
d83004aa JD |
1727 | goto end; |
1728 | } | |
b3b8072b | 1729 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1730 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1731 | reserve_len); |
b3b8072b | 1732 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1733 | stream->metadata_in += reserve_len; |
a5e2ec2d | 1734 | if (reserve_len < len) |
695b3509 MD |
1735 | stream->coherent = false; |
1736 | else | |
1737 | stream->coherent = true; | |
d83004aa JD |
1738 | ret = reserve_len; |
1739 | ||
1740 | end: | |
695b3509 MD |
1741 | if (coherent) |
1742 | *coherent = stream->coherent; | |
92d9f5e6 | 1743 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1744 | return ret; |
1745 | } | |
1746 | ||
695b3509 MD |
1747 | static |
1748 | void lttng_metadata_begin(struct lttng_session *session) | |
1749 | { | |
a5e2ec2d MD |
1750 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1751 | mutex_lock(&session->metadata_cache->lock); | |
695b3509 MD |
1752 | } |
1753 | ||
1754 | static | |
1755 | void lttng_metadata_end(struct lttng_session *session) | |
1756 | { | |
a5e2ec2d MD |
1757 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1758 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1759 | struct lttng_metadata_stream *stream; | |
1760 | ||
a5e2ec2d MD |
1761 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1762 | wake_up_interruptible(&stream->read_wait); | |
073fe00c | 1763 | mutex_unlock(&session->metadata_cache->lock); |
a5e2ec2d | 1764 | } |
695b3509 MD |
1765 | } |
1766 | ||
d83004aa JD |
1767 | /* |
1768 | * Write the metadata to the metadata cache. | |
1769 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1770 | * The metadata cache lock protects us from concurrent read access from |
1771 | * thread outputting metadata content to ring buffer. | |
695b3509 MD |
1772 | * The content of the printf is printed as a single atomic metadata |
1773 | * transaction. | |
d83004aa | 1774 | */ |
a90917c3 | 1775 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1776 | const char *fmt, ...) |
1777 | { | |
c099397a | 1778 | char *str; |
d83004aa | 1779 | size_t len; |
c099397a MD |
1780 | va_list ap; |
1781 | ||
21ed5ea7 | 1782 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
1783 | |
1784 | va_start(ap, fmt); | |
1785 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1786 | va_end(ap); | |
1787 | if (!str) | |
1788 | return -ENOMEM; | |
1789 | ||
1ec3f75a | 1790 | len = strlen(str); |
a5e2ec2d | 1791 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1792 | if (session->metadata_cache->metadata_written + len > |
1793 | session->metadata_cache->cache_alloc) { | |
1794 | char *tmp_cache_realloc; | |
1795 | unsigned int tmp_cache_alloc_size; | |
1796 | ||
1797 | tmp_cache_alloc_size = max_t(unsigned int, | |
1798 | session->metadata_cache->cache_alloc + len, | |
1799 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1800 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1801 | if (!tmp_cache_realloc) |
1802 | goto err; | |
a606b6e8 ML |
1803 | if (session->metadata_cache->data) { |
1804 | memcpy(tmp_cache_realloc, | |
1805 | session->metadata_cache->data, | |
1806 | session->metadata_cache->cache_alloc); | |
1807 | vfree(session->metadata_cache->data); | |
1808 | } | |
1809 | ||
d83004aa JD |
1810 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1811 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1812 | } |
d83004aa JD |
1813 | memcpy(session->metadata_cache->data + |
1814 | session->metadata_cache->metadata_written, | |
1815 | str, len); | |
1816 | session->metadata_cache->metadata_written += len; | |
c099397a | 1817 | kfree(str); |
d83004aa | 1818 | |
d83004aa JD |
1819 | return 0; |
1820 | ||
1821 | err: | |
1822 | kfree(str); | |
1823 | return -ENOMEM; | |
c099397a MD |
1824 | } |
1825 | ||
f513b2bf MD |
1826 | static |
1827 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1828 | { | |
1829 | size_t i; | |
1830 | ||
1831 | for (i = 0; i < nesting; i++) { | |
1832 | int ret; | |
1833 | ||
1834 | ret = lttng_metadata_printf(session, " "); | |
1835 | if (ret) { | |
1836 | return ret; | |
1837 | } | |
1838 | } | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Must be called with sessions_mutex held. | |
1844 | */ | |
1845 | static | |
1846 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1847 | const struct lttng_type *type, | |
1848 | size_t nesting) | |
1849 | { | |
1850 | int ret; | |
1851 | uint32_t i, nr_fields; | |
1852 | ||
1853 | ret = print_tabs(session, nesting); | |
1854 | if (ret) | |
1855 | return ret; | |
1856 | ret = lttng_metadata_printf(session, | |
1857 | "struct {\n"); | |
1858 | if (ret) | |
1859 | return ret; | |
1860 | nr_fields = type->u._struct.nr_fields; | |
1861 | for (i = 0; i < nr_fields; i++) { | |
1862 | const struct lttng_event_field *iter_field; | |
1863 | ||
1864 | iter_field = &type->u._struct.fields[i]; | |
1865 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1866 | if (ret) | |
1867 | return ret; | |
1868 | } | |
1869 | ret = print_tabs(session, nesting); | |
1870 | if (ret) | |
1871 | return ret; | |
1872 | ret = lttng_metadata_printf(session, | |
1873 | "}"); | |
1874 | return ret; | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * Must be called with sessions_mutex held. | |
1879 | */ | |
1880 | static | |
1881 | int _lttng_struct_statedump(struct lttng_session *session, | |
1882 | const struct lttng_event_field *field, | |
1883 | size_t nesting) | |
1884 | { | |
1885 | int ret; | |
1886 | ||
1887 | ret = _lttng_struct_type_statedump(session, | |
1888 | &field->type, nesting); | |
1889 | if (ret) | |
1890 | return ret; | |
1891 | ret = lttng_metadata_printf(session, | |
1892 | "_%s;\n", | |
1893 | field->name); | |
1894 | return ret; | |
1895 | } | |
1896 | ||
65c85aa6 MD |
1897 | /* |
1898 | * Must be called with sessions_mutex held. | |
1899 | */ | |
1900 | static | |
1901 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1902 | const struct lttng_type *type, | |
1903 | size_t nesting) | |
1904 | { | |
1905 | int ret; | |
1906 | uint32_t i, nr_choices; | |
1907 | ||
1908 | ret = print_tabs(session, nesting); | |
1909 | if (ret) | |
1910 | return ret; | |
1911 | ret = lttng_metadata_printf(session, | |
1912 | "variant <_%s> {\n", | |
1913 | type->u.variant.tag_name); | |
1914 | if (ret) | |
1915 | return ret; | |
1916 | nr_choices = type->u.variant.nr_choices; | |
1917 | for (i = 0; i < nr_choices; i++) { | |
1918 | const struct lttng_event_field *iter_field; | |
1919 | ||
1920 | iter_field = &type->u.variant.choices[i]; | |
1921 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1922 | if (ret) | |
1923 | return ret; | |
1924 | } | |
1925 | ret = print_tabs(session, nesting); | |
1926 | if (ret) | |
1927 | return ret; | |
1928 | ret = lttng_metadata_printf(session, | |
1929 | "}"); | |
1930 | return ret; | |
1931 | } | |
1932 | ||
1933 | /* | |
1934 | * Must be called with sessions_mutex held. | |
1935 | */ | |
1936 | static | |
1937 | int _lttng_variant_statedump(struct lttng_session *session, | |
1938 | const struct lttng_event_field *field, | |
1939 | size_t nesting) | |
1940 | { | |
1941 | int ret; | |
1942 | ||
1943 | ret = _lttng_variant_type_statedump(session, | |
1944 | &field->type, nesting); | |
1945 | if (ret) | |
1946 | return ret; | |
1947 | ret = lttng_metadata_printf(session, | |
1948 | "_%s;\n", | |
1949 | field->name); | |
1950 | return ret; | |
1951 | } | |
1952 | ||
f513b2bf MD |
1953 | /* |
1954 | * Must be called with sessions_mutex held. | |
1955 | */ | |
1956 | static | |
1957 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1958 | const struct lttng_event_field *field, | |
1959 | size_t nesting) | |
1960 | { | |
1961 | int ret; | |
1962 | const struct lttng_type *elem_type; | |
1963 | ||
65c85aa6 | 1964 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1965 | elem_type = field->type.u.array_compound.elem_type; |
1966 | switch (elem_type->atype) { | |
1967 | case atype_struct: | |
1968 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1969 | if (ret) | |
1970 | return ret; | |
1971 | break; | |
65c85aa6 MD |
1972 | case atype_variant: |
1973 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1974 | if (ret) | |
1975 | return ret; | |
1976 | break; | |
f513b2bf MD |
1977 | default: |
1978 | return -EINVAL; | |
1979 | } | |
1980 | ret = lttng_metadata_printf(session, | |
1981 | " _%s[%u];\n", | |
1982 | field->name, | |
1983 | field->type.u.array_compound.length); | |
1984 | return ret; | |
1985 | } | |
1986 | ||
1987 | /* | |
1988 | * Must be called with sessions_mutex held. | |
1989 | */ | |
1990 | static | |
1991 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1992 | const struct lttng_event_field *field, | |
1993 | size_t nesting) | |
1994 | { | |
1995 | int ret; | |
1996 | const char *length_name; | |
1997 | const struct lttng_type *elem_type; | |
1998 | ||
1999 | length_name = field->type.u.sequence_compound.length_name; | |
2000 | ||
65c85aa6 | 2001 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
2002 | elem_type = field->type.u.sequence_compound.elem_type; |
2003 | switch (elem_type->atype) { | |
2004 | case atype_struct: | |
2005 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
2006 | if (ret) | |
2007 | return ret; | |
2008 | break; | |
65c85aa6 MD |
2009 | case atype_variant: |
2010 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
2011 | if (ret) | |
2012 | return ret; | |
2013 | break; | |
f513b2bf MD |
2014 | default: |
2015 | return -EINVAL; | |
2016 | } | |
2017 | ret = lttng_metadata_printf(session, | |
2018 | " _%s[ _%s ];\n", | |
2019 | field->name, | |
2020 | length_name); | |
2021 | return ret; | |
2022 | } | |
2023 | ||
141ddf28 MD |
2024 | /* |
2025 | * Must be called with sessions_mutex held. | |
2026 | */ | |
2027 | static | |
2028 | int _lttng_enum_statedump(struct lttng_session *session, | |
2029 | const struct lttng_event_field *field, | |
2030 | size_t nesting) | |
2031 | { | |
2032 | const struct lttng_enum_desc *enum_desc; | |
2033 | const struct lttng_integer_type *container_type; | |
2034 | int ret; | |
2035 | unsigned int i, nr_entries; | |
2036 | ||
2037 | enum_desc = field->type.u.basic.enumeration.desc; | |
2038 | container_type = &field->type.u.basic.enumeration.container_type; | |
2039 | nr_entries = enum_desc->nr_entries; | |
2040 | ||
2041 | ret = print_tabs(session, nesting); | |
2042 | if (ret) | |
2043 | goto end; | |
2044 | ret = lttng_metadata_printf(session, | |
578e68ec | 2045 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
2046 | container_type->size, |
2047 | container_type->alignment, | |
2048 | container_type->signedness, | |
2049 | (container_type->encoding == lttng_encode_none) | |
2050 | ? "none" | |
2051 | : (container_type->encoding == lttng_encode_UTF8) | |
2052 | ? "UTF8" | |
2053 | : "ASCII", | |
578e68ec GB |
2054 | container_type->base, |
2055 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2056 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
2057 | #else | |
2058 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
2059 | #endif | |
2060 | ); | |
141ddf28 MD |
2061 | if (ret) |
2062 | goto end; | |
2063 | /* Dump all entries */ | |
2064 | for (i = 0; i < nr_entries; i++) { | |
2065 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2066 | int j, len; | |
2067 | ||
2068 | ret = print_tabs(session, nesting + 1); | |
2069 | if (ret) | |
2070 | goto end; | |
2071 | ret = lttng_metadata_printf(session, | |
2072 | "\""); | |
2073 | if (ret) | |
2074 | goto end; | |
2075 | len = strlen(entry->string); | |
2076 | /* Escape the character '"' */ | |
2077 | for (j = 0; j < len; j++) { | |
2078 | char c = entry->string[j]; | |
2079 | ||
2080 | switch (c) { | |
2081 | case '"': | |
2082 | ret = lttng_metadata_printf(session, | |
2083 | "\\\""); | |
2084 | break; | |
2085 | case '\\': | |
2086 | ret = lttng_metadata_printf(session, | |
2087 | "\\\\"); | |
2088 | break; | |
2089 | default: | |
2090 | ret = lttng_metadata_printf(session, | |
2091 | "%c", c); | |
2092 | break; | |
2093 | } | |
2094 | if (ret) | |
2095 | goto end; | |
2096 | } | |
08ad1061 PP |
2097 | ret = lttng_metadata_printf(session, "\""); |
2098 | if (ret) | |
2099 | goto end; | |
2100 | ||
2101 | if (entry->options.is_auto) { | |
2102 | ret = lttng_metadata_printf(session, ",\n"); | |
2103 | if (ret) | |
2104 | goto end; | |
141ddf28 | 2105 | } else { |
7c559490 MD |
2106 | ret = lttng_metadata_printf(session, |
2107 | " = "); | |
2108 | if (ret) | |
2109 | goto end; | |
2110 | if (entry->start.signedness) | |
141ddf28 | 2111 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2112 | "%lld", (long long) entry->start.value); |
2113 | else | |
2114 | ret = lttng_metadata_printf(session, | |
2115 | "%llu", entry->start.value); | |
2116 | if (ret) | |
2117 | goto end; | |
2118 | if (entry->start.signedness == entry->end.signedness && | |
2119 | entry->start.value | |
2120 | == entry->end.value) { | |
141ddf28 | 2121 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2122 | ",\n"); |
2123 | } else { | |
2124 | if (entry->end.signedness) { | |
2125 | ret = lttng_metadata_printf(session, | |
2126 | " ... %lld,\n", | |
2127 | (long long) entry->end.value); | |
2128 | } else { | |
2129 | ret = lttng_metadata_printf(session, | |
2130 | " ... %llu,\n", | |
2131 | entry->end.value); | |
2132 | } | |
141ddf28 | 2133 | } |
7c559490 MD |
2134 | if (ret) |
2135 | goto end; | |
141ddf28 | 2136 | } |
141ddf28 MD |
2137 | } |
2138 | ret = print_tabs(session, nesting); | |
2139 | if (ret) | |
2140 | goto end; | |
2141 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2142 | field->name); | |
2143 | end: | |
2144 | return ret; | |
2145 | } | |
2146 | ||
d83004aa JD |
2147 | /* |
2148 | * Must be called with sessions_mutex held. | |
2149 | */ | |
c099397a | 2150 | static |
a90917c3 | 2151 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2152 | const struct lttng_event_field *field, |
2153 | size_t nesting) | |
c099397a | 2154 | { |
c099397a | 2155 | int ret = 0; |
c099397a | 2156 | |
8070f5c0 MD |
2157 | switch (field->type.atype) { |
2158 | case atype_integer: | |
f513b2bf MD |
2159 | ret = print_tabs(session, nesting); |
2160 | if (ret) | |
2161 | return ret; | |
8070f5c0 | 2162 | ret = lttng_metadata_printf(session, |
f513b2bf | 2163 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2164 | field->type.u.basic.integer.size, |
2165 | field->type.u.basic.integer.alignment, | |
2166 | field->type.u.basic.integer.signedness, | |
2167 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2168 | ? "none" | |
2169 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2170 | ? "UTF8" | |
2171 | : "ASCII", | |
2172 | field->type.u.basic.integer.base, | |
5214fa50 | 2173 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2174 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2175 | #else |
8070f5c0 | 2176 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2177 | #endif |
8070f5c0 MD |
2178 | field->name); |
2179 | break; | |
2180 | case atype_enum: | |
141ddf28 | 2181 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2182 | break; |
2183 | case atype_array: | |
3834b99f | 2184 | case atype_array_bitfield: |
8070f5c0 MD |
2185 | { |
2186 | const struct lttng_basic_type *elem_type; | |
2187 | ||
2188 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2189 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2190 | ret = print_tabs(session, nesting); |
2191 | if (ret) | |
2192 | return ret; | |
43803cf2 | 2193 | ret = lttng_metadata_printf(session, |
f513b2bf | 2194 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2195 | field->type.u.array.elem_alignment * CHAR_BIT, |
2196 | field->name); | |
2197 | if (ret) | |
2198 | return ret; | |
2199 | } | |
f513b2bf MD |
2200 | ret = print_tabs(session, nesting); |
2201 | if (ret) | |
2202 | return ret; | |
8070f5c0 | 2203 | ret = lttng_metadata_printf(session, |
f513b2bf | 2204 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2205 | elem_type->u.basic.integer.size, |
2206 | elem_type->u.basic.integer.alignment, | |
2207 | elem_type->u.basic.integer.signedness, | |
2208 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2209 | ? "none" | |
2210 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2211 | ? "UTF8" | |
2212 | : "ASCII", | |
2213 | elem_type->u.basic.integer.base, | |
5214fa50 | 2214 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2215 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2216 | #else |
8070f5c0 | 2217 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2218 | #endif |
8070f5c0 MD |
2219 | field->name, field->type.u.array.length); |
2220 | break; | |
2221 | } | |
2222 | case atype_sequence: | |
3834b99f | 2223 | case atype_sequence_bitfield: |
8070f5c0 MD |
2224 | { |
2225 | const struct lttng_basic_type *elem_type; | |
2226 | const struct lttng_basic_type *length_type; | |
2227 | ||
2228 | elem_type = &field->type.u.sequence.elem_type; | |
2229 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2230 | ret = print_tabs(session, nesting); |
2231 | if (ret) | |
2232 | return ret; | |
8070f5c0 | 2233 | ret = lttng_metadata_printf(session, |
f513b2bf | 2234 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2235 | length_type->u.basic.integer.size, |
32257272 | 2236 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2237 | length_type->u.basic.integer.signedness, |
2238 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2239 | ? "none" | |
0635cdd4 | 2240 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2241 | ? "UTF8" |
0635cdd4 | 2242 | : "ASCII"), |
8070f5c0 | 2243 | length_type->u.basic.integer.base, |
5214fa50 | 2244 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2245 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2246 | #else |
0635cdd4 | 2247 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2248 | #endif |
27d2368e MD |
2249 | field->name); |
2250 | if (ret) | |
2251 | return ret; | |
2252 | ||
43803cf2 | 2253 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2254 | ret = print_tabs(session, nesting); |
2255 | if (ret) | |
2256 | return ret; | |
43803cf2 | 2257 | ret = lttng_metadata_printf(session, |
f513b2bf | 2258 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2259 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2260 | field->name); | |
2261 | if (ret) | |
2262 | return ret; | |
2263 | } | |
f513b2bf MD |
2264 | ret = print_tabs(session, nesting); |
2265 | if (ret) | |
2266 | return ret; | |
27d2368e | 2267 | ret = lttng_metadata_printf(session, |
f513b2bf | 2268 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2269 | elem_type->u.basic.integer.size, |
32257272 | 2270 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2271 | elem_type->u.basic.integer.signedness, |
2272 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2273 | ? "none" | |
0635cdd4 | 2274 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2275 | ? "UTF8" |
0635cdd4 | 2276 | : "ASCII"), |
8070f5c0 | 2277 | elem_type->u.basic.integer.base, |
5214fa50 | 2278 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2279 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2280 | #else |
8070f5c0 | 2281 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2282 | #endif |
8070f5c0 | 2283 | field->name, |
27d2368e | 2284 | field->name); |
8070f5c0 MD |
2285 | break; |
2286 | } | |
c099397a | 2287 | |
8070f5c0 MD |
2288 | case atype_string: |
2289 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2290 | ret = print_tabs(session, nesting); |
2291 | if (ret) | |
2292 | return ret; | |
8070f5c0 | 2293 | ret = lttng_metadata_printf(session, |
f513b2bf | 2294 | "string%s _%s;\n", |
8070f5c0 MD |
2295 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2296 | " { encoding = ASCII; }" : "", | |
2297 | field->name); | |
2298 | break; | |
f513b2bf MD |
2299 | case atype_struct: |
2300 | ret = _lttng_struct_statedump(session, field, nesting); | |
2301 | break; | |
2302 | case atype_array_compound: | |
2303 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2304 | break; | |
2305 | case atype_sequence_compound: | |
2306 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2307 | break; | |
65c85aa6 MD |
2308 | case atype_variant: |
2309 | ret = _lttng_variant_statedump(session, field, nesting); | |
2310 | break; | |
f513b2bf | 2311 | |
8070f5c0 MD |
2312 | default: |
2313 | WARN_ON_ONCE(1); | |
2314 | return -EINVAL; | |
2315 | } | |
2316 | return ret; | |
2317 | } | |
2318 | ||
2319 | static | |
a90917c3 | 2320 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2321 | struct lttng_ctx *ctx) |
2322 | { | |
2323 | int ret = 0; | |
2324 | int i; | |
2325 | ||
2326 | if (!ctx) | |
2327 | return 0; | |
2328 | for (i = 0; i < ctx->nr_fields; i++) { | |
2329 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2330 | ||
f513b2bf | 2331 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2332 | if (ret) |
2333 | return ret; | |
2334 | } | |
2335 | return ret; | |
2336 | } | |
2337 | ||
2338 | static | |
a90917c3 MD |
2339 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2340 | struct lttng_event *event) | |
8070f5c0 MD |
2341 | { |
2342 | const struct lttng_event_desc *desc = event->desc; | |
2343 | int ret = 0; | |
2344 | int i; | |
2345 | ||
2346 | for (i = 0; i < desc->nr_fields; i++) { | |
2347 | const struct lttng_event_field *field = &desc->fields[i]; | |
2348 | ||
f513b2bf | 2349 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2350 | if (ret) |
2351 | return ret; | |
c099397a MD |
2352 | } |
2353 | return ret; | |
2354 | } | |
2355 | ||
d83004aa JD |
2356 | /* |
2357 | * Must be called with sessions_mutex held. | |
695b3509 MD |
2358 | * The entire event metadata is printed as a single atomic metadata |
2359 | * transaction. | |
d83004aa | 2360 | */ |
c099397a | 2361 | static |
a90917c3 MD |
2362 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2363 | struct lttng_channel *chan, | |
2364 | struct lttng_event *event) | |
c099397a MD |
2365 | { |
2366 | int ret = 0; | |
2367 | ||
21ed5ea7 | 2368 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2369 | return 0; |
d83004aa | 2370 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2371 | return 0; |
2372 | ||
695b3509 MD |
2373 | lttng_metadata_begin(session); |
2374 | ||
c099397a MD |
2375 | ret = lttng_metadata_printf(session, |
2376 | "event {\n" | |
ae734547 | 2377 | " name = \"%s\";\n" |
c099397a | 2378 | " id = %u;\n" |
b9074a1b | 2379 | " stream_id = %u;\n", |
c099397a MD |
2380 | event->desc->name, |
2381 | event->id, | |
2382 | event->chan->id); | |
2383 | if (ret) | |
2384 | goto end; | |
2385 | ||
b9074a1b MD |
2386 | if (event->ctx) { |
2387 | ret = lttng_metadata_printf(session, | |
2388 | " context := struct {\n"); | |
2389 | if (ret) | |
2390 | goto end; | |
2391 | } | |
a90917c3 | 2392 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2393 | if (ret) |
2394 | goto end; | |
b9074a1b MD |
2395 | if (event->ctx) { |
2396 | ret = lttng_metadata_printf(session, | |
2397 | " };\n"); | |
2398 | if (ret) | |
2399 | goto end; | |
2400 | } | |
8070f5c0 MD |
2401 | |
2402 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2403 | " fields := struct {\n" |
2404 | ); | |
2405 | if (ret) | |
2406 | goto end; | |
2407 | ||
a90917c3 | 2408 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2409 | if (ret) |
2410 | goto end; | |
2411 | ||
2412 | /* | |
2413 | * LTTng space reservation can only reserve multiples of the | |
2414 | * byte size. | |
2415 | */ | |
2416 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2417 | " };\n" |
2418 | "};\n\n"); | |
c099397a MD |
2419 | if (ret) |
2420 | goto end; | |
2421 | ||
c099397a MD |
2422 | event->metadata_dumped = 1; |
2423 | end: | |
695b3509 | 2424 | lttng_metadata_end(session); |
c099397a MD |
2425 | return ret; |
2426 | ||
2427 | } | |
2428 | ||
d83004aa JD |
2429 | /* |
2430 | * Must be called with sessions_mutex held. | |
695b3509 MD |
2431 | * The entire channel metadata is printed as a single atomic metadata |
2432 | * transaction. | |
d83004aa | 2433 | */ |
c099397a | 2434 | static |
a90917c3 MD |
2435 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2436 | struct lttng_channel *chan) | |
c099397a MD |
2437 | { |
2438 | int ret = 0; | |
2439 | ||
21ed5ea7 | 2440 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2441 | return 0; |
d83004aa JD |
2442 | |
2443 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2444 | return 0; |
2445 | ||
695b3509 MD |
2446 | lttng_metadata_begin(session); |
2447 | ||
c099397a MD |
2448 | WARN_ON_ONCE(!chan->header_type); |
2449 | ret = lttng_metadata_printf(session, | |
2450 | "stream {\n" | |
2451 | " id = %u;\n" | |
9115fbdc | 2452 | " event.header := %s;\n" |
b9074a1b | 2453 | " packet.context := struct packet_context;\n", |
c099397a MD |
2454 | chan->id, |
2455 | chan->header_type == 1 ? "struct event_header_compact" : | |
2456 | "struct event_header_large"); | |
2457 | if (ret) | |
2458 | goto end; | |
2459 | ||
b9074a1b MD |
2460 | if (chan->ctx) { |
2461 | ret = lttng_metadata_printf(session, | |
2462 | " event.context := struct {\n"); | |
2463 | if (ret) | |
2464 | goto end; | |
2465 | } | |
a90917c3 | 2466 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2467 | if (ret) |
2468 | goto end; | |
b9074a1b MD |
2469 | if (chan->ctx) { |
2470 | ret = lttng_metadata_printf(session, | |
2471 | " };\n"); | |
2472 | if (ret) | |
2473 | goto end; | |
2474 | } | |
8070f5c0 MD |
2475 | |
2476 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2477 | "};\n\n"); |
8070f5c0 | 2478 | |
c099397a MD |
2479 | chan->metadata_dumped = 1; |
2480 | end: | |
695b3509 | 2481 | lttng_metadata_end(session); |
c099397a MD |
2482 | return ret; |
2483 | } | |
2484 | ||
d83004aa JD |
2485 | /* |
2486 | * Must be called with sessions_mutex held. | |
2487 | */ | |
9115fbdc | 2488 | static |
a90917c3 | 2489 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2490 | { |
2491 | return lttng_metadata_printf(session, | |
2492 | "struct packet_context {\n" | |
a3ccff4f MD |
2493 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2494 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2495 | " uint64_t content_size;\n" |
2496 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2497 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2498 | " unsigned long events_discarded;\n" |
9115fbdc | 2499 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2500 | "};\n\n" |
9115fbdc MD |
2501 | ); |
2502 | } | |
2503 | ||
2504 | /* | |
2505 | * Compact header: | |
2506 | * id: range: 0 - 30. | |
2507 | * id 31 is reserved to indicate an extended header. | |
2508 | * | |
2509 | * Large header: | |
2510 | * id: range: 0 - 65534. | |
2511 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2512 | * |
2513 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2514 | */ |
2515 | static | |
a90917c3 | 2516 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2517 | { |
2518 | return lttng_metadata_printf(session, | |
2519 | "struct event_header_compact {\n" | |
2520 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2521 | " variant <id> {\n" | |
2522 | " struct {\n" | |
a3ccff4f | 2523 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2524 | " } compact;\n" |
2525 | " struct {\n" | |
2526 | " uint32_t id;\n" | |
a3ccff4f | 2527 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2528 | " } extended;\n" |
2529 | " } v;\n" | |
2530 | "} align(%u);\n" | |
2531 | "\n" | |
2532 | "struct event_header_large {\n" | |
2533 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2534 | " variant <id> {\n" | |
2535 | " struct {\n" | |
a3ccff4f | 2536 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2537 | " } compact;\n" |
2538 | " struct {\n" | |
2539 | " uint32_t id;\n" | |
a3ccff4f | 2540 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2541 | " } extended;\n" |
2542 | " } v;\n" | |
2543 | "} align(%u);\n\n", | |
a90917c3 MD |
2544 | lttng_alignof(uint32_t) * CHAR_BIT, |
2545 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2546 | ); |
2547 | } | |
2548 | ||
a3ccff4f MD |
2549 | /* |
2550 | * Approximation of NTP time of day to clock monotonic correlation, | |
2551 | * taken at start of trace. | |
2552 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2553 | * in future versions. | |
5283350b MD |
2554 | * This function may return a negative offset. It may happen if the |
2555 | * system sets the REALTIME clock to 0 after boot. | |
25cc7051 MJ |
2556 | * |
2557 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2558 | * y2038 compliant. | |
a3ccff4f MD |
2559 | */ |
2560 | static | |
8967b2a3 | 2561 | int64_t measure_clock_offset(void) |
a3ccff4f | 2562 | { |
dcb93448 | 2563 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2564 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2565 | int64_t offset; |
a3ccff4f | 2566 | unsigned long flags; |
25cc7051 MJ |
2567 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2568 | struct timespec64 rts = { 0, 0 }; | |
2569 | #else | |
2570 | struct timespec rts = { 0, 0 }; | |
2571 | #endif | |
a3ccff4f MD |
2572 | |
2573 | /* Disable interrupts to increase correlation precision. */ | |
2574 | local_irq_save(flags); | |
2575 | monotonic[0] = trace_clock_read64(); | |
25cc7051 MJ |
2576 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2577 | ktime_get_real_ts64(&rts); | |
2578 | #else | |
216b6baa | 2579 | getnstimeofday(&rts); |
25cc7051 | 2580 | #endif |
a3ccff4f MD |
2581 | monotonic[1] = trace_clock_read64(); |
2582 | local_irq_restore(flags); | |
2583 | ||
dcb93448 | 2584 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2585 | realtime = (uint64_t) rts.tv_sec * tcf; |
2586 | if (tcf == NSEC_PER_SEC) { | |
2587 | realtime += rts.tv_nsec; | |
2588 | } else { | |
2589 | uint64_t n = rts.tv_nsec * tcf; | |
2590 | ||
2591 | do_div(n, NSEC_PER_SEC); | |
2592 | realtime += n; | |
2593 | } | |
dcb93448 | 2594 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2595 | return offset; |
2596 | } | |
2597 | ||
deba832d JR |
2598 | static |
2599 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2600 | { | |
2601 | int ret; | |
2602 | size_t i; | |
2603 | char cur; | |
2604 | ||
2605 | i = 0; | |
2606 | cur = string[i]; | |
2607 | while (cur != '\0') { | |
2608 | switch (cur) { | |
2609 | case '\n': | |
2610 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2611 | break; | |
2612 | case '\\': | |
2613 | case '"': | |
2614 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2615 | if (ret) | |
2616 | goto error; | |
2617 | /* We still print the current char */ | |
2618 | /* Fallthrough */ | |
2619 | default: | |
2620 | ret = lttng_metadata_printf(session, "%c", cur); | |
2621 | break; | |
2622 | } | |
2623 | ||
2624 | if (ret) | |
2625 | goto error; | |
2626 | ||
2627 | cur = string[++i]; | |
2628 | } | |
2629 | error: | |
2630 | return ret; | |
2631 | } | |
2632 | ||
2633 | static | |
a9550ab5 JR |
2634 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2635 | const char *field_value) | |
deba832d JR |
2636 | { |
2637 | int ret; | |
2638 | ||
a9550ab5 | 2639 | ret = lttng_metadata_printf(session, " %s = \"", field); |
deba832d JR |
2640 | if (ret) |
2641 | goto error; | |
2642 | ||
a9550ab5 | 2643 | ret = print_escaped_ctf_string(session, field_value); |
deba832d JR |
2644 | if (ret) |
2645 | goto error; | |
2646 | ||
2647 | ret = lttng_metadata_printf(session, "\";\n"); | |
2648 | ||
2649 | error: | |
2650 | return ret; | |
2651 | } | |
2652 | ||
c099397a MD |
2653 | /* |
2654 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2655 | * Must be called with sessions_mutex held. |
c099397a MD |
2656 | */ |
2657 | static | |
a90917c3 | 2658 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2659 | { |
30bdb6e4 | 2660 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2661 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2662 | struct lttng_channel *chan; |
2663 | struct lttng_event *event; | |
c099397a MD |
2664 | int ret = 0; |
2665 | ||
21ed5ea7 | 2666 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 2667 | return 0; |
695b3509 MD |
2668 | |
2669 | lttng_metadata_begin(session); | |
2670 | ||
c099397a MD |
2671 | if (session->metadata_dumped) |
2672 | goto skip_session; | |
c099397a | 2673 | |
d793d5e1 | 2674 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2675 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2676 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2677 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2678 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2679 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2680 | |
2681 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2682 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2683 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2684 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2685 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2686 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2687 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2688 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2689 | "\n" |
2690 | "trace {\n" | |
2691 | " major = %u;\n" | |
2692 | " minor = %u;\n" | |
30bdb6e4 | 2693 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2694 | " byte_order = %s;\n" |
2695 | " packet.header := struct {\n" | |
2696 | " uint32_t magic;\n" | |
1ec3f75a | 2697 | " uint8_t uuid[16];\n" |
d793d5e1 | 2698 | " uint32_t stream_id;\n" |
5594698f | 2699 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2700 | " };\n" |
d793d5e1 | 2701 | "};\n\n", |
a90917c3 MD |
2702 | lttng_alignof(uint8_t) * CHAR_BIT, |
2703 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2704 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2705 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2706 | sizeof(unsigned long) * CHAR_BIT, |
2707 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2708 | CTF_SPEC_MAJOR, |
2709 | CTF_SPEC_MINOR, | |
d793d5e1 | 2710 | uuid_s, |
5214fa50 | 2711 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2712 | "be" |
2713 | #else | |
2714 | "le" | |
2715 | #endif | |
2716 | ); | |
2717 | if (ret) | |
2718 | goto end; | |
2719 | ||
99dc9597 MD |
2720 | ret = lttng_metadata_printf(session, |
2721 | "env {\n" | |
a6058143 | 2722 | " hostname = \"%s\";\n" |
c6c9e10f | 2723 | " domain = \"kernel\";\n" |
99dc9597 | 2724 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2725 | " kernel_release = \"%s\";\n" |
2726 | " kernel_version = \"%s\";\n" | |
2727 | " tracer_name = \"lttng-modules\";\n" | |
2728 | " tracer_major = %d;\n" | |
2729 | " tracer_minor = %d;\n" | |
2730 | " tracer_patchlevel = %d;\n" | |
deba832d | 2731 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2732 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2733 | utsname()->sysname, |
2734 | utsname()->release, | |
c6c9e10f MD |
2735 | utsname()->version, |
2736 | LTTNG_MODULES_MAJOR_VERSION, | |
2737 | LTTNG_MODULES_MINOR_VERSION, | |
2738 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2739 | ); |
2740 | if (ret) | |
2741 | goto end; | |
2742 | ||
a9550ab5 JR |
2743 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2744 | if (ret) | |
2745 | goto end; | |
2746 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2747 | session->creation_time); | |
deba832d JR |
2748 | if (ret) |
2749 | goto end; | |
2750 | ||
2751 | /* Close env */ | |
2752 | ret = lttng_metadata_printf(session, "};\n\n"); | |
2753 | if (ret) | |
2754 | goto end; | |
2755 | ||
a3ccff4f MD |
2756 | ret = lttng_metadata_printf(session, |
2757 | "clock {\n" | |
2754583e MD |
2758 | " name = \"%s\";\n", |
2759 | trace_clock_name() | |
a82c63f1 MD |
2760 | ); |
2761 | if (ret) | |
2762 | goto end; | |
2763 | ||
2764 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2765 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2766 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2767 | clock_uuid_s |
2768 | ); | |
2769 | if (ret) | |
2770 | goto end; | |
2771 | } | |
2772 | ||
2773 | ret = lttng_metadata_printf(session, | |
2754583e | 2774 | " description = \"%s\";\n" |
a3ccff4f MD |
2775 | " freq = %llu; /* Frequency, in Hz */\n" |
2776 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2777 | " offset = %lld;\n" |
a3ccff4f | 2778 | "};\n\n", |
2754583e | 2779 | trace_clock_description(), |
a3ccff4f | 2780 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2781 | (long long) measure_clock_offset() |
a3ccff4f MD |
2782 | ); |
2783 | if (ret) | |
2784 | goto end; | |
2785 | ||
2786 | ret = lttng_metadata_printf(session, | |
2787 | "typealias integer {\n" | |
2788 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2789 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2790 | "} := uint27_clock_monotonic_t;\n" |
2791 | "\n" | |
2792 | "typealias integer {\n" | |
2793 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2794 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2795 | "} := uint32_clock_monotonic_t;\n" |
2796 | "\n" | |
2797 | "typealias integer {\n" | |
2798 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2799 | " map = clock.%s.value;\n" |
a3ccff4f | 2800 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2801 | trace_clock_name(), |
a3ccff4f | 2802 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2803 | trace_clock_name(), |
2804 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2805 | trace_clock_name() | |
a3ccff4f MD |
2806 | ); |
2807 | if (ret) | |
2808 | goto end; | |
2809 | ||
a90917c3 | 2810 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2811 | if (ret) |
2812 | goto end; | |
2813 | ||
a90917c3 | 2814 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2815 | if (ret) |
2816 | goto end; | |
2817 | ||
c099397a MD |
2818 | skip_session: |
2819 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2820 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2821 | if (ret) |
2822 | goto end; | |
2823 | } | |
2824 | ||
2825 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2826 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2827 | if (ret) |
2828 | goto end; | |
2829 | } | |
2830 | session->metadata_dumped = 1; | |
2831 | end: | |
695b3509 | 2832 | lttng_metadata_end(session); |
c099397a MD |
2833 | return ret; |
2834 | } | |
2835 | ||
c0e31d2e | 2836 | /** |
a90917c3 | 2837 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2838 | * @transport: transport structure |
2839 | * | |
2840 | * Registers a transport which can be used as output to extract the data out of | |
2841 | * LTTng. The module calling this registration function must ensure that no | |
2842 | * trap-inducing code will be executed by the transport functions. E.g. | |
da0fcb14 | 2843 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 2844 | * is made visible to the transport function. This registration acts as a |
da0fcb14 | 2845 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
2846 | * after its registration must it synchronize the TLBs. |
2847 | */ | |
a90917c3 | 2848 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2849 | { |
2850 | /* | |
2851 | * Make sure no page fault can be triggered by the module about to be | |
2852 | * registered. We deal with this here so we don't have to call | |
da0fcb14 | 2853 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 2854 | */ |
da0fcb14 | 2855 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
2856 | |
2857 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2858 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2859 | mutex_unlock(&sessions_mutex); |
2860 | } | |
a90917c3 | 2861 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2862 | |
2863 | /** | |
a90917c3 | 2864 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2865 | * @transport: transport structure |
2866 | */ | |
a90917c3 | 2867 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2868 | { |
2869 | mutex_lock(&sessions_mutex); | |
2870 | list_del(&transport->node); | |
2871 | mutex_unlock(&sessions_mutex); | |
2872 | } | |
a90917c3 | 2873 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2874 | |
b78104db | 2875 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2876 | |
2877 | enum cpuhp_state lttng_hp_prepare; | |
2878 | enum cpuhp_state lttng_hp_online; | |
2879 | ||
2880 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2881 | { | |
2882 | struct lttng_cpuhp_node *lttng_node; | |
2883 | ||
2884 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2885 | switch (lttng_node->component) { | |
2886 | case LTTNG_RING_BUFFER_FRONTEND: | |
2887 | return 0; | |
2888 | case LTTNG_RING_BUFFER_BACKEND: | |
2889 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2890 | case LTTNG_RING_BUFFER_ITER: | |
2891 | return 0; | |
2892 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2893 | return 0; | |
2894 | default: | |
2895 | return -EINVAL; | |
2896 | } | |
2897 | } | |
2898 | ||
2899 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2900 | { | |
2901 | struct lttng_cpuhp_node *lttng_node; | |
2902 | ||
2903 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2904 | switch (lttng_node->component) { | |
2905 | case LTTNG_RING_BUFFER_FRONTEND: | |
2906 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2907 | case LTTNG_RING_BUFFER_BACKEND: | |
2908 | return 0; | |
2909 | case LTTNG_RING_BUFFER_ITER: | |
2910 | return 0; | |
2911 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2912 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2913 | default: | |
2914 | return -EINVAL; | |
2915 | } | |
2916 | } | |
2917 | ||
2918 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2919 | { | |
2920 | struct lttng_cpuhp_node *lttng_node; | |
2921 | ||
2922 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2923 | switch (lttng_node->component) { | |
2924 | case LTTNG_RING_BUFFER_FRONTEND: | |
2925 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2926 | case LTTNG_RING_BUFFER_BACKEND: | |
2927 | return 0; | |
2928 | case LTTNG_RING_BUFFER_ITER: | |
2929 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2930 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2931 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2932 | default: | |
2933 | return -EINVAL; | |
2934 | } | |
2935 | } | |
2936 | ||
2937 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2938 | { | |
2939 | struct lttng_cpuhp_node *lttng_node; | |
2940 | ||
2941 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2942 | switch (lttng_node->component) { | |
2943 | case LTTNG_RING_BUFFER_FRONTEND: | |
2944 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2945 | case LTTNG_RING_BUFFER_BACKEND: | |
2946 | return 0; | |
2947 | case LTTNG_RING_BUFFER_ITER: | |
2948 | return 0; | |
2949 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2950 | return 0; | |
2951 | default: | |
2952 | return -EINVAL; | |
2953 | } | |
2954 | } | |
2955 | ||
2956 | static int __init lttng_init_cpu_hotplug(void) | |
2957 | { | |
2958 | int ret; | |
2959 | ||
2960 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2961 | lttng_hotplug_prepare, | |
2962 | lttng_hotplug_dead); | |
2963 | if (ret < 0) { | |
2964 | return ret; | |
2965 | } | |
2966 | lttng_hp_prepare = ret; | |
2967 | lttng_rb_set_hp_prepare(ret); | |
2968 | ||
2969 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2970 | lttng_hotplug_online, | |
2971 | lttng_hotplug_offline); | |
2972 | if (ret < 0) { | |
2973 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2974 | lttng_hp_prepare = 0; | |
2975 | return ret; | |
2976 | } | |
2977 | lttng_hp_online = ret; | |
2978 | lttng_rb_set_hp_online(ret); | |
2979 | ||
2980 | return 0; | |
2981 | } | |
2982 | ||
2983 | static void __exit lttng_exit_cpu_hotplug(void) | |
2984 | { | |
2985 | lttng_rb_set_hp_online(0); | |
2986 | cpuhp_remove_multi_state(lttng_hp_online); | |
2987 | lttng_rb_set_hp_prepare(0); | |
2988 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2989 | } | |
2990 | ||
b78104db | 2991 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2992 | static int lttng_init_cpu_hotplug(void) |
2993 | { | |
2994 | return 0; | |
2995 | } | |
2996 | static void lttng_exit_cpu_hotplug(void) | |
2997 | { | |
2998 | } | |
b78104db | 2999 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3000 | |
3001 | ||
a90917c3 | 3002 | static int __init lttng_events_init(void) |
4e3c1b9b | 3003 | { |
1c25284c MD |
3004 | int ret; |
3005 | ||
453b2495 JD |
3006 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3007 | if (ret) | |
3008 | return ret; | |
389d7070 | 3009 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3010 | if (ret) |
3011 | return ret; | |
3012 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3013 | if (ret) |
3014 | return ret; | |
3015 | ret = lttng_probes_init(); | |
389d7070 MD |
3016 | if (ret) |
3017 | return ret; | |
07dfc1d0 | 3018 | ret = lttng_context_init(); |
20591cf7 MD |
3019 | if (ret) |
3020 | return ret; | |
07dfc1d0 MD |
3021 | ret = lttng_tracepoint_init(); |
3022 | if (ret) | |
3023 | goto error_tp; | |
a90917c3 | 3024 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3025 | if (!event_cache) { |
3026 | ret = -ENOMEM; | |
3027 | goto error_kmem; | |
3028 | } | |
80996790 | 3029 | ret = lttng_abi_init(); |
02119ee5 MD |
3030 | if (ret) |
3031 | goto error_abi; | |
0c956676 MD |
3032 | ret = lttng_logger_init(); |
3033 | if (ret) | |
3034 | goto error_logger; | |
1e367326 MD |
3035 | ret = lttng_init_cpu_hotplug(); |
3036 | if (ret) | |
3037 | goto error_hotplug; | |
101215b7 | 3038 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3039 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3040 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3041 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3042 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3043 | LTTNG_VERSION_NAME, |
3044 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3045 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3046 | #else | |
3047 | "", | |
3048 | #endif | |
3049 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3050 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3051 | #else | |
3052 | ""); | |
3053 | #endif | |
4e3c1b9b | 3054 | return 0; |
0c956676 | 3055 | |
1e367326 MD |
3056 | error_hotplug: |
3057 | lttng_logger_exit(); | |
0c956676 MD |
3058 | error_logger: |
3059 | lttng_abi_exit(); | |
02119ee5 | 3060 | error_abi: |
1c25284c | 3061 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3062 | error_kmem: |
3063 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3064 | error_tp: |
3065 | lttng_context_exit(); | |
101215b7 | 3066 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3067 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3068 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3069 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3070 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3071 | LTTNG_VERSION_NAME, |
3072 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3073 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3074 | #else | |
3075 | "", | |
3076 | #endif | |
3077 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3078 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3079 | #else | |
3080 | ""); | |
3081 | #endif | |
1c25284c | 3082 | return ret; |
4e3c1b9b MD |
3083 | } |
3084 | ||
a90917c3 | 3085 | module_init(lttng_events_init); |
11b5a3c2 | 3086 | |
a90917c3 | 3087 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3088 | { |
a90917c3 | 3089 | struct lttng_session *session, *tmpsession; |
92e94819 | 3090 | |
1e367326 | 3091 | lttng_exit_cpu_hotplug(); |
0c956676 | 3092 | lttng_logger_exit(); |
80996790 | 3093 | lttng_abi_exit(); |
92e94819 | 3094 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3095 | lttng_session_destroy(session); |
11b5a3c2 | 3096 | kmem_cache_destroy(event_cache); |
20591cf7 | 3097 | lttng_tracepoint_exit(); |
07dfc1d0 | 3098 | lttng_context_exit(); |
101215b7 | 3099 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3100 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3101 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3102 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3103 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3104 | LTTNG_VERSION_NAME, |
3105 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3106 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3107 | #else | |
3108 | "", | |
3109 | #endif | |
3110 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3111 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3112 | #else | |
3113 | ""); | |
3114 | #endif | |
4e3c1b9b | 3115 | } |
92e94819 | 3116 | |
a90917c3 | 3117 | module_exit(lttng_events_exit); |
11b5a3c2 | 3118 | |
101215b7 MJ |
3119 | #include "extra_version/patches.i" |
3120 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3121 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3122 | #endif | |
3123 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3124 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3125 | #endif | |
92e94819 MD |
3126 | MODULE_LICENSE("GPL and additional rights"); |
3127 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3128 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3129 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3130 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3131 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3132 | LTTNG_MODULES_EXTRAVERSION); |