Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 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> |
c88f762e | 30 | #include <linux/dmi.h> |
3c997079 | 31 | |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 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> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
40 | #include <lttng/tracer.h> | |
41 | #include <lttng/abi-old.h> | |
42 | #include <lttng/endian.h> | |
43 | #include <lttng/string-utils.h> | |
24591303 MD |
44 | #include <ringbuffer/backend.h> |
45 | #include <ringbuffer/frontend.h> | |
3636085f | 46 | #include <wrapper/time.h> |
4e3c1b9b | 47 | |
d83004aa JD |
48 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
49 | ||
4e3c1b9b | 50 | static LIST_HEAD(sessions); |
a90917c3 | 51 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
52 | /* |
53 | * Protect the sessions and metadata caches. | |
54 | */ | |
4e3c1b9b MD |
55 | static DEFINE_MUTEX(sessions_mutex); |
56 | static struct kmem_cache *event_cache; | |
57 | ||
3c997079 MD |
58 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
59 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
60 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
61 | ||
a90917c3 MD |
62 | static void _lttng_event_destroy(struct lttng_event *event); |
63 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
64 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 65 | static |
a90917c3 MD |
66 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
67 | struct lttng_channel *chan, | |
68 | struct lttng_event *event); | |
c099397a | 69 | static |
a90917c3 | 70 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
71 | static |
72 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 73 | static |
ceabb767 MD |
74 | int _lttng_type_statedump(struct lttng_session *session, |
75 | const struct lttng_type *type, | |
76 | size_t nesting); | |
77 | static | |
f513b2bf MD |
78 | int _lttng_field_statedump(struct lttng_session *session, |
79 | const struct lttng_event_field *field, | |
80 | size_t nesting); | |
c099397a | 81 | |
c099397a | 82 | void synchronize_trace(void) |
abcca994 | 83 | { |
92da05ce MJ |
84 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
85 | synchronize_rcu(); | |
86 | #else | |
abcca994 | 87 | synchronize_sched(); |
92da05ce MJ |
88 | #endif |
89 | ||
b8590f40 MD |
90 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
91 | #ifdef CONFIG_PREEMPT_RT_FULL | |
92 | synchronize_rcu(); | |
93 | #endif | |
94 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
95 | #ifdef CONFIG_PREEMPT_RT |
96 | synchronize_rcu(); | |
97 | #endif | |
b8590f40 | 98 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
99 | } |
100 | ||
3c997079 MD |
101 | void lttng_lock_sessions(void) |
102 | { | |
103 | mutex_lock(&sessions_mutex); | |
104 | } | |
105 | ||
106 | void lttng_unlock_sessions(void) | |
107 | { | |
108 | mutex_unlock(&sessions_mutex); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Called with sessions lock held. | |
113 | */ | |
114 | int lttng_session_active(void) | |
115 | { | |
116 | struct lttng_session *iter; | |
117 | ||
118 | list_for_each_entry(iter, &sessions, list) { | |
119 | if (iter->active) | |
120 | return 1; | |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
a90917c3 | 125 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 126 | { |
a90917c3 | 127 | struct lttng_session *session; |
d83004aa | 128 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 129 | int i; |
4e3c1b9b MD |
130 | |
131 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 132 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 133 | if (!session) |
d83004aa | 134 | goto err; |
4e3c1b9b | 135 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 136 | INIT_LIST_HEAD(&session->events); |
a7008254 | 137 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
138 | |
139 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
140 | GFP_KERNEL); | |
141 | if (!metadata_cache) | |
142 | goto err_free_session; | |
0ca42eb7 | 143 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
144 | if (!metadata_cache->data) |
145 | goto err_free_cache; | |
146 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
147 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 148 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
149 | session->metadata_cache = metadata_cache; |
150 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
151 | memcpy(&metadata_cache->uuid, &session->uuid, |
152 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
153 | INIT_LIST_HEAD(&session->enablers_head); |
154 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
155 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 156 | list_add(&session->list, &sessions); |
d1f652f8 MD |
157 | session->pid_tracker.session = session; |
158 | session->pid_tracker.tracker_type = TRACKER_PID; | |
159 | session->vpid_tracker.session = session; | |
160 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
161 | session->uid_tracker.session = session; | |
162 | session->uid_tracker.tracker_type = TRACKER_UID; | |
163 | session->vuid_tracker.session = session; | |
164 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
165 | session->gid_tracker.session = session; | |
166 | session->gid_tracker.tracker_type = TRACKER_GID; | |
167 | session->vgid_tracker.session = session; | |
168 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
169 | mutex_unlock(&sessions_mutex); |
170 | return session; | |
d83004aa JD |
171 | |
172 | err_free_cache: | |
173 | kfree(metadata_cache); | |
174 | err_free_session: | |
48f5e0b5 | 175 | lttng_kvfree(session); |
d83004aa JD |
176 | err: |
177 | mutex_unlock(&sessions_mutex); | |
178 | return NULL; | |
179 | } | |
180 | ||
181 | void metadata_cache_destroy(struct kref *kref) | |
182 | { | |
183 | struct lttng_metadata_cache *cache = | |
184 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 185 | vfree(cache->data); |
d83004aa | 186 | kfree(cache); |
4e3c1b9b MD |
187 | } |
188 | ||
a90917c3 | 189 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 190 | { |
a90917c3 MD |
191 | struct lttng_channel *chan, *tmpchan; |
192 | struct lttng_event *event, *tmpevent; | |
d83004aa | 193 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 194 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 195 | int ret; |
4e3c1b9b MD |
196 | |
197 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 198 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
199 | list_for_each_entry(chan, &session->chan, list) { |
200 | ret = lttng_syscalls_unregister(chan); | |
201 | WARN_ON(ret); | |
202 | } | |
dda6a249 | 203 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 204 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
205 | WARN_ON(ret); |
206 | } | |
abcca994 | 207 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
208 | list_for_each_entry_safe(enabler, tmpenabler, |
209 | &session->enablers_head, node) | |
210 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 211 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 212 | _lttng_event_destroy(event); |
d83004aa JD |
213 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
214 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 215 | _lttng_channel_destroy(chan); |
d83004aa | 216 | } |
ab036a63 | 217 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
218 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
219 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 220 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
221 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
222 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
223 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
224 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
225 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
226 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 227 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
228 | list_del(&session->list); |
229 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 230 | lttng_kvfree(session); |
4e3c1b9b MD |
231 | } |
232 | ||
601252cf MD |
233 | int lttng_session_statedump(struct lttng_session *session) |
234 | { | |
235 | int ret; | |
236 | ||
237 | mutex_lock(&sessions_mutex); | |
238 | ret = lttng_statedump_start(session); | |
239 | mutex_unlock(&sessions_mutex); | |
240 | return ret; | |
241 | } | |
242 | ||
a90917c3 | 243 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
244 | { |
245 | int ret = 0; | |
a90917c3 | 246 | struct lttng_channel *chan; |
c0e31d2e MD |
247 | |
248 | mutex_lock(&sessions_mutex); | |
249 | if (session->active) { | |
250 | ret = -EBUSY; | |
251 | goto end; | |
252 | } | |
c099397a | 253 | |
3c997079 MD |
254 | /* Set transient enabler state to "enabled" */ |
255 | session->tstate = 1; | |
256 | ||
4ef81e4a MD |
257 | /* We need to sync enablers with session before activation. */ |
258 | lttng_session_sync_enablers(session); | |
259 | ||
c099397a MD |
260 | /* |
261 | * Snapshot the number of events per channel to know the type of header | |
262 | * we need to use. | |
263 | */ | |
264 | list_for_each_entry(chan, &session->chan, list) { | |
265 | if (chan->header_type) | |
266 | continue; /* don't change it if session stop/restart */ | |
267 | if (chan->free_event_id < 31) | |
268 | chan->header_type = 1; /* compact */ | |
269 | else | |
270 | chan->header_type = 2; /* large */ | |
271 | } | |
272 | ||
64af2437 | 273 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
274 | list_for_each_entry(chan, &session->chan, list) { |
275 | if (chan->channel_type != METADATA_CHANNEL) | |
276 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
277 | } | |
64af2437 | 278 | |
a8f2d0c7 MJ |
279 | WRITE_ONCE(session->active, 1); |
280 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 281 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 282 | if (ret) { |
a8f2d0c7 | 283 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
284 | goto end; |
285 | } | |
286 | ret = lttng_statedump_start(session); | |
360f38ea | 287 | if (ret) |
a8f2d0c7 | 288 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
289 | end: |
290 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 291 | return ret; |
c0e31d2e MD |
292 | } |
293 | ||
a90917c3 | 294 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
295 | { |
296 | int ret = 0; | |
64af2437 | 297 | struct lttng_channel *chan; |
c0e31d2e MD |
298 | |
299 | mutex_lock(&sessions_mutex); | |
300 | if (!session->active) { | |
301 | ret = -EBUSY; | |
302 | goto end; | |
303 | } | |
a8f2d0c7 | 304 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
305 | |
306 | /* Set transient enabler state to "disabled" */ | |
307 | session->tstate = 0; | |
308 | lttng_session_sync_enablers(session); | |
64af2437 MD |
309 | |
310 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
311 | list_for_each_entry(chan, &session->chan, list) { |
312 | if (chan->channel_type != METADATA_CHANNEL) | |
313 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
314 | } | |
c0e31d2e MD |
315 | end: |
316 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 317 | return ret; |
c0e31d2e MD |
318 | } |
319 | ||
9616f0bf JD |
320 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
321 | { | |
322 | int ret = 0; | |
323 | struct lttng_channel *chan; | |
324 | struct lttng_event *event; | |
325 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
326 | struct lttng_metadata_stream *stream; | |
327 | ||
328 | mutex_lock(&sessions_mutex); | |
329 | if (!session->active) { | |
330 | ret = -EBUSY; | |
331 | goto end; | |
332 | } | |
333 | ||
334 | mutex_lock(&cache->lock); | |
335 | memset(cache->data, 0, cache->cache_alloc); | |
336 | cache->metadata_written = 0; | |
337 | cache->version++; | |
338 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
339 | stream->metadata_out = 0; | |
340 | stream->metadata_in = 0; | |
341 | } | |
342 | mutex_unlock(&cache->lock); | |
343 | ||
344 | session->metadata_dumped = 0; | |
345 | list_for_each_entry(chan, &session->chan, list) { | |
346 | chan->metadata_dumped = 0; | |
347 | } | |
348 | ||
349 | list_for_each_entry(event, &session->events, list) { | |
350 | event->metadata_dumped = 0; | |
351 | } | |
352 | ||
353 | ret = _lttng_session_metadata_statedump(session); | |
354 | ||
355 | end: | |
356 | mutex_unlock(&sessions_mutex); | |
357 | return ret; | |
358 | } | |
359 | ||
a90917c3 | 360 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 361 | { |
3c997079 | 362 | int ret = 0; |
e64957da | 363 | |
3c997079 MD |
364 | mutex_lock(&sessions_mutex); |
365 | if (channel->channel_type == METADATA_CHANNEL) { | |
366 | ret = -EPERM; | |
367 | goto end; | |
368 | } | |
369 | if (channel->enabled) { | |
370 | ret = -EEXIST; | |
371 | goto end; | |
372 | } | |
373 | /* Set transient enabler state to "enabled" */ | |
374 | channel->tstate = 1; | |
375 | lttng_session_sync_enablers(channel->session); | |
376 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 377 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
378 | end: |
379 | mutex_unlock(&sessions_mutex); | |
380 | return ret; | |
e64957da MD |
381 | } |
382 | ||
a90917c3 | 383 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 384 | { |
3c997079 | 385 | int ret = 0; |
e64957da | 386 | |
3c997079 MD |
387 | mutex_lock(&sessions_mutex); |
388 | if (channel->channel_type == METADATA_CHANNEL) { | |
389 | ret = -EPERM; | |
390 | goto end; | |
391 | } | |
392 | if (!channel->enabled) { | |
393 | ret = -EEXIST; | |
394 | goto end; | |
395 | } | |
396 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 397 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
398 | /* Set transient enabler state to "enabled" */ |
399 | channel->tstate = 0; | |
400 | lttng_session_sync_enablers(channel->session); | |
401 | end: | |
402 | mutex_unlock(&sessions_mutex); | |
403 | return ret; | |
e64957da MD |
404 | } |
405 | ||
a90917c3 | 406 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 407 | { |
3c997079 | 408 | int ret = 0; |
e64957da | 409 | |
3c997079 MD |
410 | mutex_lock(&sessions_mutex); |
411 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
412 | ret = -EPERM; | |
413 | goto end; | |
414 | } | |
415 | if (event->enabled) { | |
416 | ret = -EEXIST; | |
417 | goto end; | |
418 | } | |
a0493bef MD |
419 | switch (event->instrumentation) { |
420 | case LTTNG_KERNEL_TRACEPOINT: | |
421 | case LTTNG_KERNEL_SYSCALL: | |
422 | ret = -EINVAL; | |
423 | break; | |
424 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 425 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 426 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 427 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
428 | break; |
429 | case LTTNG_KERNEL_KRETPROBE: | |
430 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
431 | break; | |
e884017c | 432 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
433 | default: |
434 | WARN_ON_ONCE(1); | |
435 | ret = -EINVAL; | |
436 | } | |
3c997079 MD |
437 | end: |
438 | mutex_unlock(&sessions_mutex); | |
439 | return ret; | |
e64957da MD |
440 | } |
441 | ||
a90917c3 | 442 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 443 | { |
3c997079 | 444 | int ret = 0; |
e64957da | 445 | |
3c997079 MD |
446 | mutex_lock(&sessions_mutex); |
447 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
448 | ret = -EPERM; | |
449 | goto end; | |
450 | } | |
451 | if (!event->enabled) { | |
452 | ret = -EEXIST; | |
453 | goto end; | |
454 | } | |
a0493bef MD |
455 | switch (event->instrumentation) { |
456 | case LTTNG_KERNEL_TRACEPOINT: | |
457 | case LTTNG_KERNEL_SYSCALL: | |
458 | ret = -EINVAL; | |
459 | break; | |
460 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 461 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 462 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 463 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
464 | break; |
465 | case LTTNG_KERNEL_KRETPROBE: | |
466 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
467 | break; | |
e884017c | 468 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
469 | default: |
470 | WARN_ON_ONCE(1); | |
471 | ret = -EINVAL; | |
472 | } | |
3c997079 MD |
473 | end: |
474 | mutex_unlock(&sessions_mutex); | |
475 | return ret; | |
e64957da MD |
476 | } |
477 | ||
a90917c3 | 478 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 479 | { |
a90917c3 | 480 | struct lttng_transport *transport; |
f3d01b96 | 481 | |
a90917c3 | 482 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
483 | if (!strcmp(transport->name, name)) |
484 | return transport; | |
485 | } | |
486 | return NULL; | |
487 | } | |
488 | ||
a90917c3 | 489 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
490 | const char *transport_name, |
491 | void *buf_addr, | |
4e3c1b9b MD |
492 | size_t subbuf_size, size_t num_subbuf, |
493 | unsigned int switch_timer_interval, | |
d83004aa JD |
494 | unsigned int read_timer_interval, |
495 | enum channel_type channel_type) | |
4e3c1b9b | 496 | { |
a90917c3 MD |
497 | struct lttng_channel *chan; |
498 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
499 | |
500 | mutex_lock(&sessions_mutex); | |
d83004aa | 501 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 502 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 503 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
504 | if (!transport) { |
505 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
506 | transport_name); | |
c0e31d2e | 507 | goto notransport; |
f3d01b96 | 508 | } |
a33c9927 MD |
509 | if (!try_module_get(transport->owner)) { |
510 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
511 | goto notransport; | |
512 | } | |
a90917c3 | 513 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 514 | if (!chan) |
c0e31d2e | 515 | goto nomem; |
4e3c1b9b | 516 | chan->session = session; |
05d32c64 | 517 | chan->id = session->free_chan_id++; |
3b731ab1 | 518 | chan->ops = &transport->ops; |
125b4df4 MD |
519 | /* |
520 | * Note: the channel creation op already writes into the packet | |
521 | * headers. Therefore the "chan" information used as input | |
522 | * should be already accessible. | |
523 | */ | |
5f5ddf01 MD |
524 | chan->chan = transport->ops.channel_create(transport_name, |
525 | chan, buf_addr, subbuf_size, num_subbuf, | |
526 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
527 | if (!chan->chan) |
528 | goto create_error; | |
3c997079 | 529 | chan->tstate = 1; |
e64957da | 530 | chan->enabled = 1; |
a33c9927 | 531 | chan->transport = transport; |
d83004aa | 532 | chan->channel_type = channel_type; |
4e3c1b9b MD |
533 | list_add(&chan->list, &session->chan); |
534 | mutex_unlock(&sessions_mutex); | |
535 | return chan; | |
536 | ||
f3d01b96 MD |
537 | create_error: |
538 | kfree(chan); | |
c0e31d2e | 539 | nomem: |
a33c9927 MD |
540 | if (transport) |
541 | module_put(transport->owner); | |
c0e31d2e | 542 | notransport: |
e5382b6d | 543 | active: |
4e3c1b9b MD |
544 | mutex_unlock(&sessions_mutex); |
545 | return NULL; | |
546 | } | |
547 | ||
548 | /* | |
d83004aa JD |
549 | * Only used internally at session destruction for per-cpu channels, and |
550 | * when metadata channel is released. | |
551 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 552 | */ |
aa7c23a9 | 553 | static |
a90917c3 | 554 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 555 | { |
11b5a3c2 | 556 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 557 | module_put(chan->transport->owner); |
4e3c1b9b | 558 | list_del(&chan->list); |
8070f5c0 | 559 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
560 | kfree(chan); |
561 | } | |
562 | ||
d83004aa JD |
563 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
564 | { | |
565 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
566 | ||
567 | /* Protect the metadata cache with the sessions_mutex. */ | |
568 | mutex_lock(&sessions_mutex); | |
569 | _lttng_channel_destroy(chan); | |
570 | mutex_unlock(&sessions_mutex); | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
573 | ||
574 | static | |
575 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
576 | { | |
577 | stream->finalized = 1; | |
578 | wake_up_interruptible(&stream->read_wait); | |
579 | } | |
580 | ||
e5382b6d MD |
581 | /* |
582 | * Supports event creation while tracing session is active. | |
3c997079 | 583 | * Needs to be called with sessions mutex held. |
e5382b6d | 584 | */ |
3c997079 MD |
585 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
586 | struct lttng_kernel_event *event_param, | |
587 | void *filter, | |
588 | const struct lttng_event_desc *event_desc, | |
589 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 590 | { |
3c997079 | 591 | struct lttng_session *session = chan->session; |
a90917c3 | 592 | struct lttng_event *event; |
3c997079 MD |
593 | const char *event_name; |
594 | struct hlist_head *head; | |
595 | size_t name_len; | |
596 | uint32_t hash; | |
3d084699 | 597 | int ret; |
4e3c1b9b | 598 | |
abc0446a | 599 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 600 | ret = -EMFILE; |
e5382b6d | 601 | goto full; |
abc0446a | 602 | } |
3c997079 MD |
603 | |
604 | switch (itype) { | |
605 | case LTTNG_KERNEL_TRACEPOINT: | |
606 | event_name = event_desc->name; | |
607 | break; | |
608 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 609 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 610 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 611 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 612 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
613 | event_name = event_param->name; |
614 | break; | |
e884017c | 615 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
616 | default: |
617 | WARN_ON_ONCE(1); | |
618 | ret = -EINVAL; | |
619 | goto type_error; | |
620 | } | |
621 | name_len = strlen(event_name); | |
622 | hash = jhash(event_name, name_len, 0); | |
623 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 624 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
625 | WARN_ON_ONCE(!event->desc); |
626 | if (!strncmp(event->desc->name, event_name, | |
627 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
628 | && chan == event->chan) { | |
629 | ret = -EEXIST; | |
630 | goto exist; | |
abc0446a MD |
631 | } |
632 | } | |
3c997079 | 633 | |
11b5a3c2 | 634 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 635 | if (!event) { |
4cf0bf51 | 636 | ret = -ENOMEM; |
4e3c1b9b | 637 | goto cache_error; |
abc0446a | 638 | } |
4e3c1b9b MD |
639 | event->chan = chan; |
640 | event->filter = filter; | |
e5382b6d | 641 | event->id = chan->free_event_id++; |
3c997079 MD |
642 | event->instrumentation = itype; |
643 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 644 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
645 | INIT_LIST_HEAD(&event->enablers_ref_head); |
646 | ||
647 | switch (itype) { | |
ab2277d6 | 648 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
649 | /* Event will be enabled by enabler sync. */ |
650 | event->enabled = 0; | |
651 | event->registered = 0; | |
652 | event->desc = lttng_event_get(event_name); | |
abc0446a | 653 | if (!event->desc) { |
4cf0bf51 | 654 | ret = -ENOENT; |
d3dbe23c | 655 | goto register_error; |
abc0446a | 656 | } |
3c997079 MD |
657 | /* Populate lttng_event structure before event registration. */ |
658 | smp_wmb(); | |
baf20995 | 659 | break; |
ab2277d6 | 660 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
661 | /* |
662 | * Needs to be explicitly enabled after creation, since | |
663 | * we may want to apply filters. | |
664 | */ | |
665 | event->enabled = 0; | |
3c997079 MD |
666 | event->registered = 1; |
667 | /* | |
668 | * Populate lttng_event structure before event | |
669 | * registration. | |
670 | */ | |
671 | smp_wmb(); | |
672 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
673 | event_param->u.kprobe.symbol_name, |
674 | event_param->u.kprobe.offset, | |
675 | event_param->u.kprobe.addr, | |
676 | event); | |
abc0446a | 677 | if (ret) { |
4cf0bf51 | 678 | ret = -EINVAL; |
d6d808f3 | 679 | goto register_error; |
abc0446a | 680 | } |
edeb3137 MD |
681 | ret = try_module_get(event->desc->owner); |
682 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 683 | break; |
7371f44c MD |
684 | case LTTNG_KERNEL_KRETPROBE: |
685 | { | |
a90917c3 | 686 | struct lttng_event *event_return; |
7371f44c MD |
687 | |
688 | /* kretprobe defines 2 events */ | |
a0493bef MD |
689 | /* |
690 | * Needs to be explicitly enabled after creation, since | |
691 | * we may want to apply filters. | |
692 | */ | |
693 | event->enabled = 0; | |
3c997079 | 694 | event->registered = 1; |
7371f44c MD |
695 | event_return = |
696 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 697 | if (!event_return) { |
4cf0bf51 | 698 | ret = -ENOMEM; |
7371f44c | 699 | goto register_error; |
abc0446a | 700 | } |
7371f44c MD |
701 | event_return->chan = chan; |
702 | event_return->filter = filter; | |
703 | event_return->id = chan->free_event_id++; | |
a0493bef | 704 | event_return->enabled = 0; |
3c997079 MD |
705 | event_return->registered = 1; |
706 | event_return->instrumentation = itype; | |
7371f44c | 707 | /* |
a90917c3 | 708 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
709 | */ |
710 | smp_wmb(); | |
3c997079 | 711 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
712 | event_param->u.kretprobe.symbol_name, |
713 | event_param->u.kretprobe.offset, | |
714 | event_param->u.kretprobe.addr, | |
715 | event, event_return); | |
716 | if (ret) { | |
717 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 718 | ret = -EINVAL; |
7371f44c MD |
719 | goto register_error; |
720 | } | |
721 | /* Take 2 refs on the module: one per event. */ | |
722 | ret = try_module_get(event->desc->owner); | |
723 | WARN_ON_ONCE(!ret); | |
724 | ret = try_module_get(event->desc->owner); | |
725 | WARN_ON_ONCE(!ret); | |
a90917c3 | 726 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 727 | event_return); |
abc0446a | 728 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
729 | if (ret) { |
730 | kmem_cache_free(event_cache, event_return); | |
731 | module_put(event->desc->owner); | |
732 | module_put(event->desc->owner); | |
733 | goto statedump_error; | |
734 | } | |
735 | list_add(&event_return->list, &chan->session->events); | |
736 | break; | |
737 | } | |
1ec65de1 | 738 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 739 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
740 | /* |
741 | * Needs to be explicitly enabled after creation, since | |
742 | * we may want to apply filters. | |
743 | */ | |
744 | event->enabled = 0; | |
3c997079 MD |
745 | event->registered = 0; |
746 | event->desc = event_desc; | |
abc0446a | 747 | if (!event->desc) { |
4cf0bf51 | 748 | ret = -EINVAL; |
259b6cb3 | 749 | goto register_error; |
abc0446a | 750 | } |
1ec65de1 | 751 | break; |
149b9a9d | 752 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
753 | /* |
754 | * Needs to be explicitly enabled after creation, since | |
755 | * we may want to apply filters. | |
756 | */ | |
757 | event->enabled = 0; | |
758 | event->registered = 1; | |
3aed4dca | 759 | |
a344f64b FD |
760 | /* |
761 | * Populate lttng_event structure before event | |
762 | * registration. | |
763 | */ | |
764 | smp_wmb(); | |
149b9a9d YB |
765 | |
766 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 767 | event_param->u.uprobe.fd, |
149b9a9d YB |
768 | event); |
769 | if (ret) | |
770 | goto register_error; | |
771 | ret = try_module_get(event->desc->owner); | |
772 | WARN_ON_ONCE(!ret); | |
773 | break; | |
e884017c | 774 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
775 | default: |
776 | WARN_ON_ONCE(1); | |
4cf0bf51 | 777 | ret = -EINVAL; |
df07930b | 778 | goto register_error; |
baf20995 | 779 | } |
a90917c3 | 780 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
781 | WARN_ON_ONCE(ret > 0); |
782 | if (ret) { | |
c099397a | 783 | goto statedump_error; |
abc0446a | 784 | } |
3c997079 | 785 | hlist_add_head(&event->hlist, head); |
dda6a249 | 786 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
787 | return event; |
788 | ||
c099397a | 789 | statedump_error: |
259b6cb3 | 790 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 791 | register_error: |
11b5a3c2 | 792 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
793 | cache_error: |
794 | exist: | |
3c997079 | 795 | type_error: |
e5382b6d | 796 | full: |
4cf0bf51 | 797 | return ERR_PTR(ret); |
4e3c1b9b MD |
798 | } |
799 | ||
3c997079 MD |
800 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
801 | struct lttng_kernel_event *event_param, | |
802 | void *filter, | |
803 | const struct lttng_event_desc *event_desc, | |
804 | enum lttng_kernel_instrumentation itype) | |
805 | { | |
806 | struct lttng_event *event; | |
807 | ||
808 | mutex_lock(&sessions_mutex); | |
809 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
810 | itype); | |
811 | mutex_unlock(&sessions_mutex); | |
812 | return event; | |
813 | } | |
814 | ||
815 | /* Only used for tracepoints for now. */ | |
816 | static | |
817 | void register_event(struct lttng_event *event) | |
818 | { | |
819 | const struct lttng_event_desc *desc; | |
f127e61e | 820 | int ret = -EINVAL; |
3c997079 | 821 | |
3c997079 MD |
822 | if (event->registered) |
823 | return; | |
4ecb5ad5 | 824 | |
3c997079 | 825 | desc = event->desc; |
4ecb5ad5 MD |
826 | switch (event->instrumentation) { |
827 | case LTTNG_KERNEL_TRACEPOINT: | |
828 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
829 | desc->probe_callback, | |
830 | event); | |
831 | break; | |
832 | case LTTNG_KERNEL_SYSCALL: | |
833 | ret = lttng_syscall_filter_enable(event->chan, | |
834 | desc->name); | |
835 | break; | |
836 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 837 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 838 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
839 | case LTTNG_KERNEL_NOOP: |
840 | ret = 0; | |
841 | break; | |
e884017c | 842 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
843 | default: |
844 | WARN_ON_ONCE(1); | |
845 | } | |
3c997079 MD |
846 | if (!ret) |
847 | event->registered = 1; | |
848 | } | |
849 | ||
4e3c1b9b MD |
850 | /* |
851 | * Only used internally at session destruction. | |
852 | */ | |
a90917c3 | 853 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 854 | { |
4ecb5ad5 | 855 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
856 | int ret = -EINVAL; |
857 | ||
3c997079 MD |
858 | if (!event->registered) |
859 | return 0; | |
860 | ||
4ecb5ad5 | 861 | desc = event->desc; |
38d024ae | 862 | switch (event->instrumentation) { |
ab2277d6 | 863 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 864 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 865 | event->desc->probe_callback, |
11b5a3c2 | 866 | event); |
baf20995 | 867 | break; |
ab2277d6 | 868 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 869 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
870 | ret = 0; |
871 | break; | |
7371f44c MD |
872 | case LTTNG_KERNEL_KRETPROBE: |
873 | lttng_kretprobes_unregister(event); | |
874 | ret = 0; | |
875 | break; | |
33a39a3c | 876 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
877 | ret = lttng_syscall_filter_disable(event->chan, |
878 | desc->name); | |
879 | break; | |
880 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
881 | ret = 0; |
882 | break; | |
149b9a9d YB |
883 | case LTTNG_KERNEL_UPROBE: |
884 | lttng_uprobes_unregister(event); | |
885 | ret = 0; | |
886 | break; | |
e884017c | 887 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
888 | default: |
889 | WARN_ON_ONCE(1); | |
890 | } | |
3c997079 MD |
891 | if (!ret) |
892 | event->registered = 0; | |
dda6a249 MD |
893 | return ret; |
894 | } | |
895 | ||
896 | /* | |
897 | * Only used internally at session destruction. | |
898 | */ | |
be066e6c | 899 | static |
a90917c3 | 900 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 901 | { |
edeb3137 MD |
902 | switch (event->instrumentation) { |
903 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 904 | lttng_event_put(event->desc); |
edeb3137 MD |
905 | break; |
906 | case LTTNG_KERNEL_KPROBE: | |
907 | module_put(event->desc->owner); | |
908 | lttng_kprobes_destroy_private(event); | |
909 | break; | |
7371f44c MD |
910 | case LTTNG_KERNEL_KRETPROBE: |
911 | module_put(event->desc->owner); | |
912 | lttng_kretprobes_destroy_private(event); | |
913 | break; | |
259b6cb3 | 914 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 915 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 916 | break; |
149b9a9d YB |
917 | case LTTNG_KERNEL_UPROBE: |
918 | module_put(event->desc->owner); | |
919 | lttng_uprobes_destroy_private(event); | |
920 | break; | |
e884017c | 921 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
922 | default: |
923 | WARN_ON_ONCE(1); | |
924 | } | |
dda6a249 | 925 | list_del(&event->list); |
8070f5c0 | 926 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 927 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
928 | } |
929 | ||
d1f652f8 MD |
930 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
931 | enum tracker_type tracker_type) | |
e0130fab | 932 | { |
d1f652f8 MD |
933 | switch (tracker_type) { |
934 | case TRACKER_PID: | |
935 | return &session->pid_tracker; | |
936 | case TRACKER_VPID: | |
937 | return &session->vpid_tracker; | |
938 | case TRACKER_UID: | |
939 | return &session->uid_tracker; | |
940 | case TRACKER_VUID: | |
941 | return &session->vuid_tracker; | |
942 | case TRACKER_GID: | |
943 | return &session->gid_tracker; | |
944 | case TRACKER_VGID: | |
945 | return &session->vgid_tracker; | |
946 | default: | |
947 | WARN_ON_ONCE(1); | |
948 | return NULL; | |
949 | } | |
950 | } | |
951 | ||
952 | int lttng_session_track_id(struct lttng_session *session, | |
953 | enum tracker_type tracker_type, int id) | |
954 | { | |
955 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
956 | int ret; |
957 | ||
d1f652f8 MD |
958 | tracker = get_tracker(session, tracker_type); |
959 | if (!tracker) | |
960 | return -EINVAL; | |
961 | if (id < -1) | |
e0130fab MD |
962 | return -EINVAL; |
963 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
964 | if (id == -1) { |
965 | /* track all ids: destroy tracker. */ | |
966 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
967 | ret = 0; |
968 | } else { | |
d1f652f8 | 969 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 970 | } |
e0130fab MD |
971 | mutex_unlock(&sessions_mutex); |
972 | return ret; | |
973 | } | |
974 | ||
d1f652f8 MD |
975 | int lttng_session_untrack_id(struct lttng_session *session, |
976 | enum tracker_type tracker_type, int id) | |
e0130fab | 977 | { |
d1f652f8 | 978 | struct lttng_id_tracker *tracker; |
e0130fab MD |
979 | int ret; |
980 | ||
d1f652f8 MD |
981 | tracker = get_tracker(session, tracker_type); |
982 | if (!tracker) | |
983 | return -EINVAL; | |
984 | if (id < -1) | |
e0130fab MD |
985 | return -EINVAL; |
986 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
987 | if (id == -1) { |
988 | /* untrack all ids: replace by empty tracker. */ | |
989 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 990 | } else { |
d1f652f8 | 991 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 992 | } |
e0130fab MD |
993 | mutex_unlock(&sessions_mutex); |
994 | return ret; | |
995 | } | |
996 | ||
7e6f9ef6 | 997 | static |
d1f652f8 | 998 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 999 | { |
d1f652f8 MD |
1000 | struct lttng_id_tracker *id_tracker = m->private; |
1001 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1002 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1003 | int iter = 0, i; |
1004 | ||
1005 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1006 | if (id_tracker_p) { |
1007 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1008 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1009 | |
f934e302 | 1010 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1011 | if (iter++ >= *pos) |
1012 | return e; | |
1013 | } | |
1014 | } | |
1015 | } else { | |
d1f652f8 | 1016 | /* ID tracker disabled. */ |
7e6f9ef6 | 1017 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1018 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1019 | } |
1020 | iter++; | |
1021 | } | |
1022 | /* End of list */ | |
1023 | return NULL; | |
1024 | } | |
1025 | ||
1026 | /* Called with sessions_mutex held. */ | |
1027 | static | |
d1f652f8 | 1028 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1029 | { |
d1f652f8 MD |
1030 | struct lttng_id_tracker *id_tracker = m->private; |
1031 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1032 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1033 | int iter = 0, i; |
1034 | ||
1035 | (*ppos)++; | |
d1f652f8 MD |
1036 | if (id_tracker_p) { |
1037 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1038 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1039 | |
f934e302 | 1040 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1041 | if (iter++ >= *ppos) |
1042 | return e; | |
1043 | } | |
1044 | } | |
1045 | } else { | |
d1f652f8 | 1046 | /* ID tracker disabled. */ |
7e6f9ef6 | 1047 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1048 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1049 | iter++; |
1050 | } | |
1051 | ||
1052 | /* End of list */ | |
1053 | return NULL; | |
1054 | } | |
1055 | ||
1056 | static | |
d1f652f8 | 1057 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1058 | { |
1059 | mutex_unlock(&sessions_mutex); | |
1060 | } | |
1061 | ||
1062 | static | |
d1f652f8 | 1063 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1064 | { |
d1f652f8 MD |
1065 | struct lttng_id_tracker *id_tracker = m->private; |
1066 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1067 | int id; | |
7e6f9ef6 | 1068 | |
d1f652f8 | 1069 | if (p == id_tracker_p) { |
7e6f9ef6 | 1070 | /* Tracker disabled. */ |
d1f652f8 | 1071 | id = -1; |
7e6f9ef6 | 1072 | } else { |
d1f652f8 | 1073 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1074 | |
d1f652f8 MD |
1075 | id = lttng_id_tracker_get_node_id(e); |
1076 | } | |
1077 | switch (id_tracker->tracker_type) { | |
1078 | case TRACKER_PID: | |
1079 | seq_printf(m, "process { pid = %d; };\n", id); | |
1080 | break; | |
1081 | case TRACKER_VPID: | |
1082 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1083 | break; | |
1084 | case TRACKER_UID: | |
1085 | seq_printf(m, "user { uid = %d; };\n", id); | |
1086 | break; | |
1087 | case TRACKER_VUID: | |
1088 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1089 | break; | |
1090 | case TRACKER_GID: | |
1091 | seq_printf(m, "group { gid = %d; };\n", id); | |
1092 | break; | |
1093 | case TRACKER_VGID: | |
1094 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1095 | break; | |
1096 | default: | |
1097 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1098 | } |
7e6f9ef6 MD |
1099 | return 0; |
1100 | } | |
1101 | ||
1102 | static | |
d1f652f8 MD |
1103 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1104 | .start = id_list_start, | |
1105 | .next = id_list_next, | |
1106 | .stop = id_list_stop, | |
1107 | .show = id_list_show, | |
7e6f9ef6 MD |
1108 | }; |
1109 | ||
1110 | static | |
d1f652f8 | 1111 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1112 | { |
d1f652f8 | 1113 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1114 | } |
1115 | ||
1116 | static | |
d1f652f8 | 1117 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1118 | { |
1119 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1120 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1121 | int ret; |
1122 | ||
d1f652f8 | 1123 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1124 | ret = seq_release(inode, file); |
d1f652f8 MD |
1125 | if (!ret) |
1126 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1127 | return ret; |
1128 | } | |
1129 | ||
d1f652f8 | 1130 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1131 | .owner = THIS_MODULE, |
d1f652f8 | 1132 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1133 | .read = seq_read, |
1134 | .llseek = seq_lseek, | |
d1f652f8 | 1135 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1136 | }; |
1137 | ||
d1f652f8 MD |
1138 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1139 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1140 | { |
d1f652f8 | 1141 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1142 | struct seq_file *m; |
1143 | int file_fd, ret; | |
1144 | ||
1145 | file_fd = lttng_get_unused_fd(); | |
1146 | if (file_fd < 0) { | |
1147 | ret = file_fd; | |
1148 | goto fd_error; | |
1149 | } | |
1150 | ||
d1f652f8 MD |
1151 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1152 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1153 | NULL, O_RDWR); |
d1f652f8 MD |
1154 | if (IS_ERR(tracker_ids_list_file)) { |
1155 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1156 | goto file_error; |
1157 | } | |
98d7281c MJ |
1158 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1159 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1160 | goto refcount_error; |
1161 | } | |
d1f652f8 | 1162 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1163 | if (ret < 0) |
1164 | goto open_error; | |
d1f652f8 MD |
1165 | m = tracker_ids_list_file->private_data; |
1166 | ||
1167 | m->private = get_tracker(session, tracker_type); | |
1168 | BUG_ON(!m->private); | |
1169 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1170 | |
1171 | return file_fd; | |
1172 | ||
1173 | open_error: | |
9c1f4643 MD |
1174 | atomic_long_dec(&session->file->f_count); |
1175 | refcount_error: | |
d1f652f8 | 1176 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1177 | file_error: |
1178 | put_unused_fd(file_fd); | |
1179 | fd_error: | |
1180 | return ret; | |
1181 | } | |
1182 | ||
3c997079 MD |
1183 | /* |
1184 | * Enabler management. | |
1185 | */ | |
1186 | static | |
4993071a PP |
1187 | int lttng_match_enabler_star_glob(const char *desc_name, |
1188 | const char *pattern) | |
3c997079 | 1189 | { |
cbc19040 MD |
1190 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1191 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1192 | return 0; |
1193 | return 1; | |
1194 | } | |
1195 | ||
1196 | static | |
4ecb5ad5 MD |
1197 | int lttng_match_enabler_name(const char *desc_name, |
1198 | const char *name) | |
3c997079 | 1199 | { |
4ecb5ad5 | 1200 | if (strcmp(desc_name, name)) |
3c997079 MD |
1201 | return 0; |
1202 | return 1; | |
1203 | } | |
1204 | ||
1205 | static | |
1206 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1207 | struct lttng_enabler *enabler) | |
1208 | { | |
4ecb5ad5 MD |
1209 | const char *desc_name, *enabler_name; |
1210 | ||
1211 | enabler_name = enabler->event_param.name; | |
1212 | switch (enabler->event_param.instrumentation) { | |
1213 | case LTTNG_KERNEL_TRACEPOINT: | |
1214 | desc_name = desc->name; | |
1215 | break; | |
1216 | case LTTNG_KERNEL_SYSCALL: | |
1217 | desc_name = desc->name; | |
1218 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1219 | desc_name += strlen("compat_"); | |
1220 | if (!strncmp(desc_name, "syscall_exit_", | |
1221 | strlen("syscall_exit_"))) { | |
1222 | desc_name += strlen("syscall_exit_"); | |
1223 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1224 | strlen("syscall_entry_"))) { | |
1225 | desc_name += strlen("syscall_entry_"); | |
1226 | } else { | |
1227 | WARN_ON_ONCE(1); | |
1228 | return -EINVAL; | |
1229 | } | |
1230 | break; | |
1231 | default: | |
1232 | WARN_ON_ONCE(1); | |
1233 | return -EINVAL; | |
1234 | } | |
3c997079 | 1235 | switch (enabler->type) { |
4993071a PP |
1236 | case LTTNG_ENABLER_STAR_GLOB: |
1237 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1238 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1239 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1240 | default: |
1241 | return -EINVAL; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | static | |
1246 | int lttng_event_match_enabler(struct lttng_event *event, | |
1247 | struct lttng_enabler *enabler) | |
1248 | { | |
33a39a3c MD |
1249 | if (enabler->event_param.instrumentation != event->instrumentation) |
1250 | return 0; | |
3c997079 MD |
1251 | if (lttng_desc_match_enabler(event->desc, enabler) |
1252 | && event->chan == enabler->chan) | |
1253 | return 1; | |
1254 | else | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static | |
1259 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1260 | struct lttng_enabler *enabler) | |
1261 | { | |
1262 | struct lttng_enabler_ref *enabler_ref; | |
1263 | ||
1264 | list_for_each_entry(enabler_ref, | |
1265 | &event->enablers_ref_head, node) { | |
1266 | if (enabler_ref->ref == enabler) | |
1267 | return enabler_ref; | |
1268 | } | |
1269 | return NULL; | |
1270 | } | |
1271 | ||
3c997079 | 1272 | static |
33a39a3c | 1273 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1274 | { |
1275 | struct lttng_session *session = enabler->chan->session; | |
1276 | struct lttng_probe_desc *probe_desc; | |
1277 | const struct lttng_event_desc *desc; | |
1278 | int i; | |
1279 | struct list_head *probe_list; | |
1280 | ||
1281 | probe_list = lttng_get_probe_list_head(); | |
1282 | /* | |
1283 | * For each probe event, if we find that a probe event matches | |
1284 | * our enabler, create an associated lttng_event if not | |
1285 | * already present. | |
1286 | */ | |
1287 | list_for_each_entry(probe_desc, probe_list, head) { | |
1288 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1289 | int found = 0; | |
1290 | struct hlist_head *head; | |
1291 | const char *event_name; | |
1292 | size_t name_len; | |
1293 | uint32_t hash; | |
1294 | struct lttng_event *event; | |
1295 | ||
1296 | desc = probe_desc->event_desc[i]; | |
1297 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1298 | continue; | |
1299 | event_name = desc->name; | |
1300 | name_len = strlen(event_name); | |
1301 | ||
1302 | /* | |
1303 | * Check if already created. | |
1304 | */ | |
1305 | hash = jhash(event_name, name_len, 0); | |
1306 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1307 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1308 | if (event->desc == desc |
1309 | && event->chan == enabler->chan) | |
1310 | found = 1; | |
1311 | } | |
1312 | if (found) | |
1313 | continue; | |
1314 | ||
1315 | /* | |
1316 | * We need to create an event for this | |
1317 | * event probe. | |
1318 | */ | |
1319 | event = _lttng_event_create(enabler->chan, | |
1320 | NULL, NULL, desc, | |
1321 | LTTNG_KERNEL_TRACEPOINT); | |
1322 | if (!event) { | |
1323 | printk(KERN_INFO "Unable to create event %s\n", | |
1324 | probe_desc->event_desc[i]->name); | |
1325 | } | |
1326 | } | |
1327 | } | |
1328 | } | |
1329 | ||
33a39a3c MD |
1330 | static |
1331 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1332 | { | |
1333 | int ret; | |
1334 | ||
1335 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1336 | WARN_ON_ONCE(ret); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Create struct lttng_event if it is missing and present in the list of | |
1341 | * tracepoint probes. | |
1342 | * Should be called with sessions mutex held. | |
1343 | */ | |
1344 | static | |
1345 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1346 | { | |
1347 | switch (enabler->event_param.instrumentation) { | |
1348 | case LTTNG_KERNEL_TRACEPOINT: | |
1349 | lttng_create_tracepoint_if_missing(enabler); | |
1350 | break; | |
1351 | case LTTNG_KERNEL_SYSCALL: | |
1352 | lttng_create_syscall_if_missing(enabler); | |
1353 | break; | |
1354 | default: | |
1355 | WARN_ON_ONCE(1); | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | ||
3c997079 MD |
1360 | /* |
1361 | * Create events associated with an enabler (if not already present), | |
1362 | * and add backward reference from the event to the enabler. | |
1363 | * Should be called with sessions mutex held. | |
1364 | */ | |
1365 | static | |
1366 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1367 | { | |
1368 | struct lttng_session *session = enabler->chan->session; | |
1369 | struct lttng_event *event; | |
1370 | ||
1371 | /* First ensure that probe events are created for this enabler. */ | |
1372 | lttng_create_event_if_missing(enabler); | |
1373 | ||
1374 | /* For each event matching enabler in session event list. */ | |
1375 | list_for_each_entry(event, &session->events, list) { | |
1376 | struct lttng_enabler_ref *enabler_ref; | |
1377 | ||
1378 | if (!lttng_event_match_enabler(event, enabler)) | |
1379 | continue; | |
1380 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1381 | if (!enabler_ref) { | |
1382 | /* | |
1383 | * If no backward ref, create it. | |
1384 | * Add backward ref from event to enabler. | |
1385 | */ | |
1386 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1387 | if (!enabler_ref) | |
1388 | return -ENOMEM; | |
1389 | enabler_ref->ref = enabler; | |
1390 | list_add(&enabler_ref->node, | |
1391 | &event->enablers_ref_head); | |
1392 | } | |
1393 | ||
f127e61e MD |
1394 | /* |
1395 | * Link filter bytecodes if not linked yet. | |
1396 | */ | |
1397 | lttng_enabler_event_link_bytecode(event, enabler); | |
1398 | ||
3c997079 MD |
1399 | /* TODO: merge event context. */ |
1400 | } | |
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | /* | |
1405 | * Called at module load: connect the probe on all enablers matching | |
1406 | * this event. | |
1407 | * Called with sessions lock held. | |
1408 | */ | |
1409 | int lttng_fix_pending_events(void) | |
1410 | { | |
1411 | struct lttng_session *session; | |
1412 | ||
1413 | list_for_each_entry(session, &sessions, list) | |
1414 | lttng_session_lazy_sync_enablers(session); | |
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1419 | struct lttng_kernel_event *event_param, | |
1420 | struct lttng_channel *chan) | |
1421 | { | |
1422 | struct lttng_enabler *enabler; | |
1423 | ||
1424 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1425 | if (!enabler) | |
1426 | return NULL; | |
1427 | enabler->type = type; | |
07dfc1d0 | 1428 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1429 | memcpy(&enabler->event_param, event_param, |
1430 | sizeof(enabler->event_param)); | |
1431 | enabler->chan = chan; | |
1432 | /* ctx left NULL */ | |
4fd19d8a | 1433 | enabler->enabled = 0; |
3c997079 MD |
1434 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1435 | mutex_lock(&sessions_mutex); | |
1436 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1437 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1438 | mutex_unlock(&sessions_mutex); | |
1439 | return enabler; | |
1440 | } | |
1441 | ||
1442 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1443 | { | |
1444 | mutex_lock(&sessions_mutex); | |
1445 | enabler->enabled = 1; | |
1446 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1447 | mutex_unlock(&sessions_mutex); | |
1448 | return 0; | |
1449 | } | |
1450 | ||
1451 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1452 | { | |
1453 | mutex_lock(&sessions_mutex); | |
1454 | enabler->enabled = 0; | |
1455 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1456 | mutex_unlock(&sessions_mutex); | |
1457 | return 0; | |
1458 | } | |
1459 | ||
07dfc1d0 MD |
1460 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1461 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1462 | { | |
1463 | struct lttng_filter_bytecode_node *bytecode_node; | |
1464 | uint32_t bytecode_len; | |
1465 | int ret; | |
1466 | ||
1467 | ret = get_user(bytecode_len, &bytecode->len); | |
1468 | if (ret) | |
1469 | return ret; | |
1470 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1471 | GFP_KERNEL); | |
1472 | if (!bytecode_node) | |
1473 | return -ENOMEM; | |
1474 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1475 | sizeof(*bytecode) + bytecode_len); | |
1476 | if (ret) | |
1477 | goto error_free; | |
1478 | bytecode_node->enabler = enabler; | |
1479 | /* Enforce length based on allocated size */ | |
1480 | bytecode_node->bc.len = bytecode_len; | |
1481 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1482 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1483 | return 0; | |
1484 | ||
1485 | error_free: | |
1486 | kfree(bytecode_node); | |
1487 | return ret; | |
1488 | } | |
1489 | ||
3aed4dca FD |
1490 | int lttng_event_add_callsite(struct lttng_event *event, |
1491 | struct lttng_kernel_event_callsite __user *callsite) | |
1492 | { | |
1493 | ||
1494 | switch (event->instrumentation) { | |
1495 | case LTTNG_KERNEL_UPROBE: | |
1496 | return lttng_uprobes_add_callsite(event, callsite); | |
1497 | default: | |
1498 | return -EINVAL; | |
1499 | } | |
1500 | } | |
1501 | ||
3c997079 MD |
1502 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1503 | struct lttng_kernel_context *context_param) | |
1504 | { | |
1505 | return -ENOSYS; | |
1506 | } | |
1507 | ||
1508 | static | |
1509 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1510 | { | |
07dfc1d0 MD |
1511 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1512 | ||
1513 | /* Destroy filter bytecode */ | |
1514 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1515 | &enabler->filter_bytecode_head, node) { | |
1516 | kfree(filter_node); | |
1517 | } | |
1518 | ||
3c997079 MD |
1519 | /* Destroy contexts */ |
1520 | lttng_destroy_context(enabler->ctx); | |
1521 | ||
1522 | list_del(&enabler->node); | |
1523 | kfree(enabler); | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * lttng_session_sync_enablers should be called just before starting a | |
1528 | * session. | |
1529 | * Should be called with sessions mutex held. | |
1530 | */ | |
1531 | static | |
1532 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1533 | { | |
1534 | struct lttng_enabler *enabler; | |
1535 | struct lttng_event *event; | |
1536 | ||
1537 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1538 | lttng_enabler_ref_events(enabler); | |
1539 | /* | |
1540 | * For each event, if at least one of its enablers is enabled, | |
1541 | * and its channel and session transient states are enabled, we | |
1542 | * enable the event, else we disable it. | |
1543 | */ | |
1544 | list_for_each_entry(event, &session->events, list) { | |
1545 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1546 | struct lttng_bytecode_runtime *runtime; |
1547 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1548 | |
4ecb5ad5 MD |
1549 | switch (event->instrumentation) { |
1550 | case LTTNG_KERNEL_TRACEPOINT: | |
1551 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1552 | /* Enable events */ |
1553 | list_for_each_entry(enabler_ref, | |
1554 | &event->enablers_ref_head, node) { | |
1555 | if (enabler_ref->ref->enabled) { | |
1556 | enabled = 1; | |
1557 | break; | |
1558 | } | |
1559 | } | |
4ecb5ad5 MD |
1560 | break; |
1561 | default: | |
3c997079 MD |
1562 | /* Not handled with lazy sync. */ |
1563 | continue; | |
1564 | } | |
1565 | /* | |
1566 | * Enabled state is based on union of enablers, with | |
1567 | * intesection of session and channel transient enable | |
1568 | * states. | |
1569 | */ | |
1570 | enabled = enabled && session->tstate && event->chan->tstate; | |
1571 | ||
a8f2d0c7 | 1572 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1573 | /* |
1574 | * Sync tracepoint registration with event enabled | |
1575 | * state. | |
1576 | */ | |
1577 | if (enabled) { | |
1578 | register_event(event); | |
1579 | } else { | |
1580 | _lttng_event_unregister(event); | |
1581 | } | |
07dfc1d0 MD |
1582 | |
1583 | /* Check if has enablers without bytecode enabled */ | |
1584 | list_for_each_entry(enabler_ref, | |
1585 | &event->enablers_ref_head, node) { | |
1586 | if (enabler_ref->ref->enabled | |
1587 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1588 | has_enablers_without_bytecode = 1; | |
1589 | break; | |
1590 | } | |
1591 | } | |
1592 | event->has_enablers_without_bytecode = | |
1593 | has_enablers_without_bytecode; | |
1594 | ||
1595 | /* Enable filters */ | |
1596 | list_for_each_entry(runtime, | |
f127e61e | 1597 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1598 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1599 | } |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * Apply enablers to session events, adding events to session if need | |
1604 | * be. It is required after each modification applied to an active | |
1605 | * session, and right before session "start". | |
1606 | * "lazy" sync means we only sync if required. | |
1607 | * Should be called with sessions mutex held. | |
1608 | */ | |
1609 | static | |
1610 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1611 | { | |
1612 | /* We can skip if session is not active */ | |
1613 | if (!session->active) | |
1614 | return; | |
1615 | lttng_session_sync_enablers(session); | |
1616 | } | |
1617 | ||
1ec3f75a | 1618 | /* |
d83004aa JD |
1619 | * Serialize at most one packet worth of metadata into a metadata |
1620 | * channel. | |
92d9f5e6 MD |
1621 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1622 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1623 | * allows us to do racy operations such as looking for remaining space left in | |
1624 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1625 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1626 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1627 | * Returns the number of bytes written in the channel, 0 if no data |
1628 | * was written and a negative value on error. | |
1ec3f75a | 1629 | */ |
b3b8072b | 1630 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 1631 | struct channel *chan, bool *coherent) |
d83004aa JD |
1632 | { |
1633 | struct lib_ring_buffer_ctx ctx; | |
1634 | int ret = 0; | |
1635 | size_t len, reserve_len; | |
1636 | ||
f613e3e6 | 1637 | /* |
92d9f5e6 MD |
1638 | * Ensure we support mutiple get_next / put sequences followed by |
1639 | * put_next. The metadata cache lock protects reading the metadata | |
1640 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1641 | * "flush" operations on the buffer invoked by different processes. | |
1642 | * Moreover, since the metadata cache memory can be reallocated, we | |
1643 | * need to have exclusive access against updates even though we only | |
1644 | * read it. | |
f613e3e6 | 1645 | */ |
92d9f5e6 | 1646 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1647 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1648 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1649 | goto end; |
f613e3e6 | 1650 | |
9616f0bf JD |
1651 | /* Metadata regenerated, change the version. */ |
1652 | if (stream->metadata_cache->version != stream->version) | |
1653 | stream->version = stream->metadata_cache->version; | |
1654 | ||
d83004aa | 1655 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1656 | stream->metadata_in; |
9de2c215 | 1657 | if (!len) |
de23d59d | 1658 | goto end; |
d83004aa | 1659 | reserve_len = min_t(size_t, |
b3b8072b | 1660 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1661 | len); |
b3b8072b | 1662 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1663 | sizeof(char), -1); |
1664 | /* | |
1665 | * If reservation failed, return an error to the caller. | |
1666 | */ | |
b3b8072b | 1667 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1668 | if (ret != 0) { |
1669 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 1670 | stream->coherent = false; |
d83004aa JD |
1671 | goto end; |
1672 | } | |
b3b8072b | 1673 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1674 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1675 | reserve_len); |
b3b8072b | 1676 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1677 | stream->metadata_in += reserve_len; |
3e75e2a7 | 1678 | if (reserve_len < len) |
8b97fd42 MD |
1679 | stream->coherent = false; |
1680 | else | |
1681 | stream->coherent = true; | |
d83004aa JD |
1682 | ret = reserve_len; |
1683 | ||
1684 | end: | |
8b97fd42 MD |
1685 | if (coherent) |
1686 | *coherent = stream->coherent; | |
92d9f5e6 | 1687 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1688 | return ret; |
1689 | } | |
1690 | ||
8b97fd42 MD |
1691 | static |
1692 | void lttng_metadata_begin(struct lttng_session *session) | |
1693 | { | |
3e75e2a7 MD |
1694 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1695 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
1696 | } |
1697 | ||
1698 | static | |
1699 | void lttng_metadata_end(struct lttng_session *session) | |
1700 | { | |
3e75e2a7 MD |
1701 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1702 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1703 | struct lttng_metadata_stream *stream; | |
1704 | ||
3e75e2a7 MD |
1705 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1706 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 1707 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 1708 | } |
8b97fd42 MD |
1709 | } |
1710 | ||
d83004aa JD |
1711 | /* |
1712 | * Write the metadata to the metadata cache. | |
1713 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1714 | * The metadata cache lock protects us from concurrent read access from |
1715 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
1716 | * The content of the printf is printed as a single atomic metadata |
1717 | * transaction. | |
d83004aa | 1718 | */ |
a90917c3 | 1719 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1720 | const char *fmt, ...) |
1721 | { | |
c099397a | 1722 | char *str; |
d83004aa | 1723 | size_t len; |
c099397a MD |
1724 | va_list ap; |
1725 | ||
a8f2d0c7 | 1726 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1727 | |
1728 | va_start(ap, fmt); | |
1729 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1730 | va_end(ap); | |
1731 | if (!str) | |
1732 | return -ENOMEM; | |
1733 | ||
1ec3f75a | 1734 | len = strlen(str); |
3e75e2a7 | 1735 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1736 | if (session->metadata_cache->metadata_written + len > |
1737 | session->metadata_cache->cache_alloc) { | |
1738 | char *tmp_cache_realloc; | |
1739 | unsigned int tmp_cache_alloc_size; | |
1740 | ||
1741 | tmp_cache_alloc_size = max_t(unsigned int, | |
1742 | session->metadata_cache->cache_alloc + len, | |
1743 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1744 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1745 | if (!tmp_cache_realloc) |
1746 | goto err; | |
a606b6e8 ML |
1747 | if (session->metadata_cache->data) { |
1748 | memcpy(tmp_cache_realloc, | |
1749 | session->metadata_cache->data, | |
1750 | session->metadata_cache->cache_alloc); | |
1751 | vfree(session->metadata_cache->data); | |
1752 | } | |
1753 | ||
d83004aa JD |
1754 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1755 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1756 | } |
d83004aa JD |
1757 | memcpy(session->metadata_cache->data + |
1758 | session->metadata_cache->metadata_written, | |
1759 | str, len); | |
1760 | session->metadata_cache->metadata_written += len; | |
c099397a | 1761 | kfree(str); |
d83004aa | 1762 | |
d83004aa JD |
1763 | return 0; |
1764 | ||
1765 | err: | |
1766 | kfree(str); | |
1767 | return -ENOMEM; | |
c099397a MD |
1768 | } |
1769 | ||
f513b2bf MD |
1770 | static |
1771 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1772 | { | |
1773 | size_t i; | |
1774 | ||
1775 | for (i = 0; i < nesting; i++) { | |
1776 | int ret; | |
1777 | ||
1778 | ret = lttng_metadata_printf(session, " "); | |
1779 | if (ret) { | |
1780 | return ret; | |
1781 | } | |
1782 | } | |
1783 | return 0; | |
1784 | } | |
1785 | ||
ceabb767 MD |
1786 | static |
1787 | int lttng_field_name_statedump(struct lttng_session *session, | |
1788 | const struct lttng_event_field *field, | |
1789 | size_t nesting) | |
1790 | { | |
1791 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1792 | } | |
1793 | ||
1794 | static | |
1795 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1796 | const struct lttng_type *type, | |
1797 | size_t nesting) | |
1798 | { | |
1799 | int ret; | |
1800 | ||
1801 | WARN_ON_ONCE(type->atype != atype_integer); | |
1802 | ret = print_tabs(session, nesting); | |
1803 | if (ret) | |
1804 | return ret; | |
1805 | ret = lttng_metadata_printf(session, | |
1806 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1807 | type->u.integer.size, | |
1808 | type->u.integer.alignment, | |
1809 | type->u.integer.signedness, | |
1810 | (type->u.integer.encoding == lttng_encode_none) | |
1811 | ? "none" | |
1812 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1813 | ? "UTF8" | |
1814 | : "ASCII", | |
1815 | type->u.integer.base, | |
1816 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1817 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1818 | #else | |
1819 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1820 | #endif | |
1821 | ); | |
1822 | return ret; | |
1823 | } | |
1824 | ||
f513b2bf MD |
1825 | /* |
1826 | * Must be called with sessions_mutex held. | |
1827 | */ | |
1828 | static | |
1829 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1830 | const struct lttng_type *type, | |
1831 | size_t nesting) | |
1832 | { | |
1833 | int ret; | |
1834 | uint32_t i, nr_fields; | |
ceabb767 MD |
1835 | unsigned int alignment; |
1836 | ||
1837 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1838 | |
1839 | ret = print_tabs(session, nesting); | |
1840 | if (ret) | |
1841 | return ret; | |
1842 | ret = lttng_metadata_printf(session, | |
1843 | "struct {\n"); | |
1844 | if (ret) | |
1845 | return ret; | |
ceabb767 | 1846 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1847 | for (i = 0; i < nr_fields; i++) { |
1848 | const struct lttng_event_field *iter_field; | |
1849 | ||
ceabb767 | 1850 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1851 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1852 | if (ret) | |
1853 | return ret; | |
1854 | } | |
1855 | ret = print_tabs(session, nesting); | |
1856 | if (ret) | |
1857 | return ret; | |
ceabb767 MD |
1858 | alignment = type->u.struct_nestable.alignment; |
1859 | if (alignment) { | |
1860 | ret = lttng_metadata_printf(session, | |
1861 | "} align(%u)", | |
1862 | alignment); | |
1863 | } else { | |
1864 | ret = lttng_metadata_printf(session, | |
1865 | "}"); | |
1866 | } | |
f513b2bf MD |
1867 | return ret; |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * Must be called with sessions_mutex held. | |
1872 | */ | |
1873 | static | |
ceabb767 | 1874 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1875 | const struct lttng_event_field *field, |
1876 | size_t nesting) | |
1877 | { | |
1878 | int ret; | |
1879 | ||
1880 | ret = _lttng_struct_type_statedump(session, | |
1881 | &field->type, nesting); | |
1882 | if (ret) | |
1883 | return ret; | |
ceabb767 | 1884 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
1885 | } |
1886 | ||
65c85aa6 MD |
1887 | /* |
1888 | * Must be called with sessions_mutex held. | |
1889 | */ | |
1890 | static | |
1891 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1892 | const struct lttng_type *type, | |
1893 | size_t nesting) | |
1894 | { | |
1895 | int ret; | |
1896 | uint32_t i, nr_choices; | |
1897 | ||
ceabb767 MD |
1898 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
1899 | /* | |
1900 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
1901 | */ | |
1902 | if (type->u.variant_nestable.alignment != 0) | |
1903 | return -EINVAL; | |
65c85aa6 MD |
1904 | ret = print_tabs(session, nesting); |
1905 | if (ret) | |
1906 | return ret; | |
1907 | ret = lttng_metadata_printf(session, | |
1908 | "variant <_%s> {\n", | |
ceabb767 | 1909 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
1910 | if (ret) |
1911 | return ret; | |
ceabb767 | 1912 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
1913 | for (i = 0; i < nr_choices; i++) { |
1914 | const struct lttng_event_field *iter_field; | |
1915 | ||
ceabb767 | 1916 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
1917 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1918 | if (ret) | |
1919 | return ret; | |
1920 | } | |
1921 | ret = print_tabs(session, nesting); | |
1922 | if (ret) | |
1923 | return ret; | |
1924 | ret = lttng_metadata_printf(session, | |
1925 | "}"); | |
1926 | return ret; | |
1927 | } | |
1928 | ||
1929 | /* | |
1930 | * Must be called with sessions_mutex held. | |
1931 | */ | |
1932 | static | |
ceabb767 | 1933 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
1934 | const struct lttng_event_field *field, |
1935 | size_t nesting) | |
1936 | { | |
1937 | int ret; | |
1938 | ||
1939 | ret = _lttng_variant_type_statedump(session, | |
1940 | &field->type, nesting); | |
1941 | if (ret) | |
1942 | return ret; | |
ceabb767 | 1943 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
1944 | } |
1945 | ||
f513b2bf MD |
1946 | /* |
1947 | * Must be called with sessions_mutex held. | |
1948 | */ | |
1949 | static | |
ceabb767 | 1950 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1951 | const struct lttng_event_field *field, |
1952 | size_t nesting) | |
1953 | { | |
1954 | int ret; | |
1955 | const struct lttng_type *elem_type; | |
1956 | ||
ceabb767 MD |
1957 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
1958 | ||
1959 | if (field->type.u.array_nestable.alignment) { | |
1960 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1961 | if (ret) |
1962 | return ret; | |
ceabb767 MD |
1963 | ret = lttng_metadata_printf(session, |
1964 | "struct { } align(%u) _%s_padding;\n", | |
1965 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
1966 | field->name); | |
1967 | if (ret) | |
1968 | return ret; | |
1969 | } | |
1970 | /* | |
1971 | * Nested compound types: Only array of structures and variants are | |
1972 | * currently supported. | |
1973 | */ | |
1974 | elem_type = field->type.u.array_nestable.elem_type; | |
1975 | switch (elem_type->atype) { | |
1976 | case atype_integer: | |
1977 | case atype_struct_nestable: | |
1978 | case atype_variant_nestable: | |
1979 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1980 | if (ret) |
1981 | return ret; | |
1982 | break; | |
ceabb767 | 1983 | |
f513b2bf MD |
1984 | default: |
1985 | return -EINVAL; | |
1986 | } | |
1987 | ret = lttng_metadata_printf(session, | |
1988 | " _%s[%u];\n", | |
1989 | field->name, | |
ceabb767 | 1990 | field->type.u.array_nestable.length); |
f513b2bf MD |
1991 | return ret; |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * Must be called with sessions_mutex held. | |
1996 | */ | |
1997 | static | |
ceabb767 | 1998 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1999 | const struct lttng_event_field *field, |
2000 | size_t nesting) | |
2001 | { | |
2002 | int ret; | |
2003 | const char *length_name; | |
2004 | const struct lttng_type *elem_type; | |
2005 | ||
ceabb767 | 2006 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2007 | |
ceabb767 MD |
2008 | length_name = field->type.u.sequence_nestable.length_name; |
2009 | ||
2010 | if (field->type.u.sequence_nestable.alignment) { | |
2011 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2012 | if (ret) |
2013 | return ret; | |
ceabb767 MD |
2014 | ret = lttng_metadata_printf(session, |
2015 | "struct { } align(%u) _%s_padding;\n", | |
2016 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2017 | field->name); | |
2018 | if (ret) | |
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Nested compound types: Only array of structures and variants are | |
2024 | * currently supported. | |
2025 | */ | |
2026 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2027 | switch (elem_type->atype) { | |
2028 | case atype_integer: | |
2029 | case atype_struct_nestable: | |
2030 | case atype_variant_nestable: | |
2031 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2032 | if (ret) |
2033 | return ret; | |
2034 | break; | |
ceabb767 | 2035 | |
f513b2bf MD |
2036 | default: |
2037 | return -EINVAL; | |
2038 | } | |
2039 | ret = lttng_metadata_printf(session, | |
2040 | " _%s[ _%s ];\n", | |
2041 | field->name, | |
ceabb767 | 2042 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2043 | return ret; |
2044 | } | |
2045 | ||
141ddf28 MD |
2046 | /* |
2047 | * Must be called with sessions_mutex held. | |
2048 | */ | |
2049 | static | |
ceabb767 MD |
2050 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2051 | const struct lttng_type *type, | |
141ddf28 MD |
2052 | size_t nesting) |
2053 | { | |
2054 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2055 | const struct lttng_type *container_type; |
141ddf28 MD |
2056 | int ret; |
2057 | unsigned int i, nr_entries; | |
2058 | ||
ceabb767 MD |
2059 | container_type = type->u.enum_nestable.container_type; |
2060 | if (container_type->atype != atype_integer) { | |
2061 | ret = -EINVAL; | |
2062 | goto end; | |
2063 | } | |
2064 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2065 | nr_entries = enum_desc->nr_entries; |
2066 | ||
2067 | ret = print_tabs(session, nesting); | |
2068 | if (ret) | |
2069 | goto end; | |
ceabb767 MD |
2070 | ret = lttng_metadata_printf(session, "enum : "); |
2071 | if (ret) | |
2072 | goto end; | |
2073 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2074 | if (ret) |
ceabb767 MD |
2075 | goto end; |
2076 | ret = lttng_metadata_printf(session, " {\n"); | |
2077 | if (ret) | |
2078 | goto end; | |
141ddf28 MD |
2079 | /* Dump all entries */ |
2080 | for (i = 0; i < nr_entries; i++) { | |
2081 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2082 | int j, len; | |
2083 | ||
2084 | ret = print_tabs(session, nesting + 1); | |
2085 | if (ret) | |
2086 | goto end; | |
2087 | ret = lttng_metadata_printf(session, | |
2088 | "\""); | |
2089 | if (ret) | |
2090 | goto end; | |
2091 | len = strlen(entry->string); | |
2092 | /* Escape the character '"' */ | |
2093 | for (j = 0; j < len; j++) { | |
2094 | char c = entry->string[j]; | |
2095 | ||
2096 | switch (c) { | |
2097 | case '"': | |
2098 | ret = lttng_metadata_printf(session, | |
2099 | "\\\""); | |
2100 | break; | |
2101 | case '\\': | |
2102 | ret = lttng_metadata_printf(session, | |
2103 | "\\\\"); | |
2104 | break; | |
2105 | default: | |
2106 | ret = lttng_metadata_printf(session, | |
2107 | "%c", c); | |
2108 | break; | |
2109 | } | |
2110 | if (ret) | |
2111 | goto end; | |
2112 | } | |
08ad1061 PP |
2113 | ret = lttng_metadata_printf(session, "\""); |
2114 | if (ret) | |
2115 | goto end; | |
2116 | ||
2117 | if (entry->options.is_auto) { | |
2118 | ret = lttng_metadata_printf(session, ",\n"); | |
2119 | if (ret) | |
2120 | goto end; | |
141ddf28 | 2121 | } else { |
7c559490 MD |
2122 | ret = lttng_metadata_printf(session, |
2123 | " = "); | |
2124 | if (ret) | |
2125 | goto end; | |
2126 | if (entry->start.signedness) | |
141ddf28 | 2127 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2128 | "%lld", (long long) entry->start.value); |
2129 | else | |
2130 | ret = lttng_metadata_printf(session, | |
2131 | "%llu", entry->start.value); | |
2132 | if (ret) | |
2133 | goto end; | |
2134 | if (entry->start.signedness == entry->end.signedness && | |
2135 | entry->start.value | |
2136 | == entry->end.value) { | |
141ddf28 | 2137 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2138 | ",\n"); |
2139 | } else { | |
2140 | if (entry->end.signedness) { | |
2141 | ret = lttng_metadata_printf(session, | |
2142 | " ... %lld,\n", | |
2143 | (long long) entry->end.value); | |
2144 | } else { | |
2145 | ret = lttng_metadata_printf(session, | |
2146 | " ... %llu,\n", | |
2147 | entry->end.value); | |
2148 | } | |
141ddf28 | 2149 | } |
7c559490 MD |
2150 | if (ret) |
2151 | goto end; | |
141ddf28 | 2152 | } |
141ddf28 MD |
2153 | } |
2154 | ret = print_tabs(session, nesting); | |
2155 | if (ret) | |
2156 | goto end; | |
ceabb767 | 2157 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2158 | end: |
2159 | return ret; | |
2160 | } | |
2161 | ||
d83004aa JD |
2162 | /* |
2163 | * Must be called with sessions_mutex held. | |
2164 | */ | |
c099397a | 2165 | static |
ceabb767 MD |
2166 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2167 | const struct lttng_event_field *field, | |
2168 | size_t nesting) | |
2169 | { | |
2170 | int ret; | |
2171 | ||
2172 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2173 | if (ret) | |
2174 | return ret; | |
2175 | return lttng_field_name_statedump(session, field, nesting); | |
2176 | } | |
2177 | ||
2178 | static | |
2179 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2180 | const struct lttng_event_field *field, | |
2181 | size_t nesting) | |
2182 | { | |
2183 | int ret; | |
2184 | ||
2185 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2186 | if (ret) | |
2187 | return ret; | |
2188 | return lttng_field_name_statedump(session, field, nesting); | |
2189 | } | |
2190 | ||
2191 | static | |
2192 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2193 | const struct lttng_type *type, | |
2194 | size_t nesting) | |
2195 | { | |
2196 | int ret; | |
2197 | ||
2198 | WARN_ON_ONCE(type->atype != atype_string); | |
2199 | /* Default encoding is UTF8 */ | |
2200 | ret = print_tabs(session, nesting); | |
2201 | if (ret) | |
2202 | return ret; | |
2203 | ret = lttng_metadata_printf(session, | |
2204 | "string%s", | |
2205 | type->u.string.encoding == lttng_encode_ASCII ? | |
2206 | " { encoding = ASCII; }" : ""); | |
2207 | return ret; | |
2208 | } | |
2209 | ||
2210 | static | |
2211 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2212 | const struct lttng_event_field *field, |
2213 | size_t nesting) | |
ceabb767 MD |
2214 | { |
2215 | int ret; | |
2216 | ||
2217 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2218 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2219 | if (ret) | |
2220 | return ret; | |
2221 | return lttng_field_name_statedump(session, field, nesting); | |
2222 | } | |
2223 | ||
2224 | /* | |
2225 | * Must be called with sessions_mutex held. | |
2226 | */ | |
2227 | static | |
2228 | int _lttng_type_statedump(struct lttng_session *session, | |
2229 | const struct lttng_type *type, | |
2230 | size_t nesting) | |
c099397a | 2231 | { |
c099397a | 2232 | int ret = 0; |
c099397a | 2233 | |
ceabb767 | 2234 | switch (type->atype) { |
8070f5c0 | 2235 | case atype_integer: |
ceabb767 | 2236 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2237 | break; |
ceabb767 MD |
2238 | case atype_enum_nestable: |
2239 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2240 | break; |
ceabb767 MD |
2241 | case atype_string: |
2242 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2243 | break; | |
2244 | case atype_struct_nestable: | |
2245 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2246 | break; |
ceabb767 MD |
2247 | case atype_variant_nestable: |
2248 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2249 | break; | |
2250 | ||
2251 | /* Nested arrays and sequences are not supported yet. */ | |
2252 | case atype_array_nestable: | |
2253 | case atype_sequence_nestable: | |
2254 | default: | |
2255 | WARN_ON_ONCE(1); | |
2256 | return -EINVAL; | |
8070f5c0 | 2257 | } |
ceabb767 MD |
2258 | return ret; |
2259 | } | |
8070f5c0 | 2260 | |
ceabb767 MD |
2261 | /* |
2262 | * Must be called with sessions_mutex held. | |
2263 | */ | |
2264 | static | |
2265 | int _lttng_field_statedump(struct lttng_session *session, | |
2266 | const struct lttng_event_field *field, | |
2267 | size_t nesting) | |
2268 | { | |
2269 | int ret = 0; | |
27d2368e | 2270 | |
ceabb767 MD |
2271 | switch (field->type.atype) { |
2272 | case atype_integer: | |
2273 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2274 | break; | |
2275 | case atype_enum_nestable: | |
2276 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2277 | break; |
8070f5c0 | 2278 | case atype_string: |
ceabb767 | 2279 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2280 | break; |
ceabb767 MD |
2281 | case atype_struct_nestable: |
2282 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2283 | break; |
ceabb767 MD |
2284 | case atype_array_nestable: |
2285 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2286 | break; |
ceabb767 MD |
2287 | case atype_sequence_nestable: |
2288 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2289 | break; |
ceabb767 MD |
2290 | case atype_variant_nestable: |
2291 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2292 | break; |
f513b2bf | 2293 | |
8070f5c0 MD |
2294 | default: |
2295 | WARN_ON_ONCE(1); | |
2296 | return -EINVAL; | |
2297 | } | |
2298 | return ret; | |
2299 | } | |
2300 | ||
2301 | static | |
a90917c3 | 2302 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2303 | struct lttng_ctx *ctx) |
2304 | { | |
2305 | int ret = 0; | |
2306 | int i; | |
2307 | ||
2308 | if (!ctx) | |
2309 | return 0; | |
2310 | for (i = 0; i < ctx->nr_fields; i++) { | |
2311 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2312 | ||
f513b2bf | 2313 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2314 | if (ret) |
2315 | return ret; | |
2316 | } | |
2317 | return ret; | |
2318 | } | |
2319 | ||
2320 | static | |
a90917c3 MD |
2321 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2322 | struct lttng_event *event) | |
8070f5c0 MD |
2323 | { |
2324 | const struct lttng_event_desc *desc = event->desc; | |
2325 | int ret = 0; | |
2326 | int i; | |
2327 | ||
2328 | for (i = 0; i < desc->nr_fields; i++) { | |
2329 | const struct lttng_event_field *field = &desc->fields[i]; | |
2330 | ||
f513b2bf | 2331 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2332 | if (ret) |
2333 | return ret; | |
c099397a MD |
2334 | } |
2335 | return ret; | |
2336 | } | |
2337 | ||
d83004aa JD |
2338 | /* |
2339 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2340 | * The entire event metadata is printed as a single atomic metadata |
2341 | * transaction. | |
d83004aa | 2342 | */ |
c099397a | 2343 | static |
a90917c3 MD |
2344 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2345 | struct lttng_channel *chan, | |
2346 | struct lttng_event *event) | |
c099397a MD |
2347 | { |
2348 | int ret = 0; | |
2349 | ||
a8f2d0c7 | 2350 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2351 | return 0; |
d83004aa | 2352 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2353 | return 0; |
2354 | ||
8b97fd42 MD |
2355 | lttng_metadata_begin(session); |
2356 | ||
c099397a MD |
2357 | ret = lttng_metadata_printf(session, |
2358 | "event {\n" | |
ae734547 | 2359 | " name = \"%s\";\n" |
c099397a | 2360 | " id = %u;\n" |
b9074a1b | 2361 | " stream_id = %u;\n", |
c099397a MD |
2362 | event->desc->name, |
2363 | event->id, | |
2364 | event->chan->id); | |
2365 | if (ret) | |
2366 | goto end; | |
2367 | ||
b9074a1b MD |
2368 | if (event->ctx) { |
2369 | ret = lttng_metadata_printf(session, | |
2370 | " context := struct {\n"); | |
2371 | if (ret) | |
2372 | goto end; | |
2373 | } | |
a90917c3 | 2374 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2375 | if (ret) |
2376 | goto end; | |
b9074a1b MD |
2377 | if (event->ctx) { |
2378 | ret = lttng_metadata_printf(session, | |
2379 | " };\n"); | |
2380 | if (ret) | |
2381 | goto end; | |
2382 | } | |
8070f5c0 MD |
2383 | |
2384 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2385 | " fields := struct {\n" |
2386 | ); | |
2387 | if (ret) | |
2388 | goto end; | |
2389 | ||
a90917c3 | 2390 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2391 | if (ret) |
2392 | goto end; | |
2393 | ||
2394 | /* | |
2395 | * LTTng space reservation can only reserve multiples of the | |
2396 | * byte size. | |
2397 | */ | |
2398 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2399 | " };\n" |
2400 | "};\n\n"); | |
c099397a MD |
2401 | if (ret) |
2402 | goto end; | |
2403 | ||
c099397a MD |
2404 | event->metadata_dumped = 1; |
2405 | end: | |
8b97fd42 | 2406 | lttng_metadata_end(session); |
c099397a MD |
2407 | return ret; |
2408 | ||
2409 | } | |
2410 | ||
d83004aa JD |
2411 | /* |
2412 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2413 | * The entire channel metadata is printed as a single atomic metadata |
2414 | * transaction. | |
d83004aa | 2415 | */ |
c099397a | 2416 | static |
a90917c3 MD |
2417 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2418 | struct lttng_channel *chan) | |
c099397a MD |
2419 | { |
2420 | int ret = 0; | |
2421 | ||
a8f2d0c7 | 2422 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2423 | return 0; |
d83004aa JD |
2424 | |
2425 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2426 | return 0; |
2427 | ||
8b97fd42 MD |
2428 | lttng_metadata_begin(session); |
2429 | ||
c099397a MD |
2430 | WARN_ON_ONCE(!chan->header_type); |
2431 | ret = lttng_metadata_printf(session, | |
2432 | "stream {\n" | |
2433 | " id = %u;\n" | |
9115fbdc | 2434 | " event.header := %s;\n" |
b9074a1b | 2435 | " packet.context := struct packet_context;\n", |
c099397a MD |
2436 | chan->id, |
2437 | chan->header_type == 1 ? "struct event_header_compact" : | |
2438 | "struct event_header_large"); | |
2439 | if (ret) | |
2440 | goto end; | |
2441 | ||
b9074a1b MD |
2442 | if (chan->ctx) { |
2443 | ret = lttng_metadata_printf(session, | |
2444 | " event.context := struct {\n"); | |
2445 | if (ret) | |
2446 | goto end; | |
2447 | } | |
a90917c3 | 2448 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2449 | if (ret) |
2450 | goto end; | |
b9074a1b MD |
2451 | if (chan->ctx) { |
2452 | ret = lttng_metadata_printf(session, | |
2453 | " };\n"); | |
2454 | if (ret) | |
2455 | goto end; | |
2456 | } | |
8070f5c0 MD |
2457 | |
2458 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2459 | "};\n\n"); |
8070f5c0 | 2460 | |
c099397a MD |
2461 | chan->metadata_dumped = 1; |
2462 | end: | |
8b97fd42 | 2463 | lttng_metadata_end(session); |
c099397a MD |
2464 | return ret; |
2465 | } | |
2466 | ||
d83004aa JD |
2467 | /* |
2468 | * Must be called with sessions_mutex held. | |
2469 | */ | |
9115fbdc | 2470 | static |
a90917c3 | 2471 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2472 | { |
2473 | return lttng_metadata_printf(session, | |
2474 | "struct packet_context {\n" | |
a3ccff4f MD |
2475 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2476 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2477 | " uint64_t content_size;\n" |
2478 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2479 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2480 | " unsigned long events_discarded;\n" |
9115fbdc | 2481 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2482 | "};\n\n" |
9115fbdc MD |
2483 | ); |
2484 | } | |
2485 | ||
2486 | /* | |
2487 | * Compact header: | |
2488 | * id: range: 0 - 30. | |
2489 | * id 31 is reserved to indicate an extended header. | |
2490 | * | |
2491 | * Large header: | |
2492 | * id: range: 0 - 65534. | |
2493 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2494 | * |
2495 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2496 | */ |
2497 | static | |
a90917c3 | 2498 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2499 | { |
2500 | return lttng_metadata_printf(session, | |
2501 | "struct event_header_compact {\n" | |
2502 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2503 | " variant <id> {\n" | |
2504 | " struct {\n" | |
a3ccff4f | 2505 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2506 | " } compact;\n" |
2507 | " struct {\n" | |
2508 | " uint32_t id;\n" | |
a3ccff4f | 2509 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2510 | " } extended;\n" |
2511 | " } v;\n" | |
2512 | "} align(%u);\n" | |
2513 | "\n" | |
2514 | "struct event_header_large {\n" | |
2515 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2516 | " variant <id> {\n" | |
2517 | " struct {\n" | |
a3ccff4f | 2518 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2519 | " } compact;\n" |
2520 | " struct {\n" | |
2521 | " uint32_t id;\n" | |
a3ccff4f | 2522 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2523 | " } extended;\n" |
2524 | " } v;\n" | |
2525 | "} align(%u);\n\n", | |
a90917c3 MD |
2526 | lttng_alignof(uint32_t) * CHAR_BIT, |
2527 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2528 | ); |
2529 | } | |
2530 | ||
a3ccff4f MD |
2531 | /* |
2532 | * Approximation of NTP time of day to clock monotonic correlation, | |
2533 | * taken at start of trace. | |
2534 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2535 | * in future versions. | |
5283350b MD |
2536 | * This function may return a negative offset. It may happen if the |
2537 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2538 | * |
2539 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2540 | * y2038 compliant. | |
a3ccff4f MD |
2541 | */ |
2542 | static | |
8967b2a3 | 2543 | int64_t measure_clock_offset(void) |
a3ccff4f | 2544 | { |
dcb93448 | 2545 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2546 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2547 | int64_t offset; |
a3ccff4f | 2548 | unsigned long flags; |
3636085f MJ |
2549 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2550 | struct timespec64 rts = { 0, 0 }; | |
2551 | #else | |
2552 | struct timespec rts = { 0, 0 }; | |
2553 | #endif | |
a3ccff4f MD |
2554 | |
2555 | /* Disable interrupts to increase correlation precision. */ | |
2556 | local_irq_save(flags); | |
2557 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
2558 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2559 | ktime_get_real_ts64(&rts); | |
2560 | #else | |
216b6baa | 2561 | getnstimeofday(&rts); |
3636085f | 2562 | #endif |
a3ccff4f MD |
2563 | monotonic[1] = trace_clock_read64(); |
2564 | local_irq_restore(flags); | |
2565 | ||
dcb93448 | 2566 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2567 | realtime = (uint64_t) rts.tv_sec * tcf; |
2568 | if (tcf == NSEC_PER_SEC) { | |
2569 | realtime += rts.tv_nsec; | |
2570 | } else { | |
2571 | uint64_t n = rts.tv_nsec * tcf; | |
2572 | ||
2573 | do_div(n, NSEC_PER_SEC); | |
2574 | realtime += n; | |
2575 | } | |
dcb93448 | 2576 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2577 | return offset; |
2578 | } | |
2579 | ||
3eb95be4 JR |
2580 | static |
2581 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2582 | { | |
0f3eaad4 | 2583 | int ret = 0; |
3eb95be4 JR |
2584 | size_t i; |
2585 | char cur; | |
2586 | ||
2587 | i = 0; | |
2588 | cur = string[i]; | |
2589 | while (cur != '\0') { | |
2590 | switch (cur) { | |
2591 | case '\n': | |
2592 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2593 | break; | |
2594 | case '\\': | |
2595 | case '"': | |
2596 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2597 | if (ret) | |
2598 | goto error; | |
2599 | /* We still print the current char */ | |
2600 | /* Fallthrough */ | |
2601 | default: | |
2602 | ret = lttng_metadata_printf(session, "%c", cur); | |
2603 | break; | |
2604 | } | |
2605 | ||
2606 | if (ret) | |
2607 | goto error; | |
2608 | ||
2609 | cur = string[++i]; | |
2610 | } | |
2611 | error: | |
2612 | return ret; | |
2613 | } | |
2614 | ||
2615 | static | |
1c88f269 JR |
2616 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2617 | const char *field_value) | |
3eb95be4 JR |
2618 | { |
2619 | int ret; | |
2620 | ||
1c88f269 | 2621 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2622 | if (ret) |
2623 | goto error; | |
2624 | ||
1c88f269 | 2625 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2626 | if (ret) |
2627 | goto error; | |
2628 | ||
2629 | ret = lttng_metadata_printf(session, "\";\n"); | |
2630 | ||
2631 | error: | |
2632 | return ret; | |
2633 | } | |
2634 | ||
c099397a MD |
2635 | /* |
2636 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2637 | * Must be called with sessions_mutex held. |
c099397a MD |
2638 | */ |
2639 | static | |
a90917c3 | 2640 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2641 | { |
30bdb6e4 | 2642 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2643 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2644 | const char *product_uuid; |
a90917c3 MD |
2645 | struct lttng_channel *chan; |
2646 | struct lttng_event *event; | |
c099397a MD |
2647 | int ret = 0; |
2648 | ||
a8f2d0c7 | 2649 | if (!READ_ONCE(session->active)) |
c099397a | 2650 | return 0; |
8b97fd42 MD |
2651 | |
2652 | lttng_metadata_begin(session); | |
2653 | ||
c099397a MD |
2654 | if (session->metadata_dumped) |
2655 | goto skip_session; | |
c099397a | 2656 | |
d793d5e1 | 2657 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2658 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2659 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2660 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2661 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2662 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2663 | |
2664 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2665 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2666 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2667 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2668 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2669 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2670 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2671 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2672 | "\n" |
2673 | "trace {\n" | |
2674 | " major = %u;\n" | |
2675 | " minor = %u;\n" | |
30bdb6e4 | 2676 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2677 | " byte_order = %s;\n" |
2678 | " packet.header := struct {\n" | |
2679 | " uint32_t magic;\n" | |
1ec3f75a | 2680 | " uint8_t uuid[16];\n" |
d793d5e1 | 2681 | " uint32_t stream_id;\n" |
5594698f | 2682 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2683 | " };\n" |
d793d5e1 | 2684 | "};\n\n", |
a90917c3 MD |
2685 | lttng_alignof(uint8_t) * CHAR_BIT, |
2686 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2687 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2688 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2689 | sizeof(unsigned long) * CHAR_BIT, |
2690 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2691 | CTF_SPEC_MAJOR, |
2692 | CTF_SPEC_MINOR, | |
d793d5e1 | 2693 | uuid_s, |
5214fa50 | 2694 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2695 | "be" |
2696 | #else | |
2697 | "le" | |
2698 | #endif | |
2699 | ); | |
2700 | if (ret) | |
2701 | goto end; | |
2702 | ||
99dc9597 MD |
2703 | ret = lttng_metadata_printf(session, |
2704 | "env {\n" | |
a6058143 | 2705 | " hostname = \"%s\";\n" |
c6c9e10f | 2706 | " domain = \"kernel\";\n" |
99dc9597 | 2707 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2708 | " kernel_release = \"%s\";\n" |
2709 | " kernel_version = \"%s\";\n" | |
2710 | " tracer_name = \"lttng-modules\";\n" | |
2711 | " tracer_major = %d;\n" | |
2712 | " tracer_minor = %d;\n" | |
2713 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2714 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2715 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2716 | utsname()->sysname, |
2717 | utsname()->release, | |
c6c9e10f MD |
2718 | utsname()->version, |
2719 | LTTNG_MODULES_MAJOR_VERSION, | |
2720 | LTTNG_MODULES_MINOR_VERSION, | |
2721 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2722 | ); |
2723 | if (ret) | |
2724 | goto end; | |
2725 | ||
1c88f269 JR |
2726 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2727 | if (ret) | |
2728 | goto end; | |
2729 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2730 | session->creation_time); | |
3eb95be4 JR |
2731 | if (ret) |
2732 | goto end; | |
2733 | ||
c88f762e GB |
2734 | /* Add the product UUID to the 'env' section */ |
2735 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2736 | if (product_uuid) { | |
2737 | ret = lttng_metadata_printf(session, | |
2738 | " product_uuid = \"%s\";\n", | |
2739 | product_uuid | |
2740 | ); | |
2741 | if (ret) | |
2742 | goto end; | |
2743 | } | |
2744 | ||
2745 | /* Close the 'env' section */ | |
3eb95be4 JR |
2746 | ret = lttng_metadata_printf(session, "};\n\n"); |
2747 | if (ret) | |
2748 | goto end; | |
2749 | ||
a3ccff4f MD |
2750 | ret = lttng_metadata_printf(session, |
2751 | "clock {\n" | |
2754583e MD |
2752 | " name = \"%s\";\n", |
2753 | trace_clock_name() | |
a82c63f1 MD |
2754 | ); |
2755 | if (ret) | |
2756 | goto end; | |
2757 | ||
2758 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2759 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2760 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2761 | clock_uuid_s |
2762 | ); | |
2763 | if (ret) | |
2764 | goto end; | |
2765 | } | |
2766 | ||
2767 | ret = lttng_metadata_printf(session, | |
2754583e | 2768 | " description = \"%s\";\n" |
a3ccff4f MD |
2769 | " freq = %llu; /* Frequency, in Hz */\n" |
2770 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2771 | " offset = %lld;\n" |
a3ccff4f | 2772 | "};\n\n", |
2754583e | 2773 | trace_clock_description(), |
a3ccff4f | 2774 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2775 | (long long) measure_clock_offset() |
a3ccff4f MD |
2776 | ); |
2777 | if (ret) | |
2778 | goto end; | |
2779 | ||
2780 | ret = lttng_metadata_printf(session, | |
2781 | "typealias integer {\n" | |
2782 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2783 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2784 | "} := uint27_clock_monotonic_t;\n" |
2785 | "\n" | |
2786 | "typealias integer {\n" | |
2787 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2788 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2789 | "} := uint32_clock_monotonic_t;\n" |
2790 | "\n" | |
2791 | "typealias integer {\n" | |
2792 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2793 | " map = clock.%s.value;\n" |
a3ccff4f | 2794 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2795 | trace_clock_name(), |
a3ccff4f | 2796 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2797 | trace_clock_name(), |
2798 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2799 | trace_clock_name() | |
a3ccff4f MD |
2800 | ); |
2801 | if (ret) | |
2802 | goto end; | |
2803 | ||
a90917c3 | 2804 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2805 | if (ret) |
2806 | goto end; | |
2807 | ||
a90917c3 | 2808 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2809 | if (ret) |
2810 | goto end; | |
2811 | ||
c099397a MD |
2812 | skip_session: |
2813 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2814 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2815 | if (ret) |
2816 | goto end; | |
2817 | } | |
2818 | ||
2819 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2820 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2821 | if (ret) |
2822 | goto end; | |
2823 | } | |
2824 | session->metadata_dumped = 1; | |
2825 | end: | |
8b97fd42 | 2826 | lttng_metadata_end(session); |
c099397a MD |
2827 | return ret; |
2828 | } | |
2829 | ||
c0e31d2e | 2830 | /** |
a90917c3 | 2831 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2832 | * @transport: transport structure |
2833 | * | |
2834 | * Registers a transport which can be used as output to extract the data out of | |
2835 | * LTTng. The module calling this registration function must ensure that no | |
2836 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 2837 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 2838 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 2839 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
2840 | * after its registration must it synchronize the TLBs. |
2841 | */ | |
a90917c3 | 2842 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2843 | { |
2844 | /* | |
2845 | * Make sure no page fault can be triggered by the module about to be | |
2846 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 2847 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 2848 | */ |
263b6c88 | 2849 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
2850 | |
2851 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2852 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2853 | mutex_unlock(&sessions_mutex); |
2854 | } | |
a90917c3 | 2855 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2856 | |
2857 | /** | |
a90917c3 | 2858 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2859 | * @transport: transport structure |
2860 | */ | |
a90917c3 | 2861 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2862 | { |
2863 | mutex_lock(&sessions_mutex); | |
2864 | list_del(&transport->node); | |
2865 | mutex_unlock(&sessions_mutex); | |
2866 | } | |
a90917c3 | 2867 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2868 | |
894ce5dc | 2869 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2870 | |
2871 | enum cpuhp_state lttng_hp_prepare; | |
2872 | enum cpuhp_state lttng_hp_online; | |
2873 | ||
2874 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2875 | { | |
2876 | struct lttng_cpuhp_node *lttng_node; | |
2877 | ||
2878 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2879 | switch (lttng_node->component) { | |
2880 | case LTTNG_RING_BUFFER_FRONTEND: | |
2881 | return 0; | |
2882 | case LTTNG_RING_BUFFER_BACKEND: | |
2883 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2884 | case LTTNG_RING_BUFFER_ITER: | |
2885 | return 0; | |
2886 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2887 | return 0; | |
2888 | default: | |
2889 | return -EINVAL; | |
2890 | } | |
2891 | } | |
2892 | ||
2893 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2894 | { | |
2895 | struct lttng_cpuhp_node *lttng_node; | |
2896 | ||
2897 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2898 | switch (lttng_node->component) { | |
2899 | case LTTNG_RING_BUFFER_FRONTEND: | |
2900 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2901 | case LTTNG_RING_BUFFER_BACKEND: | |
2902 | return 0; | |
2903 | case LTTNG_RING_BUFFER_ITER: | |
2904 | return 0; | |
2905 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2906 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2907 | default: | |
2908 | return -EINVAL; | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2913 | { | |
2914 | struct lttng_cpuhp_node *lttng_node; | |
2915 | ||
2916 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2917 | switch (lttng_node->component) { | |
2918 | case LTTNG_RING_BUFFER_FRONTEND: | |
2919 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2920 | case LTTNG_RING_BUFFER_BACKEND: | |
2921 | return 0; | |
2922 | case LTTNG_RING_BUFFER_ITER: | |
2923 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2924 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2925 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2926 | default: | |
2927 | return -EINVAL; | |
2928 | } | |
2929 | } | |
2930 | ||
2931 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2932 | { | |
2933 | struct lttng_cpuhp_node *lttng_node; | |
2934 | ||
2935 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2936 | switch (lttng_node->component) { | |
2937 | case LTTNG_RING_BUFFER_FRONTEND: | |
2938 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2939 | case LTTNG_RING_BUFFER_BACKEND: | |
2940 | return 0; | |
2941 | case LTTNG_RING_BUFFER_ITER: | |
2942 | return 0; | |
2943 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2944 | return 0; | |
2945 | default: | |
2946 | return -EINVAL; | |
2947 | } | |
2948 | } | |
2949 | ||
2950 | static int __init lttng_init_cpu_hotplug(void) | |
2951 | { | |
2952 | int ret; | |
2953 | ||
2954 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2955 | lttng_hotplug_prepare, | |
2956 | lttng_hotplug_dead); | |
2957 | if (ret < 0) { | |
2958 | return ret; | |
2959 | } | |
2960 | lttng_hp_prepare = ret; | |
2961 | lttng_rb_set_hp_prepare(ret); | |
2962 | ||
2963 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2964 | lttng_hotplug_online, | |
2965 | lttng_hotplug_offline); | |
2966 | if (ret < 0) { | |
2967 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2968 | lttng_hp_prepare = 0; | |
2969 | return ret; | |
2970 | } | |
2971 | lttng_hp_online = ret; | |
2972 | lttng_rb_set_hp_online(ret); | |
2973 | ||
2974 | return 0; | |
2975 | } | |
2976 | ||
2977 | static void __exit lttng_exit_cpu_hotplug(void) | |
2978 | { | |
2979 | lttng_rb_set_hp_online(0); | |
2980 | cpuhp_remove_multi_state(lttng_hp_online); | |
2981 | lttng_rb_set_hp_prepare(0); | |
2982 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2983 | } | |
2984 | ||
1ee63d8d | 2985 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2986 | static int lttng_init_cpu_hotplug(void) |
2987 | { | |
2988 | return 0; | |
2989 | } | |
2990 | static void lttng_exit_cpu_hotplug(void) | |
2991 | { | |
2992 | } | |
1ee63d8d | 2993 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2994 | |
2995 | ||
a90917c3 | 2996 | static int __init lttng_events_init(void) |
4e3c1b9b | 2997 | { |
1c25284c MD |
2998 | int ret; |
2999 | ||
453b2495 JD |
3000 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3001 | if (ret) | |
3002 | return ret; | |
389d7070 | 3003 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3004 | if (ret) |
3005 | return ret; | |
3006 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3007 | if (ret) |
3008 | return ret; | |
3009 | ret = lttng_probes_init(); | |
389d7070 MD |
3010 | if (ret) |
3011 | return ret; | |
07dfc1d0 | 3012 | ret = lttng_context_init(); |
20591cf7 MD |
3013 | if (ret) |
3014 | return ret; | |
07dfc1d0 MD |
3015 | ret = lttng_tracepoint_init(); |
3016 | if (ret) | |
3017 | goto error_tp; | |
a90917c3 | 3018 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3019 | if (!event_cache) { |
3020 | ret = -ENOMEM; | |
3021 | goto error_kmem; | |
3022 | } | |
80996790 | 3023 | ret = lttng_abi_init(); |
02119ee5 MD |
3024 | if (ret) |
3025 | goto error_abi; | |
0c956676 MD |
3026 | ret = lttng_logger_init(); |
3027 | if (ret) | |
3028 | goto error_logger; | |
1e367326 MD |
3029 | ret = lttng_init_cpu_hotplug(); |
3030 | if (ret) | |
3031 | goto error_hotplug; | |
101215b7 | 3032 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3033 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3034 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3035 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3036 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3037 | LTTNG_VERSION_NAME, |
3038 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3039 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3040 | #else | |
3041 | "", | |
3042 | #endif | |
3043 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3044 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3045 | #else | |
3046 | ""); | |
3047 | #endif | |
4e3c1b9b | 3048 | return 0; |
0c956676 | 3049 | |
1e367326 MD |
3050 | error_hotplug: |
3051 | lttng_logger_exit(); | |
0c956676 MD |
3052 | error_logger: |
3053 | lttng_abi_exit(); | |
02119ee5 | 3054 | error_abi: |
1c25284c | 3055 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3056 | error_kmem: |
3057 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3058 | error_tp: |
3059 | lttng_context_exit(); | |
101215b7 | 3060 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3061 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3062 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3063 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3064 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3065 | LTTNG_VERSION_NAME, |
3066 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3067 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3068 | #else | |
3069 | "", | |
3070 | #endif | |
3071 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3072 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3073 | #else | |
3074 | ""); | |
3075 | #endif | |
1c25284c | 3076 | return ret; |
4e3c1b9b MD |
3077 | } |
3078 | ||
a90917c3 | 3079 | module_init(lttng_events_init); |
11b5a3c2 | 3080 | |
a90917c3 | 3081 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3082 | { |
a90917c3 | 3083 | struct lttng_session *session, *tmpsession; |
92e94819 | 3084 | |
1e367326 | 3085 | lttng_exit_cpu_hotplug(); |
0c956676 | 3086 | lttng_logger_exit(); |
80996790 | 3087 | lttng_abi_exit(); |
92e94819 | 3088 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3089 | lttng_session_destroy(session); |
11b5a3c2 | 3090 | kmem_cache_destroy(event_cache); |
20591cf7 | 3091 | lttng_tracepoint_exit(); |
07dfc1d0 | 3092 | lttng_context_exit(); |
101215b7 | 3093 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3094 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3095 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3096 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3097 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3098 | LTTNG_VERSION_NAME, |
3099 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3100 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3101 | #else | |
3102 | "", | |
3103 | #endif | |
3104 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3105 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3106 | #else | |
3107 | ""); | |
3108 | #endif | |
4e3c1b9b | 3109 | } |
92e94819 | 3110 | |
a90917c3 | 3111 | module_exit(lttng_events_exit); |
11b5a3c2 | 3112 | |
7ca11e77 | 3113 | #include <generated/patches.h> |
101215b7 MJ |
3114 | #ifdef LTTNG_EXTRA_VERSION_GIT |
3115 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3116 | #endif | |
3117 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3118 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3119 | #endif | |
92e94819 MD |
3120 | MODULE_LICENSE("GPL and additional rights"); |
3121 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3122 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3123 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3124 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3125 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3126 | LTTNG_MODULES_EXTRAVERSION); |