Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
3c997079 | 27 | #include <linux/jhash.h> |
8c6e7f13 | 28 | #include <linux/uaccess.h> |
a606b6e8 | 29 | #include <linux/vmalloc.h> |
c88f762e | 30 | #include <linux/dmi.h> |
3c997079 | 31 | |
8b7bb83e | 32 | #include <wrapper/uuid.h> |
ea53823c | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
241ae9a8 MD |
38 | #include <lttng-kernel-version.h> |
39 | #include <lttng-events.h> | |
40 | #include <lttng-tracer.h> | |
41 | #include <lttng-abi-old.h> | |
5214fa50 | 42 | #include <lttng-endian.h> |
4993071a | 43 | #include <lttng-string-utils.h> |
1d00109f | 44 | #include <wrapper/compiler_attributes.h> |
64af2437 MD |
45 | #include <wrapper/ringbuffer/backend.h> |
46 | #include <wrapper/ringbuffer/frontend.h> | |
72dc372e | 47 | #include <wrapper/time.h> |
4e3c1b9b | 48 | |
74b3b9d3 MJ |
49 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) |
50 | #include <linux/stdarg.h> | |
51 | #else | |
52 | #include <stdarg.h> | |
53 | #endif | |
54 | ||
d83004aa JD |
55 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
56 | ||
4e3c1b9b | 57 | static LIST_HEAD(sessions); |
a90917c3 | 58 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
59 | /* |
60 | * Protect the sessions and metadata caches. | |
61 | */ | |
4e3c1b9b MD |
62 | static DEFINE_MUTEX(sessions_mutex); |
63 | static struct kmem_cache *event_cache; | |
64 | ||
3c997079 MD |
65 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
66 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
67 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
68 | ||
a90917c3 MD |
69 | static void _lttng_event_destroy(struct lttng_event *event); |
70 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
71 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 72 | static |
a90917c3 MD |
73 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
74 | struct lttng_channel *chan, | |
75 | struct lttng_event *event); | |
c099397a | 76 | static |
a90917c3 | 77 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
78 | static |
79 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
80 | static |
81 | int _lttng_field_statedump(struct lttng_session *session, | |
82 | const struct lttng_event_field *field, | |
83 | size_t nesting); | |
c099397a | 84 | |
c099397a | 85 | void synchronize_trace(void) |
abcca994 | 86 | { |
78f56ae3 MJ |
87 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
88 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
89 | synchronize_rcu(); |
90 | #else | |
abcca994 | 91 | synchronize_sched(); |
92da05ce MJ |
92 | #endif |
93 | ||
2d042821 | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
95 | #ifdef CONFIG_PREEMPT_RT_FULL |
96 | synchronize_rcu(); | |
97 | #endif | |
2d042821 | 98 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
99 | #ifdef CONFIG_PREEMPT_RT |
100 | synchronize_rcu(); | |
101 | #endif | |
2d042821 | 102 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
103 | } |
104 | ||
3c997079 MD |
105 | void lttng_lock_sessions(void) |
106 | { | |
107 | mutex_lock(&sessions_mutex); | |
108 | } | |
109 | ||
110 | void lttng_unlock_sessions(void) | |
111 | { | |
112 | mutex_unlock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Called with sessions lock held. | |
117 | */ | |
118 | int lttng_session_active(void) | |
119 | { | |
120 | struct lttng_session *iter; | |
121 | ||
122 | list_for_each_entry(iter, &sessions, list) { | |
123 | if (iter->active) | |
124 | return 1; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
a90917c3 | 129 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 130 | { |
a90917c3 | 131 | struct lttng_session *session; |
d83004aa | 132 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 133 | int i; |
4e3c1b9b MD |
134 | |
135 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 136 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 137 | if (!session) |
d83004aa | 138 | goto err; |
4e3c1b9b | 139 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 140 | INIT_LIST_HEAD(&session->events); |
8b7bb83e | 141 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
142 | |
143 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
144 | GFP_KERNEL); | |
145 | if (!metadata_cache) | |
146 | goto err_free_session; | |
0ca42eb7 | 147 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
148 | if (!metadata_cache->data) |
149 | goto err_free_cache; | |
150 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
151 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 152 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
153 | session->metadata_cache = metadata_cache; |
154 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
155 | memcpy(&metadata_cache->uuid, &session->uuid, |
156 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
157 | INIT_LIST_HEAD(&session->enablers_head); |
158 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
159 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 160 | list_add(&session->list, &sessions); |
d1f652f8 MD |
161 | session->pid_tracker.session = session; |
162 | session->pid_tracker.tracker_type = TRACKER_PID; | |
163 | session->vpid_tracker.session = session; | |
164 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
165 | session->uid_tracker.session = session; | |
166 | session->uid_tracker.tracker_type = TRACKER_UID; | |
167 | session->vuid_tracker.session = session; | |
168 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
169 | session->gid_tracker.session = session; | |
170 | session->gid_tracker.tracker_type = TRACKER_GID; | |
171 | session->vgid_tracker.session = session; | |
172 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
173 | mutex_unlock(&sessions_mutex); |
174 | return session; | |
d83004aa JD |
175 | |
176 | err_free_cache: | |
177 | kfree(metadata_cache); | |
178 | err_free_session: | |
48f5e0b5 | 179 | lttng_kvfree(session); |
d83004aa JD |
180 | err: |
181 | mutex_unlock(&sessions_mutex); | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | void metadata_cache_destroy(struct kref *kref) | |
186 | { | |
187 | struct lttng_metadata_cache *cache = | |
188 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 189 | vfree(cache->data); |
d83004aa | 190 | kfree(cache); |
4e3c1b9b MD |
191 | } |
192 | ||
a90917c3 | 193 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 194 | { |
a90917c3 MD |
195 | struct lttng_channel *chan, *tmpchan; |
196 | struct lttng_event *event, *tmpevent; | |
d83004aa | 197 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 198 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 199 | int ret; |
4e3c1b9b MD |
200 | |
201 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 202 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
203 | list_for_each_entry(chan, &session->chan, list) { |
204 | ret = lttng_syscalls_unregister(chan); | |
205 | WARN_ON(ret); | |
206 | } | |
dda6a249 | 207 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 208 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
209 | WARN_ON(ret); |
210 | } | |
abcca994 | 211 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ad594e3a MD |
212 | list_for_each_entry(chan, &session->chan, list) { |
213 | ret = lttng_syscalls_destroy(chan); | |
214 | WARN_ON(ret); | |
215 | } | |
3c997079 MD |
216 | list_for_each_entry_safe(enabler, tmpenabler, |
217 | &session->enablers_head, node) | |
218 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 219 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 220 | _lttng_event_destroy(event); |
d83004aa JD |
221 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
222 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 223 | _lttng_channel_destroy(chan); |
d83004aa | 224 | } |
5a4afa8a | 225 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
226 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
227 | _lttng_metadata_channel_hangup(metadata_stream); | |
5a4afa8a | 228 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
229 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
230 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
231 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
232 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
233 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
234 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 235 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
236 | list_del(&session->list); |
237 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 238 | lttng_kvfree(session); |
4e3c1b9b MD |
239 | } |
240 | ||
601252cf MD |
241 | int lttng_session_statedump(struct lttng_session *session) |
242 | { | |
243 | int ret; | |
244 | ||
245 | mutex_lock(&sessions_mutex); | |
246 | ret = lttng_statedump_start(session); | |
247 | mutex_unlock(&sessions_mutex); | |
248 | return ret; | |
249 | } | |
250 | ||
a90917c3 | 251 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
252 | { |
253 | int ret = 0; | |
a90917c3 | 254 | struct lttng_channel *chan; |
c0e31d2e MD |
255 | |
256 | mutex_lock(&sessions_mutex); | |
257 | if (session->active) { | |
258 | ret = -EBUSY; | |
259 | goto end; | |
260 | } | |
c099397a | 261 | |
3c997079 MD |
262 | /* Set transient enabler state to "enabled" */ |
263 | session->tstate = 1; | |
264 | ||
4ef81e4a MD |
265 | /* We need to sync enablers with session before activation. */ |
266 | lttng_session_sync_enablers(session); | |
267 | ||
c099397a MD |
268 | /* |
269 | * Snapshot the number of events per channel to know the type of header | |
270 | * we need to use. | |
271 | */ | |
272 | list_for_each_entry(chan, &session->chan, list) { | |
273 | if (chan->header_type) | |
274 | continue; /* don't change it if session stop/restart */ | |
275 | if (chan->free_event_id < 31) | |
276 | chan->header_type = 1; /* compact */ | |
277 | else | |
278 | chan->header_type = 2; /* large */ | |
279 | } | |
280 | ||
64af2437 | 281 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
282 | list_for_each_entry(chan, &session->chan, list) { |
283 | if (chan->channel_type != METADATA_CHANNEL) | |
284 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
285 | } | |
64af2437 | 286 | |
a8f2d0c7 MJ |
287 | WRITE_ONCE(session->active, 1); |
288 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 289 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 290 | if (ret) { |
a8f2d0c7 | 291 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
292 | goto end; |
293 | } | |
294 | ret = lttng_statedump_start(session); | |
360f38ea | 295 | if (ret) |
a8f2d0c7 | 296 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
297 | end: |
298 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 299 | return ret; |
c0e31d2e MD |
300 | } |
301 | ||
a90917c3 | 302 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
303 | { |
304 | int ret = 0; | |
64af2437 | 305 | struct lttng_channel *chan; |
c0e31d2e MD |
306 | |
307 | mutex_lock(&sessions_mutex); | |
308 | if (!session->active) { | |
309 | ret = -EBUSY; | |
310 | goto end; | |
311 | } | |
a8f2d0c7 | 312 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
313 | |
314 | /* Set transient enabler state to "disabled" */ | |
315 | session->tstate = 0; | |
316 | lttng_session_sync_enablers(session); | |
64af2437 MD |
317 | |
318 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
319 | list_for_each_entry(chan, &session->chan, list) { |
320 | if (chan->channel_type != METADATA_CHANNEL) | |
321 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
322 | } | |
c0e31d2e MD |
323 | end: |
324 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 325 | return ret; |
c0e31d2e MD |
326 | } |
327 | ||
9616f0bf JD |
328 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
329 | { | |
330 | int ret = 0; | |
331 | struct lttng_channel *chan; | |
332 | struct lttng_event *event; | |
333 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
334 | struct lttng_metadata_stream *stream; | |
335 | ||
336 | mutex_lock(&sessions_mutex); | |
337 | if (!session->active) { | |
338 | ret = -EBUSY; | |
339 | goto end; | |
340 | } | |
341 | ||
342 | mutex_lock(&cache->lock); | |
343 | memset(cache->data, 0, cache->cache_alloc); | |
344 | cache->metadata_written = 0; | |
345 | cache->version++; | |
346 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
347 | stream->metadata_out = 0; | |
348 | stream->metadata_in = 0; | |
349 | } | |
350 | mutex_unlock(&cache->lock); | |
351 | ||
352 | session->metadata_dumped = 0; | |
353 | list_for_each_entry(chan, &session->chan, list) { | |
354 | chan->metadata_dumped = 0; | |
355 | } | |
356 | ||
357 | list_for_each_entry(event, &session->events, list) { | |
358 | event->metadata_dumped = 0; | |
359 | } | |
360 | ||
361 | ret = _lttng_session_metadata_statedump(session); | |
362 | ||
363 | end: | |
364 | mutex_unlock(&sessions_mutex); | |
365 | return ret; | |
366 | } | |
367 | ||
a90917c3 | 368 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 369 | { |
3c997079 | 370 | int ret = 0; |
e64957da | 371 | |
3c997079 MD |
372 | mutex_lock(&sessions_mutex); |
373 | if (channel->channel_type == METADATA_CHANNEL) { | |
374 | ret = -EPERM; | |
375 | goto end; | |
376 | } | |
377 | if (channel->enabled) { | |
378 | ret = -EEXIST; | |
379 | goto end; | |
380 | } | |
381 | /* Set transient enabler state to "enabled" */ | |
382 | channel->tstate = 1; | |
383 | lttng_session_sync_enablers(channel->session); | |
384 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 385 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
386 | end: |
387 | mutex_unlock(&sessions_mutex); | |
388 | return ret; | |
e64957da MD |
389 | } |
390 | ||
a90917c3 | 391 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 392 | { |
3c997079 | 393 | int ret = 0; |
e64957da | 394 | |
3c997079 MD |
395 | mutex_lock(&sessions_mutex); |
396 | if (channel->channel_type == METADATA_CHANNEL) { | |
397 | ret = -EPERM; | |
398 | goto end; | |
399 | } | |
400 | if (!channel->enabled) { | |
401 | ret = -EEXIST; | |
402 | goto end; | |
403 | } | |
404 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 405 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
406 | /* Set transient enabler state to "enabled" */ |
407 | channel->tstate = 0; | |
408 | lttng_session_sync_enablers(channel->session); | |
409 | end: | |
410 | mutex_unlock(&sessions_mutex); | |
411 | return ret; | |
e64957da MD |
412 | } |
413 | ||
a90917c3 | 414 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 415 | { |
3c997079 | 416 | int ret = 0; |
e64957da | 417 | |
3c997079 MD |
418 | mutex_lock(&sessions_mutex); |
419 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
420 | ret = -EPERM; | |
421 | goto end; | |
422 | } | |
423 | if (event->enabled) { | |
424 | ret = -EEXIST; | |
425 | goto end; | |
426 | } | |
a0493bef MD |
427 | switch (event->instrumentation) { |
428 | case LTTNG_KERNEL_TRACEPOINT: | |
429 | case LTTNG_KERNEL_SYSCALL: | |
430 | ret = -EINVAL; | |
431 | break; | |
432 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 433 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 434 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 435 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
436 | break; |
437 | case LTTNG_KERNEL_KRETPROBE: | |
438 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
439 | break; | |
1d00109f MJ |
440 | case LTTNG_KERNEL_FUNCTION: |
441 | lttng_fallthrough; | |
a0493bef MD |
442 | default: |
443 | WARN_ON_ONCE(1); | |
444 | ret = -EINVAL; | |
445 | } | |
3c997079 MD |
446 | end: |
447 | mutex_unlock(&sessions_mutex); | |
448 | return ret; | |
e64957da MD |
449 | } |
450 | ||
a90917c3 | 451 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 452 | { |
3c997079 | 453 | int ret = 0; |
e64957da | 454 | |
3c997079 MD |
455 | mutex_lock(&sessions_mutex); |
456 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
457 | ret = -EPERM; | |
458 | goto end; | |
459 | } | |
460 | if (!event->enabled) { | |
461 | ret = -EEXIST; | |
462 | goto end; | |
463 | } | |
a0493bef MD |
464 | switch (event->instrumentation) { |
465 | case LTTNG_KERNEL_TRACEPOINT: | |
466 | case LTTNG_KERNEL_SYSCALL: | |
467 | ret = -EINVAL; | |
468 | break; | |
469 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 470 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 471 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 472 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
473 | break; |
474 | case LTTNG_KERNEL_KRETPROBE: | |
475 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
476 | break; | |
1d00109f MJ |
477 | case LTTNG_KERNEL_FUNCTION: |
478 | lttng_fallthrough; | |
a0493bef MD |
479 | default: |
480 | WARN_ON_ONCE(1); | |
481 | ret = -EINVAL; | |
482 | } | |
3c997079 MD |
483 | end: |
484 | mutex_unlock(&sessions_mutex); | |
485 | return ret; | |
e64957da MD |
486 | } |
487 | ||
a90917c3 | 488 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 489 | { |
a90917c3 | 490 | struct lttng_transport *transport; |
f3d01b96 | 491 | |
a90917c3 | 492 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
493 | if (!strcmp(transport->name, name)) |
494 | return transport; | |
495 | } | |
496 | return NULL; | |
497 | } | |
498 | ||
a90917c3 | 499 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
500 | const char *transport_name, |
501 | void *buf_addr, | |
4e3c1b9b MD |
502 | size_t subbuf_size, size_t num_subbuf, |
503 | unsigned int switch_timer_interval, | |
d83004aa JD |
504 | unsigned int read_timer_interval, |
505 | enum channel_type channel_type) | |
4e3c1b9b | 506 | { |
a90917c3 MD |
507 | struct lttng_channel *chan; |
508 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
509 | |
510 | mutex_lock(&sessions_mutex); | |
d83004aa | 511 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 512 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 513 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
514 | if (!transport) { |
515 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
516 | transport_name); | |
c0e31d2e | 517 | goto notransport; |
f3d01b96 | 518 | } |
a33c9927 MD |
519 | if (!try_module_get(transport->owner)) { |
520 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
521 | goto notransport; | |
522 | } | |
a90917c3 | 523 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 524 | if (!chan) |
c0e31d2e | 525 | goto nomem; |
4e3c1b9b | 526 | chan->session = session; |
05d32c64 | 527 | chan->id = session->free_chan_id++; |
3b731ab1 | 528 | chan->ops = &transport->ops; |
125b4df4 MD |
529 | /* |
530 | * Note: the channel creation op already writes into the packet | |
531 | * headers. Therefore the "chan" information used as input | |
532 | * should be already accessible. | |
533 | */ | |
5f5ddf01 MD |
534 | chan->chan = transport->ops.channel_create(transport_name, |
535 | chan, buf_addr, subbuf_size, num_subbuf, | |
536 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
537 | if (!chan->chan) |
538 | goto create_error; | |
3c997079 | 539 | chan->tstate = 1; |
e64957da | 540 | chan->enabled = 1; |
a33c9927 | 541 | chan->transport = transport; |
d83004aa | 542 | chan->channel_type = channel_type; |
4e3c1b9b MD |
543 | list_add(&chan->list, &session->chan); |
544 | mutex_unlock(&sessions_mutex); | |
545 | return chan; | |
546 | ||
f3d01b96 MD |
547 | create_error: |
548 | kfree(chan); | |
c0e31d2e | 549 | nomem: |
a33c9927 MD |
550 | if (transport) |
551 | module_put(transport->owner); | |
c0e31d2e | 552 | notransport: |
e5382b6d | 553 | active: |
4e3c1b9b MD |
554 | mutex_unlock(&sessions_mutex); |
555 | return NULL; | |
556 | } | |
557 | ||
558 | /* | |
d83004aa JD |
559 | * Only used internally at session destruction for per-cpu channels, and |
560 | * when metadata channel is released. | |
561 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 562 | */ |
aa7c23a9 | 563 | static |
a90917c3 | 564 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 565 | { |
11b5a3c2 | 566 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 567 | module_put(chan->transport->owner); |
4e3c1b9b | 568 | list_del(&chan->list); |
8070f5c0 | 569 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
570 | kfree(chan); |
571 | } | |
572 | ||
d83004aa JD |
573 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
574 | { | |
575 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
576 | ||
577 | /* Protect the metadata cache with the sessions_mutex. */ | |
578 | mutex_lock(&sessions_mutex); | |
579 | _lttng_channel_destroy(chan); | |
580 | mutex_unlock(&sessions_mutex); | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
583 | ||
584 | static | |
585 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
586 | { | |
587 | stream->finalized = 1; | |
588 | wake_up_interruptible(&stream->read_wait); | |
589 | } | |
590 | ||
e5382b6d MD |
591 | /* |
592 | * Supports event creation while tracing session is active. | |
3c997079 | 593 | * Needs to be called with sessions mutex held. |
e5382b6d | 594 | */ |
3c997079 MD |
595 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
596 | struct lttng_kernel_event *event_param, | |
597 | void *filter, | |
598 | const struct lttng_event_desc *event_desc, | |
599 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 600 | { |
3c997079 | 601 | struct lttng_session *session = chan->session; |
a90917c3 | 602 | struct lttng_event *event; |
3c997079 MD |
603 | const char *event_name; |
604 | struct hlist_head *head; | |
605 | size_t name_len; | |
606 | uint32_t hash; | |
3d084699 | 607 | int ret; |
4e3c1b9b | 608 | |
abc0446a | 609 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 610 | ret = -EMFILE; |
e5382b6d | 611 | goto full; |
abc0446a | 612 | } |
3c997079 MD |
613 | |
614 | switch (itype) { | |
615 | case LTTNG_KERNEL_TRACEPOINT: | |
616 | event_name = event_desc->name; | |
617 | break; | |
618 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 619 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 620 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 621 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 622 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
623 | event_name = event_param->name; |
624 | break; | |
1d00109f MJ |
625 | case LTTNG_KERNEL_FUNCTION: |
626 | lttng_fallthrough; | |
3c997079 MD |
627 | default: |
628 | WARN_ON_ONCE(1); | |
629 | ret = -EINVAL; | |
630 | goto type_error; | |
631 | } | |
632 | name_len = strlen(event_name); | |
633 | hash = jhash(event_name, name_len, 0); | |
634 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 635 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
636 | WARN_ON_ONCE(!event->desc); |
637 | if (!strncmp(event->desc->name, event_name, | |
638 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
639 | && chan == event->chan) { | |
640 | ret = -EEXIST; | |
641 | goto exist; | |
abc0446a MD |
642 | } |
643 | } | |
3c997079 | 644 | |
11b5a3c2 | 645 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 646 | if (!event) { |
4cf0bf51 | 647 | ret = -ENOMEM; |
4e3c1b9b | 648 | goto cache_error; |
abc0446a | 649 | } |
4e3c1b9b MD |
650 | event->chan = chan; |
651 | event->filter = filter; | |
e5382b6d | 652 | event->id = chan->free_event_id++; |
3c997079 MD |
653 | event->instrumentation = itype; |
654 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 655 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
656 | INIT_LIST_HEAD(&event->enablers_ref_head); |
657 | ||
658 | switch (itype) { | |
ab2277d6 | 659 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
660 | /* Event will be enabled by enabler sync. */ |
661 | event->enabled = 0; | |
662 | event->registered = 0; | |
663 | event->desc = lttng_event_get(event_name); | |
abc0446a | 664 | if (!event->desc) { |
4cf0bf51 | 665 | ret = -ENOENT; |
d3dbe23c | 666 | goto register_error; |
abc0446a | 667 | } |
3c997079 MD |
668 | /* Populate lttng_event structure before event registration. */ |
669 | smp_wmb(); | |
baf20995 | 670 | break; |
ab2277d6 | 671 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
672 | /* |
673 | * Needs to be explicitly enabled after creation, since | |
674 | * we may want to apply filters. | |
675 | */ | |
676 | event->enabled = 0; | |
3c997079 MD |
677 | event->registered = 1; |
678 | /* | |
679 | * Populate lttng_event structure before event | |
680 | * registration. | |
681 | */ | |
682 | smp_wmb(); | |
683 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
684 | event_param->u.kprobe.symbol_name, |
685 | event_param->u.kprobe.offset, | |
686 | event_param->u.kprobe.addr, | |
687 | event); | |
abc0446a | 688 | if (ret) { |
4cf0bf51 | 689 | ret = -EINVAL; |
d6d808f3 | 690 | goto register_error; |
abc0446a | 691 | } |
edeb3137 MD |
692 | ret = try_module_get(event->desc->owner); |
693 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 694 | break; |
7371f44c MD |
695 | case LTTNG_KERNEL_KRETPROBE: |
696 | { | |
a90917c3 | 697 | struct lttng_event *event_return; |
7371f44c MD |
698 | |
699 | /* kretprobe defines 2 events */ | |
a0493bef MD |
700 | /* |
701 | * Needs to be explicitly enabled after creation, since | |
702 | * we may want to apply filters. | |
703 | */ | |
704 | event->enabled = 0; | |
3c997079 | 705 | event->registered = 1; |
7371f44c MD |
706 | event_return = |
707 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 708 | if (!event_return) { |
4cf0bf51 | 709 | ret = -ENOMEM; |
7371f44c | 710 | goto register_error; |
abc0446a | 711 | } |
7371f44c MD |
712 | event_return->chan = chan; |
713 | event_return->filter = filter; | |
714 | event_return->id = chan->free_event_id++; | |
a0493bef | 715 | event_return->enabled = 0; |
3c997079 MD |
716 | event_return->registered = 1; |
717 | event_return->instrumentation = itype; | |
92cc3e7f FD |
718 | INIT_LIST_HEAD(&event_return->bytecode_runtime_head); |
719 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
7371f44c | 720 | /* |
a90917c3 | 721 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
722 | */ |
723 | smp_wmb(); | |
3c997079 | 724 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
725 | event_param->u.kretprobe.symbol_name, |
726 | event_param->u.kretprobe.offset, | |
727 | event_param->u.kretprobe.addr, | |
728 | event, event_return); | |
729 | if (ret) { | |
730 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 731 | ret = -EINVAL; |
7371f44c MD |
732 | goto register_error; |
733 | } | |
734 | /* Take 2 refs on the module: one per event. */ | |
735 | ret = try_module_get(event->desc->owner); | |
736 | WARN_ON_ONCE(!ret); | |
737 | ret = try_module_get(event->desc->owner); | |
738 | WARN_ON_ONCE(!ret); | |
a90917c3 | 739 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 740 | event_return); |
abc0446a | 741 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
742 | if (ret) { |
743 | kmem_cache_free(event_cache, event_return); | |
744 | module_put(event->desc->owner); | |
745 | module_put(event->desc->owner); | |
746 | goto statedump_error; | |
747 | } | |
748 | list_add(&event_return->list, &chan->session->events); | |
749 | break; | |
750 | } | |
1ec65de1 | 751 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 752 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
753 | /* |
754 | * Needs to be explicitly enabled after creation, since | |
755 | * we may want to apply filters. | |
756 | */ | |
757 | event->enabled = 0; | |
3c997079 MD |
758 | event->registered = 0; |
759 | event->desc = event_desc; | |
ad594e3a MD |
760 | switch (event_param->u.syscall.entryexit) { |
761 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
762 | ret = -EINVAL; | |
763 | goto register_error; | |
764 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
765 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
766 | break; | |
767 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
768 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
769 | break; | |
770 | } | |
771 | switch (event_param->u.syscall.abi) { | |
772 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
773 | ret = -EINVAL; | |
774 | goto register_error; | |
775 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
776 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
777 | break; | |
778 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
779 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
780 | break; | |
781 | } | |
abc0446a | 782 | if (!event->desc) { |
4cf0bf51 | 783 | ret = -EINVAL; |
259b6cb3 | 784 | goto register_error; |
abc0446a | 785 | } |
1ec65de1 | 786 | break; |
149b9a9d | 787 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
788 | /* |
789 | * Needs to be explicitly enabled after creation, since | |
790 | * we may want to apply filters. | |
791 | */ | |
792 | event->enabled = 0; | |
793 | event->registered = 1; | |
3aed4dca | 794 | |
a344f64b FD |
795 | /* |
796 | * Populate lttng_event structure before event | |
797 | * registration. | |
798 | */ | |
799 | smp_wmb(); | |
149b9a9d YB |
800 | |
801 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 802 | event_param->u.uprobe.fd, |
149b9a9d YB |
803 | event); |
804 | if (ret) | |
805 | goto register_error; | |
806 | ret = try_module_get(event->desc->owner); | |
807 | WARN_ON_ONCE(!ret); | |
808 | break; | |
1d00109f MJ |
809 | case LTTNG_KERNEL_FUNCTION: |
810 | lttng_fallthrough; | |
baf20995 MD |
811 | default: |
812 | WARN_ON_ONCE(1); | |
4cf0bf51 | 813 | ret = -EINVAL; |
df07930b | 814 | goto register_error; |
baf20995 | 815 | } |
a90917c3 | 816 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
817 | WARN_ON_ONCE(ret > 0); |
818 | if (ret) { | |
c099397a | 819 | goto statedump_error; |
abc0446a | 820 | } |
3c997079 | 821 | hlist_add_head(&event->hlist, head); |
dda6a249 | 822 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
823 | return event; |
824 | ||
c099397a | 825 | statedump_error: |
259b6cb3 | 826 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 827 | register_error: |
11b5a3c2 | 828 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
829 | cache_error: |
830 | exist: | |
3c997079 | 831 | type_error: |
e5382b6d | 832 | full: |
4cf0bf51 | 833 | return ERR_PTR(ret); |
4e3c1b9b MD |
834 | } |
835 | ||
3c997079 MD |
836 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
837 | struct lttng_kernel_event *event_param, | |
838 | void *filter, | |
839 | const struct lttng_event_desc *event_desc, | |
840 | enum lttng_kernel_instrumentation itype) | |
841 | { | |
842 | struct lttng_event *event; | |
843 | ||
844 | mutex_lock(&sessions_mutex); | |
845 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
846 | itype); | |
847 | mutex_unlock(&sessions_mutex); | |
848 | return event; | |
849 | } | |
850 | ||
851 | /* Only used for tracepoints for now. */ | |
852 | static | |
853 | void register_event(struct lttng_event *event) | |
854 | { | |
855 | const struct lttng_event_desc *desc; | |
f127e61e | 856 | int ret = -EINVAL; |
3c997079 | 857 | |
3c997079 MD |
858 | if (event->registered) |
859 | return; | |
4ecb5ad5 | 860 | |
3c997079 | 861 | desc = event->desc; |
4ecb5ad5 MD |
862 | switch (event->instrumentation) { |
863 | case LTTNG_KERNEL_TRACEPOINT: | |
864 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
865 | desc->probe_callback, | |
866 | event); | |
867 | break; | |
868 | case LTTNG_KERNEL_SYSCALL: | |
ad594e3a | 869 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
870 | break; |
871 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 872 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 873 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
874 | case LTTNG_KERNEL_NOOP: |
875 | ret = 0; | |
876 | break; | |
1d00109f MJ |
877 | case LTTNG_KERNEL_FUNCTION: |
878 | lttng_fallthrough; | |
4ecb5ad5 MD |
879 | default: |
880 | WARN_ON_ONCE(1); | |
881 | } | |
3c997079 MD |
882 | if (!ret) |
883 | event->registered = 1; | |
884 | } | |
885 | ||
4e3c1b9b MD |
886 | /* |
887 | * Only used internally at session destruction. | |
888 | */ | |
a90917c3 | 889 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 890 | { |
4ecb5ad5 | 891 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
892 | int ret = -EINVAL; |
893 | ||
3c997079 MD |
894 | if (!event->registered) |
895 | return 0; | |
896 | ||
4ecb5ad5 | 897 | desc = event->desc; |
38d024ae | 898 | switch (event->instrumentation) { |
ab2277d6 | 899 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 900 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 901 | event->desc->probe_callback, |
11b5a3c2 | 902 | event); |
baf20995 | 903 | break; |
ab2277d6 | 904 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 905 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
906 | ret = 0; |
907 | break; | |
7371f44c MD |
908 | case LTTNG_KERNEL_KRETPROBE: |
909 | lttng_kretprobes_unregister(event); | |
910 | ret = 0; | |
911 | break; | |
33a39a3c | 912 | case LTTNG_KERNEL_SYSCALL: |
ad594e3a | 913 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
914 | break; |
915 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
916 | ret = 0; |
917 | break; | |
149b9a9d YB |
918 | case LTTNG_KERNEL_UPROBE: |
919 | lttng_uprobes_unregister(event); | |
920 | ret = 0; | |
921 | break; | |
1d00109f MJ |
922 | case LTTNG_KERNEL_FUNCTION: |
923 | lttng_fallthrough; | |
baf20995 MD |
924 | default: |
925 | WARN_ON_ONCE(1); | |
926 | } | |
3c997079 MD |
927 | if (!ret) |
928 | event->registered = 0; | |
dda6a249 MD |
929 | return ret; |
930 | } | |
931 | ||
932 | /* | |
933 | * Only used internally at session destruction. | |
934 | */ | |
be066e6c | 935 | static |
a90917c3 | 936 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 937 | { |
b3fdf78b MD |
938 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
939 | ||
edeb3137 MD |
940 | switch (event->instrumentation) { |
941 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 942 | lttng_event_put(event->desc); |
edeb3137 MD |
943 | break; |
944 | case LTTNG_KERNEL_KPROBE: | |
945 | module_put(event->desc->owner); | |
946 | lttng_kprobes_destroy_private(event); | |
947 | break; | |
7371f44c MD |
948 | case LTTNG_KERNEL_KRETPROBE: |
949 | module_put(event->desc->owner); | |
950 | lttng_kretprobes_destroy_private(event); | |
951 | break; | |
259b6cb3 | 952 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 953 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 954 | break; |
149b9a9d YB |
955 | case LTTNG_KERNEL_UPROBE: |
956 | module_put(event->desc->owner); | |
957 | lttng_uprobes_destroy_private(event); | |
958 | break; | |
1d00109f MJ |
959 | case LTTNG_KERNEL_FUNCTION: |
960 | lttng_fallthrough; | |
edeb3137 MD |
961 | default: |
962 | WARN_ON_ONCE(1); | |
963 | } | |
dda6a249 | 964 | list_del(&event->list); |
8070f5c0 | 965 | lttng_destroy_context(event->ctx); |
b3fdf78b MD |
966 | lttng_free_event_filter_runtime(event); |
967 | /* Free event enabler refs */ | |
968 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
969 | &event->enablers_ref_head, node) | |
970 | kfree(enabler_ref); | |
11b5a3c2 | 971 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
972 | } |
973 | ||
d1f652f8 MD |
974 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
975 | enum tracker_type tracker_type) | |
e0130fab | 976 | { |
d1f652f8 MD |
977 | switch (tracker_type) { |
978 | case TRACKER_PID: | |
979 | return &session->pid_tracker; | |
980 | case TRACKER_VPID: | |
981 | return &session->vpid_tracker; | |
982 | case TRACKER_UID: | |
983 | return &session->uid_tracker; | |
984 | case TRACKER_VUID: | |
985 | return &session->vuid_tracker; | |
986 | case TRACKER_GID: | |
987 | return &session->gid_tracker; | |
988 | case TRACKER_VGID: | |
989 | return &session->vgid_tracker; | |
990 | default: | |
991 | WARN_ON_ONCE(1); | |
992 | return NULL; | |
993 | } | |
994 | } | |
995 | ||
996 | int lttng_session_track_id(struct lttng_session *session, | |
997 | enum tracker_type tracker_type, int id) | |
998 | { | |
999 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1000 | int ret; |
1001 | ||
d1f652f8 MD |
1002 | tracker = get_tracker(session, tracker_type); |
1003 | if (!tracker) | |
1004 | return -EINVAL; | |
1005 | if (id < -1) | |
e0130fab MD |
1006 | return -EINVAL; |
1007 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1008 | if (id == -1) { |
1009 | /* track all ids: destroy tracker. */ | |
1010 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1011 | ret = 0; |
1012 | } else { | |
d1f652f8 | 1013 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1014 | } |
e0130fab MD |
1015 | mutex_unlock(&sessions_mutex); |
1016 | return ret; | |
1017 | } | |
1018 | ||
d1f652f8 MD |
1019 | int lttng_session_untrack_id(struct lttng_session *session, |
1020 | enum tracker_type tracker_type, int id) | |
e0130fab | 1021 | { |
d1f652f8 | 1022 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1023 | int ret; |
1024 | ||
d1f652f8 MD |
1025 | tracker = get_tracker(session, tracker_type); |
1026 | if (!tracker) | |
1027 | return -EINVAL; | |
1028 | if (id < -1) | |
e0130fab MD |
1029 | return -EINVAL; |
1030 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1031 | if (id == -1) { |
1032 | /* untrack all ids: replace by empty tracker. */ | |
1033 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1034 | } else { |
d1f652f8 | 1035 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1036 | } |
e0130fab MD |
1037 | mutex_unlock(&sessions_mutex); |
1038 | return ret; | |
1039 | } | |
1040 | ||
7e6f9ef6 | 1041 | static |
d1f652f8 | 1042 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1043 | { |
d1f652f8 MD |
1044 | struct lttng_id_tracker *id_tracker = m->private; |
1045 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1046 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1047 | int iter = 0, i; |
1048 | ||
1049 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1050 | if (id_tracker_p) { |
1051 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1052 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1053 | |
f934e302 | 1054 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1055 | if (iter++ >= *pos) |
1056 | return e; | |
1057 | } | |
1058 | } | |
1059 | } else { | |
d1f652f8 | 1060 | /* ID tracker disabled. */ |
7e6f9ef6 | 1061 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1062 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1063 | } |
1064 | iter++; | |
1065 | } | |
1066 | /* End of list */ | |
1067 | return NULL; | |
1068 | } | |
1069 | ||
1070 | /* Called with sessions_mutex held. */ | |
1071 | static | |
d1f652f8 | 1072 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1073 | { |
d1f652f8 MD |
1074 | struct lttng_id_tracker *id_tracker = m->private; |
1075 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1076 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1077 | int iter = 0, i; |
1078 | ||
1079 | (*ppos)++; | |
d1f652f8 MD |
1080 | if (id_tracker_p) { |
1081 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1082 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1083 | |
f934e302 | 1084 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1085 | if (iter++ >= *ppos) |
1086 | return e; | |
1087 | } | |
1088 | } | |
1089 | } else { | |
d1f652f8 | 1090 | /* ID tracker disabled. */ |
7e6f9ef6 | 1091 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1092 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1093 | iter++; |
1094 | } | |
1095 | ||
1096 | /* End of list */ | |
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | static | |
d1f652f8 | 1101 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1102 | { |
1103 | mutex_unlock(&sessions_mutex); | |
1104 | } | |
1105 | ||
1106 | static | |
d1f652f8 | 1107 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1108 | { |
d1f652f8 MD |
1109 | struct lttng_id_tracker *id_tracker = m->private; |
1110 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1111 | int id; | |
7e6f9ef6 | 1112 | |
d1f652f8 | 1113 | if (p == id_tracker_p) { |
7e6f9ef6 | 1114 | /* Tracker disabled. */ |
d1f652f8 | 1115 | id = -1; |
7e6f9ef6 | 1116 | } else { |
d1f652f8 | 1117 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1118 | |
d1f652f8 MD |
1119 | id = lttng_id_tracker_get_node_id(e); |
1120 | } | |
1121 | switch (id_tracker->tracker_type) { | |
1122 | case TRACKER_PID: | |
1123 | seq_printf(m, "process { pid = %d; };\n", id); | |
1124 | break; | |
1125 | case TRACKER_VPID: | |
1126 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1127 | break; | |
1128 | case TRACKER_UID: | |
1129 | seq_printf(m, "user { uid = %d; };\n", id); | |
1130 | break; | |
1131 | case TRACKER_VUID: | |
1132 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1133 | break; | |
1134 | case TRACKER_GID: | |
1135 | seq_printf(m, "group { gid = %d; };\n", id); | |
1136 | break; | |
1137 | case TRACKER_VGID: | |
1138 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1139 | break; | |
1140 | default: | |
1141 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1142 | } |
7e6f9ef6 MD |
1143 | return 0; |
1144 | } | |
1145 | ||
1146 | static | |
d1f652f8 MD |
1147 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1148 | .start = id_list_start, | |
1149 | .next = id_list_next, | |
1150 | .stop = id_list_stop, | |
1151 | .show = id_list_show, | |
7e6f9ef6 MD |
1152 | }; |
1153 | ||
1154 | static | |
d1f652f8 | 1155 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1156 | { |
d1f652f8 | 1157 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1158 | } |
1159 | ||
1160 | static | |
d1f652f8 | 1161 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1162 | { |
1163 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1164 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1165 | int ret; |
1166 | ||
d1f652f8 | 1167 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1168 | ret = seq_release(inode, file); |
d1f652f8 MD |
1169 | if (!ret) |
1170 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1171 | return ret; |
1172 | } | |
1173 | ||
d1f652f8 | 1174 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1175 | .owner = THIS_MODULE, |
d1f652f8 | 1176 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1177 | .read = seq_read, |
1178 | .llseek = seq_lseek, | |
d1f652f8 | 1179 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1180 | }; |
1181 | ||
d1f652f8 MD |
1182 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1183 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1184 | { |
d1f652f8 | 1185 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1186 | struct seq_file *m; |
1187 | int file_fd, ret; | |
1188 | ||
1189 | file_fd = lttng_get_unused_fd(); | |
1190 | if (file_fd < 0) { | |
1191 | ret = file_fd; | |
1192 | goto fd_error; | |
1193 | } | |
1194 | ||
d1f652f8 MD |
1195 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1196 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1197 | NULL, O_RDWR); |
d1f652f8 MD |
1198 | if (IS_ERR(tracker_ids_list_file)) { |
1199 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1200 | goto file_error; |
1201 | } | |
98d7281c MJ |
1202 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1203 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1204 | goto refcount_error; |
1205 | } | |
d1f652f8 | 1206 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1207 | if (ret < 0) |
1208 | goto open_error; | |
d1f652f8 MD |
1209 | m = tracker_ids_list_file->private_data; |
1210 | ||
1211 | m->private = get_tracker(session, tracker_type); | |
1212 | BUG_ON(!m->private); | |
1213 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1214 | |
1215 | return file_fd; | |
1216 | ||
1217 | open_error: | |
9c1f4643 MD |
1218 | atomic_long_dec(&session->file->f_count); |
1219 | refcount_error: | |
d1f652f8 | 1220 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1221 | file_error: |
1222 | put_unused_fd(file_fd); | |
1223 | fd_error: | |
1224 | return ret; | |
1225 | } | |
1226 | ||
3c997079 MD |
1227 | /* |
1228 | * Enabler management. | |
1229 | */ | |
1230 | static | |
4993071a PP |
1231 | int lttng_match_enabler_star_glob(const char *desc_name, |
1232 | const char *pattern) | |
3c997079 | 1233 | { |
cbc19040 MD |
1234 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1235 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1236 | return 0; |
1237 | return 1; | |
1238 | } | |
1239 | ||
1240 | static | |
4ecb5ad5 MD |
1241 | int lttng_match_enabler_name(const char *desc_name, |
1242 | const char *name) | |
3c997079 | 1243 | { |
4ecb5ad5 | 1244 | if (strcmp(desc_name, name)) |
3c997079 MD |
1245 | return 0; |
1246 | return 1; | |
1247 | } | |
1248 | ||
1249 | static | |
1250 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1251 | struct lttng_enabler *enabler) | |
1252 | { | |
4ecb5ad5 | 1253 | const char *desc_name, *enabler_name; |
ad594e3a | 1254 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1255 | |
1256 | enabler_name = enabler->event_param.name; | |
1257 | switch (enabler->event_param.instrumentation) { | |
1258 | case LTTNG_KERNEL_TRACEPOINT: | |
1259 | desc_name = desc->name; | |
ad594e3a MD |
1260 | switch (enabler->type) { |
1261 | case LTTNG_ENABLER_STAR_GLOB: | |
1262 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1263 | case LTTNG_ENABLER_NAME: | |
1264 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1265 | default: | |
1266 | return -EINVAL; | |
1267 | } | |
4ecb5ad5 MD |
1268 | break; |
1269 | case LTTNG_KERNEL_SYSCALL: | |
1270 | desc_name = desc->name; | |
ad594e3a | 1271 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1272 | desc_name += strlen("compat_"); |
ad594e3a MD |
1273 | compat = true; |
1274 | } | |
4ecb5ad5 MD |
1275 | if (!strncmp(desc_name, "syscall_exit_", |
1276 | strlen("syscall_exit_"))) { | |
1277 | desc_name += strlen("syscall_exit_"); | |
1278 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1279 | strlen("syscall_entry_"))) { | |
1280 | desc_name += strlen("syscall_entry_"); | |
ad594e3a | 1281 | entry = true; |
4ecb5ad5 MD |
1282 | } else { |
1283 | WARN_ON_ONCE(1); | |
1284 | return -EINVAL; | |
1285 | } | |
ad594e3a MD |
1286 | switch (enabler->event_param.u.syscall.entryexit) { |
1287 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1288 | break; | |
1289 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1290 | if (!entry) | |
1291 | return 0; | |
1292 | break; | |
1293 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1294 | if (entry) | |
1295 | return 0; | |
1296 | break; | |
1297 | default: | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | switch (enabler->event_param.u.syscall.abi) { | |
1301 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1302 | break; | |
1303 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1304 | if (compat) | |
1305 | return 0; | |
1306 | break; | |
1307 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1308 | if (!compat) | |
1309 | return 0; | |
1310 | break; | |
1311 | default: | |
1312 | return -EINVAL; | |
1313 | } | |
1314 | switch (enabler->event_param.u.syscall.match) { | |
1315 | case LTTNG_SYSCALL_MATCH_NAME: | |
1316 | switch (enabler->type) { | |
1317 | case LTTNG_ENABLER_STAR_GLOB: | |
1318 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1319 | case LTTNG_ENABLER_NAME: | |
1320 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1321 | default: | |
1322 | return -EINVAL; | |
1323 | } | |
1324 | break; | |
1325 | case LTTNG_SYSCALL_MATCH_NR: | |
1326 | return -EINVAL; /* Not implemented. */ | |
1327 | default: | |
1328 | return -EINVAL; | |
1329 | } | |
4ecb5ad5 MD |
1330 | break; |
1331 | default: | |
1332 | WARN_ON_ONCE(1); | |
1333 | return -EINVAL; | |
1334 | } | |
3c997079 MD |
1335 | } |
1336 | ||
1337 | static | |
1338 | int lttng_event_match_enabler(struct lttng_event *event, | |
1339 | struct lttng_enabler *enabler) | |
1340 | { | |
33a39a3c MD |
1341 | if (enabler->event_param.instrumentation != event->instrumentation) |
1342 | return 0; | |
3c997079 MD |
1343 | if (lttng_desc_match_enabler(event->desc, enabler) |
1344 | && event->chan == enabler->chan) | |
1345 | return 1; | |
1346 | else | |
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | static | |
1351 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1352 | struct lttng_enabler *enabler) | |
1353 | { | |
1354 | struct lttng_enabler_ref *enabler_ref; | |
1355 | ||
1356 | list_for_each_entry(enabler_ref, | |
1357 | &event->enablers_ref_head, node) { | |
1358 | if (enabler_ref->ref == enabler) | |
1359 | return enabler_ref; | |
1360 | } | |
1361 | return NULL; | |
1362 | } | |
1363 | ||
3c997079 | 1364 | static |
33a39a3c | 1365 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1366 | { |
1367 | struct lttng_session *session = enabler->chan->session; | |
1368 | struct lttng_probe_desc *probe_desc; | |
1369 | const struct lttng_event_desc *desc; | |
1370 | int i; | |
1371 | struct list_head *probe_list; | |
1372 | ||
1373 | probe_list = lttng_get_probe_list_head(); | |
1374 | /* | |
1375 | * For each probe event, if we find that a probe event matches | |
1376 | * our enabler, create an associated lttng_event if not | |
1377 | * already present. | |
1378 | */ | |
1379 | list_for_each_entry(probe_desc, probe_list, head) { | |
1380 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1381 | int found = 0; | |
1382 | struct hlist_head *head; | |
1383 | const char *event_name; | |
1384 | size_t name_len; | |
1385 | uint32_t hash; | |
1386 | struct lttng_event *event; | |
1387 | ||
1388 | desc = probe_desc->event_desc[i]; | |
1389 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1390 | continue; | |
1391 | event_name = desc->name; | |
1392 | name_len = strlen(event_name); | |
1393 | ||
1394 | /* | |
1395 | * Check if already created. | |
1396 | */ | |
1397 | hash = jhash(event_name, name_len, 0); | |
1398 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1399 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1400 | if (event->desc == desc |
1401 | && event->chan == enabler->chan) | |
1402 | found = 1; | |
1403 | } | |
1404 | if (found) | |
1405 | continue; | |
1406 | ||
1407 | /* | |
1408 | * We need to create an event for this | |
1409 | * event probe. | |
1410 | */ | |
1411 | event = _lttng_event_create(enabler->chan, | |
1412 | NULL, NULL, desc, | |
1413 | LTTNG_KERNEL_TRACEPOINT); | |
1414 | if (!event) { | |
1415 | printk(KERN_INFO "Unable to create event %s\n", | |
1416 | probe_desc->event_desc[i]->name); | |
1417 | } | |
1418 | } | |
1419 | } | |
1420 | } | |
1421 | ||
33a39a3c MD |
1422 | static |
1423 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1424 | { | |
1425 | int ret; | |
1426 | ||
1427 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1428 | WARN_ON_ONCE(ret); | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * Create struct lttng_event if it is missing and present in the list of | |
1433 | * tracepoint probes. | |
1434 | * Should be called with sessions mutex held. | |
1435 | */ | |
1436 | static | |
1437 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1438 | { | |
1439 | switch (enabler->event_param.instrumentation) { | |
1440 | case LTTNG_KERNEL_TRACEPOINT: | |
1441 | lttng_create_tracepoint_if_missing(enabler); | |
1442 | break; | |
1443 | case LTTNG_KERNEL_SYSCALL: | |
1444 | lttng_create_syscall_if_missing(enabler); | |
1445 | break; | |
1446 | default: | |
1447 | WARN_ON_ONCE(1); | |
1448 | break; | |
1449 | } | |
1450 | } | |
1451 | ||
3c997079 MD |
1452 | /* |
1453 | * Create events associated with an enabler (if not already present), | |
1454 | * and add backward reference from the event to the enabler. | |
1455 | * Should be called with sessions mutex held. | |
1456 | */ | |
1457 | static | |
1458 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1459 | { | |
ad594e3a MD |
1460 | struct lttng_channel *chan = enabler->chan; |
1461 | struct lttng_session *session = chan->session; | |
3c997079 MD |
1462 | struct lttng_event *event; |
1463 | ||
ad594e3a MD |
1464 | if (enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1465 | enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1466 | enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1467 | enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1468 | !strcmp(enabler->event_param.name, "*")) { | |
1469 | if (enabler->enabled) | |
1470 | WRITE_ONCE(chan->syscall_all, 1); | |
1471 | else | |
1472 | WRITE_ONCE(chan->syscall_all, 0); | |
1473 | } | |
1474 | ||
3c997079 MD |
1475 | /* First ensure that probe events are created for this enabler. */ |
1476 | lttng_create_event_if_missing(enabler); | |
1477 | ||
1478 | /* For each event matching enabler in session event list. */ | |
1479 | list_for_each_entry(event, &session->events, list) { | |
1480 | struct lttng_enabler_ref *enabler_ref; | |
1481 | ||
1482 | if (!lttng_event_match_enabler(event, enabler)) | |
1483 | continue; | |
1484 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1485 | if (!enabler_ref) { | |
1486 | /* | |
1487 | * If no backward ref, create it. | |
1488 | * Add backward ref from event to enabler. | |
1489 | */ | |
1490 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1491 | if (!enabler_ref) | |
1492 | return -ENOMEM; | |
1493 | enabler_ref->ref = enabler; | |
1494 | list_add(&enabler_ref->node, | |
1495 | &event->enablers_ref_head); | |
1496 | } | |
1497 | ||
f127e61e MD |
1498 | /* |
1499 | * Link filter bytecodes if not linked yet. | |
1500 | */ | |
1501 | lttng_enabler_event_link_bytecode(event, enabler); | |
1502 | ||
3c997079 MD |
1503 | /* TODO: merge event context. */ |
1504 | } | |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Called at module load: connect the probe on all enablers matching | |
1510 | * this event. | |
1511 | * Called with sessions lock held. | |
1512 | */ | |
1513 | int lttng_fix_pending_events(void) | |
1514 | { | |
1515 | struct lttng_session *session; | |
1516 | ||
1517 | list_for_each_entry(session, &sessions, list) | |
1518 | lttng_session_lazy_sync_enablers(session); | |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1523 | struct lttng_kernel_event *event_param, | |
1524 | struct lttng_channel *chan) | |
1525 | { | |
1526 | struct lttng_enabler *enabler; | |
1527 | ||
1528 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1529 | if (!enabler) | |
1530 | return NULL; | |
1531 | enabler->type = type; | |
07dfc1d0 | 1532 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1533 | memcpy(&enabler->event_param, event_param, |
1534 | sizeof(enabler->event_param)); | |
1535 | enabler->chan = chan; | |
1536 | /* ctx left NULL */ | |
4fd19d8a | 1537 | enabler->enabled = 0; |
3c997079 MD |
1538 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1539 | mutex_lock(&sessions_mutex); | |
1540 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1541 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1542 | mutex_unlock(&sessions_mutex); | |
1543 | return enabler; | |
1544 | } | |
1545 | ||
1546 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1547 | { | |
1548 | mutex_lock(&sessions_mutex); | |
1549 | enabler->enabled = 1; | |
1550 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1551 | mutex_unlock(&sessions_mutex); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1556 | { | |
1557 | mutex_lock(&sessions_mutex); | |
1558 | enabler->enabled = 0; | |
1559 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1560 | mutex_unlock(&sessions_mutex); | |
1561 | return 0; | |
1562 | } | |
1563 | ||
07dfc1d0 MD |
1564 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1565 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1566 | { | |
1567 | struct lttng_filter_bytecode_node *bytecode_node; | |
1568 | uint32_t bytecode_len; | |
1569 | int ret; | |
1570 | ||
1571 | ret = get_user(bytecode_len, &bytecode->len); | |
1572 | if (ret) | |
1573 | return ret; | |
1574 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1575 | GFP_KERNEL); | |
1576 | if (!bytecode_node) | |
1577 | return -ENOMEM; | |
1578 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1579 | sizeof(*bytecode) + bytecode_len); | |
1580 | if (ret) | |
1581 | goto error_free; | |
1582 | bytecode_node->enabler = enabler; | |
1583 | /* Enforce length based on allocated size */ | |
1584 | bytecode_node->bc.len = bytecode_len; | |
1585 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1586 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1587 | return 0; | |
1588 | ||
1589 | error_free: | |
1590 | kfree(bytecode_node); | |
1591 | return ret; | |
1592 | } | |
1593 | ||
3aed4dca FD |
1594 | int lttng_event_add_callsite(struct lttng_event *event, |
1595 | struct lttng_kernel_event_callsite __user *callsite) | |
1596 | { | |
1597 | ||
1598 | switch (event->instrumentation) { | |
1599 | case LTTNG_KERNEL_UPROBE: | |
1600 | return lttng_uprobes_add_callsite(event, callsite); | |
1601 | default: | |
1602 | return -EINVAL; | |
1603 | } | |
1604 | } | |
1605 | ||
3c997079 MD |
1606 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1607 | struct lttng_kernel_context *context_param) | |
1608 | { | |
1609 | return -ENOSYS; | |
1610 | } | |
1611 | ||
1612 | static | |
1613 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1614 | { | |
07dfc1d0 MD |
1615 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1616 | ||
1617 | /* Destroy filter bytecode */ | |
1618 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1619 | &enabler->filter_bytecode_head, node) { | |
1620 | kfree(filter_node); | |
1621 | } | |
1622 | ||
3c997079 MD |
1623 | /* Destroy contexts */ |
1624 | lttng_destroy_context(enabler->ctx); | |
1625 | ||
1626 | list_del(&enabler->node); | |
1627 | kfree(enabler); | |
1628 | } | |
1629 | ||
1630 | /* | |
1631 | * lttng_session_sync_enablers should be called just before starting a | |
1632 | * session. | |
1633 | * Should be called with sessions mutex held. | |
1634 | */ | |
1635 | static | |
1636 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1637 | { | |
1638 | struct lttng_enabler *enabler; | |
1639 | struct lttng_event *event; | |
1640 | ||
1641 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1642 | lttng_enabler_ref_events(enabler); | |
1643 | /* | |
1644 | * For each event, if at least one of its enablers is enabled, | |
1645 | * and its channel and session transient states are enabled, we | |
1646 | * enable the event, else we disable it. | |
1647 | */ | |
1648 | list_for_each_entry(event, &session->events, list) { | |
1649 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1650 | struct lttng_bytecode_runtime *runtime; |
1651 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1652 | |
4ecb5ad5 MD |
1653 | switch (event->instrumentation) { |
1654 | case LTTNG_KERNEL_TRACEPOINT: | |
1655 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1656 | /* Enable events */ |
1657 | list_for_each_entry(enabler_ref, | |
1658 | &event->enablers_ref_head, node) { | |
1659 | if (enabler_ref->ref->enabled) { | |
1660 | enabled = 1; | |
1661 | break; | |
1662 | } | |
1663 | } | |
4ecb5ad5 MD |
1664 | break; |
1665 | default: | |
3c997079 MD |
1666 | /* Not handled with lazy sync. */ |
1667 | continue; | |
1668 | } | |
1669 | /* | |
1670 | * Enabled state is based on union of enablers, with | |
1671 | * intesection of session and channel transient enable | |
1672 | * states. | |
1673 | */ | |
1674 | enabled = enabled && session->tstate && event->chan->tstate; | |
1675 | ||
a8f2d0c7 | 1676 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1677 | /* |
1678 | * Sync tracepoint registration with event enabled | |
1679 | * state. | |
1680 | */ | |
1681 | if (enabled) { | |
1682 | register_event(event); | |
1683 | } else { | |
1684 | _lttng_event_unregister(event); | |
1685 | } | |
07dfc1d0 MD |
1686 | |
1687 | /* Check if has enablers without bytecode enabled */ | |
1688 | list_for_each_entry(enabler_ref, | |
1689 | &event->enablers_ref_head, node) { | |
1690 | if (enabler_ref->ref->enabled | |
1691 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1692 | has_enablers_without_bytecode = 1; | |
1693 | break; | |
1694 | } | |
1695 | } | |
1696 | event->has_enablers_without_bytecode = | |
1697 | has_enablers_without_bytecode; | |
1698 | ||
1699 | /* Enable filters */ | |
1700 | list_for_each_entry(runtime, | |
f127e61e | 1701 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1702 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1703 | } |
1704 | } | |
1705 | ||
1706 | /* | |
1707 | * Apply enablers to session events, adding events to session if need | |
1708 | * be. It is required after each modification applied to an active | |
1709 | * session, and right before session "start". | |
1710 | * "lazy" sync means we only sync if required. | |
1711 | * Should be called with sessions mutex held. | |
1712 | */ | |
1713 | static | |
1714 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1715 | { | |
1716 | /* We can skip if session is not active */ | |
1717 | if (!session->active) | |
1718 | return; | |
1719 | lttng_session_sync_enablers(session); | |
1720 | } | |
1721 | ||
1ec3f75a | 1722 | /* |
d83004aa JD |
1723 | * Serialize at most one packet worth of metadata into a metadata |
1724 | * channel. | |
92d9f5e6 MD |
1725 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1726 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1727 | * allows us to do racy operations such as looking for remaining space left in | |
1728 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1729 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1730 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1731 | * Returns the number of bytes written in the channel, 0 if no data |
1732 | * was written and a negative value on error. | |
1ec3f75a | 1733 | */ |
b3b8072b | 1734 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
122c63cb | 1735 | struct channel *chan, bool *coherent) |
d83004aa JD |
1736 | { |
1737 | struct lib_ring_buffer_ctx ctx; | |
1738 | int ret = 0; | |
1739 | size_t len, reserve_len; | |
1740 | ||
f613e3e6 | 1741 | /* |
92d9f5e6 MD |
1742 | * Ensure we support mutiple get_next / put sequences followed by |
1743 | * put_next. The metadata cache lock protects reading the metadata | |
1744 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1745 | * "flush" operations on the buffer invoked by different processes. | |
1746 | * Moreover, since the metadata cache memory can be reallocated, we | |
1747 | * need to have exclusive access against updates even though we only | |
1748 | * read it. | |
f613e3e6 | 1749 | */ |
92d9f5e6 | 1750 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1751 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1752 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1753 | goto end; |
f613e3e6 | 1754 | |
9616f0bf JD |
1755 | /* Metadata regenerated, change the version. */ |
1756 | if (stream->metadata_cache->version != stream->version) | |
1757 | stream->version = stream->metadata_cache->version; | |
1758 | ||
d83004aa | 1759 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1760 | stream->metadata_in; |
9de2c215 | 1761 | if (!len) |
de23d59d | 1762 | goto end; |
d83004aa | 1763 | reserve_len = min_t(size_t, |
b3b8072b | 1764 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1765 | len); |
b3b8072b | 1766 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1767 | sizeof(char), -1); |
1768 | /* | |
1769 | * If reservation failed, return an error to the caller. | |
1770 | */ | |
b3b8072b | 1771 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1772 | if (ret != 0) { |
1773 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
122c63cb | 1774 | stream->coherent = false; |
d83004aa JD |
1775 | goto end; |
1776 | } | |
b3b8072b | 1777 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1778 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1779 | reserve_len); |
b3b8072b | 1780 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1781 | stream->metadata_in += reserve_len; |
3780dda9 | 1782 | if (reserve_len < len) |
122c63cb MD |
1783 | stream->coherent = false; |
1784 | else | |
1785 | stream->coherent = true; | |
d83004aa JD |
1786 | ret = reserve_len; |
1787 | ||
1788 | end: | |
122c63cb MD |
1789 | if (coherent) |
1790 | *coherent = stream->coherent; | |
92d9f5e6 | 1791 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1792 | return ret; |
1793 | } | |
1794 | ||
122c63cb MD |
1795 | static |
1796 | void lttng_metadata_begin(struct lttng_session *session) | |
1797 | { | |
3780dda9 MD |
1798 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1799 | mutex_lock(&session->metadata_cache->lock); | |
122c63cb MD |
1800 | } |
1801 | ||
1802 | static | |
1803 | void lttng_metadata_end(struct lttng_session *session) | |
1804 | { | |
3780dda9 MD |
1805 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1806 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1807 | struct lttng_metadata_stream *stream; | |
1808 | ||
3780dda9 MD |
1809 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1810 | wake_up_interruptible(&stream->read_wait); | |
e0d82ce5 | 1811 | mutex_unlock(&session->metadata_cache->lock); |
3780dda9 | 1812 | } |
122c63cb MD |
1813 | } |
1814 | ||
d83004aa JD |
1815 | /* |
1816 | * Write the metadata to the metadata cache. | |
1817 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1818 | * The metadata cache lock protects us from concurrent read access from |
1819 | * thread outputting metadata content to ring buffer. | |
122c63cb MD |
1820 | * The content of the printf is printed as a single atomic metadata |
1821 | * transaction. | |
d83004aa | 1822 | */ |
a90917c3 | 1823 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1824 | const char *fmt, ...) |
1825 | { | |
c099397a | 1826 | char *str; |
d83004aa | 1827 | size_t len; |
c099397a MD |
1828 | va_list ap; |
1829 | ||
57ccbfa6 | 1830 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
1831 | |
1832 | va_start(ap, fmt); | |
1833 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1834 | va_end(ap); | |
1835 | if (!str) | |
1836 | return -ENOMEM; | |
1837 | ||
1ec3f75a | 1838 | len = strlen(str); |
3780dda9 | 1839 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1840 | if (session->metadata_cache->metadata_written + len > |
1841 | session->metadata_cache->cache_alloc) { | |
1842 | char *tmp_cache_realloc; | |
1843 | unsigned int tmp_cache_alloc_size; | |
1844 | ||
1845 | tmp_cache_alloc_size = max_t(unsigned int, | |
1846 | session->metadata_cache->cache_alloc + len, | |
1847 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1848 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1849 | if (!tmp_cache_realloc) |
1850 | goto err; | |
a606b6e8 ML |
1851 | if (session->metadata_cache->data) { |
1852 | memcpy(tmp_cache_realloc, | |
1853 | session->metadata_cache->data, | |
1854 | session->metadata_cache->cache_alloc); | |
1855 | vfree(session->metadata_cache->data); | |
1856 | } | |
1857 | ||
d83004aa JD |
1858 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1859 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1860 | } |
d83004aa JD |
1861 | memcpy(session->metadata_cache->data + |
1862 | session->metadata_cache->metadata_written, | |
1863 | str, len); | |
1864 | session->metadata_cache->metadata_written += len; | |
c099397a | 1865 | kfree(str); |
d83004aa | 1866 | |
d83004aa JD |
1867 | return 0; |
1868 | ||
1869 | err: | |
1870 | kfree(str); | |
1871 | return -ENOMEM; | |
c099397a MD |
1872 | } |
1873 | ||
f513b2bf MD |
1874 | static |
1875 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1876 | { | |
1877 | size_t i; | |
1878 | ||
1879 | for (i = 0; i < nesting; i++) { | |
1880 | int ret; | |
1881 | ||
1882 | ret = lttng_metadata_printf(session, " "); | |
1883 | if (ret) { | |
1884 | return ret; | |
1885 | } | |
1886 | } | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | /* | |
1891 | * Must be called with sessions_mutex held. | |
1892 | */ | |
1893 | static | |
1894 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1895 | const struct lttng_type *type, | |
1896 | size_t nesting) | |
1897 | { | |
1898 | int ret; | |
1899 | uint32_t i, nr_fields; | |
1900 | ||
1901 | ret = print_tabs(session, nesting); | |
1902 | if (ret) | |
1903 | return ret; | |
1904 | ret = lttng_metadata_printf(session, | |
1905 | "struct {\n"); | |
1906 | if (ret) | |
1907 | return ret; | |
1908 | nr_fields = type->u._struct.nr_fields; | |
1909 | for (i = 0; i < nr_fields; i++) { | |
1910 | const struct lttng_event_field *iter_field; | |
1911 | ||
1912 | iter_field = &type->u._struct.fields[i]; | |
1913 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1914 | if (ret) | |
1915 | return ret; | |
1916 | } | |
1917 | ret = print_tabs(session, nesting); | |
1918 | if (ret) | |
1919 | return ret; | |
1920 | ret = lttng_metadata_printf(session, | |
1921 | "}"); | |
1922 | return ret; | |
1923 | } | |
1924 | ||
1925 | /* | |
1926 | * Must be called with sessions_mutex held. | |
1927 | */ | |
1928 | static | |
1929 | int _lttng_struct_statedump(struct lttng_session *session, | |
1930 | const struct lttng_event_field *field, | |
1931 | size_t nesting) | |
1932 | { | |
1933 | int ret; | |
1934 | ||
1935 | ret = _lttng_struct_type_statedump(session, | |
1936 | &field->type, nesting); | |
1937 | if (ret) | |
1938 | return ret; | |
1939 | ret = lttng_metadata_printf(session, | |
1940 | "_%s;\n", | |
1941 | field->name); | |
1942 | return ret; | |
1943 | } | |
1944 | ||
65c85aa6 MD |
1945 | /* |
1946 | * Must be called with sessions_mutex held. | |
1947 | */ | |
1948 | static | |
1949 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1950 | const struct lttng_type *type, | |
1951 | size_t nesting) | |
1952 | { | |
1953 | int ret; | |
1954 | uint32_t i, nr_choices; | |
1955 | ||
1956 | ret = print_tabs(session, nesting); | |
1957 | if (ret) | |
1958 | return ret; | |
1959 | ret = lttng_metadata_printf(session, | |
1960 | "variant <_%s> {\n", | |
1961 | type->u.variant.tag_name); | |
1962 | if (ret) | |
1963 | return ret; | |
1964 | nr_choices = type->u.variant.nr_choices; | |
1965 | for (i = 0; i < nr_choices; i++) { | |
1966 | const struct lttng_event_field *iter_field; | |
1967 | ||
1968 | iter_field = &type->u.variant.choices[i]; | |
1969 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1970 | if (ret) | |
1971 | return ret; | |
1972 | } | |
1973 | ret = print_tabs(session, nesting); | |
1974 | if (ret) | |
1975 | return ret; | |
1976 | ret = lttng_metadata_printf(session, | |
1977 | "}"); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | /* | |
1982 | * Must be called with sessions_mutex held. | |
1983 | */ | |
1984 | static | |
1985 | int _lttng_variant_statedump(struct lttng_session *session, | |
1986 | const struct lttng_event_field *field, | |
1987 | size_t nesting) | |
1988 | { | |
1989 | int ret; | |
1990 | ||
1991 | ret = _lttng_variant_type_statedump(session, | |
1992 | &field->type, nesting); | |
1993 | if (ret) | |
1994 | return ret; | |
1995 | ret = lttng_metadata_printf(session, | |
1996 | "_%s;\n", | |
1997 | field->name); | |
1998 | return ret; | |
1999 | } | |
2000 | ||
f513b2bf MD |
2001 | /* |
2002 | * Must be called with sessions_mutex held. | |
2003 | */ | |
2004 | static | |
2005 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
2006 | const struct lttng_event_field *field, | |
2007 | size_t nesting) | |
2008 | { | |
2009 | int ret; | |
2010 | const struct lttng_type *elem_type; | |
2011 | ||
65c85aa6 | 2012 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
2013 | elem_type = field->type.u.array_compound.elem_type; |
2014 | switch (elem_type->atype) { | |
2015 | case atype_struct: | |
2016 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
2017 | if (ret) | |
2018 | return ret; | |
2019 | break; | |
65c85aa6 MD |
2020 | case atype_variant: |
2021 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
2022 | if (ret) | |
2023 | return ret; | |
2024 | break; | |
f513b2bf MD |
2025 | default: |
2026 | return -EINVAL; | |
2027 | } | |
2028 | ret = lttng_metadata_printf(session, | |
2029 | " _%s[%u];\n", | |
2030 | field->name, | |
2031 | field->type.u.array_compound.length); | |
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Must be called with sessions_mutex held. | |
2037 | */ | |
2038 | static | |
2039 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
2040 | const struct lttng_event_field *field, | |
2041 | size_t nesting) | |
2042 | { | |
2043 | int ret; | |
2044 | const char *length_name; | |
2045 | const struct lttng_type *elem_type; | |
2046 | ||
2047 | length_name = field->type.u.sequence_compound.length_name; | |
2048 | ||
65c85aa6 | 2049 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
2050 | elem_type = field->type.u.sequence_compound.elem_type; |
2051 | switch (elem_type->atype) { | |
2052 | case atype_struct: | |
2053 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
2054 | if (ret) | |
2055 | return ret; | |
2056 | break; | |
65c85aa6 MD |
2057 | case atype_variant: |
2058 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
2059 | if (ret) | |
2060 | return ret; | |
2061 | break; | |
f513b2bf MD |
2062 | default: |
2063 | return -EINVAL; | |
2064 | } | |
2065 | ret = lttng_metadata_printf(session, | |
2066 | " _%s[ _%s ];\n", | |
2067 | field->name, | |
2068 | length_name); | |
2069 | return ret; | |
2070 | } | |
2071 | ||
141ddf28 MD |
2072 | /* |
2073 | * Must be called with sessions_mutex held. | |
2074 | */ | |
2075 | static | |
2076 | int _lttng_enum_statedump(struct lttng_session *session, | |
2077 | const struct lttng_event_field *field, | |
2078 | size_t nesting) | |
2079 | { | |
2080 | const struct lttng_enum_desc *enum_desc; | |
2081 | const struct lttng_integer_type *container_type; | |
2082 | int ret; | |
2083 | unsigned int i, nr_entries; | |
2084 | ||
2085 | enum_desc = field->type.u.basic.enumeration.desc; | |
2086 | container_type = &field->type.u.basic.enumeration.container_type; | |
2087 | nr_entries = enum_desc->nr_entries; | |
2088 | ||
2089 | ret = print_tabs(session, nesting); | |
2090 | if (ret) | |
2091 | goto end; | |
2092 | ret = lttng_metadata_printf(session, | |
578e68ec | 2093 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
2094 | container_type->size, |
2095 | container_type->alignment, | |
2096 | container_type->signedness, | |
2097 | (container_type->encoding == lttng_encode_none) | |
2098 | ? "none" | |
2099 | : (container_type->encoding == lttng_encode_UTF8) | |
2100 | ? "UTF8" | |
2101 | : "ASCII", | |
578e68ec GB |
2102 | container_type->base, |
2103 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2104 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
2105 | #else | |
2106 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
2107 | #endif | |
2108 | ); | |
141ddf28 MD |
2109 | if (ret) |
2110 | goto end; | |
2111 | /* Dump all entries */ | |
2112 | for (i = 0; i < nr_entries; i++) { | |
2113 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2114 | int j, len; | |
2115 | ||
2116 | ret = print_tabs(session, nesting + 1); | |
2117 | if (ret) | |
2118 | goto end; | |
2119 | ret = lttng_metadata_printf(session, | |
2120 | "\""); | |
2121 | if (ret) | |
2122 | goto end; | |
2123 | len = strlen(entry->string); | |
2124 | /* Escape the character '"' */ | |
2125 | for (j = 0; j < len; j++) { | |
2126 | char c = entry->string[j]; | |
2127 | ||
2128 | switch (c) { | |
2129 | case '"': | |
2130 | ret = lttng_metadata_printf(session, | |
2131 | "\\\""); | |
2132 | break; | |
2133 | case '\\': | |
2134 | ret = lttng_metadata_printf(session, | |
2135 | "\\\\"); | |
2136 | break; | |
2137 | default: | |
2138 | ret = lttng_metadata_printf(session, | |
2139 | "%c", c); | |
2140 | break; | |
2141 | } | |
2142 | if (ret) | |
2143 | goto end; | |
2144 | } | |
08ad1061 PP |
2145 | ret = lttng_metadata_printf(session, "\""); |
2146 | if (ret) | |
2147 | goto end; | |
2148 | ||
2149 | if (entry->options.is_auto) { | |
2150 | ret = lttng_metadata_printf(session, ",\n"); | |
2151 | if (ret) | |
2152 | goto end; | |
141ddf28 | 2153 | } else { |
7c559490 MD |
2154 | ret = lttng_metadata_printf(session, |
2155 | " = "); | |
2156 | if (ret) | |
2157 | goto end; | |
2158 | if (entry->start.signedness) | |
141ddf28 | 2159 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2160 | "%lld", (long long) entry->start.value); |
2161 | else | |
2162 | ret = lttng_metadata_printf(session, | |
2163 | "%llu", entry->start.value); | |
2164 | if (ret) | |
2165 | goto end; | |
2166 | if (entry->start.signedness == entry->end.signedness && | |
2167 | entry->start.value | |
2168 | == entry->end.value) { | |
141ddf28 | 2169 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2170 | ",\n"); |
2171 | } else { | |
2172 | if (entry->end.signedness) { | |
2173 | ret = lttng_metadata_printf(session, | |
2174 | " ... %lld,\n", | |
2175 | (long long) entry->end.value); | |
2176 | } else { | |
2177 | ret = lttng_metadata_printf(session, | |
2178 | " ... %llu,\n", | |
2179 | entry->end.value); | |
2180 | } | |
141ddf28 | 2181 | } |
7c559490 MD |
2182 | if (ret) |
2183 | goto end; | |
141ddf28 | 2184 | } |
141ddf28 MD |
2185 | } |
2186 | ret = print_tabs(session, nesting); | |
2187 | if (ret) | |
2188 | goto end; | |
2189 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2190 | field->name); | |
2191 | end: | |
2192 | return ret; | |
2193 | } | |
2194 | ||
d83004aa JD |
2195 | /* |
2196 | * Must be called with sessions_mutex held. | |
2197 | */ | |
c099397a | 2198 | static |
a90917c3 | 2199 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2200 | const struct lttng_event_field *field, |
2201 | size_t nesting) | |
c099397a | 2202 | { |
c099397a | 2203 | int ret = 0; |
c099397a | 2204 | |
8070f5c0 MD |
2205 | switch (field->type.atype) { |
2206 | case atype_integer: | |
f513b2bf MD |
2207 | ret = print_tabs(session, nesting); |
2208 | if (ret) | |
2209 | return ret; | |
8070f5c0 | 2210 | ret = lttng_metadata_printf(session, |
f513b2bf | 2211 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2212 | field->type.u.basic.integer.size, |
2213 | field->type.u.basic.integer.alignment, | |
2214 | field->type.u.basic.integer.signedness, | |
2215 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2216 | ? "none" | |
2217 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2218 | ? "UTF8" | |
2219 | : "ASCII", | |
2220 | field->type.u.basic.integer.base, | |
5214fa50 | 2221 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2222 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2223 | #else |
8070f5c0 | 2224 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2225 | #endif |
8070f5c0 MD |
2226 | field->name); |
2227 | break; | |
2228 | case atype_enum: | |
141ddf28 | 2229 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2230 | break; |
2231 | case atype_array: | |
3834b99f | 2232 | case atype_array_bitfield: |
8070f5c0 MD |
2233 | { |
2234 | const struct lttng_basic_type *elem_type; | |
2235 | ||
2236 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2237 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2238 | ret = print_tabs(session, nesting); |
2239 | if (ret) | |
2240 | return ret; | |
43803cf2 | 2241 | ret = lttng_metadata_printf(session, |
f513b2bf | 2242 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2243 | field->type.u.array.elem_alignment * CHAR_BIT, |
2244 | field->name); | |
2245 | if (ret) | |
2246 | return ret; | |
2247 | } | |
f513b2bf MD |
2248 | ret = print_tabs(session, nesting); |
2249 | if (ret) | |
2250 | return ret; | |
8070f5c0 | 2251 | ret = lttng_metadata_printf(session, |
f513b2bf | 2252 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2253 | elem_type->u.basic.integer.size, |
2254 | elem_type->u.basic.integer.alignment, | |
2255 | elem_type->u.basic.integer.signedness, | |
2256 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2257 | ? "none" | |
2258 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2259 | ? "UTF8" | |
2260 | : "ASCII", | |
2261 | elem_type->u.basic.integer.base, | |
5214fa50 | 2262 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2263 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2264 | #else |
8070f5c0 | 2265 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2266 | #endif |
8070f5c0 MD |
2267 | field->name, field->type.u.array.length); |
2268 | break; | |
2269 | } | |
2270 | case atype_sequence: | |
3834b99f | 2271 | case atype_sequence_bitfield: |
8070f5c0 MD |
2272 | { |
2273 | const struct lttng_basic_type *elem_type; | |
2274 | const struct lttng_basic_type *length_type; | |
2275 | ||
2276 | elem_type = &field->type.u.sequence.elem_type; | |
2277 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2278 | ret = print_tabs(session, nesting); |
2279 | if (ret) | |
2280 | return ret; | |
8070f5c0 | 2281 | ret = lttng_metadata_printf(session, |
f513b2bf | 2282 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2283 | length_type->u.basic.integer.size, |
32257272 | 2284 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2285 | length_type->u.basic.integer.signedness, |
2286 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2287 | ? "none" | |
0635cdd4 | 2288 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2289 | ? "UTF8" |
0635cdd4 | 2290 | : "ASCII"), |
8070f5c0 | 2291 | length_type->u.basic.integer.base, |
5214fa50 | 2292 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2293 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2294 | #else |
0635cdd4 | 2295 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2296 | #endif |
27d2368e MD |
2297 | field->name); |
2298 | if (ret) | |
2299 | return ret; | |
2300 | ||
43803cf2 | 2301 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2302 | ret = print_tabs(session, nesting); |
2303 | if (ret) | |
2304 | return ret; | |
43803cf2 | 2305 | ret = lttng_metadata_printf(session, |
f513b2bf | 2306 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2307 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2308 | field->name); | |
2309 | if (ret) | |
2310 | return ret; | |
2311 | } | |
f513b2bf MD |
2312 | ret = print_tabs(session, nesting); |
2313 | if (ret) | |
2314 | return ret; | |
27d2368e | 2315 | ret = lttng_metadata_printf(session, |
f513b2bf | 2316 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2317 | elem_type->u.basic.integer.size, |
32257272 | 2318 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2319 | elem_type->u.basic.integer.signedness, |
2320 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2321 | ? "none" | |
0635cdd4 | 2322 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2323 | ? "UTF8" |
0635cdd4 | 2324 | : "ASCII"), |
8070f5c0 | 2325 | elem_type->u.basic.integer.base, |
5214fa50 | 2326 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2327 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2328 | #else |
8070f5c0 | 2329 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2330 | #endif |
8070f5c0 | 2331 | field->name, |
27d2368e | 2332 | field->name); |
8070f5c0 MD |
2333 | break; |
2334 | } | |
c099397a | 2335 | |
8070f5c0 MD |
2336 | case atype_string: |
2337 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2338 | ret = print_tabs(session, nesting); |
2339 | if (ret) | |
2340 | return ret; | |
8070f5c0 | 2341 | ret = lttng_metadata_printf(session, |
f513b2bf | 2342 | "string%s _%s;\n", |
8070f5c0 MD |
2343 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2344 | " { encoding = ASCII; }" : "", | |
2345 | field->name); | |
2346 | break; | |
f513b2bf MD |
2347 | case atype_struct: |
2348 | ret = _lttng_struct_statedump(session, field, nesting); | |
2349 | break; | |
2350 | case atype_array_compound: | |
2351 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2352 | break; | |
2353 | case atype_sequence_compound: | |
2354 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2355 | break; | |
65c85aa6 MD |
2356 | case atype_variant: |
2357 | ret = _lttng_variant_statedump(session, field, nesting); | |
2358 | break; | |
f513b2bf | 2359 | |
8070f5c0 MD |
2360 | default: |
2361 | WARN_ON_ONCE(1); | |
2362 | return -EINVAL; | |
2363 | } | |
2364 | return ret; | |
2365 | } | |
2366 | ||
2367 | static | |
a90917c3 | 2368 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2369 | struct lttng_ctx *ctx) |
2370 | { | |
2371 | int ret = 0; | |
2372 | int i; | |
2373 | ||
2374 | if (!ctx) | |
2375 | return 0; | |
2376 | for (i = 0; i < ctx->nr_fields; i++) { | |
2377 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2378 | ||
f513b2bf | 2379 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2380 | if (ret) |
2381 | return ret; | |
2382 | } | |
2383 | return ret; | |
2384 | } | |
2385 | ||
2386 | static | |
a90917c3 MD |
2387 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2388 | struct lttng_event *event) | |
8070f5c0 MD |
2389 | { |
2390 | const struct lttng_event_desc *desc = event->desc; | |
2391 | int ret = 0; | |
2392 | int i; | |
2393 | ||
2394 | for (i = 0; i < desc->nr_fields; i++) { | |
2395 | const struct lttng_event_field *field = &desc->fields[i]; | |
2396 | ||
f513b2bf | 2397 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2398 | if (ret) |
2399 | return ret; | |
c099397a MD |
2400 | } |
2401 | return ret; | |
2402 | } | |
2403 | ||
d83004aa JD |
2404 | /* |
2405 | * Must be called with sessions_mutex held. | |
122c63cb MD |
2406 | * The entire event metadata is printed as a single atomic metadata |
2407 | * transaction. | |
d83004aa | 2408 | */ |
c099397a | 2409 | static |
a90917c3 MD |
2410 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2411 | struct lttng_channel *chan, | |
2412 | struct lttng_event *event) | |
c099397a MD |
2413 | { |
2414 | int ret = 0; | |
2415 | ||
57ccbfa6 | 2416 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2417 | return 0; |
d83004aa | 2418 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2419 | return 0; |
2420 | ||
122c63cb MD |
2421 | lttng_metadata_begin(session); |
2422 | ||
c099397a MD |
2423 | ret = lttng_metadata_printf(session, |
2424 | "event {\n" | |
ae734547 | 2425 | " name = \"%s\";\n" |
c099397a | 2426 | " id = %u;\n" |
b9074a1b | 2427 | " stream_id = %u;\n", |
c099397a MD |
2428 | event->desc->name, |
2429 | event->id, | |
2430 | event->chan->id); | |
2431 | if (ret) | |
2432 | goto end; | |
2433 | ||
b9074a1b MD |
2434 | if (event->ctx) { |
2435 | ret = lttng_metadata_printf(session, | |
2436 | " context := struct {\n"); | |
2437 | if (ret) | |
2438 | goto end; | |
2439 | } | |
a90917c3 | 2440 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2441 | if (ret) |
2442 | goto end; | |
b9074a1b MD |
2443 | if (event->ctx) { |
2444 | ret = lttng_metadata_printf(session, | |
2445 | " };\n"); | |
2446 | if (ret) | |
2447 | goto end; | |
2448 | } | |
8070f5c0 MD |
2449 | |
2450 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2451 | " fields := struct {\n" |
2452 | ); | |
2453 | if (ret) | |
2454 | goto end; | |
2455 | ||
a90917c3 | 2456 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2457 | if (ret) |
2458 | goto end; | |
2459 | ||
2460 | /* | |
2461 | * LTTng space reservation can only reserve multiples of the | |
2462 | * byte size. | |
2463 | */ | |
2464 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2465 | " };\n" |
2466 | "};\n\n"); | |
c099397a MD |
2467 | if (ret) |
2468 | goto end; | |
2469 | ||
c099397a MD |
2470 | event->metadata_dumped = 1; |
2471 | end: | |
122c63cb | 2472 | lttng_metadata_end(session); |
c099397a MD |
2473 | return ret; |
2474 | ||
2475 | } | |
2476 | ||
d83004aa JD |
2477 | /* |
2478 | * Must be called with sessions_mutex held. | |
122c63cb MD |
2479 | * The entire channel metadata is printed as a single atomic metadata |
2480 | * transaction. | |
d83004aa | 2481 | */ |
c099397a | 2482 | static |
a90917c3 MD |
2483 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2484 | struct lttng_channel *chan) | |
c099397a MD |
2485 | { |
2486 | int ret = 0; | |
2487 | ||
57ccbfa6 | 2488 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2489 | return 0; |
d83004aa JD |
2490 | |
2491 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2492 | return 0; |
2493 | ||
122c63cb MD |
2494 | lttng_metadata_begin(session); |
2495 | ||
c099397a MD |
2496 | WARN_ON_ONCE(!chan->header_type); |
2497 | ret = lttng_metadata_printf(session, | |
2498 | "stream {\n" | |
2499 | " id = %u;\n" | |
9115fbdc | 2500 | " event.header := %s;\n" |
b9074a1b | 2501 | " packet.context := struct packet_context;\n", |
c099397a MD |
2502 | chan->id, |
2503 | chan->header_type == 1 ? "struct event_header_compact" : | |
2504 | "struct event_header_large"); | |
2505 | if (ret) | |
2506 | goto end; | |
2507 | ||
b9074a1b MD |
2508 | if (chan->ctx) { |
2509 | ret = lttng_metadata_printf(session, | |
2510 | " event.context := struct {\n"); | |
2511 | if (ret) | |
2512 | goto end; | |
2513 | } | |
a90917c3 | 2514 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2515 | if (ret) |
2516 | goto end; | |
b9074a1b MD |
2517 | if (chan->ctx) { |
2518 | ret = lttng_metadata_printf(session, | |
2519 | " };\n"); | |
2520 | if (ret) | |
2521 | goto end; | |
2522 | } | |
8070f5c0 MD |
2523 | |
2524 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2525 | "};\n\n"); |
8070f5c0 | 2526 | |
c099397a MD |
2527 | chan->metadata_dumped = 1; |
2528 | end: | |
122c63cb | 2529 | lttng_metadata_end(session); |
c099397a MD |
2530 | return ret; |
2531 | } | |
2532 | ||
d83004aa JD |
2533 | /* |
2534 | * Must be called with sessions_mutex held. | |
2535 | */ | |
9115fbdc | 2536 | static |
a90917c3 | 2537 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2538 | { |
2539 | return lttng_metadata_printf(session, | |
2540 | "struct packet_context {\n" | |
a3ccff4f MD |
2541 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2542 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2543 | " uint64_t content_size;\n" |
2544 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2545 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2546 | " unsigned long events_discarded;\n" |
9115fbdc | 2547 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2548 | "};\n\n" |
9115fbdc MD |
2549 | ); |
2550 | } | |
2551 | ||
2552 | /* | |
2553 | * Compact header: | |
2554 | * id: range: 0 - 30. | |
2555 | * id 31 is reserved to indicate an extended header. | |
2556 | * | |
2557 | * Large header: | |
2558 | * id: range: 0 - 65534. | |
2559 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2560 | * |
2561 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2562 | */ |
2563 | static | |
a90917c3 | 2564 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2565 | { |
2566 | return lttng_metadata_printf(session, | |
2567 | "struct event_header_compact {\n" | |
2568 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2569 | " variant <id> {\n" | |
2570 | " struct {\n" | |
a3ccff4f | 2571 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2572 | " } compact;\n" |
2573 | " struct {\n" | |
2574 | " uint32_t id;\n" | |
a3ccff4f | 2575 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2576 | " } extended;\n" |
2577 | " } v;\n" | |
2578 | "} align(%u);\n" | |
2579 | "\n" | |
2580 | "struct event_header_large {\n" | |
2581 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2582 | " variant <id> {\n" | |
2583 | " struct {\n" | |
a3ccff4f | 2584 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2585 | " } compact;\n" |
2586 | " struct {\n" | |
2587 | " uint32_t id;\n" | |
a3ccff4f | 2588 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2589 | " } extended;\n" |
2590 | " } v;\n" | |
2591 | "} align(%u);\n\n", | |
a90917c3 MD |
2592 | lttng_alignof(uint32_t) * CHAR_BIT, |
2593 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2594 | ); |
2595 | } | |
2596 | ||
a3ccff4f MD |
2597 | /* |
2598 | * Approximation of NTP time of day to clock monotonic correlation, | |
2599 | * taken at start of trace. | |
2600 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2601 | * in future versions. | |
5283350b MD |
2602 | * This function may return a negative offset. It may happen if the |
2603 | * system sets the REALTIME clock to 0 after boot. | |
72dc372e MJ |
2604 | * |
2605 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2606 | * y2038 compliant. | |
a3ccff4f MD |
2607 | */ |
2608 | static | |
8967b2a3 | 2609 | int64_t measure_clock_offset(void) |
a3ccff4f | 2610 | { |
dcb93448 | 2611 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2612 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2613 | int64_t offset; |
a3ccff4f | 2614 | unsigned long flags; |
72dc372e MJ |
2615 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2616 | struct timespec64 rts = { 0, 0 }; | |
2617 | #else | |
2618 | struct timespec rts = { 0, 0 }; | |
2619 | #endif | |
a3ccff4f MD |
2620 | |
2621 | /* Disable interrupts to increase correlation precision. */ | |
2622 | local_irq_save(flags); | |
2623 | monotonic[0] = trace_clock_read64(); | |
72dc372e MJ |
2624 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2625 | ktime_get_real_ts64(&rts); | |
2626 | #else | |
216b6baa | 2627 | getnstimeofday(&rts); |
72dc372e | 2628 | #endif |
a3ccff4f MD |
2629 | monotonic[1] = trace_clock_read64(); |
2630 | local_irq_restore(flags); | |
2631 | ||
dcb93448 | 2632 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2633 | realtime = (uint64_t) rts.tv_sec * tcf; |
2634 | if (tcf == NSEC_PER_SEC) { | |
2635 | realtime += rts.tv_nsec; | |
2636 | } else { | |
2637 | uint64_t n = rts.tv_nsec * tcf; | |
2638 | ||
2639 | do_div(n, NSEC_PER_SEC); | |
2640 | realtime += n; | |
2641 | } | |
dcb93448 | 2642 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2643 | return offset; |
2644 | } | |
2645 | ||
3eb95be4 JR |
2646 | static |
2647 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2648 | { | |
ae457be2 | 2649 | int ret = 0; |
3eb95be4 JR |
2650 | size_t i; |
2651 | char cur; | |
2652 | ||
2653 | i = 0; | |
2654 | cur = string[i]; | |
2655 | while (cur != '\0') { | |
2656 | switch (cur) { | |
2657 | case '\n': | |
2658 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2659 | break; | |
2660 | case '\\': | |
2661 | case '"': | |
2662 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2663 | if (ret) | |
2664 | goto error; | |
2665 | /* We still print the current char */ | |
1d00109f | 2666 | lttng_fallthrough; |
3eb95be4 JR |
2667 | default: |
2668 | ret = lttng_metadata_printf(session, "%c", cur); | |
2669 | break; | |
2670 | } | |
2671 | ||
2672 | if (ret) | |
2673 | goto error; | |
2674 | ||
2675 | cur = string[++i]; | |
2676 | } | |
2677 | error: | |
2678 | return ret; | |
2679 | } | |
2680 | ||
2681 | static | |
1c88f269 JR |
2682 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2683 | const char *field_value) | |
3eb95be4 JR |
2684 | { |
2685 | int ret; | |
2686 | ||
1c88f269 | 2687 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2688 | if (ret) |
2689 | goto error; | |
2690 | ||
1c88f269 | 2691 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2692 | if (ret) |
2693 | goto error; | |
2694 | ||
2695 | ret = lttng_metadata_printf(session, "\";\n"); | |
2696 | ||
2697 | error: | |
2698 | return ret; | |
2699 | } | |
2700 | ||
c099397a MD |
2701 | /* |
2702 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2703 | * Must be called with sessions_mutex held. |
c099397a MD |
2704 | */ |
2705 | static | |
a90917c3 | 2706 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2707 | { |
30bdb6e4 | 2708 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2709 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2710 | const char *product_uuid; |
a90917c3 MD |
2711 | struct lttng_channel *chan; |
2712 | struct lttng_event *event; | |
c099397a MD |
2713 | int ret = 0; |
2714 | ||
57ccbfa6 | 2715 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 2716 | return 0; |
122c63cb MD |
2717 | |
2718 | lttng_metadata_begin(session); | |
2719 | ||
c099397a MD |
2720 | if (session->metadata_dumped) |
2721 | goto skip_session; | |
c099397a | 2722 | |
d793d5e1 | 2723 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2724 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2725 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2726 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2727 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2728 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2729 | |
2730 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2731 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2732 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2733 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2734 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2735 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2736 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2737 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2738 | "\n" |
2739 | "trace {\n" | |
2740 | " major = %u;\n" | |
2741 | " minor = %u;\n" | |
30bdb6e4 | 2742 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2743 | " byte_order = %s;\n" |
2744 | " packet.header := struct {\n" | |
2745 | " uint32_t magic;\n" | |
1ec3f75a | 2746 | " uint8_t uuid[16];\n" |
d793d5e1 | 2747 | " uint32_t stream_id;\n" |
5594698f | 2748 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2749 | " };\n" |
d793d5e1 | 2750 | "};\n\n", |
a90917c3 MD |
2751 | lttng_alignof(uint8_t) * CHAR_BIT, |
2752 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2753 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2754 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2755 | sizeof(unsigned long) * CHAR_BIT, |
2756 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2757 | CTF_SPEC_MAJOR, |
2758 | CTF_SPEC_MINOR, | |
d793d5e1 | 2759 | uuid_s, |
5214fa50 | 2760 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2761 | "be" |
2762 | #else | |
2763 | "le" | |
2764 | #endif | |
2765 | ); | |
2766 | if (ret) | |
2767 | goto end; | |
2768 | ||
99dc9597 MD |
2769 | ret = lttng_metadata_printf(session, |
2770 | "env {\n" | |
a6058143 | 2771 | " hostname = \"%s\";\n" |
c6c9e10f | 2772 | " domain = \"kernel\";\n" |
99dc9597 | 2773 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2774 | " kernel_release = \"%s\";\n" |
2775 | " kernel_version = \"%s\";\n" | |
2776 | " tracer_name = \"lttng-modules\";\n" | |
2777 | " tracer_major = %d;\n" | |
2778 | " tracer_minor = %d;\n" | |
2779 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2780 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2781 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2782 | utsname()->sysname, |
2783 | utsname()->release, | |
c6c9e10f MD |
2784 | utsname()->version, |
2785 | LTTNG_MODULES_MAJOR_VERSION, | |
2786 | LTTNG_MODULES_MINOR_VERSION, | |
2787 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2788 | ); |
2789 | if (ret) | |
2790 | goto end; | |
2791 | ||
1c88f269 JR |
2792 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2793 | if (ret) | |
2794 | goto end; | |
2795 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2796 | session->creation_time); | |
3eb95be4 JR |
2797 | if (ret) |
2798 | goto end; | |
2799 | ||
c88f762e GB |
2800 | /* Add the product UUID to the 'env' section */ |
2801 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2802 | if (product_uuid) { | |
2803 | ret = lttng_metadata_printf(session, | |
2804 | " product_uuid = \"%s\";\n", | |
2805 | product_uuid | |
2806 | ); | |
2807 | if (ret) | |
2808 | goto end; | |
2809 | } | |
2810 | ||
2811 | /* Close the 'env' section */ | |
3eb95be4 JR |
2812 | ret = lttng_metadata_printf(session, "};\n\n"); |
2813 | if (ret) | |
2814 | goto end; | |
2815 | ||
a3ccff4f MD |
2816 | ret = lttng_metadata_printf(session, |
2817 | "clock {\n" | |
2754583e MD |
2818 | " name = \"%s\";\n", |
2819 | trace_clock_name() | |
a82c63f1 MD |
2820 | ); |
2821 | if (ret) | |
2822 | goto end; | |
2823 | ||
2824 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2825 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2826 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2827 | clock_uuid_s |
2828 | ); | |
2829 | if (ret) | |
2830 | goto end; | |
2831 | } | |
2832 | ||
2833 | ret = lttng_metadata_printf(session, | |
2754583e | 2834 | " description = \"%s\";\n" |
a3ccff4f MD |
2835 | " freq = %llu; /* Frequency, in Hz */\n" |
2836 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2837 | " offset = %lld;\n" |
a3ccff4f | 2838 | "};\n\n", |
2754583e | 2839 | trace_clock_description(), |
a3ccff4f | 2840 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2841 | (long long) measure_clock_offset() |
a3ccff4f MD |
2842 | ); |
2843 | if (ret) | |
2844 | goto end; | |
2845 | ||
2846 | ret = lttng_metadata_printf(session, | |
2847 | "typealias integer {\n" | |
2848 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2849 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2850 | "} := uint27_clock_monotonic_t;\n" |
2851 | "\n" | |
2852 | "typealias integer {\n" | |
2853 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2854 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2855 | "} := uint32_clock_monotonic_t;\n" |
2856 | "\n" | |
2857 | "typealias integer {\n" | |
2858 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2859 | " map = clock.%s.value;\n" |
a3ccff4f | 2860 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2861 | trace_clock_name(), |
a3ccff4f | 2862 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2863 | trace_clock_name(), |
2864 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2865 | trace_clock_name() | |
a3ccff4f MD |
2866 | ); |
2867 | if (ret) | |
2868 | goto end; | |
2869 | ||
a90917c3 | 2870 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2871 | if (ret) |
2872 | goto end; | |
2873 | ||
a90917c3 | 2874 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2875 | if (ret) |
2876 | goto end; | |
2877 | ||
c099397a MD |
2878 | skip_session: |
2879 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2880 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2881 | if (ret) |
2882 | goto end; | |
2883 | } | |
2884 | ||
2885 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2886 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2887 | if (ret) |
2888 | goto end; | |
2889 | } | |
2890 | session->metadata_dumped = 1; | |
2891 | end: | |
122c63cb | 2892 | lttng_metadata_end(session); |
c099397a MD |
2893 | return ret; |
2894 | } | |
2895 | ||
c0e31d2e | 2896 | /** |
a90917c3 | 2897 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2898 | * @transport: transport structure |
2899 | * | |
2900 | * Registers a transport which can be used as output to extract the data out of | |
2901 | * LTTng. The module calling this registration function must ensure that no | |
2902 | * trap-inducing code will be executed by the transport functions. E.g. | |
ea53823c | 2903 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 2904 | * is made visible to the transport function. This registration acts as a |
ea53823c | 2905 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
2906 | * after its registration must it synchronize the TLBs. |
2907 | */ | |
a90917c3 | 2908 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2909 | { |
2910 | /* | |
2911 | * Make sure no page fault can be triggered by the module about to be | |
2912 | * registered. We deal with this here so we don't have to call | |
ea53823c | 2913 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 2914 | */ |
ea53823c | 2915 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
2916 | |
2917 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2918 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2919 | mutex_unlock(&sessions_mutex); |
2920 | } | |
a90917c3 | 2921 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2922 | |
2923 | /** | |
a90917c3 | 2924 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2925 | * @transport: transport structure |
2926 | */ | |
a90917c3 | 2927 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2928 | { |
2929 | mutex_lock(&sessions_mutex); | |
2930 | list_del(&transport->node); | |
2931 | mutex_unlock(&sessions_mutex); | |
2932 | } | |
a90917c3 | 2933 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2934 | |
2d042821 | 2935 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2936 | |
2937 | enum cpuhp_state lttng_hp_prepare; | |
2938 | enum cpuhp_state lttng_hp_online; | |
2939 | ||
2940 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2941 | { | |
2942 | struct lttng_cpuhp_node *lttng_node; | |
2943 | ||
2944 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2945 | switch (lttng_node->component) { | |
2946 | case LTTNG_RING_BUFFER_FRONTEND: | |
2947 | return 0; | |
2948 | case LTTNG_RING_BUFFER_BACKEND: | |
2949 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2950 | case LTTNG_RING_BUFFER_ITER: | |
2951 | return 0; | |
2952 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2953 | return 0; | |
2954 | default: | |
2955 | return -EINVAL; | |
2956 | } | |
2957 | } | |
2958 | ||
2959 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2960 | { | |
2961 | struct lttng_cpuhp_node *lttng_node; | |
2962 | ||
2963 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2964 | switch (lttng_node->component) { | |
2965 | case LTTNG_RING_BUFFER_FRONTEND: | |
2966 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2967 | case LTTNG_RING_BUFFER_BACKEND: | |
2968 | return 0; | |
2969 | case LTTNG_RING_BUFFER_ITER: | |
2970 | return 0; | |
2971 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2972 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2973 | default: | |
2974 | return -EINVAL; | |
2975 | } | |
2976 | } | |
2977 | ||
2978 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2979 | { | |
2980 | struct lttng_cpuhp_node *lttng_node; | |
2981 | ||
2982 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2983 | switch (lttng_node->component) { | |
2984 | case LTTNG_RING_BUFFER_FRONTEND: | |
2985 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2986 | case LTTNG_RING_BUFFER_BACKEND: | |
2987 | return 0; | |
2988 | case LTTNG_RING_BUFFER_ITER: | |
2989 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2990 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2991 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2992 | default: | |
2993 | return -EINVAL; | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2998 | { | |
2999 | struct lttng_cpuhp_node *lttng_node; | |
3000 | ||
3001 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3002 | switch (lttng_node->component) { | |
3003 | case LTTNG_RING_BUFFER_FRONTEND: | |
3004 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3005 | case LTTNG_RING_BUFFER_BACKEND: | |
3006 | return 0; | |
3007 | case LTTNG_RING_BUFFER_ITER: | |
3008 | return 0; | |
3009 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3010 | return 0; | |
3011 | default: | |
3012 | return -EINVAL; | |
3013 | } | |
3014 | } | |
3015 | ||
3016 | static int __init lttng_init_cpu_hotplug(void) | |
3017 | { | |
3018 | int ret; | |
3019 | ||
3020 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3021 | lttng_hotplug_prepare, | |
3022 | lttng_hotplug_dead); | |
3023 | if (ret < 0) { | |
3024 | return ret; | |
3025 | } | |
3026 | lttng_hp_prepare = ret; | |
3027 | lttng_rb_set_hp_prepare(ret); | |
3028 | ||
3029 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3030 | lttng_hotplug_online, | |
3031 | lttng_hotplug_offline); | |
3032 | if (ret < 0) { | |
3033 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3034 | lttng_hp_prepare = 0; | |
3035 | return ret; | |
3036 | } | |
3037 | lttng_hp_online = ret; | |
3038 | lttng_rb_set_hp_online(ret); | |
3039 | ||
3040 | return 0; | |
3041 | } | |
3042 | ||
3043 | static void __exit lttng_exit_cpu_hotplug(void) | |
3044 | { | |
3045 | lttng_rb_set_hp_online(0); | |
3046 | cpuhp_remove_multi_state(lttng_hp_online); | |
3047 | lttng_rb_set_hp_prepare(0); | |
3048 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3049 | } | |
3050 | ||
2d042821 | 3051 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3052 | static int lttng_init_cpu_hotplug(void) |
3053 | { | |
3054 | return 0; | |
3055 | } | |
3056 | static void lttng_exit_cpu_hotplug(void) | |
3057 | { | |
3058 | } | |
2d042821 | 3059 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3060 | |
3061 | ||
a90917c3 | 3062 | static int __init lttng_events_init(void) |
4e3c1b9b | 3063 | { |
1c25284c MD |
3064 | int ret; |
3065 | ||
453b2495 JD |
3066 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3067 | if (ret) | |
3068 | return ret; | |
389d7070 | 3069 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3070 | if (ret) |
3071 | return ret; | |
3072 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3073 | if (ret) |
3074 | return ret; | |
3075 | ret = lttng_probes_init(); | |
389d7070 MD |
3076 | if (ret) |
3077 | return ret; | |
07dfc1d0 | 3078 | ret = lttng_context_init(); |
20591cf7 MD |
3079 | if (ret) |
3080 | return ret; | |
07dfc1d0 MD |
3081 | ret = lttng_tracepoint_init(); |
3082 | if (ret) | |
3083 | goto error_tp; | |
a90917c3 | 3084 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3085 | if (!event_cache) { |
3086 | ret = -ENOMEM; | |
3087 | goto error_kmem; | |
3088 | } | |
80996790 | 3089 | ret = lttng_abi_init(); |
02119ee5 MD |
3090 | if (ret) |
3091 | goto error_abi; | |
0c956676 MD |
3092 | ret = lttng_logger_init(); |
3093 | if (ret) | |
3094 | goto error_logger; | |
1e367326 MD |
3095 | ret = lttng_init_cpu_hotplug(); |
3096 | if (ret) | |
3097 | goto error_hotplug; | |
101215b7 | 3098 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3099 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3100 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3101 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3102 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3103 | LTTNG_VERSION_NAME, |
3104 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3105 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3106 | #else | |
3107 | "", | |
3108 | #endif | |
3109 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3110 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3111 | #else | |
3112 | ""); | |
3113 | #endif | |
5e22c27b MJ |
3114 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
3115 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
3116 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 3117 | return 0; |
0c956676 | 3118 | |
1e367326 MD |
3119 | error_hotplug: |
3120 | lttng_logger_exit(); | |
0c956676 MD |
3121 | error_logger: |
3122 | lttng_abi_exit(); | |
02119ee5 | 3123 | error_abi: |
1c25284c | 3124 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3125 | error_kmem: |
3126 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3127 | error_tp: |
3128 | lttng_context_exit(); | |
101215b7 | 3129 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3130 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3131 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3132 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3133 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3134 | LTTNG_VERSION_NAME, |
3135 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3136 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3137 | #else | |
3138 | "", | |
3139 | #endif | |
3140 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3141 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3142 | #else | |
3143 | ""); | |
3144 | #endif | |
1c25284c | 3145 | return ret; |
4e3c1b9b MD |
3146 | } |
3147 | ||
a90917c3 | 3148 | module_init(lttng_events_init); |
11b5a3c2 | 3149 | |
a90917c3 | 3150 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3151 | { |
a90917c3 | 3152 | struct lttng_session *session, *tmpsession; |
92e94819 | 3153 | |
1e367326 | 3154 | lttng_exit_cpu_hotplug(); |
0c956676 | 3155 | lttng_logger_exit(); |
80996790 | 3156 | lttng_abi_exit(); |
92e94819 | 3157 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3158 | lttng_session_destroy(session); |
11b5a3c2 | 3159 | kmem_cache_destroy(event_cache); |
20591cf7 | 3160 | lttng_tracepoint_exit(); |
07dfc1d0 | 3161 | lttng_context_exit(); |
101215b7 | 3162 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3163 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3164 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3165 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3166 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3167 | LTTNG_VERSION_NAME, |
3168 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3169 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3170 | #else | |
3171 | "", | |
3172 | #endif | |
3173 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3174 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3175 | #else | |
3176 | ""); | |
3177 | #endif | |
4e3c1b9b | 3178 | } |
92e94819 | 3179 | |
a90917c3 | 3180 | module_exit(lttng_events_exit); |
11b5a3c2 | 3181 | |
101215b7 MJ |
3182 | #include "extra_version/patches.i" |
3183 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3184 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3185 | #endif | |
3186 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3187 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3188 | #endif | |
92e94819 MD |
3189 | MODULE_LICENSE("GPL and additional rights"); |
3190 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3191 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3192 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3193 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3194 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3195 | LTTNG_MODULES_EXTRAVERSION); |