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