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> |
64af2437 MD |
44 | #include <wrapper/ringbuffer/backend.h> |
45 | #include <wrapper/ringbuffer/frontend.h> | |
72dc372e | 46 | #include <wrapper/time.h> |
4e3c1b9b | 47 | |
d83004aa JD |
48 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
49 | ||
4e3c1b9b | 50 | static LIST_HEAD(sessions); |
a90917c3 | 51 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
52 | /* |
53 | * Protect the sessions and metadata caches. | |
54 | */ | |
4e3c1b9b MD |
55 | static DEFINE_MUTEX(sessions_mutex); |
56 | static struct kmem_cache *event_cache; | |
57 | ||
3c997079 MD |
58 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
59 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
60 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
61 | ||
a90917c3 MD |
62 | static void _lttng_event_destroy(struct lttng_event *event); |
63 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
64 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 65 | static |
a90917c3 MD |
66 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
67 | struct lttng_channel *chan, | |
68 | struct lttng_event *event); | |
c099397a | 69 | static |
a90917c3 | 70 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
71 | static |
72 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
73 | static |
74 | int _lttng_field_statedump(struct lttng_session *session, | |
75 | const struct lttng_event_field *field, | |
76 | size_t nesting); | |
c099397a | 77 | |
c099397a | 78 | void synchronize_trace(void) |
abcca994 | 79 | { |
2d042821 | 80 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
81 | synchronize_rcu(); |
82 | #else | |
abcca994 | 83 | synchronize_sched(); |
92da05ce MJ |
84 | #endif |
85 | ||
2d042821 | 86 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
87 | #ifdef CONFIG_PREEMPT_RT_FULL |
88 | synchronize_rcu(); | |
89 | #endif | |
2d042821 | 90 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
91 | #ifdef CONFIG_PREEMPT_RT |
92 | synchronize_rcu(); | |
93 | #endif | |
2d042821 | 94 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
95 | } |
96 | ||
3c997079 MD |
97 | void lttng_lock_sessions(void) |
98 | { | |
99 | mutex_lock(&sessions_mutex); | |
100 | } | |
101 | ||
102 | void lttng_unlock_sessions(void) | |
103 | { | |
104 | mutex_unlock(&sessions_mutex); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Called with sessions lock held. | |
109 | */ | |
110 | int lttng_session_active(void) | |
111 | { | |
112 | struct lttng_session *iter; | |
113 | ||
114 | list_for_each_entry(iter, &sessions, list) { | |
115 | if (iter->active) | |
116 | return 1; | |
117 | } | |
118 | return 0; | |
119 | } | |
120 | ||
a90917c3 | 121 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 122 | { |
a90917c3 | 123 | struct lttng_session *session; |
d83004aa | 124 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 125 | int i; |
4e3c1b9b MD |
126 | |
127 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 128 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 129 | if (!session) |
d83004aa | 130 | goto err; |
4e3c1b9b | 131 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 132 | INIT_LIST_HEAD(&session->events); |
8b7bb83e | 133 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
134 | |
135 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
136 | GFP_KERNEL); | |
137 | if (!metadata_cache) | |
138 | goto err_free_session; | |
0ca42eb7 | 139 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
140 | if (!metadata_cache->data) |
141 | goto err_free_cache; | |
142 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
143 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 144 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
145 | session->metadata_cache = metadata_cache; |
146 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
147 | memcpy(&metadata_cache->uuid, &session->uuid, |
148 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
149 | INIT_LIST_HEAD(&session->enablers_head); |
150 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
151 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 152 | list_add(&session->list, &sessions); |
d1f652f8 MD |
153 | session->pid_tracker.session = session; |
154 | session->pid_tracker.tracker_type = TRACKER_PID; | |
155 | session->vpid_tracker.session = session; | |
156 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
157 | session->uid_tracker.session = session; | |
158 | session->uid_tracker.tracker_type = TRACKER_UID; | |
159 | session->vuid_tracker.session = session; | |
160 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
161 | session->gid_tracker.session = session; | |
162 | session->gid_tracker.tracker_type = TRACKER_GID; | |
163 | session->vgid_tracker.session = session; | |
164 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
165 | mutex_unlock(&sessions_mutex); |
166 | return session; | |
d83004aa JD |
167 | |
168 | err_free_cache: | |
169 | kfree(metadata_cache); | |
170 | err_free_session: | |
48f5e0b5 | 171 | lttng_kvfree(session); |
d83004aa JD |
172 | err: |
173 | mutex_unlock(&sessions_mutex); | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | void metadata_cache_destroy(struct kref *kref) | |
178 | { | |
179 | struct lttng_metadata_cache *cache = | |
180 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 181 | vfree(cache->data); |
d83004aa | 182 | kfree(cache); |
4e3c1b9b MD |
183 | } |
184 | ||
a90917c3 | 185 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 186 | { |
a90917c3 MD |
187 | struct lttng_channel *chan, *tmpchan; |
188 | struct lttng_event *event, *tmpevent; | |
d83004aa | 189 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 190 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 191 | int ret; |
4e3c1b9b MD |
192 | |
193 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 194 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
195 | list_for_each_entry(chan, &session->chan, list) { |
196 | ret = lttng_syscalls_unregister(chan); | |
197 | WARN_ON(ret); | |
198 | } | |
dda6a249 | 199 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 200 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
201 | WARN_ON(ret); |
202 | } | |
abcca994 | 203 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ad594e3a MD |
204 | list_for_each_entry(chan, &session->chan, list) { |
205 | ret = lttng_syscalls_destroy(chan); | |
206 | WARN_ON(ret); | |
207 | } | |
3c997079 MD |
208 | list_for_each_entry_safe(enabler, tmpenabler, |
209 | &session->enablers_head, node) | |
210 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 211 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 212 | _lttng_event_destroy(event); |
d83004aa JD |
213 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
214 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 215 | _lttng_channel_destroy(chan); |
d83004aa | 216 | } |
5a4afa8a | 217 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
218 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
219 | _lttng_metadata_channel_hangup(metadata_stream); | |
5a4afa8a | 220 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
221 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
222 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
223 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
224 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
225 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
226 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 227 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
228 | list_del(&session->list); |
229 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 230 | lttng_kvfree(session); |
4e3c1b9b MD |
231 | } |
232 | ||
601252cf MD |
233 | int lttng_session_statedump(struct lttng_session *session) |
234 | { | |
235 | int ret; | |
236 | ||
237 | mutex_lock(&sessions_mutex); | |
238 | ret = lttng_statedump_start(session); | |
239 | mutex_unlock(&sessions_mutex); | |
240 | return ret; | |
241 | } | |
242 | ||
a90917c3 | 243 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
244 | { |
245 | int ret = 0; | |
a90917c3 | 246 | struct lttng_channel *chan; |
c0e31d2e MD |
247 | |
248 | mutex_lock(&sessions_mutex); | |
249 | if (session->active) { | |
250 | ret = -EBUSY; | |
251 | goto end; | |
252 | } | |
c099397a | 253 | |
3c997079 MD |
254 | /* Set transient enabler state to "enabled" */ |
255 | session->tstate = 1; | |
256 | ||
4ef81e4a MD |
257 | /* We need to sync enablers with session before activation. */ |
258 | lttng_session_sync_enablers(session); | |
259 | ||
c099397a MD |
260 | /* |
261 | * Snapshot the number of events per channel to know the type of header | |
262 | * we need to use. | |
263 | */ | |
264 | list_for_each_entry(chan, &session->chan, list) { | |
265 | if (chan->header_type) | |
266 | continue; /* don't change it if session stop/restart */ | |
267 | if (chan->free_event_id < 31) | |
268 | chan->header_type = 1; /* compact */ | |
269 | else | |
270 | chan->header_type = 2; /* large */ | |
271 | } | |
272 | ||
64af2437 | 273 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
274 | list_for_each_entry(chan, &session->chan, list) { |
275 | if (chan->channel_type != METADATA_CHANNEL) | |
276 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
277 | } | |
64af2437 | 278 | |
a8f2d0c7 MJ |
279 | WRITE_ONCE(session->active, 1); |
280 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 281 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 282 | if (ret) { |
a8f2d0c7 | 283 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
284 | goto end; |
285 | } | |
286 | ret = lttng_statedump_start(session); | |
360f38ea | 287 | if (ret) |
a8f2d0c7 | 288 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
289 | end: |
290 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 291 | return ret; |
c0e31d2e MD |
292 | } |
293 | ||
a90917c3 | 294 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
295 | { |
296 | int ret = 0; | |
64af2437 | 297 | struct lttng_channel *chan; |
c0e31d2e MD |
298 | |
299 | mutex_lock(&sessions_mutex); | |
300 | if (!session->active) { | |
301 | ret = -EBUSY; | |
302 | goto end; | |
303 | } | |
a8f2d0c7 | 304 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
305 | |
306 | /* Set transient enabler state to "disabled" */ | |
307 | session->tstate = 0; | |
308 | lttng_session_sync_enablers(session); | |
64af2437 MD |
309 | |
310 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
311 | list_for_each_entry(chan, &session->chan, list) { |
312 | if (chan->channel_type != METADATA_CHANNEL) | |
313 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
314 | } | |
c0e31d2e MD |
315 | end: |
316 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 317 | return ret; |
c0e31d2e MD |
318 | } |
319 | ||
9616f0bf JD |
320 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
321 | { | |
322 | int ret = 0; | |
323 | struct lttng_channel *chan; | |
324 | struct lttng_event *event; | |
325 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
326 | struct lttng_metadata_stream *stream; | |
327 | ||
328 | mutex_lock(&sessions_mutex); | |
329 | if (!session->active) { | |
330 | ret = -EBUSY; | |
331 | goto end; | |
332 | } | |
333 | ||
334 | mutex_lock(&cache->lock); | |
335 | memset(cache->data, 0, cache->cache_alloc); | |
336 | cache->metadata_written = 0; | |
337 | cache->version++; | |
338 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
339 | stream->metadata_out = 0; | |
340 | stream->metadata_in = 0; | |
341 | } | |
342 | mutex_unlock(&cache->lock); | |
343 | ||
344 | session->metadata_dumped = 0; | |
345 | list_for_each_entry(chan, &session->chan, list) { | |
346 | chan->metadata_dumped = 0; | |
347 | } | |
348 | ||
349 | list_for_each_entry(event, &session->events, list) { | |
350 | event->metadata_dumped = 0; | |
351 | } | |
352 | ||
353 | ret = _lttng_session_metadata_statedump(session); | |
354 | ||
355 | end: | |
356 | mutex_unlock(&sessions_mutex); | |
357 | return ret; | |
358 | } | |
359 | ||
a90917c3 | 360 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 361 | { |
3c997079 | 362 | int ret = 0; |
e64957da | 363 | |
3c997079 MD |
364 | mutex_lock(&sessions_mutex); |
365 | if (channel->channel_type == METADATA_CHANNEL) { | |
366 | ret = -EPERM; | |
367 | goto end; | |
368 | } | |
369 | if (channel->enabled) { | |
370 | ret = -EEXIST; | |
371 | goto end; | |
372 | } | |
373 | /* Set transient enabler state to "enabled" */ | |
374 | channel->tstate = 1; | |
375 | lttng_session_sync_enablers(channel->session); | |
376 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 377 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
378 | end: |
379 | mutex_unlock(&sessions_mutex); | |
380 | return ret; | |
e64957da MD |
381 | } |
382 | ||
a90917c3 | 383 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 384 | { |
3c997079 | 385 | int ret = 0; |
e64957da | 386 | |
3c997079 MD |
387 | mutex_lock(&sessions_mutex); |
388 | if (channel->channel_type == METADATA_CHANNEL) { | |
389 | ret = -EPERM; | |
390 | goto end; | |
391 | } | |
392 | if (!channel->enabled) { | |
393 | ret = -EEXIST; | |
394 | goto end; | |
395 | } | |
396 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 397 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
398 | /* Set transient enabler state to "enabled" */ |
399 | channel->tstate = 0; | |
400 | lttng_session_sync_enablers(channel->session); | |
401 | end: | |
402 | mutex_unlock(&sessions_mutex); | |
403 | return ret; | |
e64957da MD |
404 | } |
405 | ||
a90917c3 | 406 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 407 | { |
3c997079 | 408 | int ret = 0; |
e64957da | 409 | |
3c997079 MD |
410 | mutex_lock(&sessions_mutex); |
411 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
412 | ret = -EPERM; | |
413 | goto end; | |
414 | } | |
415 | if (event->enabled) { | |
416 | ret = -EEXIST; | |
417 | goto end; | |
418 | } | |
a0493bef MD |
419 | switch (event->instrumentation) { |
420 | case LTTNG_KERNEL_TRACEPOINT: | |
421 | case LTTNG_KERNEL_SYSCALL: | |
422 | ret = -EINVAL; | |
423 | break; | |
424 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 425 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 426 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 427 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
428 | break; |
429 | case LTTNG_KERNEL_KRETPROBE: | |
430 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
431 | break; | |
2bf9218e | 432 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
433 | default: |
434 | WARN_ON_ONCE(1); | |
435 | ret = -EINVAL; | |
436 | } | |
3c997079 MD |
437 | end: |
438 | mutex_unlock(&sessions_mutex); | |
439 | return ret; | |
e64957da MD |
440 | } |
441 | ||
a90917c3 | 442 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 443 | { |
3c997079 | 444 | int ret = 0; |
e64957da | 445 | |
3c997079 MD |
446 | mutex_lock(&sessions_mutex); |
447 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
448 | ret = -EPERM; | |
449 | goto end; | |
450 | } | |
451 | if (!event->enabled) { | |
452 | ret = -EEXIST; | |
453 | goto end; | |
454 | } | |
a0493bef MD |
455 | switch (event->instrumentation) { |
456 | case LTTNG_KERNEL_TRACEPOINT: | |
457 | case LTTNG_KERNEL_SYSCALL: | |
458 | ret = -EINVAL; | |
459 | break; | |
460 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 461 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 462 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 463 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
464 | break; |
465 | case LTTNG_KERNEL_KRETPROBE: | |
466 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
467 | break; | |
2bf9218e | 468 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
469 | default: |
470 | WARN_ON_ONCE(1); | |
471 | ret = -EINVAL; | |
472 | } | |
3c997079 MD |
473 | end: |
474 | mutex_unlock(&sessions_mutex); | |
475 | return ret; | |
e64957da MD |
476 | } |
477 | ||
a90917c3 | 478 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 479 | { |
a90917c3 | 480 | struct lttng_transport *transport; |
f3d01b96 | 481 | |
a90917c3 | 482 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
483 | if (!strcmp(transport->name, name)) |
484 | return transport; | |
485 | } | |
486 | return NULL; | |
487 | } | |
488 | ||
a90917c3 | 489 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
490 | const char *transport_name, |
491 | void *buf_addr, | |
4e3c1b9b MD |
492 | size_t subbuf_size, size_t num_subbuf, |
493 | unsigned int switch_timer_interval, | |
d83004aa JD |
494 | unsigned int read_timer_interval, |
495 | enum channel_type channel_type) | |
4e3c1b9b | 496 | { |
a90917c3 MD |
497 | struct lttng_channel *chan; |
498 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
499 | |
500 | mutex_lock(&sessions_mutex); | |
d83004aa | 501 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 502 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 503 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
504 | if (!transport) { |
505 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
506 | transport_name); | |
c0e31d2e | 507 | goto notransport; |
f3d01b96 | 508 | } |
a33c9927 MD |
509 | if (!try_module_get(transport->owner)) { |
510 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
511 | goto notransport; | |
512 | } | |
a90917c3 | 513 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 514 | if (!chan) |
c0e31d2e | 515 | goto nomem; |
4e3c1b9b | 516 | chan->session = session; |
05d32c64 | 517 | chan->id = session->free_chan_id++; |
3b731ab1 | 518 | chan->ops = &transport->ops; |
125b4df4 MD |
519 | /* |
520 | * Note: the channel creation op already writes into the packet | |
521 | * headers. Therefore the "chan" information used as input | |
522 | * should be already accessible. | |
523 | */ | |
5f5ddf01 MD |
524 | chan->chan = transport->ops.channel_create(transport_name, |
525 | chan, buf_addr, subbuf_size, num_subbuf, | |
526 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
527 | if (!chan->chan) |
528 | goto create_error; | |
3c997079 | 529 | chan->tstate = 1; |
e64957da | 530 | chan->enabled = 1; |
a33c9927 | 531 | chan->transport = transport; |
d83004aa | 532 | chan->channel_type = channel_type; |
4e3c1b9b MD |
533 | list_add(&chan->list, &session->chan); |
534 | mutex_unlock(&sessions_mutex); | |
535 | return chan; | |
536 | ||
f3d01b96 MD |
537 | create_error: |
538 | kfree(chan); | |
c0e31d2e | 539 | nomem: |
a33c9927 MD |
540 | if (transport) |
541 | module_put(transport->owner); | |
c0e31d2e | 542 | notransport: |
e5382b6d | 543 | active: |
4e3c1b9b MD |
544 | mutex_unlock(&sessions_mutex); |
545 | return NULL; | |
546 | } | |
547 | ||
548 | /* | |
d83004aa JD |
549 | * Only used internally at session destruction for per-cpu channels, and |
550 | * when metadata channel is released. | |
551 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 552 | */ |
aa7c23a9 | 553 | static |
a90917c3 | 554 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 555 | { |
11b5a3c2 | 556 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 557 | module_put(chan->transport->owner); |
4e3c1b9b | 558 | list_del(&chan->list); |
8070f5c0 | 559 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
560 | kfree(chan); |
561 | } | |
562 | ||
d83004aa JD |
563 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
564 | { | |
565 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
566 | ||
567 | /* Protect the metadata cache with the sessions_mutex. */ | |
568 | mutex_lock(&sessions_mutex); | |
569 | _lttng_channel_destroy(chan); | |
570 | mutex_unlock(&sessions_mutex); | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
573 | ||
574 | static | |
575 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
576 | { | |
577 | stream->finalized = 1; | |
578 | wake_up_interruptible(&stream->read_wait); | |
579 | } | |
580 | ||
e5382b6d MD |
581 | /* |
582 | * Supports event creation while tracing session is active. | |
3c997079 | 583 | * Needs to be called with sessions mutex held. |
e5382b6d | 584 | */ |
3c997079 MD |
585 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
586 | struct lttng_kernel_event *event_param, | |
587 | void *filter, | |
588 | const struct lttng_event_desc *event_desc, | |
589 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 590 | { |
3c997079 | 591 | struct lttng_session *session = chan->session; |
a90917c3 | 592 | struct lttng_event *event; |
3c997079 MD |
593 | const char *event_name; |
594 | struct hlist_head *head; | |
595 | size_t name_len; | |
596 | uint32_t hash; | |
3d084699 | 597 | int ret; |
4e3c1b9b | 598 | |
abc0446a | 599 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 600 | ret = -EMFILE; |
e5382b6d | 601 | goto full; |
abc0446a | 602 | } |
3c997079 MD |
603 | |
604 | switch (itype) { | |
605 | case LTTNG_KERNEL_TRACEPOINT: | |
606 | event_name = event_desc->name; | |
607 | break; | |
608 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 609 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 610 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 611 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 612 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
613 | event_name = event_param->name; |
614 | break; | |
2bf9218e | 615 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
616 | default: |
617 | WARN_ON_ONCE(1); | |
618 | ret = -EINVAL; | |
619 | goto type_error; | |
620 | } | |
621 | name_len = strlen(event_name); | |
622 | hash = jhash(event_name, name_len, 0); | |
623 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 624 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
625 | WARN_ON_ONCE(!event->desc); |
626 | if (!strncmp(event->desc->name, event_name, | |
627 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
628 | && chan == event->chan) { | |
629 | ret = -EEXIST; | |
630 | goto exist; | |
abc0446a MD |
631 | } |
632 | } | |
3c997079 | 633 | |
11b5a3c2 | 634 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 635 | if (!event) { |
4cf0bf51 | 636 | ret = -ENOMEM; |
4e3c1b9b | 637 | goto cache_error; |
abc0446a | 638 | } |
4e3c1b9b MD |
639 | event->chan = chan; |
640 | event->filter = filter; | |
e5382b6d | 641 | event->id = chan->free_event_id++; |
3c997079 MD |
642 | event->instrumentation = itype; |
643 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 644 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
645 | INIT_LIST_HEAD(&event->enablers_ref_head); |
646 | ||
647 | switch (itype) { | |
ab2277d6 | 648 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
649 | /* Event will be enabled by enabler sync. */ |
650 | event->enabled = 0; | |
651 | event->registered = 0; | |
652 | event->desc = lttng_event_get(event_name); | |
abc0446a | 653 | if (!event->desc) { |
4cf0bf51 | 654 | ret = -ENOENT; |
d3dbe23c | 655 | goto register_error; |
abc0446a | 656 | } |
3c997079 MD |
657 | /* Populate lttng_event structure before event registration. */ |
658 | smp_wmb(); | |
baf20995 | 659 | break; |
ab2277d6 | 660 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
661 | /* |
662 | * Needs to be explicitly enabled after creation, since | |
663 | * we may want to apply filters. | |
664 | */ | |
665 | event->enabled = 0; | |
3c997079 MD |
666 | event->registered = 1; |
667 | /* | |
668 | * Populate lttng_event structure before event | |
669 | * registration. | |
670 | */ | |
671 | smp_wmb(); | |
672 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
673 | event_param->u.kprobe.symbol_name, |
674 | event_param->u.kprobe.offset, | |
675 | event_param->u.kprobe.addr, | |
676 | event); | |
abc0446a | 677 | if (ret) { |
4cf0bf51 | 678 | ret = -EINVAL; |
d6d808f3 | 679 | goto register_error; |
abc0446a | 680 | } |
edeb3137 MD |
681 | ret = try_module_get(event->desc->owner); |
682 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 683 | break; |
7371f44c MD |
684 | case LTTNG_KERNEL_KRETPROBE: |
685 | { | |
a90917c3 | 686 | struct lttng_event *event_return; |
7371f44c MD |
687 | |
688 | /* kretprobe defines 2 events */ | |
a0493bef MD |
689 | /* |
690 | * Needs to be explicitly enabled after creation, since | |
691 | * we may want to apply filters. | |
692 | */ | |
693 | event->enabled = 0; | |
3c997079 | 694 | event->registered = 1; |
7371f44c MD |
695 | event_return = |
696 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 697 | if (!event_return) { |
4cf0bf51 | 698 | ret = -ENOMEM; |
7371f44c | 699 | goto register_error; |
abc0446a | 700 | } |
7371f44c MD |
701 | event_return->chan = chan; |
702 | event_return->filter = filter; | |
703 | event_return->id = chan->free_event_id++; | |
a0493bef | 704 | event_return->enabled = 0; |
3c997079 MD |
705 | event_return->registered = 1; |
706 | event_return->instrumentation = itype; | |
7371f44c | 707 | /* |
a90917c3 | 708 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
709 | */ |
710 | smp_wmb(); | |
3c997079 | 711 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
712 | event_param->u.kretprobe.symbol_name, |
713 | event_param->u.kretprobe.offset, | |
714 | event_param->u.kretprobe.addr, | |
715 | event, event_return); | |
716 | if (ret) { | |
717 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 718 | ret = -EINVAL; |
7371f44c MD |
719 | goto register_error; |
720 | } | |
721 | /* Take 2 refs on the module: one per event. */ | |
722 | ret = try_module_get(event->desc->owner); | |
723 | WARN_ON_ONCE(!ret); | |
724 | ret = try_module_get(event->desc->owner); | |
725 | WARN_ON_ONCE(!ret); | |
a90917c3 | 726 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 727 | event_return); |
abc0446a | 728 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
729 | if (ret) { |
730 | kmem_cache_free(event_cache, event_return); | |
731 | module_put(event->desc->owner); | |
732 | module_put(event->desc->owner); | |
733 | goto statedump_error; | |
734 | } | |
735 | list_add(&event_return->list, &chan->session->events); | |
736 | break; | |
737 | } | |
1ec65de1 | 738 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 739 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
740 | /* |
741 | * Needs to be explicitly enabled after creation, since | |
742 | * we may want to apply filters. | |
743 | */ | |
744 | event->enabled = 0; | |
3c997079 MD |
745 | event->registered = 0; |
746 | event->desc = event_desc; | |
ad594e3a MD |
747 | switch (event_param->u.syscall.entryexit) { |
748 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
749 | ret = -EINVAL; | |
750 | goto register_error; | |
751 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
752 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
753 | break; | |
754 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
755 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
756 | break; | |
757 | } | |
758 | switch (event_param->u.syscall.abi) { | |
759 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
760 | ret = -EINVAL; | |
761 | goto register_error; | |
762 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
763 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
764 | break; | |
765 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
766 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
767 | break; | |
768 | } | |
abc0446a | 769 | if (!event->desc) { |
4cf0bf51 | 770 | ret = -EINVAL; |
259b6cb3 | 771 | goto register_error; |
abc0446a | 772 | } |
1ec65de1 | 773 | break; |
149b9a9d | 774 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
775 | /* |
776 | * Needs to be explicitly enabled after creation, since | |
777 | * we may want to apply filters. | |
778 | */ | |
779 | event->enabled = 0; | |
780 | event->registered = 1; | |
3aed4dca | 781 | |
a344f64b FD |
782 | /* |
783 | * Populate lttng_event structure before event | |
784 | * registration. | |
785 | */ | |
786 | smp_wmb(); | |
149b9a9d YB |
787 | |
788 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 789 | event_param->u.uprobe.fd, |
149b9a9d YB |
790 | event); |
791 | if (ret) | |
792 | goto register_error; | |
793 | ret = try_module_get(event->desc->owner); | |
794 | WARN_ON_ONCE(!ret); | |
795 | break; | |
2bf9218e | 796 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
797 | default: |
798 | WARN_ON_ONCE(1); | |
4cf0bf51 | 799 | ret = -EINVAL; |
df07930b | 800 | goto register_error; |
baf20995 | 801 | } |
a90917c3 | 802 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
803 | WARN_ON_ONCE(ret > 0); |
804 | if (ret) { | |
c099397a | 805 | goto statedump_error; |
abc0446a | 806 | } |
3c997079 | 807 | hlist_add_head(&event->hlist, head); |
dda6a249 | 808 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
809 | return event; |
810 | ||
c099397a | 811 | statedump_error: |
259b6cb3 | 812 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 813 | register_error: |
11b5a3c2 | 814 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
815 | cache_error: |
816 | exist: | |
3c997079 | 817 | type_error: |
e5382b6d | 818 | full: |
4cf0bf51 | 819 | return ERR_PTR(ret); |
4e3c1b9b MD |
820 | } |
821 | ||
3c997079 MD |
822 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
823 | struct lttng_kernel_event *event_param, | |
824 | void *filter, | |
825 | const struct lttng_event_desc *event_desc, | |
826 | enum lttng_kernel_instrumentation itype) | |
827 | { | |
828 | struct lttng_event *event; | |
829 | ||
830 | mutex_lock(&sessions_mutex); | |
831 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
832 | itype); | |
833 | mutex_unlock(&sessions_mutex); | |
834 | return event; | |
835 | } | |
836 | ||
837 | /* Only used for tracepoints for now. */ | |
838 | static | |
839 | void register_event(struct lttng_event *event) | |
840 | { | |
841 | const struct lttng_event_desc *desc; | |
f127e61e | 842 | int ret = -EINVAL; |
3c997079 | 843 | |
3c997079 MD |
844 | if (event->registered) |
845 | return; | |
4ecb5ad5 | 846 | |
3c997079 | 847 | desc = event->desc; |
4ecb5ad5 MD |
848 | switch (event->instrumentation) { |
849 | case LTTNG_KERNEL_TRACEPOINT: | |
850 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
851 | desc->probe_callback, | |
852 | event); | |
853 | break; | |
854 | case LTTNG_KERNEL_SYSCALL: | |
ad594e3a | 855 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
856 | break; |
857 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 858 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 859 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
860 | case LTTNG_KERNEL_NOOP: |
861 | ret = 0; | |
862 | break; | |
2bf9218e | 863 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
864 | default: |
865 | WARN_ON_ONCE(1); | |
866 | } | |
3c997079 MD |
867 | if (!ret) |
868 | event->registered = 1; | |
869 | } | |
870 | ||
4e3c1b9b MD |
871 | /* |
872 | * Only used internally at session destruction. | |
873 | */ | |
a90917c3 | 874 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 875 | { |
4ecb5ad5 | 876 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
877 | int ret = -EINVAL; |
878 | ||
3c997079 MD |
879 | if (!event->registered) |
880 | return 0; | |
881 | ||
4ecb5ad5 | 882 | desc = event->desc; |
38d024ae | 883 | switch (event->instrumentation) { |
ab2277d6 | 884 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 885 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 886 | event->desc->probe_callback, |
11b5a3c2 | 887 | event); |
baf20995 | 888 | break; |
ab2277d6 | 889 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 890 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
891 | ret = 0; |
892 | break; | |
7371f44c MD |
893 | case LTTNG_KERNEL_KRETPROBE: |
894 | lttng_kretprobes_unregister(event); | |
895 | ret = 0; | |
896 | break; | |
33a39a3c | 897 | case LTTNG_KERNEL_SYSCALL: |
ad594e3a | 898 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
899 | break; |
900 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
901 | ret = 0; |
902 | break; | |
149b9a9d YB |
903 | case LTTNG_KERNEL_UPROBE: |
904 | lttng_uprobes_unregister(event); | |
905 | ret = 0; | |
906 | break; | |
2bf9218e | 907 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
908 | default: |
909 | WARN_ON_ONCE(1); | |
910 | } | |
3c997079 MD |
911 | if (!ret) |
912 | event->registered = 0; | |
dda6a249 MD |
913 | return ret; |
914 | } | |
915 | ||
916 | /* | |
917 | * Only used internally at session destruction. | |
918 | */ | |
be066e6c | 919 | static |
a90917c3 | 920 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 921 | { |
b3fdf78b MD |
922 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
923 | ||
edeb3137 MD |
924 | switch (event->instrumentation) { |
925 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 926 | lttng_event_put(event->desc); |
edeb3137 MD |
927 | break; |
928 | case LTTNG_KERNEL_KPROBE: | |
929 | module_put(event->desc->owner); | |
930 | lttng_kprobes_destroy_private(event); | |
931 | break; | |
7371f44c MD |
932 | case LTTNG_KERNEL_KRETPROBE: |
933 | module_put(event->desc->owner); | |
934 | lttng_kretprobes_destroy_private(event); | |
935 | break; | |
259b6cb3 | 936 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 937 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 938 | break; |
149b9a9d YB |
939 | case LTTNG_KERNEL_UPROBE: |
940 | module_put(event->desc->owner); | |
941 | lttng_uprobes_destroy_private(event); | |
942 | break; | |
2bf9218e | 943 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
944 | default: |
945 | WARN_ON_ONCE(1); | |
946 | } | |
dda6a249 | 947 | list_del(&event->list); |
8070f5c0 | 948 | lttng_destroy_context(event->ctx); |
b3fdf78b MD |
949 | lttng_free_event_filter_runtime(event); |
950 | /* Free event enabler refs */ | |
951 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
952 | &event->enablers_ref_head, node) | |
953 | kfree(enabler_ref); | |
11b5a3c2 | 954 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
955 | } |
956 | ||
d1f652f8 MD |
957 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
958 | enum tracker_type tracker_type) | |
e0130fab | 959 | { |
d1f652f8 MD |
960 | switch (tracker_type) { |
961 | case TRACKER_PID: | |
962 | return &session->pid_tracker; | |
963 | case TRACKER_VPID: | |
964 | return &session->vpid_tracker; | |
965 | case TRACKER_UID: | |
966 | return &session->uid_tracker; | |
967 | case TRACKER_VUID: | |
968 | return &session->vuid_tracker; | |
969 | case TRACKER_GID: | |
970 | return &session->gid_tracker; | |
971 | case TRACKER_VGID: | |
972 | return &session->vgid_tracker; | |
973 | default: | |
974 | WARN_ON_ONCE(1); | |
975 | return NULL; | |
976 | } | |
977 | } | |
978 | ||
979 | int lttng_session_track_id(struct lttng_session *session, | |
980 | enum tracker_type tracker_type, int id) | |
981 | { | |
982 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
983 | int ret; |
984 | ||
d1f652f8 MD |
985 | tracker = get_tracker(session, tracker_type); |
986 | if (!tracker) | |
987 | return -EINVAL; | |
988 | if (id < -1) | |
e0130fab MD |
989 | return -EINVAL; |
990 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
991 | if (id == -1) { |
992 | /* track all ids: destroy tracker. */ | |
993 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
994 | ret = 0; |
995 | } else { | |
d1f652f8 | 996 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 997 | } |
e0130fab MD |
998 | mutex_unlock(&sessions_mutex); |
999 | return ret; | |
1000 | } | |
1001 | ||
d1f652f8 MD |
1002 | int lttng_session_untrack_id(struct lttng_session *session, |
1003 | enum tracker_type tracker_type, int id) | |
e0130fab | 1004 | { |
d1f652f8 | 1005 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1006 | int ret; |
1007 | ||
d1f652f8 MD |
1008 | tracker = get_tracker(session, tracker_type); |
1009 | if (!tracker) | |
1010 | return -EINVAL; | |
1011 | if (id < -1) | |
e0130fab MD |
1012 | return -EINVAL; |
1013 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1014 | if (id == -1) { |
1015 | /* untrack all ids: replace by empty tracker. */ | |
1016 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1017 | } else { |
d1f652f8 | 1018 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1019 | } |
e0130fab MD |
1020 | mutex_unlock(&sessions_mutex); |
1021 | return ret; | |
1022 | } | |
1023 | ||
7e6f9ef6 | 1024 | static |
d1f652f8 | 1025 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1026 | { |
d1f652f8 MD |
1027 | struct lttng_id_tracker *id_tracker = m->private; |
1028 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1029 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1030 | int iter = 0, i; |
1031 | ||
1032 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1033 | if (id_tracker_p) { |
1034 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1035 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1036 | |
f934e302 | 1037 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1038 | if (iter++ >= *pos) |
1039 | return e; | |
1040 | } | |
1041 | } | |
1042 | } else { | |
d1f652f8 | 1043 | /* ID tracker disabled. */ |
7e6f9ef6 | 1044 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1045 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1046 | } |
1047 | iter++; | |
1048 | } | |
1049 | /* End of list */ | |
1050 | return NULL; | |
1051 | } | |
1052 | ||
1053 | /* Called with sessions_mutex held. */ | |
1054 | static | |
d1f652f8 | 1055 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1056 | { |
d1f652f8 MD |
1057 | struct lttng_id_tracker *id_tracker = m->private; |
1058 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1059 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1060 | int iter = 0, i; |
1061 | ||
1062 | (*ppos)++; | |
d1f652f8 MD |
1063 | if (id_tracker_p) { |
1064 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1065 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1066 | |
f934e302 | 1067 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1068 | if (iter++ >= *ppos) |
1069 | return e; | |
1070 | } | |
1071 | } | |
1072 | } else { | |
d1f652f8 | 1073 | /* ID tracker disabled. */ |
7e6f9ef6 | 1074 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1075 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1076 | iter++; |
1077 | } | |
1078 | ||
1079 | /* End of list */ | |
1080 | return NULL; | |
1081 | } | |
1082 | ||
1083 | static | |
d1f652f8 | 1084 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1085 | { |
1086 | mutex_unlock(&sessions_mutex); | |
1087 | } | |
1088 | ||
1089 | static | |
d1f652f8 | 1090 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1091 | { |
d1f652f8 MD |
1092 | struct lttng_id_tracker *id_tracker = m->private; |
1093 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1094 | int id; | |
7e6f9ef6 | 1095 | |
d1f652f8 | 1096 | if (p == id_tracker_p) { |
7e6f9ef6 | 1097 | /* Tracker disabled. */ |
d1f652f8 | 1098 | id = -1; |
7e6f9ef6 | 1099 | } else { |
d1f652f8 | 1100 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1101 | |
d1f652f8 MD |
1102 | id = lttng_id_tracker_get_node_id(e); |
1103 | } | |
1104 | switch (id_tracker->tracker_type) { | |
1105 | case TRACKER_PID: | |
1106 | seq_printf(m, "process { pid = %d; };\n", id); | |
1107 | break; | |
1108 | case TRACKER_VPID: | |
1109 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1110 | break; | |
1111 | case TRACKER_UID: | |
1112 | seq_printf(m, "user { uid = %d; };\n", id); | |
1113 | break; | |
1114 | case TRACKER_VUID: | |
1115 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1116 | break; | |
1117 | case TRACKER_GID: | |
1118 | seq_printf(m, "group { gid = %d; };\n", id); | |
1119 | break; | |
1120 | case TRACKER_VGID: | |
1121 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1122 | break; | |
1123 | default: | |
1124 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1125 | } |
7e6f9ef6 MD |
1126 | return 0; |
1127 | } | |
1128 | ||
1129 | static | |
d1f652f8 MD |
1130 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1131 | .start = id_list_start, | |
1132 | .next = id_list_next, | |
1133 | .stop = id_list_stop, | |
1134 | .show = id_list_show, | |
7e6f9ef6 MD |
1135 | }; |
1136 | ||
1137 | static | |
d1f652f8 | 1138 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1139 | { |
d1f652f8 | 1140 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1141 | } |
1142 | ||
1143 | static | |
d1f652f8 | 1144 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1145 | { |
1146 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1147 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1148 | int ret; |
1149 | ||
d1f652f8 | 1150 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1151 | ret = seq_release(inode, file); |
d1f652f8 MD |
1152 | if (!ret) |
1153 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1154 | return ret; |
1155 | } | |
1156 | ||
d1f652f8 | 1157 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1158 | .owner = THIS_MODULE, |
d1f652f8 | 1159 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1160 | .read = seq_read, |
1161 | .llseek = seq_lseek, | |
d1f652f8 | 1162 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1163 | }; |
1164 | ||
d1f652f8 MD |
1165 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1166 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1167 | { |
d1f652f8 | 1168 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1169 | struct seq_file *m; |
1170 | int file_fd, ret; | |
1171 | ||
1172 | file_fd = lttng_get_unused_fd(); | |
1173 | if (file_fd < 0) { | |
1174 | ret = file_fd; | |
1175 | goto fd_error; | |
1176 | } | |
1177 | ||
d1f652f8 MD |
1178 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1179 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1180 | NULL, O_RDWR); |
d1f652f8 MD |
1181 | if (IS_ERR(tracker_ids_list_file)) { |
1182 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1183 | goto file_error; |
1184 | } | |
98d7281c MJ |
1185 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1186 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1187 | goto refcount_error; |
1188 | } | |
d1f652f8 | 1189 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1190 | if (ret < 0) |
1191 | goto open_error; | |
d1f652f8 MD |
1192 | m = tracker_ids_list_file->private_data; |
1193 | ||
1194 | m->private = get_tracker(session, tracker_type); | |
1195 | BUG_ON(!m->private); | |
1196 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1197 | |
1198 | return file_fd; | |
1199 | ||
1200 | open_error: | |
9c1f4643 MD |
1201 | atomic_long_dec(&session->file->f_count); |
1202 | refcount_error: | |
d1f652f8 | 1203 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1204 | file_error: |
1205 | put_unused_fd(file_fd); | |
1206 | fd_error: | |
1207 | return ret; | |
1208 | } | |
1209 | ||
3c997079 MD |
1210 | /* |
1211 | * Enabler management. | |
1212 | */ | |
1213 | static | |
4993071a PP |
1214 | int lttng_match_enabler_star_glob(const char *desc_name, |
1215 | const char *pattern) | |
3c997079 | 1216 | { |
cbc19040 MD |
1217 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1218 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1219 | return 0; |
1220 | return 1; | |
1221 | } | |
1222 | ||
1223 | static | |
4ecb5ad5 MD |
1224 | int lttng_match_enabler_name(const char *desc_name, |
1225 | const char *name) | |
3c997079 | 1226 | { |
4ecb5ad5 | 1227 | if (strcmp(desc_name, name)) |
3c997079 MD |
1228 | return 0; |
1229 | return 1; | |
1230 | } | |
1231 | ||
1232 | static | |
1233 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1234 | struct lttng_enabler *enabler) | |
1235 | { | |
4ecb5ad5 | 1236 | const char *desc_name, *enabler_name; |
ad594e3a | 1237 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1238 | |
1239 | enabler_name = enabler->event_param.name; | |
1240 | switch (enabler->event_param.instrumentation) { | |
1241 | case LTTNG_KERNEL_TRACEPOINT: | |
1242 | desc_name = desc->name; | |
ad594e3a MD |
1243 | switch (enabler->type) { |
1244 | case LTTNG_ENABLER_STAR_GLOB: | |
1245 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1246 | case LTTNG_ENABLER_NAME: | |
1247 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1248 | default: | |
1249 | return -EINVAL; | |
1250 | } | |
4ecb5ad5 MD |
1251 | break; |
1252 | case LTTNG_KERNEL_SYSCALL: | |
1253 | desc_name = desc->name; | |
ad594e3a | 1254 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1255 | desc_name += strlen("compat_"); |
ad594e3a MD |
1256 | compat = true; |
1257 | } | |
4ecb5ad5 MD |
1258 | if (!strncmp(desc_name, "syscall_exit_", |
1259 | strlen("syscall_exit_"))) { | |
1260 | desc_name += strlen("syscall_exit_"); | |
1261 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1262 | strlen("syscall_entry_"))) { | |
1263 | desc_name += strlen("syscall_entry_"); | |
ad594e3a | 1264 | entry = true; |
4ecb5ad5 MD |
1265 | } else { |
1266 | WARN_ON_ONCE(1); | |
1267 | return -EINVAL; | |
1268 | } | |
ad594e3a MD |
1269 | switch (enabler->event_param.u.syscall.entryexit) { |
1270 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1271 | break; | |
1272 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1273 | if (!entry) | |
1274 | return 0; | |
1275 | break; | |
1276 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1277 | if (entry) | |
1278 | return 0; | |
1279 | break; | |
1280 | default: | |
1281 | return -EINVAL; | |
1282 | } | |
1283 | switch (enabler->event_param.u.syscall.abi) { | |
1284 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1285 | break; | |
1286 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1287 | if (compat) | |
1288 | return 0; | |
1289 | break; | |
1290 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1291 | if (!compat) | |
1292 | return 0; | |
1293 | break; | |
1294 | default: | |
1295 | return -EINVAL; | |
1296 | } | |
1297 | switch (enabler->event_param.u.syscall.match) { | |
1298 | case LTTNG_SYSCALL_MATCH_NAME: | |
1299 | switch (enabler->type) { | |
1300 | case LTTNG_ENABLER_STAR_GLOB: | |
1301 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
1302 | case LTTNG_ENABLER_NAME: | |
1303 | return lttng_match_enabler_name(desc_name, enabler_name); | |
1304 | default: | |
1305 | return -EINVAL; | |
1306 | } | |
1307 | break; | |
1308 | case LTTNG_SYSCALL_MATCH_NR: | |
1309 | return -EINVAL; /* Not implemented. */ | |
1310 | default: | |
1311 | return -EINVAL; | |
1312 | } | |
4ecb5ad5 MD |
1313 | break; |
1314 | default: | |
1315 | WARN_ON_ONCE(1); | |
1316 | return -EINVAL; | |
1317 | } | |
3c997079 MD |
1318 | } |
1319 | ||
1320 | static | |
1321 | int lttng_event_match_enabler(struct lttng_event *event, | |
1322 | struct lttng_enabler *enabler) | |
1323 | { | |
33a39a3c MD |
1324 | if (enabler->event_param.instrumentation != event->instrumentation) |
1325 | return 0; | |
3c997079 MD |
1326 | if (lttng_desc_match_enabler(event->desc, enabler) |
1327 | && event->chan == enabler->chan) | |
1328 | return 1; | |
1329 | else | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | static | |
1334 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1335 | struct lttng_enabler *enabler) | |
1336 | { | |
1337 | struct lttng_enabler_ref *enabler_ref; | |
1338 | ||
1339 | list_for_each_entry(enabler_ref, | |
1340 | &event->enablers_ref_head, node) { | |
1341 | if (enabler_ref->ref == enabler) | |
1342 | return enabler_ref; | |
1343 | } | |
1344 | return NULL; | |
1345 | } | |
1346 | ||
3c997079 | 1347 | static |
33a39a3c | 1348 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1349 | { |
1350 | struct lttng_session *session = enabler->chan->session; | |
1351 | struct lttng_probe_desc *probe_desc; | |
1352 | const struct lttng_event_desc *desc; | |
1353 | int i; | |
1354 | struct list_head *probe_list; | |
1355 | ||
1356 | probe_list = lttng_get_probe_list_head(); | |
1357 | /* | |
1358 | * For each probe event, if we find that a probe event matches | |
1359 | * our enabler, create an associated lttng_event if not | |
1360 | * already present. | |
1361 | */ | |
1362 | list_for_each_entry(probe_desc, probe_list, head) { | |
1363 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1364 | int found = 0; | |
1365 | struct hlist_head *head; | |
1366 | const char *event_name; | |
1367 | size_t name_len; | |
1368 | uint32_t hash; | |
1369 | struct lttng_event *event; | |
1370 | ||
1371 | desc = probe_desc->event_desc[i]; | |
1372 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1373 | continue; | |
1374 | event_name = desc->name; | |
1375 | name_len = strlen(event_name); | |
1376 | ||
1377 | /* | |
1378 | * Check if already created. | |
1379 | */ | |
1380 | hash = jhash(event_name, name_len, 0); | |
1381 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1382 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1383 | if (event->desc == desc |
1384 | && event->chan == enabler->chan) | |
1385 | found = 1; | |
1386 | } | |
1387 | if (found) | |
1388 | continue; | |
1389 | ||
1390 | /* | |
1391 | * We need to create an event for this | |
1392 | * event probe. | |
1393 | */ | |
1394 | event = _lttng_event_create(enabler->chan, | |
1395 | NULL, NULL, desc, | |
1396 | LTTNG_KERNEL_TRACEPOINT); | |
1397 | if (!event) { | |
1398 | printk(KERN_INFO "Unable to create event %s\n", | |
1399 | probe_desc->event_desc[i]->name); | |
1400 | } | |
1401 | } | |
1402 | } | |
1403 | } | |
1404 | ||
33a39a3c MD |
1405 | static |
1406 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1407 | { | |
1408 | int ret; | |
1409 | ||
1410 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1411 | WARN_ON_ONCE(ret); | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * Create struct lttng_event if it is missing and present in the list of | |
1416 | * tracepoint probes. | |
1417 | * Should be called with sessions mutex held. | |
1418 | */ | |
1419 | static | |
1420 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1421 | { | |
1422 | switch (enabler->event_param.instrumentation) { | |
1423 | case LTTNG_KERNEL_TRACEPOINT: | |
1424 | lttng_create_tracepoint_if_missing(enabler); | |
1425 | break; | |
1426 | case LTTNG_KERNEL_SYSCALL: | |
1427 | lttng_create_syscall_if_missing(enabler); | |
1428 | break; | |
1429 | default: | |
1430 | WARN_ON_ONCE(1); | |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | ||
3c997079 MD |
1435 | /* |
1436 | * Create events associated with an enabler (if not already present), | |
1437 | * and add backward reference from the event to the enabler. | |
1438 | * Should be called with sessions mutex held. | |
1439 | */ | |
1440 | static | |
1441 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1442 | { | |
ad594e3a MD |
1443 | struct lttng_channel *chan = enabler->chan; |
1444 | struct lttng_session *session = chan->session; | |
3c997079 MD |
1445 | struct lttng_event *event; |
1446 | ||
ad594e3a MD |
1447 | if (enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1448 | enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1449 | enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1450 | enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1451 | !strcmp(enabler->event_param.name, "*")) { | |
1452 | if (enabler->enabled) | |
1453 | WRITE_ONCE(chan->syscall_all, 1); | |
1454 | else | |
1455 | WRITE_ONCE(chan->syscall_all, 0); | |
1456 | } | |
1457 | ||
3c997079 MD |
1458 | /* First ensure that probe events are created for this enabler. */ |
1459 | lttng_create_event_if_missing(enabler); | |
1460 | ||
1461 | /* For each event matching enabler in session event list. */ | |
1462 | list_for_each_entry(event, &session->events, list) { | |
1463 | struct lttng_enabler_ref *enabler_ref; | |
1464 | ||
1465 | if (!lttng_event_match_enabler(event, enabler)) | |
1466 | continue; | |
1467 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1468 | if (!enabler_ref) { | |
1469 | /* | |
1470 | * If no backward ref, create it. | |
1471 | * Add backward ref from event to enabler. | |
1472 | */ | |
1473 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1474 | if (!enabler_ref) | |
1475 | return -ENOMEM; | |
1476 | enabler_ref->ref = enabler; | |
1477 | list_add(&enabler_ref->node, | |
1478 | &event->enablers_ref_head); | |
1479 | } | |
1480 | ||
f127e61e MD |
1481 | /* |
1482 | * Link filter bytecodes if not linked yet. | |
1483 | */ | |
1484 | lttng_enabler_event_link_bytecode(event, enabler); | |
1485 | ||
3c997079 MD |
1486 | /* TODO: merge event context. */ |
1487 | } | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * Called at module load: connect the probe on all enablers matching | |
1493 | * this event. | |
1494 | * Called with sessions lock held. | |
1495 | */ | |
1496 | int lttng_fix_pending_events(void) | |
1497 | { | |
1498 | struct lttng_session *session; | |
1499 | ||
1500 | list_for_each_entry(session, &sessions, list) | |
1501 | lttng_session_lazy_sync_enablers(session); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1506 | struct lttng_kernel_event *event_param, | |
1507 | struct lttng_channel *chan) | |
1508 | { | |
1509 | struct lttng_enabler *enabler; | |
1510 | ||
1511 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1512 | if (!enabler) | |
1513 | return NULL; | |
1514 | enabler->type = type; | |
07dfc1d0 | 1515 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1516 | memcpy(&enabler->event_param, event_param, |
1517 | sizeof(enabler->event_param)); | |
1518 | enabler->chan = chan; | |
1519 | /* ctx left NULL */ | |
4fd19d8a | 1520 | enabler->enabled = 0; |
3c997079 MD |
1521 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1522 | mutex_lock(&sessions_mutex); | |
1523 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1524 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1525 | mutex_unlock(&sessions_mutex); | |
1526 | return enabler; | |
1527 | } | |
1528 | ||
1529 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1530 | { | |
1531 | mutex_lock(&sessions_mutex); | |
1532 | enabler->enabled = 1; | |
1533 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1534 | mutex_unlock(&sessions_mutex); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1539 | { | |
1540 | mutex_lock(&sessions_mutex); | |
1541 | enabler->enabled = 0; | |
1542 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1543 | mutex_unlock(&sessions_mutex); | |
1544 | return 0; | |
1545 | } | |
1546 | ||
07dfc1d0 MD |
1547 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1548 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1549 | { | |
1550 | struct lttng_filter_bytecode_node *bytecode_node; | |
1551 | uint32_t bytecode_len; | |
1552 | int ret; | |
1553 | ||
1554 | ret = get_user(bytecode_len, &bytecode->len); | |
1555 | if (ret) | |
1556 | return ret; | |
1557 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1558 | GFP_KERNEL); | |
1559 | if (!bytecode_node) | |
1560 | return -ENOMEM; | |
1561 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1562 | sizeof(*bytecode) + bytecode_len); | |
1563 | if (ret) | |
1564 | goto error_free; | |
1565 | bytecode_node->enabler = enabler; | |
1566 | /* Enforce length based on allocated size */ | |
1567 | bytecode_node->bc.len = bytecode_len; | |
1568 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1569 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1570 | return 0; | |
1571 | ||
1572 | error_free: | |
1573 | kfree(bytecode_node); | |
1574 | return ret; | |
1575 | } | |
1576 | ||
3aed4dca FD |
1577 | int lttng_event_add_callsite(struct lttng_event *event, |
1578 | struct lttng_kernel_event_callsite __user *callsite) | |
1579 | { | |
1580 | ||
1581 | switch (event->instrumentation) { | |
1582 | case LTTNG_KERNEL_UPROBE: | |
1583 | return lttng_uprobes_add_callsite(event, callsite); | |
1584 | default: | |
1585 | return -EINVAL; | |
1586 | } | |
1587 | } | |
1588 | ||
3c997079 MD |
1589 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1590 | struct lttng_kernel_context *context_param) | |
1591 | { | |
1592 | return -ENOSYS; | |
1593 | } | |
1594 | ||
1595 | static | |
1596 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1597 | { | |
07dfc1d0 MD |
1598 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1599 | ||
1600 | /* Destroy filter bytecode */ | |
1601 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1602 | &enabler->filter_bytecode_head, node) { | |
1603 | kfree(filter_node); | |
1604 | } | |
1605 | ||
3c997079 MD |
1606 | /* Destroy contexts */ |
1607 | lttng_destroy_context(enabler->ctx); | |
1608 | ||
1609 | list_del(&enabler->node); | |
1610 | kfree(enabler); | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * lttng_session_sync_enablers should be called just before starting a | |
1615 | * session. | |
1616 | * Should be called with sessions mutex held. | |
1617 | */ | |
1618 | static | |
1619 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1620 | { | |
1621 | struct lttng_enabler *enabler; | |
1622 | struct lttng_event *event; | |
1623 | ||
1624 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1625 | lttng_enabler_ref_events(enabler); | |
1626 | /* | |
1627 | * For each event, if at least one of its enablers is enabled, | |
1628 | * and its channel and session transient states are enabled, we | |
1629 | * enable the event, else we disable it. | |
1630 | */ | |
1631 | list_for_each_entry(event, &session->events, list) { | |
1632 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1633 | struct lttng_bytecode_runtime *runtime; |
1634 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1635 | |
4ecb5ad5 MD |
1636 | switch (event->instrumentation) { |
1637 | case LTTNG_KERNEL_TRACEPOINT: | |
1638 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1639 | /* Enable events */ |
1640 | list_for_each_entry(enabler_ref, | |
1641 | &event->enablers_ref_head, node) { | |
1642 | if (enabler_ref->ref->enabled) { | |
1643 | enabled = 1; | |
1644 | break; | |
1645 | } | |
1646 | } | |
4ecb5ad5 MD |
1647 | break; |
1648 | default: | |
3c997079 MD |
1649 | /* Not handled with lazy sync. */ |
1650 | continue; | |
1651 | } | |
1652 | /* | |
1653 | * Enabled state is based on union of enablers, with | |
1654 | * intesection of session and channel transient enable | |
1655 | * states. | |
1656 | */ | |
1657 | enabled = enabled && session->tstate && event->chan->tstate; | |
1658 | ||
a8f2d0c7 | 1659 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1660 | /* |
1661 | * Sync tracepoint registration with event enabled | |
1662 | * state. | |
1663 | */ | |
1664 | if (enabled) { | |
1665 | register_event(event); | |
1666 | } else { | |
1667 | _lttng_event_unregister(event); | |
1668 | } | |
07dfc1d0 MD |
1669 | |
1670 | /* Check if has enablers without bytecode enabled */ | |
1671 | list_for_each_entry(enabler_ref, | |
1672 | &event->enablers_ref_head, node) { | |
1673 | if (enabler_ref->ref->enabled | |
1674 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1675 | has_enablers_without_bytecode = 1; | |
1676 | break; | |
1677 | } | |
1678 | } | |
1679 | event->has_enablers_without_bytecode = | |
1680 | has_enablers_without_bytecode; | |
1681 | ||
1682 | /* Enable filters */ | |
1683 | list_for_each_entry(runtime, | |
f127e61e | 1684 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1685 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1686 | } |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * Apply enablers to session events, adding events to session if need | |
1691 | * be. It is required after each modification applied to an active | |
1692 | * session, and right before session "start". | |
1693 | * "lazy" sync means we only sync if required. | |
1694 | * Should be called with sessions mutex held. | |
1695 | */ | |
1696 | static | |
1697 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1698 | { | |
1699 | /* We can skip if session is not active */ | |
1700 | if (!session->active) | |
1701 | return; | |
1702 | lttng_session_sync_enablers(session); | |
1703 | } | |
1704 | ||
1ec3f75a | 1705 | /* |
d83004aa JD |
1706 | * Serialize at most one packet worth of metadata into a metadata |
1707 | * channel. | |
92d9f5e6 MD |
1708 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1709 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1710 | * allows us to do racy operations such as looking for remaining space left in | |
1711 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1712 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1713 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1714 | * Returns the number of bytes written in the channel, 0 if no data |
1715 | * was written and a negative value on error. | |
1ec3f75a | 1716 | */ |
b3b8072b | 1717 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
122c63cb | 1718 | struct channel *chan, bool *coherent) |
d83004aa JD |
1719 | { |
1720 | struct lib_ring_buffer_ctx ctx; | |
1721 | int ret = 0; | |
1722 | size_t len, reserve_len; | |
1723 | ||
f613e3e6 | 1724 | /* |
92d9f5e6 MD |
1725 | * Ensure we support mutiple get_next / put sequences followed by |
1726 | * put_next. The metadata cache lock protects reading the metadata | |
1727 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1728 | * "flush" operations on the buffer invoked by different processes. | |
1729 | * Moreover, since the metadata cache memory can be reallocated, we | |
1730 | * need to have exclusive access against updates even though we only | |
1731 | * read it. | |
f613e3e6 | 1732 | */ |
92d9f5e6 | 1733 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1734 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1735 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1736 | goto end; |
f613e3e6 | 1737 | |
9616f0bf JD |
1738 | /* Metadata regenerated, change the version. */ |
1739 | if (stream->metadata_cache->version != stream->version) | |
1740 | stream->version = stream->metadata_cache->version; | |
1741 | ||
d83004aa | 1742 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1743 | stream->metadata_in; |
9de2c215 | 1744 | if (!len) |
de23d59d | 1745 | goto end; |
d83004aa | 1746 | reserve_len = min_t(size_t, |
b3b8072b | 1747 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1748 | len); |
b3b8072b | 1749 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1750 | sizeof(char), -1); |
1751 | /* | |
1752 | * If reservation failed, return an error to the caller. | |
1753 | */ | |
b3b8072b | 1754 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1755 | if (ret != 0) { |
1756 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
122c63cb | 1757 | stream->coherent = false; |
d83004aa JD |
1758 | goto end; |
1759 | } | |
b3b8072b | 1760 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1761 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1762 | reserve_len); |
b3b8072b | 1763 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1764 | stream->metadata_in += reserve_len; |
3780dda9 | 1765 | if (reserve_len < len) |
122c63cb MD |
1766 | stream->coherent = false; |
1767 | else | |
1768 | stream->coherent = true; | |
d83004aa JD |
1769 | ret = reserve_len; |
1770 | ||
1771 | end: | |
122c63cb MD |
1772 | if (coherent) |
1773 | *coherent = stream->coherent; | |
92d9f5e6 | 1774 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1775 | return ret; |
1776 | } | |
1777 | ||
122c63cb MD |
1778 | static |
1779 | void lttng_metadata_begin(struct lttng_session *session) | |
1780 | { | |
3780dda9 MD |
1781 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1782 | mutex_lock(&session->metadata_cache->lock); | |
122c63cb MD |
1783 | } |
1784 | ||
1785 | static | |
1786 | void lttng_metadata_end(struct lttng_session *session) | |
1787 | { | |
3780dda9 MD |
1788 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1789 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1790 | struct lttng_metadata_stream *stream; | |
1791 | ||
3780dda9 MD |
1792 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1793 | wake_up_interruptible(&stream->read_wait); | |
e0d82ce5 | 1794 | mutex_unlock(&session->metadata_cache->lock); |
3780dda9 | 1795 | } |
122c63cb MD |
1796 | } |
1797 | ||
d83004aa JD |
1798 | /* |
1799 | * Write the metadata to the metadata cache. | |
1800 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1801 | * The metadata cache lock protects us from concurrent read access from |
1802 | * thread outputting metadata content to ring buffer. | |
122c63cb MD |
1803 | * The content of the printf is printed as a single atomic metadata |
1804 | * transaction. | |
d83004aa | 1805 | */ |
a90917c3 | 1806 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1807 | const char *fmt, ...) |
1808 | { | |
c099397a | 1809 | char *str; |
d83004aa | 1810 | size_t len; |
c099397a MD |
1811 | va_list ap; |
1812 | ||
57ccbfa6 | 1813 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
1814 | |
1815 | va_start(ap, fmt); | |
1816 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1817 | va_end(ap); | |
1818 | if (!str) | |
1819 | return -ENOMEM; | |
1820 | ||
1ec3f75a | 1821 | len = strlen(str); |
3780dda9 | 1822 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1823 | if (session->metadata_cache->metadata_written + len > |
1824 | session->metadata_cache->cache_alloc) { | |
1825 | char *tmp_cache_realloc; | |
1826 | unsigned int tmp_cache_alloc_size; | |
1827 | ||
1828 | tmp_cache_alloc_size = max_t(unsigned int, | |
1829 | session->metadata_cache->cache_alloc + len, | |
1830 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1831 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1832 | if (!tmp_cache_realloc) |
1833 | goto err; | |
a606b6e8 ML |
1834 | if (session->metadata_cache->data) { |
1835 | memcpy(tmp_cache_realloc, | |
1836 | session->metadata_cache->data, | |
1837 | session->metadata_cache->cache_alloc); | |
1838 | vfree(session->metadata_cache->data); | |
1839 | } | |
1840 | ||
d83004aa JD |
1841 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1842 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1843 | } |
d83004aa JD |
1844 | memcpy(session->metadata_cache->data + |
1845 | session->metadata_cache->metadata_written, | |
1846 | str, len); | |
1847 | session->metadata_cache->metadata_written += len; | |
c099397a | 1848 | kfree(str); |
d83004aa | 1849 | |
d83004aa JD |
1850 | return 0; |
1851 | ||
1852 | err: | |
1853 | kfree(str); | |
1854 | return -ENOMEM; | |
c099397a MD |
1855 | } |
1856 | ||
f513b2bf MD |
1857 | static |
1858 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1859 | { | |
1860 | size_t i; | |
1861 | ||
1862 | for (i = 0; i < nesting; i++) { | |
1863 | int ret; | |
1864 | ||
1865 | ret = lttng_metadata_printf(session, " "); | |
1866 | if (ret) { | |
1867 | return ret; | |
1868 | } | |
1869 | } | |
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | /* | |
1874 | * Must be called with sessions_mutex held. | |
1875 | */ | |
1876 | static | |
1877 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1878 | const struct lttng_type *type, | |
1879 | size_t nesting) | |
1880 | { | |
1881 | int ret; | |
1882 | uint32_t i, nr_fields; | |
1883 | ||
1884 | ret = print_tabs(session, nesting); | |
1885 | if (ret) | |
1886 | return ret; | |
1887 | ret = lttng_metadata_printf(session, | |
1888 | "struct {\n"); | |
1889 | if (ret) | |
1890 | return ret; | |
1891 | nr_fields = type->u._struct.nr_fields; | |
1892 | for (i = 0; i < nr_fields; i++) { | |
1893 | const struct lttng_event_field *iter_field; | |
1894 | ||
1895 | iter_field = &type->u._struct.fields[i]; | |
1896 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1897 | if (ret) | |
1898 | return ret; | |
1899 | } | |
1900 | ret = print_tabs(session, nesting); | |
1901 | if (ret) | |
1902 | return ret; | |
1903 | ret = lttng_metadata_printf(session, | |
1904 | "}"); | |
1905 | return ret; | |
1906 | } | |
1907 | ||
1908 | /* | |
1909 | * Must be called with sessions_mutex held. | |
1910 | */ | |
1911 | static | |
1912 | int _lttng_struct_statedump(struct lttng_session *session, | |
1913 | const struct lttng_event_field *field, | |
1914 | size_t nesting) | |
1915 | { | |
1916 | int ret; | |
1917 | ||
1918 | ret = _lttng_struct_type_statedump(session, | |
1919 | &field->type, nesting); | |
1920 | if (ret) | |
1921 | return ret; | |
1922 | ret = lttng_metadata_printf(session, | |
1923 | "_%s;\n", | |
1924 | field->name); | |
1925 | return ret; | |
1926 | } | |
1927 | ||
65c85aa6 MD |
1928 | /* |
1929 | * Must be called with sessions_mutex held. | |
1930 | */ | |
1931 | static | |
1932 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1933 | const struct lttng_type *type, | |
1934 | size_t nesting) | |
1935 | { | |
1936 | int ret; | |
1937 | uint32_t i, nr_choices; | |
1938 | ||
1939 | ret = print_tabs(session, nesting); | |
1940 | if (ret) | |
1941 | return ret; | |
1942 | ret = lttng_metadata_printf(session, | |
1943 | "variant <_%s> {\n", | |
1944 | type->u.variant.tag_name); | |
1945 | if (ret) | |
1946 | return ret; | |
1947 | nr_choices = type->u.variant.nr_choices; | |
1948 | for (i = 0; i < nr_choices; i++) { | |
1949 | const struct lttng_event_field *iter_field; | |
1950 | ||
1951 | iter_field = &type->u.variant.choices[i]; | |
1952 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1953 | if (ret) | |
1954 | return ret; | |
1955 | } | |
1956 | ret = print_tabs(session, nesting); | |
1957 | if (ret) | |
1958 | return ret; | |
1959 | ret = lttng_metadata_printf(session, | |
1960 | "}"); | |
1961 | return ret; | |
1962 | } | |
1963 | ||
1964 | /* | |
1965 | * Must be called with sessions_mutex held. | |
1966 | */ | |
1967 | static | |
1968 | int _lttng_variant_statedump(struct lttng_session *session, | |
1969 | const struct lttng_event_field *field, | |
1970 | size_t nesting) | |
1971 | { | |
1972 | int ret; | |
1973 | ||
1974 | ret = _lttng_variant_type_statedump(session, | |
1975 | &field->type, nesting); | |
1976 | if (ret) | |
1977 | return ret; | |
1978 | ret = lttng_metadata_printf(session, | |
1979 | "_%s;\n", | |
1980 | field->name); | |
1981 | return ret; | |
1982 | } | |
1983 | ||
f513b2bf MD |
1984 | /* |
1985 | * Must be called with sessions_mutex held. | |
1986 | */ | |
1987 | static | |
1988 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1989 | const struct lttng_event_field *field, | |
1990 | size_t nesting) | |
1991 | { | |
1992 | int ret; | |
1993 | const struct lttng_type *elem_type; | |
1994 | ||
65c85aa6 | 1995 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1996 | elem_type = field->type.u.array_compound.elem_type; |
1997 | switch (elem_type->atype) { | |
1998 | case atype_struct: | |
1999 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
2000 | if (ret) | |
2001 | return ret; | |
2002 | break; | |
65c85aa6 MD |
2003 | case atype_variant: |
2004 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
2005 | if (ret) | |
2006 | return ret; | |
2007 | break; | |
f513b2bf MD |
2008 | default: |
2009 | return -EINVAL; | |
2010 | } | |
2011 | ret = lttng_metadata_printf(session, | |
2012 | " _%s[%u];\n", | |
2013 | field->name, | |
2014 | field->type.u.array_compound.length); | |
2015 | return ret; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Must be called with sessions_mutex held. | |
2020 | */ | |
2021 | static | |
2022 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
2023 | const struct lttng_event_field *field, | |
2024 | size_t nesting) | |
2025 | { | |
2026 | int ret; | |
2027 | const char *length_name; | |
2028 | const struct lttng_type *elem_type; | |
2029 | ||
2030 | length_name = field->type.u.sequence_compound.length_name; | |
2031 | ||
65c85aa6 | 2032 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
2033 | elem_type = field->type.u.sequence_compound.elem_type; |
2034 | switch (elem_type->atype) { | |
2035 | case atype_struct: | |
2036 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
2037 | if (ret) | |
2038 | return ret; | |
2039 | break; | |
65c85aa6 MD |
2040 | case atype_variant: |
2041 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
2042 | if (ret) | |
2043 | return ret; | |
2044 | break; | |
f513b2bf MD |
2045 | default: |
2046 | return -EINVAL; | |
2047 | } | |
2048 | ret = lttng_metadata_printf(session, | |
2049 | " _%s[ _%s ];\n", | |
2050 | field->name, | |
2051 | length_name); | |
2052 | return ret; | |
2053 | } | |
2054 | ||
141ddf28 MD |
2055 | /* |
2056 | * Must be called with sessions_mutex held. | |
2057 | */ | |
2058 | static | |
2059 | int _lttng_enum_statedump(struct lttng_session *session, | |
2060 | const struct lttng_event_field *field, | |
2061 | size_t nesting) | |
2062 | { | |
2063 | const struct lttng_enum_desc *enum_desc; | |
2064 | const struct lttng_integer_type *container_type; | |
2065 | int ret; | |
2066 | unsigned int i, nr_entries; | |
2067 | ||
2068 | enum_desc = field->type.u.basic.enumeration.desc; | |
2069 | container_type = &field->type.u.basic.enumeration.container_type; | |
2070 | nr_entries = enum_desc->nr_entries; | |
2071 | ||
2072 | ret = print_tabs(session, nesting); | |
2073 | if (ret) | |
2074 | goto end; | |
2075 | ret = lttng_metadata_printf(session, | |
578e68ec | 2076 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
2077 | container_type->size, |
2078 | container_type->alignment, | |
2079 | container_type->signedness, | |
2080 | (container_type->encoding == lttng_encode_none) | |
2081 | ? "none" | |
2082 | : (container_type->encoding == lttng_encode_UTF8) | |
2083 | ? "UTF8" | |
2084 | : "ASCII", | |
578e68ec GB |
2085 | container_type->base, |
2086 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2087 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
2088 | #else | |
2089 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
2090 | #endif | |
2091 | ); | |
141ddf28 MD |
2092 | if (ret) |
2093 | goto end; | |
2094 | /* Dump all entries */ | |
2095 | for (i = 0; i < nr_entries; i++) { | |
2096 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2097 | int j, len; | |
2098 | ||
2099 | ret = print_tabs(session, nesting + 1); | |
2100 | if (ret) | |
2101 | goto end; | |
2102 | ret = lttng_metadata_printf(session, | |
2103 | "\""); | |
2104 | if (ret) | |
2105 | goto end; | |
2106 | len = strlen(entry->string); | |
2107 | /* Escape the character '"' */ | |
2108 | for (j = 0; j < len; j++) { | |
2109 | char c = entry->string[j]; | |
2110 | ||
2111 | switch (c) { | |
2112 | case '"': | |
2113 | ret = lttng_metadata_printf(session, | |
2114 | "\\\""); | |
2115 | break; | |
2116 | case '\\': | |
2117 | ret = lttng_metadata_printf(session, | |
2118 | "\\\\"); | |
2119 | break; | |
2120 | default: | |
2121 | ret = lttng_metadata_printf(session, | |
2122 | "%c", c); | |
2123 | break; | |
2124 | } | |
2125 | if (ret) | |
2126 | goto end; | |
2127 | } | |
08ad1061 PP |
2128 | ret = lttng_metadata_printf(session, "\""); |
2129 | if (ret) | |
2130 | goto end; | |
2131 | ||
2132 | if (entry->options.is_auto) { | |
2133 | ret = lttng_metadata_printf(session, ",\n"); | |
2134 | if (ret) | |
2135 | goto end; | |
141ddf28 | 2136 | } else { |
7c559490 MD |
2137 | ret = lttng_metadata_printf(session, |
2138 | " = "); | |
2139 | if (ret) | |
2140 | goto end; | |
2141 | if (entry->start.signedness) | |
141ddf28 | 2142 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2143 | "%lld", (long long) entry->start.value); |
2144 | else | |
2145 | ret = lttng_metadata_printf(session, | |
2146 | "%llu", entry->start.value); | |
2147 | if (ret) | |
2148 | goto end; | |
2149 | if (entry->start.signedness == entry->end.signedness && | |
2150 | entry->start.value | |
2151 | == entry->end.value) { | |
141ddf28 | 2152 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2153 | ",\n"); |
2154 | } else { | |
2155 | if (entry->end.signedness) { | |
2156 | ret = lttng_metadata_printf(session, | |
2157 | " ... %lld,\n", | |
2158 | (long long) entry->end.value); | |
2159 | } else { | |
2160 | ret = lttng_metadata_printf(session, | |
2161 | " ... %llu,\n", | |
2162 | entry->end.value); | |
2163 | } | |
141ddf28 | 2164 | } |
7c559490 MD |
2165 | if (ret) |
2166 | goto end; | |
141ddf28 | 2167 | } |
141ddf28 MD |
2168 | } |
2169 | ret = print_tabs(session, nesting); | |
2170 | if (ret) | |
2171 | goto end; | |
2172 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2173 | field->name); | |
2174 | end: | |
2175 | return ret; | |
2176 | } | |
2177 | ||
d83004aa JD |
2178 | /* |
2179 | * Must be called with sessions_mutex held. | |
2180 | */ | |
c099397a | 2181 | static |
a90917c3 | 2182 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2183 | const struct lttng_event_field *field, |
2184 | size_t nesting) | |
c099397a | 2185 | { |
c099397a | 2186 | int ret = 0; |
c099397a | 2187 | |
8070f5c0 MD |
2188 | switch (field->type.atype) { |
2189 | case atype_integer: | |
f513b2bf MD |
2190 | ret = print_tabs(session, nesting); |
2191 | if (ret) | |
2192 | return ret; | |
8070f5c0 | 2193 | ret = lttng_metadata_printf(session, |
f513b2bf | 2194 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2195 | field->type.u.basic.integer.size, |
2196 | field->type.u.basic.integer.alignment, | |
2197 | field->type.u.basic.integer.signedness, | |
2198 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2199 | ? "none" | |
2200 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2201 | ? "UTF8" | |
2202 | : "ASCII", | |
2203 | field->type.u.basic.integer.base, | |
5214fa50 | 2204 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2205 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2206 | #else |
8070f5c0 | 2207 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2208 | #endif |
8070f5c0 MD |
2209 | field->name); |
2210 | break; | |
2211 | case atype_enum: | |
141ddf28 | 2212 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2213 | break; |
2214 | case atype_array: | |
3834b99f | 2215 | case atype_array_bitfield: |
8070f5c0 MD |
2216 | { |
2217 | const struct lttng_basic_type *elem_type; | |
2218 | ||
2219 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2220 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2221 | ret = print_tabs(session, nesting); |
2222 | if (ret) | |
2223 | return ret; | |
43803cf2 | 2224 | ret = lttng_metadata_printf(session, |
f513b2bf | 2225 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2226 | field->type.u.array.elem_alignment * CHAR_BIT, |
2227 | field->name); | |
2228 | if (ret) | |
2229 | return ret; | |
2230 | } | |
f513b2bf MD |
2231 | ret = print_tabs(session, nesting); |
2232 | if (ret) | |
2233 | return ret; | |
8070f5c0 | 2234 | ret = lttng_metadata_printf(session, |
f513b2bf | 2235 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2236 | elem_type->u.basic.integer.size, |
2237 | elem_type->u.basic.integer.alignment, | |
2238 | elem_type->u.basic.integer.signedness, | |
2239 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2240 | ? "none" | |
2241 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2242 | ? "UTF8" | |
2243 | : "ASCII", | |
2244 | elem_type->u.basic.integer.base, | |
5214fa50 | 2245 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2246 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2247 | #else |
8070f5c0 | 2248 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2249 | #endif |
8070f5c0 MD |
2250 | field->name, field->type.u.array.length); |
2251 | break; | |
2252 | } | |
2253 | case atype_sequence: | |
3834b99f | 2254 | case atype_sequence_bitfield: |
8070f5c0 MD |
2255 | { |
2256 | const struct lttng_basic_type *elem_type; | |
2257 | const struct lttng_basic_type *length_type; | |
2258 | ||
2259 | elem_type = &field->type.u.sequence.elem_type; | |
2260 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2261 | ret = print_tabs(session, nesting); |
2262 | if (ret) | |
2263 | return ret; | |
8070f5c0 | 2264 | ret = lttng_metadata_printf(session, |
f513b2bf | 2265 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2266 | length_type->u.basic.integer.size, |
32257272 | 2267 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2268 | length_type->u.basic.integer.signedness, |
2269 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2270 | ? "none" | |
0635cdd4 | 2271 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2272 | ? "UTF8" |
0635cdd4 | 2273 | : "ASCII"), |
8070f5c0 | 2274 | length_type->u.basic.integer.base, |
5214fa50 | 2275 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2276 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2277 | #else |
0635cdd4 | 2278 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2279 | #endif |
27d2368e MD |
2280 | field->name); |
2281 | if (ret) | |
2282 | return ret; | |
2283 | ||
43803cf2 | 2284 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2285 | ret = print_tabs(session, nesting); |
2286 | if (ret) | |
2287 | return ret; | |
43803cf2 | 2288 | ret = lttng_metadata_printf(session, |
f513b2bf | 2289 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2290 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2291 | field->name); | |
2292 | if (ret) | |
2293 | return ret; | |
2294 | } | |
f513b2bf MD |
2295 | ret = print_tabs(session, nesting); |
2296 | if (ret) | |
2297 | return ret; | |
27d2368e | 2298 | ret = lttng_metadata_printf(session, |
f513b2bf | 2299 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2300 | elem_type->u.basic.integer.size, |
32257272 | 2301 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2302 | elem_type->u.basic.integer.signedness, |
2303 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2304 | ? "none" | |
0635cdd4 | 2305 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2306 | ? "UTF8" |
0635cdd4 | 2307 | : "ASCII"), |
8070f5c0 | 2308 | elem_type->u.basic.integer.base, |
5214fa50 | 2309 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2310 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2311 | #else |
8070f5c0 | 2312 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2313 | #endif |
8070f5c0 | 2314 | field->name, |
27d2368e | 2315 | field->name); |
8070f5c0 MD |
2316 | break; |
2317 | } | |
c099397a | 2318 | |
8070f5c0 MD |
2319 | case atype_string: |
2320 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2321 | ret = print_tabs(session, nesting); |
2322 | if (ret) | |
2323 | return ret; | |
8070f5c0 | 2324 | ret = lttng_metadata_printf(session, |
f513b2bf | 2325 | "string%s _%s;\n", |
8070f5c0 MD |
2326 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2327 | " { encoding = ASCII; }" : "", | |
2328 | field->name); | |
2329 | break; | |
f513b2bf MD |
2330 | case atype_struct: |
2331 | ret = _lttng_struct_statedump(session, field, nesting); | |
2332 | break; | |
2333 | case atype_array_compound: | |
2334 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2335 | break; | |
2336 | case atype_sequence_compound: | |
2337 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2338 | break; | |
65c85aa6 MD |
2339 | case atype_variant: |
2340 | ret = _lttng_variant_statedump(session, field, nesting); | |
2341 | break; | |
f513b2bf | 2342 | |
8070f5c0 MD |
2343 | default: |
2344 | WARN_ON_ONCE(1); | |
2345 | return -EINVAL; | |
2346 | } | |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | static | |
a90917c3 | 2351 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2352 | struct lttng_ctx *ctx) |
2353 | { | |
2354 | int ret = 0; | |
2355 | int i; | |
2356 | ||
2357 | if (!ctx) | |
2358 | return 0; | |
2359 | for (i = 0; i < ctx->nr_fields; i++) { | |
2360 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2361 | ||
f513b2bf | 2362 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2363 | if (ret) |
2364 | return ret; | |
2365 | } | |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | static | |
a90917c3 MD |
2370 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2371 | struct lttng_event *event) | |
8070f5c0 MD |
2372 | { |
2373 | const struct lttng_event_desc *desc = event->desc; | |
2374 | int ret = 0; | |
2375 | int i; | |
2376 | ||
2377 | for (i = 0; i < desc->nr_fields; i++) { | |
2378 | const struct lttng_event_field *field = &desc->fields[i]; | |
2379 | ||
f513b2bf | 2380 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2381 | if (ret) |
2382 | return ret; | |
c099397a MD |
2383 | } |
2384 | return ret; | |
2385 | } | |
2386 | ||
d83004aa JD |
2387 | /* |
2388 | * Must be called with sessions_mutex held. | |
122c63cb MD |
2389 | * The entire event metadata is printed as a single atomic metadata |
2390 | * transaction. | |
d83004aa | 2391 | */ |
c099397a | 2392 | static |
a90917c3 MD |
2393 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2394 | struct lttng_channel *chan, | |
2395 | struct lttng_event *event) | |
c099397a MD |
2396 | { |
2397 | int ret = 0; | |
2398 | ||
57ccbfa6 | 2399 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2400 | return 0; |
d83004aa | 2401 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2402 | return 0; |
2403 | ||
122c63cb MD |
2404 | lttng_metadata_begin(session); |
2405 | ||
c099397a MD |
2406 | ret = lttng_metadata_printf(session, |
2407 | "event {\n" | |
ae734547 | 2408 | " name = \"%s\";\n" |
c099397a | 2409 | " id = %u;\n" |
b9074a1b | 2410 | " stream_id = %u;\n", |
c099397a MD |
2411 | event->desc->name, |
2412 | event->id, | |
2413 | event->chan->id); | |
2414 | if (ret) | |
2415 | goto end; | |
2416 | ||
b9074a1b MD |
2417 | if (event->ctx) { |
2418 | ret = lttng_metadata_printf(session, | |
2419 | " context := struct {\n"); | |
2420 | if (ret) | |
2421 | goto end; | |
2422 | } | |
a90917c3 | 2423 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2424 | if (ret) |
2425 | goto end; | |
b9074a1b MD |
2426 | if (event->ctx) { |
2427 | ret = lttng_metadata_printf(session, | |
2428 | " };\n"); | |
2429 | if (ret) | |
2430 | goto end; | |
2431 | } | |
8070f5c0 MD |
2432 | |
2433 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2434 | " fields := struct {\n" |
2435 | ); | |
2436 | if (ret) | |
2437 | goto end; | |
2438 | ||
a90917c3 | 2439 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2440 | if (ret) |
2441 | goto end; | |
2442 | ||
2443 | /* | |
2444 | * LTTng space reservation can only reserve multiples of the | |
2445 | * byte size. | |
2446 | */ | |
2447 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2448 | " };\n" |
2449 | "};\n\n"); | |
c099397a MD |
2450 | if (ret) |
2451 | goto end; | |
2452 | ||
c099397a MD |
2453 | event->metadata_dumped = 1; |
2454 | end: | |
122c63cb | 2455 | lttng_metadata_end(session); |
c099397a MD |
2456 | return ret; |
2457 | ||
2458 | } | |
2459 | ||
d83004aa JD |
2460 | /* |
2461 | * Must be called with sessions_mutex held. | |
122c63cb MD |
2462 | * The entire channel metadata is printed as a single atomic metadata |
2463 | * transaction. | |
d83004aa | 2464 | */ |
c099397a | 2465 | static |
a90917c3 MD |
2466 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2467 | struct lttng_channel *chan) | |
c099397a MD |
2468 | { |
2469 | int ret = 0; | |
2470 | ||
57ccbfa6 | 2471 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2472 | return 0; |
d83004aa JD |
2473 | |
2474 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2475 | return 0; |
2476 | ||
122c63cb MD |
2477 | lttng_metadata_begin(session); |
2478 | ||
c099397a MD |
2479 | WARN_ON_ONCE(!chan->header_type); |
2480 | ret = lttng_metadata_printf(session, | |
2481 | "stream {\n" | |
2482 | " id = %u;\n" | |
9115fbdc | 2483 | " event.header := %s;\n" |
b9074a1b | 2484 | " packet.context := struct packet_context;\n", |
c099397a MD |
2485 | chan->id, |
2486 | chan->header_type == 1 ? "struct event_header_compact" : | |
2487 | "struct event_header_large"); | |
2488 | if (ret) | |
2489 | goto end; | |
2490 | ||
b9074a1b MD |
2491 | if (chan->ctx) { |
2492 | ret = lttng_metadata_printf(session, | |
2493 | " event.context := struct {\n"); | |
2494 | if (ret) | |
2495 | goto end; | |
2496 | } | |
a90917c3 | 2497 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2498 | if (ret) |
2499 | goto end; | |
b9074a1b MD |
2500 | if (chan->ctx) { |
2501 | ret = lttng_metadata_printf(session, | |
2502 | " };\n"); | |
2503 | if (ret) | |
2504 | goto end; | |
2505 | } | |
8070f5c0 MD |
2506 | |
2507 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2508 | "};\n\n"); |
8070f5c0 | 2509 | |
c099397a MD |
2510 | chan->metadata_dumped = 1; |
2511 | end: | |
122c63cb | 2512 | lttng_metadata_end(session); |
c099397a MD |
2513 | return ret; |
2514 | } | |
2515 | ||
d83004aa JD |
2516 | /* |
2517 | * Must be called with sessions_mutex held. | |
2518 | */ | |
9115fbdc | 2519 | static |
a90917c3 | 2520 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2521 | { |
2522 | return lttng_metadata_printf(session, | |
2523 | "struct packet_context {\n" | |
a3ccff4f MD |
2524 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2525 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2526 | " uint64_t content_size;\n" |
2527 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2528 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2529 | " unsigned long events_discarded;\n" |
9115fbdc | 2530 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2531 | "};\n\n" |
9115fbdc MD |
2532 | ); |
2533 | } | |
2534 | ||
2535 | /* | |
2536 | * Compact header: | |
2537 | * id: range: 0 - 30. | |
2538 | * id 31 is reserved to indicate an extended header. | |
2539 | * | |
2540 | * Large header: | |
2541 | * id: range: 0 - 65534. | |
2542 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2543 | * |
2544 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2545 | */ |
2546 | static | |
a90917c3 | 2547 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2548 | { |
2549 | return lttng_metadata_printf(session, | |
2550 | "struct event_header_compact {\n" | |
2551 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2552 | " variant <id> {\n" | |
2553 | " struct {\n" | |
a3ccff4f | 2554 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2555 | " } compact;\n" |
2556 | " struct {\n" | |
2557 | " uint32_t id;\n" | |
a3ccff4f | 2558 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2559 | " } extended;\n" |
2560 | " } v;\n" | |
2561 | "} align(%u);\n" | |
2562 | "\n" | |
2563 | "struct event_header_large {\n" | |
2564 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2565 | " variant <id> {\n" | |
2566 | " struct {\n" | |
a3ccff4f | 2567 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2568 | " } compact;\n" |
2569 | " struct {\n" | |
2570 | " uint32_t id;\n" | |
a3ccff4f | 2571 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2572 | " } extended;\n" |
2573 | " } v;\n" | |
2574 | "} align(%u);\n\n", | |
a90917c3 MD |
2575 | lttng_alignof(uint32_t) * CHAR_BIT, |
2576 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2577 | ); |
2578 | } | |
2579 | ||
a3ccff4f MD |
2580 | /* |
2581 | * Approximation of NTP time of day to clock monotonic correlation, | |
2582 | * taken at start of trace. | |
2583 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2584 | * in future versions. | |
5283350b MD |
2585 | * This function may return a negative offset. It may happen if the |
2586 | * system sets the REALTIME clock to 0 after boot. | |
72dc372e MJ |
2587 | * |
2588 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2589 | * y2038 compliant. | |
a3ccff4f MD |
2590 | */ |
2591 | static | |
8967b2a3 | 2592 | int64_t measure_clock_offset(void) |
a3ccff4f | 2593 | { |
dcb93448 | 2594 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2595 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2596 | int64_t offset; |
a3ccff4f | 2597 | unsigned long flags; |
72dc372e MJ |
2598 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2599 | struct timespec64 rts = { 0, 0 }; | |
2600 | #else | |
2601 | struct timespec rts = { 0, 0 }; | |
2602 | #endif | |
a3ccff4f MD |
2603 | |
2604 | /* Disable interrupts to increase correlation precision. */ | |
2605 | local_irq_save(flags); | |
2606 | monotonic[0] = trace_clock_read64(); | |
72dc372e MJ |
2607 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2608 | ktime_get_real_ts64(&rts); | |
2609 | #else | |
216b6baa | 2610 | getnstimeofday(&rts); |
72dc372e | 2611 | #endif |
a3ccff4f MD |
2612 | monotonic[1] = trace_clock_read64(); |
2613 | local_irq_restore(flags); | |
2614 | ||
dcb93448 | 2615 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2616 | realtime = (uint64_t) rts.tv_sec * tcf; |
2617 | if (tcf == NSEC_PER_SEC) { | |
2618 | realtime += rts.tv_nsec; | |
2619 | } else { | |
2620 | uint64_t n = rts.tv_nsec * tcf; | |
2621 | ||
2622 | do_div(n, NSEC_PER_SEC); | |
2623 | realtime += n; | |
2624 | } | |
dcb93448 | 2625 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2626 | return offset; |
2627 | } | |
2628 | ||
3eb95be4 JR |
2629 | static |
2630 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2631 | { | |
ae457be2 | 2632 | int ret = 0; |
3eb95be4 JR |
2633 | size_t i; |
2634 | char cur; | |
2635 | ||
2636 | i = 0; | |
2637 | cur = string[i]; | |
2638 | while (cur != '\0') { | |
2639 | switch (cur) { | |
2640 | case '\n': | |
2641 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2642 | break; | |
2643 | case '\\': | |
2644 | case '"': | |
2645 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2646 | if (ret) | |
2647 | goto error; | |
2648 | /* We still print the current char */ | |
2649 | /* Fallthrough */ | |
2650 | default: | |
2651 | ret = lttng_metadata_printf(session, "%c", cur); | |
2652 | break; | |
2653 | } | |
2654 | ||
2655 | if (ret) | |
2656 | goto error; | |
2657 | ||
2658 | cur = string[++i]; | |
2659 | } | |
2660 | error: | |
2661 | return ret; | |
2662 | } | |
2663 | ||
2664 | static | |
1c88f269 JR |
2665 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2666 | const char *field_value) | |
3eb95be4 JR |
2667 | { |
2668 | int ret; | |
2669 | ||
1c88f269 | 2670 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2671 | if (ret) |
2672 | goto error; | |
2673 | ||
1c88f269 | 2674 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2675 | if (ret) |
2676 | goto error; | |
2677 | ||
2678 | ret = lttng_metadata_printf(session, "\";\n"); | |
2679 | ||
2680 | error: | |
2681 | return ret; | |
2682 | } | |
2683 | ||
c099397a MD |
2684 | /* |
2685 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2686 | * Must be called with sessions_mutex held. |
c099397a MD |
2687 | */ |
2688 | static | |
a90917c3 | 2689 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2690 | { |
30bdb6e4 | 2691 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2692 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2693 | const char *product_uuid; |
a90917c3 MD |
2694 | struct lttng_channel *chan; |
2695 | struct lttng_event *event; | |
c099397a MD |
2696 | int ret = 0; |
2697 | ||
57ccbfa6 | 2698 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 2699 | return 0; |
122c63cb MD |
2700 | |
2701 | lttng_metadata_begin(session); | |
2702 | ||
c099397a MD |
2703 | if (session->metadata_dumped) |
2704 | goto skip_session; | |
c099397a | 2705 | |
d793d5e1 | 2706 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2707 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2708 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2709 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2710 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2711 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2712 | |
2713 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2714 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2715 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2716 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2717 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2718 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2719 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2720 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2721 | "\n" |
2722 | "trace {\n" | |
2723 | " major = %u;\n" | |
2724 | " minor = %u;\n" | |
30bdb6e4 | 2725 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2726 | " byte_order = %s;\n" |
2727 | " packet.header := struct {\n" | |
2728 | " uint32_t magic;\n" | |
1ec3f75a | 2729 | " uint8_t uuid[16];\n" |
d793d5e1 | 2730 | " uint32_t stream_id;\n" |
5594698f | 2731 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2732 | " };\n" |
d793d5e1 | 2733 | "};\n\n", |
a90917c3 MD |
2734 | lttng_alignof(uint8_t) * CHAR_BIT, |
2735 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2736 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2737 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2738 | sizeof(unsigned long) * CHAR_BIT, |
2739 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2740 | CTF_SPEC_MAJOR, |
2741 | CTF_SPEC_MINOR, | |
d793d5e1 | 2742 | uuid_s, |
5214fa50 | 2743 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2744 | "be" |
2745 | #else | |
2746 | "le" | |
2747 | #endif | |
2748 | ); | |
2749 | if (ret) | |
2750 | goto end; | |
2751 | ||
99dc9597 MD |
2752 | ret = lttng_metadata_printf(session, |
2753 | "env {\n" | |
a6058143 | 2754 | " hostname = \"%s\";\n" |
c6c9e10f | 2755 | " domain = \"kernel\";\n" |
99dc9597 | 2756 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2757 | " kernel_release = \"%s\";\n" |
2758 | " kernel_version = \"%s\";\n" | |
2759 | " tracer_name = \"lttng-modules\";\n" | |
2760 | " tracer_major = %d;\n" | |
2761 | " tracer_minor = %d;\n" | |
2762 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2763 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2764 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2765 | utsname()->sysname, |
2766 | utsname()->release, | |
c6c9e10f MD |
2767 | utsname()->version, |
2768 | LTTNG_MODULES_MAJOR_VERSION, | |
2769 | LTTNG_MODULES_MINOR_VERSION, | |
2770 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2771 | ); |
2772 | if (ret) | |
2773 | goto end; | |
2774 | ||
1c88f269 JR |
2775 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2776 | if (ret) | |
2777 | goto end; | |
2778 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2779 | session->creation_time); | |
3eb95be4 JR |
2780 | if (ret) |
2781 | goto end; | |
2782 | ||
c88f762e GB |
2783 | /* Add the product UUID to the 'env' section */ |
2784 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2785 | if (product_uuid) { | |
2786 | ret = lttng_metadata_printf(session, | |
2787 | " product_uuid = \"%s\";\n", | |
2788 | product_uuid | |
2789 | ); | |
2790 | if (ret) | |
2791 | goto end; | |
2792 | } | |
2793 | ||
2794 | /* Close the 'env' section */ | |
3eb95be4 JR |
2795 | ret = lttng_metadata_printf(session, "};\n\n"); |
2796 | if (ret) | |
2797 | goto end; | |
2798 | ||
a3ccff4f MD |
2799 | ret = lttng_metadata_printf(session, |
2800 | "clock {\n" | |
2754583e MD |
2801 | " name = \"%s\";\n", |
2802 | trace_clock_name() | |
a82c63f1 MD |
2803 | ); |
2804 | if (ret) | |
2805 | goto end; | |
2806 | ||
2807 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2808 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2809 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2810 | clock_uuid_s |
2811 | ); | |
2812 | if (ret) | |
2813 | goto end; | |
2814 | } | |
2815 | ||
2816 | ret = lttng_metadata_printf(session, | |
2754583e | 2817 | " description = \"%s\";\n" |
a3ccff4f MD |
2818 | " freq = %llu; /* Frequency, in Hz */\n" |
2819 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2820 | " offset = %lld;\n" |
a3ccff4f | 2821 | "};\n\n", |
2754583e | 2822 | trace_clock_description(), |
a3ccff4f | 2823 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2824 | (long long) measure_clock_offset() |
a3ccff4f MD |
2825 | ); |
2826 | if (ret) | |
2827 | goto end; | |
2828 | ||
2829 | ret = lttng_metadata_printf(session, | |
2830 | "typealias integer {\n" | |
2831 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2832 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2833 | "} := uint27_clock_monotonic_t;\n" |
2834 | "\n" | |
2835 | "typealias integer {\n" | |
2836 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2837 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2838 | "} := uint32_clock_monotonic_t;\n" |
2839 | "\n" | |
2840 | "typealias integer {\n" | |
2841 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2842 | " map = clock.%s.value;\n" |
a3ccff4f | 2843 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2844 | trace_clock_name(), |
a3ccff4f | 2845 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2846 | trace_clock_name(), |
2847 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2848 | trace_clock_name() | |
a3ccff4f MD |
2849 | ); |
2850 | if (ret) | |
2851 | goto end; | |
2852 | ||
a90917c3 | 2853 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2854 | if (ret) |
2855 | goto end; | |
2856 | ||
a90917c3 | 2857 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2858 | if (ret) |
2859 | goto end; | |
2860 | ||
c099397a MD |
2861 | skip_session: |
2862 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2863 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2864 | if (ret) |
2865 | goto end; | |
2866 | } | |
2867 | ||
2868 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2869 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2870 | if (ret) |
2871 | goto end; | |
2872 | } | |
2873 | session->metadata_dumped = 1; | |
2874 | end: | |
122c63cb | 2875 | lttng_metadata_end(session); |
c099397a MD |
2876 | return ret; |
2877 | } | |
2878 | ||
c0e31d2e | 2879 | /** |
a90917c3 | 2880 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2881 | * @transport: transport structure |
2882 | * | |
2883 | * Registers a transport which can be used as output to extract the data out of | |
2884 | * LTTng. The module calling this registration function must ensure that no | |
2885 | * trap-inducing code will be executed by the transport functions. E.g. | |
ea53823c | 2886 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 2887 | * is made visible to the transport function. This registration acts as a |
ea53823c | 2888 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
2889 | * after its registration must it synchronize the TLBs. |
2890 | */ | |
a90917c3 | 2891 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2892 | { |
2893 | /* | |
2894 | * Make sure no page fault can be triggered by the module about to be | |
2895 | * registered. We deal with this here so we don't have to call | |
ea53823c | 2896 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 2897 | */ |
ea53823c | 2898 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
2899 | |
2900 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2901 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2902 | mutex_unlock(&sessions_mutex); |
2903 | } | |
a90917c3 | 2904 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2905 | |
2906 | /** | |
a90917c3 | 2907 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2908 | * @transport: transport structure |
2909 | */ | |
a90917c3 | 2910 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2911 | { |
2912 | mutex_lock(&sessions_mutex); | |
2913 | list_del(&transport->node); | |
2914 | mutex_unlock(&sessions_mutex); | |
2915 | } | |
a90917c3 | 2916 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2917 | |
2d042821 | 2918 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2919 | |
2920 | enum cpuhp_state lttng_hp_prepare; | |
2921 | enum cpuhp_state lttng_hp_online; | |
2922 | ||
2923 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2924 | { | |
2925 | struct lttng_cpuhp_node *lttng_node; | |
2926 | ||
2927 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2928 | switch (lttng_node->component) { | |
2929 | case LTTNG_RING_BUFFER_FRONTEND: | |
2930 | return 0; | |
2931 | case LTTNG_RING_BUFFER_BACKEND: | |
2932 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2933 | case LTTNG_RING_BUFFER_ITER: | |
2934 | return 0; | |
2935 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2936 | return 0; | |
2937 | default: | |
2938 | return -EINVAL; | |
2939 | } | |
2940 | } | |
2941 | ||
2942 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2943 | { | |
2944 | struct lttng_cpuhp_node *lttng_node; | |
2945 | ||
2946 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2947 | switch (lttng_node->component) { | |
2948 | case LTTNG_RING_BUFFER_FRONTEND: | |
2949 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2950 | case LTTNG_RING_BUFFER_BACKEND: | |
2951 | return 0; | |
2952 | case LTTNG_RING_BUFFER_ITER: | |
2953 | return 0; | |
2954 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2955 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2956 | default: | |
2957 | return -EINVAL; | |
2958 | } | |
2959 | } | |
2960 | ||
2961 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2962 | { | |
2963 | struct lttng_cpuhp_node *lttng_node; | |
2964 | ||
2965 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2966 | switch (lttng_node->component) { | |
2967 | case LTTNG_RING_BUFFER_FRONTEND: | |
2968 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2969 | case LTTNG_RING_BUFFER_BACKEND: | |
2970 | return 0; | |
2971 | case LTTNG_RING_BUFFER_ITER: | |
2972 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2973 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2974 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2975 | default: | |
2976 | return -EINVAL; | |
2977 | } | |
2978 | } | |
2979 | ||
2980 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2981 | { | |
2982 | struct lttng_cpuhp_node *lttng_node; | |
2983 | ||
2984 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2985 | switch (lttng_node->component) { | |
2986 | case LTTNG_RING_BUFFER_FRONTEND: | |
2987 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2988 | case LTTNG_RING_BUFFER_BACKEND: | |
2989 | return 0; | |
2990 | case LTTNG_RING_BUFFER_ITER: | |
2991 | return 0; | |
2992 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2993 | return 0; | |
2994 | default: | |
2995 | return -EINVAL; | |
2996 | } | |
2997 | } | |
2998 | ||
2999 | static int __init lttng_init_cpu_hotplug(void) | |
3000 | { | |
3001 | int ret; | |
3002 | ||
3003 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3004 | lttng_hotplug_prepare, | |
3005 | lttng_hotplug_dead); | |
3006 | if (ret < 0) { | |
3007 | return ret; | |
3008 | } | |
3009 | lttng_hp_prepare = ret; | |
3010 | lttng_rb_set_hp_prepare(ret); | |
3011 | ||
3012 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3013 | lttng_hotplug_online, | |
3014 | lttng_hotplug_offline); | |
3015 | if (ret < 0) { | |
3016 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3017 | lttng_hp_prepare = 0; | |
3018 | return ret; | |
3019 | } | |
3020 | lttng_hp_online = ret; | |
3021 | lttng_rb_set_hp_online(ret); | |
3022 | ||
3023 | return 0; | |
3024 | } | |
3025 | ||
3026 | static void __exit lttng_exit_cpu_hotplug(void) | |
3027 | { | |
3028 | lttng_rb_set_hp_online(0); | |
3029 | cpuhp_remove_multi_state(lttng_hp_online); | |
3030 | lttng_rb_set_hp_prepare(0); | |
3031 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3032 | } | |
3033 | ||
2d042821 | 3034 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3035 | static int lttng_init_cpu_hotplug(void) |
3036 | { | |
3037 | return 0; | |
3038 | } | |
3039 | static void lttng_exit_cpu_hotplug(void) | |
3040 | { | |
3041 | } | |
2d042821 | 3042 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3043 | |
3044 | ||
a90917c3 | 3045 | static int __init lttng_events_init(void) |
4e3c1b9b | 3046 | { |
1c25284c MD |
3047 | int ret; |
3048 | ||
453b2495 JD |
3049 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3050 | if (ret) | |
3051 | return ret; | |
389d7070 | 3052 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3053 | if (ret) |
3054 | return ret; | |
3055 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3056 | if (ret) |
3057 | return ret; | |
3058 | ret = lttng_probes_init(); | |
389d7070 MD |
3059 | if (ret) |
3060 | return ret; | |
07dfc1d0 | 3061 | ret = lttng_context_init(); |
20591cf7 MD |
3062 | if (ret) |
3063 | return ret; | |
07dfc1d0 MD |
3064 | ret = lttng_tracepoint_init(); |
3065 | if (ret) | |
3066 | goto error_tp; | |
a90917c3 | 3067 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3068 | if (!event_cache) { |
3069 | ret = -ENOMEM; | |
3070 | goto error_kmem; | |
3071 | } | |
80996790 | 3072 | ret = lttng_abi_init(); |
02119ee5 MD |
3073 | if (ret) |
3074 | goto error_abi; | |
0c956676 MD |
3075 | ret = lttng_logger_init(); |
3076 | if (ret) | |
3077 | goto error_logger; | |
1e367326 MD |
3078 | ret = lttng_init_cpu_hotplug(); |
3079 | if (ret) | |
3080 | goto error_hotplug; | |
101215b7 | 3081 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3082 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3083 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3084 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3085 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3086 | LTTNG_VERSION_NAME, |
3087 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3088 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3089 | #else | |
3090 | "", | |
3091 | #endif | |
3092 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3093 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3094 | #else | |
3095 | ""); | |
3096 | #endif | |
4e3c1b9b | 3097 | return 0; |
0c956676 | 3098 | |
1e367326 MD |
3099 | error_hotplug: |
3100 | lttng_logger_exit(); | |
0c956676 MD |
3101 | error_logger: |
3102 | lttng_abi_exit(); | |
02119ee5 | 3103 | error_abi: |
1c25284c | 3104 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3105 | error_kmem: |
3106 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3107 | error_tp: |
3108 | lttng_context_exit(); | |
101215b7 | 3109 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3110 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3111 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3112 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3113 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3114 | LTTNG_VERSION_NAME, |
3115 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3116 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3117 | #else | |
3118 | "", | |
3119 | #endif | |
3120 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3121 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3122 | #else | |
3123 | ""); | |
3124 | #endif | |
1c25284c | 3125 | return ret; |
4e3c1b9b MD |
3126 | } |
3127 | ||
a90917c3 | 3128 | module_init(lttng_events_init); |
11b5a3c2 | 3129 | |
a90917c3 | 3130 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3131 | { |
a90917c3 | 3132 | struct lttng_session *session, *tmpsession; |
92e94819 | 3133 | |
1e367326 | 3134 | lttng_exit_cpu_hotplug(); |
0c956676 | 3135 | lttng_logger_exit(); |
80996790 | 3136 | lttng_abi_exit(); |
92e94819 | 3137 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3138 | lttng_session_destroy(session); |
11b5a3c2 | 3139 | kmem_cache_destroy(event_cache); |
20591cf7 | 3140 | lttng_tracepoint_exit(); |
07dfc1d0 | 3141 | lttng_context_exit(); |
101215b7 | 3142 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3143 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3144 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3145 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3146 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3147 | LTTNG_VERSION_NAME, |
3148 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3149 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3150 | #else | |
3151 | "", | |
3152 | #endif | |
3153 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3154 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3155 | #else | |
3156 | ""); | |
3157 | #endif | |
4e3c1b9b | 3158 | } |
92e94819 | 3159 | |
a90917c3 | 3160 | module_exit(lttng_events_exit); |
11b5a3c2 | 3161 | |
101215b7 MJ |
3162 | #include "extra_version/patches.i" |
3163 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3164 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3165 | #endif | |
3166 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3167 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3168 | #endif | |
92e94819 MD |
3169 | MODULE_LICENSE("GPL and additional rights"); |
3170 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3171 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3172 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3173 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3174 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3175 | LTTNG_MODULES_EXTRAVERSION); |