Commit | Line | Data |
---|---|---|
4e3c1b9b | 1 | /* |
a90917c3 | 2 | * lttng-events.c |
4e3c1b9b | 3 | * |
4e3c1b9b | 4 | * Holds LTTng per-session event registry. |
17baffe2 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
4e3c1b9b MD |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
c0e31d2e MD |
24 | #include <linux/list.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/sched.h> | |
11b5a3c2 | 27 | #include <linux/slab.h> |
c099397a | 28 | #include <linux/jiffies.h> |
99dc9597 | 29 | #include <linux/utsname.h> |
abc0446a | 30 | #include <linux/err.h> |
a864fb02 | 31 | #include "wrapper/uuid.h" |
b13f3ebe | 32 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
a82c63f1 | 33 | #include "wrapper/random.h" |
3a523f5b | 34 | #include "wrapper/tracepoint.h" |
b8590f40 | 35 | #include "lttng-kernel-version.h" |
a90917c3 MD |
36 | #include "lttng-events.h" |
37 | #include "lttng-tracer.h" | |
6dccd6c1 | 38 | #include "lttng-abi-old.h" |
4e3c1b9b | 39 | |
d83004aa JD |
40 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
41 | ||
4e3c1b9b | 42 | static LIST_HEAD(sessions); |
a90917c3 | 43 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
44 | /* |
45 | * Protect the sessions and metadata caches. | |
46 | */ | |
4e3c1b9b MD |
47 | static DEFINE_MUTEX(sessions_mutex); |
48 | static struct kmem_cache *event_cache; | |
49 | ||
a90917c3 MD |
50 | static void _lttng_event_destroy(struct lttng_event *event); |
51 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
52 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 53 | static |
a90917c3 MD |
54 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
55 | struct lttng_channel *chan, | |
56 | struct lttng_event *event); | |
c099397a | 57 | static |
a90917c3 | 58 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
59 | static |
60 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 61 | |
c099397a | 62 | void synchronize_trace(void) |
abcca994 MD |
63 | { |
64 | synchronize_sched(); | |
b8590f40 MD |
65 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
66 | #ifdef CONFIG_PREEMPT_RT_FULL | |
67 | synchronize_rcu(); | |
68 | #endif | |
69 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
70 | #ifdef CONFIG_PREEMPT_RT |
71 | synchronize_rcu(); | |
72 | #endif | |
b8590f40 | 73 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
74 | } |
75 | ||
a90917c3 | 76 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 77 | { |
a90917c3 | 78 | struct lttng_session *session; |
d83004aa | 79 | struct lttng_metadata_cache *metadata_cache; |
4e3c1b9b MD |
80 | |
81 | mutex_lock(&sessions_mutex); | |
a90917c3 | 82 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 83 | if (!session) |
d83004aa | 84 | goto err; |
4e3c1b9b | 85 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 86 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 87 | uuid_le_gen(&session->uuid); |
d83004aa JD |
88 | |
89 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
90 | GFP_KERNEL); | |
91 | if (!metadata_cache) | |
92 | goto err_free_session; | |
93 | metadata_cache->data = kzalloc(METADATA_CACHE_DEFAULT_SIZE, | |
94 | GFP_KERNEL); | |
95 | if (!metadata_cache->data) | |
96 | goto err_free_cache; | |
97 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
98 | kref_init(&metadata_cache->refcount); | |
99 | session->metadata_cache = metadata_cache; | |
100 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
9b8e91ac MD |
101 | memcpy(&metadata_cache->uuid, &session->uuid, |
102 | sizeof(metadata_cache->uuid)); | |
4e3c1b9b MD |
103 | list_add(&session->list, &sessions); |
104 | mutex_unlock(&sessions_mutex); | |
105 | return session; | |
d83004aa JD |
106 | |
107 | err_free_cache: | |
108 | kfree(metadata_cache); | |
109 | err_free_session: | |
110 | kfree(session); | |
111 | err: | |
112 | mutex_unlock(&sessions_mutex); | |
113 | return NULL; | |
114 | } | |
115 | ||
116 | void metadata_cache_destroy(struct kref *kref) | |
117 | { | |
118 | struct lttng_metadata_cache *cache = | |
119 | container_of(kref, struct lttng_metadata_cache, refcount); | |
120 | kfree(cache->data); | |
121 | kfree(cache); | |
4e3c1b9b MD |
122 | } |
123 | ||
a90917c3 | 124 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 125 | { |
a90917c3 MD |
126 | struct lttng_channel *chan, *tmpchan; |
127 | struct lttng_event *event, *tmpevent; | |
d83004aa | 128 | struct lttng_metadata_stream *metadata_stream; |
dda6a249 | 129 | int ret; |
4e3c1b9b MD |
130 | |
131 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 132 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
133 | list_for_each_entry(chan, &session->chan, list) { |
134 | ret = lttng_syscalls_unregister(chan); | |
135 | WARN_ON(ret); | |
136 | } | |
dda6a249 | 137 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 138 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
139 | WARN_ON(ret); |
140 | } | |
abcca994 | 141 | synchronize_trace(); /* Wait for in-flight events to complete */ |
4e3c1b9b | 142 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 143 | _lttng_event_destroy(event); |
d83004aa JD |
144 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
145 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 146 | _lttng_channel_destroy(chan); |
d83004aa JD |
147 | } |
148 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
149 | _lttng_metadata_channel_hangup(metadata_stream); | |
150 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); | |
4e3c1b9b MD |
151 | list_del(&session->list); |
152 | mutex_unlock(&sessions_mutex); | |
153 | kfree(session); | |
154 | } | |
155 | ||
a90917c3 | 156 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
157 | { |
158 | int ret = 0; | |
a90917c3 | 159 | struct lttng_channel *chan; |
c0e31d2e MD |
160 | |
161 | mutex_lock(&sessions_mutex); | |
162 | if (session->active) { | |
163 | ret = -EBUSY; | |
164 | goto end; | |
165 | } | |
c099397a MD |
166 | |
167 | /* | |
168 | * Snapshot the number of events per channel to know the type of header | |
169 | * we need to use. | |
170 | */ | |
171 | list_for_each_entry(chan, &session->chan, list) { | |
172 | if (chan->header_type) | |
173 | continue; /* don't change it if session stop/restart */ | |
174 | if (chan->free_event_id < 31) | |
175 | chan->header_type = 1; /* compact */ | |
176 | else | |
177 | chan->header_type = 2; /* large */ | |
178 | } | |
179 | ||
52fc2e1f | 180 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 181 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 182 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
183 | if (ret) { |
184 | ACCESS_ONCE(session->active) = 0; | |
185 | goto end; | |
186 | } | |
187 | ret = lttng_statedump_start(session); | |
360f38ea | 188 | if (ret) |
c099397a | 189 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
190 | end: |
191 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 192 | return ret; |
c0e31d2e MD |
193 | } |
194 | ||
a90917c3 | 195 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
196 | { |
197 | int ret = 0; | |
198 | ||
199 | mutex_lock(&sessions_mutex); | |
200 | if (!session->active) { | |
201 | ret = -EBUSY; | |
202 | goto end; | |
203 | } | |
52fc2e1f | 204 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
205 | end: |
206 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 207 | return ret; |
c0e31d2e MD |
208 | } |
209 | ||
a90917c3 | 210 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da MD |
211 | { |
212 | int old; | |
213 | ||
d83004aa | 214 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 215 | return -EPERM; |
e64957da MD |
216 | old = xchg(&channel->enabled, 1); |
217 | if (old) | |
218 | return -EEXIST; | |
219 | return 0; | |
220 | } | |
221 | ||
a90917c3 | 222 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da MD |
223 | { |
224 | int old; | |
225 | ||
d83004aa | 226 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 227 | return -EPERM; |
e64957da MD |
228 | old = xchg(&channel->enabled, 0); |
229 | if (!old) | |
230 | return -EEXIST; | |
231 | return 0; | |
232 | } | |
233 | ||
a90917c3 | 234 | int lttng_event_enable(struct lttng_event *event) |
e64957da MD |
235 | { |
236 | int old; | |
237 | ||
d83004aa | 238 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 239 | return -EPERM; |
e64957da MD |
240 | old = xchg(&event->enabled, 1); |
241 | if (old) | |
242 | return -EEXIST; | |
243 | return 0; | |
244 | } | |
245 | ||
a90917c3 | 246 | int lttng_event_disable(struct lttng_event *event) |
e64957da MD |
247 | { |
248 | int old; | |
249 | ||
d83004aa | 250 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 251 | return -EPERM; |
e64957da MD |
252 | old = xchg(&event->enabled, 0); |
253 | if (!old) | |
254 | return -EEXIST; | |
255 | return 0; | |
256 | } | |
257 | ||
a90917c3 | 258 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 259 | { |
a90917c3 | 260 | struct lttng_transport *transport; |
f3d01b96 | 261 | |
a90917c3 | 262 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
263 | if (!strcmp(transport->name, name)) |
264 | return transport; | |
265 | } | |
266 | return NULL; | |
267 | } | |
268 | ||
a90917c3 | 269 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
270 | const char *transport_name, |
271 | void *buf_addr, | |
4e3c1b9b MD |
272 | size_t subbuf_size, size_t num_subbuf, |
273 | unsigned int switch_timer_interval, | |
d83004aa JD |
274 | unsigned int read_timer_interval, |
275 | enum channel_type channel_type) | |
4e3c1b9b | 276 | { |
a90917c3 MD |
277 | struct lttng_channel *chan; |
278 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
279 | |
280 | mutex_lock(&sessions_mutex); | |
d83004aa | 281 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 282 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 283 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
284 | if (!transport) { |
285 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
286 | transport_name); | |
c0e31d2e | 287 | goto notransport; |
f3d01b96 | 288 | } |
a33c9927 MD |
289 | if (!try_module_get(transport->owner)) { |
290 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
291 | goto notransport; | |
292 | } | |
a90917c3 | 293 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 294 | if (!chan) |
c0e31d2e | 295 | goto nomem; |
4e3c1b9b | 296 | chan->session = session; |
05d32c64 | 297 | chan->id = session->free_chan_id++; |
3b731ab1 | 298 | chan->ops = &transport->ops; |
125b4df4 MD |
299 | /* |
300 | * Note: the channel creation op already writes into the packet | |
301 | * headers. Therefore the "chan" information used as input | |
302 | * should be already accessible. | |
303 | */ | |
5f5ddf01 MD |
304 | chan->chan = transport->ops.channel_create(transport_name, |
305 | chan, buf_addr, subbuf_size, num_subbuf, | |
306 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
307 | if (!chan->chan) |
308 | goto create_error; | |
e64957da | 309 | chan->enabled = 1; |
a33c9927 | 310 | chan->transport = transport; |
d83004aa | 311 | chan->channel_type = channel_type; |
4e3c1b9b MD |
312 | list_add(&chan->list, &session->chan); |
313 | mutex_unlock(&sessions_mutex); | |
314 | return chan; | |
315 | ||
f3d01b96 MD |
316 | create_error: |
317 | kfree(chan); | |
c0e31d2e | 318 | nomem: |
a33c9927 MD |
319 | if (transport) |
320 | module_put(transport->owner); | |
c0e31d2e | 321 | notransport: |
e5382b6d | 322 | active: |
4e3c1b9b MD |
323 | mutex_unlock(&sessions_mutex); |
324 | return NULL; | |
325 | } | |
326 | ||
327 | /* | |
d83004aa JD |
328 | * Only used internally at session destruction for per-cpu channels, and |
329 | * when metadata channel is released. | |
330 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 331 | */ |
aa7c23a9 | 332 | static |
a90917c3 | 333 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 334 | { |
11b5a3c2 | 335 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 336 | module_put(chan->transport->owner); |
4e3c1b9b | 337 | list_del(&chan->list); |
8070f5c0 | 338 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
339 | kfree(chan); |
340 | } | |
341 | ||
d83004aa JD |
342 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
343 | { | |
344 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
345 | ||
346 | /* Protect the metadata cache with the sessions_mutex. */ | |
347 | mutex_lock(&sessions_mutex); | |
348 | _lttng_channel_destroy(chan); | |
349 | mutex_unlock(&sessions_mutex); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
352 | ||
353 | static | |
354 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
355 | { | |
356 | stream->finalized = 1; | |
357 | wake_up_interruptible(&stream->read_wait); | |
358 | } | |
359 | ||
e5382b6d MD |
360 | /* |
361 | * Supports event creation while tracing session is active. | |
362 | */ | |
a90917c3 | 363 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
d6d808f3 | 364 | struct lttng_kernel_event *event_param, |
259b6cb3 MD |
365 | void *filter, |
366 | const struct lttng_event_desc *internal_desc) | |
4e3c1b9b | 367 | { |
a90917c3 | 368 | struct lttng_event *event; |
3d084699 | 369 | int ret; |
4e3c1b9b MD |
370 | |
371 | mutex_lock(&sessions_mutex); | |
abc0446a | 372 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 373 | ret = -EMFILE; |
e5382b6d | 374 | goto full; |
abc0446a | 375 | } |
4e3c1b9b | 376 | /* |
dda6a249 MD |
377 | * This is O(n^2) (for each event, the loop is called at event |
378 | * creation). Might require a hash if we have lots of events. | |
4e3c1b9b | 379 | */ |
abc0446a MD |
380 | list_for_each_entry(event, &chan->session->events, list) { |
381 | if (!strcmp(event->desc->name, event_param->name)) { | |
4cf0bf51 | 382 | ret = -EEXIST; |
4e3c1b9b | 383 | goto exist; |
abc0446a MD |
384 | } |
385 | } | |
11b5a3c2 | 386 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 387 | if (!event) { |
4cf0bf51 | 388 | ret = -ENOMEM; |
4e3c1b9b | 389 | goto cache_error; |
abc0446a | 390 | } |
4e3c1b9b MD |
391 | event->chan = chan; |
392 | event->filter = filter; | |
e5382b6d | 393 | event->id = chan->free_event_id++; |
e64957da | 394 | event->enabled = 1; |
d6d808f3 | 395 | event->instrumentation = event_param->instrumentation; |
a90917c3 | 396 | /* Populate lttng_event structure before tracepoint registration. */ |
e5382b6d | 397 | smp_wmb(); |
d6d808f3 | 398 | switch (event_param->instrumentation) { |
ab2277d6 | 399 | case LTTNG_KERNEL_TRACEPOINT: |
a90917c3 | 400 | event->desc = lttng_event_get(event_param->name); |
abc0446a | 401 | if (!event->desc) { |
4cf0bf51 | 402 | ret = -ENOENT; |
d3dbe23c | 403 | goto register_error; |
abc0446a | 404 | } |
20591cf7 | 405 | ret = lttng_wrapper_tracepoint_probe_register(event->desc->kname, |
d3dbe23c MD |
406 | event->desc->probe_callback, |
407 | event); | |
abc0446a | 408 | if (ret) { |
4cf0bf51 | 409 | ret = -EINVAL; |
11b5a3c2 | 410 | goto register_error; |
abc0446a | 411 | } |
baf20995 | 412 | break; |
ab2277d6 | 413 | case LTTNG_KERNEL_KPROBE: |
30bdb6e4 | 414 | ret = lttng_kprobes_register(event_param->name, |
f17701fb MD |
415 | event_param->u.kprobe.symbol_name, |
416 | event_param->u.kprobe.offset, | |
417 | event_param->u.kprobe.addr, | |
418 | event); | |
abc0446a | 419 | if (ret) { |
4cf0bf51 | 420 | ret = -EINVAL; |
d6d808f3 | 421 | goto register_error; |
abc0446a | 422 | } |
edeb3137 MD |
423 | ret = try_module_get(event->desc->owner); |
424 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 425 | break; |
7371f44c MD |
426 | case LTTNG_KERNEL_KRETPROBE: |
427 | { | |
a90917c3 | 428 | struct lttng_event *event_return; |
7371f44c MD |
429 | |
430 | /* kretprobe defines 2 events */ | |
431 | event_return = | |
432 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 433 | if (!event_return) { |
4cf0bf51 | 434 | ret = -ENOMEM; |
7371f44c | 435 | goto register_error; |
abc0446a | 436 | } |
7371f44c MD |
437 | event_return->chan = chan; |
438 | event_return->filter = filter; | |
439 | event_return->id = chan->free_event_id++; | |
440 | event_return->enabled = 1; | |
441 | event_return->instrumentation = event_param->instrumentation; | |
442 | /* | |
a90917c3 | 443 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
444 | */ |
445 | smp_wmb(); | |
446 | ret = lttng_kretprobes_register(event_param->name, | |
447 | event_param->u.kretprobe.symbol_name, | |
448 | event_param->u.kretprobe.offset, | |
449 | event_param->u.kretprobe.addr, | |
450 | event, event_return); | |
451 | if (ret) { | |
452 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 453 | ret = -EINVAL; |
7371f44c MD |
454 | goto register_error; |
455 | } | |
456 | /* Take 2 refs on the module: one per event. */ | |
457 | ret = try_module_get(event->desc->owner); | |
458 | WARN_ON_ONCE(!ret); | |
459 | ret = try_module_get(event->desc->owner); | |
460 | WARN_ON_ONCE(!ret); | |
a90917c3 | 461 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 462 | event_return); |
abc0446a | 463 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
464 | if (ret) { |
465 | kmem_cache_free(event_cache, event_return); | |
466 | module_put(event->desc->owner); | |
467 | module_put(event->desc->owner); | |
468 | goto statedump_error; | |
469 | } | |
470 | list_add(&event_return->list, &chan->session->events); | |
471 | break; | |
472 | } | |
ab2277d6 | 473 | case LTTNG_KERNEL_FUNCTION: |
30bdb6e4 | 474 | ret = lttng_ftrace_register(event_param->name, |
e0a7a7c4 MD |
475 | event_param->u.ftrace.symbol_name, |
476 | event); | |
abc0446a | 477 | if (ret) { |
e0a7a7c4 | 478 | goto register_error; |
abc0446a | 479 | } |
edeb3137 MD |
480 | ret = try_module_get(event->desc->owner); |
481 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 482 | break; |
1ec65de1 | 483 | case LTTNG_KERNEL_NOOP: |
259b6cb3 | 484 | event->desc = internal_desc; |
abc0446a | 485 | if (!event->desc) { |
4cf0bf51 | 486 | ret = -EINVAL; |
259b6cb3 | 487 | goto register_error; |
abc0446a | 488 | } |
1ec65de1 | 489 | break; |
baf20995 MD |
490 | default: |
491 | WARN_ON_ONCE(1); | |
4cf0bf51 | 492 | ret = -EINVAL; |
df07930b | 493 | goto register_error; |
baf20995 | 494 | } |
a90917c3 | 495 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
496 | WARN_ON_ONCE(ret > 0); |
497 | if (ret) { | |
c099397a | 498 | goto statedump_error; |
abc0446a | 499 | } |
dda6a249 | 500 | list_add(&event->list, &chan->session->events); |
11b5a3c2 | 501 | mutex_unlock(&sessions_mutex); |
4e3c1b9b MD |
502 | return event; |
503 | ||
c099397a | 504 | statedump_error: |
259b6cb3 | 505 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 506 | register_error: |
11b5a3c2 | 507 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
508 | cache_error: |
509 | exist: | |
e5382b6d | 510 | full: |
4e3c1b9b | 511 | mutex_unlock(&sessions_mutex); |
4cf0bf51 | 512 | return ERR_PTR(ret); |
4e3c1b9b MD |
513 | } |
514 | ||
515 | /* | |
516 | * Only used internally at session destruction. | |
517 | */ | |
a90917c3 | 518 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 519 | { |
11b5a3c2 MD |
520 | int ret = -EINVAL; |
521 | ||
38d024ae | 522 | switch (event->instrumentation) { |
ab2277d6 | 523 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 524 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 525 | event->desc->probe_callback, |
11b5a3c2 MD |
526 | event); |
527 | if (ret) | |
528 | return ret; | |
baf20995 | 529 | break; |
ab2277d6 | 530 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 531 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
532 | ret = 0; |
533 | break; | |
7371f44c MD |
534 | case LTTNG_KERNEL_KRETPROBE: |
535 | lttng_kretprobes_unregister(event); | |
536 | ret = 0; | |
537 | break; | |
ab2277d6 | 538 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
539 | lttng_ftrace_unregister(event); |
540 | ret = 0; | |
541 | break; | |
259b6cb3 MD |
542 | case LTTNG_KERNEL_NOOP: |
543 | ret = 0; | |
544 | break; | |
baf20995 MD |
545 | default: |
546 | WARN_ON_ONCE(1); | |
547 | } | |
dda6a249 MD |
548 | return ret; |
549 | } | |
550 | ||
551 | /* | |
552 | * Only used internally at session destruction. | |
553 | */ | |
be066e6c | 554 | static |
a90917c3 | 555 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 556 | { |
edeb3137 MD |
557 | switch (event->instrumentation) { |
558 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 559 | lttng_event_put(event->desc); |
edeb3137 MD |
560 | break; |
561 | case LTTNG_KERNEL_KPROBE: | |
562 | module_put(event->desc->owner); | |
563 | lttng_kprobes_destroy_private(event); | |
564 | break; | |
7371f44c MD |
565 | case LTTNG_KERNEL_KRETPROBE: |
566 | module_put(event->desc->owner); | |
567 | lttng_kretprobes_destroy_private(event); | |
568 | break; | |
edeb3137 MD |
569 | case LTTNG_KERNEL_FUNCTION: |
570 | module_put(event->desc->owner); | |
571 | lttng_ftrace_destroy_private(event); | |
572 | break; | |
259b6cb3 MD |
573 | case LTTNG_KERNEL_NOOP: |
574 | break; | |
edeb3137 MD |
575 | default: |
576 | WARN_ON_ONCE(1); | |
577 | } | |
dda6a249 | 578 | list_del(&event->list); |
8070f5c0 | 579 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 580 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
581 | } |
582 | ||
1ec3f75a | 583 | /* |
d83004aa JD |
584 | * Serialize at most one packet worth of metadata into a metadata |
585 | * channel. | |
1ec3f75a MD |
586 | * We have exclusive access to our metadata buffer (protected by the |
587 | * sessions_mutex), so we can do racy operations such as looking for | |
588 | * remaining space left in packet and write, since mutual exclusion | |
589 | * protects us from concurrent writes. | |
35097f36 JD |
590 | * Returns the number of bytes written in the channel, 0 if no data |
591 | * was written and a negative value on error. | |
1ec3f75a | 592 | */ |
b3b8072b MD |
593 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
594 | struct channel *chan) | |
d83004aa JD |
595 | { |
596 | struct lib_ring_buffer_ctx ctx; | |
597 | int ret = 0; | |
598 | size_t len, reserve_len; | |
599 | ||
f613e3e6 MD |
600 | /* |
601 | * Ensure we support mutiple get_next / put sequences followed | |
b773bad5 MD |
602 | * by put_next. The metadata stream lock internally protects |
603 | * reading the metadata cache. It can indeed be read | |
604 | * concurrently by "get_next_subbuf" and "flush" operations on | |
605 | * the buffer invoked by different processes. | |
f613e3e6 | 606 | */ |
b773bad5 | 607 | mutex_lock(&stream->lock); |
f613e3e6 MD |
608 | WARN_ON(stream->metadata_in < stream->metadata_out); |
609 | if (stream->metadata_in != stream->metadata_out) | |
b773bad5 | 610 | goto end; |
f613e3e6 | 611 | |
d83004aa | 612 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 613 | stream->metadata_in; |
9de2c215 | 614 | if (!len) |
b773bad5 | 615 | goto end; |
d83004aa | 616 | reserve_len = min_t(size_t, |
b3b8072b | 617 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 618 | len); |
b3b8072b | 619 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
620 | sizeof(char), -1); |
621 | /* | |
622 | * If reservation failed, return an error to the caller. | |
623 | */ | |
b3b8072b | 624 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
625 | if (ret != 0) { |
626 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
627 | goto end; | |
628 | } | |
b3b8072b | 629 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 630 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 631 | reserve_len); |
b3b8072b | 632 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 633 | stream->metadata_in += reserve_len; |
d83004aa JD |
634 | ret = reserve_len; |
635 | ||
636 | end: | |
b773bad5 | 637 | mutex_unlock(&stream->lock); |
d83004aa JD |
638 | return ret; |
639 | } | |
640 | ||
641 | /* | |
642 | * Write the metadata to the metadata cache. | |
643 | * Must be called with sessions_mutex held. | |
644 | */ | |
a90917c3 | 645 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
646 | const char *fmt, ...) |
647 | { | |
c099397a | 648 | char *str; |
d83004aa | 649 | size_t len; |
c099397a | 650 | va_list ap; |
d83004aa | 651 | struct lttng_metadata_stream *stream; |
c099397a MD |
652 | |
653 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
654 | ||
655 | va_start(ap, fmt); | |
656 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
657 | va_end(ap); | |
658 | if (!str) | |
659 | return -ENOMEM; | |
660 | ||
1ec3f75a | 661 | len = strlen(str); |
d83004aa JD |
662 | if (session->metadata_cache->metadata_written + len > |
663 | session->metadata_cache->cache_alloc) { | |
664 | char *tmp_cache_realloc; | |
665 | unsigned int tmp_cache_alloc_size; | |
666 | ||
667 | tmp_cache_alloc_size = max_t(unsigned int, | |
668 | session->metadata_cache->cache_alloc + len, | |
669 | session->metadata_cache->cache_alloc << 1); | |
670 | tmp_cache_realloc = krealloc(session->metadata_cache->data, | |
671 | tmp_cache_alloc_size, GFP_KERNEL); | |
672 | if (!tmp_cache_realloc) | |
673 | goto err; | |
674 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; | |
675 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 676 | } |
d83004aa JD |
677 | memcpy(session->metadata_cache->data + |
678 | session->metadata_cache->metadata_written, | |
679 | str, len); | |
680 | session->metadata_cache->metadata_written += len; | |
c099397a | 681 | kfree(str); |
d83004aa JD |
682 | |
683 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
684 | wake_up_interruptible(&stream->read_wait); | |
685 | ||
686 | return 0; | |
687 | ||
688 | err: | |
689 | kfree(str); | |
690 | return -ENOMEM; | |
c099397a MD |
691 | } |
692 | ||
d83004aa JD |
693 | /* |
694 | * Must be called with sessions_mutex held. | |
695 | */ | |
c099397a | 696 | static |
a90917c3 | 697 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 698 | const struct lttng_event_field *field) |
c099397a | 699 | { |
c099397a | 700 | int ret = 0; |
c099397a | 701 | |
8070f5c0 MD |
702 | switch (field->type.atype) { |
703 | case atype_integer: | |
704 | ret = lttng_metadata_printf(session, | |
244465ab | 705 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
706 | field->type.u.basic.integer.size, |
707 | field->type.u.basic.integer.alignment, | |
708 | field->type.u.basic.integer.signedness, | |
709 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
710 | ? "none" | |
711 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
712 | ? "UTF8" | |
713 | : "ASCII", | |
714 | field->type.u.basic.integer.base, | |
c099397a | 715 | #ifdef __BIG_ENDIAN |
8070f5c0 | 716 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 717 | #else |
8070f5c0 | 718 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 719 | #endif |
8070f5c0 MD |
720 | field->name); |
721 | break; | |
722 | case atype_enum: | |
723 | ret = lttng_metadata_printf(session, | |
244465ab | 724 | " %s _%s;\n", |
8070f5c0 MD |
725 | field->type.u.basic.enumeration.name, |
726 | field->name); | |
727 | break; | |
728 | case atype_array: | |
729 | { | |
730 | const struct lttng_basic_type *elem_type; | |
731 | ||
732 | elem_type = &field->type.u.array.elem_type; | |
733 | ret = lttng_metadata_printf(session, | |
244465ab | 734 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
735 | elem_type->u.basic.integer.size, |
736 | elem_type->u.basic.integer.alignment, | |
737 | elem_type->u.basic.integer.signedness, | |
738 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
739 | ? "none" | |
740 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
741 | ? "UTF8" | |
742 | : "ASCII", | |
743 | elem_type->u.basic.integer.base, | |
8fa75f34 | 744 | #ifdef __BIG_ENDIAN |
8070f5c0 | 745 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 746 | #else |
8070f5c0 | 747 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 748 | #endif |
8070f5c0 MD |
749 | field->name, field->type.u.array.length); |
750 | break; | |
751 | } | |
752 | case atype_sequence: | |
753 | { | |
754 | const struct lttng_basic_type *elem_type; | |
755 | const struct lttng_basic_type *length_type; | |
756 | ||
757 | elem_type = &field->type.u.sequence.elem_type; | |
758 | length_type = &field->type.u.sequence.length_type; | |
759 | ret = lttng_metadata_printf(session, | |
760 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 761 | length_type->u.basic.integer.size, |
32257272 | 762 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
763 | length_type->u.basic.integer.signedness, |
764 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
765 | ? "none" | |
0635cdd4 | 766 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 767 | ? "UTF8" |
0635cdd4 | 768 | : "ASCII"), |
8070f5c0 | 769 | length_type->u.basic.integer.base, |
e0a7a7c4 | 770 | #ifdef __BIG_ENDIAN |
8070f5c0 | 771 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 772 | #else |
0635cdd4 | 773 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 774 | #endif |
27d2368e MD |
775 | field->name); |
776 | if (ret) | |
777 | return ret; | |
778 | ||
779 | ret = lttng_metadata_printf(session, | |
244465ab | 780 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 781 | elem_type->u.basic.integer.size, |
32257272 | 782 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
783 | elem_type->u.basic.integer.signedness, |
784 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
785 | ? "none" | |
0635cdd4 | 786 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 787 | ? "UTF8" |
0635cdd4 | 788 | : "ASCII"), |
8070f5c0 | 789 | elem_type->u.basic.integer.base, |
8fa75f34 | 790 | #ifdef __BIG_ENDIAN |
8070f5c0 | 791 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 792 | #else |
8070f5c0 | 793 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 794 | #endif |
8070f5c0 | 795 | field->name, |
27d2368e | 796 | field->name); |
8070f5c0 MD |
797 | break; |
798 | } | |
c099397a | 799 | |
8070f5c0 MD |
800 | case atype_string: |
801 | /* Default encoding is UTF8 */ | |
802 | ret = lttng_metadata_printf(session, | |
244465ab | 803 | " string%s _%s;\n", |
8070f5c0 MD |
804 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
805 | " { encoding = ASCII; }" : "", | |
806 | field->name); | |
807 | break; | |
808 | default: | |
809 | WARN_ON_ONCE(1); | |
810 | return -EINVAL; | |
811 | } | |
812 | return ret; | |
813 | } | |
814 | ||
815 | static | |
a90917c3 | 816 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
817 | struct lttng_ctx *ctx) |
818 | { | |
819 | int ret = 0; | |
820 | int i; | |
821 | ||
822 | if (!ctx) | |
823 | return 0; | |
824 | for (i = 0; i < ctx->nr_fields; i++) { | |
825 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
826 | ||
a90917c3 | 827 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
828 | if (ret) |
829 | return ret; | |
830 | } | |
831 | return ret; | |
832 | } | |
833 | ||
834 | static | |
a90917c3 MD |
835 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
836 | struct lttng_event *event) | |
8070f5c0 MD |
837 | { |
838 | const struct lttng_event_desc *desc = event->desc; | |
839 | int ret = 0; | |
840 | int i; | |
841 | ||
842 | for (i = 0; i < desc->nr_fields; i++) { | |
843 | const struct lttng_event_field *field = &desc->fields[i]; | |
844 | ||
a90917c3 | 845 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
846 | if (ret) |
847 | return ret; | |
c099397a MD |
848 | } |
849 | return ret; | |
850 | } | |
851 | ||
d83004aa JD |
852 | /* |
853 | * Must be called with sessions_mutex held. | |
854 | */ | |
c099397a | 855 | static |
a90917c3 MD |
856 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
857 | struct lttng_channel *chan, | |
858 | struct lttng_event *event) | |
c099397a MD |
859 | { |
860 | int ret = 0; | |
861 | ||
862 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
863 | return 0; | |
d83004aa | 864 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
865 | return 0; |
866 | ||
867 | ret = lttng_metadata_printf(session, | |
868 | "event {\n" | |
ae734547 | 869 | " name = \"%s\";\n" |
c099397a | 870 | " id = %u;\n" |
b9074a1b | 871 | " stream_id = %u;\n", |
c099397a MD |
872 | event->desc->name, |
873 | event->id, | |
874 | event->chan->id); | |
875 | if (ret) | |
876 | goto end; | |
877 | ||
b9074a1b MD |
878 | if (event->ctx) { |
879 | ret = lttng_metadata_printf(session, | |
880 | " context := struct {\n"); | |
881 | if (ret) | |
882 | goto end; | |
883 | } | |
a90917c3 | 884 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
885 | if (ret) |
886 | goto end; | |
b9074a1b MD |
887 | if (event->ctx) { |
888 | ret = lttng_metadata_printf(session, | |
889 | " };\n"); | |
890 | if (ret) | |
891 | goto end; | |
892 | } | |
8070f5c0 MD |
893 | |
894 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
895 | " fields := struct {\n" |
896 | ); | |
897 | if (ret) | |
898 | goto end; | |
899 | ||
a90917c3 | 900 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
901 | if (ret) |
902 | goto end; | |
903 | ||
904 | /* | |
905 | * LTTng space reservation can only reserve multiples of the | |
906 | * byte size. | |
907 | */ | |
908 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
909 | " };\n" |
910 | "};\n\n"); | |
c099397a MD |
911 | if (ret) |
912 | goto end; | |
913 | ||
c099397a MD |
914 | event->metadata_dumped = 1; |
915 | end: | |
916 | return ret; | |
917 | ||
918 | } | |
919 | ||
d83004aa JD |
920 | /* |
921 | * Must be called with sessions_mutex held. | |
922 | */ | |
c099397a | 923 | static |
a90917c3 MD |
924 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
925 | struct lttng_channel *chan) | |
c099397a MD |
926 | { |
927 | int ret = 0; | |
928 | ||
929 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
930 | return 0; | |
d83004aa JD |
931 | |
932 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
933 | return 0; |
934 | ||
935 | WARN_ON_ONCE(!chan->header_type); | |
936 | ret = lttng_metadata_printf(session, | |
937 | "stream {\n" | |
938 | " id = %u;\n" | |
9115fbdc | 939 | " event.header := %s;\n" |
b9074a1b | 940 | " packet.context := struct packet_context;\n", |
c099397a MD |
941 | chan->id, |
942 | chan->header_type == 1 ? "struct event_header_compact" : | |
943 | "struct event_header_large"); | |
944 | if (ret) | |
945 | goto end; | |
946 | ||
b9074a1b MD |
947 | if (chan->ctx) { |
948 | ret = lttng_metadata_printf(session, | |
949 | " event.context := struct {\n"); | |
950 | if (ret) | |
951 | goto end; | |
952 | } | |
a90917c3 | 953 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
954 | if (ret) |
955 | goto end; | |
b9074a1b MD |
956 | if (chan->ctx) { |
957 | ret = lttng_metadata_printf(session, | |
958 | " };\n"); | |
959 | if (ret) | |
960 | goto end; | |
961 | } | |
8070f5c0 MD |
962 | |
963 | ret = lttng_metadata_printf(session, | |
b9074a1b | 964 | "};\n\n"); |
8070f5c0 | 965 | |
c099397a MD |
966 | chan->metadata_dumped = 1; |
967 | end: | |
968 | return ret; | |
969 | } | |
970 | ||
d83004aa JD |
971 | /* |
972 | * Must be called with sessions_mutex held. | |
973 | */ | |
9115fbdc | 974 | static |
a90917c3 | 975 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
976 | { |
977 | return lttng_metadata_printf(session, | |
978 | "struct packet_context {\n" | |
a3ccff4f MD |
979 | " uint64_clock_monotonic_t timestamp_begin;\n" |
980 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
981 | " uint64_t content_size;\n" |
982 | " uint64_t packet_size;\n" | |
a9afe705 | 983 | " unsigned long events_discarded;\n" |
9115fbdc | 984 | " uint32_t cpu_id;\n" |
c6dfdf6f | 985 | "};\n\n" |
9115fbdc MD |
986 | ); |
987 | } | |
988 | ||
989 | /* | |
990 | * Compact header: | |
991 | * id: range: 0 - 30. | |
992 | * id 31 is reserved to indicate an extended header. | |
993 | * | |
994 | * Large header: | |
995 | * id: range: 0 - 65534. | |
996 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
997 | * |
998 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
999 | */ |
1000 | static | |
a90917c3 | 1001 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1002 | { |
1003 | return lttng_metadata_printf(session, | |
1004 | "struct event_header_compact {\n" | |
1005 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1006 | " variant <id> {\n" | |
1007 | " struct {\n" | |
a3ccff4f | 1008 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1009 | " } compact;\n" |
1010 | " struct {\n" | |
1011 | " uint32_t id;\n" | |
a3ccff4f | 1012 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1013 | " } extended;\n" |
1014 | " } v;\n" | |
1015 | "} align(%u);\n" | |
1016 | "\n" | |
1017 | "struct event_header_large {\n" | |
1018 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1019 | " variant <id> {\n" | |
1020 | " struct {\n" | |
a3ccff4f | 1021 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1022 | " } compact;\n" |
1023 | " struct {\n" | |
1024 | " uint32_t id;\n" | |
a3ccff4f | 1025 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1026 | " } extended;\n" |
1027 | " } v;\n" | |
1028 | "} align(%u);\n\n", | |
a90917c3 MD |
1029 | lttng_alignof(uint32_t) * CHAR_BIT, |
1030 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1031 | ); |
1032 | } | |
1033 | ||
a3ccff4f MD |
1034 | /* |
1035 | * Approximation of NTP time of day to clock monotonic correlation, | |
1036 | * taken at start of trace. | |
1037 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1038 | * in future versions. | |
1039 | */ | |
1040 | static | |
1041 | uint64_t measure_clock_offset(void) | |
1042 | { | |
1043 | uint64_t offset, monotonic[2], realtime; | |
1044 | struct timespec rts = { 0, 0 }; | |
1045 | unsigned long flags; | |
1046 | ||
1047 | /* Disable interrupts to increase correlation precision. */ | |
1048 | local_irq_save(flags); | |
1049 | monotonic[0] = trace_clock_read64(); | |
1050 | getnstimeofday(&rts); | |
1051 | monotonic[1] = trace_clock_read64(); | |
1052 | local_irq_restore(flags); | |
1053 | ||
1054 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
57be518d | 1055 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f MD |
1056 | realtime += rts.tv_nsec; |
1057 | offset = realtime - offset; | |
1058 | return offset; | |
1059 | } | |
1060 | ||
c099397a MD |
1061 | /* |
1062 | * Output metadata into this session's metadata buffers. | |
d83004aa | 1063 | * Must be called with sessions_mutex held. |
c099397a MD |
1064 | */ |
1065 | static | |
a90917c3 | 1066 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 1067 | { |
30bdb6e4 | 1068 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 1069 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
1070 | struct lttng_channel *chan; |
1071 | struct lttng_event *event; | |
c099397a MD |
1072 | int ret = 0; |
1073 | ||
1074 | if (!ACCESS_ONCE(session->active)) | |
1075 | return 0; | |
1076 | if (session->metadata_dumped) | |
1077 | goto skip_session; | |
c099397a | 1078 | |
d793d5e1 | 1079 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
1080 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
1081 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1082 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1083 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1084 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
1085 | |
1086 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1087 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
1088 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1089 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1090 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 1091 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
1092 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1093 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
1094 | "\n" |
1095 | "trace {\n" | |
1096 | " major = %u;\n" | |
1097 | " minor = %u;\n" | |
30bdb6e4 | 1098 | " uuid = \"%s\";\n" |
d793d5e1 MD |
1099 | " byte_order = %s;\n" |
1100 | " packet.header := struct {\n" | |
1101 | " uint32_t magic;\n" | |
1ec3f75a | 1102 | " uint8_t uuid[16];\n" |
d793d5e1 | 1103 | " uint32_t stream_id;\n" |
0eb25f58 | 1104 | " };\n" |
d793d5e1 | 1105 | "};\n\n", |
a90917c3 MD |
1106 | lttng_alignof(uint8_t) * CHAR_BIT, |
1107 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1108 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1109 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
1110 | sizeof(unsigned long) * CHAR_BIT, |
1111 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
1112 | CTF_SPEC_MAJOR, |
1113 | CTF_SPEC_MINOR, | |
d793d5e1 MD |
1114 | uuid_s, |
1115 | #ifdef __BIG_ENDIAN | |
1116 | "be" | |
1117 | #else | |
1118 | "le" | |
1119 | #endif | |
1120 | ); | |
1121 | if (ret) | |
1122 | goto end; | |
1123 | ||
99dc9597 MD |
1124 | ret = lttng_metadata_printf(session, |
1125 | "env {\n" | |
a6058143 | 1126 | " hostname = \"%s\";\n" |
c6c9e10f | 1127 | " domain = \"kernel\";\n" |
99dc9597 | 1128 | " sysname = \"%s\";\n" |
c6c9e10f MD |
1129 | " kernel_release = \"%s\";\n" |
1130 | " kernel_version = \"%s\";\n" | |
1131 | " tracer_name = \"lttng-modules\";\n" | |
1132 | " tracer_major = %d;\n" | |
1133 | " tracer_minor = %d;\n" | |
1134 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 1135 | "};\n\n", |
3d0d43db | 1136 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
1137 | utsname()->sysname, |
1138 | utsname()->release, | |
c6c9e10f MD |
1139 | utsname()->version, |
1140 | LTTNG_MODULES_MAJOR_VERSION, | |
1141 | LTTNG_MODULES_MINOR_VERSION, | |
1142 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
1143 | ); |
1144 | if (ret) | |
1145 | goto end; | |
1146 | ||
a3ccff4f MD |
1147 | ret = lttng_metadata_printf(session, |
1148 | "clock {\n" | |
a82c63f1 MD |
1149 | " name = %s;\n", |
1150 | "monotonic" | |
1151 | ); | |
1152 | if (ret) | |
1153 | goto end; | |
1154 | ||
1155 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1156 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 1157 | " uuid = \"%s\";\n", |
a82c63f1 MD |
1158 | clock_uuid_s |
1159 | ); | |
1160 | if (ret) | |
1161 | goto end; | |
1162 | } | |
1163 | ||
1164 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
1165 | " description = \"Monotonic Clock\";\n" |
1166 | " freq = %llu; /* Frequency, in Hz */\n" | |
1167 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1168 | " offset = %llu;\n" | |
1169 | "};\n\n", | |
a3ccff4f MD |
1170 | (unsigned long long) trace_clock_freq(), |
1171 | (unsigned long long) measure_clock_offset() | |
1172 | ); | |
1173 | if (ret) | |
1174 | goto end; | |
1175 | ||
1176 | ret = lttng_metadata_printf(session, | |
1177 | "typealias integer {\n" | |
1178 | " size = 27; align = 1; signed = false;\n" | |
1179 | " map = clock.monotonic.value;\n" | |
1180 | "} := uint27_clock_monotonic_t;\n" | |
1181 | "\n" | |
1182 | "typealias integer {\n" | |
1183 | " size = 32; align = %u; signed = false;\n" | |
1184 | " map = clock.monotonic.value;\n" | |
1185 | "} := uint32_clock_monotonic_t;\n" | |
1186 | "\n" | |
1187 | "typealias integer {\n" | |
1188 | " size = 64; align = %u; signed = false;\n" | |
1189 | " map = clock.monotonic.value;\n" | |
1190 | "} := uint64_clock_monotonic_t;\n\n", | |
1191 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1192 | lttng_alignof(uint64_t) * CHAR_BIT | |
1193 | ); | |
1194 | if (ret) | |
1195 | goto end; | |
1196 | ||
a90917c3 | 1197 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
1198 | if (ret) |
1199 | goto end; | |
1200 | ||
a90917c3 | 1201 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
1202 | if (ret) |
1203 | goto end; | |
1204 | ||
c099397a MD |
1205 | skip_session: |
1206 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 1207 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
1208 | if (ret) |
1209 | goto end; | |
1210 | } | |
1211 | ||
1212 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 1213 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
1214 | if (ret) |
1215 | goto end; | |
1216 | } | |
1217 | session->metadata_dumped = 1; | |
1218 | end: | |
1219 | return ret; | |
1220 | } | |
1221 | ||
c0e31d2e | 1222 | /** |
a90917c3 | 1223 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
1224 | * @transport: transport structure |
1225 | * | |
1226 | * Registers a transport which can be used as output to extract the data out of | |
1227 | * LTTng. The module calling this registration function must ensure that no | |
1228 | * trap-inducing code will be executed by the transport functions. E.g. | |
1229 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
1230 | * is made visible to the transport function. This registration acts as a | |
1231 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
1232 | * after its registration must it synchronize the TLBs. | |
1233 | */ | |
a90917c3 | 1234 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
1235 | { |
1236 | /* | |
1237 | * Make sure no page fault can be triggered by the module about to be | |
1238 | * registered. We deal with this here so we don't have to call | |
1239 | * vmalloc_sync_all() in each module's init. | |
1240 | */ | |
6d2a620c | 1241 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
1242 | |
1243 | mutex_lock(&sessions_mutex); | |
a90917c3 | 1244 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
1245 | mutex_unlock(&sessions_mutex); |
1246 | } | |
a90917c3 | 1247 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
1248 | |
1249 | /** | |
a90917c3 | 1250 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
1251 | * @transport: transport structure |
1252 | */ | |
a90917c3 | 1253 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
1254 | { |
1255 | mutex_lock(&sessions_mutex); | |
1256 | list_del(&transport->node); | |
1257 | mutex_unlock(&sessions_mutex); | |
1258 | } | |
a90917c3 | 1259 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 1260 | |
a90917c3 | 1261 | static int __init lttng_events_init(void) |
4e3c1b9b | 1262 | { |
1c25284c MD |
1263 | int ret; |
1264 | ||
91c2dd86 JD |
1265 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
1266 | if (ret) | |
1267 | return ret; | |
1268 | ||
20591cf7 MD |
1269 | ret = lttng_tracepoint_init(); |
1270 | if (ret) | |
1271 | return ret; | |
a90917c3 | 1272 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
1273 | if (!event_cache) { |
1274 | ret = -ENOMEM; | |
1275 | goto error_kmem; | |
1276 | } | |
80996790 | 1277 | ret = lttng_abi_init(); |
02119ee5 MD |
1278 | if (ret) |
1279 | goto error_abi; | |
0c956676 MD |
1280 | ret = lttng_logger_init(); |
1281 | if (ret) | |
1282 | goto error_logger; | |
4e3c1b9b | 1283 | return 0; |
0c956676 MD |
1284 | |
1285 | error_logger: | |
1286 | lttng_abi_exit(); | |
02119ee5 | 1287 | error_abi: |
1c25284c | 1288 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
1289 | error_kmem: |
1290 | lttng_tracepoint_exit(); | |
1c25284c | 1291 | return ret; |
4e3c1b9b MD |
1292 | } |
1293 | ||
a90917c3 | 1294 | module_init(lttng_events_init); |
11b5a3c2 | 1295 | |
a90917c3 | 1296 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 1297 | { |
a90917c3 | 1298 | struct lttng_session *session, *tmpsession; |
92e94819 | 1299 | |
0c956676 | 1300 | lttng_logger_exit(); |
80996790 | 1301 | lttng_abi_exit(); |
92e94819 | 1302 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 1303 | lttng_session_destroy(session); |
11b5a3c2 | 1304 | kmem_cache_destroy(event_cache); |
20591cf7 | 1305 | lttng_tracepoint_exit(); |
4e3c1b9b | 1306 | } |
92e94819 | 1307 | |
a90917c3 | 1308 | module_exit(lttng_events_exit); |
11b5a3c2 | 1309 | |
92e94819 MD |
1310 | MODULE_LICENSE("GPL and additional rights"); |
1311 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1312 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
1313 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
1314 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
1315 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
1316 | LTTNG_MODULES_EXTRAVERSION); |