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> |
a864fb02 | 30 | #include "wrapper/uuid.h" |
b13f3ebe | 31 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
a82c63f1 | 32 | #include "wrapper/random.h" |
3a523f5b | 33 | #include "wrapper/tracepoint.h" |
b8590f40 | 34 | #include "lttng-kernel-version.h" |
a90917c3 MD |
35 | #include "lttng-events.h" |
36 | #include "lttng-tracer.h" | |
6dccd6c1 | 37 | #include "lttng-abi-old.h" |
4e3c1b9b | 38 | |
d83004aa JD |
39 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
40 | ||
4e3c1b9b | 41 | static LIST_HEAD(sessions); |
a90917c3 | 42 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
43 | /* |
44 | * Protect the sessions and metadata caches. | |
45 | */ | |
4e3c1b9b MD |
46 | static DEFINE_MUTEX(sessions_mutex); |
47 | static struct kmem_cache *event_cache; | |
48 | ||
a90917c3 MD |
49 | static void _lttng_event_destroy(struct lttng_event *event); |
50 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
51 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 52 | static |
a90917c3 MD |
53 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
54 | struct lttng_channel *chan, | |
55 | struct lttng_event *event); | |
c099397a | 56 | static |
a90917c3 | 57 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
58 | static |
59 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 60 | |
c099397a | 61 | void synchronize_trace(void) |
abcca994 MD |
62 | { |
63 | synchronize_sched(); | |
b8590f40 MD |
64 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
65 | #ifdef CONFIG_PREEMPT_RT_FULL | |
66 | synchronize_rcu(); | |
67 | #endif | |
68 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
69 | #ifdef CONFIG_PREEMPT_RT |
70 | synchronize_rcu(); | |
71 | #endif | |
b8590f40 | 72 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
73 | } |
74 | ||
a90917c3 | 75 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 76 | { |
a90917c3 | 77 | struct lttng_session *session; |
d83004aa | 78 | struct lttng_metadata_cache *metadata_cache; |
4e3c1b9b MD |
79 | |
80 | mutex_lock(&sessions_mutex); | |
a90917c3 | 81 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 82 | if (!session) |
d83004aa | 83 | goto err; |
4e3c1b9b | 84 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 85 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 86 | uuid_le_gen(&session->uuid); |
d83004aa JD |
87 | |
88 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
89 | GFP_KERNEL); | |
90 | if (!metadata_cache) | |
91 | goto err_free_session; | |
92 | metadata_cache->data = kzalloc(METADATA_CACHE_DEFAULT_SIZE, | |
93 | GFP_KERNEL); | |
94 | if (!metadata_cache->data) | |
95 | goto err_free_cache; | |
96 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
97 | kref_init(&metadata_cache->refcount); | |
98 | session->metadata_cache = metadata_cache; | |
99 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
4e3c1b9b MD |
100 | list_add(&session->list, &sessions); |
101 | mutex_unlock(&sessions_mutex); | |
102 | return session; | |
d83004aa JD |
103 | |
104 | err_free_cache: | |
105 | kfree(metadata_cache); | |
106 | err_free_session: | |
107 | kfree(session); | |
108 | err: | |
109 | mutex_unlock(&sessions_mutex); | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | void metadata_cache_destroy(struct kref *kref) | |
114 | { | |
115 | struct lttng_metadata_cache *cache = | |
116 | container_of(kref, struct lttng_metadata_cache, refcount); | |
117 | kfree(cache->data); | |
118 | kfree(cache); | |
4e3c1b9b MD |
119 | } |
120 | ||
a90917c3 | 121 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 122 | { |
a90917c3 MD |
123 | struct lttng_channel *chan, *tmpchan; |
124 | struct lttng_event *event, *tmpevent; | |
d83004aa | 125 | struct lttng_metadata_stream *metadata_stream; |
dda6a249 | 126 | int ret; |
4e3c1b9b MD |
127 | |
128 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 129 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
130 | list_for_each_entry(chan, &session->chan, list) { |
131 | ret = lttng_syscalls_unregister(chan); | |
132 | WARN_ON(ret); | |
133 | } | |
dda6a249 | 134 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 135 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
136 | WARN_ON(ret); |
137 | } | |
abcca994 | 138 | synchronize_trace(); /* Wait for in-flight events to complete */ |
4e3c1b9b | 139 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 140 | _lttng_event_destroy(event); |
d83004aa JD |
141 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
142 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 143 | _lttng_channel_destroy(chan); |
d83004aa JD |
144 | } |
145 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
146 | _lttng_metadata_channel_hangup(metadata_stream); | |
147 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); | |
4e3c1b9b MD |
148 | list_del(&session->list); |
149 | mutex_unlock(&sessions_mutex); | |
150 | kfree(session); | |
151 | } | |
152 | ||
a90917c3 | 153 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
154 | { |
155 | int ret = 0; | |
a90917c3 | 156 | struct lttng_channel *chan; |
c0e31d2e MD |
157 | |
158 | mutex_lock(&sessions_mutex); | |
159 | if (session->active) { | |
160 | ret = -EBUSY; | |
161 | goto end; | |
162 | } | |
c099397a MD |
163 | |
164 | /* | |
165 | * Snapshot the number of events per channel to know the type of header | |
166 | * we need to use. | |
167 | */ | |
168 | list_for_each_entry(chan, &session->chan, list) { | |
169 | if (chan->header_type) | |
170 | continue; /* don't change it if session stop/restart */ | |
171 | if (chan->free_event_id < 31) | |
172 | chan->header_type = 1; /* compact */ | |
173 | else | |
174 | chan->header_type = 2; /* large */ | |
175 | } | |
176 | ||
52fc2e1f | 177 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 178 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 179 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
180 | if (ret) { |
181 | ACCESS_ONCE(session->active) = 0; | |
182 | goto end; | |
183 | } | |
184 | ret = lttng_statedump_start(session); | |
360f38ea | 185 | if (ret) |
c099397a | 186 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
187 | end: |
188 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 189 | return ret; |
c0e31d2e MD |
190 | } |
191 | ||
a90917c3 | 192 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
193 | { |
194 | int ret = 0; | |
195 | ||
196 | mutex_lock(&sessions_mutex); | |
197 | if (!session->active) { | |
198 | ret = -EBUSY; | |
199 | goto end; | |
200 | } | |
52fc2e1f | 201 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
202 | end: |
203 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 204 | return ret; |
c0e31d2e MD |
205 | } |
206 | ||
a90917c3 | 207 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da MD |
208 | { |
209 | int old; | |
210 | ||
d83004aa | 211 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 212 | return -EPERM; |
e64957da MD |
213 | old = xchg(&channel->enabled, 1); |
214 | if (old) | |
215 | return -EEXIST; | |
216 | return 0; | |
217 | } | |
218 | ||
a90917c3 | 219 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da MD |
220 | { |
221 | int old; | |
222 | ||
d83004aa | 223 | if (channel->channel_type == METADATA_CHANNEL) |
c6485006 | 224 | return -EPERM; |
e64957da MD |
225 | old = xchg(&channel->enabled, 0); |
226 | if (!old) | |
227 | return -EEXIST; | |
228 | return 0; | |
229 | } | |
230 | ||
a90917c3 | 231 | int lttng_event_enable(struct lttng_event *event) |
e64957da MD |
232 | { |
233 | int old; | |
234 | ||
d83004aa | 235 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 236 | return -EPERM; |
e64957da MD |
237 | old = xchg(&event->enabled, 1); |
238 | if (old) | |
239 | return -EEXIST; | |
240 | return 0; | |
241 | } | |
242 | ||
a90917c3 | 243 | int lttng_event_disable(struct lttng_event *event) |
e64957da MD |
244 | { |
245 | int old; | |
246 | ||
d83004aa | 247 | if (event->chan->channel_type == METADATA_CHANNEL) |
c6485006 | 248 | return -EPERM; |
e64957da MD |
249 | old = xchg(&event->enabled, 0); |
250 | if (!old) | |
251 | return -EEXIST; | |
252 | return 0; | |
253 | } | |
254 | ||
a90917c3 | 255 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 256 | { |
a90917c3 | 257 | struct lttng_transport *transport; |
f3d01b96 | 258 | |
a90917c3 | 259 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
260 | if (!strcmp(transport->name, name)) |
261 | return transport; | |
262 | } | |
263 | return NULL; | |
264 | } | |
265 | ||
a90917c3 | 266 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
267 | const char *transport_name, |
268 | void *buf_addr, | |
4e3c1b9b MD |
269 | size_t subbuf_size, size_t num_subbuf, |
270 | unsigned int switch_timer_interval, | |
d83004aa JD |
271 | unsigned int read_timer_interval, |
272 | enum channel_type channel_type) | |
4e3c1b9b | 273 | { |
a90917c3 MD |
274 | struct lttng_channel *chan; |
275 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
276 | |
277 | mutex_lock(&sessions_mutex); | |
d83004aa | 278 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 279 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 280 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
281 | if (!transport) { |
282 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
283 | transport_name); | |
c0e31d2e | 284 | goto notransport; |
f3d01b96 | 285 | } |
a33c9927 MD |
286 | if (!try_module_get(transport->owner)) { |
287 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
288 | goto notransport; | |
289 | } | |
a90917c3 | 290 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 291 | if (!chan) |
c0e31d2e | 292 | goto nomem; |
4e3c1b9b | 293 | chan->session = session; |
05d32c64 | 294 | chan->id = session->free_chan_id++; |
3b731ab1 | 295 | chan->ops = &transport->ops; |
125b4df4 MD |
296 | /* |
297 | * Note: the channel creation op already writes into the packet | |
298 | * headers. Therefore the "chan" information used as input | |
299 | * should be already accessible. | |
300 | */ | |
5f5ddf01 MD |
301 | chan->chan = transport->ops.channel_create(transport_name, |
302 | chan, buf_addr, subbuf_size, num_subbuf, | |
303 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
304 | if (!chan->chan) |
305 | goto create_error; | |
e64957da | 306 | chan->enabled = 1; |
a33c9927 | 307 | chan->transport = transport; |
d83004aa | 308 | chan->channel_type = channel_type; |
4e3c1b9b MD |
309 | list_add(&chan->list, &session->chan); |
310 | mutex_unlock(&sessions_mutex); | |
311 | return chan; | |
312 | ||
f3d01b96 MD |
313 | create_error: |
314 | kfree(chan); | |
c0e31d2e | 315 | nomem: |
a33c9927 MD |
316 | if (transport) |
317 | module_put(transport->owner); | |
c0e31d2e | 318 | notransport: |
e5382b6d | 319 | active: |
4e3c1b9b MD |
320 | mutex_unlock(&sessions_mutex); |
321 | return NULL; | |
322 | } | |
323 | ||
324 | /* | |
d83004aa JD |
325 | * Only used internally at session destruction for per-cpu channels, and |
326 | * when metadata channel is released. | |
327 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 328 | */ |
aa7c23a9 | 329 | static |
a90917c3 | 330 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 331 | { |
11b5a3c2 | 332 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 333 | module_put(chan->transport->owner); |
4e3c1b9b | 334 | list_del(&chan->list); |
8070f5c0 | 335 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
336 | kfree(chan); |
337 | } | |
338 | ||
d83004aa JD |
339 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
340 | { | |
341 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
342 | ||
343 | /* Protect the metadata cache with the sessions_mutex. */ | |
344 | mutex_lock(&sessions_mutex); | |
345 | _lttng_channel_destroy(chan); | |
346 | mutex_unlock(&sessions_mutex); | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
349 | ||
350 | static | |
351 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
352 | { | |
353 | stream->finalized = 1; | |
354 | wake_up_interruptible(&stream->read_wait); | |
355 | } | |
356 | ||
e5382b6d MD |
357 | /* |
358 | * Supports event creation while tracing session is active. | |
359 | */ | |
a90917c3 | 360 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
d6d808f3 | 361 | struct lttng_kernel_event *event_param, |
259b6cb3 MD |
362 | void *filter, |
363 | const struct lttng_event_desc *internal_desc) | |
4e3c1b9b | 364 | { |
a90917c3 | 365 | struct lttng_event *event; |
3d084699 | 366 | int ret; |
4e3c1b9b MD |
367 | |
368 | mutex_lock(&sessions_mutex); | |
37303c75 | 369 | if (chan->free_event_id == -1U) |
e5382b6d | 370 | goto full; |
4e3c1b9b | 371 | /* |
dda6a249 MD |
372 | * This is O(n^2) (for each event, the loop is called at event |
373 | * creation). Might require a hash if we have lots of events. | |
4e3c1b9b MD |
374 | */ |
375 | list_for_each_entry(event, &chan->session->events, list) | |
30bdb6e4 | 376 | if (!strcmp(event->desc->name, event_param->name)) |
4e3c1b9b | 377 | goto exist; |
11b5a3c2 | 378 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
4e3c1b9b MD |
379 | if (!event) |
380 | goto cache_error; | |
4e3c1b9b MD |
381 | event->chan = chan; |
382 | event->filter = filter; | |
e5382b6d | 383 | event->id = chan->free_event_id++; |
e64957da | 384 | event->enabled = 1; |
d6d808f3 | 385 | event->instrumentation = event_param->instrumentation; |
a90917c3 | 386 | /* Populate lttng_event structure before tracepoint registration. */ |
e5382b6d | 387 | smp_wmb(); |
d6d808f3 | 388 | switch (event_param->instrumentation) { |
ab2277d6 | 389 | case LTTNG_KERNEL_TRACEPOINT: |
a90917c3 | 390 | event->desc = lttng_event_get(event_param->name); |
d3dbe23c MD |
391 | if (!event->desc) |
392 | goto register_error; | |
3a523f5b | 393 | ret = kabi_2635_tracepoint_probe_register(event_param->name, |
d3dbe23c MD |
394 | event->desc->probe_callback, |
395 | event); | |
11b5a3c2 MD |
396 | if (ret) |
397 | goto register_error; | |
baf20995 | 398 | break; |
ab2277d6 | 399 | case LTTNG_KERNEL_KPROBE: |
30bdb6e4 | 400 | ret = lttng_kprobes_register(event_param->name, |
f17701fb MD |
401 | event_param->u.kprobe.symbol_name, |
402 | event_param->u.kprobe.offset, | |
403 | event_param->u.kprobe.addr, | |
404 | event); | |
405 | if (ret) | |
d6d808f3 | 406 | goto register_error; |
edeb3137 MD |
407 | ret = try_module_get(event->desc->owner); |
408 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 409 | break; |
7371f44c MD |
410 | case LTTNG_KERNEL_KRETPROBE: |
411 | { | |
a90917c3 | 412 | struct lttng_event *event_return; |
7371f44c MD |
413 | |
414 | /* kretprobe defines 2 events */ | |
415 | event_return = | |
416 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
417 | if (!event_return) | |
418 | goto register_error; | |
419 | event_return->chan = chan; | |
420 | event_return->filter = filter; | |
421 | event_return->id = chan->free_event_id++; | |
422 | event_return->enabled = 1; | |
423 | event_return->instrumentation = event_param->instrumentation; | |
424 | /* | |
a90917c3 | 425 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
426 | */ |
427 | smp_wmb(); | |
428 | ret = lttng_kretprobes_register(event_param->name, | |
429 | event_param->u.kretprobe.symbol_name, | |
430 | event_param->u.kretprobe.offset, | |
431 | event_param->u.kretprobe.addr, | |
432 | event, event_return); | |
433 | if (ret) { | |
434 | kmem_cache_free(event_cache, event_return); | |
435 | goto register_error; | |
436 | } | |
437 | /* Take 2 refs on the module: one per event. */ | |
438 | ret = try_module_get(event->desc->owner); | |
439 | WARN_ON_ONCE(!ret); | |
440 | ret = try_module_get(event->desc->owner); | |
441 | WARN_ON_ONCE(!ret); | |
a90917c3 | 442 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c MD |
443 | event_return); |
444 | if (ret) { | |
445 | kmem_cache_free(event_cache, event_return); | |
446 | module_put(event->desc->owner); | |
447 | module_put(event->desc->owner); | |
448 | goto statedump_error; | |
449 | } | |
450 | list_add(&event_return->list, &chan->session->events); | |
451 | break; | |
452 | } | |
ab2277d6 | 453 | case LTTNG_KERNEL_FUNCTION: |
30bdb6e4 | 454 | ret = lttng_ftrace_register(event_param->name, |
e0a7a7c4 MD |
455 | event_param->u.ftrace.symbol_name, |
456 | event); | |
457 | if (ret) | |
458 | goto register_error; | |
edeb3137 MD |
459 | ret = try_module_get(event->desc->owner); |
460 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 461 | break; |
1ec65de1 | 462 | case LTTNG_KERNEL_NOOP: |
259b6cb3 MD |
463 | event->desc = internal_desc; |
464 | if (!event->desc) | |
465 | goto register_error; | |
1ec65de1 | 466 | break; |
baf20995 MD |
467 | default: |
468 | WARN_ON_ONCE(1); | |
df07930b | 469 | goto register_error; |
baf20995 | 470 | } |
a90917c3 | 471 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
c099397a MD |
472 | if (ret) |
473 | goto statedump_error; | |
dda6a249 | 474 | list_add(&event->list, &chan->session->events); |
11b5a3c2 | 475 | mutex_unlock(&sessions_mutex); |
4e3c1b9b MD |
476 | return event; |
477 | ||
c099397a | 478 | statedump_error: |
259b6cb3 | 479 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 480 | register_error: |
11b5a3c2 | 481 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
482 | cache_error: |
483 | exist: | |
e5382b6d | 484 | full: |
4e3c1b9b MD |
485 | mutex_unlock(&sessions_mutex); |
486 | return NULL; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Only used internally at session destruction. | |
491 | */ | |
a90917c3 | 492 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 493 | { |
11b5a3c2 MD |
494 | int ret = -EINVAL; |
495 | ||
38d024ae | 496 | switch (event->instrumentation) { |
ab2277d6 | 497 | case LTTNG_KERNEL_TRACEPOINT: |
3a523f5b | 498 | ret = kabi_2635_tracepoint_probe_unregister(event->desc->name, |
85a9ca7f | 499 | event->desc->probe_callback, |
11b5a3c2 MD |
500 | event); |
501 | if (ret) | |
502 | return ret; | |
baf20995 | 503 | break; |
ab2277d6 | 504 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 505 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
506 | ret = 0; |
507 | break; | |
7371f44c MD |
508 | case LTTNG_KERNEL_KRETPROBE: |
509 | lttng_kretprobes_unregister(event); | |
510 | ret = 0; | |
511 | break; | |
ab2277d6 | 512 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
513 | lttng_ftrace_unregister(event); |
514 | ret = 0; | |
515 | break; | |
259b6cb3 MD |
516 | case LTTNG_KERNEL_NOOP: |
517 | ret = 0; | |
518 | break; | |
baf20995 MD |
519 | default: |
520 | WARN_ON_ONCE(1); | |
521 | } | |
dda6a249 MD |
522 | return ret; |
523 | } | |
524 | ||
525 | /* | |
526 | * Only used internally at session destruction. | |
527 | */ | |
be066e6c | 528 | static |
a90917c3 | 529 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 530 | { |
edeb3137 MD |
531 | switch (event->instrumentation) { |
532 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 533 | lttng_event_put(event->desc); |
edeb3137 MD |
534 | break; |
535 | case LTTNG_KERNEL_KPROBE: | |
536 | module_put(event->desc->owner); | |
537 | lttng_kprobes_destroy_private(event); | |
538 | break; | |
7371f44c MD |
539 | case LTTNG_KERNEL_KRETPROBE: |
540 | module_put(event->desc->owner); | |
541 | lttng_kretprobes_destroy_private(event); | |
542 | break; | |
edeb3137 MD |
543 | case LTTNG_KERNEL_FUNCTION: |
544 | module_put(event->desc->owner); | |
545 | lttng_ftrace_destroy_private(event); | |
546 | break; | |
259b6cb3 MD |
547 | case LTTNG_KERNEL_NOOP: |
548 | break; | |
edeb3137 MD |
549 | default: |
550 | WARN_ON_ONCE(1); | |
551 | } | |
dda6a249 | 552 | list_del(&event->list); |
8070f5c0 | 553 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 554 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
555 | } |
556 | ||
1ec3f75a | 557 | /* |
d83004aa JD |
558 | * Serialize at most one packet worth of metadata into a metadata |
559 | * channel. | |
1ec3f75a MD |
560 | * We have exclusive access to our metadata buffer (protected by the |
561 | * sessions_mutex), so we can do racy operations such as looking for | |
562 | * remaining space left in packet and write, since mutual exclusion | |
563 | * protects us from concurrent writes. | |
35097f36 JD |
564 | * Returns the number of bytes written in the channel, 0 if no data |
565 | * was written and a negative value on error. | |
1ec3f75a | 566 | */ |
b3b8072b MD |
567 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
568 | struct channel *chan) | |
d83004aa JD |
569 | { |
570 | struct lib_ring_buffer_ctx ctx; | |
571 | int ret = 0; | |
572 | size_t len, reserve_len; | |
573 | ||
f613e3e6 MD |
574 | /* |
575 | * Ensure we support mutiple get_next / put sequences followed | |
576 | * by put_next. | |
577 | */ | |
578 | WARN_ON(stream->metadata_in < stream->metadata_out); | |
579 | if (stream->metadata_in != stream->metadata_out) | |
580 | return 0; | |
581 | ||
d83004aa | 582 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 583 | stream->metadata_in; |
9de2c215 MD |
584 | if (!len) |
585 | return 0; | |
d83004aa | 586 | reserve_len = min_t(size_t, |
b3b8072b | 587 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 588 | len); |
b3b8072b | 589 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
590 | sizeof(char), -1); |
591 | /* | |
592 | * If reservation failed, return an error to the caller. | |
593 | */ | |
b3b8072b | 594 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
595 | if (ret != 0) { |
596 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
597 | goto end; | |
598 | } | |
b3b8072b | 599 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 600 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 601 | reserve_len); |
b3b8072b | 602 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 603 | stream->metadata_in += reserve_len; |
d83004aa JD |
604 | ret = reserve_len; |
605 | ||
606 | end: | |
607 | return ret; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Write the metadata to the metadata cache. | |
612 | * Must be called with sessions_mutex held. | |
613 | */ | |
a90917c3 | 614 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
615 | const char *fmt, ...) |
616 | { | |
c099397a | 617 | char *str; |
d83004aa | 618 | size_t len; |
c099397a | 619 | va_list ap; |
d83004aa | 620 | struct lttng_metadata_stream *stream; |
c099397a MD |
621 | |
622 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
623 | ||
624 | va_start(ap, fmt); | |
625 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
626 | va_end(ap); | |
627 | if (!str) | |
628 | return -ENOMEM; | |
629 | ||
1ec3f75a | 630 | len = strlen(str); |
d83004aa JD |
631 | if (session->metadata_cache->metadata_written + len > |
632 | session->metadata_cache->cache_alloc) { | |
633 | char *tmp_cache_realloc; | |
634 | unsigned int tmp_cache_alloc_size; | |
635 | ||
636 | tmp_cache_alloc_size = max_t(unsigned int, | |
637 | session->metadata_cache->cache_alloc + len, | |
638 | session->metadata_cache->cache_alloc << 1); | |
639 | tmp_cache_realloc = krealloc(session->metadata_cache->data, | |
640 | tmp_cache_alloc_size, GFP_KERNEL); | |
641 | if (!tmp_cache_realloc) | |
642 | goto err; | |
643 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; | |
644 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 645 | } |
d83004aa JD |
646 | memcpy(session->metadata_cache->data + |
647 | session->metadata_cache->metadata_written, | |
648 | str, len); | |
649 | session->metadata_cache->metadata_written += len; | |
c099397a | 650 | kfree(str); |
d83004aa JD |
651 | |
652 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
653 | wake_up_interruptible(&stream->read_wait); | |
654 | ||
655 | return 0; | |
656 | ||
657 | err: | |
658 | kfree(str); | |
659 | return -ENOMEM; | |
c099397a MD |
660 | } |
661 | ||
d83004aa JD |
662 | /* |
663 | * Must be called with sessions_mutex held. | |
664 | */ | |
c099397a | 665 | static |
a90917c3 | 666 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 667 | const struct lttng_event_field *field) |
c099397a | 668 | { |
c099397a | 669 | int ret = 0; |
c099397a | 670 | |
8070f5c0 MD |
671 | switch (field->type.atype) { |
672 | case atype_integer: | |
673 | ret = lttng_metadata_printf(session, | |
244465ab | 674 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
675 | field->type.u.basic.integer.size, |
676 | field->type.u.basic.integer.alignment, | |
677 | field->type.u.basic.integer.signedness, | |
678 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
679 | ? "none" | |
680 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
681 | ? "UTF8" | |
682 | : "ASCII", | |
683 | field->type.u.basic.integer.base, | |
c099397a | 684 | #ifdef __BIG_ENDIAN |
8070f5c0 | 685 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 686 | #else |
8070f5c0 | 687 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 688 | #endif |
8070f5c0 MD |
689 | field->name); |
690 | break; | |
691 | case atype_enum: | |
692 | ret = lttng_metadata_printf(session, | |
244465ab | 693 | " %s _%s;\n", |
8070f5c0 MD |
694 | field->type.u.basic.enumeration.name, |
695 | field->name); | |
696 | break; | |
697 | case atype_array: | |
698 | { | |
699 | const struct lttng_basic_type *elem_type; | |
700 | ||
701 | elem_type = &field->type.u.array.elem_type; | |
702 | ret = lttng_metadata_printf(session, | |
244465ab | 703 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
704 | elem_type->u.basic.integer.size, |
705 | elem_type->u.basic.integer.alignment, | |
706 | elem_type->u.basic.integer.signedness, | |
707 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
708 | ? "none" | |
709 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
710 | ? "UTF8" | |
711 | : "ASCII", | |
712 | elem_type->u.basic.integer.base, | |
8fa75f34 | 713 | #ifdef __BIG_ENDIAN |
8070f5c0 | 714 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 715 | #else |
8070f5c0 | 716 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 717 | #endif |
8070f5c0 MD |
718 | field->name, field->type.u.array.length); |
719 | break; | |
720 | } | |
721 | case atype_sequence: | |
722 | { | |
723 | const struct lttng_basic_type *elem_type; | |
724 | const struct lttng_basic_type *length_type; | |
725 | ||
726 | elem_type = &field->type.u.sequence.elem_type; | |
727 | length_type = &field->type.u.sequence.length_type; | |
728 | ret = lttng_metadata_printf(session, | |
729 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 730 | length_type->u.basic.integer.size, |
32257272 | 731 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
732 | length_type->u.basic.integer.signedness, |
733 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
734 | ? "none" | |
0635cdd4 | 735 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 736 | ? "UTF8" |
0635cdd4 | 737 | : "ASCII"), |
8070f5c0 | 738 | length_type->u.basic.integer.base, |
e0a7a7c4 | 739 | #ifdef __BIG_ENDIAN |
8070f5c0 | 740 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 741 | #else |
0635cdd4 | 742 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 743 | #endif |
27d2368e MD |
744 | field->name); |
745 | if (ret) | |
746 | return ret; | |
747 | ||
748 | ret = lttng_metadata_printf(session, | |
244465ab | 749 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 750 | elem_type->u.basic.integer.size, |
32257272 | 751 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
752 | elem_type->u.basic.integer.signedness, |
753 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
754 | ? "none" | |
0635cdd4 | 755 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 756 | ? "UTF8" |
0635cdd4 | 757 | : "ASCII"), |
8070f5c0 | 758 | elem_type->u.basic.integer.base, |
8fa75f34 | 759 | #ifdef __BIG_ENDIAN |
8070f5c0 | 760 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 761 | #else |
8070f5c0 | 762 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 763 | #endif |
8070f5c0 | 764 | field->name, |
27d2368e | 765 | field->name); |
8070f5c0 MD |
766 | break; |
767 | } | |
c099397a | 768 | |
8070f5c0 MD |
769 | case atype_string: |
770 | /* Default encoding is UTF8 */ | |
771 | ret = lttng_metadata_printf(session, | |
244465ab | 772 | " string%s _%s;\n", |
8070f5c0 MD |
773 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
774 | " { encoding = ASCII; }" : "", | |
775 | field->name); | |
776 | break; | |
777 | default: | |
778 | WARN_ON_ONCE(1); | |
779 | return -EINVAL; | |
780 | } | |
781 | return ret; | |
782 | } | |
783 | ||
784 | static | |
a90917c3 | 785 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
786 | struct lttng_ctx *ctx) |
787 | { | |
788 | int ret = 0; | |
789 | int i; | |
790 | ||
791 | if (!ctx) | |
792 | return 0; | |
793 | for (i = 0; i < ctx->nr_fields; i++) { | |
794 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
795 | ||
a90917c3 | 796 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
797 | if (ret) |
798 | return ret; | |
799 | } | |
800 | return ret; | |
801 | } | |
802 | ||
803 | static | |
a90917c3 MD |
804 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
805 | struct lttng_event *event) | |
8070f5c0 MD |
806 | { |
807 | const struct lttng_event_desc *desc = event->desc; | |
808 | int ret = 0; | |
809 | int i; | |
810 | ||
811 | for (i = 0; i < desc->nr_fields; i++) { | |
812 | const struct lttng_event_field *field = &desc->fields[i]; | |
813 | ||
a90917c3 | 814 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
815 | if (ret) |
816 | return ret; | |
c099397a MD |
817 | } |
818 | return ret; | |
819 | } | |
820 | ||
d83004aa JD |
821 | /* |
822 | * Must be called with sessions_mutex held. | |
823 | */ | |
c099397a | 824 | static |
a90917c3 MD |
825 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
826 | struct lttng_channel *chan, | |
827 | struct lttng_event *event) | |
c099397a MD |
828 | { |
829 | int ret = 0; | |
830 | ||
831 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
832 | return 0; | |
d83004aa | 833 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
834 | return 0; |
835 | ||
836 | ret = lttng_metadata_printf(session, | |
837 | "event {\n" | |
838 | " name = %s;\n" | |
839 | " id = %u;\n" | |
b9074a1b | 840 | " stream_id = %u;\n", |
c099397a MD |
841 | event->desc->name, |
842 | event->id, | |
843 | event->chan->id); | |
844 | if (ret) | |
845 | goto end; | |
846 | ||
b9074a1b MD |
847 | if (event->ctx) { |
848 | ret = lttng_metadata_printf(session, | |
849 | " context := struct {\n"); | |
850 | if (ret) | |
851 | goto end; | |
852 | } | |
a90917c3 | 853 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
854 | if (ret) |
855 | goto end; | |
b9074a1b MD |
856 | if (event->ctx) { |
857 | ret = lttng_metadata_printf(session, | |
858 | " };\n"); | |
859 | if (ret) | |
860 | goto end; | |
861 | } | |
8070f5c0 MD |
862 | |
863 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
864 | " fields := struct {\n" |
865 | ); | |
866 | if (ret) | |
867 | goto end; | |
868 | ||
a90917c3 | 869 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
870 | if (ret) |
871 | goto end; | |
872 | ||
873 | /* | |
874 | * LTTng space reservation can only reserve multiples of the | |
875 | * byte size. | |
876 | */ | |
877 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
878 | " };\n" |
879 | "};\n\n"); | |
c099397a MD |
880 | if (ret) |
881 | goto end; | |
882 | ||
c099397a MD |
883 | event->metadata_dumped = 1; |
884 | end: | |
885 | return ret; | |
886 | ||
887 | } | |
888 | ||
d83004aa JD |
889 | /* |
890 | * Must be called with sessions_mutex held. | |
891 | */ | |
c099397a | 892 | static |
a90917c3 MD |
893 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
894 | struct lttng_channel *chan) | |
c099397a MD |
895 | { |
896 | int ret = 0; | |
897 | ||
898 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
899 | return 0; | |
d83004aa JD |
900 | |
901 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
902 | return 0; |
903 | ||
904 | WARN_ON_ONCE(!chan->header_type); | |
905 | ret = lttng_metadata_printf(session, | |
906 | "stream {\n" | |
907 | " id = %u;\n" | |
9115fbdc | 908 | " event.header := %s;\n" |
b9074a1b | 909 | " packet.context := struct packet_context;\n", |
c099397a MD |
910 | chan->id, |
911 | chan->header_type == 1 ? "struct event_header_compact" : | |
912 | "struct event_header_large"); | |
913 | if (ret) | |
914 | goto end; | |
915 | ||
b9074a1b MD |
916 | if (chan->ctx) { |
917 | ret = lttng_metadata_printf(session, | |
918 | " event.context := struct {\n"); | |
919 | if (ret) | |
920 | goto end; | |
921 | } | |
a90917c3 | 922 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
923 | if (ret) |
924 | goto end; | |
b9074a1b MD |
925 | if (chan->ctx) { |
926 | ret = lttng_metadata_printf(session, | |
927 | " };\n"); | |
928 | if (ret) | |
929 | goto end; | |
930 | } | |
8070f5c0 MD |
931 | |
932 | ret = lttng_metadata_printf(session, | |
b9074a1b | 933 | "};\n\n"); |
8070f5c0 | 934 | |
c099397a MD |
935 | chan->metadata_dumped = 1; |
936 | end: | |
937 | return ret; | |
938 | } | |
939 | ||
d83004aa JD |
940 | /* |
941 | * Must be called with sessions_mutex held. | |
942 | */ | |
9115fbdc | 943 | static |
a90917c3 | 944 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
945 | { |
946 | return lttng_metadata_printf(session, | |
947 | "struct packet_context {\n" | |
a3ccff4f MD |
948 | " uint64_clock_monotonic_t timestamp_begin;\n" |
949 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
950 | " uint64_t content_size;\n" |
951 | " uint64_t packet_size;\n" | |
a9afe705 | 952 | " unsigned long events_discarded;\n" |
9115fbdc | 953 | " uint32_t cpu_id;\n" |
c6dfdf6f | 954 | "};\n\n" |
9115fbdc MD |
955 | ); |
956 | } | |
957 | ||
958 | /* | |
959 | * Compact header: | |
960 | * id: range: 0 - 30. | |
961 | * id 31 is reserved to indicate an extended header. | |
962 | * | |
963 | * Large header: | |
964 | * id: range: 0 - 65534. | |
965 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
966 | * |
967 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
968 | */ |
969 | static | |
a90917c3 | 970 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
971 | { |
972 | return lttng_metadata_printf(session, | |
973 | "struct event_header_compact {\n" | |
974 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
975 | " variant <id> {\n" | |
976 | " struct {\n" | |
a3ccff4f | 977 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
978 | " } compact;\n" |
979 | " struct {\n" | |
980 | " uint32_t id;\n" | |
a3ccff4f | 981 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
982 | " } extended;\n" |
983 | " } v;\n" | |
984 | "} align(%u);\n" | |
985 | "\n" | |
986 | "struct event_header_large {\n" | |
987 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
988 | " variant <id> {\n" | |
989 | " struct {\n" | |
a3ccff4f | 990 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
991 | " } compact;\n" |
992 | " struct {\n" | |
993 | " uint32_t id;\n" | |
a3ccff4f | 994 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
995 | " } extended;\n" |
996 | " } v;\n" | |
997 | "} align(%u);\n\n", | |
a90917c3 MD |
998 | lttng_alignof(uint32_t) * CHAR_BIT, |
999 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1000 | ); |
1001 | } | |
1002 | ||
a3ccff4f MD |
1003 | /* |
1004 | * Approximation of NTP time of day to clock monotonic correlation, | |
1005 | * taken at start of trace. | |
1006 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1007 | * in future versions. | |
1008 | */ | |
1009 | static | |
1010 | uint64_t measure_clock_offset(void) | |
1011 | { | |
1012 | uint64_t offset, monotonic[2], realtime; | |
1013 | struct timespec rts = { 0, 0 }; | |
1014 | unsigned long flags; | |
1015 | ||
1016 | /* Disable interrupts to increase correlation precision. */ | |
1017 | local_irq_save(flags); | |
1018 | monotonic[0] = trace_clock_read64(); | |
1019 | getnstimeofday(&rts); | |
1020 | monotonic[1] = trace_clock_read64(); | |
1021 | local_irq_restore(flags); | |
1022 | ||
1023 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
57be518d | 1024 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f MD |
1025 | realtime += rts.tv_nsec; |
1026 | offset = realtime - offset; | |
1027 | return offset; | |
1028 | } | |
1029 | ||
c099397a MD |
1030 | /* |
1031 | * Output metadata into this session's metadata buffers. | |
d83004aa | 1032 | * Must be called with sessions_mutex held. |
c099397a MD |
1033 | */ |
1034 | static | |
a90917c3 | 1035 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 1036 | { |
30bdb6e4 | 1037 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 1038 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
1039 | struct lttng_channel *chan; |
1040 | struct lttng_event *event; | |
c099397a MD |
1041 | int ret = 0; |
1042 | ||
1043 | if (!ACCESS_ONCE(session->active)) | |
1044 | return 0; | |
1045 | if (session->metadata_dumped) | |
1046 | goto skip_session; | |
c099397a | 1047 | |
d793d5e1 | 1048 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
1049 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
1050 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1051 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1052 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1053 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
1054 | |
1055 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1056 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
1057 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1058 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1059 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 1060 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
1061 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1062 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
1063 | "\n" |
1064 | "trace {\n" | |
1065 | " major = %u;\n" | |
1066 | " minor = %u;\n" | |
30bdb6e4 | 1067 | " uuid = \"%s\";\n" |
d793d5e1 MD |
1068 | " byte_order = %s;\n" |
1069 | " packet.header := struct {\n" | |
1070 | " uint32_t magic;\n" | |
1ec3f75a | 1071 | " uint8_t uuid[16];\n" |
d793d5e1 | 1072 | " uint32_t stream_id;\n" |
0eb25f58 | 1073 | " };\n" |
d793d5e1 | 1074 | "};\n\n", |
a90917c3 MD |
1075 | lttng_alignof(uint8_t) * CHAR_BIT, |
1076 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1077 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1078 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
1079 | sizeof(unsigned long) * CHAR_BIT, |
1080 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
1081 | CTF_SPEC_MAJOR, |
1082 | CTF_SPEC_MINOR, | |
d793d5e1 MD |
1083 | uuid_s, |
1084 | #ifdef __BIG_ENDIAN | |
1085 | "be" | |
1086 | #else | |
1087 | "le" | |
1088 | #endif | |
1089 | ); | |
1090 | if (ret) | |
1091 | goto end; | |
1092 | ||
99dc9597 MD |
1093 | ret = lttng_metadata_printf(session, |
1094 | "env {\n" | |
a6058143 | 1095 | " hostname = \"%s\";\n" |
c6c9e10f | 1096 | " domain = \"kernel\";\n" |
99dc9597 | 1097 | " sysname = \"%s\";\n" |
c6c9e10f MD |
1098 | " kernel_release = \"%s\";\n" |
1099 | " kernel_version = \"%s\";\n" | |
1100 | " tracer_name = \"lttng-modules\";\n" | |
1101 | " tracer_major = %d;\n" | |
1102 | " tracer_minor = %d;\n" | |
1103 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 1104 | "};\n\n", |
3d0d43db | 1105 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
1106 | utsname()->sysname, |
1107 | utsname()->release, | |
c6c9e10f MD |
1108 | utsname()->version, |
1109 | LTTNG_MODULES_MAJOR_VERSION, | |
1110 | LTTNG_MODULES_MINOR_VERSION, | |
1111 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
1112 | ); |
1113 | if (ret) | |
1114 | goto end; | |
1115 | ||
a3ccff4f MD |
1116 | ret = lttng_metadata_printf(session, |
1117 | "clock {\n" | |
a82c63f1 MD |
1118 | " name = %s;\n", |
1119 | "monotonic" | |
1120 | ); | |
1121 | if (ret) | |
1122 | goto end; | |
1123 | ||
1124 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1125 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 1126 | " uuid = \"%s\";\n", |
a82c63f1 MD |
1127 | clock_uuid_s |
1128 | ); | |
1129 | if (ret) | |
1130 | goto end; | |
1131 | } | |
1132 | ||
1133 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
1134 | " description = \"Monotonic Clock\";\n" |
1135 | " freq = %llu; /* Frequency, in Hz */\n" | |
1136 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1137 | " offset = %llu;\n" | |
1138 | "};\n\n", | |
a3ccff4f MD |
1139 | (unsigned long long) trace_clock_freq(), |
1140 | (unsigned long long) measure_clock_offset() | |
1141 | ); | |
1142 | if (ret) | |
1143 | goto end; | |
1144 | ||
1145 | ret = lttng_metadata_printf(session, | |
1146 | "typealias integer {\n" | |
1147 | " size = 27; align = 1; signed = false;\n" | |
1148 | " map = clock.monotonic.value;\n" | |
1149 | "} := uint27_clock_monotonic_t;\n" | |
1150 | "\n" | |
1151 | "typealias integer {\n" | |
1152 | " size = 32; align = %u; signed = false;\n" | |
1153 | " map = clock.monotonic.value;\n" | |
1154 | "} := uint32_clock_monotonic_t;\n" | |
1155 | "\n" | |
1156 | "typealias integer {\n" | |
1157 | " size = 64; align = %u; signed = false;\n" | |
1158 | " map = clock.monotonic.value;\n" | |
1159 | "} := uint64_clock_monotonic_t;\n\n", | |
1160 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1161 | lttng_alignof(uint64_t) * CHAR_BIT | |
1162 | ); | |
1163 | if (ret) | |
1164 | goto end; | |
1165 | ||
a90917c3 | 1166 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
1167 | if (ret) |
1168 | goto end; | |
1169 | ||
a90917c3 | 1170 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
1171 | if (ret) |
1172 | goto end; | |
1173 | ||
c099397a MD |
1174 | skip_session: |
1175 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 1176 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
1177 | if (ret) |
1178 | goto end; | |
1179 | } | |
1180 | ||
1181 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 1182 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
1183 | if (ret) |
1184 | goto end; | |
1185 | } | |
1186 | session->metadata_dumped = 1; | |
1187 | end: | |
1188 | return ret; | |
1189 | } | |
1190 | ||
c0e31d2e | 1191 | /** |
a90917c3 | 1192 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
1193 | * @transport: transport structure |
1194 | * | |
1195 | * Registers a transport which can be used as output to extract the data out of | |
1196 | * LTTng. The module calling this registration function must ensure that no | |
1197 | * trap-inducing code will be executed by the transport functions. E.g. | |
1198 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
1199 | * is made visible to the transport function. This registration acts as a | |
1200 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
1201 | * after its registration must it synchronize the TLBs. | |
1202 | */ | |
a90917c3 | 1203 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
1204 | { |
1205 | /* | |
1206 | * Make sure no page fault can be triggered by the module about to be | |
1207 | * registered. We deal with this here so we don't have to call | |
1208 | * vmalloc_sync_all() in each module's init. | |
1209 | */ | |
6d2a620c | 1210 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
1211 | |
1212 | mutex_lock(&sessions_mutex); | |
a90917c3 | 1213 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
1214 | mutex_unlock(&sessions_mutex); |
1215 | } | |
a90917c3 | 1216 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
1217 | |
1218 | /** | |
a90917c3 | 1219 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
1220 | * @transport: transport structure |
1221 | */ | |
a90917c3 | 1222 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
1223 | { |
1224 | mutex_lock(&sessions_mutex); | |
1225 | list_del(&transport->node); | |
1226 | mutex_unlock(&sessions_mutex); | |
1227 | } | |
a90917c3 | 1228 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 1229 | |
a90917c3 | 1230 | static int __init lttng_events_init(void) |
4e3c1b9b | 1231 | { |
1c25284c MD |
1232 | int ret; |
1233 | ||
a90917c3 | 1234 | event_cache = KMEM_CACHE(lttng_event, 0); |
11b5a3c2 | 1235 | if (!event_cache) |
4e3c1b9b | 1236 | return -ENOMEM; |
80996790 | 1237 | ret = lttng_abi_init(); |
02119ee5 MD |
1238 | if (ret) |
1239 | goto error_abi; | |
4e3c1b9b | 1240 | return 0; |
02119ee5 | 1241 | error_abi: |
1c25284c MD |
1242 | kmem_cache_destroy(event_cache); |
1243 | return ret; | |
4e3c1b9b MD |
1244 | } |
1245 | ||
a90917c3 | 1246 | module_init(lttng_events_init); |
11b5a3c2 | 1247 | |
a90917c3 | 1248 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 1249 | { |
a90917c3 | 1250 | struct lttng_session *session, *tmpsession; |
92e94819 | 1251 | |
80996790 | 1252 | lttng_abi_exit(); |
92e94819 | 1253 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 1254 | lttng_session_destroy(session); |
11b5a3c2 | 1255 | kmem_cache_destroy(event_cache); |
4e3c1b9b | 1256 | } |
92e94819 | 1257 | |
a90917c3 | 1258 | module_exit(lttng_events_exit); |
11b5a3c2 | 1259 | |
92e94819 MD |
1260 | MODULE_LICENSE("GPL and additional rights"); |
1261 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1262 | MODULE_DESCRIPTION("LTTng Events"); |