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 | ||
389d7070 MD |
23 | /* |
24 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
25 | * overrides a function with a define. | |
26 | */ | |
27 | #include "wrapper/page_alloc.h" | |
28 | ||
4e3c1b9b | 29 | #include <linux/module.h> |
c0e31d2e MD |
30 | #include <linux/mutex.h> |
31 | #include <linux/sched.h> | |
11b5a3c2 | 32 | #include <linux/slab.h> |
c099397a | 33 | #include <linux/jiffies.h> |
99dc9597 | 34 | #include <linux/utsname.h> |
abc0446a | 35 | #include <linux/err.h> |
7e6f9ef6 MD |
36 | #include <linux/seq_file.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/anon_inodes.h> | |
39 | #include "wrapper/file.h" | |
3c997079 | 40 | #include <linux/jhash.h> |
8c6e7f13 | 41 | #include <linux/uaccess.h> |
a606b6e8 | 42 | #include <linux/vmalloc.h> |
3c997079 | 43 | |
a864fb02 | 44 | #include "wrapper/uuid.h" |
b13f3ebe | 45 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
a82c63f1 | 46 | #include "wrapper/random.h" |
3a523f5b | 47 | #include "wrapper/tracepoint.h" |
f934e302 | 48 | #include "wrapper/list.h" |
b8590f40 | 49 | #include "lttng-kernel-version.h" |
a90917c3 MD |
50 | #include "lttng-events.h" |
51 | #include "lttng-tracer.h" | |
6dccd6c1 | 52 | #include "lttng-abi-old.h" |
9928f844 | 53 | #include "lttng-endian.h" |
c74b9c6f | 54 | #include "wrapper/vzalloc.h" |
088b3346 MD |
55 | #include "wrapper/ringbuffer/backend.h" |
56 | #include "wrapper/ringbuffer/frontend.h" | |
4e3c1b9b | 57 | |
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
62 | /* |
63 | * Protect the sessions and metadata caches. | |
64 | */ | |
4e3c1b9b MD |
65 | static DEFINE_MUTEX(sessions_mutex); |
66 | static struct kmem_cache *event_cache; | |
67 | ||
3c997079 MD |
68 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
69 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
70 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
71 | ||
a90917c3 MD |
72 | static void _lttng_event_destroy(struct lttng_event *event); |
73 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
74 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 75 | static |
a90917c3 MD |
76 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
77 | struct lttng_channel *chan, | |
78 | struct lttng_event *event); | |
c099397a | 79 | static |
a90917c3 | 80 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
c099397a | 83 | |
c099397a | 84 | void synchronize_trace(void) |
abcca994 MD |
85 | { |
86 | synchronize_sched(); | |
b8590f40 MD |
87 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
88 | #ifdef CONFIG_PREEMPT_RT_FULL | |
89 | synchronize_rcu(); | |
90 | #endif | |
91 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
92 | #ifdef CONFIG_PREEMPT_RT |
93 | synchronize_rcu(); | |
94 | #endif | |
b8590f40 | 95 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
96 | } |
97 | ||
3c997079 MD |
98 | void lttng_lock_sessions(void) |
99 | { | |
100 | mutex_lock(&sessions_mutex); | |
101 | } | |
102 | ||
103 | void lttng_unlock_sessions(void) | |
104 | { | |
105 | mutex_unlock(&sessions_mutex); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Called with sessions lock held. | |
110 | */ | |
111 | int lttng_session_active(void) | |
112 | { | |
113 | struct lttng_session *iter; | |
114 | ||
115 | list_for_each_entry(iter, &sessions, list) { | |
116 | if (iter->active) | |
117 | return 1; | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
a90917c3 | 122 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 123 | { |
a90917c3 | 124 | struct lttng_session *session; |
d83004aa | 125 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 126 | int i; |
4e3c1b9b MD |
127 | |
128 | mutex_lock(&sessions_mutex); | |
a90917c3 | 129 | session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 130 | if (!session) |
d83004aa | 131 | goto err; |
4e3c1b9b | 132 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 133 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 134 | uuid_le_gen(&session->uuid); |
d83004aa JD |
135 | |
136 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
137 | GFP_KERNEL); | |
138 | if (!metadata_cache) | |
139 | goto err_free_session; | |
c74b9c6f | 140 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
141 | if (!metadata_cache->data) |
142 | goto err_free_cache; | |
143 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
144 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 145 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
146 | session->metadata_cache = metadata_cache; |
147 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
148 | memcpy(&metadata_cache->uuid, &session->uuid, |
149 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
150 | INIT_LIST_HEAD(&session->enablers_head); |
151 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
152 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
153 | list_add(&session->list, &sessions); |
154 | mutex_unlock(&sessions_mutex); | |
155 | return session; | |
d83004aa JD |
156 | |
157 | err_free_cache: | |
158 | kfree(metadata_cache); | |
159 | err_free_session: | |
160 | kfree(session); | |
161 | err: | |
162 | mutex_unlock(&sessions_mutex); | |
163 | return NULL; | |
164 | } | |
165 | ||
166 | void metadata_cache_destroy(struct kref *kref) | |
167 | { | |
168 | struct lttng_metadata_cache *cache = | |
169 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 170 | vfree(cache->data); |
d83004aa | 171 | kfree(cache); |
4e3c1b9b MD |
172 | } |
173 | ||
a90917c3 | 174 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 175 | { |
a90917c3 MD |
176 | struct lttng_channel *chan, *tmpchan; |
177 | struct lttng_event *event, *tmpevent; | |
d83004aa | 178 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 179 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 180 | int ret; |
4e3c1b9b MD |
181 | |
182 | mutex_lock(&sessions_mutex); | |
52fc2e1f | 183 | ACCESS_ONCE(session->active) = 0; |
1ec65de1 MD |
184 | list_for_each_entry(chan, &session->chan, list) { |
185 | ret = lttng_syscalls_unregister(chan); | |
186 | WARN_ON(ret); | |
187 | } | |
dda6a249 | 188 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 189 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
190 | WARN_ON(ret); |
191 | } | |
abcca994 | 192 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
193 | list_for_each_entry_safe(enabler, tmpenabler, |
194 | &session->enablers_head, node) | |
195 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 196 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 197 | _lttng_event_destroy(event); |
d83004aa JD |
198 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
199 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 200 | _lttng_channel_destroy(chan); |
d83004aa JD |
201 | } |
202 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
203 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
204 | if (session->pid_tracker) |
205 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 206 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
207 | list_del(&session->list); |
208 | mutex_unlock(&sessions_mutex); | |
209 | kfree(session); | |
210 | } | |
211 | ||
a90917c3 | 212 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
213 | { |
214 | int ret = 0; | |
a90917c3 | 215 | struct lttng_channel *chan; |
c0e31d2e MD |
216 | |
217 | mutex_lock(&sessions_mutex); | |
218 | if (session->active) { | |
219 | ret = -EBUSY; | |
220 | goto end; | |
221 | } | |
c099397a | 222 | |
3c997079 MD |
223 | /* Set transient enabler state to "enabled" */ |
224 | session->tstate = 1; | |
225 | ||
c099397a MD |
226 | /* |
227 | * Snapshot the number of events per channel to know the type of header | |
228 | * we need to use. | |
229 | */ | |
230 | list_for_each_entry(chan, &session->chan, list) { | |
231 | if (chan->header_type) | |
232 | continue; /* don't change it if session stop/restart */ | |
233 | if (chan->free_event_id < 31) | |
234 | chan->header_type = 1; /* compact */ | |
235 | else | |
236 | chan->header_type = 2; /* large */ | |
237 | } | |
238 | ||
3c997079 MD |
239 | /* We need to sync enablers with session before activation. */ |
240 | lttng_session_sync_enablers(session); | |
241 | ||
088b3346 MD |
242 | /* Clear each stream's quiescent state. */ |
243 | list_for_each_entry(chan, &session->chan, list) | |
244 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
245 | ||
52fc2e1f | 246 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 247 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 248 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
249 | if (ret) { |
250 | ACCESS_ONCE(session->active) = 0; | |
251 | goto end; | |
252 | } | |
253 | ret = lttng_statedump_start(session); | |
360f38ea | 254 | if (ret) |
c099397a | 255 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
256 | end: |
257 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 258 | return ret; |
c0e31d2e MD |
259 | } |
260 | ||
a90917c3 | 261 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
262 | { |
263 | int ret = 0; | |
088b3346 | 264 | struct lttng_channel *chan; |
c0e31d2e MD |
265 | |
266 | mutex_lock(&sessions_mutex); | |
267 | if (!session->active) { | |
268 | ret = -EBUSY; | |
269 | goto end; | |
270 | } | |
52fc2e1f | 271 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
272 | |
273 | /* Set transient enabler state to "disabled" */ | |
274 | session->tstate = 0; | |
275 | lttng_session_sync_enablers(session); | |
088b3346 MD |
276 | |
277 | /* Set each stream's quiescent state. */ | |
278 | list_for_each_entry(chan, &session->chan, list) | |
279 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
c0e31d2e MD |
280 | end: |
281 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 282 | return ret; |
c0e31d2e MD |
283 | } |
284 | ||
a90917c3 | 285 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 286 | { |
3c997079 | 287 | int ret = 0; |
e64957da | 288 | |
3c997079 MD |
289 | mutex_lock(&sessions_mutex); |
290 | if (channel->channel_type == METADATA_CHANNEL) { | |
291 | ret = -EPERM; | |
292 | goto end; | |
293 | } | |
294 | if (channel->enabled) { | |
295 | ret = -EEXIST; | |
296 | goto end; | |
297 | } | |
298 | /* Set transient enabler state to "enabled" */ | |
299 | channel->tstate = 1; | |
300 | lttng_session_sync_enablers(channel->session); | |
301 | /* Set atomically the state to "enabled" */ | |
302 | ACCESS_ONCE(channel->enabled) = 1; | |
303 | end: | |
304 | mutex_unlock(&sessions_mutex); | |
305 | return ret; | |
e64957da MD |
306 | } |
307 | ||
a90917c3 | 308 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 309 | { |
3c997079 | 310 | int ret = 0; |
e64957da | 311 | |
3c997079 MD |
312 | mutex_lock(&sessions_mutex); |
313 | if (channel->channel_type == METADATA_CHANNEL) { | |
314 | ret = -EPERM; | |
315 | goto end; | |
316 | } | |
317 | if (!channel->enabled) { | |
318 | ret = -EEXIST; | |
319 | goto end; | |
320 | } | |
321 | /* Set atomically the state to "disabled" */ | |
322 | ACCESS_ONCE(channel->enabled) = 0; | |
323 | /* Set transient enabler state to "enabled" */ | |
324 | channel->tstate = 0; | |
325 | lttng_session_sync_enablers(channel->session); | |
326 | end: | |
327 | mutex_unlock(&sessions_mutex); | |
328 | return ret; | |
e64957da MD |
329 | } |
330 | ||
a90917c3 | 331 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 332 | { |
3c997079 | 333 | int ret = 0; |
e64957da | 334 | |
3c997079 MD |
335 | mutex_lock(&sessions_mutex); |
336 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
337 | ret = -EPERM; | |
338 | goto end; | |
339 | } | |
340 | if (event->enabled) { | |
341 | ret = -EEXIST; | |
342 | goto end; | |
343 | } | |
4598b13b MD |
344 | switch (event->instrumentation) { |
345 | case LTTNG_KERNEL_TRACEPOINT: | |
346 | case LTTNG_KERNEL_SYSCALL: | |
347 | ret = -EINVAL; | |
348 | break; | |
349 | case LTTNG_KERNEL_KPROBE: | |
350 | case LTTNG_KERNEL_FUNCTION: | |
351 | case LTTNG_KERNEL_NOOP: | |
352 | ACCESS_ONCE(event->enabled) = 1; | |
353 | break; | |
354 | case LTTNG_KERNEL_KRETPROBE: | |
355 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
356 | break; | |
357 | default: | |
358 | WARN_ON_ONCE(1); | |
359 | ret = -EINVAL; | |
360 | } | |
3c997079 MD |
361 | end: |
362 | mutex_unlock(&sessions_mutex); | |
363 | return ret; | |
e64957da MD |
364 | } |
365 | ||
a90917c3 | 366 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 367 | { |
3c997079 | 368 | int ret = 0; |
e64957da | 369 | |
3c997079 MD |
370 | mutex_lock(&sessions_mutex); |
371 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
372 | ret = -EPERM; | |
373 | goto end; | |
374 | } | |
375 | if (!event->enabled) { | |
376 | ret = -EEXIST; | |
377 | goto end; | |
378 | } | |
4598b13b MD |
379 | switch (event->instrumentation) { |
380 | case LTTNG_KERNEL_TRACEPOINT: | |
381 | case LTTNG_KERNEL_SYSCALL: | |
382 | ret = -EINVAL; | |
383 | break; | |
384 | case LTTNG_KERNEL_KPROBE: | |
385 | case LTTNG_KERNEL_FUNCTION: | |
386 | case LTTNG_KERNEL_NOOP: | |
387 | ACCESS_ONCE(event->enabled) = 0; | |
388 | break; | |
389 | case LTTNG_KERNEL_KRETPROBE: | |
390 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
391 | break; | |
392 | default: | |
393 | WARN_ON_ONCE(1); | |
394 | ret = -EINVAL; | |
395 | } | |
3c997079 MD |
396 | end: |
397 | mutex_unlock(&sessions_mutex); | |
398 | return ret; | |
e64957da MD |
399 | } |
400 | ||
a90917c3 | 401 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 402 | { |
a90917c3 | 403 | struct lttng_transport *transport; |
f3d01b96 | 404 | |
a90917c3 | 405 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
406 | if (!strcmp(transport->name, name)) |
407 | return transport; | |
408 | } | |
409 | return NULL; | |
410 | } | |
411 | ||
a90917c3 | 412 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
413 | const char *transport_name, |
414 | void *buf_addr, | |
4e3c1b9b MD |
415 | size_t subbuf_size, size_t num_subbuf, |
416 | unsigned int switch_timer_interval, | |
d83004aa JD |
417 | unsigned int read_timer_interval, |
418 | enum channel_type channel_type) | |
4e3c1b9b | 419 | { |
a90917c3 MD |
420 | struct lttng_channel *chan; |
421 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
422 | |
423 | mutex_lock(&sessions_mutex); | |
d83004aa | 424 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 425 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 426 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
427 | if (!transport) { |
428 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
429 | transport_name); | |
c0e31d2e | 430 | goto notransport; |
f3d01b96 | 431 | } |
a33c9927 MD |
432 | if (!try_module_get(transport->owner)) { |
433 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
434 | goto notransport; | |
435 | } | |
a90917c3 | 436 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 437 | if (!chan) |
c0e31d2e | 438 | goto nomem; |
4e3c1b9b | 439 | chan->session = session; |
05d32c64 | 440 | chan->id = session->free_chan_id++; |
3b731ab1 | 441 | chan->ops = &transport->ops; |
125b4df4 MD |
442 | /* |
443 | * Note: the channel creation op already writes into the packet | |
444 | * headers. Therefore the "chan" information used as input | |
445 | * should be already accessible. | |
446 | */ | |
5f5ddf01 MD |
447 | chan->chan = transport->ops.channel_create(transport_name, |
448 | chan, buf_addr, subbuf_size, num_subbuf, | |
449 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
450 | if (!chan->chan) |
451 | goto create_error; | |
3c997079 | 452 | chan->tstate = 1; |
e64957da | 453 | chan->enabled = 1; |
a33c9927 | 454 | chan->transport = transport; |
d83004aa | 455 | chan->channel_type = channel_type; |
4e3c1b9b MD |
456 | list_add(&chan->list, &session->chan); |
457 | mutex_unlock(&sessions_mutex); | |
458 | return chan; | |
459 | ||
f3d01b96 MD |
460 | create_error: |
461 | kfree(chan); | |
c0e31d2e | 462 | nomem: |
a33c9927 MD |
463 | if (transport) |
464 | module_put(transport->owner); | |
c0e31d2e | 465 | notransport: |
e5382b6d | 466 | active: |
4e3c1b9b MD |
467 | mutex_unlock(&sessions_mutex); |
468 | return NULL; | |
469 | } | |
470 | ||
471 | /* | |
d83004aa JD |
472 | * Only used internally at session destruction for per-cpu channels, and |
473 | * when metadata channel is released. | |
474 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 475 | */ |
aa7c23a9 | 476 | static |
a90917c3 | 477 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 478 | { |
11b5a3c2 | 479 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 480 | module_put(chan->transport->owner); |
4e3c1b9b | 481 | list_del(&chan->list); |
8070f5c0 | 482 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
483 | kfree(chan); |
484 | } | |
485 | ||
d83004aa JD |
486 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
487 | { | |
488 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
489 | ||
490 | /* Protect the metadata cache with the sessions_mutex. */ | |
491 | mutex_lock(&sessions_mutex); | |
492 | _lttng_channel_destroy(chan); | |
493 | mutex_unlock(&sessions_mutex); | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
496 | ||
497 | static | |
498 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
499 | { | |
500 | stream->finalized = 1; | |
501 | wake_up_interruptible(&stream->read_wait); | |
502 | } | |
503 | ||
e5382b6d MD |
504 | /* |
505 | * Supports event creation while tracing session is active. | |
3c997079 | 506 | * Needs to be called with sessions mutex held. |
e5382b6d | 507 | */ |
3c997079 MD |
508 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
509 | struct lttng_kernel_event *event_param, | |
510 | void *filter, | |
511 | const struct lttng_event_desc *event_desc, | |
512 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 513 | { |
3c997079 | 514 | struct lttng_session *session = chan->session; |
a90917c3 | 515 | struct lttng_event *event; |
3c997079 MD |
516 | const char *event_name; |
517 | struct hlist_head *head; | |
518 | size_t name_len; | |
519 | uint32_t hash; | |
3d084699 | 520 | int ret; |
4e3c1b9b | 521 | |
abc0446a | 522 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 523 | ret = -EMFILE; |
e5382b6d | 524 | goto full; |
abc0446a | 525 | } |
3c997079 MD |
526 | |
527 | switch (itype) { | |
528 | case LTTNG_KERNEL_TRACEPOINT: | |
529 | event_name = event_desc->name; | |
530 | break; | |
531 | case LTTNG_KERNEL_KPROBE: | |
532 | case LTTNG_KERNEL_KRETPROBE: | |
533 | case LTTNG_KERNEL_FUNCTION: | |
534 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 535 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
536 | event_name = event_param->name; |
537 | break; | |
538 | default: | |
539 | WARN_ON_ONCE(1); | |
540 | ret = -EINVAL; | |
541 | goto type_error; | |
542 | } | |
543 | name_len = strlen(event_name); | |
544 | hash = jhash(event_name, name_len, 0); | |
545 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 546 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
547 | WARN_ON_ONCE(!event->desc); |
548 | if (!strncmp(event->desc->name, event_name, | |
549 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
550 | && chan == event->chan) { | |
551 | ret = -EEXIST; | |
552 | goto exist; | |
abc0446a MD |
553 | } |
554 | } | |
3c997079 | 555 | |
11b5a3c2 | 556 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 557 | if (!event) { |
4cf0bf51 | 558 | ret = -ENOMEM; |
4e3c1b9b | 559 | goto cache_error; |
abc0446a | 560 | } |
4e3c1b9b MD |
561 | event->chan = chan; |
562 | event->filter = filter; | |
e5382b6d | 563 | event->id = chan->free_event_id++; |
3c997079 MD |
564 | event->instrumentation = itype; |
565 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 566 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
567 | INIT_LIST_HEAD(&event->enablers_ref_head); |
568 | ||
569 | switch (itype) { | |
ab2277d6 | 570 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
571 | /* Event will be enabled by enabler sync. */ |
572 | event->enabled = 0; | |
573 | event->registered = 0; | |
574 | event->desc = lttng_event_get(event_name); | |
abc0446a | 575 | if (!event->desc) { |
4cf0bf51 | 576 | ret = -ENOENT; |
d3dbe23c | 577 | goto register_error; |
abc0446a | 578 | } |
3c997079 MD |
579 | /* Populate lttng_event structure before event registration. */ |
580 | smp_wmb(); | |
baf20995 | 581 | break; |
ab2277d6 | 582 | case LTTNG_KERNEL_KPROBE: |
4598b13b MD |
583 | /* |
584 | * Needs to be explicitly enabled after creation, since | |
585 | * we may want to apply filters. | |
586 | */ | |
587 | event->enabled = 0; | |
3c997079 MD |
588 | event->registered = 1; |
589 | /* | |
590 | * Populate lttng_event structure before event | |
591 | * registration. | |
592 | */ | |
593 | smp_wmb(); | |
594 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
595 | event_param->u.kprobe.symbol_name, |
596 | event_param->u.kprobe.offset, | |
597 | event_param->u.kprobe.addr, | |
598 | event); | |
abc0446a | 599 | if (ret) { |
4cf0bf51 | 600 | ret = -EINVAL; |
d6d808f3 | 601 | goto register_error; |
abc0446a | 602 | } |
edeb3137 MD |
603 | ret = try_module_get(event->desc->owner); |
604 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 605 | break; |
7371f44c MD |
606 | case LTTNG_KERNEL_KRETPROBE: |
607 | { | |
a90917c3 | 608 | struct lttng_event *event_return; |
7371f44c MD |
609 | |
610 | /* kretprobe defines 2 events */ | |
4598b13b MD |
611 | /* |
612 | * Needs to be explicitly enabled after creation, since | |
613 | * we may want to apply filters. | |
614 | */ | |
615 | event->enabled = 0; | |
3c997079 | 616 | event->registered = 1; |
7371f44c MD |
617 | event_return = |
618 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 619 | if (!event_return) { |
4cf0bf51 | 620 | ret = -ENOMEM; |
7371f44c | 621 | goto register_error; |
abc0446a | 622 | } |
7371f44c MD |
623 | event_return->chan = chan; |
624 | event_return->filter = filter; | |
625 | event_return->id = chan->free_event_id++; | |
4598b13b | 626 | event_return->enabled = 0; |
3c997079 MD |
627 | event_return->registered = 1; |
628 | event_return->instrumentation = itype; | |
7371f44c | 629 | /* |
a90917c3 | 630 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
631 | */ |
632 | smp_wmb(); | |
3c997079 | 633 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
634 | event_param->u.kretprobe.symbol_name, |
635 | event_param->u.kretprobe.offset, | |
636 | event_param->u.kretprobe.addr, | |
637 | event, event_return); | |
638 | if (ret) { | |
639 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 640 | ret = -EINVAL; |
7371f44c MD |
641 | goto register_error; |
642 | } | |
643 | /* Take 2 refs on the module: one per event. */ | |
644 | ret = try_module_get(event->desc->owner); | |
645 | WARN_ON_ONCE(!ret); | |
646 | ret = try_module_get(event->desc->owner); | |
647 | WARN_ON_ONCE(!ret); | |
a90917c3 | 648 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 649 | event_return); |
abc0446a | 650 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
651 | if (ret) { |
652 | kmem_cache_free(event_cache, event_return); | |
653 | module_put(event->desc->owner); | |
654 | module_put(event->desc->owner); | |
655 | goto statedump_error; | |
656 | } | |
657 | list_add(&event_return->list, &chan->session->events); | |
658 | break; | |
659 | } | |
ab2277d6 | 660 | case LTTNG_KERNEL_FUNCTION: |
4598b13b MD |
661 | /* |
662 | * Needs to be explicitly enabled after creation, since | |
663 | * we may want to apply filters. | |
664 | */ | |
665 | event->enabled = 0; | |
3c997079 MD |
666 | event->registered = 1; |
667 | /* | |
668 | * Populate lttng_event structure before event | |
669 | * registration. | |
670 | */ | |
671 | smp_wmb(); | |
672 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
673 | event_param->u.ftrace.symbol_name, |
674 | event); | |
abc0446a | 675 | if (ret) { |
e0a7a7c4 | 676 | goto register_error; |
abc0446a | 677 | } |
edeb3137 MD |
678 | ret = try_module_get(event->desc->owner); |
679 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 680 | break; |
1ec65de1 | 681 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 682 | case LTTNG_KERNEL_SYSCALL: |
4598b13b MD |
683 | /* |
684 | * Needs to be explicitly enabled after creation, since | |
685 | * we may want to apply filters. | |
686 | */ | |
687 | event->enabled = 0; | |
3c997079 MD |
688 | event->registered = 0; |
689 | event->desc = event_desc; | |
abc0446a | 690 | if (!event->desc) { |
4cf0bf51 | 691 | ret = -EINVAL; |
259b6cb3 | 692 | goto register_error; |
abc0446a | 693 | } |
1ec65de1 | 694 | break; |
baf20995 MD |
695 | default: |
696 | WARN_ON_ONCE(1); | |
4cf0bf51 | 697 | ret = -EINVAL; |
df07930b | 698 | goto register_error; |
baf20995 | 699 | } |
a90917c3 | 700 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
701 | WARN_ON_ONCE(ret > 0); |
702 | if (ret) { | |
c099397a | 703 | goto statedump_error; |
abc0446a | 704 | } |
3c997079 | 705 | hlist_add_head(&event->hlist, head); |
dda6a249 | 706 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
707 | return event; |
708 | ||
c099397a | 709 | statedump_error: |
259b6cb3 | 710 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 711 | register_error: |
11b5a3c2 | 712 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
713 | cache_error: |
714 | exist: | |
3c997079 | 715 | type_error: |
e5382b6d | 716 | full: |
4cf0bf51 | 717 | return ERR_PTR(ret); |
4e3c1b9b MD |
718 | } |
719 | ||
3c997079 MD |
720 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
721 | struct lttng_kernel_event *event_param, | |
722 | void *filter, | |
723 | const struct lttng_event_desc *event_desc, | |
724 | enum lttng_kernel_instrumentation itype) | |
725 | { | |
726 | struct lttng_event *event; | |
727 | ||
728 | mutex_lock(&sessions_mutex); | |
729 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
730 | itype); | |
731 | mutex_unlock(&sessions_mutex); | |
732 | return event; | |
733 | } | |
734 | ||
735 | /* Only used for tracepoints for now. */ | |
736 | static | |
737 | void register_event(struct lttng_event *event) | |
738 | { | |
739 | const struct lttng_event_desc *desc; | |
f127e61e | 740 | int ret = -EINVAL; |
3c997079 | 741 | |
3c997079 MD |
742 | if (event->registered) |
743 | return; | |
4ecb5ad5 | 744 | |
3c997079 | 745 | desc = event->desc; |
4ecb5ad5 MD |
746 | switch (event->instrumentation) { |
747 | case LTTNG_KERNEL_TRACEPOINT: | |
748 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
749 | desc->probe_callback, | |
750 | event); | |
751 | break; | |
752 | case LTTNG_KERNEL_SYSCALL: | |
753 | ret = lttng_syscall_filter_enable(event->chan, | |
754 | desc->name); | |
755 | break; | |
756 | case LTTNG_KERNEL_KPROBE: | |
757 | case LTTNG_KERNEL_KRETPROBE: | |
758 | case LTTNG_KERNEL_FUNCTION: | |
759 | case LTTNG_KERNEL_NOOP: | |
760 | ret = 0; | |
761 | break; | |
762 | default: | |
763 | WARN_ON_ONCE(1); | |
764 | } | |
3c997079 MD |
765 | if (!ret) |
766 | event->registered = 1; | |
767 | } | |
768 | ||
4e3c1b9b MD |
769 | /* |
770 | * Only used internally at session destruction. | |
771 | */ | |
a90917c3 | 772 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 773 | { |
4ecb5ad5 | 774 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
775 | int ret = -EINVAL; |
776 | ||
3c997079 MD |
777 | if (!event->registered) |
778 | return 0; | |
779 | ||
4ecb5ad5 | 780 | desc = event->desc; |
38d024ae | 781 | switch (event->instrumentation) { |
ab2277d6 | 782 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 783 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 784 | event->desc->probe_callback, |
11b5a3c2 | 785 | event); |
baf20995 | 786 | break; |
ab2277d6 | 787 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 788 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
789 | ret = 0; |
790 | break; | |
7371f44c MD |
791 | case LTTNG_KERNEL_KRETPROBE: |
792 | lttng_kretprobes_unregister(event); | |
793 | ret = 0; | |
794 | break; | |
ab2277d6 | 795 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
796 | lttng_ftrace_unregister(event); |
797 | ret = 0; | |
798 | break; | |
33a39a3c | 799 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
800 | ret = lttng_syscall_filter_disable(event->chan, |
801 | desc->name); | |
802 | break; | |
803 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
804 | ret = 0; |
805 | break; | |
baf20995 MD |
806 | default: |
807 | WARN_ON_ONCE(1); | |
808 | } | |
3c997079 MD |
809 | if (!ret) |
810 | event->registered = 0; | |
dda6a249 MD |
811 | return ret; |
812 | } | |
813 | ||
814 | /* | |
815 | * Only used internally at session destruction. | |
816 | */ | |
be066e6c | 817 | static |
a90917c3 | 818 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 819 | { |
edeb3137 MD |
820 | switch (event->instrumentation) { |
821 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 822 | lttng_event_put(event->desc); |
edeb3137 MD |
823 | break; |
824 | case LTTNG_KERNEL_KPROBE: | |
825 | module_put(event->desc->owner); | |
826 | lttng_kprobes_destroy_private(event); | |
827 | break; | |
7371f44c MD |
828 | case LTTNG_KERNEL_KRETPROBE: |
829 | module_put(event->desc->owner); | |
830 | lttng_kretprobes_destroy_private(event); | |
831 | break; | |
edeb3137 MD |
832 | case LTTNG_KERNEL_FUNCTION: |
833 | module_put(event->desc->owner); | |
834 | lttng_ftrace_destroy_private(event); | |
835 | break; | |
259b6cb3 | 836 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 837 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 838 | break; |
edeb3137 MD |
839 | default: |
840 | WARN_ON_ONCE(1); | |
841 | } | |
dda6a249 | 842 | list_del(&event->list); |
8070f5c0 | 843 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 844 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
845 | } |
846 | ||
e0130fab MD |
847 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
848 | { | |
849 | int ret; | |
850 | ||
851 | if (pid < -1) | |
852 | return -EINVAL; | |
853 | mutex_lock(&sessions_mutex); | |
854 | if (pid == -1) { | |
855 | /* track all pids: destroy tracker. */ | |
856 | if (session->pid_tracker) { | |
857 | struct lttng_pid_tracker *lpf; | |
858 | ||
859 | lpf = session->pid_tracker; | |
860 | rcu_assign_pointer(session->pid_tracker, NULL); | |
861 | synchronize_trace(); | |
862 | lttng_pid_tracker_destroy(lpf); | |
863 | } | |
864 | ret = 0; | |
865 | } else { | |
866 | if (!session->pid_tracker) { | |
867 | struct lttng_pid_tracker *lpf; | |
868 | ||
869 | lpf = lttng_pid_tracker_create(); | |
870 | if (!lpf) { | |
871 | ret = -ENOMEM; | |
872 | goto unlock; | |
873 | } | |
874 | ret = lttng_pid_tracker_add(lpf, pid); | |
875 | rcu_assign_pointer(session->pid_tracker, lpf); | |
876 | } else { | |
877 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
878 | } | |
879 | } | |
880 | unlock: | |
881 | mutex_unlock(&sessions_mutex); | |
882 | return ret; | |
883 | } | |
884 | ||
885 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
886 | { | |
887 | int ret; | |
888 | ||
889 | if (pid < -1) | |
890 | return -EINVAL; | |
891 | mutex_lock(&sessions_mutex); | |
892 | if (pid == -1) { | |
893 | /* untrack all pids: replace by empty tracker. */ | |
894 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
895 | struct lttng_pid_tracker *lpf; | |
896 | ||
897 | lpf = lttng_pid_tracker_create(); | |
898 | if (!lpf) { | |
899 | ret = -ENOMEM; | |
900 | goto unlock; | |
901 | } | |
902 | rcu_assign_pointer(session->pid_tracker, lpf); | |
903 | synchronize_trace(); | |
904 | if (old_lpf) | |
905 | lttng_pid_tracker_destroy(old_lpf); | |
906 | ret = 0; | |
907 | } else { | |
908 | if (!session->pid_tracker) { | |
909 | ret = -ENOENT; | |
910 | goto unlock; | |
911 | } | |
912 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
913 | } | |
914 | unlock: | |
915 | mutex_unlock(&sessions_mutex); | |
916 | return ret; | |
917 | } | |
918 | ||
7e6f9ef6 MD |
919 | static |
920 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
921 | { | |
922 | struct lttng_session *session = m->private; | |
923 | struct lttng_pid_tracker *lpf; | |
924 | struct lttng_pid_hash_node *e; | |
925 | int iter = 0, i; | |
926 | ||
927 | mutex_lock(&sessions_mutex); | |
928 | lpf = session->pid_tracker; | |
929 | if (lpf) { | |
930 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
931 | struct hlist_head *head = &lpf->pid_hash[i]; | |
932 | ||
f934e302 | 933 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
934 | if (iter++ >= *pos) |
935 | return e; | |
936 | } | |
937 | } | |
938 | } else { | |
939 | /* PID tracker disabled. */ | |
940 | if (iter >= *pos && iter == 0) { | |
941 | return session; /* empty tracker */ | |
942 | } | |
943 | iter++; | |
944 | } | |
945 | /* End of list */ | |
946 | return NULL; | |
947 | } | |
948 | ||
949 | /* Called with sessions_mutex held. */ | |
950 | static | |
951 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
952 | { | |
953 | struct lttng_session *session = m->private; | |
954 | struct lttng_pid_tracker *lpf; | |
955 | struct lttng_pid_hash_node *e; | |
956 | int iter = 0, i; | |
957 | ||
958 | (*ppos)++; | |
959 | lpf = session->pid_tracker; | |
960 | if (lpf) { | |
961 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
962 | struct hlist_head *head = &lpf->pid_hash[i]; | |
963 | ||
f934e302 | 964 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
965 | if (iter++ >= *ppos) |
966 | return e; | |
967 | } | |
968 | } | |
969 | } else { | |
970 | /* PID tracker disabled. */ | |
971 | if (iter >= *ppos && iter == 0) | |
972 | return session; /* empty tracker */ | |
973 | iter++; | |
974 | } | |
975 | ||
976 | /* End of list */ | |
977 | return NULL; | |
978 | } | |
979 | ||
980 | static | |
981 | void pid_list_stop(struct seq_file *m, void *p) | |
982 | { | |
983 | mutex_unlock(&sessions_mutex); | |
984 | } | |
985 | ||
986 | static | |
987 | int pid_list_show(struct seq_file *m, void *p) | |
988 | { | |
989 | int pid; | |
990 | ||
991 | if (p == m->private) { | |
992 | /* Tracker disabled. */ | |
993 | pid = -1; | |
994 | } else { | |
995 | const struct lttng_pid_hash_node *e = p; | |
996 | ||
997 | pid = lttng_pid_tracker_get_node_pid(e); | |
998 | } | |
999 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static | |
1004 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1005 | .start = pid_list_start, | |
1006 | .next = pid_list_next, | |
1007 | .stop = pid_list_stop, | |
1008 | .show = pid_list_show, | |
1009 | }; | |
1010 | ||
1011 | static | |
1012 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1013 | { | |
1014 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1015 | } | |
1016 | ||
1017 | static | |
1018 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1019 | { | |
1020 | struct seq_file *m = file->private_data; | |
1021 | struct lttng_session *session = m->private; | |
1022 | int ret; | |
1023 | ||
1024 | WARN_ON_ONCE(!session); | |
1025 | ret = seq_release(inode, file); | |
1026 | if (!ret && session) | |
1027 | fput(session->file); | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1032 | .owner = THIS_MODULE, | |
1033 | .open = lttng_tracker_pids_list_open, | |
1034 | .read = seq_read, | |
1035 | .llseek = seq_lseek, | |
1036 | .release = lttng_tracker_pids_list_release, | |
1037 | }; | |
1038 | ||
1039 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1040 | { | |
1041 | struct file *tracker_pids_list_file; | |
1042 | struct seq_file *m; | |
1043 | int file_fd, ret; | |
1044 | ||
1045 | file_fd = lttng_get_unused_fd(); | |
1046 | if (file_fd < 0) { | |
1047 | ret = file_fd; | |
1048 | goto fd_error; | |
1049 | } | |
1050 | ||
1051 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1052 | <tng_tracker_pids_list_fops, | |
1053 | NULL, O_RDWR); | |
1054 | if (IS_ERR(tracker_pids_list_file)) { | |
1055 | ret = PTR_ERR(tracker_pids_list_file); | |
1056 | goto file_error; | |
1057 | } | |
4ce9f32b MD |
1058 | if (atomic_long_add_unless(&session->file->f_count, |
1059 | 1, INT_MAX) == INT_MAX) { | |
1060 | goto refcount_error; | |
1061 | } | |
7e6f9ef6 MD |
1062 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1063 | if (ret < 0) | |
1064 | goto open_error; | |
1065 | m = tracker_pids_list_file->private_data; | |
1066 | m->private = session; | |
1067 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1068 | |
1069 | return file_fd; | |
1070 | ||
1071 | open_error: | |
4ce9f32b MD |
1072 | atomic_long_dec(&session->file->f_count); |
1073 | refcount_error: | |
7e6f9ef6 MD |
1074 | fput(tracker_pids_list_file); |
1075 | file_error: | |
1076 | put_unused_fd(file_fd); | |
1077 | fd_error: | |
1078 | return ret; | |
1079 | } | |
1080 | ||
3c997079 MD |
1081 | /* |
1082 | * Enabler management. | |
1083 | */ | |
1084 | static | |
4ecb5ad5 MD |
1085 | int lttng_match_enabler_wildcard(const char *desc_name, |
1086 | const char *name) | |
3c997079 | 1087 | { |
3c997079 | 1088 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1089 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1090 | return 0; |
1091 | return 1; | |
1092 | } | |
1093 | ||
1094 | static | |
4ecb5ad5 MD |
1095 | int lttng_match_enabler_name(const char *desc_name, |
1096 | const char *name) | |
3c997079 | 1097 | { |
4ecb5ad5 | 1098 | if (strcmp(desc_name, name)) |
3c997079 MD |
1099 | return 0; |
1100 | return 1; | |
1101 | } | |
1102 | ||
1103 | static | |
1104 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1105 | struct lttng_enabler *enabler) | |
1106 | { | |
4ecb5ad5 MD |
1107 | const char *desc_name, *enabler_name; |
1108 | ||
1109 | enabler_name = enabler->event_param.name; | |
1110 | switch (enabler->event_param.instrumentation) { | |
1111 | case LTTNG_KERNEL_TRACEPOINT: | |
1112 | desc_name = desc->name; | |
1113 | break; | |
1114 | case LTTNG_KERNEL_SYSCALL: | |
1115 | desc_name = desc->name; | |
1116 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1117 | desc_name += strlen("compat_"); | |
1118 | if (!strncmp(desc_name, "syscall_exit_", | |
1119 | strlen("syscall_exit_"))) { | |
1120 | desc_name += strlen("syscall_exit_"); | |
1121 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1122 | strlen("syscall_entry_"))) { | |
1123 | desc_name += strlen("syscall_entry_"); | |
1124 | } else { | |
1125 | WARN_ON_ONCE(1); | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | break; | |
1129 | default: | |
1130 | WARN_ON_ONCE(1); | |
1131 | return -EINVAL; | |
1132 | } | |
3c997079 MD |
1133 | switch (enabler->type) { |
1134 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1135 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1136 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1137 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1138 | default: |
1139 | return -EINVAL; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | static | |
1144 | int lttng_event_match_enabler(struct lttng_event *event, | |
1145 | struct lttng_enabler *enabler) | |
1146 | { | |
33a39a3c MD |
1147 | if (enabler->event_param.instrumentation != event->instrumentation) |
1148 | return 0; | |
3c997079 MD |
1149 | if (lttng_desc_match_enabler(event->desc, enabler) |
1150 | && event->chan == enabler->chan) | |
1151 | return 1; | |
1152 | else | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static | |
1157 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1158 | struct lttng_enabler *enabler) | |
1159 | { | |
1160 | struct lttng_enabler_ref *enabler_ref; | |
1161 | ||
1162 | list_for_each_entry(enabler_ref, | |
1163 | &event->enablers_ref_head, node) { | |
1164 | if (enabler_ref->ref == enabler) | |
1165 | return enabler_ref; | |
1166 | } | |
1167 | return NULL; | |
1168 | } | |
1169 | ||
3c997079 | 1170 | static |
33a39a3c | 1171 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1172 | { |
1173 | struct lttng_session *session = enabler->chan->session; | |
1174 | struct lttng_probe_desc *probe_desc; | |
1175 | const struct lttng_event_desc *desc; | |
1176 | int i; | |
1177 | struct list_head *probe_list; | |
1178 | ||
1179 | probe_list = lttng_get_probe_list_head(); | |
1180 | /* | |
1181 | * For each probe event, if we find that a probe event matches | |
1182 | * our enabler, create an associated lttng_event if not | |
1183 | * already present. | |
1184 | */ | |
1185 | list_for_each_entry(probe_desc, probe_list, head) { | |
1186 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1187 | int found = 0; | |
1188 | struct hlist_head *head; | |
1189 | const char *event_name; | |
1190 | size_t name_len; | |
1191 | uint32_t hash; | |
1192 | struct lttng_event *event; | |
1193 | ||
1194 | desc = probe_desc->event_desc[i]; | |
1195 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1196 | continue; | |
1197 | event_name = desc->name; | |
1198 | name_len = strlen(event_name); | |
1199 | ||
1200 | /* | |
1201 | * Check if already created. | |
1202 | */ | |
1203 | hash = jhash(event_name, name_len, 0); | |
1204 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1205 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1206 | if (event->desc == desc |
1207 | && event->chan == enabler->chan) | |
1208 | found = 1; | |
1209 | } | |
1210 | if (found) | |
1211 | continue; | |
1212 | ||
1213 | /* | |
1214 | * We need to create an event for this | |
1215 | * event probe. | |
1216 | */ | |
1217 | event = _lttng_event_create(enabler->chan, | |
1218 | NULL, NULL, desc, | |
1219 | LTTNG_KERNEL_TRACEPOINT); | |
1220 | if (!event) { | |
1221 | printk(KERN_INFO "Unable to create event %s\n", | |
1222 | probe_desc->event_desc[i]->name); | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | } | |
1227 | ||
33a39a3c MD |
1228 | static |
1229 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1230 | { | |
1231 | int ret; | |
1232 | ||
1233 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1234 | WARN_ON_ONCE(ret); | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * Create struct lttng_event if it is missing and present in the list of | |
1239 | * tracepoint probes. | |
1240 | * Should be called with sessions mutex held. | |
1241 | */ | |
1242 | static | |
1243 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1244 | { | |
1245 | switch (enabler->event_param.instrumentation) { | |
1246 | case LTTNG_KERNEL_TRACEPOINT: | |
1247 | lttng_create_tracepoint_if_missing(enabler); | |
1248 | break; | |
1249 | case LTTNG_KERNEL_SYSCALL: | |
1250 | lttng_create_syscall_if_missing(enabler); | |
1251 | break; | |
1252 | default: | |
1253 | WARN_ON_ONCE(1); | |
1254 | break; | |
1255 | } | |
1256 | } | |
1257 | ||
3c997079 MD |
1258 | /* |
1259 | * Create events associated with an enabler (if not already present), | |
1260 | * and add backward reference from the event to the enabler. | |
1261 | * Should be called with sessions mutex held. | |
1262 | */ | |
1263 | static | |
1264 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1265 | { | |
1266 | struct lttng_session *session = enabler->chan->session; | |
1267 | struct lttng_event *event; | |
1268 | ||
1269 | /* First ensure that probe events are created for this enabler. */ | |
1270 | lttng_create_event_if_missing(enabler); | |
1271 | ||
1272 | /* For each event matching enabler in session event list. */ | |
1273 | list_for_each_entry(event, &session->events, list) { | |
1274 | struct lttng_enabler_ref *enabler_ref; | |
1275 | ||
1276 | if (!lttng_event_match_enabler(event, enabler)) | |
1277 | continue; | |
1278 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1279 | if (!enabler_ref) { | |
1280 | /* | |
1281 | * If no backward ref, create it. | |
1282 | * Add backward ref from event to enabler. | |
1283 | */ | |
1284 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1285 | if (!enabler_ref) | |
1286 | return -ENOMEM; | |
1287 | enabler_ref->ref = enabler; | |
1288 | list_add(&enabler_ref->node, | |
1289 | &event->enablers_ref_head); | |
1290 | } | |
1291 | ||
f127e61e MD |
1292 | /* |
1293 | * Link filter bytecodes if not linked yet. | |
1294 | */ | |
1295 | lttng_enabler_event_link_bytecode(event, enabler); | |
1296 | ||
3c997079 MD |
1297 | /* TODO: merge event context. */ |
1298 | } | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Called at module load: connect the probe on all enablers matching | |
1304 | * this event. | |
1305 | * Called with sessions lock held. | |
1306 | */ | |
1307 | int lttng_fix_pending_events(void) | |
1308 | { | |
1309 | struct lttng_session *session; | |
1310 | ||
1311 | list_for_each_entry(session, &sessions, list) | |
1312 | lttng_session_lazy_sync_enablers(session); | |
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1317 | struct lttng_kernel_event *event_param, | |
1318 | struct lttng_channel *chan) | |
1319 | { | |
1320 | struct lttng_enabler *enabler; | |
1321 | ||
1322 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1323 | if (!enabler) | |
1324 | return NULL; | |
1325 | enabler->type = type; | |
07dfc1d0 | 1326 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1327 | memcpy(&enabler->event_param, event_param, |
1328 | sizeof(enabler->event_param)); | |
1329 | enabler->chan = chan; | |
1330 | /* ctx left NULL */ | |
4fd19d8a | 1331 | enabler->enabled = 0; |
3c997079 MD |
1332 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1333 | mutex_lock(&sessions_mutex); | |
1334 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1335 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1336 | mutex_unlock(&sessions_mutex); | |
1337 | return enabler; | |
1338 | } | |
1339 | ||
1340 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1341 | { | |
1342 | mutex_lock(&sessions_mutex); | |
1343 | enabler->enabled = 1; | |
1344 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1345 | mutex_unlock(&sessions_mutex); | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1350 | { | |
1351 | mutex_lock(&sessions_mutex); | |
1352 | enabler->enabled = 0; | |
1353 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1354 | mutex_unlock(&sessions_mutex); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
07dfc1d0 MD |
1358 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1359 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1360 | { | |
1361 | struct lttng_filter_bytecode_node *bytecode_node; | |
1362 | uint32_t bytecode_len; | |
1363 | int ret; | |
1364 | ||
1365 | ret = get_user(bytecode_len, &bytecode->len); | |
1366 | if (ret) | |
1367 | return ret; | |
1368 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1369 | GFP_KERNEL); | |
1370 | if (!bytecode_node) | |
1371 | return -ENOMEM; | |
1372 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1373 | sizeof(*bytecode) + bytecode_len); | |
1374 | if (ret) | |
1375 | goto error_free; | |
1376 | bytecode_node->enabler = enabler; | |
1377 | /* Enforce length based on allocated size */ | |
1378 | bytecode_node->bc.len = bytecode_len; | |
1379 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1380 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1381 | return 0; | |
1382 | ||
1383 | error_free: | |
1384 | kfree(bytecode_node); | |
1385 | return ret; | |
1386 | } | |
1387 | ||
3c997079 MD |
1388 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1389 | struct lttng_kernel_context *context_param) | |
1390 | { | |
1391 | return -ENOSYS; | |
1392 | } | |
1393 | ||
1394 | static | |
1395 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1396 | { | |
07dfc1d0 MD |
1397 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1398 | ||
1399 | /* Destroy filter bytecode */ | |
1400 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1401 | &enabler->filter_bytecode_head, node) { | |
1402 | kfree(filter_node); | |
1403 | } | |
1404 | ||
3c997079 MD |
1405 | /* Destroy contexts */ |
1406 | lttng_destroy_context(enabler->ctx); | |
1407 | ||
1408 | list_del(&enabler->node); | |
1409 | kfree(enabler); | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * lttng_session_sync_enablers should be called just before starting a | |
1414 | * session. | |
1415 | * Should be called with sessions mutex held. | |
1416 | */ | |
1417 | static | |
1418 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1419 | { | |
1420 | struct lttng_enabler *enabler; | |
1421 | struct lttng_event *event; | |
1422 | ||
1423 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1424 | lttng_enabler_ref_events(enabler); | |
1425 | /* | |
1426 | * For each event, if at least one of its enablers is enabled, | |
1427 | * and its channel and session transient states are enabled, we | |
1428 | * enable the event, else we disable it. | |
1429 | */ | |
1430 | list_for_each_entry(event, &session->events, list) { | |
1431 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1432 | struct lttng_bytecode_runtime *runtime; |
1433 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1434 | |
4ecb5ad5 MD |
1435 | switch (event->instrumentation) { |
1436 | case LTTNG_KERNEL_TRACEPOINT: | |
1437 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1438 | /* Enable events */ |
1439 | list_for_each_entry(enabler_ref, | |
1440 | &event->enablers_ref_head, node) { | |
1441 | if (enabler_ref->ref->enabled) { | |
1442 | enabled = 1; | |
1443 | break; | |
1444 | } | |
1445 | } | |
4ecb5ad5 MD |
1446 | break; |
1447 | default: | |
3c997079 MD |
1448 | /* Not handled with lazy sync. */ |
1449 | continue; | |
1450 | } | |
1451 | /* | |
1452 | * Enabled state is based on union of enablers, with | |
1453 | * intesection of session and channel transient enable | |
1454 | * states. | |
1455 | */ | |
1456 | enabled = enabled && session->tstate && event->chan->tstate; | |
1457 | ||
1458 | ACCESS_ONCE(event->enabled) = enabled; | |
1459 | /* | |
1460 | * Sync tracepoint registration with event enabled | |
1461 | * state. | |
1462 | */ | |
1463 | if (enabled) { | |
1464 | register_event(event); | |
1465 | } else { | |
1466 | _lttng_event_unregister(event); | |
1467 | } | |
07dfc1d0 MD |
1468 | |
1469 | /* Check if has enablers without bytecode enabled */ | |
1470 | list_for_each_entry(enabler_ref, | |
1471 | &event->enablers_ref_head, node) { | |
1472 | if (enabler_ref->ref->enabled | |
1473 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1474 | has_enablers_without_bytecode = 1; | |
1475 | break; | |
1476 | } | |
1477 | } | |
1478 | event->has_enablers_without_bytecode = | |
1479 | has_enablers_without_bytecode; | |
1480 | ||
1481 | /* Enable filters */ | |
1482 | list_for_each_entry(runtime, | |
f127e61e | 1483 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1484 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1485 | } |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Apply enablers to session events, adding events to session if need | |
1490 | * be. It is required after each modification applied to an active | |
1491 | * session, and right before session "start". | |
1492 | * "lazy" sync means we only sync if required. | |
1493 | * Should be called with sessions mutex held. | |
1494 | */ | |
1495 | static | |
1496 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1497 | { | |
1498 | /* We can skip if session is not active */ | |
1499 | if (!session->active) | |
1500 | return; | |
1501 | lttng_session_sync_enablers(session); | |
1502 | } | |
1503 | ||
1ec3f75a | 1504 | /* |
d83004aa JD |
1505 | * Serialize at most one packet worth of metadata into a metadata |
1506 | * channel. | |
92d9f5e6 MD |
1507 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1508 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1509 | * allows us to do racy operations such as looking for remaining space left in | |
1510 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1511 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1512 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1513 | * Returns the number of bytes written in the channel, 0 if no data |
1514 | * was written and a negative value on error. | |
1ec3f75a | 1515 | */ |
b3b8072b MD |
1516 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1517 | struct channel *chan) | |
d83004aa JD |
1518 | { |
1519 | struct lib_ring_buffer_ctx ctx; | |
1520 | int ret = 0; | |
1521 | size_t len, reserve_len; | |
1522 | ||
f613e3e6 | 1523 | /* |
92d9f5e6 MD |
1524 | * Ensure we support mutiple get_next / put sequences followed by |
1525 | * put_next. The metadata cache lock protects reading the metadata | |
1526 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1527 | * "flush" operations on the buffer invoked by different processes. | |
1528 | * Moreover, since the metadata cache memory can be reallocated, we | |
1529 | * need to have exclusive access against updates even though we only | |
1530 | * read it. | |
f613e3e6 | 1531 | */ |
92d9f5e6 | 1532 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1533 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1534 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1535 | goto end; |
f613e3e6 | 1536 | |
d83004aa | 1537 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1538 | stream->metadata_in; |
9de2c215 | 1539 | if (!len) |
de23d59d | 1540 | goto end; |
d83004aa | 1541 | reserve_len = min_t(size_t, |
b3b8072b | 1542 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1543 | len); |
b3b8072b | 1544 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1545 | sizeof(char), -1); |
1546 | /* | |
1547 | * If reservation failed, return an error to the caller. | |
1548 | */ | |
b3b8072b | 1549 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1550 | if (ret != 0) { |
1551 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1552 | goto end; | |
1553 | } | |
b3b8072b | 1554 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1555 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1556 | reserve_len); |
b3b8072b | 1557 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1558 | stream->metadata_in += reserve_len; |
d83004aa JD |
1559 | ret = reserve_len; |
1560 | ||
1561 | end: | |
92d9f5e6 | 1562 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1563 | return ret; |
1564 | } | |
1565 | ||
1566 | /* | |
1567 | * Write the metadata to the metadata cache. | |
1568 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1569 | * The metadata cache lock protects us from concurrent read access from |
1570 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1571 | */ |
a90917c3 | 1572 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1573 | const char *fmt, ...) |
1574 | { | |
c099397a | 1575 | char *str; |
d83004aa | 1576 | size_t len; |
c099397a | 1577 | va_list ap; |
d83004aa | 1578 | struct lttng_metadata_stream *stream; |
c099397a MD |
1579 | |
1580 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1581 | ||
1582 | va_start(ap, fmt); | |
1583 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1584 | va_end(ap); | |
1585 | if (!str) | |
1586 | return -ENOMEM; | |
1587 | ||
1ec3f75a | 1588 | len = strlen(str); |
92d9f5e6 | 1589 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1590 | if (session->metadata_cache->metadata_written + len > |
1591 | session->metadata_cache->cache_alloc) { | |
1592 | char *tmp_cache_realloc; | |
1593 | unsigned int tmp_cache_alloc_size; | |
1594 | ||
1595 | tmp_cache_alloc_size = max_t(unsigned int, | |
1596 | session->metadata_cache->cache_alloc + len, | |
1597 | session->metadata_cache->cache_alloc << 1); | |
c74b9c6f | 1598 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1599 | if (!tmp_cache_realloc) |
1600 | goto err; | |
a606b6e8 ML |
1601 | if (session->metadata_cache->data) { |
1602 | memcpy(tmp_cache_realloc, | |
1603 | session->metadata_cache->data, | |
1604 | session->metadata_cache->cache_alloc); | |
1605 | vfree(session->metadata_cache->data); | |
1606 | } | |
1607 | ||
d83004aa JD |
1608 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1609 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1610 | } |
d83004aa JD |
1611 | memcpy(session->metadata_cache->data + |
1612 | session->metadata_cache->metadata_written, | |
1613 | str, len); | |
1614 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1615 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1616 | kfree(str); |
d83004aa JD |
1617 | |
1618 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1619 | wake_up_interruptible(&stream->read_wait); | |
1620 | ||
1621 | return 0; | |
1622 | ||
1623 | err: | |
92d9f5e6 | 1624 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1625 | kfree(str); |
1626 | return -ENOMEM; | |
c099397a MD |
1627 | } |
1628 | ||
d83004aa JD |
1629 | /* |
1630 | * Must be called with sessions_mutex held. | |
1631 | */ | |
c099397a | 1632 | static |
a90917c3 | 1633 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 1634 | const struct lttng_event_field *field) |
c099397a | 1635 | { |
c099397a | 1636 | int ret = 0; |
c099397a | 1637 | |
8070f5c0 MD |
1638 | switch (field->type.atype) { |
1639 | case atype_integer: | |
1640 | ret = lttng_metadata_printf(session, | |
244465ab | 1641 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1642 | field->type.u.basic.integer.size, |
1643 | field->type.u.basic.integer.alignment, | |
1644 | field->type.u.basic.integer.signedness, | |
1645 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1646 | ? "none" | |
1647 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1648 | ? "UTF8" | |
1649 | : "ASCII", | |
1650 | field->type.u.basic.integer.base, | |
9928f844 | 1651 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1652 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1653 | #else |
8070f5c0 | 1654 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1655 | #endif |
8070f5c0 MD |
1656 | field->name); |
1657 | break; | |
1658 | case atype_enum: | |
1659 | ret = lttng_metadata_printf(session, | |
244465ab | 1660 | " %s _%s;\n", |
8070f5c0 MD |
1661 | field->type.u.basic.enumeration.name, |
1662 | field->name); | |
1663 | break; | |
1664 | case atype_array: | |
1665 | { | |
1666 | const struct lttng_basic_type *elem_type; | |
1667 | ||
1668 | elem_type = &field->type.u.array.elem_type; | |
1669 | ret = lttng_metadata_printf(session, | |
244465ab | 1670 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1671 | elem_type->u.basic.integer.size, |
1672 | elem_type->u.basic.integer.alignment, | |
1673 | elem_type->u.basic.integer.signedness, | |
1674 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1675 | ? "none" | |
1676 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1677 | ? "UTF8" | |
1678 | : "ASCII", | |
1679 | elem_type->u.basic.integer.base, | |
9928f844 | 1680 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1681 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1682 | #else |
8070f5c0 | 1683 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1684 | #endif |
8070f5c0 MD |
1685 | field->name, field->type.u.array.length); |
1686 | break; | |
1687 | } | |
1688 | case atype_sequence: | |
1689 | { | |
1690 | const struct lttng_basic_type *elem_type; | |
1691 | const struct lttng_basic_type *length_type; | |
1692 | ||
1693 | elem_type = &field->type.u.sequence.elem_type; | |
1694 | length_type = &field->type.u.sequence.length_type; | |
1695 | ret = lttng_metadata_printf(session, | |
1696 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1697 | length_type->u.basic.integer.size, |
32257272 | 1698 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1699 | length_type->u.basic.integer.signedness, |
1700 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1701 | ? "none" | |
0635cdd4 | 1702 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1703 | ? "UTF8" |
0635cdd4 | 1704 | : "ASCII"), |
8070f5c0 | 1705 | length_type->u.basic.integer.base, |
9928f844 | 1706 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1707 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1708 | #else |
0635cdd4 | 1709 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1710 | #endif |
27d2368e MD |
1711 | field->name); |
1712 | if (ret) | |
1713 | return ret; | |
1714 | ||
1715 | ret = lttng_metadata_printf(session, | |
244465ab | 1716 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1717 | elem_type->u.basic.integer.size, |
32257272 | 1718 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1719 | elem_type->u.basic.integer.signedness, |
1720 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1721 | ? "none" | |
0635cdd4 | 1722 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1723 | ? "UTF8" |
0635cdd4 | 1724 | : "ASCII"), |
8070f5c0 | 1725 | elem_type->u.basic.integer.base, |
9928f844 | 1726 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1727 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1728 | #else |
8070f5c0 | 1729 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1730 | #endif |
8070f5c0 | 1731 | field->name, |
27d2368e | 1732 | field->name); |
8070f5c0 MD |
1733 | break; |
1734 | } | |
c099397a | 1735 | |
8070f5c0 MD |
1736 | case atype_string: |
1737 | /* Default encoding is UTF8 */ | |
1738 | ret = lttng_metadata_printf(session, | |
244465ab | 1739 | " string%s _%s;\n", |
8070f5c0 MD |
1740 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1741 | " { encoding = ASCII; }" : "", | |
1742 | field->name); | |
1743 | break; | |
1744 | default: | |
1745 | WARN_ON_ONCE(1); | |
1746 | return -EINVAL; | |
1747 | } | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | static | |
a90917c3 | 1752 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1753 | struct lttng_ctx *ctx) |
1754 | { | |
1755 | int ret = 0; | |
1756 | int i; | |
1757 | ||
1758 | if (!ctx) | |
1759 | return 0; | |
1760 | for (i = 0; i < ctx->nr_fields; i++) { | |
1761 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1762 | ||
a90917c3 | 1763 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1764 | if (ret) |
1765 | return ret; | |
1766 | } | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | static | |
a90917c3 MD |
1771 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1772 | struct lttng_event *event) | |
8070f5c0 MD |
1773 | { |
1774 | const struct lttng_event_desc *desc = event->desc; | |
1775 | int ret = 0; | |
1776 | int i; | |
1777 | ||
1778 | for (i = 0; i < desc->nr_fields; i++) { | |
1779 | const struct lttng_event_field *field = &desc->fields[i]; | |
1780 | ||
a90917c3 | 1781 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1782 | if (ret) |
1783 | return ret; | |
c099397a MD |
1784 | } |
1785 | return ret; | |
1786 | } | |
1787 | ||
d83004aa JD |
1788 | /* |
1789 | * Must be called with sessions_mutex held. | |
1790 | */ | |
c099397a | 1791 | static |
a90917c3 MD |
1792 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1793 | struct lttng_channel *chan, | |
1794 | struct lttng_event *event) | |
c099397a MD |
1795 | { |
1796 | int ret = 0; | |
1797 | ||
1798 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1799 | return 0; | |
d83004aa | 1800 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1801 | return 0; |
1802 | ||
1803 | ret = lttng_metadata_printf(session, | |
1804 | "event {\n" | |
ae734547 | 1805 | " name = \"%s\";\n" |
c099397a | 1806 | " id = %u;\n" |
b9074a1b | 1807 | " stream_id = %u;\n", |
c099397a MD |
1808 | event->desc->name, |
1809 | event->id, | |
1810 | event->chan->id); | |
1811 | if (ret) | |
1812 | goto end; | |
1813 | ||
b9074a1b MD |
1814 | if (event->ctx) { |
1815 | ret = lttng_metadata_printf(session, | |
1816 | " context := struct {\n"); | |
1817 | if (ret) | |
1818 | goto end; | |
1819 | } | |
a90917c3 | 1820 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1821 | if (ret) |
1822 | goto end; | |
b9074a1b MD |
1823 | if (event->ctx) { |
1824 | ret = lttng_metadata_printf(session, | |
1825 | " };\n"); | |
1826 | if (ret) | |
1827 | goto end; | |
1828 | } | |
8070f5c0 MD |
1829 | |
1830 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1831 | " fields := struct {\n" |
1832 | ); | |
1833 | if (ret) | |
1834 | goto end; | |
1835 | ||
a90917c3 | 1836 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1837 | if (ret) |
1838 | goto end; | |
1839 | ||
1840 | /* | |
1841 | * LTTng space reservation can only reserve multiples of the | |
1842 | * byte size. | |
1843 | */ | |
1844 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1845 | " };\n" |
1846 | "};\n\n"); | |
c099397a MD |
1847 | if (ret) |
1848 | goto end; | |
1849 | ||
c099397a MD |
1850 | event->metadata_dumped = 1; |
1851 | end: | |
1852 | return ret; | |
1853 | ||
1854 | } | |
1855 | ||
d83004aa JD |
1856 | /* |
1857 | * Must be called with sessions_mutex held. | |
1858 | */ | |
c099397a | 1859 | static |
a90917c3 MD |
1860 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1861 | struct lttng_channel *chan) | |
c099397a MD |
1862 | { |
1863 | int ret = 0; | |
1864 | ||
1865 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1866 | return 0; | |
d83004aa JD |
1867 | |
1868 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1869 | return 0; |
1870 | ||
1871 | WARN_ON_ONCE(!chan->header_type); | |
1872 | ret = lttng_metadata_printf(session, | |
1873 | "stream {\n" | |
1874 | " id = %u;\n" | |
9115fbdc | 1875 | " event.header := %s;\n" |
b9074a1b | 1876 | " packet.context := struct packet_context;\n", |
c099397a MD |
1877 | chan->id, |
1878 | chan->header_type == 1 ? "struct event_header_compact" : | |
1879 | "struct event_header_large"); | |
1880 | if (ret) | |
1881 | goto end; | |
1882 | ||
b9074a1b MD |
1883 | if (chan->ctx) { |
1884 | ret = lttng_metadata_printf(session, | |
1885 | " event.context := struct {\n"); | |
1886 | if (ret) | |
1887 | goto end; | |
1888 | } | |
a90917c3 | 1889 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1890 | if (ret) |
1891 | goto end; | |
b9074a1b MD |
1892 | if (chan->ctx) { |
1893 | ret = lttng_metadata_printf(session, | |
1894 | " };\n"); | |
1895 | if (ret) | |
1896 | goto end; | |
1897 | } | |
8070f5c0 MD |
1898 | |
1899 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1900 | "};\n\n"); |
8070f5c0 | 1901 | |
c099397a MD |
1902 | chan->metadata_dumped = 1; |
1903 | end: | |
1904 | return ret; | |
1905 | } | |
1906 | ||
d83004aa JD |
1907 | /* |
1908 | * Must be called with sessions_mutex held. | |
1909 | */ | |
9115fbdc | 1910 | static |
a90917c3 | 1911 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1912 | { |
1913 | return lttng_metadata_printf(session, | |
1914 | "struct packet_context {\n" | |
a3ccff4f MD |
1915 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1916 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1917 | " uint64_t content_size;\n" |
1918 | " uint64_t packet_size;\n" | |
a9afe705 | 1919 | " unsigned long events_discarded;\n" |
9115fbdc | 1920 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1921 | "};\n\n" |
9115fbdc MD |
1922 | ); |
1923 | } | |
1924 | ||
1925 | /* | |
1926 | * Compact header: | |
1927 | * id: range: 0 - 30. | |
1928 | * id 31 is reserved to indicate an extended header. | |
1929 | * | |
1930 | * Large header: | |
1931 | * id: range: 0 - 65534. | |
1932 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1933 | * |
1934 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1935 | */ |
1936 | static | |
a90917c3 | 1937 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1938 | { |
1939 | return lttng_metadata_printf(session, | |
1940 | "struct event_header_compact {\n" | |
1941 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1942 | " variant <id> {\n" | |
1943 | " struct {\n" | |
a3ccff4f | 1944 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1945 | " } compact;\n" |
1946 | " struct {\n" | |
1947 | " uint32_t id;\n" | |
a3ccff4f | 1948 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1949 | " } extended;\n" |
1950 | " } v;\n" | |
1951 | "} align(%u);\n" | |
1952 | "\n" | |
1953 | "struct event_header_large {\n" | |
1954 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1955 | " variant <id> {\n" | |
1956 | " struct {\n" | |
a3ccff4f | 1957 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1958 | " } compact;\n" |
1959 | " struct {\n" | |
1960 | " uint32_t id;\n" | |
a3ccff4f | 1961 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1962 | " } extended;\n" |
1963 | " } v;\n" | |
1964 | "} align(%u);\n\n", | |
a90917c3 MD |
1965 | lttng_alignof(uint32_t) * CHAR_BIT, |
1966 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1967 | ); |
1968 | } | |
1969 | ||
a3ccff4f MD |
1970 | /* |
1971 | * Approximation of NTP time of day to clock monotonic correlation, | |
1972 | * taken at start of trace. | |
1973 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1974 | * in future versions. | |
2b644192 MD |
1975 | * Return 0 if offset is negative. It may happen if the system sets |
1976 | * the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
1977 | */ |
1978 | static | |
1979 | uint64_t measure_clock_offset(void) | |
1980 | { | |
2b644192 MD |
1981 | uint64_t monotonic_avg, monotonic[2], realtime; |
1982 | int64_t offset; | |
a3ccff4f MD |
1983 | struct timespec rts = { 0, 0 }; |
1984 | unsigned long flags; | |
1985 | ||
1986 | /* Disable interrupts to increase correlation precision. */ | |
1987 | local_irq_save(flags); | |
1988 | monotonic[0] = trace_clock_read64(); | |
1989 | getnstimeofday(&rts); | |
1990 | monotonic[1] = trace_clock_read64(); | |
1991 | local_irq_restore(flags); | |
1992 | ||
2b644192 | 1993 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
57be518d | 1994 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f | 1995 | realtime += rts.tv_nsec; |
2b644192 MD |
1996 | offset = (int64_t) realtime - monotonic_avg; |
1997 | if (offset < 0) | |
1998 | return 0; | |
a3ccff4f MD |
1999 | return offset; |
2000 | } | |
2001 | ||
c099397a MD |
2002 | /* |
2003 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2004 | * Must be called with sessions_mutex held. |
c099397a MD |
2005 | */ |
2006 | static | |
a90917c3 | 2007 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2008 | { |
30bdb6e4 | 2009 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2010 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2011 | struct lttng_channel *chan; |
2012 | struct lttng_event *event; | |
c099397a MD |
2013 | int ret = 0; |
2014 | ||
2015 | if (!ACCESS_ONCE(session->active)) | |
2016 | return 0; | |
2017 | if (session->metadata_dumped) | |
2018 | goto skip_session; | |
c099397a | 2019 | |
d793d5e1 | 2020 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2021 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2022 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2023 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2024 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2025 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2026 | |
2027 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2028 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2029 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2030 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2031 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2032 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2033 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2034 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2035 | "\n" |
2036 | "trace {\n" | |
2037 | " major = %u;\n" | |
2038 | " minor = %u;\n" | |
30bdb6e4 | 2039 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2040 | " byte_order = %s;\n" |
2041 | " packet.header := struct {\n" | |
2042 | " uint32_t magic;\n" | |
1ec3f75a | 2043 | " uint8_t uuid[16];\n" |
d793d5e1 | 2044 | " uint32_t stream_id;\n" |
0eb25f58 | 2045 | " };\n" |
d793d5e1 | 2046 | "};\n\n", |
a90917c3 MD |
2047 | lttng_alignof(uint8_t) * CHAR_BIT, |
2048 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2049 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2050 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2051 | sizeof(unsigned long) * CHAR_BIT, |
2052 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2053 | CTF_SPEC_MAJOR, |
2054 | CTF_SPEC_MINOR, | |
d793d5e1 | 2055 | uuid_s, |
9928f844 | 2056 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2057 | "be" |
2058 | #else | |
2059 | "le" | |
2060 | #endif | |
2061 | ); | |
2062 | if (ret) | |
2063 | goto end; | |
2064 | ||
99dc9597 MD |
2065 | ret = lttng_metadata_printf(session, |
2066 | "env {\n" | |
a6058143 | 2067 | " hostname = \"%s\";\n" |
c6c9e10f | 2068 | " domain = \"kernel\";\n" |
99dc9597 | 2069 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2070 | " kernel_release = \"%s\";\n" |
2071 | " kernel_version = \"%s\";\n" | |
2072 | " tracer_name = \"lttng-modules\";\n" | |
2073 | " tracer_major = %d;\n" | |
2074 | " tracer_minor = %d;\n" | |
2075 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2076 | "};\n\n", |
3d0d43db | 2077 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2078 | utsname()->sysname, |
2079 | utsname()->release, | |
c6c9e10f MD |
2080 | utsname()->version, |
2081 | LTTNG_MODULES_MAJOR_VERSION, | |
2082 | LTTNG_MODULES_MINOR_VERSION, | |
2083 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2084 | ); |
2085 | if (ret) | |
2086 | goto end; | |
2087 | ||
a3ccff4f MD |
2088 | ret = lttng_metadata_printf(session, |
2089 | "clock {\n" | |
a82c63f1 MD |
2090 | " name = %s;\n", |
2091 | "monotonic" | |
2092 | ); | |
2093 | if (ret) | |
2094 | goto end; | |
2095 | ||
2096 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2097 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2098 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2099 | clock_uuid_s |
2100 | ); | |
2101 | if (ret) | |
2102 | goto end; | |
2103 | } | |
2104 | ||
2105 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
2106 | " description = \"Monotonic Clock\";\n" |
2107 | " freq = %llu; /* Frequency, in Hz */\n" | |
2108 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
2109 | " offset = %llu;\n" | |
2110 | "};\n\n", | |
a3ccff4f MD |
2111 | (unsigned long long) trace_clock_freq(), |
2112 | (unsigned long long) measure_clock_offset() | |
2113 | ); | |
2114 | if (ret) | |
2115 | goto end; | |
2116 | ||
2117 | ret = lttng_metadata_printf(session, | |
2118 | "typealias integer {\n" | |
2119 | " size = 27; align = 1; signed = false;\n" | |
2120 | " map = clock.monotonic.value;\n" | |
2121 | "} := uint27_clock_monotonic_t;\n" | |
2122 | "\n" | |
2123 | "typealias integer {\n" | |
2124 | " size = 32; align = %u; signed = false;\n" | |
2125 | " map = clock.monotonic.value;\n" | |
2126 | "} := uint32_clock_monotonic_t;\n" | |
2127 | "\n" | |
2128 | "typealias integer {\n" | |
2129 | " size = 64; align = %u; signed = false;\n" | |
2130 | " map = clock.monotonic.value;\n" | |
2131 | "} := uint64_clock_monotonic_t;\n\n", | |
2132 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2133 | lttng_alignof(uint64_t) * CHAR_BIT | |
2134 | ); | |
2135 | if (ret) | |
2136 | goto end; | |
2137 | ||
a90917c3 | 2138 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2139 | if (ret) |
2140 | goto end; | |
2141 | ||
a90917c3 | 2142 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2143 | if (ret) |
2144 | goto end; | |
2145 | ||
c099397a MD |
2146 | skip_session: |
2147 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2148 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2149 | if (ret) |
2150 | goto end; | |
2151 | } | |
2152 | ||
2153 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2154 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2155 | if (ret) |
2156 | goto end; | |
2157 | } | |
2158 | session->metadata_dumped = 1; | |
2159 | end: | |
2160 | return ret; | |
2161 | } | |
2162 | ||
c0e31d2e | 2163 | /** |
a90917c3 | 2164 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2165 | * @transport: transport structure |
2166 | * | |
2167 | * Registers a transport which can be used as output to extract the data out of | |
2168 | * LTTng. The module calling this registration function must ensure that no | |
2169 | * trap-inducing code will be executed by the transport functions. E.g. | |
2170 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2171 | * is made visible to the transport function. This registration acts as a | |
2172 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2173 | * after its registration must it synchronize the TLBs. | |
2174 | */ | |
a90917c3 | 2175 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2176 | { |
2177 | /* | |
2178 | * Make sure no page fault can be triggered by the module about to be | |
2179 | * registered. We deal with this here so we don't have to call | |
2180 | * vmalloc_sync_all() in each module's init. | |
2181 | */ | |
6d2a620c | 2182 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2183 | |
2184 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2185 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2186 | mutex_unlock(&sessions_mutex); |
2187 | } | |
a90917c3 | 2188 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2189 | |
2190 | /** | |
a90917c3 | 2191 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2192 | * @transport: transport structure |
2193 | */ | |
a90917c3 | 2194 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2195 | { |
2196 | mutex_lock(&sessions_mutex); | |
2197 | list_del(&transport->node); | |
2198 | mutex_unlock(&sessions_mutex); | |
2199 | } | |
a90917c3 | 2200 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2201 | |
a90917c3 | 2202 | static int __init lttng_events_init(void) |
4e3c1b9b | 2203 | { |
1c25284c MD |
2204 | int ret; |
2205 | ||
453b2495 JD |
2206 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2207 | if (ret) | |
2208 | return ret; | |
389d7070 | 2209 | ret = wrapper_get_pfnblock_flags_mask_init(); |
70795b22 MD |
2210 | if (ret) |
2211 | return ret; | |
2212 | ret = wrapper_get_pageblock_flags_mask_init(); | |
389d7070 MD |
2213 | if (ret) |
2214 | return ret; | |
07dfc1d0 | 2215 | ret = lttng_context_init(); |
20591cf7 MD |
2216 | if (ret) |
2217 | return ret; | |
07dfc1d0 MD |
2218 | ret = lttng_tracepoint_init(); |
2219 | if (ret) | |
2220 | goto error_tp; | |
a90917c3 | 2221 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2222 | if (!event_cache) { |
2223 | ret = -ENOMEM; | |
2224 | goto error_kmem; | |
2225 | } | |
80996790 | 2226 | ret = lttng_abi_init(); |
02119ee5 MD |
2227 | if (ret) |
2228 | goto error_abi; | |
0c956676 MD |
2229 | ret = lttng_logger_init(); |
2230 | if (ret) | |
2231 | goto error_logger; | |
4e3c1b9b | 2232 | return 0; |
0c956676 MD |
2233 | |
2234 | error_logger: | |
2235 | lttng_abi_exit(); | |
02119ee5 | 2236 | error_abi: |
1c25284c | 2237 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2238 | error_kmem: |
2239 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2240 | error_tp: |
2241 | lttng_context_exit(); | |
1c25284c | 2242 | return ret; |
4e3c1b9b MD |
2243 | } |
2244 | ||
a90917c3 | 2245 | module_init(lttng_events_init); |
11b5a3c2 | 2246 | |
a90917c3 | 2247 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2248 | { |
a90917c3 | 2249 | struct lttng_session *session, *tmpsession; |
92e94819 | 2250 | |
0c956676 | 2251 | lttng_logger_exit(); |
80996790 | 2252 | lttng_abi_exit(); |
92e94819 | 2253 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2254 | lttng_session_destroy(session); |
11b5a3c2 | 2255 | kmem_cache_destroy(event_cache); |
20591cf7 | 2256 | lttng_tracepoint_exit(); |
07dfc1d0 | 2257 | lttng_context_exit(); |
4e3c1b9b | 2258 | } |
92e94819 | 2259 | |
a90917c3 | 2260 | module_exit(lttng_events_exit); |
11b5a3c2 | 2261 | |
92e94819 MD |
2262 | MODULE_LICENSE("GPL and additional rights"); |
2263 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2264 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2265 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2266 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2267 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2268 | LTTNG_MODULES_EXTRAVERSION); |