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 | 242 | /* Clear each stream's quiescent state. */ |
8d1ce881 MD |
243 | list_for_each_entry(chan, &session->chan, list) { |
244 | if (chan->channel_type != METADATA_CHANNEL) | |
245 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
246 | } | |
088b3346 | 247 | |
52fc2e1f | 248 | ACCESS_ONCE(session->active) = 1; |
8070f5c0 | 249 | ACCESS_ONCE(session->been_active) = 1; |
a90917c3 | 250 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 MD |
251 | if (ret) { |
252 | ACCESS_ONCE(session->active) = 0; | |
253 | goto end; | |
254 | } | |
255 | ret = lttng_statedump_start(session); | |
360f38ea | 256 | if (ret) |
c099397a | 257 | ACCESS_ONCE(session->active) = 0; |
c0e31d2e MD |
258 | end: |
259 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 260 | return ret; |
c0e31d2e MD |
261 | } |
262 | ||
a90917c3 | 263 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
264 | { |
265 | int ret = 0; | |
088b3346 | 266 | struct lttng_channel *chan; |
c0e31d2e MD |
267 | |
268 | mutex_lock(&sessions_mutex); | |
269 | if (!session->active) { | |
270 | ret = -EBUSY; | |
271 | goto end; | |
272 | } | |
52fc2e1f | 273 | ACCESS_ONCE(session->active) = 0; |
3c997079 MD |
274 | |
275 | /* Set transient enabler state to "disabled" */ | |
276 | session->tstate = 0; | |
277 | lttng_session_sync_enablers(session); | |
088b3346 MD |
278 | |
279 | /* Set each stream's quiescent state. */ | |
8d1ce881 MD |
280 | list_for_each_entry(chan, &session->chan, list) { |
281 | if (chan->channel_type != METADATA_CHANNEL) | |
282 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
283 | } | |
c0e31d2e MD |
284 | end: |
285 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 286 | return ret; |
c0e31d2e MD |
287 | } |
288 | ||
a90917c3 | 289 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 290 | { |
3c997079 | 291 | int ret = 0; |
e64957da | 292 | |
3c997079 MD |
293 | mutex_lock(&sessions_mutex); |
294 | if (channel->channel_type == METADATA_CHANNEL) { | |
295 | ret = -EPERM; | |
296 | goto end; | |
297 | } | |
298 | if (channel->enabled) { | |
299 | ret = -EEXIST; | |
300 | goto end; | |
301 | } | |
302 | /* Set transient enabler state to "enabled" */ | |
303 | channel->tstate = 1; | |
304 | lttng_session_sync_enablers(channel->session); | |
305 | /* Set atomically the state to "enabled" */ | |
306 | ACCESS_ONCE(channel->enabled) = 1; | |
307 | end: | |
308 | mutex_unlock(&sessions_mutex); | |
309 | return ret; | |
e64957da MD |
310 | } |
311 | ||
a90917c3 | 312 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 313 | { |
3c997079 | 314 | int ret = 0; |
e64957da | 315 | |
3c997079 MD |
316 | mutex_lock(&sessions_mutex); |
317 | if (channel->channel_type == METADATA_CHANNEL) { | |
318 | ret = -EPERM; | |
319 | goto end; | |
320 | } | |
321 | if (!channel->enabled) { | |
322 | ret = -EEXIST; | |
323 | goto end; | |
324 | } | |
325 | /* Set atomically the state to "disabled" */ | |
326 | ACCESS_ONCE(channel->enabled) = 0; | |
327 | /* Set transient enabler state to "enabled" */ | |
328 | channel->tstate = 0; | |
329 | lttng_session_sync_enablers(channel->session); | |
330 | end: | |
331 | mutex_unlock(&sessions_mutex); | |
332 | return ret; | |
e64957da MD |
333 | } |
334 | ||
a90917c3 | 335 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 336 | { |
3c997079 | 337 | int ret = 0; |
e64957da | 338 | |
3c997079 MD |
339 | mutex_lock(&sessions_mutex); |
340 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
341 | ret = -EPERM; | |
342 | goto end; | |
343 | } | |
344 | if (event->enabled) { | |
345 | ret = -EEXIST; | |
346 | goto end; | |
347 | } | |
4598b13b MD |
348 | switch (event->instrumentation) { |
349 | case LTTNG_KERNEL_TRACEPOINT: | |
350 | case LTTNG_KERNEL_SYSCALL: | |
351 | ret = -EINVAL; | |
352 | break; | |
353 | case LTTNG_KERNEL_KPROBE: | |
354 | case LTTNG_KERNEL_FUNCTION: | |
355 | case LTTNG_KERNEL_NOOP: | |
356 | ACCESS_ONCE(event->enabled) = 1; | |
357 | break; | |
358 | case LTTNG_KERNEL_KRETPROBE: | |
359 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
360 | break; | |
361 | default: | |
362 | WARN_ON_ONCE(1); | |
363 | ret = -EINVAL; | |
364 | } | |
3c997079 MD |
365 | end: |
366 | mutex_unlock(&sessions_mutex); | |
367 | return ret; | |
e64957da MD |
368 | } |
369 | ||
a90917c3 | 370 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 371 | { |
3c997079 | 372 | int ret = 0; |
e64957da | 373 | |
3c997079 MD |
374 | mutex_lock(&sessions_mutex); |
375 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
376 | ret = -EPERM; | |
377 | goto end; | |
378 | } | |
379 | if (!event->enabled) { | |
380 | ret = -EEXIST; | |
381 | goto end; | |
382 | } | |
4598b13b MD |
383 | switch (event->instrumentation) { |
384 | case LTTNG_KERNEL_TRACEPOINT: | |
385 | case LTTNG_KERNEL_SYSCALL: | |
386 | ret = -EINVAL; | |
387 | break; | |
388 | case LTTNG_KERNEL_KPROBE: | |
389 | case LTTNG_KERNEL_FUNCTION: | |
390 | case LTTNG_KERNEL_NOOP: | |
391 | ACCESS_ONCE(event->enabled) = 0; | |
392 | break; | |
393 | case LTTNG_KERNEL_KRETPROBE: | |
394 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
395 | break; | |
396 | default: | |
397 | WARN_ON_ONCE(1); | |
398 | ret = -EINVAL; | |
399 | } | |
3c997079 MD |
400 | end: |
401 | mutex_unlock(&sessions_mutex); | |
402 | return ret; | |
e64957da MD |
403 | } |
404 | ||
a90917c3 | 405 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 406 | { |
a90917c3 | 407 | struct lttng_transport *transport; |
f3d01b96 | 408 | |
a90917c3 | 409 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
410 | if (!strcmp(transport->name, name)) |
411 | return transport; | |
412 | } | |
413 | return NULL; | |
414 | } | |
415 | ||
a90917c3 | 416 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
417 | const char *transport_name, |
418 | void *buf_addr, | |
4e3c1b9b MD |
419 | size_t subbuf_size, size_t num_subbuf, |
420 | unsigned int switch_timer_interval, | |
d83004aa JD |
421 | unsigned int read_timer_interval, |
422 | enum channel_type channel_type) | |
4e3c1b9b | 423 | { |
a90917c3 MD |
424 | struct lttng_channel *chan; |
425 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
426 | |
427 | mutex_lock(&sessions_mutex); | |
d83004aa | 428 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 429 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 430 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
431 | if (!transport) { |
432 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
433 | transport_name); | |
c0e31d2e | 434 | goto notransport; |
f3d01b96 | 435 | } |
a33c9927 MD |
436 | if (!try_module_get(transport->owner)) { |
437 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
438 | goto notransport; | |
439 | } | |
a90917c3 | 440 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 441 | if (!chan) |
c0e31d2e | 442 | goto nomem; |
4e3c1b9b | 443 | chan->session = session; |
05d32c64 | 444 | chan->id = session->free_chan_id++; |
3b731ab1 | 445 | chan->ops = &transport->ops; |
125b4df4 MD |
446 | /* |
447 | * Note: the channel creation op already writes into the packet | |
448 | * headers. Therefore the "chan" information used as input | |
449 | * should be already accessible. | |
450 | */ | |
5f5ddf01 MD |
451 | chan->chan = transport->ops.channel_create(transport_name, |
452 | chan, buf_addr, subbuf_size, num_subbuf, | |
453 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
454 | if (!chan->chan) |
455 | goto create_error; | |
3c997079 | 456 | chan->tstate = 1; |
e64957da | 457 | chan->enabled = 1; |
a33c9927 | 458 | chan->transport = transport; |
d83004aa | 459 | chan->channel_type = channel_type; |
4e3c1b9b MD |
460 | list_add(&chan->list, &session->chan); |
461 | mutex_unlock(&sessions_mutex); | |
462 | return chan; | |
463 | ||
f3d01b96 MD |
464 | create_error: |
465 | kfree(chan); | |
c0e31d2e | 466 | nomem: |
a33c9927 MD |
467 | if (transport) |
468 | module_put(transport->owner); | |
c0e31d2e | 469 | notransport: |
e5382b6d | 470 | active: |
4e3c1b9b MD |
471 | mutex_unlock(&sessions_mutex); |
472 | return NULL; | |
473 | } | |
474 | ||
475 | /* | |
d83004aa JD |
476 | * Only used internally at session destruction for per-cpu channels, and |
477 | * when metadata channel is released. | |
478 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 479 | */ |
aa7c23a9 | 480 | static |
a90917c3 | 481 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 482 | { |
11b5a3c2 | 483 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 484 | module_put(chan->transport->owner); |
4e3c1b9b | 485 | list_del(&chan->list); |
8070f5c0 | 486 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
487 | kfree(chan); |
488 | } | |
489 | ||
d83004aa JD |
490 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
491 | { | |
492 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
493 | ||
494 | /* Protect the metadata cache with the sessions_mutex. */ | |
495 | mutex_lock(&sessions_mutex); | |
496 | _lttng_channel_destroy(chan); | |
497 | mutex_unlock(&sessions_mutex); | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
500 | ||
501 | static | |
502 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
503 | { | |
504 | stream->finalized = 1; | |
505 | wake_up_interruptible(&stream->read_wait); | |
506 | } | |
507 | ||
e5382b6d MD |
508 | /* |
509 | * Supports event creation while tracing session is active. | |
3c997079 | 510 | * Needs to be called with sessions mutex held. |
e5382b6d | 511 | */ |
3c997079 MD |
512 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
513 | struct lttng_kernel_event *event_param, | |
514 | void *filter, | |
515 | const struct lttng_event_desc *event_desc, | |
516 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 517 | { |
3c997079 | 518 | struct lttng_session *session = chan->session; |
a90917c3 | 519 | struct lttng_event *event; |
3c997079 MD |
520 | const char *event_name; |
521 | struct hlist_head *head; | |
522 | size_t name_len; | |
523 | uint32_t hash; | |
3d084699 | 524 | int ret; |
4e3c1b9b | 525 | |
abc0446a | 526 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 527 | ret = -EMFILE; |
e5382b6d | 528 | goto full; |
abc0446a | 529 | } |
3c997079 MD |
530 | |
531 | switch (itype) { | |
532 | case LTTNG_KERNEL_TRACEPOINT: | |
533 | event_name = event_desc->name; | |
534 | break; | |
535 | case LTTNG_KERNEL_KPROBE: | |
536 | case LTTNG_KERNEL_KRETPROBE: | |
537 | case LTTNG_KERNEL_FUNCTION: | |
538 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 539 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
540 | event_name = event_param->name; |
541 | break; | |
542 | default: | |
543 | WARN_ON_ONCE(1); | |
544 | ret = -EINVAL; | |
545 | goto type_error; | |
546 | } | |
547 | name_len = strlen(event_name); | |
548 | hash = jhash(event_name, name_len, 0); | |
549 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 550 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
551 | WARN_ON_ONCE(!event->desc); |
552 | if (!strncmp(event->desc->name, event_name, | |
553 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
554 | && chan == event->chan) { | |
555 | ret = -EEXIST; | |
556 | goto exist; | |
abc0446a MD |
557 | } |
558 | } | |
3c997079 | 559 | |
11b5a3c2 | 560 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 561 | if (!event) { |
4cf0bf51 | 562 | ret = -ENOMEM; |
4e3c1b9b | 563 | goto cache_error; |
abc0446a | 564 | } |
4e3c1b9b MD |
565 | event->chan = chan; |
566 | event->filter = filter; | |
e5382b6d | 567 | event->id = chan->free_event_id++; |
3c997079 MD |
568 | event->instrumentation = itype; |
569 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 570 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
571 | INIT_LIST_HEAD(&event->enablers_ref_head); |
572 | ||
573 | switch (itype) { | |
ab2277d6 | 574 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
575 | /* Event will be enabled by enabler sync. */ |
576 | event->enabled = 0; | |
577 | event->registered = 0; | |
578 | event->desc = lttng_event_get(event_name); | |
abc0446a | 579 | if (!event->desc) { |
4cf0bf51 | 580 | ret = -ENOENT; |
d3dbe23c | 581 | goto register_error; |
abc0446a | 582 | } |
3c997079 MD |
583 | /* Populate lttng_event structure before event registration. */ |
584 | smp_wmb(); | |
baf20995 | 585 | break; |
ab2277d6 | 586 | case LTTNG_KERNEL_KPROBE: |
4598b13b MD |
587 | /* |
588 | * Needs to be explicitly enabled after creation, since | |
589 | * we may want to apply filters. | |
590 | */ | |
591 | event->enabled = 0; | |
3c997079 MD |
592 | event->registered = 1; |
593 | /* | |
594 | * Populate lttng_event structure before event | |
595 | * registration. | |
596 | */ | |
597 | smp_wmb(); | |
598 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
599 | event_param->u.kprobe.symbol_name, |
600 | event_param->u.kprobe.offset, | |
601 | event_param->u.kprobe.addr, | |
602 | event); | |
abc0446a | 603 | if (ret) { |
4cf0bf51 | 604 | ret = -EINVAL; |
d6d808f3 | 605 | goto register_error; |
abc0446a | 606 | } |
edeb3137 MD |
607 | ret = try_module_get(event->desc->owner); |
608 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 609 | break; |
7371f44c MD |
610 | case LTTNG_KERNEL_KRETPROBE: |
611 | { | |
a90917c3 | 612 | struct lttng_event *event_return; |
7371f44c MD |
613 | |
614 | /* kretprobe defines 2 events */ | |
4598b13b MD |
615 | /* |
616 | * Needs to be explicitly enabled after creation, since | |
617 | * we may want to apply filters. | |
618 | */ | |
619 | event->enabled = 0; | |
3c997079 | 620 | event->registered = 1; |
7371f44c MD |
621 | event_return = |
622 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 623 | if (!event_return) { |
4cf0bf51 | 624 | ret = -ENOMEM; |
7371f44c | 625 | goto register_error; |
abc0446a | 626 | } |
7371f44c MD |
627 | event_return->chan = chan; |
628 | event_return->filter = filter; | |
629 | event_return->id = chan->free_event_id++; | |
4598b13b | 630 | event_return->enabled = 0; |
3c997079 MD |
631 | event_return->registered = 1; |
632 | event_return->instrumentation = itype; | |
7371f44c | 633 | /* |
a90917c3 | 634 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
635 | */ |
636 | smp_wmb(); | |
3c997079 | 637 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
638 | event_param->u.kretprobe.symbol_name, |
639 | event_param->u.kretprobe.offset, | |
640 | event_param->u.kretprobe.addr, | |
641 | event, event_return); | |
642 | if (ret) { | |
643 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 644 | ret = -EINVAL; |
7371f44c MD |
645 | goto register_error; |
646 | } | |
647 | /* Take 2 refs on the module: one per event. */ | |
648 | ret = try_module_get(event->desc->owner); | |
649 | WARN_ON_ONCE(!ret); | |
650 | ret = try_module_get(event->desc->owner); | |
651 | WARN_ON_ONCE(!ret); | |
a90917c3 | 652 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 653 | event_return); |
abc0446a | 654 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
655 | if (ret) { |
656 | kmem_cache_free(event_cache, event_return); | |
657 | module_put(event->desc->owner); | |
658 | module_put(event->desc->owner); | |
659 | goto statedump_error; | |
660 | } | |
661 | list_add(&event_return->list, &chan->session->events); | |
662 | break; | |
663 | } | |
ab2277d6 | 664 | case LTTNG_KERNEL_FUNCTION: |
4598b13b MD |
665 | /* |
666 | * Needs to be explicitly enabled after creation, since | |
667 | * we may want to apply filters. | |
668 | */ | |
669 | event->enabled = 0; | |
3c997079 MD |
670 | event->registered = 1; |
671 | /* | |
672 | * Populate lttng_event structure before event | |
673 | * registration. | |
674 | */ | |
675 | smp_wmb(); | |
676 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
677 | event_param->u.ftrace.symbol_name, |
678 | event); | |
abc0446a | 679 | if (ret) { |
e0a7a7c4 | 680 | goto register_error; |
abc0446a | 681 | } |
edeb3137 MD |
682 | ret = try_module_get(event->desc->owner); |
683 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 684 | break; |
1ec65de1 | 685 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 686 | case LTTNG_KERNEL_SYSCALL: |
4598b13b MD |
687 | /* |
688 | * Needs to be explicitly enabled after creation, since | |
689 | * we may want to apply filters. | |
690 | */ | |
691 | event->enabled = 0; | |
3c997079 MD |
692 | event->registered = 0; |
693 | event->desc = event_desc; | |
abc0446a | 694 | if (!event->desc) { |
4cf0bf51 | 695 | ret = -EINVAL; |
259b6cb3 | 696 | goto register_error; |
abc0446a | 697 | } |
1ec65de1 | 698 | break; |
baf20995 MD |
699 | default: |
700 | WARN_ON_ONCE(1); | |
4cf0bf51 | 701 | ret = -EINVAL; |
df07930b | 702 | goto register_error; |
baf20995 | 703 | } |
a90917c3 | 704 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
705 | WARN_ON_ONCE(ret > 0); |
706 | if (ret) { | |
c099397a | 707 | goto statedump_error; |
abc0446a | 708 | } |
3c997079 | 709 | hlist_add_head(&event->hlist, head); |
dda6a249 | 710 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
711 | return event; |
712 | ||
c099397a | 713 | statedump_error: |
259b6cb3 | 714 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 715 | register_error: |
11b5a3c2 | 716 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
717 | cache_error: |
718 | exist: | |
3c997079 | 719 | type_error: |
e5382b6d | 720 | full: |
4cf0bf51 | 721 | return ERR_PTR(ret); |
4e3c1b9b MD |
722 | } |
723 | ||
3c997079 MD |
724 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
725 | struct lttng_kernel_event *event_param, | |
726 | void *filter, | |
727 | const struct lttng_event_desc *event_desc, | |
728 | enum lttng_kernel_instrumentation itype) | |
729 | { | |
730 | struct lttng_event *event; | |
731 | ||
732 | mutex_lock(&sessions_mutex); | |
733 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
734 | itype); | |
735 | mutex_unlock(&sessions_mutex); | |
736 | return event; | |
737 | } | |
738 | ||
739 | /* Only used for tracepoints for now. */ | |
740 | static | |
741 | void register_event(struct lttng_event *event) | |
742 | { | |
743 | const struct lttng_event_desc *desc; | |
f127e61e | 744 | int ret = -EINVAL; |
3c997079 | 745 | |
3c997079 MD |
746 | if (event->registered) |
747 | return; | |
4ecb5ad5 | 748 | |
3c997079 | 749 | desc = event->desc; |
4ecb5ad5 MD |
750 | switch (event->instrumentation) { |
751 | case LTTNG_KERNEL_TRACEPOINT: | |
752 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
753 | desc->probe_callback, | |
754 | event); | |
755 | break; | |
756 | case LTTNG_KERNEL_SYSCALL: | |
757 | ret = lttng_syscall_filter_enable(event->chan, | |
758 | desc->name); | |
759 | break; | |
760 | case LTTNG_KERNEL_KPROBE: | |
761 | case LTTNG_KERNEL_KRETPROBE: | |
762 | case LTTNG_KERNEL_FUNCTION: | |
763 | case LTTNG_KERNEL_NOOP: | |
764 | ret = 0; | |
765 | break; | |
766 | default: | |
767 | WARN_ON_ONCE(1); | |
768 | } | |
3c997079 MD |
769 | if (!ret) |
770 | event->registered = 1; | |
771 | } | |
772 | ||
4e3c1b9b MD |
773 | /* |
774 | * Only used internally at session destruction. | |
775 | */ | |
a90917c3 | 776 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 777 | { |
4ecb5ad5 | 778 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
779 | int ret = -EINVAL; |
780 | ||
3c997079 MD |
781 | if (!event->registered) |
782 | return 0; | |
783 | ||
4ecb5ad5 | 784 | desc = event->desc; |
38d024ae | 785 | switch (event->instrumentation) { |
ab2277d6 | 786 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 787 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 788 | event->desc->probe_callback, |
11b5a3c2 | 789 | event); |
baf20995 | 790 | break; |
ab2277d6 | 791 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 792 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
793 | ret = 0; |
794 | break; | |
7371f44c MD |
795 | case LTTNG_KERNEL_KRETPROBE: |
796 | lttng_kretprobes_unregister(event); | |
797 | ret = 0; | |
798 | break; | |
ab2277d6 | 799 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
800 | lttng_ftrace_unregister(event); |
801 | ret = 0; | |
802 | break; | |
33a39a3c | 803 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
804 | ret = lttng_syscall_filter_disable(event->chan, |
805 | desc->name); | |
806 | break; | |
807 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
808 | ret = 0; |
809 | break; | |
baf20995 MD |
810 | default: |
811 | WARN_ON_ONCE(1); | |
812 | } | |
3c997079 MD |
813 | if (!ret) |
814 | event->registered = 0; | |
dda6a249 MD |
815 | return ret; |
816 | } | |
817 | ||
818 | /* | |
819 | * Only used internally at session destruction. | |
820 | */ | |
be066e6c | 821 | static |
a90917c3 | 822 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 823 | { |
edeb3137 MD |
824 | switch (event->instrumentation) { |
825 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 826 | lttng_event_put(event->desc); |
edeb3137 MD |
827 | break; |
828 | case LTTNG_KERNEL_KPROBE: | |
829 | module_put(event->desc->owner); | |
830 | lttng_kprobes_destroy_private(event); | |
831 | break; | |
7371f44c MD |
832 | case LTTNG_KERNEL_KRETPROBE: |
833 | module_put(event->desc->owner); | |
834 | lttng_kretprobes_destroy_private(event); | |
835 | break; | |
edeb3137 MD |
836 | case LTTNG_KERNEL_FUNCTION: |
837 | module_put(event->desc->owner); | |
838 | lttng_ftrace_destroy_private(event); | |
839 | break; | |
259b6cb3 | 840 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 841 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 842 | break; |
edeb3137 MD |
843 | default: |
844 | WARN_ON_ONCE(1); | |
845 | } | |
dda6a249 | 846 | list_del(&event->list); |
8070f5c0 | 847 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 848 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
849 | } |
850 | ||
e0130fab MD |
851 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
852 | { | |
853 | int ret; | |
854 | ||
855 | if (pid < -1) | |
856 | return -EINVAL; | |
857 | mutex_lock(&sessions_mutex); | |
858 | if (pid == -1) { | |
859 | /* track all pids: destroy tracker. */ | |
860 | if (session->pid_tracker) { | |
861 | struct lttng_pid_tracker *lpf; | |
862 | ||
863 | lpf = session->pid_tracker; | |
864 | rcu_assign_pointer(session->pid_tracker, NULL); | |
865 | synchronize_trace(); | |
866 | lttng_pid_tracker_destroy(lpf); | |
867 | } | |
868 | ret = 0; | |
869 | } else { | |
870 | if (!session->pid_tracker) { | |
871 | struct lttng_pid_tracker *lpf; | |
872 | ||
873 | lpf = lttng_pid_tracker_create(); | |
874 | if (!lpf) { | |
875 | ret = -ENOMEM; | |
876 | goto unlock; | |
877 | } | |
878 | ret = lttng_pid_tracker_add(lpf, pid); | |
879 | rcu_assign_pointer(session->pid_tracker, lpf); | |
880 | } else { | |
881 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
882 | } | |
883 | } | |
884 | unlock: | |
885 | mutex_unlock(&sessions_mutex); | |
886 | return ret; | |
887 | } | |
888 | ||
889 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
890 | { | |
891 | int ret; | |
892 | ||
893 | if (pid < -1) | |
894 | return -EINVAL; | |
895 | mutex_lock(&sessions_mutex); | |
896 | if (pid == -1) { | |
897 | /* untrack all pids: replace by empty tracker. */ | |
898 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
899 | struct lttng_pid_tracker *lpf; | |
900 | ||
901 | lpf = lttng_pid_tracker_create(); | |
902 | if (!lpf) { | |
903 | ret = -ENOMEM; | |
904 | goto unlock; | |
905 | } | |
906 | rcu_assign_pointer(session->pid_tracker, lpf); | |
907 | synchronize_trace(); | |
908 | if (old_lpf) | |
909 | lttng_pid_tracker_destroy(old_lpf); | |
910 | ret = 0; | |
911 | } else { | |
912 | if (!session->pid_tracker) { | |
913 | ret = -ENOENT; | |
914 | goto unlock; | |
915 | } | |
916 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
917 | } | |
918 | unlock: | |
919 | mutex_unlock(&sessions_mutex); | |
920 | return ret; | |
921 | } | |
922 | ||
7e6f9ef6 MD |
923 | static |
924 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
925 | { | |
926 | struct lttng_session *session = m->private; | |
927 | struct lttng_pid_tracker *lpf; | |
928 | struct lttng_pid_hash_node *e; | |
929 | int iter = 0, i; | |
930 | ||
931 | mutex_lock(&sessions_mutex); | |
932 | lpf = session->pid_tracker; | |
933 | if (lpf) { | |
934 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
935 | struct hlist_head *head = &lpf->pid_hash[i]; | |
936 | ||
f934e302 | 937 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
938 | if (iter++ >= *pos) |
939 | return e; | |
940 | } | |
941 | } | |
942 | } else { | |
943 | /* PID tracker disabled. */ | |
944 | if (iter >= *pos && iter == 0) { | |
945 | return session; /* empty tracker */ | |
946 | } | |
947 | iter++; | |
948 | } | |
949 | /* End of list */ | |
950 | return NULL; | |
951 | } | |
952 | ||
953 | /* Called with sessions_mutex held. */ | |
954 | static | |
955 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
956 | { | |
957 | struct lttng_session *session = m->private; | |
958 | struct lttng_pid_tracker *lpf; | |
959 | struct lttng_pid_hash_node *e; | |
960 | int iter = 0, i; | |
961 | ||
962 | (*ppos)++; | |
963 | lpf = session->pid_tracker; | |
964 | if (lpf) { | |
965 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
966 | struct hlist_head *head = &lpf->pid_hash[i]; | |
967 | ||
f934e302 | 968 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
969 | if (iter++ >= *ppos) |
970 | return e; | |
971 | } | |
972 | } | |
973 | } else { | |
974 | /* PID tracker disabled. */ | |
975 | if (iter >= *ppos && iter == 0) | |
976 | return session; /* empty tracker */ | |
977 | iter++; | |
978 | } | |
979 | ||
980 | /* End of list */ | |
981 | return NULL; | |
982 | } | |
983 | ||
984 | static | |
985 | void pid_list_stop(struct seq_file *m, void *p) | |
986 | { | |
987 | mutex_unlock(&sessions_mutex); | |
988 | } | |
989 | ||
990 | static | |
991 | int pid_list_show(struct seq_file *m, void *p) | |
992 | { | |
993 | int pid; | |
994 | ||
995 | if (p == m->private) { | |
996 | /* Tracker disabled. */ | |
997 | pid = -1; | |
998 | } else { | |
999 | const struct lttng_pid_hash_node *e = p; | |
1000 | ||
1001 | pid = lttng_pid_tracker_get_node_pid(e); | |
1002 | } | |
1003 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static | |
1008 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1009 | .start = pid_list_start, | |
1010 | .next = pid_list_next, | |
1011 | .stop = pid_list_stop, | |
1012 | .show = pid_list_show, | |
1013 | }; | |
1014 | ||
1015 | static | |
1016 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1017 | { | |
1018 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1019 | } | |
1020 | ||
1021 | static | |
1022 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1023 | { | |
1024 | struct seq_file *m = file->private_data; | |
1025 | struct lttng_session *session = m->private; | |
1026 | int ret; | |
1027 | ||
1028 | WARN_ON_ONCE(!session); | |
1029 | ret = seq_release(inode, file); | |
1030 | if (!ret && session) | |
1031 | fput(session->file); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
1035 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1036 | .owner = THIS_MODULE, | |
1037 | .open = lttng_tracker_pids_list_open, | |
1038 | .read = seq_read, | |
1039 | .llseek = seq_lseek, | |
1040 | .release = lttng_tracker_pids_list_release, | |
1041 | }; | |
1042 | ||
1043 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1044 | { | |
1045 | struct file *tracker_pids_list_file; | |
1046 | struct seq_file *m; | |
1047 | int file_fd, ret; | |
1048 | ||
1049 | file_fd = lttng_get_unused_fd(); | |
1050 | if (file_fd < 0) { | |
1051 | ret = file_fd; | |
1052 | goto fd_error; | |
1053 | } | |
1054 | ||
1055 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1056 | <tng_tracker_pids_list_fops, | |
1057 | NULL, O_RDWR); | |
1058 | if (IS_ERR(tracker_pids_list_file)) { | |
1059 | ret = PTR_ERR(tracker_pids_list_file); | |
1060 | goto file_error; | |
1061 | } | |
4ce9f32b MD |
1062 | if (atomic_long_add_unless(&session->file->f_count, |
1063 | 1, INT_MAX) == INT_MAX) { | |
1064 | goto refcount_error; | |
1065 | } | |
7e6f9ef6 MD |
1066 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1067 | if (ret < 0) | |
1068 | goto open_error; | |
1069 | m = tracker_pids_list_file->private_data; | |
1070 | m->private = session; | |
1071 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1072 | |
1073 | return file_fd; | |
1074 | ||
1075 | open_error: | |
4ce9f32b MD |
1076 | atomic_long_dec(&session->file->f_count); |
1077 | refcount_error: | |
7e6f9ef6 MD |
1078 | fput(tracker_pids_list_file); |
1079 | file_error: | |
1080 | put_unused_fd(file_fd); | |
1081 | fd_error: | |
1082 | return ret; | |
1083 | } | |
1084 | ||
3c997079 MD |
1085 | /* |
1086 | * Enabler management. | |
1087 | */ | |
1088 | static | |
4ecb5ad5 MD |
1089 | int lttng_match_enabler_wildcard(const char *desc_name, |
1090 | const char *name) | |
3c997079 | 1091 | { |
3c997079 | 1092 | /* Compare excluding final '*' */ |
4ecb5ad5 | 1093 | if (strncmp(desc_name, name, strlen(name) - 1)) |
3c997079 MD |
1094 | return 0; |
1095 | return 1; | |
1096 | } | |
1097 | ||
1098 | static | |
4ecb5ad5 MD |
1099 | int lttng_match_enabler_name(const char *desc_name, |
1100 | const char *name) | |
3c997079 | 1101 | { |
4ecb5ad5 | 1102 | if (strcmp(desc_name, name)) |
3c997079 MD |
1103 | return 0; |
1104 | return 1; | |
1105 | } | |
1106 | ||
1107 | static | |
1108 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1109 | struct lttng_enabler *enabler) | |
1110 | { | |
4ecb5ad5 MD |
1111 | const char *desc_name, *enabler_name; |
1112 | ||
1113 | enabler_name = enabler->event_param.name; | |
1114 | switch (enabler->event_param.instrumentation) { | |
1115 | case LTTNG_KERNEL_TRACEPOINT: | |
1116 | desc_name = desc->name; | |
1117 | break; | |
1118 | case LTTNG_KERNEL_SYSCALL: | |
1119 | desc_name = desc->name; | |
1120 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1121 | desc_name += strlen("compat_"); | |
1122 | if (!strncmp(desc_name, "syscall_exit_", | |
1123 | strlen("syscall_exit_"))) { | |
1124 | desc_name += strlen("syscall_exit_"); | |
1125 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1126 | strlen("syscall_entry_"))) { | |
1127 | desc_name += strlen("syscall_entry_"); | |
1128 | } else { | |
1129 | WARN_ON_ONCE(1); | |
1130 | return -EINVAL; | |
1131 | } | |
1132 | break; | |
1133 | default: | |
1134 | WARN_ON_ONCE(1); | |
1135 | return -EINVAL; | |
1136 | } | |
3c997079 MD |
1137 | switch (enabler->type) { |
1138 | case LTTNG_ENABLER_WILDCARD: | |
4ecb5ad5 | 1139 | return lttng_match_enabler_wildcard(desc_name, enabler_name); |
3c997079 | 1140 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1141 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1142 | default: |
1143 | return -EINVAL; | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | static | |
1148 | int lttng_event_match_enabler(struct lttng_event *event, | |
1149 | struct lttng_enabler *enabler) | |
1150 | { | |
33a39a3c MD |
1151 | if (enabler->event_param.instrumentation != event->instrumentation) |
1152 | return 0; | |
3c997079 MD |
1153 | if (lttng_desc_match_enabler(event->desc, enabler) |
1154 | && event->chan == enabler->chan) | |
1155 | return 1; | |
1156 | else | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | static | |
1161 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1162 | struct lttng_enabler *enabler) | |
1163 | { | |
1164 | struct lttng_enabler_ref *enabler_ref; | |
1165 | ||
1166 | list_for_each_entry(enabler_ref, | |
1167 | &event->enablers_ref_head, node) { | |
1168 | if (enabler_ref->ref == enabler) | |
1169 | return enabler_ref; | |
1170 | } | |
1171 | return NULL; | |
1172 | } | |
1173 | ||
3c997079 | 1174 | static |
33a39a3c | 1175 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1176 | { |
1177 | struct lttng_session *session = enabler->chan->session; | |
1178 | struct lttng_probe_desc *probe_desc; | |
1179 | const struct lttng_event_desc *desc; | |
1180 | int i; | |
1181 | struct list_head *probe_list; | |
1182 | ||
1183 | probe_list = lttng_get_probe_list_head(); | |
1184 | /* | |
1185 | * For each probe event, if we find that a probe event matches | |
1186 | * our enabler, create an associated lttng_event if not | |
1187 | * already present. | |
1188 | */ | |
1189 | list_for_each_entry(probe_desc, probe_list, head) { | |
1190 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1191 | int found = 0; | |
1192 | struct hlist_head *head; | |
1193 | const char *event_name; | |
1194 | size_t name_len; | |
1195 | uint32_t hash; | |
1196 | struct lttng_event *event; | |
1197 | ||
1198 | desc = probe_desc->event_desc[i]; | |
1199 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1200 | continue; | |
1201 | event_name = desc->name; | |
1202 | name_len = strlen(event_name); | |
1203 | ||
1204 | /* | |
1205 | * Check if already created. | |
1206 | */ | |
1207 | hash = jhash(event_name, name_len, 0); | |
1208 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1209 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1210 | if (event->desc == desc |
1211 | && event->chan == enabler->chan) | |
1212 | found = 1; | |
1213 | } | |
1214 | if (found) | |
1215 | continue; | |
1216 | ||
1217 | /* | |
1218 | * We need to create an event for this | |
1219 | * event probe. | |
1220 | */ | |
1221 | event = _lttng_event_create(enabler->chan, | |
1222 | NULL, NULL, desc, | |
1223 | LTTNG_KERNEL_TRACEPOINT); | |
1224 | if (!event) { | |
1225 | printk(KERN_INFO "Unable to create event %s\n", | |
1226 | probe_desc->event_desc[i]->name); | |
1227 | } | |
1228 | } | |
1229 | } | |
1230 | } | |
1231 | ||
33a39a3c MD |
1232 | static |
1233 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1234 | { | |
1235 | int ret; | |
1236 | ||
1237 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1238 | WARN_ON_ONCE(ret); | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Create struct lttng_event if it is missing and present in the list of | |
1243 | * tracepoint probes. | |
1244 | * Should be called with sessions mutex held. | |
1245 | */ | |
1246 | static | |
1247 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1248 | { | |
1249 | switch (enabler->event_param.instrumentation) { | |
1250 | case LTTNG_KERNEL_TRACEPOINT: | |
1251 | lttng_create_tracepoint_if_missing(enabler); | |
1252 | break; | |
1253 | case LTTNG_KERNEL_SYSCALL: | |
1254 | lttng_create_syscall_if_missing(enabler); | |
1255 | break; | |
1256 | default: | |
1257 | WARN_ON_ONCE(1); | |
1258 | break; | |
1259 | } | |
1260 | } | |
1261 | ||
3c997079 MD |
1262 | /* |
1263 | * Create events associated with an enabler (if not already present), | |
1264 | * and add backward reference from the event to the enabler. | |
1265 | * Should be called with sessions mutex held. | |
1266 | */ | |
1267 | static | |
1268 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1269 | { | |
1270 | struct lttng_session *session = enabler->chan->session; | |
1271 | struct lttng_event *event; | |
1272 | ||
1273 | /* First ensure that probe events are created for this enabler. */ | |
1274 | lttng_create_event_if_missing(enabler); | |
1275 | ||
1276 | /* For each event matching enabler in session event list. */ | |
1277 | list_for_each_entry(event, &session->events, list) { | |
1278 | struct lttng_enabler_ref *enabler_ref; | |
1279 | ||
1280 | if (!lttng_event_match_enabler(event, enabler)) | |
1281 | continue; | |
1282 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1283 | if (!enabler_ref) { | |
1284 | /* | |
1285 | * If no backward ref, create it. | |
1286 | * Add backward ref from event to enabler. | |
1287 | */ | |
1288 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1289 | if (!enabler_ref) | |
1290 | return -ENOMEM; | |
1291 | enabler_ref->ref = enabler; | |
1292 | list_add(&enabler_ref->node, | |
1293 | &event->enablers_ref_head); | |
1294 | } | |
1295 | ||
f127e61e MD |
1296 | /* |
1297 | * Link filter bytecodes if not linked yet. | |
1298 | */ | |
1299 | lttng_enabler_event_link_bytecode(event, enabler); | |
1300 | ||
3c997079 MD |
1301 | /* TODO: merge event context. */ |
1302 | } | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Called at module load: connect the probe on all enablers matching | |
1308 | * this event. | |
1309 | * Called with sessions lock held. | |
1310 | */ | |
1311 | int lttng_fix_pending_events(void) | |
1312 | { | |
1313 | struct lttng_session *session; | |
1314 | ||
1315 | list_for_each_entry(session, &sessions, list) | |
1316 | lttng_session_lazy_sync_enablers(session); | |
1317 | return 0; | |
1318 | } | |
1319 | ||
1320 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1321 | struct lttng_kernel_event *event_param, | |
1322 | struct lttng_channel *chan) | |
1323 | { | |
1324 | struct lttng_enabler *enabler; | |
1325 | ||
1326 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1327 | if (!enabler) | |
1328 | return NULL; | |
1329 | enabler->type = type; | |
07dfc1d0 | 1330 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1331 | memcpy(&enabler->event_param, event_param, |
1332 | sizeof(enabler->event_param)); | |
1333 | enabler->chan = chan; | |
1334 | /* ctx left NULL */ | |
4fd19d8a | 1335 | enabler->enabled = 0; |
3c997079 MD |
1336 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1337 | mutex_lock(&sessions_mutex); | |
1338 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1339 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1340 | mutex_unlock(&sessions_mutex); | |
1341 | return enabler; | |
1342 | } | |
1343 | ||
1344 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1345 | { | |
1346 | mutex_lock(&sessions_mutex); | |
1347 | enabler->enabled = 1; | |
1348 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1349 | mutex_unlock(&sessions_mutex); | |
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1354 | { | |
1355 | mutex_lock(&sessions_mutex); | |
1356 | enabler->enabled = 0; | |
1357 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1358 | mutex_unlock(&sessions_mutex); | |
1359 | return 0; | |
1360 | } | |
1361 | ||
07dfc1d0 MD |
1362 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1363 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1364 | { | |
1365 | struct lttng_filter_bytecode_node *bytecode_node; | |
1366 | uint32_t bytecode_len; | |
1367 | int ret; | |
1368 | ||
1369 | ret = get_user(bytecode_len, &bytecode->len); | |
1370 | if (ret) | |
1371 | return ret; | |
1372 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1373 | GFP_KERNEL); | |
1374 | if (!bytecode_node) | |
1375 | return -ENOMEM; | |
1376 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1377 | sizeof(*bytecode) + bytecode_len); | |
1378 | if (ret) | |
1379 | goto error_free; | |
1380 | bytecode_node->enabler = enabler; | |
1381 | /* Enforce length based on allocated size */ | |
1382 | bytecode_node->bc.len = bytecode_len; | |
1383 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1384 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1385 | return 0; | |
1386 | ||
1387 | error_free: | |
1388 | kfree(bytecode_node); | |
1389 | return ret; | |
1390 | } | |
1391 | ||
3c997079 MD |
1392 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1393 | struct lttng_kernel_context *context_param) | |
1394 | { | |
1395 | return -ENOSYS; | |
1396 | } | |
1397 | ||
1398 | static | |
1399 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1400 | { | |
07dfc1d0 MD |
1401 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1402 | ||
1403 | /* Destroy filter bytecode */ | |
1404 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1405 | &enabler->filter_bytecode_head, node) { | |
1406 | kfree(filter_node); | |
1407 | } | |
1408 | ||
3c997079 MD |
1409 | /* Destroy contexts */ |
1410 | lttng_destroy_context(enabler->ctx); | |
1411 | ||
1412 | list_del(&enabler->node); | |
1413 | kfree(enabler); | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * lttng_session_sync_enablers should be called just before starting a | |
1418 | * session. | |
1419 | * Should be called with sessions mutex held. | |
1420 | */ | |
1421 | static | |
1422 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1423 | { | |
1424 | struct lttng_enabler *enabler; | |
1425 | struct lttng_event *event; | |
1426 | ||
1427 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1428 | lttng_enabler_ref_events(enabler); | |
1429 | /* | |
1430 | * For each event, if at least one of its enablers is enabled, | |
1431 | * and its channel and session transient states are enabled, we | |
1432 | * enable the event, else we disable it. | |
1433 | */ | |
1434 | list_for_each_entry(event, &session->events, list) { | |
1435 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1436 | struct lttng_bytecode_runtime *runtime; |
1437 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1438 | |
4ecb5ad5 MD |
1439 | switch (event->instrumentation) { |
1440 | case LTTNG_KERNEL_TRACEPOINT: | |
1441 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1442 | /* Enable events */ |
1443 | list_for_each_entry(enabler_ref, | |
1444 | &event->enablers_ref_head, node) { | |
1445 | if (enabler_ref->ref->enabled) { | |
1446 | enabled = 1; | |
1447 | break; | |
1448 | } | |
1449 | } | |
4ecb5ad5 MD |
1450 | break; |
1451 | default: | |
3c997079 MD |
1452 | /* Not handled with lazy sync. */ |
1453 | continue; | |
1454 | } | |
1455 | /* | |
1456 | * Enabled state is based on union of enablers, with | |
1457 | * intesection of session and channel transient enable | |
1458 | * states. | |
1459 | */ | |
1460 | enabled = enabled && session->tstate && event->chan->tstate; | |
1461 | ||
1462 | ACCESS_ONCE(event->enabled) = enabled; | |
1463 | /* | |
1464 | * Sync tracepoint registration with event enabled | |
1465 | * state. | |
1466 | */ | |
1467 | if (enabled) { | |
1468 | register_event(event); | |
1469 | } else { | |
1470 | _lttng_event_unregister(event); | |
1471 | } | |
07dfc1d0 MD |
1472 | |
1473 | /* Check if has enablers without bytecode enabled */ | |
1474 | list_for_each_entry(enabler_ref, | |
1475 | &event->enablers_ref_head, node) { | |
1476 | if (enabler_ref->ref->enabled | |
1477 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1478 | has_enablers_without_bytecode = 1; | |
1479 | break; | |
1480 | } | |
1481 | } | |
1482 | event->has_enablers_without_bytecode = | |
1483 | has_enablers_without_bytecode; | |
1484 | ||
1485 | /* Enable filters */ | |
1486 | list_for_each_entry(runtime, | |
f127e61e | 1487 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1488 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1489 | } |
1490 | } | |
1491 | ||
1492 | /* | |
1493 | * Apply enablers to session events, adding events to session if need | |
1494 | * be. It is required after each modification applied to an active | |
1495 | * session, and right before session "start". | |
1496 | * "lazy" sync means we only sync if required. | |
1497 | * Should be called with sessions mutex held. | |
1498 | */ | |
1499 | static | |
1500 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1501 | { | |
1502 | /* We can skip if session is not active */ | |
1503 | if (!session->active) | |
1504 | return; | |
1505 | lttng_session_sync_enablers(session); | |
1506 | } | |
1507 | ||
1ec3f75a | 1508 | /* |
d83004aa JD |
1509 | * Serialize at most one packet worth of metadata into a metadata |
1510 | * channel. | |
92d9f5e6 MD |
1511 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1512 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1513 | * allows us to do racy operations such as looking for remaining space left in | |
1514 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1515 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1516 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1517 | * Returns the number of bytes written in the channel, 0 if no data |
1518 | * was written and a negative value on error. | |
1ec3f75a | 1519 | */ |
b3b8072b MD |
1520 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1521 | struct channel *chan) | |
d83004aa JD |
1522 | { |
1523 | struct lib_ring_buffer_ctx ctx; | |
1524 | int ret = 0; | |
1525 | size_t len, reserve_len; | |
1526 | ||
f613e3e6 | 1527 | /* |
92d9f5e6 MD |
1528 | * Ensure we support mutiple get_next / put sequences followed by |
1529 | * put_next. The metadata cache lock protects reading the metadata | |
1530 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1531 | * "flush" operations on the buffer invoked by different processes. | |
1532 | * Moreover, since the metadata cache memory can be reallocated, we | |
1533 | * need to have exclusive access against updates even though we only | |
1534 | * read it. | |
f613e3e6 | 1535 | */ |
92d9f5e6 | 1536 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1537 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1538 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1539 | goto end; |
f613e3e6 | 1540 | |
d83004aa | 1541 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1542 | stream->metadata_in; |
9de2c215 | 1543 | if (!len) |
de23d59d | 1544 | goto end; |
d83004aa | 1545 | reserve_len = min_t(size_t, |
b3b8072b | 1546 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1547 | len); |
b3b8072b | 1548 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1549 | sizeof(char), -1); |
1550 | /* | |
1551 | * If reservation failed, return an error to the caller. | |
1552 | */ | |
b3b8072b | 1553 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1554 | if (ret != 0) { |
1555 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1556 | goto end; | |
1557 | } | |
b3b8072b | 1558 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1559 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1560 | reserve_len); |
b3b8072b | 1561 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1562 | stream->metadata_in += reserve_len; |
d83004aa JD |
1563 | ret = reserve_len; |
1564 | ||
1565 | end: | |
92d9f5e6 | 1566 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1567 | return ret; |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * Write the metadata to the metadata cache. | |
1572 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1573 | * The metadata cache lock protects us from concurrent read access from |
1574 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1575 | */ |
a90917c3 | 1576 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1577 | const char *fmt, ...) |
1578 | { | |
c099397a | 1579 | char *str; |
d83004aa | 1580 | size_t len; |
c099397a | 1581 | va_list ap; |
d83004aa | 1582 | struct lttng_metadata_stream *stream; |
c099397a MD |
1583 | |
1584 | WARN_ON_ONCE(!ACCESS_ONCE(session->active)); | |
1585 | ||
1586 | va_start(ap, fmt); | |
1587 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1588 | va_end(ap); | |
1589 | if (!str) | |
1590 | return -ENOMEM; | |
1591 | ||
1ec3f75a | 1592 | len = strlen(str); |
92d9f5e6 | 1593 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1594 | if (session->metadata_cache->metadata_written + len > |
1595 | session->metadata_cache->cache_alloc) { | |
1596 | char *tmp_cache_realloc; | |
1597 | unsigned int tmp_cache_alloc_size; | |
1598 | ||
1599 | tmp_cache_alloc_size = max_t(unsigned int, | |
1600 | session->metadata_cache->cache_alloc + len, | |
1601 | session->metadata_cache->cache_alloc << 1); | |
c74b9c6f | 1602 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1603 | if (!tmp_cache_realloc) |
1604 | goto err; | |
a606b6e8 ML |
1605 | if (session->metadata_cache->data) { |
1606 | memcpy(tmp_cache_realloc, | |
1607 | session->metadata_cache->data, | |
1608 | session->metadata_cache->cache_alloc); | |
1609 | vfree(session->metadata_cache->data); | |
1610 | } | |
1611 | ||
d83004aa JD |
1612 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1613 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1614 | } |
d83004aa JD |
1615 | memcpy(session->metadata_cache->data + |
1616 | session->metadata_cache->metadata_written, | |
1617 | str, len); | |
1618 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1619 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1620 | kfree(str); |
d83004aa JD |
1621 | |
1622 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1623 | wake_up_interruptible(&stream->read_wait); | |
1624 | ||
1625 | return 0; | |
1626 | ||
1627 | err: | |
92d9f5e6 | 1628 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1629 | kfree(str); |
1630 | return -ENOMEM; | |
c099397a MD |
1631 | } |
1632 | ||
d83004aa JD |
1633 | /* |
1634 | * Must be called with sessions_mutex held. | |
1635 | */ | |
c099397a | 1636 | static |
a90917c3 | 1637 | int _lttng_field_statedump(struct lttng_session *session, |
8070f5c0 | 1638 | const struct lttng_event_field *field) |
c099397a | 1639 | { |
c099397a | 1640 | int ret = 0; |
c099397a | 1641 | |
8070f5c0 MD |
1642 | switch (field->type.atype) { |
1643 | case atype_integer: | |
1644 | ret = lttng_metadata_printf(session, | |
244465ab | 1645 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
1646 | field->type.u.basic.integer.size, |
1647 | field->type.u.basic.integer.alignment, | |
1648 | field->type.u.basic.integer.signedness, | |
1649 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
1650 | ? "none" | |
1651 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
1652 | ? "UTF8" | |
1653 | : "ASCII", | |
1654 | field->type.u.basic.integer.base, | |
9928f844 | 1655 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1656 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 1657 | #else |
8070f5c0 | 1658 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 1659 | #endif |
8070f5c0 MD |
1660 | field->name); |
1661 | break; | |
1662 | case atype_enum: | |
1663 | ret = lttng_metadata_printf(session, | |
244465ab | 1664 | " %s _%s;\n", |
8070f5c0 MD |
1665 | field->type.u.basic.enumeration.name, |
1666 | field->name); | |
1667 | break; | |
1668 | case atype_array: | |
1669 | { | |
1670 | const struct lttng_basic_type *elem_type; | |
1671 | ||
1672 | elem_type = &field->type.u.array.elem_type; | |
1673 | ret = lttng_metadata_printf(session, | |
244465ab | 1674 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
1675 | elem_type->u.basic.integer.size, |
1676 | elem_type->u.basic.integer.alignment, | |
1677 | elem_type->u.basic.integer.signedness, | |
1678 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1679 | ? "none" | |
1680 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
1681 | ? "UTF8" | |
1682 | : "ASCII", | |
1683 | elem_type->u.basic.integer.base, | |
9928f844 | 1684 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1685 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1686 | #else |
8070f5c0 | 1687 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1688 | #endif |
8070f5c0 MD |
1689 | field->name, field->type.u.array.length); |
1690 | break; | |
1691 | } | |
1692 | case atype_sequence: | |
1693 | { | |
1694 | const struct lttng_basic_type *elem_type; | |
1695 | const struct lttng_basic_type *length_type; | |
1696 | ||
1697 | elem_type = &field->type.u.sequence.elem_type; | |
1698 | length_type = &field->type.u.sequence.length_type; | |
1699 | ret = lttng_metadata_printf(session, | |
1700 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
8070f5c0 | 1701 | length_type->u.basic.integer.size, |
32257272 | 1702 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
1703 | length_type->u.basic.integer.signedness, |
1704 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
1705 | ? "none" | |
0635cdd4 | 1706 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1707 | ? "UTF8" |
0635cdd4 | 1708 | : "ASCII"), |
8070f5c0 | 1709 | length_type->u.basic.integer.base, |
9928f844 | 1710 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1711 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 1712 | #else |
0635cdd4 | 1713 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 1714 | #endif |
27d2368e MD |
1715 | field->name); |
1716 | if (ret) | |
1717 | return ret; | |
1718 | ||
1719 | ret = lttng_metadata_printf(session, | |
244465ab | 1720 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 1721 | elem_type->u.basic.integer.size, |
32257272 | 1722 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
1723 | elem_type->u.basic.integer.signedness, |
1724 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
1725 | ? "none" | |
0635cdd4 | 1726 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 1727 | ? "UTF8" |
0635cdd4 | 1728 | : "ASCII"), |
8070f5c0 | 1729 | elem_type->u.basic.integer.base, |
9928f844 | 1730 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 1731 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 1732 | #else |
8070f5c0 | 1733 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 1734 | #endif |
8070f5c0 | 1735 | field->name, |
27d2368e | 1736 | field->name); |
8070f5c0 MD |
1737 | break; |
1738 | } | |
c099397a | 1739 | |
8070f5c0 MD |
1740 | case atype_string: |
1741 | /* Default encoding is UTF8 */ | |
1742 | ret = lttng_metadata_printf(session, | |
244465ab | 1743 | " string%s _%s;\n", |
8070f5c0 MD |
1744 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
1745 | " { encoding = ASCII; }" : "", | |
1746 | field->name); | |
1747 | break; | |
1748 | default: | |
1749 | WARN_ON_ONCE(1); | |
1750 | return -EINVAL; | |
1751 | } | |
1752 | return ret; | |
1753 | } | |
1754 | ||
1755 | static | |
a90917c3 | 1756 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
1757 | struct lttng_ctx *ctx) |
1758 | { | |
1759 | int ret = 0; | |
1760 | int i; | |
1761 | ||
1762 | if (!ctx) | |
1763 | return 0; | |
1764 | for (i = 0; i < ctx->nr_fields; i++) { | |
1765 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
1766 | ||
a90917c3 | 1767 | ret = _lttng_field_statedump(session, &field->event_field); |
8070f5c0 MD |
1768 | if (ret) |
1769 | return ret; | |
1770 | } | |
1771 | return ret; | |
1772 | } | |
1773 | ||
1774 | static | |
a90917c3 MD |
1775 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
1776 | struct lttng_event *event) | |
8070f5c0 MD |
1777 | { |
1778 | const struct lttng_event_desc *desc = event->desc; | |
1779 | int ret = 0; | |
1780 | int i; | |
1781 | ||
1782 | for (i = 0; i < desc->nr_fields; i++) { | |
1783 | const struct lttng_event_field *field = &desc->fields[i]; | |
1784 | ||
a90917c3 | 1785 | ret = _lttng_field_statedump(session, field); |
8070f5c0 MD |
1786 | if (ret) |
1787 | return ret; | |
c099397a MD |
1788 | } |
1789 | return ret; | |
1790 | } | |
1791 | ||
d83004aa JD |
1792 | /* |
1793 | * Must be called with sessions_mutex held. | |
1794 | */ | |
c099397a | 1795 | static |
a90917c3 MD |
1796 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
1797 | struct lttng_channel *chan, | |
1798 | struct lttng_event *event) | |
c099397a MD |
1799 | { |
1800 | int ret = 0; | |
1801 | ||
1802 | if (event->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1803 | return 0; | |
d83004aa | 1804 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
1805 | return 0; |
1806 | ||
1807 | ret = lttng_metadata_printf(session, | |
1808 | "event {\n" | |
ae734547 | 1809 | " name = \"%s\";\n" |
c099397a | 1810 | " id = %u;\n" |
b9074a1b | 1811 | " stream_id = %u;\n", |
c099397a MD |
1812 | event->desc->name, |
1813 | event->id, | |
1814 | event->chan->id); | |
1815 | if (ret) | |
1816 | goto end; | |
1817 | ||
b9074a1b MD |
1818 | if (event->ctx) { |
1819 | ret = lttng_metadata_printf(session, | |
1820 | " context := struct {\n"); | |
1821 | if (ret) | |
1822 | goto end; | |
1823 | } | |
a90917c3 | 1824 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
1825 | if (ret) |
1826 | goto end; | |
b9074a1b MD |
1827 | if (event->ctx) { |
1828 | ret = lttng_metadata_printf(session, | |
1829 | " };\n"); | |
1830 | if (ret) | |
1831 | goto end; | |
1832 | } | |
8070f5c0 MD |
1833 | |
1834 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
1835 | " fields := struct {\n" |
1836 | ); | |
1837 | if (ret) | |
1838 | goto end; | |
1839 | ||
a90917c3 | 1840 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
1841 | if (ret) |
1842 | goto end; | |
1843 | ||
1844 | /* | |
1845 | * LTTng space reservation can only reserve multiples of the | |
1846 | * byte size. | |
1847 | */ | |
1848 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
1849 | " };\n" |
1850 | "};\n\n"); | |
c099397a MD |
1851 | if (ret) |
1852 | goto end; | |
1853 | ||
c099397a MD |
1854 | event->metadata_dumped = 1; |
1855 | end: | |
1856 | return ret; | |
1857 | ||
1858 | } | |
1859 | ||
d83004aa JD |
1860 | /* |
1861 | * Must be called with sessions_mutex held. | |
1862 | */ | |
c099397a | 1863 | static |
a90917c3 MD |
1864 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
1865 | struct lttng_channel *chan) | |
c099397a MD |
1866 | { |
1867 | int ret = 0; | |
1868 | ||
1869 | if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) | |
1870 | return 0; | |
d83004aa JD |
1871 | |
1872 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
1873 | return 0; |
1874 | ||
1875 | WARN_ON_ONCE(!chan->header_type); | |
1876 | ret = lttng_metadata_printf(session, | |
1877 | "stream {\n" | |
1878 | " id = %u;\n" | |
9115fbdc | 1879 | " event.header := %s;\n" |
b9074a1b | 1880 | " packet.context := struct packet_context;\n", |
c099397a MD |
1881 | chan->id, |
1882 | chan->header_type == 1 ? "struct event_header_compact" : | |
1883 | "struct event_header_large"); | |
1884 | if (ret) | |
1885 | goto end; | |
1886 | ||
b9074a1b MD |
1887 | if (chan->ctx) { |
1888 | ret = lttng_metadata_printf(session, | |
1889 | " event.context := struct {\n"); | |
1890 | if (ret) | |
1891 | goto end; | |
1892 | } | |
a90917c3 | 1893 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
1894 | if (ret) |
1895 | goto end; | |
b9074a1b MD |
1896 | if (chan->ctx) { |
1897 | ret = lttng_metadata_printf(session, | |
1898 | " };\n"); | |
1899 | if (ret) | |
1900 | goto end; | |
1901 | } | |
8070f5c0 MD |
1902 | |
1903 | ret = lttng_metadata_printf(session, | |
b9074a1b | 1904 | "};\n\n"); |
8070f5c0 | 1905 | |
c099397a MD |
1906 | chan->metadata_dumped = 1; |
1907 | end: | |
1908 | return ret; | |
1909 | } | |
1910 | ||
d83004aa JD |
1911 | /* |
1912 | * Must be called with sessions_mutex held. | |
1913 | */ | |
9115fbdc | 1914 | static |
a90917c3 | 1915 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
1916 | { |
1917 | return lttng_metadata_printf(session, | |
1918 | "struct packet_context {\n" | |
a3ccff4f MD |
1919 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1920 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
1921 | " uint64_t content_size;\n" |
1922 | " uint64_t packet_size;\n" | |
a9afe705 | 1923 | " unsigned long events_discarded;\n" |
9115fbdc | 1924 | " uint32_t cpu_id;\n" |
c6dfdf6f | 1925 | "};\n\n" |
9115fbdc MD |
1926 | ); |
1927 | } | |
1928 | ||
1929 | /* | |
1930 | * Compact header: | |
1931 | * id: range: 0 - 30. | |
1932 | * id 31 is reserved to indicate an extended header. | |
1933 | * | |
1934 | * Large header: | |
1935 | * id: range: 0 - 65534. | |
1936 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
1937 | * |
1938 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
1939 | */ |
1940 | static | |
a90917c3 | 1941 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
1942 | { |
1943 | return lttng_metadata_printf(session, | |
1944 | "struct event_header_compact {\n" | |
1945 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1946 | " variant <id> {\n" | |
1947 | " struct {\n" | |
a3ccff4f | 1948 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1949 | " } compact;\n" |
1950 | " struct {\n" | |
1951 | " uint32_t id;\n" | |
a3ccff4f | 1952 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1953 | " } extended;\n" |
1954 | " } v;\n" | |
1955 | "} align(%u);\n" | |
1956 | "\n" | |
1957 | "struct event_header_large {\n" | |
1958 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1959 | " variant <id> {\n" | |
1960 | " struct {\n" | |
a3ccff4f | 1961 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1962 | " } compact;\n" |
1963 | " struct {\n" | |
1964 | " uint32_t id;\n" | |
a3ccff4f | 1965 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
1966 | " } extended;\n" |
1967 | " } v;\n" | |
1968 | "} align(%u);\n\n", | |
a90917c3 MD |
1969 | lttng_alignof(uint32_t) * CHAR_BIT, |
1970 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
1971 | ); |
1972 | } | |
1973 | ||
a3ccff4f MD |
1974 | /* |
1975 | * Approximation of NTP time of day to clock monotonic correlation, | |
1976 | * taken at start of trace. | |
1977 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1978 | * in future versions. | |
2b644192 MD |
1979 | * Return 0 if offset is negative. It may happen if the system sets |
1980 | * the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
1981 | */ |
1982 | static | |
1983 | uint64_t measure_clock_offset(void) | |
1984 | { | |
2b644192 MD |
1985 | uint64_t monotonic_avg, monotonic[2], realtime; |
1986 | int64_t offset; | |
a3ccff4f MD |
1987 | struct timespec rts = { 0, 0 }; |
1988 | unsigned long flags; | |
1989 | ||
1990 | /* Disable interrupts to increase correlation precision. */ | |
1991 | local_irq_save(flags); | |
1992 | monotonic[0] = trace_clock_read64(); | |
1993 | getnstimeofday(&rts); | |
1994 | monotonic[1] = trace_clock_read64(); | |
1995 | local_irq_restore(flags); | |
1996 | ||
2b644192 | 1997 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
57be518d | 1998 | realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; |
a3ccff4f | 1999 | realtime += rts.tv_nsec; |
2b644192 MD |
2000 | offset = (int64_t) realtime - monotonic_avg; |
2001 | if (offset < 0) | |
2002 | return 0; | |
a3ccff4f MD |
2003 | return offset; |
2004 | } | |
2005 | ||
c099397a MD |
2006 | /* |
2007 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2008 | * Must be called with sessions_mutex held. |
c099397a MD |
2009 | */ |
2010 | static | |
a90917c3 | 2011 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2012 | { |
30bdb6e4 | 2013 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2014 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2015 | struct lttng_channel *chan; |
2016 | struct lttng_event *event; | |
c099397a MD |
2017 | int ret = 0; |
2018 | ||
2019 | if (!ACCESS_ONCE(session->active)) | |
2020 | return 0; | |
2021 | if (session->metadata_dumped) | |
2022 | goto skip_session; | |
c099397a | 2023 | |
d793d5e1 | 2024 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2025 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2026 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2027 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2028 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2029 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2030 | |
2031 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2032 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2033 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2034 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2035 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2036 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2037 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2038 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2039 | "\n" |
2040 | "trace {\n" | |
2041 | " major = %u;\n" | |
2042 | " minor = %u;\n" | |
30bdb6e4 | 2043 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2044 | " byte_order = %s;\n" |
2045 | " packet.header := struct {\n" | |
2046 | " uint32_t magic;\n" | |
1ec3f75a | 2047 | " uint8_t uuid[16];\n" |
d793d5e1 | 2048 | " uint32_t stream_id;\n" |
0eb25f58 | 2049 | " };\n" |
d793d5e1 | 2050 | "};\n\n", |
a90917c3 MD |
2051 | lttng_alignof(uint8_t) * CHAR_BIT, |
2052 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2053 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2054 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2055 | sizeof(unsigned long) * CHAR_BIT, |
2056 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2057 | CTF_SPEC_MAJOR, |
2058 | CTF_SPEC_MINOR, | |
d793d5e1 | 2059 | uuid_s, |
9928f844 | 2060 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2061 | "be" |
2062 | #else | |
2063 | "le" | |
2064 | #endif | |
2065 | ); | |
2066 | if (ret) | |
2067 | goto end; | |
2068 | ||
99dc9597 MD |
2069 | ret = lttng_metadata_printf(session, |
2070 | "env {\n" | |
a6058143 | 2071 | " hostname = \"%s\";\n" |
c6c9e10f | 2072 | " domain = \"kernel\";\n" |
99dc9597 | 2073 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2074 | " kernel_release = \"%s\";\n" |
2075 | " kernel_version = \"%s\";\n" | |
2076 | " tracer_name = \"lttng-modules\";\n" | |
2077 | " tracer_major = %d;\n" | |
2078 | " tracer_minor = %d;\n" | |
2079 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2080 | "};\n\n", |
3d0d43db | 2081 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2082 | utsname()->sysname, |
2083 | utsname()->release, | |
c6c9e10f MD |
2084 | utsname()->version, |
2085 | LTTNG_MODULES_MAJOR_VERSION, | |
2086 | LTTNG_MODULES_MINOR_VERSION, | |
2087 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2088 | ); |
2089 | if (ret) | |
2090 | goto end; | |
2091 | ||
a3ccff4f MD |
2092 | ret = lttng_metadata_printf(session, |
2093 | "clock {\n" | |
a82c63f1 MD |
2094 | " name = %s;\n", |
2095 | "monotonic" | |
2096 | ); | |
2097 | if (ret) | |
2098 | goto end; | |
2099 | ||
2100 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2101 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2102 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2103 | clock_uuid_s |
2104 | ); | |
2105 | if (ret) | |
2106 | goto end; | |
2107 | } | |
2108 | ||
2109 | ret = lttng_metadata_printf(session, | |
a3ccff4f MD |
2110 | " description = \"Monotonic Clock\";\n" |
2111 | " freq = %llu; /* Frequency, in Hz */\n" | |
2112 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
2113 | " offset = %llu;\n" | |
2114 | "};\n\n", | |
a3ccff4f MD |
2115 | (unsigned long long) trace_clock_freq(), |
2116 | (unsigned long long) measure_clock_offset() | |
2117 | ); | |
2118 | if (ret) | |
2119 | goto end; | |
2120 | ||
2121 | ret = lttng_metadata_printf(session, | |
2122 | "typealias integer {\n" | |
2123 | " size = 27; align = 1; signed = false;\n" | |
2124 | " map = clock.monotonic.value;\n" | |
2125 | "} := uint27_clock_monotonic_t;\n" | |
2126 | "\n" | |
2127 | "typealias integer {\n" | |
2128 | " size = 32; align = %u; signed = false;\n" | |
2129 | " map = clock.monotonic.value;\n" | |
2130 | "} := uint32_clock_monotonic_t;\n" | |
2131 | "\n" | |
2132 | "typealias integer {\n" | |
2133 | " size = 64; align = %u; signed = false;\n" | |
2134 | " map = clock.monotonic.value;\n" | |
2135 | "} := uint64_clock_monotonic_t;\n\n", | |
2136 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2137 | lttng_alignof(uint64_t) * CHAR_BIT | |
2138 | ); | |
2139 | if (ret) | |
2140 | goto end; | |
2141 | ||
a90917c3 | 2142 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2143 | if (ret) |
2144 | goto end; | |
2145 | ||
a90917c3 | 2146 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2147 | if (ret) |
2148 | goto end; | |
2149 | ||
c099397a MD |
2150 | skip_session: |
2151 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2152 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2153 | if (ret) |
2154 | goto end; | |
2155 | } | |
2156 | ||
2157 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2158 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2159 | if (ret) |
2160 | goto end; | |
2161 | } | |
2162 | session->metadata_dumped = 1; | |
2163 | end: | |
2164 | return ret; | |
2165 | } | |
2166 | ||
c0e31d2e | 2167 | /** |
a90917c3 | 2168 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2169 | * @transport: transport structure |
2170 | * | |
2171 | * Registers a transport which can be used as output to extract the data out of | |
2172 | * LTTng. The module calling this registration function must ensure that no | |
2173 | * trap-inducing code will be executed by the transport functions. E.g. | |
2174 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2175 | * is made visible to the transport function. This registration acts as a | |
2176 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2177 | * after its registration must it synchronize the TLBs. | |
2178 | */ | |
a90917c3 | 2179 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2180 | { |
2181 | /* | |
2182 | * Make sure no page fault can be triggered by the module about to be | |
2183 | * registered. We deal with this here so we don't have to call | |
2184 | * vmalloc_sync_all() in each module's init. | |
2185 | */ | |
6d2a620c | 2186 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2187 | |
2188 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2189 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2190 | mutex_unlock(&sessions_mutex); |
2191 | } | |
a90917c3 | 2192 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2193 | |
2194 | /** | |
a90917c3 | 2195 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2196 | * @transport: transport structure |
2197 | */ | |
a90917c3 | 2198 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2199 | { |
2200 | mutex_lock(&sessions_mutex); | |
2201 | list_del(&transport->node); | |
2202 | mutex_unlock(&sessions_mutex); | |
2203 | } | |
a90917c3 | 2204 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2205 | |
a90917c3 | 2206 | static int __init lttng_events_init(void) |
4e3c1b9b | 2207 | { |
1c25284c MD |
2208 | int ret; |
2209 | ||
453b2495 JD |
2210 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2211 | if (ret) | |
2212 | return ret; | |
389d7070 | 2213 | ret = wrapper_get_pfnblock_flags_mask_init(); |
70795b22 MD |
2214 | if (ret) |
2215 | return ret; | |
2216 | ret = wrapper_get_pageblock_flags_mask_init(); | |
389d7070 MD |
2217 | if (ret) |
2218 | return ret; | |
07dfc1d0 | 2219 | ret = lttng_context_init(); |
20591cf7 MD |
2220 | if (ret) |
2221 | return ret; | |
07dfc1d0 MD |
2222 | ret = lttng_tracepoint_init(); |
2223 | if (ret) | |
2224 | goto error_tp; | |
a90917c3 | 2225 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2226 | if (!event_cache) { |
2227 | ret = -ENOMEM; | |
2228 | goto error_kmem; | |
2229 | } | |
80996790 | 2230 | ret = lttng_abi_init(); |
02119ee5 MD |
2231 | if (ret) |
2232 | goto error_abi; | |
0c956676 MD |
2233 | ret = lttng_logger_init(); |
2234 | if (ret) | |
2235 | goto error_logger; | |
4e3c1b9b | 2236 | return 0; |
0c956676 MD |
2237 | |
2238 | error_logger: | |
2239 | lttng_abi_exit(); | |
02119ee5 | 2240 | error_abi: |
1c25284c | 2241 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2242 | error_kmem: |
2243 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2244 | error_tp: |
2245 | lttng_context_exit(); | |
1c25284c | 2246 | return ret; |
4e3c1b9b MD |
2247 | } |
2248 | ||
a90917c3 | 2249 | module_init(lttng_events_init); |
11b5a3c2 | 2250 | |
a90917c3 | 2251 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2252 | { |
a90917c3 | 2253 | struct lttng_session *session, *tmpsession; |
92e94819 | 2254 | |
0c956676 | 2255 | lttng_logger_exit(); |
80996790 | 2256 | lttng_abi_exit(); |
92e94819 | 2257 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2258 | lttng_session_destroy(session); |
11b5a3c2 | 2259 | kmem_cache_destroy(event_cache); |
20591cf7 | 2260 | lttng_tracepoint_exit(); |
07dfc1d0 | 2261 | lttng_context_exit(); |
4e3c1b9b | 2262 | } |
92e94819 | 2263 | |
a90917c3 | 2264 | module_exit(lttng_events_exit); |
11b5a3c2 | 2265 | |
92e94819 MD |
2266 | MODULE_LICENSE("GPL and additional rights"); |
2267 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
2268 | MODULE_DESCRIPTION("LTTng Events"); | |
9a9973ef MD |
2269 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2270 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2271 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2272 | LTTNG_MODULES_EXTRAVERSION); |