Commit | Line | Data |
---|---|---|
b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
39 | #include <lttng/tracer.h> | |
40 | #include <lttng/abi-old.h> | |
41 | #include <lttng/endian.h> | |
42 | #include <lttng/string-utils.h> | |
4a11ef1c | 43 | #include <lttng/utils.h> |
24591303 MD |
44 | #include <ringbuffer/backend.h> |
45 | #include <ringbuffer/frontend.h> | |
3636085f | 46 | #include <wrapper/time.h> |
4e3c1b9b | 47 | |
d83004aa JD |
48 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
49 | ||
4e3c1b9b | 50 | static LIST_HEAD(sessions); |
750b05f2 | 51 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 52 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
53 | /* |
54 | * Protect the sessions and metadata caches. | |
55 | */ | |
4e3c1b9b MD |
56 | static DEFINE_MUTEX(sessions_mutex); |
57 | static struct kmem_cache *event_cache; | |
58 | ||
b2bc0bc8 FD |
59 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
60 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
61 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
3c997079 | 62 | |
a90917c3 MD |
63 | static void _lttng_event_destroy(struct lttng_event *event); |
64 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
65 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 66 | static |
a90917c3 MD |
67 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
68 | struct lttng_channel *chan, | |
69 | struct lttng_event *event); | |
c099397a | 70 | static |
a90917c3 | 71 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
72 | static |
73 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 74 | static |
ceabb767 MD |
75 | int _lttng_type_statedump(struct lttng_session *session, |
76 | const struct lttng_type *type, | |
77 | size_t nesting); | |
78 | static | |
f513b2bf MD |
79 | int _lttng_field_statedump(struct lttng_session *session, |
80 | const struct lttng_event_field *field, | |
81 | size_t nesting); | |
c099397a | 82 | |
c099397a | 83 | void synchronize_trace(void) |
abcca994 | 84 | { |
92da05ce MJ |
85 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
86 | synchronize_rcu(); | |
87 | #else | |
abcca994 | 88 | synchronize_sched(); |
92da05ce MJ |
89 | #endif |
90 | ||
b8590f40 MD |
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
92 | #ifdef CONFIG_PREEMPT_RT_FULL | |
93 | synchronize_rcu(); | |
94 | #endif | |
95 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
96 | #ifdef CONFIG_PREEMPT_RT |
97 | synchronize_rcu(); | |
98 | #endif | |
b8590f40 | 99 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
100 | } |
101 | ||
3c997079 MD |
102 | void lttng_lock_sessions(void) |
103 | { | |
104 | mutex_lock(&sessions_mutex); | |
105 | } | |
106 | ||
107 | void lttng_unlock_sessions(void) | |
108 | { | |
109 | mutex_unlock(&sessions_mutex); | |
110 | } | |
111 | ||
9fe593d2 FD |
112 | static struct lttng_transport *lttng_transport_find(const char *name) |
113 | { | |
114 | struct lttng_transport *transport; | |
115 | ||
116 | list_for_each_entry(transport, <tng_transport_list, node) { | |
117 | if (!strcmp(transport->name, name)) | |
118 | return transport; | |
119 | } | |
120 | return NULL; | |
121 | } | |
122 | ||
3c997079 MD |
123 | /* |
124 | * Called with sessions lock held. | |
125 | */ | |
126 | int lttng_session_active(void) | |
127 | { | |
128 | struct lttng_session *iter; | |
129 | ||
130 | list_for_each_entry(iter, &sessions, list) { | |
131 | if (iter->active) | |
132 | return 1; | |
133 | } | |
134 | return 0; | |
135 | } | |
136 | ||
a90917c3 | 137 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 138 | { |
a90917c3 | 139 | struct lttng_session *session; |
d83004aa | 140 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 141 | int i; |
4e3c1b9b MD |
142 | |
143 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 144 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 145 | if (!session) |
d83004aa | 146 | goto err; |
4e3c1b9b | 147 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 148 | INIT_LIST_HEAD(&session->events); |
a7008254 | 149 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
150 | |
151 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
152 | GFP_KERNEL); | |
153 | if (!metadata_cache) | |
154 | goto err_free_session; | |
0ca42eb7 | 155 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
156 | if (!metadata_cache->data) |
157 | goto err_free_cache; | |
158 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
159 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 160 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
161 | session->metadata_cache = metadata_cache; |
162 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
163 | memcpy(&metadata_cache->uuid, &session->uuid, |
164 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
165 | INIT_LIST_HEAD(&session->enablers_head); |
166 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
167 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 168 | list_add(&session->list, &sessions); |
d1f652f8 MD |
169 | session->pid_tracker.session = session; |
170 | session->pid_tracker.tracker_type = TRACKER_PID; | |
171 | session->vpid_tracker.session = session; | |
172 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
173 | session->uid_tracker.session = session; | |
174 | session->uid_tracker.tracker_type = TRACKER_UID; | |
175 | session->vuid_tracker.session = session; | |
176 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
177 | session->gid_tracker.session = session; | |
178 | session->gid_tracker.tracker_type = TRACKER_GID; | |
179 | session->vgid_tracker.session = session; | |
180 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
181 | mutex_unlock(&sessions_mutex); |
182 | return session; | |
d83004aa JD |
183 | |
184 | err_free_cache: | |
185 | kfree(metadata_cache); | |
186 | err_free_session: | |
48f5e0b5 | 187 | lttng_kvfree(session); |
d83004aa JD |
188 | err: |
189 | mutex_unlock(&sessions_mutex); | |
190 | return NULL; | |
191 | } | |
192 | ||
750b05f2 FD |
193 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
194 | { | |
195 | struct lttng_transport *transport = NULL; | |
196 | struct lttng_event_notifier_group *event_notifier_group; | |
197 | const char *transport_name = "relay-event-notifier"; | |
198 | size_t subbuf_size = 4096; //TODO | |
199 | size_t num_subbuf = 16; //TODO | |
200 | unsigned int switch_timer_interval = 0; | |
201 | unsigned int read_timer_interval = 0; | |
202 | ||
203 | mutex_lock(&sessions_mutex); | |
204 | ||
205 | transport = lttng_transport_find(transport_name); | |
206 | if (!transport) { | |
207 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
208 | transport_name); | |
209 | goto notransport; | |
210 | } | |
211 | if (!try_module_get(transport->owner)) { | |
212 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
213 | transport_name); | |
214 | goto notransport; | |
215 | } | |
216 | ||
217 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
218 | GFP_KERNEL); | |
219 | if (!event_notifier_group) | |
220 | goto nomem; | |
221 | ||
222 | /* | |
223 | * Initialize the ring buffer used to store event notifier | |
224 | * notifications. | |
225 | */ | |
226 | event_notifier_group->ops = &transport->ops; | |
227 | event_notifier_group->chan = transport->ops.channel_create( | |
228 | transport_name, event_notifier_group, NULL, | |
229 | subbuf_size, num_subbuf, switch_timer_interval, | |
230 | read_timer_interval); | |
231 | if (!event_notifier_group->chan) | |
232 | goto create_error; | |
233 | ||
234 | event_notifier_group->transport = transport; | |
235 | list_add(&event_notifier_group->node, &event_notifier_groups); | |
236 | ||
237 | mutex_unlock(&sessions_mutex); | |
238 | ||
239 | return event_notifier_group; | |
240 | ||
241 | create_error: | |
242 | lttng_kvfree(event_notifier_group); | |
243 | nomem: | |
244 | if (transport) | |
245 | module_put(transport->owner); | |
246 | notransport: | |
247 | mutex_unlock(&sessions_mutex); | |
248 | return NULL; | |
249 | } | |
250 | ||
d83004aa JD |
251 | void metadata_cache_destroy(struct kref *kref) |
252 | { | |
253 | struct lttng_metadata_cache *cache = | |
254 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 255 | vfree(cache->data); |
d83004aa | 256 | kfree(cache); |
4e3c1b9b MD |
257 | } |
258 | ||
a90917c3 | 259 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 260 | { |
a90917c3 MD |
261 | struct lttng_channel *chan, *tmpchan; |
262 | struct lttng_event *event, *tmpevent; | |
d83004aa | 263 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 264 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 265 | int ret; |
4e3c1b9b MD |
266 | |
267 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 268 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
269 | list_for_each_entry(chan, &session->chan, list) { |
270 | ret = lttng_syscalls_unregister(chan); | |
271 | WARN_ON(ret); | |
272 | } | |
dda6a249 | 273 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 274 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
275 | WARN_ON(ret); |
276 | } | |
abcca994 | 277 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 MD |
278 | list_for_each_entry(chan, &session->chan, list) { |
279 | ret = lttng_syscalls_destroy(chan); | |
280 | WARN_ON(ret); | |
281 | } | |
b2bc0bc8 | 282 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 283 | &session->enablers_head, node) |
b2bc0bc8 | 284 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 285 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 286 | _lttng_event_destroy(event); |
d83004aa JD |
287 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
288 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 289 | _lttng_channel_destroy(chan); |
d83004aa | 290 | } |
ab036a63 | 291 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
292 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
293 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 294 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
295 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
296 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
297 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
298 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
299 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
300 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 301 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
302 | list_del(&session->list); |
303 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 304 | lttng_kvfree(session); |
4e3c1b9b MD |
305 | } |
306 | ||
750b05f2 FD |
307 | void lttng_event_notifier_group_destroy(struct lttng_event_notifier_group *event_notifier_group) |
308 | { | |
309 | if (!event_notifier_group) | |
310 | return; | |
311 | ||
312 | mutex_lock(&sessions_mutex); | |
313 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); | |
314 | module_put(event_notifier_group->transport->owner); | |
315 | list_del(&event_notifier_group->node); | |
316 | mutex_unlock(&sessions_mutex); | |
317 | lttng_kvfree(event_notifier_group); | |
318 | } | |
319 | ||
601252cf MD |
320 | int lttng_session_statedump(struct lttng_session *session) |
321 | { | |
322 | int ret; | |
323 | ||
324 | mutex_lock(&sessions_mutex); | |
325 | ret = lttng_statedump_start(session); | |
326 | mutex_unlock(&sessions_mutex); | |
327 | return ret; | |
328 | } | |
329 | ||
a90917c3 | 330 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
331 | { |
332 | int ret = 0; | |
a90917c3 | 333 | struct lttng_channel *chan; |
c0e31d2e MD |
334 | |
335 | mutex_lock(&sessions_mutex); | |
336 | if (session->active) { | |
337 | ret = -EBUSY; | |
338 | goto end; | |
339 | } | |
c099397a | 340 | |
3c997079 MD |
341 | /* Set transient enabler state to "enabled" */ |
342 | session->tstate = 1; | |
343 | ||
4ef81e4a | 344 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 345 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 346 | |
c099397a MD |
347 | /* |
348 | * Snapshot the number of events per channel to know the type of header | |
349 | * we need to use. | |
350 | */ | |
351 | list_for_each_entry(chan, &session->chan, list) { | |
352 | if (chan->header_type) | |
353 | continue; /* don't change it if session stop/restart */ | |
354 | if (chan->free_event_id < 31) | |
355 | chan->header_type = 1; /* compact */ | |
356 | else | |
357 | chan->header_type = 2; /* large */ | |
358 | } | |
359 | ||
64af2437 | 360 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
361 | list_for_each_entry(chan, &session->chan, list) { |
362 | if (chan->channel_type != METADATA_CHANNEL) | |
363 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
364 | } | |
64af2437 | 365 | |
a8f2d0c7 MJ |
366 | WRITE_ONCE(session->active, 1); |
367 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 368 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 369 | if (ret) { |
a8f2d0c7 | 370 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
371 | goto end; |
372 | } | |
373 | ret = lttng_statedump_start(session); | |
360f38ea | 374 | if (ret) |
a8f2d0c7 | 375 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
376 | end: |
377 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 378 | return ret; |
c0e31d2e MD |
379 | } |
380 | ||
a90917c3 | 381 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
382 | { |
383 | int ret = 0; | |
64af2437 | 384 | struct lttng_channel *chan; |
c0e31d2e MD |
385 | |
386 | mutex_lock(&sessions_mutex); | |
387 | if (!session->active) { | |
388 | ret = -EBUSY; | |
389 | goto end; | |
390 | } | |
a8f2d0c7 | 391 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
392 | |
393 | /* Set transient enabler state to "disabled" */ | |
394 | session->tstate = 0; | |
b2bc0bc8 | 395 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
396 | |
397 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
398 | list_for_each_entry(chan, &session->chan, list) { |
399 | if (chan->channel_type != METADATA_CHANNEL) | |
400 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
401 | } | |
c0e31d2e MD |
402 | end: |
403 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 404 | return ret; |
c0e31d2e MD |
405 | } |
406 | ||
9616f0bf JD |
407 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
408 | { | |
409 | int ret = 0; | |
410 | struct lttng_channel *chan; | |
411 | struct lttng_event *event; | |
412 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
413 | struct lttng_metadata_stream *stream; | |
414 | ||
415 | mutex_lock(&sessions_mutex); | |
416 | if (!session->active) { | |
417 | ret = -EBUSY; | |
418 | goto end; | |
419 | } | |
420 | ||
421 | mutex_lock(&cache->lock); | |
422 | memset(cache->data, 0, cache->cache_alloc); | |
423 | cache->metadata_written = 0; | |
424 | cache->version++; | |
425 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
426 | stream->metadata_out = 0; | |
427 | stream->metadata_in = 0; | |
428 | } | |
429 | mutex_unlock(&cache->lock); | |
430 | ||
431 | session->metadata_dumped = 0; | |
432 | list_for_each_entry(chan, &session->chan, list) { | |
433 | chan->metadata_dumped = 0; | |
434 | } | |
435 | ||
436 | list_for_each_entry(event, &session->events, list) { | |
437 | event->metadata_dumped = 0; | |
438 | } | |
439 | ||
440 | ret = _lttng_session_metadata_statedump(session); | |
441 | ||
442 | end: | |
443 | mutex_unlock(&sessions_mutex); | |
444 | return ret; | |
445 | } | |
446 | ||
a90917c3 | 447 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 448 | { |
3c997079 | 449 | int ret = 0; |
e64957da | 450 | |
3c997079 MD |
451 | mutex_lock(&sessions_mutex); |
452 | if (channel->channel_type == METADATA_CHANNEL) { | |
453 | ret = -EPERM; | |
454 | goto end; | |
455 | } | |
456 | if (channel->enabled) { | |
457 | ret = -EEXIST; | |
458 | goto end; | |
459 | } | |
460 | /* Set transient enabler state to "enabled" */ | |
461 | channel->tstate = 1; | |
b2bc0bc8 | 462 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 463 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 464 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
465 | end: |
466 | mutex_unlock(&sessions_mutex); | |
467 | return ret; | |
e64957da MD |
468 | } |
469 | ||
a90917c3 | 470 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 471 | { |
3c997079 | 472 | int ret = 0; |
e64957da | 473 | |
3c997079 MD |
474 | mutex_lock(&sessions_mutex); |
475 | if (channel->channel_type == METADATA_CHANNEL) { | |
476 | ret = -EPERM; | |
477 | goto end; | |
478 | } | |
479 | if (!channel->enabled) { | |
480 | ret = -EEXIST; | |
481 | goto end; | |
482 | } | |
483 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 484 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
485 | /* Set transient enabler state to "enabled" */ |
486 | channel->tstate = 0; | |
b2bc0bc8 | 487 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
488 | end: |
489 | mutex_unlock(&sessions_mutex); | |
490 | return ret; | |
e64957da MD |
491 | } |
492 | ||
a90917c3 | 493 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 494 | { |
3c997079 | 495 | int ret = 0; |
e64957da | 496 | |
3c997079 MD |
497 | mutex_lock(&sessions_mutex); |
498 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
499 | ret = -EPERM; | |
500 | goto end; | |
501 | } | |
502 | if (event->enabled) { | |
503 | ret = -EEXIST; | |
504 | goto end; | |
505 | } | |
a0493bef MD |
506 | switch (event->instrumentation) { |
507 | case LTTNG_KERNEL_TRACEPOINT: | |
508 | case LTTNG_KERNEL_SYSCALL: | |
509 | ret = -EINVAL; | |
510 | break; | |
511 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 512 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 513 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 514 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
515 | break; |
516 | case LTTNG_KERNEL_KRETPROBE: | |
517 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
518 | break; | |
e884017c | 519 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
520 | default: |
521 | WARN_ON_ONCE(1); | |
522 | ret = -EINVAL; | |
523 | } | |
3c997079 MD |
524 | end: |
525 | mutex_unlock(&sessions_mutex); | |
526 | return ret; | |
e64957da MD |
527 | } |
528 | ||
a90917c3 | 529 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 530 | { |
3c997079 | 531 | int ret = 0; |
e64957da | 532 | |
3c997079 MD |
533 | mutex_lock(&sessions_mutex); |
534 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
535 | ret = -EPERM; | |
536 | goto end; | |
537 | } | |
538 | if (!event->enabled) { | |
539 | ret = -EEXIST; | |
540 | goto end; | |
541 | } | |
a0493bef MD |
542 | switch (event->instrumentation) { |
543 | case LTTNG_KERNEL_TRACEPOINT: | |
544 | case LTTNG_KERNEL_SYSCALL: | |
545 | ret = -EINVAL; | |
546 | break; | |
547 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 548 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 549 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 550 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
551 | break; |
552 | case LTTNG_KERNEL_KRETPROBE: | |
553 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
554 | break; | |
e884017c | 555 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
556 | default: |
557 | WARN_ON_ONCE(1); | |
558 | ret = -EINVAL; | |
559 | } | |
3c997079 MD |
560 | end: |
561 | mutex_unlock(&sessions_mutex); | |
562 | return ret; | |
e64957da MD |
563 | } |
564 | ||
a90917c3 | 565 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
566 | const char *transport_name, |
567 | void *buf_addr, | |
4e3c1b9b MD |
568 | size_t subbuf_size, size_t num_subbuf, |
569 | unsigned int switch_timer_interval, | |
d83004aa JD |
570 | unsigned int read_timer_interval, |
571 | enum channel_type channel_type) | |
4e3c1b9b | 572 | { |
a90917c3 MD |
573 | struct lttng_channel *chan; |
574 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
575 | |
576 | mutex_lock(&sessions_mutex); | |
d83004aa | 577 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 578 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 579 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 580 | if (!transport) { |
5a15f70c | 581 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 582 | transport_name); |
c0e31d2e | 583 | goto notransport; |
f3d01b96 | 584 | } |
a33c9927 | 585 | if (!try_module_get(transport->owner)) { |
5a15f70c | 586 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
587 | goto notransport; |
588 | } | |
a90917c3 | 589 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 590 | if (!chan) |
c0e31d2e | 591 | goto nomem; |
4e3c1b9b | 592 | chan->session = session; |
05d32c64 | 593 | chan->id = session->free_chan_id++; |
3b731ab1 | 594 | chan->ops = &transport->ops; |
125b4df4 MD |
595 | /* |
596 | * Note: the channel creation op already writes into the packet | |
597 | * headers. Therefore the "chan" information used as input | |
598 | * should be already accessible. | |
599 | */ | |
5f5ddf01 MD |
600 | chan->chan = transport->ops.channel_create(transport_name, |
601 | chan, buf_addr, subbuf_size, num_subbuf, | |
602 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
603 | if (!chan->chan) |
604 | goto create_error; | |
3c997079 | 605 | chan->tstate = 1; |
e64957da | 606 | chan->enabled = 1; |
a33c9927 | 607 | chan->transport = transport; |
d83004aa | 608 | chan->channel_type = channel_type; |
4e3c1b9b MD |
609 | list_add(&chan->list, &session->chan); |
610 | mutex_unlock(&sessions_mutex); | |
611 | return chan; | |
612 | ||
f3d01b96 MD |
613 | create_error: |
614 | kfree(chan); | |
c0e31d2e | 615 | nomem: |
a33c9927 MD |
616 | if (transport) |
617 | module_put(transport->owner); | |
c0e31d2e | 618 | notransport: |
e5382b6d | 619 | active: |
4e3c1b9b MD |
620 | mutex_unlock(&sessions_mutex); |
621 | return NULL; | |
622 | } | |
623 | ||
624 | /* | |
d83004aa JD |
625 | * Only used internally at session destruction for per-cpu channels, and |
626 | * when metadata channel is released. | |
627 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 628 | */ |
aa7c23a9 | 629 | static |
a90917c3 | 630 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 631 | { |
11b5a3c2 | 632 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 633 | module_put(chan->transport->owner); |
4e3c1b9b | 634 | list_del(&chan->list); |
8070f5c0 | 635 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
636 | kfree(chan); |
637 | } | |
638 | ||
d83004aa JD |
639 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
640 | { | |
641 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
642 | ||
643 | /* Protect the metadata cache with the sessions_mutex. */ | |
644 | mutex_lock(&sessions_mutex); | |
645 | _lttng_channel_destroy(chan); | |
646 | mutex_unlock(&sessions_mutex); | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
649 | ||
650 | static | |
651 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
652 | { | |
653 | stream->finalized = 1; | |
654 | wake_up_interruptible(&stream->read_wait); | |
655 | } | |
656 | ||
e5382b6d MD |
657 | /* |
658 | * Supports event creation while tracing session is active. | |
3c997079 | 659 | * Needs to be called with sessions mutex held. |
e5382b6d | 660 | */ |
3c997079 MD |
661 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
662 | struct lttng_kernel_event *event_param, | |
663 | void *filter, | |
664 | const struct lttng_event_desc *event_desc, | |
665 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 666 | { |
3c997079 | 667 | struct lttng_session *session = chan->session; |
a90917c3 | 668 | struct lttng_event *event; |
3c997079 MD |
669 | const char *event_name; |
670 | struct hlist_head *head; | |
3d084699 | 671 | int ret; |
4e3c1b9b | 672 | |
abc0446a | 673 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 674 | ret = -EMFILE; |
e5382b6d | 675 | goto full; |
abc0446a | 676 | } |
3c997079 MD |
677 | |
678 | switch (itype) { | |
679 | case LTTNG_KERNEL_TRACEPOINT: | |
680 | event_name = event_desc->name; | |
681 | break; | |
682 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 683 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 684 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 685 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 686 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
687 | event_name = event_param->name; |
688 | break; | |
e884017c | 689 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
690 | default: |
691 | WARN_ON_ONCE(1); | |
692 | ret = -EINVAL; | |
693 | goto type_error; | |
694 | } | |
4a11ef1c FD |
695 | |
696 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
697 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 698 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
699 | WARN_ON_ONCE(!event->desc); |
700 | if (!strncmp(event->desc->name, event_name, | |
701 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
702 | && chan == event->chan) { | |
703 | ret = -EEXIST; | |
704 | goto exist; | |
abc0446a MD |
705 | } |
706 | } | |
3c997079 | 707 | |
11b5a3c2 | 708 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 709 | if (!event) { |
4cf0bf51 | 710 | ret = -ENOMEM; |
4e3c1b9b | 711 | goto cache_error; |
abc0446a | 712 | } |
4e3c1b9b MD |
713 | event->chan = chan; |
714 | event->filter = filter; | |
e5382b6d | 715 | event->id = chan->free_event_id++; |
3c997079 MD |
716 | event->instrumentation = itype; |
717 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 718 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
719 | INIT_LIST_HEAD(&event->enablers_ref_head); |
720 | ||
721 | switch (itype) { | |
ab2277d6 | 722 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
723 | /* Event will be enabled by enabler sync. */ |
724 | event->enabled = 0; | |
725 | event->registered = 0; | |
0bcedee9 | 726 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 727 | if (!event->desc) { |
4cf0bf51 | 728 | ret = -ENOENT; |
d3dbe23c | 729 | goto register_error; |
abc0446a | 730 | } |
3c997079 MD |
731 | /* Populate lttng_event structure before event registration. */ |
732 | smp_wmb(); | |
baf20995 | 733 | break; |
ab2277d6 | 734 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
735 | /* |
736 | * Needs to be explicitly enabled after creation, since | |
737 | * we may want to apply filters. | |
738 | */ | |
739 | event->enabled = 0; | |
3c997079 MD |
740 | event->registered = 1; |
741 | /* | |
742 | * Populate lttng_event structure before event | |
743 | * registration. | |
744 | */ | |
745 | smp_wmb(); | |
746 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
747 | event_param->u.kprobe.symbol_name, |
748 | event_param->u.kprobe.offset, | |
749 | event_param->u.kprobe.addr, | |
750 | event); | |
abc0446a | 751 | if (ret) { |
4cf0bf51 | 752 | ret = -EINVAL; |
d6d808f3 | 753 | goto register_error; |
abc0446a | 754 | } |
edeb3137 MD |
755 | ret = try_module_get(event->desc->owner); |
756 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 757 | break; |
7371f44c MD |
758 | case LTTNG_KERNEL_KRETPROBE: |
759 | { | |
a90917c3 | 760 | struct lttng_event *event_return; |
7371f44c MD |
761 | |
762 | /* kretprobe defines 2 events */ | |
a0493bef MD |
763 | /* |
764 | * Needs to be explicitly enabled after creation, since | |
765 | * we may want to apply filters. | |
766 | */ | |
767 | event->enabled = 0; | |
3c997079 | 768 | event->registered = 1; |
7371f44c MD |
769 | event_return = |
770 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 771 | if (!event_return) { |
4cf0bf51 | 772 | ret = -ENOMEM; |
7371f44c | 773 | goto register_error; |
abc0446a | 774 | } |
7371f44c MD |
775 | event_return->chan = chan; |
776 | event_return->filter = filter; | |
777 | event_return->id = chan->free_event_id++; | |
a0493bef | 778 | event_return->enabled = 0; |
3c997079 MD |
779 | event_return->registered = 1; |
780 | event_return->instrumentation = itype; | |
7371f44c | 781 | /* |
a90917c3 | 782 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
783 | */ |
784 | smp_wmb(); | |
3c997079 | 785 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
786 | event_param->u.kretprobe.symbol_name, |
787 | event_param->u.kretprobe.offset, | |
788 | event_param->u.kretprobe.addr, | |
789 | event, event_return); | |
790 | if (ret) { | |
791 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 792 | ret = -EINVAL; |
7371f44c MD |
793 | goto register_error; |
794 | } | |
795 | /* Take 2 refs on the module: one per event. */ | |
796 | ret = try_module_get(event->desc->owner); | |
797 | WARN_ON_ONCE(!ret); | |
798 | ret = try_module_get(event->desc->owner); | |
799 | WARN_ON_ONCE(!ret); | |
a90917c3 | 800 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 801 | event_return); |
abc0446a | 802 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
803 | if (ret) { |
804 | kmem_cache_free(event_cache, event_return); | |
805 | module_put(event->desc->owner); | |
806 | module_put(event->desc->owner); | |
807 | goto statedump_error; | |
808 | } | |
809 | list_add(&event_return->list, &chan->session->events); | |
810 | break; | |
811 | } | |
1ec65de1 | 812 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 813 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
814 | /* |
815 | * Needs to be explicitly enabled after creation, since | |
816 | * we may want to apply filters. | |
817 | */ | |
818 | event->enabled = 0; | |
3c997079 MD |
819 | event->registered = 0; |
820 | event->desc = event_desc; | |
badfe9f5 MD |
821 | switch (event_param->u.syscall.entryexit) { |
822 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
823 | ret = -EINVAL; | |
824 | goto register_error; | |
825 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
826 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
827 | break; | |
828 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
829 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
830 | break; | |
831 | } | |
832 | switch (event_param->u.syscall.abi) { | |
833 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
834 | ret = -EINVAL; | |
835 | goto register_error; | |
836 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
837 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
838 | break; | |
839 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
840 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
841 | break; | |
842 | } | |
abc0446a | 843 | if (!event->desc) { |
4cf0bf51 | 844 | ret = -EINVAL; |
259b6cb3 | 845 | goto register_error; |
abc0446a | 846 | } |
1ec65de1 | 847 | break; |
149b9a9d | 848 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
849 | /* |
850 | * Needs to be explicitly enabled after creation, since | |
851 | * we may want to apply filters. | |
852 | */ | |
853 | event->enabled = 0; | |
854 | event->registered = 1; | |
3aed4dca | 855 | |
a344f64b FD |
856 | /* |
857 | * Populate lttng_event structure before event | |
858 | * registration. | |
859 | */ | |
860 | smp_wmb(); | |
149b9a9d YB |
861 | |
862 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 863 | event_param->u.uprobe.fd, |
149b9a9d YB |
864 | event); |
865 | if (ret) | |
866 | goto register_error; | |
867 | ret = try_module_get(event->desc->owner); | |
868 | WARN_ON_ONCE(!ret); | |
869 | break; | |
e884017c | 870 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
871 | default: |
872 | WARN_ON_ONCE(1); | |
4cf0bf51 | 873 | ret = -EINVAL; |
df07930b | 874 | goto register_error; |
baf20995 | 875 | } |
a90917c3 | 876 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
877 | WARN_ON_ONCE(ret > 0); |
878 | if (ret) { | |
c099397a | 879 | goto statedump_error; |
abc0446a | 880 | } |
3c997079 | 881 | hlist_add_head(&event->hlist, head); |
dda6a249 | 882 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
883 | return event; |
884 | ||
c099397a | 885 | statedump_error: |
259b6cb3 | 886 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 887 | register_error: |
11b5a3c2 | 888 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
889 | cache_error: |
890 | exist: | |
3c997079 | 891 | type_error: |
e5382b6d | 892 | full: |
4cf0bf51 | 893 | return ERR_PTR(ret); |
4e3c1b9b MD |
894 | } |
895 | ||
3c997079 MD |
896 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
897 | struct lttng_kernel_event *event_param, | |
898 | void *filter, | |
899 | const struct lttng_event_desc *event_desc, | |
900 | enum lttng_kernel_instrumentation itype) | |
901 | { | |
902 | struct lttng_event *event; | |
903 | ||
904 | mutex_lock(&sessions_mutex); | |
905 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
906 | itype); | |
907 | mutex_unlock(&sessions_mutex); | |
908 | return event; | |
909 | } | |
910 | ||
911 | /* Only used for tracepoints for now. */ | |
912 | static | |
913 | void register_event(struct lttng_event *event) | |
914 | { | |
915 | const struct lttng_event_desc *desc; | |
f127e61e | 916 | int ret = -EINVAL; |
3c997079 | 917 | |
3c997079 MD |
918 | if (event->registered) |
919 | return; | |
4ecb5ad5 | 920 | |
3c997079 | 921 | desc = event->desc; |
4ecb5ad5 MD |
922 | switch (event->instrumentation) { |
923 | case LTTNG_KERNEL_TRACEPOINT: | |
924 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
925 | desc->probe_callback, | |
926 | event); | |
927 | break; | |
928 | case LTTNG_KERNEL_SYSCALL: | |
badfe9f5 | 929 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
930 | break; |
931 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 932 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 933 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
934 | case LTTNG_KERNEL_NOOP: |
935 | ret = 0; | |
936 | break; | |
e884017c | 937 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
938 | default: |
939 | WARN_ON_ONCE(1); | |
940 | } | |
3c997079 MD |
941 | if (!ret) |
942 | event->registered = 1; | |
943 | } | |
944 | ||
4e3c1b9b MD |
945 | /* |
946 | * Only used internally at session destruction. | |
947 | */ | |
a90917c3 | 948 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 949 | { |
4ecb5ad5 | 950 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
951 | int ret = -EINVAL; |
952 | ||
3c997079 MD |
953 | if (!event->registered) |
954 | return 0; | |
955 | ||
4ecb5ad5 | 956 | desc = event->desc; |
38d024ae | 957 | switch (event->instrumentation) { |
ab2277d6 | 958 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 959 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 960 | event->desc->probe_callback, |
11b5a3c2 | 961 | event); |
baf20995 | 962 | break; |
ab2277d6 | 963 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 964 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
965 | ret = 0; |
966 | break; | |
7371f44c MD |
967 | case LTTNG_KERNEL_KRETPROBE: |
968 | lttng_kretprobes_unregister(event); | |
969 | ret = 0; | |
970 | break; | |
33a39a3c | 971 | case LTTNG_KERNEL_SYSCALL: |
badfe9f5 | 972 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
973 | break; |
974 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
975 | ret = 0; |
976 | break; | |
149b9a9d YB |
977 | case LTTNG_KERNEL_UPROBE: |
978 | lttng_uprobes_unregister(event); | |
979 | ret = 0; | |
980 | break; | |
e884017c | 981 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
982 | default: |
983 | WARN_ON_ONCE(1); | |
984 | } | |
3c997079 MD |
985 | if (!ret) |
986 | event->registered = 0; | |
dda6a249 MD |
987 | return ret; |
988 | } | |
989 | ||
990 | /* | |
991 | * Only used internally at session destruction. | |
992 | */ | |
be066e6c | 993 | static |
a90917c3 | 994 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 995 | { |
edeb3137 MD |
996 | switch (event->instrumentation) { |
997 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 998 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
999 | break; |
1000 | case LTTNG_KERNEL_KPROBE: | |
1001 | module_put(event->desc->owner); | |
1002 | lttng_kprobes_destroy_private(event); | |
1003 | break; | |
7371f44c MD |
1004 | case LTTNG_KERNEL_KRETPROBE: |
1005 | module_put(event->desc->owner); | |
1006 | lttng_kretprobes_destroy_private(event); | |
1007 | break; | |
259b6cb3 | 1008 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1009 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1010 | break; |
149b9a9d YB |
1011 | case LTTNG_KERNEL_UPROBE: |
1012 | module_put(event->desc->owner); | |
1013 | lttng_uprobes_destroy_private(event); | |
1014 | break; | |
e884017c | 1015 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1016 | default: |
1017 | WARN_ON_ONCE(1); | |
1018 | } | |
dda6a249 | 1019 | list_del(&event->list); |
8070f5c0 | 1020 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1021 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1022 | } |
1023 | ||
d1f652f8 MD |
1024 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1025 | enum tracker_type tracker_type) | |
e0130fab | 1026 | { |
d1f652f8 MD |
1027 | switch (tracker_type) { |
1028 | case TRACKER_PID: | |
1029 | return &session->pid_tracker; | |
1030 | case TRACKER_VPID: | |
1031 | return &session->vpid_tracker; | |
1032 | case TRACKER_UID: | |
1033 | return &session->uid_tracker; | |
1034 | case TRACKER_VUID: | |
1035 | return &session->vuid_tracker; | |
1036 | case TRACKER_GID: | |
1037 | return &session->gid_tracker; | |
1038 | case TRACKER_VGID: | |
1039 | return &session->vgid_tracker; | |
1040 | default: | |
1041 | WARN_ON_ONCE(1); | |
1042 | return NULL; | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | int lttng_session_track_id(struct lttng_session *session, | |
1047 | enum tracker_type tracker_type, int id) | |
1048 | { | |
1049 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1050 | int ret; |
1051 | ||
d1f652f8 MD |
1052 | tracker = get_tracker(session, tracker_type); |
1053 | if (!tracker) | |
1054 | return -EINVAL; | |
1055 | if (id < -1) | |
e0130fab MD |
1056 | return -EINVAL; |
1057 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1058 | if (id == -1) { |
1059 | /* track all ids: destroy tracker. */ | |
1060 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1061 | ret = 0; |
1062 | } else { | |
d1f652f8 | 1063 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1064 | } |
e0130fab MD |
1065 | mutex_unlock(&sessions_mutex); |
1066 | return ret; | |
1067 | } | |
1068 | ||
d1f652f8 MD |
1069 | int lttng_session_untrack_id(struct lttng_session *session, |
1070 | enum tracker_type tracker_type, int id) | |
e0130fab | 1071 | { |
d1f652f8 | 1072 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1073 | int ret; |
1074 | ||
d1f652f8 MD |
1075 | tracker = get_tracker(session, tracker_type); |
1076 | if (!tracker) | |
1077 | return -EINVAL; | |
1078 | if (id < -1) | |
e0130fab MD |
1079 | return -EINVAL; |
1080 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1081 | if (id == -1) { |
1082 | /* untrack all ids: replace by empty tracker. */ | |
1083 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1084 | } else { |
d1f652f8 | 1085 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1086 | } |
e0130fab MD |
1087 | mutex_unlock(&sessions_mutex); |
1088 | return ret; | |
1089 | } | |
1090 | ||
7e6f9ef6 | 1091 | static |
d1f652f8 | 1092 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1093 | { |
d1f652f8 MD |
1094 | struct lttng_id_tracker *id_tracker = m->private; |
1095 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1096 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1097 | int iter = 0, i; |
1098 | ||
1099 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1100 | if (id_tracker_p) { |
1101 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1102 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1103 | |
f934e302 | 1104 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1105 | if (iter++ >= *pos) |
1106 | return e; | |
1107 | } | |
1108 | } | |
1109 | } else { | |
d1f652f8 | 1110 | /* ID tracker disabled. */ |
7e6f9ef6 | 1111 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1112 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1113 | } |
1114 | iter++; | |
1115 | } | |
1116 | /* End of list */ | |
1117 | return NULL; | |
1118 | } | |
1119 | ||
1120 | /* Called with sessions_mutex held. */ | |
1121 | static | |
d1f652f8 | 1122 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1123 | { |
d1f652f8 MD |
1124 | struct lttng_id_tracker *id_tracker = m->private; |
1125 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1126 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1127 | int iter = 0, i; |
1128 | ||
1129 | (*ppos)++; | |
d1f652f8 MD |
1130 | if (id_tracker_p) { |
1131 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1132 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1133 | |
f934e302 | 1134 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1135 | if (iter++ >= *ppos) |
1136 | return e; | |
1137 | } | |
1138 | } | |
1139 | } else { | |
d1f652f8 | 1140 | /* ID tracker disabled. */ |
7e6f9ef6 | 1141 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1142 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1143 | iter++; |
1144 | } | |
1145 | ||
1146 | /* End of list */ | |
1147 | return NULL; | |
1148 | } | |
1149 | ||
1150 | static | |
d1f652f8 | 1151 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1152 | { |
1153 | mutex_unlock(&sessions_mutex); | |
1154 | } | |
1155 | ||
1156 | static | |
d1f652f8 | 1157 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1158 | { |
d1f652f8 MD |
1159 | struct lttng_id_tracker *id_tracker = m->private; |
1160 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1161 | int id; | |
7e6f9ef6 | 1162 | |
d1f652f8 | 1163 | if (p == id_tracker_p) { |
7e6f9ef6 | 1164 | /* Tracker disabled. */ |
d1f652f8 | 1165 | id = -1; |
7e6f9ef6 | 1166 | } else { |
d1f652f8 | 1167 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1168 | |
d1f652f8 MD |
1169 | id = lttng_id_tracker_get_node_id(e); |
1170 | } | |
1171 | switch (id_tracker->tracker_type) { | |
1172 | case TRACKER_PID: | |
1173 | seq_printf(m, "process { pid = %d; };\n", id); | |
1174 | break; | |
1175 | case TRACKER_VPID: | |
1176 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1177 | break; | |
1178 | case TRACKER_UID: | |
1179 | seq_printf(m, "user { uid = %d; };\n", id); | |
1180 | break; | |
1181 | case TRACKER_VUID: | |
1182 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1183 | break; | |
1184 | case TRACKER_GID: | |
1185 | seq_printf(m, "group { gid = %d; };\n", id); | |
1186 | break; | |
1187 | case TRACKER_VGID: | |
1188 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1189 | break; | |
1190 | default: | |
1191 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1192 | } |
7e6f9ef6 MD |
1193 | return 0; |
1194 | } | |
1195 | ||
1196 | static | |
d1f652f8 MD |
1197 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1198 | .start = id_list_start, | |
1199 | .next = id_list_next, | |
1200 | .stop = id_list_stop, | |
1201 | .show = id_list_show, | |
7e6f9ef6 MD |
1202 | }; |
1203 | ||
1204 | static | |
d1f652f8 | 1205 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1206 | { |
d1f652f8 | 1207 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1208 | } |
1209 | ||
1210 | static | |
d1f652f8 | 1211 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1212 | { |
1213 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1214 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1215 | int ret; |
1216 | ||
d1f652f8 | 1217 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1218 | ret = seq_release(inode, file); |
d1f652f8 MD |
1219 | if (!ret) |
1220 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1221 | return ret; |
1222 | } | |
1223 | ||
d1f652f8 | 1224 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1225 | .owner = THIS_MODULE, |
d1f652f8 | 1226 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1227 | .read = seq_read, |
1228 | .llseek = seq_lseek, | |
d1f652f8 | 1229 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1230 | }; |
1231 | ||
d1f652f8 MD |
1232 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1233 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1234 | { |
d1f652f8 | 1235 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1236 | struct seq_file *m; |
1237 | int file_fd, ret; | |
1238 | ||
1239 | file_fd = lttng_get_unused_fd(); | |
1240 | if (file_fd < 0) { | |
1241 | ret = file_fd; | |
1242 | goto fd_error; | |
1243 | } | |
1244 | ||
d1f652f8 MD |
1245 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1246 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1247 | NULL, O_RDWR); |
d1f652f8 MD |
1248 | if (IS_ERR(tracker_ids_list_file)) { |
1249 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1250 | goto file_error; |
1251 | } | |
98d7281c MJ |
1252 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1253 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1254 | goto refcount_error; |
1255 | } | |
d1f652f8 | 1256 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1257 | if (ret < 0) |
1258 | goto open_error; | |
d1f652f8 MD |
1259 | m = tracker_ids_list_file->private_data; |
1260 | ||
1261 | m->private = get_tracker(session, tracker_type); | |
1262 | BUG_ON(!m->private); | |
1263 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1264 | |
1265 | return file_fd; | |
1266 | ||
1267 | open_error: | |
9c1f4643 MD |
1268 | atomic_long_dec(&session->file->f_count); |
1269 | refcount_error: | |
d1f652f8 | 1270 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1271 | file_error: |
1272 | put_unused_fd(file_fd); | |
1273 | fd_error: | |
1274 | return ret; | |
1275 | } | |
1276 | ||
3c997079 MD |
1277 | /* |
1278 | * Enabler management. | |
1279 | */ | |
1280 | static | |
4993071a PP |
1281 | int lttng_match_enabler_star_glob(const char *desc_name, |
1282 | const char *pattern) | |
3c997079 | 1283 | { |
cbc19040 MD |
1284 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1285 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1286 | return 0; |
1287 | return 1; | |
1288 | } | |
1289 | ||
1290 | static | |
4ecb5ad5 MD |
1291 | int lttng_match_enabler_name(const char *desc_name, |
1292 | const char *name) | |
3c997079 | 1293 | { |
4ecb5ad5 | 1294 | if (strcmp(desc_name, name)) |
3c997079 MD |
1295 | return 0; |
1296 | return 1; | |
1297 | } | |
1298 | ||
1299 | static | |
1300 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1301 | struct lttng_enabler *enabler) | |
1302 | { | |
4ecb5ad5 | 1303 | const char *desc_name, *enabler_name; |
badfe9f5 | 1304 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1305 | |
1306 | enabler_name = enabler->event_param.name; | |
1307 | switch (enabler->event_param.instrumentation) { | |
1308 | case LTTNG_KERNEL_TRACEPOINT: | |
1309 | desc_name = desc->name; | |
3b861b22 FD |
1310 | switch (enabler->format_type) { |
1311 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1312 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1313 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1314 | return lttng_match_enabler_name(desc_name, enabler_name); |
1315 | default: | |
1316 | return -EINVAL; | |
1317 | } | |
4ecb5ad5 MD |
1318 | break; |
1319 | case LTTNG_KERNEL_SYSCALL: | |
1320 | desc_name = desc->name; | |
badfe9f5 | 1321 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1322 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1323 | compat = true; |
1324 | } | |
4ecb5ad5 MD |
1325 | if (!strncmp(desc_name, "syscall_exit_", |
1326 | strlen("syscall_exit_"))) { | |
1327 | desc_name += strlen("syscall_exit_"); | |
1328 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1329 | strlen("syscall_entry_"))) { | |
1330 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1331 | entry = true; |
4ecb5ad5 MD |
1332 | } else { |
1333 | WARN_ON_ONCE(1); | |
1334 | return -EINVAL; | |
1335 | } | |
badfe9f5 MD |
1336 | switch (enabler->event_param.u.syscall.entryexit) { |
1337 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1338 | break; | |
1339 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1340 | if (!entry) | |
1341 | return 0; | |
1342 | break; | |
1343 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1344 | if (entry) | |
1345 | return 0; | |
1346 | break; | |
1347 | default: | |
1348 | return -EINVAL; | |
1349 | } | |
1350 | switch (enabler->event_param.u.syscall.abi) { | |
1351 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1352 | break; | |
1353 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1354 | if (compat) | |
1355 | return 0; | |
1356 | break; | |
1357 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1358 | if (!compat) | |
1359 | return 0; | |
1360 | break; | |
1361 | default: | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | switch (enabler->event_param.u.syscall.match) { | |
1365 | case LTTNG_SYSCALL_MATCH_NAME: | |
3b861b22 FD |
1366 | switch (enabler->format_type) { |
1367 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1368 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1369 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1370 | return lttng_match_enabler_name(desc_name, enabler_name); |
1371 | default: | |
1372 | return -EINVAL; | |
1373 | } | |
1374 | break; | |
1375 | case LTTNG_SYSCALL_MATCH_NR: | |
1376 | return -EINVAL; /* Not implemented. */ | |
1377 | default: | |
1378 | return -EINVAL; | |
1379 | } | |
4ecb5ad5 MD |
1380 | break; |
1381 | default: | |
1382 | WARN_ON_ONCE(1); | |
1383 | return -EINVAL; | |
1384 | } | |
3c997079 MD |
1385 | } |
1386 | ||
1387 | static | |
b2bc0bc8 FD |
1388 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1389 | struct lttng_event *event) | |
3c997079 | 1390 | { |
b2bc0bc8 FD |
1391 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1392 | event_enabler); | |
1393 | ||
1394 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1395 | return 0; |
b2bc0bc8 FD |
1396 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1397 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1398 | return 1; |
1399 | else | |
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | static | |
b2bc0bc8 FD |
1404 | struct lttng_enabler_ref *lttng_enabler_ref( |
1405 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1406 | struct lttng_enabler *enabler) |
1407 | { | |
1408 | struct lttng_enabler_ref *enabler_ref; | |
1409 | ||
b2bc0bc8 | 1410 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1411 | if (enabler_ref->ref == enabler) |
1412 | return enabler_ref; | |
1413 | } | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
3c997079 | 1417 | static |
1b917d6b | 1418 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1419 | { |
b2bc0bc8 | 1420 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1421 | struct lttng_probe_desc *probe_desc; |
1422 | const struct lttng_event_desc *desc; | |
1423 | int i; | |
1424 | struct list_head *probe_list; | |
1425 | ||
1426 | probe_list = lttng_get_probe_list_head(); | |
1427 | /* | |
1428 | * For each probe event, if we find that a probe event matches | |
1429 | * our enabler, create an associated lttng_event if not | |
1430 | * already present. | |
1431 | */ | |
1432 | list_for_each_entry(probe_desc, probe_list, head) { | |
1433 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1434 | int found = 0; | |
1435 | struct hlist_head *head; | |
3c997079 MD |
1436 | struct lttng_event *event; |
1437 | ||
1438 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1439 | if (!lttng_desc_match_enabler(desc, |
1440 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1441 | continue; |
3c997079 MD |
1442 | |
1443 | /* | |
1444 | * Check if already created. | |
1445 | */ | |
4a11ef1c FD |
1446 | head = utils_borrow_hash_table_bucket( |
1447 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1448 | desc->name); | |
d216ecae | 1449 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1450 | if (event->desc == desc |
b2bc0bc8 | 1451 | && event->chan == event_enabler->chan) |
3c997079 MD |
1452 | found = 1; |
1453 | } | |
1454 | if (found) | |
1455 | continue; | |
1456 | ||
1457 | /* | |
1458 | * We need to create an event for this | |
1459 | * event probe. | |
1460 | */ | |
b2bc0bc8 | 1461 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1462 | NULL, NULL, desc, |
1463 | LTTNG_KERNEL_TRACEPOINT); | |
1464 | if (!event) { | |
5a15f70c | 1465 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1466 | probe_desc->event_desc[i]->name); |
1467 | } | |
1468 | } | |
1469 | } | |
1470 | } | |
1471 | ||
33a39a3c | 1472 | static |
1b917d6b | 1473 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1474 | { |
1475 | int ret; | |
1476 | ||
b2bc0bc8 | 1477 | ret = lttng_syscalls_register(event_enabler->chan, NULL); |
33a39a3c MD |
1478 | WARN_ON_ONCE(ret); |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Create struct lttng_event if it is missing and present in the list of | |
1483 | * tracepoint probes. | |
1484 | * Should be called with sessions mutex held. | |
1485 | */ | |
1486 | static | |
b2bc0bc8 | 1487 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1488 | { |
b2bc0bc8 | 1489 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1490 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1491 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1492 | break; |
1493 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1494 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1495 | break; |
1496 | default: | |
1497 | WARN_ON_ONCE(1); | |
1498 | break; | |
1499 | } | |
1500 | } | |
1501 | ||
3c997079 | 1502 | /* |
b2bc0bc8 | 1503 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1504 | * and add backward reference from the event to the enabler. |
1505 | * Should be called with sessions mutex held. | |
1506 | */ | |
1507 | static | |
b2bc0bc8 | 1508 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1509 | { |
b2bc0bc8 FD |
1510 | struct lttng_channel *chan = event_enabler->chan; |
1511 | struct lttng_session *session = event_enabler->chan->session; | |
1512 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1513 | struct lttng_event *event; |
1514 | ||
b2bc0bc8 FD |
1515 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1516 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1517 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1518 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1519 | !strcmp(base_enabler->event_param.name, "*")) { | |
1520 | if (base_enabler->enabled) | |
badfe9f5 MD |
1521 | WRITE_ONCE(chan->syscall_all, 1); |
1522 | else | |
1523 | WRITE_ONCE(chan->syscall_all, 0); | |
1524 | } | |
1525 | ||
3c997079 | 1526 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 1527 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 1528 | |
b2bc0bc8 | 1529 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
1530 | list_for_each_entry(event, &session->events, list) { |
1531 | struct lttng_enabler_ref *enabler_ref; | |
1532 | ||
b2bc0bc8 | 1533 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 1534 | continue; |
b2bc0bc8 FD |
1535 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1536 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
1537 | if (!enabler_ref) { |
1538 | /* | |
1539 | * If no backward ref, create it. | |
b2bc0bc8 | 1540 | * Add backward ref from event to event_enabler. |
3c997079 MD |
1541 | */ |
1542 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1543 | if (!enabler_ref) | |
1544 | return -ENOMEM; | |
b2bc0bc8 | 1545 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
1546 | list_add(&enabler_ref->node, |
1547 | &event->enablers_ref_head); | |
1548 | } | |
1549 | ||
f127e61e MD |
1550 | /* |
1551 | * Link filter bytecodes if not linked yet. | |
1552 | */ | |
2dfda770 FD |
1553 | lttng_enabler_link_bytecode(event->desc, |
1554 | lttng_static_ctx, | |
1555 | &event->bytecode_runtime_head, | |
1556 | lttng_event_enabler_as_enabler(event_enabler)); | |
f127e61e | 1557 | |
3c997079 MD |
1558 | /* TODO: merge event context. */ |
1559 | } | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Called at module load: connect the probe on all enablers matching | |
1565 | * this event. | |
1566 | * Called with sessions lock held. | |
1567 | */ | |
1568 | int lttng_fix_pending_events(void) | |
1569 | { | |
1570 | struct lttng_session *session; | |
1571 | ||
1572 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 1573 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
1574 | return 0; |
1575 | } | |
1576 | ||
b2bc0bc8 FD |
1577 | struct lttng_event_enabler *lttng_event_enabler_create( |
1578 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
1579 | struct lttng_kernel_event *event_param, |
1580 | struct lttng_channel *chan) | |
1581 | { | |
b2bc0bc8 | 1582 | struct lttng_event_enabler *event_enabler; |
3c997079 | 1583 | |
b2bc0bc8 FD |
1584 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
1585 | if (!event_enabler) | |
3c997079 | 1586 | return NULL; |
b2bc0bc8 FD |
1587 | event_enabler->base.format_type = format_type; |
1588 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1589 | memcpy(&event_enabler->base.event_param, event_param, | |
1590 | sizeof(event_enabler->base.event_param)); | |
1591 | event_enabler->chan = chan; | |
3c997079 | 1592 | /* ctx left NULL */ |
b2bc0bc8 FD |
1593 | event_enabler->base.enabled = 0; |
1594 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 1595 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
1596 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
1597 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 1598 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 1599 | return event_enabler; |
3c997079 MD |
1600 | } |
1601 | ||
b2bc0bc8 | 1602 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1603 | { |
1604 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1605 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1606 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1607 | mutex_unlock(&sessions_mutex); |
1608 | return 0; | |
1609 | } | |
1610 | ||
b2bc0bc8 | 1611 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1612 | { |
1613 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1614 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1615 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1616 | mutex_unlock(&sessions_mutex); |
1617 | return 0; | |
1618 | } | |
1619 | ||
b2bc0bc8 | 1620 | static |
07dfc1d0 MD |
1621 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1622 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1623 | { | |
1624 | struct lttng_filter_bytecode_node *bytecode_node; | |
1625 | uint32_t bytecode_len; | |
1626 | int ret; | |
1627 | ||
1628 | ret = get_user(bytecode_len, &bytecode->len); | |
1629 | if (ret) | |
1630 | return ret; | |
1631 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1632 | GFP_KERNEL); | |
1633 | if (!bytecode_node) | |
1634 | return -ENOMEM; | |
1635 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1636 | sizeof(*bytecode) + bytecode_len); | |
1637 | if (ret) | |
1638 | goto error_free; | |
b2bc0bc8 | 1639 | |
07dfc1d0 MD |
1640 | bytecode_node->enabler = enabler; |
1641 | /* Enforce length based on allocated size */ | |
1642 | bytecode_node->bc.len = bytecode_len; | |
1643 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 1644 | |
07dfc1d0 MD |
1645 | return 0; |
1646 | ||
1647 | error_free: | |
1648 | kfree(bytecode_node); | |
1649 | return ret; | |
1650 | } | |
1651 | ||
b2bc0bc8 FD |
1652 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, |
1653 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1654 | { | |
1655 | int ret; | |
1656 | ret = lttng_enabler_attach_bytecode( | |
1657 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1658 | if (ret) | |
1659 | goto error; | |
1660 | ||
1661 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1662 | return 0; | |
1663 | ||
1664 | error: | |
1665 | return ret; | |
1666 | } | |
1667 | ||
3aed4dca FD |
1668 | int lttng_event_add_callsite(struct lttng_event *event, |
1669 | struct lttng_kernel_event_callsite __user *callsite) | |
1670 | { | |
1671 | ||
1672 | switch (event->instrumentation) { | |
1673 | case LTTNG_KERNEL_UPROBE: | |
1674 | return lttng_uprobes_add_callsite(event, callsite); | |
1675 | default: | |
1676 | return -EINVAL; | |
1677 | } | |
1678 | } | |
1679 | ||
b2bc0bc8 | 1680 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
1681 | struct lttng_kernel_context *context_param) |
1682 | { | |
1683 | return -ENOSYS; | |
1684 | } | |
1685 | ||
1686 | static | |
1687 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1688 | { | |
07dfc1d0 MD |
1689 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1690 | ||
1691 | /* Destroy filter bytecode */ | |
1692 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1693 | &enabler->filter_bytecode_head, node) { | |
1694 | kfree(filter_node); | |
1695 | } | |
b2bc0bc8 FD |
1696 | } |
1697 | ||
1698 | static | |
1699 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
1700 | { | |
1701 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 1702 | |
3c997079 | 1703 | /* Destroy contexts */ |
b2bc0bc8 | 1704 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 1705 | |
b2bc0bc8 FD |
1706 | list_del(&event_enabler->node); |
1707 | kfree(event_enabler); | |
3c997079 MD |
1708 | } |
1709 | ||
1710 | /* | |
b2bc0bc8 | 1711 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
1712 | * session. |
1713 | * Should be called with sessions mutex held. | |
1714 | */ | |
1715 | static | |
b2bc0bc8 | 1716 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 1717 | { |
b2bc0bc8 | 1718 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
1719 | struct lttng_event *event; |
1720 | ||
b2bc0bc8 FD |
1721 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
1722 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
1723 | /* |
1724 | * For each event, if at least one of its enablers is enabled, | |
1725 | * and its channel and session transient states are enabled, we | |
1726 | * enable the event, else we disable it. | |
1727 | */ | |
1728 | list_for_each_entry(event, &session->events, list) { | |
1729 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1730 | struct lttng_bytecode_runtime *runtime; |
1731 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1732 | |
4ecb5ad5 MD |
1733 | switch (event->instrumentation) { |
1734 | case LTTNG_KERNEL_TRACEPOINT: | |
1735 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1736 | /* Enable events */ |
1737 | list_for_each_entry(enabler_ref, | |
1738 | &event->enablers_ref_head, node) { | |
1739 | if (enabler_ref->ref->enabled) { | |
1740 | enabled = 1; | |
1741 | break; | |
1742 | } | |
1743 | } | |
4ecb5ad5 MD |
1744 | break; |
1745 | default: | |
3c997079 MD |
1746 | /* Not handled with lazy sync. */ |
1747 | continue; | |
1748 | } | |
1749 | /* | |
1750 | * Enabled state is based on union of enablers, with | |
1751 | * intesection of session and channel transient enable | |
1752 | * states. | |
1753 | */ | |
1754 | enabled = enabled && session->tstate && event->chan->tstate; | |
1755 | ||
a8f2d0c7 | 1756 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1757 | /* |
1758 | * Sync tracepoint registration with event enabled | |
1759 | * state. | |
1760 | */ | |
1761 | if (enabled) { | |
1762 | register_event(event); | |
1763 | } else { | |
1764 | _lttng_event_unregister(event); | |
1765 | } | |
07dfc1d0 MD |
1766 | |
1767 | /* Check if has enablers without bytecode enabled */ | |
1768 | list_for_each_entry(enabler_ref, | |
1769 | &event->enablers_ref_head, node) { | |
1770 | if (enabler_ref->ref->enabled | |
1771 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1772 | has_enablers_without_bytecode = 1; | |
1773 | break; | |
1774 | } | |
1775 | } | |
1776 | event->has_enablers_without_bytecode = | |
1777 | has_enablers_without_bytecode; | |
1778 | ||
1779 | /* Enable filters */ | |
1780 | list_for_each_entry(runtime, | |
f127e61e | 1781 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1782 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1783 | } |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * Apply enablers to session events, adding events to session if need | |
1788 | * be. It is required after each modification applied to an active | |
1789 | * session, and right before session "start". | |
1790 | * "lazy" sync means we only sync if required. | |
1791 | * Should be called with sessions mutex held. | |
1792 | */ | |
1793 | static | |
b2bc0bc8 | 1794 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
1795 | { |
1796 | /* We can skip if session is not active */ | |
1797 | if (!session->active) | |
1798 | return; | |
b2bc0bc8 | 1799 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
1800 | } |
1801 | ||
1ec3f75a | 1802 | /* |
d83004aa JD |
1803 | * Serialize at most one packet worth of metadata into a metadata |
1804 | * channel. | |
92d9f5e6 MD |
1805 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1806 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1807 | * allows us to do racy operations such as looking for remaining space left in | |
1808 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1809 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1810 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1811 | * Returns the number of bytes written in the channel, 0 if no data |
1812 | * was written and a negative value on error. | |
1ec3f75a | 1813 | */ |
b3b8072b | 1814 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 1815 | struct channel *chan, bool *coherent) |
d83004aa JD |
1816 | { |
1817 | struct lib_ring_buffer_ctx ctx; | |
1818 | int ret = 0; | |
1819 | size_t len, reserve_len; | |
1820 | ||
f613e3e6 | 1821 | /* |
92d9f5e6 MD |
1822 | * Ensure we support mutiple get_next / put sequences followed by |
1823 | * put_next. The metadata cache lock protects reading the metadata | |
1824 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1825 | * "flush" operations on the buffer invoked by different processes. | |
1826 | * Moreover, since the metadata cache memory can be reallocated, we | |
1827 | * need to have exclusive access against updates even though we only | |
1828 | * read it. | |
f613e3e6 | 1829 | */ |
92d9f5e6 | 1830 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1831 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1832 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1833 | goto end; |
f613e3e6 | 1834 | |
9616f0bf JD |
1835 | /* Metadata regenerated, change the version. */ |
1836 | if (stream->metadata_cache->version != stream->version) | |
1837 | stream->version = stream->metadata_cache->version; | |
1838 | ||
d83004aa | 1839 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1840 | stream->metadata_in; |
9de2c215 | 1841 | if (!len) |
de23d59d | 1842 | goto end; |
d83004aa | 1843 | reserve_len = min_t(size_t, |
b3b8072b | 1844 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1845 | len); |
b3b8072b | 1846 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1847 | sizeof(char), -1); |
1848 | /* | |
1849 | * If reservation failed, return an error to the caller. | |
1850 | */ | |
b3b8072b | 1851 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1852 | if (ret != 0) { |
1853 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 1854 | stream->coherent = false; |
d83004aa JD |
1855 | goto end; |
1856 | } | |
b3b8072b | 1857 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1858 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1859 | reserve_len); |
b3b8072b | 1860 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1861 | stream->metadata_in += reserve_len; |
3e75e2a7 | 1862 | if (reserve_len < len) |
8b97fd42 MD |
1863 | stream->coherent = false; |
1864 | else | |
1865 | stream->coherent = true; | |
d83004aa JD |
1866 | ret = reserve_len; |
1867 | ||
1868 | end: | |
8b97fd42 MD |
1869 | if (coherent) |
1870 | *coherent = stream->coherent; | |
92d9f5e6 | 1871 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1872 | return ret; |
1873 | } | |
1874 | ||
8b97fd42 MD |
1875 | static |
1876 | void lttng_metadata_begin(struct lttng_session *session) | |
1877 | { | |
3e75e2a7 MD |
1878 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1879 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
1880 | } |
1881 | ||
1882 | static | |
1883 | void lttng_metadata_end(struct lttng_session *session) | |
1884 | { | |
3e75e2a7 MD |
1885 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1886 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1887 | struct lttng_metadata_stream *stream; | |
1888 | ||
3e75e2a7 MD |
1889 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1890 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 1891 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 1892 | } |
8b97fd42 MD |
1893 | } |
1894 | ||
d83004aa JD |
1895 | /* |
1896 | * Write the metadata to the metadata cache. | |
1897 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1898 | * The metadata cache lock protects us from concurrent read access from |
1899 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
1900 | * The content of the printf is printed as a single atomic metadata |
1901 | * transaction. | |
d83004aa | 1902 | */ |
a90917c3 | 1903 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1904 | const char *fmt, ...) |
1905 | { | |
c099397a | 1906 | char *str; |
d83004aa | 1907 | size_t len; |
c099397a MD |
1908 | va_list ap; |
1909 | ||
585e5dcc | 1910 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
1911 | |
1912 | va_start(ap, fmt); | |
1913 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1914 | va_end(ap); | |
1915 | if (!str) | |
1916 | return -ENOMEM; | |
1917 | ||
1ec3f75a | 1918 | len = strlen(str); |
3e75e2a7 | 1919 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1920 | if (session->metadata_cache->metadata_written + len > |
1921 | session->metadata_cache->cache_alloc) { | |
1922 | char *tmp_cache_realloc; | |
1923 | unsigned int tmp_cache_alloc_size; | |
1924 | ||
1925 | tmp_cache_alloc_size = max_t(unsigned int, | |
1926 | session->metadata_cache->cache_alloc + len, | |
1927 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1928 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1929 | if (!tmp_cache_realloc) |
1930 | goto err; | |
a606b6e8 ML |
1931 | if (session->metadata_cache->data) { |
1932 | memcpy(tmp_cache_realloc, | |
1933 | session->metadata_cache->data, | |
1934 | session->metadata_cache->cache_alloc); | |
1935 | vfree(session->metadata_cache->data); | |
1936 | } | |
1937 | ||
d83004aa JD |
1938 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1939 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1940 | } |
d83004aa JD |
1941 | memcpy(session->metadata_cache->data + |
1942 | session->metadata_cache->metadata_written, | |
1943 | str, len); | |
1944 | session->metadata_cache->metadata_written += len; | |
c099397a | 1945 | kfree(str); |
d83004aa | 1946 | |
d83004aa JD |
1947 | return 0; |
1948 | ||
1949 | err: | |
1950 | kfree(str); | |
1951 | return -ENOMEM; | |
c099397a MD |
1952 | } |
1953 | ||
f513b2bf MD |
1954 | static |
1955 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1956 | { | |
1957 | size_t i; | |
1958 | ||
1959 | for (i = 0; i < nesting; i++) { | |
1960 | int ret; | |
1961 | ||
1962 | ret = lttng_metadata_printf(session, " "); | |
1963 | if (ret) { | |
1964 | return ret; | |
1965 | } | |
1966 | } | |
1967 | return 0; | |
1968 | } | |
1969 | ||
ceabb767 MD |
1970 | static |
1971 | int lttng_field_name_statedump(struct lttng_session *session, | |
1972 | const struct lttng_event_field *field, | |
1973 | size_t nesting) | |
1974 | { | |
1975 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1976 | } | |
1977 | ||
1978 | static | |
1979 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1980 | const struct lttng_type *type, | |
1981 | size_t nesting) | |
1982 | { | |
1983 | int ret; | |
1984 | ||
1985 | WARN_ON_ONCE(type->atype != atype_integer); | |
1986 | ret = print_tabs(session, nesting); | |
1987 | if (ret) | |
1988 | return ret; | |
1989 | ret = lttng_metadata_printf(session, | |
1990 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1991 | type->u.integer.size, | |
1992 | type->u.integer.alignment, | |
1993 | type->u.integer.signedness, | |
1994 | (type->u.integer.encoding == lttng_encode_none) | |
1995 | ? "none" | |
1996 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1997 | ? "UTF8" | |
1998 | : "ASCII", | |
1999 | type->u.integer.base, | |
2000 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2001 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2002 | #else | |
2003 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2004 | #endif | |
2005 | ); | |
2006 | return ret; | |
2007 | } | |
2008 | ||
f513b2bf MD |
2009 | /* |
2010 | * Must be called with sessions_mutex held. | |
2011 | */ | |
2012 | static | |
2013 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2014 | const struct lttng_type *type, | |
2015 | size_t nesting) | |
2016 | { | |
2017 | int ret; | |
2018 | uint32_t i, nr_fields; | |
ceabb767 MD |
2019 | unsigned int alignment; |
2020 | ||
2021 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2022 | |
2023 | ret = print_tabs(session, nesting); | |
2024 | if (ret) | |
2025 | return ret; | |
2026 | ret = lttng_metadata_printf(session, | |
2027 | "struct {\n"); | |
2028 | if (ret) | |
2029 | return ret; | |
ceabb767 | 2030 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2031 | for (i = 0; i < nr_fields; i++) { |
2032 | const struct lttng_event_field *iter_field; | |
2033 | ||
ceabb767 | 2034 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2035 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2036 | if (ret) | |
2037 | return ret; | |
2038 | } | |
2039 | ret = print_tabs(session, nesting); | |
2040 | if (ret) | |
2041 | return ret; | |
ceabb767 MD |
2042 | alignment = type->u.struct_nestable.alignment; |
2043 | if (alignment) { | |
2044 | ret = lttng_metadata_printf(session, | |
2045 | "} align(%u)", | |
2046 | alignment); | |
2047 | } else { | |
2048 | ret = lttng_metadata_printf(session, | |
2049 | "}"); | |
2050 | } | |
f513b2bf MD |
2051 | return ret; |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * Must be called with sessions_mutex held. | |
2056 | */ | |
2057 | static | |
ceabb767 | 2058 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2059 | const struct lttng_event_field *field, |
2060 | size_t nesting) | |
2061 | { | |
2062 | int ret; | |
2063 | ||
2064 | ret = _lttng_struct_type_statedump(session, | |
2065 | &field->type, nesting); | |
2066 | if (ret) | |
2067 | return ret; | |
ceabb767 | 2068 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2069 | } |
2070 | ||
65c85aa6 MD |
2071 | /* |
2072 | * Must be called with sessions_mutex held. | |
2073 | */ | |
2074 | static | |
2075 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2076 | const struct lttng_type *type, | |
2077 | size_t nesting) | |
2078 | { | |
2079 | int ret; | |
2080 | uint32_t i, nr_choices; | |
2081 | ||
ceabb767 MD |
2082 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2083 | /* | |
2084 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2085 | */ | |
2086 | if (type->u.variant_nestable.alignment != 0) | |
2087 | return -EINVAL; | |
65c85aa6 MD |
2088 | ret = print_tabs(session, nesting); |
2089 | if (ret) | |
2090 | return ret; | |
2091 | ret = lttng_metadata_printf(session, | |
2092 | "variant <_%s> {\n", | |
ceabb767 | 2093 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2094 | if (ret) |
2095 | return ret; | |
ceabb767 | 2096 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2097 | for (i = 0; i < nr_choices; i++) { |
2098 | const struct lttng_event_field *iter_field; | |
2099 | ||
ceabb767 | 2100 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2101 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2102 | if (ret) | |
2103 | return ret; | |
2104 | } | |
2105 | ret = print_tabs(session, nesting); | |
2106 | if (ret) | |
2107 | return ret; | |
2108 | ret = lttng_metadata_printf(session, | |
2109 | "}"); | |
2110 | return ret; | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * Must be called with sessions_mutex held. | |
2115 | */ | |
2116 | static | |
ceabb767 | 2117 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2118 | const struct lttng_event_field *field, |
2119 | size_t nesting) | |
2120 | { | |
2121 | int ret; | |
2122 | ||
2123 | ret = _lttng_variant_type_statedump(session, | |
2124 | &field->type, nesting); | |
2125 | if (ret) | |
2126 | return ret; | |
ceabb767 | 2127 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2128 | } |
2129 | ||
f513b2bf MD |
2130 | /* |
2131 | * Must be called with sessions_mutex held. | |
2132 | */ | |
2133 | static | |
ceabb767 | 2134 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2135 | const struct lttng_event_field *field, |
2136 | size_t nesting) | |
2137 | { | |
2138 | int ret; | |
2139 | const struct lttng_type *elem_type; | |
2140 | ||
ceabb767 MD |
2141 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2142 | ||
2143 | if (field->type.u.array_nestable.alignment) { | |
2144 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2145 | if (ret) |
2146 | return ret; | |
ceabb767 MD |
2147 | ret = lttng_metadata_printf(session, |
2148 | "struct { } align(%u) _%s_padding;\n", | |
2149 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2150 | field->name); | |
2151 | if (ret) | |
2152 | return ret; | |
2153 | } | |
2154 | /* | |
2155 | * Nested compound types: Only array of structures and variants are | |
2156 | * currently supported. | |
2157 | */ | |
2158 | elem_type = field->type.u.array_nestable.elem_type; | |
2159 | switch (elem_type->atype) { | |
2160 | case atype_integer: | |
2161 | case atype_struct_nestable: | |
2162 | case atype_variant_nestable: | |
2163 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2164 | if (ret) |
2165 | return ret; | |
2166 | break; | |
ceabb767 | 2167 | |
f513b2bf MD |
2168 | default: |
2169 | return -EINVAL; | |
2170 | } | |
2171 | ret = lttng_metadata_printf(session, | |
2172 | " _%s[%u];\n", | |
2173 | field->name, | |
ceabb767 | 2174 | field->type.u.array_nestable.length); |
f513b2bf MD |
2175 | return ret; |
2176 | } | |
2177 | ||
2178 | /* | |
2179 | * Must be called with sessions_mutex held. | |
2180 | */ | |
2181 | static | |
ceabb767 | 2182 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2183 | const struct lttng_event_field *field, |
2184 | size_t nesting) | |
2185 | { | |
2186 | int ret; | |
2187 | const char *length_name; | |
2188 | const struct lttng_type *elem_type; | |
2189 | ||
ceabb767 | 2190 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2191 | |
ceabb767 MD |
2192 | length_name = field->type.u.sequence_nestable.length_name; |
2193 | ||
2194 | if (field->type.u.sequence_nestable.alignment) { | |
2195 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2196 | if (ret) |
2197 | return ret; | |
ceabb767 MD |
2198 | ret = lttng_metadata_printf(session, |
2199 | "struct { } align(%u) _%s_padding;\n", | |
2200 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2201 | field->name); | |
2202 | if (ret) | |
2203 | return ret; | |
2204 | } | |
2205 | ||
2206 | /* | |
2207 | * Nested compound types: Only array of structures and variants are | |
2208 | * currently supported. | |
2209 | */ | |
2210 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2211 | switch (elem_type->atype) { | |
2212 | case atype_integer: | |
2213 | case atype_struct_nestable: | |
2214 | case atype_variant_nestable: | |
2215 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2216 | if (ret) |
2217 | return ret; | |
2218 | break; | |
ceabb767 | 2219 | |
f513b2bf MD |
2220 | default: |
2221 | return -EINVAL; | |
2222 | } | |
2223 | ret = lttng_metadata_printf(session, | |
2224 | " _%s[ _%s ];\n", | |
2225 | field->name, | |
ceabb767 | 2226 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2227 | return ret; |
2228 | } | |
2229 | ||
141ddf28 MD |
2230 | /* |
2231 | * Must be called with sessions_mutex held. | |
2232 | */ | |
2233 | static | |
ceabb767 MD |
2234 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2235 | const struct lttng_type *type, | |
141ddf28 MD |
2236 | size_t nesting) |
2237 | { | |
2238 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2239 | const struct lttng_type *container_type; |
141ddf28 MD |
2240 | int ret; |
2241 | unsigned int i, nr_entries; | |
2242 | ||
ceabb767 MD |
2243 | container_type = type->u.enum_nestable.container_type; |
2244 | if (container_type->atype != atype_integer) { | |
2245 | ret = -EINVAL; | |
2246 | goto end; | |
2247 | } | |
2248 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2249 | nr_entries = enum_desc->nr_entries; |
2250 | ||
2251 | ret = print_tabs(session, nesting); | |
2252 | if (ret) | |
2253 | goto end; | |
ceabb767 MD |
2254 | ret = lttng_metadata_printf(session, "enum : "); |
2255 | if (ret) | |
2256 | goto end; | |
2257 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2258 | if (ret) |
ceabb767 MD |
2259 | goto end; |
2260 | ret = lttng_metadata_printf(session, " {\n"); | |
2261 | if (ret) | |
2262 | goto end; | |
141ddf28 MD |
2263 | /* Dump all entries */ |
2264 | for (i = 0; i < nr_entries; i++) { | |
2265 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2266 | int j, len; | |
2267 | ||
2268 | ret = print_tabs(session, nesting + 1); | |
2269 | if (ret) | |
2270 | goto end; | |
2271 | ret = lttng_metadata_printf(session, | |
2272 | "\""); | |
2273 | if (ret) | |
2274 | goto end; | |
2275 | len = strlen(entry->string); | |
2276 | /* Escape the character '"' */ | |
2277 | for (j = 0; j < len; j++) { | |
2278 | char c = entry->string[j]; | |
2279 | ||
2280 | switch (c) { | |
2281 | case '"': | |
2282 | ret = lttng_metadata_printf(session, | |
2283 | "\\\""); | |
2284 | break; | |
2285 | case '\\': | |
2286 | ret = lttng_metadata_printf(session, | |
2287 | "\\\\"); | |
2288 | break; | |
2289 | default: | |
2290 | ret = lttng_metadata_printf(session, | |
2291 | "%c", c); | |
2292 | break; | |
2293 | } | |
2294 | if (ret) | |
2295 | goto end; | |
2296 | } | |
08ad1061 PP |
2297 | ret = lttng_metadata_printf(session, "\""); |
2298 | if (ret) | |
2299 | goto end; | |
2300 | ||
2301 | if (entry->options.is_auto) { | |
2302 | ret = lttng_metadata_printf(session, ",\n"); | |
2303 | if (ret) | |
2304 | goto end; | |
141ddf28 | 2305 | } else { |
7c559490 MD |
2306 | ret = lttng_metadata_printf(session, |
2307 | " = "); | |
2308 | if (ret) | |
2309 | goto end; | |
2310 | if (entry->start.signedness) | |
141ddf28 | 2311 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2312 | "%lld", (long long) entry->start.value); |
2313 | else | |
2314 | ret = lttng_metadata_printf(session, | |
2315 | "%llu", entry->start.value); | |
2316 | if (ret) | |
2317 | goto end; | |
2318 | if (entry->start.signedness == entry->end.signedness && | |
2319 | entry->start.value | |
2320 | == entry->end.value) { | |
141ddf28 | 2321 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2322 | ",\n"); |
2323 | } else { | |
2324 | if (entry->end.signedness) { | |
2325 | ret = lttng_metadata_printf(session, | |
2326 | " ... %lld,\n", | |
2327 | (long long) entry->end.value); | |
2328 | } else { | |
2329 | ret = lttng_metadata_printf(session, | |
2330 | " ... %llu,\n", | |
2331 | entry->end.value); | |
2332 | } | |
141ddf28 | 2333 | } |
7c559490 MD |
2334 | if (ret) |
2335 | goto end; | |
141ddf28 | 2336 | } |
141ddf28 MD |
2337 | } |
2338 | ret = print_tabs(session, nesting); | |
2339 | if (ret) | |
2340 | goto end; | |
ceabb767 | 2341 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2342 | end: |
2343 | return ret; | |
2344 | } | |
2345 | ||
d83004aa JD |
2346 | /* |
2347 | * Must be called with sessions_mutex held. | |
2348 | */ | |
c099397a | 2349 | static |
ceabb767 MD |
2350 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2351 | const struct lttng_event_field *field, | |
2352 | size_t nesting) | |
2353 | { | |
2354 | int ret; | |
2355 | ||
2356 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2357 | if (ret) | |
2358 | return ret; | |
2359 | return lttng_field_name_statedump(session, field, nesting); | |
2360 | } | |
2361 | ||
2362 | static | |
2363 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2364 | const struct lttng_event_field *field, | |
2365 | size_t nesting) | |
2366 | { | |
2367 | int ret; | |
2368 | ||
2369 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2370 | if (ret) | |
2371 | return ret; | |
2372 | return lttng_field_name_statedump(session, field, nesting); | |
2373 | } | |
2374 | ||
2375 | static | |
2376 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2377 | const struct lttng_type *type, | |
2378 | size_t nesting) | |
2379 | { | |
2380 | int ret; | |
2381 | ||
2382 | WARN_ON_ONCE(type->atype != atype_string); | |
2383 | /* Default encoding is UTF8 */ | |
2384 | ret = print_tabs(session, nesting); | |
2385 | if (ret) | |
2386 | return ret; | |
2387 | ret = lttng_metadata_printf(session, | |
2388 | "string%s", | |
2389 | type->u.string.encoding == lttng_encode_ASCII ? | |
2390 | " { encoding = ASCII; }" : ""); | |
2391 | return ret; | |
2392 | } | |
2393 | ||
2394 | static | |
2395 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2396 | const struct lttng_event_field *field, |
2397 | size_t nesting) | |
ceabb767 MD |
2398 | { |
2399 | int ret; | |
2400 | ||
2401 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2402 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2403 | if (ret) | |
2404 | return ret; | |
2405 | return lttng_field_name_statedump(session, field, nesting); | |
2406 | } | |
2407 | ||
2408 | /* | |
2409 | * Must be called with sessions_mutex held. | |
2410 | */ | |
2411 | static | |
2412 | int _lttng_type_statedump(struct lttng_session *session, | |
2413 | const struct lttng_type *type, | |
2414 | size_t nesting) | |
c099397a | 2415 | { |
c099397a | 2416 | int ret = 0; |
c099397a | 2417 | |
ceabb767 | 2418 | switch (type->atype) { |
8070f5c0 | 2419 | case atype_integer: |
ceabb767 | 2420 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2421 | break; |
ceabb767 MD |
2422 | case atype_enum_nestable: |
2423 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2424 | break; |
ceabb767 MD |
2425 | case atype_string: |
2426 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2427 | break; | |
2428 | case atype_struct_nestable: | |
2429 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2430 | break; |
ceabb767 MD |
2431 | case atype_variant_nestable: |
2432 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2433 | break; | |
2434 | ||
2435 | /* Nested arrays and sequences are not supported yet. */ | |
2436 | case atype_array_nestable: | |
2437 | case atype_sequence_nestable: | |
2438 | default: | |
2439 | WARN_ON_ONCE(1); | |
2440 | return -EINVAL; | |
8070f5c0 | 2441 | } |
ceabb767 MD |
2442 | return ret; |
2443 | } | |
8070f5c0 | 2444 | |
ceabb767 MD |
2445 | /* |
2446 | * Must be called with sessions_mutex held. | |
2447 | */ | |
2448 | static | |
2449 | int _lttng_field_statedump(struct lttng_session *session, | |
2450 | const struct lttng_event_field *field, | |
2451 | size_t nesting) | |
2452 | { | |
2453 | int ret = 0; | |
27d2368e | 2454 | |
ceabb767 MD |
2455 | switch (field->type.atype) { |
2456 | case atype_integer: | |
2457 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2458 | break; | |
2459 | case atype_enum_nestable: | |
2460 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2461 | break; |
8070f5c0 | 2462 | case atype_string: |
ceabb767 | 2463 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2464 | break; |
ceabb767 MD |
2465 | case atype_struct_nestable: |
2466 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2467 | break; |
ceabb767 MD |
2468 | case atype_array_nestable: |
2469 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2470 | break; |
ceabb767 MD |
2471 | case atype_sequence_nestable: |
2472 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2473 | break; |
ceabb767 MD |
2474 | case atype_variant_nestable: |
2475 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2476 | break; |
f513b2bf | 2477 | |
8070f5c0 MD |
2478 | default: |
2479 | WARN_ON_ONCE(1); | |
2480 | return -EINVAL; | |
2481 | } | |
2482 | return ret; | |
2483 | } | |
2484 | ||
2485 | static | |
a90917c3 | 2486 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2487 | struct lttng_ctx *ctx) |
2488 | { | |
2489 | int ret = 0; | |
2490 | int i; | |
2491 | ||
2492 | if (!ctx) | |
2493 | return 0; | |
2494 | for (i = 0; i < ctx->nr_fields; i++) { | |
2495 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2496 | ||
f513b2bf | 2497 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2498 | if (ret) |
2499 | return ret; | |
2500 | } | |
2501 | return ret; | |
2502 | } | |
2503 | ||
2504 | static | |
a90917c3 MD |
2505 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2506 | struct lttng_event *event) | |
8070f5c0 MD |
2507 | { |
2508 | const struct lttng_event_desc *desc = event->desc; | |
2509 | int ret = 0; | |
2510 | int i; | |
2511 | ||
2512 | for (i = 0; i < desc->nr_fields; i++) { | |
2513 | const struct lttng_event_field *field = &desc->fields[i]; | |
2514 | ||
f513b2bf | 2515 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2516 | if (ret) |
2517 | return ret; | |
c099397a MD |
2518 | } |
2519 | return ret; | |
2520 | } | |
2521 | ||
d83004aa JD |
2522 | /* |
2523 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2524 | * The entire event metadata is printed as a single atomic metadata |
2525 | * transaction. | |
d83004aa | 2526 | */ |
c099397a | 2527 | static |
a90917c3 MD |
2528 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2529 | struct lttng_channel *chan, | |
2530 | struct lttng_event *event) | |
c099397a MD |
2531 | { |
2532 | int ret = 0; | |
2533 | ||
585e5dcc | 2534 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2535 | return 0; |
d83004aa | 2536 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2537 | return 0; |
2538 | ||
8b97fd42 MD |
2539 | lttng_metadata_begin(session); |
2540 | ||
c099397a MD |
2541 | ret = lttng_metadata_printf(session, |
2542 | "event {\n" | |
ae734547 | 2543 | " name = \"%s\";\n" |
c099397a | 2544 | " id = %u;\n" |
b9074a1b | 2545 | " stream_id = %u;\n", |
c099397a MD |
2546 | event->desc->name, |
2547 | event->id, | |
2548 | event->chan->id); | |
2549 | if (ret) | |
2550 | goto end; | |
2551 | ||
b9074a1b MD |
2552 | if (event->ctx) { |
2553 | ret = lttng_metadata_printf(session, | |
2554 | " context := struct {\n"); | |
2555 | if (ret) | |
2556 | goto end; | |
2557 | } | |
a90917c3 | 2558 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2559 | if (ret) |
2560 | goto end; | |
b9074a1b MD |
2561 | if (event->ctx) { |
2562 | ret = lttng_metadata_printf(session, | |
2563 | " };\n"); | |
2564 | if (ret) | |
2565 | goto end; | |
2566 | } | |
8070f5c0 MD |
2567 | |
2568 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2569 | " fields := struct {\n" |
2570 | ); | |
2571 | if (ret) | |
2572 | goto end; | |
2573 | ||
a90917c3 | 2574 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2575 | if (ret) |
2576 | goto end; | |
2577 | ||
2578 | /* | |
2579 | * LTTng space reservation can only reserve multiples of the | |
2580 | * byte size. | |
2581 | */ | |
2582 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2583 | " };\n" |
2584 | "};\n\n"); | |
c099397a MD |
2585 | if (ret) |
2586 | goto end; | |
2587 | ||
c099397a MD |
2588 | event->metadata_dumped = 1; |
2589 | end: | |
8b97fd42 | 2590 | lttng_metadata_end(session); |
c099397a MD |
2591 | return ret; |
2592 | ||
2593 | } | |
2594 | ||
d83004aa JD |
2595 | /* |
2596 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2597 | * The entire channel metadata is printed as a single atomic metadata |
2598 | * transaction. | |
d83004aa | 2599 | */ |
c099397a | 2600 | static |
a90917c3 MD |
2601 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2602 | struct lttng_channel *chan) | |
c099397a MD |
2603 | { |
2604 | int ret = 0; | |
2605 | ||
585e5dcc | 2606 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2607 | return 0; |
d83004aa JD |
2608 | |
2609 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2610 | return 0; |
2611 | ||
8b97fd42 MD |
2612 | lttng_metadata_begin(session); |
2613 | ||
c099397a MD |
2614 | WARN_ON_ONCE(!chan->header_type); |
2615 | ret = lttng_metadata_printf(session, | |
2616 | "stream {\n" | |
2617 | " id = %u;\n" | |
9115fbdc | 2618 | " event.header := %s;\n" |
b9074a1b | 2619 | " packet.context := struct packet_context;\n", |
c099397a MD |
2620 | chan->id, |
2621 | chan->header_type == 1 ? "struct event_header_compact" : | |
2622 | "struct event_header_large"); | |
2623 | if (ret) | |
2624 | goto end; | |
2625 | ||
b9074a1b MD |
2626 | if (chan->ctx) { |
2627 | ret = lttng_metadata_printf(session, | |
2628 | " event.context := struct {\n"); | |
2629 | if (ret) | |
2630 | goto end; | |
2631 | } | |
a90917c3 | 2632 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2633 | if (ret) |
2634 | goto end; | |
b9074a1b MD |
2635 | if (chan->ctx) { |
2636 | ret = lttng_metadata_printf(session, | |
2637 | " };\n"); | |
2638 | if (ret) | |
2639 | goto end; | |
2640 | } | |
8070f5c0 MD |
2641 | |
2642 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2643 | "};\n\n"); |
8070f5c0 | 2644 | |
c099397a MD |
2645 | chan->metadata_dumped = 1; |
2646 | end: | |
8b97fd42 | 2647 | lttng_metadata_end(session); |
c099397a MD |
2648 | return ret; |
2649 | } | |
2650 | ||
d83004aa JD |
2651 | /* |
2652 | * Must be called with sessions_mutex held. | |
2653 | */ | |
9115fbdc | 2654 | static |
a90917c3 | 2655 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2656 | { |
2657 | return lttng_metadata_printf(session, | |
2658 | "struct packet_context {\n" | |
a3ccff4f MD |
2659 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2660 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2661 | " uint64_t content_size;\n" |
2662 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2663 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2664 | " unsigned long events_discarded;\n" |
9115fbdc | 2665 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2666 | "};\n\n" |
9115fbdc MD |
2667 | ); |
2668 | } | |
2669 | ||
2670 | /* | |
2671 | * Compact header: | |
2672 | * id: range: 0 - 30. | |
2673 | * id 31 is reserved to indicate an extended header. | |
2674 | * | |
2675 | * Large header: | |
2676 | * id: range: 0 - 65534. | |
2677 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2678 | * |
2679 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2680 | */ |
2681 | static | |
a90917c3 | 2682 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2683 | { |
2684 | return lttng_metadata_printf(session, | |
2685 | "struct event_header_compact {\n" | |
2686 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2687 | " variant <id> {\n" | |
2688 | " struct {\n" | |
a3ccff4f | 2689 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2690 | " } compact;\n" |
2691 | " struct {\n" | |
2692 | " uint32_t id;\n" | |
a3ccff4f | 2693 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2694 | " } extended;\n" |
2695 | " } v;\n" | |
2696 | "} align(%u);\n" | |
2697 | "\n" | |
2698 | "struct event_header_large {\n" | |
2699 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2700 | " variant <id> {\n" | |
2701 | " struct {\n" | |
a3ccff4f | 2702 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2703 | " } compact;\n" |
2704 | " struct {\n" | |
2705 | " uint32_t id;\n" | |
a3ccff4f | 2706 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2707 | " } extended;\n" |
2708 | " } v;\n" | |
2709 | "} align(%u);\n\n", | |
a90917c3 MD |
2710 | lttng_alignof(uint32_t) * CHAR_BIT, |
2711 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2712 | ); |
2713 | } | |
2714 | ||
a3ccff4f MD |
2715 | /* |
2716 | * Approximation of NTP time of day to clock monotonic correlation, | |
2717 | * taken at start of trace. | |
2718 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2719 | * in future versions. | |
5283350b MD |
2720 | * This function may return a negative offset. It may happen if the |
2721 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2722 | * |
2723 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2724 | * y2038 compliant. | |
a3ccff4f MD |
2725 | */ |
2726 | static | |
8967b2a3 | 2727 | int64_t measure_clock_offset(void) |
a3ccff4f | 2728 | { |
dcb93448 | 2729 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2730 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2731 | int64_t offset; |
a3ccff4f | 2732 | unsigned long flags; |
3636085f MJ |
2733 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2734 | struct timespec64 rts = { 0, 0 }; | |
2735 | #else | |
2736 | struct timespec rts = { 0, 0 }; | |
2737 | #endif | |
a3ccff4f MD |
2738 | |
2739 | /* Disable interrupts to increase correlation precision. */ | |
2740 | local_irq_save(flags); | |
2741 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
2742 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2743 | ktime_get_real_ts64(&rts); | |
2744 | #else | |
216b6baa | 2745 | getnstimeofday(&rts); |
3636085f | 2746 | #endif |
a3ccff4f MD |
2747 | monotonic[1] = trace_clock_read64(); |
2748 | local_irq_restore(flags); | |
2749 | ||
dcb93448 | 2750 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2751 | realtime = (uint64_t) rts.tv_sec * tcf; |
2752 | if (tcf == NSEC_PER_SEC) { | |
2753 | realtime += rts.tv_nsec; | |
2754 | } else { | |
2755 | uint64_t n = rts.tv_nsec * tcf; | |
2756 | ||
2757 | do_div(n, NSEC_PER_SEC); | |
2758 | realtime += n; | |
2759 | } | |
dcb93448 | 2760 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2761 | return offset; |
2762 | } | |
2763 | ||
3eb95be4 JR |
2764 | static |
2765 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2766 | { | |
0f3eaad4 | 2767 | int ret = 0; |
3eb95be4 JR |
2768 | size_t i; |
2769 | char cur; | |
2770 | ||
2771 | i = 0; | |
2772 | cur = string[i]; | |
2773 | while (cur != '\0') { | |
2774 | switch (cur) { | |
2775 | case '\n': | |
2776 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2777 | break; | |
2778 | case '\\': | |
2779 | case '"': | |
2780 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2781 | if (ret) | |
2782 | goto error; | |
2783 | /* We still print the current char */ | |
2784 | /* Fallthrough */ | |
2785 | default: | |
2786 | ret = lttng_metadata_printf(session, "%c", cur); | |
2787 | break; | |
2788 | } | |
2789 | ||
2790 | if (ret) | |
2791 | goto error; | |
2792 | ||
2793 | cur = string[++i]; | |
2794 | } | |
2795 | error: | |
2796 | return ret; | |
2797 | } | |
2798 | ||
2799 | static | |
1c88f269 JR |
2800 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2801 | const char *field_value) | |
3eb95be4 JR |
2802 | { |
2803 | int ret; | |
2804 | ||
1c88f269 | 2805 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2806 | if (ret) |
2807 | goto error; | |
2808 | ||
1c88f269 | 2809 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2810 | if (ret) |
2811 | goto error; | |
2812 | ||
2813 | ret = lttng_metadata_printf(session, "\";\n"); | |
2814 | ||
2815 | error: | |
2816 | return ret; | |
2817 | } | |
2818 | ||
c099397a MD |
2819 | /* |
2820 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2821 | * Must be called with sessions_mutex held. |
c099397a MD |
2822 | */ |
2823 | static | |
a90917c3 | 2824 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2825 | { |
30bdb6e4 | 2826 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2827 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2828 | const char *product_uuid; |
a90917c3 MD |
2829 | struct lttng_channel *chan; |
2830 | struct lttng_event *event; | |
c099397a MD |
2831 | int ret = 0; |
2832 | ||
585e5dcc | 2833 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 2834 | return 0; |
8b97fd42 MD |
2835 | |
2836 | lttng_metadata_begin(session); | |
2837 | ||
c099397a MD |
2838 | if (session->metadata_dumped) |
2839 | goto skip_session; | |
c099397a | 2840 | |
d793d5e1 | 2841 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2842 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2843 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2844 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2845 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2846 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2847 | |
2848 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2849 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2850 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2851 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2852 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2853 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2854 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2855 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2856 | "\n" |
2857 | "trace {\n" | |
2858 | " major = %u;\n" | |
2859 | " minor = %u;\n" | |
30bdb6e4 | 2860 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2861 | " byte_order = %s;\n" |
2862 | " packet.header := struct {\n" | |
2863 | " uint32_t magic;\n" | |
1ec3f75a | 2864 | " uint8_t uuid[16];\n" |
d793d5e1 | 2865 | " uint32_t stream_id;\n" |
5594698f | 2866 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2867 | " };\n" |
d793d5e1 | 2868 | "};\n\n", |
a90917c3 MD |
2869 | lttng_alignof(uint8_t) * CHAR_BIT, |
2870 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2871 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2872 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2873 | sizeof(unsigned long) * CHAR_BIT, |
2874 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2875 | CTF_SPEC_MAJOR, |
2876 | CTF_SPEC_MINOR, | |
d793d5e1 | 2877 | uuid_s, |
5214fa50 | 2878 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2879 | "be" |
2880 | #else | |
2881 | "le" | |
2882 | #endif | |
2883 | ); | |
2884 | if (ret) | |
2885 | goto end; | |
2886 | ||
99dc9597 MD |
2887 | ret = lttng_metadata_printf(session, |
2888 | "env {\n" | |
a6058143 | 2889 | " hostname = \"%s\";\n" |
c6c9e10f | 2890 | " domain = \"kernel\";\n" |
99dc9597 | 2891 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2892 | " kernel_release = \"%s\";\n" |
2893 | " kernel_version = \"%s\";\n" | |
2894 | " tracer_name = \"lttng-modules\";\n" | |
2895 | " tracer_major = %d;\n" | |
2896 | " tracer_minor = %d;\n" | |
2897 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2898 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2899 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2900 | utsname()->sysname, |
2901 | utsname()->release, | |
c6c9e10f MD |
2902 | utsname()->version, |
2903 | LTTNG_MODULES_MAJOR_VERSION, | |
2904 | LTTNG_MODULES_MINOR_VERSION, | |
2905 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2906 | ); |
2907 | if (ret) | |
2908 | goto end; | |
2909 | ||
1c88f269 JR |
2910 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2911 | if (ret) | |
2912 | goto end; | |
2913 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2914 | session->creation_time); | |
3eb95be4 JR |
2915 | if (ret) |
2916 | goto end; | |
2917 | ||
c88f762e GB |
2918 | /* Add the product UUID to the 'env' section */ |
2919 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2920 | if (product_uuid) { | |
2921 | ret = lttng_metadata_printf(session, | |
2922 | " product_uuid = \"%s\";\n", | |
2923 | product_uuid | |
2924 | ); | |
2925 | if (ret) | |
2926 | goto end; | |
2927 | } | |
2928 | ||
2929 | /* Close the 'env' section */ | |
3eb95be4 JR |
2930 | ret = lttng_metadata_printf(session, "};\n\n"); |
2931 | if (ret) | |
2932 | goto end; | |
2933 | ||
a3ccff4f MD |
2934 | ret = lttng_metadata_printf(session, |
2935 | "clock {\n" | |
2754583e MD |
2936 | " name = \"%s\";\n", |
2937 | trace_clock_name() | |
a82c63f1 MD |
2938 | ); |
2939 | if (ret) | |
2940 | goto end; | |
2941 | ||
2942 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2943 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2944 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2945 | clock_uuid_s |
2946 | ); | |
2947 | if (ret) | |
2948 | goto end; | |
2949 | } | |
2950 | ||
2951 | ret = lttng_metadata_printf(session, | |
2754583e | 2952 | " description = \"%s\";\n" |
a3ccff4f MD |
2953 | " freq = %llu; /* Frequency, in Hz */\n" |
2954 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2955 | " offset = %lld;\n" |
a3ccff4f | 2956 | "};\n\n", |
2754583e | 2957 | trace_clock_description(), |
a3ccff4f | 2958 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2959 | (long long) measure_clock_offset() |
a3ccff4f MD |
2960 | ); |
2961 | if (ret) | |
2962 | goto end; | |
2963 | ||
2964 | ret = lttng_metadata_printf(session, | |
2965 | "typealias integer {\n" | |
2966 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2967 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2968 | "} := uint27_clock_monotonic_t;\n" |
2969 | "\n" | |
2970 | "typealias integer {\n" | |
2971 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2972 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2973 | "} := uint32_clock_monotonic_t;\n" |
2974 | "\n" | |
2975 | "typealias integer {\n" | |
2976 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2977 | " map = clock.%s.value;\n" |
a3ccff4f | 2978 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2979 | trace_clock_name(), |
a3ccff4f | 2980 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2981 | trace_clock_name(), |
2982 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2983 | trace_clock_name() | |
a3ccff4f MD |
2984 | ); |
2985 | if (ret) | |
2986 | goto end; | |
2987 | ||
a90917c3 | 2988 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2989 | if (ret) |
2990 | goto end; | |
2991 | ||
a90917c3 | 2992 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2993 | if (ret) |
2994 | goto end; | |
2995 | ||
c099397a MD |
2996 | skip_session: |
2997 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2998 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2999 | if (ret) |
3000 | goto end; | |
3001 | } | |
3002 | ||
3003 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3004 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3005 | if (ret) |
3006 | goto end; | |
3007 | } | |
3008 | session->metadata_dumped = 1; | |
3009 | end: | |
8b97fd42 | 3010 | lttng_metadata_end(session); |
c099397a MD |
3011 | return ret; |
3012 | } | |
3013 | ||
c0e31d2e | 3014 | /** |
a90917c3 | 3015 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3016 | * @transport: transport structure |
3017 | * | |
3018 | * Registers a transport which can be used as output to extract the data out of | |
3019 | * LTTng. The module calling this registration function must ensure that no | |
3020 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3021 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3022 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3023 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3024 | * after its registration must it synchronize the TLBs. |
3025 | */ | |
a90917c3 | 3026 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3027 | { |
3028 | /* | |
3029 | * Make sure no page fault can be triggered by the module about to be | |
3030 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3031 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3032 | */ |
263b6c88 | 3033 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3034 | |
3035 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3036 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3037 | mutex_unlock(&sessions_mutex); |
3038 | } | |
a90917c3 | 3039 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3040 | |
3041 | /** | |
a90917c3 | 3042 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3043 | * @transport: transport structure |
3044 | */ | |
a90917c3 | 3045 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3046 | { |
3047 | mutex_lock(&sessions_mutex); | |
3048 | list_del(&transport->node); | |
3049 | mutex_unlock(&sessions_mutex); | |
3050 | } | |
a90917c3 | 3051 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3052 | |
894ce5dc | 3053 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3054 | |
3055 | enum cpuhp_state lttng_hp_prepare; | |
3056 | enum cpuhp_state lttng_hp_online; | |
3057 | ||
3058 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3059 | { | |
3060 | struct lttng_cpuhp_node *lttng_node; | |
3061 | ||
3062 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3063 | switch (lttng_node->component) { | |
3064 | case LTTNG_RING_BUFFER_FRONTEND: | |
3065 | return 0; | |
3066 | case LTTNG_RING_BUFFER_BACKEND: | |
3067 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3068 | case LTTNG_RING_BUFFER_ITER: | |
3069 | return 0; | |
3070 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3071 | return 0; | |
3072 | default: | |
3073 | return -EINVAL; | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3078 | { | |
3079 | struct lttng_cpuhp_node *lttng_node; | |
3080 | ||
3081 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3082 | switch (lttng_node->component) { | |
3083 | case LTTNG_RING_BUFFER_FRONTEND: | |
3084 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3085 | case LTTNG_RING_BUFFER_BACKEND: | |
3086 | return 0; | |
3087 | case LTTNG_RING_BUFFER_ITER: | |
3088 | return 0; | |
3089 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3090 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3091 | default: | |
3092 | return -EINVAL; | |
3093 | } | |
3094 | } | |
3095 | ||
3096 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3097 | { | |
3098 | struct lttng_cpuhp_node *lttng_node; | |
3099 | ||
3100 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3101 | switch (lttng_node->component) { | |
3102 | case LTTNG_RING_BUFFER_FRONTEND: | |
3103 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3104 | case LTTNG_RING_BUFFER_BACKEND: | |
3105 | return 0; | |
3106 | case LTTNG_RING_BUFFER_ITER: | |
3107 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3108 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3109 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3110 | default: | |
3111 | return -EINVAL; | |
3112 | } | |
3113 | } | |
3114 | ||
3115 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3116 | { | |
3117 | struct lttng_cpuhp_node *lttng_node; | |
3118 | ||
3119 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3120 | switch (lttng_node->component) { | |
3121 | case LTTNG_RING_BUFFER_FRONTEND: | |
3122 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3123 | case LTTNG_RING_BUFFER_BACKEND: | |
3124 | return 0; | |
3125 | case LTTNG_RING_BUFFER_ITER: | |
3126 | return 0; | |
3127 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3128 | return 0; | |
3129 | default: | |
3130 | return -EINVAL; | |
3131 | } | |
3132 | } | |
3133 | ||
3134 | static int __init lttng_init_cpu_hotplug(void) | |
3135 | { | |
3136 | int ret; | |
3137 | ||
3138 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3139 | lttng_hotplug_prepare, | |
3140 | lttng_hotplug_dead); | |
3141 | if (ret < 0) { | |
3142 | return ret; | |
3143 | } | |
3144 | lttng_hp_prepare = ret; | |
3145 | lttng_rb_set_hp_prepare(ret); | |
3146 | ||
3147 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3148 | lttng_hotplug_online, | |
3149 | lttng_hotplug_offline); | |
3150 | if (ret < 0) { | |
3151 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3152 | lttng_hp_prepare = 0; | |
3153 | return ret; | |
3154 | } | |
3155 | lttng_hp_online = ret; | |
3156 | lttng_rb_set_hp_online(ret); | |
3157 | ||
3158 | return 0; | |
3159 | } | |
3160 | ||
3161 | static void __exit lttng_exit_cpu_hotplug(void) | |
3162 | { | |
3163 | lttng_rb_set_hp_online(0); | |
3164 | cpuhp_remove_multi_state(lttng_hp_online); | |
3165 | lttng_rb_set_hp_prepare(0); | |
3166 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3167 | } | |
3168 | ||
1ee63d8d | 3169 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3170 | static int lttng_init_cpu_hotplug(void) |
3171 | { | |
3172 | return 0; | |
3173 | } | |
3174 | static void lttng_exit_cpu_hotplug(void) | |
3175 | { | |
3176 | } | |
1ee63d8d | 3177 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3178 | |
3179 | ||
a90917c3 | 3180 | static int __init lttng_events_init(void) |
4e3c1b9b | 3181 | { |
1c25284c MD |
3182 | int ret; |
3183 | ||
453b2495 JD |
3184 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3185 | if (ret) | |
3186 | return ret; | |
389d7070 | 3187 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3188 | if (ret) |
3189 | return ret; | |
3190 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3191 | if (ret) |
3192 | return ret; | |
3193 | ret = lttng_probes_init(); | |
389d7070 MD |
3194 | if (ret) |
3195 | return ret; | |
07dfc1d0 | 3196 | ret = lttng_context_init(); |
20591cf7 MD |
3197 | if (ret) |
3198 | return ret; | |
07dfc1d0 MD |
3199 | ret = lttng_tracepoint_init(); |
3200 | if (ret) | |
3201 | goto error_tp; | |
a90917c3 | 3202 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3203 | if (!event_cache) { |
3204 | ret = -ENOMEM; | |
3205 | goto error_kmem; | |
3206 | } | |
80996790 | 3207 | ret = lttng_abi_init(); |
02119ee5 MD |
3208 | if (ret) |
3209 | goto error_abi; | |
0c956676 MD |
3210 | ret = lttng_logger_init(); |
3211 | if (ret) | |
3212 | goto error_logger; | |
1e367326 MD |
3213 | ret = lttng_init_cpu_hotplug(); |
3214 | if (ret) | |
3215 | goto error_hotplug; | |
101215b7 | 3216 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3217 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3218 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3219 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3220 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3221 | LTTNG_VERSION_NAME, |
3222 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3223 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3224 | #else | |
3225 | "", | |
3226 | #endif | |
3227 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3228 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3229 | #else | |
3230 | ""); | |
3231 | #endif | |
4e3c1b9b | 3232 | return 0; |
0c956676 | 3233 | |
1e367326 MD |
3234 | error_hotplug: |
3235 | lttng_logger_exit(); | |
0c956676 MD |
3236 | error_logger: |
3237 | lttng_abi_exit(); | |
02119ee5 | 3238 | error_abi: |
1c25284c | 3239 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3240 | error_kmem: |
3241 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3242 | error_tp: |
3243 | lttng_context_exit(); | |
101215b7 | 3244 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3245 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3246 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3247 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3248 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3249 | LTTNG_VERSION_NAME, |
3250 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3251 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3252 | #else | |
3253 | "", | |
3254 | #endif | |
3255 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3256 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3257 | #else | |
3258 | ""); | |
3259 | #endif | |
1c25284c | 3260 | return ret; |
4e3c1b9b MD |
3261 | } |
3262 | ||
a90917c3 | 3263 | module_init(lttng_events_init); |
11b5a3c2 | 3264 | |
a90917c3 | 3265 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3266 | { |
a90917c3 | 3267 | struct lttng_session *session, *tmpsession; |
92e94819 | 3268 | |
1e367326 | 3269 | lttng_exit_cpu_hotplug(); |
0c956676 | 3270 | lttng_logger_exit(); |
80996790 | 3271 | lttng_abi_exit(); |
92e94819 | 3272 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3273 | lttng_session_destroy(session); |
11b5a3c2 | 3274 | kmem_cache_destroy(event_cache); |
20591cf7 | 3275 | lttng_tracepoint_exit(); |
07dfc1d0 | 3276 | lttng_context_exit(); |
101215b7 | 3277 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3278 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3279 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3280 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3281 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3282 | LTTNG_VERSION_NAME, |
3283 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3284 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3285 | #else | |
3286 | "", | |
3287 | #endif | |
3288 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3289 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3290 | #else | |
3291 | ""); | |
3292 | #endif | |
4e3c1b9b | 3293 | } |
92e94819 | 3294 | |
a90917c3 | 3295 | module_exit(lttng_events_exit); |
11b5a3c2 | 3296 | |
7ca11e77 | 3297 | #include <generated/patches.h> |
101215b7 MJ |
3298 | #ifdef LTTNG_EXTRA_VERSION_GIT |
3299 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3300 | #endif | |
3301 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3302 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3303 | #endif | |
92e94819 MD |
3304 | MODULE_LICENSE("GPL and additional rights"); |
3305 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3306 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3307 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3308 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3309 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3310 | LTTNG_MODULES_EXTRAVERSION); |