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> | |
0b365677 | 39 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 40 | #include <lttng/tracer.h> |
21f58fb7 | 41 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
42 | #include <lttng/abi-old.h> |
43 | #include <lttng/endian.h> | |
44 | #include <lttng/string-utils.h> | |
4a11ef1c | 45 | #include <lttng/utils.h> |
24591303 MD |
46 | #include <ringbuffer/backend.h> |
47 | #include <ringbuffer/frontend.h> | |
3636085f | 48 | #include <wrapper/time.h> |
4e3c1b9b | 49 | |
d83004aa JD |
50 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
51 | ||
4e3c1b9b | 52 | static LIST_HEAD(sessions); |
750b05f2 | 53 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 54 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 55 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
56 | /* |
57 | * Protect the sessions and metadata caches. | |
58 | */ | |
4e3c1b9b MD |
59 | static DEFINE_MUTEX(sessions_mutex); |
60 | static struct kmem_cache *event_cache; | |
dffef45d | 61 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 62 | |
b2bc0bc8 FD |
63 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
64 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
65 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 66 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 67 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 68 | |
a90917c3 | 69 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 70 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
71 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
72 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 73 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 74 | static |
a90917c3 MD |
75 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
76 | struct lttng_channel *chan, | |
77 | struct lttng_event *event); | |
c099397a | 78 | static |
a90917c3 | 79 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
80 | static |
81 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 82 | static |
ceabb767 MD |
83 | int _lttng_type_statedump(struct lttng_session *session, |
84 | const struct lttng_type *type, | |
85 | size_t nesting); | |
86 | static | |
f513b2bf MD |
87 | int _lttng_field_statedump(struct lttng_session *session, |
88 | const struct lttng_event_field *field, | |
89 | size_t nesting); | |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
92da05ce MJ |
93 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
94 | synchronize_rcu(); | |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
92da05ce MJ |
97 | #endif |
98 | ||
b8590f40 MD |
99 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
100 | #ifdef CONFIG_PREEMPT_RT_FULL | |
101 | synchronize_rcu(); | |
102 | #endif | |
103 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
b8590f40 | 107 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
9fe593d2 FD |
120 | static struct lttng_transport *lttng_transport_find(const char *name) |
121 | { | |
122 | struct lttng_transport *transport; | |
123 | ||
124 | list_for_each_entry(transport, <tng_transport_list, node) { | |
125 | if (!strcmp(transport->name, name)) | |
126 | return transport; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
3c997079 MD |
131 | /* |
132 | * Called with sessions lock held. | |
133 | */ | |
134 | int lttng_session_active(void) | |
135 | { | |
136 | struct lttng_session *iter; | |
137 | ||
138 | list_for_each_entry(iter, &sessions, list) { | |
139 | if (iter->active) | |
140 | return 1; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
a90917c3 | 145 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 146 | { |
a90917c3 | 147 | struct lttng_session *session; |
d83004aa | 148 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 149 | int i; |
4e3c1b9b MD |
150 | |
151 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 152 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 153 | if (!session) |
d83004aa | 154 | goto err; |
4e3c1b9b | 155 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 156 | INIT_LIST_HEAD(&session->events); |
a7008254 | 157 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
158 | |
159 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
160 | GFP_KERNEL); | |
161 | if (!metadata_cache) | |
162 | goto err_free_session; | |
0ca42eb7 | 163 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
164 | if (!metadata_cache->data) |
165 | goto err_free_cache; | |
166 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
167 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 168 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
169 | session->metadata_cache = metadata_cache; |
170 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
171 | memcpy(&metadata_cache->uuid, &session->uuid, |
172 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
173 | INIT_LIST_HEAD(&session->enablers_head); |
174 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
175 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 176 | list_add(&session->list, &sessions); |
d1f652f8 MD |
177 | session->pid_tracker.session = session; |
178 | session->pid_tracker.tracker_type = TRACKER_PID; | |
179 | session->vpid_tracker.session = session; | |
180 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
181 | session->uid_tracker.session = session; | |
182 | session->uid_tracker.tracker_type = TRACKER_UID; | |
183 | session->vuid_tracker.session = session; | |
184 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
185 | session->gid_tracker.session = session; | |
186 | session->gid_tracker.tracker_type = TRACKER_GID; | |
187 | session->vgid_tracker.session = session; | |
188 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
189 | mutex_unlock(&sessions_mutex); |
190 | return session; | |
d83004aa JD |
191 | |
192 | err_free_cache: | |
193 | kfree(metadata_cache); | |
194 | err_free_session: | |
48f5e0b5 | 195 | lttng_kvfree(session); |
d83004aa JD |
196 | err: |
197 | mutex_unlock(&sessions_mutex); | |
198 | return NULL; | |
199 | } | |
200 | ||
99f52fcc FD |
201 | static |
202 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
203 | { | |
204 | struct lttng_counter_transport *transport; | |
205 | ||
206 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
207 | if (!strcmp(transport->name, name)) | |
208 | return transport; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | struct lttng_counter *lttng_kernel_counter_create( | |
214 | const char *counter_transport_name, | |
215 | size_t number_dimensions, const size_t *dimensions_sizes) | |
216 | { | |
217 | struct lttng_counter *counter = NULL; | |
218 | struct lttng_counter_transport *counter_transport = NULL; | |
219 | ||
220 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
221 | if (!counter_transport) { | |
222 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
223 | counter_transport_name); | |
224 | goto notransport; | |
225 | } | |
226 | if (!try_module_get(counter_transport->owner)) { | |
227 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
228 | goto notransport; | |
229 | } | |
230 | ||
231 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
232 | if (!counter) | |
233 | goto nomem; | |
234 | ||
235 | /* Create event notifier error counter. */ | |
236 | counter->ops = &counter_transport->ops; | |
237 | counter->transport = counter_transport; | |
238 | ||
239 | counter->counter = counter->ops->counter_create( | |
240 | number_dimensions, dimensions_sizes, 0); | |
241 | if (!counter->counter) { | |
242 | goto create_error; | |
243 | } | |
244 | ||
245 | return counter; | |
246 | ||
247 | create_error: | |
248 | lttng_kvfree(counter); | |
249 | nomem: | |
250 | if (counter_transport) | |
251 | module_put(counter_transport->owner); | |
252 | notransport: | |
253 | return NULL; | |
254 | } | |
255 | ||
750b05f2 FD |
256 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
257 | { | |
258 | struct lttng_transport *transport = NULL; | |
259 | struct lttng_event_notifier_group *event_notifier_group; | |
260 | const char *transport_name = "relay-event-notifier"; | |
261 | size_t subbuf_size = 4096; //TODO | |
262 | size_t num_subbuf = 16; //TODO | |
263 | unsigned int switch_timer_interval = 0; | |
264 | unsigned int read_timer_interval = 0; | |
dffef45d | 265 | int i; |
750b05f2 FD |
266 | |
267 | mutex_lock(&sessions_mutex); | |
268 | ||
269 | transport = lttng_transport_find(transport_name); | |
270 | if (!transport) { | |
271 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
272 | transport_name); | |
273 | goto notransport; | |
274 | } | |
275 | if (!try_module_get(transport->owner)) { | |
276 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
277 | transport_name); | |
278 | goto notransport; | |
279 | } | |
280 | ||
281 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
282 | GFP_KERNEL); | |
283 | if (!event_notifier_group) | |
284 | goto nomem; | |
285 | ||
286 | /* | |
287 | * Initialize the ring buffer used to store event notifier | |
288 | * notifications. | |
289 | */ | |
290 | event_notifier_group->ops = &transport->ops; | |
291 | event_notifier_group->chan = transport->ops.channel_create( | |
292 | transport_name, event_notifier_group, NULL, | |
293 | subbuf_size, num_subbuf, switch_timer_interval, | |
294 | read_timer_interval); | |
295 | if (!event_notifier_group->chan) | |
296 | goto create_error; | |
297 | ||
298 | event_notifier_group->transport = transport; | |
dffef45d FD |
299 | |
300 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
301 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
302 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
303 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
304 | ||
750b05f2 FD |
305 | list_add(&event_notifier_group->node, &event_notifier_groups); |
306 | ||
307 | mutex_unlock(&sessions_mutex); | |
308 | ||
309 | return event_notifier_group; | |
310 | ||
311 | create_error: | |
312 | lttng_kvfree(event_notifier_group); | |
313 | nomem: | |
314 | if (transport) | |
315 | module_put(transport->owner); | |
316 | notransport: | |
317 | mutex_unlock(&sessions_mutex); | |
318 | return NULL; | |
319 | } | |
320 | ||
d83004aa JD |
321 | void metadata_cache_destroy(struct kref *kref) |
322 | { | |
323 | struct lttng_metadata_cache *cache = | |
324 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 325 | vfree(cache->data); |
d83004aa | 326 | kfree(cache); |
4e3c1b9b MD |
327 | } |
328 | ||
a90917c3 | 329 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 330 | { |
a90917c3 MD |
331 | struct lttng_channel *chan, *tmpchan; |
332 | struct lttng_event *event, *tmpevent; | |
d83004aa | 333 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 334 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 335 | int ret; |
4e3c1b9b MD |
336 | |
337 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 338 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 339 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 340 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
341 | WARN_ON(ret); |
342 | } | |
dda6a249 | 343 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 344 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
345 | WARN_ON(ret); |
346 | } | |
abcca994 | 347 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 348 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 349 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
350 | WARN_ON(ret); |
351 | } | |
b2bc0bc8 | 352 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 353 | &session->enablers_head, node) |
b2bc0bc8 | 354 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 355 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 356 | _lttng_event_destroy(event); |
d83004aa JD |
357 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
358 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 359 | _lttng_channel_destroy(chan); |
d83004aa | 360 | } |
ab036a63 | 361 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
362 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
363 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 364 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
365 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
366 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
367 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
368 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
369 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 371 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
372 | list_del(&session->list); |
373 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 374 | lttng_kvfree(session); |
4e3c1b9b MD |
375 | } |
376 | ||
dffef45d FD |
377 | void lttng_event_notifier_group_destroy( |
378 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 379 | { |
dffef45d FD |
380 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
381 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
382 | int ret; | |
383 | ||
750b05f2 FD |
384 | if (!event_notifier_group) |
385 | return; | |
386 | ||
387 | mutex_lock(&sessions_mutex); | |
dffef45d | 388 | |
3b82c4e1 | 389 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
390 | WARN_ON(ret); |
391 | ||
dffef45d FD |
392 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
393 | &event_notifier_group->event_notifiers_head, list) { | |
394 | ret = _lttng_event_notifier_unregister(event_notifier); | |
395 | WARN_ON(ret); | |
396 | } | |
397 | ||
b01155ba FD |
398 | /* Wait for in-flight event notifier to complete */ |
399 | synchronize_trace(); | |
400 | ||
21f58fb7 FD |
401 | irq_work_sync(&event_notifier_group->wakeup_pending); |
402 | ||
8a8ac9a8 FD |
403 | kfree(event_notifier_group->sc_filter); |
404 | ||
dffef45d FD |
405 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
406 | &event_notifier_group->enablers_head, node) | |
407 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
408 | ||
409 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
410 | &event_notifier_group->event_notifiers_head, list) | |
411 | _lttng_event_notifier_destroy(event_notifier); | |
412 | ||
99f52fcc FD |
413 | if (event_notifier_group->error_counter) { |
414 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
415 | error_counter->ops->counter_destroy(error_counter->counter); | |
416 | module_put(error_counter->transport->owner); | |
417 | lttng_kvfree(error_counter); | |
418 | event_notifier_group->error_counter = NULL; | |
419 | } | |
420 | ||
750b05f2 FD |
421 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
422 | module_put(event_notifier_group->transport->owner); | |
423 | list_del(&event_notifier_group->node); | |
dffef45d | 424 | |
750b05f2 FD |
425 | mutex_unlock(&sessions_mutex); |
426 | lttng_kvfree(event_notifier_group); | |
427 | } | |
428 | ||
601252cf MD |
429 | int lttng_session_statedump(struct lttng_session *session) |
430 | { | |
431 | int ret; | |
432 | ||
433 | mutex_lock(&sessions_mutex); | |
434 | ret = lttng_statedump_start(session); | |
435 | mutex_unlock(&sessions_mutex); | |
436 | return ret; | |
437 | } | |
438 | ||
a90917c3 | 439 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
440 | { |
441 | int ret = 0; | |
a90917c3 | 442 | struct lttng_channel *chan; |
c0e31d2e MD |
443 | |
444 | mutex_lock(&sessions_mutex); | |
445 | if (session->active) { | |
446 | ret = -EBUSY; | |
447 | goto end; | |
448 | } | |
c099397a | 449 | |
3c997079 MD |
450 | /* Set transient enabler state to "enabled" */ |
451 | session->tstate = 1; | |
452 | ||
4ef81e4a | 453 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 454 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 455 | |
c099397a MD |
456 | /* |
457 | * Snapshot the number of events per channel to know the type of header | |
458 | * we need to use. | |
459 | */ | |
460 | list_for_each_entry(chan, &session->chan, list) { | |
461 | if (chan->header_type) | |
462 | continue; /* don't change it if session stop/restart */ | |
463 | if (chan->free_event_id < 31) | |
464 | chan->header_type = 1; /* compact */ | |
465 | else | |
466 | chan->header_type = 2; /* large */ | |
467 | } | |
468 | ||
64af2437 | 469 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
470 | list_for_each_entry(chan, &session->chan, list) { |
471 | if (chan->channel_type != METADATA_CHANNEL) | |
472 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
473 | } | |
64af2437 | 474 | |
a8f2d0c7 MJ |
475 | WRITE_ONCE(session->active, 1); |
476 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 477 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 478 | if (ret) { |
a8f2d0c7 | 479 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
480 | goto end; |
481 | } | |
482 | ret = lttng_statedump_start(session); | |
360f38ea | 483 | if (ret) |
a8f2d0c7 | 484 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
485 | end: |
486 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 487 | return ret; |
c0e31d2e MD |
488 | } |
489 | ||
a90917c3 | 490 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
491 | { |
492 | int ret = 0; | |
64af2437 | 493 | struct lttng_channel *chan; |
c0e31d2e MD |
494 | |
495 | mutex_lock(&sessions_mutex); | |
496 | if (!session->active) { | |
497 | ret = -EBUSY; | |
498 | goto end; | |
499 | } | |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
501 | |
502 | /* Set transient enabler state to "disabled" */ | |
503 | session->tstate = 0; | |
b2bc0bc8 | 504 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
505 | |
506 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
507 | list_for_each_entry(chan, &session->chan, list) { |
508 | if (chan->channel_type != METADATA_CHANNEL) | |
509 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
510 | } | |
c0e31d2e MD |
511 | end: |
512 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 513 | return ret; |
c0e31d2e MD |
514 | } |
515 | ||
9616f0bf JD |
516 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
517 | { | |
518 | int ret = 0; | |
519 | struct lttng_channel *chan; | |
520 | struct lttng_event *event; | |
521 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
522 | struct lttng_metadata_stream *stream; | |
523 | ||
524 | mutex_lock(&sessions_mutex); | |
525 | if (!session->active) { | |
526 | ret = -EBUSY; | |
527 | goto end; | |
528 | } | |
529 | ||
530 | mutex_lock(&cache->lock); | |
531 | memset(cache->data, 0, cache->cache_alloc); | |
532 | cache->metadata_written = 0; | |
533 | cache->version++; | |
534 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
535 | stream->metadata_out = 0; | |
536 | stream->metadata_in = 0; | |
537 | } | |
538 | mutex_unlock(&cache->lock); | |
539 | ||
540 | session->metadata_dumped = 0; | |
541 | list_for_each_entry(chan, &session->chan, list) { | |
542 | chan->metadata_dumped = 0; | |
543 | } | |
544 | ||
545 | list_for_each_entry(event, &session->events, list) { | |
546 | event->metadata_dumped = 0; | |
547 | } | |
548 | ||
549 | ret = _lttng_session_metadata_statedump(session); | |
550 | ||
551 | end: | |
552 | mutex_unlock(&sessions_mutex); | |
553 | return ret; | |
554 | } | |
555 | ||
a90917c3 | 556 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 557 | { |
3c997079 | 558 | int ret = 0; |
e64957da | 559 | |
3c997079 MD |
560 | mutex_lock(&sessions_mutex); |
561 | if (channel->channel_type == METADATA_CHANNEL) { | |
562 | ret = -EPERM; | |
563 | goto end; | |
564 | } | |
565 | if (channel->enabled) { | |
566 | ret = -EEXIST; | |
567 | goto end; | |
568 | } | |
569 | /* Set transient enabler state to "enabled" */ | |
570 | channel->tstate = 1; | |
b2bc0bc8 | 571 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 572 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 573 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
574 | end: |
575 | mutex_unlock(&sessions_mutex); | |
576 | return ret; | |
e64957da MD |
577 | } |
578 | ||
a90917c3 | 579 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 580 | { |
3c997079 | 581 | int ret = 0; |
e64957da | 582 | |
3c997079 MD |
583 | mutex_lock(&sessions_mutex); |
584 | if (channel->channel_type == METADATA_CHANNEL) { | |
585 | ret = -EPERM; | |
586 | goto end; | |
587 | } | |
588 | if (!channel->enabled) { | |
589 | ret = -EEXIST; | |
590 | goto end; | |
591 | } | |
592 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 593 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
594 | /* Set transient enabler state to "enabled" */ |
595 | channel->tstate = 0; | |
b2bc0bc8 | 596 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
597 | end: |
598 | mutex_unlock(&sessions_mutex); | |
599 | return ret; | |
e64957da MD |
600 | } |
601 | ||
a90917c3 | 602 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 603 | { |
3c997079 | 604 | int ret = 0; |
e64957da | 605 | |
3c997079 MD |
606 | mutex_lock(&sessions_mutex); |
607 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
608 | ret = -EPERM; | |
609 | goto end; | |
610 | } | |
611 | if (event->enabled) { | |
612 | ret = -EEXIST; | |
613 | goto end; | |
614 | } | |
a0493bef MD |
615 | switch (event->instrumentation) { |
616 | case LTTNG_KERNEL_TRACEPOINT: | |
617 | case LTTNG_KERNEL_SYSCALL: | |
618 | ret = -EINVAL; | |
619 | break; | |
620 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 621 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 622 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 623 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
624 | break; |
625 | case LTTNG_KERNEL_KRETPROBE: | |
626 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
627 | break; | |
e884017c | 628 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
629 | default: |
630 | WARN_ON_ONCE(1); | |
631 | ret = -EINVAL; | |
632 | } | |
3c997079 MD |
633 | end: |
634 | mutex_unlock(&sessions_mutex); | |
635 | return ret; | |
e64957da MD |
636 | } |
637 | ||
a90917c3 | 638 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 639 | { |
3c997079 | 640 | int ret = 0; |
e64957da | 641 | |
3c997079 MD |
642 | mutex_lock(&sessions_mutex); |
643 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
644 | ret = -EPERM; | |
645 | goto end; | |
646 | } | |
647 | if (!event->enabled) { | |
648 | ret = -EEXIST; | |
649 | goto end; | |
650 | } | |
a0493bef MD |
651 | switch (event->instrumentation) { |
652 | case LTTNG_KERNEL_TRACEPOINT: | |
653 | case LTTNG_KERNEL_SYSCALL: | |
654 | ret = -EINVAL; | |
655 | break; | |
656 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 657 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 658 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 659 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
660 | break; |
661 | case LTTNG_KERNEL_KRETPROBE: | |
662 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
663 | break; | |
e884017c | 664 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
665 | default: |
666 | WARN_ON_ONCE(1); | |
667 | ret = -EINVAL; | |
668 | } | |
3c997079 MD |
669 | end: |
670 | mutex_unlock(&sessions_mutex); | |
671 | return ret; | |
e64957da MD |
672 | } |
673 | ||
dffef45d FD |
674 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
675 | { | |
676 | int ret = 0; | |
677 | ||
678 | mutex_lock(&sessions_mutex); | |
679 | if (event_notifier->enabled) { | |
680 | ret = -EEXIST; | |
681 | goto end; | |
682 | } | |
683 | switch (event_notifier->instrumentation) { | |
684 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 685 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
686 | ret = -EINVAL; |
687 | break; | |
dffef45d | 688 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 689 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
690 | WRITE_ONCE(event_notifier->enabled, 1); |
691 | break; | |
dffef45d | 692 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
693 | case LTTNG_KERNEL_NOOP: |
694 | case LTTNG_KERNEL_KRETPROBE: | |
695 | default: | |
696 | WARN_ON_ONCE(1); | |
697 | ret = -EINVAL; | |
698 | } | |
699 | end: | |
700 | mutex_unlock(&sessions_mutex); | |
701 | return ret; | |
702 | } | |
703 | ||
704 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
705 | { | |
706 | int ret = 0; | |
707 | ||
708 | mutex_lock(&sessions_mutex); | |
709 | if (!event_notifier->enabled) { | |
710 | ret = -EEXIST; | |
711 | goto end; | |
712 | } | |
713 | switch (event_notifier->instrumentation) { | |
714 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 715 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
716 | ret = -EINVAL; |
717 | break; | |
dffef45d | 718 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 719 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
720 | WRITE_ONCE(event_notifier->enabled, 0); |
721 | break; | |
dffef45d | 722 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
723 | case LTTNG_KERNEL_NOOP: |
724 | case LTTNG_KERNEL_KRETPROBE: | |
725 | default: | |
726 | WARN_ON_ONCE(1); | |
727 | ret = -EINVAL; | |
728 | } | |
729 | end: | |
730 | mutex_unlock(&sessions_mutex); | |
731 | return ret; | |
732 | } | |
733 | ||
a90917c3 | 734 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
735 | const char *transport_name, |
736 | void *buf_addr, | |
4e3c1b9b MD |
737 | size_t subbuf_size, size_t num_subbuf, |
738 | unsigned int switch_timer_interval, | |
d83004aa JD |
739 | unsigned int read_timer_interval, |
740 | enum channel_type channel_type) | |
4e3c1b9b | 741 | { |
a90917c3 MD |
742 | struct lttng_channel *chan; |
743 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
744 | |
745 | mutex_lock(&sessions_mutex); | |
d83004aa | 746 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 747 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 748 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 749 | if (!transport) { |
5a15f70c | 750 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 751 | transport_name); |
c0e31d2e | 752 | goto notransport; |
f3d01b96 | 753 | } |
a33c9927 | 754 | if (!try_module_get(transport->owner)) { |
5a15f70c | 755 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
756 | goto notransport; |
757 | } | |
a90917c3 | 758 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 759 | if (!chan) |
c0e31d2e | 760 | goto nomem; |
4e3c1b9b | 761 | chan->session = session; |
05d32c64 | 762 | chan->id = session->free_chan_id++; |
3b731ab1 | 763 | chan->ops = &transport->ops; |
125b4df4 MD |
764 | /* |
765 | * Note: the channel creation op already writes into the packet | |
766 | * headers. Therefore the "chan" information used as input | |
767 | * should be already accessible. | |
768 | */ | |
5f5ddf01 MD |
769 | chan->chan = transport->ops.channel_create(transport_name, |
770 | chan, buf_addr, subbuf_size, num_subbuf, | |
771 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
772 | if (!chan->chan) |
773 | goto create_error; | |
3c997079 | 774 | chan->tstate = 1; |
e64957da | 775 | chan->enabled = 1; |
a33c9927 | 776 | chan->transport = transport; |
d83004aa | 777 | chan->channel_type = channel_type; |
4e3c1b9b MD |
778 | list_add(&chan->list, &session->chan); |
779 | mutex_unlock(&sessions_mutex); | |
780 | return chan; | |
781 | ||
f3d01b96 MD |
782 | create_error: |
783 | kfree(chan); | |
c0e31d2e | 784 | nomem: |
a33c9927 MD |
785 | if (transport) |
786 | module_put(transport->owner); | |
c0e31d2e | 787 | notransport: |
e5382b6d | 788 | active: |
4e3c1b9b MD |
789 | mutex_unlock(&sessions_mutex); |
790 | return NULL; | |
791 | } | |
792 | ||
793 | /* | |
d83004aa JD |
794 | * Only used internally at session destruction for per-cpu channels, and |
795 | * when metadata channel is released. | |
796 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 797 | */ |
aa7c23a9 | 798 | static |
a90917c3 | 799 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 800 | { |
11b5a3c2 | 801 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 802 | module_put(chan->transport->owner); |
4e3c1b9b | 803 | list_del(&chan->list); |
8070f5c0 | 804 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
805 | kfree(chan); |
806 | } | |
807 | ||
d83004aa JD |
808 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
809 | { | |
810 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
811 | ||
812 | /* Protect the metadata cache with the sessions_mutex. */ | |
813 | mutex_lock(&sessions_mutex); | |
814 | _lttng_channel_destroy(chan); | |
815 | mutex_unlock(&sessions_mutex); | |
816 | } | |
817 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
818 | ||
819 | static | |
820 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
821 | { | |
822 | stream->finalized = 1; | |
823 | wake_up_interruptible(&stream->read_wait); | |
824 | } | |
825 | ||
a101fa10 | 826 | |
e5382b6d MD |
827 | /* |
828 | * Supports event creation while tracing session is active. | |
3c997079 | 829 | * Needs to be called with sessions mutex held. |
e5382b6d | 830 | */ |
3c997079 MD |
831 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
832 | struct lttng_kernel_event *event_param, | |
833 | void *filter, | |
834 | const struct lttng_event_desc *event_desc, | |
835 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 836 | { |
3c997079 | 837 | struct lttng_session *session = chan->session; |
a90917c3 | 838 | struct lttng_event *event; |
3c997079 MD |
839 | const char *event_name; |
840 | struct hlist_head *head; | |
3d084699 | 841 | int ret; |
4e3c1b9b | 842 | |
abc0446a | 843 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 844 | ret = -EMFILE; |
e5382b6d | 845 | goto full; |
abc0446a | 846 | } |
3c997079 MD |
847 | |
848 | switch (itype) { | |
849 | case LTTNG_KERNEL_TRACEPOINT: | |
850 | event_name = event_desc->name; | |
851 | break; | |
852 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 853 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 854 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 855 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 856 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
857 | event_name = event_param->name; |
858 | break; | |
e884017c | 859 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
860 | default: |
861 | WARN_ON_ONCE(1); | |
862 | ret = -EINVAL; | |
863 | goto type_error; | |
864 | } | |
4a11ef1c FD |
865 | |
866 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
867 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 868 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
869 | WARN_ON_ONCE(!event->desc); |
870 | if (!strncmp(event->desc->name, event_name, | |
871 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
872 | && chan == event->chan) { | |
873 | ret = -EEXIST; | |
874 | goto exist; | |
abc0446a MD |
875 | } |
876 | } | |
3c997079 | 877 | |
11b5a3c2 | 878 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 879 | if (!event) { |
4cf0bf51 | 880 | ret = -ENOMEM; |
4e3c1b9b | 881 | goto cache_error; |
abc0446a | 882 | } |
4e3c1b9b MD |
883 | event->chan = chan; |
884 | event->filter = filter; | |
e5382b6d | 885 | event->id = chan->free_event_id++; |
3c997079 MD |
886 | event->instrumentation = itype; |
887 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 888 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
889 | INIT_LIST_HEAD(&event->enablers_ref_head); |
890 | ||
891 | switch (itype) { | |
ab2277d6 | 892 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
893 | /* Event will be enabled by enabler sync. */ |
894 | event->enabled = 0; | |
895 | event->registered = 0; | |
0bcedee9 | 896 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 897 | if (!event->desc) { |
4cf0bf51 | 898 | ret = -ENOENT; |
d3dbe23c | 899 | goto register_error; |
abc0446a | 900 | } |
3c997079 MD |
901 | /* Populate lttng_event structure before event registration. */ |
902 | smp_wmb(); | |
baf20995 | 903 | break; |
ab2277d6 | 904 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
905 | /* |
906 | * Needs to be explicitly enabled after creation, since | |
907 | * we may want to apply filters. | |
908 | */ | |
909 | event->enabled = 0; | |
3c997079 MD |
910 | event->registered = 1; |
911 | /* | |
912 | * Populate lttng_event structure before event | |
913 | * registration. | |
914 | */ | |
915 | smp_wmb(); | |
8bf17deb | 916 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
917 | event_param->u.kprobe.symbol_name, |
918 | event_param->u.kprobe.offset, | |
919 | event_param->u.kprobe.addr, | |
920 | event); | |
abc0446a | 921 | if (ret) { |
4cf0bf51 | 922 | ret = -EINVAL; |
d6d808f3 | 923 | goto register_error; |
abc0446a | 924 | } |
edeb3137 MD |
925 | ret = try_module_get(event->desc->owner); |
926 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 927 | break; |
7371f44c MD |
928 | case LTTNG_KERNEL_KRETPROBE: |
929 | { | |
a90917c3 | 930 | struct lttng_event *event_return; |
7371f44c MD |
931 | |
932 | /* kretprobe defines 2 events */ | |
a0493bef MD |
933 | /* |
934 | * Needs to be explicitly enabled after creation, since | |
935 | * we may want to apply filters. | |
936 | */ | |
937 | event->enabled = 0; | |
3c997079 | 938 | event->registered = 1; |
7371f44c MD |
939 | event_return = |
940 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 941 | if (!event_return) { |
4cf0bf51 | 942 | ret = -ENOMEM; |
7371f44c | 943 | goto register_error; |
abc0446a | 944 | } |
7371f44c MD |
945 | event_return->chan = chan; |
946 | event_return->filter = filter; | |
947 | event_return->id = chan->free_event_id++; | |
a0493bef | 948 | event_return->enabled = 0; |
3c997079 MD |
949 | event_return->registered = 1; |
950 | event_return->instrumentation = itype; | |
7371f44c | 951 | /* |
a90917c3 | 952 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
953 | */ |
954 | smp_wmb(); | |
3c997079 | 955 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
956 | event_param->u.kretprobe.symbol_name, |
957 | event_param->u.kretprobe.offset, | |
958 | event_param->u.kretprobe.addr, | |
959 | event, event_return); | |
960 | if (ret) { | |
961 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 962 | ret = -EINVAL; |
7371f44c MD |
963 | goto register_error; |
964 | } | |
965 | /* Take 2 refs on the module: one per event. */ | |
966 | ret = try_module_get(event->desc->owner); | |
967 | WARN_ON_ONCE(!ret); | |
968 | ret = try_module_get(event->desc->owner); | |
969 | WARN_ON_ONCE(!ret); | |
a90917c3 | 970 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 971 | event_return); |
abc0446a | 972 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
973 | if (ret) { |
974 | kmem_cache_free(event_cache, event_return); | |
975 | module_put(event->desc->owner); | |
976 | module_put(event->desc->owner); | |
977 | goto statedump_error; | |
978 | } | |
979 | list_add(&event_return->list, &chan->session->events); | |
980 | break; | |
981 | } | |
1ec65de1 | 982 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 983 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
984 | /* |
985 | * Needs to be explicitly enabled after creation, since | |
986 | * we may want to apply filters. | |
987 | */ | |
988 | event->enabled = 0; | |
3c997079 MD |
989 | event->registered = 0; |
990 | event->desc = event_desc; | |
badfe9f5 MD |
991 | switch (event_param->u.syscall.entryexit) { |
992 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
993 | ret = -EINVAL; | |
994 | goto register_error; | |
995 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
996 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
997 | break; | |
998 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
999 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1000 | break; | |
1001 | } | |
1002 | switch (event_param->u.syscall.abi) { | |
1003 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1004 | ret = -EINVAL; | |
1005 | goto register_error; | |
1006 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1007 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1008 | break; | |
1009 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1010 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1011 | break; | |
1012 | } | |
abc0446a | 1013 | if (!event->desc) { |
4cf0bf51 | 1014 | ret = -EINVAL; |
259b6cb3 | 1015 | goto register_error; |
abc0446a | 1016 | } |
1ec65de1 | 1017 | break; |
149b9a9d | 1018 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1019 | /* |
1020 | * Needs to be explicitly enabled after creation, since | |
1021 | * we may want to apply filters. | |
1022 | */ | |
1023 | event->enabled = 0; | |
1024 | event->registered = 1; | |
3aed4dca | 1025 | |
a344f64b FD |
1026 | /* |
1027 | * Populate lttng_event structure before event | |
1028 | * registration. | |
1029 | */ | |
1030 | smp_wmb(); | |
149b9a9d | 1031 | |
83b802dc | 1032 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1033 | event_param->u.uprobe.fd, |
149b9a9d YB |
1034 | event); |
1035 | if (ret) | |
1036 | goto register_error; | |
1037 | ret = try_module_get(event->desc->owner); | |
1038 | WARN_ON_ONCE(!ret); | |
1039 | break; | |
e884017c | 1040 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1041 | default: |
1042 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1043 | ret = -EINVAL; |
df07930b | 1044 | goto register_error; |
baf20995 | 1045 | } |
a90917c3 | 1046 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
1047 | WARN_ON_ONCE(ret > 0); |
1048 | if (ret) { | |
c099397a | 1049 | goto statedump_error; |
abc0446a | 1050 | } |
3c997079 | 1051 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1052 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1053 | return event; |
1054 | ||
c099397a | 1055 | statedump_error: |
259b6cb3 | 1056 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1057 | register_error: |
11b5a3c2 | 1058 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1059 | cache_error: |
1060 | exist: | |
3c997079 | 1061 | type_error: |
e5382b6d | 1062 | full: |
4cf0bf51 | 1063 | return ERR_PTR(ret); |
4e3c1b9b MD |
1064 | } |
1065 | ||
dffef45d FD |
1066 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1067 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1068 | uint64_t token, uint64_t error_counter_index, |
1069 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1070 | struct lttng_kernel_event_notifier *event_notifier_param, |
1071 | void *filter, enum lttng_kernel_instrumentation itype) | |
1072 | { | |
1073 | struct lttng_event_notifier *event_notifier; | |
1074 | const char *event_name; | |
1075 | struct hlist_head *head; | |
1076 | int ret; | |
1077 | ||
1078 | switch (itype) { | |
1079 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1080 | event_name = event_desc->name; |
1081 | break; | |
dffef45d | 1082 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1083 | case LTTNG_KERNEL_UPROBE: |
8a8ac9a8 | 1084 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1085 | event_name = event_notifier_param->event.name; |
1086 | break; | |
dffef45d FD |
1087 | case LTTNG_KERNEL_KRETPROBE: |
1088 | case LTTNG_KERNEL_FUNCTION: | |
1089 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1090 | default: |
1091 | WARN_ON_ONCE(1); | |
1092 | ret = -EINVAL; | |
1093 | goto type_error; | |
1094 | } | |
1095 | ||
1096 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1097 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1098 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1099 | WARN_ON_ONCE(!event_notifier->desc); | |
1100 | if (!strncmp(event_notifier->desc->name, event_name, | |
1101 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1102 | && event_notifier_group == event_notifier->group | |
1103 | && token == event_notifier->user_token) { | |
1104 | ret = -EEXIST; | |
1105 | goto exist; | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1110 | if (!event_notifier) { | |
1111 | ret = -ENOMEM; | |
1112 | goto cache_error; | |
1113 | } | |
21f58fb7 | 1114 | |
dffef45d FD |
1115 | event_notifier->group = event_notifier_group; |
1116 | event_notifier->user_token = token; | |
99f52fcc | 1117 | event_notifier->error_counter_index = error_counter_index; |
99d223ad | 1118 | event_notifier->num_captures = 0; |
dffef45d FD |
1119 | event_notifier->filter = filter; |
1120 | event_notifier->instrumentation = itype; | |
1121 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1122 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1123 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1124 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1125 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1126 | ||
1127 | switch (itype) { | |
1128 | case LTTNG_KERNEL_TRACEPOINT: | |
1129 | /* Event will be enabled by enabler sync. */ | |
1130 | event_notifier->enabled = 0; | |
1131 | event_notifier->registered = 0; | |
1132 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1133 | if (!event_notifier->desc) { | |
1134 | ret = -ENOENT; | |
1135 | goto register_error; | |
1136 | } | |
1137 | /* Populate lttng_event_notifier structure before event registration. */ | |
1138 | smp_wmb(); | |
1139 | break; | |
1140 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1141 | /* |
1142 | * Needs to be explicitly enabled after creation, since | |
1143 | * we may want to apply filters. | |
1144 | */ | |
1145 | event_notifier->enabled = 0; | |
1146 | event_notifier->registered = 1; | |
1147 | /* | |
1148 | * Populate lttng_event_notifier structure before event | |
1149 | * registration. | |
1150 | */ | |
1151 | smp_wmb(); | |
1152 | ret = lttng_kprobes_register_event_notifier( | |
1153 | event_notifier_param->event.u.kprobe.symbol_name, | |
1154 | event_notifier_param->event.u.kprobe.offset, | |
1155 | event_notifier_param->event.u.kprobe.addr, | |
1156 | event_notifier); | |
1157 | if (ret) { | |
1158 | ret = -EINVAL; | |
1159 | goto register_error; | |
1160 | } | |
1161 | ret = try_module_get(event_notifier->desc->owner); | |
1162 | WARN_ON_ONCE(!ret); | |
1163 | break; | |
8a8ac9a8 FD |
1164 | case LTTNG_KERNEL_NOOP: |
1165 | case LTTNG_KERNEL_SYSCALL: | |
1166 | /* | |
1167 | * Needs to be explicitly enabled after creation, since | |
1168 | * we may want to apply filters. | |
1169 | */ | |
1170 | event_notifier->enabled = 0; | |
1171 | event_notifier->registered = 0; | |
1172 | event_notifier->desc = event_desc; | |
1173 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1174 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1175 | ret = -EINVAL; | |
1176 | goto register_error; | |
1177 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1178 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1179 | break; | |
1180 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1181 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1182 | break; | |
1183 | } | |
1184 | switch (event_notifier_param->event.u.syscall.abi) { | |
1185 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1186 | ret = -EINVAL; | |
1187 | goto register_error; | |
1188 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1189 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1190 | break; | |
1191 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1192 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (!event_notifier->desc) { | |
1197 | ret = -EINVAL; | |
1198 | goto register_error; | |
1199 | } | |
1200 | break; | |
dffef45d | 1201 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1202 | /* |
1203 | * Needs to be explicitly enabled after creation, since | |
1204 | * we may want to apply filters. | |
1205 | */ | |
1206 | event_notifier->enabled = 0; | |
1207 | event_notifier->registered = 1; | |
1208 | ||
1209 | /* | |
1210 | * Populate lttng_event_notifier structure before | |
1211 | * event_notifier registration. | |
1212 | */ | |
1213 | smp_wmb(); | |
1214 | ||
1215 | ret = lttng_uprobes_register_event_notifier( | |
1216 | event_notifier_param->event.name, | |
1217 | event_notifier_param->event.u.uprobe.fd, | |
1218 | event_notifier); | |
1219 | if (ret) | |
1220 | goto register_error; | |
1221 | ret = try_module_get(event_notifier->desc->owner); | |
1222 | WARN_ON_ONCE(!ret); | |
1223 | break; | |
dffef45d FD |
1224 | case LTTNG_KERNEL_KRETPROBE: |
1225 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1226 | default: |
1227 | WARN_ON_ONCE(1); | |
1228 | ret = -EINVAL; | |
1229 | goto register_error; | |
1230 | } | |
1231 | ||
1232 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1233 | hlist_add_head(&event_notifier->hlist, head); | |
99f52fcc FD |
1234 | |
1235 | /* | |
1236 | * Clear the error counter bucket. The sessiond keeps track of which | |
1237 | * bucket is currently in use. We trust it. | |
1238 | */ | |
1239 | if (event_notifier_group->error_counter) { | |
1240 | size_t dimension_index[1]; | |
1241 | ||
1242 | /* | |
1243 | * Check that the index is within the boundary of the counter. | |
1244 | */ | |
1245 | if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) { | |
1246 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1247 | event_notifier_group->error_counter_len, event_notifier->error_counter_index); | |
1248 | ret = -EINVAL; | |
1249 | goto register_error; | |
1250 | } | |
1251 | ||
1252 | dimension_index[0] = event_notifier->error_counter_index; | |
1253 | ret = event_notifier_group->error_counter->ops->counter_clear( | |
1254 | event_notifier_group->error_counter->counter, | |
1255 | dimension_index); | |
1256 | if (ret) { | |
1257 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1258 | event_notifier->error_counter_index); | |
1259 | goto register_error; | |
1260 | } | |
1261 | } | |
1262 | ||
dffef45d FD |
1263 | return event_notifier; |
1264 | ||
1265 | register_error: | |
1266 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1267 | cache_error: | |
1268 | exist: | |
1269 | type_error: | |
1270 | return ERR_PTR(ret); | |
1271 | } | |
1272 | ||
99f52fcc FD |
1273 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1274 | const size_t *dim_indexes, int32_t cpu, | |
1275 | int64_t *val, bool *overflow, bool *underflow) | |
1276 | { | |
1277 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1278 | cpu, val, overflow, underflow); | |
1279 | } | |
1280 | ||
1281 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1282 | const size_t *dim_indexes, int64_t *val, | |
1283 | bool *overflow, bool *underflow) | |
1284 | { | |
1285 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1286 | val, overflow, underflow); | |
1287 | } | |
1288 | ||
1289 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1290 | const size_t *dim_indexes) | |
1291 | { | |
1292 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1293 | } | |
1294 | ||
3c997079 MD |
1295 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1296 | struct lttng_kernel_event *event_param, | |
1297 | void *filter, | |
1298 | const struct lttng_event_desc *event_desc, | |
1299 | enum lttng_kernel_instrumentation itype) | |
1300 | { | |
1301 | struct lttng_event *event; | |
1302 | ||
1303 | mutex_lock(&sessions_mutex); | |
1304 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1305 | itype); | |
1306 | mutex_unlock(&sessions_mutex); | |
1307 | return event; | |
1308 | } | |
1309 | ||
dffef45d FD |
1310 | struct lttng_event_notifier *lttng_event_notifier_create( |
1311 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1312 | uint64_t id, uint64_t error_counter_index, |
1313 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1314 | struct lttng_kernel_event_notifier *event_notifier_param, |
1315 | void *filter, enum lttng_kernel_instrumentation itype) | |
1316 | { | |
1317 | struct lttng_event_notifier *event_notifier; | |
1318 | ||
1319 | mutex_lock(&sessions_mutex); | |
1320 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc FD |
1321 | error_counter_index, event_notifier_group, |
1322 | event_notifier_param, filter, itype); | |
dffef45d FD |
1323 | mutex_unlock(&sessions_mutex); |
1324 | return event_notifier; | |
1325 | } | |
1326 | ||
3c997079 MD |
1327 | /* Only used for tracepoints for now. */ |
1328 | static | |
1329 | void register_event(struct lttng_event *event) | |
1330 | { | |
1331 | const struct lttng_event_desc *desc; | |
f127e61e | 1332 | int ret = -EINVAL; |
3c997079 | 1333 | |
3c997079 MD |
1334 | if (event->registered) |
1335 | return; | |
4ecb5ad5 | 1336 | |
3c997079 | 1337 | desc = event->desc; |
4ecb5ad5 MD |
1338 | switch (event->instrumentation) { |
1339 | case LTTNG_KERNEL_TRACEPOINT: | |
1340 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1341 | desc->probe_callback, | |
1342 | event); | |
1343 | break; | |
1344 | case LTTNG_KERNEL_SYSCALL: | |
2d6d88c6 | 1345 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1346 | break; |
1347 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1348 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1349 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1350 | case LTTNG_KERNEL_NOOP: |
1351 | ret = 0; | |
1352 | break; | |
e884017c | 1353 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1354 | default: |
1355 | WARN_ON_ONCE(1); | |
1356 | } | |
3c997079 MD |
1357 | if (!ret) |
1358 | event->registered = 1; | |
1359 | } | |
1360 | ||
4e3c1b9b MD |
1361 | /* |
1362 | * Only used internally at session destruction. | |
1363 | */ | |
a90917c3 | 1364 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1365 | { |
4ecb5ad5 | 1366 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1367 | int ret = -EINVAL; |
1368 | ||
3c997079 MD |
1369 | if (!event->registered) |
1370 | return 0; | |
1371 | ||
4ecb5ad5 | 1372 | desc = event->desc; |
38d024ae | 1373 | switch (event->instrumentation) { |
ab2277d6 | 1374 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1375 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1376 | event->desc->probe_callback, |
11b5a3c2 | 1377 | event); |
baf20995 | 1378 | break; |
ab2277d6 | 1379 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1380 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1381 | ret = 0; |
1382 | break; | |
7371f44c MD |
1383 | case LTTNG_KERNEL_KRETPROBE: |
1384 | lttng_kretprobes_unregister(event); | |
1385 | ret = 0; | |
1386 | break; | |
33a39a3c | 1387 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1388 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1389 | break; |
1390 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1391 | ret = 0; |
1392 | break; | |
149b9a9d | 1393 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1394 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1395 | ret = 0; |
1396 | break; | |
e884017c | 1397 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1398 | default: |
1399 | WARN_ON_ONCE(1); | |
1400 | } | |
3c997079 MD |
1401 | if (!ret) |
1402 | event->registered = 0; | |
dda6a249 MD |
1403 | return ret; |
1404 | } | |
1405 | ||
dffef45d FD |
1406 | /* Only used for tracepoints for now. */ |
1407 | static | |
b01155ba | 1408 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1409 | { |
1410 | const struct lttng_event_desc *desc; | |
1411 | int ret = -EINVAL; | |
1412 | ||
1413 | if (event_notifier->registered) | |
1414 | return; | |
1415 | ||
1416 | desc = event_notifier->desc; | |
1417 | switch (event_notifier->instrumentation) { | |
1418 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1419 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1420 | desc->event_notifier_callback, | |
1421 | event_notifier); | |
1422 | break; | |
8a8ac9a8 FD |
1423 | case LTTNG_KERNEL_SYSCALL: |
1424 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1425 | break; | |
dffef45d | 1426 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1427 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1428 | ret = 0; |
1429 | break; | |
dffef45d FD |
1430 | case LTTNG_KERNEL_KRETPROBE: |
1431 | case LTTNG_KERNEL_FUNCTION: | |
1432 | case LTTNG_KERNEL_NOOP: | |
1433 | default: | |
1434 | WARN_ON_ONCE(1); | |
1435 | } | |
1436 | if (!ret) | |
1437 | event_notifier->registered = 1; | |
1438 | } | |
1439 | ||
1440 | static | |
1441 | int _lttng_event_notifier_unregister( | |
1442 | struct lttng_event_notifier *event_notifier) | |
1443 | { | |
1444 | const struct lttng_event_desc *desc; | |
1445 | int ret = -EINVAL; | |
1446 | ||
1447 | if (!event_notifier->registered) | |
1448 | return 0; | |
1449 | ||
1450 | desc = event_notifier->desc; | |
1451 | switch (event_notifier->instrumentation) { | |
1452 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1453 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1454 | event_notifier->desc->event_notifier_callback, | |
1455 | event_notifier); | |
1456 | break; | |
dffef45d | 1457 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1458 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1459 | ret = 0; | |
1460 | break; | |
9de67196 FD |
1461 | case LTTNG_KERNEL_UPROBE: |
1462 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1463 | ret = 0; | |
1464 | break; | |
8a8ac9a8 FD |
1465 | case LTTNG_KERNEL_SYSCALL: |
1466 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1467 | break; | |
dffef45d FD |
1468 | case LTTNG_KERNEL_KRETPROBE: |
1469 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1470 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1471 | default: |
1472 | WARN_ON_ONCE(1); | |
1473 | } | |
1474 | if (!ret) | |
1475 | event_notifier->registered = 0; | |
1476 | return ret; | |
1477 | } | |
1478 | ||
dda6a249 MD |
1479 | /* |
1480 | * Only used internally at session destruction. | |
1481 | */ | |
be066e6c | 1482 | static |
a90917c3 | 1483 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1484 | { |
edeb3137 MD |
1485 | switch (event->instrumentation) { |
1486 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1487 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1488 | break; |
1489 | case LTTNG_KERNEL_KPROBE: | |
1490 | module_put(event->desc->owner); | |
8bf17deb | 1491 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1492 | break; |
7371f44c MD |
1493 | case LTTNG_KERNEL_KRETPROBE: |
1494 | module_put(event->desc->owner); | |
1495 | lttng_kretprobes_destroy_private(event); | |
1496 | break; | |
259b6cb3 | 1497 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1498 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1499 | break; |
149b9a9d YB |
1500 | case LTTNG_KERNEL_UPROBE: |
1501 | module_put(event->desc->owner); | |
83b802dc | 1502 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1503 | break; |
e884017c | 1504 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1505 | default: |
1506 | WARN_ON_ONCE(1); | |
1507 | } | |
dda6a249 | 1508 | list_del(&event->list); |
8070f5c0 | 1509 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1510 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1511 | } |
1512 | ||
dffef45d FD |
1513 | /* |
1514 | * Only used internally at session destruction. | |
1515 | */ | |
1516 | static | |
1517 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1518 | { | |
1519 | switch (event_notifier->instrumentation) { | |
1520 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1521 | lttng_event_desc_put(event_notifier->desc); |
1522 | break; | |
dffef45d | 1523 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1524 | module_put(event_notifier->desc->owner); |
1525 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1526 | break; | |
8a8ac9a8 FD |
1527 | case LTTNG_KERNEL_NOOP: |
1528 | case LTTNG_KERNEL_SYSCALL: | |
1529 | break; | |
9de67196 FD |
1530 | case LTTNG_KERNEL_UPROBE: |
1531 | module_put(event_notifier->desc->owner); | |
1532 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1533 | break; | |
dffef45d FD |
1534 | case LTTNG_KERNEL_KRETPROBE: |
1535 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1536 | default: |
1537 | WARN_ON_ONCE(1); | |
1538 | } | |
1539 | list_del(&event_notifier->list); | |
1540 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1541 | } | |
1542 | ||
d1f652f8 MD |
1543 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1544 | enum tracker_type tracker_type) | |
e0130fab | 1545 | { |
d1f652f8 MD |
1546 | switch (tracker_type) { |
1547 | case TRACKER_PID: | |
1548 | return &session->pid_tracker; | |
1549 | case TRACKER_VPID: | |
1550 | return &session->vpid_tracker; | |
1551 | case TRACKER_UID: | |
1552 | return &session->uid_tracker; | |
1553 | case TRACKER_VUID: | |
1554 | return &session->vuid_tracker; | |
1555 | case TRACKER_GID: | |
1556 | return &session->gid_tracker; | |
1557 | case TRACKER_VGID: | |
1558 | return &session->vgid_tracker; | |
1559 | default: | |
1560 | WARN_ON_ONCE(1); | |
1561 | return NULL; | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | int lttng_session_track_id(struct lttng_session *session, | |
1566 | enum tracker_type tracker_type, int id) | |
1567 | { | |
1568 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1569 | int ret; |
1570 | ||
d1f652f8 MD |
1571 | tracker = get_tracker(session, tracker_type); |
1572 | if (!tracker) | |
1573 | return -EINVAL; | |
1574 | if (id < -1) | |
e0130fab MD |
1575 | return -EINVAL; |
1576 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1577 | if (id == -1) { |
1578 | /* track all ids: destroy tracker. */ | |
1579 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1580 | ret = 0; |
1581 | } else { | |
d1f652f8 | 1582 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1583 | } |
e0130fab MD |
1584 | mutex_unlock(&sessions_mutex); |
1585 | return ret; | |
1586 | } | |
1587 | ||
d1f652f8 MD |
1588 | int lttng_session_untrack_id(struct lttng_session *session, |
1589 | enum tracker_type tracker_type, int id) | |
e0130fab | 1590 | { |
d1f652f8 | 1591 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1592 | int ret; |
1593 | ||
d1f652f8 MD |
1594 | tracker = get_tracker(session, tracker_type); |
1595 | if (!tracker) | |
1596 | return -EINVAL; | |
1597 | if (id < -1) | |
e0130fab MD |
1598 | return -EINVAL; |
1599 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1600 | if (id == -1) { |
1601 | /* untrack all ids: replace by empty tracker. */ | |
1602 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1603 | } else { |
d1f652f8 | 1604 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1605 | } |
e0130fab MD |
1606 | mutex_unlock(&sessions_mutex); |
1607 | return ret; | |
1608 | } | |
1609 | ||
7e6f9ef6 | 1610 | static |
d1f652f8 | 1611 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1612 | { |
d1f652f8 MD |
1613 | struct lttng_id_tracker *id_tracker = m->private; |
1614 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1615 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1616 | int iter = 0, i; |
1617 | ||
1618 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1619 | if (id_tracker_p) { |
1620 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1621 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1622 | |
f934e302 | 1623 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1624 | if (iter++ >= *pos) |
1625 | return e; | |
1626 | } | |
1627 | } | |
1628 | } else { | |
d1f652f8 | 1629 | /* ID tracker disabled. */ |
7e6f9ef6 | 1630 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1631 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1632 | } |
1633 | iter++; | |
1634 | } | |
1635 | /* End of list */ | |
1636 | return NULL; | |
1637 | } | |
1638 | ||
1639 | /* Called with sessions_mutex held. */ | |
1640 | static | |
d1f652f8 | 1641 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1642 | { |
d1f652f8 MD |
1643 | struct lttng_id_tracker *id_tracker = m->private; |
1644 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1645 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1646 | int iter = 0, i; |
1647 | ||
1648 | (*ppos)++; | |
d1f652f8 MD |
1649 | if (id_tracker_p) { |
1650 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1651 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1652 | |
f934e302 | 1653 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1654 | if (iter++ >= *ppos) |
1655 | return e; | |
1656 | } | |
1657 | } | |
1658 | } else { | |
d1f652f8 | 1659 | /* ID tracker disabled. */ |
7e6f9ef6 | 1660 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1661 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1662 | iter++; |
1663 | } | |
1664 | ||
1665 | /* End of list */ | |
1666 | return NULL; | |
1667 | } | |
1668 | ||
1669 | static | |
d1f652f8 | 1670 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1671 | { |
1672 | mutex_unlock(&sessions_mutex); | |
1673 | } | |
1674 | ||
1675 | static | |
d1f652f8 | 1676 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1677 | { |
d1f652f8 MD |
1678 | struct lttng_id_tracker *id_tracker = m->private; |
1679 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1680 | int id; | |
7e6f9ef6 | 1681 | |
d1f652f8 | 1682 | if (p == id_tracker_p) { |
7e6f9ef6 | 1683 | /* Tracker disabled. */ |
d1f652f8 | 1684 | id = -1; |
7e6f9ef6 | 1685 | } else { |
d1f652f8 | 1686 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1687 | |
d1f652f8 MD |
1688 | id = lttng_id_tracker_get_node_id(e); |
1689 | } | |
1690 | switch (id_tracker->tracker_type) { | |
1691 | case TRACKER_PID: | |
1692 | seq_printf(m, "process { pid = %d; };\n", id); | |
1693 | break; | |
1694 | case TRACKER_VPID: | |
1695 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1696 | break; | |
1697 | case TRACKER_UID: | |
1698 | seq_printf(m, "user { uid = %d; };\n", id); | |
1699 | break; | |
1700 | case TRACKER_VUID: | |
1701 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1702 | break; | |
1703 | case TRACKER_GID: | |
1704 | seq_printf(m, "group { gid = %d; };\n", id); | |
1705 | break; | |
1706 | case TRACKER_VGID: | |
1707 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1708 | break; | |
1709 | default: | |
1710 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1711 | } |
7e6f9ef6 MD |
1712 | return 0; |
1713 | } | |
1714 | ||
1715 | static | |
d1f652f8 MD |
1716 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1717 | .start = id_list_start, | |
1718 | .next = id_list_next, | |
1719 | .stop = id_list_stop, | |
1720 | .show = id_list_show, | |
7e6f9ef6 MD |
1721 | }; |
1722 | ||
1723 | static | |
d1f652f8 | 1724 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1725 | { |
d1f652f8 | 1726 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1727 | } |
1728 | ||
1729 | static | |
d1f652f8 | 1730 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1731 | { |
1732 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1733 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1734 | int ret; |
1735 | ||
d1f652f8 | 1736 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1737 | ret = seq_release(inode, file); |
d1f652f8 MD |
1738 | if (!ret) |
1739 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1740 | return ret; |
1741 | } | |
1742 | ||
d1f652f8 | 1743 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1744 | .owner = THIS_MODULE, |
d1f652f8 | 1745 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1746 | .read = seq_read, |
1747 | .llseek = seq_lseek, | |
d1f652f8 | 1748 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1749 | }; |
1750 | ||
d1f652f8 MD |
1751 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1752 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1753 | { |
d1f652f8 | 1754 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1755 | struct seq_file *m; |
1756 | int file_fd, ret; | |
1757 | ||
1758 | file_fd = lttng_get_unused_fd(); | |
1759 | if (file_fd < 0) { | |
1760 | ret = file_fd; | |
1761 | goto fd_error; | |
1762 | } | |
1763 | ||
d1f652f8 MD |
1764 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1765 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1766 | NULL, O_RDWR); |
d1f652f8 MD |
1767 | if (IS_ERR(tracker_ids_list_file)) { |
1768 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1769 | goto file_error; |
1770 | } | |
98d7281c MJ |
1771 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1772 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1773 | goto refcount_error; |
1774 | } | |
d1f652f8 | 1775 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1776 | if (ret < 0) |
1777 | goto open_error; | |
d1f652f8 MD |
1778 | m = tracker_ids_list_file->private_data; |
1779 | ||
1780 | m->private = get_tracker(session, tracker_type); | |
1781 | BUG_ON(!m->private); | |
1782 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1783 | |
1784 | return file_fd; | |
1785 | ||
1786 | open_error: | |
9c1f4643 MD |
1787 | atomic_long_dec(&session->file->f_count); |
1788 | refcount_error: | |
d1f652f8 | 1789 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1790 | file_error: |
1791 | put_unused_fd(file_fd); | |
1792 | fd_error: | |
1793 | return ret; | |
1794 | } | |
1795 | ||
3c997079 MD |
1796 | /* |
1797 | * Enabler management. | |
1798 | */ | |
1799 | static | |
4993071a PP |
1800 | int lttng_match_enabler_star_glob(const char *desc_name, |
1801 | const char *pattern) | |
3c997079 | 1802 | { |
cbc19040 MD |
1803 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1804 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1805 | return 0; |
1806 | return 1; | |
1807 | } | |
1808 | ||
1809 | static | |
4ecb5ad5 MD |
1810 | int lttng_match_enabler_name(const char *desc_name, |
1811 | const char *name) | |
3c997079 | 1812 | { |
4ecb5ad5 | 1813 | if (strcmp(desc_name, name)) |
3c997079 MD |
1814 | return 0; |
1815 | return 1; | |
1816 | } | |
1817 | ||
3c997079 MD |
1818 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1819 | struct lttng_enabler *enabler) | |
1820 | { | |
4ecb5ad5 | 1821 | const char *desc_name, *enabler_name; |
badfe9f5 | 1822 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1823 | |
1824 | enabler_name = enabler->event_param.name; | |
1825 | switch (enabler->event_param.instrumentation) { | |
1826 | case LTTNG_KERNEL_TRACEPOINT: | |
1827 | desc_name = desc->name; | |
3b861b22 FD |
1828 | switch (enabler->format_type) { |
1829 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1830 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1831 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1832 | return lttng_match_enabler_name(desc_name, enabler_name); |
1833 | default: | |
1834 | return -EINVAL; | |
1835 | } | |
4ecb5ad5 MD |
1836 | break; |
1837 | case LTTNG_KERNEL_SYSCALL: | |
1838 | desc_name = desc->name; | |
badfe9f5 | 1839 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1840 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1841 | compat = true; |
1842 | } | |
4ecb5ad5 MD |
1843 | if (!strncmp(desc_name, "syscall_exit_", |
1844 | strlen("syscall_exit_"))) { | |
1845 | desc_name += strlen("syscall_exit_"); | |
1846 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1847 | strlen("syscall_entry_"))) { | |
1848 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1849 | entry = true; |
4ecb5ad5 MD |
1850 | } else { |
1851 | WARN_ON_ONCE(1); | |
1852 | return -EINVAL; | |
1853 | } | |
badfe9f5 MD |
1854 | switch (enabler->event_param.u.syscall.entryexit) { |
1855 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1856 | break; | |
1857 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1858 | if (!entry) | |
1859 | return 0; | |
1860 | break; | |
1861 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1862 | if (entry) | |
1863 | return 0; | |
1864 | break; | |
1865 | default: | |
1866 | return -EINVAL; | |
1867 | } | |
1868 | switch (enabler->event_param.u.syscall.abi) { | |
1869 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1870 | break; | |
1871 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1872 | if (compat) | |
1873 | return 0; | |
1874 | break; | |
1875 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1876 | if (!compat) | |
1877 | return 0; | |
1878 | break; | |
1879 | default: | |
1880 | return -EINVAL; | |
1881 | } | |
1882 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1883 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1884 | switch (enabler->format_type) { |
1885 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1886 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1887 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1888 | return lttng_match_enabler_name(desc_name, enabler_name); |
1889 | default: | |
1890 | return -EINVAL; | |
1891 | } | |
1892 | break; | |
cff6938b | 1893 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1894 | return -EINVAL; /* Not implemented. */ |
1895 | default: | |
1896 | return -EINVAL; | |
1897 | } | |
4ecb5ad5 MD |
1898 | break; |
1899 | default: | |
1900 | WARN_ON_ONCE(1); | |
1901 | return -EINVAL; | |
1902 | } | |
3c997079 MD |
1903 | } |
1904 | ||
1905 | static | |
b2bc0bc8 FD |
1906 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1907 | struct lttng_event *event) | |
3c997079 | 1908 | { |
b2bc0bc8 FD |
1909 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1910 | event_enabler); | |
1911 | ||
1912 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1913 | return 0; |
b2bc0bc8 FD |
1914 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1915 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1916 | return 1; |
1917 | else | |
1918 | return 0; | |
1919 | } | |
1920 | ||
b01155ba FD |
1921 | static |
1922 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1923 | struct lttng_event_notifier *event_notifier) | |
1924 | { | |
1925 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1926 | event_notifier_enabler); | |
1927 | ||
1928 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1929 | return 0; | |
1930 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1931 | && event_notifier->group == event_notifier_enabler->group | |
1932 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1933 | return 1; | |
1934 | else | |
1935 | return 0; | |
1936 | } | |
1937 | ||
3c997079 | 1938 | static |
b2bc0bc8 FD |
1939 | struct lttng_enabler_ref *lttng_enabler_ref( |
1940 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1941 | struct lttng_enabler *enabler) |
1942 | { | |
1943 | struct lttng_enabler_ref *enabler_ref; | |
1944 | ||
b2bc0bc8 | 1945 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1946 | if (enabler_ref->ref == enabler) |
1947 | return enabler_ref; | |
1948 | } | |
1949 | return NULL; | |
1950 | } | |
1951 | ||
3c997079 | 1952 | static |
1b917d6b | 1953 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1954 | { |
b2bc0bc8 | 1955 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1956 | struct lttng_probe_desc *probe_desc; |
1957 | const struct lttng_event_desc *desc; | |
1958 | int i; | |
1959 | struct list_head *probe_list; | |
1960 | ||
1961 | probe_list = lttng_get_probe_list_head(); | |
1962 | /* | |
1963 | * For each probe event, if we find that a probe event matches | |
1964 | * our enabler, create an associated lttng_event if not | |
1965 | * already present. | |
1966 | */ | |
1967 | list_for_each_entry(probe_desc, probe_list, head) { | |
1968 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1969 | int found = 0; | |
1970 | struct hlist_head *head; | |
3c997079 MD |
1971 | struct lttng_event *event; |
1972 | ||
1973 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1974 | if (!lttng_desc_match_enabler(desc, |
1975 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1976 | continue; |
3c997079 MD |
1977 | |
1978 | /* | |
1979 | * Check if already created. | |
1980 | */ | |
4a11ef1c FD |
1981 | head = utils_borrow_hash_table_bucket( |
1982 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1983 | desc->name); | |
d216ecae | 1984 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1985 | if (event->desc == desc |
b2bc0bc8 | 1986 | && event->chan == event_enabler->chan) |
3c997079 MD |
1987 | found = 1; |
1988 | } | |
1989 | if (found) | |
1990 | continue; | |
1991 | ||
1992 | /* | |
1993 | * We need to create an event for this | |
1994 | * event probe. | |
1995 | */ | |
b2bc0bc8 | 1996 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1997 | NULL, NULL, desc, |
1998 | LTTNG_KERNEL_TRACEPOINT); | |
1999 | if (!event) { | |
5a15f70c | 2000 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
2001 | probe_desc->event_desc[i]->name); |
2002 | } | |
2003 | } | |
2004 | } | |
2005 | } | |
2006 | ||
b01155ba FD |
2007 | static |
2008 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2009 | { | |
2010 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2011 | struct lttng_probe_desc *probe_desc; | |
2012 | const struct lttng_event_desc *desc; | |
2013 | int i; | |
2014 | struct list_head *probe_list; | |
2015 | ||
2016 | probe_list = lttng_get_probe_list_head(); | |
2017 | /* | |
2018 | * For each probe event, if we find that a probe event matches | |
2019 | * our enabler, create an associated lttng_event_notifier if not | |
2020 | * already present. | |
2021 | */ | |
2022 | list_for_each_entry(probe_desc, probe_list, head) { | |
2023 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2024 | int found = 0; | |
2025 | struct hlist_head *head; | |
2026 | struct lttng_event_notifier *event_notifier; | |
2027 | ||
2028 | desc = probe_desc->event_desc[i]; | |
2029 | if (!lttng_desc_match_enabler(desc, | |
2030 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2031 | continue; | |
2032 | ||
2033 | /* | |
2034 | * Check if already created. | |
2035 | */ | |
2036 | head = utils_borrow_hash_table_bucket( | |
2037 | event_notifier_group->event_notifiers_ht.table, | |
2038 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
2039 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
2040 | if (event_notifier->desc == desc | |
2041 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2042 | found = 1; | |
2043 | } | |
2044 | if (found) | |
2045 | continue; | |
2046 | ||
2047 | /* | |
2048 | * We need to create a event_notifier for this event probe. | |
2049 | */ | |
2050 | event_notifier = _lttng_event_notifier_create(desc, | |
2051 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2052 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2053 | event_notifier_group, NULL, NULL, |
2054 | LTTNG_KERNEL_TRACEPOINT); | |
2055 | if (IS_ERR(event_notifier)) { | |
2056 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
2057 | probe_desc->event_desc[i]->name); | |
2058 | } | |
2059 | } | |
2060 | } | |
2061 | } | |
2062 | ||
33a39a3c | 2063 | static |
1b917d6b | 2064 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2065 | { |
2066 | int ret; | |
2067 | ||
3b82c4e1 | 2068 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2069 | WARN_ON_ONCE(ret); |
2070 | } | |
2071 | ||
8a8ac9a8 FD |
2072 | static |
2073 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2074 | { | |
2075 | int ret; | |
2076 | ||
2077 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2078 | WARN_ON_ONCE(ret); | |
2079 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2080 | WARN_ON_ONCE(ret); | |
2081 | } | |
2082 | ||
33a39a3c MD |
2083 | /* |
2084 | * Create struct lttng_event if it is missing and present in the list of | |
2085 | * tracepoint probes. | |
2086 | * Should be called with sessions mutex held. | |
2087 | */ | |
2088 | static | |
b2bc0bc8 | 2089 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2090 | { |
b2bc0bc8 | 2091 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2092 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2093 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
2094 | break; |
2095 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 2096 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
2097 | break; |
2098 | default: | |
2099 | WARN_ON_ONCE(1); | |
2100 | break; | |
2101 | } | |
2102 | } | |
2103 | ||
3c997079 | 2104 | /* |
b2bc0bc8 | 2105 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2106 | * and add backward reference from the event to the enabler. |
2107 | * Should be called with sessions mutex held. | |
2108 | */ | |
2109 | static | |
b2bc0bc8 | 2110 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2111 | { |
b2bc0bc8 FD |
2112 | struct lttng_channel *chan = event_enabler->chan; |
2113 | struct lttng_session *session = event_enabler->chan->session; | |
2114 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2115 | struct lttng_event *event; |
2116 | ||
b2bc0bc8 | 2117 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2118 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2119 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2120 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2121 | int enabled = base_enabler->enabled; |
2122 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2123 | ||
2124 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2125 | WRITE_ONCE(chan->syscall_all_entry, enabled); | |
2126 | ||
2127 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2128 | WRITE_ONCE(chan->syscall_all_exit, enabled); | |
badfe9f5 MD |
2129 | } |
2130 | ||
3c997079 | 2131 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2132 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2133 | |
b2bc0bc8 | 2134 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2135 | list_for_each_entry(event, &session->events, list) { |
2136 | struct lttng_enabler_ref *enabler_ref; | |
2137 | ||
b2bc0bc8 | 2138 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2139 | continue; |
b2bc0bc8 FD |
2140 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2141 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2142 | if (!enabler_ref) { |
2143 | /* | |
2144 | * If no backward ref, create it. | |
b2bc0bc8 | 2145 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2146 | */ |
2147 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2148 | if (!enabler_ref) | |
2149 | return -ENOMEM; | |
b2bc0bc8 | 2150 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2151 | list_add(&enabler_ref->node, |
2152 | &event->enablers_ref_head); | |
2153 | } | |
2154 | ||
f127e61e MD |
2155 | /* |
2156 | * Link filter bytecodes if not linked yet. | |
2157 | */ | |
2dfda770 FD |
2158 | lttng_enabler_link_bytecode(event->desc, |
2159 | lttng_static_ctx, | |
183e8b3a | 2160 | &event->filter_bytecode_runtime_head, |
60206944 | 2161 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2162 | |
3c997079 MD |
2163 | /* TODO: merge event context. */ |
2164 | } | |
2165 | return 0; | |
2166 | } | |
2167 | ||
b01155ba FD |
2168 | /* |
2169 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2170 | * tracepoint probes. | |
2171 | * Should be called with sessions mutex held. | |
2172 | */ | |
2173 | static | |
2174 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2175 | { | |
2176 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2177 | case LTTNG_KERNEL_TRACEPOINT: | |
2178 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2179 | break; | |
8a8ac9a8 FD |
2180 | case LTTNG_KERNEL_SYSCALL: |
2181 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2182 | break; | |
b01155ba FD |
2183 | default: |
2184 | WARN_ON_ONCE(1); | |
2185 | break; | |
2186 | } | |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2191 | */ | |
2192 | static | |
8a8ac9a8 FD |
2193 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2194 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2195 | { |
2196 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2197 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2198 | struct lttng_event_notifier *event_notifier; |
2199 | ||
8a8ac9a8 FD |
2200 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2201 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2202 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2203 | !strcmp(base_enabler->event_param.name, "*")) { | |
2204 | ||
2205 | int enabled = base_enabler->enabled; | |
2206 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2207 | ||
2208 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2209 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2210 | ||
2211 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2212 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2213 | ||
2214 | } | |
2215 | ||
b01155ba FD |
2216 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2217 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2218 | ||
2219 | /* Link the created event_notifier with its associated enabler. */ | |
2220 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2221 | struct lttng_enabler_ref *enabler_ref; | |
2222 | ||
2223 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2224 | continue; | |
2225 | ||
2226 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2227 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2228 | if (!enabler_ref) { | |
2229 | /* | |
2230 | * If no backward ref, create it. | |
2231 | * Add backward ref from event_notifier to enabler. | |
2232 | */ | |
2233 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2234 | if (!enabler_ref) | |
2235 | return -ENOMEM; | |
2236 | ||
2237 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2238 | event_notifier_enabler); | |
2239 | list_add(&enabler_ref->node, | |
2240 | &event_notifier->enablers_ref_head); | |
2241 | } | |
2242 | ||
2243 | /* | |
2244 | * Link filter bytecodes if not linked yet. | |
2245 | */ | |
2246 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2247 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2248 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2249 | |
2250 | /* Link capture bytecodes if not linked yet. */ | |
2251 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2252 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2253 | &event_notifier_enabler->capture_bytecode_head); | |
2254 | ||
2255 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2256 | } |
2257 | return 0; | |
2258 | } | |
2259 | ||
3c997079 MD |
2260 | /* |
2261 | * Called at module load: connect the probe on all enablers matching | |
2262 | * this event. | |
2263 | * Called with sessions lock held. | |
2264 | */ | |
2265 | int lttng_fix_pending_events(void) | |
2266 | { | |
2267 | struct lttng_session *session; | |
2268 | ||
2269 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2270 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2271 | return 0; |
2272 | } | |
2273 | ||
b01155ba FD |
2274 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2275 | struct lttng_event_notifier_group *event_notifier_group) | |
2276 | { | |
2277 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2278 | ||
2279 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2280 | node) { | |
2281 | if (event_notifier_enabler->base.enabled) | |
2282 | return true; | |
2283 | } | |
2284 | return false; | |
2285 | } | |
2286 | ||
2287 | bool lttng_event_notifier_active(void) | |
2288 | { | |
2289 | struct lttng_event_notifier_group *event_notifier_group; | |
2290 | ||
2291 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2292 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2293 | return true; | |
2294 | } | |
2295 | return false; | |
2296 | } | |
2297 | ||
2298 | int lttng_fix_pending_event_notifiers(void) | |
2299 | { | |
2300 | struct lttng_event_notifier_group *event_notifier_group; | |
2301 | ||
2302 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2303 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2304 | return 0; | |
2305 | } | |
2306 | ||
b2bc0bc8 FD |
2307 | struct lttng_event_enabler *lttng_event_enabler_create( |
2308 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2309 | struct lttng_kernel_event *event_param, |
2310 | struct lttng_channel *chan) | |
2311 | { | |
b2bc0bc8 | 2312 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2313 | |
b2bc0bc8 FD |
2314 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2315 | if (!event_enabler) | |
3c997079 | 2316 | return NULL; |
b2bc0bc8 FD |
2317 | event_enabler->base.format_type = format_type; |
2318 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2319 | memcpy(&event_enabler->base.event_param, event_param, | |
2320 | sizeof(event_enabler->base.event_param)); | |
2321 | event_enabler->chan = chan; | |
3c997079 | 2322 | /* ctx left NULL */ |
b2bc0bc8 FD |
2323 | event_enabler->base.enabled = 0; |
2324 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2325 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2326 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2327 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2328 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2329 | return event_enabler; |
3c997079 MD |
2330 | } |
2331 | ||
b2bc0bc8 | 2332 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2333 | { |
2334 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2335 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2336 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2337 | mutex_unlock(&sessions_mutex); |
2338 | return 0; | |
2339 | } | |
2340 | ||
b2bc0bc8 | 2341 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2342 | { |
2343 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2344 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2345 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2346 | mutex_unlock(&sessions_mutex); |
2347 | return 0; | |
2348 | } | |
2349 | ||
b2bc0bc8 | 2350 | static |
183e8b3a | 2351 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2352 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2353 | { | |
89ec2b91 | 2354 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2355 | uint32_t bytecode_len; |
2356 | int ret; | |
2357 | ||
2358 | ret = get_user(bytecode_len, &bytecode->len); | |
2359 | if (ret) | |
2360 | return ret; | |
52cfcdf3 | 2361 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2362 | GFP_KERNEL); |
2363 | if (!bytecode_node) | |
2364 | return -ENOMEM; | |
2365 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2366 | sizeof(*bytecode) + bytecode_len); | |
2367 | if (ret) | |
2368 | goto error_free; | |
b2bc0bc8 | 2369 | |
89ec2b91 | 2370 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2371 | bytecode_node->enabler = enabler; |
2372 | /* Enforce length based on allocated size */ | |
2373 | bytecode_node->bc.len = bytecode_len; | |
2374 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2375 | |
07dfc1d0 MD |
2376 | return 0; |
2377 | ||
2378 | error_free: | |
52cfcdf3 | 2379 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2380 | return ret; |
2381 | } | |
2382 | ||
183e8b3a | 2383 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2384 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2385 | { | |
2386 | int ret; | |
183e8b3a | 2387 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2388 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2389 | if (ret) | |
2390 | goto error; | |
2391 | ||
2392 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2393 | return 0; | |
2394 | ||
2395 | error: | |
2396 | return ret; | |
2397 | } | |
2398 | ||
3aed4dca FD |
2399 | int lttng_event_add_callsite(struct lttng_event *event, |
2400 | struct lttng_kernel_event_callsite __user *callsite) | |
2401 | { | |
2402 | ||
2403 | switch (event->instrumentation) { | |
2404 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2405 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2406 | default: |
2407 | return -EINVAL; | |
2408 | } | |
2409 | } | |
2410 | ||
b2bc0bc8 | 2411 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2412 | struct lttng_kernel_context *context_param) |
2413 | { | |
2414 | return -ENOSYS; | |
2415 | } | |
2416 | ||
2417 | static | |
2418 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2419 | { | |
89ec2b91 | 2420 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2421 | |
2422 | /* Destroy filter bytecode */ | |
2423 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2424 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2425 | lttng_kvfree(filter_node); |
07dfc1d0 | 2426 | } |
b2bc0bc8 FD |
2427 | } |
2428 | ||
2429 | static | |
2430 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2431 | { | |
2432 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2433 | |
3c997079 | 2434 | /* Destroy contexts */ |
b2bc0bc8 | 2435 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2436 | |
b2bc0bc8 FD |
2437 | list_del(&event_enabler->node); |
2438 | kfree(event_enabler); | |
3c997079 MD |
2439 | } |
2440 | ||
dffef45d FD |
2441 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2442 | struct lttng_event_notifier_group *event_notifier_group, | |
2443 | enum lttng_enabler_format_type format_type, | |
2444 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2445 | { | |
2446 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2447 | ||
2448 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2449 | if (!event_notifier_enabler) | |
2450 | return NULL; | |
2451 | ||
2452 | event_notifier_enabler->base.format_type = format_type; | |
2453 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2454 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2455 | ||
99f52fcc | 2456 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2457 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2458 | |
8a8ac9a8 FD |
2459 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2460 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2461 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2462 | ||
2463 | event_notifier_enabler->base.enabled = 0; | |
2464 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2465 | event_notifier_enabler->group = event_notifier_group; | |
2466 | ||
2467 | mutex_lock(&sessions_mutex); | |
2468 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2469 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2470 | |
2471 | mutex_unlock(&sessions_mutex); | |
2472 | ||
2473 | return event_notifier_enabler; | |
2474 | } | |
2475 | ||
2476 | int lttng_event_notifier_enabler_enable( | |
2477 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2478 | { | |
2479 | mutex_lock(&sessions_mutex); | |
2480 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2481 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2482 | mutex_unlock(&sessions_mutex); |
2483 | return 0; | |
2484 | } | |
2485 | ||
2486 | int lttng_event_notifier_enabler_disable( | |
2487 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2488 | { | |
2489 | mutex_lock(&sessions_mutex); | |
2490 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2491 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2492 | mutex_unlock(&sessions_mutex); |
2493 | return 0; | |
2494 | } | |
2495 | ||
183e8b3a | 2496 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2497 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2498 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2499 | { | |
2500 | int ret; | |
2501 | ||
183e8b3a | 2502 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2503 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2504 | bytecode); | |
2505 | if (ret) | |
2506 | goto error; | |
2507 | ||
b01155ba | 2508 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2509 | return 0; |
2510 | ||
2511 | error: | |
2512 | return ret; | |
2513 | } | |
2514 | ||
99d223ad FD |
2515 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2516 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2517 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2518 | { | |
2519 | struct lttng_bytecode_node *bytecode_node; | |
2520 | struct lttng_enabler *enabler = | |
2521 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2522 | uint32_t bytecode_len; | |
2523 | int ret; | |
2524 | ||
2525 | ret = get_user(bytecode_len, &bytecode->len); | |
2526 | if (ret) | |
2527 | return ret; | |
2528 | ||
2529 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2530 | GFP_KERNEL); | |
2531 | if (!bytecode_node) | |
2532 | return -ENOMEM; | |
2533 | ||
2534 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2535 | sizeof(*bytecode) + bytecode_len); | |
2536 | if (ret) | |
2537 | goto error_free; | |
2538 | ||
2539 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2540 | bytecode_node->enabler = enabler; | |
2541 | ||
2542 | /* Enforce length based on allocated size */ | |
2543 | bytecode_node->bc.len = bytecode_len; | |
2544 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2545 | ||
2546 | event_notifier_enabler->num_captures++; | |
2547 | ||
2548 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2549 | goto end; | |
2550 | ||
2551 | error_free: | |
2552 | lttng_kvfree(bytecode_node); | |
2553 | end: | |
2554 | return ret; | |
2555 | } | |
2556 | ||
9de67196 FD |
2557 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2558 | struct lttng_kernel_event_callsite __user *callsite) | |
2559 | { | |
2560 | ||
2561 | switch (event_notifier->instrumentation) { | |
2562 | case LTTNG_KERNEL_UPROBE: | |
2563 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2564 | callsite); | |
2565 | default: | |
2566 | return -EINVAL; | |
2567 | } | |
2568 | } | |
2569 | ||
dffef45d FD |
2570 | int lttng_event_notifier_enabler_attach_context( |
2571 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2572 | struct lttng_kernel_context *context_param) | |
2573 | { | |
2574 | return -ENOSYS; | |
2575 | } | |
2576 | ||
2577 | static | |
2578 | void lttng_event_notifier_enabler_destroy( | |
2579 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2580 | { | |
2581 | if (!event_notifier_enabler) { | |
2582 | return; | |
2583 | } | |
2584 | ||
2585 | list_del(&event_notifier_enabler->node); | |
2586 | ||
2587 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2588 | kfree(event_notifier_enabler); | |
2589 | } | |
2590 | ||
3c997079 | 2591 | /* |
b2bc0bc8 | 2592 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2593 | * session. |
2594 | * Should be called with sessions mutex held. | |
2595 | */ | |
2596 | static | |
b2bc0bc8 | 2597 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2598 | { |
b2bc0bc8 | 2599 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2600 | struct lttng_event *event; |
2601 | ||
b2bc0bc8 FD |
2602 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2603 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2604 | /* |
2605 | * For each event, if at least one of its enablers is enabled, | |
2606 | * and its channel and session transient states are enabled, we | |
2607 | * enable the event, else we disable it. | |
2608 | */ | |
2609 | list_for_each_entry(event, &session->events, list) { | |
2610 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2611 | struct lttng_bytecode_runtime *runtime; |
2612 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2613 | |
4ecb5ad5 MD |
2614 | switch (event->instrumentation) { |
2615 | case LTTNG_KERNEL_TRACEPOINT: | |
2616 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2617 | /* Enable events */ |
2618 | list_for_each_entry(enabler_ref, | |
2619 | &event->enablers_ref_head, node) { | |
2620 | if (enabler_ref->ref->enabled) { | |
2621 | enabled = 1; | |
2622 | break; | |
2623 | } | |
2624 | } | |
4ecb5ad5 MD |
2625 | break; |
2626 | default: | |
3c997079 MD |
2627 | /* Not handled with lazy sync. */ |
2628 | continue; | |
2629 | } | |
2630 | /* | |
2631 | * Enabled state is based on union of enablers, with | |
2632 | * intesection of session and channel transient enable | |
2633 | * states. | |
2634 | */ | |
2635 | enabled = enabled && session->tstate && event->chan->tstate; | |
2636 | ||
a8f2d0c7 | 2637 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2638 | /* |
2639 | * Sync tracepoint registration with event enabled | |
2640 | * state. | |
2641 | */ | |
2642 | if (enabled) { | |
2643 | register_event(event); | |
2644 | } else { | |
2645 | _lttng_event_unregister(event); | |
2646 | } | |
07dfc1d0 MD |
2647 | |
2648 | /* Check if has enablers without bytecode enabled */ | |
2649 | list_for_each_entry(enabler_ref, | |
2650 | &event->enablers_ref_head, node) { | |
2651 | if (enabler_ref->ref->enabled | |
2652 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2653 | has_enablers_without_bytecode = 1; | |
2654 | break; | |
2655 | } | |
2656 | } | |
2657 | event->has_enablers_without_bytecode = | |
2658 | has_enablers_without_bytecode; | |
2659 | ||
2660 | /* Enable filters */ | |
2661 | list_for_each_entry(runtime, | |
183e8b3a | 2662 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2663 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2664 | } |
2665 | } | |
2666 | ||
2667 | /* | |
2668 | * Apply enablers to session events, adding events to session if need | |
2669 | * be. It is required after each modification applied to an active | |
2670 | * session, and right before session "start". | |
2671 | * "lazy" sync means we only sync if required. | |
2672 | * Should be called with sessions mutex held. | |
2673 | */ | |
2674 | static | |
b2bc0bc8 | 2675 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2676 | { |
2677 | /* We can skip if session is not active */ | |
2678 | if (!session->active) | |
2679 | return; | |
b2bc0bc8 | 2680 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2681 | } |
2682 | ||
b01155ba FD |
2683 | static |
2684 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2685 | { | |
2686 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2687 | struct lttng_event_notifier *event_notifier; | |
2688 | ||
2689 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2690 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2691 | ||
2692 | /* | |
2693 | * For each event_notifier, if at least one of its enablers is enabled, | |
2694 | * we enable the event_notifier, else we disable it. | |
2695 | */ | |
2696 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2697 | struct lttng_enabler_ref *enabler_ref; | |
2698 | struct lttng_bytecode_runtime *runtime; | |
2699 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2700 | ||
2701 | switch (event_notifier->instrumentation) { | |
2702 | case LTTNG_KERNEL_TRACEPOINT: | |
2703 | case LTTNG_KERNEL_SYSCALL: | |
2704 | /* Enable event_notifiers */ | |
2705 | list_for_each_entry(enabler_ref, | |
2706 | &event_notifier->enablers_ref_head, node) { | |
2707 | if (enabler_ref->ref->enabled) { | |
2708 | enabled = 1; | |
2709 | break; | |
2710 | } | |
2711 | } | |
2712 | break; | |
2713 | default: | |
2714 | /* Not handled with sync. */ | |
2715 | continue; | |
2716 | } | |
2717 | ||
2718 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2719 | /* | |
2720 | * Sync tracepoint registration with event_notifier enabled | |
2721 | * state. | |
2722 | */ | |
2723 | if (enabled) { | |
2724 | if (!event_notifier->registered) | |
2725 | register_event_notifier(event_notifier); | |
2726 | } else { | |
2727 | if (event_notifier->registered) | |
2728 | _lttng_event_notifier_unregister(event_notifier); | |
2729 | } | |
2730 | ||
2731 | /* Check if has enablers without bytecode enabled */ | |
2732 | list_for_each_entry(enabler_ref, | |
2733 | &event_notifier->enablers_ref_head, node) { | |
2734 | if (enabler_ref->ref->enabled | |
2735 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2736 | has_enablers_without_bytecode = 1; | |
2737 | break; | |
2738 | } | |
2739 | } | |
2740 | event_notifier->has_enablers_without_bytecode = | |
2741 | has_enablers_without_bytecode; | |
2742 | ||
2743 | /* Enable filters */ | |
2744 | list_for_each_entry(runtime, | |
183e8b3a | 2745 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2746 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2747 | |
2748 | /* Enable captures */ | |
2749 | list_for_each_entry(runtime, | |
2750 | &event_notifier->capture_bytecode_runtime_head, node) | |
2751 | lttng_bytecode_capture_sync_state(runtime); | |
b01155ba FD |
2752 | } |
2753 | } | |
2754 | ||
1ec3f75a | 2755 | /* |
d83004aa JD |
2756 | * Serialize at most one packet worth of metadata into a metadata |
2757 | * channel. | |
92d9f5e6 MD |
2758 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2759 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2760 | * allows us to do racy operations such as looking for remaining space left in | |
2761 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2762 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2763 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2764 | * Returns the number of bytes written in the channel, 0 if no data |
2765 | * was written and a negative value on error. | |
1ec3f75a | 2766 | */ |
b3b8072b | 2767 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2768 | struct channel *chan, bool *coherent) |
d83004aa JD |
2769 | { |
2770 | struct lib_ring_buffer_ctx ctx; | |
2771 | int ret = 0; | |
2772 | size_t len, reserve_len; | |
2773 | ||
f613e3e6 | 2774 | /* |
92d9f5e6 MD |
2775 | * Ensure we support mutiple get_next / put sequences followed by |
2776 | * put_next. The metadata cache lock protects reading the metadata | |
2777 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2778 | * "flush" operations on the buffer invoked by different processes. | |
2779 | * Moreover, since the metadata cache memory can be reallocated, we | |
2780 | * need to have exclusive access against updates even though we only | |
2781 | * read it. | |
f613e3e6 | 2782 | */ |
92d9f5e6 | 2783 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2784 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2785 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2786 | goto end; |
f613e3e6 | 2787 | |
9616f0bf JD |
2788 | /* Metadata regenerated, change the version. */ |
2789 | if (stream->metadata_cache->version != stream->version) | |
2790 | stream->version = stream->metadata_cache->version; | |
2791 | ||
d83004aa | 2792 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2793 | stream->metadata_in; |
9de2c215 | 2794 | if (!len) |
de23d59d | 2795 | goto end; |
d83004aa | 2796 | reserve_len = min_t(size_t, |
b3b8072b | 2797 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2798 | len); |
b3b8072b | 2799 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2800 | sizeof(char), -1); |
2801 | /* | |
2802 | * If reservation failed, return an error to the caller. | |
2803 | */ | |
b3b8072b | 2804 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2805 | if (ret != 0) { |
2806 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2807 | stream->coherent = false; |
d83004aa JD |
2808 | goto end; |
2809 | } | |
b3b8072b | 2810 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2811 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2812 | reserve_len); |
b3b8072b | 2813 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2814 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2815 | if (reserve_len < len) |
8b97fd42 MD |
2816 | stream->coherent = false; |
2817 | else | |
2818 | stream->coherent = true; | |
d83004aa JD |
2819 | ret = reserve_len; |
2820 | ||
2821 | end: | |
8b97fd42 MD |
2822 | if (coherent) |
2823 | *coherent = stream->coherent; | |
92d9f5e6 | 2824 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2825 | return ret; |
2826 | } | |
2827 | ||
8b97fd42 MD |
2828 | static |
2829 | void lttng_metadata_begin(struct lttng_session *session) | |
2830 | { | |
3e75e2a7 MD |
2831 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2832 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2833 | } |
2834 | ||
2835 | static | |
2836 | void lttng_metadata_end(struct lttng_session *session) | |
2837 | { | |
3e75e2a7 MD |
2838 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2839 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2840 | struct lttng_metadata_stream *stream; | |
2841 | ||
3e75e2a7 MD |
2842 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2843 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2844 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2845 | } |
8b97fd42 MD |
2846 | } |
2847 | ||
d83004aa JD |
2848 | /* |
2849 | * Write the metadata to the metadata cache. | |
2850 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2851 | * The metadata cache lock protects us from concurrent read access from |
2852 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2853 | * The content of the printf is printed as a single atomic metadata |
2854 | * transaction. | |
d83004aa | 2855 | */ |
a90917c3 | 2856 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2857 | const char *fmt, ...) |
2858 | { | |
c099397a | 2859 | char *str; |
d83004aa | 2860 | size_t len; |
c099397a MD |
2861 | va_list ap; |
2862 | ||
585e5dcc | 2863 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2864 | |
2865 | va_start(ap, fmt); | |
2866 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2867 | va_end(ap); | |
2868 | if (!str) | |
2869 | return -ENOMEM; | |
2870 | ||
1ec3f75a | 2871 | len = strlen(str); |
3e75e2a7 | 2872 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2873 | if (session->metadata_cache->metadata_written + len > |
2874 | session->metadata_cache->cache_alloc) { | |
2875 | char *tmp_cache_realloc; | |
2876 | unsigned int tmp_cache_alloc_size; | |
2877 | ||
2878 | tmp_cache_alloc_size = max_t(unsigned int, | |
2879 | session->metadata_cache->cache_alloc + len, | |
2880 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2881 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2882 | if (!tmp_cache_realloc) |
2883 | goto err; | |
a606b6e8 ML |
2884 | if (session->metadata_cache->data) { |
2885 | memcpy(tmp_cache_realloc, | |
2886 | session->metadata_cache->data, | |
2887 | session->metadata_cache->cache_alloc); | |
2888 | vfree(session->metadata_cache->data); | |
2889 | } | |
2890 | ||
d83004aa JD |
2891 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2892 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2893 | } |
d83004aa JD |
2894 | memcpy(session->metadata_cache->data + |
2895 | session->metadata_cache->metadata_written, | |
2896 | str, len); | |
2897 | session->metadata_cache->metadata_written += len; | |
c099397a | 2898 | kfree(str); |
d83004aa | 2899 | |
d83004aa JD |
2900 | return 0; |
2901 | ||
2902 | err: | |
2903 | kfree(str); | |
2904 | return -ENOMEM; | |
c099397a MD |
2905 | } |
2906 | ||
f513b2bf MD |
2907 | static |
2908 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2909 | { | |
2910 | size_t i; | |
2911 | ||
2912 | for (i = 0; i < nesting; i++) { | |
2913 | int ret; | |
2914 | ||
2915 | ret = lttng_metadata_printf(session, " "); | |
2916 | if (ret) { | |
2917 | return ret; | |
2918 | } | |
2919 | } | |
2920 | return 0; | |
2921 | } | |
2922 | ||
ceabb767 MD |
2923 | static |
2924 | int lttng_field_name_statedump(struct lttng_session *session, | |
2925 | const struct lttng_event_field *field, | |
2926 | size_t nesting) | |
2927 | { | |
2928 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2929 | } | |
2930 | ||
2931 | static | |
2932 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2933 | const struct lttng_type *type, | |
2934 | size_t nesting) | |
2935 | { | |
2936 | int ret; | |
2937 | ||
2938 | WARN_ON_ONCE(type->atype != atype_integer); | |
2939 | ret = print_tabs(session, nesting); | |
2940 | if (ret) | |
2941 | return ret; | |
2942 | ret = lttng_metadata_printf(session, | |
2943 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2944 | type->u.integer.size, | |
2945 | type->u.integer.alignment, | |
2946 | type->u.integer.signedness, | |
2947 | (type->u.integer.encoding == lttng_encode_none) | |
2948 | ? "none" | |
2949 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2950 | ? "UTF8" | |
2951 | : "ASCII", | |
2952 | type->u.integer.base, | |
2953 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2954 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2955 | #else | |
2956 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2957 | #endif | |
2958 | ); | |
2959 | return ret; | |
2960 | } | |
2961 | ||
f513b2bf MD |
2962 | /* |
2963 | * Must be called with sessions_mutex held. | |
2964 | */ | |
2965 | static | |
2966 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2967 | const struct lttng_type *type, | |
2968 | size_t nesting) | |
2969 | { | |
2970 | int ret; | |
2971 | uint32_t i, nr_fields; | |
ceabb767 MD |
2972 | unsigned int alignment; |
2973 | ||
2974 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2975 | |
2976 | ret = print_tabs(session, nesting); | |
2977 | if (ret) | |
2978 | return ret; | |
2979 | ret = lttng_metadata_printf(session, | |
2980 | "struct {\n"); | |
2981 | if (ret) | |
2982 | return ret; | |
ceabb767 | 2983 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2984 | for (i = 0; i < nr_fields; i++) { |
2985 | const struct lttng_event_field *iter_field; | |
2986 | ||
ceabb767 | 2987 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2988 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2989 | if (ret) | |
2990 | return ret; | |
2991 | } | |
2992 | ret = print_tabs(session, nesting); | |
2993 | if (ret) | |
2994 | return ret; | |
ceabb767 MD |
2995 | alignment = type->u.struct_nestable.alignment; |
2996 | if (alignment) { | |
2997 | ret = lttng_metadata_printf(session, | |
2998 | "} align(%u)", | |
2999 | alignment); | |
3000 | } else { | |
3001 | ret = lttng_metadata_printf(session, | |
3002 | "}"); | |
3003 | } | |
f513b2bf MD |
3004 | return ret; |
3005 | } | |
3006 | ||
3007 | /* | |
3008 | * Must be called with sessions_mutex held. | |
3009 | */ | |
3010 | static | |
ceabb767 | 3011 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3012 | const struct lttng_event_field *field, |
3013 | size_t nesting) | |
3014 | { | |
3015 | int ret; | |
3016 | ||
3017 | ret = _lttng_struct_type_statedump(session, | |
3018 | &field->type, nesting); | |
3019 | if (ret) | |
3020 | return ret; | |
ceabb767 | 3021 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3022 | } |
3023 | ||
65c85aa6 MD |
3024 | /* |
3025 | * Must be called with sessions_mutex held. | |
3026 | */ | |
3027 | static | |
3028 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
3029 | const struct lttng_type *type, | |
3030 | size_t nesting) | |
3031 | { | |
3032 | int ret; | |
3033 | uint32_t i, nr_choices; | |
3034 | ||
ceabb767 MD |
3035 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
3036 | /* | |
3037 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3038 | */ | |
3039 | if (type->u.variant_nestable.alignment != 0) | |
3040 | return -EINVAL; | |
65c85aa6 MD |
3041 | ret = print_tabs(session, nesting); |
3042 | if (ret) | |
3043 | return ret; | |
3044 | ret = lttng_metadata_printf(session, | |
3045 | "variant <_%s> {\n", | |
ceabb767 | 3046 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
3047 | if (ret) |
3048 | return ret; | |
ceabb767 | 3049 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
3050 | for (i = 0; i < nr_choices; i++) { |
3051 | const struct lttng_event_field *iter_field; | |
3052 | ||
ceabb767 | 3053 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
3054 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3055 | if (ret) | |
3056 | return ret; | |
3057 | } | |
3058 | ret = print_tabs(session, nesting); | |
3059 | if (ret) | |
3060 | return ret; | |
3061 | ret = lttng_metadata_printf(session, | |
3062 | "}"); | |
3063 | return ret; | |
3064 | } | |
3065 | ||
3066 | /* | |
3067 | * Must be called with sessions_mutex held. | |
3068 | */ | |
3069 | static | |
ceabb767 | 3070 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3071 | const struct lttng_event_field *field, |
3072 | size_t nesting) | |
3073 | { | |
3074 | int ret; | |
3075 | ||
3076 | ret = _lttng_variant_type_statedump(session, | |
3077 | &field->type, nesting); | |
3078 | if (ret) | |
3079 | return ret; | |
ceabb767 | 3080 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3081 | } |
3082 | ||
f513b2bf MD |
3083 | /* |
3084 | * Must be called with sessions_mutex held. | |
3085 | */ | |
3086 | static | |
ceabb767 | 3087 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3088 | const struct lttng_event_field *field, |
3089 | size_t nesting) | |
3090 | { | |
3091 | int ret; | |
3092 | const struct lttng_type *elem_type; | |
3093 | ||
ceabb767 MD |
3094 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
3095 | ||
3096 | if (field->type.u.array_nestable.alignment) { | |
3097 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3098 | if (ret) |
3099 | return ret; | |
ceabb767 MD |
3100 | ret = lttng_metadata_printf(session, |
3101 | "struct { } align(%u) _%s_padding;\n", | |
3102 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3103 | field->name); | |
3104 | if (ret) | |
3105 | return ret; | |
3106 | } | |
3107 | /* | |
3108 | * Nested compound types: Only array of structures and variants are | |
3109 | * currently supported. | |
3110 | */ | |
3111 | elem_type = field->type.u.array_nestable.elem_type; | |
3112 | switch (elem_type->atype) { | |
3113 | case atype_integer: | |
3114 | case atype_struct_nestable: | |
3115 | case atype_variant_nestable: | |
3116 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3117 | if (ret) |
3118 | return ret; | |
3119 | break; | |
ceabb767 | 3120 | |
f513b2bf MD |
3121 | default: |
3122 | return -EINVAL; | |
3123 | } | |
3124 | ret = lttng_metadata_printf(session, | |
3125 | " _%s[%u];\n", | |
3126 | field->name, | |
ceabb767 | 3127 | field->type.u.array_nestable.length); |
f513b2bf MD |
3128 | return ret; |
3129 | } | |
3130 | ||
3131 | /* | |
3132 | * Must be called with sessions_mutex held. | |
3133 | */ | |
3134 | static | |
ceabb767 | 3135 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3136 | const struct lttng_event_field *field, |
3137 | size_t nesting) | |
3138 | { | |
3139 | int ret; | |
3140 | const char *length_name; | |
3141 | const struct lttng_type *elem_type; | |
3142 | ||
ceabb767 | 3143 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3144 | |
ceabb767 MD |
3145 | length_name = field->type.u.sequence_nestable.length_name; |
3146 | ||
3147 | if (field->type.u.sequence_nestable.alignment) { | |
3148 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3149 | if (ret) |
3150 | return ret; | |
ceabb767 MD |
3151 | ret = lttng_metadata_printf(session, |
3152 | "struct { } align(%u) _%s_padding;\n", | |
3153 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3154 | field->name); | |
3155 | if (ret) | |
3156 | return ret; | |
3157 | } | |
3158 | ||
3159 | /* | |
3160 | * Nested compound types: Only array of structures and variants are | |
3161 | * currently supported. | |
3162 | */ | |
3163 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3164 | switch (elem_type->atype) { | |
3165 | case atype_integer: | |
3166 | case atype_struct_nestable: | |
3167 | case atype_variant_nestable: | |
3168 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3169 | if (ret) |
3170 | return ret; | |
3171 | break; | |
ceabb767 | 3172 | |
f513b2bf MD |
3173 | default: |
3174 | return -EINVAL; | |
3175 | } | |
3176 | ret = lttng_metadata_printf(session, | |
3177 | " _%s[ _%s ];\n", | |
3178 | field->name, | |
ceabb767 | 3179 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3180 | return ret; |
3181 | } | |
3182 | ||
141ddf28 MD |
3183 | /* |
3184 | * Must be called with sessions_mutex held. | |
3185 | */ | |
3186 | static | |
ceabb767 MD |
3187 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3188 | const struct lttng_type *type, | |
141ddf28 MD |
3189 | size_t nesting) |
3190 | { | |
3191 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3192 | const struct lttng_type *container_type; |
141ddf28 MD |
3193 | int ret; |
3194 | unsigned int i, nr_entries; | |
3195 | ||
ceabb767 MD |
3196 | container_type = type->u.enum_nestable.container_type; |
3197 | if (container_type->atype != atype_integer) { | |
3198 | ret = -EINVAL; | |
3199 | goto end; | |
3200 | } | |
3201 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3202 | nr_entries = enum_desc->nr_entries; |
3203 | ||
3204 | ret = print_tabs(session, nesting); | |
3205 | if (ret) | |
3206 | goto end; | |
ceabb767 MD |
3207 | ret = lttng_metadata_printf(session, "enum : "); |
3208 | if (ret) | |
3209 | goto end; | |
3210 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3211 | if (ret) |
ceabb767 MD |
3212 | goto end; |
3213 | ret = lttng_metadata_printf(session, " {\n"); | |
3214 | if (ret) | |
3215 | goto end; | |
141ddf28 MD |
3216 | /* Dump all entries */ |
3217 | for (i = 0; i < nr_entries; i++) { | |
3218 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3219 | int j, len; | |
3220 | ||
3221 | ret = print_tabs(session, nesting + 1); | |
3222 | if (ret) | |
3223 | goto end; | |
3224 | ret = lttng_metadata_printf(session, | |
3225 | "\""); | |
3226 | if (ret) | |
3227 | goto end; | |
3228 | len = strlen(entry->string); | |
3229 | /* Escape the character '"' */ | |
3230 | for (j = 0; j < len; j++) { | |
3231 | char c = entry->string[j]; | |
3232 | ||
3233 | switch (c) { | |
3234 | case '"': | |
3235 | ret = lttng_metadata_printf(session, | |
3236 | "\\\""); | |
3237 | break; | |
3238 | case '\\': | |
3239 | ret = lttng_metadata_printf(session, | |
3240 | "\\\\"); | |
3241 | break; | |
3242 | default: | |
3243 | ret = lttng_metadata_printf(session, | |
3244 | "%c", c); | |
3245 | break; | |
3246 | } | |
3247 | if (ret) | |
3248 | goto end; | |
3249 | } | |
08ad1061 PP |
3250 | ret = lttng_metadata_printf(session, "\""); |
3251 | if (ret) | |
3252 | goto end; | |
3253 | ||
3254 | if (entry->options.is_auto) { | |
3255 | ret = lttng_metadata_printf(session, ",\n"); | |
3256 | if (ret) | |
3257 | goto end; | |
141ddf28 | 3258 | } else { |
7c559490 MD |
3259 | ret = lttng_metadata_printf(session, |
3260 | " = "); | |
3261 | if (ret) | |
3262 | goto end; | |
3263 | if (entry->start.signedness) | |
141ddf28 | 3264 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3265 | "%lld", (long long) entry->start.value); |
3266 | else | |
3267 | ret = lttng_metadata_printf(session, | |
3268 | "%llu", entry->start.value); | |
3269 | if (ret) | |
3270 | goto end; | |
3271 | if (entry->start.signedness == entry->end.signedness && | |
3272 | entry->start.value | |
3273 | == entry->end.value) { | |
141ddf28 | 3274 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3275 | ",\n"); |
3276 | } else { | |
3277 | if (entry->end.signedness) { | |
3278 | ret = lttng_metadata_printf(session, | |
3279 | " ... %lld,\n", | |
3280 | (long long) entry->end.value); | |
3281 | } else { | |
3282 | ret = lttng_metadata_printf(session, | |
3283 | " ... %llu,\n", | |
3284 | entry->end.value); | |
3285 | } | |
141ddf28 | 3286 | } |
7c559490 MD |
3287 | if (ret) |
3288 | goto end; | |
141ddf28 | 3289 | } |
141ddf28 MD |
3290 | } |
3291 | ret = print_tabs(session, nesting); | |
3292 | if (ret) | |
3293 | goto end; | |
ceabb767 | 3294 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3295 | end: |
3296 | return ret; | |
3297 | } | |
3298 | ||
d83004aa JD |
3299 | /* |
3300 | * Must be called with sessions_mutex held. | |
3301 | */ | |
c099397a | 3302 | static |
ceabb767 MD |
3303 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3304 | const struct lttng_event_field *field, | |
3305 | size_t nesting) | |
3306 | { | |
3307 | int ret; | |
3308 | ||
3309 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3310 | if (ret) | |
3311 | return ret; | |
3312 | return lttng_field_name_statedump(session, field, nesting); | |
3313 | } | |
3314 | ||
3315 | static | |
3316 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3317 | const struct lttng_event_field *field, | |
3318 | size_t nesting) | |
3319 | { | |
3320 | int ret; | |
3321 | ||
3322 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3323 | if (ret) | |
3324 | return ret; | |
3325 | return lttng_field_name_statedump(session, field, nesting); | |
3326 | } | |
3327 | ||
3328 | static | |
3329 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3330 | const struct lttng_type *type, | |
3331 | size_t nesting) | |
3332 | { | |
3333 | int ret; | |
3334 | ||
3335 | WARN_ON_ONCE(type->atype != atype_string); | |
3336 | /* Default encoding is UTF8 */ | |
3337 | ret = print_tabs(session, nesting); | |
3338 | if (ret) | |
3339 | return ret; | |
3340 | ret = lttng_metadata_printf(session, | |
3341 | "string%s", | |
3342 | type->u.string.encoding == lttng_encode_ASCII ? | |
3343 | " { encoding = ASCII; }" : ""); | |
3344 | return ret; | |
3345 | } | |
3346 | ||
3347 | static | |
3348 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3349 | const struct lttng_event_field *field, |
3350 | size_t nesting) | |
ceabb767 MD |
3351 | { |
3352 | int ret; | |
3353 | ||
3354 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3355 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3356 | if (ret) | |
3357 | return ret; | |
3358 | return lttng_field_name_statedump(session, field, nesting); | |
3359 | } | |
3360 | ||
3361 | /* | |
3362 | * Must be called with sessions_mutex held. | |
3363 | */ | |
3364 | static | |
3365 | int _lttng_type_statedump(struct lttng_session *session, | |
3366 | const struct lttng_type *type, | |
3367 | size_t nesting) | |
c099397a | 3368 | { |
c099397a | 3369 | int ret = 0; |
c099397a | 3370 | |
ceabb767 | 3371 | switch (type->atype) { |
8070f5c0 | 3372 | case atype_integer: |
ceabb767 | 3373 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3374 | break; |
ceabb767 MD |
3375 | case atype_enum_nestable: |
3376 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3377 | break; |
ceabb767 MD |
3378 | case atype_string: |
3379 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3380 | break; | |
3381 | case atype_struct_nestable: | |
3382 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3383 | break; |
ceabb767 MD |
3384 | case atype_variant_nestable: |
3385 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3386 | break; | |
3387 | ||
3388 | /* Nested arrays and sequences are not supported yet. */ | |
3389 | case atype_array_nestable: | |
3390 | case atype_sequence_nestable: | |
3391 | default: | |
3392 | WARN_ON_ONCE(1); | |
3393 | return -EINVAL; | |
8070f5c0 | 3394 | } |
ceabb767 MD |
3395 | return ret; |
3396 | } | |
8070f5c0 | 3397 | |
ceabb767 MD |
3398 | /* |
3399 | * Must be called with sessions_mutex held. | |
3400 | */ | |
3401 | static | |
3402 | int _lttng_field_statedump(struct lttng_session *session, | |
3403 | const struct lttng_event_field *field, | |
3404 | size_t nesting) | |
3405 | { | |
3406 | int ret = 0; | |
27d2368e | 3407 | |
ceabb767 MD |
3408 | switch (field->type.atype) { |
3409 | case atype_integer: | |
3410 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3411 | break; | |
3412 | case atype_enum_nestable: | |
3413 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3414 | break; |
8070f5c0 | 3415 | case atype_string: |
ceabb767 | 3416 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3417 | break; |
ceabb767 MD |
3418 | case atype_struct_nestable: |
3419 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3420 | break; |
ceabb767 MD |
3421 | case atype_array_nestable: |
3422 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3423 | break; |
ceabb767 MD |
3424 | case atype_sequence_nestable: |
3425 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3426 | break; |
ceabb767 MD |
3427 | case atype_variant_nestable: |
3428 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3429 | break; |
f513b2bf | 3430 | |
8070f5c0 MD |
3431 | default: |
3432 | WARN_ON_ONCE(1); | |
3433 | return -EINVAL; | |
3434 | } | |
3435 | return ret; | |
3436 | } | |
3437 | ||
3438 | static | |
a90917c3 | 3439 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3440 | struct lttng_ctx *ctx) |
3441 | { | |
3442 | int ret = 0; | |
3443 | int i; | |
3444 | ||
3445 | if (!ctx) | |
3446 | return 0; | |
3447 | for (i = 0; i < ctx->nr_fields; i++) { | |
3448 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3449 | ||
f513b2bf | 3450 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3451 | if (ret) |
3452 | return ret; | |
3453 | } | |
3454 | return ret; | |
3455 | } | |
3456 | ||
3457 | static | |
a90917c3 MD |
3458 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3459 | struct lttng_event *event) | |
8070f5c0 MD |
3460 | { |
3461 | const struct lttng_event_desc *desc = event->desc; | |
3462 | int ret = 0; | |
3463 | int i; | |
3464 | ||
3465 | for (i = 0; i < desc->nr_fields; i++) { | |
3466 | const struct lttng_event_field *field = &desc->fields[i]; | |
3467 | ||
f513b2bf | 3468 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3469 | if (ret) |
3470 | return ret; | |
c099397a MD |
3471 | } |
3472 | return ret; | |
3473 | } | |
3474 | ||
d83004aa JD |
3475 | /* |
3476 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3477 | * The entire event metadata is printed as a single atomic metadata |
3478 | * transaction. | |
d83004aa | 3479 | */ |
c099397a | 3480 | static |
a90917c3 MD |
3481 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3482 | struct lttng_channel *chan, | |
3483 | struct lttng_event *event) | |
c099397a MD |
3484 | { |
3485 | int ret = 0; | |
3486 | ||
585e5dcc | 3487 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3488 | return 0; |
d83004aa | 3489 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3490 | return 0; |
3491 | ||
8b97fd42 MD |
3492 | lttng_metadata_begin(session); |
3493 | ||
c099397a MD |
3494 | ret = lttng_metadata_printf(session, |
3495 | "event {\n" | |
ae734547 | 3496 | " name = \"%s\";\n" |
c099397a | 3497 | " id = %u;\n" |
b9074a1b | 3498 | " stream_id = %u;\n", |
c099397a MD |
3499 | event->desc->name, |
3500 | event->id, | |
3501 | event->chan->id); | |
3502 | if (ret) | |
3503 | goto end; | |
3504 | ||
b9074a1b MD |
3505 | if (event->ctx) { |
3506 | ret = lttng_metadata_printf(session, | |
3507 | " context := struct {\n"); | |
3508 | if (ret) | |
3509 | goto end; | |
3510 | } | |
a90917c3 | 3511 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3512 | if (ret) |
3513 | goto end; | |
b9074a1b MD |
3514 | if (event->ctx) { |
3515 | ret = lttng_metadata_printf(session, | |
3516 | " };\n"); | |
3517 | if (ret) | |
3518 | goto end; | |
3519 | } | |
8070f5c0 MD |
3520 | |
3521 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3522 | " fields := struct {\n" |
3523 | ); | |
3524 | if (ret) | |
3525 | goto end; | |
3526 | ||
a90917c3 | 3527 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3528 | if (ret) |
3529 | goto end; | |
3530 | ||
3531 | /* | |
3532 | * LTTng space reservation can only reserve multiples of the | |
3533 | * byte size. | |
3534 | */ | |
3535 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3536 | " };\n" |
3537 | "};\n\n"); | |
c099397a MD |
3538 | if (ret) |
3539 | goto end; | |
3540 | ||
c099397a MD |
3541 | event->metadata_dumped = 1; |
3542 | end: | |
8b97fd42 | 3543 | lttng_metadata_end(session); |
c099397a MD |
3544 | return ret; |
3545 | ||
3546 | } | |
3547 | ||
d83004aa JD |
3548 | /* |
3549 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3550 | * The entire channel metadata is printed as a single atomic metadata |
3551 | * transaction. | |
d83004aa | 3552 | */ |
c099397a | 3553 | static |
a90917c3 MD |
3554 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3555 | struct lttng_channel *chan) | |
c099397a MD |
3556 | { |
3557 | int ret = 0; | |
3558 | ||
585e5dcc | 3559 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3560 | return 0; |
d83004aa JD |
3561 | |
3562 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3563 | return 0; |
3564 | ||
8b97fd42 MD |
3565 | lttng_metadata_begin(session); |
3566 | ||
c099397a MD |
3567 | WARN_ON_ONCE(!chan->header_type); |
3568 | ret = lttng_metadata_printf(session, | |
3569 | "stream {\n" | |
3570 | " id = %u;\n" | |
9115fbdc | 3571 | " event.header := %s;\n" |
b9074a1b | 3572 | " packet.context := struct packet_context;\n", |
c099397a MD |
3573 | chan->id, |
3574 | chan->header_type == 1 ? "struct event_header_compact" : | |
3575 | "struct event_header_large"); | |
3576 | if (ret) | |
3577 | goto end; | |
3578 | ||
b9074a1b MD |
3579 | if (chan->ctx) { |
3580 | ret = lttng_metadata_printf(session, | |
3581 | " event.context := struct {\n"); | |
3582 | if (ret) | |
3583 | goto end; | |
3584 | } | |
a90917c3 | 3585 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3586 | if (ret) |
3587 | goto end; | |
b9074a1b MD |
3588 | if (chan->ctx) { |
3589 | ret = lttng_metadata_printf(session, | |
3590 | " };\n"); | |
3591 | if (ret) | |
3592 | goto end; | |
3593 | } | |
8070f5c0 MD |
3594 | |
3595 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3596 | "};\n\n"); |
8070f5c0 | 3597 | |
c099397a MD |
3598 | chan->metadata_dumped = 1; |
3599 | end: | |
8b97fd42 | 3600 | lttng_metadata_end(session); |
c099397a MD |
3601 | return ret; |
3602 | } | |
3603 | ||
d83004aa JD |
3604 | /* |
3605 | * Must be called with sessions_mutex held. | |
3606 | */ | |
9115fbdc | 3607 | static |
a90917c3 | 3608 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3609 | { |
3610 | return lttng_metadata_printf(session, | |
3611 | "struct packet_context {\n" | |
a3ccff4f MD |
3612 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3613 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3614 | " uint64_t content_size;\n" |
3615 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3616 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3617 | " unsigned long events_discarded;\n" |
9115fbdc | 3618 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3619 | "};\n\n" |
9115fbdc MD |
3620 | ); |
3621 | } | |
3622 | ||
3623 | /* | |
3624 | * Compact header: | |
3625 | * id: range: 0 - 30. | |
3626 | * id 31 is reserved to indicate an extended header. | |
3627 | * | |
3628 | * Large header: | |
3629 | * id: range: 0 - 65534. | |
3630 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3631 | * |
3632 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3633 | */ |
3634 | static | |
a90917c3 | 3635 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3636 | { |
3637 | return lttng_metadata_printf(session, | |
3638 | "struct event_header_compact {\n" | |
3639 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3640 | " variant <id> {\n" | |
3641 | " struct {\n" | |
a3ccff4f | 3642 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3643 | " } compact;\n" |
3644 | " struct {\n" | |
3645 | " uint32_t id;\n" | |
a3ccff4f | 3646 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3647 | " } extended;\n" |
3648 | " } v;\n" | |
3649 | "} align(%u);\n" | |
3650 | "\n" | |
3651 | "struct event_header_large {\n" | |
3652 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3653 | " variant <id> {\n" | |
3654 | " struct {\n" | |
a3ccff4f | 3655 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3656 | " } compact;\n" |
3657 | " struct {\n" | |
3658 | " uint32_t id;\n" | |
a3ccff4f | 3659 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3660 | " } extended;\n" |
3661 | " } v;\n" | |
3662 | "} align(%u);\n\n", | |
a90917c3 MD |
3663 | lttng_alignof(uint32_t) * CHAR_BIT, |
3664 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3665 | ); |
3666 | } | |
3667 | ||
a3ccff4f MD |
3668 | /* |
3669 | * Approximation of NTP time of day to clock monotonic correlation, | |
3670 | * taken at start of trace. | |
3671 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3672 | * in future versions. | |
5283350b MD |
3673 | * This function may return a negative offset. It may happen if the |
3674 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3675 | * |
3676 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3677 | * y2038 compliant. | |
a3ccff4f MD |
3678 | */ |
3679 | static | |
8967b2a3 | 3680 | int64_t measure_clock_offset(void) |
a3ccff4f | 3681 | { |
dcb93448 | 3682 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3683 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3684 | int64_t offset; |
a3ccff4f | 3685 | unsigned long flags; |
3636085f MJ |
3686 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3687 | struct timespec64 rts = { 0, 0 }; | |
3688 | #else | |
3689 | struct timespec rts = { 0, 0 }; | |
3690 | #endif | |
a3ccff4f MD |
3691 | |
3692 | /* Disable interrupts to increase correlation precision. */ | |
3693 | local_irq_save(flags); | |
3694 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3695 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3696 | ktime_get_real_ts64(&rts); | |
3697 | #else | |
216b6baa | 3698 | getnstimeofday(&rts); |
3636085f | 3699 | #endif |
a3ccff4f MD |
3700 | monotonic[1] = trace_clock_read64(); |
3701 | local_irq_restore(flags); | |
3702 | ||
dcb93448 | 3703 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3704 | realtime = (uint64_t) rts.tv_sec * tcf; |
3705 | if (tcf == NSEC_PER_SEC) { | |
3706 | realtime += rts.tv_nsec; | |
3707 | } else { | |
3708 | uint64_t n = rts.tv_nsec * tcf; | |
3709 | ||
3710 | do_div(n, NSEC_PER_SEC); | |
3711 | realtime += n; | |
3712 | } | |
dcb93448 | 3713 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3714 | return offset; |
3715 | } | |
3716 | ||
3eb95be4 JR |
3717 | static |
3718 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3719 | { | |
0f3eaad4 | 3720 | int ret = 0; |
3eb95be4 JR |
3721 | size_t i; |
3722 | char cur; | |
3723 | ||
3724 | i = 0; | |
3725 | cur = string[i]; | |
3726 | while (cur != '\0') { | |
3727 | switch (cur) { | |
3728 | case '\n': | |
3729 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3730 | break; | |
3731 | case '\\': | |
3732 | case '"': | |
3733 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3734 | if (ret) | |
3735 | goto error; | |
3736 | /* We still print the current char */ | |
3737 | /* Fallthrough */ | |
3738 | default: | |
3739 | ret = lttng_metadata_printf(session, "%c", cur); | |
3740 | break; | |
3741 | } | |
3742 | ||
3743 | if (ret) | |
3744 | goto error; | |
3745 | ||
3746 | cur = string[++i]; | |
3747 | } | |
3748 | error: | |
3749 | return ret; | |
3750 | } | |
3751 | ||
3752 | static | |
1c88f269 JR |
3753 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3754 | const char *field_value) | |
3eb95be4 JR |
3755 | { |
3756 | int ret; | |
3757 | ||
1c88f269 | 3758 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3759 | if (ret) |
3760 | goto error; | |
3761 | ||
1c88f269 | 3762 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3763 | if (ret) |
3764 | goto error; | |
3765 | ||
3766 | ret = lttng_metadata_printf(session, "\";\n"); | |
3767 | ||
3768 | error: | |
3769 | return ret; | |
3770 | } | |
3771 | ||
c099397a MD |
3772 | /* |
3773 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3774 | * Must be called with sessions_mutex held. |
c099397a MD |
3775 | */ |
3776 | static | |
a90917c3 | 3777 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3778 | { |
30bdb6e4 | 3779 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3780 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3781 | const char *product_uuid; |
a90917c3 MD |
3782 | struct lttng_channel *chan; |
3783 | struct lttng_event *event; | |
c099397a MD |
3784 | int ret = 0; |
3785 | ||
585e5dcc | 3786 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3787 | return 0; |
8b97fd42 MD |
3788 | |
3789 | lttng_metadata_begin(session); | |
3790 | ||
c099397a MD |
3791 | if (session->metadata_dumped) |
3792 | goto skip_session; | |
c099397a | 3793 | |
d793d5e1 | 3794 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3795 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3796 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3797 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3798 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3799 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3800 | |
3801 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3802 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3803 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3804 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3805 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3806 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3807 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3808 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3809 | "\n" |
3810 | "trace {\n" | |
3811 | " major = %u;\n" | |
3812 | " minor = %u;\n" | |
30bdb6e4 | 3813 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3814 | " byte_order = %s;\n" |
3815 | " packet.header := struct {\n" | |
3816 | " uint32_t magic;\n" | |
1ec3f75a | 3817 | " uint8_t uuid[16];\n" |
d793d5e1 | 3818 | " uint32_t stream_id;\n" |
5594698f | 3819 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3820 | " };\n" |
d793d5e1 | 3821 | "};\n\n", |
a90917c3 MD |
3822 | lttng_alignof(uint8_t) * CHAR_BIT, |
3823 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3824 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3825 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3826 | sizeof(unsigned long) * CHAR_BIT, |
3827 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3828 | CTF_SPEC_MAJOR, |
3829 | CTF_SPEC_MINOR, | |
d793d5e1 | 3830 | uuid_s, |
5214fa50 | 3831 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3832 | "be" |
3833 | #else | |
3834 | "le" | |
3835 | #endif | |
3836 | ); | |
3837 | if (ret) | |
3838 | goto end; | |
3839 | ||
99dc9597 MD |
3840 | ret = lttng_metadata_printf(session, |
3841 | "env {\n" | |
a6058143 | 3842 | " hostname = \"%s\";\n" |
c6c9e10f | 3843 | " domain = \"kernel\";\n" |
99dc9597 | 3844 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3845 | " kernel_release = \"%s\";\n" |
3846 | " kernel_version = \"%s\";\n" | |
3847 | " tracer_name = \"lttng-modules\";\n" | |
3848 | " tracer_major = %d;\n" | |
3849 | " tracer_minor = %d;\n" | |
3850 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3851 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3852 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3853 | utsname()->sysname, |
3854 | utsname()->release, | |
c6c9e10f MD |
3855 | utsname()->version, |
3856 | LTTNG_MODULES_MAJOR_VERSION, | |
3857 | LTTNG_MODULES_MINOR_VERSION, | |
3858 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3859 | ); |
3860 | if (ret) | |
3861 | goto end; | |
3862 | ||
1c88f269 JR |
3863 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3864 | if (ret) | |
3865 | goto end; | |
3866 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3867 | session->creation_time); | |
3eb95be4 JR |
3868 | if (ret) |
3869 | goto end; | |
3870 | ||
c88f762e GB |
3871 | /* Add the product UUID to the 'env' section */ |
3872 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3873 | if (product_uuid) { | |
3874 | ret = lttng_metadata_printf(session, | |
3875 | " product_uuid = \"%s\";\n", | |
3876 | product_uuid | |
3877 | ); | |
3878 | if (ret) | |
3879 | goto end; | |
3880 | } | |
3881 | ||
3882 | /* Close the 'env' section */ | |
3eb95be4 JR |
3883 | ret = lttng_metadata_printf(session, "};\n\n"); |
3884 | if (ret) | |
3885 | goto end; | |
3886 | ||
a3ccff4f MD |
3887 | ret = lttng_metadata_printf(session, |
3888 | "clock {\n" | |
2754583e MD |
3889 | " name = \"%s\";\n", |
3890 | trace_clock_name() | |
a82c63f1 MD |
3891 | ); |
3892 | if (ret) | |
3893 | goto end; | |
3894 | ||
3895 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3896 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3897 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3898 | clock_uuid_s |
3899 | ); | |
3900 | if (ret) | |
3901 | goto end; | |
3902 | } | |
3903 | ||
3904 | ret = lttng_metadata_printf(session, | |
2754583e | 3905 | " description = \"%s\";\n" |
a3ccff4f MD |
3906 | " freq = %llu; /* Frequency, in Hz */\n" |
3907 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3908 | " offset = %lld;\n" |
a3ccff4f | 3909 | "};\n\n", |
2754583e | 3910 | trace_clock_description(), |
a3ccff4f | 3911 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3912 | (long long) measure_clock_offset() |
a3ccff4f MD |
3913 | ); |
3914 | if (ret) | |
3915 | goto end; | |
3916 | ||
3917 | ret = lttng_metadata_printf(session, | |
3918 | "typealias integer {\n" | |
3919 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3920 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3921 | "} := uint27_clock_monotonic_t;\n" |
3922 | "\n" | |
3923 | "typealias integer {\n" | |
3924 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3925 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3926 | "} := uint32_clock_monotonic_t;\n" |
3927 | "\n" | |
3928 | "typealias integer {\n" | |
3929 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3930 | " map = clock.%s.value;\n" |
a3ccff4f | 3931 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3932 | trace_clock_name(), |
a3ccff4f | 3933 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3934 | trace_clock_name(), |
3935 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3936 | trace_clock_name() | |
a3ccff4f MD |
3937 | ); |
3938 | if (ret) | |
3939 | goto end; | |
3940 | ||
a90917c3 | 3941 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3942 | if (ret) |
3943 | goto end; | |
3944 | ||
a90917c3 | 3945 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3946 | if (ret) |
3947 | goto end; | |
3948 | ||
c099397a MD |
3949 | skip_session: |
3950 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3951 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3952 | if (ret) |
3953 | goto end; | |
3954 | } | |
3955 | ||
3956 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3957 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3958 | if (ret) |
3959 | goto end; | |
3960 | } | |
3961 | session->metadata_dumped = 1; | |
3962 | end: | |
8b97fd42 | 3963 | lttng_metadata_end(session); |
c099397a MD |
3964 | return ret; |
3965 | } | |
3966 | ||
c0e31d2e | 3967 | /** |
a90917c3 | 3968 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3969 | * @transport: transport structure |
3970 | * | |
3971 | * Registers a transport which can be used as output to extract the data out of | |
3972 | * LTTng. The module calling this registration function must ensure that no | |
3973 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3974 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3975 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3976 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3977 | * after its registration must it synchronize the TLBs. |
3978 | */ | |
a90917c3 | 3979 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3980 | { |
3981 | /* | |
3982 | * Make sure no page fault can be triggered by the module about to be | |
3983 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3984 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3985 | */ |
263b6c88 | 3986 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3987 | |
3988 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3989 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3990 | mutex_unlock(&sessions_mutex); |
3991 | } | |
a90917c3 | 3992 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3993 | |
3994 | /** | |
a90917c3 | 3995 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3996 | * @transport: transport structure |
3997 | */ | |
a90917c3 | 3998 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3999 | { |
4000 | mutex_lock(&sessions_mutex); | |
4001 | list_del(&transport->node); | |
4002 | mutex_unlock(&sessions_mutex); | |
4003 | } | |
a90917c3 | 4004 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4005 | |
a101fa10 MD |
4006 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4007 | { | |
4008 | /* | |
4009 | * Make sure no page fault can be triggered by the module about to be | |
4010 | * registered. We deal with this here so we don't have to call | |
4011 | * vmalloc_sync_mappings() in each module's init. | |
4012 | */ | |
4013 | wrapper_vmalloc_sync_mappings(); | |
4014 | ||
4015 | mutex_lock(&sessions_mutex); | |
4016 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4017 | mutex_unlock(&sessions_mutex); | |
4018 | } | |
4019 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4020 | ||
4021 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4022 | { | |
4023 | mutex_lock(&sessions_mutex); | |
4024 | list_del(&transport->node); | |
4025 | mutex_unlock(&sessions_mutex); | |
4026 | } | |
4027 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4028 | ||
894ce5dc | 4029 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4030 | |
4031 | enum cpuhp_state lttng_hp_prepare; | |
4032 | enum cpuhp_state lttng_hp_online; | |
4033 | ||
4034 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4035 | { | |
4036 | struct lttng_cpuhp_node *lttng_node; | |
4037 | ||
4038 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4039 | switch (lttng_node->component) { | |
4040 | case LTTNG_RING_BUFFER_FRONTEND: | |
4041 | return 0; | |
4042 | case LTTNG_RING_BUFFER_BACKEND: | |
4043 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4044 | case LTTNG_RING_BUFFER_ITER: | |
4045 | return 0; | |
4046 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4047 | return 0; | |
4048 | default: | |
4049 | return -EINVAL; | |
4050 | } | |
4051 | } | |
4052 | ||
4053 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4054 | { | |
4055 | struct lttng_cpuhp_node *lttng_node; | |
4056 | ||
4057 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4058 | switch (lttng_node->component) { | |
4059 | case LTTNG_RING_BUFFER_FRONTEND: | |
4060 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4061 | case LTTNG_RING_BUFFER_BACKEND: | |
4062 | return 0; | |
4063 | case LTTNG_RING_BUFFER_ITER: | |
4064 | return 0; | |
4065 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4066 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4067 | default: | |
4068 | return -EINVAL; | |
4069 | } | |
4070 | } | |
4071 | ||
4072 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4073 | { | |
4074 | struct lttng_cpuhp_node *lttng_node; | |
4075 | ||
4076 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4077 | switch (lttng_node->component) { | |
4078 | case LTTNG_RING_BUFFER_FRONTEND: | |
4079 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4080 | case LTTNG_RING_BUFFER_BACKEND: | |
4081 | return 0; | |
4082 | case LTTNG_RING_BUFFER_ITER: | |
4083 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4084 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4085 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4086 | default: | |
4087 | return -EINVAL; | |
4088 | } | |
4089 | } | |
4090 | ||
4091 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4092 | { | |
4093 | struct lttng_cpuhp_node *lttng_node; | |
4094 | ||
4095 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4096 | switch (lttng_node->component) { | |
4097 | case LTTNG_RING_BUFFER_FRONTEND: | |
4098 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4099 | case LTTNG_RING_BUFFER_BACKEND: | |
4100 | return 0; | |
4101 | case LTTNG_RING_BUFFER_ITER: | |
4102 | return 0; | |
4103 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4104 | return 0; | |
4105 | default: | |
4106 | return -EINVAL; | |
4107 | } | |
4108 | } | |
4109 | ||
4110 | static int __init lttng_init_cpu_hotplug(void) | |
4111 | { | |
4112 | int ret; | |
4113 | ||
4114 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4115 | lttng_hotplug_prepare, | |
4116 | lttng_hotplug_dead); | |
4117 | if (ret < 0) { | |
4118 | return ret; | |
4119 | } | |
4120 | lttng_hp_prepare = ret; | |
4121 | lttng_rb_set_hp_prepare(ret); | |
4122 | ||
4123 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4124 | lttng_hotplug_online, | |
4125 | lttng_hotplug_offline); | |
4126 | if (ret < 0) { | |
4127 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4128 | lttng_hp_prepare = 0; | |
4129 | return ret; | |
4130 | } | |
4131 | lttng_hp_online = ret; | |
4132 | lttng_rb_set_hp_online(ret); | |
4133 | ||
4134 | return 0; | |
4135 | } | |
4136 | ||
4137 | static void __exit lttng_exit_cpu_hotplug(void) | |
4138 | { | |
4139 | lttng_rb_set_hp_online(0); | |
4140 | cpuhp_remove_multi_state(lttng_hp_online); | |
4141 | lttng_rb_set_hp_prepare(0); | |
4142 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4143 | } | |
4144 | ||
1ee63d8d | 4145 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4146 | static int lttng_init_cpu_hotplug(void) |
4147 | { | |
4148 | return 0; | |
4149 | } | |
4150 | static void lttng_exit_cpu_hotplug(void) | |
4151 | { | |
4152 | } | |
1ee63d8d | 4153 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4154 | |
4155 | ||
a90917c3 | 4156 | static int __init lttng_events_init(void) |
4e3c1b9b | 4157 | { |
1c25284c MD |
4158 | int ret; |
4159 | ||
453b2495 JD |
4160 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4161 | if (ret) | |
4162 | return ret; | |
389d7070 | 4163 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4164 | if (ret) |
4165 | return ret; | |
4166 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4167 | if (ret) |
4168 | return ret; | |
4169 | ret = lttng_probes_init(); | |
389d7070 MD |
4170 | if (ret) |
4171 | return ret; | |
07dfc1d0 | 4172 | ret = lttng_context_init(); |
20591cf7 MD |
4173 | if (ret) |
4174 | return ret; | |
07dfc1d0 MD |
4175 | ret = lttng_tracepoint_init(); |
4176 | if (ret) | |
4177 | goto error_tp; | |
a90917c3 | 4178 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4179 | if (!event_cache) { |
4180 | ret = -ENOMEM; | |
dffef45d FD |
4181 | goto error_kmem_event; |
4182 | } | |
4183 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4184 | if (!event_notifier_cache) { | |
4185 | ret = -ENOMEM; | |
4186 | goto error_kmem_event_notifier; | |
20591cf7 | 4187 | } |
80996790 | 4188 | ret = lttng_abi_init(); |
02119ee5 MD |
4189 | if (ret) |
4190 | goto error_abi; | |
0c956676 MD |
4191 | ret = lttng_logger_init(); |
4192 | if (ret) | |
4193 | goto error_logger; | |
1e367326 MD |
4194 | ret = lttng_init_cpu_hotplug(); |
4195 | if (ret) | |
4196 | goto error_hotplug; | |
101215b7 | 4197 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4198 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4199 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4200 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4201 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4202 | LTTNG_VERSION_NAME, |
4203 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4204 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4205 | #else | |
4206 | "", | |
4207 | #endif | |
4208 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4209 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4210 | #else | |
4211 | ""); | |
4212 | #endif | |
4e3c1b9b | 4213 | return 0; |
0c956676 | 4214 | |
1e367326 MD |
4215 | error_hotplug: |
4216 | lttng_logger_exit(); | |
0c956676 MD |
4217 | error_logger: |
4218 | lttng_abi_exit(); | |
02119ee5 | 4219 | error_abi: |
dffef45d FD |
4220 | kmem_cache_destroy(event_notifier_cache); |
4221 | error_kmem_event_notifier: | |
1c25284c | 4222 | kmem_cache_destroy(event_cache); |
dffef45d | 4223 | error_kmem_event: |
20591cf7 | 4224 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4225 | error_tp: |
4226 | lttng_context_exit(); | |
101215b7 | 4227 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4228 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4229 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4230 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4231 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4232 | LTTNG_VERSION_NAME, |
4233 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4234 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4235 | #else | |
4236 | "", | |
4237 | #endif | |
4238 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4239 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4240 | #else | |
4241 | ""); | |
4242 | #endif | |
1c25284c | 4243 | return ret; |
4e3c1b9b MD |
4244 | } |
4245 | ||
a90917c3 | 4246 | module_init(lttng_events_init); |
11b5a3c2 | 4247 | |
a90917c3 | 4248 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4249 | { |
a90917c3 | 4250 | struct lttng_session *session, *tmpsession; |
92e94819 | 4251 | |
1e367326 | 4252 | lttng_exit_cpu_hotplug(); |
0c956676 | 4253 | lttng_logger_exit(); |
80996790 | 4254 | lttng_abi_exit(); |
92e94819 | 4255 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4256 | lttng_session_destroy(session); |
11b5a3c2 | 4257 | kmem_cache_destroy(event_cache); |
dffef45d | 4258 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4259 | lttng_tracepoint_exit(); |
07dfc1d0 | 4260 | lttng_context_exit(); |
101215b7 | 4261 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4262 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4263 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4264 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4265 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4266 | LTTNG_VERSION_NAME, |
4267 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4268 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4269 | #else | |
4270 | "", | |
4271 | #endif | |
4272 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4273 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4274 | #else | |
4275 | ""); | |
4276 | #endif | |
4e3c1b9b | 4277 | } |
92e94819 | 4278 | |
a90917c3 | 4279 | module_exit(lttng_events_exit); |
11b5a3c2 | 4280 | |
7ca11e77 | 4281 | #include <generated/patches.h> |
101215b7 MJ |
4282 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4283 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4284 | #endif | |
4285 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4286 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4287 | #endif | |
92e94819 MD |
4288 | MODULE_LICENSE("GPL and additional rights"); |
4289 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4290 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4291 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4292 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4293 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4294 | LTTNG_MODULES_EXTRAVERSION); |