Commit | Line | Data |
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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> | |
92bc1e23 | 39 | #include <lttng/events-internal.h> |
0b365677 | 40 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 41 | #include <lttng/tracer.h> |
21f58fb7 | 42 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
43 | #include <lttng/abi-old.h> |
44 | #include <lttng/endian.h> | |
45 | #include <lttng/string-utils.h> | |
4a11ef1c | 46 | #include <lttng/utils.h> |
24591303 MD |
47 | #include <ringbuffer/backend.h> |
48 | #include <ringbuffer/frontend.h> | |
3636085f | 49 | #include <wrapper/time.h> |
4e3c1b9b | 50 | |
d83004aa JD |
51 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
52 | ||
4e3c1b9b | 53 | static LIST_HEAD(sessions); |
750b05f2 | 54 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 55 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 56 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
57 | /* |
58 | * Protect the sessions and metadata caches. | |
59 | */ | |
4e3c1b9b MD |
60 | static DEFINE_MUTEX(sessions_mutex); |
61 | static struct kmem_cache *event_cache; | |
dffef45d | 62 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 63 | |
b2bc0bc8 FD |
64 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
65 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
66 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 67 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 68 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 69 | |
a90917c3 | 70 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 71 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
72 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
73 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 74 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 75 | static |
a90917c3 MD |
76 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
77 | struct lttng_channel *chan, | |
78 | struct lttng_event *event); | |
c099397a | 79 | static |
a90917c3 | 80 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 83 | static |
ceabb767 MD |
84 | int _lttng_type_statedump(struct lttng_session *session, |
85 | const struct lttng_type *type, | |
86 | size_t nesting); | |
87 | static | |
f513b2bf MD |
88 | int _lttng_field_statedump(struct lttng_session *session, |
89 | const struct lttng_event_field *field, | |
90 | size_t nesting); | |
c099397a | 91 | |
c099397a | 92 | void synchronize_trace(void) |
abcca994 | 93 | { |
5f4c791e | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
95 | synchronize_rcu(); |
96 | #else | |
abcca994 | 97 | synchronize_sched(); |
92da05ce MJ |
98 | #endif |
99 | ||
5f4c791e | 100 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
101 | #ifdef CONFIG_PREEMPT_RT_FULL |
102 | synchronize_rcu(); | |
103 | #endif | |
5f4c791e | 104 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
105 | #ifdef CONFIG_PREEMPT_RT |
106 | synchronize_rcu(); | |
107 | #endif | |
5f4c791e | 108 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
109 | } |
110 | ||
3c997079 MD |
111 | void lttng_lock_sessions(void) |
112 | { | |
113 | mutex_lock(&sessions_mutex); | |
114 | } | |
115 | ||
116 | void lttng_unlock_sessions(void) | |
117 | { | |
118 | mutex_unlock(&sessions_mutex); | |
119 | } | |
120 | ||
9fe593d2 FD |
121 | static struct lttng_transport *lttng_transport_find(const char *name) |
122 | { | |
123 | struct lttng_transport *transport; | |
124 | ||
125 | list_for_each_entry(transport, <tng_transport_list, node) { | |
126 | if (!strcmp(transport->name, name)) | |
127 | return transport; | |
128 | } | |
129 | return NULL; | |
130 | } | |
131 | ||
3c997079 MD |
132 | /* |
133 | * Called with sessions lock held. | |
134 | */ | |
135 | int lttng_session_active(void) | |
136 | { | |
137 | struct lttng_session *iter; | |
138 | ||
139 | list_for_each_entry(iter, &sessions, list) { | |
140 | if (iter->active) | |
141 | return 1; | |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
a90917c3 | 146 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 147 | { |
a90917c3 | 148 | struct lttng_session *session; |
d83004aa | 149 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 150 | int i; |
4e3c1b9b MD |
151 | |
152 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 153 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 154 | if (!session) |
d83004aa | 155 | goto err; |
4e3c1b9b | 156 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 157 | INIT_LIST_HEAD(&session->events); |
a7008254 | 158 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
159 | |
160 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
161 | GFP_KERNEL); | |
162 | if (!metadata_cache) | |
163 | goto err_free_session; | |
0ca42eb7 | 164 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
165 | if (!metadata_cache->data) |
166 | goto err_free_cache; | |
167 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
168 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 169 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
170 | session->metadata_cache = metadata_cache; |
171 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
172 | memcpy(&metadata_cache->uuid, &session->uuid, |
173 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
174 | INIT_LIST_HEAD(&session->enablers_head); |
175 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
176 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 177 | list_add(&session->list, &sessions); |
d1f652f8 MD |
178 | session->pid_tracker.session = session; |
179 | session->pid_tracker.tracker_type = TRACKER_PID; | |
180 | session->vpid_tracker.session = session; | |
181 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
182 | session->uid_tracker.session = session; | |
183 | session->uid_tracker.tracker_type = TRACKER_UID; | |
184 | session->vuid_tracker.session = session; | |
185 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
186 | session->gid_tracker.session = session; | |
187 | session->gid_tracker.tracker_type = TRACKER_GID; | |
188 | session->vgid_tracker.session = session; | |
189 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
190 | mutex_unlock(&sessions_mutex); |
191 | return session; | |
d83004aa JD |
192 | |
193 | err_free_cache: | |
194 | kfree(metadata_cache); | |
195 | err_free_session: | |
48f5e0b5 | 196 | lttng_kvfree(session); |
d83004aa JD |
197 | err: |
198 | mutex_unlock(&sessions_mutex); | |
199 | return NULL; | |
200 | } | |
201 | ||
99f52fcc FD |
202 | static |
203 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
204 | { | |
205 | struct lttng_counter_transport *transport; | |
206 | ||
207 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
208 | if (!strcmp(transport->name, name)) | |
209 | return transport; | |
210 | } | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | struct lttng_counter *lttng_kernel_counter_create( | |
215 | const char *counter_transport_name, | |
216 | size_t number_dimensions, const size_t *dimensions_sizes) | |
217 | { | |
218 | struct lttng_counter *counter = NULL; | |
219 | struct lttng_counter_transport *counter_transport = NULL; | |
220 | ||
221 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
222 | if (!counter_transport) { | |
223 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
224 | counter_transport_name); | |
225 | goto notransport; | |
226 | } | |
227 | if (!try_module_get(counter_transport->owner)) { | |
228 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
229 | goto notransport; | |
230 | } | |
231 | ||
232 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
233 | if (!counter) | |
234 | goto nomem; | |
235 | ||
236 | /* Create event notifier error counter. */ | |
237 | counter->ops = &counter_transport->ops; | |
238 | counter->transport = counter_transport; | |
239 | ||
240 | counter->counter = counter->ops->counter_create( | |
241 | number_dimensions, dimensions_sizes, 0); | |
242 | if (!counter->counter) { | |
243 | goto create_error; | |
244 | } | |
245 | ||
246 | return counter; | |
247 | ||
248 | create_error: | |
249 | lttng_kvfree(counter); | |
250 | nomem: | |
251 | if (counter_transport) | |
252 | module_put(counter_transport->owner); | |
253 | notransport: | |
254 | return NULL; | |
255 | } | |
256 | ||
750b05f2 FD |
257 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
258 | { | |
259 | struct lttng_transport *transport = NULL; | |
260 | struct lttng_event_notifier_group *event_notifier_group; | |
261 | const char *transport_name = "relay-event-notifier"; | |
262 | size_t subbuf_size = 4096; //TODO | |
263 | size_t num_subbuf = 16; //TODO | |
264 | unsigned int switch_timer_interval = 0; | |
265 | unsigned int read_timer_interval = 0; | |
dffef45d | 266 | int i; |
750b05f2 FD |
267 | |
268 | mutex_lock(&sessions_mutex); | |
269 | ||
270 | transport = lttng_transport_find(transport_name); | |
271 | if (!transport) { | |
272 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
273 | transport_name); | |
274 | goto notransport; | |
275 | } | |
276 | if (!try_module_get(transport->owner)) { | |
277 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
278 | transport_name); | |
279 | goto notransport; | |
280 | } | |
281 | ||
282 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
283 | GFP_KERNEL); | |
284 | if (!event_notifier_group) | |
285 | goto nomem; | |
286 | ||
287 | /* | |
288 | * Initialize the ring buffer used to store event notifier | |
289 | * notifications. | |
290 | */ | |
291 | event_notifier_group->ops = &transport->ops; | |
292 | event_notifier_group->chan = transport->ops.channel_create( | |
293 | transport_name, event_notifier_group, NULL, | |
294 | subbuf_size, num_subbuf, switch_timer_interval, | |
295 | read_timer_interval); | |
296 | if (!event_notifier_group->chan) | |
297 | goto create_error; | |
298 | ||
299 | event_notifier_group->transport = transport; | |
dffef45d FD |
300 | |
301 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
302 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
303 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
304 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
305 | ||
750b05f2 FD |
306 | list_add(&event_notifier_group->node, &event_notifier_groups); |
307 | ||
308 | mutex_unlock(&sessions_mutex); | |
309 | ||
310 | return event_notifier_group; | |
311 | ||
312 | create_error: | |
313 | lttng_kvfree(event_notifier_group); | |
314 | nomem: | |
315 | if (transport) | |
316 | module_put(transport->owner); | |
317 | notransport: | |
318 | mutex_unlock(&sessions_mutex); | |
319 | return NULL; | |
320 | } | |
321 | ||
d83004aa JD |
322 | void metadata_cache_destroy(struct kref *kref) |
323 | { | |
324 | struct lttng_metadata_cache *cache = | |
325 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 326 | vfree(cache->data); |
d83004aa | 327 | kfree(cache); |
4e3c1b9b MD |
328 | } |
329 | ||
a90917c3 | 330 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 331 | { |
a90917c3 MD |
332 | struct lttng_channel *chan, *tmpchan; |
333 | struct lttng_event *event, *tmpevent; | |
d83004aa | 334 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 335 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 336 | int ret; |
4e3c1b9b MD |
337 | |
338 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 339 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 340 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 341 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
342 | WARN_ON(ret); |
343 | } | |
dda6a249 | 344 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 345 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
346 | WARN_ON(ret); |
347 | } | |
abcca994 | 348 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 349 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 350 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
351 | WARN_ON(ret); |
352 | } | |
b2bc0bc8 | 353 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 354 | &session->enablers_head, node) |
b2bc0bc8 | 355 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 356 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 357 | _lttng_event_destroy(event); |
d83004aa JD |
358 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
359 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 360 | _lttng_channel_destroy(chan); |
d83004aa | 361 | } |
ab036a63 | 362 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
363 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
364 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 365 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
366 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
367 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
368 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
369 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
371 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 372 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
373 | list_del(&session->list); |
374 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 375 | lttng_kvfree(session); |
4e3c1b9b MD |
376 | } |
377 | ||
dffef45d FD |
378 | void lttng_event_notifier_group_destroy( |
379 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 380 | { |
dffef45d FD |
381 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
382 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
383 | int ret; | |
384 | ||
750b05f2 FD |
385 | if (!event_notifier_group) |
386 | return; | |
387 | ||
388 | mutex_lock(&sessions_mutex); | |
dffef45d | 389 | |
3b82c4e1 | 390 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
391 | WARN_ON(ret); |
392 | ||
dffef45d FD |
393 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
394 | &event_notifier_group->event_notifiers_head, list) { | |
395 | ret = _lttng_event_notifier_unregister(event_notifier); | |
396 | WARN_ON(ret); | |
397 | } | |
398 | ||
b01155ba FD |
399 | /* Wait for in-flight event notifier to complete */ |
400 | synchronize_trace(); | |
401 | ||
21f58fb7 FD |
402 | irq_work_sync(&event_notifier_group->wakeup_pending); |
403 | ||
8a8ac9a8 FD |
404 | kfree(event_notifier_group->sc_filter); |
405 | ||
dffef45d FD |
406 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
407 | &event_notifier_group->enablers_head, node) | |
408 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
409 | ||
410 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
411 | &event_notifier_group->event_notifiers_head, list) | |
412 | _lttng_event_notifier_destroy(event_notifier); | |
413 | ||
99f52fcc FD |
414 | if (event_notifier_group->error_counter) { |
415 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 416 | |
99f52fcc FD |
417 | error_counter->ops->counter_destroy(error_counter->counter); |
418 | module_put(error_counter->transport->owner); | |
419 | lttng_kvfree(error_counter); | |
420 | event_notifier_group->error_counter = NULL; | |
421 | } | |
422 | ||
750b05f2 FD |
423 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
424 | module_put(event_notifier_group->transport->owner); | |
425 | list_del(&event_notifier_group->node); | |
dffef45d | 426 | |
750b05f2 FD |
427 | mutex_unlock(&sessions_mutex); |
428 | lttng_kvfree(event_notifier_group); | |
429 | } | |
430 | ||
601252cf MD |
431 | int lttng_session_statedump(struct lttng_session *session) |
432 | { | |
433 | int ret; | |
434 | ||
435 | mutex_lock(&sessions_mutex); | |
436 | ret = lttng_statedump_start(session); | |
437 | mutex_unlock(&sessions_mutex); | |
438 | return ret; | |
439 | } | |
440 | ||
a90917c3 | 441 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
442 | { |
443 | int ret = 0; | |
a90917c3 | 444 | struct lttng_channel *chan; |
c0e31d2e MD |
445 | |
446 | mutex_lock(&sessions_mutex); | |
447 | if (session->active) { | |
448 | ret = -EBUSY; | |
449 | goto end; | |
450 | } | |
c099397a | 451 | |
3c997079 MD |
452 | /* Set transient enabler state to "enabled" */ |
453 | session->tstate = 1; | |
454 | ||
4ef81e4a | 455 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 456 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 457 | |
c099397a MD |
458 | /* |
459 | * Snapshot the number of events per channel to know the type of header | |
460 | * we need to use. | |
461 | */ | |
462 | list_for_each_entry(chan, &session->chan, list) { | |
463 | if (chan->header_type) | |
464 | continue; /* don't change it if session stop/restart */ | |
465 | if (chan->free_event_id < 31) | |
466 | chan->header_type = 1; /* compact */ | |
467 | else | |
468 | chan->header_type = 2; /* large */ | |
469 | } | |
470 | ||
64af2437 | 471 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
472 | list_for_each_entry(chan, &session->chan, list) { |
473 | if (chan->channel_type != METADATA_CHANNEL) | |
474 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
475 | } | |
64af2437 | 476 | |
a8f2d0c7 MJ |
477 | WRITE_ONCE(session->active, 1); |
478 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 479 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 480 | if (ret) { |
a8f2d0c7 | 481 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
482 | goto end; |
483 | } | |
484 | ret = lttng_statedump_start(session); | |
360f38ea | 485 | if (ret) |
a8f2d0c7 | 486 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
487 | end: |
488 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 489 | return ret; |
c0e31d2e MD |
490 | } |
491 | ||
a90917c3 | 492 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
493 | { |
494 | int ret = 0; | |
64af2437 | 495 | struct lttng_channel *chan; |
c0e31d2e MD |
496 | |
497 | mutex_lock(&sessions_mutex); | |
498 | if (!session->active) { | |
499 | ret = -EBUSY; | |
500 | goto end; | |
501 | } | |
a8f2d0c7 | 502 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
503 | |
504 | /* Set transient enabler state to "disabled" */ | |
505 | session->tstate = 0; | |
b2bc0bc8 | 506 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
507 | |
508 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
509 | list_for_each_entry(chan, &session->chan, list) { |
510 | if (chan->channel_type != METADATA_CHANNEL) | |
511 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
512 | } | |
c0e31d2e MD |
513 | end: |
514 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 515 | return ret; |
c0e31d2e MD |
516 | } |
517 | ||
9616f0bf JD |
518 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
519 | { | |
520 | int ret = 0; | |
521 | struct lttng_channel *chan; | |
522 | struct lttng_event *event; | |
523 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
524 | struct lttng_metadata_stream *stream; | |
525 | ||
526 | mutex_lock(&sessions_mutex); | |
527 | if (!session->active) { | |
528 | ret = -EBUSY; | |
529 | goto end; | |
530 | } | |
531 | ||
532 | mutex_lock(&cache->lock); | |
533 | memset(cache->data, 0, cache->cache_alloc); | |
534 | cache->metadata_written = 0; | |
535 | cache->version++; | |
536 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
537 | stream->metadata_out = 0; | |
538 | stream->metadata_in = 0; | |
539 | } | |
540 | mutex_unlock(&cache->lock); | |
541 | ||
542 | session->metadata_dumped = 0; | |
543 | list_for_each_entry(chan, &session->chan, list) { | |
544 | chan->metadata_dumped = 0; | |
545 | } | |
546 | ||
547 | list_for_each_entry(event, &session->events, list) { | |
548 | event->metadata_dumped = 0; | |
549 | } | |
550 | ||
551 | ret = _lttng_session_metadata_statedump(session); | |
552 | ||
553 | end: | |
554 | mutex_unlock(&sessions_mutex); | |
555 | return ret; | |
556 | } | |
557 | ||
a90917c3 | 558 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 559 | { |
3c997079 | 560 | int ret = 0; |
e64957da | 561 | |
3c997079 MD |
562 | mutex_lock(&sessions_mutex); |
563 | if (channel->channel_type == METADATA_CHANNEL) { | |
564 | ret = -EPERM; | |
565 | goto end; | |
566 | } | |
567 | if (channel->enabled) { | |
568 | ret = -EEXIST; | |
569 | goto end; | |
570 | } | |
571 | /* Set transient enabler state to "enabled" */ | |
572 | channel->tstate = 1; | |
b2bc0bc8 | 573 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 574 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 575 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
576 | end: |
577 | mutex_unlock(&sessions_mutex); | |
578 | return ret; | |
e64957da MD |
579 | } |
580 | ||
a90917c3 | 581 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 582 | { |
3c997079 | 583 | int ret = 0; |
e64957da | 584 | |
3c997079 MD |
585 | mutex_lock(&sessions_mutex); |
586 | if (channel->channel_type == METADATA_CHANNEL) { | |
587 | ret = -EPERM; | |
588 | goto end; | |
589 | } | |
590 | if (!channel->enabled) { | |
591 | ret = -EEXIST; | |
592 | goto end; | |
593 | } | |
594 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 595 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
596 | /* Set transient enabler state to "enabled" */ |
597 | channel->tstate = 0; | |
b2bc0bc8 | 598 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
599 | end: |
600 | mutex_unlock(&sessions_mutex); | |
601 | return ret; | |
e64957da MD |
602 | } |
603 | ||
a90917c3 | 604 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 605 | { |
3c997079 | 606 | int ret = 0; |
e64957da | 607 | |
3c997079 MD |
608 | mutex_lock(&sessions_mutex); |
609 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
610 | ret = -EPERM; | |
611 | goto end; | |
612 | } | |
613 | if (event->enabled) { | |
614 | ret = -EEXIST; | |
615 | goto end; | |
616 | } | |
a0493bef | 617 | switch (event->instrumentation) { |
b4a75708 | 618 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
619 | case LTTNG_KERNEL_SYSCALL: |
620 | ret = -EINVAL; | |
621 | break; | |
b4a75708 MD |
622 | |
623 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 624 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 625 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 626 | break; |
b4a75708 | 627 | |
a0493bef MD |
628 | case LTTNG_KERNEL_KRETPROBE: |
629 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
630 | break; | |
b4a75708 MD |
631 | |
632 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
633 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
634 | default: |
635 | WARN_ON_ONCE(1); | |
636 | ret = -EINVAL; | |
637 | } | |
3c997079 MD |
638 | end: |
639 | mutex_unlock(&sessions_mutex); | |
640 | return ret; | |
e64957da MD |
641 | } |
642 | ||
a90917c3 | 643 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 644 | { |
3c997079 | 645 | int ret = 0; |
e64957da | 646 | |
3c997079 MD |
647 | mutex_lock(&sessions_mutex); |
648 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
649 | ret = -EPERM; | |
650 | goto end; | |
651 | } | |
652 | if (!event->enabled) { | |
653 | ret = -EEXIST; | |
654 | goto end; | |
655 | } | |
a0493bef | 656 | switch (event->instrumentation) { |
b4a75708 | 657 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
658 | case LTTNG_KERNEL_SYSCALL: |
659 | ret = -EINVAL; | |
660 | break; | |
b4a75708 MD |
661 | |
662 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 663 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 664 | WRITE_ONCE(event->enabled, 0); |
a0493bef | 665 | break; |
b4a75708 | 666 | |
a0493bef | 667 | case LTTNG_KERNEL_KRETPROBE: |
b4a75708 | 668 | |
a0493bef MD |
669 | ret = lttng_kretprobes_event_enable_state(event, 0); |
670 | break; | |
b4a75708 MD |
671 | |
672 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
673 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
674 | default: |
675 | WARN_ON_ONCE(1); | |
676 | ret = -EINVAL; | |
677 | } | |
3c997079 MD |
678 | end: |
679 | mutex_unlock(&sessions_mutex); | |
680 | return ret; | |
e64957da MD |
681 | } |
682 | ||
dffef45d FD |
683 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
684 | { | |
685 | int ret = 0; | |
686 | ||
687 | mutex_lock(&sessions_mutex); | |
688 | if (event_notifier->enabled) { | |
689 | ret = -EEXIST; | |
690 | goto end; | |
691 | } | |
692 | switch (event_notifier->instrumentation) { | |
b4a75708 | 693 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 694 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
695 | ret = -EINVAL; |
696 | break; | |
b4a75708 MD |
697 | |
698 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 699 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
700 | WRITE_ONCE(event_notifier->enabled, 1); |
701 | break; | |
b4a75708 MD |
702 | |
703 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
704 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
705 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
706 | default: |
707 | WARN_ON_ONCE(1); | |
708 | ret = -EINVAL; | |
709 | } | |
710 | end: | |
711 | mutex_unlock(&sessions_mutex); | |
712 | return ret; | |
713 | } | |
714 | ||
715 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
716 | { | |
717 | int ret = 0; | |
718 | ||
719 | mutex_lock(&sessions_mutex); | |
720 | if (!event_notifier->enabled) { | |
721 | ret = -EEXIST; | |
722 | goto end; | |
723 | } | |
724 | switch (event_notifier->instrumentation) { | |
b4a75708 | 725 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 726 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
727 | ret = -EINVAL; |
728 | break; | |
b4a75708 MD |
729 | |
730 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 731 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
732 | WRITE_ONCE(event_notifier->enabled, 0); |
733 | break; | |
b4a75708 MD |
734 | |
735 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
736 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
737 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
738 | default: |
739 | WARN_ON_ONCE(1); | |
740 | ret = -EINVAL; | |
741 | } | |
742 | end: | |
743 | mutex_unlock(&sessions_mutex); | |
744 | return ret; | |
745 | } | |
746 | ||
a90917c3 | 747 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
748 | const char *transport_name, |
749 | void *buf_addr, | |
4e3c1b9b MD |
750 | size_t subbuf_size, size_t num_subbuf, |
751 | unsigned int switch_timer_interval, | |
d83004aa JD |
752 | unsigned int read_timer_interval, |
753 | enum channel_type channel_type) | |
4e3c1b9b | 754 | { |
a90917c3 MD |
755 | struct lttng_channel *chan; |
756 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
757 | |
758 | mutex_lock(&sessions_mutex); | |
d83004aa | 759 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 760 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 761 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 762 | if (!transport) { |
5a15f70c | 763 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 764 | transport_name); |
c0e31d2e | 765 | goto notransport; |
f3d01b96 | 766 | } |
a33c9927 | 767 | if (!try_module_get(transport->owner)) { |
5a15f70c | 768 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
769 | goto notransport; |
770 | } | |
a90917c3 | 771 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 772 | if (!chan) |
c0e31d2e | 773 | goto nomem; |
4e3c1b9b | 774 | chan->session = session; |
05d32c64 | 775 | chan->id = session->free_chan_id++; |
3b731ab1 | 776 | chan->ops = &transport->ops; |
125b4df4 MD |
777 | /* |
778 | * Note: the channel creation op already writes into the packet | |
779 | * headers. Therefore the "chan" information used as input | |
780 | * should be already accessible. | |
781 | */ | |
5f5ddf01 MD |
782 | chan->chan = transport->ops.channel_create(transport_name, |
783 | chan, buf_addr, subbuf_size, num_subbuf, | |
784 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
785 | if (!chan->chan) |
786 | goto create_error; | |
3c997079 | 787 | chan->tstate = 1; |
e64957da | 788 | chan->enabled = 1; |
a33c9927 | 789 | chan->transport = transport; |
d83004aa | 790 | chan->channel_type = channel_type; |
4e3c1b9b MD |
791 | list_add(&chan->list, &session->chan); |
792 | mutex_unlock(&sessions_mutex); | |
793 | return chan; | |
794 | ||
f3d01b96 MD |
795 | create_error: |
796 | kfree(chan); | |
c0e31d2e | 797 | nomem: |
a33c9927 MD |
798 | if (transport) |
799 | module_put(transport->owner); | |
c0e31d2e | 800 | notransport: |
e5382b6d | 801 | active: |
4e3c1b9b MD |
802 | mutex_unlock(&sessions_mutex); |
803 | return NULL; | |
804 | } | |
805 | ||
806 | /* | |
d83004aa JD |
807 | * Only used internally at session destruction for per-cpu channels, and |
808 | * when metadata channel is released. | |
809 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 810 | */ |
aa7c23a9 | 811 | static |
a90917c3 | 812 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 813 | { |
11b5a3c2 | 814 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 815 | module_put(chan->transport->owner); |
4e3c1b9b | 816 | list_del(&chan->list); |
8070f5c0 | 817 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
818 | kfree(chan); |
819 | } | |
820 | ||
d83004aa JD |
821 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
822 | { | |
823 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
824 | ||
825 | /* Protect the metadata cache with the sessions_mutex. */ | |
826 | mutex_lock(&sessions_mutex); | |
827 | _lttng_channel_destroy(chan); | |
828 | mutex_unlock(&sessions_mutex); | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
831 | ||
832 | static | |
833 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
834 | { | |
835 | stream->finalized = 1; | |
836 | wake_up_interruptible(&stream->read_wait); | |
837 | } | |
838 | ||
a101fa10 | 839 | |
e5382b6d MD |
840 | /* |
841 | * Supports event creation while tracing session is active. | |
3c997079 | 842 | * Needs to be called with sessions mutex held. |
e5382b6d | 843 | */ |
3c997079 MD |
844 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
845 | struct lttng_kernel_event *event_param, | |
846 | void *filter, | |
847 | const struct lttng_event_desc *event_desc, | |
848 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 849 | { |
3c997079 | 850 | struct lttng_session *session = chan->session; |
a90917c3 | 851 | struct lttng_event *event; |
3c997079 MD |
852 | const char *event_name; |
853 | struct hlist_head *head; | |
3d084699 | 854 | int ret; |
4e3c1b9b | 855 | |
abc0446a | 856 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 857 | ret = -EMFILE; |
e5382b6d | 858 | goto full; |
abc0446a | 859 | } |
3c997079 MD |
860 | |
861 | switch (itype) { | |
862 | case LTTNG_KERNEL_TRACEPOINT: | |
863 | event_name = event_desc->name; | |
864 | break; | |
b4a75708 MD |
865 | |
866 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
867 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
868 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
33a39a3c | 869 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
870 | event_name = event_param->name; |
871 | break; | |
b4a75708 MD |
872 | |
873 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
874 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
3c997079 MD |
875 | default: |
876 | WARN_ON_ONCE(1); | |
877 | ret = -EINVAL; | |
878 | goto type_error; | |
879 | } | |
4a11ef1c FD |
880 | |
881 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
882 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 883 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
884 | WARN_ON_ONCE(!event->desc); |
885 | if (!strncmp(event->desc->name, event_name, | |
886 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
887 | && chan == event->chan) { | |
888 | ret = -EEXIST; | |
889 | goto exist; | |
abc0446a MD |
890 | } |
891 | } | |
3c997079 | 892 | |
11b5a3c2 | 893 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 894 | if (!event) { |
4cf0bf51 | 895 | ret = -ENOMEM; |
4e3c1b9b | 896 | goto cache_error; |
abc0446a | 897 | } |
4e3c1b9b MD |
898 | event->chan = chan; |
899 | event->filter = filter; | |
e5382b6d | 900 | event->id = chan->free_event_id++; |
3c997079 MD |
901 | event->instrumentation = itype; |
902 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 903 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
904 | INIT_LIST_HEAD(&event->enablers_ref_head); |
905 | ||
906 | switch (itype) { | |
ab2277d6 | 907 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
908 | /* Event will be enabled by enabler sync. */ |
909 | event->enabled = 0; | |
910 | event->registered = 0; | |
0bcedee9 | 911 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 912 | if (!event->desc) { |
4cf0bf51 | 913 | ret = -ENOENT; |
d3dbe23c | 914 | goto register_error; |
abc0446a | 915 | } |
3c997079 MD |
916 | /* Populate lttng_event structure before event registration. */ |
917 | smp_wmb(); | |
baf20995 | 918 | break; |
b4a75708 | 919 | |
ab2277d6 | 920 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
921 | /* |
922 | * Needs to be explicitly enabled after creation, since | |
923 | * we may want to apply filters. | |
924 | */ | |
925 | event->enabled = 0; | |
3c997079 MD |
926 | event->registered = 1; |
927 | /* | |
928 | * Populate lttng_event structure before event | |
929 | * registration. | |
930 | */ | |
931 | smp_wmb(); | |
8bf17deb | 932 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
933 | event_param->u.kprobe.symbol_name, |
934 | event_param->u.kprobe.offset, | |
935 | event_param->u.kprobe.addr, | |
936 | event); | |
abc0446a | 937 | if (ret) { |
4cf0bf51 | 938 | ret = -EINVAL; |
d6d808f3 | 939 | goto register_error; |
abc0446a | 940 | } |
edeb3137 MD |
941 | ret = try_module_get(event->desc->owner); |
942 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 943 | break; |
b4a75708 | 944 | |
7371f44c MD |
945 | case LTTNG_KERNEL_KRETPROBE: |
946 | { | |
a90917c3 | 947 | struct lttng_event *event_return; |
7371f44c MD |
948 | |
949 | /* kretprobe defines 2 events */ | |
a0493bef MD |
950 | /* |
951 | * Needs to be explicitly enabled after creation, since | |
952 | * we may want to apply filters. | |
953 | */ | |
954 | event->enabled = 0; | |
3c997079 | 955 | event->registered = 1; |
7371f44c MD |
956 | event_return = |
957 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 958 | if (!event_return) { |
4cf0bf51 | 959 | ret = -ENOMEM; |
7371f44c | 960 | goto register_error; |
abc0446a | 961 | } |
7371f44c MD |
962 | event_return->chan = chan; |
963 | event_return->filter = filter; | |
964 | event_return->id = chan->free_event_id++; | |
a0493bef | 965 | event_return->enabled = 0; |
3c997079 MD |
966 | event_return->registered = 1; |
967 | event_return->instrumentation = itype; | |
484ec217 FD |
968 | INIT_LIST_HEAD(&event_return->filter_bytecode_runtime_head); |
969 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
7371f44c | 970 | /* |
a90917c3 | 971 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
972 | */ |
973 | smp_wmb(); | |
3c997079 | 974 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
975 | event_param->u.kretprobe.symbol_name, |
976 | event_param->u.kretprobe.offset, | |
977 | event_param->u.kretprobe.addr, | |
978 | event, event_return); | |
979 | if (ret) { | |
980 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 981 | ret = -EINVAL; |
7371f44c MD |
982 | goto register_error; |
983 | } | |
984 | /* Take 2 refs on the module: one per event. */ | |
985 | ret = try_module_get(event->desc->owner); | |
986 | WARN_ON_ONCE(!ret); | |
987 | ret = try_module_get(event->desc->owner); | |
988 | WARN_ON_ONCE(!ret); | |
a90917c3 | 989 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 990 | event_return); |
abc0446a | 991 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
992 | if (ret) { |
993 | kmem_cache_free(event_cache, event_return); | |
994 | module_put(event->desc->owner); | |
995 | module_put(event->desc->owner); | |
996 | goto statedump_error; | |
997 | } | |
998 | list_add(&event_return->list, &chan->session->events); | |
999 | break; | |
1000 | } | |
b4a75708 | 1001 | |
33a39a3c | 1002 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
1003 | /* |
1004 | * Needs to be explicitly enabled after creation, since | |
1005 | * we may want to apply filters. | |
1006 | */ | |
1007 | event->enabled = 0; | |
3c997079 MD |
1008 | event->registered = 0; |
1009 | event->desc = event_desc; | |
badfe9f5 MD |
1010 | switch (event_param->u.syscall.entryexit) { |
1011 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1012 | ret = -EINVAL; | |
1013 | goto register_error; | |
1014 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1015 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1016 | break; | |
1017 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1018 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1019 | break; | |
1020 | } | |
1021 | switch (event_param->u.syscall.abi) { | |
1022 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1023 | ret = -EINVAL; | |
1024 | goto register_error; | |
1025 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1026 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1027 | break; | |
1028 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1029 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1030 | break; | |
1031 | } | |
abc0446a | 1032 | if (!event->desc) { |
4cf0bf51 | 1033 | ret = -EINVAL; |
259b6cb3 | 1034 | goto register_error; |
abc0446a | 1035 | } |
1ec65de1 | 1036 | break; |
b4a75708 | 1037 | |
149b9a9d | 1038 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1039 | /* |
1040 | * Needs to be explicitly enabled after creation, since | |
1041 | * we may want to apply filters. | |
1042 | */ | |
1043 | event->enabled = 0; | |
1044 | event->registered = 1; | |
3aed4dca | 1045 | |
a344f64b FD |
1046 | /* |
1047 | * Populate lttng_event structure before event | |
1048 | * registration. | |
1049 | */ | |
1050 | smp_wmb(); | |
149b9a9d | 1051 | |
83b802dc | 1052 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1053 | event_param->u.uprobe.fd, |
149b9a9d YB |
1054 | event); |
1055 | if (ret) | |
1056 | goto register_error; | |
1057 | ret = try_module_get(event->desc->owner); | |
1058 | WARN_ON_ONCE(!ret); | |
1059 | break; | |
b4a75708 | 1060 | |
e884017c | 1061 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1062 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
baf20995 MD |
1063 | default: |
1064 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1065 | ret = -EINVAL; |
df07930b | 1066 | goto register_error; |
baf20995 | 1067 | } |
a90917c3 | 1068 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
1069 | WARN_ON_ONCE(ret > 0); |
1070 | if (ret) { | |
c099397a | 1071 | goto statedump_error; |
abc0446a | 1072 | } |
3c997079 | 1073 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1074 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1075 | return event; |
1076 | ||
c099397a | 1077 | statedump_error: |
259b6cb3 | 1078 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1079 | register_error: |
11b5a3c2 | 1080 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1081 | cache_error: |
1082 | exist: | |
3c997079 | 1083 | type_error: |
e5382b6d | 1084 | full: |
4cf0bf51 | 1085 | return ERR_PTR(ret); |
4e3c1b9b MD |
1086 | } |
1087 | ||
dffef45d FD |
1088 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1089 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1090 | uint64_t token, uint64_t error_counter_index, |
1091 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1092 | struct lttng_kernel_event_notifier *event_notifier_param, |
1093 | void *filter, enum lttng_kernel_instrumentation itype) | |
1094 | { | |
1095 | struct lttng_event_notifier *event_notifier; | |
ab04d7b1 | 1096 | struct lttng_counter *error_counter; |
dffef45d FD |
1097 | const char *event_name; |
1098 | struct hlist_head *head; | |
1099 | int ret; | |
1100 | ||
1101 | switch (itype) { | |
1102 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1103 | event_name = event_desc->name; |
1104 | break; | |
b4a75708 MD |
1105 | |
1106 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1107 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
8a8ac9a8 | 1108 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1109 | event_name = event_notifier_param->event.name; |
1110 | break; | |
b4a75708 MD |
1111 | |
1112 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1113 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1114 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1115 | default: |
1116 | WARN_ON_ONCE(1); | |
1117 | ret = -EINVAL; | |
1118 | goto type_error; | |
1119 | } | |
1120 | ||
1121 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1122 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1123 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1124 | WARN_ON_ONCE(!event_notifier->desc); | |
1125 | if (!strncmp(event_notifier->desc->name, event_name, | |
1126 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1127 | && event_notifier_group == event_notifier->group | |
1128 | && token == event_notifier->user_token) { | |
1129 | ret = -EEXIST; | |
1130 | goto exist; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1135 | if (!event_notifier) { | |
1136 | ret = -ENOMEM; | |
1137 | goto cache_error; | |
1138 | } | |
21f58fb7 | 1139 | |
dffef45d FD |
1140 | event_notifier->group = event_notifier_group; |
1141 | event_notifier->user_token = token; | |
99f52fcc | 1142 | event_notifier->error_counter_index = error_counter_index; |
99d223ad | 1143 | event_notifier->num_captures = 0; |
dffef45d FD |
1144 | event_notifier->filter = filter; |
1145 | event_notifier->instrumentation = itype; | |
1146 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1147 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1148 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1149 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1150 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1151 | ||
1152 | switch (itype) { | |
1153 | case LTTNG_KERNEL_TRACEPOINT: | |
1154 | /* Event will be enabled by enabler sync. */ | |
1155 | event_notifier->enabled = 0; | |
1156 | event_notifier->registered = 0; | |
1157 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1158 | if (!event_notifier->desc) { | |
1159 | ret = -ENOENT; | |
1160 | goto register_error; | |
1161 | } | |
1162 | /* Populate lttng_event_notifier structure before event registration. */ | |
1163 | smp_wmb(); | |
1164 | break; | |
b4a75708 | 1165 | |
dffef45d | 1166 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1167 | /* |
1168 | * Needs to be explicitly enabled after creation, since | |
1169 | * we may want to apply filters. | |
1170 | */ | |
1171 | event_notifier->enabled = 0; | |
1172 | event_notifier->registered = 1; | |
1173 | /* | |
1174 | * Populate lttng_event_notifier structure before event | |
1175 | * registration. | |
1176 | */ | |
1177 | smp_wmb(); | |
1178 | ret = lttng_kprobes_register_event_notifier( | |
1179 | event_notifier_param->event.u.kprobe.symbol_name, | |
1180 | event_notifier_param->event.u.kprobe.offset, | |
1181 | event_notifier_param->event.u.kprobe.addr, | |
1182 | event_notifier); | |
1183 | if (ret) { | |
1184 | ret = -EINVAL; | |
1185 | goto register_error; | |
1186 | } | |
1187 | ret = try_module_get(event_notifier->desc->owner); | |
1188 | WARN_ON_ONCE(!ret); | |
1189 | break; | |
b4a75708 | 1190 | |
8a8ac9a8 FD |
1191 | case LTTNG_KERNEL_SYSCALL: |
1192 | /* | |
1193 | * Needs to be explicitly enabled after creation, since | |
1194 | * we may want to apply filters. | |
1195 | */ | |
1196 | event_notifier->enabled = 0; | |
1197 | event_notifier->registered = 0; | |
1198 | event_notifier->desc = event_desc; | |
1199 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1200 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1201 | ret = -EINVAL; | |
1202 | goto register_error; | |
1203 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1204 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1205 | break; | |
1206 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1207 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1208 | break; | |
1209 | } | |
1210 | switch (event_notifier_param->event.u.syscall.abi) { | |
1211 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1212 | ret = -EINVAL; | |
1213 | goto register_error; | |
1214 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1215 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1216 | break; | |
1217 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1218 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1219 | break; | |
1220 | } | |
1221 | ||
1222 | if (!event_notifier->desc) { | |
1223 | ret = -EINVAL; | |
1224 | goto register_error; | |
1225 | } | |
1226 | break; | |
b4a75708 | 1227 | |
dffef45d | 1228 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1229 | /* |
1230 | * Needs to be explicitly enabled after creation, since | |
1231 | * we may want to apply filters. | |
1232 | */ | |
1233 | event_notifier->enabled = 0; | |
1234 | event_notifier->registered = 1; | |
1235 | ||
1236 | /* | |
1237 | * Populate lttng_event_notifier structure before | |
1238 | * event_notifier registration. | |
1239 | */ | |
1240 | smp_wmb(); | |
1241 | ||
1242 | ret = lttng_uprobes_register_event_notifier( | |
1243 | event_notifier_param->event.name, | |
1244 | event_notifier_param->event.u.uprobe.fd, | |
1245 | event_notifier); | |
1246 | if (ret) | |
1247 | goto register_error; | |
1248 | ret = try_module_get(event_notifier->desc->owner); | |
1249 | WARN_ON_ONCE(!ret); | |
1250 | break; | |
b4a75708 MD |
1251 | |
1252 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1253 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1254 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1255 | default: |
1256 | WARN_ON_ONCE(1); | |
1257 | ret = -EINVAL; | |
1258 | goto register_error; | |
1259 | } | |
1260 | ||
1261 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1262 | hlist_add_head(&event_notifier->hlist, head); | |
99f52fcc FD |
1263 | |
1264 | /* | |
1265 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1266 | * bucket is currently in use. We trust it. The session lock |
1267 | * synchronizes against concurrent creation of the error | |
1268 | * counter. | |
99f52fcc | 1269 | */ |
ab04d7b1 MD |
1270 | error_counter = event_notifier_group->error_counter; |
1271 | if (error_counter) { | |
99f52fcc FD |
1272 | size_t dimension_index[1]; |
1273 | ||
1274 | /* | |
1275 | * Check that the index is within the boundary of the counter. | |
1276 | */ | |
1277 | if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) { | |
1278 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1279 | event_notifier_group->error_counter_len, event_notifier->error_counter_index); | |
1280 | ret = -EINVAL; | |
1281 | goto register_error; | |
1282 | } | |
1283 | ||
1284 | dimension_index[0] = event_notifier->error_counter_index; | |
ab04d7b1 | 1285 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1286 | if (ret) { |
1287 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1288 | event_notifier->error_counter_index); | |
1289 | goto register_error; | |
1290 | } | |
1291 | } | |
1292 | ||
dffef45d FD |
1293 | return event_notifier; |
1294 | ||
1295 | register_error: | |
1296 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1297 | cache_error: | |
1298 | exist: | |
1299 | type_error: | |
1300 | return ERR_PTR(ret); | |
1301 | } | |
1302 | ||
99f52fcc FD |
1303 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1304 | const size_t *dim_indexes, int32_t cpu, | |
1305 | int64_t *val, bool *overflow, bool *underflow) | |
1306 | { | |
1307 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1308 | cpu, val, overflow, underflow); | |
1309 | } | |
1310 | ||
1311 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1312 | const size_t *dim_indexes, int64_t *val, | |
1313 | bool *overflow, bool *underflow) | |
1314 | { | |
1315 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1316 | val, overflow, underflow); | |
1317 | } | |
1318 | ||
1319 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1320 | const size_t *dim_indexes) | |
1321 | { | |
1322 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1323 | } | |
1324 | ||
3c997079 MD |
1325 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1326 | struct lttng_kernel_event *event_param, | |
1327 | void *filter, | |
1328 | const struct lttng_event_desc *event_desc, | |
1329 | enum lttng_kernel_instrumentation itype) | |
1330 | { | |
1331 | struct lttng_event *event; | |
1332 | ||
1333 | mutex_lock(&sessions_mutex); | |
1334 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1335 | itype); | |
1336 | mutex_unlock(&sessions_mutex); | |
1337 | return event; | |
1338 | } | |
1339 | ||
dffef45d FD |
1340 | struct lttng_event_notifier *lttng_event_notifier_create( |
1341 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1342 | uint64_t id, uint64_t error_counter_index, |
1343 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1344 | struct lttng_kernel_event_notifier *event_notifier_param, |
1345 | void *filter, enum lttng_kernel_instrumentation itype) | |
1346 | { | |
1347 | struct lttng_event_notifier *event_notifier; | |
1348 | ||
1349 | mutex_lock(&sessions_mutex); | |
1350 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc FD |
1351 | error_counter_index, event_notifier_group, |
1352 | event_notifier_param, filter, itype); | |
dffef45d FD |
1353 | mutex_unlock(&sessions_mutex); |
1354 | return event_notifier; | |
1355 | } | |
1356 | ||
3c997079 MD |
1357 | /* Only used for tracepoints for now. */ |
1358 | static | |
1359 | void register_event(struct lttng_event *event) | |
1360 | { | |
1361 | const struct lttng_event_desc *desc; | |
f127e61e | 1362 | int ret = -EINVAL; |
3c997079 | 1363 | |
3c997079 MD |
1364 | if (event->registered) |
1365 | return; | |
4ecb5ad5 | 1366 | |
3c997079 | 1367 | desc = event->desc; |
4ecb5ad5 MD |
1368 | switch (event->instrumentation) { |
1369 | case LTTNG_KERNEL_TRACEPOINT: | |
1370 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1371 | desc->probe_callback, | |
1372 | event); | |
1373 | break; | |
b4a75708 | 1374 | |
4ecb5ad5 | 1375 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1376 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 | 1377 | break; |
b4a75708 MD |
1378 | |
1379 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1380 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
4ecb5ad5 | 1381 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1382 | ret = 0; |
1383 | break; | |
b4a75708 | 1384 | |
e884017c | 1385 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1386 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
4ecb5ad5 MD |
1387 | default: |
1388 | WARN_ON_ONCE(1); | |
1389 | } | |
3c997079 MD |
1390 | if (!ret) |
1391 | event->registered = 1; | |
1392 | } | |
1393 | ||
4e3c1b9b MD |
1394 | /* |
1395 | * Only used internally at session destruction. | |
1396 | */ | |
a90917c3 | 1397 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1398 | { |
4ecb5ad5 | 1399 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1400 | int ret = -EINVAL; |
1401 | ||
3c997079 MD |
1402 | if (!event->registered) |
1403 | return 0; | |
1404 | ||
4ecb5ad5 | 1405 | desc = event->desc; |
38d024ae | 1406 | switch (event->instrumentation) { |
ab2277d6 | 1407 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1408 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1409 | event->desc->probe_callback, |
11b5a3c2 | 1410 | event); |
baf20995 | 1411 | break; |
b4a75708 | 1412 | |
ab2277d6 | 1413 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1414 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1415 | ret = 0; |
1416 | break; | |
b4a75708 | 1417 | |
7371f44c MD |
1418 | case LTTNG_KERNEL_KRETPROBE: |
1419 | lttng_kretprobes_unregister(event); | |
1420 | ret = 0; | |
1421 | break; | |
b4a75708 | 1422 | |
33a39a3c | 1423 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1424 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 | 1425 | break; |
b4a75708 | 1426 | |
4ecb5ad5 | 1427 | case LTTNG_KERNEL_NOOP: |
259b6cb3 MD |
1428 | ret = 0; |
1429 | break; | |
b4a75708 | 1430 | |
149b9a9d | 1431 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1432 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1433 | ret = 0; |
1434 | break; | |
b4a75708 | 1435 | |
e884017c | 1436 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1437 | default: |
1438 | WARN_ON_ONCE(1); | |
1439 | } | |
3c997079 MD |
1440 | if (!ret) |
1441 | event->registered = 0; | |
dda6a249 MD |
1442 | return ret; |
1443 | } | |
1444 | ||
dffef45d FD |
1445 | /* Only used for tracepoints for now. */ |
1446 | static | |
b01155ba | 1447 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1448 | { |
1449 | const struct lttng_event_desc *desc; | |
1450 | int ret = -EINVAL; | |
1451 | ||
1452 | if (event_notifier->registered) | |
1453 | return; | |
1454 | ||
1455 | desc = event_notifier->desc; | |
1456 | switch (event_notifier->instrumentation) { | |
1457 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1458 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1459 | desc->event_notifier_callback, | |
1460 | event_notifier); | |
1461 | break; | |
b4a75708 | 1462 | |
8a8ac9a8 FD |
1463 | case LTTNG_KERNEL_SYSCALL: |
1464 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1465 | break; | |
b4a75708 MD |
1466 | |
1467 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 1468 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1469 | ret = 0; |
1470 | break; | |
b4a75708 MD |
1471 | |
1472 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1473 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1474 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1475 | default: |
1476 | WARN_ON_ONCE(1); | |
1477 | } | |
1478 | if (!ret) | |
1479 | event_notifier->registered = 1; | |
1480 | } | |
1481 | ||
1482 | static | |
1483 | int _lttng_event_notifier_unregister( | |
1484 | struct lttng_event_notifier *event_notifier) | |
1485 | { | |
1486 | const struct lttng_event_desc *desc; | |
1487 | int ret = -EINVAL; | |
1488 | ||
1489 | if (!event_notifier->registered) | |
1490 | return 0; | |
1491 | ||
1492 | desc = event_notifier->desc; | |
1493 | switch (event_notifier->instrumentation) { | |
1494 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1495 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1496 | event_notifier->desc->event_notifier_callback, | |
1497 | event_notifier); | |
1498 | break; | |
b4a75708 | 1499 | |
dffef45d | 1500 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1501 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1502 | ret = 0; | |
1503 | break; | |
b4a75708 | 1504 | |
9de67196 FD |
1505 | case LTTNG_KERNEL_UPROBE: |
1506 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1507 | ret = 0; | |
1508 | break; | |
b4a75708 | 1509 | |
8a8ac9a8 FD |
1510 | case LTTNG_KERNEL_SYSCALL: |
1511 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1512 | break; | |
b4a75708 MD |
1513 | |
1514 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1515 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1516 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1517 | default: |
1518 | WARN_ON_ONCE(1); | |
1519 | } | |
1520 | if (!ret) | |
1521 | event_notifier->registered = 0; | |
1522 | return ret; | |
1523 | } | |
1524 | ||
dda6a249 MD |
1525 | /* |
1526 | * Only used internally at session destruction. | |
1527 | */ | |
be066e6c | 1528 | static |
a90917c3 | 1529 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1530 | { |
966ad253 MD |
1531 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1532 | ||
edeb3137 MD |
1533 | switch (event->instrumentation) { |
1534 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1535 | lttng_event_desc_put(event->desc); |
edeb3137 | 1536 | break; |
b4a75708 | 1537 | |
edeb3137 MD |
1538 | case LTTNG_KERNEL_KPROBE: |
1539 | module_put(event->desc->owner); | |
8bf17deb | 1540 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1541 | break; |
b4a75708 | 1542 | |
7371f44c MD |
1543 | case LTTNG_KERNEL_KRETPROBE: |
1544 | module_put(event->desc->owner); | |
1545 | lttng_kretprobes_destroy_private(event); | |
1546 | break; | |
b4a75708 | 1547 | |
33a39a3c | 1548 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1549 | break; |
b4a75708 | 1550 | |
149b9a9d YB |
1551 | case LTTNG_KERNEL_UPROBE: |
1552 | module_put(event->desc->owner); | |
83b802dc | 1553 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1554 | break; |
b4a75708 | 1555 | |
e884017c | 1556 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1557 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
edeb3137 MD |
1558 | default: |
1559 | WARN_ON_ONCE(1); | |
1560 | } | |
dda6a249 | 1561 | list_del(&event->list); |
8070f5c0 | 1562 | lttng_destroy_context(event->ctx); |
966ad253 MD |
1563 | lttng_free_event_filter_runtime(event); |
1564 | /* Free event enabler refs */ | |
1565 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1566 | &event->enablers_ref_head, node) | |
1567 | kfree(enabler_ref); | |
11b5a3c2 | 1568 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1569 | } |
1570 | ||
dffef45d FD |
1571 | /* |
1572 | * Only used internally at session destruction. | |
1573 | */ | |
1574 | static | |
1575 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1576 | { | |
3ef5cc03 MD |
1577 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1578 | ||
dffef45d FD |
1579 | switch (event_notifier->instrumentation) { |
1580 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1581 | lttng_event_desc_put(event_notifier->desc); |
1582 | break; | |
b4a75708 | 1583 | |
dffef45d | 1584 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1585 | module_put(event_notifier->desc->owner); |
1586 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1587 | break; | |
b4a75708 | 1588 | |
8a8ac9a8 FD |
1589 | case LTTNG_KERNEL_SYSCALL: |
1590 | break; | |
b4a75708 | 1591 | |
9de67196 FD |
1592 | case LTTNG_KERNEL_UPROBE: |
1593 | module_put(event_notifier->desc->owner); | |
1594 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1595 | break; | |
b4a75708 MD |
1596 | |
1597 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1598 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1599 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1600 | default: |
1601 | WARN_ON_ONCE(1); | |
1602 | } | |
1603 | list_del(&event_notifier->list); | |
3ef5cc03 MD |
1604 | lttng_free_event_notifier_filter_runtime(event_notifier); |
1605 | /* Free event enabler refs */ | |
1606 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1607 | &event_notifier->enablers_ref_head, node) | |
1608 | kfree(enabler_ref); | |
dffef45d FD |
1609 | kmem_cache_free(event_notifier_cache, event_notifier); |
1610 | } | |
1611 | ||
d1f652f8 MD |
1612 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1613 | enum tracker_type tracker_type) | |
e0130fab | 1614 | { |
d1f652f8 MD |
1615 | switch (tracker_type) { |
1616 | case TRACKER_PID: | |
1617 | return &session->pid_tracker; | |
1618 | case TRACKER_VPID: | |
1619 | return &session->vpid_tracker; | |
1620 | case TRACKER_UID: | |
1621 | return &session->uid_tracker; | |
1622 | case TRACKER_VUID: | |
1623 | return &session->vuid_tracker; | |
1624 | case TRACKER_GID: | |
1625 | return &session->gid_tracker; | |
1626 | case TRACKER_VGID: | |
1627 | return &session->vgid_tracker; | |
1628 | default: | |
1629 | WARN_ON_ONCE(1); | |
1630 | return NULL; | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | int lttng_session_track_id(struct lttng_session *session, | |
1635 | enum tracker_type tracker_type, int id) | |
1636 | { | |
1637 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1638 | int ret; |
1639 | ||
d1f652f8 MD |
1640 | tracker = get_tracker(session, tracker_type); |
1641 | if (!tracker) | |
1642 | return -EINVAL; | |
1643 | if (id < -1) | |
e0130fab MD |
1644 | return -EINVAL; |
1645 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1646 | if (id == -1) { |
1647 | /* track all ids: destroy tracker. */ | |
1648 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1649 | ret = 0; |
1650 | } else { | |
d1f652f8 | 1651 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1652 | } |
e0130fab MD |
1653 | mutex_unlock(&sessions_mutex); |
1654 | return ret; | |
1655 | } | |
1656 | ||
d1f652f8 MD |
1657 | int lttng_session_untrack_id(struct lttng_session *session, |
1658 | enum tracker_type tracker_type, int id) | |
e0130fab | 1659 | { |
d1f652f8 | 1660 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1661 | int ret; |
1662 | ||
d1f652f8 MD |
1663 | tracker = get_tracker(session, tracker_type); |
1664 | if (!tracker) | |
1665 | return -EINVAL; | |
1666 | if (id < -1) | |
e0130fab MD |
1667 | return -EINVAL; |
1668 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1669 | if (id == -1) { |
1670 | /* untrack all ids: replace by empty tracker. */ | |
1671 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1672 | } else { |
d1f652f8 | 1673 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1674 | } |
e0130fab MD |
1675 | mutex_unlock(&sessions_mutex); |
1676 | return ret; | |
1677 | } | |
1678 | ||
7e6f9ef6 | 1679 | static |
d1f652f8 | 1680 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1681 | { |
d1f652f8 MD |
1682 | struct lttng_id_tracker *id_tracker = m->private; |
1683 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1684 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1685 | int iter = 0, i; |
1686 | ||
1687 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1688 | if (id_tracker_p) { |
1689 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1690 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1691 | |
f934e302 | 1692 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1693 | if (iter++ >= *pos) |
1694 | return e; | |
1695 | } | |
1696 | } | |
1697 | } else { | |
d1f652f8 | 1698 | /* ID tracker disabled. */ |
7e6f9ef6 | 1699 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1700 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1701 | } |
1702 | iter++; | |
1703 | } | |
1704 | /* End of list */ | |
1705 | return NULL; | |
1706 | } | |
1707 | ||
1708 | /* Called with sessions_mutex held. */ | |
1709 | static | |
d1f652f8 | 1710 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1711 | { |
d1f652f8 MD |
1712 | struct lttng_id_tracker *id_tracker = m->private; |
1713 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1714 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1715 | int iter = 0, i; |
1716 | ||
1717 | (*ppos)++; | |
d1f652f8 MD |
1718 | if (id_tracker_p) { |
1719 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1720 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1721 | |
f934e302 | 1722 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1723 | if (iter++ >= *ppos) |
1724 | return e; | |
1725 | } | |
1726 | } | |
1727 | } else { | |
d1f652f8 | 1728 | /* ID tracker disabled. */ |
7e6f9ef6 | 1729 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1730 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1731 | iter++; |
1732 | } | |
1733 | ||
1734 | /* End of list */ | |
1735 | return NULL; | |
1736 | } | |
1737 | ||
1738 | static | |
d1f652f8 | 1739 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1740 | { |
1741 | mutex_unlock(&sessions_mutex); | |
1742 | } | |
1743 | ||
1744 | static | |
d1f652f8 | 1745 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1746 | { |
d1f652f8 MD |
1747 | struct lttng_id_tracker *id_tracker = m->private; |
1748 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1749 | int id; | |
7e6f9ef6 | 1750 | |
d1f652f8 | 1751 | if (p == id_tracker_p) { |
7e6f9ef6 | 1752 | /* Tracker disabled. */ |
d1f652f8 | 1753 | id = -1; |
7e6f9ef6 | 1754 | } else { |
d1f652f8 | 1755 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1756 | |
d1f652f8 MD |
1757 | id = lttng_id_tracker_get_node_id(e); |
1758 | } | |
1759 | switch (id_tracker->tracker_type) { | |
1760 | case TRACKER_PID: | |
1761 | seq_printf(m, "process { pid = %d; };\n", id); | |
1762 | break; | |
1763 | case TRACKER_VPID: | |
1764 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1765 | break; | |
1766 | case TRACKER_UID: | |
1767 | seq_printf(m, "user { uid = %d; };\n", id); | |
1768 | break; | |
1769 | case TRACKER_VUID: | |
1770 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1771 | break; | |
1772 | case TRACKER_GID: | |
1773 | seq_printf(m, "group { gid = %d; };\n", id); | |
1774 | break; | |
1775 | case TRACKER_VGID: | |
1776 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1777 | break; | |
1778 | default: | |
1779 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1780 | } |
7e6f9ef6 MD |
1781 | return 0; |
1782 | } | |
1783 | ||
1784 | static | |
d1f652f8 MD |
1785 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1786 | .start = id_list_start, | |
1787 | .next = id_list_next, | |
1788 | .stop = id_list_stop, | |
1789 | .show = id_list_show, | |
7e6f9ef6 MD |
1790 | }; |
1791 | ||
1792 | static | |
d1f652f8 | 1793 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1794 | { |
d1f652f8 | 1795 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1796 | } |
1797 | ||
1798 | static | |
d1f652f8 | 1799 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1800 | { |
1801 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1802 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1803 | int ret; |
1804 | ||
d1f652f8 | 1805 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1806 | ret = seq_release(inode, file); |
d1f652f8 MD |
1807 | if (!ret) |
1808 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1809 | return ret; |
1810 | } | |
1811 | ||
d1f652f8 | 1812 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1813 | .owner = THIS_MODULE, |
d1f652f8 | 1814 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1815 | .read = seq_read, |
1816 | .llseek = seq_lseek, | |
d1f652f8 | 1817 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1818 | }; |
1819 | ||
d1f652f8 MD |
1820 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1821 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1822 | { |
d1f652f8 | 1823 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1824 | struct seq_file *m; |
1825 | int file_fd, ret; | |
1826 | ||
1827 | file_fd = lttng_get_unused_fd(); | |
1828 | if (file_fd < 0) { | |
1829 | ret = file_fd; | |
1830 | goto fd_error; | |
1831 | } | |
1832 | ||
d1f652f8 MD |
1833 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1834 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1835 | NULL, O_RDWR); |
d1f652f8 MD |
1836 | if (IS_ERR(tracker_ids_list_file)) { |
1837 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1838 | goto file_error; |
1839 | } | |
98d7281c MJ |
1840 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1841 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1842 | goto refcount_error; |
1843 | } | |
d1f652f8 | 1844 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1845 | if (ret < 0) |
1846 | goto open_error; | |
d1f652f8 MD |
1847 | m = tracker_ids_list_file->private_data; |
1848 | ||
1849 | m->private = get_tracker(session, tracker_type); | |
1850 | BUG_ON(!m->private); | |
1851 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1852 | |
1853 | return file_fd; | |
1854 | ||
1855 | open_error: | |
9c1f4643 MD |
1856 | atomic_long_dec(&session->file->f_count); |
1857 | refcount_error: | |
d1f652f8 | 1858 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1859 | file_error: |
1860 | put_unused_fd(file_fd); | |
1861 | fd_error: | |
1862 | return ret; | |
1863 | } | |
1864 | ||
3c997079 MD |
1865 | /* |
1866 | * Enabler management. | |
1867 | */ | |
1868 | static | |
4993071a PP |
1869 | int lttng_match_enabler_star_glob(const char *desc_name, |
1870 | const char *pattern) | |
3c997079 | 1871 | { |
cbc19040 MD |
1872 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1873 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1874 | return 0; |
1875 | return 1; | |
1876 | } | |
1877 | ||
1878 | static | |
4ecb5ad5 MD |
1879 | int lttng_match_enabler_name(const char *desc_name, |
1880 | const char *name) | |
3c997079 | 1881 | { |
4ecb5ad5 | 1882 | if (strcmp(desc_name, name)) |
3c997079 MD |
1883 | return 0; |
1884 | return 1; | |
1885 | } | |
1886 | ||
3c997079 MD |
1887 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1888 | struct lttng_enabler *enabler) | |
1889 | { | |
4ecb5ad5 | 1890 | const char *desc_name, *enabler_name; |
badfe9f5 | 1891 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1892 | |
1893 | enabler_name = enabler->event_param.name; | |
1894 | switch (enabler->event_param.instrumentation) { | |
1895 | case LTTNG_KERNEL_TRACEPOINT: | |
1896 | desc_name = desc->name; | |
3b861b22 FD |
1897 | switch (enabler->format_type) { |
1898 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1899 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1900 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1901 | return lttng_match_enabler_name(desc_name, enabler_name); |
1902 | default: | |
1903 | return -EINVAL; | |
1904 | } | |
4ecb5ad5 | 1905 | break; |
b4a75708 | 1906 | |
4ecb5ad5 MD |
1907 | case LTTNG_KERNEL_SYSCALL: |
1908 | desc_name = desc->name; | |
badfe9f5 | 1909 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1910 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1911 | compat = true; |
1912 | } | |
4ecb5ad5 MD |
1913 | if (!strncmp(desc_name, "syscall_exit_", |
1914 | strlen("syscall_exit_"))) { | |
1915 | desc_name += strlen("syscall_exit_"); | |
1916 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1917 | strlen("syscall_entry_"))) { | |
1918 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1919 | entry = true; |
4ecb5ad5 MD |
1920 | } else { |
1921 | WARN_ON_ONCE(1); | |
1922 | return -EINVAL; | |
1923 | } | |
badfe9f5 MD |
1924 | switch (enabler->event_param.u.syscall.entryexit) { |
1925 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1926 | break; | |
1927 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1928 | if (!entry) | |
1929 | return 0; | |
1930 | break; | |
1931 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1932 | if (entry) | |
1933 | return 0; | |
1934 | break; | |
1935 | default: | |
1936 | return -EINVAL; | |
1937 | } | |
1938 | switch (enabler->event_param.u.syscall.abi) { | |
1939 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1940 | break; | |
1941 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1942 | if (compat) | |
1943 | return 0; | |
1944 | break; | |
1945 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1946 | if (!compat) | |
1947 | return 0; | |
1948 | break; | |
1949 | default: | |
1950 | return -EINVAL; | |
1951 | } | |
1952 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1953 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1954 | switch (enabler->format_type) { |
1955 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1956 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1957 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1958 | return lttng_match_enabler_name(desc_name, enabler_name); |
1959 | default: | |
1960 | return -EINVAL; | |
1961 | } | |
1962 | break; | |
cff6938b | 1963 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1964 | return -EINVAL; /* Not implemented. */ |
1965 | default: | |
1966 | return -EINVAL; | |
1967 | } | |
4ecb5ad5 | 1968 | break; |
b4a75708 | 1969 | |
4ecb5ad5 MD |
1970 | default: |
1971 | WARN_ON_ONCE(1); | |
1972 | return -EINVAL; | |
1973 | } | |
3c997079 MD |
1974 | } |
1975 | ||
1976 | static | |
b2bc0bc8 FD |
1977 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1978 | struct lttng_event *event) | |
3c997079 | 1979 | { |
b2bc0bc8 FD |
1980 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1981 | event_enabler); | |
1982 | ||
1983 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1984 | return 0; |
b2bc0bc8 FD |
1985 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1986 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1987 | return 1; |
1988 | else | |
1989 | return 0; | |
1990 | } | |
1991 | ||
b01155ba FD |
1992 | static |
1993 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1994 | struct lttng_event_notifier *event_notifier) | |
1995 | { | |
1996 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1997 | event_notifier_enabler); | |
1998 | ||
1999 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
2000 | return 0; | |
2001 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
2002 | && event_notifier->group == event_notifier_enabler->group | |
2003 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2004 | return 1; | |
2005 | else | |
2006 | return 0; | |
2007 | } | |
2008 | ||
3c997079 | 2009 | static |
b2bc0bc8 FD |
2010 | struct lttng_enabler_ref *lttng_enabler_ref( |
2011 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2012 | struct lttng_enabler *enabler) |
2013 | { | |
2014 | struct lttng_enabler_ref *enabler_ref; | |
2015 | ||
b2bc0bc8 | 2016 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2017 | if (enabler_ref->ref == enabler) |
2018 | return enabler_ref; | |
2019 | } | |
2020 | return NULL; | |
2021 | } | |
2022 | ||
3c997079 | 2023 | static |
1b917d6b | 2024 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2025 | { |
b2bc0bc8 | 2026 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
2027 | struct lttng_probe_desc *probe_desc; |
2028 | const struct lttng_event_desc *desc; | |
2029 | int i; | |
2030 | struct list_head *probe_list; | |
2031 | ||
2032 | probe_list = lttng_get_probe_list_head(); | |
2033 | /* | |
2034 | * For each probe event, if we find that a probe event matches | |
2035 | * our enabler, create an associated lttng_event if not | |
2036 | * already present. | |
2037 | */ | |
2038 | list_for_each_entry(probe_desc, probe_list, head) { | |
2039 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2040 | int found = 0; | |
2041 | struct hlist_head *head; | |
3c997079 MD |
2042 | struct lttng_event *event; |
2043 | ||
2044 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2045 | if (!lttng_desc_match_enabler(desc, |
2046 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2047 | continue; |
3c997079 MD |
2048 | |
2049 | /* | |
2050 | * Check if already created. | |
2051 | */ | |
4a11ef1c FD |
2052 | head = utils_borrow_hash_table_bucket( |
2053 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
2054 | desc->name); | |
d216ecae | 2055 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 2056 | if (event->desc == desc |
b2bc0bc8 | 2057 | && event->chan == event_enabler->chan) |
3c997079 MD |
2058 | found = 1; |
2059 | } | |
2060 | if (found) | |
2061 | continue; | |
2062 | ||
2063 | /* | |
2064 | * We need to create an event for this | |
2065 | * event probe. | |
2066 | */ | |
b2bc0bc8 | 2067 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
2068 | NULL, NULL, desc, |
2069 | LTTNG_KERNEL_TRACEPOINT); | |
2070 | if (!event) { | |
5a15f70c | 2071 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
2072 | probe_desc->event_desc[i]->name); |
2073 | } | |
2074 | } | |
2075 | } | |
2076 | } | |
2077 | ||
b01155ba FD |
2078 | static |
2079 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2080 | { | |
2081 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2082 | struct lttng_probe_desc *probe_desc; | |
2083 | const struct lttng_event_desc *desc; | |
2084 | int i; | |
2085 | struct list_head *probe_list; | |
2086 | ||
2087 | probe_list = lttng_get_probe_list_head(); | |
2088 | /* | |
2089 | * For each probe event, if we find that a probe event matches | |
2090 | * our enabler, create an associated lttng_event_notifier if not | |
2091 | * already present. | |
2092 | */ | |
2093 | list_for_each_entry(probe_desc, probe_list, head) { | |
2094 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2095 | int found = 0; | |
2096 | struct hlist_head *head; | |
2097 | struct lttng_event_notifier *event_notifier; | |
2098 | ||
2099 | desc = probe_desc->event_desc[i]; | |
2100 | if (!lttng_desc_match_enabler(desc, | |
2101 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2102 | continue; | |
2103 | ||
2104 | /* | |
2105 | * Check if already created. | |
2106 | */ | |
2107 | head = utils_borrow_hash_table_bucket( | |
2108 | event_notifier_group->event_notifiers_ht.table, | |
2109 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
2110 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
2111 | if (event_notifier->desc == desc | |
2112 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2113 | found = 1; | |
2114 | } | |
2115 | if (found) | |
2116 | continue; | |
2117 | ||
2118 | /* | |
2119 | * We need to create a event_notifier for this event probe. | |
2120 | */ | |
2121 | event_notifier = _lttng_event_notifier_create(desc, | |
2122 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2123 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2124 | event_notifier_group, NULL, NULL, |
2125 | LTTNG_KERNEL_TRACEPOINT); | |
2126 | if (IS_ERR(event_notifier)) { | |
2127 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
2128 | probe_desc->event_desc[i]->name); | |
2129 | } | |
2130 | } | |
2131 | } | |
2132 | } | |
2133 | ||
33a39a3c | 2134 | static |
1b917d6b | 2135 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2136 | { |
2137 | int ret; | |
2138 | ||
3b82c4e1 | 2139 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2140 | WARN_ON_ONCE(ret); |
2141 | } | |
2142 | ||
8a8ac9a8 FD |
2143 | static |
2144 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2145 | { | |
2146 | int ret; | |
2147 | ||
2148 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2149 | WARN_ON_ONCE(ret); | |
2150 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2151 | WARN_ON_ONCE(ret); | |
2152 | } | |
2153 | ||
33a39a3c MD |
2154 | /* |
2155 | * Create struct lttng_event if it is missing and present in the list of | |
2156 | * tracepoint probes. | |
2157 | * Should be called with sessions mutex held. | |
2158 | */ | |
2159 | static | |
b2bc0bc8 | 2160 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2161 | { |
b2bc0bc8 | 2162 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2163 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2164 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2165 | break; |
b4a75708 | 2166 | |
33a39a3c | 2167 | case LTTNG_KERNEL_SYSCALL: |
1b917d6b | 2168 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2169 | break; |
b4a75708 | 2170 | |
33a39a3c MD |
2171 | default: |
2172 | WARN_ON_ONCE(1); | |
2173 | break; | |
2174 | } | |
2175 | } | |
2176 | ||
3c997079 | 2177 | /* |
b2bc0bc8 | 2178 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2179 | * and add backward reference from the event to the enabler. |
2180 | * Should be called with sessions mutex held. | |
2181 | */ | |
2182 | static | |
b2bc0bc8 | 2183 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2184 | { |
b2bc0bc8 FD |
2185 | struct lttng_channel *chan = event_enabler->chan; |
2186 | struct lttng_session *session = event_enabler->chan->session; | |
2187 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2188 | struct lttng_event *event; |
2189 | ||
b2bc0bc8 | 2190 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2191 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2192 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2193 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2194 | int enabled = base_enabler->enabled; |
2195 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2196 | ||
2197 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2198 | WRITE_ONCE(chan->syscall_all_entry, enabled); | |
2199 | ||
2200 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2201 | WRITE_ONCE(chan->syscall_all_exit, enabled); | |
badfe9f5 MD |
2202 | } |
2203 | ||
3c997079 | 2204 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2205 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2206 | |
b2bc0bc8 | 2207 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2208 | list_for_each_entry(event, &session->events, list) { |
2209 | struct lttng_enabler_ref *enabler_ref; | |
2210 | ||
b2bc0bc8 | 2211 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2212 | continue; |
b2bc0bc8 FD |
2213 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2214 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2215 | if (!enabler_ref) { |
2216 | /* | |
2217 | * If no backward ref, create it. | |
b2bc0bc8 | 2218 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2219 | */ |
2220 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2221 | if (!enabler_ref) | |
2222 | return -ENOMEM; | |
b2bc0bc8 | 2223 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2224 | list_add(&enabler_ref->node, |
2225 | &event->enablers_ref_head); | |
2226 | } | |
2227 | ||
f127e61e MD |
2228 | /* |
2229 | * Link filter bytecodes if not linked yet. | |
2230 | */ | |
2dfda770 FD |
2231 | lttng_enabler_link_bytecode(event->desc, |
2232 | lttng_static_ctx, | |
183e8b3a | 2233 | &event->filter_bytecode_runtime_head, |
60206944 | 2234 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2235 | |
3c997079 MD |
2236 | /* TODO: merge event context. */ |
2237 | } | |
2238 | return 0; | |
2239 | } | |
2240 | ||
b01155ba FD |
2241 | /* |
2242 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2243 | * tracepoint probes. | |
2244 | * Should be called with sessions mutex held. | |
2245 | */ | |
2246 | static | |
2247 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2248 | { | |
2249 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2250 | case LTTNG_KERNEL_TRACEPOINT: | |
2251 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2252 | break; | |
b4a75708 | 2253 | |
8a8ac9a8 FD |
2254 | case LTTNG_KERNEL_SYSCALL: |
2255 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2256 | break; | |
b4a75708 | 2257 | |
b01155ba FD |
2258 | default: |
2259 | WARN_ON_ONCE(1); | |
2260 | break; | |
2261 | } | |
2262 | } | |
2263 | ||
2264 | /* | |
2265 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2266 | */ | |
2267 | static | |
8a8ac9a8 FD |
2268 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2269 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2270 | { |
2271 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2272 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2273 | struct lttng_event_notifier *event_notifier; |
2274 | ||
8a8ac9a8 FD |
2275 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2276 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2277 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2278 | !strcmp(base_enabler->event_param.name, "*")) { | |
2279 | ||
2280 | int enabled = base_enabler->enabled; | |
2281 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2282 | ||
2283 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2284 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2285 | ||
2286 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2287 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2288 | ||
2289 | } | |
2290 | ||
b01155ba FD |
2291 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2292 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2293 | ||
2294 | /* Link the created event_notifier with its associated enabler. */ | |
2295 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2296 | struct lttng_enabler_ref *enabler_ref; | |
2297 | ||
2298 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2299 | continue; | |
2300 | ||
2301 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2302 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2303 | if (!enabler_ref) { | |
2304 | /* | |
2305 | * If no backward ref, create it. | |
2306 | * Add backward ref from event_notifier to enabler. | |
2307 | */ | |
2308 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2309 | if (!enabler_ref) | |
2310 | return -ENOMEM; | |
2311 | ||
2312 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2313 | event_notifier_enabler); | |
2314 | list_add(&enabler_ref->node, | |
2315 | &event_notifier->enablers_ref_head); | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * Link filter bytecodes if not linked yet. | |
2320 | */ | |
2321 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2322 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2323 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2324 | |
2325 | /* Link capture bytecodes if not linked yet. */ | |
2326 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2327 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2328 | &event_notifier_enabler->capture_bytecode_head); | |
2329 | ||
2330 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2331 | } |
2332 | return 0; | |
2333 | } | |
2334 | ||
3c997079 MD |
2335 | /* |
2336 | * Called at module load: connect the probe on all enablers matching | |
2337 | * this event. | |
2338 | * Called with sessions lock held. | |
2339 | */ | |
2340 | int lttng_fix_pending_events(void) | |
2341 | { | |
2342 | struct lttng_session *session; | |
2343 | ||
2344 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2345 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2346 | return 0; |
2347 | } | |
2348 | ||
b01155ba FD |
2349 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2350 | struct lttng_event_notifier_group *event_notifier_group) | |
2351 | { | |
2352 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2353 | ||
2354 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2355 | node) { | |
2356 | if (event_notifier_enabler->base.enabled) | |
2357 | return true; | |
2358 | } | |
2359 | return false; | |
2360 | } | |
2361 | ||
2362 | bool lttng_event_notifier_active(void) | |
2363 | { | |
2364 | struct lttng_event_notifier_group *event_notifier_group; | |
2365 | ||
2366 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2367 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2368 | return true; | |
2369 | } | |
2370 | return false; | |
2371 | } | |
2372 | ||
2373 | int lttng_fix_pending_event_notifiers(void) | |
2374 | { | |
2375 | struct lttng_event_notifier_group *event_notifier_group; | |
2376 | ||
2377 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2378 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2379 | return 0; | |
2380 | } | |
2381 | ||
b2bc0bc8 FD |
2382 | struct lttng_event_enabler *lttng_event_enabler_create( |
2383 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2384 | struct lttng_kernel_event *event_param, |
2385 | struct lttng_channel *chan) | |
2386 | { | |
b2bc0bc8 | 2387 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2388 | |
b2bc0bc8 FD |
2389 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2390 | if (!event_enabler) | |
3c997079 | 2391 | return NULL; |
b2bc0bc8 FD |
2392 | event_enabler->base.format_type = format_type; |
2393 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2394 | memcpy(&event_enabler->base.event_param, event_param, | |
2395 | sizeof(event_enabler->base.event_param)); | |
2396 | event_enabler->chan = chan; | |
3c997079 | 2397 | /* ctx left NULL */ |
b2bc0bc8 FD |
2398 | event_enabler->base.enabled = 0; |
2399 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2400 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2401 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2402 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2403 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2404 | return event_enabler; |
3c997079 MD |
2405 | } |
2406 | ||
b2bc0bc8 | 2407 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2408 | { |
2409 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2410 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2411 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2412 | mutex_unlock(&sessions_mutex); |
2413 | return 0; | |
2414 | } | |
2415 | ||
b2bc0bc8 | 2416 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2417 | { |
2418 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2419 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2420 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2421 | mutex_unlock(&sessions_mutex); |
2422 | return 0; | |
2423 | } | |
2424 | ||
b2bc0bc8 | 2425 | static |
183e8b3a | 2426 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2427 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2428 | { | |
89ec2b91 | 2429 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2430 | uint32_t bytecode_len; |
2431 | int ret; | |
2432 | ||
2433 | ret = get_user(bytecode_len, &bytecode->len); | |
2434 | if (ret) | |
2435 | return ret; | |
52cfcdf3 | 2436 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2437 | GFP_KERNEL); |
2438 | if (!bytecode_node) | |
2439 | return -ENOMEM; | |
2440 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2441 | sizeof(*bytecode) + bytecode_len); | |
2442 | if (ret) | |
2443 | goto error_free; | |
b2bc0bc8 | 2444 | |
89ec2b91 | 2445 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2446 | bytecode_node->enabler = enabler; |
2447 | /* Enforce length based on allocated size */ | |
2448 | bytecode_node->bc.len = bytecode_len; | |
2449 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2450 | |
07dfc1d0 MD |
2451 | return 0; |
2452 | ||
2453 | error_free: | |
52cfcdf3 | 2454 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2455 | return ret; |
2456 | } | |
2457 | ||
183e8b3a | 2458 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2459 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2460 | { | |
2461 | int ret; | |
183e8b3a | 2462 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2463 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2464 | if (ret) | |
2465 | goto error; | |
2466 | ||
2467 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2468 | return 0; | |
2469 | ||
2470 | error: | |
2471 | return ret; | |
2472 | } | |
2473 | ||
3aed4dca FD |
2474 | int lttng_event_add_callsite(struct lttng_event *event, |
2475 | struct lttng_kernel_event_callsite __user *callsite) | |
2476 | { | |
2477 | ||
2478 | switch (event->instrumentation) { | |
2479 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2480 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2481 | default: |
2482 | return -EINVAL; | |
2483 | } | |
2484 | } | |
2485 | ||
b2bc0bc8 | 2486 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2487 | struct lttng_kernel_context *context_param) |
2488 | { | |
2489 | return -ENOSYS; | |
2490 | } | |
2491 | ||
2492 | static | |
2493 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2494 | { | |
89ec2b91 | 2495 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2496 | |
2497 | /* Destroy filter bytecode */ | |
2498 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2499 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2500 | lttng_kvfree(filter_node); |
07dfc1d0 | 2501 | } |
b2bc0bc8 FD |
2502 | } |
2503 | ||
2504 | static | |
2505 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2506 | { | |
2507 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2508 | |
3c997079 | 2509 | /* Destroy contexts */ |
b2bc0bc8 | 2510 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2511 | |
b2bc0bc8 FD |
2512 | list_del(&event_enabler->node); |
2513 | kfree(event_enabler); | |
3c997079 MD |
2514 | } |
2515 | ||
dffef45d FD |
2516 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2517 | struct lttng_event_notifier_group *event_notifier_group, | |
2518 | enum lttng_enabler_format_type format_type, | |
2519 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2520 | { | |
2521 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2522 | ||
2523 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2524 | if (!event_notifier_enabler) | |
2525 | return NULL; | |
2526 | ||
2527 | event_notifier_enabler->base.format_type = format_type; | |
2528 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2529 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2530 | ||
99f52fcc | 2531 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2532 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2533 | |
8a8ac9a8 FD |
2534 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2535 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2536 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2537 | ||
2538 | event_notifier_enabler->base.enabled = 0; | |
2539 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2540 | event_notifier_enabler->group = event_notifier_group; | |
2541 | ||
2542 | mutex_lock(&sessions_mutex); | |
2543 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2544 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2545 | |
2546 | mutex_unlock(&sessions_mutex); | |
2547 | ||
2548 | return event_notifier_enabler; | |
2549 | } | |
2550 | ||
2551 | int lttng_event_notifier_enabler_enable( | |
2552 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2553 | { | |
2554 | mutex_lock(&sessions_mutex); | |
2555 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2556 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2557 | mutex_unlock(&sessions_mutex); |
2558 | return 0; | |
2559 | } | |
2560 | ||
2561 | int lttng_event_notifier_enabler_disable( | |
2562 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2563 | { | |
2564 | mutex_lock(&sessions_mutex); | |
2565 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2566 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2567 | mutex_unlock(&sessions_mutex); |
2568 | return 0; | |
2569 | } | |
2570 | ||
183e8b3a | 2571 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2572 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2573 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2574 | { | |
2575 | int ret; | |
2576 | ||
183e8b3a | 2577 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2578 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2579 | bytecode); | |
2580 | if (ret) | |
2581 | goto error; | |
2582 | ||
b01155ba | 2583 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2584 | return 0; |
2585 | ||
2586 | error: | |
2587 | return ret; | |
2588 | } | |
2589 | ||
99d223ad FD |
2590 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2591 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2592 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2593 | { | |
2594 | struct lttng_bytecode_node *bytecode_node; | |
2595 | struct lttng_enabler *enabler = | |
2596 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2597 | uint32_t bytecode_len; | |
2598 | int ret; | |
2599 | ||
2600 | ret = get_user(bytecode_len, &bytecode->len); | |
2601 | if (ret) | |
2602 | return ret; | |
2603 | ||
2604 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2605 | GFP_KERNEL); | |
2606 | if (!bytecode_node) | |
2607 | return -ENOMEM; | |
2608 | ||
2609 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2610 | sizeof(*bytecode) + bytecode_len); | |
2611 | if (ret) | |
2612 | goto error_free; | |
2613 | ||
2614 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2615 | bytecode_node->enabler = enabler; | |
2616 | ||
2617 | /* Enforce length based on allocated size */ | |
2618 | bytecode_node->bc.len = bytecode_len; | |
2619 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2620 | ||
2621 | event_notifier_enabler->num_captures++; | |
2622 | ||
2623 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2624 | goto end; | |
2625 | ||
2626 | error_free: | |
2627 | lttng_kvfree(bytecode_node); | |
2628 | end: | |
2629 | return ret; | |
2630 | } | |
2631 | ||
9de67196 FD |
2632 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2633 | struct lttng_kernel_event_callsite __user *callsite) | |
2634 | { | |
2635 | ||
2636 | switch (event_notifier->instrumentation) { | |
2637 | case LTTNG_KERNEL_UPROBE: | |
2638 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2639 | callsite); | |
2640 | default: | |
2641 | return -EINVAL; | |
2642 | } | |
2643 | } | |
2644 | ||
dffef45d FD |
2645 | int lttng_event_notifier_enabler_attach_context( |
2646 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2647 | struct lttng_kernel_context *context_param) | |
2648 | { | |
2649 | return -ENOSYS; | |
2650 | } | |
2651 | ||
2652 | static | |
2653 | void lttng_event_notifier_enabler_destroy( | |
2654 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2655 | { | |
2656 | if (!event_notifier_enabler) { | |
2657 | return; | |
2658 | } | |
2659 | ||
2660 | list_del(&event_notifier_enabler->node); | |
2661 | ||
2662 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2663 | kfree(event_notifier_enabler); | |
2664 | } | |
2665 | ||
3c997079 | 2666 | /* |
b2bc0bc8 | 2667 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2668 | * session. |
2669 | * Should be called with sessions mutex held. | |
2670 | */ | |
2671 | static | |
b2bc0bc8 | 2672 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2673 | { |
b2bc0bc8 | 2674 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2675 | struct lttng_event *event; |
2676 | ||
b2bc0bc8 FD |
2677 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2678 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2679 | /* |
2680 | * For each event, if at least one of its enablers is enabled, | |
2681 | * and its channel and session transient states are enabled, we | |
2682 | * enable the event, else we disable it. | |
2683 | */ | |
2684 | list_for_each_entry(event, &session->events, list) { | |
2685 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2686 | struct lttng_bytecode_runtime *runtime; |
2687 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2688 | |
4ecb5ad5 | 2689 | switch (event->instrumentation) { |
b4a75708 | 2690 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
4ecb5ad5 | 2691 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
2692 | /* Enable events */ |
2693 | list_for_each_entry(enabler_ref, | |
2694 | &event->enablers_ref_head, node) { | |
2695 | if (enabler_ref->ref->enabled) { | |
2696 | enabled = 1; | |
2697 | break; | |
2698 | } | |
2699 | } | |
4ecb5ad5 | 2700 | break; |
b4a75708 | 2701 | |
4ecb5ad5 | 2702 | default: |
3c997079 MD |
2703 | /* Not handled with lazy sync. */ |
2704 | continue; | |
2705 | } | |
2706 | /* | |
2707 | * Enabled state is based on union of enablers, with | |
2708 | * intesection of session and channel transient enable | |
2709 | * states. | |
2710 | */ | |
2711 | enabled = enabled && session->tstate && event->chan->tstate; | |
2712 | ||
a8f2d0c7 | 2713 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2714 | /* |
2715 | * Sync tracepoint registration with event enabled | |
2716 | * state. | |
2717 | */ | |
2718 | if (enabled) { | |
2719 | register_event(event); | |
2720 | } else { | |
2721 | _lttng_event_unregister(event); | |
2722 | } | |
07dfc1d0 MD |
2723 | |
2724 | /* Check if has enablers without bytecode enabled */ | |
2725 | list_for_each_entry(enabler_ref, | |
2726 | &event->enablers_ref_head, node) { | |
2727 | if (enabler_ref->ref->enabled | |
2728 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2729 | has_enablers_without_bytecode = 1; | |
2730 | break; | |
2731 | } | |
2732 | } | |
2733 | event->has_enablers_without_bytecode = | |
2734 | has_enablers_without_bytecode; | |
2735 | ||
2736 | /* Enable filters */ | |
2737 | list_for_each_entry(runtime, | |
183e8b3a | 2738 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2739 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2740 | } |
2741 | } | |
2742 | ||
2743 | /* | |
2744 | * Apply enablers to session events, adding events to session if need | |
2745 | * be. It is required after each modification applied to an active | |
2746 | * session, and right before session "start". | |
2747 | * "lazy" sync means we only sync if required. | |
2748 | * Should be called with sessions mutex held. | |
2749 | */ | |
2750 | static | |
b2bc0bc8 | 2751 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2752 | { |
2753 | /* We can skip if session is not active */ | |
2754 | if (!session->active) | |
2755 | return; | |
b2bc0bc8 | 2756 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2757 | } |
2758 | ||
b01155ba FD |
2759 | static |
2760 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2761 | { | |
2762 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2763 | struct lttng_event_notifier *event_notifier; | |
2764 | ||
2765 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2766 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2767 | ||
2768 | /* | |
2769 | * For each event_notifier, if at least one of its enablers is enabled, | |
2770 | * we enable the event_notifier, else we disable it. | |
2771 | */ | |
2772 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2773 | struct lttng_enabler_ref *enabler_ref; | |
2774 | struct lttng_bytecode_runtime *runtime; | |
2775 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2776 | ||
2777 | switch (event_notifier->instrumentation) { | |
b4a75708 | 2778 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
b01155ba FD |
2779 | case LTTNG_KERNEL_SYSCALL: |
2780 | /* Enable event_notifiers */ | |
2781 | list_for_each_entry(enabler_ref, | |
2782 | &event_notifier->enablers_ref_head, node) { | |
2783 | if (enabler_ref->ref->enabled) { | |
2784 | enabled = 1; | |
2785 | break; | |
2786 | } | |
2787 | } | |
2788 | break; | |
b4a75708 | 2789 | |
b01155ba FD |
2790 | default: |
2791 | /* Not handled with sync. */ | |
2792 | continue; | |
2793 | } | |
2794 | ||
2795 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2796 | /* | |
2797 | * Sync tracepoint registration with event_notifier enabled | |
2798 | * state. | |
2799 | */ | |
2800 | if (enabled) { | |
2801 | if (!event_notifier->registered) | |
2802 | register_event_notifier(event_notifier); | |
2803 | } else { | |
2804 | if (event_notifier->registered) | |
2805 | _lttng_event_notifier_unregister(event_notifier); | |
2806 | } | |
2807 | ||
2808 | /* Check if has enablers without bytecode enabled */ | |
2809 | list_for_each_entry(enabler_ref, | |
2810 | &event_notifier->enablers_ref_head, node) { | |
2811 | if (enabler_ref->ref->enabled | |
2812 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2813 | has_enablers_without_bytecode = 1; | |
2814 | break; | |
2815 | } | |
2816 | } | |
2817 | event_notifier->has_enablers_without_bytecode = | |
2818 | has_enablers_without_bytecode; | |
2819 | ||
2820 | /* Enable filters */ | |
2821 | list_for_each_entry(runtime, | |
183e8b3a | 2822 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2823 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2824 | |
2825 | /* Enable captures */ | |
2826 | list_for_each_entry(runtime, | |
2827 | &event_notifier->capture_bytecode_runtime_head, node) | |
2828 | lttng_bytecode_capture_sync_state(runtime); | |
c3eddb2e MD |
2829 | |
2830 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier->num_captures); | |
b01155ba FD |
2831 | } |
2832 | } | |
2833 | ||
1ec3f75a | 2834 | /* |
d83004aa JD |
2835 | * Serialize at most one packet worth of metadata into a metadata |
2836 | * channel. | |
92d9f5e6 MD |
2837 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2838 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2839 | * allows us to do racy operations such as looking for remaining space left in | |
2840 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2841 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2842 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2843 | * Returns the number of bytes written in the channel, 0 if no data |
2844 | * was written and a negative value on error. | |
1ec3f75a | 2845 | */ |
b3b8072b | 2846 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2847 | struct channel *chan, bool *coherent) |
d83004aa JD |
2848 | { |
2849 | struct lib_ring_buffer_ctx ctx; | |
2850 | int ret = 0; | |
2851 | size_t len, reserve_len; | |
2852 | ||
f613e3e6 | 2853 | /* |
92d9f5e6 MD |
2854 | * Ensure we support mutiple get_next / put sequences followed by |
2855 | * put_next. The metadata cache lock protects reading the metadata | |
2856 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2857 | * "flush" operations on the buffer invoked by different processes. | |
2858 | * Moreover, since the metadata cache memory can be reallocated, we | |
2859 | * need to have exclusive access against updates even though we only | |
2860 | * read it. | |
f613e3e6 | 2861 | */ |
92d9f5e6 | 2862 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2863 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2864 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2865 | goto end; |
f613e3e6 | 2866 | |
9616f0bf JD |
2867 | /* Metadata regenerated, change the version. */ |
2868 | if (stream->metadata_cache->version != stream->version) | |
2869 | stream->version = stream->metadata_cache->version; | |
2870 | ||
d83004aa | 2871 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2872 | stream->metadata_in; |
9de2c215 | 2873 | if (!len) |
de23d59d | 2874 | goto end; |
d83004aa | 2875 | reserve_len = min_t(size_t, |
b3b8072b | 2876 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2877 | len); |
b3b8072b | 2878 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2879 | sizeof(char), -1); |
2880 | /* | |
2881 | * If reservation failed, return an error to the caller. | |
2882 | */ | |
b3b8072b | 2883 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2884 | if (ret != 0) { |
2885 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2886 | stream->coherent = false; |
d83004aa JD |
2887 | goto end; |
2888 | } | |
b3b8072b | 2889 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2890 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2891 | reserve_len); |
b3b8072b | 2892 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2893 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2894 | if (reserve_len < len) |
8b97fd42 MD |
2895 | stream->coherent = false; |
2896 | else | |
2897 | stream->coherent = true; | |
d83004aa JD |
2898 | ret = reserve_len; |
2899 | ||
2900 | end: | |
8b97fd42 MD |
2901 | if (coherent) |
2902 | *coherent = stream->coherent; | |
92d9f5e6 | 2903 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2904 | return ret; |
2905 | } | |
2906 | ||
8b97fd42 MD |
2907 | static |
2908 | void lttng_metadata_begin(struct lttng_session *session) | |
2909 | { | |
3e75e2a7 MD |
2910 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2911 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2912 | } |
2913 | ||
2914 | static | |
2915 | void lttng_metadata_end(struct lttng_session *session) | |
2916 | { | |
3e75e2a7 MD |
2917 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2918 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2919 | struct lttng_metadata_stream *stream; | |
2920 | ||
3e75e2a7 MD |
2921 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2922 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2923 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2924 | } |
8b97fd42 MD |
2925 | } |
2926 | ||
d83004aa JD |
2927 | /* |
2928 | * Write the metadata to the metadata cache. | |
2929 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2930 | * The metadata cache lock protects us from concurrent read access from |
2931 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2932 | * The content of the printf is printed as a single atomic metadata |
2933 | * transaction. | |
d83004aa | 2934 | */ |
a90917c3 | 2935 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2936 | const char *fmt, ...) |
2937 | { | |
c099397a | 2938 | char *str; |
d83004aa | 2939 | size_t len; |
c099397a MD |
2940 | va_list ap; |
2941 | ||
585e5dcc | 2942 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2943 | |
2944 | va_start(ap, fmt); | |
2945 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2946 | va_end(ap); | |
2947 | if (!str) | |
2948 | return -ENOMEM; | |
2949 | ||
1ec3f75a | 2950 | len = strlen(str); |
3e75e2a7 | 2951 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2952 | if (session->metadata_cache->metadata_written + len > |
2953 | session->metadata_cache->cache_alloc) { | |
2954 | char *tmp_cache_realloc; | |
2955 | unsigned int tmp_cache_alloc_size; | |
2956 | ||
2957 | tmp_cache_alloc_size = max_t(unsigned int, | |
2958 | session->metadata_cache->cache_alloc + len, | |
2959 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2960 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2961 | if (!tmp_cache_realloc) |
2962 | goto err; | |
a606b6e8 ML |
2963 | if (session->metadata_cache->data) { |
2964 | memcpy(tmp_cache_realloc, | |
2965 | session->metadata_cache->data, | |
2966 | session->metadata_cache->cache_alloc); | |
2967 | vfree(session->metadata_cache->data); | |
2968 | } | |
2969 | ||
d83004aa JD |
2970 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2971 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2972 | } |
d83004aa JD |
2973 | memcpy(session->metadata_cache->data + |
2974 | session->metadata_cache->metadata_written, | |
2975 | str, len); | |
2976 | session->metadata_cache->metadata_written += len; | |
c099397a | 2977 | kfree(str); |
d83004aa | 2978 | |
d83004aa JD |
2979 | return 0; |
2980 | ||
2981 | err: | |
2982 | kfree(str); | |
2983 | return -ENOMEM; | |
c099397a MD |
2984 | } |
2985 | ||
f513b2bf MD |
2986 | static |
2987 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2988 | { | |
2989 | size_t i; | |
2990 | ||
2991 | for (i = 0; i < nesting; i++) { | |
2992 | int ret; | |
2993 | ||
2994 | ret = lttng_metadata_printf(session, " "); | |
2995 | if (ret) { | |
2996 | return ret; | |
2997 | } | |
2998 | } | |
2999 | return 0; | |
3000 | } | |
3001 | ||
ceabb767 MD |
3002 | static |
3003 | int lttng_field_name_statedump(struct lttng_session *session, | |
3004 | const struct lttng_event_field *field, | |
3005 | size_t nesting) | |
3006 | { | |
3007 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3008 | } | |
3009 | ||
3010 | static | |
3011 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
3012 | const struct lttng_type *type, | |
3013 | size_t nesting) | |
3014 | { | |
3015 | int ret; | |
3016 | ||
12bb2edb | 3017 | WARN_ON_ONCE(type->type != lttng_kernel_type_integer); |
ceabb767 MD |
3018 | ret = print_tabs(session, nesting); |
3019 | if (ret) | |
3020 | return ret; | |
3021 | ret = lttng_metadata_printf(session, | |
3022 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
3023 | type->u.integer.size, | |
3024 | type->u.integer.alignment, | |
3025 | type->u.integer.signedness, | |
28cbcb59 | 3026 | (type->u.integer.encoding == lttng_kernel_string_encoding_none) |
ceabb767 | 3027 | ? "none" |
28cbcb59 | 3028 | : (type->u.integer.encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3029 | ? "UTF8" |
3030 | : "ASCII", | |
3031 | type->u.integer.base, | |
3032 | #if __BYTE_ORDER == __BIG_ENDIAN | |
3033 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
3034 | #else | |
3035 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
3036 | #endif | |
3037 | ); | |
3038 | return ret; | |
3039 | } | |
3040 | ||
f513b2bf MD |
3041 | /* |
3042 | * Must be called with sessions_mutex held. | |
3043 | */ | |
3044 | static | |
3045 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
3046 | const struct lttng_type *type, | |
3047 | size_t nesting) | |
3048 | { | |
3049 | int ret; | |
3050 | uint32_t i, nr_fields; | |
ceabb767 MD |
3051 | unsigned int alignment; |
3052 | ||
12bb2edb | 3053 | WARN_ON_ONCE(type->type != lttng_kernel_type_struct_nestable); |
f513b2bf MD |
3054 | |
3055 | ret = print_tabs(session, nesting); | |
3056 | if (ret) | |
3057 | return ret; | |
3058 | ret = lttng_metadata_printf(session, | |
3059 | "struct {\n"); | |
3060 | if (ret) | |
3061 | return ret; | |
ceabb767 | 3062 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
3063 | for (i = 0; i < nr_fields; i++) { |
3064 | const struct lttng_event_field *iter_field; | |
3065 | ||
ceabb767 | 3066 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
3067 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3068 | if (ret) | |
3069 | return ret; | |
3070 | } | |
3071 | ret = print_tabs(session, nesting); | |
3072 | if (ret) | |
3073 | return ret; | |
ceabb767 MD |
3074 | alignment = type->u.struct_nestable.alignment; |
3075 | if (alignment) { | |
3076 | ret = lttng_metadata_printf(session, | |
3077 | "} align(%u)", | |
3078 | alignment); | |
3079 | } else { | |
3080 | ret = lttng_metadata_printf(session, | |
3081 | "}"); | |
3082 | } | |
f513b2bf MD |
3083 | return ret; |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * Must be called with sessions_mutex held. | |
3088 | */ | |
3089 | static | |
ceabb767 | 3090 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3091 | const struct lttng_event_field *field, |
3092 | size_t nesting) | |
3093 | { | |
3094 | int ret; | |
3095 | ||
3096 | ret = _lttng_struct_type_statedump(session, | |
3097 | &field->type, nesting); | |
3098 | if (ret) | |
3099 | return ret; | |
ceabb767 | 3100 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3101 | } |
3102 | ||
65c85aa6 MD |
3103 | /* |
3104 | * Must be called with sessions_mutex held. | |
3105 | */ | |
3106 | static | |
3107 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
3108 | const struct lttng_type *type, | |
3109 | size_t nesting) | |
3110 | { | |
3111 | int ret; | |
3112 | uint32_t i, nr_choices; | |
3113 | ||
12bb2edb | 3114 | WARN_ON_ONCE(type->type != lttng_kernel_type_variant_nestable); |
ceabb767 MD |
3115 | /* |
3116 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3117 | */ | |
3118 | if (type->u.variant_nestable.alignment != 0) | |
3119 | return -EINVAL; | |
65c85aa6 MD |
3120 | ret = print_tabs(session, nesting); |
3121 | if (ret) | |
3122 | return ret; | |
3123 | ret = lttng_metadata_printf(session, | |
3124 | "variant <_%s> {\n", | |
ceabb767 | 3125 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
3126 | if (ret) |
3127 | return ret; | |
ceabb767 | 3128 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
3129 | for (i = 0; i < nr_choices; i++) { |
3130 | const struct lttng_event_field *iter_field; | |
3131 | ||
ceabb767 | 3132 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
3133 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3134 | if (ret) | |
3135 | return ret; | |
3136 | } | |
3137 | ret = print_tabs(session, nesting); | |
3138 | if (ret) | |
3139 | return ret; | |
3140 | ret = lttng_metadata_printf(session, | |
3141 | "}"); | |
3142 | return ret; | |
3143 | } | |
3144 | ||
3145 | /* | |
3146 | * Must be called with sessions_mutex held. | |
3147 | */ | |
3148 | static | |
ceabb767 | 3149 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3150 | const struct lttng_event_field *field, |
3151 | size_t nesting) | |
3152 | { | |
3153 | int ret; | |
3154 | ||
3155 | ret = _lttng_variant_type_statedump(session, | |
3156 | &field->type, nesting); | |
3157 | if (ret) | |
3158 | return ret; | |
ceabb767 | 3159 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3160 | } |
3161 | ||
f513b2bf MD |
3162 | /* |
3163 | * Must be called with sessions_mutex held. | |
3164 | */ | |
3165 | static | |
ceabb767 | 3166 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3167 | const struct lttng_event_field *field, |
3168 | size_t nesting) | |
3169 | { | |
3170 | int ret; | |
3171 | const struct lttng_type *elem_type; | |
3172 | ||
12bb2edb | 3173 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_array_nestable); |
ceabb767 MD |
3174 | |
3175 | if (field->type.u.array_nestable.alignment) { | |
3176 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3177 | if (ret) |
3178 | return ret; | |
ceabb767 MD |
3179 | ret = lttng_metadata_printf(session, |
3180 | "struct { } align(%u) _%s_padding;\n", | |
3181 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3182 | field->name); | |
3183 | if (ret) | |
3184 | return ret; | |
3185 | } | |
3186 | /* | |
3187 | * Nested compound types: Only array of structures and variants are | |
3188 | * currently supported. | |
3189 | */ | |
3190 | elem_type = field->type.u.array_nestable.elem_type; | |
12bb2edb MD |
3191 | switch (elem_type->type) { |
3192 | case lttng_kernel_type_integer: | |
3193 | case lttng_kernel_type_struct_nestable: | |
3194 | case lttng_kernel_type_variant_nestable: | |
ceabb767 | 3195 | ret = _lttng_type_statedump(session, elem_type, nesting); |
65c85aa6 MD |
3196 | if (ret) |
3197 | return ret; | |
3198 | break; | |
ceabb767 | 3199 | |
f513b2bf MD |
3200 | default: |
3201 | return -EINVAL; | |
3202 | } | |
3203 | ret = lttng_metadata_printf(session, | |
3204 | " _%s[%u];\n", | |
3205 | field->name, | |
ceabb767 | 3206 | field->type.u.array_nestable.length); |
f513b2bf MD |
3207 | return ret; |
3208 | } | |
3209 | ||
3210 | /* | |
3211 | * Must be called with sessions_mutex held. | |
3212 | */ | |
3213 | static | |
ceabb767 | 3214 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3215 | const struct lttng_event_field *field, |
3216 | size_t nesting) | |
3217 | { | |
3218 | int ret; | |
3219 | const char *length_name; | |
3220 | const struct lttng_type *elem_type; | |
3221 | ||
12bb2edb | 3222 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_sequence_nestable); |
f513b2bf | 3223 | |
ceabb767 MD |
3224 | length_name = field->type.u.sequence_nestable.length_name; |
3225 | ||
3226 | if (field->type.u.sequence_nestable.alignment) { | |
3227 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3228 | if (ret) |
3229 | return ret; | |
ceabb767 MD |
3230 | ret = lttng_metadata_printf(session, |
3231 | "struct { } align(%u) _%s_padding;\n", | |
3232 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3233 | field->name); | |
3234 | if (ret) | |
3235 | return ret; | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * Nested compound types: Only array of structures and variants are | |
3240 | * currently supported. | |
3241 | */ | |
3242 | elem_type = field->type.u.sequence_nestable.elem_type; | |
12bb2edb MD |
3243 | switch (elem_type->type) { |
3244 | case lttng_kernel_type_integer: | |
3245 | case lttng_kernel_type_struct_nestable: | |
3246 | case lttng_kernel_type_variant_nestable: | |
ceabb767 | 3247 | ret = _lttng_type_statedump(session, elem_type, nesting); |
65c85aa6 MD |
3248 | if (ret) |
3249 | return ret; | |
3250 | break; | |
ceabb767 | 3251 | |
f513b2bf MD |
3252 | default: |
3253 | return -EINVAL; | |
3254 | } | |
3255 | ret = lttng_metadata_printf(session, | |
3256 | " _%s[ _%s ];\n", | |
3257 | field->name, | |
ceabb767 | 3258 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3259 | return ret; |
3260 | } | |
3261 | ||
141ddf28 MD |
3262 | /* |
3263 | * Must be called with sessions_mutex held. | |
3264 | */ | |
3265 | static | |
ceabb767 MD |
3266 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3267 | const struct lttng_type *type, | |
141ddf28 MD |
3268 | size_t nesting) |
3269 | { | |
3270 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3271 | const struct lttng_type *container_type; |
141ddf28 MD |
3272 | int ret; |
3273 | unsigned int i, nr_entries; | |
3274 | ||
ceabb767 | 3275 | container_type = type->u.enum_nestable.container_type; |
12bb2edb | 3276 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3277 | ret = -EINVAL; |
3278 | goto end; | |
3279 | } | |
3280 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3281 | nr_entries = enum_desc->nr_entries; |
3282 | ||
3283 | ret = print_tabs(session, nesting); | |
3284 | if (ret) | |
3285 | goto end; | |
ceabb767 MD |
3286 | ret = lttng_metadata_printf(session, "enum : "); |
3287 | if (ret) | |
3288 | goto end; | |
3289 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3290 | if (ret) |
ceabb767 MD |
3291 | goto end; |
3292 | ret = lttng_metadata_printf(session, " {\n"); | |
3293 | if (ret) | |
3294 | goto end; | |
141ddf28 MD |
3295 | /* Dump all entries */ |
3296 | for (i = 0; i < nr_entries; i++) { | |
a28cc520 | 3297 | const struct lttng_kernel_enum_entry *entry = &enum_desc->entries[i]; |
141ddf28 MD |
3298 | int j, len; |
3299 | ||
3300 | ret = print_tabs(session, nesting + 1); | |
3301 | if (ret) | |
3302 | goto end; | |
3303 | ret = lttng_metadata_printf(session, | |
3304 | "\""); | |
3305 | if (ret) | |
3306 | goto end; | |
3307 | len = strlen(entry->string); | |
3308 | /* Escape the character '"' */ | |
3309 | for (j = 0; j < len; j++) { | |
3310 | char c = entry->string[j]; | |
3311 | ||
3312 | switch (c) { | |
3313 | case '"': | |
3314 | ret = lttng_metadata_printf(session, | |
3315 | "\\\""); | |
3316 | break; | |
3317 | case '\\': | |
3318 | ret = lttng_metadata_printf(session, | |
3319 | "\\\\"); | |
3320 | break; | |
3321 | default: | |
3322 | ret = lttng_metadata_printf(session, | |
3323 | "%c", c); | |
3324 | break; | |
3325 | } | |
3326 | if (ret) | |
3327 | goto end; | |
3328 | } | |
08ad1061 PP |
3329 | ret = lttng_metadata_printf(session, "\""); |
3330 | if (ret) | |
3331 | goto end; | |
3332 | ||
3333 | if (entry->options.is_auto) { | |
3334 | ret = lttng_metadata_printf(session, ",\n"); | |
3335 | if (ret) | |
3336 | goto end; | |
141ddf28 | 3337 | } else { |
7c559490 MD |
3338 | ret = lttng_metadata_printf(session, |
3339 | " = "); | |
3340 | if (ret) | |
3341 | goto end; | |
3342 | if (entry->start.signedness) | |
141ddf28 | 3343 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3344 | "%lld", (long long) entry->start.value); |
3345 | else | |
3346 | ret = lttng_metadata_printf(session, | |
3347 | "%llu", entry->start.value); | |
3348 | if (ret) | |
3349 | goto end; | |
3350 | if (entry->start.signedness == entry->end.signedness && | |
3351 | entry->start.value | |
3352 | == entry->end.value) { | |
141ddf28 | 3353 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3354 | ",\n"); |
3355 | } else { | |
3356 | if (entry->end.signedness) { | |
3357 | ret = lttng_metadata_printf(session, | |
3358 | " ... %lld,\n", | |
3359 | (long long) entry->end.value); | |
3360 | } else { | |
3361 | ret = lttng_metadata_printf(session, | |
3362 | " ... %llu,\n", | |
3363 | entry->end.value); | |
3364 | } | |
141ddf28 | 3365 | } |
7c559490 MD |
3366 | if (ret) |
3367 | goto end; | |
141ddf28 | 3368 | } |
141ddf28 MD |
3369 | } |
3370 | ret = print_tabs(session, nesting); | |
3371 | if (ret) | |
3372 | goto end; | |
ceabb767 | 3373 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3374 | end: |
3375 | return ret; | |
3376 | } | |
3377 | ||
d83004aa JD |
3378 | /* |
3379 | * Must be called with sessions_mutex held. | |
3380 | */ | |
c099397a | 3381 | static |
ceabb767 MD |
3382 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3383 | const struct lttng_event_field *field, | |
3384 | size_t nesting) | |
3385 | { | |
3386 | int ret; | |
3387 | ||
3388 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3389 | if (ret) | |
3390 | return ret; | |
3391 | return lttng_field_name_statedump(session, field, nesting); | |
3392 | } | |
3393 | ||
3394 | static | |
3395 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3396 | const struct lttng_event_field *field, | |
3397 | size_t nesting) | |
3398 | { | |
3399 | int ret; | |
3400 | ||
3401 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3402 | if (ret) | |
3403 | return ret; | |
3404 | return lttng_field_name_statedump(session, field, nesting); | |
3405 | } | |
3406 | ||
3407 | static | |
3408 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3409 | const struct lttng_type *type, | |
3410 | size_t nesting) | |
3411 | { | |
3412 | int ret; | |
3413 | ||
12bb2edb | 3414 | WARN_ON_ONCE(type->type != lttng_kernel_type_string); |
ceabb767 MD |
3415 | /* Default encoding is UTF8 */ |
3416 | ret = print_tabs(session, nesting); | |
3417 | if (ret) | |
3418 | return ret; | |
3419 | ret = lttng_metadata_printf(session, | |
3420 | "string%s", | |
28cbcb59 | 3421 | type->u.string.encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3422 | " { encoding = ASCII; }" : ""); |
3423 | return ret; | |
3424 | } | |
3425 | ||
3426 | static | |
3427 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3428 | const struct lttng_event_field *field, |
3429 | size_t nesting) | |
ceabb767 MD |
3430 | { |
3431 | int ret; | |
3432 | ||
12bb2edb | 3433 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_string); |
ceabb767 MD |
3434 | ret = _lttng_string_type_statedump(session, &field->type, nesting); |
3435 | if (ret) | |
3436 | return ret; | |
3437 | return lttng_field_name_statedump(session, field, nesting); | |
3438 | } | |
3439 | ||
3440 | /* | |
3441 | * Must be called with sessions_mutex held. | |
3442 | */ | |
3443 | static | |
3444 | int _lttng_type_statedump(struct lttng_session *session, | |
3445 | const struct lttng_type *type, | |
3446 | size_t nesting) | |
c099397a | 3447 | { |
c099397a | 3448 | int ret = 0; |
c099397a | 3449 | |
12bb2edb MD |
3450 | switch (type->type) { |
3451 | case lttng_kernel_type_integer: | |
ceabb767 | 3452 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3453 | break; |
12bb2edb | 3454 | case lttng_kernel_type_enum_nestable: |
ceabb767 | 3455 | ret = _lttng_enum_type_statedump(session, type, nesting); |
8070f5c0 | 3456 | break; |
12bb2edb | 3457 | case lttng_kernel_type_string: |
ceabb767 MD |
3458 | ret = _lttng_string_type_statedump(session, type, nesting); |
3459 | break; | |
12bb2edb | 3460 | case lttng_kernel_type_struct_nestable: |
ceabb767 | 3461 | ret = _lttng_struct_type_statedump(session, type, nesting); |
8070f5c0 | 3462 | break; |
12bb2edb | 3463 | case lttng_kernel_type_variant_nestable: |
ceabb767 MD |
3464 | ret = _lttng_variant_type_statedump(session, type, nesting); |
3465 | break; | |
3466 | ||
3467 | /* Nested arrays and sequences are not supported yet. */ | |
12bb2edb MD |
3468 | case lttng_kernel_type_array_nestable: |
3469 | case lttng_kernel_type_sequence_nestable: | |
ceabb767 MD |
3470 | default: |
3471 | WARN_ON_ONCE(1); | |
3472 | return -EINVAL; | |
8070f5c0 | 3473 | } |
ceabb767 MD |
3474 | return ret; |
3475 | } | |
8070f5c0 | 3476 | |
ceabb767 MD |
3477 | /* |
3478 | * Must be called with sessions_mutex held. | |
3479 | */ | |
3480 | static | |
3481 | int _lttng_field_statedump(struct lttng_session *session, | |
3482 | const struct lttng_event_field *field, | |
3483 | size_t nesting) | |
3484 | { | |
3485 | int ret = 0; | |
27d2368e | 3486 | |
12bb2edb MD |
3487 | switch (field->type.type) { |
3488 | case lttng_kernel_type_integer: | |
ceabb767 MD |
3489 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3490 | break; | |
12bb2edb | 3491 | case lttng_kernel_type_enum_nestable: |
ceabb767 | 3492 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3493 | break; |
12bb2edb | 3494 | case lttng_kernel_type_string: |
ceabb767 | 3495 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3496 | break; |
12bb2edb | 3497 | case lttng_kernel_type_struct_nestable: |
ceabb767 | 3498 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3499 | break; |
12bb2edb | 3500 | case lttng_kernel_type_array_nestable: |
ceabb767 | 3501 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3502 | break; |
12bb2edb | 3503 | case lttng_kernel_type_sequence_nestable: |
ceabb767 | 3504 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3505 | break; |
12bb2edb | 3506 | case lttng_kernel_type_variant_nestable: |
ceabb767 | 3507 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3508 | break; |
f513b2bf | 3509 | |
8070f5c0 MD |
3510 | default: |
3511 | WARN_ON_ONCE(1); | |
3512 | return -EINVAL; | |
3513 | } | |
3514 | return ret; | |
3515 | } | |
3516 | ||
3517 | static | |
a90917c3 | 3518 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3519 | struct lttng_ctx *ctx) |
3520 | { | |
3521 | int ret = 0; | |
3522 | int i; | |
3523 | ||
3524 | if (!ctx) | |
3525 | return 0; | |
3526 | for (i = 0; i < ctx->nr_fields; i++) { | |
3527 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3528 | ||
f513b2bf | 3529 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3530 | if (ret) |
3531 | return ret; | |
3532 | } | |
3533 | return ret; | |
3534 | } | |
3535 | ||
3536 | static | |
a90917c3 MD |
3537 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3538 | struct lttng_event *event) | |
8070f5c0 MD |
3539 | { |
3540 | const struct lttng_event_desc *desc = event->desc; | |
3541 | int ret = 0; | |
3542 | int i; | |
3543 | ||
3544 | for (i = 0; i < desc->nr_fields; i++) { | |
3545 | const struct lttng_event_field *field = &desc->fields[i]; | |
3546 | ||
f513b2bf | 3547 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3548 | if (ret) |
3549 | return ret; | |
c099397a MD |
3550 | } |
3551 | return ret; | |
3552 | } | |
3553 | ||
d83004aa JD |
3554 | /* |
3555 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3556 | * The entire event metadata is printed as a single atomic metadata |
3557 | * transaction. | |
d83004aa | 3558 | */ |
c099397a | 3559 | static |
a90917c3 MD |
3560 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3561 | struct lttng_channel *chan, | |
3562 | struct lttng_event *event) | |
c099397a MD |
3563 | { |
3564 | int ret = 0; | |
3565 | ||
585e5dcc | 3566 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3567 | return 0; |
d83004aa | 3568 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3569 | return 0; |
3570 | ||
8b97fd42 MD |
3571 | lttng_metadata_begin(session); |
3572 | ||
c099397a MD |
3573 | ret = lttng_metadata_printf(session, |
3574 | "event {\n" | |
ae734547 | 3575 | " name = \"%s\";\n" |
c099397a | 3576 | " id = %u;\n" |
b9074a1b | 3577 | " stream_id = %u;\n", |
c099397a MD |
3578 | event->desc->name, |
3579 | event->id, | |
3580 | event->chan->id); | |
3581 | if (ret) | |
3582 | goto end; | |
3583 | ||
b9074a1b MD |
3584 | if (event->ctx) { |
3585 | ret = lttng_metadata_printf(session, | |
3586 | " context := struct {\n"); | |
3587 | if (ret) | |
3588 | goto end; | |
3589 | } | |
a90917c3 | 3590 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3591 | if (ret) |
3592 | goto end; | |
b9074a1b MD |
3593 | if (event->ctx) { |
3594 | ret = lttng_metadata_printf(session, | |
3595 | " };\n"); | |
3596 | if (ret) | |
3597 | goto end; | |
3598 | } | |
8070f5c0 MD |
3599 | |
3600 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3601 | " fields := struct {\n" |
3602 | ); | |
3603 | if (ret) | |
3604 | goto end; | |
3605 | ||
a90917c3 | 3606 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3607 | if (ret) |
3608 | goto end; | |
3609 | ||
3610 | /* | |
3611 | * LTTng space reservation can only reserve multiples of the | |
3612 | * byte size. | |
3613 | */ | |
3614 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3615 | " };\n" |
3616 | "};\n\n"); | |
c099397a MD |
3617 | if (ret) |
3618 | goto end; | |
3619 | ||
c099397a MD |
3620 | event->metadata_dumped = 1; |
3621 | end: | |
8b97fd42 | 3622 | lttng_metadata_end(session); |
c099397a MD |
3623 | return ret; |
3624 | ||
3625 | } | |
3626 | ||
d83004aa JD |
3627 | /* |
3628 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3629 | * The entire channel metadata is printed as a single atomic metadata |
3630 | * transaction. | |
d83004aa | 3631 | */ |
c099397a | 3632 | static |
a90917c3 MD |
3633 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3634 | struct lttng_channel *chan) | |
c099397a MD |
3635 | { |
3636 | int ret = 0; | |
3637 | ||
585e5dcc | 3638 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3639 | return 0; |
d83004aa JD |
3640 | |
3641 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3642 | return 0; |
3643 | ||
8b97fd42 MD |
3644 | lttng_metadata_begin(session); |
3645 | ||
c099397a MD |
3646 | WARN_ON_ONCE(!chan->header_type); |
3647 | ret = lttng_metadata_printf(session, | |
3648 | "stream {\n" | |
3649 | " id = %u;\n" | |
9115fbdc | 3650 | " event.header := %s;\n" |
b9074a1b | 3651 | " packet.context := struct packet_context;\n", |
c099397a MD |
3652 | chan->id, |
3653 | chan->header_type == 1 ? "struct event_header_compact" : | |
3654 | "struct event_header_large"); | |
3655 | if (ret) | |
3656 | goto end; | |
3657 | ||
b9074a1b MD |
3658 | if (chan->ctx) { |
3659 | ret = lttng_metadata_printf(session, | |
3660 | " event.context := struct {\n"); | |
3661 | if (ret) | |
3662 | goto end; | |
3663 | } | |
a90917c3 | 3664 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3665 | if (ret) |
3666 | goto end; | |
b9074a1b MD |
3667 | if (chan->ctx) { |
3668 | ret = lttng_metadata_printf(session, | |
3669 | " };\n"); | |
3670 | if (ret) | |
3671 | goto end; | |
3672 | } | |
8070f5c0 MD |
3673 | |
3674 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3675 | "};\n\n"); |
8070f5c0 | 3676 | |
c099397a MD |
3677 | chan->metadata_dumped = 1; |
3678 | end: | |
8b97fd42 | 3679 | lttng_metadata_end(session); |
c099397a MD |
3680 | return ret; |
3681 | } | |
3682 | ||
d83004aa JD |
3683 | /* |
3684 | * Must be called with sessions_mutex held. | |
3685 | */ | |
9115fbdc | 3686 | static |
a90917c3 | 3687 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3688 | { |
3689 | return lttng_metadata_printf(session, | |
3690 | "struct packet_context {\n" | |
a3ccff4f MD |
3691 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3692 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3693 | " uint64_t content_size;\n" |
3694 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3695 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3696 | " unsigned long events_discarded;\n" |
9115fbdc | 3697 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3698 | "};\n\n" |
9115fbdc MD |
3699 | ); |
3700 | } | |
3701 | ||
3702 | /* | |
3703 | * Compact header: | |
3704 | * id: range: 0 - 30. | |
3705 | * id 31 is reserved to indicate an extended header. | |
3706 | * | |
3707 | * Large header: | |
3708 | * id: range: 0 - 65534. | |
3709 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3710 | * |
3711 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3712 | */ |
3713 | static | |
a90917c3 | 3714 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3715 | { |
3716 | return lttng_metadata_printf(session, | |
3717 | "struct event_header_compact {\n" | |
3718 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3719 | " variant <id> {\n" | |
3720 | " struct {\n" | |
a3ccff4f | 3721 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3722 | " } compact;\n" |
3723 | " struct {\n" | |
3724 | " uint32_t id;\n" | |
a3ccff4f | 3725 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3726 | " } extended;\n" |
3727 | " } v;\n" | |
3728 | "} align(%u);\n" | |
3729 | "\n" | |
3730 | "struct event_header_large {\n" | |
3731 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3732 | " variant <id> {\n" | |
3733 | " struct {\n" | |
a3ccff4f | 3734 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3735 | " } compact;\n" |
3736 | " struct {\n" | |
3737 | " uint32_t id;\n" | |
a3ccff4f | 3738 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3739 | " } extended;\n" |
3740 | " } v;\n" | |
3741 | "} align(%u);\n\n", | |
a90917c3 MD |
3742 | lttng_alignof(uint32_t) * CHAR_BIT, |
3743 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3744 | ); |
3745 | } | |
3746 | ||
a3ccff4f MD |
3747 | /* |
3748 | * Approximation of NTP time of day to clock monotonic correlation, | |
3749 | * taken at start of trace. | |
3750 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3751 | * in future versions. | |
5283350b MD |
3752 | * This function may return a negative offset. It may happen if the |
3753 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3754 | * |
3755 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3756 | * y2038 compliant. | |
a3ccff4f MD |
3757 | */ |
3758 | static | |
8967b2a3 | 3759 | int64_t measure_clock_offset(void) |
a3ccff4f | 3760 | { |
dcb93448 | 3761 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3762 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3763 | int64_t offset; |
a3ccff4f | 3764 | unsigned long flags; |
3636085f MJ |
3765 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3766 | struct timespec64 rts = { 0, 0 }; | |
3767 | #else | |
3768 | struct timespec rts = { 0, 0 }; | |
3769 | #endif | |
a3ccff4f MD |
3770 | |
3771 | /* Disable interrupts to increase correlation precision. */ | |
3772 | local_irq_save(flags); | |
3773 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3774 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3775 | ktime_get_real_ts64(&rts); | |
3776 | #else | |
216b6baa | 3777 | getnstimeofday(&rts); |
3636085f | 3778 | #endif |
a3ccff4f MD |
3779 | monotonic[1] = trace_clock_read64(); |
3780 | local_irq_restore(flags); | |
3781 | ||
dcb93448 | 3782 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3783 | realtime = (uint64_t) rts.tv_sec * tcf; |
3784 | if (tcf == NSEC_PER_SEC) { | |
3785 | realtime += rts.tv_nsec; | |
3786 | } else { | |
3787 | uint64_t n = rts.tv_nsec * tcf; | |
3788 | ||
3789 | do_div(n, NSEC_PER_SEC); | |
3790 | realtime += n; | |
3791 | } | |
dcb93448 | 3792 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3793 | return offset; |
3794 | } | |
3795 | ||
3eb95be4 JR |
3796 | static |
3797 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3798 | { | |
0f3eaad4 | 3799 | int ret = 0; |
3eb95be4 JR |
3800 | size_t i; |
3801 | char cur; | |
3802 | ||
3803 | i = 0; | |
3804 | cur = string[i]; | |
3805 | while (cur != '\0') { | |
3806 | switch (cur) { | |
3807 | case '\n': | |
3808 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3809 | break; | |
3810 | case '\\': | |
3811 | case '"': | |
3812 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3813 | if (ret) | |
3814 | goto error; | |
3815 | /* We still print the current char */ | |
3816 | /* Fallthrough */ | |
3817 | default: | |
3818 | ret = lttng_metadata_printf(session, "%c", cur); | |
3819 | break; | |
3820 | } | |
3821 | ||
3822 | if (ret) | |
3823 | goto error; | |
3824 | ||
3825 | cur = string[++i]; | |
3826 | } | |
3827 | error: | |
3828 | return ret; | |
3829 | } | |
3830 | ||
3831 | static | |
1c88f269 JR |
3832 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3833 | const char *field_value) | |
3eb95be4 JR |
3834 | { |
3835 | int ret; | |
3836 | ||
1c88f269 | 3837 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3838 | if (ret) |
3839 | goto error; | |
3840 | ||
1c88f269 | 3841 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3842 | if (ret) |
3843 | goto error; | |
3844 | ||
3845 | ret = lttng_metadata_printf(session, "\";\n"); | |
3846 | ||
3847 | error: | |
3848 | return ret; | |
3849 | } | |
3850 | ||
c099397a MD |
3851 | /* |
3852 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3853 | * Must be called with sessions_mutex held. |
c099397a MD |
3854 | */ |
3855 | static | |
a90917c3 | 3856 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3857 | { |
30bdb6e4 | 3858 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3859 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3860 | const char *product_uuid; |
a90917c3 MD |
3861 | struct lttng_channel *chan; |
3862 | struct lttng_event *event; | |
c099397a MD |
3863 | int ret = 0; |
3864 | ||
585e5dcc | 3865 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3866 | return 0; |
8b97fd42 MD |
3867 | |
3868 | lttng_metadata_begin(session); | |
3869 | ||
c099397a MD |
3870 | if (session->metadata_dumped) |
3871 | goto skip_session; | |
c099397a | 3872 | |
d793d5e1 | 3873 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3874 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3875 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3876 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3877 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3878 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3879 | |
3880 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3881 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3882 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3883 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3884 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3885 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3886 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3887 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3888 | "\n" |
3889 | "trace {\n" | |
3890 | " major = %u;\n" | |
3891 | " minor = %u;\n" | |
30bdb6e4 | 3892 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3893 | " byte_order = %s;\n" |
3894 | " packet.header := struct {\n" | |
3895 | " uint32_t magic;\n" | |
1ec3f75a | 3896 | " uint8_t uuid[16];\n" |
d793d5e1 | 3897 | " uint32_t stream_id;\n" |
5594698f | 3898 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3899 | " };\n" |
d793d5e1 | 3900 | "};\n\n", |
a90917c3 MD |
3901 | lttng_alignof(uint8_t) * CHAR_BIT, |
3902 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3903 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3904 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3905 | sizeof(unsigned long) * CHAR_BIT, |
3906 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3907 | CTF_SPEC_MAJOR, |
3908 | CTF_SPEC_MINOR, | |
d793d5e1 | 3909 | uuid_s, |
5214fa50 | 3910 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3911 | "be" |
3912 | #else | |
3913 | "le" | |
3914 | #endif | |
3915 | ); | |
3916 | if (ret) | |
3917 | goto end; | |
3918 | ||
99dc9597 MD |
3919 | ret = lttng_metadata_printf(session, |
3920 | "env {\n" | |
a6058143 | 3921 | " hostname = \"%s\";\n" |
c6c9e10f | 3922 | " domain = \"kernel\";\n" |
99dc9597 | 3923 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3924 | " kernel_release = \"%s\";\n" |
3925 | " kernel_version = \"%s\";\n" | |
3926 | " tracer_name = \"lttng-modules\";\n" | |
3927 | " tracer_major = %d;\n" | |
3928 | " tracer_minor = %d;\n" | |
3929 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3930 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3931 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3932 | utsname()->sysname, |
3933 | utsname()->release, | |
c6c9e10f MD |
3934 | utsname()->version, |
3935 | LTTNG_MODULES_MAJOR_VERSION, | |
3936 | LTTNG_MODULES_MINOR_VERSION, | |
3937 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3938 | ); |
3939 | if (ret) | |
3940 | goto end; | |
3941 | ||
1c88f269 JR |
3942 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3943 | if (ret) | |
3944 | goto end; | |
3945 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3946 | session->creation_time); | |
3eb95be4 JR |
3947 | if (ret) |
3948 | goto end; | |
3949 | ||
c88f762e GB |
3950 | /* Add the product UUID to the 'env' section */ |
3951 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3952 | if (product_uuid) { | |
3953 | ret = lttng_metadata_printf(session, | |
3954 | " product_uuid = \"%s\";\n", | |
3955 | product_uuid | |
3956 | ); | |
3957 | if (ret) | |
3958 | goto end; | |
3959 | } | |
3960 | ||
3961 | /* Close the 'env' section */ | |
3eb95be4 JR |
3962 | ret = lttng_metadata_printf(session, "};\n\n"); |
3963 | if (ret) | |
3964 | goto end; | |
3965 | ||
a3ccff4f MD |
3966 | ret = lttng_metadata_printf(session, |
3967 | "clock {\n" | |
2754583e MD |
3968 | " name = \"%s\";\n", |
3969 | trace_clock_name() | |
a82c63f1 MD |
3970 | ); |
3971 | if (ret) | |
3972 | goto end; | |
3973 | ||
3974 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3975 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3976 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3977 | clock_uuid_s |
3978 | ); | |
3979 | if (ret) | |
3980 | goto end; | |
3981 | } | |
3982 | ||
3983 | ret = lttng_metadata_printf(session, | |
2754583e | 3984 | " description = \"%s\";\n" |
a3ccff4f MD |
3985 | " freq = %llu; /* Frequency, in Hz */\n" |
3986 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3987 | " offset = %lld;\n" |
a3ccff4f | 3988 | "};\n\n", |
2754583e | 3989 | trace_clock_description(), |
a3ccff4f | 3990 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3991 | (long long) measure_clock_offset() |
a3ccff4f MD |
3992 | ); |
3993 | if (ret) | |
3994 | goto end; | |
3995 | ||
3996 | ret = lttng_metadata_printf(session, | |
3997 | "typealias integer {\n" | |
3998 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3999 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4000 | "} := uint27_clock_monotonic_t;\n" |
4001 | "\n" | |
4002 | "typealias integer {\n" | |
4003 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4004 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4005 | "} := uint32_clock_monotonic_t;\n" |
4006 | "\n" | |
4007 | "typealias integer {\n" | |
4008 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4009 | " map = clock.%s.value;\n" |
a3ccff4f | 4010 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4011 | trace_clock_name(), |
a3ccff4f | 4012 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4013 | trace_clock_name(), |
4014 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4015 | trace_clock_name() | |
a3ccff4f MD |
4016 | ); |
4017 | if (ret) | |
4018 | goto end; | |
4019 | ||
a90917c3 | 4020 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4021 | if (ret) |
4022 | goto end; | |
4023 | ||
a90917c3 | 4024 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4025 | if (ret) |
4026 | goto end; | |
4027 | ||
c099397a MD |
4028 | skip_session: |
4029 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4030 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4031 | if (ret) |
4032 | goto end; | |
4033 | } | |
4034 | ||
4035 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 4036 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
4037 | if (ret) |
4038 | goto end; | |
4039 | } | |
4040 | session->metadata_dumped = 1; | |
4041 | end: | |
8b97fd42 | 4042 | lttng_metadata_end(session); |
c099397a MD |
4043 | return ret; |
4044 | } | |
4045 | ||
c0e31d2e | 4046 | /** |
a90917c3 | 4047 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4048 | * @transport: transport structure |
4049 | * | |
4050 | * Registers a transport which can be used as output to extract the data out of | |
4051 | * LTTng. The module calling this registration function must ensure that no | |
4052 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4053 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4054 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4055 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4056 | * after its registration must it synchronize the TLBs. |
4057 | */ | |
a90917c3 | 4058 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4059 | { |
4060 | /* | |
4061 | * Make sure no page fault can be triggered by the module about to be | |
4062 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4063 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4064 | */ |
263b6c88 | 4065 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4066 | |
4067 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4068 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4069 | mutex_unlock(&sessions_mutex); |
4070 | } | |
a90917c3 | 4071 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4072 | |
4073 | /** | |
a90917c3 | 4074 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4075 | * @transport: transport structure |
4076 | */ | |
a90917c3 | 4077 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4078 | { |
4079 | mutex_lock(&sessions_mutex); | |
4080 | list_del(&transport->node); | |
4081 | mutex_unlock(&sessions_mutex); | |
4082 | } | |
a90917c3 | 4083 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4084 | |
a101fa10 MD |
4085 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4086 | { | |
4087 | /* | |
4088 | * Make sure no page fault can be triggered by the module about to be | |
4089 | * registered. We deal with this here so we don't have to call | |
4090 | * vmalloc_sync_mappings() in each module's init. | |
4091 | */ | |
4092 | wrapper_vmalloc_sync_mappings(); | |
4093 | ||
4094 | mutex_lock(&sessions_mutex); | |
4095 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4096 | mutex_unlock(&sessions_mutex); | |
4097 | } | |
4098 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4099 | ||
4100 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4101 | { | |
4102 | mutex_lock(&sessions_mutex); | |
4103 | list_del(&transport->node); | |
4104 | mutex_unlock(&sessions_mutex); | |
4105 | } | |
4106 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4107 | ||
5f4c791e | 4108 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4109 | |
4110 | enum cpuhp_state lttng_hp_prepare; | |
4111 | enum cpuhp_state lttng_hp_online; | |
4112 | ||
4113 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4114 | { | |
4115 | struct lttng_cpuhp_node *lttng_node; | |
4116 | ||
4117 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4118 | switch (lttng_node->component) { | |
4119 | case LTTNG_RING_BUFFER_FRONTEND: | |
4120 | return 0; | |
4121 | case LTTNG_RING_BUFFER_BACKEND: | |
4122 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4123 | case LTTNG_RING_BUFFER_ITER: | |
4124 | return 0; | |
4125 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4126 | return 0; | |
4127 | default: | |
4128 | return -EINVAL; | |
4129 | } | |
4130 | } | |
4131 | ||
4132 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4133 | { | |
4134 | struct lttng_cpuhp_node *lttng_node; | |
4135 | ||
4136 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4137 | switch (lttng_node->component) { | |
4138 | case LTTNG_RING_BUFFER_FRONTEND: | |
4139 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4140 | case LTTNG_RING_BUFFER_BACKEND: | |
4141 | return 0; | |
4142 | case LTTNG_RING_BUFFER_ITER: | |
4143 | return 0; | |
4144 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4145 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4146 | default: | |
4147 | return -EINVAL; | |
4148 | } | |
4149 | } | |
4150 | ||
4151 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4152 | { | |
4153 | struct lttng_cpuhp_node *lttng_node; | |
4154 | ||
4155 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4156 | switch (lttng_node->component) { | |
4157 | case LTTNG_RING_BUFFER_FRONTEND: | |
4158 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4159 | case LTTNG_RING_BUFFER_BACKEND: | |
4160 | return 0; | |
4161 | case LTTNG_RING_BUFFER_ITER: | |
4162 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4163 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4164 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4165 | default: | |
4166 | return -EINVAL; | |
4167 | } | |
4168 | } | |
4169 | ||
4170 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4171 | { | |
4172 | struct lttng_cpuhp_node *lttng_node; | |
4173 | ||
4174 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4175 | switch (lttng_node->component) { | |
4176 | case LTTNG_RING_BUFFER_FRONTEND: | |
4177 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4178 | case LTTNG_RING_BUFFER_BACKEND: | |
4179 | return 0; | |
4180 | case LTTNG_RING_BUFFER_ITER: | |
4181 | return 0; | |
4182 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4183 | return 0; | |
4184 | default: | |
4185 | return -EINVAL; | |
4186 | } | |
4187 | } | |
4188 | ||
4189 | static int __init lttng_init_cpu_hotplug(void) | |
4190 | { | |
4191 | int ret; | |
4192 | ||
4193 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4194 | lttng_hotplug_prepare, | |
4195 | lttng_hotplug_dead); | |
4196 | if (ret < 0) { | |
4197 | return ret; | |
4198 | } | |
4199 | lttng_hp_prepare = ret; | |
4200 | lttng_rb_set_hp_prepare(ret); | |
4201 | ||
4202 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4203 | lttng_hotplug_online, | |
4204 | lttng_hotplug_offline); | |
4205 | if (ret < 0) { | |
4206 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4207 | lttng_hp_prepare = 0; | |
4208 | return ret; | |
4209 | } | |
4210 | lttng_hp_online = ret; | |
4211 | lttng_rb_set_hp_online(ret); | |
4212 | ||
4213 | return 0; | |
4214 | } | |
4215 | ||
4216 | static void __exit lttng_exit_cpu_hotplug(void) | |
4217 | { | |
4218 | lttng_rb_set_hp_online(0); | |
4219 | cpuhp_remove_multi_state(lttng_hp_online); | |
4220 | lttng_rb_set_hp_prepare(0); | |
4221 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4222 | } | |
4223 | ||
5f4c791e | 4224 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4225 | static int lttng_init_cpu_hotplug(void) |
4226 | { | |
4227 | return 0; | |
4228 | } | |
4229 | static void lttng_exit_cpu_hotplug(void) | |
4230 | { | |
4231 | } | |
5f4c791e | 4232 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4233 | |
4234 | ||
a90917c3 | 4235 | static int __init lttng_events_init(void) |
4e3c1b9b | 4236 | { |
1c25284c MD |
4237 | int ret; |
4238 | ||
453b2495 JD |
4239 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4240 | if (ret) | |
4241 | return ret; | |
389d7070 | 4242 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4243 | if (ret) |
4244 | return ret; | |
4245 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4246 | if (ret) |
4247 | return ret; | |
4248 | ret = lttng_probes_init(); | |
389d7070 MD |
4249 | if (ret) |
4250 | return ret; | |
07dfc1d0 | 4251 | ret = lttng_context_init(); |
20591cf7 MD |
4252 | if (ret) |
4253 | return ret; | |
07dfc1d0 MD |
4254 | ret = lttng_tracepoint_init(); |
4255 | if (ret) | |
4256 | goto error_tp; | |
a90917c3 | 4257 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4258 | if (!event_cache) { |
4259 | ret = -ENOMEM; | |
dffef45d FD |
4260 | goto error_kmem_event; |
4261 | } | |
4262 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4263 | if (!event_notifier_cache) { | |
4264 | ret = -ENOMEM; | |
4265 | goto error_kmem_event_notifier; | |
20591cf7 | 4266 | } |
80996790 | 4267 | ret = lttng_abi_init(); |
02119ee5 MD |
4268 | if (ret) |
4269 | goto error_abi; | |
0c956676 MD |
4270 | ret = lttng_logger_init(); |
4271 | if (ret) | |
4272 | goto error_logger; | |
1e367326 MD |
4273 | ret = lttng_init_cpu_hotplug(); |
4274 | if (ret) | |
4275 | goto error_hotplug; | |
101215b7 | 4276 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4277 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4278 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4279 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4280 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4281 | LTTNG_VERSION_NAME, |
4282 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4283 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4284 | #else | |
4285 | "", | |
4286 | #endif | |
4287 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4288 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4289 | #else | |
4290 | ""); | |
4291 | #endif | |
4e3c1b9b | 4292 | return 0; |
0c956676 | 4293 | |
1e367326 MD |
4294 | error_hotplug: |
4295 | lttng_logger_exit(); | |
0c956676 MD |
4296 | error_logger: |
4297 | lttng_abi_exit(); | |
02119ee5 | 4298 | error_abi: |
dffef45d FD |
4299 | kmem_cache_destroy(event_notifier_cache); |
4300 | error_kmem_event_notifier: | |
1c25284c | 4301 | kmem_cache_destroy(event_cache); |
dffef45d | 4302 | error_kmem_event: |
20591cf7 | 4303 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4304 | error_tp: |
4305 | lttng_context_exit(); | |
101215b7 | 4306 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4307 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4308 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4309 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4310 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4311 | LTTNG_VERSION_NAME, |
4312 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4313 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4314 | #else | |
4315 | "", | |
4316 | #endif | |
4317 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4318 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4319 | #else | |
4320 | ""); | |
4321 | #endif | |
1c25284c | 4322 | return ret; |
4e3c1b9b MD |
4323 | } |
4324 | ||
a90917c3 | 4325 | module_init(lttng_events_init); |
11b5a3c2 | 4326 | |
a90917c3 | 4327 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4328 | { |
a90917c3 | 4329 | struct lttng_session *session, *tmpsession; |
92e94819 | 4330 | |
1e367326 | 4331 | lttng_exit_cpu_hotplug(); |
0c956676 | 4332 | lttng_logger_exit(); |
80996790 | 4333 | lttng_abi_exit(); |
92e94819 | 4334 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4335 | lttng_session_destroy(session); |
11b5a3c2 | 4336 | kmem_cache_destroy(event_cache); |
dffef45d | 4337 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4338 | lttng_tracepoint_exit(); |
07dfc1d0 | 4339 | lttng_context_exit(); |
101215b7 | 4340 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4341 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4342 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4343 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4344 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4345 | LTTNG_VERSION_NAME, |
4346 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4347 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4348 | #else | |
4349 | "", | |
4350 | #endif | |
4351 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4352 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4353 | #else | |
4354 | ""); | |
4355 | #endif | |
4e3c1b9b | 4356 | } |
92e94819 | 4357 | |
a90917c3 | 4358 | module_exit(lttng_events_exit); |
11b5a3c2 | 4359 | |
7ca11e77 | 4360 | #include <generated/patches.h> |
101215b7 MJ |
4361 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4362 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4363 | #endif | |
4364 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4365 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4366 | #endif | |
92e94819 MD |
4367 | MODULE_LICENSE("GPL and additional rights"); |
4368 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4369 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4370 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4371 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4372 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4373 | LTTNG_MODULES_EXTRAVERSION); |