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 | 60 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
61 | static struct kmem_cache *event_recorder_cache; |
62 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 63 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 64 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 65 | |
b2bc0bc8 FD |
66 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
67 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
68 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 69 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 70 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
a90917c3 | 73 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
a67ba386 MD |
74 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
75 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 76 | static |
a90917c3 MD |
77 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
78 | struct lttng_channel *chan, | |
a67ba386 | 79 | struct lttng_kernel_event_recorder *event); |
c099397a | 80 | static |
a90917c3 | 81 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
ceabb767 | 85 | int _lttng_type_statedump(struct lttng_session *session, |
437d5aa5 MD |
86 | const struct lttng_kernel_type_common *type, |
87 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
88 | size_t nesting); |
89 | static | |
f513b2bf | 90 | int _lttng_field_statedump(struct lttng_session *session, |
437d5aa5 | 91 | const struct lttng_kernel_event_field *field, |
f513b2bf | 92 | size_t nesting); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
5f4c791e | 96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
97 | synchronize_rcu(); |
98 | #else | |
abcca994 | 99 | synchronize_sched(); |
92da05ce MJ |
100 | #endif |
101 | ||
5f4c791e | 102 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
103 | #ifdef CONFIG_PREEMPT_RT_FULL |
104 | synchronize_rcu(); | |
105 | #endif | |
5f4c791e | 106 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | #ifdef CONFIG_PREEMPT_RT |
108 | synchronize_rcu(); | |
109 | #endif | |
5f4c791e | 110 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
111 | } |
112 | ||
3c997079 MD |
113 | void lttng_lock_sessions(void) |
114 | { | |
115 | mutex_lock(&sessions_mutex); | |
116 | } | |
117 | ||
118 | void lttng_unlock_sessions(void) | |
119 | { | |
120 | mutex_unlock(&sessions_mutex); | |
121 | } | |
122 | ||
9fe593d2 FD |
123 | static struct lttng_transport *lttng_transport_find(const char *name) |
124 | { | |
125 | struct lttng_transport *transport; | |
126 | ||
127 | list_for_each_entry(transport, <tng_transport_list, node) { | |
128 | if (!strcmp(transport->name, name)) | |
129 | return transport; | |
130 | } | |
131 | return NULL; | |
132 | } | |
133 | ||
3c997079 MD |
134 | /* |
135 | * Called with sessions lock held. | |
136 | */ | |
137 | int lttng_session_active(void) | |
138 | { | |
139 | struct lttng_session *iter; | |
140 | ||
141 | list_for_each_entry(iter, &sessions, list) { | |
142 | if (iter->active) | |
143 | return 1; | |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
a90917c3 | 148 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 149 | { |
a90917c3 | 150 | struct lttng_session *session; |
d83004aa | 151 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 152 | int i; |
4e3c1b9b MD |
153 | |
154 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 155 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 156 | if (!session) |
d83004aa | 157 | goto err; |
4e3c1b9b | 158 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 159 | INIT_LIST_HEAD(&session->events); |
a7008254 | 160 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
161 | |
162 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
163 | GFP_KERNEL); | |
164 | if (!metadata_cache) | |
165 | goto err_free_session; | |
0ca42eb7 | 166 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
167 | if (!metadata_cache->data) |
168 | goto err_free_cache; | |
169 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
170 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 171 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
172 | session->metadata_cache = metadata_cache; |
173 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
174 | memcpy(&metadata_cache->uuid, &session->uuid, |
175 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
176 | INIT_LIST_HEAD(&session->enablers_head); |
177 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
178 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 179 | list_add(&session->list, &sessions); |
d1f652f8 MD |
180 | session->pid_tracker.session = session; |
181 | session->pid_tracker.tracker_type = TRACKER_PID; | |
182 | session->vpid_tracker.session = session; | |
183 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
184 | session->uid_tracker.session = session; | |
185 | session->uid_tracker.tracker_type = TRACKER_UID; | |
186 | session->vuid_tracker.session = session; | |
187 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
188 | session->gid_tracker.session = session; | |
189 | session->gid_tracker.tracker_type = TRACKER_GID; | |
190 | session->vgid_tracker.session = session; | |
191 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
192 | mutex_unlock(&sessions_mutex); |
193 | return session; | |
d83004aa JD |
194 | |
195 | err_free_cache: | |
196 | kfree(metadata_cache); | |
197 | err_free_session: | |
48f5e0b5 | 198 | lttng_kvfree(session); |
d83004aa JD |
199 | err: |
200 | mutex_unlock(&sessions_mutex); | |
201 | return NULL; | |
202 | } | |
203 | ||
99f52fcc FD |
204 | static |
205 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
206 | { | |
207 | struct lttng_counter_transport *transport; | |
208 | ||
209 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
210 | if (!strcmp(transport->name, name)) | |
211 | return transport; | |
212 | } | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | struct lttng_counter *lttng_kernel_counter_create( | |
217 | const char *counter_transport_name, | |
218 | size_t number_dimensions, const size_t *dimensions_sizes) | |
219 | { | |
220 | struct lttng_counter *counter = NULL; | |
221 | struct lttng_counter_transport *counter_transport = NULL; | |
222 | ||
223 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
224 | if (!counter_transport) { | |
225 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
226 | counter_transport_name); | |
227 | goto notransport; | |
228 | } | |
229 | if (!try_module_get(counter_transport->owner)) { | |
230 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
231 | goto notransport; | |
232 | } | |
233 | ||
234 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
235 | if (!counter) | |
236 | goto nomem; | |
237 | ||
238 | /* Create event notifier error counter. */ | |
239 | counter->ops = &counter_transport->ops; | |
240 | counter->transport = counter_transport; | |
241 | ||
242 | counter->counter = counter->ops->counter_create( | |
243 | number_dimensions, dimensions_sizes, 0); | |
244 | if (!counter->counter) { | |
245 | goto create_error; | |
246 | } | |
247 | ||
248 | return counter; | |
249 | ||
250 | create_error: | |
251 | lttng_kvfree(counter); | |
252 | nomem: | |
253 | if (counter_transport) | |
254 | module_put(counter_transport->owner); | |
255 | notransport: | |
256 | return NULL; | |
257 | } | |
258 | ||
750b05f2 FD |
259 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
260 | { | |
261 | struct lttng_transport *transport = NULL; | |
262 | struct lttng_event_notifier_group *event_notifier_group; | |
263 | const char *transport_name = "relay-event-notifier"; | |
264 | size_t subbuf_size = 4096; //TODO | |
265 | size_t num_subbuf = 16; //TODO | |
266 | unsigned int switch_timer_interval = 0; | |
267 | unsigned int read_timer_interval = 0; | |
dffef45d | 268 | int i; |
750b05f2 FD |
269 | |
270 | mutex_lock(&sessions_mutex); | |
271 | ||
272 | transport = lttng_transport_find(transport_name); | |
273 | if (!transport) { | |
274 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
275 | transport_name); | |
276 | goto notransport; | |
277 | } | |
278 | if (!try_module_get(transport->owner)) { | |
279 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
280 | transport_name); | |
281 | goto notransport; | |
282 | } | |
283 | ||
284 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
285 | GFP_KERNEL); | |
286 | if (!event_notifier_group) | |
287 | goto nomem; | |
288 | ||
289 | /* | |
290 | * Initialize the ring buffer used to store event notifier | |
291 | * notifications. | |
292 | */ | |
293 | event_notifier_group->ops = &transport->ops; | |
294 | event_notifier_group->chan = transport->ops.channel_create( | |
295 | transport_name, event_notifier_group, NULL, | |
296 | subbuf_size, num_subbuf, switch_timer_interval, | |
297 | read_timer_interval); | |
298 | if (!event_notifier_group->chan) | |
299 | goto create_error; | |
300 | ||
301 | event_notifier_group->transport = transport; | |
dffef45d FD |
302 | |
303 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
304 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
305 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
306 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
307 | ||
750b05f2 FD |
308 | list_add(&event_notifier_group->node, &event_notifier_groups); |
309 | ||
310 | mutex_unlock(&sessions_mutex); | |
311 | ||
312 | return event_notifier_group; | |
313 | ||
314 | create_error: | |
315 | lttng_kvfree(event_notifier_group); | |
316 | nomem: | |
317 | if (transport) | |
318 | module_put(transport->owner); | |
319 | notransport: | |
320 | mutex_unlock(&sessions_mutex); | |
321 | return NULL; | |
322 | } | |
323 | ||
d83004aa JD |
324 | void metadata_cache_destroy(struct kref *kref) |
325 | { | |
326 | struct lttng_metadata_cache *cache = | |
327 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 328 | vfree(cache->data); |
d83004aa | 329 | kfree(cache); |
4e3c1b9b MD |
330 | } |
331 | ||
a90917c3 | 332 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 333 | { |
a90917c3 | 334 | struct lttng_channel *chan, *tmpchan; |
a67ba386 | 335 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 336 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 337 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 338 | int ret; |
4e3c1b9b MD |
339 | |
340 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 341 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 342 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 343 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
344 | WARN_ON(ret); |
345 | } | |
a67ba386 MD |
346 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
347 | ret = _lttng_event_unregister(event_recorder_priv->pub); | |
dda6a249 MD |
348 | WARN_ON(ret); |
349 | } | |
abcca994 | 350 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 351 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 352 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
353 | WARN_ON(ret); |
354 | } | |
b2bc0bc8 | 355 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 356 | &session->enablers_head, node) |
b2bc0bc8 | 357 | lttng_event_enabler_destroy(event_enabler); |
a67ba386 | 358 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->events, node) |
0648898e | 359 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
d83004aa JD |
360 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
361 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 362 | _lttng_channel_destroy(chan); |
d83004aa | 363 | } |
ab036a63 | 364 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
365 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
366 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 367 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
368 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
369 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
371 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
372 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
373 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 374 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
375 | list_del(&session->list); |
376 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 377 | lttng_kvfree(session); |
4e3c1b9b MD |
378 | } |
379 | ||
dffef45d FD |
380 | void lttng_event_notifier_group_destroy( |
381 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 382 | { |
dffef45d | 383 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 384 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
385 | int ret; |
386 | ||
750b05f2 FD |
387 | if (!event_notifier_group) |
388 | return; | |
389 | ||
390 | mutex_lock(&sessions_mutex); | |
dffef45d | 391 | |
3b82c4e1 | 392 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
393 | WARN_ON(ret); |
394 | ||
a67ba386 MD |
395 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
396 | &event_notifier_group->event_notifiers_head, node) { | |
397 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
398 | WARN_ON(ret); |
399 | } | |
400 | ||
b01155ba FD |
401 | /* Wait for in-flight event notifier to complete */ |
402 | synchronize_trace(); | |
403 | ||
21f58fb7 FD |
404 | irq_work_sync(&event_notifier_group->wakeup_pending); |
405 | ||
8a8ac9a8 FD |
406 | kfree(event_notifier_group->sc_filter); |
407 | ||
dffef45d FD |
408 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
409 | &event_notifier_group->enablers_head, node) | |
410 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
411 | ||
a67ba386 MD |
412 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
413 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 414 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 415 | |
99f52fcc FD |
416 | if (event_notifier_group->error_counter) { |
417 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 418 | |
99f52fcc FD |
419 | error_counter->ops->counter_destroy(error_counter->counter); |
420 | module_put(error_counter->transport->owner); | |
421 | lttng_kvfree(error_counter); | |
422 | event_notifier_group->error_counter = NULL; | |
423 | } | |
424 | ||
750b05f2 FD |
425 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
426 | module_put(event_notifier_group->transport->owner); | |
427 | list_del(&event_notifier_group->node); | |
dffef45d | 428 | |
750b05f2 FD |
429 | mutex_unlock(&sessions_mutex); |
430 | lttng_kvfree(event_notifier_group); | |
431 | } | |
432 | ||
601252cf MD |
433 | int lttng_session_statedump(struct lttng_session *session) |
434 | { | |
435 | int ret; | |
436 | ||
437 | mutex_lock(&sessions_mutex); | |
438 | ret = lttng_statedump_start(session); | |
439 | mutex_unlock(&sessions_mutex); | |
440 | return ret; | |
441 | } | |
442 | ||
a90917c3 | 443 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
444 | { |
445 | int ret = 0; | |
a90917c3 | 446 | struct lttng_channel *chan; |
c0e31d2e MD |
447 | |
448 | mutex_lock(&sessions_mutex); | |
449 | if (session->active) { | |
450 | ret = -EBUSY; | |
451 | goto end; | |
452 | } | |
c099397a | 453 | |
3c997079 MD |
454 | /* Set transient enabler state to "enabled" */ |
455 | session->tstate = 1; | |
456 | ||
4ef81e4a | 457 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 458 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 459 | |
c099397a MD |
460 | /* |
461 | * Snapshot the number of events per channel to know the type of header | |
462 | * we need to use. | |
463 | */ | |
464 | list_for_each_entry(chan, &session->chan, list) { | |
465 | if (chan->header_type) | |
466 | continue; /* don't change it if session stop/restart */ | |
467 | if (chan->free_event_id < 31) | |
468 | chan->header_type = 1; /* compact */ | |
469 | else | |
470 | chan->header_type = 2; /* large */ | |
471 | } | |
472 | ||
64af2437 | 473 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
474 | list_for_each_entry(chan, &session->chan, list) { |
475 | if (chan->channel_type != METADATA_CHANNEL) | |
476 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
477 | } | |
64af2437 | 478 | |
a8f2d0c7 MJ |
479 | WRITE_ONCE(session->active, 1); |
480 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 481 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 482 | if (ret) { |
a8f2d0c7 | 483 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
484 | goto end; |
485 | } | |
486 | ret = lttng_statedump_start(session); | |
360f38ea | 487 | if (ret) |
a8f2d0c7 | 488 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
489 | end: |
490 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 491 | return ret; |
c0e31d2e MD |
492 | } |
493 | ||
a90917c3 | 494 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
495 | { |
496 | int ret = 0; | |
64af2437 | 497 | struct lttng_channel *chan; |
c0e31d2e MD |
498 | |
499 | mutex_lock(&sessions_mutex); | |
500 | if (!session->active) { | |
501 | ret = -EBUSY; | |
502 | goto end; | |
503 | } | |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
505 | |
506 | /* Set transient enabler state to "disabled" */ | |
507 | session->tstate = 0; | |
b2bc0bc8 | 508 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
509 | |
510 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
511 | list_for_each_entry(chan, &session->chan, list) { |
512 | if (chan->channel_type != METADATA_CHANNEL) | |
513 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
514 | } | |
c0e31d2e MD |
515 | end: |
516 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 517 | return ret; |
c0e31d2e MD |
518 | } |
519 | ||
9616f0bf JD |
520 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
521 | { | |
522 | int ret = 0; | |
523 | struct lttng_channel *chan; | |
a67ba386 | 524 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
9616f0bf JD |
525 | struct lttng_metadata_cache *cache = session->metadata_cache; |
526 | struct lttng_metadata_stream *stream; | |
527 | ||
528 | mutex_lock(&sessions_mutex); | |
529 | if (!session->active) { | |
530 | ret = -EBUSY; | |
531 | goto end; | |
532 | } | |
533 | ||
534 | mutex_lock(&cache->lock); | |
535 | memset(cache->data, 0, cache->cache_alloc); | |
536 | cache->metadata_written = 0; | |
537 | cache->version++; | |
538 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
539 | stream->metadata_out = 0; | |
540 | stream->metadata_in = 0; | |
541 | } | |
542 | mutex_unlock(&cache->lock); | |
543 | ||
544 | session->metadata_dumped = 0; | |
545 | list_for_each_entry(chan, &session->chan, list) { | |
546 | chan->metadata_dumped = 0; | |
547 | } | |
548 | ||
a67ba386 MD |
549 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
550 | event_recorder_priv->metadata_dumped = 0; | |
9616f0bf JD |
551 | } |
552 | ||
553 | ret = _lttng_session_metadata_statedump(session); | |
554 | ||
555 | end: | |
556 | mutex_unlock(&sessions_mutex); | |
557 | return ret; | |
558 | } | |
559 | ||
a90917c3 | 560 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 561 | { |
3c997079 | 562 | int ret = 0; |
e64957da | 563 | |
3c997079 MD |
564 | mutex_lock(&sessions_mutex); |
565 | if (channel->channel_type == METADATA_CHANNEL) { | |
566 | ret = -EPERM; | |
567 | goto end; | |
568 | } | |
569 | if (channel->enabled) { | |
570 | ret = -EEXIST; | |
571 | goto end; | |
572 | } | |
573 | /* Set transient enabler state to "enabled" */ | |
574 | channel->tstate = 1; | |
b2bc0bc8 | 575 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 576 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 577 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
578 | end: |
579 | mutex_unlock(&sessions_mutex); | |
580 | return ret; | |
e64957da MD |
581 | } |
582 | ||
a90917c3 | 583 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 584 | { |
3c997079 | 585 | int ret = 0; |
e64957da | 586 | |
3c997079 MD |
587 | mutex_lock(&sessions_mutex); |
588 | if (channel->channel_type == METADATA_CHANNEL) { | |
589 | ret = -EPERM; | |
590 | goto end; | |
591 | } | |
592 | if (!channel->enabled) { | |
593 | ret = -EEXIST; | |
594 | goto end; | |
595 | } | |
596 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 597 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
598 | /* Set transient enabler state to "enabled" */ |
599 | channel->tstate = 0; | |
b2bc0bc8 | 600 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
601 | end: |
602 | mutex_unlock(&sessions_mutex); | |
603 | return ret; | |
e64957da MD |
604 | } |
605 | ||
9d993668 | 606 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 607 | { |
3c997079 | 608 | int ret = 0; |
e64957da | 609 | |
3c997079 | 610 | mutex_lock(&sessions_mutex); |
9d993668 MD |
611 | switch (event->type) { |
612 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
613 | { | |
614 | struct lttng_kernel_event_recorder *event_recorder = | |
615 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
616 | ||
617 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
618 | ret = -EPERM; | |
619 | goto end; | |
620 | } | |
a0493bef | 621 | break; |
9d993668 MD |
622 | } |
623 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
624 | switch (event->priv->instrumentation) { | |
625 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
626 | ret = -EINVAL; | |
627 | goto end; | |
628 | default: | |
629 | break; | |
630 | } | |
a0493bef MD |
631 | break; |
632 | default: | |
9d993668 | 633 | break; |
a0493bef | 634 | } |
e64957da | 635 | |
9d993668 | 636 | if (event->enabled) { |
3c997079 MD |
637 | ret = -EEXIST; |
638 | goto end; | |
639 | } | |
a67ba386 | 640 | switch (event->priv->instrumentation) { |
606828e4 MD |
641 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
642 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
643 | ret = -EINVAL; |
644 | break; | |
b4a75708 | 645 | |
606828e4 MD |
646 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
647 | case LTTNG_KERNEL_ABI_UPROBE: | |
9d993668 | 648 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 649 | break; |
b4a75708 | 650 | |
606828e4 | 651 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 652 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 653 | break; |
b4a75708 | 654 | |
606828e4 MD |
655 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
656 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
657 | default: |
658 | WARN_ON_ONCE(1); | |
659 | ret = -EINVAL; | |
660 | } | |
3c997079 MD |
661 | end: |
662 | mutex_unlock(&sessions_mutex); | |
663 | return ret; | |
e64957da MD |
664 | } |
665 | ||
9d993668 | 666 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
667 | { |
668 | int ret = 0; | |
669 | ||
670 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
671 | switch (event->type) { |
672 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
673 | { | |
674 | struct lttng_kernel_event_recorder *event_recorder = | |
675 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
676 | ||
677 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
678 | ret = -EPERM; | |
679 | goto end; | |
680 | } | |
b01155ba | 681 | break; |
9d993668 MD |
682 | } |
683 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
684 | switch (event->priv->instrumentation) { | |
685 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
686 | ret = -EINVAL; | |
687 | goto end; | |
688 | default: | |
689 | break; | |
690 | } | |
2b16f0c9 | 691 | break; |
dffef45d | 692 | default: |
9d993668 | 693 | break; |
dffef45d | 694 | } |
dffef45d | 695 | |
a67ba386 | 696 | if (!event->enabled) { |
dffef45d FD |
697 | ret = -EEXIST; |
698 | goto end; | |
699 | } | |
a67ba386 | 700 | switch (event->priv->instrumentation) { |
606828e4 MD |
701 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
702 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
703 | ret = -EINVAL; |
704 | break; | |
b4a75708 | 705 | |
606828e4 MD |
706 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
707 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 708 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 709 | break; |
b4a75708 | 710 | |
9d993668 MD |
711 | case LTTNG_KERNEL_ABI_KRETPROBE: |
712 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
713 | break; | |
714 | ||
606828e4 | 715 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 716 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
dffef45d FD |
717 | default: |
718 | WARN_ON_ONCE(1); | |
719 | ret = -EINVAL; | |
720 | } | |
721 | end: | |
722 | mutex_unlock(&sessions_mutex); | |
723 | return ret; | |
724 | } | |
725 | ||
a90917c3 | 726 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
727 | const char *transport_name, |
728 | void *buf_addr, | |
4e3c1b9b MD |
729 | size_t subbuf_size, size_t num_subbuf, |
730 | unsigned int switch_timer_interval, | |
d83004aa JD |
731 | unsigned int read_timer_interval, |
732 | enum channel_type channel_type) | |
4e3c1b9b | 733 | { |
a90917c3 MD |
734 | struct lttng_channel *chan; |
735 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
736 | |
737 | mutex_lock(&sessions_mutex); | |
d83004aa | 738 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 739 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 740 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 741 | if (!transport) { |
5a15f70c | 742 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 743 | transport_name); |
c0e31d2e | 744 | goto notransport; |
f3d01b96 | 745 | } |
a33c9927 | 746 | if (!try_module_get(transport->owner)) { |
5a15f70c | 747 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
748 | goto notransport; |
749 | } | |
a90917c3 | 750 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 751 | if (!chan) |
c0e31d2e | 752 | goto nomem; |
4e3c1b9b | 753 | chan->session = session; |
05d32c64 | 754 | chan->id = session->free_chan_id++; |
3b731ab1 | 755 | chan->ops = &transport->ops; |
125b4df4 MD |
756 | /* |
757 | * Note: the channel creation op already writes into the packet | |
758 | * headers. Therefore the "chan" information used as input | |
759 | * should be already accessible. | |
760 | */ | |
5f5ddf01 MD |
761 | chan->chan = transport->ops.channel_create(transport_name, |
762 | chan, buf_addr, subbuf_size, num_subbuf, | |
763 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
764 | if (!chan->chan) |
765 | goto create_error; | |
3c997079 | 766 | chan->tstate = 1; |
e64957da | 767 | chan->enabled = 1; |
a33c9927 | 768 | chan->transport = transport; |
d83004aa | 769 | chan->channel_type = channel_type; |
4e3c1b9b MD |
770 | list_add(&chan->list, &session->chan); |
771 | mutex_unlock(&sessions_mutex); | |
772 | return chan; | |
773 | ||
f3d01b96 MD |
774 | create_error: |
775 | kfree(chan); | |
c0e31d2e | 776 | nomem: |
a33c9927 MD |
777 | if (transport) |
778 | module_put(transport->owner); | |
c0e31d2e | 779 | notransport: |
e5382b6d | 780 | active: |
4e3c1b9b MD |
781 | mutex_unlock(&sessions_mutex); |
782 | return NULL; | |
783 | } | |
784 | ||
785 | /* | |
d83004aa JD |
786 | * Only used internally at session destruction for per-cpu channels, and |
787 | * when metadata channel is released. | |
788 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 789 | */ |
aa7c23a9 | 790 | static |
a90917c3 | 791 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 792 | { |
11b5a3c2 | 793 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 794 | module_put(chan->transport->owner); |
4e3c1b9b | 795 | list_del(&chan->list); |
437d5aa5 | 796 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
797 | kfree(chan); |
798 | } | |
799 | ||
d83004aa JD |
800 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
801 | { | |
802 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
803 | ||
804 | /* Protect the metadata cache with the sessions_mutex. */ | |
805 | mutex_lock(&sessions_mutex); | |
806 | _lttng_channel_destroy(chan); | |
807 | mutex_unlock(&sessions_mutex); | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
810 | ||
811 | static | |
812 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
813 | { | |
814 | stream->finalized = 1; | |
815 | wake_up_interruptible(&stream->read_wait); | |
816 | } | |
817 | ||
a101fa10 | 818 | |
e5382b6d MD |
819 | /* |
820 | * Supports event creation while tracing session is active. | |
3c997079 | 821 | * Needs to be called with sessions mutex held. |
e5382b6d | 822 | */ |
a67ba386 | 823 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 824 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 825 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 826 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 827 | { |
3c997079 | 828 | struct lttng_session *session = chan->session; |
a67ba386 MD |
829 | struct lttng_kernel_event_recorder *event_recorder; |
830 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
831 | const char *event_name; |
832 | struct hlist_head *head; | |
3d084699 | 833 | int ret; |
4e3c1b9b | 834 | |
abc0446a | 835 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 836 | ret = -EMFILE; |
e5382b6d | 837 | goto full; |
abc0446a | 838 | } |
3c997079 MD |
839 | |
840 | switch (itype) { | |
606828e4 | 841 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 842 | event_name = event_desc->event_name; |
3c997079 | 843 | break; |
b4a75708 | 844 | |
606828e4 MD |
845 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
846 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
847 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
848 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
849 | event_name = event_param->name; |
850 | break; | |
b4a75708 | 851 | |
606828e4 MD |
852 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
853 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
854 | default: |
855 | WARN_ON_ONCE(1); | |
856 | ret = -EINVAL; | |
857 | goto type_error; | |
858 | } | |
4a11ef1c FD |
859 | |
860 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
861 | LTTNG_EVENT_HT_SIZE, event_name); | |
a67ba386 MD |
862 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
863 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
864 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 865 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 866 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
867 | ret = -EEXIST; |
868 | goto exist; | |
abc0446a MD |
869 | } |
870 | } | |
3c997079 | 871 | |
a67ba386 MD |
872 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
873 | if (!event_recorder) { | |
4cf0bf51 | 874 | ret = -ENOMEM; |
4e3c1b9b | 875 | goto cache_error; |
abc0446a | 876 | } |
a67ba386 MD |
877 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
878 | if (!event_recorder_priv) { | |
879 | ret = -ENOMEM; | |
880 | goto cache_private_error; | |
881 | } | |
882 | event_recorder_priv->pub = event_recorder; | |
883 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
884 | event_recorder->priv = event_recorder_priv; | |
885 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
886 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
887 | ||
888 | event_recorder->chan = chan; | |
889 | event_recorder->priv->id = chan->free_event_id++; | |
890 | event_recorder->priv->parent.instrumentation = itype; | |
891 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
892 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
893 | |
894 | switch (itype) { | |
606828e4 | 895 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 896 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
897 | event_recorder->parent.enabled = 0; |
898 | event_recorder->priv->parent.registered = 0; | |
899 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
900 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 901 | ret = -ENOENT; |
d3dbe23c | 902 | goto register_error; |
abc0446a | 903 | } |
3c997079 MD |
904 | /* Populate lttng_event structure before event registration. */ |
905 | smp_wmb(); | |
baf20995 | 906 | break; |
b4a75708 | 907 | |
606828e4 | 908 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
909 | /* |
910 | * Needs to be explicitly enabled after creation, since | |
911 | * we may want to apply filters. | |
912 | */ | |
a67ba386 MD |
913 | event_recorder->parent.enabled = 0; |
914 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
915 | /* |
916 | * Populate lttng_event structure before event | |
917 | * registration. | |
918 | */ | |
919 | smp_wmb(); | |
8bf17deb | 920 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
921 | event_param->u.kprobe.symbol_name, |
922 | event_param->u.kprobe.offset, | |
923 | event_param->u.kprobe.addr, | |
a67ba386 | 924 | event_recorder); |
abc0446a | 925 | if (ret) { |
4cf0bf51 | 926 | ret = -EINVAL; |
d6d808f3 | 927 | goto register_error; |
abc0446a | 928 | } |
a67ba386 | 929 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 930 | WARN_ON_ONCE(!ret); |
d6d808f3 | 931 | break; |
b4a75708 | 932 | |
606828e4 | 933 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 934 | { |
a67ba386 MD |
935 | struct lttng_kernel_event_recorder *event_recorder_return; |
936 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
937 | |
938 | /* kretprobe defines 2 events */ | |
a0493bef MD |
939 | /* |
940 | * Needs to be explicitly enabled after creation, since | |
941 | * we may want to apply filters. | |
942 | */ | |
a67ba386 MD |
943 | event_recorder->parent.enabled = 0; |
944 | event_recorder->priv->parent.registered = 1; | |
945 | ||
946 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
947 | if (!event_recorder_return) { | |
948 | ret = -ENOMEM; | |
949 | goto register_error; | |
950 | } | |
951 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
952 | if (!event_recorder_return_priv) { | |
953 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 954 | ret = -ENOMEM; |
7371f44c | 955 | goto register_error; |
abc0446a | 956 | } |
a67ba386 MD |
957 | event_recorder_return_priv->pub = event_recorder_return; |
958 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
959 | event_recorder_return->priv = event_recorder_return_priv; | |
960 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
961 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
962 | ||
963 | event_recorder_return->chan = chan; | |
964 | event_recorder_return->priv->id = chan->free_event_id++; | |
965 | event_recorder_return->priv->parent.instrumentation = itype; | |
966 | event_recorder_return->parent.enabled = 0; | |
967 | event_recorder_return->priv->parent.registered = 1; | |
968 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
969 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.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, | |
a67ba386 | 978 | event_recorder, event_recorder_return); |
7371f44c | 979 | if (ret) { |
a67ba386 MD |
980 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
981 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 982 | ret = -EINVAL; |
7371f44c MD |
983 | goto register_error; |
984 | } | |
985 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 986 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 987 | WARN_ON_ONCE(!ret); |
a67ba386 | 988 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 989 | WARN_ON_ONCE(!ret); |
a90917c3 | 990 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
a67ba386 | 991 | event_recorder_return); |
abc0446a | 992 | WARN_ON_ONCE(ret > 0); |
7371f44c | 993 | if (ret) { |
a67ba386 MD |
994 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
995 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
996 | module_put(event_recorder_return->priv->parent.desc->owner); | |
997 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
998 | goto statedump_error; |
999 | } | |
a67ba386 | 1000 | list_add(&event_recorder_return->priv->node, &chan->session->events); |
7371f44c MD |
1001 | break; |
1002 | } | |
b4a75708 | 1003 | |
606828e4 | 1004 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1005 | /* |
1006 | * Needs to be explicitly enabled after creation, since | |
1007 | * we may want to apply filters. | |
1008 | */ | |
a67ba386 MD |
1009 | event_recorder->parent.enabled = 0; |
1010 | event_recorder->priv->parent.registered = 0; | |
1011 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1012 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1013 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1014 | ret = -EINVAL; |
1015 | goto register_error; | |
606828e4 | 1016 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1017 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1018 | break; |
606828e4 | 1019 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1020 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1021 | break; |
1022 | } | |
1023 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1024 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1025 | ret = -EINVAL; |
1026 | goto register_error; | |
606828e4 | 1027 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1028 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1029 | break; |
606828e4 | 1030 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1031 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1032 | break; |
1033 | } | |
a67ba386 | 1034 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1035 | ret = -EINVAL; |
259b6cb3 | 1036 | goto register_error; |
abc0446a | 1037 | } |
1ec65de1 | 1038 | break; |
b4a75708 | 1039 | |
606828e4 | 1040 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1041 | /* |
1042 | * Needs to be explicitly enabled after creation, since | |
1043 | * we may want to apply filters. | |
1044 | */ | |
a67ba386 MD |
1045 | event_recorder->parent.enabled = 0; |
1046 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1047 | |
a344f64b FD |
1048 | /* |
1049 | * Populate lttng_event structure before event | |
1050 | * registration. | |
1051 | */ | |
1052 | smp_wmb(); | |
149b9a9d | 1053 | |
83b802dc | 1054 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1055 | event_param->u.uprobe.fd, |
a67ba386 | 1056 | event_recorder); |
149b9a9d YB |
1057 | if (ret) |
1058 | goto register_error; | |
a67ba386 | 1059 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1060 | WARN_ON_ONCE(!ret); |
1061 | break; | |
b4a75708 | 1062 | |
606828e4 MD |
1063 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1064 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1065 | default: |
1066 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1067 | ret = -EINVAL; |
df07930b | 1068 | goto register_error; |
baf20995 | 1069 | } |
a67ba386 | 1070 | ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder); |
abc0446a MD |
1071 | WARN_ON_ONCE(ret > 0); |
1072 | if (ret) { | |
c099397a | 1073 | goto statedump_error; |
abc0446a | 1074 | } |
a67ba386 MD |
1075 | hlist_add_head(&event_recorder->priv->hlist, head); |
1076 | list_add(&event_recorder->priv->node, &chan->session->events); | |
1077 | return event_recorder; | |
4e3c1b9b | 1078 | |
c099397a | 1079 | statedump_error: |
259b6cb3 | 1080 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1081 | register_error: |
a67ba386 MD |
1082 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1083 | cache_private_error: | |
1084 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1085 | cache_error: |
1086 | exist: | |
3c997079 | 1087 | type_error: |
e5382b6d | 1088 | full: |
4cf0bf51 | 1089 | return ERR_PTR(ret); |
4e3c1b9b MD |
1090 | } |
1091 | ||
a67ba386 | 1092 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1093 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1094 | uint64_t token, uint64_t error_counter_index, |
1095 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1096 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1097 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1098 | { |
a67ba386 MD |
1099 | struct lttng_kernel_event_notifier *event_notifier; |
1100 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1101 | struct lttng_counter *error_counter; |
dffef45d FD |
1102 | const char *event_name; |
1103 | struct hlist_head *head; | |
1104 | int ret; | |
1105 | ||
1106 | switch (itype) { | |
606828e4 | 1107 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1108 | event_name = event_desc->event_name; |
b01155ba | 1109 | break; |
b4a75708 | 1110 | |
606828e4 MD |
1111 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1112 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1113 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1114 | event_name = event_notifier_param->event.name; |
1115 | break; | |
b4a75708 | 1116 | |
606828e4 MD |
1117 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1118 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1119 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1120 | default: |
1121 | WARN_ON_ONCE(1); | |
1122 | ret = -EINVAL; | |
1123 | goto type_error; | |
1124 | } | |
1125 | ||
1126 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1127 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1128 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1129 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1130 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1131 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1132 | && event_notifier_group == event_notifier_priv->group |
1133 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1134 | ret = -EEXIST; |
1135 | goto exist; | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1140 | if (!event_notifier) { | |
1141 | ret = -ENOMEM; | |
1142 | goto cache_error; | |
1143 | } | |
a67ba386 MD |
1144 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1145 | if (!event_notifier_priv) { | |
1146 | ret = -ENOMEM; | |
1147 | goto cache_private_error; | |
1148 | } | |
1149 | event_notifier_priv->pub = event_notifier; | |
1150 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1151 | event_notifier->priv = event_notifier_priv; | |
1152 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1153 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1154 | ||
1155 | event_notifier->priv->group = event_notifier_group; | |
1156 | event_notifier->priv->parent.user_token = token; | |
1157 | event_notifier->priv->error_counter_index = error_counter_index; | |
1158 | event_notifier->priv->num_captures = 0; | |
1159 | event_notifier->priv->parent.instrumentation = itype; | |
1160 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1161 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1162 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1163 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
dffef45d FD |
1164 | |
1165 | switch (itype) { | |
606828e4 | 1166 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1167 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1168 | event_notifier->parent.enabled = 0; |
1169 | event_notifier->priv->parent.registered = 0; | |
1170 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1171 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1172 | ret = -ENOENT; |
1173 | goto register_error; | |
1174 | } | |
1175 | /* Populate lttng_event_notifier structure before event registration. */ | |
1176 | smp_wmb(); | |
1177 | break; | |
b4a75708 | 1178 | |
606828e4 | 1179 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1180 | /* |
1181 | * Needs to be explicitly enabled after creation, since | |
1182 | * we may want to apply filters. | |
1183 | */ | |
a67ba386 MD |
1184 | event_notifier->parent.enabled = 0; |
1185 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1186 | /* |
1187 | * Populate lttng_event_notifier structure before event | |
1188 | * registration. | |
1189 | */ | |
1190 | smp_wmb(); | |
1191 | ret = lttng_kprobes_register_event_notifier( | |
1192 | event_notifier_param->event.u.kprobe.symbol_name, | |
1193 | event_notifier_param->event.u.kprobe.offset, | |
1194 | event_notifier_param->event.u.kprobe.addr, | |
1195 | event_notifier); | |
1196 | if (ret) { | |
1197 | ret = -EINVAL; | |
1198 | goto register_error; | |
1199 | } | |
a67ba386 | 1200 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1201 | WARN_ON_ONCE(!ret); |
1202 | break; | |
b4a75708 | 1203 | |
606828e4 | 1204 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1205 | /* |
1206 | * Needs to be explicitly enabled after creation, since | |
1207 | * we may want to apply filters. | |
1208 | */ | |
a67ba386 MD |
1209 | event_notifier->parent.enabled = 0; |
1210 | event_notifier->priv->parent.registered = 0; | |
1211 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1212 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1213 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1214 | ret = -EINVAL; |
1215 | goto register_error; | |
606828e4 | 1216 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1217 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1218 | break; |
606828e4 | 1219 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1220 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1221 | break; |
1222 | } | |
1223 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1224 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1225 | ret = -EINVAL; |
1226 | goto register_error; | |
606828e4 | 1227 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1228 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1229 | break; |
606828e4 | 1230 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1231 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1232 | break; |
1233 | } | |
1234 | ||
a67ba386 | 1235 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1236 | ret = -EINVAL; |
1237 | goto register_error; | |
1238 | } | |
1239 | break; | |
b4a75708 | 1240 | |
606828e4 | 1241 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1242 | /* |
1243 | * Needs to be explicitly enabled after creation, since | |
1244 | * we may want to apply filters. | |
1245 | */ | |
a67ba386 MD |
1246 | event_notifier->parent.enabled = 0; |
1247 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1248 | |
1249 | /* | |
1250 | * Populate lttng_event_notifier structure before | |
1251 | * event_notifier registration. | |
1252 | */ | |
1253 | smp_wmb(); | |
1254 | ||
1255 | ret = lttng_uprobes_register_event_notifier( | |
1256 | event_notifier_param->event.name, | |
1257 | event_notifier_param->event.u.uprobe.fd, | |
1258 | event_notifier); | |
1259 | if (ret) | |
1260 | goto register_error; | |
a67ba386 | 1261 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1262 | WARN_ON_ONCE(!ret); |
1263 | break; | |
b4a75708 | 1264 | |
606828e4 MD |
1265 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1266 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1267 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1268 | default: |
1269 | WARN_ON_ONCE(1); | |
1270 | ret = -EINVAL; | |
1271 | goto register_error; | |
1272 | } | |
1273 | ||
a67ba386 MD |
1274 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1275 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1276 | |
1277 | /* | |
1278 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1279 | * bucket is currently in use. We trust it. The session lock |
1280 | * synchronizes against concurrent creation of the error | |
1281 | * counter. | |
99f52fcc | 1282 | */ |
ab04d7b1 MD |
1283 | error_counter = event_notifier_group->error_counter; |
1284 | if (error_counter) { | |
99f52fcc FD |
1285 | size_t dimension_index[1]; |
1286 | ||
1287 | /* | |
1288 | * Check that the index is within the boundary of the counter. | |
1289 | */ | |
a67ba386 | 1290 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1291 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1292 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1293 | ret = -EINVAL; |
1294 | goto register_error; | |
1295 | } | |
1296 | ||
a67ba386 | 1297 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1298 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1299 | if (ret) { |
1300 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1301 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1302 | goto register_error; |
1303 | } | |
1304 | } | |
1305 | ||
dffef45d FD |
1306 | return event_notifier; |
1307 | ||
1308 | register_error: | |
a67ba386 MD |
1309 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1310 | cache_private_error: | |
dffef45d FD |
1311 | kmem_cache_free(event_notifier_cache, event_notifier); |
1312 | cache_error: | |
1313 | exist: | |
1314 | type_error: | |
1315 | return ERR_PTR(ret); | |
1316 | } | |
1317 | ||
99f52fcc FD |
1318 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1319 | const size_t *dim_indexes, int32_t cpu, | |
1320 | int64_t *val, bool *overflow, bool *underflow) | |
1321 | { | |
1322 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1323 | cpu, val, overflow, underflow); | |
1324 | } | |
1325 | ||
1326 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1327 | const size_t *dim_indexes, int64_t *val, | |
1328 | bool *overflow, bool *underflow) | |
1329 | { | |
1330 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1331 | val, overflow, underflow); | |
1332 | } | |
1333 | ||
1334 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1335 | const size_t *dim_indexes) | |
1336 | { | |
1337 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1338 | } | |
1339 | ||
a67ba386 | 1340 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 1341 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1342 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1343 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1344 | { |
a67ba386 | 1345 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1346 | |
1347 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1348 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1349 | mutex_unlock(&sessions_mutex); |
1350 | return event; | |
1351 | } | |
1352 | ||
a67ba386 | 1353 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1354 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1355 | uint64_t id, uint64_t error_counter_index, |
1356 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1357 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1358 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1359 | { |
a67ba386 | 1360 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1361 | |
1362 | mutex_lock(&sessions_mutex); | |
1363 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1364 | error_counter_index, event_notifier_group, |
a67ba386 | 1365 | event_notifier_param, itype); |
dffef45d FD |
1366 | mutex_unlock(&sessions_mutex); |
1367 | return event_notifier; | |
1368 | } | |
1369 | ||
3c997079 MD |
1370 | /* Only used for tracepoints for now. */ |
1371 | static | |
a67ba386 | 1372 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1373 | { |
437d5aa5 | 1374 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1375 | int ret = -EINVAL; |
3c997079 | 1376 | |
a67ba386 | 1377 | if (event_recorder->priv->parent.registered) |
3c997079 | 1378 | return; |
4ecb5ad5 | 1379 | |
a67ba386 MD |
1380 | desc = event_recorder->priv->parent.desc; |
1381 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1382 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1383 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 | 1384 | desc->probe_callback, |
a67ba386 | 1385 | event_recorder); |
4ecb5ad5 | 1386 | break; |
b4a75708 | 1387 | |
606828e4 | 1388 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1389 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1390 | break; |
b4a75708 | 1391 | |
606828e4 MD |
1392 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1393 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1394 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1395 | ret = 0; |
1396 | break; | |
b4a75708 | 1397 | |
606828e4 MD |
1398 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1399 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1400 | default: |
1401 | WARN_ON_ONCE(1); | |
1402 | } | |
3c997079 | 1403 | if (!ret) |
a67ba386 | 1404 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1405 | } |
1406 | ||
4e3c1b9b MD |
1407 | /* |
1408 | * Only used internally at session destruction. | |
1409 | */ | |
a67ba386 | 1410 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1411 | { |
a67ba386 | 1412 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1413 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1414 | int ret = -EINVAL; |
1415 | ||
a67ba386 | 1416 | if (!event_priv->registered) |
3c997079 MD |
1417 | return 0; |
1418 | ||
a67ba386 MD |
1419 | desc = event_priv->desc; |
1420 | switch (event_priv->instrumentation) { | |
606828e4 | 1421 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1422 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
1423 | event_priv->desc->probe_callback, | |
1424 | event_recorder); | |
baf20995 | 1425 | break; |
b4a75708 | 1426 | |
606828e4 | 1427 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1428 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1429 | ret = 0; |
1430 | break; | |
b4a75708 | 1431 | |
606828e4 | 1432 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1433 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1434 | ret = 0; |
1435 | break; | |
b4a75708 | 1436 | |
606828e4 | 1437 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1438 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1439 | break; |
b4a75708 | 1440 | |
606828e4 | 1441 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1442 | ret = 0; |
1443 | break; | |
b4a75708 | 1444 | |
606828e4 | 1445 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1446 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1447 | ret = 0; |
1448 | break; | |
b4a75708 | 1449 | |
606828e4 | 1450 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1451 | default: |
1452 | WARN_ON_ONCE(1); | |
1453 | } | |
3c997079 | 1454 | if (!ret) |
a67ba386 | 1455 | event_priv->registered = 0; |
dda6a249 MD |
1456 | return ret; |
1457 | } | |
1458 | ||
dffef45d FD |
1459 | /* Only used for tracepoints for now. */ |
1460 | static | |
a67ba386 | 1461 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1462 | { |
437d5aa5 | 1463 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1464 | int ret = -EINVAL; |
1465 | ||
a67ba386 | 1466 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1467 | return; |
1468 | ||
a67ba386 MD |
1469 | desc = event_notifier->priv->parent.desc; |
1470 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1471 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1472 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e2d5dbc7 | 1473 | desc->probe_callback, |
b01155ba FD |
1474 | event_notifier); |
1475 | break; | |
b4a75708 | 1476 | |
606828e4 | 1477 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1478 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1479 | break; | |
b4a75708 | 1480 | |
606828e4 MD |
1481 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1482 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1483 | ret = 0; |
1484 | break; | |
b4a75708 | 1485 | |
606828e4 MD |
1486 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1487 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1488 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1489 | default: |
1490 | WARN_ON_ONCE(1); | |
1491 | } | |
1492 | if (!ret) | |
a67ba386 | 1493 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1494 | } |
1495 | ||
1496 | static | |
1497 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1498 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1499 | { |
437d5aa5 | 1500 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1501 | int ret = -EINVAL; |
1502 | ||
a67ba386 | 1503 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1504 | return 0; |
1505 | ||
a67ba386 MD |
1506 | desc = event_notifier->priv->parent.desc; |
1507 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1508 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1509 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e2d5dbc7 | 1510 | event_notifier->priv->parent.desc->probe_callback, |
b01155ba FD |
1511 | event_notifier); |
1512 | break; | |
b4a75708 | 1513 | |
606828e4 | 1514 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1515 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1516 | ret = 0; | |
1517 | break; | |
b4a75708 | 1518 | |
606828e4 | 1519 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1520 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1521 | ret = 0; | |
1522 | break; | |
b4a75708 | 1523 | |
606828e4 | 1524 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1525 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1526 | break; | |
b4a75708 | 1527 | |
606828e4 MD |
1528 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1529 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1530 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1531 | default: |
1532 | WARN_ON_ONCE(1); | |
1533 | } | |
1534 | if (!ret) | |
a67ba386 | 1535 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1536 | return ret; |
1537 | } | |
1538 | ||
dda6a249 MD |
1539 | /* |
1540 | * Only used internally at session destruction. | |
1541 | */ | |
be066e6c | 1542 | static |
0648898e | 1543 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1544 | { |
0648898e | 1545 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1546 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1547 | ||
0648898e MD |
1548 | lttng_free_event_filter_runtime(event); |
1549 | /* Free event enabler refs */ | |
1550 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1551 | &event_priv->enablers_ref_head, node) | |
1552 | kfree(enabler_ref); | |
b4a75708 | 1553 | |
0648898e MD |
1554 | switch (event->type) { |
1555 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1556 | { | |
1557 | struct lttng_kernel_event_recorder *event_recorder = | |
1558 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1559 | |
0648898e MD |
1560 | switch (event_priv->instrumentation) { |
1561 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1562 | lttng_event_desc_put(event_priv->desc); | |
1563 | break; | |
b4a75708 | 1564 | |
0648898e MD |
1565 | case LTTNG_KERNEL_ABI_KPROBE: |
1566 | module_put(event_priv->desc->owner); | |
1567 | lttng_kprobes_destroy_event_private(event_recorder); | |
1568 | break; | |
b4a75708 | 1569 | |
0648898e MD |
1570 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1571 | module_put(event_priv->desc->owner); | |
1572 | lttng_kretprobes_destroy_private(event_recorder); | |
1573 | break; | |
b4a75708 | 1574 | |
0648898e MD |
1575 | case LTTNG_KERNEL_ABI_SYSCALL: |
1576 | break; | |
4e3c1b9b | 1577 | |
0648898e MD |
1578 | case LTTNG_KERNEL_ABI_UPROBE: |
1579 | module_put(event_priv->desc->owner); | |
1580 | lttng_uprobes_destroy_event_private(event_recorder); | |
1581 | break; | |
3ef5cc03 | 1582 | |
0648898e MD |
1583 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1584 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1585 | default: | |
1586 | WARN_ON_ONCE(1); | |
1587 | } | |
1588 | list_del(&event_recorder->priv->node); | |
1589 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1590 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1591 | break; |
0648898e MD |
1592 | } |
1593 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1594 | { | |
1595 | struct lttng_kernel_event_notifier *event_notifier = | |
1596 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1597 | |
0648898e MD |
1598 | switch (event_notifier->priv->parent.instrumentation) { |
1599 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1600 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1601 | break; | |
b4a75708 | 1602 | |
0648898e MD |
1603 | case LTTNG_KERNEL_ABI_KPROBE: |
1604 | module_put(event_notifier->priv->parent.desc->owner); | |
1605 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1606 | break; | |
b4a75708 | 1607 | |
0648898e MD |
1608 | case LTTNG_KERNEL_ABI_SYSCALL: |
1609 | break; | |
b4a75708 | 1610 | |
0648898e MD |
1611 | case LTTNG_KERNEL_ABI_UPROBE: |
1612 | module_put(event_notifier->priv->parent.desc->owner); | |
1613 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1614 | break; | |
1615 | ||
1616 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1617 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1618 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1619 | default: | |
1620 | WARN_ON_ONCE(1); | |
1621 | } | |
1622 | list_del(&event_notifier->priv->node); | |
1623 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1624 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1625 | break; | |
1626 | } | |
dffef45d FD |
1627 | default: |
1628 | WARN_ON_ONCE(1); | |
1629 | } | |
dffef45d FD |
1630 | } |
1631 | ||
d1f652f8 MD |
1632 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1633 | enum tracker_type tracker_type) | |
e0130fab | 1634 | { |
d1f652f8 MD |
1635 | switch (tracker_type) { |
1636 | case TRACKER_PID: | |
1637 | return &session->pid_tracker; | |
1638 | case TRACKER_VPID: | |
1639 | return &session->vpid_tracker; | |
1640 | case TRACKER_UID: | |
1641 | return &session->uid_tracker; | |
1642 | case TRACKER_VUID: | |
1643 | return &session->vuid_tracker; | |
1644 | case TRACKER_GID: | |
1645 | return &session->gid_tracker; | |
1646 | case TRACKER_VGID: | |
1647 | return &session->vgid_tracker; | |
1648 | default: | |
1649 | WARN_ON_ONCE(1); | |
1650 | return NULL; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | int lttng_session_track_id(struct lttng_session *session, | |
1655 | enum tracker_type tracker_type, int id) | |
1656 | { | |
1657 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1658 | int ret; |
1659 | ||
d1f652f8 MD |
1660 | tracker = get_tracker(session, tracker_type); |
1661 | if (!tracker) | |
1662 | return -EINVAL; | |
1663 | if (id < -1) | |
e0130fab MD |
1664 | return -EINVAL; |
1665 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1666 | if (id == -1) { |
1667 | /* track all ids: destroy tracker. */ | |
1668 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1669 | ret = 0; |
1670 | } else { | |
d1f652f8 | 1671 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1672 | } |
e0130fab MD |
1673 | mutex_unlock(&sessions_mutex); |
1674 | return ret; | |
1675 | } | |
1676 | ||
d1f652f8 MD |
1677 | int lttng_session_untrack_id(struct lttng_session *session, |
1678 | enum tracker_type tracker_type, int id) | |
e0130fab | 1679 | { |
d1f652f8 | 1680 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1681 | int ret; |
1682 | ||
d1f652f8 MD |
1683 | tracker = get_tracker(session, tracker_type); |
1684 | if (!tracker) | |
1685 | return -EINVAL; | |
1686 | if (id < -1) | |
e0130fab MD |
1687 | return -EINVAL; |
1688 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1689 | if (id == -1) { |
1690 | /* untrack all ids: replace by empty tracker. */ | |
1691 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1692 | } else { |
d1f652f8 | 1693 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1694 | } |
e0130fab MD |
1695 | mutex_unlock(&sessions_mutex); |
1696 | return ret; | |
1697 | } | |
1698 | ||
7e6f9ef6 | 1699 | static |
d1f652f8 | 1700 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1701 | { |
d1f652f8 MD |
1702 | struct lttng_id_tracker *id_tracker = m->private; |
1703 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1704 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1705 | int iter = 0, i; |
1706 | ||
1707 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1708 | if (id_tracker_p) { |
1709 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1710 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1711 | |
f934e302 | 1712 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1713 | if (iter++ >= *pos) |
1714 | return e; | |
1715 | } | |
1716 | } | |
1717 | } else { | |
d1f652f8 | 1718 | /* ID tracker disabled. */ |
7e6f9ef6 | 1719 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1720 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1721 | } |
1722 | iter++; | |
1723 | } | |
1724 | /* End of list */ | |
1725 | return NULL; | |
1726 | } | |
1727 | ||
1728 | /* Called with sessions_mutex held. */ | |
1729 | static | |
d1f652f8 | 1730 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1731 | { |
d1f652f8 MD |
1732 | struct lttng_id_tracker *id_tracker = m->private; |
1733 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1734 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1735 | int iter = 0, i; |
1736 | ||
1737 | (*ppos)++; | |
d1f652f8 MD |
1738 | if (id_tracker_p) { |
1739 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1740 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1741 | |
f934e302 | 1742 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1743 | if (iter++ >= *ppos) |
1744 | return e; | |
1745 | } | |
1746 | } | |
1747 | } else { | |
d1f652f8 | 1748 | /* ID tracker disabled. */ |
7e6f9ef6 | 1749 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1750 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1751 | iter++; |
1752 | } | |
1753 | ||
1754 | /* End of list */ | |
1755 | return NULL; | |
1756 | } | |
1757 | ||
1758 | static | |
d1f652f8 | 1759 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1760 | { |
1761 | mutex_unlock(&sessions_mutex); | |
1762 | } | |
1763 | ||
1764 | static | |
d1f652f8 | 1765 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1766 | { |
d1f652f8 MD |
1767 | struct lttng_id_tracker *id_tracker = m->private; |
1768 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1769 | int id; | |
7e6f9ef6 | 1770 | |
d1f652f8 | 1771 | if (p == id_tracker_p) { |
7e6f9ef6 | 1772 | /* Tracker disabled. */ |
d1f652f8 | 1773 | id = -1; |
7e6f9ef6 | 1774 | } else { |
d1f652f8 | 1775 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1776 | |
d1f652f8 MD |
1777 | id = lttng_id_tracker_get_node_id(e); |
1778 | } | |
1779 | switch (id_tracker->tracker_type) { | |
1780 | case TRACKER_PID: | |
1781 | seq_printf(m, "process { pid = %d; };\n", id); | |
1782 | break; | |
1783 | case TRACKER_VPID: | |
1784 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1785 | break; | |
1786 | case TRACKER_UID: | |
1787 | seq_printf(m, "user { uid = %d; };\n", id); | |
1788 | break; | |
1789 | case TRACKER_VUID: | |
1790 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1791 | break; | |
1792 | case TRACKER_GID: | |
1793 | seq_printf(m, "group { gid = %d; };\n", id); | |
1794 | break; | |
1795 | case TRACKER_VGID: | |
1796 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1797 | break; | |
1798 | default: | |
1799 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1800 | } |
7e6f9ef6 MD |
1801 | return 0; |
1802 | } | |
1803 | ||
1804 | static | |
d1f652f8 MD |
1805 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1806 | .start = id_list_start, | |
1807 | .next = id_list_next, | |
1808 | .stop = id_list_stop, | |
1809 | .show = id_list_show, | |
7e6f9ef6 MD |
1810 | }; |
1811 | ||
1812 | static | |
d1f652f8 | 1813 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1814 | { |
d1f652f8 | 1815 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1816 | } |
1817 | ||
1818 | static | |
d1f652f8 | 1819 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1820 | { |
1821 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1822 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1823 | int ret; |
1824 | ||
d1f652f8 | 1825 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1826 | ret = seq_release(inode, file); |
d1f652f8 MD |
1827 | if (!ret) |
1828 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1829 | return ret; |
1830 | } | |
1831 | ||
d1f652f8 | 1832 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1833 | .owner = THIS_MODULE, |
d1f652f8 | 1834 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1835 | .read = seq_read, |
1836 | .llseek = seq_lseek, | |
d1f652f8 | 1837 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1838 | }; |
1839 | ||
d1f652f8 MD |
1840 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1841 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1842 | { |
d1f652f8 | 1843 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1844 | struct seq_file *m; |
1845 | int file_fd, ret; | |
1846 | ||
1847 | file_fd = lttng_get_unused_fd(); | |
1848 | if (file_fd < 0) { | |
1849 | ret = file_fd; | |
1850 | goto fd_error; | |
1851 | } | |
1852 | ||
d1f652f8 MD |
1853 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1854 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1855 | NULL, O_RDWR); |
d1f652f8 MD |
1856 | if (IS_ERR(tracker_ids_list_file)) { |
1857 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1858 | goto file_error; |
1859 | } | |
98d7281c MJ |
1860 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1861 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1862 | goto refcount_error; |
1863 | } | |
d1f652f8 | 1864 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1865 | if (ret < 0) |
1866 | goto open_error; | |
d1f652f8 MD |
1867 | m = tracker_ids_list_file->private_data; |
1868 | ||
1869 | m->private = get_tracker(session, tracker_type); | |
1870 | BUG_ON(!m->private); | |
1871 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1872 | |
1873 | return file_fd; | |
1874 | ||
1875 | open_error: | |
9c1f4643 MD |
1876 | atomic_long_dec(&session->file->f_count); |
1877 | refcount_error: | |
d1f652f8 | 1878 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1879 | file_error: |
1880 | put_unused_fd(file_fd); | |
1881 | fd_error: | |
1882 | return ret; | |
1883 | } | |
1884 | ||
3c997079 MD |
1885 | /* |
1886 | * Enabler management. | |
1887 | */ | |
1888 | static | |
4993071a PP |
1889 | int lttng_match_enabler_star_glob(const char *desc_name, |
1890 | const char *pattern) | |
3c997079 | 1891 | { |
cbc19040 MD |
1892 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1893 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1894 | return 0; |
1895 | return 1; | |
1896 | } | |
1897 | ||
1898 | static | |
4ecb5ad5 MD |
1899 | int lttng_match_enabler_name(const char *desc_name, |
1900 | const char *name) | |
3c997079 | 1901 | { |
4ecb5ad5 | 1902 | if (strcmp(desc_name, name)) |
3c997079 MD |
1903 | return 0; |
1904 | return 1; | |
1905 | } | |
1906 | ||
437d5aa5 | 1907 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1908 | struct lttng_enabler *enabler) |
1909 | { | |
4ecb5ad5 | 1910 | const char *desc_name, *enabler_name; |
badfe9f5 | 1911 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1912 | |
1913 | enabler_name = enabler->event_param.name; | |
1914 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1915 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1916 | desc_name = desc->event_name; |
3b861b22 FD |
1917 | switch (enabler->format_type) { |
1918 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1919 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1920 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1921 | return lttng_match_enabler_name(desc_name, enabler_name); |
1922 | default: | |
1923 | return -EINVAL; | |
1924 | } | |
4ecb5ad5 | 1925 | break; |
b4a75708 | 1926 | |
606828e4 | 1927 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1928 | desc_name = desc->event_name; |
badfe9f5 | 1929 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1930 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1931 | compat = true; |
1932 | } | |
4ecb5ad5 MD |
1933 | if (!strncmp(desc_name, "syscall_exit_", |
1934 | strlen("syscall_exit_"))) { | |
1935 | desc_name += strlen("syscall_exit_"); | |
1936 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1937 | strlen("syscall_entry_"))) { | |
1938 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1939 | entry = true; |
4ecb5ad5 MD |
1940 | } else { |
1941 | WARN_ON_ONCE(1); | |
1942 | return -EINVAL; | |
1943 | } | |
badfe9f5 | 1944 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1945 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1946 | break; |
606828e4 | 1947 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1948 | if (!entry) |
1949 | return 0; | |
1950 | break; | |
606828e4 | 1951 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1952 | if (entry) |
1953 | return 0; | |
1954 | break; | |
1955 | default: | |
1956 | return -EINVAL; | |
1957 | } | |
1958 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1959 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1960 | break; |
606828e4 | 1961 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1962 | if (compat) |
1963 | return 0; | |
1964 | break; | |
606828e4 | 1965 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1966 | if (!compat) |
1967 | return 0; | |
1968 | break; | |
1969 | default: | |
1970 | return -EINVAL; | |
1971 | } | |
1972 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1973 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1974 | switch (enabler->format_type) { |
1975 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1976 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1977 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1978 | return lttng_match_enabler_name(desc_name, enabler_name); |
1979 | default: | |
1980 | return -EINVAL; | |
1981 | } | |
1982 | break; | |
606828e4 | 1983 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1984 | return -EINVAL; /* Not implemented. */ |
1985 | default: | |
1986 | return -EINVAL; | |
1987 | } | |
4ecb5ad5 | 1988 | break; |
b4a75708 | 1989 | |
4ecb5ad5 MD |
1990 | default: |
1991 | WARN_ON_ONCE(1); | |
1992 | return -EINVAL; | |
1993 | } | |
3c997079 MD |
1994 | } |
1995 | ||
1996 | static | |
b2bc0bc8 | 1997 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 1998 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1999 | { |
b2bc0bc8 FD |
2000 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2001 | event_enabler); | |
2002 | ||
a67ba386 | 2003 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2004 | return 0; |
a67ba386 MD |
2005 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2006 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2007 | return 1; |
2008 | else | |
2009 | return 0; | |
2010 | } | |
2011 | ||
b01155ba FD |
2012 | static |
2013 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2014 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2015 | { |
2016 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2017 | event_notifier_enabler); | |
2018 | ||
a67ba386 | 2019 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2020 | return 0; |
a67ba386 MD |
2021 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2022 | && event_notifier->priv->group == event_notifier_enabler->group | |
2023 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2024 | return 1; |
2025 | else | |
2026 | return 0; | |
2027 | } | |
2028 | ||
3c997079 | 2029 | static |
b2bc0bc8 FD |
2030 | struct lttng_enabler_ref *lttng_enabler_ref( |
2031 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2032 | struct lttng_enabler *enabler) |
2033 | { | |
2034 | struct lttng_enabler_ref *enabler_ref; | |
2035 | ||
b2bc0bc8 | 2036 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2037 | if (enabler_ref->ref == enabler) |
2038 | return enabler_ref; | |
2039 | } | |
2040 | return NULL; | |
2041 | } | |
2042 | ||
3c997079 | 2043 | static |
1b917d6b | 2044 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2045 | { |
b2bc0bc8 | 2046 | struct lttng_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2047 | struct lttng_kernel_probe_desc *probe_desc; |
2048 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2049 | int i; |
2050 | struct list_head *probe_list; | |
2051 | ||
2052 | probe_list = lttng_get_probe_list_head(); | |
2053 | /* | |
2054 | * For each probe event, if we find that a probe event matches | |
2055 | * our enabler, create an associated lttng_event if not | |
2056 | * already present. | |
2057 | */ | |
2058 | list_for_each_entry(probe_desc, probe_list, head) { | |
2059 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2060 | int found = 0; | |
2061 | struct hlist_head *head; | |
a67ba386 MD |
2062 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2063 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2064 | |
2065 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2066 | if (!lttng_desc_match_enabler(desc, |
2067 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2068 | continue; |
3c997079 MD |
2069 | |
2070 | /* | |
2071 | * Check if already created. | |
2072 | */ | |
4a11ef1c FD |
2073 | head = utils_borrow_hash_table_bucket( |
2074 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 2075 | desc->event_name); |
a67ba386 MD |
2076 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2077 | if (event_recorder_private->parent.desc == desc | |
2078 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2079 | found = 1; |
2080 | } | |
2081 | if (found) | |
2082 | continue; | |
2083 | ||
2084 | /* | |
2085 | * We need to create an event for this | |
2086 | * event probe. | |
2087 | */ | |
a67ba386 MD |
2088 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2089 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2090 | if (!event_recorder) { | |
5a15f70c | 2091 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2092 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2093 | } |
2094 | } | |
2095 | } | |
2096 | } | |
2097 | ||
b01155ba FD |
2098 | static |
2099 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2100 | { | |
2101 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2102 | struct lttng_kernel_probe_desc *probe_desc; |
2103 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2104 | int i; |
2105 | struct list_head *probe_list; | |
2106 | ||
2107 | probe_list = lttng_get_probe_list_head(); | |
2108 | /* | |
2109 | * For each probe event, if we find that a probe event matches | |
2110 | * our enabler, create an associated lttng_event_notifier if not | |
2111 | * already present. | |
2112 | */ | |
2113 | list_for_each_entry(probe_desc, probe_list, head) { | |
2114 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2115 | int found = 0; | |
2116 | struct hlist_head *head; | |
a67ba386 MD |
2117 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2118 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2119 | |
2120 | desc = probe_desc->event_desc[i]; | |
2121 | if (!lttng_desc_match_enabler(desc, | |
2122 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2123 | continue; | |
2124 | ||
2125 | /* | |
2126 | * Check if already created. | |
2127 | */ | |
2128 | head = utils_borrow_hash_table_bucket( | |
2129 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2130 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2131 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2132 | if (event_notifier_priv->parent.desc == desc | |
2133 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2134 | found = 1; |
2135 | } | |
2136 | if (found) | |
2137 | continue; | |
2138 | ||
2139 | /* | |
2140 | * We need to create a event_notifier for this event probe. | |
2141 | */ | |
2142 | event_notifier = _lttng_event_notifier_create(desc, | |
2143 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2144 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2145 | event_notifier_group, NULL, |
606828e4 | 2146 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2147 | if (IS_ERR(event_notifier)) { |
2148 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2149 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2150 | } |
2151 | } | |
2152 | } | |
2153 | } | |
2154 | ||
33a39a3c | 2155 | static |
1b917d6b | 2156 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2157 | { |
2158 | int ret; | |
2159 | ||
a67ba386 | 2160 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2161 | WARN_ON_ONCE(ret); |
2162 | } | |
2163 | ||
8a8ac9a8 FD |
2164 | static |
2165 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2166 | { | |
2167 | int ret; | |
2168 | ||
a67ba386 | 2169 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2170 | WARN_ON_ONCE(ret); |
a67ba386 | 2171 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2172 | WARN_ON_ONCE(ret); |
2173 | } | |
2174 | ||
33a39a3c | 2175 | /* |
a67ba386 | 2176 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2177 | * tracepoint probes. |
2178 | * Should be called with sessions mutex held. | |
2179 | */ | |
2180 | static | |
b2bc0bc8 | 2181 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2182 | { |
b2bc0bc8 | 2183 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2184 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2185 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2186 | break; |
b4a75708 | 2187 | |
606828e4 | 2188 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2189 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2190 | break; |
b4a75708 | 2191 | |
33a39a3c MD |
2192 | default: |
2193 | WARN_ON_ONCE(1); | |
2194 | break; | |
2195 | } | |
2196 | } | |
2197 | ||
3c997079 | 2198 | /* |
b2bc0bc8 | 2199 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2200 | * and add backward reference from the event to the enabler. |
2201 | * Should be called with sessions mutex held. | |
2202 | */ | |
2203 | static | |
b2bc0bc8 | 2204 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2205 | { |
b2bc0bc8 FD |
2206 | struct lttng_channel *chan = event_enabler->chan; |
2207 | struct lttng_session *session = event_enabler->chan->session; | |
2208 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
a67ba386 | 2209 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2210 | |
606828e4 MD |
2211 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2212 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2213 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2214 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2215 | int enabled = base_enabler->enabled; |
606828e4 | 2216 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2217 | |
606828e4 | 2218 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 MD |
2219 | WRITE_ONCE(chan->syscall_all_entry, enabled); |
2220 | ||
606828e4 | 2221 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 | 2222 | WRITE_ONCE(chan->syscall_all_exit, enabled); |
badfe9f5 MD |
2223 | } |
2224 | ||
3c997079 | 2225 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2226 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2227 | |
b2bc0bc8 | 2228 | /* For each event matching event_enabler in session event list. */ |
a67ba386 MD |
2229 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2230 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 MD |
2231 | struct lttng_enabler_ref *enabler_ref; |
2232 | ||
a67ba386 | 2233 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2234 | continue; |
a67ba386 | 2235 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2236 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2237 | if (!enabler_ref) { |
2238 | /* | |
2239 | * If no backward ref, create it. | |
b2bc0bc8 | 2240 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2241 | */ |
2242 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2243 | if (!enabler_ref) | |
2244 | return -ENOMEM; | |
b2bc0bc8 | 2245 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2246 | list_add(&enabler_ref->node, |
a67ba386 | 2247 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2248 | } |
2249 | ||
f127e61e MD |
2250 | /* |
2251 | * Link filter bytecodes if not linked yet. | |
2252 | */ | |
a67ba386 | 2253 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2254 | lttng_static_ctx, |
a67ba386 | 2255 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2256 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2257 | } |
2258 | return 0; | |
2259 | } | |
2260 | ||
b01155ba | 2261 | /* |
a67ba386 | 2262 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2263 | * tracepoint probes. |
2264 | * Should be called with sessions mutex held. | |
2265 | */ | |
2266 | static | |
2267 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2268 | { | |
2269 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2270 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2271 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2272 | break; | |
b4a75708 | 2273 | |
606828e4 | 2274 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2275 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2276 | break; | |
b4a75708 | 2277 | |
b01155ba FD |
2278 | default: |
2279 | WARN_ON_ONCE(1); | |
2280 | break; | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2286 | */ | |
2287 | static | |
8a8ac9a8 FD |
2288 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2289 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2290 | { |
2291 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2292 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2293 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2294 | |
606828e4 MD |
2295 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2296 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2297 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2298 | !strcmp(base_enabler->event_param.name, "*")) { |
2299 | ||
2300 | int enabled = base_enabler->enabled; | |
606828e4 | 2301 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2302 | |
606828e4 | 2303 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2304 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2305 | ||
606828e4 | 2306 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2307 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2308 | ||
2309 | } | |
2310 | ||
b01155ba FD |
2311 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2312 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2313 | ||
2314 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2315 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2316 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2317 | struct lttng_enabler_ref *enabler_ref; |
2318 | ||
2319 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2320 | continue; | |
2321 | ||
a67ba386 | 2322 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2323 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2324 | if (!enabler_ref) { | |
2325 | /* | |
2326 | * If no backward ref, create it. | |
2327 | * Add backward ref from event_notifier to enabler. | |
2328 | */ | |
2329 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2330 | if (!enabler_ref) | |
2331 | return -ENOMEM; | |
2332 | ||
2333 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2334 | event_notifier_enabler); | |
2335 | list_add(&enabler_ref->node, | |
a67ba386 | 2336 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2337 | } |
2338 | ||
2339 | /* | |
2340 | * Link filter bytecodes if not linked yet. | |
2341 | */ | |
a67ba386 MD |
2342 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2343 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2344 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2345 | |
2346 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2347 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2348 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2349 | &event_notifier_enabler->capture_bytecode_head); |
2350 | ||
a67ba386 | 2351 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2352 | } |
2353 | return 0; | |
2354 | } | |
2355 | ||
3c997079 MD |
2356 | /* |
2357 | * Called at module load: connect the probe on all enablers matching | |
2358 | * this event. | |
2359 | * Called with sessions lock held. | |
2360 | */ | |
2361 | int lttng_fix_pending_events(void) | |
2362 | { | |
2363 | struct lttng_session *session; | |
2364 | ||
2365 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2366 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2367 | return 0; |
2368 | } | |
2369 | ||
b01155ba FD |
2370 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2371 | struct lttng_event_notifier_group *event_notifier_group) | |
2372 | { | |
2373 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2374 | ||
2375 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2376 | node) { | |
2377 | if (event_notifier_enabler->base.enabled) | |
2378 | return true; | |
2379 | } | |
2380 | return false; | |
2381 | } | |
2382 | ||
2383 | bool lttng_event_notifier_active(void) | |
2384 | { | |
2385 | struct lttng_event_notifier_group *event_notifier_group; | |
2386 | ||
2387 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2388 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2389 | return true; | |
2390 | } | |
2391 | return false; | |
2392 | } | |
2393 | ||
2394 | int lttng_fix_pending_event_notifiers(void) | |
2395 | { | |
2396 | struct lttng_event_notifier_group *event_notifier_group; | |
2397 | ||
2398 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2399 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2400 | return 0; | |
2401 | } | |
2402 | ||
b2bc0bc8 FD |
2403 | struct lttng_event_enabler *lttng_event_enabler_create( |
2404 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2405 | struct lttng_kernel_abi_event *event_param, |
3c997079 MD |
2406 | struct lttng_channel *chan) |
2407 | { | |
b2bc0bc8 | 2408 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2409 | |
b2bc0bc8 FD |
2410 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2411 | if (!event_enabler) | |
3c997079 | 2412 | return NULL; |
b2bc0bc8 FD |
2413 | event_enabler->base.format_type = format_type; |
2414 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2415 | memcpy(&event_enabler->base.event_param, event_param, | |
2416 | sizeof(event_enabler->base.event_param)); | |
2417 | event_enabler->chan = chan; | |
3c997079 | 2418 | /* ctx left NULL */ |
b2bc0bc8 | 2419 | event_enabler->base.enabled = 0; |
3c997079 | 2420 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2421 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2422 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2423 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2424 | return event_enabler; |
3c997079 MD |
2425 | } |
2426 | ||
b2bc0bc8 | 2427 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2428 | { |
2429 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2430 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2431 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2432 | mutex_unlock(&sessions_mutex); |
2433 | return 0; | |
2434 | } | |
2435 | ||
b2bc0bc8 | 2436 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2437 | { |
2438 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2439 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2440 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2441 | mutex_unlock(&sessions_mutex); |
2442 | return 0; | |
2443 | } | |
2444 | ||
b2bc0bc8 | 2445 | static |
183e8b3a | 2446 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2447 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2448 | { |
89ec2b91 | 2449 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2450 | uint32_t bytecode_len; |
2451 | int ret; | |
2452 | ||
2453 | ret = get_user(bytecode_len, &bytecode->len); | |
2454 | if (ret) | |
2455 | return ret; | |
52cfcdf3 | 2456 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2457 | GFP_KERNEL); |
2458 | if (!bytecode_node) | |
2459 | return -ENOMEM; | |
2460 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2461 | sizeof(*bytecode) + bytecode_len); | |
2462 | if (ret) | |
2463 | goto error_free; | |
b2bc0bc8 | 2464 | |
89ec2b91 | 2465 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2466 | bytecode_node->enabler = enabler; |
2467 | /* Enforce length based on allocated size */ | |
2468 | bytecode_node->bc.len = bytecode_len; | |
2469 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2470 | |
07dfc1d0 MD |
2471 | return 0; |
2472 | ||
2473 | error_free: | |
52cfcdf3 | 2474 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2475 | return ret; |
2476 | } | |
2477 | ||
183e8b3a | 2478 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2479 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2480 | { |
2481 | int ret; | |
183e8b3a | 2482 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2483 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2484 | if (ret) | |
2485 | goto error; | |
2486 | ||
2487 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2488 | return 0; | |
2489 | ||
2490 | error: | |
2491 | return ret; | |
2492 | } | |
2493 | ||
e2d5dbc7 | 2494 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2495 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2496 | { |
2497 | ||
e2d5dbc7 | 2498 | switch (event->priv->instrumentation) { |
606828e4 | 2499 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2500 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2501 | default: |
2502 | return -EINVAL; | |
2503 | } | |
2504 | } | |
2505 | ||
3c997079 MD |
2506 | static |
2507 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2508 | { | |
89ec2b91 | 2509 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2510 | |
2511 | /* Destroy filter bytecode */ | |
2512 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2513 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2514 | lttng_kvfree(filter_node); |
07dfc1d0 | 2515 | } |
b2bc0bc8 FD |
2516 | } |
2517 | ||
2518 | static | |
2519 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2520 | { | |
2521 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2522 | |
b2bc0bc8 FD |
2523 | list_del(&event_enabler->node); |
2524 | kfree(event_enabler); | |
3c997079 MD |
2525 | } |
2526 | ||
dffef45d FD |
2527 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2528 | struct lttng_event_notifier_group *event_notifier_group, | |
2529 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2530 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2531 | { |
2532 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2533 | ||
2534 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2535 | if (!event_notifier_enabler) | |
2536 | return NULL; | |
2537 | ||
2538 | event_notifier_enabler->base.format_type = format_type; | |
2539 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2540 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2541 | ||
99f52fcc | 2542 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2543 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2544 | |
8a8ac9a8 FD |
2545 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2546 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2547 | |
2548 | event_notifier_enabler->base.enabled = 0; | |
2549 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2550 | event_notifier_enabler->group = event_notifier_group; | |
2551 | ||
2552 | mutex_lock(&sessions_mutex); | |
2553 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2554 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2555 | |
2556 | mutex_unlock(&sessions_mutex); | |
2557 | ||
2558 | return event_notifier_enabler; | |
2559 | } | |
2560 | ||
2561 | int lttng_event_notifier_enabler_enable( | |
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 = 1; | |
b01155ba | 2566 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2567 | mutex_unlock(&sessions_mutex); |
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | int lttng_event_notifier_enabler_disable( | |
2572 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2573 | { | |
2574 | mutex_lock(&sessions_mutex); | |
2575 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2576 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2577 | mutex_unlock(&sessions_mutex); |
2578 | return 0; | |
2579 | } | |
2580 | ||
183e8b3a | 2581 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2582 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2583 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2584 | { |
2585 | int ret; | |
2586 | ||
183e8b3a | 2587 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2588 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2589 | bytecode); | |
2590 | if (ret) | |
2591 | goto error; | |
2592 | ||
b01155ba | 2593 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2594 | return 0; |
2595 | ||
2596 | error: | |
2597 | return ret; | |
2598 | } | |
2599 | ||
99d223ad FD |
2600 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2601 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2602 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad FD |
2603 | { |
2604 | struct lttng_bytecode_node *bytecode_node; | |
2605 | struct lttng_enabler *enabler = | |
2606 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2607 | uint32_t bytecode_len; | |
2608 | int ret; | |
2609 | ||
2610 | ret = get_user(bytecode_len, &bytecode->len); | |
2611 | if (ret) | |
2612 | return ret; | |
2613 | ||
2614 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2615 | GFP_KERNEL); | |
2616 | if (!bytecode_node) | |
2617 | return -ENOMEM; | |
2618 | ||
2619 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2620 | sizeof(*bytecode) + bytecode_len); | |
2621 | if (ret) | |
2622 | goto error_free; | |
2623 | ||
2624 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2625 | bytecode_node->enabler = enabler; | |
2626 | ||
2627 | /* Enforce length based on allocated size */ | |
2628 | bytecode_node->bc.len = bytecode_len; | |
2629 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2630 | ||
2631 | event_notifier_enabler->num_captures++; | |
2632 | ||
2633 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2634 | goto end; | |
2635 | ||
2636 | error_free: | |
2637 | lttng_kvfree(bytecode_node); | |
2638 | end: | |
2639 | return ret; | |
2640 | } | |
2641 | ||
dffef45d FD |
2642 | static |
2643 | void lttng_event_notifier_enabler_destroy( | |
2644 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2645 | { | |
2646 | if (!event_notifier_enabler) { | |
2647 | return; | |
2648 | } | |
2649 | ||
2650 | list_del(&event_notifier_enabler->node); | |
2651 | ||
2652 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2653 | kfree(event_notifier_enabler); | |
2654 | } | |
2655 | ||
3c997079 | 2656 | /* |
b2bc0bc8 | 2657 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2658 | * session. |
2659 | * Should be called with sessions mutex held. | |
2660 | */ | |
2661 | static | |
b2bc0bc8 | 2662 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2663 | { |
b2bc0bc8 | 2664 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2665 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2666 | |
b2bc0bc8 FD |
2667 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2668 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2669 | /* |
2670 | * For each event, if at least one of its enablers is enabled, | |
2671 | * and its channel and session transient states are enabled, we | |
2672 | * enable the event, else we disable it. | |
2673 | */ | |
a67ba386 MD |
2674 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2675 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 | 2676 | struct lttng_enabler_ref *enabler_ref; |
07dfc1d0 | 2677 | struct lttng_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2678 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2679 | int nr_filters = 0; | |
3c997079 | 2680 | |
a67ba386 | 2681 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2682 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2683 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2684 | /* Enable events */ |
2685 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2686 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2687 | if (enabler_ref->ref->enabled) { |
2688 | enabled = 1; | |
2689 | break; | |
2690 | } | |
2691 | } | |
4ecb5ad5 | 2692 | break; |
b4a75708 | 2693 | |
4ecb5ad5 | 2694 | default: |
3c997079 MD |
2695 | /* Not handled with lazy sync. */ |
2696 | continue; | |
2697 | } | |
2698 | /* | |
2699 | * Enabled state is based on union of enablers, with | |
2700 | * intesection of session and channel transient enable | |
2701 | * states. | |
2702 | */ | |
a67ba386 | 2703 | enabled = enabled && session->tstate && event_recorder->chan->tstate; |
3c997079 | 2704 | |
a67ba386 | 2705 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2706 | /* |
2707 | * Sync tracepoint registration with event enabled | |
2708 | * state. | |
2709 | */ | |
2710 | if (enabled) { | |
a67ba386 | 2711 | register_event(event_recorder); |
3c997079 | 2712 | } else { |
a67ba386 | 2713 | _lttng_event_unregister(event_recorder); |
3c997079 | 2714 | } |
07dfc1d0 MD |
2715 | |
2716 | /* Check if has enablers without bytecode enabled */ | |
2717 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2718 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2719 | if (enabler_ref->ref->enabled |
2720 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2721 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2722 | break; |
2723 | } | |
2724 | } | |
a67ba386 | 2725 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2726 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2727 | |
2728 | /* Enable filters */ | |
2729 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2730 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
0b365677 | 2731 | lttng_bytecode_filter_sync_state(runtime); |
e2d5dbc7 MD |
2732 | nr_filters++; |
2733 | } | |
2734 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2735 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2736 | } |
2737 | } | |
2738 | ||
2739 | /* | |
2740 | * Apply enablers to session events, adding events to session if need | |
2741 | * be. It is required after each modification applied to an active | |
2742 | * session, and right before session "start". | |
2743 | * "lazy" sync means we only sync if required. | |
2744 | * Should be called with sessions mutex held. | |
2745 | */ | |
2746 | static | |
b2bc0bc8 | 2747 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2748 | { |
2749 | /* We can skip if session is not active */ | |
2750 | if (!session->active) | |
2751 | return; | |
b2bc0bc8 | 2752 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2753 | } |
2754 | ||
b01155ba FD |
2755 | static |
2756 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2757 | { | |
2758 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2759 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2760 | |
2761 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2762 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2763 | ||
2764 | /* | |
2765 | * For each event_notifier, if at least one of its enablers is enabled, | |
2766 | * we enable the event_notifier, else we disable it. | |
2767 | */ | |
a67ba386 MD |
2768 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2769 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2770 | struct lttng_enabler_ref *enabler_ref; |
2771 | struct lttng_bytecode_runtime *runtime; | |
e2d5dbc7 MD |
2772 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2773 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2774 | |
a67ba386 | 2775 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2776 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2777 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2778 | /* Enable event_notifiers */ |
2779 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2780 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2781 | if (enabler_ref->ref->enabled) { |
2782 | enabled = 1; | |
2783 | break; | |
2784 | } | |
2785 | } | |
2786 | break; | |
b4a75708 | 2787 | |
b01155ba FD |
2788 | default: |
2789 | /* Not handled with sync. */ | |
2790 | continue; | |
2791 | } | |
2792 | ||
a67ba386 | 2793 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2794 | /* |
2795 | * Sync tracepoint registration with event_notifier enabled | |
2796 | * state. | |
2797 | */ | |
2798 | if (enabled) { | |
a67ba386 | 2799 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2800 | register_event_notifier(event_notifier); |
2801 | } else { | |
a67ba386 | 2802 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2803 | _lttng_event_notifier_unregister(event_notifier); |
2804 | } | |
2805 | ||
2806 | /* Check if has enablers without bytecode enabled */ | |
2807 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2808 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2809 | if (enabler_ref->ref->enabled |
2810 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2811 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2812 | break; |
2813 | } | |
2814 | } | |
a67ba386 | 2815 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2816 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2817 | |
2818 | /* Enable filters */ | |
2819 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2820 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
0b365677 | 2821 | lttng_bytecode_filter_sync_state(runtime); |
e2d5dbc7 MD |
2822 | nr_filters++; |
2823 | } | |
2824 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2825 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2826 | |
2827 | /* Enable captures */ | |
2828 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2829 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
99d223ad | 2830 | lttng_bytecode_capture_sync_state(runtime); |
e2d5dbc7 MD |
2831 | nr_captures++; |
2832 | } | |
2833 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2834 | } |
2835 | } | |
2836 | ||
1ec3f75a | 2837 | /* |
d83004aa JD |
2838 | * Serialize at most one packet worth of metadata into a metadata |
2839 | * channel. | |
92d9f5e6 MD |
2840 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2841 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2842 | * allows us to do racy operations such as looking for remaining space left in | |
2843 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2844 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2845 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2846 | * Returns the number of bytes written in the channel, 0 if no data |
2847 | * was written and a negative value on error. | |
1ec3f75a | 2848 | */ |
b3b8072b | 2849 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2850 | struct channel *chan, bool *coherent) |
d83004aa JD |
2851 | { |
2852 | struct lib_ring_buffer_ctx ctx; | |
2853 | int ret = 0; | |
2854 | size_t len, reserve_len; | |
2855 | ||
f613e3e6 | 2856 | /* |
92d9f5e6 MD |
2857 | * Ensure we support mutiple get_next / put sequences followed by |
2858 | * put_next. The metadata cache lock protects reading the metadata | |
2859 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2860 | * "flush" operations on the buffer invoked by different processes. | |
2861 | * Moreover, since the metadata cache memory can be reallocated, we | |
2862 | * need to have exclusive access against updates even though we only | |
2863 | * read it. | |
f613e3e6 | 2864 | */ |
92d9f5e6 | 2865 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2866 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2867 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2868 | goto end; |
f613e3e6 | 2869 | |
9616f0bf JD |
2870 | /* Metadata regenerated, change the version. */ |
2871 | if (stream->metadata_cache->version != stream->version) | |
2872 | stream->version = stream->metadata_cache->version; | |
2873 | ||
d83004aa | 2874 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2875 | stream->metadata_in; |
9de2c215 | 2876 | if (!len) |
de23d59d | 2877 | goto end; |
d83004aa | 2878 | reserve_len = min_t(size_t, |
b3b8072b | 2879 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2880 | len); |
a775608d MD |
2881 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
2882 | sizeof(char), -1, NULL); | |
d83004aa JD |
2883 | /* |
2884 | * If reservation failed, return an error to the caller. | |
2885 | */ | |
b3b8072b | 2886 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2887 | if (ret != 0) { |
2888 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2889 | stream->coherent = false; |
d83004aa JD |
2890 | goto end; |
2891 | } | |
b3b8072b | 2892 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2893 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2894 | reserve_len); |
b3b8072b | 2895 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2896 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2897 | if (reserve_len < len) |
8b97fd42 MD |
2898 | stream->coherent = false; |
2899 | else | |
2900 | stream->coherent = true; | |
d83004aa JD |
2901 | ret = reserve_len; |
2902 | ||
2903 | end: | |
8b97fd42 MD |
2904 | if (coherent) |
2905 | *coherent = stream->coherent; | |
92d9f5e6 | 2906 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2907 | return ret; |
2908 | } | |
2909 | ||
8b97fd42 MD |
2910 | static |
2911 | void lttng_metadata_begin(struct lttng_session *session) | |
2912 | { | |
3e75e2a7 MD |
2913 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2914 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2915 | } |
2916 | ||
2917 | static | |
2918 | void lttng_metadata_end(struct lttng_session *session) | |
2919 | { | |
3e75e2a7 MD |
2920 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2921 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2922 | struct lttng_metadata_stream *stream; | |
2923 | ||
3e75e2a7 MD |
2924 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2925 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2926 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2927 | } |
8b97fd42 MD |
2928 | } |
2929 | ||
d83004aa JD |
2930 | /* |
2931 | * Write the metadata to the metadata cache. | |
2932 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2933 | * The metadata cache lock protects us from concurrent read access from |
2934 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2935 | * The content of the printf is printed as a single atomic metadata |
2936 | * transaction. | |
d83004aa | 2937 | */ |
a90917c3 | 2938 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2939 | const char *fmt, ...) |
2940 | { | |
c099397a | 2941 | char *str; |
d83004aa | 2942 | size_t len; |
c099397a MD |
2943 | va_list ap; |
2944 | ||
585e5dcc | 2945 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2946 | |
2947 | va_start(ap, fmt); | |
2948 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2949 | va_end(ap); | |
2950 | if (!str) | |
2951 | return -ENOMEM; | |
2952 | ||
1ec3f75a | 2953 | len = strlen(str); |
3e75e2a7 | 2954 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2955 | if (session->metadata_cache->metadata_written + len > |
2956 | session->metadata_cache->cache_alloc) { | |
2957 | char *tmp_cache_realloc; | |
2958 | unsigned int tmp_cache_alloc_size; | |
2959 | ||
2960 | tmp_cache_alloc_size = max_t(unsigned int, | |
2961 | session->metadata_cache->cache_alloc + len, | |
2962 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2963 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2964 | if (!tmp_cache_realloc) |
2965 | goto err; | |
a606b6e8 ML |
2966 | if (session->metadata_cache->data) { |
2967 | memcpy(tmp_cache_realloc, | |
2968 | session->metadata_cache->data, | |
2969 | session->metadata_cache->cache_alloc); | |
2970 | vfree(session->metadata_cache->data); | |
2971 | } | |
2972 | ||
d83004aa JD |
2973 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2974 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2975 | } |
d83004aa JD |
2976 | memcpy(session->metadata_cache->data + |
2977 | session->metadata_cache->metadata_written, | |
2978 | str, len); | |
2979 | session->metadata_cache->metadata_written += len; | |
c099397a | 2980 | kfree(str); |
d83004aa | 2981 | |
d83004aa JD |
2982 | return 0; |
2983 | ||
2984 | err: | |
2985 | kfree(str); | |
2986 | return -ENOMEM; | |
c099397a MD |
2987 | } |
2988 | ||
f513b2bf MD |
2989 | static |
2990 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2991 | { | |
2992 | size_t i; | |
2993 | ||
2994 | for (i = 0; i < nesting; i++) { | |
2995 | int ret; | |
2996 | ||
2997 | ret = lttng_metadata_printf(session, " "); | |
2998 | if (ret) { | |
2999 | return ret; | |
3000 | } | |
3001 | } | |
3002 | return 0; | |
3003 | } | |
3004 | ||
ceabb767 MD |
3005 | static |
3006 | int lttng_field_name_statedump(struct lttng_session *session, | |
437d5aa5 | 3007 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3008 | size_t nesting) |
3009 | { | |
3010 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3011 | } | |
3012 | ||
3013 | static | |
3014 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3015 | const struct lttng_kernel_type_integer *type, |
3016 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3017 | size_t nesting) |
3018 | { | |
3019 | int ret; | |
3020 | ||
ceabb767 MD |
3021 | ret = print_tabs(session, nesting); |
3022 | if (ret) | |
3023 | return ret; | |
3024 | ret = lttng_metadata_printf(session, | |
3025 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3026 | type->size, |
3027 | type->alignment, | |
3028 | type->signedness, | |
3029 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3030 | ? "none" |
437d5aa5 | 3031 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3032 | ? "UTF8" |
3033 | : "ASCII", | |
437d5aa5 | 3034 | type->base, |
ceabb767 | 3035 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3036 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3037 | #else |
437d5aa5 | 3038 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3039 | #endif |
3040 | ); | |
3041 | return ret; | |
3042 | } | |
3043 | ||
f513b2bf MD |
3044 | /* |
3045 | * Must be called with sessions_mutex held. | |
3046 | */ | |
3047 | static | |
3048 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3049 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3050 | size_t nesting) |
3051 | { | |
3052 | int ret; | |
3053 | uint32_t i, nr_fields; | |
ceabb767 MD |
3054 | unsigned int alignment; |
3055 | ||
f513b2bf MD |
3056 | ret = print_tabs(session, nesting); |
3057 | if (ret) | |
3058 | return ret; | |
3059 | ret = lttng_metadata_printf(session, | |
3060 | "struct {\n"); | |
3061 | if (ret) | |
3062 | return ret; | |
437d5aa5 | 3063 | nr_fields = type->nr_fields; |
f513b2bf | 3064 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3065 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3066 | |
437d5aa5 | 3067 | iter_field = type->fields[i]; |
f513b2bf MD |
3068 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3069 | if (ret) | |
3070 | return ret; | |
3071 | } | |
3072 | ret = print_tabs(session, nesting); | |
3073 | if (ret) | |
3074 | return ret; | |
437d5aa5 | 3075 | alignment = type->alignment; |
ceabb767 MD |
3076 | if (alignment) { |
3077 | ret = lttng_metadata_printf(session, | |
3078 | "} align(%u)", | |
3079 | alignment); | |
3080 | } else { | |
3081 | ret = lttng_metadata_printf(session, | |
3082 | "}"); | |
3083 | } | |
f513b2bf MD |
3084 | return ret; |
3085 | } | |
3086 | ||
3087 | /* | |
3088 | * Must be called with sessions_mutex held. | |
3089 | */ | |
3090 | static | |
ceabb767 | 3091 | int _lttng_struct_field_statedump(struct lttng_session *session, |
437d5aa5 | 3092 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3093 | size_t nesting) |
3094 | { | |
3095 | int ret; | |
3096 | ||
3097 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3098 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3099 | if (ret) |
3100 | return ret; | |
ceabb767 | 3101 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3102 | } |
3103 | ||
65c85aa6 MD |
3104 | /* |
3105 | * Must be called with sessions_mutex held. | |
3106 | */ | |
3107 | static | |
3108 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3109 | const struct lttng_kernel_type_variant *type, |
65c85aa6 MD |
3110 | size_t nesting) |
3111 | { | |
3112 | int ret; | |
3113 | uint32_t i, nr_choices; | |
3114 | ||
ceabb767 MD |
3115 | /* |
3116 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3117 | */ | |
437d5aa5 | 3118 | if (type->alignment != 0) |
ceabb767 | 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", | |
437d5aa5 | 3125 | type->tag_name); |
65c85aa6 MD |
3126 | if (ret) |
3127 | return ret; | |
437d5aa5 | 3128 | nr_choices = type->nr_choices; |
65c85aa6 | 3129 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3130 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3131 | |
437d5aa5 | 3132 | iter_field = type->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, |
437d5aa5 | 3150 | const struct lttng_kernel_event_field *field, |
65c85aa6 MD |
3151 | size_t nesting) |
3152 | { | |
3153 | int ret; | |
3154 | ||
3155 | ret = _lttng_variant_type_statedump(session, | |
437d5aa5 | 3156 | lttng_kernel_get_type_variant(field->type), nesting); |
65c85aa6 MD |
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, |
437d5aa5 | 3167 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3168 | size_t nesting) |
3169 | { | |
3170 | int ret; | |
437d5aa5 MD |
3171 | const struct lttng_kernel_type_array *array_type; |
3172 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3173 | |
437d5aa5 MD |
3174 | array_type = lttng_kernel_get_type_array(field->type); |
3175 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3176 | |
437d5aa5 | 3177 | if (array_type->alignment) { |
ceabb767 | 3178 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3179 | if (ret) |
3180 | return ret; | |
ceabb767 MD |
3181 | ret = lttng_metadata_printf(session, |
3182 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3183 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3184 | field->name); |
3185 | if (ret) | |
3186 | return ret; | |
3187 | } | |
3188 | /* | |
3189 | * Nested compound types: Only array of structures and variants are | |
3190 | * currently supported. | |
3191 | */ | |
437d5aa5 | 3192 | elem_type = array_type->elem_type; |
12bb2edb MD |
3193 | switch (elem_type->type) { |
3194 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3195 | case lttng_kernel_type_struct: |
3196 | case lttng_kernel_type_variant: | |
3197 | ret = _lttng_type_statedump(session, elem_type, | |
3198 | array_type->encoding, nesting); | |
65c85aa6 MD |
3199 | if (ret) |
3200 | return ret; | |
3201 | break; | |
ceabb767 | 3202 | |
f513b2bf MD |
3203 | default: |
3204 | return -EINVAL; | |
3205 | } | |
3206 | ret = lttng_metadata_printf(session, | |
3207 | " _%s[%u];\n", | |
3208 | field->name, | |
437d5aa5 | 3209 | array_type->length); |
f513b2bf MD |
3210 | return ret; |
3211 | } | |
3212 | ||
3213 | /* | |
3214 | * Must be called with sessions_mutex held. | |
3215 | */ | |
3216 | static | |
ceabb767 | 3217 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
437d5aa5 | 3218 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3219 | size_t nesting) |
3220 | { | |
3221 | int ret; | |
3222 | const char *length_name; | |
437d5aa5 MD |
3223 | const struct lttng_kernel_type_sequence *sequence_type; |
3224 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3225 | |
437d5aa5 MD |
3226 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3227 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3228 | |
437d5aa5 | 3229 | length_name = sequence_type->length_name; |
ceabb767 | 3230 | |
437d5aa5 | 3231 | if (sequence_type->alignment) { |
ceabb767 | 3232 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3233 | if (ret) |
3234 | return ret; | |
ceabb767 MD |
3235 | ret = lttng_metadata_printf(session, |
3236 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3237 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3238 | field->name); |
3239 | if (ret) | |
3240 | return ret; | |
3241 | } | |
3242 | ||
3243 | /* | |
3244 | * Nested compound types: Only array of structures and variants are | |
3245 | * currently supported. | |
3246 | */ | |
437d5aa5 | 3247 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3248 | switch (elem_type->type) { |
3249 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3250 | case lttng_kernel_type_struct: |
3251 | case lttng_kernel_type_variant: | |
3252 | ret = _lttng_type_statedump(session, elem_type, | |
3253 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3254 | if (ret) |
3255 | return ret; | |
3256 | break; | |
ceabb767 | 3257 | |
f513b2bf MD |
3258 | default: |
3259 | return -EINVAL; | |
3260 | } | |
3261 | ret = lttng_metadata_printf(session, | |
3262 | " _%s[ _%s ];\n", | |
3263 | field->name, | |
437d5aa5 | 3264 | sequence_type->length_name); |
f513b2bf MD |
3265 | return ret; |
3266 | } | |
3267 | ||
141ddf28 MD |
3268 | /* |
3269 | * Must be called with sessions_mutex held. | |
3270 | */ | |
3271 | static | |
ceabb767 | 3272 | int _lttng_enum_type_statedump(struct lttng_session *session, |
437d5aa5 | 3273 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3274 | size_t nesting) |
3275 | { | |
d96a4a7a | 3276 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3277 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3278 | int ret; |
3279 | unsigned int i, nr_entries; | |
3280 | ||
437d5aa5 | 3281 | container_type = type->container_type; |
12bb2edb | 3282 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3283 | ret = -EINVAL; |
3284 | goto end; | |
3285 | } | |
437d5aa5 | 3286 | enum_desc = type->desc; |
141ddf28 MD |
3287 | nr_entries = enum_desc->nr_entries; |
3288 | ||
3289 | ret = print_tabs(session, nesting); | |
3290 | if (ret) | |
3291 | goto end; | |
ceabb767 MD |
3292 | ret = lttng_metadata_printf(session, "enum : "); |
3293 | if (ret) | |
3294 | goto end; | |
437d5aa5 MD |
3295 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3296 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3297 | if (ret) |
ceabb767 MD |
3298 | goto end; |
3299 | ret = lttng_metadata_printf(session, " {\n"); | |
3300 | if (ret) | |
3301 | goto end; | |
141ddf28 MD |
3302 | /* Dump all entries */ |
3303 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3304 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3305 | int j, len; |
3306 | ||
3307 | ret = print_tabs(session, nesting + 1); | |
3308 | if (ret) | |
3309 | goto end; | |
3310 | ret = lttng_metadata_printf(session, | |
3311 | "\""); | |
3312 | if (ret) | |
3313 | goto end; | |
3314 | len = strlen(entry->string); | |
3315 | /* Escape the character '"' */ | |
3316 | for (j = 0; j < len; j++) { | |
3317 | char c = entry->string[j]; | |
3318 | ||
3319 | switch (c) { | |
3320 | case '"': | |
3321 | ret = lttng_metadata_printf(session, | |
3322 | "\\\""); | |
3323 | break; | |
3324 | case '\\': | |
3325 | ret = lttng_metadata_printf(session, | |
3326 | "\\\\"); | |
3327 | break; | |
3328 | default: | |
3329 | ret = lttng_metadata_printf(session, | |
3330 | "%c", c); | |
3331 | break; | |
3332 | } | |
3333 | if (ret) | |
3334 | goto end; | |
3335 | } | |
08ad1061 PP |
3336 | ret = lttng_metadata_printf(session, "\""); |
3337 | if (ret) | |
3338 | goto end; | |
3339 | ||
3340 | if (entry->options.is_auto) { | |
3341 | ret = lttng_metadata_printf(session, ",\n"); | |
3342 | if (ret) | |
3343 | goto end; | |
141ddf28 | 3344 | } else { |
7c559490 MD |
3345 | ret = lttng_metadata_printf(session, |
3346 | " = "); | |
3347 | if (ret) | |
3348 | goto end; | |
3349 | if (entry->start.signedness) | |
141ddf28 | 3350 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3351 | "%lld", (long long) entry->start.value); |
3352 | else | |
3353 | ret = lttng_metadata_printf(session, | |
3354 | "%llu", entry->start.value); | |
3355 | if (ret) | |
3356 | goto end; | |
3357 | if (entry->start.signedness == entry->end.signedness && | |
3358 | entry->start.value | |
3359 | == entry->end.value) { | |
141ddf28 | 3360 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3361 | ",\n"); |
3362 | } else { | |
3363 | if (entry->end.signedness) { | |
3364 | ret = lttng_metadata_printf(session, | |
3365 | " ... %lld,\n", | |
3366 | (long long) entry->end.value); | |
3367 | } else { | |
3368 | ret = lttng_metadata_printf(session, | |
3369 | " ... %llu,\n", | |
3370 | entry->end.value); | |
3371 | } | |
141ddf28 | 3372 | } |
7c559490 MD |
3373 | if (ret) |
3374 | goto end; | |
141ddf28 | 3375 | } |
141ddf28 MD |
3376 | } |
3377 | ret = print_tabs(session, nesting); | |
3378 | if (ret) | |
3379 | goto end; | |
ceabb767 | 3380 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3381 | end: |
3382 | return ret; | |
3383 | } | |
3384 | ||
d83004aa JD |
3385 | /* |
3386 | * Must be called with sessions_mutex held. | |
3387 | */ | |
c099397a | 3388 | static |
ceabb767 | 3389 | int _lttng_enum_field_statedump(struct lttng_session *session, |
437d5aa5 | 3390 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3391 | size_t nesting) |
3392 | { | |
3393 | int ret; | |
437d5aa5 | 3394 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3395 | |
437d5aa5 MD |
3396 | enum_type = lttng_kernel_get_type_enum(field->type); |
3397 | WARN_ON_ONCE(!enum_type); | |
3398 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3399 | if (ret) |
3400 | return ret; | |
3401 | return lttng_field_name_statedump(session, field, nesting); | |
3402 | } | |
3403 | ||
3404 | static | |
3405 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3406 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3407 | size_t nesting) |
3408 | { | |
3409 | int ret; | |
3410 | ||
437d5aa5 MD |
3411 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3412 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3413 | if (ret) |
3414 | return ret; | |
3415 | return lttng_field_name_statedump(session, field, nesting); | |
3416 | } | |
3417 | ||
3418 | static | |
3419 | int _lttng_string_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3420 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3421 | size_t nesting) |
3422 | { | |
3423 | int ret; | |
3424 | ||
ceabb767 MD |
3425 | /* Default encoding is UTF8 */ |
3426 | ret = print_tabs(session, nesting); | |
3427 | if (ret) | |
3428 | return ret; | |
3429 | ret = lttng_metadata_printf(session, | |
3430 | "string%s", | |
437d5aa5 | 3431 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3432 | " { encoding = ASCII; }" : ""); |
3433 | return ret; | |
3434 | } | |
3435 | ||
3436 | static | |
3437 | int _lttng_string_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3438 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3439 | size_t nesting) |
ceabb767 | 3440 | { |
437d5aa5 | 3441 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3442 | int ret; |
3443 | ||
437d5aa5 MD |
3444 | string_type = lttng_kernel_get_type_string(field->type); |
3445 | WARN_ON_ONCE(!string_type); | |
3446 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3447 | if (ret) |
3448 | return ret; | |
3449 | return lttng_field_name_statedump(session, field, nesting); | |
3450 | } | |
3451 | ||
3452 | /* | |
3453 | * Must be called with sessions_mutex held. | |
3454 | */ | |
3455 | static | |
3456 | int _lttng_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3457 | const struct lttng_kernel_type_common *type, |
3458 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3459 | size_t nesting) |
c099397a | 3460 | { |
c099397a | 3461 | int ret = 0; |
c099397a | 3462 | |
12bb2edb MD |
3463 | switch (type->type) { |
3464 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3465 | ret = _lttng_integer_type_statedump(session, |
3466 | lttng_kernel_get_type_integer(type), | |
3467 | parent_encoding, nesting); | |
8070f5c0 | 3468 | break; |
437d5aa5 MD |
3469 | case lttng_kernel_type_enum: |
3470 | ret = _lttng_enum_type_statedump(session, | |
3471 | lttng_kernel_get_type_enum(type), | |
3472 | nesting); | |
8070f5c0 | 3473 | break; |
12bb2edb | 3474 | case lttng_kernel_type_string: |
437d5aa5 MD |
3475 | ret = _lttng_string_type_statedump(session, |
3476 | lttng_kernel_get_type_string(type), | |
3477 | nesting); | |
ceabb767 | 3478 | break; |
437d5aa5 MD |
3479 | case lttng_kernel_type_struct: |
3480 | ret = _lttng_struct_type_statedump(session, | |
3481 | lttng_kernel_get_type_struct(type), | |
3482 | nesting); | |
8070f5c0 | 3483 | break; |
437d5aa5 MD |
3484 | case lttng_kernel_type_variant: |
3485 | ret = _lttng_variant_type_statedump(session, | |
3486 | lttng_kernel_get_type_variant(type), | |
3487 | nesting); | |
ceabb767 MD |
3488 | break; |
3489 | ||
3490 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3491 | case lttng_kernel_type_array: |
3492 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3493 | default: |
3494 | WARN_ON_ONCE(1); | |
3495 | return -EINVAL; | |
8070f5c0 | 3496 | } |
ceabb767 MD |
3497 | return ret; |
3498 | } | |
8070f5c0 | 3499 | |
ceabb767 MD |
3500 | /* |
3501 | * Must be called with sessions_mutex held. | |
3502 | */ | |
3503 | static | |
3504 | int _lttng_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3505 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3506 | size_t nesting) |
3507 | { | |
3508 | int ret = 0; | |
27d2368e | 3509 | |
437d5aa5 | 3510 | switch (field->type->type) { |
12bb2edb | 3511 | case lttng_kernel_type_integer: |
ceabb767 MD |
3512 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3513 | break; | |
437d5aa5 | 3514 | case lttng_kernel_type_enum: |
ceabb767 | 3515 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3516 | break; |
12bb2edb | 3517 | case lttng_kernel_type_string: |
ceabb767 | 3518 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3519 | break; |
437d5aa5 | 3520 | case lttng_kernel_type_struct: |
ceabb767 | 3521 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3522 | break; |
437d5aa5 | 3523 | case lttng_kernel_type_array: |
ceabb767 | 3524 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3525 | break; |
437d5aa5 | 3526 | case lttng_kernel_type_sequence: |
ceabb767 | 3527 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3528 | break; |
437d5aa5 | 3529 | case lttng_kernel_type_variant: |
ceabb767 | 3530 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3531 | break; |
f513b2bf | 3532 | |
8070f5c0 MD |
3533 | default: |
3534 | WARN_ON_ONCE(1); | |
3535 | return -EINVAL; | |
3536 | } | |
3537 | return ret; | |
3538 | } | |
3539 | ||
3540 | static | |
a90917c3 | 3541 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
437d5aa5 | 3542 | struct lttng_kernel_ctx *ctx) |
8070f5c0 MD |
3543 | { |
3544 | int ret = 0; | |
3545 | int i; | |
3546 | ||
3547 | if (!ctx) | |
3548 | return 0; | |
3549 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3550 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3551 | |
437d5aa5 | 3552 | ret = _lttng_field_statedump(session, field->event_field, 2); |
8070f5c0 MD |
3553 | if (ret) |
3554 | return ret; | |
3555 | } | |
3556 | return ret; | |
3557 | } | |
3558 | ||
3559 | static | |
a90917c3 | 3560 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
a67ba386 | 3561 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3562 | { |
a67ba386 | 3563 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3564 | int ret = 0; |
3565 | int i; | |
3566 | ||
3567 | for (i = 0; i < desc->nr_fields; i++) { | |
437d5aa5 | 3568 | const struct lttng_kernel_event_field *field = desc->fields[i]; |
8070f5c0 | 3569 | |
f513b2bf | 3570 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3571 | if (ret) |
3572 | return ret; | |
c099397a MD |
3573 | } |
3574 | return ret; | |
3575 | } | |
3576 | ||
d83004aa JD |
3577 | /* |
3578 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3579 | * The entire event metadata is printed as a single atomic metadata |
3580 | * transaction. | |
d83004aa | 3581 | */ |
c099397a | 3582 | static |
a90917c3 MD |
3583 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3584 | struct lttng_channel *chan, | |
a67ba386 | 3585 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3586 | { |
3587 | int ret = 0; | |
3588 | ||
a67ba386 | 3589 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3590 | return 0; |
d83004aa | 3591 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3592 | return 0; |
3593 | ||
8b97fd42 MD |
3594 | lttng_metadata_begin(session); |
3595 | ||
c099397a MD |
3596 | ret = lttng_metadata_printf(session, |
3597 | "event {\n" | |
ae734547 | 3598 | " name = \"%s\";\n" |
c099397a | 3599 | " id = %u;\n" |
b9074a1b | 3600 | " stream_id = %u;\n", |
a67ba386 MD |
3601 | event_recorder->priv->parent.desc->event_name, |
3602 | event_recorder->priv->id, | |
3603 | event_recorder->chan->id); | |
c099397a MD |
3604 | if (ret) |
3605 | goto end; | |
3606 | ||
8070f5c0 | 3607 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3608 | " fields := struct {\n" |
3609 | ); | |
3610 | if (ret) | |
3611 | goto end; | |
3612 | ||
a67ba386 | 3613 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3614 | if (ret) |
3615 | goto end; | |
3616 | ||
3617 | /* | |
3618 | * LTTng space reservation can only reserve multiples of the | |
3619 | * byte size. | |
3620 | */ | |
3621 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3622 | " };\n" |
3623 | "};\n\n"); | |
c099397a MD |
3624 | if (ret) |
3625 | goto end; | |
3626 | ||
a67ba386 | 3627 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3628 | end: |
8b97fd42 | 3629 | lttng_metadata_end(session); |
c099397a MD |
3630 | return ret; |
3631 | ||
3632 | } | |
3633 | ||
d83004aa JD |
3634 | /* |
3635 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3636 | * The entire channel metadata is printed as a single atomic metadata |
3637 | * transaction. | |
d83004aa | 3638 | */ |
c099397a | 3639 | static |
a90917c3 MD |
3640 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3641 | struct lttng_channel *chan) | |
c099397a MD |
3642 | { |
3643 | int ret = 0; | |
3644 | ||
585e5dcc | 3645 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3646 | return 0; |
d83004aa JD |
3647 | |
3648 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3649 | return 0; |
3650 | ||
8b97fd42 MD |
3651 | lttng_metadata_begin(session); |
3652 | ||
c099397a MD |
3653 | WARN_ON_ONCE(!chan->header_type); |
3654 | ret = lttng_metadata_printf(session, | |
3655 | "stream {\n" | |
3656 | " id = %u;\n" | |
9115fbdc | 3657 | " event.header := %s;\n" |
b9074a1b | 3658 | " packet.context := struct packet_context;\n", |
c099397a MD |
3659 | chan->id, |
3660 | chan->header_type == 1 ? "struct event_header_compact" : | |
3661 | "struct event_header_large"); | |
3662 | if (ret) | |
3663 | goto end; | |
3664 | ||
b9074a1b MD |
3665 | if (chan->ctx) { |
3666 | ret = lttng_metadata_printf(session, | |
3667 | " event.context := struct {\n"); | |
3668 | if (ret) | |
3669 | goto end; | |
3670 | } | |
a90917c3 | 3671 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3672 | if (ret) |
3673 | goto end; | |
b9074a1b MD |
3674 | if (chan->ctx) { |
3675 | ret = lttng_metadata_printf(session, | |
3676 | " };\n"); | |
3677 | if (ret) | |
3678 | goto end; | |
3679 | } | |
8070f5c0 MD |
3680 | |
3681 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3682 | "};\n\n"); |
8070f5c0 | 3683 | |
c099397a MD |
3684 | chan->metadata_dumped = 1; |
3685 | end: | |
8b97fd42 | 3686 | lttng_metadata_end(session); |
c099397a MD |
3687 | return ret; |
3688 | } | |
3689 | ||
d83004aa JD |
3690 | /* |
3691 | * Must be called with sessions_mutex held. | |
3692 | */ | |
9115fbdc | 3693 | static |
a90917c3 | 3694 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3695 | { |
3696 | return lttng_metadata_printf(session, | |
3697 | "struct packet_context {\n" | |
a3ccff4f MD |
3698 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3699 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3700 | " uint64_t content_size;\n" |
3701 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3702 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3703 | " unsigned long events_discarded;\n" |
9115fbdc | 3704 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3705 | "};\n\n" |
9115fbdc MD |
3706 | ); |
3707 | } | |
3708 | ||
3709 | /* | |
3710 | * Compact header: | |
3711 | * id: range: 0 - 30. | |
3712 | * id 31 is reserved to indicate an extended header. | |
3713 | * | |
3714 | * Large header: | |
3715 | * id: range: 0 - 65534. | |
3716 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3717 | * |
3718 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3719 | */ |
3720 | static | |
a90917c3 | 3721 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3722 | { |
3723 | return lttng_metadata_printf(session, | |
3724 | "struct event_header_compact {\n" | |
3725 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3726 | " variant <id> {\n" | |
3727 | " struct {\n" | |
a3ccff4f | 3728 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3729 | " } compact;\n" |
3730 | " struct {\n" | |
3731 | " uint32_t id;\n" | |
a3ccff4f | 3732 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3733 | " } extended;\n" |
3734 | " } v;\n" | |
3735 | "} align(%u);\n" | |
3736 | "\n" | |
3737 | "struct event_header_large {\n" | |
3738 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3739 | " variant <id> {\n" | |
3740 | " struct {\n" | |
a3ccff4f | 3741 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3742 | " } compact;\n" |
3743 | " struct {\n" | |
3744 | " uint32_t id;\n" | |
a3ccff4f | 3745 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3746 | " } extended;\n" |
3747 | " } v;\n" | |
3748 | "} align(%u);\n\n", | |
a90917c3 MD |
3749 | lttng_alignof(uint32_t) * CHAR_BIT, |
3750 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3751 | ); |
3752 | } | |
3753 | ||
a3ccff4f MD |
3754 | /* |
3755 | * Approximation of NTP time of day to clock monotonic correlation, | |
3756 | * taken at start of trace. | |
3757 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3758 | * in future versions. | |
5283350b MD |
3759 | * This function may return a negative offset. It may happen if the |
3760 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3761 | * |
3762 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3763 | * y2038 compliant. | |
a3ccff4f MD |
3764 | */ |
3765 | static | |
8967b2a3 | 3766 | int64_t measure_clock_offset(void) |
a3ccff4f | 3767 | { |
dcb93448 | 3768 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3769 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3770 | int64_t offset; |
a3ccff4f | 3771 | unsigned long flags; |
3636085f MJ |
3772 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3773 | struct timespec64 rts = { 0, 0 }; | |
3774 | #else | |
3775 | struct timespec rts = { 0, 0 }; | |
3776 | #endif | |
a3ccff4f MD |
3777 | |
3778 | /* Disable interrupts to increase correlation precision. */ | |
3779 | local_irq_save(flags); | |
3780 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3781 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3782 | ktime_get_real_ts64(&rts); | |
3783 | #else | |
216b6baa | 3784 | getnstimeofday(&rts); |
3636085f | 3785 | #endif |
a3ccff4f MD |
3786 | monotonic[1] = trace_clock_read64(); |
3787 | local_irq_restore(flags); | |
3788 | ||
dcb93448 | 3789 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3790 | realtime = (uint64_t) rts.tv_sec * tcf; |
3791 | if (tcf == NSEC_PER_SEC) { | |
3792 | realtime += rts.tv_nsec; | |
3793 | } else { | |
3794 | uint64_t n = rts.tv_nsec * tcf; | |
3795 | ||
3796 | do_div(n, NSEC_PER_SEC); | |
3797 | realtime += n; | |
3798 | } | |
dcb93448 | 3799 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3800 | return offset; |
3801 | } | |
3802 | ||
3eb95be4 JR |
3803 | static |
3804 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3805 | { | |
0f3eaad4 | 3806 | int ret = 0; |
3eb95be4 JR |
3807 | size_t i; |
3808 | char cur; | |
3809 | ||
3810 | i = 0; | |
3811 | cur = string[i]; | |
3812 | while (cur != '\0') { | |
3813 | switch (cur) { | |
3814 | case '\n': | |
3815 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3816 | break; | |
3817 | case '\\': | |
3818 | case '"': | |
3819 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3820 | if (ret) | |
3821 | goto error; | |
3822 | /* We still print the current char */ | |
3823 | /* Fallthrough */ | |
3824 | default: | |
3825 | ret = lttng_metadata_printf(session, "%c", cur); | |
3826 | break; | |
3827 | } | |
3828 | ||
3829 | if (ret) | |
3830 | goto error; | |
3831 | ||
3832 | cur = string[++i]; | |
3833 | } | |
3834 | error: | |
3835 | return ret; | |
3836 | } | |
3837 | ||
3838 | static | |
1c88f269 JR |
3839 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3840 | const char *field_value) | |
3eb95be4 JR |
3841 | { |
3842 | int ret; | |
3843 | ||
1c88f269 | 3844 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3845 | if (ret) |
3846 | goto error; | |
3847 | ||
1c88f269 | 3848 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3849 | if (ret) |
3850 | goto error; | |
3851 | ||
3852 | ret = lttng_metadata_printf(session, "\";\n"); | |
3853 | ||
3854 | error: | |
3855 | return ret; | |
3856 | } | |
3857 | ||
c099397a MD |
3858 | /* |
3859 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3860 | * Must be called with sessions_mutex held. |
c099397a MD |
3861 | */ |
3862 | static | |
a90917c3 | 3863 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3864 | { |
30bdb6e4 | 3865 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3866 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3867 | const char *product_uuid; |
a90917c3 | 3868 | struct lttng_channel *chan; |
a67ba386 | 3869 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3870 | int ret = 0; |
3871 | ||
585e5dcc | 3872 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3873 | return 0; |
8b97fd42 MD |
3874 | |
3875 | lttng_metadata_begin(session); | |
3876 | ||
c099397a MD |
3877 | if (session->metadata_dumped) |
3878 | goto skip_session; | |
c099397a | 3879 | |
d793d5e1 | 3880 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3881 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3882 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3883 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3884 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3885 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3886 | |
3887 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3888 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3889 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3890 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3891 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3892 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3893 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3894 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3895 | "\n" |
3896 | "trace {\n" | |
3897 | " major = %u;\n" | |
3898 | " minor = %u;\n" | |
30bdb6e4 | 3899 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3900 | " byte_order = %s;\n" |
3901 | " packet.header := struct {\n" | |
3902 | " uint32_t magic;\n" | |
1ec3f75a | 3903 | " uint8_t uuid[16];\n" |
d793d5e1 | 3904 | " uint32_t stream_id;\n" |
5594698f | 3905 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3906 | " };\n" |
d793d5e1 | 3907 | "};\n\n", |
a90917c3 MD |
3908 | lttng_alignof(uint8_t) * CHAR_BIT, |
3909 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3910 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3911 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3912 | sizeof(unsigned long) * CHAR_BIT, |
3913 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3914 | CTF_SPEC_MAJOR, |
3915 | CTF_SPEC_MINOR, | |
d793d5e1 | 3916 | uuid_s, |
5214fa50 | 3917 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3918 | "be" |
3919 | #else | |
3920 | "le" | |
3921 | #endif | |
3922 | ); | |
3923 | if (ret) | |
3924 | goto end; | |
3925 | ||
99dc9597 MD |
3926 | ret = lttng_metadata_printf(session, |
3927 | "env {\n" | |
a6058143 | 3928 | " hostname = \"%s\";\n" |
c6c9e10f | 3929 | " domain = \"kernel\";\n" |
99dc9597 | 3930 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3931 | " kernel_release = \"%s\";\n" |
3932 | " kernel_version = \"%s\";\n" | |
3933 | " tracer_name = \"lttng-modules\";\n" | |
3934 | " tracer_major = %d;\n" | |
3935 | " tracer_minor = %d;\n" | |
3936 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3937 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3938 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3939 | utsname()->sysname, |
3940 | utsname()->release, | |
c6c9e10f MD |
3941 | utsname()->version, |
3942 | LTTNG_MODULES_MAJOR_VERSION, | |
3943 | LTTNG_MODULES_MINOR_VERSION, | |
3944 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3945 | ); |
3946 | if (ret) | |
3947 | goto end; | |
3948 | ||
1c88f269 JR |
3949 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3950 | if (ret) | |
3951 | goto end; | |
3952 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3953 | session->creation_time); | |
3eb95be4 JR |
3954 | if (ret) |
3955 | goto end; | |
3956 | ||
c88f762e GB |
3957 | /* Add the product UUID to the 'env' section */ |
3958 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3959 | if (product_uuid) { | |
3960 | ret = lttng_metadata_printf(session, | |
3961 | " product_uuid = \"%s\";\n", | |
3962 | product_uuid | |
3963 | ); | |
3964 | if (ret) | |
3965 | goto end; | |
3966 | } | |
3967 | ||
3968 | /* Close the 'env' section */ | |
3eb95be4 JR |
3969 | ret = lttng_metadata_printf(session, "};\n\n"); |
3970 | if (ret) | |
3971 | goto end; | |
3972 | ||
a3ccff4f MD |
3973 | ret = lttng_metadata_printf(session, |
3974 | "clock {\n" | |
2754583e MD |
3975 | " name = \"%s\";\n", |
3976 | trace_clock_name() | |
a82c63f1 MD |
3977 | ); |
3978 | if (ret) | |
3979 | goto end; | |
3980 | ||
3981 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3982 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3983 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3984 | clock_uuid_s |
3985 | ); | |
3986 | if (ret) | |
3987 | goto end; | |
3988 | } | |
3989 | ||
3990 | ret = lttng_metadata_printf(session, | |
2754583e | 3991 | " description = \"%s\";\n" |
a3ccff4f MD |
3992 | " freq = %llu; /* Frequency, in Hz */\n" |
3993 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3994 | " offset = %lld;\n" |
a3ccff4f | 3995 | "};\n\n", |
2754583e | 3996 | trace_clock_description(), |
a3ccff4f | 3997 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3998 | (long long) measure_clock_offset() |
a3ccff4f MD |
3999 | ); |
4000 | if (ret) | |
4001 | goto end; | |
4002 | ||
4003 | ret = lttng_metadata_printf(session, | |
4004 | "typealias integer {\n" | |
4005 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4006 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4007 | "} := uint27_clock_monotonic_t;\n" |
4008 | "\n" | |
4009 | "typealias integer {\n" | |
4010 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4011 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4012 | "} := uint32_clock_monotonic_t;\n" |
4013 | "\n" | |
4014 | "typealias integer {\n" | |
4015 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4016 | " map = clock.%s.value;\n" |
a3ccff4f | 4017 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4018 | trace_clock_name(), |
a3ccff4f | 4019 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4020 | trace_clock_name(), |
4021 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4022 | trace_clock_name() | |
a3ccff4f MD |
4023 | ); |
4024 | if (ret) | |
4025 | goto end; | |
4026 | ||
a90917c3 | 4027 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4028 | if (ret) |
4029 | goto end; | |
4030 | ||
a90917c3 | 4031 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4032 | if (ret) |
4033 | goto end; | |
4034 | ||
c099397a MD |
4035 | skip_session: |
4036 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4037 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4038 | if (ret) |
4039 | goto end; | |
4040 | } | |
4041 | ||
a67ba386 MD |
4042 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
4043 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, | |
4044 | event_recorder_priv->pub); | |
c099397a MD |
4045 | if (ret) |
4046 | goto end; | |
4047 | } | |
4048 | session->metadata_dumped = 1; | |
4049 | end: | |
8b97fd42 | 4050 | lttng_metadata_end(session); |
c099397a MD |
4051 | return ret; |
4052 | } | |
4053 | ||
c0e31d2e | 4054 | /** |
a90917c3 | 4055 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4056 | * @transport: transport structure |
4057 | * | |
4058 | * Registers a transport which can be used as output to extract the data out of | |
4059 | * LTTng. The module calling this registration function must ensure that no | |
4060 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4061 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4062 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4063 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4064 | * after its registration must it synchronize the TLBs. |
4065 | */ | |
a90917c3 | 4066 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4067 | { |
4068 | /* | |
4069 | * Make sure no page fault can be triggered by the module about to be | |
4070 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4071 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4072 | */ |
263b6c88 | 4073 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4074 | |
4075 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4076 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4077 | mutex_unlock(&sessions_mutex); |
4078 | } | |
a90917c3 | 4079 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4080 | |
4081 | /** | |
a90917c3 | 4082 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4083 | * @transport: transport structure |
4084 | */ | |
a90917c3 | 4085 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4086 | { |
4087 | mutex_lock(&sessions_mutex); | |
4088 | list_del(&transport->node); | |
4089 | mutex_unlock(&sessions_mutex); | |
4090 | } | |
a90917c3 | 4091 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4092 | |
a101fa10 MD |
4093 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4094 | { | |
4095 | /* | |
4096 | * Make sure no page fault can be triggered by the module about to be | |
4097 | * registered. We deal with this here so we don't have to call | |
4098 | * vmalloc_sync_mappings() in each module's init. | |
4099 | */ | |
4100 | wrapper_vmalloc_sync_mappings(); | |
4101 | ||
4102 | mutex_lock(&sessions_mutex); | |
4103 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4104 | mutex_unlock(&sessions_mutex); | |
4105 | } | |
4106 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4107 | ||
4108 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4109 | { | |
4110 | mutex_lock(&sessions_mutex); | |
4111 | list_del(&transport->node); | |
4112 | mutex_unlock(&sessions_mutex); | |
4113 | } | |
4114 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4115 | ||
5f4c791e | 4116 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4117 | |
4118 | enum cpuhp_state lttng_hp_prepare; | |
4119 | enum cpuhp_state lttng_hp_online; | |
4120 | ||
4121 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4122 | { | |
4123 | struct lttng_cpuhp_node *lttng_node; | |
4124 | ||
4125 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4126 | switch (lttng_node->component) { | |
4127 | case LTTNG_RING_BUFFER_FRONTEND: | |
4128 | return 0; | |
4129 | case LTTNG_RING_BUFFER_BACKEND: | |
4130 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4131 | case LTTNG_RING_BUFFER_ITER: | |
4132 | return 0; | |
4133 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4134 | return 0; | |
4135 | default: | |
4136 | return -EINVAL; | |
4137 | } | |
4138 | } | |
4139 | ||
4140 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4141 | { | |
4142 | struct lttng_cpuhp_node *lttng_node; | |
4143 | ||
4144 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4145 | switch (lttng_node->component) { | |
4146 | case LTTNG_RING_BUFFER_FRONTEND: | |
4147 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4148 | case LTTNG_RING_BUFFER_BACKEND: | |
4149 | return 0; | |
4150 | case LTTNG_RING_BUFFER_ITER: | |
4151 | return 0; | |
4152 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4153 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4154 | default: | |
4155 | return -EINVAL; | |
4156 | } | |
4157 | } | |
4158 | ||
4159 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4160 | { | |
4161 | struct lttng_cpuhp_node *lttng_node; | |
4162 | ||
4163 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4164 | switch (lttng_node->component) { | |
4165 | case LTTNG_RING_BUFFER_FRONTEND: | |
4166 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4167 | case LTTNG_RING_BUFFER_BACKEND: | |
4168 | return 0; | |
4169 | case LTTNG_RING_BUFFER_ITER: | |
4170 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4171 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4172 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4173 | default: | |
4174 | return -EINVAL; | |
4175 | } | |
4176 | } | |
4177 | ||
4178 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4179 | { | |
4180 | struct lttng_cpuhp_node *lttng_node; | |
4181 | ||
4182 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4183 | switch (lttng_node->component) { | |
4184 | case LTTNG_RING_BUFFER_FRONTEND: | |
4185 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4186 | case LTTNG_RING_BUFFER_BACKEND: | |
4187 | return 0; | |
4188 | case LTTNG_RING_BUFFER_ITER: | |
4189 | return 0; | |
4190 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4191 | return 0; | |
4192 | default: | |
4193 | return -EINVAL; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | static int __init lttng_init_cpu_hotplug(void) | |
4198 | { | |
4199 | int ret; | |
4200 | ||
4201 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4202 | lttng_hotplug_prepare, | |
4203 | lttng_hotplug_dead); | |
4204 | if (ret < 0) { | |
4205 | return ret; | |
4206 | } | |
4207 | lttng_hp_prepare = ret; | |
4208 | lttng_rb_set_hp_prepare(ret); | |
4209 | ||
4210 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4211 | lttng_hotplug_online, | |
4212 | lttng_hotplug_offline); | |
4213 | if (ret < 0) { | |
4214 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4215 | lttng_hp_prepare = 0; | |
4216 | return ret; | |
4217 | } | |
4218 | lttng_hp_online = ret; | |
4219 | lttng_rb_set_hp_online(ret); | |
4220 | ||
4221 | return 0; | |
4222 | } | |
4223 | ||
4224 | static void __exit lttng_exit_cpu_hotplug(void) | |
4225 | { | |
4226 | lttng_rb_set_hp_online(0); | |
4227 | cpuhp_remove_multi_state(lttng_hp_online); | |
4228 | lttng_rb_set_hp_prepare(0); | |
4229 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4230 | } | |
4231 | ||
5f4c791e | 4232 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4233 | static int lttng_init_cpu_hotplug(void) |
4234 | { | |
4235 | return 0; | |
4236 | } | |
4237 | static void lttng_exit_cpu_hotplug(void) | |
4238 | { | |
4239 | } | |
5f4c791e | 4240 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4241 | |
4242 | ||
a90917c3 | 4243 | static int __init lttng_events_init(void) |
4e3c1b9b | 4244 | { |
1c25284c MD |
4245 | int ret; |
4246 | ||
453b2495 JD |
4247 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4248 | if (ret) | |
4249 | return ret; | |
389d7070 | 4250 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4251 | if (ret) |
4252 | return ret; | |
4253 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4254 | if (ret) |
4255 | return ret; | |
4256 | ret = lttng_probes_init(); | |
389d7070 MD |
4257 | if (ret) |
4258 | return ret; | |
07dfc1d0 | 4259 | ret = lttng_context_init(); |
20591cf7 MD |
4260 | if (ret) |
4261 | return ret; | |
07dfc1d0 MD |
4262 | ret = lttng_tracepoint_init(); |
4263 | if (ret) | |
4264 | goto error_tp; | |
a67ba386 MD |
4265 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4266 | if (!event_recorder_cache) { | |
20591cf7 | 4267 | ret = -ENOMEM; |
a67ba386 | 4268 | goto error_kmem_event_recorder; |
dffef45d | 4269 | } |
a67ba386 MD |
4270 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4271 | if (!event_recorder_private_cache) { | |
4272 | ret = -ENOMEM; | |
4273 | goto error_kmem_event_recorder_private; | |
4274 | } | |
4275 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4276 | if (!event_notifier_cache) { |
4277 | ret = -ENOMEM; | |
4278 | goto error_kmem_event_notifier; | |
20591cf7 | 4279 | } |
a67ba386 MD |
4280 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4281 | if (!event_notifier_private_cache) { | |
4282 | ret = -ENOMEM; | |
4283 | goto error_kmem_event_notifier_private; | |
4284 | } | |
80996790 | 4285 | ret = lttng_abi_init(); |
02119ee5 MD |
4286 | if (ret) |
4287 | goto error_abi; | |
0c956676 MD |
4288 | ret = lttng_logger_init(); |
4289 | if (ret) | |
4290 | goto error_logger; | |
1e367326 MD |
4291 | ret = lttng_init_cpu_hotplug(); |
4292 | if (ret) | |
4293 | goto error_hotplug; | |
101215b7 | 4294 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4295 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4296 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4297 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4298 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4299 | LTTNG_VERSION_NAME, |
4300 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4301 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4302 | #else | |
4303 | "", | |
4304 | #endif | |
4305 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4306 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4307 | #else | |
4308 | ""); | |
4309 | #endif | |
4e3c1b9b | 4310 | return 0; |
0c956676 | 4311 | |
1e367326 MD |
4312 | error_hotplug: |
4313 | lttng_logger_exit(); | |
0c956676 MD |
4314 | error_logger: |
4315 | lttng_abi_exit(); | |
02119ee5 | 4316 | error_abi: |
a67ba386 MD |
4317 | kmem_cache_destroy(event_notifier_private_cache); |
4318 | error_kmem_event_notifier_private: | |
dffef45d FD |
4319 | kmem_cache_destroy(event_notifier_cache); |
4320 | error_kmem_event_notifier: | |
a67ba386 MD |
4321 | kmem_cache_destroy(event_recorder_private_cache); |
4322 | error_kmem_event_recorder_private: | |
4323 | kmem_cache_destroy(event_recorder_cache); | |
4324 | error_kmem_event_recorder: | |
20591cf7 | 4325 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4326 | error_tp: |
4327 | lttng_context_exit(); | |
101215b7 | 4328 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4329 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4330 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4331 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4332 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4333 | LTTNG_VERSION_NAME, |
4334 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4335 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4336 | #else | |
4337 | "", | |
4338 | #endif | |
4339 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4340 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4341 | #else | |
4342 | ""); | |
4343 | #endif | |
1c25284c | 4344 | return ret; |
4e3c1b9b MD |
4345 | } |
4346 | ||
a90917c3 | 4347 | module_init(lttng_events_init); |
11b5a3c2 | 4348 | |
a90917c3 | 4349 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4350 | { |
a90917c3 | 4351 | struct lttng_session *session, *tmpsession; |
92e94819 | 4352 | |
1e367326 | 4353 | lttng_exit_cpu_hotplug(); |
0c956676 | 4354 | lttng_logger_exit(); |
80996790 | 4355 | lttng_abi_exit(); |
92e94819 | 4356 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4357 | lttng_session_destroy(session); |
a67ba386 MD |
4358 | kmem_cache_destroy(event_recorder_cache); |
4359 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4360 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4361 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4362 | lttng_tracepoint_exit(); |
07dfc1d0 | 4363 | lttng_context_exit(); |
101215b7 | 4364 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4365 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4366 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4367 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4368 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4369 | LTTNG_VERSION_NAME, |
4370 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4371 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4372 | #else | |
4373 | "", | |
4374 | #endif | |
4375 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4376 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4377 | #else | |
4378 | ""); | |
4379 | #endif | |
4e3c1b9b | 4380 | } |
92e94819 | 4381 | |
a90917c3 | 4382 | module_exit(lttng_events_exit); |
11b5a3c2 | 4383 | |
7ca11e77 | 4384 | #include <generated/patches.h> |
101215b7 MJ |
4385 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4386 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4387 | #endif | |
4388 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4389 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4390 | #endif | |
92e94819 MD |
4391 | MODULE_LICENSE("GPL and additional rights"); |
4392 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4393 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4394 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4395 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4396 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4397 | LTTNG_MODULES_EXTRAVERSION); |