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 | ||
a67ba386 | 606 | int lttng_event_enable(struct lttng_kernel_event_recorder *event_recorder) |
e64957da | 607 | { |
a67ba386 | 608 | struct lttng_kernel_event_common *event = &event_recorder->parent; |
3c997079 | 609 | int ret = 0; |
e64957da | 610 | |
3c997079 | 611 | mutex_lock(&sessions_mutex); |
a67ba386 | 612 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
613 | ret = -EPERM; |
614 | goto end; | |
615 | } | |
616 | if (event->enabled) { | |
617 | ret = -EEXIST; | |
618 | goto end; | |
619 | } | |
a67ba386 | 620 | switch (event->priv->instrumentation) { |
606828e4 MD |
621 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
622 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
623 | ret = -EINVAL; |
624 | break; | |
b4a75708 | 625 | |
606828e4 MD |
626 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
627 | case LTTNG_KERNEL_ABI_UPROBE: | |
a8f2d0c7 | 628 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 629 | break; |
b4a75708 | 630 | |
606828e4 | 631 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 632 | ret = lttng_kretprobes_event_enable_state(event_recorder, 1); |
a0493bef | 633 | break; |
b4a75708 | 634 | |
606828e4 MD |
635 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
636 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
637 | default: |
638 | WARN_ON_ONCE(1); | |
639 | ret = -EINVAL; | |
640 | } | |
3c997079 MD |
641 | end: |
642 | mutex_unlock(&sessions_mutex); | |
643 | return ret; | |
e64957da MD |
644 | } |
645 | ||
a67ba386 | 646 | int lttng_event_disable(struct lttng_kernel_event_recorder *event_recorder) |
e64957da | 647 | { |
a67ba386 | 648 | struct lttng_kernel_event_common *event = &event_recorder->parent; |
3c997079 | 649 | int ret = 0; |
e64957da | 650 | |
3c997079 | 651 | mutex_lock(&sessions_mutex); |
a67ba386 | 652 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
653 | ret = -EPERM; |
654 | goto end; | |
655 | } | |
656 | if (!event->enabled) { | |
657 | ret = -EEXIST; | |
658 | goto end; | |
659 | } | |
a67ba386 | 660 | switch (event->priv->instrumentation) { |
606828e4 MD |
661 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
662 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
663 | ret = -EINVAL; |
664 | break; | |
b4a75708 | 665 | |
606828e4 MD |
666 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
667 | case LTTNG_KERNEL_ABI_UPROBE: | |
a8f2d0c7 | 668 | WRITE_ONCE(event->enabled, 0); |
a0493bef | 669 | break; |
b4a75708 | 670 | |
606828e4 | 671 | case LTTNG_KERNEL_ABI_KRETPROBE: |
b4a75708 | 672 | |
a67ba386 | 673 | ret = lttng_kretprobes_event_enable_state(event_recorder, 0); |
a0493bef | 674 | break; |
b4a75708 | 675 | |
606828e4 MD |
676 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
677 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
678 | default: |
679 | WARN_ON_ONCE(1); | |
680 | ret = -EINVAL; | |
681 | } | |
3c997079 MD |
682 | end: |
683 | mutex_unlock(&sessions_mutex); | |
684 | return ret; | |
e64957da MD |
685 | } |
686 | ||
a67ba386 | 687 | int lttng_event_notifier_enable(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 688 | { |
a67ba386 | 689 | struct lttng_kernel_event_common *event = &event_notifier->parent; |
dffef45d FD |
690 | int ret = 0; |
691 | ||
692 | mutex_lock(&sessions_mutex); | |
a67ba386 | 693 | if (event->enabled) { |
dffef45d FD |
694 | ret = -EEXIST; |
695 | goto end; | |
696 | } | |
a67ba386 | 697 | switch (event->priv->instrumentation) { |
606828e4 MD |
698 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
699 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
700 | ret = -EINVAL; |
701 | break; | |
b4a75708 | 702 | |
606828e4 MD |
703 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
704 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 705 | WRITE_ONCE(event->enabled, 1); |
2b16f0c9 | 706 | break; |
b4a75708 | 707 | |
606828e4 MD |
708 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
709 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
710 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
711 | default: |
712 | WARN_ON_ONCE(1); | |
713 | ret = -EINVAL; | |
714 | } | |
715 | end: | |
716 | mutex_unlock(&sessions_mutex); | |
717 | return ret; | |
718 | } | |
719 | ||
a67ba386 | 720 | int lttng_event_notifier_disable(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 721 | { |
a67ba386 | 722 | struct lttng_kernel_event_common *event = &event_notifier->parent; |
dffef45d FD |
723 | int ret = 0; |
724 | ||
725 | mutex_lock(&sessions_mutex); | |
a67ba386 | 726 | if (!event->enabled) { |
dffef45d FD |
727 | ret = -EEXIST; |
728 | goto end; | |
729 | } | |
a67ba386 | 730 | switch (event->priv->instrumentation) { |
606828e4 MD |
731 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
732 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
733 | ret = -EINVAL; |
734 | break; | |
b4a75708 | 735 | |
606828e4 MD |
736 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
737 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 738 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 739 | break; |
b4a75708 | 740 | |
606828e4 MD |
741 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
742 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
743 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
744 | default: |
745 | WARN_ON_ONCE(1); | |
746 | ret = -EINVAL; | |
747 | } | |
748 | end: | |
749 | mutex_unlock(&sessions_mutex); | |
750 | return ret; | |
751 | } | |
752 | ||
a90917c3 | 753 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
754 | const char *transport_name, |
755 | void *buf_addr, | |
4e3c1b9b MD |
756 | size_t subbuf_size, size_t num_subbuf, |
757 | unsigned int switch_timer_interval, | |
d83004aa JD |
758 | unsigned int read_timer_interval, |
759 | enum channel_type channel_type) | |
4e3c1b9b | 760 | { |
a90917c3 MD |
761 | struct lttng_channel *chan; |
762 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
763 | |
764 | mutex_lock(&sessions_mutex); | |
d83004aa | 765 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 766 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 767 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 768 | if (!transport) { |
5a15f70c | 769 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 770 | transport_name); |
c0e31d2e | 771 | goto notransport; |
f3d01b96 | 772 | } |
a33c9927 | 773 | if (!try_module_get(transport->owner)) { |
5a15f70c | 774 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
775 | goto notransport; |
776 | } | |
a90917c3 | 777 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 778 | if (!chan) |
c0e31d2e | 779 | goto nomem; |
4e3c1b9b | 780 | chan->session = session; |
05d32c64 | 781 | chan->id = session->free_chan_id++; |
3b731ab1 | 782 | chan->ops = &transport->ops; |
125b4df4 MD |
783 | /* |
784 | * Note: the channel creation op already writes into the packet | |
785 | * headers. Therefore the "chan" information used as input | |
786 | * should be already accessible. | |
787 | */ | |
5f5ddf01 MD |
788 | chan->chan = transport->ops.channel_create(transport_name, |
789 | chan, buf_addr, subbuf_size, num_subbuf, | |
790 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
791 | if (!chan->chan) |
792 | goto create_error; | |
3c997079 | 793 | chan->tstate = 1; |
e64957da | 794 | chan->enabled = 1; |
a33c9927 | 795 | chan->transport = transport; |
d83004aa | 796 | chan->channel_type = channel_type; |
4e3c1b9b MD |
797 | list_add(&chan->list, &session->chan); |
798 | mutex_unlock(&sessions_mutex); | |
799 | return chan; | |
800 | ||
f3d01b96 MD |
801 | create_error: |
802 | kfree(chan); | |
c0e31d2e | 803 | nomem: |
a33c9927 MD |
804 | if (transport) |
805 | module_put(transport->owner); | |
c0e31d2e | 806 | notransport: |
e5382b6d | 807 | active: |
4e3c1b9b MD |
808 | mutex_unlock(&sessions_mutex); |
809 | return NULL; | |
810 | } | |
811 | ||
812 | /* | |
d83004aa JD |
813 | * Only used internally at session destruction for per-cpu channels, and |
814 | * when metadata channel is released. | |
815 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 816 | */ |
aa7c23a9 | 817 | static |
a90917c3 | 818 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 819 | { |
11b5a3c2 | 820 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 821 | module_put(chan->transport->owner); |
4e3c1b9b | 822 | list_del(&chan->list); |
437d5aa5 | 823 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
824 | kfree(chan); |
825 | } | |
826 | ||
d83004aa JD |
827 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
828 | { | |
829 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
830 | ||
831 | /* Protect the metadata cache with the sessions_mutex. */ | |
832 | mutex_lock(&sessions_mutex); | |
833 | _lttng_channel_destroy(chan); | |
834 | mutex_unlock(&sessions_mutex); | |
835 | } | |
836 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
837 | ||
838 | static | |
839 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
840 | { | |
841 | stream->finalized = 1; | |
842 | wake_up_interruptible(&stream->read_wait); | |
843 | } | |
844 | ||
a101fa10 | 845 | |
e5382b6d MD |
846 | /* |
847 | * Supports event creation while tracing session is active. | |
3c997079 | 848 | * Needs to be called with sessions mutex held. |
e5382b6d | 849 | */ |
a67ba386 | 850 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 851 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 852 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 853 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 854 | { |
3c997079 | 855 | struct lttng_session *session = chan->session; |
a67ba386 MD |
856 | struct lttng_kernel_event_recorder *event_recorder; |
857 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
858 | const char *event_name; |
859 | struct hlist_head *head; | |
3d084699 | 860 | int ret; |
4e3c1b9b | 861 | |
abc0446a | 862 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 863 | ret = -EMFILE; |
e5382b6d | 864 | goto full; |
abc0446a | 865 | } |
3c997079 MD |
866 | |
867 | switch (itype) { | |
606828e4 | 868 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 869 | event_name = event_desc->event_name; |
3c997079 | 870 | break; |
b4a75708 | 871 | |
606828e4 MD |
872 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
873 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
874 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
875 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
876 | event_name = event_param->name; |
877 | break; | |
b4a75708 | 878 | |
606828e4 MD |
879 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
880 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
881 | default: |
882 | WARN_ON_ONCE(1); | |
883 | ret = -EINVAL; | |
884 | goto type_error; | |
885 | } | |
4a11ef1c FD |
886 | |
887 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
888 | LTTNG_EVENT_HT_SIZE, event_name); | |
a67ba386 MD |
889 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
890 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
891 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 892 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 893 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
894 | ret = -EEXIST; |
895 | goto exist; | |
abc0446a MD |
896 | } |
897 | } | |
3c997079 | 898 | |
a67ba386 MD |
899 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
900 | if (!event_recorder) { | |
4cf0bf51 | 901 | ret = -ENOMEM; |
4e3c1b9b | 902 | goto cache_error; |
abc0446a | 903 | } |
a67ba386 MD |
904 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
905 | if (!event_recorder_priv) { | |
906 | ret = -ENOMEM; | |
907 | goto cache_private_error; | |
908 | } | |
909 | event_recorder_priv->pub = event_recorder; | |
910 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
911 | event_recorder->priv = event_recorder_priv; | |
912 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
913 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
914 | ||
915 | event_recorder->chan = chan; | |
916 | event_recorder->priv->id = chan->free_event_id++; | |
917 | event_recorder->priv->parent.instrumentation = itype; | |
918 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
919 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
920 | |
921 | switch (itype) { | |
606828e4 | 922 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 923 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
924 | event_recorder->parent.enabled = 0; |
925 | event_recorder->priv->parent.registered = 0; | |
926 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
927 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 928 | ret = -ENOENT; |
d3dbe23c | 929 | goto register_error; |
abc0446a | 930 | } |
3c997079 MD |
931 | /* Populate lttng_event structure before event registration. */ |
932 | smp_wmb(); | |
baf20995 | 933 | break; |
b4a75708 | 934 | |
606828e4 | 935 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
936 | /* |
937 | * Needs to be explicitly enabled after creation, since | |
938 | * we may want to apply filters. | |
939 | */ | |
a67ba386 MD |
940 | event_recorder->parent.enabled = 0; |
941 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
942 | /* |
943 | * Populate lttng_event structure before event | |
944 | * registration. | |
945 | */ | |
946 | smp_wmb(); | |
8bf17deb | 947 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
948 | event_param->u.kprobe.symbol_name, |
949 | event_param->u.kprobe.offset, | |
950 | event_param->u.kprobe.addr, | |
a67ba386 | 951 | event_recorder); |
abc0446a | 952 | if (ret) { |
4cf0bf51 | 953 | ret = -EINVAL; |
d6d808f3 | 954 | goto register_error; |
abc0446a | 955 | } |
a67ba386 | 956 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 957 | WARN_ON_ONCE(!ret); |
d6d808f3 | 958 | break; |
b4a75708 | 959 | |
606828e4 | 960 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 961 | { |
a67ba386 MD |
962 | struct lttng_kernel_event_recorder *event_recorder_return; |
963 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
964 | |
965 | /* kretprobe defines 2 events */ | |
a0493bef MD |
966 | /* |
967 | * Needs to be explicitly enabled after creation, since | |
968 | * we may want to apply filters. | |
969 | */ | |
a67ba386 MD |
970 | event_recorder->parent.enabled = 0; |
971 | event_recorder->priv->parent.registered = 1; | |
972 | ||
973 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
974 | if (!event_recorder_return) { | |
975 | ret = -ENOMEM; | |
976 | goto register_error; | |
977 | } | |
978 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
979 | if (!event_recorder_return_priv) { | |
980 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 981 | ret = -ENOMEM; |
7371f44c | 982 | goto register_error; |
abc0446a | 983 | } |
a67ba386 MD |
984 | event_recorder_return_priv->pub = event_recorder_return; |
985 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
986 | event_recorder_return->priv = event_recorder_return_priv; | |
987 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
988 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
989 | ||
990 | event_recorder_return->chan = chan; | |
991 | event_recorder_return->priv->id = chan->free_event_id++; | |
992 | event_recorder_return->priv->parent.instrumentation = itype; | |
993 | event_recorder_return->parent.enabled = 0; | |
994 | event_recorder_return->priv->parent.registered = 1; | |
995 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
996 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 997 | /* |
a90917c3 | 998 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
999 | */ |
1000 | smp_wmb(); | |
3c997079 | 1001 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1002 | event_param->u.kretprobe.symbol_name, |
1003 | event_param->u.kretprobe.offset, | |
1004 | event_param->u.kretprobe.addr, | |
a67ba386 | 1005 | event_recorder, event_recorder_return); |
7371f44c | 1006 | if (ret) { |
a67ba386 MD |
1007 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1008 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1009 | ret = -EINVAL; |
7371f44c MD |
1010 | goto register_error; |
1011 | } | |
1012 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1013 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1014 | WARN_ON_ONCE(!ret); |
a67ba386 | 1015 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1016 | WARN_ON_ONCE(!ret); |
a90917c3 | 1017 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
a67ba386 | 1018 | event_recorder_return); |
abc0446a | 1019 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1020 | if (ret) { |
a67ba386 MD |
1021 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1022 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1023 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1024 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1025 | goto statedump_error; |
1026 | } | |
a67ba386 | 1027 | list_add(&event_recorder_return->priv->node, &chan->session->events); |
7371f44c MD |
1028 | break; |
1029 | } | |
b4a75708 | 1030 | |
606828e4 | 1031 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1032 | /* |
1033 | * Needs to be explicitly enabled after creation, since | |
1034 | * we may want to apply filters. | |
1035 | */ | |
a67ba386 MD |
1036 | event_recorder->parent.enabled = 0; |
1037 | event_recorder->priv->parent.registered = 0; | |
1038 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1039 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1040 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1041 | ret = -EINVAL; |
1042 | goto register_error; | |
606828e4 | 1043 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1044 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1045 | break; |
606828e4 | 1046 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1047 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1048 | break; |
1049 | } | |
1050 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1051 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1052 | ret = -EINVAL; |
1053 | goto register_error; | |
606828e4 | 1054 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1055 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1056 | break; |
606828e4 | 1057 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1058 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1059 | break; |
1060 | } | |
a67ba386 | 1061 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1062 | ret = -EINVAL; |
259b6cb3 | 1063 | goto register_error; |
abc0446a | 1064 | } |
1ec65de1 | 1065 | break; |
b4a75708 | 1066 | |
606828e4 | 1067 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1068 | /* |
1069 | * Needs to be explicitly enabled after creation, since | |
1070 | * we may want to apply filters. | |
1071 | */ | |
a67ba386 MD |
1072 | event_recorder->parent.enabled = 0; |
1073 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1074 | |
a344f64b FD |
1075 | /* |
1076 | * Populate lttng_event structure before event | |
1077 | * registration. | |
1078 | */ | |
1079 | smp_wmb(); | |
149b9a9d | 1080 | |
83b802dc | 1081 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1082 | event_param->u.uprobe.fd, |
a67ba386 | 1083 | event_recorder); |
149b9a9d YB |
1084 | if (ret) |
1085 | goto register_error; | |
a67ba386 | 1086 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1087 | WARN_ON_ONCE(!ret); |
1088 | break; | |
b4a75708 | 1089 | |
606828e4 MD |
1090 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1091 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1092 | default: |
1093 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1094 | ret = -EINVAL; |
df07930b | 1095 | goto register_error; |
baf20995 | 1096 | } |
a67ba386 | 1097 | ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder); |
abc0446a MD |
1098 | WARN_ON_ONCE(ret > 0); |
1099 | if (ret) { | |
c099397a | 1100 | goto statedump_error; |
abc0446a | 1101 | } |
a67ba386 MD |
1102 | hlist_add_head(&event_recorder->priv->hlist, head); |
1103 | list_add(&event_recorder->priv->node, &chan->session->events); | |
1104 | return event_recorder; | |
4e3c1b9b | 1105 | |
c099397a | 1106 | statedump_error: |
259b6cb3 | 1107 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1108 | register_error: |
a67ba386 MD |
1109 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1110 | cache_private_error: | |
1111 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1112 | cache_error: |
1113 | exist: | |
3c997079 | 1114 | type_error: |
e5382b6d | 1115 | full: |
4cf0bf51 | 1116 | return ERR_PTR(ret); |
4e3c1b9b MD |
1117 | } |
1118 | ||
a67ba386 | 1119 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1120 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1121 | uint64_t token, uint64_t error_counter_index, |
1122 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1123 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1124 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1125 | { |
a67ba386 MD |
1126 | struct lttng_kernel_event_notifier *event_notifier; |
1127 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1128 | struct lttng_counter *error_counter; |
dffef45d FD |
1129 | const char *event_name; |
1130 | struct hlist_head *head; | |
1131 | int ret; | |
1132 | ||
1133 | switch (itype) { | |
606828e4 | 1134 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1135 | event_name = event_desc->event_name; |
b01155ba | 1136 | break; |
b4a75708 | 1137 | |
606828e4 MD |
1138 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1139 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1140 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1141 | event_name = event_notifier_param->event.name; |
1142 | break; | |
b4a75708 | 1143 | |
606828e4 MD |
1144 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1145 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1146 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1147 | default: |
1148 | WARN_ON_ONCE(1); | |
1149 | ret = -EINVAL; | |
1150 | goto type_error; | |
1151 | } | |
1152 | ||
1153 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1154 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1155 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1156 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1157 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1158 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1159 | && event_notifier_group == event_notifier_priv->group |
1160 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1161 | ret = -EEXIST; |
1162 | goto exist; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1167 | if (!event_notifier) { | |
1168 | ret = -ENOMEM; | |
1169 | goto cache_error; | |
1170 | } | |
a67ba386 MD |
1171 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1172 | if (!event_notifier_priv) { | |
1173 | ret = -ENOMEM; | |
1174 | goto cache_private_error; | |
1175 | } | |
1176 | event_notifier_priv->pub = event_notifier; | |
1177 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1178 | event_notifier->priv = event_notifier_priv; | |
1179 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1180 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1181 | ||
1182 | event_notifier->priv->group = event_notifier_group; | |
1183 | event_notifier->priv->parent.user_token = token; | |
1184 | event_notifier->priv->error_counter_index = error_counter_index; | |
1185 | event_notifier->priv->num_captures = 0; | |
1186 | event_notifier->priv->parent.instrumentation = itype; | |
1187 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1188 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1189 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1190 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
dffef45d FD |
1191 | |
1192 | switch (itype) { | |
606828e4 | 1193 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1194 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1195 | event_notifier->parent.enabled = 0; |
1196 | event_notifier->priv->parent.registered = 0; | |
1197 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1198 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1199 | ret = -ENOENT; |
1200 | goto register_error; | |
1201 | } | |
1202 | /* Populate lttng_event_notifier structure before event registration. */ | |
1203 | smp_wmb(); | |
1204 | break; | |
b4a75708 | 1205 | |
606828e4 | 1206 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1207 | /* |
1208 | * Needs to be explicitly enabled after creation, since | |
1209 | * we may want to apply filters. | |
1210 | */ | |
a67ba386 MD |
1211 | event_notifier->parent.enabled = 0; |
1212 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1213 | /* |
1214 | * Populate lttng_event_notifier structure before event | |
1215 | * registration. | |
1216 | */ | |
1217 | smp_wmb(); | |
1218 | ret = lttng_kprobes_register_event_notifier( | |
1219 | event_notifier_param->event.u.kprobe.symbol_name, | |
1220 | event_notifier_param->event.u.kprobe.offset, | |
1221 | event_notifier_param->event.u.kprobe.addr, | |
1222 | event_notifier); | |
1223 | if (ret) { | |
1224 | ret = -EINVAL; | |
1225 | goto register_error; | |
1226 | } | |
a67ba386 | 1227 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1228 | WARN_ON_ONCE(!ret); |
1229 | break; | |
b4a75708 | 1230 | |
606828e4 | 1231 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1232 | /* |
1233 | * Needs to be explicitly enabled after creation, since | |
1234 | * we may want to apply filters. | |
1235 | */ | |
a67ba386 MD |
1236 | event_notifier->parent.enabled = 0; |
1237 | event_notifier->priv->parent.registered = 0; | |
1238 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1239 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1240 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1241 | ret = -EINVAL; |
1242 | goto register_error; | |
606828e4 | 1243 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1244 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1245 | break; |
606828e4 | 1246 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1247 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1248 | break; |
1249 | } | |
1250 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1251 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1252 | ret = -EINVAL; |
1253 | goto register_error; | |
606828e4 | 1254 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1255 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1256 | break; |
606828e4 | 1257 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1258 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1259 | break; |
1260 | } | |
1261 | ||
a67ba386 | 1262 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1263 | ret = -EINVAL; |
1264 | goto register_error; | |
1265 | } | |
1266 | break; | |
b4a75708 | 1267 | |
606828e4 | 1268 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1269 | /* |
1270 | * Needs to be explicitly enabled after creation, since | |
1271 | * we may want to apply filters. | |
1272 | */ | |
a67ba386 MD |
1273 | event_notifier->parent.enabled = 0; |
1274 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1275 | |
1276 | /* | |
1277 | * Populate lttng_event_notifier structure before | |
1278 | * event_notifier registration. | |
1279 | */ | |
1280 | smp_wmb(); | |
1281 | ||
1282 | ret = lttng_uprobes_register_event_notifier( | |
1283 | event_notifier_param->event.name, | |
1284 | event_notifier_param->event.u.uprobe.fd, | |
1285 | event_notifier); | |
1286 | if (ret) | |
1287 | goto register_error; | |
a67ba386 | 1288 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1289 | WARN_ON_ONCE(!ret); |
1290 | break; | |
b4a75708 | 1291 | |
606828e4 MD |
1292 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1293 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1294 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1295 | default: |
1296 | WARN_ON_ONCE(1); | |
1297 | ret = -EINVAL; | |
1298 | goto register_error; | |
1299 | } | |
1300 | ||
a67ba386 MD |
1301 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1302 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1303 | |
1304 | /* | |
1305 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1306 | * bucket is currently in use. We trust it. The session lock |
1307 | * synchronizes against concurrent creation of the error | |
1308 | * counter. | |
99f52fcc | 1309 | */ |
ab04d7b1 MD |
1310 | error_counter = event_notifier_group->error_counter; |
1311 | if (error_counter) { | |
99f52fcc FD |
1312 | size_t dimension_index[1]; |
1313 | ||
1314 | /* | |
1315 | * Check that the index is within the boundary of the counter. | |
1316 | */ | |
a67ba386 | 1317 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1318 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1319 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1320 | ret = -EINVAL; |
1321 | goto register_error; | |
1322 | } | |
1323 | ||
a67ba386 | 1324 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1325 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1326 | if (ret) { |
1327 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1328 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1329 | goto register_error; |
1330 | } | |
1331 | } | |
1332 | ||
dffef45d FD |
1333 | return event_notifier; |
1334 | ||
1335 | register_error: | |
a67ba386 MD |
1336 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1337 | cache_private_error: | |
dffef45d FD |
1338 | kmem_cache_free(event_notifier_cache, event_notifier); |
1339 | cache_error: | |
1340 | exist: | |
1341 | type_error: | |
1342 | return ERR_PTR(ret); | |
1343 | } | |
1344 | ||
99f52fcc FD |
1345 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1346 | const size_t *dim_indexes, int32_t cpu, | |
1347 | int64_t *val, bool *overflow, bool *underflow) | |
1348 | { | |
1349 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1350 | cpu, val, overflow, underflow); | |
1351 | } | |
1352 | ||
1353 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1354 | const size_t *dim_indexes, int64_t *val, | |
1355 | bool *overflow, bool *underflow) | |
1356 | { | |
1357 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1358 | val, overflow, underflow); | |
1359 | } | |
1360 | ||
1361 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1362 | const size_t *dim_indexes) | |
1363 | { | |
1364 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1365 | } | |
1366 | ||
a67ba386 | 1367 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 1368 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1369 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1370 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1371 | { |
a67ba386 | 1372 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1373 | |
1374 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1375 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1376 | mutex_unlock(&sessions_mutex); |
1377 | return event; | |
1378 | } | |
1379 | ||
a67ba386 | 1380 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1381 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1382 | uint64_t id, uint64_t error_counter_index, |
1383 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1384 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1385 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1386 | { |
a67ba386 | 1387 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1388 | |
1389 | mutex_lock(&sessions_mutex); | |
1390 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1391 | error_counter_index, event_notifier_group, |
a67ba386 | 1392 | event_notifier_param, itype); |
dffef45d FD |
1393 | mutex_unlock(&sessions_mutex); |
1394 | return event_notifier; | |
1395 | } | |
1396 | ||
3c997079 MD |
1397 | /* Only used for tracepoints for now. */ |
1398 | static | |
a67ba386 | 1399 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1400 | { |
437d5aa5 | 1401 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1402 | int ret = -EINVAL; |
3c997079 | 1403 | |
a67ba386 | 1404 | if (event_recorder->priv->parent.registered) |
3c997079 | 1405 | return; |
4ecb5ad5 | 1406 | |
a67ba386 MD |
1407 | desc = event_recorder->priv->parent.desc; |
1408 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1409 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1410 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 | 1411 | desc->probe_callback, |
a67ba386 | 1412 | event_recorder); |
4ecb5ad5 | 1413 | break; |
b4a75708 | 1414 | |
606828e4 | 1415 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1416 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1417 | break; |
b4a75708 | 1418 | |
606828e4 MD |
1419 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1420 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1421 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1422 | ret = 0; |
1423 | break; | |
b4a75708 | 1424 | |
606828e4 MD |
1425 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1426 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1427 | default: |
1428 | WARN_ON_ONCE(1); | |
1429 | } | |
3c997079 | 1430 | if (!ret) |
a67ba386 | 1431 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1432 | } |
1433 | ||
4e3c1b9b MD |
1434 | /* |
1435 | * Only used internally at session destruction. | |
1436 | */ | |
a67ba386 | 1437 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1438 | { |
a67ba386 | 1439 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1440 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1441 | int ret = -EINVAL; |
1442 | ||
a67ba386 | 1443 | if (!event_priv->registered) |
3c997079 MD |
1444 | return 0; |
1445 | ||
a67ba386 MD |
1446 | desc = event_priv->desc; |
1447 | switch (event_priv->instrumentation) { | |
606828e4 | 1448 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1449 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
1450 | event_priv->desc->probe_callback, | |
1451 | event_recorder); | |
baf20995 | 1452 | break; |
b4a75708 | 1453 | |
606828e4 | 1454 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1455 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1456 | ret = 0; |
1457 | break; | |
b4a75708 | 1458 | |
606828e4 | 1459 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1460 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1461 | ret = 0; |
1462 | break; | |
b4a75708 | 1463 | |
606828e4 | 1464 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1465 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1466 | break; |
b4a75708 | 1467 | |
606828e4 | 1468 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1469 | ret = 0; |
1470 | break; | |
b4a75708 | 1471 | |
606828e4 | 1472 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1473 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1474 | ret = 0; |
1475 | break; | |
b4a75708 | 1476 | |
606828e4 | 1477 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1478 | default: |
1479 | WARN_ON_ONCE(1); | |
1480 | } | |
3c997079 | 1481 | if (!ret) |
a67ba386 | 1482 | event_priv->registered = 0; |
dda6a249 MD |
1483 | return ret; |
1484 | } | |
1485 | ||
dffef45d FD |
1486 | /* Only used for tracepoints for now. */ |
1487 | static | |
a67ba386 | 1488 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1489 | { |
437d5aa5 | 1490 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1491 | int ret = -EINVAL; |
1492 | ||
a67ba386 | 1493 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1494 | return; |
1495 | ||
a67ba386 MD |
1496 | desc = event_notifier->priv->parent.desc; |
1497 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1498 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1499 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
b01155ba FD |
1500 | desc->event_notifier_callback, |
1501 | event_notifier); | |
1502 | break; | |
b4a75708 | 1503 | |
606828e4 | 1504 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1505 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1506 | break; | |
b4a75708 | 1507 | |
606828e4 MD |
1508 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1509 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1510 | ret = 0; |
1511 | break; | |
b4a75708 | 1512 | |
606828e4 MD |
1513 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1514 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1515 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1516 | default: |
1517 | WARN_ON_ONCE(1); | |
1518 | } | |
1519 | if (!ret) | |
a67ba386 | 1520 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1521 | } |
1522 | ||
1523 | static | |
1524 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1525 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1526 | { |
437d5aa5 | 1527 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1528 | int ret = -EINVAL; |
1529 | ||
a67ba386 | 1530 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1531 | return 0; |
1532 | ||
a67ba386 MD |
1533 | desc = event_notifier->priv->parent.desc; |
1534 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1535 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1536 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
1537 | event_notifier->priv->parent.desc->event_notifier_callback, | |
b01155ba FD |
1538 | event_notifier); |
1539 | break; | |
b4a75708 | 1540 | |
606828e4 | 1541 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1542 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1543 | ret = 0; | |
1544 | break; | |
b4a75708 | 1545 | |
606828e4 | 1546 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1547 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1548 | ret = 0; | |
1549 | break; | |
b4a75708 | 1550 | |
606828e4 | 1551 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1552 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1553 | break; | |
b4a75708 | 1554 | |
606828e4 MD |
1555 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1556 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1557 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1558 | default: |
1559 | WARN_ON_ONCE(1); | |
1560 | } | |
1561 | if (!ret) | |
a67ba386 | 1562 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1563 | return ret; |
1564 | } | |
1565 | ||
dda6a249 MD |
1566 | /* |
1567 | * Only used internally at session destruction. | |
1568 | */ | |
be066e6c | 1569 | static |
0648898e | 1570 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1571 | { |
0648898e | 1572 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1573 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1574 | ||
0648898e MD |
1575 | lttng_free_event_filter_runtime(event); |
1576 | /* Free event enabler refs */ | |
1577 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1578 | &event_priv->enablers_ref_head, node) | |
1579 | kfree(enabler_ref); | |
b4a75708 | 1580 | |
0648898e MD |
1581 | switch (event->type) { |
1582 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1583 | { | |
1584 | struct lttng_kernel_event_recorder *event_recorder = | |
1585 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1586 | |
0648898e MD |
1587 | switch (event_priv->instrumentation) { |
1588 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1589 | lttng_event_desc_put(event_priv->desc); | |
1590 | break; | |
b4a75708 | 1591 | |
0648898e MD |
1592 | case LTTNG_KERNEL_ABI_KPROBE: |
1593 | module_put(event_priv->desc->owner); | |
1594 | lttng_kprobes_destroy_event_private(event_recorder); | |
1595 | break; | |
b4a75708 | 1596 | |
0648898e MD |
1597 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1598 | module_put(event_priv->desc->owner); | |
1599 | lttng_kretprobes_destroy_private(event_recorder); | |
1600 | break; | |
b4a75708 | 1601 | |
0648898e MD |
1602 | case LTTNG_KERNEL_ABI_SYSCALL: |
1603 | break; | |
4e3c1b9b | 1604 | |
0648898e MD |
1605 | case LTTNG_KERNEL_ABI_UPROBE: |
1606 | module_put(event_priv->desc->owner); | |
1607 | lttng_uprobes_destroy_event_private(event_recorder); | |
1608 | break; | |
3ef5cc03 | 1609 | |
0648898e MD |
1610 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1611 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1612 | default: | |
1613 | WARN_ON_ONCE(1); | |
1614 | } | |
1615 | list_del(&event_recorder->priv->node); | |
1616 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1617 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1618 | break; |
0648898e MD |
1619 | } |
1620 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1621 | { | |
1622 | struct lttng_kernel_event_notifier *event_notifier = | |
1623 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1624 | |
0648898e MD |
1625 | switch (event_notifier->priv->parent.instrumentation) { |
1626 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1627 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1628 | break; | |
b4a75708 | 1629 | |
0648898e MD |
1630 | case LTTNG_KERNEL_ABI_KPROBE: |
1631 | module_put(event_notifier->priv->parent.desc->owner); | |
1632 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1633 | break; | |
b4a75708 | 1634 | |
0648898e MD |
1635 | case LTTNG_KERNEL_ABI_SYSCALL: |
1636 | break; | |
b4a75708 | 1637 | |
0648898e MD |
1638 | case LTTNG_KERNEL_ABI_UPROBE: |
1639 | module_put(event_notifier->priv->parent.desc->owner); | |
1640 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1641 | break; | |
1642 | ||
1643 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1644 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1645 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1646 | default: | |
1647 | WARN_ON_ONCE(1); | |
1648 | } | |
1649 | list_del(&event_notifier->priv->node); | |
1650 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1651 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1652 | break; | |
1653 | } | |
dffef45d FD |
1654 | default: |
1655 | WARN_ON_ONCE(1); | |
1656 | } | |
dffef45d FD |
1657 | } |
1658 | ||
d1f652f8 MD |
1659 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1660 | enum tracker_type tracker_type) | |
e0130fab | 1661 | { |
d1f652f8 MD |
1662 | switch (tracker_type) { |
1663 | case TRACKER_PID: | |
1664 | return &session->pid_tracker; | |
1665 | case TRACKER_VPID: | |
1666 | return &session->vpid_tracker; | |
1667 | case TRACKER_UID: | |
1668 | return &session->uid_tracker; | |
1669 | case TRACKER_VUID: | |
1670 | return &session->vuid_tracker; | |
1671 | case TRACKER_GID: | |
1672 | return &session->gid_tracker; | |
1673 | case TRACKER_VGID: | |
1674 | return &session->vgid_tracker; | |
1675 | default: | |
1676 | WARN_ON_ONCE(1); | |
1677 | return NULL; | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | int lttng_session_track_id(struct lttng_session *session, | |
1682 | enum tracker_type tracker_type, int id) | |
1683 | { | |
1684 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1685 | int ret; |
1686 | ||
d1f652f8 MD |
1687 | tracker = get_tracker(session, tracker_type); |
1688 | if (!tracker) | |
1689 | return -EINVAL; | |
1690 | if (id < -1) | |
e0130fab MD |
1691 | return -EINVAL; |
1692 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1693 | if (id == -1) { |
1694 | /* track all ids: destroy tracker. */ | |
1695 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1696 | ret = 0; |
1697 | } else { | |
d1f652f8 | 1698 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1699 | } |
e0130fab MD |
1700 | mutex_unlock(&sessions_mutex); |
1701 | return ret; | |
1702 | } | |
1703 | ||
d1f652f8 MD |
1704 | int lttng_session_untrack_id(struct lttng_session *session, |
1705 | enum tracker_type tracker_type, int id) | |
e0130fab | 1706 | { |
d1f652f8 | 1707 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1708 | int ret; |
1709 | ||
d1f652f8 MD |
1710 | tracker = get_tracker(session, tracker_type); |
1711 | if (!tracker) | |
1712 | return -EINVAL; | |
1713 | if (id < -1) | |
e0130fab MD |
1714 | return -EINVAL; |
1715 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1716 | if (id == -1) { |
1717 | /* untrack all ids: replace by empty tracker. */ | |
1718 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1719 | } else { |
d1f652f8 | 1720 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1721 | } |
e0130fab MD |
1722 | mutex_unlock(&sessions_mutex); |
1723 | return ret; | |
1724 | } | |
1725 | ||
7e6f9ef6 | 1726 | static |
d1f652f8 | 1727 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1728 | { |
d1f652f8 MD |
1729 | struct lttng_id_tracker *id_tracker = m->private; |
1730 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1731 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1732 | int iter = 0, i; |
1733 | ||
1734 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1735 | if (id_tracker_p) { |
1736 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1737 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1738 | |
f934e302 | 1739 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1740 | if (iter++ >= *pos) |
1741 | return e; | |
1742 | } | |
1743 | } | |
1744 | } else { | |
d1f652f8 | 1745 | /* ID tracker disabled. */ |
7e6f9ef6 | 1746 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1747 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1748 | } |
1749 | iter++; | |
1750 | } | |
1751 | /* End of list */ | |
1752 | return NULL; | |
1753 | } | |
1754 | ||
1755 | /* Called with sessions_mutex held. */ | |
1756 | static | |
d1f652f8 | 1757 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1758 | { |
d1f652f8 MD |
1759 | struct lttng_id_tracker *id_tracker = m->private; |
1760 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1761 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1762 | int iter = 0, i; |
1763 | ||
1764 | (*ppos)++; | |
d1f652f8 MD |
1765 | if (id_tracker_p) { |
1766 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1767 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1768 | |
f934e302 | 1769 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1770 | if (iter++ >= *ppos) |
1771 | return e; | |
1772 | } | |
1773 | } | |
1774 | } else { | |
d1f652f8 | 1775 | /* ID tracker disabled. */ |
7e6f9ef6 | 1776 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1777 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1778 | iter++; |
1779 | } | |
1780 | ||
1781 | /* End of list */ | |
1782 | return NULL; | |
1783 | } | |
1784 | ||
1785 | static | |
d1f652f8 | 1786 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1787 | { |
1788 | mutex_unlock(&sessions_mutex); | |
1789 | } | |
1790 | ||
1791 | static | |
d1f652f8 | 1792 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1793 | { |
d1f652f8 MD |
1794 | struct lttng_id_tracker *id_tracker = m->private; |
1795 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1796 | int id; | |
7e6f9ef6 | 1797 | |
d1f652f8 | 1798 | if (p == id_tracker_p) { |
7e6f9ef6 | 1799 | /* Tracker disabled. */ |
d1f652f8 | 1800 | id = -1; |
7e6f9ef6 | 1801 | } else { |
d1f652f8 | 1802 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1803 | |
d1f652f8 MD |
1804 | id = lttng_id_tracker_get_node_id(e); |
1805 | } | |
1806 | switch (id_tracker->tracker_type) { | |
1807 | case TRACKER_PID: | |
1808 | seq_printf(m, "process { pid = %d; };\n", id); | |
1809 | break; | |
1810 | case TRACKER_VPID: | |
1811 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1812 | break; | |
1813 | case TRACKER_UID: | |
1814 | seq_printf(m, "user { uid = %d; };\n", id); | |
1815 | break; | |
1816 | case TRACKER_VUID: | |
1817 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1818 | break; | |
1819 | case TRACKER_GID: | |
1820 | seq_printf(m, "group { gid = %d; };\n", id); | |
1821 | break; | |
1822 | case TRACKER_VGID: | |
1823 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1824 | break; | |
1825 | default: | |
1826 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1827 | } |
7e6f9ef6 MD |
1828 | return 0; |
1829 | } | |
1830 | ||
1831 | static | |
d1f652f8 MD |
1832 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1833 | .start = id_list_start, | |
1834 | .next = id_list_next, | |
1835 | .stop = id_list_stop, | |
1836 | .show = id_list_show, | |
7e6f9ef6 MD |
1837 | }; |
1838 | ||
1839 | static | |
d1f652f8 | 1840 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1841 | { |
d1f652f8 | 1842 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1843 | } |
1844 | ||
1845 | static | |
d1f652f8 | 1846 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1847 | { |
1848 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1849 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1850 | int ret; |
1851 | ||
d1f652f8 | 1852 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1853 | ret = seq_release(inode, file); |
d1f652f8 MD |
1854 | if (!ret) |
1855 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1856 | return ret; |
1857 | } | |
1858 | ||
d1f652f8 | 1859 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1860 | .owner = THIS_MODULE, |
d1f652f8 | 1861 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1862 | .read = seq_read, |
1863 | .llseek = seq_lseek, | |
d1f652f8 | 1864 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1865 | }; |
1866 | ||
d1f652f8 MD |
1867 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1868 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1869 | { |
d1f652f8 | 1870 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1871 | struct seq_file *m; |
1872 | int file_fd, ret; | |
1873 | ||
1874 | file_fd = lttng_get_unused_fd(); | |
1875 | if (file_fd < 0) { | |
1876 | ret = file_fd; | |
1877 | goto fd_error; | |
1878 | } | |
1879 | ||
d1f652f8 MD |
1880 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1881 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1882 | NULL, O_RDWR); |
d1f652f8 MD |
1883 | if (IS_ERR(tracker_ids_list_file)) { |
1884 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1885 | goto file_error; |
1886 | } | |
98d7281c MJ |
1887 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1888 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1889 | goto refcount_error; |
1890 | } | |
d1f652f8 | 1891 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1892 | if (ret < 0) |
1893 | goto open_error; | |
d1f652f8 MD |
1894 | m = tracker_ids_list_file->private_data; |
1895 | ||
1896 | m->private = get_tracker(session, tracker_type); | |
1897 | BUG_ON(!m->private); | |
1898 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1899 | |
1900 | return file_fd; | |
1901 | ||
1902 | open_error: | |
9c1f4643 MD |
1903 | atomic_long_dec(&session->file->f_count); |
1904 | refcount_error: | |
d1f652f8 | 1905 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1906 | file_error: |
1907 | put_unused_fd(file_fd); | |
1908 | fd_error: | |
1909 | return ret; | |
1910 | } | |
1911 | ||
3c997079 MD |
1912 | /* |
1913 | * Enabler management. | |
1914 | */ | |
1915 | static | |
4993071a PP |
1916 | int lttng_match_enabler_star_glob(const char *desc_name, |
1917 | const char *pattern) | |
3c997079 | 1918 | { |
cbc19040 MD |
1919 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1920 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1921 | return 0; |
1922 | return 1; | |
1923 | } | |
1924 | ||
1925 | static | |
4ecb5ad5 MD |
1926 | int lttng_match_enabler_name(const char *desc_name, |
1927 | const char *name) | |
3c997079 | 1928 | { |
4ecb5ad5 | 1929 | if (strcmp(desc_name, name)) |
3c997079 MD |
1930 | return 0; |
1931 | return 1; | |
1932 | } | |
1933 | ||
437d5aa5 | 1934 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1935 | struct lttng_enabler *enabler) |
1936 | { | |
4ecb5ad5 | 1937 | const char *desc_name, *enabler_name; |
badfe9f5 | 1938 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1939 | |
1940 | enabler_name = enabler->event_param.name; | |
1941 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1942 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1943 | desc_name = desc->event_name; |
3b861b22 FD |
1944 | switch (enabler->format_type) { |
1945 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1946 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1947 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1948 | return lttng_match_enabler_name(desc_name, enabler_name); |
1949 | default: | |
1950 | return -EINVAL; | |
1951 | } | |
4ecb5ad5 | 1952 | break; |
b4a75708 | 1953 | |
606828e4 | 1954 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1955 | desc_name = desc->event_name; |
badfe9f5 | 1956 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1957 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1958 | compat = true; |
1959 | } | |
4ecb5ad5 MD |
1960 | if (!strncmp(desc_name, "syscall_exit_", |
1961 | strlen("syscall_exit_"))) { | |
1962 | desc_name += strlen("syscall_exit_"); | |
1963 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1964 | strlen("syscall_entry_"))) { | |
1965 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1966 | entry = true; |
4ecb5ad5 MD |
1967 | } else { |
1968 | WARN_ON_ONCE(1); | |
1969 | return -EINVAL; | |
1970 | } | |
badfe9f5 | 1971 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1972 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1973 | break; |
606828e4 | 1974 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1975 | if (!entry) |
1976 | return 0; | |
1977 | break; | |
606828e4 | 1978 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1979 | if (entry) |
1980 | return 0; | |
1981 | break; | |
1982 | default: | |
1983 | return -EINVAL; | |
1984 | } | |
1985 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1986 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1987 | break; |
606828e4 | 1988 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1989 | if (compat) |
1990 | return 0; | |
1991 | break; | |
606828e4 | 1992 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1993 | if (!compat) |
1994 | return 0; | |
1995 | break; | |
1996 | default: | |
1997 | return -EINVAL; | |
1998 | } | |
1999 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2000 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2001 | switch (enabler->format_type) { |
2002 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2003 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2004 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2005 | return lttng_match_enabler_name(desc_name, enabler_name); |
2006 | default: | |
2007 | return -EINVAL; | |
2008 | } | |
2009 | break; | |
606828e4 | 2010 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2011 | return -EINVAL; /* Not implemented. */ |
2012 | default: | |
2013 | return -EINVAL; | |
2014 | } | |
4ecb5ad5 | 2015 | break; |
b4a75708 | 2016 | |
4ecb5ad5 MD |
2017 | default: |
2018 | WARN_ON_ONCE(1); | |
2019 | return -EINVAL; | |
2020 | } | |
3c997079 MD |
2021 | } |
2022 | ||
2023 | static | |
b2bc0bc8 | 2024 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2025 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2026 | { |
b2bc0bc8 FD |
2027 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2028 | event_enabler); | |
2029 | ||
a67ba386 | 2030 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2031 | return 0; |
a67ba386 MD |
2032 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2033 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2034 | return 1; |
2035 | else | |
2036 | return 0; | |
2037 | } | |
2038 | ||
b01155ba FD |
2039 | static |
2040 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2041 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2042 | { |
2043 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2044 | event_notifier_enabler); | |
2045 | ||
a67ba386 | 2046 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2047 | return 0; |
a67ba386 MD |
2048 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2049 | && event_notifier->priv->group == event_notifier_enabler->group | |
2050 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2051 | return 1; |
2052 | else | |
2053 | return 0; | |
2054 | } | |
2055 | ||
3c997079 | 2056 | static |
b2bc0bc8 FD |
2057 | struct lttng_enabler_ref *lttng_enabler_ref( |
2058 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2059 | struct lttng_enabler *enabler) |
2060 | { | |
2061 | struct lttng_enabler_ref *enabler_ref; | |
2062 | ||
b2bc0bc8 | 2063 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2064 | if (enabler_ref->ref == enabler) |
2065 | return enabler_ref; | |
2066 | } | |
2067 | return NULL; | |
2068 | } | |
2069 | ||
3c997079 | 2070 | static |
1b917d6b | 2071 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2072 | { |
b2bc0bc8 | 2073 | struct lttng_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2074 | struct lttng_kernel_probe_desc *probe_desc; |
2075 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2076 | int i; |
2077 | struct list_head *probe_list; | |
2078 | ||
2079 | probe_list = lttng_get_probe_list_head(); | |
2080 | /* | |
2081 | * For each probe event, if we find that a probe event matches | |
2082 | * our enabler, create an associated lttng_event if not | |
2083 | * already present. | |
2084 | */ | |
2085 | list_for_each_entry(probe_desc, probe_list, head) { | |
2086 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2087 | int found = 0; | |
2088 | struct hlist_head *head; | |
a67ba386 MD |
2089 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2090 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2091 | |
2092 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2093 | if (!lttng_desc_match_enabler(desc, |
2094 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2095 | continue; |
3c997079 MD |
2096 | |
2097 | /* | |
2098 | * Check if already created. | |
2099 | */ | |
4a11ef1c FD |
2100 | head = utils_borrow_hash_table_bucket( |
2101 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 2102 | desc->event_name); |
a67ba386 MD |
2103 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2104 | if (event_recorder_private->parent.desc == desc | |
2105 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2106 | found = 1; |
2107 | } | |
2108 | if (found) | |
2109 | continue; | |
2110 | ||
2111 | /* | |
2112 | * We need to create an event for this | |
2113 | * event probe. | |
2114 | */ | |
a67ba386 MD |
2115 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2116 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2117 | if (!event_recorder) { | |
5a15f70c | 2118 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2119 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2120 | } |
2121 | } | |
2122 | } | |
2123 | } | |
2124 | ||
b01155ba FD |
2125 | static |
2126 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2127 | { | |
2128 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2129 | struct lttng_kernel_probe_desc *probe_desc; |
2130 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2131 | int i; |
2132 | struct list_head *probe_list; | |
2133 | ||
2134 | probe_list = lttng_get_probe_list_head(); | |
2135 | /* | |
2136 | * For each probe event, if we find that a probe event matches | |
2137 | * our enabler, create an associated lttng_event_notifier if not | |
2138 | * already present. | |
2139 | */ | |
2140 | list_for_each_entry(probe_desc, probe_list, head) { | |
2141 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2142 | int found = 0; | |
2143 | struct hlist_head *head; | |
a67ba386 MD |
2144 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2145 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2146 | |
2147 | desc = probe_desc->event_desc[i]; | |
2148 | if (!lttng_desc_match_enabler(desc, | |
2149 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2150 | continue; | |
2151 | ||
2152 | /* | |
2153 | * Check if already created. | |
2154 | */ | |
2155 | head = utils_borrow_hash_table_bucket( | |
2156 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2157 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2158 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2159 | if (event_notifier_priv->parent.desc == desc | |
2160 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2161 | found = 1; |
2162 | } | |
2163 | if (found) | |
2164 | continue; | |
2165 | ||
2166 | /* | |
2167 | * We need to create a event_notifier for this event probe. | |
2168 | */ | |
2169 | event_notifier = _lttng_event_notifier_create(desc, | |
2170 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2171 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2172 | event_notifier_group, NULL, |
606828e4 | 2173 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2174 | if (IS_ERR(event_notifier)) { |
2175 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2176 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2177 | } |
2178 | } | |
2179 | } | |
2180 | } | |
2181 | ||
33a39a3c | 2182 | static |
1b917d6b | 2183 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2184 | { |
2185 | int ret; | |
2186 | ||
a67ba386 | 2187 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2188 | WARN_ON_ONCE(ret); |
2189 | } | |
2190 | ||
8a8ac9a8 FD |
2191 | static |
2192 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2193 | { | |
2194 | int ret; | |
2195 | ||
a67ba386 | 2196 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2197 | WARN_ON_ONCE(ret); |
a67ba386 | 2198 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2199 | WARN_ON_ONCE(ret); |
2200 | } | |
2201 | ||
33a39a3c | 2202 | /* |
a67ba386 | 2203 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2204 | * tracepoint probes. |
2205 | * Should be called with sessions mutex held. | |
2206 | */ | |
2207 | static | |
b2bc0bc8 | 2208 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2209 | { |
b2bc0bc8 | 2210 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2211 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2212 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2213 | break; |
b4a75708 | 2214 | |
606828e4 | 2215 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2216 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2217 | break; |
b4a75708 | 2218 | |
33a39a3c MD |
2219 | default: |
2220 | WARN_ON_ONCE(1); | |
2221 | break; | |
2222 | } | |
2223 | } | |
2224 | ||
3c997079 | 2225 | /* |
b2bc0bc8 | 2226 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2227 | * and add backward reference from the event to the enabler. |
2228 | * Should be called with sessions mutex held. | |
2229 | */ | |
2230 | static | |
b2bc0bc8 | 2231 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2232 | { |
b2bc0bc8 FD |
2233 | struct lttng_channel *chan = event_enabler->chan; |
2234 | struct lttng_session *session = event_enabler->chan->session; | |
2235 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
a67ba386 | 2236 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2237 | |
606828e4 MD |
2238 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2239 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2240 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2241 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2242 | int enabled = base_enabler->enabled; |
606828e4 | 2243 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2244 | |
606828e4 | 2245 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 MD |
2246 | WRITE_ONCE(chan->syscall_all_entry, enabled); |
2247 | ||
606828e4 | 2248 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 | 2249 | WRITE_ONCE(chan->syscall_all_exit, enabled); |
badfe9f5 MD |
2250 | } |
2251 | ||
3c997079 | 2252 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2253 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2254 | |
b2bc0bc8 | 2255 | /* For each event matching event_enabler in session event list. */ |
a67ba386 MD |
2256 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2257 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 MD |
2258 | struct lttng_enabler_ref *enabler_ref; |
2259 | ||
a67ba386 | 2260 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2261 | continue; |
a67ba386 | 2262 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2263 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2264 | if (!enabler_ref) { |
2265 | /* | |
2266 | * If no backward ref, create it. | |
b2bc0bc8 | 2267 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2268 | */ |
2269 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2270 | if (!enabler_ref) | |
2271 | return -ENOMEM; | |
b2bc0bc8 | 2272 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2273 | list_add(&enabler_ref->node, |
a67ba386 | 2274 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2275 | } |
2276 | ||
f127e61e MD |
2277 | /* |
2278 | * Link filter bytecodes if not linked yet. | |
2279 | */ | |
a67ba386 | 2280 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2281 | lttng_static_ctx, |
a67ba386 | 2282 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2283 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2284 | } |
2285 | return 0; | |
2286 | } | |
2287 | ||
b01155ba | 2288 | /* |
a67ba386 | 2289 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2290 | * tracepoint probes. |
2291 | * Should be called with sessions mutex held. | |
2292 | */ | |
2293 | static | |
2294 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2295 | { | |
2296 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2297 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2298 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2299 | break; | |
b4a75708 | 2300 | |
606828e4 | 2301 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2302 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2303 | break; | |
b4a75708 | 2304 | |
b01155ba FD |
2305 | default: |
2306 | WARN_ON_ONCE(1); | |
2307 | break; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2313 | */ | |
2314 | static | |
8a8ac9a8 FD |
2315 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2316 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2317 | { |
2318 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2319 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2320 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2321 | |
606828e4 MD |
2322 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2323 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2324 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2325 | !strcmp(base_enabler->event_param.name, "*")) { |
2326 | ||
2327 | int enabled = base_enabler->enabled; | |
606828e4 | 2328 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2329 | |
606828e4 | 2330 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2331 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2332 | ||
606828e4 | 2333 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2334 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2335 | ||
2336 | } | |
2337 | ||
b01155ba FD |
2338 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2339 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2340 | ||
2341 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2342 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2343 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2344 | struct lttng_enabler_ref *enabler_ref; |
2345 | ||
2346 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2347 | continue; | |
2348 | ||
a67ba386 | 2349 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2350 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2351 | if (!enabler_ref) { | |
2352 | /* | |
2353 | * If no backward ref, create it. | |
2354 | * Add backward ref from event_notifier to enabler. | |
2355 | */ | |
2356 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2357 | if (!enabler_ref) | |
2358 | return -ENOMEM; | |
2359 | ||
2360 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2361 | event_notifier_enabler); | |
2362 | list_add(&enabler_ref->node, | |
a67ba386 | 2363 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2364 | } |
2365 | ||
2366 | /* | |
2367 | * Link filter bytecodes if not linked yet. | |
2368 | */ | |
a67ba386 MD |
2369 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2370 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2371 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2372 | |
2373 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2374 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2375 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2376 | &event_notifier_enabler->capture_bytecode_head); |
2377 | ||
a67ba386 | 2378 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2379 | } |
2380 | return 0; | |
2381 | } | |
2382 | ||
3c997079 MD |
2383 | /* |
2384 | * Called at module load: connect the probe on all enablers matching | |
2385 | * this event. | |
2386 | * Called with sessions lock held. | |
2387 | */ | |
2388 | int lttng_fix_pending_events(void) | |
2389 | { | |
2390 | struct lttng_session *session; | |
2391 | ||
2392 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2393 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2394 | return 0; |
2395 | } | |
2396 | ||
b01155ba FD |
2397 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2398 | struct lttng_event_notifier_group *event_notifier_group) | |
2399 | { | |
2400 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2401 | ||
2402 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2403 | node) { | |
2404 | if (event_notifier_enabler->base.enabled) | |
2405 | return true; | |
2406 | } | |
2407 | return false; | |
2408 | } | |
2409 | ||
2410 | bool lttng_event_notifier_active(void) | |
2411 | { | |
2412 | struct lttng_event_notifier_group *event_notifier_group; | |
2413 | ||
2414 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2415 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2416 | return true; | |
2417 | } | |
2418 | return false; | |
2419 | } | |
2420 | ||
2421 | int lttng_fix_pending_event_notifiers(void) | |
2422 | { | |
2423 | struct lttng_event_notifier_group *event_notifier_group; | |
2424 | ||
2425 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2426 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2427 | return 0; | |
2428 | } | |
2429 | ||
b2bc0bc8 FD |
2430 | struct lttng_event_enabler *lttng_event_enabler_create( |
2431 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2432 | struct lttng_kernel_abi_event *event_param, |
3c997079 MD |
2433 | struct lttng_channel *chan) |
2434 | { | |
b2bc0bc8 | 2435 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2436 | |
b2bc0bc8 FD |
2437 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2438 | if (!event_enabler) | |
3c997079 | 2439 | return NULL; |
b2bc0bc8 FD |
2440 | event_enabler->base.format_type = format_type; |
2441 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2442 | memcpy(&event_enabler->base.event_param, event_param, | |
2443 | sizeof(event_enabler->base.event_param)); | |
2444 | event_enabler->chan = chan; | |
3c997079 | 2445 | /* ctx left NULL */ |
b2bc0bc8 | 2446 | event_enabler->base.enabled = 0; |
3c997079 | 2447 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2448 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2449 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2450 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2451 | return event_enabler; |
3c997079 MD |
2452 | } |
2453 | ||
b2bc0bc8 | 2454 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2455 | { |
2456 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2457 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2458 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2459 | mutex_unlock(&sessions_mutex); |
2460 | return 0; | |
2461 | } | |
2462 | ||
b2bc0bc8 | 2463 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2464 | { |
2465 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2466 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2467 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2468 | mutex_unlock(&sessions_mutex); |
2469 | return 0; | |
2470 | } | |
2471 | ||
b2bc0bc8 | 2472 | static |
183e8b3a | 2473 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2474 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2475 | { |
89ec2b91 | 2476 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2477 | uint32_t bytecode_len; |
2478 | int ret; | |
2479 | ||
2480 | ret = get_user(bytecode_len, &bytecode->len); | |
2481 | if (ret) | |
2482 | return ret; | |
52cfcdf3 | 2483 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2484 | GFP_KERNEL); |
2485 | if (!bytecode_node) | |
2486 | return -ENOMEM; | |
2487 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2488 | sizeof(*bytecode) + bytecode_len); | |
2489 | if (ret) | |
2490 | goto error_free; | |
b2bc0bc8 | 2491 | |
89ec2b91 | 2492 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2493 | bytecode_node->enabler = enabler; |
2494 | /* Enforce length based on allocated size */ | |
2495 | bytecode_node->bc.len = bytecode_len; | |
2496 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2497 | |
07dfc1d0 MD |
2498 | return 0; |
2499 | ||
2500 | error_free: | |
52cfcdf3 | 2501 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2502 | return ret; |
2503 | } | |
2504 | ||
183e8b3a | 2505 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2506 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2507 | { |
2508 | int ret; | |
183e8b3a | 2509 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2510 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2511 | if (ret) | |
2512 | goto error; | |
2513 | ||
2514 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2515 | return 0; | |
2516 | ||
2517 | error: | |
2518 | return ret; | |
2519 | } | |
2520 | ||
a67ba386 | 2521 | int lttng_event_add_callsite(struct lttng_kernel_event_recorder *event_recorder, |
606828e4 | 2522 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2523 | { |
2524 | ||
a67ba386 | 2525 | switch (event_recorder->priv->parent.instrumentation) { |
606828e4 | 2526 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 2527 | return lttng_uprobes_event_add_callsite(event_recorder, callsite); |
3aed4dca FD |
2528 | default: |
2529 | return -EINVAL; | |
2530 | } | |
2531 | } | |
2532 | ||
3c997079 MD |
2533 | static |
2534 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2535 | { | |
89ec2b91 | 2536 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2537 | |
2538 | /* Destroy filter bytecode */ | |
2539 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2540 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2541 | lttng_kvfree(filter_node); |
07dfc1d0 | 2542 | } |
b2bc0bc8 FD |
2543 | } |
2544 | ||
2545 | static | |
2546 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2547 | { | |
2548 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2549 | |
b2bc0bc8 FD |
2550 | list_del(&event_enabler->node); |
2551 | kfree(event_enabler); | |
3c997079 MD |
2552 | } |
2553 | ||
dffef45d FD |
2554 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2555 | struct lttng_event_notifier_group *event_notifier_group, | |
2556 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2557 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2558 | { |
2559 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2560 | ||
2561 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2562 | if (!event_notifier_enabler) | |
2563 | return NULL; | |
2564 | ||
2565 | event_notifier_enabler->base.format_type = format_type; | |
2566 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2567 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2568 | ||
99f52fcc | 2569 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2570 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2571 | |
8a8ac9a8 FD |
2572 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2573 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2574 | |
2575 | event_notifier_enabler->base.enabled = 0; | |
2576 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2577 | event_notifier_enabler->group = event_notifier_group; | |
2578 | ||
2579 | mutex_lock(&sessions_mutex); | |
2580 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2581 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2582 | |
2583 | mutex_unlock(&sessions_mutex); | |
2584 | ||
2585 | return event_notifier_enabler; | |
2586 | } | |
2587 | ||
2588 | int lttng_event_notifier_enabler_enable( | |
2589 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2590 | { | |
2591 | mutex_lock(&sessions_mutex); | |
2592 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2593 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2594 | mutex_unlock(&sessions_mutex); |
2595 | return 0; | |
2596 | } | |
2597 | ||
2598 | int lttng_event_notifier_enabler_disable( | |
2599 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2600 | { | |
2601 | mutex_lock(&sessions_mutex); | |
2602 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2603 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2604 | mutex_unlock(&sessions_mutex); |
2605 | return 0; | |
2606 | } | |
2607 | ||
183e8b3a | 2608 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2609 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2610 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2611 | { |
2612 | int ret; | |
2613 | ||
183e8b3a | 2614 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2615 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2616 | bytecode); | |
2617 | if (ret) | |
2618 | goto error; | |
2619 | ||
b01155ba | 2620 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2621 | return 0; |
2622 | ||
2623 | error: | |
2624 | return ret; | |
2625 | } | |
2626 | ||
99d223ad FD |
2627 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2628 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2629 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad FD |
2630 | { |
2631 | struct lttng_bytecode_node *bytecode_node; | |
2632 | struct lttng_enabler *enabler = | |
2633 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2634 | uint32_t bytecode_len; | |
2635 | int ret; | |
2636 | ||
2637 | ret = get_user(bytecode_len, &bytecode->len); | |
2638 | if (ret) | |
2639 | return ret; | |
2640 | ||
2641 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2642 | GFP_KERNEL); | |
2643 | if (!bytecode_node) | |
2644 | return -ENOMEM; | |
2645 | ||
2646 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2647 | sizeof(*bytecode) + bytecode_len); | |
2648 | if (ret) | |
2649 | goto error_free; | |
2650 | ||
2651 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2652 | bytecode_node->enabler = enabler; | |
2653 | ||
2654 | /* Enforce length based on allocated size */ | |
2655 | bytecode_node->bc.len = bytecode_len; | |
2656 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2657 | ||
2658 | event_notifier_enabler->num_captures++; | |
2659 | ||
2660 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2661 | goto end; | |
2662 | ||
2663 | error_free: | |
2664 | lttng_kvfree(bytecode_node); | |
2665 | end: | |
2666 | return ret; | |
2667 | } | |
2668 | ||
a67ba386 | 2669 | int lttng_event_notifier_add_callsite(struct lttng_kernel_event_notifier *event_notifier, |
606828e4 | 2670 | struct lttng_kernel_abi_event_callsite __user *callsite) |
9de67196 FD |
2671 | { |
2672 | ||
a67ba386 | 2673 | switch (event_notifier->priv->parent.instrumentation) { |
606828e4 | 2674 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
2675 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, |
2676 | callsite); | |
2677 | default: | |
2678 | return -EINVAL; | |
2679 | } | |
2680 | } | |
2681 | ||
dffef45d FD |
2682 | static |
2683 | void lttng_event_notifier_enabler_destroy( | |
2684 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2685 | { | |
2686 | if (!event_notifier_enabler) { | |
2687 | return; | |
2688 | } | |
2689 | ||
2690 | list_del(&event_notifier_enabler->node); | |
2691 | ||
2692 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2693 | kfree(event_notifier_enabler); | |
2694 | } | |
2695 | ||
3c997079 | 2696 | /* |
b2bc0bc8 | 2697 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2698 | * session. |
2699 | * Should be called with sessions mutex held. | |
2700 | */ | |
2701 | static | |
b2bc0bc8 | 2702 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2703 | { |
b2bc0bc8 | 2704 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2705 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2706 | |
b2bc0bc8 FD |
2707 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2708 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2709 | /* |
2710 | * For each event, if at least one of its enablers is enabled, | |
2711 | * and its channel and session transient states are enabled, we | |
2712 | * enable the event, else we disable it. | |
2713 | */ | |
a67ba386 MD |
2714 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2715 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 | 2716 | struct lttng_enabler_ref *enabler_ref; |
07dfc1d0 MD |
2717 | struct lttng_bytecode_runtime *runtime; |
2718 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2719 | |
a67ba386 | 2720 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2721 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2722 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2723 | /* Enable events */ |
2724 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2725 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2726 | if (enabler_ref->ref->enabled) { |
2727 | enabled = 1; | |
2728 | break; | |
2729 | } | |
2730 | } | |
4ecb5ad5 | 2731 | break; |
b4a75708 | 2732 | |
4ecb5ad5 | 2733 | default: |
3c997079 MD |
2734 | /* Not handled with lazy sync. */ |
2735 | continue; | |
2736 | } | |
2737 | /* | |
2738 | * Enabled state is based on union of enablers, with | |
2739 | * intesection of session and channel transient enable | |
2740 | * states. | |
2741 | */ | |
a67ba386 | 2742 | enabled = enabled && session->tstate && event_recorder->chan->tstate; |
3c997079 | 2743 | |
a67ba386 | 2744 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2745 | /* |
2746 | * Sync tracepoint registration with event enabled | |
2747 | * state. | |
2748 | */ | |
2749 | if (enabled) { | |
a67ba386 | 2750 | register_event(event_recorder); |
3c997079 | 2751 | } else { |
a67ba386 | 2752 | _lttng_event_unregister(event_recorder); |
3c997079 | 2753 | } |
07dfc1d0 MD |
2754 | |
2755 | /* Check if has enablers without bytecode enabled */ | |
2756 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2757 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2758 | if (enabler_ref->ref->enabled |
2759 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2760 | has_enablers_without_bytecode = 1; | |
2761 | break; | |
2762 | } | |
2763 | } | |
a67ba386 | 2764 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
07dfc1d0 MD |
2765 | has_enablers_without_bytecode; |
2766 | ||
2767 | /* Enable filters */ | |
2768 | list_for_each_entry(runtime, | |
a67ba386 | 2769 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) |
0b365677 | 2770 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2771 | } |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * Apply enablers to session events, adding events to session if need | |
2776 | * be. It is required after each modification applied to an active | |
2777 | * session, and right before session "start". | |
2778 | * "lazy" sync means we only sync if required. | |
2779 | * Should be called with sessions mutex held. | |
2780 | */ | |
2781 | static | |
b2bc0bc8 | 2782 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2783 | { |
2784 | /* We can skip if session is not active */ | |
2785 | if (!session->active) | |
2786 | return; | |
b2bc0bc8 | 2787 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2788 | } |
2789 | ||
b01155ba FD |
2790 | static |
2791 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2792 | { | |
2793 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2794 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2795 | |
2796 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2797 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2798 | ||
2799 | /* | |
2800 | * For each event_notifier, if at least one of its enablers is enabled, | |
2801 | * we enable the event_notifier, else we disable it. | |
2802 | */ | |
a67ba386 MD |
2803 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2804 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2805 | struct lttng_enabler_ref *enabler_ref; |
2806 | struct lttng_bytecode_runtime *runtime; | |
2807 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2808 | ||
a67ba386 | 2809 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2810 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2811 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2812 | /* Enable event_notifiers */ |
2813 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2814 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2815 | if (enabler_ref->ref->enabled) { |
2816 | enabled = 1; | |
2817 | break; | |
2818 | } | |
2819 | } | |
2820 | break; | |
b4a75708 | 2821 | |
b01155ba FD |
2822 | default: |
2823 | /* Not handled with sync. */ | |
2824 | continue; | |
2825 | } | |
2826 | ||
a67ba386 | 2827 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2828 | /* |
2829 | * Sync tracepoint registration with event_notifier enabled | |
2830 | * state. | |
2831 | */ | |
2832 | if (enabled) { | |
a67ba386 | 2833 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2834 | register_event_notifier(event_notifier); |
2835 | } else { | |
a67ba386 | 2836 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2837 | _lttng_event_notifier_unregister(event_notifier); |
2838 | } | |
2839 | ||
2840 | /* Check if has enablers without bytecode enabled */ | |
2841 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2842 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2843 | if (enabler_ref->ref->enabled |
2844 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2845 | has_enablers_without_bytecode = 1; | |
2846 | break; | |
2847 | } | |
2848 | } | |
a67ba386 | 2849 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
b01155ba FD |
2850 | has_enablers_without_bytecode; |
2851 | ||
2852 | /* Enable filters */ | |
2853 | list_for_each_entry(runtime, | |
a67ba386 | 2854 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) |
0b365677 | 2855 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2856 | |
2857 | /* Enable captures */ | |
2858 | list_for_each_entry(runtime, | |
a67ba386 | 2859 | &event_notifier_priv->capture_bytecode_runtime_head, node) |
99d223ad | 2860 | lttng_bytecode_capture_sync_state(runtime); |
c3eddb2e | 2861 | |
a67ba386 | 2862 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier_priv->num_captures); |
b01155ba FD |
2863 | } |
2864 | } | |
2865 | ||
1ec3f75a | 2866 | /* |
d83004aa JD |
2867 | * Serialize at most one packet worth of metadata into a metadata |
2868 | * channel. | |
92d9f5e6 MD |
2869 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2870 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2871 | * allows us to do racy operations such as looking for remaining space left in | |
2872 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2873 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2874 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2875 | * Returns the number of bytes written in the channel, 0 if no data |
2876 | * was written and a negative value on error. | |
1ec3f75a | 2877 | */ |
b3b8072b | 2878 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2879 | struct channel *chan, bool *coherent) |
d83004aa JD |
2880 | { |
2881 | struct lib_ring_buffer_ctx ctx; | |
2882 | int ret = 0; | |
2883 | size_t len, reserve_len; | |
2884 | ||
f613e3e6 | 2885 | /* |
92d9f5e6 MD |
2886 | * Ensure we support mutiple get_next / put sequences followed by |
2887 | * put_next. The metadata cache lock protects reading the metadata | |
2888 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2889 | * "flush" operations on the buffer invoked by different processes. | |
2890 | * Moreover, since the metadata cache memory can be reallocated, we | |
2891 | * need to have exclusive access against updates even though we only | |
2892 | * read it. | |
f613e3e6 | 2893 | */ |
92d9f5e6 | 2894 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2895 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2896 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2897 | goto end; |
f613e3e6 | 2898 | |
9616f0bf JD |
2899 | /* Metadata regenerated, change the version. */ |
2900 | if (stream->metadata_cache->version != stream->version) | |
2901 | stream->version = stream->metadata_cache->version; | |
2902 | ||
d83004aa | 2903 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2904 | stream->metadata_in; |
9de2c215 | 2905 | if (!len) |
de23d59d | 2906 | goto end; |
d83004aa | 2907 | reserve_len = min_t(size_t, |
b3b8072b | 2908 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2909 | len); |
b3b8072b | 2910 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2911 | sizeof(char), -1); |
2912 | /* | |
2913 | * If reservation failed, return an error to the caller. | |
2914 | */ | |
b3b8072b | 2915 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2916 | if (ret != 0) { |
2917 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2918 | stream->coherent = false; |
d83004aa JD |
2919 | goto end; |
2920 | } | |
b3b8072b | 2921 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2922 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2923 | reserve_len); |
b3b8072b | 2924 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2925 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2926 | if (reserve_len < len) |
8b97fd42 MD |
2927 | stream->coherent = false; |
2928 | else | |
2929 | stream->coherent = true; | |
d83004aa JD |
2930 | ret = reserve_len; |
2931 | ||
2932 | end: | |
8b97fd42 MD |
2933 | if (coherent) |
2934 | *coherent = stream->coherent; | |
92d9f5e6 | 2935 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2936 | return ret; |
2937 | } | |
2938 | ||
8b97fd42 MD |
2939 | static |
2940 | void lttng_metadata_begin(struct lttng_session *session) | |
2941 | { | |
3e75e2a7 MD |
2942 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2943 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2944 | } |
2945 | ||
2946 | static | |
2947 | void lttng_metadata_end(struct lttng_session *session) | |
2948 | { | |
3e75e2a7 MD |
2949 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2950 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2951 | struct lttng_metadata_stream *stream; | |
2952 | ||
3e75e2a7 MD |
2953 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2954 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2955 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2956 | } |
8b97fd42 MD |
2957 | } |
2958 | ||
d83004aa JD |
2959 | /* |
2960 | * Write the metadata to the metadata cache. | |
2961 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2962 | * The metadata cache lock protects us from concurrent read access from |
2963 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2964 | * The content of the printf is printed as a single atomic metadata |
2965 | * transaction. | |
d83004aa | 2966 | */ |
a90917c3 | 2967 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2968 | const char *fmt, ...) |
2969 | { | |
c099397a | 2970 | char *str; |
d83004aa | 2971 | size_t len; |
c099397a MD |
2972 | va_list ap; |
2973 | ||
585e5dcc | 2974 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2975 | |
2976 | va_start(ap, fmt); | |
2977 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2978 | va_end(ap); | |
2979 | if (!str) | |
2980 | return -ENOMEM; | |
2981 | ||
1ec3f75a | 2982 | len = strlen(str); |
3e75e2a7 | 2983 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2984 | if (session->metadata_cache->metadata_written + len > |
2985 | session->metadata_cache->cache_alloc) { | |
2986 | char *tmp_cache_realloc; | |
2987 | unsigned int tmp_cache_alloc_size; | |
2988 | ||
2989 | tmp_cache_alloc_size = max_t(unsigned int, | |
2990 | session->metadata_cache->cache_alloc + len, | |
2991 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2992 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2993 | if (!tmp_cache_realloc) |
2994 | goto err; | |
a606b6e8 ML |
2995 | if (session->metadata_cache->data) { |
2996 | memcpy(tmp_cache_realloc, | |
2997 | session->metadata_cache->data, | |
2998 | session->metadata_cache->cache_alloc); | |
2999 | vfree(session->metadata_cache->data); | |
3000 | } | |
3001 | ||
d83004aa JD |
3002 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3003 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3004 | } |
d83004aa JD |
3005 | memcpy(session->metadata_cache->data + |
3006 | session->metadata_cache->metadata_written, | |
3007 | str, len); | |
3008 | session->metadata_cache->metadata_written += len; | |
c099397a | 3009 | kfree(str); |
d83004aa | 3010 | |
d83004aa JD |
3011 | return 0; |
3012 | ||
3013 | err: | |
3014 | kfree(str); | |
3015 | return -ENOMEM; | |
c099397a MD |
3016 | } |
3017 | ||
f513b2bf MD |
3018 | static |
3019 | int print_tabs(struct lttng_session *session, size_t nesting) | |
3020 | { | |
3021 | size_t i; | |
3022 | ||
3023 | for (i = 0; i < nesting; i++) { | |
3024 | int ret; | |
3025 | ||
3026 | ret = lttng_metadata_printf(session, " "); | |
3027 | if (ret) { | |
3028 | return ret; | |
3029 | } | |
3030 | } | |
3031 | return 0; | |
3032 | } | |
3033 | ||
ceabb767 MD |
3034 | static |
3035 | int lttng_field_name_statedump(struct lttng_session *session, | |
437d5aa5 | 3036 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3037 | size_t nesting) |
3038 | { | |
3039 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3040 | } | |
3041 | ||
3042 | static | |
3043 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3044 | const struct lttng_kernel_type_integer *type, |
3045 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3046 | size_t nesting) |
3047 | { | |
3048 | int ret; | |
3049 | ||
ceabb767 MD |
3050 | ret = print_tabs(session, nesting); |
3051 | if (ret) | |
3052 | return ret; | |
3053 | ret = lttng_metadata_printf(session, | |
3054 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3055 | type->size, |
3056 | type->alignment, | |
3057 | type->signedness, | |
3058 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3059 | ? "none" |
437d5aa5 | 3060 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3061 | ? "UTF8" |
3062 | : "ASCII", | |
437d5aa5 | 3063 | type->base, |
ceabb767 | 3064 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3065 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3066 | #else |
437d5aa5 | 3067 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3068 | #endif |
3069 | ); | |
3070 | return ret; | |
3071 | } | |
3072 | ||
f513b2bf MD |
3073 | /* |
3074 | * Must be called with sessions_mutex held. | |
3075 | */ | |
3076 | static | |
3077 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3078 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3079 | size_t nesting) |
3080 | { | |
3081 | int ret; | |
3082 | uint32_t i, nr_fields; | |
ceabb767 MD |
3083 | unsigned int alignment; |
3084 | ||
f513b2bf MD |
3085 | ret = print_tabs(session, nesting); |
3086 | if (ret) | |
3087 | return ret; | |
3088 | ret = lttng_metadata_printf(session, | |
3089 | "struct {\n"); | |
3090 | if (ret) | |
3091 | return ret; | |
437d5aa5 | 3092 | nr_fields = type->nr_fields; |
f513b2bf | 3093 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3094 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3095 | |
437d5aa5 | 3096 | iter_field = type->fields[i]; |
f513b2bf MD |
3097 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3098 | if (ret) | |
3099 | return ret; | |
3100 | } | |
3101 | ret = print_tabs(session, nesting); | |
3102 | if (ret) | |
3103 | return ret; | |
437d5aa5 | 3104 | alignment = type->alignment; |
ceabb767 MD |
3105 | if (alignment) { |
3106 | ret = lttng_metadata_printf(session, | |
3107 | "} align(%u)", | |
3108 | alignment); | |
3109 | } else { | |
3110 | ret = lttng_metadata_printf(session, | |
3111 | "}"); | |
3112 | } | |
f513b2bf MD |
3113 | return ret; |
3114 | } | |
3115 | ||
3116 | /* | |
3117 | * Must be called with sessions_mutex held. | |
3118 | */ | |
3119 | static | |
ceabb767 | 3120 | int _lttng_struct_field_statedump(struct lttng_session *session, |
437d5aa5 | 3121 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3122 | size_t nesting) |
3123 | { | |
3124 | int ret; | |
3125 | ||
3126 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3127 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3128 | if (ret) |
3129 | return ret; | |
ceabb767 | 3130 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3131 | } |
3132 | ||
65c85aa6 MD |
3133 | /* |
3134 | * Must be called with sessions_mutex held. | |
3135 | */ | |
3136 | static | |
3137 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3138 | const struct lttng_kernel_type_variant *type, |
65c85aa6 MD |
3139 | size_t nesting) |
3140 | { | |
3141 | int ret; | |
3142 | uint32_t i, nr_choices; | |
3143 | ||
ceabb767 MD |
3144 | /* |
3145 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3146 | */ | |
437d5aa5 | 3147 | if (type->alignment != 0) |
ceabb767 | 3148 | return -EINVAL; |
65c85aa6 MD |
3149 | ret = print_tabs(session, nesting); |
3150 | if (ret) | |
3151 | return ret; | |
3152 | ret = lttng_metadata_printf(session, | |
3153 | "variant <_%s> {\n", | |
437d5aa5 | 3154 | type->tag_name); |
65c85aa6 MD |
3155 | if (ret) |
3156 | return ret; | |
437d5aa5 | 3157 | nr_choices = type->nr_choices; |
65c85aa6 | 3158 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3159 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3160 | |
437d5aa5 | 3161 | iter_field = type->choices[i]; |
65c85aa6 MD |
3162 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3163 | if (ret) | |
3164 | return ret; | |
3165 | } | |
3166 | ret = print_tabs(session, nesting); | |
3167 | if (ret) | |
3168 | return ret; | |
3169 | ret = lttng_metadata_printf(session, | |
3170 | "}"); | |
3171 | return ret; | |
3172 | } | |
3173 | ||
3174 | /* | |
3175 | * Must be called with sessions_mutex held. | |
3176 | */ | |
3177 | static | |
ceabb767 | 3178 | int _lttng_variant_field_statedump(struct lttng_session *session, |
437d5aa5 | 3179 | const struct lttng_kernel_event_field *field, |
65c85aa6 MD |
3180 | size_t nesting) |
3181 | { | |
3182 | int ret; | |
3183 | ||
3184 | ret = _lttng_variant_type_statedump(session, | |
437d5aa5 | 3185 | lttng_kernel_get_type_variant(field->type), nesting); |
65c85aa6 MD |
3186 | if (ret) |
3187 | return ret; | |
ceabb767 | 3188 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3189 | } |
3190 | ||
f513b2bf MD |
3191 | /* |
3192 | * Must be called with sessions_mutex held. | |
3193 | */ | |
3194 | static | |
ceabb767 | 3195 | int _lttng_array_field_statedump(struct lttng_session *session, |
437d5aa5 | 3196 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3197 | size_t nesting) |
3198 | { | |
3199 | int ret; | |
437d5aa5 MD |
3200 | const struct lttng_kernel_type_array *array_type; |
3201 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3202 | |
437d5aa5 MD |
3203 | array_type = lttng_kernel_get_type_array(field->type); |
3204 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3205 | |
437d5aa5 | 3206 | if (array_type->alignment) { |
ceabb767 | 3207 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3208 | if (ret) |
3209 | return ret; | |
ceabb767 MD |
3210 | ret = lttng_metadata_printf(session, |
3211 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3212 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3213 | field->name); |
3214 | if (ret) | |
3215 | return ret; | |
3216 | } | |
3217 | /* | |
3218 | * Nested compound types: Only array of structures and variants are | |
3219 | * currently supported. | |
3220 | */ | |
437d5aa5 | 3221 | elem_type = array_type->elem_type; |
12bb2edb MD |
3222 | switch (elem_type->type) { |
3223 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3224 | case lttng_kernel_type_struct: |
3225 | case lttng_kernel_type_variant: | |
3226 | ret = _lttng_type_statedump(session, elem_type, | |
3227 | array_type->encoding, nesting); | |
65c85aa6 MD |
3228 | if (ret) |
3229 | return ret; | |
3230 | break; | |
ceabb767 | 3231 | |
f513b2bf MD |
3232 | default: |
3233 | return -EINVAL; | |
3234 | } | |
3235 | ret = lttng_metadata_printf(session, | |
3236 | " _%s[%u];\n", | |
3237 | field->name, | |
437d5aa5 | 3238 | array_type->length); |
f513b2bf MD |
3239 | return ret; |
3240 | } | |
3241 | ||
3242 | /* | |
3243 | * Must be called with sessions_mutex held. | |
3244 | */ | |
3245 | static | |
ceabb767 | 3246 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
437d5aa5 | 3247 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3248 | size_t nesting) |
3249 | { | |
3250 | int ret; | |
3251 | const char *length_name; | |
437d5aa5 MD |
3252 | const struct lttng_kernel_type_sequence *sequence_type; |
3253 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3254 | |
437d5aa5 MD |
3255 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3256 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3257 | |
437d5aa5 | 3258 | length_name = sequence_type->length_name; |
ceabb767 | 3259 | |
437d5aa5 | 3260 | if (sequence_type->alignment) { |
ceabb767 | 3261 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3262 | if (ret) |
3263 | return ret; | |
ceabb767 MD |
3264 | ret = lttng_metadata_printf(session, |
3265 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3266 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3267 | field->name); |
3268 | if (ret) | |
3269 | return ret; | |
3270 | } | |
3271 | ||
3272 | /* | |
3273 | * Nested compound types: Only array of structures and variants are | |
3274 | * currently supported. | |
3275 | */ | |
437d5aa5 | 3276 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3277 | switch (elem_type->type) { |
3278 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3279 | case lttng_kernel_type_struct: |
3280 | case lttng_kernel_type_variant: | |
3281 | ret = _lttng_type_statedump(session, elem_type, | |
3282 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3283 | if (ret) |
3284 | return ret; | |
3285 | break; | |
ceabb767 | 3286 | |
f513b2bf MD |
3287 | default: |
3288 | return -EINVAL; | |
3289 | } | |
3290 | ret = lttng_metadata_printf(session, | |
3291 | " _%s[ _%s ];\n", | |
3292 | field->name, | |
437d5aa5 | 3293 | sequence_type->length_name); |
f513b2bf MD |
3294 | return ret; |
3295 | } | |
3296 | ||
141ddf28 MD |
3297 | /* |
3298 | * Must be called with sessions_mutex held. | |
3299 | */ | |
3300 | static | |
ceabb767 | 3301 | int _lttng_enum_type_statedump(struct lttng_session *session, |
437d5aa5 | 3302 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3303 | size_t nesting) |
3304 | { | |
d96a4a7a | 3305 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3306 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3307 | int ret; |
3308 | unsigned int i, nr_entries; | |
3309 | ||
437d5aa5 | 3310 | container_type = type->container_type; |
12bb2edb | 3311 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3312 | ret = -EINVAL; |
3313 | goto end; | |
3314 | } | |
437d5aa5 | 3315 | enum_desc = type->desc; |
141ddf28 MD |
3316 | nr_entries = enum_desc->nr_entries; |
3317 | ||
3318 | ret = print_tabs(session, nesting); | |
3319 | if (ret) | |
3320 | goto end; | |
ceabb767 MD |
3321 | ret = lttng_metadata_printf(session, "enum : "); |
3322 | if (ret) | |
3323 | goto end; | |
437d5aa5 MD |
3324 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3325 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3326 | if (ret) |
ceabb767 MD |
3327 | goto end; |
3328 | ret = lttng_metadata_printf(session, " {\n"); | |
3329 | if (ret) | |
3330 | goto end; | |
141ddf28 MD |
3331 | /* Dump all entries */ |
3332 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3333 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3334 | int j, len; |
3335 | ||
3336 | ret = print_tabs(session, nesting + 1); | |
3337 | if (ret) | |
3338 | goto end; | |
3339 | ret = lttng_metadata_printf(session, | |
3340 | "\""); | |
3341 | if (ret) | |
3342 | goto end; | |
3343 | len = strlen(entry->string); | |
3344 | /* Escape the character '"' */ | |
3345 | for (j = 0; j < len; j++) { | |
3346 | char c = entry->string[j]; | |
3347 | ||
3348 | switch (c) { | |
3349 | case '"': | |
3350 | ret = lttng_metadata_printf(session, | |
3351 | "\\\""); | |
3352 | break; | |
3353 | case '\\': | |
3354 | ret = lttng_metadata_printf(session, | |
3355 | "\\\\"); | |
3356 | break; | |
3357 | default: | |
3358 | ret = lttng_metadata_printf(session, | |
3359 | "%c", c); | |
3360 | break; | |
3361 | } | |
3362 | if (ret) | |
3363 | goto end; | |
3364 | } | |
08ad1061 PP |
3365 | ret = lttng_metadata_printf(session, "\""); |
3366 | if (ret) | |
3367 | goto end; | |
3368 | ||
3369 | if (entry->options.is_auto) { | |
3370 | ret = lttng_metadata_printf(session, ",\n"); | |
3371 | if (ret) | |
3372 | goto end; | |
141ddf28 | 3373 | } else { |
7c559490 MD |
3374 | ret = lttng_metadata_printf(session, |
3375 | " = "); | |
3376 | if (ret) | |
3377 | goto end; | |
3378 | if (entry->start.signedness) | |
141ddf28 | 3379 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3380 | "%lld", (long long) entry->start.value); |
3381 | else | |
3382 | ret = lttng_metadata_printf(session, | |
3383 | "%llu", entry->start.value); | |
3384 | if (ret) | |
3385 | goto end; | |
3386 | if (entry->start.signedness == entry->end.signedness && | |
3387 | entry->start.value | |
3388 | == entry->end.value) { | |
141ddf28 | 3389 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3390 | ",\n"); |
3391 | } else { | |
3392 | if (entry->end.signedness) { | |
3393 | ret = lttng_metadata_printf(session, | |
3394 | " ... %lld,\n", | |
3395 | (long long) entry->end.value); | |
3396 | } else { | |
3397 | ret = lttng_metadata_printf(session, | |
3398 | " ... %llu,\n", | |
3399 | entry->end.value); | |
3400 | } | |
141ddf28 | 3401 | } |
7c559490 MD |
3402 | if (ret) |
3403 | goto end; | |
141ddf28 | 3404 | } |
141ddf28 MD |
3405 | } |
3406 | ret = print_tabs(session, nesting); | |
3407 | if (ret) | |
3408 | goto end; | |
ceabb767 | 3409 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3410 | end: |
3411 | return ret; | |
3412 | } | |
3413 | ||
d83004aa JD |
3414 | /* |
3415 | * Must be called with sessions_mutex held. | |
3416 | */ | |
c099397a | 3417 | static |
ceabb767 | 3418 | int _lttng_enum_field_statedump(struct lttng_session *session, |
437d5aa5 | 3419 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3420 | size_t nesting) |
3421 | { | |
3422 | int ret; | |
437d5aa5 | 3423 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3424 | |
437d5aa5 MD |
3425 | enum_type = lttng_kernel_get_type_enum(field->type); |
3426 | WARN_ON_ONCE(!enum_type); | |
3427 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3428 | if (ret) |
3429 | return ret; | |
3430 | return lttng_field_name_statedump(session, field, nesting); | |
3431 | } | |
3432 | ||
3433 | static | |
3434 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3435 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3436 | size_t nesting) |
3437 | { | |
3438 | int ret; | |
3439 | ||
437d5aa5 MD |
3440 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3441 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3442 | if (ret) |
3443 | return ret; | |
3444 | return lttng_field_name_statedump(session, field, nesting); | |
3445 | } | |
3446 | ||
3447 | static | |
3448 | int _lttng_string_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3449 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3450 | size_t nesting) |
3451 | { | |
3452 | int ret; | |
3453 | ||
ceabb767 MD |
3454 | /* Default encoding is UTF8 */ |
3455 | ret = print_tabs(session, nesting); | |
3456 | if (ret) | |
3457 | return ret; | |
3458 | ret = lttng_metadata_printf(session, | |
3459 | "string%s", | |
437d5aa5 | 3460 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3461 | " { encoding = ASCII; }" : ""); |
3462 | return ret; | |
3463 | } | |
3464 | ||
3465 | static | |
3466 | int _lttng_string_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3467 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3468 | size_t nesting) |
ceabb767 | 3469 | { |
437d5aa5 | 3470 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3471 | int ret; |
3472 | ||
437d5aa5 MD |
3473 | string_type = lttng_kernel_get_type_string(field->type); |
3474 | WARN_ON_ONCE(!string_type); | |
3475 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3476 | if (ret) |
3477 | return ret; | |
3478 | return lttng_field_name_statedump(session, field, nesting); | |
3479 | } | |
3480 | ||
3481 | /* | |
3482 | * Must be called with sessions_mutex held. | |
3483 | */ | |
3484 | static | |
3485 | int _lttng_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3486 | const struct lttng_kernel_type_common *type, |
3487 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3488 | size_t nesting) |
c099397a | 3489 | { |
c099397a | 3490 | int ret = 0; |
c099397a | 3491 | |
12bb2edb MD |
3492 | switch (type->type) { |
3493 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3494 | ret = _lttng_integer_type_statedump(session, |
3495 | lttng_kernel_get_type_integer(type), | |
3496 | parent_encoding, nesting); | |
8070f5c0 | 3497 | break; |
437d5aa5 MD |
3498 | case lttng_kernel_type_enum: |
3499 | ret = _lttng_enum_type_statedump(session, | |
3500 | lttng_kernel_get_type_enum(type), | |
3501 | nesting); | |
8070f5c0 | 3502 | break; |
12bb2edb | 3503 | case lttng_kernel_type_string: |
437d5aa5 MD |
3504 | ret = _lttng_string_type_statedump(session, |
3505 | lttng_kernel_get_type_string(type), | |
3506 | nesting); | |
ceabb767 | 3507 | break; |
437d5aa5 MD |
3508 | case lttng_kernel_type_struct: |
3509 | ret = _lttng_struct_type_statedump(session, | |
3510 | lttng_kernel_get_type_struct(type), | |
3511 | nesting); | |
8070f5c0 | 3512 | break; |
437d5aa5 MD |
3513 | case lttng_kernel_type_variant: |
3514 | ret = _lttng_variant_type_statedump(session, | |
3515 | lttng_kernel_get_type_variant(type), | |
3516 | nesting); | |
ceabb767 MD |
3517 | break; |
3518 | ||
3519 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3520 | case lttng_kernel_type_array: |
3521 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3522 | default: |
3523 | WARN_ON_ONCE(1); | |
3524 | return -EINVAL; | |
8070f5c0 | 3525 | } |
ceabb767 MD |
3526 | return ret; |
3527 | } | |
8070f5c0 | 3528 | |
ceabb767 MD |
3529 | /* |
3530 | * Must be called with sessions_mutex held. | |
3531 | */ | |
3532 | static | |
3533 | int _lttng_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3534 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3535 | size_t nesting) |
3536 | { | |
3537 | int ret = 0; | |
27d2368e | 3538 | |
437d5aa5 | 3539 | switch (field->type->type) { |
12bb2edb | 3540 | case lttng_kernel_type_integer: |
ceabb767 MD |
3541 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3542 | break; | |
437d5aa5 | 3543 | case lttng_kernel_type_enum: |
ceabb767 | 3544 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3545 | break; |
12bb2edb | 3546 | case lttng_kernel_type_string: |
ceabb767 | 3547 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3548 | break; |
437d5aa5 | 3549 | case lttng_kernel_type_struct: |
ceabb767 | 3550 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3551 | break; |
437d5aa5 | 3552 | case lttng_kernel_type_array: |
ceabb767 | 3553 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3554 | break; |
437d5aa5 | 3555 | case lttng_kernel_type_sequence: |
ceabb767 | 3556 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3557 | break; |
437d5aa5 | 3558 | case lttng_kernel_type_variant: |
ceabb767 | 3559 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3560 | break; |
f513b2bf | 3561 | |
8070f5c0 MD |
3562 | default: |
3563 | WARN_ON_ONCE(1); | |
3564 | return -EINVAL; | |
3565 | } | |
3566 | return ret; | |
3567 | } | |
3568 | ||
3569 | static | |
a90917c3 | 3570 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
437d5aa5 | 3571 | struct lttng_kernel_ctx *ctx) |
8070f5c0 MD |
3572 | { |
3573 | int ret = 0; | |
3574 | int i; | |
3575 | ||
3576 | if (!ctx) | |
3577 | return 0; | |
3578 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3579 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3580 | |
437d5aa5 | 3581 | ret = _lttng_field_statedump(session, field->event_field, 2); |
8070f5c0 MD |
3582 | if (ret) |
3583 | return ret; | |
3584 | } | |
3585 | return ret; | |
3586 | } | |
3587 | ||
3588 | static | |
a90917c3 | 3589 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
a67ba386 | 3590 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3591 | { |
a67ba386 | 3592 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3593 | int ret = 0; |
3594 | int i; | |
3595 | ||
3596 | for (i = 0; i < desc->nr_fields; i++) { | |
437d5aa5 | 3597 | const struct lttng_kernel_event_field *field = desc->fields[i]; |
8070f5c0 | 3598 | |
f513b2bf | 3599 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3600 | if (ret) |
3601 | return ret; | |
c099397a MD |
3602 | } |
3603 | return ret; | |
3604 | } | |
3605 | ||
d83004aa JD |
3606 | /* |
3607 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3608 | * The entire event metadata is printed as a single atomic metadata |
3609 | * transaction. | |
d83004aa | 3610 | */ |
c099397a | 3611 | static |
a90917c3 MD |
3612 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3613 | struct lttng_channel *chan, | |
a67ba386 | 3614 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3615 | { |
3616 | int ret = 0; | |
3617 | ||
a67ba386 | 3618 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3619 | return 0; |
d83004aa | 3620 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3621 | return 0; |
3622 | ||
8b97fd42 MD |
3623 | lttng_metadata_begin(session); |
3624 | ||
c099397a MD |
3625 | ret = lttng_metadata_printf(session, |
3626 | "event {\n" | |
ae734547 | 3627 | " name = \"%s\";\n" |
c099397a | 3628 | " id = %u;\n" |
b9074a1b | 3629 | " stream_id = %u;\n", |
a67ba386 MD |
3630 | event_recorder->priv->parent.desc->event_name, |
3631 | event_recorder->priv->id, | |
3632 | event_recorder->chan->id); | |
c099397a MD |
3633 | if (ret) |
3634 | goto end; | |
3635 | ||
8070f5c0 | 3636 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3637 | " fields := struct {\n" |
3638 | ); | |
3639 | if (ret) | |
3640 | goto end; | |
3641 | ||
a67ba386 | 3642 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3643 | if (ret) |
3644 | goto end; | |
3645 | ||
3646 | /* | |
3647 | * LTTng space reservation can only reserve multiples of the | |
3648 | * byte size. | |
3649 | */ | |
3650 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3651 | " };\n" |
3652 | "};\n\n"); | |
c099397a MD |
3653 | if (ret) |
3654 | goto end; | |
3655 | ||
a67ba386 | 3656 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3657 | end: |
8b97fd42 | 3658 | lttng_metadata_end(session); |
c099397a MD |
3659 | return ret; |
3660 | ||
3661 | } | |
3662 | ||
d83004aa JD |
3663 | /* |
3664 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3665 | * The entire channel metadata is printed as a single atomic metadata |
3666 | * transaction. | |
d83004aa | 3667 | */ |
c099397a | 3668 | static |
a90917c3 MD |
3669 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3670 | struct lttng_channel *chan) | |
c099397a MD |
3671 | { |
3672 | int ret = 0; | |
3673 | ||
585e5dcc | 3674 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3675 | return 0; |
d83004aa JD |
3676 | |
3677 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3678 | return 0; |
3679 | ||
8b97fd42 MD |
3680 | lttng_metadata_begin(session); |
3681 | ||
c099397a MD |
3682 | WARN_ON_ONCE(!chan->header_type); |
3683 | ret = lttng_metadata_printf(session, | |
3684 | "stream {\n" | |
3685 | " id = %u;\n" | |
9115fbdc | 3686 | " event.header := %s;\n" |
b9074a1b | 3687 | " packet.context := struct packet_context;\n", |
c099397a MD |
3688 | chan->id, |
3689 | chan->header_type == 1 ? "struct event_header_compact" : | |
3690 | "struct event_header_large"); | |
3691 | if (ret) | |
3692 | goto end; | |
3693 | ||
b9074a1b MD |
3694 | if (chan->ctx) { |
3695 | ret = lttng_metadata_printf(session, | |
3696 | " event.context := struct {\n"); | |
3697 | if (ret) | |
3698 | goto end; | |
3699 | } | |
a90917c3 | 3700 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3701 | if (ret) |
3702 | goto end; | |
b9074a1b MD |
3703 | if (chan->ctx) { |
3704 | ret = lttng_metadata_printf(session, | |
3705 | " };\n"); | |
3706 | if (ret) | |
3707 | goto end; | |
3708 | } | |
8070f5c0 MD |
3709 | |
3710 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3711 | "};\n\n"); |
8070f5c0 | 3712 | |
c099397a MD |
3713 | chan->metadata_dumped = 1; |
3714 | end: | |
8b97fd42 | 3715 | lttng_metadata_end(session); |
c099397a MD |
3716 | return ret; |
3717 | } | |
3718 | ||
d83004aa JD |
3719 | /* |
3720 | * Must be called with sessions_mutex held. | |
3721 | */ | |
9115fbdc | 3722 | static |
a90917c3 | 3723 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3724 | { |
3725 | return lttng_metadata_printf(session, | |
3726 | "struct packet_context {\n" | |
a3ccff4f MD |
3727 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3728 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3729 | " uint64_t content_size;\n" |
3730 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3731 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3732 | " unsigned long events_discarded;\n" |
9115fbdc | 3733 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3734 | "};\n\n" |
9115fbdc MD |
3735 | ); |
3736 | } | |
3737 | ||
3738 | /* | |
3739 | * Compact header: | |
3740 | * id: range: 0 - 30. | |
3741 | * id 31 is reserved to indicate an extended header. | |
3742 | * | |
3743 | * Large header: | |
3744 | * id: range: 0 - 65534. | |
3745 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3746 | * |
3747 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3748 | */ |
3749 | static | |
a90917c3 | 3750 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3751 | { |
3752 | return lttng_metadata_printf(session, | |
3753 | "struct event_header_compact {\n" | |
3754 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3755 | " variant <id> {\n" | |
3756 | " struct {\n" | |
a3ccff4f | 3757 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3758 | " } compact;\n" |
3759 | " struct {\n" | |
3760 | " uint32_t id;\n" | |
a3ccff4f | 3761 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3762 | " } extended;\n" |
3763 | " } v;\n" | |
3764 | "} align(%u);\n" | |
3765 | "\n" | |
3766 | "struct event_header_large {\n" | |
3767 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3768 | " variant <id> {\n" | |
3769 | " struct {\n" | |
a3ccff4f | 3770 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3771 | " } compact;\n" |
3772 | " struct {\n" | |
3773 | " uint32_t id;\n" | |
a3ccff4f | 3774 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3775 | " } extended;\n" |
3776 | " } v;\n" | |
3777 | "} align(%u);\n\n", | |
a90917c3 MD |
3778 | lttng_alignof(uint32_t) * CHAR_BIT, |
3779 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3780 | ); |
3781 | } | |
3782 | ||
a3ccff4f MD |
3783 | /* |
3784 | * Approximation of NTP time of day to clock monotonic correlation, | |
3785 | * taken at start of trace. | |
3786 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3787 | * in future versions. | |
5283350b MD |
3788 | * This function may return a negative offset. It may happen if the |
3789 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3790 | * |
3791 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3792 | * y2038 compliant. | |
a3ccff4f MD |
3793 | */ |
3794 | static | |
8967b2a3 | 3795 | int64_t measure_clock_offset(void) |
a3ccff4f | 3796 | { |
dcb93448 | 3797 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3798 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3799 | int64_t offset; |
a3ccff4f | 3800 | unsigned long flags; |
3636085f MJ |
3801 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3802 | struct timespec64 rts = { 0, 0 }; | |
3803 | #else | |
3804 | struct timespec rts = { 0, 0 }; | |
3805 | #endif | |
a3ccff4f MD |
3806 | |
3807 | /* Disable interrupts to increase correlation precision. */ | |
3808 | local_irq_save(flags); | |
3809 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3810 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3811 | ktime_get_real_ts64(&rts); | |
3812 | #else | |
216b6baa | 3813 | getnstimeofday(&rts); |
3636085f | 3814 | #endif |
a3ccff4f MD |
3815 | monotonic[1] = trace_clock_read64(); |
3816 | local_irq_restore(flags); | |
3817 | ||
dcb93448 | 3818 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3819 | realtime = (uint64_t) rts.tv_sec * tcf; |
3820 | if (tcf == NSEC_PER_SEC) { | |
3821 | realtime += rts.tv_nsec; | |
3822 | } else { | |
3823 | uint64_t n = rts.tv_nsec * tcf; | |
3824 | ||
3825 | do_div(n, NSEC_PER_SEC); | |
3826 | realtime += n; | |
3827 | } | |
dcb93448 | 3828 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3829 | return offset; |
3830 | } | |
3831 | ||
3eb95be4 JR |
3832 | static |
3833 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3834 | { | |
0f3eaad4 | 3835 | int ret = 0; |
3eb95be4 JR |
3836 | size_t i; |
3837 | char cur; | |
3838 | ||
3839 | i = 0; | |
3840 | cur = string[i]; | |
3841 | while (cur != '\0') { | |
3842 | switch (cur) { | |
3843 | case '\n': | |
3844 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3845 | break; | |
3846 | case '\\': | |
3847 | case '"': | |
3848 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3849 | if (ret) | |
3850 | goto error; | |
3851 | /* We still print the current char */ | |
3852 | /* Fallthrough */ | |
3853 | default: | |
3854 | ret = lttng_metadata_printf(session, "%c", cur); | |
3855 | break; | |
3856 | } | |
3857 | ||
3858 | if (ret) | |
3859 | goto error; | |
3860 | ||
3861 | cur = string[++i]; | |
3862 | } | |
3863 | error: | |
3864 | return ret; | |
3865 | } | |
3866 | ||
3867 | static | |
1c88f269 JR |
3868 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3869 | const char *field_value) | |
3eb95be4 JR |
3870 | { |
3871 | int ret; | |
3872 | ||
1c88f269 | 3873 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3874 | if (ret) |
3875 | goto error; | |
3876 | ||
1c88f269 | 3877 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3878 | if (ret) |
3879 | goto error; | |
3880 | ||
3881 | ret = lttng_metadata_printf(session, "\";\n"); | |
3882 | ||
3883 | error: | |
3884 | return ret; | |
3885 | } | |
3886 | ||
c099397a MD |
3887 | /* |
3888 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3889 | * Must be called with sessions_mutex held. |
c099397a MD |
3890 | */ |
3891 | static | |
a90917c3 | 3892 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3893 | { |
30bdb6e4 | 3894 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3895 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3896 | const char *product_uuid; |
a90917c3 | 3897 | struct lttng_channel *chan; |
a67ba386 | 3898 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3899 | int ret = 0; |
3900 | ||
585e5dcc | 3901 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3902 | return 0; |
8b97fd42 MD |
3903 | |
3904 | lttng_metadata_begin(session); | |
3905 | ||
c099397a MD |
3906 | if (session->metadata_dumped) |
3907 | goto skip_session; | |
c099397a | 3908 | |
d793d5e1 | 3909 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3910 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3911 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3912 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3913 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3914 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3915 | |
3916 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3917 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3918 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3919 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3920 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3921 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3922 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3923 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3924 | "\n" |
3925 | "trace {\n" | |
3926 | " major = %u;\n" | |
3927 | " minor = %u;\n" | |
30bdb6e4 | 3928 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3929 | " byte_order = %s;\n" |
3930 | " packet.header := struct {\n" | |
3931 | " uint32_t magic;\n" | |
1ec3f75a | 3932 | " uint8_t uuid[16];\n" |
d793d5e1 | 3933 | " uint32_t stream_id;\n" |
5594698f | 3934 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3935 | " };\n" |
d793d5e1 | 3936 | "};\n\n", |
a90917c3 MD |
3937 | lttng_alignof(uint8_t) * CHAR_BIT, |
3938 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3939 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3940 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3941 | sizeof(unsigned long) * CHAR_BIT, |
3942 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3943 | CTF_SPEC_MAJOR, |
3944 | CTF_SPEC_MINOR, | |
d793d5e1 | 3945 | uuid_s, |
5214fa50 | 3946 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3947 | "be" |
3948 | #else | |
3949 | "le" | |
3950 | #endif | |
3951 | ); | |
3952 | if (ret) | |
3953 | goto end; | |
3954 | ||
99dc9597 MD |
3955 | ret = lttng_metadata_printf(session, |
3956 | "env {\n" | |
a6058143 | 3957 | " hostname = \"%s\";\n" |
c6c9e10f | 3958 | " domain = \"kernel\";\n" |
99dc9597 | 3959 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3960 | " kernel_release = \"%s\";\n" |
3961 | " kernel_version = \"%s\";\n" | |
3962 | " tracer_name = \"lttng-modules\";\n" | |
3963 | " tracer_major = %d;\n" | |
3964 | " tracer_minor = %d;\n" | |
3965 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3966 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3967 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3968 | utsname()->sysname, |
3969 | utsname()->release, | |
c6c9e10f MD |
3970 | utsname()->version, |
3971 | LTTNG_MODULES_MAJOR_VERSION, | |
3972 | LTTNG_MODULES_MINOR_VERSION, | |
3973 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3974 | ); |
3975 | if (ret) | |
3976 | goto end; | |
3977 | ||
1c88f269 JR |
3978 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3979 | if (ret) | |
3980 | goto end; | |
3981 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3982 | session->creation_time); | |
3eb95be4 JR |
3983 | if (ret) |
3984 | goto end; | |
3985 | ||
c88f762e GB |
3986 | /* Add the product UUID to the 'env' section */ |
3987 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3988 | if (product_uuid) { | |
3989 | ret = lttng_metadata_printf(session, | |
3990 | " product_uuid = \"%s\";\n", | |
3991 | product_uuid | |
3992 | ); | |
3993 | if (ret) | |
3994 | goto end; | |
3995 | } | |
3996 | ||
3997 | /* Close the 'env' section */ | |
3eb95be4 JR |
3998 | ret = lttng_metadata_printf(session, "};\n\n"); |
3999 | if (ret) | |
4000 | goto end; | |
4001 | ||
a3ccff4f MD |
4002 | ret = lttng_metadata_printf(session, |
4003 | "clock {\n" | |
2754583e MD |
4004 | " name = \"%s\";\n", |
4005 | trace_clock_name() | |
a82c63f1 MD |
4006 | ); |
4007 | if (ret) | |
4008 | goto end; | |
4009 | ||
4010 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4011 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4012 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4013 | clock_uuid_s |
4014 | ); | |
4015 | if (ret) | |
4016 | goto end; | |
4017 | } | |
4018 | ||
4019 | ret = lttng_metadata_printf(session, | |
2754583e | 4020 | " description = \"%s\";\n" |
a3ccff4f MD |
4021 | " freq = %llu; /* Frequency, in Hz */\n" |
4022 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4023 | " offset = %lld;\n" |
a3ccff4f | 4024 | "};\n\n", |
2754583e | 4025 | trace_clock_description(), |
a3ccff4f | 4026 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4027 | (long long) measure_clock_offset() |
a3ccff4f MD |
4028 | ); |
4029 | if (ret) | |
4030 | goto end; | |
4031 | ||
4032 | ret = lttng_metadata_printf(session, | |
4033 | "typealias integer {\n" | |
4034 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4035 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4036 | "} := uint27_clock_monotonic_t;\n" |
4037 | "\n" | |
4038 | "typealias integer {\n" | |
4039 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4040 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4041 | "} := uint32_clock_monotonic_t;\n" |
4042 | "\n" | |
4043 | "typealias integer {\n" | |
4044 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4045 | " map = clock.%s.value;\n" |
a3ccff4f | 4046 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4047 | trace_clock_name(), |
a3ccff4f | 4048 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4049 | trace_clock_name(), |
4050 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4051 | trace_clock_name() | |
a3ccff4f MD |
4052 | ); |
4053 | if (ret) | |
4054 | goto end; | |
4055 | ||
a90917c3 | 4056 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4057 | if (ret) |
4058 | goto end; | |
4059 | ||
a90917c3 | 4060 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4061 | if (ret) |
4062 | goto end; | |
4063 | ||
c099397a MD |
4064 | skip_session: |
4065 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4066 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4067 | if (ret) |
4068 | goto end; | |
4069 | } | |
4070 | ||
a67ba386 MD |
4071 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
4072 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, | |
4073 | event_recorder_priv->pub); | |
c099397a MD |
4074 | if (ret) |
4075 | goto end; | |
4076 | } | |
4077 | session->metadata_dumped = 1; | |
4078 | end: | |
8b97fd42 | 4079 | lttng_metadata_end(session); |
c099397a MD |
4080 | return ret; |
4081 | } | |
4082 | ||
c0e31d2e | 4083 | /** |
a90917c3 | 4084 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4085 | * @transport: transport structure |
4086 | * | |
4087 | * Registers a transport which can be used as output to extract the data out of | |
4088 | * LTTng. The module calling this registration function must ensure that no | |
4089 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4090 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4091 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4092 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4093 | * after its registration must it synchronize the TLBs. |
4094 | */ | |
a90917c3 | 4095 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4096 | { |
4097 | /* | |
4098 | * Make sure no page fault can be triggered by the module about to be | |
4099 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4100 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4101 | */ |
263b6c88 | 4102 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4103 | |
4104 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4105 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4106 | mutex_unlock(&sessions_mutex); |
4107 | } | |
a90917c3 | 4108 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4109 | |
4110 | /** | |
a90917c3 | 4111 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4112 | * @transport: transport structure |
4113 | */ | |
a90917c3 | 4114 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4115 | { |
4116 | mutex_lock(&sessions_mutex); | |
4117 | list_del(&transport->node); | |
4118 | mutex_unlock(&sessions_mutex); | |
4119 | } | |
a90917c3 | 4120 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4121 | |
a101fa10 MD |
4122 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4123 | { | |
4124 | /* | |
4125 | * Make sure no page fault can be triggered by the module about to be | |
4126 | * registered. We deal with this here so we don't have to call | |
4127 | * vmalloc_sync_mappings() in each module's init. | |
4128 | */ | |
4129 | wrapper_vmalloc_sync_mappings(); | |
4130 | ||
4131 | mutex_lock(&sessions_mutex); | |
4132 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4133 | mutex_unlock(&sessions_mutex); | |
4134 | } | |
4135 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4136 | ||
4137 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4138 | { | |
4139 | mutex_lock(&sessions_mutex); | |
4140 | list_del(&transport->node); | |
4141 | mutex_unlock(&sessions_mutex); | |
4142 | } | |
4143 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4144 | ||
5f4c791e | 4145 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4146 | |
4147 | enum cpuhp_state lttng_hp_prepare; | |
4148 | enum cpuhp_state lttng_hp_online; | |
4149 | ||
4150 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4151 | { | |
4152 | struct lttng_cpuhp_node *lttng_node; | |
4153 | ||
4154 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4155 | switch (lttng_node->component) { | |
4156 | case LTTNG_RING_BUFFER_FRONTEND: | |
4157 | return 0; | |
4158 | case LTTNG_RING_BUFFER_BACKEND: | |
4159 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4160 | case LTTNG_RING_BUFFER_ITER: | |
4161 | return 0; | |
4162 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4163 | return 0; | |
4164 | default: | |
4165 | return -EINVAL; | |
4166 | } | |
4167 | } | |
4168 | ||
4169 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4170 | { | |
4171 | struct lttng_cpuhp_node *lttng_node; | |
4172 | ||
4173 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4174 | switch (lttng_node->component) { | |
4175 | case LTTNG_RING_BUFFER_FRONTEND: | |
4176 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4177 | case LTTNG_RING_BUFFER_BACKEND: | |
4178 | return 0; | |
4179 | case LTTNG_RING_BUFFER_ITER: | |
4180 | return 0; | |
4181 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4182 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4183 | default: | |
4184 | return -EINVAL; | |
4185 | } | |
4186 | } | |
4187 | ||
4188 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4189 | { | |
4190 | struct lttng_cpuhp_node *lttng_node; | |
4191 | ||
4192 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4193 | switch (lttng_node->component) { | |
4194 | case LTTNG_RING_BUFFER_FRONTEND: | |
4195 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4196 | case LTTNG_RING_BUFFER_BACKEND: | |
4197 | return 0; | |
4198 | case LTTNG_RING_BUFFER_ITER: | |
4199 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4200 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4201 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4202 | default: | |
4203 | return -EINVAL; | |
4204 | } | |
4205 | } | |
4206 | ||
4207 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4208 | { | |
4209 | struct lttng_cpuhp_node *lttng_node; | |
4210 | ||
4211 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4212 | switch (lttng_node->component) { | |
4213 | case LTTNG_RING_BUFFER_FRONTEND: | |
4214 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4215 | case LTTNG_RING_BUFFER_BACKEND: | |
4216 | return 0; | |
4217 | case LTTNG_RING_BUFFER_ITER: | |
4218 | return 0; | |
4219 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4220 | return 0; | |
4221 | default: | |
4222 | return -EINVAL; | |
4223 | } | |
4224 | } | |
4225 | ||
4226 | static int __init lttng_init_cpu_hotplug(void) | |
4227 | { | |
4228 | int ret; | |
4229 | ||
4230 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4231 | lttng_hotplug_prepare, | |
4232 | lttng_hotplug_dead); | |
4233 | if (ret < 0) { | |
4234 | return ret; | |
4235 | } | |
4236 | lttng_hp_prepare = ret; | |
4237 | lttng_rb_set_hp_prepare(ret); | |
4238 | ||
4239 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4240 | lttng_hotplug_online, | |
4241 | lttng_hotplug_offline); | |
4242 | if (ret < 0) { | |
4243 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4244 | lttng_hp_prepare = 0; | |
4245 | return ret; | |
4246 | } | |
4247 | lttng_hp_online = ret; | |
4248 | lttng_rb_set_hp_online(ret); | |
4249 | ||
4250 | return 0; | |
4251 | } | |
4252 | ||
4253 | static void __exit lttng_exit_cpu_hotplug(void) | |
4254 | { | |
4255 | lttng_rb_set_hp_online(0); | |
4256 | cpuhp_remove_multi_state(lttng_hp_online); | |
4257 | lttng_rb_set_hp_prepare(0); | |
4258 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4259 | } | |
4260 | ||
5f4c791e | 4261 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4262 | static int lttng_init_cpu_hotplug(void) |
4263 | { | |
4264 | return 0; | |
4265 | } | |
4266 | static void lttng_exit_cpu_hotplug(void) | |
4267 | { | |
4268 | } | |
5f4c791e | 4269 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4270 | |
4271 | ||
a90917c3 | 4272 | static int __init lttng_events_init(void) |
4e3c1b9b | 4273 | { |
1c25284c MD |
4274 | int ret; |
4275 | ||
453b2495 JD |
4276 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4277 | if (ret) | |
4278 | return ret; | |
389d7070 | 4279 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4280 | if (ret) |
4281 | return ret; | |
4282 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4283 | if (ret) |
4284 | return ret; | |
4285 | ret = lttng_probes_init(); | |
389d7070 MD |
4286 | if (ret) |
4287 | return ret; | |
07dfc1d0 | 4288 | ret = lttng_context_init(); |
20591cf7 MD |
4289 | if (ret) |
4290 | return ret; | |
07dfc1d0 MD |
4291 | ret = lttng_tracepoint_init(); |
4292 | if (ret) | |
4293 | goto error_tp; | |
a67ba386 MD |
4294 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4295 | if (!event_recorder_cache) { | |
20591cf7 | 4296 | ret = -ENOMEM; |
a67ba386 | 4297 | goto error_kmem_event_recorder; |
dffef45d | 4298 | } |
a67ba386 MD |
4299 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4300 | if (!event_recorder_private_cache) { | |
4301 | ret = -ENOMEM; | |
4302 | goto error_kmem_event_recorder_private; | |
4303 | } | |
4304 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4305 | if (!event_notifier_cache) { |
4306 | ret = -ENOMEM; | |
4307 | goto error_kmem_event_notifier; | |
20591cf7 | 4308 | } |
a67ba386 MD |
4309 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4310 | if (!event_notifier_private_cache) { | |
4311 | ret = -ENOMEM; | |
4312 | goto error_kmem_event_notifier_private; | |
4313 | } | |
80996790 | 4314 | ret = lttng_abi_init(); |
02119ee5 MD |
4315 | if (ret) |
4316 | goto error_abi; | |
0c956676 MD |
4317 | ret = lttng_logger_init(); |
4318 | if (ret) | |
4319 | goto error_logger; | |
1e367326 MD |
4320 | ret = lttng_init_cpu_hotplug(); |
4321 | if (ret) | |
4322 | goto error_hotplug; | |
101215b7 | 4323 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4324 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4325 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4326 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4327 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4328 | LTTNG_VERSION_NAME, |
4329 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4330 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4331 | #else | |
4332 | "", | |
4333 | #endif | |
4334 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4335 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4336 | #else | |
4337 | ""); | |
4338 | #endif | |
4e3c1b9b | 4339 | return 0; |
0c956676 | 4340 | |
1e367326 MD |
4341 | error_hotplug: |
4342 | lttng_logger_exit(); | |
0c956676 MD |
4343 | error_logger: |
4344 | lttng_abi_exit(); | |
02119ee5 | 4345 | error_abi: |
a67ba386 MD |
4346 | kmem_cache_destroy(event_notifier_private_cache); |
4347 | error_kmem_event_notifier_private: | |
dffef45d FD |
4348 | kmem_cache_destroy(event_notifier_cache); |
4349 | error_kmem_event_notifier: | |
a67ba386 MD |
4350 | kmem_cache_destroy(event_recorder_private_cache); |
4351 | error_kmem_event_recorder_private: | |
4352 | kmem_cache_destroy(event_recorder_cache); | |
4353 | error_kmem_event_recorder: | |
20591cf7 | 4354 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4355 | error_tp: |
4356 | lttng_context_exit(); | |
101215b7 | 4357 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4358 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4359 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4360 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4361 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4362 | LTTNG_VERSION_NAME, |
4363 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4364 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4365 | #else | |
4366 | "", | |
4367 | #endif | |
4368 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4369 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4370 | #else | |
4371 | ""); | |
4372 | #endif | |
1c25284c | 4373 | return ret; |
4e3c1b9b MD |
4374 | } |
4375 | ||
a90917c3 | 4376 | module_init(lttng_events_init); |
11b5a3c2 | 4377 | |
a90917c3 | 4378 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4379 | { |
a90917c3 | 4380 | struct lttng_session *session, *tmpsession; |
92e94819 | 4381 | |
1e367326 | 4382 | lttng_exit_cpu_hotplug(); |
0c956676 | 4383 | lttng_logger_exit(); |
80996790 | 4384 | lttng_abi_exit(); |
92e94819 | 4385 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4386 | lttng_session_destroy(session); |
a67ba386 MD |
4387 | kmem_cache_destroy(event_recorder_cache); |
4388 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4389 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4390 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4391 | lttng_tracepoint_exit(); |
07dfc1d0 | 4392 | lttng_context_exit(); |
101215b7 | 4393 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4394 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4395 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4396 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4397 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4398 | LTTNG_VERSION_NAME, |
4399 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4400 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4401 | #else | |
4402 | "", | |
4403 | #endif | |
4404 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4405 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4406 | #else | |
4407 | ""); | |
4408 | #endif | |
4e3c1b9b | 4409 | } |
92e94819 | 4410 | |
a90917c3 | 4411 | module_exit(lttng_events_exit); |
11b5a3c2 | 4412 | |
7ca11e77 | 4413 | #include <generated/patches.h> |
101215b7 MJ |
4414 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4415 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4416 | #endif | |
4417 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4418 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4419 | #endif | |
92e94819 MD |
4420 | MODULE_LICENSE("GPL and additional rights"); |
4421 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4422 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4423 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4424 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4425 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4426 | LTTNG_MODULES_EXTRAVERSION); |