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, |
51ef4536 | 92 | size_t nesting, const char **prev_field_name_p); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
5f4c791e | 96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
97 | synchronize_rcu(); |
98 | #else | |
abcca994 | 99 | synchronize_sched(); |
92da05ce MJ |
100 | #endif |
101 | ||
5f4c791e | 102 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
103 | #ifdef CONFIG_PREEMPT_RT_FULL |
104 | synchronize_rcu(); | |
105 | #endif | |
5f4c791e | 106 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | #ifdef CONFIG_PREEMPT_RT |
108 | synchronize_rcu(); | |
109 | #endif | |
5f4c791e | 110 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
111 | } |
112 | ||
3c997079 MD |
113 | void lttng_lock_sessions(void) |
114 | { | |
115 | mutex_lock(&sessions_mutex); | |
116 | } | |
117 | ||
118 | void lttng_unlock_sessions(void) | |
119 | { | |
120 | mutex_unlock(&sessions_mutex); | |
121 | } | |
122 | ||
9fe593d2 FD |
123 | static struct lttng_transport *lttng_transport_find(const char *name) |
124 | { | |
125 | struct lttng_transport *transport; | |
126 | ||
127 | list_for_each_entry(transport, <tng_transport_list, node) { | |
128 | if (!strcmp(transport->name, name)) | |
129 | return transport; | |
130 | } | |
131 | return NULL; | |
132 | } | |
133 | ||
3c997079 MD |
134 | /* |
135 | * Called with sessions lock held. | |
136 | */ | |
137 | int lttng_session_active(void) | |
138 | { | |
139 | struct lttng_session *iter; | |
140 | ||
141 | list_for_each_entry(iter, &sessions, list) { | |
142 | if (iter->active) | |
143 | return 1; | |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
a90917c3 | 148 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 149 | { |
a90917c3 | 150 | struct lttng_session *session; |
d83004aa | 151 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 152 | int i; |
4e3c1b9b MD |
153 | |
154 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 155 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 156 | if (!session) |
d83004aa | 157 | goto err; |
4e3c1b9b | 158 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 159 | INIT_LIST_HEAD(&session->events); |
a7008254 | 160 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
161 | |
162 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
163 | GFP_KERNEL); | |
164 | if (!metadata_cache) | |
165 | goto err_free_session; | |
0ca42eb7 | 166 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
167 | if (!metadata_cache->data) |
168 | goto err_free_cache; | |
169 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
170 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 171 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
172 | session->metadata_cache = metadata_cache; |
173 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
174 | memcpy(&metadata_cache->uuid, &session->uuid, |
175 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
176 | INIT_LIST_HEAD(&session->enablers_head); |
177 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
178 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 179 | list_add(&session->list, &sessions); |
d1f652f8 MD |
180 | session->pid_tracker.session = session; |
181 | session->pid_tracker.tracker_type = TRACKER_PID; | |
182 | session->vpid_tracker.session = session; | |
183 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
184 | session->uid_tracker.session = session; | |
185 | session->uid_tracker.tracker_type = TRACKER_UID; | |
186 | session->vuid_tracker.session = session; | |
187 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
188 | session->gid_tracker.session = session; | |
189 | session->gid_tracker.tracker_type = TRACKER_GID; | |
190 | session->vgid_tracker.session = session; | |
191 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
192 | mutex_unlock(&sessions_mutex); |
193 | return session; | |
d83004aa JD |
194 | |
195 | err_free_cache: | |
196 | kfree(metadata_cache); | |
197 | err_free_session: | |
48f5e0b5 | 198 | lttng_kvfree(session); |
d83004aa JD |
199 | err: |
200 | mutex_unlock(&sessions_mutex); | |
201 | return NULL; | |
202 | } | |
203 | ||
99f52fcc FD |
204 | static |
205 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
206 | { | |
207 | struct lttng_counter_transport *transport; | |
208 | ||
209 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
210 | if (!strcmp(transport->name, name)) | |
211 | return transport; | |
212 | } | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | struct lttng_counter *lttng_kernel_counter_create( | |
217 | const char *counter_transport_name, | |
218 | size_t number_dimensions, const size_t *dimensions_sizes) | |
219 | { | |
220 | struct lttng_counter *counter = NULL; | |
221 | struct lttng_counter_transport *counter_transport = NULL; | |
222 | ||
223 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
224 | if (!counter_transport) { | |
225 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
226 | counter_transport_name); | |
227 | goto notransport; | |
228 | } | |
229 | if (!try_module_get(counter_transport->owner)) { | |
230 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
231 | goto notransport; | |
232 | } | |
233 | ||
234 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
235 | if (!counter) | |
236 | goto nomem; | |
237 | ||
238 | /* Create event notifier error counter. */ | |
239 | counter->ops = &counter_transport->ops; | |
240 | counter->transport = counter_transport; | |
241 | ||
242 | counter->counter = counter->ops->counter_create( | |
243 | number_dimensions, dimensions_sizes, 0); | |
244 | if (!counter->counter) { | |
245 | goto create_error; | |
246 | } | |
247 | ||
248 | return counter; | |
249 | ||
250 | create_error: | |
251 | lttng_kvfree(counter); | |
252 | nomem: | |
253 | if (counter_transport) | |
254 | module_put(counter_transport->owner); | |
255 | notransport: | |
256 | return NULL; | |
257 | } | |
258 | ||
750b05f2 FD |
259 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
260 | { | |
261 | struct lttng_transport *transport = NULL; | |
262 | struct lttng_event_notifier_group *event_notifier_group; | |
263 | const char *transport_name = "relay-event-notifier"; | |
264 | size_t subbuf_size = 4096; //TODO | |
265 | size_t num_subbuf = 16; //TODO | |
266 | unsigned int switch_timer_interval = 0; | |
267 | unsigned int read_timer_interval = 0; | |
dffef45d | 268 | int i; |
750b05f2 FD |
269 | |
270 | mutex_lock(&sessions_mutex); | |
271 | ||
272 | transport = lttng_transport_find(transport_name); | |
273 | if (!transport) { | |
274 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
275 | transport_name); | |
276 | goto notransport; | |
277 | } | |
278 | if (!try_module_get(transport->owner)) { | |
279 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
280 | transport_name); | |
281 | goto notransport; | |
282 | } | |
283 | ||
284 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
285 | GFP_KERNEL); | |
286 | if (!event_notifier_group) | |
287 | goto nomem; | |
288 | ||
289 | /* | |
290 | * Initialize the ring buffer used to store event notifier | |
291 | * notifications. | |
292 | */ | |
293 | event_notifier_group->ops = &transport->ops; | |
294 | event_notifier_group->chan = transport->ops.channel_create( | |
295 | transport_name, event_notifier_group, NULL, | |
296 | subbuf_size, num_subbuf, switch_timer_interval, | |
297 | read_timer_interval); | |
298 | if (!event_notifier_group->chan) | |
299 | goto create_error; | |
300 | ||
301 | event_notifier_group->transport = transport; | |
dffef45d FD |
302 | |
303 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
304 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
305 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
306 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
307 | ||
750b05f2 FD |
308 | list_add(&event_notifier_group->node, &event_notifier_groups); |
309 | ||
310 | mutex_unlock(&sessions_mutex); | |
311 | ||
312 | return event_notifier_group; | |
313 | ||
314 | create_error: | |
315 | lttng_kvfree(event_notifier_group); | |
316 | nomem: | |
317 | if (transport) | |
318 | module_put(transport->owner); | |
319 | notransport: | |
320 | mutex_unlock(&sessions_mutex); | |
321 | return NULL; | |
322 | } | |
323 | ||
d83004aa JD |
324 | void metadata_cache_destroy(struct kref *kref) |
325 | { | |
326 | struct lttng_metadata_cache *cache = | |
327 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 328 | vfree(cache->data); |
d83004aa | 329 | kfree(cache); |
4e3c1b9b MD |
330 | } |
331 | ||
a90917c3 | 332 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 333 | { |
a90917c3 | 334 | struct lttng_channel *chan, *tmpchan; |
a67ba386 | 335 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 336 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 337 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 338 | int ret; |
4e3c1b9b MD |
339 | |
340 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 341 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 342 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 343 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
344 | WARN_ON(ret); |
345 | } | |
a67ba386 MD |
346 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
347 | ret = _lttng_event_unregister(event_recorder_priv->pub); | |
dda6a249 MD |
348 | WARN_ON(ret); |
349 | } | |
abcca994 | 350 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 351 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 352 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
353 | WARN_ON(ret); |
354 | } | |
b2bc0bc8 | 355 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 356 | &session->enablers_head, node) |
b2bc0bc8 | 357 | lttng_event_enabler_destroy(event_enabler); |
a67ba386 | 358 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->events, node) |
0648898e | 359 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
d83004aa JD |
360 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
361 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 362 | _lttng_channel_destroy(chan); |
d83004aa | 363 | } |
ab036a63 | 364 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
365 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
366 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 367 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
368 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
369 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
371 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
372 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
373 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 374 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
375 | list_del(&session->list); |
376 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 377 | lttng_kvfree(session); |
4e3c1b9b MD |
378 | } |
379 | ||
dffef45d FD |
380 | void lttng_event_notifier_group_destroy( |
381 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 382 | { |
dffef45d | 383 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 384 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
385 | int ret; |
386 | ||
750b05f2 FD |
387 | if (!event_notifier_group) |
388 | return; | |
389 | ||
390 | mutex_lock(&sessions_mutex); | |
dffef45d | 391 | |
3b82c4e1 | 392 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
393 | WARN_ON(ret); |
394 | ||
a67ba386 MD |
395 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
396 | &event_notifier_group->event_notifiers_head, node) { | |
397 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
398 | WARN_ON(ret); |
399 | } | |
400 | ||
b01155ba FD |
401 | /* Wait for in-flight event notifier to complete */ |
402 | synchronize_trace(); | |
403 | ||
21f58fb7 FD |
404 | irq_work_sync(&event_notifier_group->wakeup_pending); |
405 | ||
8a8ac9a8 FD |
406 | kfree(event_notifier_group->sc_filter); |
407 | ||
dffef45d FD |
408 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
409 | &event_notifier_group->enablers_head, node) | |
410 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
411 | ||
a67ba386 MD |
412 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
413 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 414 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 415 | |
99f52fcc FD |
416 | if (event_notifier_group->error_counter) { |
417 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 418 | |
99f52fcc FD |
419 | error_counter->ops->counter_destroy(error_counter->counter); |
420 | module_put(error_counter->transport->owner); | |
421 | lttng_kvfree(error_counter); | |
422 | event_notifier_group->error_counter = NULL; | |
423 | } | |
424 | ||
750b05f2 FD |
425 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
426 | module_put(event_notifier_group->transport->owner); | |
427 | list_del(&event_notifier_group->node); | |
dffef45d | 428 | |
750b05f2 FD |
429 | mutex_unlock(&sessions_mutex); |
430 | lttng_kvfree(event_notifier_group); | |
431 | } | |
432 | ||
601252cf MD |
433 | int lttng_session_statedump(struct lttng_session *session) |
434 | { | |
435 | int ret; | |
436 | ||
437 | mutex_lock(&sessions_mutex); | |
438 | ret = lttng_statedump_start(session); | |
439 | mutex_unlock(&sessions_mutex); | |
440 | return ret; | |
441 | } | |
442 | ||
a90917c3 | 443 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
444 | { |
445 | int ret = 0; | |
a90917c3 | 446 | struct lttng_channel *chan; |
c0e31d2e MD |
447 | |
448 | mutex_lock(&sessions_mutex); | |
449 | if (session->active) { | |
450 | ret = -EBUSY; | |
451 | goto end; | |
452 | } | |
c099397a | 453 | |
3c997079 MD |
454 | /* Set transient enabler state to "enabled" */ |
455 | session->tstate = 1; | |
456 | ||
4ef81e4a | 457 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 458 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 459 | |
c099397a MD |
460 | /* |
461 | * Snapshot the number of events per channel to know the type of header | |
462 | * we need to use. | |
463 | */ | |
464 | list_for_each_entry(chan, &session->chan, list) { | |
465 | if (chan->header_type) | |
466 | continue; /* don't change it if session stop/restart */ | |
467 | if (chan->free_event_id < 31) | |
468 | chan->header_type = 1; /* compact */ | |
469 | else | |
470 | chan->header_type = 2; /* large */ | |
471 | } | |
472 | ||
64af2437 | 473 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
474 | list_for_each_entry(chan, &session->chan, list) { |
475 | if (chan->channel_type != METADATA_CHANNEL) | |
476 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
477 | } | |
64af2437 | 478 | |
a8f2d0c7 MJ |
479 | WRITE_ONCE(session->active, 1); |
480 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 481 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 482 | if (ret) { |
a8f2d0c7 | 483 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
484 | goto end; |
485 | } | |
486 | ret = lttng_statedump_start(session); | |
360f38ea | 487 | if (ret) |
a8f2d0c7 | 488 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
489 | end: |
490 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 491 | return ret; |
c0e31d2e MD |
492 | } |
493 | ||
a90917c3 | 494 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
495 | { |
496 | int ret = 0; | |
64af2437 | 497 | struct lttng_channel *chan; |
c0e31d2e MD |
498 | |
499 | mutex_lock(&sessions_mutex); | |
500 | if (!session->active) { | |
501 | ret = -EBUSY; | |
502 | goto end; | |
503 | } | |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
505 | |
506 | /* Set transient enabler state to "disabled" */ | |
507 | session->tstate = 0; | |
b2bc0bc8 | 508 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
509 | |
510 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
511 | list_for_each_entry(chan, &session->chan, list) { |
512 | if (chan->channel_type != METADATA_CHANNEL) | |
513 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
514 | } | |
c0e31d2e MD |
515 | end: |
516 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 517 | return ret; |
c0e31d2e MD |
518 | } |
519 | ||
9616f0bf JD |
520 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
521 | { | |
522 | int ret = 0; | |
523 | struct lttng_channel *chan; | |
a67ba386 | 524 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
9616f0bf JD |
525 | struct lttng_metadata_cache *cache = session->metadata_cache; |
526 | struct lttng_metadata_stream *stream; | |
527 | ||
528 | mutex_lock(&sessions_mutex); | |
529 | if (!session->active) { | |
530 | ret = -EBUSY; | |
531 | goto end; | |
532 | } | |
533 | ||
534 | mutex_lock(&cache->lock); | |
535 | memset(cache->data, 0, cache->cache_alloc); | |
536 | cache->metadata_written = 0; | |
537 | cache->version++; | |
538 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
539 | stream->metadata_out = 0; | |
540 | stream->metadata_in = 0; | |
541 | } | |
542 | mutex_unlock(&cache->lock); | |
543 | ||
544 | session->metadata_dumped = 0; | |
545 | list_for_each_entry(chan, &session->chan, list) { | |
546 | chan->metadata_dumped = 0; | |
547 | } | |
548 | ||
a67ba386 MD |
549 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
550 | event_recorder_priv->metadata_dumped = 0; | |
9616f0bf JD |
551 | } |
552 | ||
553 | ret = _lttng_session_metadata_statedump(session); | |
554 | ||
555 | end: | |
556 | mutex_unlock(&sessions_mutex); | |
557 | return ret; | |
558 | } | |
559 | ||
a90917c3 | 560 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 561 | { |
3c997079 | 562 | int ret = 0; |
e64957da | 563 | |
3c997079 MD |
564 | mutex_lock(&sessions_mutex); |
565 | if (channel->channel_type == METADATA_CHANNEL) { | |
566 | ret = -EPERM; | |
567 | goto end; | |
568 | } | |
569 | if (channel->enabled) { | |
570 | ret = -EEXIST; | |
571 | goto end; | |
572 | } | |
573 | /* Set transient enabler state to "enabled" */ | |
574 | channel->tstate = 1; | |
b2bc0bc8 | 575 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 576 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 577 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
578 | end: |
579 | mutex_unlock(&sessions_mutex); | |
580 | return ret; | |
e64957da MD |
581 | } |
582 | ||
a90917c3 | 583 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 584 | { |
3c997079 | 585 | int ret = 0; |
e64957da | 586 | |
3c997079 MD |
587 | mutex_lock(&sessions_mutex); |
588 | if (channel->channel_type == METADATA_CHANNEL) { | |
589 | ret = -EPERM; | |
590 | goto end; | |
591 | } | |
592 | if (!channel->enabled) { | |
593 | ret = -EEXIST; | |
594 | goto end; | |
595 | } | |
596 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 597 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
598 | /* Set transient enabler state to "enabled" */ |
599 | channel->tstate = 0; | |
b2bc0bc8 | 600 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
601 | end: |
602 | mutex_unlock(&sessions_mutex); | |
603 | return ret; | |
e64957da MD |
604 | } |
605 | ||
9d993668 | 606 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 607 | { |
3c997079 | 608 | int ret = 0; |
e64957da | 609 | |
3c997079 | 610 | mutex_lock(&sessions_mutex); |
9d993668 MD |
611 | switch (event->type) { |
612 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
613 | { | |
614 | struct lttng_kernel_event_recorder *event_recorder = | |
615 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
616 | ||
617 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
618 | ret = -EPERM; | |
619 | goto end; | |
620 | } | |
a0493bef | 621 | break; |
9d993668 MD |
622 | } |
623 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
624 | switch (event->priv->instrumentation) { | |
625 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
626 | ret = -EINVAL; | |
627 | goto end; | |
628 | default: | |
629 | break; | |
630 | } | |
a0493bef MD |
631 | break; |
632 | default: | |
9d993668 | 633 | break; |
a0493bef | 634 | } |
e64957da | 635 | |
9d993668 | 636 | if (event->enabled) { |
3c997079 MD |
637 | ret = -EEXIST; |
638 | goto end; | |
639 | } | |
a67ba386 | 640 | switch (event->priv->instrumentation) { |
606828e4 MD |
641 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
642 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
643 | ret = -EINVAL; |
644 | break; | |
b4a75708 | 645 | |
606828e4 MD |
646 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
647 | case LTTNG_KERNEL_ABI_UPROBE: | |
9d993668 | 648 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 649 | break; |
b4a75708 | 650 | |
606828e4 | 651 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 652 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 653 | break; |
b4a75708 | 654 | |
606828e4 MD |
655 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
656 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
657 | default: |
658 | WARN_ON_ONCE(1); | |
659 | ret = -EINVAL; | |
660 | } | |
3c997079 MD |
661 | end: |
662 | mutex_unlock(&sessions_mutex); | |
663 | return ret; | |
e64957da MD |
664 | } |
665 | ||
9d993668 | 666 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
667 | { |
668 | int ret = 0; | |
669 | ||
670 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
671 | switch (event->type) { |
672 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
673 | { | |
674 | struct lttng_kernel_event_recorder *event_recorder = | |
675 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
676 | ||
677 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
678 | ret = -EPERM; | |
679 | goto end; | |
680 | } | |
b01155ba | 681 | break; |
9d993668 MD |
682 | } |
683 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
684 | switch (event->priv->instrumentation) { | |
685 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
686 | ret = -EINVAL; | |
687 | goto end; | |
688 | default: | |
689 | break; | |
690 | } | |
2b16f0c9 | 691 | break; |
dffef45d | 692 | default: |
9d993668 | 693 | break; |
dffef45d | 694 | } |
dffef45d | 695 | |
a67ba386 | 696 | if (!event->enabled) { |
dffef45d FD |
697 | ret = -EEXIST; |
698 | goto end; | |
699 | } | |
a67ba386 | 700 | switch (event->priv->instrumentation) { |
606828e4 MD |
701 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
702 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
703 | ret = -EINVAL; |
704 | break; | |
b4a75708 | 705 | |
606828e4 MD |
706 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
707 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 708 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 709 | break; |
b4a75708 | 710 | |
9d993668 MD |
711 | case LTTNG_KERNEL_ABI_KRETPROBE: |
712 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
713 | break; | |
714 | ||
606828e4 | 715 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 716 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
dffef45d FD |
717 | default: |
718 | WARN_ON_ONCE(1); | |
719 | ret = -EINVAL; | |
720 | } | |
721 | end: | |
722 | mutex_unlock(&sessions_mutex); | |
723 | return ret; | |
724 | } | |
725 | ||
a90917c3 | 726 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
727 | const char *transport_name, |
728 | void *buf_addr, | |
4e3c1b9b MD |
729 | size_t subbuf_size, size_t num_subbuf, |
730 | unsigned int switch_timer_interval, | |
d83004aa JD |
731 | unsigned int read_timer_interval, |
732 | enum channel_type channel_type) | |
4e3c1b9b | 733 | { |
a90917c3 MD |
734 | struct lttng_channel *chan; |
735 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
736 | |
737 | mutex_lock(&sessions_mutex); | |
d83004aa | 738 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 739 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 740 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 741 | if (!transport) { |
5a15f70c | 742 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 743 | transport_name); |
c0e31d2e | 744 | goto notransport; |
f3d01b96 | 745 | } |
a33c9927 | 746 | if (!try_module_get(transport->owner)) { |
5a15f70c | 747 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
748 | goto notransport; |
749 | } | |
a90917c3 | 750 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 751 | if (!chan) |
c0e31d2e | 752 | goto nomem; |
4e3c1b9b | 753 | chan->session = session; |
05d32c64 | 754 | chan->id = session->free_chan_id++; |
3b731ab1 | 755 | chan->ops = &transport->ops; |
125b4df4 MD |
756 | /* |
757 | * Note: the channel creation op already writes into the packet | |
758 | * headers. Therefore the "chan" information used as input | |
759 | * should be already accessible. | |
760 | */ | |
5f5ddf01 MD |
761 | chan->chan = transport->ops.channel_create(transport_name, |
762 | chan, buf_addr, subbuf_size, num_subbuf, | |
763 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
764 | if (!chan->chan) |
765 | goto create_error; | |
3c997079 | 766 | chan->tstate = 1; |
e64957da | 767 | chan->enabled = 1; |
a33c9927 | 768 | chan->transport = transport; |
d83004aa | 769 | chan->channel_type = channel_type; |
4e3c1b9b MD |
770 | list_add(&chan->list, &session->chan); |
771 | mutex_unlock(&sessions_mutex); | |
772 | return chan; | |
773 | ||
f3d01b96 MD |
774 | create_error: |
775 | kfree(chan); | |
c0e31d2e | 776 | nomem: |
a33c9927 MD |
777 | if (transport) |
778 | module_put(transport->owner); | |
c0e31d2e | 779 | notransport: |
e5382b6d | 780 | active: |
4e3c1b9b MD |
781 | mutex_unlock(&sessions_mutex); |
782 | return NULL; | |
783 | } | |
784 | ||
785 | /* | |
d83004aa JD |
786 | * Only used internally at session destruction for per-cpu channels, and |
787 | * when metadata channel is released. | |
788 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 789 | */ |
aa7c23a9 | 790 | static |
a90917c3 | 791 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 792 | { |
11b5a3c2 | 793 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 794 | module_put(chan->transport->owner); |
4e3c1b9b | 795 | list_del(&chan->list); |
437d5aa5 | 796 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
797 | kfree(chan); |
798 | } | |
799 | ||
d83004aa JD |
800 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
801 | { | |
802 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
803 | ||
804 | /* Protect the metadata cache with the sessions_mutex. */ | |
805 | mutex_lock(&sessions_mutex); | |
806 | _lttng_channel_destroy(chan); | |
807 | mutex_unlock(&sessions_mutex); | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
810 | ||
811 | static | |
812 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
813 | { | |
814 | stream->finalized = 1; | |
815 | wake_up_interruptible(&stream->read_wait); | |
816 | } | |
817 | ||
a101fa10 | 818 | |
e5382b6d MD |
819 | /* |
820 | * Supports event creation while tracing session is active. | |
3c997079 | 821 | * Needs to be called with sessions mutex held. |
e5382b6d | 822 | */ |
a67ba386 | 823 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 824 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 825 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 826 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 827 | { |
3c997079 | 828 | struct lttng_session *session = chan->session; |
a67ba386 MD |
829 | struct lttng_kernel_event_recorder *event_recorder; |
830 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
831 | const char *event_name; |
832 | struct hlist_head *head; | |
3d084699 | 833 | int ret; |
4e3c1b9b | 834 | |
abc0446a | 835 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 836 | ret = -EMFILE; |
e5382b6d | 837 | goto full; |
abc0446a | 838 | } |
3c997079 MD |
839 | |
840 | switch (itype) { | |
606828e4 | 841 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 842 | event_name = event_desc->event_name; |
3c997079 | 843 | break; |
b4a75708 | 844 | |
606828e4 MD |
845 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
846 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
847 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
848 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
849 | event_name = event_param->name; |
850 | break; | |
b4a75708 | 851 | |
606828e4 MD |
852 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
853 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
854 | default: |
855 | WARN_ON_ONCE(1); | |
856 | ret = -EINVAL; | |
857 | goto type_error; | |
858 | } | |
4a11ef1c FD |
859 | |
860 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
861 | LTTNG_EVENT_HT_SIZE, event_name); | |
a67ba386 MD |
862 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
863 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
864 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 865 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 866 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
867 | ret = -EEXIST; |
868 | goto exist; | |
abc0446a MD |
869 | } |
870 | } | |
3c997079 | 871 | |
a67ba386 MD |
872 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
873 | if (!event_recorder) { | |
4cf0bf51 | 874 | ret = -ENOMEM; |
4e3c1b9b | 875 | goto cache_error; |
abc0446a | 876 | } |
a67ba386 MD |
877 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
878 | if (!event_recorder_priv) { | |
879 | ret = -ENOMEM; | |
880 | goto cache_private_error; | |
881 | } | |
882 | event_recorder_priv->pub = event_recorder; | |
883 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
884 | event_recorder->priv = event_recorder_priv; | |
885 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
886 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
887 | ||
8a445457 | 888 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 MD |
889 | event_recorder->chan = chan; |
890 | event_recorder->priv->id = chan->free_event_id++; | |
891 | event_recorder->priv->parent.instrumentation = itype; | |
892 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
893 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
894 | |
895 | switch (itype) { | |
606828e4 | 896 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 897 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
898 | event_recorder->parent.enabled = 0; |
899 | event_recorder->priv->parent.registered = 0; | |
900 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
901 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 902 | ret = -ENOENT; |
d3dbe23c | 903 | goto register_error; |
abc0446a | 904 | } |
3c997079 MD |
905 | /* Populate lttng_event structure before event registration. */ |
906 | smp_wmb(); | |
baf20995 | 907 | break; |
b4a75708 | 908 | |
606828e4 | 909 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
910 | /* |
911 | * Needs to be explicitly enabled after creation, since | |
912 | * we may want to apply filters. | |
913 | */ | |
a67ba386 MD |
914 | event_recorder->parent.enabled = 0; |
915 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
916 | /* |
917 | * Populate lttng_event structure before event | |
918 | * registration. | |
919 | */ | |
920 | smp_wmb(); | |
8bf17deb | 921 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
922 | event_param->u.kprobe.symbol_name, |
923 | event_param->u.kprobe.offset, | |
924 | event_param->u.kprobe.addr, | |
a67ba386 | 925 | event_recorder); |
abc0446a | 926 | if (ret) { |
4cf0bf51 | 927 | ret = -EINVAL; |
d6d808f3 | 928 | goto register_error; |
abc0446a | 929 | } |
a67ba386 | 930 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 931 | WARN_ON_ONCE(!ret); |
d6d808f3 | 932 | break; |
b4a75708 | 933 | |
606828e4 | 934 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 935 | { |
a67ba386 MD |
936 | struct lttng_kernel_event_recorder *event_recorder_return; |
937 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
938 | |
939 | /* kretprobe defines 2 events */ | |
a0493bef MD |
940 | /* |
941 | * Needs to be explicitly enabled after creation, since | |
942 | * we may want to apply filters. | |
943 | */ | |
a67ba386 MD |
944 | event_recorder->parent.enabled = 0; |
945 | event_recorder->priv->parent.registered = 1; | |
946 | ||
947 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
948 | if (!event_recorder_return) { | |
949 | ret = -ENOMEM; | |
950 | goto register_error; | |
951 | } | |
952 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
953 | if (!event_recorder_return_priv) { | |
954 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 955 | ret = -ENOMEM; |
7371f44c | 956 | goto register_error; |
abc0446a | 957 | } |
a67ba386 MD |
958 | event_recorder_return_priv->pub = event_recorder_return; |
959 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
960 | event_recorder_return->priv = event_recorder_return_priv; | |
961 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
962 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
963 | ||
8a445457 | 964 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 MD |
965 | event_recorder_return->chan = chan; |
966 | event_recorder_return->priv->id = chan->free_event_id++; | |
967 | event_recorder_return->priv->parent.instrumentation = itype; | |
968 | event_recorder_return->parent.enabled = 0; | |
969 | event_recorder_return->priv->parent.registered = 1; | |
970 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
971 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 972 | /* |
a90917c3 | 973 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
974 | */ |
975 | smp_wmb(); | |
3c997079 | 976 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
977 | event_param->u.kretprobe.symbol_name, |
978 | event_param->u.kretprobe.offset, | |
979 | event_param->u.kretprobe.addr, | |
a67ba386 | 980 | event_recorder, event_recorder_return); |
7371f44c | 981 | if (ret) { |
a67ba386 MD |
982 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
983 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 984 | ret = -EINVAL; |
7371f44c MD |
985 | goto register_error; |
986 | } | |
987 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 988 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 989 | WARN_ON_ONCE(!ret); |
a67ba386 | 990 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 991 | WARN_ON_ONCE(!ret); |
a90917c3 | 992 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
a67ba386 | 993 | event_recorder_return); |
abc0446a | 994 | WARN_ON_ONCE(ret > 0); |
7371f44c | 995 | if (ret) { |
a67ba386 MD |
996 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
997 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
998 | module_put(event_recorder_return->priv->parent.desc->owner); | |
999 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1000 | goto statedump_error; |
1001 | } | |
a67ba386 | 1002 | list_add(&event_recorder_return->priv->node, &chan->session->events); |
7371f44c MD |
1003 | break; |
1004 | } | |
b4a75708 | 1005 | |
606828e4 | 1006 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1007 | /* |
1008 | * Needs to be explicitly enabled after creation, since | |
1009 | * we may want to apply filters. | |
1010 | */ | |
a67ba386 MD |
1011 | event_recorder->parent.enabled = 0; |
1012 | event_recorder->priv->parent.registered = 0; | |
1013 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1014 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1015 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1016 | ret = -EINVAL; |
1017 | goto register_error; | |
606828e4 | 1018 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1019 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1020 | break; |
606828e4 | 1021 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1022 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1023 | break; |
1024 | } | |
1025 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1026 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1027 | ret = -EINVAL; |
1028 | goto register_error; | |
606828e4 | 1029 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1030 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1031 | break; |
606828e4 | 1032 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1033 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1034 | break; |
1035 | } | |
a67ba386 | 1036 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1037 | ret = -EINVAL; |
259b6cb3 | 1038 | goto register_error; |
abc0446a | 1039 | } |
1ec65de1 | 1040 | break; |
b4a75708 | 1041 | |
606828e4 | 1042 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1043 | /* |
1044 | * Needs to be explicitly enabled after creation, since | |
1045 | * we may want to apply filters. | |
1046 | */ | |
a67ba386 MD |
1047 | event_recorder->parent.enabled = 0; |
1048 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1049 | |
a344f64b FD |
1050 | /* |
1051 | * Populate lttng_event structure before event | |
1052 | * registration. | |
1053 | */ | |
1054 | smp_wmb(); | |
149b9a9d | 1055 | |
83b802dc | 1056 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1057 | event_param->u.uprobe.fd, |
a67ba386 | 1058 | event_recorder); |
149b9a9d YB |
1059 | if (ret) |
1060 | goto register_error; | |
a67ba386 | 1061 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1062 | WARN_ON_ONCE(!ret); |
1063 | break; | |
b4a75708 | 1064 | |
606828e4 MD |
1065 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1066 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1067 | default: |
1068 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1069 | ret = -EINVAL; |
df07930b | 1070 | goto register_error; |
baf20995 | 1071 | } |
a67ba386 | 1072 | ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder); |
abc0446a MD |
1073 | WARN_ON_ONCE(ret > 0); |
1074 | if (ret) { | |
c099397a | 1075 | goto statedump_error; |
abc0446a | 1076 | } |
a67ba386 MD |
1077 | hlist_add_head(&event_recorder->priv->hlist, head); |
1078 | list_add(&event_recorder->priv->node, &chan->session->events); | |
1079 | return event_recorder; | |
4e3c1b9b | 1080 | |
c099397a | 1081 | statedump_error: |
259b6cb3 | 1082 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1083 | register_error: |
a67ba386 MD |
1084 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1085 | cache_private_error: | |
1086 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1087 | cache_error: |
1088 | exist: | |
3c997079 | 1089 | type_error: |
e5382b6d | 1090 | full: |
4cf0bf51 | 1091 | return ERR_PTR(ret); |
4e3c1b9b MD |
1092 | } |
1093 | ||
a67ba386 | 1094 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1095 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1096 | uint64_t token, uint64_t error_counter_index, |
1097 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1098 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1099 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1100 | { |
a67ba386 MD |
1101 | struct lttng_kernel_event_notifier *event_notifier; |
1102 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1103 | struct lttng_counter *error_counter; |
dffef45d FD |
1104 | const char *event_name; |
1105 | struct hlist_head *head; | |
1106 | int ret; | |
1107 | ||
1108 | switch (itype) { | |
606828e4 | 1109 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1110 | event_name = event_desc->event_name; |
b01155ba | 1111 | break; |
b4a75708 | 1112 | |
606828e4 MD |
1113 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1114 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1115 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1116 | event_name = event_notifier_param->event.name; |
1117 | break; | |
b4a75708 | 1118 | |
606828e4 MD |
1119 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1120 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1121 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1122 | default: |
1123 | WARN_ON_ONCE(1); | |
1124 | ret = -EINVAL; | |
1125 | goto type_error; | |
1126 | } | |
1127 | ||
1128 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1129 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1130 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1131 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1132 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1133 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1134 | && event_notifier_group == event_notifier_priv->group |
1135 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1136 | ret = -EEXIST; |
1137 | goto exist; | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1142 | if (!event_notifier) { | |
1143 | ret = -ENOMEM; | |
1144 | goto cache_error; | |
1145 | } | |
a67ba386 MD |
1146 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1147 | if (!event_notifier_priv) { | |
1148 | ret = -ENOMEM; | |
1149 | goto cache_private_error; | |
1150 | } | |
1151 | event_notifier_priv->pub = event_notifier; | |
1152 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1153 | event_notifier->priv = event_notifier_priv; | |
1154 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1155 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1156 | ||
1157 | event_notifier->priv->group = event_notifier_group; | |
1158 | event_notifier->priv->parent.user_token = token; | |
1159 | event_notifier->priv->error_counter_index = error_counter_index; | |
1160 | event_notifier->priv->num_captures = 0; | |
1161 | event_notifier->priv->parent.instrumentation = itype; | |
1162 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1163 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1164 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1165 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1166 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1167 | |
1168 | switch (itype) { | |
606828e4 | 1169 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1170 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1171 | event_notifier->parent.enabled = 0; |
1172 | event_notifier->priv->parent.registered = 0; | |
1173 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1174 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1175 | ret = -ENOENT; |
1176 | goto register_error; | |
1177 | } | |
1178 | /* Populate lttng_event_notifier structure before event registration. */ | |
1179 | smp_wmb(); | |
1180 | break; | |
b4a75708 | 1181 | |
606828e4 | 1182 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1183 | /* |
1184 | * Needs to be explicitly enabled after creation, since | |
1185 | * we may want to apply filters. | |
1186 | */ | |
a67ba386 MD |
1187 | event_notifier->parent.enabled = 0; |
1188 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1189 | /* |
1190 | * Populate lttng_event_notifier structure before event | |
1191 | * registration. | |
1192 | */ | |
1193 | smp_wmb(); | |
1194 | ret = lttng_kprobes_register_event_notifier( | |
1195 | event_notifier_param->event.u.kprobe.symbol_name, | |
1196 | event_notifier_param->event.u.kprobe.offset, | |
1197 | event_notifier_param->event.u.kprobe.addr, | |
1198 | event_notifier); | |
1199 | if (ret) { | |
1200 | ret = -EINVAL; | |
1201 | goto register_error; | |
1202 | } | |
a67ba386 | 1203 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1204 | WARN_ON_ONCE(!ret); |
1205 | break; | |
b4a75708 | 1206 | |
606828e4 | 1207 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1208 | /* |
1209 | * Needs to be explicitly enabled after creation, since | |
1210 | * we may want to apply filters. | |
1211 | */ | |
a67ba386 MD |
1212 | event_notifier->parent.enabled = 0; |
1213 | event_notifier->priv->parent.registered = 0; | |
1214 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1215 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1216 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1217 | ret = -EINVAL; |
1218 | goto register_error; | |
606828e4 | 1219 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1220 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1221 | break; |
606828e4 | 1222 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1223 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1224 | break; |
1225 | } | |
1226 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1227 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1228 | ret = -EINVAL; |
1229 | goto register_error; | |
606828e4 | 1230 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1231 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1232 | break; |
606828e4 | 1233 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1234 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1235 | break; |
1236 | } | |
1237 | ||
a67ba386 | 1238 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1239 | ret = -EINVAL; |
1240 | goto register_error; | |
1241 | } | |
1242 | break; | |
b4a75708 | 1243 | |
606828e4 | 1244 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1245 | /* |
1246 | * Needs to be explicitly enabled after creation, since | |
1247 | * we may want to apply filters. | |
1248 | */ | |
a67ba386 MD |
1249 | event_notifier->parent.enabled = 0; |
1250 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1251 | |
1252 | /* | |
1253 | * Populate lttng_event_notifier structure before | |
1254 | * event_notifier registration. | |
1255 | */ | |
1256 | smp_wmb(); | |
1257 | ||
1258 | ret = lttng_uprobes_register_event_notifier( | |
1259 | event_notifier_param->event.name, | |
1260 | event_notifier_param->event.u.uprobe.fd, | |
1261 | event_notifier); | |
1262 | if (ret) | |
1263 | goto register_error; | |
a67ba386 | 1264 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1265 | WARN_ON_ONCE(!ret); |
1266 | break; | |
b4a75708 | 1267 | |
606828e4 MD |
1268 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1269 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1270 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1271 | default: |
1272 | WARN_ON_ONCE(1); | |
1273 | ret = -EINVAL; | |
1274 | goto register_error; | |
1275 | } | |
1276 | ||
a67ba386 MD |
1277 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1278 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1279 | |
1280 | /* | |
1281 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1282 | * bucket is currently in use. We trust it. The session lock |
1283 | * synchronizes against concurrent creation of the error | |
1284 | * counter. | |
99f52fcc | 1285 | */ |
ab04d7b1 MD |
1286 | error_counter = event_notifier_group->error_counter; |
1287 | if (error_counter) { | |
99f52fcc FD |
1288 | size_t dimension_index[1]; |
1289 | ||
1290 | /* | |
1291 | * Check that the index is within the boundary of the counter. | |
1292 | */ | |
a67ba386 | 1293 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1294 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1295 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1296 | ret = -EINVAL; |
1297 | goto register_error; | |
1298 | } | |
1299 | ||
a67ba386 | 1300 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1301 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1302 | if (ret) { |
1303 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1304 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1305 | goto register_error; |
1306 | } | |
1307 | } | |
1308 | ||
dffef45d FD |
1309 | return event_notifier; |
1310 | ||
1311 | register_error: | |
a67ba386 MD |
1312 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1313 | cache_private_error: | |
dffef45d FD |
1314 | kmem_cache_free(event_notifier_cache, event_notifier); |
1315 | cache_error: | |
1316 | exist: | |
1317 | type_error: | |
1318 | return ERR_PTR(ret); | |
1319 | } | |
1320 | ||
99f52fcc FD |
1321 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1322 | const size_t *dim_indexes, int32_t cpu, | |
1323 | int64_t *val, bool *overflow, bool *underflow) | |
1324 | { | |
1325 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1326 | cpu, val, overflow, underflow); | |
1327 | } | |
1328 | ||
1329 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1330 | const size_t *dim_indexes, int64_t *val, | |
1331 | bool *overflow, bool *underflow) | |
1332 | { | |
1333 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1334 | val, overflow, underflow); | |
1335 | } | |
1336 | ||
1337 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1338 | const size_t *dim_indexes) | |
1339 | { | |
1340 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1341 | } | |
1342 | ||
a67ba386 | 1343 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 1344 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1345 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1346 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1347 | { |
a67ba386 | 1348 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1349 | |
1350 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1351 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1352 | mutex_unlock(&sessions_mutex); |
1353 | return event; | |
1354 | } | |
1355 | ||
a67ba386 | 1356 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1357 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1358 | uint64_t id, uint64_t error_counter_index, |
1359 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1360 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1361 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1362 | { |
a67ba386 | 1363 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1364 | |
1365 | mutex_lock(&sessions_mutex); | |
1366 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1367 | error_counter_index, event_notifier_group, |
a67ba386 | 1368 | event_notifier_param, itype); |
dffef45d FD |
1369 | mutex_unlock(&sessions_mutex); |
1370 | return event_notifier; | |
1371 | } | |
1372 | ||
3c997079 MD |
1373 | /* Only used for tracepoints for now. */ |
1374 | static | |
a67ba386 | 1375 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1376 | { |
437d5aa5 | 1377 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1378 | int ret = -EINVAL; |
3c997079 | 1379 | |
a67ba386 | 1380 | if (event_recorder->priv->parent.registered) |
3c997079 | 1381 | return; |
4ecb5ad5 | 1382 | |
a67ba386 MD |
1383 | desc = event_recorder->priv->parent.desc; |
1384 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1385 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1386 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 | 1387 | desc->probe_callback, |
a67ba386 | 1388 | event_recorder); |
4ecb5ad5 | 1389 | break; |
b4a75708 | 1390 | |
606828e4 | 1391 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1392 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1393 | break; |
b4a75708 | 1394 | |
606828e4 MD |
1395 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1396 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1397 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1398 | ret = 0; |
1399 | break; | |
b4a75708 | 1400 | |
606828e4 MD |
1401 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1402 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1403 | default: |
1404 | WARN_ON_ONCE(1); | |
1405 | } | |
3c997079 | 1406 | if (!ret) |
a67ba386 | 1407 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1408 | } |
1409 | ||
4e3c1b9b MD |
1410 | /* |
1411 | * Only used internally at session destruction. | |
1412 | */ | |
a67ba386 | 1413 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1414 | { |
a67ba386 | 1415 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1416 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1417 | int ret = -EINVAL; |
1418 | ||
a67ba386 | 1419 | if (!event_priv->registered) |
3c997079 MD |
1420 | return 0; |
1421 | ||
a67ba386 MD |
1422 | desc = event_priv->desc; |
1423 | switch (event_priv->instrumentation) { | |
606828e4 | 1424 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1425 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
1426 | event_priv->desc->probe_callback, | |
1427 | event_recorder); | |
baf20995 | 1428 | break; |
b4a75708 | 1429 | |
606828e4 | 1430 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1431 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1432 | ret = 0; |
1433 | break; | |
b4a75708 | 1434 | |
606828e4 | 1435 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1436 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1437 | ret = 0; |
1438 | break; | |
b4a75708 | 1439 | |
606828e4 | 1440 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1441 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1442 | break; |
b4a75708 | 1443 | |
606828e4 | 1444 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1445 | ret = 0; |
1446 | break; | |
b4a75708 | 1447 | |
606828e4 | 1448 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1449 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1450 | ret = 0; |
1451 | break; | |
b4a75708 | 1452 | |
606828e4 | 1453 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1454 | default: |
1455 | WARN_ON_ONCE(1); | |
1456 | } | |
3c997079 | 1457 | if (!ret) |
a67ba386 | 1458 | event_priv->registered = 0; |
dda6a249 MD |
1459 | return ret; |
1460 | } | |
1461 | ||
dffef45d FD |
1462 | /* Only used for tracepoints for now. */ |
1463 | static | |
a67ba386 | 1464 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1465 | { |
437d5aa5 | 1466 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1467 | int ret = -EINVAL; |
1468 | ||
a67ba386 | 1469 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1470 | return; |
1471 | ||
a67ba386 MD |
1472 | desc = event_notifier->priv->parent.desc; |
1473 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1474 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1475 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e2d5dbc7 | 1476 | desc->probe_callback, |
b01155ba FD |
1477 | event_notifier); |
1478 | break; | |
b4a75708 | 1479 | |
606828e4 | 1480 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1481 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1482 | break; | |
b4a75708 | 1483 | |
606828e4 MD |
1484 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1485 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1486 | ret = 0; |
1487 | break; | |
b4a75708 | 1488 | |
606828e4 MD |
1489 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1490 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1491 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1492 | default: |
1493 | WARN_ON_ONCE(1); | |
1494 | } | |
1495 | if (!ret) | |
a67ba386 | 1496 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1497 | } |
1498 | ||
1499 | static | |
1500 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1501 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1502 | { |
437d5aa5 | 1503 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1504 | int ret = -EINVAL; |
1505 | ||
a67ba386 | 1506 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1507 | return 0; |
1508 | ||
a67ba386 MD |
1509 | desc = event_notifier->priv->parent.desc; |
1510 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1511 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1512 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e2d5dbc7 | 1513 | event_notifier->priv->parent.desc->probe_callback, |
b01155ba FD |
1514 | event_notifier); |
1515 | break; | |
b4a75708 | 1516 | |
606828e4 | 1517 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1518 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1519 | ret = 0; | |
1520 | break; | |
b4a75708 | 1521 | |
606828e4 | 1522 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1523 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1524 | ret = 0; | |
1525 | break; | |
b4a75708 | 1526 | |
606828e4 | 1527 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1528 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1529 | break; | |
b4a75708 | 1530 | |
606828e4 MD |
1531 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1532 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1533 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1534 | default: |
1535 | WARN_ON_ONCE(1); | |
1536 | } | |
1537 | if (!ret) | |
a67ba386 | 1538 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1539 | return ret; |
1540 | } | |
1541 | ||
dda6a249 MD |
1542 | /* |
1543 | * Only used internally at session destruction. | |
1544 | */ | |
be066e6c | 1545 | static |
0648898e | 1546 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1547 | { |
0648898e | 1548 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1549 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1550 | ||
0648898e MD |
1551 | lttng_free_event_filter_runtime(event); |
1552 | /* Free event enabler refs */ | |
1553 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1554 | &event_priv->enablers_ref_head, node) | |
1555 | kfree(enabler_ref); | |
b4a75708 | 1556 | |
0648898e MD |
1557 | switch (event->type) { |
1558 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1559 | { | |
1560 | struct lttng_kernel_event_recorder *event_recorder = | |
1561 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1562 | |
0648898e MD |
1563 | switch (event_priv->instrumentation) { |
1564 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1565 | lttng_event_desc_put(event_priv->desc); | |
1566 | break; | |
b4a75708 | 1567 | |
0648898e MD |
1568 | case LTTNG_KERNEL_ABI_KPROBE: |
1569 | module_put(event_priv->desc->owner); | |
1570 | lttng_kprobes_destroy_event_private(event_recorder); | |
1571 | break; | |
b4a75708 | 1572 | |
0648898e MD |
1573 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1574 | module_put(event_priv->desc->owner); | |
1575 | lttng_kretprobes_destroy_private(event_recorder); | |
1576 | break; | |
b4a75708 | 1577 | |
0648898e MD |
1578 | case LTTNG_KERNEL_ABI_SYSCALL: |
1579 | break; | |
4e3c1b9b | 1580 | |
0648898e MD |
1581 | case LTTNG_KERNEL_ABI_UPROBE: |
1582 | module_put(event_priv->desc->owner); | |
1583 | lttng_uprobes_destroy_event_private(event_recorder); | |
1584 | break; | |
3ef5cc03 | 1585 | |
0648898e MD |
1586 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1587 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1588 | default: | |
1589 | WARN_ON_ONCE(1); | |
1590 | } | |
1591 | list_del(&event_recorder->priv->node); | |
1592 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1593 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1594 | break; |
0648898e MD |
1595 | } |
1596 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1597 | { | |
1598 | struct lttng_kernel_event_notifier *event_notifier = | |
1599 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1600 | |
0648898e MD |
1601 | switch (event_notifier->priv->parent.instrumentation) { |
1602 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1603 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1604 | break; | |
b4a75708 | 1605 | |
0648898e MD |
1606 | case LTTNG_KERNEL_ABI_KPROBE: |
1607 | module_put(event_notifier->priv->parent.desc->owner); | |
1608 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1609 | break; | |
b4a75708 | 1610 | |
0648898e MD |
1611 | case LTTNG_KERNEL_ABI_SYSCALL: |
1612 | break; | |
b4a75708 | 1613 | |
0648898e MD |
1614 | case LTTNG_KERNEL_ABI_UPROBE: |
1615 | module_put(event_notifier->priv->parent.desc->owner); | |
1616 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1617 | break; | |
1618 | ||
1619 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1620 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1621 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1622 | default: | |
1623 | WARN_ON_ONCE(1); | |
1624 | } | |
1625 | list_del(&event_notifier->priv->node); | |
1626 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1627 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1628 | break; | |
1629 | } | |
dffef45d FD |
1630 | default: |
1631 | WARN_ON_ONCE(1); | |
1632 | } | |
dffef45d FD |
1633 | } |
1634 | ||
d1f652f8 MD |
1635 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1636 | enum tracker_type tracker_type) | |
e0130fab | 1637 | { |
d1f652f8 MD |
1638 | switch (tracker_type) { |
1639 | case TRACKER_PID: | |
1640 | return &session->pid_tracker; | |
1641 | case TRACKER_VPID: | |
1642 | return &session->vpid_tracker; | |
1643 | case TRACKER_UID: | |
1644 | return &session->uid_tracker; | |
1645 | case TRACKER_VUID: | |
1646 | return &session->vuid_tracker; | |
1647 | case TRACKER_GID: | |
1648 | return &session->gid_tracker; | |
1649 | case TRACKER_VGID: | |
1650 | return &session->vgid_tracker; | |
1651 | default: | |
1652 | WARN_ON_ONCE(1); | |
1653 | return NULL; | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | int lttng_session_track_id(struct lttng_session *session, | |
1658 | enum tracker_type tracker_type, int id) | |
1659 | { | |
1660 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1661 | int ret; |
1662 | ||
d1f652f8 MD |
1663 | tracker = get_tracker(session, tracker_type); |
1664 | if (!tracker) | |
1665 | return -EINVAL; | |
1666 | if (id < -1) | |
e0130fab MD |
1667 | return -EINVAL; |
1668 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1669 | if (id == -1) { |
1670 | /* track all ids: destroy tracker. */ | |
1671 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1672 | ret = 0; |
1673 | } else { | |
d1f652f8 | 1674 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1675 | } |
e0130fab MD |
1676 | mutex_unlock(&sessions_mutex); |
1677 | return ret; | |
1678 | } | |
1679 | ||
d1f652f8 MD |
1680 | int lttng_session_untrack_id(struct lttng_session *session, |
1681 | enum tracker_type tracker_type, int id) | |
e0130fab | 1682 | { |
d1f652f8 | 1683 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1684 | int ret; |
1685 | ||
d1f652f8 MD |
1686 | tracker = get_tracker(session, tracker_type); |
1687 | if (!tracker) | |
1688 | return -EINVAL; | |
1689 | if (id < -1) | |
e0130fab MD |
1690 | return -EINVAL; |
1691 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1692 | if (id == -1) { |
1693 | /* untrack all ids: replace by empty tracker. */ | |
1694 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1695 | } else { |
d1f652f8 | 1696 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1697 | } |
e0130fab MD |
1698 | mutex_unlock(&sessions_mutex); |
1699 | return ret; | |
1700 | } | |
1701 | ||
7e6f9ef6 | 1702 | static |
d1f652f8 | 1703 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1704 | { |
d1f652f8 MD |
1705 | struct lttng_id_tracker *id_tracker = m->private; |
1706 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1707 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1708 | int iter = 0, i; |
1709 | ||
1710 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1711 | if (id_tracker_p) { |
1712 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1713 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1714 | |
f934e302 | 1715 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1716 | if (iter++ >= *pos) |
1717 | return e; | |
1718 | } | |
1719 | } | |
1720 | } else { | |
d1f652f8 | 1721 | /* ID tracker disabled. */ |
7e6f9ef6 | 1722 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1723 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1724 | } |
1725 | iter++; | |
1726 | } | |
1727 | /* End of list */ | |
1728 | return NULL; | |
1729 | } | |
1730 | ||
1731 | /* Called with sessions_mutex held. */ | |
1732 | static | |
d1f652f8 | 1733 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1734 | { |
d1f652f8 MD |
1735 | struct lttng_id_tracker *id_tracker = m->private; |
1736 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1737 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1738 | int iter = 0, i; |
1739 | ||
1740 | (*ppos)++; | |
d1f652f8 MD |
1741 | if (id_tracker_p) { |
1742 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1743 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1744 | |
f934e302 | 1745 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1746 | if (iter++ >= *ppos) |
1747 | return e; | |
1748 | } | |
1749 | } | |
1750 | } else { | |
d1f652f8 | 1751 | /* ID tracker disabled. */ |
7e6f9ef6 | 1752 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1753 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1754 | iter++; |
1755 | } | |
1756 | ||
1757 | /* End of list */ | |
1758 | return NULL; | |
1759 | } | |
1760 | ||
1761 | static | |
d1f652f8 | 1762 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1763 | { |
1764 | mutex_unlock(&sessions_mutex); | |
1765 | } | |
1766 | ||
1767 | static | |
d1f652f8 | 1768 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1769 | { |
d1f652f8 MD |
1770 | struct lttng_id_tracker *id_tracker = m->private; |
1771 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1772 | int id; | |
7e6f9ef6 | 1773 | |
d1f652f8 | 1774 | if (p == id_tracker_p) { |
7e6f9ef6 | 1775 | /* Tracker disabled. */ |
d1f652f8 | 1776 | id = -1; |
7e6f9ef6 | 1777 | } else { |
d1f652f8 | 1778 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1779 | |
d1f652f8 MD |
1780 | id = lttng_id_tracker_get_node_id(e); |
1781 | } | |
1782 | switch (id_tracker->tracker_type) { | |
1783 | case TRACKER_PID: | |
1784 | seq_printf(m, "process { pid = %d; };\n", id); | |
1785 | break; | |
1786 | case TRACKER_VPID: | |
1787 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1788 | break; | |
1789 | case TRACKER_UID: | |
1790 | seq_printf(m, "user { uid = %d; };\n", id); | |
1791 | break; | |
1792 | case TRACKER_VUID: | |
1793 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1794 | break; | |
1795 | case TRACKER_GID: | |
1796 | seq_printf(m, "group { gid = %d; };\n", id); | |
1797 | break; | |
1798 | case TRACKER_VGID: | |
1799 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1800 | break; | |
1801 | default: | |
1802 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1803 | } |
7e6f9ef6 MD |
1804 | return 0; |
1805 | } | |
1806 | ||
1807 | static | |
d1f652f8 MD |
1808 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1809 | .start = id_list_start, | |
1810 | .next = id_list_next, | |
1811 | .stop = id_list_stop, | |
1812 | .show = id_list_show, | |
7e6f9ef6 MD |
1813 | }; |
1814 | ||
1815 | static | |
d1f652f8 | 1816 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1817 | { |
d1f652f8 | 1818 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1819 | } |
1820 | ||
1821 | static | |
d1f652f8 | 1822 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1823 | { |
1824 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1825 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1826 | int ret; |
1827 | ||
d1f652f8 | 1828 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1829 | ret = seq_release(inode, file); |
d1f652f8 MD |
1830 | if (!ret) |
1831 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1832 | return ret; |
1833 | } | |
1834 | ||
d1f652f8 | 1835 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1836 | .owner = THIS_MODULE, |
d1f652f8 | 1837 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1838 | .read = seq_read, |
1839 | .llseek = seq_lseek, | |
d1f652f8 | 1840 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1841 | }; |
1842 | ||
d1f652f8 MD |
1843 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1844 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1845 | { |
d1f652f8 | 1846 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1847 | struct seq_file *m; |
1848 | int file_fd, ret; | |
1849 | ||
1850 | file_fd = lttng_get_unused_fd(); | |
1851 | if (file_fd < 0) { | |
1852 | ret = file_fd; | |
1853 | goto fd_error; | |
1854 | } | |
1855 | ||
d1f652f8 MD |
1856 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1857 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1858 | NULL, O_RDWR); |
d1f652f8 MD |
1859 | if (IS_ERR(tracker_ids_list_file)) { |
1860 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1861 | goto file_error; |
1862 | } | |
98d7281c MJ |
1863 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1864 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1865 | goto refcount_error; |
1866 | } | |
d1f652f8 | 1867 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1868 | if (ret < 0) |
1869 | goto open_error; | |
d1f652f8 MD |
1870 | m = tracker_ids_list_file->private_data; |
1871 | ||
1872 | m->private = get_tracker(session, tracker_type); | |
1873 | BUG_ON(!m->private); | |
1874 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1875 | |
1876 | return file_fd; | |
1877 | ||
1878 | open_error: | |
9c1f4643 MD |
1879 | atomic_long_dec(&session->file->f_count); |
1880 | refcount_error: | |
d1f652f8 | 1881 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1882 | file_error: |
1883 | put_unused_fd(file_fd); | |
1884 | fd_error: | |
1885 | return ret; | |
1886 | } | |
1887 | ||
3c997079 MD |
1888 | /* |
1889 | * Enabler management. | |
1890 | */ | |
1891 | static | |
4993071a PP |
1892 | int lttng_match_enabler_star_glob(const char *desc_name, |
1893 | const char *pattern) | |
3c997079 | 1894 | { |
cbc19040 MD |
1895 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1896 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1897 | return 0; |
1898 | return 1; | |
1899 | } | |
1900 | ||
1901 | static | |
4ecb5ad5 MD |
1902 | int lttng_match_enabler_name(const char *desc_name, |
1903 | const char *name) | |
3c997079 | 1904 | { |
4ecb5ad5 | 1905 | if (strcmp(desc_name, name)) |
3c997079 MD |
1906 | return 0; |
1907 | return 1; | |
1908 | } | |
1909 | ||
437d5aa5 | 1910 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1911 | struct lttng_enabler *enabler) |
1912 | { | |
4ecb5ad5 | 1913 | const char *desc_name, *enabler_name; |
badfe9f5 | 1914 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1915 | |
1916 | enabler_name = enabler->event_param.name; | |
1917 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1918 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1919 | desc_name = desc->event_name; |
3b861b22 FD |
1920 | switch (enabler->format_type) { |
1921 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1922 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1923 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1924 | return lttng_match_enabler_name(desc_name, enabler_name); |
1925 | default: | |
1926 | return -EINVAL; | |
1927 | } | |
4ecb5ad5 | 1928 | break; |
b4a75708 | 1929 | |
606828e4 | 1930 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1931 | desc_name = desc->event_name; |
badfe9f5 | 1932 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1933 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1934 | compat = true; |
1935 | } | |
4ecb5ad5 MD |
1936 | if (!strncmp(desc_name, "syscall_exit_", |
1937 | strlen("syscall_exit_"))) { | |
1938 | desc_name += strlen("syscall_exit_"); | |
1939 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1940 | strlen("syscall_entry_"))) { | |
1941 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1942 | entry = true; |
4ecb5ad5 MD |
1943 | } else { |
1944 | WARN_ON_ONCE(1); | |
1945 | return -EINVAL; | |
1946 | } | |
badfe9f5 | 1947 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1948 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1949 | break; |
606828e4 | 1950 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1951 | if (!entry) |
1952 | return 0; | |
1953 | break; | |
606828e4 | 1954 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1955 | if (entry) |
1956 | return 0; | |
1957 | break; | |
1958 | default: | |
1959 | return -EINVAL; | |
1960 | } | |
1961 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1962 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1963 | break; |
606828e4 | 1964 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1965 | if (compat) |
1966 | return 0; | |
1967 | break; | |
606828e4 | 1968 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1969 | if (!compat) |
1970 | return 0; | |
1971 | break; | |
1972 | default: | |
1973 | return -EINVAL; | |
1974 | } | |
1975 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1976 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1977 | switch (enabler->format_type) { |
1978 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1979 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1980 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1981 | return lttng_match_enabler_name(desc_name, enabler_name); |
1982 | default: | |
1983 | return -EINVAL; | |
1984 | } | |
1985 | break; | |
606828e4 | 1986 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1987 | return -EINVAL; /* Not implemented. */ |
1988 | default: | |
1989 | return -EINVAL; | |
1990 | } | |
4ecb5ad5 | 1991 | break; |
b4a75708 | 1992 | |
4ecb5ad5 MD |
1993 | default: |
1994 | WARN_ON_ONCE(1); | |
1995 | return -EINVAL; | |
1996 | } | |
3c997079 MD |
1997 | } |
1998 | ||
1999 | static | |
b2bc0bc8 | 2000 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2001 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2002 | { |
b2bc0bc8 FD |
2003 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2004 | event_enabler); | |
2005 | ||
a67ba386 | 2006 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2007 | return 0; |
a67ba386 MD |
2008 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2009 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2010 | return 1; |
2011 | else | |
2012 | return 0; | |
2013 | } | |
2014 | ||
b01155ba FD |
2015 | static |
2016 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2017 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2018 | { |
2019 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2020 | event_notifier_enabler); | |
2021 | ||
a67ba386 | 2022 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2023 | return 0; |
a67ba386 MD |
2024 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2025 | && event_notifier->priv->group == event_notifier_enabler->group | |
2026 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2027 | return 1; |
2028 | else | |
2029 | return 0; | |
2030 | } | |
2031 | ||
3c997079 | 2032 | static |
b2bc0bc8 FD |
2033 | struct lttng_enabler_ref *lttng_enabler_ref( |
2034 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2035 | struct lttng_enabler *enabler) |
2036 | { | |
2037 | struct lttng_enabler_ref *enabler_ref; | |
2038 | ||
b2bc0bc8 | 2039 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2040 | if (enabler_ref->ref == enabler) |
2041 | return enabler_ref; | |
2042 | } | |
2043 | return NULL; | |
2044 | } | |
2045 | ||
3c997079 | 2046 | static |
1b917d6b | 2047 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2048 | { |
b2bc0bc8 | 2049 | struct lttng_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2050 | struct lttng_kernel_probe_desc *probe_desc; |
2051 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2052 | int i; |
2053 | struct list_head *probe_list; | |
2054 | ||
2055 | probe_list = lttng_get_probe_list_head(); | |
2056 | /* | |
2057 | * For each probe event, if we find that a probe event matches | |
2058 | * our enabler, create an associated lttng_event if not | |
2059 | * already present. | |
2060 | */ | |
2061 | list_for_each_entry(probe_desc, probe_list, head) { | |
2062 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2063 | int found = 0; | |
2064 | struct hlist_head *head; | |
a67ba386 MD |
2065 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2066 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2067 | |
2068 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2069 | if (!lttng_desc_match_enabler(desc, |
2070 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2071 | continue; |
3c997079 MD |
2072 | |
2073 | /* | |
2074 | * Check if already created. | |
2075 | */ | |
4a11ef1c FD |
2076 | head = utils_borrow_hash_table_bucket( |
2077 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 2078 | desc->event_name); |
a67ba386 MD |
2079 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2080 | if (event_recorder_private->parent.desc == desc | |
2081 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2082 | found = 1; |
2083 | } | |
2084 | if (found) | |
2085 | continue; | |
2086 | ||
2087 | /* | |
2088 | * We need to create an event for this | |
2089 | * event probe. | |
2090 | */ | |
a67ba386 MD |
2091 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2092 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2093 | if (!event_recorder) { | |
5a15f70c | 2094 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2095 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2096 | } |
2097 | } | |
2098 | } | |
2099 | } | |
2100 | ||
b01155ba FD |
2101 | static |
2102 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2103 | { | |
2104 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2105 | struct lttng_kernel_probe_desc *probe_desc; |
2106 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2107 | int i; |
2108 | struct list_head *probe_list; | |
2109 | ||
2110 | probe_list = lttng_get_probe_list_head(); | |
2111 | /* | |
2112 | * For each probe event, if we find that a probe event matches | |
2113 | * our enabler, create an associated lttng_event_notifier if not | |
2114 | * already present. | |
2115 | */ | |
2116 | list_for_each_entry(probe_desc, probe_list, head) { | |
2117 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2118 | int found = 0; | |
2119 | struct hlist_head *head; | |
a67ba386 MD |
2120 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2121 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2122 | |
2123 | desc = probe_desc->event_desc[i]; | |
2124 | if (!lttng_desc_match_enabler(desc, | |
2125 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2126 | continue; | |
2127 | ||
2128 | /* | |
2129 | * Check if already created. | |
2130 | */ | |
2131 | head = utils_borrow_hash_table_bucket( | |
2132 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2133 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2134 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2135 | if (event_notifier_priv->parent.desc == desc | |
2136 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2137 | found = 1; |
2138 | } | |
2139 | if (found) | |
2140 | continue; | |
2141 | ||
2142 | /* | |
2143 | * We need to create a event_notifier for this event probe. | |
2144 | */ | |
2145 | event_notifier = _lttng_event_notifier_create(desc, | |
2146 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2147 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2148 | event_notifier_group, NULL, |
606828e4 | 2149 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2150 | if (IS_ERR(event_notifier)) { |
2151 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2152 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2153 | } |
2154 | } | |
2155 | } | |
2156 | } | |
2157 | ||
33a39a3c | 2158 | static |
1b917d6b | 2159 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2160 | { |
2161 | int ret; | |
2162 | ||
a67ba386 | 2163 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2164 | WARN_ON_ONCE(ret); |
2165 | } | |
2166 | ||
8a8ac9a8 FD |
2167 | static |
2168 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2169 | { | |
2170 | int ret; | |
2171 | ||
a67ba386 | 2172 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2173 | WARN_ON_ONCE(ret); |
a67ba386 | 2174 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2175 | WARN_ON_ONCE(ret); |
2176 | } | |
2177 | ||
33a39a3c | 2178 | /* |
a67ba386 | 2179 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2180 | * tracepoint probes. |
2181 | * Should be called with sessions mutex held. | |
2182 | */ | |
2183 | static | |
b2bc0bc8 | 2184 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2185 | { |
b2bc0bc8 | 2186 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2187 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2188 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2189 | break; |
b4a75708 | 2190 | |
606828e4 | 2191 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2192 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2193 | break; |
b4a75708 | 2194 | |
33a39a3c MD |
2195 | default: |
2196 | WARN_ON_ONCE(1); | |
2197 | break; | |
2198 | } | |
2199 | } | |
2200 | ||
3c997079 | 2201 | /* |
b2bc0bc8 | 2202 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2203 | * and add backward reference from the event to the enabler. |
2204 | * Should be called with sessions mutex held. | |
2205 | */ | |
2206 | static | |
b2bc0bc8 | 2207 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2208 | { |
b2bc0bc8 FD |
2209 | struct lttng_channel *chan = event_enabler->chan; |
2210 | struct lttng_session *session = event_enabler->chan->session; | |
2211 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
a67ba386 | 2212 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2213 | |
606828e4 MD |
2214 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2215 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2216 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2217 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2218 | int enabled = base_enabler->enabled; |
606828e4 | 2219 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2220 | |
606828e4 | 2221 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 MD |
2222 | WRITE_ONCE(chan->syscall_all_entry, enabled); |
2223 | ||
606828e4 | 2224 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 | 2225 | WRITE_ONCE(chan->syscall_all_exit, enabled); |
badfe9f5 MD |
2226 | } |
2227 | ||
3c997079 | 2228 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2229 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2230 | |
b2bc0bc8 | 2231 | /* For each event matching event_enabler in session event list. */ |
a67ba386 MD |
2232 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2233 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 MD |
2234 | struct lttng_enabler_ref *enabler_ref; |
2235 | ||
a67ba386 | 2236 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2237 | continue; |
a67ba386 | 2238 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2239 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2240 | if (!enabler_ref) { |
2241 | /* | |
2242 | * If no backward ref, create it. | |
b2bc0bc8 | 2243 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2244 | */ |
2245 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2246 | if (!enabler_ref) | |
2247 | return -ENOMEM; | |
b2bc0bc8 | 2248 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2249 | list_add(&enabler_ref->node, |
a67ba386 | 2250 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2251 | } |
2252 | ||
f127e61e MD |
2253 | /* |
2254 | * Link filter bytecodes if not linked yet. | |
2255 | */ | |
a67ba386 | 2256 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2257 | lttng_static_ctx, |
a67ba386 | 2258 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2259 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2260 | } |
2261 | return 0; | |
2262 | } | |
2263 | ||
b01155ba | 2264 | /* |
a67ba386 | 2265 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2266 | * tracepoint probes. |
2267 | * Should be called with sessions mutex held. | |
2268 | */ | |
2269 | static | |
2270 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2271 | { | |
2272 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2273 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2274 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2275 | break; | |
b4a75708 | 2276 | |
606828e4 | 2277 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2278 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2279 | break; | |
b4a75708 | 2280 | |
b01155ba FD |
2281 | default: |
2282 | WARN_ON_ONCE(1); | |
2283 | break; | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | /* | |
2288 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2289 | */ | |
2290 | static | |
8a8ac9a8 FD |
2291 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2292 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2293 | { |
2294 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2295 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2296 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2297 | |
606828e4 MD |
2298 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2299 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2300 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2301 | !strcmp(base_enabler->event_param.name, "*")) { |
2302 | ||
2303 | int enabled = base_enabler->enabled; | |
606828e4 | 2304 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2305 | |
606828e4 | 2306 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2307 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2308 | ||
606828e4 | 2309 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2310 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2311 | ||
2312 | } | |
2313 | ||
b01155ba FD |
2314 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2315 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2316 | ||
2317 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2318 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2319 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2320 | struct lttng_enabler_ref *enabler_ref; |
2321 | ||
2322 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2323 | continue; | |
2324 | ||
a67ba386 | 2325 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2326 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2327 | if (!enabler_ref) { | |
2328 | /* | |
2329 | * If no backward ref, create it. | |
2330 | * Add backward ref from event_notifier to enabler. | |
2331 | */ | |
2332 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2333 | if (!enabler_ref) | |
2334 | return -ENOMEM; | |
2335 | ||
2336 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2337 | event_notifier_enabler); | |
2338 | list_add(&enabler_ref->node, | |
a67ba386 | 2339 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2340 | } |
2341 | ||
2342 | /* | |
2343 | * Link filter bytecodes if not linked yet. | |
2344 | */ | |
a67ba386 MD |
2345 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2346 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2347 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2348 | |
2349 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2350 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2351 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2352 | &event_notifier_enabler->capture_bytecode_head); |
2353 | ||
a67ba386 | 2354 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2355 | } |
2356 | return 0; | |
2357 | } | |
2358 | ||
3c997079 MD |
2359 | /* |
2360 | * Called at module load: connect the probe on all enablers matching | |
2361 | * this event. | |
2362 | * Called with sessions lock held. | |
2363 | */ | |
2364 | int lttng_fix_pending_events(void) | |
2365 | { | |
2366 | struct lttng_session *session; | |
2367 | ||
2368 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2369 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2370 | return 0; |
2371 | } | |
2372 | ||
b01155ba FD |
2373 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2374 | struct lttng_event_notifier_group *event_notifier_group) | |
2375 | { | |
2376 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2377 | ||
2378 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2379 | node) { | |
2380 | if (event_notifier_enabler->base.enabled) | |
2381 | return true; | |
2382 | } | |
2383 | return false; | |
2384 | } | |
2385 | ||
2386 | bool lttng_event_notifier_active(void) | |
2387 | { | |
2388 | struct lttng_event_notifier_group *event_notifier_group; | |
2389 | ||
2390 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2391 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2392 | return true; | |
2393 | } | |
2394 | return false; | |
2395 | } | |
2396 | ||
2397 | int lttng_fix_pending_event_notifiers(void) | |
2398 | { | |
2399 | struct lttng_event_notifier_group *event_notifier_group; | |
2400 | ||
2401 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2402 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2403 | return 0; | |
2404 | } | |
2405 | ||
b2bc0bc8 FD |
2406 | struct lttng_event_enabler *lttng_event_enabler_create( |
2407 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2408 | struct lttng_kernel_abi_event *event_param, |
3c997079 MD |
2409 | struct lttng_channel *chan) |
2410 | { | |
b2bc0bc8 | 2411 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2412 | |
b2bc0bc8 FD |
2413 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2414 | if (!event_enabler) | |
3c997079 | 2415 | return NULL; |
b2bc0bc8 FD |
2416 | event_enabler->base.format_type = format_type; |
2417 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2418 | memcpy(&event_enabler->base.event_param, event_param, | |
2419 | sizeof(event_enabler->base.event_param)); | |
2420 | event_enabler->chan = chan; | |
3c997079 | 2421 | /* ctx left NULL */ |
b2bc0bc8 | 2422 | event_enabler->base.enabled = 0; |
3c997079 | 2423 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2424 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2425 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2426 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2427 | return event_enabler; |
3c997079 MD |
2428 | } |
2429 | ||
b2bc0bc8 | 2430 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2431 | { |
2432 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2433 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2434 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2435 | mutex_unlock(&sessions_mutex); |
2436 | return 0; | |
2437 | } | |
2438 | ||
b2bc0bc8 | 2439 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2440 | { |
2441 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2442 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2443 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2444 | mutex_unlock(&sessions_mutex); |
2445 | return 0; | |
2446 | } | |
2447 | ||
b2bc0bc8 | 2448 | static |
183e8b3a | 2449 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2450 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2451 | { |
d64ca521 | 2452 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2453 | uint32_t bytecode_len; |
2454 | int ret; | |
2455 | ||
2456 | ret = get_user(bytecode_len, &bytecode->len); | |
2457 | if (ret) | |
2458 | return ret; | |
52cfcdf3 | 2459 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2460 | GFP_KERNEL); |
2461 | if (!bytecode_node) | |
2462 | return -ENOMEM; | |
2463 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2464 | sizeof(*bytecode) + bytecode_len); | |
2465 | if (ret) | |
2466 | goto error_free; | |
b2bc0bc8 | 2467 | |
8a445457 | 2468 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2469 | bytecode_node->enabler = enabler; |
2470 | /* Enforce length based on allocated size */ | |
2471 | bytecode_node->bc.len = bytecode_len; | |
2472 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2473 | |
07dfc1d0 MD |
2474 | return 0; |
2475 | ||
2476 | error_free: | |
52cfcdf3 | 2477 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2478 | return ret; |
2479 | } | |
2480 | ||
183e8b3a | 2481 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2482 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2483 | { |
2484 | int ret; | |
183e8b3a | 2485 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2486 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2487 | if (ret) | |
2488 | goto error; | |
2489 | ||
2490 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2491 | return 0; | |
2492 | ||
2493 | error: | |
2494 | return ret; | |
2495 | } | |
2496 | ||
e2d5dbc7 | 2497 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2498 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2499 | { |
2500 | ||
e2d5dbc7 | 2501 | switch (event->priv->instrumentation) { |
606828e4 | 2502 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2503 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2504 | default: |
2505 | return -EINVAL; | |
2506 | } | |
2507 | } | |
2508 | ||
3c997079 MD |
2509 | static |
2510 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2511 | { | |
d64ca521 | 2512 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2513 | |
2514 | /* Destroy filter bytecode */ | |
2515 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2516 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2517 | lttng_kvfree(filter_node); |
07dfc1d0 | 2518 | } |
b2bc0bc8 FD |
2519 | } |
2520 | ||
2521 | static | |
2522 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2523 | { | |
2524 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2525 | |
b2bc0bc8 FD |
2526 | list_del(&event_enabler->node); |
2527 | kfree(event_enabler); | |
3c997079 MD |
2528 | } |
2529 | ||
dffef45d FD |
2530 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2531 | struct lttng_event_notifier_group *event_notifier_group, | |
2532 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2533 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2534 | { |
2535 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2536 | ||
2537 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2538 | if (!event_notifier_enabler) | |
2539 | return NULL; | |
2540 | ||
2541 | event_notifier_enabler->base.format_type = format_type; | |
2542 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2543 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2544 | ||
99f52fcc | 2545 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2546 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2547 | |
8a8ac9a8 FD |
2548 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2549 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2550 | |
2551 | event_notifier_enabler->base.enabled = 0; | |
2552 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2553 | event_notifier_enabler->group = event_notifier_group; | |
2554 | ||
2555 | mutex_lock(&sessions_mutex); | |
2556 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2557 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2558 | |
2559 | mutex_unlock(&sessions_mutex); | |
2560 | ||
2561 | return event_notifier_enabler; | |
2562 | } | |
2563 | ||
2564 | int lttng_event_notifier_enabler_enable( | |
2565 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2566 | { | |
2567 | mutex_lock(&sessions_mutex); | |
2568 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2569 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2570 | mutex_unlock(&sessions_mutex); |
2571 | return 0; | |
2572 | } | |
2573 | ||
2574 | int lttng_event_notifier_enabler_disable( | |
2575 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2576 | { | |
2577 | mutex_lock(&sessions_mutex); | |
2578 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2579 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2580 | mutex_unlock(&sessions_mutex); |
2581 | return 0; | |
2582 | } | |
2583 | ||
183e8b3a | 2584 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2585 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2586 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2587 | { |
2588 | int ret; | |
2589 | ||
183e8b3a | 2590 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2591 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2592 | bytecode); | |
2593 | if (ret) | |
2594 | goto error; | |
2595 | ||
b01155ba | 2596 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2597 | return 0; |
2598 | ||
2599 | error: | |
2600 | return ret; | |
2601 | } | |
2602 | ||
99d223ad FD |
2603 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2604 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2605 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2606 | { |
d64ca521 | 2607 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2608 | struct lttng_enabler *enabler = |
2609 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2610 | uint32_t bytecode_len; | |
2611 | int ret; | |
2612 | ||
2613 | ret = get_user(bytecode_len, &bytecode->len); | |
2614 | if (ret) | |
2615 | return ret; | |
2616 | ||
2617 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2618 | GFP_KERNEL); | |
2619 | if (!bytecode_node) | |
2620 | return -ENOMEM; | |
2621 | ||
2622 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2623 | sizeof(*bytecode) + bytecode_len); | |
2624 | if (ret) | |
2625 | goto error_free; | |
2626 | ||
8a445457 | 2627 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2628 | bytecode_node->enabler = enabler; |
2629 | ||
2630 | /* Enforce length based on allocated size */ | |
2631 | bytecode_node->bc.len = bytecode_len; | |
2632 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2633 | ||
2634 | event_notifier_enabler->num_captures++; | |
2635 | ||
2636 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2637 | goto end; | |
2638 | ||
2639 | error_free: | |
2640 | lttng_kvfree(bytecode_node); | |
2641 | end: | |
2642 | return ret; | |
2643 | } | |
2644 | ||
dffef45d FD |
2645 | static |
2646 | void lttng_event_notifier_enabler_destroy( | |
2647 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2648 | { | |
2649 | if (!event_notifier_enabler) { | |
2650 | return; | |
2651 | } | |
2652 | ||
2653 | list_del(&event_notifier_enabler->node); | |
2654 | ||
2655 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2656 | kfree(event_notifier_enabler); | |
2657 | } | |
2658 | ||
3c997079 | 2659 | /* |
b2bc0bc8 | 2660 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2661 | * session. |
2662 | * Should be called with sessions mutex held. | |
2663 | */ | |
2664 | static | |
b2bc0bc8 | 2665 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2666 | { |
b2bc0bc8 | 2667 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2668 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2669 | |
b2bc0bc8 FD |
2670 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2671 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2672 | /* |
2673 | * For each event, if at least one of its enablers is enabled, | |
2674 | * and its channel and session transient states are enabled, we | |
2675 | * enable the event, else we disable it. | |
2676 | */ | |
a67ba386 MD |
2677 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2678 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 | 2679 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2680 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2681 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2682 | int nr_filters = 0; | |
3c997079 | 2683 | |
a67ba386 | 2684 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2685 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2686 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2687 | /* Enable events */ |
2688 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2689 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2690 | if (enabler_ref->ref->enabled) { |
2691 | enabled = 1; | |
2692 | break; | |
2693 | } | |
2694 | } | |
4ecb5ad5 | 2695 | break; |
b4a75708 | 2696 | |
4ecb5ad5 | 2697 | default: |
3c997079 MD |
2698 | /* Not handled with lazy sync. */ |
2699 | continue; | |
2700 | } | |
2701 | /* | |
2702 | * Enabled state is based on union of enablers, with | |
2703 | * intesection of session and channel transient enable | |
2704 | * states. | |
2705 | */ | |
a67ba386 | 2706 | enabled = enabled && session->tstate && event_recorder->chan->tstate; |
3c997079 | 2707 | |
a67ba386 | 2708 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2709 | /* |
2710 | * Sync tracepoint registration with event enabled | |
2711 | * state. | |
2712 | */ | |
2713 | if (enabled) { | |
a67ba386 | 2714 | register_event(event_recorder); |
3c997079 | 2715 | } else { |
a67ba386 | 2716 | _lttng_event_unregister(event_recorder); |
3c997079 | 2717 | } |
07dfc1d0 MD |
2718 | |
2719 | /* Check if has enablers without bytecode enabled */ | |
2720 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2721 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2722 | if (enabler_ref->ref->enabled |
2723 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2724 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2725 | break; |
2726 | } | |
2727 | } | |
a67ba386 | 2728 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2729 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2730 | |
2731 | /* Enable filters */ | |
2732 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2733 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2734 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2735 | nr_filters++; |
2736 | } | |
2737 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2738 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2739 | } |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * Apply enablers to session events, adding events to session if need | |
2744 | * be. It is required after each modification applied to an active | |
2745 | * session, and right before session "start". | |
2746 | * "lazy" sync means we only sync if required. | |
2747 | * Should be called with sessions mutex held. | |
2748 | */ | |
2749 | static | |
b2bc0bc8 | 2750 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2751 | { |
2752 | /* We can skip if session is not active */ | |
2753 | if (!session->active) | |
2754 | return; | |
b2bc0bc8 | 2755 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2756 | } |
2757 | ||
b01155ba FD |
2758 | static |
2759 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2760 | { | |
2761 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2762 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2763 | |
2764 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2765 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2766 | ||
2767 | /* | |
2768 | * For each event_notifier, if at least one of its enablers is enabled, | |
2769 | * we enable the event_notifier, else we disable it. | |
2770 | */ | |
a67ba386 MD |
2771 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2772 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2773 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2774 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2775 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2776 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2777 | |
a67ba386 | 2778 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2779 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2780 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2781 | /* Enable event_notifiers */ |
2782 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2783 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2784 | if (enabler_ref->ref->enabled) { |
2785 | enabled = 1; | |
2786 | break; | |
2787 | } | |
2788 | } | |
2789 | break; | |
b4a75708 | 2790 | |
b01155ba FD |
2791 | default: |
2792 | /* Not handled with sync. */ | |
2793 | continue; | |
2794 | } | |
2795 | ||
a67ba386 | 2796 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2797 | /* |
2798 | * Sync tracepoint registration with event_notifier enabled | |
2799 | * state. | |
2800 | */ | |
2801 | if (enabled) { | |
a67ba386 | 2802 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2803 | register_event_notifier(event_notifier); |
2804 | } else { | |
a67ba386 | 2805 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2806 | _lttng_event_notifier_unregister(event_notifier); |
2807 | } | |
2808 | ||
2809 | /* Check if has enablers without bytecode enabled */ | |
2810 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2811 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2812 | if (enabler_ref->ref->enabled |
2813 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2814 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2815 | break; |
2816 | } | |
2817 | } | |
a67ba386 | 2818 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2819 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2820 | |
2821 | /* Enable filters */ | |
2822 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2823 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2824 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2825 | nr_filters++; |
2826 | } | |
2827 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2828 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2829 | |
2830 | /* Enable captures */ | |
2831 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2832 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2833 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2834 | nr_captures++; |
2835 | } | |
2836 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2837 | } |
2838 | } | |
2839 | ||
1ec3f75a | 2840 | /* |
d83004aa JD |
2841 | * Serialize at most one packet worth of metadata into a metadata |
2842 | * channel. | |
92d9f5e6 MD |
2843 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2844 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2845 | * allows us to do racy operations such as looking for remaining space left in | |
2846 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2847 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2848 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2849 | * Returns the number of bytes written in the channel, 0 if no data |
2850 | * was written and a negative value on error. | |
1ec3f75a | 2851 | */ |
b3b8072b | 2852 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2853 | struct channel *chan, bool *coherent) |
d83004aa JD |
2854 | { |
2855 | struct lib_ring_buffer_ctx ctx; | |
2856 | int ret = 0; | |
2857 | size_t len, reserve_len; | |
2858 | ||
f613e3e6 | 2859 | /* |
92d9f5e6 MD |
2860 | * Ensure we support mutiple get_next / put sequences followed by |
2861 | * put_next. The metadata cache lock protects reading the metadata | |
2862 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2863 | * "flush" operations on the buffer invoked by different processes. | |
2864 | * Moreover, since the metadata cache memory can be reallocated, we | |
2865 | * need to have exclusive access against updates even though we only | |
2866 | * read it. | |
f613e3e6 | 2867 | */ |
92d9f5e6 | 2868 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2869 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2870 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2871 | goto end; |
f613e3e6 | 2872 | |
9616f0bf JD |
2873 | /* Metadata regenerated, change the version. */ |
2874 | if (stream->metadata_cache->version != stream->version) | |
2875 | stream->version = stream->metadata_cache->version; | |
2876 | ||
d83004aa | 2877 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2878 | stream->metadata_in; |
9de2c215 | 2879 | if (!len) |
de23d59d | 2880 | goto end; |
d83004aa | 2881 | reserve_len = min_t(size_t, |
b3b8072b | 2882 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2883 | len); |
a775608d | 2884 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2885 | sizeof(char), NULL); |
d83004aa JD |
2886 | /* |
2887 | * If reservation failed, return an error to the caller. | |
2888 | */ | |
c2fb9c1c | 2889 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2890 | if (ret != 0) { |
2891 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2892 | stream->coherent = false; |
d83004aa JD |
2893 | goto end; |
2894 | } | |
b3b8072b | 2895 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2896 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2897 | reserve_len); |
b3b8072b | 2898 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2899 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2900 | if (reserve_len < len) |
8b97fd42 MD |
2901 | stream->coherent = false; |
2902 | else | |
2903 | stream->coherent = true; | |
d83004aa JD |
2904 | ret = reserve_len; |
2905 | ||
2906 | end: | |
8b97fd42 MD |
2907 | if (coherent) |
2908 | *coherent = stream->coherent; | |
92d9f5e6 | 2909 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2910 | return ret; |
2911 | } | |
2912 | ||
8b97fd42 MD |
2913 | static |
2914 | void lttng_metadata_begin(struct lttng_session *session) | |
2915 | { | |
3e75e2a7 MD |
2916 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2917 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2918 | } |
2919 | ||
2920 | static | |
2921 | void lttng_metadata_end(struct lttng_session *session) | |
2922 | { | |
3e75e2a7 MD |
2923 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2924 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2925 | struct lttng_metadata_stream *stream; | |
2926 | ||
3e75e2a7 MD |
2927 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2928 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2929 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2930 | } |
8b97fd42 MD |
2931 | } |
2932 | ||
d83004aa JD |
2933 | /* |
2934 | * Write the metadata to the metadata cache. | |
2935 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2936 | * The metadata cache lock protects us from concurrent read access from |
2937 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2938 | * The content of the printf is printed as a single atomic metadata |
2939 | * transaction. | |
d83004aa | 2940 | */ |
a90917c3 | 2941 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2942 | const char *fmt, ...) |
2943 | { | |
c099397a | 2944 | char *str; |
d83004aa | 2945 | size_t len; |
c099397a MD |
2946 | va_list ap; |
2947 | ||
585e5dcc | 2948 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2949 | |
2950 | va_start(ap, fmt); | |
2951 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2952 | va_end(ap); | |
2953 | if (!str) | |
2954 | return -ENOMEM; | |
2955 | ||
1ec3f75a | 2956 | len = strlen(str); |
3e75e2a7 | 2957 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2958 | if (session->metadata_cache->metadata_written + len > |
2959 | session->metadata_cache->cache_alloc) { | |
2960 | char *tmp_cache_realloc; | |
2961 | unsigned int tmp_cache_alloc_size; | |
2962 | ||
2963 | tmp_cache_alloc_size = max_t(unsigned int, | |
2964 | session->metadata_cache->cache_alloc + len, | |
2965 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2966 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2967 | if (!tmp_cache_realloc) |
2968 | goto err; | |
a606b6e8 ML |
2969 | if (session->metadata_cache->data) { |
2970 | memcpy(tmp_cache_realloc, | |
2971 | session->metadata_cache->data, | |
2972 | session->metadata_cache->cache_alloc); | |
2973 | vfree(session->metadata_cache->data); | |
2974 | } | |
2975 | ||
d83004aa JD |
2976 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2977 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2978 | } |
d83004aa JD |
2979 | memcpy(session->metadata_cache->data + |
2980 | session->metadata_cache->metadata_written, | |
2981 | str, len); | |
2982 | session->metadata_cache->metadata_written += len; | |
c099397a | 2983 | kfree(str); |
d83004aa | 2984 | |
d83004aa JD |
2985 | return 0; |
2986 | ||
2987 | err: | |
2988 | kfree(str); | |
2989 | return -ENOMEM; | |
c099397a MD |
2990 | } |
2991 | ||
f513b2bf MD |
2992 | static |
2993 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2994 | { | |
2995 | size_t i; | |
2996 | ||
2997 | for (i = 0; i < nesting; i++) { | |
2998 | int ret; | |
2999 | ||
3000 | ret = lttng_metadata_printf(session, " "); | |
3001 | if (ret) { | |
3002 | return ret; | |
3003 | } | |
3004 | } | |
3005 | return 0; | |
3006 | } | |
3007 | ||
ceabb767 MD |
3008 | static |
3009 | int lttng_field_name_statedump(struct lttng_session *session, | |
437d5aa5 | 3010 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3011 | size_t nesting) |
3012 | { | |
3013 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3014 | } | |
3015 | ||
3016 | static | |
3017 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3018 | const struct lttng_kernel_type_integer *type, |
3019 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3020 | size_t nesting) |
3021 | { | |
3022 | int ret; | |
3023 | ||
ceabb767 MD |
3024 | ret = print_tabs(session, nesting); |
3025 | if (ret) | |
3026 | return ret; | |
3027 | ret = lttng_metadata_printf(session, | |
3028 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3029 | type->size, |
3030 | type->alignment, | |
3031 | type->signedness, | |
3032 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3033 | ? "none" |
437d5aa5 | 3034 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3035 | ? "UTF8" |
3036 | : "ASCII", | |
437d5aa5 | 3037 | type->base, |
ceabb767 | 3038 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3039 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3040 | #else |
437d5aa5 | 3041 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3042 | #endif |
3043 | ); | |
3044 | return ret; | |
3045 | } | |
3046 | ||
f513b2bf MD |
3047 | /* |
3048 | * Must be called with sessions_mutex held. | |
3049 | */ | |
3050 | static | |
3051 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3052 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3053 | size_t nesting) |
3054 | { | |
51ef4536 | 3055 | const char *prev_field_name = NULL; |
f513b2bf MD |
3056 | int ret; |
3057 | uint32_t i, nr_fields; | |
ceabb767 MD |
3058 | unsigned int alignment; |
3059 | ||
f513b2bf MD |
3060 | ret = print_tabs(session, nesting); |
3061 | if (ret) | |
3062 | return ret; | |
3063 | ret = lttng_metadata_printf(session, | |
3064 | "struct {\n"); | |
3065 | if (ret) | |
3066 | return ret; | |
437d5aa5 | 3067 | nr_fields = type->nr_fields; |
f513b2bf | 3068 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3069 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3070 | |
437d5aa5 | 3071 | iter_field = type->fields[i]; |
51ef4536 | 3072 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3073 | if (ret) |
3074 | return ret; | |
3075 | } | |
3076 | ret = print_tabs(session, nesting); | |
3077 | if (ret) | |
3078 | return ret; | |
437d5aa5 | 3079 | alignment = type->alignment; |
ceabb767 MD |
3080 | if (alignment) { |
3081 | ret = lttng_metadata_printf(session, | |
3082 | "} align(%u)", | |
3083 | alignment); | |
3084 | } else { | |
3085 | ret = lttng_metadata_printf(session, | |
3086 | "}"); | |
3087 | } | |
f513b2bf MD |
3088 | return ret; |
3089 | } | |
3090 | ||
3091 | /* | |
3092 | * Must be called with sessions_mutex held. | |
3093 | */ | |
3094 | static | |
ceabb767 | 3095 | int _lttng_struct_field_statedump(struct lttng_session *session, |
437d5aa5 | 3096 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3097 | size_t nesting) |
3098 | { | |
3099 | int ret; | |
3100 | ||
3101 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3102 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3103 | if (ret) |
3104 | return ret; | |
ceabb767 | 3105 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3106 | } |
3107 | ||
65c85aa6 MD |
3108 | /* |
3109 | * Must be called with sessions_mutex held. | |
3110 | */ | |
3111 | static | |
3112 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3113 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3114 | size_t nesting, |
3115 | const char *prev_field_name) | |
65c85aa6 | 3116 | { |
51ef4536 | 3117 | const char *tag_name; |
65c85aa6 MD |
3118 | int ret; |
3119 | uint32_t i, nr_choices; | |
3120 | ||
51ef4536 MD |
3121 | tag_name = type->tag_name; |
3122 | if (!tag_name) | |
3123 | tag_name = prev_field_name; | |
3124 | if (!tag_name) | |
3125 | return -EINVAL; | |
ceabb767 MD |
3126 | /* |
3127 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3128 | */ | |
437d5aa5 | 3129 | if (type->alignment != 0) |
ceabb767 | 3130 | return -EINVAL; |
65c85aa6 MD |
3131 | ret = print_tabs(session, nesting); |
3132 | if (ret) | |
3133 | return ret; | |
3134 | ret = lttng_metadata_printf(session, | |
3135 | "variant <_%s> {\n", | |
51ef4536 | 3136 | tag_name); |
65c85aa6 MD |
3137 | if (ret) |
3138 | return ret; | |
437d5aa5 | 3139 | nr_choices = type->nr_choices; |
65c85aa6 | 3140 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3141 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3142 | |
437d5aa5 | 3143 | iter_field = type->choices[i]; |
51ef4536 | 3144 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3145 | if (ret) |
3146 | return ret; | |
3147 | } | |
3148 | ret = print_tabs(session, nesting); | |
3149 | if (ret) | |
3150 | return ret; | |
3151 | ret = lttng_metadata_printf(session, | |
3152 | "}"); | |
3153 | return ret; | |
3154 | } | |
3155 | ||
3156 | /* | |
3157 | * Must be called with sessions_mutex held. | |
3158 | */ | |
3159 | static | |
ceabb767 | 3160 | int _lttng_variant_field_statedump(struct lttng_session *session, |
437d5aa5 | 3161 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3162 | size_t nesting, |
3163 | const char *prev_field_name) | |
65c85aa6 MD |
3164 | { |
3165 | int ret; | |
3166 | ||
3167 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3168 | lttng_kernel_get_type_variant(field->type), nesting, |
3169 | prev_field_name); | |
65c85aa6 MD |
3170 | if (ret) |
3171 | return ret; | |
ceabb767 | 3172 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3173 | } |
3174 | ||
f513b2bf MD |
3175 | /* |
3176 | * Must be called with sessions_mutex held. | |
3177 | */ | |
3178 | static | |
ceabb767 | 3179 | int _lttng_array_field_statedump(struct lttng_session *session, |
437d5aa5 | 3180 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3181 | size_t nesting) |
3182 | { | |
3183 | int ret; | |
437d5aa5 MD |
3184 | const struct lttng_kernel_type_array *array_type; |
3185 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3186 | |
437d5aa5 MD |
3187 | array_type = lttng_kernel_get_type_array(field->type); |
3188 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3189 | |
437d5aa5 | 3190 | if (array_type->alignment) { |
ceabb767 | 3191 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3192 | if (ret) |
3193 | return ret; | |
ceabb767 MD |
3194 | ret = lttng_metadata_printf(session, |
3195 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3196 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3197 | field->name); |
3198 | if (ret) | |
3199 | return ret; | |
3200 | } | |
3201 | /* | |
3202 | * Nested compound types: Only array of structures and variants are | |
3203 | * currently supported. | |
3204 | */ | |
437d5aa5 | 3205 | elem_type = array_type->elem_type; |
12bb2edb MD |
3206 | switch (elem_type->type) { |
3207 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3208 | case lttng_kernel_type_struct: |
3209 | case lttng_kernel_type_variant: | |
3210 | ret = _lttng_type_statedump(session, elem_type, | |
3211 | array_type->encoding, nesting); | |
65c85aa6 MD |
3212 | if (ret) |
3213 | return ret; | |
3214 | break; | |
ceabb767 | 3215 | |
f513b2bf MD |
3216 | default: |
3217 | return -EINVAL; | |
3218 | } | |
3219 | ret = lttng_metadata_printf(session, | |
3220 | " _%s[%u];\n", | |
3221 | field->name, | |
437d5aa5 | 3222 | array_type->length); |
f513b2bf MD |
3223 | return ret; |
3224 | } | |
3225 | ||
3226 | /* | |
3227 | * Must be called with sessions_mutex held. | |
3228 | */ | |
3229 | static | |
ceabb767 | 3230 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
437d5aa5 | 3231 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3232 | size_t nesting, |
3233 | const char *prev_field_name) | |
f513b2bf MD |
3234 | { |
3235 | int ret; | |
3236 | const char *length_name; | |
437d5aa5 MD |
3237 | const struct lttng_kernel_type_sequence *sequence_type; |
3238 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3239 | |
437d5aa5 MD |
3240 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3241 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3242 | |
437d5aa5 | 3243 | length_name = sequence_type->length_name; |
51ef4536 MD |
3244 | if (!length_name) |
3245 | length_name = prev_field_name; | |
3246 | if (!length_name) | |
3247 | return -EINVAL; | |
ceabb767 | 3248 | |
437d5aa5 | 3249 | if (sequence_type->alignment) { |
ceabb767 | 3250 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3251 | if (ret) |
3252 | return ret; | |
ceabb767 MD |
3253 | ret = lttng_metadata_printf(session, |
3254 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3255 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3256 | field->name); |
3257 | if (ret) | |
3258 | return ret; | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * Nested compound types: Only array of structures and variants are | |
3263 | * currently supported. | |
3264 | */ | |
437d5aa5 | 3265 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3266 | switch (elem_type->type) { |
3267 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3268 | case lttng_kernel_type_struct: |
3269 | case lttng_kernel_type_variant: | |
3270 | ret = _lttng_type_statedump(session, elem_type, | |
3271 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3272 | if (ret) |
3273 | return ret; | |
3274 | break; | |
ceabb767 | 3275 | |
f513b2bf MD |
3276 | default: |
3277 | return -EINVAL; | |
3278 | } | |
3279 | ret = lttng_metadata_printf(session, | |
3280 | " _%s[ _%s ];\n", | |
3281 | field->name, | |
51ef4536 | 3282 | length_name); |
f513b2bf MD |
3283 | return ret; |
3284 | } | |
3285 | ||
141ddf28 MD |
3286 | /* |
3287 | * Must be called with sessions_mutex held. | |
3288 | */ | |
3289 | static | |
ceabb767 | 3290 | int _lttng_enum_type_statedump(struct lttng_session *session, |
437d5aa5 | 3291 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3292 | size_t nesting) |
3293 | { | |
d96a4a7a | 3294 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3295 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3296 | int ret; |
3297 | unsigned int i, nr_entries; | |
3298 | ||
437d5aa5 | 3299 | container_type = type->container_type; |
12bb2edb | 3300 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3301 | ret = -EINVAL; |
3302 | goto end; | |
3303 | } | |
437d5aa5 | 3304 | enum_desc = type->desc; |
141ddf28 MD |
3305 | nr_entries = enum_desc->nr_entries; |
3306 | ||
3307 | ret = print_tabs(session, nesting); | |
3308 | if (ret) | |
3309 | goto end; | |
ceabb767 MD |
3310 | ret = lttng_metadata_printf(session, "enum : "); |
3311 | if (ret) | |
3312 | goto end; | |
437d5aa5 MD |
3313 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3314 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3315 | if (ret) |
ceabb767 MD |
3316 | goto end; |
3317 | ret = lttng_metadata_printf(session, " {\n"); | |
3318 | if (ret) | |
3319 | goto end; | |
141ddf28 MD |
3320 | /* Dump all entries */ |
3321 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3322 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3323 | int j, len; |
3324 | ||
3325 | ret = print_tabs(session, nesting + 1); | |
3326 | if (ret) | |
3327 | goto end; | |
3328 | ret = lttng_metadata_printf(session, | |
3329 | "\""); | |
3330 | if (ret) | |
3331 | goto end; | |
3332 | len = strlen(entry->string); | |
3333 | /* Escape the character '"' */ | |
3334 | for (j = 0; j < len; j++) { | |
3335 | char c = entry->string[j]; | |
3336 | ||
3337 | switch (c) { | |
3338 | case '"': | |
3339 | ret = lttng_metadata_printf(session, | |
3340 | "\\\""); | |
3341 | break; | |
3342 | case '\\': | |
3343 | ret = lttng_metadata_printf(session, | |
3344 | "\\\\"); | |
3345 | break; | |
3346 | default: | |
3347 | ret = lttng_metadata_printf(session, | |
3348 | "%c", c); | |
3349 | break; | |
3350 | } | |
3351 | if (ret) | |
3352 | goto end; | |
3353 | } | |
08ad1061 PP |
3354 | ret = lttng_metadata_printf(session, "\""); |
3355 | if (ret) | |
3356 | goto end; | |
3357 | ||
3358 | if (entry->options.is_auto) { | |
3359 | ret = lttng_metadata_printf(session, ",\n"); | |
3360 | if (ret) | |
3361 | goto end; | |
141ddf28 | 3362 | } else { |
7c559490 MD |
3363 | ret = lttng_metadata_printf(session, |
3364 | " = "); | |
3365 | if (ret) | |
3366 | goto end; | |
3367 | if (entry->start.signedness) | |
141ddf28 | 3368 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3369 | "%lld", (long long) entry->start.value); |
3370 | else | |
3371 | ret = lttng_metadata_printf(session, | |
3372 | "%llu", entry->start.value); | |
3373 | if (ret) | |
3374 | goto end; | |
3375 | if (entry->start.signedness == entry->end.signedness && | |
3376 | entry->start.value | |
3377 | == entry->end.value) { | |
141ddf28 | 3378 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3379 | ",\n"); |
3380 | } else { | |
3381 | if (entry->end.signedness) { | |
3382 | ret = lttng_metadata_printf(session, | |
3383 | " ... %lld,\n", | |
3384 | (long long) entry->end.value); | |
3385 | } else { | |
3386 | ret = lttng_metadata_printf(session, | |
3387 | " ... %llu,\n", | |
3388 | entry->end.value); | |
3389 | } | |
141ddf28 | 3390 | } |
7c559490 MD |
3391 | if (ret) |
3392 | goto end; | |
141ddf28 | 3393 | } |
141ddf28 MD |
3394 | } |
3395 | ret = print_tabs(session, nesting); | |
3396 | if (ret) | |
3397 | goto end; | |
ceabb767 | 3398 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3399 | end: |
3400 | return ret; | |
3401 | } | |
3402 | ||
d83004aa JD |
3403 | /* |
3404 | * Must be called with sessions_mutex held. | |
3405 | */ | |
c099397a | 3406 | static |
ceabb767 | 3407 | int _lttng_enum_field_statedump(struct lttng_session *session, |
437d5aa5 | 3408 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3409 | size_t nesting) |
3410 | { | |
3411 | int ret; | |
437d5aa5 | 3412 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3413 | |
437d5aa5 MD |
3414 | enum_type = lttng_kernel_get_type_enum(field->type); |
3415 | WARN_ON_ONCE(!enum_type); | |
3416 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3417 | if (ret) |
3418 | return ret; | |
3419 | return lttng_field_name_statedump(session, field, nesting); | |
3420 | } | |
3421 | ||
3422 | static | |
3423 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3424 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3425 | size_t nesting) |
3426 | { | |
3427 | int ret; | |
3428 | ||
437d5aa5 MD |
3429 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3430 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3431 | if (ret) |
3432 | return ret; | |
3433 | return lttng_field_name_statedump(session, field, nesting); | |
3434 | } | |
3435 | ||
3436 | static | |
3437 | int _lttng_string_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3438 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3439 | size_t nesting) |
3440 | { | |
3441 | int ret; | |
3442 | ||
ceabb767 MD |
3443 | /* Default encoding is UTF8 */ |
3444 | ret = print_tabs(session, nesting); | |
3445 | if (ret) | |
3446 | return ret; | |
3447 | ret = lttng_metadata_printf(session, | |
3448 | "string%s", | |
437d5aa5 | 3449 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3450 | " { encoding = ASCII; }" : ""); |
3451 | return ret; | |
3452 | } | |
3453 | ||
3454 | static | |
3455 | int _lttng_string_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3456 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3457 | size_t nesting) |
ceabb767 | 3458 | { |
437d5aa5 | 3459 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3460 | int ret; |
3461 | ||
437d5aa5 MD |
3462 | string_type = lttng_kernel_get_type_string(field->type); |
3463 | WARN_ON_ONCE(!string_type); | |
3464 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3465 | if (ret) |
3466 | return ret; | |
3467 | return lttng_field_name_statedump(session, field, nesting); | |
3468 | } | |
3469 | ||
3470 | /* | |
3471 | * Must be called with sessions_mutex held. | |
3472 | */ | |
3473 | static | |
3474 | int _lttng_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3475 | const struct lttng_kernel_type_common *type, |
3476 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3477 | size_t nesting) |
c099397a | 3478 | { |
c099397a | 3479 | int ret = 0; |
c099397a | 3480 | |
12bb2edb MD |
3481 | switch (type->type) { |
3482 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3483 | ret = _lttng_integer_type_statedump(session, |
3484 | lttng_kernel_get_type_integer(type), | |
3485 | parent_encoding, nesting); | |
8070f5c0 | 3486 | break; |
437d5aa5 MD |
3487 | case lttng_kernel_type_enum: |
3488 | ret = _lttng_enum_type_statedump(session, | |
3489 | lttng_kernel_get_type_enum(type), | |
3490 | nesting); | |
8070f5c0 | 3491 | break; |
12bb2edb | 3492 | case lttng_kernel_type_string: |
437d5aa5 MD |
3493 | ret = _lttng_string_type_statedump(session, |
3494 | lttng_kernel_get_type_string(type), | |
3495 | nesting); | |
ceabb767 | 3496 | break; |
437d5aa5 MD |
3497 | case lttng_kernel_type_struct: |
3498 | ret = _lttng_struct_type_statedump(session, | |
3499 | lttng_kernel_get_type_struct(type), | |
3500 | nesting); | |
8070f5c0 | 3501 | break; |
437d5aa5 MD |
3502 | case lttng_kernel_type_variant: |
3503 | ret = _lttng_variant_type_statedump(session, | |
3504 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3505 | nesting, NULL); |
ceabb767 MD |
3506 | break; |
3507 | ||
3508 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3509 | case lttng_kernel_type_array: |
3510 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3511 | default: |
3512 | WARN_ON_ONCE(1); | |
3513 | return -EINVAL; | |
8070f5c0 | 3514 | } |
ceabb767 MD |
3515 | return ret; |
3516 | } | |
8070f5c0 | 3517 | |
ceabb767 MD |
3518 | /* |
3519 | * Must be called with sessions_mutex held. | |
3520 | */ | |
3521 | static | |
3522 | int _lttng_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3523 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3524 | size_t nesting, |
3525 | const char **prev_field_name_p) | |
ceabb767 | 3526 | { |
51ef4536 | 3527 | const char *prev_field_name = NULL; |
ceabb767 | 3528 | int ret = 0; |
27d2368e | 3529 | |
51ef4536 MD |
3530 | if (prev_field_name_p) |
3531 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3532 | switch (field->type->type) { |
12bb2edb | 3533 | case lttng_kernel_type_integer: |
ceabb767 MD |
3534 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3535 | break; | |
437d5aa5 | 3536 | case lttng_kernel_type_enum: |
ceabb767 | 3537 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3538 | break; |
12bb2edb | 3539 | case lttng_kernel_type_string: |
ceabb767 | 3540 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3541 | break; |
437d5aa5 | 3542 | case lttng_kernel_type_struct: |
ceabb767 | 3543 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3544 | break; |
437d5aa5 | 3545 | case lttng_kernel_type_array: |
ceabb767 | 3546 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3547 | break; |
437d5aa5 | 3548 | case lttng_kernel_type_sequence: |
51ef4536 | 3549 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3550 | break; |
437d5aa5 | 3551 | case lttng_kernel_type_variant: |
51ef4536 | 3552 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3553 | break; |
f513b2bf | 3554 | |
8070f5c0 MD |
3555 | default: |
3556 | WARN_ON_ONCE(1); | |
3557 | return -EINVAL; | |
3558 | } | |
51ef4536 MD |
3559 | if (prev_field_name_p) |
3560 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3561 | return ret; |
3562 | } | |
3563 | ||
3564 | static | |
a90917c3 | 3565 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
437d5aa5 | 3566 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3567 | { |
51ef4536 | 3568 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3569 | int ret = 0; |
3570 | int i; | |
3571 | ||
3572 | if (!ctx) | |
3573 | return 0; | |
3574 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3575 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3576 | |
51ef4536 | 3577 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3578 | if (ret) |
3579 | return ret; | |
3580 | } | |
3581 | return ret; | |
3582 | } | |
3583 | ||
3584 | static | |
a90917c3 | 3585 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
a67ba386 | 3586 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3587 | { |
51ef4536 | 3588 | const char *prev_field_name = NULL; |
a67ba386 | 3589 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3590 | int ret = 0; |
3591 | int i; | |
3592 | ||
3593 | for (i = 0; i < desc->nr_fields; i++) { | |
437d5aa5 | 3594 | const struct lttng_kernel_event_field *field = desc->fields[i]; |
8070f5c0 | 3595 | |
51ef4536 | 3596 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3597 | if (ret) |
3598 | return ret; | |
c099397a MD |
3599 | } |
3600 | return ret; | |
3601 | } | |
3602 | ||
d83004aa JD |
3603 | /* |
3604 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3605 | * The entire event metadata is printed as a single atomic metadata |
3606 | * transaction. | |
d83004aa | 3607 | */ |
c099397a | 3608 | static |
a90917c3 MD |
3609 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3610 | struct lttng_channel *chan, | |
a67ba386 | 3611 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3612 | { |
3613 | int ret = 0; | |
3614 | ||
a67ba386 | 3615 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3616 | return 0; |
d83004aa | 3617 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3618 | return 0; |
3619 | ||
8b97fd42 MD |
3620 | lttng_metadata_begin(session); |
3621 | ||
c099397a MD |
3622 | ret = lttng_metadata_printf(session, |
3623 | "event {\n" | |
ae734547 | 3624 | " name = \"%s\";\n" |
c099397a | 3625 | " id = %u;\n" |
b9074a1b | 3626 | " stream_id = %u;\n", |
a67ba386 MD |
3627 | event_recorder->priv->parent.desc->event_name, |
3628 | event_recorder->priv->id, | |
3629 | event_recorder->chan->id); | |
c099397a MD |
3630 | if (ret) |
3631 | goto end; | |
3632 | ||
8070f5c0 | 3633 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3634 | " fields := struct {\n" |
3635 | ); | |
3636 | if (ret) | |
3637 | goto end; | |
3638 | ||
a67ba386 | 3639 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3640 | if (ret) |
3641 | goto end; | |
3642 | ||
3643 | /* | |
3644 | * LTTng space reservation can only reserve multiples of the | |
3645 | * byte size. | |
3646 | */ | |
3647 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3648 | " };\n" |
3649 | "};\n\n"); | |
c099397a MD |
3650 | if (ret) |
3651 | goto end; | |
3652 | ||
a67ba386 | 3653 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3654 | end: |
8b97fd42 | 3655 | lttng_metadata_end(session); |
c099397a MD |
3656 | return ret; |
3657 | ||
3658 | } | |
3659 | ||
d83004aa JD |
3660 | /* |
3661 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3662 | * The entire channel metadata is printed as a single atomic metadata |
3663 | * transaction. | |
d83004aa | 3664 | */ |
c099397a | 3665 | static |
a90917c3 MD |
3666 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3667 | struct lttng_channel *chan) | |
c099397a MD |
3668 | { |
3669 | int ret = 0; | |
3670 | ||
585e5dcc | 3671 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3672 | return 0; |
d83004aa JD |
3673 | |
3674 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3675 | return 0; |
3676 | ||
8b97fd42 MD |
3677 | lttng_metadata_begin(session); |
3678 | ||
c099397a MD |
3679 | WARN_ON_ONCE(!chan->header_type); |
3680 | ret = lttng_metadata_printf(session, | |
3681 | "stream {\n" | |
3682 | " id = %u;\n" | |
9115fbdc | 3683 | " event.header := %s;\n" |
b9074a1b | 3684 | " packet.context := struct packet_context;\n", |
c099397a MD |
3685 | chan->id, |
3686 | chan->header_type == 1 ? "struct event_header_compact" : | |
3687 | "struct event_header_large"); | |
3688 | if (ret) | |
3689 | goto end; | |
3690 | ||
b9074a1b MD |
3691 | if (chan->ctx) { |
3692 | ret = lttng_metadata_printf(session, | |
3693 | " event.context := struct {\n"); | |
3694 | if (ret) | |
3695 | goto end; | |
3696 | } | |
a90917c3 | 3697 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3698 | if (ret) |
3699 | goto end; | |
b9074a1b MD |
3700 | if (chan->ctx) { |
3701 | ret = lttng_metadata_printf(session, | |
3702 | " };\n"); | |
3703 | if (ret) | |
3704 | goto end; | |
3705 | } | |
8070f5c0 MD |
3706 | |
3707 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3708 | "};\n\n"); |
8070f5c0 | 3709 | |
c099397a MD |
3710 | chan->metadata_dumped = 1; |
3711 | end: | |
8b97fd42 | 3712 | lttng_metadata_end(session); |
c099397a MD |
3713 | return ret; |
3714 | } | |
3715 | ||
d83004aa JD |
3716 | /* |
3717 | * Must be called with sessions_mutex held. | |
3718 | */ | |
9115fbdc | 3719 | static |
a90917c3 | 3720 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3721 | { |
3722 | return lttng_metadata_printf(session, | |
3723 | "struct packet_context {\n" | |
a3ccff4f MD |
3724 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3725 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3726 | " uint64_t content_size;\n" |
3727 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3728 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3729 | " unsigned long events_discarded;\n" |
9115fbdc | 3730 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3731 | "};\n\n" |
9115fbdc MD |
3732 | ); |
3733 | } | |
3734 | ||
3735 | /* | |
3736 | * Compact header: | |
3737 | * id: range: 0 - 30. | |
3738 | * id 31 is reserved to indicate an extended header. | |
3739 | * | |
3740 | * Large header: | |
3741 | * id: range: 0 - 65534. | |
3742 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3743 | * |
3744 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3745 | */ |
3746 | static | |
a90917c3 | 3747 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3748 | { |
3749 | return lttng_metadata_printf(session, | |
3750 | "struct event_header_compact {\n" | |
3751 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3752 | " variant <id> {\n" | |
3753 | " struct {\n" | |
a3ccff4f | 3754 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3755 | " } compact;\n" |
3756 | " struct {\n" | |
3757 | " uint32_t id;\n" | |
a3ccff4f | 3758 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3759 | " } extended;\n" |
3760 | " } v;\n" | |
3761 | "} align(%u);\n" | |
3762 | "\n" | |
3763 | "struct event_header_large {\n" | |
3764 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3765 | " variant <id> {\n" | |
3766 | " struct {\n" | |
a3ccff4f | 3767 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3768 | " } compact;\n" |
3769 | " struct {\n" | |
3770 | " uint32_t id;\n" | |
a3ccff4f | 3771 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3772 | " } extended;\n" |
3773 | " } v;\n" | |
3774 | "} align(%u);\n\n", | |
a90917c3 MD |
3775 | lttng_alignof(uint32_t) * CHAR_BIT, |
3776 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3777 | ); |
3778 | } | |
3779 | ||
a3ccff4f MD |
3780 | /* |
3781 | * Approximation of NTP time of day to clock monotonic correlation, | |
3782 | * taken at start of trace. | |
3783 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3784 | * in future versions. | |
5283350b MD |
3785 | * This function may return a negative offset. It may happen if the |
3786 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3787 | * |
3788 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3789 | * y2038 compliant. | |
a3ccff4f MD |
3790 | */ |
3791 | static | |
8967b2a3 | 3792 | int64_t measure_clock_offset(void) |
a3ccff4f | 3793 | { |
dcb93448 | 3794 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3795 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3796 | int64_t offset; |
a3ccff4f | 3797 | unsigned long flags; |
3636085f MJ |
3798 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3799 | struct timespec64 rts = { 0, 0 }; | |
3800 | #else | |
3801 | struct timespec rts = { 0, 0 }; | |
3802 | #endif | |
a3ccff4f MD |
3803 | |
3804 | /* Disable interrupts to increase correlation precision. */ | |
3805 | local_irq_save(flags); | |
3806 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3807 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3808 | ktime_get_real_ts64(&rts); | |
3809 | #else | |
216b6baa | 3810 | getnstimeofday(&rts); |
3636085f | 3811 | #endif |
a3ccff4f MD |
3812 | monotonic[1] = trace_clock_read64(); |
3813 | local_irq_restore(flags); | |
3814 | ||
dcb93448 | 3815 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3816 | realtime = (uint64_t) rts.tv_sec * tcf; |
3817 | if (tcf == NSEC_PER_SEC) { | |
3818 | realtime += rts.tv_nsec; | |
3819 | } else { | |
3820 | uint64_t n = rts.tv_nsec * tcf; | |
3821 | ||
3822 | do_div(n, NSEC_PER_SEC); | |
3823 | realtime += n; | |
3824 | } | |
dcb93448 | 3825 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3826 | return offset; |
3827 | } | |
3828 | ||
3eb95be4 JR |
3829 | static |
3830 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3831 | { | |
0f3eaad4 | 3832 | int ret = 0; |
3eb95be4 JR |
3833 | size_t i; |
3834 | char cur; | |
3835 | ||
3836 | i = 0; | |
3837 | cur = string[i]; | |
3838 | while (cur != '\0') { | |
3839 | switch (cur) { | |
3840 | case '\n': | |
3841 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3842 | break; | |
3843 | case '\\': | |
3844 | case '"': | |
3845 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3846 | if (ret) | |
3847 | goto error; | |
3848 | /* We still print the current char */ | |
3849 | /* Fallthrough */ | |
3850 | default: | |
3851 | ret = lttng_metadata_printf(session, "%c", cur); | |
3852 | break; | |
3853 | } | |
3854 | ||
3855 | if (ret) | |
3856 | goto error; | |
3857 | ||
3858 | cur = string[++i]; | |
3859 | } | |
3860 | error: | |
3861 | return ret; | |
3862 | } | |
3863 | ||
3864 | static | |
1c88f269 JR |
3865 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3866 | const char *field_value) | |
3eb95be4 JR |
3867 | { |
3868 | int ret; | |
3869 | ||
1c88f269 | 3870 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3871 | if (ret) |
3872 | goto error; | |
3873 | ||
1c88f269 | 3874 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3875 | if (ret) |
3876 | goto error; | |
3877 | ||
3878 | ret = lttng_metadata_printf(session, "\";\n"); | |
3879 | ||
3880 | error: | |
3881 | return ret; | |
3882 | } | |
3883 | ||
c099397a MD |
3884 | /* |
3885 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3886 | * Must be called with sessions_mutex held. |
c099397a MD |
3887 | */ |
3888 | static | |
a90917c3 | 3889 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3890 | { |
30bdb6e4 | 3891 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3892 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3893 | const char *product_uuid; |
a90917c3 | 3894 | struct lttng_channel *chan; |
a67ba386 | 3895 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3896 | int ret = 0; |
3897 | ||
585e5dcc | 3898 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3899 | return 0; |
8b97fd42 MD |
3900 | |
3901 | lttng_metadata_begin(session); | |
3902 | ||
c099397a MD |
3903 | if (session->metadata_dumped) |
3904 | goto skip_session; | |
c099397a | 3905 | |
d793d5e1 | 3906 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3907 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3908 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3909 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3910 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3911 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3912 | |
3913 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3914 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3915 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3916 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3917 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3918 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3919 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3920 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3921 | "\n" |
3922 | "trace {\n" | |
3923 | " major = %u;\n" | |
3924 | " minor = %u;\n" | |
30bdb6e4 | 3925 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3926 | " byte_order = %s;\n" |
3927 | " packet.header := struct {\n" | |
3928 | " uint32_t magic;\n" | |
1ec3f75a | 3929 | " uint8_t uuid[16];\n" |
d793d5e1 | 3930 | " uint32_t stream_id;\n" |
5594698f | 3931 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3932 | " };\n" |
d793d5e1 | 3933 | "};\n\n", |
a90917c3 MD |
3934 | lttng_alignof(uint8_t) * CHAR_BIT, |
3935 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3936 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3937 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3938 | sizeof(unsigned long) * CHAR_BIT, |
3939 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3940 | CTF_SPEC_MAJOR, |
3941 | CTF_SPEC_MINOR, | |
d793d5e1 | 3942 | uuid_s, |
5214fa50 | 3943 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3944 | "be" |
3945 | #else | |
3946 | "le" | |
3947 | #endif | |
3948 | ); | |
3949 | if (ret) | |
3950 | goto end; | |
3951 | ||
99dc9597 MD |
3952 | ret = lttng_metadata_printf(session, |
3953 | "env {\n" | |
a6058143 | 3954 | " hostname = \"%s\";\n" |
c6c9e10f | 3955 | " domain = \"kernel\";\n" |
99dc9597 | 3956 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3957 | " kernel_release = \"%s\";\n" |
3958 | " kernel_version = \"%s\";\n" | |
3959 | " tracer_name = \"lttng-modules\";\n" | |
3960 | " tracer_major = %d;\n" | |
3961 | " tracer_minor = %d;\n" | |
3962 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3963 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3964 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3965 | utsname()->sysname, |
3966 | utsname()->release, | |
c6c9e10f MD |
3967 | utsname()->version, |
3968 | LTTNG_MODULES_MAJOR_VERSION, | |
3969 | LTTNG_MODULES_MINOR_VERSION, | |
3970 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3971 | ); |
3972 | if (ret) | |
3973 | goto end; | |
3974 | ||
1c88f269 JR |
3975 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3976 | if (ret) | |
3977 | goto end; | |
3978 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3979 | session->creation_time); | |
3eb95be4 JR |
3980 | if (ret) |
3981 | goto end; | |
3982 | ||
c88f762e GB |
3983 | /* Add the product UUID to the 'env' section */ |
3984 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3985 | if (product_uuid) { | |
3986 | ret = lttng_metadata_printf(session, | |
3987 | " product_uuid = \"%s\";\n", | |
3988 | product_uuid | |
3989 | ); | |
3990 | if (ret) | |
3991 | goto end; | |
3992 | } | |
3993 | ||
3994 | /* Close the 'env' section */ | |
3eb95be4 JR |
3995 | ret = lttng_metadata_printf(session, "};\n\n"); |
3996 | if (ret) | |
3997 | goto end; | |
3998 | ||
a3ccff4f MD |
3999 | ret = lttng_metadata_printf(session, |
4000 | "clock {\n" | |
2754583e MD |
4001 | " name = \"%s\";\n", |
4002 | trace_clock_name() | |
a82c63f1 MD |
4003 | ); |
4004 | if (ret) | |
4005 | goto end; | |
4006 | ||
4007 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4008 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4009 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4010 | clock_uuid_s |
4011 | ); | |
4012 | if (ret) | |
4013 | goto end; | |
4014 | } | |
4015 | ||
4016 | ret = lttng_metadata_printf(session, | |
2754583e | 4017 | " description = \"%s\";\n" |
a3ccff4f MD |
4018 | " freq = %llu; /* Frequency, in Hz */\n" |
4019 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4020 | " offset = %lld;\n" |
a3ccff4f | 4021 | "};\n\n", |
2754583e | 4022 | trace_clock_description(), |
a3ccff4f | 4023 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4024 | (long long) measure_clock_offset() |
a3ccff4f MD |
4025 | ); |
4026 | if (ret) | |
4027 | goto end; | |
4028 | ||
4029 | ret = lttng_metadata_printf(session, | |
4030 | "typealias integer {\n" | |
4031 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4032 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4033 | "} := uint27_clock_monotonic_t;\n" |
4034 | "\n" | |
4035 | "typealias integer {\n" | |
4036 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4037 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4038 | "} := uint32_clock_monotonic_t;\n" |
4039 | "\n" | |
4040 | "typealias integer {\n" | |
4041 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4042 | " map = clock.%s.value;\n" |
a3ccff4f | 4043 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4044 | trace_clock_name(), |
a3ccff4f | 4045 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4046 | trace_clock_name(), |
4047 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4048 | trace_clock_name() | |
a3ccff4f MD |
4049 | ); |
4050 | if (ret) | |
4051 | goto end; | |
4052 | ||
a90917c3 | 4053 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4054 | if (ret) |
4055 | goto end; | |
4056 | ||
a90917c3 | 4057 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4058 | if (ret) |
4059 | goto end; | |
4060 | ||
c099397a MD |
4061 | skip_session: |
4062 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4063 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4064 | if (ret) |
4065 | goto end; | |
4066 | } | |
4067 | ||
a67ba386 MD |
4068 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
4069 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, | |
4070 | event_recorder_priv->pub); | |
c099397a MD |
4071 | if (ret) |
4072 | goto end; | |
4073 | } | |
4074 | session->metadata_dumped = 1; | |
4075 | end: | |
8b97fd42 | 4076 | lttng_metadata_end(session); |
c099397a MD |
4077 | return ret; |
4078 | } | |
4079 | ||
c0e31d2e | 4080 | /** |
a90917c3 | 4081 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4082 | * @transport: transport structure |
4083 | * | |
4084 | * Registers a transport which can be used as output to extract the data out of | |
4085 | * LTTng. The module calling this registration function must ensure that no | |
4086 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4087 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4088 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4089 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4090 | * after its registration must it synchronize the TLBs. |
4091 | */ | |
a90917c3 | 4092 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4093 | { |
4094 | /* | |
4095 | * Make sure no page fault can be triggered by the module about to be | |
4096 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4097 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4098 | */ |
263b6c88 | 4099 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4100 | |
4101 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4102 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4103 | mutex_unlock(&sessions_mutex); |
4104 | } | |
a90917c3 | 4105 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4106 | |
4107 | /** | |
a90917c3 | 4108 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4109 | * @transport: transport structure |
4110 | */ | |
a90917c3 | 4111 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4112 | { |
4113 | mutex_lock(&sessions_mutex); | |
4114 | list_del(&transport->node); | |
4115 | mutex_unlock(&sessions_mutex); | |
4116 | } | |
a90917c3 | 4117 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4118 | |
a101fa10 MD |
4119 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4120 | { | |
4121 | /* | |
4122 | * Make sure no page fault can be triggered by the module about to be | |
4123 | * registered. We deal with this here so we don't have to call | |
4124 | * vmalloc_sync_mappings() in each module's init. | |
4125 | */ | |
4126 | wrapper_vmalloc_sync_mappings(); | |
4127 | ||
4128 | mutex_lock(&sessions_mutex); | |
4129 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4130 | mutex_unlock(&sessions_mutex); | |
4131 | } | |
4132 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4133 | ||
4134 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4135 | { | |
4136 | mutex_lock(&sessions_mutex); | |
4137 | list_del(&transport->node); | |
4138 | mutex_unlock(&sessions_mutex); | |
4139 | } | |
4140 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4141 | ||
5f4c791e | 4142 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4143 | |
4144 | enum cpuhp_state lttng_hp_prepare; | |
4145 | enum cpuhp_state lttng_hp_online; | |
4146 | ||
4147 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4148 | { | |
4149 | struct lttng_cpuhp_node *lttng_node; | |
4150 | ||
4151 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4152 | switch (lttng_node->component) { | |
4153 | case LTTNG_RING_BUFFER_FRONTEND: | |
4154 | return 0; | |
4155 | case LTTNG_RING_BUFFER_BACKEND: | |
4156 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4157 | case LTTNG_RING_BUFFER_ITER: | |
4158 | return 0; | |
4159 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4160 | return 0; | |
4161 | default: | |
4162 | return -EINVAL; | |
4163 | } | |
4164 | } | |
4165 | ||
4166 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4167 | { | |
4168 | struct lttng_cpuhp_node *lttng_node; | |
4169 | ||
4170 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4171 | switch (lttng_node->component) { | |
4172 | case LTTNG_RING_BUFFER_FRONTEND: | |
4173 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4174 | case LTTNG_RING_BUFFER_BACKEND: | |
4175 | return 0; | |
4176 | case LTTNG_RING_BUFFER_ITER: | |
4177 | return 0; | |
4178 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4179 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4180 | default: | |
4181 | return -EINVAL; | |
4182 | } | |
4183 | } | |
4184 | ||
4185 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4186 | { | |
4187 | struct lttng_cpuhp_node *lttng_node; | |
4188 | ||
4189 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4190 | switch (lttng_node->component) { | |
4191 | case LTTNG_RING_BUFFER_FRONTEND: | |
4192 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4193 | case LTTNG_RING_BUFFER_BACKEND: | |
4194 | return 0; | |
4195 | case LTTNG_RING_BUFFER_ITER: | |
4196 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4197 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4198 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4199 | default: | |
4200 | return -EINVAL; | |
4201 | } | |
4202 | } | |
4203 | ||
4204 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4205 | { | |
4206 | struct lttng_cpuhp_node *lttng_node; | |
4207 | ||
4208 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4209 | switch (lttng_node->component) { | |
4210 | case LTTNG_RING_BUFFER_FRONTEND: | |
4211 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4212 | case LTTNG_RING_BUFFER_BACKEND: | |
4213 | return 0; | |
4214 | case LTTNG_RING_BUFFER_ITER: | |
4215 | return 0; | |
4216 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4217 | return 0; | |
4218 | default: | |
4219 | return -EINVAL; | |
4220 | } | |
4221 | } | |
4222 | ||
4223 | static int __init lttng_init_cpu_hotplug(void) | |
4224 | { | |
4225 | int ret; | |
4226 | ||
4227 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4228 | lttng_hotplug_prepare, | |
4229 | lttng_hotplug_dead); | |
4230 | if (ret < 0) { | |
4231 | return ret; | |
4232 | } | |
4233 | lttng_hp_prepare = ret; | |
4234 | lttng_rb_set_hp_prepare(ret); | |
4235 | ||
4236 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4237 | lttng_hotplug_online, | |
4238 | lttng_hotplug_offline); | |
4239 | if (ret < 0) { | |
4240 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4241 | lttng_hp_prepare = 0; | |
4242 | return ret; | |
4243 | } | |
4244 | lttng_hp_online = ret; | |
4245 | lttng_rb_set_hp_online(ret); | |
4246 | ||
4247 | return 0; | |
4248 | } | |
4249 | ||
4250 | static void __exit lttng_exit_cpu_hotplug(void) | |
4251 | { | |
4252 | lttng_rb_set_hp_online(0); | |
4253 | cpuhp_remove_multi_state(lttng_hp_online); | |
4254 | lttng_rb_set_hp_prepare(0); | |
4255 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4256 | } | |
4257 | ||
5f4c791e | 4258 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4259 | static int lttng_init_cpu_hotplug(void) |
4260 | { | |
4261 | return 0; | |
4262 | } | |
4263 | static void lttng_exit_cpu_hotplug(void) | |
4264 | { | |
4265 | } | |
5f4c791e | 4266 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4267 | |
4268 | ||
a90917c3 | 4269 | static int __init lttng_events_init(void) |
4e3c1b9b | 4270 | { |
1c25284c MD |
4271 | int ret; |
4272 | ||
453b2495 JD |
4273 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4274 | if (ret) | |
4275 | return ret; | |
389d7070 | 4276 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4277 | if (ret) |
4278 | return ret; | |
4279 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4280 | if (ret) |
4281 | return ret; | |
4282 | ret = lttng_probes_init(); | |
389d7070 MD |
4283 | if (ret) |
4284 | return ret; | |
07dfc1d0 | 4285 | ret = lttng_context_init(); |
20591cf7 MD |
4286 | if (ret) |
4287 | return ret; | |
07dfc1d0 MD |
4288 | ret = lttng_tracepoint_init(); |
4289 | if (ret) | |
4290 | goto error_tp; | |
a67ba386 MD |
4291 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4292 | if (!event_recorder_cache) { | |
20591cf7 | 4293 | ret = -ENOMEM; |
a67ba386 | 4294 | goto error_kmem_event_recorder; |
dffef45d | 4295 | } |
a67ba386 MD |
4296 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4297 | if (!event_recorder_private_cache) { | |
4298 | ret = -ENOMEM; | |
4299 | goto error_kmem_event_recorder_private; | |
4300 | } | |
4301 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4302 | if (!event_notifier_cache) { |
4303 | ret = -ENOMEM; | |
4304 | goto error_kmem_event_notifier; | |
20591cf7 | 4305 | } |
a67ba386 MD |
4306 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4307 | if (!event_notifier_private_cache) { | |
4308 | ret = -ENOMEM; | |
4309 | goto error_kmem_event_notifier_private; | |
4310 | } | |
80996790 | 4311 | ret = lttng_abi_init(); |
02119ee5 MD |
4312 | if (ret) |
4313 | goto error_abi; | |
0c956676 MD |
4314 | ret = lttng_logger_init(); |
4315 | if (ret) | |
4316 | goto error_logger; | |
1e367326 MD |
4317 | ret = lttng_init_cpu_hotplug(); |
4318 | if (ret) | |
4319 | goto error_hotplug; | |
101215b7 | 4320 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4321 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4322 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4323 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4324 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4325 | LTTNG_VERSION_NAME, |
4326 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4327 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4328 | #else | |
4329 | "", | |
4330 | #endif | |
4331 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4332 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4333 | #else | |
4334 | ""); | |
4335 | #endif | |
4e3c1b9b | 4336 | return 0; |
0c956676 | 4337 | |
1e367326 MD |
4338 | error_hotplug: |
4339 | lttng_logger_exit(); | |
0c956676 MD |
4340 | error_logger: |
4341 | lttng_abi_exit(); | |
02119ee5 | 4342 | error_abi: |
a67ba386 MD |
4343 | kmem_cache_destroy(event_notifier_private_cache); |
4344 | error_kmem_event_notifier_private: | |
dffef45d FD |
4345 | kmem_cache_destroy(event_notifier_cache); |
4346 | error_kmem_event_notifier: | |
a67ba386 MD |
4347 | kmem_cache_destroy(event_recorder_private_cache); |
4348 | error_kmem_event_recorder_private: | |
4349 | kmem_cache_destroy(event_recorder_cache); | |
4350 | error_kmem_event_recorder: | |
20591cf7 | 4351 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4352 | error_tp: |
4353 | lttng_context_exit(); | |
101215b7 | 4354 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4355 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4356 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4357 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4358 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4359 | LTTNG_VERSION_NAME, |
4360 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4361 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4362 | #else | |
4363 | "", | |
4364 | #endif | |
4365 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4366 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4367 | #else | |
4368 | ""); | |
4369 | #endif | |
1c25284c | 4370 | return ret; |
4e3c1b9b MD |
4371 | } |
4372 | ||
a90917c3 | 4373 | module_init(lttng_events_init); |
11b5a3c2 | 4374 | |
a90917c3 | 4375 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4376 | { |
a90917c3 | 4377 | struct lttng_session *session, *tmpsession; |
92e94819 | 4378 | |
1e367326 | 4379 | lttng_exit_cpu_hotplug(); |
0c956676 | 4380 | lttng_logger_exit(); |
80996790 | 4381 | lttng_abi_exit(); |
92e94819 | 4382 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4383 | lttng_session_destroy(session); |
a67ba386 MD |
4384 | kmem_cache_destroy(event_recorder_cache); |
4385 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4386 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4387 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4388 | lttng_tracepoint_exit(); |
07dfc1d0 | 4389 | lttng_context_exit(); |
101215b7 | 4390 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4391 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4392 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4393 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4394 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4395 | LTTNG_VERSION_NAME, |
4396 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4397 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4398 | #else | |
4399 | "", | |
4400 | #endif | |
4401 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4402 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4403 | #else | |
4404 | ""); | |
4405 | #endif | |
4e3c1b9b | 4406 | } |
92e94819 | 4407 | |
a90917c3 | 4408 | module_exit(lttng_events_exit); |
11b5a3c2 | 4409 | |
7ca11e77 | 4410 | #include <generated/patches.h> |
101215b7 MJ |
4411 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4412 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4413 | #endif | |
4414 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4415 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4416 | #endif | |
92e94819 MD |
4417 | MODULE_LICENSE("GPL and additional rights"); |
4418 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4419 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4420 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4421 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4422 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4423 | LTTNG_MODULES_EXTRAVERSION); |