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 | |
a67ba386 MD |
72 | static void _lttng_event_destroy(struct lttng_kernel_event_recorder *event); |
73 | static void _lttng_event_notifier_destroy(struct lttng_kernel_event_notifier *event_notifier); | |
a90917c3 | 74 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
a67ba386 MD |
75 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
76 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 77 | static |
a90917c3 MD |
78 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
79 | struct lttng_channel *chan, | |
a67ba386 | 80 | struct lttng_kernel_event_recorder *event); |
c099397a | 81 | static |
a90917c3 | 82 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
83 | static |
84 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 85 | static |
ceabb767 | 86 | int _lttng_type_statedump(struct lttng_session *session, |
437d5aa5 MD |
87 | const struct lttng_kernel_type_common *type, |
88 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
89 | size_t nesting); |
90 | static | |
f513b2bf | 91 | int _lttng_field_statedump(struct lttng_session *session, |
437d5aa5 | 92 | const struct lttng_kernel_event_field *field, |
f513b2bf | 93 | size_t nesting); |
c099397a | 94 | |
c099397a | 95 | void synchronize_trace(void) |
abcca994 | 96 | { |
5f4c791e | 97 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
98 | synchronize_rcu(); |
99 | #else | |
abcca994 | 100 | synchronize_sched(); |
92da05ce MJ |
101 | #endif |
102 | ||
5f4c791e | 103 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
104 | #ifdef CONFIG_PREEMPT_RT_FULL |
105 | synchronize_rcu(); | |
106 | #endif | |
5f4c791e | 107 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | #ifdef CONFIG_PREEMPT_RT |
109 | synchronize_rcu(); | |
110 | #endif | |
5f4c791e | 111 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
112 | } |
113 | ||
3c997079 MD |
114 | void lttng_lock_sessions(void) |
115 | { | |
116 | mutex_lock(&sessions_mutex); | |
117 | } | |
118 | ||
119 | void lttng_unlock_sessions(void) | |
120 | { | |
121 | mutex_unlock(&sessions_mutex); | |
122 | } | |
123 | ||
9fe593d2 FD |
124 | static struct lttng_transport *lttng_transport_find(const char *name) |
125 | { | |
126 | struct lttng_transport *transport; | |
127 | ||
128 | list_for_each_entry(transport, <tng_transport_list, node) { | |
129 | if (!strcmp(transport->name, name)) | |
130 | return transport; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
3c997079 MD |
135 | /* |
136 | * Called with sessions lock held. | |
137 | */ | |
138 | int lttng_session_active(void) | |
139 | { | |
140 | struct lttng_session *iter; | |
141 | ||
142 | list_for_each_entry(iter, &sessions, list) { | |
143 | if (iter->active) | |
144 | return 1; | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
a90917c3 | 149 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 150 | { |
a90917c3 | 151 | struct lttng_session *session; |
d83004aa | 152 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 153 | int i; |
4e3c1b9b MD |
154 | |
155 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 156 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 157 | if (!session) |
d83004aa | 158 | goto err; |
4e3c1b9b | 159 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 160 | INIT_LIST_HEAD(&session->events); |
a7008254 | 161 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
162 | |
163 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
164 | GFP_KERNEL); | |
165 | if (!metadata_cache) | |
166 | goto err_free_session; | |
0ca42eb7 | 167 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
168 | if (!metadata_cache->data) |
169 | goto err_free_cache; | |
170 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
171 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 172 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
173 | session->metadata_cache = metadata_cache; |
174 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
175 | memcpy(&metadata_cache->uuid, &session->uuid, |
176 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
177 | INIT_LIST_HEAD(&session->enablers_head); |
178 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
179 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 180 | list_add(&session->list, &sessions); |
d1f652f8 MD |
181 | session->pid_tracker.session = session; |
182 | session->pid_tracker.tracker_type = TRACKER_PID; | |
183 | session->vpid_tracker.session = session; | |
184 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
185 | session->uid_tracker.session = session; | |
186 | session->uid_tracker.tracker_type = TRACKER_UID; | |
187 | session->vuid_tracker.session = session; | |
188 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
189 | session->gid_tracker.session = session; | |
190 | session->gid_tracker.tracker_type = TRACKER_GID; | |
191 | session->vgid_tracker.session = session; | |
192 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
193 | mutex_unlock(&sessions_mutex); |
194 | return session; | |
d83004aa JD |
195 | |
196 | err_free_cache: | |
197 | kfree(metadata_cache); | |
198 | err_free_session: | |
48f5e0b5 | 199 | lttng_kvfree(session); |
d83004aa JD |
200 | err: |
201 | mutex_unlock(&sessions_mutex); | |
202 | return NULL; | |
203 | } | |
204 | ||
99f52fcc FD |
205 | static |
206 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
207 | { | |
208 | struct lttng_counter_transport *transport; | |
209 | ||
210 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
211 | if (!strcmp(transport->name, name)) | |
212 | return transport; | |
213 | } | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | struct lttng_counter *lttng_kernel_counter_create( | |
218 | const char *counter_transport_name, | |
219 | size_t number_dimensions, const size_t *dimensions_sizes) | |
220 | { | |
221 | struct lttng_counter *counter = NULL; | |
222 | struct lttng_counter_transport *counter_transport = NULL; | |
223 | ||
224 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
225 | if (!counter_transport) { | |
226 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
227 | counter_transport_name); | |
228 | goto notransport; | |
229 | } | |
230 | if (!try_module_get(counter_transport->owner)) { | |
231 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
232 | goto notransport; | |
233 | } | |
234 | ||
235 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
236 | if (!counter) | |
237 | goto nomem; | |
238 | ||
239 | /* Create event notifier error counter. */ | |
240 | counter->ops = &counter_transport->ops; | |
241 | counter->transport = counter_transport; | |
242 | ||
243 | counter->counter = counter->ops->counter_create( | |
244 | number_dimensions, dimensions_sizes, 0); | |
245 | if (!counter->counter) { | |
246 | goto create_error; | |
247 | } | |
248 | ||
249 | return counter; | |
250 | ||
251 | create_error: | |
252 | lttng_kvfree(counter); | |
253 | nomem: | |
254 | if (counter_transport) | |
255 | module_put(counter_transport->owner); | |
256 | notransport: | |
257 | return NULL; | |
258 | } | |
259 | ||
750b05f2 FD |
260 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
261 | { | |
262 | struct lttng_transport *transport = NULL; | |
263 | struct lttng_event_notifier_group *event_notifier_group; | |
264 | const char *transport_name = "relay-event-notifier"; | |
265 | size_t subbuf_size = 4096; //TODO | |
266 | size_t num_subbuf = 16; //TODO | |
267 | unsigned int switch_timer_interval = 0; | |
268 | unsigned int read_timer_interval = 0; | |
dffef45d | 269 | int i; |
750b05f2 FD |
270 | |
271 | mutex_lock(&sessions_mutex); | |
272 | ||
273 | transport = lttng_transport_find(transport_name); | |
274 | if (!transport) { | |
275 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
276 | transport_name); | |
277 | goto notransport; | |
278 | } | |
279 | if (!try_module_get(transport->owner)) { | |
280 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
281 | transport_name); | |
282 | goto notransport; | |
283 | } | |
284 | ||
285 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
286 | GFP_KERNEL); | |
287 | if (!event_notifier_group) | |
288 | goto nomem; | |
289 | ||
290 | /* | |
291 | * Initialize the ring buffer used to store event notifier | |
292 | * notifications. | |
293 | */ | |
294 | event_notifier_group->ops = &transport->ops; | |
295 | event_notifier_group->chan = transport->ops.channel_create( | |
296 | transport_name, event_notifier_group, NULL, | |
297 | subbuf_size, num_subbuf, switch_timer_interval, | |
298 | read_timer_interval); | |
299 | if (!event_notifier_group->chan) | |
300 | goto create_error; | |
301 | ||
302 | event_notifier_group->transport = transport; | |
dffef45d FD |
303 | |
304 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
305 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
306 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
307 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
308 | ||
750b05f2 FD |
309 | list_add(&event_notifier_group->node, &event_notifier_groups); |
310 | ||
311 | mutex_unlock(&sessions_mutex); | |
312 | ||
313 | return event_notifier_group; | |
314 | ||
315 | create_error: | |
316 | lttng_kvfree(event_notifier_group); | |
317 | nomem: | |
318 | if (transport) | |
319 | module_put(transport->owner); | |
320 | notransport: | |
321 | mutex_unlock(&sessions_mutex); | |
322 | return NULL; | |
323 | } | |
324 | ||
d83004aa JD |
325 | void metadata_cache_destroy(struct kref *kref) |
326 | { | |
327 | struct lttng_metadata_cache *cache = | |
328 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 329 | vfree(cache->data); |
d83004aa | 330 | kfree(cache); |
4e3c1b9b MD |
331 | } |
332 | ||
a90917c3 | 333 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 334 | { |
a90917c3 | 335 | struct lttng_channel *chan, *tmpchan; |
a67ba386 | 336 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 337 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 338 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 339 | int ret; |
4e3c1b9b MD |
340 | |
341 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 342 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 343 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 344 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
345 | WARN_ON(ret); |
346 | } | |
a67ba386 MD |
347 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
348 | ret = _lttng_event_unregister(event_recorder_priv->pub); | |
dda6a249 MD |
349 | WARN_ON(ret); |
350 | } | |
abcca994 | 351 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 352 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 353 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
354 | WARN_ON(ret); |
355 | } | |
b2bc0bc8 | 356 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 357 | &session->enablers_head, node) |
b2bc0bc8 | 358 | lttng_event_enabler_destroy(event_enabler); |
a67ba386 MD |
359 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->events, node) |
360 | _lttng_event_destroy(event_recorder_priv->pub); | |
d83004aa JD |
361 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
362 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 363 | _lttng_channel_destroy(chan); |
d83004aa | 364 | } |
ab036a63 | 365 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
366 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
367 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 368 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
369 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
370 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
371 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
372 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
373 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
374 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 375 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
376 | list_del(&session->list); |
377 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 378 | lttng_kvfree(session); |
4e3c1b9b MD |
379 | } |
380 | ||
dffef45d FD |
381 | void lttng_event_notifier_group_destroy( |
382 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 383 | { |
dffef45d | 384 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 385 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
386 | int ret; |
387 | ||
750b05f2 FD |
388 | if (!event_notifier_group) |
389 | return; | |
390 | ||
391 | mutex_lock(&sessions_mutex); | |
dffef45d | 392 | |
3b82c4e1 | 393 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
394 | WARN_ON(ret); |
395 | ||
a67ba386 MD |
396 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
397 | &event_notifier_group->event_notifiers_head, node) { | |
398 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
399 | WARN_ON(ret); |
400 | } | |
401 | ||
b01155ba FD |
402 | /* Wait for in-flight event notifier to complete */ |
403 | synchronize_trace(); | |
404 | ||
21f58fb7 FD |
405 | irq_work_sync(&event_notifier_group->wakeup_pending); |
406 | ||
8a8ac9a8 FD |
407 | kfree(event_notifier_group->sc_filter); |
408 | ||
dffef45d FD |
409 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
410 | &event_notifier_group->enablers_head, node) | |
411 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
412 | ||
a67ba386 MD |
413 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
414 | &event_notifier_group->event_notifiers_head, node) | |
415 | _lttng_event_notifier_destroy(event_notifier_priv->pub); | |
dffef45d | 416 | |
99f52fcc FD |
417 | if (event_notifier_group->error_counter) { |
418 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 419 | |
99f52fcc FD |
420 | error_counter->ops->counter_destroy(error_counter->counter); |
421 | module_put(error_counter->transport->owner); | |
422 | lttng_kvfree(error_counter); | |
423 | event_notifier_group->error_counter = NULL; | |
424 | } | |
425 | ||
750b05f2 FD |
426 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
427 | module_put(event_notifier_group->transport->owner); | |
428 | list_del(&event_notifier_group->node); | |
dffef45d | 429 | |
750b05f2 FD |
430 | mutex_unlock(&sessions_mutex); |
431 | lttng_kvfree(event_notifier_group); | |
432 | } | |
433 | ||
601252cf MD |
434 | int lttng_session_statedump(struct lttng_session *session) |
435 | { | |
436 | int ret; | |
437 | ||
438 | mutex_lock(&sessions_mutex); | |
439 | ret = lttng_statedump_start(session); | |
440 | mutex_unlock(&sessions_mutex); | |
441 | return ret; | |
442 | } | |
443 | ||
a90917c3 | 444 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
445 | { |
446 | int ret = 0; | |
a90917c3 | 447 | struct lttng_channel *chan; |
c0e31d2e MD |
448 | |
449 | mutex_lock(&sessions_mutex); | |
450 | if (session->active) { | |
451 | ret = -EBUSY; | |
452 | goto end; | |
453 | } | |
c099397a | 454 | |
3c997079 MD |
455 | /* Set transient enabler state to "enabled" */ |
456 | session->tstate = 1; | |
457 | ||
4ef81e4a | 458 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 459 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 460 | |
c099397a MD |
461 | /* |
462 | * Snapshot the number of events per channel to know the type of header | |
463 | * we need to use. | |
464 | */ | |
465 | list_for_each_entry(chan, &session->chan, list) { | |
466 | if (chan->header_type) | |
467 | continue; /* don't change it if session stop/restart */ | |
468 | if (chan->free_event_id < 31) | |
469 | chan->header_type = 1; /* compact */ | |
470 | else | |
471 | chan->header_type = 2; /* large */ | |
472 | } | |
473 | ||
64af2437 | 474 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
475 | list_for_each_entry(chan, &session->chan, list) { |
476 | if (chan->channel_type != METADATA_CHANNEL) | |
477 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
478 | } | |
64af2437 | 479 | |
a8f2d0c7 MJ |
480 | WRITE_ONCE(session->active, 1); |
481 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 482 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 483 | if (ret) { |
a8f2d0c7 | 484 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
485 | goto end; |
486 | } | |
487 | ret = lttng_statedump_start(session); | |
360f38ea | 488 | if (ret) |
a8f2d0c7 | 489 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
490 | end: |
491 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 492 | return ret; |
c0e31d2e MD |
493 | } |
494 | ||
a90917c3 | 495 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
496 | { |
497 | int ret = 0; | |
64af2437 | 498 | struct lttng_channel *chan; |
c0e31d2e MD |
499 | |
500 | mutex_lock(&sessions_mutex); | |
501 | if (!session->active) { | |
502 | ret = -EBUSY; | |
503 | goto end; | |
504 | } | |
a8f2d0c7 | 505 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
506 | |
507 | /* Set transient enabler state to "disabled" */ | |
508 | session->tstate = 0; | |
b2bc0bc8 | 509 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
510 | |
511 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
512 | list_for_each_entry(chan, &session->chan, list) { |
513 | if (chan->channel_type != METADATA_CHANNEL) | |
514 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
515 | } | |
c0e31d2e MD |
516 | end: |
517 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 518 | return ret; |
c0e31d2e MD |
519 | } |
520 | ||
9616f0bf JD |
521 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
522 | { | |
523 | int ret = 0; | |
524 | struct lttng_channel *chan; | |
a67ba386 | 525 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
9616f0bf JD |
526 | struct lttng_metadata_cache *cache = session->metadata_cache; |
527 | struct lttng_metadata_stream *stream; | |
528 | ||
529 | mutex_lock(&sessions_mutex); | |
530 | if (!session->active) { | |
531 | ret = -EBUSY; | |
532 | goto end; | |
533 | } | |
534 | ||
535 | mutex_lock(&cache->lock); | |
536 | memset(cache->data, 0, cache->cache_alloc); | |
537 | cache->metadata_written = 0; | |
538 | cache->version++; | |
539 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
540 | stream->metadata_out = 0; | |
541 | stream->metadata_in = 0; | |
542 | } | |
543 | mutex_unlock(&cache->lock); | |
544 | ||
545 | session->metadata_dumped = 0; | |
546 | list_for_each_entry(chan, &session->chan, list) { | |
547 | chan->metadata_dumped = 0; | |
548 | } | |
549 | ||
a67ba386 MD |
550 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
551 | event_recorder_priv->metadata_dumped = 0; | |
9616f0bf JD |
552 | } |
553 | ||
554 | ret = _lttng_session_metadata_statedump(session); | |
555 | ||
556 | end: | |
557 | mutex_unlock(&sessions_mutex); | |
558 | return ret; | |
559 | } | |
560 | ||
a90917c3 | 561 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 562 | { |
3c997079 | 563 | int ret = 0; |
e64957da | 564 | |
3c997079 MD |
565 | mutex_lock(&sessions_mutex); |
566 | if (channel->channel_type == METADATA_CHANNEL) { | |
567 | ret = -EPERM; | |
568 | goto end; | |
569 | } | |
570 | if (channel->enabled) { | |
571 | ret = -EEXIST; | |
572 | goto end; | |
573 | } | |
574 | /* Set transient enabler state to "enabled" */ | |
575 | channel->tstate = 1; | |
b2bc0bc8 | 576 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 577 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 578 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
579 | end: |
580 | mutex_unlock(&sessions_mutex); | |
581 | return ret; | |
e64957da MD |
582 | } |
583 | ||
a90917c3 | 584 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 585 | { |
3c997079 | 586 | int ret = 0; |
e64957da | 587 | |
3c997079 MD |
588 | mutex_lock(&sessions_mutex); |
589 | if (channel->channel_type == METADATA_CHANNEL) { | |
590 | ret = -EPERM; | |
591 | goto end; | |
592 | } | |
593 | if (!channel->enabled) { | |
594 | ret = -EEXIST; | |
595 | goto end; | |
596 | } | |
597 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 598 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
599 | /* Set transient enabler state to "enabled" */ |
600 | channel->tstate = 0; | |
b2bc0bc8 | 601 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
602 | end: |
603 | mutex_unlock(&sessions_mutex); | |
604 | return ret; | |
e64957da MD |
605 | } |
606 | ||
a67ba386 | 607 | int lttng_event_enable(struct lttng_kernel_event_recorder *event_recorder) |
e64957da | 608 | { |
a67ba386 | 609 | struct lttng_kernel_event_common *event = &event_recorder->parent; |
3c997079 | 610 | int ret = 0; |
e64957da | 611 | |
3c997079 | 612 | mutex_lock(&sessions_mutex); |
a67ba386 | 613 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
614 | ret = -EPERM; |
615 | goto end; | |
616 | } | |
617 | if (event->enabled) { | |
618 | ret = -EEXIST; | |
619 | goto end; | |
620 | } | |
a67ba386 | 621 | switch (event->priv->instrumentation) { |
606828e4 MD |
622 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
623 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
624 | ret = -EINVAL; |
625 | break; | |
b4a75708 | 626 | |
606828e4 MD |
627 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
628 | case LTTNG_KERNEL_ABI_UPROBE: | |
a8f2d0c7 | 629 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 630 | break; |
b4a75708 | 631 | |
606828e4 | 632 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 633 | ret = lttng_kretprobes_event_enable_state(event_recorder, 1); |
a0493bef | 634 | break; |
b4a75708 | 635 | |
606828e4 MD |
636 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
637 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
638 | default: |
639 | WARN_ON_ONCE(1); | |
640 | ret = -EINVAL; | |
641 | } | |
3c997079 MD |
642 | end: |
643 | mutex_unlock(&sessions_mutex); | |
644 | return ret; | |
e64957da MD |
645 | } |
646 | ||
a67ba386 | 647 | int lttng_event_disable(struct lttng_kernel_event_recorder *event_recorder) |
e64957da | 648 | { |
a67ba386 | 649 | struct lttng_kernel_event_common *event = &event_recorder->parent; |
3c997079 | 650 | int ret = 0; |
e64957da | 651 | |
3c997079 | 652 | mutex_lock(&sessions_mutex); |
a67ba386 | 653 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
654 | ret = -EPERM; |
655 | goto end; | |
656 | } | |
657 | if (!event->enabled) { | |
658 | ret = -EEXIST; | |
659 | goto end; | |
660 | } | |
a67ba386 | 661 | switch (event->priv->instrumentation) { |
606828e4 MD |
662 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
663 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
664 | ret = -EINVAL; |
665 | break; | |
b4a75708 | 666 | |
606828e4 MD |
667 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
668 | case LTTNG_KERNEL_ABI_UPROBE: | |
a8f2d0c7 | 669 | WRITE_ONCE(event->enabled, 0); |
a0493bef | 670 | break; |
b4a75708 | 671 | |
606828e4 | 672 | case LTTNG_KERNEL_ABI_KRETPROBE: |
b4a75708 | 673 | |
a67ba386 | 674 | ret = lttng_kretprobes_event_enable_state(event_recorder, 0); |
a0493bef | 675 | break; |
b4a75708 | 676 | |
606828e4 MD |
677 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
678 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
679 | default: |
680 | WARN_ON_ONCE(1); | |
681 | ret = -EINVAL; | |
682 | } | |
3c997079 MD |
683 | end: |
684 | mutex_unlock(&sessions_mutex); | |
685 | return ret; | |
e64957da MD |
686 | } |
687 | ||
a67ba386 | 688 | int lttng_event_notifier_enable(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 689 | { |
a67ba386 | 690 | struct lttng_kernel_event_common *event = &event_notifier->parent; |
dffef45d FD |
691 | int ret = 0; |
692 | ||
693 | mutex_lock(&sessions_mutex); | |
a67ba386 | 694 | if (event->enabled) { |
dffef45d FD |
695 | ret = -EEXIST; |
696 | goto end; | |
697 | } | |
a67ba386 | 698 | switch (event->priv->instrumentation) { |
606828e4 MD |
699 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
700 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
701 | ret = -EINVAL; |
702 | break; | |
b4a75708 | 703 | |
606828e4 MD |
704 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
705 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 706 | WRITE_ONCE(event->enabled, 1); |
2b16f0c9 | 707 | break; |
b4a75708 | 708 | |
606828e4 MD |
709 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
710 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
711 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
712 | default: |
713 | WARN_ON_ONCE(1); | |
714 | ret = -EINVAL; | |
715 | } | |
716 | end: | |
717 | mutex_unlock(&sessions_mutex); | |
718 | return ret; | |
719 | } | |
720 | ||
a67ba386 | 721 | int lttng_event_notifier_disable(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 722 | { |
a67ba386 | 723 | struct lttng_kernel_event_common *event = &event_notifier->parent; |
dffef45d FD |
724 | int ret = 0; |
725 | ||
726 | mutex_lock(&sessions_mutex); | |
a67ba386 | 727 | if (!event->enabled) { |
dffef45d FD |
728 | ret = -EEXIST; |
729 | goto end; | |
730 | } | |
a67ba386 | 731 | switch (event->priv->instrumentation) { |
606828e4 MD |
732 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
733 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
734 | ret = -EINVAL; |
735 | break; | |
b4a75708 | 736 | |
606828e4 MD |
737 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
738 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 739 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 740 | break; |
b4a75708 | 741 | |
606828e4 MD |
742 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
743 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
744 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
745 | default: |
746 | WARN_ON_ONCE(1); | |
747 | ret = -EINVAL; | |
748 | } | |
749 | end: | |
750 | mutex_unlock(&sessions_mutex); | |
751 | return ret; | |
752 | } | |
753 | ||
a90917c3 | 754 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
755 | const char *transport_name, |
756 | void *buf_addr, | |
4e3c1b9b MD |
757 | size_t subbuf_size, size_t num_subbuf, |
758 | unsigned int switch_timer_interval, | |
d83004aa JD |
759 | unsigned int read_timer_interval, |
760 | enum channel_type channel_type) | |
4e3c1b9b | 761 | { |
a90917c3 MD |
762 | struct lttng_channel *chan; |
763 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
764 | |
765 | mutex_lock(&sessions_mutex); | |
d83004aa | 766 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 767 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 768 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 769 | if (!transport) { |
5a15f70c | 770 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 771 | transport_name); |
c0e31d2e | 772 | goto notransport; |
f3d01b96 | 773 | } |
a33c9927 | 774 | if (!try_module_get(transport->owner)) { |
5a15f70c | 775 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
776 | goto notransport; |
777 | } | |
a90917c3 | 778 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 779 | if (!chan) |
c0e31d2e | 780 | goto nomem; |
4e3c1b9b | 781 | chan->session = session; |
05d32c64 | 782 | chan->id = session->free_chan_id++; |
3b731ab1 | 783 | chan->ops = &transport->ops; |
125b4df4 MD |
784 | /* |
785 | * Note: the channel creation op already writes into the packet | |
786 | * headers. Therefore the "chan" information used as input | |
787 | * should be already accessible. | |
788 | */ | |
5f5ddf01 MD |
789 | chan->chan = transport->ops.channel_create(transport_name, |
790 | chan, buf_addr, subbuf_size, num_subbuf, | |
791 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
792 | if (!chan->chan) |
793 | goto create_error; | |
3c997079 | 794 | chan->tstate = 1; |
e64957da | 795 | chan->enabled = 1; |
a33c9927 | 796 | chan->transport = transport; |
d83004aa | 797 | chan->channel_type = channel_type; |
4e3c1b9b MD |
798 | list_add(&chan->list, &session->chan); |
799 | mutex_unlock(&sessions_mutex); | |
800 | return chan; | |
801 | ||
f3d01b96 MD |
802 | create_error: |
803 | kfree(chan); | |
c0e31d2e | 804 | nomem: |
a33c9927 MD |
805 | if (transport) |
806 | module_put(transport->owner); | |
c0e31d2e | 807 | notransport: |
e5382b6d | 808 | active: |
4e3c1b9b MD |
809 | mutex_unlock(&sessions_mutex); |
810 | return NULL; | |
811 | } | |
812 | ||
813 | /* | |
d83004aa JD |
814 | * Only used internally at session destruction for per-cpu channels, and |
815 | * when metadata channel is released. | |
816 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 817 | */ |
aa7c23a9 | 818 | static |
a90917c3 | 819 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 820 | { |
11b5a3c2 | 821 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 822 | module_put(chan->transport->owner); |
4e3c1b9b | 823 | list_del(&chan->list); |
437d5aa5 | 824 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
825 | kfree(chan); |
826 | } | |
827 | ||
d83004aa JD |
828 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
829 | { | |
830 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
831 | ||
832 | /* Protect the metadata cache with the sessions_mutex. */ | |
833 | mutex_lock(&sessions_mutex); | |
834 | _lttng_channel_destroy(chan); | |
835 | mutex_unlock(&sessions_mutex); | |
836 | } | |
837 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
838 | ||
839 | static | |
840 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
841 | { | |
842 | stream->finalized = 1; | |
843 | wake_up_interruptible(&stream->read_wait); | |
844 | } | |
845 | ||
a101fa10 | 846 | |
e5382b6d MD |
847 | /* |
848 | * Supports event creation while tracing session is active. | |
3c997079 | 849 | * Needs to be called with sessions mutex held. |
e5382b6d | 850 | */ |
a67ba386 | 851 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 852 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 853 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 854 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 855 | { |
3c997079 | 856 | struct lttng_session *session = chan->session; |
a67ba386 MD |
857 | struct lttng_kernel_event_recorder *event_recorder; |
858 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
859 | const char *event_name; |
860 | struct hlist_head *head; | |
3d084699 | 861 | int ret; |
4e3c1b9b | 862 | |
abc0446a | 863 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 864 | ret = -EMFILE; |
e5382b6d | 865 | goto full; |
abc0446a | 866 | } |
3c997079 MD |
867 | |
868 | switch (itype) { | |
606828e4 | 869 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 870 | event_name = event_desc->event_name; |
3c997079 | 871 | break; |
b4a75708 | 872 | |
606828e4 MD |
873 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
874 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
875 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
876 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
877 | event_name = event_param->name; |
878 | break; | |
b4a75708 | 879 | |
606828e4 MD |
880 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
881 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
882 | default: |
883 | WARN_ON_ONCE(1); | |
884 | ret = -EINVAL; | |
885 | goto type_error; | |
886 | } | |
4a11ef1c FD |
887 | |
888 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
889 | LTTNG_EVENT_HT_SIZE, event_name); | |
a67ba386 MD |
890 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
891 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
892 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 893 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 894 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
895 | ret = -EEXIST; |
896 | goto exist; | |
abc0446a MD |
897 | } |
898 | } | |
3c997079 | 899 | |
a67ba386 MD |
900 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
901 | if (!event_recorder) { | |
4cf0bf51 | 902 | ret = -ENOMEM; |
4e3c1b9b | 903 | goto cache_error; |
abc0446a | 904 | } |
a67ba386 MD |
905 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
906 | if (!event_recorder_priv) { | |
907 | ret = -ENOMEM; | |
908 | goto cache_private_error; | |
909 | } | |
910 | event_recorder_priv->pub = event_recorder; | |
911 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
912 | event_recorder->priv = event_recorder_priv; | |
913 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
914 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
915 | ||
916 | event_recorder->chan = chan; | |
917 | event_recorder->priv->id = chan->free_event_id++; | |
918 | event_recorder->priv->parent.instrumentation = itype; | |
919 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
920 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
921 | |
922 | switch (itype) { | |
606828e4 | 923 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 924 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
925 | event_recorder->parent.enabled = 0; |
926 | event_recorder->priv->parent.registered = 0; | |
927 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
928 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 929 | ret = -ENOENT; |
d3dbe23c | 930 | goto register_error; |
abc0446a | 931 | } |
3c997079 MD |
932 | /* Populate lttng_event structure before event registration. */ |
933 | smp_wmb(); | |
baf20995 | 934 | break; |
b4a75708 | 935 | |
606828e4 | 936 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
937 | /* |
938 | * Needs to be explicitly enabled after creation, since | |
939 | * we may want to apply filters. | |
940 | */ | |
a67ba386 MD |
941 | event_recorder->parent.enabled = 0; |
942 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
943 | /* |
944 | * Populate lttng_event structure before event | |
945 | * registration. | |
946 | */ | |
947 | smp_wmb(); | |
8bf17deb | 948 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
949 | event_param->u.kprobe.symbol_name, |
950 | event_param->u.kprobe.offset, | |
951 | event_param->u.kprobe.addr, | |
a67ba386 | 952 | event_recorder); |
abc0446a | 953 | if (ret) { |
4cf0bf51 | 954 | ret = -EINVAL; |
d6d808f3 | 955 | goto register_error; |
abc0446a | 956 | } |
a67ba386 | 957 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 958 | WARN_ON_ONCE(!ret); |
d6d808f3 | 959 | break; |
b4a75708 | 960 | |
606828e4 | 961 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 962 | { |
a67ba386 MD |
963 | struct lttng_kernel_event_recorder *event_recorder_return; |
964 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
965 | |
966 | /* kretprobe defines 2 events */ | |
a0493bef MD |
967 | /* |
968 | * Needs to be explicitly enabled after creation, since | |
969 | * we may want to apply filters. | |
970 | */ | |
a67ba386 MD |
971 | event_recorder->parent.enabled = 0; |
972 | event_recorder->priv->parent.registered = 1; | |
973 | ||
974 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
975 | if (!event_recorder_return) { | |
976 | ret = -ENOMEM; | |
977 | goto register_error; | |
978 | } | |
979 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
980 | if (!event_recorder_return_priv) { | |
981 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 982 | ret = -ENOMEM; |
7371f44c | 983 | goto register_error; |
abc0446a | 984 | } |
a67ba386 MD |
985 | event_recorder_return_priv->pub = event_recorder_return; |
986 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
987 | event_recorder_return->priv = event_recorder_return_priv; | |
988 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
989 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
990 | ||
991 | event_recorder_return->chan = chan; | |
992 | event_recorder_return->priv->id = chan->free_event_id++; | |
993 | event_recorder_return->priv->parent.instrumentation = itype; | |
994 | event_recorder_return->parent.enabled = 0; | |
995 | event_recorder_return->priv->parent.registered = 1; | |
996 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
997 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 998 | /* |
a90917c3 | 999 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1000 | */ |
1001 | smp_wmb(); | |
3c997079 | 1002 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1003 | event_param->u.kretprobe.symbol_name, |
1004 | event_param->u.kretprobe.offset, | |
1005 | event_param->u.kretprobe.addr, | |
a67ba386 | 1006 | event_recorder, event_recorder_return); |
7371f44c | 1007 | if (ret) { |
a67ba386 MD |
1008 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1009 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1010 | ret = -EINVAL; |
7371f44c MD |
1011 | goto register_error; |
1012 | } | |
1013 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1014 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1015 | WARN_ON_ONCE(!ret); |
a67ba386 | 1016 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1017 | WARN_ON_ONCE(!ret); |
a90917c3 | 1018 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
a67ba386 | 1019 | event_recorder_return); |
abc0446a | 1020 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1021 | if (ret) { |
a67ba386 MD |
1022 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1023 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1024 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1025 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1026 | goto statedump_error; |
1027 | } | |
a67ba386 | 1028 | list_add(&event_recorder_return->priv->node, &chan->session->events); |
7371f44c MD |
1029 | break; |
1030 | } | |
b4a75708 | 1031 | |
606828e4 | 1032 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1033 | /* |
1034 | * Needs to be explicitly enabled after creation, since | |
1035 | * we may want to apply filters. | |
1036 | */ | |
a67ba386 MD |
1037 | event_recorder->parent.enabled = 0; |
1038 | event_recorder->priv->parent.registered = 0; | |
1039 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1040 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1041 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1042 | ret = -EINVAL; |
1043 | goto register_error; | |
606828e4 | 1044 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1045 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1046 | break; |
606828e4 | 1047 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1048 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1049 | break; |
1050 | } | |
1051 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1052 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1053 | ret = -EINVAL; |
1054 | goto register_error; | |
606828e4 | 1055 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1056 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1057 | break; |
606828e4 | 1058 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1059 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1060 | break; |
1061 | } | |
a67ba386 | 1062 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1063 | ret = -EINVAL; |
259b6cb3 | 1064 | goto register_error; |
abc0446a | 1065 | } |
1ec65de1 | 1066 | break; |
b4a75708 | 1067 | |
606828e4 | 1068 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1069 | /* |
1070 | * Needs to be explicitly enabled after creation, since | |
1071 | * we may want to apply filters. | |
1072 | */ | |
a67ba386 MD |
1073 | event_recorder->parent.enabled = 0; |
1074 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1075 | |
a344f64b FD |
1076 | /* |
1077 | * Populate lttng_event structure before event | |
1078 | * registration. | |
1079 | */ | |
1080 | smp_wmb(); | |
149b9a9d | 1081 | |
83b802dc | 1082 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1083 | event_param->u.uprobe.fd, |
a67ba386 | 1084 | event_recorder); |
149b9a9d YB |
1085 | if (ret) |
1086 | goto register_error; | |
a67ba386 | 1087 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1088 | WARN_ON_ONCE(!ret); |
1089 | break; | |
b4a75708 | 1090 | |
606828e4 MD |
1091 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1092 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1093 | default: |
1094 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1095 | ret = -EINVAL; |
df07930b | 1096 | goto register_error; |
baf20995 | 1097 | } |
a67ba386 | 1098 | ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder); |
abc0446a MD |
1099 | WARN_ON_ONCE(ret > 0); |
1100 | if (ret) { | |
c099397a | 1101 | goto statedump_error; |
abc0446a | 1102 | } |
a67ba386 MD |
1103 | hlist_add_head(&event_recorder->priv->hlist, head); |
1104 | list_add(&event_recorder->priv->node, &chan->session->events); | |
1105 | return event_recorder; | |
4e3c1b9b | 1106 | |
c099397a | 1107 | statedump_error: |
259b6cb3 | 1108 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1109 | register_error: |
a67ba386 MD |
1110 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1111 | cache_private_error: | |
1112 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1113 | cache_error: |
1114 | exist: | |
3c997079 | 1115 | type_error: |
e5382b6d | 1116 | full: |
4cf0bf51 | 1117 | return ERR_PTR(ret); |
4e3c1b9b MD |
1118 | } |
1119 | ||
a67ba386 | 1120 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1121 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1122 | uint64_t token, uint64_t error_counter_index, |
1123 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1124 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1125 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1126 | { |
a67ba386 MD |
1127 | struct lttng_kernel_event_notifier *event_notifier; |
1128 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1129 | struct lttng_counter *error_counter; |
dffef45d FD |
1130 | const char *event_name; |
1131 | struct hlist_head *head; | |
1132 | int ret; | |
1133 | ||
1134 | switch (itype) { | |
606828e4 | 1135 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1136 | event_name = event_desc->event_name; |
b01155ba | 1137 | break; |
b4a75708 | 1138 | |
606828e4 MD |
1139 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1140 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1141 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1142 | event_name = event_notifier_param->event.name; |
1143 | break; | |
b4a75708 | 1144 | |
606828e4 MD |
1145 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1146 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1147 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1148 | default: |
1149 | WARN_ON_ONCE(1); | |
1150 | ret = -EINVAL; | |
1151 | goto type_error; | |
1152 | } | |
1153 | ||
1154 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1155 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1156 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1157 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1158 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1159 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1160 | && event_notifier_group == event_notifier_priv->group |
1161 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1162 | ret = -EEXIST; |
1163 | goto exist; | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1168 | if (!event_notifier) { | |
1169 | ret = -ENOMEM; | |
1170 | goto cache_error; | |
1171 | } | |
a67ba386 MD |
1172 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1173 | if (!event_notifier_priv) { | |
1174 | ret = -ENOMEM; | |
1175 | goto cache_private_error; | |
1176 | } | |
1177 | event_notifier_priv->pub = event_notifier; | |
1178 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1179 | event_notifier->priv = event_notifier_priv; | |
1180 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1181 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1182 | ||
1183 | event_notifier->priv->group = event_notifier_group; | |
1184 | event_notifier->priv->parent.user_token = token; | |
1185 | event_notifier->priv->error_counter_index = error_counter_index; | |
1186 | event_notifier->priv->num_captures = 0; | |
1187 | event_notifier->priv->parent.instrumentation = itype; | |
1188 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1189 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1190 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1191 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
dffef45d FD |
1192 | |
1193 | switch (itype) { | |
606828e4 | 1194 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1195 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1196 | event_notifier->parent.enabled = 0; |
1197 | event_notifier->priv->parent.registered = 0; | |
1198 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1199 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1200 | ret = -ENOENT; |
1201 | goto register_error; | |
1202 | } | |
1203 | /* Populate lttng_event_notifier structure before event registration. */ | |
1204 | smp_wmb(); | |
1205 | break; | |
b4a75708 | 1206 | |
606828e4 | 1207 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 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 = 1; | |
2b16f0c9 FD |
1214 | /* |
1215 | * Populate lttng_event_notifier structure before event | |
1216 | * registration. | |
1217 | */ | |
1218 | smp_wmb(); | |
1219 | ret = lttng_kprobes_register_event_notifier( | |
1220 | event_notifier_param->event.u.kprobe.symbol_name, | |
1221 | event_notifier_param->event.u.kprobe.offset, | |
1222 | event_notifier_param->event.u.kprobe.addr, | |
1223 | event_notifier); | |
1224 | if (ret) { | |
1225 | ret = -EINVAL; | |
1226 | goto register_error; | |
1227 | } | |
a67ba386 | 1228 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1229 | WARN_ON_ONCE(!ret); |
1230 | break; | |
b4a75708 | 1231 | |
606828e4 | 1232 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1233 | /* |
1234 | * Needs to be explicitly enabled after creation, since | |
1235 | * we may want to apply filters. | |
1236 | */ | |
a67ba386 MD |
1237 | event_notifier->parent.enabled = 0; |
1238 | event_notifier->priv->parent.registered = 0; | |
1239 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1240 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1241 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1242 | ret = -EINVAL; |
1243 | goto register_error; | |
606828e4 | 1244 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1245 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1246 | break; |
606828e4 | 1247 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1248 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1249 | break; |
1250 | } | |
1251 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1252 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1253 | ret = -EINVAL; |
1254 | goto register_error; | |
606828e4 | 1255 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1256 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1257 | break; |
606828e4 | 1258 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1259 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1260 | break; |
1261 | } | |
1262 | ||
a67ba386 | 1263 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1264 | ret = -EINVAL; |
1265 | goto register_error; | |
1266 | } | |
1267 | break; | |
b4a75708 | 1268 | |
606828e4 | 1269 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1270 | /* |
1271 | * Needs to be explicitly enabled after creation, since | |
1272 | * we may want to apply filters. | |
1273 | */ | |
a67ba386 MD |
1274 | event_notifier->parent.enabled = 0; |
1275 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1276 | |
1277 | /* | |
1278 | * Populate lttng_event_notifier structure before | |
1279 | * event_notifier registration. | |
1280 | */ | |
1281 | smp_wmb(); | |
1282 | ||
1283 | ret = lttng_uprobes_register_event_notifier( | |
1284 | event_notifier_param->event.name, | |
1285 | event_notifier_param->event.u.uprobe.fd, | |
1286 | event_notifier); | |
1287 | if (ret) | |
1288 | goto register_error; | |
a67ba386 | 1289 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1290 | WARN_ON_ONCE(!ret); |
1291 | break; | |
b4a75708 | 1292 | |
606828e4 MD |
1293 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1294 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1295 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1296 | default: |
1297 | WARN_ON_ONCE(1); | |
1298 | ret = -EINVAL; | |
1299 | goto register_error; | |
1300 | } | |
1301 | ||
a67ba386 MD |
1302 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1303 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1304 | |
1305 | /* | |
1306 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1307 | * bucket is currently in use. We trust it. The session lock |
1308 | * synchronizes against concurrent creation of the error | |
1309 | * counter. | |
99f52fcc | 1310 | */ |
ab04d7b1 MD |
1311 | error_counter = event_notifier_group->error_counter; |
1312 | if (error_counter) { | |
99f52fcc FD |
1313 | size_t dimension_index[1]; |
1314 | ||
1315 | /* | |
1316 | * Check that the index is within the boundary of the counter. | |
1317 | */ | |
a67ba386 | 1318 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1319 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1320 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1321 | ret = -EINVAL; |
1322 | goto register_error; | |
1323 | } | |
1324 | ||
a67ba386 | 1325 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1326 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1327 | if (ret) { |
1328 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1329 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1330 | goto register_error; |
1331 | } | |
1332 | } | |
1333 | ||
dffef45d FD |
1334 | return event_notifier; |
1335 | ||
1336 | register_error: | |
a67ba386 MD |
1337 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1338 | cache_private_error: | |
dffef45d FD |
1339 | kmem_cache_free(event_notifier_cache, event_notifier); |
1340 | cache_error: | |
1341 | exist: | |
1342 | type_error: | |
1343 | return ERR_PTR(ret); | |
1344 | } | |
1345 | ||
99f52fcc FD |
1346 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1347 | const size_t *dim_indexes, int32_t cpu, | |
1348 | int64_t *val, bool *overflow, bool *underflow) | |
1349 | { | |
1350 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1351 | cpu, val, overflow, underflow); | |
1352 | } | |
1353 | ||
1354 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1355 | const size_t *dim_indexes, int64_t *val, | |
1356 | bool *overflow, bool *underflow) | |
1357 | { | |
1358 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1359 | val, overflow, underflow); | |
1360 | } | |
1361 | ||
1362 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1363 | const size_t *dim_indexes) | |
1364 | { | |
1365 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1366 | } | |
1367 | ||
a67ba386 | 1368 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 1369 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1370 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1371 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1372 | { |
a67ba386 | 1373 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1374 | |
1375 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1376 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1377 | mutex_unlock(&sessions_mutex); |
1378 | return event; | |
1379 | } | |
1380 | ||
a67ba386 | 1381 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1382 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1383 | uint64_t id, uint64_t error_counter_index, |
1384 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1385 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1386 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1387 | { |
a67ba386 | 1388 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1389 | |
1390 | mutex_lock(&sessions_mutex); | |
1391 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1392 | error_counter_index, event_notifier_group, |
a67ba386 | 1393 | event_notifier_param, itype); |
dffef45d FD |
1394 | mutex_unlock(&sessions_mutex); |
1395 | return event_notifier; | |
1396 | } | |
1397 | ||
3c997079 MD |
1398 | /* Only used for tracepoints for now. */ |
1399 | static | |
a67ba386 | 1400 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1401 | { |
437d5aa5 | 1402 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1403 | int ret = -EINVAL; |
3c997079 | 1404 | |
a67ba386 | 1405 | if (event_recorder->priv->parent.registered) |
3c997079 | 1406 | return; |
4ecb5ad5 | 1407 | |
a67ba386 MD |
1408 | desc = event_recorder->priv->parent.desc; |
1409 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1410 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1411 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 | 1412 | desc->probe_callback, |
a67ba386 | 1413 | event_recorder); |
4ecb5ad5 | 1414 | break; |
b4a75708 | 1415 | |
606828e4 | 1416 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1417 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1418 | break; |
b4a75708 | 1419 | |
606828e4 MD |
1420 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1421 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1422 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1423 | ret = 0; |
1424 | break; | |
b4a75708 | 1425 | |
606828e4 MD |
1426 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1427 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1428 | default: |
1429 | WARN_ON_ONCE(1); | |
1430 | } | |
3c997079 | 1431 | if (!ret) |
a67ba386 | 1432 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1433 | } |
1434 | ||
4e3c1b9b MD |
1435 | /* |
1436 | * Only used internally at session destruction. | |
1437 | */ | |
a67ba386 | 1438 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1439 | { |
a67ba386 | 1440 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1441 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1442 | int ret = -EINVAL; |
1443 | ||
a67ba386 | 1444 | if (!event_priv->registered) |
3c997079 MD |
1445 | return 0; |
1446 | ||
a67ba386 MD |
1447 | desc = event_priv->desc; |
1448 | switch (event_priv->instrumentation) { | |
606828e4 | 1449 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1450 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
1451 | event_priv->desc->probe_callback, | |
1452 | event_recorder); | |
baf20995 | 1453 | break; |
b4a75708 | 1454 | |
606828e4 | 1455 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1456 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1457 | ret = 0; |
1458 | break; | |
b4a75708 | 1459 | |
606828e4 | 1460 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1461 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1462 | ret = 0; |
1463 | break; | |
b4a75708 | 1464 | |
606828e4 | 1465 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1466 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1467 | break; |
b4a75708 | 1468 | |
606828e4 | 1469 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1470 | ret = 0; |
1471 | break; | |
b4a75708 | 1472 | |
606828e4 | 1473 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1474 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1475 | ret = 0; |
1476 | break; | |
b4a75708 | 1477 | |
606828e4 | 1478 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1479 | default: |
1480 | WARN_ON_ONCE(1); | |
1481 | } | |
3c997079 | 1482 | if (!ret) |
a67ba386 | 1483 | event_priv->registered = 0; |
dda6a249 MD |
1484 | return ret; |
1485 | } | |
1486 | ||
dffef45d FD |
1487 | /* Only used for tracepoints for now. */ |
1488 | static | |
a67ba386 | 1489 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1490 | { |
437d5aa5 | 1491 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1492 | int ret = -EINVAL; |
1493 | ||
a67ba386 | 1494 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1495 | return; |
1496 | ||
a67ba386 MD |
1497 | desc = event_notifier->priv->parent.desc; |
1498 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1499 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1500 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
b01155ba FD |
1501 | desc->event_notifier_callback, |
1502 | event_notifier); | |
1503 | break; | |
b4a75708 | 1504 | |
606828e4 | 1505 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1506 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1507 | break; | |
b4a75708 | 1508 | |
606828e4 MD |
1509 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1510 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1511 | ret = 0; |
1512 | break; | |
b4a75708 | 1513 | |
606828e4 MD |
1514 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1515 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1516 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1517 | default: |
1518 | WARN_ON_ONCE(1); | |
1519 | } | |
1520 | if (!ret) | |
a67ba386 | 1521 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1522 | } |
1523 | ||
1524 | static | |
1525 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1526 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1527 | { |
437d5aa5 | 1528 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1529 | int ret = -EINVAL; |
1530 | ||
a67ba386 | 1531 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1532 | return 0; |
1533 | ||
a67ba386 MD |
1534 | desc = event_notifier->priv->parent.desc; |
1535 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1536 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1537 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
1538 | event_notifier->priv->parent.desc->event_notifier_callback, | |
b01155ba FD |
1539 | event_notifier); |
1540 | break; | |
b4a75708 | 1541 | |
606828e4 | 1542 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1543 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1544 | ret = 0; | |
1545 | break; | |
b4a75708 | 1546 | |
606828e4 | 1547 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1548 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1549 | ret = 0; | |
1550 | break; | |
b4a75708 | 1551 | |
606828e4 | 1552 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1553 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1554 | break; | |
b4a75708 | 1555 | |
606828e4 MD |
1556 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1557 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1558 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1559 | default: |
1560 | WARN_ON_ONCE(1); | |
1561 | } | |
1562 | if (!ret) | |
a67ba386 | 1563 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1564 | return ret; |
1565 | } | |
1566 | ||
dda6a249 MD |
1567 | /* |
1568 | * Only used internally at session destruction. | |
1569 | */ | |
be066e6c | 1570 | static |
a67ba386 | 1571 | void _lttng_event_destroy(struct lttng_kernel_event_recorder *event_recorder) |
dda6a249 | 1572 | { |
a67ba386 | 1573 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
966ad253 MD |
1574 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1575 | ||
a67ba386 | 1576 | switch (event_priv->instrumentation) { |
606828e4 | 1577 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1578 | lttng_event_desc_put(event_priv->desc); |
edeb3137 | 1579 | break; |
b4a75708 | 1580 | |
606828e4 | 1581 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 MD |
1582 | module_put(event_priv->desc->owner); |
1583 | lttng_kprobes_destroy_event_private(event_recorder); | |
edeb3137 | 1584 | break; |
b4a75708 | 1585 | |
606828e4 | 1586 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 MD |
1587 | module_put(event_priv->desc->owner); |
1588 | lttng_kretprobes_destroy_private(event_recorder); | |
7371f44c | 1589 | break; |
b4a75708 | 1590 | |
606828e4 | 1591 | case LTTNG_KERNEL_ABI_SYSCALL: |
259b6cb3 | 1592 | break; |
b4a75708 | 1593 | |
606828e4 | 1594 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 MD |
1595 | module_put(event_priv->desc->owner); |
1596 | lttng_uprobes_destroy_event_private(event_recorder); | |
149b9a9d | 1597 | break; |
b4a75708 | 1598 | |
606828e4 MD |
1599 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1600 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
edeb3137 MD |
1601 | default: |
1602 | WARN_ON_ONCE(1); | |
1603 | } | |
a67ba386 MD |
1604 | list_del(&event_recorder->priv->node); |
1605 | lttng_free_event_filter_runtime(event_recorder); | |
966ad253 MD |
1606 | /* Free event enabler refs */ |
1607 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
a67ba386 | 1608 | &event_priv->enablers_ref_head, node) |
966ad253 | 1609 | kfree(enabler_ref); |
a67ba386 MD |
1610 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1611 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1612 | } |
1613 | ||
dffef45d FD |
1614 | /* |
1615 | * Only used internally at session destruction. | |
1616 | */ | |
1617 | static | |
a67ba386 | 1618 | void _lttng_event_notifier_destroy(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1619 | { |
3ef5cc03 MD |
1620 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1621 | ||
a67ba386 | 1622 | switch (event_notifier->priv->parent.instrumentation) { |
606828e4 | 1623 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1624 | lttng_event_desc_put(event_notifier->priv->parent.desc); |
b01155ba | 1625 | break; |
b4a75708 | 1626 | |
606828e4 | 1627 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1628 | module_put(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1629 | lttng_kprobes_destroy_event_notifier_private(event_notifier); |
1630 | break; | |
b4a75708 | 1631 | |
606828e4 | 1632 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 | 1633 | break; |
b4a75708 | 1634 | |
606828e4 | 1635 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1636 | module_put(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1637 | lttng_uprobes_destroy_event_notifier_private(event_notifier); |
1638 | break; | |
b4a75708 | 1639 | |
606828e4 MD |
1640 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1641 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1642 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1643 | default: |
1644 | WARN_ON_ONCE(1); | |
1645 | } | |
a67ba386 | 1646 | list_del(&event_notifier->priv->node); |
3ef5cc03 MD |
1647 | lttng_free_event_notifier_filter_runtime(event_notifier); |
1648 | /* Free event enabler refs */ | |
1649 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
a67ba386 | 1650 | &event_notifier->priv->parent.enablers_ref_head, node) |
3ef5cc03 | 1651 | kfree(enabler_ref); |
a67ba386 | 1652 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
dffef45d FD |
1653 | kmem_cache_free(event_notifier_cache, event_notifier); |
1654 | } | |
1655 | ||
d1f652f8 MD |
1656 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1657 | enum tracker_type tracker_type) | |
e0130fab | 1658 | { |
d1f652f8 MD |
1659 | switch (tracker_type) { |
1660 | case TRACKER_PID: | |
1661 | return &session->pid_tracker; | |
1662 | case TRACKER_VPID: | |
1663 | return &session->vpid_tracker; | |
1664 | case TRACKER_UID: | |
1665 | return &session->uid_tracker; | |
1666 | case TRACKER_VUID: | |
1667 | return &session->vuid_tracker; | |
1668 | case TRACKER_GID: | |
1669 | return &session->gid_tracker; | |
1670 | case TRACKER_VGID: | |
1671 | return &session->vgid_tracker; | |
1672 | default: | |
1673 | WARN_ON_ONCE(1); | |
1674 | return NULL; | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | int lttng_session_track_id(struct lttng_session *session, | |
1679 | enum tracker_type tracker_type, int id) | |
1680 | { | |
1681 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1682 | int ret; |
1683 | ||
d1f652f8 MD |
1684 | tracker = get_tracker(session, tracker_type); |
1685 | if (!tracker) | |
1686 | return -EINVAL; | |
1687 | if (id < -1) | |
e0130fab MD |
1688 | return -EINVAL; |
1689 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1690 | if (id == -1) { |
1691 | /* track all ids: destroy tracker. */ | |
1692 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1693 | ret = 0; |
1694 | } else { | |
d1f652f8 | 1695 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1696 | } |
e0130fab MD |
1697 | mutex_unlock(&sessions_mutex); |
1698 | return ret; | |
1699 | } | |
1700 | ||
d1f652f8 MD |
1701 | int lttng_session_untrack_id(struct lttng_session *session, |
1702 | enum tracker_type tracker_type, int id) | |
e0130fab | 1703 | { |
d1f652f8 | 1704 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1705 | int ret; |
1706 | ||
d1f652f8 MD |
1707 | tracker = get_tracker(session, tracker_type); |
1708 | if (!tracker) | |
1709 | return -EINVAL; | |
1710 | if (id < -1) | |
e0130fab MD |
1711 | return -EINVAL; |
1712 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1713 | if (id == -1) { |
1714 | /* untrack all ids: replace by empty tracker. */ | |
1715 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1716 | } else { |
d1f652f8 | 1717 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1718 | } |
e0130fab MD |
1719 | mutex_unlock(&sessions_mutex); |
1720 | return ret; | |
1721 | } | |
1722 | ||
7e6f9ef6 | 1723 | static |
d1f652f8 | 1724 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1725 | { |
d1f652f8 MD |
1726 | struct lttng_id_tracker *id_tracker = m->private; |
1727 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1728 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1729 | int iter = 0, i; |
1730 | ||
1731 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1732 | if (id_tracker_p) { |
1733 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1734 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1735 | |
f934e302 | 1736 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1737 | if (iter++ >= *pos) |
1738 | return e; | |
1739 | } | |
1740 | } | |
1741 | } else { | |
d1f652f8 | 1742 | /* ID tracker disabled. */ |
7e6f9ef6 | 1743 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1744 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1745 | } |
1746 | iter++; | |
1747 | } | |
1748 | /* End of list */ | |
1749 | return NULL; | |
1750 | } | |
1751 | ||
1752 | /* Called with sessions_mutex held. */ | |
1753 | static | |
d1f652f8 | 1754 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1755 | { |
d1f652f8 MD |
1756 | struct lttng_id_tracker *id_tracker = m->private; |
1757 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1758 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1759 | int iter = 0, i; |
1760 | ||
1761 | (*ppos)++; | |
d1f652f8 MD |
1762 | if (id_tracker_p) { |
1763 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1764 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1765 | |
f934e302 | 1766 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1767 | if (iter++ >= *ppos) |
1768 | return e; | |
1769 | } | |
1770 | } | |
1771 | } else { | |
d1f652f8 | 1772 | /* ID tracker disabled. */ |
7e6f9ef6 | 1773 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1774 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1775 | iter++; |
1776 | } | |
1777 | ||
1778 | /* End of list */ | |
1779 | return NULL; | |
1780 | } | |
1781 | ||
1782 | static | |
d1f652f8 | 1783 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1784 | { |
1785 | mutex_unlock(&sessions_mutex); | |
1786 | } | |
1787 | ||
1788 | static | |
d1f652f8 | 1789 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1790 | { |
d1f652f8 MD |
1791 | struct lttng_id_tracker *id_tracker = m->private; |
1792 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1793 | int id; | |
7e6f9ef6 | 1794 | |
d1f652f8 | 1795 | if (p == id_tracker_p) { |
7e6f9ef6 | 1796 | /* Tracker disabled. */ |
d1f652f8 | 1797 | id = -1; |
7e6f9ef6 | 1798 | } else { |
d1f652f8 | 1799 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1800 | |
d1f652f8 MD |
1801 | id = lttng_id_tracker_get_node_id(e); |
1802 | } | |
1803 | switch (id_tracker->tracker_type) { | |
1804 | case TRACKER_PID: | |
1805 | seq_printf(m, "process { pid = %d; };\n", id); | |
1806 | break; | |
1807 | case TRACKER_VPID: | |
1808 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1809 | break; | |
1810 | case TRACKER_UID: | |
1811 | seq_printf(m, "user { uid = %d; };\n", id); | |
1812 | break; | |
1813 | case TRACKER_VUID: | |
1814 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1815 | break; | |
1816 | case TRACKER_GID: | |
1817 | seq_printf(m, "group { gid = %d; };\n", id); | |
1818 | break; | |
1819 | case TRACKER_VGID: | |
1820 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1821 | break; | |
1822 | default: | |
1823 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1824 | } |
7e6f9ef6 MD |
1825 | return 0; |
1826 | } | |
1827 | ||
1828 | static | |
d1f652f8 MD |
1829 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1830 | .start = id_list_start, | |
1831 | .next = id_list_next, | |
1832 | .stop = id_list_stop, | |
1833 | .show = id_list_show, | |
7e6f9ef6 MD |
1834 | }; |
1835 | ||
1836 | static | |
d1f652f8 | 1837 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1838 | { |
d1f652f8 | 1839 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1840 | } |
1841 | ||
1842 | static | |
d1f652f8 | 1843 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1844 | { |
1845 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1846 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1847 | int ret; |
1848 | ||
d1f652f8 | 1849 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1850 | ret = seq_release(inode, file); |
d1f652f8 MD |
1851 | if (!ret) |
1852 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1853 | return ret; |
1854 | } | |
1855 | ||
d1f652f8 | 1856 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1857 | .owner = THIS_MODULE, |
d1f652f8 | 1858 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1859 | .read = seq_read, |
1860 | .llseek = seq_lseek, | |
d1f652f8 | 1861 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1862 | }; |
1863 | ||
d1f652f8 MD |
1864 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1865 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1866 | { |
d1f652f8 | 1867 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1868 | struct seq_file *m; |
1869 | int file_fd, ret; | |
1870 | ||
1871 | file_fd = lttng_get_unused_fd(); | |
1872 | if (file_fd < 0) { | |
1873 | ret = file_fd; | |
1874 | goto fd_error; | |
1875 | } | |
1876 | ||
d1f652f8 MD |
1877 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1878 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1879 | NULL, O_RDWR); |
d1f652f8 MD |
1880 | if (IS_ERR(tracker_ids_list_file)) { |
1881 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1882 | goto file_error; |
1883 | } | |
98d7281c MJ |
1884 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1885 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1886 | goto refcount_error; |
1887 | } | |
d1f652f8 | 1888 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1889 | if (ret < 0) |
1890 | goto open_error; | |
d1f652f8 MD |
1891 | m = tracker_ids_list_file->private_data; |
1892 | ||
1893 | m->private = get_tracker(session, tracker_type); | |
1894 | BUG_ON(!m->private); | |
1895 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1896 | |
1897 | return file_fd; | |
1898 | ||
1899 | open_error: | |
9c1f4643 MD |
1900 | atomic_long_dec(&session->file->f_count); |
1901 | refcount_error: | |
d1f652f8 | 1902 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1903 | file_error: |
1904 | put_unused_fd(file_fd); | |
1905 | fd_error: | |
1906 | return ret; | |
1907 | } | |
1908 | ||
3c997079 MD |
1909 | /* |
1910 | * Enabler management. | |
1911 | */ | |
1912 | static | |
4993071a PP |
1913 | int lttng_match_enabler_star_glob(const char *desc_name, |
1914 | const char *pattern) | |
3c997079 | 1915 | { |
cbc19040 MD |
1916 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1917 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1918 | return 0; |
1919 | return 1; | |
1920 | } | |
1921 | ||
1922 | static | |
4ecb5ad5 MD |
1923 | int lttng_match_enabler_name(const char *desc_name, |
1924 | const char *name) | |
3c997079 | 1925 | { |
4ecb5ad5 | 1926 | if (strcmp(desc_name, name)) |
3c997079 MD |
1927 | return 0; |
1928 | return 1; | |
1929 | } | |
1930 | ||
437d5aa5 | 1931 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1932 | struct lttng_enabler *enabler) |
1933 | { | |
4ecb5ad5 | 1934 | const char *desc_name, *enabler_name; |
badfe9f5 | 1935 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1936 | |
1937 | enabler_name = enabler->event_param.name; | |
1938 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1939 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1940 | desc_name = desc->event_name; |
3b861b22 FD |
1941 | switch (enabler->format_type) { |
1942 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1943 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1944 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1945 | return lttng_match_enabler_name(desc_name, enabler_name); |
1946 | default: | |
1947 | return -EINVAL; | |
1948 | } | |
4ecb5ad5 | 1949 | break; |
b4a75708 | 1950 | |
606828e4 | 1951 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1952 | desc_name = desc->event_name; |
badfe9f5 | 1953 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1954 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1955 | compat = true; |
1956 | } | |
4ecb5ad5 MD |
1957 | if (!strncmp(desc_name, "syscall_exit_", |
1958 | strlen("syscall_exit_"))) { | |
1959 | desc_name += strlen("syscall_exit_"); | |
1960 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1961 | strlen("syscall_entry_"))) { | |
1962 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1963 | entry = true; |
4ecb5ad5 MD |
1964 | } else { |
1965 | WARN_ON_ONCE(1); | |
1966 | return -EINVAL; | |
1967 | } | |
badfe9f5 | 1968 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1969 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1970 | break; |
606828e4 | 1971 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1972 | if (!entry) |
1973 | return 0; | |
1974 | break; | |
606828e4 | 1975 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1976 | if (entry) |
1977 | return 0; | |
1978 | break; | |
1979 | default: | |
1980 | return -EINVAL; | |
1981 | } | |
1982 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1983 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1984 | break; |
606828e4 | 1985 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1986 | if (compat) |
1987 | return 0; | |
1988 | break; | |
606828e4 | 1989 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1990 | if (!compat) |
1991 | return 0; | |
1992 | break; | |
1993 | default: | |
1994 | return -EINVAL; | |
1995 | } | |
1996 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1997 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1998 | switch (enabler->format_type) { |
1999 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2000 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2001 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2002 | return lttng_match_enabler_name(desc_name, enabler_name); |
2003 | default: | |
2004 | return -EINVAL; | |
2005 | } | |
2006 | break; | |
606828e4 | 2007 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2008 | return -EINVAL; /* Not implemented. */ |
2009 | default: | |
2010 | return -EINVAL; | |
2011 | } | |
4ecb5ad5 | 2012 | break; |
b4a75708 | 2013 | |
4ecb5ad5 MD |
2014 | default: |
2015 | WARN_ON_ONCE(1); | |
2016 | return -EINVAL; | |
2017 | } | |
3c997079 MD |
2018 | } |
2019 | ||
2020 | static | |
b2bc0bc8 | 2021 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2022 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2023 | { |
b2bc0bc8 FD |
2024 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2025 | event_enabler); | |
2026 | ||
a67ba386 | 2027 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2028 | return 0; |
a67ba386 MD |
2029 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2030 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2031 | return 1; |
2032 | else | |
2033 | return 0; | |
2034 | } | |
2035 | ||
b01155ba FD |
2036 | static |
2037 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2038 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2039 | { |
2040 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2041 | event_notifier_enabler); | |
2042 | ||
a67ba386 | 2043 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2044 | return 0; |
a67ba386 MD |
2045 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2046 | && event_notifier->priv->group == event_notifier_enabler->group | |
2047 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2048 | return 1; |
2049 | else | |
2050 | return 0; | |
2051 | } | |
2052 | ||
3c997079 | 2053 | static |
b2bc0bc8 FD |
2054 | struct lttng_enabler_ref *lttng_enabler_ref( |
2055 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2056 | struct lttng_enabler *enabler) |
2057 | { | |
2058 | struct lttng_enabler_ref *enabler_ref; | |
2059 | ||
b2bc0bc8 | 2060 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2061 | if (enabler_ref->ref == enabler) |
2062 | return enabler_ref; | |
2063 | } | |
2064 | return NULL; | |
2065 | } | |
2066 | ||
3c997079 | 2067 | static |
1b917d6b | 2068 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2069 | { |
b2bc0bc8 | 2070 | struct lttng_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2071 | struct lttng_kernel_probe_desc *probe_desc; |
2072 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2073 | int i; |
2074 | struct list_head *probe_list; | |
2075 | ||
2076 | probe_list = lttng_get_probe_list_head(); | |
2077 | /* | |
2078 | * For each probe event, if we find that a probe event matches | |
2079 | * our enabler, create an associated lttng_event if not | |
2080 | * already present. | |
2081 | */ | |
2082 | list_for_each_entry(probe_desc, probe_list, head) { | |
2083 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2084 | int found = 0; | |
2085 | struct hlist_head *head; | |
a67ba386 MD |
2086 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2087 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2088 | |
2089 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2090 | if (!lttng_desc_match_enabler(desc, |
2091 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2092 | continue; |
3c997079 MD |
2093 | |
2094 | /* | |
2095 | * Check if already created. | |
2096 | */ | |
4a11ef1c FD |
2097 | head = utils_borrow_hash_table_bucket( |
2098 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 2099 | desc->event_name); |
a67ba386 MD |
2100 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2101 | if (event_recorder_private->parent.desc == desc | |
2102 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2103 | found = 1; |
2104 | } | |
2105 | if (found) | |
2106 | continue; | |
2107 | ||
2108 | /* | |
2109 | * We need to create an event for this | |
2110 | * event probe. | |
2111 | */ | |
a67ba386 MD |
2112 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2113 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2114 | if (!event_recorder) { | |
5a15f70c | 2115 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2116 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2117 | } |
2118 | } | |
2119 | } | |
2120 | } | |
2121 | ||
b01155ba FD |
2122 | static |
2123 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2124 | { | |
2125 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2126 | struct lttng_kernel_probe_desc *probe_desc; |
2127 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2128 | int i; |
2129 | struct list_head *probe_list; | |
2130 | ||
2131 | probe_list = lttng_get_probe_list_head(); | |
2132 | /* | |
2133 | * For each probe event, if we find that a probe event matches | |
2134 | * our enabler, create an associated lttng_event_notifier if not | |
2135 | * already present. | |
2136 | */ | |
2137 | list_for_each_entry(probe_desc, probe_list, head) { | |
2138 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2139 | int found = 0; | |
2140 | struct hlist_head *head; | |
a67ba386 MD |
2141 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2142 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2143 | |
2144 | desc = probe_desc->event_desc[i]; | |
2145 | if (!lttng_desc_match_enabler(desc, | |
2146 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2147 | continue; | |
2148 | ||
2149 | /* | |
2150 | * Check if already created. | |
2151 | */ | |
2152 | head = utils_borrow_hash_table_bucket( | |
2153 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2154 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2155 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2156 | if (event_notifier_priv->parent.desc == desc | |
2157 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2158 | found = 1; |
2159 | } | |
2160 | if (found) | |
2161 | continue; | |
2162 | ||
2163 | /* | |
2164 | * We need to create a event_notifier for this event probe. | |
2165 | */ | |
2166 | event_notifier = _lttng_event_notifier_create(desc, | |
2167 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2168 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2169 | event_notifier_group, NULL, |
606828e4 | 2170 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2171 | if (IS_ERR(event_notifier)) { |
2172 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2173 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2174 | } |
2175 | } | |
2176 | } | |
2177 | } | |
2178 | ||
33a39a3c | 2179 | static |
1b917d6b | 2180 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2181 | { |
2182 | int ret; | |
2183 | ||
a67ba386 | 2184 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2185 | WARN_ON_ONCE(ret); |
2186 | } | |
2187 | ||
8a8ac9a8 FD |
2188 | static |
2189 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2190 | { | |
2191 | int ret; | |
2192 | ||
a67ba386 | 2193 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2194 | WARN_ON_ONCE(ret); |
a67ba386 | 2195 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2196 | WARN_ON_ONCE(ret); |
2197 | } | |
2198 | ||
33a39a3c | 2199 | /* |
a67ba386 | 2200 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2201 | * tracepoint probes. |
2202 | * Should be called with sessions mutex held. | |
2203 | */ | |
2204 | static | |
b2bc0bc8 | 2205 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2206 | { |
b2bc0bc8 | 2207 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2208 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2209 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2210 | break; |
b4a75708 | 2211 | |
606828e4 | 2212 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2213 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2214 | break; |
b4a75708 | 2215 | |
33a39a3c MD |
2216 | default: |
2217 | WARN_ON_ONCE(1); | |
2218 | break; | |
2219 | } | |
2220 | } | |
2221 | ||
3c997079 | 2222 | /* |
b2bc0bc8 | 2223 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2224 | * and add backward reference from the event to the enabler. |
2225 | * Should be called with sessions mutex held. | |
2226 | */ | |
2227 | static | |
b2bc0bc8 | 2228 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2229 | { |
b2bc0bc8 FD |
2230 | struct lttng_channel *chan = event_enabler->chan; |
2231 | struct lttng_session *session = event_enabler->chan->session; | |
2232 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
a67ba386 | 2233 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2234 | |
606828e4 MD |
2235 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2236 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2237 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2238 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2239 | int enabled = base_enabler->enabled; |
606828e4 | 2240 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2241 | |
606828e4 | 2242 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 MD |
2243 | WRITE_ONCE(chan->syscall_all_entry, enabled); |
2244 | ||
606828e4 | 2245 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 | 2246 | WRITE_ONCE(chan->syscall_all_exit, enabled); |
badfe9f5 MD |
2247 | } |
2248 | ||
3c997079 | 2249 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2250 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2251 | |
b2bc0bc8 | 2252 | /* For each event matching event_enabler in session event list. */ |
a67ba386 MD |
2253 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2254 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 MD |
2255 | struct lttng_enabler_ref *enabler_ref; |
2256 | ||
a67ba386 | 2257 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2258 | continue; |
a67ba386 | 2259 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2260 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2261 | if (!enabler_ref) { |
2262 | /* | |
2263 | * If no backward ref, create it. | |
b2bc0bc8 | 2264 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2265 | */ |
2266 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2267 | if (!enabler_ref) | |
2268 | return -ENOMEM; | |
b2bc0bc8 | 2269 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2270 | list_add(&enabler_ref->node, |
a67ba386 | 2271 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2272 | } |
2273 | ||
f127e61e MD |
2274 | /* |
2275 | * Link filter bytecodes if not linked yet. | |
2276 | */ | |
a67ba386 | 2277 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2278 | lttng_static_ctx, |
a67ba386 | 2279 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2280 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2281 | } |
2282 | return 0; | |
2283 | } | |
2284 | ||
b01155ba | 2285 | /* |
a67ba386 | 2286 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2287 | * tracepoint probes. |
2288 | * Should be called with sessions mutex held. | |
2289 | */ | |
2290 | static | |
2291 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2292 | { | |
2293 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2294 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2295 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2296 | break; | |
b4a75708 | 2297 | |
606828e4 | 2298 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2299 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2300 | break; | |
b4a75708 | 2301 | |
b01155ba FD |
2302 | default: |
2303 | WARN_ON_ONCE(1); | |
2304 | break; | |
2305 | } | |
2306 | } | |
2307 | ||
2308 | /* | |
2309 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2310 | */ | |
2311 | static | |
8a8ac9a8 FD |
2312 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2313 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2314 | { |
2315 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2316 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2317 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2318 | |
606828e4 MD |
2319 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2320 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2321 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2322 | !strcmp(base_enabler->event_param.name, "*")) { |
2323 | ||
2324 | int enabled = base_enabler->enabled; | |
606828e4 | 2325 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2326 | |
606828e4 | 2327 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2328 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2329 | ||
606828e4 | 2330 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2331 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2332 | ||
2333 | } | |
2334 | ||
b01155ba FD |
2335 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2336 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2337 | ||
2338 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2339 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2340 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2341 | struct lttng_enabler_ref *enabler_ref; |
2342 | ||
2343 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2344 | continue; | |
2345 | ||
a67ba386 | 2346 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2347 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2348 | if (!enabler_ref) { | |
2349 | /* | |
2350 | * If no backward ref, create it. | |
2351 | * Add backward ref from event_notifier to enabler. | |
2352 | */ | |
2353 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2354 | if (!enabler_ref) | |
2355 | return -ENOMEM; | |
2356 | ||
2357 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2358 | event_notifier_enabler); | |
2359 | list_add(&enabler_ref->node, | |
a67ba386 | 2360 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2361 | } |
2362 | ||
2363 | /* | |
2364 | * Link filter bytecodes if not linked yet. | |
2365 | */ | |
a67ba386 MD |
2366 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2367 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2368 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2369 | |
2370 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2371 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2372 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2373 | &event_notifier_enabler->capture_bytecode_head); |
2374 | ||
a67ba386 | 2375 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2376 | } |
2377 | return 0; | |
2378 | } | |
2379 | ||
3c997079 MD |
2380 | /* |
2381 | * Called at module load: connect the probe on all enablers matching | |
2382 | * this event. | |
2383 | * Called with sessions lock held. | |
2384 | */ | |
2385 | int lttng_fix_pending_events(void) | |
2386 | { | |
2387 | struct lttng_session *session; | |
2388 | ||
2389 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2390 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2391 | return 0; |
2392 | } | |
2393 | ||
b01155ba FD |
2394 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2395 | struct lttng_event_notifier_group *event_notifier_group) | |
2396 | { | |
2397 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2398 | ||
2399 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2400 | node) { | |
2401 | if (event_notifier_enabler->base.enabled) | |
2402 | return true; | |
2403 | } | |
2404 | return false; | |
2405 | } | |
2406 | ||
2407 | bool lttng_event_notifier_active(void) | |
2408 | { | |
2409 | struct lttng_event_notifier_group *event_notifier_group; | |
2410 | ||
2411 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2412 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2413 | return true; | |
2414 | } | |
2415 | return false; | |
2416 | } | |
2417 | ||
2418 | int lttng_fix_pending_event_notifiers(void) | |
2419 | { | |
2420 | struct lttng_event_notifier_group *event_notifier_group; | |
2421 | ||
2422 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2423 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2424 | return 0; | |
2425 | } | |
2426 | ||
b2bc0bc8 FD |
2427 | struct lttng_event_enabler *lttng_event_enabler_create( |
2428 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2429 | struct lttng_kernel_abi_event *event_param, |
3c997079 MD |
2430 | struct lttng_channel *chan) |
2431 | { | |
b2bc0bc8 | 2432 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2433 | |
b2bc0bc8 FD |
2434 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2435 | if (!event_enabler) | |
3c997079 | 2436 | return NULL; |
b2bc0bc8 FD |
2437 | event_enabler->base.format_type = format_type; |
2438 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2439 | memcpy(&event_enabler->base.event_param, event_param, | |
2440 | sizeof(event_enabler->base.event_param)); | |
2441 | event_enabler->chan = chan; | |
3c997079 | 2442 | /* ctx left NULL */ |
b2bc0bc8 | 2443 | event_enabler->base.enabled = 0; |
3c997079 | 2444 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2445 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2446 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2447 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2448 | return event_enabler; |
3c997079 MD |
2449 | } |
2450 | ||
b2bc0bc8 | 2451 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2452 | { |
2453 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2454 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2455 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2456 | mutex_unlock(&sessions_mutex); |
2457 | return 0; | |
2458 | } | |
2459 | ||
b2bc0bc8 | 2460 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2461 | { |
2462 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2463 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2464 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2465 | mutex_unlock(&sessions_mutex); |
2466 | return 0; | |
2467 | } | |
2468 | ||
b2bc0bc8 | 2469 | static |
183e8b3a | 2470 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2471 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2472 | { |
89ec2b91 | 2473 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2474 | uint32_t bytecode_len; |
2475 | int ret; | |
2476 | ||
2477 | ret = get_user(bytecode_len, &bytecode->len); | |
2478 | if (ret) | |
2479 | return ret; | |
52cfcdf3 | 2480 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2481 | GFP_KERNEL); |
2482 | if (!bytecode_node) | |
2483 | return -ENOMEM; | |
2484 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2485 | sizeof(*bytecode) + bytecode_len); | |
2486 | if (ret) | |
2487 | goto error_free; | |
b2bc0bc8 | 2488 | |
89ec2b91 | 2489 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2490 | bytecode_node->enabler = enabler; |
2491 | /* Enforce length based on allocated size */ | |
2492 | bytecode_node->bc.len = bytecode_len; | |
2493 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2494 | |
07dfc1d0 MD |
2495 | return 0; |
2496 | ||
2497 | error_free: | |
52cfcdf3 | 2498 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2499 | return ret; |
2500 | } | |
2501 | ||
183e8b3a | 2502 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2503 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2504 | { |
2505 | int ret; | |
183e8b3a | 2506 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2507 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2508 | if (ret) | |
2509 | goto error; | |
2510 | ||
2511 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2512 | return 0; | |
2513 | ||
2514 | error: | |
2515 | return ret; | |
2516 | } | |
2517 | ||
a67ba386 | 2518 | int lttng_event_add_callsite(struct lttng_kernel_event_recorder *event_recorder, |
606828e4 | 2519 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2520 | { |
2521 | ||
a67ba386 | 2522 | switch (event_recorder->priv->parent.instrumentation) { |
606828e4 | 2523 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 2524 | return lttng_uprobes_event_add_callsite(event_recorder, callsite); |
3aed4dca FD |
2525 | default: |
2526 | return -EINVAL; | |
2527 | } | |
2528 | } | |
2529 | ||
3c997079 MD |
2530 | static |
2531 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2532 | { | |
89ec2b91 | 2533 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2534 | |
2535 | /* Destroy filter bytecode */ | |
2536 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2537 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2538 | lttng_kvfree(filter_node); |
07dfc1d0 | 2539 | } |
b2bc0bc8 FD |
2540 | } |
2541 | ||
2542 | static | |
2543 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2544 | { | |
2545 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2546 | |
b2bc0bc8 FD |
2547 | list_del(&event_enabler->node); |
2548 | kfree(event_enabler); | |
3c997079 MD |
2549 | } |
2550 | ||
dffef45d FD |
2551 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2552 | struct lttng_event_notifier_group *event_notifier_group, | |
2553 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2554 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2555 | { |
2556 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2557 | ||
2558 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2559 | if (!event_notifier_enabler) | |
2560 | return NULL; | |
2561 | ||
2562 | event_notifier_enabler->base.format_type = format_type; | |
2563 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2564 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2565 | ||
99f52fcc | 2566 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2567 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2568 | |
8a8ac9a8 FD |
2569 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2570 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2571 | |
2572 | event_notifier_enabler->base.enabled = 0; | |
2573 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2574 | event_notifier_enabler->group = event_notifier_group; | |
2575 | ||
2576 | mutex_lock(&sessions_mutex); | |
2577 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2578 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2579 | |
2580 | mutex_unlock(&sessions_mutex); | |
2581 | ||
2582 | return event_notifier_enabler; | |
2583 | } | |
2584 | ||
2585 | int lttng_event_notifier_enabler_enable( | |
2586 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2587 | { | |
2588 | mutex_lock(&sessions_mutex); | |
2589 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2590 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2591 | mutex_unlock(&sessions_mutex); |
2592 | return 0; | |
2593 | } | |
2594 | ||
2595 | int lttng_event_notifier_enabler_disable( | |
2596 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2597 | { | |
2598 | mutex_lock(&sessions_mutex); | |
2599 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2600 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2601 | mutex_unlock(&sessions_mutex); |
2602 | return 0; | |
2603 | } | |
2604 | ||
183e8b3a | 2605 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2606 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2607 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2608 | { |
2609 | int ret; | |
2610 | ||
183e8b3a | 2611 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2612 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2613 | bytecode); | |
2614 | if (ret) | |
2615 | goto error; | |
2616 | ||
b01155ba | 2617 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2618 | return 0; |
2619 | ||
2620 | error: | |
2621 | return ret; | |
2622 | } | |
2623 | ||
99d223ad FD |
2624 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2625 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2626 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad FD |
2627 | { |
2628 | struct lttng_bytecode_node *bytecode_node; | |
2629 | struct lttng_enabler *enabler = | |
2630 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2631 | uint32_t bytecode_len; | |
2632 | int ret; | |
2633 | ||
2634 | ret = get_user(bytecode_len, &bytecode->len); | |
2635 | if (ret) | |
2636 | return ret; | |
2637 | ||
2638 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2639 | GFP_KERNEL); | |
2640 | if (!bytecode_node) | |
2641 | return -ENOMEM; | |
2642 | ||
2643 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2644 | sizeof(*bytecode) + bytecode_len); | |
2645 | if (ret) | |
2646 | goto error_free; | |
2647 | ||
2648 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2649 | bytecode_node->enabler = enabler; | |
2650 | ||
2651 | /* Enforce length based on allocated size */ | |
2652 | bytecode_node->bc.len = bytecode_len; | |
2653 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2654 | ||
2655 | event_notifier_enabler->num_captures++; | |
2656 | ||
2657 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2658 | goto end; | |
2659 | ||
2660 | error_free: | |
2661 | lttng_kvfree(bytecode_node); | |
2662 | end: | |
2663 | return ret; | |
2664 | } | |
2665 | ||
a67ba386 | 2666 | int lttng_event_notifier_add_callsite(struct lttng_kernel_event_notifier *event_notifier, |
606828e4 | 2667 | struct lttng_kernel_abi_event_callsite __user *callsite) |
9de67196 FD |
2668 | { |
2669 | ||
a67ba386 | 2670 | switch (event_notifier->priv->parent.instrumentation) { |
606828e4 | 2671 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
2672 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, |
2673 | callsite); | |
2674 | default: | |
2675 | return -EINVAL; | |
2676 | } | |
2677 | } | |
2678 | ||
dffef45d FD |
2679 | static |
2680 | void lttng_event_notifier_enabler_destroy( | |
2681 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2682 | { | |
2683 | if (!event_notifier_enabler) { | |
2684 | return; | |
2685 | } | |
2686 | ||
2687 | list_del(&event_notifier_enabler->node); | |
2688 | ||
2689 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2690 | kfree(event_notifier_enabler); | |
2691 | } | |
2692 | ||
3c997079 | 2693 | /* |
b2bc0bc8 | 2694 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2695 | * session. |
2696 | * Should be called with sessions mutex held. | |
2697 | */ | |
2698 | static | |
b2bc0bc8 | 2699 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2700 | { |
b2bc0bc8 | 2701 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2702 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2703 | |
b2bc0bc8 FD |
2704 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2705 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2706 | /* |
2707 | * For each event, if at least one of its enablers is enabled, | |
2708 | * and its channel and session transient states are enabled, we | |
2709 | * enable the event, else we disable it. | |
2710 | */ | |
a67ba386 MD |
2711 | list_for_each_entry(event_recorder_priv, &session->events, node) { |
2712 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
3c997079 | 2713 | struct lttng_enabler_ref *enabler_ref; |
07dfc1d0 MD |
2714 | struct lttng_bytecode_runtime *runtime; |
2715 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2716 | |
a67ba386 | 2717 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2718 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2719 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2720 | /* Enable events */ |
2721 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2722 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2723 | if (enabler_ref->ref->enabled) { |
2724 | enabled = 1; | |
2725 | break; | |
2726 | } | |
2727 | } | |
4ecb5ad5 | 2728 | break; |
b4a75708 | 2729 | |
4ecb5ad5 | 2730 | default: |
3c997079 MD |
2731 | /* Not handled with lazy sync. */ |
2732 | continue; | |
2733 | } | |
2734 | /* | |
2735 | * Enabled state is based on union of enablers, with | |
2736 | * intesection of session and channel transient enable | |
2737 | * states. | |
2738 | */ | |
a67ba386 | 2739 | enabled = enabled && session->tstate && event_recorder->chan->tstate; |
3c997079 | 2740 | |
a67ba386 | 2741 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2742 | /* |
2743 | * Sync tracepoint registration with event enabled | |
2744 | * state. | |
2745 | */ | |
2746 | if (enabled) { | |
a67ba386 | 2747 | register_event(event_recorder); |
3c997079 | 2748 | } else { |
a67ba386 | 2749 | _lttng_event_unregister(event_recorder); |
3c997079 | 2750 | } |
07dfc1d0 MD |
2751 | |
2752 | /* Check if has enablers without bytecode enabled */ | |
2753 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2754 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2755 | if (enabler_ref->ref->enabled |
2756 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2757 | has_enablers_without_bytecode = 1; | |
2758 | break; | |
2759 | } | |
2760 | } | |
a67ba386 | 2761 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
07dfc1d0 MD |
2762 | has_enablers_without_bytecode; |
2763 | ||
2764 | /* Enable filters */ | |
2765 | list_for_each_entry(runtime, | |
a67ba386 | 2766 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) |
0b365677 | 2767 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2768 | } |
2769 | } | |
2770 | ||
2771 | /* | |
2772 | * Apply enablers to session events, adding events to session if need | |
2773 | * be. It is required after each modification applied to an active | |
2774 | * session, and right before session "start". | |
2775 | * "lazy" sync means we only sync if required. | |
2776 | * Should be called with sessions mutex held. | |
2777 | */ | |
2778 | static | |
b2bc0bc8 | 2779 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2780 | { |
2781 | /* We can skip if session is not active */ | |
2782 | if (!session->active) | |
2783 | return; | |
b2bc0bc8 | 2784 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2785 | } |
2786 | ||
b01155ba FD |
2787 | static |
2788 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2789 | { | |
2790 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2791 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2792 | |
2793 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2794 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2795 | ||
2796 | /* | |
2797 | * For each event_notifier, if at least one of its enablers is enabled, | |
2798 | * we enable the event_notifier, else we disable it. | |
2799 | */ | |
a67ba386 MD |
2800 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2801 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2802 | struct lttng_enabler_ref *enabler_ref; |
2803 | struct lttng_bytecode_runtime *runtime; | |
2804 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2805 | ||
a67ba386 | 2806 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2807 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2808 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2809 | /* Enable event_notifiers */ |
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 | enabled = 1; | |
2814 | break; | |
2815 | } | |
2816 | } | |
2817 | break; | |
b4a75708 | 2818 | |
b01155ba FD |
2819 | default: |
2820 | /* Not handled with sync. */ | |
2821 | continue; | |
2822 | } | |
2823 | ||
a67ba386 | 2824 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2825 | /* |
2826 | * Sync tracepoint registration with event_notifier enabled | |
2827 | * state. | |
2828 | */ | |
2829 | if (enabled) { | |
a67ba386 | 2830 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2831 | register_event_notifier(event_notifier); |
2832 | } else { | |
a67ba386 | 2833 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2834 | _lttng_event_notifier_unregister(event_notifier); |
2835 | } | |
2836 | ||
2837 | /* Check if has enablers without bytecode enabled */ | |
2838 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2839 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2840 | if (enabler_ref->ref->enabled |
2841 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2842 | has_enablers_without_bytecode = 1; | |
2843 | break; | |
2844 | } | |
2845 | } | |
a67ba386 | 2846 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
b01155ba FD |
2847 | has_enablers_without_bytecode; |
2848 | ||
2849 | /* Enable filters */ | |
2850 | list_for_each_entry(runtime, | |
a67ba386 | 2851 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) |
0b365677 | 2852 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2853 | |
2854 | /* Enable captures */ | |
2855 | list_for_each_entry(runtime, | |
a67ba386 | 2856 | &event_notifier_priv->capture_bytecode_runtime_head, node) |
99d223ad | 2857 | lttng_bytecode_capture_sync_state(runtime); |
c3eddb2e | 2858 | |
a67ba386 | 2859 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier_priv->num_captures); |
b01155ba FD |
2860 | } |
2861 | } | |
2862 | ||
1ec3f75a | 2863 | /* |
d83004aa JD |
2864 | * Serialize at most one packet worth of metadata into a metadata |
2865 | * channel. | |
92d9f5e6 MD |
2866 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2867 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2868 | * allows us to do racy operations such as looking for remaining space left in | |
2869 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2870 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2871 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2872 | * Returns the number of bytes written in the channel, 0 if no data |
2873 | * was written and a negative value on error. | |
1ec3f75a | 2874 | */ |
b3b8072b | 2875 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2876 | struct channel *chan, bool *coherent) |
d83004aa JD |
2877 | { |
2878 | struct lib_ring_buffer_ctx ctx; | |
2879 | int ret = 0; | |
2880 | size_t len, reserve_len; | |
2881 | ||
f613e3e6 | 2882 | /* |
92d9f5e6 MD |
2883 | * Ensure we support mutiple get_next / put sequences followed by |
2884 | * put_next. The metadata cache lock protects reading the metadata | |
2885 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2886 | * "flush" operations on the buffer invoked by different processes. | |
2887 | * Moreover, since the metadata cache memory can be reallocated, we | |
2888 | * need to have exclusive access against updates even though we only | |
2889 | * read it. | |
f613e3e6 | 2890 | */ |
92d9f5e6 | 2891 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2892 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2893 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2894 | goto end; |
f613e3e6 | 2895 | |
9616f0bf JD |
2896 | /* Metadata regenerated, change the version. */ |
2897 | if (stream->metadata_cache->version != stream->version) | |
2898 | stream->version = stream->metadata_cache->version; | |
2899 | ||
d83004aa | 2900 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2901 | stream->metadata_in; |
9de2c215 | 2902 | if (!len) |
de23d59d | 2903 | goto end; |
d83004aa | 2904 | reserve_len = min_t(size_t, |
b3b8072b | 2905 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2906 | len); |
b3b8072b | 2907 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2908 | sizeof(char), -1); |
2909 | /* | |
2910 | * If reservation failed, return an error to the caller. | |
2911 | */ | |
b3b8072b | 2912 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2913 | if (ret != 0) { |
2914 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2915 | stream->coherent = false; |
d83004aa JD |
2916 | goto end; |
2917 | } | |
b3b8072b | 2918 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2919 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2920 | reserve_len); |
b3b8072b | 2921 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2922 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2923 | if (reserve_len < len) |
8b97fd42 MD |
2924 | stream->coherent = false; |
2925 | else | |
2926 | stream->coherent = true; | |
d83004aa JD |
2927 | ret = reserve_len; |
2928 | ||
2929 | end: | |
8b97fd42 MD |
2930 | if (coherent) |
2931 | *coherent = stream->coherent; | |
92d9f5e6 | 2932 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2933 | return ret; |
2934 | } | |
2935 | ||
8b97fd42 MD |
2936 | static |
2937 | void lttng_metadata_begin(struct lttng_session *session) | |
2938 | { | |
3e75e2a7 MD |
2939 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2940 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2941 | } |
2942 | ||
2943 | static | |
2944 | void lttng_metadata_end(struct lttng_session *session) | |
2945 | { | |
3e75e2a7 MD |
2946 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2947 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2948 | struct lttng_metadata_stream *stream; | |
2949 | ||
3e75e2a7 MD |
2950 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2951 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2952 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2953 | } |
8b97fd42 MD |
2954 | } |
2955 | ||
d83004aa JD |
2956 | /* |
2957 | * Write the metadata to the metadata cache. | |
2958 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2959 | * The metadata cache lock protects us from concurrent read access from |
2960 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2961 | * The content of the printf is printed as a single atomic metadata |
2962 | * transaction. | |
d83004aa | 2963 | */ |
a90917c3 | 2964 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2965 | const char *fmt, ...) |
2966 | { | |
c099397a | 2967 | char *str; |
d83004aa | 2968 | size_t len; |
c099397a MD |
2969 | va_list ap; |
2970 | ||
585e5dcc | 2971 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2972 | |
2973 | va_start(ap, fmt); | |
2974 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2975 | va_end(ap); | |
2976 | if (!str) | |
2977 | return -ENOMEM; | |
2978 | ||
1ec3f75a | 2979 | len = strlen(str); |
3e75e2a7 | 2980 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2981 | if (session->metadata_cache->metadata_written + len > |
2982 | session->metadata_cache->cache_alloc) { | |
2983 | char *tmp_cache_realloc; | |
2984 | unsigned int tmp_cache_alloc_size; | |
2985 | ||
2986 | tmp_cache_alloc_size = max_t(unsigned int, | |
2987 | session->metadata_cache->cache_alloc + len, | |
2988 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2989 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2990 | if (!tmp_cache_realloc) |
2991 | goto err; | |
a606b6e8 ML |
2992 | if (session->metadata_cache->data) { |
2993 | memcpy(tmp_cache_realloc, | |
2994 | session->metadata_cache->data, | |
2995 | session->metadata_cache->cache_alloc); | |
2996 | vfree(session->metadata_cache->data); | |
2997 | } | |
2998 | ||
d83004aa JD |
2999 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3000 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3001 | } |
d83004aa JD |
3002 | memcpy(session->metadata_cache->data + |
3003 | session->metadata_cache->metadata_written, | |
3004 | str, len); | |
3005 | session->metadata_cache->metadata_written += len; | |
c099397a | 3006 | kfree(str); |
d83004aa | 3007 | |
d83004aa JD |
3008 | return 0; |
3009 | ||
3010 | err: | |
3011 | kfree(str); | |
3012 | return -ENOMEM; | |
c099397a MD |
3013 | } |
3014 | ||
f513b2bf MD |
3015 | static |
3016 | int print_tabs(struct lttng_session *session, size_t nesting) | |
3017 | { | |
3018 | size_t i; | |
3019 | ||
3020 | for (i = 0; i < nesting; i++) { | |
3021 | int ret; | |
3022 | ||
3023 | ret = lttng_metadata_printf(session, " "); | |
3024 | if (ret) { | |
3025 | return ret; | |
3026 | } | |
3027 | } | |
3028 | return 0; | |
3029 | } | |
3030 | ||
ceabb767 MD |
3031 | static |
3032 | int lttng_field_name_statedump(struct lttng_session *session, | |
437d5aa5 | 3033 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3034 | size_t nesting) |
3035 | { | |
3036 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3037 | } | |
3038 | ||
3039 | static | |
3040 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3041 | const struct lttng_kernel_type_integer *type, |
3042 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3043 | size_t nesting) |
3044 | { | |
3045 | int ret; | |
3046 | ||
ceabb767 MD |
3047 | ret = print_tabs(session, nesting); |
3048 | if (ret) | |
3049 | return ret; | |
3050 | ret = lttng_metadata_printf(session, | |
3051 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3052 | type->size, |
3053 | type->alignment, | |
3054 | type->signedness, | |
3055 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3056 | ? "none" |
437d5aa5 | 3057 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3058 | ? "UTF8" |
3059 | : "ASCII", | |
437d5aa5 | 3060 | type->base, |
ceabb767 | 3061 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3062 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3063 | #else |
437d5aa5 | 3064 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3065 | #endif |
3066 | ); | |
3067 | return ret; | |
3068 | } | |
3069 | ||
f513b2bf MD |
3070 | /* |
3071 | * Must be called with sessions_mutex held. | |
3072 | */ | |
3073 | static | |
3074 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3075 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3076 | size_t nesting) |
3077 | { | |
3078 | int ret; | |
3079 | uint32_t i, nr_fields; | |
ceabb767 MD |
3080 | unsigned int alignment; |
3081 | ||
f513b2bf MD |
3082 | ret = print_tabs(session, nesting); |
3083 | if (ret) | |
3084 | return ret; | |
3085 | ret = lttng_metadata_printf(session, | |
3086 | "struct {\n"); | |
3087 | if (ret) | |
3088 | return ret; | |
437d5aa5 | 3089 | nr_fields = type->nr_fields; |
f513b2bf | 3090 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3091 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3092 | |
437d5aa5 | 3093 | iter_field = type->fields[i]; |
f513b2bf MD |
3094 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3095 | if (ret) | |
3096 | return ret; | |
3097 | } | |
3098 | ret = print_tabs(session, nesting); | |
3099 | if (ret) | |
3100 | return ret; | |
437d5aa5 | 3101 | alignment = type->alignment; |
ceabb767 MD |
3102 | if (alignment) { |
3103 | ret = lttng_metadata_printf(session, | |
3104 | "} align(%u)", | |
3105 | alignment); | |
3106 | } else { | |
3107 | ret = lttng_metadata_printf(session, | |
3108 | "}"); | |
3109 | } | |
f513b2bf MD |
3110 | return ret; |
3111 | } | |
3112 | ||
3113 | /* | |
3114 | * Must be called with sessions_mutex held. | |
3115 | */ | |
3116 | static | |
ceabb767 | 3117 | int _lttng_struct_field_statedump(struct lttng_session *session, |
437d5aa5 | 3118 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3119 | size_t nesting) |
3120 | { | |
3121 | int ret; | |
3122 | ||
3123 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3124 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3125 | if (ret) |
3126 | return ret; | |
ceabb767 | 3127 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3128 | } |
3129 | ||
65c85aa6 MD |
3130 | /* |
3131 | * Must be called with sessions_mutex held. | |
3132 | */ | |
3133 | static | |
3134 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3135 | const struct lttng_kernel_type_variant *type, |
65c85aa6 MD |
3136 | size_t nesting) |
3137 | { | |
3138 | int ret; | |
3139 | uint32_t i, nr_choices; | |
3140 | ||
ceabb767 MD |
3141 | /* |
3142 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3143 | */ | |
437d5aa5 | 3144 | if (type->alignment != 0) |
ceabb767 | 3145 | return -EINVAL; |
65c85aa6 MD |
3146 | ret = print_tabs(session, nesting); |
3147 | if (ret) | |
3148 | return ret; | |
3149 | ret = lttng_metadata_printf(session, | |
3150 | "variant <_%s> {\n", | |
437d5aa5 | 3151 | type->tag_name); |
65c85aa6 MD |
3152 | if (ret) |
3153 | return ret; | |
437d5aa5 | 3154 | nr_choices = type->nr_choices; |
65c85aa6 | 3155 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3156 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3157 | |
437d5aa5 | 3158 | iter_field = type->choices[i]; |
65c85aa6 MD |
3159 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3160 | if (ret) | |
3161 | return ret; | |
3162 | } | |
3163 | ret = print_tabs(session, nesting); | |
3164 | if (ret) | |
3165 | return ret; | |
3166 | ret = lttng_metadata_printf(session, | |
3167 | "}"); | |
3168 | return ret; | |
3169 | } | |
3170 | ||
3171 | /* | |
3172 | * Must be called with sessions_mutex held. | |
3173 | */ | |
3174 | static | |
ceabb767 | 3175 | int _lttng_variant_field_statedump(struct lttng_session *session, |
437d5aa5 | 3176 | const struct lttng_kernel_event_field *field, |
65c85aa6 MD |
3177 | size_t nesting) |
3178 | { | |
3179 | int ret; | |
3180 | ||
3181 | ret = _lttng_variant_type_statedump(session, | |
437d5aa5 | 3182 | lttng_kernel_get_type_variant(field->type), nesting); |
65c85aa6 MD |
3183 | if (ret) |
3184 | return ret; | |
ceabb767 | 3185 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3186 | } |
3187 | ||
f513b2bf MD |
3188 | /* |
3189 | * Must be called with sessions_mutex held. | |
3190 | */ | |
3191 | static | |
ceabb767 | 3192 | int _lttng_array_field_statedump(struct lttng_session *session, |
437d5aa5 | 3193 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3194 | size_t nesting) |
3195 | { | |
3196 | int ret; | |
437d5aa5 MD |
3197 | const struct lttng_kernel_type_array *array_type; |
3198 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3199 | |
437d5aa5 MD |
3200 | array_type = lttng_kernel_get_type_array(field->type); |
3201 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3202 | |
437d5aa5 | 3203 | if (array_type->alignment) { |
ceabb767 | 3204 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3205 | if (ret) |
3206 | return ret; | |
ceabb767 MD |
3207 | ret = lttng_metadata_printf(session, |
3208 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3209 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3210 | field->name); |
3211 | if (ret) | |
3212 | return ret; | |
3213 | } | |
3214 | /* | |
3215 | * Nested compound types: Only array of structures and variants are | |
3216 | * currently supported. | |
3217 | */ | |
437d5aa5 | 3218 | elem_type = array_type->elem_type; |
12bb2edb MD |
3219 | switch (elem_type->type) { |
3220 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3221 | case lttng_kernel_type_struct: |
3222 | case lttng_kernel_type_variant: | |
3223 | ret = _lttng_type_statedump(session, elem_type, | |
3224 | array_type->encoding, nesting); | |
65c85aa6 MD |
3225 | if (ret) |
3226 | return ret; | |
3227 | break; | |
ceabb767 | 3228 | |
f513b2bf MD |
3229 | default: |
3230 | return -EINVAL; | |
3231 | } | |
3232 | ret = lttng_metadata_printf(session, | |
3233 | " _%s[%u];\n", | |
3234 | field->name, | |
437d5aa5 | 3235 | array_type->length); |
f513b2bf MD |
3236 | return ret; |
3237 | } | |
3238 | ||
3239 | /* | |
3240 | * Must be called with sessions_mutex held. | |
3241 | */ | |
3242 | static | |
ceabb767 | 3243 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
437d5aa5 | 3244 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3245 | size_t nesting) |
3246 | { | |
3247 | int ret; | |
3248 | const char *length_name; | |
437d5aa5 MD |
3249 | const struct lttng_kernel_type_sequence *sequence_type; |
3250 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3251 | |
437d5aa5 MD |
3252 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3253 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3254 | |
437d5aa5 | 3255 | length_name = sequence_type->length_name; |
ceabb767 | 3256 | |
437d5aa5 | 3257 | if (sequence_type->alignment) { |
ceabb767 | 3258 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3259 | if (ret) |
3260 | return ret; | |
ceabb767 MD |
3261 | ret = lttng_metadata_printf(session, |
3262 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3263 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3264 | field->name); |
3265 | if (ret) | |
3266 | return ret; | |
3267 | } | |
3268 | ||
3269 | /* | |
3270 | * Nested compound types: Only array of structures and variants are | |
3271 | * currently supported. | |
3272 | */ | |
437d5aa5 | 3273 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3274 | switch (elem_type->type) { |
3275 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3276 | case lttng_kernel_type_struct: |
3277 | case lttng_kernel_type_variant: | |
3278 | ret = _lttng_type_statedump(session, elem_type, | |
3279 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3280 | if (ret) |
3281 | return ret; | |
3282 | break; | |
ceabb767 | 3283 | |
f513b2bf MD |
3284 | default: |
3285 | return -EINVAL; | |
3286 | } | |
3287 | ret = lttng_metadata_printf(session, | |
3288 | " _%s[ _%s ];\n", | |
3289 | field->name, | |
437d5aa5 | 3290 | sequence_type->length_name); |
f513b2bf MD |
3291 | return ret; |
3292 | } | |
3293 | ||
141ddf28 MD |
3294 | /* |
3295 | * Must be called with sessions_mutex held. | |
3296 | */ | |
3297 | static | |
ceabb767 | 3298 | int _lttng_enum_type_statedump(struct lttng_session *session, |
437d5aa5 | 3299 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3300 | size_t nesting) |
3301 | { | |
d96a4a7a | 3302 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3303 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3304 | int ret; |
3305 | unsigned int i, nr_entries; | |
3306 | ||
437d5aa5 | 3307 | container_type = type->container_type; |
12bb2edb | 3308 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3309 | ret = -EINVAL; |
3310 | goto end; | |
3311 | } | |
437d5aa5 | 3312 | enum_desc = type->desc; |
141ddf28 MD |
3313 | nr_entries = enum_desc->nr_entries; |
3314 | ||
3315 | ret = print_tabs(session, nesting); | |
3316 | if (ret) | |
3317 | goto end; | |
ceabb767 MD |
3318 | ret = lttng_metadata_printf(session, "enum : "); |
3319 | if (ret) | |
3320 | goto end; | |
437d5aa5 MD |
3321 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3322 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3323 | if (ret) |
ceabb767 MD |
3324 | goto end; |
3325 | ret = lttng_metadata_printf(session, " {\n"); | |
3326 | if (ret) | |
3327 | goto end; | |
141ddf28 MD |
3328 | /* Dump all entries */ |
3329 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3330 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3331 | int j, len; |
3332 | ||
3333 | ret = print_tabs(session, nesting + 1); | |
3334 | if (ret) | |
3335 | goto end; | |
3336 | ret = lttng_metadata_printf(session, | |
3337 | "\""); | |
3338 | if (ret) | |
3339 | goto end; | |
3340 | len = strlen(entry->string); | |
3341 | /* Escape the character '"' */ | |
3342 | for (j = 0; j < len; j++) { | |
3343 | char c = entry->string[j]; | |
3344 | ||
3345 | switch (c) { | |
3346 | case '"': | |
3347 | ret = lttng_metadata_printf(session, | |
3348 | "\\\""); | |
3349 | break; | |
3350 | case '\\': | |
3351 | ret = lttng_metadata_printf(session, | |
3352 | "\\\\"); | |
3353 | break; | |
3354 | default: | |
3355 | ret = lttng_metadata_printf(session, | |
3356 | "%c", c); | |
3357 | break; | |
3358 | } | |
3359 | if (ret) | |
3360 | goto end; | |
3361 | } | |
08ad1061 PP |
3362 | ret = lttng_metadata_printf(session, "\""); |
3363 | if (ret) | |
3364 | goto end; | |
3365 | ||
3366 | if (entry->options.is_auto) { | |
3367 | ret = lttng_metadata_printf(session, ",\n"); | |
3368 | if (ret) | |
3369 | goto end; | |
141ddf28 | 3370 | } else { |
7c559490 MD |
3371 | ret = lttng_metadata_printf(session, |
3372 | " = "); | |
3373 | if (ret) | |
3374 | goto end; | |
3375 | if (entry->start.signedness) | |
141ddf28 | 3376 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3377 | "%lld", (long long) entry->start.value); |
3378 | else | |
3379 | ret = lttng_metadata_printf(session, | |
3380 | "%llu", entry->start.value); | |
3381 | if (ret) | |
3382 | goto end; | |
3383 | if (entry->start.signedness == entry->end.signedness && | |
3384 | entry->start.value | |
3385 | == entry->end.value) { | |
141ddf28 | 3386 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3387 | ",\n"); |
3388 | } else { | |
3389 | if (entry->end.signedness) { | |
3390 | ret = lttng_metadata_printf(session, | |
3391 | " ... %lld,\n", | |
3392 | (long long) entry->end.value); | |
3393 | } else { | |
3394 | ret = lttng_metadata_printf(session, | |
3395 | " ... %llu,\n", | |
3396 | entry->end.value); | |
3397 | } | |
141ddf28 | 3398 | } |
7c559490 MD |
3399 | if (ret) |
3400 | goto end; | |
141ddf28 | 3401 | } |
141ddf28 MD |
3402 | } |
3403 | ret = print_tabs(session, nesting); | |
3404 | if (ret) | |
3405 | goto end; | |
ceabb767 | 3406 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3407 | end: |
3408 | return ret; | |
3409 | } | |
3410 | ||
d83004aa JD |
3411 | /* |
3412 | * Must be called with sessions_mutex held. | |
3413 | */ | |
c099397a | 3414 | static |
ceabb767 | 3415 | int _lttng_enum_field_statedump(struct lttng_session *session, |
437d5aa5 | 3416 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3417 | size_t nesting) |
3418 | { | |
3419 | int ret; | |
437d5aa5 | 3420 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3421 | |
437d5aa5 MD |
3422 | enum_type = lttng_kernel_get_type_enum(field->type); |
3423 | WARN_ON_ONCE(!enum_type); | |
3424 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3425 | if (ret) |
3426 | return ret; | |
3427 | return lttng_field_name_statedump(session, field, nesting); | |
3428 | } | |
3429 | ||
3430 | static | |
3431 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3432 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3433 | size_t nesting) |
3434 | { | |
3435 | int ret; | |
3436 | ||
437d5aa5 MD |
3437 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3438 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3439 | if (ret) |
3440 | return ret; | |
3441 | return lttng_field_name_statedump(session, field, nesting); | |
3442 | } | |
3443 | ||
3444 | static | |
3445 | int _lttng_string_type_statedump(struct lttng_session *session, | |
437d5aa5 | 3446 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3447 | size_t nesting) |
3448 | { | |
3449 | int ret; | |
3450 | ||
ceabb767 MD |
3451 | /* Default encoding is UTF8 */ |
3452 | ret = print_tabs(session, nesting); | |
3453 | if (ret) | |
3454 | return ret; | |
3455 | ret = lttng_metadata_printf(session, | |
3456 | "string%s", | |
437d5aa5 | 3457 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3458 | " { encoding = ASCII; }" : ""); |
3459 | return ret; | |
3460 | } | |
3461 | ||
3462 | static | |
3463 | int _lttng_string_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3464 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3465 | size_t nesting) |
ceabb767 | 3466 | { |
437d5aa5 | 3467 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3468 | int ret; |
3469 | ||
437d5aa5 MD |
3470 | string_type = lttng_kernel_get_type_string(field->type); |
3471 | WARN_ON_ONCE(!string_type); | |
3472 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3473 | if (ret) |
3474 | return ret; | |
3475 | return lttng_field_name_statedump(session, field, nesting); | |
3476 | } | |
3477 | ||
3478 | /* | |
3479 | * Must be called with sessions_mutex held. | |
3480 | */ | |
3481 | static | |
3482 | int _lttng_type_statedump(struct lttng_session *session, | |
437d5aa5 MD |
3483 | const struct lttng_kernel_type_common *type, |
3484 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3485 | size_t nesting) |
c099397a | 3486 | { |
c099397a | 3487 | int ret = 0; |
c099397a | 3488 | |
12bb2edb MD |
3489 | switch (type->type) { |
3490 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3491 | ret = _lttng_integer_type_statedump(session, |
3492 | lttng_kernel_get_type_integer(type), | |
3493 | parent_encoding, nesting); | |
8070f5c0 | 3494 | break; |
437d5aa5 MD |
3495 | case lttng_kernel_type_enum: |
3496 | ret = _lttng_enum_type_statedump(session, | |
3497 | lttng_kernel_get_type_enum(type), | |
3498 | nesting); | |
8070f5c0 | 3499 | break; |
12bb2edb | 3500 | case lttng_kernel_type_string: |
437d5aa5 MD |
3501 | ret = _lttng_string_type_statedump(session, |
3502 | lttng_kernel_get_type_string(type), | |
3503 | nesting); | |
ceabb767 | 3504 | break; |
437d5aa5 MD |
3505 | case lttng_kernel_type_struct: |
3506 | ret = _lttng_struct_type_statedump(session, | |
3507 | lttng_kernel_get_type_struct(type), | |
3508 | nesting); | |
8070f5c0 | 3509 | break; |
437d5aa5 MD |
3510 | case lttng_kernel_type_variant: |
3511 | ret = _lttng_variant_type_statedump(session, | |
3512 | lttng_kernel_get_type_variant(type), | |
3513 | nesting); | |
ceabb767 MD |
3514 | break; |
3515 | ||
3516 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3517 | case lttng_kernel_type_array: |
3518 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3519 | default: |
3520 | WARN_ON_ONCE(1); | |
3521 | return -EINVAL; | |
8070f5c0 | 3522 | } |
ceabb767 MD |
3523 | return ret; |
3524 | } | |
8070f5c0 | 3525 | |
ceabb767 MD |
3526 | /* |
3527 | * Must be called with sessions_mutex held. | |
3528 | */ | |
3529 | static | |
3530 | int _lttng_field_statedump(struct lttng_session *session, | |
437d5aa5 | 3531 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3532 | size_t nesting) |
3533 | { | |
3534 | int ret = 0; | |
27d2368e | 3535 | |
437d5aa5 | 3536 | switch (field->type->type) { |
12bb2edb | 3537 | case lttng_kernel_type_integer: |
ceabb767 MD |
3538 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3539 | break; | |
437d5aa5 | 3540 | case lttng_kernel_type_enum: |
ceabb767 | 3541 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3542 | break; |
12bb2edb | 3543 | case lttng_kernel_type_string: |
ceabb767 | 3544 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3545 | break; |
437d5aa5 | 3546 | case lttng_kernel_type_struct: |
ceabb767 | 3547 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3548 | break; |
437d5aa5 | 3549 | case lttng_kernel_type_array: |
ceabb767 | 3550 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3551 | break; |
437d5aa5 | 3552 | case lttng_kernel_type_sequence: |
ceabb767 | 3553 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3554 | break; |
437d5aa5 | 3555 | case lttng_kernel_type_variant: |
ceabb767 | 3556 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3557 | break; |
f513b2bf | 3558 | |
8070f5c0 MD |
3559 | default: |
3560 | WARN_ON_ONCE(1); | |
3561 | return -EINVAL; | |
3562 | } | |
3563 | return ret; | |
3564 | } | |
3565 | ||
3566 | static | |
a90917c3 | 3567 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
437d5aa5 | 3568 | struct lttng_kernel_ctx *ctx) |
8070f5c0 MD |
3569 | { |
3570 | int ret = 0; | |
3571 | int i; | |
3572 | ||
3573 | if (!ctx) | |
3574 | return 0; | |
3575 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3576 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3577 | |
437d5aa5 | 3578 | ret = _lttng_field_statedump(session, field->event_field, 2); |
8070f5c0 MD |
3579 | if (ret) |
3580 | return ret; | |
3581 | } | |
3582 | return ret; | |
3583 | } | |
3584 | ||
3585 | static | |
a90917c3 | 3586 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
a67ba386 | 3587 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3588 | { |
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 | |
f513b2bf | 3596 | ret = _lttng_field_statedump(session, field, 2); |
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); |