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 | |
8cdc1a81 MD |
66 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
67 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 68 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 69 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 70 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
a90917c3 | 73 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
a67ba386 MD |
74 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
75 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 76 | static |
8cdc1a81 | 77 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
a90917c3 | 78 | struct lttng_channel *chan, |
a67ba386 | 79 | struct lttng_kernel_event_recorder *event); |
c099397a | 80 | static |
8cdc1a81 | 81 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
8cdc1a81 | 85 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
86 | const struct lttng_kernel_type_common *type, |
87 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
88 | size_t nesting); |
89 | static | |
8cdc1a81 | 90 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 91 | const struct lttng_kernel_event_field *field, |
51ef4536 | 92 | size_t nesting, const char **prev_field_name_p); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
5f4c791e | 96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
97 | synchronize_rcu(); |
98 | #else | |
abcca994 | 99 | synchronize_sched(); |
92da05ce MJ |
100 | #endif |
101 | ||
5f4c791e | 102 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
103 | #ifdef CONFIG_PREEMPT_RT_FULL |
104 | synchronize_rcu(); | |
105 | #endif | |
5f4c791e | 106 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | #ifdef CONFIG_PREEMPT_RT |
108 | synchronize_rcu(); | |
109 | #endif | |
5f4c791e | 110 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
111 | } |
112 | ||
3c997079 MD |
113 | void lttng_lock_sessions(void) |
114 | { | |
115 | mutex_lock(&sessions_mutex); | |
116 | } | |
117 | ||
118 | void lttng_unlock_sessions(void) | |
119 | { | |
120 | mutex_unlock(&sessions_mutex); | |
121 | } | |
122 | ||
9fe593d2 FD |
123 | static struct lttng_transport *lttng_transport_find(const char *name) |
124 | { | |
125 | struct lttng_transport *transport; | |
126 | ||
127 | list_for_each_entry(transport, <tng_transport_list, node) { | |
128 | if (!strcmp(transport->name, name)) | |
129 | return transport; | |
130 | } | |
131 | return NULL; | |
132 | } | |
133 | ||
3c997079 MD |
134 | /* |
135 | * Called with sessions lock held. | |
136 | */ | |
137 | int lttng_session_active(void) | |
138 | { | |
8cdc1a81 | 139 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
140 | |
141 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 142 | if (iter->pub->active) |
3c997079 MD |
143 | return 1; |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
8cdc1a81 | 148 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 149 | { |
8cdc1a81 MD |
150 | struct lttng_kernel_session *session; |
151 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 152 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 153 | int i; |
4e3c1b9b MD |
154 | |
155 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 156 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 157 | if (!session) |
d83004aa | 158 | goto err; |
8cdc1a81 MD |
159 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
160 | if (!session_priv) | |
161 | goto err_free_session; | |
162 | session->priv = session_priv; | |
163 | session_priv->pub = session; | |
164 | ||
165 | INIT_LIST_HEAD(&session_priv->chan); | |
166 | INIT_LIST_HEAD(&session_priv->events); | |
167 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
168 | |
169 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
170 | GFP_KERNEL); | |
171 | if (!metadata_cache) | |
8cdc1a81 | 172 | goto err_free_session_private; |
0ca42eb7 | 173 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
174 | if (!metadata_cache->data) |
175 | goto err_free_cache; | |
176 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
177 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 178 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 179 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 180 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 181 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 182 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 183 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 184 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
185 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
186 | list_add(&session_priv->list, &sessions); | |
187 | ||
d1f652f8 MD |
188 | session->pid_tracker.session = session; |
189 | session->pid_tracker.tracker_type = TRACKER_PID; | |
190 | session->vpid_tracker.session = session; | |
191 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
192 | session->uid_tracker.session = session; | |
193 | session->uid_tracker.tracker_type = TRACKER_UID; | |
194 | session->vuid_tracker.session = session; | |
195 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
196 | session->gid_tracker.session = session; | |
197 | session->gid_tracker.tracker_type = TRACKER_GID; | |
198 | session->vgid_tracker.session = session; | |
199 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b | 200 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 201 | |
4e3c1b9b | 202 | return session; |
d83004aa JD |
203 | |
204 | err_free_cache: | |
205 | kfree(metadata_cache); | |
8cdc1a81 MD |
206 | err_free_session_private: |
207 | lttng_kvfree(session_priv); | |
d83004aa | 208 | err_free_session: |
48f5e0b5 | 209 | lttng_kvfree(session); |
d83004aa JD |
210 | err: |
211 | mutex_unlock(&sessions_mutex); | |
212 | return NULL; | |
213 | } | |
214 | ||
99f52fcc FD |
215 | static |
216 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
217 | { | |
218 | struct lttng_counter_transport *transport; | |
219 | ||
220 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
221 | if (!strcmp(transport->name, name)) | |
222 | return transport; | |
223 | } | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | struct lttng_counter *lttng_kernel_counter_create( | |
228 | const char *counter_transport_name, | |
229 | size_t number_dimensions, const size_t *dimensions_sizes) | |
230 | { | |
231 | struct lttng_counter *counter = NULL; | |
232 | struct lttng_counter_transport *counter_transport = NULL; | |
233 | ||
234 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
235 | if (!counter_transport) { | |
236 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
237 | counter_transport_name); | |
238 | goto notransport; | |
239 | } | |
240 | if (!try_module_get(counter_transport->owner)) { | |
241 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
242 | goto notransport; | |
243 | } | |
244 | ||
245 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
246 | if (!counter) | |
247 | goto nomem; | |
248 | ||
249 | /* Create event notifier error counter. */ | |
250 | counter->ops = &counter_transport->ops; | |
251 | counter->transport = counter_transport; | |
252 | ||
253 | counter->counter = counter->ops->counter_create( | |
254 | number_dimensions, dimensions_sizes, 0); | |
255 | if (!counter->counter) { | |
256 | goto create_error; | |
257 | } | |
258 | ||
259 | return counter; | |
260 | ||
261 | create_error: | |
262 | lttng_kvfree(counter); | |
263 | nomem: | |
264 | if (counter_transport) | |
265 | module_put(counter_transport->owner); | |
266 | notransport: | |
267 | return NULL; | |
268 | } | |
269 | ||
750b05f2 FD |
270 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
271 | { | |
272 | struct lttng_transport *transport = NULL; | |
273 | struct lttng_event_notifier_group *event_notifier_group; | |
274 | const char *transport_name = "relay-event-notifier"; | |
275 | size_t subbuf_size = 4096; //TODO | |
276 | size_t num_subbuf = 16; //TODO | |
277 | unsigned int switch_timer_interval = 0; | |
278 | unsigned int read_timer_interval = 0; | |
dffef45d | 279 | int i; |
750b05f2 FD |
280 | |
281 | mutex_lock(&sessions_mutex); | |
282 | ||
283 | transport = lttng_transport_find(transport_name); | |
284 | if (!transport) { | |
285 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
286 | transport_name); | |
287 | goto notransport; | |
288 | } | |
289 | if (!try_module_get(transport->owner)) { | |
290 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
291 | transport_name); | |
292 | goto notransport; | |
293 | } | |
294 | ||
295 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
296 | GFP_KERNEL); | |
297 | if (!event_notifier_group) | |
298 | goto nomem; | |
299 | ||
300 | /* | |
301 | * Initialize the ring buffer used to store event notifier | |
302 | * notifications. | |
303 | */ | |
304 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 305 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
306 | transport_name, event_notifier_group, NULL, |
307 | subbuf_size, num_subbuf, switch_timer_interval, | |
308 | read_timer_interval); | |
309 | if (!event_notifier_group->chan) | |
310 | goto create_error; | |
311 | ||
312 | event_notifier_group->transport = transport; | |
dffef45d FD |
313 | |
314 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
315 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
316 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
317 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
318 | ||
750b05f2 FD |
319 | list_add(&event_notifier_group->node, &event_notifier_groups); |
320 | ||
321 | mutex_unlock(&sessions_mutex); | |
322 | ||
323 | return event_notifier_group; | |
324 | ||
325 | create_error: | |
326 | lttng_kvfree(event_notifier_group); | |
327 | nomem: | |
328 | if (transport) | |
329 | module_put(transport->owner); | |
330 | notransport: | |
331 | mutex_unlock(&sessions_mutex); | |
332 | return NULL; | |
333 | } | |
334 | ||
d83004aa JD |
335 | void metadata_cache_destroy(struct kref *kref) |
336 | { | |
337 | struct lttng_metadata_cache *cache = | |
338 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 339 | vfree(cache->data); |
d83004aa | 340 | kfree(cache); |
4e3c1b9b MD |
341 | } |
342 | ||
8cdc1a81 | 343 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 344 | { |
a90917c3 | 345 | struct lttng_channel *chan, *tmpchan; |
a67ba386 | 346 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 347 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 348 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 349 | int ret; |
4e3c1b9b MD |
350 | |
351 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 352 | WRITE_ONCE(session->active, 0); |
8cdc1a81 | 353 | list_for_each_entry(chan, &session->priv->chan, list) { |
3b82c4e1 | 354 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
355 | WARN_ON(ret); |
356 | } | |
8cdc1a81 | 357 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 358 | ret = _lttng_event_unregister(event_recorder_priv->pub); |
dda6a249 MD |
359 | WARN_ON(ret); |
360 | } | |
abcca994 | 361 | synchronize_trace(); /* Wait for in-flight events to complete */ |
8cdc1a81 | 362 | list_for_each_entry(chan, &session->priv->chan, list) { |
2d6d88c6 | 363 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
364 | WARN_ON(ret); |
365 | } | |
b2bc0bc8 | 366 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
8cdc1a81 | 367 | &session->priv->enablers_head, node) |
b2bc0bc8 | 368 | lttng_event_enabler_destroy(event_enabler); |
8cdc1a81 | 369 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 370 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
8cdc1a81 | 371 | list_for_each_entry_safe(chan, tmpchan, &session->priv->chan, list) { |
d83004aa | 372 | BUG_ON(chan->channel_type == METADATA_CHANNEL); |
a90917c3 | 373 | _lttng_channel_destroy(chan); |
d83004aa | 374 | } |
8cdc1a81 MD |
375 | mutex_lock(&session->priv->metadata_cache->lock); |
376 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 377 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 378 | mutex_unlock(&session->priv->metadata_cache->lock); |
d1f652f8 MD |
379 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
380 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
381 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
382 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
383 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
384 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
8cdc1a81 MD |
385 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
386 | list_del(&session->priv->list); | |
4e3c1b9b | 387 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 388 | lttng_kvfree(session->priv); |
48f5e0b5 | 389 | lttng_kvfree(session); |
4e3c1b9b MD |
390 | } |
391 | ||
dffef45d FD |
392 | void lttng_event_notifier_group_destroy( |
393 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 394 | { |
dffef45d | 395 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 396 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
397 | int ret; |
398 | ||
750b05f2 FD |
399 | if (!event_notifier_group) |
400 | return; | |
401 | ||
402 | mutex_lock(&sessions_mutex); | |
dffef45d | 403 | |
3b82c4e1 | 404 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
405 | WARN_ON(ret); |
406 | ||
a67ba386 MD |
407 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
408 | &event_notifier_group->event_notifiers_head, node) { | |
409 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
410 | WARN_ON(ret); |
411 | } | |
412 | ||
b01155ba FD |
413 | /* Wait for in-flight event notifier to complete */ |
414 | synchronize_trace(); | |
415 | ||
21f58fb7 FD |
416 | irq_work_sync(&event_notifier_group->wakeup_pending); |
417 | ||
8a8ac9a8 FD |
418 | kfree(event_notifier_group->sc_filter); |
419 | ||
dffef45d FD |
420 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
421 | &event_notifier_group->enablers_head, node) | |
422 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
423 | ||
a67ba386 MD |
424 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
425 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 426 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 427 | |
99f52fcc FD |
428 | if (event_notifier_group->error_counter) { |
429 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 430 | |
99f52fcc FD |
431 | error_counter->ops->counter_destroy(error_counter->counter); |
432 | module_put(error_counter->transport->owner); | |
433 | lttng_kvfree(error_counter); | |
434 | event_notifier_group->error_counter = NULL; | |
435 | } | |
436 | ||
4a399b76 | 437 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
438 | module_put(event_notifier_group->transport->owner); |
439 | list_del(&event_notifier_group->node); | |
dffef45d | 440 | |
750b05f2 FD |
441 | mutex_unlock(&sessions_mutex); |
442 | lttng_kvfree(event_notifier_group); | |
443 | } | |
444 | ||
8cdc1a81 | 445 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
446 | { |
447 | int ret; | |
448 | ||
449 | mutex_lock(&sessions_mutex); | |
450 | ret = lttng_statedump_start(session); | |
451 | mutex_unlock(&sessions_mutex); | |
452 | return ret; | |
453 | } | |
454 | ||
8cdc1a81 | 455 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
456 | { |
457 | int ret = 0; | |
a90917c3 | 458 | struct lttng_channel *chan; |
c0e31d2e MD |
459 | |
460 | mutex_lock(&sessions_mutex); | |
461 | if (session->active) { | |
462 | ret = -EBUSY; | |
463 | goto end; | |
464 | } | |
c099397a | 465 | |
3c997079 | 466 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 467 | session->priv->tstate = 1; |
3c997079 | 468 | |
4ef81e4a | 469 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 470 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 471 | |
c099397a MD |
472 | /* |
473 | * Snapshot the number of events per channel to know the type of header | |
474 | * we need to use. | |
475 | */ | |
8cdc1a81 | 476 | list_for_each_entry(chan, &session->priv->chan, list) { |
c099397a MD |
477 | if (chan->header_type) |
478 | continue; /* don't change it if session stop/restart */ | |
479 | if (chan->free_event_id < 31) | |
480 | chan->header_type = 1; /* compact */ | |
481 | else | |
482 | chan->header_type = 2; /* large */ | |
483 | } | |
484 | ||
64af2437 | 485 | /* Clear each stream's quiescent state. */ |
8cdc1a81 | 486 | list_for_each_entry(chan, &session->priv->chan, list) { |
09b93db9 MD |
487 | if (chan->channel_type != METADATA_CHANNEL) |
488 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
489 | } | |
64af2437 | 490 | |
a8f2d0c7 | 491 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 492 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 493 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 494 | if (ret) { |
a8f2d0c7 | 495 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
496 | goto end; |
497 | } | |
498 | ret = lttng_statedump_start(session); | |
360f38ea | 499 | if (ret) |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
501 | end: |
502 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 503 | return ret; |
c0e31d2e MD |
504 | } |
505 | ||
8cdc1a81 | 506 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
507 | { |
508 | int ret = 0; | |
64af2437 | 509 | struct lttng_channel *chan; |
c0e31d2e MD |
510 | |
511 | mutex_lock(&sessions_mutex); | |
512 | if (!session->active) { | |
513 | ret = -EBUSY; | |
514 | goto end; | |
515 | } | |
a8f2d0c7 | 516 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
517 | |
518 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 519 | session->priv->tstate = 0; |
b2bc0bc8 | 520 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
521 | |
522 | /* Set each stream's quiescent state. */ | |
8cdc1a81 | 523 | list_for_each_entry(chan, &session->priv->chan, list) { |
09b93db9 MD |
524 | if (chan->channel_type != METADATA_CHANNEL) |
525 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
526 | } | |
c0e31d2e MD |
527 | end: |
528 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 529 | return ret; |
c0e31d2e MD |
530 | } |
531 | ||
8cdc1a81 | 532 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
533 | { |
534 | int ret = 0; | |
535 | struct lttng_channel *chan; | |
a67ba386 | 536 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 537 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
538 | struct lttng_metadata_stream *stream; |
539 | ||
540 | mutex_lock(&sessions_mutex); | |
541 | if (!session->active) { | |
542 | ret = -EBUSY; | |
543 | goto end; | |
544 | } | |
545 | ||
546 | mutex_lock(&cache->lock); | |
547 | memset(cache->data, 0, cache->cache_alloc); | |
548 | cache->metadata_written = 0; | |
549 | cache->version++; | |
8cdc1a81 | 550 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
551 | stream->metadata_out = 0; |
552 | stream->metadata_in = 0; | |
553 | } | |
554 | mutex_unlock(&cache->lock); | |
555 | ||
8cdc1a81 MD |
556 | session->priv->metadata_dumped = 0; |
557 | list_for_each_entry(chan, &session->priv->chan, list) { | |
9616f0bf JD |
558 | chan->metadata_dumped = 0; |
559 | } | |
560 | ||
8cdc1a81 | 561 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 562 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
563 | } |
564 | ||
565 | ret = _lttng_session_metadata_statedump(session); | |
566 | ||
567 | end: | |
568 | mutex_unlock(&sessions_mutex); | |
569 | return ret; | |
570 | } | |
571 | ||
a90917c3 | 572 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 573 | { |
3c997079 | 574 | int ret = 0; |
e64957da | 575 | |
3c997079 MD |
576 | mutex_lock(&sessions_mutex); |
577 | if (channel->channel_type == METADATA_CHANNEL) { | |
578 | ret = -EPERM; | |
579 | goto end; | |
580 | } | |
581 | if (channel->enabled) { | |
582 | ret = -EEXIST; | |
583 | goto end; | |
584 | } | |
585 | /* Set transient enabler state to "enabled" */ | |
586 | channel->tstate = 1; | |
b2bc0bc8 | 587 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 588 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 589 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
590 | end: |
591 | mutex_unlock(&sessions_mutex); | |
592 | return ret; | |
e64957da MD |
593 | } |
594 | ||
a90917c3 | 595 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 596 | { |
3c997079 | 597 | int ret = 0; |
e64957da | 598 | |
3c997079 MD |
599 | mutex_lock(&sessions_mutex); |
600 | if (channel->channel_type == METADATA_CHANNEL) { | |
601 | ret = -EPERM; | |
602 | goto end; | |
603 | } | |
604 | if (!channel->enabled) { | |
605 | ret = -EEXIST; | |
606 | goto end; | |
607 | } | |
608 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 609 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
610 | /* Set transient enabler state to "enabled" */ |
611 | channel->tstate = 0; | |
b2bc0bc8 | 612 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
613 | end: |
614 | mutex_unlock(&sessions_mutex); | |
615 | return ret; | |
e64957da MD |
616 | } |
617 | ||
9d993668 | 618 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 619 | { |
3c997079 | 620 | int ret = 0; |
e64957da | 621 | |
3c997079 | 622 | mutex_lock(&sessions_mutex); |
9d993668 MD |
623 | switch (event->type) { |
624 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
625 | { | |
626 | struct lttng_kernel_event_recorder *event_recorder = | |
627 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
628 | ||
629 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
630 | ret = -EPERM; | |
631 | goto end; | |
632 | } | |
a0493bef | 633 | break; |
9d993668 MD |
634 | } |
635 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
636 | switch (event->priv->instrumentation) { | |
637 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
638 | ret = -EINVAL; | |
639 | goto end; | |
640 | default: | |
641 | break; | |
642 | } | |
a0493bef MD |
643 | break; |
644 | default: | |
9d993668 | 645 | break; |
a0493bef | 646 | } |
e64957da | 647 | |
9d993668 | 648 | if (event->enabled) { |
3c997079 MD |
649 | ret = -EEXIST; |
650 | goto end; | |
651 | } | |
a67ba386 | 652 | switch (event->priv->instrumentation) { |
606828e4 MD |
653 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
654 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
655 | ret = -EINVAL; |
656 | break; | |
b4a75708 | 657 | |
606828e4 MD |
658 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
659 | case LTTNG_KERNEL_ABI_UPROBE: | |
9d993668 | 660 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 661 | break; |
b4a75708 | 662 | |
606828e4 | 663 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 664 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 665 | break; |
b4a75708 | 666 | |
606828e4 MD |
667 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
668 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
669 | default: |
670 | WARN_ON_ONCE(1); | |
671 | ret = -EINVAL; | |
672 | } | |
3c997079 MD |
673 | end: |
674 | mutex_unlock(&sessions_mutex); | |
675 | return ret; | |
e64957da MD |
676 | } |
677 | ||
9d993668 | 678 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
679 | { |
680 | int ret = 0; | |
681 | ||
682 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
683 | switch (event->type) { |
684 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
685 | { | |
686 | struct lttng_kernel_event_recorder *event_recorder = | |
687 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
688 | ||
689 | if (event_recorder->chan->channel_type == METADATA_CHANNEL) { | |
690 | ret = -EPERM; | |
691 | goto end; | |
692 | } | |
b01155ba | 693 | break; |
9d993668 MD |
694 | } |
695 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
696 | switch (event->priv->instrumentation) { | |
697 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
698 | ret = -EINVAL; | |
699 | goto end; | |
700 | default: | |
701 | break; | |
702 | } | |
2b16f0c9 | 703 | break; |
dffef45d | 704 | default: |
9d993668 | 705 | break; |
dffef45d | 706 | } |
dffef45d | 707 | |
a67ba386 | 708 | if (!event->enabled) { |
dffef45d FD |
709 | ret = -EEXIST; |
710 | goto end; | |
711 | } | |
a67ba386 | 712 | switch (event->priv->instrumentation) { |
606828e4 MD |
713 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
714 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
715 | ret = -EINVAL; |
716 | break; | |
b4a75708 | 717 | |
606828e4 MD |
718 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
719 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 720 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 721 | break; |
b4a75708 | 722 | |
9d993668 MD |
723 | case LTTNG_KERNEL_ABI_KRETPROBE: |
724 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
725 | break; | |
726 | ||
606828e4 | 727 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 728 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
dffef45d FD |
729 | default: |
730 | WARN_ON_ONCE(1); | |
731 | ret = -EINVAL; | |
732 | } | |
733 | end: | |
734 | mutex_unlock(&sessions_mutex); | |
735 | return ret; | |
736 | } | |
737 | ||
8cdc1a81 | 738 | struct lttng_channel *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
739 | const char *transport_name, |
740 | void *buf_addr, | |
4e3c1b9b MD |
741 | size_t subbuf_size, size_t num_subbuf, |
742 | unsigned int switch_timer_interval, | |
d83004aa JD |
743 | unsigned int read_timer_interval, |
744 | enum channel_type channel_type) | |
4e3c1b9b | 745 | { |
a90917c3 MD |
746 | struct lttng_channel *chan; |
747 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
748 | |
749 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 750 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 751 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 752 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 753 | if (!transport) { |
5a15f70c | 754 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 755 | transport_name); |
c0e31d2e | 756 | goto notransport; |
f3d01b96 | 757 | } |
a33c9927 | 758 | if (!try_module_get(transport->owner)) { |
5a15f70c | 759 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
760 | goto notransport; |
761 | } | |
a90917c3 | 762 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 763 | if (!chan) |
c0e31d2e | 764 | goto nomem; |
4e3c1b9b | 765 | chan->session = session; |
8cdc1a81 | 766 | chan->id = session->priv->free_chan_id++; |
3b731ab1 | 767 | chan->ops = &transport->ops; |
125b4df4 MD |
768 | /* |
769 | * Note: the channel creation op already writes into the packet | |
770 | * headers. Therefore the "chan" information used as input | |
771 | * should be already accessible. | |
772 | */ | |
4a399b76 | 773 | chan->chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
774 | chan, buf_addr, subbuf_size, num_subbuf, |
775 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
776 | if (!chan->chan) |
777 | goto create_error; | |
3c997079 | 778 | chan->tstate = 1; |
e64957da | 779 | chan->enabled = 1; |
a33c9927 | 780 | chan->transport = transport; |
d83004aa | 781 | chan->channel_type = channel_type; |
8cdc1a81 | 782 | list_add(&chan->list, &session->priv->chan); |
4e3c1b9b MD |
783 | mutex_unlock(&sessions_mutex); |
784 | return chan; | |
785 | ||
f3d01b96 MD |
786 | create_error: |
787 | kfree(chan); | |
c0e31d2e | 788 | nomem: |
a33c9927 MD |
789 | if (transport) |
790 | module_put(transport->owner); | |
c0e31d2e | 791 | notransport: |
e5382b6d | 792 | active: |
4e3c1b9b MD |
793 | mutex_unlock(&sessions_mutex); |
794 | return NULL; | |
795 | } | |
796 | ||
797 | /* | |
d83004aa JD |
798 | * Only used internally at session destruction for per-cpu channels, and |
799 | * when metadata channel is released. | |
800 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 801 | */ |
aa7c23a9 | 802 | static |
a90917c3 | 803 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 804 | { |
4a399b76 | 805 | chan->ops->priv->channel_destroy(chan->chan); |
a33c9927 | 806 | module_put(chan->transport->owner); |
4e3c1b9b | 807 | list_del(&chan->list); |
437d5aa5 | 808 | lttng_kernel_destroy_context(chan->ctx); |
4e3c1b9b MD |
809 | kfree(chan); |
810 | } | |
811 | ||
d83004aa JD |
812 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
813 | { | |
814 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
815 | ||
816 | /* Protect the metadata cache with the sessions_mutex. */ | |
817 | mutex_lock(&sessions_mutex); | |
818 | _lttng_channel_destroy(chan); | |
819 | mutex_unlock(&sessions_mutex); | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
822 | ||
823 | static | |
824 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
825 | { | |
826 | stream->finalized = 1; | |
827 | wake_up_interruptible(&stream->read_wait); | |
828 | } | |
829 | ||
a101fa10 | 830 | |
e5382b6d MD |
831 | /* |
832 | * Supports event creation while tracing session is active. | |
3c997079 | 833 | * Needs to be called with sessions mutex held. |
e5382b6d | 834 | */ |
a67ba386 | 835 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 836 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 837 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 838 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 839 | { |
8cdc1a81 | 840 | struct lttng_kernel_session *session = chan->session; |
a67ba386 MD |
841 | struct lttng_kernel_event_recorder *event_recorder; |
842 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
843 | const char *event_name; |
844 | struct hlist_head *head; | |
3d084699 | 845 | int ret; |
4e3c1b9b | 846 | |
abc0446a | 847 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 848 | ret = -EMFILE; |
e5382b6d | 849 | goto full; |
abc0446a | 850 | } |
3c997079 MD |
851 | |
852 | switch (itype) { | |
606828e4 | 853 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 854 | event_name = event_desc->event_name; |
3c997079 | 855 | break; |
b4a75708 | 856 | |
606828e4 MD |
857 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
858 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
859 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
860 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
861 | event_name = event_param->name; |
862 | break; | |
b4a75708 | 863 | |
606828e4 MD |
864 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
865 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
866 | default: |
867 | WARN_ON_ONCE(1); | |
868 | ret = -EINVAL; | |
869 | goto type_error; | |
870 | } | |
4a11ef1c | 871 | |
8cdc1a81 | 872 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 873 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
874 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
875 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
876 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 877 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 878 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
879 | ret = -EEXIST; |
880 | goto exist; | |
abc0446a MD |
881 | } |
882 | } | |
3c997079 | 883 | |
a67ba386 MD |
884 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
885 | if (!event_recorder) { | |
4cf0bf51 | 886 | ret = -ENOMEM; |
4e3c1b9b | 887 | goto cache_error; |
abc0446a | 888 | } |
a67ba386 MD |
889 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
890 | if (!event_recorder_priv) { | |
891 | ret = -ENOMEM; | |
892 | goto cache_private_error; | |
893 | } | |
894 | event_recorder_priv->pub = event_recorder; | |
895 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
896 | event_recorder->priv = event_recorder_priv; | |
897 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
898 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
899 | ||
8a445457 | 900 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 MD |
901 | event_recorder->chan = chan; |
902 | event_recorder->priv->id = chan->free_event_id++; | |
903 | event_recorder->priv->parent.instrumentation = itype; | |
904 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
905 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
906 | |
907 | switch (itype) { | |
606828e4 | 908 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 909 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
910 | event_recorder->parent.enabled = 0; |
911 | event_recorder->priv->parent.registered = 0; | |
912 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
913 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 914 | ret = -ENOENT; |
d3dbe23c | 915 | goto register_error; |
abc0446a | 916 | } |
3c997079 MD |
917 | /* Populate lttng_event structure before event registration. */ |
918 | smp_wmb(); | |
baf20995 | 919 | break; |
b4a75708 | 920 | |
606828e4 | 921 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
922 | /* |
923 | * Needs to be explicitly enabled after creation, since | |
924 | * we may want to apply filters. | |
925 | */ | |
a67ba386 MD |
926 | event_recorder->parent.enabled = 0; |
927 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
928 | /* |
929 | * Populate lttng_event structure before event | |
930 | * registration. | |
931 | */ | |
932 | smp_wmb(); | |
8bf17deb | 933 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
934 | event_param->u.kprobe.symbol_name, |
935 | event_param->u.kprobe.offset, | |
936 | event_param->u.kprobe.addr, | |
a67ba386 | 937 | event_recorder); |
abc0446a | 938 | if (ret) { |
4cf0bf51 | 939 | ret = -EINVAL; |
d6d808f3 | 940 | goto register_error; |
abc0446a | 941 | } |
a67ba386 | 942 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 943 | WARN_ON_ONCE(!ret); |
d6d808f3 | 944 | break; |
b4a75708 | 945 | |
606828e4 | 946 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 947 | { |
a67ba386 MD |
948 | struct lttng_kernel_event_recorder *event_recorder_return; |
949 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
950 | |
951 | /* kretprobe defines 2 events */ | |
a0493bef MD |
952 | /* |
953 | * Needs to be explicitly enabled after creation, since | |
954 | * we may want to apply filters. | |
955 | */ | |
a67ba386 MD |
956 | event_recorder->parent.enabled = 0; |
957 | event_recorder->priv->parent.registered = 1; | |
958 | ||
959 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
960 | if (!event_recorder_return) { | |
961 | ret = -ENOMEM; | |
962 | goto register_error; | |
963 | } | |
964 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
965 | if (!event_recorder_return_priv) { | |
966 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 967 | ret = -ENOMEM; |
7371f44c | 968 | goto register_error; |
abc0446a | 969 | } |
a67ba386 MD |
970 | event_recorder_return_priv->pub = event_recorder_return; |
971 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
972 | event_recorder_return->priv = event_recorder_return_priv; | |
973 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
974 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
975 | ||
8a445457 | 976 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 MD |
977 | event_recorder_return->chan = chan; |
978 | event_recorder_return->priv->id = chan->free_event_id++; | |
979 | event_recorder_return->priv->parent.instrumentation = itype; | |
980 | event_recorder_return->parent.enabled = 0; | |
981 | event_recorder_return->priv->parent.registered = 1; | |
982 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
983 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 984 | /* |
a90917c3 | 985 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
986 | */ |
987 | smp_wmb(); | |
3c997079 | 988 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
989 | event_param->u.kretprobe.symbol_name, |
990 | event_param->u.kretprobe.offset, | |
991 | event_param->u.kretprobe.addr, | |
a67ba386 | 992 | event_recorder, event_recorder_return); |
7371f44c | 993 | if (ret) { |
a67ba386 MD |
994 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
995 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 996 | ret = -EINVAL; |
7371f44c MD |
997 | goto register_error; |
998 | } | |
999 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1000 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1001 | WARN_ON_ONCE(!ret); |
a67ba386 | 1002 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1003 | WARN_ON_ONCE(!ret); |
a90917c3 | 1004 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
a67ba386 | 1005 | event_recorder_return); |
abc0446a | 1006 | WARN_ON_ONCE(ret > 0); |
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); | |
1010 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1011 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1012 | goto statedump_error; |
1013 | } | |
8cdc1a81 | 1014 | list_add(&event_recorder_return->priv->node, &chan->session->priv->events); |
7371f44c MD |
1015 | break; |
1016 | } | |
b4a75708 | 1017 | |
606828e4 | 1018 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1019 | /* |
1020 | * Needs to be explicitly enabled after creation, since | |
1021 | * we may want to apply filters. | |
1022 | */ | |
a67ba386 MD |
1023 | event_recorder->parent.enabled = 0; |
1024 | event_recorder->priv->parent.registered = 0; | |
1025 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1026 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1027 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1028 | ret = -EINVAL; |
1029 | goto register_error; | |
606828e4 | 1030 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1031 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1032 | break; |
606828e4 | 1033 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1034 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1035 | break; |
1036 | } | |
1037 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1038 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1039 | ret = -EINVAL; |
1040 | goto register_error; | |
606828e4 | 1041 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1042 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1043 | break; |
606828e4 | 1044 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1045 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1046 | break; |
1047 | } | |
a67ba386 | 1048 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1049 | ret = -EINVAL; |
259b6cb3 | 1050 | goto register_error; |
abc0446a | 1051 | } |
1ec65de1 | 1052 | break; |
b4a75708 | 1053 | |
606828e4 | 1054 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1055 | /* |
1056 | * Needs to be explicitly enabled after creation, since | |
1057 | * we may want to apply filters. | |
1058 | */ | |
a67ba386 MD |
1059 | event_recorder->parent.enabled = 0; |
1060 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1061 | |
a344f64b FD |
1062 | /* |
1063 | * Populate lttng_event structure before event | |
1064 | * registration. | |
1065 | */ | |
1066 | smp_wmb(); | |
149b9a9d | 1067 | |
83b802dc | 1068 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1069 | event_param->u.uprobe.fd, |
a67ba386 | 1070 | event_recorder); |
149b9a9d YB |
1071 | if (ret) |
1072 | goto register_error; | |
a67ba386 | 1073 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1074 | WARN_ON_ONCE(!ret); |
1075 | break; | |
b4a75708 | 1076 | |
606828e4 MD |
1077 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1078 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1079 | default: |
1080 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1081 | ret = -EINVAL; |
df07930b | 1082 | goto register_error; |
baf20995 | 1083 | } |
a67ba386 | 1084 | ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder); |
abc0446a MD |
1085 | WARN_ON_ONCE(ret > 0); |
1086 | if (ret) { | |
c099397a | 1087 | goto statedump_error; |
abc0446a | 1088 | } |
a67ba386 | 1089 | hlist_add_head(&event_recorder->priv->hlist, head); |
8cdc1a81 | 1090 | list_add(&event_recorder->priv->node, &chan->session->priv->events); |
a67ba386 | 1091 | return event_recorder; |
4e3c1b9b | 1092 | |
c099397a | 1093 | statedump_error: |
259b6cb3 | 1094 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1095 | register_error: |
a67ba386 MD |
1096 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1097 | cache_private_error: | |
1098 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1099 | cache_error: |
1100 | exist: | |
3c997079 | 1101 | type_error: |
e5382b6d | 1102 | full: |
4cf0bf51 | 1103 | return ERR_PTR(ret); |
4e3c1b9b MD |
1104 | } |
1105 | ||
a67ba386 | 1106 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1107 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1108 | uint64_t token, uint64_t error_counter_index, |
1109 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1110 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1111 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1112 | { |
a67ba386 MD |
1113 | struct lttng_kernel_event_notifier *event_notifier; |
1114 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1115 | struct lttng_counter *error_counter; |
dffef45d FD |
1116 | const char *event_name; |
1117 | struct hlist_head *head; | |
1118 | int ret; | |
1119 | ||
1120 | switch (itype) { | |
606828e4 | 1121 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1122 | event_name = event_desc->event_name; |
b01155ba | 1123 | break; |
b4a75708 | 1124 | |
606828e4 MD |
1125 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1126 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1127 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1128 | event_name = event_notifier_param->event.name; |
1129 | break; | |
b4a75708 | 1130 | |
606828e4 MD |
1131 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1132 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1133 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1134 | default: |
1135 | WARN_ON_ONCE(1); | |
1136 | ret = -EINVAL; | |
1137 | goto type_error; | |
1138 | } | |
1139 | ||
1140 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1141 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1142 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1143 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1144 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1145 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1146 | && event_notifier_group == event_notifier_priv->group |
1147 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1148 | ret = -EEXIST; |
1149 | goto exist; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1154 | if (!event_notifier) { | |
1155 | ret = -ENOMEM; | |
1156 | goto cache_error; | |
1157 | } | |
a67ba386 MD |
1158 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1159 | if (!event_notifier_priv) { | |
1160 | ret = -ENOMEM; | |
1161 | goto cache_private_error; | |
1162 | } | |
1163 | event_notifier_priv->pub = event_notifier; | |
1164 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1165 | event_notifier->priv = event_notifier_priv; | |
1166 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1167 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1168 | ||
1169 | event_notifier->priv->group = event_notifier_group; | |
1170 | event_notifier->priv->parent.user_token = token; | |
1171 | event_notifier->priv->error_counter_index = error_counter_index; | |
1172 | event_notifier->priv->num_captures = 0; | |
1173 | event_notifier->priv->parent.instrumentation = itype; | |
1174 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1175 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1176 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1177 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1178 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1179 | |
1180 | switch (itype) { | |
606828e4 | 1181 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1182 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1183 | event_notifier->parent.enabled = 0; |
1184 | event_notifier->priv->parent.registered = 0; | |
1185 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1186 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1187 | ret = -ENOENT; |
1188 | goto register_error; | |
1189 | } | |
1190 | /* Populate lttng_event_notifier structure before event registration. */ | |
1191 | smp_wmb(); | |
1192 | break; | |
b4a75708 | 1193 | |
606828e4 | 1194 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1195 | /* |
1196 | * Needs to be explicitly enabled after creation, since | |
1197 | * we may want to apply filters. | |
1198 | */ | |
a67ba386 MD |
1199 | event_notifier->parent.enabled = 0; |
1200 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1201 | /* |
1202 | * Populate lttng_event_notifier structure before event | |
1203 | * registration. | |
1204 | */ | |
1205 | smp_wmb(); | |
1206 | ret = lttng_kprobes_register_event_notifier( | |
1207 | event_notifier_param->event.u.kprobe.symbol_name, | |
1208 | event_notifier_param->event.u.kprobe.offset, | |
1209 | event_notifier_param->event.u.kprobe.addr, | |
1210 | event_notifier); | |
1211 | if (ret) { | |
1212 | ret = -EINVAL; | |
1213 | goto register_error; | |
1214 | } | |
a67ba386 | 1215 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1216 | WARN_ON_ONCE(!ret); |
1217 | break; | |
b4a75708 | 1218 | |
606828e4 | 1219 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1220 | /* |
1221 | * Needs to be explicitly enabled after creation, since | |
1222 | * we may want to apply filters. | |
1223 | */ | |
a67ba386 MD |
1224 | event_notifier->parent.enabled = 0; |
1225 | event_notifier->priv->parent.registered = 0; | |
1226 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1227 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1228 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1229 | ret = -EINVAL; |
1230 | goto register_error; | |
606828e4 | 1231 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1232 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1233 | break; |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1235 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1236 | break; |
1237 | } | |
1238 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1239 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1240 | ret = -EINVAL; |
1241 | goto register_error; | |
606828e4 | 1242 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1243 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1244 | break; |
606828e4 | 1245 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1246 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1247 | break; |
1248 | } | |
1249 | ||
a67ba386 | 1250 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1251 | ret = -EINVAL; |
1252 | goto register_error; | |
1253 | } | |
1254 | break; | |
b4a75708 | 1255 | |
606828e4 | 1256 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1257 | /* |
1258 | * Needs to be explicitly enabled after creation, since | |
1259 | * we may want to apply filters. | |
1260 | */ | |
a67ba386 MD |
1261 | event_notifier->parent.enabled = 0; |
1262 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1263 | |
1264 | /* | |
1265 | * Populate lttng_event_notifier structure before | |
1266 | * event_notifier registration. | |
1267 | */ | |
1268 | smp_wmb(); | |
1269 | ||
1270 | ret = lttng_uprobes_register_event_notifier( | |
1271 | event_notifier_param->event.name, | |
1272 | event_notifier_param->event.u.uprobe.fd, | |
1273 | event_notifier); | |
1274 | if (ret) | |
1275 | goto register_error; | |
a67ba386 | 1276 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1277 | WARN_ON_ONCE(!ret); |
1278 | break; | |
b4a75708 | 1279 | |
606828e4 MD |
1280 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1281 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1282 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1283 | default: |
1284 | WARN_ON_ONCE(1); | |
1285 | ret = -EINVAL; | |
1286 | goto register_error; | |
1287 | } | |
1288 | ||
a67ba386 MD |
1289 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1290 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1291 | |
1292 | /* | |
1293 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1294 | * bucket is currently in use. We trust it. The session lock |
1295 | * synchronizes against concurrent creation of the error | |
1296 | * counter. | |
99f52fcc | 1297 | */ |
ab04d7b1 MD |
1298 | error_counter = event_notifier_group->error_counter; |
1299 | if (error_counter) { | |
99f52fcc FD |
1300 | size_t dimension_index[1]; |
1301 | ||
1302 | /* | |
1303 | * Check that the index is within the boundary of the counter. | |
1304 | */ | |
a67ba386 | 1305 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1306 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1307 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1308 | ret = -EINVAL; |
1309 | goto register_error; | |
1310 | } | |
1311 | ||
a67ba386 | 1312 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1313 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1314 | if (ret) { |
1315 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1316 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1317 | goto register_error; |
1318 | } | |
1319 | } | |
1320 | ||
dffef45d FD |
1321 | return event_notifier; |
1322 | ||
1323 | register_error: | |
a67ba386 MD |
1324 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1325 | cache_private_error: | |
dffef45d FD |
1326 | kmem_cache_free(event_notifier_cache, event_notifier); |
1327 | cache_error: | |
1328 | exist: | |
1329 | type_error: | |
1330 | return ERR_PTR(ret); | |
1331 | } | |
1332 | ||
99f52fcc FD |
1333 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1334 | const size_t *dim_indexes, int32_t cpu, | |
1335 | int64_t *val, bool *overflow, bool *underflow) | |
1336 | { | |
1337 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1338 | cpu, val, overflow, underflow); | |
1339 | } | |
1340 | ||
1341 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1342 | const size_t *dim_indexes, int64_t *val, | |
1343 | bool *overflow, bool *underflow) | |
1344 | { | |
1345 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1346 | val, overflow, underflow); | |
1347 | } | |
1348 | ||
1349 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1350 | const size_t *dim_indexes) | |
1351 | { | |
1352 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1353 | } | |
1354 | ||
a67ba386 | 1355 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan, |
606828e4 | 1356 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1357 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1358 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1359 | { |
a67ba386 | 1360 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1361 | |
1362 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1363 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1364 | mutex_unlock(&sessions_mutex); |
1365 | return event; | |
1366 | } | |
1367 | ||
a67ba386 | 1368 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1369 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1370 | uint64_t id, uint64_t error_counter_index, |
1371 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1372 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1373 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1374 | { |
a67ba386 | 1375 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1376 | |
1377 | mutex_lock(&sessions_mutex); | |
1378 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1379 | error_counter_index, event_notifier_group, |
a67ba386 | 1380 | event_notifier_param, itype); |
dffef45d FD |
1381 | mutex_unlock(&sessions_mutex); |
1382 | return event_notifier; | |
1383 | } | |
1384 | ||
3c997079 MD |
1385 | /* Only used for tracepoints for now. */ |
1386 | static | |
a67ba386 | 1387 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1388 | { |
437d5aa5 | 1389 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1390 | int ret = -EINVAL; |
3c997079 | 1391 | |
a67ba386 | 1392 | if (event_recorder->priv->parent.registered) |
3c997079 | 1393 | return; |
4ecb5ad5 | 1394 | |
a67ba386 MD |
1395 | desc = event_recorder->priv->parent.desc; |
1396 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1397 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1398 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
4ecb5ad5 | 1399 | desc->probe_callback, |
a67ba386 | 1400 | event_recorder); |
4ecb5ad5 | 1401 | break; |
b4a75708 | 1402 | |
606828e4 | 1403 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1404 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1405 | break; |
b4a75708 | 1406 | |
606828e4 MD |
1407 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1408 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1409 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1410 | ret = 0; |
1411 | break; | |
b4a75708 | 1412 | |
606828e4 MD |
1413 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1414 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1415 | default: |
1416 | WARN_ON_ONCE(1); | |
1417 | } | |
3c997079 | 1418 | if (!ret) |
a67ba386 | 1419 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1420 | } |
1421 | ||
4e3c1b9b MD |
1422 | /* |
1423 | * Only used internally at session destruction. | |
1424 | */ | |
a67ba386 | 1425 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1426 | { |
a67ba386 | 1427 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1428 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1429 | int ret = -EINVAL; |
1430 | ||
a67ba386 | 1431 | if (!event_priv->registered) |
3c997079 MD |
1432 | return 0; |
1433 | ||
a67ba386 MD |
1434 | desc = event_priv->desc; |
1435 | switch (event_priv->instrumentation) { | |
606828e4 | 1436 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 MD |
1437 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
1438 | event_priv->desc->probe_callback, | |
1439 | event_recorder); | |
baf20995 | 1440 | break; |
b4a75708 | 1441 | |
606828e4 | 1442 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1443 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1444 | ret = 0; |
1445 | break; | |
b4a75708 | 1446 | |
606828e4 | 1447 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1448 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1449 | ret = 0; |
1450 | break; | |
b4a75708 | 1451 | |
606828e4 | 1452 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1453 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1454 | break; |
b4a75708 | 1455 | |
606828e4 | 1456 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1457 | ret = 0; |
1458 | break; | |
b4a75708 | 1459 | |
606828e4 | 1460 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1461 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1462 | ret = 0; |
1463 | break; | |
b4a75708 | 1464 | |
606828e4 | 1465 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1466 | default: |
1467 | WARN_ON_ONCE(1); | |
1468 | } | |
3c997079 | 1469 | if (!ret) |
a67ba386 | 1470 | event_priv->registered = 0; |
dda6a249 MD |
1471 | return ret; |
1472 | } | |
1473 | ||
dffef45d FD |
1474 | /* Only used for tracepoints for now. */ |
1475 | static | |
a67ba386 | 1476 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1477 | { |
437d5aa5 | 1478 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1479 | int ret = -EINVAL; |
1480 | ||
a67ba386 | 1481 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1482 | return; |
1483 | ||
a67ba386 MD |
1484 | desc = event_notifier->priv->parent.desc; |
1485 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1486 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1487 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e2d5dbc7 | 1488 | desc->probe_callback, |
b01155ba FD |
1489 | event_notifier); |
1490 | break; | |
b4a75708 | 1491 | |
606828e4 | 1492 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1493 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1494 | break; | |
b4a75708 | 1495 | |
606828e4 MD |
1496 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1497 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1498 | ret = 0; |
1499 | break; | |
b4a75708 | 1500 | |
606828e4 MD |
1501 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1502 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1503 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1504 | default: |
1505 | WARN_ON_ONCE(1); | |
1506 | } | |
1507 | if (!ret) | |
a67ba386 | 1508 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1509 | } |
1510 | ||
1511 | static | |
1512 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1513 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1514 | { |
437d5aa5 | 1515 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1516 | int ret = -EINVAL; |
1517 | ||
a67ba386 | 1518 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1519 | return 0; |
1520 | ||
a67ba386 MD |
1521 | desc = event_notifier->priv->parent.desc; |
1522 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1523 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1524 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e2d5dbc7 | 1525 | event_notifier->priv->parent.desc->probe_callback, |
b01155ba FD |
1526 | event_notifier); |
1527 | break; | |
b4a75708 | 1528 | |
606828e4 | 1529 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1530 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1531 | ret = 0; | |
1532 | break; | |
b4a75708 | 1533 | |
606828e4 | 1534 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1535 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1536 | ret = 0; | |
1537 | break; | |
b4a75708 | 1538 | |
606828e4 | 1539 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1540 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1541 | break; | |
b4a75708 | 1542 | |
606828e4 MD |
1543 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1544 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1545 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1546 | default: |
1547 | WARN_ON_ONCE(1); | |
1548 | } | |
1549 | if (!ret) | |
a67ba386 | 1550 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1551 | return ret; |
1552 | } | |
1553 | ||
dda6a249 MD |
1554 | /* |
1555 | * Only used internally at session destruction. | |
1556 | */ | |
be066e6c | 1557 | static |
0648898e | 1558 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1559 | { |
0648898e | 1560 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1561 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1562 | ||
0648898e MD |
1563 | lttng_free_event_filter_runtime(event); |
1564 | /* Free event enabler refs */ | |
1565 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1566 | &event_priv->enablers_ref_head, node) | |
1567 | kfree(enabler_ref); | |
b4a75708 | 1568 | |
0648898e MD |
1569 | switch (event->type) { |
1570 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1571 | { | |
1572 | struct lttng_kernel_event_recorder *event_recorder = | |
1573 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1574 | |
0648898e MD |
1575 | switch (event_priv->instrumentation) { |
1576 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1577 | lttng_event_desc_put(event_priv->desc); | |
1578 | break; | |
b4a75708 | 1579 | |
0648898e MD |
1580 | case LTTNG_KERNEL_ABI_KPROBE: |
1581 | module_put(event_priv->desc->owner); | |
1582 | lttng_kprobes_destroy_event_private(event_recorder); | |
1583 | break; | |
b4a75708 | 1584 | |
0648898e MD |
1585 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1586 | module_put(event_priv->desc->owner); | |
1587 | lttng_kretprobes_destroy_private(event_recorder); | |
1588 | break; | |
b4a75708 | 1589 | |
0648898e MD |
1590 | case LTTNG_KERNEL_ABI_SYSCALL: |
1591 | break; | |
4e3c1b9b | 1592 | |
0648898e MD |
1593 | case LTTNG_KERNEL_ABI_UPROBE: |
1594 | module_put(event_priv->desc->owner); | |
1595 | lttng_uprobes_destroy_event_private(event_recorder); | |
1596 | break; | |
3ef5cc03 | 1597 | |
0648898e MD |
1598 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1599 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1600 | default: | |
1601 | WARN_ON_ONCE(1); | |
1602 | } | |
1603 | list_del(&event_recorder->priv->node); | |
1604 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1605 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1606 | break; |
0648898e MD |
1607 | } |
1608 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1609 | { | |
1610 | struct lttng_kernel_event_notifier *event_notifier = | |
1611 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1612 | |
0648898e MD |
1613 | switch (event_notifier->priv->parent.instrumentation) { |
1614 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1615 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1616 | break; | |
b4a75708 | 1617 | |
0648898e MD |
1618 | case LTTNG_KERNEL_ABI_KPROBE: |
1619 | module_put(event_notifier->priv->parent.desc->owner); | |
1620 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1621 | break; | |
b4a75708 | 1622 | |
0648898e MD |
1623 | case LTTNG_KERNEL_ABI_SYSCALL: |
1624 | break; | |
b4a75708 | 1625 | |
0648898e MD |
1626 | case LTTNG_KERNEL_ABI_UPROBE: |
1627 | module_put(event_notifier->priv->parent.desc->owner); | |
1628 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1629 | break; | |
1630 | ||
1631 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1632 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1633 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1634 | default: | |
1635 | WARN_ON_ONCE(1); | |
1636 | } | |
1637 | list_del(&event_notifier->priv->node); | |
1638 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1639 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1640 | break; | |
1641 | } | |
dffef45d FD |
1642 | default: |
1643 | WARN_ON_ONCE(1); | |
1644 | } | |
dffef45d FD |
1645 | } |
1646 | ||
8cdc1a81 | 1647 | struct lttng_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1648 | enum tracker_type tracker_type) |
e0130fab | 1649 | { |
d1f652f8 MD |
1650 | switch (tracker_type) { |
1651 | case TRACKER_PID: | |
1652 | return &session->pid_tracker; | |
1653 | case TRACKER_VPID: | |
1654 | return &session->vpid_tracker; | |
1655 | case TRACKER_UID: | |
1656 | return &session->uid_tracker; | |
1657 | case TRACKER_VUID: | |
1658 | return &session->vuid_tracker; | |
1659 | case TRACKER_GID: | |
1660 | return &session->gid_tracker; | |
1661 | case TRACKER_VGID: | |
1662 | return &session->vgid_tracker; | |
1663 | default: | |
1664 | WARN_ON_ONCE(1); | |
1665 | return NULL; | |
1666 | } | |
1667 | } | |
1668 | ||
8cdc1a81 | 1669 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1670 | enum tracker_type tracker_type, int id) |
1671 | { | |
1672 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1673 | int ret; |
1674 | ||
d1f652f8 MD |
1675 | tracker = get_tracker(session, tracker_type); |
1676 | if (!tracker) | |
1677 | return -EINVAL; | |
1678 | if (id < -1) | |
e0130fab MD |
1679 | return -EINVAL; |
1680 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1681 | if (id == -1) { |
1682 | /* track all ids: destroy tracker. */ | |
1683 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1684 | ret = 0; |
1685 | } else { | |
d1f652f8 | 1686 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1687 | } |
e0130fab MD |
1688 | mutex_unlock(&sessions_mutex); |
1689 | return ret; | |
1690 | } | |
1691 | ||
8cdc1a81 | 1692 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1693 | enum tracker_type tracker_type, int id) |
e0130fab | 1694 | { |
d1f652f8 | 1695 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1696 | int ret; |
1697 | ||
d1f652f8 MD |
1698 | tracker = get_tracker(session, tracker_type); |
1699 | if (!tracker) | |
1700 | return -EINVAL; | |
1701 | if (id < -1) | |
e0130fab MD |
1702 | return -EINVAL; |
1703 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1704 | if (id == -1) { |
1705 | /* untrack all ids: replace by empty tracker. */ | |
1706 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1707 | } else { |
d1f652f8 | 1708 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1709 | } |
e0130fab MD |
1710 | mutex_unlock(&sessions_mutex); |
1711 | return ret; | |
1712 | } | |
1713 | ||
7e6f9ef6 | 1714 | static |
d1f652f8 | 1715 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1716 | { |
d1f652f8 MD |
1717 | struct lttng_id_tracker *id_tracker = m->private; |
1718 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1719 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1720 | int iter = 0, i; |
1721 | ||
1722 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1723 | if (id_tracker_p) { |
1724 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1725 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1726 | |
f934e302 | 1727 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1728 | if (iter++ >= *pos) |
1729 | return e; | |
1730 | } | |
1731 | } | |
1732 | } else { | |
d1f652f8 | 1733 | /* ID tracker disabled. */ |
7e6f9ef6 | 1734 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1735 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1736 | } |
1737 | iter++; | |
1738 | } | |
1739 | /* End of list */ | |
1740 | return NULL; | |
1741 | } | |
1742 | ||
1743 | /* Called with sessions_mutex held. */ | |
1744 | static | |
d1f652f8 | 1745 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1746 | { |
d1f652f8 MD |
1747 | struct lttng_id_tracker *id_tracker = m->private; |
1748 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1749 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1750 | int iter = 0, i; |
1751 | ||
1752 | (*ppos)++; | |
d1f652f8 MD |
1753 | if (id_tracker_p) { |
1754 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1755 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1756 | |
f934e302 | 1757 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1758 | if (iter++ >= *ppos) |
1759 | return e; | |
1760 | } | |
1761 | } | |
1762 | } else { | |
d1f652f8 | 1763 | /* ID tracker disabled. */ |
7e6f9ef6 | 1764 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1765 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1766 | iter++; |
1767 | } | |
1768 | ||
1769 | /* End of list */ | |
1770 | return NULL; | |
1771 | } | |
1772 | ||
1773 | static | |
d1f652f8 | 1774 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1775 | { |
1776 | mutex_unlock(&sessions_mutex); | |
1777 | } | |
1778 | ||
1779 | static | |
d1f652f8 | 1780 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1781 | { |
d1f652f8 MD |
1782 | struct lttng_id_tracker *id_tracker = m->private; |
1783 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1784 | int id; | |
7e6f9ef6 | 1785 | |
d1f652f8 | 1786 | if (p == id_tracker_p) { |
7e6f9ef6 | 1787 | /* Tracker disabled. */ |
d1f652f8 | 1788 | id = -1; |
7e6f9ef6 | 1789 | } else { |
d1f652f8 | 1790 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1791 | |
d1f652f8 MD |
1792 | id = lttng_id_tracker_get_node_id(e); |
1793 | } | |
1794 | switch (id_tracker->tracker_type) { | |
1795 | case TRACKER_PID: | |
1796 | seq_printf(m, "process { pid = %d; };\n", id); | |
1797 | break; | |
1798 | case TRACKER_VPID: | |
1799 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1800 | break; | |
1801 | case TRACKER_UID: | |
1802 | seq_printf(m, "user { uid = %d; };\n", id); | |
1803 | break; | |
1804 | case TRACKER_VUID: | |
1805 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1806 | break; | |
1807 | case TRACKER_GID: | |
1808 | seq_printf(m, "group { gid = %d; };\n", id); | |
1809 | break; | |
1810 | case TRACKER_VGID: | |
1811 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1812 | break; | |
1813 | default: | |
1814 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1815 | } |
7e6f9ef6 MD |
1816 | return 0; |
1817 | } | |
1818 | ||
1819 | static | |
d1f652f8 MD |
1820 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1821 | .start = id_list_start, | |
1822 | .next = id_list_next, | |
1823 | .stop = id_list_stop, | |
1824 | .show = id_list_show, | |
7e6f9ef6 MD |
1825 | }; |
1826 | ||
1827 | static | |
d1f652f8 | 1828 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1829 | { |
d1f652f8 | 1830 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1831 | } |
1832 | ||
1833 | static | |
d1f652f8 | 1834 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1835 | { |
1836 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1837 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1838 | int ret; |
1839 | ||
d1f652f8 | 1840 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1841 | ret = seq_release(inode, file); |
d1f652f8 | 1842 | if (!ret) |
8cdc1a81 | 1843 | fput(id_tracker->session->priv->file); |
7e6f9ef6 MD |
1844 | return ret; |
1845 | } | |
1846 | ||
d1f652f8 | 1847 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1848 | .owner = THIS_MODULE, |
d1f652f8 | 1849 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1850 | .read = seq_read, |
1851 | .llseek = seq_lseek, | |
d1f652f8 | 1852 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1853 | }; |
1854 | ||
8cdc1a81 | 1855 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1856 | enum tracker_type tracker_type) |
7e6f9ef6 | 1857 | { |
d1f652f8 | 1858 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1859 | struct seq_file *m; |
1860 | int file_fd, ret; | |
1861 | ||
1862 | file_fd = lttng_get_unused_fd(); | |
1863 | if (file_fd < 0) { | |
1864 | ret = file_fd; | |
1865 | goto fd_error; | |
1866 | } | |
1867 | ||
d1f652f8 MD |
1868 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1869 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1870 | NULL, O_RDWR); |
d1f652f8 MD |
1871 | if (IS_ERR(tracker_ids_list_file)) { |
1872 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1873 | goto file_error; |
1874 | } | |
8cdc1a81 | 1875 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1876 | ret = -EOVERFLOW; |
9c1f4643 MD |
1877 | goto refcount_error; |
1878 | } | |
d1f652f8 | 1879 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1880 | if (ret < 0) |
1881 | goto open_error; | |
d1f652f8 MD |
1882 | m = tracker_ids_list_file->private_data; |
1883 | ||
1884 | m->private = get_tracker(session, tracker_type); | |
1885 | BUG_ON(!m->private); | |
1886 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1887 | |
1888 | return file_fd; | |
1889 | ||
1890 | open_error: | |
8cdc1a81 | 1891 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1892 | refcount_error: |
d1f652f8 | 1893 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1894 | file_error: |
1895 | put_unused_fd(file_fd); | |
1896 | fd_error: | |
1897 | return ret; | |
1898 | } | |
1899 | ||
3c997079 MD |
1900 | /* |
1901 | * Enabler management. | |
1902 | */ | |
1903 | static | |
4993071a PP |
1904 | int lttng_match_enabler_star_glob(const char *desc_name, |
1905 | const char *pattern) | |
3c997079 | 1906 | { |
cbc19040 MD |
1907 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1908 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1909 | return 0; |
1910 | return 1; | |
1911 | } | |
1912 | ||
1913 | static | |
4ecb5ad5 MD |
1914 | int lttng_match_enabler_name(const char *desc_name, |
1915 | const char *name) | |
3c997079 | 1916 | { |
4ecb5ad5 | 1917 | if (strcmp(desc_name, name)) |
3c997079 MD |
1918 | return 0; |
1919 | return 1; | |
1920 | } | |
1921 | ||
437d5aa5 | 1922 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1923 | struct lttng_enabler *enabler) |
1924 | { | |
4ecb5ad5 | 1925 | const char *desc_name, *enabler_name; |
badfe9f5 | 1926 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1927 | |
1928 | enabler_name = enabler->event_param.name; | |
1929 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1930 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1931 | desc_name = desc->event_name; |
3b861b22 FD |
1932 | switch (enabler->format_type) { |
1933 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1934 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1935 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1936 | return lttng_match_enabler_name(desc_name, enabler_name); |
1937 | default: | |
1938 | return -EINVAL; | |
1939 | } | |
4ecb5ad5 | 1940 | break; |
b4a75708 | 1941 | |
606828e4 | 1942 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1943 | desc_name = desc->event_name; |
badfe9f5 | 1944 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1945 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1946 | compat = true; |
1947 | } | |
4ecb5ad5 MD |
1948 | if (!strncmp(desc_name, "syscall_exit_", |
1949 | strlen("syscall_exit_"))) { | |
1950 | desc_name += strlen("syscall_exit_"); | |
1951 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1952 | strlen("syscall_entry_"))) { | |
1953 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1954 | entry = true; |
4ecb5ad5 MD |
1955 | } else { |
1956 | WARN_ON_ONCE(1); | |
1957 | return -EINVAL; | |
1958 | } | |
badfe9f5 | 1959 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1960 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1961 | break; |
606828e4 | 1962 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1963 | if (!entry) |
1964 | return 0; | |
1965 | break; | |
606828e4 | 1966 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1967 | if (entry) |
1968 | return 0; | |
1969 | break; | |
1970 | default: | |
1971 | return -EINVAL; | |
1972 | } | |
1973 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1974 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1975 | break; |
606828e4 | 1976 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1977 | if (compat) |
1978 | return 0; | |
1979 | break; | |
606828e4 | 1980 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1981 | if (!compat) |
1982 | return 0; | |
1983 | break; | |
1984 | default: | |
1985 | return -EINVAL; | |
1986 | } | |
1987 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1988 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1989 | switch (enabler->format_type) { |
1990 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1991 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1992 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1993 | return lttng_match_enabler_name(desc_name, enabler_name); |
1994 | default: | |
1995 | return -EINVAL; | |
1996 | } | |
1997 | break; | |
606828e4 | 1998 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1999 | return -EINVAL; /* Not implemented. */ |
2000 | default: | |
2001 | return -EINVAL; | |
2002 | } | |
4ecb5ad5 | 2003 | break; |
b4a75708 | 2004 | |
4ecb5ad5 MD |
2005 | default: |
2006 | WARN_ON_ONCE(1); | |
2007 | return -EINVAL; | |
2008 | } | |
3c997079 MD |
2009 | } |
2010 | ||
2011 | static | |
b2bc0bc8 | 2012 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2013 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2014 | { |
b2bc0bc8 FD |
2015 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2016 | event_enabler); | |
2017 | ||
a67ba386 | 2018 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2019 | return 0; |
a67ba386 MD |
2020 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2021 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2022 | return 1; |
2023 | else | |
2024 | return 0; | |
2025 | } | |
2026 | ||
b01155ba FD |
2027 | static |
2028 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2029 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2030 | { |
2031 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2032 | event_notifier_enabler); | |
2033 | ||
a67ba386 | 2034 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2035 | return 0; |
a67ba386 MD |
2036 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2037 | && event_notifier->priv->group == event_notifier_enabler->group | |
2038 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2039 | return 1; |
2040 | else | |
2041 | return 0; | |
2042 | } | |
2043 | ||
3c997079 | 2044 | static |
b2bc0bc8 FD |
2045 | struct lttng_enabler_ref *lttng_enabler_ref( |
2046 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2047 | struct lttng_enabler *enabler) |
2048 | { | |
2049 | struct lttng_enabler_ref *enabler_ref; | |
2050 | ||
b2bc0bc8 | 2051 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2052 | if (enabler_ref->ref == enabler) |
2053 | return enabler_ref; | |
2054 | } | |
2055 | return NULL; | |
2056 | } | |
2057 | ||
3c997079 | 2058 | static |
1b917d6b | 2059 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2060 | { |
8cdc1a81 | 2061 | struct lttng_kernel_session *session = event_enabler->chan->session; |
437d5aa5 MD |
2062 | struct lttng_kernel_probe_desc *probe_desc; |
2063 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2064 | int i; |
2065 | struct list_head *probe_list; | |
2066 | ||
2067 | probe_list = lttng_get_probe_list_head(); | |
2068 | /* | |
2069 | * For each probe event, if we find that a probe event matches | |
2070 | * our enabler, create an associated lttng_event if not | |
2071 | * already present. | |
2072 | */ | |
2073 | list_for_each_entry(probe_desc, probe_list, head) { | |
2074 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2075 | int found = 0; | |
2076 | struct hlist_head *head; | |
a67ba386 MD |
2077 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2078 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2079 | |
2080 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2081 | if (!lttng_desc_match_enabler(desc, |
2082 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2083 | continue; |
3c997079 MD |
2084 | |
2085 | /* | |
2086 | * Check if already created. | |
2087 | */ | |
4a11ef1c | 2088 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 2089 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2090 | desc->event_name); |
a67ba386 MD |
2091 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2092 | if (event_recorder_private->parent.desc == desc | |
2093 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2094 | found = 1; |
2095 | } | |
2096 | if (found) | |
2097 | continue; | |
2098 | ||
2099 | /* | |
2100 | * We need to create an event for this | |
2101 | * event probe. | |
2102 | */ | |
a67ba386 MD |
2103 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2104 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2105 | if (!event_recorder) { | |
5a15f70c | 2106 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2107 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2108 | } |
2109 | } | |
2110 | } | |
2111 | } | |
2112 | ||
b01155ba FD |
2113 | static |
2114 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2115 | { | |
2116 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2117 | struct lttng_kernel_probe_desc *probe_desc; |
2118 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2119 | int i; |
2120 | struct list_head *probe_list; | |
2121 | ||
2122 | probe_list = lttng_get_probe_list_head(); | |
2123 | /* | |
2124 | * For each probe event, if we find that a probe event matches | |
2125 | * our enabler, create an associated lttng_event_notifier if not | |
2126 | * already present. | |
2127 | */ | |
2128 | list_for_each_entry(probe_desc, probe_list, head) { | |
2129 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2130 | int found = 0; | |
2131 | struct hlist_head *head; | |
a67ba386 MD |
2132 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2133 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2134 | |
2135 | desc = probe_desc->event_desc[i]; | |
2136 | if (!lttng_desc_match_enabler(desc, | |
2137 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2138 | continue; | |
2139 | ||
2140 | /* | |
2141 | * Check if already created. | |
2142 | */ | |
2143 | head = utils_borrow_hash_table_bucket( | |
2144 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2145 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2146 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2147 | if (event_notifier_priv->parent.desc == desc | |
2148 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2149 | found = 1; |
2150 | } | |
2151 | if (found) | |
2152 | continue; | |
2153 | ||
2154 | /* | |
2155 | * We need to create a event_notifier for this event probe. | |
2156 | */ | |
2157 | event_notifier = _lttng_event_notifier_create(desc, | |
2158 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2159 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2160 | event_notifier_group, NULL, |
606828e4 | 2161 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2162 | if (IS_ERR(event_notifier)) { |
2163 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2164 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2165 | } |
2166 | } | |
2167 | } | |
2168 | } | |
2169 | ||
33a39a3c | 2170 | static |
1b917d6b | 2171 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2172 | { |
2173 | int ret; | |
2174 | ||
a67ba386 | 2175 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2176 | WARN_ON_ONCE(ret); |
2177 | } | |
2178 | ||
8a8ac9a8 FD |
2179 | static |
2180 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2181 | { | |
2182 | int ret; | |
2183 | ||
a67ba386 | 2184 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2185 | WARN_ON_ONCE(ret); |
a67ba386 | 2186 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2187 | WARN_ON_ONCE(ret); |
2188 | } | |
2189 | ||
33a39a3c | 2190 | /* |
a67ba386 | 2191 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2192 | * tracepoint probes. |
2193 | * Should be called with sessions mutex held. | |
2194 | */ | |
2195 | static | |
b2bc0bc8 | 2196 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2197 | { |
b2bc0bc8 | 2198 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2199 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2200 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2201 | break; |
b4a75708 | 2202 | |
606828e4 | 2203 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2204 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2205 | break; |
b4a75708 | 2206 | |
33a39a3c MD |
2207 | default: |
2208 | WARN_ON_ONCE(1); | |
2209 | break; | |
2210 | } | |
2211 | } | |
2212 | ||
3c997079 | 2213 | /* |
b2bc0bc8 | 2214 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2215 | * and add backward reference from the event to the enabler. |
2216 | * Should be called with sessions mutex held. | |
2217 | */ | |
2218 | static | |
b2bc0bc8 | 2219 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2220 | { |
b2bc0bc8 | 2221 | struct lttng_channel *chan = event_enabler->chan; |
8cdc1a81 | 2222 | struct lttng_kernel_session *session = event_enabler->chan->session; |
b2bc0bc8 | 2223 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2224 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2225 | |
606828e4 MD |
2226 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2227 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2228 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2229 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2230 | int enabled = base_enabler->enabled; |
606828e4 | 2231 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2232 | |
606828e4 | 2233 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 MD |
2234 | WRITE_ONCE(chan->syscall_all_entry, enabled); |
2235 | ||
606828e4 | 2236 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
3b82c4e1 | 2237 | WRITE_ONCE(chan->syscall_all_exit, enabled); |
badfe9f5 MD |
2238 | } |
2239 | ||
3c997079 | 2240 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2241 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2242 | |
b2bc0bc8 | 2243 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2244 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2245 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2246 | struct lttng_enabler_ref *enabler_ref; |
2247 | ||
a67ba386 | 2248 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2249 | continue; |
a67ba386 | 2250 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2251 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2252 | if (!enabler_ref) { |
2253 | /* | |
2254 | * If no backward ref, create it. | |
b2bc0bc8 | 2255 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2256 | */ |
2257 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2258 | if (!enabler_ref) | |
2259 | return -ENOMEM; | |
b2bc0bc8 | 2260 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2261 | list_add(&enabler_ref->node, |
a67ba386 | 2262 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2263 | } |
2264 | ||
f127e61e MD |
2265 | /* |
2266 | * Link filter bytecodes if not linked yet. | |
2267 | */ | |
a67ba386 | 2268 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2269 | lttng_static_ctx, |
a67ba386 | 2270 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2271 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2272 | } |
2273 | return 0; | |
2274 | } | |
2275 | ||
b01155ba | 2276 | /* |
a67ba386 | 2277 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2278 | * tracepoint probes. |
2279 | * Should be called with sessions mutex held. | |
2280 | */ | |
2281 | static | |
2282 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2283 | { | |
2284 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2285 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2286 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2287 | break; | |
b4a75708 | 2288 | |
606828e4 | 2289 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2290 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2291 | break; | |
b4a75708 | 2292 | |
b01155ba FD |
2293 | default: |
2294 | WARN_ON_ONCE(1); | |
2295 | break; | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2301 | */ | |
2302 | static | |
8a8ac9a8 FD |
2303 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2304 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2305 | { |
2306 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2307 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2308 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2309 | |
606828e4 MD |
2310 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2311 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2312 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2313 | !strcmp(base_enabler->event_param.name, "*")) { |
2314 | ||
2315 | int enabled = base_enabler->enabled; | |
606828e4 | 2316 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2317 | |
606828e4 | 2318 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2319 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2320 | ||
606828e4 | 2321 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2322 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2323 | ||
2324 | } | |
2325 | ||
b01155ba FD |
2326 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2327 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2328 | ||
2329 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2330 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2331 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2332 | struct lttng_enabler_ref *enabler_ref; |
2333 | ||
2334 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2335 | continue; | |
2336 | ||
a67ba386 | 2337 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2338 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2339 | if (!enabler_ref) { | |
2340 | /* | |
2341 | * If no backward ref, create it. | |
2342 | * Add backward ref from event_notifier to enabler. | |
2343 | */ | |
2344 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2345 | if (!enabler_ref) | |
2346 | return -ENOMEM; | |
2347 | ||
2348 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2349 | event_notifier_enabler); | |
2350 | list_add(&enabler_ref->node, | |
a67ba386 | 2351 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2352 | } |
2353 | ||
2354 | /* | |
2355 | * Link filter bytecodes if not linked yet. | |
2356 | */ | |
a67ba386 MD |
2357 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2358 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2359 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2360 | |
2361 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2362 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2363 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2364 | &event_notifier_enabler->capture_bytecode_head); |
2365 | ||
a67ba386 | 2366 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2367 | } |
2368 | return 0; | |
2369 | } | |
2370 | ||
3c997079 MD |
2371 | /* |
2372 | * Called at module load: connect the probe on all enablers matching | |
2373 | * this event. | |
2374 | * Called with sessions lock held. | |
2375 | */ | |
2376 | int lttng_fix_pending_events(void) | |
2377 | { | |
8cdc1a81 | 2378 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2379 | |
8cdc1a81 MD |
2380 | list_for_each_entry(session_priv, &sessions, list) |
2381 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2382 | return 0; |
2383 | } | |
2384 | ||
b01155ba FD |
2385 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2386 | struct lttng_event_notifier_group *event_notifier_group) | |
2387 | { | |
2388 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2389 | ||
2390 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2391 | node) { | |
2392 | if (event_notifier_enabler->base.enabled) | |
2393 | return true; | |
2394 | } | |
2395 | return false; | |
2396 | } | |
2397 | ||
2398 | bool lttng_event_notifier_active(void) | |
2399 | { | |
2400 | struct lttng_event_notifier_group *event_notifier_group; | |
2401 | ||
2402 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2403 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2404 | return true; | |
2405 | } | |
2406 | return false; | |
2407 | } | |
2408 | ||
2409 | int lttng_fix_pending_event_notifiers(void) | |
2410 | { | |
2411 | struct lttng_event_notifier_group *event_notifier_group; | |
2412 | ||
2413 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2414 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2415 | return 0; | |
2416 | } | |
2417 | ||
b2bc0bc8 FD |
2418 | struct lttng_event_enabler *lttng_event_enabler_create( |
2419 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2420 | struct lttng_kernel_abi_event *event_param, |
3c997079 MD |
2421 | struct lttng_channel *chan) |
2422 | { | |
b2bc0bc8 | 2423 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2424 | |
b2bc0bc8 FD |
2425 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2426 | if (!event_enabler) | |
3c997079 | 2427 | return NULL; |
b2bc0bc8 FD |
2428 | event_enabler->base.format_type = format_type; |
2429 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2430 | memcpy(&event_enabler->base.event_param, event_param, | |
2431 | sizeof(event_enabler->base.event_param)); | |
2432 | event_enabler->chan = chan; | |
3c997079 | 2433 | /* ctx left NULL */ |
b2bc0bc8 | 2434 | event_enabler->base.enabled = 0; |
3c997079 | 2435 | mutex_lock(&sessions_mutex); |
8cdc1a81 | 2436 | list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head); |
b2bc0bc8 | 2437 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
3c997079 | 2438 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2439 | return event_enabler; |
3c997079 MD |
2440 | } |
2441 | ||
b2bc0bc8 | 2442 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2443 | { |
2444 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2445 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2446 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2447 | mutex_unlock(&sessions_mutex); |
2448 | return 0; | |
2449 | } | |
2450 | ||
b2bc0bc8 | 2451 | int lttng_event_enabler_disable(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 = 0; |
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 | static |
183e8b3a | 2461 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2462 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2463 | { |
d64ca521 | 2464 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2465 | uint32_t bytecode_len; |
2466 | int ret; | |
2467 | ||
2468 | ret = get_user(bytecode_len, &bytecode->len); | |
2469 | if (ret) | |
2470 | return ret; | |
52cfcdf3 | 2471 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2472 | GFP_KERNEL); |
2473 | if (!bytecode_node) | |
2474 | return -ENOMEM; | |
2475 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2476 | sizeof(*bytecode) + bytecode_len); | |
2477 | if (ret) | |
2478 | goto error_free; | |
b2bc0bc8 | 2479 | |
8a445457 | 2480 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2481 | bytecode_node->enabler = enabler; |
2482 | /* Enforce length based on allocated size */ | |
2483 | bytecode_node->bc.len = bytecode_len; | |
2484 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2485 | |
07dfc1d0 MD |
2486 | return 0; |
2487 | ||
2488 | error_free: | |
52cfcdf3 | 2489 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2490 | return ret; |
2491 | } | |
2492 | ||
183e8b3a | 2493 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2494 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2495 | { |
2496 | int ret; | |
183e8b3a | 2497 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2498 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2499 | if (ret) | |
2500 | goto error; | |
2501 | ||
2502 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2503 | return 0; | |
2504 | ||
2505 | error: | |
2506 | return ret; | |
2507 | } | |
2508 | ||
e2d5dbc7 | 2509 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2510 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2511 | { |
2512 | ||
e2d5dbc7 | 2513 | switch (event->priv->instrumentation) { |
606828e4 | 2514 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2515 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2516 | default: |
2517 | return -EINVAL; | |
2518 | } | |
2519 | } | |
2520 | ||
3c997079 MD |
2521 | static |
2522 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2523 | { | |
d64ca521 | 2524 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2525 | |
2526 | /* Destroy filter bytecode */ | |
2527 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2528 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2529 | lttng_kvfree(filter_node); |
07dfc1d0 | 2530 | } |
b2bc0bc8 FD |
2531 | } |
2532 | ||
2533 | static | |
2534 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2535 | { | |
2536 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2537 | |
b2bc0bc8 FD |
2538 | list_del(&event_enabler->node); |
2539 | kfree(event_enabler); | |
3c997079 MD |
2540 | } |
2541 | ||
dffef45d FD |
2542 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2543 | struct lttng_event_notifier_group *event_notifier_group, | |
2544 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2545 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2546 | { |
2547 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2548 | ||
2549 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2550 | if (!event_notifier_enabler) | |
2551 | return NULL; | |
2552 | ||
2553 | event_notifier_enabler->base.format_type = format_type; | |
2554 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2555 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2556 | ||
99f52fcc | 2557 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2558 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2559 | |
8a8ac9a8 FD |
2560 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2561 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2562 | |
2563 | event_notifier_enabler->base.enabled = 0; | |
2564 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2565 | event_notifier_enabler->group = event_notifier_group; | |
2566 | ||
2567 | mutex_lock(&sessions_mutex); | |
2568 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2569 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2570 | |
2571 | mutex_unlock(&sessions_mutex); | |
2572 | ||
2573 | return event_notifier_enabler; | |
2574 | } | |
2575 | ||
2576 | int lttng_event_notifier_enabler_enable( | |
2577 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2578 | { | |
2579 | mutex_lock(&sessions_mutex); | |
2580 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2581 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2582 | mutex_unlock(&sessions_mutex); |
2583 | return 0; | |
2584 | } | |
2585 | ||
2586 | int lttng_event_notifier_enabler_disable( | |
2587 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2588 | { | |
2589 | mutex_lock(&sessions_mutex); | |
2590 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2591 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2592 | mutex_unlock(&sessions_mutex); |
2593 | return 0; | |
2594 | } | |
2595 | ||
183e8b3a | 2596 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2597 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2598 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2599 | { |
2600 | int ret; | |
2601 | ||
183e8b3a | 2602 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2603 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2604 | bytecode); | |
2605 | if (ret) | |
2606 | goto error; | |
2607 | ||
b01155ba | 2608 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2609 | return 0; |
2610 | ||
2611 | error: | |
2612 | return ret; | |
2613 | } | |
2614 | ||
99d223ad FD |
2615 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2616 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2617 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2618 | { |
d64ca521 | 2619 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2620 | struct lttng_enabler *enabler = |
2621 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2622 | uint32_t bytecode_len; | |
2623 | int ret; | |
2624 | ||
2625 | ret = get_user(bytecode_len, &bytecode->len); | |
2626 | if (ret) | |
2627 | return ret; | |
2628 | ||
2629 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2630 | GFP_KERNEL); | |
2631 | if (!bytecode_node) | |
2632 | return -ENOMEM; | |
2633 | ||
2634 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2635 | sizeof(*bytecode) + bytecode_len); | |
2636 | if (ret) | |
2637 | goto error_free; | |
2638 | ||
8a445457 | 2639 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2640 | bytecode_node->enabler = enabler; |
2641 | ||
2642 | /* Enforce length based on allocated size */ | |
2643 | bytecode_node->bc.len = bytecode_len; | |
2644 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2645 | ||
2646 | event_notifier_enabler->num_captures++; | |
2647 | ||
2648 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2649 | goto end; | |
2650 | ||
2651 | error_free: | |
2652 | lttng_kvfree(bytecode_node); | |
2653 | end: | |
2654 | return ret; | |
2655 | } | |
2656 | ||
dffef45d FD |
2657 | static |
2658 | void lttng_event_notifier_enabler_destroy( | |
2659 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2660 | { | |
2661 | if (!event_notifier_enabler) { | |
2662 | return; | |
2663 | } | |
2664 | ||
2665 | list_del(&event_notifier_enabler->node); | |
2666 | ||
2667 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2668 | kfree(event_notifier_enabler); | |
2669 | } | |
2670 | ||
3c997079 | 2671 | /* |
b2bc0bc8 | 2672 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2673 | * session. |
2674 | * Should be called with sessions mutex held. | |
2675 | */ | |
2676 | static | |
8cdc1a81 | 2677 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2678 | { |
b2bc0bc8 | 2679 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2680 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2681 | |
8cdc1a81 | 2682 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2683 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2684 | /* |
2685 | * For each event, if at least one of its enablers is enabled, | |
2686 | * and its channel and session transient states are enabled, we | |
2687 | * enable the event, else we disable it. | |
2688 | */ | |
8cdc1a81 | 2689 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2690 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2691 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2692 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2693 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2694 | int nr_filters = 0; | |
3c997079 | 2695 | |
a67ba386 | 2696 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2697 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2698 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2699 | /* Enable events */ |
2700 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2701 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2702 | if (enabler_ref->ref->enabled) { |
2703 | enabled = 1; | |
2704 | break; | |
2705 | } | |
2706 | } | |
4ecb5ad5 | 2707 | break; |
b4a75708 | 2708 | |
4ecb5ad5 | 2709 | default: |
3c997079 MD |
2710 | /* Not handled with lazy sync. */ |
2711 | continue; | |
2712 | } | |
2713 | /* | |
2714 | * Enabled state is based on union of enablers, with | |
2715 | * intesection of session and channel transient enable | |
2716 | * states. | |
2717 | */ | |
8cdc1a81 | 2718 | enabled = enabled && session->priv->tstate && event_recorder->chan->tstate; |
3c997079 | 2719 | |
a67ba386 | 2720 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2721 | /* |
2722 | * Sync tracepoint registration with event enabled | |
2723 | * state. | |
2724 | */ | |
2725 | if (enabled) { | |
a67ba386 | 2726 | register_event(event_recorder); |
3c997079 | 2727 | } else { |
a67ba386 | 2728 | _lttng_event_unregister(event_recorder); |
3c997079 | 2729 | } |
07dfc1d0 MD |
2730 | |
2731 | /* Check if has enablers without bytecode enabled */ | |
2732 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2733 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2734 | if (enabler_ref->ref->enabled |
2735 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2736 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2737 | break; |
2738 | } | |
2739 | } | |
a67ba386 | 2740 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2741 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2742 | |
2743 | /* Enable filters */ | |
2744 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2745 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2746 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2747 | nr_filters++; |
2748 | } | |
2749 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2750 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2751 | } |
2752 | } | |
2753 | ||
2754 | /* | |
2755 | * Apply enablers to session events, adding events to session if need | |
2756 | * be. It is required after each modification applied to an active | |
2757 | * session, and right before session "start". | |
2758 | * "lazy" sync means we only sync if required. | |
2759 | * Should be called with sessions mutex held. | |
2760 | */ | |
2761 | static | |
8cdc1a81 | 2762 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2763 | { |
2764 | /* We can skip if session is not active */ | |
2765 | if (!session->active) | |
2766 | return; | |
b2bc0bc8 | 2767 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2768 | } |
2769 | ||
b01155ba FD |
2770 | static |
2771 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2772 | { | |
2773 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2774 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2775 | |
2776 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2777 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2778 | ||
2779 | /* | |
2780 | * For each event_notifier, if at least one of its enablers is enabled, | |
2781 | * we enable the event_notifier, else we disable it. | |
2782 | */ | |
a67ba386 MD |
2783 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2784 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2785 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2786 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2787 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2788 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2789 | |
a67ba386 | 2790 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2791 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2792 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2793 | /* Enable event_notifiers */ |
2794 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2795 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2796 | if (enabler_ref->ref->enabled) { |
2797 | enabled = 1; | |
2798 | break; | |
2799 | } | |
2800 | } | |
2801 | break; | |
b4a75708 | 2802 | |
b01155ba FD |
2803 | default: |
2804 | /* Not handled with sync. */ | |
2805 | continue; | |
2806 | } | |
2807 | ||
a67ba386 | 2808 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2809 | /* |
2810 | * Sync tracepoint registration with event_notifier enabled | |
2811 | * state. | |
2812 | */ | |
2813 | if (enabled) { | |
a67ba386 | 2814 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2815 | register_event_notifier(event_notifier); |
2816 | } else { | |
a67ba386 | 2817 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2818 | _lttng_event_notifier_unregister(event_notifier); |
2819 | } | |
2820 | ||
2821 | /* Check if has enablers without bytecode enabled */ | |
2822 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2823 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2824 | if (enabler_ref->ref->enabled |
2825 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2826 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2827 | break; |
2828 | } | |
2829 | } | |
a67ba386 | 2830 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2831 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2832 | |
2833 | /* Enable filters */ | |
2834 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2835 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2836 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2837 | nr_filters++; |
2838 | } | |
2839 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2840 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2841 | |
2842 | /* Enable captures */ | |
2843 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2844 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2845 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2846 | nr_captures++; |
2847 | } | |
2848 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2849 | } |
2850 | } | |
2851 | ||
1ec3f75a | 2852 | /* |
d83004aa JD |
2853 | * Serialize at most one packet worth of metadata into a metadata |
2854 | * channel. | |
92d9f5e6 MD |
2855 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2856 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2857 | * allows us to do racy operations such as looking for remaining space left in | |
2858 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2859 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2860 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2861 | * Returns the number of bytes written in the channel, 0 if no data |
2862 | * was written and a negative value on error. | |
1ec3f75a | 2863 | */ |
b3b8072b | 2864 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2865 | struct channel *chan, bool *coherent) |
d83004aa | 2866 | { |
8a57ec02 | 2867 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2868 | int ret = 0; |
2869 | size_t len, reserve_len; | |
2870 | ||
f613e3e6 | 2871 | /* |
92d9f5e6 MD |
2872 | * Ensure we support mutiple get_next / put sequences followed by |
2873 | * put_next. The metadata cache lock protects reading the metadata | |
2874 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2875 | * "flush" operations on the buffer invoked by different processes. | |
2876 | * Moreover, since the metadata cache memory can be reallocated, we | |
2877 | * need to have exclusive access against updates even though we only | |
2878 | * read it. | |
f613e3e6 | 2879 | */ |
92d9f5e6 | 2880 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2881 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2882 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2883 | goto end; |
f613e3e6 | 2884 | |
9616f0bf JD |
2885 | /* Metadata regenerated, change the version. */ |
2886 | if (stream->metadata_cache->version != stream->version) | |
2887 | stream->version = stream->metadata_cache->version; | |
2888 | ||
d83004aa | 2889 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2890 | stream->metadata_in; |
9de2c215 | 2891 | if (!len) |
de23d59d | 2892 | goto end; |
d83004aa | 2893 | reserve_len = min_t(size_t, |
4a399b76 | 2894 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2895 | len); |
a775608d | 2896 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2897 | sizeof(char), NULL); |
d83004aa JD |
2898 | /* |
2899 | * If reservation failed, return an error to the caller. | |
2900 | */ | |
c2fb9c1c | 2901 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2902 | if (ret != 0) { |
2903 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2904 | stream->coherent = false; |
d83004aa JD |
2905 | goto end; |
2906 | } | |
b3b8072b | 2907 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2908 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2909 | reserve_len); |
b3b8072b | 2910 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2911 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2912 | if (reserve_len < len) |
8b97fd42 MD |
2913 | stream->coherent = false; |
2914 | else | |
2915 | stream->coherent = true; | |
d83004aa JD |
2916 | ret = reserve_len; |
2917 | ||
2918 | end: | |
8b97fd42 MD |
2919 | if (coherent) |
2920 | *coherent = stream->coherent; | |
92d9f5e6 | 2921 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2922 | return ret; |
2923 | } | |
2924 | ||
8b97fd42 | 2925 | static |
8cdc1a81 | 2926 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2927 | { |
8cdc1a81 MD |
2928 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2929 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2930 | } |
2931 | ||
2932 | static | |
8cdc1a81 | 2933 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2934 | { |
8cdc1a81 MD |
2935 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2936 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2937 | struct lttng_metadata_stream *stream; |
2938 | ||
8cdc1a81 | 2939 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2940 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2941 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2942 | } |
8b97fd42 MD |
2943 | } |
2944 | ||
d83004aa JD |
2945 | /* |
2946 | * Write the metadata to the metadata cache. | |
2947 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2948 | * The metadata cache lock protects us from concurrent read access from |
2949 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2950 | * The content of the printf is printed as a single atomic metadata |
2951 | * transaction. | |
d83004aa | 2952 | */ |
8cdc1a81 | 2953 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2954 | const char *fmt, ...) |
2955 | { | |
c099397a | 2956 | char *str; |
d83004aa | 2957 | size_t len; |
c099397a MD |
2958 | va_list ap; |
2959 | ||
585e5dcc | 2960 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2961 | |
2962 | va_start(ap, fmt); | |
2963 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2964 | va_end(ap); | |
2965 | if (!str) | |
2966 | return -ENOMEM; | |
2967 | ||
1ec3f75a | 2968 | len = strlen(str); |
8cdc1a81 MD |
2969 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2970 | if (session->priv->metadata_cache->metadata_written + len > | |
2971 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2972 | char *tmp_cache_realloc; |
2973 | unsigned int tmp_cache_alloc_size; | |
2974 | ||
2975 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2976 | session->priv->metadata_cache->cache_alloc + len, |
2977 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2978 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2979 | if (!tmp_cache_realloc) |
2980 | goto err; | |
8cdc1a81 | 2981 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2982 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2983 | session->priv->metadata_cache->data, |
2984 | session->priv->metadata_cache->cache_alloc); | |
2985 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2986 | } |
2987 | ||
8cdc1a81 MD |
2988 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2989 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2990 | } |
8cdc1a81 MD |
2991 | memcpy(session->priv->metadata_cache->data + |
2992 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2993 | str, len); |
8cdc1a81 | 2994 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2995 | kfree(str); |
d83004aa | 2996 | |
d83004aa JD |
2997 | return 0; |
2998 | ||
2999 | err: | |
3000 | kfree(str); | |
3001 | return -ENOMEM; | |
c099397a MD |
3002 | } |
3003 | ||
f513b2bf | 3004 | static |
8cdc1a81 | 3005 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3006 | { |
3007 | size_t i; | |
3008 | ||
3009 | for (i = 0; i < nesting; i++) { | |
3010 | int ret; | |
3011 | ||
3012 | ret = lttng_metadata_printf(session, " "); | |
3013 | if (ret) { | |
3014 | return ret; | |
3015 | } | |
3016 | } | |
3017 | return 0; | |
3018 | } | |
3019 | ||
ceabb767 | 3020 | static |
8cdc1a81 | 3021 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3022 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3023 | size_t nesting) |
3024 | { | |
3025 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3026 | } | |
3027 | ||
3028 | static | |
8cdc1a81 | 3029 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3030 | const struct lttng_kernel_type_integer *type, |
3031 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3032 | size_t nesting) |
3033 | { | |
3034 | int ret; | |
3035 | ||
ceabb767 MD |
3036 | ret = print_tabs(session, nesting); |
3037 | if (ret) | |
3038 | return ret; | |
3039 | ret = lttng_metadata_printf(session, | |
3040 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3041 | type->size, |
3042 | type->alignment, | |
3043 | type->signedness, | |
3044 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3045 | ? "none" |
437d5aa5 | 3046 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3047 | ? "UTF8" |
3048 | : "ASCII", | |
437d5aa5 | 3049 | type->base, |
ceabb767 | 3050 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3051 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3052 | #else |
437d5aa5 | 3053 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3054 | #endif |
3055 | ); | |
3056 | return ret; | |
3057 | } | |
3058 | ||
f513b2bf MD |
3059 | /* |
3060 | * Must be called with sessions_mutex held. | |
3061 | */ | |
3062 | static | |
8cdc1a81 | 3063 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3064 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3065 | size_t nesting) |
3066 | { | |
51ef4536 | 3067 | const char *prev_field_name = NULL; |
f513b2bf MD |
3068 | int ret; |
3069 | uint32_t i, nr_fields; | |
ceabb767 MD |
3070 | unsigned int alignment; |
3071 | ||
f513b2bf MD |
3072 | ret = print_tabs(session, nesting); |
3073 | if (ret) | |
3074 | return ret; | |
3075 | ret = lttng_metadata_printf(session, | |
3076 | "struct {\n"); | |
3077 | if (ret) | |
3078 | return ret; | |
437d5aa5 | 3079 | nr_fields = type->nr_fields; |
f513b2bf | 3080 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3081 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3082 | |
437d5aa5 | 3083 | iter_field = type->fields[i]; |
51ef4536 | 3084 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3085 | if (ret) |
3086 | return ret; | |
3087 | } | |
3088 | ret = print_tabs(session, nesting); | |
3089 | if (ret) | |
3090 | return ret; | |
437d5aa5 | 3091 | alignment = type->alignment; |
ceabb767 MD |
3092 | if (alignment) { |
3093 | ret = lttng_metadata_printf(session, | |
3094 | "} align(%u)", | |
3095 | alignment); | |
3096 | } else { | |
3097 | ret = lttng_metadata_printf(session, | |
3098 | "}"); | |
3099 | } | |
f513b2bf MD |
3100 | return ret; |
3101 | } | |
3102 | ||
3103 | /* | |
3104 | * Must be called with sessions_mutex held. | |
3105 | */ | |
3106 | static | |
8cdc1a81 | 3107 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3108 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3109 | size_t nesting) |
3110 | { | |
3111 | int ret; | |
3112 | ||
3113 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3114 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3115 | if (ret) |
3116 | return ret; | |
ceabb767 | 3117 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3118 | } |
3119 | ||
65c85aa6 MD |
3120 | /* |
3121 | * Must be called with sessions_mutex held. | |
3122 | */ | |
3123 | static | |
8cdc1a81 | 3124 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3125 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3126 | size_t nesting, |
3127 | const char *prev_field_name) | |
65c85aa6 | 3128 | { |
51ef4536 | 3129 | const char *tag_name; |
65c85aa6 MD |
3130 | int ret; |
3131 | uint32_t i, nr_choices; | |
3132 | ||
51ef4536 MD |
3133 | tag_name = type->tag_name; |
3134 | if (!tag_name) | |
3135 | tag_name = prev_field_name; | |
3136 | if (!tag_name) | |
3137 | return -EINVAL; | |
ceabb767 MD |
3138 | /* |
3139 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3140 | */ | |
437d5aa5 | 3141 | if (type->alignment != 0) |
ceabb767 | 3142 | return -EINVAL; |
65c85aa6 MD |
3143 | ret = print_tabs(session, nesting); |
3144 | if (ret) | |
3145 | return ret; | |
3146 | ret = lttng_metadata_printf(session, | |
3147 | "variant <_%s> {\n", | |
51ef4536 | 3148 | tag_name); |
65c85aa6 MD |
3149 | if (ret) |
3150 | return ret; | |
437d5aa5 | 3151 | nr_choices = type->nr_choices; |
65c85aa6 | 3152 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3153 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3154 | |
437d5aa5 | 3155 | iter_field = type->choices[i]; |
51ef4536 | 3156 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3157 | if (ret) |
3158 | return ret; | |
3159 | } | |
3160 | ret = print_tabs(session, nesting); | |
3161 | if (ret) | |
3162 | return ret; | |
3163 | ret = lttng_metadata_printf(session, | |
3164 | "}"); | |
3165 | return ret; | |
3166 | } | |
3167 | ||
3168 | /* | |
3169 | * Must be called with sessions_mutex held. | |
3170 | */ | |
3171 | static | |
8cdc1a81 | 3172 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3173 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3174 | size_t nesting, |
3175 | const char *prev_field_name) | |
65c85aa6 MD |
3176 | { |
3177 | int ret; | |
3178 | ||
3179 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3180 | lttng_kernel_get_type_variant(field->type), nesting, |
3181 | prev_field_name); | |
65c85aa6 MD |
3182 | if (ret) |
3183 | return ret; | |
ceabb767 | 3184 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3185 | } |
3186 | ||
f513b2bf MD |
3187 | /* |
3188 | * Must be called with sessions_mutex held. | |
3189 | */ | |
3190 | static | |
8cdc1a81 | 3191 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3192 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3193 | size_t nesting) |
3194 | { | |
3195 | int ret; | |
437d5aa5 MD |
3196 | const struct lttng_kernel_type_array *array_type; |
3197 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3198 | |
437d5aa5 MD |
3199 | array_type = lttng_kernel_get_type_array(field->type); |
3200 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3201 | |
437d5aa5 | 3202 | if (array_type->alignment) { |
ceabb767 | 3203 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3204 | if (ret) |
3205 | return ret; | |
ceabb767 MD |
3206 | ret = lttng_metadata_printf(session, |
3207 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3208 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3209 | field->name); |
3210 | if (ret) | |
3211 | return ret; | |
3212 | } | |
3213 | /* | |
3214 | * Nested compound types: Only array of structures and variants are | |
3215 | * currently supported. | |
3216 | */ | |
437d5aa5 | 3217 | elem_type = array_type->elem_type; |
12bb2edb MD |
3218 | switch (elem_type->type) { |
3219 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3220 | case lttng_kernel_type_struct: |
3221 | case lttng_kernel_type_variant: | |
3222 | ret = _lttng_type_statedump(session, elem_type, | |
3223 | array_type->encoding, nesting); | |
65c85aa6 MD |
3224 | if (ret) |
3225 | return ret; | |
3226 | break; | |
ceabb767 | 3227 | |
f513b2bf MD |
3228 | default: |
3229 | return -EINVAL; | |
3230 | } | |
3231 | ret = lttng_metadata_printf(session, | |
3232 | " _%s[%u];\n", | |
3233 | field->name, | |
437d5aa5 | 3234 | array_type->length); |
f513b2bf MD |
3235 | return ret; |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * Must be called with sessions_mutex held. | |
3240 | */ | |
3241 | static | |
8cdc1a81 | 3242 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3243 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3244 | size_t nesting, |
3245 | const char *prev_field_name) | |
f513b2bf MD |
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; |
51ef4536 MD |
3256 | if (!length_name) |
3257 | length_name = prev_field_name; | |
3258 | if (!length_name) | |
3259 | return -EINVAL; | |
ceabb767 | 3260 | |
437d5aa5 | 3261 | if (sequence_type->alignment) { |
ceabb767 | 3262 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3263 | if (ret) |
3264 | return ret; | |
ceabb767 MD |
3265 | ret = lttng_metadata_printf(session, |
3266 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3267 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3268 | field->name); |
3269 | if (ret) | |
3270 | return ret; | |
3271 | } | |
3272 | ||
3273 | /* | |
3274 | * Nested compound types: Only array of structures and variants are | |
3275 | * currently supported. | |
3276 | */ | |
437d5aa5 | 3277 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3278 | switch (elem_type->type) { |
3279 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3280 | case lttng_kernel_type_struct: |
3281 | case lttng_kernel_type_variant: | |
3282 | ret = _lttng_type_statedump(session, elem_type, | |
3283 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3284 | if (ret) |
3285 | return ret; | |
3286 | break; | |
ceabb767 | 3287 | |
f513b2bf MD |
3288 | default: |
3289 | return -EINVAL; | |
3290 | } | |
3291 | ret = lttng_metadata_printf(session, | |
3292 | " _%s[ _%s ];\n", | |
3293 | field->name, | |
51ef4536 | 3294 | length_name); |
f513b2bf MD |
3295 | return ret; |
3296 | } | |
3297 | ||
141ddf28 MD |
3298 | /* |
3299 | * Must be called with sessions_mutex held. | |
3300 | */ | |
3301 | static | |
8cdc1a81 | 3302 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3303 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3304 | size_t nesting) |
3305 | { | |
d96a4a7a | 3306 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3307 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3308 | int ret; |
3309 | unsigned int i, nr_entries; | |
3310 | ||
437d5aa5 | 3311 | container_type = type->container_type; |
12bb2edb | 3312 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3313 | ret = -EINVAL; |
3314 | goto end; | |
3315 | } | |
437d5aa5 | 3316 | enum_desc = type->desc; |
141ddf28 MD |
3317 | nr_entries = enum_desc->nr_entries; |
3318 | ||
3319 | ret = print_tabs(session, nesting); | |
3320 | if (ret) | |
3321 | goto end; | |
ceabb767 MD |
3322 | ret = lttng_metadata_printf(session, "enum : "); |
3323 | if (ret) | |
3324 | goto end; | |
437d5aa5 MD |
3325 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3326 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3327 | if (ret) |
ceabb767 MD |
3328 | goto end; |
3329 | ret = lttng_metadata_printf(session, " {\n"); | |
3330 | if (ret) | |
3331 | goto end; | |
141ddf28 MD |
3332 | /* Dump all entries */ |
3333 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3334 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3335 | int j, len; |
3336 | ||
3337 | ret = print_tabs(session, nesting + 1); | |
3338 | if (ret) | |
3339 | goto end; | |
3340 | ret = lttng_metadata_printf(session, | |
3341 | "\""); | |
3342 | if (ret) | |
3343 | goto end; | |
3344 | len = strlen(entry->string); | |
3345 | /* Escape the character '"' */ | |
3346 | for (j = 0; j < len; j++) { | |
3347 | char c = entry->string[j]; | |
3348 | ||
3349 | switch (c) { | |
3350 | case '"': | |
3351 | ret = lttng_metadata_printf(session, | |
3352 | "\\\""); | |
3353 | break; | |
3354 | case '\\': | |
3355 | ret = lttng_metadata_printf(session, | |
3356 | "\\\\"); | |
3357 | break; | |
3358 | default: | |
3359 | ret = lttng_metadata_printf(session, | |
3360 | "%c", c); | |
3361 | break; | |
3362 | } | |
3363 | if (ret) | |
3364 | goto end; | |
3365 | } | |
08ad1061 PP |
3366 | ret = lttng_metadata_printf(session, "\""); |
3367 | if (ret) | |
3368 | goto end; | |
3369 | ||
3370 | if (entry->options.is_auto) { | |
3371 | ret = lttng_metadata_printf(session, ",\n"); | |
3372 | if (ret) | |
3373 | goto end; | |
141ddf28 | 3374 | } else { |
7c559490 MD |
3375 | ret = lttng_metadata_printf(session, |
3376 | " = "); | |
3377 | if (ret) | |
3378 | goto end; | |
3379 | if (entry->start.signedness) | |
141ddf28 | 3380 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3381 | "%lld", (long long) entry->start.value); |
3382 | else | |
3383 | ret = lttng_metadata_printf(session, | |
3384 | "%llu", entry->start.value); | |
3385 | if (ret) | |
3386 | goto end; | |
3387 | if (entry->start.signedness == entry->end.signedness && | |
3388 | entry->start.value | |
3389 | == entry->end.value) { | |
141ddf28 | 3390 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3391 | ",\n"); |
3392 | } else { | |
3393 | if (entry->end.signedness) { | |
3394 | ret = lttng_metadata_printf(session, | |
3395 | " ... %lld,\n", | |
3396 | (long long) entry->end.value); | |
3397 | } else { | |
3398 | ret = lttng_metadata_printf(session, | |
3399 | " ... %llu,\n", | |
3400 | entry->end.value); | |
3401 | } | |
141ddf28 | 3402 | } |
7c559490 MD |
3403 | if (ret) |
3404 | goto end; | |
141ddf28 | 3405 | } |
141ddf28 MD |
3406 | } |
3407 | ret = print_tabs(session, nesting); | |
3408 | if (ret) | |
3409 | goto end; | |
ceabb767 | 3410 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3411 | end: |
3412 | return ret; | |
3413 | } | |
3414 | ||
d83004aa JD |
3415 | /* |
3416 | * Must be called with sessions_mutex held. | |
3417 | */ | |
c099397a | 3418 | static |
8cdc1a81 | 3419 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3420 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3421 | size_t nesting) |
3422 | { | |
3423 | int ret; | |
437d5aa5 | 3424 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3425 | |
437d5aa5 MD |
3426 | enum_type = lttng_kernel_get_type_enum(field->type); |
3427 | WARN_ON_ONCE(!enum_type); | |
3428 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3429 | if (ret) |
3430 | return ret; | |
3431 | return lttng_field_name_statedump(session, field, nesting); | |
3432 | } | |
3433 | ||
3434 | static | |
8cdc1a81 | 3435 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3436 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3437 | size_t nesting) |
3438 | { | |
3439 | int ret; | |
3440 | ||
437d5aa5 MD |
3441 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3442 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3443 | if (ret) |
3444 | return ret; | |
3445 | return lttng_field_name_statedump(session, field, nesting); | |
3446 | } | |
3447 | ||
3448 | static | |
8cdc1a81 | 3449 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3450 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3451 | size_t nesting) |
3452 | { | |
3453 | int ret; | |
3454 | ||
ceabb767 MD |
3455 | /* Default encoding is UTF8 */ |
3456 | ret = print_tabs(session, nesting); | |
3457 | if (ret) | |
3458 | return ret; | |
3459 | ret = lttng_metadata_printf(session, | |
3460 | "string%s", | |
437d5aa5 | 3461 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3462 | " { encoding = ASCII; }" : ""); |
3463 | return ret; | |
3464 | } | |
3465 | ||
3466 | static | |
8cdc1a81 | 3467 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3468 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3469 | size_t nesting) |
ceabb767 | 3470 | { |
437d5aa5 | 3471 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3472 | int ret; |
3473 | ||
437d5aa5 MD |
3474 | string_type = lttng_kernel_get_type_string(field->type); |
3475 | WARN_ON_ONCE(!string_type); | |
3476 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3477 | if (ret) |
3478 | return ret; | |
3479 | return lttng_field_name_statedump(session, field, nesting); | |
3480 | } | |
3481 | ||
3482 | /* | |
3483 | * Must be called with sessions_mutex held. | |
3484 | */ | |
3485 | static | |
8cdc1a81 | 3486 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3487 | const struct lttng_kernel_type_common *type, |
3488 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3489 | size_t nesting) |
c099397a | 3490 | { |
c099397a | 3491 | int ret = 0; |
c099397a | 3492 | |
12bb2edb MD |
3493 | switch (type->type) { |
3494 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3495 | ret = _lttng_integer_type_statedump(session, |
3496 | lttng_kernel_get_type_integer(type), | |
3497 | parent_encoding, nesting); | |
8070f5c0 | 3498 | break; |
437d5aa5 MD |
3499 | case lttng_kernel_type_enum: |
3500 | ret = _lttng_enum_type_statedump(session, | |
3501 | lttng_kernel_get_type_enum(type), | |
3502 | nesting); | |
8070f5c0 | 3503 | break; |
12bb2edb | 3504 | case lttng_kernel_type_string: |
437d5aa5 MD |
3505 | ret = _lttng_string_type_statedump(session, |
3506 | lttng_kernel_get_type_string(type), | |
3507 | nesting); | |
ceabb767 | 3508 | break; |
437d5aa5 MD |
3509 | case lttng_kernel_type_struct: |
3510 | ret = _lttng_struct_type_statedump(session, | |
3511 | lttng_kernel_get_type_struct(type), | |
3512 | nesting); | |
8070f5c0 | 3513 | break; |
437d5aa5 MD |
3514 | case lttng_kernel_type_variant: |
3515 | ret = _lttng_variant_type_statedump(session, | |
3516 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3517 | nesting, NULL); |
ceabb767 MD |
3518 | break; |
3519 | ||
3520 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3521 | case lttng_kernel_type_array: |
3522 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3523 | default: |
3524 | WARN_ON_ONCE(1); | |
3525 | return -EINVAL; | |
8070f5c0 | 3526 | } |
ceabb767 MD |
3527 | return ret; |
3528 | } | |
8070f5c0 | 3529 | |
ceabb767 MD |
3530 | /* |
3531 | * Must be called with sessions_mutex held. | |
3532 | */ | |
3533 | static | |
8cdc1a81 | 3534 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3535 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3536 | size_t nesting, |
3537 | const char **prev_field_name_p) | |
ceabb767 | 3538 | { |
51ef4536 | 3539 | const char *prev_field_name = NULL; |
ceabb767 | 3540 | int ret = 0; |
27d2368e | 3541 | |
51ef4536 MD |
3542 | if (prev_field_name_p) |
3543 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3544 | switch (field->type->type) { |
12bb2edb | 3545 | case lttng_kernel_type_integer: |
ceabb767 MD |
3546 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3547 | break; | |
437d5aa5 | 3548 | case lttng_kernel_type_enum: |
ceabb767 | 3549 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3550 | break; |
12bb2edb | 3551 | case lttng_kernel_type_string: |
ceabb767 | 3552 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3553 | break; |
437d5aa5 | 3554 | case lttng_kernel_type_struct: |
ceabb767 | 3555 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3556 | break; |
437d5aa5 | 3557 | case lttng_kernel_type_array: |
ceabb767 | 3558 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3559 | break; |
437d5aa5 | 3560 | case lttng_kernel_type_sequence: |
51ef4536 | 3561 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3562 | break; |
437d5aa5 | 3563 | case lttng_kernel_type_variant: |
51ef4536 | 3564 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3565 | break; |
f513b2bf | 3566 | |
8070f5c0 MD |
3567 | default: |
3568 | WARN_ON_ONCE(1); | |
3569 | return -EINVAL; | |
3570 | } | |
51ef4536 MD |
3571 | if (prev_field_name_p) |
3572 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3573 | return ret; |
3574 | } | |
3575 | ||
3576 | static | |
8cdc1a81 | 3577 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3578 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3579 | { |
51ef4536 | 3580 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3581 | int ret = 0; |
3582 | int i; | |
3583 | ||
3584 | if (!ctx) | |
3585 | return 0; | |
3586 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3587 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3588 | |
51ef4536 | 3589 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3590 | if (ret) |
3591 | return ret; | |
3592 | } | |
3593 | return ret; | |
3594 | } | |
3595 | ||
3596 | static | |
8cdc1a81 | 3597 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3598 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3599 | { |
51ef4536 | 3600 | const char *prev_field_name = NULL; |
a67ba386 | 3601 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3602 | int ret = 0; |
3603 | int i; | |
3604 | ||
3605 | for (i = 0; i < desc->nr_fields; i++) { | |
437d5aa5 | 3606 | const struct lttng_kernel_event_field *field = desc->fields[i]; |
8070f5c0 | 3607 | |
51ef4536 | 3608 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3609 | if (ret) |
3610 | return ret; | |
c099397a MD |
3611 | } |
3612 | return ret; | |
3613 | } | |
3614 | ||
d83004aa JD |
3615 | /* |
3616 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3617 | * The entire event metadata is printed as a single atomic metadata |
3618 | * transaction. | |
d83004aa | 3619 | */ |
c099397a | 3620 | static |
8cdc1a81 | 3621 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
a90917c3 | 3622 | struct lttng_channel *chan, |
a67ba386 | 3623 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3624 | { |
3625 | int ret = 0; | |
3626 | ||
a67ba386 | 3627 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3628 | return 0; |
d83004aa | 3629 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3630 | return 0; |
3631 | ||
8b97fd42 MD |
3632 | lttng_metadata_begin(session); |
3633 | ||
c099397a MD |
3634 | ret = lttng_metadata_printf(session, |
3635 | "event {\n" | |
ae734547 | 3636 | " name = \"%s\";\n" |
c099397a | 3637 | " id = %u;\n" |
b9074a1b | 3638 | " stream_id = %u;\n", |
a67ba386 MD |
3639 | event_recorder->priv->parent.desc->event_name, |
3640 | event_recorder->priv->id, | |
3641 | event_recorder->chan->id); | |
c099397a MD |
3642 | if (ret) |
3643 | goto end; | |
3644 | ||
8070f5c0 | 3645 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3646 | " fields := struct {\n" |
3647 | ); | |
3648 | if (ret) | |
3649 | goto end; | |
3650 | ||
a67ba386 | 3651 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3652 | if (ret) |
3653 | goto end; | |
3654 | ||
3655 | /* | |
3656 | * LTTng space reservation can only reserve multiples of the | |
3657 | * byte size. | |
3658 | */ | |
3659 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3660 | " };\n" |
3661 | "};\n\n"); | |
c099397a MD |
3662 | if (ret) |
3663 | goto end; | |
3664 | ||
a67ba386 | 3665 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3666 | end: |
8b97fd42 | 3667 | lttng_metadata_end(session); |
c099397a MD |
3668 | return ret; |
3669 | ||
3670 | } | |
3671 | ||
d83004aa JD |
3672 | /* |
3673 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3674 | * The entire channel metadata is printed as a single atomic metadata |
3675 | * transaction. | |
d83004aa | 3676 | */ |
c099397a | 3677 | static |
8cdc1a81 | 3678 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
a90917c3 | 3679 | struct lttng_channel *chan) |
c099397a MD |
3680 | { |
3681 | int ret = 0; | |
3682 | ||
585e5dcc | 3683 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3684 | return 0; |
d83004aa JD |
3685 | |
3686 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3687 | return 0; |
3688 | ||
8b97fd42 MD |
3689 | lttng_metadata_begin(session); |
3690 | ||
c099397a MD |
3691 | WARN_ON_ONCE(!chan->header_type); |
3692 | ret = lttng_metadata_printf(session, | |
3693 | "stream {\n" | |
3694 | " id = %u;\n" | |
9115fbdc | 3695 | " event.header := %s;\n" |
b9074a1b | 3696 | " packet.context := struct packet_context;\n", |
c099397a MD |
3697 | chan->id, |
3698 | chan->header_type == 1 ? "struct event_header_compact" : | |
3699 | "struct event_header_large"); | |
3700 | if (ret) | |
3701 | goto end; | |
3702 | ||
b9074a1b MD |
3703 | if (chan->ctx) { |
3704 | ret = lttng_metadata_printf(session, | |
3705 | " event.context := struct {\n"); | |
3706 | if (ret) | |
3707 | goto end; | |
3708 | } | |
a90917c3 | 3709 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3710 | if (ret) |
3711 | goto end; | |
b9074a1b MD |
3712 | if (chan->ctx) { |
3713 | ret = lttng_metadata_printf(session, | |
3714 | " };\n"); | |
3715 | if (ret) | |
3716 | goto end; | |
3717 | } | |
8070f5c0 MD |
3718 | |
3719 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3720 | "};\n\n"); |
8070f5c0 | 3721 | |
c099397a MD |
3722 | chan->metadata_dumped = 1; |
3723 | end: | |
8b97fd42 | 3724 | lttng_metadata_end(session); |
c099397a MD |
3725 | return ret; |
3726 | } | |
3727 | ||
d83004aa JD |
3728 | /* |
3729 | * Must be called with sessions_mutex held. | |
3730 | */ | |
9115fbdc | 3731 | static |
8cdc1a81 | 3732 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3733 | { |
3734 | return lttng_metadata_printf(session, | |
3735 | "struct packet_context {\n" | |
a3ccff4f MD |
3736 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3737 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3738 | " uint64_t content_size;\n" |
3739 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3740 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3741 | " unsigned long events_discarded;\n" |
9115fbdc | 3742 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3743 | "};\n\n" |
9115fbdc MD |
3744 | ); |
3745 | } | |
3746 | ||
3747 | /* | |
3748 | * Compact header: | |
3749 | * id: range: 0 - 30. | |
3750 | * id 31 is reserved to indicate an extended header. | |
3751 | * | |
3752 | * Large header: | |
3753 | * id: range: 0 - 65534. | |
3754 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3755 | * |
3756 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3757 | */ |
3758 | static | |
8cdc1a81 | 3759 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3760 | { |
3761 | return lttng_metadata_printf(session, | |
3762 | "struct event_header_compact {\n" | |
3763 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3764 | " variant <id> {\n" | |
3765 | " struct {\n" | |
a3ccff4f | 3766 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3767 | " } compact;\n" |
3768 | " struct {\n" | |
3769 | " uint32_t id;\n" | |
a3ccff4f | 3770 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3771 | " } extended;\n" |
3772 | " } v;\n" | |
3773 | "} align(%u);\n" | |
3774 | "\n" | |
3775 | "struct event_header_large {\n" | |
3776 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3777 | " variant <id> {\n" | |
3778 | " struct {\n" | |
a3ccff4f | 3779 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3780 | " } compact;\n" |
3781 | " struct {\n" | |
3782 | " uint32_t id;\n" | |
a3ccff4f | 3783 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3784 | " } extended;\n" |
3785 | " } v;\n" | |
3786 | "} align(%u);\n\n", | |
a90917c3 MD |
3787 | lttng_alignof(uint32_t) * CHAR_BIT, |
3788 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3789 | ); |
3790 | } | |
3791 | ||
a3ccff4f MD |
3792 | /* |
3793 | * Approximation of NTP time of day to clock monotonic correlation, | |
3794 | * taken at start of trace. | |
3795 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3796 | * in future versions. | |
5283350b MD |
3797 | * This function may return a negative offset. It may happen if the |
3798 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3799 | * |
3800 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3801 | * y2038 compliant. | |
a3ccff4f MD |
3802 | */ |
3803 | static | |
8967b2a3 | 3804 | int64_t measure_clock_offset(void) |
a3ccff4f | 3805 | { |
dcb93448 | 3806 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3807 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3808 | int64_t offset; |
a3ccff4f | 3809 | unsigned long flags; |
3636085f MJ |
3810 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3811 | struct timespec64 rts = { 0, 0 }; | |
3812 | #else | |
3813 | struct timespec rts = { 0, 0 }; | |
3814 | #endif | |
a3ccff4f MD |
3815 | |
3816 | /* Disable interrupts to increase correlation precision. */ | |
3817 | local_irq_save(flags); | |
3818 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3819 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3820 | ktime_get_real_ts64(&rts); | |
3821 | #else | |
216b6baa | 3822 | getnstimeofday(&rts); |
3636085f | 3823 | #endif |
a3ccff4f MD |
3824 | monotonic[1] = trace_clock_read64(); |
3825 | local_irq_restore(flags); | |
3826 | ||
dcb93448 | 3827 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3828 | realtime = (uint64_t) rts.tv_sec * tcf; |
3829 | if (tcf == NSEC_PER_SEC) { | |
3830 | realtime += rts.tv_nsec; | |
3831 | } else { | |
3832 | uint64_t n = rts.tv_nsec * tcf; | |
3833 | ||
3834 | do_div(n, NSEC_PER_SEC); | |
3835 | realtime += n; | |
3836 | } | |
dcb93448 | 3837 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3838 | return offset; |
3839 | } | |
3840 | ||
3eb95be4 | 3841 | static |
8cdc1a81 | 3842 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3843 | { |
0f3eaad4 | 3844 | int ret = 0; |
3eb95be4 JR |
3845 | size_t i; |
3846 | char cur; | |
3847 | ||
3848 | i = 0; | |
3849 | cur = string[i]; | |
3850 | while (cur != '\0') { | |
3851 | switch (cur) { | |
3852 | case '\n': | |
3853 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3854 | break; | |
3855 | case '\\': | |
3856 | case '"': | |
3857 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3858 | if (ret) | |
3859 | goto error; | |
3860 | /* We still print the current char */ | |
3861 | /* Fallthrough */ | |
3862 | default: | |
3863 | ret = lttng_metadata_printf(session, "%c", cur); | |
3864 | break; | |
3865 | } | |
3866 | ||
3867 | if (ret) | |
3868 | goto error; | |
3869 | ||
3870 | cur = string[++i]; | |
3871 | } | |
3872 | error: | |
3873 | return ret; | |
3874 | } | |
3875 | ||
3876 | static | |
8cdc1a81 | 3877 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3878 | const char *field_value) |
3eb95be4 JR |
3879 | { |
3880 | int ret; | |
3881 | ||
1c88f269 | 3882 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3883 | if (ret) |
3884 | goto error; | |
3885 | ||
1c88f269 | 3886 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3887 | if (ret) |
3888 | goto error; | |
3889 | ||
3890 | ret = lttng_metadata_printf(session, "\";\n"); | |
3891 | ||
3892 | error: | |
3893 | return ret; | |
3894 | } | |
3895 | ||
c099397a MD |
3896 | /* |
3897 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3898 | * Must be called with sessions_mutex held. |
c099397a MD |
3899 | */ |
3900 | static | |
8cdc1a81 | 3901 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3902 | { |
8cdc1a81 | 3903 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3904 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3905 | const char *product_uuid; |
a90917c3 | 3906 | struct lttng_channel *chan; |
a67ba386 | 3907 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3908 | int ret = 0; |
3909 | ||
585e5dcc | 3910 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3911 | return 0; |
8b97fd42 MD |
3912 | |
3913 | lttng_metadata_begin(session); | |
3914 | ||
8cdc1a81 | 3915 | if (session->priv->metadata_dumped) |
c099397a | 3916 | goto skip_session; |
c099397a | 3917 | |
d793d5e1 | 3918 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3919 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3920 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3921 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3922 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3923 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3924 | |
3925 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3926 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3927 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3928 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3929 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3930 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3931 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3932 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3933 | "\n" |
3934 | "trace {\n" | |
3935 | " major = %u;\n" | |
3936 | " minor = %u;\n" | |
30bdb6e4 | 3937 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3938 | " byte_order = %s;\n" |
3939 | " packet.header := struct {\n" | |
3940 | " uint32_t magic;\n" | |
1ec3f75a | 3941 | " uint8_t uuid[16];\n" |
d793d5e1 | 3942 | " uint32_t stream_id;\n" |
5594698f | 3943 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3944 | " };\n" |
d793d5e1 | 3945 | "};\n\n", |
a90917c3 MD |
3946 | lttng_alignof(uint8_t) * CHAR_BIT, |
3947 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3948 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3949 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3950 | sizeof(unsigned long) * CHAR_BIT, |
3951 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3952 | CTF_SPEC_MAJOR, |
3953 | CTF_SPEC_MINOR, | |
d793d5e1 | 3954 | uuid_s, |
5214fa50 | 3955 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3956 | "be" |
3957 | #else | |
3958 | "le" | |
3959 | #endif | |
3960 | ); | |
3961 | if (ret) | |
3962 | goto end; | |
3963 | ||
99dc9597 MD |
3964 | ret = lttng_metadata_printf(session, |
3965 | "env {\n" | |
a6058143 | 3966 | " hostname = \"%s\";\n" |
c6c9e10f | 3967 | " domain = \"kernel\";\n" |
99dc9597 | 3968 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3969 | " kernel_release = \"%s\";\n" |
3970 | " kernel_version = \"%s\";\n" | |
3971 | " tracer_name = \"lttng-modules\";\n" | |
3972 | " tracer_major = %d;\n" | |
3973 | " tracer_minor = %d;\n" | |
3974 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3975 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3976 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3977 | utsname()->sysname, |
3978 | utsname()->release, | |
c6c9e10f MD |
3979 | utsname()->version, |
3980 | LTTNG_MODULES_MAJOR_VERSION, | |
3981 | LTTNG_MODULES_MINOR_VERSION, | |
3982 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3983 | ); |
3984 | if (ret) | |
3985 | goto end; | |
3986 | ||
8cdc1a81 | 3987 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3988 | if (ret) |
3989 | goto end; | |
3990 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3991 | session->priv->creation_time); |
3eb95be4 JR |
3992 | if (ret) |
3993 | goto end; | |
3994 | ||
c88f762e GB |
3995 | /* Add the product UUID to the 'env' section */ |
3996 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3997 | if (product_uuid) { | |
3998 | ret = lttng_metadata_printf(session, | |
3999 | " product_uuid = \"%s\";\n", | |
4000 | product_uuid | |
4001 | ); | |
4002 | if (ret) | |
4003 | goto end; | |
4004 | } | |
4005 | ||
4006 | /* Close the 'env' section */ | |
3eb95be4 JR |
4007 | ret = lttng_metadata_printf(session, "};\n\n"); |
4008 | if (ret) | |
4009 | goto end; | |
4010 | ||
a3ccff4f MD |
4011 | ret = lttng_metadata_printf(session, |
4012 | "clock {\n" | |
2754583e MD |
4013 | " name = \"%s\";\n", |
4014 | trace_clock_name() | |
a82c63f1 MD |
4015 | ); |
4016 | if (ret) | |
4017 | goto end; | |
4018 | ||
4019 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4020 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4021 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4022 | clock_uuid_s |
4023 | ); | |
4024 | if (ret) | |
4025 | goto end; | |
4026 | } | |
4027 | ||
4028 | ret = lttng_metadata_printf(session, | |
2754583e | 4029 | " description = \"%s\";\n" |
a3ccff4f MD |
4030 | " freq = %llu; /* Frequency, in Hz */\n" |
4031 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4032 | " offset = %lld;\n" |
a3ccff4f | 4033 | "};\n\n", |
2754583e | 4034 | trace_clock_description(), |
a3ccff4f | 4035 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4036 | (long long) measure_clock_offset() |
a3ccff4f MD |
4037 | ); |
4038 | if (ret) | |
4039 | goto end; | |
4040 | ||
4041 | ret = lttng_metadata_printf(session, | |
4042 | "typealias integer {\n" | |
4043 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4044 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4045 | "} := uint27_clock_monotonic_t;\n" |
4046 | "\n" | |
4047 | "typealias integer {\n" | |
4048 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4049 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4050 | "} := uint32_clock_monotonic_t;\n" |
4051 | "\n" | |
4052 | "typealias integer {\n" | |
4053 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4054 | " map = clock.%s.value;\n" |
a3ccff4f | 4055 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4056 | trace_clock_name(), |
a3ccff4f | 4057 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4058 | trace_clock_name(), |
4059 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4060 | trace_clock_name() | |
a3ccff4f MD |
4061 | ); |
4062 | if (ret) | |
4063 | goto end; | |
4064 | ||
a90917c3 | 4065 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4066 | if (ret) |
4067 | goto end; | |
4068 | ||
a90917c3 | 4069 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4070 | if (ret) |
4071 | goto end; | |
4072 | ||
c099397a | 4073 | skip_session: |
8cdc1a81 | 4074 | list_for_each_entry(chan, &session->priv->chan, list) { |
a90917c3 | 4075 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4076 | if (ret) |
4077 | goto end; | |
4078 | } | |
4079 | ||
8cdc1a81 | 4080 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4081 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4082 | event_recorder_priv->pub); | |
c099397a MD |
4083 | if (ret) |
4084 | goto end; | |
4085 | } | |
8cdc1a81 | 4086 | session->priv->metadata_dumped = 1; |
c099397a | 4087 | end: |
8b97fd42 | 4088 | lttng_metadata_end(session); |
c099397a MD |
4089 | return ret; |
4090 | } | |
4091 | ||
c0e31d2e | 4092 | /** |
a90917c3 | 4093 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4094 | * @transport: transport structure |
4095 | * | |
4096 | * Registers a transport which can be used as output to extract the data out of | |
4097 | * LTTng. The module calling this registration function must ensure that no | |
4098 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4099 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4100 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4101 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4102 | * after its registration must it synchronize the TLBs. |
4103 | */ | |
a90917c3 | 4104 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4105 | { |
4106 | /* | |
4107 | * Make sure no page fault can be triggered by the module about to be | |
4108 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4109 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4110 | */ |
263b6c88 | 4111 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4112 | |
4113 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4114 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4115 | mutex_unlock(&sessions_mutex); |
4116 | } | |
a90917c3 | 4117 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4118 | |
4119 | /** | |
a90917c3 | 4120 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4121 | * @transport: transport structure |
4122 | */ | |
a90917c3 | 4123 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4124 | { |
4125 | mutex_lock(&sessions_mutex); | |
4126 | list_del(&transport->node); | |
4127 | mutex_unlock(&sessions_mutex); | |
4128 | } | |
a90917c3 | 4129 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4130 | |
a101fa10 MD |
4131 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4132 | { | |
4133 | /* | |
4134 | * Make sure no page fault can be triggered by the module about to be | |
4135 | * registered. We deal with this here so we don't have to call | |
4136 | * vmalloc_sync_mappings() in each module's init. | |
4137 | */ | |
4138 | wrapper_vmalloc_sync_mappings(); | |
4139 | ||
4140 | mutex_lock(&sessions_mutex); | |
4141 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4142 | mutex_unlock(&sessions_mutex); | |
4143 | } | |
4144 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4145 | ||
4146 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4147 | { | |
4148 | mutex_lock(&sessions_mutex); | |
4149 | list_del(&transport->node); | |
4150 | mutex_unlock(&sessions_mutex); | |
4151 | } | |
4152 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4153 | ||
5f4c791e | 4154 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4155 | |
4156 | enum cpuhp_state lttng_hp_prepare; | |
4157 | enum cpuhp_state lttng_hp_online; | |
4158 | ||
4159 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4160 | { | |
4161 | struct lttng_cpuhp_node *lttng_node; | |
4162 | ||
4163 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4164 | switch (lttng_node->component) { | |
4165 | case LTTNG_RING_BUFFER_FRONTEND: | |
4166 | return 0; | |
4167 | case LTTNG_RING_BUFFER_BACKEND: | |
4168 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4169 | case LTTNG_RING_BUFFER_ITER: | |
4170 | return 0; | |
4171 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4172 | return 0; | |
4173 | default: | |
4174 | return -EINVAL; | |
4175 | } | |
4176 | } | |
4177 | ||
4178 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4179 | { | |
4180 | struct lttng_cpuhp_node *lttng_node; | |
4181 | ||
4182 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4183 | switch (lttng_node->component) { | |
4184 | case LTTNG_RING_BUFFER_FRONTEND: | |
4185 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4186 | case LTTNG_RING_BUFFER_BACKEND: | |
4187 | return 0; | |
4188 | case LTTNG_RING_BUFFER_ITER: | |
4189 | return 0; | |
4190 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4191 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4192 | default: | |
4193 | return -EINVAL; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4198 | { | |
4199 | struct lttng_cpuhp_node *lttng_node; | |
4200 | ||
4201 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4202 | switch (lttng_node->component) { | |
4203 | case LTTNG_RING_BUFFER_FRONTEND: | |
4204 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4205 | case LTTNG_RING_BUFFER_BACKEND: | |
4206 | return 0; | |
4207 | case LTTNG_RING_BUFFER_ITER: | |
4208 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4209 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4210 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4211 | default: | |
4212 | return -EINVAL; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4217 | { | |
4218 | struct lttng_cpuhp_node *lttng_node; | |
4219 | ||
4220 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4221 | switch (lttng_node->component) { | |
4222 | case LTTNG_RING_BUFFER_FRONTEND: | |
4223 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4224 | case LTTNG_RING_BUFFER_BACKEND: | |
4225 | return 0; | |
4226 | case LTTNG_RING_BUFFER_ITER: | |
4227 | return 0; | |
4228 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4229 | return 0; | |
4230 | default: | |
4231 | return -EINVAL; | |
4232 | } | |
4233 | } | |
4234 | ||
4235 | static int __init lttng_init_cpu_hotplug(void) | |
4236 | { | |
4237 | int ret; | |
4238 | ||
4239 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4240 | lttng_hotplug_prepare, | |
4241 | lttng_hotplug_dead); | |
4242 | if (ret < 0) { | |
4243 | return ret; | |
4244 | } | |
4245 | lttng_hp_prepare = ret; | |
4246 | lttng_rb_set_hp_prepare(ret); | |
4247 | ||
4248 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4249 | lttng_hotplug_online, | |
4250 | lttng_hotplug_offline); | |
4251 | if (ret < 0) { | |
4252 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4253 | lttng_hp_prepare = 0; | |
4254 | return ret; | |
4255 | } | |
4256 | lttng_hp_online = ret; | |
4257 | lttng_rb_set_hp_online(ret); | |
4258 | ||
4259 | return 0; | |
4260 | } | |
4261 | ||
4262 | static void __exit lttng_exit_cpu_hotplug(void) | |
4263 | { | |
4264 | lttng_rb_set_hp_online(0); | |
4265 | cpuhp_remove_multi_state(lttng_hp_online); | |
4266 | lttng_rb_set_hp_prepare(0); | |
4267 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4268 | } | |
4269 | ||
5f4c791e | 4270 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4271 | static int lttng_init_cpu_hotplug(void) |
4272 | { | |
4273 | return 0; | |
4274 | } | |
4275 | static void lttng_exit_cpu_hotplug(void) | |
4276 | { | |
4277 | } | |
5f4c791e | 4278 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4279 | |
4280 | ||
a90917c3 | 4281 | static int __init lttng_events_init(void) |
4e3c1b9b | 4282 | { |
1c25284c MD |
4283 | int ret; |
4284 | ||
453b2495 JD |
4285 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4286 | if (ret) | |
4287 | return ret; | |
389d7070 | 4288 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4289 | if (ret) |
4290 | return ret; | |
4291 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4292 | if (ret) |
4293 | return ret; | |
4294 | ret = lttng_probes_init(); | |
389d7070 MD |
4295 | if (ret) |
4296 | return ret; | |
07dfc1d0 | 4297 | ret = lttng_context_init(); |
20591cf7 MD |
4298 | if (ret) |
4299 | return ret; | |
07dfc1d0 MD |
4300 | ret = lttng_tracepoint_init(); |
4301 | if (ret) | |
4302 | goto error_tp; | |
a67ba386 MD |
4303 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4304 | if (!event_recorder_cache) { | |
20591cf7 | 4305 | ret = -ENOMEM; |
a67ba386 | 4306 | goto error_kmem_event_recorder; |
dffef45d | 4307 | } |
a67ba386 MD |
4308 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4309 | if (!event_recorder_private_cache) { | |
4310 | ret = -ENOMEM; | |
4311 | goto error_kmem_event_recorder_private; | |
4312 | } | |
4313 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4314 | if (!event_notifier_cache) { |
4315 | ret = -ENOMEM; | |
4316 | goto error_kmem_event_notifier; | |
20591cf7 | 4317 | } |
a67ba386 MD |
4318 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4319 | if (!event_notifier_private_cache) { | |
4320 | ret = -ENOMEM; | |
4321 | goto error_kmem_event_notifier_private; | |
4322 | } | |
80996790 | 4323 | ret = lttng_abi_init(); |
02119ee5 MD |
4324 | if (ret) |
4325 | goto error_abi; | |
0c956676 MD |
4326 | ret = lttng_logger_init(); |
4327 | if (ret) | |
4328 | goto error_logger; | |
1e367326 MD |
4329 | ret = lttng_init_cpu_hotplug(); |
4330 | if (ret) | |
4331 | goto error_hotplug; | |
101215b7 | 4332 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4333 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4334 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4335 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4336 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4337 | LTTNG_VERSION_NAME, |
4338 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4339 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4340 | #else | |
4341 | "", | |
4342 | #endif | |
4343 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4344 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4345 | #else | |
4346 | ""); | |
4347 | #endif | |
4e3c1b9b | 4348 | return 0; |
0c956676 | 4349 | |
1e367326 MD |
4350 | error_hotplug: |
4351 | lttng_logger_exit(); | |
0c956676 MD |
4352 | error_logger: |
4353 | lttng_abi_exit(); | |
02119ee5 | 4354 | error_abi: |
a67ba386 MD |
4355 | kmem_cache_destroy(event_notifier_private_cache); |
4356 | error_kmem_event_notifier_private: | |
dffef45d FD |
4357 | kmem_cache_destroy(event_notifier_cache); |
4358 | error_kmem_event_notifier: | |
a67ba386 MD |
4359 | kmem_cache_destroy(event_recorder_private_cache); |
4360 | error_kmem_event_recorder_private: | |
4361 | kmem_cache_destroy(event_recorder_cache); | |
4362 | error_kmem_event_recorder: | |
20591cf7 | 4363 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4364 | error_tp: |
4365 | lttng_context_exit(); | |
101215b7 | 4366 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4367 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4368 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4369 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4370 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4371 | LTTNG_VERSION_NAME, |
4372 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4373 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4374 | #else | |
4375 | "", | |
4376 | #endif | |
4377 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4378 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4379 | #else | |
4380 | ""); | |
4381 | #endif | |
1c25284c | 4382 | return ret; |
4e3c1b9b MD |
4383 | } |
4384 | ||
a90917c3 | 4385 | module_init(lttng_events_init); |
11b5a3c2 | 4386 | |
a90917c3 | 4387 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4388 | { |
8cdc1a81 | 4389 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4390 | |
1e367326 | 4391 | lttng_exit_cpu_hotplug(); |
0c956676 | 4392 | lttng_logger_exit(); |
80996790 | 4393 | lttng_abi_exit(); |
8cdc1a81 MD |
4394 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4395 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4396 | kmem_cache_destroy(event_recorder_cache); |
4397 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4398 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4399 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4400 | lttng_tracepoint_exit(); |
07dfc1d0 | 4401 | lttng_context_exit(); |
101215b7 | 4402 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4403 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4404 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4405 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4406 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4407 | LTTNG_VERSION_NAME, |
4408 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4409 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4410 | #else | |
4411 | "", | |
4412 | #endif | |
4413 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4414 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4415 | #else | |
4416 | ""); | |
4417 | #endif | |
4e3c1b9b | 4418 | } |
92e94819 | 4419 | |
a90917c3 | 4420 | module_exit(lttng_events_exit); |
11b5a3c2 | 4421 | |
7ca11e77 | 4422 | #include <generated/patches.h> |
101215b7 MJ |
4423 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4424 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4425 | #endif | |
4426 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4427 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4428 | #endif | |
92e94819 MD |
4429 | MODULE_LICENSE("GPL and additional rights"); |
4430 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4431 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4432 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4433 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4434 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4435 | LTTNG_MODULES_EXTRAVERSION); |