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 | |
c190d76e | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b | 61 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
62 | static struct kmem_cache *event_recorder_cache; |
63 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 64 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 65 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 66 | |
8cdc1a81 MD |
67 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
68 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 69 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 70 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 71 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 72 | |
0648898e | 73 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 74 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
a67ba386 MD |
75 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
76 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 77 | static |
8cdc1a81 | 78 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 79 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 80 | struct lttng_kernel_event_recorder *event); |
c099397a | 81 | static |
8cdc1a81 | 82 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
83 | static |
84 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 85 | static |
8cdc1a81 | 86 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
87 | const struct lttng_kernel_type_common *type, |
88 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
89 | size_t nesting); |
90 | static | |
8cdc1a81 | 91 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 92 | const struct lttng_kernel_event_field *field, |
51ef4536 | 93 | size_t nesting, const char **prev_field_name_p); |
c099397a | 94 | |
c099397a | 95 | void synchronize_trace(void) |
abcca994 | 96 | { |
05355f0b MJ |
97 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
98 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
99 | synchronize_rcu(); |
100 | #else | |
abcca994 | 101 | synchronize_sched(); |
92da05ce MJ |
102 | #endif |
103 | ||
5f4c791e | 104 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
105 | #ifdef CONFIG_PREEMPT_RT_FULL |
106 | synchronize_rcu(); | |
107 | #endif | |
5f4c791e | 108 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
109 | #ifdef CONFIG_PREEMPT_RT |
110 | synchronize_rcu(); | |
111 | #endif | |
5f4c791e | 112 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
113 | } |
114 | ||
3c997079 MD |
115 | void lttng_lock_sessions(void) |
116 | { | |
117 | mutex_lock(&sessions_mutex); | |
118 | } | |
119 | ||
120 | void lttng_unlock_sessions(void) | |
121 | { | |
122 | mutex_unlock(&sessions_mutex); | |
123 | } | |
124 | ||
9fe593d2 FD |
125 | static struct lttng_transport *lttng_transport_find(const char *name) |
126 | { | |
127 | struct lttng_transport *transport; | |
128 | ||
129 | list_for_each_entry(transport, <tng_transport_list, node) { | |
130 | if (!strcmp(transport->name, name)) | |
131 | return transport; | |
132 | } | |
133 | return NULL; | |
134 | } | |
135 | ||
3c997079 MD |
136 | /* |
137 | * Called with sessions lock held. | |
138 | */ | |
139 | int lttng_session_active(void) | |
140 | { | |
8cdc1a81 | 141 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
142 | |
143 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 144 | if (iter->pub->active) |
3c997079 MD |
145 | return 1; |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
8cdc1a81 | 150 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 151 | { |
8cdc1a81 MD |
152 | struct lttng_kernel_session *session; |
153 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 154 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 155 | int i; |
4e3c1b9b MD |
156 | |
157 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 158 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 159 | if (!session) |
d83004aa | 160 | goto err; |
8cdc1a81 MD |
161 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
162 | if (!session_priv) | |
163 | goto err_free_session; | |
164 | session->priv = session_priv; | |
165 | session_priv->pub = session; | |
166 | ||
167 | INIT_LIST_HEAD(&session_priv->chan); | |
168 | INIT_LIST_HEAD(&session_priv->events); | |
169 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
170 | |
171 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
172 | GFP_KERNEL); | |
173 | if (!metadata_cache) | |
8cdc1a81 | 174 | goto err_free_session_private; |
0ca42eb7 | 175 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
176 | if (!metadata_cache->data) |
177 | goto err_free_cache; | |
178 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
179 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 180 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 181 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 182 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 183 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 184 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 185 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 186 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
187 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
188 | list_add(&session_priv->list, &sessions); | |
189 | ||
8c0393c3 MD |
190 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
197 | goto tracker_alloc_error; | |
198 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
199 | goto tracker_alloc_error; | |
200 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
201 | goto tracker_alloc_error; | |
202 | ||
4e3c1b9b | 203 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 204 | |
4e3c1b9b | 205 | return session; |
d83004aa | 206 | |
8c0393c3 MD |
207 | tracker_alloc_error: |
208 | lttng_id_tracker_fini(&session->pid_tracker); | |
209 | lttng_id_tracker_fini(&session->vpid_tracker); | |
210 | lttng_id_tracker_fini(&session->uid_tracker); | |
211 | lttng_id_tracker_fini(&session->vuid_tracker); | |
212 | lttng_id_tracker_fini(&session->gid_tracker); | |
213 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
214 | err_free_cache: |
215 | kfree(metadata_cache); | |
8cdc1a81 MD |
216 | err_free_session_private: |
217 | lttng_kvfree(session_priv); | |
d83004aa | 218 | err_free_session: |
48f5e0b5 | 219 | lttng_kvfree(session); |
d83004aa JD |
220 | err: |
221 | mutex_unlock(&sessions_mutex); | |
222 | return NULL; | |
223 | } | |
224 | ||
99f52fcc FD |
225 | static |
226 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
227 | { | |
228 | struct lttng_counter_transport *transport; | |
229 | ||
230 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
231 | if (!strcmp(transport->name, name)) | |
232 | return transport; | |
233 | } | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | struct lttng_counter *lttng_kernel_counter_create( | |
238 | const char *counter_transport_name, | |
239 | size_t number_dimensions, const size_t *dimensions_sizes) | |
240 | { | |
241 | struct lttng_counter *counter = NULL; | |
242 | struct lttng_counter_transport *counter_transport = NULL; | |
243 | ||
244 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
245 | if (!counter_transport) { | |
246 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
247 | counter_transport_name); | |
248 | goto notransport; | |
249 | } | |
250 | if (!try_module_get(counter_transport->owner)) { | |
251 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
252 | goto notransport; | |
253 | } | |
254 | ||
255 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
256 | if (!counter) | |
257 | goto nomem; | |
258 | ||
259 | /* Create event notifier error counter. */ | |
260 | counter->ops = &counter_transport->ops; | |
261 | counter->transport = counter_transport; | |
262 | ||
263 | counter->counter = counter->ops->counter_create( | |
264 | number_dimensions, dimensions_sizes, 0); | |
265 | if (!counter->counter) { | |
266 | goto create_error; | |
267 | } | |
268 | ||
269 | return counter; | |
270 | ||
271 | create_error: | |
272 | lttng_kvfree(counter); | |
273 | nomem: | |
274 | if (counter_transport) | |
275 | module_put(counter_transport->owner); | |
276 | notransport: | |
277 | return NULL; | |
278 | } | |
279 | ||
750b05f2 FD |
280 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
281 | { | |
282 | struct lttng_transport *transport = NULL; | |
283 | struct lttng_event_notifier_group *event_notifier_group; | |
284 | const char *transport_name = "relay-event-notifier"; | |
285 | size_t subbuf_size = 4096; //TODO | |
286 | size_t num_subbuf = 16; //TODO | |
287 | unsigned int switch_timer_interval = 0; | |
288 | unsigned int read_timer_interval = 0; | |
dffef45d | 289 | int i; |
750b05f2 FD |
290 | |
291 | mutex_lock(&sessions_mutex); | |
292 | ||
293 | transport = lttng_transport_find(transport_name); | |
294 | if (!transport) { | |
295 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
296 | transport_name); | |
297 | goto notransport; | |
298 | } | |
299 | if (!try_module_get(transport->owner)) { | |
300 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
301 | transport_name); | |
302 | goto notransport; | |
303 | } | |
304 | ||
305 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
306 | GFP_KERNEL); | |
307 | if (!event_notifier_group) | |
308 | goto nomem; | |
309 | ||
310 | /* | |
311 | * Initialize the ring buffer used to store event notifier | |
312 | * notifications. | |
313 | */ | |
314 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 315 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
316 | transport_name, event_notifier_group, NULL, |
317 | subbuf_size, num_subbuf, switch_timer_interval, | |
318 | read_timer_interval); | |
319 | if (!event_notifier_group->chan) | |
320 | goto create_error; | |
321 | ||
322 | event_notifier_group->transport = transport; | |
dffef45d FD |
323 | |
324 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
325 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
326 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
327 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
328 | ||
750b05f2 FD |
329 | list_add(&event_notifier_group->node, &event_notifier_groups); |
330 | ||
331 | mutex_unlock(&sessions_mutex); | |
332 | ||
333 | return event_notifier_group; | |
334 | ||
335 | create_error: | |
336 | lttng_kvfree(event_notifier_group); | |
337 | nomem: | |
338 | if (transport) | |
339 | module_put(transport->owner); | |
340 | notransport: | |
341 | mutex_unlock(&sessions_mutex); | |
342 | return NULL; | |
343 | } | |
344 | ||
d83004aa JD |
345 | void metadata_cache_destroy(struct kref *kref) |
346 | { | |
347 | struct lttng_metadata_cache *cache = | |
348 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 349 | vfree(cache->data); |
d83004aa | 350 | kfree(cache); |
4e3c1b9b MD |
351 | } |
352 | ||
8cdc1a81 | 353 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 354 | { |
f7d06400 | 355 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 356 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 357 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 358 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 359 | int ret; |
4e3c1b9b MD |
360 | |
361 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 362 | WRITE_ONCE(session->active, 0); |
f7d06400 MD |
363 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
364 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
365 | WARN_ON(ret); |
366 | } | |
8cdc1a81 | 367 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 368 | ret = _lttng_event_unregister(event_recorder_priv->pub); |
dda6a249 MD |
369 | WARN_ON(ret); |
370 | } | |
abcca994 | 371 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 MD |
372 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
373 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
374 | WARN_ON(ret); |
375 | } | |
b2bc0bc8 | 376 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
8cdc1a81 | 377 | &session->priv->enablers_head, node) |
b2bc0bc8 | 378 | lttng_event_enabler_destroy(event_enabler); |
8cdc1a81 | 379 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 380 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
381 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
382 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
383 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 384 | } |
8cdc1a81 MD |
385 | mutex_lock(&session->priv->metadata_cache->lock); |
386 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 387 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 388 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
389 | lttng_id_tracker_fini(&session->pid_tracker); |
390 | lttng_id_tracker_fini(&session->vpid_tracker); | |
391 | lttng_id_tracker_fini(&session->uid_tracker); | |
392 | lttng_id_tracker_fini(&session->vuid_tracker); | |
393 | lttng_id_tracker_fini(&session->gid_tracker); | |
394 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
395 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
396 | list_del(&session->priv->list); | |
4e3c1b9b | 397 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 398 | lttng_kvfree(session->priv); |
48f5e0b5 | 399 | lttng_kvfree(session); |
4e3c1b9b MD |
400 | } |
401 | ||
dffef45d FD |
402 | void lttng_event_notifier_group_destroy( |
403 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 404 | { |
dffef45d | 405 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 406 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
407 | int ret; |
408 | ||
750b05f2 FD |
409 | if (!event_notifier_group) |
410 | return; | |
411 | ||
412 | mutex_lock(&sessions_mutex); | |
dffef45d | 413 | |
3b82c4e1 | 414 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
415 | WARN_ON(ret); |
416 | ||
a67ba386 MD |
417 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
418 | &event_notifier_group->event_notifiers_head, node) { | |
419 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
420 | WARN_ON(ret); |
421 | } | |
422 | ||
b01155ba FD |
423 | /* Wait for in-flight event notifier to complete */ |
424 | synchronize_trace(); | |
425 | ||
21f58fb7 FD |
426 | irq_work_sync(&event_notifier_group->wakeup_pending); |
427 | ||
8a8ac9a8 FD |
428 | kfree(event_notifier_group->sc_filter); |
429 | ||
dffef45d FD |
430 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
431 | &event_notifier_group->enablers_head, node) | |
432 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
433 | ||
a67ba386 MD |
434 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
435 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 436 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 437 | |
99f52fcc FD |
438 | if (event_notifier_group->error_counter) { |
439 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 440 | |
99f52fcc FD |
441 | error_counter->ops->counter_destroy(error_counter->counter); |
442 | module_put(error_counter->transport->owner); | |
443 | lttng_kvfree(error_counter); | |
444 | event_notifier_group->error_counter = NULL; | |
445 | } | |
446 | ||
4a399b76 | 447 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
448 | module_put(event_notifier_group->transport->owner); |
449 | list_del(&event_notifier_group->node); | |
dffef45d | 450 | |
750b05f2 FD |
451 | mutex_unlock(&sessions_mutex); |
452 | lttng_kvfree(event_notifier_group); | |
453 | } | |
454 | ||
8cdc1a81 | 455 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
456 | { |
457 | int ret; | |
458 | ||
459 | mutex_lock(&sessions_mutex); | |
460 | ret = lttng_statedump_start(session); | |
461 | mutex_unlock(&sessions_mutex); | |
462 | return ret; | |
463 | } | |
464 | ||
8cdc1a81 | 465 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
466 | { |
467 | int ret = 0; | |
f7d06400 | 468 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
469 | |
470 | mutex_lock(&sessions_mutex); | |
471 | if (session->active) { | |
472 | ret = -EBUSY; | |
473 | goto end; | |
474 | } | |
c099397a | 475 | |
3c997079 | 476 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 477 | session->priv->tstate = 1; |
3c997079 | 478 | |
4ef81e4a | 479 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 480 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 481 | |
c099397a MD |
482 | /* |
483 | * Snapshot the number of events per channel to know the type of header | |
484 | * we need to use. | |
485 | */ | |
f7d06400 MD |
486 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
487 | if (chan_priv->header_type) | |
488 | continue; /* don't change it if session stop/restart */ | |
489 | if (chan_priv->free_event_id < 31) | |
490 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 491 | else |
f7d06400 | 492 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
493 | } |
494 | ||
64af2437 | 495 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
496 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
497 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
498 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 499 | } |
64af2437 | 500 | |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 502 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 503 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 504 | if (ret) { |
a8f2d0c7 | 505 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
506 | goto end; |
507 | } | |
508 | ret = lttng_statedump_start(session); | |
360f38ea | 509 | if (ret) |
a8f2d0c7 | 510 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
511 | end: |
512 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 513 | return ret; |
c0e31d2e MD |
514 | } |
515 | ||
8cdc1a81 | 516 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
517 | { |
518 | int ret = 0; | |
f7d06400 | 519 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
520 | |
521 | mutex_lock(&sessions_mutex); | |
522 | if (!session->active) { | |
523 | ret = -EBUSY; | |
524 | goto end; | |
525 | } | |
a8f2d0c7 | 526 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
527 | |
528 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 529 | session->priv->tstate = 0; |
b2bc0bc8 | 530 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
531 | |
532 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
533 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
534 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
535 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 536 | } |
c0e31d2e MD |
537 | end: |
538 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 539 | return ret; |
c0e31d2e MD |
540 | } |
541 | ||
8cdc1a81 | 542 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
543 | { |
544 | int ret = 0; | |
f7d06400 | 545 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 546 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 547 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
548 | struct lttng_metadata_stream *stream; |
549 | ||
550 | mutex_lock(&sessions_mutex); | |
551 | if (!session->active) { | |
552 | ret = -EBUSY; | |
553 | goto end; | |
554 | } | |
555 | ||
556 | mutex_lock(&cache->lock); | |
557 | memset(cache->data, 0, cache->cache_alloc); | |
558 | cache->metadata_written = 0; | |
559 | cache->version++; | |
8cdc1a81 | 560 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
561 | stream->metadata_out = 0; |
562 | stream->metadata_in = 0; | |
563 | } | |
564 | mutex_unlock(&cache->lock); | |
565 | ||
8cdc1a81 | 566 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
567 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
568 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
569 | } |
570 | ||
8cdc1a81 | 571 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 572 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
573 | } |
574 | ||
575 | ret = _lttng_session_metadata_statedump(session); | |
576 | ||
577 | end: | |
578 | mutex_unlock(&sessions_mutex); | |
579 | return ret; | |
580 | } | |
581 | ||
f7d06400 | 582 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 583 | { |
3c997079 | 584 | int ret = 0; |
e64957da | 585 | |
3c997079 | 586 | mutex_lock(&sessions_mutex); |
f7d06400 | 587 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
588 | ret = -EPERM; |
589 | goto end; | |
590 | } | |
f7d06400 | 591 | if (channel->parent.enabled) { |
3c997079 MD |
592 | ret = -EEXIST; |
593 | goto end; | |
594 | } | |
595 | /* Set transient enabler state to "enabled" */ | |
f7d06400 MD |
596 | channel->priv->parent.tstate = 1; |
597 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 598 | /* Set atomically the state to "enabled" */ |
f7d06400 | 599 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
600 | end: |
601 | mutex_unlock(&sessions_mutex); | |
602 | return ret; | |
e64957da MD |
603 | } |
604 | ||
f7d06400 | 605 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 606 | { |
3c997079 | 607 | int ret = 0; |
e64957da | 608 | |
3c997079 | 609 | mutex_lock(&sessions_mutex); |
f7d06400 | 610 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
611 | ret = -EPERM; |
612 | goto end; | |
613 | } | |
f7d06400 | 614 | if (!channel->parent.enabled) { |
3c997079 MD |
615 | ret = -EEXIST; |
616 | goto end; | |
617 | } | |
618 | /* Set atomically the state to "disabled" */ | |
f7d06400 | 619 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 620 | /* Set transient enabler state to "enabled" */ |
f7d06400 MD |
621 | channel->priv->parent.tstate = 0; |
622 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
623 | end: |
624 | mutex_unlock(&sessions_mutex); | |
625 | return ret; | |
e64957da MD |
626 | } |
627 | ||
9d993668 | 628 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 629 | { |
3c997079 | 630 | int ret = 0; |
e64957da | 631 | |
3c997079 | 632 | mutex_lock(&sessions_mutex); |
9d993668 MD |
633 | switch (event->type) { |
634 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
635 | { | |
636 | struct lttng_kernel_event_recorder *event_recorder = | |
637 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
638 | ||
f7d06400 | 639 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
640 | ret = -EPERM; |
641 | goto end; | |
642 | } | |
a0493bef | 643 | break; |
9d993668 MD |
644 | } |
645 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
646 | switch (event->priv->instrumentation) { | |
647 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
648 | ret = -EINVAL; | |
649 | goto end; | |
650 | default: | |
651 | break; | |
652 | } | |
a0493bef MD |
653 | break; |
654 | default: | |
9d993668 | 655 | break; |
a0493bef | 656 | } |
e64957da | 657 | |
9d993668 | 658 | if (event->enabled) { |
3c997079 MD |
659 | ret = -EEXIST; |
660 | goto end; | |
661 | } | |
a67ba386 | 662 | switch (event->priv->instrumentation) { |
c190d76e MJ |
663 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
664 | lttng_fallthrough; | |
606828e4 | 665 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
666 | ret = -EINVAL; |
667 | break; | |
b4a75708 | 668 | |
c190d76e MJ |
669 | case LTTNG_KERNEL_ABI_KPROBE: |
670 | lttng_fallthrough; | |
606828e4 | 671 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 672 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 673 | break; |
b4a75708 | 674 | |
606828e4 | 675 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 676 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 677 | break; |
b4a75708 | 678 | |
c190d76e MJ |
679 | case LTTNG_KERNEL_ABI_FUNCTION: |
680 | lttng_fallthrough; | |
681 | case LTTNG_KERNEL_ABI_NOOP: | |
682 | lttng_fallthrough; | |
a0493bef MD |
683 | default: |
684 | WARN_ON_ONCE(1); | |
685 | ret = -EINVAL; | |
686 | } | |
3c997079 MD |
687 | end: |
688 | mutex_unlock(&sessions_mutex); | |
689 | return ret; | |
e64957da MD |
690 | } |
691 | ||
9d993668 | 692 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
693 | { |
694 | int ret = 0; | |
695 | ||
696 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
697 | switch (event->type) { |
698 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
699 | { | |
700 | struct lttng_kernel_event_recorder *event_recorder = | |
701 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
702 | ||
f7d06400 | 703 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
704 | ret = -EPERM; |
705 | goto end; | |
706 | } | |
b01155ba | 707 | break; |
9d993668 MD |
708 | } |
709 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
710 | switch (event->priv->instrumentation) { | |
711 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
712 | ret = -EINVAL; | |
713 | goto end; | |
714 | default: | |
715 | break; | |
716 | } | |
2b16f0c9 | 717 | break; |
dffef45d | 718 | default: |
9d993668 | 719 | break; |
dffef45d | 720 | } |
dffef45d | 721 | |
a67ba386 | 722 | if (!event->enabled) { |
dffef45d FD |
723 | ret = -EEXIST; |
724 | goto end; | |
725 | } | |
a67ba386 | 726 | switch (event->priv->instrumentation) { |
c190d76e MJ |
727 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
728 | lttng_fallthrough; | |
606828e4 | 729 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
730 | ret = -EINVAL; |
731 | break; | |
b4a75708 | 732 | |
c190d76e MJ |
733 | case LTTNG_KERNEL_ABI_KPROBE: |
734 | lttng_fallthrough; | |
606828e4 | 735 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 736 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 737 | break; |
b4a75708 | 738 | |
9d993668 MD |
739 | case LTTNG_KERNEL_ABI_KRETPROBE: |
740 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
741 | break; | |
742 | ||
c190d76e MJ |
743 | case LTTNG_KERNEL_ABI_FUNCTION: |
744 | lttng_fallthrough; | |
745 | case LTTNG_KERNEL_ABI_NOOP: | |
746 | lttng_fallthrough; | |
dffef45d FD |
747 | default: |
748 | WARN_ON_ONCE(1); | |
749 | ret = -EINVAL; | |
750 | } | |
751 | end: | |
752 | mutex_unlock(&sessions_mutex); | |
753 | return ret; | |
754 | } | |
755 | ||
f7d06400 | 756 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
757 | const char *transport_name, |
758 | void *buf_addr, | |
4e3c1b9b MD |
759 | size_t subbuf_size, size_t num_subbuf, |
760 | unsigned int switch_timer_interval, | |
d83004aa JD |
761 | unsigned int read_timer_interval, |
762 | enum channel_type channel_type) | |
4e3c1b9b | 763 | { |
f7d06400 MD |
764 | struct lttng_kernel_channel_buffer *chan; |
765 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 766 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
767 | |
768 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 769 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 770 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 771 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 772 | if (!transport) { |
5a15f70c | 773 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 774 | transport_name); |
c0e31d2e | 775 | goto notransport; |
f3d01b96 | 776 | } |
a33c9927 | 777 | if (!try_module_get(transport->owner)) { |
5a15f70c | 778 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
779 | goto notransport; |
780 | } | |
f7d06400 | 781 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 782 | if (!chan) |
c0e31d2e | 783 | goto nomem; |
f7d06400 MD |
784 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
785 | if (!chan_priv) | |
786 | goto nomem_priv; | |
787 | chan->priv = chan_priv; | |
788 | chan_priv->pub = chan; | |
789 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
790 | chan->parent.session = session; | |
791 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 792 | chan->ops = &transport->ops; |
125b4df4 MD |
793 | /* |
794 | * Note: the channel creation op already writes into the packet | |
795 | * headers. Therefore the "chan" information used as input | |
796 | * should be already accessible. | |
797 | */ | |
f7d06400 | 798 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
799 | chan, buf_addr, subbuf_size, num_subbuf, |
800 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 801 | if (!chan->priv->rb_chan) |
f3d01b96 | 802 | goto create_error; |
f7d06400 MD |
803 | chan->priv->parent.tstate = 1; |
804 | chan->parent.enabled = 1; | |
805 | chan->priv->transport = transport; | |
806 | chan->priv->channel_type = channel_type; | |
807 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
808 | mutex_unlock(&sessions_mutex); |
809 | return chan; | |
810 | ||
f3d01b96 | 811 | create_error: |
f7d06400 MD |
812 | kfree(chan_priv); |
813 | nomem_priv: | |
f3d01b96 | 814 | kfree(chan); |
c0e31d2e | 815 | nomem: |
a33c9927 MD |
816 | if (transport) |
817 | module_put(transport->owner); | |
c0e31d2e | 818 | notransport: |
e5382b6d | 819 | active: |
4e3c1b9b MD |
820 | mutex_unlock(&sessions_mutex); |
821 | return NULL; | |
822 | } | |
823 | ||
824 | /* | |
d83004aa JD |
825 | * Only used internally at session destruction for per-cpu channels, and |
826 | * when metadata channel is released. | |
827 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 828 | */ |
aa7c23a9 | 829 | static |
f7d06400 | 830 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 831 | { |
f7d06400 MD |
832 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
833 | module_put(chan->priv->transport->owner); | |
834 | list_del(&chan->priv->node); | |
835 | lttng_kernel_destroy_context(chan->priv->ctx); | |
836 | kfree(chan->priv); | |
4e3c1b9b MD |
837 | kfree(chan); |
838 | } | |
839 | ||
f7d06400 | 840 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 841 | { |
f7d06400 | 842 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
843 | |
844 | /* Protect the metadata cache with the sessions_mutex. */ | |
845 | mutex_lock(&sessions_mutex); | |
846 | _lttng_channel_destroy(chan); | |
847 | mutex_unlock(&sessions_mutex); | |
848 | } | |
849 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
850 | ||
851 | static | |
852 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
853 | { | |
854 | stream->finalized = 1; | |
855 | wake_up_interruptible(&stream->read_wait); | |
856 | } | |
857 | ||
a101fa10 | 858 | |
e5382b6d MD |
859 | /* |
860 | * Supports event creation while tracing session is active. | |
3c997079 | 861 | * Needs to be called with sessions mutex held. |
e5382b6d | 862 | */ |
f7d06400 | 863 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 864 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 865 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 866 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 867 | { |
f7d06400 | 868 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
869 | struct lttng_kernel_event_recorder *event_recorder; |
870 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
871 | const char *event_name; |
872 | struct hlist_head *head; | |
3d084699 | 873 | int ret; |
4e3c1b9b | 874 | |
f7d06400 | 875 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 876 | ret = -EMFILE; |
e5382b6d | 877 | goto full; |
abc0446a | 878 | } |
3c997079 MD |
879 | |
880 | switch (itype) { | |
606828e4 | 881 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 882 | event_name = event_desc->event_name; |
3c997079 | 883 | break; |
b4a75708 | 884 | |
c190d76e MJ |
885 | case LTTNG_KERNEL_ABI_KPROBE: |
886 | lttng_fallthrough; | |
887 | case LTTNG_KERNEL_ABI_UPROBE: | |
888 | lttng_fallthrough; | |
889 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
890 | lttng_fallthrough; | |
606828e4 | 891 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
892 | event_name = event_param->name; |
893 | break; | |
b4a75708 | 894 | |
c190d76e MJ |
895 | case LTTNG_KERNEL_ABI_FUNCTION: |
896 | lttng_fallthrough; | |
897 | case LTTNG_KERNEL_ABI_NOOP: | |
898 | lttng_fallthrough; | |
3c997079 MD |
899 | default: |
900 | WARN_ON_ONCE(1); | |
901 | ret = -EINVAL; | |
902 | goto type_error; | |
903 | } | |
4a11ef1c | 904 | |
8cdc1a81 | 905 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 906 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
907 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
908 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
909 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 910 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 911 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
912 | ret = -EEXIST; |
913 | goto exist; | |
abc0446a MD |
914 | } |
915 | } | |
3c997079 | 916 | |
a67ba386 MD |
917 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
918 | if (!event_recorder) { | |
4cf0bf51 | 919 | ret = -ENOMEM; |
4e3c1b9b | 920 | goto cache_error; |
abc0446a | 921 | } |
a67ba386 MD |
922 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
923 | if (!event_recorder_priv) { | |
924 | ret = -ENOMEM; | |
925 | goto cache_private_error; | |
926 | } | |
927 | event_recorder_priv->pub = event_recorder; | |
928 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
929 | event_recorder->priv = event_recorder_priv; | |
930 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
931 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
932 | ||
8a445457 | 933 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 934 | event_recorder->chan = chan; |
f7d06400 | 935 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
936 | event_recorder->priv->parent.instrumentation = itype; |
937 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
938 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
939 | |
940 | switch (itype) { | |
606828e4 | 941 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 942 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
943 | event_recorder->parent.enabled = 0; |
944 | event_recorder->priv->parent.registered = 0; | |
945 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
946 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 947 | ret = -ENOENT; |
d3dbe23c | 948 | goto register_error; |
abc0446a | 949 | } |
3c997079 MD |
950 | /* Populate lttng_event structure before event registration. */ |
951 | smp_wmb(); | |
baf20995 | 952 | break; |
b4a75708 | 953 | |
606828e4 | 954 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
955 | /* |
956 | * Needs to be explicitly enabled after creation, since | |
957 | * we may want to apply filters. | |
958 | */ | |
a67ba386 MD |
959 | event_recorder->parent.enabled = 0; |
960 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
961 | /* |
962 | * Populate lttng_event structure before event | |
963 | * registration. | |
964 | */ | |
965 | smp_wmb(); | |
8bf17deb | 966 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
967 | event_param->u.kprobe.symbol_name, |
968 | event_param->u.kprobe.offset, | |
969 | event_param->u.kprobe.addr, | |
a67ba386 | 970 | event_recorder); |
abc0446a | 971 | if (ret) { |
4cf0bf51 | 972 | ret = -EINVAL; |
d6d808f3 | 973 | goto register_error; |
abc0446a | 974 | } |
a67ba386 | 975 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 976 | WARN_ON_ONCE(!ret); |
d6d808f3 | 977 | break; |
b4a75708 | 978 | |
606828e4 | 979 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 980 | { |
a67ba386 MD |
981 | struct lttng_kernel_event_recorder *event_recorder_return; |
982 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
983 | |
984 | /* kretprobe defines 2 events */ | |
a0493bef MD |
985 | /* |
986 | * Needs to be explicitly enabled after creation, since | |
987 | * we may want to apply filters. | |
988 | */ | |
a67ba386 MD |
989 | event_recorder->parent.enabled = 0; |
990 | event_recorder->priv->parent.registered = 1; | |
991 | ||
992 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
993 | if (!event_recorder_return) { | |
994 | ret = -ENOMEM; | |
995 | goto register_error; | |
996 | } | |
997 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
998 | if (!event_recorder_return_priv) { | |
999 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1000 | ret = -ENOMEM; |
7371f44c | 1001 | goto register_error; |
abc0446a | 1002 | } |
a67ba386 MD |
1003 | event_recorder_return_priv->pub = event_recorder_return; |
1004 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1005 | event_recorder_return->priv = event_recorder_return_priv; | |
1006 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1007 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1008 | ||
8a445457 | 1009 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1010 | event_recorder_return->chan = chan; |
f7d06400 | 1011 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1012 | event_recorder_return->priv->parent.instrumentation = itype; |
1013 | event_recorder_return->parent.enabled = 0; | |
1014 | event_recorder_return->priv->parent.registered = 1; | |
1015 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1016 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1017 | /* |
a90917c3 | 1018 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1019 | */ |
1020 | smp_wmb(); | |
3c997079 | 1021 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1022 | event_param->u.kretprobe.symbol_name, |
1023 | event_param->u.kretprobe.offset, | |
1024 | event_param->u.kretprobe.addr, | |
a67ba386 | 1025 | event_recorder, event_recorder_return); |
7371f44c | 1026 | if (ret) { |
a67ba386 MD |
1027 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1028 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1029 | ret = -EINVAL; |
7371f44c MD |
1030 | goto register_error; |
1031 | } | |
1032 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1033 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1034 | WARN_ON_ONCE(!ret); |
a67ba386 | 1035 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1036 | WARN_ON_ONCE(!ret); |
f7d06400 | 1037 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1038 | event_recorder_return); |
abc0446a | 1039 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1040 | if (ret) { |
a67ba386 MD |
1041 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1042 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1043 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1044 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1045 | goto statedump_error; |
1046 | } | |
f7d06400 | 1047 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1048 | break; |
1049 | } | |
b4a75708 | 1050 | |
606828e4 | 1051 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1052 | /* |
1053 | * Needs to be explicitly enabled after creation, since | |
1054 | * we may want to apply filters. | |
1055 | */ | |
a67ba386 MD |
1056 | event_recorder->parent.enabled = 0; |
1057 | event_recorder->priv->parent.registered = 0; | |
1058 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1059 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1060 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1061 | ret = -EINVAL; |
1062 | goto register_error; | |
606828e4 | 1063 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1064 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1065 | break; |
606828e4 | 1066 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1067 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1068 | break; |
1069 | } | |
1070 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1071 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1072 | ret = -EINVAL; |
1073 | goto register_error; | |
606828e4 | 1074 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1075 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1076 | break; |
606828e4 | 1077 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1078 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1079 | break; |
1080 | } | |
a67ba386 | 1081 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1082 | ret = -EINVAL; |
259b6cb3 | 1083 | goto register_error; |
abc0446a | 1084 | } |
1ec65de1 | 1085 | break; |
b4a75708 | 1086 | |
606828e4 | 1087 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1088 | /* |
1089 | * Needs to be explicitly enabled after creation, since | |
1090 | * we may want to apply filters. | |
1091 | */ | |
a67ba386 MD |
1092 | event_recorder->parent.enabled = 0; |
1093 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1094 | |
a344f64b FD |
1095 | /* |
1096 | * Populate lttng_event structure before event | |
1097 | * registration. | |
1098 | */ | |
1099 | smp_wmb(); | |
149b9a9d | 1100 | |
83b802dc | 1101 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1102 | event_param->u.uprobe.fd, |
a67ba386 | 1103 | event_recorder); |
149b9a9d YB |
1104 | if (ret) |
1105 | goto register_error; | |
a67ba386 | 1106 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1107 | WARN_ON_ONCE(!ret); |
1108 | break; | |
b4a75708 | 1109 | |
c190d76e MJ |
1110 | case LTTNG_KERNEL_ABI_FUNCTION: |
1111 | lttng_fallthrough; | |
1112 | case LTTNG_KERNEL_ABI_NOOP: | |
1113 | lttng_fallthrough; | |
baf20995 MD |
1114 | default: |
1115 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1116 | ret = -EINVAL; |
df07930b | 1117 | goto register_error; |
baf20995 | 1118 | } |
f7d06400 | 1119 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1120 | WARN_ON_ONCE(ret > 0); |
1121 | if (ret) { | |
c099397a | 1122 | goto statedump_error; |
abc0446a | 1123 | } |
a67ba386 | 1124 | hlist_add_head(&event_recorder->priv->hlist, head); |
f7d06400 | 1125 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1126 | return event_recorder; |
4e3c1b9b | 1127 | |
c099397a | 1128 | statedump_error: |
259b6cb3 | 1129 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1130 | register_error: |
a67ba386 MD |
1131 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1132 | cache_private_error: | |
1133 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1134 | cache_error: |
1135 | exist: | |
3c997079 | 1136 | type_error: |
e5382b6d | 1137 | full: |
4cf0bf51 | 1138 | return ERR_PTR(ret); |
4e3c1b9b MD |
1139 | } |
1140 | ||
a67ba386 | 1141 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1142 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1143 | uint64_t token, uint64_t error_counter_index, |
1144 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1145 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1146 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1147 | { |
a67ba386 MD |
1148 | struct lttng_kernel_event_notifier *event_notifier; |
1149 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1150 | struct lttng_counter *error_counter; |
dffef45d FD |
1151 | const char *event_name; |
1152 | struct hlist_head *head; | |
1153 | int ret; | |
1154 | ||
1155 | switch (itype) { | |
606828e4 | 1156 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1157 | event_name = event_desc->event_name; |
b01155ba | 1158 | break; |
b4a75708 | 1159 | |
c190d76e MJ |
1160 | case LTTNG_KERNEL_ABI_KPROBE: |
1161 | lttng_fallthrough; | |
1162 | case LTTNG_KERNEL_ABI_UPROBE: | |
1163 | lttng_fallthrough; | |
606828e4 | 1164 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1165 | event_name = event_notifier_param->event.name; |
1166 | break; | |
b4a75708 | 1167 | |
c190d76e MJ |
1168 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1169 | lttng_fallthrough; | |
1170 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1171 | lttng_fallthrough; | |
1172 | case LTTNG_KERNEL_ABI_NOOP: | |
1173 | lttng_fallthrough; | |
dffef45d FD |
1174 | default: |
1175 | WARN_ON_ONCE(1); | |
1176 | ret = -EINVAL; | |
1177 | goto type_error; | |
1178 | } | |
1179 | ||
1180 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1181 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1182 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1183 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1184 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1185 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1186 | && event_notifier_group == event_notifier_priv->group |
1187 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1188 | ret = -EEXIST; |
1189 | goto exist; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1194 | if (!event_notifier) { | |
1195 | ret = -ENOMEM; | |
1196 | goto cache_error; | |
1197 | } | |
a67ba386 MD |
1198 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1199 | if (!event_notifier_priv) { | |
1200 | ret = -ENOMEM; | |
1201 | goto cache_private_error; | |
1202 | } | |
1203 | event_notifier_priv->pub = event_notifier; | |
1204 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1205 | event_notifier->priv = event_notifier_priv; | |
1206 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1207 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1208 | ||
1209 | event_notifier->priv->group = event_notifier_group; | |
1210 | event_notifier->priv->parent.user_token = token; | |
1211 | event_notifier->priv->error_counter_index = error_counter_index; | |
1212 | event_notifier->priv->num_captures = 0; | |
1213 | event_notifier->priv->parent.instrumentation = itype; | |
1214 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1215 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1216 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1217 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1218 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1219 | |
1220 | switch (itype) { | |
606828e4 | 1221 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1222 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1223 | event_notifier->parent.enabled = 0; |
1224 | event_notifier->priv->parent.registered = 0; | |
1225 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1226 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1227 | ret = -ENOENT; |
1228 | goto register_error; | |
1229 | } | |
1230 | /* Populate lttng_event_notifier structure before event registration. */ | |
1231 | smp_wmb(); | |
1232 | break; | |
b4a75708 | 1233 | |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1235 | /* |
1236 | * Needs to be explicitly enabled after creation, since | |
1237 | * we may want to apply filters. | |
1238 | */ | |
a67ba386 MD |
1239 | event_notifier->parent.enabled = 0; |
1240 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1241 | /* |
1242 | * Populate lttng_event_notifier structure before event | |
1243 | * registration. | |
1244 | */ | |
1245 | smp_wmb(); | |
1246 | ret = lttng_kprobes_register_event_notifier( | |
1247 | event_notifier_param->event.u.kprobe.symbol_name, | |
1248 | event_notifier_param->event.u.kprobe.offset, | |
1249 | event_notifier_param->event.u.kprobe.addr, | |
1250 | event_notifier); | |
1251 | if (ret) { | |
1252 | ret = -EINVAL; | |
1253 | goto register_error; | |
1254 | } | |
a67ba386 | 1255 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1256 | WARN_ON_ONCE(!ret); |
1257 | break; | |
b4a75708 | 1258 | |
606828e4 | 1259 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1260 | /* |
1261 | * Needs to be explicitly enabled after creation, since | |
1262 | * we may want to apply filters. | |
1263 | */ | |
a67ba386 MD |
1264 | event_notifier->parent.enabled = 0; |
1265 | event_notifier->priv->parent.registered = 0; | |
1266 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1267 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1268 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1269 | ret = -EINVAL; |
1270 | goto register_error; | |
606828e4 | 1271 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1272 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1273 | break; |
606828e4 | 1274 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1275 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1276 | break; |
1277 | } | |
1278 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1279 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1280 | ret = -EINVAL; |
1281 | goto register_error; | |
606828e4 | 1282 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1283 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1284 | break; |
606828e4 | 1285 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1286 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1287 | break; |
1288 | } | |
1289 | ||
a67ba386 | 1290 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1291 | ret = -EINVAL; |
1292 | goto register_error; | |
1293 | } | |
1294 | break; | |
b4a75708 | 1295 | |
606828e4 | 1296 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1297 | /* |
1298 | * Needs to be explicitly enabled after creation, since | |
1299 | * we may want to apply filters. | |
1300 | */ | |
a67ba386 MD |
1301 | event_notifier->parent.enabled = 0; |
1302 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1303 | |
1304 | /* | |
1305 | * Populate lttng_event_notifier structure before | |
1306 | * event_notifier registration. | |
1307 | */ | |
1308 | smp_wmb(); | |
1309 | ||
1310 | ret = lttng_uprobes_register_event_notifier( | |
1311 | event_notifier_param->event.name, | |
1312 | event_notifier_param->event.u.uprobe.fd, | |
1313 | event_notifier); | |
1314 | if (ret) | |
1315 | goto register_error; | |
a67ba386 | 1316 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1317 | WARN_ON_ONCE(!ret); |
1318 | break; | |
b4a75708 | 1319 | |
c190d76e MJ |
1320 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1321 | lttng_fallthrough; | |
1322 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1323 | lttng_fallthrough; | |
1324 | case LTTNG_KERNEL_ABI_NOOP: | |
1325 | lttng_fallthrough; | |
dffef45d FD |
1326 | default: |
1327 | WARN_ON_ONCE(1); | |
1328 | ret = -EINVAL; | |
1329 | goto register_error; | |
1330 | } | |
1331 | ||
a67ba386 MD |
1332 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1333 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1334 | |
1335 | /* | |
1336 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1337 | * bucket is currently in use. We trust it. The session lock |
1338 | * synchronizes against concurrent creation of the error | |
1339 | * counter. | |
99f52fcc | 1340 | */ |
ab04d7b1 MD |
1341 | error_counter = event_notifier_group->error_counter; |
1342 | if (error_counter) { | |
99f52fcc FD |
1343 | size_t dimension_index[1]; |
1344 | ||
1345 | /* | |
1346 | * Check that the index is within the boundary of the counter. | |
1347 | */ | |
a67ba386 | 1348 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1349 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1350 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1351 | ret = -EINVAL; |
1352 | goto register_error; | |
1353 | } | |
1354 | ||
a67ba386 | 1355 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1356 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1357 | if (ret) { |
1358 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1359 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1360 | goto register_error; |
1361 | } | |
1362 | } | |
1363 | ||
dffef45d FD |
1364 | return event_notifier; |
1365 | ||
1366 | register_error: | |
a67ba386 MD |
1367 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1368 | cache_private_error: | |
dffef45d FD |
1369 | kmem_cache_free(event_notifier_cache, event_notifier); |
1370 | cache_error: | |
1371 | exist: | |
1372 | type_error: | |
1373 | return ERR_PTR(ret); | |
1374 | } | |
1375 | ||
99f52fcc FD |
1376 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1377 | const size_t *dim_indexes, int32_t cpu, | |
1378 | int64_t *val, bool *overflow, bool *underflow) | |
1379 | { | |
1380 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1381 | cpu, val, overflow, underflow); | |
1382 | } | |
1383 | ||
1384 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1385 | const size_t *dim_indexes, int64_t *val, | |
1386 | bool *overflow, bool *underflow) | |
1387 | { | |
1388 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1389 | val, overflow, underflow); | |
1390 | } | |
1391 | ||
1392 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1393 | const size_t *dim_indexes) | |
1394 | { | |
1395 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1396 | } | |
1397 | ||
f7d06400 | 1398 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 1399 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1400 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1401 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1402 | { |
a67ba386 | 1403 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1404 | |
1405 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1406 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1407 | mutex_unlock(&sessions_mutex); |
1408 | return event; | |
1409 | } | |
1410 | ||
a67ba386 | 1411 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1412 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1413 | uint64_t id, uint64_t error_counter_index, |
1414 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1415 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1416 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1417 | { |
a67ba386 | 1418 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1419 | |
1420 | mutex_lock(&sessions_mutex); | |
1421 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1422 | error_counter_index, event_notifier_group, |
a67ba386 | 1423 | event_notifier_param, itype); |
dffef45d FD |
1424 | mutex_unlock(&sessions_mutex); |
1425 | return event_notifier; | |
1426 | } | |
1427 | ||
3c997079 MD |
1428 | /* Only used for tracepoints for now. */ |
1429 | static | |
a67ba386 | 1430 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1431 | { |
437d5aa5 | 1432 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1433 | int ret = -EINVAL; |
3c997079 | 1434 | |
a67ba386 | 1435 | if (event_recorder->priv->parent.registered) |
3c997079 | 1436 | return; |
4ecb5ad5 | 1437 | |
a67ba386 MD |
1438 | desc = event_recorder->priv->parent.desc; |
1439 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1440 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1441 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1442 | desc->tp_class->probe_callback, |
a67ba386 | 1443 | event_recorder); |
4ecb5ad5 | 1444 | break; |
b4a75708 | 1445 | |
606828e4 | 1446 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1447 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1448 | break; |
b4a75708 | 1449 | |
c190d76e MJ |
1450 | case LTTNG_KERNEL_ABI_KPROBE: |
1451 | lttng_fallthrough; | |
1452 | case LTTNG_KERNEL_ABI_UPROBE: | |
1453 | lttng_fallthrough; | |
606828e4 | 1454 | case LTTNG_KERNEL_ABI_KRETPROBE: |
4ecb5ad5 MD |
1455 | ret = 0; |
1456 | break; | |
b4a75708 | 1457 | |
c190d76e MJ |
1458 | case LTTNG_KERNEL_ABI_FUNCTION: |
1459 | lttng_fallthrough; | |
1460 | case LTTNG_KERNEL_ABI_NOOP: | |
1461 | lttng_fallthrough; | |
4ecb5ad5 MD |
1462 | default: |
1463 | WARN_ON_ONCE(1); | |
1464 | } | |
3c997079 | 1465 | if (!ret) |
a67ba386 | 1466 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1467 | } |
1468 | ||
4e3c1b9b MD |
1469 | /* |
1470 | * Only used internally at session destruction. | |
1471 | */ | |
a67ba386 | 1472 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1473 | { |
a67ba386 | 1474 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1475 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1476 | int ret = -EINVAL; |
1477 | ||
a67ba386 | 1478 | if (!event_priv->registered) |
3c997079 MD |
1479 | return 0; |
1480 | ||
a67ba386 MD |
1481 | desc = event_priv->desc; |
1482 | switch (event_priv->instrumentation) { | |
606828e4 | 1483 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1484 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1485 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1486 | event_recorder); |
baf20995 | 1487 | break; |
b4a75708 | 1488 | |
606828e4 | 1489 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1490 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1491 | ret = 0; |
1492 | break; | |
b4a75708 | 1493 | |
606828e4 | 1494 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1495 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1496 | ret = 0; |
1497 | break; | |
b4a75708 | 1498 | |
606828e4 | 1499 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1500 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1501 | break; |
b4a75708 | 1502 | |
606828e4 | 1503 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1504 | ret = 0; |
1505 | break; | |
b4a75708 | 1506 | |
606828e4 | 1507 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1508 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1509 | ret = 0; |
1510 | break; | |
b4a75708 | 1511 | |
c190d76e MJ |
1512 | case LTTNG_KERNEL_ABI_FUNCTION: |
1513 | lttng_fallthrough; | |
baf20995 MD |
1514 | default: |
1515 | WARN_ON_ONCE(1); | |
1516 | } | |
3c997079 | 1517 | if (!ret) |
a67ba386 | 1518 | event_priv->registered = 0; |
dda6a249 MD |
1519 | return ret; |
1520 | } | |
1521 | ||
dffef45d FD |
1522 | /* Only used for tracepoints for now. */ |
1523 | static | |
a67ba386 | 1524 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1525 | { |
437d5aa5 | 1526 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1527 | int ret = -EINVAL; |
1528 | ||
a67ba386 | 1529 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1530 | return; |
1531 | ||
a67ba386 MD |
1532 | desc = event_notifier->priv->parent.desc; |
1533 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1534 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1535 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1536 | desc->tp_class->probe_callback, |
b01155ba FD |
1537 | event_notifier); |
1538 | break; | |
b4a75708 | 1539 | |
606828e4 | 1540 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1541 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1542 | break; | |
b4a75708 | 1543 | |
c190d76e MJ |
1544 | case LTTNG_KERNEL_ABI_KPROBE: |
1545 | lttng_fallthrough; | |
606828e4 | 1546 | case LTTNG_KERNEL_ABI_UPROBE: |
2b16f0c9 FD |
1547 | ret = 0; |
1548 | break; | |
b4a75708 | 1549 | |
c190d76e MJ |
1550 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1551 | lttng_fallthrough; | |
1552 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1553 | lttng_fallthrough; | |
1554 | case LTTNG_KERNEL_ABI_NOOP: | |
1555 | lttng_fallthrough; | |
dffef45d FD |
1556 | default: |
1557 | WARN_ON_ONCE(1); | |
1558 | } | |
1559 | if (!ret) | |
a67ba386 | 1560 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1561 | } |
1562 | ||
1563 | static | |
1564 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1565 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1566 | { |
437d5aa5 | 1567 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1568 | int ret = -EINVAL; |
1569 | ||
a67ba386 | 1570 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1571 | return 0; |
1572 | ||
a67ba386 MD |
1573 | desc = event_notifier->priv->parent.desc; |
1574 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1575 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1576 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
6c8c025b | 1577 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1578 | event_notifier); |
1579 | break; | |
b4a75708 | 1580 | |
606828e4 | 1581 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1582 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1583 | ret = 0; | |
1584 | break; | |
b4a75708 | 1585 | |
606828e4 | 1586 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1587 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1588 | ret = 0; | |
1589 | break; | |
b4a75708 | 1590 | |
606828e4 | 1591 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1592 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1593 | break; | |
b4a75708 | 1594 | |
c190d76e MJ |
1595 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1596 | lttng_fallthrough; | |
1597 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1598 | lttng_fallthrough; | |
1599 | case LTTNG_KERNEL_ABI_NOOP: | |
1600 | lttng_fallthrough; | |
dffef45d FD |
1601 | default: |
1602 | WARN_ON_ONCE(1); | |
1603 | } | |
1604 | if (!ret) | |
a67ba386 | 1605 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1606 | return ret; |
1607 | } | |
1608 | ||
dda6a249 MD |
1609 | /* |
1610 | * Only used internally at session destruction. | |
1611 | */ | |
be066e6c | 1612 | static |
0648898e | 1613 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1614 | { |
0648898e | 1615 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1616 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1617 | ||
0648898e MD |
1618 | lttng_free_event_filter_runtime(event); |
1619 | /* Free event enabler refs */ | |
1620 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1621 | &event_priv->enablers_ref_head, node) | |
1622 | kfree(enabler_ref); | |
b4a75708 | 1623 | |
0648898e MD |
1624 | switch (event->type) { |
1625 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1626 | { | |
1627 | struct lttng_kernel_event_recorder *event_recorder = | |
1628 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1629 | |
0648898e MD |
1630 | switch (event_priv->instrumentation) { |
1631 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1632 | lttng_event_desc_put(event_priv->desc); | |
1633 | break; | |
b4a75708 | 1634 | |
0648898e MD |
1635 | case LTTNG_KERNEL_ABI_KPROBE: |
1636 | module_put(event_priv->desc->owner); | |
1637 | lttng_kprobes_destroy_event_private(event_recorder); | |
1638 | break; | |
b4a75708 | 1639 | |
0648898e MD |
1640 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1641 | module_put(event_priv->desc->owner); | |
1642 | lttng_kretprobes_destroy_private(event_recorder); | |
1643 | break; | |
b4a75708 | 1644 | |
0648898e MD |
1645 | case LTTNG_KERNEL_ABI_SYSCALL: |
1646 | break; | |
4e3c1b9b | 1647 | |
0648898e MD |
1648 | case LTTNG_KERNEL_ABI_UPROBE: |
1649 | module_put(event_priv->desc->owner); | |
1650 | lttng_uprobes_destroy_event_private(event_recorder); | |
1651 | break; | |
3ef5cc03 | 1652 | |
c190d76e MJ |
1653 | case LTTNG_KERNEL_ABI_FUNCTION: |
1654 | lttng_fallthrough; | |
1655 | case LTTNG_KERNEL_ABI_NOOP: | |
1656 | lttng_fallthrough; | |
0648898e MD |
1657 | default: |
1658 | WARN_ON_ONCE(1); | |
1659 | } | |
1660 | list_del(&event_recorder->priv->node); | |
1661 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1662 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1663 | break; |
0648898e MD |
1664 | } |
1665 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1666 | { | |
1667 | struct lttng_kernel_event_notifier *event_notifier = | |
1668 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1669 | |
0648898e MD |
1670 | switch (event_notifier->priv->parent.instrumentation) { |
1671 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1672 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1673 | break; | |
b4a75708 | 1674 | |
0648898e MD |
1675 | case LTTNG_KERNEL_ABI_KPROBE: |
1676 | module_put(event_notifier->priv->parent.desc->owner); | |
1677 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1678 | break; | |
b4a75708 | 1679 | |
0648898e MD |
1680 | case LTTNG_KERNEL_ABI_SYSCALL: |
1681 | break; | |
b4a75708 | 1682 | |
0648898e MD |
1683 | case LTTNG_KERNEL_ABI_UPROBE: |
1684 | module_put(event_notifier->priv->parent.desc->owner); | |
1685 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1686 | break; | |
1687 | ||
c190d76e MJ |
1688 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1689 | lttng_fallthrough; | |
1690 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1691 | lttng_fallthrough; | |
1692 | case LTTNG_KERNEL_ABI_NOOP: | |
1693 | lttng_fallthrough; | |
0648898e MD |
1694 | default: |
1695 | WARN_ON_ONCE(1); | |
1696 | } | |
1697 | list_del(&event_notifier->priv->node); | |
1698 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1699 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1700 | break; | |
1701 | } | |
dffef45d FD |
1702 | default: |
1703 | WARN_ON_ONCE(1); | |
1704 | } | |
dffef45d FD |
1705 | } |
1706 | ||
8c0393c3 | 1707 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1708 | enum tracker_type tracker_type) |
e0130fab | 1709 | { |
d1f652f8 MD |
1710 | switch (tracker_type) { |
1711 | case TRACKER_PID: | |
1712 | return &session->pid_tracker; | |
1713 | case TRACKER_VPID: | |
1714 | return &session->vpid_tracker; | |
1715 | case TRACKER_UID: | |
1716 | return &session->uid_tracker; | |
1717 | case TRACKER_VUID: | |
1718 | return &session->vuid_tracker; | |
1719 | case TRACKER_GID: | |
1720 | return &session->gid_tracker; | |
1721 | case TRACKER_VGID: | |
1722 | return &session->vgid_tracker; | |
1723 | default: | |
1724 | WARN_ON_ONCE(1); | |
1725 | return NULL; | |
1726 | } | |
1727 | } | |
1728 | ||
8cdc1a81 | 1729 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1730 | enum tracker_type tracker_type, int id) |
1731 | { | |
8c0393c3 | 1732 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1733 | int ret; |
1734 | ||
d1f652f8 MD |
1735 | tracker = get_tracker(session, tracker_type); |
1736 | if (!tracker) | |
1737 | return -EINVAL; | |
1738 | if (id < -1) | |
e0130fab MD |
1739 | return -EINVAL; |
1740 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1741 | if (id == -1) { |
1742 | /* track all ids: destroy tracker. */ | |
1743 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1744 | ret = 0; |
1745 | } else { | |
d1f652f8 | 1746 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1747 | } |
e0130fab MD |
1748 | mutex_unlock(&sessions_mutex); |
1749 | return ret; | |
1750 | } | |
1751 | ||
8cdc1a81 | 1752 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1753 | enum tracker_type tracker_type, int id) |
e0130fab | 1754 | { |
8c0393c3 | 1755 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1756 | int ret; |
1757 | ||
d1f652f8 MD |
1758 | tracker = get_tracker(session, tracker_type); |
1759 | if (!tracker) | |
1760 | return -EINVAL; | |
1761 | if (id < -1) | |
e0130fab MD |
1762 | return -EINVAL; |
1763 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1764 | if (id == -1) { |
1765 | /* untrack all ids: replace by empty tracker. */ | |
1766 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1767 | } else { |
d1f652f8 | 1768 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1769 | } |
e0130fab MD |
1770 | mutex_unlock(&sessions_mutex); |
1771 | return ret; | |
1772 | } | |
1773 | ||
7e6f9ef6 | 1774 | static |
d1f652f8 | 1775 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1776 | { |
8c0393c3 MD |
1777 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1778 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1779 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1780 | int iter = 0, i; |
1781 | ||
1782 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1783 | if (id_tracker_p) { |
1784 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1785 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1786 | |
f934e302 | 1787 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1788 | if (iter++ >= *pos) |
1789 | return e; | |
1790 | } | |
1791 | } | |
1792 | } else { | |
d1f652f8 | 1793 | /* ID tracker disabled. */ |
7e6f9ef6 | 1794 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1795 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1796 | } |
1797 | iter++; | |
1798 | } | |
1799 | /* End of list */ | |
1800 | return NULL; | |
1801 | } | |
1802 | ||
1803 | /* Called with sessions_mutex held. */ | |
1804 | static | |
d1f652f8 | 1805 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1806 | { |
8c0393c3 MD |
1807 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1808 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1809 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1810 | int iter = 0, i; |
1811 | ||
1812 | (*ppos)++; | |
d1f652f8 MD |
1813 | if (id_tracker_p) { |
1814 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1815 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1816 | |
f934e302 | 1817 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1818 | if (iter++ >= *ppos) |
1819 | return e; | |
1820 | } | |
1821 | } | |
1822 | } else { | |
d1f652f8 | 1823 | /* ID tracker disabled. */ |
7e6f9ef6 | 1824 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1825 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1826 | iter++; |
1827 | } | |
1828 | ||
1829 | /* End of list */ | |
1830 | return NULL; | |
1831 | } | |
1832 | ||
1833 | static | |
d1f652f8 | 1834 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1835 | { |
1836 | mutex_unlock(&sessions_mutex); | |
1837 | } | |
1838 | ||
1839 | static | |
d1f652f8 | 1840 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1841 | { |
8c0393c3 MD |
1842 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1843 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1844 | int id; |
7e6f9ef6 | 1845 | |
d1f652f8 | 1846 | if (p == id_tracker_p) { |
7e6f9ef6 | 1847 | /* Tracker disabled. */ |
d1f652f8 | 1848 | id = -1; |
7e6f9ef6 | 1849 | } else { |
d1f652f8 | 1850 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1851 | |
d1f652f8 MD |
1852 | id = lttng_id_tracker_get_node_id(e); |
1853 | } | |
8c0393c3 | 1854 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1855 | case TRACKER_PID: |
1856 | seq_printf(m, "process { pid = %d; };\n", id); | |
1857 | break; | |
1858 | case TRACKER_VPID: | |
1859 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1860 | break; | |
1861 | case TRACKER_UID: | |
1862 | seq_printf(m, "user { uid = %d; };\n", id); | |
1863 | break; | |
1864 | case TRACKER_VUID: | |
1865 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1866 | break; | |
1867 | case TRACKER_GID: | |
1868 | seq_printf(m, "group { gid = %d; };\n", id); | |
1869 | break; | |
1870 | case TRACKER_VGID: | |
1871 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1872 | break; | |
1873 | default: | |
1874 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1875 | } |
7e6f9ef6 MD |
1876 | return 0; |
1877 | } | |
1878 | ||
1879 | static | |
d1f652f8 MD |
1880 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1881 | .start = id_list_start, | |
1882 | .next = id_list_next, | |
1883 | .stop = id_list_stop, | |
1884 | .show = id_list_show, | |
7e6f9ef6 MD |
1885 | }; |
1886 | ||
1887 | static | |
d1f652f8 | 1888 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1889 | { |
d1f652f8 | 1890 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1891 | } |
1892 | ||
1893 | static | |
d1f652f8 | 1894 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1895 | { |
1896 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1897 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1898 | int ret; |
1899 | ||
d1f652f8 | 1900 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1901 | ret = seq_release(inode, file); |
d1f652f8 | 1902 | if (!ret) |
8c0393c3 | 1903 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1904 | return ret; |
1905 | } | |
1906 | ||
d1f652f8 | 1907 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1908 | .owner = THIS_MODULE, |
d1f652f8 | 1909 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1910 | .read = seq_read, |
1911 | .llseek = seq_lseek, | |
d1f652f8 | 1912 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1913 | }; |
1914 | ||
8cdc1a81 | 1915 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1916 | enum tracker_type tracker_type) |
7e6f9ef6 | 1917 | { |
d1f652f8 | 1918 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1919 | struct seq_file *m; |
1920 | int file_fd, ret; | |
1921 | ||
1922 | file_fd = lttng_get_unused_fd(); | |
1923 | if (file_fd < 0) { | |
1924 | ret = file_fd; | |
1925 | goto fd_error; | |
1926 | } | |
1927 | ||
d1f652f8 MD |
1928 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1929 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1930 | NULL, O_RDWR); |
d1f652f8 MD |
1931 | if (IS_ERR(tracker_ids_list_file)) { |
1932 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1933 | goto file_error; |
1934 | } | |
8cdc1a81 | 1935 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1936 | ret = -EOVERFLOW; |
9c1f4643 MD |
1937 | goto refcount_error; |
1938 | } | |
d1f652f8 | 1939 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1940 | if (ret < 0) |
1941 | goto open_error; | |
d1f652f8 MD |
1942 | m = tracker_ids_list_file->private_data; |
1943 | ||
1944 | m->private = get_tracker(session, tracker_type); | |
1945 | BUG_ON(!m->private); | |
1946 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1947 | |
1948 | return file_fd; | |
1949 | ||
1950 | open_error: | |
8cdc1a81 | 1951 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1952 | refcount_error: |
d1f652f8 | 1953 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1954 | file_error: |
1955 | put_unused_fd(file_fd); | |
1956 | fd_error: | |
1957 | return ret; | |
1958 | } | |
1959 | ||
3c997079 MD |
1960 | /* |
1961 | * Enabler management. | |
1962 | */ | |
1963 | static | |
4993071a PP |
1964 | int lttng_match_enabler_star_glob(const char *desc_name, |
1965 | const char *pattern) | |
3c997079 | 1966 | { |
cbc19040 MD |
1967 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1968 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1969 | return 0; |
1970 | return 1; | |
1971 | } | |
1972 | ||
1973 | static | |
4ecb5ad5 MD |
1974 | int lttng_match_enabler_name(const char *desc_name, |
1975 | const char *name) | |
3c997079 | 1976 | { |
4ecb5ad5 | 1977 | if (strcmp(desc_name, name)) |
3c997079 MD |
1978 | return 0; |
1979 | return 1; | |
1980 | } | |
1981 | ||
437d5aa5 | 1982 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1983 | struct lttng_enabler *enabler) |
1984 | { | |
4ecb5ad5 | 1985 | const char *desc_name, *enabler_name; |
badfe9f5 | 1986 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1987 | |
1988 | enabler_name = enabler->event_param.name; | |
1989 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1990 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1991 | desc_name = desc->event_name; |
3b861b22 FD |
1992 | switch (enabler->format_type) { |
1993 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1994 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1995 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1996 | return lttng_match_enabler_name(desc_name, enabler_name); |
1997 | default: | |
1998 | return -EINVAL; | |
1999 | } | |
4ecb5ad5 | 2000 | break; |
b4a75708 | 2001 | |
606828e4 | 2002 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2003 | desc_name = desc->event_name; |
badfe9f5 | 2004 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2005 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2006 | compat = true; |
2007 | } | |
4ecb5ad5 MD |
2008 | if (!strncmp(desc_name, "syscall_exit_", |
2009 | strlen("syscall_exit_"))) { | |
2010 | desc_name += strlen("syscall_exit_"); | |
2011 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2012 | strlen("syscall_entry_"))) { | |
2013 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2014 | entry = true; |
4ecb5ad5 MD |
2015 | } else { |
2016 | WARN_ON_ONCE(1); | |
2017 | return -EINVAL; | |
2018 | } | |
badfe9f5 | 2019 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2020 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2021 | break; |
606828e4 | 2022 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2023 | if (!entry) |
2024 | return 0; | |
2025 | break; | |
606828e4 | 2026 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2027 | if (entry) |
2028 | return 0; | |
2029 | break; | |
2030 | default: | |
2031 | return -EINVAL; | |
2032 | } | |
2033 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2034 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2035 | break; |
606828e4 | 2036 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2037 | if (compat) |
2038 | return 0; | |
2039 | break; | |
606828e4 | 2040 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2041 | if (!compat) |
2042 | return 0; | |
2043 | break; | |
2044 | default: | |
2045 | return -EINVAL; | |
2046 | } | |
2047 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2048 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2049 | switch (enabler->format_type) { |
2050 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2051 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2052 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2053 | return lttng_match_enabler_name(desc_name, enabler_name); |
2054 | default: | |
2055 | return -EINVAL; | |
2056 | } | |
2057 | break; | |
606828e4 | 2058 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2059 | return -EINVAL; /* Not implemented. */ |
2060 | default: | |
2061 | return -EINVAL; | |
2062 | } | |
4ecb5ad5 | 2063 | break; |
b4a75708 | 2064 | |
4ecb5ad5 MD |
2065 | default: |
2066 | WARN_ON_ONCE(1); | |
2067 | return -EINVAL; | |
2068 | } | |
3c997079 MD |
2069 | } |
2070 | ||
2071 | static | |
b2bc0bc8 | 2072 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2073 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2074 | { |
b2bc0bc8 FD |
2075 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2076 | event_enabler); | |
2077 | ||
a67ba386 | 2078 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2079 | return 0; |
a67ba386 MD |
2080 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2081 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2082 | return 1; |
2083 | else | |
2084 | return 0; | |
2085 | } | |
2086 | ||
b01155ba FD |
2087 | static |
2088 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2089 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2090 | { |
2091 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2092 | event_notifier_enabler); | |
2093 | ||
a67ba386 | 2094 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2095 | return 0; |
a67ba386 MD |
2096 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2097 | && event_notifier->priv->group == event_notifier_enabler->group | |
2098 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2099 | return 1; |
2100 | else | |
2101 | return 0; | |
2102 | } | |
2103 | ||
3c997079 | 2104 | static |
b2bc0bc8 FD |
2105 | struct lttng_enabler_ref *lttng_enabler_ref( |
2106 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2107 | struct lttng_enabler *enabler) |
2108 | { | |
2109 | struct lttng_enabler_ref *enabler_ref; | |
2110 | ||
b2bc0bc8 | 2111 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2112 | if (enabler_ref->ref == enabler) |
2113 | return enabler_ref; | |
2114 | } | |
2115 | return NULL; | |
2116 | } | |
2117 | ||
3c997079 | 2118 | static |
1b917d6b | 2119 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2120 | { |
f7d06400 | 2121 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2122 | struct lttng_kernel_probe_desc *probe_desc; |
2123 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2124 | int i; |
2125 | struct list_head *probe_list; | |
2126 | ||
2127 | probe_list = lttng_get_probe_list_head(); | |
2128 | /* | |
2129 | * For each probe event, if we find that a probe event matches | |
2130 | * our enabler, create an associated lttng_event if not | |
2131 | * already present. | |
2132 | */ | |
2133 | list_for_each_entry(probe_desc, probe_list, head) { | |
2134 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2135 | int found = 0; | |
2136 | struct hlist_head *head; | |
a67ba386 MD |
2137 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2138 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2139 | |
2140 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2141 | if (!lttng_desc_match_enabler(desc, |
2142 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2143 | continue; |
3c997079 MD |
2144 | |
2145 | /* | |
2146 | * Check if already created. | |
2147 | */ | |
4a11ef1c | 2148 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 2149 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2150 | desc->event_name); |
a67ba386 MD |
2151 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2152 | if (event_recorder_private->parent.desc == desc | |
2153 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2154 | found = 1; |
2155 | } | |
2156 | if (found) | |
2157 | continue; | |
2158 | ||
2159 | /* | |
2160 | * We need to create an event for this | |
2161 | * event probe. | |
2162 | */ | |
a67ba386 MD |
2163 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2164 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2165 | if (!event_recorder) { | |
5a15f70c | 2166 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2167 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2168 | } |
2169 | } | |
2170 | } | |
2171 | } | |
2172 | ||
b01155ba FD |
2173 | static |
2174 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2175 | { | |
2176 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2177 | struct lttng_kernel_probe_desc *probe_desc; |
2178 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2179 | int i; |
2180 | struct list_head *probe_list; | |
2181 | ||
2182 | probe_list = lttng_get_probe_list_head(); | |
2183 | /* | |
2184 | * For each probe event, if we find that a probe event matches | |
2185 | * our enabler, create an associated lttng_event_notifier if not | |
2186 | * already present. | |
2187 | */ | |
2188 | list_for_each_entry(probe_desc, probe_list, head) { | |
2189 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2190 | int found = 0; | |
2191 | struct hlist_head *head; | |
a67ba386 MD |
2192 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2193 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2194 | |
2195 | desc = probe_desc->event_desc[i]; | |
2196 | if (!lttng_desc_match_enabler(desc, | |
2197 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2198 | continue; | |
2199 | ||
2200 | /* | |
2201 | * Check if already created. | |
2202 | */ | |
2203 | head = utils_borrow_hash_table_bucket( | |
2204 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2205 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2206 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2207 | if (event_notifier_priv->parent.desc == desc | |
2208 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2209 | found = 1; |
2210 | } | |
2211 | if (found) | |
2212 | continue; | |
2213 | ||
2214 | /* | |
2215 | * We need to create a event_notifier for this event probe. | |
2216 | */ | |
2217 | event_notifier = _lttng_event_notifier_create(desc, | |
2218 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2219 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2220 | event_notifier_group, NULL, |
606828e4 | 2221 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2222 | if (IS_ERR(event_notifier)) { |
2223 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2224 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2225 | } |
2226 | } | |
2227 | } | |
2228 | } | |
2229 | ||
33a39a3c | 2230 | static |
1b917d6b | 2231 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2232 | { |
2233 | int ret; | |
2234 | ||
a67ba386 | 2235 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2236 | WARN_ON_ONCE(ret); |
2237 | } | |
2238 | ||
8a8ac9a8 FD |
2239 | static |
2240 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2241 | { | |
2242 | int ret; | |
2243 | ||
a67ba386 | 2244 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2245 | WARN_ON_ONCE(ret); |
a67ba386 | 2246 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2247 | WARN_ON_ONCE(ret); |
2248 | } | |
2249 | ||
33a39a3c | 2250 | /* |
a67ba386 | 2251 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2252 | * tracepoint probes. |
2253 | * Should be called with sessions mutex held. | |
2254 | */ | |
2255 | static | |
b2bc0bc8 | 2256 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2257 | { |
b2bc0bc8 | 2258 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2259 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2260 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2261 | break; |
b4a75708 | 2262 | |
606828e4 | 2263 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2264 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2265 | break; |
b4a75708 | 2266 | |
33a39a3c MD |
2267 | default: |
2268 | WARN_ON_ONCE(1); | |
2269 | break; | |
2270 | } | |
2271 | } | |
2272 | ||
3c997079 | 2273 | /* |
b2bc0bc8 | 2274 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2275 | * and add backward reference from the event to the enabler. |
2276 | * Should be called with sessions mutex held. | |
2277 | */ | |
2278 | static | |
b2bc0bc8 | 2279 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2280 | { |
f7d06400 MD |
2281 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2282 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2283 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2284 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2285 | |
606828e4 MD |
2286 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2287 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2288 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2289 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2290 | int enabled = base_enabler->enabled; |
606828e4 | 2291 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2292 | |
606828e4 | 2293 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
f7d06400 | 2294 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2295 | |
606828e4 | 2296 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
f7d06400 | 2297 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2298 | } |
2299 | ||
3c997079 | 2300 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2301 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2302 | |
b2bc0bc8 | 2303 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2304 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2305 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2306 | struct lttng_enabler_ref *enabler_ref; |
2307 | ||
a67ba386 | 2308 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2309 | continue; |
a67ba386 | 2310 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2311 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2312 | if (!enabler_ref) { |
2313 | /* | |
2314 | * If no backward ref, create it. | |
b2bc0bc8 | 2315 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2316 | */ |
2317 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2318 | if (!enabler_ref) | |
2319 | return -ENOMEM; | |
b2bc0bc8 | 2320 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2321 | list_add(&enabler_ref->node, |
a67ba386 | 2322 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2323 | } |
2324 | ||
f127e61e MD |
2325 | /* |
2326 | * Link filter bytecodes if not linked yet. | |
2327 | */ | |
a67ba386 | 2328 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2329 | lttng_static_ctx, |
a67ba386 | 2330 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2331 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2332 | } |
2333 | return 0; | |
2334 | } | |
2335 | ||
b01155ba | 2336 | /* |
a67ba386 | 2337 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2338 | * tracepoint probes. |
2339 | * Should be called with sessions mutex held. | |
2340 | */ | |
2341 | static | |
2342 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2343 | { | |
2344 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2345 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2346 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2347 | break; | |
b4a75708 | 2348 | |
606828e4 | 2349 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2350 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2351 | break; | |
b4a75708 | 2352 | |
b01155ba FD |
2353 | default: |
2354 | WARN_ON_ONCE(1); | |
2355 | break; | |
2356 | } | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2361 | */ | |
2362 | static | |
8a8ac9a8 FD |
2363 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2364 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2365 | { |
2366 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2367 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2368 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2369 | |
606828e4 MD |
2370 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2371 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2372 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2373 | !strcmp(base_enabler->event_param.name, "*")) { |
2374 | ||
2375 | int enabled = base_enabler->enabled; | |
606828e4 | 2376 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2377 | |
606828e4 | 2378 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2379 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2380 | ||
606828e4 | 2381 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2382 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2383 | ||
2384 | } | |
2385 | ||
b01155ba FD |
2386 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2387 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2388 | ||
2389 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2390 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2391 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2392 | struct lttng_enabler_ref *enabler_ref; |
2393 | ||
2394 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2395 | continue; | |
2396 | ||
a67ba386 | 2397 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2398 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2399 | if (!enabler_ref) { | |
2400 | /* | |
2401 | * If no backward ref, create it. | |
2402 | * Add backward ref from event_notifier to enabler. | |
2403 | */ | |
2404 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2405 | if (!enabler_ref) | |
2406 | return -ENOMEM; | |
2407 | ||
2408 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2409 | event_notifier_enabler); | |
2410 | list_add(&enabler_ref->node, | |
a67ba386 | 2411 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2412 | } |
2413 | ||
2414 | /* | |
2415 | * Link filter bytecodes if not linked yet. | |
2416 | */ | |
a67ba386 MD |
2417 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2418 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2419 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2420 | |
2421 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2422 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2423 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2424 | &event_notifier_enabler->capture_bytecode_head); |
2425 | ||
a67ba386 | 2426 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2427 | } |
2428 | return 0; | |
2429 | } | |
2430 | ||
3c997079 MD |
2431 | /* |
2432 | * Called at module load: connect the probe on all enablers matching | |
2433 | * this event. | |
2434 | * Called with sessions lock held. | |
2435 | */ | |
2436 | int lttng_fix_pending_events(void) | |
2437 | { | |
8cdc1a81 | 2438 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2439 | |
8cdc1a81 MD |
2440 | list_for_each_entry(session_priv, &sessions, list) |
2441 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2442 | return 0; |
2443 | } | |
2444 | ||
b01155ba FD |
2445 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2446 | struct lttng_event_notifier_group *event_notifier_group) | |
2447 | { | |
2448 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2449 | ||
2450 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2451 | node) { | |
2452 | if (event_notifier_enabler->base.enabled) | |
2453 | return true; | |
2454 | } | |
2455 | return false; | |
2456 | } | |
2457 | ||
2458 | bool lttng_event_notifier_active(void) | |
2459 | { | |
2460 | struct lttng_event_notifier_group *event_notifier_group; | |
2461 | ||
2462 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2463 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2464 | return true; | |
2465 | } | |
2466 | return false; | |
2467 | } | |
2468 | ||
2469 | int lttng_fix_pending_event_notifiers(void) | |
2470 | { | |
2471 | struct lttng_event_notifier_group *event_notifier_group; | |
2472 | ||
2473 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2474 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2475 | return 0; | |
2476 | } | |
2477 | ||
b2bc0bc8 FD |
2478 | struct lttng_event_enabler *lttng_event_enabler_create( |
2479 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2480 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2481 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2482 | { |
b2bc0bc8 | 2483 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2484 | |
b2bc0bc8 FD |
2485 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2486 | if (!event_enabler) | |
3c997079 | 2487 | return NULL; |
b2bc0bc8 FD |
2488 | event_enabler->base.format_type = format_type; |
2489 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2490 | memcpy(&event_enabler->base.event_param, event_param, | |
2491 | sizeof(event_enabler->base.event_param)); | |
2492 | event_enabler->chan = chan; | |
3c997079 | 2493 | /* ctx left NULL */ |
b2bc0bc8 | 2494 | event_enabler->base.enabled = 0; |
3c997079 | 2495 | mutex_lock(&sessions_mutex); |
f7d06400 MD |
2496 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2497 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2498 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2499 | return event_enabler; |
3c997079 MD |
2500 | } |
2501 | ||
b2bc0bc8 | 2502 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2503 | { |
2504 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2505 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
f7d06400 | 2506 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2507 | mutex_unlock(&sessions_mutex); |
2508 | return 0; | |
2509 | } | |
2510 | ||
b2bc0bc8 | 2511 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2512 | { |
2513 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2514 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
f7d06400 | 2515 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2516 | mutex_unlock(&sessions_mutex); |
2517 | return 0; | |
2518 | } | |
2519 | ||
b2bc0bc8 | 2520 | static |
183e8b3a | 2521 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2522 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2523 | { |
d64ca521 | 2524 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2525 | uint32_t bytecode_len; |
2526 | int ret; | |
2527 | ||
2528 | ret = get_user(bytecode_len, &bytecode->len); | |
2529 | if (ret) | |
2530 | return ret; | |
52cfcdf3 | 2531 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2532 | GFP_KERNEL); |
2533 | if (!bytecode_node) | |
2534 | return -ENOMEM; | |
2535 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2536 | sizeof(*bytecode) + bytecode_len); | |
2537 | if (ret) | |
2538 | goto error_free; | |
b2bc0bc8 | 2539 | |
8a445457 | 2540 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2541 | bytecode_node->enabler = enabler; |
2542 | /* Enforce length based on allocated size */ | |
2543 | bytecode_node->bc.len = bytecode_len; | |
2544 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2545 | |
07dfc1d0 MD |
2546 | return 0; |
2547 | ||
2548 | error_free: | |
52cfcdf3 | 2549 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2550 | return ret; |
2551 | } | |
2552 | ||
183e8b3a | 2553 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2554 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2555 | { |
2556 | int ret; | |
183e8b3a | 2557 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2558 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2559 | if (ret) | |
2560 | goto error; | |
2561 | ||
f7d06400 | 2562 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2563 | return 0; |
2564 | ||
2565 | error: | |
2566 | return ret; | |
2567 | } | |
2568 | ||
e2d5dbc7 | 2569 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2570 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2571 | { |
2572 | ||
e2d5dbc7 | 2573 | switch (event->priv->instrumentation) { |
606828e4 | 2574 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2575 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2576 | default: |
2577 | return -EINVAL; | |
2578 | } | |
2579 | } | |
2580 | ||
3c997079 MD |
2581 | static |
2582 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2583 | { | |
d64ca521 | 2584 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2585 | |
2586 | /* Destroy filter bytecode */ | |
2587 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2588 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2589 | lttng_kvfree(filter_node); |
07dfc1d0 | 2590 | } |
b2bc0bc8 FD |
2591 | } |
2592 | ||
2593 | static | |
2594 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2595 | { | |
2596 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2597 | |
b2bc0bc8 FD |
2598 | list_del(&event_enabler->node); |
2599 | kfree(event_enabler); | |
3c997079 MD |
2600 | } |
2601 | ||
dffef45d FD |
2602 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2603 | struct lttng_event_notifier_group *event_notifier_group, | |
2604 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2605 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2606 | { |
2607 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2608 | ||
2609 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2610 | if (!event_notifier_enabler) | |
2611 | return NULL; | |
2612 | ||
2613 | event_notifier_enabler->base.format_type = format_type; | |
2614 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2615 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2616 | ||
99f52fcc | 2617 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2618 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2619 | |
8a8ac9a8 FD |
2620 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2621 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2622 | |
2623 | event_notifier_enabler->base.enabled = 0; | |
2624 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2625 | event_notifier_enabler->group = event_notifier_group; | |
2626 | ||
2627 | mutex_lock(&sessions_mutex); | |
2628 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2629 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2630 | |
2631 | mutex_unlock(&sessions_mutex); | |
2632 | ||
2633 | return event_notifier_enabler; | |
2634 | } | |
2635 | ||
2636 | int lttng_event_notifier_enabler_enable( | |
2637 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2638 | { | |
2639 | mutex_lock(&sessions_mutex); | |
2640 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2641 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2642 | mutex_unlock(&sessions_mutex); |
2643 | return 0; | |
2644 | } | |
2645 | ||
2646 | int lttng_event_notifier_enabler_disable( | |
2647 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2648 | { | |
2649 | mutex_lock(&sessions_mutex); | |
2650 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2651 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2652 | mutex_unlock(&sessions_mutex); |
2653 | return 0; | |
2654 | } | |
2655 | ||
183e8b3a | 2656 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2657 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2658 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2659 | { |
2660 | int ret; | |
2661 | ||
183e8b3a | 2662 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2663 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2664 | bytecode); | |
2665 | if (ret) | |
2666 | goto error; | |
2667 | ||
b01155ba | 2668 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2669 | return 0; |
2670 | ||
2671 | error: | |
2672 | return ret; | |
2673 | } | |
2674 | ||
99d223ad FD |
2675 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2676 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2677 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2678 | { |
d64ca521 | 2679 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2680 | struct lttng_enabler *enabler = |
2681 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2682 | uint32_t bytecode_len; | |
2683 | int ret; | |
2684 | ||
2685 | ret = get_user(bytecode_len, &bytecode->len); | |
2686 | if (ret) | |
2687 | return ret; | |
2688 | ||
2689 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2690 | GFP_KERNEL); | |
2691 | if (!bytecode_node) | |
2692 | return -ENOMEM; | |
2693 | ||
2694 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2695 | sizeof(*bytecode) + bytecode_len); | |
2696 | if (ret) | |
2697 | goto error_free; | |
2698 | ||
8a445457 | 2699 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2700 | bytecode_node->enabler = enabler; |
2701 | ||
2702 | /* Enforce length based on allocated size */ | |
2703 | bytecode_node->bc.len = bytecode_len; | |
2704 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2705 | ||
2706 | event_notifier_enabler->num_captures++; | |
2707 | ||
2708 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2709 | goto end; | |
2710 | ||
2711 | error_free: | |
2712 | lttng_kvfree(bytecode_node); | |
2713 | end: | |
2714 | return ret; | |
2715 | } | |
2716 | ||
dffef45d FD |
2717 | static |
2718 | void lttng_event_notifier_enabler_destroy( | |
2719 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2720 | { | |
2721 | if (!event_notifier_enabler) { | |
2722 | return; | |
2723 | } | |
2724 | ||
2725 | list_del(&event_notifier_enabler->node); | |
2726 | ||
2727 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2728 | kfree(event_notifier_enabler); | |
2729 | } | |
2730 | ||
3c997079 | 2731 | /* |
b2bc0bc8 | 2732 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2733 | * session. |
2734 | * Should be called with sessions mutex held. | |
2735 | */ | |
2736 | static | |
8cdc1a81 | 2737 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2738 | { |
b2bc0bc8 | 2739 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2740 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2741 | |
8cdc1a81 | 2742 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2743 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2744 | /* |
2745 | * For each event, if at least one of its enablers is enabled, | |
2746 | * and its channel and session transient states are enabled, we | |
2747 | * enable the event, else we disable it. | |
2748 | */ | |
8cdc1a81 | 2749 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2750 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2751 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2752 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2753 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2754 | int nr_filters = 0; | |
3c997079 | 2755 | |
a67ba386 | 2756 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2757 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2758 | lttng_fallthrough; | |
606828e4 | 2759 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2760 | /* Enable events */ |
2761 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2762 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2763 | if (enabler_ref->ref->enabled) { |
2764 | enabled = 1; | |
2765 | break; | |
2766 | } | |
2767 | } | |
4ecb5ad5 | 2768 | break; |
b4a75708 | 2769 | |
4ecb5ad5 | 2770 | default: |
3c997079 MD |
2771 | /* Not handled with lazy sync. */ |
2772 | continue; | |
2773 | } | |
2774 | /* | |
2775 | * Enabled state is based on union of enablers, with | |
2776 | * intesection of session and channel transient enable | |
2777 | * states. | |
2778 | */ | |
f7d06400 | 2779 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2780 | |
a67ba386 | 2781 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2782 | /* |
2783 | * Sync tracepoint registration with event enabled | |
2784 | * state. | |
2785 | */ | |
2786 | if (enabled) { | |
a67ba386 | 2787 | register_event(event_recorder); |
3c997079 | 2788 | } else { |
a67ba386 | 2789 | _lttng_event_unregister(event_recorder); |
3c997079 | 2790 | } |
07dfc1d0 MD |
2791 | |
2792 | /* Check if has enablers without bytecode enabled */ | |
2793 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2794 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2795 | if (enabler_ref->ref->enabled |
2796 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2797 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2798 | break; |
2799 | } | |
2800 | } | |
a67ba386 | 2801 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2802 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2803 | |
2804 | /* Enable filters */ | |
2805 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2806 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2807 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2808 | nr_filters++; |
2809 | } | |
2810 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2811 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2812 | } |
2813 | } | |
2814 | ||
2815 | /* | |
2816 | * Apply enablers to session events, adding events to session if need | |
2817 | * be. It is required after each modification applied to an active | |
2818 | * session, and right before session "start". | |
2819 | * "lazy" sync means we only sync if required. | |
2820 | * Should be called with sessions mutex held. | |
2821 | */ | |
2822 | static | |
8cdc1a81 | 2823 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2824 | { |
2825 | /* We can skip if session is not active */ | |
2826 | if (!session->active) | |
2827 | return; | |
b2bc0bc8 | 2828 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2829 | } |
2830 | ||
b01155ba FD |
2831 | static |
2832 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2833 | { | |
2834 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2835 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2836 | |
2837 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2838 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2839 | ||
2840 | /* | |
2841 | * For each event_notifier, if at least one of its enablers is enabled, | |
2842 | * we enable the event_notifier, else we disable it. | |
2843 | */ | |
a67ba386 MD |
2844 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2845 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2846 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2847 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2848 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2849 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2850 | |
a67ba386 | 2851 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2852 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2853 | lttng_fallthrough; | |
606828e4 | 2854 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2855 | /* Enable event_notifiers */ |
2856 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2857 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2858 | if (enabler_ref->ref->enabled) { |
2859 | enabled = 1; | |
2860 | break; | |
2861 | } | |
2862 | } | |
2863 | break; | |
b4a75708 | 2864 | |
b01155ba FD |
2865 | default: |
2866 | /* Not handled with sync. */ | |
2867 | continue; | |
2868 | } | |
2869 | ||
a67ba386 | 2870 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2871 | /* |
2872 | * Sync tracepoint registration with event_notifier enabled | |
2873 | * state. | |
2874 | */ | |
2875 | if (enabled) { | |
a67ba386 | 2876 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2877 | register_event_notifier(event_notifier); |
2878 | } else { | |
a67ba386 | 2879 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2880 | _lttng_event_notifier_unregister(event_notifier); |
2881 | } | |
2882 | ||
2883 | /* Check if has enablers without bytecode enabled */ | |
2884 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2885 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2886 | if (enabler_ref->ref->enabled |
2887 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2888 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2889 | break; |
2890 | } | |
2891 | } | |
a67ba386 | 2892 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2893 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2894 | |
2895 | /* Enable filters */ | |
2896 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2897 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2898 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2899 | nr_filters++; |
2900 | } | |
2901 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2902 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2903 | |
2904 | /* Enable captures */ | |
2905 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2906 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2907 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2908 | nr_captures++; |
2909 | } | |
2910 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2911 | } |
2912 | } | |
2913 | ||
1ec3f75a | 2914 | /* |
d83004aa JD |
2915 | * Serialize at most one packet worth of metadata into a metadata |
2916 | * channel. | |
92d9f5e6 MD |
2917 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2918 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2919 | * allows us to do racy operations such as looking for remaining space left in | |
2920 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2921 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2922 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2923 | * Returns the number of bytes written in the channel, 0 if no data |
2924 | * was written and a negative value on error. | |
1ec3f75a | 2925 | */ |
b3b8072b | 2926 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2927 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2928 | { |
8a57ec02 | 2929 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2930 | int ret = 0; |
2931 | size_t len, reserve_len; | |
2932 | ||
f613e3e6 | 2933 | /* |
92d9f5e6 MD |
2934 | * Ensure we support mutiple get_next / put sequences followed by |
2935 | * put_next. The metadata cache lock protects reading the metadata | |
2936 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2937 | * "flush" operations on the buffer invoked by different processes. | |
2938 | * Moreover, since the metadata cache memory can be reallocated, we | |
2939 | * need to have exclusive access against updates even though we only | |
2940 | * read it. | |
f613e3e6 | 2941 | */ |
92d9f5e6 | 2942 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2943 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2944 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2945 | goto end; |
f613e3e6 | 2946 | |
9616f0bf JD |
2947 | /* Metadata regenerated, change the version. */ |
2948 | if (stream->metadata_cache->version != stream->version) | |
2949 | stream->version = stream->metadata_cache->version; | |
2950 | ||
d83004aa | 2951 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2952 | stream->metadata_in; |
9de2c215 | 2953 | if (!len) |
de23d59d | 2954 | goto end; |
d83004aa | 2955 | reserve_len = min_t(size_t, |
4a399b76 | 2956 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2957 | len); |
a775608d | 2958 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2959 | sizeof(char), NULL); |
d83004aa JD |
2960 | /* |
2961 | * If reservation failed, return an error to the caller. | |
2962 | */ | |
c2fb9c1c | 2963 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2964 | if (ret != 0) { |
2965 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2966 | stream->coherent = false; |
d83004aa JD |
2967 | goto end; |
2968 | } | |
b3b8072b | 2969 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2970 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2971 | reserve_len, 1); |
b3b8072b | 2972 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2973 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2974 | if (reserve_len < len) |
8b97fd42 MD |
2975 | stream->coherent = false; |
2976 | else | |
2977 | stream->coherent = true; | |
d83004aa JD |
2978 | ret = reserve_len; |
2979 | ||
2980 | end: | |
8b97fd42 MD |
2981 | if (coherent) |
2982 | *coherent = stream->coherent; | |
92d9f5e6 | 2983 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2984 | return ret; |
2985 | } | |
2986 | ||
8b97fd42 | 2987 | static |
8cdc1a81 | 2988 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2989 | { |
8cdc1a81 MD |
2990 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2991 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2992 | } |
2993 | ||
2994 | static | |
8cdc1a81 | 2995 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2996 | { |
8cdc1a81 MD |
2997 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2998 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2999 | struct lttng_metadata_stream *stream; |
3000 | ||
8cdc1a81 | 3001 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3002 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 3003 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3004 | } |
8b97fd42 MD |
3005 | } |
3006 | ||
d83004aa JD |
3007 | /* |
3008 | * Write the metadata to the metadata cache. | |
3009 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3010 | * The metadata cache lock protects us from concurrent read access from |
3011 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3012 | * The content of the printf is printed as a single atomic metadata |
3013 | * transaction. | |
d83004aa | 3014 | */ |
8cdc1a81 | 3015 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3016 | const char *fmt, ...) |
3017 | { | |
c099397a | 3018 | char *str; |
d83004aa | 3019 | size_t len; |
c099397a MD |
3020 | va_list ap; |
3021 | ||
585e5dcc | 3022 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3023 | |
3024 | va_start(ap, fmt); | |
3025 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3026 | va_end(ap); | |
3027 | if (!str) | |
3028 | return -ENOMEM; | |
3029 | ||
1ec3f75a | 3030 | len = strlen(str); |
8cdc1a81 MD |
3031 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3032 | if (session->priv->metadata_cache->metadata_written + len > | |
3033 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3034 | char *tmp_cache_realloc; |
3035 | unsigned int tmp_cache_alloc_size; | |
3036 | ||
3037 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3038 | session->priv->metadata_cache->cache_alloc + len, |
3039 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3040 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3041 | if (!tmp_cache_realloc) |
3042 | goto err; | |
8cdc1a81 | 3043 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3044 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3045 | session->priv->metadata_cache->data, |
3046 | session->priv->metadata_cache->cache_alloc); | |
3047 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3048 | } |
3049 | ||
8cdc1a81 MD |
3050 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3051 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3052 | } |
8cdc1a81 MD |
3053 | memcpy(session->priv->metadata_cache->data + |
3054 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3055 | str, len); |
8cdc1a81 | 3056 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3057 | kfree(str); |
d83004aa | 3058 | |
d83004aa JD |
3059 | return 0; |
3060 | ||
3061 | err: | |
3062 | kfree(str); | |
3063 | return -ENOMEM; | |
c099397a MD |
3064 | } |
3065 | ||
f513b2bf | 3066 | static |
8cdc1a81 | 3067 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3068 | { |
3069 | size_t i; | |
3070 | ||
3071 | for (i = 0; i < nesting; i++) { | |
3072 | int ret; | |
3073 | ||
3074 | ret = lttng_metadata_printf(session, " "); | |
3075 | if (ret) { | |
3076 | return ret; | |
3077 | } | |
3078 | } | |
3079 | return 0; | |
3080 | } | |
3081 | ||
ceabb767 | 3082 | static |
8cdc1a81 | 3083 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3084 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3085 | size_t nesting) |
3086 | { | |
3087 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3088 | } | |
3089 | ||
3090 | static | |
8cdc1a81 | 3091 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3092 | const struct lttng_kernel_type_integer *type, |
3093 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3094 | size_t nesting) |
3095 | { | |
3096 | int ret; | |
3097 | ||
ceabb767 MD |
3098 | ret = print_tabs(session, nesting); |
3099 | if (ret) | |
3100 | return ret; | |
3101 | ret = lttng_metadata_printf(session, | |
3102 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3103 | type->size, |
3104 | type->alignment, | |
3105 | type->signedness, | |
3106 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3107 | ? "none" |
437d5aa5 | 3108 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3109 | ? "UTF8" |
3110 | : "ASCII", | |
437d5aa5 | 3111 | type->base, |
ceabb767 | 3112 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3113 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3114 | #else |
437d5aa5 | 3115 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3116 | #endif |
3117 | ); | |
3118 | return ret; | |
3119 | } | |
3120 | ||
f513b2bf MD |
3121 | /* |
3122 | * Must be called with sessions_mutex held. | |
3123 | */ | |
3124 | static | |
8cdc1a81 | 3125 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3126 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3127 | size_t nesting) |
3128 | { | |
51ef4536 | 3129 | const char *prev_field_name = NULL; |
f513b2bf MD |
3130 | int ret; |
3131 | uint32_t i, nr_fields; | |
ceabb767 MD |
3132 | unsigned int alignment; |
3133 | ||
f513b2bf MD |
3134 | ret = print_tabs(session, nesting); |
3135 | if (ret) | |
3136 | return ret; | |
3137 | ret = lttng_metadata_printf(session, | |
3138 | "struct {\n"); | |
3139 | if (ret) | |
3140 | return ret; | |
437d5aa5 | 3141 | nr_fields = type->nr_fields; |
f513b2bf | 3142 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3143 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3144 | |
437d5aa5 | 3145 | iter_field = type->fields[i]; |
51ef4536 | 3146 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3147 | if (ret) |
3148 | return ret; | |
3149 | } | |
3150 | ret = print_tabs(session, nesting); | |
3151 | if (ret) | |
3152 | return ret; | |
437d5aa5 | 3153 | alignment = type->alignment; |
ceabb767 MD |
3154 | if (alignment) { |
3155 | ret = lttng_metadata_printf(session, | |
3156 | "} align(%u)", | |
3157 | alignment); | |
3158 | } else { | |
3159 | ret = lttng_metadata_printf(session, | |
3160 | "}"); | |
3161 | } | |
f513b2bf MD |
3162 | return ret; |
3163 | } | |
3164 | ||
3165 | /* | |
3166 | * Must be called with sessions_mutex held. | |
3167 | */ | |
3168 | static | |
8cdc1a81 | 3169 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3170 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3171 | size_t nesting) |
3172 | { | |
3173 | int ret; | |
3174 | ||
3175 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3176 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3177 | if (ret) |
3178 | return ret; | |
ceabb767 | 3179 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3180 | } |
3181 | ||
65c85aa6 MD |
3182 | /* |
3183 | * Must be called with sessions_mutex held. | |
3184 | */ | |
3185 | static | |
8cdc1a81 | 3186 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3187 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3188 | size_t nesting, |
3189 | const char *prev_field_name) | |
65c85aa6 | 3190 | { |
51ef4536 | 3191 | const char *tag_name; |
65c85aa6 MD |
3192 | int ret; |
3193 | uint32_t i, nr_choices; | |
3194 | ||
51ef4536 MD |
3195 | tag_name = type->tag_name; |
3196 | if (!tag_name) | |
3197 | tag_name = prev_field_name; | |
3198 | if (!tag_name) | |
3199 | return -EINVAL; | |
ceabb767 MD |
3200 | /* |
3201 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3202 | */ | |
437d5aa5 | 3203 | if (type->alignment != 0) |
ceabb767 | 3204 | return -EINVAL; |
65c85aa6 MD |
3205 | ret = print_tabs(session, nesting); |
3206 | if (ret) | |
3207 | return ret; | |
3208 | ret = lttng_metadata_printf(session, | |
3209 | "variant <_%s> {\n", | |
51ef4536 | 3210 | tag_name); |
65c85aa6 MD |
3211 | if (ret) |
3212 | return ret; | |
437d5aa5 | 3213 | nr_choices = type->nr_choices; |
65c85aa6 | 3214 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3215 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3216 | |
437d5aa5 | 3217 | iter_field = type->choices[i]; |
51ef4536 | 3218 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3219 | if (ret) |
3220 | return ret; | |
3221 | } | |
3222 | ret = print_tabs(session, nesting); | |
3223 | if (ret) | |
3224 | return ret; | |
3225 | ret = lttng_metadata_printf(session, | |
3226 | "}"); | |
3227 | return ret; | |
3228 | } | |
3229 | ||
3230 | /* | |
3231 | * Must be called with sessions_mutex held. | |
3232 | */ | |
3233 | static | |
8cdc1a81 | 3234 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3235 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3236 | size_t nesting, |
3237 | const char *prev_field_name) | |
65c85aa6 MD |
3238 | { |
3239 | int ret; | |
3240 | ||
3241 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3242 | lttng_kernel_get_type_variant(field->type), nesting, |
3243 | prev_field_name); | |
65c85aa6 MD |
3244 | if (ret) |
3245 | return ret; | |
ceabb767 | 3246 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3247 | } |
3248 | ||
f513b2bf MD |
3249 | /* |
3250 | * Must be called with sessions_mutex held. | |
3251 | */ | |
3252 | static | |
8cdc1a81 | 3253 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3254 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3255 | size_t nesting) |
3256 | { | |
3257 | int ret; | |
437d5aa5 MD |
3258 | const struct lttng_kernel_type_array *array_type; |
3259 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3260 | |
437d5aa5 MD |
3261 | array_type = lttng_kernel_get_type_array(field->type); |
3262 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3263 | |
437d5aa5 | 3264 | if (array_type->alignment) { |
ceabb767 | 3265 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3266 | if (ret) |
3267 | return ret; | |
ceabb767 MD |
3268 | ret = lttng_metadata_printf(session, |
3269 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3270 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3271 | field->name); |
3272 | if (ret) | |
3273 | return ret; | |
3274 | } | |
3275 | /* | |
3276 | * Nested compound types: Only array of structures and variants are | |
3277 | * currently supported. | |
3278 | */ | |
437d5aa5 | 3279 | elem_type = array_type->elem_type; |
12bb2edb MD |
3280 | switch (elem_type->type) { |
3281 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3282 | case lttng_kernel_type_struct: |
3283 | case lttng_kernel_type_variant: | |
3284 | ret = _lttng_type_statedump(session, elem_type, | |
3285 | array_type->encoding, nesting); | |
65c85aa6 MD |
3286 | if (ret) |
3287 | return ret; | |
3288 | break; | |
ceabb767 | 3289 | |
f513b2bf MD |
3290 | default: |
3291 | return -EINVAL; | |
3292 | } | |
3293 | ret = lttng_metadata_printf(session, | |
3294 | " _%s[%u];\n", | |
3295 | field->name, | |
437d5aa5 | 3296 | array_type->length); |
f513b2bf MD |
3297 | return ret; |
3298 | } | |
3299 | ||
3300 | /* | |
3301 | * Must be called with sessions_mutex held. | |
3302 | */ | |
3303 | static | |
8cdc1a81 | 3304 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3305 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3306 | size_t nesting, |
3307 | const char *prev_field_name) | |
f513b2bf MD |
3308 | { |
3309 | int ret; | |
3310 | const char *length_name; | |
437d5aa5 MD |
3311 | const struct lttng_kernel_type_sequence *sequence_type; |
3312 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3313 | |
437d5aa5 MD |
3314 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3315 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3316 | |
437d5aa5 | 3317 | length_name = sequence_type->length_name; |
51ef4536 MD |
3318 | if (!length_name) |
3319 | length_name = prev_field_name; | |
3320 | if (!length_name) | |
3321 | return -EINVAL; | |
ceabb767 | 3322 | |
437d5aa5 | 3323 | if (sequence_type->alignment) { |
ceabb767 | 3324 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3325 | if (ret) |
3326 | return ret; | |
ceabb767 MD |
3327 | ret = lttng_metadata_printf(session, |
3328 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3329 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3330 | field->name); |
3331 | if (ret) | |
3332 | return ret; | |
3333 | } | |
3334 | ||
3335 | /* | |
3336 | * Nested compound types: Only array of structures and variants are | |
3337 | * currently supported. | |
3338 | */ | |
437d5aa5 | 3339 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3340 | switch (elem_type->type) { |
3341 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3342 | case lttng_kernel_type_struct: |
3343 | case lttng_kernel_type_variant: | |
3344 | ret = _lttng_type_statedump(session, elem_type, | |
3345 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3346 | if (ret) |
3347 | return ret; | |
3348 | break; | |
ceabb767 | 3349 | |
f513b2bf MD |
3350 | default: |
3351 | return -EINVAL; | |
3352 | } | |
3353 | ret = lttng_metadata_printf(session, | |
3354 | " _%s[ _%s ];\n", | |
3355 | field->name, | |
51ef4536 | 3356 | length_name); |
f513b2bf MD |
3357 | return ret; |
3358 | } | |
3359 | ||
141ddf28 MD |
3360 | /* |
3361 | * Must be called with sessions_mutex held. | |
3362 | */ | |
3363 | static | |
8cdc1a81 | 3364 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3365 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3366 | size_t nesting) |
3367 | { | |
d96a4a7a | 3368 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3369 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3370 | int ret; |
3371 | unsigned int i, nr_entries; | |
3372 | ||
437d5aa5 | 3373 | container_type = type->container_type; |
12bb2edb | 3374 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3375 | ret = -EINVAL; |
3376 | goto end; | |
3377 | } | |
437d5aa5 | 3378 | enum_desc = type->desc; |
141ddf28 MD |
3379 | nr_entries = enum_desc->nr_entries; |
3380 | ||
3381 | ret = print_tabs(session, nesting); | |
3382 | if (ret) | |
3383 | goto end; | |
ceabb767 MD |
3384 | ret = lttng_metadata_printf(session, "enum : "); |
3385 | if (ret) | |
3386 | goto end; | |
437d5aa5 MD |
3387 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3388 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3389 | if (ret) |
ceabb767 MD |
3390 | goto end; |
3391 | ret = lttng_metadata_printf(session, " {\n"); | |
3392 | if (ret) | |
3393 | goto end; | |
141ddf28 MD |
3394 | /* Dump all entries */ |
3395 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3396 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3397 | int j, len; |
3398 | ||
3399 | ret = print_tabs(session, nesting + 1); | |
3400 | if (ret) | |
3401 | goto end; | |
3402 | ret = lttng_metadata_printf(session, | |
3403 | "\""); | |
3404 | if (ret) | |
3405 | goto end; | |
3406 | len = strlen(entry->string); | |
3407 | /* Escape the character '"' */ | |
3408 | for (j = 0; j < len; j++) { | |
3409 | char c = entry->string[j]; | |
3410 | ||
3411 | switch (c) { | |
3412 | case '"': | |
3413 | ret = lttng_metadata_printf(session, | |
3414 | "\\\""); | |
3415 | break; | |
3416 | case '\\': | |
3417 | ret = lttng_metadata_printf(session, | |
3418 | "\\\\"); | |
3419 | break; | |
3420 | default: | |
3421 | ret = lttng_metadata_printf(session, | |
3422 | "%c", c); | |
3423 | break; | |
3424 | } | |
3425 | if (ret) | |
3426 | goto end; | |
3427 | } | |
08ad1061 PP |
3428 | ret = lttng_metadata_printf(session, "\""); |
3429 | if (ret) | |
3430 | goto end; | |
3431 | ||
3432 | if (entry->options.is_auto) { | |
3433 | ret = lttng_metadata_printf(session, ",\n"); | |
3434 | if (ret) | |
3435 | goto end; | |
141ddf28 | 3436 | } else { |
7c559490 MD |
3437 | ret = lttng_metadata_printf(session, |
3438 | " = "); | |
3439 | if (ret) | |
3440 | goto end; | |
3441 | if (entry->start.signedness) | |
141ddf28 | 3442 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3443 | "%lld", (long long) entry->start.value); |
3444 | else | |
3445 | ret = lttng_metadata_printf(session, | |
3446 | "%llu", entry->start.value); | |
3447 | if (ret) | |
3448 | goto end; | |
3449 | if (entry->start.signedness == entry->end.signedness && | |
3450 | entry->start.value | |
3451 | == entry->end.value) { | |
141ddf28 | 3452 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3453 | ",\n"); |
3454 | } else { | |
3455 | if (entry->end.signedness) { | |
3456 | ret = lttng_metadata_printf(session, | |
3457 | " ... %lld,\n", | |
3458 | (long long) entry->end.value); | |
3459 | } else { | |
3460 | ret = lttng_metadata_printf(session, | |
3461 | " ... %llu,\n", | |
3462 | entry->end.value); | |
3463 | } | |
141ddf28 | 3464 | } |
7c559490 MD |
3465 | if (ret) |
3466 | goto end; | |
141ddf28 | 3467 | } |
141ddf28 MD |
3468 | } |
3469 | ret = print_tabs(session, nesting); | |
3470 | if (ret) | |
3471 | goto end; | |
ceabb767 | 3472 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3473 | end: |
3474 | return ret; | |
3475 | } | |
3476 | ||
d83004aa JD |
3477 | /* |
3478 | * Must be called with sessions_mutex held. | |
3479 | */ | |
c099397a | 3480 | static |
8cdc1a81 | 3481 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3482 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3483 | size_t nesting) |
3484 | { | |
3485 | int ret; | |
437d5aa5 | 3486 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3487 | |
437d5aa5 MD |
3488 | enum_type = lttng_kernel_get_type_enum(field->type); |
3489 | WARN_ON_ONCE(!enum_type); | |
3490 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3491 | if (ret) |
3492 | return ret; | |
3493 | return lttng_field_name_statedump(session, field, nesting); | |
3494 | } | |
3495 | ||
3496 | static | |
8cdc1a81 | 3497 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3498 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3499 | size_t nesting) |
3500 | { | |
3501 | int ret; | |
3502 | ||
437d5aa5 MD |
3503 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3504 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3505 | if (ret) |
3506 | return ret; | |
3507 | return lttng_field_name_statedump(session, field, nesting); | |
3508 | } | |
3509 | ||
3510 | static | |
8cdc1a81 | 3511 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3512 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3513 | size_t nesting) |
3514 | { | |
3515 | int ret; | |
3516 | ||
ceabb767 MD |
3517 | /* Default encoding is UTF8 */ |
3518 | ret = print_tabs(session, nesting); | |
3519 | if (ret) | |
3520 | return ret; | |
3521 | ret = lttng_metadata_printf(session, | |
3522 | "string%s", | |
437d5aa5 | 3523 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3524 | " { encoding = ASCII; }" : ""); |
3525 | return ret; | |
3526 | } | |
3527 | ||
3528 | static | |
8cdc1a81 | 3529 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3530 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3531 | size_t nesting) |
ceabb767 | 3532 | { |
437d5aa5 | 3533 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3534 | int ret; |
3535 | ||
437d5aa5 MD |
3536 | string_type = lttng_kernel_get_type_string(field->type); |
3537 | WARN_ON_ONCE(!string_type); | |
3538 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3539 | if (ret) |
3540 | return ret; | |
3541 | return lttng_field_name_statedump(session, field, nesting); | |
3542 | } | |
3543 | ||
3544 | /* | |
3545 | * Must be called with sessions_mutex held. | |
3546 | */ | |
3547 | static | |
8cdc1a81 | 3548 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3549 | const struct lttng_kernel_type_common *type, |
3550 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3551 | size_t nesting) |
c099397a | 3552 | { |
c099397a | 3553 | int ret = 0; |
c099397a | 3554 | |
12bb2edb MD |
3555 | switch (type->type) { |
3556 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3557 | ret = _lttng_integer_type_statedump(session, |
3558 | lttng_kernel_get_type_integer(type), | |
3559 | parent_encoding, nesting); | |
8070f5c0 | 3560 | break; |
437d5aa5 MD |
3561 | case lttng_kernel_type_enum: |
3562 | ret = _lttng_enum_type_statedump(session, | |
3563 | lttng_kernel_get_type_enum(type), | |
3564 | nesting); | |
8070f5c0 | 3565 | break; |
12bb2edb | 3566 | case lttng_kernel_type_string: |
437d5aa5 MD |
3567 | ret = _lttng_string_type_statedump(session, |
3568 | lttng_kernel_get_type_string(type), | |
3569 | nesting); | |
ceabb767 | 3570 | break; |
437d5aa5 MD |
3571 | case lttng_kernel_type_struct: |
3572 | ret = _lttng_struct_type_statedump(session, | |
3573 | lttng_kernel_get_type_struct(type), | |
3574 | nesting); | |
8070f5c0 | 3575 | break; |
437d5aa5 MD |
3576 | case lttng_kernel_type_variant: |
3577 | ret = _lttng_variant_type_statedump(session, | |
3578 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3579 | nesting, NULL); |
ceabb767 MD |
3580 | break; |
3581 | ||
3582 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3583 | case lttng_kernel_type_array: |
3584 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3585 | default: |
3586 | WARN_ON_ONCE(1); | |
3587 | return -EINVAL; | |
8070f5c0 | 3588 | } |
ceabb767 MD |
3589 | return ret; |
3590 | } | |
8070f5c0 | 3591 | |
ceabb767 MD |
3592 | /* |
3593 | * Must be called with sessions_mutex held. | |
3594 | */ | |
3595 | static | |
8cdc1a81 | 3596 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3597 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3598 | size_t nesting, |
3599 | const char **prev_field_name_p) | |
ceabb767 | 3600 | { |
51ef4536 | 3601 | const char *prev_field_name = NULL; |
ceabb767 | 3602 | int ret = 0; |
27d2368e | 3603 | |
51ef4536 MD |
3604 | if (prev_field_name_p) |
3605 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3606 | switch (field->type->type) { |
12bb2edb | 3607 | case lttng_kernel_type_integer: |
ceabb767 MD |
3608 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3609 | break; | |
437d5aa5 | 3610 | case lttng_kernel_type_enum: |
ceabb767 | 3611 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3612 | break; |
12bb2edb | 3613 | case lttng_kernel_type_string: |
ceabb767 | 3614 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3615 | break; |
437d5aa5 | 3616 | case lttng_kernel_type_struct: |
ceabb767 | 3617 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3618 | break; |
437d5aa5 | 3619 | case lttng_kernel_type_array: |
ceabb767 | 3620 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3621 | break; |
437d5aa5 | 3622 | case lttng_kernel_type_sequence: |
51ef4536 | 3623 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3624 | break; |
437d5aa5 | 3625 | case lttng_kernel_type_variant: |
51ef4536 | 3626 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3627 | break; |
f513b2bf | 3628 | |
8070f5c0 MD |
3629 | default: |
3630 | WARN_ON_ONCE(1); | |
3631 | return -EINVAL; | |
3632 | } | |
51ef4536 MD |
3633 | if (prev_field_name_p) |
3634 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3635 | return ret; |
3636 | } | |
3637 | ||
3638 | static | |
8cdc1a81 | 3639 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3640 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3641 | { |
51ef4536 | 3642 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3643 | int ret = 0; |
3644 | int i; | |
3645 | ||
3646 | if (!ctx) | |
3647 | return 0; | |
3648 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3649 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3650 | |
51ef4536 | 3651 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3652 | if (ret) |
3653 | return ret; | |
3654 | } | |
3655 | return ret; | |
3656 | } | |
3657 | ||
3658 | static | |
8cdc1a81 | 3659 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3660 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3661 | { |
51ef4536 | 3662 | const char *prev_field_name = NULL; |
a67ba386 | 3663 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3664 | int ret = 0; |
3665 | int i; | |
3666 | ||
6c8c025b MD |
3667 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3668 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3669 | |
51ef4536 | 3670 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3671 | if (ret) |
3672 | return ret; | |
c099397a MD |
3673 | } |
3674 | return ret; | |
3675 | } | |
3676 | ||
d83004aa JD |
3677 | /* |
3678 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3679 | * The entire event metadata is printed as a single atomic metadata |
3680 | * transaction. | |
d83004aa | 3681 | */ |
c099397a | 3682 | static |
8cdc1a81 | 3683 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3684 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3685 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3686 | { |
3687 | int ret = 0; | |
3688 | ||
a67ba386 | 3689 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3690 | return 0; |
f7d06400 | 3691 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3692 | return 0; |
3693 | ||
8b97fd42 MD |
3694 | lttng_metadata_begin(session); |
3695 | ||
c099397a MD |
3696 | ret = lttng_metadata_printf(session, |
3697 | "event {\n" | |
ae734547 | 3698 | " name = \"%s\";\n" |
c099397a | 3699 | " id = %u;\n" |
b9074a1b | 3700 | " stream_id = %u;\n", |
a67ba386 MD |
3701 | event_recorder->priv->parent.desc->event_name, |
3702 | event_recorder->priv->id, | |
f7d06400 | 3703 | event_recorder->chan->priv->id); |
c099397a MD |
3704 | if (ret) |
3705 | goto end; | |
3706 | ||
8070f5c0 | 3707 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3708 | " fields := struct {\n" |
3709 | ); | |
3710 | if (ret) | |
3711 | goto end; | |
3712 | ||
a67ba386 | 3713 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3714 | if (ret) |
3715 | goto end; | |
3716 | ||
3717 | /* | |
3718 | * LTTng space reservation can only reserve multiples of the | |
3719 | * byte size. | |
3720 | */ | |
3721 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3722 | " };\n" |
3723 | "};\n\n"); | |
c099397a MD |
3724 | if (ret) |
3725 | goto end; | |
3726 | ||
a67ba386 | 3727 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3728 | end: |
8b97fd42 | 3729 | lttng_metadata_end(session); |
c099397a MD |
3730 | return ret; |
3731 | ||
3732 | } | |
3733 | ||
d83004aa JD |
3734 | /* |
3735 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3736 | * The entire channel metadata is printed as a single atomic metadata |
3737 | * transaction. | |
d83004aa | 3738 | */ |
c099397a | 3739 | static |
8cdc1a81 | 3740 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3741 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3742 | { |
3743 | int ret = 0; | |
3744 | ||
f7d06400 | 3745 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3746 | return 0; |
d83004aa | 3747 | |
f7d06400 | 3748 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3749 | return 0; |
3750 | ||
8b97fd42 MD |
3751 | lttng_metadata_begin(session); |
3752 | ||
f7d06400 | 3753 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3754 | ret = lttng_metadata_printf(session, |
3755 | "stream {\n" | |
3756 | " id = %u;\n" | |
9115fbdc | 3757 | " event.header := %s;\n" |
b9074a1b | 3758 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3759 | chan->priv->id, |
3760 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3761 | "struct event_header_large"); |
3762 | if (ret) | |
3763 | goto end; | |
3764 | ||
f7d06400 | 3765 | if (chan->priv->ctx) { |
b9074a1b MD |
3766 | ret = lttng_metadata_printf(session, |
3767 | " event.context := struct {\n"); | |
3768 | if (ret) | |
3769 | goto end; | |
3770 | } | |
f7d06400 | 3771 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3772 | if (ret) |
3773 | goto end; | |
f7d06400 | 3774 | if (chan->priv->ctx) { |
b9074a1b MD |
3775 | ret = lttng_metadata_printf(session, |
3776 | " };\n"); | |
3777 | if (ret) | |
3778 | goto end; | |
3779 | } | |
8070f5c0 MD |
3780 | |
3781 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3782 | "};\n\n"); |
8070f5c0 | 3783 | |
f7d06400 | 3784 | chan->priv->metadata_dumped = 1; |
c099397a | 3785 | end: |
8b97fd42 | 3786 | lttng_metadata_end(session); |
c099397a MD |
3787 | return ret; |
3788 | } | |
3789 | ||
d83004aa JD |
3790 | /* |
3791 | * Must be called with sessions_mutex held. | |
3792 | */ | |
9115fbdc | 3793 | static |
8cdc1a81 | 3794 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3795 | { |
3796 | return lttng_metadata_printf(session, | |
3797 | "struct packet_context {\n" | |
a3ccff4f MD |
3798 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3799 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3800 | " uint64_t content_size;\n" |
3801 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3802 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3803 | " unsigned long events_discarded;\n" |
9115fbdc | 3804 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3805 | "};\n\n" |
9115fbdc MD |
3806 | ); |
3807 | } | |
3808 | ||
3809 | /* | |
3810 | * Compact header: | |
3811 | * id: range: 0 - 30. | |
3812 | * id 31 is reserved to indicate an extended header. | |
3813 | * | |
3814 | * Large header: | |
3815 | * id: range: 0 - 65534. | |
3816 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3817 | * |
3818 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3819 | */ |
3820 | static | |
8cdc1a81 | 3821 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3822 | { |
3823 | return lttng_metadata_printf(session, | |
3824 | "struct event_header_compact {\n" | |
3825 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3826 | " variant <id> {\n" | |
3827 | " struct {\n" | |
a3ccff4f | 3828 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3829 | " } compact;\n" |
3830 | " struct {\n" | |
3831 | " uint32_t id;\n" | |
a3ccff4f | 3832 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3833 | " } extended;\n" |
3834 | " } v;\n" | |
3835 | "} align(%u);\n" | |
3836 | "\n" | |
3837 | "struct event_header_large {\n" | |
3838 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3839 | " variant <id> {\n" | |
3840 | " struct {\n" | |
a3ccff4f | 3841 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3842 | " } compact;\n" |
3843 | " struct {\n" | |
3844 | " uint32_t id;\n" | |
a3ccff4f | 3845 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3846 | " } extended;\n" |
3847 | " } v;\n" | |
3848 | "} align(%u);\n\n", | |
a90917c3 MD |
3849 | lttng_alignof(uint32_t) * CHAR_BIT, |
3850 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3851 | ); |
3852 | } | |
3853 | ||
a3ccff4f MD |
3854 | /* |
3855 | * Approximation of NTP time of day to clock monotonic correlation, | |
3856 | * taken at start of trace. | |
3857 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3858 | * in future versions. | |
5283350b MD |
3859 | * This function may return a negative offset. It may happen if the |
3860 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3861 | * |
3862 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3863 | * y2038 compliant. | |
a3ccff4f MD |
3864 | */ |
3865 | static | |
8967b2a3 | 3866 | int64_t measure_clock_offset(void) |
a3ccff4f | 3867 | { |
dcb93448 | 3868 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3869 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3870 | int64_t offset; |
a3ccff4f | 3871 | unsigned long flags; |
3636085f MJ |
3872 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3873 | struct timespec64 rts = { 0, 0 }; | |
3874 | #else | |
3875 | struct timespec rts = { 0, 0 }; | |
3876 | #endif | |
a3ccff4f MD |
3877 | |
3878 | /* Disable interrupts to increase correlation precision. */ | |
3879 | local_irq_save(flags); | |
3880 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3881 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3882 | ktime_get_real_ts64(&rts); | |
3883 | #else | |
216b6baa | 3884 | getnstimeofday(&rts); |
3636085f | 3885 | #endif |
a3ccff4f MD |
3886 | monotonic[1] = trace_clock_read64(); |
3887 | local_irq_restore(flags); | |
3888 | ||
dcb93448 | 3889 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3890 | realtime = (uint64_t) rts.tv_sec * tcf; |
3891 | if (tcf == NSEC_PER_SEC) { | |
3892 | realtime += rts.tv_nsec; | |
3893 | } else { | |
3894 | uint64_t n = rts.tv_nsec * tcf; | |
3895 | ||
3896 | do_div(n, NSEC_PER_SEC); | |
3897 | realtime += n; | |
3898 | } | |
dcb93448 | 3899 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3900 | return offset; |
3901 | } | |
3902 | ||
3eb95be4 | 3903 | static |
8cdc1a81 | 3904 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3905 | { |
0f3eaad4 | 3906 | int ret = 0; |
3eb95be4 JR |
3907 | size_t i; |
3908 | char cur; | |
3909 | ||
3910 | i = 0; | |
3911 | cur = string[i]; | |
3912 | while (cur != '\0') { | |
3913 | switch (cur) { | |
3914 | case '\n': | |
3915 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3916 | break; | |
3917 | case '\\': | |
3918 | case '"': | |
3919 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3920 | if (ret) | |
3921 | goto error; | |
3922 | /* We still print the current char */ | |
c190d76e | 3923 | lttng_fallthrough; |
3eb95be4 JR |
3924 | default: |
3925 | ret = lttng_metadata_printf(session, "%c", cur); | |
3926 | break; | |
3927 | } | |
3928 | ||
3929 | if (ret) | |
3930 | goto error; | |
3931 | ||
3932 | cur = string[++i]; | |
3933 | } | |
3934 | error: | |
3935 | return ret; | |
3936 | } | |
3937 | ||
3938 | static | |
8cdc1a81 | 3939 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3940 | const char *field_value) |
3eb95be4 JR |
3941 | { |
3942 | int ret; | |
3943 | ||
1c88f269 | 3944 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3945 | if (ret) |
3946 | goto error; | |
3947 | ||
1c88f269 | 3948 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3949 | if (ret) |
3950 | goto error; | |
3951 | ||
3952 | ret = lttng_metadata_printf(session, "\";\n"); | |
3953 | ||
3954 | error: | |
3955 | return ret; | |
3956 | } | |
3957 | ||
c099397a MD |
3958 | /* |
3959 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3960 | * Must be called with sessions_mutex held. |
c099397a MD |
3961 | */ |
3962 | static | |
8cdc1a81 | 3963 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3964 | { |
8cdc1a81 | 3965 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3966 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3967 | const char *product_uuid; |
f7d06400 | 3968 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3969 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3970 | int ret = 0; |
3971 | ||
585e5dcc | 3972 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3973 | return 0; |
8b97fd42 MD |
3974 | |
3975 | lttng_metadata_begin(session); | |
3976 | ||
8cdc1a81 | 3977 | if (session->priv->metadata_dumped) |
c099397a | 3978 | goto skip_session; |
c099397a | 3979 | |
d793d5e1 | 3980 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3981 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3982 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3983 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3984 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3985 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3986 | |
3987 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3988 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3989 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3990 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3991 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3992 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3993 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3994 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3995 | "\n" |
3996 | "trace {\n" | |
3997 | " major = %u;\n" | |
3998 | " minor = %u;\n" | |
30bdb6e4 | 3999 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4000 | " byte_order = %s;\n" |
4001 | " packet.header := struct {\n" | |
4002 | " uint32_t magic;\n" | |
1ec3f75a | 4003 | " uint8_t uuid[16];\n" |
d793d5e1 | 4004 | " uint32_t stream_id;\n" |
5594698f | 4005 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4006 | " };\n" |
d793d5e1 | 4007 | "};\n\n", |
a90917c3 MD |
4008 | lttng_alignof(uint8_t) * CHAR_BIT, |
4009 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4010 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4011 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4012 | sizeof(unsigned long) * CHAR_BIT, |
4013 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4014 | CTF_SPEC_MAJOR, |
4015 | CTF_SPEC_MINOR, | |
d793d5e1 | 4016 | uuid_s, |
5214fa50 | 4017 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4018 | "be" |
4019 | #else | |
4020 | "le" | |
4021 | #endif | |
4022 | ); | |
4023 | if (ret) | |
4024 | goto end; | |
4025 | ||
99dc9597 MD |
4026 | ret = lttng_metadata_printf(session, |
4027 | "env {\n" | |
a6058143 | 4028 | " hostname = \"%s\";\n" |
c6c9e10f | 4029 | " domain = \"kernel\";\n" |
99dc9597 | 4030 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4031 | " kernel_release = \"%s\";\n" |
4032 | " kernel_version = \"%s\";\n" | |
4033 | " tracer_name = \"lttng-modules\";\n" | |
4034 | " tracer_major = %d;\n" | |
4035 | " tracer_minor = %d;\n" | |
4036 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4037 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4038 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4039 | utsname()->sysname, |
4040 | utsname()->release, | |
c6c9e10f MD |
4041 | utsname()->version, |
4042 | LTTNG_MODULES_MAJOR_VERSION, | |
4043 | LTTNG_MODULES_MINOR_VERSION, | |
4044 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4045 | ); |
4046 | if (ret) | |
4047 | goto end; | |
4048 | ||
8cdc1a81 | 4049 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4050 | if (ret) |
4051 | goto end; | |
4052 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4053 | session->priv->creation_time); |
3eb95be4 JR |
4054 | if (ret) |
4055 | goto end; | |
4056 | ||
c88f762e GB |
4057 | /* Add the product UUID to the 'env' section */ |
4058 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4059 | if (product_uuid) { | |
4060 | ret = lttng_metadata_printf(session, | |
4061 | " product_uuid = \"%s\";\n", | |
4062 | product_uuid | |
4063 | ); | |
4064 | if (ret) | |
4065 | goto end; | |
4066 | } | |
4067 | ||
4068 | /* Close the 'env' section */ | |
3eb95be4 JR |
4069 | ret = lttng_metadata_printf(session, "};\n\n"); |
4070 | if (ret) | |
4071 | goto end; | |
4072 | ||
a3ccff4f MD |
4073 | ret = lttng_metadata_printf(session, |
4074 | "clock {\n" | |
2754583e MD |
4075 | " name = \"%s\";\n", |
4076 | trace_clock_name() | |
a82c63f1 MD |
4077 | ); |
4078 | if (ret) | |
4079 | goto end; | |
4080 | ||
4081 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4082 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4083 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4084 | clock_uuid_s |
4085 | ); | |
4086 | if (ret) | |
4087 | goto end; | |
4088 | } | |
4089 | ||
4090 | ret = lttng_metadata_printf(session, | |
2754583e | 4091 | " description = \"%s\";\n" |
a3ccff4f MD |
4092 | " freq = %llu; /* Frequency, in Hz */\n" |
4093 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4094 | " offset = %lld;\n" |
a3ccff4f | 4095 | "};\n\n", |
2754583e | 4096 | trace_clock_description(), |
a3ccff4f | 4097 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4098 | (long long) measure_clock_offset() |
a3ccff4f MD |
4099 | ); |
4100 | if (ret) | |
4101 | goto end; | |
4102 | ||
4103 | ret = lttng_metadata_printf(session, | |
4104 | "typealias integer {\n" | |
4105 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4106 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4107 | "} := uint27_clock_monotonic_t;\n" |
4108 | "\n" | |
4109 | "typealias integer {\n" | |
4110 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4111 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4112 | "} := uint32_clock_monotonic_t;\n" |
4113 | "\n" | |
4114 | "typealias integer {\n" | |
4115 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4116 | " map = clock.%s.value;\n" |
a3ccff4f | 4117 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4118 | trace_clock_name(), |
a3ccff4f | 4119 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4120 | trace_clock_name(), |
4121 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4122 | trace_clock_name() | |
a3ccff4f MD |
4123 | ); |
4124 | if (ret) | |
4125 | goto end; | |
4126 | ||
a90917c3 | 4127 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4128 | if (ret) |
4129 | goto end; | |
4130 | ||
a90917c3 | 4131 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4132 | if (ret) |
4133 | goto end; | |
4134 | ||
c099397a | 4135 | skip_session: |
f7d06400 MD |
4136 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4137 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4138 | if (ret) |
4139 | goto end; | |
4140 | } | |
4141 | ||
8cdc1a81 | 4142 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4143 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4144 | event_recorder_priv->pub); | |
c099397a MD |
4145 | if (ret) |
4146 | goto end; | |
4147 | } | |
8cdc1a81 | 4148 | session->priv->metadata_dumped = 1; |
c099397a | 4149 | end: |
8b97fd42 | 4150 | lttng_metadata_end(session); |
c099397a MD |
4151 | return ret; |
4152 | } | |
4153 | ||
c0e31d2e | 4154 | /** |
a90917c3 | 4155 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4156 | * @transport: transport structure |
4157 | * | |
4158 | * Registers a transport which can be used as output to extract the data out of | |
4159 | * LTTng. The module calling this registration function must ensure that no | |
4160 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4161 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4162 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4163 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4164 | * after its registration must it synchronize the TLBs. |
4165 | */ | |
a90917c3 | 4166 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4167 | { |
4168 | /* | |
4169 | * Make sure no page fault can be triggered by the module about to be | |
4170 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4171 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4172 | */ |
263b6c88 | 4173 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4174 | |
4175 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4176 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4177 | mutex_unlock(&sessions_mutex); |
4178 | } | |
a90917c3 | 4179 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4180 | |
4181 | /** | |
a90917c3 | 4182 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4183 | * @transport: transport structure |
4184 | */ | |
a90917c3 | 4185 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4186 | { |
4187 | mutex_lock(&sessions_mutex); | |
4188 | list_del(&transport->node); | |
4189 | mutex_unlock(&sessions_mutex); | |
4190 | } | |
a90917c3 | 4191 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4192 | |
a101fa10 MD |
4193 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4194 | { | |
4195 | /* | |
4196 | * Make sure no page fault can be triggered by the module about to be | |
4197 | * registered. We deal with this here so we don't have to call | |
4198 | * vmalloc_sync_mappings() in each module's init. | |
4199 | */ | |
4200 | wrapper_vmalloc_sync_mappings(); | |
4201 | ||
4202 | mutex_lock(&sessions_mutex); | |
4203 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4204 | mutex_unlock(&sessions_mutex); | |
4205 | } | |
4206 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4207 | ||
4208 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4209 | { | |
4210 | mutex_lock(&sessions_mutex); | |
4211 | list_del(&transport->node); | |
4212 | mutex_unlock(&sessions_mutex); | |
4213 | } | |
4214 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4215 | ||
5f4c791e | 4216 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4217 | |
4218 | enum cpuhp_state lttng_hp_prepare; | |
4219 | enum cpuhp_state lttng_hp_online; | |
4220 | ||
4221 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4222 | { | |
4223 | struct lttng_cpuhp_node *lttng_node; | |
4224 | ||
4225 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4226 | switch (lttng_node->component) { | |
4227 | case LTTNG_RING_BUFFER_FRONTEND: | |
4228 | return 0; | |
4229 | case LTTNG_RING_BUFFER_BACKEND: | |
4230 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4231 | case LTTNG_RING_BUFFER_ITER: | |
4232 | return 0; | |
4233 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4234 | return 0; | |
4235 | default: | |
4236 | return -EINVAL; | |
4237 | } | |
4238 | } | |
4239 | ||
4240 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4241 | { | |
4242 | struct lttng_cpuhp_node *lttng_node; | |
4243 | ||
4244 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4245 | switch (lttng_node->component) { | |
4246 | case LTTNG_RING_BUFFER_FRONTEND: | |
4247 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4248 | case LTTNG_RING_BUFFER_BACKEND: | |
4249 | return 0; | |
4250 | case LTTNG_RING_BUFFER_ITER: | |
4251 | return 0; | |
4252 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4253 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4254 | default: | |
4255 | return -EINVAL; | |
4256 | } | |
4257 | } | |
4258 | ||
4259 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4260 | { | |
4261 | struct lttng_cpuhp_node *lttng_node; | |
4262 | ||
4263 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4264 | switch (lttng_node->component) { | |
4265 | case LTTNG_RING_BUFFER_FRONTEND: | |
4266 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4267 | case LTTNG_RING_BUFFER_BACKEND: | |
4268 | return 0; | |
4269 | case LTTNG_RING_BUFFER_ITER: | |
4270 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4271 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4272 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4273 | default: | |
4274 | return -EINVAL; | |
4275 | } | |
4276 | } | |
4277 | ||
4278 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4279 | { | |
4280 | struct lttng_cpuhp_node *lttng_node; | |
4281 | ||
4282 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4283 | switch (lttng_node->component) { | |
4284 | case LTTNG_RING_BUFFER_FRONTEND: | |
4285 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4286 | case LTTNG_RING_BUFFER_BACKEND: | |
4287 | return 0; | |
4288 | case LTTNG_RING_BUFFER_ITER: | |
4289 | return 0; | |
4290 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4291 | return 0; | |
4292 | default: | |
4293 | return -EINVAL; | |
4294 | } | |
4295 | } | |
4296 | ||
4297 | static int __init lttng_init_cpu_hotplug(void) | |
4298 | { | |
4299 | int ret; | |
4300 | ||
4301 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4302 | lttng_hotplug_prepare, | |
4303 | lttng_hotplug_dead); | |
4304 | if (ret < 0) { | |
4305 | return ret; | |
4306 | } | |
4307 | lttng_hp_prepare = ret; | |
4308 | lttng_rb_set_hp_prepare(ret); | |
4309 | ||
4310 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4311 | lttng_hotplug_online, | |
4312 | lttng_hotplug_offline); | |
4313 | if (ret < 0) { | |
4314 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4315 | lttng_hp_prepare = 0; | |
4316 | return ret; | |
4317 | } | |
4318 | lttng_hp_online = ret; | |
4319 | lttng_rb_set_hp_online(ret); | |
4320 | ||
4321 | return 0; | |
4322 | } | |
4323 | ||
4324 | static void __exit lttng_exit_cpu_hotplug(void) | |
4325 | { | |
4326 | lttng_rb_set_hp_online(0); | |
4327 | cpuhp_remove_multi_state(lttng_hp_online); | |
4328 | lttng_rb_set_hp_prepare(0); | |
4329 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4330 | } | |
4331 | ||
5f4c791e | 4332 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4333 | static int lttng_init_cpu_hotplug(void) |
4334 | { | |
4335 | return 0; | |
4336 | } | |
4337 | static void lttng_exit_cpu_hotplug(void) | |
4338 | { | |
4339 | } | |
5f4c791e | 4340 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4341 | |
a90917c3 | 4342 | static int __init lttng_events_init(void) |
4e3c1b9b | 4343 | { |
1c25284c MD |
4344 | int ret; |
4345 | ||
453b2495 JD |
4346 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4347 | if (ret) | |
4348 | return ret; | |
389d7070 | 4349 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4350 | if (ret) |
4351 | return ret; | |
4352 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4353 | if (ret) |
4354 | return ret; | |
4355 | ret = lttng_probes_init(); | |
389d7070 MD |
4356 | if (ret) |
4357 | return ret; | |
07dfc1d0 | 4358 | ret = lttng_context_init(); |
20591cf7 MD |
4359 | if (ret) |
4360 | return ret; | |
07dfc1d0 MD |
4361 | ret = lttng_tracepoint_init(); |
4362 | if (ret) | |
4363 | goto error_tp; | |
a67ba386 MD |
4364 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4365 | if (!event_recorder_cache) { | |
20591cf7 | 4366 | ret = -ENOMEM; |
a67ba386 | 4367 | goto error_kmem_event_recorder; |
dffef45d | 4368 | } |
a67ba386 MD |
4369 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4370 | if (!event_recorder_private_cache) { | |
4371 | ret = -ENOMEM; | |
4372 | goto error_kmem_event_recorder_private; | |
4373 | } | |
4374 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4375 | if (!event_notifier_cache) { |
4376 | ret = -ENOMEM; | |
4377 | goto error_kmem_event_notifier; | |
20591cf7 | 4378 | } |
a67ba386 MD |
4379 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4380 | if (!event_notifier_private_cache) { | |
4381 | ret = -ENOMEM; | |
4382 | goto error_kmem_event_notifier_private; | |
4383 | } | |
80996790 | 4384 | ret = lttng_abi_init(); |
02119ee5 MD |
4385 | if (ret) |
4386 | goto error_abi; | |
0c956676 MD |
4387 | ret = lttng_logger_init(); |
4388 | if (ret) | |
4389 | goto error_logger; | |
1e367326 MD |
4390 | ret = lttng_init_cpu_hotplug(); |
4391 | if (ret) | |
4392 | goto error_hotplug; | |
101215b7 | 4393 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4394 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4395 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4396 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4397 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4398 | LTTNG_VERSION_NAME, |
4399 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4400 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4401 | #else | |
4402 | "", | |
4403 | #endif | |
4404 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4405 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4406 | #else | |
4407 | ""); | |
4408 | #endif | |
c1551e57 MJ |
4409 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4410 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4411 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4412 | return 0; |
0c956676 | 4413 | |
1e367326 MD |
4414 | error_hotplug: |
4415 | lttng_logger_exit(); | |
0c956676 MD |
4416 | error_logger: |
4417 | lttng_abi_exit(); | |
02119ee5 | 4418 | error_abi: |
a67ba386 MD |
4419 | kmem_cache_destroy(event_notifier_private_cache); |
4420 | error_kmem_event_notifier_private: | |
dffef45d FD |
4421 | kmem_cache_destroy(event_notifier_cache); |
4422 | error_kmem_event_notifier: | |
a67ba386 MD |
4423 | kmem_cache_destroy(event_recorder_private_cache); |
4424 | error_kmem_event_recorder_private: | |
4425 | kmem_cache_destroy(event_recorder_cache); | |
4426 | error_kmem_event_recorder: | |
20591cf7 | 4427 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4428 | error_tp: |
4429 | lttng_context_exit(); | |
101215b7 | 4430 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4431 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4432 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4433 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4434 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4435 | LTTNG_VERSION_NAME, |
4436 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4437 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4438 | #else | |
4439 | "", | |
4440 | #endif | |
4441 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4442 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4443 | #else | |
4444 | ""); | |
4445 | #endif | |
1c25284c | 4446 | return ret; |
4e3c1b9b MD |
4447 | } |
4448 | ||
a90917c3 | 4449 | module_init(lttng_events_init); |
11b5a3c2 | 4450 | |
a90917c3 | 4451 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4452 | { |
8cdc1a81 | 4453 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4454 | |
1e367326 | 4455 | lttng_exit_cpu_hotplug(); |
0c956676 | 4456 | lttng_logger_exit(); |
80996790 | 4457 | lttng_abi_exit(); |
8cdc1a81 MD |
4458 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4459 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4460 | kmem_cache_destroy(event_recorder_cache); |
4461 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4462 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4463 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4464 | lttng_tracepoint_exit(); |
07dfc1d0 | 4465 | lttng_context_exit(); |
101215b7 | 4466 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4467 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4468 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4469 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4470 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4471 | LTTNG_VERSION_NAME, |
4472 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4473 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4474 | #else | |
4475 | "", | |
4476 | #endif | |
4477 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4478 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4479 | #else | |
4480 | ""); | |
4481 | #endif | |
4e3c1b9b | 4482 | } |
92e94819 | 4483 | |
a90917c3 | 4484 | module_exit(lttng_events_exit); |
11b5a3c2 | 4485 | |
7ca11e77 | 4486 | #include <generated/patches.h> |
101215b7 MJ |
4487 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4488 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4489 | #endif | |
4490 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4491 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4492 | #endif | |
92e94819 MD |
4493 | MODULE_LICENSE("GPL and additional rights"); |
4494 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4495 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4496 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4497 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4498 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4499 | LTTNG_MODULES_EXTRAVERSION); |