Commit | Line | Data |
---|---|---|
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> | |
8c6e7f13 | 26 | #include <linux/uaccess.h> |
a606b6e8 | 27 | #include <linux/vmalloc.h> |
c88f762e | 28 | #include <linux/dmi.h> |
3c997079 | 29 | |
c190d76e | 30 | #include <wrapper/compiler_attributes.h> |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
92bc1e23 | 39 | #include <lttng/events-internal.h> |
0b365677 | 40 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 41 | #include <lttng/tracer.h> |
21f58fb7 | 42 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
43 | #include <lttng/abi-old.h> |
44 | #include <lttng/endian.h> | |
45 | #include <lttng/string-utils.h> | |
4a11ef1c | 46 | #include <lttng/utils.h> |
24591303 MD |
47 | #include <ringbuffer/backend.h> |
48 | #include <ringbuffer/frontend.h> | |
3636085f | 49 | #include <wrapper/time.h> |
4e3c1b9b | 50 | |
5987e66c MJ |
51 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) |
52 | #include <linux/stdarg.h> | |
53 | #else | |
54 | #include <stdarg.h> | |
55 | #endif | |
56 | ||
d83004aa JD |
57 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
58 | ||
4e3c1b9b | 59 | static LIST_HEAD(sessions); |
750b05f2 | 60 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 62 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
63 | /* |
64 | * Protect the sessions and metadata caches. | |
65 | */ | |
4e3c1b9b | 66 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
67 | static struct kmem_cache *event_recorder_cache; |
68 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 69 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 70 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 71 | |
8cdc1a81 MD |
72 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
73 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 74 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 75 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 76 | |
0648898e | 77 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 78 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
6a338ba4 | 79 | static void _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 80 | static |
ee7e9a18 | 81 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 82 | static |
8cdc1a81 | 83 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
84 | static |
85 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 86 | static |
8cdc1a81 | 87 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
88 | const struct lttng_kernel_type_common *type, |
89 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
90 | size_t nesting); |
91 | static | |
8cdc1a81 | 92 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 93 | const struct lttng_kernel_event_field *field, |
51ef4536 | 94 | size_t nesting, const char **prev_field_name_p); |
c099397a | 95 | |
c099397a | 96 | void synchronize_trace(void) |
abcca994 | 97 | { |
05355f0b MJ |
98 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
99 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
100 | synchronize_rcu(); |
101 | #else | |
abcca994 | 102 | synchronize_sched(); |
92da05ce MJ |
103 | #endif |
104 | ||
5f4c791e | 105 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
106 | #ifdef CONFIG_PREEMPT_RT_FULL |
107 | synchronize_rcu(); | |
108 | #endif | |
5f4c791e | 109 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
110 | #ifdef CONFIG_PREEMPT_RT |
111 | synchronize_rcu(); | |
112 | #endif | |
5f4c791e | 113 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
114 | } |
115 | ||
3c997079 MD |
116 | void lttng_lock_sessions(void) |
117 | { | |
118 | mutex_lock(&sessions_mutex); | |
119 | } | |
120 | ||
121 | void lttng_unlock_sessions(void) | |
122 | { | |
123 | mutex_unlock(&sessions_mutex); | |
124 | } | |
125 | ||
9fe593d2 FD |
126 | static struct lttng_transport *lttng_transport_find(const char *name) |
127 | { | |
128 | struct lttng_transport *transport; | |
129 | ||
130 | list_for_each_entry(transport, <tng_transport_list, node) { | |
131 | if (!strcmp(transport->name, name)) | |
132 | return transport; | |
133 | } | |
134 | return NULL; | |
135 | } | |
136 | ||
3c997079 MD |
137 | /* |
138 | * Called with sessions lock held. | |
139 | */ | |
140 | int lttng_session_active(void) | |
141 | { | |
8cdc1a81 | 142 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
143 | |
144 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 145 | if (iter->pub->active) |
3c997079 MD |
146 | return 1; |
147 | } | |
148 | return 0; | |
149 | } | |
150 | ||
8cdc1a81 | 151 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 152 | { |
8cdc1a81 MD |
153 | struct lttng_kernel_session *session; |
154 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 155 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 156 | int i; |
4e3c1b9b MD |
157 | |
158 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 159 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 160 | if (!session) |
d83004aa | 161 | goto err; |
8cdc1a81 MD |
162 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
163 | if (!session_priv) | |
164 | goto err_free_session; | |
165 | session->priv = session_priv; | |
166 | session_priv->pub = session; | |
167 | ||
168 | INIT_LIST_HEAD(&session_priv->chan); | |
169 | INIT_LIST_HEAD(&session_priv->events); | |
170 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
171 | |
172 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
173 | GFP_KERNEL); | |
174 | if (!metadata_cache) | |
8cdc1a81 | 175 | goto err_free_session_private; |
0ca42eb7 | 176 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
177 | if (!metadata_cache->data) |
178 | goto err_free_cache; | |
179 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
180 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 181 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 182 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 183 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 184 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 185 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 186 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 187 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
188 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
189 | list_add(&session_priv->list, &sessions); | |
190 | ||
8c0393c3 MD |
191 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
192 | goto tracker_alloc_error; | |
193 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
194 | goto tracker_alloc_error; | |
195 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
196 | goto tracker_alloc_error; | |
197 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
198 | goto tracker_alloc_error; | |
199 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
200 | goto tracker_alloc_error; | |
201 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
202 | goto tracker_alloc_error; | |
203 | ||
4e3c1b9b | 204 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 205 | |
4e3c1b9b | 206 | return session; |
d83004aa | 207 | |
8c0393c3 MD |
208 | tracker_alloc_error: |
209 | lttng_id_tracker_fini(&session->pid_tracker); | |
210 | lttng_id_tracker_fini(&session->vpid_tracker); | |
211 | lttng_id_tracker_fini(&session->uid_tracker); | |
212 | lttng_id_tracker_fini(&session->vuid_tracker); | |
213 | lttng_id_tracker_fini(&session->gid_tracker); | |
214 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
215 | err_free_cache: |
216 | kfree(metadata_cache); | |
8cdc1a81 MD |
217 | err_free_session_private: |
218 | lttng_kvfree(session_priv); | |
d83004aa | 219 | err_free_session: |
48f5e0b5 | 220 | lttng_kvfree(session); |
d83004aa JD |
221 | err: |
222 | mutex_unlock(&sessions_mutex); | |
223 | return NULL; | |
224 | } | |
225 | ||
99f52fcc FD |
226 | static |
227 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
228 | { | |
229 | struct lttng_counter_transport *transport; | |
230 | ||
231 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
232 | if (!strcmp(transport->name, name)) | |
233 | return transport; | |
234 | } | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | struct lttng_counter *lttng_kernel_counter_create( | |
239 | const char *counter_transport_name, | |
240 | size_t number_dimensions, const size_t *dimensions_sizes) | |
241 | { | |
242 | struct lttng_counter *counter = NULL; | |
243 | struct lttng_counter_transport *counter_transport = NULL; | |
244 | ||
245 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
246 | if (!counter_transport) { | |
247 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
248 | counter_transport_name); | |
249 | goto notransport; | |
250 | } | |
251 | if (!try_module_get(counter_transport->owner)) { | |
252 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
253 | goto notransport; | |
254 | } | |
255 | ||
256 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
257 | if (!counter) | |
258 | goto nomem; | |
259 | ||
260 | /* Create event notifier error counter. */ | |
261 | counter->ops = &counter_transport->ops; | |
262 | counter->transport = counter_transport; | |
263 | ||
264 | counter->counter = counter->ops->counter_create( | |
265 | number_dimensions, dimensions_sizes, 0); | |
266 | if (!counter->counter) { | |
267 | goto create_error; | |
268 | } | |
269 | ||
270 | return counter; | |
271 | ||
272 | create_error: | |
273 | lttng_kvfree(counter); | |
274 | nomem: | |
275 | if (counter_transport) | |
276 | module_put(counter_transport->owner); | |
277 | notransport: | |
278 | return NULL; | |
279 | } | |
280 | ||
750b05f2 FD |
281 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
282 | { | |
283 | struct lttng_transport *transport = NULL; | |
284 | struct lttng_event_notifier_group *event_notifier_group; | |
285 | const char *transport_name = "relay-event-notifier"; | |
286 | size_t subbuf_size = 4096; //TODO | |
287 | size_t num_subbuf = 16; //TODO | |
288 | unsigned int switch_timer_interval = 0; | |
289 | unsigned int read_timer_interval = 0; | |
dffef45d | 290 | int i; |
750b05f2 FD |
291 | |
292 | mutex_lock(&sessions_mutex); | |
293 | ||
294 | transport = lttng_transport_find(transport_name); | |
295 | if (!transport) { | |
296 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
297 | transport_name); | |
298 | goto notransport; | |
299 | } | |
300 | if (!try_module_get(transport->owner)) { | |
301 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
302 | transport_name); | |
303 | goto notransport; | |
304 | } | |
305 | ||
306 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
307 | GFP_KERNEL); | |
308 | if (!event_notifier_group) | |
309 | goto nomem; | |
310 | ||
311 | /* | |
312 | * Initialize the ring buffer used to store event notifier | |
313 | * notifications. | |
314 | */ | |
315 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 316 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
317 | transport_name, event_notifier_group, NULL, |
318 | subbuf_size, num_subbuf, switch_timer_interval, | |
319 | read_timer_interval); | |
320 | if (!event_notifier_group->chan) | |
321 | goto create_error; | |
322 | ||
323 | event_notifier_group->transport = transport; | |
dffef45d FD |
324 | |
325 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
326 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
327 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
328 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 329 | |
750b05f2 FD |
330 | list_add(&event_notifier_group->node, &event_notifier_groups); |
331 | ||
332 | mutex_unlock(&sessions_mutex); | |
333 | ||
334 | return event_notifier_group; | |
335 | ||
336 | create_error: | |
337 | lttng_kvfree(event_notifier_group); | |
338 | nomem: | |
339 | if (transport) | |
340 | module_put(transport->owner); | |
341 | notransport: | |
342 | mutex_unlock(&sessions_mutex); | |
343 | return NULL; | |
344 | } | |
345 | ||
d83004aa JD |
346 | void metadata_cache_destroy(struct kref *kref) |
347 | { | |
348 | struct lttng_metadata_cache *cache = | |
349 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 350 | vfree(cache->data); |
d83004aa | 351 | kfree(cache); |
4e3c1b9b MD |
352 | } |
353 | ||
8cdc1a81 | 354 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 355 | { |
f7d06400 | 356 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 357 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 358 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 359 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 360 | int ret; |
4e3c1b9b MD |
361 | |
362 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 363 | WRITE_ONCE(session->active, 0); |
f7d06400 | 364 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 365 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
366 | WARN_ON(ret); |
367 | } | |
6a338ba4 MD |
368 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) |
369 | _lttng_event_unregister(&event_recorder_priv->pub->parent); | |
abcca994 | 370 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 371 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 372 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
373 | WARN_ON(ret); |
374 | } | |
09710b83 MD |
375 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
376 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 377 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 378 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
379 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
380 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
381 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 382 | } |
8cdc1a81 MD |
383 | mutex_lock(&session->priv->metadata_cache->lock); |
384 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 385 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 386 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
387 | lttng_id_tracker_fini(&session->pid_tracker); |
388 | lttng_id_tracker_fini(&session->vpid_tracker); | |
389 | lttng_id_tracker_fini(&session->uid_tracker); | |
390 | lttng_id_tracker_fini(&session->vuid_tracker); | |
391 | lttng_id_tracker_fini(&session->gid_tracker); | |
392 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
393 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
394 | list_del(&session->priv->list); | |
4e3c1b9b | 395 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 396 | lttng_kvfree(session->priv); |
48f5e0b5 | 397 | lttng_kvfree(session); |
4e3c1b9b MD |
398 | } |
399 | ||
dffef45d FD |
400 | void lttng_event_notifier_group_destroy( |
401 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 402 | { |
09710b83 | 403 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 404 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
405 | int ret; |
406 | ||
750b05f2 FD |
407 | if (!event_notifier_group) |
408 | return; | |
409 | ||
410 | mutex_lock(&sessions_mutex); | |
dffef45d | 411 | |
6053e75e | 412 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
413 | WARN_ON(ret); |
414 | ||
a67ba386 | 415 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
6a338ba4 MD |
416 | &event_notifier_group->event_notifiers_head, parent.node) |
417 | _lttng_event_unregister(&event_notifier_priv->pub->parent); | |
dffef45d | 418 | |
b01155ba FD |
419 | /* Wait for in-flight event notifier to complete */ |
420 | synchronize_trace(); | |
421 | ||
21f58fb7 FD |
422 | irq_work_sync(&event_notifier_group->wakeup_pending); |
423 | ||
6053e75e MD |
424 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
425 | WARN_ON(ret); | |
8a8ac9a8 | 426 | |
09710b83 | 427 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 428 | &event_notifier_group->enablers_head, node) |
09710b83 | 429 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 430 | |
a67ba386 | 431 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 432 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 433 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 434 | |
99f52fcc FD |
435 | if (event_notifier_group->error_counter) { |
436 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 437 | |
99f52fcc FD |
438 | error_counter->ops->counter_destroy(error_counter->counter); |
439 | module_put(error_counter->transport->owner); | |
440 | lttng_kvfree(error_counter); | |
441 | event_notifier_group->error_counter = NULL; | |
442 | } | |
443 | ||
4a399b76 | 444 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
445 | module_put(event_notifier_group->transport->owner); |
446 | list_del(&event_notifier_group->node); | |
dffef45d | 447 | |
750b05f2 FD |
448 | mutex_unlock(&sessions_mutex); |
449 | lttng_kvfree(event_notifier_group); | |
450 | } | |
451 | ||
8cdc1a81 | 452 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
453 | { |
454 | int ret; | |
455 | ||
456 | mutex_lock(&sessions_mutex); | |
457 | ret = lttng_statedump_start(session); | |
458 | mutex_unlock(&sessions_mutex); | |
459 | return ret; | |
460 | } | |
461 | ||
8cdc1a81 | 462 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
463 | { |
464 | int ret = 0; | |
f7d06400 | 465 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
466 | |
467 | mutex_lock(&sessions_mutex); | |
468 | if (session->active) { | |
469 | ret = -EBUSY; | |
470 | goto end; | |
471 | } | |
c099397a | 472 | |
3c997079 | 473 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 474 | session->priv->tstate = 1; |
3c997079 | 475 | |
4ef81e4a | 476 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 477 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 478 | |
c099397a MD |
479 | /* |
480 | * Snapshot the number of events per channel to know the type of header | |
481 | * we need to use. | |
482 | */ | |
f7d06400 MD |
483 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
484 | if (chan_priv->header_type) | |
485 | continue; /* don't change it if session stop/restart */ | |
486 | if (chan_priv->free_event_id < 31) | |
487 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 488 | else |
f7d06400 | 489 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
490 | } |
491 | ||
64af2437 | 492 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
493 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
494 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
495 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 496 | } |
64af2437 | 497 | |
a8f2d0c7 | 498 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 499 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 500 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 501 | if (ret) { |
a8f2d0c7 | 502 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
503 | goto end; |
504 | } | |
505 | ret = lttng_statedump_start(session); | |
360f38ea | 506 | if (ret) |
a8f2d0c7 | 507 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
508 | end: |
509 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 510 | return ret; |
c0e31d2e MD |
511 | } |
512 | ||
8cdc1a81 | 513 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
514 | { |
515 | int ret = 0; | |
f7d06400 | 516 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
517 | |
518 | mutex_lock(&sessions_mutex); | |
519 | if (!session->active) { | |
520 | ret = -EBUSY; | |
521 | goto end; | |
522 | } | |
a8f2d0c7 | 523 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
524 | |
525 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 526 | session->priv->tstate = 0; |
b2bc0bc8 | 527 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
528 | |
529 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
530 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
531 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
532 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 533 | } |
c0e31d2e MD |
534 | end: |
535 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 536 | return ret; |
c0e31d2e MD |
537 | } |
538 | ||
8cdc1a81 | 539 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
540 | { |
541 | int ret = 0; | |
f7d06400 | 542 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 543 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 544 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
545 | struct lttng_metadata_stream *stream; |
546 | ||
547 | mutex_lock(&sessions_mutex); | |
548 | if (!session->active) { | |
549 | ret = -EBUSY; | |
550 | goto end; | |
551 | } | |
552 | ||
553 | mutex_lock(&cache->lock); | |
554 | memset(cache->data, 0, cache->cache_alloc); | |
555 | cache->metadata_written = 0; | |
556 | cache->version++; | |
8cdc1a81 | 557 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
558 | stream->metadata_out = 0; |
559 | stream->metadata_in = 0; | |
560 | } | |
561 | mutex_unlock(&cache->lock); | |
562 | ||
8cdc1a81 | 563 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
564 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
565 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
566 | } |
567 | ||
f237aef8 | 568 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 569 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
570 | } |
571 | ||
572 | ret = _lttng_session_metadata_statedump(session); | |
573 | ||
574 | end: | |
575 | mutex_unlock(&sessions_mutex); | |
576 | return ret; | |
577 | } | |
578 | ||
6b757027 MD |
579 | static |
580 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
581 | { | |
582 | struct lttng_kernel_channel_buffer *chan_buf; | |
583 | ||
584 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
585 | return false; | |
586 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
587 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
588 | return true; | |
589 | return false; | |
590 | } | |
591 | ||
592 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 593 | { |
3c997079 | 594 | int ret = 0; |
e64957da | 595 | |
3c997079 | 596 | mutex_lock(&sessions_mutex); |
6b757027 | 597 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
598 | ret = -EPERM; |
599 | goto end; | |
600 | } | |
6b757027 | 601 | if (channel->enabled) { |
3c997079 MD |
602 | ret = -EEXIST; |
603 | goto end; | |
604 | } | |
605 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
606 | channel->priv->tstate = 1; |
607 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 608 | /* Set atomically the state to "enabled" */ |
6b757027 | 609 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
610 | end: |
611 | mutex_unlock(&sessions_mutex); | |
612 | return ret; | |
e64957da MD |
613 | } |
614 | ||
6b757027 | 615 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 616 | { |
3c997079 | 617 | int ret = 0; |
e64957da | 618 | |
3c997079 | 619 | mutex_lock(&sessions_mutex); |
6b757027 | 620 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
621 | ret = -EPERM; |
622 | goto end; | |
623 | } | |
6b757027 | 624 | if (!channel->enabled) { |
3c997079 MD |
625 | ret = -EEXIST; |
626 | goto end; | |
627 | } | |
628 | /* Set atomically the state to "disabled" */ | |
6b757027 | 629 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 630 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
631 | channel->priv->tstate = 0; |
632 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
633 | end: |
634 | mutex_unlock(&sessions_mutex); | |
635 | return ret; | |
e64957da MD |
636 | } |
637 | ||
9d993668 | 638 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 639 | { |
3c997079 | 640 | int ret = 0; |
e64957da | 641 | |
3c997079 | 642 | mutex_lock(&sessions_mutex); |
9d993668 MD |
643 | switch (event->type) { |
644 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
645 | { | |
646 | struct lttng_kernel_event_recorder *event_recorder = | |
647 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
648 | ||
f7d06400 | 649 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
650 | ret = -EPERM; |
651 | goto end; | |
652 | } | |
a0493bef | 653 | break; |
9d993668 MD |
654 | } |
655 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
656 | switch (event->priv->instrumentation) { | |
657 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
658 | ret = -EINVAL; | |
659 | goto end; | |
660 | default: | |
661 | break; | |
662 | } | |
a0493bef MD |
663 | break; |
664 | default: | |
9d993668 | 665 | break; |
a0493bef | 666 | } |
e64957da | 667 | |
9d993668 | 668 | if (event->enabled) { |
3c997079 MD |
669 | ret = -EEXIST; |
670 | goto end; | |
671 | } | |
a67ba386 | 672 | switch (event->priv->instrumentation) { |
c190d76e MJ |
673 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
674 | lttng_fallthrough; | |
606828e4 | 675 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
676 | ret = -EINVAL; |
677 | break; | |
b4a75708 | 678 | |
c190d76e MJ |
679 | case LTTNG_KERNEL_ABI_KPROBE: |
680 | lttng_fallthrough; | |
606828e4 | 681 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 682 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 683 | break; |
b4a75708 | 684 | |
606828e4 | 685 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 686 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 687 | break; |
b4a75708 | 688 | |
c190d76e MJ |
689 | case LTTNG_KERNEL_ABI_FUNCTION: |
690 | lttng_fallthrough; | |
691 | case LTTNG_KERNEL_ABI_NOOP: | |
692 | lttng_fallthrough; | |
a0493bef MD |
693 | default: |
694 | WARN_ON_ONCE(1); | |
695 | ret = -EINVAL; | |
696 | } | |
3c997079 MD |
697 | end: |
698 | mutex_unlock(&sessions_mutex); | |
699 | return ret; | |
e64957da MD |
700 | } |
701 | ||
9d993668 | 702 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
703 | { |
704 | int ret = 0; | |
705 | ||
706 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
707 | switch (event->type) { |
708 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
709 | { | |
710 | struct lttng_kernel_event_recorder *event_recorder = | |
711 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
712 | ||
f7d06400 | 713 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
714 | ret = -EPERM; |
715 | goto end; | |
716 | } | |
b01155ba | 717 | break; |
9d993668 MD |
718 | } |
719 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
720 | switch (event->priv->instrumentation) { | |
721 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
722 | ret = -EINVAL; | |
723 | goto end; | |
724 | default: | |
725 | break; | |
726 | } | |
2b16f0c9 | 727 | break; |
dffef45d | 728 | default: |
9d993668 | 729 | break; |
dffef45d | 730 | } |
dffef45d | 731 | |
a67ba386 | 732 | if (!event->enabled) { |
dffef45d FD |
733 | ret = -EEXIST; |
734 | goto end; | |
735 | } | |
a67ba386 | 736 | switch (event->priv->instrumentation) { |
c190d76e MJ |
737 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
738 | lttng_fallthrough; | |
606828e4 | 739 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
740 | ret = -EINVAL; |
741 | break; | |
b4a75708 | 742 | |
c190d76e MJ |
743 | case LTTNG_KERNEL_ABI_KPROBE: |
744 | lttng_fallthrough; | |
606828e4 | 745 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 746 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 747 | break; |
b4a75708 | 748 | |
9d993668 MD |
749 | case LTTNG_KERNEL_ABI_KRETPROBE: |
750 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
751 | break; | |
752 | ||
c190d76e MJ |
753 | case LTTNG_KERNEL_ABI_FUNCTION: |
754 | lttng_fallthrough; | |
755 | case LTTNG_KERNEL_ABI_NOOP: | |
756 | lttng_fallthrough; | |
dffef45d FD |
757 | default: |
758 | WARN_ON_ONCE(1); | |
759 | ret = -EINVAL; | |
760 | } | |
761 | end: | |
762 | mutex_unlock(&sessions_mutex); | |
763 | return ret; | |
764 | } | |
765 | ||
4e252d1e | 766 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
767 | const char *transport_name, |
768 | void *buf_addr, | |
4e3c1b9b MD |
769 | size_t subbuf_size, size_t num_subbuf, |
770 | unsigned int switch_timer_interval, | |
d83004aa JD |
771 | unsigned int read_timer_interval, |
772 | enum channel_type channel_type) | |
4e3c1b9b | 773 | { |
f7d06400 MD |
774 | struct lttng_kernel_channel_buffer *chan; |
775 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 776 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
777 | |
778 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 779 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 780 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 781 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 782 | if (!transport) { |
5a15f70c | 783 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 784 | transport_name); |
c0e31d2e | 785 | goto notransport; |
f3d01b96 | 786 | } |
a33c9927 | 787 | if (!try_module_get(transport->owner)) { |
5a15f70c | 788 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
789 | goto notransport; |
790 | } | |
f7d06400 | 791 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 792 | if (!chan) |
c0e31d2e | 793 | goto nomem; |
f7d06400 MD |
794 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
795 | if (!chan_priv) | |
796 | goto nomem_priv; | |
797 | chan->priv = chan_priv; | |
798 | chan_priv->pub = chan; | |
799 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
800 | chan->parent.session = session; | |
801 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 802 | chan->ops = &transport->ops; |
125b4df4 MD |
803 | /* |
804 | * Note: the channel creation op already writes into the packet | |
805 | * headers. Therefore the "chan" information used as input | |
806 | * should be already accessible. | |
807 | */ | |
f7d06400 | 808 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
809 | chan, buf_addr, subbuf_size, num_subbuf, |
810 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 811 | if (!chan->priv->rb_chan) |
f3d01b96 | 812 | goto create_error; |
f7d06400 MD |
813 | chan->priv->parent.tstate = 1; |
814 | chan->parent.enabled = 1; | |
815 | chan->priv->transport = transport; | |
816 | chan->priv->channel_type = channel_type; | |
817 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
818 | mutex_unlock(&sessions_mutex); |
819 | return chan; | |
820 | ||
f3d01b96 | 821 | create_error: |
f7d06400 MD |
822 | kfree(chan_priv); |
823 | nomem_priv: | |
f3d01b96 | 824 | kfree(chan); |
c0e31d2e | 825 | nomem: |
a33c9927 MD |
826 | if (transport) |
827 | module_put(transport->owner); | |
c0e31d2e | 828 | notransport: |
e5382b6d | 829 | active: |
4e3c1b9b MD |
830 | mutex_unlock(&sessions_mutex); |
831 | return NULL; | |
832 | } | |
833 | ||
834 | /* | |
d83004aa JD |
835 | * Only used internally at session destruction for per-cpu channels, and |
836 | * when metadata channel is released. | |
837 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 838 | */ |
aa7c23a9 | 839 | static |
f7d06400 | 840 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 841 | { |
f7d06400 MD |
842 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
843 | module_put(chan->priv->transport->owner); | |
844 | list_del(&chan->priv->node); | |
845 | lttng_kernel_destroy_context(chan->priv->ctx); | |
846 | kfree(chan->priv); | |
4e3c1b9b MD |
847 | kfree(chan); |
848 | } | |
849 | ||
f7d06400 | 850 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 851 | { |
f7d06400 | 852 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
853 | |
854 | /* Protect the metadata cache with the sessions_mutex. */ | |
855 | mutex_lock(&sessions_mutex); | |
856 | _lttng_channel_destroy(chan); | |
857 | mutex_unlock(&sessions_mutex); | |
858 | } | |
859 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
860 | ||
861 | static | |
862 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
863 | { | |
864 | stream->finalized = 1; | |
865 | wake_up_interruptible(&stream->read_wait); | |
866 | } | |
867 | ||
51d248b5 MD |
868 | static |
869 | bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler) | |
870 | { | |
871 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
872 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
873 | ||
874 | switch (event_enabler->enabler_type) { | |
875 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
876 | { | |
877 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
878 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
879 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
880 | ||
881 | switch (itype) { | |
882 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
883 | lttng_fallthrough; | |
884 | case LTTNG_KERNEL_ABI_KPROBE: | |
885 | lttng_fallthrough; | |
886 | case LTTNG_KERNEL_ABI_SYSCALL: | |
887 | lttng_fallthrough; | |
888 | case LTTNG_KERNEL_ABI_UPROBE: | |
889 | if (chan->priv->free_event_id == -1U) | |
890 | return false; | |
891 | return true; | |
892 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
893 | /* kretprobes require 2 event IDs. */ | |
894 | if (chan->priv->free_event_id >= -2U) | |
895 | return false; | |
896 | return true; | |
897 | default: | |
898 | WARN_ON_ONCE(1); | |
899 | return false; | |
900 | } | |
901 | } | |
902 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
903 | return true; | |
904 | default: | |
905 | WARN_ON_ONCE(1); | |
906 | return false; | |
907 | } | |
908 | } | |
909 | ||
756a020c MD |
910 | static |
911 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
912 | { | |
913 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
914 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
915 | ||
916 | switch (event_enabler->enabler_type) { | |
917 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
918 | { | |
919 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
920 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
921 | struct lttng_kernel_event_recorder *event_recorder; | |
922 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
923 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
924 | ||
925 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
926 | if (!event_recorder) | |
927 | return NULL; | |
928 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
929 | if (!event_recorder_priv) { | |
930 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
931 | return NULL; | |
932 | } | |
933 | event_recorder_priv->pub = event_recorder; | |
934 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
935 | event_recorder->priv = event_recorder_priv; | |
936 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
937 | ||
938 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
939 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
940 | event_recorder->priv->parent.instrumentation = itype; | |
941 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
942 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
943 | ||
944 | event_recorder->chan = chan; | |
945 | event_recorder->priv->id = chan->priv->free_event_id++; | |
946 | return &event_recorder->parent; | |
947 | } | |
948 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
949 | { | |
950 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
951 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
952 | struct lttng_kernel_event_notifier *event_notifier; | |
953 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
954 | ||
955 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
956 | if (!event_notifier) | |
957 | return NULL; | |
958 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
959 | if (!event_notifier_priv) { | |
960 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
961 | return NULL; | |
962 | } | |
963 | event_notifier_priv->pub = event_notifier; | |
964 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
965 | event_notifier->priv = event_notifier_priv; | |
966 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
967 | ||
968 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
969 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
970 | event_notifier->priv->parent.instrumentation = itype; | |
971 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
972 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
973 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
974 | ||
975 | event_notifier->priv->group = event_notifier_enabler->group; | |
976 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
977 | event_notifier->priv->num_captures = 0; | |
978 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
979 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
980 | return &event_notifier->parent; | |
981 | } | |
982 | default: | |
983 | return NULL; | |
984 | } | |
985 | } | |
986 | ||
987 | static | |
988 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
989 | { | |
990 | switch (event->type) { | |
991 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
992 | { | |
993 | struct lttng_kernel_event_recorder *event_recorder = | |
994 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
995 | ||
996 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
997 | kmem_cache_free(event_recorder_cache, event_recorder); | |
998 | break; | |
999 | } | |
1000 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1001 | { | |
1002 | struct lttng_kernel_event_notifier *event_notifier = | |
1003 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1004 | ||
1005 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1006 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1007 | break; | |
1008 | } | |
1009 | default: | |
1010 | WARN_ON_ONCE(1); | |
1011 | } | |
1012 | } | |
a101fa10 | 1013 | |
ccefc7ab MD |
1014 | static |
1015 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
1016 | { | |
1017 | switch (event->type) { | |
1018 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1019 | return 0; | |
1020 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1021 | { | |
1022 | struct lttng_kernel_event_notifier *event_notifier = | |
1023 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1024 | struct lttng_counter *error_counter; | |
1025 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
1026 | size_t dimension_index[1]; | |
1027 | int ret; | |
1028 | ||
1029 | /* | |
1030 | * Clear the error counter bucket. The sessiond keeps track of which | |
1031 | * bucket is currently in use. We trust it. The session lock | |
1032 | * synchronizes against concurrent creation of the error | |
1033 | * counter. | |
1034 | */ | |
1035 | error_counter = event_notifier_group->error_counter; | |
1036 | if (!error_counter) | |
1037 | return 0; | |
1038 | /* | |
1039 | * Check that the index is within the boundary of the counter. | |
1040 | */ | |
1041 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1042 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1043 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1047 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1048 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1049 | if (ret) { | |
1050 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1051 | event_notifier->priv->error_counter_index); | |
1052 | return -EINVAL; | |
1053 | } | |
1054 | return 0; | |
1055 | } | |
1056 | default: | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | } | |
1060 | ||
e5382b6d MD |
1061 | /* |
1062 | * Supports event creation while tracing session is active. | |
3c997079 | 1063 | * Needs to be called with sessions mutex held. |
e5382b6d | 1064 | */ |
13a2dfca | 1065 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
def1e304 | 1066 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1067 | { |
13a2dfca MD |
1068 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
1069 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); | |
1070 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
def1e304 | 1071 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1072 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1073 | struct lttng_kernel_event_common *event; |
3c997079 MD |
1074 | const char *event_name; |
1075 | struct hlist_head *head; | |
3d084699 | 1076 | int ret; |
4e3c1b9b | 1077 | |
13a2dfca | 1078 | if (!lttng_kernel_event_id_available(event_enabler)) { |
4cf0bf51 | 1079 | ret = -EMFILE; |
e5382b6d | 1080 | goto full; |
abc0446a | 1081 | } |
3c997079 MD |
1082 | |
1083 | switch (itype) { | |
606828e4 | 1084 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1085 | event_name = event_desc->event_name; |
3c997079 | 1086 | break; |
b4a75708 | 1087 | |
c190d76e MJ |
1088 | case LTTNG_KERNEL_ABI_KPROBE: |
1089 | lttng_fallthrough; | |
1090 | case LTTNG_KERNEL_ABI_UPROBE: | |
1091 | lttng_fallthrough; | |
1092 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1093 | lttng_fallthrough; | |
606828e4 | 1094 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1095 | event_name = event_param->name; |
1096 | break; | |
b4a75708 | 1097 | |
c190d76e MJ |
1098 | case LTTNG_KERNEL_ABI_FUNCTION: |
1099 | lttng_fallthrough; | |
1100 | case LTTNG_KERNEL_ABI_NOOP: | |
1101 | lttng_fallthrough; | |
3c997079 MD |
1102 | default: |
1103 | WARN_ON_ONCE(1); | |
1104 | ret = -EINVAL; | |
1105 | goto type_error; | |
1106 | } | |
4a11ef1c | 1107 | |
0def9170 | 1108 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1109 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
13a2dfca | 1110 | if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) { |
3c997079 MD |
1111 | ret = -EEXIST; |
1112 | goto exist; | |
abc0446a MD |
1113 | } |
1114 | } | |
3c997079 | 1115 | |
13a2dfca | 1116 | event = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1117 | if (!event) { |
4cf0bf51 | 1118 | ret = -ENOMEM; |
756a020c | 1119 | goto alloc_error; |
abc0446a | 1120 | } |
3c997079 MD |
1121 | |
1122 | switch (itype) { | |
606828e4 | 1123 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1124 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1125 | event->enabled = 0; |
1126 | event->priv->registered = 0; | |
1127 | event->priv->desc = lttng_event_desc_get(event_name); | |
1128 | if (!event->priv->desc) { | |
4cf0bf51 | 1129 | ret = -ENOENT; |
d3dbe23c | 1130 | goto register_error; |
abc0446a | 1131 | } |
3c997079 MD |
1132 | /* Populate lttng_event structure before event registration. */ |
1133 | smp_wmb(); | |
baf20995 | 1134 | break; |
b4a75708 | 1135 | |
606828e4 | 1136 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1137 | /* |
1138 | * Needs to be explicitly enabled after creation, since | |
1139 | * we may want to apply filters. | |
1140 | */ | |
7cd0f696 MD |
1141 | event->enabled = 0; |
1142 | event->priv->registered = 1; | |
3c997079 MD |
1143 | /* |
1144 | * Populate lttng_event structure before event | |
1145 | * registration. | |
1146 | */ | |
1147 | smp_wmb(); | |
8bf17deb | 1148 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1149 | event_param->u.kprobe.symbol_name, |
1150 | event_param->u.kprobe.offset, | |
1151 | event_param->u.kprobe.addr, | |
7cd0f696 | 1152 | event); |
abc0446a | 1153 | if (ret) { |
4cf0bf51 | 1154 | ret = -EINVAL; |
d6d808f3 | 1155 | goto register_error; |
abc0446a | 1156 | } |
7cd0f696 | 1157 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1158 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1159 | break; |
b4a75708 | 1160 | |
606828e4 | 1161 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1162 | { |
756a020c | 1163 | struct lttng_kernel_event_common *event_return; |
7371f44c MD |
1164 | |
1165 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1166 | /* |
1167 | * Needs to be explicitly enabled after creation, since | |
1168 | * we may want to apply filters. | |
1169 | */ | |
756a020c MD |
1170 | event->enabled = 0; |
1171 | event->priv->registered = 1; | |
a67ba386 | 1172 | |
13a2dfca | 1173 | event_return = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1174 | if (!event) { |
a67ba386 | 1175 | ret = -ENOMEM; |
756a020c | 1176 | goto alloc_error; |
a67ba386 | 1177 | } |
756a020c MD |
1178 | |
1179 | event_return->enabled = 0; | |
1180 | event_return->priv->registered = 1; | |
1181 | ||
7371f44c | 1182 | /* |
a90917c3 | 1183 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1184 | */ |
1185 | smp_wmb(); | |
3c997079 | 1186 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1187 | event_param->u.kretprobe.symbol_name, |
1188 | event_param->u.kretprobe.offset, | |
1189 | event_param->u.kretprobe.addr, | |
756a020c | 1190 | event, event_return); |
7371f44c | 1191 | if (ret) { |
756a020c | 1192 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1193 | ret = -EINVAL; |
7371f44c MD |
1194 | goto register_error; |
1195 | } | |
1196 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1197 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1198 | WARN_ON_ONCE(!ret); |
756a020c | 1199 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1200 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1201 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1202 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1203 | if (ret) { |
756a020c | 1204 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1205 | module_put(event_return->priv->desc->owner); |
1206 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1207 | goto statedump_error; |
1208 | } | |
19b98250 | 1209 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1210 | break; |
1211 | } | |
b4a75708 | 1212 | |
606828e4 | 1213 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1214 | /* |
1215 | * Needs to be explicitly enabled after creation, since | |
1216 | * we may want to apply filters. | |
1217 | */ | |
7cd0f696 MD |
1218 | event->enabled = 0; |
1219 | event->priv->registered = 0; | |
1220 | event->priv->desc = event_desc; | |
badfe9f5 | 1221 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1222 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1223 | ret = -EINVAL; |
1224 | goto register_error; | |
606828e4 | 1225 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1226 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1227 | break; |
606828e4 | 1228 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1229 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1230 | break; |
1231 | } | |
1232 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1233 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1234 | ret = -EINVAL; |
1235 | goto register_error; | |
606828e4 | 1236 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1237 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1238 | break; |
606828e4 | 1239 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1240 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1241 | break; |
1242 | } | |
7cd0f696 | 1243 | if (!event->priv->desc) { |
4cf0bf51 | 1244 | ret = -EINVAL; |
259b6cb3 | 1245 | goto register_error; |
abc0446a | 1246 | } |
1ec65de1 | 1247 | break; |
b4a75708 | 1248 | |
606828e4 | 1249 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1250 | /* |
1251 | * Needs to be explicitly enabled after creation, since | |
1252 | * we may want to apply filters. | |
1253 | */ | |
7cd0f696 MD |
1254 | event->enabled = 0; |
1255 | event->priv->registered = 1; | |
3aed4dca | 1256 | |
a344f64b FD |
1257 | /* |
1258 | * Populate lttng_event structure before event | |
1259 | * registration. | |
1260 | */ | |
1261 | smp_wmb(); | |
149b9a9d | 1262 | |
83b802dc | 1263 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1264 | event_param->u.uprobe.fd, |
7cd0f696 | 1265 | event); |
149b9a9d YB |
1266 | if (ret) |
1267 | goto register_error; | |
7cd0f696 | 1268 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1269 | WARN_ON_ONCE(!ret); |
1270 | break; | |
b4a75708 | 1271 | |
baf20995 MD |
1272 | default: |
1273 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1274 | ret = -EINVAL; |
df07930b | 1275 | goto register_error; |
baf20995 | 1276 | } |
13a2dfca | 1277 | |
ee7e9a18 | 1278 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1279 | WARN_ON_ONCE(ret > 0); |
1280 | if (ret) { | |
c099397a | 1281 | goto statedump_error; |
abc0446a | 1282 | } |
dffef45d | 1283 | |
ccefc7ab MD |
1284 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1285 | if (ret) | |
1286 | goto register_error; | |
c4e31059 | 1287 | |
c4e31059 | 1288 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1289 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1290 | |
13a2dfca | 1291 | return event; |
dffef45d | 1292 | |
13a2dfca MD |
1293 | statedump_error: |
1294 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1295 | register_error: |
756a020c MD |
1296 | lttng_kernel_event_free(event); |
1297 | alloc_error: | |
dffef45d FD |
1298 | exist: |
1299 | type_error: | |
13a2dfca | 1300 | full: |
dffef45d FD |
1301 | return ERR_PTR(ret); |
1302 | } | |
1303 | ||
83006ee0 MD |
1304 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1305 | const struct lttng_kernel_event_desc *event_desc) | |
1306 | { | |
1307 | struct lttng_kernel_event_common *event; | |
1308 | ||
1309 | mutex_lock(&sessions_mutex); | |
1310 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1311 | mutex_unlock(&sessions_mutex); | |
1312 | return event; | |
1313 | } | |
1314 | ||
99f52fcc FD |
1315 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1316 | const size_t *dim_indexes, int32_t cpu, | |
1317 | int64_t *val, bool *overflow, bool *underflow) | |
1318 | { | |
1319 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1320 | cpu, val, overflow, underflow); | |
1321 | } | |
1322 | ||
1323 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1324 | const size_t *dim_indexes, int64_t *val, | |
1325 | bool *overflow, bool *underflow) | |
1326 | { | |
1327 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1328 | val, overflow, underflow); | |
1329 | } | |
1330 | ||
1331 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1332 | const size_t *dim_indexes) | |
1333 | { | |
1334 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1335 | } | |
1336 | ||
6a338ba4 | 1337 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1338 | static |
0c851fa0 | 1339 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1340 | { |
437d5aa5 | 1341 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1342 | int ret = -EINVAL; |
3c997079 | 1343 | |
6a338ba4 | 1344 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1345 | |
0c851fa0 MD |
1346 | desc = event->priv->desc; |
1347 | switch (event->priv->instrumentation) { | |
606828e4 | 1348 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1349 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1350 | desc->tp_class->probe_callback, |
0c851fa0 | 1351 | event); |
4ecb5ad5 | 1352 | break; |
b4a75708 | 1353 | |
606828e4 | 1354 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1355 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1356 | break; |
b4a75708 | 1357 | |
c190d76e MJ |
1358 | case LTTNG_KERNEL_ABI_KPROBE: |
1359 | lttng_fallthrough; | |
1360 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1361 | ret = 0; |
f0bcc14c | 1362 | break; |
0c851fa0 MD |
1363 | |
1364 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1365 | switch (event->type) { | |
1366 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1367 | ret = 0; | |
1368 | break; | |
1369 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1370 | WARN_ON_ONCE(1); | |
1371 | break; | |
1372 | } | |
4ecb5ad5 | 1373 | break; |
b4a75708 | 1374 | |
c190d76e MJ |
1375 | case LTTNG_KERNEL_ABI_FUNCTION: |
1376 | lttng_fallthrough; | |
1377 | case LTTNG_KERNEL_ABI_NOOP: | |
1378 | lttng_fallthrough; | |
4ecb5ad5 MD |
1379 | default: |
1380 | WARN_ON_ONCE(1); | |
1381 | } | |
6a338ba4 | 1382 | WARN_ON_ONCE(ret); |
3c997079 | 1383 | if (!ret) |
0c851fa0 | 1384 | event->priv->registered = 1; |
3c997079 MD |
1385 | } |
1386 | ||
6a338ba4 MD |
1387 | static |
1388 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1389 | { |
f0bcc14c | 1390 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1391 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1392 | int ret = -EINVAL; |
1393 | ||
6a338ba4 | 1394 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1395 | |
a67ba386 MD |
1396 | desc = event_priv->desc; |
1397 | switch (event_priv->instrumentation) { | |
606828e4 | 1398 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1399 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1400 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1401 | event); |
baf20995 | 1402 | break; |
b4a75708 | 1403 | |
606828e4 | 1404 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1405 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1406 | ret = 0; |
1407 | break; | |
b4a75708 | 1408 | |
606828e4 | 1409 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1410 | switch (event->type) { |
1411 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1412 | lttng_kretprobes_unregister(event); | |
1413 | ret = 0; | |
1414 | break; | |
1415 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1416 | WARN_ON_ONCE(1); | |
1417 | break; | |
1418 | } | |
7371f44c | 1419 | break; |
b4a75708 | 1420 | |
606828e4 | 1421 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1422 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1423 | break; |
b4a75708 | 1424 | |
606828e4 | 1425 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1426 | switch (event->type) { |
1427 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1428 | ret = 0; | |
1429 | break; | |
1430 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1431 | WARN_ON_ONCE(1); | |
1432 | break; | |
1433 | } | |
259b6cb3 | 1434 | break; |
b4a75708 | 1435 | |
606828e4 | 1436 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1437 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1438 | ret = 0; |
1439 | break; | |
b4a75708 | 1440 | |
c190d76e MJ |
1441 | case LTTNG_KERNEL_ABI_FUNCTION: |
1442 | lttng_fallthrough; | |
baf20995 MD |
1443 | default: |
1444 | WARN_ON_ONCE(1); | |
1445 | } | |
6a338ba4 | 1446 | WARN_ON_ONCE(ret); |
3c997079 | 1447 | if (!ret) |
a67ba386 | 1448 | event_priv->registered = 0; |
6a338ba4 MD |
1449 | } |
1450 | ||
1451 | static | |
1452 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1453 | { | |
1454 | if (event->priv->registered) | |
1455 | unregister_event(event); | |
dda6a249 MD |
1456 | } |
1457 | ||
1458 | /* | |
1459 | * Only used internally at session destruction. | |
1460 | */ | |
be066e6c | 1461 | static |
0648898e | 1462 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1463 | { |
0648898e | 1464 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1465 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1466 | ||
0648898e MD |
1467 | lttng_free_event_filter_runtime(event); |
1468 | /* Free event enabler refs */ | |
1469 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1470 | &event_priv->enablers_ref_head, node) | |
1471 | kfree(enabler_ref); | |
b4a75708 | 1472 | |
0648898e MD |
1473 | switch (event->type) { |
1474 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1475 | { | |
1476 | struct lttng_kernel_event_recorder *event_recorder = | |
1477 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1478 | |
0648898e MD |
1479 | switch (event_priv->instrumentation) { |
1480 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1481 | lttng_event_desc_put(event_priv->desc); | |
1482 | break; | |
b4a75708 | 1483 | |
0648898e MD |
1484 | case LTTNG_KERNEL_ABI_KPROBE: |
1485 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1486 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1487 | break; |
b4a75708 | 1488 | |
0648898e MD |
1489 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1490 | module_put(event_priv->desc->owner); | |
eb6b47db | 1491 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1492 | break; |
b4a75708 | 1493 | |
0648898e MD |
1494 | case LTTNG_KERNEL_ABI_SYSCALL: |
1495 | break; | |
4e3c1b9b | 1496 | |
0648898e MD |
1497 | case LTTNG_KERNEL_ABI_UPROBE: |
1498 | module_put(event_priv->desc->owner); | |
17806c46 | 1499 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1500 | break; |
3ef5cc03 | 1501 | |
c190d76e MJ |
1502 | case LTTNG_KERNEL_ABI_FUNCTION: |
1503 | lttng_fallthrough; | |
1504 | case LTTNG_KERNEL_ABI_NOOP: | |
1505 | lttng_fallthrough; | |
0648898e MD |
1506 | default: |
1507 | WARN_ON_ONCE(1); | |
1508 | } | |
f237aef8 | 1509 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1510 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1511 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1512 | break; |
0648898e MD |
1513 | } |
1514 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1515 | { | |
1516 | struct lttng_kernel_event_notifier *event_notifier = | |
1517 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1518 | |
0648898e MD |
1519 | switch (event_notifier->priv->parent.instrumentation) { |
1520 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1521 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1522 | break; | |
b4a75708 | 1523 | |
0648898e MD |
1524 | case LTTNG_KERNEL_ABI_KPROBE: |
1525 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1526 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1527 | break; |
b4a75708 | 1528 | |
0648898e MD |
1529 | case LTTNG_KERNEL_ABI_SYSCALL: |
1530 | break; | |
b4a75708 | 1531 | |
0648898e MD |
1532 | case LTTNG_KERNEL_ABI_UPROBE: |
1533 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1534 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1535 | break; |
1536 | ||
c190d76e MJ |
1537 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1538 | lttng_fallthrough; | |
1539 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1540 | lttng_fallthrough; | |
1541 | case LTTNG_KERNEL_ABI_NOOP: | |
1542 | lttng_fallthrough; | |
0648898e MD |
1543 | default: |
1544 | WARN_ON_ONCE(1); | |
1545 | } | |
f237aef8 | 1546 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1547 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1548 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1549 | break; | |
1550 | } | |
dffef45d FD |
1551 | default: |
1552 | WARN_ON_ONCE(1); | |
1553 | } | |
dffef45d FD |
1554 | } |
1555 | ||
8c0393c3 | 1556 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1557 | enum tracker_type tracker_type) |
e0130fab | 1558 | { |
d1f652f8 MD |
1559 | switch (tracker_type) { |
1560 | case TRACKER_PID: | |
1561 | return &session->pid_tracker; | |
1562 | case TRACKER_VPID: | |
1563 | return &session->vpid_tracker; | |
1564 | case TRACKER_UID: | |
1565 | return &session->uid_tracker; | |
1566 | case TRACKER_VUID: | |
1567 | return &session->vuid_tracker; | |
1568 | case TRACKER_GID: | |
1569 | return &session->gid_tracker; | |
1570 | case TRACKER_VGID: | |
1571 | return &session->vgid_tracker; | |
1572 | default: | |
1573 | WARN_ON_ONCE(1); | |
1574 | return NULL; | |
1575 | } | |
1576 | } | |
1577 | ||
8cdc1a81 | 1578 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1579 | enum tracker_type tracker_type, int id) |
1580 | { | |
8c0393c3 | 1581 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1582 | int ret; |
1583 | ||
d1f652f8 MD |
1584 | tracker = get_tracker(session, tracker_type); |
1585 | if (!tracker) | |
1586 | return -EINVAL; | |
1587 | if (id < -1) | |
e0130fab MD |
1588 | return -EINVAL; |
1589 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1590 | if (id == -1) { |
1591 | /* track all ids: destroy tracker. */ | |
1592 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1593 | ret = 0; |
1594 | } else { | |
d1f652f8 | 1595 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1596 | } |
e0130fab MD |
1597 | mutex_unlock(&sessions_mutex); |
1598 | return ret; | |
1599 | } | |
1600 | ||
8cdc1a81 | 1601 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1602 | enum tracker_type tracker_type, int id) |
e0130fab | 1603 | { |
8c0393c3 | 1604 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1605 | int ret; |
1606 | ||
d1f652f8 MD |
1607 | tracker = get_tracker(session, tracker_type); |
1608 | if (!tracker) | |
1609 | return -EINVAL; | |
1610 | if (id < -1) | |
e0130fab MD |
1611 | return -EINVAL; |
1612 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1613 | if (id == -1) { |
1614 | /* untrack all ids: replace by empty tracker. */ | |
1615 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1616 | } else { |
d1f652f8 | 1617 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1618 | } |
e0130fab MD |
1619 | mutex_unlock(&sessions_mutex); |
1620 | return ret; | |
1621 | } | |
1622 | ||
7e6f9ef6 | 1623 | static |
d1f652f8 | 1624 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1625 | { |
8c0393c3 MD |
1626 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1627 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1628 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1629 | int iter = 0, i; |
1630 | ||
1631 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1632 | if (id_tracker_p) { |
1633 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1634 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1635 | |
f934e302 | 1636 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1637 | if (iter++ >= *pos) |
1638 | return e; | |
1639 | } | |
1640 | } | |
1641 | } else { | |
d1f652f8 | 1642 | /* ID tracker disabled. */ |
7e6f9ef6 | 1643 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1644 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1645 | } |
1646 | iter++; | |
1647 | } | |
1648 | /* End of list */ | |
1649 | return NULL; | |
1650 | } | |
1651 | ||
1652 | /* Called with sessions_mutex held. */ | |
1653 | static | |
d1f652f8 | 1654 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1655 | { |
8c0393c3 MD |
1656 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1657 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1658 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1659 | int iter = 0, i; |
1660 | ||
1661 | (*ppos)++; | |
d1f652f8 MD |
1662 | if (id_tracker_p) { |
1663 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1664 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1665 | |
f934e302 | 1666 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1667 | if (iter++ >= *ppos) |
1668 | return e; | |
1669 | } | |
1670 | } | |
1671 | } else { | |
d1f652f8 | 1672 | /* ID tracker disabled. */ |
7e6f9ef6 | 1673 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1674 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1675 | iter++; |
1676 | } | |
1677 | ||
1678 | /* End of list */ | |
1679 | return NULL; | |
1680 | } | |
1681 | ||
1682 | static | |
d1f652f8 | 1683 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1684 | { |
1685 | mutex_unlock(&sessions_mutex); | |
1686 | } | |
1687 | ||
1688 | static | |
d1f652f8 | 1689 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1690 | { |
8c0393c3 MD |
1691 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1692 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1693 | int id; |
7e6f9ef6 | 1694 | |
d1f652f8 | 1695 | if (p == id_tracker_p) { |
7e6f9ef6 | 1696 | /* Tracker disabled. */ |
d1f652f8 | 1697 | id = -1; |
7e6f9ef6 | 1698 | } else { |
d1f652f8 | 1699 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1700 | |
d1f652f8 MD |
1701 | id = lttng_id_tracker_get_node_id(e); |
1702 | } | |
8c0393c3 | 1703 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1704 | case TRACKER_PID: |
1705 | seq_printf(m, "process { pid = %d; };\n", id); | |
1706 | break; | |
1707 | case TRACKER_VPID: | |
1708 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1709 | break; | |
1710 | case TRACKER_UID: | |
1711 | seq_printf(m, "user { uid = %d; };\n", id); | |
1712 | break; | |
1713 | case TRACKER_VUID: | |
1714 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1715 | break; | |
1716 | case TRACKER_GID: | |
1717 | seq_printf(m, "group { gid = %d; };\n", id); | |
1718 | break; | |
1719 | case TRACKER_VGID: | |
1720 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1721 | break; | |
1722 | default: | |
1723 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1724 | } |
7e6f9ef6 MD |
1725 | return 0; |
1726 | } | |
1727 | ||
1728 | static | |
d1f652f8 MD |
1729 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1730 | .start = id_list_start, | |
1731 | .next = id_list_next, | |
1732 | .stop = id_list_stop, | |
1733 | .show = id_list_show, | |
7e6f9ef6 MD |
1734 | }; |
1735 | ||
1736 | static | |
d1f652f8 | 1737 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1738 | { |
d1f652f8 | 1739 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1740 | } |
1741 | ||
1742 | static | |
d1f652f8 | 1743 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1744 | { |
1745 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1746 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1747 | int ret; |
1748 | ||
d1f652f8 | 1749 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1750 | ret = seq_release(inode, file); |
d1f652f8 | 1751 | if (!ret) |
8c0393c3 | 1752 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1753 | return ret; |
1754 | } | |
1755 | ||
d1f652f8 | 1756 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1757 | .owner = THIS_MODULE, |
d1f652f8 | 1758 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1759 | .read = seq_read, |
1760 | .llseek = seq_lseek, | |
d1f652f8 | 1761 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1762 | }; |
1763 | ||
8cdc1a81 | 1764 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1765 | enum tracker_type tracker_type) |
7e6f9ef6 | 1766 | { |
d1f652f8 | 1767 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1768 | struct seq_file *m; |
1769 | int file_fd, ret; | |
1770 | ||
2a059b14 | 1771 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1772 | if (file_fd < 0) { |
1773 | ret = file_fd; | |
1774 | goto fd_error; | |
1775 | } | |
1776 | ||
d1f652f8 MD |
1777 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1778 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1779 | NULL, O_RDWR); |
d1f652f8 MD |
1780 | if (IS_ERR(tracker_ids_list_file)) { |
1781 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1782 | goto file_error; |
1783 | } | |
8cdc1a81 | 1784 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1785 | ret = -EOVERFLOW; |
9c1f4643 MD |
1786 | goto refcount_error; |
1787 | } | |
d1f652f8 | 1788 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1789 | if (ret < 0) |
1790 | goto open_error; | |
d1f652f8 MD |
1791 | m = tracker_ids_list_file->private_data; |
1792 | ||
1793 | m->private = get_tracker(session, tracker_type); | |
1794 | BUG_ON(!m->private); | |
1795 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1796 | |
1797 | return file_fd; | |
1798 | ||
1799 | open_error: | |
8cdc1a81 | 1800 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1801 | refcount_error: |
d1f652f8 | 1802 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1803 | file_error: |
1804 | put_unused_fd(file_fd); | |
1805 | fd_error: | |
1806 | return ret; | |
1807 | } | |
1808 | ||
3c997079 MD |
1809 | /* |
1810 | * Enabler management. | |
1811 | */ | |
1812 | static | |
4993071a PP |
1813 | int lttng_match_enabler_star_glob(const char *desc_name, |
1814 | const char *pattern) | |
3c997079 | 1815 | { |
cbc19040 MD |
1816 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1817 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1818 | return 0; |
1819 | return 1; | |
1820 | } | |
1821 | ||
1822 | static | |
4ecb5ad5 MD |
1823 | int lttng_match_enabler_name(const char *desc_name, |
1824 | const char *name) | |
3c997079 | 1825 | { |
4ecb5ad5 | 1826 | if (strcmp(desc_name, name)) |
3c997079 MD |
1827 | return 0; |
1828 | return 1; | |
1829 | } | |
1830 | ||
8bff0fc3 MD |
1831 | static |
1832 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1833 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1834 | { |
4ecb5ad5 | 1835 | const char *desc_name, *enabler_name; |
badfe9f5 | 1836 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1837 | |
1838 | enabler_name = enabler->event_param.name; | |
1839 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1840 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1841 | desc_name = desc->event_name; |
3b861b22 FD |
1842 | switch (enabler->format_type) { |
1843 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1844 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1845 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1846 | return lttng_match_enabler_name(desc_name, enabler_name); |
1847 | default: | |
1848 | return -EINVAL; | |
1849 | } | |
4ecb5ad5 | 1850 | break; |
b4a75708 | 1851 | |
606828e4 | 1852 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1853 | desc_name = desc->event_name; |
badfe9f5 | 1854 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1855 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1856 | compat = true; |
1857 | } | |
4ecb5ad5 MD |
1858 | if (!strncmp(desc_name, "syscall_exit_", |
1859 | strlen("syscall_exit_"))) { | |
1860 | desc_name += strlen("syscall_exit_"); | |
1861 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1862 | strlen("syscall_entry_"))) { | |
1863 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1864 | entry = true; |
4ecb5ad5 MD |
1865 | } else { |
1866 | WARN_ON_ONCE(1); | |
1867 | return -EINVAL; | |
1868 | } | |
badfe9f5 | 1869 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1870 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1871 | break; |
606828e4 | 1872 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1873 | if (!entry) |
1874 | return 0; | |
1875 | break; | |
606828e4 | 1876 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1877 | if (entry) |
1878 | return 0; | |
1879 | break; | |
1880 | default: | |
1881 | return -EINVAL; | |
1882 | } | |
1883 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1884 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1885 | break; |
606828e4 | 1886 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1887 | if (compat) |
1888 | return 0; | |
1889 | break; | |
606828e4 | 1890 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1891 | if (!compat) |
1892 | return 0; | |
1893 | break; | |
1894 | default: | |
1895 | return -EINVAL; | |
1896 | } | |
1897 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1898 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1899 | switch (enabler->format_type) { |
1900 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1901 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1902 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1903 | return lttng_match_enabler_name(desc_name, enabler_name); |
1904 | default: | |
1905 | return -EINVAL; | |
1906 | } | |
1907 | break; | |
606828e4 | 1908 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1909 | return -EINVAL; /* Not implemented. */ |
1910 | default: | |
1911 | return -EINVAL; | |
1912 | } | |
4ecb5ad5 | 1913 | break; |
b4a75708 | 1914 | |
4ecb5ad5 MD |
1915 | default: |
1916 | WARN_ON_ONCE(1); | |
1917 | return -EINVAL; | |
1918 | } | |
3c997079 MD |
1919 | } |
1920 | ||
8bff0fc3 MD |
1921 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1922 | struct lttng_event_enabler_common *enabler) | |
1923 | { | |
1924 | int ret; | |
1925 | ||
1926 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1927 | if (ret < 0) { | |
1928 | WARN_ON_ONCE(1); | |
1929 | return false; | |
1930 | } | |
1931 | return ret; | |
1932 | } | |
1933 | ||
5c6ec66a MD |
1934 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1935 | struct lttng_kernel_event_common *event) | |
3c997079 | 1936 | { |
5c6ec66a MD |
1937 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1938 | return false; | |
b2bc0bc8 | 1939 | |
5c6ec66a MD |
1940 | switch (event_enabler->enabler_type) { |
1941 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1942 | { | |
1943 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1944 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1945 | struct lttng_kernel_event_recorder *event_recorder = | |
1946 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1947 | ||
1948 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1949 | && event_recorder->chan == event_recorder_enabler->chan) | |
1950 | return true; | |
1951 | else | |
1952 | return false; | |
1953 | } | |
1954 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1955 | { | |
1956 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1957 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1958 | struct lttng_kernel_event_notifier *event_notifier = | |
1959 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1960 | ||
1961 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1962 | && event_notifier->priv->group == event_notifier_enabler->group | |
1963 | && event->priv->user_token == event_enabler->user_token) | |
1964 | return true; | |
1965 | else | |
1966 | return false; | |
1967 | } | |
1968 | default: | |
1969 | WARN_ON_ONCE(1); | |
1970 | return false; | |
1971 | } | |
3c997079 MD |
1972 | } |
1973 | ||
5c6ec66a MD |
1974 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1975 | const struct lttng_kernel_event_desc *desc, | |
1976 | struct lttng_kernel_event_common *event) | |
b01155ba | 1977 | { |
5c6ec66a MD |
1978 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1979 | return false; | |
b01155ba | 1980 | |
5c6ec66a MD |
1981 | switch (event_enabler->enabler_type) { |
1982 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1983 | { | |
1984 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1985 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1986 | struct lttng_kernel_event_recorder *event_recorder = | |
1987 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1988 | ||
1989 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1990 | return true; | |
1991 | else | |
1992 | return false; | |
1993 | } | |
1994 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1995 | { | |
1996 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1997 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1998 | struct lttng_kernel_event_notifier *event_notifier = | |
1999 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2000 | ||
2001 | if (event->priv->desc == desc | |
2002 | && event_notifier->priv->group == event_notifier_enabler->group | |
2003 | && event->priv->user_token == event_enabler->user_token) | |
2004 | return true; | |
2005 | else | |
2006 | return false; | |
2007 | } | |
2008 | default: | |
2009 | WARN_ON_ONCE(1); | |
2010 | return false; | |
2011 | } | |
b01155ba FD |
2012 | } |
2013 | ||
0d223dc6 MD |
2014 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2015 | const char *event_name, | |
2016 | struct lttng_kernel_event_common *event) | |
2017 | { | |
2018 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2019 | return false; | |
2020 | ||
2021 | switch (event_enabler->enabler_type) { | |
2022 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2023 | { | |
2024 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2025 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2026 | struct lttng_kernel_event_recorder *event_recorder = | |
2027 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2028 | ||
2029 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2030 | && event_recorder->chan == event_recorder_enabler->chan) | |
2031 | return true; | |
2032 | else | |
2033 | return false; | |
2034 | } | |
2035 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2036 | { | |
2037 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2038 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2039 | struct lttng_kernel_event_notifier *event_notifier = | |
2040 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2041 | ||
2042 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2043 | && event_notifier->priv->group == event_notifier_enabler->group | |
2044 | && event->priv->user_token == event_enabler->user_token) | |
2045 | return true; | |
2046 | else | |
2047 | return false; | |
2048 | } | |
2049 | default: | |
2050 | WARN_ON_ONCE(1); | |
2051 | return false; | |
2052 | } | |
2053 | } | |
2054 | ||
3c997079 | 2055 | static |
b2bc0bc8 FD |
2056 | struct lttng_enabler_ref *lttng_enabler_ref( |
2057 | struct list_head *enablers_ref_list, | |
8d554755 | 2058 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2059 | { |
2060 | struct lttng_enabler_ref *enabler_ref; | |
2061 | ||
b2bc0bc8 | 2062 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2063 | if (enabler_ref->ref == enabler) |
2064 | return enabler_ref; | |
2065 | } | |
2066 | return NULL; | |
2067 | } | |
2068 | ||
3c997079 | 2069 | static |
b2f63bde | 2070 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2071 | { |
c8e14380 | 2072 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2073 | struct lttng_kernel_probe_desc *probe_desc; |
2074 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2075 | struct list_head *probe_list; |
c8e14380 | 2076 | int i; |
3c997079 MD |
2077 | |
2078 | probe_list = lttng_get_probe_list_head(); | |
2079 | /* | |
2080 | * For each probe event, if we find that a probe event matches | |
2081 | * our enabler, create an associated lttng_event if not | |
2082 | * already present. | |
2083 | */ | |
2084 | list_for_each_entry(probe_desc, probe_list, head) { | |
2085 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2086 | bool found = false; |
3c997079 | 2087 | struct hlist_head *head; |
83006ee0 | 2088 | struct lttng_kernel_event_common *event; |
19bef247 | 2089 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2090 | |
2091 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2092 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2093 | continue; |
3c997079 MD |
2094 | |
2095 | /* | |
2096 | * Check if already created. | |
2097 | */ | |
0def9170 | 2098 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2099 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2100 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2101 | found = true; | |
2102 | break; | |
2103 | } | |
3c997079 MD |
2104 | } |
2105 | if (found) | |
2106 | continue; | |
2107 | ||
2108 | /* | |
83006ee0 | 2109 | * We need to create an event for this event probe. |
3c997079 | 2110 | */ |
c8e14380 | 2111 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2112 | if (IS_ERR(event)) { |
5a15f70c | 2113 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2114 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2115 | } |
2116 | } | |
2117 | } | |
2118 | } | |
2119 | ||
33a39a3c | 2120 | /* |
8839618b | 2121 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2122 | * Should be called with sessions mutex held. |
2123 | */ | |
2124 | static | |
b2f63bde | 2125 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2126 | { |
b2f63bde MD |
2127 | int ret; |
2128 | ||
8839618b | 2129 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2130 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2131 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2132 | break; |
b4a75708 | 2133 | |
606828e4 | 2134 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2135 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2136 | WARN_ON_ONCE(ret); | |
33a39a3c | 2137 | break; |
b4a75708 | 2138 | |
33a39a3c MD |
2139 | default: |
2140 | WARN_ON_ONCE(1); | |
2141 | break; | |
2142 | } | |
2143 | } | |
2144 | ||
d619fae9 MD |
2145 | static |
2146 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2147 | struct lttng_kernel_event_common *event) | |
2148 | { | |
2149 | /* Link filter bytecodes if not linked yet. */ | |
2150 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2151 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2152 | } | |
2153 | ||
1e06b222 MD |
2154 | static |
2155 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2156 | struct lttng_kernel_event_common *event) | |
2157 | { | |
2158 | switch (event_enabler->enabler_type) { | |
2159 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2160 | break; | |
2161 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2162 | { | |
2163 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2164 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2165 | struct lttng_kernel_event_notifier *event_notifier = | |
2166 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2167 | ||
2168 | /* Link capture bytecodes if not linked yet. */ | |
2169 | lttng_enabler_link_bytecode(event->priv->desc, | |
2170 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2171 | &event_notifier_enabler->capture_bytecode_head); | |
2172 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2173 | break; | |
2174 | } | |
2175 | default: | |
2176 | WARN_ON_ONCE(1); | |
2177 | } | |
2178 | } | |
2179 | ||
3c997079 | 2180 | /* |
b2bc0bc8 | 2181 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2182 | * and add backward reference from the event to the enabler. |
2183 | * Should be called with sessions mutex held. | |
2184 | */ | |
2185 | static | |
3622cd47 | 2186 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2187 | { |
3622cd47 MD |
2188 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2189 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2190 | |
3622cd47 | 2191 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2192 | |
3c997079 | 2193 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2194 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2195 | |
3622cd47 MD |
2196 | /* Link the created event with its associated enabler. */ |
2197 | list_for_each_entry(event_priv, event_list_head, node) { | |
2198 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2199 | struct lttng_enabler_ref *enabler_ref; |
2200 | ||
3622cd47 | 2201 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2202 | continue; |
2203 | ||
3622cd47 | 2204 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2205 | if (!enabler_ref) { |
2206 | /* | |
2207 | * If no backward ref, create it. | |
2208 | * Add backward ref from event_notifier to enabler. | |
2209 | */ | |
2210 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2211 | if (!enabler_ref) | |
2212 | return -ENOMEM; | |
2213 | ||
3622cd47 MD |
2214 | enabler_ref->ref = event_enabler; |
2215 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2216 | } |
2217 | ||
3622cd47 MD |
2218 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2219 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2220 | } |
2221 | return 0; | |
2222 | } | |
2223 | ||
3c997079 MD |
2224 | /* |
2225 | * Called at module load: connect the probe on all enablers matching | |
2226 | * this event. | |
2227 | * Called with sessions lock held. | |
2228 | */ | |
2229 | int lttng_fix_pending_events(void) | |
2230 | { | |
8cdc1a81 | 2231 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2232 | |
8cdc1a81 MD |
2233 | list_for_each_entry(session_priv, &sessions, list) |
2234 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2235 | return 0; |
2236 | } | |
2237 | ||
b01155ba FD |
2238 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2239 | struct lttng_event_notifier_group *event_notifier_group) | |
2240 | { | |
09710b83 | 2241 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2242 | |
09710b83 MD |
2243 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2244 | if (event_enabler->enabled) | |
b01155ba FD |
2245 | return true; |
2246 | } | |
2247 | return false; | |
2248 | } | |
2249 | ||
2250 | bool lttng_event_notifier_active(void) | |
2251 | { | |
2252 | struct lttng_event_notifier_group *event_notifier_group; | |
2253 | ||
2254 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2255 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2256 | return true; | |
2257 | } | |
2258 | return false; | |
2259 | } | |
2260 | ||
2261 | int lttng_fix_pending_event_notifiers(void) | |
2262 | { | |
2263 | struct lttng_event_notifier_group *event_notifier_group; | |
2264 | ||
2265 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2266 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2267 | return 0; | |
2268 | } | |
2269 | ||
1ae083ba | 2270 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2271 | enum lttng_enabler_format_type format_type, |
606828e4 | 2272 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2273 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2274 | { |
1ae083ba | 2275 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2276 | |
b2bc0bc8 FD |
2277 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2278 | if (!event_enabler) | |
3c997079 | 2279 | return NULL; |
0bb716a8 | 2280 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2281 | event_enabler->parent.format_type = format_type; |
2282 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2283 | memcpy(&event_enabler->parent.event_param, event_param, | |
2284 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2285 | event_enabler->chan = chan; |
3c997079 | 2286 | /* ctx left NULL */ |
5b9817ae | 2287 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2288 | return event_enabler; |
2289 | } | |
2290 | ||
2291 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2292 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2293 | { |
3c997079 | 2294 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2295 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2296 | event_enabler->parent.published = true; | |
def1e304 | 2297 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2298 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2299 | } |
2300 | ||
7b25ab0e | 2301 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2302 | { |
2303 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2304 | event_enabler->enabled = 1; |
2305 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2306 | mutex_unlock(&sessions_mutex); |
2307 | return 0; | |
2308 | } | |
2309 | ||
7b25ab0e | 2310 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2311 | { |
2312 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2313 | event_enabler->enabled = 0; |
2314 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2315 | mutex_unlock(&sessions_mutex); |
2316 | return 0; | |
2317 | } | |
2318 | ||
b2bc0bc8 | 2319 | static |
8d554755 | 2320 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2321 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2322 | { |
d64ca521 | 2323 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2324 | uint32_t bytecode_len; |
2325 | int ret; | |
2326 | ||
2327 | ret = get_user(bytecode_len, &bytecode->len); | |
2328 | if (ret) | |
2329 | return ret; | |
52cfcdf3 | 2330 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2331 | GFP_KERNEL); |
2332 | if (!bytecode_node) | |
2333 | return -ENOMEM; | |
2334 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2335 | sizeof(*bytecode) + bytecode_len); | |
2336 | if (ret) | |
2337 | goto error_free; | |
b2bc0bc8 | 2338 | |
8a445457 | 2339 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2340 | bytecode_node->enabler = enabler; |
2341 | /* Enforce length based on allocated size */ | |
2342 | bytecode_node->bc.len = bytecode_len; | |
2343 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2344 | |
07dfc1d0 MD |
2345 | return 0; |
2346 | ||
2347 | error_free: | |
52cfcdf3 | 2348 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2349 | return ret; |
2350 | } | |
2351 | ||
6048044f | 2352 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2353 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2354 | { |
2355 | int ret; | |
6048044f | 2356 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2357 | if (ret) |
2358 | goto error; | |
7b25ab0e | 2359 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2360 | return 0; |
2361 | ||
2362 | error: | |
2363 | return ret; | |
2364 | } | |
2365 | ||
e2d5dbc7 | 2366 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2367 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2368 | { |
2369 | ||
e2d5dbc7 | 2370 | switch (event->priv->instrumentation) { |
606828e4 | 2371 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2372 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2373 | default: |
2374 | return -EINVAL; | |
2375 | } | |
2376 | } | |
2377 | ||
3c997079 | 2378 | static |
8d554755 | 2379 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2380 | { |
d64ca521 | 2381 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2382 | |
2383 | /* Destroy filter bytecode */ | |
2384 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2385 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2386 | lttng_kvfree(filter_node); |
07dfc1d0 | 2387 | } |
b2bc0bc8 FD |
2388 | } |
2389 | ||
44b1abdc | 2390 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2391 | { |
09710b83 MD |
2392 | lttng_enabler_destroy(event_enabler); |
2393 | if (event_enabler->published) | |
2394 | list_del(&event_enabler->node); | |
2395 | ||
44b1abdc MD |
2396 | switch (event_enabler->enabler_type) { |
2397 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2398 | { | |
2399 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2400 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2401 | ||
44b1abdc MD |
2402 | kfree(event_recorder_enabler); |
2403 | break; | |
2404 | } | |
2405 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2406 | { | |
2407 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2408 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2409 | |
44b1abdc MD |
2410 | kfree(event_notifier_enabler); |
2411 | break; | |
2412 | } | |
2413 | default: | |
2414 | WARN_ON_ONCE(1); | |
2415 | } | |
3c997079 MD |
2416 | } |
2417 | ||
dffef45d | 2418 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2419 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2420 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2421 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2422 | { |
2423 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2424 | ||
2425 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2426 | if (!event_notifier_enabler) | |
2427 | return NULL; | |
2428 | ||
0bb716a8 | 2429 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2430 | event_notifier_enabler->parent.format_type = format_type; |
2431 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2432 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2433 | ||
99f52fcc | 2434 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2435 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2436 | |
5b9817ae MD |
2437 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2438 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2439 | |
5b9817ae MD |
2440 | event_notifier_enabler->parent.enabled = 0; |
2441 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2442 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2443 | return event_notifier_enabler; |
2444 | } | |
dffef45d | 2445 | |
1bbb5b2d MD |
2446 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2447 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2448 | { | |
dffef45d | 2449 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2450 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2451 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2452 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2453 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2454 | } |
2455 | ||
2456 | int lttng_event_notifier_enabler_enable( | |
2457 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2458 | { | |
2459 | mutex_lock(&sessions_mutex); | |
2460 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2461 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2462 | mutex_unlock(&sessions_mutex); |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | int lttng_event_notifier_enabler_disable( | |
2467 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2468 | { | |
2469 | mutex_lock(&sessions_mutex); | |
2470 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2471 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2472 | mutex_unlock(&sessions_mutex); |
2473 | return 0; | |
2474 | } | |
2475 | ||
99d223ad FD |
2476 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2477 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2478 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2479 | { |
d64ca521 | 2480 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2481 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2482 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2483 | uint32_t bytecode_len; | |
2484 | int ret; | |
2485 | ||
2486 | ret = get_user(bytecode_len, &bytecode->len); | |
2487 | if (ret) | |
2488 | return ret; | |
2489 | ||
2490 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2491 | GFP_KERNEL); | |
2492 | if (!bytecode_node) | |
2493 | return -ENOMEM; | |
2494 | ||
2495 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2496 | sizeof(*bytecode) + bytecode_len); | |
2497 | if (ret) | |
2498 | goto error_free; | |
2499 | ||
8a445457 | 2500 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2501 | bytecode_node->enabler = enabler; |
2502 | ||
2503 | /* Enforce length based on allocated size */ | |
2504 | bytecode_node->bc.len = bytecode_len; | |
2505 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2506 | ||
2507 | event_notifier_enabler->num_captures++; | |
2508 | ||
2509 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2510 | goto end; | |
2511 | ||
2512 | error_free: | |
2513 | lttng_kvfree(bytecode_node); | |
2514 | end: | |
2515 | return ret; | |
2516 | } | |
2517 | ||
cc5719b1 MD |
2518 | static |
2519 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2520 | { | |
2521 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2522 | struct lttng_kernel_bytecode_runtime *runtime; | |
2523 | struct lttng_enabler_ref *enabler_ref; | |
2524 | ||
2525 | /* Check if has enablers without bytecode enabled */ | |
2526 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2527 | if (enabler_ref->ref->enabled | |
2528 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2529 | has_enablers_without_filter_bytecode = 1; | |
2530 | break; | |
2531 | } | |
2532 | } | |
2533 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2534 | ||
2535 | /* Enable filters */ | |
2536 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2537 | lttng_bytecode_sync_state(runtime); | |
2538 | nr_filters++; | |
2539 | } | |
2540 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2541 | } | |
2542 | ||
2543 | static | |
2544 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2545 | { | |
2546 | switch (event->type) { | |
2547 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2548 | break; | |
2549 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2550 | { | |
2551 | struct lttng_kernel_event_notifier *event_notifier = | |
2552 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2553 | struct lttng_kernel_bytecode_runtime *runtime; | |
2554 | int nr_captures = 0; | |
2555 | ||
2556 | /* Enable captures */ | |
2557 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2558 | lttng_bytecode_sync_state(runtime); | |
2559 | nr_captures++; | |
2560 | } | |
2561 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2562 | break; | |
2563 | } | |
2564 | default: | |
2565 | WARN_ON_ONCE(1); | |
2566 | } | |
2567 | } | |
2568 | ||
a0c6ad2e MD |
2569 | static |
2570 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2571 | { | |
2572 | struct lttng_enabler_ref *enabler_ref; | |
2573 | bool enabled = false; | |
2574 | ||
2575 | switch (event->priv->instrumentation) { | |
2576 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2577 | lttng_fallthrough; | |
2578 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2579 | /* Enable events */ | |
2580 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2581 | if (enabler_ref->ref->enabled) { | |
2582 | enabled = true; | |
2583 | break; | |
2584 | } | |
2585 | } | |
2586 | break; | |
2587 | default: | |
2588 | WARN_ON_ONCE(1); | |
2589 | return false; | |
2590 | } | |
2591 | ||
2592 | switch (event->type) { | |
2593 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2594 | { | |
2595 | struct lttng_kernel_event_recorder *event_recorder = | |
2596 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2597 | ||
2598 | /* | |
2599 | * Enabled state is based on union of enablers, with | |
2600 | * intersection of session and channel transient enable | |
2601 | * states. | |
2602 | */ | |
2603 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2604 | } | |
2605 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2606 | return enabled; | |
2607 | default: | |
2608 | WARN_ON_ONCE(1); | |
2609 | return false; | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | static | |
2614 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2615 | { | |
2616 | switch (event->priv->instrumentation) { | |
2617 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2618 | lttng_fallthrough; | |
2619 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2620 | return true; | |
2621 | ||
2622 | default: | |
2623 | /* Not handled with lazy sync. */ | |
2624 | return false; | |
2625 | } | |
2626 | } | |
2627 | ||
3c997079 | 2628 | /* |
3c997079 MD |
2629 | * Should be called with sessions mutex held. |
2630 | */ | |
2631 | static | |
a0c6ad2e MD |
2632 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2633 | struct list_head *event_list) | |
3c997079 | 2634 | { |
a0c6ad2e | 2635 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2636 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2637 | |
a0c6ad2e | 2638 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2639 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2640 | |
3c997079 MD |
2641 | /* |
2642 | * For each event, if at least one of its enablers is enabled, | |
2643 | * and its channel and session transient states are enabled, we | |
2644 | * enable the event, else we disable it. | |
2645 | */ | |
a0c6ad2e MD |
2646 | list_for_each_entry(event_priv, event_list, node) { |
2647 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2648 | bool enabled; | |
b4a75708 | 2649 | |
a0c6ad2e | 2650 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2651 | continue; |
3c997079 | 2652 | |
a0c6ad2e MD |
2653 | enabled = lttng_get_event_enabled_state(event); |
2654 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2655 | /* |
a0c6ad2e | 2656 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2657 | */ |
2658 | if (enabled) { | |
6a338ba4 MD |
2659 | if (!event_priv->registered) |
2660 | register_event(event); | |
3c997079 | 2661 | } else { |
6a338ba4 MD |
2662 | if (event_priv->registered) |
2663 | unregister_event(event); | |
3c997079 | 2664 | } |
07dfc1d0 | 2665 | |
a0c6ad2e MD |
2666 | lttng_event_sync_filter_state(event); |
2667 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2668 | } |
2669 | } | |
2670 | ||
a0c6ad2e MD |
2671 | /* |
2672 | * lttng_session_sync_event_enablers should be called just before starting a | |
2673 | * session. | |
2674 | */ | |
2675 | static | |
2676 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2677 | { | |
2678 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2679 | } | |
2680 | ||
3c997079 MD |
2681 | /* |
2682 | * Apply enablers to session events, adding events to session if need | |
2683 | * be. It is required after each modification applied to an active | |
2684 | * session, and right before session "start". | |
2685 | * "lazy" sync means we only sync if required. | |
2686 | * Should be called with sessions mutex held. | |
2687 | */ | |
2688 | static | |
8cdc1a81 | 2689 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2690 | { |
2691 | /* We can skip if session is not active */ | |
2692 | if (!session->active) | |
2693 | return; | |
b2bc0bc8 | 2694 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2695 | } |
2696 | ||
b01155ba FD |
2697 | static |
2698 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2699 | { | |
a0c6ad2e | 2700 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2701 | } |
2702 | ||
7b25ab0e MD |
2703 | static |
2704 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2705 | { | |
2706 | switch (event_enabler->enabler_type) { | |
2707 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2708 | { | |
2709 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2710 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2711 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2712 | break; | |
2713 | } | |
2714 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2715 | { | |
2716 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2717 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2718 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2719 | break; | |
2720 | } | |
2721 | default: | |
2722 | WARN_ON_ONCE(1); | |
2723 | } | |
2724 | } | |
2725 | ||
1ec3f75a | 2726 | /* |
d83004aa JD |
2727 | * Serialize at most one packet worth of metadata into a metadata |
2728 | * channel. | |
92d9f5e6 MD |
2729 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2730 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2731 | * allows us to do racy operations such as looking for remaining space left in | |
2732 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2733 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2734 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2735 | * Returns the number of bytes written in the channel, 0 if no data |
2736 | * was written and a negative value on error. | |
1ec3f75a | 2737 | */ |
b3b8072b | 2738 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2739 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2740 | { |
8a57ec02 | 2741 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2742 | int ret = 0; |
2743 | size_t len, reserve_len; | |
2744 | ||
f613e3e6 | 2745 | /* |
92d9f5e6 MD |
2746 | * Ensure we support mutiple get_next / put sequences followed by |
2747 | * put_next. The metadata cache lock protects reading the metadata | |
2748 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2749 | * "flush" operations on the buffer invoked by different processes. | |
2750 | * Moreover, since the metadata cache memory can be reallocated, we | |
2751 | * need to have exclusive access against updates even though we only | |
2752 | * read it. | |
f613e3e6 | 2753 | */ |
92d9f5e6 | 2754 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2755 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2756 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2757 | goto end; |
f613e3e6 | 2758 | |
9616f0bf JD |
2759 | /* Metadata regenerated, change the version. */ |
2760 | if (stream->metadata_cache->version != stream->version) | |
2761 | stream->version = stream->metadata_cache->version; | |
2762 | ||
d83004aa | 2763 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2764 | stream->metadata_in; |
9de2c215 | 2765 | if (!len) |
de23d59d | 2766 | goto end; |
d83004aa | 2767 | reserve_len = min_t(size_t, |
4a399b76 | 2768 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2769 | len); |
a775608d | 2770 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2771 | sizeof(char), NULL); |
d83004aa JD |
2772 | /* |
2773 | * If reservation failed, return an error to the caller. | |
2774 | */ | |
c2fb9c1c | 2775 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2776 | if (ret != 0) { |
2777 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2778 | stream->coherent = false; |
d83004aa JD |
2779 | goto end; |
2780 | } | |
b3b8072b | 2781 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2782 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2783 | reserve_len, 1); |
b3b8072b | 2784 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2785 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2786 | if (reserve_len < len) |
8b97fd42 MD |
2787 | stream->coherent = false; |
2788 | else | |
2789 | stream->coherent = true; | |
d83004aa JD |
2790 | ret = reserve_len; |
2791 | ||
2792 | end: | |
8b97fd42 MD |
2793 | if (coherent) |
2794 | *coherent = stream->coherent; | |
92d9f5e6 | 2795 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2796 | return ret; |
2797 | } | |
2798 | ||
8b97fd42 | 2799 | static |
8cdc1a81 | 2800 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2801 | { |
8cdc1a81 MD |
2802 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2803 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2804 | } |
2805 | ||
2806 | static | |
8cdc1a81 | 2807 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2808 | { |
8cdc1a81 MD |
2809 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2810 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2811 | struct lttng_metadata_stream *stream; |
2812 | ||
8cdc1a81 | 2813 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2814 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2815 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2816 | } |
8b97fd42 MD |
2817 | } |
2818 | ||
d83004aa JD |
2819 | /* |
2820 | * Write the metadata to the metadata cache. | |
2821 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2822 | * The metadata cache lock protects us from concurrent read access from |
2823 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2824 | * The content of the printf is printed as a single atomic metadata |
2825 | * transaction. | |
d83004aa | 2826 | */ |
8cdc1a81 | 2827 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2828 | const char *fmt, ...) |
2829 | { | |
c099397a | 2830 | char *str; |
d83004aa | 2831 | size_t len; |
c099397a MD |
2832 | va_list ap; |
2833 | ||
585e5dcc | 2834 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2835 | |
2836 | va_start(ap, fmt); | |
2837 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2838 | va_end(ap); | |
2839 | if (!str) | |
2840 | return -ENOMEM; | |
2841 | ||
1ec3f75a | 2842 | len = strlen(str); |
8cdc1a81 MD |
2843 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2844 | if (session->priv->metadata_cache->metadata_written + len > | |
2845 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2846 | char *tmp_cache_realloc; |
2847 | unsigned int tmp_cache_alloc_size; | |
2848 | ||
2849 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2850 | session->priv->metadata_cache->cache_alloc + len, |
2851 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2852 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2853 | if (!tmp_cache_realloc) |
2854 | goto err; | |
8cdc1a81 | 2855 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2856 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2857 | session->priv->metadata_cache->data, |
2858 | session->priv->metadata_cache->cache_alloc); | |
2859 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2860 | } |
2861 | ||
8cdc1a81 MD |
2862 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2863 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2864 | } |
8cdc1a81 MD |
2865 | memcpy(session->priv->metadata_cache->data + |
2866 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2867 | str, len); |
8cdc1a81 | 2868 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2869 | kfree(str); |
d83004aa | 2870 | |
d83004aa JD |
2871 | return 0; |
2872 | ||
2873 | err: | |
2874 | kfree(str); | |
2875 | return -ENOMEM; | |
c099397a MD |
2876 | } |
2877 | ||
f513b2bf | 2878 | static |
8cdc1a81 | 2879 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2880 | { |
2881 | size_t i; | |
2882 | ||
2883 | for (i = 0; i < nesting; i++) { | |
2884 | int ret; | |
2885 | ||
2886 | ret = lttng_metadata_printf(session, " "); | |
2887 | if (ret) { | |
2888 | return ret; | |
2889 | } | |
2890 | } | |
2891 | return 0; | |
2892 | } | |
2893 | ||
ceabb767 | 2894 | static |
8cdc1a81 | 2895 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2896 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2897 | size_t nesting) |
2898 | { | |
2899 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2900 | } | |
2901 | ||
2902 | static | |
8cdc1a81 | 2903 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2904 | const struct lttng_kernel_type_integer *type, |
2905 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2906 | size_t nesting) |
2907 | { | |
2908 | int ret; | |
2909 | ||
ceabb767 MD |
2910 | ret = print_tabs(session, nesting); |
2911 | if (ret) | |
2912 | return ret; | |
2913 | ret = lttng_metadata_printf(session, | |
2914 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2915 | type->size, |
2916 | type->alignment, | |
2917 | type->signedness, | |
2918 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2919 | ? "none" |
437d5aa5 | 2920 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2921 | ? "UTF8" |
2922 | : "ASCII", | |
437d5aa5 | 2923 | type->base, |
ceabb767 | 2924 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2925 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2926 | #else |
437d5aa5 | 2927 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2928 | #endif |
2929 | ); | |
2930 | return ret; | |
2931 | } | |
2932 | ||
f513b2bf MD |
2933 | /* |
2934 | * Must be called with sessions_mutex held. | |
2935 | */ | |
2936 | static | |
8cdc1a81 | 2937 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2938 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2939 | size_t nesting) |
2940 | { | |
51ef4536 | 2941 | const char *prev_field_name = NULL; |
f513b2bf MD |
2942 | int ret; |
2943 | uint32_t i, nr_fields; | |
ceabb767 MD |
2944 | unsigned int alignment; |
2945 | ||
f513b2bf MD |
2946 | ret = print_tabs(session, nesting); |
2947 | if (ret) | |
2948 | return ret; | |
2949 | ret = lttng_metadata_printf(session, | |
2950 | "struct {\n"); | |
2951 | if (ret) | |
2952 | return ret; | |
437d5aa5 | 2953 | nr_fields = type->nr_fields; |
f513b2bf | 2954 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2955 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2956 | |
437d5aa5 | 2957 | iter_field = type->fields[i]; |
51ef4536 | 2958 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2959 | if (ret) |
2960 | return ret; | |
2961 | } | |
2962 | ret = print_tabs(session, nesting); | |
2963 | if (ret) | |
2964 | return ret; | |
437d5aa5 | 2965 | alignment = type->alignment; |
ceabb767 MD |
2966 | if (alignment) { |
2967 | ret = lttng_metadata_printf(session, | |
2968 | "} align(%u)", | |
2969 | alignment); | |
2970 | } else { | |
2971 | ret = lttng_metadata_printf(session, | |
2972 | "}"); | |
2973 | } | |
f513b2bf MD |
2974 | return ret; |
2975 | } | |
2976 | ||
2977 | /* | |
2978 | * Must be called with sessions_mutex held. | |
2979 | */ | |
2980 | static | |
8cdc1a81 | 2981 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2982 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2983 | size_t nesting) |
2984 | { | |
2985 | int ret; | |
2986 | ||
2987 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2988 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2989 | if (ret) |
2990 | return ret; | |
ceabb767 | 2991 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2992 | } |
2993 | ||
65c85aa6 MD |
2994 | /* |
2995 | * Must be called with sessions_mutex held. | |
2996 | */ | |
2997 | static | |
8cdc1a81 | 2998 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2999 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3000 | size_t nesting, |
3001 | const char *prev_field_name) | |
65c85aa6 | 3002 | { |
51ef4536 | 3003 | const char *tag_name; |
65c85aa6 MD |
3004 | int ret; |
3005 | uint32_t i, nr_choices; | |
3006 | ||
51ef4536 MD |
3007 | tag_name = type->tag_name; |
3008 | if (!tag_name) | |
3009 | tag_name = prev_field_name; | |
3010 | if (!tag_name) | |
3011 | return -EINVAL; | |
ceabb767 MD |
3012 | /* |
3013 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3014 | */ | |
437d5aa5 | 3015 | if (type->alignment != 0) |
ceabb767 | 3016 | return -EINVAL; |
65c85aa6 MD |
3017 | ret = print_tabs(session, nesting); |
3018 | if (ret) | |
3019 | return ret; | |
3020 | ret = lttng_metadata_printf(session, | |
3021 | "variant <_%s> {\n", | |
51ef4536 | 3022 | tag_name); |
65c85aa6 MD |
3023 | if (ret) |
3024 | return ret; | |
437d5aa5 | 3025 | nr_choices = type->nr_choices; |
65c85aa6 | 3026 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3027 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3028 | |
437d5aa5 | 3029 | iter_field = type->choices[i]; |
51ef4536 | 3030 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3031 | if (ret) |
3032 | return ret; | |
3033 | } | |
3034 | ret = print_tabs(session, nesting); | |
3035 | if (ret) | |
3036 | return ret; | |
3037 | ret = lttng_metadata_printf(session, | |
3038 | "}"); | |
3039 | return ret; | |
3040 | } | |
3041 | ||
3042 | /* | |
3043 | * Must be called with sessions_mutex held. | |
3044 | */ | |
3045 | static | |
8cdc1a81 | 3046 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3047 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3048 | size_t nesting, |
3049 | const char *prev_field_name) | |
65c85aa6 MD |
3050 | { |
3051 | int ret; | |
3052 | ||
3053 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3054 | lttng_kernel_get_type_variant(field->type), nesting, |
3055 | prev_field_name); | |
65c85aa6 MD |
3056 | if (ret) |
3057 | return ret; | |
ceabb767 | 3058 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3059 | } |
3060 | ||
f513b2bf MD |
3061 | /* |
3062 | * Must be called with sessions_mutex held. | |
3063 | */ | |
3064 | static | |
8cdc1a81 | 3065 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3066 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3067 | size_t nesting) |
3068 | { | |
3069 | int ret; | |
437d5aa5 MD |
3070 | const struct lttng_kernel_type_array *array_type; |
3071 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3072 | |
437d5aa5 MD |
3073 | array_type = lttng_kernel_get_type_array(field->type); |
3074 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3075 | |
437d5aa5 | 3076 | if (array_type->alignment) { |
ceabb767 | 3077 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3078 | if (ret) |
3079 | return ret; | |
ceabb767 MD |
3080 | ret = lttng_metadata_printf(session, |
3081 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3082 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3083 | field->name); |
3084 | if (ret) | |
3085 | return ret; | |
3086 | } | |
3087 | /* | |
3088 | * Nested compound types: Only array of structures and variants are | |
3089 | * currently supported. | |
3090 | */ | |
437d5aa5 | 3091 | elem_type = array_type->elem_type; |
12bb2edb MD |
3092 | switch (elem_type->type) { |
3093 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3094 | case lttng_kernel_type_struct: |
3095 | case lttng_kernel_type_variant: | |
3096 | ret = _lttng_type_statedump(session, elem_type, | |
3097 | array_type->encoding, nesting); | |
65c85aa6 MD |
3098 | if (ret) |
3099 | return ret; | |
3100 | break; | |
ceabb767 | 3101 | |
f513b2bf MD |
3102 | default: |
3103 | return -EINVAL; | |
3104 | } | |
3105 | ret = lttng_metadata_printf(session, | |
3106 | " _%s[%u];\n", | |
3107 | field->name, | |
437d5aa5 | 3108 | array_type->length); |
f513b2bf MD |
3109 | return ret; |
3110 | } | |
3111 | ||
3112 | /* | |
3113 | * Must be called with sessions_mutex held. | |
3114 | */ | |
3115 | static | |
8cdc1a81 | 3116 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3117 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3118 | size_t nesting, |
3119 | const char *prev_field_name) | |
f513b2bf MD |
3120 | { |
3121 | int ret; | |
3122 | const char *length_name; | |
437d5aa5 MD |
3123 | const struct lttng_kernel_type_sequence *sequence_type; |
3124 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3125 | |
437d5aa5 MD |
3126 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3127 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3128 | |
437d5aa5 | 3129 | length_name = sequence_type->length_name; |
51ef4536 MD |
3130 | if (!length_name) |
3131 | length_name = prev_field_name; | |
3132 | if (!length_name) | |
3133 | return -EINVAL; | |
ceabb767 | 3134 | |
437d5aa5 | 3135 | if (sequence_type->alignment) { |
ceabb767 | 3136 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3137 | if (ret) |
3138 | return ret; | |
ceabb767 MD |
3139 | ret = lttng_metadata_printf(session, |
3140 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3141 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3142 | field->name); |
3143 | if (ret) | |
3144 | return ret; | |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * Nested compound types: Only array of structures and variants are | |
3149 | * currently supported. | |
3150 | */ | |
437d5aa5 | 3151 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3152 | switch (elem_type->type) { |
3153 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3154 | case lttng_kernel_type_struct: |
3155 | case lttng_kernel_type_variant: | |
3156 | ret = _lttng_type_statedump(session, elem_type, | |
3157 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3158 | if (ret) |
3159 | return ret; | |
3160 | break; | |
ceabb767 | 3161 | |
f513b2bf MD |
3162 | default: |
3163 | return -EINVAL; | |
3164 | } | |
3165 | ret = lttng_metadata_printf(session, | |
3166 | " _%s[ _%s ];\n", | |
3167 | field->name, | |
51ef4536 | 3168 | length_name); |
f513b2bf MD |
3169 | return ret; |
3170 | } | |
3171 | ||
141ddf28 MD |
3172 | /* |
3173 | * Must be called with sessions_mutex held. | |
3174 | */ | |
3175 | static | |
8cdc1a81 | 3176 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3177 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3178 | size_t nesting) |
3179 | { | |
d96a4a7a | 3180 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3181 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3182 | int ret; |
3183 | unsigned int i, nr_entries; | |
3184 | ||
437d5aa5 | 3185 | container_type = type->container_type; |
12bb2edb | 3186 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3187 | ret = -EINVAL; |
3188 | goto end; | |
3189 | } | |
437d5aa5 | 3190 | enum_desc = type->desc; |
141ddf28 MD |
3191 | nr_entries = enum_desc->nr_entries; |
3192 | ||
3193 | ret = print_tabs(session, nesting); | |
3194 | if (ret) | |
3195 | goto end; | |
ceabb767 MD |
3196 | ret = lttng_metadata_printf(session, "enum : "); |
3197 | if (ret) | |
3198 | goto end; | |
437d5aa5 MD |
3199 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3200 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3201 | if (ret) |
ceabb767 MD |
3202 | goto end; |
3203 | ret = lttng_metadata_printf(session, " {\n"); | |
3204 | if (ret) | |
3205 | goto end; | |
141ddf28 MD |
3206 | /* Dump all entries */ |
3207 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3208 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3209 | int j, len; |
3210 | ||
3211 | ret = print_tabs(session, nesting + 1); | |
3212 | if (ret) | |
3213 | goto end; | |
3214 | ret = lttng_metadata_printf(session, | |
3215 | "\""); | |
3216 | if (ret) | |
3217 | goto end; | |
3218 | len = strlen(entry->string); | |
3219 | /* Escape the character '"' */ | |
3220 | for (j = 0; j < len; j++) { | |
3221 | char c = entry->string[j]; | |
3222 | ||
3223 | switch (c) { | |
3224 | case '"': | |
3225 | ret = lttng_metadata_printf(session, | |
3226 | "\\\""); | |
3227 | break; | |
3228 | case '\\': | |
3229 | ret = lttng_metadata_printf(session, | |
3230 | "\\\\"); | |
3231 | break; | |
3232 | default: | |
3233 | ret = lttng_metadata_printf(session, | |
3234 | "%c", c); | |
3235 | break; | |
3236 | } | |
3237 | if (ret) | |
3238 | goto end; | |
3239 | } | |
08ad1061 PP |
3240 | ret = lttng_metadata_printf(session, "\""); |
3241 | if (ret) | |
3242 | goto end; | |
3243 | ||
3244 | if (entry->options.is_auto) { | |
3245 | ret = lttng_metadata_printf(session, ",\n"); | |
3246 | if (ret) | |
3247 | goto end; | |
141ddf28 | 3248 | } else { |
7c559490 MD |
3249 | ret = lttng_metadata_printf(session, |
3250 | " = "); | |
3251 | if (ret) | |
3252 | goto end; | |
3253 | if (entry->start.signedness) | |
141ddf28 | 3254 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3255 | "%lld", (long long) entry->start.value); |
3256 | else | |
3257 | ret = lttng_metadata_printf(session, | |
3258 | "%llu", entry->start.value); | |
3259 | if (ret) | |
3260 | goto end; | |
3261 | if (entry->start.signedness == entry->end.signedness && | |
3262 | entry->start.value | |
3263 | == entry->end.value) { | |
141ddf28 | 3264 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3265 | ",\n"); |
3266 | } else { | |
3267 | if (entry->end.signedness) { | |
3268 | ret = lttng_metadata_printf(session, | |
3269 | " ... %lld,\n", | |
3270 | (long long) entry->end.value); | |
3271 | } else { | |
3272 | ret = lttng_metadata_printf(session, | |
3273 | " ... %llu,\n", | |
3274 | entry->end.value); | |
3275 | } | |
141ddf28 | 3276 | } |
7c559490 MD |
3277 | if (ret) |
3278 | goto end; | |
141ddf28 | 3279 | } |
141ddf28 MD |
3280 | } |
3281 | ret = print_tabs(session, nesting); | |
3282 | if (ret) | |
3283 | goto end; | |
ceabb767 | 3284 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3285 | end: |
3286 | return ret; | |
3287 | } | |
3288 | ||
d83004aa JD |
3289 | /* |
3290 | * Must be called with sessions_mutex held. | |
3291 | */ | |
c099397a | 3292 | static |
8cdc1a81 | 3293 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3294 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3295 | size_t nesting) |
3296 | { | |
3297 | int ret; | |
437d5aa5 | 3298 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3299 | |
437d5aa5 MD |
3300 | enum_type = lttng_kernel_get_type_enum(field->type); |
3301 | WARN_ON_ONCE(!enum_type); | |
3302 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3303 | if (ret) |
3304 | return ret; | |
3305 | return lttng_field_name_statedump(session, field, nesting); | |
3306 | } | |
3307 | ||
3308 | static | |
8cdc1a81 | 3309 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3310 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3311 | size_t nesting) |
3312 | { | |
3313 | int ret; | |
3314 | ||
437d5aa5 MD |
3315 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3316 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3317 | if (ret) |
3318 | return ret; | |
3319 | return lttng_field_name_statedump(session, field, nesting); | |
3320 | } | |
3321 | ||
3322 | static | |
8cdc1a81 | 3323 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3324 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3325 | size_t nesting) |
3326 | { | |
3327 | int ret; | |
3328 | ||
ceabb767 MD |
3329 | /* Default encoding is UTF8 */ |
3330 | ret = print_tabs(session, nesting); | |
3331 | if (ret) | |
3332 | return ret; | |
3333 | ret = lttng_metadata_printf(session, | |
3334 | "string%s", | |
437d5aa5 | 3335 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3336 | " { encoding = ASCII; }" : ""); |
3337 | return ret; | |
3338 | } | |
3339 | ||
3340 | static | |
8cdc1a81 | 3341 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3342 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3343 | size_t nesting) |
ceabb767 | 3344 | { |
437d5aa5 | 3345 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3346 | int ret; |
3347 | ||
437d5aa5 MD |
3348 | string_type = lttng_kernel_get_type_string(field->type); |
3349 | WARN_ON_ONCE(!string_type); | |
3350 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3351 | if (ret) |
3352 | return ret; | |
3353 | return lttng_field_name_statedump(session, field, nesting); | |
3354 | } | |
3355 | ||
3356 | /* | |
3357 | * Must be called with sessions_mutex held. | |
3358 | */ | |
3359 | static | |
8cdc1a81 | 3360 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3361 | const struct lttng_kernel_type_common *type, |
3362 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3363 | size_t nesting) |
c099397a | 3364 | { |
c099397a | 3365 | int ret = 0; |
c099397a | 3366 | |
12bb2edb MD |
3367 | switch (type->type) { |
3368 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3369 | ret = _lttng_integer_type_statedump(session, |
3370 | lttng_kernel_get_type_integer(type), | |
3371 | parent_encoding, nesting); | |
8070f5c0 | 3372 | break; |
437d5aa5 MD |
3373 | case lttng_kernel_type_enum: |
3374 | ret = _lttng_enum_type_statedump(session, | |
3375 | lttng_kernel_get_type_enum(type), | |
3376 | nesting); | |
8070f5c0 | 3377 | break; |
12bb2edb | 3378 | case lttng_kernel_type_string: |
437d5aa5 MD |
3379 | ret = _lttng_string_type_statedump(session, |
3380 | lttng_kernel_get_type_string(type), | |
3381 | nesting); | |
ceabb767 | 3382 | break; |
437d5aa5 MD |
3383 | case lttng_kernel_type_struct: |
3384 | ret = _lttng_struct_type_statedump(session, | |
3385 | lttng_kernel_get_type_struct(type), | |
3386 | nesting); | |
8070f5c0 | 3387 | break; |
437d5aa5 MD |
3388 | case lttng_kernel_type_variant: |
3389 | ret = _lttng_variant_type_statedump(session, | |
3390 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3391 | nesting, NULL); |
ceabb767 MD |
3392 | break; |
3393 | ||
3394 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3395 | case lttng_kernel_type_array: |
3396 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3397 | default: |
3398 | WARN_ON_ONCE(1); | |
3399 | return -EINVAL; | |
8070f5c0 | 3400 | } |
ceabb767 MD |
3401 | return ret; |
3402 | } | |
8070f5c0 | 3403 | |
ceabb767 MD |
3404 | /* |
3405 | * Must be called with sessions_mutex held. | |
3406 | */ | |
3407 | static | |
8cdc1a81 | 3408 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3409 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3410 | size_t nesting, |
3411 | const char **prev_field_name_p) | |
ceabb767 | 3412 | { |
51ef4536 | 3413 | const char *prev_field_name = NULL; |
ceabb767 | 3414 | int ret = 0; |
27d2368e | 3415 | |
51ef4536 MD |
3416 | if (prev_field_name_p) |
3417 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3418 | switch (field->type->type) { |
12bb2edb | 3419 | case lttng_kernel_type_integer: |
ceabb767 MD |
3420 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3421 | break; | |
437d5aa5 | 3422 | case lttng_kernel_type_enum: |
ceabb767 | 3423 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3424 | break; |
12bb2edb | 3425 | case lttng_kernel_type_string: |
ceabb767 | 3426 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3427 | break; |
437d5aa5 | 3428 | case lttng_kernel_type_struct: |
ceabb767 | 3429 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3430 | break; |
437d5aa5 | 3431 | case lttng_kernel_type_array: |
ceabb767 | 3432 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3433 | break; |
437d5aa5 | 3434 | case lttng_kernel_type_sequence: |
51ef4536 | 3435 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3436 | break; |
437d5aa5 | 3437 | case lttng_kernel_type_variant: |
51ef4536 | 3438 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3439 | break; |
f513b2bf | 3440 | |
8070f5c0 MD |
3441 | default: |
3442 | WARN_ON_ONCE(1); | |
3443 | return -EINVAL; | |
3444 | } | |
51ef4536 MD |
3445 | if (prev_field_name_p) |
3446 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3447 | return ret; |
3448 | } | |
3449 | ||
3450 | static | |
8cdc1a81 | 3451 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3452 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3453 | { |
51ef4536 | 3454 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3455 | int ret = 0; |
3456 | int i; | |
3457 | ||
3458 | if (!ctx) | |
3459 | return 0; | |
3460 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3461 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3462 | |
51ef4536 | 3463 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3464 | if (ret) |
3465 | return ret; | |
3466 | } | |
3467 | return ret; | |
3468 | } | |
3469 | ||
3470 | static | |
8cdc1a81 | 3471 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3472 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3473 | { |
51ef4536 | 3474 | const char *prev_field_name = NULL; |
a67ba386 | 3475 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3476 | int ret = 0; |
3477 | int i; | |
3478 | ||
6c8c025b MD |
3479 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3480 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3481 | |
51ef4536 | 3482 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3483 | if (ret) |
3484 | return ret; | |
c099397a MD |
3485 | } |
3486 | return ret; | |
3487 | } | |
3488 | ||
d83004aa JD |
3489 | /* |
3490 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3491 | * The entire event metadata is printed as a single atomic metadata |
3492 | * transaction. | |
d83004aa | 3493 | */ |
c099397a | 3494 | static |
ee7e9a18 | 3495 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3496 | { |
ee7e9a18 MD |
3497 | struct lttng_kernel_event_recorder *event_recorder; |
3498 | struct lttng_kernel_channel_buffer *chan; | |
3499 | struct lttng_kernel_session *session; | |
c099397a MD |
3500 | int ret = 0; |
3501 | ||
ee7e9a18 MD |
3502 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3503 | return 0; | |
3504 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3505 | chan = event_recorder->chan; | |
3506 | session = chan->parent.session; | |
3507 | ||
a67ba386 | 3508 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3509 | return 0; |
f7d06400 | 3510 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3511 | return 0; |
3512 | ||
8b97fd42 MD |
3513 | lttng_metadata_begin(session); |
3514 | ||
c099397a MD |
3515 | ret = lttng_metadata_printf(session, |
3516 | "event {\n" | |
ae734547 | 3517 | " name = \"%s\";\n" |
c099397a | 3518 | " id = %u;\n" |
b9074a1b | 3519 | " stream_id = %u;\n", |
a67ba386 MD |
3520 | event_recorder->priv->parent.desc->event_name, |
3521 | event_recorder->priv->id, | |
f7d06400 | 3522 | event_recorder->chan->priv->id); |
c099397a MD |
3523 | if (ret) |
3524 | goto end; | |
3525 | ||
8070f5c0 | 3526 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3527 | " fields := struct {\n" |
3528 | ); | |
3529 | if (ret) | |
3530 | goto end; | |
3531 | ||
a67ba386 | 3532 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3533 | if (ret) |
3534 | goto end; | |
3535 | ||
3536 | /* | |
3537 | * LTTng space reservation can only reserve multiples of the | |
3538 | * byte size. | |
3539 | */ | |
3540 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3541 | " };\n" |
3542 | "};\n\n"); | |
c099397a MD |
3543 | if (ret) |
3544 | goto end; | |
3545 | ||
a67ba386 | 3546 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3547 | end: |
8b97fd42 | 3548 | lttng_metadata_end(session); |
c099397a MD |
3549 | return ret; |
3550 | ||
3551 | } | |
3552 | ||
d83004aa JD |
3553 | /* |
3554 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3555 | * The entire channel metadata is printed as a single atomic metadata |
3556 | * transaction. | |
d83004aa | 3557 | */ |
c099397a | 3558 | static |
8cdc1a81 | 3559 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3560 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3561 | { |
3562 | int ret = 0; | |
3563 | ||
f7d06400 | 3564 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3565 | return 0; |
d83004aa | 3566 | |
f7d06400 | 3567 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3568 | return 0; |
3569 | ||
8b97fd42 MD |
3570 | lttng_metadata_begin(session); |
3571 | ||
f7d06400 | 3572 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3573 | ret = lttng_metadata_printf(session, |
3574 | "stream {\n" | |
3575 | " id = %u;\n" | |
9115fbdc | 3576 | " event.header := %s;\n" |
b9074a1b | 3577 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3578 | chan->priv->id, |
3579 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3580 | "struct event_header_large"); |
3581 | if (ret) | |
3582 | goto end; | |
3583 | ||
f7d06400 | 3584 | if (chan->priv->ctx) { |
b9074a1b MD |
3585 | ret = lttng_metadata_printf(session, |
3586 | " event.context := struct {\n"); | |
3587 | if (ret) | |
3588 | goto end; | |
3589 | } | |
f7d06400 | 3590 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3591 | if (ret) |
3592 | goto end; | |
f7d06400 | 3593 | if (chan->priv->ctx) { |
b9074a1b MD |
3594 | ret = lttng_metadata_printf(session, |
3595 | " };\n"); | |
3596 | if (ret) | |
3597 | goto end; | |
3598 | } | |
8070f5c0 MD |
3599 | |
3600 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3601 | "};\n\n"); |
8070f5c0 | 3602 | |
f7d06400 | 3603 | chan->priv->metadata_dumped = 1; |
c099397a | 3604 | end: |
8b97fd42 | 3605 | lttng_metadata_end(session); |
c099397a MD |
3606 | return ret; |
3607 | } | |
3608 | ||
d83004aa JD |
3609 | /* |
3610 | * Must be called with sessions_mutex held. | |
3611 | */ | |
9115fbdc | 3612 | static |
8cdc1a81 | 3613 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3614 | { |
3615 | return lttng_metadata_printf(session, | |
3616 | "struct packet_context {\n" | |
a3ccff4f MD |
3617 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3618 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3619 | " uint64_t content_size;\n" |
3620 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3621 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3622 | " unsigned long events_discarded;\n" |
9115fbdc | 3623 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3624 | "};\n\n" |
9115fbdc MD |
3625 | ); |
3626 | } | |
3627 | ||
3628 | /* | |
3629 | * Compact header: | |
3630 | * id: range: 0 - 30. | |
3631 | * id 31 is reserved to indicate an extended header. | |
3632 | * | |
3633 | * Large header: | |
3634 | * id: range: 0 - 65534. | |
3635 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3636 | * |
3637 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3638 | */ |
3639 | static | |
8cdc1a81 | 3640 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3641 | { |
3642 | return lttng_metadata_printf(session, | |
3643 | "struct event_header_compact {\n" | |
3644 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3645 | " variant <id> {\n" | |
3646 | " struct {\n" | |
a3ccff4f | 3647 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3648 | " } compact;\n" |
3649 | " struct {\n" | |
3650 | " uint32_t id;\n" | |
a3ccff4f | 3651 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3652 | " } extended;\n" |
3653 | " } v;\n" | |
3654 | "} align(%u);\n" | |
3655 | "\n" | |
3656 | "struct event_header_large {\n" | |
3657 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3658 | " variant <id> {\n" | |
3659 | " struct {\n" | |
a3ccff4f | 3660 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3661 | " } compact;\n" |
3662 | " struct {\n" | |
3663 | " uint32_t id;\n" | |
a3ccff4f | 3664 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3665 | " } extended;\n" |
3666 | " } v;\n" | |
3667 | "} align(%u);\n\n", | |
a90917c3 MD |
3668 | lttng_alignof(uint32_t) * CHAR_BIT, |
3669 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3670 | ); |
3671 | } | |
3672 | ||
a3ccff4f MD |
3673 | /* |
3674 | * Approximation of NTP time of day to clock monotonic correlation, | |
3675 | * taken at start of trace. | |
3676 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3677 | * in future versions. | |
5283350b MD |
3678 | * This function may return a negative offset. It may happen if the |
3679 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3680 | * |
3681 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3682 | * y2038 compliant. | |
a3ccff4f MD |
3683 | */ |
3684 | static | |
8967b2a3 | 3685 | int64_t measure_clock_offset(void) |
a3ccff4f | 3686 | { |
dcb93448 | 3687 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3688 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3689 | int64_t offset; |
a3ccff4f | 3690 | unsigned long flags; |
3636085f MJ |
3691 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3692 | struct timespec64 rts = { 0, 0 }; | |
3693 | #else | |
3694 | struct timespec rts = { 0, 0 }; | |
3695 | #endif | |
a3ccff4f MD |
3696 | |
3697 | /* Disable interrupts to increase correlation precision. */ | |
3698 | local_irq_save(flags); | |
3699 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3700 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3701 | ktime_get_real_ts64(&rts); | |
3702 | #else | |
216b6baa | 3703 | getnstimeofday(&rts); |
3636085f | 3704 | #endif |
a3ccff4f MD |
3705 | monotonic[1] = trace_clock_read64(); |
3706 | local_irq_restore(flags); | |
3707 | ||
dcb93448 | 3708 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3709 | realtime = (uint64_t) rts.tv_sec * tcf; |
3710 | if (tcf == NSEC_PER_SEC) { | |
3711 | realtime += rts.tv_nsec; | |
3712 | } else { | |
3713 | uint64_t n = rts.tv_nsec * tcf; | |
3714 | ||
3715 | do_div(n, NSEC_PER_SEC); | |
3716 | realtime += n; | |
3717 | } | |
dcb93448 | 3718 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3719 | return offset; |
3720 | } | |
3721 | ||
3eb95be4 | 3722 | static |
8cdc1a81 | 3723 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3724 | { |
0f3eaad4 | 3725 | int ret = 0; |
3eb95be4 JR |
3726 | size_t i; |
3727 | char cur; | |
3728 | ||
3729 | i = 0; | |
3730 | cur = string[i]; | |
3731 | while (cur != '\0') { | |
3732 | switch (cur) { | |
3733 | case '\n': | |
3734 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3735 | break; | |
3736 | case '\\': | |
3737 | case '"': | |
3738 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3739 | if (ret) | |
3740 | goto error; | |
3741 | /* We still print the current char */ | |
c190d76e | 3742 | lttng_fallthrough; |
3eb95be4 JR |
3743 | default: |
3744 | ret = lttng_metadata_printf(session, "%c", cur); | |
3745 | break; | |
3746 | } | |
3747 | ||
3748 | if (ret) | |
3749 | goto error; | |
3750 | ||
3751 | cur = string[++i]; | |
3752 | } | |
3753 | error: | |
3754 | return ret; | |
3755 | } | |
3756 | ||
3757 | static | |
8cdc1a81 | 3758 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3759 | const char *field_value) |
3eb95be4 JR |
3760 | { |
3761 | int ret; | |
3762 | ||
1c88f269 | 3763 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3764 | if (ret) |
3765 | goto error; | |
3766 | ||
1c88f269 | 3767 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3768 | if (ret) |
3769 | goto error; | |
3770 | ||
3771 | ret = lttng_metadata_printf(session, "\";\n"); | |
3772 | ||
3773 | error: | |
3774 | return ret; | |
3775 | } | |
3776 | ||
c099397a MD |
3777 | /* |
3778 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3779 | * Must be called with sessions_mutex held. |
c099397a MD |
3780 | */ |
3781 | static | |
8cdc1a81 | 3782 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3783 | { |
8cdc1a81 | 3784 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3785 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3786 | const char *product_uuid; |
f7d06400 | 3787 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3788 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3789 | int ret = 0; |
3790 | ||
585e5dcc | 3791 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3792 | return 0; |
8b97fd42 MD |
3793 | |
3794 | lttng_metadata_begin(session); | |
3795 | ||
8cdc1a81 | 3796 | if (session->priv->metadata_dumped) |
c099397a | 3797 | goto skip_session; |
c099397a | 3798 | |
d793d5e1 | 3799 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3800 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3801 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3802 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3803 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3804 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3805 | |
3806 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3807 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3808 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3809 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3810 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3811 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3812 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3813 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3814 | "\n" |
3815 | "trace {\n" | |
3816 | " major = %u;\n" | |
3817 | " minor = %u;\n" | |
30bdb6e4 | 3818 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3819 | " byte_order = %s;\n" |
3820 | " packet.header := struct {\n" | |
3821 | " uint32_t magic;\n" | |
1ec3f75a | 3822 | " uint8_t uuid[16];\n" |
d793d5e1 | 3823 | " uint32_t stream_id;\n" |
5594698f | 3824 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3825 | " };\n" |
d793d5e1 | 3826 | "};\n\n", |
a90917c3 MD |
3827 | lttng_alignof(uint8_t) * CHAR_BIT, |
3828 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3829 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3830 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3831 | sizeof(unsigned long) * CHAR_BIT, |
3832 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3833 | CTF_SPEC_MAJOR, |
3834 | CTF_SPEC_MINOR, | |
d793d5e1 | 3835 | uuid_s, |
5214fa50 | 3836 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3837 | "be" |
3838 | #else | |
3839 | "le" | |
3840 | #endif | |
3841 | ); | |
3842 | if (ret) | |
3843 | goto end; | |
3844 | ||
99dc9597 MD |
3845 | ret = lttng_metadata_printf(session, |
3846 | "env {\n" | |
a6058143 | 3847 | " hostname = \"%s\";\n" |
c6c9e10f | 3848 | " domain = \"kernel\";\n" |
99dc9597 | 3849 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3850 | " kernel_release = \"%s\";\n" |
3851 | " kernel_version = \"%s\";\n" | |
3852 | " tracer_name = \"lttng-modules\";\n" | |
3853 | " tracer_major = %d;\n" | |
3854 | " tracer_minor = %d;\n" | |
3855 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3856 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3857 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3858 | utsname()->sysname, |
3859 | utsname()->release, | |
c6c9e10f MD |
3860 | utsname()->version, |
3861 | LTTNG_MODULES_MAJOR_VERSION, | |
3862 | LTTNG_MODULES_MINOR_VERSION, | |
3863 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3864 | ); |
3865 | if (ret) | |
3866 | goto end; | |
3867 | ||
8cdc1a81 | 3868 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3869 | if (ret) |
3870 | goto end; | |
3871 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3872 | session->priv->creation_time); |
3eb95be4 JR |
3873 | if (ret) |
3874 | goto end; | |
3875 | ||
c88f762e GB |
3876 | /* Add the product UUID to the 'env' section */ |
3877 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3878 | if (product_uuid) { | |
3879 | ret = lttng_metadata_printf(session, | |
3880 | " product_uuid = \"%s\";\n", | |
3881 | product_uuid | |
3882 | ); | |
3883 | if (ret) | |
3884 | goto end; | |
3885 | } | |
3886 | ||
3887 | /* Close the 'env' section */ | |
3eb95be4 JR |
3888 | ret = lttng_metadata_printf(session, "};\n\n"); |
3889 | if (ret) | |
3890 | goto end; | |
3891 | ||
a3ccff4f MD |
3892 | ret = lttng_metadata_printf(session, |
3893 | "clock {\n" | |
2754583e MD |
3894 | " name = \"%s\";\n", |
3895 | trace_clock_name() | |
a82c63f1 MD |
3896 | ); |
3897 | if (ret) | |
3898 | goto end; | |
3899 | ||
3900 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3901 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3902 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3903 | clock_uuid_s |
3904 | ); | |
3905 | if (ret) | |
3906 | goto end; | |
3907 | } | |
3908 | ||
3909 | ret = lttng_metadata_printf(session, | |
2754583e | 3910 | " description = \"%s\";\n" |
a3ccff4f MD |
3911 | " freq = %llu; /* Frequency, in Hz */\n" |
3912 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3913 | " offset = %lld;\n" |
a3ccff4f | 3914 | "};\n\n", |
2754583e | 3915 | trace_clock_description(), |
a3ccff4f | 3916 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3917 | (long long) measure_clock_offset() |
a3ccff4f MD |
3918 | ); |
3919 | if (ret) | |
3920 | goto end; | |
3921 | ||
3922 | ret = lttng_metadata_printf(session, | |
3923 | "typealias integer {\n" | |
3924 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3925 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3926 | "} := uint27_clock_monotonic_t;\n" |
3927 | "\n" | |
3928 | "typealias integer {\n" | |
3929 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3930 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3931 | "} := uint32_clock_monotonic_t;\n" |
3932 | "\n" | |
3933 | "typealias integer {\n" | |
3934 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3935 | " map = clock.%s.value;\n" |
a3ccff4f | 3936 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3937 | trace_clock_name(), |
a3ccff4f | 3938 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3939 | trace_clock_name(), |
3940 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3941 | trace_clock_name() | |
a3ccff4f MD |
3942 | ); |
3943 | if (ret) | |
3944 | goto end; | |
3945 | ||
a90917c3 | 3946 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3947 | if (ret) |
3948 | goto end; | |
3949 | ||
a90917c3 | 3950 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3951 | if (ret) |
3952 | goto end; | |
3953 | ||
c099397a | 3954 | skip_session: |
f7d06400 MD |
3955 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3956 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3957 | if (ret) |
3958 | goto end; | |
3959 | } | |
3960 | ||
f237aef8 | 3961 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3962 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3963 | if (ret) |
3964 | goto end; | |
3965 | } | |
8cdc1a81 | 3966 | session->priv->metadata_dumped = 1; |
c099397a | 3967 | end: |
8b97fd42 | 3968 | lttng_metadata_end(session); |
c099397a MD |
3969 | return ret; |
3970 | } | |
3971 | ||
c0e31d2e | 3972 | /** |
a90917c3 | 3973 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3974 | * @transport: transport structure |
3975 | * | |
3976 | * Registers a transport which can be used as output to extract the data out of | |
3977 | * LTTng. The module calling this registration function must ensure that no | |
3978 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3979 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3980 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3981 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3982 | * after its registration must it synchronize the TLBs. |
3983 | */ | |
a90917c3 | 3984 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3985 | { |
3986 | /* | |
3987 | * Make sure no page fault can be triggered by the module about to be | |
3988 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3989 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3990 | */ |
263b6c88 | 3991 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3992 | |
3993 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3994 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3995 | mutex_unlock(&sessions_mutex); |
3996 | } | |
a90917c3 | 3997 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3998 | |
3999 | /** | |
a90917c3 | 4000 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4001 | * @transport: transport structure |
4002 | */ | |
a90917c3 | 4003 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4004 | { |
4005 | mutex_lock(&sessions_mutex); | |
4006 | list_del(&transport->node); | |
4007 | mutex_unlock(&sessions_mutex); | |
4008 | } | |
a90917c3 | 4009 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4010 | |
a101fa10 MD |
4011 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4012 | { | |
4013 | /* | |
4014 | * Make sure no page fault can be triggered by the module about to be | |
4015 | * registered. We deal with this here so we don't have to call | |
4016 | * vmalloc_sync_mappings() in each module's init. | |
4017 | */ | |
4018 | wrapper_vmalloc_sync_mappings(); | |
4019 | ||
4020 | mutex_lock(&sessions_mutex); | |
4021 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4022 | mutex_unlock(&sessions_mutex); | |
4023 | } | |
4024 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4025 | ||
4026 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4027 | { | |
4028 | mutex_lock(&sessions_mutex); | |
4029 | list_del(&transport->node); | |
4030 | mutex_unlock(&sessions_mutex); | |
4031 | } | |
4032 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4033 | ||
5f4c791e | 4034 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4035 | |
4036 | enum cpuhp_state lttng_hp_prepare; | |
4037 | enum cpuhp_state lttng_hp_online; | |
4038 | ||
4039 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4040 | { | |
4041 | struct lttng_cpuhp_node *lttng_node; | |
4042 | ||
4043 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4044 | switch (lttng_node->component) { | |
4045 | case LTTNG_RING_BUFFER_FRONTEND: | |
4046 | return 0; | |
4047 | case LTTNG_RING_BUFFER_BACKEND: | |
4048 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4049 | case LTTNG_RING_BUFFER_ITER: | |
4050 | return 0; | |
4051 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4052 | return 0; | |
4053 | default: | |
4054 | return -EINVAL; | |
4055 | } | |
4056 | } | |
4057 | ||
4058 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4059 | { | |
4060 | struct lttng_cpuhp_node *lttng_node; | |
4061 | ||
4062 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4063 | switch (lttng_node->component) { | |
4064 | case LTTNG_RING_BUFFER_FRONTEND: | |
4065 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4066 | case LTTNG_RING_BUFFER_BACKEND: | |
4067 | return 0; | |
4068 | case LTTNG_RING_BUFFER_ITER: | |
4069 | return 0; | |
4070 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4071 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4072 | default: | |
4073 | return -EINVAL; | |
4074 | } | |
4075 | } | |
4076 | ||
4077 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4078 | { | |
4079 | struct lttng_cpuhp_node *lttng_node; | |
4080 | ||
4081 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4082 | switch (lttng_node->component) { | |
4083 | case LTTNG_RING_BUFFER_FRONTEND: | |
4084 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4085 | case LTTNG_RING_BUFFER_BACKEND: | |
4086 | return 0; | |
4087 | case LTTNG_RING_BUFFER_ITER: | |
4088 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4089 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4090 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4091 | default: | |
4092 | return -EINVAL; | |
4093 | } | |
4094 | } | |
4095 | ||
4096 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4097 | { | |
4098 | struct lttng_cpuhp_node *lttng_node; | |
4099 | ||
4100 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4101 | switch (lttng_node->component) { | |
4102 | case LTTNG_RING_BUFFER_FRONTEND: | |
4103 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4104 | case LTTNG_RING_BUFFER_BACKEND: | |
4105 | return 0; | |
4106 | case LTTNG_RING_BUFFER_ITER: | |
4107 | return 0; | |
4108 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4109 | return 0; | |
4110 | default: | |
4111 | return -EINVAL; | |
4112 | } | |
4113 | } | |
4114 | ||
4115 | static int __init lttng_init_cpu_hotplug(void) | |
4116 | { | |
4117 | int ret; | |
4118 | ||
4119 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4120 | lttng_hotplug_prepare, | |
4121 | lttng_hotplug_dead); | |
4122 | if (ret < 0) { | |
4123 | return ret; | |
4124 | } | |
4125 | lttng_hp_prepare = ret; | |
4126 | lttng_rb_set_hp_prepare(ret); | |
4127 | ||
4128 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4129 | lttng_hotplug_online, | |
4130 | lttng_hotplug_offline); | |
4131 | if (ret < 0) { | |
4132 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4133 | lttng_hp_prepare = 0; | |
4134 | return ret; | |
4135 | } | |
4136 | lttng_hp_online = ret; | |
4137 | lttng_rb_set_hp_online(ret); | |
4138 | ||
4139 | return 0; | |
4140 | } | |
4141 | ||
4142 | static void __exit lttng_exit_cpu_hotplug(void) | |
4143 | { | |
4144 | lttng_rb_set_hp_online(0); | |
4145 | cpuhp_remove_multi_state(lttng_hp_online); | |
4146 | lttng_rb_set_hp_prepare(0); | |
4147 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4148 | } | |
4149 | ||
5f4c791e | 4150 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4151 | static int lttng_init_cpu_hotplug(void) |
4152 | { | |
4153 | return 0; | |
4154 | } | |
4155 | static void lttng_exit_cpu_hotplug(void) | |
4156 | { | |
4157 | } | |
5f4c791e | 4158 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4159 | |
a90917c3 | 4160 | static int __init lttng_events_init(void) |
4e3c1b9b | 4161 | { |
1c25284c MD |
4162 | int ret; |
4163 | ||
453b2495 JD |
4164 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4165 | if (ret) | |
4166 | return ret; | |
389d7070 | 4167 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4168 | if (ret) |
4169 | return ret; | |
4170 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4171 | if (ret) |
4172 | return ret; | |
4173 | ret = lttng_probes_init(); | |
389d7070 MD |
4174 | if (ret) |
4175 | return ret; | |
07dfc1d0 | 4176 | ret = lttng_context_init(); |
20591cf7 MD |
4177 | if (ret) |
4178 | return ret; | |
07dfc1d0 MD |
4179 | ret = lttng_tracepoint_init(); |
4180 | if (ret) | |
4181 | goto error_tp; | |
a67ba386 MD |
4182 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4183 | if (!event_recorder_cache) { | |
20591cf7 | 4184 | ret = -ENOMEM; |
a67ba386 | 4185 | goto error_kmem_event_recorder; |
dffef45d | 4186 | } |
a67ba386 MD |
4187 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4188 | if (!event_recorder_private_cache) { | |
4189 | ret = -ENOMEM; | |
4190 | goto error_kmem_event_recorder_private; | |
4191 | } | |
4192 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4193 | if (!event_notifier_cache) { |
4194 | ret = -ENOMEM; | |
4195 | goto error_kmem_event_notifier; | |
20591cf7 | 4196 | } |
a67ba386 MD |
4197 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4198 | if (!event_notifier_private_cache) { | |
4199 | ret = -ENOMEM; | |
4200 | goto error_kmem_event_notifier_private; | |
4201 | } | |
80996790 | 4202 | ret = lttng_abi_init(); |
02119ee5 MD |
4203 | if (ret) |
4204 | goto error_abi; | |
0c956676 MD |
4205 | ret = lttng_logger_init(); |
4206 | if (ret) | |
4207 | goto error_logger; | |
1e367326 MD |
4208 | ret = lttng_init_cpu_hotplug(); |
4209 | if (ret) | |
4210 | goto error_hotplug; | |
101215b7 | 4211 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4212 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4213 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4214 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4215 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4216 | LTTNG_VERSION_NAME, |
4217 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4218 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4219 | #else | |
4220 | "", | |
4221 | #endif | |
4222 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4223 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4224 | #else | |
4225 | ""); | |
4226 | #endif | |
c1551e57 MJ |
4227 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4228 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4229 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4230 | return 0; |
0c956676 | 4231 | |
1e367326 MD |
4232 | error_hotplug: |
4233 | lttng_logger_exit(); | |
0c956676 MD |
4234 | error_logger: |
4235 | lttng_abi_exit(); | |
02119ee5 | 4236 | error_abi: |
a67ba386 MD |
4237 | kmem_cache_destroy(event_notifier_private_cache); |
4238 | error_kmem_event_notifier_private: | |
dffef45d FD |
4239 | kmem_cache_destroy(event_notifier_cache); |
4240 | error_kmem_event_notifier: | |
a67ba386 MD |
4241 | kmem_cache_destroy(event_recorder_private_cache); |
4242 | error_kmem_event_recorder_private: | |
4243 | kmem_cache_destroy(event_recorder_cache); | |
4244 | error_kmem_event_recorder: | |
20591cf7 | 4245 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4246 | error_tp: |
4247 | lttng_context_exit(); | |
101215b7 | 4248 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4249 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4250 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4251 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4252 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4253 | LTTNG_VERSION_NAME, |
4254 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4255 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4256 | #else | |
4257 | "", | |
4258 | #endif | |
4259 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4260 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4261 | #else | |
4262 | ""); | |
4263 | #endif | |
1c25284c | 4264 | return ret; |
4e3c1b9b MD |
4265 | } |
4266 | ||
a90917c3 | 4267 | module_init(lttng_events_init); |
11b5a3c2 | 4268 | |
a90917c3 | 4269 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4270 | { |
8cdc1a81 | 4271 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4272 | |
1e367326 | 4273 | lttng_exit_cpu_hotplug(); |
0c956676 | 4274 | lttng_logger_exit(); |
80996790 | 4275 | lttng_abi_exit(); |
8cdc1a81 MD |
4276 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4277 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4278 | kmem_cache_destroy(event_recorder_cache); |
4279 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4280 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4281 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4282 | lttng_tracepoint_exit(); |
07dfc1d0 | 4283 | lttng_context_exit(); |
101215b7 | 4284 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4285 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4286 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4287 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4288 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4289 | LTTNG_VERSION_NAME, |
4290 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4291 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4292 | #else | |
4293 | "", | |
4294 | #endif | |
4295 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4296 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4297 | #else | |
4298 | ""); | |
4299 | #endif | |
4e3c1b9b | 4300 | } |
92e94819 | 4301 | |
a90917c3 | 4302 | module_exit(lttng_events_exit); |
11b5a3c2 | 4303 | |
7ca11e77 | 4304 | #include <generated/patches.h> |
101215b7 MJ |
4305 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4306 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4307 | #endif | |
4308 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4309 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4310 | #endif | |
92e94819 MD |
4311 | MODULE_LICENSE("GPL and additional rights"); |
4312 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4313 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4314 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4315 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4316 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4317 | LTTNG_MODULES_EXTRAVERSION); |