Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
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> | |
4e3c1b9b | 49 | |
5987e66c MJ |
50 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) |
51 | #include <linux/stdarg.h> | |
52 | #else | |
53 | #include <stdarg.h> | |
54 | #endif | |
55 | ||
d83004aa JD |
56 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
57 | ||
4e3c1b9b | 58 | static LIST_HEAD(sessions); |
750b05f2 | 59 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 60 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 61 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
62 | /* |
63 | * Protect the sessions and metadata caches. | |
64 | */ | |
4e3c1b9b | 65 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
66 | static struct kmem_cache *event_recorder_cache; |
67 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 68 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 69 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 70 | |
8cdc1a81 MD |
71 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
72 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 73 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 74 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 75 | |
0648898e | 76 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 77 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
6a338ba4 | 78 | static void _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 79 | static |
ee7e9a18 | 80 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 81 | static |
8cdc1a81 | 82 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
83 | static |
84 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 85 | static |
8cdc1a81 | 86 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
87 | const struct lttng_kernel_type_common *type, |
88 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
89 | size_t nesting); |
90 | static | |
8cdc1a81 | 91 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 92 | const struct lttng_kernel_event_field *field, |
51ef4536 | 93 | size_t nesting, const char **prev_field_name_p); |
c099397a | 94 | |
c099397a | 95 | void synchronize_trace(void) |
abcca994 | 96 | { |
05355f0b MJ |
97 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
98 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
99 | synchronize_rcu(); |
100 | #else | |
abcca994 | 101 | synchronize_sched(); |
92da05ce MJ |
102 | #endif |
103 | ||
b8590f40 MD |
104 | #ifdef CONFIG_PREEMPT_RT_FULL |
105 | synchronize_rcu(); | |
106 | #endif | |
abcca994 MD |
107 | } |
108 | ||
3c997079 MD |
109 | void lttng_lock_sessions(void) |
110 | { | |
111 | mutex_lock(&sessions_mutex); | |
112 | } | |
113 | ||
114 | void lttng_unlock_sessions(void) | |
115 | { | |
116 | mutex_unlock(&sessions_mutex); | |
117 | } | |
118 | ||
9fe593d2 FD |
119 | static struct lttng_transport *lttng_transport_find(const char *name) |
120 | { | |
121 | struct lttng_transport *transport; | |
122 | ||
123 | list_for_each_entry(transport, <tng_transport_list, node) { | |
124 | if (!strcmp(transport->name, name)) | |
125 | return transport; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
3c997079 MD |
130 | /* |
131 | * Called with sessions lock held. | |
132 | */ | |
133 | int lttng_session_active(void) | |
134 | { | |
8cdc1a81 | 135 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
136 | |
137 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 138 | if (iter->pub->active) |
3c997079 MD |
139 | return 1; |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
8cdc1a81 | 144 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 145 | { |
8cdc1a81 MD |
146 | struct lttng_kernel_session *session; |
147 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 148 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 149 | int i; |
4e3c1b9b MD |
150 | |
151 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 152 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 153 | if (!session) |
d83004aa | 154 | goto err; |
8cdc1a81 MD |
155 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
156 | if (!session_priv) | |
157 | goto err_free_session; | |
158 | session->priv = session_priv; | |
159 | session_priv->pub = session; | |
160 | ||
161 | INIT_LIST_HEAD(&session_priv->chan); | |
162 | INIT_LIST_HEAD(&session_priv->events); | |
163 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
164 | |
165 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
166 | GFP_KERNEL); | |
167 | if (!metadata_cache) | |
8cdc1a81 | 168 | goto err_free_session_private; |
0ca42eb7 | 169 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
170 | if (!metadata_cache->data) |
171 | goto err_free_cache; | |
172 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
173 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 174 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 175 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 176 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 177 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 178 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 179 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 180 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
181 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
182 | list_add(&session_priv->list, &sessions); | |
183 | ||
8c0393c3 MD |
184 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
185 | goto tracker_alloc_error; | |
186 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
187 | goto tracker_alloc_error; | |
188 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
189 | goto tracker_alloc_error; | |
190 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
195 | goto tracker_alloc_error; | |
196 | ||
4e3c1b9b | 197 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 198 | |
4e3c1b9b | 199 | return session; |
d83004aa | 200 | |
8c0393c3 MD |
201 | tracker_alloc_error: |
202 | lttng_id_tracker_fini(&session->pid_tracker); | |
203 | lttng_id_tracker_fini(&session->vpid_tracker); | |
204 | lttng_id_tracker_fini(&session->uid_tracker); | |
205 | lttng_id_tracker_fini(&session->vuid_tracker); | |
206 | lttng_id_tracker_fini(&session->gid_tracker); | |
207 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
208 | err_free_cache: |
209 | kfree(metadata_cache); | |
8cdc1a81 MD |
210 | err_free_session_private: |
211 | lttng_kvfree(session_priv); | |
d83004aa | 212 | err_free_session: |
48f5e0b5 | 213 | lttng_kvfree(session); |
d83004aa JD |
214 | err: |
215 | mutex_unlock(&sessions_mutex); | |
216 | return NULL; | |
217 | } | |
218 | ||
99f52fcc FD |
219 | static |
220 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
221 | { | |
222 | struct lttng_counter_transport *transport; | |
223 | ||
224 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
225 | if (!strcmp(transport->name, name)) | |
226 | return transport; | |
227 | } | |
228 | return NULL; | |
229 | } | |
230 | ||
231 | struct lttng_counter *lttng_kernel_counter_create( | |
232 | const char *counter_transport_name, | |
233 | size_t number_dimensions, const size_t *dimensions_sizes) | |
234 | { | |
235 | struct lttng_counter *counter = NULL; | |
236 | struct lttng_counter_transport *counter_transport = NULL; | |
237 | ||
238 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
239 | if (!counter_transport) { | |
240 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
241 | counter_transport_name); | |
242 | goto notransport; | |
243 | } | |
244 | if (!try_module_get(counter_transport->owner)) { | |
245 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
246 | goto notransport; | |
247 | } | |
248 | ||
249 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
250 | if (!counter) | |
251 | goto nomem; | |
252 | ||
253 | /* Create event notifier error counter. */ | |
254 | counter->ops = &counter_transport->ops; | |
255 | counter->transport = counter_transport; | |
256 | ||
257 | counter->counter = counter->ops->counter_create( | |
258 | number_dimensions, dimensions_sizes, 0); | |
259 | if (!counter->counter) { | |
260 | goto create_error; | |
261 | } | |
262 | ||
263 | return counter; | |
264 | ||
265 | create_error: | |
266 | lttng_kvfree(counter); | |
267 | nomem: | |
268 | if (counter_transport) | |
269 | module_put(counter_transport->owner); | |
270 | notransport: | |
271 | return NULL; | |
272 | } | |
273 | ||
750b05f2 FD |
274 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
275 | { | |
276 | struct lttng_transport *transport = NULL; | |
277 | struct lttng_event_notifier_group *event_notifier_group; | |
278 | const char *transport_name = "relay-event-notifier"; | |
279 | size_t subbuf_size = 4096; //TODO | |
280 | size_t num_subbuf = 16; //TODO | |
281 | unsigned int switch_timer_interval = 0; | |
282 | unsigned int read_timer_interval = 0; | |
dffef45d | 283 | int i; |
750b05f2 FD |
284 | |
285 | mutex_lock(&sessions_mutex); | |
286 | ||
287 | transport = lttng_transport_find(transport_name); | |
288 | if (!transport) { | |
289 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
290 | transport_name); | |
291 | goto notransport; | |
292 | } | |
293 | if (!try_module_get(transport->owner)) { | |
294 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
295 | transport_name); | |
296 | goto notransport; | |
297 | } | |
298 | ||
299 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
300 | GFP_KERNEL); | |
301 | if (!event_notifier_group) | |
302 | goto nomem; | |
303 | ||
304 | /* | |
305 | * Initialize the ring buffer used to store event notifier | |
306 | * notifications. | |
307 | */ | |
308 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 309 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
310 | transport_name, event_notifier_group, NULL, |
311 | subbuf_size, num_subbuf, switch_timer_interval, | |
312 | read_timer_interval); | |
313 | if (!event_notifier_group->chan) | |
314 | goto create_error; | |
315 | ||
316 | event_notifier_group->transport = transport; | |
dffef45d FD |
317 | |
318 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
319 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
320 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
321 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 322 | |
750b05f2 FD |
323 | list_add(&event_notifier_group->node, &event_notifier_groups); |
324 | ||
325 | mutex_unlock(&sessions_mutex); | |
326 | ||
327 | return event_notifier_group; | |
328 | ||
329 | create_error: | |
330 | lttng_kvfree(event_notifier_group); | |
331 | nomem: | |
332 | if (transport) | |
333 | module_put(transport->owner); | |
334 | notransport: | |
335 | mutex_unlock(&sessions_mutex); | |
336 | return NULL; | |
337 | } | |
338 | ||
d83004aa JD |
339 | void metadata_cache_destroy(struct kref *kref) |
340 | { | |
341 | struct lttng_metadata_cache *cache = | |
342 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 343 | vfree(cache->data); |
d83004aa | 344 | kfree(cache); |
4e3c1b9b MD |
345 | } |
346 | ||
8cdc1a81 | 347 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 348 | { |
f7d06400 | 349 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 350 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 351 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 352 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 353 | int ret; |
4e3c1b9b MD |
354 | |
355 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 356 | WRITE_ONCE(session->active, 0); |
f7d06400 | 357 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 358 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
359 | WARN_ON(ret); |
360 | } | |
6a338ba4 MD |
361 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) |
362 | _lttng_event_unregister(&event_recorder_priv->pub->parent); | |
abcca994 | 363 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 364 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 365 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
366 | WARN_ON(ret); |
367 | } | |
09710b83 MD |
368 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
369 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 370 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 371 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
372 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
373 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
374 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 375 | } |
8cdc1a81 MD |
376 | mutex_lock(&session->priv->metadata_cache->lock); |
377 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 378 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 379 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
380 | lttng_id_tracker_fini(&session->pid_tracker); |
381 | lttng_id_tracker_fini(&session->vpid_tracker); | |
382 | lttng_id_tracker_fini(&session->uid_tracker); | |
383 | lttng_id_tracker_fini(&session->vuid_tracker); | |
384 | lttng_id_tracker_fini(&session->gid_tracker); | |
385 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
386 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
387 | list_del(&session->priv->list); | |
4e3c1b9b | 388 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 389 | lttng_kvfree(session->priv); |
48f5e0b5 | 390 | lttng_kvfree(session); |
4e3c1b9b MD |
391 | } |
392 | ||
dffef45d FD |
393 | void lttng_event_notifier_group_destroy( |
394 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 395 | { |
09710b83 | 396 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 397 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
398 | int ret; |
399 | ||
750b05f2 FD |
400 | if (!event_notifier_group) |
401 | return; | |
402 | ||
403 | mutex_lock(&sessions_mutex); | |
dffef45d | 404 | |
6053e75e | 405 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
406 | WARN_ON(ret); |
407 | ||
a67ba386 | 408 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
6a338ba4 MD |
409 | &event_notifier_group->event_notifiers_head, parent.node) |
410 | _lttng_event_unregister(&event_notifier_priv->pub->parent); | |
dffef45d | 411 | |
b01155ba FD |
412 | /* Wait for in-flight event notifier to complete */ |
413 | synchronize_trace(); | |
414 | ||
21f58fb7 FD |
415 | irq_work_sync(&event_notifier_group->wakeup_pending); |
416 | ||
6053e75e MD |
417 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
418 | WARN_ON(ret); | |
8a8ac9a8 | 419 | |
09710b83 | 420 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 421 | &event_notifier_group->enablers_head, node) |
09710b83 | 422 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 423 | |
a67ba386 | 424 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 425 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 426 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 427 | |
99f52fcc FD |
428 | if (event_notifier_group->error_counter) { |
429 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 430 | |
99f52fcc FD |
431 | error_counter->ops->counter_destroy(error_counter->counter); |
432 | module_put(error_counter->transport->owner); | |
433 | lttng_kvfree(error_counter); | |
434 | event_notifier_group->error_counter = NULL; | |
435 | } | |
436 | ||
4a399b76 | 437 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
438 | module_put(event_notifier_group->transport->owner); |
439 | list_del(&event_notifier_group->node); | |
dffef45d | 440 | |
750b05f2 FD |
441 | mutex_unlock(&sessions_mutex); |
442 | lttng_kvfree(event_notifier_group); | |
443 | } | |
444 | ||
8cdc1a81 | 445 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
446 | { |
447 | int ret; | |
448 | ||
449 | mutex_lock(&sessions_mutex); | |
450 | ret = lttng_statedump_start(session); | |
451 | mutex_unlock(&sessions_mutex); | |
452 | return ret; | |
453 | } | |
454 | ||
8cdc1a81 | 455 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
456 | { |
457 | int ret = 0; | |
f7d06400 | 458 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
459 | |
460 | mutex_lock(&sessions_mutex); | |
461 | if (session->active) { | |
462 | ret = -EBUSY; | |
463 | goto end; | |
464 | } | |
c099397a | 465 | |
3c997079 | 466 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 467 | session->priv->tstate = 1; |
3c997079 | 468 | |
4ef81e4a | 469 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 470 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 471 | |
c099397a MD |
472 | /* |
473 | * Snapshot the number of events per channel to know the type of header | |
474 | * we need to use. | |
475 | */ | |
f7d06400 MD |
476 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
477 | if (chan_priv->header_type) | |
478 | continue; /* don't change it if session stop/restart */ | |
479 | if (chan_priv->free_event_id < 31) | |
480 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 481 | else |
f7d06400 | 482 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
483 | } |
484 | ||
64af2437 | 485 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
486 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
487 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
488 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 489 | } |
64af2437 | 490 | |
a8f2d0c7 | 491 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 492 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 493 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 494 | if (ret) { |
a8f2d0c7 | 495 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
496 | goto end; |
497 | } | |
498 | ret = lttng_statedump_start(session); | |
360f38ea | 499 | if (ret) |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
501 | end: |
502 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 503 | return ret; |
c0e31d2e MD |
504 | } |
505 | ||
8cdc1a81 | 506 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
507 | { |
508 | int ret = 0; | |
f7d06400 | 509 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
510 | |
511 | mutex_lock(&sessions_mutex); | |
512 | if (!session->active) { | |
513 | ret = -EBUSY; | |
514 | goto end; | |
515 | } | |
a8f2d0c7 | 516 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
517 | |
518 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 519 | session->priv->tstate = 0; |
b2bc0bc8 | 520 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
521 | |
522 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
523 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
524 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
525 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 526 | } |
c0e31d2e MD |
527 | end: |
528 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 529 | return ret; |
c0e31d2e MD |
530 | } |
531 | ||
8cdc1a81 | 532 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
533 | { |
534 | int ret = 0; | |
f7d06400 | 535 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 536 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 537 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
538 | struct lttng_metadata_stream *stream; |
539 | ||
540 | mutex_lock(&sessions_mutex); | |
541 | if (!session->active) { | |
542 | ret = -EBUSY; | |
543 | goto end; | |
544 | } | |
545 | ||
546 | mutex_lock(&cache->lock); | |
547 | memset(cache->data, 0, cache->cache_alloc); | |
548 | cache->metadata_written = 0; | |
549 | cache->version++; | |
8cdc1a81 | 550 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
551 | stream->metadata_out = 0; |
552 | stream->metadata_in = 0; | |
553 | } | |
554 | mutex_unlock(&cache->lock); | |
555 | ||
8cdc1a81 | 556 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
557 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
558 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
559 | } |
560 | ||
f237aef8 | 561 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 562 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
563 | } |
564 | ||
565 | ret = _lttng_session_metadata_statedump(session); | |
566 | ||
567 | end: | |
568 | mutex_unlock(&sessions_mutex); | |
569 | return ret; | |
570 | } | |
571 | ||
6b757027 MD |
572 | static |
573 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
574 | { | |
575 | struct lttng_kernel_channel_buffer *chan_buf; | |
576 | ||
577 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
578 | return false; | |
579 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
580 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
581 | return true; | |
582 | return false; | |
583 | } | |
584 | ||
585 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 586 | { |
3c997079 | 587 | int ret = 0; |
e64957da | 588 | |
3c997079 | 589 | mutex_lock(&sessions_mutex); |
6b757027 | 590 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
591 | ret = -EPERM; |
592 | goto end; | |
593 | } | |
6b757027 | 594 | if (channel->enabled) { |
3c997079 MD |
595 | ret = -EEXIST; |
596 | goto end; | |
597 | } | |
598 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
599 | channel->priv->tstate = 1; |
600 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 601 | /* Set atomically the state to "enabled" */ |
6b757027 | 602 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
603 | end: |
604 | mutex_unlock(&sessions_mutex); | |
605 | return ret; | |
e64957da MD |
606 | } |
607 | ||
6b757027 | 608 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 609 | { |
3c997079 | 610 | int ret = 0; |
e64957da | 611 | |
3c997079 | 612 | mutex_lock(&sessions_mutex); |
6b757027 | 613 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
614 | ret = -EPERM; |
615 | goto end; | |
616 | } | |
6b757027 | 617 | if (!channel->enabled) { |
3c997079 MD |
618 | ret = -EEXIST; |
619 | goto end; | |
620 | } | |
621 | /* Set atomically the state to "disabled" */ | |
6b757027 | 622 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 623 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
624 | channel->priv->tstate = 0; |
625 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
626 | end: |
627 | mutex_unlock(&sessions_mutex); | |
628 | return ret; | |
e64957da MD |
629 | } |
630 | ||
9d993668 | 631 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 632 | { |
3c997079 | 633 | int ret = 0; |
e64957da | 634 | |
3c997079 | 635 | mutex_lock(&sessions_mutex); |
9d993668 MD |
636 | switch (event->type) { |
637 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
638 | { | |
639 | struct lttng_kernel_event_recorder *event_recorder = | |
640 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
641 | ||
f7d06400 | 642 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
643 | ret = -EPERM; |
644 | goto end; | |
645 | } | |
a0493bef | 646 | break; |
9d993668 MD |
647 | } |
648 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
649 | switch (event->priv->instrumentation) { | |
650 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
651 | ret = -EINVAL; | |
652 | goto end; | |
653 | default: | |
654 | break; | |
655 | } | |
a0493bef MD |
656 | break; |
657 | default: | |
9d993668 | 658 | break; |
a0493bef | 659 | } |
e64957da | 660 | |
9d993668 | 661 | if (event->enabled) { |
3c997079 MD |
662 | ret = -EEXIST; |
663 | goto end; | |
664 | } | |
a67ba386 | 665 | switch (event->priv->instrumentation) { |
c190d76e MJ |
666 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
667 | lttng_fallthrough; | |
606828e4 | 668 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
669 | ret = -EINVAL; |
670 | break; | |
b4a75708 | 671 | |
c190d76e MJ |
672 | case LTTNG_KERNEL_ABI_KPROBE: |
673 | lttng_fallthrough; | |
606828e4 | 674 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 675 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 676 | break; |
b4a75708 | 677 | |
606828e4 | 678 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 679 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 680 | break; |
b4a75708 | 681 | |
c190d76e MJ |
682 | case LTTNG_KERNEL_ABI_FUNCTION: |
683 | lttng_fallthrough; | |
684 | case LTTNG_KERNEL_ABI_NOOP: | |
685 | lttng_fallthrough; | |
a0493bef MD |
686 | default: |
687 | WARN_ON_ONCE(1); | |
688 | ret = -EINVAL; | |
689 | } | |
3c997079 MD |
690 | end: |
691 | mutex_unlock(&sessions_mutex); | |
692 | return ret; | |
e64957da MD |
693 | } |
694 | ||
9d993668 | 695 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
696 | { |
697 | int ret = 0; | |
698 | ||
699 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
700 | switch (event->type) { |
701 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
702 | { | |
703 | struct lttng_kernel_event_recorder *event_recorder = | |
704 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
705 | ||
f7d06400 | 706 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
707 | ret = -EPERM; |
708 | goto end; | |
709 | } | |
b01155ba | 710 | break; |
9d993668 MD |
711 | } |
712 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
713 | switch (event->priv->instrumentation) { | |
714 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
715 | ret = -EINVAL; | |
716 | goto end; | |
717 | default: | |
718 | break; | |
719 | } | |
2b16f0c9 | 720 | break; |
dffef45d | 721 | default: |
9d993668 | 722 | break; |
dffef45d | 723 | } |
dffef45d | 724 | |
a67ba386 | 725 | if (!event->enabled) { |
dffef45d FD |
726 | ret = -EEXIST; |
727 | goto end; | |
728 | } | |
a67ba386 | 729 | switch (event->priv->instrumentation) { |
c190d76e MJ |
730 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
731 | lttng_fallthrough; | |
606828e4 | 732 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
733 | ret = -EINVAL; |
734 | break; | |
b4a75708 | 735 | |
c190d76e MJ |
736 | case LTTNG_KERNEL_ABI_KPROBE: |
737 | lttng_fallthrough; | |
606828e4 | 738 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 739 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 740 | break; |
b4a75708 | 741 | |
9d993668 MD |
742 | case LTTNG_KERNEL_ABI_KRETPROBE: |
743 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
744 | break; | |
745 | ||
c190d76e MJ |
746 | case LTTNG_KERNEL_ABI_FUNCTION: |
747 | lttng_fallthrough; | |
748 | case LTTNG_KERNEL_ABI_NOOP: | |
749 | lttng_fallthrough; | |
dffef45d FD |
750 | default: |
751 | WARN_ON_ONCE(1); | |
752 | ret = -EINVAL; | |
753 | } | |
754 | end: | |
755 | mutex_unlock(&sessions_mutex); | |
756 | return ret; | |
757 | } | |
758 | ||
4e252d1e | 759 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
760 | const char *transport_name, |
761 | void *buf_addr, | |
4e3c1b9b MD |
762 | size_t subbuf_size, size_t num_subbuf, |
763 | unsigned int switch_timer_interval, | |
d83004aa JD |
764 | unsigned int read_timer_interval, |
765 | enum channel_type channel_type) | |
4e3c1b9b | 766 | { |
f7d06400 MD |
767 | struct lttng_kernel_channel_buffer *chan; |
768 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 769 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
770 | |
771 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 772 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 773 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 774 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 775 | if (!transport) { |
5a15f70c | 776 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 777 | transport_name); |
c0e31d2e | 778 | goto notransport; |
f3d01b96 | 779 | } |
a33c9927 | 780 | if (!try_module_get(transport->owner)) { |
5a15f70c | 781 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
782 | goto notransport; |
783 | } | |
f7d06400 | 784 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 785 | if (!chan) |
c0e31d2e | 786 | goto nomem; |
f7d06400 MD |
787 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
788 | if (!chan_priv) | |
789 | goto nomem_priv; | |
790 | chan->priv = chan_priv; | |
791 | chan_priv->pub = chan; | |
792 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
793 | chan->parent.session = session; | |
794 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 795 | chan->ops = &transport->ops; |
125b4df4 MD |
796 | /* |
797 | * Note: the channel creation op already writes into the packet | |
798 | * headers. Therefore the "chan" information used as input | |
799 | * should be already accessible. | |
800 | */ | |
f7d06400 | 801 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
802 | chan, buf_addr, subbuf_size, num_subbuf, |
803 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 804 | if (!chan->priv->rb_chan) |
f3d01b96 | 805 | goto create_error; |
f7d06400 MD |
806 | chan->priv->parent.tstate = 1; |
807 | chan->parent.enabled = 1; | |
808 | chan->priv->transport = transport; | |
809 | chan->priv->channel_type = channel_type; | |
810 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
811 | mutex_unlock(&sessions_mutex); |
812 | return chan; | |
813 | ||
f3d01b96 | 814 | create_error: |
f7d06400 MD |
815 | kfree(chan_priv); |
816 | nomem_priv: | |
f3d01b96 | 817 | kfree(chan); |
c0e31d2e | 818 | nomem: |
a33c9927 MD |
819 | if (transport) |
820 | module_put(transport->owner); | |
c0e31d2e | 821 | notransport: |
e5382b6d | 822 | active: |
4e3c1b9b MD |
823 | mutex_unlock(&sessions_mutex); |
824 | return NULL; | |
825 | } | |
826 | ||
827 | /* | |
d83004aa JD |
828 | * Only used internally at session destruction for per-cpu channels, and |
829 | * when metadata channel is released. | |
830 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 831 | */ |
aa7c23a9 | 832 | static |
f7d06400 | 833 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 834 | { |
f7d06400 MD |
835 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
836 | module_put(chan->priv->transport->owner); | |
837 | list_del(&chan->priv->node); | |
838 | lttng_kernel_destroy_context(chan->priv->ctx); | |
839 | kfree(chan->priv); | |
4e3c1b9b MD |
840 | kfree(chan); |
841 | } | |
842 | ||
f7d06400 | 843 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 844 | { |
f7d06400 | 845 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
846 | |
847 | /* Protect the metadata cache with the sessions_mutex. */ | |
848 | mutex_lock(&sessions_mutex); | |
849 | _lttng_channel_destroy(chan); | |
850 | mutex_unlock(&sessions_mutex); | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
853 | ||
854 | static | |
855 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
856 | { | |
857 | stream->finalized = 1; | |
858 | wake_up_interruptible(&stream->read_wait); | |
859 | } | |
860 | ||
51d248b5 MD |
861 | static |
862 | bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler) | |
863 | { | |
864 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
865 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
866 | ||
867 | switch (event_enabler->enabler_type) { | |
868 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
869 | { | |
870 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
871 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
872 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
873 | ||
874 | switch (itype) { | |
875 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
876 | lttng_fallthrough; | |
877 | case LTTNG_KERNEL_ABI_KPROBE: | |
878 | lttng_fallthrough; | |
879 | case LTTNG_KERNEL_ABI_SYSCALL: | |
880 | lttng_fallthrough; | |
881 | case LTTNG_KERNEL_ABI_UPROBE: | |
882 | if (chan->priv->free_event_id == -1U) | |
883 | return false; | |
884 | return true; | |
885 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
886 | /* kretprobes require 2 event IDs. */ | |
887 | if (chan->priv->free_event_id >= -2U) | |
888 | return false; | |
889 | return true; | |
890 | default: | |
891 | WARN_ON_ONCE(1); | |
892 | return false; | |
893 | } | |
894 | } | |
895 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
896 | return true; | |
897 | default: | |
898 | WARN_ON_ONCE(1); | |
899 | return false; | |
900 | } | |
901 | } | |
902 | ||
756a020c MD |
903 | static |
904 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
905 | { | |
906 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
907 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
908 | ||
909 | switch (event_enabler->enabler_type) { | |
910 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
911 | { | |
912 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
913 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
914 | struct lttng_kernel_event_recorder *event_recorder; | |
915 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
916 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
917 | ||
918 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
919 | if (!event_recorder) | |
920 | return NULL; | |
921 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
922 | if (!event_recorder_priv) { | |
923 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
924 | return NULL; | |
925 | } | |
926 | event_recorder_priv->pub = event_recorder; | |
927 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
928 | event_recorder->priv = event_recorder_priv; | |
929 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
930 | ||
931 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
932 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
933 | event_recorder->priv->parent.instrumentation = itype; | |
934 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
935 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
936 | ||
937 | event_recorder->chan = chan; | |
938 | event_recorder->priv->id = chan->priv->free_event_id++; | |
939 | return &event_recorder->parent; | |
940 | } | |
941 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
942 | { | |
943 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
944 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
945 | struct lttng_kernel_event_notifier *event_notifier; | |
946 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
947 | ||
948 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
949 | if (!event_notifier) | |
950 | return NULL; | |
951 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
952 | if (!event_notifier_priv) { | |
953 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
954 | return NULL; | |
955 | } | |
956 | event_notifier_priv->pub = event_notifier; | |
957 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
958 | event_notifier->priv = event_notifier_priv; | |
959 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
960 | ||
961 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
962 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
963 | event_notifier->priv->parent.instrumentation = itype; | |
964 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
965 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
966 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
967 | ||
968 | event_notifier->priv->group = event_notifier_enabler->group; | |
969 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
970 | event_notifier->priv->num_captures = 0; | |
971 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
972 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
973 | return &event_notifier->parent; | |
974 | } | |
975 | default: | |
976 | return NULL; | |
977 | } | |
978 | } | |
979 | ||
980 | static | |
981 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
982 | { | |
983 | switch (event->type) { | |
984 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
985 | { | |
986 | struct lttng_kernel_event_recorder *event_recorder = | |
987 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
988 | ||
989 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
990 | kmem_cache_free(event_recorder_cache, event_recorder); | |
991 | break; | |
992 | } | |
993 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
994 | { | |
995 | struct lttng_kernel_event_notifier *event_notifier = | |
996 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
997 | ||
998 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
999 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1000 | break; | |
1001 | } | |
1002 | default: | |
1003 | WARN_ON_ONCE(1); | |
1004 | } | |
1005 | } | |
a101fa10 | 1006 | |
ccefc7ab MD |
1007 | static |
1008 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
1009 | { | |
1010 | switch (event->type) { | |
1011 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1012 | return 0; | |
1013 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1014 | { | |
1015 | struct lttng_kernel_event_notifier *event_notifier = | |
1016 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1017 | struct lttng_counter *error_counter; | |
1018 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
1019 | size_t dimension_index[1]; | |
1020 | int ret; | |
1021 | ||
1022 | /* | |
1023 | * Clear the error counter bucket. The sessiond keeps track of which | |
1024 | * bucket is currently in use. We trust it. The session lock | |
1025 | * synchronizes against concurrent creation of the error | |
1026 | * counter. | |
1027 | */ | |
1028 | error_counter = event_notifier_group->error_counter; | |
1029 | if (!error_counter) | |
1030 | return 0; | |
1031 | /* | |
1032 | * Check that the index is within the boundary of the counter. | |
1033 | */ | |
1034 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1035 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1036 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1037 | return -EINVAL; | |
1038 | } | |
1039 | ||
1040 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1041 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1042 | if (ret) { | |
1043 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1044 | event_notifier->priv->error_counter_index); | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | return 0; | |
1048 | } | |
1049 | default: | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | } | |
1053 | ||
e5382b6d MD |
1054 | /* |
1055 | * Supports event creation while tracing session is active. | |
3c997079 | 1056 | * Needs to be called with sessions mutex held. |
e5382b6d | 1057 | */ |
13a2dfca | 1058 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
def1e304 | 1059 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1060 | { |
13a2dfca MD |
1061 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
1062 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); | |
1063 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
def1e304 | 1064 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1065 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1066 | struct lttng_kernel_event_common *event; |
3c997079 MD |
1067 | const char *event_name; |
1068 | struct hlist_head *head; | |
3d084699 | 1069 | int ret; |
4e3c1b9b | 1070 | |
13a2dfca | 1071 | if (!lttng_kernel_event_id_available(event_enabler)) { |
4cf0bf51 | 1072 | ret = -EMFILE; |
e5382b6d | 1073 | goto full; |
abc0446a | 1074 | } |
3c997079 MD |
1075 | |
1076 | switch (itype) { | |
606828e4 | 1077 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1078 | event_name = event_desc->event_name; |
3c997079 | 1079 | break; |
b4a75708 | 1080 | |
c190d76e MJ |
1081 | case LTTNG_KERNEL_ABI_KPROBE: |
1082 | lttng_fallthrough; | |
1083 | case LTTNG_KERNEL_ABI_UPROBE: | |
1084 | lttng_fallthrough; | |
1085 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1086 | lttng_fallthrough; | |
606828e4 | 1087 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1088 | event_name = event_param->name; |
1089 | break; | |
b4a75708 | 1090 | |
c190d76e MJ |
1091 | case LTTNG_KERNEL_ABI_FUNCTION: |
1092 | lttng_fallthrough; | |
1093 | case LTTNG_KERNEL_ABI_NOOP: | |
1094 | lttng_fallthrough; | |
3c997079 MD |
1095 | default: |
1096 | WARN_ON_ONCE(1); | |
1097 | ret = -EINVAL; | |
1098 | goto type_error; | |
1099 | } | |
4a11ef1c | 1100 | |
0def9170 | 1101 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1102 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
13a2dfca | 1103 | if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) { |
3c997079 MD |
1104 | ret = -EEXIST; |
1105 | goto exist; | |
abc0446a MD |
1106 | } |
1107 | } | |
3c997079 | 1108 | |
13a2dfca | 1109 | event = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1110 | if (!event) { |
4cf0bf51 | 1111 | ret = -ENOMEM; |
756a020c | 1112 | goto alloc_error; |
abc0446a | 1113 | } |
3c997079 MD |
1114 | |
1115 | switch (itype) { | |
606828e4 | 1116 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1117 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1118 | event->enabled = 0; |
1119 | event->priv->registered = 0; | |
1120 | event->priv->desc = lttng_event_desc_get(event_name); | |
1121 | if (!event->priv->desc) { | |
4cf0bf51 | 1122 | ret = -ENOENT; |
d3dbe23c | 1123 | goto register_error; |
abc0446a | 1124 | } |
3c997079 MD |
1125 | /* Populate lttng_event structure before event registration. */ |
1126 | smp_wmb(); | |
baf20995 | 1127 | break; |
b4a75708 | 1128 | |
606828e4 | 1129 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1130 | /* |
1131 | * Needs to be explicitly enabled after creation, since | |
1132 | * we may want to apply filters. | |
1133 | */ | |
7cd0f696 MD |
1134 | event->enabled = 0; |
1135 | event->priv->registered = 1; | |
3c997079 MD |
1136 | /* |
1137 | * Populate lttng_event structure before event | |
1138 | * registration. | |
1139 | */ | |
1140 | smp_wmb(); | |
8bf17deb | 1141 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1142 | event_param->u.kprobe.symbol_name, |
1143 | event_param->u.kprobe.offset, | |
1144 | event_param->u.kprobe.addr, | |
7cd0f696 | 1145 | event); |
abc0446a | 1146 | if (ret) { |
4cf0bf51 | 1147 | ret = -EINVAL; |
d6d808f3 | 1148 | goto register_error; |
abc0446a | 1149 | } |
7cd0f696 | 1150 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1151 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1152 | break; |
b4a75708 | 1153 | |
606828e4 | 1154 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1155 | { |
756a020c | 1156 | struct lttng_kernel_event_common *event_return; |
7371f44c MD |
1157 | |
1158 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1159 | /* |
1160 | * Needs to be explicitly enabled after creation, since | |
1161 | * we may want to apply filters. | |
1162 | */ | |
756a020c MD |
1163 | event->enabled = 0; |
1164 | event->priv->registered = 1; | |
a67ba386 | 1165 | |
13a2dfca | 1166 | event_return = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1167 | if (!event) { |
a67ba386 | 1168 | ret = -ENOMEM; |
756a020c | 1169 | goto alloc_error; |
a67ba386 | 1170 | } |
756a020c MD |
1171 | |
1172 | event_return->enabled = 0; | |
1173 | event_return->priv->registered = 1; | |
1174 | ||
7371f44c | 1175 | /* |
a90917c3 | 1176 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1177 | */ |
1178 | smp_wmb(); | |
3c997079 | 1179 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1180 | event_param->u.kretprobe.symbol_name, |
1181 | event_param->u.kretprobe.offset, | |
1182 | event_param->u.kretprobe.addr, | |
756a020c | 1183 | event, event_return); |
7371f44c | 1184 | if (ret) { |
756a020c | 1185 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1186 | ret = -EINVAL; |
7371f44c MD |
1187 | goto register_error; |
1188 | } | |
1189 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1190 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1191 | WARN_ON_ONCE(!ret); |
756a020c | 1192 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1193 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1194 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1195 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1196 | if (ret) { |
756a020c | 1197 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1198 | module_put(event_return->priv->desc->owner); |
1199 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1200 | goto statedump_error; |
1201 | } | |
19b98250 | 1202 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1203 | break; |
1204 | } | |
b4a75708 | 1205 | |
606828e4 | 1206 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1207 | /* |
1208 | * Needs to be explicitly enabled after creation, since | |
1209 | * we may want to apply filters. | |
1210 | */ | |
7cd0f696 MD |
1211 | event->enabled = 0; |
1212 | event->priv->registered = 0; | |
1213 | event->priv->desc = event_desc; | |
badfe9f5 | 1214 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1215 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1216 | ret = -EINVAL; |
1217 | goto register_error; | |
606828e4 | 1218 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1219 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1220 | break; |
606828e4 | 1221 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1222 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1223 | break; |
1224 | } | |
1225 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1226 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1227 | ret = -EINVAL; |
1228 | goto register_error; | |
606828e4 | 1229 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1230 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1231 | break; |
606828e4 | 1232 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1233 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1234 | break; |
1235 | } | |
7cd0f696 | 1236 | if (!event->priv->desc) { |
4cf0bf51 | 1237 | ret = -EINVAL; |
259b6cb3 | 1238 | goto register_error; |
abc0446a | 1239 | } |
1ec65de1 | 1240 | break; |
b4a75708 | 1241 | |
606828e4 | 1242 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1243 | /* |
1244 | * Needs to be explicitly enabled after creation, since | |
1245 | * we may want to apply filters. | |
1246 | */ | |
7cd0f696 MD |
1247 | event->enabled = 0; |
1248 | event->priv->registered = 1; | |
3aed4dca | 1249 | |
a344f64b FD |
1250 | /* |
1251 | * Populate lttng_event structure before event | |
1252 | * registration. | |
1253 | */ | |
1254 | smp_wmb(); | |
149b9a9d | 1255 | |
83b802dc | 1256 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1257 | event_param->u.uprobe.fd, |
7cd0f696 | 1258 | event); |
149b9a9d YB |
1259 | if (ret) |
1260 | goto register_error; | |
7cd0f696 | 1261 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1262 | WARN_ON_ONCE(!ret); |
1263 | break; | |
b4a75708 | 1264 | |
baf20995 MD |
1265 | default: |
1266 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1267 | ret = -EINVAL; |
df07930b | 1268 | goto register_error; |
baf20995 | 1269 | } |
13a2dfca | 1270 | |
ee7e9a18 | 1271 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1272 | WARN_ON_ONCE(ret > 0); |
1273 | if (ret) { | |
c099397a | 1274 | goto statedump_error; |
abc0446a | 1275 | } |
dffef45d | 1276 | |
ccefc7ab MD |
1277 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1278 | if (ret) | |
1279 | goto register_error; | |
c4e31059 | 1280 | |
c4e31059 | 1281 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1282 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1283 | |
13a2dfca | 1284 | return event; |
dffef45d | 1285 | |
13a2dfca MD |
1286 | statedump_error: |
1287 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1288 | register_error: |
756a020c MD |
1289 | lttng_kernel_event_free(event); |
1290 | alloc_error: | |
dffef45d FD |
1291 | exist: |
1292 | type_error: | |
13a2dfca | 1293 | full: |
dffef45d FD |
1294 | return ERR_PTR(ret); |
1295 | } | |
1296 | ||
83006ee0 MD |
1297 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1298 | const struct lttng_kernel_event_desc *event_desc) | |
1299 | { | |
1300 | struct lttng_kernel_event_common *event; | |
1301 | ||
1302 | mutex_lock(&sessions_mutex); | |
1303 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1304 | mutex_unlock(&sessions_mutex); | |
1305 | return event; | |
1306 | } | |
1307 | ||
99f52fcc FD |
1308 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1309 | const size_t *dim_indexes, int32_t cpu, | |
1310 | int64_t *val, bool *overflow, bool *underflow) | |
1311 | { | |
1312 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1313 | cpu, val, overflow, underflow); | |
1314 | } | |
1315 | ||
1316 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1317 | const size_t *dim_indexes, int64_t *val, | |
1318 | bool *overflow, bool *underflow) | |
1319 | { | |
1320 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1321 | val, overflow, underflow); | |
1322 | } | |
1323 | ||
1324 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1325 | const size_t *dim_indexes) | |
1326 | { | |
1327 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1328 | } | |
1329 | ||
6a338ba4 | 1330 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1331 | static |
0c851fa0 | 1332 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1333 | { |
437d5aa5 | 1334 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1335 | int ret = -EINVAL; |
3c997079 | 1336 | |
6a338ba4 | 1337 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1338 | |
0c851fa0 MD |
1339 | desc = event->priv->desc; |
1340 | switch (event->priv->instrumentation) { | |
606828e4 | 1341 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a6837bed | 1342 | ret = lttng_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1343 | desc->tp_class->probe_callback, |
0c851fa0 | 1344 | event); |
4ecb5ad5 | 1345 | break; |
b4a75708 | 1346 | |
606828e4 | 1347 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1348 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1349 | break; |
b4a75708 | 1350 | |
c190d76e MJ |
1351 | case LTTNG_KERNEL_ABI_KPROBE: |
1352 | lttng_fallthrough; | |
1353 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1354 | ret = 0; |
f0bcc14c | 1355 | break; |
0c851fa0 MD |
1356 | |
1357 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1358 | switch (event->type) { | |
1359 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1360 | ret = 0; | |
1361 | break; | |
1362 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1363 | WARN_ON_ONCE(1); | |
1364 | break; | |
1365 | } | |
4ecb5ad5 | 1366 | break; |
b4a75708 | 1367 | |
c190d76e MJ |
1368 | case LTTNG_KERNEL_ABI_FUNCTION: |
1369 | lttng_fallthrough; | |
1370 | case LTTNG_KERNEL_ABI_NOOP: | |
1371 | lttng_fallthrough; | |
4ecb5ad5 MD |
1372 | default: |
1373 | WARN_ON_ONCE(1); | |
1374 | } | |
6a338ba4 | 1375 | WARN_ON_ONCE(ret); |
3c997079 | 1376 | if (!ret) |
0c851fa0 | 1377 | event->priv->registered = 1; |
3c997079 MD |
1378 | } |
1379 | ||
6a338ba4 MD |
1380 | static |
1381 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1382 | { |
f0bcc14c | 1383 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1384 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1385 | int ret = -EINVAL; |
1386 | ||
6a338ba4 | 1387 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1388 | |
a67ba386 MD |
1389 | desc = event_priv->desc; |
1390 | switch (event_priv->instrumentation) { | |
606828e4 | 1391 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a6837bed | 1392 | ret = lttng_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1393 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1394 | event); |
baf20995 | 1395 | break; |
b4a75708 | 1396 | |
606828e4 | 1397 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1398 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1399 | ret = 0; |
1400 | break; | |
b4a75708 | 1401 | |
606828e4 | 1402 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1403 | switch (event->type) { |
1404 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1405 | lttng_kretprobes_unregister(event); | |
1406 | ret = 0; | |
1407 | break; | |
1408 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1409 | WARN_ON_ONCE(1); | |
1410 | break; | |
1411 | } | |
7371f44c | 1412 | break; |
b4a75708 | 1413 | |
606828e4 | 1414 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1415 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1416 | break; |
b4a75708 | 1417 | |
606828e4 | 1418 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1419 | switch (event->type) { |
1420 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1421 | ret = 0; | |
1422 | break; | |
1423 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1424 | WARN_ON_ONCE(1); | |
1425 | break; | |
1426 | } | |
259b6cb3 | 1427 | break; |
b4a75708 | 1428 | |
606828e4 | 1429 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1430 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1431 | ret = 0; |
1432 | break; | |
b4a75708 | 1433 | |
c190d76e MJ |
1434 | case LTTNG_KERNEL_ABI_FUNCTION: |
1435 | lttng_fallthrough; | |
baf20995 MD |
1436 | default: |
1437 | WARN_ON_ONCE(1); | |
1438 | } | |
6a338ba4 | 1439 | WARN_ON_ONCE(ret); |
3c997079 | 1440 | if (!ret) |
a67ba386 | 1441 | event_priv->registered = 0; |
6a338ba4 MD |
1442 | } |
1443 | ||
1444 | static | |
1445 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1446 | { | |
1447 | if (event->priv->registered) | |
1448 | unregister_event(event); | |
dda6a249 MD |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * Only used internally at session destruction. | |
1453 | */ | |
be066e6c | 1454 | static |
0648898e | 1455 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1456 | { |
0648898e | 1457 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1458 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1459 | ||
0648898e MD |
1460 | lttng_free_event_filter_runtime(event); |
1461 | /* Free event enabler refs */ | |
1462 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1463 | &event_priv->enablers_ref_head, node) | |
1464 | kfree(enabler_ref); | |
b4a75708 | 1465 | |
0648898e MD |
1466 | switch (event->type) { |
1467 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1468 | { | |
1469 | struct lttng_kernel_event_recorder *event_recorder = | |
1470 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1471 | |
0648898e MD |
1472 | switch (event_priv->instrumentation) { |
1473 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1474 | lttng_event_desc_put(event_priv->desc); | |
1475 | break; | |
b4a75708 | 1476 | |
0648898e MD |
1477 | case LTTNG_KERNEL_ABI_KPROBE: |
1478 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1479 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1480 | break; |
b4a75708 | 1481 | |
0648898e MD |
1482 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1483 | module_put(event_priv->desc->owner); | |
eb6b47db | 1484 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1485 | break; |
b4a75708 | 1486 | |
0648898e MD |
1487 | case LTTNG_KERNEL_ABI_SYSCALL: |
1488 | break; | |
4e3c1b9b | 1489 | |
0648898e MD |
1490 | case LTTNG_KERNEL_ABI_UPROBE: |
1491 | module_put(event_priv->desc->owner); | |
17806c46 | 1492 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1493 | break; |
3ef5cc03 | 1494 | |
c190d76e MJ |
1495 | case LTTNG_KERNEL_ABI_FUNCTION: |
1496 | lttng_fallthrough; | |
1497 | case LTTNG_KERNEL_ABI_NOOP: | |
1498 | lttng_fallthrough; | |
0648898e MD |
1499 | default: |
1500 | WARN_ON_ONCE(1); | |
1501 | } | |
f237aef8 | 1502 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1503 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1504 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1505 | break; |
0648898e MD |
1506 | } |
1507 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1508 | { | |
1509 | struct lttng_kernel_event_notifier *event_notifier = | |
1510 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1511 | |
0648898e MD |
1512 | switch (event_notifier->priv->parent.instrumentation) { |
1513 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1514 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1515 | break; | |
b4a75708 | 1516 | |
0648898e MD |
1517 | case LTTNG_KERNEL_ABI_KPROBE: |
1518 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1519 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1520 | break; |
b4a75708 | 1521 | |
0648898e MD |
1522 | case LTTNG_KERNEL_ABI_SYSCALL: |
1523 | break; | |
b4a75708 | 1524 | |
0648898e MD |
1525 | case LTTNG_KERNEL_ABI_UPROBE: |
1526 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1527 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1528 | break; |
1529 | ||
c190d76e MJ |
1530 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1531 | lttng_fallthrough; | |
1532 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1533 | lttng_fallthrough; | |
1534 | case LTTNG_KERNEL_ABI_NOOP: | |
1535 | lttng_fallthrough; | |
0648898e MD |
1536 | default: |
1537 | WARN_ON_ONCE(1); | |
1538 | } | |
f237aef8 | 1539 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1540 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1541 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1542 | break; | |
1543 | } | |
dffef45d FD |
1544 | default: |
1545 | WARN_ON_ONCE(1); | |
1546 | } | |
dffef45d FD |
1547 | } |
1548 | ||
8c0393c3 | 1549 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1550 | enum tracker_type tracker_type) |
e0130fab | 1551 | { |
d1f652f8 MD |
1552 | switch (tracker_type) { |
1553 | case TRACKER_PID: | |
1554 | return &session->pid_tracker; | |
1555 | case TRACKER_VPID: | |
1556 | return &session->vpid_tracker; | |
1557 | case TRACKER_UID: | |
1558 | return &session->uid_tracker; | |
1559 | case TRACKER_VUID: | |
1560 | return &session->vuid_tracker; | |
1561 | case TRACKER_GID: | |
1562 | return &session->gid_tracker; | |
1563 | case TRACKER_VGID: | |
1564 | return &session->vgid_tracker; | |
1565 | default: | |
1566 | WARN_ON_ONCE(1); | |
1567 | return NULL; | |
1568 | } | |
1569 | } | |
1570 | ||
8cdc1a81 | 1571 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1572 | enum tracker_type tracker_type, int id) |
1573 | { | |
8c0393c3 | 1574 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1575 | int ret; |
1576 | ||
d1f652f8 MD |
1577 | tracker = get_tracker(session, tracker_type); |
1578 | if (!tracker) | |
1579 | return -EINVAL; | |
1580 | if (id < -1) | |
e0130fab MD |
1581 | return -EINVAL; |
1582 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1583 | if (id == -1) { |
1584 | /* track all ids: destroy tracker. */ | |
1585 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1586 | ret = 0; |
1587 | } else { | |
d1f652f8 | 1588 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1589 | } |
e0130fab MD |
1590 | mutex_unlock(&sessions_mutex); |
1591 | return ret; | |
1592 | } | |
1593 | ||
8cdc1a81 | 1594 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1595 | enum tracker_type tracker_type, int id) |
e0130fab | 1596 | { |
8c0393c3 | 1597 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1598 | int ret; |
1599 | ||
d1f652f8 MD |
1600 | tracker = get_tracker(session, tracker_type); |
1601 | if (!tracker) | |
1602 | return -EINVAL; | |
1603 | if (id < -1) | |
e0130fab MD |
1604 | return -EINVAL; |
1605 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1606 | if (id == -1) { |
1607 | /* untrack all ids: replace by empty tracker. */ | |
1608 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1609 | } else { |
d1f652f8 | 1610 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1611 | } |
e0130fab MD |
1612 | mutex_unlock(&sessions_mutex); |
1613 | return ret; | |
1614 | } | |
1615 | ||
7e6f9ef6 | 1616 | static |
d1f652f8 | 1617 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1618 | { |
8c0393c3 MD |
1619 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1620 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1621 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1622 | int iter = 0, i; |
1623 | ||
1624 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1625 | if (id_tracker_p) { |
1626 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1627 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1628 | |
f934e302 | 1629 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1630 | if (iter++ >= *pos) |
1631 | return e; | |
1632 | } | |
1633 | } | |
1634 | } else { | |
d1f652f8 | 1635 | /* ID tracker disabled. */ |
7e6f9ef6 | 1636 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1637 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1638 | } |
1639 | iter++; | |
1640 | } | |
1641 | /* End of list */ | |
1642 | return NULL; | |
1643 | } | |
1644 | ||
1645 | /* Called with sessions_mutex held. */ | |
1646 | static | |
d1f652f8 | 1647 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1648 | { |
8c0393c3 MD |
1649 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1650 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1651 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1652 | int iter = 0, i; |
1653 | ||
1654 | (*ppos)++; | |
d1f652f8 MD |
1655 | if (id_tracker_p) { |
1656 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1657 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1658 | |
f934e302 | 1659 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1660 | if (iter++ >= *ppos) |
1661 | return e; | |
1662 | } | |
1663 | } | |
1664 | } else { | |
d1f652f8 | 1665 | /* ID tracker disabled. */ |
7e6f9ef6 | 1666 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1667 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1668 | iter++; |
1669 | } | |
1670 | ||
1671 | /* End of list */ | |
1672 | return NULL; | |
1673 | } | |
1674 | ||
1675 | static | |
d1f652f8 | 1676 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1677 | { |
1678 | mutex_unlock(&sessions_mutex); | |
1679 | } | |
1680 | ||
1681 | static | |
d1f652f8 | 1682 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1683 | { |
8c0393c3 MD |
1684 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1685 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1686 | int id; |
7e6f9ef6 | 1687 | |
d1f652f8 | 1688 | if (p == id_tracker_p) { |
7e6f9ef6 | 1689 | /* Tracker disabled. */ |
d1f652f8 | 1690 | id = -1; |
7e6f9ef6 | 1691 | } else { |
d1f652f8 | 1692 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1693 | |
d1f652f8 MD |
1694 | id = lttng_id_tracker_get_node_id(e); |
1695 | } | |
8c0393c3 | 1696 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1697 | case TRACKER_PID: |
1698 | seq_printf(m, "process { pid = %d; };\n", id); | |
1699 | break; | |
1700 | case TRACKER_VPID: | |
1701 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1702 | break; | |
1703 | case TRACKER_UID: | |
1704 | seq_printf(m, "user { uid = %d; };\n", id); | |
1705 | break; | |
1706 | case TRACKER_VUID: | |
1707 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1708 | break; | |
1709 | case TRACKER_GID: | |
1710 | seq_printf(m, "group { gid = %d; };\n", id); | |
1711 | break; | |
1712 | case TRACKER_VGID: | |
1713 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1714 | break; | |
1715 | default: | |
1716 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1717 | } |
7e6f9ef6 MD |
1718 | return 0; |
1719 | } | |
1720 | ||
1721 | static | |
d1f652f8 MD |
1722 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1723 | .start = id_list_start, | |
1724 | .next = id_list_next, | |
1725 | .stop = id_list_stop, | |
1726 | .show = id_list_show, | |
7e6f9ef6 MD |
1727 | }; |
1728 | ||
1729 | static | |
d1f652f8 | 1730 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1731 | { |
d1f652f8 | 1732 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1733 | } |
1734 | ||
1735 | static | |
d1f652f8 | 1736 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1737 | { |
1738 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1739 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1740 | int ret; |
1741 | ||
d1f652f8 | 1742 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1743 | ret = seq_release(inode, file); |
d1f652f8 | 1744 | if (!ret) |
8c0393c3 | 1745 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1746 | return ret; |
1747 | } | |
1748 | ||
d1f652f8 | 1749 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1750 | .owner = THIS_MODULE, |
d1f652f8 | 1751 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1752 | .read = seq_read, |
1753 | .llseek = seq_lseek, | |
d1f652f8 | 1754 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1755 | }; |
1756 | ||
8cdc1a81 | 1757 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1758 | enum tracker_type tracker_type) |
7e6f9ef6 | 1759 | { |
d1f652f8 | 1760 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1761 | struct seq_file *m; |
1762 | int file_fd, ret; | |
1763 | ||
2a059b14 | 1764 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1765 | if (file_fd < 0) { |
1766 | ret = file_fd; | |
1767 | goto fd_error; | |
1768 | } | |
1769 | ||
d1f652f8 MD |
1770 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1771 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1772 | NULL, O_RDWR); |
d1f652f8 MD |
1773 | if (IS_ERR(tracker_ids_list_file)) { |
1774 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1775 | goto file_error; |
1776 | } | |
8cdc1a81 | 1777 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1778 | ret = -EOVERFLOW; |
9c1f4643 MD |
1779 | goto refcount_error; |
1780 | } | |
d1f652f8 | 1781 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1782 | if (ret < 0) |
1783 | goto open_error; | |
d1f652f8 MD |
1784 | m = tracker_ids_list_file->private_data; |
1785 | ||
1786 | m->private = get_tracker(session, tracker_type); | |
1787 | BUG_ON(!m->private); | |
1788 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1789 | |
1790 | return file_fd; | |
1791 | ||
1792 | open_error: | |
8cdc1a81 | 1793 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1794 | refcount_error: |
d1f652f8 | 1795 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1796 | file_error: |
1797 | put_unused_fd(file_fd); | |
1798 | fd_error: | |
1799 | return ret; | |
1800 | } | |
1801 | ||
3c997079 MD |
1802 | /* |
1803 | * Enabler management. | |
1804 | */ | |
1805 | static | |
4993071a PP |
1806 | int lttng_match_enabler_star_glob(const char *desc_name, |
1807 | const char *pattern) | |
3c997079 | 1808 | { |
cbc19040 MD |
1809 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1810 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1811 | return 0; |
1812 | return 1; | |
1813 | } | |
1814 | ||
1815 | static | |
4ecb5ad5 MD |
1816 | int lttng_match_enabler_name(const char *desc_name, |
1817 | const char *name) | |
3c997079 | 1818 | { |
4ecb5ad5 | 1819 | if (strcmp(desc_name, name)) |
3c997079 MD |
1820 | return 0; |
1821 | return 1; | |
1822 | } | |
1823 | ||
8bff0fc3 MD |
1824 | static |
1825 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1826 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1827 | { |
4ecb5ad5 | 1828 | const char *desc_name, *enabler_name; |
badfe9f5 | 1829 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1830 | |
1831 | enabler_name = enabler->event_param.name; | |
1832 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1833 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1834 | desc_name = desc->event_name; |
3b861b22 FD |
1835 | switch (enabler->format_type) { |
1836 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1837 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1838 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1839 | return lttng_match_enabler_name(desc_name, enabler_name); |
1840 | default: | |
1841 | return -EINVAL; | |
1842 | } | |
4ecb5ad5 | 1843 | break; |
b4a75708 | 1844 | |
606828e4 | 1845 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1846 | desc_name = desc->event_name; |
badfe9f5 | 1847 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1848 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1849 | compat = true; |
1850 | } | |
4ecb5ad5 MD |
1851 | if (!strncmp(desc_name, "syscall_exit_", |
1852 | strlen("syscall_exit_"))) { | |
1853 | desc_name += strlen("syscall_exit_"); | |
1854 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1855 | strlen("syscall_entry_"))) { | |
1856 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1857 | entry = true; |
4ecb5ad5 MD |
1858 | } else { |
1859 | WARN_ON_ONCE(1); | |
1860 | return -EINVAL; | |
1861 | } | |
badfe9f5 | 1862 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1863 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1864 | break; |
606828e4 | 1865 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1866 | if (!entry) |
1867 | return 0; | |
1868 | break; | |
606828e4 | 1869 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1870 | if (entry) |
1871 | return 0; | |
1872 | break; | |
1873 | default: | |
1874 | return -EINVAL; | |
1875 | } | |
1876 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1877 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1878 | break; |
606828e4 | 1879 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1880 | if (compat) |
1881 | return 0; | |
1882 | break; | |
606828e4 | 1883 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1884 | if (!compat) |
1885 | return 0; | |
1886 | break; | |
1887 | default: | |
1888 | return -EINVAL; | |
1889 | } | |
1890 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1891 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1892 | switch (enabler->format_type) { |
1893 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1894 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1895 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1896 | return lttng_match_enabler_name(desc_name, enabler_name); |
1897 | default: | |
1898 | return -EINVAL; | |
1899 | } | |
1900 | break; | |
606828e4 | 1901 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1902 | return -EINVAL; /* Not implemented. */ |
1903 | default: | |
1904 | return -EINVAL; | |
1905 | } | |
4ecb5ad5 | 1906 | break; |
b4a75708 | 1907 | |
4ecb5ad5 MD |
1908 | default: |
1909 | WARN_ON_ONCE(1); | |
1910 | return -EINVAL; | |
1911 | } | |
3c997079 MD |
1912 | } |
1913 | ||
8bff0fc3 MD |
1914 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1915 | struct lttng_event_enabler_common *enabler) | |
1916 | { | |
1917 | int ret; | |
1918 | ||
1919 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1920 | if (ret < 0) { | |
1921 | WARN_ON_ONCE(1); | |
1922 | return false; | |
1923 | } | |
1924 | return ret; | |
1925 | } | |
1926 | ||
5c6ec66a MD |
1927 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1928 | struct lttng_kernel_event_common *event) | |
3c997079 | 1929 | { |
5c6ec66a MD |
1930 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1931 | return false; | |
b2bc0bc8 | 1932 | |
5c6ec66a MD |
1933 | switch (event_enabler->enabler_type) { |
1934 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1935 | { | |
1936 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1937 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1938 | struct lttng_kernel_event_recorder *event_recorder = | |
1939 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1940 | ||
1941 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1942 | && event_recorder->chan == event_recorder_enabler->chan) | |
1943 | return true; | |
1944 | else | |
1945 | return false; | |
1946 | } | |
1947 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1948 | { | |
1949 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1950 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1951 | struct lttng_kernel_event_notifier *event_notifier = | |
1952 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1953 | ||
1954 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1955 | && event_notifier->priv->group == event_notifier_enabler->group | |
1956 | && event->priv->user_token == event_enabler->user_token) | |
1957 | return true; | |
1958 | else | |
1959 | return false; | |
1960 | } | |
1961 | default: | |
1962 | WARN_ON_ONCE(1); | |
1963 | return false; | |
1964 | } | |
3c997079 MD |
1965 | } |
1966 | ||
5c6ec66a MD |
1967 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1968 | const struct lttng_kernel_event_desc *desc, | |
1969 | struct lttng_kernel_event_common *event) | |
b01155ba | 1970 | { |
5c6ec66a MD |
1971 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1972 | return false; | |
b01155ba | 1973 | |
5c6ec66a MD |
1974 | switch (event_enabler->enabler_type) { |
1975 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1976 | { | |
1977 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1978 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1979 | struct lttng_kernel_event_recorder *event_recorder = | |
1980 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1981 | ||
1982 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1983 | return true; | |
1984 | else | |
1985 | return false; | |
1986 | } | |
1987 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1988 | { | |
1989 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1990 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1991 | struct lttng_kernel_event_notifier *event_notifier = | |
1992 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1993 | ||
1994 | if (event->priv->desc == desc | |
1995 | && event_notifier->priv->group == event_notifier_enabler->group | |
1996 | && event->priv->user_token == event_enabler->user_token) | |
1997 | return true; | |
1998 | else | |
1999 | return false; | |
2000 | } | |
2001 | default: | |
2002 | WARN_ON_ONCE(1); | |
2003 | return false; | |
2004 | } | |
b01155ba FD |
2005 | } |
2006 | ||
0d223dc6 MD |
2007 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2008 | const char *event_name, | |
2009 | struct lttng_kernel_event_common *event) | |
2010 | { | |
2011 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2012 | return false; | |
2013 | ||
2014 | switch (event_enabler->enabler_type) { | |
2015 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2016 | { | |
2017 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2018 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2019 | struct lttng_kernel_event_recorder *event_recorder = | |
2020 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2021 | ||
2022 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2023 | && event_recorder->chan == event_recorder_enabler->chan) | |
2024 | return true; | |
2025 | else | |
2026 | return false; | |
2027 | } | |
2028 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2029 | { | |
2030 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2031 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2032 | struct lttng_kernel_event_notifier *event_notifier = | |
2033 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2034 | ||
2035 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2036 | && event_notifier->priv->group == event_notifier_enabler->group | |
2037 | && event->priv->user_token == event_enabler->user_token) | |
2038 | return true; | |
2039 | else | |
2040 | return false; | |
2041 | } | |
2042 | default: | |
2043 | WARN_ON_ONCE(1); | |
2044 | return false; | |
2045 | } | |
2046 | } | |
2047 | ||
3c997079 | 2048 | static |
b2bc0bc8 FD |
2049 | struct lttng_enabler_ref *lttng_enabler_ref( |
2050 | struct list_head *enablers_ref_list, | |
8d554755 | 2051 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2052 | { |
2053 | struct lttng_enabler_ref *enabler_ref; | |
2054 | ||
b2bc0bc8 | 2055 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2056 | if (enabler_ref->ref == enabler) |
2057 | return enabler_ref; | |
2058 | } | |
2059 | return NULL; | |
2060 | } | |
2061 | ||
3c997079 | 2062 | static |
b2f63bde | 2063 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2064 | { |
c8e14380 | 2065 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2066 | struct lttng_kernel_probe_desc *probe_desc; |
2067 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2068 | struct list_head *probe_list; |
c8e14380 | 2069 | int i; |
3c997079 MD |
2070 | |
2071 | probe_list = lttng_get_probe_list_head(); | |
2072 | /* | |
2073 | * For each probe event, if we find that a probe event matches | |
2074 | * our enabler, create an associated lttng_event if not | |
2075 | * already present. | |
2076 | */ | |
2077 | list_for_each_entry(probe_desc, probe_list, head) { | |
2078 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2079 | bool found = false; |
3c997079 | 2080 | struct hlist_head *head; |
83006ee0 | 2081 | struct lttng_kernel_event_common *event; |
19bef247 | 2082 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2083 | |
2084 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2085 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2086 | continue; |
3c997079 MD |
2087 | |
2088 | /* | |
2089 | * Check if already created. | |
2090 | */ | |
0def9170 | 2091 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2092 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2093 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2094 | found = true; | |
2095 | break; | |
2096 | } | |
3c997079 MD |
2097 | } |
2098 | if (found) | |
2099 | continue; | |
2100 | ||
2101 | /* | |
83006ee0 | 2102 | * We need to create an event for this event probe. |
3c997079 | 2103 | */ |
c8e14380 | 2104 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2105 | if (IS_ERR(event)) { |
5a15f70c | 2106 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2107 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2108 | } |
2109 | } | |
2110 | } | |
2111 | } | |
2112 | ||
33a39a3c | 2113 | /* |
8839618b | 2114 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2115 | * Should be called with sessions mutex held. |
2116 | */ | |
2117 | static | |
b2f63bde | 2118 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2119 | { |
b2f63bde MD |
2120 | int ret; |
2121 | ||
8839618b | 2122 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2123 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2124 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2125 | break; |
b4a75708 | 2126 | |
606828e4 | 2127 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2128 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2129 | WARN_ON_ONCE(ret); | |
33a39a3c | 2130 | break; |
b4a75708 | 2131 | |
33a39a3c MD |
2132 | default: |
2133 | WARN_ON_ONCE(1); | |
2134 | break; | |
2135 | } | |
2136 | } | |
2137 | ||
d619fae9 MD |
2138 | static |
2139 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2140 | struct lttng_kernel_event_common *event) | |
2141 | { | |
2142 | /* Link filter bytecodes if not linked yet. */ | |
2143 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2144 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2145 | } | |
2146 | ||
1e06b222 MD |
2147 | static |
2148 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2149 | struct lttng_kernel_event_common *event) | |
2150 | { | |
2151 | switch (event_enabler->enabler_type) { | |
2152 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2153 | break; | |
2154 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2155 | { | |
2156 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2157 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2158 | struct lttng_kernel_event_notifier *event_notifier = | |
2159 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2160 | ||
2161 | /* Link capture bytecodes if not linked yet. */ | |
2162 | lttng_enabler_link_bytecode(event->priv->desc, | |
2163 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2164 | &event_notifier_enabler->capture_bytecode_head); | |
2165 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2166 | break; | |
2167 | } | |
2168 | default: | |
2169 | WARN_ON_ONCE(1); | |
2170 | } | |
2171 | } | |
2172 | ||
3c997079 | 2173 | /* |
b2bc0bc8 | 2174 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2175 | * and add backward reference from the event to the enabler. |
2176 | * Should be called with sessions mutex held. | |
2177 | */ | |
2178 | static | |
3622cd47 | 2179 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2180 | { |
3622cd47 MD |
2181 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2182 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2183 | |
3622cd47 | 2184 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2185 | |
3c997079 | 2186 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2187 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2188 | |
3622cd47 MD |
2189 | /* Link the created event with its associated enabler. */ |
2190 | list_for_each_entry(event_priv, event_list_head, node) { | |
2191 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2192 | struct lttng_enabler_ref *enabler_ref; |
2193 | ||
3622cd47 | 2194 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2195 | continue; |
2196 | ||
3622cd47 | 2197 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2198 | if (!enabler_ref) { |
2199 | /* | |
2200 | * If no backward ref, create it. | |
2201 | * Add backward ref from event_notifier to enabler. | |
2202 | */ | |
2203 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2204 | if (!enabler_ref) | |
2205 | return -ENOMEM; | |
2206 | ||
3622cd47 MD |
2207 | enabler_ref->ref = event_enabler; |
2208 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2209 | } |
2210 | ||
3622cd47 MD |
2211 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2212 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2213 | } |
2214 | return 0; | |
2215 | } | |
2216 | ||
3c997079 MD |
2217 | /* |
2218 | * Called at module load: connect the probe on all enablers matching | |
2219 | * this event. | |
2220 | * Called with sessions lock held. | |
2221 | */ | |
2222 | int lttng_fix_pending_events(void) | |
2223 | { | |
8cdc1a81 | 2224 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2225 | |
8cdc1a81 MD |
2226 | list_for_each_entry(session_priv, &sessions, list) |
2227 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2228 | return 0; |
2229 | } | |
2230 | ||
b01155ba FD |
2231 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2232 | struct lttng_event_notifier_group *event_notifier_group) | |
2233 | { | |
09710b83 | 2234 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2235 | |
09710b83 MD |
2236 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2237 | if (event_enabler->enabled) | |
b01155ba FD |
2238 | return true; |
2239 | } | |
2240 | return false; | |
2241 | } | |
2242 | ||
2243 | bool lttng_event_notifier_active(void) | |
2244 | { | |
2245 | struct lttng_event_notifier_group *event_notifier_group; | |
2246 | ||
2247 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2248 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2249 | return true; | |
2250 | } | |
2251 | return false; | |
2252 | } | |
2253 | ||
2254 | int lttng_fix_pending_event_notifiers(void) | |
2255 | { | |
2256 | struct lttng_event_notifier_group *event_notifier_group; | |
2257 | ||
2258 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2259 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2260 | return 0; | |
2261 | } | |
2262 | ||
1ae083ba | 2263 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2264 | enum lttng_enabler_format_type format_type, |
606828e4 | 2265 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2266 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2267 | { |
1ae083ba | 2268 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2269 | |
b2bc0bc8 FD |
2270 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2271 | if (!event_enabler) | |
3c997079 | 2272 | return NULL; |
0bb716a8 | 2273 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2274 | event_enabler->parent.format_type = format_type; |
2275 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2276 | memcpy(&event_enabler->parent.event_param, event_param, | |
2277 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2278 | event_enabler->chan = chan; |
3c997079 | 2279 | /* ctx left NULL */ |
5b9817ae | 2280 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2281 | return event_enabler; |
2282 | } | |
2283 | ||
2284 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2285 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2286 | { |
3c997079 | 2287 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2288 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2289 | event_enabler->parent.published = true; | |
def1e304 | 2290 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2291 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2292 | } |
2293 | ||
7b25ab0e | 2294 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2295 | { |
2296 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2297 | event_enabler->enabled = 1; |
2298 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2299 | mutex_unlock(&sessions_mutex); |
2300 | return 0; | |
2301 | } | |
2302 | ||
7b25ab0e | 2303 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2304 | { |
2305 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2306 | event_enabler->enabled = 0; |
2307 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2308 | mutex_unlock(&sessions_mutex); |
2309 | return 0; | |
2310 | } | |
2311 | ||
b2bc0bc8 | 2312 | static |
8d554755 | 2313 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2314 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2315 | { |
d64ca521 | 2316 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2317 | uint32_t bytecode_len; |
2318 | int ret; | |
2319 | ||
2320 | ret = get_user(bytecode_len, &bytecode->len); | |
2321 | if (ret) | |
2322 | return ret; | |
52cfcdf3 | 2323 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2324 | GFP_KERNEL); |
2325 | if (!bytecode_node) | |
2326 | return -ENOMEM; | |
2327 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2328 | sizeof(*bytecode) + bytecode_len); | |
2329 | if (ret) | |
2330 | goto error_free; | |
b2bc0bc8 | 2331 | |
8a445457 | 2332 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2333 | bytecode_node->enabler = enabler; |
2334 | /* Enforce length based on allocated size */ | |
2335 | bytecode_node->bc.len = bytecode_len; | |
2336 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2337 | |
07dfc1d0 MD |
2338 | return 0; |
2339 | ||
2340 | error_free: | |
52cfcdf3 | 2341 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2342 | return ret; |
2343 | } | |
2344 | ||
6048044f | 2345 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2346 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2347 | { |
2348 | int ret; | |
6048044f | 2349 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2350 | if (ret) |
2351 | goto error; | |
7b25ab0e | 2352 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2353 | return 0; |
2354 | ||
2355 | error: | |
2356 | return ret; | |
2357 | } | |
2358 | ||
e2d5dbc7 | 2359 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2360 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2361 | { |
2362 | ||
e2d5dbc7 | 2363 | switch (event->priv->instrumentation) { |
606828e4 | 2364 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2365 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2366 | default: |
2367 | return -EINVAL; | |
2368 | } | |
2369 | } | |
2370 | ||
3c997079 | 2371 | static |
8d554755 | 2372 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2373 | { |
d64ca521 | 2374 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2375 | |
2376 | /* Destroy filter bytecode */ | |
2377 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2378 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2379 | lttng_kvfree(filter_node); |
07dfc1d0 | 2380 | } |
b2bc0bc8 FD |
2381 | } |
2382 | ||
44b1abdc | 2383 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2384 | { |
09710b83 MD |
2385 | lttng_enabler_destroy(event_enabler); |
2386 | if (event_enabler->published) | |
2387 | list_del(&event_enabler->node); | |
2388 | ||
44b1abdc MD |
2389 | switch (event_enabler->enabler_type) { |
2390 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2391 | { | |
2392 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2393 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2394 | ||
44b1abdc MD |
2395 | kfree(event_recorder_enabler); |
2396 | break; | |
2397 | } | |
2398 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2399 | { | |
2400 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2401 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2402 | |
44b1abdc MD |
2403 | kfree(event_notifier_enabler); |
2404 | break; | |
2405 | } | |
2406 | default: | |
2407 | WARN_ON_ONCE(1); | |
2408 | } | |
3c997079 MD |
2409 | } |
2410 | ||
dffef45d | 2411 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2412 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2413 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2414 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2415 | { |
2416 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2417 | ||
2418 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2419 | if (!event_notifier_enabler) | |
2420 | return NULL; | |
2421 | ||
0bb716a8 | 2422 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2423 | event_notifier_enabler->parent.format_type = format_type; |
2424 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2425 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2426 | ||
99f52fcc | 2427 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2428 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2429 | |
5b9817ae MD |
2430 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2431 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2432 | |
5b9817ae MD |
2433 | event_notifier_enabler->parent.enabled = 0; |
2434 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2435 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2436 | return event_notifier_enabler; |
2437 | } | |
dffef45d | 2438 | |
1bbb5b2d MD |
2439 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2440 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2441 | { | |
dffef45d | 2442 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2443 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2444 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2445 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2446 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2447 | } |
2448 | ||
2449 | int lttng_event_notifier_enabler_enable( | |
2450 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2451 | { | |
2452 | mutex_lock(&sessions_mutex); | |
2453 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2454 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2455 | mutex_unlock(&sessions_mutex); |
2456 | return 0; | |
2457 | } | |
2458 | ||
2459 | int lttng_event_notifier_enabler_disable( | |
2460 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2461 | { | |
2462 | mutex_lock(&sessions_mutex); | |
2463 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2464 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2465 | mutex_unlock(&sessions_mutex); |
2466 | return 0; | |
2467 | } | |
2468 | ||
99d223ad FD |
2469 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2470 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2471 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2472 | { |
d64ca521 | 2473 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2474 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2475 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2476 | uint32_t bytecode_len; | |
2477 | int ret; | |
2478 | ||
2479 | ret = get_user(bytecode_len, &bytecode->len); | |
2480 | if (ret) | |
2481 | return ret; | |
2482 | ||
2483 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2484 | GFP_KERNEL); | |
2485 | if (!bytecode_node) | |
2486 | return -ENOMEM; | |
2487 | ||
2488 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2489 | sizeof(*bytecode) + bytecode_len); | |
2490 | if (ret) | |
2491 | goto error_free; | |
2492 | ||
8a445457 | 2493 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2494 | bytecode_node->enabler = enabler; |
2495 | ||
2496 | /* Enforce length based on allocated size */ | |
2497 | bytecode_node->bc.len = bytecode_len; | |
2498 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2499 | ||
2500 | event_notifier_enabler->num_captures++; | |
2501 | ||
2502 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2503 | goto end; | |
2504 | ||
2505 | error_free: | |
2506 | lttng_kvfree(bytecode_node); | |
2507 | end: | |
2508 | return ret; | |
2509 | } | |
2510 | ||
cc5719b1 MD |
2511 | static |
2512 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2513 | { | |
2514 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2515 | struct lttng_kernel_bytecode_runtime *runtime; | |
2516 | struct lttng_enabler_ref *enabler_ref; | |
2517 | ||
2518 | /* Check if has enablers without bytecode enabled */ | |
2519 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2520 | if (enabler_ref->ref->enabled | |
2521 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2522 | has_enablers_without_filter_bytecode = 1; | |
2523 | break; | |
2524 | } | |
2525 | } | |
2526 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2527 | ||
2528 | /* Enable filters */ | |
2529 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2530 | lttng_bytecode_sync_state(runtime); | |
2531 | nr_filters++; | |
2532 | } | |
2533 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2534 | } | |
2535 | ||
2536 | static | |
2537 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2538 | { | |
2539 | switch (event->type) { | |
2540 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2541 | break; | |
2542 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2543 | { | |
2544 | struct lttng_kernel_event_notifier *event_notifier = | |
2545 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2546 | struct lttng_kernel_bytecode_runtime *runtime; | |
2547 | int nr_captures = 0; | |
2548 | ||
2549 | /* Enable captures */ | |
2550 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2551 | lttng_bytecode_sync_state(runtime); | |
2552 | nr_captures++; | |
2553 | } | |
2554 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2555 | break; | |
2556 | } | |
2557 | default: | |
2558 | WARN_ON_ONCE(1); | |
2559 | } | |
2560 | } | |
2561 | ||
a0c6ad2e MD |
2562 | static |
2563 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2564 | { | |
2565 | struct lttng_enabler_ref *enabler_ref; | |
2566 | bool enabled = false; | |
2567 | ||
2568 | switch (event->priv->instrumentation) { | |
2569 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2570 | lttng_fallthrough; | |
2571 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2572 | /* Enable events */ | |
2573 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2574 | if (enabler_ref->ref->enabled) { | |
2575 | enabled = true; | |
2576 | break; | |
2577 | } | |
2578 | } | |
2579 | break; | |
2580 | default: | |
2581 | WARN_ON_ONCE(1); | |
2582 | return false; | |
2583 | } | |
2584 | ||
2585 | switch (event->type) { | |
2586 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2587 | { | |
2588 | struct lttng_kernel_event_recorder *event_recorder = | |
2589 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2590 | ||
2591 | /* | |
2592 | * Enabled state is based on union of enablers, with | |
2593 | * intersection of session and channel transient enable | |
2594 | * states. | |
2595 | */ | |
2596 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2597 | } | |
2598 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2599 | return enabled; | |
2600 | default: | |
2601 | WARN_ON_ONCE(1); | |
2602 | return false; | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | static | |
2607 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2608 | { | |
2609 | switch (event->priv->instrumentation) { | |
2610 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2611 | lttng_fallthrough; | |
2612 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2613 | return true; | |
2614 | ||
2615 | default: | |
2616 | /* Not handled with lazy sync. */ | |
2617 | return false; | |
2618 | } | |
2619 | } | |
2620 | ||
3c997079 | 2621 | /* |
3c997079 MD |
2622 | * Should be called with sessions mutex held. |
2623 | */ | |
2624 | static | |
a0c6ad2e MD |
2625 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2626 | struct list_head *event_list) | |
3c997079 | 2627 | { |
a0c6ad2e | 2628 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2629 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2630 | |
a0c6ad2e | 2631 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2632 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2633 | |
3c997079 MD |
2634 | /* |
2635 | * For each event, if at least one of its enablers is enabled, | |
2636 | * and its channel and session transient states are enabled, we | |
2637 | * enable the event, else we disable it. | |
2638 | */ | |
a0c6ad2e MD |
2639 | list_for_each_entry(event_priv, event_list, node) { |
2640 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2641 | bool enabled; | |
b4a75708 | 2642 | |
a0c6ad2e | 2643 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2644 | continue; |
3c997079 | 2645 | |
a0c6ad2e MD |
2646 | enabled = lttng_get_event_enabled_state(event); |
2647 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2648 | /* |
a0c6ad2e | 2649 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2650 | */ |
2651 | if (enabled) { | |
6a338ba4 MD |
2652 | if (!event_priv->registered) |
2653 | register_event(event); | |
3c997079 | 2654 | } else { |
6a338ba4 MD |
2655 | if (event_priv->registered) |
2656 | unregister_event(event); | |
3c997079 | 2657 | } |
07dfc1d0 | 2658 | |
a0c6ad2e MD |
2659 | lttng_event_sync_filter_state(event); |
2660 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2661 | } |
2662 | } | |
2663 | ||
a0c6ad2e MD |
2664 | /* |
2665 | * lttng_session_sync_event_enablers should be called just before starting a | |
2666 | * session. | |
2667 | */ | |
2668 | static | |
2669 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2670 | { | |
2671 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2672 | } | |
2673 | ||
3c997079 MD |
2674 | /* |
2675 | * Apply enablers to session events, adding events to session if need | |
2676 | * be. It is required after each modification applied to an active | |
2677 | * session, and right before session "start". | |
2678 | * "lazy" sync means we only sync if required. | |
2679 | * Should be called with sessions mutex held. | |
2680 | */ | |
2681 | static | |
8cdc1a81 | 2682 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2683 | { |
2684 | /* We can skip if session is not active */ | |
2685 | if (!session->active) | |
2686 | return; | |
b2bc0bc8 | 2687 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2688 | } |
2689 | ||
b01155ba FD |
2690 | static |
2691 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2692 | { | |
a0c6ad2e | 2693 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2694 | } |
2695 | ||
7b25ab0e MD |
2696 | static |
2697 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2698 | { | |
2699 | switch (event_enabler->enabler_type) { | |
2700 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2701 | { | |
2702 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2703 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2704 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2705 | break; | |
2706 | } | |
2707 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2708 | { | |
2709 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2710 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2711 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2712 | break; | |
2713 | } | |
2714 | default: | |
2715 | WARN_ON_ONCE(1); | |
2716 | } | |
2717 | } | |
2718 | ||
1ec3f75a | 2719 | /* |
d83004aa JD |
2720 | * Serialize at most one packet worth of metadata into a metadata |
2721 | * channel. | |
92d9f5e6 MD |
2722 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2723 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2724 | * allows us to do racy operations such as looking for remaining space left in | |
2725 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2726 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2727 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2728 | * Returns the number of bytes written in the channel, 0 if no data |
2729 | * was written and a negative value on error. | |
1ec3f75a | 2730 | */ |
b3b8072b | 2731 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2732 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2733 | { |
8a57ec02 | 2734 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2735 | int ret = 0; |
2736 | size_t len, reserve_len; | |
2737 | ||
f613e3e6 | 2738 | /* |
92d9f5e6 MD |
2739 | * Ensure we support mutiple get_next / put sequences followed by |
2740 | * put_next. The metadata cache lock protects reading the metadata | |
2741 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2742 | * "flush" operations on the buffer invoked by different processes. | |
2743 | * Moreover, since the metadata cache memory can be reallocated, we | |
2744 | * need to have exclusive access against updates even though we only | |
2745 | * read it. | |
f613e3e6 | 2746 | */ |
92d9f5e6 | 2747 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2748 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2749 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2750 | goto end; |
f613e3e6 | 2751 | |
9616f0bf JD |
2752 | /* Metadata regenerated, change the version. */ |
2753 | if (stream->metadata_cache->version != stream->version) | |
2754 | stream->version = stream->metadata_cache->version; | |
2755 | ||
d83004aa | 2756 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2757 | stream->metadata_in; |
9de2c215 | 2758 | if (!len) |
de23d59d | 2759 | goto end; |
d83004aa | 2760 | reserve_len = min_t(size_t, |
4a399b76 | 2761 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2762 | len); |
a775608d | 2763 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2764 | sizeof(char), NULL); |
d83004aa JD |
2765 | /* |
2766 | * If reservation failed, return an error to the caller. | |
2767 | */ | |
c2fb9c1c | 2768 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2769 | if (ret != 0) { |
2770 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2771 | stream->coherent = false; |
d83004aa JD |
2772 | goto end; |
2773 | } | |
b3b8072b | 2774 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2775 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2776 | reserve_len, 1); |
b3b8072b | 2777 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2778 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2779 | if (reserve_len < len) |
8b97fd42 MD |
2780 | stream->coherent = false; |
2781 | else | |
2782 | stream->coherent = true; | |
d83004aa JD |
2783 | ret = reserve_len; |
2784 | ||
2785 | end: | |
8b97fd42 MD |
2786 | if (coherent) |
2787 | *coherent = stream->coherent; | |
92d9f5e6 | 2788 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2789 | return ret; |
2790 | } | |
2791 | ||
8b97fd42 | 2792 | static |
8cdc1a81 | 2793 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2794 | { |
8cdc1a81 MD |
2795 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2796 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2797 | } |
2798 | ||
2799 | static | |
8cdc1a81 | 2800 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2801 | { |
8cdc1a81 MD |
2802 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2803 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2804 | struct lttng_metadata_stream *stream; |
2805 | ||
8cdc1a81 | 2806 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2807 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2808 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2809 | } |
8b97fd42 MD |
2810 | } |
2811 | ||
d83004aa JD |
2812 | /* |
2813 | * Write the metadata to the metadata cache. | |
2814 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2815 | * The metadata cache lock protects us from concurrent read access from |
2816 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2817 | * The content of the printf is printed as a single atomic metadata |
2818 | * transaction. | |
d83004aa | 2819 | */ |
8cdc1a81 | 2820 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2821 | const char *fmt, ...) |
2822 | { | |
c099397a | 2823 | char *str; |
d83004aa | 2824 | size_t len; |
c099397a MD |
2825 | va_list ap; |
2826 | ||
585e5dcc | 2827 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2828 | |
2829 | va_start(ap, fmt); | |
2830 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2831 | va_end(ap); | |
2832 | if (!str) | |
2833 | return -ENOMEM; | |
2834 | ||
1ec3f75a | 2835 | len = strlen(str); |
8cdc1a81 MD |
2836 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2837 | if (session->priv->metadata_cache->metadata_written + len > | |
2838 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2839 | char *tmp_cache_realloc; |
2840 | unsigned int tmp_cache_alloc_size; | |
2841 | ||
2842 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2843 | session->priv->metadata_cache->cache_alloc + len, |
2844 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2845 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2846 | if (!tmp_cache_realloc) |
2847 | goto err; | |
8cdc1a81 | 2848 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2849 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2850 | session->priv->metadata_cache->data, |
2851 | session->priv->metadata_cache->cache_alloc); | |
2852 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2853 | } |
2854 | ||
8cdc1a81 MD |
2855 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2856 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2857 | } |
8cdc1a81 MD |
2858 | memcpy(session->priv->metadata_cache->data + |
2859 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2860 | str, len); |
8cdc1a81 | 2861 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2862 | kfree(str); |
d83004aa | 2863 | |
d83004aa JD |
2864 | return 0; |
2865 | ||
2866 | err: | |
2867 | kfree(str); | |
2868 | return -ENOMEM; | |
c099397a MD |
2869 | } |
2870 | ||
f513b2bf | 2871 | static |
8cdc1a81 | 2872 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2873 | { |
2874 | size_t i; | |
2875 | ||
2876 | for (i = 0; i < nesting; i++) { | |
2877 | int ret; | |
2878 | ||
2879 | ret = lttng_metadata_printf(session, " "); | |
2880 | if (ret) { | |
2881 | return ret; | |
2882 | } | |
2883 | } | |
2884 | return 0; | |
2885 | } | |
2886 | ||
ceabb767 | 2887 | static |
8cdc1a81 | 2888 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2889 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2890 | size_t nesting) |
2891 | { | |
2892 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2893 | } | |
2894 | ||
2895 | static | |
8cdc1a81 | 2896 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2897 | const struct lttng_kernel_type_integer *type, |
2898 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2899 | size_t nesting) |
2900 | { | |
2901 | int ret; | |
2902 | ||
ceabb767 MD |
2903 | ret = print_tabs(session, nesting); |
2904 | if (ret) | |
2905 | return ret; | |
2906 | ret = lttng_metadata_printf(session, | |
2907 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2908 | type->size, |
2909 | type->alignment, | |
2910 | type->signedness, | |
2911 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2912 | ? "none" |
437d5aa5 | 2913 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2914 | ? "UTF8" |
2915 | : "ASCII", | |
437d5aa5 | 2916 | type->base, |
ceabb767 | 2917 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2918 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2919 | #else |
437d5aa5 | 2920 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2921 | #endif |
2922 | ); | |
2923 | return ret; | |
2924 | } | |
2925 | ||
f513b2bf MD |
2926 | /* |
2927 | * Must be called with sessions_mutex held. | |
2928 | */ | |
2929 | static | |
8cdc1a81 | 2930 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2931 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2932 | size_t nesting) |
2933 | { | |
51ef4536 | 2934 | const char *prev_field_name = NULL; |
f513b2bf MD |
2935 | int ret; |
2936 | uint32_t i, nr_fields; | |
ceabb767 MD |
2937 | unsigned int alignment; |
2938 | ||
f513b2bf MD |
2939 | ret = print_tabs(session, nesting); |
2940 | if (ret) | |
2941 | return ret; | |
2942 | ret = lttng_metadata_printf(session, | |
2943 | "struct {\n"); | |
2944 | if (ret) | |
2945 | return ret; | |
437d5aa5 | 2946 | nr_fields = type->nr_fields; |
f513b2bf | 2947 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2948 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2949 | |
437d5aa5 | 2950 | iter_field = type->fields[i]; |
51ef4536 | 2951 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2952 | if (ret) |
2953 | return ret; | |
2954 | } | |
2955 | ret = print_tabs(session, nesting); | |
2956 | if (ret) | |
2957 | return ret; | |
437d5aa5 | 2958 | alignment = type->alignment; |
ceabb767 MD |
2959 | if (alignment) { |
2960 | ret = lttng_metadata_printf(session, | |
2961 | "} align(%u)", | |
2962 | alignment); | |
2963 | } else { | |
2964 | ret = lttng_metadata_printf(session, | |
2965 | "}"); | |
2966 | } | |
f513b2bf MD |
2967 | return ret; |
2968 | } | |
2969 | ||
2970 | /* | |
2971 | * Must be called with sessions_mutex held. | |
2972 | */ | |
2973 | static | |
8cdc1a81 | 2974 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2975 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2976 | size_t nesting) |
2977 | { | |
2978 | int ret; | |
2979 | ||
2980 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2981 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2982 | if (ret) |
2983 | return ret; | |
ceabb767 | 2984 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2985 | } |
2986 | ||
65c85aa6 MD |
2987 | /* |
2988 | * Must be called with sessions_mutex held. | |
2989 | */ | |
2990 | static | |
8cdc1a81 | 2991 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2992 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
2993 | size_t nesting, |
2994 | const char *prev_field_name) | |
65c85aa6 | 2995 | { |
51ef4536 | 2996 | const char *tag_name; |
65c85aa6 MD |
2997 | int ret; |
2998 | uint32_t i, nr_choices; | |
2999 | ||
51ef4536 MD |
3000 | tag_name = type->tag_name; |
3001 | if (!tag_name) | |
3002 | tag_name = prev_field_name; | |
3003 | if (!tag_name) | |
3004 | return -EINVAL; | |
ceabb767 MD |
3005 | /* |
3006 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3007 | */ | |
437d5aa5 | 3008 | if (type->alignment != 0) |
ceabb767 | 3009 | return -EINVAL; |
65c85aa6 MD |
3010 | ret = print_tabs(session, nesting); |
3011 | if (ret) | |
3012 | return ret; | |
3013 | ret = lttng_metadata_printf(session, | |
3014 | "variant <_%s> {\n", | |
51ef4536 | 3015 | tag_name); |
65c85aa6 MD |
3016 | if (ret) |
3017 | return ret; | |
437d5aa5 | 3018 | nr_choices = type->nr_choices; |
65c85aa6 | 3019 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3020 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3021 | |
437d5aa5 | 3022 | iter_field = type->choices[i]; |
51ef4536 | 3023 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3024 | if (ret) |
3025 | return ret; | |
3026 | } | |
3027 | ret = print_tabs(session, nesting); | |
3028 | if (ret) | |
3029 | return ret; | |
3030 | ret = lttng_metadata_printf(session, | |
3031 | "}"); | |
3032 | return ret; | |
3033 | } | |
3034 | ||
3035 | /* | |
3036 | * Must be called with sessions_mutex held. | |
3037 | */ | |
3038 | static | |
8cdc1a81 | 3039 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3040 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3041 | size_t nesting, |
3042 | const char *prev_field_name) | |
65c85aa6 MD |
3043 | { |
3044 | int ret; | |
3045 | ||
3046 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3047 | lttng_kernel_get_type_variant(field->type), nesting, |
3048 | prev_field_name); | |
65c85aa6 MD |
3049 | if (ret) |
3050 | return ret; | |
ceabb767 | 3051 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3052 | } |
3053 | ||
f513b2bf MD |
3054 | /* |
3055 | * Must be called with sessions_mutex held. | |
3056 | */ | |
3057 | static | |
8cdc1a81 | 3058 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3059 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3060 | size_t nesting) |
3061 | { | |
3062 | int ret; | |
437d5aa5 MD |
3063 | const struct lttng_kernel_type_array *array_type; |
3064 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3065 | |
437d5aa5 MD |
3066 | array_type = lttng_kernel_get_type_array(field->type); |
3067 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3068 | |
437d5aa5 | 3069 | if (array_type->alignment) { |
ceabb767 | 3070 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3071 | if (ret) |
3072 | return ret; | |
ceabb767 MD |
3073 | ret = lttng_metadata_printf(session, |
3074 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3075 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3076 | field->name); |
3077 | if (ret) | |
3078 | return ret; | |
3079 | } | |
3080 | /* | |
3081 | * Nested compound types: Only array of structures and variants are | |
3082 | * currently supported. | |
3083 | */ | |
437d5aa5 | 3084 | elem_type = array_type->elem_type; |
12bb2edb MD |
3085 | switch (elem_type->type) { |
3086 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3087 | case lttng_kernel_type_struct: |
3088 | case lttng_kernel_type_variant: | |
3089 | ret = _lttng_type_statedump(session, elem_type, | |
3090 | array_type->encoding, nesting); | |
65c85aa6 MD |
3091 | if (ret) |
3092 | return ret; | |
3093 | break; | |
ceabb767 | 3094 | |
f513b2bf MD |
3095 | default: |
3096 | return -EINVAL; | |
3097 | } | |
3098 | ret = lttng_metadata_printf(session, | |
3099 | " _%s[%u];\n", | |
3100 | field->name, | |
437d5aa5 | 3101 | array_type->length); |
f513b2bf MD |
3102 | return ret; |
3103 | } | |
3104 | ||
3105 | /* | |
3106 | * Must be called with sessions_mutex held. | |
3107 | */ | |
3108 | static | |
8cdc1a81 | 3109 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3110 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3111 | size_t nesting, |
3112 | const char *prev_field_name) | |
f513b2bf MD |
3113 | { |
3114 | int ret; | |
3115 | const char *length_name; | |
437d5aa5 MD |
3116 | const struct lttng_kernel_type_sequence *sequence_type; |
3117 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3118 | |
437d5aa5 MD |
3119 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3120 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3121 | |
437d5aa5 | 3122 | length_name = sequence_type->length_name; |
51ef4536 MD |
3123 | if (!length_name) |
3124 | length_name = prev_field_name; | |
3125 | if (!length_name) | |
3126 | return -EINVAL; | |
ceabb767 | 3127 | |
437d5aa5 | 3128 | if (sequence_type->alignment) { |
ceabb767 | 3129 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3130 | if (ret) |
3131 | return ret; | |
ceabb767 MD |
3132 | ret = lttng_metadata_printf(session, |
3133 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3134 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3135 | field->name); |
3136 | if (ret) | |
3137 | return ret; | |
3138 | } | |
3139 | ||
3140 | /* | |
3141 | * Nested compound types: Only array of structures and variants are | |
3142 | * currently supported. | |
3143 | */ | |
437d5aa5 | 3144 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3145 | switch (elem_type->type) { |
3146 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3147 | case lttng_kernel_type_struct: |
3148 | case lttng_kernel_type_variant: | |
3149 | ret = _lttng_type_statedump(session, elem_type, | |
3150 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3151 | if (ret) |
3152 | return ret; | |
3153 | break; | |
ceabb767 | 3154 | |
f513b2bf MD |
3155 | default: |
3156 | return -EINVAL; | |
3157 | } | |
3158 | ret = lttng_metadata_printf(session, | |
3159 | " _%s[ _%s ];\n", | |
3160 | field->name, | |
51ef4536 | 3161 | length_name); |
f513b2bf MD |
3162 | return ret; |
3163 | } | |
3164 | ||
141ddf28 MD |
3165 | /* |
3166 | * Must be called with sessions_mutex held. | |
3167 | */ | |
3168 | static | |
8cdc1a81 | 3169 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3170 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3171 | size_t nesting) |
3172 | { | |
d96a4a7a | 3173 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3174 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3175 | int ret; |
3176 | unsigned int i, nr_entries; | |
3177 | ||
437d5aa5 | 3178 | container_type = type->container_type; |
12bb2edb | 3179 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3180 | ret = -EINVAL; |
3181 | goto end; | |
3182 | } | |
437d5aa5 | 3183 | enum_desc = type->desc; |
141ddf28 MD |
3184 | nr_entries = enum_desc->nr_entries; |
3185 | ||
3186 | ret = print_tabs(session, nesting); | |
3187 | if (ret) | |
3188 | goto end; | |
ceabb767 MD |
3189 | ret = lttng_metadata_printf(session, "enum : "); |
3190 | if (ret) | |
3191 | goto end; | |
437d5aa5 MD |
3192 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3193 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3194 | if (ret) |
ceabb767 MD |
3195 | goto end; |
3196 | ret = lttng_metadata_printf(session, " {\n"); | |
3197 | if (ret) | |
3198 | goto end; | |
141ddf28 MD |
3199 | /* Dump all entries */ |
3200 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3201 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3202 | int j, len; |
3203 | ||
3204 | ret = print_tabs(session, nesting + 1); | |
3205 | if (ret) | |
3206 | goto end; | |
3207 | ret = lttng_metadata_printf(session, | |
3208 | "\""); | |
3209 | if (ret) | |
3210 | goto end; | |
3211 | len = strlen(entry->string); | |
3212 | /* Escape the character '"' */ | |
3213 | for (j = 0; j < len; j++) { | |
3214 | char c = entry->string[j]; | |
3215 | ||
3216 | switch (c) { | |
3217 | case '"': | |
3218 | ret = lttng_metadata_printf(session, | |
3219 | "\\\""); | |
3220 | break; | |
3221 | case '\\': | |
3222 | ret = lttng_metadata_printf(session, | |
3223 | "\\\\"); | |
3224 | break; | |
3225 | default: | |
3226 | ret = lttng_metadata_printf(session, | |
3227 | "%c", c); | |
3228 | break; | |
3229 | } | |
3230 | if (ret) | |
3231 | goto end; | |
3232 | } | |
08ad1061 PP |
3233 | ret = lttng_metadata_printf(session, "\""); |
3234 | if (ret) | |
3235 | goto end; | |
3236 | ||
3237 | if (entry->options.is_auto) { | |
3238 | ret = lttng_metadata_printf(session, ",\n"); | |
3239 | if (ret) | |
3240 | goto end; | |
141ddf28 | 3241 | } else { |
7c559490 MD |
3242 | ret = lttng_metadata_printf(session, |
3243 | " = "); | |
3244 | if (ret) | |
3245 | goto end; | |
3246 | if (entry->start.signedness) | |
141ddf28 | 3247 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3248 | "%lld", (long long) entry->start.value); |
3249 | else | |
3250 | ret = lttng_metadata_printf(session, | |
3251 | "%llu", entry->start.value); | |
3252 | if (ret) | |
3253 | goto end; | |
3254 | if (entry->start.signedness == entry->end.signedness && | |
3255 | entry->start.value | |
3256 | == entry->end.value) { | |
141ddf28 | 3257 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3258 | ",\n"); |
3259 | } else { | |
3260 | if (entry->end.signedness) { | |
3261 | ret = lttng_metadata_printf(session, | |
3262 | " ... %lld,\n", | |
3263 | (long long) entry->end.value); | |
3264 | } else { | |
3265 | ret = lttng_metadata_printf(session, | |
3266 | " ... %llu,\n", | |
3267 | entry->end.value); | |
3268 | } | |
141ddf28 | 3269 | } |
7c559490 MD |
3270 | if (ret) |
3271 | goto end; | |
141ddf28 | 3272 | } |
141ddf28 MD |
3273 | } |
3274 | ret = print_tabs(session, nesting); | |
3275 | if (ret) | |
3276 | goto end; | |
ceabb767 | 3277 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3278 | end: |
3279 | return ret; | |
3280 | } | |
3281 | ||
d83004aa JD |
3282 | /* |
3283 | * Must be called with sessions_mutex held. | |
3284 | */ | |
c099397a | 3285 | static |
8cdc1a81 | 3286 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3287 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3288 | size_t nesting) |
3289 | { | |
3290 | int ret; | |
437d5aa5 | 3291 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3292 | |
437d5aa5 MD |
3293 | enum_type = lttng_kernel_get_type_enum(field->type); |
3294 | WARN_ON_ONCE(!enum_type); | |
3295 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3296 | if (ret) |
3297 | return ret; | |
3298 | return lttng_field_name_statedump(session, field, nesting); | |
3299 | } | |
3300 | ||
3301 | static | |
8cdc1a81 | 3302 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3303 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3304 | size_t nesting) |
3305 | { | |
3306 | int ret; | |
3307 | ||
437d5aa5 MD |
3308 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3309 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3310 | if (ret) |
3311 | return ret; | |
3312 | return lttng_field_name_statedump(session, field, nesting); | |
3313 | } | |
3314 | ||
3315 | static | |
8cdc1a81 | 3316 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3317 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3318 | size_t nesting) |
3319 | { | |
3320 | int ret; | |
3321 | ||
ceabb767 MD |
3322 | /* Default encoding is UTF8 */ |
3323 | ret = print_tabs(session, nesting); | |
3324 | if (ret) | |
3325 | return ret; | |
3326 | ret = lttng_metadata_printf(session, | |
3327 | "string%s", | |
437d5aa5 | 3328 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3329 | " { encoding = ASCII; }" : ""); |
3330 | return ret; | |
3331 | } | |
3332 | ||
3333 | static | |
8cdc1a81 | 3334 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3335 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3336 | size_t nesting) |
ceabb767 | 3337 | { |
437d5aa5 | 3338 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3339 | int ret; |
3340 | ||
437d5aa5 MD |
3341 | string_type = lttng_kernel_get_type_string(field->type); |
3342 | WARN_ON_ONCE(!string_type); | |
3343 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3344 | if (ret) |
3345 | return ret; | |
3346 | return lttng_field_name_statedump(session, field, nesting); | |
3347 | } | |
3348 | ||
3349 | /* | |
3350 | * Must be called with sessions_mutex held. | |
3351 | */ | |
3352 | static | |
8cdc1a81 | 3353 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3354 | const struct lttng_kernel_type_common *type, |
3355 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3356 | size_t nesting) |
c099397a | 3357 | { |
c099397a | 3358 | int ret = 0; |
c099397a | 3359 | |
12bb2edb MD |
3360 | switch (type->type) { |
3361 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3362 | ret = _lttng_integer_type_statedump(session, |
3363 | lttng_kernel_get_type_integer(type), | |
3364 | parent_encoding, nesting); | |
8070f5c0 | 3365 | break; |
437d5aa5 MD |
3366 | case lttng_kernel_type_enum: |
3367 | ret = _lttng_enum_type_statedump(session, | |
3368 | lttng_kernel_get_type_enum(type), | |
3369 | nesting); | |
8070f5c0 | 3370 | break; |
12bb2edb | 3371 | case lttng_kernel_type_string: |
437d5aa5 MD |
3372 | ret = _lttng_string_type_statedump(session, |
3373 | lttng_kernel_get_type_string(type), | |
3374 | nesting); | |
ceabb767 | 3375 | break; |
437d5aa5 MD |
3376 | case lttng_kernel_type_struct: |
3377 | ret = _lttng_struct_type_statedump(session, | |
3378 | lttng_kernel_get_type_struct(type), | |
3379 | nesting); | |
8070f5c0 | 3380 | break; |
437d5aa5 MD |
3381 | case lttng_kernel_type_variant: |
3382 | ret = _lttng_variant_type_statedump(session, | |
3383 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3384 | nesting, NULL); |
ceabb767 MD |
3385 | break; |
3386 | ||
3387 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3388 | case lttng_kernel_type_array: |
3389 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3390 | default: |
3391 | WARN_ON_ONCE(1); | |
3392 | return -EINVAL; | |
8070f5c0 | 3393 | } |
ceabb767 MD |
3394 | return ret; |
3395 | } | |
8070f5c0 | 3396 | |
ceabb767 MD |
3397 | /* |
3398 | * Must be called with sessions_mutex held. | |
3399 | */ | |
3400 | static | |
8cdc1a81 | 3401 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3402 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3403 | size_t nesting, |
3404 | const char **prev_field_name_p) | |
ceabb767 | 3405 | { |
51ef4536 | 3406 | const char *prev_field_name = NULL; |
ceabb767 | 3407 | int ret = 0; |
27d2368e | 3408 | |
51ef4536 MD |
3409 | if (prev_field_name_p) |
3410 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3411 | switch (field->type->type) { |
12bb2edb | 3412 | case lttng_kernel_type_integer: |
ceabb767 MD |
3413 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3414 | break; | |
437d5aa5 | 3415 | case lttng_kernel_type_enum: |
ceabb767 | 3416 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3417 | break; |
12bb2edb | 3418 | case lttng_kernel_type_string: |
ceabb767 | 3419 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3420 | break; |
437d5aa5 | 3421 | case lttng_kernel_type_struct: |
ceabb767 | 3422 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3423 | break; |
437d5aa5 | 3424 | case lttng_kernel_type_array: |
ceabb767 | 3425 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3426 | break; |
437d5aa5 | 3427 | case lttng_kernel_type_sequence: |
51ef4536 | 3428 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3429 | break; |
437d5aa5 | 3430 | case lttng_kernel_type_variant: |
51ef4536 | 3431 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3432 | break; |
f513b2bf | 3433 | |
8070f5c0 MD |
3434 | default: |
3435 | WARN_ON_ONCE(1); | |
3436 | return -EINVAL; | |
3437 | } | |
51ef4536 MD |
3438 | if (prev_field_name_p) |
3439 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3440 | return ret; |
3441 | } | |
3442 | ||
3443 | static | |
8cdc1a81 | 3444 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3445 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3446 | { |
51ef4536 | 3447 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3448 | int ret = 0; |
3449 | int i; | |
3450 | ||
3451 | if (!ctx) | |
3452 | return 0; | |
3453 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3454 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3455 | |
51ef4536 | 3456 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3457 | if (ret) |
3458 | return ret; | |
3459 | } | |
3460 | return ret; | |
3461 | } | |
3462 | ||
3463 | static | |
8cdc1a81 | 3464 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3465 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3466 | { |
51ef4536 | 3467 | const char *prev_field_name = NULL; |
a67ba386 | 3468 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3469 | int ret = 0; |
3470 | int i; | |
3471 | ||
6c8c025b MD |
3472 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3473 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3474 | |
51ef4536 | 3475 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3476 | if (ret) |
3477 | return ret; | |
c099397a MD |
3478 | } |
3479 | return ret; | |
3480 | } | |
3481 | ||
d83004aa JD |
3482 | /* |
3483 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3484 | * The entire event metadata is printed as a single atomic metadata |
3485 | * transaction. | |
d83004aa | 3486 | */ |
c099397a | 3487 | static |
ee7e9a18 | 3488 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3489 | { |
ee7e9a18 MD |
3490 | struct lttng_kernel_event_recorder *event_recorder; |
3491 | struct lttng_kernel_channel_buffer *chan; | |
3492 | struct lttng_kernel_session *session; | |
c099397a MD |
3493 | int ret = 0; |
3494 | ||
ee7e9a18 MD |
3495 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3496 | return 0; | |
3497 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3498 | chan = event_recorder->chan; | |
3499 | session = chan->parent.session; | |
3500 | ||
a67ba386 | 3501 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3502 | return 0; |
f7d06400 | 3503 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3504 | return 0; |
3505 | ||
8b97fd42 MD |
3506 | lttng_metadata_begin(session); |
3507 | ||
c099397a MD |
3508 | ret = lttng_metadata_printf(session, |
3509 | "event {\n" | |
ae734547 | 3510 | " name = \"%s\";\n" |
c099397a | 3511 | " id = %u;\n" |
b9074a1b | 3512 | " stream_id = %u;\n", |
a67ba386 MD |
3513 | event_recorder->priv->parent.desc->event_name, |
3514 | event_recorder->priv->id, | |
f7d06400 | 3515 | event_recorder->chan->priv->id); |
c099397a MD |
3516 | if (ret) |
3517 | goto end; | |
3518 | ||
8070f5c0 | 3519 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3520 | " fields := struct {\n" |
3521 | ); | |
3522 | if (ret) | |
3523 | goto end; | |
3524 | ||
a67ba386 | 3525 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3526 | if (ret) |
3527 | goto end; | |
3528 | ||
3529 | /* | |
3530 | * LTTng space reservation can only reserve multiples of the | |
3531 | * byte size. | |
3532 | */ | |
3533 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3534 | " };\n" |
3535 | "};\n\n"); | |
c099397a MD |
3536 | if (ret) |
3537 | goto end; | |
3538 | ||
a67ba386 | 3539 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3540 | end: |
8b97fd42 | 3541 | lttng_metadata_end(session); |
c099397a MD |
3542 | return ret; |
3543 | ||
3544 | } | |
3545 | ||
d83004aa JD |
3546 | /* |
3547 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3548 | * The entire channel metadata is printed as a single atomic metadata |
3549 | * transaction. | |
d83004aa | 3550 | */ |
c099397a | 3551 | static |
8cdc1a81 | 3552 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3553 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3554 | { |
3555 | int ret = 0; | |
3556 | ||
f7d06400 | 3557 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3558 | return 0; |
d83004aa | 3559 | |
f7d06400 | 3560 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3561 | return 0; |
3562 | ||
8b97fd42 MD |
3563 | lttng_metadata_begin(session); |
3564 | ||
f7d06400 | 3565 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3566 | ret = lttng_metadata_printf(session, |
3567 | "stream {\n" | |
3568 | " id = %u;\n" | |
9115fbdc | 3569 | " event.header := %s;\n" |
b9074a1b | 3570 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3571 | chan->priv->id, |
3572 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3573 | "struct event_header_large"); |
3574 | if (ret) | |
3575 | goto end; | |
3576 | ||
f7d06400 | 3577 | if (chan->priv->ctx) { |
b9074a1b MD |
3578 | ret = lttng_metadata_printf(session, |
3579 | " event.context := struct {\n"); | |
3580 | if (ret) | |
3581 | goto end; | |
3582 | } | |
f7d06400 | 3583 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3584 | if (ret) |
3585 | goto end; | |
f7d06400 | 3586 | if (chan->priv->ctx) { |
b9074a1b MD |
3587 | ret = lttng_metadata_printf(session, |
3588 | " };\n"); | |
3589 | if (ret) | |
3590 | goto end; | |
3591 | } | |
8070f5c0 MD |
3592 | |
3593 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3594 | "};\n\n"); |
8070f5c0 | 3595 | |
f7d06400 | 3596 | chan->priv->metadata_dumped = 1; |
c099397a | 3597 | end: |
8b97fd42 | 3598 | lttng_metadata_end(session); |
c099397a MD |
3599 | return ret; |
3600 | } | |
3601 | ||
d83004aa JD |
3602 | /* |
3603 | * Must be called with sessions_mutex held. | |
3604 | */ | |
9115fbdc | 3605 | static |
8cdc1a81 | 3606 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3607 | { |
3608 | return lttng_metadata_printf(session, | |
3609 | "struct packet_context {\n" | |
a3ccff4f MD |
3610 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3611 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3612 | " uint64_t content_size;\n" |
3613 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3614 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3615 | " unsigned long events_discarded;\n" |
9115fbdc | 3616 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3617 | "};\n\n" |
9115fbdc MD |
3618 | ); |
3619 | } | |
3620 | ||
3621 | /* | |
3622 | * Compact header: | |
3623 | * id: range: 0 - 30. | |
3624 | * id 31 is reserved to indicate an extended header. | |
3625 | * | |
3626 | * Large header: | |
3627 | * id: range: 0 - 65534. | |
3628 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3629 | * |
3630 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3631 | */ |
3632 | static | |
8cdc1a81 | 3633 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3634 | { |
3635 | return lttng_metadata_printf(session, | |
3636 | "struct event_header_compact {\n" | |
3637 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3638 | " variant <id> {\n" | |
3639 | " struct {\n" | |
a3ccff4f | 3640 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3641 | " } compact;\n" |
3642 | " struct {\n" | |
3643 | " uint32_t id;\n" | |
a3ccff4f | 3644 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3645 | " } extended;\n" |
3646 | " } v;\n" | |
3647 | "} align(%u);\n" | |
3648 | "\n" | |
3649 | "struct event_header_large {\n" | |
3650 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3651 | " variant <id> {\n" | |
3652 | " struct {\n" | |
a3ccff4f | 3653 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3654 | " } compact;\n" |
3655 | " struct {\n" | |
3656 | " uint32_t id;\n" | |
a3ccff4f | 3657 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3658 | " } extended;\n" |
3659 | " } v;\n" | |
3660 | "} align(%u);\n\n", | |
a90917c3 MD |
3661 | lttng_alignof(uint32_t) * CHAR_BIT, |
3662 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3663 | ); |
3664 | } | |
3665 | ||
a3ccff4f MD |
3666 | /* |
3667 | * Approximation of NTP time of day to clock monotonic correlation, | |
3668 | * taken at start of trace. | |
3669 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3670 | * in future versions. | |
5283350b MD |
3671 | * This function may return a negative offset. It may happen if the |
3672 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3673 | * |
3674 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3675 | * y2038 compliant. | |
a3ccff4f MD |
3676 | */ |
3677 | static | |
8967b2a3 | 3678 | int64_t measure_clock_offset(void) |
a3ccff4f | 3679 | { |
dcb93448 | 3680 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3681 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3682 | int64_t offset; |
a3ccff4f | 3683 | unsigned long flags; |
3636085f | 3684 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
3685 | |
3686 | /* Disable interrupts to increase correlation precision. */ | |
3687 | local_irq_save(flags); | |
3688 | monotonic[0] = trace_clock_read64(); | |
3636085f | 3689 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
3690 | monotonic[1] = trace_clock_read64(); |
3691 | local_irq_restore(flags); | |
3692 | ||
dcb93448 | 3693 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3694 | realtime = (uint64_t) rts.tv_sec * tcf; |
3695 | if (tcf == NSEC_PER_SEC) { | |
3696 | realtime += rts.tv_nsec; | |
3697 | } else { | |
3698 | uint64_t n = rts.tv_nsec * tcf; | |
3699 | ||
3700 | do_div(n, NSEC_PER_SEC); | |
3701 | realtime += n; | |
3702 | } | |
dcb93448 | 3703 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3704 | return offset; |
3705 | } | |
3706 | ||
3eb95be4 | 3707 | static |
8cdc1a81 | 3708 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3709 | { |
0f3eaad4 | 3710 | int ret = 0; |
3eb95be4 JR |
3711 | size_t i; |
3712 | char cur; | |
3713 | ||
3714 | i = 0; | |
3715 | cur = string[i]; | |
3716 | while (cur != '\0') { | |
3717 | switch (cur) { | |
3718 | case '\n': | |
3719 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3720 | break; | |
3721 | case '\\': | |
3722 | case '"': | |
3723 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3724 | if (ret) | |
3725 | goto error; | |
3726 | /* We still print the current char */ | |
c190d76e | 3727 | lttng_fallthrough; |
3eb95be4 JR |
3728 | default: |
3729 | ret = lttng_metadata_printf(session, "%c", cur); | |
3730 | break; | |
3731 | } | |
3732 | ||
3733 | if (ret) | |
3734 | goto error; | |
3735 | ||
3736 | cur = string[++i]; | |
3737 | } | |
3738 | error: | |
3739 | return ret; | |
3740 | } | |
3741 | ||
3742 | static | |
8cdc1a81 | 3743 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3744 | const char *field_value) |
3eb95be4 JR |
3745 | { |
3746 | int ret; | |
3747 | ||
1c88f269 | 3748 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3749 | if (ret) |
3750 | goto error; | |
3751 | ||
1c88f269 | 3752 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3753 | if (ret) |
3754 | goto error; | |
3755 | ||
3756 | ret = lttng_metadata_printf(session, "\";\n"); | |
3757 | ||
3758 | error: | |
3759 | return ret; | |
3760 | } | |
3761 | ||
c099397a MD |
3762 | /* |
3763 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3764 | * Must be called with sessions_mutex held. |
c099397a MD |
3765 | */ |
3766 | static | |
8cdc1a81 | 3767 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3768 | { |
8cdc1a81 | 3769 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3770 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3771 | const char *product_uuid; |
f7d06400 | 3772 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3773 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3774 | int ret = 0; |
3775 | ||
585e5dcc | 3776 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3777 | return 0; |
8b97fd42 MD |
3778 | |
3779 | lttng_metadata_begin(session); | |
3780 | ||
8cdc1a81 | 3781 | if (session->priv->metadata_dumped) |
c099397a | 3782 | goto skip_session; |
c099397a | 3783 | |
d793d5e1 | 3784 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3785 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3786 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3787 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3788 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3789 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3790 | |
3791 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3792 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3793 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3794 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3795 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3796 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3797 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3798 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3799 | "\n" |
3800 | "trace {\n" | |
3801 | " major = %u;\n" | |
3802 | " minor = %u;\n" | |
30bdb6e4 | 3803 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3804 | " byte_order = %s;\n" |
3805 | " packet.header := struct {\n" | |
3806 | " uint32_t magic;\n" | |
1ec3f75a | 3807 | " uint8_t uuid[16];\n" |
d793d5e1 | 3808 | " uint32_t stream_id;\n" |
5594698f | 3809 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3810 | " };\n" |
d793d5e1 | 3811 | "};\n\n", |
a90917c3 MD |
3812 | lttng_alignof(uint8_t) * CHAR_BIT, |
3813 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3814 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3815 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3816 | sizeof(unsigned long) * CHAR_BIT, |
3817 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3818 | CTF_SPEC_MAJOR, |
3819 | CTF_SPEC_MINOR, | |
d793d5e1 | 3820 | uuid_s, |
5214fa50 | 3821 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3822 | "be" |
3823 | #else | |
3824 | "le" | |
3825 | #endif | |
3826 | ); | |
3827 | if (ret) | |
3828 | goto end; | |
3829 | ||
99dc9597 MD |
3830 | ret = lttng_metadata_printf(session, |
3831 | "env {\n" | |
a6058143 | 3832 | " hostname = \"%s\";\n" |
c6c9e10f | 3833 | " domain = \"kernel\";\n" |
99dc9597 | 3834 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3835 | " kernel_release = \"%s\";\n" |
3836 | " kernel_version = \"%s\";\n" | |
3837 | " tracer_name = \"lttng-modules\";\n" | |
3838 | " tracer_major = %d;\n" | |
3839 | " tracer_minor = %d;\n" | |
3840 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3841 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3842 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3843 | utsname()->sysname, |
3844 | utsname()->release, | |
c6c9e10f MD |
3845 | utsname()->version, |
3846 | LTTNG_MODULES_MAJOR_VERSION, | |
3847 | LTTNG_MODULES_MINOR_VERSION, | |
3848 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3849 | ); |
3850 | if (ret) | |
3851 | goto end; | |
3852 | ||
8cdc1a81 | 3853 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3854 | if (ret) |
3855 | goto end; | |
3856 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3857 | session->priv->creation_time); |
3eb95be4 JR |
3858 | if (ret) |
3859 | goto end; | |
3860 | ||
c88f762e GB |
3861 | /* Add the product UUID to the 'env' section */ |
3862 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3863 | if (product_uuid) { | |
3864 | ret = lttng_metadata_printf(session, | |
3865 | " product_uuid = \"%s\";\n", | |
3866 | product_uuid | |
3867 | ); | |
3868 | if (ret) | |
3869 | goto end; | |
3870 | } | |
3871 | ||
3872 | /* Close the 'env' section */ | |
3eb95be4 JR |
3873 | ret = lttng_metadata_printf(session, "};\n\n"); |
3874 | if (ret) | |
3875 | goto end; | |
3876 | ||
a3ccff4f MD |
3877 | ret = lttng_metadata_printf(session, |
3878 | "clock {\n" | |
2754583e MD |
3879 | " name = \"%s\";\n", |
3880 | trace_clock_name() | |
a82c63f1 MD |
3881 | ); |
3882 | if (ret) | |
3883 | goto end; | |
3884 | ||
3885 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3886 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3887 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3888 | clock_uuid_s |
3889 | ); | |
3890 | if (ret) | |
3891 | goto end; | |
3892 | } | |
3893 | ||
3894 | ret = lttng_metadata_printf(session, | |
2754583e | 3895 | " description = \"%s\";\n" |
a3ccff4f MD |
3896 | " freq = %llu; /* Frequency, in Hz */\n" |
3897 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3898 | " offset = %lld;\n" |
a3ccff4f | 3899 | "};\n\n", |
2754583e | 3900 | trace_clock_description(), |
a3ccff4f | 3901 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3902 | (long long) measure_clock_offset() |
a3ccff4f MD |
3903 | ); |
3904 | if (ret) | |
3905 | goto end; | |
3906 | ||
3907 | ret = lttng_metadata_printf(session, | |
3908 | "typealias integer {\n" | |
3909 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3910 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3911 | "} := uint27_clock_monotonic_t;\n" |
3912 | "\n" | |
3913 | "typealias integer {\n" | |
3914 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3915 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3916 | "} := uint32_clock_monotonic_t;\n" |
3917 | "\n" | |
3918 | "typealias integer {\n" | |
3919 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3920 | " map = clock.%s.value;\n" |
a3ccff4f | 3921 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3922 | trace_clock_name(), |
a3ccff4f | 3923 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3924 | trace_clock_name(), |
3925 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3926 | trace_clock_name() | |
a3ccff4f MD |
3927 | ); |
3928 | if (ret) | |
3929 | goto end; | |
3930 | ||
a90917c3 | 3931 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3932 | if (ret) |
3933 | goto end; | |
3934 | ||
a90917c3 | 3935 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3936 | if (ret) |
3937 | goto end; | |
3938 | ||
c099397a | 3939 | skip_session: |
f7d06400 MD |
3940 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3941 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3942 | if (ret) |
3943 | goto end; | |
3944 | } | |
3945 | ||
f237aef8 | 3946 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3947 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3948 | if (ret) |
3949 | goto end; | |
3950 | } | |
8cdc1a81 | 3951 | session->priv->metadata_dumped = 1; |
c099397a | 3952 | end: |
8b97fd42 | 3953 | lttng_metadata_end(session); |
c099397a MD |
3954 | return ret; |
3955 | } | |
3956 | ||
c0e31d2e | 3957 | /** |
a90917c3 | 3958 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3959 | * @transport: transport structure |
3960 | * | |
3961 | * Registers a transport which can be used as output to extract the data out of | |
3962 | * LTTng. The module calling this registration function must ensure that no | |
3963 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3964 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3965 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3966 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3967 | * after its registration must it synchronize the TLBs. |
3968 | */ | |
a90917c3 | 3969 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3970 | { |
3971 | /* | |
3972 | * Make sure no page fault can be triggered by the module about to be | |
3973 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3974 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3975 | */ |
263b6c88 | 3976 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3977 | |
3978 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3979 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3980 | mutex_unlock(&sessions_mutex); |
3981 | } | |
a90917c3 | 3982 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3983 | |
3984 | /** | |
a90917c3 | 3985 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3986 | * @transport: transport structure |
3987 | */ | |
a90917c3 | 3988 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3989 | { |
3990 | mutex_lock(&sessions_mutex); | |
3991 | list_del(&transport->node); | |
3992 | mutex_unlock(&sessions_mutex); | |
3993 | } | |
a90917c3 | 3994 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3995 | |
a101fa10 MD |
3996 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
3997 | { | |
3998 | /* | |
3999 | * Make sure no page fault can be triggered by the module about to be | |
4000 | * registered. We deal with this here so we don't have to call | |
4001 | * vmalloc_sync_mappings() in each module's init. | |
4002 | */ | |
4003 | wrapper_vmalloc_sync_mappings(); | |
4004 | ||
4005 | mutex_lock(&sessions_mutex); | |
4006 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4007 | mutex_unlock(&sessions_mutex); | |
4008 | } | |
4009 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4010 | ||
4011 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4012 | { | |
4013 | mutex_lock(&sessions_mutex); | |
4014 | list_del(&transport->node); | |
4015 | mutex_unlock(&sessions_mutex); | |
4016 | } | |
4017 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4018 | ||
5f4c791e | 4019 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4020 | |
4021 | enum cpuhp_state lttng_hp_prepare; | |
4022 | enum cpuhp_state lttng_hp_online; | |
4023 | ||
4024 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4025 | { | |
4026 | struct lttng_cpuhp_node *lttng_node; | |
4027 | ||
4028 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4029 | switch (lttng_node->component) { | |
4030 | case LTTNG_RING_BUFFER_FRONTEND: | |
4031 | return 0; | |
4032 | case LTTNG_RING_BUFFER_BACKEND: | |
4033 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4034 | case LTTNG_RING_BUFFER_ITER: | |
4035 | return 0; | |
4036 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4037 | return 0; | |
4038 | default: | |
4039 | return -EINVAL; | |
4040 | } | |
4041 | } | |
4042 | ||
4043 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4044 | { | |
4045 | struct lttng_cpuhp_node *lttng_node; | |
4046 | ||
4047 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4048 | switch (lttng_node->component) { | |
4049 | case LTTNG_RING_BUFFER_FRONTEND: | |
4050 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4051 | case LTTNG_RING_BUFFER_BACKEND: | |
4052 | return 0; | |
4053 | case LTTNG_RING_BUFFER_ITER: | |
4054 | return 0; | |
4055 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4056 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4057 | default: | |
4058 | return -EINVAL; | |
4059 | } | |
4060 | } | |
4061 | ||
4062 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4063 | { | |
4064 | struct lttng_cpuhp_node *lttng_node; | |
4065 | ||
4066 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4067 | switch (lttng_node->component) { | |
4068 | case LTTNG_RING_BUFFER_FRONTEND: | |
4069 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4070 | case LTTNG_RING_BUFFER_BACKEND: | |
4071 | return 0; | |
4072 | case LTTNG_RING_BUFFER_ITER: | |
4073 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4074 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4075 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4076 | default: | |
4077 | return -EINVAL; | |
4078 | } | |
4079 | } | |
4080 | ||
4081 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4082 | { | |
4083 | struct lttng_cpuhp_node *lttng_node; | |
4084 | ||
4085 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4086 | switch (lttng_node->component) { | |
4087 | case LTTNG_RING_BUFFER_FRONTEND: | |
4088 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4089 | case LTTNG_RING_BUFFER_BACKEND: | |
4090 | return 0; | |
4091 | case LTTNG_RING_BUFFER_ITER: | |
4092 | return 0; | |
4093 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4094 | return 0; | |
4095 | default: | |
4096 | return -EINVAL; | |
4097 | } | |
4098 | } | |
4099 | ||
4100 | static int __init lttng_init_cpu_hotplug(void) | |
4101 | { | |
4102 | int ret; | |
4103 | ||
4104 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4105 | lttng_hotplug_prepare, | |
4106 | lttng_hotplug_dead); | |
4107 | if (ret < 0) { | |
4108 | return ret; | |
4109 | } | |
4110 | lttng_hp_prepare = ret; | |
4111 | lttng_rb_set_hp_prepare(ret); | |
4112 | ||
4113 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4114 | lttng_hotplug_online, | |
4115 | lttng_hotplug_offline); | |
4116 | if (ret < 0) { | |
4117 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4118 | lttng_hp_prepare = 0; | |
4119 | return ret; | |
4120 | } | |
4121 | lttng_hp_online = ret; | |
4122 | lttng_rb_set_hp_online(ret); | |
4123 | ||
4124 | return 0; | |
4125 | } | |
4126 | ||
4127 | static void __exit lttng_exit_cpu_hotplug(void) | |
4128 | { | |
4129 | lttng_rb_set_hp_online(0); | |
4130 | cpuhp_remove_multi_state(lttng_hp_online); | |
4131 | lttng_rb_set_hp_prepare(0); | |
4132 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4133 | } | |
4134 | ||
5f4c791e | 4135 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4136 | static int lttng_init_cpu_hotplug(void) |
4137 | { | |
4138 | return 0; | |
4139 | } | |
4140 | static void lttng_exit_cpu_hotplug(void) | |
4141 | { | |
4142 | } | |
5f4c791e | 4143 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4144 | |
a90917c3 | 4145 | static int __init lttng_events_init(void) |
4e3c1b9b | 4146 | { |
1c25284c MD |
4147 | int ret; |
4148 | ||
389d7070 | 4149 | ret = wrapper_get_pfnblock_flags_mask_init(); |
114667d5 MD |
4150 | if (ret) |
4151 | return ret; | |
4152 | ret = lttng_probes_init(); | |
389d7070 MD |
4153 | if (ret) |
4154 | return ret; | |
07dfc1d0 | 4155 | ret = lttng_context_init(); |
20591cf7 MD |
4156 | if (ret) |
4157 | return ret; | |
07dfc1d0 MD |
4158 | ret = lttng_tracepoint_init(); |
4159 | if (ret) | |
4160 | goto error_tp; | |
a67ba386 MD |
4161 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4162 | if (!event_recorder_cache) { | |
20591cf7 | 4163 | ret = -ENOMEM; |
a67ba386 | 4164 | goto error_kmem_event_recorder; |
dffef45d | 4165 | } |
a67ba386 MD |
4166 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4167 | if (!event_recorder_private_cache) { | |
4168 | ret = -ENOMEM; | |
4169 | goto error_kmem_event_recorder_private; | |
4170 | } | |
4171 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4172 | if (!event_notifier_cache) { |
4173 | ret = -ENOMEM; | |
4174 | goto error_kmem_event_notifier; | |
20591cf7 | 4175 | } |
a67ba386 MD |
4176 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4177 | if (!event_notifier_private_cache) { | |
4178 | ret = -ENOMEM; | |
4179 | goto error_kmem_event_notifier_private; | |
4180 | } | |
80996790 | 4181 | ret = lttng_abi_init(); |
02119ee5 MD |
4182 | if (ret) |
4183 | goto error_abi; | |
0c956676 MD |
4184 | ret = lttng_logger_init(); |
4185 | if (ret) | |
4186 | goto error_logger; | |
1e367326 MD |
4187 | ret = lttng_init_cpu_hotplug(); |
4188 | if (ret) | |
4189 | goto error_hotplug; | |
101215b7 | 4190 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4191 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4192 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4193 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4194 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4195 | LTTNG_VERSION_NAME, |
4196 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4197 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4198 | #else | |
4199 | "", | |
4200 | #endif | |
4201 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4202 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4203 | #else | |
4204 | ""); | |
4205 | #endif | |
c1551e57 MJ |
4206 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4207 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4208 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4209 | return 0; |
0c956676 | 4210 | |
1e367326 MD |
4211 | error_hotplug: |
4212 | lttng_logger_exit(); | |
0c956676 MD |
4213 | error_logger: |
4214 | lttng_abi_exit(); | |
02119ee5 | 4215 | error_abi: |
a67ba386 MD |
4216 | kmem_cache_destroy(event_notifier_private_cache); |
4217 | error_kmem_event_notifier_private: | |
dffef45d FD |
4218 | kmem_cache_destroy(event_notifier_cache); |
4219 | error_kmem_event_notifier: | |
a67ba386 MD |
4220 | kmem_cache_destroy(event_recorder_private_cache); |
4221 | error_kmem_event_recorder_private: | |
4222 | kmem_cache_destroy(event_recorder_cache); | |
4223 | error_kmem_event_recorder: | |
20591cf7 | 4224 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4225 | error_tp: |
4226 | lttng_context_exit(); | |
101215b7 | 4227 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4228 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4229 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4230 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4231 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4232 | LTTNG_VERSION_NAME, |
4233 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4234 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4235 | #else | |
4236 | "", | |
4237 | #endif | |
4238 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4239 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4240 | #else | |
4241 | ""); | |
4242 | #endif | |
1c25284c | 4243 | return ret; |
4e3c1b9b MD |
4244 | } |
4245 | ||
a90917c3 | 4246 | module_init(lttng_events_init); |
11b5a3c2 | 4247 | |
a90917c3 | 4248 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4249 | { |
8cdc1a81 | 4250 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4251 | |
1e367326 | 4252 | lttng_exit_cpu_hotplug(); |
0c956676 | 4253 | lttng_logger_exit(); |
80996790 | 4254 | lttng_abi_exit(); |
8cdc1a81 MD |
4255 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4256 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4257 | kmem_cache_destroy(event_recorder_cache); |
4258 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4259 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4260 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4261 | lttng_tracepoint_exit(); |
07dfc1d0 | 4262 | lttng_context_exit(); |
101215b7 | 4263 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4264 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4265 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4266 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4267 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4268 | LTTNG_VERSION_NAME, |
4269 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4270 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4271 | #else | |
4272 | "", | |
4273 | #endif | |
4274 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4275 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4276 | #else | |
4277 | ""); | |
4278 | #endif | |
4e3c1b9b | 4279 | } |
92e94819 | 4280 | |
a90917c3 | 4281 | module_exit(lttng_events_exit); |
11b5a3c2 | 4282 | |
7ca11e77 | 4283 | #include <generated/patches.h> |
101215b7 MJ |
4284 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4285 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4286 | #endif | |
4287 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4288 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4289 | #endif | |
92e94819 MD |
4290 | MODULE_LICENSE("GPL and additional rights"); |
4291 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4292 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4293 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4294 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4295 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4296 | LTTNG_MODULES_EXTRAVERSION); |