Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
c190d76e | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b | 61 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
62 | static struct kmem_cache *event_recorder_cache; |
63 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 64 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 65 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 66 | |
8cdc1a81 MD |
67 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
68 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 69 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 70 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 73 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
6a338ba4 | 74 | static void _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 75 | static |
ee7e9a18 | 76 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 77 | static |
8cdc1a81 | 78 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
79 | static |
80 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 81 | static |
8cdc1a81 | 82 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
83 | const struct lttng_kernel_type_common *type, |
84 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
85 | size_t nesting); |
86 | static | |
8cdc1a81 | 87 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 88 | const struct lttng_kernel_event_field *field, |
51ef4536 | 89 | size_t nesting, const char **prev_field_name_p); |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
05355f0b MJ |
93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
94 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
95 | synchronize_rcu(); |
96 | #else | |
abcca994 | 97 | synchronize_sched(); |
92da05ce MJ |
98 | #endif |
99 | ||
5f4c791e | 100 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
101 | #ifdef CONFIG_PREEMPT_RT_FULL |
102 | synchronize_rcu(); | |
103 | #endif | |
5f4c791e | 104 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
105 | #ifdef CONFIG_PREEMPT_RT |
106 | synchronize_rcu(); | |
107 | #endif | |
5f4c791e | 108 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
109 | } |
110 | ||
3c997079 MD |
111 | void lttng_lock_sessions(void) |
112 | { | |
113 | mutex_lock(&sessions_mutex); | |
114 | } | |
115 | ||
116 | void lttng_unlock_sessions(void) | |
117 | { | |
118 | mutex_unlock(&sessions_mutex); | |
119 | } | |
120 | ||
9fe593d2 FD |
121 | static struct lttng_transport *lttng_transport_find(const char *name) |
122 | { | |
123 | struct lttng_transport *transport; | |
124 | ||
125 | list_for_each_entry(transport, <tng_transport_list, node) { | |
126 | if (!strcmp(transport->name, name)) | |
127 | return transport; | |
128 | } | |
129 | return NULL; | |
130 | } | |
131 | ||
3c997079 MD |
132 | /* |
133 | * Called with sessions lock held. | |
134 | */ | |
135 | int lttng_session_active(void) | |
136 | { | |
8cdc1a81 | 137 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
138 | |
139 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 140 | if (iter->pub->active) |
3c997079 MD |
141 | return 1; |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
8cdc1a81 | 146 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 147 | { |
8cdc1a81 MD |
148 | struct lttng_kernel_session *session; |
149 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 150 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 151 | int i; |
4e3c1b9b MD |
152 | |
153 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 154 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 155 | if (!session) |
d83004aa | 156 | goto err; |
8cdc1a81 MD |
157 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
158 | if (!session_priv) | |
159 | goto err_free_session; | |
160 | session->priv = session_priv; | |
161 | session_priv->pub = session; | |
162 | ||
163 | INIT_LIST_HEAD(&session_priv->chan); | |
164 | INIT_LIST_HEAD(&session_priv->events); | |
165 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
166 | |
167 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
168 | GFP_KERNEL); | |
169 | if (!metadata_cache) | |
8cdc1a81 | 170 | goto err_free_session_private; |
0ca42eb7 | 171 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
172 | if (!metadata_cache->data) |
173 | goto err_free_cache; | |
174 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
175 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 176 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 177 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 178 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 179 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 180 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 181 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 182 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
183 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
184 | list_add(&session_priv->list, &sessions); | |
185 | ||
8c0393c3 MD |
186 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
187 | goto tracker_alloc_error; | |
188 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
189 | goto tracker_alloc_error; | |
190 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
197 | goto tracker_alloc_error; | |
198 | ||
4e3c1b9b | 199 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 200 | |
4e3c1b9b | 201 | return session; |
d83004aa | 202 | |
8c0393c3 MD |
203 | tracker_alloc_error: |
204 | lttng_id_tracker_fini(&session->pid_tracker); | |
205 | lttng_id_tracker_fini(&session->vpid_tracker); | |
206 | lttng_id_tracker_fini(&session->uid_tracker); | |
207 | lttng_id_tracker_fini(&session->vuid_tracker); | |
208 | lttng_id_tracker_fini(&session->gid_tracker); | |
209 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
210 | err_free_cache: |
211 | kfree(metadata_cache); | |
8cdc1a81 MD |
212 | err_free_session_private: |
213 | lttng_kvfree(session_priv); | |
d83004aa | 214 | err_free_session: |
48f5e0b5 | 215 | lttng_kvfree(session); |
d83004aa JD |
216 | err: |
217 | mutex_unlock(&sessions_mutex); | |
218 | return NULL; | |
219 | } | |
220 | ||
99f52fcc FD |
221 | static |
222 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
223 | { | |
224 | struct lttng_counter_transport *transport; | |
225 | ||
226 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
227 | if (!strcmp(transport->name, name)) | |
228 | return transport; | |
229 | } | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | struct lttng_counter *lttng_kernel_counter_create( | |
234 | const char *counter_transport_name, | |
235 | size_t number_dimensions, const size_t *dimensions_sizes) | |
236 | { | |
237 | struct lttng_counter *counter = NULL; | |
238 | struct lttng_counter_transport *counter_transport = NULL; | |
239 | ||
240 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
241 | if (!counter_transport) { | |
242 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
243 | counter_transport_name); | |
244 | goto notransport; | |
245 | } | |
246 | if (!try_module_get(counter_transport->owner)) { | |
247 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
248 | goto notransport; | |
249 | } | |
250 | ||
251 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
252 | if (!counter) | |
253 | goto nomem; | |
254 | ||
255 | /* Create event notifier error counter. */ | |
256 | counter->ops = &counter_transport->ops; | |
257 | counter->transport = counter_transport; | |
258 | ||
259 | counter->counter = counter->ops->counter_create( | |
260 | number_dimensions, dimensions_sizes, 0); | |
261 | if (!counter->counter) { | |
262 | goto create_error; | |
263 | } | |
264 | ||
265 | return counter; | |
266 | ||
267 | create_error: | |
268 | lttng_kvfree(counter); | |
269 | nomem: | |
270 | if (counter_transport) | |
271 | module_put(counter_transport->owner); | |
272 | notransport: | |
273 | return NULL; | |
274 | } | |
275 | ||
750b05f2 FD |
276 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
277 | { | |
278 | struct lttng_transport *transport = NULL; | |
279 | struct lttng_event_notifier_group *event_notifier_group; | |
280 | const char *transport_name = "relay-event-notifier"; | |
281 | size_t subbuf_size = 4096; //TODO | |
282 | size_t num_subbuf = 16; //TODO | |
283 | unsigned int switch_timer_interval = 0; | |
284 | unsigned int read_timer_interval = 0; | |
dffef45d | 285 | int i; |
750b05f2 FD |
286 | |
287 | mutex_lock(&sessions_mutex); | |
288 | ||
289 | transport = lttng_transport_find(transport_name); | |
290 | if (!transport) { | |
291 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
292 | transport_name); | |
293 | goto notransport; | |
294 | } | |
295 | if (!try_module_get(transport->owner)) { | |
296 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
297 | transport_name); | |
298 | goto notransport; | |
299 | } | |
300 | ||
301 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
302 | GFP_KERNEL); | |
303 | if (!event_notifier_group) | |
304 | goto nomem; | |
305 | ||
306 | /* | |
307 | * Initialize the ring buffer used to store event notifier | |
308 | * notifications. | |
309 | */ | |
310 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 311 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
312 | transport_name, event_notifier_group, NULL, |
313 | subbuf_size, num_subbuf, switch_timer_interval, | |
314 | read_timer_interval); | |
315 | if (!event_notifier_group->chan) | |
316 | goto create_error; | |
317 | ||
318 | event_notifier_group->transport = transport; | |
dffef45d FD |
319 | |
320 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
321 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
322 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
323 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 324 | |
750b05f2 FD |
325 | list_add(&event_notifier_group->node, &event_notifier_groups); |
326 | ||
327 | mutex_unlock(&sessions_mutex); | |
328 | ||
329 | return event_notifier_group; | |
330 | ||
331 | create_error: | |
332 | lttng_kvfree(event_notifier_group); | |
333 | nomem: | |
334 | if (transport) | |
335 | module_put(transport->owner); | |
336 | notransport: | |
337 | mutex_unlock(&sessions_mutex); | |
338 | return NULL; | |
339 | } | |
340 | ||
d83004aa JD |
341 | void metadata_cache_destroy(struct kref *kref) |
342 | { | |
343 | struct lttng_metadata_cache *cache = | |
344 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 345 | vfree(cache->data); |
d83004aa | 346 | kfree(cache); |
4e3c1b9b MD |
347 | } |
348 | ||
8cdc1a81 | 349 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 350 | { |
f7d06400 | 351 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 352 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 353 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 354 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 355 | int ret; |
4e3c1b9b MD |
356 | |
357 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 358 | WRITE_ONCE(session->active, 0); |
f7d06400 | 359 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 360 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
361 | WARN_ON(ret); |
362 | } | |
6a338ba4 MD |
363 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) |
364 | _lttng_event_unregister(&event_recorder_priv->pub->parent); | |
abcca994 | 365 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 366 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 367 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
368 | WARN_ON(ret); |
369 | } | |
09710b83 MD |
370 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
371 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 372 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 373 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
374 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
375 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
376 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 377 | } |
8cdc1a81 MD |
378 | mutex_lock(&session->priv->metadata_cache->lock); |
379 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 380 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 381 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
382 | lttng_id_tracker_fini(&session->pid_tracker); |
383 | lttng_id_tracker_fini(&session->vpid_tracker); | |
384 | lttng_id_tracker_fini(&session->uid_tracker); | |
385 | lttng_id_tracker_fini(&session->vuid_tracker); | |
386 | lttng_id_tracker_fini(&session->gid_tracker); | |
387 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
388 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
389 | list_del(&session->priv->list); | |
4e3c1b9b | 390 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 391 | lttng_kvfree(session->priv); |
48f5e0b5 | 392 | lttng_kvfree(session); |
4e3c1b9b MD |
393 | } |
394 | ||
dffef45d FD |
395 | void lttng_event_notifier_group_destroy( |
396 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 397 | { |
09710b83 | 398 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 399 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
400 | int ret; |
401 | ||
750b05f2 FD |
402 | if (!event_notifier_group) |
403 | return; | |
404 | ||
405 | mutex_lock(&sessions_mutex); | |
dffef45d | 406 | |
6053e75e | 407 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
408 | WARN_ON(ret); |
409 | ||
a67ba386 | 410 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
6a338ba4 MD |
411 | &event_notifier_group->event_notifiers_head, parent.node) |
412 | _lttng_event_unregister(&event_notifier_priv->pub->parent); | |
dffef45d | 413 | |
b01155ba FD |
414 | /* Wait for in-flight event notifier to complete */ |
415 | synchronize_trace(); | |
416 | ||
21f58fb7 FD |
417 | irq_work_sync(&event_notifier_group->wakeup_pending); |
418 | ||
6053e75e MD |
419 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
420 | WARN_ON(ret); | |
8a8ac9a8 | 421 | |
09710b83 | 422 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 423 | &event_notifier_group->enablers_head, node) |
09710b83 | 424 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 425 | |
a67ba386 | 426 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 427 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 428 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 429 | |
99f52fcc FD |
430 | if (event_notifier_group->error_counter) { |
431 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 432 | |
99f52fcc FD |
433 | error_counter->ops->counter_destroy(error_counter->counter); |
434 | module_put(error_counter->transport->owner); | |
435 | lttng_kvfree(error_counter); | |
436 | event_notifier_group->error_counter = NULL; | |
437 | } | |
438 | ||
4a399b76 | 439 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
440 | module_put(event_notifier_group->transport->owner); |
441 | list_del(&event_notifier_group->node); | |
dffef45d | 442 | |
750b05f2 FD |
443 | mutex_unlock(&sessions_mutex); |
444 | lttng_kvfree(event_notifier_group); | |
445 | } | |
446 | ||
8cdc1a81 | 447 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
448 | { |
449 | int ret; | |
450 | ||
451 | mutex_lock(&sessions_mutex); | |
452 | ret = lttng_statedump_start(session); | |
453 | mutex_unlock(&sessions_mutex); | |
454 | return ret; | |
455 | } | |
456 | ||
8cdc1a81 | 457 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
458 | { |
459 | int ret = 0; | |
f7d06400 | 460 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
461 | |
462 | mutex_lock(&sessions_mutex); | |
463 | if (session->active) { | |
464 | ret = -EBUSY; | |
465 | goto end; | |
466 | } | |
c099397a | 467 | |
3c997079 | 468 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 469 | session->priv->tstate = 1; |
3c997079 | 470 | |
4ef81e4a | 471 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 472 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 473 | |
c099397a MD |
474 | /* |
475 | * Snapshot the number of events per channel to know the type of header | |
476 | * we need to use. | |
477 | */ | |
f7d06400 MD |
478 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
479 | if (chan_priv->header_type) | |
480 | continue; /* don't change it if session stop/restart */ | |
481 | if (chan_priv->free_event_id < 31) | |
482 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 483 | else |
f7d06400 | 484 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
485 | } |
486 | ||
64af2437 | 487 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
488 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
489 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
490 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 491 | } |
64af2437 | 492 | |
a8f2d0c7 | 493 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 494 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 495 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 496 | if (ret) { |
a8f2d0c7 | 497 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
498 | goto end; |
499 | } | |
500 | ret = lttng_statedump_start(session); | |
360f38ea | 501 | if (ret) |
a8f2d0c7 | 502 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
503 | end: |
504 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 505 | return ret; |
c0e31d2e MD |
506 | } |
507 | ||
8cdc1a81 | 508 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
509 | { |
510 | int ret = 0; | |
f7d06400 | 511 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
512 | |
513 | mutex_lock(&sessions_mutex); | |
514 | if (!session->active) { | |
515 | ret = -EBUSY; | |
516 | goto end; | |
517 | } | |
a8f2d0c7 | 518 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
519 | |
520 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 521 | session->priv->tstate = 0; |
b2bc0bc8 | 522 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
523 | |
524 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
525 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
526 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
527 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 528 | } |
c0e31d2e MD |
529 | end: |
530 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 531 | return ret; |
c0e31d2e MD |
532 | } |
533 | ||
8cdc1a81 | 534 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
535 | { |
536 | int ret = 0; | |
f7d06400 | 537 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 538 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 539 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
540 | struct lttng_metadata_stream *stream; |
541 | ||
542 | mutex_lock(&sessions_mutex); | |
543 | if (!session->active) { | |
544 | ret = -EBUSY; | |
545 | goto end; | |
546 | } | |
547 | ||
548 | mutex_lock(&cache->lock); | |
549 | memset(cache->data, 0, cache->cache_alloc); | |
550 | cache->metadata_written = 0; | |
551 | cache->version++; | |
8cdc1a81 | 552 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
553 | stream->metadata_out = 0; |
554 | stream->metadata_in = 0; | |
555 | } | |
556 | mutex_unlock(&cache->lock); | |
557 | ||
8cdc1a81 | 558 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
559 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
560 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
561 | } |
562 | ||
f237aef8 | 563 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 564 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
565 | } |
566 | ||
567 | ret = _lttng_session_metadata_statedump(session); | |
568 | ||
569 | end: | |
570 | mutex_unlock(&sessions_mutex); | |
571 | return ret; | |
572 | } | |
573 | ||
6b757027 MD |
574 | static |
575 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
576 | { | |
577 | struct lttng_kernel_channel_buffer *chan_buf; | |
578 | ||
579 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
580 | return false; | |
581 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
582 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
583 | return true; | |
584 | return false; | |
585 | } | |
586 | ||
587 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 588 | { |
3c997079 | 589 | int ret = 0; |
e64957da | 590 | |
3c997079 | 591 | mutex_lock(&sessions_mutex); |
6b757027 | 592 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
593 | ret = -EPERM; |
594 | goto end; | |
595 | } | |
6b757027 | 596 | if (channel->enabled) { |
3c997079 MD |
597 | ret = -EEXIST; |
598 | goto end; | |
599 | } | |
600 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
601 | channel->priv->tstate = 1; |
602 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 603 | /* Set atomically the state to "enabled" */ |
6b757027 | 604 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
605 | end: |
606 | mutex_unlock(&sessions_mutex); | |
607 | return ret; | |
e64957da MD |
608 | } |
609 | ||
6b757027 | 610 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 611 | { |
3c997079 | 612 | int ret = 0; |
e64957da | 613 | |
3c997079 | 614 | mutex_lock(&sessions_mutex); |
6b757027 | 615 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
616 | ret = -EPERM; |
617 | goto end; | |
618 | } | |
6b757027 | 619 | if (!channel->enabled) { |
3c997079 MD |
620 | ret = -EEXIST; |
621 | goto end; | |
622 | } | |
623 | /* Set atomically the state to "disabled" */ | |
6b757027 | 624 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 625 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
626 | channel->priv->tstate = 0; |
627 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
628 | end: |
629 | mutex_unlock(&sessions_mutex); | |
630 | return ret; | |
e64957da MD |
631 | } |
632 | ||
9d993668 | 633 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 634 | { |
3c997079 | 635 | int ret = 0; |
e64957da | 636 | |
3c997079 | 637 | mutex_lock(&sessions_mutex); |
9d993668 MD |
638 | switch (event->type) { |
639 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
640 | { | |
641 | struct lttng_kernel_event_recorder *event_recorder = | |
642 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
643 | ||
f7d06400 | 644 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
645 | ret = -EPERM; |
646 | goto end; | |
647 | } | |
a0493bef | 648 | break; |
9d993668 MD |
649 | } |
650 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
651 | switch (event->priv->instrumentation) { | |
652 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
653 | ret = -EINVAL; | |
654 | goto end; | |
655 | default: | |
656 | break; | |
657 | } | |
a0493bef MD |
658 | break; |
659 | default: | |
9d993668 | 660 | break; |
a0493bef | 661 | } |
e64957da | 662 | |
9d993668 | 663 | if (event->enabled) { |
3c997079 MD |
664 | ret = -EEXIST; |
665 | goto end; | |
666 | } | |
a67ba386 | 667 | switch (event->priv->instrumentation) { |
c190d76e MJ |
668 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
669 | lttng_fallthrough; | |
606828e4 | 670 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
671 | ret = -EINVAL; |
672 | break; | |
b4a75708 | 673 | |
c190d76e MJ |
674 | case LTTNG_KERNEL_ABI_KPROBE: |
675 | lttng_fallthrough; | |
606828e4 | 676 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 677 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 678 | break; |
b4a75708 | 679 | |
606828e4 | 680 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 681 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 682 | break; |
b4a75708 | 683 | |
c190d76e MJ |
684 | case LTTNG_KERNEL_ABI_FUNCTION: |
685 | lttng_fallthrough; | |
686 | case LTTNG_KERNEL_ABI_NOOP: | |
687 | lttng_fallthrough; | |
a0493bef MD |
688 | default: |
689 | WARN_ON_ONCE(1); | |
690 | ret = -EINVAL; | |
691 | } | |
3c997079 MD |
692 | end: |
693 | mutex_unlock(&sessions_mutex); | |
694 | return ret; | |
e64957da MD |
695 | } |
696 | ||
9d993668 | 697 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
698 | { |
699 | int ret = 0; | |
700 | ||
701 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
702 | switch (event->type) { |
703 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
704 | { | |
705 | struct lttng_kernel_event_recorder *event_recorder = | |
706 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
707 | ||
f7d06400 | 708 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
709 | ret = -EPERM; |
710 | goto end; | |
711 | } | |
b01155ba | 712 | break; |
9d993668 MD |
713 | } |
714 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
715 | switch (event->priv->instrumentation) { | |
716 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
717 | ret = -EINVAL; | |
718 | goto end; | |
719 | default: | |
720 | break; | |
721 | } | |
2b16f0c9 | 722 | break; |
dffef45d | 723 | default: |
9d993668 | 724 | break; |
dffef45d | 725 | } |
dffef45d | 726 | |
a67ba386 | 727 | if (!event->enabled) { |
dffef45d FD |
728 | ret = -EEXIST; |
729 | goto end; | |
730 | } | |
a67ba386 | 731 | switch (event->priv->instrumentation) { |
c190d76e MJ |
732 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
733 | lttng_fallthrough; | |
606828e4 | 734 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
735 | ret = -EINVAL; |
736 | break; | |
b4a75708 | 737 | |
c190d76e MJ |
738 | case LTTNG_KERNEL_ABI_KPROBE: |
739 | lttng_fallthrough; | |
606828e4 | 740 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 741 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 742 | break; |
b4a75708 | 743 | |
9d993668 MD |
744 | case LTTNG_KERNEL_ABI_KRETPROBE: |
745 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
746 | break; | |
747 | ||
c190d76e MJ |
748 | case LTTNG_KERNEL_ABI_FUNCTION: |
749 | lttng_fallthrough; | |
750 | case LTTNG_KERNEL_ABI_NOOP: | |
751 | lttng_fallthrough; | |
dffef45d FD |
752 | default: |
753 | WARN_ON_ONCE(1); | |
754 | ret = -EINVAL; | |
755 | } | |
756 | end: | |
757 | mutex_unlock(&sessions_mutex); | |
758 | return ret; | |
759 | } | |
760 | ||
4e252d1e | 761 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
762 | const char *transport_name, |
763 | void *buf_addr, | |
4e3c1b9b MD |
764 | size_t subbuf_size, size_t num_subbuf, |
765 | unsigned int switch_timer_interval, | |
d83004aa JD |
766 | unsigned int read_timer_interval, |
767 | enum channel_type channel_type) | |
4e3c1b9b | 768 | { |
f7d06400 MD |
769 | struct lttng_kernel_channel_buffer *chan; |
770 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 771 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
772 | |
773 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 774 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 775 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 776 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 777 | if (!transport) { |
5a15f70c | 778 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 779 | transport_name); |
c0e31d2e | 780 | goto notransport; |
f3d01b96 | 781 | } |
a33c9927 | 782 | if (!try_module_get(transport->owner)) { |
5a15f70c | 783 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
784 | goto notransport; |
785 | } | |
f7d06400 | 786 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 787 | if (!chan) |
c0e31d2e | 788 | goto nomem; |
f7d06400 MD |
789 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
790 | if (!chan_priv) | |
791 | goto nomem_priv; | |
792 | chan->priv = chan_priv; | |
793 | chan_priv->pub = chan; | |
794 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
795 | chan->parent.session = session; | |
796 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 797 | chan->ops = &transport->ops; |
125b4df4 MD |
798 | /* |
799 | * Note: the channel creation op already writes into the packet | |
800 | * headers. Therefore the "chan" information used as input | |
801 | * should be already accessible. | |
802 | */ | |
f7d06400 | 803 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
804 | chan, buf_addr, subbuf_size, num_subbuf, |
805 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 806 | if (!chan->priv->rb_chan) |
f3d01b96 | 807 | goto create_error; |
f7d06400 MD |
808 | chan->priv->parent.tstate = 1; |
809 | chan->parent.enabled = 1; | |
810 | chan->priv->transport = transport; | |
811 | chan->priv->channel_type = channel_type; | |
812 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
813 | mutex_unlock(&sessions_mutex); |
814 | return chan; | |
815 | ||
f3d01b96 | 816 | create_error: |
f7d06400 MD |
817 | kfree(chan_priv); |
818 | nomem_priv: | |
f3d01b96 | 819 | kfree(chan); |
c0e31d2e | 820 | nomem: |
a33c9927 MD |
821 | if (transport) |
822 | module_put(transport->owner); | |
c0e31d2e | 823 | notransport: |
e5382b6d | 824 | active: |
4e3c1b9b MD |
825 | mutex_unlock(&sessions_mutex); |
826 | return NULL; | |
827 | } | |
828 | ||
829 | /* | |
d83004aa JD |
830 | * Only used internally at session destruction for per-cpu channels, and |
831 | * when metadata channel is released. | |
832 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 833 | */ |
aa7c23a9 | 834 | static |
f7d06400 | 835 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 836 | { |
f7d06400 MD |
837 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
838 | module_put(chan->priv->transport->owner); | |
839 | list_del(&chan->priv->node); | |
840 | lttng_kernel_destroy_context(chan->priv->ctx); | |
841 | kfree(chan->priv); | |
4e3c1b9b MD |
842 | kfree(chan); |
843 | } | |
844 | ||
f7d06400 | 845 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 846 | { |
f7d06400 | 847 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
848 | |
849 | /* Protect the metadata cache with the sessions_mutex. */ | |
850 | mutex_lock(&sessions_mutex); | |
851 | _lttng_channel_destroy(chan); | |
852 | mutex_unlock(&sessions_mutex); | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
855 | ||
856 | static | |
857 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
858 | { | |
859 | stream->finalized = 1; | |
860 | wake_up_interruptible(&stream->read_wait); | |
861 | } | |
862 | ||
51d248b5 MD |
863 | static |
864 | bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler) | |
865 | { | |
866 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
867 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
868 | ||
869 | switch (event_enabler->enabler_type) { | |
870 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
871 | { | |
872 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
873 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
874 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
875 | ||
876 | switch (itype) { | |
877 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
878 | lttng_fallthrough; | |
879 | case LTTNG_KERNEL_ABI_KPROBE: | |
880 | lttng_fallthrough; | |
881 | case LTTNG_KERNEL_ABI_SYSCALL: | |
882 | lttng_fallthrough; | |
883 | case LTTNG_KERNEL_ABI_UPROBE: | |
884 | if (chan->priv->free_event_id == -1U) | |
885 | return false; | |
886 | return true; | |
887 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
888 | /* kretprobes require 2 event IDs. */ | |
889 | if (chan->priv->free_event_id >= -2U) | |
890 | return false; | |
891 | return true; | |
892 | default: | |
893 | WARN_ON_ONCE(1); | |
894 | return false; | |
895 | } | |
896 | } | |
897 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
898 | return true; | |
899 | default: | |
900 | WARN_ON_ONCE(1); | |
901 | return false; | |
902 | } | |
903 | } | |
904 | ||
756a020c MD |
905 | static |
906 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
907 | { | |
908 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
909 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
910 | ||
911 | switch (event_enabler->enabler_type) { | |
912 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
913 | { | |
914 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
915 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
916 | struct lttng_kernel_event_recorder *event_recorder; | |
917 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
918 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
919 | ||
920 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
921 | if (!event_recorder) | |
922 | return NULL; | |
923 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
924 | if (!event_recorder_priv) { | |
925 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
926 | return NULL; | |
927 | } | |
928 | event_recorder_priv->pub = event_recorder; | |
929 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
930 | event_recorder->priv = event_recorder_priv; | |
931 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
932 | ||
933 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
934 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
935 | event_recorder->priv->parent.instrumentation = itype; | |
936 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
937 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
938 | ||
939 | event_recorder->chan = chan; | |
940 | event_recorder->priv->id = chan->priv->free_event_id++; | |
941 | return &event_recorder->parent; | |
942 | } | |
943 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
944 | { | |
945 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
946 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
947 | struct lttng_kernel_event_notifier *event_notifier; | |
948 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
949 | ||
950 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
951 | if (!event_notifier) | |
952 | return NULL; | |
953 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
954 | if (!event_notifier_priv) { | |
955 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
956 | return NULL; | |
957 | } | |
958 | event_notifier_priv->pub = event_notifier; | |
959 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
960 | event_notifier->priv = event_notifier_priv; | |
961 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
962 | ||
963 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
964 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
965 | event_notifier->priv->parent.instrumentation = itype; | |
966 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
967 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
968 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
969 | ||
970 | event_notifier->priv->group = event_notifier_enabler->group; | |
971 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
972 | event_notifier->priv->num_captures = 0; | |
973 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
974 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
975 | return &event_notifier->parent; | |
976 | } | |
977 | default: | |
978 | return NULL; | |
979 | } | |
980 | } | |
981 | ||
982 | static | |
983 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
984 | { | |
985 | switch (event->type) { | |
986 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
987 | { | |
988 | struct lttng_kernel_event_recorder *event_recorder = | |
989 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
990 | ||
991 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
992 | kmem_cache_free(event_recorder_cache, event_recorder); | |
993 | break; | |
994 | } | |
995 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
996 | { | |
997 | struct lttng_kernel_event_notifier *event_notifier = | |
998 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
999 | ||
1000 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1001 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1002 | break; | |
1003 | } | |
1004 | default: | |
1005 | WARN_ON_ONCE(1); | |
1006 | } | |
1007 | } | |
a101fa10 | 1008 | |
ccefc7ab MD |
1009 | static |
1010 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
1011 | { | |
1012 | switch (event->type) { | |
1013 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1014 | return 0; | |
1015 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1016 | { | |
1017 | struct lttng_kernel_event_notifier *event_notifier = | |
1018 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1019 | struct lttng_counter *error_counter; | |
1020 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
1021 | size_t dimension_index[1]; | |
1022 | int ret; | |
1023 | ||
1024 | /* | |
1025 | * Clear the error counter bucket. The sessiond keeps track of which | |
1026 | * bucket is currently in use. We trust it. The session lock | |
1027 | * synchronizes against concurrent creation of the error | |
1028 | * counter. | |
1029 | */ | |
1030 | error_counter = event_notifier_group->error_counter; | |
1031 | if (!error_counter) | |
1032 | return 0; | |
1033 | /* | |
1034 | * Check that the index is within the boundary of the counter. | |
1035 | */ | |
1036 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1037 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1038 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1039 | return -EINVAL; | |
1040 | } | |
1041 | ||
1042 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1043 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1044 | if (ret) { | |
1045 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1046 | event_notifier->priv->error_counter_index); | |
1047 | return -EINVAL; | |
1048 | } | |
1049 | return 0; | |
1050 | } | |
1051 | default: | |
1052 | return -EINVAL; | |
1053 | } | |
1054 | } | |
1055 | ||
e5382b6d MD |
1056 | /* |
1057 | * Supports event creation while tracing session is active. | |
3c997079 | 1058 | * Needs to be called with sessions mutex held. |
e5382b6d | 1059 | */ |
13a2dfca | 1060 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
def1e304 | 1061 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1062 | { |
13a2dfca MD |
1063 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
1064 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); | |
1065 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
def1e304 | 1066 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1067 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1068 | struct lttng_kernel_event_common *event; |
3c997079 MD |
1069 | const char *event_name; |
1070 | struct hlist_head *head; | |
3d084699 | 1071 | int ret; |
4e3c1b9b | 1072 | |
13a2dfca | 1073 | if (!lttng_kernel_event_id_available(event_enabler)) { |
4cf0bf51 | 1074 | ret = -EMFILE; |
e5382b6d | 1075 | goto full; |
abc0446a | 1076 | } |
3c997079 MD |
1077 | |
1078 | switch (itype) { | |
606828e4 | 1079 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1080 | event_name = event_desc->event_name; |
3c997079 | 1081 | break; |
b4a75708 | 1082 | |
c190d76e MJ |
1083 | case LTTNG_KERNEL_ABI_KPROBE: |
1084 | lttng_fallthrough; | |
1085 | case LTTNG_KERNEL_ABI_UPROBE: | |
1086 | lttng_fallthrough; | |
1087 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1088 | lttng_fallthrough; | |
606828e4 | 1089 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1090 | event_name = event_param->name; |
1091 | break; | |
b4a75708 | 1092 | |
c190d76e MJ |
1093 | case LTTNG_KERNEL_ABI_FUNCTION: |
1094 | lttng_fallthrough; | |
1095 | case LTTNG_KERNEL_ABI_NOOP: | |
1096 | lttng_fallthrough; | |
3c997079 MD |
1097 | default: |
1098 | WARN_ON_ONCE(1); | |
1099 | ret = -EINVAL; | |
1100 | goto type_error; | |
1101 | } | |
4a11ef1c | 1102 | |
0def9170 | 1103 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1104 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
13a2dfca | 1105 | if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) { |
3c997079 MD |
1106 | ret = -EEXIST; |
1107 | goto exist; | |
abc0446a MD |
1108 | } |
1109 | } | |
3c997079 | 1110 | |
13a2dfca | 1111 | event = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1112 | if (!event) { |
4cf0bf51 | 1113 | ret = -ENOMEM; |
756a020c | 1114 | goto alloc_error; |
abc0446a | 1115 | } |
3c997079 MD |
1116 | |
1117 | switch (itype) { | |
606828e4 | 1118 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1119 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1120 | event->enabled = 0; |
1121 | event->priv->registered = 0; | |
1122 | event->priv->desc = lttng_event_desc_get(event_name); | |
1123 | if (!event->priv->desc) { | |
4cf0bf51 | 1124 | ret = -ENOENT; |
d3dbe23c | 1125 | goto register_error; |
abc0446a | 1126 | } |
3c997079 MD |
1127 | /* Populate lttng_event structure before event registration. */ |
1128 | smp_wmb(); | |
baf20995 | 1129 | break; |
b4a75708 | 1130 | |
606828e4 | 1131 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1132 | /* |
1133 | * Needs to be explicitly enabled after creation, since | |
1134 | * we may want to apply filters. | |
1135 | */ | |
7cd0f696 MD |
1136 | event->enabled = 0; |
1137 | event->priv->registered = 1; | |
3c997079 MD |
1138 | /* |
1139 | * Populate lttng_event structure before event | |
1140 | * registration. | |
1141 | */ | |
1142 | smp_wmb(); | |
8bf17deb | 1143 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1144 | event_param->u.kprobe.symbol_name, |
1145 | event_param->u.kprobe.offset, | |
1146 | event_param->u.kprobe.addr, | |
7cd0f696 | 1147 | event); |
abc0446a | 1148 | if (ret) { |
4cf0bf51 | 1149 | ret = -EINVAL; |
d6d808f3 | 1150 | goto register_error; |
abc0446a | 1151 | } |
7cd0f696 | 1152 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1153 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1154 | break; |
b4a75708 | 1155 | |
606828e4 | 1156 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1157 | { |
756a020c | 1158 | struct lttng_kernel_event_common *event_return; |
7371f44c MD |
1159 | |
1160 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1161 | /* |
1162 | * Needs to be explicitly enabled after creation, since | |
1163 | * we may want to apply filters. | |
1164 | */ | |
756a020c MD |
1165 | event->enabled = 0; |
1166 | event->priv->registered = 1; | |
a67ba386 | 1167 | |
13a2dfca | 1168 | event_return = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1169 | if (!event) { |
a67ba386 | 1170 | ret = -ENOMEM; |
756a020c | 1171 | goto alloc_error; |
a67ba386 | 1172 | } |
756a020c MD |
1173 | |
1174 | event_return->enabled = 0; | |
1175 | event_return->priv->registered = 1; | |
1176 | ||
7371f44c | 1177 | /* |
a90917c3 | 1178 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1179 | */ |
1180 | smp_wmb(); | |
3c997079 | 1181 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1182 | event_param->u.kretprobe.symbol_name, |
1183 | event_param->u.kretprobe.offset, | |
1184 | event_param->u.kretprobe.addr, | |
756a020c | 1185 | event, event_return); |
7371f44c | 1186 | if (ret) { |
756a020c | 1187 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1188 | ret = -EINVAL; |
7371f44c MD |
1189 | goto register_error; |
1190 | } | |
1191 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1192 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1193 | WARN_ON_ONCE(!ret); |
756a020c | 1194 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1195 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1196 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1197 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1198 | if (ret) { |
756a020c | 1199 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1200 | module_put(event_return->priv->desc->owner); |
1201 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1202 | goto statedump_error; |
1203 | } | |
19b98250 | 1204 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1205 | break; |
1206 | } | |
b4a75708 | 1207 | |
606828e4 | 1208 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1209 | /* |
1210 | * Needs to be explicitly enabled after creation, since | |
1211 | * we may want to apply filters. | |
1212 | */ | |
7cd0f696 MD |
1213 | event->enabled = 0; |
1214 | event->priv->registered = 0; | |
1215 | event->priv->desc = event_desc; | |
badfe9f5 | 1216 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1217 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1218 | ret = -EINVAL; |
1219 | goto register_error; | |
606828e4 | 1220 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1221 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1222 | break; |
606828e4 | 1223 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1224 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1225 | break; |
1226 | } | |
1227 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1228 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1229 | ret = -EINVAL; |
1230 | goto register_error; | |
606828e4 | 1231 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1232 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1233 | break; |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1235 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1236 | break; |
1237 | } | |
7cd0f696 | 1238 | if (!event->priv->desc) { |
4cf0bf51 | 1239 | ret = -EINVAL; |
259b6cb3 | 1240 | goto register_error; |
abc0446a | 1241 | } |
1ec65de1 | 1242 | break; |
b4a75708 | 1243 | |
606828e4 | 1244 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1245 | /* |
1246 | * Needs to be explicitly enabled after creation, since | |
1247 | * we may want to apply filters. | |
1248 | */ | |
7cd0f696 MD |
1249 | event->enabled = 0; |
1250 | event->priv->registered = 1; | |
3aed4dca | 1251 | |
a344f64b FD |
1252 | /* |
1253 | * Populate lttng_event structure before event | |
1254 | * registration. | |
1255 | */ | |
1256 | smp_wmb(); | |
149b9a9d | 1257 | |
83b802dc | 1258 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1259 | event_param->u.uprobe.fd, |
7cd0f696 | 1260 | event); |
149b9a9d YB |
1261 | if (ret) |
1262 | goto register_error; | |
7cd0f696 | 1263 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1264 | WARN_ON_ONCE(!ret); |
1265 | break; | |
b4a75708 | 1266 | |
c190d76e MJ |
1267 | case LTTNG_KERNEL_ABI_FUNCTION: |
1268 | lttng_fallthrough; | |
1269 | case LTTNG_KERNEL_ABI_NOOP: | |
1270 | lttng_fallthrough; | |
baf20995 MD |
1271 | default: |
1272 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1273 | ret = -EINVAL; |
df07930b | 1274 | goto register_error; |
baf20995 | 1275 | } |
13a2dfca | 1276 | |
ee7e9a18 | 1277 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1278 | WARN_ON_ONCE(ret > 0); |
1279 | if (ret) { | |
c099397a | 1280 | goto statedump_error; |
abc0446a | 1281 | } |
dffef45d | 1282 | |
ccefc7ab MD |
1283 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1284 | if (ret) | |
1285 | goto register_error; | |
c4e31059 | 1286 | |
c4e31059 | 1287 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1288 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1289 | |
13a2dfca | 1290 | return event; |
dffef45d | 1291 | |
13a2dfca MD |
1292 | statedump_error: |
1293 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1294 | register_error: |
756a020c MD |
1295 | lttng_kernel_event_free(event); |
1296 | alloc_error: | |
dffef45d FD |
1297 | exist: |
1298 | type_error: | |
13a2dfca | 1299 | full: |
dffef45d FD |
1300 | return ERR_PTR(ret); |
1301 | } | |
1302 | ||
83006ee0 MD |
1303 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1304 | const struct lttng_kernel_event_desc *event_desc) | |
1305 | { | |
1306 | struct lttng_kernel_event_common *event; | |
1307 | ||
1308 | mutex_lock(&sessions_mutex); | |
1309 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1310 | mutex_unlock(&sessions_mutex); | |
1311 | return event; | |
1312 | } | |
1313 | ||
99f52fcc FD |
1314 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1315 | const size_t *dim_indexes, int32_t cpu, | |
1316 | int64_t *val, bool *overflow, bool *underflow) | |
1317 | { | |
1318 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1319 | cpu, val, overflow, underflow); | |
1320 | } | |
1321 | ||
1322 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1323 | const size_t *dim_indexes, int64_t *val, | |
1324 | bool *overflow, bool *underflow) | |
1325 | { | |
1326 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1327 | val, overflow, underflow); | |
1328 | } | |
1329 | ||
1330 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1331 | const size_t *dim_indexes) | |
1332 | { | |
1333 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1334 | } | |
1335 | ||
6a338ba4 | 1336 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1337 | static |
0c851fa0 | 1338 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1339 | { |
437d5aa5 | 1340 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1341 | int ret = -EINVAL; |
3c997079 | 1342 | |
6a338ba4 | 1343 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1344 | |
0c851fa0 MD |
1345 | desc = event->priv->desc; |
1346 | switch (event->priv->instrumentation) { | |
606828e4 | 1347 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1348 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1349 | desc->tp_class->probe_callback, |
0c851fa0 | 1350 | event); |
4ecb5ad5 | 1351 | break; |
b4a75708 | 1352 | |
606828e4 | 1353 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1354 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1355 | break; |
b4a75708 | 1356 | |
c190d76e MJ |
1357 | case LTTNG_KERNEL_ABI_KPROBE: |
1358 | lttng_fallthrough; | |
1359 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1360 | ret = 0; |
f0bcc14c | 1361 | break; |
0c851fa0 MD |
1362 | |
1363 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1364 | switch (event->type) { | |
1365 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1366 | ret = 0; | |
1367 | break; | |
1368 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1369 | WARN_ON_ONCE(1); | |
1370 | break; | |
1371 | } | |
4ecb5ad5 | 1372 | break; |
b4a75708 | 1373 | |
c190d76e MJ |
1374 | case LTTNG_KERNEL_ABI_FUNCTION: |
1375 | lttng_fallthrough; | |
1376 | case LTTNG_KERNEL_ABI_NOOP: | |
1377 | lttng_fallthrough; | |
4ecb5ad5 MD |
1378 | default: |
1379 | WARN_ON_ONCE(1); | |
1380 | } | |
6a338ba4 | 1381 | WARN_ON_ONCE(ret); |
3c997079 | 1382 | if (!ret) |
0c851fa0 | 1383 | event->priv->registered = 1; |
3c997079 MD |
1384 | } |
1385 | ||
6a338ba4 MD |
1386 | static |
1387 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1388 | { |
f0bcc14c | 1389 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1390 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1391 | int ret = -EINVAL; |
1392 | ||
6a338ba4 | 1393 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1394 | |
a67ba386 MD |
1395 | desc = event_priv->desc; |
1396 | switch (event_priv->instrumentation) { | |
606828e4 | 1397 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1398 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1399 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1400 | event); |
baf20995 | 1401 | break; |
b4a75708 | 1402 | |
606828e4 | 1403 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1404 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1405 | ret = 0; |
1406 | break; | |
b4a75708 | 1407 | |
606828e4 | 1408 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1409 | switch (event->type) { |
1410 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1411 | lttng_kretprobes_unregister(event); | |
1412 | ret = 0; | |
1413 | break; | |
1414 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1415 | WARN_ON_ONCE(1); | |
1416 | break; | |
1417 | } | |
7371f44c | 1418 | break; |
b4a75708 | 1419 | |
606828e4 | 1420 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1421 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1422 | break; |
b4a75708 | 1423 | |
606828e4 | 1424 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1425 | switch (event->type) { |
1426 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1427 | ret = 0; | |
1428 | break; | |
1429 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1430 | WARN_ON_ONCE(1); | |
1431 | break; | |
1432 | } | |
259b6cb3 | 1433 | break; |
b4a75708 | 1434 | |
606828e4 | 1435 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1436 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1437 | ret = 0; |
1438 | break; | |
b4a75708 | 1439 | |
c190d76e MJ |
1440 | case LTTNG_KERNEL_ABI_FUNCTION: |
1441 | lttng_fallthrough; | |
baf20995 MD |
1442 | default: |
1443 | WARN_ON_ONCE(1); | |
1444 | } | |
6a338ba4 | 1445 | WARN_ON_ONCE(ret); |
3c997079 | 1446 | if (!ret) |
a67ba386 | 1447 | event_priv->registered = 0; |
6a338ba4 MD |
1448 | } |
1449 | ||
1450 | static | |
1451 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1452 | { | |
1453 | if (event->priv->registered) | |
1454 | unregister_event(event); | |
dda6a249 MD |
1455 | } |
1456 | ||
1457 | /* | |
1458 | * Only used internally at session destruction. | |
1459 | */ | |
be066e6c | 1460 | static |
0648898e | 1461 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1462 | { |
0648898e | 1463 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1464 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1465 | ||
0648898e MD |
1466 | lttng_free_event_filter_runtime(event); |
1467 | /* Free event enabler refs */ | |
1468 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1469 | &event_priv->enablers_ref_head, node) | |
1470 | kfree(enabler_ref); | |
b4a75708 | 1471 | |
0648898e MD |
1472 | switch (event->type) { |
1473 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1474 | { | |
1475 | struct lttng_kernel_event_recorder *event_recorder = | |
1476 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1477 | |
0648898e MD |
1478 | switch (event_priv->instrumentation) { |
1479 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1480 | lttng_event_desc_put(event_priv->desc); | |
1481 | break; | |
b4a75708 | 1482 | |
0648898e MD |
1483 | case LTTNG_KERNEL_ABI_KPROBE: |
1484 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1485 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1486 | break; |
b4a75708 | 1487 | |
0648898e MD |
1488 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1489 | module_put(event_priv->desc->owner); | |
eb6b47db | 1490 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1491 | break; |
b4a75708 | 1492 | |
0648898e MD |
1493 | case LTTNG_KERNEL_ABI_SYSCALL: |
1494 | break; | |
4e3c1b9b | 1495 | |
0648898e MD |
1496 | case LTTNG_KERNEL_ABI_UPROBE: |
1497 | module_put(event_priv->desc->owner); | |
17806c46 | 1498 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1499 | break; |
3ef5cc03 | 1500 | |
c190d76e MJ |
1501 | case LTTNG_KERNEL_ABI_FUNCTION: |
1502 | lttng_fallthrough; | |
1503 | case LTTNG_KERNEL_ABI_NOOP: | |
1504 | lttng_fallthrough; | |
0648898e MD |
1505 | default: |
1506 | WARN_ON_ONCE(1); | |
1507 | } | |
f237aef8 | 1508 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1509 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1510 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1511 | break; |
0648898e MD |
1512 | } |
1513 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1514 | { | |
1515 | struct lttng_kernel_event_notifier *event_notifier = | |
1516 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1517 | |
0648898e MD |
1518 | switch (event_notifier->priv->parent.instrumentation) { |
1519 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1520 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1521 | break; | |
b4a75708 | 1522 | |
0648898e MD |
1523 | case LTTNG_KERNEL_ABI_KPROBE: |
1524 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1525 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1526 | break; |
b4a75708 | 1527 | |
0648898e MD |
1528 | case LTTNG_KERNEL_ABI_SYSCALL: |
1529 | break; | |
b4a75708 | 1530 | |
0648898e MD |
1531 | case LTTNG_KERNEL_ABI_UPROBE: |
1532 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1533 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1534 | break; |
1535 | ||
c190d76e MJ |
1536 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1537 | lttng_fallthrough; | |
1538 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1539 | lttng_fallthrough; | |
1540 | case LTTNG_KERNEL_ABI_NOOP: | |
1541 | lttng_fallthrough; | |
0648898e MD |
1542 | default: |
1543 | WARN_ON_ONCE(1); | |
1544 | } | |
f237aef8 | 1545 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1546 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1547 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1548 | break; | |
1549 | } | |
dffef45d FD |
1550 | default: |
1551 | WARN_ON_ONCE(1); | |
1552 | } | |
dffef45d FD |
1553 | } |
1554 | ||
8c0393c3 | 1555 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1556 | enum tracker_type tracker_type) |
e0130fab | 1557 | { |
d1f652f8 MD |
1558 | switch (tracker_type) { |
1559 | case TRACKER_PID: | |
1560 | return &session->pid_tracker; | |
1561 | case TRACKER_VPID: | |
1562 | return &session->vpid_tracker; | |
1563 | case TRACKER_UID: | |
1564 | return &session->uid_tracker; | |
1565 | case TRACKER_VUID: | |
1566 | return &session->vuid_tracker; | |
1567 | case TRACKER_GID: | |
1568 | return &session->gid_tracker; | |
1569 | case TRACKER_VGID: | |
1570 | return &session->vgid_tracker; | |
1571 | default: | |
1572 | WARN_ON_ONCE(1); | |
1573 | return NULL; | |
1574 | } | |
1575 | } | |
1576 | ||
8cdc1a81 | 1577 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1578 | enum tracker_type tracker_type, int id) |
1579 | { | |
8c0393c3 | 1580 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1581 | int ret; |
1582 | ||
d1f652f8 MD |
1583 | tracker = get_tracker(session, tracker_type); |
1584 | if (!tracker) | |
1585 | return -EINVAL; | |
1586 | if (id < -1) | |
e0130fab MD |
1587 | return -EINVAL; |
1588 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1589 | if (id == -1) { |
1590 | /* track all ids: destroy tracker. */ | |
1591 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1592 | ret = 0; |
1593 | } else { | |
d1f652f8 | 1594 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1595 | } |
e0130fab MD |
1596 | mutex_unlock(&sessions_mutex); |
1597 | return ret; | |
1598 | } | |
1599 | ||
8cdc1a81 | 1600 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1601 | enum tracker_type tracker_type, int id) |
e0130fab | 1602 | { |
8c0393c3 | 1603 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1604 | int ret; |
1605 | ||
d1f652f8 MD |
1606 | tracker = get_tracker(session, tracker_type); |
1607 | if (!tracker) | |
1608 | return -EINVAL; | |
1609 | if (id < -1) | |
e0130fab MD |
1610 | return -EINVAL; |
1611 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1612 | if (id == -1) { |
1613 | /* untrack all ids: replace by empty tracker. */ | |
1614 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1615 | } else { |
d1f652f8 | 1616 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1617 | } |
e0130fab MD |
1618 | mutex_unlock(&sessions_mutex); |
1619 | return ret; | |
1620 | } | |
1621 | ||
7e6f9ef6 | 1622 | static |
d1f652f8 | 1623 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1624 | { |
8c0393c3 MD |
1625 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1626 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1627 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1628 | int iter = 0, i; |
1629 | ||
1630 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1631 | if (id_tracker_p) { |
1632 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1633 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1634 | |
f934e302 | 1635 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1636 | if (iter++ >= *pos) |
1637 | return e; | |
1638 | } | |
1639 | } | |
1640 | } else { | |
d1f652f8 | 1641 | /* ID tracker disabled. */ |
7e6f9ef6 | 1642 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1643 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1644 | } |
1645 | iter++; | |
1646 | } | |
1647 | /* End of list */ | |
1648 | return NULL; | |
1649 | } | |
1650 | ||
1651 | /* Called with sessions_mutex held. */ | |
1652 | static | |
d1f652f8 | 1653 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1654 | { |
8c0393c3 MD |
1655 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1656 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1657 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1658 | int iter = 0, i; |
1659 | ||
1660 | (*ppos)++; | |
d1f652f8 MD |
1661 | if (id_tracker_p) { |
1662 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1663 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1664 | |
f934e302 | 1665 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1666 | if (iter++ >= *ppos) |
1667 | return e; | |
1668 | } | |
1669 | } | |
1670 | } else { | |
d1f652f8 | 1671 | /* ID tracker disabled. */ |
7e6f9ef6 | 1672 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1673 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1674 | iter++; |
1675 | } | |
1676 | ||
1677 | /* End of list */ | |
1678 | return NULL; | |
1679 | } | |
1680 | ||
1681 | static | |
d1f652f8 | 1682 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1683 | { |
1684 | mutex_unlock(&sessions_mutex); | |
1685 | } | |
1686 | ||
1687 | static | |
d1f652f8 | 1688 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1689 | { |
8c0393c3 MD |
1690 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1691 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1692 | int id; |
7e6f9ef6 | 1693 | |
d1f652f8 | 1694 | if (p == id_tracker_p) { |
7e6f9ef6 | 1695 | /* Tracker disabled. */ |
d1f652f8 | 1696 | id = -1; |
7e6f9ef6 | 1697 | } else { |
d1f652f8 | 1698 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1699 | |
d1f652f8 MD |
1700 | id = lttng_id_tracker_get_node_id(e); |
1701 | } | |
8c0393c3 | 1702 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1703 | case TRACKER_PID: |
1704 | seq_printf(m, "process { pid = %d; };\n", id); | |
1705 | break; | |
1706 | case TRACKER_VPID: | |
1707 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1708 | break; | |
1709 | case TRACKER_UID: | |
1710 | seq_printf(m, "user { uid = %d; };\n", id); | |
1711 | break; | |
1712 | case TRACKER_VUID: | |
1713 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1714 | break; | |
1715 | case TRACKER_GID: | |
1716 | seq_printf(m, "group { gid = %d; };\n", id); | |
1717 | break; | |
1718 | case TRACKER_VGID: | |
1719 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1720 | break; | |
1721 | default: | |
1722 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1723 | } |
7e6f9ef6 MD |
1724 | return 0; |
1725 | } | |
1726 | ||
1727 | static | |
d1f652f8 MD |
1728 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1729 | .start = id_list_start, | |
1730 | .next = id_list_next, | |
1731 | .stop = id_list_stop, | |
1732 | .show = id_list_show, | |
7e6f9ef6 MD |
1733 | }; |
1734 | ||
1735 | static | |
d1f652f8 | 1736 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1737 | { |
d1f652f8 | 1738 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1739 | } |
1740 | ||
1741 | static | |
d1f652f8 | 1742 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1743 | { |
1744 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1745 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1746 | int ret; |
1747 | ||
d1f652f8 | 1748 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1749 | ret = seq_release(inode, file); |
d1f652f8 | 1750 | if (!ret) |
8c0393c3 | 1751 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1752 | return ret; |
1753 | } | |
1754 | ||
d1f652f8 | 1755 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1756 | .owner = THIS_MODULE, |
d1f652f8 | 1757 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1758 | .read = seq_read, |
1759 | .llseek = seq_lseek, | |
d1f652f8 | 1760 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1761 | }; |
1762 | ||
8cdc1a81 | 1763 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1764 | enum tracker_type tracker_type) |
7e6f9ef6 | 1765 | { |
d1f652f8 | 1766 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1767 | struct seq_file *m; |
1768 | int file_fd, ret; | |
1769 | ||
1770 | file_fd = lttng_get_unused_fd(); | |
1771 | if (file_fd < 0) { | |
1772 | ret = file_fd; | |
1773 | goto fd_error; | |
1774 | } | |
1775 | ||
d1f652f8 MD |
1776 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1777 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1778 | NULL, O_RDWR); |
d1f652f8 MD |
1779 | if (IS_ERR(tracker_ids_list_file)) { |
1780 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1781 | goto file_error; |
1782 | } | |
8cdc1a81 | 1783 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1784 | ret = -EOVERFLOW; |
9c1f4643 MD |
1785 | goto refcount_error; |
1786 | } | |
d1f652f8 | 1787 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1788 | if (ret < 0) |
1789 | goto open_error; | |
d1f652f8 MD |
1790 | m = tracker_ids_list_file->private_data; |
1791 | ||
1792 | m->private = get_tracker(session, tracker_type); | |
1793 | BUG_ON(!m->private); | |
1794 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1795 | |
1796 | return file_fd; | |
1797 | ||
1798 | open_error: | |
8cdc1a81 | 1799 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1800 | refcount_error: |
d1f652f8 | 1801 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1802 | file_error: |
1803 | put_unused_fd(file_fd); | |
1804 | fd_error: | |
1805 | return ret; | |
1806 | } | |
1807 | ||
3c997079 MD |
1808 | /* |
1809 | * Enabler management. | |
1810 | */ | |
1811 | static | |
4993071a PP |
1812 | int lttng_match_enabler_star_glob(const char *desc_name, |
1813 | const char *pattern) | |
3c997079 | 1814 | { |
cbc19040 MD |
1815 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1816 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1817 | return 0; |
1818 | return 1; | |
1819 | } | |
1820 | ||
1821 | static | |
4ecb5ad5 MD |
1822 | int lttng_match_enabler_name(const char *desc_name, |
1823 | const char *name) | |
3c997079 | 1824 | { |
4ecb5ad5 | 1825 | if (strcmp(desc_name, name)) |
3c997079 MD |
1826 | return 0; |
1827 | return 1; | |
1828 | } | |
1829 | ||
8bff0fc3 MD |
1830 | static |
1831 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1832 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1833 | { |
4ecb5ad5 | 1834 | const char *desc_name, *enabler_name; |
badfe9f5 | 1835 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1836 | |
1837 | enabler_name = enabler->event_param.name; | |
1838 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1839 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1840 | desc_name = desc->event_name; |
3b861b22 FD |
1841 | switch (enabler->format_type) { |
1842 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1843 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1844 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1845 | return lttng_match_enabler_name(desc_name, enabler_name); |
1846 | default: | |
1847 | return -EINVAL; | |
1848 | } | |
4ecb5ad5 | 1849 | break; |
b4a75708 | 1850 | |
606828e4 | 1851 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1852 | desc_name = desc->event_name; |
badfe9f5 | 1853 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1854 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1855 | compat = true; |
1856 | } | |
4ecb5ad5 MD |
1857 | if (!strncmp(desc_name, "syscall_exit_", |
1858 | strlen("syscall_exit_"))) { | |
1859 | desc_name += strlen("syscall_exit_"); | |
1860 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1861 | strlen("syscall_entry_"))) { | |
1862 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1863 | entry = true; |
4ecb5ad5 MD |
1864 | } else { |
1865 | WARN_ON_ONCE(1); | |
1866 | return -EINVAL; | |
1867 | } | |
badfe9f5 | 1868 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1869 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1870 | break; |
606828e4 | 1871 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1872 | if (!entry) |
1873 | return 0; | |
1874 | break; | |
606828e4 | 1875 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1876 | if (entry) |
1877 | return 0; | |
1878 | break; | |
1879 | default: | |
1880 | return -EINVAL; | |
1881 | } | |
1882 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1883 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1884 | break; |
606828e4 | 1885 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1886 | if (compat) |
1887 | return 0; | |
1888 | break; | |
606828e4 | 1889 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1890 | if (!compat) |
1891 | return 0; | |
1892 | break; | |
1893 | default: | |
1894 | return -EINVAL; | |
1895 | } | |
1896 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1897 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1898 | switch (enabler->format_type) { |
1899 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1900 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1901 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1902 | return lttng_match_enabler_name(desc_name, enabler_name); |
1903 | default: | |
1904 | return -EINVAL; | |
1905 | } | |
1906 | break; | |
606828e4 | 1907 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1908 | return -EINVAL; /* Not implemented. */ |
1909 | default: | |
1910 | return -EINVAL; | |
1911 | } | |
4ecb5ad5 | 1912 | break; |
b4a75708 | 1913 | |
4ecb5ad5 MD |
1914 | default: |
1915 | WARN_ON_ONCE(1); | |
1916 | return -EINVAL; | |
1917 | } | |
3c997079 MD |
1918 | } |
1919 | ||
8bff0fc3 MD |
1920 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1921 | struct lttng_event_enabler_common *enabler) | |
1922 | { | |
1923 | int ret; | |
1924 | ||
1925 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1926 | if (ret < 0) { | |
1927 | WARN_ON_ONCE(1); | |
1928 | return false; | |
1929 | } | |
1930 | return ret; | |
1931 | } | |
1932 | ||
5c6ec66a MD |
1933 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1934 | struct lttng_kernel_event_common *event) | |
3c997079 | 1935 | { |
5c6ec66a MD |
1936 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1937 | return false; | |
b2bc0bc8 | 1938 | |
5c6ec66a MD |
1939 | switch (event_enabler->enabler_type) { |
1940 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1941 | { | |
1942 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1943 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1944 | struct lttng_kernel_event_recorder *event_recorder = | |
1945 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1946 | ||
1947 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1948 | && event_recorder->chan == event_recorder_enabler->chan) | |
1949 | return true; | |
1950 | else | |
1951 | return false; | |
1952 | } | |
1953 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1954 | { | |
1955 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1956 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1957 | struct lttng_kernel_event_notifier *event_notifier = | |
1958 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1959 | ||
1960 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1961 | && event_notifier->priv->group == event_notifier_enabler->group | |
1962 | && event->priv->user_token == event_enabler->user_token) | |
1963 | return true; | |
1964 | else | |
1965 | return false; | |
1966 | } | |
1967 | default: | |
1968 | WARN_ON_ONCE(1); | |
1969 | return false; | |
1970 | } | |
3c997079 MD |
1971 | } |
1972 | ||
5c6ec66a MD |
1973 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1974 | const struct lttng_kernel_event_desc *desc, | |
1975 | struct lttng_kernel_event_common *event) | |
b01155ba | 1976 | { |
5c6ec66a MD |
1977 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1978 | return false; | |
b01155ba | 1979 | |
5c6ec66a MD |
1980 | switch (event_enabler->enabler_type) { |
1981 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1982 | { | |
1983 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1984 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1985 | struct lttng_kernel_event_recorder *event_recorder = | |
1986 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1987 | ||
1988 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1989 | return true; | |
1990 | else | |
1991 | return false; | |
1992 | } | |
1993 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1994 | { | |
1995 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1996 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1997 | struct lttng_kernel_event_notifier *event_notifier = | |
1998 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1999 | ||
2000 | if (event->priv->desc == desc | |
2001 | && event_notifier->priv->group == event_notifier_enabler->group | |
2002 | && event->priv->user_token == event_enabler->user_token) | |
2003 | return true; | |
2004 | else | |
2005 | return false; | |
2006 | } | |
2007 | default: | |
2008 | WARN_ON_ONCE(1); | |
2009 | return false; | |
2010 | } | |
b01155ba FD |
2011 | } |
2012 | ||
0d223dc6 MD |
2013 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2014 | const char *event_name, | |
2015 | struct lttng_kernel_event_common *event) | |
2016 | { | |
2017 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2018 | return false; | |
2019 | ||
2020 | switch (event_enabler->enabler_type) { | |
2021 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2022 | { | |
2023 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2024 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2025 | struct lttng_kernel_event_recorder *event_recorder = | |
2026 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2027 | ||
2028 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2029 | && event_recorder->chan == event_recorder_enabler->chan) | |
2030 | return true; | |
2031 | else | |
2032 | return false; | |
2033 | } | |
2034 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2035 | { | |
2036 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2037 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2038 | struct lttng_kernel_event_notifier *event_notifier = | |
2039 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2040 | ||
2041 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2042 | && event_notifier->priv->group == event_notifier_enabler->group | |
2043 | && event->priv->user_token == event_enabler->user_token) | |
2044 | return true; | |
2045 | else | |
2046 | return false; | |
2047 | } | |
2048 | default: | |
2049 | WARN_ON_ONCE(1); | |
2050 | return false; | |
2051 | } | |
2052 | } | |
2053 | ||
3c997079 | 2054 | static |
b2bc0bc8 FD |
2055 | struct lttng_enabler_ref *lttng_enabler_ref( |
2056 | struct list_head *enablers_ref_list, | |
8d554755 | 2057 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2058 | { |
2059 | struct lttng_enabler_ref *enabler_ref; | |
2060 | ||
b2bc0bc8 | 2061 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2062 | if (enabler_ref->ref == enabler) |
2063 | return enabler_ref; | |
2064 | } | |
2065 | return NULL; | |
2066 | } | |
2067 | ||
3c997079 | 2068 | static |
b2f63bde | 2069 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2070 | { |
c8e14380 | 2071 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2072 | struct lttng_kernel_probe_desc *probe_desc; |
2073 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2074 | struct list_head *probe_list; |
c8e14380 | 2075 | int i; |
3c997079 MD |
2076 | |
2077 | probe_list = lttng_get_probe_list_head(); | |
2078 | /* | |
2079 | * For each probe event, if we find that a probe event matches | |
2080 | * our enabler, create an associated lttng_event if not | |
2081 | * already present. | |
2082 | */ | |
2083 | list_for_each_entry(probe_desc, probe_list, head) { | |
2084 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2085 | bool found = false; |
3c997079 | 2086 | struct hlist_head *head; |
83006ee0 | 2087 | struct lttng_kernel_event_common *event; |
19bef247 | 2088 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2089 | |
2090 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2091 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2092 | continue; |
3c997079 MD |
2093 | |
2094 | /* | |
2095 | * Check if already created. | |
2096 | */ | |
0def9170 | 2097 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2098 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2099 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2100 | found = true; | |
2101 | break; | |
2102 | } | |
3c997079 MD |
2103 | } |
2104 | if (found) | |
2105 | continue; | |
2106 | ||
2107 | /* | |
83006ee0 | 2108 | * We need to create an event for this event probe. |
3c997079 | 2109 | */ |
c8e14380 | 2110 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2111 | if (IS_ERR(event)) { |
5a15f70c | 2112 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2113 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2114 | } |
2115 | } | |
2116 | } | |
2117 | } | |
2118 | ||
33a39a3c | 2119 | /* |
8839618b | 2120 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2121 | * Should be called with sessions mutex held. |
2122 | */ | |
2123 | static | |
b2f63bde | 2124 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2125 | { |
b2f63bde MD |
2126 | int ret; |
2127 | ||
8839618b | 2128 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2129 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2130 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2131 | break; |
b4a75708 | 2132 | |
606828e4 | 2133 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2134 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2135 | WARN_ON_ONCE(ret); | |
33a39a3c | 2136 | break; |
b4a75708 | 2137 | |
33a39a3c MD |
2138 | default: |
2139 | WARN_ON_ONCE(1); | |
2140 | break; | |
2141 | } | |
2142 | } | |
2143 | ||
d619fae9 MD |
2144 | static |
2145 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2146 | struct lttng_kernel_event_common *event) | |
2147 | { | |
2148 | /* Link filter bytecodes if not linked yet. */ | |
2149 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2150 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2151 | } | |
2152 | ||
1e06b222 MD |
2153 | static |
2154 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2155 | struct lttng_kernel_event_common *event) | |
2156 | { | |
2157 | switch (event_enabler->enabler_type) { | |
2158 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2159 | break; | |
2160 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2161 | { | |
2162 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2163 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2164 | struct lttng_kernel_event_notifier *event_notifier = | |
2165 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2166 | ||
2167 | /* Link capture bytecodes if not linked yet. */ | |
2168 | lttng_enabler_link_bytecode(event->priv->desc, | |
2169 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2170 | &event_notifier_enabler->capture_bytecode_head); | |
2171 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2172 | break; | |
2173 | } | |
2174 | default: | |
2175 | WARN_ON_ONCE(1); | |
2176 | } | |
2177 | } | |
2178 | ||
3c997079 | 2179 | /* |
b2bc0bc8 | 2180 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2181 | * and add backward reference from the event to the enabler. |
2182 | * Should be called with sessions mutex held. | |
2183 | */ | |
2184 | static | |
3622cd47 | 2185 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2186 | { |
3622cd47 MD |
2187 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2188 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2189 | |
3622cd47 | 2190 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2191 | |
3c997079 | 2192 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2193 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2194 | |
3622cd47 MD |
2195 | /* Link the created event with its associated enabler. */ |
2196 | list_for_each_entry(event_priv, event_list_head, node) { | |
2197 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2198 | struct lttng_enabler_ref *enabler_ref; |
2199 | ||
3622cd47 | 2200 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2201 | continue; |
2202 | ||
3622cd47 | 2203 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2204 | if (!enabler_ref) { |
2205 | /* | |
2206 | * If no backward ref, create it. | |
2207 | * Add backward ref from event_notifier to enabler. | |
2208 | */ | |
2209 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2210 | if (!enabler_ref) | |
2211 | return -ENOMEM; | |
2212 | ||
3622cd47 MD |
2213 | enabler_ref->ref = event_enabler; |
2214 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2215 | } |
2216 | ||
3622cd47 MD |
2217 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2218 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2219 | } |
2220 | return 0; | |
2221 | } | |
2222 | ||
3c997079 MD |
2223 | /* |
2224 | * Called at module load: connect the probe on all enablers matching | |
2225 | * this event. | |
2226 | * Called with sessions lock held. | |
2227 | */ | |
2228 | int lttng_fix_pending_events(void) | |
2229 | { | |
8cdc1a81 | 2230 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2231 | |
8cdc1a81 MD |
2232 | list_for_each_entry(session_priv, &sessions, list) |
2233 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2234 | return 0; |
2235 | } | |
2236 | ||
b01155ba FD |
2237 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2238 | struct lttng_event_notifier_group *event_notifier_group) | |
2239 | { | |
09710b83 | 2240 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2241 | |
09710b83 MD |
2242 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2243 | if (event_enabler->enabled) | |
b01155ba FD |
2244 | return true; |
2245 | } | |
2246 | return false; | |
2247 | } | |
2248 | ||
2249 | bool lttng_event_notifier_active(void) | |
2250 | { | |
2251 | struct lttng_event_notifier_group *event_notifier_group; | |
2252 | ||
2253 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2254 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2255 | return true; | |
2256 | } | |
2257 | return false; | |
2258 | } | |
2259 | ||
2260 | int lttng_fix_pending_event_notifiers(void) | |
2261 | { | |
2262 | struct lttng_event_notifier_group *event_notifier_group; | |
2263 | ||
2264 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2265 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2266 | return 0; | |
2267 | } | |
2268 | ||
1ae083ba | 2269 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2270 | enum lttng_enabler_format_type format_type, |
606828e4 | 2271 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2272 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2273 | { |
1ae083ba | 2274 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2275 | |
b2bc0bc8 FD |
2276 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2277 | if (!event_enabler) | |
3c997079 | 2278 | return NULL; |
0bb716a8 | 2279 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2280 | event_enabler->parent.format_type = format_type; |
2281 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2282 | memcpy(&event_enabler->parent.event_param, event_param, | |
2283 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2284 | event_enabler->chan = chan; |
3c997079 | 2285 | /* ctx left NULL */ |
5b9817ae | 2286 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2287 | return event_enabler; |
2288 | } | |
2289 | ||
2290 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2291 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2292 | { |
3c997079 | 2293 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2294 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2295 | event_enabler->parent.published = true; | |
def1e304 | 2296 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2297 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2298 | } |
2299 | ||
7b25ab0e | 2300 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2301 | { |
2302 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2303 | event_enabler->enabled = 1; |
2304 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2305 | mutex_unlock(&sessions_mutex); |
2306 | return 0; | |
2307 | } | |
2308 | ||
7b25ab0e | 2309 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2310 | { |
2311 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2312 | event_enabler->enabled = 0; |
2313 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2314 | mutex_unlock(&sessions_mutex); |
2315 | return 0; | |
2316 | } | |
2317 | ||
b2bc0bc8 | 2318 | static |
8d554755 | 2319 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2320 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2321 | { |
d64ca521 | 2322 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2323 | uint32_t bytecode_len; |
2324 | int ret; | |
2325 | ||
2326 | ret = get_user(bytecode_len, &bytecode->len); | |
2327 | if (ret) | |
2328 | return ret; | |
52cfcdf3 | 2329 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2330 | GFP_KERNEL); |
2331 | if (!bytecode_node) | |
2332 | return -ENOMEM; | |
2333 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2334 | sizeof(*bytecode) + bytecode_len); | |
2335 | if (ret) | |
2336 | goto error_free; | |
b2bc0bc8 | 2337 | |
8a445457 | 2338 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2339 | bytecode_node->enabler = enabler; |
2340 | /* Enforce length based on allocated size */ | |
2341 | bytecode_node->bc.len = bytecode_len; | |
2342 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2343 | |
07dfc1d0 MD |
2344 | return 0; |
2345 | ||
2346 | error_free: | |
52cfcdf3 | 2347 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2348 | return ret; |
2349 | } | |
2350 | ||
6048044f | 2351 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2352 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2353 | { |
2354 | int ret; | |
6048044f | 2355 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2356 | if (ret) |
2357 | goto error; | |
7b25ab0e | 2358 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2359 | return 0; |
2360 | ||
2361 | error: | |
2362 | return ret; | |
2363 | } | |
2364 | ||
e2d5dbc7 | 2365 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2366 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2367 | { |
2368 | ||
e2d5dbc7 | 2369 | switch (event->priv->instrumentation) { |
606828e4 | 2370 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2371 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2372 | default: |
2373 | return -EINVAL; | |
2374 | } | |
2375 | } | |
2376 | ||
3c997079 | 2377 | static |
8d554755 | 2378 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2379 | { |
d64ca521 | 2380 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2381 | |
2382 | /* Destroy filter bytecode */ | |
2383 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2384 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2385 | lttng_kvfree(filter_node); |
07dfc1d0 | 2386 | } |
b2bc0bc8 FD |
2387 | } |
2388 | ||
44b1abdc | 2389 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2390 | { |
09710b83 MD |
2391 | lttng_enabler_destroy(event_enabler); |
2392 | if (event_enabler->published) | |
2393 | list_del(&event_enabler->node); | |
2394 | ||
44b1abdc MD |
2395 | switch (event_enabler->enabler_type) { |
2396 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2397 | { | |
2398 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2399 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2400 | ||
44b1abdc MD |
2401 | kfree(event_recorder_enabler); |
2402 | break; | |
2403 | } | |
2404 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2405 | { | |
2406 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2407 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2408 | |
44b1abdc MD |
2409 | kfree(event_notifier_enabler); |
2410 | break; | |
2411 | } | |
2412 | default: | |
2413 | WARN_ON_ONCE(1); | |
2414 | } | |
3c997079 MD |
2415 | } |
2416 | ||
dffef45d | 2417 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2418 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2419 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2420 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2421 | { |
2422 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2423 | ||
2424 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2425 | if (!event_notifier_enabler) | |
2426 | return NULL; | |
2427 | ||
0bb716a8 | 2428 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2429 | event_notifier_enabler->parent.format_type = format_type; |
2430 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2431 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2432 | ||
99f52fcc | 2433 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2434 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2435 | |
5b9817ae MD |
2436 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2437 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2438 | |
5b9817ae MD |
2439 | event_notifier_enabler->parent.enabled = 0; |
2440 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2441 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2442 | return event_notifier_enabler; |
2443 | } | |
dffef45d | 2444 | |
1bbb5b2d MD |
2445 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2446 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2447 | { | |
dffef45d | 2448 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2449 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2450 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2451 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2452 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2453 | } |
2454 | ||
2455 | int lttng_event_notifier_enabler_enable( | |
2456 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2457 | { | |
2458 | mutex_lock(&sessions_mutex); | |
2459 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2460 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2461 | mutex_unlock(&sessions_mutex); |
2462 | return 0; | |
2463 | } | |
2464 | ||
2465 | int lttng_event_notifier_enabler_disable( | |
2466 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2467 | { | |
2468 | mutex_lock(&sessions_mutex); | |
2469 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2470 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2471 | mutex_unlock(&sessions_mutex); |
2472 | return 0; | |
2473 | } | |
2474 | ||
99d223ad FD |
2475 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2476 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2477 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2478 | { |
d64ca521 | 2479 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2480 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2481 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2482 | uint32_t bytecode_len; | |
2483 | int ret; | |
2484 | ||
2485 | ret = get_user(bytecode_len, &bytecode->len); | |
2486 | if (ret) | |
2487 | return ret; | |
2488 | ||
2489 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2490 | GFP_KERNEL); | |
2491 | if (!bytecode_node) | |
2492 | return -ENOMEM; | |
2493 | ||
2494 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2495 | sizeof(*bytecode) + bytecode_len); | |
2496 | if (ret) | |
2497 | goto error_free; | |
2498 | ||
8a445457 | 2499 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2500 | bytecode_node->enabler = enabler; |
2501 | ||
2502 | /* Enforce length based on allocated size */ | |
2503 | bytecode_node->bc.len = bytecode_len; | |
2504 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2505 | ||
2506 | event_notifier_enabler->num_captures++; | |
2507 | ||
2508 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2509 | goto end; | |
2510 | ||
2511 | error_free: | |
2512 | lttng_kvfree(bytecode_node); | |
2513 | end: | |
2514 | return ret; | |
2515 | } | |
2516 | ||
cc5719b1 MD |
2517 | static |
2518 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2519 | { | |
2520 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2521 | struct lttng_kernel_bytecode_runtime *runtime; | |
2522 | struct lttng_enabler_ref *enabler_ref; | |
2523 | ||
2524 | /* Check if has enablers without bytecode enabled */ | |
2525 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2526 | if (enabler_ref->ref->enabled | |
2527 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2528 | has_enablers_without_filter_bytecode = 1; | |
2529 | break; | |
2530 | } | |
2531 | } | |
2532 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2533 | ||
2534 | /* Enable filters */ | |
2535 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2536 | lttng_bytecode_sync_state(runtime); | |
2537 | nr_filters++; | |
2538 | } | |
2539 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2540 | } | |
2541 | ||
2542 | static | |
2543 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2544 | { | |
2545 | switch (event->type) { | |
2546 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2547 | break; | |
2548 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2549 | { | |
2550 | struct lttng_kernel_event_notifier *event_notifier = | |
2551 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2552 | struct lttng_kernel_bytecode_runtime *runtime; | |
2553 | int nr_captures = 0; | |
2554 | ||
2555 | /* Enable captures */ | |
2556 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2557 | lttng_bytecode_sync_state(runtime); | |
2558 | nr_captures++; | |
2559 | } | |
2560 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2561 | break; | |
2562 | } | |
2563 | default: | |
2564 | WARN_ON_ONCE(1); | |
2565 | } | |
2566 | } | |
2567 | ||
a0c6ad2e MD |
2568 | static |
2569 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2570 | { | |
2571 | struct lttng_enabler_ref *enabler_ref; | |
2572 | bool enabled = false; | |
2573 | ||
2574 | switch (event->priv->instrumentation) { | |
2575 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2576 | lttng_fallthrough; | |
2577 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2578 | /* Enable events */ | |
2579 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2580 | if (enabler_ref->ref->enabled) { | |
2581 | enabled = true; | |
2582 | break; | |
2583 | } | |
2584 | } | |
2585 | break; | |
2586 | default: | |
2587 | WARN_ON_ONCE(1); | |
2588 | return false; | |
2589 | } | |
2590 | ||
2591 | switch (event->type) { | |
2592 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2593 | { | |
2594 | struct lttng_kernel_event_recorder *event_recorder = | |
2595 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2596 | ||
2597 | /* | |
2598 | * Enabled state is based on union of enablers, with | |
2599 | * intersection of session and channel transient enable | |
2600 | * states. | |
2601 | */ | |
2602 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2603 | } | |
2604 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2605 | return enabled; | |
2606 | default: | |
2607 | WARN_ON_ONCE(1); | |
2608 | return false; | |
2609 | } | |
2610 | } | |
2611 | ||
2612 | static | |
2613 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2614 | { | |
2615 | switch (event->priv->instrumentation) { | |
2616 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2617 | lttng_fallthrough; | |
2618 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2619 | return true; | |
2620 | ||
2621 | default: | |
2622 | /* Not handled with lazy sync. */ | |
2623 | return false; | |
2624 | } | |
2625 | } | |
2626 | ||
3c997079 | 2627 | /* |
3c997079 MD |
2628 | * Should be called with sessions mutex held. |
2629 | */ | |
2630 | static | |
a0c6ad2e MD |
2631 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2632 | struct list_head *event_list) | |
3c997079 | 2633 | { |
a0c6ad2e | 2634 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2635 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2636 | |
a0c6ad2e | 2637 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2638 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2639 | |
3c997079 MD |
2640 | /* |
2641 | * For each event, if at least one of its enablers is enabled, | |
2642 | * and its channel and session transient states are enabled, we | |
2643 | * enable the event, else we disable it. | |
2644 | */ | |
a0c6ad2e MD |
2645 | list_for_each_entry(event_priv, event_list, node) { |
2646 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2647 | bool enabled; | |
b4a75708 | 2648 | |
a0c6ad2e | 2649 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2650 | continue; |
3c997079 | 2651 | |
a0c6ad2e MD |
2652 | enabled = lttng_get_event_enabled_state(event); |
2653 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2654 | /* |
a0c6ad2e | 2655 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2656 | */ |
2657 | if (enabled) { | |
6a338ba4 MD |
2658 | if (!event_priv->registered) |
2659 | register_event(event); | |
3c997079 | 2660 | } else { |
6a338ba4 MD |
2661 | if (event_priv->registered) |
2662 | unregister_event(event); | |
3c997079 | 2663 | } |
07dfc1d0 | 2664 | |
a0c6ad2e MD |
2665 | lttng_event_sync_filter_state(event); |
2666 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2667 | } |
2668 | } | |
2669 | ||
a0c6ad2e MD |
2670 | /* |
2671 | * lttng_session_sync_event_enablers should be called just before starting a | |
2672 | * session. | |
2673 | */ | |
2674 | static | |
2675 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2676 | { | |
2677 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2678 | } | |
2679 | ||
3c997079 MD |
2680 | /* |
2681 | * Apply enablers to session events, adding events to session if need | |
2682 | * be. It is required after each modification applied to an active | |
2683 | * session, and right before session "start". | |
2684 | * "lazy" sync means we only sync if required. | |
2685 | * Should be called with sessions mutex held. | |
2686 | */ | |
2687 | static | |
8cdc1a81 | 2688 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2689 | { |
2690 | /* We can skip if session is not active */ | |
2691 | if (!session->active) | |
2692 | return; | |
b2bc0bc8 | 2693 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2694 | } |
2695 | ||
b01155ba FD |
2696 | static |
2697 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2698 | { | |
a0c6ad2e | 2699 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2700 | } |
2701 | ||
7b25ab0e MD |
2702 | static |
2703 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2704 | { | |
2705 | switch (event_enabler->enabler_type) { | |
2706 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2707 | { | |
2708 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2709 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2710 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2711 | break; | |
2712 | } | |
2713 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2714 | { | |
2715 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2716 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2717 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2718 | break; | |
2719 | } | |
2720 | default: | |
2721 | WARN_ON_ONCE(1); | |
2722 | } | |
2723 | } | |
2724 | ||
1ec3f75a | 2725 | /* |
d83004aa JD |
2726 | * Serialize at most one packet worth of metadata into a metadata |
2727 | * channel. | |
92d9f5e6 MD |
2728 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2729 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2730 | * allows us to do racy operations such as looking for remaining space left in | |
2731 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2732 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2733 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2734 | * Returns the number of bytes written in the channel, 0 if no data |
2735 | * was written and a negative value on error. | |
1ec3f75a | 2736 | */ |
b3b8072b | 2737 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2738 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2739 | { |
8a57ec02 | 2740 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2741 | int ret = 0; |
2742 | size_t len, reserve_len; | |
2743 | ||
f613e3e6 | 2744 | /* |
92d9f5e6 MD |
2745 | * Ensure we support mutiple get_next / put sequences followed by |
2746 | * put_next. The metadata cache lock protects reading the metadata | |
2747 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2748 | * "flush" operations on the buffer invoked by different processes. | |
2749 | * Moreover, since the metadata cache memory can be reallocated, we | |
2750 | * need to have exclusive access against updates even though we only | |
2751 | * read it. | |
f613e3e6 | 2752 | */ |
92d9f5e6 | 2753 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2754 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2755 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2756 | goto end; |
f613e3e6 | 2757 | |
9616f0bf JD |
2758 | /* Metadata regenerated, change the version. */ |
2759 | if (stream->metadata_cache->version != stream->version) | |
2760 | stream->version = stream->metadata_cache->version; | |
2761 | ||
d83004aa | 2762 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2763 | stream->metadata_in; |
9de2c215 | 2764 | if (!len) |
de23d59d | 2765 | goto end; |
d83004aa | 2766 | reserve_len = min_t(size_t, |
4a399b76 | 2767 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2768 | len); |
a775608d | 2769 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2770 | sizeof(char), NULL); |
d83004aa JD |
2771 | /* |
2772 | * If reservation failed, return an error to the caller. | |
2773 | */ | |
c2fb9c1c | 2774 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2775 | if (ret != 0) { |
2776 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2777 | stream->coherent = false; |
d83004aa JD |
2778 | goto end; |
2779 | } | |
b3b8072b | 2780 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2781 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2782 | reserve_len, 1); |
b3b8072b | 2783 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2784 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2785 | if (reserve_len < len) |
8b97fd42 MD |
2786 | stream->coherent = false; |
2787 | else | |
2788 | stream->coherent = true; | |
d83004aa JD |
2789 | ret = reserve_len; |
2790 | ||
2791 | end: | |
8b97fd42 MD |
2792 | if (coherent) |
2793 | *coherent = stream->coherent; | |
92d9f5e6 | 2794 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2795 | return ret; |
2796 | } | |
2797 | ||
8b97fd42 | 2798 | static |
8cdc1a81 | 2799 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2800 | { |
8cdc1a81 MD |
2801 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2802 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2803 | } |
2804 | ||
2805 | static | |
8cdc1a81 | 2806 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2807 | { |
8cdc1a81 MD |
2808 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2809 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2810 | struct lttng_metadata_stream *stream; |
2811 | ||
8cdc1a81 | 2812 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2813 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2814 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2815 | } |
8b97fd42 MD |
2816 | } |
2817 | ||
d83004aa JD |
2818 | /* |
2819 | * Write the metadata to the metadata cache. | |
2820 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2821 | * The metadata cache lock protects us from concurrent read access from |
2822 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2823 | * The content of the printf is printed as a single atomic metadata |
2824 | * transaction. | |
d83004aa | 2825 | */ |
8cdc1a81 | 2826 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2827 | const char *fmt, ...) |
2828 | { | |
c099397a | 2829 | char *str; |
d83004aa | 2830 | size_t len; |
c099397a MD |
2831 | va_list ap; |
2832 | ||
585e5dcc | 2833 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2834 | |
2835 | va_start(ap, fmt); | |
2836 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2837 | va_end(ap); | |
2838 | if (!str) | |
2839 | return -ENOMEM; | |
2840 | ||
1ec3f75a | 2841 | len = strlen(str); |
8cdc1a81 MD |
2842 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2843 | if (session->priv->metadata_cache->metadata_written + len > | |
2844 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2845 | char *tmp_cache_realloc; |
2846 | unsigned int tmp_cache_alloc_size; | |
2847 | ||
2848 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2849 | session->priv->metadata_cache->cache_alloc + len, |
2850 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2851 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2852 | if (!tmp_cache_realloc) |
2853 | goto err; | |
8cdc1a81 | 2854 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2855 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2856 | session->priv->metadata_cache->data, |
2857 | session->priv->metadata_cache->cache_alloc); | |
2858 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2859 | } |
2860 | ||
8cdc1a81 MD |
2861 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2862 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2863 | } |
8cdc1a81 MD |
2864 | memcpy(session->priv->metadata_cache->data + |
2865 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2866 | str, len); |
8cdc1a81 | 2867 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2868 | kfree(str); |
d83004aa | 2869 | |
d83004aa JD |
2870 | return 0; |
2871 | ||
2872 | err: | |
2873 | kfree(str); | |
2874 | return -ENOMEM; | |
c099397a MD |
2875 | } |
2876 | ||
f513b2bf | 2877 | static |
8cdc1a81 | 2878 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2879 | { |
2880 | size_t i; | |
2881 | ||
2882 | for (i = 0; i < nesting; i++) { | |
2883 | int ret; | |
2884 | ||
2885 | ret = lttng_metadata_printf(session, " "); | |
2886 | if (ret) { | |
2887 | return ret; | |
2888 | } | |
2889 | } | |
2890 | return 0; | |
2891 | } | |
2892 | ||
ceabb767 | 2893 | static |
8cdc1a81 | 2894 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2895 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2896 | size_t nesting) |
2897 | { | |
2898 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2899 | } | |
2900 | ||
2901 | static | |
8cdc1a81 | 2902 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2903 | const struct lttng_kernel_type_integer *type, |
2904 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2905 | size_t nesting) |
2906 | { | |
2907 | int ret; | |
2908 | ||
ceabb767 MD |
2909 | ret = print_tabs(session, nesting); |
2910 | if (ret) | |
2911 | return ret; | |
2912 | ret = lttng_metadata_printf(session, | |
2913 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2914 | type->size, |
2915 | type->alignment, | |
2916 | type->signedness, | |
2917 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2918 | ? "none" |
437d5aa5 | 2919 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2920 | ? "UTF8" |
2921 | : "ASCII", | |
437d5aa5 | 2922 | type->base, |
ceabb767 | 2923 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2924 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2925 | #else |
437d5aa5 | 2926 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2927 | #endif |
2928 | ); | |
2929 | return ret; | |
2930 | } | |
2931 | ||
f513b2bf MD |
2932 | /* |
2933 | * Must be called with sessions_mutex held. | |
2934 | */ | |
2935 | static | |
8cdc1a81 | 2936 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2937 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2938 | size_t nesting) |
2939 | { | |
51ef4536 | 2940 | const char *prev_field_name = NULL; |
f513b2bf MD |
2941 | int ret; |
2942 | uint32_t i, nr_fields; | |
ceabb767 MD |
2943 | unsigned int alignment; |
2944 | ||
f513b2bf MD |
2945 | ret = print_tabs(session, nesting); |
2946 | if (ret) | |
2947 | return ret; | |
2948 | ret = lttng_metadata_printf(session, | |
2949 | "struct {\n"); | |
2950 | if (ret) | |
2951 | return ret; | |
437d5aa5 | 2952 | nr_fields = type->nr_fields; |
f513b2bf | 2953 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2954 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2955 | |
437d5aa5 | 2956 | iter_field = type->fields[i]; |
51ef4536 | 2957 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2958 | if (ret) |
2959 | return ret; | |
2960 | } | |
2961 | ret = print_tabs(session, nesting); | |
2962 | if (ret) | |
2963 | return ret; | |
437d5aa5 | 2964 | alignment = type->alignment; |
ceabb767 MD |
2965 | if (alignment) { |
2966 | ret = lttng_metadata_printf(session, | |
2967 | "} align(%u)", | |
2968 | alignment); | |
2969 | } else { | |
2970 | ret = lttng_metadata_printf(session, | |
2971 | "}"); | |
2972 | } | |
f513b2bf MD |
2973 | return ret; |
2974 | } | |
2975 | ||
2976 | /* | |
2977 | * Must be called with sessions_mutex held. | |
2978 | */ | |
2979 | static | |
8cdc1a81 | 2980 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2981 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2982 | size_t nesting) |
2983 | { | |
2984 | int ret; | |
2985 | ||
2986 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2987 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2988 | if (ret) |
2989 | return ret; | |
ceabb767 | 2990 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2991 | } |
2992 | ||
65c85aa6 MD |
2993 | /* |
2994 | * Must be called with sessions_mutex held. | |
2995 | */ | |
2996 | static | |
8cdc1a81 | 2997 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2998 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
2999 | size_t nesting, |
3000 | const char *prev_field_name) | |
65c85aa6 | 3001 | { |
51ef4536 | 3002 | const char *tag_name; |
65c85aa6 MD |
3003 | int ret; |
3004 | uint32_t i, nr_choices; | |
3005 | ||
51ef4536 MD |
3006 | tag_name = type->tag_name; |
3007 | if (!tag_name) | |
3008 | tag_name = prev_field_name; | |
3009 | if (!tag_name) | |
3010 | return -EINVAL; | |
ceabb767 MD |
3011 | /* |
3012 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3013 | */ | |
437d5aa5 | 3014 | if (type->alignment != 0) |
ceabb767 | 3015 | return -EINVAL; |
65c85aa6 MD |
3016 | ret = print_tabs(session, nesting); |
3017 | if (ret) | |
3018 | return ret; | |
3019 | ret = lttng_metadata_printf(session, | |
3020 | "variant <_%s> {\n", | |
51ef4536 | 3021 | tag_name); |
65c85aa6 MD |
3022 | if (ret) |
3023 | return ret; | |
437d5aa5 | 3024 | nr_choices = type->nr_choices; |
65c85aa6 | 3025 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3026 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3027 | |
437d5aa5 | 3028 | iter_field = type->choices[i]; |
51ef4536 | 3029 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3030 | if (ret) |
3031 | return ret; | |
3032 | } | |
3033 | ret = print_tabs(session, nesting); | |
3034 | if (ret) | |
3035 | return ret; | |
3036 | ret = lttng_metadata_printf(session, | |
3037 | "}"); | |
3038 | return ret; | |
3039 | } | |
3040 | ||
3041 | /* | |
3042 | * Must be called with sessions_mutex held. | |
3043 | */ | |
3044 | static | |
8cdc1a81 | 3045 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3046 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3047 | size_t nesting, |
3048 | const char *prev_field_name) | |
65c85aa6 MD |
3049 | { |
3050 | int ret; | |
3051 | ||
3052 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3053 | lttng_kernel_get_type_variant(field->type), nesting, |
3054 | prev_field_name); | |
65c85aa6 MD |
3055 | if (ret) |
3056 | return ret; | |
ceabb767 | 3057 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3058 | } |
3059 | ||
f513b2bf MD |
3060 | /* |
3061 | * Must be called with sessions_mutex held. | |
3062 | */ | |
3063 | static | |
8cdc1a81 | 3064 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3065 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3066 | size_t nesting) |
3067 | { | |
3068 | int ret; | |
437d5aa5 MD |
3069 | const struct lttng_kernel_type_array *array_type; |
3070 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3071 | |
437d5aa5 MD |
3072 | array_type = lttng_kernel_get_type_array(field->type); |
3073 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3074 | |
437d5aa5 | 3075 | if (array_type->alignment) { |
ceabb767 | 3076 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3077 | if (ret) |
3078 | return ret; | |
ceabb767 MD |
3079 | ret = lttng_metadata_printf(session, |
3080 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3081 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3082 | field->name); |
3083 | if (ret) | |
3084 | return ret; | |
3085 | } | |
3086 | /* | |
3087 | * Nested compound types: Only array of structures and variants are | |
3088 | * currently supported. | |
3089 | */ | |
437d5aa5 | 3090 | elem_type = array_type->elem_type; |
12bb2edb MD |
3091 | switch (elem_type->type) { |
3092 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3093 | case lttng_kernel_type_struct: |
3094 | case lttng_kernel_type_variant: | |
3095 | ret = _lttng_type_statedump(session, elem_type, | |
3096 | array_type->encoding, nesting); | |
65c85aa6 MD |
3097 | if (ret) |
3098 | return ret; | |
3099 | break; | |
ceabb767 | 3100 | |
f513b2bf MD |
3101 | default: |
3102 | return -EINVAL; | |
3103 | } | |
3104 | ret = lttng_metadata_printf(session, | |
3105 | " _%s[%u];\n", | |
3106 | field->name, | |
437d5aa5 | 3107 | array_type->length); |
f513b2bf MD |
3108 | return ret; |
3109 | } | |
3110 | ||
3111 | /* | |
3112 | * Must be called with sessions_mutex held. | |
3113 | */ | |
3114 | static | |
8cdc1a81 | 3115 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3116 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3117 | size_t nesting, |
3118 | const char *prev_field_name) | |
f513b2bf MD |
3119 | { |
3120 | int ret; | |
3121 | const char *length_name; | |
437d5aa5 MD |
3122 | const struct lttng_kernel_type_sequence *sequence_type; |
3123 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3124 | |
437d5aa5 MD |
3125 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3126 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3127 | |
437d5aa5 | 3128 | length_name = sequence_type->length_name; |
51ef4536 MD |
3129 | if (!length_name) |
3130 | length_name = prev_field_name; | |
3131 | if (!length_name) | |
3132 | return -EINVAL; | |
ceabb767 | 3133 | |
437d5aa5 | 3134 | if (sequence_type->alignment) { |
ceabb767 | 3135 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3136 | if (ret) |
3137 | return ret; | |
ceabb767 MD |
3138 | ret = lttng_metadata_printf(session, |
3139 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3140 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3141 | field->name); |
3142 | if (ret) | |
3143 | return ret; | |
3144 | } | |
3145 | ||
3146 | /* | |
3147 | * Nested compound types: Only array of structures and variants are | |
3148 | * currently supported. | |
3149 | */ | |
437d5aa5 | 3150 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3151 | switch (elem_type->type) { |
3152 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3153 | case lttng_kernel_type_struct: |
3154 | case lttng_kernel_type_variant: | |
3155 | ret = _lttng_type_statedump(session, elem_type, | |
3156 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3157 | if (ret) |
3158 | return ret; | |
3159 | break; | |
ceabb767 | 3160 | |
f513b2bf MD |
3161 | default: |
3162 | return -EINVAL; | |
3163 | } | |
3164 | ret = lttng_metadata_printf(session, | |
3165 | " _%s[ _%s ];\n", | |
3166 | field->name, | |
51ef4536 | 3167 | length_name); |
f513b2bf MD |
3168 | return ret; |
3169 | } | |
3170 | ||
141ddf28 MD |
3171 | /* |
3172 | * Must be called with sessions_mutex held. | |
3173 | */ | |
3174 | static | |
8cdc1a81 | 3175 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3176 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3177 | size_t nesting) |
3178 | { | |
d96a4a7a | 3179 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3180 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3181 | int ret; |
3182 | unsigned int i, nr_entries; | |
3183 | ||
437d5aa5 | 3184 | container_type = type->container_type; |
12bb2edb | 3185 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3186 | ret = -EINVAL; |
3187 | goto end; | |
3188 | } | |
437d5aa5 | 3189 | enum_desc = type->desc; |
141ddf28 MD |
3190 | nr_entries = enum_desc->nr_entries; |
3191 | ||
3192 | ret = print_tabs(session, nesting); | |
3193 | if (ret) | |
3194 | goto end; | |
ceabb767 MD |
3195 | ret = lttng_metadata_printf(session, "enum : "); |
3196 | if (ret) | |
3197 | goto end; | |
437d5aa5 MD |
3198 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3199 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3200 | if (ret) |
ceabb767 MD |
3201 | goto end; |
3202 | ret = lttng_metadata_printf(session, " {\n"); | |
3203 | if (ret) | |
3204 | goto end; | |
141ddf28 MD |
3205 | /* Dump all entries */ |
3206 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3207 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3208 | int j, len; |
3209 | ||
3210 | ret = print_tabs(session, nesting + 1); | |
3211 | if (ret) | |
3212 | goto end; | |
3213 | ret = lttng_metadata_printf(session, | |
3214 | "\""); | |
3215 | if (ret) | |
3216 | goto end; | |
3217 | len = strlen(entry->string); | |
3218 | /* Escape the character '"' */ | |
3219 | for (j = 0; j < len; j++) { | |
3220 | char c = entry->string[j]; | |
3221 | ||
3222 | switch (c) { | |
3223 | case '"': | |
3224 | ret = lttng_metadata_printf(session, | |
3225 | "\\\""); | |
3226 | break; | |
3227 | case '\\': | |
3228 | ret = lttng_metadata_printf(session, | |
3229 | "\\\\"); | |
3230 | break; | |
3231 | default: | |
3232 | ret = lttng_metadata_printf(session, | |
3233 | "%c", c); | |
3234 | break; | |
3235 | } | |
3236 | if (ret) | |
3237 | goto end; | |
3238 | } | |
08ad1061 PP |
3239 | ret = lttng_metadata_printf(session, "\""); |
3240 | if (ret) | |
3241 | goto end; | |
3242 | ||
3243 | if (entry->options.is_auto) { | |
3244 | ret = lttng_metadata_printf(session, ",\n"); | |
3245 | if (ret) | |
3246 | goto end; | |
141ddf28 | 3247 | } else { |
7c559490 MD |
3248 | ret = lttng_metadata_printf(session, |
3249 | " = "); | |
3250 | if (ret) | |
3251 | goto end; | |
3252 | if (entry->start.signedness) | |
141ddf28 | 3253 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3254 | "%lld", (long long) entry->start.value); |
3255 | else | |
3256 | ret = lttng_metadata_printf(session, | |
3257 | "%llu", entry->start.value); | |
3258 | if (ret) | |
3259 | goto end; | |
3260 | if (entry->start.signedness == entry->end.signedness && | |
3261 | entry->start.value | |
3262 | == entry->end.value) { | |
141ddf28 | 3263 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3264 | ",\n"); |
3265 | } else { | |
3266 | if (entry->end.signedness) { | |
3267 | ret = lttng_metadata_printf(session, | |
3268 | " ... %lld,\n", | |
3269 | (long long) entry->end.value); | |
3270 | } else { | |
3271 | ret = lttng_metadata_printf(session, | |
3272 | " ... %llu,\n", | |
3273 | entry->end.value); | |
3274 | } | |
141ddf28 | 3275 | } |
7c559490 MD |
3276 | if (ret) |
3277 | goto end; | |
141ddf28 | 3278 | } |
141ddf28 MD |
3279 | } |
3280 | ret = print_tabs(session, nesting); | |
3281 | if (ret) | |
3282 | goto end; | |
ceabb767 | 3283 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3284 | end: |
3285 | return ret; | |
3286 | } | |
3287 | ||
d83004aa JD |
3288 | /* |
3289 | * Must be called with sessions_mutex held. | |
3290 | */ | |
c099397a | 3291 | static |
8cdc1a81 | 3292 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3293 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3294 | size_t nesting) |
3295 | { | |
3296 | int ret; | |
437d5aa5 | 3297 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3298 | |
437d5aa5 MD |
3299 | enum_type = lttng_kernel_get_type_enum(field->type); |
3300 | WARN_ON_ONCE(!enum_type); | |
3301 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3302 | if (ret) |
3303 | return ret; | |
3304 | return lttng_field_name_statedump(session, field, nesting); | |
3305 | } | |
3306 | ||
3307 | static | |
8cdc1a81 | 3308 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3309 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3310 | size_t nesting) |
3311 | { | |
3312 | int ret; | |
3313 | ||
437d5aa5 MD |
3314 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3315 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3316 | if (ret) |
3317 | return ret; | |
3318 | return lttng_field_name_statedump(session, field, nesting); | |
3319 | } | |
3320 | ||
3321 | static | |
8cdc1a81 | 3322 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3323 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3324 | size_t nesting) |
3325 | { | |
3326 | int ret; | |
3327 | ||
ceabb767 MD |
3328 | /* Default encoding is UTF8 */ |
3329 | ret = print_tabs(session, nesting); | |
3330 | if (ret) | |
3331 | return ret; | |
3332 | ret = lttng_metadata_printf(session, | |
3333 | "string%s", | |
437d5aa5 | 3334 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3335 | " { encoding = ASCII; }" : ""); |
3336 | return ret; | |
3337 | } | |
3338 | ||
3339 | static | |
8cdc1a81 | 3340 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3341 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3342 | size_t nesting) |
ceabb767 | 3343 | { |
437d5aa5 | 3344 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3345 | int ret; |
3346 | ||
437d5aa5 MD |
3347 | string_type = lttng_kernel_get_type_string(field->type); |
3348 | WARN_ON_ONCE(!string_type); | |
3349 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3350 | if (ret) |
3351 | return ret; | |
3352 | return lttng_field_name_statedump(session, field, nesting); | |
3353 | } | |
3354 | ||
3355 | /* | |
3356 | * Must be called with sessions_mutex held. | |
3357 | */ | |
3358 | static | |
8cdc1a81 | 3359 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3360 | const struct lttng_kernel_type_common *type, |
3361 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3362 | size_t nesting) |
c099397a | 3363 | { |
c099397a | 3364 | int ret = 0; |
c099397a | 3365 | |
12bb2edb MD |
3366 | switch (type->type) { |
3367 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3368 | ret = _lttng_integer_type_statedump(session, |
3369 | lttng_kernel_get_type_integer(type), | |
3370 | parent_encoding, nesting); | |
8070f5c0 | 3371 | break; |
437d5aa5 MD |
3372 | case lttng_kernel_type_enum: |
3373 | ret = _lttng_enum_type_statedump(session, | |
3374 | lttng_kernel_get_type_enum(type), | |
3375 | nesting); | |
8070f5c0 | 3376 | break; |
12bb2edb | 3377 | case lttng_kernel_type_string: |
437d5aa5 MD |
3378 | ret = _lttng_string_type_statedump(session, |
3379 | lttng_kernel_get_type_string(type), | |
3380 | nesting); | |
ceabb767 | 3381 | break; |
437d5aa5 MD |
3382 | case lttng_kernel_type_struct: |
3383 | ret = _lttng_struct_type_statedump(session, | |
3384 | lttng_kernel_get_type_struct(type), | |
3385 | nesting); | |
8070f5c0 | 3386 | break; |
437d5aa5 MD |
3387 | case lttng_kernel_type_variant: |
3388 | ret = _lttng_variant_type_statedump(session, | |
3389 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3390 | nesting, NULL); |
ceabb767 MD |
3391 | break; |
3392 | ||
3393 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3394 | case lttng_kernel_type_array: |
3395 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3396 | default: |
3397 | WARN_ON_ONCE(1); | |
3398 | return -EINVAL; | |
8070f5c0 | 3399 | } |
ceabb767 MD |
3400 | return ret; |
3401 | } | |
8070f5c0 | 3402 | |
ceabb767 MD |
3403 | /* |
3404 | * Must be called with sessions_mutex held. | |
3405 | */ | |
3406 | static | |
8cdc1a81 | 3407 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3408 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3409 | size_t nesting, |
3410 | const char **prev_field_name_p) | |
ceabb767 | 3411 | { |
51ef4536 | 3412 | const char *prev_field_name = NULL; |
ceabb767 | 3413 | int ret = 0; |
27d2368e | 3414 | |
51ef4536 MD |
3415 | if (prev_field_name_p) |
3416 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3417 | switch (field->type->type) { |
12bb2edb | 3418 | case lttng_kernel_type_integer: |
ceabb767 MD |
3419 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3420 | break; | |
437d5aa5 | 3421 | case lttng_kernel_type_enum: |
ceabb767 | 3422 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3423 | break; |
12bb2edb | 3424 | case lttng_kernel_type_string: |
ceabb767 | 3425 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3426 | break; |
437d5aa5 | 3427 | case lttng_kernel_type_struct: |
ceabb767 | 3428 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3429 | break; |
437d5aa5 | 3430 | case lttng_kernel_type_array: |
ceabb767 | 3431 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3432 | break; |
437d5aa5 | 3433 | case lttng_kernel_type_sequence: |
51ef4536 | 3434 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3435 | break; |
437d5aa5 | 3436 | case lttng_kernel_type_variant: |
51ef4536 | 3437 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3438 | break; |
f513b2bf | 3439 | |
8070f5c0 MD |
3440 | default: |
3441 | WARN_ON_ONCE(1); | |
3442 | return -EINVAL; | |
3443 | } | |
51ef4536 MD |
3444 | if (prev_field_name_p) |
3445 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3446 | return ret; |
3447 | } | |
3448 | ||
3449 | static | |
8cdc1a81 | 3450 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3451 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3452 | { |
51ef4536 | 3453 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3454 | int ret = 0; |
3455 | int i; | |
3456 | ||
3457 | if (!ctx) | |
3458 | return 0; | |
3459 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3460 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3461 | |
51ef4536 | 3462 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3463 | if (ret) |
3464 | return ret; | |
3465 | } | |
3466 | return ret; | |
3467 | } | |
3468 | ||
3469 | static | |
8cdc1a81 | 3470 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3471 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3472 | { |
51ef4536 | 3473 | const char *prev_field_name = NULL; |
a67ba386 | 3474 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3475 | int ret = 0; |
3476 | int i; | |
3477 | ||
6c8c025b MD |
3478 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3479 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3480 | |
51ef4536 | 3481 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3482 | if (ret) |
3483 | return ret; | |
c099397a MD |
3484 | } |
3485 | return ret; | |
3486 | } | |
3487 | ||
d83004aa JD |
3488 | /* |
3489 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3490 | * The entire event metadata is printed as a single atomic metadata |
3491 | * transaction. | |
d83004aa | 3492 | */ |
c099397a | 3493 | static |
ee7e9a18 | 3494 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3495 | { |
ee7e9a18 MD |
3496 | struct lttng_kernel_event_recorder *event_recorder; |
3497 | struct lttng_kernel_channel_buffer *chan; | |
3498 | struct lttng_kernel_session *session; | |
c099397a MD |
3499 | int ret = 0; |
3500 | ||
ee7e9a18 MD |
3501 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3502 | return 0; | |
3503 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3504 | chan = event_recorder->chan; | |
3505 | session = chan->parent.session; | |
3506 | ||
a67ba386 | 3507 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3508 | return 0; |
f7d06400 | 3509 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3510 | return 0; |
3511 | ||
8b97fd42 MD |
3512 | lttng_metadata_begin(session); |
3513 | ||
c099397a MD |
3514 | ret = lttng_metadata_printf(session, |
3515 | "event {\n" | |
ae734547 | 3516 | " name = \"%s\";\n" |
c099397a | 3517 | " id = %u;\n" |
b9074a1b | 3518 | " stream_id = %u;\n", |
a67ba386 MD |
3519 | event_recorder->priv->parent.desc->event_name, |
3520 | event_recorder->priv->id, | |
f7d06400 | 3521 | event_recorder->chan->priv->id); |
c099397a MD |
3522 | if (ret) |
3523 | goto end; | |
3524 | ||
8070f5c0 | 3525 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3526 | " fields := struct {\n" |
3527 | ); | |
3528 | if (ret) | |
3529 | goto end; | |
3530 | ||
a67ba386 | 3531 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3532 | if (ret) |
3533 | goto end; | |
3534 | ||
3535 | /* | |
3536 | * LTTng space reservation can only reserve multiples of the | |
3537 | * byte size. | |
3538 | */ | |
3539 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3540 | " };\n" |
3541 | "};\n\n"); | |
c099397a MD |
3542 | if (ret) |
3543 | goto end; | |
3544 | ||
a67ba386 | 3545 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3546 | end: |
8b97fd42 | 3547 | lttng_metadata_end(session); |
c099397a MD |
3548 | return ret; |
3549 | ||
3550 | } | |
3551 | ||
d83004aa JD |
3552 | /* |
3553 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3554 | * The entire channel metadata is printed as a single atomic metadata |
3555 | * transaction. | |
d83004aa | 3556 | */ |
c099397a | 3557 | static |
8cdc1a81 | 3558 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3559 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3560 | { |
3561 | int ret = 0; | |
3562 | ||
f7d06400 | 3563 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3564 | return 0; |
d83004aa | 3565 | |
f7d06400 | 3566 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3567 | return 0; |
3568 | ||
8b97fd42 MD |
3569 | lttng_metadata_begin(session); |
3570 | ||
f7d06400 | 3571 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3572 | ret = lttng_metadata_printf(session, |
3573 | "stream {\n" | |
3574 | " id = %u;\n" | |
9115fbdc | 3575 | " event.header := %s;\n" |
b9074a1b | 3576 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3577 | chan->priv->id, |
3578 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3579 | "struct event_header_large"); |
3580 | if (ret) | |
3581 | goto end; | |
3582 | ||
f7d06400 | 3583 | if (chan->priv->ctx) { |
b9074a1b MD |
3584 | ret = lttng_metadata_printf(session, |
3585 | " event.context := struct {\n"); | |
3586 | if (ret) | |
3587 | goto end; | |
3588 | } | |
f7d06400 | 3589 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3590 | if (ret) |
3591 | goto end; | |
f7d06400 | 3592 | if (chan->priv->ctx) { |
b9074a1b MD |
3593 | ret = lttng_metadata_printf(session, |
3594 | " };\n"); | |
3595 | if (ret) | |
3596 | goto end; | |
3597 | } | |
8070f5c0 MD |
3598 | |
3599 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3600 | "};\n\n"); |
8070f5c0 | 3601 | |
f7d06400 | 3602 | chan->priv->metadata_dumped = 1; |
c099397a | 3603 | end: |
8b97fd42 | 3604 | lttng_metadata_end(session); |
c099397a MD |
3605 | return ret; |
3606 | } | |
3607 | ||
d83004aa JD |
3608 | /* |
3609 | * Must be called with sessions_mutex held. | |
3610 | */ | |
9115fbdc | 3611 | static |
8cdc1a81 | 3612 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3613 | { |
3614 | return lttng_metadata_printf(session, | |
3615 | "struct packet_context {\n" | |
a3ccff4f MD |
3616 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3617 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3618 | " uint64_t content_size;\n" |
3619 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3620 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3621 | " unsigned long events_discarded;\n" |
9115fbdc | 3622 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3623 | "};\n\n" |
9115fbdc MD |
3624 | ); |
3625 | } | |
3626 | ||
3627 | /* | |
3628 | * Compact header: | |
3629 | * id: range: 0 - 30. | |
3630 | * id 31 is reserved to indicate an extended header. | |
3631 | * | |
3632 | * Large header: | |
3633 | * id: range: 0 - 65534. | |
3634 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3635 | * |
3636 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3637 | */ |
3638 | static | |
8cdc1a81 | 3639 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3640 | { |
3641 | return lttng_metadata_printf(session, | |
3642 | "struct event_header_compact {\n" | |
3643 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3644 | " variant <id> {\n" | |
3645 | " struct {\n" | |
a3ccff4f | 3646 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3647 | " } compact;\n" |
3648 | " struct {\n" | |
3649 | " uint32_t id;\n" | |
a3ccff4f | 3650 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3651 | " } extended;\n" |
3652 | " } v;\n" | |
3653 | "} align(%u);\n" | |
3654 | "\n" | |
3655 | "struct event_header_large {\n" | |
3656 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3657 | " variant <id> {\n" | |
3658 | " struct {\n" | |
a3ccff4f | 3659 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3660 | " } compact;\n" |
3661 | " struct {\n" | |
3662 | " uint32_t id;\n" | |
a3ccff4f | 3663 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3664 | " } extended;\n" |
3665 | " } v;\n" | |
3666 | "} align(%u);\n\n", | |
a90917c3 MD |
3667 | lttng_alignof(uint32_t) * CHAR_BIT, |
3668 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3669 | ); |
3670 | } | |
3671 | ||
a3ccff4f MD |
3672 | /* |
3673 | * Approximation of NTP time of day to clock monotonic correlation, | |
3674 | * taken at start of trace. | |
3675 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3676 | * in future versions. | |
5283350b MD |
3677 | * This function may return a negative offset. It may happen if the |
3678 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3679 | * |
3680 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3681 | * y2038 compliant. | |
a3ccff4f MD |
3682 | */ |
3683 | static | |
8967b2a3 | 3684 | int64_t measure_clock_offset(void) |
a3ccff4f | 3685 | { |
dcb93448 | 3686 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3687 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3688 | int64_t offset; |
a3ccff4f | 3689 | unsigned long flags; |
3636085f MJ |
3690 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3691 | struct timespec64 rts = { 0, 0 }; | |
3692 | #else | |
3693 | struct timespec rts = { 0, 0 }; | |
3694 | #endif | |
a3ccff4f MD |
3695 | |
3696 | /* Disable interrupts to increase correlation precision. */ | |
3697 | local_irq_save(flags); | |
3698 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3699 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3700 | ktime_get_real_ts64(&rts); | |
3701 | #else | |
216b6baa | 3702 | getnstimeofday(&rts); |
3636085f | 3703 | #endif |
a3ccff4f MD |
3704 | monotonic[1] = trace_clock_read64(); |
3705 | local_irq_restore(flags); | |
3706 | ||
dcb93448 | 3707 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3708 | realtime = (uint64_t) rts.tv_sec * tcf; |
3709 | if (tcf == NSEC_PER_SEC) { | |
3710 | realtime += rts.tv_nsec; | |
3711 | } else { | |
3712 | uint64_t n = rts.tv_nsec * tcf; | |
3713 | ||
3714 | do_div(n, NSEC_PER_SEC); | |
3715 | realtime += n; | |
3716 | } | |
dcb93448 | 3717 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3718 | return offset; |
3719 | } | |
3720 | ||
3eb95be4 | 3721 | static |
8cdc1a81 | 3722 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3723 | { |
0f3eaad4 | 3724 | int ret = 0; |
3eb95be4 JR |
3725 | size_t i; |
3726 | char cur; | |
3727 | ||
3728 | i = 0; | |
3729 | cur = string[i]; | |
3730 | while (cur != '\0') { | |
3731 | switch (cur) { | |
3732 | case '\n': | |
3733 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3734 | break; | |
3735 | case '\\': | |
3736 | case '"': | |
3737 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3738 | if (ret) | |
3739 | goto error; | |
3740 | /* We still print the current char */ | |
c190d76e | 3741 | lttng_fallthrough; |
3eb95be4 JR |
3742 | default: |
3743 | ret = lttng_metadata_printf(session, "%c", cur); | |
3744 | break; | |
3745 | } | |
3746 | ||
3747 | if (ret) | |
3748 | goto error; | |
3749 | ||
3750 | cur = string[++i]; | |
3751 | } | |
3752 | error: | |
3753 | return ret; | |
3754 | } | |
3755 | ||
3756 | static | |
8cdc1a81 | 3757 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3758 | const char *field_value) |
3eb95be4 JR |
3759 | { |
3760 | int ret; | |
3761 | ||
1c88f269 | 3762 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3763 | if (ret) |
3764 | goto error; | |
3765 | ||
1c88f269 | 3766 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3767 | if (ret) |
3768 | goto error; | |
3769 | ||
3770 | ret = lttng_metadata_printf(session, "\";\n"); | |
3771 | ||
3772 | error: | |
3773 | return ret; | |
3774 | } | |
3775 | ||
c099397a MD |
3776 | /* |
3777 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3778 | * Must be called with sessions_mutex held. |
c099397a MD |
3779 | */ |
3780 | static | |
8cdc1a81 | 3781 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3782 | { |
8cdc1a81 | 3783 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3784 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3785 | const char *product_uuid; |
f7d06400 | 3786 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3787 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3788 | int ret = 0; |
3789 | ||
585e5dcc | 3790 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3791 | return 0; |
8b97fd42 MD |
3792 | |
3793 | lttng_metadata_begin(session); | |
3794 | ||
8cdc1a81 | 3795 | if (session->priv->metadata_dumped) |
c099397a | 3796 | goto skip_session; |
c099397a | 3797 | |
d793d5e1 | 3798 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3799 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3800 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3801 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3802 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3803 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3804 | |
3805 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3806 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3807 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3808 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3809 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3810 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3811 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3812 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3813 | "\n" |
3814 | "trace {\n" | |
3815 | " major = %u;\n" | |
3816 | " minor = %u;\n" | |
30bdb6e4 | 3817 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3818 | " byte_order = %s;\n" |
3819 | " packet.header := struct {\n" | |
3820 | " uint32_t magic;\n" | |
1ec3f75a | 3821 | " uint8_t uuid[16];\n" |
d793d5e1 | 3822 | " uint32_t stream_id;\n" |
5594698f | 3823 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3824 | " };\n" |
d793d5e1 | 3825 | "};\n\n", |
a90917c3 MD |
3826 | lttng_alignof(uint8_t) * CHAR_BIT, |
3827 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3828 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3829 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3830 | sizeof(unsigned long) * CHAR_BIT, |
3831 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3832 | CTF_SPEC_MAJOR, |
3833 | CTF_SPEC_MINOR, | |
d793d5e1 | 3834 | uuid_s, |
5214fa50 | 3835 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3836 | "be" |
3837 | #else | |
3838 | "le" | |
3839 | #endif | |
3840 | ); | |
3841 | if (ret) | |
3842 | goto end; | |
3843 | ||
99dc9597 MD |
3844 | ret = lttng_metadata_printf(session, |
3845 | "env {\n" | |
a6058143 | 3846 | " hostname = \"%s\";\n" |
c6c9e10f | 3847 | " domain = \"kernel\";\n" |
99dc9597 | 3848 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3849 | " kernel_release = \"%s\";\n" |
3850 | " kernel_version = \"%s\";\n" | |
3851 | " tracer_name = \"lttng-modules\";\n" | |
3852 | " tracer_major = %d;\n" | |
3853 | " tracer_minor = %d;\n" | |
3854 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3855 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3856 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3857 | utsname()->sysname, |
3858 | utsname()->release, | |
c6c9e10f MD |
3859 | utsname()->version, |
3860 | LTTNG_MODULES_MAJOR_VERSION, | |
3861 | LTTNG_MODULES_MINOR_VERSION, | |
3862 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3863 | ); |
3864 | if (ret) | |
3865 | goto end; | |
3866 | ||
8cdc1a81 | 3867 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3868 | if (ret) |
3869 | goto end; | |
3870 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3871 | session->priv->creation_time); |
3eb95be4 JR |
3872 | if (ret) |
3873 | goto end; | |
3874 | ||
c88f762e GB |
3875 | /* Add the product UUID to the 'env' section */ |
3876 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3877 | if (product_uuid) { | |
3878 | ret = lttng_metadata_printf(session, | |
3879 | " product_uuid = \"%s\";\n", | |
3880 | product_uuid | |
3881 | ); | |
3882 | if (ret) | |
3883 | goto end; | |
3884 | } | |
3885 | ||
3886 | /* Close the 'env' section */ | |
3eb95be4 JR |
3887 | ret = lttng_metadata_printf(session, "};\n\n"); |
3888 | if (ret) | |
3889 | goto end; | |
3890 | ||
a3ccff4f MD |
3891 | ret = lttng_metadata_printf(session, |
3892 | "clock {\n" | |
2754583e MD |
3893 | " name = \"%s\";\n", |
3894 | trace_clock_name() | |
a82c63f1 MD |
3895 | ); |
3896 | if (ret) | |
3897 | goto end; | |
3898 | ||
3899 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3900 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3901 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3902 | clock_uuid_s |
3903 | ); | |
3904 | if (ret) | |
3905 | goto end; | |
3906 | } | |
3907 | ||
3908 | ret = lttng_metadata_printf(session, | |
2754583e | 3909 | " description = \"%s\";\n" |
a3ccff4f MD |
3910 | " freq = %llu; /* Frequency, in Hz */\n" |
3911 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3912 | " offset = %lld;\n" |
a3ccff4f | 3913 | "};\n\n", |
2754583e | 3914 | trace_clock_description(), |
a3ccff4f | 3915 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3916 | (long long) measure_clock_offset() |
a3ccff4f MD |
3917 | ); |
3918 | if (ret) | |
3919 | goto end; | |
3920 | ||
3921 | ret = lttng_metadata_printf(session, | |
3922 | "typealias integer {\n" | |
3923 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3924 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3925 | "} := uint27_clock_monotonic_t;\n" |
3926 | "\n" | |
3927 | "typealias integer {\n" | |
3928 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3929 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3930 | "} := uint32_clock_monotonic_t;\n" |
3931 | "\n" | |
3932 | "typealias integer {\n" | |
3933 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3934 | " map = clock.%s.value;\n" |
a3ccff4f | 3935 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3936 | trace_clock_name(), |
a3ccff4f | 3937 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3938 | trace_clock_name(), |
3939 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3940 | trace_clock_name() | |
a3ccff4f MD |
3941 | ); |
3942 | if (ret) | |
3943 | goto end; | |
3944 | ||
a90917c3 | 3945 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3946 | if (ret) |
3947 | goto end; | |
3948 | ||
a90917c3 | 3949 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3950 | if (ret) |
3951 | goto end; | |
3952 | ||
c099397a | 3953 | skip_session: |
f7d06400 MD |
3954 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3955 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3956 | if (ret) |
3957 | goto end; | |
3958 | } | |
3959 | ||
f237aef8 | 3960 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3961 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3962 | if (ret) |
3963 | goto end; | |
3964 | } | |
8cdc1a81 | 3965 | session->priv->metadata_dumped = 1; |
c099397a | 3966 | end: |
8b97fd42 | 3967 | lttng_metadata_end(session); |
c099397a MD |
3968 | return ret; |
3969 | } | |
3970 | ||
c0e31d2e | 3971 | /** |
a90917c3 | 3972 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3973 | * @transport: transport structure |
3974 | * | |
3975 | * Registers a transport which can be used as output to extract the data out of | |
3976 | * LTTng. The module calling this registration function must ensure that no | |
3977 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3978 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3979 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3980 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3981 | * after its registration must it synchronize the TLBs. |
3982 | */ | |
a90917c3 | 3983 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3984 | { |
3985 | /* | |
3986 | * Make sure no page fault can be triggered by the module about to be | |
3987 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3988 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3989 | */ |
263b6c88 | 3990 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3991 | |
3992 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3993 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3994 | mutex_unlock(&sessions_mutex); |
3995 | } | |
a90917c3 | 3996 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3997 | |
3998 | /** | |
a90917c3 | 3999 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4000 | * @transport: transport structure |
4001 | */ | |
a90917c3 | 4002 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4003 | { |
4004 | mutex_lock(&sessions_mutex); | |
4005 | list_del(&transport->node); | |
4006 | mutex_unlock(&sessions_mutex); | |
4007 | } | |
a90917c3 | 4008 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4009 | |
a101fa10 MD |
4010 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4011 | { | |
4012 | /* | |
4013 | * Make sure no page fault can be triggered by the module about to be | |
4014 | * registered. We deal with this here so we don't have to call | |
4015 | * vmalloc_sync_mappings() in each module's init. | |
4016 | */ | |
4017 | wrapper_vmalloc_sync_mappings(); | |
4018 | ||
4019 | mutex_lock(&sessions_mutex); | |
4020 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4021 | mutex_unlock(&sessions_mutex); | |
4022 | } | |
4023 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4024 | ||
4025 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4026 | { | |
4027 | mutex_lock(&sessions_mutex); | |
4028 | list_del(&transport->node); | |
4029 | mutex_unlock(&sessions_mutex); | |
4030 | } | |
4031 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4032 | ||
5f4c791e | 4033 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4034 | |
4035 | enum cpuhp_state lttng_hp_prepare; | |
4036 | enum cpuhp_state lttng_hp_online; | |
4037 | ||
4038 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4039 | { | |
4040 | struct lttng_cpuhp_node *lttng_node; | |
4041 | ||
4042 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4043 | switch (lttng_node->component) { | |
4044 | case LTTNG_RING_BUFFER_FRONTEND: | |
4045 | return 0; | |
4046 | case LTTNG_RING_BUFFER_BACKEND: | |
4047 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4048 | case LTTNG_RING_BUFFER_ITER: | |
4049 | return 0; | |
4050 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4051 | return 0; | |
4052 | default: | |
4053 | return -EINVAL; | |
4054 | } | |
4055 | } | |
4056 | ||
4057 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4058 | { | |
4059 | struct lttng_cpuhp_node *lttng_node; | |
4060 | ||
4061 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4062 | switch (lttng_node->component) { | |
4063 | case LTTNG_RING_BUFFER_FRONTEND: | |
4064 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4065 | case LTTNG_RING_BUFFER_BACKEND: | |
4066 | return 0; | |
4067 | case LTTNG_RING_BUFFER_ITER: | |
4068 | return 0; | |
4069 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4070 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4071 | default: | |
4072 | return -EINVAL; | |
4073 | } | |
4074 | } | |
4075 | ||
4076 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4077 | { | |
4078 | struct lttng_cpuhp_node *lttng_node; | |
4079 | ||
4080 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4081 | switch (lttng_node->component) { | |
4082 | case LTTNG_RING_BUFFER_FRONTEND: | |
4083 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4084 | case LTTNG_RING_BUFFER_BACKEND: | |
4085 | return 0; | |
4086 | case LTTNG_RING_BUFFER_ITER: | |
4087 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4088 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4089 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4090 | default: | |
4091 | return -EINVAL; | |
4092 | } | |
4093 | } | |
4094 | ||
4095 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4096 | { | |
4097 | struct lttng_cpuhp_node *lttng_node; | |
4098 | ||
4099 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4100 | switch (lttng_node->component) { | |
4101 | case LTTNG_RING_BUFFER_FRONTEND: | |
4102 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4103 | case LTTNG_RING_BUFFER_BACKEND: | |
4104 | return 0; | |
4105 | case LTTNG_RING_BUFFER_ITER: | |
4106 | return 0; | |
4107 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4108 | return 0; | |
4109 | default: | |
4110 | return -EINVAL; | |
4111 | } | |
4112 | } | |
4113 | ||
4114 | static int __init lttng_init_cpu_hotplug(void) | |
4115 | { | |
4116 | int ret; | |
4117 | ||
4118 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4119 | lttng_hotplug_prepare, | |
4120 | lttng_hotplug_dead); | |
4121 | if (ret < 0) { | |
4122 | return ret; | |
4123 | } | |
4124 | lttng_hp_prepare = ret; | |
4125 | lttng_rb_set_hp_prepare(ret); | |
4126 | ||
4127 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4128 | lttng_hotplug_online, | |
4129 | lttng_hotplug_offline); | |
4130 | if (ret < 0) { | |
4131 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4132 | lttng_hp_prepare = 0; | |
4133 | return ret; | |
4134 | } | |
4135 | lttng_hp_online = ret; | |
4136 | lttng_rb_set_hp_online(ret); | |
4137 | ||
4138 | return 0; | |
4139 | } | |
4140 | ||
4141 | static void __exit lttng_exit_cpu_hotplug(void) | |
4142 | { | |
4143 | lttng_rb_set_hp_online(0); | |
4144 | cpuhp_remove_multi_state(lttng_hp_online); | |
4145 | lttng_rb_set_hp_prepare(0); | |
4146 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4147 | } | |
4148 | ||
5f4c791e | 4149 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4150 | static int lttng_init_cpu_hotplug(void) |
4151 | { | |
4152 | return 0; | |
4153 | } | |
4154 | static void lttng_exit_cpu_hotplug(void) | |
4155 | { | |
4156 | } | |
5f4c791e | 4157 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4158 | |
a90917c3 | 4159 | static int __init lttng_events_init(void) |
4e3c1b9b | 4160 | { |
1c25284c MD |
4161 | int ret; |
4162 | ||
453b2495 JD |
4163 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4164 | if (ret) | |
4165 | return ret; | |
389d7070 | 4166 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4167 | if (ret) |
4168 | return ret; | |
4169 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4170 | if (ret) |
4171 | return ret; | |
4172 | ret = lttng_probes_init(); | |
389d7070 MD |
4173 | if (ret) |
4174 | return ret; | |
07dfc1d0 | 4175 | ret = lttng_context_init(); |
20591cf7 MD |
4176 | if (ret) |
4177 | return ret; | |
07dfc1d0 MD |
4178 | ret = lttng_tracepoint_init(); |
4179 | if (ret) | |
4180 | goto error_tp; | |
a67ba386 MD |
4181 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4182 | if (!event_recorder_cache) { | |
20591cf7 | 4183 | ret = -ENOMEM; |
a67ba386 | 4184 | goto error_kmem_event_recorder; |
dffef45d | 4185 | } |
a67ba386 MD |
4186 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4187 | if (!event_recorder_private_cache) { | |
4188 | ret = -ENOMEM; | |
4189 | goto error_kmem_event_recorder_private; | |
4190 | } | |
4191 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4192 | if (!event_notifier_cache) { |
4193 | ret = -ENOMEM; | |
4194 | goto error_kmem_event_notifier; | |
20591cf7 | 4195 | } |
a67ba386 MD |
4196 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4197 | if (!event_notifier_private_cache) { | |
4198 | ret = -ENOMEM; | |
4199 | goto error_kmem_event_notifier_private; | |
4200 | } | |
80996790 | 4201 | ret = lttng_abi_init(); |
02119ee5 MD |
4202 | if (ret) |
4203 | goto error_abi; | |
0c956676 MD |
4204 | ret = lttng_logger_init(); |
4205 | if (ret) | |
4206 | goto error_logger; | |
1e367326 MD |
4207 | ret = lttng_init_cpu_hotplug(); |
4208 | if (ret) | |
4209 | goto error_hotplug; | |
101215b7 | 4210 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4211 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4212 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4213 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4214 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4215 | LTTNG_VERSION_NAME, |
4216 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4217 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4218 | #else | |
4219 | "", | |
4220 | #endif | |
4221 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4222 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4223 | #else | |
4224 | ""); | |
4225 | #endif | |
c1551e57 MJ |
4226 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4227 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4228 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4229 | return 0; |
0c956676 | 4230 | |
1e367326 MD |
4231 | error_hotplug: |
4232 | lttng_logger_exit(); | |
0c956676 MD |
4233 | error_logger: |
4234 | lttng_abi_exit(); | |
02119ee5 | 4235 | error_abi: |
a67ba386 MD |
4236 | kmem_cache_destroy(event_notifier_private_cache); |
4237 | error_kmem_event_notifier_private: | |
dffef45d FD |
4238 | kmem_cache_destroy(event_notifier_cache); |
4239 | error_kmem_event_notifier: | |
a67ba386 MD |
4240 | kmem_cache_destroy(event_recorder_private_cache); |
4241 | error_kmem_event_recorder_private: | |
4242 | kmem_cache_destroy(event_recorder_cache); | |
4243 | error_kmem_event_recorder: | |
20591cf7 | 4244 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4245 | error_tp: |
4246 | lttng_context_exit(); | |
101215b7 | 4247 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4248 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4249 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4250 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4251 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4252 | LTTNG_VERSION_NAME, |
4253 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4254 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4255 | #else | |
4256 | "", | |
4257 | #endif | |
4258 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4259 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4260 | #else | |
4261 | ""); | |
4262 | #endif | |
1c25284c | 4263 | return ret; |
4e3c1b9b MD |
4264 | } |
4265 | ||
a90917c3 | 4266 | module_init(lttng_events_init); |
11b5a3c2 | 4267 | |
a90917c3 | 4268 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4269 | { |
8cdc1a81 | 4270 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4271 | |
1e367326 | 4272 | lttng_exit_cpu_hotplug(); |
0c956676 | 4273 | lttng_logger_exit(); |
80996790 | 4274 | lttng_abi_exit(); |
8cdc1a81 MD |
4275 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4276 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4277 | kmem_cache_destroy(event_recorder_cache); |
4278 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4279 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4280 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4281 | lttng_tracepoint_exit(); |
07dfc1d0 | 4282 | lttng_context_exit(); |
101215b7 | 4283 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4284 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4285 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4286 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4287 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4288 | LTTNG_VERSION_NAME, |
4289 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4290 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4291 | #else | |
4292 | "", | |
4293 | #endif | |
4294 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4295 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4296 | #else | |
4297 | ""); | |
4298 | #endif | |
4e3c1b9b | 4299 | } |
92e94819 | 4300 | |
a90917c3 | 4301 | module_exit(lttng_events_exit); |
11b5a3c2 | 4302 | |
7ca11e77 | 4303 | #include <generated/patches.h> |
101215b7 MJ |
4304 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4305 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4306 | #endif | |
4307 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4308 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4309 | #endif | |
92e94819 MD |
4310 | MODULE_LICENSE("GPL and additional rights"); |
4311 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4312 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4313 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4314 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4315 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4316 | LTTNG_MODULES_EXTRAVERSION); |