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 | |
5987e66c MJ |
52 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) |
53 | #include <linux/stdarg.h> | |
54 | #else | |
55 | #include <stdarg.h> | |
56 | #endif | |
57 | ||
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
750b05f2 | 61 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 62 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 63 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
64 | /* |
65 | * Protect the sessions and metadata caches. | |
66 | */ | |
4e3c1b9b | 67 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
68 | static struct kmem_cache *event_recorder_cache; |
69 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 70 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 71 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 72 | |
8cdc1a81 MD |
73 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
74 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 75 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 76 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 77 | |
0648898e | 78 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 79 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
6a338ba4 | 80 | static void _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 81 | static |
ee7e9a18 | 82 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 83 | static |
8cdc1a81 | 84 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
85 | static |
86 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 87 | static |
8cdc1a81 | 88 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
89 | const struct lttng_kernel_type_common *type, |
90 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
91 | size_t nesting); |
92 | static | |
8cdc1a81 | 93 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 94 | const struct lttng_kernel_event_field *field, |
51ef4536 | 95 | size_t nesting, const char **prev_field_name_p); |
c099397a | 96 | |
c099397a | 97 | void synchronize_trace(void) |
abcca994 | 98 | { |
05355f0b MJ |
99 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
100 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
101 | synchronize_rcu(); |
102 | #else | |
abcca994 | 103 | synchronize_sched(); |
92da05ce MJ |
104 | #endif |
105 | ||
5f4c791e | 106 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
107 | #ifdef CONFIG_PREEMPT_RT_FULL |
108 | synchronize_rcu(); | |
109 | #endif | |
5f4c791e | 110 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
111 | #ifdef CONFIG_PREEMPT_RT |
112 | synchronize_rcu(); | |
113 | #endif | |
5f4c791e | 114 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
115 | } |
116 | ||
3c997079 MD |
117 | void lttng_lock_sessions(void) |
118 | { | |
119 | mutex_lock(&sessions_mutex); | |
120 | } | |
121 | ||
122 | void lttng_unlock_sessions(void) | |
123 | { | |
124 | mutex_unlock(&sessions_mutex); | |
125 | } | |
126 | ||
9fe593d2 FD |
127 | static struct lttng_transport *lttng_transport_find(const char *name) |
128 | { | |
129 | struct lttng_transport *transport; | |
130 | ||
131 | list_for_each_entry(transport, <tng_transport_list, node) { | |
132 | if (!strcmp(transport->name, name)) | |
133 | return transport; | |
134 | } | |
135 | return NULL; | |
136 | } | |
137 | ||
3c997079 MD |
138 | /* |
139 | * Called with sessions lock held. | |
140 | */ | |
141 | int lttng_session_active(void) | |
142 | { | |
8cdc1a81 | 143 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
144 | |
145 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 146 | if (iter->pub->active) |
3c997079 MD |
147 | return 1; |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
8cdc1a81 | 152 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 153 | { |
8cdc1a81 MD |
154 | struct lttng_kernel_session *session; |
155 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 156 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 157 | int i; |
4e3c1b9b MD |
158 | |
159 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 160 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 161 | if (!session) |
d83004aa | 162 | goto err; |
8cdc1a81 MD |
163 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
164 | if (!session_priv) | |
165 | goto err_free_session; | |
166 | session->priv = session_priv; | |
167 | session_priv->pub = session; | |
168 | ||
169 | INIT_LIST_HEAD(&session_priv->chan); | |
170 | INIT_LIST_HEAD(&session_priv->events); | |
171 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
172 | |
173 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
174 | GFP_KERNEL); | |
175 | if (!metadata_cache) | |
8cdc1a81 | 176 | goto err_free_session_private; |
0ca42eb7 | 177 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
178 | if (!metadata_cache->data) |
179 | goto err_free_cache; | |
180 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
181 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 182 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 183 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 184 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 185 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 186 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 187 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 188 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
189 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
190 | list_add(&session_priv->list, &sessions); | |
191 | ||
8c0393c3 MD |
192 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
197 | goto tracker_alloc_error; | |
198 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
199 | goto tracker_alloc_error; | |
200 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
201 | goto tracker_alloc_error; | |
202 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
203 | goto tracker_alloc_error; | |
204 | ||
4e3c1b9b | 205 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 206 | |
4e3c1b9b | 207 | return session; |
d83004aa | 208 | |
8c0393c3 MD |
209 | tracker_alloc_error: |
210 | lttng_id_tracker_fini(&session->pid_tracker); | |
211 | lttng_id_tracker_fini(&session->vpid_tracker); | |
212 | lttng_id_tracker_fini(&session->uid_tracker); | |
213 | lttng_id_tracker_fini(&session->vuid_tracker); | |
214 | lttng_id_tracker_fini(&session->gid_tracker); | |
215 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
216 | err_free_cache: |
217 | kfree(metadata_cache); | |
8cdc1a81 MD |
218 | err_free_session_private: |
219 | lttng_kvfree(session_priv); | |
d83004aa | 220 | err_free_session: |
48f5e0b5 | 221 | lttng_kvfree(session); |
d83004aa JD |
222 | err: |
223 | mutex_unlock(&sessions_mutex); | |
224 | return NULL; | |
225 | } | |
226 | ||
99f52fcc FD |
227 | static |
228 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
229 | { | |
230 | struct lttng_counter_transport *transport; | |
231 | ||
232 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
233 | if (!strcmp(transport->name, name)) | |
234 | return transport; | |
235 | } | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | struct lttng_counter *lttng_kernel_counter_create( | |
240 | const char *counter_transport_name, | |
241 | size_t number_dimensions, const size_t *dimensions_sizes) | |
242 | { | |
243 | struct lttng_counter *counter = NULL; | |
244 | struct lttng_counter_transport *counter_transport = NULL; | |
245 | ||
246 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
247 | if (!counter_transport) { | |
248 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
249 | counter_transport_name); | |
250 | goto notransport; | |
251 | } | |
252 | if (!try_module_get(counter_transport->owner)) { | |
253 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
254 | goto notransport; | |
255 | } | |
256 | ||
257 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
258 | if (!counter) | |
259 | goto nomem; | |
260 | ||
261 | /* Create event notifier error counter. */ | |
262 | counter->ops = &counter_transport->ops; | |
263 | counter->transport = counter_transport; | |
264 | ||
265 | counter->counter = counter->ops->counter_create( | |
266 | number_dimensions, dimensions_sizes, 0); | |
267 | if (!counter->counter) { | |
268 | goto create_error; | |
269 | } | |
270 | ||
271 | return counter; | |
272 | ||
273 | create_error: | |
274 | lttng_kvfree(counter); | |
275 | nomem: | |
276 | if (counter_transport) | |
277 | module_put(counter_transport->owner); | |
278 | notransport: | |
279 | return NULL; | |
280 | } | |
281 | ||
750b05f2 FD |
282 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
283 | { | |
284 | struct lttng_transport *transport = NULL; | |
285 | struct lttng_event_notifier_group *event_notifier_group; | |
286 | const char *transport_name = "relay-event-notifier"; | |
287 | size_t subbuf_size = 4096; //TODO | |
288 | size_t num_subbuf = 16; //TODO | |
289 | unsigned int switch_timer_interval = 0; | |
290 | unsigned int read_timer_interval = 0; | |
dffef45d | 291 | int i; |
750b05f2 FD |
292 | |
293 | mutex_lock(&sessions_mutex); | |
294 | ||
295 | transport = lttng_transport_find(transport_name); | |
296 | if (!transport) { | |
297 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
298 | transport_name); | |
299 | goto notransport; | |
300 | } | |
301 | if (!try_module_get(transport->owner)) { | |
302 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
303 | transport_name); | |
304 | goto notransport; | |
305 | } | |
306 | ||
307 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
308 | GFP_KERNEL); | |
309 | if (!event_notifier_group) | |
310 | goto nomem; | |
311 | ||
312 | /* | |
313 | * Initialize the ring buffer used to store event notifier | |
314 | * notifications. | |
315 | */ | |
316 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 317 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
318 | transport_name, event_notifier_group, NULL, |
319 | subbuf_size, num_subbuf, switch_timer_interval, | |
320 | read_timer_interval); | |
321 | if (!event_notifier_group->chan) | |
322 | goto create_error; | |
323 | ||
324 | event_notifier_group->transport = transport; | |
dffef45d FD |
325 | |
326 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
327 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
328 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
329 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 330 | |
750b05f2 FD |
331 | list_add(&event_notifier_group->node, &event_notifier_groups); |
332 | ||
333 | mutex_unlock(&sessions_mutex); | |
334 | ||
335 | return event_notifier_group; | |
336 | ||
337 | create_error: | |
338 | lttng_kvfree(event_notifier_group); | |
339 | nomem: | |
340 | if (transport) | |
341 | module_put(transport->owner); | |
342 | notransport: | |
343 | mutex_unlock(&sessions_mutex); | |
344 | return NULL; | |
345 | } | |
346 | ||
d83004aa JD |
347 | void metadata_cache_destroy(struct kref *kref) |
348 | { | |
349 | struct lttng_metadata_cache *cache = | |
350 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 351 | vfree(cache->data); |
d83004aa | 352 | kfree(cache); |
4e3c1b9b MD |
353 | } |
354 | ||
8cdc1a81 | 355 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 356 | { |
f7d06400 | 357 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 358 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 359 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 360 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 361 | int ret; |
4e3c1b9b MD |
362 | |
363 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 364 | WRITE_ONCE(session->active, 0); |
f7d06400 | 365 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 366 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
367 | WARN_ON(ret); |
368 | } | |
6a338ba4 MD |
369 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) |
370 | _lttng_event_unregister(&event_recorder_priv->pub->parent); | |
abcca994 | 371 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 372 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 373 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
374 | WARN_ON(ret); |
375 | } | |
09710b83 MD |
376 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
377 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 378 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 379 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
380 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
381 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
382 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 383 | } |
8cdc1a81 MD |
384 | mutex_lock(&session->priv->metadata_cache->lock); |
385 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 386 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 387 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
388 | lttng_id_tracker_fini(&session->pid_tracker); |
389 | lttng_id_tracker_fini(&session->vpid_tracker); | |
390 | lttng_id_tracker_fini(&session->uid_tracker); | |
391 | lttng_id_tracker_fini(&session->vuid_tracker); | |
392 | lttng_id_tracker_fini(&session->gid_tracker); | |
393 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
394 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
395 | list_del(&session->priv->list); | |
4e3c1b9b | 396 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 397 | lttng_kvfree(session->priv); |
48f5e0b5 | 398 | lttng_kvfree(session); |
4e3c1b9b MD |
399 | } |
400 | ||
dffef45d FD |
401 | void lttng_event_notifier_group_destroy( |
402 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 403 | { |
09710b83 | 404 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 405 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
406 | int ret; |
407 | ||
750b05f2 FD |
408 | if (!event_notifier_group) |
409 | return; | |
410 | ||
411 | mutex_lock(&sessions_mutex); | |
dffef45d | 412 | |
6053e75e | 413 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
414 | WARN_ON(ret); |
415 | ||
a67ba386 | 416 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
6a338ba4 MD |
417 | &event_notifier_group->event_notifiers_head, parent.node) |
418 | _lttng_event_unregister(&event_notifier_priv->pub->parent); | |
dffef45d | 419 | |
b01155ba FD |
420 | /* Wait for in-flight event notifier to complete */ |
421 | synchronize_trace(); | |
422 | ||
21f58fb7 FD |
423 | irq_work_sync(&event_notifier_group->wakeup_pending); |
424 | ||
6053e75e MD |
425 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
426 | WARN_ON(ret); | |
8a8ac9a8 | 427 | |
09710b83 | 428 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 429 | &event_notifier_group->enablers_head, node) |
09710b83 | 430 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 431 | |
a67ba386 | 432 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 433 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 434 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 435 | |
99f52fcc FD |
436 | if (event_notifier_group->error_counter) { |
437 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 438 | |
99f52fcc FD |
439 | error_counter->ops->counter_destroy(error_counter->counter); |
440 | module_put(error_counter->transport->owner); | |
441 | lttng_kvfree(error_counter); | |
442 | event_notifier_group->error_counter = NULL; | |
443 | } | |
444 | ||
4a399b76 | 445 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
446 | module_put(event_notifier_group->transport->owner); |
447 | list_del(&event_notifier_group->node); | |
dffef45d | 448 | |
750b05f2 FD |
449 | mutex_unlock(&sessions_mutex); |
450 | lttng_kvfree(event_notifier_group); | |
451 | } | |
452 | ||
8cdc1a81 | 453 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
454 | { |
455 | int ret; | |
456 | ||
457 | mutex_lock(&sessions_mutex); | |
458 | ret = lttng_statedump_start(session); | |
459 | mutex_unlock(&sessions_mutex); | |
460 | return ret; | |
461 | } | |
462 | ||
8cdc1a81 | 463 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
464 | { |
465 | int ret = 0; | |
f7d06400 | 466 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
467 | |
468 | mutex_lock(&sessions_mutex); | |
469 | if (session->active) { | |
470 | ret = -EBUSY; | |
471 | goto end; | |
472 | } | |
c099397a | 473 | |
3c997079 | 474 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 475 | session->priv->tstate = 1; |
3c997079 | 476 | |
4ef81e4a | 477 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 478 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 479 | |
c099397a MD |
480 | /* |
481 | * Snapshot the number of events per channel to know the type of header | |
482 | * we need to use. | |
483 | */ | |
f7d06400 MD |
484 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
485 | if (chan_priv->header_type) | |
486 | continue; /* don't change it if session stop/restart */ | |
487 | if (chan_priv->free_event_id < 31) | |
488 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 489 | else |
f7d06400 | 490 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
491 | } |
492 | ||
64af2437 | 493 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
494 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
495 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
496 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 497 | } |
64af2437 | 498 | |
a8f2d0c7 | 499 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 500 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 501 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 502 | if (ret) { |
a8f2d0c7 | 503 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
504 | goto end; |
505 | } | |
506 | ret = lttng_statedump_start(session); | |
360f38ea | 507 | if (ret) |
a8f2d0c7 | 508 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
509 | end: |
510 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 511 | return ret; |
c0e31d2e MD |
512 | } |
513 | ||
8cdc1a81 | 514 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
515 | { |
516 | int ret = 0; | |
f7d06400 | 517 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
518 | |
519 | mutex_lock(&sessions_mutex); | |
520 | if (!session->active) { | |
521 | ret = -EBUSY; | |
522 | goto end; | |
523 | } | |
a8f2d0c7 | 524 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
525 | |
526 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 527 | session->priv->tstate = 0; |
b2bc0bc8 | 528 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
529 | |
530 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
531 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
532 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
533 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 534 | } |
c0e31d2e MD |
535 | end: |
536 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 537 | return ret; |
c0e31d2e MD |
538 | } |
539 | ||
8cdc1a81 | 540 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
541 | { |
542 | int ret = 0; | |
f7d06400 | 543 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 544 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 545 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
546 | struct lttng_metadata_stream *stream; |
547 | ||
548 | mutex_lock(&sessions_mutex); | |
549 | if (!session->active) { | |
550 | ret = -EBUSY; | |
551 | goto end; | |
552 | } | |
553 | ||
554 | mutex_lock(&cache->lock); | |
555 | memset(cache->data, 0, cache->cache_alloc); | |
556 | cache->metadata_written = 0; | |
557 | cache->version++; | |
8cdc1a81 | 558 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
559 | stream->metadata_out = 0; |
560 | stream->metadata_in = 0; | |
561 | } | |
562 | mutex_unlock(&cache->lock); | |
563 | ||
8cdc1a81 | 564 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
565 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
566 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
567 | } |
568 | ||
f237aef8 | 569 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 570 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
571 | } |
572 | ||
573 | ret = _lttng_session_metadata_statedump(session); | |
574 | ||
575 | end: | |
576 | mutex_unlock(&sessions_mutex); | |
577 | return ret; | |
578 | } | |
579 | ||
6b757027 MD |
580 | static |
581 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
582 | { | |
583 | struct lttng_kernel_channel_buffer *chan_buf; | |
584 | ||
585 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
586 | return false; | |
587 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
588 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
589 | return true; | |
590 | return false; | |
591 | } | |
592 | ||
593 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 594 | { |
3c997079 | 595 | int ret = 0; |
e64957da | 596 | |
3c997079 | 597 | mutex_lock(&sessions_mutex); |
6b757027 | 598 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
599 | ret = -EPERM; |
600 | goto end; | |
601 | } | |
6b757027 | 602 | if (channel->enabled) { |
3c997079 MD |
603 | ret = -EEXIST; |
604 | goto end; | |
605 | } | |
606 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
607 | channel->priv->tstate = 1; |
608 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 609 | /* Set atomically the state to "enabled" */ |
6b757027 | 610 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
611 | end: |
612 | mutex_unlock(&sessions_mutex); | |
613 | return ret; | |
e64957da MD |
614 | } |
615 | ||
6b757027 | 616 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 617 | { |
3c997079 | 618 | int ret = 0; |
e64957da | 619 | |
3c997079 | 620 | mutex_lock(&sessions_mutex); |
6b757027 | 621 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
622 | ret = -EPERM; |
623 | goto end; | |
624 | } | |
6b757027 | 625 | if (!channel->enabled) { |
3c997079 MD |
626 | ret = -EEXIST; |
627 | goto end; | |
628 | } | |
629 | /* Set atomically the state to "disabled" */ | |
6b757027 | 630 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 631 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
632 | channel->priv->tstate = 0; |
633 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
634 | end: |
635 | mutex_unlock(&sessions_mutex); | |
636 | return ret; | |
e64957da MD |
637 | } |
638 | ||
9d993668 | 639 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 640 | { |
3c997079 | 641 | int ret = 0; |
e64957da | 642 | |
3c997079 | 643 | mutex_lock(&sessions_mutex); |
9d993668 MD |
644 | switch (event->type) { |
645 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
646 | { | |
647 | struct lttng_kernel_event_recorder *event_recorder = | |
648 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
649 | ||
f7d06400 | 650 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
651 | ret = -EPERM; |
652 | goto end; | |
653 | } | |
a0493bef | 654 | break; |
9d993668 MD |
655 | } |
656 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
657 | switch (event->priv->instrumentation) { | |
658 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
659 | ret = -EINVAL; | |
660 | goto end; | |
661 | default: | |
662 | break; | |
663 | } | |
a0493bef MD |
664 | break; |
665 | default: | |
9d993668 | 666 | break; |
a0493bef | 667 | } |
e64957da | 668 | |
9d993668 | 669 | if (event->enabled) { |
3c997079 MD |
670 | ret = -EEXIST; |
671 | goto end; | |
672 | } | |
a67ba386 | 673 | switch (event->priv->instrumentation) { |
c190d76e MJ |
674 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
675 | lttng_fallthrough; | |
606828e4 | 676 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
677 | ret = -EINVAL; |
678 | break; | |
b4a75708 | 679 | |
c190d76e MJ |
680 | case LTTNG_KERNEL_ABI_KPROBE: |
681 | lttng_fallthrough; | |
606828e4 | 682 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 683 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 684 | break; |
b4a75708 | 685 | |
606828e4 | 686 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 687 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 688 | break; |
b4a75708 | 689 | |
c190d76e MJ |
690 | case LTTNG_KERNEL_ABI_FUNCTION: |
691 | lttng_fallthrough; | |
692 | case LTTNG_KERNEL_ABI_NOOP: | |
693 | lttng_fallthrough; | |
a0493bef MD |
694 | default: |
695 | WARN_ON_ONCE(1); | |
696 | ret = -EINVAL; | |
697 | } | |
3c997079 MD |
698 | end: |
699 | mutex_unlock(&sessions_mutex); | |
700 | return ret; | |
e64957da MD |
701 | } |
702 | ||
9d993668 | 703 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
704 | { |
705 | int ret = 0; | |
706 | ||
707 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
708 | switch (event->type) { |
709 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
710 | { | |
711 | struct lttng_kernel_event_recorder *event_recorder = | |
712 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
713 | ||
f7d06400 | 714 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
715 | ret = -EPERM; |
716 | goto end; | |
717 | } | |
b01155ba | 718 | break; |
9d993668 MD |
719 | } |
720 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
721 | switch (event->priv->instrumentation) { | |
722 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
723 | ret = -EINVAL; | |
724 | goto end; | |
725 | default: | |
726 | break; | |
727 | } | |
2b16f0c9 | 728 | break; |
dffef45d | 729 | default: |
9d993668 | 730 | break; |
dffef45d | 731 | } |
dffef45d | 732 | |
a67ba386 | 733 | if (!event->enabled) { |
dffef45d FD |
734 | ret = -EEXIST; |
735 | goto end; | |
736 | } | |
a67ba386 | 737 | switch (event->priv->instrumentation) { |
c190d76e MJ |
738 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
739 | lttng_fallthrough; | |
606828e4 | 740 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
741 | ret = -EINVAL; |
742 | break; | |
b4a75708 | 743 | |
c190d76e MJ |
744 | case LTTNG_KERNEL_ABI_KPROBE: |
745 | lttng_fallthrough; | |
606828e4 | 746 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 747 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 748 | break; |
b4a75708 | 749 | |
9d993668 MD |
750 | case LTTNG_KERNEL_ABI_KRETPROBE: |
751 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
752 | break; | |
753 | ||
c190d76e MJ |
754 | case LTTNG_KERNEL_ABI_FUNCTION: |
755 | lttng_fallthrough; | |
756 | case LTTNG_KERNEL_ABI_NOOP: | |
757 | lttng_fallthrough; | |
dffef45d FD |
758 | default: |
759 | WARN_ON_ONCE(1); | |
760 | ret = -EINVAL; | |
761 | } | |
762 | end: | |
763 | mutex_unlock(&sessions_mutex); | |
764 | return ret; | |
765 | } | |
766 | ||
4e252d1e | 767 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
768 | const char *transport_name, |
769 | void *buf_addr, | |
4e3c1b9b MD |
770 | size_t subbuf_size, size_t num_subbuf, |
771 | unsigned int switch_timer_interval, | |
d83004aa JD |
772 | unsigned int read_timer_interval, |
773 | enum channel_type channel_type) | |
4e3c1b9b | 774 | { |
f7d06400 MD |
775 | struct lttng_kernel_channel_buffer *chan; |
776 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 777 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
778 | |
779 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 780 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 781 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 782 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 783 | if (!transport) { |
5a15f70c | 784 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 785 | transport_name); |
c0e31d2e | 786 | goto notransport; |
f3d01b96 | 787 | } |
a33c9927 | 788 | if (!try_module_get(transport->owner)) { |
5a15f70c | 789 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
790 | goto notransport; |
791 | } | |
f7d06400 | 792 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 793 | if (!chan) |
c0e31d2e | 794 | goto nomem; |
f7d06400 MD |
795 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
796 | if (!chan_priv) | |
797 | goto nomem_priv; | |
798 | chan->priv = chan_priv; | |
799 | chan_priv->pub = chan; | |
800 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
801 | chan->parent.session = session; | |
802 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 803 | chan->ops = &transport->ops; |
125b4df4 MD |
804 | /* |
805 | * Note: the channel creation op already writes into the packet | |
806 | * headers. Therefore the "chan" information used as input | |
807 | * should be already accessible. | |
808 | */ | |
f7d06400 | 809 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
810 | chan, buf_addr, subbuf_size, num_subbuf, |
811 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 812 | if (!chan->priv->rb_chan) |
f3d01b96 | 813 | goto create_error; |
f7d06400 MD |
814 | chan->priv->parent.tstate = 1; |
815 | chan->parent.enabled = 1; | |
816 | chan->priv->transport = transport; | |
817 | chan->priv->channel_type = channel_type; | |
818 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
819 | mutex_unlock(&sessions_mutex); |
820 | return chan; | |
821 | ||
f3d01b96 | 822 | create_error: |
f7d06400 MD |
823 | kfree(chan_priv); |
824 | nomem_priv: | |
f3d01b96 | 825 | kfree(chan); |
c0e31d2e | 826 | nomem: |
a33c9927 MD |
827 | if (transport) |
828 | module_put(transport->owner); | |
c0e31d2e | 829 | notransport: |
e5382b6d | 830 | active: |
4e3c1b9b MD |
831 | mutex_unlock(&sessions_mutex); |
832 | return NULL; | |
833 | } | |
834 | ||
835 | /* | |
d83004aa JD |
836 | * Only used internally at session destruction for per-cpu channels, and |
837 | * when metadata channel is released. | |
838 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 839 | */ |
aa7c23a9 | 840 | static |
f7d06400 | 841 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 842 | { |
f7d06400 MD |
843 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
844 | module_put(chan->priv->transport->owner); | |
845 | list_del(&chan->priv->node); | |
846 | lttng_kernel_destroy_context(chan->priv->ctx); | |
847 | kfree(chan->priv); | |
4e3c1b9b MD |
848 | kfree(chan); |
849 | } | |
850 | ||
f7d06400 | 851 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 852 | { |
f7d06400 | 853 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
854 | |
855 | /* Protect the metadata cache with the sessions_mutex. */ | |
856 | mutex_lock(&sessions_mutex); | |
857 | _lttng_channel_destroy(chan); | |
858 | mutex_unlock(&sessions_mutex); | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
861 | ||
862 | static | |
863 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
864 | { | |
865 | stream->finalized = 1; | |
866 | wake_up_interruptible(&stream->read_wait); | |
867 | } | |
868 | ||
51d248b5 MD |
869 | static |
870 | bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler) | |
871 | { | |
872 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
873 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
874 | ||
875 | switch (event_enabler->enabler_type) { | |
876 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
877 | { | |
878 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
879 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
880 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
881 | ||
882 | switch (itype) { | |
883 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
884 | lttng_fallthrough; | |
885 | case LTTNG_KERNEL_ABI_KPROBE: | |
886 | lttng_fallthrough; | |
887 | case LTTNG_KERNEL_ABI_SYSCALL: | |
888 | lttng_fallthrough; | |
889 | case LTTNG_KERNEL_ABI_UPROBE: | |
890 | if (chan->priv->free_event_id == -1U) | |
891 | return false; | |
892 | return true; | |
893 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
894 | /* kretprobes require 2 event IDs. */ | |
895 | if (chan->priv->free_event_id >= -2U) | |
896 | return false; | |
897 | return true; | |
898 | default: | |
899 | WARN_ON_ONCE(1); | |
900 | return false; | |
901 | } | |
902 | } | |
903 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
904 | return true; | |
905 | default: | |
906 | WARN_ON_ONCE(1); | |
907 | return false; | |
908 | } | |
909 | } | |
910 | ||
756a020c MD |
911 | static |
912 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
913 | { | |
914 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
915 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
916 | ||
917 | switch (event_enabler->enabler_type) { | |
918 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
919 | { | |
920 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
921 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
922 | struct lttng_kernel_event_recorder *event_recorder; | |
923 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
924 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
925 | ||
926 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
927 | if (!event_recorder) | |
928 | return NULL; | |
929 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
930 | if (!event_recorder_priv) { | |
931 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
932 | return NULL; | |
933 | } | |
934 | event_recorder_priv->pub = event_recorder; | |
935 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
936 | event_recorder->priv = event_recorder_priv; | |
937 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
938 | ||
939 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
940 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
941 | event_recorder->priv->parent.instrumentation = itype; | |
942 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
943 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
944 | ||
945 | event_recorder->chan = chan; | |
946 | event_recorder->priv->id = chan->priv->free_event_id++; | |
947 | return &event_recorder->parent; | |
948 | } | |
949 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
950 | { | |
951 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
952 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
953 | struct lttng_kernel_event_notifier *event_notifier; | |
954 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
955 | ||
956 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
957 | if (!event_notifier) | |
958 | return NULL; | |
959 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
960 | if (!event_notifier_priv) { | |
961 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
962 | return NULL; | |
963 | } | |
964 | event_notifier_priv->pub = event_notifier; | |
965 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
966 | event_notifier->priv = event_notifier_priv; | |
967 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
968 | ||
969 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
970 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
971 | event_notifier->priv->parent.instrumentation = itype; | |
972 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
973 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
974 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
975 | ||
976 | event_notifier->priv->group = event_notifier_enabler->group; | |
977 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
978 | event_notifier->priv->num_captures = 0; | |
979 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
980 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
981 | return &event_notifier->parent; | |
982 | } | |
983 | default: | |
984 | return NULL; | |
985 | } | |
986 | } | |
987 | ||
988 | static | |
989 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
990 | { | |
991 | switch (event->type) { | |
992 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
993 | { | |
994 | struct lttng_kernel_event_recorder *event_recorder = | |
995 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
996 | ||
997 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
998 | kmem_cache_free(event_recorder_cache, event_recorder); | |
999 | break; | |
1000 | } | |
1001 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1002 | { | |
1003 | struct lttng_kernel_event_notifier *event_notifier = | |
1004 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1005 | ||
1006 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1007 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1008 | break; | |
1009 | } | |
1010 | default: | |
1011 | WARN_ON_ONCE(1); | |
1012 | } | |
1013 | } | |
a101fa10 | 1014 | |
ccefc7ab MD |
1015 | static |
1016 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
1017 | { | |
1018 | switch (event->type) { | |
1019 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1020 | return 0; | |
1021 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1022 | { | |
1023 | struct lttng_kernel_event_notifier *event_notifier = | |
1024 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1025 | struct lttng_counter *error_counter; | |
1026 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
1027 | size_t dimension_index[1]; | |
1028 | int ret; | |
1029 | ||
1030 | /* | |
1031 | * Clear the error counter bucket. The sessiond keeps track of which | |
1032 | * bucket is currently in use. We trust it. The session lock | |
1033 | * synchronizes against concurrent creation of the error | |
1034 | * counter. | |
1035 | */ | |
1036 | error_counter = event_notifier_group->error_counter; | |
1037 | if (!error_counter) | |
1038 | return 0; | |
1039 | /* | |
1040 | * Check that the index is within the boundary of the counter. | |
1041 | */ | |
1042 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1043 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1044 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | ||
1048 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1049 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1050 | if (ret) { | |
1051 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1052 | event_notifier->priv->error_counter_index); | |
1053 | return -EINVAL; | |
1054 | } | |
1055 | return 0; | |
1056 | } | |
1057 | default: | |
1058 | return -EINVAL; | |
1059 | } | |
1060 | } | |
1061 | ||
e5382b6d MD |
1062 | /* |
1063 | * Supports event creation while tracing session is active. | |
3c997079 | 1064 | * Needs to be called with sessions mutex held. |
e5382b6d | 1065 | */ |
13a2dfca | 1066 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
def1e304 | 1067 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1068 | { |
13a2dfca MD |
1069 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
1070 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); | |
1071 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
def1e304 | 1072 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1073 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1074 | struct lttng_kernel_event_common *event; |
3c997079 MD |
1075 | const char *event_name; |
1076 | struct hlist_head *head; | |
3d084699 | 1077 | int ret; |
4e3c1b9b | 1078 | |
13a2dfca | 1079 | if (!lttng_kernel_event_id_available(event_enabler)) { |
4cf0bf51 | 1080 | ret = -EMFILE; |
e5382b6d | 1081 | goto full; |
abc0446a | 1082 | } |
3c997079 MD |
1083 | |
1084 | switch (itype) { | |
606828e4 | 1085 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1086 | event_name = event_desc->event_name; |
3c997079 | 1087 | break; |
b4a75708 | 1088 | |
c190d76e MJ |
1089 | case LTTNG_KERNEL_ABI_KPROBE: |
1090 | lttng_fallthrough; | |
1091 | case LTTNG_KERNEL_ABI_UPROBE: | |
1092 | lttng_fallthrough; | |
1093 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1094 | lttng_fallthrough; | |
606828e4 | 1095 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1096 | event_name = event_param->name; |
1097 | break; | |
b4a75708 | 1098 | |
c190d76e MJ |
1099 | case LTTNG_KERNEL_ABI_FUNCTION: |
1100 | lttng_fallthrough; | |
1101 | case LTTNG_KERNEL_ABI_NOOP: | |
1102 | lttng_fallthrough; | |
3c997079 MD |
1103 | default: |
1104 | WARN_ON_ONCE(1); | |
1105 | ret = -EINVAL; | |
1106 | goto type_error; | |
1107 | } | |
4a11ef1c | 1108 | |
0def9170 | 1109 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1110 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
13a2dfca | 1111 | if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) { |
3c997079 MD |
1112 | ret = -EEXIST; |
1113 | goto exist; | |
abc0446a MD |
1114 | } |
1115 | } | |
3c997079 | 1116 | |
13a2dfca | 1117 | event = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1118 | if (!event) { |
4cf0bf51 | 1119 | ret = -ENOMEM; |
756a020c | 1120 | goto alloc_error; |
abc0446a | 1121 | } |
3c997079 MD |
1122 | |
1123 | switch (itype) { | |
606828e4 | 1124 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1125 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1126 | event->enabled = 0; |
1127 | event->priv->registered = 0; | |
1128 | event->priv->desc = lttng_event_desc_get(event_name); | |
1129 | if (!event->priv->desc) { | |
4cf0bf51 | 1130 | ret = -ENOENT; |
d3dbe23c | 1131 | goto register_error; |
abc0446a | 1132 | } |
3c997079 MD |
1133 | /* Populate lttng_event structure before event registration. */ |
1134 | smp_wmb(); | |
baf20995 | 1135 | break; |
b4a75708 | 1136 | |
606828e4 | 1137 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1138 | /* |
1139 | * Needs to be explicitly enabled after creation, since | |
1140 | * we may want to apply filters. | |
1141 | */ | |
7cd0f696 MD |
1142 | event->enabled = 0; |
1143 | event->priv->registered = 1; | |
3c997079 MD |
1144 | /* |
1145 | * Populate lttng_event structure before event | |
1146 | * registration. | |
1147 | */ | |
1148 | smp_wmb(); | |
8bf17deb | 1149 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1150 | event_param->u.kprobe.symbol_name, |
1151 | event_param->u.kprobe.offset, | |
1152 | event_param->u.kprobe.addr, | |
7cd0f696 | 1153 | event); |
abc0446a | 1154 | if (ret) { |
4cf0bf51 | 1155 | ret = -EINVAL; |
d6d808f3 | 1156 | goto register_error; |
abc0446a | 1157 | } |
7cd0f696 | 1158 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1159 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1160 | break; |
b4a75708 | 1161 | |
606828e4 | 1162 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1163 | { |
756a020c | 1164 | struct lttng_kernel_event_common *event_return; |
7371f44c MD |
1165 | |
1166 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1167 | /* |
1168 | * Needs to be explicitly enabled after creation, since | |
1169 | * we may want to apply filters. | |
1170 | */ | |
756a020c MD |
1171 | event->enabled = 0; |
1172 | event->priv->registered = 1; | |
a67ba386 | 1173 | |
13a2dfca | 1174 | event_return = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1175 | if (!event) { |
a67ba386 | 1176 | ret = -ENOMEM; |
756a020c | 1177 | goto alloc_error; |
a67ba386 | 1178 | } |
756a020c MD |
1179 | |
1180 | event_return->enabled = 0; | |
1181 | event_return->priv->registered = 1; | |
1182 | ||
7371f44c | 1183 | /* |
a90917c3 | 1184 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1185 | */ |
1186 | smp_wmb(); | |
3c997079 | 1187 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1188 | event_param->u.kretprobe.symbol_name, |
1189 | event_param->u.kretprobe.offset, | |
1190 | event_param->u.kretprobe.addr, | |
756a020c | 1191 | event, event_return); |
7371f44c | 1192 | if (ret) { |
756a020c | 1193 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1194 | ret = -EINVAL; |
7371f44c MD |
1195 | goto register_error; |
1196 | } | |
1197 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1198 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1199 | WARN_ON_ONCE(!ret); |
756a020c | 1200 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1201 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1202 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1203 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1204 | if (ret) { |
756a020c | 1205 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1206 | module_put(event_return->priv->desc->owner); |
1207 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1208 | goto statedump_error; |
1209 | } | |
19b98250 | 1210 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1211 | break; |
1212 | } | |
b4a75708 | 1213 | |
606828e4 | 1214 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1215 | /* |
1216 | * Needs to be explicitly enabled after creation, since | |
1217 | * we may want to apply filters. | |
1218 | */ | |
7cd0f696 MD |
1219 | event->enabled = 0; |
1220 | event->priv->registered = 0; | |
1221 | event->priv->desc = event_desc; | |
badfe9f5 | 1222 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1223 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1224 | ret = -EINVAL; |
1225 | goto register_error; | |
606828e4 | 1226 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1227 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1228 | break; |
606828e4 | 1229 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1230 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1231 | break; |
1232 | } | |
1233 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1235 | ret = -EINVAL; |
1236 | goto register_error; | |
606828e4 | 1237 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1238 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1239 | break; |
606828e4 | 1240 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1241 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1242 | break; |
1243 | } | |
7cd0f696 | 1244 | if (!event->priv->desc) { |
4cf0bf51 | 1245 | ret = -EINVAL; |
259b6cb3 | 1246 | goto register_error; |
abc0446a | 1247 | } |
1ec65de1 | 1248 | break; |
b4a75708 | 1249 | |
606828e4 | 1250 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1251 | /* |
1252 | * Needs to be explicitly enabled after creation, since | |
1253 | * we may want to apply filters. | |
1254 | */ | |
7cd0f696 MD |
1255 | event->enabled = 0; |
1256 | event->priv->registered = 1; | |
3aed4dca | 1257 | |
a344f64b FD |
1258 | /* |
1259 | * Populate lttng_event structure before event | |
1260 | * registration. | |
1261 | */ | |
1262 | smp_wmb(); | |
149b9a9d | 1263 | |
83b802dc | 1264 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1265 | event_param->u.uprobe.fd, |
7cd0f696 | 1266 | event); |
149b9a9d YB |
1267 | if (ret) |
1268 | goto register_error; | |
7cd0f696 | 1269 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1270 | WARN_ON_ONCE(!ret); |
1271 | break; | |
b4a75708 | 1272 | |
baf20995 MD |
1273 | default: |
1274 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1275 | ret = -EINVAL; |
df07930b | 1276 | goto register_error; |
baf20995 | 1277 | } |
13a2dfca | 1278 | |
ee7e9a18 | 1279 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1280 | WARN_ON_ONCE(ret > 0); |
1281 | if (ret) { | |
c099397a | 1282 | goto statedump_error; |
abc0446a | 1283 | } |
dffef45d | 1284 | |
ccefc7ab MD |
1285 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1286 | if (ret) | |
1287 | goto register_error; | |
c4e31059 | 1288 | |
c4e31059 | 1289 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1290 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1291 | |
13a2dfca | 1292 | return event; |
dffef45d | 1293 | |
13a2dfca MD |
1294 | statedump_error: |
1295 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1296 | register_error: |
756a020c MD |
1297 | lttng_kernel_event_free(event); |
1298 | alloc_error: | |
dffef45d FD |
1299 | exist: |
1300 | type_error: | |
13a2dfca | 1301 | full: |
dffef45d FD |
1302 | return ERR_PTR(ret); |
1303 | } | |
1304 | ||
83006ee0 MD |
1305 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1306 | const struct lttng_kernel_event_desc *event_desc) | |
1307 | { | |
1308 | struct lttng_kernel_event_common *event; | |
1309 | ||
1310 | mutex_lock(&sessions_mutex); | |
1311 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1312 | mutex_unlock(&sessions_mutex); | |
1313 | return event; | |
1314 | } | |
1315 | ||
99f52fcc FD |
1316 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1317 | const size_t *dim_indexes, int32_t cpu, | |
1318 | int64_t *val, bool *overflow, bool *underflow) | |
1319 | { | |
1320 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1321 | cpu, val, overflow, underflow); | |
1322 | } | |
1323 | ||
1324 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1325 | const size_t *dim_indexes, int64_t *val, | |
1326 | bool *overflow, bool *underflow) | |
1327 | { | |
1328 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1329 | val, overflow, underflow); | |
1330 | } | |
1331 | ||
1332 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1333 | const size_t *dim_indexes) | |
1334 | { | |
1335 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1336 | } | |
1337 | ||
6a338ba4 | 1338 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1339 | static |
0c851fa0 | 1340 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1341 | { |
437d5aa5 | 1342 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1343 | int ret = -EINVAL; |
3c997079 | 1344 | |
6a338ba4 | 1345 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1346 | |
0c851fa0 MD |
1347 | desc = event->priv->desc; |
1348 | switch (event->priv->instrumentation) { | |
606828e4 | 1349 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1350 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1351 | desc->tp_class->probe_callback, |
0c851fa0 | 1352 | event); |
4ecb5ad5 | 1353 | break; |
b4a75708 | 1354 | |
606828e4 | 1355 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1356 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1357 | break; |
b4a75708 | 1358 | |
c190d76e MJ |
1359 | case LTTNG_KERNEL_ABI_KPROBE: |
1360 | lttng_fallthrough; | |
1361 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1362 | ret = 0; |
f0bcc14c | 1363 | break; |
0c851fa0 MD |
1364 | |
1365 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1366 | switch (event->type) { | |
1367 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1368 | ret = 0; | |
1369 | break; | |
1370 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1371 | WARN_ON_ONCE(1); | |
1372 | break; | |
1373 | } | |
4ecb5ad5 | 1374 | break; |
b4a75708 | 1375 | |
c190d76e MJ |
1376 | case LTTNG_KERNEL_ABI_FUNCTION: |
1377 | lttng_fallthrough; | |
1378 | case LTTNG_KERNEL_ABI_NOOP: | |
1379 | lttng_fallthrough; | |
4ecb5ad5 MD |
1380 | default: |
1381 | WARN_ON_ONCE(1); | |
1382 | } | |
6a338ba4 | 1383 | WARN_ON_ONCE(ret); |
3c997079 | 1384 | if (!ret) |
0c851fa0 | 1385 | event->priv->registered = 1; |
3c997079 MD |
1386 | } |
1387 | ||
6a338ba4 MD |
1388 | static |
1389 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1390 | { |
f0bcc14c | 1391 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1392 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1393 | int ret = -EINVAL; |
1394 | ||
6a338ba4 | 1395 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1396 | |
a67ba386 MD |
1397 | desc = event_priv->desc; |
1398 | switch (event_priv->instrumentation) { | |
606828e4 | 1399 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1400 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1401 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1402 | event); |
baf20995 | 1403 | break; |
b4a75708 | 1404 | |
606828e4 | 1405 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1406 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1407 | ret = 0; |
1408 | break; | |
b4a75708 | 1409 | |
606828e4 | 1410 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1411 | switch (event->type) { |
1412 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1413 | lttng_kretprobes_unregister(event); | |
1414 | ret = 0; | |
1415 | break; | |
1416 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1417 | WARN_ON_ONCE(1); | |
1418 | break; | |
1419 | } | |
7371f44c | 1420 | break; |
b4a75708 | 1421 | |
606828e4 | 1422 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1423 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1424 | break; |
b4a75708 | 1425 | |
606828e4 | 1426 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1427 | switch (event->type) { |
1428 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1429 | ret = 0; | |
1430 | break; | |
1431 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1432 | WARN_ON_ONCE(1); | |
1433 | break; | |
1434 | } | |
259b6cb3 | 1435 | break; |
b4a75708 | 1436 | |
606828e4 | 1437 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1438 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1439 | ret = 0; |
1440 | break; | |
b4a75708 | 1441 | |
c190d76e MJ |
1442 | case LTTNG_KERNEL_ABI_FUNCTION: |
1443 | lttng_fallthrough; | |
baf20995 MD |
1444 | default: |
1445 | WARN_ON_ONCE(1); | |
1446 | } | |
6a338ba4 | 1447 | WARN_ON_ONCE(ret); |
3c997079 | 1448 | if (!ret) |
a67ba386 | 1449 | event_priv->registered = 0; |
6a338ba4 MD |
1450 | } |
1451 | ||
1452 | static | |
1453 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1454 | { | |
1455 | if (event->priv->registered) | |
1456 | unregister_event(event); | |
dda6a249 MD |
1457 | } |
1458 | ||
1459 | /* | |
1460 | * Only used internally at session destruction. | |
1461 | */ | |
be066e6c | 1462 | static |
0648898e | 1463 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1464 | { |
0648898e | 1465 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1466 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1467 | ||
0648898e MD |
1468 | lttng_free_event_filter_runtime(event); |
1469 | /* Free event enabler refs */ | |
1470 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1471 | &event_priv->enablers_ref_head, node) | |
1472 | kfree(enabler_ref); | |
b4a75708 | 1473 | |
0648898e MD |
1474 | switch (event->type) { |
1475 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1476 | { | |
1477 | struct lttng_kernel_event_recorder *event_recorder = | |
1478 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1479 | |
0648898e MD |
1480 | switch (event_priv->instrumentation) { |
1481 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1482 | lttng_event_desc_put(event_priv->desc); | |
1483 | break; | |
b4a75708 | 1484 | |
0648898e MD |
1485 | case LTTNG_KERNEL_ABI_KPROBE: |
1486 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1487 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1488 | break; |
b4a75708 | 1489 | |
0648898e MD |
1490 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1491 | module_put(event_priv->desc->owner); | |
eb6b47db | 1492 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1493 | break; |
b4a75708 | 1494 | |
0648898e MD |
1495 | case LTTNG_KERNEL_ABI_SYSCALL: |
1496 | break; | |
4e3c1b9b | 1497 | |
0648898e MD |
1498 | case LTTNG_KERNEL_ABI_UPROBE: |
1499 | module_put(event_priv->desc->owner); | |
17806c46 | 1500 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1501 | break; |
3ef5cc03 | 1502 | |
c190d76e MJ |
1503 | case LTTNG_KERNEL_ABI_FUNCTION: |
1504 | lttng_fallthrough; | |
1505 | case LTTNG_KERNEL_ABI_NOOP: | |
1506 | lttng_fallthrough; | |
0648898e MD |
1507 | default: |
1508 | WARN_ON_ONCE(1); | |
1509 | } | |
f237aef8 | 1510 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1511 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1512 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1513 | break; |
0648898e MD |
1514 | } |
1515 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1516 | { | |
1517 | struct lttng_kernel_event_notifier *event_notifier = | |
1518 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1519 | |
0648898e MD |
1520 | switch (event_notifier->priv->parent.instrumentation) { |
1521 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1522 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1523 | break; | |
b4a75708 | 1524 | |
0648898e MD |
1525 | case LTTNG_KERNEL_ABI_KPROBE: |
1526 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1527 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1528 | break; |
b4a75708 | 1529 | |
0648898e MD |
1530 | case LTTNG_KERNEL_ABI_SYSCALL: |
1531 | break; | |
b4a75708 | 1532 | |
0648898e MD |
1533 | case LTTNG_KERNEL_ABI_UPROBE: |
1534 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1535 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1536 | break; |
1537 | ||
c190d76e MJ |
1538 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1539 | lttng_fallthrough; | |
1540 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1541 | lttng_fallthrough; | |
1542 | case LTTNG_KERNEL_ABI_NOOP: | |
1543 | lttng_fallthrough; | |
0648898e MD |
1544 | default: |
1545 | WARN_ON_ONCE(1); | |
1546 | } | |
f237aef8 | 1547 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1548 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1549 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1550 | break; | |
1551 | } | |
dffef45d FD |
1552 | default: |
1553 | WARN_ON_ONCE(1); | |
1554 | } | |
dffef45d FD |
1555 | } |
1556 | ||
8c0393c3 | 1557 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1558 | enum tracker_type tracker_type) |
e0130fab | 1559 | { |
d1f652f8 MD |
1560 | switch (tracker_type) { |
1561 | case TRACKER_PID: | |
1562 | return &session->pid_tracker; | |
1563 | case TRACKER_VPID: | |
1564 | return &session->vpid_tracker; | |
1565 | case TRACKER_UID: | |
1566 | return &session->uid_tracker; | |
1567 | case TRACKER_VUID: | |
1568 | return &session->vuid_tracker; | |
1569 | case TRACKER_GID: | |
1570 | return &session->gid_tracker; | |
1571 | case TRACKER_VGID: | |
1572 | return &session->vgid_tracker; | |
1573 | default: | |
1574 | WARN_ON_ONCE(1); | |
1575 | return NULL; | |
1576 | } | |
1577 | } | |
1578 | ||
8cdc1a81 | 1579 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1580 | enum tracker_type tracker_type, int id) |
1581 | { | |
8c0393c3 | 1582 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1583 | int ret; |
1584 | ||
d1f652f8 MD |
1585 | tracker = get_tracker(session, tracker_type); |
1586 | if (!tracker) | |
1587 | return -EINVAL; | |
1588 | if (id < -1) | |
e0130fab MD |
1589 | return -EINVAL; |
1590 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1591 | if (id == -1) { |
1592 | /* track all ids: destroy tracker. */ | |
1593 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1594 | ret = 0; |
1595 | } else { | |
d1f652f8 | 1596 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1597 | } |
e0130fab MD |
1598 | mutex_unlock(&sessions_mutex); |
1599 | return ret; | |
1600 | } | |
1601 | ||
8cdc1a81 | 1602 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1603 | enum tracker_type tracker_type, int id) |
e0130fab | 1604 | { |
8c0393c3 | 1605 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1606 | int ret; |
1607 | ||
d1f652f8 MD |
1608 | tracker = get_tracker(session, tracker_type); |
1609 | if (!tracker) | |
1610 | return -EINVAL; | |
1611 | if (id < -1) | |
e0130fab MD |
1612 | return -EINVAL; |
1613 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1614 | if (id == -1) { |
1615 | /* untrack all ids: replace by empty tracker. */ | |
1616 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1617 | } else { |
d1f652f8 | 1618 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1619 | } |
e0130fab MD |
1620 | mutex_unlock(&sessions_mutex); |
1621 | return ret; | |
1622 | } | |
1623 | ||
7e6f9ef6 | 1624 | static |
d1f652f8 | 1625 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1626 | { |
8c0393c3 MD |
1627 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1628 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1629 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1630 | int iter = 0, i; |
1631 | ||
1632 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1633 | if (id_tracker_p) { |
1634 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1635 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1636 | |
f934e302 | 1637 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1638 | if (iter++ >= *pos) |
1639 | return e; | |
1640 | } | |
1641 | } | |
1642 | } else { | |
d1f652f8 | 1643 | /* ID tracker disabled. */ |
7e6f9ef6 | 1644 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1645 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1646 | } |
1647 | iter++; | |
1648 | } | |
1649 | /* End of list */ | |
1650 | return NULL; | |
1651 | } | |
1652 | ||
1653 | /* Called with sessions_mutex held. */ | |
1654 | static | |
d1f652f8 | 1655 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1656 | { |
8c0393c3 MD |
1657 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1658 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1659 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1660 | int iter = 0, i; |
1661 | ||
1662 | (*ppos)++; | |
d1f652f8 MD |
1663 | if (id_tracker_p) { |
1664 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1665 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1666 | |
f934e302 | 1667 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1668 | if (iter++ >= *ppos) |
1669 | return e; | |
1670 | } | |
1671 | } | |
1672 | } else { | |
d1f652f8 | 1673 | /* ID tracker disabled. */ |
7e6f9ef6 | 1674 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1675 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1676 | iter++; |
1677 | } | |
1678 | ||
1679 | /* End of list */ | |
1680 | return NULL; | |
1681 | } | |
1682 | ||
1683 | static | |
d1f652f8 | 1684 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1685 | { |
1686 | mutex_unlock(&sessions_mutex); | |
1687 | } | |
1688 | ||
1689 | static | |
d1f652f8 | 1690 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1691 | { |
8c0393c3 MD |
1692 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1693 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1694 | int id; |
7e6f9ef6 | 1695 | |
d1f652f8 | 1696 | if (p == id_tracker_p) { |
7e6f9ef6 | 1697 | /* Tracker disabled. */ |
d1f652f8 | 1698 | id = -1; |
7e6f9ef6 | 1699 | } else { |
d1f652f8 | 1700 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1701 | |
d1f652f8 MD |
1702 | id = lttng_id_tracker_get_node_id(e); |
1703 | } | |
8c0393c3 | 1704 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1705 | case TRACKER_PID: |
1706 | seq_printf(m, "process { pid = %d; };\n", id); | |
1707 | break; | |
1708 | case TRACKER_VPID: | |
1709 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1710 | break; | |
1711 | case TRACKER_UID: | |
1712 | seq_printf(m, "user { uid = %d; };\n", id); | |
1713 | break; | |
1714 | case TRACKER_VUID: | |
1715 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1716 | break; | |
1717 | case TRACKER_GID: | |
1718 | seq_printf(m, "group { gid = %d; };\n", id); | |
1719 | break; | |
1720 | case TRACKER_VGID: | |
1721 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1722 | break; | |
1723 | default: | |
1724 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1725 | } |
7e6f9ef6 MD |
1726 | return 0; |
1727 | } | |
1728 | ||
1729 | static | |
d1f652f8 MD |
1730 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1731 | .start = id_list_start, | |
1732 | .next = id_list_next, | |
1733 | .stop = id_list_stop, | |
1734 | .show = id_list_show, | |
7e6f9ef6 MD |
1735 | }; |
1736 | ||
1737 | static | |
d1f652f8 | 1738 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1739 | { |
d1f652f8 | 1740 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1741 | } |
1742 | ||
1743 | static | |
d1f652f8 | 1744 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1745 | { |
1746 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1747 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1748 | int ret; |
1749 | ||
d1f652f8 | 1750 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1751 | ret = seq_release(inode, file); |
d1f652f8 | 1752 | if (!ret) |
8c0393c3 | 1753 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1754 | return ret; |
1755 | } | |
1756 | ||
d1f652f8 | 1757 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1758 | .owner = THIS_MODULE, |
d1f652f8 | 1759 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1760 | .read = seq_read, |
1761 | .llseek = seq_lseek, | |
d1f652f8 | 1762 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1763 | }; |
1764 | ||
8cdc1a81 | 1765 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1766 | enum tracker_type tracker_type) |
7e6f9ef6 | 1767 | { |
d1f652f8 | 1768 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1769 | struct seq_file *m; |
1770 | int file_fd, ret; | |
1771 | ||
1772 | file_fd = lttng_get_unused_fd(); | |
1773 | if (file_fd < 0) { | |
1774 | ret = file_fd; | |
1775 | goto fd_error; | |
1776 | } | |
1777 | ||
d1f652f8 MD |
1778 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1779 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1780 | NULL, O_RDWR); |
d1f652f8 MD |
1781 | if (IS_ERR(tracker_ids_list_file)) { |
1782 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1783 | goto file_error; |
1784 | } | |
8cdc1a81 | 1785 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1786 | ret = -EOVERFLOW; |
9c1f4643 MD |
1787 | goto refcount_error; |
1788 | } | |
d1f652f8 | 1789 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1790 | if (ret < 0) |
1791 | goto open_error; | |
d1f652f8 MD |
1792 | m = tracker_ids_list_file->private_data; |
1793 | ||
1794 | m->private = get_tracker(session, tracker_type); | |
1795 | BUG_ON(!m->private); | |
1796 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1797 | |
1798 | return file_fd; | |
1799 | ||
1800 | open_error: | |
8cdc1a81 | 1801 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1802 | refcount_error: |
d1f652f8 | 1803 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1804 | file_error: |
1805 | put_unused_fd(file_fd); | |
1806 | fd_error: | |
1807 | return ret; | |
1808 | } | |
1809 | ||
3c997079 MD |
1810 | /* |
1811 | * Enabler management. | |
1812 | */ | |
1813 | static | |
4993071a PP |
1814 | int lttng_match_enabler_star_glob(const char *desc_name, |
1815 | const char *pattern) | |
3c997079 | 1816 | { |
cbc19040 MD |
1817 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1818 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1819 | return 0; |
1820 | return 1; | |
1821 | } | |
1822 | ||
1823 | static | |
4ecb5ad5 MD |
1824 | int lttng_match_enabler_name(const char *desc_name, |
1825 | const char *name) | |
3c997079 | 1826 | { |
4ecb5ad5 | 1827 | if (strcmp(desc_name, name)) |
3c997079 MD |
1828 | return 0; |
1829 | return 1; | |
1830 | } | |
1831 | ||
8bff0fc3 MD |
1832 | static |
1833 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1834 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1835 | { |
4ecb5ad5 | 1836 | const char *desc_name, *enabler_name; |
badfe9f5 | 1837 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1838 | |
1839 | enabler_name = enabler->event_param.name; | |
1840 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1841 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1842 | desc_name = desc->event_name; |
3b861b22 FD |
1843 | switch (enabler->format_type) { |
1844 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1845 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1846 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1847 | return lttng_match_enabler_name(desc_name, enabler_name); |
1848 | default: | |
1849 | return -EINVAL; | |
1850 | } | |
4ecb5ad5 | 1851 | break; |
b4a75708 | 1852 | |
606828e4 | 1853 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1854 | desc_name = desc->event_name; |
badfe9f5 | 1855 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1856 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1857 | compat = true; |
1858 | } | |
4ecb5ad5 MD |
1859 | if (!strncmp(desc_name, "syscall_exit_", |
1860 | strlen("syscall_exit_"))) { | |
1861 | desc_name += strlen("syscall_exit_"); | |
1862 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1863 | strlen("syscall_entry_"))) { | |
1864 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1865 | entry = true; |
4ecb5ad5 MD |
1866 | } else { |
1867 | WARN_ON_ONCE(1); | |
1868 | return -EINVAL; | |
1869 | } | |
badfe9f5 | 1870 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1871 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1872 | break; |
606828e4 | 1873 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1874 | if (!entry) |
1875 | return 0; | |
1876 | break; | |
606828e4 | 1877 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1878 | if (entry) |
1879 | return 0; | |
1880 | break; | |
1881 | default: | |
1882 | return -EINVAL; | |
1883 | } | |
1884 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1885 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1886 | break; |
606828e4 | 1887 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1888 | if (compat) |
1889 | return 0; | |
1890 | break; | |
606828e4 | 1891 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1892 | if (!compat) |
1893 | return 0; | |
1894 | break; | |
1895 | default: | |
1896 | return -EINVAL; | |
1897 | } | |
1898 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1899 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1900 | switch (enabler->format_type) { |
1901 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1902 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1903 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1904 | return lttng_match_enabler_name(desc_name, enabler_name); |
1905 | default: | |
1906 | return -EINVAL; | |
1907 | } | |
1908 | break; | |
606828e4 | 1909 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1910 | return -EINVAL; /* Not implemented. */ |
1911 | default: | |
1912 | return -EINVAL; | |
1913 | } | |
4ecb5ad5 | 1914 | break; |
b4a75708 | 1915 | |
4ecb5ad5 MD |
1916 | default: |
1917 | WARN_ON_ONCE(1); | |
1918 | return -EINVAL; | |
1919 | } | |
3c997079 MD |
1920 | } |
1921 | ||
8bff0fc3 MD |
1922 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1923 | struct lttng_event_enabler_common *enabler) | |
1924 | { | |
1925 | int ret; | |
1926 | ||
1927 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1928 | if (ret < 0) { | |
1929 | WARN_ON_ONCE(1); | |
1930 | return false; | |
1931 | } | |
1932 | return ret; | |
1933 | } | |
1934 | ||
5c6ec66a MD |
1935 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1936 | struct lttng_kernel_event_common *event) | |
3c997079 | 1937 | { |
5c6ec66a MD |
1938 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1939 | return false; | |
b2bc0bc8 | 1940 | |
5c6ec66a MD |
1941 | switch (event_enabler->enabler_type) { |
1942 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1943 | { | |
1944 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1945 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1946 | struct lttng_kernel_event_recorder *event_recorder = | |
1947 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1948 | ||
1949 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1950 | && event_recorder->chan == event_recorder_enabler->chan) | |
1951 | return true; | |
1952 | else | |
1953 | return false; | |
1954 | } | |
1955 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1956 | { | |
1957 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1958 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1959 | struct lttng_kernel_event_notifier *event_notifier = | |
1960 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1961 | ||
1962 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1963 | && event_notifier->priv->group == event_notifier_enabler->group | |
1964 | && event->priv->user_token == event_enabler->user_token) | |
1965 | return true; | |
1966 | else | |
1967 | return false; | |
1968 | } | |
1969 | default: | |
1970 | WARN_ON_ONCE(1); | |
1971 | return false; | |
1972 | } | |
3c997079 MD |
1973 | } |
1974 | ||
5c6ec66a MD |
1975 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1976 | const struct lttng_kernel_event_desc *desc, | |
1977 | struct lttng_kernel_event_common *event) | |
b01155ba | 1978 | { |
5c6ec66a MD |
1979 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1980 | return false; | |
b01155ba | 1981 | |
5c6ec66a MD |
1982 | switch (event_enabler->enabler_type) { |
1983 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1984 | { | |
1985 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1986 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1987 | struct lttng_kernel_event_recorder *event_recorder = | |
1988 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1989 | ||
1990 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1991 | return true; | |
1992 | else | |
1993 | return false; | |
1994 | } | |
1995 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1996 | { | |
1997 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1998 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1999 | struct lttng_kernel_event_notifier *event_notifier = | |
2000 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2001 | ||
2002 | if (event->priv->desc == desc | |
2003 | && event_notifier->priv->group == event_notifier_enabler->group | |
2004 | && event->priv->user_token == event_enabler->user_token) | |
2005 | return true; | |
2006 | else | |
2007 | return false; | |
2008 | } | |
2009 | default: | |
2010 | WARN_ON_ONCE(1); | |
2011 | return false; | |
2012 | } | |
b01155ba FD |
2013 | } |
2014 | ||
0d223dc6 MD |
2015 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2016 | const char *event_name, | |
2017 | struct lttng_kernel_event_common *event) | |
2018 | { | |
2019 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2020 | return false; | |
2021 | ||
2022 | switch (event_enabler->enabler_type) { | |
2023 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2024 | { | |
2025 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2026 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2027 | struct lttng_kernel_event_recorder *event_recorder = | |
2028 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2029 | ||
2030 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2031 | && event_recorder->chan == event_recorder_enabler->chan) | |
2032 | return true; | |
2033 | else | |
2034 | return false; | |
2035 | } | |
2036 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2037 | { | |
2038 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2039 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2040 | struct lttng_kernel_event_notifier *event_notifier = | |
2041 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2042 | ||
2043 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2044 | && event_notifier->priv->group == event_notifier_enabler->group | |
2045 | && event->priv->user_token == event_enabler->user_token) | |
2046 | return true; | |
2047 | else | |
2048 | return false; | |
2049 | } | |
2050 | default: | |
2051 | WARN_ON_ONCE(1); | |
2052 | return false; | |
2053 | } | |
2054 | } | |
2055 | ||
3c997079 | 2056 | static |
b2bc0bc8 FD |
2057 | struct lttng_enabler_ref *lttng_enabler_ref( |
2058 | struct list_head *enablers_ref_list, | |
8d554755 | 2059 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2060 | { |
2061 | struct lttng_enabler_ref *enabler_ref; | |
2062 | ||
b2bc0bc8 | 2063 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2064 | if (enabler_ref->ref == enabler) |
2065 | return enabler_ref; | |
2066 | } | |
2067 | return NULL; | |
2068 | } | |
2069 | ||
3c997079 | 2070 | static |
b2f63bde | 2071 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2072 | { |
c8e14380 | 2073 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2074 | struct lttng_kernel_probe_desc *probe_desc; |
2075 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2076 | struct list_head *probe_list; |
c8e14380 | 2077 | int i; |
3c997079 MD |
2078 | |
2079 | probe_list = lttng_get_probe_list_head(); | |
2080 | /* | |
2081 | * For each probe event, if we find that a probe event matches | |
2082 | * our enabler, create an associated lttng_event if not | |
2083 | * already present. | |
2084 | */ | |
2085 | list_for_each_entry(probe_desc, probe_list, head) { | |
2086 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2087 | bool found = false; |
3c997079 | 2088 | struct hlist_head *head; |
83006ee0 | 2089 | struct lttng_kernel_event_common *event; |
19bef247 | 2090 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2091 | |
2092 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2093 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2094 | continue; |
3c997079 MD |
2095 | |
2096 | /* | |
2097 | * Check if already created. | |
2098 | */ | |
0def9170 | 2099 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2100 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2101 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2102 | found = true; | |
2103 | break; | |
2104 | } | |
3c997079 MD |
2105 | } |
2106 | if (found) | |
2107 | continue; | |
2108 | ||
2109 | /* | |
83006ee0 | 2110 | * We need to create an event for this event probe. |
3c997079 | 2111 | */ |
c8e14380 | 2112 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2113 | if (IS_ERR(event)) { |
5a15f70c | 2114 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2115 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2116 | } |
2117 | } | |
2118 | } | |
2119 | } | |
2120 | ||
33a39a3c | 2121 | /* |
8839618b | 2122 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2123 | * Should be called with sessions mutex held. |
2124 | */ | |
2125 | static | |
b2f63bde | 2126 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2127 | { |
b2f63bde MD |
2128 | int ret; |
2129 | ||
8839618b | 2130 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2131 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2132 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2133 | break; |
b4a75708 | 2134 | |
606828e4 | 2135 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2136 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2137 | WARN_ON_ONCE(ret); | |
33a39a3c | 2138 | break; |
b4a75708 | 2139 | |
33a39a3c MD |
2140 | default: |
2141 | WARN_ON_ONCE(1); | |
2142 | break; | |
2143 | } | |
2144 | } | |
2145 | ||
d619fae9 MD |
2146 | static |
2147 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2148 | struct lttng_kernel_event_common *event) | |
2149 | { | |
2150 | /* Link filter bytecodes if not linked yet. */ | |
2151 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2152 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2153 | } | |
2154 | ||
1e06b222 MD |
2155 | static |
2156 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2157 | struct lttng_kernel_event_common *event) | |
2158 | { | |
2159 | switch (event_enabler->enabler_type) { | |
2160 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2161 | break; | |
2162 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2163 | { | |
2164 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2165 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2166 | struct lttng_kernel_event_notifier *event_notifier = | |
2167 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2168 | ||
2169 | /* Link capture bytecodes if not linked yet. */ | |
2170 | lttng_enabler_link_bytecode(event->priv->desc, | |
2171 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2172 | &event_notifier_enabler->capture_bytecode_head); | |
2173 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2174 | break; | |
2175 | } | |
2176 | default: | |
2177 | WARN_ON_ONCE(1); | |
2178 | } | |
2179 | } | |
2180 | ||
3c997079 | 2181 | /* |
b2bc0bc8 | 2182 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2183 | * and add backward reference from the event to the enabler. |
2184 | * Should be called with sessions mutex held. | |
2185 | */ | |
2186 | static | |
3622cd47 | 2187 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2188 | { |
3622cd47 MD |
2189 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2190 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2191 | |
3622cd47 | 2192 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2193 | |
3c997079 | 2194 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2195 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2196 | |
3622cd47 MD |
2197 | /* Link the created event with its associated enabler. */ |
2198 | list_for_each_entry(event_priv, event_list_head, node) { | |
2199 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2200 | struct lttng_enabler_ref *enabler_ref; |
2201 | ||
3622cd47 | 2202 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2203 | continue; |
2204 | ||
3622cd47 | 2205 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2206 | if (!enabler_ref) { |
2207 | /* | |
2208 | * If no backward ref, create it. | |
2209 | * Add backward ref from event_notifier to enabler. | |
2210 | */ | |
2211 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2212 | if (!enabler_ref) | |
2213 | return -ENOMEM; | |
2214 | ||
3622cd47 MD |
2215 | enabler_ref->ref = event_enabler; |
2216 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2217 | } |
2218 | ||
3622cd47 MD |
2219 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2220 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2221 | } |
2222 | return 0; | |
2223 | } | |
2224 | ||
3c997079 MD |
2225 | /* |
2226 | * Called at module load: connect the probe on all enablers matching | |
2227 | * this event. | |
2228 | * Called with sessions lock held. | |
2229 | */ | |
2230 | int lttng_fix_pending_events(void) | |
2231 | { | |
8cdc1a81 | 2232 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2233 | |
8cdc1a81 MD |
2234 | list_for_each_entry(session_priv, &sessions, list) |
2235 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2236 | return 0; |
2237 | } | |
2238 | ||
b01155ba FD |
2239 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2240 | struct lttng_event_notifier_group *event_notifier_group) | |
2241 | { | |
09710b83 | 2242 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2243 | |
09710b83 MD |
2244 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2245 | if (event_enabler->enabled) | |
b01155ba FD |
2246 | return true; |
2247 | } | |
2248 | return false; | |
2249 | } | |
2250 | ||
2251 | bool lttng_event_notifier_active(void) | |
2252 | { | |
2253 | struct lttng_event_notifier_group *event_notifier_group; | |
2254 | ||
2255 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2256 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2257 | return true; | |
2258 | } | |
2259 | return false; | |
2260 | } | |
2261 | ||
2262 | int lttng_fix_pending_event_notifiers(void) | |
2263 | { | |
2264 | struct lttng_event_notifier_group *event_notifier_group; | |
2265 | ||
2266 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2267 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2268 | return 0; | |
2269 | } | |
2270 | ||
1ae083ba | 2271 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2272 | enum lttng_enabler_format_type format_type, |
606828e4 | 2273 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2274 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2275 | { |
1ae083ba | 2276 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2277 | |
b2bc0bc8 FD |
2278 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2279 | if (!event_enabler) | |
3c997079 | 2280 | return NULL; |
0bb716a8 | 2281 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2282 | event_enabler->parent.format_type = format_type; |
2283 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2284 | memcpy(&event_enabler->parent.event_param, event_param, | |
2285 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2286 | event_enabler->chan = chan; |
3c997079 | 2287 | /* ctx left NULL */ |
5b9817ae | 2288 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2289 | return event_enabler; |
2290 | } | |
2291 | ||
2292 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2293 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2294 | { |
3c997079 | 2295 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2296 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2297 | event_enabler->parent.published = true; | |
def1e304 | 2298 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2299 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2300 | } |
2301 | ||
7b25ab0e | 2302 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2303 | { |
2304 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2305 | event_enabler->enabled = 1; |
2306 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2307 | mutex_unlock(&sessions_mutex); |
2308 | return 0; | |
2309 | } | |
2310 | ||
7b25ab0e | 2311 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2312 | { |
2313 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2314 | event_enabler->enabled = 0; |
2315 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2316 | mutex_unlock(&sessions_mutex); |
2317 | return 0; | |
2318 | } | |
2319 | ||
b2bc0bc8 | 2320 | static |
8d554755 | 2321 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2322 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2323 | { |
d64ca521 | 2324 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2325 | uint32_t bytecode_len; |
2326 | int ret; | |
2327 | ||
2328 | ret = get_user(bytecode_len, &bytecode->len); | |
2329 | if (ret) | |
2330 | return ret; | |
52cfcdf3 | 2331 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2332 | GFP_KERNEL); |
2333 | if (!bytecode_node) | |
2334 | return -ENOMEM; | |
2335 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2336 | sizeof(*bytecode) + bytecode_len); | |
2337 | if (ret) | |
2338 | goto error_free; | |
b2bc0bc8 | 2339 | |
8a445457 | 2340 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2341 | bytecode_node->enabler = enabler; |
2342 | /* Enforce length based on allocated size */ | |
2343 | bytecode_node->bc.len = bytecode_len; | |
2344 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2345 | |
07dfc1d0 MD |
2346 | return 0; |
2347 | ||
2348 | error_free: | |
52cfcdf3 | 2349 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2350 | return ret; |
2351 | } | |
2352 | ||
6048044f | 2353 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2354 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2355 | { |
2356 | int ret; | |
6048044f | 2357 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2358 | if (ret) |
2359 | goto error; | |
7b25ab0e | 2360 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2361 | return 0; |
2362 | ||
2363 | error: | |
2364 | return ret; | |
2365 | } | |
2366 | ||
e2d5dbc7 | 2367 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2368 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2369 | { |
2370 | ||
e2d5dbc7 | 2371 | switch (event->priv->instrumentation) { |
606828e4 | 2372 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2373 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2374 | default: |
2375 | return -EINVAL; | |
2376 | } | |
2377 | } | |
2378 | ||
3c997079 | 2379 | static |
8d554755 | 2380 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2381 | { |
d64ca521 | 2382 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2383 | |
2384 | /* Destroy filter bytecode */ | |
2385 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2386 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2387 | lttng_kvfree(filter_node); |
07dfc1d0 | 2388 | } |
b2bc0bc8 FD |
2389 | } |
2390 | ||
44b1abdc | 2391 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2392 | { |
09710b83 MD |
2393 | lttng_enabler_destroy(event_enabler); |
2394 | if (event_enabler->published) | |
2395 | list_del(&event_enabler->node); | |
2396 | ||
44b1abdc MD |
2397 | switch (event_enabler->enabler_type) { |
2398 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2399 | { | |
2400 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2401 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2402 | ||
44b1abdc MD |
2403 | kfree(event_recorder_enabler); |
2404 | break; | |
2405 | } | |
2406 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2407 | { | |
2408 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2409 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2410 | |
44b1abdc MD |
2411 | kfree(event_notifier_enabler); |
2412 | break; | |
2413 | } | |
2414 | default: | |
2415 | WARN_ON_ONCE(1); | |
2416 | } | |
3c997079 MD |
2417 | } |
2418 | ||
dffef45d | 2419 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2420 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2421 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2422 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2423 | { |
2424 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2425 | ||
2426 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2427 | if (!event_notifier_enabler) | |
2428 | return NULL; | |
2429 | ||
0bb716a8 | 2430 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2431 | event_notifier_enabler->parent.format_type = format_type; |
2432 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2433 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2434 | ||
99f52fcc | 2435 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2436 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2437 | |
5b9817ae MD |
2438 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2439 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2440 | |
5b9817ae MD |
2441 | event_notifier_enabler->parent.enabled = 0; |
2442 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2443 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2444 | return event_notifier_enabler; |
2445 | } | |
dffef45d | 2446 | |
1bbb5b2d MD |
2447 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2448 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2449 | { | |
dffef45d | 2450 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2451 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2452 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2453 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2454 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2455 | } |
2456 | ||
2457 | int lttng_event_notifier_enabler_enable( | |
2458 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2459 | { | |
2460 | mutex_lock(&sessions_mutex); | |
2461 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2462 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2463 | mutex_unlock(&sessions_mutex); |
2464 | return 0; | |
2465 | } | |
2466 | ||
2467 | int lttng_event_notifier_enabler_disable( | |
2468 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2469 | { | |
2470 | mutex_lock(&sessions_mutex); | |
2471 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2472 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2473 | mutex_unlock(&sessions_mutex); |
2474 | return 0; | |
2475 | } | |
2476 | ||
99d223ad FD |
2477 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2478 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2479 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2480 | { |
d64ca521 | 2481 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2482 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2483 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2484 | uint32_t bytecode_len; | |
2485 | int ret; | |
2486 | ||
2487 | ret = get_user(bytecode_len, &bytecode->len); | |
2488 | if (ret) | |
2489 | return ret; | |
2490 | ||
2491 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2492 | GFP_KERNEL); | |
2493 | if (!bytecode_node) | |
2494 | return -ENOMEM; | |
2495 | ||
2496 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2497 | sizeof(*bytecode) + bytecode_len); | |
2498 | if (ret) | |
2499 | goto error_free; | |
2500 | ||
8a445457 | 2501 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2502 | bytecode_node->enabler = enabler; |
2503 | ||
2504 | /* Enforce length based on allocated size */ | |
2505 | bytecode_node->bc.len = bytecode_len; | |
2506 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2507 | ||
2508 | event_notifier_enabler->num_captures++; | |
2509 | ||
2510 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2511 | goto end; | |
2512 | ||
2513 | error_free: | |
2514 | lttng_kvfree(bytecode_node); | |
2515 | end: | |
2516 | return ret; | |
2517 | } | |
2518 | ||
cc5719b1 MD |
2519 | static |
2520 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2521 | { | |
2522 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2523 | struct lttng_kernel_bytecode_runtime *runtime; | |
2524 | struct lttng_enabler_ref *enabler_ref; | |
2525 | ||
2526 | /* Check if has enablers without bytecode enabled */ | |
2527 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2528 | if (enabler_ref->ref->enabled | |
2529 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2530 | has_enablers_without_filter_bytecode = 1; | |
2531 | break; | |
2532 | } | |
2533 | } | |
2534 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2535 | ||
2536 | /* Enable filters */ | |
2537 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2538 | lttng_bytecode_sync_state(runtime); | |
2539 | nr_filters++; | |
2540 | } | |
2541 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2542 | } | |
2543 | ||
2544 | static | |
2545 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2546 | { | |
2547 | switch (event->type) { | |
2548 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2549 | break; | |
2550 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2551 | { | |
2552 | struct lttng_kernel_event_notifier *event_notifier = | |
2553 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2554 | struct lttng_kernel_bytecode_runtime *runtime; | |
2555 | int nr_captures = 0; | |
2556 | ||
2557 | /* Enable captures */ | |
2558 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2559 | lttng_bytecode_sync_state(runtime); | |
2560 | nr_captures++; | |
2561 | } | |
2562 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2563 | break; | |
2564 | } | |
2565 | default: | |
2566 | WARN_ON_ONCE(1); | |
2567 | } | |
2568 | } | |
2569 | ||
a0c6ad2e MD |
2570 | static |
2571 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2572 | { | |
2573 | struct lttng_enabler_ref *enabler_ref; | |
2574 | bool enabled = false; | |
2575 | ||
2576 | switch (event->priv->instrumentation) { | |
2577 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2578 | lttng_fallthrough; | |
2579 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2580 | /* Enable events */ | |
2581 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2582 | if (enabler_ref->ref->enabled) { | |
2583 | enabled = true; | |
2584 | break; | |
2585 | } | |
2586 | } | |
2587 | break; | |
2588 | default: | |
2589 | WARN_ON_ONCE(1); | |
2590 | return false; | |
2591 | } | |
2592 | ||
2593 | switch (event->type) { | |
2594 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2595 | { | |
2596 | struct lttng_kernel_event_recorder *event_recorder = | |
2597 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2598 | ||
2599 | /* | |
2600 | * Enabled state is based on union of enablers, with | |
2601 | * intersection of session and channel transient enable | |
2602 | * states. | |
2603 | */ | |
2604 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2605 | } | |
2606 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2607 | return enabled; | |
2608 | default: | |
2609 | WARN_ON_ONCE(1); | |
2610 | return false; | |
2611 | } | |
2612 | } | |
2613 | ||
2614 | static | |
2615 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2616 | { | |
2617 | switch (event->priv->instrumentation) { | |
2618 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2619 | lttng_fallthrough; | |
2620 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2621 | return true; | |
2622 | ||
2623 | default: | |
2624 | /* Not handled with lazy sync. */ | |
2625 | return false; | |
2626 | } | |
2627 | } | |
2628 | ||
3c997079 | 2629 | /* |
3c997079 MD |
2630 | * Should be called with sessions mutex held. |
2631 | */ | |
2632 | static | |
a0c6ad2e MD |
2633 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2634 | struct list_head *event_list) | |
3c997079 | 2635 | { |
a0c6ad2e | 2636 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2637 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2638 | |
a0c6ad2e | 2639 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2640 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2641 | |
3c997079 MD |
2642 | /* |
2643 | * For each event, if at least one of its enablers is enabled, | |
2644 | * and its channel and session transient states are enabled, we | |
2645 | * enable the event, else we disable it. | |
2646 | */ | |
a0c6ad2e MD |
2647 | list_for_each_entry(event_priv, event_list, node) { |
2648 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2649 | bool enabled; | |
b4a75708 | 2650 | |
a0c6ad2e | 2651 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2652 | continue; |
3c997079 | 2653 | |
a0c6ad2e MD |
2654 | enabled = lttng_get_event_enabled_state(event); |
2655 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2656 | /* |
a0c6ad2e | 2657 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2658 | */ |
2659 | if (enabled) { | |
6a338ba4 MD |
2660 | if (!event_priv->registered) |
2661 | register_event(event); | |
3c997079 | 2662 | } else { |
6a338ba4 MD |
2663 | if (event_priv->registered) |
2664 | unregister_event(event); | |
3c997079 | 2665 | } |
07dfc1d0 | 2666 | |
a0c6ad2e MD |
2667 | lttng_event_sync_filter_state(event); |
2668 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2669 | } |
2670 | } | |
2671 | ||
a0c6ad2e MD |
2672 | /* |
2673 | * lttng_session_sync_event_enablers should be called just before starting a | |
2674 | * session. | |
2675 | */ | |
2676 | static | |
2677 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2678 | { | |
2679 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2680 | } | |
2681 | ||
3c997079 MD |
2682 | /* |
2683 | * Apply enablers to session events, adding events to session if need | |
2684 | * be. It is required after each modification applied to an active | |
2685 | * session, and right before session "start". | |
2686 | * "lazy" sync means we only sync if required. | |
2687 | * Should be called with sessions mutex held. | |
2688 | */ | |
2689 | static | |
8cdc1a81 | 2690 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2691 | { |
2692 | /* We can skip if session is not active */ | |
2693 | if (!session->active) | |
2694 | return; | |
b2bc0bc8 | 2695 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2696 | } |
2697 | ||
b01155ba FD |
2698 | static |
2699 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2700 | { | |
a0c6ad2e | 2701 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2702 | } |
2703 | ||
7b25ab0e MD |
2704 | static |
2705 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2706 | { | |
2707 | switch (event_enabler->enabler_type) { | |
2708 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2709 | { | |
2710 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2711 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2712 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2713 | break; | |
2714 | } | |
2715 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2716 | { | |
2717 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2718 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2719 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2720 | break; | |
2721 | } | |
2722 | default: | |
2723 | WARN_ON_ONCE(1); | |
2724 | } | |
2725 | } | |
2726 | ||
1ec3f75a | 2727 | /* |
d83004aa JD |
2728 | * Serialize at most one packet worth of metadata into a metadata |
2729 | * channel. | |
92d9f5e6 MD |
2730 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2731 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2732 | * allows us to do racy operations such as looking for remaining space left in | |
2733 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2734 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2735 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2736 | * Returns the number of bytes written in the channel, 0 if no data |
2737 | * was written and a negative value on error. | |
1ec3f75a | 2738 | */ |
b3b8072b | 2739 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2740 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2741 | { |
8a57ec02 | 2742 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2743 | int ret = 0; |
2744 | size_t len, reserve_len; | |
2745 | ||
f613e3e6 | 2746 | /* |
92d9f5e6 MD |
2747 | * Ensure we support mutiple get_next / put sequences followed by |
2748 | * put_next. The metadata cache lock protects reading the metadata | |
2749 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2750 | * "flush" operations on the buffer invoked by different processes. | |
2751 | * Moreover, since the metadata cache memory can be reallocated, we | |
2752 | * need to have exclusive access against updates even though we only | |
2753 | * read it. | |
f613e3e6 | 2754 | */ |
92d9f5e6 | 2755 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2756 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2757 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2758 | goto end; |
f613e3e6 | 2759 | |
9616f0bf JD |
2760 | /* Metadata regenerated, change the version. */ |
2761 | if (stream->metadata_cache->version != stream->version) | |
2762 | stream->version = stream->metadata_cache->version; | |
2763 | ||
d83004aa | 2764 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2765 | stream->metadata_in; |
9de2c215 | 2766 | if (!len) |
de23d59d | 2767 | goto end; |
d83004aa | 2768 | reserve_len = min_t(size_t, |
4a399b76 | 2769 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2770 | len); |
a775608d | 2771 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2772 | sizeof(char), NULL); |
d83004aa JD |
2773 | /* |
2774 | * If reservation failed, return an error to the caller. | |
2775 | */ | |
c2fb9c1c | 2776 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2777 | if (ret != 0) { |
2778 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2779 | stream->coherent = false; |
d83004aa JD |
2780 | goto end; |
2781 | } | |
b3b8072b | 2782 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2783 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2784 | reserve_len, 1); |
b3b8072b | 2785 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2786 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2787 | if (reserve_len < len) |
8b97fd42 MD |
2788 | stream->coherent = false; |
2789 | else | |
2790 | stream->coherent = true; | |
d83004aa JD |
2791 | ret = reserve_len; |
2792 | ||
2793 | end: | |
8b97fd42 MD |
2794 | if (coherent) |
2795 | *coherent = stream->coherent; | |
92d9f5e6 | 2796 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2797 | return ret; |
2798 | } | |
2799 | ||
8b97fd42 | 2800 | static |
8cdc1a81 | 2801 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2802 | { |
8cdc1a81 MD |
2803 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2804 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2805 | } |
2806 | ||
2807 | static | |
8cdc1a81 | 2808 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2809 | { |
8cdc1a81 MD |
2810 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2811 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2812 | struct lttng_metadata_stream *stream; |
2813 | ||
8cdc1a81 | 2814 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2815 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2816 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2817 | } |
8b97fd42 MD |
2818 | } |
2819 | ||
d83004aa JD |
2820 | /* |
2821 | * Write the metadata to the metadata cache. | |
2822 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2823 | * The metadata cache lock protects us from concurrent read access from |
2824 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2825 | * The content of the printf is printed as a single atomic metadata |
2826 | * transaction. | |
d83004aa | 2827 | */ |
8cdc1a81 | 2828 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2829 | const char *fmt, ...) |
2830 | { | |
c099397a | 2831 | char *str; |
d83004aa | 2832 | size_t len; |
c099397a MD |
2833 | va_list ap; |
2834 | ||
585e5dcc | 2835 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2836 | |
2837 | va_start(ap, fmt); | |
2838 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2839 | va_end(ap); | |
2840 | if (!str) | |
2841 | return -ENOMEM; | |
2842 | ||
1ec3f75a | 2843 | len = strlen(str); |
8cdc1a81 MD |
2844 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2845 | if (session->priv->metadata_cache->metadata_written + len > | |
2846 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2847 | char *tmp_cache_realloc; |
2848 | unsigned int tmp_cache_alloc_size; | |
2849 | ||
2850 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2851 | session->priv->metadata_cache->cache_alloc + len, |
2852 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2853 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2854 | if (!tmp_cache_realloc) |
2855 | goto err; | |
8cdc1a81 | 2856 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2857 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2858 | session->priv->metadata_cache->data, |
2859 | session->priv->metadata_cache->cache_alloc); | |
2860 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2861 | } |
2862 | ||
8cdc1a81 MD |
2863 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2864 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2865 | } |
8cdc1a81 MD |
2866 | memcpy(session->priv->metadata_cache->data + |
2867 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2868 | str, len); |
8cdc1a81 | 2869 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2870 | kfree(str); |
d83004aa | 2871 | |
d83004aa JD |
2872 | return 0; |
2873 | ||
2874 | err: | |
2875 | kfree(str); | |
2876 | return -ENOMEM; | |
c099397a MD |
2877 | } |
2878 | ||
f513b2bf | 2879 | static |
8cdc1a81 | 2880 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2881 | { |
2882 | size_t i; | |
2883 | ||
2884 | for (i = 0; i < nesting; i++) { | |
2885 | int ret; | |
2886 | ||
2887 | ret = lttng_metadata_printf(session, " "); | |
2888 | if (ret) { | |
2889 | return ret; | |
2890 | } | |
2891 | } | |
2892 | return 0; | |
2893 | } | |
2894 | ||
ceabb767 | 2895 | static |
8cdc1a81 | 2896 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2897 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2898 | size_t nesting) |
2899 | { | |
2900 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2901 | } | |
2902 | ||
2903 | static | |
8cdc1a81 | 2904 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2905 | const struct lttng_kernel_type_integer *type, |
2906 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2907 | size_t nesting) |
2908 | { | |
2909 | int ret; | |
2910 | ||
ceabb767 MD |
2911 | ret = print_tabs(session, nesting); |
2912 | if (ret) | |
2913 | return ret; | |
2914 | ret = lttng_metadata_printf(session, | |
2915 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2916 | type->size, |
2917 | type->alignment, | |
2918 | type->signedness, | |
2919 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2920 | ? "none" |
437d5aa5 | 2921 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2922 | ? "UTF8" |
2923 | : "ASCII", | |
437d5aa5 | 2924 | type->base, |
ceabb767 | 2925 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2926 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2927 | #else |
437d5aa5 | 2928 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2929 | #endif |
2930 | ); | |
2931 | return ret; | |
2932 | } | |
2933 | ||
f513b2bf MD |
2934 | /* |
2935 | * Must be called with sessions_mutex held. | |
2936 | */ | |
2937 | static | |
8cdc1a81 | 2938 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2939 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2940 | size_t nesting) |
2941 | { | |
51ef4536 | 2942 | const char *prev_field_name = NULL; |
f513b2bf MD |
2943 | int ret; |
2944 | uint32_t i, nr_fields; | |
ceabb767 MD |
2945 | unsigned int alignment; |
2946 | ||
f513b2bf MD |
2947 | ret = print_tabs(session, nesting); |
2948 | if (ret) | |
2949 | return ret; | |
2950 | ret = lttng_metadata_printf(session, | |
2951 | "struct {\n"); | |
2952 | if (ret) | |
2953 | return ret; | |
437d5aa5 | 2954 | nr_fields = type->nr_fields; |
f513b2bf | 2955 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2956 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2957 | |
437d5aa5 | 2958 | iter_field = type->fields[i]; |
51ef4536 | 2959 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2960 | if (ret) |
2961 | return ret; | |
2962 | } | |
2963 | ret = print_tabs(session, nesting); | |
2964 | if (ret) | |
2965 | return ret; | |
437d5aa5 | 2966 | alignment = type->alignment; |
ceabb767 MD |
2967 | if (alignment) { |
2968 | ret = lttng_metadata_printf(session, | |
2969 | "} align(%u)", | |
2970 | alignment); | |
2971 | } else { | |
2972 | ret = lttng_metadata_printf(session, | |
2973 | "}"); | |
2974 | } | |
f513b2bf MD |
2975 | return ret; |
2976 | } | |
2977 | ||
2978 | /* | |
2979 | * Must be called with sessions_mutex held. | |
2980 | */ | |
2981 | static | |
8cdc1a81 | 2982 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2983 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2984 | size_t nesting) |
2985 | { | |
2986 | int ret; | |
2987 | ||
2988 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2989 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2990 | if (ret) |
2991 | return ret; | |
ceabb767 | 2992 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2993 | } |
2994 | ||
65c85aa6 MD |
2995 | /* |
2996 | * Must be called with sessions_mutex held. | |
2997 | */ | |
2998 | static | |
8cdc1a81 | 2999 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3000 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3001 | size_t nesting, |
3002 | const char *prev_field_name) | |
65c85aa6 | 3003 | { |
51ef4536 | 3004 | const char *tag_name; |
65c85aa6 MD |
3005 | int ret; |
3006 | uint32_t i, nr_choices; | |
3007 | ||
51ef4536 MD |
3008 | tag_name = type->tag_name; |
3009 | if (!tag_name) | |
3010 | tag_name = prev_field_name; | |
3011 | if (!tag_name) | |
3012 | return -EINVAL; | |
ceabb767 MD |
3013 | /* |
3014 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3015 | */ | |
437d5aa5 | 3016 | if (type->alignment != 0) |
ceabb767 | 3017 | return -EINVAL; |
65c85aa6 MD |
3018 | ret = print_tabs(session, nesting); |
3019 | if (ret) | |
3020 | return ret; | |
3021 | ret = lttng_metadata_printf(session, | |
3022 | "variant <_%s> {\n", | |
51ef4536 | 3023 | tag_name); |
65c85aa6 MD |
3024 | if (ret) |
3025 | return ret; | |
437d5aa5 | 3026 | nr_choices = type->nr_choices; |
65c85aa6 | 3027 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3028 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3029 | |
437d5aa5 | 3030 | iter_field = type->choices[i]; |
51ef4536 | 3031 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3032 | if (ret) |
3033 | return ret; | |
3034 | } | |
3035 | ret = print_tabs(session, nesting); | |
3036 | if (ret) | |
3037 | return ret; | |
3038 | ret = lttng_metadata_printf(session, | |
3039 | "}"); | |
3040 | return ret; | |
3041 | } | |
3042 | ||
3043 | /* | |
3044 | * Must be called with sessions_mutex held. | |
3045 | */ | |
3046 | static | |
8cdc1a81 | 3047 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3048 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3049 | size_t nesting, |
3050 | const char *prev_field_name) | |
65c85aa6 MD |
3051 | { |
3052 | int ret; | |
3053 | ||
3054 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3055 | lttng_kernel_get_type_variant(field->type), nesting, |
3056 | prev_field_name); | |
65c85aa6 MD |
3057 | if (ret) |
3058 | return ret; | |
ceabb767 | 3059 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3060 | } |
3061 | ||
f513b2bf MD |
3062 | /* |
3063 | * Must be called with sessions_mutex held. | |
3064 | */ | |
3065 | static | |
8cdc1a81 | 3066 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3067 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3068 | size_t nesting) |
3069 | { | |
3070 | int ret; | |
437d5aa5 MD |
3071 | const struct lttng_kernel_type_array *array_type; |
3072 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3073 | |
437d5aa5 MD |
3074 | array_type = lttng_kernel_get_type_array(field->type); |
3075 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3076 | |
437d5aa5 | 3077 | if (array_type->alignment) { |
ceabb767 | 3078 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3079 | if (ret) |
3080 | return ret; | |
ceabb767 MD |
3081 | ret = lttng_metadata_printf(session, |
3082 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3083 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3084 | field->name); |
3085 | if (ret) | |
3086 | return ret; | |
3087 | } | |
3088 | /* | |
3089 | * Nested compound types: Only array of structures and variants are | |
3090 | * currently supported. | |
3091 | */ | |
437d5aa5 | 3092 | elem_type = array_type->elem_type; |
12bb2edb MD |
3093 | switch (elem_type->type) { |
3094 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3095 | case lttng_kernel_type_struct: |
3096 | case lttng_kernel_type_variant: | |
3097 | ret = _lttng_type_statedump(session, elem_type, | |
3098 | array_type->encoding, nesting); | |
65c85aa6 MD |
3099 | if (ret) |
3100 | return ret; | |
3101 | break; | |
ceabb767 | 3102 | |
f513b2bf MD |
3103 | default: |
3104 | return -EINVAL; | |
3105 | } | |
3106 | ret = lttng_metadata_printf(session, | |
3107 | " _%s[%u];\n", | |
3108 | field->name, | |
437d5aa5 | 3109 | array_type->length); |
f513b2bf MD |
3110 | return ret; |
3111 | } | |
3112 | ||
3113 | /* | |
3114 | * Must be called with sessions_mutex held. | |
3115 | */ | |
3116 | static | |
8cdc1a81 | 3117 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3118 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3119 | size_t nesting, |
3120 | const char *prev_field_name) | |
f513b2bf MD |
3121 | { |
3122 | int ret; | |
3123 | const char *length_name; | |
437d5aa5 MD |
3124 | const struct lttng_kernel_type_sequence *sequence_type; |
3125 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3126 | |
437d5aa5 MD |
3127 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3128 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3129 | |
437d5aa5 | 3130 | length_name = sequence_type->length_name; |
51ef4536 MD |
3131 | if (!length_name) |
3132 | length_name = prev_field_name; | |
3133 | if (!length_name) | |
3134 | return -EINVAL; | |
ceabb767 | 3135 | |
437d5aa5 | 3136 | if (sequence_type->alignment) { |
ceabb767 | 3137 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3138 | if (ret) |
3139 | return ret; | |
ceabb767 MD |
3140 | ret = lttng_metadata_printf(session, |
3141 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3142 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3143 | field->name); |
3144 | if (ret) | |
3145 | return ret; | |
3146 | } | |
3147 | ||
3148 | /* | |
3149 | * Nested compound types: Only array of structures and variants are | |
3150 | * currently supported. | |
3151 | */ | |
437d5aa5 | 3152 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3153 | switch (elem_type->type) { |
3154 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3155 | case lttng_kernel_type_struct: |
3156 | case lttng_kernel_type_variant: | |
3157 | ret = _lttng_type_statedump(session, elem_type, | |
3158 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3159 | if (ret) |
3160 | return ret; | |
3161 | break; | |
ceabb767 | 3162 | |
f513b2bf MD |
3163 | default: |
3164 | return -EINVAL; | |
3165 | } | |
3166 | ret = lttng_metadata_printf(session, | |
3167 | " _%s[ _%s ];\n", | |
3168 | field->name, | |
51ef4536 | 3169 | length_name); |
f513b2bf MD |
3170 | return ret; |
3171 | } | |
3172 | ||
141ddf28 MD |
3173 | /* |
3174 | * Must be called with sessions_mutex held. | |
3175 | */ | |
3176 | static | |
8cdc1a81 | 3177 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3178 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3179 | size_t nesting) |
3180 | { | |
d96a4a7a | 3181 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3182 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3183 | int ret; |
3184 | unsigned int i, nr_entries; | |
3185 | ||
437d5aa5 | 3186 | container_type = type->container_type; |
12bb2edb | 3187 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3188 | ret = -EINVAL; |
3189 | goto end; | |
3190 | } | |
437d5aa5 | 3191 | enum_desc = type->desc; |
141ddf28 MD |
3192 | nr_entries = enum_desc->nr_entries; |
3193 | ||
3194 | ret = print_tabs(session, nesting); | |
3195 | if (ret) | |
3196 | goto end; | |
ceabb767 MD |
3197 | ret = lttng_metadata_printf(session, "enum : "); |
3198 | if (ret) | |
3199 | goto end; | |
437d5aa5 MD |
3200 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3201 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3202 | if (ret) |
ceabb767 MD |
3203 | goto end; |
3204 | ret = lttng_metadata_printf(session, " {\n"); | |
3205 | if (ret) | |
3206 | goto end; | |
141ddf28 MD |
3207 | /* Dump all entries */ |
3208 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3209 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3210 | int j, len; |
3211 | ||
3212 | ret = print_tabs(session, nesting + 1); | |
3213 | if (ret) | |
3214 | goto end; | |
3215 | ret = lttng_metadata_printf(session, | |
3216 | "\""); | |
3217 | if (ret) | |
3218 | goto end; | |
3219 | len = strlen(entry->string); | |
3220 | /* Escape the character '"' */ | |
3221 | for (j = 0; j < len; j++) { | |
3222 | char c = entry->string[j]; | |
3223 | ||
3224 | switch (c) { | |
3225 | case '"': | |
3226 | ret = lttng_metadata_printf(session, | |
3227 | "\\\""); | |
3228 | break; | |
3229 | case '\\': | |
3230 | ret = lttng_metadata_printf(session, | |
3231 | "\\\\"); | |
3232 | break; | |
3233 | default: | |
3234 | ret = lttng_metadata_printf(session, | |
3235 | "%c", c); | |
3236 | break; | |
3237 | } | |
3238 | if (ret) | |
3239 | goto end; | |
3240 | } | |
08ad1061 PP |
3241 | ret = lttng_metadata_printf(session, "\""); |
3242 | if (ret) | |
3243 | goto end; | |
3244 | ||
3245 | if (entry->options.is_auto) { | |
3246 | ret = lttng_metadata_printf(session, ",\n"); | |
3247 | if (ret) | |
3248 | goto end; | |
141ddf28 | 3249 | } else { |
7c559490 MD |
3250 | ret = lttng_metadata_printf(session, |
3251 | " = "); | |
3252 | if (ret) | |
3253 | goto end; | |
3254 | if (entry->start.signedness) | |
141ddf28 | 3255 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3256 | "%lld", (long long) entry->start.value); |
3257 | else | |
3258 | ret = lttng_metadata_printf(session, | |
3259 | "%llu", entry->start.value); | |
3260 | if (ret) | |
3261 | goto end; | |
3262 | if (entry->start.signedness == entry->end.signedness && | |
3263 | entry->start.value | |
3264 | == entry->end.value) { | |
141ddf28 | 3265 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3266 | ",\n"); |
3267 | } else { | |
3268 | if (entry->end.signedness) { | |
3269 | ret = lttng_metadata_printf(session, | |
3270 | " ... %lld,\n", | |
3271 | (long long) entry->end.value); | |
3272 | } else { | |
3273 | ret = lttng_metadata_printf(session, | |
3274 | " ... %llu,\n", | |
3275 | entry->end.value); | |
3276 | } | |
141ddf28 | 3277 | } |
7c559490 MD |
3278 | if (ret) |
3279 | goto end; | |
141ddf28 | 3280 | } |
141ddf28 MD |
3281 | } |
3282 | ret = print_tabs(session, nesting); | |
3283 | if (ret) | |
3284 | goto end; | |
ceabb767 | 3285 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3286 | end: |
3287 | return ret; | |
3288 | } | |
3289 | ||
d83004aa JD |
3290 | /* |
3291 | * Must be called with sessions_mutex held. | |
3292 | */ | |
c099397a | 3293 | static |
8cdc1a81 | 3294 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3295 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3296 | size_t nesting) |
3297 | { | |
3298 | int ret; | |
437d5aa5 | 3299 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3300 | |
437d5aa5 MD |
3301 | enum_type = lttng_kernel_get_type_enum(field->type); |
3302 | WARN_ON_ONCE(!enum_type); | |
3303 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3304 | if (ret) |
3305 | return ret; | |
3306 | return lttng_field_name_statedump(session, field, nesting); | |
3307 | } | |
3308 | ||
3309 | static | |
8cdc1a81 | 3310 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3311 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3312 | size_t nesting) |
3313 | { | |
3314 | int ret; | |
3315 | ||
437d5aa5 MD |
3316 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3317 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3318 | if (ret) |
3319 | return ret; | |
3320 | return lttng_field_name_statedump(session, field, nesting); | |
3321 | } | |
3322 | ||
3323 | static | |
8cdc1a81 | 3324 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3325 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3326 | size_t nesting) |
3327 | { | |
3328 | int ret; | |
3329 | ||
ceabb767 MD |
3330 | /* Default encoding is UTF8 */ |
3331 | ret = print_tabs(session, nesting); | |
3332 | if (ret) | |
3333 | return ret; | |
3334 | ret = lttng_metadata_printf(session, | |
3335 | "string%s", | |
437d5aa5 | 3336 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3337 | " { encoding = ASCII; }" : ""); |
3338 | return ret; | |
3339 | } | |
3340 | ||
3341 | static | |
8cdc1a81 | 3342 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3343 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3344 | size_t nesting) |
ceabb767 | 3345 | { |
437d5aa5 | 3346 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3347 | int ret; |
3348 | ||
437d5aa5 MD |
3349 | string_type = lttng_kernel_get_type_string(field->type); |
3350 | WARN_ON_ONCE(!string_type); | |
3351 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3352 | if (ret) |
3353 | return ret; | |
3354 | return lttng_field_name_statedump(session, field, nesting); | |
3355 | } | |
3356 | ||
3357 | /* | |
3358 | * Must be called with sessions_mutex held. | |
3359 | */ | |
3360 | static | |
8cdc1a81 | 3361 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3362 | const struct lttng_kernel_type_common *type, |
3363 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3364 | size_t nesting) |
c099397a | 3365 | { |
c099397a | 3366 | int ret = 0; |
c099397a | 3367 | |
12bb2edb MD |
3368 | switch (type->type) { |
3369 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3370 | ret = _lttng_integer_type_statedump(session, |
3371 | lttng_kernel_get_type_integer(type), | |
3372 | parent_encoding, nesting); | |
8070f5c0 | 3373 | break; |
437d5aa5 MD |
3374 | case lttng_kernel_type_enum: |
3375 | ret = _lttng_enum_type_statedump(session, | |
3376 | lttng_kernel_get_type_enum(type), | |
3377 | nesting); | |
8070f5c0 | 3378 | break; |
12bb2edb | 3379 | case lttng_kernel_type_string: |
437d5aa5 MD |
3380 | ret = _lttng_string_type_statedump(session, |
3381 | lttng_kernel_get_type_string(type), | |
3382 | nesting); | |
ceabb767 | 3383 | break; |
437d5aa5 MD |
3384 | case lttng_kernel_type_struct: |
3385 | ret = _lttng_struct_type_statedump(session, | |
3386 | lttng_kernel_get_type_struct(type), | |
3387 | nesting); | |
8070f5c0 | 3388 | break; |
437d5aa5 MD |
3389 | case lttng_kernel_type_variant: |
3390 | ret = _lttng_variant_type_statedump(session, | |
3391 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3392 | nesting, NULL); |
ceabb767 MD |
3393 | break; |
3394 | ||
3395 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3396 | case lttng_kernel_type_array: |
3397 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3398 | default: |
3399 | WARN_ON_ONCE(1); | |
3400 | return -EINVAL; | |
8070f5c0 | 3401 | } |
ceabb767 MD |
3402 | return ret; |
3403 | } | |
8070f5c0 | 3404 | |
ceabb767 MD |
3405 | /* |
3406 | * Must be called with sessions_mutex held. | |
3407 | */ | |
3408 | static | |
8cdc1a81 | 3409 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3410 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3411 | size_t nesting, |
3412 | const char **prev_field_name_p) | |
ceabb767 | 3413 | { |
51ef4536 | 3414 | const char *prev_field_name = NULL; |
ceabb767 | 3415 | int ret = 0; |
27d2368e | 3416 | |
51ef4536 MD |
3417 | if (prev_field_name_p) |
3418 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3419 | switch (field->type->type) { |
12bb2edb | 3420 | case lttng_kernel_type_integer: |
ceabb767 MD |
3421 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3422 | break; | |
437d5aa5 | 3423 | case lttng_kernel_type_enum: |
ceabb767 | 3424 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3425 | break; |
12bb2edb | 3426 | case lttng_kernel_type_string: |
ceabb767 | 3427 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3428 | break; |
437d5aa5 | 3429 | case lttng_kernel_type_struct: |
ceabb767 | 3430 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3431 | break; |
437d5aa5 | 3432 | case lttng_kernel_type_array: |
ceabb767 | 3433 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3434 | break; |
437d5aa5 | 3435 | case lttng_kernel_type_sequence: |
51ef4536 | 3436 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3437 | break; |
437d5aa5 | 3438 | case lttng_kernel_type_variant: |
51ef4536 | 3439 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3440 | break; |
f513b2bf | 3441 | |
8070f5c0 MD |
3442 | default: |
3443 | WARN_ON_ONCE(1); | |
3444 | return -EINVAL; | |
3445 | } | |
51ef4536 MD |
3446 | if (prev_field_name_p) |
3447 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3448 | return ret; |
3449 | } | |
3450 | ||
3451 | static | |
8cdc1a81 | 3452 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3453 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3454 | { |
51ef4536 | 3455 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3456 | int ret = 0; |
3457 | int i; | |
3458 | ||
3459 | if (!ctx) | |
3460 | return 0; | |
3461 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3462 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3463 | |
51ef4536 | 3464 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3465 | if (ret) |
3466 | return ret; | |
3467 | } | |
3468 | return ret; | |
3469 | } | |
3470 | ||
3471 | static | |
8cdc1a81 | 3472 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3473 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3474 | { |
51ef4536 | 3475 | const char *prev_field_name = NULL; |
a67ba386 | 3476 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3477 | int ret = 0; |
3478 | int i; | |
3479 | ||
6c8c025b MD |
3480 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3481 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3482 | |
51ef4536 | 3483 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3484 | if (ret) |
3485 | return ret; | |
c099397a MD |
3486 | } |
3487 | return ret; | |
3488 | } | |
3489 | ||
d83004aa JD |
3490 | /* |
3491 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3492 | * The entire event metadata is printed as a single atomic metadata |
3493 | * transaction. | |
d83004aa | 3494 | */ |
c099397a | 3495 | static |
ee7e9a18 | 3496 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3497 | { |
ee7e9a18 MD |
3498 | struct lttng_kernel_event_recorder *event_recorder; |
3499 | struct lttng_kernel_channel_buffer *chan; | |
3500 | struct lttng_kernel_session *session; | |
c099397a MD |
3501 | int ret = 0; |
3502 | ||
ee7e9a18 MD |
3503 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3504 | return 0; | |
3505 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3506 | chan = event_recorder->chan; | |
3507 | session = chan->parent.session; | |
3508 | ||
a67ba386 | 3509 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3510 | return 0; |
f7d06400 | 3511 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3512 | return 0; |
3513 | ||
8b97fd42 MD |
3514 | lttng_metadata_begin(session); |
3515 | ||
c099397a MD |
3516 | ret = lttng_metadata_printf(session, |
3517 | "event {\n" | |
ae734547 | 3518 | " name = \"%s\";\n" |
c099397a | 3519 | " id = %u;\n" |
b9074a1b | 3520 | " stream_id = %u;\n", |
a67ba386 MD |
3521 | event_recorder->priv->parent.desc->event_name, |
3522 | event_recorder->priv->id, | |
f7d06400 | 3523 | event_recorder->chan->priv->id); |
c099397a MD |
3524 | if (ret) |
3525 | goto end; | |
3526 | ||
8070f5c0 | 3527 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3528 | " fields := struct {\n" |
3529 | ); | |
3530 | if (ret) | |
3531 | goto end; | |
3532 | ||
a67ba386 | 3533 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3534 | if (ret) |
3535 | goto end; | |
3536 | ||
3537 | /* | |
3538 | * LTTng space reservation can only reserve multiples of the | |
3539 | * byte size. | |
3540 | */ | |
3541 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3542 | " };\n" |
3543 | "};\n\n"); | |
c099397a MD |
3544 | if (ret) |
3545 | goto end; | |
3546 | ||
a67ba386 | 3547 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3548 | end: |
8b97fd42 | 3549 | lttng_metadata_end(session); |
c099397a MD |
3550 | return ret; |
3551 | ||
3552 | } | |
3553 | ||
d83004aa JD |
3554 | /* |
3555 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3556 | * The entire channel metadata is printed as a single atomic metadata |
3557 | * transaction. | |
d83004aa | 3558 | */ |
c099397a | 3559 | static |
8cdc1a81 | 3560 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3561 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3562 | { |
3563 | int ret = 0; | |
3564 | ||
f7d06400 | 3565 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3566 | return 0; |
d83004aa | 3567 | |
f7d06400 | 3568 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3569 | return 0; |
3570 | ||
8b97fd42 MD |
3571 | lttng_metadata_begin(session); |
3572 | ||
f7d06400 | 3573 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3574 | ret = lttng_metadata_printf(session, |
3575 | "stream {\n" | |
3576 | " id = %u;\n" | |
9115fbdc | 3577 | " event.header := %s;\n" |
b9074a1b | 3578 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3579 | chan->priv->id, |
3580 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3581 | "struct event_header_large"); |
3582 | if (ret) | |
3583 | goto end; | |
3584 | ||
f7d06400 | 3585 | if (chan->priv->ctx) { |
b9074a1b MD |
3586 | ret = lttng_metadata_printf(session, |
3587 | " event.context := struct {\n"); | |
3588 | if (ret) | |
3589 | goto end; | |
3590 | } | |
f7d06400 | 3591 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3592 | if (ret) |
3593 | goto end; | |
f7d06400 | 3594 | if (chan->priv->ctx) { |
b9074a1b MD |
3595 | ret = lttng_metadata_printf(session, |
3596 | " };\n"); | |
3597 | if (ret) | |
3598 | goto end; | |
3599 | } | |
8070f5c0 MD |
3600 | |
3601 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3602 | "};\n\n"); |
8070f5c0 | 3603 | |
f7d06400 | 3604 | chan->priv->metadata_dumped = 1; |
c099397a | 3605 | end: |
8b97fd42 | 3606 | lttng_metadata_end(session); |
c099397a MD |
3607 | return ret; |
3608 | } | |
3609 | ||
d83004aa JD |
3610 | /* |
3611 | * Must be called with sessions_mutex held. | |
3612 | */ | |
9115fbdc | 3613 | static |
8cdc1a81 | 3614 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3615 | { |
3616 | return lttng_metadata_printf(session, | |
3617 | "struct packet_context {\n" | |
a3ccff4f MD |
3618 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3619 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3620 | " uint64_t content_size;\n" |
3621 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3622 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3623 | " unsigned long events_discarded;\n" |
9115fbdc | 3624 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3625 | "};\n\n" |
9115fbdc MD |
3626 | ); |
3627 | } | |
3628 | ||
3629 | /* | |
3630 | * Compact header: | |
3631 | * id: range: 0 - 30. | |
3632 | * id 31 is reserved to indicate an extended header. | |
3633 | * | |
3634 | * Large header: | |
3635 | * id: range: 0 - 65534. | |
3636 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3637 | * |
3638 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3639 | */ |
3640 | static | |
8cdc1a81 | 3641 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3642 | { |
3643 | return lttng_metadata_printf(session, | |
3644 | "struct event_header_compact {\n" | |
3645 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3646 | " variant <id> {\n" | |
3647 | " struct {\n" | |
a3ccff4f | 3648 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3649 | " } compact;\n" |
3650 | " struct {\n" | |
3651 | " uint32_t id;\n" | |
a3ccff4f | 3652 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3653 | " } extended;\n" |
3654 | " } v;\n" | |
3655 | "} align(%u);\n" | |
3656 | "\n" | |
3657 | "struct event_header_large {\n" | |
3658 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3659 | " variant <id> {\n" | |
3660 | " struct {\n" | |
a3ccff4f | 3661 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3662 | " } compact;\n" |
3663 | " struct {\n" | |
3664 | " uint32_t id;\n" | |
a3ccff4f | 3665 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3666 | " } extended;\n" |
3667 | " } v;\n" | |
3668 | "} align(%u);\n\n", | |
a90917c3 MD |
3669 | lttng_alignof(uint32_t) * CHAR_BIT, |
3670 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3671 | ); |
3672 | } | |
3673 | ||
a3ccff4f MD |
3674 | /* |
3675 | * Approximation of NTP time of day to clock monotonic correlation, | |
3676 | * taken at start of trace. | |
3677 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3678 | * in future versions. | |
5283350b MD |
3679 | * This function may return a negative offset. It may happen if the |
3680 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3681 | * |
3682 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3683 | * y2038 compliant. | |
a3ccff4f MD |
3684 | */ |
3685 | static | |
8967b2a3 | 3686 | int64_t measure_clock_offset(void) |
a3ccff4f | 3687 | { |
dcb93448 | 3688 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3689 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3690 | int64_t offset; |
a3ccff4f | 3691 | unsigned long flags; |
3636085f MJ |
3692 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3693 | struct timespec64 rts = { 0, 0 }; | |
3694 | #else | |
3695 | struct timespec rts = { 0, 0 }; | |
3696 | #endif | |
a3ccff4f MD |
3697 | |
3698 | /* Disable interrupts to increase correlation precision. */ | |
3699 | local_irq_save(flags); | |
3700 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3701 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3702 | ktime_get_real_ts64(&rts); | |
3703 | #else | |
216b6baa | 3704 | getnstimeofday(&rts); |
3636085f | 3705 | #endif |
a3ccff4f MD |
3706 | monotonic[1] = trace_clock_read64(); |
3707 | local_irq_restore(flags); | |
3708 | ||
dcb93448 | 3709 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3710 | realtime = (uint64_t) rts.tv_sec * tcf; |
3711 | if (tcf == NSEC_PER_SEC) { | |
3712 | realtime += rts.tv_nsec; | |
3713 | } else { | |
3714 | uint64_t n = rts.tv_nsec * tcf; | |
3715 | ||
3716 | do_div(n, NSEC_PER_SEC); | |
3717 | realtime += n; | |
3718 | } | |
dcb93448 | 3719 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3720 | return offset; |
3721 | } | |
3722 | ||
3eb95be4 | 3723 | static |
8cdc1a81 | 3724 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3725 | { |
0f3eaad4 | 3726 | int ret = 0; |
3eb95be4 JR |
3727 | size_t i; |
3728 | char cur; | |
3729 | ||
3730 | i = 0; | |
3731 | cur = string[i]; | |
3732 | while (cur != '\0') { | |
3733 | switch (cur) { | |
3734 | case '\n': | |
3735 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3736 | break; | |
3737 | case '\\': | |
3738 | case '"': | |
3739 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3740 | if (ret) | |
3741 | goto error; | |
3742 | /* We still print the current char */ | |
c190d76e | 3743 | lttng_fallthrough; |
3eb95be4 JR |
3744 | default: |
3745 | ret = lttng_metadata_printf(session, "%c", cur); | |
3746 | break; | |
3747 | } | |
3748 | ||
3749 | if (ret) | |
3750 | goto error; | |
3751 | ||
3752 | cur = string[++i]; | |
3753 | } | |
3754 | error: | |
3755 | return ret; | |
3756 | } | |
3757 | ||
3758 | static | |
8cdc1a81 | 3759 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3760 | const char *field_value) |
3eb95be4 JR |
3761 | { |
3762 | int ret; | |
3763 | ||
1c88f269 | 3764 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3765 | if (ret) |
3766 | goto error; | |
3767 | ||
1c88f269 | 3768 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3769 | if (ret) |
3770 | goto error; | |
3771 | ||
3772 | ret = lttng_metadata_printf(session, "\";\n"); | |
3773 | ||
3774 | error: | |
3775 | return ret; | |
3776 | } | |
3777 | ||
c099397a MD |
3778 | /* |
3779 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3780 | * Must be called with sessions_mutex held. |
c099397a MD |
3781 | */ |
3782 | static | |
8cdc1a81 | 3783 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3784 | { |
8cdc1a81 | 3785 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3786 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3787 | const char *product_uuid; |
f7d06400 | 3788 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3789 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3790 | int ret = 0; |
3791 | ||
585e5dcc | 3792 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3793 | return 0; |
8b97fd42 MD |
3794 | |
3795 | lttng_metadata_begin(session); | |
3796 | ||
8cdc1a81 | 3797 | if (session->priv->metadata_dumped) |
c099397a | 3798 | goto skip_session; |
c099397a | 3799 | |
d793d5e1 | 3800 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3801 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3802 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3803 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3804 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3805 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3806 | |
3807 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3808 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3809 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3810 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3811 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3812 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3813 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3814 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3815 | "\n" |
3816 | "trace {\n" | |
3817 | " major = %u;\n" | |
3818 | " minor = %u;\n" | |
30bdb6e4 | 3819 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3820 | " byte_order = %s;\n" |
3821 | " packet.header := struct {\n" | |
3822 | " uint32_t magic;\n" | |
1ec3f75a | 3823 | " uint8_t uuid[16];\n" |
d793d5e1 | 3824 | " uint32_t stream_id;\n" |
5594698f | 3825 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3826 | " };\n" |
d793d5e1 | 3827 | "};\n\n", |
a90917c3 MD |
3828 | lttng_alignof(uint8_t) * CHAR_BIT, |
3829 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3830 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3831 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3832 | sizeof(unsigned long) * CHAR_BIT, |
3833 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3834 | CTF_SPEC_MAJOR, |
3835 | CTF_SPEC_MINOR, | |
d793d5e1 | 3836 | uuid_s, |
5214fa50 | 3837 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3838 | "be" |
3839 | #else | |
3840 | "le" | |
3841 | #endif | |
3842 | ); | |
3843 | if (ret) | |
3844 | goto end; | |
3845 | ||
99dc9597 MD |
3846 | ret = lttng_metadata_printf(session, |
3847 | "env {\n" | |
a6058143 | 3848 | " hostname = \"%s\";\n" |
c6c9e10f | 3849 | " domain = \"kernel\";\n" |
99dc9597 | 3850 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3851 | " kernel_release = \"%s\";\n" |
3852 | " kernel_version = \"%s\";\n" | |
3853 | " tracer_name = \"lttng-modules\";\n" | |
3854 | " tracer_major = %d;\n" | |
3855 | " tracer_minor = %d;\n" | |
3856 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3857 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3858 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3859 | utsname()->sysname, |
3860 | utsname()->release, | |
c6c9e10f MD |
3861 | utsname()->version, |
3862 | LTTNG_MODULES_MAJOR_VERSION, | |
3863 | LTTNG_MODULES_MINOR_VERSION, | |
3864 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3865 | ); |
3866 | if (ret) | |
3867 | goto end; | |
3868 | ||
8cdc1a81 | 3869 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3870 | if (ret) |
3871 | goto end; | |
3872 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3873 | session->priv->creation_time); |
3eb95be4 JR |
3874 | if (ret) |
3875 | goto end; | |
3876 | ||
c88f762e GB |
3877 | /* Add the product UUID to the 'env' section */ |
3878 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3879 | if (product_uuid) { | |
3880 | ret = lttng_metadata_printf(session, | |
3881 | " product_uuid = \"%s\";\n", | |
3882 | product_uuid | |
3883 | ); | |
3884 | if (ret) | |
3885 | goto end; | |
3886 | } | |
3887 | ||
3888 | /* Close the 'env' section */ | |
3eb95be4 JR |
3889 | ret = lttng_metadata_printf(session, "};\n\n"); |
3890 | if (ret) | |
3891 | goto end; | |
3892 | ||
a3ccff4f MD |
3893 | ret = lttng_metadata_printf(session, |
3894 | "clock {\n" | |
2754583e MD |
3895 | " name = \"%s\";\n", |
3896 | trace_clock_name() | |
a82c63f1 MD |
3897 | ); |
3898 | if (ret) | |
3899 | goto end; | |
3900 | ||
3901 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3902 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3903 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3904 | clock_uuid_s |
3905 | ); | |
3906 | if (ret) | |
3907 | goto end; | |
3908 | } | |
3909 | ||
3910 | ret = lttng_metadata_printf(session, | |
2754583e | 3911 | " description = \"%s\";\n" |
a3ccff4f MD |
3912 | " freq = %llu; /* Frequency, in Hz */\n" |
3913 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3914 | " offset = %lld;\n" |
a3ccff4f | 3915 | "};\n\n", |
2754583e | 3916 | trace_clock_description(), |
a3ccff4f | 3917 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3918 | (long long) measure_clock_offset() |
a3ccff4f MD |
3919 | ); |
3920 | if (ret) | |
3921 | goto end; | |
3922 | ||
3923 | ret = lttng_metadata_printf(session, | |
3924 | "typealias integer {\n" | |
3925 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3926 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3927 | "} := uint27_clock_monotonic_t;\n" |
3928 | "\n" | |
3929 | "typealias integer {\n" | |
3930 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3931 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3932 | "} := uint32_clock_monotonic_t;\n" |
3933 | "\n" | |
3934 | "typealias integer {\n" | |
3935 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3936 | " map = clock.%s.value;\n" |
a3ccff4f | 3937 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3938 | trace_clock_name(), |
a3ccff4f | 3939 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3940 | trace_clock_name(), |
3941 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3942 | trace_clock_name() | |
a3ccff4f MD |
3943 | ); |
3944 | if (ret) | |
3945 | goto end; | |
3946 | ||
a90917c3 | 3947 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3948 | if (ret) |
3949 | goto end; | |
3950 | ||
a90917c3 | 3951 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3952 | if (ret) |
3953 | goto end; | |
3954 | ||
c099397a | 3955 | skip_session: |
f7d06400 MD |
3956 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3957 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3958 | if (ret) |
3959 | goto end; | |
3960 | } | |
3961 | ||
f237aef8 | 3962 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3963 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3964 | if (ret) |
3965 | goto end; | |
3966 | } | |
8cdc1a81 | 3967 | session->priv->metadata_dumped = 1; |
c099397a | 3968 | end: |
8b97fd42 | 3969 | lttng_metadata_end(session); |
c099397a MD |
3970 | return ret; |
3971 | } | |
3972 | ||
c0e31d2e | 3973 | /** |
a90917c3 | 3974 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3975 | * @transport: transport structure |
3976 | * | |
3977 | * Registers a transport which can be used as output to extract the data out of | |
3978 | * LTTng. The module calling this registration function must ensure that no | |
3979 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3980 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3981 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3982 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3983 | * after its registration must it synchronize the TLBs. |
3984 | */ | |
a90917c3 | 3985 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3986 | { |
3987 | /* | |
3988 | * Make sure no page fault can be triggered by the module about to be | |
3989 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3990 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3991 | */ |
263b6c88 | 3992 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3993 | |
3994 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3995 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3996 | mutex_unlock(&sessions_mutex); |
3997 | } | |
a90917c3 | 3998 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3999 | |
4000 | /** | |
a90917c3 | 4001 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4002 | * @transport: transport structure |
4003 | */ | |
a90917c3 | 4004 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4005 | { |
4006 | mutex_lock(&sessions_mutex); | |
4007 | list_del(&transport->node); | |
4008 | mutex_unlock(&sessions_mutex); | |
4009 | } | |
a90917c3 | 4010 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4011 | |
a101fa10 MD |
4012 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4013 | { | |
4014 | /* | |
4015 | * Make sure no page fault can be triggered by the module about to be | |
4016 | * registered. We deal with this here so we don't have to call | |
4017 | * vmalloc_sync_mappings() in each module's init. | |
4018 | */ | |
4019 | wrapper_vmalloc_sync_mappings(); | |
4020 | ||
4021 | mutex_lock(&sessions_mutex); | |
4022 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4023 | mutex_unlock(&sessions_mutex); | |
4024 | } | |
4025 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4026 | ||
4027 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4028 | { | |
4029 | mutex_lock(&sessions_mutex); | |
4030 | list_del(&transport->node); | |
4031 | mutex_unlock(&sessions_mutex); | |
4032 | } | |
4033 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4034 | ||
5f4c791e | 4035 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4036 | |
4037 | enum cpuhp_state lttng_hp_prepare; | |
4038 | enum cpuhp_state lttng_hp_online; | |
4039 | ||
4040 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4041 | { | |
4042 | struct lttng_cpuhp_node *lttng_node; | |
4043 | ||
4044 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4045 | switch (lttng_node->component) { | |
4046 | case LTTNG_RING_BUFFER_FRONTEND: | |
4047 | return 0; | |
4048 | case LTTNG_RING_BUFFER_BACKEND: | |
4049 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4050 | case LTTNG_RING_BUFFER_ITER: | |
4051 | return 0; | |
4052 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4053 | return 0; | |
4054 | default: | |
4055 | return -EINVAL; | |
4056 | } | |
4057 | } | |
4058 | ||
4059 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4060 | { | |
4061 | struct lttng_cpuhp_node *lttng_node; | |
4062 | ||
4063 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4064 | switch (lttng_node->component) { | |
4065 | case LTTNG_RING_BUFFER_FRONTEND: | |
4066 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4067 | case LTTNG_RING_BUFFER_BACKEND: | |
4068 | return 0; | |
4069 | case LTTNG_RING_BUFFER_ITER: | |
4070 | return 0; | |
4071 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4072 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4073 | default: | |
4074 | return -EINVAL; | |
4075 | } | |
4076 | } | |
4077 | ||
4078 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4079 | { | |
4080 | struct lttng_cpuhp_node *lttng_node; | |
4081 | ||
4082 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4083 | switch (lttng_node->component) { | |
4084 | case LTTNG_RING_BUFFER_FRONTEND: | |
4085 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4086 | case LTTNG_RING_BUFFER_BACKEND: | |
4087 | return 0; | |
4088 | case LTTNG_RING_BUFFER_ITER: | |
4089 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4090 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4091 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4092 | default: | |
4093 | return -EINVAL; | |
4094 | } | |
4095 | } | |
4096 | ||
4097 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4098 | { | |
4099 | struct lttng_cpuhp_node *lttng_node; | |
4100 | ||
4101 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4102 | switch (lttng_node->component) { | |
4103 | case LTTNG_RING_BUFFER_FRONTEND: | |
4104 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4105 | case LTTNG_RING_BUFFER_BACKEND: | |
4106 | return 0; | |
4107 | case LTTNG_RING_BUFFER_ITER: | |
4108 | return 0; | |
4109 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4110 | return 0; | |
4111 | default: | |
4112 | return -EINVAL; | |
4113 | } | |
4114 | } | |
4115 | ||
4116 | static int __init lttng_init_cpu_hotplug(void) | |
4117 | { | |
4118 | int ret; | |
4119 | ||
4120 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4121 | lttng_hotplug_prepare, | |
4122 | lttng_hotplug_dead); | |
4123 | if (ret < 0) { | |
4124 | return ret; | |
4125 | } | |
4126 | lttng_hp_prepare = ret; | |
4127 | lttng_rb_set_hp_prepare(ret); | |
4128 | ||
4129 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4130 | lttng_hotplug_online, | |
4131 | lttng_hotplug_offline); | |
4132 | if (ret < 0) { | |
4133 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4134 | lttng_hp_prepare = 0; | |
4135 | return ret; | |
4136 | } | |
4137 | lttng_hp_online = ret; | |
4138 | lttng_rb_set_hp_online(ret); | |
4139 | ||
4140 | return 0; | |
4141 | } | |
4142 | ||
4143 | static void __exit lttng_exit_cpu_hotplug(void) | |
4144 | { | |
4145 | lttng_rb_set_hp_online(0); | |
4146 | cpuhp_remove_multi_state(lttng_hp_online); | |
4147 | lttng_rb_set_hp_prepare(0); | |
4148 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4149 | } | |
4150 | ||
5f4c791e | 4151 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4152 | static int lttng_init_cpu_hotplug(void) |
4153 | { | |
4154 | return 0; | |
4155 | } | |
4156 | static void lttng_exit_cpu_hotplug(void) | |
4157 | { | |
4158 | } | |
5f4c791e | 4159 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4160 | |
a90917c3 | 4161 | static int __init lttng_events_init(void) |
4e3c1b9b | 4162 | { |
1c25284c MD |
4163 | int ret; |
4164 | ||
453b2495 JD |
4165 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4166 | if (ret) | |
4167 | return ret; | |
389d7070 | 4168 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4169 | if (ret) |
4170 | return ret; | |
4171 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4172 | if (ret) |
4173 | return ret; | |
4174 | ret = lttng_probes_init(); | |
389d7070 MD |
4175 | if (ret) |
4176 | return ret; | |
07dfc1d0 | 4177 | ret = lttng_context_init(); |
20591cf7 MD |
4178 | if (ret) |
4179 | return ret; | |
07dfc1d0 MD |
4180 | ret = lttng_tracepoint_init(); |
4181 | if (ret) | |
4182 | goto error_tp; | |
a67ba386 MD |
4183 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4184 | if (!event_recorder_cache) { | |
20591cf7 | 4185 | ret = -ENOMEM; |
a67ba386 | 4186 | goto error_kmem_event_recorder; |
dffef45d | 4187 | } |
a67ba386 MD |
4188 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4189 | if (!event_recorder_private_cache) { | |
4190 | ret = -ENOMEM; | |
4191 | goto error_kmem_event_recorder_private; | |
4192 | } | |
4193 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4194 | if (!event_notifier_cache) { |
4195 | ret = -ENOMEM; | |
4196 | goto error_kmem_event_notifier; | |
20591cf7 | 4197 | } |
a67ba386 MD |
4198 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4199 | if (!event_notifier_private_cache) { | |
4200 | ret = -ENOMEM; | |
4201 | goto error_kmem_event_notifier_private; | |
4202 | } | |
80996790 | 4203 | ret = lttng_abi_init(); |
02119ee5 MD |
4204 | if (ret) |
4205 | goto error_abi; | |
0c956676 MD |
4206 | ret = lttng_logger_init(); |
4207 | if (ret) | |
4208 | goto error_logger; | |
1e367326 MD |
4209 | ret = lttng_init_cpu_hotplug(); |
4210 | if (ret) | |
4211 | goto error_hotplug; | |
101215b7 | 4212 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4213 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4214 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4215 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4216 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4217 | LTTNG_VERSION_NAME, |
4218 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4219 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4220 | #else | |
4221 | "", | |
4222 | #endif | |
4223 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4224 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4225 | #else | |
4226 | ""); | |
4227 | #endif | |
c1551e57 MJ |
4228 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4229 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4230 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4231 | return 0; |
0c956676 | 4232 | |
1e367326 MD |
4233 | error_hotplug: |
4234 | lttng_logger_exit(); | |
0c956676 MD |
4235 | error_logger: |
4236 | lttng_abi_exit(); | |
02119ee5 | 4237 | error_abi: |
a67ba386 MD |
4238 | kmem_cache_destroy(event_notifier_private_cache); |
4239 | error_kmem_event_notifier_private: | |
dffef45d FD |
4240 | kmem_cache_destroy(event_notifier_cache); |
4241 | error_kmem_event_notifier: | |
a67ba386 MD |
4242 | kmem_cache_destroy(event_recorder_private_cache); |
4243 | error_kmem_event_recorder_private: | |
4244 | kmem_cache_destroy(event_recorder_cache); | |
4245 | error_kmem_event_recorder: | |
20591cf7 | 4246 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4247 | error_tp: |
4248 | lttng_context_exit(); | |
101215b7 | 4249 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4250 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4251 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4252 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4253 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4254 | LTTNG_VERSION_NAME, |
4255 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4256 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4257 | #else | |
4258 | "", | |
4259 | #endif | |
4260 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4261 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4262 | #else | |
4263 | ""); | |
4264 | #endif | |
1c25284c | 4265 | return ret; |
4e3c1b9b MD |
4266 | } |
4267 | ||
a90917c3 | 4268 | module_init(lttng_events_init); |
11b5a3c2 | 4269 | |
a90917c3 | 4270 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4271 | { |
8cdc1a81 | 4272 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4273 | |
1e367326 | 4274 | lttng_exit_cpu_hotplug(); |
0c956676 | 4275 | lttng_logger_exit(); |
80996790 | 4276 | lttng_abi_exit(); |
8cdc1a81 MD |
4277 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4278 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4279 | kmem_cache_destroy(event_recorder_cache); |
4280 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4281 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4282 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4283 | lttng_tracepoint_exit(); |
07dfc1d0 | 4284 | lttng_context_exit(); |
101215b7 | 4285 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4286 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4287 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4288 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4289 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4290 | LTTNG_VERSION_NAME, |
4291 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4292 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4293 | #else | |
4294 | "", | |
4295 | #endif | |
4296 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4297 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4298 | #else | |
4299 | ""); | |
4300 | #endif | |
4e3c1b9b | 4301 | } |
92e94819 | 4302 | |
a90917c3 | 4303 | module_exit(lttng_events_exit); |
11b5a3c2 | 4304 | |
7ca11e77 | 4305 | #include <generated/patches.h> |
101215b7 MJ |
4306 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4307 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4308 | #endif | |
4309 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4310 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4311 | #endif | |
92e94819 MD |
4312 | MODULE_LICENSE("GPL and additional rights"); |
4313 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4314 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4315 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4316 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4317 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4318 | LTTNG_MODULES_EXTRAVERSION); |