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 | |
c190d76e MJ |
1273 | case LTTNG_KERNEL_ABI_FUNCTION: |
1274 | lttng_fallthrough; | |
1275 | case LTTNG_KERNEL_ABI_NOOP: | |
1276 | lttng_fallthrough; | |
baf20995 MD |
1277 | default: |
1278 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1279 | ret = -EINVAL; |
df07930b | 1280 | goto register_error; |
baf20995 | 1281 | } |
13a2dfca | 1282 | |
ee7e9a18 | 1283 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1284 | WARN_ON_ONCE(ret > 0); |
1285 | if (ret) { | |
c099397a | 1286 | goto statedump_error; |
abc0446a | 1287 | } |
dffef45d | 1288 | |
ccefc7ab MD |
1289 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1290 | if (ret) | |
1291 | goto register_error; | |
c4e31059 | 1292 | |
c4e31059 | 1293 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1294 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1295 | |
13a2dfca | 1296 | return event; |
dffef45d | 1297 | |
13a2dfca MD |
1298 | statedump_error: |
1299 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1300 | register_error: |
756a020c MD |
1301 | lttng_kernel_event_free(event); |
1302 | alloc_error: | |
dffef45d FD |
1303 | exist: |
1304 | type_error: | |
13a2dfca | 1305 | full: |
dffef45d FD |
1306 | return ERR_PTR(ret); |
1307 | } | |
1308 | ||
83006ee0 MD |
1309 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1310 | const struct lttng_kernel_event_desc *event_desc) | |
1311 | { | |
1312 | struct lttng_kernel_event_common *event; | |
1313 | ||
1314 | mutex_lock(&sessions_mutex); | |
1315 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1316 | mutex_unlock(&sessions_mutex); | |
1317 | return event; | |
1318 | } | |
1319 | ||
99f52fcc FD |
1320 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1321 | const size_t *dim_indexes, int32_t cpu, | |
1322 | int64_t *val, bool *overflow, bool *underflow) | |
1323 | { | |
1324 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1325 | cpu, val, overflow, underflow); | |
1326 | } | |
1327 | ||
1328 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1329 | const size_t *dim_indexes, int64_t *val, | |
1330 | bool *overflow, bool *underflow) | |
1331 | { | |
1332 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1333 | val, overflow, underflow); | |
1334 | } | |
1335 | ||
1336 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1337 | const size_t *dim_indexes) | |
1338 | { | |
1339 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1340 | } | |
1341 | ||
6a338ba4 | 1342 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1343 | static |
0c851fa0 | 1344 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1345 | { |
437d5aa5 | 1346 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1347 | int ret = -EINVAL; |
3c997079 | 1348 | |
6a338ba4 | 1349 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1350 | |
0c851fa0 MD |
1351 | desc = event->priv->desc; |
1352 | switch (event->priv->instrumentation) { | |
606828e4 | 1353 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1354 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1355 | desc->tp_class->probe_callback, |
0c851fa0 | 1356 | event); |
4ecb5ad5 | 1357 | break; |
b4a75708 | 1358 | |
606828e4 | 1359 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1360 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1361 | break; |
b4a75708 | 1362 | |
c190d76e MJ |
1363 | case LTTNG_KERNEL_ABI_KPROBE: |
1364 | lttng_fallthrough; | |
1365 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1366 | ret = 0; |
f0bcc14c | 1367 | break; |
0c851fa0 MD |
1368 | |
1369 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1370 | switch (event->type) { | |
1371 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1372 | ret = 0; | |
1373 | break; | |
1374 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1375 | WARN_ON_ONCE(1); | |
1376 | break; | |
1377 | } | |
4ecb5ad5 | 1378 | break; |
b4a75708 | 1379 | |
c190d76e MJ |
1380 | case LTTNG_KERNEL_ABI_FUNCTION: |
1381 | lttng_fallthrough; | |
1382 | case LTTNG_KERNEL_ABI_NOOP: | |
1383 | lttng_fallthrough; | |
4ecb5ad5 MD |
1384 | default: |
1385 | WARN_ON_ONCE(1); | |
1386 | } | |
6a338ba4 | 1387 | WARN_ON_ONCE(ret); |
3c997079 | 1388 | if (!ret) |
0c851fa0 | 1389 | event->priv->registered = 1; |
3c997079 MD |
1390 | } |
1391 | ||
6a338ba4 MD |
1392 | static |
1393 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1394 | { |
f0bcc14c | 1395 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1396 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1397 | int ret = -EINVAL; |
1398 | ||
6a338ba4 | 1399 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1400 | |
a67ba386 MD |
1401 | desc = event_priv->desc; |
1402 | switch (event_priv->instrumentation) { | |
606828e4 | 1403 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1404 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1405 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1406 | event); |
baf20995 | 1407 | break; |
b4a75708 | 1408 | |
606828e4 | 1409 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1410 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1411 | ret = 0; |
1412 | break; | |
b4a75708 | 1413 | |
606828e4 | 1414 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1415 | switch (event->type) { |
1416 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1417 | lttng_kretprobes_unregister(event); | |
1418 | ret = 0; | |
1419 | break; | |
1420 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1421 | WARN_ON_ONCE(1); | |
1422 | break; | |
1423 | } | |
7371f44c | 1424 | break; |
b4a75708 | 1425 | |
606828e4 | 1426 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1427 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1428 | break; |
b4a75708 | 1429 | |
606828e4 | 1430 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1431 | switch (event->type) { |
1432 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1433 | ret = 0; | |
1434 | break; | |
1435 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1436 | WARN_ON_ONCE(1); | |
1437 | break; | |
1438 | } | |
259b6cb3 | 1439 | break; |
b4a75708 | 1440 | |
606828e4 | 1441 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1442 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1443 | ret = 0; |
1444 | break; | |
b4a75708 | 1445 | |
c190d76e MJ |
1446 | case LTTNG_KERNEL_ABI_FUNCTION: |
1447 | lttng_fallthrough; | |
baf20995 MD |
1448 | default: |
1449 | WARN_ON_ONCE(1); | |
1450 | } | |
6a338ba4 | 1451 | WARN_ON_ONCE(ret); |
3c997079 | 1452 | if (!ret) |
a67ba386 | 1453 | event_priv->registered = 0; |
6a338ba4 MD |
1454 | } |
1455 | ||
1456 | static | |
1457 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1458 | { | |
1459 | if (event->priv->registered) | |
1460 | unregister_event(event); | |
dda6a249 MD |
1461 | } |
1462 | ||
1463 | /* | |
1464 | * Only used internally at session destruction. | |
1465 | */ | |
be066e6c | 1466 | static |
0648898e | 1467 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1468 | { |
0648898e | 1469 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1470 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1471 | ||
0648898e MD |
1472 | lttng_free_event_filter_runtime(event); |
1473 | /* Free event enabler refs */ | |
1474 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1475 | &event_priv->enablers_ref_head, node) | |
1476 | kfree(enabler_ref); | |
b4a75708 | 1477 | |
0648898e MD |
1478 | switch (event->type) { |
1479 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1480 | { | |
1481 | struct lttng_kernel_event_recorder *event_recorder = | |
1482 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1483 | |
0648898e MD |
1484 | switch (event_priv->instrumentation) { |
1485 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1486 | lttng_event_desc_put(event_priv->desc); | |
1487 | break; | |
b4a75708 | 1488 | |
0648898e MD |
1489 | case LTTNG_KERNEL_ABI_KPROBE: |
1490 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1491 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1492 | break; |
b4a75708 | 1493 | |
0648898e MD |
1494 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1495 | module_put(event_priv->desc->owner); | |
eb6b47db | 1496 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1497 | break; |
b4a75708 | 1498 | |
0648898e MD |
1499 | case LTTNG_KERNEL_ABI_SYSCALL: |
1500 | break; | |
4e3c1b9b | 1501 | |
0648898e MD |
1502 | case LTTNG_KERNEL_ABI_UPROBE: |
1503 | module_put(event_priv->desc->owner); | |
17806c46 | 1504 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1505 | break; |
3ef5cc03 | 1506 | |
c190d76e MJ |
1507 | case LTTNG_KERNEL_ABI_FUNCTION: |
1508 | lttng_fallthrough; | |
1509 | case LTTNG_KERNEL_ABI_NOOP: | |
1510 | lttng_fallthrough; | |
0648898e MD |
1511 | default: |
1512 | WARN_ON_ONCE(1); | |
1513 | } | |
f237aef8 | 1514 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1515 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1516 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1517 | break; |
0648898e MD |
1518 | } |
1519 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1520 | { | |
1521 | struct lttng_kernel_event_notifier *event_notifier = | |
1522 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1523 | |
0648898e MD |
1524 | switch (event_notifier->priv->parent.instrumentation) { |
1525 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1526 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1527 | break; | |
b4a75708 | 1528 | |
0648898e MD |
1529 | case LTTNG_KERNEL_ABI_KPROBE: |
1530 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1531 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1532 | break; |
b4a75708 | 1533 | |
0648898e MD |
1534 | case LTTNG_KERNEL_ABI_SYSCALL: |
1535 | break; | |
b4a75708 | 1536 | |
0648898e MD |
1537 | case LTTNG_KERNEL_ABI_UPROBE: |
1538 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1539 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1540 | break; |
1541 | ||
c190d76e MJ |
1542 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1543 | lttng_fallthrough; | |
1544 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1545 | lttng_fallthrough; | |
1546 | case LTTNG_KERNEL_ABI_NOOP: | |
1547 | lttng_fallthrough; | |
0648898e MD |
1548 | default: |
1549 | WARN_ON_ONCE(1); | |
1550 | } | |
f237aef8 | 1551 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1552 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1553 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1554 | break; | |
1555 | } | |
dffef45d FD |
1556 | default: |
1557 | WARN_ON_ONCE(1); | |
1558 | } | |
dffef45d FD |
1559 | } |
1560 | ||
8c0393c3 | 1561 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1562 | enum tracker_type tracker_type) |
e0130fab | 1563 | { |
d1f652f8 MD |
1564 | switch (tracker_type) { |
1565 | case TRACKER_PID: | |
1566 | return &session->pid_tracker; | |
1567 | case TRACKER_VPID: | |
1568 | return &session->vpid_tracker; | |
1569 | case TRACKER_UID: | |
1570 | return &session->uid_tracker; | |
1571 | case TRACKER_VUID: | |
1572 | return &session->vuid_tracker; | |
1573 | case TRACKER_GID: | |
1574 | return &session->gid_tracker; | |
1575 | case TRACKER_VGID: | |
1576 | return &session->vgid_tracker; | |
1577 | default: | |
1578 | WARN_ON_ONCE(1); | |
1579 | return NULL; | |
1580 | } | |
1581 | } | |
1582 | ||
8cdc1a81 | 1583 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1584 | enum tracker_type tracker_type, int id) |
1585 | { | |
8c0393c3 | 1586 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1587 | int ret; |
1588 | ||
d1f652f8 MD |
1589 | tracker = get_tracker(session, tracker_type); |
1590 | if (!tracker) | |
1591 | return -EINVAL; | |
1592 | if (id < -1) | |
e0130fab MD |
1593 | return -EINVAL; |
1594 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1595 | if (id == -1) { |
1596 | /* track all ids: destroy tracker. */ | |
1597 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1598 | ret = 0; |
1599 | } else { | |
d1f652f8 | 1600 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1601 | } |
e0130fab MD |
1602 | mutex_unlock(&sessions_mutex); |
1603 | return ret; | |
1604 | } | |
1605 | ||
8cdc1a81 | 1606 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1607 | enum tracker_type tracker_type, int id) |
e0130fab | 1608 | { |
8c0393c3 | 1609 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1610 | int ret; |
1611 | ||
d1f652f8 MD |
1612 | tracker = get_tracker(session, tracker_type); |
1613 | if (!tracker) | |
1614 | return -EINVAL; | |
1615 | if (id < -1) | |
e0130fab MD |
1616 | return -EINVAL; |
1617 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1618 | if (id == -1) { |
1619 | /* untrack all ids: replace by empty tracker. */ | |
1620 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1621 | } else { |
d1f652f8 | 1622 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1623 | } |
e0130fab MD |
1624 | mutex_unlock(&sessions_mutex); |
1625 | return ret; | |
1626 | } | |
1627 | ||
7e6f9ef6 | 1628 | static |
d1f652f8 | 1629 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1630 | { |
8c0393c3 MD |
1631 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1632 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1633 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1634 | int iter = 0, i; |
1635 | ||
1636 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1637 | if (id_tracker_p) { |
1638 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1639 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1640 | |
f934e302 | 1641 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1642 | if (iter++ >= *pos) |
1643 | return e; | |
1644 | } | |
1645 | } | |
1646 | } else { | |
d1f652f8 | 1647 | /* ID tracker disabled. */ |
7e6f9ef6 | 1648 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1649 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1650 | } |
1651 | iter++; | |
1652 | } | |
1653 | /* End of list */ | |
1654 | return NULL; | |
1655 | } | |
1656 | ||
1657 | /* Called with sessions_mutex held. */ | |
1658 | static | |
d1f652f8 | 1659 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1660 | { |
8c0393c3 MD |
1661 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1662 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1663 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1664 | int iter = 0, i; |
1665 | ||
1666 | (*ppos)++; | |
d1f652f8 MD |
1667 | if (id_tracker_p) { |
1668 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1669 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1670 | |
f934e302 | 1671 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1672 | if (iter++ >= *ppos) |
1673 | return e; | |
1674 | } | |
1675 | } | |
1676 | } else { | |
d1f652f8 | 1677 | /* ID tracker disabled. */ |
7e6f9ef6 | 1678 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1679 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1680 | iter++; |
1681 | } | |
1682 | ||
1683 | /* End of list */ | |
1684 | return NULL; | |
1685 | } | |
1686 | ||
1687 | static | |
d1f652f8 | 1688 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1689 | { |
1690 | mutex_unlock(&sessions_mutex); | |
1691 | } | |
1692 | ||
1693 | static | |
d1f652f8 | 1694 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1695 | { |
8c0393c3 MD |
1696 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1697 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1698 | int id; |
7e6f9ef6 | 1699 | |
d1f652f8 | 1700 | if (p == id_tracker_p) { |
7e6f9ef6 | 1701 | /* Tracker disabled. */ |
d1f652f8 | 1702 | id = -1; |
7e6f9ef6 | 1703 | } else { |
d1f652f8 | 1704 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1705 | |
d1f652f8 MD |
1706 | id = lttng_id_tracker_get_node_id(e); |
1707 | } | |
8c0393c3 | 1708 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1709 | case TRACKER_PID: |
1710 | seq_printf(m, "process { pid = %d; };\n", id); | |
1711 | break; | |
1712 | case TRACKER_VPID: | |
1713 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1714 | break; | |
1715 | case TRACKER_UID: | |
1716 | seq_printf(m, "user { uid = %d; };\n", id); | |
1717 | break; | |
1718 | case TRACKER_VUID: | |
1719 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1720 | break; | |
1721 | case TRACKER_GID: | |
1722 | seq_printf(m, "group { gid = %d; };\n", id); | |
1723 | break; | |
1724 | case TRACKER_VGID: | |
1725 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1726 | break; | |
1727 | default: | |
1728 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1729 | } |
7e6f9ef6 MD |
1730 | return 0; |
1731 | } | |
1732 | ||
1733 | static | |
d1f652f8 MD |
1734 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1735 | .start = id_list_start, | |
1736 | .next = id_list_next, | |
1737 | .stop = id_list_stop, | |
1738 | .show = id_list_show, | |
7e6f9ef6 MD |
1739 | }; |
1740 | ||
1741 | static | |
d1f652f8 | 1742 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1743 | { |
d1f652f8 | 1744 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1745 | } |
1746 | ||
1747 | static | |
d1f652f8 | 1748 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1749 | { |
1750 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1751 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1752 | int ret; |
1753 | ||
d1f652f8 | 1754 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1755 | ret = seq_release(inode, file); |
d1f652f8 | 1756 | if (!ret) |
8c0393c3 | 1757 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1758 | return ret; |
1759 | } | |
1760 | ||
d1f652f8 | 1761 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1762 | .owner = THIS_MODULE, |
d1f652f8 | 1763 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1764 | .read = seq_read, |
1765 | .llseek = seq_lseek, | |
d1f652f8 | 1766 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1767 | }; |
1768 | ||
8cdc1a81 | 1769 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1770 | enum tracker_type tracker_type) |
7e6f9ef6 | 1771 | { |
d1f652f8 | 1772 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1773 | struct seq_file *m; |
1774 | int file_fd, ret; | |
1775 | ||
1776 | file_fd = lttng_get_unused_fd(); | |
1777 | if (file_fd < 0) { | |
1778 | ret = file_fd; | |
1779 | goto fd_error; | |
1780 | } | |
1781 | ||
d1f652f8 MD |
1782 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1783 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1784 | NULL, O_RDWR); |
d1f652f8 MD |
1785 | if (IS_ERR(tracker_ids_list_file)) { |
1786 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1787 | goto file_error; |
1788 | } | |
8cdc1a81 | 1789 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1790 | ret = -EOVERFLOW; |
9c1f4643 MD |
1791 | goto refcount_error; |
1792 | } | |
d1f652f8 | 1793 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1794 | if (ret < 0) |
1795 | goto open_error; | |
d1f652f8 MD |
1796 | m = tracker_ids_list_file->private_data; |
1797 | ||
1798 | m->private = get_tracker(session, tracker_type); | |
1799 | BUG_ON(!m->private); | |
1800 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1801 | |
1802 | return file_fd; | |
1803 | ||
1804 | open_error: | |
8cdc1a81 | 1805 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1806 | refcount_error: |
d1f652f8 | 1807 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1808 | file_error: |
1809 | put_unused_fd(file_fd); | |
1810 | fd_error: | |
1811 | return ret; | |
1812 | } | |
1813 | ||
3c997079 MD |
1814 | /* |
1815 | * Enabler management. | |
1816 | */ | |
1817 | static | |
4993071a PP |
1818 | int lttng_match_enabler_star_glob(const char *desc_name, |
1819 | const char *pattern) | |
3c997079 | 1820 | { |
cbc19040 MD |
1821 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1822 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1823 | return 0; |
1824 | return 1; | |
1825 | } | |
1826 | ||
1827 | static | |
4ecb5ad5 MD |
1828 | int lttng_match_enabler_name(const char *desc_name, |
1829 | const char *name) | |
3c997079 | 1830 | { |
4ecb5ad5 | 1831 | if (strcmp(desc_name, name)) |
3c997079 MD |
1832 | return 0; |
1833 | return 1; | |
1834 | } | |
1835 | ||
8bff0fc3 MD |
1836 | static |
1837 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1838 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1839 | { |
4ecb5ad5 | 1840 | const char *desc_name, *enabler_name; |
badfe9f5 | 1841 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1842 | |
1843 | enabler_name = enabler->event_param.name; | |
1844 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1845 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1846 | desc_name = desc->event_name; |
3b861b22 FD |
1847 | switch (enabler->format_type) { |
1848 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1849 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1850 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1851 | return lttng_match_enabler_name(desc_name, enabler_name); |
1852 | default: | |
1853 | return -EINVAL; | |
1854 | } | |
4ecb5ad5 | 1855 | break; |
b4a75708 | 1856 | |
606828e4 | 1857 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1858 | desc_name = desc->event_name; |
badfe9f5 | 1859 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1860 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1861 | compat = true; |
1862 | } | |
4ecb5ad5 MD |
1863 | if (!strncmp(desc_name, "syscall_exit_", |
1864 | strlen("syscall_exit_"))) { | |
1865 | desc_name += strlen("syscall_exit_"); | |
1866 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1867 | strlen("syscall_entry_"))) { | |
1868 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1869 | entry = true; |
4ecb5ad5 MD |
1870 | } else { |
1871 | WARN_ON_ONCE(1); | |
1872 | return -EINVAL; | |
1873 | } | |
badfe9f5 | 1874 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1875 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1876 | break; |
606828e4 | 1877 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1878 | if (!entry) |
1879 | return 0; | |
1880 | break; | |
606828e4 | 1881 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1882 | if (entry) |
1883 | return 0; | |
1884 | break; | |
1885 | default: | |
1886 | return -EINVAL; | |
1887 | } | |
1888 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1889 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1890 | break; |
606828e4 | 1891 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1892 | if (compat) |
1893 | return 0; | |
1894 | break; | |
606828e4 | 1895 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1896 | if (!compat) |
1897 | return 0; | |
1898 | break; | |
1899 | default: | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1903 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1904 | switch (enabler->format_type) { |
1905 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1906 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1907 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1908 | return lttng_match_enabler_name(desc_name, enabler_name); |
1909 | default: | |
1910 | return -EINVAL; | |
1911 | } | |
1912 | break; | |
606828e4 | 1913 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1914 | return -EINVAL; /* Not implemented. */ |
1915 | default: | |
1916 | return -EINVAL; | |
1917 | } | |
4ecb5ad5 | 1918 | break; |
b4a75708 | 1919 | |
4ecb5ad5 MD |
1920 | default: |
1921 | WARN_ON_ONCE(1); | |
1922 | return -EINVAL; | |
1923 | } | |
3c997079 MD |
1924 | } |
1925 | ||
8bff0fc3 MD |
1926 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1927 | struct lttng_event_enabler_common *enabler) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1932 | if (ret < 0) { | |
1933 | WARN_ON_ONCE(1); | |
1934 | return false; | |
1935 | } | |
1936 | return ret; | |
1937 | } | |
1938 | ||
5c6ec66a MD |
1939 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1940 | struct lttng_kernel_event_common *event) | |
3c997079 | 1941 | { |
5c6ec66a MD |
1942 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1943 | return false; | |
b2bc0bc8 | 1944 | |
5c6ec66a MD |
1945 | switch (event_enabler->enabler_type) { |
1946 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1947 | { | |
1948 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1949 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1950 | struct lttng_kernel_event_recorder *event_recorder = | |
1951 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1952 | ||
1953 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1954 | && event_recorder->chan == event_recorder_enabler->chan) | |
1955 | return true; | |
1956 | else | |
1957 | return false; | |
1958 | } | |
1959 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1960 | { | |
1961 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1962 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1963 | struct lttng_kernel_event_notifier *event_notifier = | |
1964 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1965 | ||
1966 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1967 | && event_notifier->priv->group == event_notifier_enabler->group | |
1968 | && event->priv->user_token == event_enabler->user_token) | |
1969 | return true; | |
1970 | else | |
1971 | return false; | |
1972 | } | |
1973 | default: | |
1974 | WARN_ON_ONCE(1); | |
1975 | return false; | |
1976 | } | |
3c997079 MD |
1977 | } |
1978 | ||
5c6ec66a MD |
1979 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1980 | const struct lttng_kernel_event_desc *desc, | |
1981 | struct lttng_kernel_event_common *event) | |
b01155ba | 1982 | { |
5c6ec66a MD |
1983 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1984 | return false; | |
b01155ba | 1985 | |
5c6ec66a MD |
1986 | switch (event_enabler->enabler_type) { |
1987 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1988 | { | |
1989 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1990 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1991 | struct lttng_kernel_event_recorder *event_recorder = | |
1992 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1993 | ||
1994 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1995 | return true; | |
1996 | else | |
1997 | return false; | |
1998 | } | |
1999 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2000 | { | |
2001 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2002 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2003 | struct lttng_kernel_event_notifier *event_notifier = | |
2004 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2005 | ||
2006 | if (event->priv->desc == desc | |
2007 | && event_notifier->priv->group == event_notifier_enabler->group | |
2008 | && event->priv->user_token == event_enabler->user_token) | |
2009 | return true; | |
2010 | else | |
2011 | return false; | |
2012 | } | |
2013 | default: | |
2014 | WARN_ON_ONCE(1); | |
2015 | return false; | |
2016 | } | |
b01155ba FD |
2017 | } |
2018 | ||
0d223dc6 MD |
2019 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2020 | const char *event_name, | |
2021 | struct lttng_kernel_event_common *event) | |
2022 | { | |
2023 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2024 | return false; | |
2025 | ||
2026 | switch (event_enabler->enabler_type) { | |
2027 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2028 | { | |
2029 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2030 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2031 | struct lttng_kernel_event_recorder *event_recorder = | |
2032 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2033 | ||
2034 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2035 | && event_recorder->chan == event_recorder_enabler->chan) | |
2036 | return true; | |
2037 | else | |
2038 | return false; | |
2039 | } | |
2040 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2041 | { | |
2042 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2043 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2044 | struct lttng_kernel_event_notifier *event_notifier = | |
2045 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2046 | ||
2047 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2048 | && event_notifier->priv->group == event_notifier_enabler->group | |
2049 | && event->priv->user_token == event_enabler->user_token) | |
2050 | return true; | |
2051 | else | |
2052 | return false; | |
2053 | } | |
2054 | default: | |
2055 | WARN_ON_ONCE(1); | |
2056 | return false; | |
2057 | } | |
2058 | } | |
2059 | ||
3c997079 | 2060 | static |
b2bc0bc8 FD |
2061 | struct lttng_enabler_ref *lttng_enabler_ref( |
2062 | struct list_head *enablers_ref_list, | |
8d554755 | 2063 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2064 | { |
2065 | struct lttng_enabler_ref *enabler_ref; | |
2066 | ||
b2bc0bc8 | 2067 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2068 | if (enabler_ref->ref == enabler) |
2069 | return enabler_ref; | |
2070 | } | |
2071 | return NULL; | |
2072 | } | |
2073 | ||
3c997079 | 2074 | static |
b2f63bde | 2075 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2076 | { |
c8e14380 | 2077 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2078 | struct lttng_kernel_probe_desc *probe_desc; |
2079 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2080 | struct list_head *probe_list; |
c8e14380 | 2081 | int i; |
3c997079 MD |
2082 | |
2083 | probe_list = lttng_get_probe_list_head(); | |
2084 | /* | |
2085 | * For each probe event, if we find that a probe event matches | |
2086 | * our enabler, create an associated lttng_event if not | |
2087 | * already present. | |
2088 | */ | |
2089 | list_for_each_entry(probe_desc, probe_list, head) { | |
2090 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2091 | bool found = false; |
3c997079 | 2092 | struct hlist_head *head; |
83006ee0 | 2093 | struct lttng_kernel_event_common *event; |
19bef247 | 2094 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2095 | |
2096 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2097 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2098 | continue; |
3c997079 MD |
2099 | |
2100 | /* | |
2101 | * Check if already created. | |
2102 | */ | |
0def9170 | 2103 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2104 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2105 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2106 | found = true; | |
2107 | break; | |
2108 | } | |
3c997079 MD |
2109 | } |
2110 | if (found) | |
2111 | continue; | |
2112 | ||
2113 | /* | |
83006ee0 | 2114 | * We need to create an event for this event probe. |
3c997079 | 2115 | */ |
c8e14380 | 2116 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2117 | if (IS_ERR(event)) { |
5a15f70c | 2118 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2119 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2120 | } |
2121 | } | |
2122 | } | |
2123 | } | |
2124 | ||
33a39a3c | 2125 | /* |
8839618b | 2126 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2127 | * Should be called with sessions mutex held. |
2128 | */ | |
2129 | static | |
b2f63bde | 2130 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2131 | { |
b2f63bde MD |
2132 | int ret; |
2133 | ||
8839618b | 2134 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2135 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2136 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2137 | break; |
b4a75708 | 2138 | |
606828e4 | 2139 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2140 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2141 | WARN_ON_ONCE(ret); | |
33a39a3c | 2142 | break; |
b4a75708 | 2143 | |
33a39a3c MD |
2144 | default: |
2145 | WARN_ON_ONCE(1); | |
2146 | break; | |
2147 | } | |
2148 | } | |
2149 | ||
d619fae9 MD |
2150 | static |
2151 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2152 | struct lttng_kernel_event_common *event) | |
2153 | { | |
2154 | /* Link filter bytecodes if not linked yet. */ | |
2155 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2156 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2157 | } | |
2158 | ||
1e06b222 MD |
2159 | static |
2160 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2161 | struct lttng_kernel_event_common *event) | |
2162 | { | |
2163 | switch (event_enabler->enabler_type) { | |
2164 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2165 | break; | |
2166 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2167 | { | |
2168 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2169 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2170 | struct lttng_kernel_event_notifier *event_notifier = | |
2171 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2172 | ||
2173 | /* Link capture bytecodes if not linked yet. */ | |
2174 | lttng_enabler_link_bytecode(event->priv->desc, | |
2175 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2176 | &event_notifier_enabler->capture_bytecode_head); | |
2177 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2178 | break; | |
2179 | } | |
2180 | default: | |
2181 | WARN_ON_ONCE(1); | |
2182 | } | |
2183 | } | |
2184 | ||
3c997079 | 2185 | /* |
b2bc0bc8 | 2186 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2187 | * and add backward reference from the event to the enabler. |
2188 | * Should be called with sessions mutex held. | |
2189 | */ | |
2190 | static | |
3622cd47 | 2191 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2192 | { |
3622cd47 MD |
2193 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2194 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2195 | |
3622cd47 | 2196 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2197 | |
3c997079 | 2198 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2199 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2200 | |
3622cd47 MD |
2201 | /* Link the created event with its associated enabler. */ |
2202 | list_for_each_entry(event_priv, event_list_head, node) { | |
2203 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2204 | struct lttng_enabler_ref *enabler_ref; |
2205 | ||
3622cd47 | 2206 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2207 | continue; |
2208 | ||
3622cd47 | 2209 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2210 | if (!enabler_ref) { |
2211 | /* | |
2212 | * If no backward ref, create it. | |
2213 | * Add backward ref from event_notifier to enabler. | |
2214 | */ | |
2215 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2216 | if (!enabler_ref) | |
2217 | return -ENOMEM; | |
2218 | ||
3622cd47 MD |
2219 | enabler_ref->ref = event_enabler; |
2220 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2221 | } |
2222 | ||
3622cd47 MD |
2223 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2224 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2225 | } |
2226 | return 0; | |
2227 | } | |
2228 | ||
3c997079 MD |
2229 | /* |
2230 | * Called at module load: connect the probe on all enablers matching | |
2231 | * this event. | |
2232 | * Called with sessions lock held. | |
2233 | */ | |
2234 | int lttng_fix_pending_events(void) | |
2235 | { | |
8cdc1a81 | 2236 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2237 | |
8cdc1a81 MD |
2238 | list_for_each_entry(session_priv, &sessions, list) |
2239 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2240 | return 0; |
2241 | } | |
2242 | ||
b01155ba FD |
2243 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2244 | struct lttng_event_notifier_group *event_notifier_group) | |
2245 | { | |
09710b83 | 2246 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2247 | |
09710b83 MD |
2248 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2249 | if (event_enabler->enabled) | |
b01155ba FD |
2250 | return true; |
2251 | } | |
2252 | return false; | |
2253 | } | |
2254 | ||
2255 | bool lttng_event_notifier_active(void) | |
2256 | { | |
2257 | struct lttng_event_notifier_group *event_notifier_group; | |
2258 | ||
2259 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2260 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2261 | return true; | |
2262 | } | |
2263 | return false; | |
2264 | } | |
2265 | ||
2266 | int lttng_fix_pending_event_notifiers(void) | |
2267 | { | |
2268 | struct lttng_event_notifier_group *event_notifier_group; | |
2269 | ||
2270 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2271 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2272 | return 0; | |
2273 | } | |
2274 | ||
1ae083ba | 2275 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2276 | enum lttng_enabler_format_type format_type, |
606828e4 | 2277 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2278 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2279 | { |
1ae083ba | 2280 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2281 | |
b2bc0bc8 FD |
2282 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2283 | if (!event_enabler) | |
3c997079 | 2284 | return NULL; |
0bb716a8 | 2285 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2286 | event_enabler->parent.format_type = format_type; |
2287 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2288 | memcpy(&event_enabler->parent.event_param, event_param, | |
2289 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2290 | event_enabler->chan = chan; |
3c997079 | 2291 | /* ctx left NULL */ |
5b9817ae | 2292 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2293 | return event_enabler; |
2294 | } | |
2295 | ||
2296 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2297 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2298 | { |
3c997079 | 2299 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2300 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2301 | event_enabler->parent.published = true; | |
def1e304 | 2302 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2303 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2304 | } |
2305 | ||
7b25ab0e | 2306 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2307 | { |
2308 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2309 | event_enabler->enabled = 1; |
2310 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2311 | mutex_unlock(&sessions_mutex); |
2312 | return 0; | |
2313 | } | |
2314 | ||
7b25ab0e | 2315 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2316 | { |
2317 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2318 | event_enabler->enabled = 0; |
2319 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2320 | mutex_unlock(&sessions_mutex); |
2321 | return 0; | |
2322 | } | |
2323 | ||
b2bc0bc8 | 2324 | static |
8d554755 | 2325 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2326 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2327 | { |
d64ca521 | 2328 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2329 | uint32_t bytecode_len; |
2330 | int ret; | |
2331 | ||
2332 | ret = get_user(bytecode_len, &bytecode->len); | |
2333 | if (ret) | |
2334 | return ret; | |
52cfcdf3 | 2335 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2336 | GFP_KERNEL); |
2337 | if (!bytecode_node) | |
2338 | return -ENOMEM; | |
2339 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2340 | sizeof(*bytecode) + bytecode_len); | |
2341 | if (ret) | |
2342 | goto error_free; | |
b2bc0bc8 | 2343 | |
8a445457 | 2344 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2345 | bytecode_node->enabler = enabler; |
2346 | /* Enforce length based on allocated size */ | |
2347 | bytecode_node->bc.len = bytecode_len; | |
2348 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2349 | |
07dfc1d0 MD |
2350 | return 0; |
2351 | ||
2352 | error_free: | |
52cfcdf3 | 2353 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2354 | return ret; |
2355 | } | |
2356 | ||
6048044f | 2357 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2358 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2359 | { |
2360 | int ret; | |
6048044f | 2361 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2362 | if (ret) |
2363 | goto error; | |
7b25ab0e | 2364 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2365 | return 0; |
2366 | ||
2367 | error: | |
2368 | return ret; | |
2369 | } | |
2370 | ||
e2d5dbc7 | 2371 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2372 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2373 | { |
2374 | ||
e2d5dbc7 | 2375 | switch (event->priv->instrumentation) { |
606828e4 | 2376 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2377 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2378 | default: |
2379 | return -EINVAL; | |
2380 | } | |
2381 | } | |
2382 | ||
3c997079 | 2383 | static |
8d554755 | 2384 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2385 | { |
d64ca521 | 2386 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2387 | |
2388 | /* Destroy filter bytecode */ | |
2389 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2390 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2391 | lttng_kvfree(filter_node); |
07dfc1d0 | 2392 | } |
b2bc0bc8 FD |
2393 | } |
2394 | ||
44b1abdc | 2395 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2396 | { |
09710b83 MD |
2397 | lttng_enabler_destroy(event_enabler); |
2398 | if (event_enabler->published) | |
2399 | list_del(&event_enabler->node); | |
2400 | ||
44b1abdc MD |
2401 | switch (event_enabler->enabler_type) { |
2402 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2403 | { | |
2404 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2405 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2406 | ||
44b1abdc MD |
2407 | kfree(event_recorder_enabler); |
2408 | break; | |
2409 | } | |
2410 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2411 | { | |
2412 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2413 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2414 | |
44b1abdc MD |
2415 | kfree(event_notifier_enabler); |
2416 | break; | |
2417 | } | |
2418 | default: | |
2419 | WARN_ON_ONCE(1); | |
2420 | } | |
3c997079 MD |
2421 | } |
2422 | ||
dffef45d | 2423 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2424 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2425 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2426 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2427 | { |
2428 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2429 | ||
2430 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2431 | if (!event_notifier_enabler) | |
2432 | return NULL; | |
2433 | ||
0bb716a8 | 2434 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2435 | event_notifier_enabler->parent.format_type = format_type; |
2436 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2437 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2438 | ||
99f52fcc | 2439 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2440 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2441 | |
5b9817ae MD |
2442 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2443 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2444 | |
5b9817ae MD |
2445 | event_notifier_enabler->parent.enabled = 0; |
2446 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2447 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2448 | return event_notifier_enabler; |
2449 | } | |
dffef45d | 2450 | |
1bbb5b2d MD |
2451 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2452 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2453 | { | |
dffef45d | 2454 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2455 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2456 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2457 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2458 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2459 | } |
2460 | ||
2461 | int lttng_event_notifier_enabler_enable( | |
2462 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2463 | { | |
2464 | mutex_lock(&sessions_mutex); | |
2465 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2466 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2467 | mutex_unlock(&sessions_mutex); |
2468 | return 0; | |
2469 | } | |
2470 | ||
2471 | int lttng_event_notifier_enabler_disable( | |
2472 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2473 | { | |
2474 | mutex_lock(&sessions_mutex); | |
2475 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2476 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2477 | mutex_unlock(&sessions_mutex); |
2478 | return 0; | |
2479 | } | |
2480 | ||
99d223ad FD |
2481 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2482 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2483 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2484 | { |
d64ca521 | 2485 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2486 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2487 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2488 | uint32_t bytecode_len; | |
2489 | int ret; | |
2490 | ||
2491 | ret = get_user(bytecode_len, &bytecode->len); | |
2492 | if (ret) | |
2493 | return ret; | |
2494 | ||
2495 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2496 | GFP_KERNEL); | |
2497 | if (!bytecode_node) | |
2498 | return -ENOMEM; | |
2499 | ||
2500 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2501 | sizeof(*bytecode) + bytecode_len); | |
2502 | if (ret) | |
2503 | goto error_free; | |
2504 | ||
8a445457 | 2505 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2506 | bytecode_node->enabler = enabler; |
2507 | ||
2508 | /* Enforce length based on allocated size */ | |
2509 | bytecode_node->bc.len = bytecode_len; | |
2510 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2511 | ||
2512 | event_notifier_enabler->num_captures++; | |
2513 | ||
2514 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2515 | goto end; | |
2516 | ||
2517 | error_free: | |
2518 | lttng_kvfree(bytecode_node); | |
2519 | end: | |
2520 | return ret; | |
2521 | } | |
2522 | ||
cc5719b1 MD |
2523 | static |
2524 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2525 | { | |
2526 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2527 | struct lttng_kernel_bytecode_runtime *runtime; | |
2528 | struct lttng_enabler_ref *enabler_ref; | |
2529 | ||
2530 | /* Check if has enablers without bytecode enabled */ | |
2531 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2532 | if (enabler_ref->ref->enabled | |
2533 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2534 | has_enablers_without_filter_bytecode = 1; | |
2535 | break; | |
2536 | } | |
2537 | } | |
2538 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2539 | ||
2540 | /* Enable filters */ | |
2541 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2542 | lttng_bytecode_sync_state(runtime); | |
2543 | nr_filters++; | |
2544 | } | |
2545 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2546 | } | |
2547 | ||
2548 | static | |
2549 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2550 | { | |
2551 | switch (event->type) { | |
2552 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2553 | break; | |
2554 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2555 | { | |
2556 | struct lttng_kernel_event_notifier *event_notifier = | |
2557 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2558 | struct lttng_kernel_bytecode_runtime *runtime; | |
2559 | int nr_captures = 0; | |
2560 | ||
2561 | /* Enable captures */ | |
2562 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2563 | lttng_bytecode_sync_state(runtime); | |
2564 | nr_captures++; | |
2565 | } | |
2566 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2567 | break; | |
2568 | } | |
2569 | default: | |
2570 | WARN_ON_ONCE(1); | |
2571 | } | |
2572 | } | |
2573 | ||
a0c6ad2e MD |
2574 | static |
2575 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2576 | { | |
2577 | struct lttng_enabler_ref *enabler_ref; | |
2578 | bool enabled = false; | |
2579 | ||
2580 | switch (event->priv->instrumentation) { | |
2581 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2582 | lttng_fallthrough; | |
2583 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2584 | /* Enable events */ | |
2585 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2586 | if (enabler_ref->ref->enabled) { | |
2587 | enabled = true; | |
2588 | break; | |
2589 | } | |
2590 | } | |
2591 | break; | |
2592 | default: | |
2593 | WARN_ON_ONCE(1); | |
2594 | return false; | |
2595 | } | |
2596 | ||
2597 | switch (event->type) { | |
2598 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2599 | { | |
2600 | struct lttng_kernel_event_recorder *event_recorder = | |
2601 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2602 | ||
2603 | /* | |
2604 | * Enabled state is based on union of enablers, with | |
2605 | * intersection of session and channel transient enable | |
2606 | * states. | |
2607 | */ | |
2608 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2609 | } | |
2610 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2611 | return enabled; | |
2612 | default: | |
2613 | WARN_ON_ONCE(1); | |
2614 | return false; | |
2615 | } | |
2616 | } | |
2617 | ||
2618 | static | |
2619 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2620 | { | |
2621 | switch (event->priv->instrumentation) { | |
2622 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2623 | lttng_fallthrough; | |
2624 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2625 | return true; | |
2626 | ||
2627 | default: | |
2628 | /* Not handled with lazy sync. */ | |
2629 | return false; | |
2630 | } | |
2631 | } | |
2632 | ||
3c997079 | 2633 | /* |
3c997079 MD |
2634 | * Should be called with sessions mutex held. |
2635 | */ | |
2636 | static | |
a0c6ad2e MD |
2637 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2638 | struct list_head *event_list) | |
3c997079 | 2639 | { |
a0c6ad2e | 2640 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2641 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2642 | |
a0c6ad2e | 2643 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2644 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2645 | |
3c997079 MD |
2646 | /* |
2647 | * For each event, if at least one of its enablers is enabled, | |
2648 | * and its channel and session transient states are enabled, we | |
2649 | * enable the event, else we disable it. | |
2650 | */ | |
a0c6ad2e MD |
2651 | list_for_each_entry(event_priv, event_list, node) { |
2652 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2653 | bool enabled; | |
b4a75708 | 2654 | |
a0c6ad2e | 2655 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2656 | continue; |
3c997079 | 2657 | |
a0c6ad2e MD |
2658 | enabled = lttng_get_event_enabled_state(event); |
2659 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2660 | /* |
a0c6ad2e | 2661 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2662 | */ |
2663 | if (enabled) { | |
6a338ba4 MD |
2664 | if (!event_priv->registered) |
2665 | register_event(event); | |
3c997079 | 2666 | } else { |
6a338ba4 MD |
2667 | if (event_priv->registered) |
2668 | unregister_event(event); | |
3c997079 | 2669 | } |
07dfc1d0 | 2670 | |
a0c6ad2e MD |
2671 | lttng_event_sync_filter_state(event); |
2672 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2673 | } |
2674 | } | |
2675 | ||
a0c6ad2e MD |
2676 | /* |
2677 | * lttng_session_sync_event_enablers should be called just before starting a | |
2678 | * session. | |
2679 | */ | |
2680 | static | |
2681 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2682 | { | |
2683 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2684 | } | |
2685 | ||
3c997079 MD |
2686 | /* |
2687 | * Apply enablers to session events, adding events to session if need | |
2688 | * be. It is required after each modification applied to an active | |
2689 | * session, and right before session "start". | |
2690 | * "lazy" sync means we only sync if required. | |
2691 | * Should be called with sessions mutex held. | |
2692 | */ | |
2693 | static | |
8cdc1a81 | 2694 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2695 | { |
2696 | /* We can skip if session is not active */ | |
2697 | if (!session->active) | |
2698 | return; | |
b2bc0bc8 | 2699 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2700 | } |
2701 | ||
b01155ba FD |
2702 | static |
2703 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2704 | { | |
a0c6ad2e | 2705 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2706 | } |
2707 | ||
7b25ab0e MD |
2708 | static |
2709 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2710 | { | |
2711 | switch (event_enabler->enabler_type) { | |
2712 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2713 | { | |
2714 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2715 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2716 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2717 | break; | |
2718 | } | |
2719 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2720 | { | |
2721 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2722 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2723 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2724 | break; | |
2725 | } | |
2726 | default: | |
2727 | WARN_ON_ONCE(1); | |
2728 | } | |
2729 | } | |
2730 | ||
1ec3f75a | 2731 | /* |
d83004aa JD |
2732 | * Serialize at most one packet worth of metadata into a metadata |
2733 | * channel. | |
92d9f5e6 MD |
2734 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2735 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2736 | * allows us to do racy operations such as looking for remaining space left in | |
2737 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2738 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2739 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2740 | * Returns the number of bytes written in the channel, 0 if no data |
2741 | * was written and a negative value on error. | |
1ec3f75a | 2742 | */ |
b3b8072b | 2743 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2744 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2745 | { |
8a57ec02 | 2746 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2747 | int ret = 0; |
2748 | size_t len, reserve_len; | |
2749 | ||
f613e3e6 | 2750 | /* |
92d9f5e6 MD |
2751 | * Ensure we support mutiple get_next / put sequences followed by |
2752 | * put_next. The metadata cache lock protects reading the metadata | |
2753 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2754 | * "flush" operations on the buffer invoked by different processes. | |
2755 | * Moreover, since the metadata cache memory can be reallocated, we | |
2756 | * need to have exclusive access against updates even though we only | |
2757 | * read it. | |
f613e3e6 | 2758 | */ |
92d9f5e6 | 2759 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2760 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2761 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2762 | goto end; |
f613e3e6 | 2763 | |
9616f0bf JD |
2764 | /* Metadata regenerated, change the version. */ |
2765 | if (stream->metadata_cache->version != stream->version) | |
2766 | stream->version = stream->metadata_cache->version; | |
2767 | ||
d83004aa | 2768 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2769 | stream->metadata_in; |
9de2c215 | 2770 | if (!len) |
de23d59d | 2771 | goto end; |
d83004aa | 2772 | reserve_len = min_t(size_t, |
4a399b76 | 2773 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2774 | len); |
a775608d | 2775 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2776 | sizeof(char), NULL); |
d83004aa JD |
2777 | /* |
2778 | * If reservation failed, return an error to the caller. | |
2779 | */ | |
c2fb9c1c | 2780 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2781 | if (ret != 0) { |
2782 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2783 | stream->coherent = false; |
d83004aa JD |
2784 | goto end; |
2785 | } | |
b3b8072b | 2786 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2787 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2788 | reserve_len, 1); |
b3b8072b | 2789 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2790 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2791 | if (reserve_len < len) |
8b97fd42 MD |
2792 | stream->coherent = false; |
2793 | else | |
2794 | stream->coherent = true; | |
d83004aa JD |
2795 | ret = reserve_len; |
2796 | ||
2797 | end: | |
8b97fd42 MD |
2798 | if (coherent) |
2799 | *coherent = stream->coherent; | |
92d9f5e6 | 2800 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2801 | return ret; |
2802 | } | |
2803 | ||
8b97fd42 | 2804 | static |
8cdc1a81 | 2805 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2806 | { |
8cdc1a81 MD |
2807 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2808 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2809 | } |
2810 | ||
2811 | static | |
8cdc1a81 | 2812 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2813 | { |
8cdc1a81 MD |
2814 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2815 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2816 | struct lttng_metadata_stream *stream; |
2817 | ||
8cdc1a81 | 2818 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2819 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2820 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2821 | } |
8b97fd42 MD |
2822 | } |
2823 | ||
d83004aa JD |
2824 | /* |
2825 | * Write the metadata to the metadata cache. | |
2826 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2827 | * The metadata cache lock protects us from concurrent read access from |
2828 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2829 | * The content of the printf is printed as a single atomic metadata |
2830 | * transaction. | |
d83004aa | 2831 | */ |
8cdc1a81 | 2832 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2833 | const char *fmt, ...) |
2834 | { | |
c099397a | 2835 | char *str; |
d83004aa | 2836 | size_t len; |
c099397a MD |
2837 | va_list ap; |
2838 | ||
585e5dcc | 2839 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2840 | |
2841 | va_start(ap, fmt); | |
2842 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2843 | va_end(ap); | |
2844 | if (!str) | |
2845 | return -ENOMEM; | |
2846 | ||
1ec3f75a | 2847 | len = strlen(str); |
8cdc1a81 MD |
2848 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2849 | if (session->priv->metadata_cache->metadata_written + len > | |
2850 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2851 | char *tmp_cache_realloc; |
2852 | unsigned int tmp_cache_alloc_size; | |
2853 | ||
2854 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2855 | session->priv->metadata_cache->cache_alloc + len, |
2856 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2857 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2858 | if (!tmp_cache_realloc) |
2859 | goto err; | |
8cdc1a81 | 2860 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2861 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2862 | session->priv->metadata_cache->data, |
2863 | session->priv->metadata_cache->cache_alloc); | |
2864 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2865 | } |
2866 | ||
8cdc1a81 MD |
2867 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2868 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2869 | } |
8cdc1a81 MD |
2870 | memcpy(session->priv->metadata_cache->data + |
2871 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2872 | str, len); |
8cdc1a81 | 2873 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2874 | kfree(str); |
d83004aa | 2875 | |
d83004aa JD |
2876 | return 0; |
2877 | ||
2878 | err: | |
2879 | kfree(str); | |
2880 | return -ENOMEM; | |
c099397a MD |
2881 | } |
2882 | ||
f513b2bf | 2883 | static |
8cdc1a81 | 2884 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2885 | { |
2886 | size_t i; | |
2887 | ||
2888 | for (i = 0; i < nesting; i++) { | |
2889 | int ret; | |
2890 | ||
2891 | ret = lttng_metadata_printf(session, " "); | |
2892 | if (ret) { | |
2893 | return ret; | |
2894 | } | |
2895 | } | |
2896 | return 0; | |
2897 | } | |
2898 | ||
ceabb767 | 2899 | static |
8cdc1a81 | 2900 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2901 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2902 | size_t nesting) |
2903 | { | |
2904 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2905 | } | |
2906 | ||
2907 | static | |
8cdc1a81 | 2908 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2909 | const struct lttng_kernel_type_integer *type, |
2910 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2911 | size_t nesting) |
2912 | { | |
2913 | int ret; | |
2914 | ||
ceabb767 MD |
2915 | ret = print_tabs(session, nesting); |
2916 | if (ret) | |
2917 | return ret; | |
2918 | ret = lttng_metadata_printf(session, | |
2919 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2920 | type->size, |
2921 | type->alignment, | |
2922 | type->signedness, | |
2923 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2924 | ? "none" |
437d5aa5 | 2925 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2926 | ? "UTF8" |
2927 | : "ASCII", | |
437d5aa5 | 2928 | type->base, |
ceabb767 | 2929 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2930 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2931 | #else |
437d5aa5 | 2932 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2933 | #endif |
2934 | ); | |
2935 | return ret; | |
2936 | } | |
2937 | ||
f513b2bf MD |
2938 | /* |
2939 | * Must be called with sessions_mutex held. | |
2940 | */ | |
2941 | static | |
8cdc1a81 | 2942 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2943 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2944 | size_t nesting) |
2945 | { | |
51ef4536 | 2946 | const char *prev_field_name = NULL; |
f513b2bf MD |
2947 | int ret; |
2948 | uint32_t i, nr_fields; | |
ceabb767 MD |
2949 | unsigned int alignment; |
2950 | ||
f513b2bf MD |
2951 | ret = print_tabs(session, nesting); |
2952 | if (ret) | |
2953 | return ret; | |
2954 | ret = lttng_metadata_printf(session, | |
2955 | "struct {\n"); | |
2956 | if (ret) | |
2957 | return ret; | |
437d5aa5 | 2958 | nr_fields = type->nr_fields; |
f513b2bf | 2959 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2960 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2961 | |
437d5aa5 | 2962 | iter_field = type->fields[i]; |
51ef4536 | 2963 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2964 | if (ret) |
2965 | return ret; | |
2966 | } | |
2967 | ret = print_tabs(session, nesting); | |
2968 | if (ret) | |
2969 | return ret; | |
437d5aa5 | 2970 | alignment = type->alignment; |
ceabb767 MD |
2971 | if (alignment) { |
2972 | ret = lttng_metadata_printf(session, | |
2973 | "} align(%u)", | |
2974 | alignment); | |
2975 | } else { | |
2976 | ret = lttng_metadata_printf(session, | |
2977 | "}"); | |
2978 | } | |
f513b2bf MD |
2979 | return ret; |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Must be called with sessions_mutex held. | |
2984 | */ | |
2985 | static | |
8cdc1a81 | 2986 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2987 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2988 | size_t nesting) |
2989 | { | |
2990 | int ret; | |
2991 | ||
2992 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2993 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2994 | if (ret) |
2995 | return ret; | |
ceabb767 | 2996 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2997 | } |
2998 | ||
65c85aa6 MD |
2999 | /* |
3000 | * Must be called with sessions_mutex held. | |
3001 | */ | |
3002 | static | |
8cdc1a81 | 3003 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3004 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3005 | size_t nesting, |
3006 | const char *prev_field_name) | |
65c85aa6 | 3007 | { |
51ef4536 | 3008 | const char *tag_name; |
65c85aa6 MD |
3009 | int ret; |
3010 | uint32_t i, nr_choices; | |
3011 | ||
51ef4536 MD |
3012 | tag_name = type->tag_name; |
3013 | if (!tag_name) | |
3014 | tag_name = prev_field_name; | |
3015 | if (!tag_name) | |
3016 | return -EINVAL; | |
ceabb767 MD |
3017 | /* |
3018 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3019 | */ | |
437d5aa5 | 3020 | if (type->alignment != 0) |
ceabb767 | 3021 | return -EINVAL; |
65c85aa6 MD |
3022 | ret = print_tabs(session, nesting); |
3023 | if (ret) | |
3024 | return ret; | |
3025 | ret = lttng_metadata_printf(session, | |
3026 | "variant <_%s> {\n", | |
51ef4536 | 3027 | tag_name); |
65c85aa6 MD |
3028 | if (ret) |
3029 | return ret; | |
437d5aa5 | 3030 | nr_choices = type->nr_choices; |
65c85aa6 | 3031 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3032 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3033 | |
437d5aa5 | 3034 | iter_field = type->choices[i]; |
51ef4536 | 3035 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3036 | if (ret) |
3037 | return ret; | |
3038 | } | |
3039 | ret = print_tabs(session, nesting); | |
3040 | if (ret) | |
3041 | return ret; | |
3042 | ret = lttng_metadata_printf(session, | |
3043 | "}"); | |
3044 | return ret; | |
3045 | } | |
3046 | ||
3047 | /* | |
3048 | * Must be called with sessions_mutex held. | |
3049 | */ | |
3050 | static | |
8cdc1a81 | 3051 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3052 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3053 | size_t nesting, |
3054 | const char *prev_field_name) | |
65c85aa6 MD |
3055 | { |
3056 | int ret; | |
3057 | ||
3058 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3059 | lttng_kernel_get_type_variant(field->type), nesting, |
3060 | prev_field_name); | |
65c85aa6 MD |
3061 | if (ret) |
3062 | return ret; | |
ceabb767 | 3063 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3064 | } |
3065 | ||
f513b2bf MD |
3066 | /* |
3067 | * Must be called with sessions_mutex held. | |
3068 | */ | |
3069 | static | |
8cdc1a81 | 3070 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3071 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3072 | size_t nesting) |
3073 | { | |
3074 | int ret; | |
437d5aa5 MD |
3075 | const struct lttng_kernel_type_array *array_type; |
3076 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3077 | |
437d5aa5 MD |
3078 | array_type = lttng_kernel_get_type_array(field->type); |
3079 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3080 | |
437d5aa5 | 3081 | if (array_type->alignment) { |
ceabb767 | 3082 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3083 | if (ret) |
3084 | return ret; | |
ceabb767 MD |
3085 | ret = lttng_metadata_printf(session, |
3086 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3087 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3088 | field->name); |
3089 | if (ret) | |
3090 | return ret; | |
3091 | } | |
3092 | /* | |
3093 | * Nested compound types: Only array of structures and variants are | |
3094 | * currently supported. | |
3095 | */ | |
437d5aa5 | 3096 | elem_type = array_type->elem_type; |
12bb2edb MD |
3097 | switch (elem_type->type) { |
3098 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3099 | case lttng_kernel_type_struct: |
3100 | case lttng_kernel_type_variant: | |
3101 | ret = _lttng_type_statedump(session, elem_type, | |
3102 | array_type->encoding, nesting); | |
65c85aa6 MD |
3103 | if (ret) |
3104 | return ret; | |
3105 | break; | |
ceabb767 | 3106 | |
f513b2bf MD |
3107 | default: |
3108 | return -EINVAL; | |
3109 | } | |
3110 | ret = lttng_metadata_printf(session, | |
3111 | " _%s[%u];\n", | |
3112 | field->name, | |
437d5aa5 | 3113 | array_type->length); |
f513b2bf MD |
3114 | return ret; |
3115 | } | |
3116 | ||
3117 | /* | |
3118 | * Must be called with sessions_mutex held. | |
3119 | */ | |
3120 | static | |
8cdc1a81 | 3121 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3122 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3123 | size_t nesting, |
3124 | const char *prev_field_name) | |
f513b2bf MD |
3125 | { |
3126 | int ret; | |
3127 | const char *length_name; | |
437d5aa5 MD |
3128 | const struct lttng_kernel_type_sequence *sequence_type; |
3129 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3130 | |
437d5aa5 MD |
3131 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3132 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3133 | |
437d5aa5 | 3134 | length_name = sequence_type->length_name; |
51ef4536 MD |
3135 | if (!length_name) |
3136 | length_name = prev_field_name; | |
3137 | if (!length_name) | |
3138 | return -EINVAL; | |
ceabb767 | 3139 | |
437d5aa5 | 3140 | if (sequence_type->alignment) { |
ceabb767 | 3141 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3142 | if (ret) |
3143 | return ret; | |
ceabb767 MD |
3144 | ret = lttng_metadata_printf(session, |
3145 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3146 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3147 | field->name); |
3148 | if (ret) | |
3149 | return ret; | |
3150 | } | |
3151 | ||
3152 | /* | |
3153 | * Nested compound types: Only array of structures and variants are | |
3154 | * currently supported. | |
3155 | */ | |
437d5aa5 | 3156 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3157 | switch (elem_type->type) { |
3158 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3159 | case lttng_kernel_type_struct: |
3160 | case lttng_kernel_type_variant: | |
3161 | ret = _lttng_type_statedump(session, elem_type, | |
3162 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3163 | if (ret) |
3164 | return ret; | |
3165 | break; | |
ceabb767 | 3166 | |
f513b2bf MD |
3167 | default: |
3168 | return -EINVAL; | |
3169 | } | |
3170 | ret = lttng_metadata_printf(session, | |
3171 | " _%s[ _%s ];\n", | |
3172 | field->name, | |
51ef4536 | 3173 | length_name); |
f513b2bf MD |
3174 | return ret; |
3175 | } | |
3176 | ||
141ddf28 MD |
3177 | /* |
3178 | * Must be called with sessions_mutex held. | |
3179 | */ | |
3180 | static | |
8cdc1a81 | 3181 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3182 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3183 | size_t nesting) |
3184 | { | |
d96a4a7a | 3185 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3186 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3187 | int ret; |
3188 | unsigned int i, nr_entries; | |
3189 | ||
437d5aa5 | 3190 | container_type = type->container_type; |
12bb2edb | 3191 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3192 | ret = -EINVAL; |
3193 | goto end; | |
3194 | } | |
437d5aa5 | 3195 | enum_desc = type->desc; |
141ddf28 MD |
3196 | nr_entries = enum_desc->nr_entries; |
3197 | ||
3198 | ret = print_tabs(session, nesting); | |
3199 | if (ret) | |
3200 | goto end; | |
ceabb767 MD |
3201 | ret = lttng_metadata_printf(session, "enum : "); |
3202 | if (ret) | |
3203 | goto end; | |
437d5aa5 MD |
3204 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3205 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3206 | if (ret) |
ceabb767 MD |
3207 | goto end; |
3208 | ret = lttng_metadata_printf(session, " {\n"); | |
3209 | if (ret) | |
3210 | goto end; | |
141ddf28 MD |
3211 | /* Dump all entries */ |
3212 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3213 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3214 | int j, len; |
3215 | ||
3216 | ret = print_tabs(session, nesting + 1); | |
3217 | if (ret) | |
3218 | goto end; | |
3219 | ret = lttng_metadata_printf(session, | |
3220 | "\""); | |
3221 | if (ret) | |
3222 | goto end; | |
3223 | len = strlen(entry->string); | |
3224 | /* Escape the character '"' */ | |
3225 | for (j = 0; j < len; j++) { | |
3226 | char c = entry->string[j]; | |
3227 | ||
3228 | switch (c) { | |
3229 | case '"': | |
3230 | ret = lttng_metadata_printf(session, | |
3231 | "\\\""); | |
3232 | break; | |
3233 | case '\\': | |
3234 | ret = lttng_metadata_printf(session, | |
3235 | "\\\\"); | |
3236 | break; | |
3237 | default: | |
3238 | ret = lttng_metadata_printf(session, | |
3239 | "%c", c); | |
3240 | break; | |
3241 | } | |
3242 | if (ret) | |
3243 | goto end; | |
3244 | } | |
08ad1061 PP |
3245 | ret = lttng_metadata_printf(session, "\""); |
3246 | if (ret) | |
3247 | goto end; | |
3248 | ||
3249 | if (entry->options.is_auto) { | |
3250 | ret = lttng_metadata_printf(session, ",\n"); | |
3251 | if (ret) | |
3252 | goto end; | |
141ddf28 | 3253 | } else { |
7c559490 MD |
3254 | ret = lttng_metadata_printf(session, |
3255 | " = "); | |
3256 | if (ret) | |
3257 | goto end; | |
3258 | if (entry->start.signedness) | |
141ddf28 | 3259 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3260 | "%lld", (long long) entry->start.value); |
3261 | else | |
3262 | ret = lttng_metadata_printf(session, | |
3263 | "%llu", entry->start.value); | |
3264 | if (ret) | |
3265 | goto end; | |
3266 | if (entry->start.signedness == entry->end.signedness && | |
3267 | entry->start.value | |
3268 | == entry->end.value) { | |
141ddf28 | 3269 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3270 | ",\n"); |
3271 | } else { | |
3272 | if (entry->end.signedness) { | |
3273 | ret = lttng_metadata_printf(session, | |
3274 | " ... %lld,\n", | |
3275 | (long long) entry->end.value); | |
3276 | } else { | |
3277 | ret = lttng_metadata_printf(session, | |
3278 | " ... %llu,\n", | |
3279 | entry->end.value); | |
3280 | } | |
141ddf28 | 3281 | } |
7c559490 MD |
3282 | if (ret) |
3283 | goto end; | |
141ddf28 | 3284 | } |
141ddf28 MD |
3285 | } |
3286 | ret = print_tabs(session, nesting); | |
3287 | if (ret) | |
3288 | goto end; | |
ceabb767 | 3289 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3290 | end: |
3291 | return ret; | |
3292 | } | |
3293 | ||
d83004aa JD |
3294 | /* |
3295 | * Must be called with sessions_mutex held. | |
3296 | */ | |
c099397a | 3297 | static |
8cdc1a81 | 3298 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3299 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3300 | size_t nesting) |
3301 | { | |
3302 | int ret; | |
437d5aa5 | 3303 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3304 | |
437d5aa5 MD |
3305 | enum_type = lttng_kernel_get_type_enum(field->type); |
3306 | WARN_ON_ONCE(!enum_type); | |
3307 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3308 | if (ret) |
3309 | return ret; | |
3310 | return lttng_field_name_statedump(session, field, nesting); | |
3311 | } | |
3312 | ||
3313 | static | |
8cdc1a81 | 3314 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3315 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3316 | size_t nesting) |
3317 | { | |
3318 | int ret; | |
3319 | ||
437d5aa5 MD |
3320 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3321 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3322 | if (ret) |
3323 | return ret; | |
3324 | return lttng_field_name_statedump(session, field, nesting); | |
3325 | } | |
3326 | ||
3327 | static | |
8cdc1a81 | 3328 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3329 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3330 | size_t nesting) |
3331 | { | |
3332 | int ret; | |
3333 | ||
ceabb767 MD |
3334 | /* Default encoding is UTF8 */ |
3335 | ret = print_tabs(session, nesting); | |
3336 | if (ret) | |
3337 | return ret; | |
3338 | ret = lttng_metadata_printf(session, | |
3339 | "string%s", | |
437d5aa5 | 3340 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3341 | " { encoding = ASCII; }" : ""); |
3342 | return ret; | |
3343 | } | |
3344 | ||
3345 | static | |
8cdc1a81 | 3346 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3347 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3348 | size_t nesting) |
ceabb767 | 3349 | { |
437d5aa5 | 3350 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3351 | int ret; |
3352 | ||
437d5aa5 MD |
3353 | string_type = lttng_kernel_get_type_string(field->type); |
3354 | WARN_ON_ONCE(!string_type); | |
3355 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3356 | if (ret) |
3357 | return ret; | |
3358 | return lttng_field_name_statedump(session, field, nesting); | |
3359 | } | |
3360 | ||
3361 | /* | |
3362 | * Must be called with sessions_mutex held. | |
3363 | */ | |
3364 | static | |
8cdc1a81 | 3365 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3366 | const struct lttng_kernel_type_common *type, |
3367 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3368 | size_t nesting) |
c099397a | 3369 | { |
c099397a | 3370 | int ret = 0; |
c099397a | 3371 | |
12bb2edb MD |
3372 | switch (type->type) { |
3373 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3374 | ret = _lttng_integer_type_statedump(session, |
3375 | lttng_kernel_get_type_integer(type), | |
3376 | parent_encoding, nesting); | |
8070f5c0 | 3377 | break; |
437d5aa5 MD |
3378 | case lttng_kernel_type_enum: |
3379 | ret = _lttng_enum_type_statedump(session, | |
3380 | lttng_kernel_get_type_enum(type), | |
3381 | nesting); | |
8070f5c0 | 3382 | break; |
12bb2edb | 3383 | case lttng_kernel_type_string: |
437d5aa5 MD |
3384 | ret = _lttng_string_type_statedump(session, |
3385 | lttng_kernel_get_type_string(type), | |
3386 | nesting); | |
ceabb767 | 3387 | break; |
437d5aa5 MD |
3388 | case lttng_kernel_type_struct: |
3389 | ret = _lttng_struct_type_statedump(session, | |
3390 | lttng_kernel_get_type_struct(type), | |
3391 | nesting); | |
8070f5c0 | 3392 | break; |
437d5aa5 MD |
3393 | case lttng_kernel_type_variant: |
3394 | ret = _lttng_variant_type_statedump(session, | |
3395 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3396 | nesting, NULL); |
ceabb767 MD |
3397 | break; |
3398 | ||
3399 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3400 | case lttng_kernel_type_array: |
3401 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3402 | default: |
3403 | WARN_ON_ONCE(1); | |
3404 | return -EINVAL; | |
8070f5c0 | 3405 | } |
ceabb767 MD |
3406 | return ret; |
3407 | } | |
8070f5c0 | 3408 | |
ceabb767 MD |
3409 | /* |
3410 | * Must be called with sessions_mutex held. | |
3411 | */ | |
3412 | static | |
8cdc1a81 | 3413 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3414 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3415 | size_t nesting, |
3416 | const char **prev_field_name_p) | |
ceabb767 | 3417 | { |
51ef4536 | 3418 | const char *prev_field_name = NULL; |
ceabb767 | 3419 | int ret = 0; |
27d2368e | 3420 | |
51ef4536 MD |
3421 | if (prev_field_name_p) |
3422 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3423 | switch (field->type->type) { |
12bb2edb | 3424 | case lttng_kernel_type_integer: |
ceabb767 MD |
3425 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3426 | break; | |
437d5aa5 | 3427 | case lttng_kernel_type_enum: |
ceabb767 | 3428 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3429 | break; |
12bb2edb | 3430 | case lttng_kernel_type_string: |
ceabb767 | 3431 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3432 | break; |
437d5aa5 | 3433 | case lttng_kernel_type_struct: |
ceabb767 | 3434 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3435 | break; |
437d5aa5 | 3436 | case lttng_kernel_type_array: |
ceabb767 | 3437 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3438 | break; |
437d5aa5 | 3439 | case lttng_kernel_type_sequence: |
51ef4536 | 3440 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3441 | break; |
437d5aa5 | 3442 | case lttng_kernel_type_variant: |
51ef4536 | 3443 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3444 | break; |
f513b2bf | 3445 | |
8070f5c0 MD |
3446 | default: |
3447 | WARN_ON_ONCE(1); | |
3448 | return -EINVAL; | |
3449 | } | |
51ef4536 MD |
3450 | if (prev_field_name_p) |
3451 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3452 | return ret; |
3453 | } | |
3454 | ||
3455 | static | |
8cdc1a81 | 3456 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3457 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3458 | { |
51ef4536 | 3459 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3460 | int ret = 0; |
3461 | int i; | |
3462 | ||
3463 | if (!ctx) | |
3464 | return 0; | |
3465 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3466 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3467 | |
51ef4536 | 3468 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3469 | if (ret) |
3470 | return ret; | |
3471 | } | |
3472 | return ret; | |
3473 | } | |
3474 | ||
3475 | static | |
8cdc1a81 | 3476 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3477 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3478 | { |
51ef4536 | 3479 | const char *prev_field_name = NULL; |
a67ba386 | 3480 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3481 | int ret = 0; |
3482 | int i; | |
3483 | ||
6c8c025b MD |
3484 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3485 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3486 | |
51ef4536 | 3487 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3488 | if (ret) |
3489 | return ret; | |
c099397a MD |
3490 | } |
3491 | return ret; | |
3492 | } | |
3493 | ||
d83004aa JD |
3494 | /* |
3495 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3496 | * The entire event metadata is printed as a single atomic metadata |
3497 | * transaction. | |
d83004aa | 3498 | */ |
c099397a | 3499 | static |
ee7e9a18 | 3500 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3501 | { |
ee7e9a18 MD |
3502 | struct lttng_kernel_event_recorder *event_recorder; |
3503 | struct lttng_kernel_channel_buffer *chan; | |
3504 | struct lttng_kernel_session *session; | |
c099397a MD |
3505 | int ret = 0; |
3506 | ||
ee7e9a18 MD |
3507 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3508 | return 0; | |
3509 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3510 | chan = event_recorder->chan; | |
3511 | session = chan->parent.session; | |
3512 | ||
a67ba386 | 3513 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3514 | return 0; |
f7d06400 | 3515 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3516 | return 0; |
3517 | ||
8b97fd42 MD |
3518 | lttng_metadata_begin(session); |
3519 | ||
c099397a MD |
3520 | ret = lttng_metadata_printf(session, |
3521 | "event {\n" | |
ae734547 | 3522 | " name = \"%s\";\n" |
c099397a | 3523 | " id = %u;\n" |
b9074a1b | 3524 | " stream_id = %u;\n", |
a67ba386 MD |
3525 | event_recorder->priv->parent.desc->event_name, |
3526 | event_recorder->priv->id, | |
f7d06400 | 3527 | event_recorder->chan->priv->id); |
c099397a MD |
3528 | if (ret) |
3529 | goto end; | |
3530 | ||
8070f5c0 | 3531 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3532 | " fields := struct {\n" |
3533 | ); | |
3534 | if (ret) | |
3535 | goto end; | |
3536 | ||
a67ba386 | 3537 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3538 | if (ret) |
3539 | goto end; | |
3540 | ||
3541 | /* | |
3542 | * LTTng space reservation can only reserve multiples of the | |
3543 | * byte size. | |
3544 | */ | |
3545 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3546 | " };\n" |
3547 | "};\n\n"); | |
c099397a MD |
3548 | if (ret) |
3549 | goto end; | |
3550 | ||
a67ba386 | 3551 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3552 | end: |
8b97fd42 | 3553 | lttng_metadata_end(session); |
c099397a MD |
3554 | return ret; |
3555 | ||
3556 | } | |
3557 | ||
d83004aa JD |
3558 | /* |
3559 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3560 | * The entire channel metadata is printed as a single atomic metadata |
3561 | * transaction. | |
d83004aa | 3562 | */ |
c099397a | 3563 | static |
8cdc1a81 | 3564 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3565 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3566 | { |
3567 | int ret = 0; | |
3568 | ||
f7d06400 | 3569 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3570 | return 0; |
d83004aa | 3571 | |
f7d06400 | 3572 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3573 | return 0; |
3574 | ||
8b97fd42 MD |
3575 | lttng_metadata_begin(session); |
3576 | ||
f7d06400 | 3577 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3578 | ret = lttng_metadata_printf(session, |
3579 | "stream {\n" | |
3580 | " id = %u;\n" | |
9115fbdc | 3581 | " event.header := %s;\n" |
b9074a1b | 3582 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3583 | chan->priv->id, |
3584 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3585 | "struct event_header_large"); |
3586 | if (ret) | |
3587 | goto end; | |
3588 | ||
f7d06400 | 3589 | if (chan->priv->ctx) { |
b9074a1b MD |
3590 | ret = lttng_metadata_printf(session, |
3591 | " event.context := struct {\n"); | |
3592 | if (ret) | |
3593 | goto end; | |
3594 | } | |
f7d06400 | 3595 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3596 | if (ret) |
3597 | goto end; | |
f7d06400 | 3598 | if (chan->priv->ctx) { |
b9074a1b MD |
3599 | ret = lttng_metadata_printf(session, |
3600 | " };\n"); | |
3601 | if (ret) | |
3602 | goto end; | |
3603 | } | |
8070f5c0 MD |
3604 | |
3605 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3606 | "};\n\n"); |
8070f5c0 | 3607 | |
f7d06400 | 3608 | chan->priv->metadata_dumped = 1; |
c099397a | 3609 | end: |
8b97fd42 | 3610 | lttng_metadata_end(session); |
c099397a MD |
3611 | return ret; |
3612 | } | |
3613 | ||
d83004aa JD |
3614 | /* |
3615 | * Must be called with sessions_mutex held. | |
3616 | */ | |
9115fbdc | 3617 | static |
8cdc1a81 | 3618 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3619 | { |
3620 | return lttng_metadata_printf(session, | |
3621 | "struct packet_context {\n" | |
a3ccff4f MD |
3622 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3623 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3624 | " uint64_t content_size;\n" |
3625 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3626 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3627 | " unsigned long events_discarded;\n" |
9115fbdc | 3628 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3629 | "};\n\n" |
9115fbdc MD |
3630 | ); |
3631 | } | |
3632 | ||
3633 | /* | |
3634 | * Compact header: | |
3635 | * id: range: 0 - 30. | |
3636 | * id 31 is reserved to indicate an extended header. | |
3637 | * | |
3638 | * Large header: | |
3639 | * id: range: 0 - 65534. | |
3640 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3641 | * |
3642 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3643 | */ |
3644 | static | |
8cdc1a81 | 3645 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3646 | { |
3647 | return lttng_metadata_printf(session, | |
3648 | "struct event_header_compact {\n" | |
3649 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3650 | " variant <id> {\n" | |
3651 | " struct {\n" | |
a3ccff4f | 3652 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3653 | " } compact;\n" |
3654 | " struct {\n" | |
3655 | " uint32_t id;\n" | |
a3ccff4f | 3656 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3657 | " } extended;\n" |
3658 | " } v;\n" | |
3659 | "} align(%u);\n" | |
3660 | "\n" | |
3661 | "struct event_header_large {\n" | |
3662 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3663 | " variant <id> {\n" | |
3664 | " struct {\n" | |
a3ccff4f | 3665 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3666 | " } compact;\n" |
3667 | " struct {\n" | |
3668 | " uint32_t id;\n" | |
a3ccff4f | 3669 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3670 | " } extended;\n" |
3671 | " } v;\n" | |
3672 | "} align(%u);\n\n", | |
a90917c3 MD |
3673 | lttng_alignof(uint32_t) * CHAR_BIT, |
3674 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3675 | ); |
3676 | } | |
3677 | ||
a3ccff4f MD |
3678 | /* |
3679 | * Approximation of NTP time of day to clock monotonic correlation, | |
3680 | * taken at start of trace. | |
3681 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3682 | * in future versions. | |
5283350b MD |
3683 | * This function may return a negative offset. It may happen if the |
3684 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3685 | * |
3686 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3687 | * y2038 compliant. | |
a3ccff4f MD |
3688 | */ |
3689 | static | |
8967b2a3 | 3690 | int64_t measure_clock_offset(void) |
a3ccff4f | 3691 | { |
dcb93448 | 3692 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3693 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3694 | int64_t offset; |
a3ccff4f | 3695 | unsigned long flags; |
3636085f MJ |
3696 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3697 | struct timespec64 rts = { 0, 0 }; | |
3698 | #else | |
3699 | struct timespec rts = { 0, 0 }; | |
3700 | #endif | |
a3ccff4f MD |
3701 | |
3702 | /* Disable interrupts to increase correlation precision. */ | |
3703 | local_irq_save(flags); | |
3704 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3705 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3706 | ktime_get_real_ts64(&rts); | |
3707 | #else | |
216b6baa | 3708 | getnstimeofday(&rts); |
3636085f | 3709 | #endif |
a3ccff4f MD |
3710 | monotonic[1] = trace_clock_read64(); |
3711 | local_irq_restore(flags); | |
3712 | ||
dcb93448 | 3713 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3714 | realtime = (uint64_t) rts.tv_sec * tcf; |
3715 | if (tcf == NSEC_PER_SEC) { | |
3716 | realtime += rts.tv_nsec; | |
3717 | } else { | |
3718 | uint64_t n = rts.tv_nsec * tcf; | |
3719 | ||
3720 | do_div(n, NSEC_PER_SEC); | |
3721 | realtime += n; | |
3722 | } | |
dcb93448 | 3723 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3724 | return offset; |
3725 | } | |
3726 | ||
3eb95be4 | 3727 | static |
8cdc1a81 | 3728 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3729 | { |
0f3eaad4 | 3730 | int ret = 0; |
3eb95be4 JR |
3731 | size_t i; |
3732 | char cur; | |
3733 | ||
3734 | i = 0; | |
3735 | cur = string[i]; | |
3736 | while (cur != '\0') { | |
3737 | switch (cur) { | |
3738 | case '\n': | |
3739 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3740 | break; | |
3741 | case '\\': | |
3742 | case '"': | |
3743 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3744 | if (ret) | |
3745 | goto error; | |
3746 | /* We still print the current char */ | |
c190d76e | 3747 | lttng_fallthrough; |
3eb95be4 JR |
3748 | default: |
3749 | ret = lttng_metadata_printf(session, "%c", cur); | |
3750 | break; | |
3751 | } | |
3752 | ||
3753 | if (ret) | |
3754 | goto error; | |
3755 | ||
3756 | cur = string[++i]; | |
3757 | } | |
3758 | error: | |
3759 | return ret; | |
3760 | } | |
3761 | ||
3762 | static | |
8cdc1a81 | 3763 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3764 | const char *field_value) |
3eb95be4 JR |
3765 | { |
3766 | int ret; | |
3767 | ||
1c88f269 | 3768 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3769 | if (ret) |
3770 | goto error; | |
3771 | ||
1c88f269 | 3772 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3773 | if (ret) |
3774 | goto error; | |
3775 | ||
3776 | ret = lttng_metadata_printf(session, "\";\n"); | |
3777 | ||
3778 | error: | |
3779 | return ret; | |
3780 | } | |
3781 | ||
c099397a MD |
3782 | /* |
3783 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3784 | * Must be called with sessions_mutex held. |
c099397a MD |
3785 | */ |
3786 | static | |
8cdc1a81 | 3787 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3788 | { |
8cdc1a81 | 3789 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3790 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3791 | const char *product_uuid; |
f7d06400 | 3792 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3793 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3794 | int ret = 0; |
3795 | ||
585e5dcc | 3796 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3797 | return 0; |
8b97fd42 MD |
3798 | |
3799 | lttng_metadata_begin(session); | |
3800 | ||
8cdc1a81 | 3801 | if (session->priv->metadata_dumped) |
c099397a | 3802 | goto skip_session; |
c099397a | 3803 | |
d793d5e1 | 3804 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3805 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3806 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3807 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3808 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3809 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3810 | |
3811 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3812 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3813 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3814 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3815 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3816 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3817 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3818 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3819 | "\n" |
3820 | "trace {\n" | |
3821 | " major = %u;\n" | |
3822 | " minor = %u;\n" | |
30bdb6e4 | 3823 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3824 | " byte_order = %s;\n" |
3825 | " packet.header := struct {\n" | |
3826 | " uint32_t magic;\n" | |
1ec3f75a | 3827 | " uint8_t uuid[16];\n" |
d793d5e1 | 3828 | " uint32_t stream_id;\n" |
5594698f | 3829 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3830 | " };\n" |
d793d5e1 | 3831 | "};\n\n", |
a90917c3 MD |
3832 | lttng_alignof(uint8_t) * CHAR_BIT, |
3833 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3834 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3835 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3836 | sizeof(unsigned long) * CHAR_BIT, |
3837 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3838 | CTF_SPEC_MAJOR, |
3839 | CTF_SPEC_MINOR, | |
d793d5e1 | 3840 | uuid_s, |
5214fa50 | 3841 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3842 | "be" |
3843 | #else | |
3844 | "le" | |
3845 | #endif | |
3846 | ); | |
3847 | if (ret) | |
3848 | goto end; | |
3849 | ||
99dc9597 MD |
3850 | ret = lttng_metadata_printf(session, |
3851 | "env {\n" | |
a6058143 | 3852 | " hostname = \"%s\";\n" |
c6c9e10f | 3853 | " domain = \"kernel\";\n" |
99dc9597 | 3854 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3855 | " kernel_release = \"%s\";\n" |
3856 | " kernel_version = \"%s\";\n" | |
3857 | " tracer_name = \"lttng-modules\";\n" | |
3858 | " tracer_major = %d;\n" | |
3859 | " tracer_minor = %d;\n" | |
3860 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3861 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3862 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3863 | utsname()->sysname, |
3864 | utsname()->release, | |
c6c9e10f MD |
3865 | utsname()->version, |
3866 | LTTNG_MODULES_MAJOR_VERSION, | |
3867 | LTTNG_MODULES_MINOR_VERSION, | |
3868 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3869 | ); |
3870 | if (ret) | |
3871 | goto end; | |
3872 | ||
8cdc1a81 | 3873 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3874 | if (ret) |
3875 | goto end; | |
3876 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3877 | session->priv->creation_time); |
3eb95be4 JR |
3878 | if (ret) |
3879 | goto end; | |
3880 | ||
c88f762e GB |
3881 | /* Add the product UUID to the 'env' section */ |
3882 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3883 | if (product_uuid) { | |
3884 | ret = lttng_metadata_printf(session, | |
3885 | " product_uuid = \"%s\";\n", | |
3886 | product_uuid | |
3887 | ); | |
3888 | if (ret) | |
3889 | goto end; | |
3890 | } | |
3891 | ||
3892 | /* Close the 'env' section */ | |
3eb95be4 JR |
3893 | ret = lttng_metadata_printf(session, "};\n\n"); |
3894 | if (ret) | |
3895 | goto end; | |
3896 | ||
a3ccff4f MD |
3897 | ret = lttng_metadata_printf(session, |
3898 | "clock {\n" | |
2754583e MD |
3899 | " name = \"%s\";\n", |
3900 | trace_clock_name() | |
a82c63f1 MD |
3901 | ); |
3902 | if (ret) | |
3903 | goto end; | |
3904 | ||
3905 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3906 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3907 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3908 | clock_uuid_s |
3909 | ); | |
3910 | if (ret) | |
3911 | goto end; | |
3912 | } | |
3913 | ||
3914 | ret = lttng_metadata_printf(session, | |
2754583e | 3915 | " description = \"%s\";\n" |
a3ccff4f MD |
3916 | " freq = %llu; /* Frequency, in Hz */\n" |
3917 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3918 | " offset = %lld;\n" |
a3ccff4f | 3919 | "};\n\n", |
2754583e | 3920 | trace_clock_description(), |
a3ccff4f | 3921 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3922 | (long long) measure_clock_offset() |
a3ccff4f MD |
3923 | ); |
3924 | if (ret) | |
3925 | goto end; | |
3926 | ||
3927 | ret = lttng_metadata_printf(session, | |
3928 | "typealias integer {\n" | |
3929 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3930 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3931 | "} := uint27_clock_monotonic_t;\n" |
3932 | "\n" | |
3933 | "typealias integer {\n" | |
3934 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3935 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3936 | "} := uint32_clock_monotonic_t;\n" |
3937 | "\n" | |
3938 | "typealias integer {\n" | |
3939 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3940 | " map = clock.%s.value;\n" |
a3ccff4f | 3941 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3942 | trace_clock_name(), |
a3ccff4f | 3943 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3944 | trace_clock_name(), |
3945 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3946 | trace_clock_name() | |
a3ccff4f MD |
3947 | ); |
3948 | if (ret) | |
3949 | goto end; | |
3950 | ||
a90917c3 | 3951 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3952 | if (ret) |
3953 | goto end; | |
3954 | ||
a90917c3 | 3955 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3956 | if (ret) |
3957 | goto end; | |
3958 | ||
c099397a | 3959 | skip_session: |
f7d06400 MD |
3960 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3961 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3962 | if (ret) |
3963 | goto end; | |
3964 | } | |
3965 | ||
f237aef8 | 3966 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3967 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3968 | if (ret) |
3969 | goto end; | |
3970 | } | |
8cdc1a81 | 3971 | session->priv->metadata_dumped = 1; |
c099397a | 3972 | end: |
8b97fd42 | 3973 | lttng_metadata_end(session); |
c099397a MD |
3974 | return ret; |
3975 | } | |
3976 | ||
c0e31d2e | 3977 | /** |
a90917c3 | 3978 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3979 | * @transport: transport structure |
3980 | * | |
3981 | * Registers a transport which can be used as output to extract the data out of | |
3982 | * LTTng. The module calling this registration function must ensure that no | |
3983 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3984 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3985 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3986 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3987 | * after its registration must it synchronize the TLBs. |
3988 | */ | |
a90917c3 | 3989 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3990 | { |
3991 | /* | |
3992 | * Make sure no page fault can be triggered by the module about to be | |
3993 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3994 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3995 | */ |
263b6c88 | 3996 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3997 | |
3998 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3999 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4000 | mutex_unlock(&sessions_mutex); |
4001 | } | |
a90917c3 | 4002 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4003 | |
4004 | /** | |
a90917c3 | 4005 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4006 | * @transport: transport structure |
4007 | */ | |
a90917c3 | 4008 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4009 | { |
4010 | mutex_lock(&sessions_mutex); | |
4011 | list_del(&transport->node); | |
4012 | mutex_unlock(&sessions_mutex); | |
4013 | } | |
a90917c3 | 4014 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4015 | |
a101fa10 MD |
4016 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4017 | { | |
4018 | /* | |
4019 | * Make sure no page fault can be triggered by the module about to be | |
4020 | * registered. We deal with this here so we don't have to call | |
4021 | * vmalloc_sync_mappings() in each module's init. | |
4022 | */ | |
4023 | wrapper_vmalloc_sync_mappings(); | |
4024 | ||
4025 | mutex_lock(&sessions_mutex); | |
4026 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4027 | mutex_unlock(&sessions_mutex); | |
4028 | } | |
4029 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4030 | ||
4031 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4032 | { | |
4033 | mutex_lock(&sessions_mutex); | |
4034 | list_del(&transport->node); | |
4035 | mutex_unlock(&sessions_mutex); | |
4036 | } | |
4037 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4038 | ||
5f4c791e | 4039 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4040 | |
4041 | enum cpuhp_state lttng_hp_prepare; | |
4042 | enum cpuhp_state lttng_hp_online; | |
4043 | ||
4044 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4045 | { | |
4046 | struct lttng_cpuhp_node *lttng_node; | |
4047 | ||
4048 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4049 | switch (lttng_node->component) { | |
4050 | case LTTNG_RING_BUFFER_FRONTEND: | |
4051 | return 0; | |
4052 | case LTTNG_RING_BUFFER_BACKEND: | |
4053 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4054 | case LTTNG_RING_BUFFER_ITER: | |
4055 | return 0; | |
4056 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4057 | return 0; | |
4058 | default: | |
4059 | return -EINVAL; | |
4060 | } | |
4061 | } | |
4062 | ||
4063 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4064 | { | |
4065 | struct lttng_cpuhp_node *lttng_node; | |
4066 | ||
4067 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4068 | switch (lttng_node->component) { | |
4069 | case LTTNG_RING_BUFFER_FRONTEND: | |
4070 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4071 | case LTTNG_RING_BUFFER_BACKEND: | |
4072 | return 0; | |
4073 | case LTTNG_RING_BUFFER_ITER: | |
4074 | return 0; | |
4075 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4076 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4077 | default: | |
4078 | return -EINVAL; | |
4079 | } | |
4080 | } | |
4081 | ||
4082 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4083 | { | |
4084 | struct lttng_cpuhp_node *lttng_node; | |
4085 | ||
4086 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4087 | switch (lttng_node->component) { | |
4088 | case LTTNG_RING_BUFFER_FRONTEND: | |
4089 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4090 | case LTTNG_RING_BUFFER_BACKEND: | |
4091 | return 0; | |
4092 | case LTTNG_RING_BUFFER_ITER: | |
4093 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4094 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4095 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4096 | default: | |
4097 | return -EINVAL; | |
4098 | } | |
4099 | } | |
4100 | ||
4101 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4102 | { | |
4103 | struct lttng_cpuhp_node *lttng_node; | |
4104 | ||
4105 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4106 | switch (lttng_node->component) { | |
4107 | case LTTNG_RING_BUFFER_FRONTEND: | |
4108 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4109 | case LTTNG_RING_BUFFER_BACKEND: | |
4110 | return 0; | |
4111 | case LTTNG_RING_BUFFER_ITER: | |
4112 | return 0; | |
4113 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4114 | return 0; | |
4115 | default: | |
4116 | return -EINVAL; | |
4117 | } | |
4118 | } | |
4119 | ||
4120 | static int __init lttng_init_cpu_hotplug(void) | |
4121 | { | |
4122 | int ret; | |
4123 | ||
4124 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4125 | lttng_hotplug_prepare, | |
4126 | lttng_hotplug_dead); | |
4127 | if (ret < 0) { | |
4128 | return ret; | |
4129 | } | |
4130 | lttng_hp_prepare = ret; | |
4131 | lttng_rb_set_hp_prepare(ret); | |
4132 | ||
4133 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4134 | lttng_hotplug_online, | |
4135 | lttng_hotplug_offline); | |
4136 | if (ret < 0) { | |
4137 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4138 | lttng_hp_prepare = 0; | |
4139 | return ret; | |
4140 | } | |
4141 | lttng_hp_online = ret; | |
4142 | lttng_rb_set_hp_online(ret); | |
4143 | ||
4144 | return 0; | |
4145 | } | |
4146 | ||
4147 | static void __exit lttng_exit_cpu_hotplug(void) | |
4148 | { | |
4149 | lttng_rb_set_hp_online(0); | |
4150 | cpuhp_remove_multi_state(lttng_hp_online); | |
4151 | lttng_rb_set_hp_prepare(0); | |
4152 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4153 | } | |
4154 | ||
5f4c791e | 4155 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4156 | static int lttng_init_cpu_hotplug(void) |
4157 | { | |
4158 | return 0; | |
4159 | } | |
4160 | static void lttng_exit_cpu_hotplug(void) | |
4161 | { | |
4162 | } | |
5f4c791e | 4163 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4164 | |
a90917c3 | 4165 | static int __init lttng_events_init(void) |
4e3c1b9b | 4166 | { |
1c25284c MD |
4167 | int ret; |
4168 | ||
453b2495 JD |
4169 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4170 | if (ret) | |
4171 | return ret; | |
389d7070 | 4172 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4173 | if (ret) |
4174 | return ret; | |
4175 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4176 | if (ret) |
4177 | return ret; | |
4178 | ret = lttng_probes_init(); | |
389d7070 MD |
4179 | if (ret) |
4180 | return ret; | |
07dfc1d0 | 4181 | ret = lttng_context_init(); |
20591cf7 MD |
4182 | if (ret) |
4183 | return ret; | |
07dfc1d0 MD |
4184 | ret = lttng_tracepoint_init(); |
4185 | if (ret) | |
4186 | goto error_tp; | |
a67ba386 MD |
4187 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4188 | if (!event_recorder_cache) { | |
20591cf7 | 4189 | ret = -ENOMEM; |
a67ba386 | 4190 | goto error_kmem_event_recorder; |
dffef45d | 4191 | } |
a67ba386 MD |
4192 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4193 | if (!event_recorder_private_cache) { | |
4194 | ret = -ENOMEM; | |
4195 | goto error_kmem_event_recorder_private; | |
4196 | } | |
4197 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4198 | if (!event_notifier_cache) { |
4199 | ret = -ENOMEM; | |
4200 | goto error_kmem_event_notifier; | |
20591cf7 | 4201 | } |
a67ba386 MD |
4202 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4203 | if (!event_notifier_private_cache) { | |
4204 | ret = -ENOMEM; | |
4205 | goto error_kmem_event_notifier_private; | |
4206 | } | |
80996790 | 4207 | ret = lttng_abi_init(); |
02119ee5 MD |
4208 | if (ret) |
4209 | goto error_abi; | |
0c956676 MD |
4210 | ret = lttng_logger_init(); |
4211 | if (ret) | |
4212 | goto error_logger; | |
1e367326 MD |
4213 | ret = lttng_init_cpu_hotplug(); |
4214 | if (ret) | |
4215 | goto error_hotplug; | |
101215b7 | 4216 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4217 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4218 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4219 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4220 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4221 | LTTNG_VERSION_NAME, |
4222 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4223 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4224 | #else | |
4225 | "", | |
4226 | #endif | |
4227 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4228 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4229 | #else | |
4230 | ""); | |
4231 | #endif | |
c1551e57 MJ |
4232 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4233 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4234 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4235 | return 0; |
0c956676 | 4236 | |
1e367326 MD |
4237 | error_hotplug: |
4238 | lttng_logger_exit(); | |
0c956676 MD |
4239 | error_logger: |
4240 | lttng_abi_exit(); | |
02119ee5 | 4241 | error_abi: |
a67ba386 MD |
4242 | kmem_cache_destroy(event_notifier_private_cache); |
4243 | error_kmem_event_notifier_private: | |
dffef45d FD |
4244 | kmem_cache_destroy(event_notifier_cache); |
4245 | error_kmem_event_notifier: | |
a67ba386 MD |
4246 | kmem_cache_destroy(event_recorder_private_cache); |
4247 | error_kmem_event_recorder_private: | |
4248 | kmem_cache_destroy(event_recorder_cache); | |
4249 | error_kmem_event_recorder: | |
20591cf7 | 4250 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4251 | error_tp: |
4252 | lttng_context_exit(); | |
101215b7 | 4253 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4254 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4255 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4256 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4257 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4258 | LTTNG_VERSION_NAME, |
4259 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4260 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4261 | #else | |
4262 | "", | |
4263 | #endif | |
4264 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4265 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4266 | #else | |
4267 | ""); | |
4268 | #endif | |
1c25284c | 4269 | return ret; |
4e3c1b9b MD |
4270 | } |
4271 | ||
a90917c3 | 4272 | module_init(lttng_events_init); |
11b5a3c2 | 4273 | |
a90917c3 | 4274 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4275 | { |
8cdc1a81 | 4276 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4277 | |
1e367326 | 4278 | lttng_exit_cpu_hotplug(); |
0c956676 | 4279 | lttng_logger_exit(); |
80996790 | 4280 | lttng_abi_exit(); |
8cdc1a81 MD |
4281 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4282 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4283 | kmem_cache_destroy(event_recorder_cache); |
4284 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4285 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4286 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4287 | lttng_tracepoint_exit(); |
07dfc1d0 | 4288 | lttng_context_exit(); |
101215b7 | 4289 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4290 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4291 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4292 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4293 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4294 | LTTNG_VERSION_NAME, |
4295 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4296 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4297 | #else | |
4298 | "", | |
4299 | #endif | |
4300 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4301 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4302 | #else | |
4303 | ""); | |
4304 | #endif | |
4e3c1b9b | 4305 | } |
92e94819 | 4306 | |
a90917c3 | 4307 | module_exit(lttng_events_exit); |
11b5a3c2 | 4308 | |
7ca11e77 | 4309 | #include <generated/patches.h> |
101215b7 MJ |
4310 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4311 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4312 | #endif | |
4313 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4314 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4315 | #endif | |
92e94819 MD |
4316 | MODULE_LICENSE("GPL and additional rights"); |
4317 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4318 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4319 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4320 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4321 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4322 | LTTNG_MODULES_EXTRAVERSION); |