Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
8c6e7f13 | 26 | #include <linux/uaccess.h> |
a606b6e8 | 27 | #include <linux/vmalloc.h> |
c88f762e | 28 | #include <linux/dmi.h> |
3c997079 | 29 | |
c190d76e | 30 | #include <wrapper/compiler_attributes.h> |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
92bc1e23 | 39 | #include <lttng/events-internal.h> |
0b365677 | 40 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 41 | #include <lttng/tracer.h> |
21f58fb7 | 42 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
43 | #include <lttng/abi-old.h> |
44 | #include <lttng/endian.h> | |
45 | #include <lttng/string-utils.h> | |
4a11ef1c | 46 | #include <lttng/utils.h> |
24591303 MD |
47 | #include <ringbuffer/backend.h> |
48 | #include <ringbuffer/frontend.h> | |
4e3c1b9b | 49 | |
9f2d2694 MJ |
50 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \ |
51 | || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0)) | |
5987e66c MJ |
52 | #include <linux/stdarg.h> |
53 | #else | |
54 | #include <stdarg.h> | |
55 | #endif | |
56 | ||
d83004aa JD |
57 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
58 | ||
4e3c1b9b | 59 | static LIST_HEAD(sessions); |
750b05f2 | 60 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 61 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 62 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
63 | /* |
64 | * Protect the sessions and metadata caches. | |
65 | */ | |
4e3c1b9b | 66 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
67 | static struct kmem_cache *event_recorder_cache; |
68 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 69 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 70 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 71 | |
8cdc1a81 MD |
72 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
73 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 74 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 75 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 76 | |
0648898e | 77 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 78 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
6a338ba4 | 79 | static void _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 80 | static |
ee7e9a18 | 81 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 82 | static |
8cdc1a81 | 83 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
84 | static |
85 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 86 | static |
8cdc1a81 | 87 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
88 | const struct lttng_kernel_type_common *type, |
89 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
90 | size_t nesting); |
91 | static | |
8cdc1a81 | 92 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 93 | const struct lttng_kernel_event_field *field, |
51ef4536 | 94 | size_t nesting, const char **prev_field_name_p); |
c099397a | 95 | |
c099397a | 96 | void synchronize_trace(void) |
abcca994 | 97 | { |
05355f0b MJ |
98 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
99 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
100 | synchronize_rcu(); |
101 | #else | |
abcca994 | 102 | synchronize_sched(); |
92da05ce MJ |
103 | #endif |
104 | ||
b8590f40 MD |
105 | #ifdef CONFIG_PREEMPT_RT_FULL |
106 | synchronize_rcu(); | |
107 | #endif | |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
9fe593d2 FD |
120 | static struct lttng_transport *lttng_transport_find(const char *name) |
121 | { | |
122 | struct lttng_transport *transport; | |
123 | ||
124 | list_for_each_entry(transport, <tng_transport_list, node) { | |
125 | if (!strcmp(transport->name, name)) | |
126 | return transport; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
3c997079 MD |
131 | /* |
132 | * Called with sessions lock held. | |
133 | */ | |
134 | int lttng_session_active(void) | |
135 | { | |
8cdc1a81 | 136 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
137 | |
138 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 139 | if (iter->pub->active) |
3c997079 MD |
140 | return 1; |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
8cdc1a81 | 145 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 146 | { |
8cdc1a81 MD |
147 | struct lttng_kernel_session *session; |
148 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 149 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 150 | int i; |
4e3c1b9b MD |
151 | |
152 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 153 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 154 | if (!session) |
d83004aa | 155 | goto err; |
8cdc1a81 MD |
156 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
157 | if (!session_priv) | |
158 | goto err_free_session; | |
159 | session->priv = session_priv; | |
160 | session_priv->pub = session; | |
161 | ||
162 | INIT_LIST_HEAD(&session_priv->chan); | |
163 | INIT_LIST_HEAD(&session_priv->events); | |
164 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
165 | |
166 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
167 | GFP_KERNEL); | |
168 | if (!metadata_cache) | |
8cdc1a81 | 169 | goto err_free_session_private; |
0ca42eb7 | 170 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
171 | if (!metadata_cache->data) |
172 | goto err_free_cache; | |
173 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
174 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 175 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 176 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 177 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 178 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 179 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 180 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 181 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
182 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
183 | list_add(&session_priv->list, &sessions); | |
184 | ||
8c0393c3 MD |
185 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
186 | goto tracker_alloc_error; | |
187 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
188 | goto tracker_alloc_error; | |
189 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
190 | goto tracker_alloc_error; | |
191 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
192 | goto tracker_alloc_error; | |
193 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
194 | goto tracker_alloc_error; | |
195 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
196 | goto tracker_alloc_error; | |
197 | ||
4e3c1b9b | 198 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 199 | |
4e3c1b9b | 200 | return session; |
d83004aa | 201 | |
8c0393c3 MD |
202 | tracker_alloc_error: |
203 | lttng_id_tracker_fini(&session->pid_tracker); | |
204 | lttng_id_tracker_fini(&session->vpid_tracker); | |
205 | lttng_id_tracker_fini(&session->uid_tracker); | |
206 | lttng_id_tracker_fini(&session->vuid_tracker); | |
207 | lttng_id_tracker_fini(&session->gid_tracker); | |
208 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
209 | err_free_cache: |
210 | kfree(metadata_cache); | |
8cdc1a81 MD |
211 | err_free_session_private: |
212 | lttng_kvfree(session_priv); | |
d83004aa | 213 | err_free_session: |
48f5e0b5 | 214 | lttng_kvfree(session); |
d83004aa JD |
215 | err: |
216 | mutex_unlock(&sessions_mutex); | |
217 | return NULL; | |
218 | } | |
219 | ||
99f52fcc FD |
220 | static |
221 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
222 | { | |
223 | struct lttng_counter_transport *transport; | |
224 | ||
225 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
226 | if (!strcmp(transport->name, name)) | |
227 | return transport; | |
228 | } | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | struct lttng_counter *lttng_kernel_counter_create( | |
233 | const char *counter_transport_name, | |
234 | size_t number_dimensions, const size_t *dimensions_sizes) | |
235 | { | |
236 | struct lttng_counter *counter = NULL; | |
237 | struct lttng_counter_transport *counter_transport = NULL; | |
238 | ||
239 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
240 | if (!counter_transport) { | |
241 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
242 | counter_transport_name); | |
243 | goto notransport; | |
244 | } | |
245 | if (!try_module_get(counter_transport->owner)) { | |
246 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
247 | goto notransport; | |
248 | } | |
249 | ||
250 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
251 | if (!counter) | |
252 | goto nomem; | |
253 | ||
254 | /* Create event notifier error counter. */ | |
255 | counter->ops = &counter_transport->ops; | |
256 | counter->transport = counter_transport; | |
257 | ||
258 | counter->counter = counter->ops->counter_create( | |
259 | number_dimensions, dimensions_sizes, 0); | |
260 | if (!counter->counter) { | |
261 | goto create_error; | |
262 | } | |
263 | ||
264 | return counter; | |
265 | ||
266 | create_error: | |
267 | lttng_kvfree(counter); | |
268 | nomem: | |
269 | if (counter_transport) | |
270 | module_put(counter_transport->owner); | |
271 | notransport: | |
272 | return NULL; | |
273 | } | |
274 | ||
750b05f2 FD |
275 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
276 | { | |
277 | struct lttng_transport *transport = NULL; | |
278 | struct lttng_event_notifier_group *event_notifier_group; | |
279 | const char *transport_name = "relay-event-notifier"; | |
280 | size_t subbuf_size = 4096; //TODO | |
281 | size_t num_subbuf = 16; //TODO | |
282 | unsigned int switch_timer_interval = 0; | |
283 | unsigned int read_timer_interval = 0; | |
dffef45d | 284 | int i; |
750b05f2 FD |
285 | |
286 | mutex_lock(&sessions_mutex); | |
287 | ||
288 | transport = lttng_transport_find(transport_name); | |
289 | if (!transport) { | |
290 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
291 | transport_name); | |
292 | goto notransport; | |
293 | } | |
294 | if (!try_module_get(transport->owner)) { | |
295 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
296 | transport_name); | |
297 | goto notransport; | |
298 | } | |
299 | ||
300 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
301 | GFP_KERNEL); | |
302 | if (!event_notifier_group) | |
303 | goto nomem; | |
304 | ||
305 | /* | |
306 | * Initialize the ring buffer used to store event notifier | |
307 | * notifications. | |
308 | */ | |
309 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 310 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
311 | transport_name, event_notifier_group, NULL, |
312 | subbuf_size, num_subbuf, switch_timer_interval, | |
313 | read_timer_interval); | |
314 | if (!event_notifier_group->chan) | |
315 | goto create_error; | |
316 | ||
317 | event_notifier_group->transport = transport; | |
dffef45d FD |
318 | |
319 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
320 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
321 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
322 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 323 | |
750b05f2 FD |
324 | list_add(&event_notifier_group->node, &event_notifier_groups); |
325 | ||
326 | mutex_unlock(&sessions_mutex); | |
327 | ||
328 | return event_notifier_group; | |
329 | ||
330 | create_error: | |
331 | lttng_kvfree(event_notifier_group); | |
332 | nomem: | |
333 | if (transport) | |
334 | module_put(transport->owner); | |
335 | notransport: | |
336 | mutex_unlock(&sessions_mutex); | |
337 | return NULL; | |
338 | } | |
339 | ||
d83004aa JD |
340 | void metadata_cache_destroy(struct kref *kref) |
341 | { | |
342 | struct lttng_metadata_cache *cache = | |
343 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 344 | vfree(cache->data); |
d83004aa | 345 | kfree(cache); |
4e3c1b9b MD |
346 | } |
347 | ||
8cdc1a81 | 348 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 349 | { |
f7d06400 | 350 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 351 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 352 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 353 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 354 | int ret; |
4e3c1b9b MD |
355 | |
356 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 357 | WRITE_ONCE(session->active, 0); |
f7d06400 | 358 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 359 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
360 | WARN_ON(ret); |
361 | } | |
6a338ba4 MD |
362 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) |
363 | _lttng_event_unregister(&event_recorder_priv->pub->parent); | |
abcca994 | 364 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 365 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 366 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
367 | WARN_ON(ret); |
368 | } | |
09710b83 MD |
369 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
370 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 371 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 372 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
373 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
374 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
375 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 376 | } |
8cdc1a81 MD |
377 | mutex_lock(&session->priv->metadata_cache->lock); |
378 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 379 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 380 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
381 | lttng_id_tracker_fini(&session->pid_tracker); |
382 | lttng_id_tracker_fini(&session->vpid_tracker); | |
383 | lttng_id_tracker_fini(&session->uid_tracker); | |
384 | lttng_id_tracker_fini(&session->vuid_tracker); | |
385 | lttng_id_tracker_fini(&session->gid_tracker); | |
386 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
387 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
388 | list_del(&session->priv->list); | |
4e3c1b9b | 389 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 390 | lttng_kvfree(session->priv); |
48f5e0b5 | 391 | lttng_kvfree(session); |
4e3c1b9b MD |
392 | } |
393 | ||
dffef45d FD |
394 | void lttng_event_notifier_group_destroy( |
395 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 396 | { |
09710b83 | 397 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 398 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
399 | int ret; |
400 | ||
750b05f2 FD |
401 | if (!event_notifier_group) |
402 | return; | |
403 | ||
404 | mutex_lock(&sessions_mutex); | |
dffef45d | 405 | |
6053e75e | 406 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
407 | WARN_ON(ret); |
408 | ||
a67ba386 | 409 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
6a338ba4 MD |
410 | &event_notifier_group->event_notifiers_head, parent.node) |
411 | _lttng_event_unregister(&event_notifier_priv->pub->parent); | |
dffef45d | 412 | |
b01155ba FD |
413 | /* Wait for in-flight event notifier to complete */ |
414 | synchronize_trace(); | |
415 | ||
21f58fb7 FD |
416 | irq_work_sync(&event_notifier_group->wakeup_pending); |
417 | ||
6053e75e MD |
418 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
419 | WARN_ON(ret); | |
8a8ac9a8 | 420 | |
09710b83 | 421 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 422 | &event_notifier_group->enablers_head, node) |
09710b83 | 423 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 424 | |
a67ba386 | 425 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 426 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 427 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 428 | |
99f52fcc FD |
429 | if (event_notifier_group->error_counter) { |
430 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 431 | |
99f52fcc FD |
432 | error_counter->ops->counter_destroy(error_counter->counter); |
433 | module_put(error_counter->transport->owner); | |
434 | lttng_kvfree(error_counter); | |
435 | event_notifier_group->error_counter = NULL; | |
436 | } | |
437 | ||
4a399b76 | 438 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
439 | module_put(event_notifier_group->transport->owner); |
440 | list_del(&event_notifier_group->node); | |
dffef45d | 441 | |
750b05f2 FD |
442 | mutex_unlock(&sessions_mutex); |
443 | lttng_kvfree(event_notifier_group); | |
444 | } | |
445 | ||
8cdc1a81 | 446 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
447 | { |
448 | int ret; | |
449 | ||
450 | mutex_lock(&sessions_mutex); | |
451 | ret = lttng_statedump_start(session); | |
452 | mutex_unlock(&sessions_mutex); | |
453 | return ret; | |
454 | } | |
455 | ||
8cdc1a81 | 456 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
457 | { |
458 | int ret = 0; | |
f7d06400 | 459 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
460 | |
461 | mutex_lock(&sessions_mutex); | |
462 | if (session->active) { | |
463 | ret = -EBUSY; | |
464 | goto end; | |
465 | } | |
c099397a | 466 | |
3c997079 | 467 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 468 | session->priv->tstate = 1; |
3c997079 | 469 | |
4ef81e4a | 470 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 471 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 472 | |
c099397a MD |
473 | /* |
474 | * Snapshot the number of events per channel to know the type of header | |
475 | * we need to use. | |
476 | */ | |
f7d06400 MD |
477 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
478 | if (chan_priv->header_type) | |
479 | continue; /* don't change it if session stop/restart */ | |
480 | if (chan_priv->free_event_id < 31) | |
481 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 482 | else |
f7d06400 | 483 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
484 | } |
485 | ||
64af2437 | 486 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
487 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
488 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
489 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 490 | } |
64af2437 | 491 | |
a8f2d0c7 | 492 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 493 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 494 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 495 | if (ret) { |
a8f2d0c7 | 496 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
497 | goto end; |
498 | } | |
499 | ret = lttng_statedump_start(session); | |
360f38ea | 500 | if (ret) |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
502 | end: |
503 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 504 | return ret; |
c0e31d2e MD |
505 | } |
506 | ||
8cdc1a81 | 507 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
508 | { |
509 | int ret = 0; | |
f7d06400 | 510 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
511 | |
512 | mutex_lock(&sessions_mutex); | |
513 | if (!session->active) { | |
514 | ret = -EBUSY; | |
515 | goto end; | |
516 | } | |
a8f2d0c7 | 517 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
518 | |
519 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 520 | session->priv->tstate = 0; |
b2bc0bc8 | 521 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
522 | |
523 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
524 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
525 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
526 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 527 | } |
c0e31d2e MD |
528 | end: |
529 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 530 | return ret; |
c0e31d2e MD |
531 | } |
532 | ||
8cdc1a81 | 533 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
534 | { |
535 | int ret = 0; | |
f7d06400 | 536 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 537 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 538 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
539 | struct lttng_metadata_stream *stream; |
540 | ||
541 | mutex_lock(&sessions_mutex); | |
542 | if (!session->active) { | |
543 | ret = -EBUSY; | |
544 | goto end; | |
545 | } | |
546 | ||
547 | mutex_lock(&cache->lock); | |
548 | memset(cache->data, 0, cache->cache_alloc); | |
549 | cache->metadata_written = 0; | |
550 | cache->version++; | |
8cdc1a81 | 551 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
552 | stream->metadata_out = 0; |
553 | stream->metadata_in = 0; | |
554 | } | |
555 | mutex_unlock(&cache->lock); | |
556 | ||
8cdc1a81 | 557 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
558 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
559 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
560 | } |
561 | ||
f237aef8 | 562 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 563 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
564 | } |
565 | ||
566 | ret = _lttng_session_metadata_statedump(session); | |
567 | ||
568 | end: | |
569 | mutex_unlock(&sessions_mutex); | |
570 | return ret; | |
571 | } | |
572 | ||
6b757027 MD |
573 | static |
574 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
575 | { | |
576 | struct lttng_kernel_channel_buffer *chan_buf; | |
577 | ||
578 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
579 | return false; | |
580 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
581 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
582 | return true; | |
583 | return false; | |
584 | } | |
585 | ||
586 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 587 | { |
3c997079 | 588 | int ret = 0; |
e64957da | 589 | |
3c997079 | 590 | mutex_lock(&sessions_mutex); |
6b757027 | 591 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
592 | ret = -EPERM; |
593 | goto end; | |
594 | } | |
6b757027 | 595 | if (channel->enabled) { |
3c997079 MD |
596 | ret = -EEXIST; |
597 | goto end; | |
598 | } | |
599 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
600 | channel->priv->tstate = 1; |
601 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 602 | /* Set atomically the state to "enabled" */ |
6b757027 | 603 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
604 | end: |
605 | mutex_unlock(&sessions_mutex); | |
606 | return ret; | |
e64957da MD |
607 | } |
608 | ||
6b757027 | 609 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 610 | { |
3c997079 | 611 | int ret = 0; |
e64957da | 612 | |
3c997079 | 613 | mutex_lock(&sessions_mutex); |
6b757027 | 614 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
615 | ret = -EPERM; |
616 | goto end; | |
617 | } | |
6b757027 | 618 | if (!channel->enabled) { |
3c997079 MD |
619 | ret = -EEXIST; |
620 | goto end; | |
621 | } | |
622 | /* Set atomically the state to "disabled" */ | |
6b757027 | 623 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 624 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
625 | channel->priv->tstate = 0; |
626 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
627 | end: |
628 | mutex_unlock(&sessions_mutex); | |
629 | return ret; | |
e64957da MD |
630 | } |
631 | ||
9d993668 | 632 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 633 | { |
3c997079 | 634 | int ret = 0; |
e64957da | 635 | |
3c997079 | 636 | mutex_lock(&sessions_mutex); |
9d993668 MD |
637 | switch (event->type) { |
638 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
639 | { | |
640 | struct lttng_kernel_event_recorder *event_recorder = | |
641 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
642 | ||
f7d06400 | 643 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
644 | ret = -EPERM; |
645 | goto end; | |
646 | } | |
a0493bef | 647 | break; |
9d993668 MD |
648 | } |
649 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
650 | switch (event->priv->instrumentation) { | |
651 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
652 | ret = -EINVAL; | |
653 | goto end; | |
654 | default: | |
655 | break; | |
656 | } | |
a0493bef MD |
657 | break; |
658 | default: | |
9d993668 | 659 | break; |
a0493bef | 660 | } |
e64957da | 661 | |
9d993668 | 662 | if (event->enabled) { |
3c997079 MD |
663 | ret = -EEXIST; |
664 | goto end; | |
665 | } | |
a67ba386 | 666 | switch (event->priv->instrumentation) { |
c190d76e MJ |
667 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
668 | lttng_fallthrough; | |
606828e4 | 669 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
670 | ret = -EINVAL; |
671 | break; | |
b4a75708 | 672 | |
c190d76e MJ |
673 | case LTTNG_KERNEL_ABI_KPROBE: |
674 | lttng_fallthrough; | |
606828e4 | 675 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 676 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 677 | break; |
b4a75708 | 678 | |
606828e4 | 679 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 680 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 681 | break; |
b4a75708 | 682 | |
c190d76e MJ |
683 | case LTTNG_KERNEL_ABI_FUNCTION: |
684 | lttng_fallthrough; | |
685 | case LTTNG_KERNEL_ABI_NOOP: | |
686 | lttng_fallthrough; | |
a0493bef MD |
687 | default: |
688 | WARN_ON_ONCE(1); | |
689 | ret = -EINVAL; | |
690 | } | |
3c997079 MD |
691 | end: |
692 | mutex_unlock(&sessions_mutex); | |
693 | return ret; | |
e64957da MD |
694 | } |
695 | ||
9d993668 | 696 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
697 | { |
698 | int ret = 0; | |
699 | ||
700 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
701 | switch (event->type) { |
702 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
703 | { | |
704 | struct lttng_kernel_event_recorder *event_recorder = | |
705 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
706 | ||
f7d06400 | 707 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
708 | ret = -EPERM; |
709 | goto end; | |
710 | } | |
b01155ba | 711 | break; |
9d993668 MD |
712 | } |
713 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
714 | switch (event->priv->instrumentation) { | |
715 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
716 | ret = -EINVAL; | |
717 | goto end; | |
718 | default: | |
719 | break; | |
720 | } | |
2b16f0c9 | 721 | break; |
dffef45d | 722 | default: |
9d993668 | 723 | break; |
dffef45d | 724 | } |
dffef45d | 725 | |
a67ba386 | 726 | if (!event->enabled) { |
dffef45d FD |
727 | ret = -EEXIST; |
728 | goto end; | |
729 | } | |
a67ba386 | 730 | switch (event->priv->instrumentation) { |
c190d76e MJ |
731 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
732 | lttng_fallthrough; | |
606828e4 | 733 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
734 | ret = -EINVAL; |
735 | break; | |
b4a75708 | 736 | |
c190d76e MJ |
737 | case LTTNG_KERNEL_ABI_KPROBE: |
738 | lttng_fallthrough; | |
606828e4 | 739 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 740 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 741 | break; |
b4a75708 | 742 | |
9d993668 MD |
743 | case LTTNG_KERNEL_ABI_KRETPROBE: |
744 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
745 | break; | |
746 | ||
c190d76e MJ |
747 | case LTTNG_KERNEL_ABI_FUNCTION: |
748 | lttng_fallthrough; | |
749 | case LTTNG_KERNEL_ABI_NOOP: | |
750 | lttng_fallthrough; | |
dffef45d FD |
751 | default: |
752 | WARN_ON_ONCE(1); | |
753 | ret = -EINVAL; | |
754 | } | |
755 | end: | |
756 | mutex_unlock(&sessions_mutex); | |
757 | return ret; | |
758 | } | |
759 | ||
4e252d1e | 760 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
761 | const char *transport_name, |
762 | void *buf_addr, | |
4e3c1b9b MD |
763 | size_t subbuf_size, size_t num_subbuf, |
764 | unsigned int switch_timer_interval, | |
d83004aa JD |
765 | unsigned int read_timer_interval, |
766 | enum channel_type channel_type) | |
4e3c1b9b | 767 | { |
f7d06400 MD |
768 | struct lttng_kernel_channel_buffer *chan; |
769 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 770 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
771 | |
772 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 773 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 774 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 775 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 776 | if (!transport) { |
5a15f70c | 777 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 778 | transport_name); |
c0e31d2e | 779 | goto notransport; |
f3d01b96 | 780 | } |
a33c9927 | 781 | if (!try_module_get(transport->owner)) { |
5a15f70c | 782 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
783 | goto notransport; |
784 | } | |
f7d06400 | 785 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 786 | if (!chan) |
c0e31d2e | 787 | goto nomem; |
f7d06400 MD |
788 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
789 | if (!chan_priv) | |
790 | goto nomem_priv; | |
791 | chan->priv = chan_priv; | |
792 | chan_priv->pub = chan; | |
793 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
794 | chan->parent.session = session; | |
795 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 796 | chan->ops = &transport->ops; |
125b4df4 MD |
797 | /* |
798 | * Note: the channel creation op already writes into the packet | |
799 | * headers. Therefore the "chan" information used as input | |
800 | * should be already accessible. | |
801 | */ | |
f7d06400 | 802 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
803 | chan, buf_addr, subbuf_size, num_subbuf, |
804 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 805 | if (!chan->priv->rb_chan) |
f3d01b96 | 806 | goto create_error; |
f7d06400 MD |
807 | chan->priv->parent.tstate = 1; |
808 | chan->parent.enabled = 1; | |
809 | chan->priv->transport = transport; | |
810 | chan->priv->channel_type = channel_type; | |
811 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
812 | mutex_unlock(&sessions_mutex); |
813 | return chan; | |
814 | ||
f3d01b96 | 815 | create_error: |
f7d06400 MD |
816 | kfree(chan_priv); |
817 | nomem_priv: | |
f3d01b96 | 818 | kfree(chan); |
c0e31d2e | 819 | nomem: |
a33c9927 MD |
820 | if (transport) |
821 | module_put(transport->owner); | |
c0e31d2e | 822 | notransport: |
e5382b6d | 823 | active: |
4e3c1b9b MD |
824 | mutex_unlock(&sessions_mutex); |
825 | return NULL; | |
826 | } | |
827 | ||
828 | /* | |
d83004aa JD |
829 | * Only used internally at session destruction for per-cpu channels, and |
830 | * when metadata channel is released. | |
831 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 832 | */ |
aa7c23a9 | 833 | static |
f7d06400 | 834 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 835 | { |
f7d06400 MD |
836 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
837 | module_put(chan->priv->transport->owner); | |
838 | list_del(&chan->priv->node); | |
839 | lttng_kernel_destroy_context(chan->priv->ctx); | |
840 | kfree(chan->priv); | |
4e3c1b9b MD |
841 | kfree(chan); |
842 | } | |
843 | ||
f7d06400 | 844 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 845 | { |
f7d06400 | 846 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
847 | |
848 | /* Protect the metadata cache with the sessions_mutex. */ | |
849 | mutex_lock(&sessions_mutex); | |
850 | _lttng_channel_destroy(chan); | |
851 | mutex_unlock(&sessions_mutex); | |
852 | } | |
853 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
854 | ||
855 | static | |
856 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
857 | { | |
858 | stream->finalized = 1; | |
859 | wake_up_interruptible(&stream->read_wait); | |
860 | } | |
861 | ||
51d248b5 MD |
862 | static |
863 | bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler) | |
864 | { | |
865 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
866 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
867 | ||
868 | switch (event_enabler->enabler_type) { | |
869 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
870 | { | |
871 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
872 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
873 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
874 | ||
875 | switch (itype) { | |
876 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
877 | lttng_fallthrough; | |
878 | case LTTNG_KERNEL_ABI_KPROBE: | |
879 | lttng_fallthrough; | |
880 | case LTTNG_KERNEL_ABI_SYSCALL: | |
881 | lttng_fallthrough; | |
882 | case LTTNG_KERNEL_ABI_UPROBE: | |
883 | if (chan->priv->free_event_id == -1U) | |
884 | return false; | |
885 | return true; | |
886 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
887 | /* kretprobes require 2 event IDs. */ | |
888 | if (chan->priv->free_event_id >= -2U) | |
889 | return false; | |
890 | return true; | |
891 | default: | |
892 | WARN_ON_ONCE(1); | |
893 | return false; | |
894 | } | |
895 | } | |
896 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
897 | return true; | |
898 | default: | |
899 | WARN_ON_ONCE(1); | |
900 | return false; | |
901 | } | |
902 | } | |
903 | ||
756a020c MD |
904 | static |
905 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
906 | { | |
907 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
908 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
909 | ||
910 | switch (event_enabler->enabler_type) { | |
911 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
912 | { | |
913 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
914 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
915 | struct lttng_kernel_event_recorder *event_recorder; | |
916 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
917 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
918 | ||
919 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
920 | if (!event_recorder) | |
921 | return NULL; | |
922 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
923 | if (!event_recorder_priv) { | |
924 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
925 | return NULL; | |
926 | } | |
927 | event_recorder_priv->pub = event_recorder; | |
928 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
929 | event_recorder->priv = event_recorder_priv; | |
930 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
931 | ||
932 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
933 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
934 | event_recorder->priv->parent.instrumentation = itype; | |
935 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
936 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
937 | ||
938 | event_recorder->chan = chan; | |
939 | event_recorder->priv->id = chan->priv->free_event_id++; | |
940 | return &event_recorder->parent; | |
941 | } | |
942 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
943 | { | |
944 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
945 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
946 | struct lttng_kernel_event_notifier *event_notifier; | |
947 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
948 | ||
949 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
950 | if (!event_notifier) | |
951 | return NULL; | |
952 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
953 | if (!event_notifier_priv) { | |
954 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
955 | return NULL; | |
956 | } | |
957 | event_notifier_priv->pub = event_notifier; | |
958 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
959 | event_notifier->priv = event_notifier_priv; | |
960 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
961 | ||
962 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
963 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
964 | event_notifier->priv->parent.instrumentation = itype; | |
965 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
966 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
967 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
968 | ||
969 | event_notifier->priv->group = event_notifier_enabler->group; | |
970 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
971 | event_notifier->priv->num_captures = 0; | |
972 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
973 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
974 | return &event_notifier->parent; | |
975 | } | |
976 | default: | |
977 | return NULL; | |
978 | } | |
979 | } | |
980 | ||
981 | static | |
982 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
983 | { | |
984 | switch (event->type) { | |
985 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
986 | { | |
987 | struct lttng_kernel_event_recorder *event_recorder = | |
988 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
989 | ||
990 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
991 | kmem_cache_free(event_recorder_cache, event_recorder); | |
992 | break; | |
993 | } | |
994 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
995 | { | |
996 | struct lttng_kernel_event_notifier *event_notifier = | |
997 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
998 | ||
999 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1000 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1001 | break; | |
1002 | } | |
1003 | default: | |
1004 | WARN_ON_ONCE(1); | |
1005 | } | |
1006 | } | |
a101fa10 | 1007 | |
ccefc7ab MD |
1008 | static |
1009 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
1010 | { | |
1011 | switch (event->type) { | |
1012 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1013 | return 0; | |
1014 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1015 | { | |
1016 | struct lttng_kernel_event_notifier *event_notifier = | |
1017 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1018 | struct lttng_counter *error_counter; | |
1019 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
1020 | size_t dimension_index[1]; | |
1021 | int ret; | |
1022 | ||
1023 | /* | |
1024 | * Clear the error counter bucket. The sessiond keeps track of which | |
1025 | * bucket is currently in use. We trust it. The session lock | |
1026 | * synchronizes against concurrent creation of the error | |
1027 | * counter. | |
1028 | */ | |
1029 | error_counter = event_notifier_group->error_counter; | |
1030 | if (!error_counter) | |
1031 | return 0; | |
1032 | /* | |
1033 | * Check that the index is within the boundary of the counter. | |
1034 | */ | |
1035 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1036 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1037 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
1041 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1042 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1043 | if (ret) { | |
1044 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1045 | event_notifier->priv->error_counter_index); | |
1046 | return -EINVAL; | |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | default: | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | } | |
1054 | ||
e5382b6d MD |
1055 | /* |
1056 | * Supports event creation while tracing session is active. | |
3c997079 | 1057 | * Needs to be called with sessions mutex held. |
e5382b6d | 1058 | */ |
13a2dfca | 1059 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
def1e304 | 1060 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1061 | { |
13a2dfca MD |
1062 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
1063 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); | |
1064 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
def1e304 | 1065 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1066 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1067 | struct lttng_kernel_event_common *event; |
3c997079 MD |
1068 | const char *event_name; |
1069 | struct hlist_head *head; | |
3d084699 | 1070 | int ret; |
4e3c1b9b | 1071 | |
13a2dfca | 1072 | if (!lttng_kernel_event_id_available(event_enabler)) { |
4cf0bf51 | 1073 | ret = -EMFILE; |
e5382b6d | 1074 | goto full; |
abc0446a | 1075 | } |
3c997079 MD |
1076 | |
1077 | switch (itype) { | |
606828e4 | 1078 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1079 | event_name = event_desc->event_name; |
3c997079 | 1080 | break; |
b4a75708 | 1081 | |
c190d76e MJ |
1082 | case LTTNG_KERNEL_ABI_KPROBE: |
1083 | lttng_fallthrough; | |
1084 | case LTTNG_KERNEL_ABI_UPROBE: | |
1085 | lttng_fallthrough; | |
1086 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1087 | lttng_fallthrough; | |
606828e4 | 1088 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1089 | event_name = event_param->name; |
1090 | break; | |
b4a75708 | 1091 | |
c190d76e MJ |
1092 | case LTTNG_KERNEL_ABI_FUNCTION: |
1093 | lttng_fallthrough; | |
1094 | case LTTNG_KERNEL_ABI_NOOP: | |
1095 | lttng_fallthrough; | |
3c997079 MD |
1096 | default: |
1097 | WARN_ON_ONCE(1); | |
1098 | ret = -EINVAL; | |
1099 | goto type_error; | |
1100 | } | |
4a11ef1c | 1101 | |
0def9170 | 1102 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1103 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
13a2dfca | 1104 | if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) { |
3c997079 MD |
1105 | ret = -EEXIST; |
1106 | goto exist; | |
abc0446a MD |
1107 | } |
1108 | } | |
3c997079 | 1109 | |
13a2dfca | 1110 | event = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1111 | if (!event) { |
4cf0bf51 | 1112 | ret = -ENOMEM; |
756a020c | 1113 | goto alloc_error; |
abc0446a | 1114 | } |
3c997079 MD |
1115 | |
1116 | switch (itype) { | |
606828e4 | 1117 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1118 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1119 | event->enabled = 0; |
1120 | event->priv->registered = 0; | |
1121 | event->priv->desc = lttng_event_desc_get(event_name); | |
1122 | if (!event->priv->desc) { | |
4cf0bf51 | 1123 | ret = -ENOENT; |
d3dbe23c | 1124 | goto register_error; |
abc0446a | 1125 | } |
3c997079 MD |
1126 | /* Populate lttng_event structure before event registration. */ |
1127 | smp_wmb(); | |
baf20995 | 1128 | break; |
b4a75708 | 1129 | |
606828e4 | 1130 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1131 | /* |
1132 | * Needs to be explicitly enabled after creation, since | |
1133 | * we may want to apply filters. | |
1134 | */ | |
7cd0f696 MD |
1135 | event->enabled = 0; |
1136 | event->priv->registered = 1; | |
3c997079 MD |
1137 | /* |
1138 | * Populate lttng_event structure before event | |
1139 | * registration. | |
1140 | */ | |
1141 | smp_wmb(); | |
8bf17deb | 1142 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1143 | event_param->u.kprobe.symbol_name, |
1144 | event_param->u.kprobe.offset, | |
1145 | event_param->u.kprobe.addr, | |
7cd0f696 | 1146 | event); |
abc0446a | 1147 | if (ret) { |
4cf0bf51 | 1148 | ret = -EINVAL; |
d6d808f3 | 1149 | goto register_error; |
abc0446a | 1150 | } |
7cd0f696 | 1151 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1152 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1153 | break; |
b4a75708 | 1154 | |
606828e4 | 1155 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1156 | { |
756a020c | 1157 | struct lttng_kernel_event_common *event_return; |
7371f44c MD |
1158 | |
1159 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1160 | /* |
1161 | * Needs to be explicitly enabled after creation, since | |
1162 | * we may want to apply filters. | |
1163 | */ | |
756a020c MD |
1164 | event->enabled = 0; |
1165 | event->priv->registered = 1; | |
a67ba386 | 1166 | |
13a2dfca | 1167 | event_return = lttng_kernel_event_alloc(event_enabler); |
756a020c | 1168 | if (!event) { |
a67ba386 | 1169 | ret = -ENOMEM; |
756a020c | 1170 | goto alloc_error; |
a67ba386 | 1171 | } |
756a020c MD |
1172 | |
1173 | event_return->enabled = 0; | |
1174 | event_return->priv->registered = 1; | |
1175 | ||
7371f44c | 1176 | /* |
a90917c3 | 1177 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1178 | */ |
1179 | smp_wmb(); | |
3c997079 | 1180 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1181 | event_param->u.kretprobe.symbol_name, |
1182 | event_param->u.kretprobe.offset, | |
1183 | event_param->u.kretprobe.addr, | |
756a020c | 1184 | event, event_return); |
7371f44c | 1185 | if (ret) { |
756a020c | 1186 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1187 | ret = -EINVAL; |
7371f44c MD |
1188 | goto register_error; |
1189 | } | |
1190 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1191 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1192 | WARN_ON_ONCE(!ret); |
756a020c | 1193 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1194 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1195 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1196 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1197 | if (ret) { |
756a020c | 1198 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1199 | module_put(event_return->priv->desc->owner); |
1200 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1201 | goto statedump_error; |
1202 | } | |
19b98250 | 1203 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1204 | break; |
1205 | } | |
b4a75708 | 1206 | |
606828e4 | 1207 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1208 | /* |
1209 | * Needs to be explicitly enabled after creation, since | |
1210 | * we may want to apply filters. | |
1211 | */ | |
7cd0f696 MD |
1212 | event->enabled = 0; |
1213 | event->priv->registered = 0; | |
1214 | event->priv->desc = event_desc; | |
badfe9f5 | 1215 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1216 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1217 | ret = -EINVAL; |
1218 | goto register_error; | |
606828e4 | 1219 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1220 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1221 | break; |
606828e4 | 1222 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1223 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1224 | break; |
1225 | } | |
1226 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1227 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1228 | ret = -EINVAL; |
1229 | goto register_error; | |
606828e4 | 1230 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1231 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1232 | break; |
606828e4 | 1233 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1234 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1235 | break; |
1236 | } | |
7cd0f696 | 1237 | if (!event->priv->desc) { |
4cf0bf51 | 1238 | ret = -EINVAL; |
259b6cb3 | 1239 | goto register_error; |
abc0446a | 1240 | } |
1ec65de1 | 1241 | break; |
b4a75708 | 1242 | |
606828e4 | 1243 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1244 | /* |
1245 | * Needs to be explicitly enabled after creation, since | |
1246 | * we may want to apply filters. | |
1247 | */ | |
7cd0f696 MD |
1248 | event->enabled = 0; |
1249 | event->priv->registered = 1; | |
3aed4dca | 1250 | |
a344f64b FD |
1251 | /* |
1252 | * Populate lttng_event structure before event | |
1253 | * registration. | |
1254 | */ | |
1255 | smp_wmb(); | |
149b9a9d | 1256 | |
83b802dc | 1257 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1258 | event_param->u.uprobe.fd, |
7cd0f696 | 1259 | event); |
149b9a9d YB |
1260 | if (ret) |
1261 | goto register_error; | |
7cd0f696 | 1262 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1263 | WARN_ON_ONCE(!ret); |
1264 | break; | |
b4a75708 | 1265 | |
baf20995 MD |
1266 | default: |
1267 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1268 | ret = -EINVAL; |
df07930b | 1269 | goto register_error; |
baf20995 | 1270 | } |
13a2dfca | 1271 | |
ee7e9a18 | 1272 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1273 | WARN_ON_ONCE(ret > 0); |
1274 | if (ret) { | |
c099397a | 1275 | goto statedump_error; |
abc0446a | 1276 | } |
dffef45d | 1277 | |
ccefc7ab MD |
1278 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1279 | if (ret) | |
1280 | goto register_error; | |
c4e31059 | 1281 | |
c4e31059 | 1282 | hlist_add_head(&event->priv->hlist_node, head); |
13a2dfca | 1283 | list_add(&event->priv->node, event_list_head); |
c4e31059 | 1284 | |
13a2dfca | 1285 | return event; |
dffef45d | 1286 | |
13a2dfca MD |
1287 | statedump_error: |
1288 | /* If a statedump error occurs, events will not be readable. */ | |
dffef45d | 1289 | register_error: |
756a020c MD |
1290 | lttng_kernel_event_free(event); |
1291 | alloc_error: | |
dffef45d FD |
1292 | exist: |
1293 | type_error: | |
13a2dfca | 1294 | full: |
dffef45d FD |
1295 | return ERR_PTR(ret); |
1296 | } | |
1297 | ||
83006ee0 MD |
1298 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1299 | const struct lttng_kernel_event_desc *event_desc) | |
1300 | { | |
1301 | struct lttng_kernel_event_common *event; | |
1302 | ||
1303 | mutex_lock(&sessions_mutex); | |
1304 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1305 | mutex_unlock(&sessions_mutex); | |
1306 | return event; | |
1307 | } | |
1308 | ||
99f52fcc FD |
1309 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1310 | const size_t *dim_indexes, int32_t cpu, | |
1311 | int64_t *val, bool *overflow, bool *underflow) | |
1312 | { | |
1313 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1314 | cpu, val, overflow, underflow); | |
1315 | } | |
1316 | ||
1317 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1318 | const size_t *dim_indexes, int64_t *val, | |
1319 | bool *overflow, bool *underflow) | |
1320 | { | |
1321 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1322 | val, overflow, underflow); | |
1323 | } | |
1324 | ||
1325 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1326 | const size_t *dim_indexes) | |
1327 | { | |
1328 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1329 | } | |
1330 | ||
6a338ba4 | 1331 | /* Only used for tracepoints and system calls for now. */ |
3c997079 | 1332 | static |
0c851fa0 | 1333 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1334 | { |
437d5aa5 | 1335 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1336 | int ret = -EINVAL; |
3c997079 | 1337 | |
6a338ba4 | 1338 | WARN_ON_ONCE(event->priv->registered); |
4ecb5ad5 | 1339 | |
0c851fa0 MD |
1340 | desc = event->priv->desc; |
1341 | switch (event->priv->instrumentation) { | |
606828e4 | 1342 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a6837bed | 1343 | ret = lttng_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1344 | desc->tp_class->probe_callback, |
0c851fa0 | 1345 | event); |
4ecb5ad5 | 1346 | break; |
b4a75708 | 1347 | |
606828e4 | 1348 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1349 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1350 | break; |
b4a75708 | 1351 | |
c190d76e MJ |
1352 | case LTTNG_KERNEL_ABI_KPROBE: |
1353 | lttng_fallthrough; | |
1354 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1355 | ret = 0; |
f0bcc14c | 1356 | break; |
0c851fa0 MD |
1357 | |
1358 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1359 | switch (event->type) { | |
1360 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1361 | ret = 0; | |
1362 | break; | |
1363 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1364 | WARN_ON_ONCE(1); | |
1365 | break; | |
1366 | } | |
4ecb5ad5 | 1367 | break; |
b4a75708 | 1368 | |
c190d76e MJ |
1369 | case LTTNG_KERNEL_ABI_FUNCTION: |
1370 | lttng_fallthrough; | |
1371 | case LTTNG_KERNEL_ABI_NOOP: | |
1372 | lttng_fallthrough; | |
4ecb5ad5 MD |
1373 | default: |
1374 | WARN_ON_ONCE(1); | |
1375 | } | |
6a338ba4 | 1376 | WARN_ON_ONCE(ret); |
3c997079 | 1377 | if (!ret) |
0c851fa0 | 1378 | event->priv->registered = 1; |
3c997079 MD |
1379 | } |
1380 | ||
6a338ba4 MD |
1381 | static |
1382 | void unregister_event(struct lttng_kernel_event_common *event) | |
4e3c1b9b | 1383 | { |
f0bcc14c | 1384 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1385 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1386 | int ret = -EINVAL; |
1387 | ||
6a338ba4 | 1388 | WARN_ON_ONCE(!event->priv->registered); |
3c997079 | 1389 | |
a67ba386 MD |
1390 | desc = event_priv->desc; |
1391 | switch (event_priv->instrumentation) { | |
606828e4 | 1392 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a6837bed | 1393 | ret = lttng_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1394 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1395 | event); |
baf20995 | 1396 | break; |
b4a75708 | 1397 | |
606828e4 | 1398 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1399 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1400 | ret = 0; |
1401 | break; | |
b4a75708 | 1402 | |
606828e4 | 1403 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1404 | switch (event->type) { |
1405 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1406 | lttng_kretprobes_unregister(event); | |
1407 | ret = 0; | |
1408 | break; | |
1409 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1410 | WARN_ON_ONCE(1); | |
1411 | break; | |
1412 | } | |
7371f44c | 1413 | break; |
b4a75708 | 1414 | |
606828e4 | 1415 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1416 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1417 | break; |
b4a75708 | 1418 | |
606828e4 | 1419 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1420 | switch (event->type) { |
1421 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1422 | ret = 0; | |
1423 | break; | |
1424 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1425 | WARN_ON_ONCE(1); | |
1426 | break; | |
1427 | } | |
259b6cb3 | 1428 | break; |
b4a75708 | 1429 | |
606828e4 | 1430 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1431 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1432 | ret = 0; |
1433 | break; | |
b4a75708 | 1434 | |
c190d76e MJ |
1435 | case LTTNG_KERNEL_ABI_FUNCTION: |
1436 | lttng_fallthrough; | |
baf20995 MD |
1437 | default: |
1438 | WARN_ON_ONCE(1); | |
1439 | } | |
6a338ba4 | 1440 | WARN_ON_ONCE(ret); |
3c997079 | 1441 | if (!ret) |
a67ba386 | 1442 | event_priv->registered = 0; |
6a338ba4 MD |
1443 | } |
1444 | ||
1445 | static | |
1446 | void _lttng_event_unregister(struct lttng_kernel_event_common *event) | |
1447 | { | |
1448 | if (event->priv->registered) | |
1449 | unregister_event(event); | |
dda6a249 MD |
1450 | } |
1451 | ||
1452 | /* | |
1453 | * Only used internally at session destruction. | |
1454 | */ | |
be066e6c | 1455 | static |
0648898e | 1456 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1457 | { |
0648898e | 1458 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1459 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1460 | ||
0648898e MD |
1461 | lttng_free_event_filter_runtime(event); |
1462 | /* Free event enabler refs */ | |
1463 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1464 | &event_priv->enablers_ref_head, node) | |
1465 | kfree(enabler_ref); | |
b4a75708 | 1466 | |
0648898e MD |
1467 | switch (event->type) { |
1468 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1469 | { | |
1470 | struct lttng_kernel_event_recorder *event_recorder = | |
1471 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1472 | |
0648898e MD |
1473 | switch (event_priv->instrumentation) { |
1474 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1475 | lttng_event_desc_put(event_priv->desc); | |
1476 | break; | |
b4a75708 | 1477 | |
0648898e MD |
1478 | case LTTNG_KERNEL_ABI_KPROBE: |
1479 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1480 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1481 | break; |
b4a75708 | 1482 | |
0648898e MD |
1483 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1484 | module_put(event_priv->desc->owner); | |
eb6b47db | 1485 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1486 | break; |
b4a75708 | 1487 | |
0648898e MD |
1488 | case LTTNG_KERNEL_ABI_SYSCALL: |
1489 | break; | |
4e3c1b9b | 1490 | |
0648898e MD |
1491 | case LTTNG_KERNEL_ABI_UPROBE: |
1492 | module_put(event_priv->desc->owner); | |
17806c46 | 1493 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1494 | break; |
3ef5cc03 | 1495 | |
c190d76e MJ |
1496 | case LTTNG_KERNEL_ABI_FUNCTION: |
1497 | lttng_fallthrough; | |
1498 | case LTTNG_KERNEL_ABI_NOOP: | |
1499 | lttng_fallthrough; | |
0648898e MD |
1500 | default: |
1501 | WARN_ON_ONCE(1); | |
1502 | } | |
f237aef8 | 1503 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1504 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1505 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1506 | break; |
0648898e MD |
1507 | } |
1508 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1509 | { | |
1510 | struct lttng_kernel_event_notifier *event_notifier = | |
1511 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1512 | |
0648898e MD |
1513 | switch (event_notifier->priv->parent.instrumentation) { |
1514 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1515 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1516 | break; | |
b4a75708 | 1517 | |
0648898e MD |
1518 | case LTTNG_KERNEL_ABI_KPROBE: |
1519 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1520 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1521 | break; |
b4a75708 | 1522 | |
0648898e MD |
1523 | case LTTNG_KERNEL_ABI_SYSCALL: |
1524 | break; | |
b4a75708 | 1525 | |
0648898e MD |
1526 | case LTTNG_KERNEL_ABI_UPROBE: |
1527 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1528 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1529 | break; |
1530 | ||
c190d76e MJ |
1531 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1532 | lttng_fallthrough; | |
1533 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1534 | lttng_fallthrough; | |
1535 | case LTTNG_KERNEL_ABI_NOOP: | |
1536 | lttng_fallthrough; | |
0648898e MD |
1537 | default: |
1538 | WARN_ON_ONCE(1); | |
1539 | } | |
f237aef8 | 1540 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1541 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1542 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1543 | break; | |
1544 | } | |
dffef45d FD |
1545 | default: |
1546 | WARN_ON_ONCE(1); | |
1547 | } | |
dffef45d FD |
1548 | } |
1549 | ||
435454a7 | 1550 | static |
8c0393c3 | 1551 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1552 | enum tracker_type tracker_type) |
e0130fab | 1553 | { |
d1f652f8 MD |
1554 | switch (tracker_type) { |
1555 | case TRACKER_PID: | |
1556 | return &session->pid_tracker; | |
1557 | case TRACKER_VPID: | |
1558 | return &session->vpid_tracker; | |
1559 | case TRACKER_UID: | |
1560 | return &session->uid_tracker; | |
1561 | case TRACKER_VUID: | |
1562 | return &session->vuid_tracker; | |
1563 | case TRACKER_GID: | |
1564 | return &session->gid_tracker; | |
1565 | case TRACKER_VGID: | |
1566 | return &session->vgid_tracker; | |
1567 | default: | |
1568 | WARN_ON_ONCE(1); | |
1569 | return NULL; | |
1570 | } | |
1571 | } | |
1572 | ||
8cdc1a81 | 1573 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1574 | enum tracker_type tracker_type, int id) |
1575 | { | |
8c0393c3 | 1576 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1577 | int ret; |
1578 | ||
d1f652f8 MD |
1579 | tracker = get_tracker(session, tracker_type); |
1580 | if (!tracker) | |
1581 | return -EINVAL; | |
1582 | if (id < -1) | |
e0130fab MD |
1583 | return -EINVAL; |
1584 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1585 | if (id == -1) { |
1586 | /* track all ids: destroy tracker. */ | |
1587 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1588 | ret = 0; |
1589 | } else { | |
d1f652f8 | 1590 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1591 | } |
e0130fab MD |
1592 | mutex_unlock(&sessions_mutex); |
1593 | return ret; | |
1594 | } | |
1595 | ||
8cdc1a81 | 1596 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1597 | enum tracker_type tracker_type, int id) |
e0130fab | 1598 | { |
8c0393c3 | 1599 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1600 | int ret; |
1601 | ||
d1f652f8 MD |
1602 | tracker = get_tracker(session, tracker_type); |
1603 | if (!tracker) | |
1604 | return -EINVAL; | |
1605 | if (id < -1) | |
e0130fab MD |
1606 | return -EINVAL; |
1607 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1608 | if (id == -1) { |
1609 | /* untrack all ids: replace by empty tracker. */ | |
1610 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1611 | } else { |
d1f652f8 | 1612 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1613 | } |
e0130fab MD |
1614 | mutex_unlock(&sessions_mutex); |
1615 | return ret; | |
1616 | } | |
1617 | ||
7e6f9ef6 | 1618 | static |
d1f652f8 | 1619 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1620 | { |
8c0393c3 MD |
1621 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1622 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1623 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1624 | int iter = 0, i; |
1625 | ||
1626 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1627 | if (id_tracker_p) { |
1628 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1629 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1630 | |
f934e302 | 1631 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1632 | if (iter++ >= *pos) |
1633 | return e; | |
1634 | } | |
1635 | } | |
1636 | } else { | |
d1f652f8 | 1637 | /* ID tracker disabled. */ |
7e6f9ef6 | 1638 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1639 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1640 | } |
1641 | iter++; | |
1642 | } | |
1643 | /* End of list */ | |
1644 | return NULL; | |
1645 | } | |
1646 | ||
1647 | /* Called with sessions_mutex held. */ | |
1648 | static | |
d1f652f8 | 1649 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1650 | { |
8c0393c3 MD |
1651 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1652 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1653 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1654 | int iter = 0, i; |
1655 | ||
1656 | (*ppos)++; | |
d1f652f8 MD |
1657 | if (id_tracker_p) { |
1658 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1659 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1660 | |
f934e302 | 1661 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1662 | if (iter++ >= *ppos) |
1663 | return e; | |
1664 | } | |
1665 | } | |
1666 | } else { | |
d1f652f8 | 1667 | /* ID tracker disabled. */ |
7e6f9ef6 | 1668 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1669 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1670 | iter++; |
1671 | } | |
1672 | ||
1673 | /* End of list */ | |
1674 | return NULL; | |
1675 | } | |
1676 | ||
1677 | static | |
d1f652f8 | 1678 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1679 | { |
1680 | mutex_unlock(&sessions_mutex); | |
1681 | } | |
1682 | ||
1683 | static | |
d1f652f8 | 1684 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1685 | { |
8c0393c3 MD |
1686 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1687 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1688 | int id; |
7e6f9ef6 | 1689 | |
d1f652f8 | 1690 | if (p == id_tracker_p) { |
7e6f9ef6 | 1691 | /* Tracker disabled. */ |
d1f652f8 | 1692 | id = -1; |
7e6f9ef6 | 1693 | } else { |
d1f652f8 | 1694 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1695 | |
d1f652f8 MD |
1696 | id = lttng_id_tracker_get_node_id(e); |
1697 | } | |
8c0393c3 | 1698 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1699 | case TRACKER_PID: |
1700 | seq_printf(m, "process { pid = %d; };\n", id); | |
1701 | break; | |
1702 | case TRACKER_VPID: | |
1703 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1704 | break; | |
1705 | case TRACKER_UID: | |
1706 | seq_printf(m, "user { uid = %d; };\n", id); | |
1707 | break; | |
1708 | case TRACKER_VUID: | |
1709 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1710 | break; | |
1711 | case TRACKER_GID: | |
1712 | seq_printf(m, "group { gid = %d; };\n", id); | |
1713 | break; | |
1714 | case TRACKER_VGID: | |
1715 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1716 | break; | |
1717 | default: | |
1718 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1719 | } |
7e6f9ef6 MD |
1720 | return 0; |
1721 | } | |
1722 | ||
1723 | static | |
d1f652f8 MD |
1724 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1725 | .start = id_list_start, | |
1726 | .next = id_list_next, | |
1727 | .stop = id_list_stop, | |
1728 | .show = id_list_show, | |
7e6f9ef6 MD |
1729 | }; |
1730 | ||
1731 | static | |
d1f652f8 | 1732 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1733 | { |
d1f652f8 | 1734 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1735 | } |
1736 | ||
1737 | static | |
d1f652f8 | 1738 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1739 | { |
1740 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1741 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1742 | int ret; |
1743 | ||
d1f652f8 | 1744 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1745 | ret = seq_release(inode, file); |
d1f652f8 | 1746 | if (!ret) |
8c0393c3 | 1747 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1748 | return ret; |
1749 | } | |
1750 | ||
d1f652f8 | 1751 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1752 | .owner = THIS_MODULE, |
d1f652f8 | 1753 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1754 | .read = seq_read, |
1755 | .llseek = seq_lseek, | |
d1f652f8 | 1756 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1757 | }; |
1758 | ||
8cdc1a81 | 1759 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1760 | enum tracker_type tracker_type) |
7e6f9ef6 | 1761 | { |
d1f652f8 | 1762 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1763 | struct seq_file *m; |
1764 | int file_fd, ret; | |
1765 | ||
2a059b14 | 1766 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1767 | if (file_fd < 0) { |
1768 | ret = file_fd; | |
1769 | goto fd_error; | |
1770 | } | |
1771 | ||
d1f652f8 MD |
1772 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1773 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1774 | NULL, O_RDWR); |
d1f652f8 MD |
1775 | if (IS_ERR(tracker_ids_list_file)) { |
1776 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1777 | goto file_error; |
1778 | } | |
8cdc1a81 | 1779 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1780 | ret = -EOVERFLOW; |
9c1f4643 MD |
1781 | goto refcount_error; |
1782 | } | |
d1f652f8 | 1783 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1784 | if (ret < 0) |
1785 | goto open_error; | |
d1f652f8 MD |
1786 | m = tracker_ids_list_file->private_data; |
1787 | ||
1788 | m->private = get_tracker(session, tracker_type); | |
1789 | BUG_ON(!m->private); | |
1790 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1791 | |
1792 | return file_fd; | |
1793 | ||
1794 | open_error: | |
8cdc1a81 | 1795 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1796 | refcount_error: |
d1f652f8 | 1797 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1798 | file_error: |
1799 | put_unused_fd(file_fd); | |
1800 | fd_error: | |
1801 | return ret; | |
1802 | } | |
1803 | ||
3c997079 MD |
1804 | /* |
1805 | * Enabler management. | |
1806 | */ | |
1807 | static | |
4993071a PP |
1808 | int lttng_match_enabler_star_glob(const char *desc_name, |
1809 | const char *pattern) | |
3c997079 | 1810 | { |
cbc19040 MD |
1811 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1812 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1813 | return 0; |
1814 | return 1; | |
1815 | } | |
1816 | ||
1817 | static | |
4ecb5ad5 MD |
1818 | int lttng_match_enabler_name(const char *desc_name, |
1819 | const char *name) | |
3c997079 | 1820 | { |
4ecb5ad5 | 1821 | if (strcmp(desc_name, name)) |
3c997079 MD |
1822 | return 0; |
1823 | return 1; | |
1824 | } | |
1825 | ||
8bff0fc3 MD |
1826 | static |
1827 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1828 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1829 | { |
4ecb5ad5 | 1830 | const char *desc_name, *enabler_name; |
badfe9f5 | 1831 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1832 | |
1833 | enabler_name = enabler->event_param.name; | |
1834 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1835 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1836 | desc_name = desc->event_name; |
3b861b22 FD |
1837 | switch (enabler->format_type) { |
1838 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1839 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1840 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1841 | return lttng_match_enabler_name(desc_name, enabler_name); |
1842 | default: | |
1843 | return -EINVAL; | |
1844 | } | |
4ecb5ad5 | 1845 | break; |
b4a75708 | 1846 | |
606828e4 | 1847 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1848 | desc_name = desc->event_name; |
badfe9f5 | 1849 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1850 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1851 | compat = true; |
1852 | } | |
4ecb5ad5 MD |
1853 | if (!strncmp(desc_name, "syscall_exit_", |
1854 | strlen("syscall_exit_"))) { | |
1855 | desc_name += strlen("syscall_exit_"); | |
1856 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1857 | strlen("syscall_entry_"))) { | |
1858 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1859 | entry = true; |
4ecb5ad5 MD |
1860 | } else { |
1861 | WARN_ON_ONCE(1); | |
1862 | return -EINVAL; | |
1863 | } | |
badfe9f5 | 1864 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1865 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1866 | break; |
606828e4 | 1867 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1868 | if (!entry) |
1869 | return 0; | |
1870 | break; | |
606828e4 | 1871 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1872 | if (entry) |
1873 | return 0; | |
1874 | break; | |
1875 | default: | |
1876 | return -EINVAL; | |
1877 | } | |
1878 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1879 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1880 | break; |
606828e4 | 1881 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1882 | if (compat) |
1883 | return 0; | |
1884 | break; | |
606828e4 | 1885 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1886 | if (!compat) |
1887 | return 0; | |
1888 | break; | |
1889 | default: | |
1890 | return -EINVAL; | |
1891 | } | |
1892 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1893 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1894 | switch (enabler->format_type) { |
1895 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1896 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1897 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1898 | return lttng_match_enabler_name(desc_name, enabler_name); |
1899 | default: | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | break; | |
606828e4 | 1903 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1904 | return -EINVAL; /* Not implemented. */ |
1905 | default: | |
1906 | return -EINVAL; | |
1907 | } | |
4ecb5ad5 | 1908 | break; |
b4a75708 | 1909 | |
4ecb5ad5 MD |
1910 | default: |
1911 | WARN_ON_ONCE(1); | |
1912 | return -EINVAL; | |
1913 | } | |
3c997079 MD |
1914 | } |
1915 | ||
8bff0fc3 MD |
1916 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
1917 | struct lttng_event_enabler_common *enabler) | |
1918 | { | |
1919 | int ret; | |
1920 | ||
1921 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
1922 | if (ret < 0) { | |
1923 | WARN_ON_ONCE(1); | |
1924 | return false; | |
1925 | } | |
1926 | return ret; | |
1927 | } | |
1928 | ||
5c6ec66a MD |
1929 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
1930 | struct lttng_kernel_event_common *event) | |
3c997079 | 1931 | { |
5c6ec66a MD |
1932 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1933 | return false; | |
b2bc0bc8 | 1934 | |
5c6ec66a MD |
1935 | switch (event_enabler->enabler_type) { |
1936 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1937 | { | |
1938 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1939 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1940 | struct lttng_kernel_event_recorder *event_recorder = | |
1941 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1942 | ||
1943 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1944 | && event_recorder->chan == event_recorder_enabler->chan) | |
1945 | return true; | |
1946 | else | |
1947 | return false; | |
1948 | } | |
1949 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1950 | { | |
1951 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1952 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1953 | struct lttng_kernel_event_notifier *event_notifier = | |
1954 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1955 | ||
1956 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
1957 | && event_notifier->priv->group == event_notifier_enabler->group | |
1958 | && event->priv->user_token == event_enabler->user_token) | |
1959 | return true; | |
1960 | else | |
1961 | return false; | |
1962 | } | |
1963 | default: | |
1964 | WARN_ON_ONCE(1); | |
1965 | return false; | |
1966 | } | |
3c997079 MD |
1967 | } |
1968 | ||
5c6ec66a MD |
1969 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
1970 | const struct lttng_kernel_event_desc *desc, | |
1971 | struct lttng_kernel_event_common *event) | |
b01155ba | 1972 | { |
5c6ec66a MD |
1973 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
1974 | return false; | |
b01155ba | 1975 | |
5c6ec66a MD |
1976 | switch (event_enabler->enabler_type) { |
1977 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1978 | { | |
1979 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1980 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1981 | struct lttng_kernel_event_recorder *event_recorder = | |
1982 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
1983 | ||
1984 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
1985 | return true; | |
1986 | else | |
1987 | return false; | |
1988 | } | |
1989 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1990 | { | |
1991 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1992 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1993 | struct lttng_kernel_event_notifier *event_notifier = | |
1994 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
1995 | ||
1996 | if (event->priv->desc == desc | |
1997 | && event_notifier->priv->group == event_notifier_enabler->group | |
1998 | && event->priv->user_token == event_enabler->user_token) | |
1999 | return true; | |
2000 | else | |
2001 | return false; | |
2002 | } | |
2003 | default: | |
2004 | WARN_ON_ONCE(1); | |
2005 | return false; | |
2006 | } | |
b01155ba FD |
2007 | } |
2008 | ||
0d223dc6 MD |
2009 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2010 | const char *event_name, | |
2011 | struct lttng_kernel_event_common *event) | |
2012 | { | |
2013 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2014 | return false; | |
2015 | ||
2016 | switch (event_enabler->enabler_type) { | |
2017 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2018 | { | |
2019 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2020 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2021 | struct lttng_kernel_event_recorder *event_recorder = | |
2022 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2023 | ||
2024 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2025 | && event_recorder->chan == event_recorder_enabler->chan) | |
2026 | return true; | |
2027 | else | |
2028 | return false; | |
2029 | } | |
2030 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2031 | { | |
2032 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2033 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2034 | struct lttng_kernel_event_notifier *event_notifier = | |
2035 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2036 | ||
2037 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2038 | && event_notifier->priv->group == event_notifier_enabler->group | |
2039 | && event->priv->user_token == event_enabler->user_token) | |
2040 | return true; | |
2041 | else | |
2042 | return false; | |
2043 | } | |
2044 | default: | |
2045 | WARN_ON_ONCE(1); | |
2046 | return false; | |
2047 | } | |
2048 | } | |
2049 | ||
3c997079 | 2050 | static |
b2bc0bc8 FD |
2051 | struct lttng_enabler_ref *lttng_enabler_ref( |
2052 | struct list_head *enablers_ref_list, | |
8d554755 | 2053 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2054 | { |
2055 | struct lttng_enabler_ref *enabler_ref; | |
2056 | ||
b2bc0bc8 | 2057 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2058 | if (enabler_ref->ref == enabler) |
2059 | return enabler_ref; | |
2060 | } | |
2061 | return NULL; | |
2062 | } | |
2063 | ||
3c997079 | 2064 | static |
b2f63bde | 2065 | void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2066 | { |
c8e14380 | 2067 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2068 | struct lttng_kernel_probe_desc *probe_desc; |
2069 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2070 | struct list_head *probe_list; |
c8e14380 | 2071 | int i; |
3c997079 MD |
2072 | |
2073 | probe_list = lttng_get_probe_list_head(); | |
2074 | /* | |
2075 | * For each probe event, if we find that a probe event matches | |
2076 | * our enabler, create an associated lttng_event if not | |
2077 | * already present. | |
2078 | */ | |
2079 | list_for_each_entry(probe_desc, probe_list, head) { | |
2080 | for (i = 0; i < probe_desc->nr_events; i++) { | |
58969906 | 2081 | bool found = false; |
3c997079 | 2082 | struct hlist_head *head; |
83006ee0 | 2083 | struct lttng_kernel_event_common *event; |
19bef247 | 2084 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2085 | |
2086 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2087 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2088 | continue; |
3c997079 MD |
2089 | |
2090 | /* | |
2091 | * Check if already created. | |
2092 | */ | |
0def9170 | 2093 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2094 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
58969906 MD |
2095 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
2096 | found = true; | |
2097 | break; | |
2098 | } | |
3c997079 MD |
2099 | } |
2100 | if (found) | |
2101 | continue; | |
2102 | ||
2103 | /* | |
83006ee0 | 2104 | * We need to create an event for this event probe. |
3c997079 | 2105 | */ |
c8e14380 | 2106 | event = _lttng_kernel_event_create(event_enabler, desc); |
c3fb484e | 2107 | if (IS_ERR(event)) { |
5a15f70c | 2108 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2109 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2110 | } |
2111 | } | |
2112 | } | |
2113 | } | |
2114 | ||
33a39a3c | 2115 | /* |
8839618b | 2116 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2117 | * Should be called with sessions mutex held. |
2118 | */ | |
2119 | static | |
b2f63bde | 2120 | void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2121 | { |
b2f63bde MD |
2122 | int ret; |
2123 | ||
8839618b | 2124 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2125 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b2f63bde | 2126 | lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler); |
33a39a3c | 2127 | break; |
b4a75708 | 2128 | |
606828e4 | 2129 | case LTTNG_KERNEL_ABI_SYSCALL: |
b2f63bde MD |
2130 | ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler); |
2131 | WARN_ON_ONCE(ret); | |
33a39a3c | 2132 | break; |
b4a75708 | 2133 | |
33a39a3c MD |
2134 | default: |
2135 | WARN_ON_ONCE(1); | |
2136 | break; | |
2137 | } | |
2138 | } | |
2139 | ||
d619fae9 MD |
2140 | static |
2141 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2142 | struct lttng_kernel_event_common *event) | |
2143 | { | |
2144 | /* Link filter bytecodes if not linked yet. */ | |
2145 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2146 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2147 | } | |
2148 | ||
1e06b222 MD |
2149 | static |
2150 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2151 | struct lttng_kernel_event_common *event) | |
2152 | { | |
2153 | switch (event_enabler->enabler_type) { | |
2154 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2155 | break; | |
2156 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2157 | { | |
2158 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2159 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2160 | struct lttng_kernel_event_notifier *event_notifier = | |
2161 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2162 | ||
2163 | /* Link capture bytecodes if not linked yet. */ | |
2164 | lttng_enabler_link_bytecode(event->priv->desc, | |
2165 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2166 | &event_notifier_enabler->capture_bytecode_head); | |
2167 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2168 | break; | |
2169 | } | |
2170 | default: | |
2171 | WARN_ON_ONCE(1); | |
2172 | } | |
2173 | } | |
2174 | ||
3c997079 | 2175 | /* |
b2bc0bc8 | 2176 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2177 | * and add backward reference from the event to the enabler. |
2178 | * Should be called with sessions mutex held. | |
2179 | */ | |
2180 | static | |
3622cd47 | 2181 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2182 | { |
3622cd47 MD |
2183 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2184 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2185 | |
3622cd47 | 2186 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2187 | |
3c997079 | 2188 | /* First ensure that probe events are created for this enabler. */ |
b2f63bde | 2189 | lttng_event_enabler_create_events_if_missing(event_enabler); |
3c997079 | 2190 | |
3622cd47 MD |
2191 | /* Link the created event with its associated enabler. */ |
2192 | list_for_each_entry(event_priv, event_list_head, node) { | |
2193 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2194 | struct lttng_enabler_ref *enabler_ref; |
2195 | ||
3622cd47 | 2196 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2197 | continue; |
2198 | ||
3622cd47 | 2199 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2200 | if (!enabler_ref) { |
2201 | /* | |
2202 | * If no backward ref, create it. | |
2203 | * Add backward ref from event_notifier to enabler. | |
2204 | */ | |
2205 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2206 | if (!enabler_ref) | |
2207 | return -ENOMEM; | |
2208 | ||
3622cd47 MD |
2209 | enabler_ref->ref = event_enabler; |
2210 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2211 | } |
2212 | ||
3622cd47 MD |
2213 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2214 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2215 | } |
2216 | return 0; | |
2217 | } | |
2218 | ||
3c997079 MD |
2219 | /* |
2220 | * Called at module load: connect the probe on all enablers matching | |
2221 | * this event. | |
2222 | * Called with sessions lock held. | |
2223 | */ | |
2224 | int lttng_fix_pending_events(void) | |
2225 | { | |
8cdc1a81 | 2226 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2227 | |
8cdc1a81 MD |
2228 | list_for_each_entry(session_priv, &sessions, list) |
2229 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2230 | return 0; |
2231 | } | |
2232 | ||
b01155ba FD |
2233 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2234 | struct lttng_event_notifier_group *event_notifier_group) | |
2235 | { | |
09710b83 | 2236 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2237 | |
09710b83 MD |
2238 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2239 | if (event_enabler->enabled) | |
b01155ba FD |
2240 | return true; |
2241 | } | |
2242 | return false; | |
2243 | } | |
2244 | ||
2245 | bool lttng_event_notifier_active(void) | |
2246 | { | |
2247 | struct lttng_event_notifier_group *event_notifier_group; | |
2248 | ||
2249 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2250 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2251 | return true; | |
2252 | } | |
2253 | return false; | |
2254 | } | |
2255 | ||
2256 | int lttng_fix_pending_event_notifiers(void) | |
2257 | { | |
2258 | struct lttng_event_notifier_group *event_notifier_group; | |
2259 | ||
2260 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2261 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2262 | return 0; | |
2263 | } | |
2264 | ||
1ae083ba | 2265 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2266 | enum lttng_enabler_format_type format_type, |
606828e4 | 2267 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2268 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2269 | { |
1ae083ba | 2270 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2271 | |
b2bc0bc8 FD |
2272 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2273 | if (!event_enabler) | |
3c997079 | 2274 | return NULL; |
0bb716a8 | 2275 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2276 | event_enabler->parent.format_type = format_type; |
2277 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2278 | memcpy(&event_enabler->parent.event_param, event_param, | |
2279 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2280 | event_enabler->chan = chan; |
3c997079 | 2281 | /* ctx left NULL */ |
5b9817ae | 2282 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2283 | return event_enabler; |
2284 | } | |
2285 | ||
2286 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2287 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2288 | { |
3c997079 | 2289 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2290 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2291 | event_enabler->parent.published = true; | |
def1e304 | 2292 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2293 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2294 | } |
2295 | ||
7b25ab0e | 2296 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2297 | { |
2298 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2299 | event_enabler->enabled = 1; |
2300 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2301 | mutex_unlock(&sessions_mutex); |
2302 | return 0; | |
2303 | } | |
2304 | ||
7b25ab0e | 2305 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2306 | { |
2307 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2308 | event_enabler->enabled = 0; |
2309 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2310 | mutex_unlock(&sessions_mutex); |
2311 | return 0; | |
2312 | } | |
2313 | ||
b2bc0bc8 | 2314 | static |
8d554755 | 2315 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2316 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2317 | { |
d64ca521 | 2318 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2319 | uint32_t bytecode_len; |
2320 | int ret; | |
2321 | ||
2322 | ret = get_user(bytecode_len, &bytecode->len); | |
2323 | if (ret) | |
2324 | return ret; | |
52cfcdf3 | 2325 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2326 | GFP_KERNEL); |
2327 | if (!bytecode_node) | |
2328 | return -ENOMEM; | |
2329 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2330 | sizeof(*bytecode) + bytecode_len); | |
2331 | if (ret) | |
2332 | goto error_free; | |
b2bc0bc8 | 2333 | |
8a445457 | 2334 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2335 | bytecode_node->enabler = enabler; |
2336 | /* Enforce length based on allocated size */ | |
2337 | bytecode_node->bc.len = bytecode_len; | |
2338 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2339 | |
07dfc1d0 MD |
2340 | return 0; |
2341 | ||
2342 | error_free: | |
52cfcdf3 | 2343 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2344 | return ret; |
2345 | } | |
2346 | ||
6048044f | 2347 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2348 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2349 | { |
2350 | int ret; | |
6048044f | 2351 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2352 | if (ret) |
2353 | goto error; | |
7b25ab0e | 2354 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2355 | return 0; |
2356 | ||
2357 | error: | |
2358 | return ret; | |
2359 | } | |
2360 | ||
e2d5dbc7 | 2361 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2362 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2363 | { |
2364 | ||
e2d5dbc7 | 2365 | switch (event->priv->instrumentation) { |
606828e4 | 2366 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2367 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2368 | default: |
2369 | return -EINVAL; | |
2370 | } | |
2371 | } | |
2372 | ||
3c997079 | 2373 | static |
8d554755 | 2374 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2375 | { |
d64ca521 | 2376 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2377 | |
2378 | /* Destroy filter bytecode */ | |
2379 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2380 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2381 | lttng_kvfree(filter_node); |
07dfc1d0 | 2382 | } |
b2bc0bc8 FD |
2383 | } |
2384 | ||
44b1abdc | 2385 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2386 | { |
09710b83 MD |
2387 | lttng_enabler_destroy(event_enabler); |
2388 | if (event_enabler->published) | |
2389 | list_del(&event_enabler->node); | |
2390 | ||
44b1abdc MD |
2391 | switch (event_enabler->enabler_type) { |
2392 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2393 | { | |
2394 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2395 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2396 | ||
44b1abdc MD |
2397 | kfree(event_recorder_enabler); |
2398 | break; | |
2399 | } | |
2400 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2401 | { | |
2402 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2403 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2404 | |
44b1abdc MD |
2405 | kfree(event_notifier_enabler); |
2406 | break; | |
2407 | } | |
2408 | default: | |
2409 | WARN_ON_ONCE(1); | |
2410 | } | |
3c997079 MD |
2411 | } |
2412 | ||
dffef45d | 2413 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2414 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2415 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2416 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2417 | { |
2418 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2419 | ||
2420 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2421 | if (!event_notifier_enabler) | |
2422 | return NULL; | |
2423 | ||
0bb716a8 | 2424 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2425 | event_notifier_enabler->parent.format_type = format_type; |
2426 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2427 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2428 | ||
99f52fcc | 2429 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2430 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2431 | |
5b9817ae MD |
2432 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2433 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2434 | |
5b9817ae MD |
2435 | event_notifier_enabler->parent.enabled = 0; |
2436 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2437 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2438 | return event_notifier_enabler; |
2439 | } | |
dffef45d | 2440 | |
1bbb5b2d MD |
2441 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2442 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2443 | { | |
dffef45d | 2444 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2445 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2446 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2447 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2448 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2449 | } |
2450 | ||
2451 | int lttng_event_notifier_enabler_enable( | |
2452 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2453 | { | |
2454 | mutex_lock(&sessions_mutex); | |
2455 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2456 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2457 | mutex_unlock(&sessions_mutex); |
2458 | return 0; | |
2459 | } | |
2460 | ||
2461 | int lttng_event_notifier_enabler_disable( | |
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 = 0; | |
b01155ba | 2466 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2467 | mutex_unlock(&sessions_mutex); |
2468 | return 0; | |
2469 | } | |
2470 | ||
99d223ad FD |
2471 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2472 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2473 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2474 | { |
d64ca521 | 2475 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2476 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2477 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2478 | uint32_t bytecode_len; | |
2479 | int ret; | |
2480 | ||
2481 | ret = get_user(bytecode_len, &bytecode->len); | |
2482 | if (ret) | |
2483 | return ret; | |
2484 | ||
2485 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2486 | GFP_KERNEL); | |
2487 | if (!bytecode_node) | |
2488 | return -ENOMEM; | |
2489 | ||
2490 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2491 | sizeof(*bytecode) + bytecode_len); | |
2492 | if (ret) | |
2493 | goto error_free; | |
2494 | ||
8a445457 | 2495 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2496 | bytecode_node->enabler = enabler; |
2497 | ||
2498 | /* Enforce length based on allocated size */ | |
2499 | bytecode_node->bc.len = bytecode_len; | |
2500 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2501 | ||
2502 | event_notifier_enabler->num_captures++; | |
2503 | ||
2504 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2505 | goto end; | |
2506 | ||
2507 | error_free: | |
2508 | lttng_kvfree(bytecode_node); | |
2509 | end: | |
2510 | return ret; | |
2511 | } | |
2512 | ||
cc5719b1 MD |
2513 | static |
2514 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2515 | { | |
2516 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2517 | struct lttng_kernel_bytecode_runtime *runtime; | |
2518 | struct lttng_enabler_ref *enabler_ref; | |
2519 | ||
2520 | /* Check if has enablers without bytecode enabled */ | |
2521 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2522 | if (enabler_ref->ref->enabled | |
2523 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2524 | has_enablers_without_filter_bytecode = 1; | |
2525 | break; | |
2526 | } | |
2527 | } | |
2528 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2529 | ||
2530 | /* Enable filters */ | |
2531 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2532 | lttng_bytecode_sync_state(runtime); | |
2533 | nr_filters++; | |
2534 | } | |
2535 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2536 | } | |
2537 | ||
2538 | static | |
2539 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2540 | { | |
2541 | switch (event->type) { | |
2542 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2543 | break; | |
2544 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2545 | { | |
2546 | struct lttng_kernel_event_notifier *event_notifier = | |
2547 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2548 | struct lttng_kernel_bytecode_runtime *runtime; | |
2549 | int nr_captures = 0; | |
2550 | ||
2551 | /* Enable captures */ | |
2552 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2553 | lttng_bytecode_sync_state(runtime); | |
2554 | nr_captures++; | |
2555 | } | |
2556 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2557 | break; | |
2558 | } | |
2559 | default: | |
2560 | WARN_ON_ONCE(1); | |
2561 | } | |
2562 | } | |
2563 | ||
a0c6ad2e MD |
2564 | static |
2565 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2566 | { | |
2567 | struct lttng_enabler_ref *enabler_ref; | |
2568 | bool enabled = false; | |
2569 | ||
2570 | switch (event->priv->instrumentation) { | |
2571 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2572 | lttng_fallthrough; | |
2573 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2574 | /* Enable events */ | |
2575 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2576 | if (enabler_ref->ref->enabled) { | |
2577 | enabled = true; | |
2578 | break; | |
2579 | } | |
2580 | } | |
2581 | break; | |
2582 | default: | |
2583 | WARN_ON_ONCE(1); | |
2584 | return false; | |
2585 | } | |
2586 | ||
2587 | switch (event->type) { | |
2588 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2589 | { | |
2590 | struct lttng_kernel_event_recorder *event_recorder = | |
2591 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2592 | ||
2593 | /* | |
2594 | * Enabled state is based on union of enablers, with | |
2595 | * intersection of session and channel transient enable | |
2596 | * states. | |
2597 | */ | |
2598 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2599 | } | |
2600 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2601 | return enabled; | |
2602 | default: | |
2603 | WARN_ON_ONCE(1); | |
2604 | return false; | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | static | |
2609 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2610 | { | |
2611 | switch (event->priv->instrumentation) { | |
2612 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2613 | lttng_fallthrough; | |
2614 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2615 | return true; | |
2616 | ||
2617 | default: | |
2618 | /* Not handled with lazy sync. */ | |
2619 | return false; | |
2620 | } | |
2621 | } | |
2622 | ||
3c997079 | 2623 | /* |
3c997079 MD |
2624 | * Should be called with sessions mutex held. |
2625 | */ | |
2626 | static | |
a0c6ad2e MD |
2627 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2628 | struct list_head *event_list) | |
3c997079 | 2629 | { |
a0c6ad2e | 2630 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2631 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2632 | |
a0c6ad2e | 2633 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2634 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2635 | |
3c997079 MD |
2636 | /* |
2637 | * For each event, if at least one of its enablers is enabled, | |
2638 | * and its channel and session transient states are enabled, we | |
2639 | * enable the event, else we disable it. | |
2640 | */ | |
a0c6ad2e MD |
2641 | list_for_each_entry(event_priv, event_list, node) { |
2642 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2643 | bool enabled; | |
b4a75708 | 2644 | |
a0c6ad2e | 2645 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2646 | continue; |
3c997079 | 2647 | |
a0c6ad2e MD |
2648 | enabled = lttng_get_event_enabled_state(event); |
2649 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2650 | /* |
a0c6ad2e | 2651 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2652 | */ |
2653 | if (enabled) { | |
6a338ba4 MD |
2654 | if (!event_priv->registered) |
2655 | register_event(event); | |
3c997079 | 2656 | } else { |
6a338ba4 MD |
2657 | if (event_priv->registered) |
2658 | unregister_event(event); | |
3c997079 | 2659 | } |
07dfc1d0 | 2660 | |
a0c6ad2e MD |
2661 | lttng_event_sync_filter_state(event); |
2662 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2663 | } |
2664 | } | |
2665 | ||
a0c6ad2e MD |
2666 | /* |
2667 | * lttng_session_sync_event_enablers should be called just before starting a | |
2668 | * session. | |
2669 | */ | |
2670 | static | |
2671 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2672 | { | |
2673 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2674 | } | |
2675 | ||
3c997079 MD |
2676 | /* |
2677 | * Apply enablers to session events, adding events to session if need | |
2678 | * be. It is required after each modification applied to an active | |
2679 | * session, and right before session "start". | |
2680 | * "lazy" sync means we only sync if required. | |
2681 | * Should be called with sessions mutex held. | |
2682 | */ | |
2683 | static | |
8cdc1a81 | 2684 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2685 | { |
2686 | /* We can skip if session is not active */ | |
2687 | if (!session->active) | |
2688 | return; | |
b2bc0bc8 | 2689 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2690 | } |
2691 | ||
b01155ba FD |
2692 | static |
2693 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2694 | { | |
a0c6ad2e | 2695 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2696 | } |
2697 | ||
7b25ab0e MD |
2698 | static |
2699 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2700 | { | |
2701 | switch (event_enabler->enabler_type) { | |
2702 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2703 | { | |
2704 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2705 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2706 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2707 | break; | |
2708 | } | |
2709 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2710 | { | |
2711 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2712 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2713 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2714 | break; | |
2715 | } | |
2716 | default: | |
2717 | WARN_ON_ONCE(1); | |
2718 | } | |
2719 | } | |
2720 | ||
1ec3f75a | 2721 | /* |
d83004aa JD |
2722 | * Serialize at most one packet worth of metadata into a metadata |
2723 | * channel. | |
92d9f5e6 MD |
2724 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2725 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2726 | * allows us to do racy operations such as looking for remaining space left in | |
2727 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2728 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2729 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2730 | * Returns the number of bytes written in the channel, 0 if no data |
2731 | * was written and a negative value on error. | |
1ec3f75a | 2732 | */ |
b3b8072b | 2733 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2734 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2735 | { |
8a57ec02 | 2736 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2737 | int ret = 0; |
2738 | size_t len, reserve_len; | |
2739 | ||
f613e3e6 | 2740 | /* |
92d9f5e6 MD |
2741 | * Ensure we support mutiple get_next / put sequences followed by |
2742 | * put_next. The metadata cache lock protects reading the metadata | |
2743 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2744 | * "flush" operations on the buffer invoked by different processes. | |
2745 | * Moreover, since the metadata cache memory can be reallocated, we | |
2746 | * need to have exclusive access against updates even though we only | |
2747 | * read it. | |
f613e3e6 | 2748 | */ |
92d9f5e6 | 2749 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2750 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2751 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2752 | goto end; |
f613e3e6 | 2753 | |
9616f0bf JD |
2754 | /* Metadata regenerated, change the version. */ |
2755 | if (stream->metadata_cache->version != stream->version) | |
2756 | stream->version = stream->metadata_cache->version; | |
2757 | ||
d83004aa | 2758 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2759 | stream->metadata_in; |
9de2c215 | 2760 | if (!len) |
de23d59d | 2761 | goto end; |
d83004aa | 2762 | reserve_len = min_t(size_t, |
4a399b76 | 2763 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2764 | len); |
a775608d | 2765 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2766 | sizeof(char), NULL); |
d83004aa JD |
2767 | /* |
2768 | * If reservation failed, return an error to the caller. | |
2769 | */ | |
c2fb9c1c | 2770 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2771 | if (ret != 0) { |
2772 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2773 | stream->coherent = false; |
d83004aa JD |
2774 | goto end; |
2775 | } | |
b3b8072b | 2776 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2777 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2778 | reserve_len, 1); |
b3b8072b | 2779 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2780 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2781 | if (reserve_len < len) |
8b97fd42 MD |
2782 | stream->coherent = false; |
2783 | else | |
2784 | stream->coherent = true; | |
d83004aa JD |
2785 | ret = reserve_len; |
2786 | ||
2787 | end: | |
8b97fd42 MD |
2788 | if (coherent) |
2789 | *coherent = stream->coherent; | |
92d9f5e6 | 2790 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2791 | return ret; |
2792 | } | |
2793 | ||
8b97fd42 | 2794 | static |
8cdc1a81 | 2795 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2796 | { |
8cdc1a81 MD |
2797 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2798 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2799 | } |
2800 | ||
2801 | static | |
8cdc1a81 | 2802 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2803 | { |
8cdc1a81 MD |
2804 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2805 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2806 | struct lttng_metadata_stream *stream; |
2807 | ||
8cdc1a81 | 2808 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2809 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2810 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2811 | } |
8b97fd42 MD |
2812 | } |
2813 | ||
d83004aa JD |
2814 | /* |
2815 | * Write the metadata to the metadata cache. | |
2816 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2817 | * The metadata cache lock protects us from concurrent read access from |
2818 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2819 | * The content of the printf is printed as a single atomic metadata |
2820 | * transaction. | |
d83004aa | 2821 | */ |
435454a7 | 2822 | static |
8cdc1a81 | 2823 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2824 | const char *fmt, ...) |
2825 | { | |
c099397a | 2826 | char *str; |
d83004aa | 2827 | size_t len; |
c099397a MD |
2828 | va_list ap; |
2829 | ||
585e5dcc | 2830 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2831 | |
2832 | va_start(ap, fmt); | |
2833 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2834 | va_end(ap); | |
2835 | if (!str) | |
2836 | return -ENOMEM; | |
2837 | ||
1ec3f75a | 2838 | len = strlen(str); |
8cdc1a81 MD |
2839 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2840 | if (session->priv->metadata_cache->metadata_written + len > | |
2841 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2842 | char *tmp_cache_realloc; |
2843 | unsigned int tmp_cache_alloc_size; | |
2844 | ||
2845 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2846 | session->priv->metadata_cache->cache_alloc + len, |
2847 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2848 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2849 | if (!tmp_cache_realloc) |
2850 | goto err; | |
8cdc1a81 | 2851 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2852 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2853 | session->priv->metadata_cache->data, |
2854 | session->priv->metadata_cache->cache_alloc); | |
2855 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2856 | } |
2857 | ||
8cdc1a81 MD |
2858 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2859 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2860 | } |
8cdc1a81 MD |
2861 | memcpy(session->priv->metadata_cache->data + |
2862 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 2863 | str, len); |
8cdc1a81 | 2864 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 2865 | kfree(str); |
d83004aa | 2866 | |
d83004aa JD |
2867 | return 0; |
2868 | ||
2869 | err: | |
2870 | kfree(str); | |
2871 | return -ENOMEM; | |
c099397a MD |
2872 | } |
2873 | ||
f513b2bf | 2874 | static |
8cdc1a81 | 2875 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
2876 | { |
2877 | size_t i; | |
2878 | ||
2879 | for (i = 0; i < nesting; i++) { | |
2880 | int ret; | |
2881 | ||
2882 | ret = lttng_metadata_printf(session, " "); | |
2883 | if (ret) { | |
2884 | return ret; | |
2885 | } | |
2886 | } | |
2887 | return 0; | |
2888 | } | |
2889 | ||
ceabb767 | 2890 | static |
8cdc1a81 | 2891 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2892 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
2893 | size_t nesting) |
2894 | { | |
2895 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2896 | } | |
2897 | ||
2898 | static | |
8cdc1a81 | 2899 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
2900 | const struct lttng_kernel_type_integer *type, |
2901 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
2902 | size_t nesting) |
2903 | { | |
2904 | int ret; | |
2905 | ||
ceabb767 MD |
2906 | ret = print_tabs(session, nesting); |
2907 | if (ret) | |
2908 | return ret; | |
2909 | ret = lttng_metadata_printf(session, | |
2910 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
2911 | type->size, |
2912 | type->alignment, | |
2913 | type->signedness, | |
2914 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 2915 | ? "none" |
437d5aa5 | 2916 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
2917 | ? "UTF8" |
2918 | : "ASCII", | |
437d5aa5 | 2919 | type->base, |
ceabb767 | 2920 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 2921 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 2922 | #else |
437d5aa5 | 2923 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
2924 | #endif |
2925 | ); | |
2926 | return ret; | |
2927 | } | |
2928 | ||
f513b2bf MD |
2929 | /* |
2930 | * Must be called with sessions_mutex held. | |
2931 | */ | |
2932 | static | |
8cdc1a81 | 2933 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2934 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
2935 | size_t nesting) |
2936 | { | |
51ef4536 | 2937 | const char *prev_field_name = NULL; |
f513b2bf MD |
2938 | int ret; |
2939 | uint32_t i, nr_fields; | |
ceabb767 MD |
2940 | unsigned int alignment; |
2941 | ||
f513b2bf MD |
2942 | ret = print_tabs(session, nesting); |
2943 | if (ret) | |
2944 | return ret; | |
2945 | ret = lttng_metadata_printf(session, | |
2946 | "struct {\n"); | |
2947 | if (ret) | |
2948 | return ret; | |
437d5aa5 | 2949 | nr_fields = type->nr_fields; |
f513b2bf | 2950 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 2951 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 2952 | |
437d5aa5 | 2953 | iter_field = type->fields[i]; |
51ef4536 | 2954 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
2955 | if (ret) |
2956 | return ret; | |
2957 | } | |
2958 | ret = print_tabs(session, nesting); | |
2959 | if (ret) | |
2960 | return ret; | |
437d5aa5 | 2961 | alignment = type->alignment; |
ceabb767 MD |
2962 | if (alignment) { |
2963 | ret = lttng_metadata_printf(session, | |
2964 | "} align(%u)", | |
2965 | alignment); | |
2966 | } else { | |
2967 | ret = lttng_metadata_printf(session, | |
2968 | "}"); | |
2969 | } | |
f513b2bf MD |
2970 | return ret; |
2971 | } | |
2972 | ||
2973 | /* | |
2974 | * Must be called with sessions_mutex held. | |
2975 | */ | |
2976 | static | |
8cdc1a81 | 2977 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2978 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
2979 | size_t nesting) |
2980 | { | |
2981 | int ret; | |
2982 | ||
2983 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 2984 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
2985 | if (ret) |
2986 | return ret; | |
ceabb767 | 2987 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2988 | } |
2989 | ||
65c85aa6 MD |
2990 | /* |
2991 | * Must be called with sessions_mutex held. | |
2992 | */ | |
2993 | static | |
8cdc1a81 | 2994 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 2995 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
2996 | size_t nesting, |
2997 | const char *prev_field_name) | |
65c85aa6 | 2998 | { |
51ef4536 | 2999 | const char *tag_name; |
65c85aa6 MD |
3000 | int ret; |
3001 | uint32_t i, nr_choices; | |
3002 | ||
51ef4536 MD |
3003 | tag_name = type->tag_name; |
3004 | if (!tag_name) | |
3005 | tag_name = prev_field_name; | |
3006 | if (!tag_name) | |
3007 | return -EINVAL; | |
ceabb767 MD |
3008 | /* |
3009 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3010 | */ | |
437d5aa5 | 3011 | if (type->alignment != 0) |
ceabb767 | 3012 | return -EINVAL; |
65c85aa6 MD |
3013 | ret = print_tabs(session, nesting); |
3014 | if (ret) | |
3015 | return ret; | |
3016 | ret = lttng_metadata_printf(session, | |
3017 | "variant <_%s> {\n", | |
51ef4536 | 3018 | tag_name); |
65c85aa6 MD |
3019 | if (ret) |
3020 | return ret; | |
437d5aa5 | 3021 | nr_choices = type->nr_choices; |
65c85aa6 | 3022 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3023 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3024 | |
437d5aa5 | 3025 | iter_field = type->choices[i]; |
51ef4536 | 3026 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3027 | if (ret) |
3028 | return ret; | |
3029 | } | |
3030 | ret = print_tabs(session, nesting); | |
3031 | if (ret) | |
3032 | return ret; | |
3033 | ret = lttng_metadata_printf(session, | |
3034 | "}"); | |
3035 | return ret; | |
3036 | } | |
3037 | ||
3038 | /* | |
3039 | * Must be called with sessions_mutex held. | |
3040 | */ | |
3041 | static | |
8cdc1a81 | 3042 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3043 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3044 | size_t nesting, |
3045 | const char *prev_field_name) | |
65c85aa6 MD |
3046 | { |
3047 | int ret; | |
3048 | ||
3049 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3050 | lttng_kernel_get_type_variant(field->type), nesting, |
3051 | prev_field_name); | |
65c85aa6 MD |
3052 | if (ret) |
3053 | return ret; | |
ceabb767 | 3054 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3055 | } |
3056 | ||
f513b2bf MD |
3057 | /* |
3058 | * Must be called with sessions_mutex held. | |
3059 | */ | |
3060 | static | |
8cdc1a81 | 3061 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3062 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3063 | size_t nesting) |
3064 | { | |
3065 | int ret; | |
437d5aa5 MD |
3066 | const struct lttng_kernel_type_array *array_type; |
3067 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3068 | |
437d5aa5 MD |
3069 | array_type = lttng_kernel_get_type_array(field->type); |
3070 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3071 | |
437d5aa5 | 3072 | if (array_type->alignment) { |
ceabb767 | 3073 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3074 | if (ret) |
3075 | return ret; | |
ceabb767 MD |
3076 | ret = lttng_metadata_printf(session, |
3077 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3078 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3079 | field->name); |
3080 | if (ret) | |
3081 | return ret; | |
3082 | } | |
3083 | /* | |
3084 | * Nested compound types: Only array of structures and variants are | |
3085 | * currently supported. | |
3086 | */ | |
437d5aa5 | 3087 | elem_type = array_type->elem_type; |
12bb2edb MD |
3088 | switch (elem_type->type) { |
3089 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3090 | case lttng_kernel_type_struct: |
3091 | case lttng_kernel_type_variant: | |
3092 | ret = _lttng_type_statedump(session, elem_type, | |
3093 | array_type->encoding, nesting); | |
65c85aa6 MD |
3094 | if (ret) |
3095 | return ret; | |
3096 | break; | |
ceabb767 | 3097 | |
f513b2bf MD |
3098 | default: |
3099 | return -EINVAL; | |
3100 | } | |
3101 | ret = lttng_metadata_printf(session, | |
3102 | " _%s[%u];\n", | |
3103 | field->name, | |
437d5aa5 | 3104 | array_type->length); |
f513b2bf MD |
3105 | return ret; |
3106 | } | |
3107 | ||
3108 | /* | |
3109 | * Must be called with sessions_mutex held. | |
3110 | */ | |
3111 | static | |
8cdc1a81 | 3112 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3113 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3114 | size_t nesting, |
3115 | const char *prev_field_name) | |
f513b2bf MD |
3116 | { |
3117 | int ret; | |
3118 | const char *length_name; | |
437d5aa5 MD |
3119 | const struct lttng_kernel_type_sequence *sequence_type; |
3120 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3121 | |
437d5aa5 MD |
3122 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3123 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3124 | |
437d5aa5 | 3125 | length_name = sequence_type->length_name; |
51ef4536 MD |
3126 | if (!length_name) |
3127 | length_name = prev_field_name; | |
3128 | if (!length_name) | |
3129 | return -EINVAL; | |
ceabb767 | 3130 | |
437d5aa5 | 3131 | if (sequence_type->alignment) { |
ceabb767 | 3132 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3133 | if (ret) |
3134 | return ret; | |
ceabb767 MD |
3135 | ret = lttng_metadata_printf(session, |
3136 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3137 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3138 | field->name); |
3139 | if (ret) | |
3140 | return ret; | |
3141 | } | |
3142 | ||
3143 | /* | |
3144 | * Nested compound types: Only array of structures and variants are | |
3145 | * currently supported. | |
3146 | */ | |
437d5aa5 | 3147 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3148 | switch (elem_type->type) { |
3149 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3150 | case lttng_kernel_type_struct: |
3151 | case lttng_kernel_type_variant: | |
3152 | ret = _lttng_type_statedump(session, elem_type, | |
3153 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3154 | if (ret) |
3155 | return ret; | |
3156 | break; | |
ceabb767 | 3157 | |
f513b2bf MD |
3158 | default: |
3159 | return -EINVAL; | |
3160 | } | |
3161 | ret = lttng_metadata_printf(session, | |
3162 | " _%s[ _%s ];\n", | |
3163 | field->name, | |
51ef4536 | 3164 | length_name); |
f513b2bf MD |
3165 | return ret; |
3166 | } | |
3167 | ||
141ddf28 MD |
3168 | /* |
3169 | * Must be called with sessions_mutex held. | |
3170 | */ | |
3171 | static | |
8cdc1a81 | 3172 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3173 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3174 | size_t nesting) |
3175 | { | |
d96a4a7a | 3176 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3177 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3178 | int ret; |
3179 | unsigned int i, nr_entries; | |
3180 | ||
437d5aa5 | 3181 | container_type = type->container_type; |
12bb2edb | 3182 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3183 | ret = -EINVAL; |
3184 | goto end; | |
3185 | } | |
437d5aa5 | 3186 | enum_desc = type->desc; |
141ddf28 MD |
3187 | nr_entries = enum_desc->nr_entries; |
3188 | ||
3189 | ret = print_tabs(session, nesting); | |
3190 | if (ret) | |
3191 | goto end; | |
ceabb767 MD |
3192 | ret = lttng_metadata_printf(session, "enum : "); |
3193 | if (ret) | |
3194 | goto end; | |
437d5aa5 MD |
3195 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3196 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3197 | if (ret) |
ceabb767 MD |
3198 | goto end; |
3199 | ret = lttng_metadata_printf(session, " {\n"); | |
3200 | if (ret) | |
3201 | goto end; | |
141ddf28 MD |
3202 | /* Dump all entries */ |
3203 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3204 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3205 | int j, len; |
3206 | ||
3207 | ret = print_tabs(session, nesting + 1); | |
3208 | if (ret) | |
3209 | goto end; | |
3210 | ret = lttng_metadata_printf(session, | |
3211 | "\""); | |
3212 | if (ret) | |
3213 | goto end; | |
3214 | len = strlen(entry->string); | |
3215 | /* Escape the character '"' */ | |
3216 | for (j = 0; j < len; j++) { | |
3217 | char c = entry->string[j]; | |
3218 | ||
3219 | switch (c) { | |
3220 | case '"': | |
3221 | ret = lttng_metadata_printf(session, | |
3222 | "\\\""); | |
3223 | break; | |
3224 | case '\\': | |
3225 | ret = lttng_metadata_printf(session, | |
3226 | "\\\\"); | |
3227 | break; | |
3228 | default: | |
3229 | ret = lttng_metadata_printf(session, | |
3230 | "%c", c); | |
3231 | break; | |
3232 | } | |
3233 | if (ret) | |
3234 | goto end; | |
3235 | } | |
08ad1061 PP |
3236 | ret = lttng_metadata_printf(session, "\""); |
3237 | if (ret) | |
3238 | goto end; | |
3239 | ||
3240 | if (entry->options.is_auto) { | |
3241 | ret = lttng_metadata_printf(session, ",\n"); | |
3242 | if (ret) | |
3243 | goto end; | |
141ddf28 | 3244 | } else { |
7c559490 MD |
3245 | ret = lttng_metadata_printf(session, |
3246 | " = "); | |
3247 | if (ret) | |
3248 | goto end; | |
3249 | if (entry->start.signedness) | |
141ddf28 | 3250 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3251 | "%lld", (long long) entry->start.value); |
3252 | else | |
3253 | ret = lttng_metadata_printf(session, | |
3254 | "%llu", entry->start.value); | |
3255 | if (ret) | |
3256 | goto end; | |
3257 | if (entry->start.signedness == entry->end.signedness && | |
3258 | entry->start.value | |
3259 | == entry->end.value) { | |
141ddf28 | 3260 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3261 | ",\n"); |
3262 | } else { | |
3263 | if (entry->end.signedness) { | |
3264 | ret = lttng_metadata_printf(session, | |
3265 | " ... %lld,\n", | |
3266 | (long long) entry->end.value); | |
3267 | } else { | |
3268 | ret = lttng_metadata_printf(session, | |
3269 | " ... %llu,\n", | |
3270 | entry->end.value); | |
3271 | } | |
141ddf28 | 3272 | } |
7c559490 MD |
3273 | if (ret) |
3274 | goto end; | |
141ddf28 | 3275 | } |
141ddf28 MD |
3276 | } |
3277 | ret = print_tabs(session, nesting); | |
3278 | if (ret) | |
3279 | goto end; | |
ceabb767 | 3280 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3281 | end: |
3282 | return ret; | |
3283 | } | |
3284 | ||
d83004aa JD |
3285 | /* |
3286 | * Must be called with sessions_mutex held. | |
3287 | */ | |
c099397a | 3288 | static |
8cdc1a81 | 3289 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3290 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3291 | size_t nesting) |
3292 | { | |
3293 | int ret; | |
437d5aa5 | 3294 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3295 | |
437d5aa5 MD |
3296 | enum_type = lttng_kernel_get_type_enum(field->type); |
3297 | WARN_ON_ONCE(!enum_type); | |
3298 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3299 | if (ret) |
3300 | return ret; | |
3301 | return lttng_field_name_statedump(session, field, nesting); | |
3302 | } | |
3303 | ||
3304 | static | |
8cdc1a81 | 3305 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3306 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3307 | size_t nesting) |
3308 | { | |
3309 | int ret; | |
3310 | ||
437d5aa5 MD |
3311 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3312 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3313 | if (ret) |
3314 | return ret; | |
3315 | return lttng_field_name_statedump(session, field, nesting); | |
3316 | } | |
3317 | ||
3318 | static | |
8cdc1a81 | 3319 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3320 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3321 | size_t nesting) |
3322 | { | |
3323 | int ret; | |
3324 | ||
ceabb767 MD |
3325 | /* Default encoding is UTF8 */ |
3326 | ret = print_tabs(session, nesting); | |
3327 | if (ret) | |
3328 | return ret; | |
3329 | ret = lttng_metadata_printf(session, | |
3330 | "string%s", | |
437d5aa5 | 3331 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3332 | " { encoding = ASCII; }" : ""); |
3333 | return ret; | |
3334 | } | |
3335 | ||
3336 | static | |
8cdc1a81 | 3337 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3338 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3339 | size_t nesting) |
ceabb767 | 3340 | { |
437d5aa5 | 3341 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3342 | int ret; |
3343 | ||
437d5aa5 MD |
3344 | string_type = lttng_kernel_get_type_string(field->type); |
3345 | WARN_ON_ONCE(!string_type); | |
3346 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3347 | if (ret) |
3348 | return ret; | |
3349 | return lttng_field_name_statedump(session, field, nesting); | |
3350 | } | |
3351 | ||
3352 | /* | |
3353 | * Must be called with sessions_mutex held. | |
3354 | */ | |
3355 | static | |
8cdc1a81 | 3356 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3357 | const struct lttng_kernel_type_common *type, |
3358 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3359 | size_t nesting) |
c099397a | 3360 | { |
c099397a | 3361 | int ret = 0; |
c099397a | 3362 | |
12bb2edb MD |
3363 | switch (type->type) { |
3364 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3365 | ret = _lttng_integer_type_statedump(session, |
3366 | lttng_kernel_get_type_integer(type), | |
3367 | parent_encoding, nesting); | |
8070f5c0 | 3368 | break; |
437d5aa5 MD |
3369 | case lttng_kernel_type_enum: |
3370 | ret = _lttng_enum_type_statedump(session, | |
3371 | lttng_kernel_get_type_enum(type), | |
3372 | nesting); | |
8070f5c0 | 3373 | break; |
12bb2edb | 3374 | case lttng_kernel_type_string: |
437d5aa5 MD |
3375 | ret = _lttng_string_type_statedump(session, |
3376 | lttng_kernel_get_type_string(type), | |
3377 | nesting); | |
ceabb767 | 3378 | break; |
437d5aa5 MD |
3379 | case lttng_kernel_type_struct: |
3380 | ret = _lttng_struct_type_statedump(session, | |
3381 | lttng_kernel_get_type_struct(type), | |
3382 | nesting); | |
8070f5c0 | 3383 | break; |
437d5aa5 MD |
3384 | case lttng_kernel_type_variant: |
3385 | ret = _lttng_variant_type_statedump(session, | |
3386 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3387 | nesting, NULL); |
ceabb767 MD |
3388 | break; |
3389 | ||
3390 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3391 | case lttng_kernel_type_array: |
3392 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3393 | default: |
3394 | WARN_ON_ONCE(1); | |
3395 | return -EINVAL; | |
8070f5c0 | 3396 | } |
ceabb767 MD |
3397 | return ret; |
3398 | } | |
8070f5c0 | 3399 | |
ceabb767 MD |
3400 | /* |
3401 | * Must be called with sessions_mutex held. | |
3402 | */ | |
3403 | static | |
8cdc1a81 | 3404 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3405 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3406 | size_t nesting, |
3407 | const char **prev_field_name_p) | |
ceabb767 | 3408 | { |
51ef4536 | 3409 | const char *prev_field_name = NULL; |
ceabb767 | 3410 | int ret = 0; |
27d2368e | 3411 | |
51ef4536 MD |
3412 | if (prev_field_name_p) |
3413 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3414 | switch (field->type->type) { |
12bb2edb | 3415 | case lttng_kernel_type_integer: |
ceabb767 MD |
3416 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3417 | break; | |
437d5aa5 | 3418 | case lttng_kernel_type_enum: |
ceabb767 | 3419 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3420 | break; |
12bb2edb | 3421 | case lttng_kernel_type_string: |
ceabb767 | 3422 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3423 | break; |
437d5aa5 | 3424 | case lttng_kernel_type_struct: |
ceabb767 | 3425 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3426 | break; |
437d5aa5 | 3427 | case lttng_kernel_type_array: |
ceabb767 | 3428 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3429 | break; |
437d5aa5 | 3430 | case lttng_kernel_type_sequence: |
51ef4536 | 3431 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3432 | break; |
437d5aa5 | 3433 | case lttng_kernel_type_variant: |
51ef4536 | 3434 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3435 | break; |
f513b2bf | 3436 | |
8070f5c0 MD |
3437 | default: |
3438 | WARN_ON_ONCE(1); | |
3439 | return -EINVAL; | |
3440 | } | |
51ef4536 MD |
3441 | if (prev_field_name_p) |
3442 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3443 | return ret; |
3444 | } | |
3445 | ||
3446 | static | |
8cdc1a81 | 3447 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3448 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3449 | { |
51ef4536 | 3450 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3451 | int ret = 0; |
3452 | int i; | |
3453 | ||
3454 | if (!ctx) | |
3455 | return 0; | |
3456 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3457 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3458 | |
51ef4536 | 3459 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3460 | if (ret) |
3461 | return ret; | |
3462 | } | |
3463 | return ret; | |
3464 | } | |
3465 | ||
3466 | static | |
8cdc1a81 | 3467 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3468 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3469 | { |
51ef4536 | 3470 | const char *prev_field_name = NULL; |
a67ba386 | 3471 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3472 | int ret = 0; |
3473 | int i; | |
3474 | ||
6c8c025b MD |
3475 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3476 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3477 | |
51ef4536 | 3478 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3479 | if (ret) |
3480 | return ret; | |
c099397a MD |
3481 | } |
3482 | return ret; | |
3483 | } | |
3484 | ||
d83004aa JD |
3485 | /* |
3486 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3487 | * The entire event metadata is printed as a single atomic metadata |
3488 | * transaction. | |
d83004aa | 3489 | */ |
c099397a | 3490 | static |
ee7e9a18 | 3491 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3492 | { |
ee7e9a18 MD |
3493 | struct lttng_kernel_event_recorder *event_recorder; |
3494 | struct lttng_kernel_channel_buffer *chan; | |
3495 | struct lttng_kernel_session *session; | |
c099397a MD |
3496 | int ret = 0; |
3497 | ||
ee7e9a18 MD |
3498 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3499 | return 0; | |
3500 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3501 | chan = event_recorder->chan; | |
3502 | session = chan->parent.session; | |
3503 | ||
a67ba386 | 3504 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3505 | return 0; |
f7d06400 | 3506 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3507 | return 0; |
3508 | ||
8b97fd42 MD |
3509 | lttng_metadata_begin(session); |
3510 | ||
c099397a MD |
3511 | ret = lttng_metadata_printf(session, |
3512 | "event {\n" | |
ae734547 | 3513 | " name = \"%s\";\n" |
c099397a | 3514 | " id = %u;\n" |
b9074a1b | 3515 | " stream_id = %u;\n", |
a67ba386 MD |
3516 | event_recorder->priv->parent.desc->event_name, |
3517 | event_recorder->priv->id, | |
f7d06400 | 3518 | event_recorder->chan->priv->id); |
c099397a MD |
3519 | if (ret) |
3520 | goto end; | |
3521 | ||
8070f5c0 | 3522 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3523 | " fields := struct {\n" |
3524 | ); | |
3525 | if (ret) | |
3526 | goto end; | |
3527 | ||
a67ba386 | 3528 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3529 | if (ret) |
3530 | goto end; | |
3531 | ||
3532 | /* | |
3533 | * LTTng space reservation can only reserve multiples of the | |
3534 | * byte size. | |
3535 | */ | |
3536 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3537 | " };\n" |
3538 | "};\n\n"); | |
c099397a MD |
3539 | if (ret) |
3540 | goto end; | |
3541 | ||
a67ba386 | 3542 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3543 | end: |
8b97fd42 | 3544 | lttng_metadata_end(session); |
c099397a MD |
3545 | return ret; |
3546 | ||
3547 | } | |
3548 | ||
d83004aa JD |
3549 | /* |
3550 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3551 | * The entire channel metadata is printed as a single atomic metadata |
3552 | * transaction. | |
d83004aa | 3553 | */ |
c099397a | 3554 | static |
8cdc1a81 | 3555 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3556 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3557 | { |
3558 | int ret = 0; | |
3559 | ||
f7d06400 | 3560 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3561 | return 0; |
d83004aa | 3562 | |
f7d06400 | 3563 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3564 | return 0; |
3565 | ||
8b97fd42 MD |
3566 | lttng_metadata_begin(session); |
3567 | ||
f7d06400 | 3568 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3569 | ret = lttng_metadata_printf(session, |
3570 | "stream {\n" | |
3571 | " id = %u;\n" | |
9115fbdc | 3572 | " event.header := %s;\n" |
b9074a1b | 3573 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3574 | chan->priv->id, |
3575 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3576 | "struct event_header_large"); |
3577 | if (ret) | |
3578 | goto end; | |
3579 | ||
f7d06400 | 3580 | if (chan->priv->ctx) { |
b9074a1b MD |
3581 | ret = lttng_metadata_printf(session, |
3582 | " event.context := struct {\n"); | |
3583 | if (ret) | |
3584 | goto end; | |
3585 | } | |
f7d06400 | 3586 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3587 | if (ret) |
3588 | goto end; | |
f7d06400 | 3589 | if (chan->priv->ctx) { |
b9074a1b MD |
3590 | ret = lttng_metadata_printf(session, |
3591 | " };\n"); | |
3592 | if (ret) | |
3593 | goto end; | |
3594 | } | |
8070f5c0 MD |
3595 | |
3596 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3597 | "};\n\n"); |
8070f5c0 | 3598 | |
f7d06400 | 3599 | chan->priv->metadata_dumped = 1; |
c099397a | 3600 | end: |
8b97fd42 | 3601 | lttng_metadata_end(session); |
c099397a MD |
3602 | return ret; |
3603 | } | |
3604 | ||
d83004aa JD |
3605 | /* |
3606 | * Must be called with sessions_mutex held. | |
3607 | */ | |
9115fbdc | 3608 | static |
8cdc1a81 | 3609 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3610 | { |
3611 | return lttng_metadata_printf(session, | |
3612 | "struct packet_context {\n" | |
a3ccff4f MD |
3613 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3614 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3615 | " uint64_t content_size;\n" |
3616 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3617 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3618 | " unsigned long events_discarded;\n" |
9115fbdc | 3619 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3620 | "};\n\n" |
9115fbdc MD |
3621 | ); |
3622 | } | |
3623 | ||
3624 | /* | |
3625 | * Compact header: | |
3626 | * id: range: 0 - 30. | |
3627 | * id 31 is reserved to indicate an extended header. | |
3628 | * | |
3629 | * Large header: | |
3630 | * id: range: 0 - 65534. | |
3631 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3632 | * |
3633 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3634 | */ |
3635 | static | |
8cdc1a81 | 3636 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3637 | { |
3638 | return lttng_metadata_printf(session, | |
3639 | "struct event_header_compact {\n" | |
3640 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3641 | " variant <id> {\n" | |
3642 | " struct {\n" | |
a3ccff4f | 3643 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3644 | " } compact;\n" |
3645 | " struct {\n" | |
3646 | " uint32_t id;\n" | |
a3ccff4f | 3647 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3648 | " } extended;\n" |
3649 | " } v;\n" | |
3650 | "} align(%u);\n" | |
3651 | "\n" | |
3652 | "struct event_header_large {\n" | |
3653 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3654 | " variant <id> {\n" | |
3655 | " struct {\n" | |
a3ccff4f | 3656 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3657 | " } compact;\n" |
3658 | " struct {\n" | |
3659 | " uint32_t id;\n" | |
a3ccff4f | 3660 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3661 | " } extended;\n" |
3662 | " } v;\n" | |
3663 | "} align(%u);\n\n", | |
a90917c3 MD |
3664 | lttng_alignof(uint32_t) * CHAR_BIT, |
3665 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3666 | ); |
3667 | } | |
3668 | ||
a3ccff4f MD |
3669 | /* |
3670 | * Approximation of NTP time of day to clock monotonic correlation, | |
3671 | * taken at start of trace. | |
3672 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3673 | * in future versions. | |
5283350b MD |
3674 | * This function may return a negative offset. It may happen if the |
3675 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3676 | * |
3677 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3678 | * y2038 compliant. | |
a3ccff4f MD |
3679 | */ |
3680 | static | |
8967b2a3 | 3681 | int64_t measure_clock_offset(void) |
a3ccff4f | 3682 | { |
dcb93448 | 3683 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3684 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3685 | int64_t offset; |
a3ccff4f | 3686 | unsigned long flags; |
3636085f | 3687 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
3688 | |
3689 | /* Disable interrupts to increase correlation precision. */ | |
3690 | local_irq_save(flags); | |
3691 | monotonic[0] = trace_clock_read64(); | |
3636085f | 3692 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
3693 | monotonic[1] = trace_clock_read64(); |
3694 | local_irq_restore(flags); | |
3695 | ||
dcb93448 | 3696 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3697 | realtime = (uint64_t) rts.tv_sec * tcf; |
3698 | if (tcf == NSEC_PER_SEC) { | |
3699 | realtime += rts.tv_nsec; | |
3700 | } else { | |
3701 | uint64_t n = rts.tv_nsec * tcf; | |
3702 | ||
3703 | do_div(n, NSEC_PER_SEC); | |
3704 | realtime += n; | |
3705 | } | |
dcb93448 | 3706 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3707 | return offset; |
3708 | } | |
3709 | ||
3eb95be4 | 3710 | static |
8cdc1a81 | 3711 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3712 | { |
0f3eaad4 | 3713 | int ret = 0; |
3eb95be4 JR |
3714 | size_t i; |
3715 | char cur; | |
3716 | ||
3717 | i = 0; | |
3718 | cur = string[i]; | |
3719 | while (cur != '\0') { | |
3720 | switch (cur) { | |
3721 | case '\n': | |
3722 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3723 | break; | |
3724 | case '\\': | |
3725 | case '"': | |
3726 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3727 | if (ret) | |
3728 | goto error; | |
3729 | /* We still print the current char */ | |
c190d76e | 3730 | lttng_fallthrough; |
3eb95be4 JR |
3731 | default: |
3732 | ret = lttng_metadata_printf(session, "%c", cur); | |
3733 | break; | |
3734 | } | |
3735 | ||
3736 | if (ret) | |
3737 | goto error; | |
3738 | ||
3739 | cur = string[++i]; | |
3740 | } | |
3741 | error: | |
3742 | return ret; | |
3743 | } | |
3744 | ||
3745 | static | |
8cdc1a81 | 3746 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3747 | const char *field_value) |
3eb95be4 JR |
3748 | { |
3749 | int ret; | |
3750 | ||
1c88f269 | 3751 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3752 | if (ret) |
3753 | goto error; | |
3754 | ||
1c88f269 | 3755 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3756 | if (ret) |
3757 | goto error; | |
3758 | ||
3759 | ret = lttng_metadata_printf(session, "\";\n"); | |
3760 | ||
3761 | error: | |
3762 | return ret; | |
3763 | } | |
3764 | ||
c099397a MD |
3765 | /* |
3766 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3767 | * Must be called with sessions_mutex held. |
c099397a MD |
3768 | */ |
3769 | static | |
8cdc1a81 | 3770 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3771 | { |
8cdc1a81 | 3772 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3773 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3774 | const char *product_uuid; |
f7d06400 | 3775 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3776 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3777 | int ret = 0; |
3778 | ||
585e5dcc | 3779 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3780 | return 0; |
8b97fd42 MD |
3781 | |
3782 | lttng_metadata_begin(session); | |
3783 | ||
8cdc1a81 | 3784 | if (session->priv->metadata_dumped) |
c099397a | 3785 | goto skip_session; |
c099397a | 3786 | |
d793d5e1 | 3787 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3788 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3789 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3790 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3791 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3792 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3793 | |
3794 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3795 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3796 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3797 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3798 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3799 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3800 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3801 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3802 | "\n" |
3803 | "trace {\n" | |
3804 | " major = %u;\n" | |
3805 | " minor = %u;\n" | |
30bdb6e4 | 3806 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3807 | " byte_order = %s;\n" |
3808 | " packet.header := struct {\n" | |
3809 | " uint32_t magic;\n" | |
1ec3f75a | 3810 | " uint8_t uuid[16];\n" |
d793d5e1 | 3811 | " uint32_t stream_id;\n" |
5594698f | 3812 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3813 | " };\n" |
d793d5e1 | 3814 | "};\n\n", |
a90917c3 MD |
3815 | lttng_alignof(uint8_t) * CHAR_BIT, |
3816 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3817 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3818 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3819 | sizeof(unsigned long) * CHAR_BIT, |
3820 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3821 | CTF_SPEC_MAJOR, |
3822 | CTF_SPEC_MINOR, | |
d793d5e1 | 3823 | uuid_s, |
5214fa50 | 3824 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3825 | "be" |
3826 | #else | |
3827 | "le" | |
3828 | #endif | |
3829 | ); | |
3830 | if (ret) | |
3831 | goto end; | |
3832 | ||
99dc9597 MD |
3833 | ret = lttng_metadata_printf(session, |
3834 | "env {\n" | |
a6058143 | 3835 | " hostname = \"%s\";\n" |
c6c9e10f | 3836 | " domain = \"kernel\";\n" |
99dc9597 | 3837 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3838 | " kernel_release = \"%s\";\n" |
3839 | " kernel_version = \"%s\";\n" | |
3840 | " tracer_name = \"lttng-modules\";\n" | |
3841 | " tracer_major = %d;\n" | |
3842 | " tracer_minor = %d;\n" | |
3843 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3844 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3845 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3846 | utsname()->sysname, |
3847 | utsname()->release, | |
c6c9e10f MD |
3848 | utsname()->version, |
3849 | LTTNG_MODULES_MAJOR_VERSION, | |
3850 | LTTNG_MODULES_MINOR_VERSION, | |
3851 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3852 | ); |
3853 | if (ret) | |
3854 | goto end; | |
3855 | ||
8cdc1a81 | 3856 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3857 | if (ret) |
3858 | goto end; | |
3859 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3860 | session->priv->creation_time); |
3eb95be4 JR |
3861 | if (ret) |
3862 | goto end; | |
3863 | ||
c88f762e GB |
3864 | /* Add the product UUID to the 'env' section */ |
3865 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3866 | if (product_uuid) { | |
3867 | ret = lttng_metadata_printf(session, | |
3868 | " product_uuid = \"%s\";\n", | |
3869 | product_uuid | |
3870 | ); | |
3871 | if (ret) | |
3872 | goto end; | |
3873 | } | |
3874 | ||
3875 | /* Close the 'env' section */ | |
3eb95be4 JR |
3876 | ret = lttng_metadata_printf(session, "};\n\n"); |
3877 | if (ret) | |
3878 | goto end; | |
3879 | ||
a3ccff4f MD |
3880 | ret = lttng_metadata_printf(session, |
3881 | "clock {\n" | |
2754583e MD |
3882 | " name = \"%s\";\n", |
3883 | trace_clock_name() | |
a82c63f1 MD |
3884 | ); |
3885 | if (ret) | |
3886 | goto end; | |
3887 | ||
3888 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3889 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3890 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3891 | clock_uuid_s |
3892 | ); | |
3893 | if (ret) | |
3894 | goto end; | |
3895 | } | |
3896 | ||
3897 | ret = lttng_metadata_printf(session, | |
2754583e | 3898 | " description = \"%s\";\n" |
a3ccff4f MD |
3899 | " freq = %llu; /* Frequency, in Hz */\n" |
3900 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3901 | " offset = %lld;\n" |
a3ccff4f | 3902 | "};\n\n", |
2754583e | 3903 | trace_clock_description(), |
a3ccff4f | 3904 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3905 | (long long) measure_clock_offset() |
a3ccff4f MD |
3906 | ); |
3907 | if (ret) | |
3908 | goto end; | |
3909 | ||
3910 | ret = lttng_metadata_printf(session, | |
3911 | "typealias integer {\n" | |
3912 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3913 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3914 | "} := uint27_clock_monotonic_t;\n" |
3915 | "\n" | |
3916 | "typealias integer {\n" | |
3917 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3918 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3919 | "} := uint32_clock_monotonic_t;\n" |
3920 | "\n" | |
3921 | "typealias integer {\n" | |
3922 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3923 | " map = clock.%s.value;\n" |
a3ccff4f | 3924 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3925 | trace_clock_name(), |
a3ccff4f | 3926 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3927 | trace_clock_name(), |
3928 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3929 | trace_clock_name() | |
a3ccff4f MD |
3930 | ); |
3931 | if (ret) | |
3932 | goto end; | |
3933 | ||
a90917c3 | 3934 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3935 | if (ret) |
3936 | goto end; | |
3937 | ||
a90917c3 | 3938 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3939 | if (ret) |
3940 | goto end; | |
3941 | ||
c099397a | 3942 | skip_session: |
f7d06400 MD |
3943 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
3944 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
3945 | if (ret) |
3946 | goto end; | |
3947 | } | |
3948 | ||
f237aef8 | 3949 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 3950 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
3951 | if (ret) |
3952 | goto end; | |
3953 | } | |
8cdc1a81 | 3954 | session->priv->metadata_dumped = 1; |
c099397a | 3955 | end: |
8b97fd42 | 3956 | lttng_metadata_end(session); |
c099397a MD |
3957 | return ret; |
3958 | } | |
3959 | ||
c0e31d2e | 3960 | /** |
a90917c3 | 3961 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3962 | * @transport: transport structure |
3963 | * | |
3964 | * Registers a transport which can be used as output to extract the data out of | |
3965 | * LTTng. The module calling this registration function must ensure that no | |
3966 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3967 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3968 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3969 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3970 | * after its registration must it synchronize the TLBs. |
3971 | */ | |
a90917c3 | 3972 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3973 | { |
3974 | /* | |
3975 | * Make sure no page fault can be triggered by the module about to be | |
3976 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3977 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3978 | */ |
263b6c88 | 3979 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3980 | |
3981 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3982 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3983 | mutex_unlock(&sessions_mutex); |
3984 | } | |
a90917c3 | 3985 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3986 | |
3987 | /** | |
a90917c3 | 3988 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3989 | * @transport: transport structure |
3990 | */ | |
a90917c3 | 3991 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3992 | { |
3993 | mutex_lock(&sessions_mutex); | |
3994 | list_del(&transport->node); | |
3995 | mutex_unlock(&sessions_mutex); | |
3996 | } | |
a90917c3 | 3997 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3998 | |
a101fa10 MD |
3999 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4000 | { | |
4001 | /* | |
4002 | * Make sure no page fault can be triggered by the module about to be | |
4003 | * registered. We deal with this here so we don't have to call | |
4004 | * vmalloc_sync_mappings() in each module's init. | |
4005 | */ | |
4006 | wrapper_vmalloc_sync_mappings(); | |
4007 | ||
4008 | mutex_lock(&sessions_mutex); | |
4009 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4010 | mutex_unlock(&sessions_mutex); | |
4011 | } | |
4012 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4013 | ||
4014 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4015 | { | |
4016 | mutex_lock(&sessions_mutex); | |
4017 | list_del(&transport->node); | |
4018 | mutex_unlock(&sessions_mutex); | |
4019 | } | |
4020 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4021 | ||
5f4c791e | 4022 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4023 | |
4024 | enum cpuhp_state lttng_hp_prepare; | |
4025 | enum cpuhp_state lttng_hp_online; | |
4026 | ||
4027 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4028 | { | |
4029 | struct lttng_cpuhp_node *lttng_node; | |
4030 | ||
4031 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4032 | switch (lttng_node->component) { | |
4033 | case LTTNG_RING_BUFFER_FRONTEND: | |
4034 | return 0; | |
4035 | case LTTNG_RING_BUFFER_BACKEND: | |
4036 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4037 | case LTTNG_RING_BUFFER_ITER: | |
4038 | return 0; | |
4039 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4040 | return 0; | |
4041 | default: | |
4042 | return -EINVAL; | |
4043 | } | |
4044 | } | |
4045 | ||
4046 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4047 | { | |
4048 | struct lttng_cpuhp_node *lttng_node; | |
4049 | ||
4050 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4051 | switch (lttng_node->component) { | |
4052 | case LTTNG_RING_BUFFER_FRONTEND: | |
4053 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4054 | case LTTNG_RING_BUFFER_BACKEND: | |
4055 | return 0; | |
4056 | case LTTNG_RING_BUFFER_ITER: | |
4057 | return 0; | |
4058 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4059 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4060 | default: | |
4061 | return -EINVAL; | |
4062 | } | |
4063 | } | |
4064 | ||
4065 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4066 | { | |
4067 | struct lttng_cpuhp_node *lttng_node; | |
4068 | ||
4069 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4070 | switch (lttng_node->component) { | |
4071 | case LTTNG_RING_BUFFER_FRONTEND: | |
4072 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4073 | case LTTNG_RING_BUFFER_BACKEND: | |
4074 | return 0; | |
4075 | case LTTNG_RING_BUFFER_ITER: | |
4076 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4077 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4078 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4079 | default: | |
4080 | return -EINVAL; | |
4081 | } | |
4082 | } | |
4083 | ||
4084 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4085 | { | |
4086 | struct lttng_cpuhp_node *lttng_node; | |
4087 | ||
4088 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4089 | switch (lttng_node->component) { | |
4090 | case LTTNG_RING_BUFFER_FRONTEND: | |
4091 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4092 | case LTTNG_RING_BUFFER_BACKEND: | |
4093 | return 0; | |
4094 | case LTTNG_RING_BUFFER_ITER: | |
4095 | return 0; | |
4096 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4097 | return 0; | |
4098 | default: | |
4099 | return -EINVAL; | |
4100 | } | |
4101 | } | |
4102 | ||
4103 | static int __init lttng_init_cpu_hotplug(void) | |
4104 | { | |
4105 | int ret; | |
4106 | ||
4107 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4108 | lttng_hotplug_prepare, | |
4109 | lttng_hotplug_dead); | |
4110 | if (ret < 0) { | |
4111 | return ret; | |
4112 | } | |
4113 | lttng_hp_prepare = ret; | |
4114 | lttng_rb_set_hp_prepare(ret); | |
4115 | ||
4116 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4117 | lttng_hotplug_online, | |
4118 | lttng_hotplug_offline); | |
4119 | if (ret < 0) { | |
4120 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4121 | lttng_hp_prepare = 0; | |
4122 | return ret; | |
4123 | } | |
4124 | lttng_hp_online = ret; | |
4125 | lttng_rb_set_hp_online(ret); | |
4126 | ||
4127 | return 0; | |
4128 | } | |
4129 | ||
4130 | static void __exit lttng_exit_cpu_hotplug(void) | |
4131 | { | |
4132 | lttng_rb_set_hp_online(0); | |
4133 | cpuhp_remove_multi_state(lttng_hp_online); | |
4134 | lttng_rb_set_hp_prepare(0); | |
4135 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4136 | } | |
4137 | ||
5f4c791e | 4138 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4139 | static int lttng_init_cpu_hotplug(void) |
4140 | { | |
4141 | return 0; | |
4142 | } | |
4143 | static void lttng_exit_cpu_hotplug(void) | |
4144 | { | |
4145 | } | |
5f4c791e | 4146 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4147 | |
a90917c3 | 4148 | static int __init lttng_events_init(void) |
4e3c1b9b | 4149 | { |
1c25284c MD |
4150 | int ret; |
4151 | ||
389d7070 | 4152 | ret = wrapper_get_pfnblock_flags_mask_init(); |
114667d5 MD |
4153 | if (ret) |
4154 | return ret; | |
4155 | ret = lttng_probes_init(); | |
389d7070 MD |
4156 | if (ret) |
4157 | return ret; | |
07dfc1d0 | 4158 | ret = lttng_context_init(); |
20591cf7 MD |
4159 | if (ret) |
4160 | return ret; | |
07dfc1d0 MD |
4161 | ret = lttng_tracepoint_init(); |
4162 | if (ret) | |
4163 | goto error_tp; | |
a67ba386 MD |
4164 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4165 | if (!event_recorder_cache) { | |
20591cf7 | 4166 | ret = -ENOMEM; |
a67ba386 | 4167 | goto error_kmem_event_recorder; |
dffef45d | 4168 | } |
a67ba386 MD |
4169 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4170 | if (!event_recorder_private_cache) { | |
4171 | ret = -ENOMEM; | |
4172 | goto error_kmem_event_recorder_private; | |
4173 | } | |
4174 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4175 | if (!event_notifier_cache) { |
4176 | ret = -ENOMEM; | |
4177 | goto error_kmem_event_notifier; | |
20591cf7 | 4178 | } |
a67ba386 MD |
4179 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4180 | if (!event_notifier_private_cache) { | |
4181 | ret = -ENOMEM; | |
4182 | goto error_kmem_event_notifier_private; | |
4183 | } | |
80996790 | 4184 | ret = lttng_abi_init(); |
02119ee5 MD |
4185 | if (ret) |
4186 | goto error_abi; | |
0c956676 MD |
4187 | ret = lttng_logger_init(); |
4188 | if (ret) | |
4189 | goto error_logger; | |
1e367326 MD |
4190 | ret = lttng_init_cpu_hotplug(); |
4191 | if (ret) | |
4192 | goto error_hotplug; | |
101215b7 | 4193 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4194 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4195 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4196 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4197 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4198 | LTTNG_VERSION_NAME, |
4199 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4200 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4201 | #else | |
4202 | "", | |
4203 | #endif | |
4204 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4205 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4206 | #else | |
4207 | ""); | |
4208 | #endif | |
c1551e57 MJ |
4209 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4210 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4211 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4212 | return 0; |
0c956676 | 4213 | |
1e367326 MD |
4214 | error_hotplug: |
4215 | lttng_logger_exit(); | |
0c956676 MD |
4216 | error_logger: |
4217 | lttng_abi_exit(); | |
02119ee5 | 4218 | error_abi: |
a67ba386 MD |
4219 | kmem_cache_destroy(event_notifier_private_cache); |
4220 | error_kmem_event_notifier_private: | |
dffef45d FD |
4221 | kmem_cache_destroy(event_notifier_cache); |
4222 | error_kmem_event_notifier: | |
a67ba386 MD |
4223 | kmem_cache_destroy(event_recorder_private_cache); |
4224 | error_kmem_event_recorder_private: | |
4225 | kmem_cache_destroy(event_recorder_cache); | |
4226 | error_kmem_event_recorder: | |
20591cf7 | 4227 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4228 | error_tp: |
4229 | lttng_context_exit(); | |
101215b7 | 4230 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4231 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4232 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4233 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4234 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4235 | LTTNG_VERSION_NAME, |
4236 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4237 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4238 | #else | |
4239 | "", | |
4240 | #endif | |
4241 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4242 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4243 | #else | |
4244 | ""); | |
4245 | #endif | |
1c25284c | 4246 | return ret; |
4e3c1b9b MD |
4247 | } |
4248 | ||
a90917c3 | 4249 | module_init(lttng_events_init); |
11b5a3c2 | 4250 | |
a90917c3 | 4251 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4252 | { |
8cdc1a81 | 4253 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4254 | |
1e367326 | 4255 | lttng_exit_cpu_hotplug(); |
0c956676 | 4256 | lttng_logger_exit(); |
80996790 | 4257 | lttng_abi_exit(); |
8cdc1a81 MD |
4258 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4259 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4260 | kmem_cache_destroy(event_recorder_cache); |
4261 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4262 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4263 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4264 | lttng_tracepoint_exit(); |
07dfc1d0 | 4265 | lttng_context_exit(); |
101215b7 | 4266 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4267 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4268 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4269 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4270 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4271 | LTTNG_VERSION_NAME, |
4272 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4273 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4274 | #else | |
4275 | "", | |
4276 | #endif | |
4277 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4278 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4279 | #else | |
4280 | ""); | |
4281 | #endif | |
4e3c1b9b | 4282 | } |
92e94819 | 4283 | |
a90917c3 | 4284 | module_exit(lttng_events_exit); |
11b5a3c2 | 4285 | |
7ca11e77 | 4286 | #include <generated/patches.h> |
101215b7 MJ |
4287 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4288 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4289 | #endif | |
4290 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4291 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4292 | #endif | |
92e94819 MD |
4293 | MODULE_LICENSE("GPL and additional rights"); |
4294 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4295 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4296 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4297 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4298 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4299 | LTTNG_MODULES_EXTRAVERSION); |