Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
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> |
710e9669 | 37 | #include <wrapper/barrier.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.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> | |
710e9669 | 49 | #include <counter/counter.h> |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b MD |
61 | static DEFINE_MUTEX(sessions_mutex); |
62 | static struct kmem_cache *event_cache; | |
dffef45d | 63 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 64 | |
b2bc0bc8 FD |
65 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
66 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
67 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 68 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 69 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 70 | |
a90917c3 | 71 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 72 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
710e9669 MD |
73 | static void _lttng_channel_destroy(struct lttng_channel *channel); |
74 | static void _lttng_session_counter_destroy(struct lttng_counter *counter); | |
a90917c3 | 75 | static int _lttng_event_unregister(struct lttng_event *event); |
dffef45d | 76 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 77 | static |
a90917c3 | 78 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
a90917c3 | 79 | struct lttng_event *event); |
c099397a | 80 | static |
a90917c3 | 81 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
ceabb767 MD |
85 | int _lttng_type_statedump(struct lttng_session *session, |
86 | const struct lttng_type *type, | |
87 | size_t nesting); | |
88 | static | |
f513b2bf MD |
89 | int _lttng_field_statedump(struct lttng_session *session, |
90 | const struct lttng_event_field *field, | |
91 | size_t nesting); | |
c099397a | 92 | |
710e9669 MD |
93 | static bool lttng_event_container_is_metadata_channel(struct lttng_event_container *container) |
94 | { | |
95 | switch (container->type) { | |
96 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
97 | { | |
98 | struct lttng_channel *chan = lttng_event_container_get_channel(container); | |
99 | ||
100 | return chan->channel_type == METADATA_CHANNEL; | |
101 | } | |
102 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
103 | return false; | |
104 | default: | |
105 | return false; | |
106 | } | |
107 | } | |
108 | ||
109 | static bool lttng_event_within_metadata_channel(struct lttng_event *event) | |
110 | { | |
111 | return lttng_event_container_is_metadata_channel(event->container); | |
112 | } | |
113 | ||
c099397a | 114 | void synchronize_trace(void) |
abcca994 | 115 | { |
5f4c791e | 116 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
117 | synchronize_rcu(); |
118 | #else | |
abcca994 | 119 | synchronize_sched(); |
92da05ce MJ |
120 | #endif |
121 | ||
5f4c791e | 122 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
123 | #ifdef CONFIG_PREEMPT_RT_FULL |
124 | synchronize_rcu(); | |
125 | #endif | |
5f4c791e | 126 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
127 | #ifdef CONFIG_PREEMPT_RT |
128 | synchronize_rcu(); | |
129 | #endif | |
5f4c791e | 130 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
131 | } |
132 | ||
3c997079 MD |
133 | void lttng_lock_sessions(void) |
134 | { | |
135 | mutex_lock(&sessions_mutex); | |
136 | } | |
137 | ||
138 | void lttng_unlock_sessions(void) | |
139 | { | |
140 | mutex_unlock(&sessions_mutex); | |
141 | } | |
142 | ||
9fe593d2 FD |
143 | static struct lttng_transport *lttng_transport_find(const char *name) |
144 | { | |
145 | struct lttng_transport *transport; | |
146 | ||
147 | list_for_each_entry(transport, <tng_transport_list, node) { | |
148 | if (!strcmp(transport->name, name)) | |
149 | return transport; | |
150 | } | |
151 | return NULL; | |
152 | } | |
153 | ||
3c997079 MD |
154 | /* |
155 | * Called with sessions lock held. | |
156 | */ | |
157 | int lttng_session_active(void) | |
158 | { | |
159 | struct lttng_session *iter; | |
160 | ||
161 | list_for_each_entry(iter, &sessions, list) { | |
162 | if (iter->active) | |
163 | return 1; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
a90917c3 | 168 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 169 | { |
a90917c3 | 170 | struct lttng_session *session; |
d83004aa | 171 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 172 | int i; |
4e3c1b9b MD |
173 | |
174 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 175 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 176 | if (!session) |
d83004aa | 177 | goto err; |
4e3c1b9b | 178 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 179 | INIT_LIST_HEAD(&session->events); |
710e9669 | 180 | INIT_LIST_HEAD(&session->counters); |
a7008254 | 181 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
182 | |
183 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
184 | GFP_KERNEL); | |
185 | if (!metadata_cache) | |
186 | goto err_free_session; | |
0ca42eb7 | 187 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
188 | if (!metadata_cache->data) |
189 | goto err_free_cache; | |
190 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
191 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 192 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
193 | session->metadata_cache = metadata_cache; |
194 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
195 | memcpy(&metadata_cache->uuid, &session->uuid, |
196 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
197 | INIT_LIST_HEAD(&session->enablers_head); |
198 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
710e9669 MD |
199 | INIT_HLIST_HEAD(&session->events_name_ht.table[i]); |
200 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
201 | INIT_HLIST_HEAD(&session->events_key_ht.table[i]); | |
4e3c1b9b | 202 | list_add(&session->list, &sessions); |
d1f652f8 MD |
203 | session->pid_tracker.session = session; |
204 | session->pid_tracker.tracker_type = TRACKER_PID; | |
205 | session->vpid_tracker.session = session; | |
206 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
207 | session->uid_tracker.session = session; | |
208 | session->uid_tracker.tracker_type = TRACKER_UID; | |
209 | session->vuid_tracker.session = session; | |
210 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
211 | session->gid_tracker.session = session; | |
212 | session->gid_tracker.tracker_type = TRACKER_GID; | |
213 | session->vgid_tracker.session = session; | |
214 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
215 | mutex_unlock(&sessions_mutex); |
216 | return session; | |
d83004aa JD |
217 | |
218 | err_free_cache: | |
219 | kfree(metadata_cache); | |
220 | err_free_session: | |
48f5e0b5 | 221 | lttng_kvfree(session); |
d83004aa JD |
222 | err: |
223 | mutex_unlock(&sessions_mutex); | |
224 | return NULL; | |
225 | } | |
226 | ||
99f52fcc FD |
227 | static |
228 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
229 | { | |
230 | struct lttng_counter_transport *transport; | |
231 | ||
232 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
233 | if (!strcmp(transport->name, name)) | |
234 | return transport; | |
235 | } | |
236 | return NULL; | |
237 | } | |
238 | ||
710e9669 | 239 | static |
99f52fcc FD |
240 | struct lttng_counter *lttng_kernel_counter_create( |
241 | const char *counter_transport_name, | |
710e9669 MD |
242 | size_t number_dimensions, const size_t *dimensions_sizes, |
243 | bool coalesce_hits) | |
99f52fcc | 244 | { |
99f52fcc | 245 | struct lttng_counter_transport *counter_transport = NULL; |
710e9669 MD |
246 | struct lttng_counter *counter = NULL; |
247 | struct lttng_event_container *container; | |
99f52fcc FD |
248 | |
249 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
250 | if (!counter_transport) { | |
251 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
252 | counter_transport_name); | |
253 | goto notransport; | |
254 | } | |
255 | if (!try_module_get(counter_transport->owner)) { | |
256 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
257 | goto notransport; | |
258 | } | |
259 | ||
260 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
261 | if (!counter) | |
262 | goto nomem; | |
710e9669 MD |
263 | container = lttng_counter_get_event_container(counter); |
264 | container->type = LTTNG_EVENT_CONTAINER_COUNTER; | |
265 | container->coalesce_hits = coalesce_hits; | |
99f52fcc FD |
266 | /* Create event notifier error counter. */ |
267 | counter->ops = &counter_transport->ops; | |
268 | counter->transport = counter_transport; | |
710e9669 | 269 | mutex_init(&counter->map.lock); |
99f52fcc FD |
270 | |
271 | counter->counter = counter->ops->counter_create( | |
272 | number_dimensions, dimensions_sizes, 0); | |
273 | if (!counter->counter) { | |
710e9669 | 274 | printk(KERN_WARNING "LTTng: Error creating counter"); |
99f52fcc FD |
275 | goto create_error; |
276 | } | |
277 | ||
278 | return counter; | |
279 | ||
280 | create_error: | |
281 | lttng_kvfree(counter); | |
282 | nomem: | |
283 | if (counter_transport) | |
284 | module_put(counter_transport->owner); | |
285 | notransport: | |
286 | return NULL; | |
287 | } | |
288 | ||
710e9669 MD |
289 | static |
290 | void lttng_kernel_counter_destroy(struct lttng_counter *counter) | |
291 | { | |
292 | counter->ops->counter_destroy(counter->counter); | |
293 | module_put(counter->transport->owner); | |
294 | lttng_kvfree(counter->map.descriptors); | |
295 | lttng_kvfree(counter); | |
296 | } | |
297 | ||
298 | int lttng_event_notifier_group_set_error_counter( | |
299 | struct lttng_event_notifier_group *event_notifier_group, | |
300 | const char *counter_transport_name, | |
301 | size_t counter_len) | |
302 | { | |
303 | struct lttng_counter *counter; | |
304 | int ret; | |
305 | ||
306 | /* | |
307 | * Lock sessions to provide mutual exclusion against concurrent | |
308 | * modification of trigger group, which would result in | |
309 | * overwriting the error counter if set concurrently. | |
310 | */ | |
311 | mutex_lock(&sessions_mutex); | |
312 | ||
313 | if (event_notifier_group->error_counter) { | |
314 | printk(KERN_ERR "Error counter already set in event notifier group\n"); | |
315 | ret = -EBUSY; | |
316 | goto error; | |
317 | } | |
318 | ||
319 | counter = lttng_kernel_counter_create(counter_transport_name, | |
320 | 1, &counter_len, false); | |
321 | if (!counter) { | |
322 | ret = -EINVAL; | |
323 | goto error; | |
324 | } | |
325 | ||
326 | event_notifier_group->error_counter_len = counter_len; | |
327 | /* | |
328 | * store-release to publish error counter matches load-acquire | |
329 | * in record_error. Ensures the counter is created and the | |
330 | * error_counter_len is set before they are used. | |
331 | */ | |
332 | lttng_smp_store_release(&event_notifier_group->error_counter, | |
333 | counter); | |
334 | ||
335 | mutex_unlock(&sessions_mutex); | |
336 | return 0; | |
337 | ||
338 | error: | |
339 | mutex_unlock(&sessions_mutex); | |
340 | return ret; | |
341 | } | |
342 | ||
750b05f2 FD |
343 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
344 | { | |
345 | struct lttng_transport *transport = NULL; | |
346 | struct lttng_event_notifier_group *event_notifier_group; | |
347 | const char *transport_name = "relay-event-notifier"; | |
348 | size_t subbuf_size = 4096; //TODO | |
349 | size_t num_subbuf = 16; //TODO | |
350 | unsigned int switch_timer_interval = 0; | |
351 | unsigned int read_timer_interval = 0; | |
dffef45d | 352 | int i; |
750b05f2 FD |
353 | |
354 | mutex_lock(&sessions_mutex); | |
355 | ||
356 | transport = lttng_transport_find(transport_name); | |
357 | if (!transport) { | |
358 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
359 | transport_name); | |
360 | goto notransport; | |
361 | } | |
362 | if (!try_module_get(transport->owner)) { | |
363 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
364 | transport_name); | |
365 | goto notransport; | |
366 | } | |
367 | ||
368 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
369 | GFP_KERNEL); | |
370 | if (!event_notifier_group) | |
371 | goto nomem; | |
372 | ||
373 | /* | |
374 | * Initialize the ring buffer used to store event notifier | |
375 | * notifications. | |
376 | */ | |
377 | event_notifier_group->ops = &transport->ops; | |
378 | event_notifier_group->chan = transport->ops.channel_create( | |
379 | transport_name, event_notifier_group, NULL, | |
380 | subbuf_size, num_subbuf, switch_timer_interval, | |
381 | read_timer_interval); | |
382 | if (!event_notifier_group->chan) | |
383 | goto create_error; | |
384 | ||
385 | event_notifier_group->transport = transport; | |
dffef45d FD |
386 | |
387 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
388 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
389 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
390 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
391 | ||
750b05f2 FD |
392 | list_add(&event_notifier_group->node, &event_notifier_groups); |
393 | ||
394 | mutex_unlock(&sessions_mutex); | |
395 | ||
396 | return event_notifier_group; | |
397 | ||
398 | create_error: | |
399 | lttng_kvfree(event_notifier_group); | |
400 | nomem: | |
401 | if (transport) | |
402 | module_put(transport->owner); | |
403 | notransport: | |
404 | mutex_unlock(&sessions_mutex); | |
405 | return NULL; | |
406 | } | |
407 | ||
710e9669 MD |
408 | struct lttng_counter *lttng_session_create_counter( |
409 | struct lttng_session *session, | |
410 | const char *counter_transport_name, | |
411 | size_t number_dimensions, const size_t *dimensions_sizes, | |
412 | bool coalesce_hits) | |
413 | { | |
414 | struct lttng_counter *counter; | |
415 | struct lttng_event_container *container; | |
416 | ||
417 | counter = lttng_kernel_counter_create(counter_transport_name, | |
418 | number_dimensions, dimensions_sizes, | |
419 | coalesce_hits); | |
420 | if (!counter) { | |
421 | goto counter_error; | |
422 | } | |
423 | container = lttng_counter_get_event_container(counter); | |
424 | ||
425 | mutex_lock(&sessions_mutex); | |
426 | container->session = session; | |
427 | list_add(&counter->node, &session->counters); | |
428 | mutex_unlock(&sessions_mutex); | |
429 | ||
430 | return counter; | |
431 | ||
432 | counter_error: | |
433 | return NULL; | |
434 | } | |
435 | ||
d83004aa JD |
436 | void metadata_cache_destroy(struct kref *kref) |
437 | { | |
438 | struct lttng_metadata_cache *cache = | |
439 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 440 | vfree(cache->data); |
d83004aa | 441 | kfree(cache); |
4e3c1b9b MD |
442 | } |
443 | ||
a90917c3 | 444 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 445 | { |
a90917c3 MD |
446 | struct lttng_channel *chan, *tmpchan; |
447 | struct lttng_event *event, *tmpevent; | |
d83004aa | 448 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 449 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
710e9669 | 450 | struct lttng_counter *counter, *tmpcounter; |
dda6a249 | 451 | int ret; |
4e3c1b9b MD |
452 | |
453 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 454 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 455 | list_for_each_entry(chan, &session->chan, list) { |
710e9669 MD |
456 | ret = lttng_syscalls_unregister_event_container(lttng_channel_get_event_container(chan)); |
457 | WARN_ON(ret); | |
458 | } | |
459 | list_for_each_entry(counter, &session->counters, node) { | |
460 | ret = lttng_syscalls_unregister_event_container(lttng_counter_get_event_container(counter)); | |
1ec65de1 MD |
461 | WARN_ON(ret); |
462 | } | |
dda6a249 | 463 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 464 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
465 | WARN_ON(ret); |
466 | } | |
abcca994 | 467 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 468 | list_for_each_entry(chan, &session->chan, list) { |
710e9669 MD |
469 | ret = lttng_syscalls_destroy_event_container(lttng_channel_get_event_container(chan)); |
470 | WARN_ON(ret); | |
471 | } | |
472 | list_for_each_entry(counter, &session->counters, node) { | |
473 | ret = lttng_syscalls_destroy_event_container(lttng_counter_get_event_container(counter)); | |
badfe9f5 MD |
474 | WARN_ON(ret); |
475 | } | |
b2bc0bc8 | 476 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 477 | &session->enablers_head, node) |
b2bc0bc8 | 478 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 479 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 480 | _lttng_event_destroy(event); |
d83004aa JD |
481 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
482 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 483 | _lttng_channel_destroy(chan); |
d83004aa | 484 | } |
710e9669 MD |
485 | list_for_each_entry_safe(counter, tmpcounter, &session->counters, node) |
486 | _lttng_session_counter_destroy(counter); | |
ab036a63 | 487 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
488 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
489 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 490 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
491 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
492 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
493 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
494 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
495 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
496 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 497 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
498 | list_del(&session->list); |
499 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 500 | lttng_kvfree(session); |
4e3c1b9b MD |
501 | } |
502 | ||
dffef45d FD |
503 | void lttng_event_notifier_group_destroy( |
504 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 505 | { |
dffef45d FD |
506 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
507 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
508 | int ret; | |
509 | ||
750b05f2 FD |
510 | if (!event_notifier_group) |
511 | return; | |
512 | ||
513 | mutex_lock(&sessions_mutex); | |
dffef45d | 514 | |
3b82c4e1 | 515 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
516 | WARN_ON(ret); |
517 | ||
dffef45d FD |
518 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
519 | &event_notifier_group->event_notifiers_head, list) { | |
520 | ret = _lttng_event_notifier_unregister(event_notifier); | |
521 | WARN_ON(ret); | |
522 | } | |
523 | ||
b01155ba FD |
524 | /* Wait for in-flight event notifier to complete */ |
525 | synchronize_trace(); | |
526 | ||
21f58fb7 FD |
527 | irq_work_sync(&event_notifier_group->wakeup_pending); |
528 | ||
8a8ac9a8 FD |
529 | kfree(event_notifier_group->sc_filter); |
530 | ||
dffef45d FD |
531 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
532 | &event_notifier_group->enablers_head, node) | |
533 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
534 | ||
535 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
536 | &event_notifier_group->event_notifiers_head, list) | |
537 | _lttng_event_notifier_destroy(event_notifier); | |
538 | ||
99f52fcc FD |
539 | if (event_notifier_group->error_counter) { |
540 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 541 | |
710e9669 | 542 | lttng_kernel_counter_destroy(error_counter); |
99f52fcc FD |
543 | event_notifier_group->error_counter = NULL; |
544 | } | |
545 | ||
750b05f2 FD |
546 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
547 | module_put(event_notifier_group->transport->owner); | |
548 | list_del(&event_notifier_group->node); | |
dffef45d | 549 | |
750b05f2 FD |
550 | mutex_unlock(&sessions_mutex); |
551 | lttng_kvfree(event_notifier_group); | |
552 | } | |
553 | ||
601252cf MD |
554 | int lttng_session_statedump(struct lttng_session *session) |
555 | { | |
556 | int ret; | |
557 | ||
558 | mutex_lock(&sessions_mutex); | |
559 | ret = lttng_statedump_start(session); | |
560 | mutex_unlock(&sessions_mutex); | |
561 | return ret; | |
562 | } | |
563 | ||
a90917c3 | 564 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
565 | { |
566 | int ret = 0; | |
a90917c3 | 567 | struct lttng_channel *chan; |
c0e31d2e MD |
568 | |
569 | mutex_lock(&sessions_mutex); | |
570 | if (session->active) { | |
571 | ret = -EBUSY; | |
572 | goto end; | |
573 | } | |
c099397a | 574 | |
3c997079 MD |
575 | /* Set transient enabler state to "enabled" */ |
576 | session->tstate = 1; | |
577 | ||
4ef81e4a | 578 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 579 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 580 | |
c099397a MD |
581 | /* |
582 | * Snapshot the number of events per channel to know the type of header | |
583 | * we need to use. | |
584 | */ | |
585 | list_for_each_entry(chan, &session->chan, list) { | |
586 | if (chan->header_type) | |
587 | continue; /* don't change it if session stop/restart */ | |
588 | if (chan->free_event_id < 31) | |
589 | chan->header_type = 1; /* compact */ | |
590 | else | |
591 | chan->header_type = 2; /* large */ | |
592 | } | |
593 | ||
64af2437 | 594 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
595 | list_for_each_entry(chan, &session->chan, list) { |
596 | if (chan->channel_type != METADATA_CHANNEL) | |
597 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
598 | } | |
64af2437 | 599 | |
a8f2d0c7 MJ |
600 | WRITE_ONCE(session->active, 1); |
601 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 602 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 603 | if (ret) { |
a8f2d0c7 | 604 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
605 | goto end; |
606 | } | |
607 | ret = lttng_statedump_start(session); | |
360f38ea | 608 | if (ret) |
a8f2d0c7 | 609 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
610 | end: |
611 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 612 | return ret; |
c0e31d2e MD |
613 | } |
614 | ||
a90917c3 | 615 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
616 | { |
617 | int ret = 0; | |
64af2437 | 618 | struct lttng_channel *chan; |
c0e31d2e MD |
619 | |
620 | mutex_lock(&sessions_mutex); | |
621 | if (!session->active) { | |
622 | ret = -EBUSY; | |
623 | goto end; | |
624 | } | |
a8f2d0c7 | 625 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
626 | |
627 | /* Set transient enabler state to "disabled" */ | |
628 | session->tstate = 0; | |
b2bc0bc8 | 629 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
630 | |
631 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
632 | list_for_each_entry(chan, &session->chan, list) { |
633 | if (chan->channel_type != METADATA_CHANNEL) | |
634 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
635 | } | |
c0e31d2e MD |
636 | end: |
637 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 638 | return ret; |
c0e31d2e MD |
639 | } |
640 | ||
9616f0bf JD |
641 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
642 | { | |
643 | int ret = 0; | |
644 | struct lttng_channel *chan; | |
645 | struct lttng_event *event; | |
646 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
647 | struct lttng_metadata_stream *stream; | |
648 | ||
649 | mutex_lock(&sessions_mutex); | |
650 | if (!session->active) { | |
651 | ret = -EBUSY; | |
652 | goto end; | |
653 | } | |
654 | ||
655 | mutex_lock(&cache->lock); | |
656 | memset(cache->data, 0, cache->cache_alloc); | |
657 | cache->metadata_written = 0; | |
658 | cache->version++; | |
659 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
660 | stream->metadata_out = 0; | |
661 | stream->metadata_in = 0; | |
662 | } | |
663 | mutex_unlock(&cache->lock); | |
664 | ||
665 | session->metadata_dumped = 0; | |
666 | list_for_each_entry(chan, &session->chan, list) { | |
667 | chan->metadata_dumped = 0; | |
668 | } | |
669 | ||
670 | list_for_each_entry(event, &session->events, list) { | |
671 | event->metadata_dumped = 0; | |
672 | } | |
673 | ||
674 | ret = _lttng_session_metadata_statedump(session); | |
675 | ||
676 | end: | |
677 | mutex_unlock(&sessions_mutex); | |
678 | return ret; | |
679 | } | |
680 | ||
710e9669 | 681 | int lttng_event_container_enable(struct lttng_event_container *container) |
e64957da | 682 | { |
3c997079 | 683 | int ret = 0; |
e64957da | 684 | |
3c997079 | 685 | mutex_lock(&sessions_mutex); |
710e9669 | 686 | if (lttng_event_container_is_metadata_channel(container)) { |
3c997079 MD |
687 | ret = -EPERM; |
688 | goto end; | |
689 | } | |
710e9669 | 690 | if (container->enabled) { |
3c997079 MD |
691 | ret = -EEXIST; |
692 | goto end; | |
693 | } | |
694 | /* Set transient enabler state to "enabled" */ | |
710e9669 MD |
695 | container->tstate = 1; |
696 | lttng_session_sync_event_enablers(container->session); | |
3c997079 | 697 | /* Set atomically the state to "enabled" */ |
710e9669 | 698 | WRITE_ONCE(container->enabled, 1); |
3c997079 MD |
699 | end: |
700 | mutex_unlock(&sessions_mutex); | |
701 | return ret; | |
e64957da MD |
702 | } |
703 | ||
710e9669 | 704 | int lttng_event_container_disable(struct lttng_event_container *container) |
e64957da | 705 | { |
3c997079 | 706 | int ret = 0; |
e64957da | 707 | |
3c997079 | 708 | mutex_lock(&sessions_mutex); |
710e9669 | 709 | if (lttng_event_container_is_metadata_channel(container)) { |
3c997079 MD |
710 | ret = -EPERM; |
711 | goto end; | |
712 | } | |
710e9669 | 713 | if (!container->enabled) { |
3c997079 MD |
714 | ret = -EEXIST; |
715 | goto end; | |
716 | } | |
717 | /* Set atomically the state to "disabled" */ | |
710e9669 | 718 | WRITE_ONCE(container->enabled, 0); |
3c997079 | 719 | /* Set transient enabler state to "enabled" */ |
710e9669 MD |
720 | container->tstate = 0; |
721 | lttng_session_sync_event_enablers(container->session); | |
3c997079 MD |
722 | end: |
723 | mutex_unlock(&sessions_mutex); | |
724 | return ret; | |
e64957da MD |
725 | } |
726 | ||
a90917c3 | 727 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 728 | { |
3c997079 | 729 | int ret = 0; |
e64957da | 730 | |
3c997079 | 731 | mutex_lock(&sessions_mutex); |
710e9669 | 732 | if (lttng_event_within_metadata_channel(event)) { |
3c997079 MD |
733 | ret = -EPERM; |
734 | goto end; | |
735 | } | |
736 | if (event->enabled) { | |
737 | ret = -EEXIST; | |
738 | goto end; | |
739 | } | |
a0493bef MD |
740 | switch (event->instrumentation) { |
741 | case LTTNG_KERNEL_TRACEPOINT: | |
742 | case LTTNG_KERNEL_SYSCALL: | |
743 | ret = -EINVAL; | |
744 | break; | |
745 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 746 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 747 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 748 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
749 | break; |
750 | case LTTNG_KERNEL_KRETPROBE: | |
751 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
752 | break; | |
e884017c | 753 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
754 | default: |
755 | WARN_ON_ONCE(1); | |
756 | ret = -EINVAL; | |
757 | } | |
3c997079 MD |
758 | end: |
759 | mutex_unlock(&sessions_mutex); | |
760 | return ret; | |
e64957da MD |
761 | } |
762 | ||
a90917c3 | 763 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 764 | { |
3c997079 | 765 | int ret = 0; |
e64957da | 766 | |
3c997079 | 767 | mutex_lock(&sessions_mutex); |
710e9669 | 768 | if (lttng_event_within_metadata_channel(event)) { |
3c997079 MD |
769 | ret = -EPERM; |
770 | goto end; | |
771 | } | |
772 | if (!event->enabled) { | |
773 | ret = -EEXIST; | |
774 | goto end; | |
775 | } | |
a0493bef MD |
776 | switch (event->instrumentation) { |
777 | case LTTNG_KERNEL_TRACEPOINT: | |
778 | case LTTNG_KERNEL_SYSCALL: | |
779 | ret = -EINVAL; | |
780 | break; | |
781 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 782 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 783 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 784 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
785 | break; |
786 | case LTTNG_KERNEL_KRETPROBE: | |
787 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
788 | break; | |
e884017c | 789 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
790 | default: |
791 | WARN_ON_ONCE(1); | |
792 | ret = -EINVAL; | |
793 | } | |
3c997079 MD |
794 | end: |
795 | mutex_unlock(&sessions_mutex); | |
796 | return ret; | |
e64957da MD |
797 | } |
798 | ||
dffef45d FD |
799 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
800 | { | |
801 | int ret = 0; | |
802 | ||
803 | mutex_lock(&sessions_mutex); | |
804 | if (event_notifier->enabled) { | |
805 | ret = -EEXIST; | |
806 | goto end; | |
807 | } | |
808 | switch (event_notifier->instrumentation) { | |
809 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 810 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
811 | ret = -EINVAL; |
812 | break; | |
dffef45d | 813 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 814 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
815 | WRITE_ONCE(event_notifier->enabled, 1); |
816 | break; | |
dffef45d | 817 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
818 | case LTTNG_KERNEL_NOOP: |
819 | case LTTNG_KERNEL_KRETPROBE: | |
820 | default: | |
821 | WARN_ON_ONCE(1); | |
822 | ret = -EINVAL; | |
823 | } | |
824 | end: | |
825 | mutex_unlock(&sessions_mutex); | |
826 | return ret; | |
827 | } | |
828 | ||
829 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
830 | { | |
831 | int ret = 0; | |
832 | ||
833 | mutex_lock(&sessions_mutex); | |
834 | if (!event_notifier->enabled) { | |
835 | ret = -EEXIST; | |
836 | goto end; | |
837 | } | |
838 | switch (event_notifier->instrumentation) { | |
839 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 840 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
841 | ret = -EINVAL; |
842 | break; | |
dffef45d | 843 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 844 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
845 | WRITE_ONCE(event_notifier->enabled, 0); |
846 | break; | |
dffef45d | 847 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
848 | case LTTNG_KERNEL_NOOP: |
849 | case LTTNG_KERNEL_KRETPROBE: | |
850 | default: | |
851 | WARN_ON_ONCE(1); | |
852 | ret = -EINVAL; | |
853 | } | |
854 | end: | |
855 | mutex_unlock(&sessions_mutex); | |
856 | return ret; | |
857 | } | |
858 | ||
a90917c3 | 859 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
860 | const char *transport_name, |
861 | void *buf_addr, | |
4e3c1b9b MD |
862 | size_t subbuf_size, size_t num_subbuf, |
863 | unsigned int switch_timer_interval, | |
d83004aa JD |
864 | unsigned int read_timer_interval, |
865 | enum channel_type channel_type) | |
4e3c1b9b | 866 | { |
710e9669 MD |
867 | struct lttng_event_container *container; |
868 | struct lttng_channel *chan = NULL; | |
a90917c3 | 869 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
870 | |
871 | mutex_lock(&sessions_mutex); | |
d83004aa | 872 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 873 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 874 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 875 | if (!transport) { |
5a15f70c | 876 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 877 | transport_name); |
c0e31d2e | 878 | goto notransport; |
f3d01b96 | 879 | } |
a33c9927 | 880 | if (!try_module_get(transport->owner)) { |
5a15f70c | 881 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
882 | goto notransport; |
883 | } | |
710e9669 | 884 | chan = lttng_kvzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 885 | if (!chan) |
c0e31d2e | 886 | goto nomem; |
710e9669 MD |
887 | container = lttng_channel_get_event_container(chan); |
888 | container->type = LTTNG_EVENT_CONTAINER_CHANNEL; | |
889 | container->session = session; | |
890 | container->tstate = 1; | |
891 | container->enabled = 1; | |
892 | /* | |
893 | * The ring buffer always coalesces hits from various event | |
894 | * enablers matching a given event to a single event record within the | |
895 | * ring buffer. | |
896 | */ | |
897 | container->coalesce_hits = true; | |
898 | ||
05d32c64 | 899 | chan->id = session->free_chan_id++; |
3b731ab1 | 900 | chan->ops = &transport->ops; |
125b4df4 MD |
901 | /* |
902 | * Note: the channel creation op already writes into the packet | |
903 | * headers. Therefore the "chan" information used as input | |
904 | * should be already accessible. | |
905 | */ | |
5f5ddf01 | 906 | chan->chan = transport->ops.channel_create(transport_name, |
710e9669 | 907 | container, buf_addr, subbuf_size, num_subbuf, |
5f5ddf01 | 908 | switch_timer_interval, read_timer_interval); |
f3d01b96 MD |
909 | if (!chan->chan) |
910 | goto create_error; | |
a33c9927 | 911 | chan->transport = transport; |
d83004aa | 912 | chan->channel_type = channel_type; |
4e3c1b9b MD |
913 | list_add(&chan->list, &session->chan); |
914 | mutex_unlock(&sessions_mutex); | |
915 | return chan; | |
916 | ||
f3d01b96 | 917 | create_error: |
710e9669 | 918 | lttng_kvfree(chan); |
c0e31d2e | 919 | nomem: |
a33c9927 MD |
920 | if (transport) |
921 | module_put(transport->owner); | |
c0e31d2e | 922 | notransport: |
e5382b6d | 923 | active: |
4e3c1b9b MD |
924 | mutex_unlock(&sessions_mutex); |
925 | return NULL; | |
926 | } | |
927 | ||
710e9669 MD |
928 | static |
929 | void _lttng_session_counter_destroy(struct lttng_counter *counter) | |
930 | { | |
931 | list_del(&counter->node); | |
932 | lttng_kernel_counter_destroy(counter); | |
933 | } | |
934 | ||
4e3c1b9b | 935 | /* |
d83004aa JD |
936 | * Only used internally at session destruction for per-cpu channels, and |
937 | * when metadata channel is released. | |
938 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 939 | */ |
aa7c23a9 | 940 | static |
a90917c3 | 941 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 942 | { |
11b5a3c2 | 943 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 944 | module_put(chan->transport->owner); |
4e3c1b9b | 945 | list_del(&chan->list); |
8070f5c0 | 946 | lttng_destroy_context(chan->ctx); |
710e9669 | 947 | lttng_kvfree(chan); |
4e3c1b9b MD |
948 | } |
949 | ||
d83004aa JD |
950 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
951 | { | |
952 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
d83004aa JD |
953 | /* Protect the metadata cache with the sessions_mutex. */ |
954 | mutex_lock(&sessions_mutex); | |
955 | _lttng_channel_destroy(chan); | |
956 | mutex_unlock(&sessions_mutex); | |
957 | } | |
958 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
959 | ||
960 | static | |
961 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
962 | { | |
963 | stream->finalized = 1; | |
964 | wake_up_interruptible(&stream->read_wait); | |
965 | } | |
966 | ||
710e9669 MD |
967 | static |
968 | bool lttng_event_container_current_id_full(struct lttng_event_container *container) | |
969 | { | |
970 | switch (container->type) { | |
971 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
972 | { | |
973 | struct lttng_channel *channel = lttng_event_container_get_channel(container); | |
974 | ||
975 | return channel->free_event_id == -1U; | |
976 | } | |
977 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
978 | { | |
979 | struct lttng_counter *counter = lttng_event_container_get_counter(container); | |
980 | size_t nr_dimensions, max_nr_elem; | |
981 | ||
982 | if (lttng_counter_get_nr_dimensions(&counter->counter->config, | |
983 | counter->counter, &nr_dimensions)) | |
984 | return true; | |
985 | WARN_ON_ONCE(nr_dimensions != 1); | |
986 | if (nr_dimensions != 1) | |
987 | return true; | |
988 | if (lttng_counter_get_max_nr_elem(&counter->counter->config, | |
989 | counter->counter, &max_nr_elem)) | |
990 | return true; | |
991 | return counter->free_index >= max_nr_elem; | |
992 | } | |
993 | default: | |
994 | WARN_ON_ONCE(1); | |
995 | return true; | |
996 | } | |
997 | } | |
998 | ||
999 | ||
1000 | static | |
1001 | int lttng_event_container_allocate_id(struct lttng_event_container *container, | |
1002 | const char *key_string, size_t *id) | |
1003 | { | |
1004 | struct lttng_session *session = container->session; | |
1005 | struct lttng_event *event; | |
1006 | ||
1007 | if (key_string[0]) { | |
1008 | struct hlist_head *head; | |
1009 | ||
1010 | head = utils_borrow_hash_table_bucket(session->events_key_ht.table, | |
1011 | LTTNG_EVENT_HT_SIZE, key_string); | |
1012 | lttng_hlist_for_each_entry(event, head, key_hlist) { | |
1013 | if (!strcmp(key_string, event->key)) { | |
1014 | /* Same key, use same id. */ | |
1015 | *id = event->id; | |
1016 | return 0; | |
1017 | } | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | if (lttng_event_container_current_id_full(container)) { | |
1022 | return -EMFILE; | |
1023 | } | |
1024 | ||
1025 | switch (container->type) { | |
1026 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1027 | { | |
1028 | struct lttng_channel *channel = lttng_event_container_get_channel(container); | |
1029 | *id = channel->free_event_id++; | |
1030 | break; | |
1031 | } | |
1032 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1033 | { | |
1034 | struct lttng_counter *counter = lttng_event_container_get_counter(container); | |
1035 | *id = counter->free_index++; | |
1036 | break; | |
1037 | } | |
1038 | default: | |
1039 | WARN_ON_ONCE(1); | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static | |
1047 | int format_event_key(char *key_string, const struct lttng_counter_key *key, | |
1048 | const char *event_name) | |
1049 | { | |
1050 | const struct lttng_counter_key_dimension *dim; | |
1051 | size_t i, left = LTTNG_KEY_TOKEN_STRING_LEN_MAX; | |
1052 | ||
1053 | key_string[0] = '\0'; | |
1054 | if (!key || !key->nr_dimensions) | |
1055 | return 0; | |
1056 | /* Currently event keys can only be specified on a single dimension. */ | |
1057 | if (key->nr_dimensions != 1) | |
1058 | return -EINVAL; | |
1059 | dim = &key->key_dimensions[0]; | |
1060 | for (i = 0; i < dim->nr_key_tokens; i++) { | |
1061 | const struct lttng_key_token *token = &dim->key_tokens[i]; | |
1062 | size_t token_len; | |
1063 | const char *str; | |
1064 | ||
1065 | switch (token->type) { | |
1066 | case LTTNG_KEY_TOKEN_STRING: | |
1067 | str = token->arg.string; | |
1068 | break; | |
1069 | case LTTNG_KEY_TOKEN_EVENT_NAME: | |
1070 | str = event_name; | |
1071 | break; | |
1072 | default: | |
1073 | return -EINVAL; | |
1074 | } | |
1075 | token_len = strlen(str); | |
1076 | if (token_len >= left) | |
1077 | return -EINVAL; | |
1078 | strcat(key_string, str); | |
1079 | left -= token_len; | |
1080 | } | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static | |
1085 | bool match_event_token(struct lttng_event_container *container, | |
1086 | struct lttng_event *event, uint64_t token) | |
1087 | { | |
1088 | if (container->coalesce_hits) | |
1089 | return true; | |
1090 | if (event->user_token == token) | |
1091 | return true; | |
1092 | return false; | |
1093 | } | |
1094 | ||
1095 | static | |
1096 | int lttng_counter_append_descriptor(struct lttng_counter *counter, | |
1097 | uint64_t user_token, | |
1098 | size_t index, | |
1099 | const char *key) | |
1100 | { | |
1101 | struct lttng_counter_map *map = &counter->map; | |
1102 | struct lttng_counter_map_descriptor *last; | |
1103 | int ret = 0; | |
1104 | ||
1105 | if (strlen(key) >= LTTNG_KERNEL_COUNTER_KEY_LEN) { | |
1106 | WARN_ON_ONCE(1); | |
1107 | return -EOVERFLOW; | |
1108 | } | |
1109 | mutex_lock(&map->lock); | |
1110 | if (map->nr_descriptors == map->alloc_len) { | |
1111 | struct lttng_counter_map_descriptor *new_table, *old_table; | |
1112 | size_t old_len = map->nr_descriptors; | |
1113 | size_t new_len = max_t(size_t, old_len + 1, map->alloc_len * 2); | |
1114 | ||
1115 | old_table = map->descriptors; | |
1116 | new_table = lttng_kvzalloc(sizeof(struct lttng_counter_map_descriptor) * new_len, | |
1117 | GFP_KERNEL); | |
1118 | if (!new_table) { | |
1119 | ret = -ENOMEM; | |
1120 | goto unlock; | |
1121 | } | |
1122 | ||
1123 | if (old_table) | |
1124 | memcpy(new_table, old_table, old_len * sizeof(struct lttng_counter_map_descriptor)); | |
1125 | ||
1126 | map->descriptors = new_table; | |
1127 | map->alloc_len = new_len; | |
1128 | lttng_kvfree(old_table); | |
1129 | } | |
1130 | last = &map->descriptors[map->nr_descriptors++]; | |
1131 | last->user_token = user_token; | |
1132 | last->array_index = index; | |
1133 | strcpy(last->key, key); | |
1134 | unlock: | |
1135 | mutex_unlock(&map->lock); | |
1136 | return ret; | |
1137 | } | |
a101fa10 | 1138 | |
e5382b6d MD |
1139 | /* |
1140 | * Supports event creation while tracing session is active. | |
3c997079 | 1141 | * Needs to be called with sessions mutex held. |
e5382b6d | 1142 | */ |
710e9669 | 1143 | struct lttng_event *_lttng_event_create(struct lttng_event_container *container, |
3c997079 | 1144 | struct lttng_kernel_event *event_param, |
710e9669 | 1145 | const struct lttng_counter_key *key, |
3c997079 MD |
1146 | void *filter, |
1147 | const struct lttng_event_desc *event_desc, | |
710e9669 MD |
1148 | enum lttng_kernel_instrumentation itype, |
1149 | uint64_t token) | |
4e3c1b9b | 1150 | { |
710e9669 | 1151 | struct lttng_session *session; |
a90917c3 | 1152 | struct lttng_event *event; |
710e9669 MD |
1153 | char event_name[LTTNG_KERNEL_SYM_NAME_LEN]; |
1154 | struct hlist_head *name_head, *key_head; | |
1155 | char key_string[LTTNG_KEY_TOKEN_STRING_LEN_MAX]; | |
3d084699 | 1156 | int ret; |
4e3c1b9b | 1157 | |
710e9669 | 1158 | session = container->session; |
3c997079 MD |
1159 | switch (itype) { |
1160 | case LTTNG_KERNEL_TRACEPOINT: | |
710e9669 MD |
1161 | if (strlen(event_desc->name) >= LTTNG_KERNEL_SYM_NAME_LEN) { |
1162 | ret = -EINVAL; | |
1163 | goto type_error; | |
1164 | } | |
1165 | strcpy(event_name, event_desc->name); | |
3c997079 MD |
1166 | break; |
1167 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 1168 | case LTTNG_KERNEL_UPROBE: |
33a39a3c | 1169 | case LTTNG_KERNEL_SYSCALL: |
710e9669 MD |
1170 | if (strlen(event_param->name) >= LTTNG_KERNEL_SYM_NAME_LEN) { |
1171 | ret = -EINVAL; | |
1172 | goto type_error; | |
1173 | } | |
1174 | strcpy(event_name, event_param->name); | |
1175 | break; | |
1176 | case LTTNG_KERNEL_KRETPROBE: | |
1177 | if (strlen(event_param->name) >= LTTNG_KERNEL_SYM_NAME_LEN) { | |
1178 | ret = -EINVAL; | |
1179 | goto type_error; | |
1180 | } | |
1181 | strcpy(event_name, event_param->name); | |
1182 | if (strlen(event_name) + strlen("_entry") >= LTTNG_KERNEL_SYM_NAME_LEN) { | |
1183 | ret = -EINVAL; | |
1184 | goto type_error; | |
1185 | } | |
1186 | strcat(event_name, "_entry"); | |
3c997079 | 1187 | break; |
e884017c | 1188 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
710e9669 | 1189 | case LTTNG_KERNEL_NOOP: /* Fall-through. */ |
3c997079 MD |
1190 | default: |
1191 | WARN_ON_ONCE(1); | |
1192 | ret = -EINVAL; | |
1193 | goto type_error; | |
1194 | } | |
4a11ef1c | 1195 | |
710e9669 MD |
1196 | if (format_event_key(key_string, key, event_name)) { |
1197 | ret = -EINVAL; | |
1198 | goto type_error; | |
1199 | } | |
1200 | ||
1201 | name_head = utils_borrow_hash_table_bucket(session->events_name_ht.table, | |
4a11ef1c | 1202 | LTTNG_EVENT_HT_SIZE, event_name); |
710e9669 MD |
1203 | lttng_hlist_for_each_entry(event, name_head, name_hlist) { |
1204 | bool same_event = false, same_container = false, same_key = false, | |
1205 | same_token = false; | |
1206 | ||
3c997079 | 1207 | WARN_ON_ONCE(!event->desc); |
710e9669 MD |
1208 | if (event_desc) { |
1209 | if (event->desc == event_desc) | |
1210 | same_event = true; | |
1211 | } else { | |
1212 | if (!strcmp(event_name, event->desc->name)) | |
1213 | same_event = true; | |
1214 | } | |
1215 | if (container == event->container) { | |
1216 | same_container = true; | |
1217 | if (match_event_token(container, event, token)) | |
1218 | same_token = true; | |
1219 | } | |
1220 | if (key_string[0] == '\0' || !strcmp(key_string, event->key)) | |
1221 | same_key = true; | |
1222 | if (same_event && same_container && same_key && same_token) { | |
3c997079 MD |
1223 | ret = -EEXIST; |
1224 | goto exist; | |
abc0446a MD |
1225 | } |
1226 | } | |
3c997079 | 1227 | |
11b5a3c2 | 1228 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 1229 | if (!event) { |
4cf0bf51 | 1230 | ret = -ENOMEM; |
4e3c1b9b | 1231 | goto cache_error; |
abc0446a | 1232 | } |
710e9669 | 1233 | event->container = container; |
4e3c1b9b | 1234 | event->filter = filter; |
3c997079 MD |
1235 | event->instrumentation = itype; |
1236 | event->evtype = LTTNG_TYPE_EVENT; | |
710e9669 MD |
1237 | if (!container->coalesce_hits) |
1238 | event->user_token = token; | |
183e8b3a | 1239 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 | 1240 | INIT_LIST_HEAD(&event->enablers_ref_head); |
710e9669 MD |
1241 | if (lttng_event_container_allocate_id(container, key_string, |
1242 | &event->id)) { | |
1243 | ret = -EMFILE; | |
1244 | goto full; | |
1245 | } | |
1246 | if (key_string[0]) { | |
1247 | key_head = utils_borrow_hash_table_bucket(session->events_key_ht.table, | |
1248 | LTTNG_EVENT_HT_SIZE, key_string); | |
1249 | hlist_add_head(&event->key_hlist, key_head); | |
1250 | } | |
1251 | strcpy(event->key, key_string); | |
3c997079 MD |
1252 | |
1253 | switch (itype) { | |
ab2277d6 | 1254 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
1255 | /* Event will be enabled by enabler sync. */ |
1256 | event->enabled = 0; | |
1257 | event->registered = 0; | |
0bcedee9 | 1258 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 1259 | if (!event->desc) { |
4cf0bf51 | 1260 | ret = -ENOENT; |
d3dbe23c | 1261 | goto register_error; |
abc0446a | 1262 | } |
3c997079 MD |
1263 | /* Populate lttng_event structure before event registration. */ |
1264 | smp_wmb(); | |
baf20995 | 1265 | break; |
ab2277d6 | 1266 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
1267 | /* |
1268 | * Needs to be explicitly enabled after creation, since | |
1269 | * we may want to apply filters. | |
1270 | */ | |
1271 | event->enabled = 0; | |
3c997079 MD |
1272 | event->registered = 1; |
1273 | /* | |
1274 | * Populate lttng_event structure before event | |
1275 | * registration. | |
1276 | */ | |
1277 | smp_wmb(); | |
8bf17deb | 1278 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1279 | event_param->u.kprobe.symbol_name, |
1280 | event_param->u.kprobe.offset, | |
1281 | event_param->u.kprobe.addr, | |
1282 | event); | |
abc0446a | 1283 | if (ret) { |
4cf0bf51 | 1284 | ret = -EINVAL; |
d6d808f3 | 1285 | goto register_error; |
abc0446a | 1286 | } |
710e9669 | 1287 | event->u.kprobe.user_token = token; |
edeb3137 MD |
1288 | ret = try_module_get(event->desc->owner); |
1289 | WARN_ON_ONCE(!ret); | |
710e9669 MD |
1290 | |
1291 | /* Append descriptor to counter. */ | |
1292 | switch (container->type) { | |
1293 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1294 | { | |
1295 | struct lttng_counter *counter; | |
1296 | const char *name = "<UNKNOWN>"; | |
1297 | int ret; | |
1298 | ||
1299 | counter = lttng_event_container_get_counter(container); | |
1300 | if (event->key[0]) | |
1301 | name = event->key; | |
1302 | else | |
1303 | name = event_name; | |
1304 | ret = lttng_counter_append_descriptor(counter, | |
1305 | token, event->id, | |
1306 | name); | |
1307 | if (ret) { | |
1308 | WARN_ON_ONCE(1); | |
1309 | } | |
1310 | break; | |
1311 | } | |
1312 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1313 | default: | |
1314 | break; | |
1315 | } | |
d6d808f3 | 1316 | break; |
7371f44c MD |
1317 | case LTTNG_KERNEL_KRETPROBE: |
1318 | { | |
a90917c3 | 1319 | struct lttng_event *event_return; |
7371f44c MD |
1320 | |
1321 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1322 | /* |
1323 | * Needs to be explicitly enabled after creation, since | |
1324 | * we may want to apply filters. | |
1325 | */ | |
1326 | event->enabled = 0; | |
3c997079 | 1327 | event->registered = 1; |
710e9669 MD |
1328 | event->u.kretprobe.user_token = token; |
1329 | ||
1330 | /* Append descriptor to counter. */ | |
1331 | switch (container->type) { | |
1332 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1333 | { | |
1334 | struct lttng_counter *counter; | |
1335 | const char *name = "<UNKNOWN>"; | |
1336 | int ret; | |
1337 | ||
1338 | counter = lttng_event_container_get_counter(container); | |
1339 | if (event->key[0]) | |
1340 | name = event->key; | |
1341 | else | |
1342 | name = event_name; | |
1343 | ret = lttng_counter_append_descriptor(counter, | |
1344 | token, event->id, | |
1345 | name); | |
1346 | if (ret) { | |
1347 | WARN_ON_ONCE(1); | |
1348 | } | |
1349 | break; | |
1350 | } | |
1351 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1352 | default: | |
1353 | break; | |
1354 | } | |
1355 | ||
7371f44c MD |
1356 | event_return = |
1357 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 1358 | if (!event_return) { |
4cf0bf51 | 1359 | ret = -ENOMEM; |
7371f44c | 1360 | goto register_error; |
abc0446a | 1361 | } |
710e9669 | 1362 | event_return->container = container; |
7371f44c | 1363 | event_return->filter = filter; |
710e9669 MD |
1364 | |
1365 | strcpy(event_name, event_param->name); | |
1366 | if (strlen(event_name) + strlen("_return") >= LTTNG_KERNEL_SYM_NAME_LEN) { | |
1367 | ret = -EINVAL; | |
1368 | goto register_error; | |
1369 | } | |
1370 | strcat(event_name, "_return"); | |
1371 | if (format_event_key(key_string, key, event_name)) { | |
1372 | ret = -EINVAL; | |
1373 | goto register_error; | |
1374 | } | |
1375 | if (lttng_event_container_allocate_id(container, key_string, &event_return->id)) { | |
1376 | kmem_cache_free(event_cache, event_return); | |
1377 | ret = -EMFILE; | |
1378 | goto register_error; | |
1379 | } | |
1380 | key_head = utils_borrow_hash_table_bucket(session->events_key_ht.table, | |
1381 | LTTNG_EVENT_HT_SIZE, key_string); | |
1382 | hlist_add_head(&event_return->key_hlist, key_head); | |
a0493bef | 1383 | event_return->enabled = 0; |
3c997079 MD |
1384 | event_return->registered = 1; |
1385 | event_return->instrumentation = itype; | |
484ec217 FD |
1386 | INIT_LIST_HEAD(&event_return->filter_bytecode_runtime_head); |
1387 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
710e9669 MD |
1388 | event_return->u.kretprobe.user_token = token; |
1389 | strcpy(event_return->key, key_string); | |
7371f44c | 1390 | /* |
a90917c3 | 1391 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1392 | */ |
1393 | smp_wmb(); | |
3c997079 | 1394 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1395 | event_param->u.kretprobe.symbol_name, |
1396 | event_param->u.kretprobe.offset, | |
1397 | event_param->u.kretprobe.addr, | |
1398 | event, event_return); | |
1399 | if (ret) { | |
1400 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 1401 | ret = -EINVAL; |
7371f44c MD |
1402 | goto register_error; |
1403 | } | |
1404 | /* Take 2 refs on the module: one per event. */ | |
1405 | ret = try_module_get(event->desc->owner); | |
1406 | WARN_ON_ONCE(!ret); | |
1407 | ret = try_module_get(event->desc->owner); | |
1408 | WARN_ON_ONCE(!ret); | |
710e9669 MD |
1409 | |
1410 | /* Append exit descriptor to counter. */ | |
1411 | switch (container->type) { | |
1412 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1413 | { | |
1414 | struct lttng_counter *counter; | |
1415 | const char *name = "<UNKNOWN>"; | |
1416 | int ret; | |
1417 | ||
1418 | counter = lttng_event_container_get_counter(container); | |
1419 | if (event_return->key[0]) | |
1420 | name = event_return->key; | |
1421 | else | |
1422 | name = event_name; | |
1423 | ret = lttng_counter_append_descriptor(counter, | |
1424 | token, event_return->id, | |
1425 | name); | |
1426 | if (ret) { | |
1427 | WARN_ON_ONCE(1); | |
1428 | } | |
1429 | break; | |
1430 | } | |
1431 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1432 | default: | |
1433 | break; | |
1434 | } | |
1435 | switch (container->type) { | |
1436 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1437 | ret = _lttng_event_metadata_statedump(session, event_return); | |
1438 | WARN_ON_ONCE(ret > 0); | |
1439 | if (ret) { | |
1440 | kmem_cache_free(event_cache, event_return); | |
1441 | module_put(event->desc->owner); | |
1442 | module_put(event->desc->owner); | |
1443 | goto statedump_error; | |
1444 | } | |
1445 | break; | |
1446 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1447 | default: | |
1448 | break; | |
7371f44c | 1449 | } |
710e9669 | 1450 | list_add(&event_return->list, &session->events); |
7371f44c MD |
1451 | break; |
1452 | } | |
33a39a3c | 1453 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
1454 | /* |
1455 | * Needs to be explicitly enabled after creation, since | |
1456 | * we may want to apply filters. | |
1457 | */ | |
1458 | event->enabled = 0; | |
3c997079 MD |
1459 | event->registered = 0; |
1460 | event->desc = event_desc; | |
badfe9f5 MD |
1461 | switch (event_param->u.syscall.entryexit) { |
1462 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1463 | ret = -EINVAL; | |
1464 | goto register_error; | |
1465 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1466 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1467 | break; | |
1468 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1469 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1470 | break; | |
1471 | } | |
1472 | switch (event_param->u.syscall.abi) { | |
1473 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1474 | ret = -EINVAL; | |
1475 | goto register_error; | |
1476 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1477 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1478 | break; | |
1479 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1480 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1481 | break; | |
1482 | } | |
abc0446a | 1483 | if (!event->desc) { |
4cf0bf51 | 1484 | ret = -EINVAL; |
259b6cb3 | 1485 | goto register_error; |
abc0446a | 1486 | } |
1ec65de1 | 1487 | break; |
149b9a9d | 1488 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1489 | /* |
1490 | * Needs to be explicitly enabled after creation, since | |
1491 | * we may want to apply filters. | |
1492 | */ | |
1493 | event->enabled = 0; | |
1494 | event->registered = 1; | |
710e9669 | 1495 | event->u.uprobe.user_token = token; |
3aed4dca | 1496 | |
a344f64b FD |
1497 | /* |
1498 | * Populate lttng_event structure before event | |
1499 | * registration. | |
1500 | */ | |
1501 | smp_wmb(); | |
149b9a9d | 1502 | |
710e9669 | 1503 | ret = lttng_uprobes_register_event(event_name, |
56377c91 | 1504 | event_param->u.uprobe.fd, |
149b9a9d YB |
1505 | event); |
1506 | if (ret) | |
1507 | goto register_error; | |
1508 | ret = try_module_get(event->desc->owner); | |
1509 | WARN_ON_ONCE(!ret); | |
710e9669 MD |
1510 | |
1511 | /* Append descriptor to counter. */ | |
1512 | switch (container->type) { | |
1513 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1514 | { | |
1515 | struct lttng_counter *counter; | |
1516 | const char *name = "<UNKNOWN>"; | |
1517 | int ret; | |
1518 | ||
1519 | counter = lttng_event_container_get_counter(container); | |
1520 | if (event->key[0]) | |
1521 | name = event->key; | |
1522 | else | |
1523 | name = event_name; | |
1524 | ret = lttng_counter_append_descriptor(counter, | |
1525 | token, event->id, | |
1526 | name); | |
1527 | if (ret) { | |
1528 | WARN_ON_ONCE(1); | |
1529 | } | |
1530 | break; | |
1531 | } | |
1532 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1533 | default: | |
1534 | break; | |
1535 | } | |
149b9a9d | 1536 | break; |
710e9669 MD |
1537 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
1538 | case LTTNG_KERNEL_NOOP: /* Fall-through.*/ | |
baf20995 MD |
1539 | default: |
1540 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1541 | ret = -EINVAL; |
df07930b | 1542 | goto register_error; |
baf20995 | 1543 | } |
710e9669 MD |
1544 | switch (container->type) { |
1545 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
1546 | ret = _lttng_event_metadata_statedump(session, event); | |
1547 | WARN_ON_ONCE(ret > 0); | |
1548 | if (ret) { | |
1549 | goto statedump_error; | |
1550 | } | |
1551 | break; | |
1552 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
1553 | default: | |
1554 | break; | |
abc0446a | 1555 | } |
710e9669 MD |
1556 | hlist_add_head(&event->name_hlist, name_head); |
1557 | list_add(&event->list, &session->events); | |
4e3c1b9b MD |
1558 | return event; |
1559 | ||
c099397a | 1560 | statedump_error: |
259b6cb3 | 1561 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1562 | register_error: |
710e9669 | 1563 | full: |
11b5a3c2 | 1564 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1565 | cache_error: |
1566 | exist: | |
3c997079 | 1567 | type_error: |
4cf0bf51 | 1568 | return ERR_PTR(ret); |
4e3c1b9b MD |
1569 | } |
1570 | ||
dffef45d FD |
1571 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1572 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1573 | uint64_t token, uint64_t error_counter_index, |
1574 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1575 | struct lttng_kernel_event_notifier *event_notifier_param, |
1576 | void *filter, enum lttng_kernel_instrumentation itype) | |
1577 | { | |
1578 | struct lttng_event_notifier *event_notifier; | |
ab04d7b1 | 1579 | struct lttng_counter *error_counter; |
dffef45d FD |
1580 | const char *event_name; |
1581 | struct hlist_head *head; | |
1582 | int ret; | |
1583 | ||
1584 | switch (itype) { | |
1585 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1586 | event_name = event_desc->name; |
1587 | break; | |
dffef45d | 1588 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1589 | case LTTNG_KERNEL_UPROBE: |
8a8ac9a8 | 1590 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1591 | event_name = event_notifier_param->event.name; |
1592 | break; | |
dffef45d FD |
1593 | case LTTNG_KERNEL_KRETPROBE: |
1594 | case LTTNG_KERNEL_FUNCTION: | |
1595 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1596 | default: |
1597 | WARN_ON_ONCE(1); | |
1598 | ret = -EINVAL; | |
1599 | goto type_error; | |
1600 | } | |
1601 | ||
1602 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1603 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1604 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1605 | WARN_ON_ONCE(!event_notifier->desc); | |
1606 | if (!strncmp(event_notifier->desc->name, event_name, | |
1607 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1608 | && event_notifier_group == event_notifier->group | |
1609 | && token == event_notifier->user_token) { | |
1610 | ret = -EEXIST; | |
1611 | goto exist; | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1616 | if (!event_notifier) { | |
1617 | ret = -ENOMEM; | |
1618 | goto cache_error; | |
1619 | } | |
21f58fb7 | 1620 | |
dffef45d FD |
1621 | event_notifier->group = event_notifier_group; |
1622 | event_notifier->user_token = token; | |
99f52fcc | 1623 | event_notifier->error_counter_index = error_counter_index; |
99d223ad | 1624 | event_notifier->num_captures = 0; |
dffef45d FD |
1625 | event_notifier->filter = filter; |
1626 | event_notifier->instrumentation = itype; | |
1627 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1628 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1629 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1630 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1631 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1632 | ||
1633 | switch (itype) { | |
1634 | case LTTNG_KERNEL_TRACEPOINT: | |
1635 | /* Event will be enabled by enabler sync. */ | |
1636 | event_notifier->enabled = 0; | |
1637 | event_notifier->registered = 0; | |
1638 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1639 | if (!event_notifier->desc) { | |
1640 | ret = -ENOENT; | |
1641 | goto register_error; | |
1642 | } | |
1643 | /* Populate lttng_event_notifier structure before event registration. */ | |
1644 | smp_wmb(); | |
1645 | break; | |
1646 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1647 | /* |
1648 | * Needs to be explicitly enabled after creation, since | |
1649 | * we may want to apply filters. | |
1650 | */ | |
1651 | event_notifier->enabled = 0; | |
1652 | event_notifier->registered = 1; | |
1653 | /* | |
1654 | * Populate lttng_event_notifier structure before event | |
1655 | * registration. | |
1656 | */ | |
1657 | smp_wmb(); | |
1658 | ret = lttng_kprobes_register_event_notifier( | |
1659 | event_notifier_param->event.u.kprobe.symbol_name, | |
1660 | event_notifier_param->event.u.kprobe.offset, | |
1661 | event_notifier_param->event.u.kprobe.addr, | |
1662 | event_notifier); | |
1663 | if (ret) { | |
1664 | ret = -EINVAL; | |
1665 | goto register_error; | |
1666 | } | |
1667 | ret = try_module_get(event_notifier->desc->owner); | |
1668 | WARN_ON_ONCE(!ret); | |
1669 | break; | |
8a8ac9a8 FD |
1670 | case LTTNG_KERNEL_NOOP: |
1671 | case LTTNG_KERNEL_SYSCALL: | |
1672 | /* | |
1673 | * Needs to be explicitly enabled after creation, since | |
1674 | * we may want to apply filters. | |
1675 | */ | |
1676 | event_notifier->enabled = 0; | |
1677 | event_notifier->registered = 0; | |
1678 | event_notifier->desc = event_desc; | |
1679 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1680 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1681 | ret = -EINVAL; | |
1682 | goto register_error; | |
1683 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1684 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1685 | break; | |
1686 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1687 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1688 | break; | |
1689 | } | |
1690 | switch (event_notifier_param->event.u.syscall.abi) { | |
1691 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1692 | ret = -EINVAL; | |
1693 | goto register_error; | |
1694 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1695 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1696 | break; | |
1697 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1698 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1699 | break; | |
1700 | } | |
1701 | ||
1702 | if (!event_notifier->desc) { | |
1703 | ret = -EINVAL; | |
1704 | goto register_error; | |
1705 | } | |
1706 | break; | |
dffef45d | 1707 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1708 | /* |
1709 | * Needs to be explicitly enabled after creation, since | |
1710 | * we may want to apply filters. | |
1711 | */ | |
1712 | event_notifier->enabled = 0; | |
1713 | event_notifier->registered = 1; | |
1714 | ||
1715 | /* | |
1716 | * Populate lttng_event_notifier structure before | |
1717 | * event_notifier registration. | |
1718 | */ | |
1719 | smp_wmb(); | |
1720 | ||
1721 | ret = lttng_uprobes_register_event_notifier( | |
1722 | event_notifier_param->event.name, | |
1723 | event_notifier_param->event.u.uprobe.fd, | |
1724 | event_notifier); | |
1725 | if (ret) | |
1726 | goto register_error; | |
1727 | ret = try_module_get(event_notifier->desc->owner); | |
1728 | WARN_ON_ONCE(!ret); | |
1729 | break; | |
dffef45d FD |
1730 | case LTTNG_KERNEL_KRETPROBE: |
1731 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1732 | default: |
1733 | WARN_ON_ONCE(1); | |
1734 | ret = -EINVAL; | |
1735 | goto register_error; | |
1736 | } | |
1737 | ||
1738 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1739 | hlist_add_head(&event_notifier->hlist, head); | |
99f52fcc FD |
1740 | |
1741 | /* | |
1742 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1743 | * bucket is currently in use. We trust it. The session lock |
1744 | * synchronizes against concurrent creation of the error | |
1745 | * counter. | |
99f52fcc | 1746 | */ |
ab04d7b1 MD |
1747 | error_counter = event_notifier_group->error_counter; |
1748 | if (error_counter) { | |
99f52fcc FD |
1749 | size_t dimension_index[1]; |
1750 | ||
1751 | /* | |
1752 | * Check that the index is within the boundary of the counter. | |
1753 | */ | |
1754 | if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) { | |
1755 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1756 | event_notifier_group->error_counter_len, event_notifier->error_counter_index); | |
1757 | ret = -EINVAL; | |
1758 | goto register_error; | |
1759 | } | |
1760 | ||
1761 | dimension_index[0] = event_notifier->error_counter_index; | |
ab04d7b1 | 1762 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1763 | if (ret) { |
1764 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1765 | event_notifier->error_counter_index); | |
1766 | goto register_error; | |
1767 | } | |
1768 | } | |
1769 | ||
dffef45d FD |
1770 | return event_notifier; |
1771 | ||
1772 | register_error: | |
1773 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1774 | cache_error: | |
1775 | exist: | |
1776 | type_error: | |
1777 | return ERR_PTR(ret); | |
1778 | } | |
1779 | ||
99f52fcc FD |
1780 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1781 | const size_t *dim_indexes, int32_t cpu, | |
1782 | int64_t *val, bool *overflow, bool *underflow) | |
1783 | { | |
1784 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1785 | cpu, val, overflow, underflow); | |
1786 | } | |
1787 | ||
1788 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1789 | const size_t *dim_indexes, int64_t *val, | |
1790 | bool *overflow, bool *underflow) | |
1791 | { | |
1792 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1793 | val, overflow, underflow); | |
1794 | } | |
1795 | ||
1796 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1797 | const size_t *dim_indexes) | |
1798 | { | |
1799 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1800 | } | |
1801 | ||
710e9669 | 1802 | struct lttng_event *lttng_event_create(struct lttng_event_container *container, |
3c997079 | 1803 | struct lttng_kernel_event *event_param, |
710e9669 | 1804 | const struct lttng_counter_key *key, |
3c997079 MD |
1805 | void *filter, |
1806 | const struct lttng_event_desc *event_desc, | |
710e9669 MD |
1807 | enum lttng_kernel_instrumentation itype, |
1808 | uint64_t token) | |
3c997079 MD |
1809 | { |
1810 | struct lttng_event *event; | |
1811 | ||
1812 | mutex_lock(&sessions_mutex); | |
710e9669 MD |
1813 | event = _lttng_event_create(container, event_param, key, filter, event_desc, |
1814 | itype, token); | |
3c997079 MD |
1815 | mutex_unlock(&sessions_mutex); |
1816 | return event; | |
1817 | } | |
1818 | ||
dffef45d FD |
1819 | struct lttng_event_notifier *lttng_event_notifier_create( |
1820 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1821 | uint64_t id, uint64_t error_counter_index, |
1822 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1823 | struct lttng_kernel_event_notifier *event_notifier_param, |
1824 | void *filter, enum lttng_kernel_instrumentation itype) | |
1825 | { | |
1826 | struct lttng_event_notifier *event_notifier; | |
1827 | ||
1828 | mutex_lock(&sessions_mutex); | |
1829 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc FD |
1830 | error_counter_index, event_notifier_group, |
1831 | event_notifier_param, filter, itype); | |
dffef45d FD |
1832 | mutex_unlock(&sessions_mutex); |
1833 | return event_notifier; | |
1834 | } | |
1835 | ||
3c997079 MD |
1836 | /* Only used for tracepoints for now. */ |
1837 | static | |
1838 | void register_event(struct lttng_event *event) | |
1839 | { | |
1840 | const struct lttng_event_desc *desc; | |
f127e61e | 1841 | int ret = -EINVAL; |
3c997079 | 1842 | |
3c997079 MD |
1843 | if (event->registered) |
1844 | return; | |
4ecb5ad5 | 1845 | |
3c997079 | 1846 | desc = event->desc; |
4ecb5ad5 MD |
1847 | switch (event->instrumentation) { |
1848 | case LTTNG_KERNEL_TRACEPOINT: | |
1849 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
710e9669 | 1850 | desc->probe_callback, event); |
4ecb5ad5 MD |
1851 | break; |
1852 | case LTTNG_KERNEL_SYSCALL: | |
710e9669 | 1853 | ret = lttng_syscall_filter_enable_event(event->container, event); |
4ecb5ad5 MD |
1854 | break; |
1855 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1856 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1857 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1858 | case LTTNG_KERNEL_NOOP: |
1859 | ret = 0; | |
1860 | break; | |
e884017c | 1861 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1862 | default: |
1863 | WARN_ON_ONCE(1); | |
1864 | } | |
3c997079 MD |
1865 | if (!ret) |
1866 | event->registered = 1; | |
1867 | } | |
1868 | ||
4e3c1b9b MD |
1869 | /* |
1870 | * Only used internally at session destruction. | |
1871 | */ | |
a90917c3 | 1872 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1873 | { |
4ecb5ad5 | 1874 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1875 | int ret = -EINVAL; |
1876 | ||
3c997079 MD |
1877 | if (!event->registered) |
1878 | return 0; | |
1879 | ||
4ecb5ad5 | 1880 | desc = event->desc; |
38d024ae | 1881 | switch (event->instrumentation) { |
ab2277d6 | 1882 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1883 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
710e9669 | 1884 | event->desc->probe_callback, event); |
baf20995 | 1885 | break; |
ab2277d6 | 1886 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1887 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1888 | ret = 0; |
1889 | break; | |
7371f44c MD |
1890 | case LTTNG_KERNEL_KRETPROBE: |
1891 | lttng_kretprobes_unregister(event); | |
1892 | ret = 0; | |
1893 | break; | |
33a39a3c | 1894 | case LTTNG_KERNEL_SYSCALL: |
710e9669 | 1895 | ret = lttng_syscall_filter_disable_event(event->container, event); |
4ecb5ad5 MD |
1896 | break; |
1897 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1898 | ret = 0; |
1899 | break; | |
149b9a9d | 1900 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1901 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1902 | ret = 0; |
1903 | break; | |
e884017c | 1904 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1905 | default: |
1906 | WARN_ON_ONCE(1); | |
1907 | } | |
3c997079 MD |
1908 | if (!ret) |
1909 | event->registered = 0; | |
dda6a249 MD |
1910 | return ret; |
1911 | } | |
1912 | ||
dffef45d FD |
1913 | /* Only used for tracepoints for now. */ |
1914 | static | |
b01155ba | 1915 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1916 | { |
1917 | const struct lttng_event_desc *desc; | |
1918 | int ret = -EINVAL; | |
1919 | ||
1920 | if (event_notifier->registered) | |
1921 | return; | |
1922 | ||
1923 | desc = event_notifier->desc; | |
1924 | switch (event_notifier->instrumentation) { | |
1925 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1926 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1927 | desc->event_notifier_callback, | |
1928 | event_notifier); | |
1929 | break; | |
8a8ac9a8 FD |
1930 | case LTTNG_KERNEL_SYSCALL: |
1931 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1932 | break; | |
dffef45d | 1933 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1934 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1935 | ret = 0; |
1936 | break; | |
dffef45d FD |
1937 | case LTTNG_KERNEL_KRETPROBE: |
1938 | case LTTNG_KERNEL_FUNCTION: | |
1939 | case LTTNG_KERNEL_NOOP: | |
1940 | default: | |
1941 | WARN_ON_ONCE(1); | |
1942 | } | |
1943 | if (!ret) | |
1944 | event_notifier->registered = 1; | |
1945 | } | |
1946 | ||
1947 | static | |
1948 | int _lttng_event_notifier_unregister( | |
1949 | struct lttng_event_notifier *event_notifier) | |
1950 | { | |
1951 | const struct lttng_event_desc *desc; | |
1952 | int ret = -EINVAL; | |
1953 | ||
1954 | if (!event_notifier->registered) | |
1955 | return 0; | |
1956 | ||
1957 | desc = event_notifier->desc; | |
1958 | switch (event_notifier->instrumentation) { | |
1959 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1960 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1961 | event_notifier->desc->event_notifier_callback, | |
1962 | event_notifier); | |
1963 | break; | |
dffef45d | 1964 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1965 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1966 | ret = 0; | |
1967 | break; | |
9de67196 FD |
1968 | case LTTNG_KERNEL_UPROBE: |
1969 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1970 | ret = 0; | |
1971 | break; | |
8a8ac9a8 FD |
1972 | case LTTNG_KERNEL_SYSCALL: |
1973 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1974 | break; | |
dffef45d FD |
1975 | case LTTNG_KERNEL_KRETPROBE: |
1976 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1977 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1978 | default: |
1979 | WARN_ON_ONCE(1); | |
1980 | } | |
1981 | if (!ret) | |
1982 | event_notifier->registered = 0; | |
1983 | return ret; | |
1984 | } | |
1985 | ||
dda6a249 MD |
1986 | /* |
1987 | * Only used internally at session destruction. | |
1988 | */ | |
be066e6c | 1989 | static |
a90917c3 | 1990 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1991 | { |
966ad253 MD |
1992 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1993 | ||
edeb3137 MD |
1994 | switch (event->instrumentation) { |
1995 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1996 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1997 | break; |
1998 | case LTTNG_KERNEL_KPROBE: | |
1999 | module_put(event->desc->owner); | |
8bf17deb | 2000 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 2001 | break; |
7371f44c MD |
2002 | case LTTNG_KERNEL_KRETPROBE: |
2003 | module_put(event->desc->owner); | |
2004 | lttng_kretprobes_destroy_private(event); | |
2005 | break; | |
259b6cb3 | 2006 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 2007 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 2008 | break; |
149b9a9d YB |
2009 | case LTTNG_KERNEL_UPROBE: |
2010 | module_put(event->desc->owner); | |
83b802dc | 2011 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 2012 | break; |
e884017c | 2013 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
2014 | default: |
2015 | WARN_ON_ONCE(1); | |
2016 | } | |
dda6a249 | 2017 | list_del(&event->list); |
8070f5c0 | 2018 | lttng_destroy_context(event->ctx); |
966ad253 MD |
2019 | lttng_free_event_filter_runtime(event); |
2020 | /* Free event enabler refs */ | |
2021 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
2022 | &event->enablers_ref_head, node) | |
2023 | kfree(enabler_ref); | |
11b5a3c2 | 2024 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
2025 | } |
2026 | ||
dffef45d FD |
2027 | /* |
2028 | * Only used internally at session destruction. | |
2029 | */ | |
2030 | static | |
2031 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
2032 | { | |
3ef5cc03 MD |
2033 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
2034 | ||
dffef45d FD |
2035 | switch (event_notifier->instrumentation) { |
2036 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
2037 | lttng_event_desc_put(event_notifier->desc); |
2038 | break; | |
dffef45d | 2039 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
2040 | module_put(event_notifier->desc->owner); |
2041 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
2042 | break; | |
8a8ac9a8 FD |
2043 | case LTTNG_KERNEL_NOOP: |
2044 | case LTTNG_KERNEL_SYSCALL: | |
2045 | break; | |
9de67196 FD |
2046 | case LTTNG_KERNEL_UPROBE: |
2047 | module_put(event_notifier->desc->owner); | |
2048 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
2049 | break; | |
dffef45d FD |
2050 | case LTTNG_KERNEL_KRETPROBE: |
2051 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
2052 | default: |
2053 | WARN_ON_ONCE(1); | |
2054 | } | |
2055 | list_del(&event_notifier->list); | |
3ef5cc03 MD |
2056 | lttng_free_event_notifier_filter_runtime(event_notifier); |
2057 | /* Free event enabler refs */ | |
2058 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
2059 | &event_notifier->enablers_ref_head, node) | |
2060 | kfree(enabler_ref); | |
dffef45d FD |
2061 | kmem_cache_free(event_notifier_cache, event_notifier); |
2062 | } | |
2063 | ||
d1f652f8 MD |
2064 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
2065 | enum tracker_type tracker_type) | |
e0130fab | 2066 | { |
d1f652f8 MD |
2067 | switch (tracker_type) { |
2068 | case TRACKER_PID: | |
2069 | return &session->pid_tracker; | |
2070 | case TRACKER_VPID: | |
2071 | return &session->vpid_tracker; | |
2072 | case TRACKER_UID: | |
2073 | return &session->uid_tracker; | |
2074 | case TRACKER_VUID: | |
2075 | return &session->vuid_tracker; | |
2076 | case TRACKER_GID: | |
2077 | return &session->gid_tracker; | |
2078 | case TRACKER_VGID: | |
2079 | return &session->vgid_tracker; | |
2080 | default: | |
2081 | WARN_ON_ONCE(1); | |
2082 | return NULL; | |
2083 | } | |
2084 | } | |
2085 | ||
2086 | int lttng_session_track_id(struct lttng_session *session, | |
2087 | enum tracker_type tracker_type, int id) | |
2088 | { | |
2089 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
2090 | int ret; |
2091 | ||
d1f652f8 MD |
2092 | tracker = get_tracker(session, tracker_type); |
2093 | if (!tracker) | |
2094 | return -EINVAL; | |
2095 | if (id < -1) | |
e0130fab MD |
2096 | return -EINVAL; |
2097 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
2098 | if (id == -1) { |
2099 | /* track all ids: destroy tracker. */ | |
2100 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
2101 | ret = 0; |
2102 | } else { | |
d1f652f8 | 2103 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 2104 | } |
e0130fab MD |
2105 | mutex_unlock(&sessions_mutex); |
2106 | return ret; | |
2107 | } | |
2108 | ||
d1f652f8 MD |
2109 | int lttng_session_untrack_id(struct lttng_session *session, |
2110 | enum tracker_type tracker_type, int id) | |
e0130fab | 2111 | { |
d1f652f8 | 2112 | struct lttng_id_tracker *tracker; |
e0130fab MD |
2113 | int ret; |
2114 | ||
d1f652f8 MD |
2115 | tracker = get_tracker(session, tracker_type); |
2116 | if (!tracker) | |
2117 | return -EINVAL; | |
2118 | if (id < -1) | |
e0130fab MD |
2119 | return -EINVAL; |
2120 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
2121 | if (id == -1) { |
2122 | /* untrack all ids: replace by empty tracker. */ | |
2123 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 2124 | } else { |
d1f652f8 | 2125 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 2126 | } |
e0130fab MD |
2127 | mutex_unlock(&sessions_mutex); |
2128 | return ret; | |
2129 | } | |
2130 | ||
7e6f9ef6 | 2131 | static |
d1f652f8 | 2132 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 2133 | { |
d1f652f8 MD |
2134 | struct lttng_id_tracker *id_tracker = m->private; |
2135 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
2136 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
2137 | int iter = 0, i; |
2138 | ||
2139 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
2140 | if (id_tracker_p) { |
2141 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
2142 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 2143 | |
f934e302 | 2144 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
2145 | if (iter++ >= *pos) |
2146 | return e; | |
2147 | } | |
2148 | } | |
2149 | } else { | |
d1f652f8 | 2150 | /* ID tracker disabled. */ |
7e6f9ef6 | 2151 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 2152 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
2153 | } |
2154 | iter++; | |
2155 | } | |
2156 | /* End of list */ | |
2157 | return NULL; | |
2158 | } | |
2159 | ||
2160 | /* Called with sessions_mutex held. */ | |
2161 | static | |
d1f652f8 | 2162 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 2163 | { |
d1f652f8 MD |
2164 | struct lttng_id_tracker *id_tracker = m->private; |
2165 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
2166 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
2167 | int iter = 0, i; |
2168 | ||
2169 | (*ppos)++; | |
d1f652f8 MD |
2170 | if (id_tracker_p) { |
2171 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
2172 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 2173 | |
f934e302 | 2174 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
2175 | if (iter++ >= *ppos) |
2176 | return e; | |
2177 | } | |
2178 | } | |
2179 | } else { | |
d1f652f8 | 2180 | /* ID tracker disabled. */ |
7e6f9ef6 | 2181 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 2182 | return p; /* empty tracker */ |
7e6f9ef6 MD |
2183 | iter++; |
2184 | } | |
2185 | ||
2186 | /* End of list */ | |
2187 | return NULL; | |
2188 | } | |
2189 | ||
2190 | static | |
d1f652f8 | 2191 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
2192 | { |
2193 | mutex_unlock(&sessions_mutex); | |
2194 | } | |
2195 | ||
2196 | static | |
d1f652f8 | 2197 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 2198 | { |
d1f652f8 MD |
2199 | struct lttng_id_tracker *id_tracker = m->private; |
2200 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
2201 | int id; | |
7e6f9ef6 | 2202 | |
d1f652f8 | 2203 | if (p == id_tracker_p) { |
7e6f9ef6 | 2204 | /* Tracker disabled. */ |
d1f652f8 | 2205 | id = -1; |
7e6f9ef6 | 2206 | } else { |
d1f652f8 | 2207 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 2208 | |
d1f652f8 MD |
2209 | id = lttng_id_tracker_get_node_id(e); |
2210 | } | |
2211 | switch (id_tracker->tracker_type) { | |
2212 | case TRACKER_PID: | |
2213 | seq_printf(m, "process { pid = %d; };\n", id); | |
2214 | break; | |
2215 | case TRACKER_VPID: | |
2216 | seq_printf(m, "process { vpid = %d; };\n", id); | |
2217 | break; | |
2218 | case TRACKER_UID: | |
2219 | seq_printf(m, "user { uid = %d; };\n", id); | |
2220 | break; | |
2221 | case TRACKER_VUID: | |
2222 | seq_printf(m, "user { vuid = %d; };\n", id); | |
2223 | break; | |
2224 | case TRACKER_GID: | |
2225 | seq_printf(m, "group { gid = %d; };\n", id); | |
2226 | break; | |
2227 | case TRACKER_VGID: | |
2228 | seq_printf(m, "group { vgid = %d; };\n", id); | |
2229 | break; | |
2230 | default: | |
2231 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 2232 | } |
7e6f9ef6 MD |
2233 | return 0; |
2234 | } | |
2235 | ||
2236 | static | |
d1f652f8 MD |
2237 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
2238 | .start = id_list_start, | |
2239 | .next = id_list_next, | |
2240 | .stop = id_list_stop, | |
2241 | .show = id_list_show, | |
7e6f9ef6 MD |
2242 | }; |
2243 | ||
2244 | static | |
d1f652f8 | 2245 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 2246 | { |
d1f652f8 | 2247 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
2248 | } |
2249 | ||
2250 | static | |
d1f652f8 | 2251 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
2252 | { |
2253 | struct seq_file *m = file->private_data; | |
d1f652f8 | 2254 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
2255 | int ret; |
2256 | ||
d1f652f8 | 2257 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 2258 | ret = seq_release(inode, file); |
d1f652f8 MD |
2259 | if (!ret) |
2260 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
2261 | return ret; |
2262 | } | |
2263 | ||
d1f652f8 | 2264 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 2265 | .owner = THIS_MODULE, |
d1f652f8 | 2266 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
2267 | .read = seq_read, |
2268 | .llseek = seq_lseek, | |
d1f652f8 | 2269 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
2270 | }; |
2271 | ||
d1f652f8 MD |
2272 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
2273 | enum tracker_type tracker_type) | |
7e6f9ef6 | 2274 | { |
d1f652f8 | 2275 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
2276 | struct seq_file *m; |
2277 | int file_fd, ret; | |
2278 | ||
2279 | file_fd = lttng_get_unused_fd(); | |
2280 | if (file_fd < 0) { | |
2281 | ret = file_fd; | |
2282 | goto fd_error; | |
2283 | } | |
2284 | ||
d1f652f8 MD |
2285 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
2286 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 2287 | NULL, O_RDWR); |
d1f652f8 MD |
2288 | if (IS_ERR(tracker_ids_list_file)) { |
2289 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
2290 | goto file_error; |
2291 | } | |
98d7281c MJ |
2292 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
2293 | ret = -EOVERFLOW; | |
9c1f4643 MD |
2294 | goto refcount_error; |
2295 | } | |
d1f652f8 | 2296 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
2297 | if (ret < 0) |
2298 | goto open_error; | |
d1f652f8 MD |
2299 | m = tracker_ids_list_file->private_data; |
2300 | ||
2301 | m->private = get_tracker(session, tracker_type); | |
2302 | BUG_ON(!m->private); | |
2303 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
2304 | |
2305 | return file_fd; | |
2306 | ||
2307 | open_error: | |
9c1f4643 MD |
2308 | atomic_long_dec(&session->file->f_count); |
2309 | refcount_error: | |
d1f652f8 | 2310 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
2311 | file_error: |
2312 | put_unused_fd(file_fd); | |
2313 | fd_error: | |
2314 | return ret; | |
2315 | } | |
2316 | ||
3c997079 MD |
2317 | /* |
2318 | * Enabler management. | |
2319 | */ | |
2320 | static | |
4993071a PP |
2321 | int lttng_match_enabler_star_glob(const char *desc_name, |
2322 | const char *pattern) | |
3c997079 | 2323 | { |
cbc19040 MD |
2324 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
2325 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
2326 | return 0; |
2327 | return 1; | |
2328 | } | |
2329 | ||
2330 | static | |
4ecb5ad5 MD |
2331 | int lttng_match_enabler_name(const char *desc_name, |
2332 | const char *name) | |
3c997079 | 2333 | { |
4ecb5ad5 | 2334 | if (strcmp(desc_name, name)) |
3c997079 MD |
2335 | return 0; |
2336 | return 1; | |
2337 | } | |
2338 | ||
3c997079 MD |
2339 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
2340 | struct lttng_enabler *enabler) | |
2341 | { | |
4ecb5ad5 | 2342 | const char *desc_name, *enabler_name; |
badfe9f5 | 2343 | bool compat = false, entry = false; |
4ecb5ad5 MD |
2344 | |
2345 | enabler_name = enabler->event_param.name; | |
2346 | switch (enabler->event_param.instrumentation) { | |
2347 | case LTTNG_KERNEL_TRACEPOINT: | |
2348 | desc_name = desc->name; | |
3b861b22 FD |
2349 | switch (enabler->format_type) { |
2350 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2351 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2352 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2353 | return lttng_match_enabler_name(desc_name, enabler_name); |
2354 | default: | |
2355 | return -EINVAL; | |
2356 | } | |
4ecb5ad5 MD |
2357 | break; |
2358 | case LTTNG_KERNEL_SYSCALL: | |
2359 | desc_name = desc->name; | |
badfe9f5 | 2360 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2361 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2362 | compat = true; |
2363 | } | |
4ecb5ad5 MD |
2364 | if (!strncmp(desc_name, "syscall_exit_", |
2365 | strlen("syscall_exit_"))) { | |
2366 | desc_name += strlen("syscall_exit_"); | |
2367 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2368 | strlen("syscall_entry_"))) { | |
2369 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2370 | entry = true; |
4ecb5ad5 MD |
2371 | } else { |
2372 | WARN_ON_ONCE(1); | |
2373 | return -EINVAL; | |
2374 | } | |
badfe9f5 MD |
2375 | switch (enabler->event_param.u.syscall.entryexit) { |
2376 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
2377 | break; | |
2378 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
2379 | if (!entry) | |
2380 | return 0; | |
2381 | break; | |
2382 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
2383 | if (entry) | |
2384 | return 0; | |
2385 | break; | |
2386 | default: | |
2387 | return -EINVAL; | |
2388 | } | |
2389 | switch (enabler->event_param.u.syscall.abi) { | |
2390 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
2391 | break; | |
2392 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
2393 | if (compat) | |
2394 | return 0; | |
2395 | break; | |
2396 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
2397 | if (!compat) | |
2398 | return 0; | |
2399 | break; | |
2400 | default: | |
2401 | return -EINVAL; | |
2402 | } | |
2403 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 2404 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2405 | switch (enabler->format_type) { |
2406 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2407 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2408 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2409 | return lttng_match_enabler_name(desc_name, enabler_name); |
2410 | default: | |
2411 | return -EINVAL; | |
2412 | } | |
2413 | break; | |
cff6938b | 2414 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2415 | return -EINVAL; /* Not implemented. */ |
2416 | default: | |
2417 | return -EINVAL; | |
2418 | } | |
4ecb5ad5 MD |
2419 | break; |
2420 | default: | |
2421 | WARN_ON_ONCE(1); | |
2422 | return -EINVAL; | |
2423 | } | |
3c997079 MD |
2424 | } |
2425 | ||
2426 | static | |
710e9669 | 2427 | bool lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 | 2428 | struct lttng_event *event) |
3c997079 | 2429 | { |
b2bc0bc8 FD |
2430 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2431 | event_enabler); | |
2432 | ||
710e9669 MD |
2433 | if (base_enabler->event_param.instrumentation == event->instrumentation |
2434 | && lttng_desc_match_enabler(event->desc, base_enabler) > 0 | |
2435 | && event->container == event_enabler->container | |
2436 | && match_event_token(event->container, event, event_enabler->base.user_token)) | |
2437 | return true; | |
3c997079 | 2438 | else |
710e9669 | 2439 | return false; |
3c997079 MD |
2440 | } |
2441 | ||
b01155ba FD |
2442 | static |
2443 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2444 | struct lttng_event_notifier *event_notifier) | |
2445 | { | |
2446 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2447 | event_notifier_enabler); | |
2448 | ||
2449 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
2450 | return 0; | |
710e9669 | 2451 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) > 0 |
b01155ba FD |
2452 | && event_notifier->group == event_notifier_enabler->group |
2453 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2454 | return 1; | |
2455 | else | |
2456 | return 0; | |
2457 | } | |
2458 | ||
3c997079 | 2459 | static |
b2bc0bc8 FD |
2460 | struct lttng_enabler_ref *lttng_enabler_ref( |
2461 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2462 | struct lttng_enabler *enabler) |
2463 | { | |
2464 | struct lttng_enabler_ref *enabler_ref; | |
2465 | ||
b2bc0bc8 | 2466 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2467 | if (enabler_ref->ref == enabler) |
2468 | return enabler_ref; | |
2469 | } | |
2470 | return NULL; | |
2471 | } | |
2472 | ||
3c997079 | 2473 | static |
1b917d6b | 2474 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2475 | { |
3c997079 MD |
2476 | struct lttng_probe_desc *probe_desc; |
2477 | const struct lttng_event_desc *desc; | |
2478 | int i; | |
2479 | struct list_head *probe_list; | |
2480 | ||
2481 | probe_list = lttng_get_probe_list_head(); | |
2482 | /* | |
2483 | * For each probe event, if we find that a probe event matches | |
2484 | * our enabler, create an associated lttng_event if not | |
2485 | * already present. | |
2486 | */ | |
2487 | list_for_each_entry(probe_desc, probe_list, head) { | |
2488 | for (i = 0; i < probe_desc->nr_events; i++) { | |
3c997079 MD |
2489 | struct lttng_event *event; |
2490 | ||
2491 | desc = probe_desc->event_desc[i]; | |
710e9669 MD |
2492 | if (lttng_desc_match_enabler(desc, |
2493 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
3c997079 | 2494 | continue; |
3c997079 | 2495 | |
710e9669 MD |
2496 | /* Try to create an event for this event probe. */ |
2497 | event = _lttng_event_create(event_enabler->container, | |
2498 | NULL, &event_enabler->key, NULL, desc, | |
2499 | LTTNG_KERNEL_TRACEPOINT, | |
2500 | event_enabler->base.user_token); | |
2501 | /* Skip if event is already found. */ | |
2502 | if (IS_ERR(event) && PTR_ERR(event) == -EEXIST) | |
3c997079 | 2503 | continue; |
710e9669 | 2504 | if (IS_ERR(event)) { |
5a15f70c | 2505 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
2506 | probe_desc->event_desc[i]->name); |
2507 | } | |
2508 | } | |
2509 | } | |
2510 | } | |
2511 | ||
b01155ba FD |
2512 | static |
2513 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2514 | { | |
2515 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2516 | struct lttng_probe_desc *probe_desc; | |
2517 | const struct lttng_event_desc *desc; | |
2518 | int i; | |
2519 | struct list_head *probe_list; | |
2520 | ||
2521 | probe_list = lttng_get_probe_list_head(); | |
2522 | /* | |
2523 | * For each probe event, if we find that a probe event matches | |
2524 | * our enabler, create an associated lttng_event_notifier if not | |
2525 | * already present. | |
2526 | */ | |
2527 | list_for_each_entry(probe_desc, probe_list, head) { | |
2528 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2529 | int found = 0; | |
2530 | struct hlist_head *head; | |
2531 | struct lttng_event_notifier *event_notifier; | |
2532 | ||
2533 | desc = probe_desc->event_desc[i]; | |
710e9669 MD |
2534 | if (lttng_desc_match_enabler(desc, |
2535 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)) <= 0) | |
b01155ba FD |
2536 | continue; |
2537 | ||
2538 | /* | |
2539 | * Check if already created. | |
2540 | */ | |
2541 | head = utils_borrow_hash_table_bucket( | |
2542 | event_notifier_group->event_notifiers_ht.table, | |
2543 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
2544 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
2545 | if (event_notifier->desc == desc | |
2546 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2547 | found = 1; | |
2548 | } | |
2549 | if (found) | |
2550 | continue; | |
2551 | ||
2552 | /* | |
2553 | * We need to create a event_notifier for this event probe. | |
2554 | */ | |
2555 | event_notifier = _lttng_event_notifier_create(desc, | |
2556 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2557 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2558 | event_notifier_group, NULL, NULL, |
2559 | LTTNG_KERNEL_TRACEPOINT); | |
2560 | if (IS_ERR(event_notifier)) { | |
2561 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
2562 | probe_desc->event_desc[i]->name); | |
2563 | } | |
2564 | } | |
2565 | } | |
2566 | } | |
2567 | ||
33a39a3c | 2568 | static |
1b917d6b | 2569 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2570 | { |
2571 | int ret; | |
2572 | ||
3b82c4e1 | 2573 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2574 | WARN_ON_ONCE(ret); |
2575 | } | |
2576 | ||
8a8ac9a8 FD |
2577 | static |
2578 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2579 | { | |
2580 | int ret; | |
2581 | ||
2582 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2583 | WARN_ON_ONCE(ret); | |
2584 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2585 | WARN_ON_ONCE(ret); | |
2586 | } | |
2587 | ||
33a39a3c MD |
2588 | /* |
2589 | * Create struct lttng_event if it is missing and present in the list of | |
2590 | * tracepoint probes. | |
2591 | * Should be called with sessions mutex held. | |
2592 | */ | |
2593 | static | |
b2bc0bc8 | 2594 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2595 | { |
b2bc0bc8 | 2596 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2597 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2598 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
2599 | break; |
2600 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 2601 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
2602 | break; |
2603 | default: | |
2604 | WARN_ON_ONCE(1); | |
2605 | break; | |
2606 | } | |
2607 | } | |
2608 | ||
3c997079 | 2609 | /* |
b2bc0bc8 | 2610 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2611 | * and add backward reference from the event to the enabler. |
2612 | * Should be called with sessions mutex held. | |
2613 | */ | |
2614 | static | |
b2bc0bc8 | 2615 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2616 | { |
710e9669 MD |
2617 | struct lttng_event_container *container = event_enabler->container; |
2618 | struct lttng_session *session = container->session; | |
b2bc0bc8 | 2619 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2620 | struct lttng_event *event; |
2621 | ||
b2bc0bc8 | 2622 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2623 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2624 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2625 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2626 | int enabled = base_enabler->enabled; |
2627 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2628 | ||
2629 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
710e9669 | 2630 | WRITE_ONCE(container->syscall_all_entry, enabled); |
3b82c4e1 MD |
2631 | |
2632 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
710e9669 | 2633 | WRITE_ONCE(container->syscall_all_exit, enabled); |
badfe9f5 MD |
2634 | } |
2635 | ||
3c997079 | 2636 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2637 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2638 | |
b2bc0bc8 | 2639 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2640 | list_for_each_entry(event, &session->events, list) { |
2641 | struct lttng_enabler_ref *enabler_ref; | |
2642 | ||
b2bc0bc8 | 2643 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2644 | continue; |
b2bc0bc8 FD |
2645 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2646 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2647 | if (!enabler_ref) { |
2648 | /* | |
2649 | * If no backward ref, create it. | |
b2bc0bc8 | 2650 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2651 | */ |
2652 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2653 | if (!enabler_ref) | |
2654 | return -ENOMEM; | |
b2bc0bc8 | 2655 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2656 | list_add(&enabler_ref->node, |
2657 | &event->enablers_ref_head); | |
710e9669 MD |
2658 | /* Append descriptor to counter. */ |
2659 | switch (container->type) { | |
2660 | case LTTNG_EVENT_CONTAINER_COUNTER: | |
2661 | { | |
2662 | struct lttng_counter *counter; | |
2663 | const char *name = "<UNKNOWN>"; | |
2664 | int ret; | |
2665 | ||
2666 | counter = lttng_event_container_get_counter(container); | |
2667 | if (event->key[0]) | |
2668 | name = event->key; | |
2669 | else if (event->desc && event->desc->name) | |
2670 | name = event->desc->name; | |
2671 | ret = lttng_counter_append_descriptor(counter, | |
2672 | event_enabler->base.user_token, event->id, | |
2673 | name); | |
2674 | if (ret) { | |
2675 | WARN_ON_ONCE(1); | |
2676 | return ret; | |
2677 | } | |
2678 | break; | |
2679 | } | |
2680 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
2681 | default: | |
2682 | break; | |
2683 | } | |
3c997079 MD |
2684 | } |
2685 | ||
f127e61e MD |
2686 | /* |
2687 | * Link filter bytecodes if not linked yet. | |
2688 | */ | |
2dfda770 FD |
2689 | lttng_enabler_link_bytecode(event->desc, |
2690 | lttng_static_ctx, | |
183e8b3a | 2691 | &event->filter_bytecode_runtime_head, |
60206944 | 2692 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2693 | |
3c997079 MD |
2694 | /* TODO: merge event context. */ |
2695 | } | |
2696 | return 0; | |
2697 | } | |
2698 | ||
b01155ba FD |
2699 | /* |
2700 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2701 | * tracepoint probes. | |
2702 | * Should be called with sessions mutex held. | |
2703 | */ | |
2704 | static | |
2705 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2706 | { | |
2707 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2708 | case LTTNG_KERNEL_TRACEPOINT: | |
2709 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2710 | break; | |
8a8ac9a8 FD |
2711 | case LTTNG_KERNEL_SYSCALL: |
2712 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2713 | break; | |
b01155ba FD |
2714 | default: |
2715 | WARN_ON_ONCE(1); | |
2716 | break; | |
2717 | } | |
2718 | } | |
2719 | ||
2720 | /* | |
2721 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2722 | */ | |
2723 | static | |
8a8ac9a8 FD |
2724 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2725 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2726 | { |
2727 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2728 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2729 | struct lttng_event_notifier *event_notifier; |
2730 | ||
8a8ac9a8 FD |
2731 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2732 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2733 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2734 | !strcmp(base_enabler->event_param.name, "*")) { | |
2735 | ||
2736 | int enabled = base_enabler->enabled; | |
2737 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2738 | ||
2739 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2740 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2741 | ||
2742 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2743 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2744 | ||
2745 | } | |
2746 | ||
b01155ba FD |
2747 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2748 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2749 | ||
2750 | /* Link the created event_notifier with its associated enabler. */ | |
2751 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2752 | struct lttng_enabler_ref *enabler_ref; | |
2753 | ||
2754 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2755 | continue; | |
2756 | ||
2757 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2758 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2759 | if (!enabler_ref) { | |
2760 | /* | |
2761 | * If no backward ref, create it. | |
2762 | * Add backward ref from event_notifier to enabler. | |
2763 | */ | |
2764 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2765 | if (!enabler_ref) | |
2766 | return -ENOMEM; | |
2767 | ||
2768 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2769 | event_notifier_enabler); | |
2770 | list_add(&enabler_ref->node, | |
2771 | &event_notifier->enablers_ref_head); | |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * Link filter bytecodes if not linked yet. | |
2776 | */ | |
2777 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2778 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2779 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2780 | |
2781 | /* Link capture bytecodes if not linked yet. */ | |
2782 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2783 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2784 | &event_notifier_enabler->capture_bytecode_head); | |
2785 | ||
2786 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2787 | } |
2788 | return 0; | |
2789 | } | |
2790 | ||
3c997079 MD |
2791 | /* |
2792 | * Called at module load: connect the probe on all enablers matching | |
2793 | * this event. | |
2794 | * Called with sessions lock held. | |
2795 | */ | |
2796 | int lttng_fix_pending_events(void) | |
2797 | { | |
2798 | struct lttng_session *session; | |
2799 | ||
2800 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2801 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2802 | return 0; |
2803 | } | |
2804 | ||
b01155ba FD |
2805 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2806 | struct lttng_event_notifier_group *event_notifier_group) | |
2807 | { | |
2808 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2809 | ||
2810 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2811 | node) { | |
2812 | if (event_notifier_enabler->base.enabled) | |
2813 | return true; | |
2814 | } | |
2815 | return false; | |
2816 | } | |
2817 | ||
2818 | bool lttng_event_notifier_active(void) | |
2819 | { | |
2820 | struct lttng_event_notifier_group *event_notifier_group; | |
2821 | ||
2822 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2823 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2824 | return true; | |
2825 | } | |
2826 | return false; | |
2827 | } | |
2828 | ||
2829 | int lttng_fix_pending_event_notifiers(void) | |
2830 | { | |
2831 | struct lttng_event_notifier_group *event_notifier_group; | |
2832 | ||
2833 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2834 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2835 | return 0; | |
2836 | } | |
2837 | ||
b2bc0bc8 FD |
2838 | struct lttng_event_enabler *lttng_event_enabler_create( |
2839 | enum lttng_enabler_format_type format_type, | |
3c997079 | 2840 | struct lttng_kernel_event *event_param, |
710e9669 MD |
2841 | const struct lttng_counter_key *key, |
2842 | struct lttng_event_container *container) | |
3c997079 | 2843 | { |
b2bc0bc8 | 2844 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2845 | |
b2bc0bc8 FD |
2846 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2847 | if (!event_enabler) | |
3c997079 | 2848 | return NULL; |
b2bc0bc8 FD |
2849 | event_enabler->base.format_type = format_type; |
2850 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2851 | memcpy(&event_enabler->base.event_param, event_param, | |
2852 | sizeof(event_enabler->base.event_param)); | |
710e9669 | 2853 | event_enabler->container = container; |
3c997079 | 2854 | /* ctx left NULL */ |
b2bc0bc8 FD |
2855 | event_enabler->base.enabled = 0; |
2856 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
710e9669 MD |
2857 | event_enabler->base.user_token = event_param->token; |
2858 | if (key) | |
2859 | event_enabler->key = *key; | |
3c997079 | 2860 | mutex_lock(&sessions_mutex); |
710e9669 MD |
2861 | list_add(&event_enabler->node, &event_enabler->container->session->enablers_head); |
2862 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); | |
3c997079 | 2863 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2864 | return event_enabler; |
3c997079 MD |
2865 | } |
2866 | ||
b2bc0bc8 | 2867 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2868 | { |
2869 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2870 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
710e9669 | 2871 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
3c997079 MD |
2872 | mutex_unlock(&sessions_mutex); |
2873 | return 0; | |
2874 | } | |
2875 | ||
b2bc0bc8 | 2876 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2877 | { |
2878 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2879 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
710e9669 | 2880 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
3c997079 MD |
2881 | mutex_unlock(&sessions_mutex); |
2882 | return 0; | |
2883 | } | |
2884 | ||
b2bc0bc8 | 2885 | static |
183e8b3a | 2886 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2887 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2888 | { | |
89ec2b91 | 2889 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2890 | uint32_t bytecode_len; |
2891 | int ret; | |
2892 | ||
2893 | ret = get_user(bytecode_len, &bytecode->len); | |
2894 | if (ret) | |
2895 | return ret; | |
52cfcdf3 | 2896 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2897 | GFP_KERNEL); |
2898 | if (!bytecode_node) | |
2899 | return -ENOMEM; | |
2900 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2901 | sizeof(*bytecode) + bytecode_len); | |
2902 | if (ret) | |
2903 | goto error_free; | |
b2bc0bc8 | 2904 | |
89ec2b91 | 2905 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2906 | bytecode_node->enabler = enabler; |
2907 | /* Enforce length based on allocated size */ | |
2908 | bytecode_node->bc.len = bytecode_len; | |
2909 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2910 | |
07dfc1d0 MD |
2911 | return 0; |
2912 | ||
2913 | error_free: | |
52cfcdf3 | 2914 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2915 | return ret; |
2916 | } | |
2917 | ||
183e8b3a | 2918 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2919 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2920 | { | |
2921 | int ret; | |
183e8b3a | 2922 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2923 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2924 | if (ret) | |
2925 | goto error; | |
2926 | ||
710e9669 | 2927 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
b2bc0bc8 FD |
2928 | return 0; |
2929 | ||
2930 | error: | |
2931 | return ret; | |
2932 | } | |
2933 | ||
3aed4dca FD |
2934 | int lttng_event_add_callsite(struct lttng_event *event, |
2935 | struct lttng_kernel_event_callsite __user *callsite) | |
2936 | { | |
2937 | ||
2938 | switch (event->instrumentation) { | |
2939 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2940 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2941 | default: |
2942 | return -EINVAL; | |
2943 | } | |
2944 | } | |
2945 | ||
b2bc0bc8 | 2946 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2947 | struct lttng_kernel_context *context_param) |
2948 | { | |
2949 | return -ENOSYS; | |
2950 | } | |
2951 | ||
2952 | static | |
2953 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2954 | { | |
89ec2b91 | 2955 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2956 | |
2957 | /* Destroy filter bytecode */ | |
2958 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2959 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2960 | lttng_kvfree(filter_node); |
07dfc1d0 | 2961 | } |
b2bc0bc8 FD |
2962 | } |
2963 | ||
2964 | static | |
2965 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2966 | { | |
2967 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2968 | |
3c997079 | 2969 | /* Destroy contexts */ |
b2bc0bc8 | 2970 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2971 | |
b2bc0bc8 FD |
2972 | list_del(&event_enabler->node); |
2973 | kfree(event_enabler); | |
3c997079 MD |
2974 | } |
2975 | ||
dffef45d FD |
2976 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2977 | struct lttng_event_notifier_group *event_notifier_group, | |
2978 | enum lttng_enabler_format_type format_type, | |
2979 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2980 | { | |
2981 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2982 | ||
2983 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2984 | if (!event_notifier_enabler) | |
2985 | return NULL; | |
2986 | ||
2987 | event_notifier_enabler->base.format_type = format_type; | |
2988 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2989 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2990 | ||
99f52fcc | 2991 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2992 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2993 | |
8a8ac9a8 FD |
2994 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2995 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2996 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2997 | ||
2998 | event_notifier_enabler->base.enabled = 0; | |
2999 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
3000 | event_notifier_enabler->group = event_notifier_group; | |
3001 | ||
3002 | mutex_lock(&sessions_mutex); | |
3003 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 3004 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
3005 | |
3006 | mutex_unlock(&sessions_mutex); | |
3007 | ||
3008 | return event_notifier_enabler; | |
3009 | } | |
3010 | ||
3011 | int lttng_event_notifier_enabler_enable( | |
3012 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
3013 | { | |
3014 | mutex_lock(&sessions_mutex); | |
3015 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 3016 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
3017 | mutex_unlock(&sessions_mutex); |
3018 | return 0; | |
3019 | } | |
3020 | ||
3021 | int lttng_event_notifier_enabler_disable( | |
3022 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
3023 | { | |
3024 | mutex_lock(&sessions_mutex); | |
3025 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 3026 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
3027 | mutex_unlock(&sessions_mutex); |
3028 | return 0; | |
3029 | } | |
3030 | ||
183e8b3a | 3031 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
3032 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
3033 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
3034 | { | |
3035 | int ret; | |
3036 | ||
183e8b3a | 3037 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
3038 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
3039 | bytecode); | |
3040 | if (ret) | |
3041 | goto error; | |
3042 | ||
b01155ba | 3043 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
3044 | return 0; |
3045 | ||
3046 | error: | |
3047 | return ret; | |
3048 | } | |
3049 | ||
99d223ad FD |
3050 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
3051 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
3052 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
3053 | { | |
3054 | struct lttng_bytecode_node *bytecode_node; | |
3055 | struct lttng_enabler *enabler = | |
3056 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
3057 | uint32_t bytecode_len; | |
3058 | int ret; | |
3059 | ||
3060 | ret = get_user(bytecode_len, &bytecode->len); | |
3061 | if (ret) | |
3062 | return ret; | |
3063 | ||
3064 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
3065 | GFP_KERNEL); | |
3066 | if (!bytecode_node) | |
3067 | return -ENOMEM; | |
3068 | ||
3069 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
3070 | sizeof(*bytecode) + bytecode_len); | |
3071 | if (ret) | |
3072 | goto error_free; | |
3073 | ||
3074 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
3075 | bytecode_node->enabler = enabler; | |
3076 | ||
3077 | /* Enforce length based on allocated size */ | |
3078 | bytecode_node->bc.len = bytecode_len; | |
3079 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
3080 | ||
3081 | event_notifier_enabler->num_captures++; | |
3082 | ||
3083 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
3084 | goto end; | |
3085 | ||
3086 | error_free: | |
3087 | lttng_kvfree(bytecode_node); | |
3088 | end: | |
3089 | return ret; | |
3090 | } | |
3091 | ||
9de67196 FD |
3092 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
3093 | struct lttng_kernel_event_callsite __user *callsite) | |
3094 | { | |
3095 | ||
3096 | switch (event_notifier->instrumentation) { | |
3097 | case LTTNG_KERNEL_UPROBE: | |
3098 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
3099 | callsite); | |
3100 | default: | |
3101 | return -EINVAL; | |
3102 | } | |
3103 | } | |
3104 | ||
dffef45d FD |
3105 | int lttng_event_notifier_enabler_attach_context( |
3106 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
3107 | struct lttng_kernel_context *context_param) | |
3108 | { | |
3109 | return -ENOSYS; | |
3110 | } | |
3111 | ||
3112 | static | |
3113 | void lttng_event_notifier_enabler_destroy( | |
3114 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
3115 | { | |
3116 | if (!event_notifier_enabler) { | |
3117 | return; | |
3118 | } | |
3119 | ||
3120 | list_del(&event_notifier_enabler->node); | |
3121 | ||
3122 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
3123 | kfree(event_notifier_enabler); | |
3124 | } | |
3125 | ||
3c997079 | 3126 | /* |
b2bc0bc8 | 3127 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
3128 | * session. |
3129 | * Should be called with sessions mutex held. | |
3130 | */ | |
3131 | static | |
b2bc0bc8 | 3132 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 3133 | { |
b2bc0bc8 | 3134 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
3135 | struct lttng_event *event; |
3136 | ||
b2bc0bc8 FD |
3137 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
3138 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
3139 | /* |
3140 | * For each event, if at least one of its enablers is enabled, | |
710e9669 | 3141 | * and its event container and session transient states are enabled, we |
3c997079 MD |
3142 | * enable the event, else we disable it. |
3143 | */ | |
3144 | list_for_each_entry(event, &session->events, list) { | |
3145 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
3146 | struct lttng_bytecode_runtime *runtime; |
3147 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 3148 | |
4ecb5ad5 MD |
3149 | switch (event->instrumentation) { |
3150 | case LTTNG_KERNEL_TRACEPOINT: | |
3151 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
3152 | /* Enable events */ |
3153 | list_for_each_entry(enabler_ref, | |
3154 | &event->enablers_ref_head, node) { | |
3155 | if (enabler_ref->ref->enabled) { | |
3156 | enabled = 1; | |
3157 | break; | |
3158 | } | |
3159 | } | |
4ecb5ad5 MD |
3160 | break; |
3161 | default: | |
3c997079 MD |
3162 | /* Not handled with lazy sync. */ |
3163 | continue; | |
3164 | } | |
3165 | /* | |
3166 | * Enabled state is based on union of enablers, with | |
710e9669 | 3167 | * intesection of session and event container transient enable |
3c997079 MD |
3168 | * states. |
3169 | */ | |
710e9669 | 3170 | enabled = enabled && session->tstate && event->container->tstate; |
3c997079 | 3171 | |
a8f2d0c7 | 3172 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
3173 | /* |
3174 | * Sync tracepoint registration with event enabled | |
3175 | * state. | |
3176 | */ | |
3177 | if (enabled) { | |
3178 | register_event(event); | |
3179 | } else { | |
3180 | _lttng_event_unregister(event); | |
3181 | } | |
07dfc1d0 MD |
3182 | |
3183 | /* Check if has enablers without bytecode enabled */ | |
3184 | list_for_each_entry(enabler_ref, | |
3185 | &event->enablers_ref_head, node) { | |
3186 | if (enabler_ref->ref->enabled | |
3187 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
3188 | has_enablers_without_bytecode = 1; | |
3189 | break; | |
3190 | } | |
3191 | } | |
3192 | event->has_enablers_without_bytecode = | |
3193 | has_enablers_without_bytecode; | |
3194 | ||
3195 | /* Enable filters */ | |
3196 | list_for_each_entry(runtime, | |
183e8b3a | 3197 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 3198 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
3199 | } |
3200 | } | |
3201 | ||
3202 | /* | |
3203 | * Apply enablers to session events, adding events to session if need | |
3204 | * be. It is required after each modification applied to an active | |
3205 | * session, and right before session "start". | |
3206 | * "lazy" sync means we only sync if required. | |
3207 | * Should be called with sessions mutex held. | |
3208 | */ | |
3209 | static | |
b2bc0bc8 | 3210 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
3211 | { |
3212 | /* We can skip if session is not active */ | |
3213 | if (!session->active) | |
3214 | return; | |
b2bc0bc8 | 3215 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
3216 | } |
3217 | ||
b01155ba FD |
3218 | static |
3219 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
3220 | { | |
3221 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
3222 | struct lttng_event_notifier *event_notifier; | |
3223 | ||
3224 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
3225 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
3226 | ||
3227 | /* | |
3228 | * For each event_notifier, if at least one of its enablers is enabled, | |
3229 | * we enable the event_notifier, else we disable it. | |
3230 | */ | |
3231 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
3232 | struct lttng_enabler_ref *enabler_ref; | |
3233 | struct lttng_bytecode_runtime *runtime; | |
3234 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3235 | ||
3236 | switch (event_notifier->instrumentation) { | |
3237 | case LTTNG_KERNEL_TRACEPOINT: | |
3238 | case LTTNG_KERNEL_SYSCALL: | |
3239 | /* Enable event_notifiers */ | |
3240 | list_for_each_entry(enabler_ref, | |
3241 | &event_notifier->enablers_ref_head, node) { | |
3242 | if (enabler_ref->ref->enabled) { | |
3243 | enabled = 1; | |
3244 | break; | |
3245 | } | |
3246 | } | |
3247 | break; | |
3248 | default: | |
3249 | /* Not handled with sync. */ | |
3250 | continue; | |
3251 | } | |
3252 | ||
3253 | WRITE_ONCE(event_notifier->enabled, enabled); | |
3254 | /* | |
3255 | * Sync tracepoint registration with event_notifier enabled | |
3256 | * state. | |
3257 | */ | |
3258 | if (enabled) { | |
3259 | if (!event_notifier->registered) | |
3260 | register_event_notifier(event_notifier); | |
3261 | } else { | |
3262 | if (event_notifier->registered) | |
3263 | _lttng_event_notifier_unregister(event_notifier); | |
3264 | } | |
3265 | ||
3266 | /* Check if has enablers without bytecode enabled */ | |
3267 | list_for_each_entry(enabler_ref, | |
3268 | &event_notifier->enablers_ref_head, node) { | |
3269 | if (enabler_ref->ref->enabled | |
3270 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
3271 | has_enablers_without_bytecode = 1; | |
3272 | break; | |
3273 | } | |
3274 | } | |
3275 | event_notifier->has_enablers_without_bytecode = | |
3276 | has_enablers_without_bytecode; | |
3277 | ||
3278 | /* Enable filters */ | |
3279 | list_for_each_entry(runtime, | |
183e8b3a | 3280 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 3281 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
3282 | |
3283 | /* Enable captures */ | |
3284 | list_for_each_entry(runtime, | |
3285 | &event_notifier->capture_bytecode_runtime_head, node) | |
3286 | lttng_bytecode_capture_sync_state(runtime); | |
710e9669 MD |
3287 | |
3288 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier->num_captures); | |
b01155ba FD |
3289 | } |
3290 | } | |
3291 | ||
1ec3f75a | 3292 | /* |
d83004aa JD |
3293 | * Serialize at most one packet worth of metadata into a metadata |
3294 | * channel. | |
92d9f5e6 MD |
3295 | * We grab the metadata cache mutex to get exclusive access to our metadata |
3296 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
3297 | * allows us to do racy operations such as looking for remaining space left in | |
3298 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
3299 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
3300 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
3301 | * Returns the number of bytes written in the channel, 0 if no data |
3302 | * was written and a negative value on error. | |
1ec3f75a | 3303 | */ |
b3b8072b | 3304 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 3305 | struct channel *chan, bool *coherent) |
d83004aa JD |
3306 | { |
3307 | struct lib_ring_buffer_ctx ctx; | |
3308 | int ret = 0; | |
3309 | size_t len, reserve_len; | |
3310 | ||
f613e3e6 | 3311 | /* |
92d9f5e6 MD |
3312 | * Ensure we support mutiple get_next / put sequences followed by |
3313 | * put_next. The metadata cache lock protects reading the metadata | |
3314 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
3315 | * "flush" operations on the buffer invoked by different processes. | |
3316 | * Moreover, since the metadata cache memory can be reallocated, we | |
3317 | * need to have exclusive access against updates even though we only | |
3318 | * read it. | |
f613e3e6 | 3319 | */ |
92d9f5e6 | 3320 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
3321 | WARN_ON(stream->metadata_in < stream->metadata_out); |
3322 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 3323 | goto end; |
f613e3e6 | 3324 | |
9616f0bf JD |
3325 | /* Metadata regenerated, change the version. */ |
3326 | if (stream->metadata_cache->version != stream->version) | |
3327 | stream->version = stream->metadata_cache->version; | |
3328 | ||
d83004aa | 3329 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 3330 | stream->metadata_in; |
9de2c215 | 3331 | if (!len) |
de23d59d | 3332 | goto end; |
d83004aa | 3333 | reserve_len = min_t(size_t, |
b3b8072b | 3334 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 3335 | len); |
b3b8072b | 3336 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
3337 | sizeof(char), -1); |
3338 | /* | |
3339 | * If reservation failed, return an error to the caller. | |
3340 | */ | |
b3b8072b | 3341 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
3342 | if (ret != 0) { |
3343 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 3344 | stream->coherent = false; |
d83004aa JD |
3345 | goto end; |
3346 | } | |
b3b8072b | 3347 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 3348 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 3349 | reserve_len); |
b3b8072b | 3350 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 3351 | stream->metadata_in += reserve_len; |
3e75e2a7 | 3352 | if (reserve_len < len) |
8b97fd42 MD |
3353 | stream->coherent = false; |
3354 | else | |
3355 | stream->coherent = true; | |
d83004aa JD |
3356 | ret = reserve_len; |
3357 | ||
3358 | end: | |
8b97fd42 MD |
3359 | if (coherent) |
3360 | *coherent = stream->coherent; | |
92d9f5e6 | 3361 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
3362 | return ret; |
3363 | } | |
3364 | ||
8b97fd42 MD |
3365 | static |
3366 | void lttng_metadata_begin(struct lttng_session *session) | |
3367 | { | |
3e75e2a7 MD |
3368 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
3369 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
3370 | } |
3371 | ||
3372 | static | |
3373 | void lttng_metadata_end(struct lttng_session *session) | |
3374 | { | |
3e75e2a7 MD |
3375 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
3376 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
3377 | struct lttng_metadata_stream *stream; | |
3378 | ||
3e75e2a7 MD |
3379 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
3380 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 3381 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 3382 | } |
8b97fd42 MD |
3383 | } |
3384 | ||
d83004aa JD |
3385 | /* |
3386 | * Write the metadata to the metadata cache. | |
3387 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3388 | * The metadata cache lock protects us from concurrent read access from |
3389 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3390 | * The content of the printf is printed as a single atomic metadata |
3391 | * transaction. | |
d83004aa | 3392 | */ |
a90917c3 | 3393 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
3394 | const char *fmt, ...) |
3395 | { | |
c099397a | 3396 | char *str; |
d83004aa | 3397 | size_t len; |
c099397a MD |
3398 | va_list ap; |
3399 | ||
585e5dcc | 3400 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3401 | |
3402 | va_start(ap, fmt); | |
3403 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3404 | va_end(ap); | |
3405 | if (!str) | |
3406 | return -ENOMEM; | |
3407 | ||
1ec3f75a | 3408 | len = strlen(str); |
3e75e2a7 | 3409 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
3410 | if (session->metadata_cache->metadata_written + len > |
3411 | session->metadata_cache->cache_alloc) { | |
3412 | char *tmp_cache_realloc; | |
3413 | unsigned int tmp_cache_alloc_size; | |
3414 | ||
3415 | tmp_cache_alloc_size = max_t(unsigned int, | |
3416 | session->metadata_cache->cache_alloc + len, | |
3417 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3418 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3419 | if (!tmp_cache_realloc) |
3420 | goto err; | |
a606b6e8 ML |
3421 | if (session->metadata_cache->data) { |
3422 | memcpy(tmp_cache_realloc, | |
3423 | session->metadata_cache->data, | |
3424 | session->metadata_cache->cache_alloc); | |
3425 | vfree(session->metadata_cache->data); | |
3426 | } | |
3427 | ||
d83004aa JD |
3428 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3429 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3430 | } |
d83004aa JD |
3431 | memcpy(session->metadata_cache->data + |
3432 | session->metadata_cache->metadata_written, | |
3433 | str, len); | |
3434 | session->metadata_cache->metadata_written += len; | |
c099397a | 3435 | kfree(str); |
d83004aa | 3436 | |
d83004aa JD |
3437 | return 0; |
3438 | ||
3439 | err: | |
3440 | kfree(str); | |
3441 | return -ENOMEM; | |
c099397a MD |
3442 | } |
3443 | ||
f513b2bf MD |
3444 | static |
3445 | int print_tabs(struct lttng_session *session, size_t nesting) | |
3446 | { | |
3447 | size_t i; | |
3448 | ||
3449 | for (i = 0; i < nesting; i++) { | |
3450 | int ret; | |
3451 | ||
3452 | ret = lttng_metadata_printf(session, " "); | |
3453 | if (ret) { | |
3454 | return ret; | |
3455 | } | |
3456 | } | |
3457 | return 0; | |
3458 | } | |
3459 | ||
ceabb767 MD |
3460 | static |
3461 | int lttng_field_name_statedump(struct lttng_session *session, | |
3462 | const struct lttng_event_field *field, | |
3463 | size_t nesting) | |
3464 | { | |
3465 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3466 | } | |
3467 | ||
3468 | static | |
3469 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
3470 | const struct lttng_type *type, | |
3471 | size_t nesting) | |
3472 | { | |
3473 | int ret; | |
3474 | ||
3475 | WARN_ON_ONCE(type->atype != atype_integer); | |
3476 | ret = print_tabs(session, nesting); | |
3477 | if (ret) | |
3478 | return ret; | |
3479 | ret = lttng_metadata_printf(session, | |
3480 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
3481 | type->u.integer.size, | |
3482 | type->u.integer.alignment, | |
3483 | type->u.integer.signedness, | |
3484 | (type->u.integer.encoding == lttng_encode_none) | |
3485 | ? "none" | |
3486 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
3487 | ? "UTF8" | |
3488 | : "ASCII", | |
3489 | type->u.integer.base, | |
3490 | #if __BYTE_ORDER == __BIG_ENDIAN | |
3491 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
3492 | #else | |
3493 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
3494 | #endif | |
3495 | ); | |
3496 | return ret; | |
3497 | } | |
3498 | ||
f513b2bf MD |
3499 | /* |
3500 | * Must be called with sessions_mutex held. | |
3501 | */ | |
3502 | static | |
3503 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
3504 | const struct lttng_type *type, | |
3505 | size_t nesting) | |
3506 | { | |
3507 | int ret; | |
3508 | uint32_t i, nr_fields; | |
ceabb767 MD |
3509 | unsigned int alignment; |
3510 | ||
3511 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
3512 | |
3513 | ret = print_tabs(session, nesting); | |
3514 | if (ret) | |
3515 | return ret; | |
3516 | ret = lttng_metadata_printf(session, | |
3517 | "struct {\n"); | |
3518 | if (ret) | |
3519 | return ret; | |
ceabb767 | 3520 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
3521 | for (i = 0; i < nr_fields; i++) { |
3522 | const struct lttng_event_field *iter_field; | |
3523 | ||
ceabb767 | 3524 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
3525 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3526 | if (ret) | |
3527 | return ret; | |
3528 | } | |
3529 | ret = print_tabs(session, nesting); | |
3530 | if (ret) | |
3531 | return ret; | |
ceabb767 MD |
3532 | alignment = type->u.struct_nestable.alignment; |
3533 | if (alignment) { | |
3534 | ret = lttng_metadata_printf(session, | |
3535 | "} align(%u)", | |
3536 | alignment); | |
3537 | } else { | |
3538 | ret = lttng_metadata_printf(session, | |
3539 | "}"); | |
3540 | } | |
f513b2bf MD |
3541 | return ret; |
3542 | } | |
3543 | ||
3544 | /* | |
3545 | * Must be called with sessions_mutex held. | |
3546 | */ | |
3547 | static | |
ceabb767 | 3548 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3549 | const struct lttng_event_field *field, |
3550 | size_t nesting) | |
3551 | { | |
3552 | int ret; | |
3553 | ||
3554 | ret = _lttng_struct_type_statedump(session, | |
3555 | &field->type, nesting); | |
3556 | if (ret) | |
3557 | return ret; | |
ceabb767 | 3558 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3559 | } |
3560 | ||
65c85aa6 MD |
3561 | /* |
3562 | * Must be called with sessions_mutex held. | |
3563 | */ | |
3564 | static | |
3565 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
3566 | const struct lttng_type *type, | |
3567 | size_t nesting) | |
3568 | { | |
3569 | int ret; | |
3570 | uint32_t i, nr_choices; | |
3571 | ||
ceabb767 MD |
3572 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
3573 | /* | |
3574 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3575 | */ | |
3576 | if (type->u.variant_nestable.alignment != 0) | |
3577 | return -EINVAL; | |
65c85aa6 MD |
3578 | ret = print_tabs(session, nesting); |
3579 | if (ret) | |
3580 | return ret; | |
3581 | ret = lttng_metadata_printf(session, | |
3582 | "variant <_%s> {\n", | |
ceabb767 | 3583 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
3584 | if (ret) |
3585 | return ret; | |
ceabb767 | 3586 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
3587 | for (i = 0; i < nr_choices; i++) { |
3588 | const struct lttng_event_field *iter_field; | |
3589 | ||
ceabb767 | 3590 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
3591 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3592 | if (ret) | |
3593 | return ret; | |
3594 | } | |
3595 | ret = print_tabs(session, nesting); | |
3596 | if (ret) | |
3597 | return ret; | |
3598 | ret = lttng_metadata_printf(session, | |
3599 | "}"); | |
3600 | return ret; | |
3601 | } | |
3602 | ||
3603 | /* | |
3604 | * Must be called with sessions_mutex held. | |
3605 | */ | |
3606 | static | |
ceabb767 | 3607 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3608 | const struct lttng_event_field *field, |
3609 | size_t nesting) | |
3610 | { | |
3611 | int ret; | |
3612 | ||
3613 | ret = _lttng_variant_type_statedump(session, | |
3614 | &field->type, nesting); | |
3615 | if (ret) | |
3616 | return ret; | |
ceabb767 | 3617 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3618 | } |
3619 | ||
f513b2bf MD |
3620 | /* |
3621 | * Must be called with sessions_mutex held. | |
3622 | */ | |
3623 | static | |
ceabb767 | 3624 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3625 | const struct lttng_event_field *field, |
3626 | size_t nesting) | |
3627 | { | |
3628 | int ret; | |
3629 | const struct lttng_type *elem_type; | |
3630 | ||
ceabb767 MD |
3631 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
3632 | ||
3633 | if (field->type.u.array_nestable.alignment) { | |
3634 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3635 | if (ret) |
3636 | return ret; | |
ceabb767 MD |
3637 | ret = lttng_metadata_printf(session, |
3638 | "struct { } align(%u) _%s_padding;\n", | |
3639 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3640 | field->name); | |
3641 | if (ret) | |
3642 | return ret; | |
3643 | } | |
3644 | /* | |
3645 | * Nested compound types: Only array of structures and variants are | |
3646 | * currently supported. | |
3647 | */ | |
3648 | elem_type = field->type.u.array_nestable.elem_type; | |
3649 | switch (elem_type->atype) { | |
3650 | case atype_integer: | |
3651 | case atype_struct_nestable: | |
3652 | case atype_variant_nestable: | |
3653 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3654 | if (ret) |
3655 | return ret; | |
3656 | break; | |
ceabb767 | 3657 | |
f513b2bf MD |
3658 | default: |
3659 | return -EINVAL; | |
3660 | } | |
3661 | ret = lttng_metadata_printf(session, | |
3662 | " _%s[%u];\n", | |
3663 | field->name, | |
ceabb767 | 3664 | field->type.u.array_nestable.length); |
f513b2bf MD |
3665 | return ret; |
3666 | } | |
3667 | ||
3668 | /* | |
3669 | * Must be called with sessions_mutex held. | |
3670 | */ | |
3671 | static | |
ceabb767 | 3672 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3673 | const struct lttng_event_field *field, |
3674 | size_t nesting) | |
3675 | { | |
3676 | int ret; | |
3677 | const char *length_name; | |
3678 | const struct lttng_type *elem_type; | |
3679 | ||
ceabb767 | 3680 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3681 | |
ceabb767 MD |
3682 | length_name = field->type.u.sequence_nestable.length_name; |
3683 | ||
3684 | if (field->type.u.sequence_nestable.alignment) { | |
3685 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3686 | if (ret) |
3687 | return ret; | |
ceabb767 MD |
3688 | ret = lttng_metadata_printf(session, |
3689 | "struct { } align(%u) _%s_padding;\n", | |
3690 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3691 | field->name); | |
3692 | if (ret) | |
3693 | return ret; | |
3694 | } | |
3695 | ||
3696 | /* | |
3697 | * Nested compound types: Only array of structures and variants are | |
3698 | * currently supported. | |
3699 | */ | |
3700 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3701 | switch (elem_type->atype) { | |
3702 | case atype_integer: | |
3703 | case atype_struct_nestable: | |
3704 | case atype_variant_nestable: | |
3705 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3706 | if (ret) |
3707 | return ret; | |
3708 | break; | |
ceabb767 | 3709 | |
f513b2bf MD |
3710 | default: |
3711 | return -EINVAL; | |
3712 | } | |
3713 | ret = lttng_metadata_printf(session, | |
3714 | " _%s[ _%s ];\n", | |
3715 | field->name, | |
ceabb767 | 3716 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3717 | return ret; |
3718 | } | |
3719 | ||
141ddf28 MD |
3720 | /* |
3721 | * Must be called with sessions_mutex held. | |
3722 | */ | |
3723 | static | |
ceabb767 MD |
3724 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3725 | const struct lttng_type *type, | |
141ddf28 MD |
3726 | size_t nesting) |
3727 | { | |
3728 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3729 | const struct lttng_type *container_type; |
141ddf28 MD |
3730 | int ret; |
3731 | unsigned int i, nr_entries; | |
3732 | ||
ceabb767 MD |
3733 | container_type = type->u.enum_nestable.container_type; |
3734 | if (container_type->atype != atype_integer) { | |
3735 | ret = -EINVAL; | |
3736 | goto end; | |
3737 | } | |
3738 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3739 | nr_entries = enum_desc->nr_entries; |
3740 | ||
3741 | ret = print_tabs(session, nesting); | |
3742 | if (ret) | |
3743 | goto end; | |
ceabb767 MD |
3744 | ret = lttng_metadata_printf(session, "enum : "); |
3745 | if (ret) | |
3746 | goto end; | |
3747 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3748 | if (ret) |
ceabb767 MD |
3749 | goto end; |
3750 | ret = lttng_metadata_printf(session, " {\n"); | |
3751 | if (ret) | |
3752 | goto end; | |
141ddf28 MD |
3753 | /* Dump all entries */ |
3754 | for (i = 0; i < nr_entries; i++) { | |
3755 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3756 | int j, len; | |
3757 | ||
3758 | ret = print_tabs(session, nesting + 1); | |
3759 | if (ret) | |
3760 | goto end; | |
3761 | ret = lttng_metadata_printf(session, | |
3762 | "\""); | |
3763 | if (ret) | |
3764 | goto end; | |
3765 | len = strlen(entry->string); | |
3766 | /* Escape the character '"' */ | |
3767 | for (j = 0; j < len; j++) { | |
3768 | char c = entry->string[j]; | |
3769 | ||
3770 | switch (c) { | |
3771 | case '"': | |
3772 | ret = lttng_metadata_printf(session, | |
3773 | "\\\""); | |
3774 | break; | |
3775 | case '\\': | |
3776 | ret = lttng_metadata_printf(session, | |
3777 | "\\\\"); | |
3778 | break; | |
3779 | default: | |
3780 | ret = lttng_metadata_printf(session, | |
3781 | "%c", c); | |
3782 | break; | |
3783 | } | |
3784 | if (ret) | |
3785 | goto end; | |
3786 | } | |
08ad1061 PP |
3787 | ret = lttng_metadata_printf(session, "\""); |
3788 | if (ret) | |
3789 | goto end; | |
3790 | ||
3791 | if (entry->options.is_auto) { | |
3792 | ret = lttng_metadata_printf(session, ",\n"); | |
3793 | if (ret) | |
3794 | goto end; | |
141ddf28 | 3795 | } else { |
7c559490 MD |
3796 | ret = lttng_metadata_printf(session, |
3797 | " = "); | |
3798 | if (ret) | |
3799 | goto end; | |
3800 | if (entry->start.signedness) | |
141ddf28 | 3801 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3802 | "%lld", (long long) entry->start.value); |
3803 | else | |
3804 | ret = lttng_metadata_printf(session, | |
3805 | "%llu", entry->start.value); | |
3806 | if (ret) | |
3807 | goto end; | |
3808 | if (entry->start.signedness == entry->end.signedness && | |
3809 | entry->start.value | |
3810 | == entry->end.value) { | |
141ddf28 | 3811 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3812 | ",\n"); |
3813 | } else { | |
3814 | if (entry->end.signedness) { | |
3815 | ret = lttng_metadata_printf(session, | |
3816 | " ... %lld,\n", | |
3817 | (long long) entry->end.value); | |
3818 | } else { | |
3819 | ret = lttng_metadata_printf(session, | |
3820 | " ... %llu,\n", | |
3821 | entry->end.value); | |
3822 | } | |
141ddf28 | 3823 | } |
7c559490 MD |
3824 | if (ret) |
3825 | goto end; | |
141ddf28 | 3826 | } |
141ddf28 MD |
3827 | } |
3828 | ret = print_tabs(session, nesting); | |
3829 | if (ret) | |
3830 | goto end; | |
ceabb767 | 3831 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3832 | end: |
3833 | return ret; | |
3834 | } | |
3835 | ||
d83004aa JD |
3836 | /* |
3837 | * Must be called with sessions_mutex held. | |
3838 | */ | |
c099397a | 3839 | static |
ceabb767 MD |
3840 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3841 | const struct lttng_event_field *field, | |
3842 | size_t nesting) | |
3843 | { | |
3844 | int ret; | |
3845 | ||
3846 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3847 | if (ret) | |
3848 | return ret; | |
3849 | return lttng_field_name_statedump(session, field, nesting); | |
3850 | } | |
3851 | ||
3852 | static | |
3853 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3854 | const struct lttng_event_field *field, | |
3855 | size_t nesting) | |
3856 | { | |
3857 | int ret; | |
3858 | ||
3859 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3860 | if (ret) | |
3861 | return ret; | |
3862 | return lttng_field_name_statedump(session, field, nesting); | |
3863 | } | |
3864 | ||
3865 | static | |
3866 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3867 | const struct lttng_type *type, | |
3868 | size_t nesting) | |
3869 | { | |
3870 | int ret; | |
3871 | ||
3872 | WARN_ON_ONCE(type->atype != atype_string); | |
3873 | /* Default encoding is UTF8 */ | |
3874 | ret = print_tabs(session, nesting); | |
3875 | if (ret) | |
3876 | return ret; | |
3877 | ret = lttng_metadata_printf(session, | |
3878 | "string%s", | |
3879 | type->u.string.encoding == lttng_encode_ASCII ? | |
3880 | " { encoding = ASCII; }" : ""); | |
3881 | return ret; | |
3882 | } | |
3883 | ||
3884 | static | |
3885 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3886 | const struct lttng_event_field *field, |
3887 | size_t nesting) | |
ceabb767 MD |
3888 | { |
3889 | int ret; | |
3890 | ||
3891 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3892 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3893 | if (ret) | |
3894 | return ret; | |
3895 | return lttng_field_name_statedump(session, field, nesting); | |
3896 | } | |
3897 | ||
3898 | /* | |
3899 | * Must be called with sessions_mutex held. | |
3900 | */ | |
3901 | static | |
3902 | int _lttng_type_statedump(struct lttng_session *session, | |
3903 | const struct lttng_type *type, | |
3904 | size_t nesting) | |
c099397a | 3905 | { |
c099397a | 3906 | int ret = 0; |
c099397a | 3907 | |
ceabb767 | 3908 | switch (type->atype) { |
8070f5c0 | 3909 | case atype_integer: |
ceabb767 | 3910 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3911 | break; |
ceabb767 MD |
3912 | case atype_enum_nestable: |
3913 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3914 | break; |
ceabb767 MD |
3915 | case atype_string: |
3916 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3917 | break; | |
3918 | case atype_struct_nestable: | |
3919 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3920 | break; |
ceabb767 MD |
3921 | case atype_variant_nestable: |
3922 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3923 | break; | |
3924 | ||
3925 | /* Nested arrays and sequences are not supported yet. */ | |
3926 | case atype_array_nestable: | |
3927 | case atype_sequence_nestable: | |
3928 | default: | |
3929 | WARN_ON_ONCE(1); | |
3930 | return -EINVAL; | |
8070f5c0 | 3931 | } |
ceabb767 MD |
3932 | return ret; |
3933 | } | |
8070f5c0 | 3934 | |
ceabb767 MD |
3935 | /* |
3936 | * Must be called with sessions_mutex held. | |
3937 | */ | |
3938 | static | |
3939 | int _lttng_field_statedump(struct lttng_session *session, | |
3940 | const struct lttng_event_field *field, | |
3941 | size_t nesting) | |
3942 | { | |
3943 | int ret = 0; | |
27d2368e | 3944 | |
ceabb767 MD |
3945 | switch (field->type.atype) { |
3946 | case atype_integer: | |
3947 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3948 | break; | |
3949 | case atype_enum_nestable: | |
3950 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3951 | break; |
8070f5c0 | 3952 | case atype_string: |
ceabb767 | 3953 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3954 | break; |
ceabb767 MD |
3955 | case atype_struct_nestable: |
3956 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3957 | break; |
ceabb767 MD |
3958 | case atype_array_nestable: |
3959 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3960 | break; |
ceabb767 MD |
3961 | case atype_sequence_nestable: |
3962 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3963 | break; |
ceabb767 MD |
3964 | case atype_variant_nestable: |
3965 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3966 | break; |
f513b2bf | 3967 | |
8070f5c0 MD |
3968 | default: |
3969 | WARN_ON_ONCE(1); | |
3970 | return -EINVAL; | |
3971 | } | |
3972 | return ret; | |
3973 | } | |
3974 | ||
3975 | static | |
a90917c3 | 3976 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3977 | struct lttng_ctx *ctx) |
3978 | { | |
3979 | int ret = 0; | |
3980 | int i; | |
3981 | ||
3982 | if (!ctx) | |
3983 | return 0; | |
3984 | for (i = 0; i < ctx->nr_fields; i++) { | |
3985 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3986 | ||
f513b2bf | 3987 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3988 | if (ret) |
3989 | return ret; | |
3990 | } | |
3991 | return ret; | |
3992 | } | |
3993 | ||
3994 | static | |
a90917c3 MD |
3995 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3996 | struct lttng_event *event) | |
8070f5c0 MD |
3997 | { |
3998 | const struct lttng_event_desc *desc = event->desc; | |
3999 | int ret = 0; | |
4000 | int i; | |
4001 | ||
4002 | for (i = 0; i < desc->nr_fields; i++) { | |
4003 | const struct lttng_event_field *field = &desc->fields[i]; | |
4004 | ||
f513b2bf | 4005 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
4006 | if (ret) |
4007 | return ret; | |
c099397a MD |
4008 | } |
4009 | return ret; | |
4010 | } | |
4011 | ||
d83004aa JD |
4012 | /* |
4013 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
4014 | * The entire event metadata is printed as a single atomic metadata |
4015 | * transaction. | |
d83004aa | 4016 | */ |
c099397a | 4017 | static |
a90917c3 | 4018 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
a90917c3 | 4019 | struct lttng_event *event) |
c099397a | 4020 | { |
710e9669 | 4021 | struct lttng_channel *chan; |
c099397a MD |
4022 | int ret = 0; |
4023 | ||
710e9669 MD |
4024 | WARN_ON_ONCE(event->container->type != LTTNG_EVENT_CONTAINER_CHANNEL); |
4025 | chan = lttng_event_container_get_channel(event->container); | |
585e5dcc | 4026 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 4027 | return 0; |
d83004aa | 4028 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
4029 | return 0; |
4030 | ||
8b97fd42 MD |
4031 | lttng_metadata_begin(session); |
4032 | ||
c099397a MD |
4033 | ret = lttng_metadata_printf(session, |
4034 | "event {\n" | |
ae734547 | 4035 | " name = \"%s\";\n" |
710e9669 | 4036 | " id = %zu;\n" |
b9074a1b | 4037 | " stream_id = %u;\n", |
c099397a MD |
4038 | event->desc->name, |
4039 | event->id, | |
710e9669 | 4040 | chan->id); |
c099397a MD |
4041 | if (ret) |
4042 | goto end; | |
4043 | ||
b9074a1b MD |
4044 | if (event->ctx) { |
4045 | ret = lttng_metadata_printf(session, | |
4046 | " context := struct {\n"); | |
4047 | if (ret) | |
4048 | goto end; | |
4049 | } | |
a90917c3 | 4050 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
4051 | if (ret) |
4052 | goto end; | |
b9074a1b MD |
4053 | if (event->ctx) { |
4054 | ret = lttng_metadata_printf(session, | |
4055 | " };\n"); | |
4056 | if (ret) | |
4057 | goto end; | |
4058 | } | |
8070f5c0 MD |
4059 | |
4060 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
4061 | " fields := struct {\n" |
4062 | ); | |
4063 | if (ret) | |
4064 | goto end; | |
4065 | ||
a90917c3 | 4066 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
4067 | if (ret) |
4068 | goto end; | |
4069 | ||
4070 | /* | |
4071 | * LTTng space reservation can only reserve multiples of the | |
4072 | * byte size. | |
4073 | */ | |
4074 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4075 | " };\n" |
4076 | "};\n\n"); | |
c099397a MD |
4077 | if (ret) |
4078 | goto end; | |
4079 | ||
c099397a MD |
4080 | event->metadata_dumped = 1; |
4081 | end: | |
8b97fd42 | 4082 | lttng_metadata_end(session); |
c099397a MD |
4083 | return ret; |
4084 | ||
4085 | } | |
4086 | ||
d83004aa JD |
4087 | /* |
4088 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
4089 | * The entire channel metadata is printed as a single atomic metadata |
4090 | * transaction. | |
d83004aa | 4091 | */ |
c099397a | 4092 | static |
a90917c3 MD |
4093 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
4094 | struct lttng_channel *chan) | |
c099397a MD |
4095 | { |
4096 | int ret = 0; | |
4097 | ||
585e5dcc | 4098 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 4099 | return 0; |
d83004aa JD |
4100 | |
4101 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
4102 | return 0; |
4103 | ||
8b97fd42 MD |
4104 | lttng_metadata_begin(session); |
4105 | ||
c099397a MD |
4106 | WARN_ON_ONCE(!chan->header_type); |
4107 | ret = lttng_metadata_printf(session, | |
4108 | "stream {\n" | |
4109 | " id = %u;\n" | |
9115fbdc | 4110 | " event.header := %s;\n" |
b9074a1b | 4111 | " packet.context := struct packet_context;\n", |
c099397a MD |
4112 | chan->id, |
4113 | chan->header_type == 1 ? "struct event_header_compact" : | |
4114 | "struct event_header_large"); | |
4115 | if (ret) | |
4116 | goto end; | |
4117 | ||
b9074a1b MD |
4118 | if (chan->ctx) { |
4119 | ret = lttng_metadata_printf(session, | |
4120 | " event.context := struct {\n"); | |
4121 | if (ret) | |
4122 | goto end; | |
4123 | } | |
a90917c3 | 4124 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
4125 | if (ret) |
4126 | goto end; | |
b9074a1b MD |
4127 | if (chan->ctx) { |
4128 | ret = lttng_metadata_printf(session, | |
4129 | " };\n"); | |
4130 | if (ret) | |
4131 | goto end; | |
4132 | } | |
8070f5c0 MD |
4133 | |
4134 | ret = lttng_metadata_printf(session, | |
b9074a1b | 4135 | "};\n\n"); |
8070f5c0 | 4136 | |
c099397a MD |
4137 | chan->metadata_dumped = 1; |
4138 | end: | |
8b97fd42 | 4139 | lttng_metadata_end(session); |
c099397a MD |
4140 | return ret; |
4141 | } | |
4142 | ||
d83004aa JD |
4143 | /* |
4144 | * Must be called with sessions_mutex held. | |
4145 | */ | |
9115fbdc | 4146 | static |
a90917c3 | 4147 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
4148 | { |
4149 | return lttng_metadata_printf(session, | |
4150 | "struct packet_context {\n" | |
a3ccff4f MD |
4151 | " uint64_clock_monotonic_t timestamp_begin;\n" |
4152 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
4153 | " uint64_t content_size;\n" |
4154 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 4155 | " uint64_t packet_seq_num;\n" |
a9afe705 | 4156 | " unsigned long events_discarded;\n" |
9115fbdc | 4157 | " uint32_t cpu_id;\n" |
c6dfdf6f | 4158 | "};\n\n" |
9115fbdc MD |
4159 | ); |
4160 | } | |
4161 | ||
4162 | /* | |
4163 | * Compact header: | |
4164 | * id: range: 0 - 30. | |
4165 | * id 31 is reserved to indicate an extended header. | |
4166 | * | |
4167 | * Large header: | |
4168 | * id: range: 0 - 65534. | |
4169 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
4170 | * |
4171 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
4172 | */ |
4173 | static | |
a90917c3 | 4174 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
4175 | { |
4176 | return lttng_metadata_printf(session, | |
4177 | "struct event_header_compact {\n" | |
4178 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
4179 | " variant <id> {\n" | |
4180 | " struct {\n" | |
a3ccff4f | 4181 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
4182 | " } compact;\n" |
4183 | " struct {\n" | |
4184 | " uint32_t id;\n" | |
a3ccff4f | 4185 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
4186 | " } extended;\n" |
4187 | " } v;\n" | |
4188 | "} align(%u);\n" | |
4189 | "\n" | |
4190 | "struct event_header_large {\n" | |
4191 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
4192 | " variant <id> {\n" | |
4193 | " struct {\n" | |
a3ccff4f | 4194 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
4195 | " } compact;\n" |
4196 | " struct {\n" | |
4197 | " uint32_t id;\n" | |
a3ccff4f | 4198 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
4199 | " } extended;\n" |
4200 | " } v;\n" | |
4201 | "} align(%u);\n\n", | |
a90917c3 MD |
4202 | lttng_alignof(uint32_t) * CHAR_BIT, |
4203 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
4204 | ); |
4205 | } | |
4206 | ||
a3ccff4f MD |
4207 | /* |
4208 | * Approximation of NTP time of day to clock monotonic correlation, | |
4209 | * taken at start of trace. | |
4210 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
4211 | * in future versions. | |
5283350b MD |
4212 | * This function may return a negative offset. It may happen if the |
4213 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
4214 | * |
4215 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
4216 | * y2038 compliant. | |
a3ccff4f MD |
4217 | */ |
4218 | static | |
8967b2a3 | 4219 | int64_t measure_clock_offset(void) |
a3ccff4f | 4220 | { |
dcb93448 | 4221 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 4222 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 4223 | int64_t offset; |
a3ccff4f | 4224 | unsigned long flags; |
3636085f MJ |
4225 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
4226 | struct timespec64 rts = { 0, 0 }; | |
4227 | #else | |
4228 | struct timespec rts = { 0, 0 }; | |
4229 | #endif | |
a3ccff4f MD |
4230 | |
4231 | /* Disable interrupts to increase correlation precision. */ | |
4232 | local_irq_save(flags); | |
4233 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
4234 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
4235 | ktime_get_real_ts64(&rts); | |
4236 | #else | |
216b6baa | 4237 | getnstimeofday(&rts); |
3636085f | 4238 | #endif |
a3ccff4f MD |
4239 | monotonic[1] = trace_clock_read64(); |
4240 | local_irq_restore(flags); | |
4241 | ||
dcb93448 | 4242 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
4243 | realtime = (uint64_t) rts.tv_sec * tcf; |
4244 | if (tcf == NSEC_PER_SEC) { | |
4245 | realtime += rts.tv_nsec; | |
4246 | } else { | |
4247 | uint64_t n = rts.tv_nsec * tcf; | |
4248 | ||
4249 | do_div(n, NSEC_PER_SEC); | |
4250 | realtime += n; | |
4251 | } | |
dcb93448 | 4252 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
4253 | return offset; |
4254 | } | |
4255 | ||
3eb95be4 JR |
4256 | static |
4257 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
4258 | { | |
0f3eaad4 | 4259 | int ret = 0; |
3eb95be4 JR |
4260 | size_t i; |
4261 | char cur; | |
4262 | ||
4263 | i = 0; | |
4264 | cur = string[i]; | |
4265 | while (cur != '\0') { | |
4266 | switch (cur) { | |
4267 | case '\n': | |
4268 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
4269 | break; | |
4270 | case '\\': | |
4271 | case '"': | |
4272 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
4273 | if (ret) | |
4274 | goto error; | |
4275 | /* We still print the current char */ | |
4276 | /* Fallthrough */ | |
4277 | default: | |
4278 | ret = lttng_metadata_printf(session, "%c", cur); | |
4279 | break; | |
4280 | } | |
4281 | ||
4282 | if (ret) | |
4283 | goto error; | |
4284 | ||
4285 | cur = string[++i]; | |
4286 | } | |
4287 | error: | |
4288 | return ret; | |
4289 | } | |
4290 | ||
4291 | static | |
1c88f269 JR |
4292 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
4293 | const char *field_value) | |
3eb95be4 JR |
4294 | { |
4295 | int ret; | |
4296 | ||
1c88f269 | 4297 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
4298 | if (ret) |
4299 | goto error; | |
4300 | ||
1c88f269 | 4301 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
4302 | if (ret) |
4303 | goto error; | |
4304 | ||
4305 | ret = lttng_metadata_printf(session, "\";\n"); | |
4306 | ||
4307 | error: | |
4308 | return ret; | |
4309 | } | |
4310 | ||
c099397a MD |
4311 | /* |
4312 | * Output metadata into this session's metadata buffers. | |
d83004aa | 4313 | * Must be called with sessions_mutex held. |
c099397a MD |
4314 | */ |
4315 | static | |
a90917c3 | 4316 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 4317 | { |
30bdb6e4 | 4318 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 4319 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 4320 | const char *product_uuid; |
a90917c3 MD |
4321 | struct lttng_channel *chan; |
4322 | struct lttng_event *event; | |
c099397a MD |
4323 | int ret = 0; |
4324 | ||
585e5dcc | 4325 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 4326 | return 0; |
8b97fd42 MD |
4327 | |
4328 | lttng_metadata_begin(session); | |
4329 | ||
c099397a MD |
4330 | if (session->metadata_dumped) |
4331 | goto skip_session; | |
c099397a | 4332 | |
d793d5e1 | 4333 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
4334 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
4335 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
4336 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
4337 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
4338 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
4339 | |
4340 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4341 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
4342 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
4343 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
4344 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4345 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4346 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4347 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4348 | "\n" |
4349 | "trace {\n" | |
4350 | " major = %u;\n" | |
4351 | " minor = %u;\n" | |
30bdb6e4 | 4352 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4353 | " byte_order = %s;\n" |
4354 | " packet.header := struct {\n" | |
4355 | " uint32_t magic;\n" | |
1ec3f75a | 4356 | " uint8_t uuid[16];\n" |
d793d5e1 | 4357 | " uint32_t stream_id;\n" |
5594698f | 4358 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4359 | " };\n" |
d793d5e1 | 4360 | "};\n\n", |
a90917c3 MD |
4361 | lttng_alignof(uint8_t) * CHAR_BIT, |
4362 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4363 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4364 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4365 | sizeof(unsigned long) * CHAR_BIT, |
4366 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4367 | CTF_SPEC_MAJOR, |
4368 | CTF_SPEC_MINOR, | |
d793d5e1 | 4369 | uuid_s, |
5214fa50 | 4370 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4371 | "be" |
4372 | #else | |
4373 | "le" | |
4374 | #endif | |
4375 | ); | |
4376 | if (ret) | |
4377 | goto end; | |
4378 | ||
99dc9597 MD |
4379 | ret = lttng_metadata_printf(session, |
4380 | "env {\n" | |
a6058143 | 4381 | " hostname = \"%s\";\n" |
c6c9e10f | 4382 | " domain = \"kernel\";\n" |
99dc9597 | 4383 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4384 | " kernel_release = \"%s\";\n" |
4385 | " kernel_version = \"%s\";\n" | |
4386 | " tracer_name = \"lttng-modules\";\n" | |
4387 | " tracer_major = %d;\n" | |
4388 | " tracer_minor = %d;\n" | |
4389 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4390 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4391 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4392 | utsname()->sysname, |
4393 | utsname()->release, | |
c6c9e10f MD |
4394 | utsname()->version, |
4395 | LTTNG_MODULES_MAJOR_VERSION, | |
4396 | LTTNG_MODULES_MINOR_VERSION, | |
4397 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4398 | ); |
4399 | if (ret) | |
4400 | goto end; | |
4401 | ||
1c88f269 JR |
4402 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
4403 | if (ret) | |
4404 | goto end; | |
4405 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
4406 | session->creation_time); | |
3eb95be4 JR |
4407 | if (ret) |
4408 | goto end; | |
4409 | ||
c88f762e GB |
4410 | /* Add the product UUID to the 'env' section */ |
4411 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4412 | if (product_uuid) { | |
4413 | ret = lttng_metadata_printf(session, | |
4414 | " product_uuid = \"%s\";\n", | |
4415 | product_uuid | |
4416 | ); | |
4417 | if (ret) | |
4418 | goto end; | |
4419 | } | |
4420 | ||
4421 | /* Close the 'env' section */ | |
3eb95be4 JR |
4422 | ret = lttng_metadata_printf(session, "};\n\n"); |
4423 | if (ret) | |
4424 | goto end; | |
4425 | ||
a3ccff4f MD |
4426 | ret = lttng_metadata_printf(session, |
4427 | "clock {\n" | |
2754583e MD |
4428 | " name = \"%s\";\n", |
4429 | trace_clock_name() | |
a82c63f1 MD |
4430 | ); |
4431 | if (ret) | |
4432 | goto end; | |
4433 | ||
4434 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4435 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4436 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4437 | clock_uuid_s |
4438 | ); | |
4439 | if (ret) | |
4440 | goto end; | |
4441 | } | |
4442 | ||
4443 | ret = lttng_metadata_printf(session, | |
2754583e | 4444 | " description = \"%s\";\n" |
a3ccff4f MD |
4445 | " freq = %llu; /* Frequency, in Hz */\n" |
4446 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4447 | " offset = %lld;\n" |
a3ccff4f | 4448 | "};\n\n", |
2754583e | 4449 | trace_clock_description(), |
a3ccff4f | 4450 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4451 | (long long) measure_clock_offset() |
a3ccff4f MD |
4452 | ); |
4453 | if (ret) | |
4454 | goto end; | |
4455 | ||
4456 | ret = lttng_metadata_printf(session, | |
4457 | "typealias integer {\n" | |
4458 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4459 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4460 | "} := uint27_clock_monotonic_t;\n" |
4461 | "\n" | |
4462 | "typealias integer {\n" | |
4463 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4464 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4465 | "} := uint32_clock_monotonic_t;\n" |
4466 | "\n" | |
4467 | "typealias integer {\n" | |
4468 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4469 | " map = clock.%s.value;\n" |
a3ccff4f | 4470 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4471 | trace_clock_name(), |
a3ccff4f | 4472 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4473 | trace_clock_name(), |
4474 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4475 | trace_clock_name() | |
a3ccff4f MD |
4476 | ); |
4477 | if (ret) | |
4478 | goto end; | |
4479 | ||
a90917c3 | 4480 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4481 | if (ret) |
4482 | goto end; | |
4483 | ||
a90917c3 | 4484 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4485 | if (ret) |
4486 | goto end; | |
4487 | ||
c099397a MD |
4488 | skip_session: |
4489 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4490 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4491 | if (ret) |
4492 | goto end; | |
4493 | } | |
4494 | ||
4495 | list_for_each_entry(event, &session->events, list) { | |
710e9669 MD |
4496 | /* Skip counter container. */ |
4497 | if (event->container->type != LTTNG_EVENT_CONTAINER_CHANNEL) | |
4498 | continue; | |
4499 | ret = _lttng_event_metadata_statedump(session, event); | |
c099397a MD |
4500 | if (ret) |
4501 | goto end; | |
4502 | } | |
4503 | session->metadata_dumped = 1; | |
4504 | end: | |
8b97fd42 | 4505 | lttng_metadata_end(session); |
c099397a MD |
4506 | return ret; |
4507 | } | |
4508 | ||
c0e31d2e | 4509 | /** |
a90917c3 | 4510 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4511 | * @transport: transport structure |
4512 | * | |
4513 | * Registers a transport which can be used as output to extract the data out of | |
4514 | * LTTng. The module calling this registration function must ensure that no | |
4515 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4516 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4517 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4518 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4519 | * after its registration must it synchronize the TLBs. |
4520 | */ | |
a90917c3 | 4521 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4522 | { |
4523 | /* | |
4524 | * Make sure no page fault can be triggered by the module about to be | |
4525 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4526 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4527 | */ |
263b6c88 | 4528 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4529 | |
4530 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4531 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4532 | mutex_unlock(&sessions_mutex); |
4533 | } | |
a90917c3 | 4534 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4535 | |
4536 | /** | |
a90917c3 | 4537 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4538 | * @transport: transport structure |
4539 | */ | |
a90917c3 | 4540 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4541 | { |
4542 | mutex_lock(&sessions_mutex); | |
4543 | list_del(&transport->node); | |
4544 | mutex_unlock(&sessions_mutex); | |
4545 | } | |
a90917c3 | 4546 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4547 | |
a101fa10 MD |
4548 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4549 | { | |
4550 | /* | |
4551 | * Make sure no page fault can be triggered by the module about to be | |
4552 | * registered. We deal with this here so we don't have to call | |
4553 | * vmalloc_sync_mappings() in each module's init. | |
4554 | */ | |
4555 | wrapper_vmalloc_sync_mappings(); | |
4556 | ||
4557 | mutex_lock(&sessions_mutex); | |
4558 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4559 | mutex_unlock(&sessions_mutex); | |
4560 | } | |
4561 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4562 | ||
4563 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4564 | { | |
4565 | mutex_lock(&sessions_mutex); | |
4566 | list_del(&transport->node); | |
4567 | mutex_unlock(&sessions_mutex); | |
4568 | } | |
4569 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4570 | ||
5f4c791e | 4571 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4572 | |
4573 | enum cpuhp_state lttng_hp_prepare; | |
4574 | enum cpuhp_state lttng_hp_online; | |
4575 | ||
4576 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4577 | { | |
4578 | struct lttng_cpuhp_node *lttng_node; | |
4579 | ||
4580 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4581 | switch (lttng_node->component) { | |
4582 | case LTTNG_RING_BUFFER_FRONTEND: | |
4583 | return 0; | |
4584 | case LTTNG_RING_BUFFER_BACKEND: | |
4585 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4586 | case LTTNG_RING_BUFFER_ITER: | |
4587 | return 0; | |
4588 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4589 | return 0; | |
4590 | default: | |
4591 | return -EINVAL; | |
4592 | } | |
4593 | } | |
4594 | ||
4595 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4596 | { | |
4597 | struct lttng_cpuhp_node *lttng_node; | |
4598 | ||
4599 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4600 | switch (lttng_node->component) { | |
4601 | case LTTNG_RING_BUFFER_FRONTEND: | |
4602 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4603 | case LTTNG_RING_BUFFER_BACKEND: | |
4604 | return 0; | |
4605 | case LTTNG_RING_BUFFER_ITER: | |
4606 | return 0; | |
4607 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4608 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4609 | default: | |
4610 | return -EINVAL; | |
4611 | } | |
4612 | } | |
4613 | ||
4614 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4615 | { | |
4616 | struct lttng_cpuhp_node *lttng_node; | |
4617 | ||
4618 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4619 | switch (lttng_node->component) { | |
4620 | case LTTNG_RING_BUFFER_FRONTEND: | |
4621 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4622 | case LTTNG_RING_BUFFER_BACKEND: | |
4623 | return 0; | |
4624 | case LTTNG_RING_BUFFER_ITER: | |
4625 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4626 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4627 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4628 | default: | |
4629 | return -EINVAL; | |
4630 | } | |
4631 | } | |
4632 | ||
4633 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4634 | { | |
4635 | struct lttng_cpuhp_node *lttng_node; | |
4636 | ||
4637 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4638 | switch (lttng_node->component) { | |
4639 | case LTTNG_RING_BUFFER_FRONTEND: | |
4640 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4641 | case LTTNG_RING_BUFFER_BACKEND: | |
4642 | return 0; | |
4643 | case LTTNG_RING_BUFFER_ITER: | |
4644 | return 0; | |
4645 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4646 | return 0; | |
4647 | default: | |
4648 | return -EINVAL; | |
4649 | } | |
4650 | } | |
4651 | ||
4652 | static int __init lttng_init_cpu_hotplug(void) | |
4653 | { | |
4654 | int ret; | |
4655 | ||
4656 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4657 | lttng_hotplug_prepare, | |
4658 | lttng_hotplug_dead); | |
4659 | if (ret < 0) { | |
4660 | return ret; | |
4661 | } | |
4662 | lttng_hp_prepare = ret; | |
4663 | lttng_rb_set_hp_prepare(ret); | |
4664 | ||
4665 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4666 | lttng_hotplug_online, | |
4667 | lttng_hotplug_offline); | |
4668 | if (ret < 0) { | |
4669 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4670 | lttng_hp_prepare = 0; | |
4671 | return ret; | |
4672 | } | |
4673 | lttng_hp_online = ret; | |
4674 | lttng_rb_set_hp_online(ret); | |
4675 | ||
4676 | return 0; | |
4677 | } | |
4678 | ||
4679 | static void __exit lttng_exit_cpu_hotplug(void) | |
4680 | { | |
4681 | lttng_rb_set_hp_online(0); | |
4682 | cpuhp_remove_multi_state(lttng_hp_online); | |
4683 | lttng_rb_set_hp_prepare(0); | |
4684 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4685 | } | |
4686 | ||
5f4c791e | 4687 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4688 | static int lttng_init_cpu_hotplug(void) |
4689 | { | |
4690 | return 0; | |
4691 | } | |
4692 | static void lttng_exit_cpu_hotplug(void) | |
4693 | { | |
4694 | } | |
5f4c791e | 4695 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4696 | |
4697 | ||
a90917c3 | 4698 | static int __init lttng_events_init(void) |
4e3c1b9b | 4699 | { |
1c25284c MD |
4700 | int ret; |
4701 | ||
453b2495 JD |
4702 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4703 | if (ret) | |
4704 | return ret; | |
389d7070 | 4705 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4706 | if (ret) |
4707 | return ret; | |
4708 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4709 | if (ret) |
4710 | return ret; | |
4711 | ret = lttng_probes_init(); | |
389d7070 MD |
4712 | if (ret) |
4713 | return ret; | |
07dfc1d0 | 4714 | ret = lttng_context_init(); |
20591cf7 MD |
4715 | if (ret) |
4716 | return ret; | |
07dfc1d0 MD |
4717 | ret = lttng_tracepoint_init(); |
4718 | if (ret) | |
4719 | goto error_tp; | |
a90917c3 | 4720 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4721 | if (!event_cache) { |
4722 | ret = -ENOMEM; | |
dffef45d FD |
4723 | goto error_kmem_event; |
4724 | } | |
4725 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4726 | if (!event_notifier_cache) { | |
4727 | ret = -ENOMEM; | |
4728 | goto error_kmem_event_notifier; | |
20591cf7 | 4729 | } |
80996790 | 4730 | ret = lttng_abi_init(); |
02119ee5 MD |
4731 | if (ret) |
4732 | goto error_abi; | |
0c956676 MD |
4733 | ret = lttng_logger_init(); |
4734 | if (ret) | |
4735 | goto error_logger; | |
1e367326 MD |
4736 | ret = lttng_init_cpu_hotplug(); |
4737 | if (ret) | |
4738 | goto error_hotplug; | |
101215b7 | 4739 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4740 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4741 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4742 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4743 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4744 | LTTNG_VERSION_NAME, |
4745 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4746 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4747 | #else | |
4748 | "", | |
4749 | #endif | |
4750 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4751 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4752 | #else | |
4753 | ""); | |
4754 | #endif | |
4e3c1b9b | 4755 | return 0; |
0c956676 | 4756 | |
1e367326 MD |
4757 | error_hotplug: |
4758 | lttng_logger_exit(); | |
0c956676 MD |
4759 | error_logger: |
4760 | lttng_abi_exit(); | |
02119ee5 | 4761 | error_abi: |
dffef45d FD |
4762 | kmem_cache_destroy(event_notifier_cache); |
4763 | error_kmem_event_notifier: | |
1c25284c | 4764 | kmem_cache_destroy(event_cache); |
dffef45d | 4765 | error_kmem_event: |
20591cf7 | 4766 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4767 | error_tp: |
4768 | lttng_context_exit(); | |
101215b7 | 4769 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4770 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4771 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4772 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4773 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4774 | LTTNG_VERSION_NAME, |
4775 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4776 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4777 | #else | |
4778 | "", | |
4779 | #endif | |
4780 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4781 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4782 | #else | |
4783 | ""); | |
4784 | #endif | |
1c25284c | 4785 | return ret; |
4e3c1b9b MD |
4786 | } |
4787 | ||
a90917c3 | 4788 | module_init(lttng_events_init); |
11b5a3c2 | 4789 | |
a90917c3 | 4790 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4791 | { |
a90917c3 | 4792 | struct lttng_session *session, *tmpsession; |
92e94819 | 4793 | |
1e367326 | 4794 | lttng_exit_cpu_hotplug(); |
0c956676 | 4795 | lttng_logger_exit(); |
80996790 | 4796 | lttng_abi_exit(); |
92e94819 | 4797 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4798 | lttng_session_destroy(session); |
11b5a3c2 | 4799 | kmem_cache_destroy(event_cache); |
dffef45d | 4800 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4801 | lttng_tracepoint_exit(); |
07dfc1d0 | 4802 | lttng_context_exit(); |
101215b7 | 4803 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4804 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4805 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4806 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4807 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4808 | LTTNG_VERSION_NAME, |
4809 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4810 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4811 | #else | |
4812 | "", | |
4813 | #endif | |
4814 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4815 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4816 | #else | |
4817 | ""); | |
4818 | #endif | |
4e3c1b9b | 4819 | } |
92e94819 | 4820 | |
a90917c3 | 4821 | module_exit(lttng_events_exit); |
11b5a3c2 | 4822 | |
7ca11e77 | 4823 | #include <generated/patches.h> |
101215b7 MJ |
4824 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4825 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4826 | #endif | |
4827 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4828 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4829 | #endif | |
92e94819 MD |
4830 | MODULE_LICENSE("GPL and additional rights"); |
4831 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4832 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4833 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4834 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4835 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4836 | LTTNG_MODULES_EXTRAVERSION); |