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> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
0b365677 | 39 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 40 | #include <lttng/tracer.h> |
21f58fb7 | 41 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
42 | #include <lttng/abi-old.h> |
43 | #include <lttng/endian.h> | |
44 | #include <lttng/string-utils.h> | |
4a11ef1c | 45 | #include <lttng/utils.h> |
24591303 MD |
46 | #include <ringbuffer/backend.h> |
47 | #include <ringbuffer/frontend.h> | |
3636085f | 48 | #include <wrapper/time.h> |
4e3c1b9b | 49 | |
d83004aa JD |
50 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
51 | ||
4e3c1b9b | 52 | static LIST_HEAD(sessions); |
750b05f2 | 53 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 54 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 55 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
56 | /* |
57 | * Protect the sessions and metadata caches. | |
58 | */ | |
4e3c1b9b MD |
59 | static DEFINE_MUTEX(sessions_mutex); |
60 | static struct kmem_cache *event_cache; | |
dffef45d | 61 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 62 | |
b2bc0bc8 FD |
63 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
64 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
65 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 66 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 67 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 68 | |
a90917c3 | 69 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 70 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
71 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
72 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 73 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 74 | static |
a90917c3 MD |
75 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
76 | struct lttng_channel *chan, | |
77 | struct lttng_event *event); | |
c099397a | 78 | static |
a90917c3 | 79 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
80 | static |
81 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 82 | static |
ceabb767 MD |
83 | int _lttng_type_statedump(struct lttng_session *session, |
84 | const struct lttng_type *type, | |
85 | size_t nesting); | |
86 | static | |
f513b2bf MD |
87 | int _lttng_field_statedump(struct lttng_session *session, |
88 | const struct lttng_event_field *field, | |
89 | size_t nesting); | |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
5f4c791e | 93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0)) |
92da05ce MJ |
94 | synchronize_rcu(); |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
92da05ce MJ |
97 | #endif |
98 | ||
5f4c791e | 99 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
100 | #ifdef CONFIG_PREEMPT_RT_FULL |
101 | synchronize_rcu(); | |
102 | #endif | |
5f4c791e | 103 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
5f4c791e | 107 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
9fe593d2 FD |
120 | static struct lttng_transport *lttng_transport_find(const char *name) |
121 | { | |
122 | struct lttng_transport *transport; | |
123 | ||
124 | list_for_each_entry(transport, <tng_transport_list, node) { | |
125 | if (!strcmp(transport->name, name)) | |
126 | return transport; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
3c997079 MD |
131 | /* |
132 | * Called with sessions lock held. | |
133 | */ | |
134 | int lttng_session_active(void) | |
135 | { | |
136 | struct lttng_session *iter; | |
137 | ||
138 | list_for_each_entry(iter, &sessions, list) { | |
139 | if (iter->active) | |
140 | return 1; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
a90917c3 | 145 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 146 | { |
a90917c3 | 147 | struct lttng_session *session; |
d83004aa | 148 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 149 | int i; |
4e3c1b9b MD |
150 | |
151 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 152 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 153 | if (!session) |
d83004aa | 154 | goto err; |
4e3c1b9b | 155 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 156 | INIT_LIST_HEAD(&session->events); |
a7008254 | 157 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
158 | |
159 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
160 | GFP_KERNEL); | |
161 | if (!metadata_cache) | |
162 | goto err_free_session; | |
0ca42eb7 | 163 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
164 | if (!metadata_cache->data) |
165 | goto err_free_cache; | |
166 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
167 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 168 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
169 | session->metadata_cache = metadata_cache; |
170 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
171 | memcpy(&metadata_cache->uuid, &session->uuid, |
172 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
173 | INIT_LIST_HEAD(&session->enablers_head); |
174 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
175 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 176 | list_add(&session->list, &sessions); |
d1f652f8 MD |
177 | session->pid_tracker.session = session; |
178 | session->pid_tracker.tracker_type = TRACKER_PID; | |
179 | session->vpid_tracker.session = session; | |
180 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
181 | session->uid_tracker.session = session; | |
182 | session->uid_tracker.tracker_type = TRACKER_UID; | |
183 | session->vuid_tracker.session = session; | |
184 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
185 | session->gid_tracker.session = session; | |
186 | session->gid_tracker.tracker_type = TRACKER_GID; | |
187 | session->vgid_tracker.session = session; | |
188 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
189 | mutex_unlock(&sessions_mutex); |
190 | return session; | |
d83004aa JD |
191 | |
192 | err_free_cache: | |
193 | kfree(metadata_cache); | |
194 | err_free_session: | |
48f5e0b5 | 195 | lttng_kvfree(session); |
d83004aa JD |
196 | err: |
197 | mutex_unlock(&sessions_mutex); | |
198 | return NULL; | |
199 | } | |
200 | ||
99f52fcc FD |
201 | static |
202 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
203 | { | |
204 | struct lttng_counter_transport *transport; | |
205 | ||
206 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
207 | if (!strcmp(transport->name, name)) | |
208 | return transport; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | struct lttng_counter *lttng_kernel_counter_create( | |
214 | const char *counter_transport_name, | |
215 | size_t number_dimensions, const size_t *dimensions_sizes) | |
216 | { | |
217 | struct lttng_counter *counter = NULL; | |
218 | struct lttng_counter_transport *counter_transport = NULL; | |
219 | ||
220 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
221 | if (!counter_transport) { | |
222 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
223 | counter_transport_name); | |
224 | goto notransport; | |
225 | } | |
226 | if (!try_module_get(counter_transport->owner)) { | |
227 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
228 | goto notransport; | |
229 | } | |
230 | ||
231 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
232 | if (!counter) | |
233 | goto nomem; | |
234 | ||
235 | /* Create event notifier error counter. */ | |
236 | counter->ops = &counter_transport->ops; | |
237 | counter->transport = counter_transport; | |
238 | ||
239 | counter->counter = counter->ops->counter_create( | |
240 | number_dimensions, dimensions_sizes, 0); | |
241 | if (!counter->counter) { | |
242 | goto create_error; | |
243 | } | |
244 | ||
245 | return counter; | |
246 | ||
247 | create_error: | |
248 | lttng_kvfree(counter); | |
249 | nomem: | |
250 | if (counter_transport) | |
251 | module_put(counter_transport->owner); | |
252 | notransport: | |
253 | return NULL; | |
254 | } | |
255 | ||
750b05f2 FD |
256 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
257 | { | |
258 | struct lttng_transport *transport = NULL; | |
259 | struct lttng_event_notifier_group *event_notifier_group; | |
260 | const char *transport_name = "relay-event-notifier"; | |
261 | size_t subbuf_size = 4096; //TODO | |
262 | size_t num_subbuf = 16; //TODO | |
263 | unsigned int switch_timer_interval = 0; | |
264 | unsigned int read_timer_interval = 0; | |
dffef45d | 265 | int i; |
750b05f2 FD |
266 | |
267 | mutex_lock(&sessions_mutex); | |
268 | ||
269 | transport = lttng_transport_find(transport_name); | |
270 | if (!transport) { | |
271 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
272 | transport_name); | |
273 | goto notransport; | |
274 | } | |
275 | if (!try_module_get(transport->owner)) { | |
276 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
277 | transport_name); | |
278 | goto notransport; | |
279 | } | |
280 | ||
281 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
282 | GFP_KERNEL); | |
283 | if (!event_notifier_group) | |
284 | goto nomem; | |
285 | ||
286 | /* | |
287 | * Initialize the ring buffer used to store event notifier | |
288 | * notifications. | |
289 | */ | |
290 | event_notifier_group->ops = &transport->ops; | |
291 | event_notifier_group->chan = transport->ops.channel_create( | |
292 | transport_name, event_notifier_group, NULL, | |
293 | subbuf_size, num_subbuf, switch_timer_interval, | |
294 | read_timer_interval); | |
295 | if (!event_notifier_group->chan) | |
296 | goto create_error; | |
297 | ||
298 | event_notifier_group->transport = transport; | |
dffef45d FD |
299 | |
300 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
301 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
302 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
303 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
304 | ||
750b05f2 FD |
305 | list_add(&event_notifier_group->node, &event_notifier_groups); |
306 | ||
307 | mutex_unlock(&sessions_mutex); | |
308 | ||
309 | return event_notifier_group; | |
310 | ||
311 | create_error: | |
312 | lttng_kvfree(event_notifier_group); | |
313 | nomem: | |
314 | if (transport) | |
315 | module_put(transport->owner); | |
316 | notransport: | |
317 | mutex_unlock(&sessions_mutex); | |
318 | return NULL; | |
319 | } | |
320 | ||
d83004aa JD |
321 | void metadata_cache_destroy(struct kref *kref) |
322 | { | |
323 | struct lttng_metadata_cache *cache = | |
324 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 325 | vfree(cache->data); |
d83004aa | 326 | kfree(cache); |
4e3c1b9b MD |
327 | } |
328 | ||
a90917c3 | 329 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 330 | { |
a90917c3 MD |
331 | struct lttng_channel *chan, *tmpchan; |
332 | struct lttng_event *event, *tmpevent; | |
d83004aa | 333 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 334 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 335 | int ret; |
4e3c1b9b MD |
336 | |
337 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 338 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 339 | list_for_each_entry(chan, &session->chan, list) { |
3b82c4e1 | 340 | ret = lttng_syscalls_unregister_channel(chan); |
1ec65de1 MD |
341 | WARN_ON(ret); |
342 | } | |
dda6a249 | 343 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 344 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
345 | WARN_ON(ret); |
346 | } | |
abcca994 | 347 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 348 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 349 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
350 | WARN_ON(ret); |
351 | } | |
b2bc0bc8 | 352 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 353 | &session->enablers_head, node) |
b2bc0bc8 | 354 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 355 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 356 | _lttng_event_destroy(event); |
d83004aa JD |
357 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
358 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 359 | _lttng_channel_destroy(chan); |
d83004aa | 360 | } |
ab036a63 | 361 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
362 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
363 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 364 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
365 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
366 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
367 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
368 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
369 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
370 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 371 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
372 | list_del(&session->list); |
373 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 374 | lttng_kvfree(session); |
4e3c1b9b MD |
375 | } |
376 | ||
dffef45d FD |
377 | void lttng_event_notifier_group_destroy( |
378 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 379 | { |
dffef45d FD |
380 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
381 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
382 | int ret; | |
383 | ||
750b05f2 FD |
384 | if (!event_notifier_group) |
385 | return; | |
386 | ||
387 | mutex_lock(&sessions_mutex); | |
dffef45d | 388 | |
3b82c4e1 | 389 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
390 | WARN_ON(ret); |
391 | ||
dffef45d FD |
392 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
393 | &event_notifier_group->event_notifiers_head, list) { | |
394 | ret = _lttng_event_notifier_unregister(event_notifier); | |
395 | WARN_ON(ret); | |
396 | } | |
397 | ||
b01155ba FD |
398 | /* Wait for in-flight event notifier to complete */ |
399 | synchronize_trace(); | |
400 | ||
21f58fb7 FD |
401 | irq_work_sync(&event_notifier_group->wakeup_pending); |
402 | ||
8a8ac9a8 FD |
403 | kfree(event_notifier_group->sc_filter); |
404 | ||
dffef45d FD |
405 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
406 | &event_notifier_group->enablers_head, node) | |
407 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
408 | ||
409 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
410 | &event_notifier_group->event_notifiers_head, list) | |
411 | _lttng_event_notifier_destroy(event_notifier); | |
412 | ||
99f52fcc FD |
413 | if (event_notifier_group->error_counter) { |
414 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 415 | |
99f52fcc FD |
416 | error_counter->ops->counter_destroy(error_counter->counter); |
417 | module_put(error_counter->transport->owner); | |
418 | lttng_kvfree(error_counter); | |
419 | event_notifier_group->error_counter = NULL; | |
420 | } | |
421 | ||
750b05f2 FD |
422 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
423 | module_put(event_notifier_group->transport->owner); | |
424 | list_del(&event_notifier_group->node); | |
dffef45d | 425 | |
750b05f2 FD |
426 | mutex_unlock(&sessions_mutex); |
427 | lttng_kvfree(event_notifier_group); | |
428 | } | |
429 | ||
601252cf MD |
430 | int lttng_session_statedump(struct lttng_session *session) |
431 | { | |
432 | int ret; | |
433 | ||
434 | mutex_lock(&sessions_mutex); | |
435 | ret = lttng_statedump_start(session); | |
436 | mutex_unlock(&sessions_mutex); | |
437 | return ret; | |
438 | } | |
439 | ||
a90917c3 | 440 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
441 | { |
442 | int ret = 0; | |
a90917c3 | 443 | struct lttng_channel *chan; |
c0e31d2e MD |
444 | |
445 | mutex_lock(&sessions_mutex); | |
446 | if (session->active) { | |
447 | ret = -EBUSY; | |
448 | goto end; | |
449 | } | |
c099397a | 450 | |
3c997079 MD |
451 | /* Set transient enabler state to "enabled" */ |
452 | session->tstate = 1; | |
453 | ||
4ef81e4a | 454 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 455 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 456 | |
c099397a MD |
457 | /* |
458 | * Snapshot the number of events per channel to know the type of header | |
459 | * we need to use. | |
460 | */ | |
461 | list_for_each_entry(chan, &session->chan, list) { | |
462 | if (chan->header_type) | |
463 | continue; /* don't change it if session stop/restart */ | |
464 | if (chan->free_event_id < 31) | |
465 | chan->header_type = 1; /* compact */ | |
466 | else | |
467 | chan->header_type = 2; /* large */ | |
468 | } | |
469 | ||
64af2437 | 470 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
471 | list_for_each_entry(chan, &session->chan, list) { |
472 | if (chan->channel_type != METADATA_CHANNEL) | |
473 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
474 | } | |
64af2437 | 475 | |
a8f2d0c7 MJ |
476 | WRITE_ONCE(session->active, 1); |
477 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 478 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 479 | if (ret) { |
a8f2d0c7 | 480 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
481 | goto end; |
482 | } | |
483 | ret = lttng_statedump_start(session); | |
360f38ea | 484 | if (ret) |
a8f2d0c7 | 485 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
486 | end: |
487 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 488 | return ret; |
c0e31d2e MD |
489 | } |
490 | ||
a90917c3 | 491 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
492 | { |
493 | int ret = 0; | |
64af2437 | 494 | struct lttng_channel *chan; |
c0e31d2e MD |
495 | |
496 | mutex_lock(&sessions_mutex); | |
497 | if (!session->active) { | |
498 | ret = -EBUSY; | |
499 | goto end; | |
500 | } | |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
502 | |
503 | /* Set transient enabler state to "disabled" */ | |
504 | session->tstate = 0; | |
b2bc0bc8 | 505 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
506 | |
507 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
508 | list_for_each_entry(chan, &session->chan, list) { |
509 | if (chan->channel_type != METADATA_CHANNEL) | |
510 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
511 | } | |
c0e31d2e MD |
512 | end: |
513 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 514 | return ret; |
c0e31d2e MD |
515 | } |
516 | ||
9616f0bf JD |
517 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
518 | { | |
519 | int ret = 0; | |
520 | struct lttng_channel *chan; | |
521 | struct lttng_event *event; | |
522 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
523 | struct lttng_metadata_stream *stream; | |
524 | ||
525 | mutex_lock(&sessions_mutex); | |
526 | if (!session->active) { | |
527 | ret = -EBUSY; | |
528 | goto end; | |
529 | } | |
530 | ||
531 | mutex_lock(&cache->lock); | |
532 | memset(cache->data, 0, cache->cache_alloc); | |
533 | cache->metadata_written = 0; | |
534 | cache->version++; | |
535 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
536 | stream->metadata_out = 0; | |
537 | stream->metadata_in = 0; | |
538 | } | |
539 | mutex_unlock(&cache->lock); | |
540 | ||
541 | session->metadata_dumped = 0; | |
542 | list_for_each_entry(chan, &session->chan, list) { | |
543 | chan->metadata_dumped = 0; | |
544 | } | |
545 | ||
546 | list_for_each_entry(event, &session->events, list) { | |
547 | event->metadata_dumped = 0; | |
548 | } | |
549 | ||
550 | ret = _lttng_session_metadata_statedump(session); | |
551 | ||
552 | end: | |
553 | mutex_unlock(&sessions_mutex); | |
554 | return ret; | |
555 | } | |
556 | ||
a90917c3 | 557 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 558 | { |
3c997079 | 559 | int ret = 0; |
e64957da | 560 | |
3c997079 MD |
561 | mutex_lock(&sessions_mutex); |
562 | if (channel->channel_type == METADATA_CHANNEL) { | |
563 | ret = -EPERM; | |
564 | goto end; | |
565 | } | |
566 | if (channel->enabled) { | |
567 | ret = -EEXIST; | |
568 | goto end; | |
569 | } | |
570 | /* Set transient enabler state to "enabled" */ | |
571 | channel->tstate = 1; | |
b2bc0bc8 | 572 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 573 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 574 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
575 | end: |
576 | mutex_unlock(&sessions_mutex); | |
577 | return ret; | |
e64957da MD |
578 | } |
579 | ||
a90917c3 | 580 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 581 | { |
3c997079 | 582 | int ret = 0; |
e64957da | 583 | |
3c997079 MD |
584 | mutex_lock(&sessions_mutex); |
585 | if (channel->channel_type == METADATA_CHANNEL) { | |
586 | ret = -EPERM; | |
587 | goto end; | |
588 | } | |
589 | if (!channel->enabled) { | |
590 | ret = -EEXIST; | |
591 | goto end; | |
592 | } | |
593 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 594 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
595 | /* Set transient enabler state to "enabled" */ |
596 | channel->tstate = 0; | |
b2bc0bc8 | 597 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
598 | end: |
599 | mutex_unlock(&sessions_mutex); | |
600 | return ret; | |
e64957da MD |
601 | } |
602 | ||
a90917c3 | 603 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 604 | { |
3c997079 | 605 | int ret = 0; |
e64957da | 606 | |
3c997079 MD |
607 | mutex_lock(&sessions_mutex); |
608 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
609 | ret = -EPERM; | |
610 | goto end; | |
611 | } | |
612 | if (event->enabled) { | |
613 | ret = -EEXIST; | |
614 | goto end; | |
615 | } | |
a0493bef | 616 | switch (event->instrumentation) { |
b4a75708 | 617 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
618 | case LTTNG_KERNEL_SYSCALL: |
619 | ret = -EINVAL; | |
620 | break; | |
b4a75708 MD |
621 | |
622 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 623 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 624 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 625 | break; |
b4a75708 | 626 | |
a0493bef MD |
627 | case LTTNG_KERNEL_KRETPROBE: |
628 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
629 | break; | |
b4a75708 MD |
630 | |
631 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
632 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
633 | default: |
634 | WARN_ON_ONCE(1); | |
635 | ret = -EINVAL; | |
636 | } | |
3c997079 MD |
637 | end: |
638 | mutex_unlock(&sessions_mutex); | |
639 | return ret; | |
e64957da MD |
640 | } |
641 | ||
a90917c3 | 642 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 643 | { |
3c997079 | 644 | int ret = 0; |
e64957da | 645 | |
3c997079 MD |
646 | mutex_lock(&sessions_mutex); |
647 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
648 | ret = -EPERM; | |
649 | goto end; | |
650 | } | |
651 | if (!event->enabled) { | |
652 | ret = -EEXIST; | |
653 | goto end; | |
654 | } | |
a0493bef | 655 | switch (event->instrumentation) { |
b4a75708 | 656 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
a0493bef MD |
657 | case LTTNG_KERNEL_SYSCALL: |
658 | ret = -EINVAL; | |
659 | break; | |
b4a75708 MD |
660 | |
661 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
149b9a9d | 662 | case LTTNG_KERNEL_UPROBE: |
a8f2d0c7 | 663 | WRITE_ONCE(event->enabled, 0); |
a0493bef | 664 | break; |
b4a75708 | 665 | |
a0493bef | 666 | case LTTNG_KERNEL_KRETPROBE: |
b4a75708 | 667 | |
a0493bef MD |
668 | ret = lttng_kretprobes_event_enable_state(event, 0); |
669 | break; | |
b4a75708 MD |
670 | |
671 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
672 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
a0493bef MD |
673 | default: |
674 | WARN_ON_ONCE(1); | |
675 | ret = -EINVAL; | |
676 | } | |
3c997079 MD |
677 | end: |
678 | mutex_unlock(&sessions_mutex); | |
679 | return ret; | |
e64957da MD |
680 | } |
681 | ||
dffef45d FD |
682 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
683 | { | |
684 | int ret = 0; | |
685 | ||
686 | mutex_lock(&sessions_mutex); | |
687 | if (event_notifier->enabled) { | |
688 | ret = -EEXIST; | |
689 | goto end; | |
690 | } | |
691 | switch (event_notifier->instrumentation) { | |
b4a75708 | 692 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 693 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
694 | ret = -EINVAL; |
695 | break; | |
b4a75708 MD |
696 | |
697 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 698 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
699 | WRITE_ONCE(event_notifier->enabled, 1); |
700 | break; | |
b4a75708 MD |
701 | |
702 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
703 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
704 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
705 | default: |
706 | WARN_ON_ONCE(1); | |
707 | ret = -EINVAL; | |
708 | } | |
709 | end: | |
710 | mutex_unlock(&sessions_mutex); | |
711 | return ret; | |
712 | } | |
713 | ||
714 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
715 | { | |
716 | int ret = 0; | |
717 | ||
718 | mutex_lock(&sessions_mutex); | |
719 | if (!event_notifier->enabled) { | |
720 | ret = -EEXIST; | |
721 | goto end; | |
722 | } | |
723 | switch (event_notifier->instrumentation) { | |
b4a75708 | 724 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
8a8ac9a8 | 725 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
726 | ret = -EINVAL; |
727 | break; | |
b4a75708 MD |
728 | |
729 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 730 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
731 | WRITE_ONCE(event_notifier->enabled, 0); |
732 | break; | |
b4a75708 MD |
733 | |
734 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
735 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
736 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
737 | default: |
738 | WARN_ON_ONCE(1); | |
739 | ret = -EINVAL; | |
740 | } | |
741 | end: | |
742 | mutex_unlock(&sessions_mutex); | |
743 | return ret; | |
744 | } | |
745 | ||
a90917c3 | 746 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
747 | const char *transport_name, |
748 | void *buf_addr, | |
4e3c1b9b MD |
749 | size_t subbuf_size, size_t num_subbuf, |
750 | unsigned int switch_timer_interval, | |
d83004aa JD |
751 | unsigned int read_timer_interval, |
752 | enum channel_type channel_type) | |
4e3c1b9b | 753 | { |
a90917c3 MD |
754 | struct lttng_channel *chan; |
755 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
756 | |
757 | mutex_lock(&sessions_mutex); | |
d83004aa | 758 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 759 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 760 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 761 | if (!transport) { |
5a15f70c | 762 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 763 | transport_name); |
c0e31d2e | 764 | goto notransport; |
f3d01b96 | 765 | } |
a33c9927 | 766 | if (!try_module_get(transport->owner)) { |
5a15f70c | 767 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
768 | goto notransport; |
769 | } | |
a90917c3 | 770 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 771 | if (!chan) |
c0e31d2e | 772 | goto nomem; |
4e3c1b9b | 773 | chan->session = session; |
05d32c64 | 774 | chan->id = session->free_chan_id++; |
3b731ab1 | 775 | chan->ops = &transport->ops; |
125b4df4 MD |
776 | /* |
777 | * Note: the channel creation op already writes into the packet | |
778 | * headers. Therefore the "chan" information used as input | |
779 | * should be already accessible. | |
780 | */ | |
5f5ddf01 MD |
781 | chan->chan = transport->ops.channel_create(transport_name, |
782 | chan, buf_addr, subbuf_size, num_subbuf, | |
783 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
784 | if (!chan->chan) |
785 | goto create_error; | |
3c997079 | 786 | chan->tstate = 1; |
e64957da | 787 | chan->enabled = 1; |
a33c9927 | 788 | chan->transport = transport; |
d83004aa | 789 | chan->channel_type = channel_type; |
4e3c1b9b MD |
790 | list_add(&chan->list, &session->chan); |
791 | mutex_unlock(&sessions_mutex); | |
792 | return chan; | |
793 | ||
f3d01b96 MD |
794 | create_error: |
795 | kfree(chan); | |
c0e31d2e | 796 | nomem: |
a33c9927 MD |
797 | if (transport) |
798 | module_put(transport->owner); | |
c0e31d2e | 799 | notransport: |
e5382b6d | 800 | active: |
4e3c1b9b MD |
801 | mutex_unlock(&sessions_mutex); |
802 | return NULL; | |
803 | } | |
804 | ||
805 | /* | |
d83004aa JD |
806 | * Only used internally at session destruction for per-cpu channels, and |
807 | * when metadata channel is released. | |
808 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 809 | */ |
aa7c23a9 | 810 | static |
a90917c3 | 811 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 812 | { |
11b5a3c2 | 813 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 814 | module_put(chan->transport->owner); |
4e3c1b9b | 815 | list_del(&chan->list); |
8070f5c0 | 816 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
817 | kfree(chan); |
818 | } | |
819 | ||
d83004aa JD |
820 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
821 | { | |
822 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
823 | ||
824 | /* Protect the metadata cache with the sessions_mutex. */ | |
825 | mutex_lock(&sessions_mutex); | |
826 | _lttng_channel_destroy(chan); | |
827 | mutex_unlock(&sessions_mutex); | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
830 | ||
831 | static | |
832 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
833 | { | |
834 | stream->finalized = 1; | |
835 | wake_up_interruptible(&stream->read_wait); | |
836 | } | |
837 | ||
a101fa10 | 838 | |
e5382b6d MD |
839 | /* |
840 | * Supports event creation while tracing session is active. | |
3c997079 | 841 | * Needs to be called with sessions mutex held. |
e5382b6d | 842 | */ |
3c997079 MD |
843 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
844 | struct lttng_kernel_event *event_param, | |
845 | void *filter, | |
846 | const struct lttng_event_desc *event_desc, | |
847 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 848 | { |
3c997079 | 849 | struct lttng_session *session = chan->session; |
a90917c3 | 850 | struct lttng_event *event; |
3c997079 MD |
851 | const char *event_name; |
852 | struct hlist_head *head; | |
3d084699 | 853 | int ret; |
4e3c1b9b | 854 | |
abc0446a | 855 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 856 | ret = -EMFILE; |
e5382b6d | 857 | goto full; |
abc0446a | 858 | } |
3c997079 MD |
859 | |
860 | switch (itype) { | |
861 | case LTTNG_KERNEL_TRACEPOINT: | |
862 | event_name = event_desc->name; | |
863 | break; | |
b4a75708 MD |
864 | |
865 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
866 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
867 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
33a39a3c | 868 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
869 | event_name = event_param->name; |
870 | break; | |
b4a75708 MD |
871 | |
872 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
873 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
3c997079 MD |
874 | default: |
875 | WARN_ON_ONCE(1); | |
876 | ret = -EINVAL; | |
877 | goto type_error; | |
878 | } | |
4a11ef1c FD |
879 | |
880 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
881 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 882 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
883 | WARN_ON_ONCE(!event->desc); |
884 | if (!strncmp(event->desc->name, event_name, | |
885 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
886 | && chan == event->chan) { | |
887 | ret = -EEXIST; | |
888 | goto exist; | |
abc0446a MD |
889 | } |
890 | } | |
3c997079 | 891 | |
11b5a3c2 | 892 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 893 | if (!event) { |
4cf0bf51 | 894 | ret = -ENOMEM; |
4e3c1b9b | 895 | goto cache_error; |
abc0446a | 896 | } |
4e3c1b9b MD |
897 | event->chan = chan; |
898 | event->filter = filter; | |
e5382b6d | 899 | event->id = chan->free_event_id++; |
3c997079 MD |
900 | event->instrumentation = itype; |
901 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 902 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
903 | INIT_LIST_HEAD(&event->enablers_ref_head); |
904 | ||
905 | switch (itype) { | |
ab2277d6 | 906 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
907 | /* Event will be enabled by enabler sync. */ |
908 | event->enabled = 0; | |
909 | event->registered = 0; | |
0bcedee9 | 910 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 911 | if (!event->desc) { |
4cf0bf51 | 912 | ret = -ENOENT; |
d3dbe23c | 913 | goto register_error; |
abc0446a | 914 | } |
3c997079 MD |
915 | /* Populate lttng_event structure before event registration. */ |
916 | smp_wmb(); | |
baf20995 | 917 | break; |
b4a75708 | 918 | |
ab2277d6 | 919 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
920 | /* |
921 | * Needs to be explicitly enabled after creation, since | |
922 | * we may want to apply filters. | |
923 | */ | |
924 | event->enabled = 0; | |
3c997079 MD |
925 | event->registered = 1; |
926 | /* | |
927 | * Populate lttng_event structure before event | |
928 | * registration. | |
929 | */ | |
930 | smp_wmb(); | |
8bf17deb | 931 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
932 | event_param->u.kprobe.symbol_name, |
933 | event_param->u.kprobe.offset, | |
934 | event_param->u.kprobe.addr, | |
935 | event); | |
abc0446a | 936 | if (ret) { |
4cf0bf51 | 937 | ret = -EINVAL; |
d6d808f3 | 938 | goto register_error; |
abc0446a | 939 | } |
edeb3137 MD |
940 | ret = try_module_get(event->desc->owner); |
941 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 942 | break; |
b4a75708 | 943 | |
7371f44c MD |
944 | case LTTNG_KERNEL_KRETPROBE: |
945 | { | |
a90917c3 | 946 | struct lttng_event *event_return; |
7371f44c MD |
947 | |
948 | /* kretprobe defines 2 events */ | |
a0493bef MD |
949 | /* |
950 | * Needs to be explicitly enabled after creation, since | |
951 | * we may want to apply filters. | |
952 | */ | |
953 | event->enabled = 0; | |
3c997079 | 954 | event->registered = 1; |
7371f44c MD |
955 | event_return = |
956 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 957 | if (!event_return) { |
4cf0bf51 | 958 | ret = -ENOMEM; |
7371f44c | 959 | goto register_error; |
abc0446a | 960 | } |
7371f44c MD |
961 | event_return->chan = chan; |
962 | event_return->filter = filter; | |
963 | event_return->id = chan->free_event_id++; | |
a0493bef | 964 | event_return->enabled = 0; |
3c997079 MD |
965 | event_return->registered = 1; |
966 | event_return->instrumentation = itype; | |
484ec217 FD |
967 | INIT_LIST_HEAD(&event_return->filter_bytecode_runtime_head); |
968 | INIT_LIST_HEAD(&event_return->enablers_ref_head); | |
7371f44c | 969 | /* |
a90917c3 | 970 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
971 | */ |
972 | smp_wmb(); | |
3c997079 | 973 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
974 | event_param->u.kretprobe.symbol_name, |
975 | event_param->u.kretprobe.offset, | |
976 | event_param->u.kretprobe.addr, | |
977 | event, event_return); | |
978 | if (ret) { | |
979 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 980 | ret = -EINVAL; |
7371f44c MD |
981 | goto register_error; |
982 | } | |
983 | /* Take 2 refs on the module: one per event. */ | |
984 | ret = try_module_get(event->desc->owner); | |
985 | WARN_ON_ONCE(!ret); | |
986 | ret = try_module_get(event->desc->owner); | |
987 | WARN_ON_ONCE(!ret); | |
a90917c3 | 988 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 989 | event_return); |
abc0446a | 990 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
991 | if (ret) { |
992 | kmem_cache_free(event_cache, event_return); | |
993 | module_put(event->desc->owner); | |
994 | module_put(event->desc->owner); | |
995 | goto statedump_error; | |
996 | } | |
997 | list_add(&event_return->list, &chan->session->events); | |
998 | break; | |
999 | } | |
b4a75708 | 1000 | |
33a39a3c | 1001 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
1002 | /* |
1003 | * Needs to be explicitly enabled after creation, since | |
1004 | * we may want to apply filters. | |
1005 | */ | |
1006 | event->enabled = 0; | |
3c997079 MD |
1007 | event->registered = 0; |
1008 | event->desc = event_desc; | |
badfe9f5 MD |
1009 | switch (event_param->u.syscall.entryexit) { |
1010 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1011 | ret = -EINVAL; | |
1012 | goto register_error; | |
1013 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1014 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1015 | break; | |
1016 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1017 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1018 | break; | |
1019 | } | |
1020 | switch (event_param->u.syscall.abi) { | |
1021 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1022 | ret = -EINVAL; | |
1023 | goto register_error; | |
1024 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1025 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1026 | break; | |
1027 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1028 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1029 | break; | |
1030 | } | |
abc0446a | 1031 | if (!event->desc) { |
4cf0bf51 | 1032 | ret = -EINVAL; |
259b6cb3 | 1033 | goto register_error; |
abc0446a | 1034 | } |
1ec65de1 | 1035 | break; |
b4a75708 | 1036 | |
149b9a9d | 1037 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
1038 | /* |
1039 | * Needs to be explicitly enabled after creation, since | |
1040 | * we may want to apply filters. | |
1041 | */ | |
1042 | event->enabled = 0; | |
1043 | event->registered = 1; | |
3aed4dca | 1044 | |
a344f64b FD |
1045 | /* |
1046 | * Populate lttng_event structure before event | |
1047 | * registration. | |
1048 | */ | |
1049 | smp_wmb(); | |
149b9a9d | 1050 | |
83b802dc | 1051 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1052 | event_param->u.uprobe.fd, |
149b9a9d YB |
1053 | event); |
1054 | if (ret) | |
1055 | goto register_error; | |
1056 | ret = try_module_get(event->desc->owner); | |
1057 | WARN_ON_ONCE(!ret); | |
1058 | break; | |
b4a75708 | 1059 | |
e884017c | 1060 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1061 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
baf20995 MD |
1062 | default: |
1063 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1064 | ret = -EINVAL; |
df07930b | 1065 | goto register_error; |
baf20995 | 1066 | } |
a90917c3 | 1067 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
1068 | WARN_ON_ONCE(ret > 0); |
1069 | if (ret) { | |
c099397a | 1070 | goto statedump_error; |
abc0446a | 1071 | } |
3c997079 | 1072 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1073 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1074 | return event; |
1075 | ||
c099397a | 1076 | statedump_error: |
259b6cb3 | 1077 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1078 | register_error: |
11b5a3c2 | 1079 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1080 | cache_error: |
1081 | exist: | |
3c997079 | 1082 | type_error: |
e5382b6d | 1083 | full: |
4cf0bf51 | 1084 | return ERR_PTR(ret); |
4e3c1b9b MD |
1085 | } |
1086 | ||
dffef45d FD |
1087 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1088 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1089 | uint64_t token, uint64_t error_counter_index, |
1090 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1091 | struct lttng_kernel_event_notifier *event_notifier_param, |
1092 | void *filter, enum lttng_kernel_instrumentation itype) | |
1093 | { | |
1094 | struct lttng_event_notifier *event_notifier; | |
ab04d7b1 | 1095 | struct lttng_counter *error_counter; |
dffef45d FD |
1096 | const char *event_name; |
1097 | struct hlist_head *head; | |
1098 | int ret; | |
1099 | ||
1100 | switch (itype) { | |
1101 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1102 | event_name = event_desc->name; |
1103 | break; | |
b4a75708 MD |
1104 | |
1105 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1106 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
8a8ac9a8 | 1107 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1108 | event_name = event_notifier_param->event.name; |
1109 | break; | |
b4a75708 MD |
1110 | |
1111 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1112 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1113 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1114 | default: |
1115 | WARN_ON_ONCE(1); | |
1116 | ret = -EINVAL; | |
1117 | goto type_error; | |
1118 | } | |
1119 | ||
1120 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1121 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1122 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1123 | WARN_ON_ONCE(!event_notifier->desc); | |
1124 | if (!strncmp(event_notifier->desc->name, event_name, | |
1125 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1126 | && event_notifier_group == event_notifier->group | |
1127 | && token == event_notifier->user_token) { | |
1128 | ret = -EEXIST; | |
1129 | goto exist; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1134 | if (!event_notifier) { | |
1135 | ret = -ENOMEM; | |
1136 | goto cache_error; | |
1137 | } | |
21f58fb7 | 1138 | |
dffef45d FD |
1139 | event_notifier->group = event_notifier_group; |
1140 | event_notifier->user_token = token; | |
99f52fcc | 1141 | event_notifier->error_counter_index = error_counter_index; |
99d223ad | 1142 | event_notifier->num_captures = 0; |
dffef45d FD |
1143 | event_notifier->filter = filter; |
1144 | event_notifier->instrumentation = itype; | |
1145 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1146 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1147 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1148 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1149 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1150 | ||
1151 | switch (itype) { | |
1152 | case LTTNG_KERNEL_TRACEPOINT: | |
1153 | /* Event will be enabled by enabler sync. */ | |
1154 | event_notifier->enabled = 0; | |
1155 | event_notifier->registered = 0; | |
1156 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1157 | if (!event_notifier->desc) { | |
1158 | ret = -ENOENT; | |
1159 | goto register_error; | |
1160 | } | |
1161 | /* Populate lttng_event_notifier structure before event registration. */ | |
1162 | smp_wmb(); | |
1163 | break; | |
b4a75708 | 1164 | |
dffef45d | 1165 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1166 | /* |
1167 | * Needs to be explicitly enabled after creation, since | |
1168 | * we may want to apply filters. | |
1169 | */ | |
1170 | event_notifier->enabled = 0; | |
1171 | event_notifier->registered = 1; | |
1172 | /* | |
1173 | * Populate lttng_event_notifier structure before event | |
1174 | * registration. | |
1175 | */ | |
1176 | smp_wmb(); | |
1177 | ret = lttng_kprobes_register_event_notifier( | |
1178 | event_notifier_param->event.u.kprobe.symbol_name, | |
1179 | event_notifier_param->event.u.kprobe.offset, | |
1180 | event_notifier_param->event.u.kprobe.addr, | |
1181 | event_notifier); | |
1182 | if (ret) { | |
1183 | ret = -EINVAL; | |
1184 | goto register_error; | |
1185 | } | |
1186 | ret = try_module_get(event_notifier->desc->owner); | |
1187 | WARN_ON_ONCE(!ret); | |
1188 | break; | |
b4a75708 | 1189 | |
8a8ac9a8 FD |
1190 | case LTTNG_KERNEL_SYSCALL: |
1191 | /* | |
1192 | * Needs to be explicitly enabled after creation, since | |
1193 | * we may want to apply filters. | |
1194 | */ | |
1195 | event_notifier->enabled = 0; | |
1196 | event_notifier->registered = 0; | |
1197 | event_notifier->desc = event_desc; | |
1198 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1199 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1200 | ret = -EINVAL; | |
1201 | goto register_error; | |
1202 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1203 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1204 | break; | |
1205 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1206 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1207 | break; | |
1208 | } | |
1209 | switch (event_notifier_param->event.u.syscall.abi) { | |
1210 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1211 | ret = -EINVAL; | |
1212 | goto register_error; | |
1213 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1214 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1215 | break; | |
1216 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1217 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | if (!event_notifier->desc) { | |
1222 | ret = -EINVAL; | |
1223 | goto register_error; | |
1224 | } | |
1225 | break; | |
b4a75708 | 1226 | |
dffef45d | 1227 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1228 | /* |
1229 | * Needs to be explicitly enabled after creation, since | |
1230 | * we may want to apply filters. | |
1231 | */ | |
1232 | event_notifier->enabled = 0; | |
1233 | event_notifier->registered = 1; | |
1234 | ||
1235 | /* | |
1236 | * Populate lttng_event_notifier structure before | |
1237 | * event_notifier registration. | |
1238 | */ | |
1239 | smp_wmb(); | |
1240 | ||
1241 | ret = lttng_uprobes_register_event_notifier( | |
1242 | event_notifier_param->event.name, | |
1243 | event_notifier_param->event.u.uprobe.fd, | |
1244 | event_notifier); | |
1245 | if (ret) | |
1246 | goto register_error; | |
1247 | ret = try_module_get(event_notifier->desc->owner); | |
1248 | WARN_ON_ONCE(!ret); | |
1249 | break; | |
b4a75708 MD |
1250 | |
1251 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1252 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1253 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1254 | default: |
1255 | WARN_ON_ONCE(1); | |
1256 | ret = -EINVAL; | |
1257 | goto register_error; | |
1258 | } | |
1259 | ||
1260 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1261 | hlist_add_head(&event_notifier->hlist, head); | |
99f52fcc FD |
1262 | |
1263 | /* | |
1264 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1265 | * bucket is currently in use. We trust it. The session lock |
1266 | * synchronizes against concurrent creation of the error | |
1267 | * counter. | |
99f52fcc | 1268 | */ |
ab04d7b1 MD |
1269 | error_counter = event_notifier_group->error_counter; |
1270 | if (error_counter) { | |
99f52fcc FD |
1271 | size_t dimension_index[1]; |
1272 | ||
1273 | /* | |
1274 | * Check that the index is within the boundary of the counter. | |
1275 | */ | |
1276 | if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) { | |
1277 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1278 | event_notifier_group->error_counter_len, event_notifier->error_counter_index); | |
1279 | ret = -EINVAL; | |
1280 | goto register_error; | |
1281 | } | |
1282 | ||
1283 | dimension_index[0] = event_notifier->error_counter_index; | |
ab04d7b1 | 1284 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1285 | if (ret) { |
1286 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1287 | event_notifier->error_counter_index); | |
1288 | goto register_error; | |
1289 | } | |
1290 | } | |
1291 | ||
dffef45d FD |
1292 | return event_notifier; |
1293 | ||
1294 | register_error: | |
1295 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1296 | cache_error: | |
1297 | exist: | |
1298 | type_error: | |
1299 | return ERR_PTR(ret); | |
1300 | } | |
1301 | ||
99f52fcc FD |
1302 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1303 | const size_t *dim_indexes, int32_t cpu, | |
1304 | int64_t *val, bool *overflow, bool *underflow) | |
1305 | { | |
1306 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1307 | cpu, val, overflow, underflow); | |
1308 | } | |
1309 | ||
1310 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1311 | const size_t *dim_indexes, int64_t *val, | |
1312 | bool *overflow, bool *underflow) | |
1313 | { | |
1314 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1315 | val, overflow, underflow); | |
1316 | } | |
1317 | ||
1318 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1319 | const size_t *dim_indexes) | |
1320 | { | |
1321 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1322 | } | |
1323 | ||
3c997079 MD |
1324 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1325 | struct lttng_kernel_event *event_param, | |
1326 | void *filter, | |
1327 | const struct lttng_event_desc *event_desc, | |
1328 | enum lttng_kernel_instrumentation itype) | |
1329 | { | |
1330 | struct lttng_event *event; | |
1331 | ||
1332 | mutex_lock(&sessions_mutex); | |
1333 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1334 | itype); | |
1335 | mutex_unlock(&sessions_mutex); | |
1336 | return event; | |
1337 | } | |
1338 | ||
dffef45d FD |
1339 | struct lttng_event_notifier *lttng_event_notifier_create( |
1340 | const struct lttng_event_desc *event_desc, | |
99f52fcc FD |
1341 | uint64_t id, uint64_t error_counter_index, |
1342 | struct lttng_event_notifier_group *event_notifier_group, | |
dffef45d FD |
1343 | struct lttng_kernel_event_notifier *event_notifier_param, |
1344 | void *filter, enum lttng_kernel_instrumentation itype) | |
1345 | { | |
1346 | struct lttng_event_notifier *event_notifier; | |
1347 | ||
1348 | mutex_lock(&sessions_mutex); | |
1349 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc FD |
1350 | error_counter_index, event_notifier_group, |
1351 | event_notifier_param, filter, itype); | |
dffef45d FD |
1352 | mutex_unlock(&sessions_mutex); |
1353 | return event_notifier; | |
1354 | } | |
1355 | ||
3c997079 MD |
1356 | /* Only used for tracepoints for now. */ |
1357 | static | |
1358 | void register_event(struct lttng_event *event) | |
1359 | { | |
1360 | const struct lttng_event_desc *desc; | |
f127e61e | 1361 | int ret = -EINVAL; |
3c997079 | 1362 | |
3c997079 MD |
1363 | if (event->registered) |
1364 | return; | |
4ecb5ad5 | 1365 | |
3c997079 | 1366 | desc = event->desc; |
4ecb5ad5 MD |
1367 | switch (event->instrumentation) { |
1368 | case LTTNG_KERNEL_TRACEPOINT: | |
1369 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1370 | desc->probe_callback, | |
1371 | event); | |
1372 | break; | |
b4a75708 | 1373 | |
4ecb5ad5 | 1374 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1375 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 | 1376 | break; |
b4a75708 MD |
1377 | |
1378 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1379 | case LTTNG_KERNEL_UPROBE: /* Fall-through */ | |
4ecb5ad5 | 1380 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1381 | ret = 0; |
1382 | break; | |
b4a75708 | 1383 | |
e884017c | 1384 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1385 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
4ecb5ad5 MD |
1386 | default: |
1387 | WARN_ON_ONCE(1); | |
1388 | } | |
3c997079 MD |
1389 | if (!ret) |
1390 | event->registered = 1; | |
1391 | } | |
1392 | ||
4e3c1b9b MD |
1393 | /* |
1394 | * Only used internally at session destruction. | |
1395 | */ | |
a90917c3 | 1396 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1397 | { |
4ecb5ad5 | 1398 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1399 | int ret = -EINVAL; |
1400 | ||
3c997079 MD |
1401 | if (!event->registered) |
1402 | return 0; | |
1403 | ||
4ecb5ad5 | 1404 | desc = event->desc; |
38d024ae | 1405 | switch (event->instrumentation) { |
ab2277d6 | 1406 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1407 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1408 | event->desc->probe_callback, |
11b5a3c2 | 1409 | event); |
baf20995 | 1410 | break; |
b4a75708 | 1411 | |
ab2277d6 | 1412 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1413 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1414 | ret = 0; |
1415 | break; | |
b4a75708 | 1416 | |
7371f44c MD |
1417 | case LTTNG_KERNEL_KRETPROBE: |
1418 | lttng_kretprobes_unregister(event); | |
1419 | ret = 0; | |
1420 | break; | |
b4a75708 | 1421 | |
33a39a3c | 1422 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1423 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 | 1424 | break; |
b4a75708 | 1425 | |
4ecb5ad5 | 1426 | case LTTNG_KERNEL_NOOP: |
259b6cb3 MD |
1427 | ret = 0; |
1428 | break; | |
b4a75708 | 1429 | |
149b9a9d | 1430 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1431 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1432 | ret = 0; |
1433 | break; | |
b4a75708 | 1434 | |
e884017c | 1435 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1436 | default: |
1437 | WARN_ON_ONCE(1); | |
1438 | } | |
3c997079 MD |
1439 | if (!ret) |
1440 | event->registered = 0; | |
dda6a249 MD |
1441 | return ret; |
1442 | } | |
1443 | ||
dffef45d FD |
1444 | /* Only used for tracepoints for now. */ |
1445 | static | |
b01155ba | 1446 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1447 | { |
1448 | const struct lttng_event_desc *desc; | |
1449 | int ret = -EINVAL; | |
1450 | ||
1451 | if (event_notifier->registered) | |
1452 | return; | |
1453 | ||
1454 | desc = event_notifier->desc; | |
1455 | switch (event_notifier->instrumentation) { | |
1456 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1457 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1458 | desc->event_notifier_callback, | |
1459 | event_notifier); | |
1460 | break; | |
b4a75708 | 1461 | |
8a8ac9a8 FD |
1462 | case LTTNG_KERNEL_SYSCALL: |
1463 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1464 | break; | |
b4a75708 MD |
1465 | |
1466 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
9de67196 | 1467 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1468 | ret = 0; |
1469 | break; | |
b4a75708 MD |
1470 | |
1471 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1472 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1473 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1474 | default: |
1475 | WARN_ON_ONCE(1); | |
1476 | } | |
1477 | if (!ret) | |
1478 | event_notifier->registered = 1; | |
1479 | } | |
1480 | ||
1481 | static | |
1482 | int _lttng_event_notifier_unregister( | |
1483 | struct lttng_event_notifier *event_notifier) | |
1484 | { | |
1485 | const struct lttng_event_desc *desc; | |
1486 | int ret = -EINVAL; | |
1487 | ||
1488 | if (!event_notifier->registered) | |
1489 | return 0; | |
1490 | ||
1491 | desc = event_notifier->desc; | |
1492 | switch (event_notifier->instrumentation) { | |
1493 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1494 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1495 | event_notifier->desc->event_notifier_callback, | |
1496 | event_notifier); | |
1497 | break; | |
b4a75708 | 1498 | |
dffef45d | 1499 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1500 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1501 | ret = 0; | |
1502 | break; | |
b4a75708 | 1503 | |
9de67196 FD |
1504 | case LTTNG_KERNEL_UPROBE: |
1505 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1506 | ret = 0; | |
1507 | break; | |
b4a75708 | 1508 | |
8a8ac9a8 FD |
1509 | case LTTNG_KERNEL_SYSCALL: |
1510 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1511 | break; | |
b4a75708 MD |
1512 | |
1513 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1514 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1515 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1516 | default: |
1517 | WARN_ON_ONCE(1); | |
1518 | } | |
1519 | if (!ret) | |
1520 | event_notifier->registered = 0; | |
1521 | return ret; | |
1522 | } | |
1523 | ||
dda6a249 MD |
1524 | /* |
1525 | * Only used internally at session destruction. | |
1526 | */ | |
be066e6c | 1527 | static |
a90917c3 | 1528 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1529 | { |
966ad253 MD |
1530 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1531 | ||
edeb3137 MD |
1532 | switch (event->instrumentation) { |
1533 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1534 | lttng_event_desc_put(event->desc); |
edeb3137 | 1535 | break; |
b4a75708 | 1536 | |
edeb3137 MD |
1537 | case LTTNG_KERNEL_KPROBE: |
1538 | module_put(event->desc->owner); | |
8bf17deb | 1539 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1540 | break; |
b4a75708 | 1541 | |
7371f44c MD |
1542 | case LTTNG_KERNEL_KRETPROBE: |
1543 | module_put(event->desc->owner); | |
1544 | lttng_kretprobes_destroy_private(event); | |
1545 | break; | |
b4a75708 | 1546 | |
33a39a3c | 1547 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1548 | break; |
b4a75708 | 1549 | |
149b9a9d YB |
1550 | case LTTNG_KERNEL_UPROBE: |
1551 | module_put(event->desc->owner); | |
83b802dc | 1552 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1553 | break; |
b4a75708 | 1554 | |
e884017c | 1555 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
b4a75708 | 1556 | case LTTNG_KERNEL_NOOP: /* Fall-through */ |
edeb3137 MD |
1557 | default: |
1558 | WARN_ON_ONCE(1); | |
1559 | } | |
dda6a249 | 1560 | list_del(&event->list); |
8070f5c0 | 1561 | lttng_destroy_context(event->ctx); |
966ad253 MD |
1562 | lttng_free_event_filter_runtime(event); |
1563 | /* Free event enabler refs */ | |
1564 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1565 | &event->enablers_ref_head, node) | |
1566 | kfree(enabler_ref); | |
11b5a3c2 | 1567 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1568 | } |
1569 | ||
dffef45d FD |
1570 | /* |
1571 | * Only used internally at session destruction. | |
1572 | */ | |
1573 | static | |
1574 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1575 | { | |
3ef5cc03 MD |
1576 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1577 | ||
dffef45d FD |
1578 | switch (event_notifier->instrumentation) { |
1579 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1580 | lttng_event_desc_put(event_notifier->desc); |
1581 | break; | |
b4a75708 | 1582 | |
dffef45d | 1583 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1584 | module_put(event_notifier->desc->owner); |
1585 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1586 | break; | |
b4a75708 | 1587 | |
8a8ac9a8 FD |
1588 | case LTTNG_KERNEL_SYSCALL: |
1589 | break; | |
b4a75708 | 1590 | |
9de67196 FD |
1591 | case LTTNG_KERNEL_UPROBE: |
1592 | module_put(event_notifier->desc->owner); | |
1593 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1594 | break; | |
b4a75708 MD |
1595 | |
1596 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1597 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1598 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
dffef45d FD |
1599 | default: |
1600 | WARN_ON_ONCE(1); | |
1601 | } | |
1602 | list_del(&event_notifier->list); | |
3ef5cc03 MD |
1603 | lttng_free_event_notifier_filter_runtime(event_notifier); |
1604 | /* Free event enabler refs */ | |
1605 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1606 | &event_notifier->enablers_ref_head, node) | |
1607 | kfree(enabler_ref); | |
dffef45d FD |
1608 | kmem_cache_free(event_notifier_cache, event_notifier); |
1609 | } | |
1610 | ||
d1f652f8 MD |
1611 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1612 | enum tracker_type tracker_type) | |
e0130fab | 1613 | { |
d1f652f8 MD |
1614 | switch (tracker_type) { |
1615 | case TRACKER_PID: | |
1616 | return &session->pid_tracker; | |
1617 | case TRACKER_VPID: | |
1618 | return &session->vpid_tracker; | |
1619 | case TRACKER_UID: | |
1620 | return &session->uid_tracker; | |
1621 | case TRACKER_VUID: | |
1622 | return &session->vuid_tracker; | |
1623 | case TRACKER_GID: | |
1624 | return &session->gid_tracker; | |
1625 | case TRACKER_VGID: | |
1626 | return &session->vgid_tracker; | |
1627 | default: | |
1628 | WARN_ON_ONCE(1); | |
1629 | return NULL; | |
1630 | } | |
1631 | } | |
1632 | ||
1633 | int lttng_session_track_id(struct lttng_session *session, | |
1634 | enum tracker_type tracker_type, int id) | |
1635 | { | |
1636 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1637 | int ret; |
1638 | ||
d1f652f8 MD |
1639 | tracker = get_tracker(session, tracker_type); |
1640 | if (!tracker) | |
1641 | return -EINVAL; | |
1642 | if (id < -1) | |
e0130fab MD |
1643 | return -EINVAL; |
1644 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1645 | if (id == -1) { |
1646 | /* track all ids: destroy tracker. */ | |
1647 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1648 | ret = 0; |
1649 | } else { | |
d1f652f8 | 1650 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1651 | } |
e0130fab MD |
1652 | mutex_unlock(&sessions_mutex); |
1653 | return ret; | |
1654 | } | |
1655 | ||
d1f652f8 MD |
1656 | int lttng_session_untrack_id(struct lttng_session *session, |
1657 | enum tracker_type tracker_type, int id) | |
e0130fab | 1658 | { |
d1f652f8 | 1659 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1660 | int ret; |
1661 | ||
d1f652f8 MD |
1662 | tracker = get_tracker(session, tracker_type); |
1663 | if (!tracker) | |
1664 | return -EINVAL; | |
1665 | if (id < -1) | |
e0130fab MD |
1666 | return -EINVAL; |
1667 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1668 | if (id == -1) { |
1669 | /* untrack all ids: replace by empty tracker. */ | |
1670 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1671 | } else { |
d1f652f8 | 1672 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1673 | } |
e0130fab MD |
1674 | mutex_unlock(&sessions_mutex); |
1675 | return ret; | |
1676 | } | |
1677 | ||
7e6f9ef6 | 1678 | static |
d1f652f8 | 1679 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1680 | { |
d1f652f8 MD |
1681 | struct lttng_id_tracker *id_tracker = m->private; |
1682 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1683 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1684 | int iter = 0, i; |
1685 | ||
1686 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1687 | if (id_tracker_p) { |
1688 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1689 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1690 | |
f934e302 | 1691 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1692 | if (iter++ >= *pos) |
1693 | return e; | |
1694 | } | |
1695 | } | |
1696 | } else { | |
d1f652f8 | 1697 | /* ID tracker disabled. */ |
7e6f9ef6 | 1698 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1699 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1700 | } |
1701 | iter++; | |
1702 | } | |
1703 | /* End of list */ | |
1704 | return NULL; | |
1705 | } | |
1706 | ||
1707 | /* Called with sessions_mutex held. */ | |
1708 | static | |
d1f652f8 | 1709 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1710 | { |
d1f652f8 MD |
1711 | struct lttng_id_tracker *id_tracker = m->private; |
1712 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1713 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1714 | int iter = 0, i; |
1715 | ||
1716 | (*ppos)++; | |
d1f652f8 MD |
1717 | if (id_tracker_p) { |
1718 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1719 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1720 | |
f934e302 | 1721 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1722 | if (iter++ >= *ppos) |
1723 | return e; | |
1724 | } | |
1725 | } | |
1726 | } else { | |
d1f652f8 | 1727 | /* ID tracker disabled. */ |
7e6f9ef6 | 1728 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1729 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1730 | iter++; |
1731 | } | |
1732 | ||
1733 | /* End of list */ | |
1734 | return NULL; | |
1735 | } | |
1736 | ||
1737 | static | |
d1f652f8 | 1738 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1739 | { |
1740 | mutex_unlock(&sessions_mutex); | |
1741 | } | |
1742 | ||
1743 | static | |
d1f652f8 | 1744 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1745 | { |
d1f652f8 MD |
1746 | struct lttng_id_tracker *id_tracker = m->private; |
1747 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1748 | int id; | |
7e6f9ef6 | 1749 | |
d1f652f8 | 1750 | if (p == id_tracker_p) { |
7e6f9ef6 | 1751 | /* Tracker disabled. */ |
d1f652f8 | 1752 | id = -1; |
7e6f9ef6 | 1753 | } else { |
d1f652f8 | 1754 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1755 | |
d1f652f8 MD |
1756 | id = lttng_id_tracker_get_node_id(e); |
1757 | } | |
1758 | switch (id_tracker->tracker_type) { | |
1759 | case TRACKER_PID: | |
1760 | seq_printf(m, "process { pid = %d; };\n", id); | |
1761 | break; | |
1762 | case TRACKER_VPID: | |
1763 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1764 | break; | |
1765 | case TRACKER_UID: | |
1766 | seq_printf(m, "user { uid = %d; };\n", id); | |
1767 | break; | |
1768 | case TRACKER_VUID: | |
1769 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1770 | break; | |
1771 | case TRACKER_GID: | |
1772 | seq_printf(m, "group { gid = %d; };\n", id); | |
1773 | break; | |
1774 | case TRACKER_VGID: | |
1775 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1776 | break; | |
1777 | default: | |
1778 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1779 | } |
7e6f9ef6 MD |
1780 | return 0; |
1781 | } | |
1782 | ||
1783 | static | |
d1f652f8 MD |
1784 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1785 | .start = id_list_start, | |
1786 | .next = id_list_next, | |
1787 | .stop = id_list_stop, | |
1788 | .show = id_list_show, | |
7e6f9ef6 MD |
1789 | }; |
1790 | ||
1791 | static | |
d1f652f8 | 1792 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1793 | { |
d1f652f8 | 1794 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1795 | } |
1796 | ||
1797 | static | |
d1f652f8 | 1798 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1799 | { |
1800 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1801 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1802 | int ret; |
1803 | ||
d1f652f8 | 1804 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1805 | ret = seq_release(inode, file); |
d1f652f8 MD |
1806 | if (!ret) |
1807 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1808 | return ret; |
1809 | } | |
1810 | ||
d1f652f8 | 1811 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1812 | .owner = THIS_MODULE, |
d1f652f8 | 1813 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1814 | .read = seq_read, |
1815 | .llseek = seq_lseek, | |
d1f652f8 | 1816 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1817 | }; |
1818 | ||
d1f652f8 MD |
1819 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1820 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1821 | { |
d1f652f8 | 1822 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1823 | struct seq_file *m; |
1824 | int file_fd, ret; | |
1825 | ||
1826 | file_fd = lttng_get_unused_fd(); | |
1827 | if (file_fd < 0) { | |
1828 | ret = file_fd; | |
1829 | goto fd_error; | |
1830 | } | |
1831 | ||
d1f652f8 MD |
1832 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1833 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1834 | NULL, O_RDWR); |
d1f652f8 MD |
1835 | if (IS_ERR(tracker_ids_list_file)) { |
1836 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1837 | goto file_error; |
1838 | } | |
98d7281c MJ |
1839 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1840 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1841 | goto refcount_error; |
1842 | } | |
d1f652f8 | 1843 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1844 | if (ret < 0) |
1845 | goto open_error; | |
d1f652f8 MD |
1846 | m = tracker_ids_list_file->private_data; |
1847 | ||
1848 | m->private = get_tracker(session, tracker_type); | |
1849 | BUG_ON(!m->private); | |
1850 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1851 | |
1852 | return file_fd; | |
1853 | ||
1854 | open_error: | |
9c1f4643 MD |
1855 | atomic_long_dec(&session->file->f_count); |
1856 | refcount_error: | |
d1f652f8 | 1857 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1858 | file_error: |
1859 | put_unused_fd(file_fd); | |
1860 | fd_error: | |
1861 | return ret; | |
1862 | } | |
1863 | ||
3c997079 MD |
1864 | /* |
1865 | * Enabler management. | |
1866 | */ | |
1867 | static | |
4993071a PP |
1868 | int lttng_match_enabler_star_glob(const char *desc_name, |
1869 | const char *pattern) | |
3c997079 | 1870 | { |
cbc19040 MD |
1871 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1872 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1873 | return 0; |
1874 | return 1; | |
1875 | } | |
1876 | ||
1877 | static | |
4ecb5ad5 MD |
1878 | int lttng_match_enabler_name(const char *desc_name, |
1879 | const char *name) | |
3c997079 | 1880 | { |
4ecb5ad5 | 1881 | if (strcmp(desc_name, name)) |
3c997079 MD |
1882 | return 0; |
1883 | return 1; | |
1884 | } | |
1885 | ||
3c997079 MD |
1886 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1887 | struct lttng_enabler *enabler) | |
1888 | { | |
4ecb5ad5 | 1889 | const char *desc_name, *enabler_name; |
badfe9f5 | 1890 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1891 | |
1892 | enabler_name = enabler->event_param.name; | |
1893 | switch (enabler->event_param.instrumentation) { | |
1894 | case LTTNG_KERNEL_TRACEPOINT: | |
1895 | desc_name = desc->name; | |
3b861b22 FD |
1896 | switch (enabler->format_type) { |
1897 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1898 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1899 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1900 | return lttng_match_enabler_name(desc_name, enabler_name); |
1901 | default: | |
1902 | return -EINVAL; | |
1903 | } | |
4ecb5ad5 | 1904 | break; |
b4a75708 | 1905 | |
4ecb5ad5 MD |
1906 | case LTTNG_KERNEL_SYSCALL: |
1907 | desc_name = desc->name; | |
badfe9f5 | 1908 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1909 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1910 | compat = true; |
1911 | } | |
4ecb5ad5 MD |
1912 | if (!strncmp(desc_name, "syscall_exit_", |
1913 | strlen("syscall_exit_"))) { | |
1914 | desc_name += strlen("syscall_exit_"); | |
1915 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1916 | strlen("syscall_entry_"))) { | |
1917 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1918 | entry = true; |
4ecb5ad5 MD |
1919 | } else { |
1920 | WARN_ON_ONCE(1); | |
1921 | return -EINVAL; | |
1922 | } | |
badfe9f5 MD |
1923 | switch (enabler->event_param.u.syscall.entryexit) { |
1924 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1925 | break; | |
1926 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1927 | if (!entry) | |
1928 | return 0; | |
1929 | break; | |
1930 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1931 | if (entry) | |
1932 | return 0; | |
1933 | break; | |
1934 | default: | |
1935 | return -EINVAL; | |
1936 | } | |
1937 | switch (enabler->event_param.u.syscall.abi) { | |
1938 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1939 | break; | |
1940 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1941 | if (compat) | |
1942 | return 0; | |
1943 | break; | |
1944 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1945 | if (!compat) | |
1946 | return 0; | |
1947 | break; | |
1948 | default: | |
1949 | return -EINVAL; | |
1950 | } | |
1951 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1952 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1953 | switch (enabler->format_type) { |
1954 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1955 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1956 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1957 | return lttng_match_enabler_name(desc_name, enabler_name); |
1958 | default: | |
1959 | return -EINVAL; | |
1960 | } | |
1961 | break; | |
cff6938b | 1962 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1963 | return -EINVAL; /* Not implemented. */ |
1964 | default: | |
1965 | return -EINVAL; | |
1966 | } | |
4ecb5ad5 | 1967 | break; |
b4a75708 | 1968 | |
4ecb5ad5 MD |
1969 | default: |
1970 | WARN_ON_ONCE(1); | |
1971 | return -EINVAL; | |
1972 | } | |
3c997079 MD |
1973 | } |
1974 | ||
1975 | static | |
b2bc0bc8 FD |
1976 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1977 | struct lttng_event *event) | |
3c997079 | 1978 | { |
b2bc0bc8 FD |
1979 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1980 | event_enabler); | |
1981 | ||
1982 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1983 | return 0; |
b2bc0bc8 FD |
1984 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1985 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1986 | return 1; |
1987 | else | |
1988 | return 0; | |
1989 | } | |
1990 | ||
b01155ba FD |
1991 | static |
1992 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1993 | struct lttng_event_notifier *event_notifier) | |
1994 | { | |
1995 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1996 | event_notifier_enabler); | |
1997 | ||
1998 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1999 | return 0; | |
2000 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
2001 | && event_notifier->group == event_notifier_enabler->group | |
2002 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2003 | return 1; | |
2004 | else | |
2005 | return 0; | |
2006 | } | |
2007 | ||
3c997079 | 2008 | static |
b2bc0bc8 FD |
2009 | struct lttng_enabler_ref *lttng_enabler_ref( |
2010 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2011 | struct lttng_enabler *enabler) |
2012 | { | |
2013 | struct lttng_enabler_ref *enabler_ref; | |
2014 | ||
b2bc0bc8 | 2015 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2016 | if (enabler_ref->ref == enabler) |
2017 | return enabler_ref; | |
2018 | } | |
2019 | return NULL; | |
2020 | } | |
2021 | ||
3c997079 | 2022 | static |
1b917d6b | 2023 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2024 | { |
b2bc0bc8 | 2025 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
2026 | struct lttng_probe_desc *probe_desc; |
2027 | const struct lttng_event_desc *desc; | |
2028 | int i; | |
2029 | struct list_head *probe_list; | |
2030 | ||
2031 | probe_list = lttng_get_probe_list_head(); | |
2032 | /* | |
2033 | * For each probe event, if we find that a probe event matches | |
2034 | * our enabler, create an associated lttng_event if not | |
2035 | * already present. | |
2036 | */ | |
2037 | list_for_each_entry(probe_desc, probe_list, head) { | |
2038 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2039 | int found = 0; | |
2040 | struct hlist_head *head; | |
3c997079 MD |
2041 | struct lttng_event *event; |
2042 | ||
2043 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2044 | if (!lttng_desc_match_enabler(desc, |
2045 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2046 | continue; |
3c997079 MD |
2047 | |
2048 | /* | |
2049 | * Check if already created. | |
2050 | */ | |
4a11ef1c FD |
2051 | head = utils_borrow_hash_table_bucket( |
2052 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
2053 | desc->name); | |
d216ecae | 2054 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 2055 | if (event->desc == desc |
b2bc0bc8 | 2056 | && event->chan == event_enabler->chan) |
3c997079 MD |
2057 | found = 1; |
2058 | } | |
2059 | if (found) | |
2060 | continue; | |
2061 | ||
2062 | /* | |
2063 | * We need to create an event for this | |
2064 | * event probe. | |
2065 | */ | |
b2bc0bc8 | 2066 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
2067 | NULL, NULL, desc, |
2068 | LTTNG_KERNEL_TRACEPOINT); | |
2069 | if (!event) { | |
5a15f70c | 2070 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
2071 | probe_desc->event_desc[i]->name); |
2072 | } | |
2073 | } | |
2074 | } | |
2075 | } | |
2076 | ||
b01155ba FD |
2077 | static |
2078 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2079 | { | |
2080 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2081 | struct lttng_probe_desc *probe_desc; | |
2082 | const struct lttng_event_desc *desc; | |
2083 | int i; | |
2084 | struct list_head *probe_list; | |
2085 | ||
2086 | probe_list = lttng_get_probe_list_head(); | |
2087 | /* | |
2088 | * For each probe event, if we find that a probe event matches | |
2089 | * our enabler, create an associated lttng_event_notifier if not | |
2090 | * already present. | |
2091 | */ | |
2092 | list_for_each_entry(probe_desc, probe_list, head) { | |
2093 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2094 | int found = 0; | |
2095 | struct hlist_head *head; | |
2096 | struct lttng_event_notifier *event_notifier; | |
2097 | ||
2098 | desc = probe_desc->event_desc[i]; | |
2099 | if (!lttng_desc_match_enabler(desc, | |
2100 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2101 | continue; | |
2102 | ||
2103 | /* | |
2104 | * Check if already created. | |
2105 | */ | |
2106 | head = utils_borrow_hash_table_bucket( | |
2107 | event_notifier_group->event_notifiers_ht.table, | |
2108 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
2109 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
2110 | if (event_notifier->desc == desc | |
2111 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2112 | found = 1; | |
2113 | } | |
2114 | if (found) | |
2115 | continue; | |
2116 | ||
2117 | /* | |
2118 | * We need to create a event_notifier for this event probe. | |
2119 | */ | |
2120 | event_notifier = _lttng_event_notifier_create(desc, | |
2121 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2122 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2123 | event_notifier_group, NULL, NULL, |
2124 | LTTNG_KERNEL_TRACEPOINT); | |
2125 | if (IS_ERR(event_notifier)) { | |
2126 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
2127 | probe_desc->event_desc[i]->name); | |
2128 | } | |
2129 | } | |
2130 | } | |
2131 | } | |
2132 | ||
33a39a3c | 2133 | static |
1b917d6b | 2134 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2135 | { |
2136 | int ret; | |
2137 | ||
3b82c4e1 | 2138 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2139 | WARN_ON_ONCE(ret); |
2140 | } | |
2141 | ||
8a8ac9a8 FD |
2142 | static |
2143 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2144 | { | |
2145 | int ret; | |
2146 | ||
2147 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2148 | WARN_ON_ONCE(ret); | |
2149 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2150 | WARN_ON_ONCE(ret); | |
2151 | } | |
2152 | ||
33a39a3c MD |
2153 | /* |
2154 | * Create struct lttng_event if it is missing and present in the list of | |
2155 | * tracepoint probes. | |
2156 | * Should be called with sessions mutex held. | |
2157 | */ | |
2158 | static | |
b2bc0bc8 | 2159 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2160 | { |
b2bc0bc8 | 2161 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2162 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2163 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2164 | break; |
b4a75708 | 2165 | |
33a39a3c | 2166 | case LTTNG_KERNEL_SYSCALL: |
1b917d6b | 2167 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2168 | break; |
b4a75708 | 2169 | |
33a39a3c MD |
2170 | default: |
2171 | WARN_ON_ONCE(1); | |
2172 | break; | |
2173 | } | |
2174 | } | |
2175 | ||
3c997079 | 2176 | /* |
b2bc0bc8 | 2177 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2178 | * and add backward reference from the event to the enabler. |
2179 | * Should be called with sessions mutex held. | |
2180 | */ | |
2181 | static | |
b2bc0bc8 | 2182 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2183 | { |
b2bc0bc8 FD |
2184 | struct lttng_channel *chan = event_enabler->chan; |
2185 | struct lttng_session *session = event_enabler->chan->session; | |
2186 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2187 | struct lttng_event *event; |
2188 | ||
b2bc0bc8 | 2189 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2190 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2191 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2192 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2193 | int enabled = base_enabler->enabled; |
2194 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2195 | ||
2196 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2197 | WRITE_ONCE(chan->syscall_all_entry, enabled); | |
2198 | ||
2199 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2200 | WRITE_ONCE(chan->syscall_all_exit, enabled); | |
badfe9f5 MD |
2201 | } |
2202 | ||
3c997079 | 2203 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2204 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2205 | |
b2bc0bc8 | 2206 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2207 | list_for_each_entry(event, &session->events, list) { |
2208 | struct lttng_enabler_ref *enabler_ref; | |
2209 | ||
b2bc0bc8 | 2210 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2211 | continue; |
b2bc0bc8 FD |
2212 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2213 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2214 | if (!enabler_ref) { |
2215 | /* | |
2216 | * If no backward ref, create it. | |
b2bc0bc8 | 2217 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2218 | */ |
2219 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2220 | if (!enabler_ref) | |
2221 | return -ENOMEM; | |
b2bc0bc8 | 2222 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2223 | list_add(&enabler_ref->node, |
2224 | &event->enablers_ref_head); | |
2225 | } | |
2226 | ||
f127e61e MD |
2227 | /* |
2228 | * Link filter bytecodes if not linked yet. | |
2229 | */ | |
2dfda770 FD |
2230 | lttng_enabler_link_bytecode(event->desc, |
2231 | lttng_static_ctx, | |
183e8b3a | 2232 | &event->filter_bytecode_runtime_head, |
60206944 | 2233 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2234 | |
3c997079 MD |
2235 | /* TODO: merge event context. */ |
2236 | } | |
2237 | return 0; | |
2238 | } | |
2239 | ||
b01155ba FD |
2240 | /* |
2241 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2242 | * tracepoint probes. | |
2243 | * Should be called with sessions mutex held. | |
2244 | */ | |
2245 | static | |
2246 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2247 | { | |
2248 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2249 | case LTTNG_KERNEL_TRACEPOINT: | |
2250 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2251 | break; | |
b4a75708 | 2252 | |
8a8ac9a8 FD |
2253 | case LTTNG_KERNEL_SYSCALL: |
2254 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2255 | break; | |
b4a75708 | 2256 | |
b01155ba FD |
2257 | default: |
2258 | WARN_ON_ONCE(1); | |
2259 | break; | |
2260 | } | |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2265 | */ | |
2266 | static | |
8a8ac9a8 FD |
2267 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2268 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2269 | { |
2270 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2271 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2272 | struct lttng_event_notifier *event_notifier; |
2273 | ||
8a8ac9a8 FD |
2274 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2275 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2276 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2277 | !strcmp(base_enabler->event_param.name, "*")) { | |
2278 | ||
2279 | int enabled = base_enabler->enabled; | |
2280 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2281 | ||
2282 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2283 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2284 | ||
2285 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2286 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2287 | ||
2288 | } | |
2289 | ||
b01155ba FD |
2290 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2291 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2292 | ||
2293 | /* Link the created event_notifier with its associated enabler. */ | |
2294 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2295 | struct lttng_enabler_ref *enabler_ref; | |
2296 | ||
2297 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2298 | continue; | |
2299 | ||
2300 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2301 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2302 | if (!enabler_ref) { | |
2303 | /* | |
2304 | * If no backward ref, create it. | |
2305 | * Add backward ref from event_notifier to enabler. | |
2306 | */ | |
2307 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2308 | if (!enabler_ref) | |
2309 | return -ENOMEM; | |
2310 | ||
2311 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2312 | event_notifier_enabler); | |
2313 | list_add(&enabler_ref->node, | |
2314 | &event_notifier->enablers_ref_head); | |
2315 | } | |
2316 | ||
2317 | /* | |
2318 | * Link filter bytecodes if not linked yet. | |
2319 | */ | |
2320 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2321 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2322 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2323 | |
2324 | /* Link capture bytecodes if not linked yet. */ | |
2325 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2326 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2327 | &event_notifier_enabler->capture_bytecode_head); | |
2328 | ||
2329 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2330 | } |
2331 | return 0; | |
2332 | } | |
2333 | ||
3c997079 MD |
2334 | /* |
2335 | * Called at module load: connect the probe on all enablers matching | |
2336 | * this event. | |
2337 | * Called with sessions lock held. | |
2338 | */ | |
2339 | int lttng_fix_pending_events(void) | |
2340 | { | |
2341 | struct lttng_session *session; | |
2342 | ||
2343 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2344 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2345 | return 0; |
2346 | } | |
2347 | ||
b01155ba FD |
2348 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2349 | struct lttng_event_notifier_group *event_notifier_group) | |
2350 | { | |
2351 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2352 | ||
2353 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2354 | node) { | |
2355 | if (event_notifier_enabler->base.enabled) | |
2356 | return true; | |
2357 | } | |
2358 | return false; | |
2359 | } | |
2360 | ||
2361 | bool lttng_event_notifier_active(void) | |
2362 | { | |
2363 | struct lttng_event_notifier_group *event_notifier_group; | |
2364 | ||
2365 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2366 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2367 | return true; | |
2368 | } | |
2369 | return false; | |
2370 | } | |
2371 | ||
2372 | int lttng_fix_pending_event_notifiers(void) | |
2373 | { | |
2374 | struct lttng_event_notifier_group *event_notifier_group; | |
2375 | ||
2376 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2377 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2378 | return 0; | |
2379 | } | |
2380 | ||
b2bc0bc8 FD |
2381 | struct lttng_event_enabler *lttng_event_enabler_create( |
2382 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2383 | struct lttng_kernel_event *event_param, |
2384 | struct lttng_channel *chan) | |
2385 | { | |
b2bc0bc8 | 2386 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2387 | |
b2bc0bc8 FD |
2388 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2389 | if (!event_enabler) | |
3c997079 | 2390 | return NULL; |
b2bc0bc8 FD |
2391 | event_enabler->base.format_type = format_type; |
2392 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2393 | memcpy(&event_enabler->base.event_param, event_param, | |
2394 | sizeof(event_enabler->base.event_param)); | |
2395 | event_enabler->chan = chan; | |
3c997079 | 2396 | /* ctx left NULL */ |
b2bc0bc8 FD |
2397 | event_enabler->base.enabled = 0; |
2398 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2399 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2400 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2401 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2402 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2403 | return event_enabler; |
3c997079 MD |
2404 | } |
2405 | ||
b2bc0bc8 | 2406 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2407 | { |
2408 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2409 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2410 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2411 | mutex_unlock(&sessions_mutex); |
2412 | return 0; | |
2413 | } | |
2414 | ||
b2bc0bc8 | 2415 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2416 | { |
2417 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2418 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2419 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2420 | mutex_unlock(&sessions_mutex); |
2421 | return 0; | |
2422 | } | |
2423 | ||
b2bc0bc8 | 2424 | static |
183e8b3a | 2425 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2426 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2427 | { | |
89ec2b91 | 2428 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2429 | uint32_t bytecode_len; |
2430 | int ret; | |
2431 | ||
2432 | ret = get_user(bytecode_len, &bytecode->len); | |
2433 | if (ret) | |
2434 | return ret; | |
52cfcdf3 | 2435 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2436 | GFP_KERNEL); |
2437 | if (!bytecode_node) | |
2438 | return -ENOMEM; | |
2439 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2440 | sizeof(*bytecode) + bytecode_len); | |
2441 | if (ret) | |
2442 | goto error_free; | |
b2bc0bc8 | 2443 | |
89ec2b91 | 2444 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2445 | bytecode_node->enabler = enabler; |
2446 | /* Enforce length based on allocated size */ | |
2447 | bytecode_node->bc.len = bytecode_len; | |
2448 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2449 | |
07dfc1d0 MD |
2450 | return 0; |
2451 | ||
2452 | error_free: | |
52cfcdf3 | 2453 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2454 | return ret; |
2455 | } | |
2456 | ||
183e8b3a | 2457 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2458 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2459 | { | |
2460 | int ret; | |
183e8b3a | 2461 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2462 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2463 | if (ret) | |
2464 | goto error; | |
2465 | ||
2466 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2467 | return 0; | |
2468 | ||
2469 | error: | |
2470 | return ret; | |
2471 | } | |
2472 | ||
3aed4dca FD |
2473 | int lttng_event_add_callsite(struct lttng_event *event, |
2474 | struct lttng_kernel_event_callsite __user *callsite) | |
2475 | { | |
2476 | ||
2477 | switch (event->instrumentation) { | |
2478 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2479 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2480 | default: |
2481 | return -EINVAL; | |
2482 | } | |
2483 | } | |
2484 | ||
b2bc0bc8 | 2485 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2486 | struct lttng_kernel_context *context_param) |
2487 | { | |
2488 | return -ENOSYS; | |
2489 | } | |
2490 | ||
2491 | static | |
2492 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2493 | { | |
89ec2b91 | 2494 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2495 | |
2496 | /* Destroy filter bytecode */ | |
2497 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2498 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2499 | lttng_kvfree(filter_node); |
07dfc1d0 | 2500 | } |
b2bc0bc8 FD |
2501 | } |
2502 | ||
2503 | static | |
2504 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2505 | { | |
2506 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2507 | |
3c997079 | 2508 | /* Destroy contexts */ |
b2bc0bc8 | 2509 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2510 | |
b2bc0bc8 FD |
2511 | list_del(&event_enabler->node); |
2512 | kfree(event_enabler); | |
3c997079 MD |
2513 | } |
2514 | ||
dffef45d FD |
2515 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2516 | struct lttng_event_notifier_group *event_notifier_group, | |
2517 | enum lttng_enabler_format_type format_type, | |
2518 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2519 | { | |
2520 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2521 | ||
2522 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2523 | if (!event_notifier_enabler) | |
2524 | return NULL; | |
2525 | ||
2526 | event_notifier_enabler->base.format_type = format_type; | |
2527 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2528 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2529 | ||
99f52fcc | 2530 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2531 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2532 | |
8a8ac9a8 FD |
2533 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2534 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2535 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2536 | ||
2537 | event_notifier_enabler->base.enabled = 0; | |
2538 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2539 | event_notifier_enabler->group = event_notifier_group; | |
2540 | ||
2541 | mutex_lock(&sessions_mutex); | |
2542 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2543 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2544 | |
2545 | mutex_unlock(&sessions_mutex); | |
2546 | ||
2547 | return event_notifier_enabler; | |
2548 | } | |
2549 | ||
2550 | int lttng_event_notifier_enabler_enable( | |
2551 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2552 | { | |
2553 | mutex_lock(&sessions_mutex); | |
2554 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2555 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2556 | mutex_unlock(&sessions_mutex); |
2557 | return 0; | |
2558 | } | |
2559 | ||
2560 | int lttng_event_notifier_enabler_disable( | |
2561 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2562 | { | |
2563 | mutex_lock(&sessions_mutex); | |
2564 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2565 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2566 | mutex_unlock(&sessions_mutex); |
2567 | return 0; | |
2568 | } | |
2569 | ||
183e8b3a | 2570 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2571 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2572 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2573 | { | |
2574 | int ret; | |
2575 | ||
183e8b3a | 2576 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2577 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2578 | bytecode); | |
2579 | if (ret) | |
2580 | goto error; | |
2581 | ||
b01155ba | 2582 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2583 | return 0; |
2584 | ||
2585 | error: | |
2586 | return ret; | |
2587 | } | |
2588 | ||
99d223ad FD |
2589 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2590 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2591 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2592 | { | |
2593 | struct lttng_bytecode_node *bytecode_node; | |
2594 | struct lttng_enabler *enabler = | |
2595 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2596 | uint32_t bytecode_len; | |
2597 | int ret; | |
2598 | ||
2599 | ret = get_user(bytecode_len, &bytecode->len); | |
2600 | if (ret) | |
2601 | return ret; | |
2602 | ||
2603 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2604 | GFP_KERNEL); | |
2605 | if (!bytecode_node) | |
2606 | return -ENOMEM; | |
2607 | ||
2608 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2609 | sizeof(*bytecode) + bytecode_len); | |
2610 | if (ret) | |
2611 | goto error_free; | |
2612 | ||
2613 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2614 | bytecode_node->enabler = enabler; | |
2615 | ||
2616 | /* Enforce length based on allocated size */ | |
2617 | bytecode_node->bc.len = bytecode_len; | |
2618 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2619 | ||
2620 | event_notifier_enabler->num_captures++; | |
2621 | ||
2622 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2623 | goto end; | |
2624 | ||
2625 | error_free: | |
2626 | lttng_kvfree(bytecode_node); | |
2627 | end: | |
2628 | return ret; | |
2629 | } | |
2630 | ||
9de67196 FD |
2631 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2632 | struct lttng_kernel_event_callsite __user *callsite) | |
2633 | { | |
2634 | ||
2635 | switch (event_notifier->instrumentation) { | |
2636 | case LTTNG_KERNEL_UPROBE: | |
2637 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2638 | callsite); | |
2639 | default: | |
2640 | return -EINVAL; | |
2641 | } | |
2642 | } | |
2643 | ||
dffef45d FD |
2644 | int lttng_event_notifier_enabler_attach_context( |
2645 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2646 | struct lttng_kernel_context *context_param) | |
2647 | { | |
2648 | return -ENOSYS; | |
2649 | } | |
2650 | ||
2651 | static | |
2652 | void lttng_event_notifier_enabler_destroy( | |
2653 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2654 | { | |
2655 | if (!event_notifier_enabler) { | |
2656 | return; | |
2657 | } | |
2658 | ||
2659 | list_del(&event_notifier_enabler->node); | |
2660 | ||
2661 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2662 | kfree(event_notifier_enabler); | |
2663 | } | |
2664 | ||
3c997079 | 2665 | /* |
b2bc0bc8 | 2666 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2667 | * session. |
2668 | * Should be called with sessions mutex held. | |
2669 | */ | |
2670 | static | |
b2bc0bc8 | 2671 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2672 | { |
b2bc0bc8 | 2673 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2674 | struct lttng_event *event; |
2675 | ||
b2bc0bc8 FD |
2676 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2677 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2678 | /* |
2679 | * For each event, if at least one of its enablers is enabled, | |
2680 | * and its channel and session transient states are enabled, we | |
2681 | * enable the event, else we disable it. | |
2682 | */ | |
2683 | list_for_each_entry(event, &session->events, list) { | |
2684 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2685 | struct lttng_bytecode_runtime *runtime; |
2686 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2687 | |
4ecb5ad5 | 2688 | switch (event->instrumentation) { |
b4a75708 | 2689 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
4ecb5ad5 | 2690 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
2691 | /* Enable events */ |
2692 | list_for_each_entry(enabler_ref, | |
2693 | &event->enablers_ref_head, node) { | |
2694 | if (enabler_ref->ref->enabled) { | |
2695 | enabled = 1; | |
2696 | break; | |
2697 | } | |
2698 | } | |
4ecb5ad5 | 2699 | break; |
b4a75708 | 2700 | |
4ecb5ad5 | 2701 | default: |
3c997079 MD |
2702 | /* Not handled with lazy sync. */ |
2703 | continue; | |
2704 | } | |
2705 | /* | |
2706 | * Enabled state is based on union of enablers, with | |
2707 | * intesection of session and channel transient enable | |
2708 | * states. | |
2709 | */ | |
2710 | enabled = enabled && session->tstate && event->chan->tstate; | |
2711 | ||
a8f2d0c7 | 2712 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2713 | /* |
2714 | * Sync tracepoint registration with event enabled | |
2715 | * state. | |
2716 | */ | |
2717 | if (enabled) { | |
2718 | register_event(event); | |
2719 | } else { | |
2720 | _lttng_event_unregister(event); | |
2721 | } | |
07dfc1d0 MD |
2722 | |
2723 | /* Check if has enablers without bytecode enabled */ | |
2724 | list_for_each_entry(enabler_ref, | |
2725 | &event->enablers_ref_head, node) { | |
2726 | if (enabler_ref->ref->enabled | |
2727 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2728 | has_enablers_without_bytecode = 1; | |
2729 | break; | |
2730 | } | |
2731 | } | |
2732 | event->has_enablers_without_bytecode = | |
2733 | has_enablers_without_bytecode; | |
2734 | ||
2735 | /* Enable filters */ | |
2736 | list_for_each_entry(runtime, | |
183e8b3a | 2737 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2738 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2739 | } |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * Apply enablers to session events, adding events to session if need | |
2744 | * be. It is required after each modification applied to an active | |
2745 | * session, and right before session "start". | |
2746 | * "lazy" sync means we only sync if required. | |
2747 | * Should be called with sessions mutex held. | |
2748 | */ | |
2749 | static | |
b2bc0bc8 | 2750 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2751 | { |
2752 | /* We can skip if session is not active */ | |
2753 | if (!session->active) | |
2754 | return; | |
b2bc0bc8 | 2755 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2756 | } |
2757 | ||
b01155ba FD |
2758 | static |
2759 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2760 | { | |
2761 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2762 | struct lttng_event_notifier *event_notifier; | |
2763 | ||
2764 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2765 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2766 | ||
2767 | /* | |
2768 | * For each event_notifier, if at least one of its enablers is enabled, | |
2769 | * we enable the event_notifier, else we disable it. | |
2770 | */ | |
2771 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2772 | struct lttng_enabler_ref *enabler_ref; | |
2773 | struct lttng_bytecode_runtime *runtime; | |
2774 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2775 | ||
2776 | switch (event_notifier->instrumentation) { | |
b4a75708 | 2777 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
b01155ba FD |
2778 | case LTTNG_KERNEL_SYSCALL: |
2779 | /* Enable event_notifiers */ | |
2780 | list_for_each_entry(enabler_ref, | |
2781 | &event_notifier->enablers_ref_head, node) { | |
2782 | if (enabler_ref->ref->enabled) { | |
2783 | enabled = 1; | |
2784 | break; | |
2785 | } | |
2786 | } | |
2787 | break; | |
b4a75708 | 2788 | |
b01155ba FD |
2789 | default: |
2790 | /* Not handled with sync. */ | |
2791 | continue; | |
2792 | } | |
2793 | ||
2794 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2795 | /* | |
2796 | * Sync tracepoint registration with event_notifier enabled | |
2797 | * state. | |
2798 | */ | |
2799 | if (enabled) { | |
2800 | if (!event_notifier->registered) | |
2801 | register_event_notifier(event_notifier); | |
2802 | } else { | |
2803 | if (event_notifier->registered) | |
2804 | _lttng_event_notifier_unregister(event_notifier); | |
2805 | } | |
2806 | ||
2807 | /* Check if has enablers without bytecode enabled */ | |
2808 | list_for_each_entry(enabler_ref, | |
2809 | &event_notifier->enablers_ref_head, node) { | |
2810 | if (enabler_ref->ref->enabled | |
2811 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2812 | has_enablers_without_bytecode = 1; | |
2813 | break; | |
2814 | } | |
2815 | } | |
2816 | event_notifier->has_enablers_without_bytecode = | |
2817 | has_enablers_without_bytecode; | |
2818 | ||
2819 | /* Enable filters */ | |
2820 | list_for_each_entry(runtime, | |
183e8b3a | 2821 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2822 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2823 | |
2824 | /* Enable captures */ | |
2825 | list_for_each_entry(runtime, | |
2826 | &event_notifier->capture_bytecode_runtime_head, node) | |
2827 | lttng_bytecode_capture_sync_state(runtime); | |
c3eddb2e MD |
2828 | |
2829 | WRITE_ONCE(event_notifier->eval_capture, !!event_notifier->num_captures); | |
b01155ba FD |
2830 | } |
2831 | } | |
2832 | ||
1ec3f75a | 2833 | /* |
d83004aa JD |
2834 | * Serialize at most one packet worth of metadata into a metadata |
2835 | * channel. | |
92d9f5e6 MD |
2836 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2837 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2838 | * allows us to do racy operations such as looking for remaining space left in | |
2839 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2840 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2841 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2842 | * Returns the number of bytes written in the channel, 0 if no data |
2843 | * was written and a negative value on error. | |
1ec3f75a | 2844 | */ |
b3b8072b | 2845 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2846 | struct channel *chan, bool *coherent) |
d83004aa JD |
2847 | { |
2848 | struct lib_ring_buffer_ctx ctx; | |
2849 | int ret = 0; | |
2850 | size_t len, reserve_len; | |
2851 | ||
f613e3e6 | 2852 | /* |
92d9f5e6 MD |
2853 | * Ensure we support mutiple get_next / put sequences followed by |
2854 | * put_next. The metadata cache lock protects reading the metadata | |
2855 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2856 | * "flush" operations on the buffer invoked by different processes. | |
2857 | * Moreover, since the metadata cache memory can be reallocated, we | |
2858 | * need to have exclusive access against updates even though we only | |
2859 | * read it. | |
f613e3e6 | 2860 | */ |
92d9f5e6 | 2861 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2862 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2863 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2864 | goto end; |
f613e3e6 | 2865 | |
9616f0bf JD |
2866 | /* Metadata regenerated, change the version. */ |
2867 | if (stream->metadata_cache->version != stream->version) | |
2868 | stream->version = stream->metadata_cache->version; | |
2869 | ||
d83004aa | 2870 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2871 | stream->metadata_in; |
9de2c215 | 2872 | if (!len) |
de23d59d | 2873 | goto end; |
d83004aa | 2874 | reserve_len = min_t(size_t, |
b3b8072b | 2875 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2876 | len); |
b3b8072b | 2877 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2878 | sizeof(char), -1); |
2879 | /* | |
2880 | * If reservation failed, return an error to the caller. | |
2881 | */ | |
b3b8072b | 2882 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2883 | if (ret != 0) { |
2884 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2885 | stream->coherent = false; |
d83004aa JD |
2886 | goto end; |
2887 | } | |
b3b8072b | 2888 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2889 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2890 | reserve_len); |
b3b8072b | 2891 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2892 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2893 | if (reserve_len < len) |
8b97fd42 MD |
2894 | stream->coherent = false; |
2895 | else | |
2896 | stream->coherent = true; | |
d83004aa JD |
2897 | ret = reserve_len; |
2898 | ||
2899 | end: | |
8b97fd42 MD |
2900 | if (coherent) |
2901 | *coherent = stream->coherent; | |
92d9f5e6 | 2902 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2903 | return ret; |
2904 | } | |
2905 | ||
8b97fd42 MD |
2906 | static |
2907 | void lttng_metadata_begin(struct lttng_session *session) | |
2908 | { | |
3e75e2a7 MD |
2909 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2910 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2911 | } |
2912 | ||
2913 | static | |
2914 | void lttng_metadata_end(struct lttng_session *session) | |
2915 | { | |
3e75e2a7 MD |
2916 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2917 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2918 | struct lttng_metadata_stream *stream; | |
2919 | ||
3e75e2a7 MD |
2920 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2921 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2922 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2923 | } |
8b97fd42 MD |
2924 | } |
2925 | ||
d83004aa JD |
2926 | /* |
2927 | * Write the metadata to the metadata cache. | |
2928 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2929 | * The metadata cache lock protects us from concurrent read access from |
2930 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2931 | * The content of the printf is printed as a single atomic metadata |
2932 | * transaction. | |
d83004aa | 2933 | */ |
a90917c3 | 2934 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2935 | const char *fmt, ...) |
2936 | { | |
c099397a | 2937 | char *str; |
d83004aa | 2938 | size_t len; |
c099397a MD |
2939 | va_list ap; |
2940 | ||
585e5dcc | 2941 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2942 | |
2943 | va_start(ap, fmt); | |
2944 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2945 | va_end(ap); | |
2946 | if (!str) | |
2947 | return -ENOMEM; | |
2948 | ||
1ec3f75a | 2949 | len = strlen(str); |
3e75e2a7 | 2950 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2951 | if (session->metadata_cache->metadata_written + len > |
2952 | session->metadata_cache->cache_alloc) { | |
2953 | char *tmp_cache_realloc; | |
2954 | unsigned int tmp_cache_alloc_size; | |
2955 | ||
2956 | tmp_cache_alloc_size = max_t(unsigned int, | |
2957 | session->metadata_cache->cache_alloc + len, | |
2958 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2959 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2960 | if (!tmp_cache_realloc) |
2961 | goto err; | |
a606b6e8 ML |
2962 | if (session->metadata_cache->data) { |
2963 | memcpy(tmp_cache_realloc, | |
2964 | session->metadata_cache->data, | |
2965 | session->metadata_cache->cache_alloc); | |
2966 | vfree(session->metadata_cache->data); | |
2967 | } | |
2968 | ||
d83004aa JD |
2969 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2970 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2971 | } |
d83004aa JD |
2972 | memcpy(session->metadata_cache->data + |
2973 | session->metadata_cache->metadata_written, | |
2974 | str, len); | |
2975 | session->metadata_cache->metadata_written += len; | |
c099397a | 2976 | kfree(str); |
d83004aa | 2977 | |
d83004aa JD |
2978 | return 0; |
2979 | ||
2980 | err: | |
2981 | kfree(str); | |
2982 | return -ENOMEM; | |
c099397a MD |
2983 | } |
2984 | ||
f513b2bf MD |
2985 | static |
2986 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2987 | { | |
2988 | size_t i; | |
2989 | ||
2990 | for (i = 0; i < nesting; i++) { | |
2991 | int ret; | |
2992 | ||
2993 | ret = lttng_metadata_printf(session, " "); | |
2994 | if (ret) { | |
2995 | return ret; | |
2996 | } | |
2997 | } | |
2998 | return 0; | |
2999 | } | |
3000 | ||
ceabb767 MD |
3001 | static |
3002 | int lttng_field_name_statedump(struct lttng_session *session, | |
3003 | const struct lttng_event_field *field, | |
3004 | size_t nesting) | |
3005 | { | |
3006 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3007 | } | |
3008 | ||
3009 | static | |
3010 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
3011 | const struct lttng_type *type, | |
3012 | size_t nesting) | |
3013 | { | |
3014 | int ret; | |
3015 | ||
12bb2edb | 3016 | WARN_ON_ONCE(type->type != lttng_kernel_type_integer); |
ceabb767 MD |
3017 | ret = print_tabs(session, nesting); |
3018 | if (ret) | |
3019 | return ret; | |
3020 | ret = lttng_metadata_printf(session, | |
3021 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
3022 | type->u.integer.size, | |
3023 | type->u.integer.alignment, | |
3024 | type->u.integer.signedness, | |
3025 | (type->u.integer.encoding == lttng_encode_none) | |
3026 | ? "none" | |
3027 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
3028 | ? "UTF8" | |
3029 | : "ASCII", | |
3030 | type->u.integer.base, | |
3031 | #if __BYTE_ORDER == __BIG_ENDIAN | |
3032 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
3033 | #else | |
3034 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
3035 | #endif | |
3036 | ); | |
3037 | return ret; | |
3038 | } | |
3039 | ||
f513b2bf MD |
3040 | /* |
3041 | * Must be called with sessions_mutex held. | |
3042 | */ | |
3043 | static | |
3044 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
3045 | const struct lttng_type *type, | |
3046 | size_t nesting) | |
3047 | { | |
3048 | int ret; | |
3049 | uint32_t i, nr_fields; | |
ceabb767 MD |
3050 | unsigned int alignment; |
3051 | ||
12bb2edb | 3052 | WARN_ON_ONCE(type->type != lttng_kernel_type_struct_nestable); |
f513b2bf MD |
3053 | |
3054 | ret = print_tabs(session, nesting); | |
3055 | if (ret) | |
3056 | return ret; | |
3057 | ret = lttng_metadata_printf(session, | |
3058 | "struct {\n"); | |
3059 | if (ret) | |
3060 | return ret; | |
ceabb767 | 3061 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
3062 | for (i = 0; i < nr_fields; i++) { |
3063 | const struct lttng_event_field *iter_field; | |
3064 | ||
ceabb767 | 3065 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
3066 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3067 | if (ret) | |
3068 | return ret; | |
3069 | } | |
3070 | ret = print_tabs(session, nesting); | |
3071 | if (ret) | |
3072 | return ret; | |
ceabb767 MD |
3073 | alignment = type->u.struct_nestable.alignment; |
3074 | if (alignment) { | |
3075 | ret = lttng_metadata_printf(session, | |
3076 | "} align(%u)", | |
3077 | alignment); | |
3078 | } else { | |
3079 | ret = lttng_metadata_printf(session, | |
3080 | "}"); | |
3081 | } | |
f513b2bf MD |
3082 | return ret; |
3083 | } | |
3084 | ||
3085 | /* | |
3086 | * Must be called with sessions_mutex held. | |
3087 | */ | |
3088 | static | |
ceabb767 | 3089 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3090 | const struct lttng_event_field *field, |
3091 | size_t nesting) | |
3092 | { | |
3093 | int ret; | |
3094 | ||
3095 | ret = _lttng_struct_type_statedump(session, | |
3096 | &field->type, nesting); | |
3097 | if (ret) | |
3098 | return ret; | |
ceabb767 | 3099 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3100 | } |
3101 | ||
65c85aa6 MD |
3102 | /* |
3103 | * Must be called with sessions_mutex held. | |
3104 | */ | |
3105 | static | |
3106 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
3107 | const struct lttng_type *type, | |
3108 | size_t nesting) | |
3109 | { | |
3110 | int ret; | |
3111 | uint32_t i, nr_choices; | |
3112 | ||
12bb2edb | 3113 | WARN_ON_ONCE(type->type != lttng_kernel_type_variant_nestable); |
ceabb767 MD |
3114 | /* |
3115 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3116 | */ | |
3117 | if (type->u.variant_nestable.alignment != 0) | |
3118 | return -EINVAL; | |
65c85aa6 MD |
3119 | ret = print_tabs(session, nesting); |
3120 | if (ret) | |
3121 | return ret; | |
3122 | ret = lttng_metadata_printf(session, | |
3123 | "variant <_%s> {\n", | |
ceabb767 | 3124 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
3125 | if (ret) |
3126 | return ret; | |
ceabb767 | 3127 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
3128 | for (i = 0; i < nr_choices; i++) { |
3129 | const struct lttng_event_field *iter_field; | |
3130 | ||
ceabb767 | 3131 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
3132 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3133 | if (ret) | |
3134 | return ret; | |
3135 | } | |
3136 | ret = print_tabs(session, nesting); | |
3137 | if (ret) | |
3138 | return ret; | |
3139 | ret = lttng_metadata_printf(session, | |
3140 | "}"); | |
3141 | return ret; | |
3142 | } | |
3143 | ||
3144 | /* | |
3145 | * Must be called with sessions_mutex held. | |
3146 | */ | |
3147 | static | |
ceabb767 | 3148 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3149 | const struct lttng_event_field *field, |
3150 | size_t nesting) | |
3151 | { | |
3152 | int ret; | |
3153 | ||
3154 | ret = _lttng_variant_type_statedump(session, | |
3155 | &field->type, nesting); | |
3156 | if (ret) | |
3157 | return ret; | |
ceabb767 | 3158 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3159 | } |
3160 | ||
f513b2bf MD |
3161 | /* |
3162 | * Must be called with sessions_mutex held. | |
3163 | */ | |
3164 | static | |
ceabb767 | 3165 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3166 | const struct lttng_event_field *field, |
3167 | size_t nesting) | |
3168 | { | |
3169 | int ret; | |
3170 | const struct lttng_type *elem_type; | |
3171 | ||
12bb2edb | 3172 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_array_nestable); |
ceabb767 MD |
3173 | |
3174 | if (field->type.u.array_nestable.alignment) { | |
3175 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3176 | if (ret) |
3177 | return ret; | |
ceabb767 MD |
3178 | ret = lttng_metadata_printf(session, |
3179 | "struct { } align(%u) _%s_padding;\n", | |
3180 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3181 | field->name); | |
3182 | if (ret) | |
3183 | return ret; | |
3184 | } | |
3185 | /* | |
3186 | * Nested compound types: Only array of structures and variants are | |
3187 | * currently supported. | |
3188 | */ | |
3189 | elem_type = field->type.u.array_nestable.elem_type; | |
12bb2edb MD |
3190 | switch (elem_type->type) { |
3191 | case lttng_kernel_type_integer: | |
3192 | case lttng_kernel_type_struct_nestable: | |
3193 | case lttng_kernel_type_variant_nestable: | |
ceabb767 | 3194 | ret = _lttng_type_statedump(session, elem_type, nesting); |
65c85aa6 MD |
3195 | if (ret) |
3196 | return ret; | |
3197 | break; | |
ceabb767 | 3198 | |
f513b2bf MD |
3199 | default: |
3200 | return -EINVAL; | |
3201 | } | |
3202 | ret = lttng_metadata_printf(session, | |
3203 | " _%s[%u];\n", | |
3204 | field->name, | |
ceabb767 | 3205 | field->type.u.array_nestable.length); |
f513b2bf MD |
3206 | return ret; |
3207 | } | |
3208 | ||
3209 | /* | |
3210 | * Must be called with sessions_mutex held. | |
3211 | */ | |
3212 | static | |
ceabb767 | 3213 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3214 | const struct lttng_event_field *field, |
3215 | size_t nesting) | |
3216 | { | |
3217 | int ret; | |
3218 | const char *length_name; | |
3219 | const struct lttng_type *elem_type; | |
3220 | ||
12bb2edb | 3221 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_sequence_nestable); |
f513b2bf | 3222 | |
ceabb767 MD |
3223 | length_name = field->type.u.sequence_nestable.length_name; |
3224 | ||
3225 | if (field->type.u.sequence_nestable.alignment) { | |
3226 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3227 | if (ret) |
3228 | return ret; | |
ceabb767 MD |
3229 | ret = lttng_metadata_printf(session, |
3230 | "struct { } align(%u) _%s_padding;\n", | |
3231 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3232 | field->name); | |
3233 | if (ret) | |
3234 | return ret; | |
3235 | } | |
3236 | ||
3237 | /* | |
3238 | * Nested compound types: Only array of structures and variants are | |
3239 | * currently supported. | |
3240 | */ | |
3241 | elem_type = field->type.u.sequence_nestable.elem_type; | |
12bb2edb MD |
3242 | switch (elem_type->type) { |
3243 | case lttng_kernel_type_integer: | |
3244 | case lttng_kernel_type_struct_nestable: | |
3245 | case lttng_kernel_type_variant_nestable: | |
ceabb767 | 3246 | ret = _lttng_type_statedump(session, elem_type, nesting); |
65c85aa6 MD |
3247 | if (ret) |
3248 | return ret; | |
3249 | break; | |
ceabb767 | 3250 | |
f513b2bf MD |
3251 | default: |
3252 | return -EINVAL; | |
3253 | } | |
3254 | ret = lttng_metadata_printf(session, | |
3255 | " _%s[ _%s ];\n", | |
3256 | field->name, | |
ceabb767 | 3257 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3258 | return ret; |
3259 | } | |
3260 | ||
141ddf28 MD |
3261 | /* |
3262 | * Must be called with sessions_mutex held. | |
3263 | */ | |
3264 | static | |
ceabb767 MD |
3265 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3266 | const struct lttng_type *type, | |
141ddf28 MD |
3267 | size_t nesting) |
3268 | { | |
3269 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3270 | const struct lttng_type *container_type; |
141ddf28 MD |
3271 | int ret; |
3272 | unsigned int i, nr_entries; | |
3273 | ||
ceabb767 | 3274 | container_type = type->u.enum_nestable.container_type; |
12bb2edb | 3275 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3276 | ret = -EINVAL; |
3277 | goto end; | |
3278 | } | |
3279 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3280 | nr_entries = enum_desc->nr_entries; |
3281 | ||
3282 | ret = print_tabs(session, nesting); | |
3283 | if (ret) | |
3284 | goto end; | |
ceabb767 MD |
3285 | ret = lttng_metadata_printf(session, "enum : "); |
3286 | if (ret) | |
3287 | goto end; | |
3288 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3289 | if (ret) |
ceabb767 MD |
3290 | goto end; |
3291 | ret = lttng_metadata_printf(session, " {\n"); | |
3292 | if (ret) | |
3293 | goto end; | |
141ddf28 MD |
3294 | /* Dump all entries */ |
3295 | for (i = 0; i < nr_entries; i++) { | |
3296 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3297 | int j, len; | |
3298 | ||
3299 | ret = print_tabs(session, nesting + 1); | |
3300 | if (ret) | |
3301 | goto end; | |
3302 | ret = lttng_metadata_printf(session, | |
3303 | "\""); | |
3304 | if (ret) | |
3305 | goto end; | |
3306 | len = strlen(entry->string); | |
3307 | /* Escape the character '"' */ | |
3308 | for (j = 0; j < len; j++) { | |
3309 | char c = entry->string[j]; | |
3310 | ||
3311 | switch (c) { | |
3312 | case '"': | |
3313 | ret = lttng_metadata_printf(session, | |
3314 | "\\\""); | |
3315 | break; | |
3316 | case '\\': | |
3317 | ret = lttng_metadata_printf(session, | |
3318 | "\\\\"); | |
3319 | break; | |
3320 | default: | |
3321 | ret = lttng_metadata_printf(session, | |
3322 | "%c", c); | |
3323 | break; | |
3324 | } | |
3325 | if (ret) | |
3326 | goto end; | |
3327 | } | |
08ad1061 PP |
3328 | ret = lttng_metadata_printf(session, "\""); |
3329 | if (ret) | |
3330 | goto end; | |
3331 | ||
3332 | if (entry->options.is_auto) { | |
3333 | ret = lttng_metadata_printf(session, ",\n"); | |
3334 | if (ret) | |
3335 | goto end; | |
141ddf28 | 3336 | } else { |
7c559490 MD |
3337 | ret = lttng_metadata_printf(session, |
3338 | " = "); | |
3339 | if (ret) | |
3340 | goto end; | |
3341 | if (entry->start.signedness) | |
141ddf28 | 3342 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3343 | "%lld", (long long) entry->start.value); |
3344 | else | |
3345 | ret = lttng_metadata_printf(session, | |
3346 | "%llu", entry->start.value); | |
3347 | if (ret) | |
3348 | goto end; | |
3349 | if (entry->start.signedness == entry->end.signedness && | |
3350 | entry->start.value | |
3351 | == entry->end.value) { | |
141ddf28 | 3352 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3353 | ",\n"); |
3354 | } else { | |
3355 | if (entry->end.signedness) { | |
3356 | ret = lttng_metadata_printf(session, | |
3357 | " ... %lld,\n", | |
3358 | (long long) entry->end.value); | |
3359 | } else { | |
3360 | ret = lttng_metadata_printf(session, | |
3361 | " ... %llu,\n", | |
3362 | entry->end.value); | |
3363 | } | |
141ddf28 | 3364 | } |
7c559490 MD |
3365 | if (ret) |
3366 | goto end; | |
141ddf28 | 3367 | } |
141ddf28 MD |
3368 | } |
3369 | ret = print_tabs(session, nesting); | |
3370 | if (ret) | |
3371 | goto end; | |
ceabb767 | 3372 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3373 | end: |
3374 | return ret; | |
3375 | } | |
3376 | ||
d83004aa JD |
3377 | /* |
3378 | * Must be called with sessions_mutex held. | |
3379 | */ | |
c099397a | 3380 | static |
ceabb767 MD |
3381 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3382 | const struct lttng_event_field *field, | |
3383 | size_t nesting) | |
3384 | { | |
3385 | int ret; | |
3386 | ||
3387 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3388 | if (ret) | |
3389 | return ret; | |
3390 | return lttng_field_name_statedump(session, field, nesting); | |
3391 | } | |
3392 | ||
3393 | static | |
3394 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3395 | const struct lttng_event_field *field, | |
3396 | size_t nesting) | |
3397 | { | |
3398 | int ret; | |
3399 | ||
3400 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3401 | if (ret) | |
3402 | return ret; | |
3403 | return lttng_field_name_statedump(session, field, nesting); | |
3404 | } | |
3405 | ||
3406 | static | |
3407 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3408 | const struct lttng_type *type, | |
3409 | size_t nesting) | |
3410 | { | |
3411 | int ret; | |
3412 | ||
12bb2edb | 3413 | WARN_ON_ONCE(type->type != lttng_kernel_type_string); |
ceabb767 MD |
3414 | /* Default encoding is UTF8 */ |
3415 | ret = print_tabs(session, nesting); | |
3416 | if (ret) | |
3417 | return ret; | |
3418 | ret = lttng_metadata_printf(session, | |
3419 | "string%s", | |
3420 | type->u.string.encoding == lttng_encode_ASCII ? | |
3421 | " { encoding = ASCII; }" : ""); | |
3422 | return ret; | |
3423 | } | |
3424 | ||
3425 | static | |
3426 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3427 | const struct lttng_event_field *field, |
3428 | size_t nesting) | |
ceabb767 MD |
3429 | { |
3430 | int ret; | |
3431 | ||
12bb2edb | 3432 | WARN_ON_ONCE(field->type.type != lttng_kernel_type_string); |
ceabb767 MD |
3433 | ret = _lttng_string_type_statedump(session, &field->type, nesting); |
3434 | if (ret) | |
3435 | return ret; | |
3436 | return lttng_field_name_statedump(session, field, nesting); | |
3437 | } | |
3438 | ||
3439 | /* | |
3440 | * Must be called with sessions_mutex held. | |
3441 | */ | |
3442 | static | |
3443 | int _lttng_type_statedump(struct lttng_session *session, | |
3444 | const struct lttng_type *type, | |
3445 | size_t nesting) | |
c099397a | 3446 | { |
c099397a | 3447 | int ret = 0; |
c099397a | 3448 | |
12bb2edb MD |
3449 | switch (type->type) { |
3450 | case lttng_kernel_type_integer: | |
ceabb767 | 3451 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3452 | break; |
12bb2edb | 3453 | case lttng_kernel_type_enum_nestable: |
ceabb767 | 3454 | ret = _lttng_enum_type_statedump(session, type, nesting); |
8070f5c0 | 3455 | break; |
12bb2edb | 3456 | case lttng_kernel_type_string: |
ceabb767 MD |
3457 | ret = _lttng_string_type_statedump(session, type, nesting); |
3458 | break; | |
12bb2edb | 3459 | case lttng_kernel_type_struct_nestable: |
ceabb767 | 3460 | ret = _lttng_struct_type_statedump(session, type, nesting); |
8070f5c0 | 3461 | break; |
12bb2edb | 3462 | case lttng_kernel_type_variant_nestable: |
ceabb767 MD |
3463 | ret = _lttng_variant_type_statedump(session, type, nesting); |
3464 | break; | |
3465 | ||
3466 | /* Nested arrays and sequences are not supported yet. */ | |
12bb2edb MD |
3467 | case lttng_kernel_type_array_nestable: |
3468 | case lttng_kernel_type_sequence_nestable: | |
ceabb767 MD |
3469 | default: |
3470 | WARN_ON_ONCE(1); | |
3471 | return -EINVAL; | |
8070f5c0 | 3472 | } |
ceabb767 MD |
3473 | return ret; |
3474 | } | |
8070f5c0 | 3475 | |
ceabb767 MD |
3476 | /* |
3477 | * Must be called with sessions_mutex held. | |
3478 | */ | |
3479 | static | |
3480 | int _lttng_field_statedump(struct lttng_session *session, | |
3481 | const struct lttng_event_field *field, | |
3482 | size_t nesting) | |
3483 | { | |
3484 | int ret = 0; | |
27d2368e | 3485 | |
12bb2edb MD |
3486 | switch (field->type.type) { |
3487 | case lttng_kernel_type_integer: | |
ceabb767 MD |
3488 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3489 | break; | |
12bb2edb | 3490 | case lttng_kernel_type_enum_nestable: |
ceabb767 | 3491 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3492 | break; |
12bb2edb | 3493 | case lttng_kernel_type_string: |
ceabb767 | 3494 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3495 | break; |
12bb2edb | 3496 | case lttng_kernel_type_struct_nestable: |
ceabb767 | 3497 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3498 | break; |
12bb2edb | 3499 | case lttng_kernel_type_array_nestable: |
ceabb767 | 3500 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3501 | break; |
12bb2edb | 3502 | case lttng_kernel_type_sequence_nestable: |
ceabb767 | 3503 | ret = _lttng_sequence_field_statedump(session, field, nesting); |
f513b2bf | 3504 | break; |
12bb2edb | 3505 | case lttng_kernel_type_variant_nestable: |
ceabb767 | 3506 | ret = _lttng_variant_field_statedump(session, field, nesting); |
65c85aa6 | 3507 | break; |
f513b2bf | 3508 | |
8070f5c0 MD |
3509 | default: |
3510 | WARN_ON_ONCE(1); | |
3511 | return -EINVAL; | |
3512 | } | |
3513 | return ret; | |
3514 | } | |
3515 | ||
3516 | static | |
a90917c3 | 3517 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3518 | struct lttng_ctx *ctx) |
3519 | { | |
3520 | int ret = 0; | |
3521 | int i; | |
3522 | ||
3523 | if (!ctx) | |
3524 | return 0; | |
3525 | for (i = 0; i < ctx->nr_fields; i++) { | |
3526 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3527 | ||
f513b2bf | 3528 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3529 | if (ret) |
3530 | return ret; | |
3531 | } | |
3532 | return ret; | |
3533 | } | |
3534 | ||
3535 | static | |
a90917c3 MD |
3536 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3537 | struct lttng_event *event) | |
8070f5c0 MD |
3538 | { |
3539 | const struct lttng_event_desc *desc = event->desc; | |
3540 | int ret = 0; | |
3541 | int i; | |
3542 | ||
3543 | for (i = 0; i < desc->nr_fields; i++) { | |
3544 | const struct lttng_event_field *field = &desc->fields[i]; | |
3545 | ||
f513b2bf | 3546 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3547 | if (ret) |
3548 | return ret; | |
c099397a MD |
3549 | } |
3550 | return ret; | |
3551 | } | |
3552 | ||
d83004aa JD |
3553 | /* |
3554 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3555 | * The entire event metadata is printed as a single atomic metadata |
3556 | * transaction. | |
d83004aa | 3557 | */ |
c099397a | 3558 | static |
a90917c3 MD |
3559 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3560 | struct lttng_channel *chan, | |
3561 | struct lttng_event *event) | |
c099397a MD |
3562 | { |
3563 | int ret = 0; | |
3564 | ||
585e5dcc | 3565 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3566 | return 0; |
d83004aa | 3567 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3568 | return 0; |
3569 | ||
8b97fd42 MD |
3570 | lttng_metadata_begin(session); |
3571 | ||
c099397a MD |
3572 | ret = lttng_metadata_printf(session, |
3573 | "event {\n" | |
ae734547 | 3574 | " name = \"%s\";\n" |
c099397a | 3575 | " id = %u;\n" |
b9074a1b | 3576 | " stream_id = %u;\n", |
c099397a MD |
3577 | event->desc->name, |
3578 | event->id, | |
3579 | event->chan->id); | |
3580 | if (ret) | |
3581 | goto end; | |
3582 | ||
b9074a1b MD |
3583 | if (event->ctx) { |
3584 | ret = lttng_metadata_printf(session, | |
3585 | " context := struct {\n"); | |
3586 | if (ret) | |
3587 | goto end; | |
3588 | } | |
a90917c3 | 3589 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3590 | if (ret) |
3591 | goto end; | |
b9074a1b MD |
3592 | if (event->ctx) { |
3593 | ret = lttng_metadata_printf(session, | |
3594 | " };\n"); | |
3595 | if (ret) | |
3596 | goto end; | |
3597 | } | |
8070f5c0 MD |
3598 | |
3599 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3600 | " fields := struct {\n" |
3601 | ); | |
3602 | if (ret) | |
3603 | goto end; | |
3604 | ||
a90917c3 | 3605 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3606 | if (ret) |
3607 | goto end; | |
3608 | ||
3609 | /* | |
3610 | * LTTng space reservation can only reserve multiples of the | |
3611 | * byte size. | |
3612 | */ | |
3613 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3614 | " };\n" |
3615 | "};\n\n"); | |
c099397a MD |
3616 | if (ret) |
3617 | goto end; | |
3618 | ||
c099397a MD |
3619 | event->metadata_dumped = 1; |
3620 | end: | |
8b97fd42 | 3621 | lttng_metadata_end(session); |
c099397a MD |
3622 | return ret; |
3623 | ||
3624 | } | |
3625 | ||
d83004aa JD |
3626 | /* |
3627 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3628 | * The entire channel metadata is printed as a single atomic metadata |
3629 | * transaction. | |
d83004aa | 3630 | */ |
c099397a | 3631 | static |
a90917c3 MD |
3632 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3633 | struct lttng_channel *chan) | |
c099397a MD |
3634 | { |
3635 | int ret = 0; | |
3636 | ||
585e5dcc | 3637 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3638 | return 0; |
d83004aa JD |
3639 | |
3640 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3641 | return 0; |
3642 | ||
8b97fd42 MD |
3643 | lttng_metadata_begin(session); |
3644 | ||
c099397a MD |
3645 | WARN_ON_ONCE(!chan->header_type); |
3646 | ret = lttng_metadata_printf(session, | |
3647 | "stream {\n" | |
3648 | " id = %u;\n" | |
9115fbdc | 3649 | " event.header := %s;\n" |
b9074a1b | 3650 | " packet.context := struct packet_context;\n", |
c099397a MD |
3651 | chan->id, |
3652 | chan->header_type == 1 ? "struct event_header_compact" : | |
3653 | "struct event_header_large"); | |
3654 | if (ret) | |
3655 | goto end; | |
3656 | ||
b9074a1b MD |
3657 | if (chan->ctx) { |
3658 | ret = lttng_metadata_printf(session, | |
3659 | " event.context := struct {\n"); | |
3660 | if (ret) | |
3661 | goto end; | |
3662 | } | |
a90917c3 | 3663 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3664 | if (ret) |
3665 | goto end; | |
b9074a1b MD |
3666 | if (chan->ctx) { |
3667 | ret = lttng_metadata_printf(session, | |
3668 | " };\n"); | |
3669 | if (ret) | |
3670 | goto end; | |
3671 | } | |
8070f5c0 MD |
3672 | |
3673 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3674 | "};\n\n"); |
8070f5c0 | 3675 | |
c099397a MD |
3676 | chan->metadata_dumped = 1; |
3677 | end: | |
8b97fd42 | 3678 | lttng_metadata_end(session); |
c099397a MD |
3679 | return ret; |
3680 | } | |
3681 | ||
d83004aa JD |
3682 | /* |
3683 | * Must be called with sessions_mutex held. | |
3684 | */ | |
9115fbdc | 3685 | static |
a90917c3 | 3686 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3687 | { |
3688 | return lttng_metadata_printf(session, | |
3689 | "struct packet_context {\n" | |
a3ccff4f MD |
3690 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3691 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3692 | " uint64_t content_size;\n" |
3693 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3694 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3695 | " unsigned long events_discarded;\n" |
9115fbdc | 3696 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3697 | "};\n\n" |
9115fbdc MD |
3698 | ); |
3699 | } | |
3700 | ||
3701 | /* | |
3702 | * Compact header: | |
3703 | * id: range: 0 - 30. | |
3704 | * id 31 is reserved to indicate an extended header. | |
3705 | * | |
3706 | * Large header: | |
3707 | * id: range: 0 - 65534. | |
3708 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3709 | * |
3710 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3711 | */ |
3712 | static | |
a90917c3 | 3713 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3714 | { |
3715 | return lttng_metadata_printf(session, | |
3716 | "struct event_header_compact {\n" | |
3717 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3718 | " variant <id> {\n" | |
3719 | " struct {\n" | |
a3ccff4f | 3720 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3721 | " } compact;\n" |
3722 | " struct {\n" | |
3723 | " uint32_t id;\n" | |
a3ccff4f | 3724 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3725 | " } extended;\n" |
3726 | " } v;\n" | |
3727 | "} align(%u);\n" | |
3728 | "\n" | |
3729 | "struct event_header_large {\n" | |
3730 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3731 | " variant <id> {\n" | |
3732 | " struct {\n" | |
a3ccff4f | 3733 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3734 | " } compact;\n" |
3735 | " struct {\n" | |
3736 | " uint32_t id;\n" | |
a3ccff4f | 3737 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3738 | " } extended;\n" |
3739 | " } v;\n" | |
3740 | "} align(%u);\n\n", | |
a90917c3 MD |
3741 | lttng_alignof(uint32_t) * CHAR_BIT, |
3742 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3743 | ); |
3744 | } | |
3745 | ||
a3ccff4f MD |
3746 | /* |
3747 | * Approximation of NTP time of day to clock monotonic correlation, | |
3748 | * taken at start of trace. | |
3749 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3750 | * in future versions. | |
5283350b MD |
3751 | * This function may return a negative offset. It may happen if the |
3752 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3753 | * |
3754 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3755 | * y2038 compliant. | |
a3ccff4f MD |
3756 | */ |
3757 | static | |
8967b2a3 | 3758 | int64_t measure_clock_offset(void) |
a3ccff4f | 3759 | { |
dcb93448 | 3760 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3761 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3762 | int64_t offset; |
a3ccff4f | 3763 | unsigned long flags; |
3636085f MJ |
3764 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3765 | struct timespec64 rts = { 0, 0 }; | |
3766 | #else | |
3767 | struct timespec rts = { 0, 0 }; | |
3768 | #endif | |
a3ccff4f MD |
3769 | |
3770 | /* Disable interrupts to increase correlation precision. */ | |
3771 | local_irq_save(flags); | |
3772 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3773 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3774 | ktime_get_real_ts64(&rts); | |
3775 | #else | |
216b6baa | 3776 | getnstimeofday(&rts); |
3636085f | 3777 | #endif |
a3ccff4f MD |
3778 | monotonic[1] = trace_clock_read64(); |
3779 | local_irq_restore(flags); | |
3780 | ||
dcb93448 | 3781 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3782 | realtime = (uint64_t) rts.tv_sec * tcf; |
3783 | if (tcf == NSEC_PER_SEC) { | |
3784 | realtime += rts.tv_nsec; | |
3785 | } else { | |
3786 | uint64_t n = rts.tv_nsec * tcf; | |
3787 | ||
3788 | do_div(n, NSEC_PER_SEC); | |
3789 | realtime += n; | |
3790 | } | |
dcb93448 | 3791 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3792 | return offset; |
3793 | } | |
3794 | ||
3eb95be4 JR |
3795 | static |
3796 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3797 | { | |
0f3eaad4 | 3798 | int ret = 0; |
3eb95be4 JR |
3799 | size_t i; |
3800 | char cur; | |
3801 | ||
3802 | i = 0; | |
3803 | cur = string[i]; | |
3804 | while (cur != '\0') { | |
3805 | switch (cur) { | |
3806 | case '\n': | |
3807 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3808 | break; | |
3809 | case '\\': | |
3810 | case '"': | |
3811 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3812 | if (ret) | |
3813 | goto error; | |
3814 | /* We still print the current char */ | |
3815 | /* Fallthrough */ | |
3816 | default: | |
3817 | ret = lttng_metadata_printf(session, "%c", cur); | |
3818 | break; | |
3819 | } | |
3820 | ||
3821 | if (ret) | |
3822 | goto error; | |
3823 | ||
3824 | cur = string[++i]; | |
3825 | } | |
3826 | error: | |
3827 | return ret; | |
3828 | } | |
3829 | ||
3830 | static | |
1c88f269 JR |
3831 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3832 | const char *field_value) | |
3eb95be4 JR |
3833 | { |
3834 | int ret; | |
3835 | ||
1c88f269 | 3836 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3837 | if (ret) |
3838 | goto error; | |
3839 | ||
1c88f269 | 3840 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3841 | if (ret) |
3842 | goto error; | |
3843 | ||
3844 | ret = lttng_metadata_printf(session, "\";\n"); | |
3845 | ||
3846 | error: | |
3847 | return ret; | |
3848 | } | |
3849 | ||
c099397a MD |
3850 | /* |
3851 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3852 | * Must be called with sessions_mutex held. |
c099397a MD |
3853 | */ |
3854 | static | |
a90917c3 | 3855 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3856 | { |
30bdb6e4 | 3857 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3858 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3859 | const char *product_uuid; |
a90917c3 MD |
3860 | struct lttng_channel *chan; |
3861 | struct lttng_event *event; | |
c099397a MD |
3862 | int ret = 0; |
3863 | ||
585e5dcc | 3864 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3865 | return 0; |
8b97fd42 MD |
3866 | |
3867 | lttng_metadata_begin(session); | |
3868 | ||
c099397a MD |
3869 | if (session->metadata_dumped) |
3870 | goto skip_session; | |
c099397a | 3871 | |
d793d5e1 | 3872 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3873 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3874 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3875 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3876 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3877 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3878 | |
3879 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3880 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3881 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3882 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3883 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3884 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3885 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3886 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3887 | "\n" |
3888 | "trace {\n" | |
3889 | " major = %u;\n" | |
3890 | " minor = %u;\n" | |
30bdb6e4 | 3891 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3892 | " byte_order = %s;\n" |
3893 | " packet.header := struct {\n" | |
3894 | " uint32_t magic;\n" | |
1ec3f75a | 3895 | " uint8_t uuid[16];\n" |
d793d5e1 | 3896 | " uint32_t stream_id;\n" |
5594698f | 3897 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3898 | " };\n" |
d793d5e1 | 3899 | "};\n\n", |
a90917c3 MD |
3900 | lttng_alignof(uint8_t) * CHAR_BIT, |
3901 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3902 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3903 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3904 | sizeof(unsigned long) * CHAR_BIT, |
3905 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3906 | CTF_SPEC_MAJOR, |
3907 | CTF_SPEC_MINOR, | |
d793d5e1 | 3908 | uuid_s, |
5214fa50 | 3909 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3910 | "be" |
3911 | #else | |
3912 | "le" | |
3913 | #endif | |
3914 | ); | |
3915 | if (ret) | |
3916 | goto end; | |
3917 | ||
99dc9597 MD |
3918 | ret = lttng_metadata_printf(session, |
3919 | "env {\n" | |
a6058143 | 3920 | " hostname = \"%s\";\n" |
c6c9e10f | 3921 | " domain = \"kernel\";\n" |
99dc9597 | 3922 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3923 | " kernel_release = \"%s\";\n" |
3924 | " kernel_version = \"%s\";\n" | |
3925 | " tracer_name = \"lttng-modules\";\n" | |
3926 | " tracer_major = %d;\n" | |
3927 | " tracer_minor = %d;\n" | |
3928 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3929 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3930 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3931 | utsname()->sysname, |
3932 | utsname()->release, | |
c6c9e10f MD |
3933 | utsname()->version, |
3934 | LTTNG_MODULES_MAJOR_VERSION, | |
3935 | LTTNG_MODULES_MINOR_VERSION, | |
3936 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3937 | ); |
3938 | if (ret) | |
3939 | goto end; | |
3940 | ||
1c88f269 JR |
3941 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3942 | if (ret) | |
3943 | goto end; | |
3944 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3945 | session->creation_time); | |
3eb95be4 JR |
3946 | if (ret) |
3947 | goto end; | |
3948 | ||
c88f762e GB |
3949 | /* Add the product UUID to the 'env' section */ |
3950 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3951 | if (product_uuid) { | |
3952 | ret = lttng_metadata_printf(session, | |
3953 | " product_uuid = \"%s\";\n", | |
3954 | product_uuid | |
3955 | ); | |
3956 | if (ret) | |
3957 | goto end; | |
3958 | } | |
3959 | ||
3960 | /* Close the 'env' section */ | |
3eb95be4 JR |
3961 | ret = lttng_metadata_printf(session, "};\n\n"); |
3962 | if (ret) | |
3963 | goto end; | |
3964 | ||
a3ccff4f MD |
3965 | ret = lttng_metadata_printf(session, |
3966 | "clock {\n" | |
2754583e MD |
3967 | " name = \"%s\";\n", |
3968 | trace_clock_name() | |
a82c63f1 MD |
3969 | ); |
3970 | if (ret) | |
3971 | goto end; | |
3972 | ||
3973 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3974 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3975 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3976 | clock_uuid_s |
3977 | ); | |
3978 | if (ret) | |
3979 | goto end; | |
3980 | } | |
3981 | ||
3982 | ret = lttng_metadata_printf(session, | |
2754583e | 3983 | " description = \"%s\";\n" |
a3ccff4f MD |
3984 | " freq = %llu; /* Frequency, in Hz */\n" |
3985 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3986 | " offset = %lld;\n" |
a3ccff4f | 3987 | "};\n\n", |
2754583e | 3988 | trace_clock_description(), |
a3ccff4f | 3989 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3990 | (long long) measure_clock_offset() |
a3ccff4f MD |
3991 | ); |
3992 | if (ret) | |
3993 | goto end; | |
3994 | ||
3995 | ret = lttng_metadata_printf(session, | |
3996 | "typealias integer {\n" | |
3997 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3998 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3999 | "} := uint27_clock_monotonic_t;\n" |
4000 | "\n" | |
4001 | "typealias integer {\n" | |
4002 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4003 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4004 | "} := uint32_clock_monotonic_t;\n" |
4005 | "\n" | |
4006 | "typealias integer {\n" | |
4007 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4008 | " map = clock.%s.value;\n" |
a3ccff4f | 4009 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4010 | trace_clock_name(), |
a3ccff4f | 4011 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4012 | trace_clock_name(), |
4013 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4014 | trace_clock_name() | |
a3ccff4f MD |
4015 | ); |
4016 | if (ret) | |
4017 | goto end; | |
4018 | ||
a90917c3 | 4019 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4020 | if (ret) |
4021 | goto end; | |
4022 | ||
a90917c3 | 4023 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4024 | if (ret) |
4025 | goto end; | |
4026 | ||
c099397a MD |
4027 | skip_session: |
4028 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 4029 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
4030 | if (ret) |
4031 | goto end; | |
4032 | } | |
4033 | ||
4034 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 4035 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
4036 | if (ret) |
4037 | goto end; | |
4038 | } | |
4039 | session->metadata_dumped = 1; | |
4040 | end: | |
8b97fd42 | 4041 | lttng_metadata_end(session); |
c099397a MD |
4042 | return ret; |
4043 | } | |
4044 | ||
c0e31d2e | 4045 | /** |
a90917c3 | 4046 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4047 | * @transport: transport structure |
4048 | * | |
4049 | * Registers a transport which can be used as output to extract the data out of | |
4050 | * LTTng. The module calling this registration function must ensure that no | |
4051 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4052 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4053 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4054 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4055 | * after its registration must it synchronize the TLBs. |
4056 | */ | |
a90917c3 | 4057 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4058 | { |
4059 | /* | |
4060 | * Make sure no page fault can be triggered by the module about to be | |
4061 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4062 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4063 | */ |
263b6c88 | 4064 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4065 | |
4066 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4067 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4068 | mutex_unlock(&sessions_mutex); |
4069 | } | |
a90917c3 | 4070 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4071 | |
4072 | /** | |
a90917c3 | 4073 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4074 | * @transport: transport structure |
4075 | */ | |
a90917c3 | 4076 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4077 | { |
4078 | mutex_lock(&sessions_mutex); | |
4079 | list_del(&transport->node); | |
4080 | mutex_unlock(&sessions_mutex); | |
4081 | } | |
a90917c3 | 4082 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4083 | |
a101fa10 MD |
4084 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4085 | { | |
4086 | /* | |
4087 | * Make sure no page fault can be triggered by the module about to be | |
4088 | * registered. We deal with this here so we don't have to call | |
4089 | * vmalloc_sync_mappings() in each module's init. | |
4090 | */ | |
4091 | wrapper_vmalloc_sync_mappings(); | |
4092 | ||
4093 | mutex_lock(&sessions_mutex); | |
4094 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4095 | mutex_unlock(&sessions_mutex); | |
4096 | } | |
4097 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4098 | ||
4099 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4100 | { | |
4101 | mutex_lock(&sessions_mutex); | |
4102 | list_del(&transport->node); | |
4103 | mutex_unlock(&sessions_mutex); | |
4104 | } | |
4105 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4106 | ||
5f4c791e | 4107 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4108 | |
4109 | enum cpuhp_state lttng_hp_prepare; | |
4110 | enum cpuhp_state lttng_hp_online; | |
4111 | ||
4112 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4113 | { | |
4114 | struct lttng_cpuhp_node *lttng_node; | |
4115 | ||
4116 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4117 | switch (lttng_node->component) { | |
4118 | case LTTNG_RING_BUFFER_FRONTEND: | |
4119 | return 0; | |
4120 | case LTTNG_RING_BUFFER_BACKEND: | |
4121 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4122 | case LTTNG_RING_BUFFER_ITER: | |
4123 | return 0; | |
4124 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4125 | return 0; | |
4126 | default: | |
4127 | return -EINVAL; | |
4128 | } | |
4129 | } | |
4130 | ||
4131 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4132 | { | |
4133 | struct lttng_cpuhp_node *lttng_node; | |
4134 | ||
4135 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4136 | switch (lttng_node->component) { | |
4137 | case LTTNG_RING_BUFFER_FRONTEND: | |
4138 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4139 | case LTTNG_RING_BUFFER_BACKEND: | |
4140 | return 0; | |
4141 | case LTTNG_RING_BUFFER_ITER: | |
4142 | return 0; | |
4143 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4144 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4145 | default: | |
4146 | return -EINVAL; | |
4147 | } | |
4148 | } | |
4149 | ||
4150 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4151 | { | |
4152 | struct lttng_cpuhp_node *lttng_node; | |
4153 | ||
4154 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4155 | switch (lttng_node->component) { | |
4156 | case LTTNG_RING_BUFFER_FRONTEND: | |
4157 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4158 | case LTTNG_RING_BUFFER_BACKEND: | |
4159 | return 0; | |
4160 | case LTTNG_RING_BUFFER_ITER: | |
4161 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4162 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4163 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4164 | default: | |
4165 | return -EINVAL; | |
4166 | } | |
4167 | } | |
4168 | ||
4169 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4170 | { | |
4171 | struct lttng_cpuhp_node *lttng_node; | |
4172 | ||
4173 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4174 | switch (lttng_node->component) { | |
4175 | case LTTNG_RING_BUFFER_FRONTEND: | |
4176 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4177 | case LTTNG_RING_BUFFER_BACKEND: | |
4178 | return 0; | |
4179 | case LTTNG_RING_BUFFER_ITER: | |
4180 | return 0; | |
4181 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4182 | return 0; | |
4183 | default: | |
4184 | return -EINVAL; | |
4185 | } | |
4186 | } | |
4187 | ||
4188 | static int __init lttng_init_cpu_hotplug(void) | |
4189 | { | |
4190 | int ret; | |
4191 | ||
4192 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4193 | lttng_hotplug_prepare, | |
4194 | lttng_hotplug_dead); | |
4195 | if (ret < 0) { | |
4196 | return ret; | |
4197 | } | |
4198 | lttng_hp_prepare = ret; | |
4199 | lttng_rb_set_hp_prepare(ret); | |
4200 | ||
4201 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4202 | lttng_hotplug_online, | |
4203 | lttng_hotplug_offline); | |
4204 | if (ret < 0) { | |
4205 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4206 | lttng_hp_prepare = 0; | |
4207 | return ret; | |
4208 | } | |
4209 | lttng_hp_online = ret; | |
4210 | lttng_rb_set_hp_online(ret); | |
4211 | ||
4212 | return 0; | |
4213 | } | |
4214 | ||
4215 | static void __exit lttng_exit_cpu_hotplug(void) | |
4216 | { | |
4217 | lttng_rb_set_hp_online(0); | |
4218 | cpuhp_remove_multi_state(lttng_hp_online); | |
4219 | lttng_rb_set_hp_prepare(0); | |
4220 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4221 | } | |
4222 | ||
5f4c791e | 4223 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4224 | static int lttng_init_cpu_hotplug(void) |
4225 | { | |
4226 | return 0; | |
4227 | } | |
4228 | static void lttng_exit_cpu_hotplug(void) | |
4229 | { | |
4230 | } | |
5f4c791e | 4231 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4232 | |
4233 | ||
a90917c3 | 4234 | static int __init lttng_events_init(void) |
4e3c1b9b | 4235 | { |
1c25284c MD |
4236 | int ret; |
4237 | ||
453b2495 JD |
4238 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4239 | if (ret) | |
4240 | return ret; | |
389d7070 | 4241 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4242 | if (ret) |
4243 | return ret; | |
4244 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4245 | if (ret) |
4246 | return ret; | |
4247 | ret = lttng_probes_init(); | |
389d7070 MD |
4248 | if (ret) |
4249 | return ret; | |
07dfc1d0 | 4250 | ret = lttng_context_init(); |
20591cf7 MD |
4251 | if (ret) |
4252 | return ret; | |
07dfc1d0 MD |
4253 | ret = lttng_tracepoint_init(); |
4254 | if (ret) | |
4255 | goto error_tp; | |
a90917c3 | 4256 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4257 | if (!event_cache) { |
4258 | ret = -ENOMEM; | |
dffef45d FD |
4259 | goto error_kmem_event; |
4260 | } | |
4261 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4262 | if (!event_notifier_cache) { | |
4263 | ret = -ENOMEM; | |
4264 | goto error_kmem_event_notifier; | |
20591cf7 | 4265 | } |
80996790 | 4266 | ret = lttng_abi_init(); |
02119ee5 MD |
4267 | if (ret) |
4268 | goto error_abi; | |
0c956676 MD |
4269 | ret = lttng_logger_init(); |
4270 | if (ret) | |
4271 | goto error_logger; | |
1e367326 MD |
4272 | ret = lttng_init_cpu_hotplug(); |
4273 | if (ret) | |
4274 | goto error_hotplug; | |
101215b7 | 4275 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4276 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4277 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4278 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4279 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4280 | LTTNG_VERSION_NAME, |
4281 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4282 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4283 | #else | |
4284 | "", | |
4285 | #endif | |
4286 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4287 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4288 | #else | |
4289 | ""); | |
4290 | #endif | |
4e3c1b9b | 4291 | return 0; |
0c956676 | 4292 | |
1e367326 MD |
4293 | error_hotplug: |
4294 | lttng_logger_exit(); | |
0c956676 MD |
4295 | error_logger: |
4296 | lttng_abi_exit(); | |
02119ee5 | 4297 | error_abi: |
dffef45d FD |
4298 | kmem_cache_destroy(event_notifier_cache); |
4299 | error_kmem_event_notifier: | |
1c25284c | 4300 | kmem_cache_destroy(event_cache); |
dffef45d | 4301 | error_kmem_event: |
20591cf7 | 4302 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4303 | error_tp: |
4304 | lttng_context_exit(); | |
101215b7 | 4305 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4306 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4307 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4308 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4309 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4310 | LTTNG_VERSION_NAME, |
4311 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4312 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4313 | #else | |
4314 | "", | |
4315 | #endif | |
4316 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4317 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4318 | #else | |
4319 | ""); | |
4320 | #endif | |
1c25284c | 4321 | return ret; |
4e3c1b9b MD |
4322 | } |
4323 | ||
a90917c3 | 4324 | module_init(lttng_events_init); |
11b5a3c2 | 4325 | |
a90917c3 | 4326 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4327 | { |
a90917c3 | 4328 | struct lttng_session *session, *tmpsession; |
92e94819 | 4329 | |
1e367326 | 4330 | lttng_exit_cpu_hotplug(); |
0c956676 | 4331 | lttng_logger_exit(); |
80996790 | 4332 | lttng_abi_exit(); |
92e94819 | 4333 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4334 | lttng_session_destroy(session); |
11b5a3c2 | 4335 | kmem_cache_destroy(event_cache); |
dffef45d | 4336 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4337 | lttng_tracepoint_exit(); |
07dfc1d0 | 4338 | lttng_context_exit(); |
101215b7 | 4339 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4340 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4341 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4342 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4343 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4344 | LTTNG_VERSION_NAME, |
4345 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4346 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4347 | #else | |
4348 | "", | |
4349 | #endif | |
4350 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4351 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4352 | #else | |
4353 | ""); | |
4354 | #endif | |
4e3c1b9b | 4355 | } |
92e94819 | 4356 | |
a90917c3 | 4357 | module_exit(lttng_events_exit); |
11b5a3c2 | 4358 | |
7ca11e77 | 4359 | #include <generated/patches.h> |
101215b7 MJ |
4360 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4361 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4362 | #endif | |
4363 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4364 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4365 | #endif | |
92e94819 MD |
4366 | MODULE_LICENSE("GPL and additional rights"); |
4367 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4368 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4369 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4370 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4371 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4372 | LTTNG_MODULES_EXTRAVERSION); |