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