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 | { |
edeb3137 MD |
1488 | switch (event->instrumentation) { |
1489 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1490 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1491 | break; |
1492 | case LTTNG_KERNEL_KPROBE: | |
1493 | module_put(event->desc->owner); | |
8bf17deb | 1494 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1495 | break; |
7371f44c MD |
1496 | case LTTNG_KERNEL_KRETPROBE: |
1497 | module_put(event->desc->owner); | |
1498 | lttng_kretprobes_destroy_private(event); | |
1499 | break; | |
259b6cb3 | 1500 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1501 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1502 | break; |
149b9a9d YB |
1503 | case LTTNG_KERNEL_UPROBE: |
1504 | module_put(event->desc->owner); | |
83b802dc | 1505 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1506 | break; |
e884017c | 1507 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1508 | default: |
1509 | WARN_ON_ONCE(1); | |
1510 | } | |
dda6a249 | 1511 | list_del(&event->list); |
8070f5c0 | 1512 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1513 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1514 | } |
1515 | ||
dffef45d FD |
1516 | /* |
1517 | * Only used internally at session destruction. | |
1518 | */ | |
1519 | static | |
1520 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1521 | { | |
1522 | switch (event_notifier->instrumentation) { | |
1523 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1524 | lttng_event_desc_put(event_notifier->desc); |
1525 | break; | |
dffef45d | 1526 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1527 | module_put(event_notifier->desc->owner); |
1528 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1529 | break; | |
8a8ac9a8 FD |
1530 | case LTTNG_KERNEL_NOOP: |
1531 | case LTTNG_KERNEL_SYSCALL: | |
1532 | break; | |
9de67196 FD |
1533 | case LTTNG_KERNEL_UPROBE: |
1534 | module_put(event_notifier->desc->owner); | |
1535 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1536 | break; | |
dffef45d FD |
1537 | case LTTNG_KERNEL_KRETPROBE: |
1538 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1539 | default: |
1540 | WARN_ON_ONCE(1); | |
1541 | } | |
1542 | list_del(&event_notifier->list); | |
1543 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1544 | } | |
1545 | ||
d1f652f8 MD |
1546 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1547 | enum tracker_type tracker_type) | |
e0130fab | 1548 | { |
d1f652f8 MD |
1549 | switch (tracker_type) { |
1550 | case TRACKER_PID: | |
1551 | return &session->pid_tracker; | |
1552 | case TRACKER_VPID: | |
1553 | return &session->vpid_tracker; | |
1554 | case TRACKER_UID: | |
1555 | return &session->uid_tracker; | |
1556 | case TRACKER_VUID: | |
1557 | return &session->vuid_tracker; | |
1558 | case TRACKER_GID: | |
1559 | return &session->gid_tracker; | |
1560 | case TRACKER_VGID: | |
1561 | return &session->vgid_tracker; | |
1562 | default: | |
1563 | WARN_ON_ONCE(1); | |
1564 | return NULL; | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | int lttng_session_track_id(struct lttng_session *session, | |
1569 | enum tracker_type tracker_type, int id) | |
1570 | { | |
1571 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1572 | int ret; |
1573 | ||
d1f652f8 MD |
1574 | tracker = get_tracker(session, tracker_type); |
1575 | if (!tracker) | |
1576 | return -EINVAL; | |
1577 | if (id < -1) | |
e0130fab MD |
1578 | return -EINVAL; |
1579 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1580 | if (id == -1) { |
1581 | /* track all ids: destroy tracker. */ | |
1582 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1583 | ret = 0; |
1584 | } else { | |
d1f652f8 | 1585 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1586 | } |
e0130fab MD |
1587 | mutex_unlock(&sessions_mutex); |
1588 | return ret; | |
1589 | } | |
1590 | ||
d1f652f8 MD |
1591 | int lttng_session_untrack_id(struct lttng_session *session, |
1592 | enum tracker_type tracker_type, int id) | |
e0130fab | 1593 | { |
d1f652f8 | 1594 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1595 | int ret; |
1596 | ||
d1f652f8 MD |
1597 | tracker = get_tracker(session, tracker_type); |
1598 | if (!tracker) | |
1599 | return -EINVAL; | |
1600 | if (id < -1) | |
e0130fab MD |
1601 | return -EINVAL; |
1602 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1603 | if (id == -1) { |
1604 | /* untrack all ids: replace by empty tracker. */ | |
1605 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1606 | } else { |
d1f652f8 | 1607 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1608 | } |
e0130fab MD |
1609 | mutex_unlock(&sessions_mutex); |
1610 | return ret; | |
1611 | } | |
1612 | ||
7e6f9ef6 | 1613 | static |
d1f652f8 | 1614 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1615 | { |
d1f652f8 MD |
1616 | struct lttng_id_tracker *id_tracker = m->private; |
1617 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1618 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1619 | int iter = 0, i; |
1620 | ||
1621 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1622 | if (id_tracker_p) { |
1623 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1624 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1625 | |
f934e302 | 1626 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1627 | if (iter++ >= *pos) |
1628 | return e; | |
1629 | } | |
1630 | } | |
1631 | } else { | |
d1f652f8 | 1632 | /* ID tracker disabled. */ |
7e6f9ef6 | 1633 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1634 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1635 | } |
1636 | iter++; | |
1637 | } | |
1638 | /* End of list */ | |
1639 | return NULL; | |
1640 | } | |
1641 | ||
1642 | /* Called with sessions_mutex held. */ | |
1643 | static | |
d1f652f8 | 1644 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1645 | { |
d1f652f8 MD |
1646 | struct lttng_id_tracker *id_tracker = m->private; |
1647 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1648 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1649 | int iter = 0, i; |
1650 | ||
1651 | (*ppos)++; | |
d1f652f8 MD |
1652 | if (id_tracker_p) { |
1653 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1654 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1655 | |
f934e302 | 1656 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1657 | if (iter++ >= *ppos) |
1658 | return e; | |
1659 | } | |
1660 | } | |
1661 | } else { | |
d1f652f8 | 1662 | /* ID tracker disabled. */ |
7e6f9ef6 | 1663 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1664 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1665 | iter++; |
1666 | } | |
1667 | ||
1668 | /* End of list */ | |
1669 | return NULL; | |
1670 | } | |
1671 | ||
1672 | static | |
d1f652f8 | 1673 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1674 | { |
1675 | mutex_unlock(&sessions_mutex); | |
1676 | } | |
1677 | ||
1678 | static | |
d1f652f8 | 1679 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1680 | { |
d1f652f8 MD |
1681 | struct lttng_id_tracker *id_tracker = m->private; |
1682 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1683 | int id; | |
7e6f9ef6 | 1684 | |
d1f652f8 | 1685 | if (p == id_tracker_p) { |
7e6f9ef6 | 1686 | /* Tracker disabled. */ |
d1f652f8 | 1687 | id = -1; |
7e6f9ef6 | 1688 | } else { |
d1f652f8 | 1689 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1690 | |
d1f652f8 MD |
1691 | id = lttng_id_tracker_get_node_id(e); |
1692 | } | |
1693 | switch (id_tracker->tracker_type) { | |
1694 | case TRACKER_PID: | |
1695 | seq_printf(m, "process { pid = %d; };\n", id); | |
1696 | break; | |
1697 | case TRACKER_VPID: | |
1698 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1699 | break; | |
1700 | case TRACKER_UID: | |
1701 | seq_printf(m, "user { uid = %d; };\n", id); | |
1702 | break; | |
1703 | case TRACKER_VUID: | |
1704 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1705 | break; | |
1706 | case TRACKER_GID: | |
1707 | seq_printf(m, "group { gid = %d; };\n", id); | |
1708 | break; | |
1709 | case TRACKER_VGID: | |
1710 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1711 | break; | |
1712 | default: | |
1713 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1714 | } |
7e6f9ef6 MD |
1715 | return 0; |
1716 | } | |
1717 | ||
1718 | static | |
d1f652f8 MD |
1719 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1720 | .start = id_list_start, | |
1721 | .next = id_list_next, | |
1722 | .stop = id_list_stop, | |
1723 | .show = id_list_show, | |
7e6f9ef6 MD |
1724 | }; |
1725 | ||
1726 | static | |
d1f652f8 | 1727 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1728 | { |
d1f652f8 | 1729 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1730 | } |
1731 | ||
1732 | static | |
d1f652f8 | 1733 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1734 | { |
1735 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1736 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1737 | int ret; |
1738 | ||
d1f652f8 | 1739 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1740 | ret = seq_release(inode, file); |
d1f652f8 MD |
1741 | if (!ret) |
1742 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1743 | return ret; |
1744 | } | |
1745 | ||
d1f652f8 | 1746 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1747 | .owner = THIS_MODULE, |
d1f652f8 | 1748 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1749 | .read = seq_read, |
1750 | .llseek = seq_lseek, | |
d1f652f8 | 1751 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1752 | }; |
1753 | ||
d1f652f8 MD |
1754 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1755 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1756 | { |
d1f652f8 | 1757 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1758 | struct seq_file *m; |
1759 | int file_fd, ret; | |
1760 | ||
1761 | file_fd = lttng_get_unused_fd(); | |
1762 | if (file_fd < 0) { | |
1763 | ret = file_fd; | |
1764 | goto fd_error; | |
1765 | } | |
1766 | ||
d1f652f8 MD |
1767 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1768 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1769 | NULL, O_RDWR); |
d1f652f8 MD |
1770 | if (IS_ERR(tracker_ids_list_file)) { |
1771 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1772 | goto file_error; |
1773 | } | |
98d7281c MJ |
1774 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1775 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1776 | goto refcount_error; |
1777 | } | |
d1f652f8 | 1778 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1779 | if (ret < 0) |
1780 | goto open_error; | |
d1f652f8 MD |
1781 | m = tracker_ids_list_file->private_data; |
1782 | ||
1783 | m->private = get_tracker(session, tracker_type); | |
1784 | BUG_ON(!m->private); | |
1785 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1786 | |
1787 | return file_fd; | |
1788 | ||
1789 | open_error: | |
9c1f4643 MD |
1790 | atomic_long_dec(&session->file->f_count); |
1791 | refcount_error: | |
d1f652f8 | 1792 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1793 | file_error: |
1794 | put_unused_fd(file_fd); | |
1795 | fd_error: | |
1796 | return ret; | |
1797 | } | |
1798 | ||
3c997079 MD |
1799 | /* |
1800 | * Enabler management. | |
1801 | */ | |
1802 | static | |
4993071a PP |
1803 | int lttng_match_enabler_star_glob(const char *desc_name, |
1804 | const char *pattern) | |
3c997079 | 1805 | { |
cbc19040 MD |
1806 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1807 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1808 | return 0; |
1809 | return 1; | |
1810 | } | |
1811 | ||
1812 | static | |
4ecb5ad5 MD |
1813 | int lttng_match_enabler_name(const char *desc_name, |
1814 | const char *name) | |
3c997079 | 1815 | { |
4ecb5ad5 | 1816 | if (strcmp(desc_name, name)) |
3c997079 MD |
1817 | return 0; |
1818 | return 1; | |
1819 | } | |
1820 | ||
3c997079 MD |
1821 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1822 | struct lttng_enabler *enabler) | |
1823 | { | |
4ecb5ad5 | 1824 | const char *desc_name, *enabler_name; |
badfe9f5 | 1825 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1826 | |
1827 | enabler_name = enabler->event_param.name; | |
1828 | switch (enabler->event_param.instrumentation) { | |
1829 | case LTTNG_KERNEL_TRACEPOINT: | |
1830 | desc_name = desc->name; | |
3b861b22 FD |
1831 | switch (enabler->format_type) { |
1832 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1833 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1834 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1835 | return lttng_match_enabler_name(desc_name, enabler_name); |
1836 | default: | |
1837 | return -EINVAL; | |
1838 | } | |
4ecb5ad5 MD |
1839 | break; |
1840 | case LTTNG_KERNEL_SYSCALL: | |
1841 | desc_name = desc->name; | |
badfe9f5 | 1842 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1843 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1844 | compat = true; |
1845 | } | |
4ecb5ad5 MD |
1846 | if (!strncmp(desc_name, "syscall_exit_", |
1847 | strlen("syscall_exit_"))) { | |
1848 | desc_name += strlen("syscall_exit_"); | |
1849 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1850 | strlen("syscall_entry_"))) { | |
1851 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1852 | entry = true; |
4ecb5ad5 MD |
1853 | } else { |
1854 | WARN_ON_ONCE(1); | |
1855 | return -EINVAL; | |
1856 | } | |
badfe9f5 MD |
1857 | switch (enabler->event_param.u.syscall.entryexit) { |
1858 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1859 | break; | |
1860 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1861 | if (!entry) | |
1862 | return 0; | |
1863 | break; | |
1864 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1865 | if (entry) | |
1866 | return 0; | |
1867 | break; | |
1868 | default: | |
1869 | return -EINVAL; | |
1870 | } | |
1871 | switch (enabler->event_param.u.syscall.abi) { | |
1872 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1873 | break; | |
1874 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1875 | if (compat) | |
1876 | return 0; | |
1877 | break; | |
1878 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1879 | if (!compat) | |
1880 | return 0; | |
1881 | break; | |
1882 | default: | |
1883 | return -EINVAL; | |
1884 | } | |
1885 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1886 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1887 | switch (enabler->format_type) { |
1888 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1889 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1890 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1891 | return lttng_match_enabler_name(desc_name, enabler_name); |
1892 | default: | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | break; | |
cff6938b | 1896 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1897 | return -EINVAL; /* Not implemented. */ |
1898 | default: | |
1899 | return -EINVAL; | |
1900 | } | |
4ecb5ad5 MD |
1901 | break; |
1902 | default: | |
1903 | WARN_ON_ONCE(1); | |
1904 | return -EINVAL; | |
1905 | } | |
3c997079 MD |
1906 | } |
1907 | ||
1908 | static | |
b2bc0bc8 FD |
1909 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1910 | struct lttng_event *event) | |
3c997079 | 1911 | { |
b2bc0bc8 FD |
1912 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1913 | event_enabler); | |
1914 | ||
1915 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1916 | return 0; |
b2bc0bc8 FD |
1917 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1918 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1919 | return 1; |
1920 | else | |
1921 | return 0; | |
1922 | } | |
1923 | ||
b01155ba FD |
1924 | static |
1925 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1926 | struct lttng_event_notifier *event_notifier) | |
1927 | { | |
1928 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1929 | event_notifier_enabler); | |
1930 | ||
1931 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1932 | return 0; | |
1933 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1934 | && event_notifier->group == event_notifier_enabler->group | |
1935 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1936 | return 1; | |
1937 | else | |
1938 | return 0; | |
1939 | } | |
1940 | ||
3c997079 | 1941 | static |
b2bc0bc8 FD |
1942 | struct lttng_enabler_ref *lttng_enabler_ref( |
1943 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1944 | struct lttng_enabler *enabler) |
1945 | { | |
1946 | struct lttng_enabler_ref *enabler_ref; | |
1947 | ||
b2bc0bc8 | 1948 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1949 | if (enabler_ref->ref == enabler) |
1950 | return enabler_ref; | |
1951 | } | |
1952 | return NULL; | |
1953 | } | |
1954 | ||
3c997079 | 1955 | static |
1b917d6b | 1956 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1957 | { |
b2bc0bc8 | 1958 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1959 | struct lttng_probe_desc *probe_desc; |
1960 | const struct lttng_event_desc *desc; | |
1961 | int i; | |
1962 | struct list_head *probe_list; | |
1963 | ||
1964 | probe_list = lttng_get_probe_list_head(); | |
1965 | /* | |
1966 | * For each probe event, if we find that a probe event matches | |
1967 | * our enabler, create an associated lttng_event if not | |
1968 | * already present. | |
1969 | */ | |
1970 | list_for_each_entry(probe_desc, probe_list, head) { | |
1971 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1972 | int found = 0; | |
1973 | struct hlist_head *head; | |
3c997079 MD |
1974 | struct lttng_event *event; |
1975 | ||
1976 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1977 | if (!lttng_desc_match_enabler(desc, |
1978 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1979 | continue; |
3c997079 MD |
1980 | |
1981 | /* | |
1982 | * Check if already created. | |
1983 | */ | |
4a11ef1c FD |
1984 | head = utils_borrow_hash_table_bucket( |
1985 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1986 | desc->name); | |
d216ecae | 1987 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1988 | if (event->desc == desc |
b2bc0bc8 | 1989 | && event->chan == event_enabler->chan) |
3c997079 MD |
1990 | found = 1; |
1991 | } | |
1992 | if (found) | |
1993 | continue; | |
1994 | ||
1995 | /* | |
1996 | * We need to create an event for this | |
1997 | * event probe. | |
1998 | */ | |
b2bc0bc8 | 1999 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
2000 | NULL, NULL, desc, |
2001 | LTTNG_KERNEL_TRACEPOINT); | |
2002 | if (!event) { | |
5a15f70c | 2003 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
2004 | probe_desc->event_desc[i]->name); |
2005 | } | |
2006 | } | |
2007 | } | |
2008 | } | |
2009 | ||
b01155ba FD |
2010 | static |
2011 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2012 | { | |
2013 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2014 | struct lttng_probe_desc *probe_desc; | |
2015 | const struct lttng_event_desc *desc; | |
2016 | int i; | |
2017 | struct list_head *probe_list; | |
2018 | ||
2019 | probe_list = lttng_get_probe_list_head(); | |
2020 | /* | |
2021 | * For each probe event, if we find that a probe event matches | |
2022 | * our enabler, create an associated lttng_event_notifier if not | |
2023 | * already present. | |
2024 | */ | |
2025 | list_for_each_entry(probe_desc, probe_list, head) { | |
2026 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2027 | int found = 0; | |
2028 | struct hlist_head *head; | |
2029 | struct lttng_event_notifier *event_notifier; | |
2030 | ||
2031 | desc = probe_desc->event_desc[i]; | |
2032 | if (!lttng_desc_match_enabler(desc, | |
2033 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2034 | continue; | |
2035 | ||
2036 | /* | |
2037 | * Check if already created. | |
2038 | */ | |
2039 | head = utils_borrow_hash_table_bucket( | |
2040 | event_notifier_group->event_notifiers_ht.table, | |
2041 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
2042 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
2043 | if (event_notifier->desc == desc | |
2044 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
2045 | found = 1; | |
2046 | } | |
2047 | if (found) | |
2048 | continue; | |
2049 | ||
2050 | /* | |
2051 | * We need to create a event_notifier for this event probe. | |
2052 | */ | |
2053 | event_notifier = _lttng_event_notifier_create(desc, | |
2054 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2055 | event_notifier_enabler->error_counter_index, |
b01155ba FD |
2056 | event_notifier_group, NULL, NULL, |
2057 | LTTNG_KERNEL_TRACEPOINT); | |
2058 | if (IS_ERR(event_notifier)) { | |
2059 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
2060 | probe_desc->event_desc[i]->name); | |
2061 | } | |
2062 | } | |
2063 | } | |
2064 | } | |
2065 | ||
33a39a3c | 2066 | static |
1b917d6b | 2067 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2068 | { |
2069 | int ret; | |
2070 | ||
3b82c4e1 | 2071 | ret = lttng_syscalls_register_event(event_enabler, NULL); |
33a39a3c MD |
2072 | WARN_ON_ONCE(ret); |
2073 | } | |
2074 | ||
8a8ac9a8 FD |
2075 | static |
2076 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2077 | { | |
2078 | int ret; | |
2079 | ||
2080 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
2081 | WARN_ON_ONCE(ret); | |
2082 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
2083 | WARN_ON_ONCE(ret); | |
2084 | } | |
2085 | ||
33a39a3c MD |
2086 | /* |
2087 | * Create struct lttng_event if it is missing and present in the list of | |
2088 | * tracepoint probes. | |
2089 | * Should be called with sessions mutex held. | |
2090 | */ | |
2091 | static | |
b2bc0bc8 | 2092 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2093 | { |
b2bc0bc8 | 2094 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 2095 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 2096 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
2097 | break; |
2098 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 2099 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
2100 | break; |
2101 | default: | |
2102 | WARN_ON_ONCE(1); | |
2103 | break; | |
2104 | } | |
2105 | } | |
2106 | ||
3c997079 | 2107 | /* |
b2bc0bc8 | 2108 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2109 | * and add backward reference from the event to the enabler. |
2110 | * Should be called with sessions mutex held. | |
2111 | */ | |
2112 | static | |
b2bc0bc8 | 2113 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2114 | { |
b2bc0bc8 FD |
2115 | struct lttng_channel *chan = event_enabler->chan; |
2116 | struct lttng_session *session = event_enabler->chan->session; | |
2117 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2118 | struct lttng_event *event; |
2119 | ||
b2bc0bc8 | 2120 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
b2bc0bc8 | 2121 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && |
cff6938b | 2122 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 | 2123 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 MD |
2124 | int enabled = base_enabler->enabled; |
2125 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2126 | ||
2127 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2128 | WRITE_ONCE(chan->syscall_all_entry, enabled); | |
2129 | ||
2130 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2131 | WRITE_ONCE(chan->syscall_all_exit, enabled); | |
badfe9f5 MD |
2132 | } |
2133 | ||
3c997079 | 2134 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2135 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2136 | |
b2bc0bc8 | 2137 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2138 | list_for_each_entry(event, &session->events, list) { |
2139 | struct lttng_enabler_ref *enabler_ref; | |
2140 | ||
b2bc0bc8 | 2141 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2142 | continue; |
b2bc0bc8 FD |
2143 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2144 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2145 | if (!enabler_ref) { |
2146 | /* | |
2147 | * If no backward ref, create it. | |
b2bc0bc8 | 2148 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2149 | */ |
2150 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2151 | if (!enabler_ref) | |
2152 | return -ENOMEM; | |
b2bc0bc8 | 2153 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2154 | list_add(&enabler_ref->node, |
2155 | &event->enablers_ref_head); | |
2156 | } | |
2157 | ||
f127e61e MD |
2158 | /* |
2159 | * Link filter bytecodes if not linked yet. | |
2160 | */ | |
2dfda770 FD |
2161 | lttng_enabler_link_bytecode(event->desc, |
2162 | lttng_static_ctx, | |
183e8b3a | 2163 | &event->filter_bytecode_runtime_head, |
60206944 | 2164 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2165 | |
3c997079 MD |
2166 | /* TODO: merge event context. */ |
2167 | } | |
2168 | return 0; | |
2169 | } | |
2170 | ||
b01155ba FD |
2171 | /* |
2172 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2173 | * tracepoint probes. | |
2174 | * Should be called with sessions mutex held. | |
2175 | */ | |
2176 | static | |
2177 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2178 | { | |
2179 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2180 | case LTTNG_KERNEL_TRACEPOINT: | |
2181 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2182 | break; | |
8a8ac9a8 FD |
2183 | case LTTNG_KERNEL_SYSCALL: |
2184 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2185 | break; | |
b01155ba FD |
2186 | default: |
2187 | WARN_ON_ONCE(1); | |
2188 | break; | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2194 | */ | |
2195 | static | |
8a8ac9a8 FD |
2196 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2197 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2198 | { |
2199 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2200 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2201 | struct lttng_event_notifier *event_notifier; |
2202 | ||
8a8ac9a8 FD |
2203 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2204 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2205 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2206 | !strcmp(base_enabler->event_param.name, "*")) { | |
2207 | ||
2208 | int enabled = base_enabler->enabled; | |
2209 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2210 | ||
2211 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2212 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2213 | ||
2214 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2215 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2216 | ||
2217 | } | |
2218 | ||
b01155ba FD |
2219 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2220 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2221 | ||
2222 | /* Link the created event_notifier with its associated enabler. */ | |
2223 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2224 | struct lttng_enabler_ref *enabler_ref; | |
2225 | ||
2226 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2227 | continue; | |
2228 | ||
2229 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2230 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2231 | if (!enabler_ref) { | |
2232 | /* | |
2233 | * If no backward ref, create it. | |
2234 | * Add backward ref from event_notifier to enabler. | |
2235 | */ | |
2236 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2237 | if (!enabler_ref) | |
2238 | return -ENOMEM; | |
2239 | ||
2240 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2241 | event_notifier_enabler); | |
2242 | list_add(&enabler_ref->node, | |
2243 | &event_notifier->enablers_ref_head); | |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * Link filter bytecodes if not linked yet. | |
2248 | */ | |
2249 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2250 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2251 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2252 | |
2253 | /* Link capture bytecodes if not linked yet. */ | |
2254 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2255 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2256 | &event_notifier_enabler->capture_bytecode_head); | |
2257 | ||
2258 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2259 | } |
2260 | return 0; | |
2261 | } | |
2262 | ||
3c997079 MD |
2263 | /* |
2264 | * Called at module load: connect the probe on all enablers matching | |
2265 | * this event. | |
2266 | * Called with sessions lock held. | |
2267 | */ | |
2268 | int lttng_fix_pending_events(void) | |
2269 | { | |
2270 | struct lttng_session *session; | |
2271 | ||
2272 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2273 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2274 | return 0; |
2275 | } | |
2276 | ||
b01155ba FD |
2277 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2278 | struct lttng_event_notifier_group *event_notifier_group) | |
2279 | { | |
2280 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2281 | ||
2282 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2283 | node) { | |
2284 | if (event_notifier_enabler->base.enabled) | |
2285 | return true; | |
2286 | } | |
2287 | return false; | |
2288 | } | |
2289 | ||
2290 | bool lttng_event_notifier_active(void) | |
2291 | { | |
2292 | struct lttng_event_notifier_group *event_notifier_group; | |
2293 | ||
2294 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2295 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2296 | return true; | |
2297 | } | |
2298 | return false; | |
2299 | } | |
2300 | ||
2301 | int lttng_fix_pending_event_notifiers(void) | |
2302 | { | |
2303 | struct lttng_event_notifier_group *event_notifier_group; | |
2304 | ||
2305 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2306 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2307 | return 0; | |
2308 | } | |
2309 | ||
b2bc0bc8 FD |
2310 | struct lttng_event_enabler *lttng_event_enabler_create( |
2311 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2312 | struct lttng_kernel_event *event_param, |
2313 | struct lttng_channel *chan) | |
2314 | { | |
b2bc0bc8 | 2315 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2316 | |
b2bc0bc8 FD |
2317 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2318 | if (!event_enabler) | |
3c997079 | 2319 | return NULL; |
b2bc0bc8 FD |
2320 | event_enabler->base.format_type = format_type; |
2321 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2322 | memcpy(&event_enabler->base.event_param, event_param, | |
2323 | sizeof(event_enabler->base.event_param)); | |
2324 | event_enabler->chan = chan; | |
3c997079 | 2325 | /* ctx left NULL */ |
b2bc0bc8 FD |
2326 | event_enabler->base.enabled = 0; |
2327 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2328 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2329 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2330 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2331 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2332 | return event_enabler; |
3c997079 MD |
2333 | } |
2334 | ||
b2bc0bc8 | 2335 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2336 | { |
2337 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2338 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2339 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2340 | mutex_unlock(&sessions_mutex); |
2341 | return 0; | |
2342 | } | |
2343 | ||
b2bc0bc8 | 2344 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2345 | { |
2346 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2347 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2348 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2349 | mutex_unlock(&sessions_mutex); |
2350 | return 0; | |
2351 | } | |
2352 | ||
b2bc0bc8 | 2353 | static |
183e8b3a | 2354 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2355 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2356 | { | |
89ec2b91 | 2357 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2358 | uint32_t bytecode_len; |
2359 | int ret; | |
2360 | ||
2361 | ret = get_user(bytecode_len, &bytecode->len); | |
2362 | if (ret) | |
2363 | return ret; | |
52cfcdf3 | 2364 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2365 | GFP_KERNEL); |
2366 | if (!bytecode_node) | |
2367 | return -ENOMEM; | |
2368 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2369 | sizeof(*bytecode) + bytecode_len); | |
2370 | if (ret) | |
2371 | goto error_free; | |
b2bc0bc8 | 2372 | |
89ec2b91 | 2373 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2374 | bytecode_node->enabler = enabler; |
2375 | /* Enforce length based on allocated size */ | |
2376 | bytecode_node->bc.len = bytecode_len; | |
2377 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2378 | |
07dfc1d0 MD |
2379 | return 0; |
2380 | ||
2381 | error_free: | |
52cfcdf3 | 2382 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2383 | return ret; |
2384 | } | |
2385 | ||
183e8b3a | 2386 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2387 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2388 | { | |
2389 | int ret; | |
183e8b3a | 2390 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2391 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2392 | if (ret) | |
2393 | goto error; | |
2394 | ||
2395 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2396 | return 0; | |
2397 | ||
2398 | error: | |
2399 | return ret; | |
2400 | } | |
2401 | ||
3aed4dca FD |
2402 | int lttng_event_add_callsite(struct lttng_event *event, |
2403 | struct lttng_kernel_event_callsite __user *callsite) | |
2404 | { | |
2405 | ||
2406 | switch (event->instrumentation) { | |
2407 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2408 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2409 | default: |
2410 | return -EINVAL; | |
2411 | } | |
2412 | } | |
2413 | ||
b2bc0bc8 | 2414 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2415 | struct lttng_kernel_context *context_param) |
2416 | { | |
2417 | return -ENOSYS; | |
2418 | } | |
2419 | ||
2420 | static | |
2421 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2422 | { | |
89ec2b91 | 2423 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2424 | |
2425 | /* Destroy filter bytecode */ | |
2426 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2427 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2428 | lttng_kvfree(filter_node); |
07dfc1d0 | 2429 | } |
b2bc0bc8 FD |
2430 | } |
2431 | ||
2432 | static | |
2433 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2434 | { | |
2435 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2436 | |
3c997079 | 2437 | /* Destroy contexts */ |
b2bc0bc8 | 2438 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2439 | |
b2bc0bc8 FD |
2440 | list_del(&event_enabler->node); |
2441 | kfree(event_enabler); | |
3c997079 MD |
2442 | } |
2443 | ||
dffef45d FD |
2444 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2445 | struct lttng_event_notifier_group *event_notifier_group, | |
2446 | enum lttng_enabler_format_type format_type, | |
2447 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2448 | { | |
2449 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2450 | ||
2451 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2452 | if (!event_notifier_enabler) | |
2453 | return NULL; | |
2454 | ||
2455 | event_notifier_enabler->base.format_type = format_type; | |
2456 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2457 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2458 | ||
99f52fcc | 2459 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2460 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2461 | |
8a8ac9a8 FD |
2462 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2463 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2464 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2465 | ||
2466 | event_notifier_enabler->base.enabled = 0; | |
2467 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2468 | event_notifier_enabler->group = event_notifier_group; | |
2469 | ||
2470 | mutex_lock(&sessions_mutex); | |
2471 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2472 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2473 | |
2474 | mutex_unlock(&sessions_mutex); | |
2475 | ||
2476 | return event_notifier_enabler; | |
2477 | } | |
2478 | ||
2479 | int lttng_event_notifier_enabler_enable( | |
2480 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2481 | { | |
2482 | mutex_lock(&sessions_mutex); | |
2483 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2484 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2485 | mutex_unlock(&sessions_mutex); |
2486 | return 0; | |
2487 | } | |
2488 | ||
2489 | int lttng_event_notifier_enabler_disable( | |
2490 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2491 | { | |
2492 | mutex_lock(&sessions_mutex); | |
2493 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2494 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2495 | mutex_unlock(&sessions_mutex); |
2496 | return 0; | |
2497 | } | |
2498 | ||
183e8b3a | 2499 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2500 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2501 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2502 | { | |
2503 | int ret; | |
2504 | ||
183e8b3a | 2505 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2506 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2507 | bytecode); | |
2508 | if (ret) | |
2509 | goto error; | |
2510 | ||
b01155ba | 2511 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2512 | return 0; |
2513 | ||
2514 | error: | |
2515 | return ret; | |
2516 | } | |
2517 | ||
99d223ad FD |
2518 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2519 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2520 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2521 | { | |
2522 | struct lttng_bytecode_node *bytecode_node; | |
2523 | struct lttng_enabler *enabler = | |
2524 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2525 | uint32_t bytecode_len; | |
2526 | int ret; | |
2527 | ||
2528 | ret = get_user(bytecode_len, &bytecode->len); | |
2529 | if (ret) | |
2530 | return ret; | |
2531 | ||
2532 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2533 | GFP_KERNEL); | |
2534 | if (!bytecode_node) | |
2535 | return -ENOMEM; | |
2536 | ||
2537 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2538 | sizeof(*bytecode) + bytecode_len); | |
2539 | if (ret) | |
2540 | goto error_free; | |
2541 | ||
2542 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2543 | bytecode_node->enabler = enabler; | |
2544 | ||
2545 | /* Enforce length based on allocated size */ | |
2546 | bytecode_node->bc.len = bytecode_len; | |
2547 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2548 | ||
2549 | event_notifier_enabler->num_captures++; | |
2550 | ||
2551 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2552 | goto end; | |
2553 | ||
2554 | error_free: | |
2555 | lttng_kvfree(bytecode_node); | |
2556 | end: | |
2557 | return ret; | |
2558 | } | |
2559 | ||
9de67196 FD |
2560 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2561 | struct lttng_kernel_event_callsite __user *callsite) | |
2562 | { | |
2563 | ||
2564 | switch (event_notifier->instrumentation) { | |
2565 | case LTTNG_KERNEL_UPROBE: | |
2566 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2567 | callsite); | |
2568 | default: | |
2569 | return -EINVAL; | |
2570 | } | |
2571 | } | |
2572 | ||
dffef45d FD |
2573 | int lttng_event_notifier_enabler_attach_context( |
2574 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2575 | struct lttng_kernel_context *context_param) | |
2576 | { | |
2577 | return -ENOSYS; | |
2578 | } | |
2579 | ||
2580 | static | |
2581 | void lttng_event_notifier_enabler_destroy( | |
2582 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2583 | { | |
2584 | if (!event_notifier_enabler) { | |
2585 | return; | |
2586 | } | |
2587 | ||
2588 | list_del(&event_notifier_enabler->node); | |
2589 | ||
2590 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2591 | kfree(event_notifier_enabler); | |
2592 | } | |
2593 | ||
3c997079 | 2594 | /* |
b2bc0bc8 | 2595 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2596 | * session. |
2597 | * Should be called with sessions mutex held. | |
2598 | */ | |
2599 | static | |
b2bc0bc8 | 2600 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2601 | { |
b2bc0bc8 | 2602 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2603 | struct lttng_event *event; |
2604 | ||
b2bc0bc8 FD |
2605 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2606 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2607 | /* |
2608 | * For each event, if at least one of its enablers is enabled, | |
2609 | * and its channel and session transient states are enabled, we | |
2610 | * enable the event, else we disable it. | |
2611 | */ | |
2612 | list_for_each_entry(event, &session->events, list) { | |
2613 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2614 | struct lttng_bytecode_runtime *runtime; |
2615 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2616 | |
4ecb5ad5 MD |
2617 | switch (event->instrumentation) { |
2618 | case LTTNG_KERNEL_TRACEPOINT: | |
2619 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2620 | /* Enable events */ |
2621 | list_for_each_entry(enabler_ref, | |
2622 | &event->enablers_ref_head, node) { | |
2623 | if (enabler_ref->ref->enabled) { | |
2624 | enabled = 1; | |
2625 | break; | |
2626 | } | |
2627 | } | |
4ecb5ad5 MD |
2628 | break; |
2629 | default: | |
3c997079 MD |
2630 | /* Not handled with lazy sync. */ |
2631 | continue; | |
2632 | } | |
2633 | /* | |
2634 | * Enabled state is based on union of enablers, with | |
2635 | * intesection of session and channel transient enable | |
2636 | * states. | |
2637 | */ | |
2638 | enabled = enabled && session->tstate && event->chan->tstate; | |
2639 | ||
a8f2d0c7 | 2640 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2641 | /* |
2642 | * Sync tracepoint registration with event enabled | |
2643 | * state. | |
2644 | */ | |
2645 | if (enabled) { | |
2646 | register_event(event); | |
2647 | } else { | |
2648 | _lttng_event_unregister(event); | |
2649 | } | |
07dfc1d0 MD |
2650 | |
2651 | /* Check if has enablers without bytecode enabled */ | |
2652 | list_for_each_entry(enabler_ref, | |
2653 | &event->enablers_ref_head, node) { | |
2654 | if (enabler_ref->ref->enabled | |
2655 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2656 | has_enablers_without_bytecode = 1; | |
2657 | break; | |
2658 | } | |
2659 | } | |
2660 | event->has_enablers_without_bytecode = | |
2661 | has_enablers_without_bytecode; | |
2662 | ||
2663 | /* Enable filters */ | |
2664 | list_for_each_entry(runtime, | |
183e8b3a | 2665 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2666 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2667 | } |
2668 | } | |
2669 | ||
2670 | /* | |
2671 | * Apply enablers to session events, adding events to session if need | |
2672 | * be. It is required after each modification applied to an active | |
2673 | * session, and right before session "start". | |
2674 | * "lazy" sync means we only sync if required. | |
2675 | * Should be called with sessions mutex held. | |
2676 | */ | |
2677 | static | |
b2bc0bc8 | 2678 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2679 | { |
2680 | /* We can skip if session is not active */ | |
2681 | if (!session->active) | |
2682 | return; | |
b2bc0bc8 | 2683 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2684 | } |
2685 | ||
b01155ba FD |
2686 | static |
2687 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2688 | { | |
2689 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2690 | struct lttng_event_notifier *event_notifier; | |
2691 | ||
2692 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2693 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2694 | ||
2695 | /* | |
2696 | * For each event_notifier, if at least one of its enablers is enabled, | |
2697 | * we enable the event_notifier, else we disable it. | |
2698 | */ | |
2699 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2700 | struct lttng_enabler_ref *enabler_ref; | |
2701 | struct lttng_bytecode_runtime *runtime; | |
2702 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2703 | ||
2704 | switch (event_notifier->instrumentation) { | |
2705 | case LTTNG_KERNEL_TRACEPOINT: | |
2706 | case LTTNG_KERNEL_SYSCALL: | |
2707 | /* Enable event_notifiers */ | |
2708 | list_for_each_entry(enabler_ref, | |
2709 | &event_notifier->enablers_ref_head, node) { | |
2710 | if (enabler_ref->ref->enabled) { | |
2711 | enabled = 1; | |
2712 | break; | |
2713 | } | |
2714 | } | |
2715 | break; | |
2716 | default: | |
2717 | /* Not handled with sync. */ | |
2718 | continue; | |
2719 | } | |
2720 | ||
2721 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2722 | /* | |
2723 | * Sync tracepoint registration with event_notifier enabled | |
2724 | * state. | |
2725 | */ | |
2726 | if (enabled) { | |
2727 | if (!event_notifier->registered) | |
2728 | register_event_notifier(event_notifier); | |
2729 | } else { | |
2730 | if (event_notifier->registered) | |
2731 | _lttng_event_notifier_unregister(event_notifier); | |
2732 | } | |
2733 | ||
2734 | /* Check if has enablers without bytecode enabled */ | |
2735 | list_for_each_entry(enabler_ref, | |
2736 | &event_notifier->enablers_ref_head, node) { | |
2737 | if (enabler_ref->ref->enabled | |
2738 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2739 | has_enablers_without_bytecode = 1; | |
2740 | break; | |
2741 | } | |
2742 | } | |
2743 | event_notifier->has_enablers_without_bytecode = | |
2744 | has_enablers_without_bytecode; | |
2745 | ||
2746 | /* Enable filters */ | |
2747 | list_for_each_entry(runtime, | |
183e8b3a | 2748 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2749 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2750 | |
2751 | /* Enable captures */ | |
2752 | list_for_each_entry(runtime, | |
2753 | &event_notifier->capture_bytecode_runtime_head, node) | |
2754 | lttng_bytecode_capture_sync_state(runtime); | |
b01155ba FD |
2755 | } |
2756 | } | |
2757 | ||
1ec3f75a | 2758 | /* |
d83004aa JD |
2759 | * Serialize at most one packet worth of metadata into a metadata |
2760 | * channel. | |
92d9f5e6 MD |
2761 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2762 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2763 | * allows us to do racy operations such as looking for remaining space left in | |
2764 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2765 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2766 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2767 | * Returns the number of bytes written in the channel, 0 if no data |
2768 | * was written and a negative value on error. | |
1ec3f75a | 2769 | */ |
b3b8072b | 2770 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2771 | struct channel *chan, bool *coherent) |
d83004aa JD |
2772 | { |
2773 | struct lib_ring_buffer_ctx ctx; | |
2774 | int ret = 0; | |
2775 | size_t len, reserve_len; | |
2776 | ||
f613e3e6 | 2777 | /* |
92d9f5e6 MD |
2778 | * Ensure we support mutiple get_next / put sequences followed by |
2779 | * put_next. The metadata cache lock protects reading the metadata | |
2780 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2781 | * "flush" operations on the buffer invoked by different processes. | |
2782 | * Moreover, since the metadata cache memory can be reallocated, we | |
2783 | * need to have exclusive access against updates even though we only | |
2784 | * read it. | |
f613e3e6 | 2785 | */ |
92d9f5e6 | 2786 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2787 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2788 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2789 | goto end; |
f613e3e6 | 2790 | |
9616f0bf JD |
2791 | /* Metadata regenerated, change the version. */ |
2792 | if (stream->metadata_cache->version != stream->version) | |
2793 | stream->version = stream->metadata_cache->version; | |
2794 | ||
d83004aa | 2795 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2796 | stream->metadata_in; |
9de2c215 | 2797 | if (!len) |
de23d59d | 2798 | goto end; |
d83004aa | 2799 | reserve_len = min_t(size_t, |
b3b8072b | 2800 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2801 | len); |
b3b8072b | 2802 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2803 | sizeof(char), -1); |
2804 | /* | |
2805 | * If reservation failed, return an error to the caller. | |
2806 | */ | |
b3b8072b | 2807 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2808 | if (ret != 0) { |
2809 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2810 | stream->coherent = false; |
d83004aa JD |
2811 | goto end; |
2812 | } | |
b3b8072b | 2813 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2814 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2815 | reserve_len); |
b3b8072b | 2816 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2817 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2818 | if (reserve_len < len) |
8b97fd42 MD |
2819 | stream->coherent = false; |
2820 | else | |
2821 | stream->coherent = true; | |
d83004aa JD |
2822 | ret = reserve_len; |
2823 | ||
2824 | end: | |
8b97fd42 MD |
2825 | if (coherent) |
2826 | *coherent = stream->coherent; | |
92d9f5e6 | 2827 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2828 | return ret; |
2829 | } | |
2830 | ||
8b97fd42 MD |
2831 | static |
2832 | void lttng_metadata_begin(struct lttng_session *session) | |
2833 | { | |
3e75e2a7 MD |
2834 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2835 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2836 | } |
2837 | ||
2838 | static | |
2839 | void lttng_metadata_end(struct lttng_session *session) | |
2840 | { | |
3e75e2a7 MD |
2841 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2842 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2843 | struct lttng_metadata_stream *stream; | |
2844 | ||
3e75e2a7 MD |
2845 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2846 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2847 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2848 | } |
8b97fd42 MD |
2849 | } |
2850 | ||
d83004aa JD |
2851 | /* |
2852 | * Write the metadata to the metadata cache. | |
2853 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2854 | * The metadata cache lock protects us from concurrent read access from |
2855 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2856 | * The content of the printf is printed as a single atomic metadata |
2857 | * transaction. | |
d83004aa | 2858 | */ |
a90917c3 | 2859 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2860 | const char *fmt, ...) |
2861 | { | |
c099397a | 2862 | char *str; |
d83004aa | 2863 | size_t len; |
c099397a MD |
2864 | va_list ap; |
2865 | ||
585e5dcc | 2866 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2867 | |
2868 | va_start(ap, fmt); | |
2869 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2870 | va_end(ap); | |
2871 | if (!str) | |
2872 | return -ENOMEM; | |
2873 | ||
1ec3f75a | 2874 | len = strlen(str); |
3e75e2a7 | 2875 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2876 | if (session->metadata_cache->metadata_written + len > |
2877 | session->metadata_cache->cache_alloc) { | |
2878 | char *tmp_cache_realloc; | |
2879 | unsigned int tmp_cache_alloc_size; | |
2880 | ||
2881 | tmp_cache_alloc_size = max_t(unsigned int, | |
2882 | session->metadata_cache->cache_alloc + len, | |
2883 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2884 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2885 | if (!tmp_cache_realloc) |
2886 | goto err; | |
a606b6e8 ML |
2887 | if (session->metadata_cache->data) { |
2888 | memcpy(tmp_cache_realloc, | |
2889 | session->metadata_cache->data, | |
2890 | session->metadata_cache->cache_alloc); | |
2891 | vfree(session->metadata_cache->data); | |
2892 | } | |
2893 | ||
d83004aa JD |
2894 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2895 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2896 | } |
d83004aa JD |
2897 | memcpy(session->metadata_cache->data + |
2898 | session->metadata_cache->metadata_written, | |
2899 | str, len); | |
2900 | session->metadata_cache->metadata_written += len; | |
c099397a | 2901 | kfree(str); |
d83004aa | 2902 | |
d83004aa JD |
2903 | return 0; |
2904 | ||
2905 | err: | |
2906 | kfree(str); | |
2907 | return -ENOMEM; | |
c099397a MD |
2908 | } |
2909 | ||
f513b2bf MD |
2910 | static |
2911 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2912 | { | |
2913 | size_t i; | |
2914 | ||
2915 | for (i = 0; i < nesting; i++) { | |
2916 | int ret; | |
2917 | ||
2918 | ret = lttng_metadata_printf(session, " "); | |
2919 | if (ret) { | |
2920 | return ret; | |
2921 | } | |
2922 | } | |
2923 | return 0; | |
2924 | } | |
2925 | ||
ceabb767 MD |
2926 | static |
2927 | int lttng_field_name_statedump(struct lttng_session *session, | |
2928 | const struct lttng_event_field *field, | |
2929 | size_t nesting) | |
2930 | { | |
2931 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2932 | } | |
2933 | ||
2934 | static | |
2935 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2936 | const struct lttng_type *type, | |
2937 | size_t nesting) | |
2938 | { | |
2939 | int ret; | |
2940 | ||
2941 | WARN_ON_ONCE(type->atype != atype_integer); | |
2942 | ret = print_tabs(session, nesting); | |
2943 | if (ret) | |
2944 | return ret; | |
2945 | ret = lttng_metadata_printf(session, | |
2946 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2947 | type->u.integer.size, | |
2948 | type->u.integer.alignment, | |
2949 | type->u.integer.signedness, | |
2950 | (type->u.integer.encoding == lttng_encode_none) | |
2951 | ? "none" | |
2952 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2953 | ? "UTF8" | |
2954 | : "ASCII", | |
2955 | type->u.integer.base, | |
2956 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2957 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2958 | #else | |
2959 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2960 | #endif | |
2961 | ); | |
2962 | return ret; | |
2963 | } | |
2964 | ||
f513b2bf MD |
2965 | /* |
2966 | * Must be called with sessions_mutex held. | |
2967 | */ | |
2968 | static | |
2969 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2970 | const struct lttng_type *type, | |
2971 | size_t nesting) | |
2972 | { | |
2973 | int ret; | |
2974 | uint32_t i, nr_fields; | |
ceabb767 MD |
2975 | unsigned int alignment; |
2976 | ||
2977 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2978 | |
2979 | ret = print_tabs(session, nesting); | |
2980 | if (ret) | |
2981 | return ret; | |
2982 | ret = lttng_metadata_printf(session, | |
2983 | "struct {\n"); | |
2984 | if (ret) | |
2985 | return ret; | |
ceabb767 | 2986 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2987 | for (i = 0; i < nr_fields; i++) { |
2988 | const struct lttng_event_field *iter_field; | |
2989 | ||
ceabb767 | 2990 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2991 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2992 | if (ret) | |
2993 | return ret; | |
2994 | } | |
2995 | ret = print_tabs(session, nesting); | |
2996 | if (ret) | |
2997 | return ret; | |
ceabb767 MD |
2998 | alignment = type->u.struct_nestable.alignment; |
2999 | if (alignment) { | |
3000 | ret = lttng_metadata_printf(session, | |
3001 | "} align(%u)", | |
3002 | alignment); | |
3003 | } else { | |
3004 | ret = lttng_metadata_printf(session, | |
3005 | "}"); | |
3006 | } | |
f513b2bf MD |
3007 | return ret; |
3008 | } | |
3009 | ||
3010 | /* | |
3011 | * Must be called with sessions_mutex held. | |
3012 | */ | |
3013 | static | |
ceabb767 | 3014 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3015 | const struct lttng_event_field *field, |
3016 | size_t nesting) | |
3017 | { | |
3018 | int ret; | |
3019 | ||
3020 | ret = _lttng_struct_type_statedump(session, | |
3021 | &field->type, nesting); | |
3022 | if (ret) | |
3023 | return ret; | |
ceabb767 | 3024 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3025 | } |
3026 | ||
65c85aa6 MD |
3027 | /* |
3028 | * Must be called with sessions_mutex held. | |
3029 | */ | |
3030 | static | |
3031 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
3032 | const struct lttng_type *type, | |
3033 | size_t nesting) | |
3034 | { | |
3035 | int ret; | |
3036 | uint32_t i, nr_choices; | |
3037 | ||
ceabb767 MD |
3038 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
3039 | /* | |
3040 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3041 | */ | |
3042 | if (type->u.variant_nestable.alignment != 0) | |
3043 | return -EINVAL; | |
65c85aa6 MD |
3044 | ret = print_tabs(session, nesting); |
3045 | if (ret) | |
3046 | return ret; | |
3047 | ret = lttng_metadata_printf(session, | |
3048 | "variant <_%s> {\n", | |
ceabb767 | 3049 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
3050 | if (ret) |
3051 | return ret; | |
ceabb767 | 3052 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
3053 | for (i = 0; i < nr_choices; i++) { |
3054 | const struct lttng_event_field *iter_field; | |
3055 | ||
ceabb767 | 3056 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
3057 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
3058 | if (ret) | |
3059 | return ret; | |
3060 | } | |
3061 | ret = print_tabs(session, nesting); | |
3062 | if (ret) | |
3063 | return ret; | |
3064 | ret = lttng_metadata_printf(session, | |
3065 | "}"); | |
3066 | return ret; | |
3067 | } | |
3068 | ||
3069 | /* | |
3070 | * Must be called with sessions_mutex held. | |
3071 | */ | |
3072 | static | |
ceabb767 | 3073 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
3074 | const struct lttng_event_field *field, |
3075 | size_t nesting) | |
3076 | { | |
3077 | int ret; | |
3078 | ||
3079 | ret = _lttng_variant_type_statedump(session, | |
3080 | &field->type, nesting); | |
3081 | if (ret) | |
3082 | return ret; | |
ceabb767 | 3083 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3084 | } |
3085 | ||
f513b2bf MD |
3086 | /* |
3087 | * Must be called with sessions_mutex held. | |
3088 | */ | |
3089 | static | |
ceabb767 | 3090 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3091 | const struct lttng_event_field *field, |
3092 | size_t nesting) | |
3093 | { | |
3094 | int ret; | |
3095 | const struct lttng_type *elem_type; | |
3096 | ||
ceabb767 MD |
3097 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
3098 | ||
3099 | if (field->type.u.array_nestable.alignment) { | |
3100 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3101 | if (ret) |
3102 | return ret; | |
ceabb767 MD |
3103 | ret = lttng_metadata_printf(session, |
3104 | "struct { } align(%u) _%s_padding;\n", | |
3105 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
3106 | field->name); | |
3107 | if (ret) | |
3108 | return ret; | |
3109 | } | |
3110 | /* | |
3111 | * Nested compound types: Only array of structures and variants are | |
3112 | * currently supported. | |
3113 | */ | |
3114 | elem_type = field->type.u.array_nestable.elem_type; | |
3115 | switch (elem_type->atype) { | |
3116 | case atype_integer: | |
3117 | case atype_struct_nestable: | |
3118 | case atype_variant_nestable: | |
3119 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3120 | if (ret) |
3121 | return ret; | |
3122 | break; | |
ceabb767 | 3123 | |
f513b2bf MD |
3124 | default: |
3125 | return -EINVAL; | |
3126 | } | |
3127 | ret = lttng_metadata_printf(session, | |
3128 | " _%s[%u];\n", | |
3129 | field->name, | |
ceabb767 | 3130 | field->type.u.array_nestable.length); |
f513b2bf MD |
3131 | return ret; |
3132 | } | |
3133 | ||
3134 | /* | |
3135 | * Must be called with sessions_mutex held. | |
3136 | */ | |
3137 | static | |
ceabb767 | 3138 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3139 | const struct lttng_event_field *field, |
3140 | size_t nesting) | |
3141 | { | |
3142 | int ret; | |
3143 | const char *length_name; | |
3144 | const struct lttng_type *elem_type; | |
3145 | ||
ceabb767 | 3146 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3147 | |
ceabb767 MD |
3148 | length_name = field->type.u.sequence_nestable.length_name; |
3149 | ||
3150 | if (field->type.u.sequence_nestable.alignment) { | |
3151 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3152 | if (ret) |
3153 | return ret; | |
ceabb767 MD |
3154 | ret = lttng_metadata_printf(session, |
3155 | "struct { } align(%u) _%s_padding;\n", | |
3156 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3157 | field->name); | |
3158 | if (ret) | |
3159 | return ret; | |
3160 | } | |
3161 | ||
3162 | /* | |
3163 | * Nested compound types: Only array of structures and variants are | |
3164 | * currently supported. | |
3165 | */ | |
3166 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3167 | switch (elem_type->atype) { | |
3168 | case atype_integer: | |
3169 | case atype_struct_nestable: | |
3170 | case atype_variant_nestable: | |
3171 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3172 | if (ret) |
3173 | return ret; | |
3174 | break; | |
ceabb767 | 3175 | |
f513b2bf MD |
3176 | default: |
3177 | return -EINVAL; | |
3178 | } | |
3179 | ret = lttng_metadata_printf(session, | |
3180 | " _%s[ _%s ];\n", | |
3181 | field->name, | |
ceabb767 | 3182 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3183 | return ret; |
3184 | } | |
3185 | ||
141ddf28 MD |
3186 | /* |
3187 | * Must be called with sessions_mutex held. | |
3188 | */ | |
3189 | static | |
ceabb767 MD |
3190 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3191 | const struct lttng_type *type, | |
141ddf28 MD |
3192 | size_t nesting) |
3193 | { | |
3194 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3195 | const struct lttng_type *container_type; |
141ddf28 MD |
3196 | int ret; |
3197 | unsigned int i, nr_entries; | |
3198 | ||
ceabb767 MD |
3199 | container_type = type->u.enum_nestable.container_type; |
3200 | if (container_type->atype != atype_integer) { | |
3201 | ret = -EINVAL; | |
3202 | goto end; | |
3203 | } | |
3204 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3205 | nr_entries = enum_desc->nr_entries; |
3206 | ||
3207 | ret = print_tabs(session, nesting); | |
3208 | if (ret) | |
3209 | goto end; | |
ceabb767 MD |
3210 | ret = lttng_metadata_printf(session, "enum : "); |
3211 | if (ret) | |
3212 | goto end; | |
3213 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3214 | if (ret) |
ceabb767 MD |
3215 | goto end; |
3216 | ret = lttng_metadata_printf(session, " {\n"); | |
3217 | if (ret) | |
3218 | goto end; | |
141ddf28 MD |
3219 | /* Dump all entries */ |
3220 | for (i = 0; i < nr_entries; i++) { | |
3221 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3222 | int j, len; | |
3223 | ||
3224 | ret = print_tabs(session, nesting + 1); | |
3225 | if (ret) | |
3226 | goto end; | |
3227 | ret = lttng_metadata_printf(session, | |
3228 | "\""); | |
3229 | if (ret) | |
3230 | goto end; | |
3231 | len = strlen(entry->string); | |
3232 | /* Escape the character '"' */ | |
3233 | for (j = 0; j < len; j++) { | |
3234 | char c = entry->string[j]; | |
3235 | ||
3236 | switch (c) { | |
3237 | case '"': | |
3238 | ret = lttng_metadata_printf(session, | |
3239 | "\\\""); | |
3240 | break; | |
3241 | case '\\': | |
3242 | ret = lttng_metadata_printf(session, | |
3243 | "\\\\"); | |
3244 | break; | |
3245 | default: | |
3246 | ret = lttng_metadata_printf(session, | |
3247 | "%c", c); | |
3248 | break; | |
3249 | } | |
3250 | if (ret) | |
3251 | goto end; | |
3252 | } | |
08ad1061 PP |
3253 | ret = lttng_metadata_printf(session, "\""); |
3254 | if (ret) | |
3255 | goto end; | |
3256 | ||
3257 | if (entry->options.is_auto) { | |
3258 | ret = lttng_metadata_printf(session, ",\n"); | |
3259 | if (ret) | |
3260 | goto end; | |
141ddf28 | 3261 | } else { |
7c559490 MD |
3262 | ret = lttng_metadata_printf(session, |
3263 | " = "); | |
3264 | if (ret) | |
3265 | goto end; | |
3266 | if (entry->start.signedness) | |
141ddf28 | 3267 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3268 | "%lld", (long long) entry->start.value); |
3269 | else | |
3270 | ret = lttng_metadata_printf(session, | |
3271 | "%llu", entry->start.value); | |
3272 | if (ret) | |
3273 | goto end; | |
3274 | if (entry->start.signedness == entry->end.signedness && | |
3275 | entry->start.value | |
3276 | == entry->end.value) { | |
141ddf28 | 3277 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3278 | ",\n"); |
3279 | } else { | |
3280 | if (entry->end.signedness) { | |
3281 | ret = lttng_metadata_printf(session, | |
3282 | " ... %lld,\n", | |
3283 | (long long) entry->end.value); | |
3284 | } else { | |
3285 | ret = lttng_metadata_printf(session, | |
3286 | " ... %llu,\n", | |
3287 | entry->end.value); | |
3288 | } | |
141ddf28 | 3289 | } |
7c559490 MD |
3290 | if (ret) |
3291 | goto end; | |
141ddf28 | 3292 | } |
141ddf28 MD |
3293 | } |
3294 | ret = print_tabs(session, nesting); | |
3295 | if (ret) | |
3296 | goto end; | |
ceabb767 | 3297 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3298 | end: |
3299 | return ret; | |
3300 | } | |
3301 | ||
d83004aa JD |
3302 | /* |
3303 | * Must be called with sessions_mutex held. | |
3304 | */ | |
c099397a | 3305 | static |
ceabb767 MD |
3306 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3307 | const struct lttng_event_field *field, | |
3308 | size_t nesting) | |
3309 | { | |
3310 | int ret; | |
3311 | ||
3312 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3313 | if (ret) | |
3314 | return ret; | |
3315 | return lttng_field_name_statedump(session, field, nesting); | |
3316 | } | |
3317 | ||
3318 | static | |
3319 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3320 | const struct lttng_event_field *field, | |
3321 | size_t nesting) | |
3322 | { | |
3323 | int ret; | |
3324 | ||
3325 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3326 | if (ret) | |
3327 | return ret; | |
3328 | return lttng_field_name_statedump(session, field, nesting); | |
3329 | } | |
3330 | ||
3331 | static | |
3332 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3333 | const struct lttng_type *type, | |
3334 | size_t nesting) | |
3335 | { | |
3336 | int ret; | |
3337 | ||
3338 | WARN_ON_ONCE(type->atype != atype_string); | |
3339 | /* Default encoding is UTF8 */ | |
3340 | ret = print_tabs(session, nesting); | |
3341 | if (ret) | |
3342 | return ret; | |
3343 | ret = lttng_metadata_printf(session, | |
3344 | "string%s", | |
3345 | type->u.string.encoding == lttng_encode_ASCII ? | |
3346 | " { encoding = ASCII; }" : ""); | |
3347 | return ret; | |
3348 | } | |
3349 | ||
3350 | static | |
3351 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3352 | const struct lttng_event_field *field, |
3353 | size_t nesting) | |
ceabb767 MD |
3354 | { |
3355 | int ret; | |
3356 | ||
3357 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3358 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3359 | if (ret) | |
3360 | return ret; | |
3361 | return lttng_field_name_statedump(session, field, nesting); | |
3362 | } | |
3363 | ||
3364 | /* | |
3365 | * Must be called with sessions_mutex held. | |
3366 | */ | |
3367 | static | |
3368 | int _lttng_type_statedump(struct lttng_session *session, | |
3369 | const struct lttng_type *type, | |
3370 | size_t nesting) | |
c099397a | 3371 | { |
c099397a | 3372 | int ret = 0; |
c099397a | 3373 | |
ceabb767 | 3374 | switch (type->atype) { |
8070f5c0 | 3375 | case atype_integer: |
ceabb767 | 3376 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3377 | break; |
ceabb767 MD |
3378 | case atype_enum_nestable: |
3379 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3380 | break; |
ceabb767 MD |
3381 | case atype_string: |
3382 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3383 | break; | |
3384 | case atype_struct_nestable: | |
3385 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3386 | break; |
ceabb767 MD |
3387 | case atype_variant_nestable: |
3388 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3389 | break; | |
3390 | ||
3391 | /* Nested arrays and sequences are not supported yet. */ | |
3392 | case atype_array_nestable: | |
3393 | case atype_sequence_nestable: | |
3394 | default: | |
3395 | WARN_ON_ONCE(1); | |
3396 | return -EINVAL; | |
8070f5c0 | 3397 | } |
ceabb767 MD |
3398 | return ret; |
3399 | } | |
8070f5c0 | 3400 | |
ceabb767 MD |
3401 | /* |
3402 | * Must be called with sessions_mutex held. | |
3403 | */ | |
3404 | static | |
3405 | int _lttng_field_statedump(struct lttng_session *session, | |
3406 | const struct lttng_event_field *field, | |
3407 | size_t nesting) | |
3408 | { | |
3409 | int ret = 0; | |
27d2368e | 3410 | |
ceabb767 MD |
3411 | switch (field->type.atype) { |
3412 | case atype_integer: | |
3413 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3414 | break; | |
3415 | case atype_enum_nestable: | |
3416 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3417 | break; |
8070f5c0 | 3418 | case atype_string: |
ceabb767 | 3419 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3420 | break; |
ceabb767 MD |
3421 | case atype_struct_nestable: |
3422 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3423 | break; |
ceabb767 MD |
3424 | case atype_array_nestable: |
3425 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3426 | break; |
ceabb767 MD |
3427 | case atype_sequence_nestable: |
3428 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3429 | break; |
ceabb767 MD |
3430 | case atype_variant_nestable: |
3431 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3432 | break; |
f513b2bf | 3433 | |
8070f5c0 MD |
3434 | default: |
3435 | WARN_ON_ONCE(1); | |
3436 | return -EINVAL; | |
3437 | } | |
3438 | return ret; | |
3439 | } | |
3440 | ||
3441 | static | |
a90917c3 | 3442 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3443 | struct lttng_ctx *ctx) |
3444 | { | |
3445 | int ret = 0; | |
3446 | int i; | |
3447 | ||
3448 | if (!ctx) | |
3449 | return 0; | |
3450 | for (i = 0; i < ctx->nr_fields; i++) { | |
3451 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3452 | ||
f513b2bf | 3453 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3454 | if (ret) |
3455 | return ret; | |
3456 | } | |
3457 | return ret; | |
3458 | } | |
3459 | ||
3460 | static | |
a90917c3 MD |
3461 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3462 | struct lttng_event *event) | |
8070f5c0 MD |
3463 | { |
3464 | const struct lttng_event_desc *desc = event->desc; | |
3465 | int ret = 0; | |
3466 | int i; | |
3467 | ||
3468 | for (i = 0; i < desc->nr_fields; i++) { | |
3469 | const struct lttng_event_field *field = &desc->fields[i]; | |
3470 | ||
f513b2bf | 3471 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3472 | if (ret) |
3473 | return ret; | |
c099397a MD |
3474 | } |
3475 | return ret; | |
3476 | } | |
3477 | ||
d83004aa JD |
3478 | /* |
3479 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3480 | * The entire event metadata is printed as a single atomic metadata |
3481 | * transaction. | |
d83004aa | 3482 | */ |
c099397a | 3483 | static |
a90917c3 MD |
3484 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3485 | struct lttng_channel *chan, | |
3486 | struct lttng_event *event) | |
c099397a MD |
3487 | { |
3488 | int ret = 0; | |
3489 | ||
585e5dcc | 3490 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3491 | return 0; |
d83004aa | 3492 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3493 | return 0; |
3494 | ||
8b97fd42 MD |
3495 | lttng_metadata_begin(session); |
3496 | ||
c099397a MD |
3497 | ret = lttng_metadata_printf(session, |
3498 | "event {\n" | |
ae734547 | 3499 | " name = \"%s\";\n" |
c099397a | 3500 | " id = %u;\n" |
b9074a1b | 3501 | " stream_id = %u;\n", |
c099397a MD |
3502 | event->desc->name, |
3503 | event->id, | |
3504 | event->chan->id); | |
3505 | if (ret) | |
3506 | goto end; | |
3507 | ||
b9074a1b MD |
3508 | if (event->ctx) { |
3509 | ret = lttng_metadata_printf(session, | |
3510 | " context := struct {\n"); | |
3511 | if (ret) | |
3512 | goto end; | |
3513 | } | |
a90917c3 | 3514 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3515 | if (ret) |
3516 | goto end; | |
b9074a1b MD |
3517 | if (event->ctx) { |
3518 | ret = lttng_metadata_printf(session, | |
3519 | " };\n"); | |
3520 | if (ret) | |
3521 | goto end; | |
3522 | } | |
8070f5c0 MD |
3523 | |
3524 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3525 | " fields := struct {\n" |
3526 | ); | |
3527 | if (ret) | |
3528 | goto end; | |
3529 | ||
a90917c3 | 3530 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3531 | if (ret) |
3532 | goto end; | |
3533 | ||
3534 | /* | |
3535 | * LTTng space reservation can only reserve multiples of the | |
3536 | * byte size. | |
3537 | */ | |
3538 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3539 | " };\n" |
3540 | "};\n\n"); | |
c099397a MD |
3541 | if (ret) |
3542 | goto end; | |
3543 | ||
c099397a MD |
3544 | event->metadata_dumped = 1; |
3545 | end: | |
8b97fd42 | 3546 | lttng_metadata_end(session); |
c099397a MD |
3547 | return ret; |
3548 | ||
3549 | } | |
3550 | ||
d83004aa JD |
3551 | /* |
3552 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3553 | * The entire channel metadata is printed as a single atomic metadata |
3554 | * transaction. | |
d83004aa | 3555 | */ |
c099397a | 3556 | static |
a90917c3 MD |
3557 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3558 | struct lttng_channel *chan) | |
c099397a MD |
3559 | { |
3560 | int ret = 0; | |
3561 | ||
585e5dcc | 3562 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3563 | return 0; |
d83004aa JD |
3564 | |
3565 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3566 | return 0; |
3567 | ||
8b97fd42 MD |
3568 | lttng_metadata_begin(session); |
3569 | ||
c099397a MD |
3570 | WARN_ON_ONCE(!chan->header_type); |
3571 | ret = lttng_metadata_printf(session, | |
3572 | "stream {\n" | |
3573 | " id = %u;\n" | |
9115fbdc | 3574 | " event.header := %s;\n" |
b9074a1b | 3575 | " packet.context := struct packet_context;\n", |
c099397a MD |
3576 | chan->id, |
3577 | chan->header_type == 1 ? "struct event_header_compact" : | |
3578 | "struct event_header_large"); | |
3579 | if (ret) | |
3580 | goto end; | |
3581 | ||
b9074a1b MD |
3582 | if (chan->ctx) { |
3583 | ret = lttng_metadata_printf(session, | |
3584 | " event.context := struct {\n"); | |
3585 | if (ret) | |
3586 | goto end; | |
3587 | } | |
a90917c3 | 3588 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3589 | if (ret) |
3590 | goto end; | |
b9074a1b MD |
3591 | if (chan->ctx) { |
3592 | ret = lttng_metadata_printf(session, | |
3593 | " };\n"); | |
3594 | if (ret) | |
3595 | goto end; | |
3596 | } | |
8070f5c0 MD |
3597 | |
3598 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3599 | "};\n\n"); |
8070f5c0 | 3600 | |
c099397a MD |
3601 | chan->metadata_dumped = 1; |
3602 | end: | |
8b97fd42 | 3603 | lttng_metadata_end(session); |
c099397a MD |
3604 | return ret; |
3605 | } | |
3606 | ||
d83004aa JD |
3607 | /* |
3608 | * Must be called with sessions_mutex held. | |
3609 | */ | |
9115fbdc | 3610 | static |
a90917c3 | 3611 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3612 | { |
3613 | return lttng_metadata_printf(session, | |
3614 | "struct packet_context {\n" | |
a3ccff4f MD |
3615 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3616 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3617 | " uint64_t content_size;\n" |
3618 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3619 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3620 | " unsigned long events_discarded;\n" |
9115fbdc | 3621 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3622 | "};\n\n" |
9115fbdc MD |
3623 | ); |
3624 | } | |
3625 | ||
3626 | /* | |
3627 | * Compact header: | |
3628 | * id: range: 0 - 30. | |
3629 | * id 31 is reserved to indicate an extended header. | |
3630 | * | |
3631 | * Large header: | |
3632 | * id: range: 0 - 65534. | |
3633 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3634 | * |
3635 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3636 | */ |
3637 | static | |
a90917c3 | 3638 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3639 | { |
3640 | return lttng_metadata_printf(session, | |
3641 | "struct event_header_compact {\n" | |
3642 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3643 | " variant <id> {\n" | |
3644 | " struct {\n" | |
a3ccff4f | 3645 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3646 | " } compact;\n" |
3647 | " struct {\n" | |
3648 | " uint32_t id;\n" | |
a3ccff4f | 3649 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3650 | " } extended;\n" |
3651 | " } v;\n" | |
3652 | "} align(%u);\n" | |
3653 | "\n" | |
3654 | "struct event_header_large {\n" | |
3655 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3656 | " variant <id> {\n" | |
3657 | " struct {\n" | |
a3ccff4f | 3658 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3659 | " } compact;\n" |
3660 | " struct {\n" | |
3661 | " uint32_t id;\n" | |
a3ccff4f | 3662 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3663 | " } extended;\n" |
3664 | " } v;\n" | |
3665 | "} align(%u);\n\n", | |
a90917c3 MD |
3666 | lttng_alignof(uint32_t) * CHAR_BIT, |
3667 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3668 | ); |
3669 | } | |
3670 | ||
a3ccff4f MD |
3671 | /* |
3672 | * Approximation of NTP time of day to clock monotonic correlation, | |
3673 | * taken at start of trace. | |
3674 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3675 | * in future versions. | |
5283350b MD |
3676 | * This function may return a negative offset. It may happen if the |
3677 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3678 | * |
3679 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3680 | * y2038 compliant. | |
a3ccff4f MD |
3681 | */ |
3682 | static | |
8967b2a3 | 3683 | int64_t measure_clock_offset(void) |
a3ccff4f | 3684 | { |
dcb93448 | 3685 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3686 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3687 | int64_t offset; |
a3ccff4f | 3688 | unsigned long flags; |
3636085f MJ |
3689 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3690 | struct timespec64 rts = { 0, 0 }; | |
3691 | #else | |
3692 | struct timespec rts = { 0, 0 }; | |
3693 | #endif | |
a3ccff4f MD |
3694 | |
3695 | /* Disable interrupts to increase correlation precision. */ | |
3696 | local_irq_save(flags); | |
3697 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3698 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3699 | ktime_get_real_ts64(&rts); | |
3700 | #else | |
216b6baa | 3701 | getnstimeofday(&rts); |
3636085f | 3702 | #endif |
a3ccff4f MD |
3703 | monotonic[1] = trace_clock_read64(); |
3704 | local_irq_restore(flags); | |
3705 | ||
dcb93448 | 3706 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3707 | realtime = (uint64_t) rts.tv_sec * tcf; |
3708 | if (tcf == NSEC_PER_SEC) { | |
3709 | realtime += rts.tv_nsec; | |
3710 | } else { | |
3711 | uint64_t n = rts.tv_nsec * tcf; | |
3712 | ||
3713 | do_div(n, NSEC_PER_SEC); | |
3714 | realtime += n; | |
3715 | } | |
dcb93448 | 3716 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3717 | return offset; |
3718 | } | |
3719 | ||
3eb95be4 JR |
3720 | static |
3721 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3722 | { | |
0f3eaad4 | 3723 | int ret = 0; |
3eb95be4 JR |
3724 | size_t i; |
3725 | char cur; | |
3726 | ||
3727 | i = 0; | |
3728 | cur = string[i]; | |
3729 | while (cur != '\0') { | |
3730 | switch (cur) { | |
3731 | case '\n': | |
3732 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3733 | break; | |
3734 | case '\\': | |
3735 | case '"': | |
3736 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3737 | if (ret) | |
3738 | goto error; | |
3739 | /* We still print the current char */ | |
3740 | /* Fallthrough */ | |
3741 | default: | |
3742 | ret = lttng_metadata_printf(session, "%c", cur); | |
3743 | break; | |
3744 | } | |
3745 | ||
3746 | if (ret) | |
3747 | goto error; | |
3748 | ||
3749 | cur = string[++i]; | |
3750 | } | |
3751 | error: | |
3752 | return ret; | |
3753 | } | |
3754 | ||
3755 | static | |
1c88f269 JR |
3756 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3757 | const char *field_value) | |
3eb95be4 JR |
3758 | { |
3759 | int ret; | |
3760 | ||
1c88f269 | 3761 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3762 | if (ret) |
3763 | goto error; | |
3764 | ||
1c88f269 | 3765 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3766 | if (ret) |
3767 | goto error; | |
3768 | ||
3769 | ret = lttng_metadata_printf(session, "\";\n"); | |
3770 | ||
3771 | error: | |
3772 | return ret; | |
3773 | } | |
3774 | ||
c099397a MD |
3775 | /* |
3776 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3777 | * Must be called with sessions_mutex held. |
c099397a MD |
3778 | */ |
3779 | static | |
a90917c3 | 3780 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3781 | { |
30bdb6e4 | 3782 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3783 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3784 | const char *product_uuid; |
a90917c3 MD |
3785 | struct lttng_channel *chan; |
3786 | struct lttng_event *event; | |
c099397a MD |
3787 | int ret = 0; |
3788 | ||
585e5dcc | 3789 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3790 | return 0; |
8b97fd42 MD |
3791 | |
3792 | lttng_metadata_begin(session); | |
3793 | ||
c099397a MD |
3794 | if (session->metadata_dumped) |
3795 | goto skip_session; | |
c099397a | 3796 | |
d793d5e1 | 3797 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3798 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3799 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3800 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3801 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3802 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3803 | |
3804 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3805 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3806 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3807 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3808 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3809 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3810 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3811 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3812 | "\n" |
3813 | "trace {\n" | |
3814 | " major = %u;\n" | |
3815 | " minor = %u;\n" | |
30bdb6e4 | 3816 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3817 | " byte_order = %s;\n" |
3818 | " packet.header := struct {\n" | |
3819 | " uint32_t magic;\n" | |
1ec3f75a | 3820 | " uint8_t uuid[16];\n" |
d793d5e1 | 3821 | " uint32_t stream_id;\n" |
5594698f | 3822 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3823 | " };\n" |
d793d5e1 | 3824 | "};\n\n", |
a90917c3 MD |
3825 | lttng_alignof(uint8_t) * CHAR_BIT, |
3826 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3827 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3828 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3829 | sizeof(unsigned long) * CHAR_BIT, |
3830 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3831 | CTF_SPEC_MAJOR, |
3832 | CTF_SPEC_MINOR, | |
d793d5e1 | 3833 | uuid_s, |
5214fa50 | 3834 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3835 | "be" |
3836 | #else | |
3837 | "le" | |
3838 | #endif | |
3839 | ); | |
3840 | if (ret) | |
3841 | goto end; | |
3842 | ||
99dc9597 MD |
3843 | ret = lttng_metadata_printf(session, |
3844 | "env {\n" | |
a6058143 | 3845 | " hostname = \"%s\";\n" |
c6c9e10f | 3846 | " domain = \"kernel\";\n" |
99dc9597 | 3847 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3848 | " kernel_release = \"%s\";\n" |
3849 | " kernel_version = \"%s\";\n" | |
3850 | " tracer_name = \"lttng-modules\";\n" | |
3851 | " tracer_major = %d;\n" | |
3852 | " tracer_minor = %d;\n" | |
3853 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3854 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3855 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3856 | utsname()->sysname, |
3857 | utsname()->release, | |
c6c9e10f MD |
3858 | utsname()->version, |
3859 | LTTNG_MODULES_MAJOR_VERSION, | |
3860 | LTTNG_MODULES_MINOR_VERSION, | |
3861 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3862 | ); |
3863 | if (ret) | |
3864 | goto end; | |
3865 | ||
1c88f269 JR |
3866 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3867 | if (ret) | |
3868 | goto end; | |
3869 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3870 | session->creation_time); | |
3eb95be4 JR |
3871 | if (ret) |
3872 | goto end; | |
3873 | ||
c88f762e GB |
3874 | /* Add the product UUID to the 'env' section */ |
3875 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3876 | if (product_uuid) { | |
3877 | ret = lttng_metadata_printf(session, | |
3878 | " product_uuid = \"%s\";\n", | |
3879 | product_uuid | |
3880 | ); | |
3881 | if (ret) | |
3882 | goto end; | |
3883 | } | |
3884 | ||
3885 | /* Close the 'env' section */ | |
3eb95be4 JR |
3886 | ret = lttng_metadata_printf(session, "};\n\n"); |
3887 | if (ret) | |
3888 | goto end; | |
3889 | ||
a3ccff4f MD |
3890 | ret = lttng_metadata_printf(session, |
3891 | "clock {\n" | |
2754583e MD |
3892 | " name = \"%s\";\n", |
3893 | trace_clock_name() | |
a82c63f1 MD |
3894 | ); |
3895 | if (ret) | |
3896 | goto end; | |
3897 | ||
3898 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3899 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3900 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3901 | clock_uuid_s |
3902 | ); | |
3903 | if (ret) | |
3904 | goto end; | |
3905 | } | |
3906 | ||
3907 | ret = lttng_metadata_printf(session, | |
2754583e | 3908 | " description = \"%s\";\n" |
a3ccff4f MD |
3909 | " freq = %llu; /* Frequency, in Hz */\n" |
3910 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3911 | " offset = %lld;\n" |
a3ccff4f | 3912 | "};\n\n", |
2754583e | 3913 | trace_clock_description(), |
a3ccff4f | 3914 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3915 | (long long) measure_clock_offset() |
a3ccff4f MD |
3916 | ); |
3917 | if (ret) | |
3918 | goto end; | |
3919 | ||
3920 | ret = lttng_metadata_printf(session, | |
3921 | "typealias integer {\n" | |
3922 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3923 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3924 | "} := uint27_clock_monotonic_t;\n" |
3925 | "\n" | |
3926 | "typealias integer {\n" | |
3927 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3928 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3929 | "} := uint32_clock_monotonic_t;\n" |
3930 | "\n" | |
3931 | "typealias integer {\n" | |
3932 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3933 | " map = clock.%s.value;\n" |
a3ccff4f | 3934 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3935 | trace_clock_name(), |
a3ccff4f | 3936 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3937 | trace_clock_name(), |
3938 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3939 | trace_clock_name() | |
a3ccff4f MD |
3940 | ); |
3941 | if (ret) | |
3942 | goto end; | |
3943 | ||
a90917c3 | 3944 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3945 | if (ret) |
3946 | goto end; | |
3947 | ||
a90917c3 | 3948 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3949 | if (ret) |
3950 | goto end; | |
3951 | ||
c099397a MD |
3952 | skip_session: |
3953 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3954 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3955 | if (ret) |
3956 | goto end; | |
3957 | } | |
3958 | ||
3959 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3960 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3961 | if (ret) |
3962 | goto end; | |
3963 | } | |
3964 | session->metadata_dumped = 1; | |
3965 | end: | |
8b97fd42 | 3966 | lttng_metadata_end(session); |
c099397a MD |
3967 | return ret; |
3968 | } | |
3969 | ||
c0e31d2e | 3970 | /** |
a90917c3 | 3971 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3972 | * @transport: transport structure |
3973 | * | |
3974 | * Registers a transport which can be used as output to extract the data out of | |
3975 | * LTTng. The module calling this registration function must ensure that no | |
3976 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3977 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3978 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3979 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3980 | * after its registration must it synchronize the TLBs. |
3981 | */ | |
a90917c3 | 3982 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3983 | { |
3984 | /* | |
3985 | * Make sure no page fault can be triggered by the module about to be | |
3986 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3987 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3988 | */ |
263b6c88 | 3989 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3990 | |
3991 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3992 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3993 | mutex_unlock(&sessions_mutex); |
3994 | } | |
a90917c3 | 3995 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3996 | |
3997 | /** | |
a90917c3 | 3998 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3999 | * @transport: transport structure |
4000 | */ | |
a90917c3 | 4001 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4002 | { |
4003 | mutex_lock(&sessions_mutex); | |
4004 | list_del(&transport->node); | |
4005 | mutex_unlock(&sessions_mutex); | |
4006 | } | |
a90917c3 | 4007 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4008 | |
a101fa10 MD |
4009 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4010 | { | |
4011 | /* | |
4012 | * Make sure no page fault can be triggered by the module about to be | |
4013 | * registered. We deal with this here so we don't have to call | |
4014 | * vmalloc_sync_mappings() in each module's init. | |
4015 | */ | |
4016 | wrapper_vmalloc_sync_mappings(); | |
4017 | ||
4018 | mutex_lock(&sessions_mutex); | |
4019 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4020 | mutex_unlock(&sessions_mutex); | |
4021 | } | |
4022 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4023 | ||
4024 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4025 | { | |
4026 | mutex_lock(&sessions_mutex); | |
4027 | list_del(&transport->node); | |
4028 | mutex_unlock(&sessions_mutex); | |
4029 | } | |
4030 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4031 | ||
5f4c791e | 4032 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4033 | |
4034 | enum cpuhp_state lttng_hp_prepare; | |
4035 | enum cpuhp_state lttng_hp_online; | |
4036 | ||
4037 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4038 | { | |
4039 | struct lttng_cpuhp_node *lttng_node; | |
4040 | ||
4041 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4042 | switch (lttng_node->component) { | |
4043 | case LTTNG_RING_BUFFER_FRONTEND: | |
4044 | return 0; | |
4045 | case LTTNG_RING_BUFFER_BACKEND: | |
4046 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4047 | case LTTNG_RING_BUFFER_ITER: | |
4048 | return 0; | |
4049 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4050 | return 0; | |
4051 | default: | |
4052 | return -EINVAL; | |
4053 | } | |
4054 | } | |
4055 | ||
4056 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4057 | { | |
4058 | struct lttng_cpuhp_node *lttng_node; | |
4059 | ||
4060 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4061 | switch (lttng_node->component) { | |
4062 | case LTTNG_RING_BUFFER_FRONTEND: | |
4063 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4064 | case LTTNG_RING_BUFFER_BACKEND: | |
4065 | return 0; | |
4066 | case LTTNG_RING_BUFFER_ITER: | |
4067 | return 0; | |
4068 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4069 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4070 | default: | |
4071 | return -EINVAL; | |
4072 | } | |
4073 | } | |
4074 | ||
4075 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4076 | { | |
4077 | struct lttng_cpuhp_node *lttng_node; | |
4078 | ||
4079 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4080 | switch (lttng_node->component) { | |
4081 | case LTTNG_RING_BUFFER_FRONTEND: | |
4082 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4083 | case LTTNG_RING_BUFFER_BACKEND: | |
4084 | return 0; | |
4085 | case LTTNG_RING_BUFFER_ITER: | |
4086 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4087 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4088 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4089 | default: | |
4090 | return -EINVAL; | |
4091 | } | |
4092 | } | |
4093 | ||
4094 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4095 | { | |
4096 | struct lttng_cpuhp_node *lttng_node; | |
4097 | ||
4098 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4099 | switch (lttng_node->component) { | |
4100 | case LTTNG_RING_BUFFER_FRONTEND: | |
4101 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4102 | case LTTNG_RING_BUFFER_BACKEND: | |
4103 | return 0; | |
4104 | case LTTNG_RING_BUFFER_ITER: | |
4105 | return 0; | |
4106 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4107 | return 0; | |
4108 | default: | |
4109 | return -EINVAL; | |
4110 | } | |
4111 | } | |
4112 | ||
4113 | static int __init lttng_init_cpu_hotplug(void) | |
4114 | { | |
4115 | int ret; | |
4116 | ||
4117 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4118 | lttng_hotplug_prepare, | |
4119 | lttng_hotplug_dead); | |
4120 | if (ret < 0) { | |
4121 | return ret; | |
4122 | } | |
4123 | lttng_hp_prepare = ret; | |
4124 | lttng_rb_set_hp_prepare(ret); | |
4125 | ||
4126 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4127 | lttng_hotplug_online, | |
4128 | lttng_hotplug_offline); | |
4129 | if (ret < 0) { | |
4130 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4131 | lttng_hp_prepare = 0; | |
4132 | return ret; | |
4133 | } | |
4134 | lttng_hp_online = ret; | |
4135 | lttng_rb_set_hp_online(ret); | |
4136 | ||
4137 | return 0; | |
4138 | } | |
4139 | ||
4140 | static void __exit lttng_exit_cpu_hotplug(void) | |
4141 | { | |
4142 | lttng_rb_set_hp_online(0); | |
4143 | cpuhp_remove_multi_state(lttng_hp_online); | |
4144 | lttng_rb_set_hp_prepare(0); | |
4145 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4146 | } | |
4147 | ||
5f4c791e | 4148 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4149 | static int lttng_init_cpu_hotplug(void) |
4150 | { | |
4151 | return 0; | |
4152 | } | |
4153 | static void lttng_exit_cpu_hotplug(void) | |
4154 | { | |
4155 | } | |
5f4c791e | 4156 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4157 | |
4158 | ||
a90917c3 | 4159 | static int __init lttng_events_init(void) |
4e3c1b9b | 4160 | { |
1c25284c MD |
4161 | int ret; |
4162 | ||
453b2495 JD |
4163 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4164 | if (ret) | |
4165 | return ret; | |
389d7070 | 4166 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4167 | if (ret) |
4168 | return ret; | |
4169 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4170 | if (ret) |
4171 | return ret; | |
4172 | ret = lttng_probes_init(); | |
389d7070 MD |
4173 | if (ret) |
4174 | return ret; | |
07dfc1d0 | 4175 | ret = lttng_context_init(); |
20591cf7 MD |
4176 | if (ret) |
4177 | return ret; | |
07dfc1d0 MD |
4178 | ret = lttng_tracepoint_init(); |
4179 | if (ret) | |
4180 | goto error_tp; | |
a90917c3 | 4181 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4182 | if (!event_cache) { |
4183 | ret = -ENOMEM; | |
dffef45d FD |
4184 | goto error_kmem_event; |
4185 | } | |
4186 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4187 | if (!event_notifier_cache) { | |
4188 | ret = -ENOMEM; | |
4189 | goto error_kmem_event_notifier; | |
20591cf7 | 4190 | } |
80996790 | 4191 | ret = lttng_abi_init(); |
02119ee5 MD |
4192 | if (ret) |
4193 | goto error_abi; | |
0c956676 MD |
4194 | ret = lttng_logger_init(); |
4195 | if (ret) | |
4196 | goto error_logger; | |
1e367326 MD |
4197 | ret = lttng_init_cpu_hotplug(); |
4198 | if (ret) | |
4199 | goto error_hotplug; | |
101215b7 | 4200 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4201 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4202 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4203 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4204 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4205 | LTTNG_VERSION_NAME, |
4206 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4207 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4208 | #else | |
4209 | "", | |
4210 | #endif | |
4211 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4212 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4213 | #else | |
4214 | ""); | |
4215 | #endif | |
4e3c1b9b | 4216 | return 0; |
0c956676 | 4217 | |
1e367326 MD |
4218 | error_hotplug: |
4219 | lttng_logger_exit(); | |
0c956676 MD |
4220 | error_logger: |
4221 | lttng_abi_exit(); | |
02119ee5 | 4222 | error_abi: |
dffef45d FD |
4223 | kmem_cache_destroy(event_notifier_cache); |
4224 | error_kmem_event_notifier: | |
1c25284c | 4225 | kmem_cache_destroy(event_cache); |
dffef45d | 4226 | error_kmem_event: |
20591cf7 | 4227 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4228 | error_tp: |
4229 | lttng_context_exit(); | |
101215b7 | 4230 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4231 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4232 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4233 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4234 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4235 | LTTNG_VERSION_NAME, |
4236 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4237 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4238 | #else | |
4239 | "", | |
4240 | #endif | |
4241 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4242 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4243 | #else | |
4244 | ""); | |
4245 | #endif | |
1c25284c | 4246 | return ret; |
4e3c1b9b MD |
4247 | } |
4248 | ||
a90917c3 | 4249 | module_init(lttng_events_init); |
11b5a3c2 | 4250 | |
a90917c3 | 4251 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4252 | { |
a90917c3 | 4253 | struct lttng_session *session, *tmpsession; |
92e94819 | 4254 | |
1e367326 | 4255 | lttng_exit_cpu_hotplug(); |
0c956676 | 4256 | lttng_logger_exit(); |
80996790 | 4257 | lttng_abi_exit(); |
92e94819 | 4258 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4259 | lttng_session_destroy(session); |
11b5a3c2 | 4260 | kmem_cache_destroy(event_cache); |
dffef45d | 4261 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4262 | lttng_tracepoint_exit(); |
07dfc1d0 | 4263 | lttng_context_exit(); |
101215b7 | 4264 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4265 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4266 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4267 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4268 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4269 | LTTNG_VERSION_NAME, |
4270 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4271 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4272 | #else | |
4273 | "", | |
4274 | #endif | |
4275 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4276 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4277 | #else | |
4278 | ""); | |
4279 | #endif | |
4e3c1b9b | 4280 | } |
92e94819 | 4281 | |
a90917c3 | 4282 | module_exit(lttng_events_exit); |
11b5a3c2 | 4283 | |
7ca11e77 | 4284 | #include <generated/patches.h> |
101215b7 MJ |
4285 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4286 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4287 | #endif | |
4288 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4289 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4290 | #endif | |
92e94819 MD |
4291 | MODULE_LICENSE("GPL and additional rights"); |
4292 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4293 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4294 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4295 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4296 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4297 | LTTNG_MODULES_EXTRAVERSION); |