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> | |
39 | #include <lttng/tracer.h> | |
21f58fb7 | 40 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
41 | #include <lttng/abi-old.h> |
42 | #include <lttng/endian.h> | |
43 | #include <lttng/string-utils.h> | |
4a11ef1c | 44 | #include <lttng/utils.h> |
24591303 MD |
45 | #include <ringbuffer/backend.h> |
46 | #include <ringbuffer/frontend.h> | |
3636085f | 47 | #include <wrapper/time.h> |
4e3c1b9b | 48 | |
d83004aa JD |
49 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
50 | ||
4e3c1b9b | 51 | static LIST_HEAD(sessions); |
750b05f2 | 52 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 53 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
54 | /* |
55 | * Protect the sessions and metadata caches. | |
56 | */ | |
4e3c1b9b MD |
57 | static DEFINE_MUTEX(sessions_mutex); |
58 | static struct kmem_cache *event_cache; | |
dffef45d | 59 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 60 | |
b2bc0bc8 FD |
61 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
62 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
63 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 64 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 65 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 66 | |
a90917c3 | 67 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 68 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
69 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
70 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 71 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 72 | static |
a90917c3 MD |
73 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
74 | struct lttng_channel *chan, | |
75 | struct lttng_event *event); | |
c099397a | 76 | static |
a90917c3 | 77 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
78 | static |
79 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 80 | static |
ceabb767 MD |
81 | int _lttng_type_statedump(struct lttng_session *session, |
82 | const struct lttng_type *type, | |
83 | size_t nesting); | |
84 | static | |
f513b2bf MD |
85 | int _lttng_field_statedump(struct lttng_session *session, |
86 | const struct lttng_event_field *field, | |
87 | size_t nesting); | |
c099397a | 88 | |
c099397a | 89 | void synchronize_trace(void) |
abcca994 | 90 | { |
92da05ce MJ |
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
92 | synchronize_rcu(); | |
93 | #else | |
abcca994 | 94 | synchronize_sched(); |
92da05ce MJ |
95 | #endif |
96 | ||
b8590f40 MD |
97 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
98 | #ifdef CONFIG_PREEMPT_RT_FULL | |
99 | synchronize_rcu(); | |
100 | #endif | |
101 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
102 | #ifdef CONFIG_PREEMPT_RT |
103 | synchronize_rcu(); | |
104 | #endif | |
b8590f40 | 105 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
106 | } |
107 | ||
3c997079 MD |
108 | void lttng_lock_sessions(void) |
109 | { | |
110 | mutex_lock(&sessions_mutex); | |
111 | } | |
112 | ||
113 | void lttng_unlock_sessions(void) | |
114 | { | |
115 | mutex_unlock(&sessions_mutex); | |
116 | } | |
117 | ||
9fe593d2 FD |
118 | static struct lttng_transport *lttng_transport_find(const char *name) |
119 | { | |
120 | struct lttng_transport *transport; | |
121 | ||
122 | list_for_each_entry(transport, <tng_transport_list, node) { | |
123 | if (!strcmp(transport->name, name)) | |
124 | return transport; | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
3c997079 MD |
129 | /* |
130 | * Called with sessions lock held. | |
131 | */ | |
132 | int lttng_session_active(void) | |
133 | { | |
134 | struct lttng_session *iter; | |
135 | ||
136 | list_for_each_entry(iter, &sessions, list) { | |
137 | if (iter->active) | |
138 | return 1; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
a90917c3 | 143 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 144 | { |
a90917c3 | 145 | struct lttng_session *session; |
d83004aa | 146 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 147 | int i; |
4e3c1b9b MD |
148 | |
149 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 150 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 151 | if (!session) |
d83004aa | 152 | goto err; |
4e3c1b9b | 153 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 154 | INIT_LIST_HEAD(&session->events); |
a7008254 | 155 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
156 | |
157 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
158 | GFP_KERNEL); | |
159 | if (!metadata_cache) | |
160 | goto err_free_session; | |
0ca42eb7 | 161 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
162 | if (!metadata_cache->data) |
163 | goto err_free_cache; | |
164 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
165 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 166 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
167 | session->metadata_cache = metadata_cache; |
168 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
169 | memcpy(&metadata_cache->uuid, &session->uuid, |
170 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
171 | INIT_LIST_HEAD(&session->enablers_head); |
172 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
173 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 174 | list_add(&session->list, &sessions); |
d1f652f8 MD |
175 | session->pid_tracker.session = session; |
176 | session->pid_tracker.tracker_type = TRACKER_PID; | |
177 | session->vpid_tracker.session = session; | |
178 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
179 | session->uid_tracker.session = session; | |
180 | session->uid_tracker.tracker_type = TRACKER_UID; | |
181 | session->vuid_tracker.session = session; | |
182 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
183 | session->gid_tracker.session = session; | |
184 | session->gid_tracker.tracker_type = TRACKER_GID; | |
185 | session->vgid_tracker.session = session; | |
186 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
187 | mutex_unlock(&sessions_mutex); |
188 | return session; | |
d83004aa JD |
189 | |
190 | err_free_cache: | |
191 | kfree(metadata_cache); | |
192 | err_free_session: | |
48f5e0b5 | 193 | lttng_kvfree(session); |
d83004aa JD |
194 | err: |
195 | mutex_unlock(&sessions_mutex); | |
196 | return NULL; | |
197 | } | |
198 | ||
750b05f2 FD |
199 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
200 | { | |
201 | struct lttng_transport *transport = NULL; | |
202 | struct lttng_event_notifier_group *event_notifier_group; | |
203 | const char *transport_name = "relay-event-notifier"; | |
204 | size_t subbuf_size = 4096; //TODO | |
205 | size_t num_subbuf = 16; //TODO | |
206 | unsigned int switch_timer_interval = 0; | |
207 | unsigned int read_timer_interval = 0; | |
dffef45d | 208 | int i; |
750b05f2 FD |
209 | |
210 | mutex_lock(&sessions_mutex); | |
211 | ||
212 | transport = lttng_transport_find(transport_name); | |
213 | if (!transport) { | |
214 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
215 | transport_name); | |
216 | goto notransport; | |
217 | } | |
218 | if (!try_module_get(transport->owner)) { | |
219 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
220 | transport_name); | |
221 | goto notransport; | |
222 | } | |
223 | ||
224 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
225 | GFP_KERNEL); | |
226 | if (!event_notifier_group) | |
227 | goto nomem; | |
228 | ||
229 | /* | |
230 | * Initialize the ring buffer used to store event notifier | |
231 | * notifications. | |
232 | */ | |
233 | event_notifier_group->ops = &transport->ops; | |
234 | event_notifier_group->chan = transport->ops.channel_create( | |
235 | transport_name, event_notifier_group, NULL, | |
236 | subbuf_size, num_subbuf, switch_timer_interval, | |
237 | read_timer_interval); | |
238 | if (!event_notifier_group->chan) | |
239 | goto create_error; | |
240 | ||
241 | event_notifier_group->transport = transport; | |
dffef45d FD |
242 | |
243 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
244 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
245 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
246 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
247 | ||
750b05f2 FD |
248 | list_add(&event_notifier_group->node, &event_notifier_groups); |
249 | ||
250 | mutex_unlock(&sessions_mutex); | |
251 | ||
252 | return event_notifier_group; | |
253 | ||
254 | create_error: | |
255 | lttng_kvfree(event_notifier_group); | |
256 | nomem: | |
257 | if (transport) | |
258 | module_put(transport->owner); | |
259 | notransport: | |
260 | mutex_unlock(&sessions_mutex); | |
261 | return NULL; | |
262 | } | |
263 | ||
d83004aa JD |
264 | void metadata_cache_destroy(struct kref *kref) |
265 | { | |
266 | struct lttng_metadata_cache *cache = | |
267 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 268 | vfree(cache->data); |
d83004aa | 269 | kfree(cache); |
4e3c1b9b MD |
270 | } |
271 | ||
a90917c3 | 272 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 273 | { |
a90917c3 MD |
274 | struct lttng_channel *chan, *tmpchan; |
275 | struct lttng_event *event, *tmpevent; | |
d83004aa | 276 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 277 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 278 | int ret; |
4e3c1b9b MD |
279 | |
280 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 281 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 282 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 283 | ret = lttng_syscalls_unregister_event(chan); |
1ec65de1 MD |
284 | WARN_ON(ret); |
285 | } | |
dda6a249 | 286 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 287 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
288 | WARN_ON(ret); |
289 | } | |
abcca994 | 290 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 291 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 292 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
293 | WARN_ON(ret); |
294 | } | |
b2bc0bc8 | 295 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 296 | &session->enablers_head, node) |
b2bc0bc8 | 297 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 298 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 299 | _lttng_event_destroy(event); |
d83004aa JD |
300 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
301 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 302 | _lttng_channel_destroy(chan); |
d83004aa | 303 | } |
ab036a63 | 304 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
305 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
306 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 307 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
308 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
309 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
310 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
311 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
312 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
313 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 314 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
315 | list_del(&session->list); |
316 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 317 | lttng_kvfree(session); |
4e3c1b9b MD |
318 | } |
319 | ||
dffef45d FD |
320 | void lttng_event_notifier_group_destroy( |
321 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 322 | { |
dffef45d FD |
323 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
324 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
325 | int ret; | |
326 | ||
750b05f2 FD |
327 | if (!event_notifier_group) |
328 | return; | |
329 | ||
330 | mutex_lock(&sessions_mutex); | |
dffef45d | 331 | |
8ced8896 FD |
332 | ret = lttng_syscalls_unregister_event_notifier(event_notifier_group); |
333 | WARN_ON(ret); | |
334 | ||
dffef45d FD |
335 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
336 | &event_notifier_group->event_notifiers_head, list) { | |
337 | ret = _lttng_event_notifier_unregister(event_notifier); | |
338 | WARN_ON(ret); | |
339 | } | |
340 | ||
b01155ba FD |
341 | /* Wait for in-flight event notifier to complete */ |
342 | synchronize_trace(); | |
343 | ||
21f58fb7 FD |
344 | irq_work_sync(&event_notifier_group->wakeup_pending); |
345 | ||
dffef45d FD |
346 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
347 | &event_notifier_group->enablers_head, node) | |
348 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
349 | ||
350 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
351 | &event_notifier_group->event_notifiers_head, list) | |
352 | _lttng_event_notifier_destroy(event_notifier); | |
353 | ||
750b05f2 FD |
354 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
355 | module_put(event_notifier_group->transport->owner); | |
356 | list_del(&event_notifier_group->node); | |
dffef45d | 357 | |
750b05f2 FD |
358 | mutex_unlock(&sessions_mutex); |
359 | lttng_kvfree(event_notifier_group); | |
360 | } | |
361 | ||
601252cf MD |
362 | int lttng_session_statedump(struct lttng_session *session) |
363 | { | |
364 | int ret; | |
365 | ||
366 | mutex_lock(&sessions_mutex); | |
367 | ret = lttng_statedump_start(session); | |
368 | mutex_unlock(&sessions_mutex); | |
369 | return ret; | |
370 | } | |
371 | ||
a90917c3 | 372 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
373 | { |
374 | int ret = 0; | |
a90917c3 | 375 | struct lttng_channel *chan; |
c0e31d2e MD |
376 | |
377 | mutex_lock(&sessions_mutex); | |
378 | if (session->active) { | |
379 | ret = -EBUSY; | |
380 | goto end; | |
381 | } | |
c099397a | 382 | |
3c997079 MD |
383 | /* Set transient enabler state to "enabled" */ |
384 | session->tstate = 1; | |
385 | ||
4ef81e4a | 386 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 387 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 388 | |
c099397a MD |
389 | /* |
390 | * Snapshot the number of events per channel to know the type of header | |
391 | * we need to use. | |
392 | */ | |
393 | list_for_each_entry(chan, &session->chan, list) { | |
394 | if (chan->header_type) | |
395 | continue; /* don't change it if session stop/restart */ | |
396 | if (chan->free_event_id < 31) | |
397 | chan->header_type = 1; /* compact */ | |
398 | else | |
399 | chan->header_type = 2; /* large */ | |
400 | } | |
401 | ||
64af2437 | 402 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
403 | list_for_each_entry(chan, &session->chan, list) { |
404 | if (chan->channel_type != METADATA_CHANNEL) | |
405 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
406 | } | |
64af2437 | 407 | |
a8f2d0c7 MJ |
408 | WRITE_ONCE(session->active, 1); |
409 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 410 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 411 | if (ret) { |
a8f2d0c7 | 412 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
413 | goto end; |
414 | } | |
415 | ret = lttng_statedump_start(session); | |
360f38ea | 416 | if (ret) |
a8f2d0c7 | 417 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
418 | end: |
419 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 420 | return ret; |
c0e31d2e MD |
421 | } |
422 | ||
a90917c3 | 423 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
424 | { |
425 | int ret = 0; | |
64af2437 | 426 | struct lttng_channel *chan; |
c0e31d2e MD |
427 | |
428 | mutex_lock(&sessions_mutex); | |
429 | if (!session->active) { | |
430 | ret = -EBUSY; | |
431 | goto end; | |
432 | } | |
a8f2d0c7 | 433 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
434 | |
435 | /* Set transient enabler state to "disabled" */ | |
436 | session->tstate = 0; | |
b2bc0bc8 | 437 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
438 | |
439 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
440 | list_for_each_entry(chan, &session->chan, list) { |
441 | if (chan->channel_type != METADATA_CHANNEL) | |
442 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
443 | } | |
c0e31d2e MD |
444 | end: |
445 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 446 | return ret; |
c0e31d2e MD |
447 | } |
448 | ||
9616f0bf JD |
449 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
450 | { | |
451 | int ret = 0; | |
452 | struct lttng_channel *chan; | |
453 | struct lttng_event *event; | |
454 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
455 | struct lttng_metadata_stream *stream; | |
456 | ||
457 | mutex_lock(&sessions_mutex); | |
458 | if (!session->active) { | |
459 | ret = -EBUSY; | |
460 | goto end; | |
461 | } | |
462 | ||
463 | mutex_lock(&cache->lock); | |
464 | memset(cache->data, 0, cache->cache_alloc); | |
465 | cache->metadata_written = 0; | |
466 | cache->version++; | |
467 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
468 | stream->metadata_out = 0; | |
469 | stream->metadata_in = 0; | |
470 | } | |
471 | mutex_unlock(&cache->lock); | |
472 | ||
473 | session->metadata_dumped = 0; | |
474 | list_for_each_entry(chan, &session->chan, list) { | |
475 | chan->metadata_dumped = 0; | |
476 | } | |
477 | ||
478 | list_for_each_entry(event, &session->events, list) { | |
479 | event->metadata_dumped = 0; | |
480 | } | |
481 | ||
482 | ret = _lttng_session_metadata_statedump(session); | |
483 | ||
484 | end: | |
485 | mutex_unlock(&sessions_mutex); | |
486 | return ret; | |
487 | } | |
488 | ||
a90917c3 | 489 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 490 | { |
3c997079 | 491 | int ret = 0; |
e64957da | 492 | |
3c997079 MD |
493 | mutex_lock(&sessions_mutex); |
494 | if (channel->channel_type == METADATA_CHANNEL) { | |
495 | ret = -EPERM; | |
496 | goto end; | |
497 | } | |
498 | if (channel->enabled) { | |
499 | ret = -EEXIST; | |
500 | goto end; | |
501 | } | |
502 | /* Set transient enabler state to "enabled" */ | |
503 | channel->tstate = 1; | |
b2bc0bc8 | 504 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 505 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 506 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
507 | end: |
508 | mutex_unlock(&sessions_mutex); | |
509 | return ret; | |
e64957da MD |
510 | } |
511 | ||
a90917c3 | 512 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 513 | { |
3c997079 | 514 | int ret = 0; |
e64957da | 515 | |
3c997079 MD |
516 | mutex_lock(&sessions_mutex); |
517 | if (channel->channel_type == METADATA_CHANNEL) { | |
518 | ret = -EPERM; | |
519 | goto end; | |
520 | } | |
521 | if (!channel->enabled) { | |
522 | ret = -EEXIST; | |
523 | goto end; | |
524 | } | |
525 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 526 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
527 | /* Set transient enabler state to "enabled" */ |
528 | channel->tstate = 0; | |
b2bc0bc8 | 529 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
530 | end: |
531 | mutex_unlock(&sessions_mutex); | |
532 | return ret; | |
e64957da MD |
533 | } |
534 | ||
a90917c3 | 535 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 536 | { |
3c997079 | 537 | int ret = 0; |
e64957da | 538 | |
3c997079 MD |
539 | mutex_lock(&sessions_mutex); |
540 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
541 | ret = -EPERM; | |
542 | goto end; | |
543 | } | |
544 | if (event->enabled) { | |
545 | ret = -EEXIST; | |
546 | goto end; | |
547 | } | |
a0493bef MD |
548 | switch (event->instrumentation) { |
549 | case LTTNG_KERNEL_TRACEPOINT: | |
550 | case LTTNG_KERNEL_SYSCALL: | |
551 | ret = -EINVAL; | |
552 | break; | |
553 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 554 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 555 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 556 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
557 | break; |
558 | case LTTNG_KERNEL_KRETPROBE: | |
559 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
560 | break; | |
e884017c | 561 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
562 | default: |
563 | WARN_ON_ONCE(1); | |
564 | ret = -EINVAL; | |
565 | } | |
3c997079 MD |
566 | end: |
567 | mutex_unlock(&sessions_mutex); | |
568 | return ret; | |
e64957da MD |
569 | } |
570 | ||
a90917c3 | 571 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 572 | { |
3c997079 | 573 | int ret = 0; |
e64957da | 574 | |
3c997079 MD |
575 | mutex_lock(&sessions_mutex); |
576 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
577 | ret = -EPERM; | |
578 | goto end; | |
579 | } | |
580 | if (!event->enabled) { | |
581 | ret = -EEXIST; | |
582 | goto end; | |
583 | } | |
a0493bef MD |
584 | switch (event->instrumentation) { |
585 | case LTTNG_KERNEL_TRACEPOINT: | |
586 | case LTTNG_KERNEL_SYSCALL: | |
587 | ret = -EINVAL; | |
588 | break; | |
589 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 590 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 591 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 592 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
593 | break; |
594 | case LTTNG_KERNEL_KRETPROBE: | |
595 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
596 | break; | |
e884017c | 597 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
598 | default: |
599 | WARN_ON_ONCE(1); | |
600 | ret = -EINVAL; | |
601 | } | |
3c997079 MD |
602 | end: |
603 | mutex_unlock(&sessions_mutex); | |
604 | return ret; | |
e64957da MD |
605 | } |
606 | ||
dffef45d FD |
607 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
608 | { | |
609 | int ret = 0; | |
610 | ||
611 | mutex_lock(&sessions_mutex); | |
612 | if (event_notifier->enabled) { | |
613 | ret = -EEXIST; | |
614 | goto end; | |
615 | } | |
616 | switch (event_notifier->instrumentation) { | |
617 | case LTTNG_KERNEL_TRACEPOINT: | |
8ced8896 | 618 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
619 | ret = -EINVAL; |
620 | break; | |
dffef45d | 621 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 622 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
623 | WRITE_ONCE(event_notifier->enabled, 1); |
624 | break; | |
dffef45d | 625 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
626 | case LTTNG_KERNEL_NOOP: |
627 | case LTTNG_KERNEL_KRETPROBE: | |
628 | default: | |
629 | WARN_ON_ONCE(1); | |
630 | ret = -EINVAL; | |
631 | } | |
632 | end: | |
633 | mutex_unlock(&sessions_mutex); | |
634 | return ret; | |
635 | } | |
636 | ||
637 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
638 | { | |
639 | int ret = 0; | |
640 | ||
641 | mutex_lock(&sessions_mutex); | |
642 | if (!event_notifier->enabled) { | |
643 | ret = -EEXIST; | |
644 | goto end; | |
645 | } | |
646 | switch (event_notifier->instrumentation) { | |
647 | case LTTNG_KERNEL_TRACEPOINT: | |
8ced8896 | 648 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
649 | ret = -EINVAL; |
650 | break; | |
dffef45d | 651 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 652 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
653 | WRITE_ONCE(event_notifier->enabled, 0); |
654 | break; | |
dffef45d | 655 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
656 | case LTTNG_KERNEL_NOOP: |
657 | case LTTNG_KERNEL_KRETPROBE: | |
658 | default: | |
659 | WARN_ON_ONCE(1); | |
660 | ret = -EINVAL; | |
661 | } | |
662 | end: | |
663 | mutex_unlock(&sessions_mutex); | |
664 | return ret; | |
665 | } | |
666 | ||
a90917c3 | 667 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
668 | const char *transport_name, |
669 | void *buf_addr, | |
4e3c1b9b MD |
670 | size_t subbuf_size, size_t num_subbuf, |
671 | unsigned int switch_timer_interval, | |
d83004aa JD |
672 | unsigned int read_timer_interval, |
673 | enum channel_type channel_type) | |
4e3c1b9b | 674 | { |
a90917c3 MD |
675 | struct lttng_channel *chan; |
676 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
677 | |
678 | mutex_lock(&sessions_mutex); | |
d83004aa | 679 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 680 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 681 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 682 | if (!transport) { |
5a15f70c | 683 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 684 | transport_name); |
c0e31d2e | 685 | goto notransport; |
f3d01b96 | 686 | } |
a33c9927 | 687 | if (!try_module_get(transport->owner)) { |
5a15f70c | 688 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
689 | goto notransport; |
690 | } | |
a90917c3 | 691 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 692 | if (!chan) |
c0e31d2e | 693 | goto nomem; |
4e3c1b9b | 694 | chan->session = session; |
05d32c64 | 695 | chan->id = session->free_chan_id++; |
3b731ab1 | 696 | chan->ops = &transport->ops; |
125b4df4 MD |
697 | /* |
698 | * Note: the channel creation op already writes into the packet | |
699 | * headers. Therefore the "chan" information used as input | |
700 | * should be already accessible. | |
701 | */ | |
5f5ddf01 MD |
702 | chan->chan = transport->ops.channel_create(transport_name, |
703 | chan, buf_addr, subbuf_size, num_subbuf, | |
704 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
705 | if (!chan->chan) |
706 | goto create_error; | |
3c997079 | 707 | chan->tstate = 1; |
e64957da | 708 | chan->enabled = 1; |
a33c9927 | 709 | chan->transport = transport; |
d83004aa | 710 | chan->channel_type = channel_type; |
4e3c1b9b MD |
711 | list_add(&chan->list, &session->chan); |
712 | mutex_unlock(&sessions_mutex); | |
713 | return chan; | |
714 | ||
f3d01b96 MD |
715 | create_error: |
716 | kfree(chan); | |
c0e31d2e | 717 | nomem: |
a33c9927 MD |
718 | if (transport) |
719 | module_put(transport->owner); | |
c0e31d2e | 720 | notransport: |
e5382b6d | 721 | active: |
4e3c1b9b MD |
722 | mutex_unlock(&sessions_mutex); |
723 | return NULL; | |
724 | } | |
725 | ||
726 | /* | |
d83004aa JD |
727 | * Only used internally at session destruction for per-cpu channels, and |
728 | * when metadata channel is released. | |
729 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 730 | */ |
aa7c23a9 | 731 | static |
a90917c3 | 732 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 733 | { |
11b5a3c2 | 734 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 735 | module_put(chan->transport->owner); |
4e3c1b9b | 736 | list_del(&chan->list); |
8070f5c0 | 737 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
738 | kfree(chan); |
739 | } | |
740 | ||
d83004aa JD |
741 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
742 | { | |
743 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
744 | ||
745 | /* Protect the metadata cache with the sessions_mutex. */ | |
746 | mutex_lock(&sessions_mutex); | |
747 | _lttng_channel_destroy(chan); | |
748 | mutex_unlock(&sessions_mutex); | |
749 | } | |
750 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
751 | ||
752 | static | |
753 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
754 | { | |
755 | stream->finalized = 1; | |
756 | wake_up_interruptible(&stream->read_wait); | |
757 | } | |
758 | ||
e5382b6d MD |
759 | /* |
760 | * Supports event creation while tracing session is active. | |
3c997079 | 761 | * Needs to be called with sessions mutex held. |
e5382b6d | 762 | */ |
3c997079 MD |
763 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
764 | struct lttng_kernel_event *event_param, | |
765 | void *filter, | |
766 | const struct lttng_event_desc *event_desc, | |
767 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 768 | { |
3c997079 | 769 | struct lttng_session *session = chan->session; |
a90917c3 | 770 | struct lttng_event *event; |
3c997079 MD |
771 | const char *event_name; |
772 | struct hlist_head *head; | |
3d084699 | 773 | int ret; |
4e3c1b9b | 774 | |
abc0446a | 775 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 776 | ret = -EMFILE; |
e5382b6d | 777 | goto full; |
abc0446a | 778 | } |
3c997079 MD |
779 | |
780 | switch (itype) { | |
781 | case LTTNG_KERNEL_TRACEPOINT: | |
782 | event_name = event_desc->name; | |
783 | break; | |
784 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 785 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 786 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 787 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 788 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
789 | event_name = event_param->name; |
790 | break; | |
e884017c | 791 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
792 | default: |
793 | WARN_ON_ONCE(1); | |
794 | ret = -EINVAL; | |
795 | goto type_error; | |
796 | } | |
4a11ef1c FD |
797 | |
798 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
799 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 800 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
801 | WARN_ON_ONCE(!event->desc); |
802 | if (!strncmp(event->desc->name, event_name, | |
803 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
804 | && chan == event->chan) { | |
805 | ret = -EEXIST; | |
806 | goto exist; | |
abc0446a MD |
807 | } |
808 | } | |
3c997079 | 809 | |
11b5a3c2 | 810 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 811 | if (!event) { |
4cf0bf51 | 812 | ret = -ENOMEM; |
4e3c1b9b | 813 | goto cache_error; |
abc0446a | 814 | } |
4e3c1b9b MD |
815 | event->chan = chan; |
816 | event->filter = filter; | |
e5382b6d | 817 | event->id = chan->free_event_id++; |
3c997079 MD |
818 | event->instrumentation = itype; |
819 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 820 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
821 | INIT_LIST_HEAD(&event->enablers_ref_head); |
822 | ||
823 | switch (itype) { | |
ab2277d6 | 824 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
825 | /* Event will be enabled by enabler sync. */ |
826 | event->enabled = 0; | |
827 | event->registered = 0; | |
0bcedee9 | 828 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 829 | if (!event->desc) { |
4cf0bf51 | 830 | ret = -ENOENT; |
d3dbe23c | 831 | goto register_error; |
abc0446a | 832 | } |
3c997079 MD |
833 | /* Populate lttng_event structure before event registration. */ |
834 | smp_wmb(); | |
baf20995 | 835 | break; |
ab2277d6 | 836 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
837 | /* |
838 | * Needs to be explicitly enabled after creation, since | |
839 | * we may want to apply filters. | |
840 | */ | |
841 | event->enabled = 0; | |
3c997079 MD |
842 | event->registered = 1; |
843 | /* | |
844 | * Populate lttng_event structure before event | |
845 | * registration. | |
846 | */ | |
847 | smp_wmb(); | |
8bf17deb | 848 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
849 | event_param->u.kprobe.symbol_name, |
850 | event_param->u.kprobe.offset, | |
851 | event_param->u.kprobe.addr, | |
852 | event); | |
abc0446a | 853 | if (ret) { |
4cf0bf51 | 854 | ret = -EINVAL; |
d6d808f3 | 855 | goto register_error; |
abc0446a | 856 | } |
edeb3137 MD |
857 | ret = try_module_get(event->desc->owner); |
858 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 859 | break; |
7371f44c MD |
860 | case LTTNG_KERNEL_KRETPROBE: |
861 | { | |
a90917c3 | 862 | struct lttng_event *event_return; |
7371f44c MD |
863 | |
864 | /* kretprobe defines 2 events */ | |
a0493bef MD |
865 | /* |
866 | * Needs to be explicitly enabled after creation, since | |
867 | * we may want to apply filters. | |
868 | */ | |
869 | event->enabled = 0; | |
3c997079 | 870 | event->registered = 1; |
7371f44c MD |
871 | event_return = |
872 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 873 | if (!event_return) { |
4cf0bf51 | 874 | ret = -ENOMEM; |
7371f44c | 875 | goto register_error; |
abc0446a | 876 | } |
7371f44c MD |
877 | event_return->chan = chan; |
878 | event_return->filter = filter; | |
879 | event_return->id = chan->free_event_id++; | |
a0493bef | 880 | event_return->enabled = 0; |
3c997079 MD |
881 | event_return->registered = 1; |
882 | event_return->instrumentation = itype; | |
7371f44c | 883 | /* |
a90917c3 | 884 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
885 | */ |
886 | smp_wmb(); | |
3c997079 | 887 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
888 | event_param->u.kretprobe.symbol_name, |
889 | event_param->u.kretprobe.offset, | |
890 | event_param->u.kretprobe.addr, | |
891 | event, event_return); | |
892 | if (ret) { | |
893 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 894 | ret = -EINVAL; |
7371f44c MD |
895 | goto register_error; |
896 | } | |
897 | /* Take 2 refs on the module: one per event. */ | |
898 | ret = try_module_get(event->desc->owner); | |
899 | WARN_ON_ONCE(!ret); | |
900 | ret = try_module_get(event->desc->owner); | |
901 | WARN_ON_ONCE(!ret); | |
a90917c3 | 902 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 903 | event_return); |
abc0446a | 904 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
905 | if (ret) { |
906 | kmem_cache_free(event_cache, event_return); | |
907 | module_put(event->desc->owner); | |
908 | module_put(event->desc->owner); | |
909 | goto statedump_error; | |
910 | } | |
911 | list_add(&event_return->list, &chan->session->events); | |
912 | break; | |
913 | } | |
1ec65de1 | 914 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 915 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
916 | /* |
917 | * Needs to be explicitly enabled after creation, since | |
918 | * we may want to apply filters. | |
919 | */ | |
920 | event->enabled = 0; | |
3c997079 MD |
921 | event->registered = 0; |
922 | event->desc = event_desc; | |
badfe9f5 MD |
923 | switch (event_param->u.syscall.entryexit) { |
924 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
925 | ret = -EINVAL; | |
926 | goto register_error; | |
927 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
928 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
929 | break; | |
930 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
931 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
932 | break; | |
933 | } | |
934 | switch (event_param->u.syscall.abi) { | |
935 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
936 | ret = -EINVAL; | |
937 | goto register_error; | |
938 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
939 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
940 | break; | |
941 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
942 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
943 | break; | |
944 | } | |
abc0446a | 945 | if (!event->desc) { |
4cf0bf51 | 946 | ret = -EINVAL; |
259b6cb3 | 947 | goto register_error; |
abc0446a | 948 | } |
1ec65de1 | 949 | break; |
149b9a9d | 950 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
951 | /* |
952 | * Needs to be explicitly enabled after creation, since | |
953 | * we may want to apply filters. | |
954 | */ | |
955 | event->enabled = 0; | |
956 | event->registered = 1; | |
3aed4dca | 957 | |
a344f64b FD |
958 | /* |
959 | * Populate lttng_event structure before event | |
960 | * registration. | |
961 | */ | |
962 | smp_wmb(); | |
149b9a9d | 963 | |
83b802dc | 964 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 965 | event_param->u.uprobe.fd, |
149b9a9d YB |
966 | event); |
967 | if (ret) | |
968 | goto register_error; | |
969 | ret = try_module_get(event->desc->owner); | |
970 | WARN_ON_ONCE(!ret); | |
971 | break; | |
e884017c | 972 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
973 | default: |
974 | WARN_ON_ONCE(1); | |
4cf0bf51 | 975 | ret = -EINVAL; |
df07930b | 976 | goto register_error; |
baf20995 | 977 | } |
a90917c3 | 978 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
979 | WARN_ON_ONCE(ret > 0); |
980 | if (ret) { | |
c099397a | 981 | goto statedump_error; |
abc0446a | 982 | } |
3c997079 | 983 | hlist_add_head(&event->hlist, head); |
dda6a249 | 984 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
985 | return event; |
986 | ||
c099397a | 987 | statedump_error: |
259b6cb3 | 988 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 989 | register_error: |
11b5a3c2 | 990 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
991 | cache_error: |
992 | exist: | |
3c997079 | 993 | type_error: |
e5382b6d | 994 | full: |
4cf0bf51 | 995 | return ERR_PTR(ret); |
4e3c1b9b MD |
996 | } |
997 | ||
dffef45d FD |
998 | struct lttng_event_notifier *_lttng_event_notifier_create( |
999 | const struct lttng_event_desc *event_desc, | |
1000 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
1001 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1002 | void *filter, enum lttng_kernel_instrumentation itype) | |
1003 | { | |
1004 | struct lttng_event_notifier *event_notifier; | |
1005 | const char *event_name; | |
1006 | struct hlist_head *head; | |
1007 | int ret; | |
1008 | ||
1009 | switch (itype) { | |
1010 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1011 | event_name = event_desc->name; |
1012 | break; | |
dffef45d | 1013 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1014 | case LTTNG_KERNEL_UPROBE: |
8ced8896 | 1015 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1016 | event_name = event_notifier_param->event.name; |
1017 | break; | |
dffef45d FD |
1018 | case LTTNG_KERNEL_KRETPROBE: |
1019 | case LTTNG_KERNEL_FUNCTION: | |
1020 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1021 | default: |
1022 | WARN_ON_ONCE(1); | |
1023 | ret = -EINVAL; | |
1024 | goto type_error; | |
1025 | } | |
1026 | ||
1027 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1028 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1029 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1030 | WARN_ON_ONCE(!event_notifier->desc); | |
1031 | if (!strncmp(event_notifier->desc->name, event_name, | |
1032 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1033 | && event_notifier_group == event_notifier->group | |
1034 | && token == event_notifier->user_token) { | |
1035 | ret = -EEXIST; | |
1036 | goto exist; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1041 | if (!event_notifier) { | |
1042 | ret = -ENOMEM; | |
1043 | goto cache_error; | |
1044 | } | |
21f58fb7 | 1045 | |
dffef45d FD |
1046 | event_notifier->group = event_notifier_group; |
1047 | event_notifier->user_token = token; | |
1048 | event_notifier->filter = filter; | |
1049 | event_notifier->instrumentation = itype; | |
1050 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1051 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
dffef45d FD |
1052 | INIT_LIST_HEAD(&event_notifier->bytecode_runtime_head); |
1053 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
1054 | ||
1055 | switch (itype) { | |
1056 | case LTTNG_KERNEL_TRACEPOINT: | |
1057 | /* Event will be enabled by enabler sync. */ | |
1058 | event_notifier->enabled = 0; | |
1059 | event_notifier->registered = 0; | |
1060 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1061 | if (!event_notifier->desc) { | |
1062 | ret = -ENOENT; | |
1063 | goto register_error; | |
1064 | } | |
1065 | /* Populate lttng_event_notifier structure before event registration. */ | |
1066 | smp_wmb(); | |
1067 | break; | |
1068 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1069 | /* |
1070 | * Needs to be explicitly enabled after creation, since | |
1071 | * we may want to apply filters. | |
1072 | */ | |
1073 | event_notifier->enabled = 0; | |
1074 | event_notifier->registered = 1; | |
1075 | /* | |
1076 | * Populate lttng_event_notifier structure before event | |
1077 | * registration. | |
1078 | */ | |
1079 | smp_wmb(); | |
1080 | ret = lttng_kprobes_register_event_notifier( | |
1081 | event_notifier_param->event.u.kprobe.symbol_name, | |
1082 | event_notifier_param->event.u.kprobe.offset, | |
1083 | event_notifier_param->event.u.kprobe.addr, | |
1084 | event_notifier); | |
1085 | if (ret) { | |
1086 | ret = -EINVAL; | |
1087 | goto register_error; | |
1088 | } | |
1089 | ret = try_module_get(event_notifier->desc->owner); | |
1090 | WARN_ON_ONCE(!ret); | |
1091 | break; | |
8ced8896 FD |
1092 | case LTTNG_KERNEL_NOOP: |
1093 | case LTTNG_KERNEL_SYSCALL: | |
1094 | /* | |
1095 | * Needs to be explicitly enabled after creation, since | |
1096 | * we may want to apply filters. | |
1097 | */ | |
1098 | event_notifier->enabled = 0; | |
1099 | event_notifier->registered = 0; | |
1100 | event_notifier->desc = event_desc; | |
1101 | if (!event_notifier->desc) { | |
1102 | ret = -EINVAL; | |
1103 | goto register_error; | |
1104 | } | |
1105 | break; | |
dffef45d | 1106 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1107 | /* |
1108 | * Needs to be explicitly enabled after creation, since | |
1109 | * we may want to apply filters. | |
1110 | */ | |
1111 | event_notifier->enabled = 0; | |
1112 | event_notifier->registered = 1; | |
1113 | ||
1114 | /* | |
1115 | * Populate lttng_event_notifier structure before | |
1116 | * event_notifier registration. | |
1117 | */ | |
1118 | smp_wmb(); | |
1119 | ||
1120 | ret = lttng_uprobes_register_event_notifier( | |
1121 | event_notifier_param->event.name, | |
1122 | event_notifier_param->event.u.uprobe.fd, | |
1123 | event_notifier); | |
1124 | if (ret) | |
1125 | goto register_error; | |
1126 | ret = try_module_get(event_notifier->desc->owner); | |
1127 | WARN_ON_ONCE(!ret); | |
1128 | break; | |
dffef45d FD |
1129 | case LTTNG_KERNEL_KRETPROBE: |
1130 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1131 | default: |
1132 | WARN_ON_ONCE(1); | |
1133 | ret = -EINVAL; | |
1134 | goto register_error; | |
1135 | } | |
1136 | ||
1137 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1138 | hlist_add_head(&event_notifier->hlist, head); | |
1139 | return event_notifier; | |
1140 | ||
1141 | register_error: | |
1142 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1143 | cache_error: | |
1144 | exist: | |
1145 | type_error: | |
1146 | return ERR_PTR(ret); | |
1147 | } | |
1148 | ||
3c997079 MD |
1149 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1150 | struct lttng_kernel_event *event_param, | |
1151 | void *filter, | |
1152 | const struct lttng_event_desc *event_desc, | |
1153 | enum lttng_kernel_instrumentation itype) | |
1154 | { | |
1155 | struct lttng_event *event; | |
1156 | ||
1157 | mutex_lock(&sessions_mutex); | |
1158 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1159 | itype); | |
1160 | mutex_unlock(&sessions_mutex); | |
1161 | return event; | |
1162 | } | |
1163 | ||
dffef45d FD |
1164 | struct lttng_event_notifier *lttng_event_notifier_create( |
1165 | const struct lttng_event_desc *event_desc, | |
1166 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1167 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1168 | void *filter, enum lttng_kernel_instrumentation itype) | |
1169 | { | |
1170 | struct lttng_event_notifier *event_notifier; | |
1171 | ||
1172 | mutex_lock(&sessions_mutex); | |
1173 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1174 | event_notifier_group, event_notifier_param, filter, itype); | |
1175 | mutex_unlock(&sessions_mutex); | |
1176 | return event_notifier; | |
1177 | } | |
1178 | ||
3c997079 MD |
1179 | /* Only used for tracepoints for now. */ |
1180 | static | |
1181 | void register_event(struct lttng_event *event) | |
1182 | { | |
1183 | const struct lttng_event_desc *desc; | |
f127e61e | 1184 | int ret = -EINVAL; |
3c997079 | 1185 | |
3c997079 MD |
1186 | if (event->registered) |
1187 | return; | |
4ecb5ad5 | 1188 | |
3c997079 | 1189 | desc = event->desc; |
4ecb5ad5 MD |
1190 | switch (event->instrumentation) { |
1191 | case LTTNG_KERNEL_TRACEPOINT: | |
1192 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1193 | desc->probe_callback, | |
1194 | event); | |
1195 | break; | |
1196 | case LTTNG_KERNEL_SYSCALL: | |
2d6d88c6 | 1197 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1198 | break; |
1199 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1200 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1201 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1202 | case LTTNG_KERNEL_NOOP: |
1203 | ret = 0; | |
1204 | break; | |
e884017c | 1205 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1206 | default: |
1207 | WARN_ON_ONCE(1); | |
1208 | } | |
3c997079 MD |
1209 | if (!ret) |
1210 | event->registered = 1; | |
1211 | } | |
1212 | ||
4e3c1b9b MD |
1213 | /* |
1214 | * Only used internally at session destruction. | |
1215 | */ | |
a90917c3 | 1216 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1217 | { |
4ecb5ad5 | 1218 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1219 | int ret = -EINVAL; |
1220 | ||
3c997079 MD |
1221 | if (!event->registered) |
1222 | return 0; | |
1223 | ||
4ecb5ad5 | 1224 | desc = event->desc; |
38d024ae | 1225 | switch (event->instrumentation) { |
ab2277d6 | 1226 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1227 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1228 | event->desc->probe_callback, |
11b5a3c2 | 1229 | event); |
baf20995 | 1230 | break; |
ab2277d6 | 1231 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1232 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1233 | ret = 0; |
1234 | break; | |
7371f44c MD |
1235 | case LTTNG_KERNEL_KRETPROBE: |
1236 | lttng_kretprobes_unregister(event); | |
1237 | ret = 0; | |
1238 | break; | |
33a39a3c | 1239 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1240 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1241 | break; |
1242 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1243 | ret = 0; |
1244 | break; | |
149b9a9d | 1245 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1246 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1247 | ret = 0; |
1248 | break; | |
e884017c | 1249 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1250 | default: |
1251 | WARN_ON_ONCE(1); | |
1252 | } | |
3c997079 MD |
1253 | if (!ret) |
1254 | event->registered = 0; | |
dda6a249 MD |
1255 | return ret; |
1256 | } | |
1257 | ||
dffef45d FD |
1258 | /* Only used for tracepoints for now. */ |
1259 | static | |
b01155ba | 1260 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1261 | { |
1262 | const struct lttng_event_desc *desc; | |
1263 | int ret = -EINVAL; | |
1264 | ||
1265 | if (event_notifier->registered) | |
1266 | return; | |
1267 | ||
1268 | desc = event_notifier->desc; | |
1269 | switch (event_notifier->instrumentation) { | |
1270 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1271 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1272 | desc->event_notifier_callback, | |
1273 | event_notifier); | |
1274 | break; | |
8ced8896 FD |
1275 | case LTTNG_KERNEL_SYSCALL: |
1276 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1277 | break; | |
dffef45d | 1278 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1279 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1280 | ret = 0; |
1281 | break; | |
dffef45d FD |
1282 | case LTTNG_KERNEL_KRETPROBE: |
1283 | case LTTNG_KERNEL_FUNCTION: | |
1284 | case LTTNG_KERNEL_NOOP: | |
1285 | default: | |
1286 | WARN_ON_ONCE(1); | |
1287 | } | |
1288 | if (!ret) | |
1289 | event_notifier->registered = 1; | |
1290 | } | |
1291 | ||
1292 | static | |
1293 | int _lttng_event_notifier_unregister( | |
1294 | struct lttng_event_notifier *event_notifier) | |
1295 | { | |
1296 | const struct lttng_event_desc *desc; | |
1297 | int ret = -EINVAL; | |
1298 | ||
1299 | if (!event_notifier->registered) | |
1300 | return 0; | |
1301 | ||
1302 | desc = event_notifier->desc; | |
1303 | switch (event_notifier->instrumentation) { | |
1304 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1305 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1306 | event_notifier->desc->event_notifier_callback, | |
1307 | event_notifier); | |
1308 | break; | |
dffef45d | 1309 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1310 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1311 | ret = 0; | |
1312 | break; | |
9de67196 FD |
1313 | case LTTNG_KERNEL_UPROBE: |
1314 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1315 | ret = 0; | |
1316 | break; | |
8ced8896 FD |
1317 | case LTTNG_KERNEL_SYSCALL: |
1318 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1319 | break; | |
dffef45d FD |
1320 | case LTTNG_KERNEL_KRETPROBE: |
1321 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1322 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1323 | default: |
1324 | WARN_ON_ONCE(1); | |
1325 | } | |
1326 | if (!ret) | |
1327 | event_notifier->registered = 0; | |
1328 | return ret; | |
1329 | } | |
1330 | ||
dda6a249 MD |
1331 | /* |
1332 | * Only used internally at session destruction. | |
1333 | */ | |
be066e6c | 1334 | static |
a90917c3 | 1335 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1336 | { |
edeb3137 MD |
1337 | switch (event->instrumentation) { |
1338 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1339 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1340 | break; |
1341 | case LTTNG_KERNEL_KPROBE: | |
1342 | module_put(event->desc->owner); | |
8bf17deb | 1343 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1344 | break; |
7371f44c MD |
1345 | case LTTNG_KERNEL_KRETPROBE: |
1346 | module_put(event->desc->owner); | |
1347 | lttng_kretprobes_destroy_private(event); | |
1348 | break; | |
259b6cb3 | 1349 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1350 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1351 | break; |
149b9a9d YB |
1352 | case LTTNG_KERNEL_UPROBE: |
1353 | module_put(event->desc->owner); | |
83b802dc | 1354 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1355 | break; |
e884017c | 1356 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1357 | default: |
1358 | WARN_ON_ONCE(1); | |
1359 | } | |
dda6a249 | 1360 | list_del(&event->list); |
8070f5c0 | 1361 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1362 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1363 | } |
1364 | ||
dffef45d FD |
1365 | /* |
1366 | * Only used internally at session destruction. | |
1367 | */ | |
1368 | static | |
1369 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1370 | { | |
1371 | switch (event_notifier->instrumentation) { | |
1372 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1373 | lttng_event_desc_put(event_notifier->desc); |
1374 | break; | |
dffef45d | 1375 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1376 | module_put(event_notifier->desc->owner); |
1377 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1378 | break; | |
8ced8896 FD |
1379 | case LTTNG_KERNEL_NOOP: |
1380 | case LTTNG_KERNEL_SYSCALL: | |
1381 | break; | |
9de67196 FD |
1382 | case LTTNG_KERNEL_UPROBE: |
1383 | module_put(event_notifier->desc->owner); | |
1384 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1385 | break; | |
dffef45d FD |
1386 | case LTTNG_KERNEL_KRETPROBE: |
1387 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1388 | default: |
1389 | WARN_ON_ONCE(1); | |
1390 | } | |
1391 | list_del(&event_notifier->list); | |
1392 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1393 | } | |
1394 | ||
d1f652f8 MD |
1395 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1396 | enum tracker_type tracker_type) | |
e0130fab | 1397 | { |
d1f652f8 MD |
1398 | switch (tracker_type) { |
1399 | case TRACKER_PID: | |
1400 | return &session->pid_tracker; | |
1401 | case TRACKER_VPID: | |
1402 | return &session->vpid_tracker; | |
1403 | case TRACKER_UID: | |
1404 | return &session->uid_tracker; | |
1405 | case TRACKER_VUID: | |
1406 | return &session->vuid_tracker; | |
1407 | case TRACKER_GID: | |
1408 | return &session->gid_tracker; | |
1409 | case TRACKER_VGID: | |
1410 | return &session->vgid_tracker; | |
1411 | default: | |
1412 | WARN_ON_ONCE(1); | |
1413 | return NULL; | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | int lttng_session_track_id(struct lttng_session *session, | |
1418 | enum tracker_type tracker_type, int id) | |
1419 | { | |
1420 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1421 | int ret; |
1422 | ||
d1f652f8 MD |
1423 | tracker = get_tracker(session, tracker_type); |
1424 | if (!tracker) | |
1425 | return -EINVAL; | |
1426 | if (id < -1) | |
e0130fab MD |
1427 | return -EINVAL; |
1428 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1429 | if (id == -1) { |
1430 | /* track all ids: destroy tracker. */ | |
1431 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1432 | ret = 0; |
1433 | } else { | |
d1f652f8 | 1434 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1435 | } |
e0130fab MD |
1436 | mutex_unlock(&sessions_mutex); |
1437 | return ret; | |
1438 | } | |
1439 | ||
d1f652f8 MD |
1440 | int lttng_session_untrack_id(struct lttng_session *session, |
1441 | enum tracker_type tracker_type, int id) | |
e0130fab | 1442 | { |
d1f652f8 | 1443 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1444 | int ret; |
1445 | ||
d1f652f8 MD |
1446 | tracker = get_tracker(session, tracker_type); |
1447 | if (!tracker) | |
1448 | return -EINVAL; | |
1449 | if (id < -1) | |
e0130fab MD |
1450 | return -EINVAL; |
1451 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1452 | if (id == -1) { |
1453 | /* untrack all ids: replace by empty tracker. */ | |
1454 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1455 | } else { |
d1f652f8 | 1456 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1457 | } |
e0130fab MD |
1458 | mutex_unlock(&sessions_mutex); |
1459 | return ret; | |
1460 | } | |
1461 | ||
7e6f9ef6 | 1462 | static |
d1f652f8 | 1463 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1464 | { |
d1f652f8 MD |
1465 | struct lttng_id_tracker *id_tracker = m->private; |
1466 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1467 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1468 | int iter = 0, i; |
1469 | ||
1470 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1471 | if (id_tracker_p) { |
1472 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1473 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1474 | |
f934e302 | 1475 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1476 | if (iter++ >= *pos) |
1477 | return e; | |
1478 | } | |
1479 | } | |
1480 | } else { | |
d1f652f8 | 1481 | /* ID tracker disabled. */ |
7e6f9ef6 | 1482 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1483 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1484 | } |
1485 | iter++; | |
1486 | } | |
1487 | /* End of list */ | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
1491 | /* Called with sessions_mutex held. */ | |
1492 | static | |
d1f652f8 | 1493 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1494 | { |
d1f652f8 MD |
1495 | struct lttng_id_tracker *id_tracker = m->private; |
1496 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1497 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1498 | int iter = 0, i; |
1499 | ||
1500 | (*ppos)++; | |
d1f652f8 MD |
1501 | if (id_tracker_p) { |
1502 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1503 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1504 | |
f934e302 | 1505 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1506 | if (iter++ >= *ppos) |
1507 | return e; | |
1508 | } | |
1509 | } | |
1510 | } else { | |
d1f652f8 | 1511 | /* ID tracker disabled. */ |
7e6f9ef6 | 1512 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1513 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1514 | iter++; |
1515 | } | |
1516 | ||
1517 | /* End of list */ | |
1518 | return NULL; | |
1519 | } | |
1520 | ||
1521 | static | |
d1f652f8 | 1522 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1523 | { |
1524 | mutex_unlock(&sessions_mutex); | |
1525 | } | |
1526 | ||
1527 | static | |
d1f652f8 | 1528 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1529 | { |
d1f652f8 MD |
1530 | struct lttng_id_tracker *id_tracker = m->private; |
1531 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1532 | int id; | |
7e6f9ef6 | 1533 | |
d1f652f8 | 1534 | if (p == id_tracker_p) { |
7e6f9ef6 | 1535 | /* Tracker disabled. */ |
d1f652f8 | 1536 | id = -1; |
7e6f9ef6 | 1537 | } else { |
d1f652f8 | 1538 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1539 | |
d1f652f8 MD |
1540 | id = lttng_id_tracker_get_node_id(e); |
1541 | } | |
1542 | switch (id_tracker->tracker_type) { | |
1543 | case TRACKER_PID: | |
1544 | seq_printf(m, "process { pid = %d; };\n", id); | |
1545 | break; | |
1546 | case TRACKER_VPID: | |
1547 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1548 | break; | |
1549 | case TRACKER_UID: | |
1550 | seq_printf(m, "user { uid = %d; };\n", id); | |
1551 | break; | |
1552 | case TRACKER_VUID: | |
1553 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1554 | break; | |
1555 | case TRACKER_GID: | |
1556 | seq_printf(m, "group { gid = %d; };\n", id); | |
1557 | break; | |
1558 | case TRACKER_VGID: | |
1559 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1560 | break; | |
1561 | default: | |
1562 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1563 | } |
7e6f9ef6 MD |
1564 | return 0; |
1565 | } | |
1566 | ||
1567 | static | |
d1f652f8 MD |
1568 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1569 | .start = id_list_start, | |
1570 | .next = id_list_next, | |
1571 | .stop = id_list_stop, | |
1572 | .show = id_list_show, | |
7e6f9ef6 MD |
1573 | }; |
1574 | ||
1575 | static | |
d1f652f8 | 1576 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1577 | { |
d1f652f8 | 1578 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1579 | } |
1580 | ||
1581 | static | |
d1f652f8 | 1582 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1583 | { |
1584 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1585 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1586 | int ret; |
1587 | ||
d1f652f8 | 1588 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1589 | ret = seq_release(inode, file); |
d1f652f8 MD |
1590 | if (!ret) |
1591 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1592 | return ret; |
1593 | } | |
1594 | ||
d1f652f8 | 1595 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1596 | .owner = THIS_MODULE, |
d1f652f8 | 1597 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1598 | .read = seq_read, |
1599 | .llseek = seq_lseek, | |
d1f652f8 | 1600 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1601 | }; |
1602 | ||
d1f652f8 MD |
1603 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1604 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1605 | { |
d1f652f8 | 1606 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1607 | struct seq_file *m; |
1608 | int file_fd, ret; | |
1609 | ||
1610 | file_fd = lttng_get_unused_fd(); | |
1611 | if (file_fd < 0) { | |
1612 | ret = file_fd; | |
1613 | goto fd_error; | |
1614 | } | |
1615 | ||
d1f652f8 MD |
1616 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1617 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1618 | NULL, O_RDWR); |
d1f652f8 MD |
1619 | if (IS_ERR(tracker_ids_list_file)) { |
1620 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1621 | goto file_error; |
1622 | } | |
98d7281c MJ |
1623 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1624 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1625 | goto refcount_error; |
1626 | } | |
d1f652f8 | 1627 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1628 | if (ret < 0) |
1629 | goto open_error; | |
d1f652f8 MD |
1630 | m = tracker_ids_list_file->private_data; |
1631 | ||
1632 | m->private = get_tracker(session, tracker_type); | |
1633 | BUG_ON(!m->private); | |
1634 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1635 | |
1636 | return file_fd; | |
1637 | ||
1638 | open_error: | |
9c1f4643 MD |
1639 | atomic_long_dec(&session->file->f_count); |
1640 | refcount_error: | |
d1f652f8 | 1641 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1642 | file_error: |
1643 | put_unused_fd(file_fd); | |
1644 | fd_error: | |
1645 | return ret; | |
1646 | } | |
1647 | ||
3c997079 MD |
1648 | /* |
1649 | * Enabler management. | |
1650 | */ | |
1651 | static | |
4993071a PP |
1652 | int lttng_match_enabler_star_glob(const char *desc_name, |
1653 | const char *pattern) | |
3c997079 | 1654 | { |
cbc19040 MD |
1655 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1656 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1657 | return 0; |
1658 | return 1; | |
1659 | } | |
1660 | ||
1661 | static | |
4ecb5ad5 MD |
1662 | int lttng_match_enabler_name(const char *desc_name, |
1663 | const char *name) | |
3c997079 | 1664 | { |
4ecb5ad5 | 1665 | if (strcmp(desc_name, name)) |
3c997079 MD |
1666 | return 0; |
1667 | return 1; | |
1668 | } | |
1669 | ||
3c997079 MD |
1670 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1671 | struct lttng_enabler *enabler) | |
1672 | { | |
4ecb5ad5 | 1673 | const char *desc_name, *enabler_name; |
badfe9f5 | 1674 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1675 | |
1676 | enabler_name = enabler->event_param.name; | |
1677 | switch (enabler->event_param.instrumentation) { | |
1678 | case LTTNG_KERNEL_TRACEPOINT: | |
1679 | desc_name = desc->name; | |
3b861b22 FD |
1680 | switch (enabler->format_type) { |
1681 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1682 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1683 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1684 | return lttng_match_enabler_name(desc_name, enabler_name); |
1685 | default: | |
1686 | return -EINVAL; | |
1687 | } | |
4ecb5ad5 MD |
1688 | break; |
1689 | case LTTNG_KERNEL_SYSCALL: | |
1690 | desc_name = desc->name; | |
badfe9f5 | 1691 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1692 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1693 | compat = true; |
1694 | } | |
4ecb5ad5 MD |
1695 | if (!strncmp(desc_name, "syscall_exit_", |
1696 | strlen("syscall_exit_"))) { | |
1697 | desc_name += strlen("syscall_exit_"); | |
1698 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1699 | strlen("syscall_entry_"))) { | |
1700 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1701 | entry = true; |
4ecb5ad5 MD |
1702 | } else { |
1703 | WARN_ON_ONCE(1); | |
1704 | return -EINVAL; | |
1705 | } | |
badfe9f5 MD |
1706 | switch (enabler->event_param.u.syscall.entryexit) { |
1707 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1708 | break; | |
1709 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1710 | if (!entry) | |
1711 | return 0; | |
1712 | break; | |
1713 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1714 | if (entry) | |
1715 | return 0; | |
1716 | break; | |
1717 | default: | |
1718 | return -EINVAL; | |
1719 | } | |
1720 | switch (enabler->event_param.u.syscall.abi) { | |
1721 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1722 | break; | |
1723 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1724 | if (compat) | |
1725 | return 0; | |
1726 | break; | |
1727 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1728 | if (!compat) | |
1729 | return 0; | |
1730 | break; | |
1731 | default: | |
1732 | return -EINVAL; | |
1733 | } | |
1734 | switch (enabler->event_param.u.syscall.match) { | |
1735 | case LTTNG_SYSCALL_MATCH_NAME: | |
3b861b22 FD |
1736 | switch (enabler->format_type) { |
1737 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1738 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1739 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1740 | return lttng_match_enabler_name(desc_name, enabler_name); |
1741 | default: | |
1742 | return -EINVAL; | |
1743 | } | |
1744 | break; | |
1745 | case LTTNG_SYSCALL_MATCH_NR: | |
1746 | return -EINVAL; /* Not implemented. */ | |
1747 | default: | |
1748 | return -EINVAL; | |
1749 | } | |
4ecb5ad5 MD |
1750 | break; |
1751 | default: | |
1752 | WARN_ON_ONCE(1); | |
1753 | return -EINVAL; | |
1754 | } | |
3c997079 MD |
1755 | } |
1756 | ||
1757 | static | |
b2bc0bc8 FD |
1758 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1759 | struct lttng_event *event) | |
3c997079 | 1760 | { |
b2bc0bc8 FD |
1761 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1762 | event_enabler); | |
1763 | ||
1764 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1765 | return 0; |
b2bc0bc8 FD |
1766 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1767 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1768 | return 1; |
1769 | else | |
1770 | return 0; | |
1771 | } | |
1772 | ||
b01155ba FD |
1773 | static |
1774 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1775 | struct lttng_event_notifier *event_notifier) | |
1776 | { | |
1777 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1778 | event_notifier_enabler); | |
1779 | ||
1780 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1781 | return 0; | |
1782 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1783 | && event_notifier->group == event_notifier_enabler->group | |
1784 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1785 | return 1; | |
1786 | else | |
1787 | return 0; | |
1788 | } | |
1789 | ||
3c997079 | 1790 | static |
b2bc0bc8 FD |
1791 | struct lttng_enabler_ref *lttng_enabler_ref( |
1792 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1793 | struct lttng_enabler *enabler) |
1794 | { | |
1795 | struct lttng_enabler_ref *enabler_ref; | |
1796 | ||
b2bc0bc8 | 1797 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1798 | if (enabler_ref->ref == enabler) |
1799 | return enabler_ref; | |
1800 | } | |
1801 | return NULL; | |
1802 | } | |
1803 | ||
3c997079 | 1804 | static |
1b917d6b | 1805 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1806 | { |
b2bc0bc8 | 1807 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1808 | struct lttng_probe_desc *probe_desc; |
1809 | const struct lttng_event_desc *desc; | |
1810 | int i; | |
1811 | struct list_head *probe_list; | |
1812 | ||
1813 | probe_list = lttng_get_probe_list_head(); | |
1814 | /* | |
1815 | * For each probe event, if we find that a probe event matches | |
1816 | * our enabler, create an associated lttng_event if not | |
1817 | * already present. | |
1818 | */ | |
1819 | list_for_each_entry(probe_desc, probe_list, head) { | |
1820 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1821 | int found = 0; | |
1822 | struct hlist_head *head; | |
3c997079 MD |
1823 | struct lttng_event *event; |
1824 | ||
1825 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1826 | if (!lttng_desc_match_enabler(desc, |
1827 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1828 | continue; |
3c997079 MD |
1829 | |
1830 | /* | |
1831 | * Check if already created. | |
1832 | */ | |
4a11ef1c FD |
1833 | head = utils_borrow_hash_table_bucket( |
1834 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1835 | desc->name); | |
d216ecae | 1836 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1837 | if (event->desc == desc |
b2bc0bc8 | 1838 | && event->chan == event_enabler->chan) |
3c997079 MD |
1839 | found = 1; |
1840 | } | |
1841 | if (found) | |
1842 | continue; | |
1843 | ||
1844 | /* | |
1845 | * We need to create an event for this | |
1846 | * event probe. | |
1847 | */ | |
b2bc0bc8 | 1848 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1849 | NULL, NULL, desc, |
1850 | LTTNG_KERNEL_TRACEPOINT); | |
1851 | if (!event) { | |
5a15f70c | 1852 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1853 | probe_desc->event_desc[i]->name); |
1854 | } | |
1855 | } | |
1856 | } | |
1857 | } | |
1858 | ||
b01155ba FD |
1859 | static |
1860 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1861 | { | |
1862 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1863 | struct lttng_probe_desc *probe_desc; | |
1864 | const struct lttng_event_desc *desc; | |
1865 | int i; | |
1866 | struct list_head *probe_list; | |
1867 | ||
1868 | probe_list = lttng_get_probe_list_head(); | |
1869 | /* | |
1870 | * For each probe event, if we find that a probe event matches | |
1871 | * our enabler, create an associated lttng_event_notifier if not | |
1872 | * already present. | |
1873 | */ | |
1874 | list_for_each_entry(probe_desc, probe_list, head) { | |
1875 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1876 | int found = 0; | |
1877 | struct hlist_head *head; | |
1878 | struct lttng_event_notifier *event_notifier; | |
1879 | ||
1880 | desc = probe_desc->event_desc[i]; | |
1881 | if (!lttng_desc_match_enabler(desc, | |
1882 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1883 | continue; | |
1884 | ||
1885 | /* | |
1886 | * Check if already created. | |
1887 | */ | |
1888 | head = utils_borrow_hash_table_bucket( | |
1889 | event_notifier_group->event_notifiers_ht.table, | |
1890 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1891 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1892 | if (event_notifier->desc == desc | |
1893 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1894 | found = 1; | |
1895 | } | |
1896 | if (found) | |
1897 | continue; | |
1898 | ||
1899 | /* | |
1900 | * We need to create a event_notifier for this event probe. | |
1901 | */ | |
1902 | event_notifier = _lttng_event_notifier_create(desc, | |
1903 | event_notifier_enabler->base.user_token, | |
1904 | event_notifier_group, NULL, NULL, | |
1905 | LTTNG_KERNEL_TRACEPOINT); | |
1906 | if (IS_ERR(event_notifier)) { | |
1907 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1908 | probe_desc->event_desc[i]->name); | |
1909 | } | |
1910 | } | |
1911 | } | |
1912 | } | |
1913 | ||
33a39a3c | 1914 | static |
1b917d6b | 1915 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1916 | { |
1917 | int ret; | |
1918 | ||
2d6d88c6 | 1919 | ret = lttng_syscalls_register_event(event_enabler->chan, NULL); |
33a39a3c MD |
1920 | WARN_ON_ONCE(ret); |
1921 | } | |
1922 | ||
8ced8896 FD |
1923 | static |
1924 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1925 | { | |
1926 | int ret; | |
1927 | ||
1928 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
1929 | WARN_ON_ONCE(ret); | |
1930 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
1931 | WARN_ON_ONCE(ret); | |
1932 | } | |
1933 | ||
33a39a3c MD |
1934 | /* |
1935 | * Create struct lttng_event if it is missing and present in the list of | |
1936 | * tracepoint probes. | |
1937 | * Should be called with sessions mutex held. | |
1938 | */ | |
1939 | static | |
b2bc0bc8 | 1940 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1941 | { |
b2bc0bc8 | 1942 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1943 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1944 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1945 | break; |
1946 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1947 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1948 | break; |
1949 | default: | |
1950 | WARN_ON_ONCE(1); | |
1951 | break; | |
1952 | } | |
1953 | } | |
1954 | ||
3c997079 | 1955 | /* |
b2bc0bc8 | 1956 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1957 | * and add backward reference from the event to the enabler. |
1958 | * Should be called with sessions mutex held. | |
1959 | */ | |
1960 | static | |
b2bc0bc8 | 1961 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1962 | { |
b2bc0bc8 FD |
1963 | struct lttng_channel *chan = event_enabler->chan; |
1964 | struct lttng_session *session = event_enabler->chan->session; | |
1965 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1966 | struct lttng_event *event; |
1967 | ||
b2bc0bc8 FD |
1968 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1969 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1970 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1971 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1972 | !strcmp(base_enabler->event_param.name, "*")) { | |
1973 | if (base_enabler->enabled) | |
badfe9f5 MD |
1974 | WRITE_ONCE(chan->syscall_all, 1); |
1975 | else | |
1976 | WRITE_ONCE(chan->syscall_all, 0); | |
1977 | } | |
1978 | ||
3c997079 | 1979 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 1980 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 1981 | |
b2bc0bc8 | 1982 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
1983 | list_for_each_entry(event, &session->events, list) { |
1984 | struct lttng_enabler_ref *enabler_ref; | |
1985 | ||
b2bc0bc8 | 1986 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 1987 | continue; |
b2bc0bc8 FD |
1988 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1989 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
1990 | if (!enabler_ref) { |
1991 | /* | |
1992 | * If no backward ref, create it. | |
b2bc0bc8 | 1993 | * Add backward ref from event to event_enabler. |
3c997079 MD |
1994 | */ |
1995 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1996 | if (!enabler_ref) | |
1997 | return -ENOMEM; | |
b2bc0bc8 | 1998 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
1999 | list_add(&enabler_ref->node, |
2000 | &event->enablers_ref_head); | |
2001 | } | |
2002 | ||
f127e61e MD |
2003 | /* |
2004 | * Link filter bytecodes if not linked yet. | |
2005 | */ | |
2dfda770 FD |
2006 | lttng_enabler_link_bytecode(event->desc, |
2007 | lttng_static_ctx, | |
2008 | &event->bytecode_runtime_head, | |
2009 | lttng_event_enabler_as_enabler(event_enabler)); | |
f127e61e | 2010 | |
3c997079 MD |
2011 | /* TODO: merge event context. */ |
2012 | } | |
2013 | return 0; | |
2014 | } | |
2015 | ||
b01155ba FD |
2016 | /* |
2017 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2018 | * tracepoint probes. | |
2019 | * Should be called with sessions mutex held. | |
2020 | */ | |
2021 | static | |
2022 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2023 | { | |
2024 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2025 | case LTTNG_KERNEL_TRACEPOINT: | |
2026 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2027 | break; | |
8ced8896 FD |
2028 | case LTTNG_KERNEL_SYSCALL: |
2029 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2030 | break; | |
b01155ba FD |
2031 | default: |
2032 | WARN_ON_ONCE(1); | |
2033 | break; | |
2034 | } | |
2035 | } | |
2036 | ||
2037 | /* | |
2038 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2039 | */ | |
2040 | static | |
2041 | int lttng_event_notifier_enabler_ref_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2042 | { | |
2043 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2044 | struct lttng_event_notifier *event_notifier; | |
2045 | ||
2046 | /* First ensure that probe event_notifiers are created for this enabler. */ | |
2047 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2048 | ||
2049 | /* Link the created event_notifier with its associated enabler. */ | |
2050 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2051 | struct lttng_enabler_ref *enabler_ref; | |
2052 | ||
2053 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2054 | continue; | |
2055 | ||
2056 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2057 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2058 | if (!enabler_ref) { | |
2059 | /* | |
2060 | * If no backward ref, create it. | |
2061 | * Add backward ref from event_notifier to enabler. | |
2062 | */ | |
2063 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2064 | if (!enabler_ref) | |
2065 | return -ENOMEM; | |
2066 | ||
2067 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2068 | event_notifier_enabler); | |
2069 | list_add(&enabler_ref->node, | |
2070 | &event_notifier->enablers_ref_head); | |
2071 | } | |
2072 | ||
2073 | /* | |
2074 | * Link filter bytecodes if not linked yet. | |
2075 | */ | |
2076 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2077 | lttng_static_ctx, &event_notifier->bytecode_runtime_head, | |
2078 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2079 | } | |
2080 | return 0; | |
2081 | } | |
2082 | ||
3c997079 MD |
2083 | /* |
2084 | * Called at module load: connect the probe on all enablers matching | |
2085 | * this event. | |
2086 | * Called with sessions lock held. | |
2087 | */ | |
2088 | int lttng_fix_pending_events(void) | |
2089 | { | |
2090 | struct lttng_session *session; | |
2091 | ||
2092 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2093 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2094 | return 0; |
2095 | } | |
2096 | ||
b01155ba FD |
2097 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2098 | struct lttng_event_notifier_group *event_notifier_group) | |
2099 | { | |
2100 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2101 | ||
2102 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2103 | node) { | |
2104 | if (event_notifier_enabler->base.enabled) | |
2105 | return true; | |
2106 | } | |
2107 | return false; | |
2108 | } | |
2109 | ||
2110 | bool lttng_event_notifier_active(void) | |
2111 | { | |
2112 | struct lttng_event_notifier_group *event_notifier_group; | |
2113 | ||
2114 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2115 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2116 | return true; | |
2117 | } | |
2118 | return false; | |
2119 | } | |
2120 | ||
2121 | int lttng_fix_pending_event_notifiers(void) | |
2122 | { | |
2123 | struct lttng_event_notifier_group *event_notifier_group; | |
2124 | ||
2125 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2126 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2127 | return 0; | |
2128 | } | |
2129 | ||
b2bc0bc8 FD |
2130 | struct lttng_event_enabler *lttng_event_enabler_create( |
2131 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2132 | struct lttng_kernel_event *event_param, |
2133 | struct lttng_channel *chan) | |
2134 | { | |
b2bc0bc8 | 2135 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2136 | |
b2bc0bc8 FD |
2137 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2138 | if (!event_enabler) | |
3c997079 | 2139 | return NULL; |
b2bc0bc8 FD |
2140 | event_enabler->base.format_type = format_type; |
2141 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2142 | memcpy(&event_enabler->base.event_param, event_param, | |
2143 | sizeof(event_enabler->base.event_param)); | |
2144 | event_enabler->chan = chan; | |
3c997079 | 2145 | /* ctx left NULL */ |
b2bc0bc8 FD |
2146 | event_enabler->base.enabled = 0; |
2147 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2148 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2149 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2150 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2151 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2152 | return event_enabler; |
3c997079 MD |
2153 | } |
2154 | ||
b2bc0bc8 | 2155 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2156 | { |
2157 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2158 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2159 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2160 | mutex_unlock(&sessions_mutex); |
2161 | return 0; | |
2162 | } | |
2163 | ||
b2bc0bc8 | 2164 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2165 | { |
2166 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2167 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2168 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2169 | mutex_unlock(&sessions_mutex); |
2170 | return 0; | |
2171 | } | |
2172 | ||
b2bc0bc8 | 2173 | static |
07dfc1d0 MD |
2174 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
2175 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2176 | { | |
2177 | struct lttng_filter_bytecode_node *bytecode_node; | |
2178 | uint32_t bytecode_len; | |
2179 | int ret; | |
2180 | ||
2181 | ret = get_user(bytecode_len, &bytecode->len); | |
2182 | if (ret) | |
2183 | return ret; | |
2184 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2185 | GFP_KERNEL); | |
2186 | if (!bytecode_node) | |
2187 | return -ENOMEM; | |
2188 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2189 | sizeof(*bytecode) + bytecode_len); | |
2190 | if (ret) | |
2191 | goto error_free; | |
b2bc0bc8 | 2192 | |
07dfc1d0 MD |
2193 | bytecode_node->enabler = enabler; |
2194 | /* Enforce length based on allocated size */ | |
2195 | bytecode_node->bc.len = bytecode_len; | |
2196 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2197 | |
07dfc1d0 MD |
2198 | return 0; |
2199 | ||
2200 | error_free: | |
2201 | kfree(bytecode_node); | |
2202 | return ret; | |
2203 | } | |
2204 | ||
b2bc0bc8 FD |
2205 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, |
2206 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2207 | { | |
2208 | int ret; | |
2209 | ret = lttng_enabler_attach_bytecode( | |
2210 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
2211 | if (ret) | |
2212 | goto error; | |
2213 | ||
2214 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2215 | return 0; | |
2216 | ||
2217 | error: | |
2218 | return ret; | |
2219 | } | |
2220 | ||
3aed4dca FD |
2221 | int lttng_event_add_callsite(struct lttng_event *event, |
2222 | struct lttng_kernel_event_callsite __user *callsite) | |
2223 | { | |
2224 | ||
2225 | switch (event->instrumentation) { | |
2226 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2227 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2228 | default: |
2229 | return -EINVAL; | |
2230 | } | |
2231 | } | |
2232 | ||
b2bc0bc8 | 2233 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2234 | struct lttng_kernel_context *context_param) |
2235 | { | |
2236 | return -ENOSYS; | |
2237 | } | |
2238 | ||
2239 | static | |
2240 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2241 | { | |
07dfc1d0 MD |
2242 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
2243 | ||
2244 | /* Destroy filter bytecode */ | |
2245 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2246 | &enabler->filter_bytecode_head, node) { | |
2247 | kfree(filter_node); | |
2248 | } | |
b2bc0bc8 FD |
2249 | } |
2250 | ||
2251 | static | |
2252 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2253 | { | |
2254 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2255 | |
3c997079 | 2256 | /* Destroy contexts */ |
b2bc0bc8 | 2257 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2258 | |
b2bc0bc8 FD |
2259 | list_del(&event_enabler->node); |
2260 | kfree(event_enabler); | |
3c997079 MD |
2261 | } |
2262 | ||
dffef45d FD |
2263 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2264 | struct lttng_event_notifier_group *event_notifier_group, | |
2265 | enum lttng_enabler_format_type format_type, | |
2266 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2267 | { | |
2268 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2269 | ||
2270 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2271 | if (!event_notifier_enabler) | |
2272 | return NULL; | |
2273 | ||
2274 | event_notifier_enabler->base.format_type = format_type; | |
2275 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
2276 | ||
2277 | memcpy(&event_notifier_enabler->base.event_param.name, event_notifier_param->event.name, | |
2278 | sizeof(event_notifier_enabler->base.event_param.name)); | |
2279 | event_notifier_enabler->base.event_param.instrumentation = event_notifier_param->event.instrumentation; | |
2280 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
2281 | ||
2282 | event_notifier_enabler->base.enabled = 0; | |
2283 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2284 | event_notifier_enabler->group = event_notifier_group; | |
2285 | ||
2286 | mutex_lock(&sessions_mutex); | |
2287 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2288 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2289 | |
2290 | mutex_unlock(&sessions_mutex); | |
2291 | ||
2292 | return event_notifier_enabler; | |
2293 | } | |
2294 | ||
2295 | int lttng_event_notifier_enabler_enable( | |
2296 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2297 | { | |
2298 | mutex_lock(&sessions_mutex); | |
2299 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2300 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2301 | mutex_unlock(&sessions_mutex); |
2302 | return 0; | |
2303 | } | |
2304 | ||
2305 | int lttng_event_notifier_enabler_disable( | |
2306 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2307 | { | |
2308 | mutex_lock(&sessions_mutex); | |
2309 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2310 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2311 | mutex_unlock(&sessions_mutex); |
2312 | return 0; | |
2313 | } | |
2314 | ||
2315 | int lttng_event_notifier_enabler_attach_bytecode( | |
2316 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2317 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2318 | { | |
2319 | int ret; | |
2320 | ||
2321 | ret = lttng_enabler_attach_bytecode( | |
2322 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
2323 | bytecode); | |
2324 | if (ret) | |
2325 | goto error; | |
2326 | ||
b01155ba | 2327 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2328 | return 0; |
2329 | ||
2330 | error: | |
2331 | return ret; | |
2332 | } | |
2333 | ||
9de67196 FD |
2334 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2335 | struct lttng_kernel_event_callsite __user *callsite) | |
2336 | { | |
2337 | ||
2338 | switch (event_notifier->instrumentation) { | |
2339 | case LTTNG_KERNEL_UPROBE: | |
2340 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2341 | callsite); | |
2342 | default: | |
2343 | return -EINVAL; | |
2344 | } | |
2345 | } | |
2346 | ||
dffef45d FD |
2347 | int lttng_event_notifier_enabler_attach_context( |
2348 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2349 | struct lttng_kernel_context *context_param) | |
2350 | { | |
2351 | return -ENOSYS; | |
2352 | } | |
2353 | ||
2354 | static | |
2355 | void lttng_event_notifier_enabler_destroy( | |
2356 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2357 | { | |
2358 | if (!event_notifier_enabler) { | |
2359 | return; | |
2360 | } | |
2361 | ||
2362 | list_del(&event_notifier_enabler->node); | |
2363 | ||
2364 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2365 | kfree(event_notifier_enabler); | |
2366 | } | |
2367 | ||
3c997079 | 2368 | /* |
b2bc0bc8 | 2369 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2370 | * session. |
2371 | * Should be called with sessions mutex held. | |
2372 | */ | |
2373 | static | |
b2bc0bc8 | 2374 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2375 | { |
b2bc0bc8 | 2376 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2377 | struct lttng_event *event; |
2378 | ||
b2bc0bc8 FD |
2379 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2380 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2381 | /* |
2382 | * For each event, if at least one of its enablers is enabled, | |
2383 | * and its channel and session transient states are enabled, we | |
2384 | * enable the event, else we disable it. | |
2385 | */ | |
2386 | list_for_each_entry(event, &session->events, list) { | |
2387 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2388 | struct lttng_bytecode_runtime *runtime; |
2389 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2390 | |
4ecb5ad5 MD |
2391 | switch (event->instrumentation) { |
2392 | case LTTNG_KERNEL_TRACEPOINT: | |
2393 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2394 | /* Enable events */ |
2395 | list_for_each_entry(enabler_ref, | |
2396 | &event->enablers_ref_head, node) { | |
2397 | if (enabler_ref->ref->enabled) { | |
2398 | enabled = 1; | |
2399 | break; | |
2400 | } | |
2401 | } | |
4ecb5ad5 MD |
2402 | break; |
2403 | default: | |
3c997079 MD |
2404 | /* Not handled with lazy sync. */ |
2405 | continue; | |
2406 | } | |
2407 | /* | |
2408 | * Enabled state is based on union of enablers, with | |
2409 | * intesection of session and channel transient enable | |
2410 | * states. | |
2411 | */ | |
2412 | enabled = enabled && session->tstate && event->chan->tstate; | |
2413 | ||
a8f2d0c7 | 2414 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2415 | /* |
2416 | * Sync tracepoint registration with event enabled | |
2417 | * state. | |
2418 | */ | |
2419 | if (enabled) { | |
2420 | register_event(event); | |
2421 | } else { | |
2422 | _lttng_event_unregister(event); | |
2423 | } | |
07dfc1d0 MD |
2424 | |
2425 | /* Check if has enablers without bytecode enabled */ | |
2426 | list_for_each_entry(enabler_ref, | |
2427 | &event->enablers_ref_head, node) { | |
2428 | if (enabler_ref->ref->enabled | |
2429 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2430 | has_enablers_without_bytecode = 1; | |
2431 | break; | |
2432 | } | |
2433 | } | |
2434 | event->has_enablers_without_bytecode = | |
2435 | has_enablers_without_bytecode; | |
2436 | ||
2437 | /* Enable filters */ | |
2438 | list_for_each_entry(runtime, | |
f127e61e | 2439 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 2440 | lttng_filter_sync_state(runtime); |
3c997079 MD |
2441 | } |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Apply enablers to session events, adding events to session if need | |
2446 | * be. It is required after each modification applied to an active | |
2447 | * session, and right before session "start". | |
2448 | * "lazy" sync means we only sync if required. | |
2449 | * Should be called with sessions mutex held. | |
2450 | */ | |
2451 | static | |
b2bc0bc8 | 2452 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2453 | { |
2454 | /* We can skip if session is not active */ | |
2455 | if (!session->active) | |
2456 | return; | |
b2bc0bc8 | 2457 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2458 | } |
2459 | ||
b01155ba FD |
2460 | static |
2461 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2462 | { | |
2463 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2464 | struct lttng_event_notifier *event_notifier; | |
2465 | ||
2466 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2467 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2468 | ||
2469 | /* | |
2470 | * For each event_notifier, if at least one of its enablers is enabled, | |
2471 | * we enable the event_notifier, else we disable it. | |
2472 | */ | |
2473 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2474 | struct lttng_enabler_ref *enabler_ref; | |
2475 | struct lttng_bytecode_runtime *runtime; | |
2476 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2477 | ||
2478 | switch (event_notifier->instrumentation) { | |
2479 | case LTTNG_KERNEL_TRACEPOINT: | |
2480 | case LTTNG_KERNEL_SYSCALL: | |
2481 | /* Enable event_notifiers */ | |
2482 | list_for_each_entry(enabler_ref, | |
2483 | &event_notifier->enablers_ref_head, node) { | |
2484 | if (enabler_ref->ref->enabled) { | |
2485 | enabled = 1; | |
2486 | break; | |
2487 | } | |
2488 | } | |
2489 | break; | |
2490 | default: | |
2491 | /* Not handled with sync. */ | |
2492 | continue; | |
2493 | } | |
2494 | ||
2495 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2496 | /* | |
2497 | * Sync tracepoint registration with event_notifier enabled | |
2498 | * state. | |
2499 | */ | |
2500 | if (enabled) { | |
2501 | if (!event_notifier->registered) | |
2502 | register_event_notifier(event_notifier); | |
2503 | } else { | |
2504 | if (event_notifier->registered) | |
2505 | _lttng_event_notifier_unregister(event_notifier); | |
2506 | } | |
2507 | ||
2508 | /* Check if has enablers without bytecode enabled */ | |
2509 | list_for_each_entry(enabler_ref, | |
2510 | &event_notifier->enablers_ref_head, node) { | |
2511 | if (enabler_ref->ref->enabled | |
2512 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2513 | has_enablers_without_bytecode = 1; | |
2514 | break; | |
2515 | } | |
2516 | } | |
2517 | event_notifier->has_enablers_without_bytecode = | |
2518 | has_enablers_without_bytecode; | |
2519 | ||
2520 | /* Enable filters */ | |
2521 | list_for_each_entry(runtime, | |
2522 | &event_notifier->bytecode_runtime_head, node) | |
2523 | lttng_filter_sync_state(runtime); | |
2524 | } | |
2525 | } | |
2526 | ||
1ec3f75a | 2527 | /* |
d83004aa JD |
2528 | * Serialize at most one packet worth of metadata into a metadata |
2529 | * channel. | |
92d9f5e6 MD |
2530 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2531 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2532 | * allows us to do racy operations such as looking for remaining space left in | |
2533 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2534 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2535 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2536 | * Returns the number of bytes written in the channel, 0 if no data |
2537 | * was written and a negative value on error. | |
1ec3f75a | 2538 | */ |
b3b8072b | 2539 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2540 | struct channel *chan, bool *coherent) |
d83004aa JD |
2541 | { |
2542 | struct lib_ring_buffer_ctx ctx; | |
2543 | int ret = 0; | |
2544 | size_t len, reserve_len; | |
2545 | ||
f613e3e6 | 2546 | /* |
92d9f5e6 MD |
2547 | * Ensure we support mutiple get_next / put sequences followed by |
2548 | * put_next. The metadata cache lock protects reading the metadata | |
2549 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2550 | * "flush" operations on the buffer invoked by different processes. | |
2551 | * Moreover, since the metadata cache memory can be reallocated, we | |
2552 | * need to have exclusive access against updates even though we only | |
2553 | * read it. | |
f613e3e6 | 2554 | */ |
92d9f5e6 | 2555 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2556 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2557 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2558 | goto end; |
f613e3e6 | 2559 | |
9616f0bf JD |
2560 | /* Metadata regenerated, change the version. */ |
2561 | if (stream->metadata_cache->version != stream->version) | |
2562 | stream->version = stream->metadata_cache->version; | |
2563 | ||
d83004aa | 2564 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2565 | stream->metadata_in; |
9de2c215 | 2566 | if (!len) |
de23d59d | 2567 | goto end; |
d83004aa | 2568 | reserve_len = min_t(size_t, |
b3b8072b | 2569 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2570 | len); |
b3b8072b | 2571 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2572 | sizeof(char), -1); |
2573 | /* | |
2574 | * If reservation failed, return an error to the caller. | |
2575 | */ | |
b3b8072b | 2576 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2577 | if (ret != 0) { |
2578 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2579 | stream->coherent = false; |
d83004aa JD |
2580 | goto end; |
2581 | } | |
b3b8072b | 2582 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2583 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2584 | reserve_len); |
b3b8072b | 2585 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2586 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2587 | if (reserve_len < len) |
8b97fd42 MD |
2588 | stream->coherent = false; |
2589 | else | |
2590 | stream->coherent = true; | |
d83004aa JD |
2591 | ret = reserve_len; |
2592 | ||
2593 | end: | |
8b97fd42 MD |
2594 | if (coherent) |
2595 | *coherent = stream->coherent; | |
92d9f5e6 | 2596 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2597 | return ret; |
2598 | } | |
2599 | ||
8b97fd42 MD |
2600 | static |
2601 | void lttng_metadata_begin(struct lttng_session *session) | |
2602 | { | |
3e75e2a7 MD |
2603 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2604 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2605 | } |
2606 | ||
2607 | static | |
2608 | void lttng_metadata_end(struct lttng_session *session) | |
2609 | { | |
3e75e2a7 MD |
2610 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2611 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2612 | struct lttng_metadata_stream *stream; | |
2613 | ||
3e75e2a7 MD |
2614 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2615 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2616 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2617 | } |
8b97fd42 MD |
2618 | } |
2619 | ||
d83004aa JD |
2620 | /* |
2621 | * Write the metadata to the metadata cache. | |
2622 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2623 | * The metadata cache lock protects us from concurrent read access from |
2624 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2625 | * The content of the printf is printed as a single atomic metadata |
2626 | * transaction. | |
d83004aa | 2627 | */ |
a90917c3 | 2628 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2629 | const char *fmt, ...) |
2630 | { | |
c099397a | 2631 | char *str; |
d83004aa | 2632 | size_t len; |
c099397a MD |
2633 | va_list ap; |
2634 | ||
585e5dcc | 2635 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2636 | |
2637 | va_start(ap, fmt); | |
2638 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2639 | va_end(ap); | |
2640 | if (!str) | |
2641 | return -ENOMEM; | |
2642 | ||
1ec3f75a | 2643 | len = strlen(str); |
3e75e2a7 | 2644 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2645 | if (session->metadata_cache->metadata_written + len > |
2646 | session->metadata_cache->cache_alloc) { | |
2647 | char *tmp_cache_realloc; | |
2648 | unsigned int tmp_cache_alloc_size; | |
2649 | ||
2650 | tmp_cache_alloc_size = max_t(unsigned int, | |
2651 | session->metadata_cache->cache_alloc + len, | |
2652 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2653 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2654 | if (!tmp_cache_realloc) |
2655 | goto err; | |
a606b6e8 ML |
2656 | if (session->metadata_cache->data) { |
2657 | memcpy(tmp_cache_realloc, | |
2658 | session->metadata_cache->data, | |
2659 | session->metadata_cache->cache_alloc); | |
2660 | vfree(session->metadata_cache->data); | |
2661 | } | |
2662 | ||
d83004aa JD |
2663 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2664 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2665 | } |
d83004aa JD |
2666 | memcpy(session->metadata_cache->data + |
2667 | session->metadata_cache->metadata_written, | |
2668 | str, len); | |
2669 | session->metadata_cache->metadata_written += len; | |
c099397a | 2670 | kfree(str); |
d83004aa | 2671 | |
d83004aa JD |
2672 | return 0; |
2673 | ||
2674 | err: | |
2675 | kfree(str); | |
2676 | return -ENOMEM; | |
c099397a MD |
2677 | } |
2678 | ||
f513b2bf MD |
2679 | static |
2680 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2681 | { | |
2682 | size_t i; | |
2683 | ||
2684 | for (i = 0; i < nesting; i++) { | |
2685 | int ret; | |
2686 | ||
2687 | ret = lttng_metadata_printf(session, " "); | |
2688 | if (ret) { | |
2689 | return ret; | |
2690 | } | |
2691 | } | |
2692 | return 0; | |
2693 | } | |
2694 | ||
ceabb767 MD |
2695 | static |
2696 | int lttng_field_name_statedump(struct lttng_session *session, | |
2697 | const struct lttng_event_field *field, | |
2698 | size_t nesting) | |
2699 | { | |
2700 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2701 | } | |
2702 | ||
2703 | static | |
2704 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2705 | const struct lttng_type *type, | |
2706 | size_t nesting) | |
2707 | { | |
2708 | int ret; | |
2709 | ||
2710 | WARN_ON_ONCE(type->atype != atype_integer); | |
2711 | ret = print_tabs(session, nesting); | |
2712 | if (ret) | |
2713 | return ret; | |
2714 | ret = lttng_metadata_printf(session, | |
2715 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2716 | type->u.integer.size, | |
2717 | type->u.integer.alignment, | |
2718 | type->u.integer.signedness, | |
2719 | (type->u.integer.encoding == lttng_encode_none) | |
2720 | ? "none" | |
2721 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2722 | ? "UTF8" | |
2723 | : "ASCII", | |
2724 | type->u.integer.base, | |
2725 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2726 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2727 | #else | |
2728 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2729 | #endif | |
2730 | ); | |
2731 | return ret; | |
2732 | } | |
2733 | ||
f513b2bf MD |
2734 | /* |
2735 | * Must be called with sessions_mutex held. | |
2736 | */ | |
2737 | static | |
2738 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2739 | const struct lttng_type *type, | |
2740 | size_t nesting) | |
2741 | { | |
2742 | int ret; | |
2743 | uint32_t i, nr_fields; | |
ceabb767 MD |
2744 | unsigned int alignment; |
2745 | ||
2746 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2747 | |
2748 | ret = print_tabs(session, nesting); | |
2749 | if (ret) | |
2750 | return ret; | |
2751 | ret = lttng_metadata_printf(session, | |
2752 | "struct {\n"); | |
2753 | if (ret) | |
2754 | return ret; | |
ceabb767 | 2755 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2756 | for (i = 0; i < nr_fields; i++) { |
2757 | const struct lttng_event_field *iter_field; | |
2758 | ||
ceabb767 | 2759 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2760 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2761 | if (ret) | |
2762 | return ret; | |
2763 | } | |
2764 | ret = print_tabs(session, nesting); | |
2765 | if (ret) | |
2766 | return ret; | |
ceabb767 MD |
2767 | alignment = type->u.struct_nestable.alignment; |
2768 | if (alignment) { | |
2769 | ret = lttng_metadata_printf(session, | |
2770 | "} align(%u)", | |
2771 | alignment); | |
2772 | } else { | |
2773 | ret = lttng_metadata_printf(session, | |
2774 | "}"); | |
2775 | } | |
f513b2bf MD |
2776 | return ret; |
2777 | } | |
2778 | ||
2779 | /* | |
2780 | * Must be called with sessions_mutex held. | |
2781 | */ | |
2782 | static | |
ceabb767 | 2783 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2784 | const struct lttng_event_field *field, |
2785 | size_t nesting) | |
2786 | { | |
2787 | int ret; | |
2788 | ||
2789 | ret = _lttng_struct_type_statedump(session, | |
2790 | &field->type, nesting); | |
2791 | if (ret) | |
2792 | return ret; | |
ceabb767 | 2793 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2794 | } |
2795 | ||
65c85aa6 MD |
2796 | /* |
2797 | * Must be called with sessions_mutex held. | |
2798 | */ | |
2799 | static | |
2800 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2801 | const struct lttng_type *type, | |
2802 | size_t nesting) | |
2803 | { | |
2804 | int ret; | |
2805 | uint32_t i, nr_choices; | |
2806 | ||
ceabb767 MD |
2807 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2808 | /* | |
2809 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2810 | */ | |
2811 | if (type->u.variant_nestable.alignment != 0) | |
2812 | return -EINVAL; | |
65c85aa6 MD |
2813 | ret = print_tabs(session, nesting); |
2814 | if (ret) | |
2815 | return ret; | |
2816 | ret = lttng_metadata_printf(session, | |
2817 | "variant <_%s> {\n", | |
ceabb767 | 2818 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2819 | if (ret) |
2820 | return ret; | |
ceabb767 | 2821 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2822 | for (i = 0; i < nr_choices; i++) { |
2823 | const struct lttng_event_field *iter_field; | |
2824 | ||
ceabb767 | 2825 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2826 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2827 | if (ret) | |
2828 | return ret; | |
2829 | } | |
2830 | ret = print_tabs(session, nesting); | |
2831 | if (ret) | |
2832 | return ret; | |
2833 | ret = lttng_metadata_printf(session, | |
2834 | "}"); | |
2835 | return ret; | |
2836 | } | |
2837 | ||
2838 | /* | |
2839 | * Must be called with sessions_mutex held. | |
2840 | */ | |
2841 | static | |
ceabb767 | 2842 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2843 | const struct lttng_event_field *field, |
2844 | size_t nesting) | |
2845 | { | |
2846 | int ret; | |
2847 | ||
2848 | ret = _lttng_variant_type_statedump(session, | |
2849 | &field->type, nesting); | |
2850 | if (ret) | |
2851 | return ret; | |
ceabb767 | 2852 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2853 | } |
2854 | ||
f513b2bf MD |
2855 | /* |
2856 | * Must be called with sessions_mutex held. | |
2857 | */ | |
2858 | static | |
ceabb767 | 2859 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2860 | const struct lttng_event_field *field, |
2861 | size_t nesting) | |
2862 | { | |
2863 | int ret; | |
2864 | const struct lttng_type *elem_type; | |
2865 | ||
ceabb767 MD |
2866 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2867 | ||
2868 | if (field->type.u.array_nestable.alignment) { | |
2869 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2870 | if (ret) |
2871 | return ret; | |
ceabb767 MD |
2872 | ret = lttng_metadata_printf(session, |
2873 | "struct { } align(%u) _%s_padding;\n", | |
2874 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2875 | field->name); | |
2876 | if (ret) | |
2877 | return ret; | |
2878 | } | |
2879 | /* | |
2880 | * Nested compound types: Only array of structures and variants are | |
2881 | * currently supported. | |
2882 | */ | |
2883 | elem_type = field->type.u.array_nestable.elem_type; | |
2884 | switch (elem_type->atype) { | |
2885 | case atype_integer: | |
2886 | case atype_struct_nestable: | |
2887 | case atype_variant_nestable: | |
2888 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2889 | if (ret) |
2890 | return ret; | |
2891 | break; | |
ceabb767 | 2892 | |
f513b2bf MD |
2893 | default: |
2894 | return -EINVAL; | |
2895 | } | |
2896 | ret = lttng_metadata_printf(session, | |
2897 | " _%s[%u];\n", | |
2898 | field->name, | |
ceabb767 | 2899 | field->type.u.array_nestable.length); |
f513b2bf MD |
2900 | return ret; |
2901 | } | |
2902 | ||
2903 | /* | |
2904 | * Must be called with sessions_mutex held. | |
2905 | */ | |
2906 | static | |
ceabb767 | 2907 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2908 | const struct lttng_event_field *field, |
2909 | size_t nesting) | |
2910 | { | |
2911 | int ret; | |
2912 | const char *length_name; | |
2913 | const struct lttng_type *elem_type; | |
2914 | ||
ceabb767 | 2915 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2916 | |
ceabb767 MD |
2917 | length_name = field->type.u.sequence_nestable.length_name; |
2918 | ||
2919 | if (field->type.u.sequence_nestable.alignment) { | |
2920 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2921 | if (ret) |
2922 | return ret; | |
ceabb767 MD |
2923 | ret = lttng_metadata_printf(session, |
2924 | "struct { } align(%u) _%s_padding;\n", | |
2925 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2926 | field->name); | |
2927 | if (ret) | |
2928 | return ret; | |
2929 | } | |
2930 | ||
2931 | /* | |
2932 | * Nested compound types: Only array of structures and variants are | |
2933 | * currently supported. | |
2934 | */ | |
2935 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2936 | switch (elem_type->atype) { | |
2937 | case atype_integer: | |
2938 | case atype_struct_nestable: | |
2939 | case atype_variant_nestable: | |
2940 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2941 | if (ret) |
2942 | return ret; | |
2943 | break; | |
ceabb767 | 2944 | |
f513b2bf MD |
2945 | default: |
2946 | return -EINVAL; | |
2947 | } | |
2948 | ret = lttng_metadata_printf(session, | |
2949 | " _%s[ _%s ];\n", | |
2950 | field->name, | |
ceabb767 | 2951 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2952 | return ret; |
2953 | } | |
2954 | ||
141ddf28 MD |
2955 | /* |
2956 | * Must be called with sessions_mutex held. | |
2957 | */ | |
2958 | static | |
ceabb767 MD |
2959 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2960 | const struct lttng_type *type, | |
141ddf28 MD |
2961 | size_t nesting) |
2962 | { | |
2963 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2964 | const struct lttng_type *container_type; |
141ddf28 MD |
2965 | int ret; |
2966 | unsigned int i, nr_entries; | |
2967 | ||
ceabb767 MD |
2968 | container_type = type->u.enum_nestable.container_type; |
2969 | if (container_type->atype != atype_integer) { | |
2970 | ret = -EINVAL; | |
2971 | goto end; | |
2972 | } | |
2973 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2974 | nr_entries = enum_desc->nr_entries; |
2975 | ||
2976 | ret = print_tabs(session, nesting); | |
2977 | if (ret) | |
2978 | goto end; | |
ceabb767 MD |
2979 | ret = lttng_metadata_printf(session, "enum : "); |
2980 | if (ret) | |
2981 | goto end; | |
2982 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2983 | if (ret) |
ceabb767 MD |
2984 | goto end; |
2985 | ret = lttng_metadata_printf(session, " {\n"); | |
2986 | if (ret) | |
2987 | goto end; | |
141ddf28 MD |
2988 | /* Dump all entries */ |
2989 | for (i = 0; i < nr_entries; i++) { | |
2990 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2991 | int j, len; | |
2992 | ||
2993 | ret = print_tabs(session, nesting + 1); | |
2994 | if (ret) | |
2995 | goto end; | |
2996 | ret = lttng_metadata_printf(session, | |
2997 | "\""); | |
2998 | if (ret) | |
2999 | goto end; | |
3000 | len = strlen(entry->string); | |
3001 | /* Escape the character '"' */ | |
3002 | for (j = 0; j < len; j++) { | |
3003 | char c = entry->string[j]; | |
3004 | ||
3005 | switch (c) { | |
3006 | case '"': | |
3007 | ret = lttng_metadata_printf(session, | |
3008 | "\\\""); | |
3009 | break; | |
3010 | case '\\': | |
3011 | ret = lttng_metadata_printf(session, | |
3012 | "\\\\"); | |
3013 | break; | |
3014 | default: | |
3015 | ret = lttng_metadata_printf(session, | |
3016 | "%c", c); | |
3017 | break; | |
3018 | } | |
3019 | if (ret) | |
3020 | goto end; | |
3021 | } | |
08ad1061 PP |
3022 | ret = lttng_metadata_printf(session, "\""); |
3023 | if (ret) | |
3024 | goto end; | |
3025 | ||
3026 | if (entry->options.is_auto) { | |
3027 | ret = lttng_metadata_printf(session, ",\n"); | |
3028 | if (ret) | |
3029 | goto end; | |
141ddf28 | 3030 | } else { |
7c559490 MD |
3031 | ret = lttng_metadata_printf(session, |
3032 | " = "); | |
3033 | if (ret) | |
3034 | goto end; | |
3035 | if (entry->start.signedness) | |
141ddf28 | 3036 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3037 | "%lld", (long long) entry->start.value); |
3038 | else | |
3039 | ret = lttng_metadata_printf(session, | |
3040 | "%llu", entry->start.value); | |
3041 | if (ret) | |
3042 | goto end; | |
3043 | if (entry->start.signedness == entry->end.signedness && | |
3044 | entry->start.value | |
3045 | == entry->end.value) { | |
141ddf28 | 3046 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3047 | ",\n"); |
3048 | } else { | |
3049 | if (entry->end.signedness) { | |
3050 | ret = lttng_metadata_printf(session, | |
3051 | " ... %lld,\n", | |
3052 | (long long) entry->end.value); | |
3053 | } else { | |
3054 | ret = lttng_metadata_printf(session, | |
3055 | " ... %llu,\n", | |
3056 | entry->end.value); | |
3057 | } | |
141ddf28 | 3058 | } |
7c559490 MD |
3059 | if (ret) |
3060 | goto end; | |
141ddf28 | 3061 | } |
141ddf28 MD |
3062 | } |
3063 | ret = print_tabs(session, nesting); | |
3064 | if (ret) | |
3065 | goto end; | |
ceabb767 | 3066 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3067 | end: |
3068 | return ret; | |
3069 | } | |
3070 | ||
d83004aa JD |
3071 | /* |
3072 | * Must be called with sessions_mutex held. | |
3073 | */ | |
c099397a | 3074 | static |
ceabb767 MD |
3075 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3076 | const struct lttng_event_field *field, | |
3077 | size_t nesting) | |
3078 | { | |
3079 | int ret; | |
3080 | ||
3081 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3082 | if (ret) | |
3083 | return ret; | |
3084 | return lttng_field_name_statedump(session, field, nesting); | |
3085 | } | |
3086 | ||
3087 | static | |
3088 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3089 | const struct lttng_event_field *field, | |
3090 | size_t nesting) | |
3091 | { | |
3092 | int ret; | |
3093 | ||
3094 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3095 | if (ret) | |
3096 | return ret; | |
3097 | return lttng_field_name_statedump(session, field, nesting); | |
3098 | } | |
3099 | ||
3100 | static | |
3101 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3102 | const struct lttng_type *type, | |
3103 | size_t nesting) | |
3104 | { | |
3105 | int ret; | |
3106 | ||
3107 | WARN_ON_ONCE(type->atype != atype_string); | |
3108 | /* Default encoding is UTF8 */ | |
3109 | ret = print_tabs(session, nesting); | |
3110 | if (ret) | |
3111 | return ret; | |
3112 | ret = lttng_metadata_printf(session, | |
3113 | "string%s", | |
3114 | type->u.string.encoding == lttng_encode_ASCII ? | |
3115 | " { encoding = ASCII; }" : ""); | |
3116 | return ret; | |
3117 | } | |
3118 | ||
3119 | static | |
3120 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3121 | const struct lttng_event_field *field, |
3122 | size_t nesting) | |
ceabb767 MD |
3123 | { |
3124 | int ret; | |
3125 | ||
3126 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3127 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3128 | if (ret) | |
3129 | return ret; | |
3130 | return lttng_field_name_statedump(session, field, nesting); | |
3131 | } | |
3132 | ||
3133 | /* | |
3134 | * Must be called with sessions_mutex held. | |
3135 | */ | |
3136 | static | |
3137 | int _lttng_type_statedump(struct lttng_session *session, | |
3138 | const struct lttng_type *type, | |
3139 | size_t nesting) | |
c099397a | 3140 | { |
c099397a | 3141 | int ret = 0; |
c099397a | 3142 | |
ceabb767 | 3143 | switch (type->atype) { |
8070f5c0 | 3144 | case atype_integer: |
ceabb767 | 3145 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3146 | break; |
ceabb767 MD |
3147 | case atype_enum_nestable: |
3148 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3149 | break; |
ceabb767 MD |
3150 | case atype_string: |
3151 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3152 | break; | |
3153 | case atype_struct_nestable: | |
3154 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3155 | break; |
ceabb767 MD |
3156 | case atype_variant_nestable: |
3157 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3158 | break; | |
3159 | ||
3160 | /* Nested arrays and sequences are not supported yet. */ | |
3161 | case atype_array_nestable: | |
3162 | case atype_sequence_nestable: | |
3163 | default: | |
3164 | WARN_ON_ONCE(1); | |
3165 | return -EINVAL; | |
8070f5c0 | 3166 | } |
ceabb767 MD |
3167 | return ret; |
3168 | } | |
8070f5c0 | 3169 | |
ceabb767 MD |
3170 | /* |
3171 | * Must be called with sessions_mutex held. | |
3172 | */ | |
3173 | static | |
3174 | int _lttng_field_statedump(struct lttng_session *session, | |
3175 | const struct lttng_event_field *field, | |
3176 | size_t nesting) | |
3177 | { | |
3178 | int ret = 0; | |
27d2368e | 3179 | |
ceabb767 MD |
3180 | switch (field->type.atype) { |
3181 | case atype_integer: | |
3182 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3183 | break; | |
3184 | case atype_enum_nestable: | |
3185 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3186 | break; |
8070f5c0 | 3187 | case atype_string: |
ceabb767 | 3188 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3189 | break; |
ceabb767 MD |
3190 | case atype_struct_nestable: |
3191 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3192 | break; |
ceabb767 MD |
3193 | case atype_array_nestable: |
3194 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3195 | break; |
ceabb767 MD |
3196 | case atype_sequence_nestable: |
3197 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3198 | break; |
ceabb767 MD |
3199 | case atype_variant_nestable: |
3200 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3201 | break; |
f513b2bf | 3202 | |
8070f5c0 MD |
3203 | default: |
3204 | WARN_ON_ONCE(1); | |
3205 | return -EINVAL; | |
3206 | } | |
3207 | return ret; | |
3208 | } | |
3209 | ||
3210 | static | |
a90917c3 | 3211 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3212 | struct lttng_ctx *ctx) |
3213 | { | |
3214 | int ret = 0; | |
3215 | int i; | |
3216 | ||
3217 | if (!ctx) | |
3218 | return 0; | |
3219 | for (i = 0; i < ctx->nr_fields; i++) { | |
3220 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3221 | ||
f513b2bf | 3222 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3223 | if (ret) |
3224 | return ret; | |
3225 | } | |
3226 | return ret; | |
3227 | } | |
3228 | ||
3229 | static | |
a90917c3 MD |
3230 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3231 | struct lttng_event *event) | |
8070f5c0 MD |
3232 | { |
3233 | const struct lttng_event_desc *desc = event->desc; | |
3234 | int ret = 0; | |
3235 | int i; | |
3236 | ||
3237 | for (i = 0; i < desc->nr_fields; i++) { | |
3238 | const struct lttng_event_field *field = &desc->fields[i]; | |
3239 | ||
f513b2bf | 3240 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3241 | if (ret) |
3242 | return ret; | |
c099397a MD |
3243 | } |
3244 | return ret; | |
3245 | } | |
3246 | ||
d83004aa JD |
3247 | /* |
3248 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3249 | * The entire event metadata is printed as a single atomic metadata |
3250 | * transaction. | |
d83004aa | 3251 | */ |
c099397a | 3252 | static |
a90917c3 MD |
3253 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3254 | struct lttng_channel *chan, | |
3255 | struct lttng_event *event) | |
c099397a MD |
3256 | { |
3257 | int ret = 0; | |
3258 | ||
585e5dcc | 3259 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3260 | return 0; |
d83004aa | 3261 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3262 | return 0; |
3263 | ||
8b97fd42 MD |
3264 | lttng_metadata_begin(session); |
3265 | ||
c099397a MD |
3266 | ret = lttng_metadata_printf(session, |
3267 | "event {\n" | |
ae734547 | 3268 | " name = \"%s\";\n" |
c099397a | 3269 | " id = %u;\n" |
b9074a1b | 3270 | " stream_id = %u;\n", |
c099397a MD |
3271 | event->desc->name, |
3272 | event->id, | |
3273 | event->chan->id); | |
3274 | if (ret) | |
3275 | goto end; | |
3276 | ||
b9074a1b MD |
3277 | if (event->ctx) { |
3278 | ret = lttng_metadata_printf(session, | |
3279 | " context := struct {\n"); | |
3280 | if (ret) | |
3281 | goto end; | |
3282 | } | |
a90917c3 | 3283 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3284 | if (ret) |
3285 | goto end; | |
b9074a1b MD |
3286 | if (event->ctx) { |
3287 | ret = lttng_metadata_printf(session, | |
3288 | " };\n"); | |
3289 | if (ret) | |
3290 | goto end; | |
3291 | } | |
8070f5c0 MD |
3292 | |
3293 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3294 | " fields := struct {\n" |
3295 | ); | |
3296 | if (ret) | |
3297 | goto end; | |
3298 | ||
a90917c3 | 3299 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3300 | if (ret) |
3301 | goto end; | |
3302 | ||
3303 | /* | |
3304 | * LTTng space reservation can only reserve multiples of the | |
3305 | * byte size. | |
3306 | */ | |
3307 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3308 | " };\n" |
3309 | "};\n\n"); | |
c099397a MD |
3310 | if (ret) |
3311 | goto end; | |
3312 | ||
c099397a MD |
3313 | event->metadata_dumped = 1; |
3314 | end: | |
8b97fd42 | 3315 | lttng_metadata_end(session); |
c099397a MD |
3316 | return ret; |
3317 | ||
3318 | } | |
3319 | ||
d83004aa JD |
3320 | /* |
3321 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3322 | * The entire channel metadata is printed as a single atomic metadata |
3323 | * transaction. | |
d83004aa | 3324 | */ |
c099397a | 3325 | static |
a90917c3 MD |
3326 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3327 | struct lttng_channel *chan) | |
c099397a MD |
3328 | { |
3329 | int ret = 0; | |
3330 | ||
585e5dcc | 3331 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3332 | return 0; |
d83004aa JD |
3333 | |
3334 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3335 | return 0; |
3336 | ||
8b97fd42 MD |
3337 | lttng_metadata_begin(session); |
3338 | ||
c099397a MD |
3339 | WARN_ON_ONCE(!chan->header_type); |
3340 | ret = lttng_metadata_printf(session, | |
3341 | "stream {\n" | |
3342 | " id = %u;\n" | |
9115fbdc | 3343 | " event.header := %s;\n" |
b9074a1b | 3344 | " packet.context := struct packet_context;\n", |
c099397a MD |
3345 | chan->id, |
3346 | chan->header_type == 1 ? "struct event_header_compact" : | |
3347 | "struct event_header_large"); | |
3348 | if (ret) | |
3349 | goto end; | |
3350 | ||
b9074a1b MD |
3351 | if (chan->ctx) { |
3352 | ret = lttng_metadata_printf(session, | |
3353 | " event.context := struct {\n"); | |
3354 | if (ret) | |
3355 | goto end; | |
3356 | } | |
a90917c3 | 3357 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3358 | if (ret) |
3359 | goto end; | |
b9074a1b MD |
3360 | if (chan->ctx) { |
3361 | ret = lttng_metadata_printf(session, | |
3362 | " };\n"); | |
3363 | if (ret) | |
3364 | goto end; | |
3365 | } | |
8070f5c0 MD |
3366 | |
3367 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3368 | "};\n\n"); |
8070f5c0 | 3369 | |
c099397a MD |
3370 | chan->metadata_dumped = 1; |
3371 | end: | |
8b97fd42 | 3372 | lttng_metadata_end(session); |
c099397a MD |
3373 | return ret; |
3374 | } | |
3375 | ||
d83004aa JD |
3376 | /* |
3377 | * Must be called with sessions_mutex held. | |
3378 | */ | |
9115fbdc | 3379 | static |
a90917c3 | 3380 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3381 | { |
3382 | return lttng_metadata_printf(session, | |
3383 | "struct packet_context {\n" | |
a3ccff4f MD |
3384 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3385 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3386 | " uint64_t content_size;\n" |
3387 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3388 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3389 | " unsigned long events_discarded;\n" |
9115fbdc | 3390 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3391 | "};\n\n" |
9115fbdc MD |
3392 | ); |
3393 | } | |
3394 | ||
3395 | /* | |
3396 | * Compact header: | |
3397 | * id: range: 0 - 30. | |
3398 | * id 31 is reserved to indicate an extended header. | |
3399 | * | |
3400 | * Large header: | |
3401 | * id: range: 0 - 65534. | |
3402 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3403 | * |
3404 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3405 | */ |
3406 | static | |
a90917c3 | 3407 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3408 | { |
3409 | return lttng_metadata_printf(session, | |
3410 | "struct event_header_compact {\n" | |
3411 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3412 | " variant <id> {\n" | |
3413 | " struct {\n" | |
a3ccff4f | 3414 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3415 | " } compact;\n" |
3416 | " struct {\n" | |
3417 | " uint32_t id;\n" | |
a3ccff4f | 3418 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3419 | " } extended;\n" |
3420 | " } v;\n" | |
3421 | "} align(%u);\n" | |
3422 | "\n" | |
3423 | "struct event_header_large {\n" | |
3424 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3425 | " variant <id> {\n" | |
3426 | " struct {\n" | |
a3ccff4f | 3427 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3428 | " } compact;\n" |
3429 | " struct {\n" | |
3430 | " uint32_t id;\n" | |
a3ccff4f | 3431 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3432 | " } extended;\n" |
3433 | " } v;\n" | |
3434 | "} align(%u);\n\n", | |
a90917c3 MD |
3435 | lttng_alignof(uint32_t) * CHAR_BIT, |
3436 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3437 | ); |
3438 | } | |
3439 | ||
a3ccff4f MD |
3440 | /* |
3441 | * Approximation of NTP time of day to clock monotonic correlation, | |
3442 | * taken at start of trace. | |
3443 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3444 | * in future versions. | |
5283350b MD |
3445 | * This function may return a negative offset. It may happen if the |
3446 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3447 | * |
3448 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3449 | * y2038 compliant. | |
a3ccff4f MD |
3450 | */ |
3451 | static | |
8967b2a3 | 3452 | int64_t measure_clock_offset(void) |
a3ccff4f | 3453 | { |
dcb93448 | 3454 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3455 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3456 | int64_t offset; |
a3ccff4f | 3457 | unsigned long flags; |
3636085f MJ |
3458 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3459 | struct timespec64 rts = { 0, 0 }; | |
3460 | #else | |
3461 | struct timespec rts = { 0, 0 }; | |
3462 | #endif | |
a3ccff4f MD |
3463 | |
3464 | /* Disable interrupts to increase correlation precision. */ | |
3465 | local_irq_save(flags); | |
3466 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3467 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3468 | ktime_get_real_ts64(&rts); | |
3469 | #else | |
216b6baa | 3470 | getnstimeofday(&rts); |
3636085f | 3471 | #endif |
a3ccff4f MD |
3472 | monotonic[1] = trace_clock_read64(); |
3473 | local_irq_restore(flags); | |
3474 | ||
dcb93448 | 3475 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3476 | realtime = (uint64_t) rts.tv_sec * tcf; |
3477 | if (tcf == NSEC_PER_SEC) { | |
3478 | realtime += rts.tv_nsec; | |
3479 | } else { | |
3480 | uint64_t n = rts.tv_nsec * tcf; | |
3481 | ||
3482 | do_div(n, NSEC_PER_SEC); | |
3483 | realtime += n; | |
3484 | } | |
dcb93448 | 3485 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3486 | return offset; |
3487 | } | |
3488 | ||
3eb95be4 JR |
3489 | static |
3490 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3491 | { | |
0f3eaad4 | 3492 | int ret = 0; |
3eb95be4 JR |
3493 | size_t i; |
3494 | char cur; | |
3495 | ||
3496 | i = 0; | |
3497 | cur = string[i]; | |
3498 | while (cur != '\0') { | |
3499 | switch (cur) { | |
3500 | case '\n': | |
3501 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3502 | break; | |
3503 | case '\\': | |
3504 | case '"': | |
3505 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3506 | if (ret) | |
3507 | goto error; | |
3508 | /* We still print the current char */ | |
3509 | /* Fallthrough */ | |
3510 | default: | |
3511 | ret = lttng_metadata_printf(session, "%c", cur); | |
3512 | break; | |
3513 | } | |
3514 | ||
3515 | if (ret) | |
3516 | goto error; | |
3517 | ||
3518 | cur = string[++i]; | |
3519 | } | |
3520 | error: | |
3521 | return ret; | |
3522 | } | |
3523 | ||
3524 | static | |
1c88f269 JR |
3525 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3526 | const char *field_value) | |
3eb95be4 JR |
3527 | { |
3528 | int ret; | |
3529 | ||
1c88f269 | 3530 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3531 | if (ret) |
3532 | goto error; | |
3533 | ||
1c88f269 | 3534 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3535 | if (ret) |
3536 | goto error; | |
3537 | ||
3538 | ret = lttng_metadata_printf(session, "\";\n"); | |
3539 | ||
3540 | error: | |
3541 | return ret; | |
3542 | } | |
3543 | ||
c099397a MD |
3544 | /* |
3545 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3546 | * Must be called with sessions_mutex held. |
c099397a MD |
3547 | */ |
3548 | static | |
a90917c3 | 3549 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3550 | { |
30bdb6e4 | 3551 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3552 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3553 | const char *product_uuid; |
a90917c3 MD |
3554 | struct lttng_channel *chan; |
3555 | struct lttng_event *event; | |
c099397a MD |
3556 | int ret = 0; |
3557 | ||
585e5dcc | 3558 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3559 | return 0; |
8b97fd42 MD |
3560 | |
3561 | lttng_metadata_begin(session); | |
3562 | ||
c099397a MD |
3563 | if (session->metadata_dumped) |
3564 | goto skip_session; | |
c099397a | 3565 | |
d793d5e1 | 3566 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3567 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3568 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3569 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3570 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3571 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3572 | |
3573 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3574 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3575 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3576 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3577 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3578 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3579 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3580 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3581 | "\n" |
3582 | "trace {\n" | |
3583 | " major = %u;\n" | |
3584 | " minor = %u;\n" | |
30bdb6e4 | 3585 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3586 | " byte_order = %s;\n" |
3587 | " packet.header := struct {\n" | |
3588 | " uint32_t magic;\n" | |
1ec3f75a | 3589 | " uint8_t uuid[16];\n" |
d793d5e1 | 3590 | " uint32_t stream_id;\n" |
5594698f | 3591 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3592 | " };\n" |
d793d5e1 | 3593 | "};\n\n", |
a90917c3 MD |
3594 | lttng_alignof(uint8_t) * CHAR_BIT, |
3595 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3596 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3597 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3598 | sizeof(unsigned long) * CHAR_BIT, |
3599 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3600 | CTF_SPEC_MAJOR, |
3601 | CTF_SPEC_MINOR, | |
d793d5e1 | 3602 | uuid_s, |
5214fa50 | 3603 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3604 | "be" |
3605 | #else | |
3606 | "le" | |
3607 | #endif | |
3608 | ); | |
3609 | if (ret) | |
3610 | goto end; | |
3611 | ||
99dc9597 MD |
3612 | ret = lttng_metadata_printf(session, |
3613 | "env {\n" | |
a6058143 | 3614 | " hostname = \"%s\";\n" |
c6c9e10f | 3615 | " domain = \"kernel\";\n" |
99dc9597 | 3616 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3617 | " kernel_release = \"%s\";\n" |
3618 | " kernel_version = \"%s\";\n" | |
3619 | " tracer_name = \"lttng-modules\";\n" | |
3620 | " tracer_major = %d;\n" | |
3621 | " tracer_minor = %d;\n" | |
3622 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3623 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3624 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3625 | utsname()->sysname, |
3626 | utsname()->release, | |
c6c9e10f MD |
3627 | utsname()->version, |
3628 | LTTNG_MODULES_MAJOR_VERSION, | |
3629 | LTTNG_MODULES_MINOR_VERSION, | |
3630 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3631 | ); |
3632 | if (ret) | |
3633 | goto end; | |
3634 | ||
1c88f269 JR |
3635 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3636 | if (ret) | |
3637 | goto end; | |
3638 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3639 | session->creation_time); | |
3eb95be4 JR |
3640 | if (ret) |
3641 | goto end; | |
3642 | ||
c88f762e GB |
3643 | /* Add the product UUID to the 'env' section */ |
3644 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3645 | if (product_uuid) { | |
3646 | ret = lttng_metadata_printf(session, | |
3647 | " product_uuid = \"%s\";\n", | |
3648 | product_uuid | |
3649 | ); | |
3650 | if (ret) | |
3651 | goto end; | |
3652 | } | |
3653 | ||
3654 | /* Close the 'env' section */ | |
3eb95be4 JR |
3655 | ret = lttng_metadata_printf(session, "};\n\n"); |
3656 | if (ret) | |
3657 | goto end; | |
3658 | ||
a3ccff4f MD |
3659 | ret = lttng_metadata_printf(session, |
3660 | "clock {\n" | |
2754583e MD |
3661 | " name = \"%s\";\n", |
3662 | trace_clock_name() | |
a82c63f1 MD |
3663 | ); |
3664 | if (ret) | |
3665 | goto end; | |
3666 | ||
3667 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3668 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3669 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3670 | clock_uuid_s |
3671 | ); | |
3672 | if (ret) | |
3673 | goto end; | |
3674 | } | |
3675 | ||
3676 | ret = lttng_metadata_printf(session, | |
2754583e | 3677 | " description = \"%s\";\n" |
a3ccff4f MD |
3678 | " freq = %llu; /* Frequency, in Hz */\n" |
3679 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3680 | " offset = %lld;\n" |
a3ccff4f | 3681 | "};\n\n", |
2754583e | 3682 | trace_clock_description(), |
a3ccff4f | 3683 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3684 | (long long) measure_clock_offset() |
a3ccff4f MD |
3685 | ); |
3686 | if (ret) | |
3687 | goto end; | |
3688 | ||
3689 | ret = lttng_metadata_printf(session, | |
3690 | "typealias integer {\n" | |
3691 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3692 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3693 | "} := uint27_clock_monotonic_t;\n" |
3694 | "\n" | |
3695 | "typealias integer {\n" | |
3696 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3697 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3698 | "} := uint32_clock_monotonic_t;\n" |
3699 | "\n" | |
3700 | "typealias integer {\n" | |
3701 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3702 | " map = clock.%s.value;\n" |
a3ccff4f | 3703 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3704 | trace_clock_name(), |
a3ccff4f | 3705 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3706 | trace_clock_name(), |
3707 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3708 | trace_clock_name() | |
a3ccff4f MD |
3709 | ); |
3710 | if (ret) | |
3711 | goto end; | |
3712 | ||
a90917c3 | 3713 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3714 | if (ret) |
3715 | goto end; | |
3716 | ||
a90917c3 | 3717 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3718 | if (ret) |
3719 | goto end; | |
3720 | ||
c099397a MD |
3721 | skip_session: |
3722 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3723 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3724 | if (ret) |
3725 | goto end; | |
3726 | } | |
3727 | ||
3728 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3729 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3730 | if (ret) |
3731 | goto end; | |
3732 | } | |
3733 | session->metadata_dumped = 1; | |
3734 | end: | |
8b97fd42 | 3735 | lttng_metadata_end(session); |
c099397a MD |
3736 | return ret; |
3737 | } | |
3738 | ||
c0e31d2e | 3739 | /** |
a90917c3 | 3740 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3741 | * @transport: transport structure |
3742 | * | |
3743 | * Registers a transport which can be used as output to extract the data out of | |
3744 | * LTTng. The module calling this registration function must ensure that no | |
3745 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3746 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3747 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3748 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3749 | * after its registration must it synchronize the TLBs. |
3750 | */ | |
a90917c3 | 3751 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3752 | { |
3753 | /* | |
3754 | * Make sure no page fault can be triggered by the module about to be | |
3755 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3756 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3757 | */ |
263b6c88 | 3758 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3759 | |
3760 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3761 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3762 | mutex_unlock(&sessions_mutex); |
3763 | } | |
a90917c3 | 3764 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3765 | |
3766 | /** | |
a90917c3 | 3767 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3768 | * @transport: transport structure |
3769 | */ | |
a90917c3 | 3770 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3771 | { |
3772 | mutex_lock(&sessions_mutex); | |
3773 | list_del(&transport->node); | |
3774 | mutex_unlock(&sessions_mutex); | |
3775 | } | |
a90917c3 | 3776 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3777 | |
894ce5dc | 3778 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3779 | |
3780 | enum cpuhp_state lttng_hp_prepare; | |
3781 | enum cpuhp_state lttng_hp_online; | |
3782 | ||
3783 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3784 | { | |
3785 | struct lttng_cpuhp_node *lttng_node; | |
3786 | ||
3787 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3788 | switch (lttng_node->component) { | |
3789 | case LTTNG_RING_BUFFER_FRONTEND: | |
3790 | return 0; | |
3791 | case LTTNG_RING_BUFFER_BACKEND: | |
3792 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3793 | case LTTNG_RING_BUFFER_ITER: | |
3794 | return 0; | |
3795 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3796 | return 0; | |
3797 | default: | |
3798 | return -EINVAL; | |
3799 | } | |
3800 | } | |
3801 | ||
3802 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3803 | { | |
3804 | struct lttng_cpuhp_node *lttng_node; | |
3805 | ||
3806 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3807 | switch (lttng_node->component) { | |
3808 | case LTTNG_RING_BUFFER_FRONTEND: | |
3809 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3810 | case LTTNG_RING_BUFFER_BACKEND: | |
3811 | return 0; | |
3812 | case LTTNG_RING_BUFFER_ITER: | |
3813 | return 0; | |
3814 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3815 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3816 | default: | |
3817 | return -EINVAL; | |
3818 | } | |
3819 | } | |
3820 | ||
3821 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3822 | { | |
3823 | struct lttng_cpuhp_node *lttng_node; | |
3824 | ||
3825 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3826 | switch (lttng_node->component) { | |
3827 | case LTTNG_RING_BUFFER_FRONTEND: | |
3828 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3829 | case LTTNG_RING_BUFFER_BACKEND: | |
3830 | return 0; | |
3831 | case LTTNG_RING_BUFFER_ITER: | |
3832 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3833 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3834 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3835 | default: | |
3836 | return -EINVAL; | |
3837 | } | |
3838 | } | |
3839 | ||
3840 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3841 | { | |
3842 | struct lttng_cpuhp_node *lttng_node; | |
3843 | ||
3844 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3845 | switch (lttng_node->component) { | |
3846 | case LTTNG_RING_BUFFER_FRONTEND: | |
3847 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3848 | case LTTNG_RING_BUFFER_BACKEND: | |
3849 | return 0; | |
3850 | case LTTNG_RING_BUFFER_ITER: | |
3851 | return 0; | |
3852 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3853 | return 0; | |
3854 | default: | |
3855 | return -EINVAL; | |
3856 | } | |
3857 | } | |
3858 | ||
3859 | static int __init lttng_init_cpu_hotplug(void) | |
3860 | { | |
3861 | int ret; | |
3862 | ||
3863 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3864 | lttng_hotplug_prepare, | |
3865 | lttng_hotplug_dead); | |
3866 | if (ret < 0) { | |
3867 | return ret; | |
3868 | } | |
3869 | lttng_hp_prepare = ret; | |
3870 | lttng_rb_set_hp_prepare(ret); | |
3871 | ||
3872 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3873 | lttng_hotplug_online, | |
3874 | lttng_hotplug_offline); | |
3875 | if (ret < 0) { | |
3876 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3877 | lttng_hp_prepare = 0; | |
3878 | return ret; | |
3879 | } | |
3880 | lttng_hp_online = ret; | |
3881 | lttng_rb_set_hp_online(ret); | |
3882 | ||
3883 | return 0; | |
3884 | } | |
3885 | ||
3886 | static void __exit lttng_exit_cpu_hotplug(void) | |
3887 | { | |
3888 | lttng_rb_set_hp_online(0); | |
3889 | cpuhp_remove_multi_state(lttng_hp_online); | |
3890 | lttng_rb_set_hp_prepare(0); | |
3891 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3892 | } | |
3893 | ||
1ee63d8d | 3894 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3895 | static int lttng_init_cpu_hotplug(void) |
3896 | { | |
3897 | return 0; | |
3898 | } | |
3899 | static void lttng_exit_cpu_hotplug(void) | |
3900 | { | |
3901 | } | |
1ee63d8d | 3902 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3903 | |
3904 | ||
a90917c3 | 3905 | static int __init lttng_events_init(void) |
4e3c1b9b | 3906 | { |
1c25284c MD |
3907 | int ret; |
3908 | ||
453b2495 JD |
3909 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3910 | if (ret) | |
3911 | return ret; | |
389d7070 | 3912 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3913 | if (ret) |
3914 | return ret; | |
3915 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3916 | if (ret) |
3917 | return ret; | |
3918 | ret = lttng_probes_init(); | |
389d7070 MD |
3919 | if (ret) |
3920 | return ret; | |
07dfc1d0 | 3921 | ret = lttng_context_init(); |
20591cf7 MD |
3922 | if (ret) |
3923 | return ret; | |
07dfc1d0 MD |
3924 | ret = lttng_tracepoint_init(); |
3925 | if (ret) | |
3926 | goto error_tp; | |
a90917c3 | 3927 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3928 | if (!event_cache) { |
3929 | ret = -ENOMEM; | |
dffef45d FD |
3930 | goto error_kmem_event; |
3931 | } | |
3932 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
3933 | if (!event_notifier_cache) { | |
3934 | ret = -ENOMEM; | |
3935 | goto error_kmem_event_notifier; | |
20591cf7 | 3936 | } |
80996790 | 3937 | ret = lttng_abi_init(); |
02119ee5 MD |
3938 | if (ret) |
3939 | goto error_abi; | |
0c956676 MD |
3940 | ret = lttng_logger_init(); |
3941 | if (ret) | |
3942 | goto error_logger; | |
1e367326 MD |
3943 | ret = lttng_init_cpu_hotplug(); |
3944 | if (ret) | |
3945 | goto error_hotplug; | |
101215b7 | 3946 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3947 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3948 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3949 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3950 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3951 | LTTNG_VERSION_NAME, |
3952 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3953 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3954 | #else | |
3955 | "", | |
3956 | #endif | |
3957 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3958 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3959 | #else | |
3960 | ""); | |
3961 | #endif | |
4e3c1b9b | 3962 | return 0; |
0c956676 | 3963 | |
1e367326 MD |
3964 | error_hotplug: |
3965 | lttng_logger_exit(); | |
0c956676 MD |
3966 | error_logger: |
3967 | lttng_abi_exit(); | |
02119ee5 | 3968 | error_abi: |
dffef45d FD |
3969 | kmem_cache_destroy(event_notifier_cache); |
3970 | error_kmem_event_notifier: | |
1c25284c | 3971 | kmem_cache_destroy(event_cache); |
dffef45d | 3972 | error_kmem_event: |
20591cf7 | 3973 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
3974 | error_tp: |
3975 | lttng_context_exit(); | |
101215b7 | 3976 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3977 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3978 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3979 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3980 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3981 | LTTNG_VERSION_NAME, |
3982 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3983 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3984 | #else | |
3985 | "", | |
3986 | #endif | |
3987 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3988 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3989 | #else | |
3990 | ""); | |
3991 | #endif | |
1c25284c | 3992 | return ret; |
4e3c1b9b MD |
3993 | } |
3994 | ||
a90917c3 | 3995 | module_init(lttng_events_init); |
11b5a3c2 | 3996 | |
a90917c3 | 3997 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3998 | { |
a90917c3 | 3999 | struct lttng_session *session, *tmpsession; |
92e94819 | 4000 | |
1e367326 | 4001 | lttng_exit_cpu_hotplug(); |
0c956676 | 4002 | lttng_logger_exit(); |
80996790 | 4003 | lttng_abi_exit(); |
92e94819 | 4004 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4005 | lttng_session_destroy(session); |
11b5a3c2 | 4006 | kmem_cache_destroy(event_cache); |
dffef45d | 4007 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4008 | lttng_tracepoint_exit(); |
07dfc1d0 | 4009 | lttng_context_exit(); |
101215b7 | 4010 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4011 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4012 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4013 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4014 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4015 | LTTNG_VERSION_NAME, |
4016 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4017 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4018 | #else | |
4019 | "", | |
4020 | #endif | |
4021 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4022 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4023 | #else | |
4024 | ""); | |
4025 | #endif | |
4e3c1b9b | 4026 | } |
92e94819 | 4027 | |
a90917c3 | 4028 | module_exit(lttng_events_exit); |
11b5a3c2 | 4029 | |
7ca11e77 | 4030 | #include <generated/patches.h> |
101215b7 MJ |
4031 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4032 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4033 | #endif | |
4034 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4035 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4036 | #endif | |
92e94819 MD |
4037 | MODULE_LICENSE("GPL and additional rights"); |
4038 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4039 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4040 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4041 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4042 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4043 | LTTNG_MODULES_EXTRAVERSION); |