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 | |
8a8ac9a8 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 | ||
8a8ac9a8 FD |
346 | kfree(event_notifier_group->sc_filter); |
347 | ||
dffef45d FD |
348 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
349 | &event_notifier_group->enablers_head, node) | |
350 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
351 | ||
352 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
353 | &event_notifier_group->event_notifiers_head, list) | |
354 | _lttng_event_notifier_destroy(event_notifier); | |
355 | ||
750b05f2 FD |
356 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
357 | module_put(event_notifier_group->transport->owner); | |
358 | list_del(&event_notifier_group->node); | |
dffef45d | 359 | |
750b05f2 FD |
360 | mutex_unlock(&sessions_mutex); |
361 | lttng_kvfree(event_notifier_group); | |
362 | } | |
363 | ||
601252cf MD |
364 | int lttng_session_statedump(struct lttng_session *session) |
365 | { | |
366 | int ret; | |
367 | ||
368 | mutex_lock(&sessions_mutex); | |
369 | ret = lttng_statedump_start(session); | |
370 | mutex_unlock(&sessions_mutex); | |
371 | return ret; | |
372 | } | |
373 | ||
a90917c3 | 374 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
375 | { |
376 | int ret = 0; | |
a90917c3 | 377 | struct lttng_channel *chan; |
c0e31d2e MD |
378 | |
379 | mutex_lock(&sessions_mutex); | |
380 | if (session->active) { | |
381 | ret = -EBUSY; | |
382 | goto end; | |
383 | } | |
c099397a | 384 | |
3c997079 MD |
385 | /* Set transient enabler state to "enabled" */ |
386 | session->tstate = 1; | |
387 | ||
4ef81e4a | 388 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 389 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 390 | |
c099397a MD |
391 | /* |
392 | * Snapshot the number of events per channel to know the type of header | |
393 | * we need to use. | |
394 | */ | |
395 | list_for_each_entry(chan, &session->chan, list) { | |
396 | if (chan->header_type) | |
397 | continue; /* don't change it if session stop/restart */ | |
398 | if (chan->free_event_id < 31) | |
399 | chan->header_type = 1; /* compact */ | |
400 | else | |
401 | chan->header_type = 2; /* large */ | |
402 | } | |
403 | ||
64af2437 | 404 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
405 | list_for_each_entry(chan, &session->chan, list) { |
406 | if (chan->channel_type != METADATA_CHANNEL) | |
407 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
408 | } | |
64af2437 | 409 | |
a8f2d0c7 MJ |
410 | WRITE_ONCE(session->active, 1); |
411 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 412 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 413 | if (ret) { |
a8f2d0c7 | 414 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
415 | goto end; |
416 | } | |
417 | ret = lttng_statedump_start(session); | |
360f38ea | 418 | if (ret) |
a8f2d0c7 | 419 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
420 | end: |
421 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 422 | return ret; |
c0e31d2e MD |
423 | } |
424 | ||
a90917c3 | 425 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
426 | { |
427 | int ret = 0; | |
64af2437 | 428 | struct lttng_channel *chan; |
c0e31d2e MD |
429 | |
430 | mutex_lock(&sessions_mutex); | |
431 | if (!session->active) { | |
432 | ret = -EBUSY; | |
433 | goto end; | |
434 | } | |
a8f2d0c7 | 435 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
436 | |
437 | /* Set transient enabler state to "disabled" */ | |
438 | session->tstate = 0; | |
b2bc0bc8 | 439 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
440 | |
441 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
442 | list_for_each_entry(chan, &session->chan, list) { |
443 | if (chan->channel_type != METADATA_CHANNEL) | |
444 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
445 | } | |
c0e31d2e MD |
446 | end: |
447 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 448 | return ret; |
c0e31d2e MD |
449 | } |
450 | ||
9616f0bf JD |
451 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
452 | { | |
453 | int ret = 0; | |
454 | struct lttng_channel *chan; | |
455 | struct lttng_event *event; | |
456 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
457 | struct lttng_metadata_stream *stream; | |
458 | ||
459 | mutex_lock(&sessions_mutex); | |
460 | if (!session->active) { | |
461 | ret = -EBUSY; | |
462 | goto end; | |
463 | } | |
464 | ||
465 | mutex_lock(&cache->lock); | |
466 | memset(cache->data, 0, cache->cache_alloc); | |
467 | cache->metadata_written = 0; | |
468 | cache->version++; | |
469 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
470 | stream->metadata_out = 0; | |
471 | stream->metadata_in = 0; | |
472 | } | |
473 | mutex_unlock(&cache->lock); | |
474 | ||
475 | session->metadata_dumped = 0; | |
476 | list_for_each_entry(chan, &session->chan, list) { | |
477 | chan->metadata_dumped = 0; | |
478 | } | |
479 | ||
480 | list_for_each_entry(event, &session->events, list) { | |
481 | event->metadata_dumped = 0; | |
482 | } | |
483 | ||
484 | ret = _lttng_session_metadata_statedump(session); | |
485 | ||
486 | end: | |
487 | mutex_unlock(&sessions_mutex); | |
488 | return ret; | |
489 | } | |
490 | ||
a90917c3 | 491 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 492 | { |
3c997079 | 493 | int ret = 0; |
e64957da | 494 | |
3c997079 MD |
495 | mutex_lock(&sessions_mutex); |
496 | if (channel->channel_type == METADATA_CHANNEL) { | |
497 | ret = -EPERM; | |
498 | goto end; | |
499 | } | |
500 | if (channel->enabled) { | |
501 | ret = -EEXIST; | |
502 | goto end; | |
503 | } | |
504 | /* Set transient enabler state to "enabled" */ | |
505 | channel->tstate = 1; | |
b2bc0bc8 | 506 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 507 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 508 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
509 | end: |
510 | mutex_unlock(&sessions_mutex); | |
511 | return ret; | |
e64957da MD |
512 | } |
513 | ||
a90917c3 | 514 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 515 | { |
3c997079 | 516 | int ret = 0; |
e64957da | 517 | |
3c997079 MD |
518 | mutex_lock(&sessions_mutex); |
519 | if (channel->channel_type == METADATA_CHANNEL) { | |
520 | ret = -EPERM; | |
521 | goto end; | |
522 | } | |
523 | if (!channel->enabled) { | |
524 | ret = -EEXIST; | |
525 | goto end; | |
526 | } | |
527 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 528 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
529 | /* Set transient enabler state to "enabled" */ |
530 | channel->tstate = 0; | |
b2bc0bc8 | 531 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
532 | end: |
533 | mutex_unlock(&sessions_mutex); | |
534 | return ret; | |
e64957da MD |
535 | } |
536 | ||
a90917c3 | 537 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 538 | { |
3c997079 | 539 | int ret = 0; |
e64957da | 540 | |
3c997079 MD |
541 | mutex_lock(&sessions_mutex); |
542 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
543 | ret = -EPERM; | |
544 | goto end; | |
545 | } | |
546 | if (event->enabled) { | |
547 | ret = -EEXIST; | |
548 | goto end; | |
549 | } | |
a0493bef MD |
550 | switch (event->instrumentation) { |
551 | case LTTNG_KERNEL_TRACEPOINT: | |
552 | case LTTNG_KERNEL_SYSCALL: | |
553 | ret = -EINVAL; | |
554 | break; | |
555 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 556 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 557 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 558 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
559 | break; |
560 | case LTTNG_KERNEL_KRETPROBE: | |
561 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
562 | break; | |
e884017c | 563 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
564 | default: |
565 | WARN_ON_ONCE(1); | |
566 | ret = -EINVAL; | |
567 | } | |
3c997079 MD |
568 | end: |
569 | mutex_unlock(&sessions_mutex); | |
570 | return ret; | |
e64957da MD |
571 | } |
572 | ||
a90917c3 | 573 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 574 | { |
3c997079 | 575 | int ret = 0; |
e64957da | 576 | |
3c997079 MD |
577 | mutex_lock(&sessions_mutex); |
578 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
579 | ret = -EPERM; | |
580 | goto end; | |
581 | } | |
582 | if (!event->enabled) { | |
583 | ret = -EEXIST; | |
584 | goto end; | |
585 | } | |
a0493bef MD |
586 | switch (event->instrumentation) { |
587 | case LTTNG_KERNEL_TRACEPOINT: | |
588 | case LTTNG_KERNEL_SYSCALL: | |
589 | ret = -EINVAL; | |
590 | break; | |
591 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 592 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 593 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 594 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
595 | break; |
596 | case LTTNG_KERNEL_KRETPROBE: | |
597 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
598 | break; | |
e884017c | 599 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
600 | default: |
601 | WARN_ON_ONCE(1); | |
602 | ret = -EINVAL; | |
603 | } | |
3c997079 MD |
604 | end: |
605 | mutex_unlock(&sessions_mutex); | |
606 | return ret; | |
e64957da MD |
607 | } |
608 | ||
dffef45d FD |
609 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
610 | { | |
611 | int ret = 0; | |
612 | ||
613 | mutex_lock(&sessions_mutex); | |
614 | if (event_notifier->enabled) { | |
615 | ret = -EEXIST; | |
616 | goto end; | |
617 | } | |
618 | switch (event_notifier->instrumentation) { | |
619 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 620 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
621 | ret = -EINVAL; |
622 | break; | |
dffef45d | 623 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 624 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
625 | WRITE_ONCE(event_notifier->enabled, 1); |
626 | break; | |
dffef45d | 627 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
628 | case LTTNG_KERNEL_NOOP: |
629 | case LTTNG_KERNEL_KRETPROBE: | |
630 | default: | |
631 | WARN_ON_ONCE(1); | |
632 | ret = -EINVAL; | |
633 | } | |
634 | end: | |
635 | mutex_unlock(&sessions_mutex); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
640 | { | |
641 | int ret = 0; | |
642 | ||
643 | mutex_lock(&sessions_mutex); | |
644 | if (!event_notifier->enabled) { | |
645 | ret = -EEXIST; | |
646 | goto end; | |
647 | } | |
648 | switch (event_notifier->instrumentation) { | |
649 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 650 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
651 | ret = -EINVAL; |
652 | break; | |
dffef45d | 653 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 654 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
655 | WRITE_ONCE(event_notifier->enabled, 0); |
656 | break; | |
dffef45d | 657 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
658 | case LTTNG_KERNEL_NOOP: |
659 | case LTTNG_KERNEL_KRETPROBE: | |
660 | default: | |
661 | WARN_ON_ONCE(1); | |
662 | ret = -EINVAL; | |
663 | } | |
664 | end: | |
665 | mutex_unlock(&sessions_mutex); | |
666 | return ret; | |
667 | } | |
668 | ||
a90917c3 | 669 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
670 | const char *transport_name, |
671 | void *buf_addr, | |
4e3c1b9b MD |
672 | size_t subbuf_size, size_t num_subbuf, |
673 | unsigned int switch_timer_interval, | |
d83004aa JD |
674 | unsigned int read_timer_interval, |
675 | enum channel_type channel_type) | |
4e3c1b9b | 676 | { |
a90917c3 MD |
677 | struct lttng_channel *chan; |
678 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
679 | |
680 | mutex_lock(&sessions_mutex); | |
d83004aa | 681 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 682 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 683 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 684 | if (!transport) { |
5a15f70c | 685 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 686 | transport_name); |
c0e31d2e | 687 | goto notransport; |
f3d01b96 | 688 | } |
a33c9927 | 689 | if (!try_module_get(transport->owner)) { |
5a15f70c | 690 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
691 | goto notransport; |
692 | } | |
a90917c3 | 693 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 694 | if (!chan) |
c0e31d2e | 695 | goto nomem; |
4e3c1b9b | 696 | chan->session = session; |
05d32c64 | 697 | chan->id = session->free_chan_id++; |
3b731ab1 | 698 | chan->ops = &transport->ops; |
125b4df4 MD |
699 | /* |
700 | * Note: the channel creation op already writes into the packet | |
701 | * headers. Therefore the "chan" information used as input | |
702 | * should be already accessible. | |
703 | */ | |
5f5ddf01 MD |
704 | chan->chan = transport->ops.channel_create(transport_name, |
705 | chan, buf_addr, subbuf_size, num_subbuf, | |
706 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
707 | if (!chan->chan) |
708 | goto create_error; | |
3c997079 | 709 | chan->tstate = 1; |
e64957da | 710 | chan->enabled = 1; |
a33c9927 | 711 | chan->transport = transport; |
d83004aa | 712 | chan->channel_type = channel_type; |
4e3c1b9b MD |
713 | list_add(&chan->list, &session->chan); |
714 | mutex_unlock(&sessions_mutex); | |
715 | return chan; | |
716 | ||
f3d01b96 MD |
717 | create_error: |
718 | kfree(chan); | |
c0e31d2e | 719 | nomem: |
a33c9927 MD |
720 | if (transport) |
721 | module_put(transport->owner); | |
c0e31d2e | 722 | notransport: |
e5382b6d | 723 | active: |
4e3c1b9b MD |
724 | mutex_unlock(&sessions_mutex); |
725 | return NULL; | |
726 | } | |
727 | ||
728 | /* | |
d83004aa JD |
729 | * Only used internally at session destruction for per-cpu channels, and |
730 | * when metadata channel is released. | |
731 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 732 | */ |
aa7c23a9 | 733 | static |
a90917c3 | 734 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 735 | { |
11b5a3c2 | 736 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 737 | module_put(chan->transport->owner); |
4e3c1b9b | 738 | list_del(&chan->list); |
8070f5c0 | 739 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
740 | kfree(chan); |
741 | } | |
742 | ||
d83004aa JD |
743 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
744 | { | |
745 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
746 | ||
747 | /* Protect the metadata cache with the sessions_mutex. */ | |
748 | mutex_lock(&sessions_mutex); | |
749 | _lttng_channel_destroy(chan); | |
750 | mutex_unlock(&sessions_mutex); | |
751 | } | |
752 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
753 | ||
754 | static | |
755 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
756 | { | |
757 | stream->finalized = 1; | |
758 | wake_up_interruptible(&stream->read_wait); | |
759 | } | |
760 | ||
e5382b6d MD |
761 | /* |
762 | * Supports event creation while tracing session is active. | |
3c997079 | 763 | * Needs to be called with sessions mutex held. |
e5382b6d | 764 | */ |
3c997079 MD |
765 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
766 | struct lttng_kernel_event *event_param, | |
767 | void *filter, | |
768 | const struct lttng_event_desc *event_desc, | |
769 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 770 | { |
3c997079 | 771 | struct lttng_session *session = chan->session; |
a90917c3 | 772 | struct lttng_event *event; |
3c997079 MD |
773 | const char *event_name; |
774 | struct hlist_head *head; | |
3d084699 | 775 | int ret; |
4e3c1b9b | 776 | |
abc0446a | 777 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 778 | ret = -EMFILE; |
e5382b6d | 779 | goto full; |
abc0446a | 780 | } |
3c997079 MD |
781 | |
782 | switch (itype) { | |
783 | case LTTNG_KERNEL_TRACEPOINT: | |
784 | event_name = event_desc->name; | |
785 | break; | |
786 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 787 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 788 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 789 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 790 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
791 | event_name = event_param->name; |
792 | break; | |
e884017c | 793 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
794 | default: |
795 | WARN_ON_ONCE(1); | |
796 | ret = -EINVAL; | |
797 | goto type_error; | |
798 | } | |
4a11ef1c FD |
799 | |
800 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
801 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 802 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
803 | WARN_ON_ONCE(!event->desc); |
804 | if (!strncmp(event->desc->name, event_name, | |
805 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
806 | && chan == event->chan) { | |
807 | ret = -EEXIST; | |
808 | goto exist; | |
abc0446a MD |
809 | } |
810 | } | |
3c997079 | 811 | |
11b5a3c2 | 812 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 813 | if (!event) { |
4cf0bf51 | 814 | ret = -ENOMEM; |
4e3c1b9b | 815 | goto cache_error; |
abc0446a | 816 | } |
4e3c1b9b MD |
817 | event->chan = chan; |
818 | event->filter = filter; | |
e5382b6d | 819 | event->id = chan->free_event_id++; |
3c997079 MD |
820 | event->instrumentation = itype; |
821 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 822 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
823 | INIT_LIST_HEAD(&event->enablers_ref_head); |
824 | ||
825 | switch (itype) { | |
ab2277d6 | 826 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
827 | /* Event will be enabled by enabler sync. */ |
828 | event->enabled = 0; | |
829 | event->registered = 0; | |
0bcedee9 | 830 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 831 | if (!event->desc) { |
4cf0bf51 | 832 | ret = -ENOENT; |
d3dbe23c | 833 | goto register_error; |
abc0446a | 834 | } |
3c997079 MD |
835 | /* Populate lttng_event structure before event registration. */ |
836 | smp_wmb(); | |
baf20995 | 837 | break; |
ab2277d6 | 838 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
839 | /* |
840 | * Needs to be explicitly enabled after creation, since | |
841 | * we may want to apply filters. | |
842 | */ | |
843 | event->enabled = 0; | |
3c997079 MD |
844 | event->registered = 1; |
845 | /* | |
846 | * Populate lttng_event structure before event | |
847 | * registration. | |
848 | */ | |
849 | smp_wmb(); | |
8bf17deb | 850 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
851 | event_param->u.kprobe.symbol_name, |
852 | event_param->u.kprobe.offset, | |
853 | event_param->u.kprobe.addr, | |
854 | event); | |
abc0446a | 855 | if (ret) { |
4cf0bf51 | 856 | ret = -EINVAL; |
d6d808f3 | 857 | goto register_error; |
abc0446a | 858 | } |
edeb3137 MD |
859 | ret = try_module_get(event->desc->owner); |
860 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 861 | break; |
7371f44c MD |
862 | case LTTNG_KERNEL_KRETPROBE: |
863 | { | |
a90917c3 | 864 | struct lttng_event *event_return; |
7371f44c MD |
865 | |
866 | /* kretprobe defines 2 events */ | |
a0493bef MD |
867 | /* |
868 | * Needs to be explicitly enabled after creation, since | |
869 | * we may want to apply filters. | |
870 | */ | |
871 | event->enabled = 0; | |
3c997079 | 872 | event->registered = 1; |
7371f44c MD |
873 | event_return = |
874 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 875 | if (!event_return) { |
4cf0bf51 | 876 | ret = -ENOMEM; |
7371f44c | 877 | goto register_error; |
abc0446a | 878 | } |
7371f44c MD |
879 | event_return->chan = chan; |
880 | event_return->filter = filter; | |
881 | event_return->id = chan->free_event_id++; | |
a0493bef | 882 | event_return->enabled = 0; |
3c997079 MD |
883 | event_return->registered = 1; |
884 | event_return->instrumentation = itype; | |
7371f44c | 885 | /* |
a90917c3 | 886 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
887 | */ |
888 | smp_wmb(); | |
3c997079 | 889 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
890 | event_param->u.kretprobe.symbol_name, |
891 | event_param->u.kretprobe.offset, | |
892 | event_param->u.kretprobe.addr, | |
893 | event, event_return); | |
894 | if (ret) { | |
895 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 896 | ret = -EINVAL; |
7371f44c MD |
897 | goto register_error; |
898 | } | |
899 | /* Take 2 refs on the module: one per event. */ | |
900 | ret = try_module_get(event->desc->owner); | |
901 | WARN_ON_ONCE(!ret); | |
902 | ret = try_module_get(event->desc->owner); | |
903 | WARN_ON_ONCE(!ret); | |
a90917c3 | 904 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 905 | event_return); |
abc0446a | 906 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
907 | if (ret) { |
908 | kmem_cache_free(event_cache, event_return); | |
909 | module_put(event->desc->owner); | |
910 | module_put(event->desc->owner); | |
911 | goto statedump_error; | |
912 | } | |
913 | list_add(&event_return->list, &chan->session->events); | |
914 | break; | |
915 | } | |
1ec65de1 | 916 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 917 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
918 | /* |
919 | * Needs to be explicitly enabled after creation, since | |
920 | * we may want to apply filters. | |
921 | */ | |
922 | event->enabled = 0; | |
3c997079 MD |
923 | event->registered = 0; |
924 | event->desc = event_desc; | |
badfe9f5 MD |
925 | switch (event_param->u.syscall.entryexit) { |
926 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
927 | ret = -EINVAL; | |
928 | goto register_error; | |
929 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
930 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
931 | break; | |
932 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
933 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
934 | break; | |
935 | } | |
936 | switch (event_param->u.syscall.abi) { | |
937 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
938 | ret = -EINVAL; | |
939 | goto register_error; | |
940 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
941 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
942 | break; | |
943 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
944 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
945 | break; | |
946 | } | |
abc0446a | 947 | if (!event->desc) { |
4cf0bf51 | 948 | ret = -EINVAL; |
259b6cb3 | 949 | goto register_error; |
abc0446a | 950 | } |
1ec65de1 | 951 | break; |
149b9a9d | 952 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
953 | /* |
954 | * Needs to be explicitly enabled after creation, since | |
955 | * we may want to apply filters. | |
956 | */ | |
957 | event->enabled = 0; | |
958 | event->registered = 1; | |
3aed4dca | 959 | |
a344f64b FD |
960 | /* |
961 | * Populate lttng_event structure before event | |
962 | * registration. | |
963 | */ | |
964 | smp_wmb(); | |
149b9a9d | 965 | |
83b802dc | 966 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 967 | event_param->u.uprobe.fd, |
149b9a9d YB |
968 | event); |
969 | if (ret) | |
970 | goto register_error; | |
971 | ret = try_module_get(event->desc->owner); | |
972 | WARN_ON_ONCE(!ret); | |
973 | break; | |
e884017c | 974 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
975 | default: |
976 | WARN_ON_ONCE(1); | |
4cf0bf51 | 977 | ret = -EINVAL; |
df07930b | 978 | goto register_error; |
baf20995 | 979 | } |
a90917c3 | 980 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
981 | WARN_ON_ONCE(ret > 0); |
982 | if (ret) { | |
c099397a | 983 | goto statedump_error; |
abc0446a | 984 | } |
3c997079 | 985 | hlist_add_head(&event->hlist, head); |
dda6a249 | 986 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
987 | return event; |
988 | ||
c099397a | 989 | statedump_error: |
259b6cb3 | 990 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 991 | register_error: |
11b5a3c2 | 992 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
993 | cache_error: |
994 | exist: | |
3c997079 | 995 | type_error: |
e5382b6d | 996 | full: |
4cf0bf51 | 997 | return ERR_PTR(ret); |
4e3c1b9b MD |
998 | } |
999 | ||
dffef45d FD |
1000 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1001 | const struct lttng_event_desc *event_desc, | |
1002 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
1003 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1004 | void *filter, enum lttng_kernel_instrumentation itype) | |
1005 | { | |
1006 | struct lttng_event_notifier *event_notifier; | |
1007 | const char *event_name; | |
1008 | struct hlist_head *head; | |
1009 | int ret; | |
1010 | ||
1011 | switch (itype) { | |
1012 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1013 | event_name = event_desc->name; |
1014 | break; | |
dffef45d | 1015 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1016 | case LTTNG_KERNEL_UPROBE: |
8a8ac9a8 | 1017 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1018 | event_name = event_notifier_param->event.name; |
1019 | break; | |
dffef45d FD |
1020 | case LTTNG_KERNEL_KRETPROBE: |
1021 | case LTTNG_KERNEL_FUNCTION: | |
1022 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1023 | default: |
1024 | WARN_ON_ONCE(1); | |
1025 | ret = -EINVAL; | |
1026 | goto type_error; | |
1027 | } | |
1028 | ||
1029 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1030 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1031 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1032 | WARN_ON_ONCE(!event_notifier->desc); | |
1033 | if (!strncmp(event_notifier->desc->name, event_name, | |
1034 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1035 | && event_notifier_group == event_notifier->group | |
1036 | && token == event_notifier->user_token) { | |
1037 | ret = -EEXIST; | |
1038 | goto exist; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1043 | if (!event_notifier) { | |
1044 | ret = -ENOMEM; | |
1045 | goto cache_error; | |
1046 | } | |
21f58fb7 | 1047 | |
dffef45d FD |
1048 | event_notifier->group = event_notifier_group; |
1049 | event_notifier->user_token = token; | |
1050 | event_notifier->filter = filter; | |
1051 | event_notifier->instrumentation = itype; | |
1052 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1053 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1054 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
dffef45d FD |
1055 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1056 | ||
1057 | switch (itype) { | |
1058 | case LTTNG_KERNEL_TRACEPOINT: | |
1059 | /* Event will be enabled by enabler sync. */ | |
1060 | event_notifier->enabled = 0; | |
1061 | event_notifier->registered = 0; | |
1062 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1063 | if (!event_notifier->desc) { | |
1064 | ret = -ENOENT; | |
1065 | goto register_error; | |
1066 | } | |
1067 | /* Populate lttng_event_notifier structure before event registration. */ | |
1068 | smp_wmb(); | |
1069 | break; | |
1070 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1071 | /* |
1072 | * Needs to be explicitly enabled after creation, since | |
1073 | * we may want to apply filters. | |
1074 | */ | |
1075 | event_notifier->enabled = 0; | |
1076 | event_notifier->registered = 1; | |
1077 | /* | |
1078 | * Populate lttng_event_notifier structure before event | |
1079 | * registration. | |
1080 | */ | |
1081 | smp_wmb(); | |
1082 | ret = lttng_kprobes_register_event_notifier( | |
1083 | event_notifier_param->event.u.kprobe.symbol_name, | |
1084 | event_notifier_param->event.u.kprobe.offset, | |
1085 | event_notifier_param->event.u.kprobe.addr, | |
1086 | event_notifier); | |
1087 | if (ret) { | |
1088 | ret = -EINVAL; | |
1089 | goto register_error; | |
1090 | } | |
1091 | ret = try_module_get(event_notifier->desc->owner); | |
1092 | WARN_ON_ONCE(!ret); | |
1093 | break; | |
8a8ac9a8 FD |
1094 | case LTTNG_KERNEL_NOOP: |
1095 | case LTTNG_KERNEL_SYSCALL: | |
1096 | /* | |
1097 | * Needs to be explicitly enabled after creation, since | |
1098 | * we may want to apply filters. | |
1099 | */ | |
1100 | event_notifier->enabled = 0; | |
1101 | event_notifier->registered = 0; | |
1102 | event_notifier->desc = event_desc; | |
1103 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1104 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1105 | ret = -EINVAL; | |
1106 | goto register_error; | |
1107 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1108 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1109 | break; | |
1110 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1111 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1112 | break; | |
1113 | } | |
1114 | switch (event_notifier_param->event.u.syscall.abi) { | |
1115 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1116 | ret = -EINVAL; | |
1117 | goto register_error; | |
1118 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1119 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1120 | break; | |
1121 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1122 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | if (!event_notifier->desc) { | |
1127 | ret = -EINVAL; | |
1128 | goto register_error; | |
1129 | } | |
1130 | break; | |
dffef45d | 1131 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1132 | /* |
1133 | * Needs to be explicitly enabled after creation, since | |
1134 | * we may want to apply filters. | |
1135 | */ | |
1136 | event_notifier->enabled = 0; | |
1137 | event_notifier->registered = 1; | |
1138 | ||
1139 | /* | |
1140 | * Populate lttng_event_notifier structure before | |
1141 | * event_notifier registration. | |
1142 | */ | |
1143 | smp_wmb(); | |
1144 | ||
1145 | ret = lttng_uprobes_register_event_notifier( | |
1146 | event_notifier_param->event.name, | |
1147 | event_notifier_param->event.u.uprobe.fd, | |
1148 | event_notifier); | |
1149 | if (ret) | |
1150 | goto register_error; | |
1151 | ret = try_module_get(event_notifier->desc->owner); | |
1152 | WARN_ON_ONCE(!ret); | |
1153 | break; | |
dffef45d FD |
1154 | case LTTNG_KERNEL_KRETPROBE: |
1155 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1156 | default: |
1157 | WARN_ON_ONCE(1); | |
1158 | ret = -EINVAL; | |
1159 | goto register_error; | |
1160 | } | |
1161 | ||
1162 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1163 | hlist_add_head(&event_notifier->hlist, head); | |
1164 | return event_notifier; | |
1165 | ||
1166 | register_error: | |
1167 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1168 | cache_error: | |
1169 | exist: | |
1170 | type_error: | |
1171 | return ERR_PTR(ret); | |
1172 | } | |
1173 | ||
3c997079 MD |
1174 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1175 | struct lttng_kernel_event *event_param, | |
1176 | void *filter, | |
1177 | const struct lttng_event_desc *event_desc, | |
1178 | enum lttng_kernel_instrumentation itype) | |
1179 | { | |
1180 | struct lttng_event *event; | |
1181 | ||
1182 | mutex_lock(&sessions_mutex); | |
1183 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1184 | itype); | |
1185 | mutex_unlock(&sessions_mutex); | |
1186 | return event; | |
1187 | } | |
1188 | ||
dffef45d FD |
1189 | struct lttng_event_notifier *lttng_event_notifier_create( |
1190 | const struct lttng_event_desc *event_desc, | |
1191 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1192 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1193 | void *filter, enum lttng_kernel_instrumentation itype) | |
1194 | { | |
1195 | struct lttng_event_notifier *event_notifier; | |
1196 | ||
1197 | mutex_lock(&sessions_mutex); | |
1198 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1199 | event_notifier_group, event_notifier_param, filter, itype); | |
1200 | mutex_unlock(&sessions_mutex); | |
1201 | return event_notifier; | |
1202 | } | |
1203 | ||
3c997079 MD |
1204 | /* Only used for tracepoints for now. */ |
1205 | static | |
1206 | void register_event(struct lttng_event *event) | |
1207 | { | |
1208 | const struct lttng_event_desc *desc; | |
f127e61e | 1209 | int ret = -EINVAL; |
3c997079 | 1210 | |
3c997079 MD |
1211 | if (event->registered) |
1212 | return; | |
4ecb5ad5 | 1213 | |
3c997079 | 1214 | desc = event->desc; |
4ecb5ad5 MD |
1215 | switch (event->instrumentation) { |
1216 | case LTTNG_KERNEL_TRACEPOINT: | |
1217 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1218 | desc->probe_callback, | |
1219 | event); | |
1220 | break; | |
1221 | case LTTNG_KERNEL_SYSCALL: | |
2d6d88c6 | 1222 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1223 | break; |
1224 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1225 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1226 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1227 | case LTTNG_KERNEL_NOOP: |
1228 | ret = 0; | |
1229 | break; | |
e884017c | 1230 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1231 | default: |
1232 | WARN_ON_ONCE(1); | |
1233 | } | |
3c997079 MD |
1234 | if (!ret) |
1235 | event->registered = 1; | |
1236 | } | |
1237 | ||
4e3c1b9b MD |
1238 | /* |
1239 | * Only used internally at session destruction. | |
1240 | */ | |
a90917c3 | 1241 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1242 | { |
4ecb5ad5 | 1243 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1244 | int ret = -EINVAL; |
1245 | ||
3c997079 MD |
1246 | if (!event->registered) |
1247 | return 0; | |
1248 | ||
4ecb5ad5 | 1249 | desc = event->desc; |
38d024ae | 1250 | switch (event->instrumentation) { |
ab2277d6 | 1251 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1252 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1253 | event->desc->probe_callback, |
11b5a3c2 | 1254 | event); |
baf20995 | 1255 | break; |
ab2277d6 | 1256 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1257 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1258 | ret = 0; |
1259 | break; | |
7371f44c MD |
1260 | case LTTNG_KERNEL_KRETPROBE: |
1261 | lttng_kretprobes_unregister(event); | |
1262 | ret = 0; | |
1263 | break; | |
33a39a3c | 1264 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1265 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1266 | break; |
1267 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1268 | ret = 0; |
1269 | break; | |
149b9a9d | 1270 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1271 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1272 | ret = 0; |
1273 | break; | |
e884017c | 1274 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1275 | default: |
1276 | WARN_ON_ONCE(1); | |
1277 | } | |
3c997079 MD |
1278 | if (!ret) |
1279 | event->registered = 0; | |
dda6a249 MD |
1280 | return ret; |
1281 | } | |
1282 | ||
dffef45d FD |
1283 | /* Only used for tracepoints for now. */ |
1284 | static | |
b01155ba | 1285 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1286 | { |
1287 | const struct lttng_event_desc *desc; | |
1288 | int ret = -EINVAL; | |
1289 | ||
1290 | if (event_notifier->registered) | |
1291 | return; | |
1292 | ||
1293 | desc = event_notifier->desc; | |
1294 | switch (event_notifier->instrumentation) { | |
1295 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1296 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1297 | desc->event_notifier_callback, | |
1298 | event_notifier); | |
1299 | break; | |
8a8ac9a8 FD |
1300 | case LTTNG_KERNEL_SYSCALL: |
1301 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1302 | break; | |
dffef45d | 1303 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1304 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1305 | ret = 0; |
1306 | break; | |
dffef45d FD |
1307 | case LTTNG_KERNEL_KRETPROBE: |
1308 | case LTTNG_KERNEL_FUNCTION: | |
1309 | case LTTNG_KERNEL_NOOP: | |
1310 | default: | |
1311 | WARN_ON_ONCE(1); | |
1312 | } | |
1313 | if (!ret) | |
1314 | event_notifier->registered = 1; | |
1315 | } | |
1316 | ||
1317 | static | |
1318 | int _lttng_event_notifier_unregister( | |
1319 | struct lttng_event_notifier *event_notifier) | |
1320 | { | |
1321 | const struct lttng_event_desc *desc; | |
1322 | int ret = -EINVAL; | |
1323 | ||
1324 | if (!event_notifier->registered) | |
1325 | return 0; | |
1326 | ||
1327 | desc = event_notifier->desc; | |
1328 | switch (event_notifier->instrumentation) { | |
1329 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1330 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1331 | event_notifier->desc->event_notifier_callback, | |
1332 | event_notifier); | |
1333 | break; | |
dffef45d | 1334 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1335 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1336 | ret = 0; | |
1337 | break; | |
9de67196 FD |
1338 | case LTTNG_KERNEL_UPROBE: |
1339 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1340 | ret = 0; | |
1341 | break; | |
8a8ac9a8 FD |
1342 | case LTTNG_KERNEL_SYSCALL: |
1343 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1344 | break; | |
dffef45d FD |
1345 | case LTTNG_KERNEL_KRETPROBE: |
1346 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1347 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1348 | default: |
1349 | WARN_ON_ONCE(1); | |
1350 | } | |
1351 | if (!ret) | |
1352 | event_notifier->registered = 0; | |
1353 | return ret; | |
1354 | } | |
1355 | ||
dda6a249 MD |
1356 | /* |
1357 | * Only used internally at session destruction. | |
1358 | */ | |
be066e6c | 1359 | static |
a90917c3 | 1360 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1361 | { |
edeb3137 MD |
1362 | switch (event->instrumentation) { |
1363 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1364 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1365 | break; |
1366 | case LTTNG_KERNEL_KPROBE: | |
1367 | module_put(event->desc->owner); | |
8bf17deb | 1368 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1369 | break; |
7371f44c MD |
1370 | case LTTNG_KERNEL_KRETPROBE: |
1371 | module_put(event->desc->owner); | |
1372 | lttng_kretprobes_destroy_private(event); | |
1373 | break; | |
259b6cb3 | 1374 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1375 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1376 | break; |
149b9a9d YB |
1377 | case LTTNG_KERNEL_UPROBE: |
1378 | module_put(event->desc->owner); | |
83b802dc | 1379 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1380 | break; |
e884017c | 1381 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1382 | default: |
1383 | WARN_ON_ONCE(1); | |
1384 | } | |
dda6a249 | 1385 | list_del(&event->list); |
8070f5c0 | 1386 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1387 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1388 | } |
1389 | ||
dffef45d FD |
1390 | /* |
1391 | * Only used internally at session destruction. | |
1392 | */ | |
1393 | static | |
1394 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1395 | { | |
1396 | switch (event_notifier->instrumentation) { | |
1397 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1398 | lttng_event_desc_put(event_notifier->desc); |
1399 | break; | |
dffef45d | 1400 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1401 | module_put(event_notifier->desc->owner); |
1402 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1403 | break; | |
8a8ac9a8 FD |
1404 | case LTTNG_KERNEL_NOOP: |
1405 | case LTTNG_KERNEL_SYSCALL: | |
1406 | break; | |
9de67196 FD |
1407 | case LTTNG_KERNEL_UPROBE: |
1408 | module_put(event_notifier->desc->owner); | |
1409 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1410 | break; | |
dffef45d FD |
1411 | case LTTNG_KERNEL_KRETPROBE: |
1412 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1413 | default: |
1414 | WARN_ON_ONCE(1); | |
1415 | } | |
1416 | list_del(&event_notifier->list); | |
1417 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1418 | } | |
1419 | ||
d1f652f8 MD |
1420 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1421 | enum tracker_type tracker_type) | |
e0130fab | 1422 | { |
d1f652f8 MD |
1423 | switch (tracker_type) { |
1424 | case TRACKER_PID: | |
1425 | return &session->pid_tracker; | |
1426 | case TRACKER_VPID: | |
1427 | return &session->vpid_tracker; | |
1428 | case TRACKER_UID: | |
1429 | return &session->uid_tracker; | |
1430 | case TRACKER_VUID: | |
1431 | return &session->vuid_tracker; | |
1432 | case TRACKER_GID: | |
1433 | return &session->gid_tracker; | |
1434 | case TRACKER_VGID: | |
1435 | return &session->vgid_tracker; | |
1436 | default: | |
1437 | WARN_ON_ONCE(1); | |
1438 | return NULL; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | int lttng_session_track_id(struct lttng_session *session, | |
1443 | enum tracker_type tracker_type, int id) | |
1444 | { | |
1445 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1446 | int ret; |
1447 | ||
d1f652f8 MD |
1448 | tracker = get_tracker(session, tracker_type); |
1449 | if (!tracker) | |
1450 | return -EINVAL; | |
1451 | if (id < -1) | |
e0130fab MD |
1452 | return -EINVAL; |
1453 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1454 | if (id == -1) { |
1455 | /* track all ids: destroy tracker. */ | |
1456 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1457 | ret = 0; |
1458 | } else { | |
d1f652f8 | 1459 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1460 | } |
e0130fab MD |
1461 | mutex_unlock(&sessions_mutex); |
1462 | return ret; | |
1463 | } | |
1464 | ||
d1f652f8 MD |
1465 | int lttng_session_untrack_id(struct lttng_session *session, |
1466 | enum tracker_type tracker_type, int id) | |
e0130fab | 1467 | { |
d1f652f8 | 1468 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1469 | int ret; |
1470 | ||
d1f652f8 MD |
1471 | tracker = get_tracker(session, tracker_type); |
1472 | if (!tracker) | |
1473 | return -EINVAL; | |
1474 | if (id < -1) | |
e0130fab MD |
1475 | return -EINVAL; |
1476 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1477 | if (id == -1) { |
1478 | /* untrack all ids: replace by empty tracker. */ | |
1479 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1480 | } else { |
d1f652f8 | 1481 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1482 | } |
e0130fab MD |
1483 | mutex_unlock(&sessions_mutex); |
1484 | return ret; | |
1485 | } | |
1486 | ||
7e6f9ef6 | 1487 | static |
d1f652f8 | 1488 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1489 | { |
d1f652f8 MD |
1490 | struct lttng_id_tracker *id_tracker = m->private; |
1491 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1492 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1493 | int iter = 0, i; |
1494 | ||
1495 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1496 | if (id_tracker_p) { |
1497 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1498 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1499 | |
f934e302 | 1500 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1501 | if (iter++ >= *pos) |
1502 | return e; | |
1503 | } | |
1504 | } | |
1505 | } else { | |
d1f652f8 | 1506 | /* ID tracker disabled. */ |
7e6f9ef6 | 1507 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1508 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1509 | } |
1510 | iter++; | |
1511 | } | |
1512 | /* End of list */ | |
1513 | return NULL; | |
1514 | } | |
1515 | ||
1516 | /* Called with sessions_mutex held. */ | |
1517 | static | |
d1f652f8 | 1518 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1519 | { |
d1f652f8 MD |
1520 | struct lttng_id_tracker *id_tracker = m->private; |
1521 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1522 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1523 | int iter = 0, i; |
1524 | ||
1525 | (*ppos)++; | |
d1f652f8 MD |
1526 | if (id_tracker_p) { |
1527 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1528 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1529 | |
f934e302 | 1530 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1531 | if (iter++ >= *ppos) |
1532 | return e; | |
1533 | } | |
1534 | } | |
1535 | } else { | |
d1f652f8 | 1536 | /* ID tracker disabled. */ |
7e6f9ef6 | 1537 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1538 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1539 | iter++; |
1540 | } | |
1541 | ||
1542 | /* End of list */ | |
1543 | return NULL; | |
1544 | } | |
1545 | ||
1546 | static | |
d1f652f8 | 1547 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1548 | { |
1549 | mutex_unlock(&sessions_mutex); | |
1550 | } | |
1551 | ||
1552 | static | |
d1f652f8 | 1553 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1554 | { |
d1f652f8 MD |
1555 | struct lttng_id_tracker *id_tracker = m->private; |
1556 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1557 | int id; | |
7e6f9ef6 | 1558 | |
d1f652f8 | 1559 | if (p == id_tracker_p) { |
7e6f9ef6 | 1560 | /* Tracker disabled. */ |
d1f652f8 | 1561 | id = -1; |
7e6f9ef6 | 1562 | } else { |
d1f652f8 | 1563 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1564 | |
d1f652f8 MD |
1565 | id = lttng_id_tracker_get_node_id(e); |
1566 | } | |
1567 | switch (id_tracker->tracker_type) { | |
1568 | case TRACKER_PID: | |
1569 | seq_printf(m, "process { pid = %d; };\n", id); | |
1570 | break; | |
1571 | case TRACKER_VPID: | |
1572 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1573 | break; | |
1574 | case TRACKER_UID: | |
1575 | seq_printf(m, "user { uid = %d; };\n", id); | |
1576 | break; | |
1577 | case TRACKER_VUID: | |
1578 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1579 | break; | |
1580 | case TRACKER_GID: | |
1581 | seq_printf(m, "group { gid = %d; };\n", id); | |
1582 | break; | |
1583 | case TRACKER_VGID: | |
1584 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1585 | break; | |
1586 | default: | |
1587 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1588 | } |
7e6f9ef6 MD |
1589 | return 0; |
1590 | } | |
1591 | ||
1592 | static | |
d1f652f8 MD |
1593 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1594 | .start = id_list_start, | |
1595 | .next = id_list_next, | |
1596 | .stop = id_list_stop, | |
1597 | .show = id_list_show, | |
7e6f9ef6 MD |
1598 | }; |
1599 | ||
1600 | static | |
d1f652f8 | 1601 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1602 | { |
d1f652f8 | 1603 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1604 | } |
1605 | ||
1606 | static | |
d1f652f8 | 1607 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1608 | { |
1609 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1610 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1611 | int ret; |
1612 | ||
d1f652f8 | 1613 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1614 | ret = seq_release(inode, file); |
d1f652f8 MD |
1615 | if (!ret) |
1616 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1617 | return ret; |
1618 | } | |
1619 | ||
d1f652f8 | 1620 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1621 | .owner = THIS_MODULE, |
d1f652f8 | 1622 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1623 | .read = seq_read, |
1624 | .llseek = seq_lseek, | |
d1f652f8 | 1625 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1626 | }; |
1627 | ||
d1f652f8 MD |
1628 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1629 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1630 | { |
d1f652f8 | 1631 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1632 | struct seq_file *m; |
1633 | int file_fd, ret; | |
1634 | ||
1635 | file_fd = lttng_get_unused_fd(); | |
1636 | if (file_fd < 0) { | |
1637 | ret = file_fd; | |
1638 | goto fd_error; | |
1639 | } | |
1640 | ||
d1f652f8 MD |
1641 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1642 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1643 | NULL, O_RDWR); |
d1f652f8 MD |
1644 | if (IS_ERR(tracker_ids_list_file)) { |
1645 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1646 | goto file_error; |
1647 | } | |
98d7281c MJ |
1648 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1649 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1650 | goto refcount_error; |
1651 | } | |
d1f652f8 | 1652 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1653 | if (ret < 0) |
1654 | goto open_error; | |
d1f652f8 MD |
1655 | m = tracker_ids_list_file->private_data; |
1656 | ||
1657 | m->private = get_tracker(session, tracker_type); | |
1658 | BUG_ON(!m->private); | |
1659 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1660 | |
1661 | return file_fd; | |
1662 | ||
1663 | open_error: | |
9c1f4643 MD |
1664 | atomic_long_dec(&session->file->f_count); |
1665 | refcount_error: | |
d1f652f8 | 1666 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1667 | file_error: |
1668 | put_unused_fd(file_fd); | |
1669 | fd_error: | |
1670 | return ret; | |
1671 | } | |
1672 | ||
3c997079 MD |
1673 | /* |
1674 | * Enabler management. | |
1675 | */ | |
1676 | static | |
4993071a PP |
1677 | int lttng_match_enabler_star_glob(const char *desc_name, |
1678 | const char *pattern) | |
3c997079 | 1679 | { |
cbc19040 MD |
1680 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1681 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1682 | return 0; |
1683 | return 1; | |
1684 | } | |
1685 | ||
1686 | static | |
4ecb5ad5 MD |
1687 | int lttng_match_enabler_name(const char *desc_name, |
1688 | const char *name) | |
3c997079 | 1689 | { |
4ecb5ad5 | 1690 | if (strcmp(desc_name, name)) |
3c997079 MD |
1691 | return 0; |
1692 | return 1; | |
1693 | } | |
1694 | ||
3c997079 MD |
1695 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1696 | struct lttng_enabler *enabler) | |
1697 | { | |
4ecb5ad5 | 1698 | const char *desc_name, *enabler_name; |
badfe9f5 | 1699 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1700 | |
1701 | enabler_name = enabler->event_param.name; | |
1702 | switch (enabler->event_param.instrumentation) { | |
1703 | case LTTNG_KERNEL_TRACEPOINT: | |
1704 | desc_name = desc->name; | |
3b861b22 FD |
1705 | switch (enabler->format_type) { |
1706 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1707 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1708 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1709 | return lttng_match_enabler_name(desc_name, enabler_name); |
1710 | default: | |
1711 | return -EINVAL; | |
1712 | } | |
4ecb5ad5 MD |
1713 | break; |
1714 | case LTTNG_KERNEL_SYSCALL: | |
1715 | desc_name = desc->name; | |
badfe9f5 | 1716 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1717 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1718 | compat = true; |
1719 | } | |
4ecb5ad5 MD |
1720 | if (!strncmp(desc_name, "syscall_exit_", |
1721 | strlen("syscall_exit_"))) { | |
1722 | desc_name += strlen("syscall_exit_"); | |
1723 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1724 | strlen("syscall_entry_"))) { | |
1725 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1726 | entry = true; |
4ecb5ad5 MD |
1727 | } else { |
1728 | WARN_ON_ONCE(1); | |
1729 | return -EINVAL; | |
1730 | } | |
badfe9f5 MD |
1731 | switch (enabler->event_param.u.syscall.entryexit) { |
1732 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1733 | break; | |
1734 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1735 | if (!entry) | |
1736 | return 0; | |
1737 | break; | |
1738 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1739 | if (entry) | |
1740 | return 0; | |
1741 | break; | |
1742 | default: | |
1743 | return -EINVAL; | |
1744 | } | |
1745 | switch (enabler->event_param.u.syscall.abi) { | |
1746 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1747 | break; | |
1748 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1749 | if (compat) | |
1750 | return 0; | |
1751 | break; | |
1752 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1753 | if (!compat) | |
1754 | return 0; | |
1755 | break; | |
1756 | default: | |
1757 | return -EINVAL; | |
1758 | } | |
1759 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1760 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1761 | switch (enabler->format_type) { |
1762 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1763 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1764 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1765 | return lttng_match_enabler_name(desc_name, enabler_name); |
1766 | default: | |
1767 | return -EINVAL; | |
1768 | } | |
1769 | break; | |
cff6938b | 1770 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1771 | return -EINVAL; /* Not implemented. */ |
1772 | default: | |
1773 | return -EINVAL; | |
1774 | } | |
4ecb5ad5 MD |
1775 | break; |
1776 | default: | |
1777 | WARN_ON_ONCE(1); | |
1778 | return -EINVAL; | |
1779 | } | |
3c997079 MD |
1780 | } |
1781 | ||
1782 | static | |
b2bc0bc8 FD |
1783 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1784 | struct lttng_event *event) | |
3c997079 | 1785 | { |
b2bc0bc8 FD |
1786 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1787 | event_enabler); | |
1788 | ||
1789 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1790 | return 0; |
b2bc0bc8 FD |
1791 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1792 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1793 | return 1; |
1794 | else | |
1795 | return 0; | |
1796 | } | |
1797 | ||
b01155ba FD |
1798 | static |
1799 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1800 | struct lttng_event_notifier *event_notifier) | |
1801 | { | |
1802 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1803 | event_notifier_enabler); | |
1804 | ||
1805 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1806 | return 0; | |
1807 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1808 | && event_notifier->group == event_notifier_enabler->group | |
1809 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1810 | return 1; | |
1811 | else | |
1812 | return 0; | |
1813 | } | |
1814 | ||
3c997079 | 1815 | static |
b2bc0bc8 FD |
1816 | struct lttng_enabler_ref *lttng_enabler_ref( |
1817 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1818 | struct lttng_enabler *enabler) |
1819 | { | |
1820 | struct lttng_enabler_ref *enabler_ref; | |
1821 | ||
b2bc0bc8 | 1822 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1823 | if (enabler_ref->ref == enabler) |
1824 | return enabler_ref; | |
1825 | } | |
1826 | return NULL; | |
1827 | } | |
1828 | ||
3c997079 | 1829 | static |
1b917d6b | 1830 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1831 | { |
b2bc0bc8 | 1832 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1833 | struct lttng_probe_desc *probe_desc; |
1834 | const struct lttng_event_desc *desc; | |
1835 | int i; | |
1836 | struct list_head *probe_list; | |
1837 | ||
1838 | probe_list = lttng_get_probe_list_head(); | |
1839 | /* | |
1840 | * For each probe event, if we find that a probe event matches | |
1841 | * our enabler, create an associated lttng_event if not | |
1842 | * already present. | |
1843 | */ | |
1844 | list_for_each_entry(probe_desc, probe_list, head) { | |
1845 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1846 | int found = 0; | |
1847 | struct hlist_head *head; | |
3c997079 MD |
1848 | struct lttng_event *event; |
1849 | ||
1850 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1851 | if (!lttng_desc_match_enabler(desc, |
1852 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1853 | continue; |
3c997079 MD |
1854 | |
1855 | /* | |
1856 | * Check if already created. | |
1857 | */ | |
4a11ef1c FD |
1858 | head = utils_borrow_hash_table_bucket( |
1859 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1860 | desc->name); | |
d216ecae | 1861 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1862 | if (event->desc == desc |
b2bc0bc8 | 1863 | && event->chan == event_enabler->chan) |
3c997079 MD |
1864 | found = 1; |
1865 | } | |
1866 | if (found) | |
1867 | continue; | |
1868 | ||
1869 | /* | |
1870 | * We need to create an event for this | |
1871 | * event probe. | |
1872 | */ | |
b2bc0bc8 | 1873 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1874 | NULL, NULL, desc, |
1875 | LTTNG_KERNEL_TRACEPOINT); | |
1876 | if (!event) { | |
5a15f70c | 1877 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1878 | probe_desc->event_desc[i]->name); |
1879 | } | |
1880 | } | |
1881 | } | |
1882 | } | |
1883 | ||
b01155ba FD |
1884 | static |
1885 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1886 | { | |
1887 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1888 | struct lttng_probe_desc *probe_desc; | |
1889 | const struct lttng_event_desc *desc; | |
1890 | int i; | |
1891 | struct list_head *probe_list; | |
1892 | ||
1893 | probe_list = lttng_get_probe_list_head(); | |
1894 | /* | |
1895 | * For each probe event, if we find that a probe event matches | |
1896 | * our enabler, create an associated lttng_event_notifier if not | |
1897 | * already present. | |
1898 | */ | |
1899 | list_for_each_entry(probe_desc, probe_list, head) { | |
1900 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1901 | int found = 0; | |
1902 | struct hlist_head *head; | |
1903 | struct lttng_event_notifier *event_notifier; | |
1904 | ||
1905 | desc = probe_desc->event_desc[i]; | |
1906 | if (!lttng_desc_match_enabler(desc, | |
1907 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1908 | continue; | |
1909 | ||
1910 | /* | |
1911 | * Check if already created. | |
1912 | */ | |
1913 | head = utils_borrow_hash_table_bucket( | |
1914 | event_notifier_group->event_notifiers_ht.table, | |
1915 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1916 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1917 | if (event_notifier->desc == desc | |
1918 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1919 | found = 1; | |
1920 | } | |
1921 | if (found) | |
1922 | continue; | |
1923 | ||
1924 | /* | |
1925 | * We need to create a event_notifier for this event probe. | |
1926 | */ | |
1927 | event_notifier = _lttng_event_notifier_create(desc, | |
1928 | event_notifier_enabler->base.user_token, | |
1929 | event_notifier_group, NULL, NULL, | |
1930 | LTTNG_KERNEL_TRACEPOINT); | |
1931 | if (IS_ERR(event_notifier)) { | |
1932 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1933 | probe_desc->event_desc[i]->name); | |
1934 | } | |
1935 | } | |
1936 | } | |
1937 | } | |
1938 | ||
33a39a3c | 1939 | static |
1b917d6b | 1940 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1941 | { |
1942 | int ret; | |
1943 | ||
2d6d88c6 | 1944 | ret = lttng_syscalls_register_event(event_enabler->chan, NULL); |
33a39a3c MD |
1945 | WARN_ON_ONCE(ret); |
1946 | } | |
1947 | ||
8a8ac9a8 FD |
1948 | static |
1949 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1950 | { | |
1951 | int ret; | |
1952 | ||
1953 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
1954 | WARN_ON_ONCE(ret); | |
1955 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
1956 | WARN_ON_ONCE(ret); | |
1957 | } | |
1958 | ||
33a39a3c MD |
1959 | /* |
1960 | * Create struct lttng_event if it is missing and present in the list of | |
1961 | * tracepoint probes. | |
1962 | * Should be called with sessions mutex held. | |
1963 | */ | |
1964 | static | |
b2bc0bc8 | 1965 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1966 | { |
b2bc0bc8 | 1967 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1968 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1969 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1970 | break; |
1971 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1972 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1973 | break; |
1974 | default: | |
1975 | WARN_ON_ONCE(1); | |
1976 | break; | |
1977 | } | |
1978 | } | |
1979 | ||
3c997079 | 1980 | /* |
b2bc0bc8 | 1981 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1982 | * and add backward reference from the event to the enabler. |
1983 | * Should be called with sessions mutex held. | |
1984 | */ | |
1985 | static | |
b2bc0bc8 | 1986 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1987 | { |
b2bc0bc8 FD |
1988 | struct lttng_channel *chan = event_enabler->chan; |
1989 | struct lttng_session *session = event_enabler->chan->session; | |
1990 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1991 | struct lttng_event *event; |
1992 | ||
b2bc0bc8 FD |
1993 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1994 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1995 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
cff6938b | 1996 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 FD |
1997 | !strcmp(base_enabler->event_param.name, "*")) { |
1998 | if (base_enabler->enabled) | |
badfe9f5 MD |
1999 | WRITE_ONCE(chan->syscall_all, 1); |
2000 | else | |
2001 | WRITE_ONCE(chan->syscall_all, 0); | |
2002 | } | |
2003 | ||
3c997079 | 2004 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2005 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2006 | |
b2bc0bc8 | 2007 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2008 | list_for_each_entry(event, &session->events, list) { |
2009 | struct lttng_enabler_ref *enabler_ref; | |
2010 | ||
b2bc0bc8 | 2011 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2012 | continue; |
b2bc0bc8 FD |
2013 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2014 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2015 | if (!enabler_ref) { |
2016 | /* | |
2017 | * If no backward ref, create it. | |
b2bc0bc8 | 2018 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2019 | */ |
2020 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2021 | if (!enabler_ref) | |
2022 | return -ENOMEM; | |
b2bc0bc8 | 2023 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2024 | list_add(&enabler_ref->node, |
2025 | &event->enablers_ref_head); | |
2026 | } | |
2027 | ||
f127e61e MD |
2028 | /* |
2029 | * Link filter bytecodes if not linked yet. | |
2030 | */ | |
2dfda770 FD |
2031 | lttng_enabler_link_bytecode(event->desc, |
2032 | lttng_static_ctx, | |
183e8b3a | 2033 | &event->filter_bytecode_runtime_head, |
2dfda770 | 2034 | lttng_event_enabler_as_enabler(event_enabler)); |
f127e61e | 2035 | |
3c997079 MD |
2036 | /* TODO: merge event context. */ |
2037 | } | |
2038 | return 0; | |
2039 | } | |
2040 | ||
b01155ba FD |
2041 | /* |
2042 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2043 | * tracepoint probes. | |
2044 | * Should be called with sessions mutex held. | |
2045 | */ | |
2046 | static | |
2047 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2048 | { | |
2049 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2050 | case LTTNG_KERNEL_TRACEPOINT: | |
2051 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2052 | break; | |
8a8ac9a8 FD |
2053 | case LTTNG_KERNEL_SYSCALL: |
2054 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2055 | break; | |
b01155ba FD |
2056 | default: |
2057 | WARN_ON_ONCE(1); | |
2058 | break; | |
2059 | } | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2064 | */ | |
2065 | static | |
8a8ac9a8 FD |
2066 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2067 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2068 | { |
2069 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2070 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2071 | struct lttng_event_notifier *event_notifier; |
2072 | ||
8a8ac9a8 FD |
2073 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2074 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2075 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2076 | !strcmp(base_enabler->event_param.name, "*")) { | |
2077 | ||
2078 | int enabled = base_enabler->enabled; | |
2079 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2080 | ||
2081 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2082 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2083 | ||
2084 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2085 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2086 | ||
2087 | } | |
2088 | ||
b01155ba FD |
2089 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2090 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2091 | ||
2092 | /* Link the created event_notifier with its associated enabler. */ | |
2093 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2094 | struct lttng_enabler_ref *enabler_ref; | |
2095 | ||
2096 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2097 | continue; | |
2098 | ||
2099 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2100 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2101 | if (!enabler_ref) { | |
2102 | /* | |
2103 | * If no backward ref, create it. | |
2104 | * Add backward ref from event_notifier to enabler. | |
2105 | */ | |
2106 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2107 | if (!enabler_ref) | |
2108 | return -ENOMEM; | |
2109 | ||
2110 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2111 | event_notifier_enabler); | |
2112 | list_add(&enabler_ref->node, | |
2113 | &event_notifier->enablers_ref_head); | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * Link filter bytecodes if not linked yet. | |
2118 | */ | |
2119 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2120 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
b01155ba FD |
2121 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2122 | } | |
2123 | return 0; | |
2124 | } | |
2125 | ||
3c997079 MD |
2126 | /* |
2127 | * Called at module load: connect the probe on all enablers matching | |
2128 | * this event. | |
2129 | * Called with sessions lock held. | |
2130 | */ | |
2131 | int lttng_fix_pending_events(void) | |
2132 | { | |
2133 | struct lttng_session *session; | |
2134 | ||
2135 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2136 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2137 | return 0; |
2138 | } | |
2139 | ||
b01155ba FD |
2140 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2141 | struct lttng_event_notifier_group *event_notifier_group) | |
2142 | { | |
2143 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2144 | ||
2145 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2146 | node) { | |
2147 | if (event_notifier_enabler->base.enabled) | |
2148 | return true; | |
2149 | } | |
2150 | return false; | |
2151 | } | |
2152 | ||
2153 | bool lttng_event_notifier_active(void) | |
2154 | { | |
2155 | struct lttng_event_notifier_group *event_notifier_group; | |
2156 | ||
2157 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2158 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2159 | return true; | |
2160 | } | |
2161 | return false; | |
2162 | } | |
2163 | ||
2164 | int lttng_fix_pending_event_notifiers(void) | |
2165 | { | |
2166 | struct lttng_event_notifier_group *event_notifier_group; | |
2167 | ||
2168 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2169 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2170 | return 0; | |
2171 | } | |
2172 | ||
b2bc0bc8 FD |
2173 | struct lttng_event_enabler *lttng_event_enabler_create( |
2174 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2175 | struct lttng_kernel_event *event_param, |
2176 | struct lttng_channel *chan) | |
2177 | { | |
b2bc0bc8 | 2178 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2179 | |
b2bc0bc8 FD |
2180 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2181 | if (!event_enabler) | |
3c997079 | 2182 | return NULL; |
b2bc0bc8 FD |
2183 | event_enabler->base.format_type = format_type; |
2184 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2185 | memcpy(&event_enabler->base.event_param, event_param, | |
2186 | sizeof(event_enabler->base.event_param)); | |
2187 | event_enabler->chan = chan; | |
3c997079 | 2188 | /* ctx left NULL */ |
b2bc0bc8 FD |
2189 | event_enabler->base.enabled = 0; |
2190 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2191 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2192 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2193 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2194 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2195 | return event_enabler; |
3c997079 MD |
2196 | } |
2197 | ||
b2bc0bc8 | 2198 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2199 | { |
2200 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2201 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2202 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2203 | mutex_unlock(&sessions_mutex); |
2204 | return 0; | |
2205 | } | |
2206 | ||
b2bc0bc8 | 2207 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2208 | { |
2209 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2210 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2211 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2212 | mutex_unlock(&sessions_mutex); |
2213 | return 0; | |
2214 | } | |
2215 | ||
b2bc0bc8 | 2216 | static |
183e8b3a | 2217 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2218 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2219 | { | |
2220 | struct lttng_filter_bytecode_node *bytecode_node; | |
2221 | uint32_t bytecode_len; | |
2222 | int ret; | |
2223 | ||
2224 | ret = get_user(bytecode_len, &bytecode->len); | |
2225 | if (ret) | |
2226 | return ret; | |
2227 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2228 | GFP_KERNEL); | |
2229 | if (!bytecode_node) | |
2230 | return -ENOMEM; | |
2231 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2232 | sizeof(*bytecode) + bytecode_len); | |
2233 | if (ret) | |
2234 | goto error_free; | |
b2bc0bc8 | 2235 | |
07dfc1d0 MD |
2236 | bytecode_node->enabler = enabler; |
2237 | /* Enforce length based on allocated size */ | |
2238 | bytecode_node->bc.len = bytecode_len; | |
2239 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2240 | |
07dfc1d0 MD |
2241 | return 0; |
2242 | ||
2243 | error_free: | |
2244 | kfree(bytecode_node); | |
2245 | return ret; | |
2246 | } | |
2247 | ||
183e8b3a | 2248 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2249 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2250 | { | |
2251 | int ret; | |
183e8b3a | 2252 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2253 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2254 | if (ret) | |
2255 | goto error; | |
2256 | ||
2257 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2258 | return 0; | |
2259 | ||
2260 | error: | |
2261 | return ret; | |
2262 | } | |
2263 | ||
3aed4dca FD |
2264 | int lttng_event_add_callsite(struct lttng_event *event, |
2265 | struct lttng_kernel_event_callsite __user *callsite) | |
2266 | { | |
2267 | ||
2268 | switch (event->instrumentation) { | |
2269 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2270 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2271 | default: |
2272 | return -EINVAL; | |
2273 | } | |
2274 | } | |
2275 | ||
b2bc0bc8 | 2276 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2277 | struct lttng_kernel_context *context_param) |
2278 | { | |
2279 | return -ENOSYS; | |
2280 | } | |
2281 | ||
2282 | static | |
2283 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2284 | { | |
07dfc1d0 MD |
2285 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
2286 | ||
2287 | /* Destroy filter bytecode */ | |
2288 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2289 | &enabler->filter_bytecode_head, node) { | |
2290 | kfree(filter_node); | |
2291 | } | |
b2bc0bc8 FD |
2292 | } |
2293 | ||
2294 | static | |
2295 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2296 | { | |
2297 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2298 | |
3c997079 | 2299 | /* Destroy contexts */ |
b2bc0bc8 | 2300 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2301 | |
b2bc0bc8 FD |
2302 | list_del(&event_enabler->node); |
2303 | kfree(event_enabler); | |
3c997079 MD |
2304 | } |
2305 | ||
dffef45d FD |
2306 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2307 | struct lttng_event_notifier_group *event_notifier_group, | |
2308 | enum lttng_enabler_format_type format_type, | |
2309 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2310 | { | |
2311 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2312 | ||
2313 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2314 | if (!event_notifier_enabler) | |
2315 | return NULL; | |
2316 | ||
2317 | event_notifier_enabler->base.format_type = format_type; | |
2318 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
2319 | ||
8a8ac9a8 FD |
2320 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2321 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2322 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2323 | ||
2324 | event_notifier_enabler->base.enabled = 0; | |
2325 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2326 | event_notifier_enabler->group = event_notifier_group; | |
2327 | ||
2328 | mutex_lock(&sessions_mutex); | |
2329 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2330 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2331 | |
2332 | mutex_unlock(&sessions_mutex); | |
2333 | ||
2334 | return event_notifier_enabler; | |
2335 | } | |
2336 | ||
2337 | int lttng_event_notifier_enabler_enable( | |
2338 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2339 | { | |
2340 | mutex_lock(&sessions_mutex); | |
2341 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2342 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2343 | mutex_unlock(&sessions_mutex); |
2344 | return 0; | |
2345 | } | |
2346 | ||
2347 | int lttng_event_notifier_enabler_disable( | |
2348 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2349 | { | |
2350 | mutex_lock(&sessions_mutex); | |
2351 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2352 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2353 | mutex_unlock(&sessions_mutex); |
2354 | return 0; | |
2355 | } | |
2356 | ||
183e8b3a | 2357 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2358 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2359 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2360 | { | |
2361 | int ret; | |
2362 | ||
183e8b3a | 2363 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2364 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2365 | bytecode); | |
2366 | if (ret) | |
2367 | goto error; | |
2368 | ||
b01155ba | 2369 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2370 | return 0; |
2371 | ||
2372 | error: | |
2373 | return ret; | |
2374 | } | |
2375 | ||
9de67196 FD |
2376 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2377 | struct lttng_kernel_event_callsite __user *callsite) | |
2378 | { | |
2379 | ||
2380 | switch (event_notifier->instrumentation) { | |
2381 | case LTTNG_KERNEL_UPROBE: | |
2382 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2383 | callsite); | |
2384 | default: | |
2385 | return -EINVAL; | |
2386 | } | |
2387 | } | |
2388 | ||
dffef45d FD |
2389 | int lttng_event_notifier_enabler_attach_context( |
2390 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2391 | struct lttng_kernel_context *context_param) | |
2392 | { | |
2393 | return -ENOSYS; | |
2394 | } | |
2395 | ||
2396 | static | |
2397 | void lttng_event_notifier_enabler_destroy( | |
2398 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2399 | { | |
2400 | if (!event_notifier_enabler) { | |
2401 | return; | |
2402 | } | |
2403 | ||
2404 | list_del(&event_notifier_enabler->node); | |
2405 | ||
2406 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2407 | kfree(event_notifier_enabler); | |
2408 | } | |
2409 | ||
3c997079 | 2410 | /* |
b2bc0bc8 | 2411 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2412 | * session. |
2413 | * Should be called with sessions mutex held. | |
2414 | */ | |
2415 | static | |
b2bc0bc8 | 2416 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2417 | { |
b2bc0bc8 | 2418 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2419 | struct lttng_event *event; |
2420 | ||
b2bc0bc8 FD |
2421 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2422 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2423 | /* |
2424 | * For each event, if at least one of its enablers is enabled, | |
2425 | * and its channel and session transient states are enabled, we | |
2426 | * enable the event, else we disable it. | |
2427 | */ | |
2428 | list_for_each_entry(event, &session->events, list) { | |
2429 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2430 | struct lttng_bytecode_runtime *runtime; |
2431 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2432 | |
4ecb5ad5 MD |
2433 | switch (event->instrumentation) { |
2434 | case LTTNG_KERNEL_TRACEPOINT: | |
2435 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2436 | /* Enable events */ |
2437 | list_for_each_entry(enabler_ref, | |
2438 | &event->enablers_ref_head, node) { | |
2439 | if (enabler_ref->ref->enabled) { | |
2440 | enabled = 1; | |
2441 | break; | |
2442 | } | |
2443 | } | |
4ecb5ad5 MD |
2444 | break; |
2445 | default: | |
3c997079 MD |
2446 | /* Not handled with lazy sync. */ |
2447 | continue; | |
2448 | } | |
2449 | /* | |
2450 | * Enabled state is based on union of enablers, with | |
2451 | * intesection of session and channel transient enable | |
2452 | * states. | |
2453 | */ | |
2454 | enabled = enabled && session->tstate && event->chan->tstate; | |
2455 | ||
a8f2d0c7 | 2456 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2457 | /* |
2458 | * Sync tracepoint registration with event enabled | |
2459 | * state. | |
2460 | */ | |
2461 | if (enabled) { | |
2462 | register_event(event); | |
2463 | } else { | |
2464 | _lttng_event_unregister(event); | |
2465 | } | |
07dfc1d0 MD |
2466 | |
2467 | /* Check if has enablers without bytecode enabled */ | |
2468 | list_for_each_entry(enabler_ref, | |
2469 | &event->enablers_ref_head, node) { | |
2470 | if (enabler_ref->ref->enabled | |
2471 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2472 | has_enablers_without_bytecode = 1; | |
2473 | break; | |
2474 | } | |
2475 | } | |
2476 | event->has_enablers_without_bytecode = | |
2477 | has_enablers_without_bytecode; | |
2478 | ||
2479 | /* Enable filters */ | |
2480 | list_for_each_entry(runtime, | |
183e8b3a | 2481 | &event->filter_bytecode_runtime_head, node) |
07dfc1d0 | 2482 | lttng_filter_sync_state(runtime); |
3c997079 MD |
2483 | } |
2484 | } | |
2485 | ||
2486 | /* | |
2487 | * Apply enablers to session events, adding events to session if need | |
2488 | * be. It is required after each modification applied to an active | |
2489 | * session, and right before session "start". | |
2490 | * "lazy" sync means we only sync if required. | |
2491 | * Should be called with sessions mutex held. | |
2492 | */ | |
2493 | static | |
b2bc0bc8 | 2494 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2495 | { |
2496 | /* We can skip if session is not active */ | |
2497 | if (!session->active) | |
2498 | return; | |
b2bc0bc8 | 2499 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2500 | } |
2501 | ||
b01155ba FD |
2502 | static |
2503 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2504 | { | |
2505 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2506 | struct lttng_event_notifier *event_notifier; | |
2507 | ||
2508 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2509 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2510 | ||
2511 | /* | |
2512 | * For each event_notifier, if at least one of its enablers is enabled, | |
2513 | * we enable the event_notifier, else we disable it. | |
2514 | */ | |
2515 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2516 | struct lttng_enabler_ref *enabler_ref; | |
2517 | struct lttng_bytecode_runtime *runtime; | |
2518 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2519 | ||
2520 | switch (event_notifier->instrumentation) { | |
2521 | case LTTNG_KERNEL_TRACEPOINT: | |
2522 | case LTTNG_KERNEL_SYSCALL: | |
2523 | /* Enable event_notifiers */ | |
2524 | list_for_each_entry(enabler_ref, | |
2525 | &event_notifier->enablers_ref_head, node) { | |
2526 | if (enabler_ref->ref->enabled) { | |
2527 | enabled = 1; | |
2528 | break; | |
2529 | } | |
2530 | } | |
2531 | break; | |
2532 | default: | |
2533 | /* Not handled with sync. */ | |
2534 | continue; | |
2535 | } | |
2536 | ||
2537 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2538 | /* | |
2539 | * Sync tracepoint registration with event_notifier enabled | |
2540 | * state. | |
2541 | */ | |
2542 | if (enabled) { | |
2543 | if (!event_notifier->registered) | |
2544 | register_event_notifier(event_notifier); | |
2545 | } else { | |
2546 | if (event_notifier->registered) | |
2547 | _lttng_event_notifier_unregister(event_notifier); | |
2548 | } | |
2549 | ||
2550 | /* Check if has enablers without bytecode enabled */ | |
2551 | list_for_each_entry(enabler_ref, | |
2552 | &event_notifier->enablers_ref_head, node) { | |
2553 | if (enabler_ref->ref->enabled | |
2554 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2555 | has_enablers_without_bytecode = 1; | |
2556 | break; | |
2557 | } | |
2558 | } | |
2559 | event_notifier->has_enablers_without_bytecode = | |
2560 | has_enablers_without_bytecode; | |
2561 | ||
2562 | /* Enable filters */ | |
2563 | list_for_each_entry(runtime, | |
183e8b3a FD |
2564 | &event_notifier->filter_bytecode_runtime_head, node) |
2565 | lttng_filter_sync_state(runtime); | |
b01155ba FD |
2566 | } |
2567 | } | |
2568 | ||
1ec3f75a | 2569 | /* |
d83004aa JD |
2570 | * Serialize at most one packet worth of metadata into a metadata |
2571 | * channel. | |
92d9f5e6 MD |
2572 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2573 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2574 | * allows us to do racy operations such as looking for remaining space left in | |
2575 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2576 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2577 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2578 | * Returns the number of bytes written in the channel, 0 if no data |
2579 | * was written and a negative value on error. | |
1ec3f75a | 2580 | */ |
b3b8072b | 2581 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2582 | struct channel *chan, bool *coherent) |
d83004aa JD |
2583 | { |
2584 | struct lib_ring_buffer_ctx ctx; | |
2585 | int ret = 0; | |
2586 | size_t len, reserve_len; | |
2587 | ||
f613e3e6 | 2588 | /* |
92d9f5e6 MD |
2589 | * Ensure we support mutiple get_next / put sequences followed by |
2590 | * put_next. The metadata cache lock protects reading the metadata | |
2591 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2592 | * "flush" operations on the buffer invoked by different processes. | |
2593 | * Moreover, since the metadata cache memory can be reallocated, we | |
2594 | * need to have exclusive access against updates even though we only | |
2595 | * read it. | |
f613e3e6 | 2596 | */ |
92d9f5e6 | 2597 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2598 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2599 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2600 | goto end; |
f613e3e6 | 2601 | |
9616f0bf JD |
2602 | /* Metadata regenerated, change the version. */ |
2603 | if (stream->metadata_cache->version != stream->version) | |
2604 | stream->version = stream->metadata_cache->version; | |
2605 | ||
d83004aa | 2606 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2607 | stream->metadata_in; |
9de2c215 | 2608 | if (!len) |
de23d59d | 2609 | goto end; |
d83004aa | 2610 | reserve_len = min_t(size_t, |
b3b8072b | 2611 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2612 | len); |
b3b8072b | 2613 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2614 | sizeof(char), -1); |
2615 | /* | |
2616 | * If reservation failed, return an error to the caller. | |
2617 | */ | |
b3b8072b | 2618 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2619 | if (ret != 0) { |
2620 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2621 | stream->coherent = false; |
d83004aa JD |
2622 | goto end; |
2623 | } | |
b3b8072b | 2624 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2625 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2626 | reserve_len); |
b3b8072b | 2627 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2628 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2629 | if (reserve_len < len) |
8b97fd42 MD |
2630 | stream->coherent = false; |
2631 | else | |
2632 | stream->coherent = true; | |
d83004aa JD |
2633 | ret = reserve_len; |
2634 | ||
2635 | end: | |
8b97fd42 MD |
2636 | if (coherent) |
2637 | *coherent = stream->coherent; | |
92d9f5e6 | 2638 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2639 | return ret; |
2640 | } | |
2641 | ||
8b97fd42 MD |
2642 | static |
2643 | void lttng_metadata_begin(struct lttng_session *session) | |
2644 | { | |
3e75e2a7 MD |
2645 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2646 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2647 | } |
2648 | ||
2649 | static | |
2650 | void lttng_metadata_end(struct lttng_session *session) | |
2651 | { | |
3e75e2a7 MD |
2652 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2653 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2654 | struct lttng_metadata_stream *stream; | |
2655 | ||
3e75e2a7 MD |
2656 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2657 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2658 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2659 | } |
8b97fd42 MD |
2660 | } |
2661 | ||
d83004aa JD |
2662 | /* |
2663 | * Write the metadata to the metadata cache. | |
2664 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2665 | * The metadata cache lock protects us from concurrent read access from |
2666 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2667 | * The content of the printf is printed as a single atomic metadata |
2668 | * transaction. | |
d83004aa | 2669 | */ |
a90917c3 | 2670 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2671 | const char *fmt, ...) |
2672 | { | |
c099397a | 2673 | char *str; |
d83004aa | 2674 | size_t len; |
c099397a MD |
2675 | va_list ap; |
2676 | ||
585e5dcc | 2677 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2678 | |
2679 | va_start(ap, fmt); | |
2680 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2681 | va_end(ap); | |
2682 | if (!str) | |
2683 | return -ENOMEM; | |
2684 | ||
1ec3f75a | 2685 | len = strlen(str); |
3e75e2a7 | 2686 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2687 | if (session->metadata_cache->metadata_written + len > |
2688 | session->metadata_cache->cache_alloc) { | |
2689 | char *tmp_cache_realloc; | |
2690 | unsigned int tmp_cache_alloc_size; | |
2691 | ||
2692 | tmp_cache_alloc_size = max_t(unsigned int, | |
2693 | session->metadata_cache->cache_alloc + len, | |
2694 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2695 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2696 | if (!tmp_cache_realloc) |
2697 | goto err; | |
a606b6e8 ML |
2698 | if (session->metadata_cache->data) { |
2699 | memcpy(tmp_cache_realloc, | |
2700 | session->metadata_cache->data, | |
2701 | session->metadata_cache->cache_alloc); | |
2702 | vfree(session->metadata_cache->data); | |
2703 | } | |
2704 | ||
d83004aa JD |
2705 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2706 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2707 | } |
d83004aa JD |
2708 | memcpy(session->metadata_cache->data + |
2709 | session->metadata_cache->metadata_written, | |
2710 | str, len); | |
2711 | session->metadata_cache->metadata_written += len; | |
c099397a | 2712 | kfree(str); |
d83004aa | 2713 | |
d83004aa JD |
2714 | return 0; |
2715 | ||
2716 | err: | |
2717 | kfree(str); | |
2718 | return -ENOMEM; | |
c099397a MD |
2719 | } |
2720 | ||
f513b2bf MD |
2721 | static |
2722 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2723 | { | |
2724 | size_t i; | |
2725 | ||
2726 | for (i = 0; i < nesting; i++) { | |
2727 | int ret; | |
2728 | ||
2729 | ret = lttng_metadata_printf(session, " "); | |
2730 | if (ret) { | |
2731 | return ret; | |
2732 | } | |
2733 | } | |
2734 | return 0; | |
2735 | } | |
2736 | ||
ceabb767 MD |
2737 | static |
2738 | int lttng_field_name_statedump(struct lttng_session *session, | |
2739 | const struct lttng_event_field *field, | |
2740 | size_t nesting) | |
2741 | { | |
2742 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2743 | } | |
2744 | ||
2745 | static | |
2746 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2747 | const struct lttng_type *type, | |
2748 | size_t nesting) | |
2749 | { | |
2750 | int ret; | |
2751 | ||
2752 | WARN_ON_ONCE(type->atype != atype_integer); | |
2753 | ret = print_tabs(session, nesting); | |
2754 | if (ret) | |
2755 | return ret; | |
2756 | ret = lttng_metadata_printf(session, | |
2757 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2758 | type->u.integer.size, | |
2759 | type->u.integer.alignment, | |
2760 | type->u.integer.signedness, | |
2761 | (type->u.integer.encoding == lttng_encode_none) | |
2762 | ? "none" | |
2763 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2764 | ? "UTF8" | |
2765 | : "ASCII", | |
2766 | type->u.integer.base, | |
2767 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2768 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2769 | #else | |
2770 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2771 | #endif | |
2772 | ); | |
2773 | return ret; | |
2774 | } | |
2775 | ||
f513b2bf MD |
2776 | /* |
2777 | * Must be called with sessions_mutex held. | |
2778 | */ | |
2779 | static | |
2780 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2781 | const struct lttng_type *type, | |
2782 | size_t nesting) | |
2783 | { | |
2784 | int ret; | |
2785 | uint32_t i, nr_fields; | |
ceabb767 MD |
2786 | unsigned int alignment; |
2787 | ||
2788 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2789 | |
2790 | ret = print_tabs(session, nesting); | |
2791 | if (ret) | |
2792 | return ret; | |
2793 | ret = lttng_metadata_printf(session, | |
2794 | "struct {\n"); | |
2795 | if (ret) | |
2796 | return ret; | |
ceabb767 | 2797 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2798 | for (i = 0; i < nr_fields; i++) { |
2799 | const struct lttng_event_field *iter_field; | |
2800 | ||
ceabb767 | 2801 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2802 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2803 | if (ret) | |
2804 | return ret; | |
2805 | } | |
2806 | ret = print_tabs(session, nesting); | |
2807 | if (ret) | |
2808 | return ret; | |
ceabb767 MD |
2809 | alignment = type->u.struct_nestable.alignment; |
2810 | if (alignment) { | |
2811 | ret = lttng_metadata_printf(session, | |
2812 | "} align(%u)", | |
2813 | alignment); | |
2814 | } else { | |
2815 | ret = lttng_metadata_printf(session, | |
2816 | "}"); | |
2817 | } | |
f513b2bf MD |
2818 | return ret; |
2819 | } | |
2820 | ||
2821 | /* | |
2822 | * Must be called with sessions_mutex held. | |
2823 | */ | |
2824 | static | |
ceabb767 | 2825 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2826 | const struct lttng_event_field *field, |
2827 | size_t nesting) | |
2828 | { | |
2829 | int ret; | |
2830 | ||
2831 | ret = _lttng_struct_type_statedump(session, | |
2832 | &field->type, nesting); | |
2833 | if (ret) | |
2834 | return ret; | |
ceabb767 | 2835 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2836 | } |
2837 | ||
65c85aa6 MD |
2838 | /* |
2839 | * Must be called with sessions_mutex held. | |
2840 | */ | |
2841 | static | |
2842 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2843 | const struct lttng_type *type, | |
2844 | size_t nesting) | |
2845 | { | |
2846 | int ret; | |
2847 | uint32_t i, nr_choices; | |
2848 | ||
ceabb767 MD |
2849 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2850 | /* | |
2851 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2852 | */ | |
2853 | if (type->u.variant_nestable.alignment != 0) | |
2854 | return -EINVAL; | |
65c85aa6 MD |
2855 | ret = print_tabs(session, nesting); |
2856 | if (ret) | |
2857 | return ret; | |
2858 | ret = lttng_metadata_printf(session, | |
2859 | "variant <_%s> {\n", | |
ceabb767 | 2860 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2861 | if (ret) |
2862 | return ret; | |
ceabb767 | 2863 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2864 | for (i = 0; i < nr_choices; i++) { |
2865 | const struct lttng_event_field *iter_field; | |
2866 | ||
ceabb767 | 2867 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2868 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2869 | if (ret) | |
2870 | return ret; | |
2871 | } | |
2872 | ret = print_tabs(session, nesting); | |
2873 | if (ret) | |
2874 | return ret; | |
2875 | ret = lttng_metadata_printf(session, | |
2876 | "}"); | |
2877 | return ret; | |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * Must be called with sessions_mutex held. | |
2882 | */ | |
2883 | static | |
ceabb767 | 2884 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2885 | const struct lttng_event_field *field, |
2886 | size_t nesting) | |
2887 | { | |
2888 | int ret; | |
2889 | ||
2890 | ret = _lttng_variant_type_statedump(session, | |
2891 | &field->type, nesting); | |
2892 | if (ret) | |
2893 | return ret; | |
ceabb767 | 2894 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2895 | } |
2896 | ||
f513b2bf MD |
2897 | /* |
2898 | * Must be called with sessions_mutex held. | |
2899 | */ | |
2900 | static | |
ceabb767 | 2901 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2902 | const struct lttng_event_field *field, |
2903 | size_t nesting) | |
2904 | { | |
2905 | int ret; | |
2906 | const struct lttng_type *elem_type; | |
2907 | ||
ceabb767 MD |
2908 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2909 | ||
2910 | if (field->type.u.array_nestable.alignment) { | |
2911 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2912 | if (ret) |
2913 | return ret; | |
ceabb767 MD |
2914 | ret = lttng_metadata_printf(session, |
2915 | "struct { } align(%u) _%s_padding;\n", | |
2916 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2917 | field->name); | |
2918 | if (ret) | |
2919 | return ret; | |
2920 | } | |
2921 | /* | |
2922 | * Nested compound types: Only array of structures and variants are | |
2923 | * currently supported. | |
2924 | */ | |
2925 | elem_type = field->type.u.array_nestable.elem_type; | |
2926 | switch (elem_type->atype) { | |
2927 | case atype_integer: | |
2928 | case atype_struct_nestable: | |
2929 | case atype_variant_nestable: | |
2930 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2931 | if (ret) |
2932 | return ret; | |
2933 | break; | |
ceabb767 | 2934 | |
f513b2bf MD |
2935 | default: |
2936 | return -EINVAL; | |
2937 | } | |
2938 | ret = lttng_metadata_printf(session, | |
2939 | " _%s[%u];\n", | |
2940 | field->name, | |
ceabb767 | 2941 | field->type.u.array_nestable.length); |
f513b2bf MD |
2942 | return ret; |
2943 | } | |
2944 | ||
2945 | /* | |
2946 | * Must be called with sessions_mutex held. | |
2947 | */ | |
2948 | static | |
ceabb767 | 2949 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2950 | const struct lttng_event_field *field, |
2951 | size_t nesting) | |
2952 | { | |
2953 | int ret; | |
2954 | const char *length_name; | |
2955 | const struct lttng_type *elem_type; | |
2956 | ||
ceabb767 | 2957 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2958 | |
ceabb767 MD |
2959 | length_name = field->type.u.sequence_nestable.length_name; |
2960 | ||
2961 | if (field->type.u.sequence_nestable.alignment) { | |
2962 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2963 | if (ret) |
2964 | return ret; | |
ceabb767 MD |
2965 | ret = lttng_metadata_printf(session, |
2966 | "struct { } align(%u) _%s_padding;\n", | |
2967 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2968 | field->name); | |
2969 | if (ret) | |
2970 | return ret; | |
2971 | } | |
2972 | ||
2973 | /* | |
2974 | * Nested compound types: Only array of structures and variants are | |
2975 | * currently supported. | |
2976 | */ | |
2977 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2978 | switch (elem_type->atype) { | |
2979 | case atype_integer: | |
2980 | case atype_struct_nestable: | |
2981 | case atype_variant_nestable: | |
2982 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2983 | if (ret) |
2984 | return ret; | |
2985 | break; | |
ceabb767 | 2986 | |
f513b2bf MD |
2987 | default: |
2988 | return -EINVAL; | |
2989 | } | |
2990 | ret = lttng_metadata_printf(session, | |
2991 | " _%s[ _%s ];\n", | |
2992 | field->name, | |
ceabb767 | 2993 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2994 | return ret; |
2995 | } | |
2996 | ||
141ddf28 MD |
2997 | /* |
2998 | * Must be called with sessions_mutex held. | |
2999 | */ | |
3000 | static | |
ceabb767 MD |
3001 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3002 | const struct lttng_type *type, | |
141ddf28 MD |
3003 | size_t nesting) |
3004 | { | |
3005 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3006 | const struct lttng_type *container_type; |
141ddf28 MD |
3007 | int ret; |
3008 | unsigned int i, nr_entries; | |
3009 | ||
ceabb767 MD |
3010 | container_type = type->u.enum_nestable.container_type; |
3011 | if (container_type->atype != atype_integer) { | |
3012 | ret = -EINVAL; | |
3013 | goto end; | |
3014 | } | |
3015 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3016 | nr_entries = enum_desc->nr_entries; |
3017 | ||
3018 | ret = print_tabs(session, nesting); | |
3019 | if (ret) | |
3020 | goto end; | |
ceabb767 MD |
3021 | ret = lttng_metadata_printf(session, "enum : "); |
3022 | if (ret) | |
3023 | goto end; | |
3024 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3025 | if (ret) |
ceabb767 MD |
3026 | goto end; |
3027 | ret = lttng_metadata_printf(session, " {\n"); | |
3028 | if (ret) | |
3029 | goto end; | |
141ddf28 MD |
3030 | /* Dump all entries */ |
3031 | for (i = 0; i < nr_entries; i++) { | |
3032 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3033 | int j, len; | |
3034 | ||
3035 | ret = print_tabs(session, nesting + 1); | |
3036 | if (ret) | |
3037 | goto end; | |
3038 | ret = lttng_metadata_printf(session, | |
3039 | "\""); | |
3040 | if (ret) | |
3041 | goto end; | |
3042 | len = strlen(entry->string); | |
3043 | /* Escape the character '"' */ | |
3044 | for (j = 0; j < len; j++) { | |
3045 | char c = entry->string[j]; | |
3046 | ||
3047 | switch (c) { | |
3048 | case '"': | |
3049 | ret = lttng_metadata_printf(session, | |
3050 | "\\\""); | |
3051 | break; | |
3052 | case '\\': | |
3053 | ret = lttng_metadata_printf(session, | |
3054 | "\\\\"); | |
3055 | break; | |
3056 | default: | |
3057 | ret = lttng_metadata_printf(session, | |
3058 | "%c", c); | |
3059 | break; | |
3060 | } | |
3061 | if (ret) | |
3062 | goto end; | |
3063 | } | |
08ad1061 PP |
3064 | ret = lttng_metadata_printf(session, "\""); |
3065 | if (ret) | |
3066 | goto end; | |
3067 | ||
3068 | if (entry->options.is_auto) { | |
3069 | ret = lttng_metadata_printf(session, ",\n"); | |
3070 | if (ret) | |
3071 | goto end; | |
141ddf28 | 3072 | } else { |
7c559490 MD |
3073 | ret = lttng_metadata_printf(session, |
3074 | " = "); | |
3075 | if (ret) | |
3076 | goto end; | |
3077 | if (entry->start.signedness) | |
141ddf28 | 3078 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3079 | "%lld", (long long) entry->start.value); |
3080 | else | |
3081 | ret = lttng_metadata_printf(session, | |
3082 | "%llu", entry->start.value); | |
3083 | if (ret) | |
3084 | goto end; | |
3085 | if (entry->start.signedness == entry->end.signedness && | |
3086 | entry->start.value | |
3087 | == entry->end.value) { | |
141ddf28 | 3088 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3089 | ",\n"); |
3090 | } else { | |
3091 | if (entry->end.signedness) { | |
3092 | ret = lttng_metadata_printf(session, | |
3093 | " ... %lld,\n", | |
3094 | (long long) entry->end.value); | |
3095 | } else { | |
3096 | ret = lttng_metadata_printf(session, | |
3097 | " ... %llu,\n", | |
3098 | entry->end.value); | |
3099 | } | |
141ddf28 | 3100 | } |
7c559490 MD |
3101 | if (ret) |
3102 | goto end; | |
141ddf28 | 3103 | } |
141ddf28 MD |
3104 | } |
3105 | ret = print_tabs(session, nesting); | |
3106 | if (ret) | |
3107 | goto end; | |
ceabb767 | 3108 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3109 | end: |
3110 | return ret; | |
3111 | } | |
3112 | ||
d83004aa JD |
3113 | /* |
3114 | * Must be called with sessions_mutex held. | |
3115 | */ | |
c099397a | 3116 | static |
ceabb767 MD |
3117 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3118 | const struct lttng_event_field *field, | |
3119 | size_t nesting) | |
3120 | { | |
3121 | int ret; | |
3122 | ||
3123 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3124 | if (ret) | |
3125 | return ret; | |
3126 | return lttng_field_name_statedump(session, field, nesting); | |
3127 | } | |
3128 | ||
3129 | static | |
3130 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3131 | const struct lttng_event_field *field, | |
3132 | size_t nesting) | |
3133 | { | |
3134 | int ret; | |
3135 | ||
3136 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3137 | if (ret) | |
3138 | return ret; | |
3139 | return lttng_field_name_statedump(session, field, nesting); | |
3140 | } | |
3141 | ||
3142 | static | |
3143 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3144 | const struct lttng_type *type, | |
3145 | size_t nesting) | |
3146 | { | |
3147 | int ret; | |
3148 | ||
3149 | WARN_ON_ONCE(type->atype != atype_string); | |
3150 | /* Default encoding is UTF8 */ | |
3151 | ret = print_tabs(session, nesting); | |
3152 | if (ret) | |
3153 | return ret; | |
3154 | ret = lttng_metadata_printf(session, | |
3155 | "string%s", | |
3156 | type->u.string.encoding == lttng_encode_ASCII ? | |
3157 | " { encoding = ASCII; }" : ""); | |
3158 | return ret; | |
3159 | } | |
3160 | ||
3161 | static | |
3162 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3163 | const struct lttng_event_field *field, |
3164 | size_t nesting) | |
ceabb767 MD |
3165 | { |
3166 | int ret; | |
3167 | ||
3168 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3169 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3170 | if (ret) | |
3171 | return ret; | |
3172 | return lttng_field_name_statedump(session, field, nesting); | |
3173 | } | |
3174 | ||
3175 | /* | |
3176 | * Must be called with sessions_mutex held. | |
3177 | */ | |
3178 | static | |
3179 | int _lttng_type_statedump(struct lttng_session *session, | |
3180 | const struct lttng_type *type, | |
3181 | size_t nesting) | |
c099397a | 3182 | { |
c099397a | 3183 | int ret = 0; |
c099397a | 3184 | |
ceabb767 | 3185 | switch (type->atype) { |
8070f5c0 | 3186 | case atype_integer: |
ceabb767 | 3187 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3188 | break; |
ceabb767 MD |
3189 | case atype_enum_nestable: |
3190 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3191 | break; |
ceabb767 MD |
3192 | case atype_string: |
3193 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3194 | break; | |
3195 | case atype_struct_nestable: | |
3196 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3197 | break; |
ceabb767 MD |
3198 | case atype_variant_nestable: |
3199 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3200 | break; | |
3201 | ||
3202 | /* Nested arrays and sequences are not supported yet. */ | |
3203 | case atype_array_nestable: | |
3204 | case atype_sequence_nestable: | |
3205 | default: | |
3206 | WARN_ON_ONCE(1); | |
3207 | return -EINVAL; | |
8070f5c0 | 3208 | } |
ceabb767 MD |
3209 | return ret; |
3210 | } | |
8070f5c0 | 3211 | |
ceabb767 MD |
3212 | /* |
3213 | * Must be called with sessions_mutex held. | |
3214 | */ | |
3215 | static | |
3216 | int _lttng_field_statedump(struct lttng_session *session, | |
3217 | const struct lttng_event_field *field, | |
3218 | size_t nesting) | |
3219 | { | |
3220 | int ret = 0; | |
27d2368e | 3221 | |
ceabb767 MD |
3222 | switch (field->type.atype) { |
3223 | case atype_integer: | |
3224 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3225 | break; | |
3226 | case atype_enum_nestable: | |
3227 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3228 | break; |
8070f5c0 | 3229 | case atype_string: |
ceabb767 | 3230 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3231 | break; |
ceabb767 MD |
3232 | case atype_struct_nestable: |
3233 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3234 | break; |
ceabb767 MD |
3235 | case atype_array_nestable: |
3236 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3237 | break; |
ceabb767 MD |
3238 | case atype_sequence_nestable: |
3239 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3240 | break; |
ceabb767 MD |
3241 | case atype_variant_nestable: |
3242 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3243 | break; |
f513b2bf | 3244 | |
8070f5c0 MD |
3245 | default: |
3246 | WARN_ON_ONCE(1); | |
3247 | return -EINVAL; | |
3248 | } | |
3249 | return ret; | |
3250 | } | |
3251 | ||
3252 | static | |
a90917c3 | 3253 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3254 | struct lttng_ctx *ctx) |
3255 | { | |
3256 | int ret = 0; | |
3257 | int i; | |
3258 | ||
3259 | if (!ctx) | |
3260 | return 0; | |
3261 | for (i = 0; i < ctx->nr_fields; i++) { | |
3262 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3263 | ||
f513b2bf | 3264 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3265 | if (ret) |
3266 | return ret; | |
3267 | } | |
3268 | return ret; | |
3269 | } | |
3270 | ||
3271 | static | |
a90917c3 MD |
3272 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3273 | struct lttng_event *event) | |
8070f5c0 MD |
3274 | { |
3275 | const struct lttng_event_desc *desc = event->desc; | |
3276 | int ret = 0; | |
3277 | int i; | |
3278 | ||
3279 | for (i = 0; i < desc->nr_fields; i++) { | |
3280 | const struct lttng_event_field *field = &desc->fields[i]; | |
3281 | ||
f513b2bf | 3282 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3283 | if (ret) |
3284 | return ret; | |
c099397a MD |
3285 | } |
3286 | return ret; | |
3287 | } | |
3288 | ||
d83004aa JD |
3289 | /* |
3290 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3291 | * The entire event metadata is printed as a single atomic metadata |
3292 | * transaction. | |
d83004aa | 3293 | */ |
c099397a | 3294 | static |
a90917c3 MD |
3295 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3296 | struct lttng_channel *chan, | |
3297 | struct lttng_event *event) | |
c099397a MD |
3298 | { |
3299 | int ret = 0; | |
3300 | ||
585e5dcc | 3301 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3302 | return 0; |
d83004aa | 3303 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3304 | return 0; |
3305 | ||
8b97fd42 MD |
3306 | lttng_metadata_begin(session); |
3307 | ||
c099397a MD |
3308 | ret = lttng_metadata_printf(session, |
3309 | "event {\n" | |
ae734547 | 3310 | " name = \"%s\";\n" |
c099397a | 3311 | " id = %u;\n" |
b9074a1b | 3312 | " stream_id = %u;\n", |
c099397a MD |
3313 | event->desc->name, |
3314 | event->id, | |
3315 | event->chan->id); | |
3316 | if (ret) | |
3317 | goto end; | |
3318 | ||
b9074a1b MD |
3319 | if (event->ctx) { |
3320 | ret = lttng_metadata_printf(session, | |
3321 | " context := struct {\n"); | |
3322 | if (ret) | |
3323 | goto end; | |
3324 | } | |
a90917c3 | 3325 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3326 | if (ret) |
3327 | goto end; | |
b9074a1b MD |
3328 | if (event->ctx) { |
3329 | ret = lttng_metadata_printf(session, | |
3330 | " };\n"); | |
3331 | if (ret) | |
3332 | goto end; | |
3333 | } | |
8070f5c0 MD |
3334 | |
3335 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3336 | " fields := struct {\n" |
3337 | ); | |
3338 | if (ret) | |
3339 | goto end; | |
3340 | ||
a90917c3 | 3341 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3342 | if (ret) |
3343 | goto end; | |
3344 | ||
3345 | /* | |
3346 | * LTTng space reservation can only reserve multiples of the | |
3347 | * byte size. | |
3348 | */ | |
3349 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3350 | " };\n" |
3351 | "};\n\n"); | |
c099397a MD |
3352 | if (ret) |
3353 | goto end; | |
3354 | ||
c099397a MD |
3355 | event->metadata_dumped = 1; |
3356 | end: | |
8b97fd42 | 3357 | lttng_metadata_end(session); |
c099397a MD |
3358 | return ret; |
3359 | ||
3360 | } | |
3361 | ||
d83004aa JD |
3362 | /* |
3363 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3364 | * The entire channel metadata is printed as a single atomic metadata |
3365 | * transaction. | |
d83004aa | 3366 | */ |
c099397a | 3367 | static |
a90917c3 MD |
3368 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3369 | struct lttng_channel *chan) | |
c099397a MD |
3370 | { |
3371 | int ret = 0; | |
3372 | ||
585e5dcc | 3373 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3374 | return 0; |
d83004aa JD |
3375 | |
3376 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3377 | return 0; |
3378 | ||
8b97fd42 MD |
3379 | lttng_metadata_begin(session); |
3380 | ||
c099397a MD |
3381 | WARN_ON_ONCE(!chan->header_type); |
3382 | ret = lttng_metadata_printf(session, | |
3383 | "stream {\n" | |
3384 | " id = %u;\n" | |
9115fbdc | 3385 | " event.header := %s;\n" |
b9074a1b | 3386 | " packet.context := struct packet_context;\n", |
c099397a MD |
3387 | chan->id, |
3388 | chan->header_type == 1 ? "struct event_header_compact" : | |
3389 | "struct event_header_large"); | |
3390 | if (ret) | |
3391 | goto end; | |
3392 | ||
b9074a1b MD |
3393 | if (chan->ctx) { |
3394 | ret = lttng_metadata_printf(session, | |
3395 | " event.context := struct {\n"); | |
3396 | if (ret) | |
3397 | goto end; | |
3398 | } | |
a90917c3 | 3399 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3400 | if (ret) |
3401 | goto end; | |
b9074a1b MD |
3402 | if (chan->ctx) { |
3403 | ret = lttng_metadata_printf(session, | |
3404 | " };\n"); | |
3405 | if (ret) | |
3406 | goto end; | |
3407 | } | |
8070f5c0 MD |
3408 | |
3409 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3410 | "};\n\n"); |
8070f5c0 | 3411 | |
c099397a MD |
3412 | chan->metadata_dumped = 1; |
3413 | end: | |
8b97fd42 | 3414 | lttng_metadata_end(session); |
c099397a MD |
3415 | return ret; |
3416 | } | |
3417 | ||
d83004aa JD |
3418 | /* |
3419 | * Must be called with sessions_mutex held. | |
3420 | */ | |
9115fbdc | 3421 | static |
a90917c3 | 3422 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3423 | { |
3424 | return lttng_metadata_printf(session, | |
3425 | "struct packet_context {\n" | |
a3ccff4f MD |
3426 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3427 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3428 | " uint64_t content_size;\n" |
3429 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3430 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3431 | " unsigned long events_discarded;\n" |
9115fbdc | 3432 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3433 | "};\n\n" |
9115fbdc MD |
3434 | ); |
3435 | } | |
3436 | ||
3437 | /* | |
3438 | * Compact header: | |
3439 | * id: range: 0 - 30. | |
3440 | * id 31 is reserved to indicate an extended header. | |
3441 | * | |
3442 | * Large header: | |
3443 | * id: range: 0 - 65534. | |
3444 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3445 | * |
3446 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3447 | */ |
3448 | static | |
a90917c3 | 3449 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3450 | { |
3451 | return lttng_metadata_printf(session, | |
3452 | "struct event_header_compact {\n" | |
3453 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3454 | " variant <id> {\n" | |
3455 | " struct {\n" | |
a3ccff4f | 3456 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3457 | " } compact;\n" |
3458 | " struct {\n" | |
3459 | " uint32_t id;\n" | |
a3ccff4f | 3460 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3461 | " } extended;\n" |
3462 | " } v;\n" | |
3463 | "} align(%u);\n" | |
3464 | "\n" | |
3465 | "struct event_header_large {\n" | |
3466 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3467 | " variant <id> {\n" | |
3468 | " struct {\n" | |
a3ccff4f | 3469 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3470 | " } compact;\n" |
3471 | " struct {\n" | |
3472 | " uint32_t id;\n" | |
a3ccff4f | 3473 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3474 | " } extended;\n" |
3475 | " } v;\n" | |
3476 | "} align(%u);\n\n", | |
a90917c3 MD |
3477 | lttng_alignof(uint32_t) * CHAR_BIT, |
3478 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3479 | ); |
3480 | } | |
3481 | ||
a3ccff4f MD |
3482 | /* |
3483 | * Approximation of NTP time of day to clock monotonic correlation, | |
3484 | * taken at start of trace. | |
3485 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3486 | * in future versions. | |
5283350b MD |
3487 | * This function may return a negative offset. It may happen if the |
3488 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3489 | * |
3490 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3491 | * y2038 compliant. | |
a3ccff4f MD |
3492 | */ |
3493 | static | |
8967b2a3 | 3494 | int64_t measure_clock_offset(void) |
a3ccff4f | 3495 | { |
dcb93448 | 3496 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3497 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3498 | int64_t offset; |
a3ccff4f | 3499 | unsigned long flags; |
3636085f MJ |
3500 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3501 | struct timespec64 rts = { 0, 0 }; | |
3502 | #else | |
3503 | struct timespec rts = { 0, 0 }; | |
3504 | #endif | |
a3ccff4f MD |
3505 | |
3506 | /* Disable interrupts to increase correlation precision. */ | |
3507 | local_irq_save(flags); | |
3508 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3509 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3510 | ktime_get_real_ts64(&rts); | |
3511 | #else | |
216b6baa | 3512 | getnstimeofday(&rts); |
3636085f | 3513 | #endif |
a3ccff4f MD |
3514 | monotonic[1] = trace_clock_read64(); |
3515 | local_irq_restore(flags); | |
3516 | ||
dcb93448 | 3517 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3518 | realtime = (uint64_t) rts.tv_sec * tcf; |
3519 | if (tcf == NSEC_PER_SEC) { | |
3520 | realtime += rts.tv_nsec; | |
3521 | } else { | |
3522 | uint64_t n = rts.tv_nsec * tcf; | |
3523 | ||
3524 | do_div(n, NSEC_PER_SEC); | |
3525 | realtime += n; | |
3526 | } | |
dcb93448 | 3527 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3528 | return offset; |
3529 | } | |
3530 | ||
3eb95be4 JR |
3531 | static |
3532 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3533 | { | |
0f3eaad4 | 3534 | int ret = 0; |
3eb95be4 JR |
3535 | size_t i; |
3536 | char cur; | |
3537 | ||
3538 | i = 0; | |
3539 | cur = string[i]; | |
3540 | while (cur != '\0') { | |
3541 | switch (cur) { | |
3542 | case '\n': | |
3543 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3544 | break; | |
3545 | case '\\': | |
3546 | case '"': | |
3547 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3548 | if (ret) | |
3549 | goto error; | |
3550 | /* We still print the current char */ | |
3551 | /* Fallthrough */ | |
3552 | default: | |
3553 | ret = lttng_metadata_printf(session, "%c", cur); | |
3554 | break; | |
3555 | } | |
3556 | ||
3557 | if (ret) | |
3558 | goto error; | |
3559 | ||
3560 | cur = string[++i]; | |
3561 | } | |
3562 | error: | |
3563 | return ret; | |
3564 | } | |
3565 | ||
3566 | static | |
1c88f269 JR |
3567 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3568 | const char *field_value) | |
3eb95be4 JR |
3569 | { |
3570 | int ret; | |
3571 | ||
1c88f269 | 3572 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3573 | if (ret) |
3574 | goto error; | |
3575 | ||
1c88f269 | 3576 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3577 | if (ret) |
3578 | goto error; | |
3579 | ||
3580 | ret = lttng_metadata_printf(session, "\";\n"); | |
3581 | ||
3582 | error: | |
3583 | return ret; | |
3584 | } | |
3585 | ||
c099397a MD |
3586 | /* |
3587 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3588 | * Must be called with sessions_mutex held. |
c099397a MD |
3589 | */ |
3590 | static | |
a90917c3 | 3591 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3592 | { |
30bdb6e4 | 3593 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3594 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3595 | const char *product_uuid; |
a90917c3 MD |
3596 | struct lttng_channel *chan; |
3597 | struct lttng_event *event; | |
c099397a MD |
3598 | int ret = 0; |
3599 | ||
585e5dcc | 3600 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3601 | return 0; |
8b97fd42 MD |
3602 | |
3603 | lttng_metadata_begin(session); | |
3604 | ||
c099397a MD |
3605 | if (session->metadata_dumped) |
3606 | goto skip_session; | |
c099397a | 3607 | |
d793d5e1 | 3608 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3609 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3610 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3611 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3612 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3613 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3614 | |
3615 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3616 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3617 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3618 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3619 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3620 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3621 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3622 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3623 | "\n" |
3624 | "trace {\n" | |
3625 | " major = %u;\n" | |
3626 | " minor = %u;\n" | |
30bdb6e4 | 3627 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3628 | " byte_order = %s;\n" |
3629 | " packet.header := struct {\n" | |
3630 | " uint32_t magic;\n" | |
1ec3f75a | 3631 | " uint8_t uuid[16];\n" |
d793d5e1 | 3632 | " uint32_t stream_id;\n" |
5594698f | 3633 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3634 | " };\n" |
d793d5e1 | 3635 | "};\n\n", |
a90917c3 MD |
3636 | lttng_alignof(uint8_t) * CHAR_BIT, |
3637 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3638 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3639 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3640 | sizeof(unsigned long) * CHAR_BIT, |
3641 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3642 | CTF_SPEC_MAJOR, |
3643 | CTF_SPEC_MINOR, | |
d793d5e1 | 3644 | uuid_s, |
5214fa50 | 3645 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3646 | "be" |
3647 | #else | |
3648 | "le" | |
3649 | #endif | |
3650 | ); | |
3651 | if (ret) | |
3652 | goto end; | |
3653 | ||
99dc9597 MD |
3654 | ret = lttng_metadata_printf(session, |
3655 | "env {\n" | |
a6058143 | 3656 | " hostname = \"%s\";\n" |
c6c9e10f | 3657 | " domain = \"kernel\";\n" |
99dc9597 | 3658 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3659 | " kernel_release = \"%s\";\n" |
3660 | " kernel_version = \"%s\";\n" | |
3661 | " tracer_name = \"lttng-modules\";\n" | |
3662 | " tracer_major = %d;\n" | |
3663 | " tracer_minor = %d;\n" | |
3664 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3665 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3666 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3667 | utsname()->sysname, |
3668 | utsname()->release, | |
c6c9e10f MD |
3669 | utsname()->version, |
3670 | LTTNG_MODULES_MAJOR_VERSION, | |
3671 | LTTNG_MODULES_MINOR_VERSION, | |
3672 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3673 | ); |
3674 | if (ret) | |
3675 | goto end; | |
3676 | ||
1c88f269 JR |
3677 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3678 | if (ret) | |
3679 | goto end; | |
3680 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3681 | session->creation_time); | |
3eb95be4 JR |
3682 | if (ret) |
3683 | goto end; | |
3684 | ||
c88f762e GB |
3685 | /* Add the product UUID to the 'env' section */ |
3686 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3687 | if (product_uuid) { | |
3688 | ret = lttng_metadata_printf(session, | |
3689 | " product_uuid = \"%s\";\n", | |
3690 | product_uuid | |
3691 | ); | |
3692 | if (ret) | |
3693 | goto end; | |
3694 | } | |
3695 | ||
3696 | /* Close the 'env' section */ | |
3eb95be4 JR |
3697 | ret = lttng_metadata_printf(session, "};\n\n"); |
3698 | if (ret) | |
3699 | goto end; | |
3700 | ||
a3ccff4f MD |
3701 | ret = lttng_metadata_printf(session, |
3702 | "clock {\n" | |
2754583e MD |
3703 | " name = \"%s\";\n", |
3704 | trace_clock_name() | |
a82c63f1 MD |
3705 | ); |
3706 | if (ret) | |
3707 | goto end; | |
3708 | ||
3709 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3710 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3711 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3712 | clock_uuid_s |
3713 | ); | |
3714 | if (ret) | |
3715 | goto end; | |
3716 | } | |
3717 | ||
3718 | ret = lttng_metadata_printf(session, | |
2754583e | 3719 | " description = \"%s\";\n" |
a3ccff4f MD |
3720 | " freq = %llu; /* Frequency, in Hz */\n" |
3721 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3722 | " offset = %lld;\n" |
a3ccff4f | 3723 | "};\n\n", |
2754583e | 3724 | trace_clock_description(), |
a3ccff4f | 3725 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3726 | (long long) measure_clock_offset() |
a3ccff4f MD |
3727 | ); |
3728 | if (ret) | |
3729 | goto end; | |
3730 | ||
3731 | ret = lttng_metadata_printf(session, | |
3732 | "typealias integer {\n" | |
3733 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3734 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3735 | "} := uint27_clock_monotonic_t;\n" |
3736 | "\n" | |
3737 | "typealias integer {\n" | |
3738 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3739 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3740 | "} := uint32_clock_monotonic_t;\n" |
3741 | "\n" | |
3742 | "typealias integer {\n" | |
3743 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3744 | " map = clock.%s.value;\n" |
a3ccff4f | 3745 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3746 | trace_clock_name(), |
a3ccff4f | 3747 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3748 | trace_clock_name(), |
3749 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3750 | trace_clock_name() | |
a3ccff4f MD |
3751 | ); |
3752 | if (ret) | |
3753 | goto end; | |
3754 | ||
a90917c3 | 3755 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3756 | if (ret) |
3757 | goto end; | |
3758 | ||
a90917c3 | 3759 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3760 | if (ret) |
3761 | goto end; | |
3762 | ||
c099397a MD |
3763 | skip_session: |
3764 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3765 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3766 | if (ret) |
3767 | goto end; | |
3768 | } | |
3769 | ||
3770 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3771 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3772 | if (ret) |
3773 | goto end; | |
3774 | } | |
3775 | session->metadata_dumped = 1; | |
3776 | end: | |
8b97fd42 | 3777 | lttng_metadata_end(session); |
c099397a MD |
3778 | return ret; |
3779 | } | |
3780 | ||
c0e31d2e | 3781 | /** |
a90917c3 | 3782 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3783 | * @transport: transport structure |
3784 | * | |
3785 | * Registers a transport which can be used as output to extract the data out of | |
3786 | * LTTng. The module calling this registration function must ensure that no | |
3787 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3788 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3789 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3790 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3791 | * after its registration must it synchronize the TLBs. |
3792 | */ | |
a90917c3 | 3793 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3794 | { |
3795 | /* | |
3796 | * Make sure no page fault can be triggered by the module about to be | |
3797 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3798 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3799 | */ |
263b6c88 | 3800 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3801 | |
3802 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3803 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3804 | mutex_unlock(&sessions_mutex); |
3805 | } | |
a90917c3 | 3806 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3807 | |
3808 | /** | |
a90917c3 | 3809 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3810 | * @transport: transport structure |
3811 | */ | |
a90917c3 | 3812 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3813 | { |
3814 | mutex_lock(&sessions_mutex); | |
3815 | list_del(&transport->node); | |
3816 | mutex_unlock(&sessions_mutex); | |
3817 | } | |
a90917c3 | 3818 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3819 | |
894ce5dc | 3820 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3821 | |
3822 | enum cpuhp_state lttng_hp_prepare; | |
3823 | enum cpuhp_state lttng_hp_online; | |
3824 | ||
3825 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3826 | { | |
3827 | struct lttng_cpuhp_node *lttng_node; | |
3828 | ||
3829 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3830 | switch (lttng_node->component) { | |
3831 | case LTTNG_RING_BUFFER_FRONTEND: | |
3832 | return 0; | |
3833 | case LTTNG_RING_BUFFER_BACKEND: | |
3834 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3835 | case LTTNG_RING_BUFFER_ITER: | |
3836 | return 0; | |
3837 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3838 | return 0; | |
3839 | default: | |
3840 | return -EINVAL; | |
3841 | } | |
3842 | } | |
3843 | ||
3844 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3845 | { | |
3846 | struct lttng_cpuhp_node *lttng_node; | |
3847 | ||
3848 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3849 | switch (lttng_node->component) { | |
3850 | case LTTNG_RING_BUFFER_FRONTEND: | |
3851 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3852 | case LTTNG_RING_BUFFER_BACKEND: | |
3853 | return 0; | |
3854 | case LTTNG_RING_BUFFER_ITER: | |
3855 | return 0; | |
3856 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3857 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3858 | default: | |
3859 | return -EINVAL; | |
3860 | } | |
3861 | } | |
3862 | ||
3863 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3864 | { | |
3865 | struct lttng_cpuhp_node *lttng_node; | |
3866 | ||
3867 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3868 | switch (lttng_node->component) { | |
3869 | case LTTNG_RING_BUFFER_FRONTEND: | |
3870 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3871 | case LTTNG_RING_BUFFER_BACKEND: | |
3872 | return 0; | |
3873 | case LTTNG_RING_BUFFER_ITER: | |
3874 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3875 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3876 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3877 | default: | |
3878 | return -EINVAL; | |
3879 | } | |
3880 | } | |
3881 | ||
3882 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3883 | { | |
3884 | struct lttng_cpuhp_node *lttng_node; | |
3885 | ||
3886 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3887 | switch (lttng_node->component) { | |
3888 | case LTTNG_RING_BUFFER_FRONTEND: | |
3889 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3890 | case LTTNG_RING_BUFFER_BACKEND: | |
3891 | return 0; | |
3892 | case LTTNG_RING_BUFFER_ITER: | |
3893 | return 0; | |
3894 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3895 | return 0; | |
3896 | default: | |
3897 | return -EINVAL; | |
3898 | } | |
3899 | } | |
3900 | ||
3901 | static int __init lttng_init_cpu_hotplug(void) | |
3902 | { | |
3903 | int ret; | |
3904 | ||
3905 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3906 | lttng_hotplug_prepare, | |
3907 | lttng_hotplug_dead); | |
3908 | if (ret < 0) { | |
3909 | return ret; | |
3910 | } | |
3911 | lttng_hp_prepare = ret; | |
3912 | lttng_rb_set_hp_prepare(ret); | |
3913 | ||
3914 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3915 | lttng_hotplug_online, | |
3916 | lttng_hotplug_offline); | |
3917 | if (ret < 0) { | |
3918 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3919 | lttng_hp_prepare = 0; | |
3920 | return ret; | |
3921 | } | |
3922 | lttng_hp_online = ret; | |
3923 | lttng_rb_set_hp_online(ret); | |
3924 | ||
3925 | return 0; | |
3926 | } | |
3927 | ||
3928 | static void __exit lttng_exit_cpu_hotplug(void) | |
3929 | { | |
3930 | lttng_rb_set_hp_online(0); | |
3931 | cpuhp_remove_multi_state(lttng_hp_online); | |
3932 | lttng_rb_set_hp_prepare(0); | |
3933 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3934 | } | |
3935 | ||
1ee63d8d | 3936 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3937 | static int lttng_init_cpu_hotplug(void) |
3938 | { | |
3939 | return 0; | |
3940 | } | |
3941 | static void lttng_exit_cpu_hotplug(void) | |
3942 | { | |
3943 | } | |
1ee63d8d | 3944 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3945 | |
3946 | ||
a90917c3 | 3947 | static int __init lttng_events_init(void) |
4e3c1b9b | 3948 | { |
1c25284c MD |
3949 | int ret; |
3950 | ||
453b2495 JD |
3951 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3952 | if (ret) | |
3953 | return ret; | |
389d7070 | 3954 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3955 | if (ret) |
3956 | return ret; | |
3957 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3958 | if (ret) |
3959 | return ret; | |
3960 | ret = lttng_probes_init(); | |
389d7070 MD |
3961 | if (ret) |
3962 | return ret; | |
07dfc1d0 | 3963 | ret = lttng_context_init(); |
20591cf7 MD |
3964 | if (ret) |
3965 | return ret; | |
07dfc1d0 MD |
3966 | ret = lttng_tracepoint_init(); |
3967 | if (ret) | |
3968 | goto error_tp; | |
a90917c3 | 3969 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3970 | if (!event_cache) { |
3971 | ret = -ENOMEM; | |
dffef45d FD |
3972 | goto error_kmem_event; |
3973 | } | |
3974 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
3975 | if (!event_notifier_cache) { | |
3976 | ret = -ENOMEM; | |
3977 | goto error_kmem_event_notifier; | |
20591cf7 | 3978 | } |
80996790 | 3979 | ret = lttng_abi_init(); |
02119ee5 MD |
3980 | if (ret) |
3981 | goto error_abi; | |
0c956676 MD |
3982 | ret = lttng_logger_init(); |
3983 | if (ret) | |
3984 | goto error_logger; | |
1e367326 MD |
3985 | ret = lttng_init_cpu_hotplug(); |
3986 | if (ret) | |
3987 | goto error_hotplug; | |
101215b7 | 3988 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3989 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3990 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3991 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3992 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3993 | LTTNG_VERSION_NAME, |
3994 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3995 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3996 | #else | |
3997 | "", | |
3998 | #endif | |
3999 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4000 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4001 | #else | |
4002 | ""); | |
4003 | #endif | |
4e3c1b9b | 4004 | return 0; |
0c956676 | 4005 | |
1e367326 MD |
4006 | error_hotplug: |
4007 | lttng_logger_exit(); | |
0c956676 MD |
4008 | error_logger: |
4009 | lttng_abi_exit(); | |
02119ee5 | 4010 | error_abi: |
dffef45d FD |
4011 | kmem_cache_destroy(event_notifier_cache); |
4012 | error_kmem_event_notifier: | |
1c25284c | 4013 | kmem_cache_destroy(event_cache); |
dffef45d | 4014 | error_kmem_event: |
20591cf7 | 4015 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4016 | error_tp: |
4017 | lttng_context_exit(); | |
101215b7 | 4018 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4019 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4020 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4021 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4022 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4023 | LTTNG_VERSION_NAME, |
4024 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4025 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4026 | #else | |
4027 | "", | |
4028 | #endif | |
4029 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4030 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4031 | #else | |
4032 | ""); | |
4033 | #endif | |
1c25284c | 4034 | return ret; |
4e3c1b9b MD |
4035 | } |
4036 | ||
a90917c3 | 4037 | module_init(lttng_events_init); |
11b5a3c2 | 4038 | |
a90917c3 | 4039 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4040 | { |
a90917c3 | 4041 | struct lttng_session *session, *tmpsession; |
92e94819 | 4042 | |
1e367326 | 4043 | lttng_exit_cpu_hotplug(); |
0c956676 | 4044 | lttng_logger_exit(); |
80996790 | 4045 | lttng_abi_exit(); |
92e94819 | 4046 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4047 | lttng_session_destroy(session); |
11b5a3c2 | 4048 | kmem_cache_destroy(event_cache); |
dffef45d | 4049 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4050 | lttng_tracepoint_exit(); |
07dfc1d0 | 4051 | lttng_context_exit(); |
101215b7 | 4052 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4053 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4054 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4055 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4056 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4057 | LTTNG_VERSION_NAME, |
4058 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4059 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4060 | #else | |
4061 | "", | |
4062 | #endif | |
4063 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4064 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4065 | #else | |
4066 | ""); | |
4067 | #endif | |
4e3c1b9b | 4068 | } |
92e94819 | 4069 | |
a90917c3 | 4070 | module_exit(lttng_events_exit); |
11b5a3c2 | 4071 | |
7ca11e77 | 4072 | #include <generated/patches.h> |
101215b7 MJ |
4073 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4074 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4075 | #endif | |
4076 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4077 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4078 | #endif | |
92e94819 MD |
4079 | MODULE_LICENSE("GPL and additional rights"); |
4080 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4081 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4082 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4083 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4084 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4085 | LTTNG_MODULES_EXTRAVERSION); |