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